JP2007284902A - Steel pipe press-fit assisting device and steel pipe press-fitting method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe press-fit assisting device capable of smoothly excavating a hard ground or a rock with an auger screw and press-fitting a steel pipe sheet pile by a pile press-fitting machine and a steel pipe press-fitting method using the assisting device. <P>SOLUTION: The steel pipe press-fit supporting device 10 is suspended by a crane 4A. The casing 12 of the steel pipe press-fit supporting device 10 is inserted into a steel pipe sheet pile 2. The motor 16 of the earth auger 14 is placed on and fixed to the upper end surface 12A of the casing 12 of the steel pipe press-fit auxiliary device 10. The auger screw 18 of the earth auger 14 allows the casing 12 to be inserted therein. The end of the auger screw 18 is projected from the lower end surface 12B of the casing 12. Two locking recessed bodies 20 are secured to the outer peripheral surface of the casing 12. Two locking projecting bodies 24 are projected from the inner peripheral surface of the upper part 2A of the steel pipe sheet pile 2 to face each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention mainly relates to a steel pipe press auxiliary device used when pressing steel pipes such as steel pipe sheet piles into the ground or rock using a pile press machine when performing foundation work of construction work, and steel pipe press fitting using the same. Concerning construction method.

In foundation work at construction sites, steel pipe sheet piles as steel pipes may be buried by being pressed into the ground or rock using a hydraulic pile press.
In this case, if the ground into which the steel pipe sheet pile is pressed is a hard ground or a rock, it may be extremely difficult to press the steel pipe sheet pile into the ground or the bedrock only by a press-fitting operation using only a hydraulic pile press.
Therefore, a hydraulic pile is used after excavating a hard ground or rock mass with an auger screw of the earth auger using a digging pillar car (Patent Document 1) equipped with a crane having an earth auger attached to the tip. A construction method in which a steel pipe sheet pile is press-fitted using a press-fitting machine has been proposed.
However, since the digging column car has a structure in which an earth auger is rotatably attached to the tip of the mounted crane, the working radius of the digging work is small, and no digging column car is arranged near the excavation site It is impossible to excavate the ground or rock in a vertical state.
For this reason, it is necessary to provide a solid work gantry on the construction site for disposing the digging column car near the excavation site. In addition, when a steel pipe sheet pile is press-fitted after excavation, it is necessary to sequentially provide a solid work gantry for arranging the digging column car near the excavation site. Therefore, there is a problem that complicated work such as construction of the work gantry and demolition of the work gantry is required separately.
Therefore, the earth auger was suspended vertically with a crane, and the auger screw of the suspended earth auger was inserted into the steel pipe sheet pile to excavate the inside of the steel pipe sheet pile vertically, using a steel pile sheet pile using a hydraulic pile presser A method of press-fitting is proposed.
In this case, however, the frictional resistance that the auger screw receives during excavation increases depending on the hardness conditions of the ground and bedrock to be excavated, and the frictional resistance is transmitted to the earth auger that is suspended vertically from the crane. The motor itself rotates and the driving force of the motor becomes difficult to be transmitted to the auger screw, and smooth excavation by the auger screw may be difficult.
Japanese Patent Laid-Open No. 6-137054

  The present invention has been made in view of the above-mentioned facts, and it is possible to smoothly excavate hard ground or rock with an auger screw without constructing a solid work gantry near the excavation site. A steel pipe press-fitting auxiliary device capable of smoothly press-fitting a steel pipe such as a steel pipe and a steel pipe press-fitting method using the same.

The invention of claim 1 is a steel pipe press-fitting auxiliary device used when press-fitting a steel pipe into the ground or rock with a pile press-in machine, and a casing formed to be insertable into the steel pipe in a suspended state; An earth auger motor fixed to the casing, an auger screw of the earth auger that is inserted in the casing and arranged so that a tip end portion protrudes from a lower end surface of the casing, and an outer peripheral surface of the casing. A first locking body and a second locking body which is provided on an inner peripheral surface of the steel pipe and prevents the motor itself from rotating during excavation work of the auger screw in cooperation with the first locking body. It is characterized by having.
The invention of claim 2 is a steel pipe press-fitting auxiliary device that is used when a steel pipe is press-fitted into the ground or rock with a hydraulic pile press-in machine, and is formed so as to be suspended by a crane and inserted into the steel pipe sheet pile. A cylindrical casing, a motor for an earth auger fixed to the upper end surface of the casing, an auger screw for the earth auger that is inserted in the casing and arranged so that a tip end portion projects from the lower end surface of the casing; The auger screw excavation work in cooperation with the first locking body fixed to the outer peripheral surface of the casing and the inner locking surface of the steel pipe sheet pile and locking with the first locking body And a second locking body for preventing the motor itself from rotating at times.
The invention of claim 3 is a steel pipe press-in method that is carried out using the steel pipe press-in auxiliary device according to claim 1 or claim 2 when press-fitting a steel pipe into the ground or rock with a pile press-in machine, The steel pipe press-fitting device is suspended by a crane after the steel pipe to be pressed into the pile press-fitting machine is held, and the first locking body formed on the outer peripheral surface of the casing of the steel pipe press-fitting auxiliary device is held by the pile presser. The casing is inserted into the steel pipe corresponding to the second locking body formed on the inner peripheral surface of the steel pipe, the earth auger of the steel pipe press-fitting auxiliary device is started, and the ground and the rock are excavated with the auger screw, The steel pipe is press-fitted by press-fitting the steel pipe into the ground or rock with the pile press-in machine.
The invention of claim 4 is a steel pipe press-in method that is performed using the steel pipe press-in auxiliary device described in claim 1 or claim 2 when a steel pipe sheet pile is press-fitted into the ground or rock with a hydraulic pile press-in machine. The steel pipe sheet pile to be press-fitted into the hydraulic pile press machine is clamped and the steel pipe press-in auxiliary device is suspended by a crane to form the first locking body formed on the outer peripheral surface of the casing of the steel pipe press-in auxiliary device. The casing is inserted into the steel pipe sheet pile corresponding to the second locking body formed on the inner peripheral surface of the steel pipe sheet pile sandwiched by the hydraulic pile press-in machine, and the earth auger of the steel pipe press-fitting auxiliary device is started. It is characterized in that a steel pipe sheet pile is press-fitted by excavating the ground or rock mass with an auger screw and press-fitting the steel pipe sheet pile into the ground or rock mass with the hydraulic pile press-fitting machine.

The steel pipe press-fitting auxiliary device of the present invention can smoothly excavate a hard ground or rock with an auger screw before the pile presser presses the steel pipe into hard ground or rock. It has an excellent effect that it can be press-fitted.
The steel pipe press-fitting method using the steel pipe press-fitting auxiliary device according to the present invention is capable of smoothly excavating hard ground and rocks with auger screws before the pile presser presses the steel pipes into hard ground and rocks. The machine has an excellent effect that the steel pipe can be smoothly press-fitted.
Further, in the steel pipe press-fitting method using the steel pipe press-fitting auxiliary device of the present invention, the first locking body formed on the casing of the steel pipe press-fitting auxiliary device is formed on the inner peripheral surface of the steel pipe firmly held by the pile press-fitting machine. Since it descends while being guided by the second locking body, the excavation accuracy of the auger screw can be improved as compared with the conventional method.

  Examples of the best mode for carrying out the invention are shown below.

1 to 4 show an embodiment of a steel pipe press-fitting auxiliary device and a steel pipe press-fitting method using the same according to the present invention. In this embodiment, a case where a steel pipe sheet pile 2 as a steel pipe is press-fitted into the ground 3 using a known hydraulic pile press-in machine 1 as a pile press-in machine will be described as an example.
1 and 3 show a steel pipe press-fitting auxiliary device 10 according to the present invention suspended from a hook 4B of a crane 4A of a crane 4 disposed behind a hydraulic pile presser 1. FIG. The crane 4A of the crane 4 is provided with a steel pipe sheet pile wire 4C for hanging the steel pipe sheet pile 2 in addition to the hook 4B.
As shown in FIG. 4, the outer diameter dimension of the cylindrical casing 12 which is a constituent member of the steel pipe press-fitting auxiliary device 10 is smaller than the inner diameter dimension of the steel pipe sheet pile 2 press-fitted into the ground 3 by the hydraulic pile press-fitting machine 1. Is formed. Therefore, the casing 12 can be inserted from the upper part 2A of the steel pipe sheet pile 2. The casing 12 shown in FIGS. 1 and 4 is shown in a longitudinal sectional view.
As shown in FIGS. 1 and 4, the upper end surface 12 </ b> A of the casing 12 of the steel pipe press-fitting auxiliary device 10 is fixed in a state where a motor 16 of an earth auger 14 that is a constituent member of the steel pipe press-fitting auxiliary device 10 is placed. Has been. The earth auger 14 is a known earth auger, and a long auger screw 18 is detachably attached to a lower portion of the motor 16 via a joint member 17.
As shown in FIG. 1, the auger screw 18 of the earth auger 14 is inserted through the casing 12, and the tip 18 </ b> A of the auger screw 18 is disposed so as to protrude from the lower end surface 12 </ b> B of the casing 12. Accordingly, when the motor 16 of the earth auger 14 is started, the auger screw 18 rotates to excavate the ground 3.
As shown in FIGS. 1 and 3, a locking recess 20 as a first locking body having a length substantially the same as that of the casing 12 is provided at an interval of 180 ° on the outer peripheral surface of the casing 12 in the vertical direction. Two of them are fixed. The locking recess 20 is configured by fixing the rails 20A and 20A to the outer peripheral surface of the casing 12 in parallel in the vertical direction.
As shown in FIGS. 2 and 3, a locking body accommodating portion 22 is formed between the rail 20 </ b> A and the rail 20 </ b> A of the locking recess 20.
As shown in FIG. 2 and FIG. 4, a locking projection 24 as a second locking body is opposed to each other on the inner peripheral surface of the upper portion 2 </ b> A of the steel pipe sheet pile 2 by an appropriate means such as welding. It is installed. These locking projections 24 are respectively accommodated in the locking body accommodating portions 22 of the locking recesses 20 formed on the outer peripheral surface of the casing 12. Further, joints 2B and 2B are fixed to the outer peripheral surface of the steel pipe sheet pile 2 by appropriate means such as welding, so that the steel pipe sheet pile 2 can be connected in a continuous state. Therefore, the steel pipe sheet pile 2 is different from the known steel pipe sheet pile only in that the locking convex body 24 is provided on the inner peripheral surface of the upper portion 2A, and the other structure is the same as the known steel pipe sheet pile.
As shown in FIGS. 1 and 4, a suspension wire 28 is attached to the earth auger 14. The suspension wire 28 is locked to the hook 4B of the crane 4A of the crane 4 that suspends the steel pipe press-fitting auxiliary device 10.

Next, an embodiment of a steel pipe press fitting method performed using the steel pipe press fitting auxiliary device 10 will be described.
As a preparatory stage, the hydraulic pile press-in machine 1 is disposed at the foundation construction site where the steel pipe sheet pile 2 is embedded. Moreover, the crane 4 which suspends the said steel pipe sheet pile 2 and provides it to the hydraulic pile presser 1 and also suspends the steel pipe press-fit auxiliary device 10 is arrange | positioned. In addition, two locking projections 24 are protruded and fixed in advance on the inner peripheral surface of the upper part 2A of the steel pipe sheet pile 2 (the one located above when press-fitted) in a state of facing each other.
First, the crane 4 lifts the prepared steel pipe sheet pile 2 with a steel pipe sheet pile wire 4C provided on the crane 4A, and then provides it to the hydraulic pile press-in machine 1. As shown in FIG. 4, the hydraulic pile press-in machine 1 provided with this steel pipe sheet pile 2 is firmly attached to the chuck 1 </ b> A with the steel pipe sheet pile 2 standing vertically so that the upper part 2 </ b> A of the steel pipe sheet pile 2 is upward. Pinch.
Next, the crane 4 locks the hook 4 </ b> B of the crane 4 </ b> A to the suspension wire 28 of the steel pipe press-fitting auxiliary device 10 and lifts the steel pipe press-fitting auxiliary device 10 vertically. The casing 12 is inserted from the upper part 2A of the steel pipe sheet pile 2 sandwiched by the hydraulic pile presser 1. At this time, the locking body accommodating portion 22 of the locking recess 20 protruding from the casing 12 corresponds to the locking protrusion 24 protruding from the inner peripheral surface of the upper portion 2A of the steel pipe sheet pile 2. Then, the casing 12 is suspended so that the locking convex body 24 of the steel pipe sheet pile 2 is accommodated in the locking body accommodating portion 22 of the casing 12.
Therefore, as shown in FIG. 2, the locking convex body 24 of the steel pipe sheet pile 2 is accommodated in the locking body accommodating portion 22 of the locking concave body 20 fixed to the casing 12.
Then, the steel pipe press-fitting auxiliary device 10 is further lowered, the motor 16 of the earth auger 14 is started, and the auger screw 18 is rotated. As a result, the tip 18A of the auger screw 18 projecting below the lower end surface 12B of the casing 12 begins to excavate the ground 3.
When the auger screw 18 starts excavation, a large frictional resistance may be generated in the auger screw 18 depending on the hardness condition of the ground 3 or the like. At this time, a large frictional resistance is transmitted to the motor 16 of the earth auger 14 via the auger screw 18, and even if the motor 16 itself tries to rotate, as shown in FIG. 2, the locking recess of the casing 12 to which the motor 16 is fixed. A locking convex body 24 protruding from the inner peripheral surface of the steel pipe sheet pile 2 firmly held in the chuck portion 1A of the hydraulic pile press-fitting machine 1 is accommodated in the locking body accommodating portion 22 of 20. For this reason, even if the motor 16 itself and the casing 12 itself try to rotate, they are blocked by the locking convex body 24.
Therefore, even when a large frictional resistance acts on the auger screw 18 during excavation of the ground 3, the steel pipe sheet pile 2 in which the casing 12 to which the motor 16 is fixed is firmly held by the chuck portion 1 </ b> A of the hydraulic pile presser 1. Is prevented from turning by.
For this reason, since the motor 16 itself of the earth auger 14 does not rotate, the driving force of the motor 16 is smoothly transmitted to the auger screw 18, and the auger screw 18 can smoothly excavate even if the ground 3 is hard. .
As a result, when the steel pipe sheet pile 2 is press-fitted by the hydraulic pile press-in machine 1, the hard ground 3 is excavated by the auger screw 18 of the steel pipe press-in auxiliary device 10 first. 2 can be smoothly press-fitted into the ground 3.
Further, when the auger screw 18 excavates the ground 3, the casing 12 of the steel pipe press-fitting auxiliary device 10 is lowered while being guided by the locking convex body 24 of the steel pipe sheet pile 2 firmly held by the hydraulic pile press-fitting machine 1. Therefore, the auger screw 18 can excavate the ground 3 with higher accuracy than in the conventional method, and thus the excavation accuracy by the auger screw 18 can be increased.

In the embodiment, the locking concave body 20 is shown as the first locking body and the locking convex body 24 is shown as the second locking body, but the first locking body and the second locking body are the first locking body. If the stop body and the second locking body cooperate to prevent the motor 16 itself of the steel pipe press-fitting auxiliary device 10 from rotating during excavation, the locking concave body 20 and the locking convex body 24 can be used. Of course, the present invention is not limited to this configuration.
Therefore, for example, as shown in FIG. 5, the locking recess 20 is formed in a small size, or as shown in FIG. 6, one rail 20A is provided on the outer peripheral surface of the casing 12, and the steel pipe sheet pile 2 is provided. Of course, it may be configured to be engaged with the engaging convex body 24.

In addition, in the Example, although the steel pipe sheet pile 2 was shown as an example as a steel pipe press-fit in the ground 3, if the steel pipe to press-fit is a steel pipe, it is needless to say that it is not limited to the steel pipe sheet pile 2.
Moreover, in the Example, although the hydraulic pile presser 1 was shown as an example as a pile presser which presses in a steel pipe, if it is a pile presser which presses in a steel pipe, it is not limited to the hydraulic pile presser 1 Of course.
In addition, in the Example, although the two latching recessed bodies 20 were provided in the casing 12, and the two latching convex bodies 24 were provided in the steel pipe sheet pile 2, the latching fixed to the casing 12 and the steel pipe sheet pile 2 was shown. Of course, the number of the concave body 20 and the locking convex body 24 may be one, or three or more.

It is a partial longitudinal cross-sectional view of the steel pipe press-fit auxiliary device of the embodiment suspended by a crane. It is a partial cross section figure of the state which inserted the steel pipe press-fit auxiliary | assistance apparatus of the Example into the steel pipe sheet pile. It is a side view of the casing of the steel pipe press-fit auxiliary device of the example. It is a partial longitudinal cross-sectional view which shows the construction method which press-fits a steel pipe sheet pile using the steel pipe press-fit auxiliary | assistance apparatus of an Example. It is a partial cross section figure of the state which inserted the steel pipe press-fit auxiliary apparatus which shows the modification of the steel pipe press-fit auxiliary apparatus of an Example into the steel pipe sheet pile. It is a partial cross section figure of the state which inserted the steel pipe press-fit auxiliary apparatus which shows the other modification of the steel pipe press-fit auxiliary apparatus of an Example in the steel pipe sheet pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic press-fit machine 2 Steel pipe sheet pile 10 Steel pipe press-fitting auxiliary device 12 Casing 14 Earth auger 16 Motor 18 Auger screw 20 Locking concave body 22 Locking body accommodating part 24 Locking convex body

Claims (4)

  A steel pipe press-fitting auxiliary device used when a steel pipe is press-fitted into the ground or rock with a pile press machine, and a casing formed so as to be able to be inserted into the steel pipe in a suspended state, and a ground fixed to the casing An auger motor, an auger screw of the earth auger that is inserted in the casing and disposed so that a tip end portion protrudes from a lower end surface of the casing, and a first locking body fixed to an outer peripheral surface of the casing; A second locking body provided on an inner peripheral surface of the steel pipe and preventing the motor itself from rotating during excavation work of the auger screw in cooperation with the first locking body. A steel pipe press-fitting auxiliary device characterized by that.   A steel pipe press-fitting auxiliary device used when a steel pipe is press-fitted into the ground or rock by a hydraulic pile press-in machine, and a cylindrical casing that is suspended by a crane and can be inserted into the steel pipe sheet pile, An earth auger motor fixed to the upper end surface of the casing, an auger screw of the earth auger that is inserted through the casing and disposed so that a leading end projects from the lower end surface of the casing, and an outer peripheral surface of the casing The motor itself rotates during the excavation work of the auger screw in cooperation with the fixed first locking body and the inner peripheral surface of the steel pipe sheet pile and by locking with the first locking body. A steel pipe press-fitting auxiliary device, comprising: a second locking body that prevents   A steel pipe press-in method using the steel pipe press-in auxiliary device according to claim 1 or 2 when press-fitting a steel pipe into the ground or rock with a pile press-in machine, the steel pipe press-in into a pile press-in machine The steel pipe press-fitting auxiliary device is suspended by a crane after holding the steel pipe, and the first peripheral body formed on the outer peripheral surface of the casing of the steel pipe press-fitting auxiliary device is held by the pile presser. The casing is inserted into the steel pipe corresponding to the second locking body formed on the steel pipe, the earth auger of the steel pipe press-fitting auxiliary device is started, the ground or rock is excavated with an auger screw, and the steel pipe is cut with the pile press-in machine A steel pipe press-in method using a steel pipe press-in auxiliary device, which presses the pipe into the ground or rock. A steel pipe press-in method using the steel pipe press-in auxiliary device according to claim 1 or 2 when a steel pipe sheet pile is press-fitted into the ground or rock by a hydraulic pile press-in machine, After the steel pipe sheet pile to be press-fitted into the machine is clamped, the steel pipe press-fitting auxiliary device is suspended by a crane and the first locking body formed on the outer peripheral surface of the casing of the steel pipe press-fitting auxiliary device is held by the hydraulic pile presser The casing is inserted into the steel pipe sheet pile so as to correspond to the second locking body formed on the inner peripheral surface of the steel pipe sheet pile, the earth auger of the steel pipe press-fitting auxiliary device is started, and the ground and bedrock are moved with the auger screw. A steel pipe press-fitting method using a steel pipe press-fitting auxiliary device, wherein the steel pipe sheet pile is press-fitted by excavating and press-fitting the steel pipe sheet pile into the ground or rock by the hydraulic pile press-fitting machine.

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