JPH0593418A - Development method for deformed-ground improved body - Google Patents

Abstract

PURPOSE:To make it possible to develop a deformed-ground improved body applicable to various uses by providing a plurality of injection nozzles to the front end side wall section and the front end section of a boring rod, and controlling control valves of the nozzles. CONSTITUTION:A side type injection nozzle 13, an air injection nozzle 14, a perpendicular type injection nozzle 15, etc., are provided to the front end side wall section and the front end section of a boring rod 8. Controlling valves for controlling an injection amount of hardening agent injected from those nozzles 13-15 and automatic or manual controllers 16 and 17 for controlling the controlling valves are provided. In accordance with conditions of the ground or uses of a ground improved body, injection amount, injection time, injection angle, etc., of the nozzles 3-15 are controlled, and deformation ground improved body applicable to uses is developed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a ground improvement body which is constructed for the purpose of improving soft ground, foundation of a building structure, etc., and particularly, the conditions of the ground or the use of the ground improvement body. The present invention relates to a method of providing various deformed ground improvement bodies according to the above.

[0002]

2. Description of the Related Art Conventionally, various ground improvement methods have been invented as hardening methods for soft ground. In particular, the emphasis was placed on how to efficiently create a ground improvement body. For example, there are various construction methods such as so-called single pipe, double pipe, and triple pipe by the present inventor. These improvements, including those of other inventors, are new construction methods that are reasonably good only for those that have been developed through various trials and errors. However, recently, unsolved parts have been exposed in view of the increase in the height of buildings and the increase in deep underground structures. That is, in the conventional construction method, the curing agent is only sprayed from the lower side wall of the boring rod, but as described above, it has not been possible to meet the demand due to the recent relationship with the building or the like.
This is because if the structures, etc., become high-rise, it goes without saying that in soft ground, even in an earthquake-prone country such as Japan, there will be a need to create a hard ground improvement body that is higher than before.

[0003]

Accordingly, the present inventor has provided a jet nozzle at the lower end of the rod in the apparatus for constructing a hard ground improvement body (hereinafter, referred to as another invention), which was filed concurrently with the present application. It has come to provide a tough improved body that is suitable for the recent applications of the ground improved body. But,
The invention is an improved invention in a so-called single tube,
The performance of the single tube is improved, and it is epoch-making that conventional improvement does not have,
Although it provides a tough improved body, it is still a perfect and versatile improved body for recent applications. Therefore, based on the technology of another invention related to this simultaneous application,
Furthermore, it aims at creating a modified ground improvement body adapted to ground improvement construction work in all fields.

[0004]

[Means for Solving the Problems] In order to achieve the above object,
The present invention provides a plurality of nozzles, which are hardener injection ports, and a control valve that controls the injection amount injected from the nozzles at the tip side wall portion and the tip portion of a boring rod, and an automatic or manual control device that controls the control valve. An apparatus for creating a ground improvement body having, by controlling the injection amount, injection time, or injection angle of each nozzle according to the conditions of the ground or the application of the ground improvement body, thereby forming a deformation improvement body according to the application. Provide a construction method.

[0005]

[Function] When the curing agent is injected from the side surface type injection nozzle and / or the direct type nozzle, a double tube or triple tube injection tube is used, and the curing agent injected from the side surface type injection nozzle is a unique air injection tube. It is injected while being mixed by the high-pressure air that has been injected through, and at that time, the injection amount of each nozzle is adjusted by the automatic or manual control device on the ground, depending on the application of the ground improvement body. The injection time or injection angle can be controlled.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 shows a first embodiment of the construction method according to the present invention. That is, a so-called double tube is used, and the hardening agent injection tube 10 is an application of the improved single tube of the other invention, but the side surface injection nozzle 13 is an air injection tube extending from the air injection tube 12. It is incorporated by the nozzle 14. Both of the side surface type nozzle and the direct type nozzle are opened and closed by the injection control devices 16 and 17. Needless to say, intermediate control such as narrowing the injection port of the nozzle is also possible. In addition, the bit propulsion force sensor 18 and the rod rotation torque sensor 19, which are the techniques in the other invention, are also installed at the lower end of the boring rod 8. A bit (excavation tooth) 34 is provided at the lower tip of the boring rod 8.

As described above, the reason why only the side surface type injection nozzle 13 is included in the air injection nozzle 14 is that since the direct type injection nozzle 15 is directly below the injection pipe 10, the injection pressure is also generally a side type injection nozzle. Higher than the nozzle 13, and
This is because the injection hole which is a vertical hole has already been excavated by the boring rod 8 and, as compared with the side surface of the rod, high pressure injection is not usually required. That is, when the ground improvement body having a large diameter is required because only the vertical hole is formed and the side surface is not excavated, the control valve of the direct injection nozzle 15 is narrowed as much as possible and the side injection nozzle This is because it is more suitable for side surface excavation to combine and inject the curing agent from the side surface nozzle with 13 and high-pressure air.

According to the embodiment of FIG. 2, it is possible to freely adjust the injection amount, injection timing, injection angle and the like to the vertical holes and the side holes formed while the curing agent is being injected. It can also deal with soil conditions. That is, by closing the control valve of the side surface type injection nozzle 13, the curing agent is injected only from the direct type injection nozzle 15, and in that case, the curing agent is injected only into the vertical injection hole. The so-called rod-shaped ground improvement body 32 (see FIGS. 4 and 5)
Only will be formed. Further, even when only the control valve of the side-face type injection nozzle 13 is closed, it is possible to operate only the air injection pipe 12 which is an independent injection pipe. By injecting, the diameter of the rod-shaped improvement body can be increased. In this case, it goes without saying that by opening not only the air jet nozzle 14 but also the side jet nozzle 13, it is possible to create an improved body having a larger diameter than in the case where only the air jet nozzle is opened. In addition, the control valve of the direct injection nozzle 15 is closed and only the side injection nozzle 13 is opened.
The case of injecting the curing agent is as in the prior art.

Next, the direct type injection nozzle 15 is opened to inject the curing agent, and the control valve of the side type injection nozzle 13 is opened only by a certain rotation angle (for example, 30 degrees), and after raising a certain distance, the same is performed again. By repeating the same operation of opening the side surface injection nozzle 13 at the same position and the same angle, the deformed ground improvement body having the branch ground improvement body 33 formed only in one direction with the bar-shaped ground improvement body 32 as the center. 31 can be formed (see FIG. 4A). A plan sectional view of this improved body can be understood in FIG. 5 (1).

When the controller 29 is operated to inject the curing agent from both the side surface type and direct type nozzles while the boring rod 8 rotates, the side surface type injection nozzle 13 injects the curing agent at a constant angle. Not only in the upper and lower relations, the injection is repeated intermittently, so that FIG.
It is also possible to create a modified ground improvement body 31 in which branch ground improvement bodies 33 are alternately formed on the rod-shaped ground improvement body 32 as shown in (B). If the operations for creating such a branch ground improvement body are performed at the same position in the vertical relationship,
The deformed ground improvement body 31 as shown in FIG. 5 (2) can be created.

Further, at the same depth position, the side surface type injection nozzle 13 injects the hardening agent, but when the boring rod 7 rises, if the side surface injection is performed at regular intervals, a so-called direct type injection is formed. Figure 4
The modified ground improvement body 31 as shown in (C) can be created. This improved body is generally the strongest and can cope with various types of ground centered on soft ground. A plan view of this improved body is as shown in FIG.

In the above various operations, it is of course possible to control the direct injection nozzle 15 through the control device 17 by the control device 29 located in the control center on the ground. It is significant to control the injection control device 16 by the overall control device 29. Then, the overall control can be generally automatically controlled by selecting a spray pattern that has been programmed in advance on the touch panel according to the soil condition. Needless to say, each injection pattern can be controlled manually.

FIG. 3 shows a second embodiment of the ground improvement reclamation construction method according to the present invention. That is, a conventional technique related to a so-called triple tube (Japanese Patent Application No. 1-3077, US Pat.
No. 71, 480), the hardener injection pipe for injecting from the direct injection nozzle 15 is provided with the injection pipe 11 which is its own direct passage. Since the injection pipe for the side jet nozzle 13 is provided separately,
The injection pressure at both positions is not affected and no problem occurs. That is, it is not necessary to adjust the injection pressures of both nozzles, and only the injection pressures of the respective nozzles are sufficient.
In particular, various controls corresponding to the various deformed ground improvement bodies described in the first embodiment described above become extremely easy.

In addition, if one curing agent injection pipe is used for the side surface type and direct type injection nozzles, the injection amount of the curing agent is naturally reduced to the other side, but this second embodiment In this case, since the hardening agent pressure-fed from the individually provided ultra-high pressure grout pumps 20 and 21 is injected through the individual injection pipes, a sufficient hardening agent can be injected as necessary. Therefore, it is possible to create a deformation-improving body as desired. The functions of the air injection nozzle 14, the bit propulsion force sensor 18, the rod rotation torque sensor 19 and the like are as described above.

Finally, FIG. 1 is a schematic sectional view showing an example of use of the second embodiment in FIG. Therefore, this is an air compressor 22, two ultra high pressure grout pumps 2
From 0 and 21, the air and the curing agent are fed under pressure,
Each injection nozzle 13, through each injection port 23, 24, 25, through an independent injection pipe of the boring rod 8,
After reaching 14 and 15, the hardener is injected according to the instructed injection pattern by the comprehensive control command device 29 on the ground. The boring rod 8 always rotates and rises at a constant speed regardless of whether or not the curing agent is sprayed under control. However, it is also possible to rotate only a certain angle by the control device 29. By the above operations, various deformed ground improvement bodies including those not shown can be constructed.

[0016]

According to the present invention, it is possible to obtain a tough and useful deformed ground improvement body corresponding to the soil condition known by the analysis apparatus of the other invention. In particular, FIG.
The deformed bodies shown in (B) and (C) can deal with soft ground and the like more than conventional improved bodies. Further, the direct injection nozzle according to the other invention makes the rod-shaped ground improvement body stronger than the conventional one, and therefore, in combination with the method of the present invention, a great effect is exhibited. In view of the increase in the number of buildings and the increase in deep underground structures, the need for the modified ground improvement body according to the present invention is increasing.

[0017]

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a usage example of a second embodiment according to the present invention.

FIG. 2 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a deformed ground improvement body constructed by the method according to the present invention.

FIG. 5 is a horizontal cross-sectional view of a modified ground improvement body constructed by the method according to the present invention.

[Explanation of symbols]

 8 Boring Rod 9 Analyzing Device 10 Curing Agent Injection Pipe for Side-Side Injection Nozzle 11 Hardening Agent Injection Pipe for Direct Under Injection Nozzle 12 Air Injection Pipe 13 Side Injection Jet 14 Air Injection Nozzle 15 Direct Injection Nozzle 16 For Side Injection Nozzle Injection control device 17 Injection control device for direct injection nozzle 18 Bit propulsion force sensor 19 Rod rotation torque sensor 34 Bit 20, 21 Super high pressure grout pump 22 Air compressor 23, 24 Hardener injection port 25 Air injection port 26 Oil pump 27 Oil Tank 28 Rotational propulsion / retraction function 29 Control device 30 Motor 31 Deformed ground improvement body 32 Bar-shaped ground improvement body 33 Branch-shaped ground improvement body

Claims (2)

[Claims] 1. A boring rod has a tip side wall and a plurality of nozzles, which are hardening agent jetting holes at the tip, a control valve for controlling an injection amount injected from the nozzle, and an automatic or manual control device for controlling the control valve. A device for forming a ground improvement body having, by controlling the injection amount, injection time, or injection angle of each nozzle according to the conditions of the ground or the application of the ground improvement body, thereby forming a deformation improvement body according to the application. A method for constructing a modified ground improvement body, which is characterized by 2. The method for constructing a deformed ground improvement body according to claim 1, wherein the formed ones are various deformed ground improvement bodies.