JPH06299539A - Creation of solidified soil - Google Patents

Abstract

PURPOSE:To appropriately keep the excavating speed and the delivery rate of a binder in accordance with the state in the depth direction of ground and appropriately keep the lifting speed and the delivery rate of the binder on raising up by automatic control, both in the prior excavating process and the posterior excavating process. CONSTITUTION:The excavating speed of a rotary shaft 2 and the injection volume of a binder at the excavating time of the prior excavating process are automatically controlled according to the depth-directional state of the ground 3. And the lifting speed of the rotary shaft 2 and the injection volume of the binder at the lifting time in the prior excavating process is automatically controlled. And the lifting speed of the rotary shaft 2 and the infection volume of the binder at the excavating time in the posterior excavating process are automatically controlled in accordance with the depth-directional state of the ground 3. And the lifting speed of the rotary shaft 2 and the injection volume of the binder at the lifting time in the posterior excavating process are automatically controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a soil retaining wall, a water blocking wall, a foundation pile on the ground, or a method for forming a soil solidified body on the ground for improving the ground.

[0002]

2. Description of the Related Art Conventionally, a rotary shaft provided with a stirring means and a means for ejecting a solidifying material is used to excavate the ground and a solidifying material such as cement milk is ejected while the excavated soil and the solidifying material are agitated by the agitating means. After stirring and mixing, and after excavating to a predetermined depth, spouting the solidifying material while pulling up the rotating shaft to create a soil solidified body and form a mountain stop wall, water blocking wall, foundation pile, or ground improvement. Is known to do.

[0003] Conventionally, in order to construct a soil solidified body as described above, an operator who operates a device such as an excavator and kneader has a construction depth displayed on each display device and a vertical movement speed of a rotary shaft. While visually confirming the current and power of the equipment, the suspension load of the rotating shaft, the discharge amount of the solidifying material such as cement milk, etc., the operator can manually operate the rotating shaft ascending / descending speed and cement milk. The amount of solidified material ejected is adjusted. Further, when pulling up the rotary shaft, it is necessary to clean and remove the mixture of the excavated earth and sand adhered to the rod of the rotary shaft or the stirring means provided on the rotary shaft, and for example, spraying pressure water. It removes the mixture of excavated soil and solids adhering to the rod of the rotary shaft or the stirring means provided on the rotary shaft, but the operator manually adjusts the pulling speed while watching the state of the rotary shaft. In addition, the discharge amount of the solidified material when pulling up was manually adjusted. Further, in the past, for example, JP-A-56-289 was used.
As known from Japanese Patent No. 38, etc., the ground is excavated by three or more rotary shafts arranged side by side in a row, and the solid material is ejected from the lower end portion of the rotary shaft while excavating earth and sand and the solid material. Is stirred and mixed by a stirring means provided on the rotary shaft, and after advancing to a predetermined depth, the rotary shaft is pulled up while ejecting the solidifying material, and the mixture of the excavated soil and the solid material adhered to the rotary shaft when the rotary shaft is pulled up. Is removed by an excluding means on the ground to form a preceding hole filled with the mixture in the ground, leaving another uncut portion on the extension line of this preceding hole to form another preceding hole filled with the mixture. Next, the rotary shafts on both sides are respectively inserted into the end portions of the adjacent preceding holes, the undigged portion is excavated by the central rotary shaft, and the excavating sediment and the solidifying material are agitated while injecting the solidifying material. Stir and mix with a predetermined depth After digging in, the rotary shaft is pulled up while injecting the solidifying material, and the mixture of the excavated soil and solidifying material adhering to the rotary shaft is removed by the excluding means on the ground. A method is known in which a row solid hole is formed so that a preceding hole and a trailing hole are continuous with each other and a mixture is filled in the inside of the soil solidified body.

[0004]

However, in the prior art, the operator manually adjusts the ascending / descending speed of the rotating shaft and the ejection amount of the solidifying material such as cement milk as described above. Therefore, the accuracy of the soil solidified body to be created is largely influenced by the skill of the operator, and even an operator with excellent skill may cause a malfunction due to operation delay, oversight, or misunderstanding.
For this reason, in consideration of safety, the injection amount of the solidifying material is increased and injected both during the excavation and during the pulling up, which causes an increase in the amount of the solidifying material to be uneconomical. . Further, there is also a problem that the excavation speed and the pulling speed of the rotary shaft tend to be generally slow and the construction time becomes long.

Further, in the conventional example in which a soil solidified body is formed while performing the preceding digging and the trailing digging, which is known from Japanese Patent Laid-Open No. 56-28938, etc., the digging speed of the leading digging and the trailing digging and The pulling speed and the amount of solidifying material supplied are set manually based on the feeling of the operator. There was a problem that the amount of the solidifying material supplied increased and it became uneconomical.

The present invention has been made in view of the above-mentioned problems of the conventional example, and an object of the present invention is to determine the advancing speed and the consolidating material in the preceding excavation process according to the state of the ground in the depth direction. It keeps the discharge amount at the time of digging proper and the pulling speed at the time of pulling up in the preceding digging process and the discharge amount at the time of pulling up the solidifying material to be proper, and further, the digging speed in the subsequent digging process and the discharge amount at the time of digging in the solidifying material. In addition to properly maintaining the above, the pulling speed at the time of pulling up in the subsequent digging process and the discharge amount of the solidifying material at the time of pulling up are appropriately maintained, and a good quality soil solidified body with continuous leading holes and trailing holes is automatically controlled. It is to provide a method for forming a soil solidified body that can be manufactured.

[0007]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, the method for forming a soil-solidified body of the present invention is a three-axis system in which one row is arranged side by side. While excavating the ground 3 by the rotating shaft 2 and ejecting the solidifying material, the excavated soil and the solidifying material are agitated and mixed by the stirring means 1 provided on the rotating shaft 2, and after advancing to a predetermined depth, the solidifying material is removed. The rotary shaft 2 is pulled up while jetting, and the mixture of the excavated soil and the solidified material adhering to the rotary shaft 2 when the rotary shaft 2 is pulled up is removed by the removing means 30 on the ground, and the ground 3 is filled with the mixture. Forming the leading hole 31
Another preceding hole 31 filled with the mixture is formed by leaving the uncut portion 33 on the extension line of the preceding hole 31, and then the rotary shafts 2 on both sides are respectively inserted into the ends of the adjacent preceding holes 31. While excavating the uncut portion 33 by the central rotating shaft 2 and injecting the solidifying material, the excavated soil and the solidifying material are stirred and mixed by the agitating means 1, and the solidifying material is injected after excavating to a predetermined depth. While pulling up the rotary shaft 2 while
By removing the mixture of the excavated sand and the solidified material adhering to the ground by the removing means 30 on the ground, the trailing hole 32 filled with the mixture in the ground 3 is formed to form the preceding hole 31.
In the method for forming a soil solidified body in which the following holes 32 are continuous and the mixture is filled with the mixture, when the rotary shaft 2 is dug in the preceding digging step of forming the preceding holes 31, the target ground 3 Based on the data of the soil 3 in the depth direction obtained in advance from the soil survey results, the depth direction is divided into a plurality of divisions, and the excavation speed of the rotary shaft 2 and the division for each division based on the data of this division Control means 2 so that the injection amount of the solidifying material per unit time according to the digging speed is set.
0, and when the rotary shaft 2 is pulled up in the preceding digging step, the stirring means 1 of the rotary shaft 2 is pulled up.
Is slow when passing the exclusion position by the exclusion means 30 on the ground, and is fast when only the rod 2a portion of the rotating shaft 2 not provided with the stirring means 1 passes the exclusion position by the exclusion means 30 on the ground. Depending on the type of the rotating shaft 2 used, the pulling speed of the rotating shaft 2 is automatically changed depending on whether or not the stirring means 1 is passing through the exclusion position, and the solidification per unit time corresponding to the pulling speed is performed. The control means 20 automatically controls the injection amount at the time of pulling up the material to form the trailing hole 32. In the process of the following digging process, each section in the depth direction is deeper than the process of the preceding digging process. The automatic control is performed by the control means 20 so as to increase the digging speed in the above and to reduce the injection amount of the solidifying material per unit time during the digging according to the digging speed for each section. When pulling up the rotating shaft 2 in the digging step, when the stirring means 1 of the rotating shaft 2 passes the exclusion position, it is faster and only the rod 2a portion is faster than when the stirring means 1 in the preceding digging step passes the exclusion position. When passing the exclusion position, only the rod 2a portion in the preceding digging step is automatically changed so as to have almost the same speed as when passing the exclusion position, and the solid material is injected at the time of pulling up corresponding to the pulling speed. It is characterized by being automatically controlled by the control means 20 so as to automatically change the amount.

The leading hole 31 and the trailing hole 32 are preferably formed in a beaded shape.

[0009]

According to the present invention, first, the depth direction is divided into a plurality of sections based on the data of the ground direction 3 in the depth direction obtained in advance from the soil investigation of the target ground 3. In order to divide the ground 3 into a plurality of sections in the depth direction, a section is prepared for each range in which uniform excavation speed of the rotary shaft 2 and jetting of the hardening material for forming a desired soil solidified body are possible. To divide. Then, the digging speed of the rotary shaft 2 in the preceding digging process is set for each of the sections thus divided in the depth direction, and the injection amount of solidifying material per unit time according to the digging speed of the section is set. To do. In addition, the digging speed of the rotary shaft 2 in the following digging step of digging the undigged portion 33 for each of the above-mentioned sections is set, and the injection amount of the solidifying material during digging per unit time according to the digging speed for each of the sections is set. Set. In this case, since the rotary shafts 2 on both sides are inserted into the end portions of the preceding holes 31 formed in the preceding excavation step in the subsequent excavation step, only the unexposed section 33 is excavated by the same excavator. The digging speed in each section in the depth direction in the following digging is set so that the digging is performed at a higher digging speed than that in the digging of the preceding digging. Then, by inputting this data, according to the state of the ground 3 based on the input data, the excavation speed and the solidifying material for each section of the ground 3 by the rotary shaft 2 in the preceding digging process and the following digging process The control means 20 automatically controls the injection amount per unit time according to the excavation speed. Further, at the time of pulling up in the preceding digging process, it is slow when the stirring means 1 of the rotating shaft 2 passes the position where the stirring means 1 on the ground is excluded by the discharging means 30, and only the rod 2a portion where the stirring means 1 of the rotating shaft 2 is not provided is grounded. The speed of pulling up each part in the vertical direction of the rotary shaft 2 is preset according to the type of the rotary shaft 2 to be used so that it will be faster when passing through the exclusion position by the removing means 30 in (1). When setting the injection amount at the time of pulling up the solidifying material per unit time, and when pulling up the rotary shaft 2 in the following drilling process,
The rotating shafts 2 on both sides are less adhering to the mixture, especially the excavated earth and sand, than the rotating shafts 2 which contributed to the excavation of the uncut portion 33 at the center. It is faster than when the stirring means 1 passes the exclusion position in the digging process, and when only the rod 2a part passes the exclusion position, the speed is almost the same as when only the rod 2a part passes the exclusion position in the preceding digging process. As described above, the data obtained according to the type of the rotary shaft 2 is input, and the pulling speed of the rotary shaft 2 at each pulling up in the preceding digging process and the following digging process is automatically controlled based on this data. Therefore, the leading digger corresponding to the type of the rotary shaft 2 is cleaned while cleaning the mixture adhering to the rotary shaft 2 at the time of pulling up in both the preceding digging process and the trailing digging process. And thereby making it possible to increase while securing the pulling time of ejection of the optimum pull rate and consolidated material in the succeeding digging process.

When the leading hole 31 and the trailing hole 32 are formed in a beaded shape, the rotating shafts 2 on both sides are inserted into the ends of the leading holes 31 adjacent to each other to form the trailing hole 32, and the central rotation is performed. When excavating the uncut portion by the shaft, the rotary shafts 2 on both sides are inserted into the end portions of the adjoining preceding holes 31 having a substantially circular cross section, and the trailing hole 32 is prevented in a state where displacement is prevented.
Can be excavated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows a block diagram of an example of an apparatus used in the present invention. This device is composed of an excavator-kneader 4 and a solidifying material plant 5. The excavating and kneading machine 4 is constructed by attaching a rotary shaft 2 along a leader 6 so as to be vertically movable. A bit 7 is provided at the lower end of the rotary shaft 2, and an injection port for injecting the solidified material downward is provided near the lower end of the bit 7 or the rotary shaft 1, and the rotary shaft is also provided. A stirring means 1 such as a stirring blade 1a and a screw 1b is formed at an arbitrary position in the longitudinal direction of 2. In the present excavating and kneading machine 4, three or more rotating shafts 2 are arranged in a row laterally in a multi-axis manner (Fig. 1 shows a side view of the apparatus, so only one rotating shaft 2 is visible). However, when viewed from the front, a plurality of rotating shafts 2 are arranged side by side as shown in FIG. 4 and the like). In FIG. 1, 8 is a multi-axis device, 9 is a rotating device such as an electric motor, and by rotating the rotating device 9, a plurality of rotating shafts 2 are rotated through the multi-axis device 8. There is. Further, the rotating device 9 is provided on the elevating body 10, and the elevating body 10 is hung by the wire 11 so as to move up and down along the reader 6. By elevating the elevating body 10, the rotary shaft 2 is rotated. It moves up and down along. Further, the rotary shaft 2 is detachable regardless of whether it is a single shaft or a multi-shaft, and can be replaced with various forms of the rotary shaft 2. FIG. 4 shows each example of the type of the rotary shaft 1, but the present invention is not necessarily limited to this example.

The solidifying material plant 5 is for preparing solidifying material such as cement milk, a mixed liquid mainly composed of cement milk, and other chemical materials. Is provided with a pump 12 for pumping the solidifying material, and the solidifying material pumped from the pump 12 is sent to the excavator kneading machine 4 by the supply hose 13 and jetted from the jet port provided on the rotary shaft 2. It is like this. Reference numeral 14 in the figure is an agitator for producing a consolidating material.

The device of the present invention is equipped with various detection means for collecting various data during operation. Excavation kneader 4
The depth meter 15 and the load meter 16 are attached to the reader 6 of the rotary shaft 2.
Is provided so that the depth of the bit 7 provided at the lower end of the rotary shaft 2 and the load on the rotary shaft 2 can be measured.
A distribution board 29 for a rotating device 9 such as an electric motor for rotating the rotary shaft 2 is provided in the excavating and kneading machine 4, and the distribution board 29 is provided with an ammeter 17 and a power meter 18. Further, a supply hose 13 for supplying the solidified material to the rotary shaft 2.
A flow meter 19 for measuring the flow rate of the solidifying material is provided in the middle of.

As shown in the figure, the control means 20 is connected to the above-mentioned respective detection means, and further, a display and setting operation section 21, a recording and reading section 22, an output terminal for raising and lowering operation signals of the rotary shaft 2, And an output terminal connected to the pump control unit 23 installed in the solidifying material plant 5 and a recorder (analog recorder) 24 for recording the output.

In the display and setting operation section 21, various data can be manually input and the data can be manually deleted, and various displays can be displayed. It has become. That is, the depth direction is divided into a plurality of sections based on the data of the ground 3 in the depth direction obtained in advance from the soil survey result of the target ground 3 performed in advance, and this data is displayed on the display and setting operation unit 21. input. Further, when the stirring means 1 of the rotating shaft 2 passes through the exclusion position by the excluding means 30 on the ground when the rotating shaft 2 is pulled up, it is slow and only the rod 2a portion of the rotating shaft 2 where the stirring means 1 is not provided is on the ground. The speed of pulling up the rotary shaft 2 for each type of the multiple rotary shafts 2 to be used so as to be faster when passing through the exclusion position by the exclusion means 30, and the consolidation per unit pulling length according to the speed of pulling up. The injection amount at the time of pulling up the material is obtained, and the data of the rotary shaft 2 used in the target ground 3 is input. Then, based on the input data, in the present invention, the control means 20 automatically controls the excavation speed of the rotary shaft 2 and the injection amount of the solidifying material during the excavation according to the depth direction division of the target ground 3. In addition, the pulling speed according to the type of the rotary shaft 2 at the time of pulling up and the injection amount of the solidifying material at the time of pulling up are automatically controlled. The above-described data is obtained for each of the divisions in the depth direction of the rotary shaft 2 or for each type of the rotary shaft 2 in the case of the following digging process and the case of the following digging process, respectively. Enter it as digging data. Based on the input data, the control means 20 according to the present invention.
Thereby automatically controlling the digging speed of the rotary shaft 2 during the digging process of the preceding digging process and the injection amount of the solidifying material during the digging process per unit time according to the digging speed, and the rotating shaft during the pulling up of the preceding digging process. The pulling speed according to the two types,
The injection amount of the solidifying material per unit time according to the pulling speed is automatically controlled, and the digging speed of the rotary shaft 2 during the digging process in the subsequent digging process and the lumping speed per unit time according to the digging speed are controlled. Automatically control the injection amount of binder when digging,
The pulling rate according to the type of the rotary shaft 2 at the time of pulling up in the subsequent digging step and the injection amount of the solidifying material at the time of pulling up per unit time according to the pulling rate are automatically controlled.

The recording / reading unit 22 is provided with a 1C card 25 and a printer 26 for recording the detection means and recording settings. In addition to the manual input, the IC card 25 is used for the recording and reading unit 22.
It is also possible to read various data and input. Further, the solidifying material plant 5 receives a signal from the control means 20 through the signal line 27 or wirelessly during the digging, a solidifying material pressure feed amount signal per unit time set for each of the current depth and the division depth. Alternatively, at the time of pulling up, the solid material pressure feed amount signal per unit time depending on the current depth and whether the stirring means 1 is located at the position to be cleaned by the removing means 30 on the ground is received, and the received contents are displayed and received. A pump control unit 23 that controls the pumping amount of the pump 12 by the pumping amount signal is provided, and whether or not the received content of the pump control unit 23 is electrically valid, and whether or not the consolidation material pumping is based on the received pumping amount signal is manually adjusted. Agitator 14 in the solidifying material plant 5
A status display unit 28 is connected so that it can be identified from a distant point whether or not is empty.

The pumping amount of the solidifying material per unit time during the advance of the rotary shaft 2 in the preceding digging step is such that all the rotary shafts 2 excavate the ground 3 to advance, so that the rotary shafts 2 are excavated. The amount of injection per unit length of excavation is set so as to be automatically changed according to the excavation speed of the rotary shaft 2 according to the excavated earth and sand. That is, when the excavation speed of the rotary shaft 2 changes, the injection amount of the solidifying material automatically changes in response to the change. Further, the pumping amount of the solidified material per unit time at the time of pulling up the rotary shaft 2 in the preceding process is set to automatically change based on the injection amount per unit time according to the pulling rate. .

On the other hand, the amount of pressure-bonding of the solidifying material per unit time when the rotary shaft 2 is advanced in the subsequent digging process is determined by the preceding digging process in which the rotary shafts 2 on both sides are filled with the uncured mixture. Since it is inserted into the end portion of the preceding hole 31, in reality, only the unexposed portion 33 is excavated by the rotating shaft 2 in the central portion of the plurality of rotating shafts 2 and the unexposed portion 33 is left.
Since it is only necessary to supply the amount of solidifying material required to mix with the excavated earth and sand of the above, it is necessary to set the amount of solidifying material to be less than the amount of solidifying material to be sent per unit time during the excavation of the preceding excavation process. , So that the optimum injection amount per unit time according to the excavation speed of each section excavated by the central rotating shaft 2 is automatically changed according to the excavation speed of each section of the rotating shaft 2. Is set to.

Here, as described above, the excavation speed of the rotary shaft 2 during the excavation of the preceding excavation process is such that the soil 3 in the depth direction obtained in advance from the soil survey result of the target soil 3 performed in advance. The depth direction is divided into a plurality of sections on the basis of the data of, and the excavation speed of the rotary shaft 2 when excavating and excavating each section by all the rotary shafts 2 for each of the sections is calculated. The digging speed of the rotary shaft 2 at the time of digging in the digging process is divided into a plurality of sections in the depth direction based on the data of the ground 3 in the depth direction obtained in advance from the soil survey result of the target ground 3 performed in advance above. The division is performed, and the excavation speed of the rotary shaft 2 when the excavation is performed while excavating the unexcavated portion 33 by the rotary shaft 2 at the central portion is performed. In this case, the preceding excavation step,
In any case of the subsequent digging process, the ground 3 generally has different N values (hardness) and soil properties (cohesive soil, sandy soil, etc.) in the depth direction, so the soil 3 in these depth directions is different. The state change is divided into a plurality of sections in the depth direction, and an optimum excavation speed at the time of excavation in the preceding excavation process by all the rotary shafts 2 of the multi-axis in the excavating and kneading machine 4 used according to each section is obtained, and each section is also determined. Therefore, the optimum advancing speed at the time of excavation in the trailing excavation process by the central rotating shaft 2 in the excavating and kneading machine 4 used according to is determined. In this case, in order to divide the target ground 3 into a plurality of depth directions, for example, a case in which various factors such as N value (hardness) and soil properties (cohesive soil, sandy soil, etc.) are taken into consideration, and N value (hardness) In some cases, only the above is taken into consideration. In any case, the depth direction hardness of the ground 3 is obtained as a main element in order to divide the depth direction during the excavation. If the N value is small, the excavation speed is high.
If the N value is large, the excavation speed is slowed.

In the preceding digging process and the following digging process, the pumping amount of the solidifying material per unit time at the time of pulling up the rotary shaft 2 is based on the injection amount per unit pulling length, and the pulling speed of the rotary shaft 2 is When the amount changes, the injection amount of the solidifying material is set so as to automatically change accordingly. In this case, the injection amount of the solidified material at the time of pulling up the solidified material is equal to
It is almost the same as the volume corresponding to the unit pull-up length. That is, when the rotary shaft 2 is pulled up by the unit pull-up length, the volume of the rotary shaft 2 pulled up at the same time is compensated by injecting the solidifying material, and this is the injection amount during pulling up.

Further, the pulling speed of the rotary shaft 2 in the preceding step is slow as described above when the agitating means 1 of the rotary shaft 2 passes through the removing position by the removing means 30 on the ground when the rotary shaft 2 is pulled up. The pulling speed is determined according to the type of the rotating shaft 2 to be used so that only the rod 2a portion of the rotating shaft 2 not provided with the stirring means 1 passes through the removing position by the removing means 30 on the ground. is there. Here, the excluding means 30 is, for example, an excavator attached to the rod 2a portion of the rotary shaft 2 and the stirring means 1 provided on the rotary shaft 2 by pressurizing and jetting water, air, or the like onto the rotary shaft 2 that is pulled up. A mixture of earth and sand and a solidifying material is washed away, or a mixture of excavated earth and sand and a solidifying material attached to the rod 2a portion of the rotating shaft 2 and the stirring means 1 provided on the rotating shaft 2 by a brush on the ground. There are various possible means, such as the one to remove the
In any case, when the mixture of the excavated soil and the solidifying material is removed on the ground, the mixture adhering to the stirring means 1 of the rotary shaft 2 may be removed by cleaning only the rod 2a portion of the rotary shaft 2. Since it takes longer time than when the adhering mixture is removed by cleaning, the stirring means 1 of the rotating shaft 2 passes through the removing position by the removing means 30 on the ground when the rotating shaft 2 is pulled up as shown in FIG. 2A. Time is late and
As shown in FIG. 2B, when only the rod 2a portion of the rotating shaft 2 where the stirring means 1 is not provided passes through the exclusion position by the exclusion means 30 on the ground, the speed is increased. The pulling speed of the shaft 2 is obtained in advance according to the type of the rotary shaft 2. Then, for example, the depth of the rotary shaft 2 at the time of pulling up is obtained by the depth gauge 10 to remove the means 30 on the ground.
As a result, it is determined whether the stirring means 1 is located at the position where the mixture is removed or only the rod 2a is located. Therefore, the pulling rate is controlled based on the depth data of the rotary shaft 2. By the way, the excluding means 30 may be installed in the excavating and kneading machine 4, but the excluding means 30
The operator may remove the mixture by holding the nozzle for injecting water or air, which constitutes the above, in his hand. When the operator holds the mixture in this way to remove the mixture, the removal position by the removal means 30 on the ground is set to about 1 m from the ground.

If there is a noticeable difference in the removal time of the mixture due to the difference in the type of the stirring means 1 (for example, the stirring blade 1a, the screw 1b, or the difference in their shapes), the stirring is performed. The pulling rate may be further changed according to the difference of the means 1. On the other hand, the pulling-up speed of the rotary shaft 2 in the following excavation process is slow when the stirring means 1 of the rotary shaft 2 passes the exclusion position by the excluding means 30 on the ground when the rotary shaft 2 is pulled up, and the stirring means of the rotary shaft 2 is also slow. The pulling speed is determined according to the type of the rotating shaft 2 to be used so that it is faster when only the rod 2a portion not provided with 1 passes through the exclusion position by the exclusion means 30 on the ground. In addition to this, Further, when the rotary shaft 2 is pulled up in the subsequent digging process, the rotary shafts 2 on both sides are less adhering to the mixture, especially the excavated soil, as compared with the rotary shaft 2 that contributed to the excavation of the uncut portion 33 at the center.
When the stirring means 1 of the rotating shaft 2 passes the exclusion position, it is faster than when the stirring means 1 passes the exclusion position in the preceding excavation step, and when only the rod 2a part passes the exclusion position, the rod in the preceding excavation step. The speed is determined according to the type of the rotary shaft 2 so that only the portion 2a has the same speed as when passing the exclusion position.

Therefore, in the present invention, first, the soil investigation of the target ground 3 is conducted in advance, and the data of the soil 3 in the depth direction obtained in advance from the soil investigation result of the target soil 3 conducted in advance. Based on, the depth direction is divided into a plurality of sections. Then, the data of the divided sections are input to the display and setting operation unit 21, and the data of the rotating shaft 2 to be used (the number of rotating shafts 2 and the stirring means 1 are provided at any position in the vertical direction of the rotating shaft 2). Data such as whether there is any)
Is input to the display and setting operation unit 21. After inputting these data, the excavation and kneading machine 4 is used to excavate the ground 3 in advance,
While digging backwards, a soil solid body that is continuous in the lateral direction is created.

That is, an example of construction will be described with respect to an example in which the rotary shaft 2 is three axes. First, as the preceding excavation step, the rotary shaft 2 is used to excavate the target ground 3 and the solid material is ejected while excavating earth and sand. The stirrer and the solidifying material are agitated and mixed by the stirrer 1, and after advancing to a predetermined depth, the rotating shaft 2 is pulled up while ejecting the solidifying material, and the excavated earth and sand and the solidifying material attached to the rotating shaft 2 when the rotating shaft 2 is pulled up. By removing the mixture of and by the removing means 30 on the ground, the preceding hole 31 filled with the mixture is formed in the ground 3 (see FIG. 5 (a)). In this case, in the advancement and pulling up of the preceding excavation process, the advancement of the solidified material per unit time in accordance with the advancement speed of the rotary shaft 2 and the advancement speed of each section according to the depth direction state of the ground at the time of advancement It is automatically controlled by the control means 20 so as to inject the hourly injection amount, and the pulling speed of the rotating shaft 2 is adjusted according to the rotating shaft 2 being used when the stirring means 1 is passing through the exclusion position. It is automatically controlled by the control means 20 so as to automatically change the injection amount of the solidifying material at the time of pulling up per unit time according to the pulling speed. Next, another preceding hole 31 filled with the mixture is formed by leaving the uncut portion 33 on the extension line of the preceding hole 31 (see FIG. 5 (b)), and then the end of the adjacent preceding holes 31 is formed. Insert the rotary shafts 2 on both sides into the parts,
Using the rotary shafts 2 on both sides as guides, the undigged portion 33 is excavated by the central rotary shaft 2 and the excavated soil and the solidified material are stirred and mixed by the stirring means 1 while injecting the solidified material,
After excavating to a predetermined depth, the rotary shaft 2 is pulled up while injecting the solidifying material, and the mixture of the excavated soil and the solidifying material attached to the rotary shaft 2 is removed by the removing means 30 on the ground to the ground 3. Trailing hole 3 filled with mixture
By forming 2, the leading hole 31 and the trailing hole 32 are continuous to form a soil solidified body in which the mixture is filled (see FIG. 5 (c)). In this case, in the following digging process of the digging process, in raising, the digging speed in each section in the depth direction is made faster than the digging of the preceding digging process, and per unit time of the solidifying material corresponding to the digging speed of each section. The automatic control is performed by the control means so as to reduce the injection amount at the time of the digging, and when the rotating shaft 2 is pulled up in the following digging process, the preceding digging process is performed when the stirring means 1 of the rotating shaft 2 passes the exclusion position. Is faster than when the agitating means 1 passes the exclusion position, and when only the rod 2a portion passes the exclusion position, the rod 2a in the preceding digging step
The control means 20 automatically changes the speed so that the speed is almost the same as when only the portion passes the exclusion position, and automatically changes the injection amount of the solidifying material at the time of pulling up corresponding to the pulling speed. It is automatically controlled. In the present invention, the minimum unit is as shown in FIG.
Although it is possible to create a soil body continuous in the lateral direction up to the state of FIG.
After (c), the construction is carried out one after another in the order of FIG. 5 (d), FIG. 5 (e) ... Here, in the case of performing the preceding digging with the uncut portion 33 left in the preceding digging step, three or more preceding holes 31 are preliminarily formed on the straight line via the uncut portion 33, and then the remaining digging is performed. The trailing hole 32 may be formed by sequentially trailing the remaining portion 33. Further, in the present invention, the unit holes such as the leading hole 31 and the trailing hole 32 that are excavated by three or more rotary shafts 2 may be such that adjacent unit holes partially overlap each other as shown in FIG. Alternatively, as shown in FIG. 6, the unit holes adjacent to each other may be almost in contact with each other. When the leading hole 31 and the trailing hole 32 are formed in a beaded shape as shown in FIGS. 5 and 6, the rotary shafts 2 on both sides are inserted into the ends of the leading holes 31 adjacent to each other to form the trailing hole 32. Then, when excavating the undigged portion with the central rotating shaft, the rotating shafts 2 on both sides are inserted into the portions having the substantially circular cross section of the end portions of the adjoining preceding holes 31, and the positional deviation is prevented. The trailing hole 32 can be excavated.

In addition to the automatic control at the time of advancement and the automatic control at the time of pulling up in the preceding digging process and the following digging process, further re-stirring of the excavated soil and the solidifying material is performed automatically. Good. That is, based on the data of the ground 3 obtained in advance from the soil investigation result of the target ground 3, the rotary shaft 2 rotates while moving up and down during the excavation to a predetermined depth in the preceding digging process and the following digging process. Or, by rotating without moving up and down, re-stirring is performed during excavation, or while moving the rotating shaft 2 up and down after excavating to a predetermined depth and before pulling up. To rotate, or to rotate without moving up and down,
Alternatively, during the pulling up process, the control means 20 automatically controls the rotating shaft 2 such that the rotating shaft 2 is rotated while moving up and down, or the vertical movement is stopped and then rotated to re-stir. In particular, in this re-stirring, the re-stirring is performed by rotating while rotating up and down after the rotary shaft 2 has advanced to a predetermined depth and before pulling up, in both the preceding digging step and the following digging step. Is preferably performed. Depending on the ground 3, gravel or the like is likely to accumulate at the bottom, and it is preferable to raise this to a certain degree and re-stir, or when the rotary shaft 2 is dug and pulled up, the rotary shaft 2 is positioned. Since the bottom time is the shortest, it is effective when the bottom part needs to be re-stirred. When the rotating shaft 2 is moved up and down during re-stirring, it is set to 10 m or less, preferably about 1 to 5 m, but the up and down moving distance of these is set depending on the condition of the ground, depth, and the like. Here, in the case of re-stirring, the solidifying material is re-stirred while ejecting a minimum required amount or more. When re-stirring, the minimum required amount of solidifying material is that the mixture of uncured excavated earth and solidifying material filled in the excavation hole does not flow backward from the injection port for injecting the solidifying material. The solidified material is injected at a constant injection pressure or higher, and the minimum injection amount required to prevent backflow from the injection port is obtained as the minimum required injection amount during re-stirring. . Then, the set injection amount equal to or larger than the minimum required amount is automatically controlled and injected by the control means 20 at the time of re-stirring.

[0026]

As described above, according to the present invention, when the rotary shaft is dug in the preceding digging step in the preceding digging step, the soil in the depth direction obtained in advance from the soil survey result of the target ground is obtained. The depth direction is divided into multiple sections based on the data of the section, and the solid material per unit time is injected at the time of excavation corresponding to the excavation speed of the rotation axis and the excavation speed of each section based on the data of this section. When the rotary shaft is pulled up in the preceding digging process, it is slow when the stirring means of the rotary shaft passes the exclusion position by the exclusion means on the ground when the rotary shaft is pulled up, and Depending on the type of the rotating shaft used, the stirring means may increase the speed of the stirring shaft so that only the rod part that does not have the stirring device passes through the position where it is excluded by the discharging device on the ground. It is automatically controlled by the control means so that it automatically changes depending on whether or not it is passing the removal position and the injection amount of the solidifying material per unit time at the time of pulling up corresponding to the pulling speed is automatically changed. However, in the digging process of the subsequent digging process, the digging speed in each section in the depth direction is made faster than the digging of the preceding digging process, and the injection amount of the solidifying material corresponding to the digging speed of each section is reduced. Automatically controlled by the control means, and when the rotating shaft is pulled up in the subsequent digging step, when the stirring means of the rotating shaft passes the exclusion position compared to when the stirring means in the preceding digging process passes the exclusion position. Fast and when only the rod part passes the exclusion position, it is automatically changed so that it becomes almost the same speed as when only the rod part passes the exclusion position in the preceding excavation process. Both of them are automatically controlled by the control means so as to automatically change the injection amount of the solidifying material at the time of pulling up corresponding to the pulling speed, so that it is continuous in the lateral direction by a series of steps of the preceding digging step and the following digging step. When constructing a soil body, in each case of the leading digging process and the trailing digging process, it is optimal for the leading digging process and the trailing digging process depending on the ground condition and the type of rotating shaft to be used. It can be installed while automatically changing so that the speed and the injection amount of the solidifying material can be changed. As a result, the soil that is continuous in the lateral direction of interest can be obtained in the shortest time and with the optimum usage amount of the solidifying material. It is capable of automatically forming a solid body.

When the leading hole and the trailing hole are formed in a beaded shape, the rotary shafts on both sides are inserted into the ends of the adjacent leading holes to form the trailing hole, and the uncut portion is formed by the central rotating shaft. When excavating, the trailing hole can be accurately excavated in a state where the rotary shafts on both sides are inserted into the portions of the end portions of the adjoining preceding holes which are substantially circular in cross section to prevent misalignment.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus used for a method for producing a soil consolidated body of the present invention.

FIG. 2 (a) is an explanatory view of a state in which a stirring means part is being cleaned when the above rotary shaft is pulled up, and FIG.
FIG. 7 is an explanatory view of a state in which the rod portion is being cleaned when the above rotary shaft is pulled up.

FIG. 3 is a configuration diagram of a control means of the above.

4 (a), (b), (c), and (d) are front views showing respective examples of rotating shafts used in the same.

5 (a), (b), (c), (d), and (e) are explanatory views showing a construction order of an example of the present invention.

6 (a), (b), (c), (d) and (e) are explanatory views showing a construction order of another example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirring means 2 Rotating shaft 2a Rod 3 Ground 20 Control means 30 Exclusion means 31 Leading hole 32 Trailing hole 33 Uncut portion

Claims (2)

[Claims] 1. The ground is excavated by three or more rotary shafts horizontally arranged in a row and the excavated solidifying material is agitated and mixed with the excavated soil and the solidifying material by a stirring means provided on the rotary shaft,
After excavating to a predetermined depth, the rotary shaft is pulled up while ejecting the solidifying material, and the mixture of the excavated soil and solidifying material that has adhered to the rotary shaft when pulling up the rotary shaft is removed by the removing means on the ground. To form a leading hole filled with the mixture, to leave another uncut portion on the extension line of this leading hole to form another leading hole filled with the mixture, and then to the ends of the adjacent leading holes, respectively. Insert the rotary shafts on both sides, excavate the unexposed portion with the central rotary shaft, and agitate and mix the excavated soil and the solidified material while injecting the solidified material by the stirring means, and advance to a predetermined depth before solidification. Forming a trailing hole in which the mixture is filled in the ground so that the mixture of the excavated soil and the solidified material adhering to the rotary shaft is removed by the excluding means on the ground while pulling up the rotary shaft while injecting the material In the method of forming a soil solidified body in which the leading hole and the trailing hole are continuous and the mixture is filled in the inside, when the rotary shaft is dug in the leading digging step of forming the leading hole, the soil quality of the target ground is The depth direction is divided into a plurality of sections based on the depth direction ground data obtained in advance from the survey results, and the rotation axis excavation speed for each section and the excavation speed for each section based on the data of this section are divided. Automatically controlled by the control unit so that the amount of solidified material injected per unit time during digging is raised, and when the rotary shaft is pulled up in the preceding digging process, the stirring means of the rotary shaft is removed by the eliminator on the ground at the time of pulling up. Type of rotating shaft used so that it passes slowly when passing through the position, and becomes faster when only the rod portion not provided with stirring means of the rotating shaft passes through the exclusion position by the exclusion means on the ground The speed of pulling up the rotating shaft is automatically changed depending on whether or not the stirring means is passing the exclusion position, and the injection amount of the solidifying material per unit time at the time of pulling up corresponding to the speed of pulling is automatically changed. Automatically controlled by the control means to change to
In the excavation of the trailing digging process to form the trailing hole, the digging speed in each section in the depth direction is made faster than the digging of the preceding digging step and the solidification material per unit time according to the digging speed of each section Automatically controlled by the control means so as to reduce the injection amount at the time of digging, further, when pulling up the rotating shaft in the following digging step, when the stirring means of the rotating shaft passes the exclusion position, the stirring means in the preceding digging step becomes It is faster than when passing the exclusion position, and when only the rod portion passes the exclusion position, the speed is automatically changed so that the speed is almost the same as that when only the rod portion passes the exclusion position in the preceding excavation process. A method for producing a soil solidified body, comprising automatically controlling by a control means so as to automatically change the injection amount of the solidified material at the time of pulling up corresponding to the pulling speed. 2. The method for producing a soil-solidified body according to claim 1, wherein the leading hole and the trailing hole have a beaded shape.