JP6945329B2 - Underground obstacle removal method - Google Patents

Description

The present invention relates to a method for removing underground obstacles. More specifically, the present invention relates to an underground obstacle removal method using a rotary press-fitting machine that can be used to remove underground concrete structures and rocks that are obstacles when a pile is press-fitted into the ground.

When a pile is press-fitted into the ground, if there is an existing concrete structure or an underground obstacle such as a large rock in the ground, the new pile cannot be effectively press-fitted unless it is removed.
Therefore, it is necessary to remove underground obstacles in advance or during construction work. The following are conventional techniques for removing underground obstacles.

The prior art of Patent Document 1 is to excavate an underground obstacle using a bucket suspended from the boom tip of an excavator.
In this conventional technique, excavation by a bucket is used, so that an area considerably larger than the size for building a pile is excavated, and construction cannot be performed in a narrow space. In addition, since cement and the like must be added and solidified after excavation, the work man-hours are considerably large. Therefore, the construction period and cost required for removing underground obstacles will be excessive.

In the prior art of Patent Document 2, a middle excavator suspended from the boom tip of a boring machine is inserted into a casing tube and fixed, and the ground is excavated by the middle excavator while pushing down the casing tube with the boring machine. It is a thing. According to this device, even hard ground can be excavated.
However, since this device is used with a long boom standing up and down on a crawler-type traveling vehicle body, the position of the center of gravity is high and the stability is not so high. Therefore, it can be installed only on a horizontal hard soil, and cannot be used on an inclined surface (such as a slope of a bank) or a water surface. Also, if there is an obstacle in the sky (there is a short head limit), it cannot be used because a long boom or the like can be used. In other words, the conditions of use were large in that the place of use was limited to wide flat land.

As a device similar to the boring machine using the crawler type traveling vehicle body of Patent Document 2, there are those described in Patent Document 4 and Patent Document 5. All of these are based on a crawler-type traveling vehicle body, and a long tower is erected up and down on the base machine, and it is equipped with a rotary drive such as an electric motor that hangs from the tip of the tower and a reduction mechanism such as a hydraulic cylinder. The auger screw with a head is rotated to excavate the ground.
In general, since a long tower of about 9 to 40 m is erected, the position of the center of gravity is high, so that the place of use is naturally restricted.

According to the prior art of Patent Document 3, an auger screw is gripped by a chuck of an all-around rotary excavator installed on the ground, the auger screw is rotated, and an underground obstacle is excavated by the auger head at the lower end.
This conventional technique has the disadvantages that the construction cost is high and the construction man-hours are also large because a full-circle rotary excavator, which is a dedicated facility, is used.

Japanese Unexamined Patent Publication No. 9-13373 Japanese Unexamined Patent Publication No. 8-303172 Japanese Unexamined Patent Publication No. 2014-218817 Japanese Unexamined Patent Publication No. 2005-220594 Japanese Unexamined Patent Publication No. 2001-98871

In view of the above circumstances, the present invention can work in a narrow space when there are underground obstacles, there are few restrictions on the place of use, and it can be used for underground obstacle removal while suppressing the construction period and construction cost. The purpose is to provide a method for removing obstacles.

The underground obstacle removing method of the first invention includes a press-fitting machine main body including a chuck capable of gripping a cylindrical member, an elevating means for raising and lowering the chuck, and a clamp for fixing the press-fitting machine main body on an existing pile. A method for removing underground obstacles using a rotary press-fitting machine, wherein the chuck has a rotary drive mechanism for gripping and rotating an excavating member for excavating an underground obstacle in a circular vertical hole. Therefore, the excavation member includes a pipe body and a pipe body with a drilling tool to which an excavating tool is attached to the lower end of the pipe body. The setting process of setting the excavation member to a possible state, (II) the excavation process of rotating and lowering the excavation member gripped by the chuck and digging the excavation member into the ground , (III) the excavation after drilling to a predetermined depth. It is characterized in that the underground obstacle is removed by repeating the steps (I) to (III) above as many times as necessary, which is a step of raising and pulling out a member to crush the underground obstacle and discharging the crushed material. ..
The underground obstacle removing method of the second invention is characterized in that, in the first invention, the length of the pipe body is changed to a length according to an excavation depth .
The underground obstacle removing method of the third invention is characterized in that, in the first or second invention, a plurality of the pipe bodies are added to secure a required excavation depth .

According to the first invention, the following effects are obtained.
a) Since the excavating member is rotated and reduced by the chuck of the rotary press-fitting machine, the underground obstacle is made into a circular vertical hole without another machine or power (for example, a hydraulic motor) for rotating the excavating member. It can be excavated and removed, and this work can be done in tight spaces. Further, since the rotary press-fitting machine fixed on the existing pile by the clamp provided by the own machine is used, it is possible to remove the underground obstacle in a stable state by taking the reaction force from the existing pile. In addition, as long as there are existing piles, it can be constructed on an inclined surface or on water, and since the height of the rotary press-fitting machine itself is low, it can be constructed even in a place where there is a short head. Furthermore, since it is only necessary to attach the excavation member that does not require a dedicated drive source to the rotary press-fitting machine and use it, it is not necessary to use an excavator having a dedicated drive source, and the construction cost can be reduced. The construction period can be shortened .
b) Underground obstacles can be excavated and removed by gripping the pipe with excavator with a chuck and rotating it. In addition, since the pipe body can be added to the upper part, the pipe body under construction can be shortened and the height of the auger protruding above the chuck can be suppressed, so construction can be performed in places with upper obstacles. Become.
c) Vertical holes of the required depth can be formed in underground obstacles.
According to the second invention, a vertical hole longer than a pipe body with an auger head can be excavated, and a short pipe body can be used for construction in a low posture even in a place where there is an obstacle in the sky.
According to the third invention, the required depth can be secured by the number of additional pipes.

It is explanatory drawing of the excavation work using the auger screw 30. It is explanatory drawing of the excavation work using the pipe body 40 with an auger head. It is explanatory drawing of the excavation work using the pipe body 60 with a detachable auger head. It is explanatory drawing of the rotary press-fitting machine used in the underground obstacle removal method of this invention. It is a partial cross-sectional enlarged view of the rotary press-fitting machine shown in FIG. It is a top view of the chuck 5 shown in FIG. It is explanatory drawing of the setting process (1) and the excavation start process (2) in the underground obstacle removal method of this invention. It is explanatory drawing of the earth removal step (3) and the re-cutting step (4) in the underground obstacle removal method of this invention. It is explanatory drawing of the excavation end state (5) and the pull-out process (6) in the underground obstacle removal method of this invention. It is explanatory drawing of the press-fitting pile setting process (7) and press-fitting process (8) after removing the underground obstacle.

Next, an embodiment of the present invention will be described with reference to the drawings.
(Basic concept)
The basic concept of the present invention is to excavate and remove underground obstacles such as concrete structures in the ground without using an extra device by utilizing the function of the rotary press-fitting machine, and the rotary press-fitting machine is a chuck. It is characterized by having a mechanism for gripping and rotating an excavation member for excavating an underground obstacle and a clamp for fixing the press-fitting machine main body on an existing pile.

(Rotary press-fitting machine)
The "rotary press-fitting machine" as used herein is a type of press-fitting machine that press-fits a pile with a static load applied by a press-fitting machine that takes a reaction force from an existing pile, and is an excavation member for excavating underground obstacles. A press-fitting machine that has the function of rotating and raising and lowering.

First, the basic configuration of the rotary press-fitting machine will be described with reference to FIG. The rotary press-fitting machine A includes a press-fitting machine main body and a clamp.
The press-fitting machine main body was erected on the slide frame 2 and the slide frame 2 that slide in the front-rear direction (the left-right direction in the figure, which means the front and the rear in the progress direction of the press-fitting work) with respect to the saddle 1 and the saddle 1. It is equipped with a leader mast 3. Further, a chuck frame 4 is mounted in front of the leader mast 3 so as to be able to move up and down by being guided by an appropriate guide, and a chuck 5 is mounted at the lower end of the chuck frame 4. A main cylinder 6 is attached between the leader mast 3 and the chuck frame 4, so that the chuck frame 4 can be raised and lowered.

The leader mast 3 and the main cylinder 6 constituting the press-fitting machine main body have short vertical lengths, and the total height of the press-fitting machine main body is about 4 to 5 m, so the machine is not so high. Therefore, the center of gravity of the rotary press-fitting machine A is low.
On the other hand, several clamps 7 for gripping the existing anti-P that have already been constructed are provided below the saddle 1, so that the press-fitting machine main body can be fixed on the existing pile. Therefore, the rotary press-fitting machine A can work in a stable state by taking a reaction force from the existing pile.

As shown in FIGS. 5 and 6, the chuck frame 4 includes a slide guide 4g, a frame base 4a connected to the main cylinder 6, and a chuck holding portion 4b formed in front of the frame base 4a. Consists of.
The chuck holding portion 4b is a member having an annular portion penetrating in the vertical direction, and an excavation member described later can be passed vertically. The frame base portion 4a and the chuck holding portion 4b are integrally formed members.

The chuck 5 includes a gripping mechanism 10 and a rotating mechanism 20, and their control units are provided at appropriate positions in the press-fitting machine main body.
The gripping mechanism 10 includes an annular outer casing 11, a plurality of grip plates 12 arranged inside the outer casing 11, and an opening / closing cylinder 13 for advancing and retreating the grip plates 12.
The outer casing 11 is an annular member, and the inner diameter thereof is substantially the same as the inner diameter of the chuck holding portion 4b, so that the outer casing 11 can penetrate the excavation member described later in the vertical direction.

On the inner circumference of the outer casing 11, four grip plates 12 are arranged along the circumferential direction. Each grip plate 12 is equally divided in the circumferential direction in the outer casing 11. Further, the shape is formed in an arc shape in a plan view, and the curvature thereof is substantially the same as the outer peripheral arc surface of the excavation member described later. Further, each grip plate 12 has a certain length in the vertical direction, so that when the cylindrical excavation member is gripped, the straightness of the excavation member can be easily maintained.

An opening / closing cylinder 13 composed of a hydraulic cylinder is arranged on the outside of the four grip plates 12, and each opening / closing cylinder 13 is attached between the outer casing 11 and each grip plate 12. Further, the opening / closing cylinder 13 is arranged at both the upper end portion and the lower end portion with respect to each of the grip plates 12.

In the open state in which the opening / closing cylinder 13 is contracted, a gap is generated between the outer circumference of the excavation member to be gripped and the grip plate 12, so that the excavation member is suspended inside the chuck 5 by a crane or the like. It can be freely inserted and removed.

Then, in the closed state in which the opening / closing cylinder 13 is extended, the circumferential surface of the grip plate 12 is strongly pressed against the outer peripheral surface of the inserted excavation member, and the excavation member can be firmly gripped. In this state, the excavation member can be freely rotated in both forward and reverse directions by the rotation mechanism 20 described later.

Since the above-mentioned grip plates 12 have four plates at equal intervals in the circumferential direction, the excavation members can be gripped accurately and coaxially, and each grip plate 12 presses the upper and lower ends with an opening / closing cylinder 24. By being added, the straightness can be accurately maintained without causing the excavation member to be inclined.

In the illustrated embodiment, four sets of the grip plate 12 and the opening / closing cylinder 13 are used, but three sets or six sets may be used and arranged symmetrically, and the number of sets may be arbitrarily changed. It is possible.
Further, in the illustrated embodiment, the cylinder of the opening / closing cylinder 13 is attached to the grip plate 12 side and the piston rod is attached to the outer casing 11 side. May be attached to the grip plate 12 side.

The rotation mechanism 20 includes a bearing 21, an external gear 22 on the outer periphery of the bearing 21, a pinion 23 that meshes with the external gear 22, and a motor 24.
The bearing 21 is annular and is provided between the outer casing 11 of the gripping mechanism 10 and the chuck holding portion 4b of the chuck frame 4, and rotatably supports the outer casing 11 with respect to the chuck holding portion 4b.
A pinion 23 meshes with an external gear 22 provided on the outer periphery of the bearing 21, and when the pinion 23 is forward-reversed by the motor 24, the external gear 22 is forward-reversed and the chuck 5 can be forward-reversed.

As shown in FIG. 4, when an excavation member (auger screw 30 in the illustrated example) is inserted into the chuck 5 and gripped, the excavation member can be rotated, and when the chuck frame 4 is lowered by the main cylinder 6, the chuck frame 4 is lowered. The excavation member can rotate and penetrate into the ground to excavate underground obstacles.

Further, in this work, since the existing anti-P that has already been constructed is gripped by the clamp 7, the press-fitting machine main body is in a stable state when excavating an underground obstacle.

In the present invention, since the excavation member is gripped and rotated by using the gripping mechanism 10 and the rotating mechanism 20 of the chuck 5 originally provided in the rotary press-fitting machine A as described above, the rotary press-fitting machine A does not need to be processed in any way. Also, underground obstacles can be removed without the need for another machine or power (eg, hydraulic motor, etc.) to rotate the excavation member. Therefore, the construction cost can be suppressed.

(Excavation member)
Three typical examples of the cylindrical excavation member used in the rotary press-fitting machine A of the present invention will be described.
FIG. 1 shows an example of an auger screw 30 in which a cylindrical excavation member has an auger head 33, FIG. 2 shows an example of a tubular body 40 with an auger head, and FIG. 3 shows an example of a tubular body 60 with a removable auger head. These cylindrical excavation members excavate in a circular vertical hole, and unlike those excavating in a ring shape, excavate the entire circular interior.
The reference numerals a to c in FIGS. 1 and 2 and the reference numerals a to d in FIG. 3 indicate the same drilling location, and only the difference in the drilling order is shown.

(Auger screw 30 having an auger head 33)
FIG. 1 shows a state in which the chuck 5 of the rotary press-fitting machine A directly grasps and rotates the outer peripheral portion of the auger screw 30 to remove the underground obstacle X.
The auger screw 30 has a spiral blade 32 attached to the outer circumference of the auger shaft 31. The auger head 33 is detachably attached to the lower end of the auger screw 30.
The auger head 33 has a large number of bits 34 having chips such as cemented carbide attached to the lower surface of blades extending in the radial direction. By reducing the auger head 33 while rotating it, an underground obstacle X such as a concrete structure or rock can be excavated in a circular vertical hole including the inside thereof.

The excavation diameter can be changed by replacing the auger head 33.
The auger screw 30 may be gripped by the chuck 5 directly or through an attachment. Examples of the attachment include a curved plate inserted between the grip plate 12 and the outer circumference of the auger screw. By using such an attachment, the auger screw 30 having a small outer diameter can be gripped even if the stroke of the opening / closing cylinder 13 is short.

As shown by reference numerals a to b, when the ground is dug with the auger screw 30 having the auger head 33 and hits an underground obstacle X such as a concrete structure (a), if the digging is continued, the auger head 33 excavates the ground. Underground obstacles can be crushed (b).
Then, the crushed material is discharged upward by the spiral blade 32 of the auger screw 30, that is, soil can be discharged at the same time as excavation. Therefore, if the auger screw 30 is dug to the required depth in the underground obstacle X, it is sufficient. Underground obstacle X can be removed. If the underground obstacle X can be removed, the auger screw 30 may be pulled out upward (c).

Another auger screw can be added to the auger screw 30 on the auger screw 30. Therefore, when the depth required for removing the obstacle is deeper than the length of the auger screw 30, the underground obstacle X can be removed deeper by adding the auger screw 30 as described above.
Further, in a place where the short head is restricted, the underground obstacle X can be removed by adding a short auger screw 30. Further, even when a lightweight and short auger screw 30 must be used in an ambient environment where only a small crane can be used, the underground obstacle X can be removed to the required depth by adding the short auger screw 30.

(Tube 40 with auger head)
FIG. 2 shows a state in which the chuck 5 of the rotary press-fitting machine A grabs and rotates the tubular body 40 with an auger head to remove the underground obstacle X.
The tube body 40 with an auger head is an example of a tube body with an excavator according to the present invention, in which the auger head 42 is attached to the lower end of a long cylindrical tube body 41. The auger head 42 has a large number of bits 44 having chips such as cemented carbide attached to blades extending in the radial direction at the lower end of the short auger shaft 43, and spiral blades 45 attached to the outer periphery of the auger shaft 43. This is an example of the excavator referred to in the present invention. The excavator according to the present invention may be a combination of an auger screw attached to the lower end of the pipe body and an auger head detachably attached to the lower end of the auger screw. The auger head used in this combination may or may not have spiral blades formed. Further, the auger screw used in this combination may be long if necessary. For example, in high-top construction or water construction, a pipe body 40 with an excavator having a long auger screw can be used.
Since the pipe body 41 and the auger head 42 in the pipe body 40 with an auger head are integrally connected, the underground obstacle X such as a concrete structure or rock can be made circular by reducing the pipe body 41 while rotating it. It is possible to excavate the vertical hole including the inside.

As shown by reference numerals a to c, an underground obstacle X such as a concrete structure is excavated by a pipe body 40 with an auger head (a), and further excavation is continued, and a spiral blade 45 around the auger shaft 43 is attached. When the crushed material is filled with the crushed material (b), the tube body 40 with an auger head is once pulled out to discharge the crushed material (c). Then, by repeating the above operations a to c a required number of times, a hole having a required depth can be formed in the underground obstacle X.

The excavation diameter can be changed by replacing the auger head 42.
Further, a tip excavating blade having an annular bit attached to the lower end of the tubular body 41 may be used, and the inside of the tip excavating blade may be cut in an annular shape by the auger head 42.
Since the pipe body 41 is a cylindrical body, it has high strength and can be gripped more strongly than when the outer peripheral portion of the auger screw is directly gripped, so that powerful excavation with a large torque is possible.

The length of the pipe body 41 may be changed according to the excavation depth. When the required excavation depth is deeper than the length of the pipe body 40 with an auger head, the required depth can be secured by adding several pipe bodies. Further, by using the short tube body 40 with an auger head, the height of protruding above the chuck 5 can be reduced, so that the underground obstacle X can be removed even when an obstacle is in the sky and a low posture is obliged. can. Further, since the pipe body 40 with an auger head is lighter than the auger screw of the same length, a small crane can be used in the setting process and the drawing process described later, and the construction cost is increased in this respect. Can be suppressed.

(Detachable auger head tube 60)
The removable auger head-attached pipe body 60 is an example of the pipe body with a removable excavator according to the invention, and includes an auger head 50, a clamp 55, and a pipe body 57 as shown in FIG.
FIG. 3 shows how the chuck 5 of the rotary press-fitting machine A grabs the pipe body 57 and rotates it, and the auger head 50 fixed inside the pipe body 57 removes the underground obstacle X.
The auger head 50 has a large number of bits 52 having chips such as cemented carbide attached to blades extending in the radial direction at the lower end of the short auger shaft 51, and a spiral blade 53 is attached to the outer periphery of the auger shaft 51. Is installed. By reducing the auger head 50 while rotating it, an underground obstacle X such as a concrete structure or rock can be excavated in a circular vertical hole including the inside thereof. The auger head 50 is an auger head with a clamp having a clamp 55, and the clamp 55 is composed of a jack or the like that operates hydraulically. Such a combination of the clamp 55 and the auger head 50 is an example of the excavator with a clamp according to the present invention. The excavator with a clamp according to the present invention may be a combination of a clamp, an auger screw with a clamp, and an auger head detachably attached to the lower end of the auger screw. The auger head used in this combination may or may not have spiral blades formed.

Reference numeral b indicates a state in which the clamp 55 is stretched against the inner wall of the tubular body 57 to fix the auger head 50 to the tubular body 57, and reference numeral c is a state in which the clamp 55 is separated from the inner wall of the tubular body 57 and the auger head 50 is fixed. Shows a state in which is free to move with respect to the tube body 57.
In this way, the auger head 50 is detachable from the tube body 57 by the clamp 55.

A method of removing an underground obstacle X such as a concrete structure using a pipe body 60 with a detachable auger head based on reference numerals a to d will be described. First, when digging with the auger head 50 slightly protruding from the tubular body 57 (a), the crushed material fills the portion around the auger shaft 51 to which the spiral blade 53 is attached to some extent (b). When the portion around the auger shaft 51 to which the spiral blade 53 is attached is almost filled with crushed material, the clamp 55 is loosened and the auger head 50 is pulled up into the tubular body 57 to prevent the crushed material from spilling (c). Then, the clamp 55 is stretched against the inner wall again, the auger head 50 is pulled up together with the pipe body 57 (d), and then the soil is discharged. Then, it is dug up again and this operation is repeated.
Then, when a hole having a required depth is formed in the underground obstacle, the detachable auger head-attached pipe body 60 is pulled out upward.
In the detachable auger head 60, the auger head 50 can be separated from the auger 57 by loosening the clamp 55. Therefore, in the step of discharging the crushed material filled during excavation, the auger 57 is removed. It may be left in the ground and only the auger head with a clamp having the clamp 55 attached to the auger head 50 may be raised and pulled out. In this way, the collapse of the ground can be prevented by the tubular body 57 left in the ground.

Even in this detachable tube body 60 with an auger head, the excavation diameter can be changed by exchanging the auger head 50.
Further, a tip excavating blade having an annular bit attached to the lower end of the tubular body 57 may be used, and the inside of the tip excavating blade may be cut in an annular shape by the auger head 50.
Since the pipe body 57 is a cylindrical body, it has high strength and can be gripped more strongly than when the outer peripheral portion of the auger screw is directly gripped, so that powerful excavation with a large torque is possible.

In this embodiment, since the auger head 50 can be separated from the pipe body 57 by loosening the clamp 55 as described above, it is possible to use a permanent pile such as a steel pipe pile or a PC pile as the pipe body 57. can. In this case, the pipe body may be left in the ground as it is after the cutting is completed. Further, the auger head 50 may be pulled out by loosening the clamp 55.

Further, in this embodiment, the cutting amount of the auger head 50, in other words, the excavation depth can be changed by changing the clamp height fixing the auger head 50 in the pipe body 57, so that the excavation efficiency can be changed. Can be raised.

When the required depth is deeper than the length of the pipe body 60 with an auger head, the underground obstacle X can be removed by adding the pipe body 57. Further, in a place where the short head is restricted, the underground obstacle X can be removed by adding a short pipe body 57. Further, even when a short pipe body 57 must be used due to the capacity of the crane, the underground obstacle X can be removed by adding the short pipe body 57.

(Underground obstacle removal method)
Hereinafter, the entire process of removing underground obstacles will be described with reference to FIGS. 7 to 10 by an example using the tube body 40 with an auger head.
(1) Setting process (Fig. 7)
The tubular body 40 with an auger head is set on the chuck 5 of the rotary press-fitting machine A. The tubular body 40 with an auger head is lifted by a crane or the like, put into the chuck 5, and gripped by the grip plate 12.
The rotary press-fitting machine A grips and fixes the existing pile with the clamp 7 held below the saddle 1. Since the press-fitting reaction force can be obtained by fixing to the existing pile, it is possible to press-fit the pile or the pipe body 40 with an auger head which is an excavation member.

(2) Excavation start process (Fig. 7)
By reducing the pipe body 40 with an auger head while rotating it with the rotary press-fitting machine A, it is possible to excavate an underground obstacle X such as a concrete structure and drill a vertical hole.

(3) Soil removal process (Fig. 8)
During this excavation work, when the portion around the auger shaft 43 to which the spiral blade 45 is attached is filled with crushed material, the pipe body 40 with the auger head is once pulled out, and the crushed material scraped up by the spiral blade 45 is discharged. do.

(4) Re-excavation process (Fig. 8)
Then, by repeating the above operations 1 to 3 as many times as necessary, a circular vertical hole having a required depth can be formed in the underground obstacle.

(5) Excavation completed state (Fig. 9)
Once a circular vertical hole of the required depth is formed in the ground, the removal of underground obstacles is complete.

(6) Pulling process (Fig. 9)
When the removal of the underground obstacle X is completed, the pipe body 40 with the auger head is removed from the chuck 5 of the rotary excavator A. To remove it, the grip plate 13 may be opened, and then the tube 40 with an auger head may be lifted by a crane or the like to completely pull out the tube 40 with an auger head.
After this, the original pile press-fitting process is carried out.

(7) Press-fit pile setting process (Fig. 10)
In order to carry out the original pile press-fitting process, first, a new press-fitting pile Pm to be built in the chuck 5 of the same rotary press-fitting machine A is grabbed.

(8) Press-fitting process (Fig. 10)
When the chuck 5 is lowered by the main cylinder 6 while the press-fitting pile Pm is grasped by the chuck 5, the press-fitting pile Pm is built in the vertical hole.

(Effect of this method)
According to the construction method of the present embodiment, the following effects are obtained.
a) The chuck 5 of the rotary press-fitting machine A rotates the auger screw 30, the auger head-equipped pipe 40, and the detachable auger head-equipped pipe 60, and if the auger screw 30 is press-fitted while rotating, an underground obstacle X such as a concrete structure X. Can be removed by excavating in the shape of a circular vertical hole. And since the work is just digging a vertical hole, it can be done in a narrow space.

b) The rotary press-fitting machine A is fixed on the existing pile P by a clamp 7 provided by the own machine. Therefore, as long as there are existing piles, the rotary press-fitting machine A can be fixed with verticality even on an inclined surface, and even on water, if there are existing piles, the rotary press-fitting machine A can be fixed and constructed. Further, since the total height of the rotary press-fitting machine A itself is as low as 4 to 5 m, it can be installed even in a place where short heading is restricted.

c) Since the auger screw 30 and the pipe bodies 41 and 57 can be added to the upper part, the auger screw 30 and the pipe bodies 41 and 57 under construction are shortened as necessary, and the excavation member that protrudes above the chuck. Since the height of the pipe can be suppressed, it is possible to construct in a place where there is an upper obstacle.

d) In the removal of underground obstacles using the rotary press-fitting machine A, it is only necessary to attach the excavation member that does not require a dedicated drive source to the rotary press-fitting machine A and use it. Pile can be constructed with a press-fitting machine, and even if an underground obstacle such as a concrete structure appears, there is no need to use an excavator with a dedicated drive source, so construction costs can be reduced and the construction period can be shortened. can.

e) When the number of existing piles is more than the number of existing piles, it becomes possible to carry out continuous operations such as transporting, suspending, and press-fitting new piles on the completed piles. That is, in addition to the rotary press-fitting machine A used in the present invention, all mechanical devices such as a power unit and a crane are made to stand on the existing piles so as to be self-propelled. In this case, since the range of influence of construction is minimized to only the width of the construction machine on the pile, temporary piers and detour roads are not required even in waterside takeoff areas, slopes / irregular lands, narrow areas, and low-altitude areas. Pile press-fitting and underground obstacle removal can be performed in the space.

The above-mentioned construction method of the present invention has been described by giving an example of being used for advance excavation for press-fitting main piles, but further, advance excavation for small-diameter waterproof piles, L-shaped cross-section steel, etc. to be constructed between piles. The present invention can also be applied to.

1 Saddle 2 Slide frame 3 Leader mast 4 Chuck frame 5 Chuck 6 Main cylinder 7 Clamp 10 Grip mechanism 11 Outer casing 12 Grip plate 13 Open / close cylinder 20 Rotation mechanism 21 Bearing 22 External gear 23 Pinion 24 Motor 30 Auger screw 40 With auger head Tube 60 Tube with removable auger head

Claims (3)

It is provided with a press-fitting machine main body having a chuck capable of gripping a cylindrical member, an elevating means for raising and lowering the chuck, and a clamp for fixing the press-fitting machine main body on an existing pile, and the chuck is an underground obstacle. This is a method of removing underground obstacles using a rotary press-fitting machine that has a rotary drive mechanism that grips and rotates an excavation member for excavating a circular vertical hole.
The excavation member includes a pipe body and a pipe body with an excavator having an excavator attached to the lower end of the pipe body.
(I) A setting step in which the outer circumference of the excavation member is gripped by the chuck and the excavation member is set in a rotatable state.
(II) An excavation process in which the excavation member gripped by the chuck is rotated and lowered, and the excavation member is dug into the ground.
(III) A step of raising and pulling out the excavation member after drilling to a predetermined depth , and discharging the crushed material that crushed the underground obstacle .
A method for removing underground obstacles, which comprises removing underground obstacles by repeating the above steps (I) to (III) a required number of times. The method for removing underground obstacles according to claim 1, wherein the length of the pipe body is changed to a length according to the excavation depth. The method for removing underground obstacles according to claim 1 or 2 , wherein a plurality of the pipe bodies are added to secure a required excavation depth.

Images