JP4955478B2 - Pile ground improvement system - Google Patents

Description

The present invention relates to an on-pile ground improvement system that performs ground improvement while supporting itself in a pile row and being independent.

  Conventionally, when performing ground improvement on narrow slopes under elevated roads, slopes such as embankments, or river adjoining areas where the ground is unstable, it is difficult to carry in large construction machines compared to construction on general land, A lot of temporary facilities were installed or other expensive construction methods were adopted.

  Therefore, a construction method capable of improving the ground at a low cost has been developed in such a construction area and disclosed in Patent Document 1. The construction method will be described with reference to FIGS.

  This method is a press-fitting and drawing machine that can press-fit a plurality of casings (stakes) into the ground, self-propelled on the casing row, press-fit a new casing in front or side of the casing row, and then press-fitting and drawing machine Then, while pulling out the rear casing, a drain material is introduced into the casing to form a pile, and then the extracted casing is press-fitted into the front or side of the casing row.

  Specifically, as shown in FIG. 13, first, casings C1 to C5 are press-fitted into the ground to create a casing row. Next, as shown in FIG. 14, the mast 2 of the press-fitting and extracting machine A is reversed 180 degrees, and the chuck C 1 is clamped by the chuck 1. Then, the pipe 3 is inserted into the upper end of the casing C1, and the drain material 10 is put into the casing C1 through the pipe 3. Then, if the casing C1 is pulled out, the pile 10a will be formed in the ground.

  When the pile 10a needs to be consolidated like a compaction pile, the drainage material 10 is tightened with the compacting jack 5 provided in the casing C1, and the pile 10a is formed, and the casing C1 is pulled out. .

  After the casing C1 is pulled out, the mast 2 and the chuck 1 are inverted 180 degrees again while holding the casing C1 with the chuck 1, and positioned at a position adjacent to the casing C5, and the casing C1 is placed in the ground at that position. Press fit. Then, after press-fitting the casing C1, the press-fitting / pulling machine A is self-propelled and moved by one casing in the traveling direction.

By repeating the above operations, a pile row can be formed on the ground without vibration and noise, and the ground can be improved. According to this construction method, it is not necessary to move the machinery on the ground even on soft ground, so construction can be performed without embankment. Therefore, temporary work is not necessary and the construction period can be shortened.
JP-A-2-209518

  By the way, in the above construction method, since the ground improvement is performed using the press-fitting and drawing machine A for piles, the ground can be improved linearly with a narrow width, but the ground improvement over a wide range with a wide width cannot be performed. There wasn't. In addition, if it is going to perform ground improvement over a wide range with a wide width, a casing (pile) will become large and a machine will also be enlarged. In addition, changing the casing row is subject to restrictions on ground improvement conditions.

In view of the above circumstances, the present invention provides a small and inexpensive pile top ground improvement system capable of changing a pile row according to construction conditions and capable of performing ground improvement over a wide range with a wide width. For the purpose.

The invention of claim 1 is a pile-up ground improvement system that performs ground improvement using a pile row as a scaffold, and a work machine deployed at a rear portion in a traveling direction of the ground improvement on the pile row built in advance, and the pile A pile press-fitting machine arranged at the front in the advancing direction of ground improvement on the row, wherein the working machine is self-supporting on the pile row by clamping the upper part of the pile row, and switches the clamping position. A base portion movable along the pile row, a swivel provided on the base portion so as to be horizontally turnable, a leader supported in a posture perpendicular to the swivel, and along the leader Elevating and lowering body that moves up and down, and a rotating device provided on the lifting body, a function for performing ground improvement by using the lifting and lowering operation of the lifting and lowering body and the rotation operation by the rotating device, and the raising and lowering operation of the lifting body Using the pile row The pile press-in machine is self-supporting on the pile row by clamping the upper part of the pile row, and switching the position of the clamp along the pile row. It is movable and has the function to press-fit the pile pulled out with the said working machine ahead of a pile row.

Invention of Claim 2 is the pile ground improvement system of Claim 1 , Comprising: The said turntable is equipped with the said base part so that attachment or detachment is possible, It is characterized by the above-mentioned.

According to the first aspect of the present invention, a self-propelled working machine and a pile press-in machine are disposed at the rear and front of the pile row, respectively. Since the same type is used, the position of the leader can be moved with a large turning radius, and the work is repeated while changing the position of the leader by rotating the swivel base, thereby improving the ground over a wide range over a wide range. Can be performed on the pile. In addition, by adjusting the fixed position of the base part of the work machine in small increments or adjusting the position of the swivel base or leader, the pitch at the center position for ground improvement can be arbitrarily changed regardless of the pile pitch. Therefore, it is possible to improve the quality of ground improvement. Furthermore, since the pile row is used as a scaffold for the working machine for improving the ground, the pile row can be easily changed according to the conditions of the ground improvement.

According to the invention of claim 2 , since the swivel base can be separated from the base part, the equipment above the swivel base can be shared with other machines only by using only the base part as dedicated equipment. it can. Therefore, an increase in cost can be avoided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a ground improvement system on a pile according to an embodiment, and is a side view showing a state at the time of ground improvement, FIG. 2 is a side view of the working machine in the embodiment, and FIG. And FIG. 4 is a plan view showing a part of the work area when working while moving the work machine, and FIG. 5 is a pile upper ground improvement system according to the embodiment. FIG. 6 is a side view showing a state in which the pile at the rear end is pulled out after the ground improvement, and FIG. 6 is a diagram showing the configuration of the connecting portion between the base portion of the working machine and the swivel base in the embodiment. 7 is a plan view showing a state when an operation for releasing the connection of the connecting portion is performed, FIG. 8 is a side view showing a partial cross section in the state of FIG. 6, and FIG. The side view shown as a partial cross section in the state of this, FIG. 10 is from the swivel base in the said working machine. It is a side view showing a state attached to the crawler truck to remove the portion of the side.

  As shown in FIG. 1, this pile top ground improvement system is a pile top ground improvement device deployed at the rear in the direction of progress of ground improvement (in the direction of arrow A in the figure) on a pile row 100 built in advance. Crane as a work machine 20, a pile presser 40 disposed in the front in the direction of ground improvement on the pile row 100, and a pile 101 transfer machine provided between the work machine 20 and the pile presser 40 60.

  As shown in FIG. 2, the working machine 20 includes a base portion 21, a swivel base 24 provided on the base portion 21 so as to be horizontally pivotable, and a leader 25 supported in a posture perpendicular to the swivel base 24. A lifting body 26 that moves up and down along the leader 25 and a rotating device (not shown) provided on the lifting body 26 are provided. The swivel base 24 is detachably attached to the base portion 21 via a detachable connecting means 23.

  As shown in FIGS. 6 to 9, the detachable connecting means 23 includes a flange 23 </ b> A on the base portion 21 side, a flange 23 </ b> B on the swivel base 24 side, and a C-shaped cross section that can hold both the flanges 23 </ b> A and 23 </ b> B. The swivel base 24 can be firmly connected to the base portion 21 by fastening both the flanges 23A and 23B together and tightening with the connecting ring 80. The swivel base 24 can be detached from the base portion 21 by pulling 23B away.

  Moreover, the base part 21 of the work machine 20 can stand on the pile row 100 by clamping the upper part of the pile row 100, and can move along the pile row 100 by switching the clamping position. A plurality of clamps 22 are provided at the bottom.

  Although the method of moving the base portion 21 by switching the plurality of clamps 22 is a known method, briefly described, for example, the first group of clamps and the second group of clamps can be slid in each other in the advancing direction. In addition, after being provided on the first base and the second base which can be freely jacked up, the second group clamps are released while the first group clamps are self-supporting, and the second bases are jacked up and slid. Then, the second clamp is brought into the clamped state at the next position by jacking down. Next, the first group of clamps is opened and the same operation is performed. Thereby, one movement is completed. Here, the base portion 21 can be moved in smaller steps (for example, 1 cm level) than the pitch of the piles 101.

  The working machine 20 can improve the ground while rotating the rod 27 and the blade 28 at the tip thereof by using the lifting and lowering operation of the lifting body 26 and the rotating operation by the rotating device. As shown in FIG. 5, the pile 101 at the rear end of the pile row 100 can be pulled out via the engaging means 29 by using the raising operation of the elevating body 26.

  Since the leader 25 is supported at the tip of the swivel base 24, it can be swung with a large radius. As shown in FIG. By changing the operating position of the body 26, the ground improvement zone WR can be continued with a large radius.

  Therefore, as shown in FIG. 4, the ground improvement area WR is made continuous by the movement of the work machine 20, whereby a wide range of ground improvement can be performed with a wide width.

  The pile press-in machine 40 is self-supporting on the pile row by clamping the upper portion of the pile row 100, and is movable along the pile row 100 by switching the position of the clamp, and includes a plurality of clamps 42. A base portion 41 and a mast 45 for press-fitting the pile 101 pulled out by the work machine 20 into the front of the pile row 100 are provided. The method of moving the pile presser 40 is the same as that of the work machine 20.

  Moreover, the crane 60 is for handing over the pile 101 pulled out by the work machine 20 to the pile press-in machine 40, and can be self-supported on the pile row by clamping the upper part of the pile row 100. It can move along the pile row 100 by switching. Accordingly, in addition to the base portion 61 having a plurality of clamps 62 as well as the work machine 20, a swivel base 64 that is a normal equipment as a crane, and a boom that is tiltably and telescopically supported by the swivel base 64. 65 or the like.

  When the ground improvement work is performed, several piles 101 are press-fitted in advance to form a pile row 100, and the work machine 20, the pile press-in machine 40, and the crane 60 are mounted thereon, as shown in FIG. When the ground is improved by the work machine 20 behind the row, as shown in FIG. 5, the pile 101 at the rear end of the row is extracted. The removed pile 101 is transferred to the pile presser 40 by the crane 60, and the pile 101 is press-fitted in front of the row by the pile presser 40. This creates a new scaffold. And the ground improvement can be performed using a fixed number of piles 101 by repeating the above operation.

  As the pile 101 in this case, a steel sheet pile can be generally used, but other piles may be used.

  As mentioned above, according to the pile ground improvement system of the said structure, the self-propelled working machine 20 and the pile press-in machine 40 are arrange | positioned at the rear part and the front part of the pile row | line | column 100, respectively, Since the same kind of general ground improvement machine equipped with 24 and leader 25 is used, the position of leader 25 can be moved with a large turning radius, and as a result, wide ground improvement over a wide range can be achieved. This can be done on the pile row 10. Further, by adjusting the fixing position of the base portion 21 of the work machine 20 in small increments or adjusting the positions of the swivel base 24 and the leader 25, the pitch of the center position for ground improvement regardless of the pitch of the pile 101. Therefore, it is possible to improve the quality of ground improvement.

  In addition, since the swivel base 24 can be separated from the base part 21, the equipment above the swivel base 24 can be shared with other machines only by using only the base part 21 as dedicated equipment. For example, as shown in FIG. 10, if it attaches to the crawler trolley | bogie 200, it can also use for the ground improvement work in another field.

  Moreover, since the crane (delivery machine) 60 for delivering the extracted pile 101 to the pile presser 40 is provided between the rear working machine 20 and the front pile presser 40, the work machine Even when the pile 101 cannot be delivered only by turning the 20 swivel base 24, the pulled pile 101 can be reliably delivered to the pile press-in machine 40. Therefore, even if the pile row 100 is long, a smooth operation can be performed.

  Furthermore, when the length of the pile row 100 is short, the pile 101 used for the pile row 100 can be easily pulled out using the leader 25 of the work machine 20, and the reversing of the swivel base 24 of the work machine 20 It is also possible to deliver the pulled-out pile 101 to the pile press-in machine 40, in which case the crane 60 can be omitted.

  Furthermore, by using the pile row 100 having the cross-sectional strength and the pile length sufficient to arrange and work the work machine 20 and the pile press-fit machine 40, it is possible to keep the pile material used as a scaffold (temporary) to the minimum necessary configuration. it can. As a result, cost can be reduced. Moreover, since a small pile material can be used compared with the casing etc. which consist of the conventional steel pipe materials, the compact pile press-in machine 40 can be used and cost can be reduced by that much.

  Furthermore, by setting the pile length of the pile row 100 shorter than the depth at which ground improvement is performed, it is not necessary to use a casing for ground improvement as before, and the pile length is sufficient to install and work on the system. And cost can be reduced accordingly.

  Furthermore, by using a U-shaped steel sheet pile as the pile 101 used for the pile row 100, the cost becomes lower than that of a conventional casing or the like, and the cost can be reduced accordingly.

  In addition, the advancing direction of the ground improvement on the pile row 100 by the pile top ground improvement system is not limited to the A direction shown in FIG. 2, but the B direction indicated by the arrow in FIG. 11 (the direction opposite to the traveling direction A in FIG. 2) The working machine 20 may be moved to improve the ground. Furthermore, as shown in FIG. 12, the ground improvement may be performed in a direction perpendicular to the traveling direction A or B while moving and turning the work implement 20 in the front-rear direction. In this case, the pile 101 may be left embedded in the ground improvement region. Furthermore, it is needless to say that the embodiment can be applied to ground improvement by sand piles or the like by supplying sand or the like to the work machine 20.

This invention is a figure which shows the structure of the ground improvement system on a pile of embodiment, and is a side view which shows the state at the time of ground improvement. It is a side view of the working machine in the embodiment. It is a top view which shows the structure of the working machine, and its working area (ground improvement range). It is a top view which shows a part of work area | region at the time of working, moving the working machine. It is a figure which shows the structure of the pile top ground improvement system of the embodiment, Comprising: It is a side view which shows the state which has extracted the pile of the rear end after ground improvement. It is a top view at the time of the connection which shows the structure of the connection part of the base part of the working machine in the same embodiment, and a turntable. It is a top view which shows the state when operation for the connection cancellation | release of the connection part is performed. It is a side view shown as a partial cross section in the state of FIG. It is a side view shown as a partial cross section in the state of FIG. It is a side view which shows the state which removed the upper part from the swivel stand in the said working machine, and attached to the crawler trolley | bogie. It is a side view of the working machine in the case of improving the ground in the direction opposite to the traveling direction of FIG. It is a top view which shows a part of work area | region in the case of performing ground improvement to a perpendicular direction with respect to the advancing direction, moving the said working machine to the front-back direction, and turning. It is sectional drawing for description of the conventional construction method. It is sectional drawing which shows the state in another work in the construction method.

Explanation of symbols

100 pile row 101 pile 20 working machine (pile upper ground improvement device)
21 Base part 22 Clamp 23 Connection means 24 Turntable 25 Leader 26 Lifting body 40 Pile press-fit machine 60 Crane (delivery machine)

Claims (2)

In the ground improvement system for piles that improves the ground using the pile row as a scaffold,
A working machine deployed in the rear in the direction of progress of ground improvement on the pile row that has been built in advance, and a pile presser deployed in the front in the direction of progress of ground improvement on the pile row ,
The working machine is self-supporting on the pile row by clamping the upper portion of the pile row, and is capable of moving horizontally along the pile row by switching the clamping position and horizontally turning to the base portion. A swivel provided on the swivel, a reader supported in a posture perpendicular to the swivel, a lift that moves up and down along the leader, and a rotating device that is provided on the lift. It has a function of performing ground improvement by using a lifting operation and a rotating operation by the rotating device, and a function of pulling out a pile at the rear end of the pile row using a lifting operation of the lifting body,
The pile presser is self-supporting on the pile row by clamping the upper part of the pile row, and is movable along the pile row by switching the position of the clamp, and the pile pulled out by the working machine A pile-up ground improvement system characterized by having a function of press-fitting to the front of the pile row . It met pile on ground improvement system of claim 1,
The pile ground improvement system, wherein the swivel base is detachably attached to the base portion .

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