JP2016056632A - Steel pipe pile press-in device and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe pile press-in device, installable by a machine up to a jack, a stroke adjustment material and an extension steel pipe material, without requiring to install a heavy cargo by man-power as compared with a conventional method.SOLUTION: A steel pipe pile press-in device comprises a hydraulic jack 20 and a jack unit 30 for installing the hydraulic jack 20 by turning a cylinder downward, and the jack unit 30 comprises a claw insertion hole into which a claw of a lift possessed by a vehicle system construction machine 50 enters, and the vehicle system construction machine 50 having the lift with a claw 50N moves up to a place under a building by carrying a steel pipe pile by the steel pipe pile press-in device by inserting the claw 50N of the lift into the claw insertion hole, and the steel pipe pile is pressed in underground by the hydraulic jack 20 held by the jack unit 30.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steel pipe press-fitting device and a method for press-fitting a steel pipe pile into the soil when performing a structure underpinning method for constructing a heavy object such as a building or when constructing an existing foundation reinforcement or the like. It is about.

<Conventional steel pipe pile press-in method>
Conventionally, as this type of steel pipe pile press-in method, for example, there is a steel pipe pile press-in method as described in Patent Documents 1 to 3.

JP2013-57214A JP 2006-637111 A Japanese Patent Publication No. 06-43224

<Conventional steel pipe pile press-in method>
In the conventional steel pipe pile press-in method, a hydraulic jack is installed at the lower end of the existing foundation, and the steel pipe pile tip is pressed into the support ground using the building's own weight as a reaction force.
FIG. 9 is a diagram for explaining a conventional method for press-fitting a steel pipe pile, and is a view for explaining a process until a steel pipe pile set up in the ground is press-fitted into the ground, and another steel pipe pile is added and welded.

<Step 1>
In FIG. 9 (1), the hydraulic jack J is reversed and fixed with an anchor under the foundation B of a heavy building (driving body) such as a building.
<Step 2>
After transporting the steel pipe pile J1 to the position immediately below the hydraulic jack J in FIG. 9 (1) and raising it, the cylinder Js of the hydraulic jack J is extended as shown in FIG. 9 (2) and the steel pipe pile K1 is pushed downward. Press fit into the ground G.
<Step 3>
After press-fitting the steel pipe pile K1 into the soil G, return the cylinder Js of the hydraulic jack J to its original position, create a gap between the hydraulic jack J and the steel pipe pile K1, and insert the adjusting material S1 into the gap. It mounts on the steel pipe pile K1 like FIG. 9 (3).
<Step 4>
In FIG. 9 (4), the cylinder Js of the hydraulic jack J is extended and the adjusting material S1 is pushed downward, so that the steel pipe pile K1 is further pressed into the soil G by the length of the adjusting material S1.
<Step 5>
In FIG. 9 (5), the cylinder Js of the hydraulic jack J is returned to the original position, and a gap is formed again between the hydraulic jack J and the adjusting material S1.
<Step 6>
In FIG. 9 (6), another adjusting material S2 is placed on the adjusting material S1.
<Step 7>
In FIG. 9 (7), by extending the cylinder Js of the hydraulic jack J and pushing the adjusting material S2 downward, the steel pipe pile K1 is further pressed into the soil G by the length of the adjusting material S2.
<Step 8>
This is repeated thereafter. That is, the adjustment material S3 is placed on the adjustment material S2, and the adjustment material S3 is pushed downward, and the steel pipe pile K1 is further press-fitted into the soil G by the length of the adjustment material S3. Then, the adjustment material S4 is placed and the adjustment material S4 is pushed downward, and the steel pipe pile K1 is further press-fitted into the soil G by the length of the adjustment material S4.
Thereafter, the adjusting materials S1 to S4 are removed from under the hydraulic jack J, and a new steel pipe pile K2 is placed on the steel pipe pile K1. FIG. 9 (8) shows a state where the adjustment materials S1 to S4 are removed from under the hydraulic jack J and a new steel pipe pile K2 is about to be placed on the steel pipe pile K1.
<Step 9>
After the joints of the steel pipe pile K2 and the steel pipe pile K1 are integrated by welding, the cylinder Js of the hydraulic jack J is extended and the steel pipe pile K2 is pushed downward. It is press-fitted into the G in the soil. FIG. 9 (9) shows a state in which the steel pipe pile K2 and the steel pipe pile K1 are press-fitted into the soil G by the stroke of the cylinder Js.

<Step 10>
Since the same thing as what was demonstrated above is repeated after this, illustration is omitted. In Step 10, when the cylinder Js of the hydraulic jack J is returned to the original position from the state shown in FIG. 9 (9), a gap is formed between the hydraulic jack J and the steel pipe pile K2. Therefore, as shown in Step 3, the adjusting material S1 is placed on the steel pipe pile K2 (although the adjusting material S1 is placed on the steel pipe pile K1 in FIG. 9 (3)), and the hydraulic jack is used as in Step 4. The cylinder Js of J is extended and the adjustment material S1 is pushed downward, the cylinder Js of the hydraulic jack J is returned to the original position as in Step 5, and the adjustment material S2 is placed on the adjustment material S1 as in Step 6. Then, as shown in step 7, the cylinder Js of the hydraulic jack J is extended to push the adjustment material S2 downward. Finally, after the adjustment material S4 is pushed downward and the steel pipe pile K2 is press-fitted into the soil G by the length of the adjustment material S4, the adjustment materials S1 to S4 are removed from under the hydraulic jack J, and FIG. As shown in (8), after placing the new steel pipe pile K3 on the steel pipe pile K2 and welding the joint between the steel pipe pile K3 and the steel pipe pile K2, the steel pipe pile K3 was pushed down and welded. The three steel pipe piles K3, K2, and K1 became one long steel pipe pile and were press-fitted into the soil.
Each time Step 10 is repeated once, one steel pipe pile is newly press-fitted, so a desired number of steel pipe piles can be obtained by repeating Step 10 until the number of steel pipe piles to be press-fitted into the soil is reached. Can be pressed into the soil.

All of the above work was done manually. In other words, work to install a hydraulic jack on the foundation of the building, attach an anchor to a lying steel pipe pile, hang a wire and raise it with a chain block, etc. The work of fine adjustment, the work of placing the adjustment member on the steel pipe pile, and the work of placing another steel pipe pile on the steel pipe pile are all done manually, increasing the size of the building and reducing the labor force. While there are concerns, etc., safety work and labor saving work have been demanded. In the conventional method, it takes time to attach and detach the hydraulic jack, so it is necessary to prepare a large number of hydraulic jacks and attach them in advance. Accordingly, since the hydraulic jack cannot be easily removed, the hydraulic jack cannot be diverted to the press-fitting work at another place during the welding time, and the press-fitting work becomes a waiting time.
The present invention has been made to solve such problems, and an object thereof is to provide a device and a method capable of promoting the mechanization of the steel pipe pile press-fitting work and press-fitting the steel pipe pile safely and efficiently.

In order to solve the above problems, the present inventions (1) to (11) are characterized by the following.
(1) A steel pipe pile press-fitting device comprising a hydraulic jack and a jack unit to which the hydraulic jack is attached with a cylinder facing downward, wherein the jack unit is attached to a vehicle construction machine. .
(2) The steel pipe pile press-fitting device according to the above (1), wherein the jack unit has a structure to be attached to a lift claw provided in a vehicle construction machine.
(3) The steel pipe pile press-fitting device according to (2), wherein the structure is a claw insertion hole into which the claw enters.
(4) The steel pipe pile press-fitting device according to any one of (1) to (3), wherein the jack unit includes a mechanism capable of adjusting an omnidirectional angle.
(5) The jack unit includes a mechanism capable of adjusting a position in one direction on a plane perpendicular to a steel pipe pile press-fitting direction, according to any one of the above (1) to (4), Steel pipe pile press-fitting device.
(6) The above-mentioned (1), characterized in that a hat-type stroke adjusting material in the shape of a top hat composed of a cylindrical portion and a heel surrounding the entire periphery of the tip of the cylindrical portion is fixed to the tip of the cylinder of the hydraulic jack. The steel pipe pile press-fit apparatus in any one of-(5).
(7) The outer diameter of the cylindrical portion is smaller than the inner diameter of the target steel pipe pile, and the outer diameter of the rod is larger than the inner diameter of the steel pipe pile, thereby inserting the cylindrical portion into the hole of the steel pipe pile. The steel pipe pile press-fit as set forth in (6) above, wherein the flange is in contact with an edge of the steel pipe pile and the cylindrical portion is prevented from being inserted into the hole of the steel pipe pile any more. apparatus.
(8) In a vehicle construction machine having a lift with a claw, the claw of the lift is inserted into the claw insertion hole of the steel pipe pile press-fitting device according to (3), and the steel pipe pile press-fitting device is moved up and down. A vehicle-type construction machine with a steel pipe pile press-in device, which is capable of performing.
(9) In the steel pipe pile press-in method for press-fitting a steel pipe pile into the soil under the building using the steel pipe pile press-in device described in (6) or (7) above,
Extending the cylinder of the hydraulic jack, inserting the cylindrical portion of the hat-type stroke adjusting material at the tip of the cylinder into the hole of the steel pipe pile, and fixing the steel pipe pile;
Transporting the steel pipe pile to just below the target building and standing the steel pipe pile at the press-fit position;
And a step of press-fitting the steel pipe pile into the soil with the hat-type stroke adjusting material by extending the cylinder.
(10) Subsequent to the step of the method for press-fitting a steel pipe pile according to (9) above, the cylinder is returned to its original position, another steel pipe pile is placed on the press-fitted steel pipe pile, and both are welded. And steps to
The step of extending the cylinder and press-fitting the welded another steel pipe pile into the soil with the scissors of the hat-type stroke adjusting material;
The steel pipe pile press-in method characterized in that the steel pipe pile and the another steel pipe pile are vertically connected and press-fitted into the soil.
(11) Following the step of press-fitting the steel pipe pile into the soil with the scissors of the hat-type stroke adjusting material in the steel pipe pile press-in method according to (9) or (10) above,
Returning the cylinder and placing an iron plate on the press-fitted steel pipe pile;
Extending the cylinder, pressing the steel plate downward at the tip of the cylindrical portion of the hat-type stroke adjusting material, and further pressing the steel pipe pile press-fitted into the soil into the soil. Steel pipe pile press-in method characterized by

According to the steel pipe pile press-fitting device of the present invention, a jack and a steel pipe material, which are heavy objects, and a stroke adjusting material are simply attached to a highly versatile vehicle construction machine, and the press-fitting position is adjusted so that the omnidirectional angle can be adjusted. Construction can be performed with high accuracy. Therefore, compared to the conventional method, it is not necessary to manually install heavy objects, and it is possible to install jacks, stroke adjusting materials, and additional steel pipes with machines. In addition, simplification of refilling work and welding work are possible. Can also be reduced. In addition, it can be constructed safely and can save labor.
According to the steel pipe pile press-fitting method of the present invention, a jack and steel pipe material, which are heavy objects, and a stroke adjusting material are simply attached to a highly versatile vehicle construction machine, and the press-fitting position is adjusted so that the omnidirectional angle can be adjusted. Construction can be performed with high accuracy. Therefore, compared to the conventional method, it is not necessary to manually install heavy objects, and it is possible to install jacks, stroke adjusting materials, and additional steel pipes with machines. In addition, simplification of refilling work and welding work are possible. Can also be reduced. In addition, it can be constructed safely and can save labor.
In addition, in order to press-fit a steel pipe pile, conventionally, a space more than the sum of "height of hydraulic jack" and "height of steel pipe pile" is required between the building foundation and the ground. By using the stroke adjusting material and the steel plate, it is possible to perform press-fitting work in a narrow space that is the sum of the height of the hydraulic jack-the length of the stroke adjusting material that enters the steel pipe pile and the height of the steel pipe pile. become.

FIG. 1 is a perspective view of a steel pipe pile press-fitting device according to the present invention. FIG. 2 is a three-view diagram of a steel pipe pile press-fitting device with a hat-type adjuster in which a hat-type stroke adjuster according to the present invention (hereinafter abbreviated as “hat-type adjuster”) is attached to the steel pipe pile press-fitting device of FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a side view. FIG. 3 is a three-side view when the steel pipe pile press-fitting device with a hat-type adjusting material is attached to a forklift, FIG. 3 (A) is a plan view, FIG. 3 (B) is a front view, and FIG. 3 (C) is a side view. is there. is there. FIGS. 4-8 is a figure explaining until it press-fits three steel pipe piles using the steel pipe pile press-fitting apparatus with a hat type adjustment material which concerns on this invention, FIG. 4 is the step (1)-(4). And it is a conceptual diagram until it press-fits the 1st steel pipe pile in half underground. FIG. 5 is a conceptual diagram until all the first steel pipe piles are press-fitted into the ground in the steps (5) to (8). FIG. 6 is a conceptual diagram of steps (9) to (12) until the second steel pipe pile is half-pressed into the ground. FIG. 7 is a conceptual diagram until all the second steel pipe piles are press-fitted into the ground in steps (13) to (16). FIG. 8 is a conceptual diagram of the steps (17) to (20) until all the third steel pipe piles are press-fitted into the ground, and the steel pipe pile press-fitting device with a hat-type adjusting material according to the present invention leaves the site. It is. FIG. 9 is a diagram for explaining a conventional method for press-fitting steel pipe piles.

Hereinafter, a steel pipe pile press-fitting device according to the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a steel pipe pile press-fitting device according to the present invention, and FIG. 2 is a three-side view of the steel pipe pile press-fitting device with a hat type adjusting material according to the present invention.

<Steel pipe pile press-fitting device 1 with a hat type adjusting material according to the present invention>
In FIG. 1, a steel pipe pile press-fitting device 1 with a hat-type adjusting material according to the present invention includes a steel pipe pile press-fitting device 10 and a hat-type adjusting material 40.

<Steel pipe pile press-in device 10>
The steel pipe pile press-fitting device 10 includes a hydraulic jack 20 and a jack unit 30 that holds the hydraulic jack 20.
Since the steel pipe pile press-fitting device 10 includes the jack unit 30 described below, a heavy-duty hydraulic jack 20, steel pipe pile K1, and hat-type stroke adjusting material 40 are combined with a highly versatile vehicle construction machine (forklift or Backhoe or the like) 50 can be easily attached, and the press-fitting position can be adjusted so that the omnidirectional angle of the steel pipe pile press-fitting device 10 can be adjusted, so that construction can be performed with high accuracy.

<Hydraulic jack 20>
The hydraulic jack 20 used here may be anything as long as it has a structure in which hydraulic oil is sent from the hydraulic pump into the jack body via the hydraulic hose to extend the cylinder 20S, but a double-acting hydraulic jack is particularly recommended. The The reason for this is that when a hydraulic jack is used upside down as in this case, and a hat type adjuster is attached that has a certain amount of weight, even if the pressure on the extension side is released, the internal spring does not return. there is a possibility. Therefore, a double-acting hydraulic jack, which is a jack that feeds oil to the return side of the cylinder and returns the cylinder by hydraulic pressure, is optimal in this case.

<Jack unit 30>
The jack unit 30 includes an omnidirectional angle adjusting mechanism and an X-direction position adjusting mechanism according to the present invention. Hereinafter, the omnidirectional angle adjustment mechanism and the X direction position adjustment mechanism will be described.

<All-direction angle adjustment mechanism of jack unit 30>
Rotating shafts 31A and 31A are respectively fixed to the two hydraulic jack gripping devices 31 and 31 that sandwich and grip the cylindrical portion of the hydraulic jack 20 from both sides, and the rotating shafts 31A and 31A are frame-shaped rectangular frames. The bearings 32 </ b> A and 32 </ b> A attached to two opposing side surfaces of 32 are rotatably accommodated.
In addition, the rotating shafts 32A and 32A are respectively fixed to the two opposite side surfaces of the rectangular frame 32 to which the rotating shafts 31A and 31A are not attached, and the rotating shafts 32A and 32A are the bases. It is rotatably accommodated in bearings 33A and 33A attached to the upper parts of the frames 33 and 33 by attachment members 33B and 33B, respectively. Thus, since the hydraulic jack 20 can rotate around the rotation shaft 31A and can rotate around the rotation shaft 32A, the omnidirectional angle can be adjusted.
Since the jack unit 30 can automatically adjust the angle of the hydraulic jack in all directions, the steel pipe pile can always be held vertically even if the forklift 50 is tilted or the foundation of the building is tilted.

<< X-direction position adjustment mechanism of jack unit 30 >>
The bearing 32A that rotatably supports the rotating shaft 31A can be moved in the horizontal direction by the following linear motion device 32S provided on the side surface of the frame-like rectangular frame 32. That is, a rail 32R is laid in the horizontal direction at the inner bottom of the rectangular frame 32K constituting the linear motion device 32B, and the bearing 32A is placed on the rail 32R. The bearing 32A has a threaded hole 32H penetrating in the horizontal direction, and a long threaded shaft 32N threaded through the threaded hole 32H is supported by two opposite faces of the rectangular frame 32K. And is rotatably provided. Further, the shaft 32A is rotatably supported by the bearing 32A at a portion that does not interfere with the screw hole 32H. Therefore, the bearing 32A moves in one direction on the rail 32R by rotating the screw shaft 32N in a predetermined direction, and the bearing 32A moves in the opposite direction by rotating the screw shaft 32N in the opposite direction. It becomes like this. Accordingly, the rotating shaft 31A supported in the bearing 32A also moves, and the hydraulic jack gripping device 31 also moves. The screw shafts 32N are provided on the opposite side surfaces of the jack unit 30, respectively.
Thus, since the jack unit 30 can adjust the position of the hydraulic jack in the X direction of the jack unit 30, the forklift 50 stops slightly shifted from the predetermined press-fitted position in the X direction (lateral width direction of the forklift 50). Since the jack unit 30 can be adjusted to a predetermined position by rotating the screw shaft 32N, the forklift 50 does not have to be re-worked. .

<Adjusting the Y-direction position of the jack unit 30>
Further, when the vehicle stops slightly deviating in the Y direction (traveling direction of the forklift 50), the forklift 50 only needs to be moved forward / backward, so that it can be easily adjusted.

<Hat type adjusting material 40>
A hat-type stroke adjusting material according to the present invention (hereinafter simply referred to as “hat-type adjusting material”) is employed at the tip of the cylinder 20S of the hydraulic jack 20 of the steel pipe pile press-fitting device 10. The hat-type adjusting member 40 has a top hat shape including a cylindrical portion 40S and a heel 40T (rib) surrounding the periphery of the tip of the cylindrical portion 40S. The outer diameter of the top hat cylindrical portion 40S is smaller than the inner diameter of the target steel pipe pile, and the outer diameter of the top hat collar 40T is selected larger than the inner diameter of the steel pipe pile. Then, the tip of the cylinder 20S is inserted into the cylindrical portion (sheath tube) of the top hat, the tip of the cylinder 20S is bolted to the bottom of the cylindrical portion (the top of the cap), and the tip of the cylinder 20S ( That is, the shape of the top portion of the steel pipe pile can be secured by inserting the cylindrical portion of the top hat). The steel pipe pile can be press-fitted by installing a circular plate (鍔 40T) larger than the outer diameter of the steel pipe pile at the rear end of the sheath pipe.
Therefore, when the cylindrical portion of the top hat is immersed in the hole of the steel pipe pile, the top 40T of the top hat collides with the edge of the steel pipe pile and further insertion is prevented.
Therefore, first, the cylindrical portion of the top hat is inserted into the steel pipe pile, and the steel pipe pile is pushed in with the top 40T of the top hat, and then the steel plate pile is covered with the steel plate pile so that the cylindrical portion of the top hat is the steel pipe pile. By inserting the steel pipe pile with the cylindrical portion of the top hat so that it is not inserted into the hole, the steel pipe pile having a length corresponding to the two strokes of the cylinder 20S can be pushed in. It is possible to reduce the number of times and increase the length of the steel pipe pile up to the length of two strokes, and since a long steel pipe pile can be used, it is possible to reduce the number of welding points for joining many conventional short steel pipe piles. In addition, the number of adjustment material replacements can be reduced.
Moreover, if an adjustment material is separately connected as described above, the number of replacements can be further reduced.

<Attaching the jack unit 30 to the vehicle construction machine>
According to the present invention, the claw insertion hole 30N into which the claw of the forklift or hand lifter can enter is provided below the jack unit 30. Therefore, when the hydraulic jack 20 is installed at the steel pipe pile press-fitting position, the forklift 50 which is various vehicle construction machines. It is a highly versatile attachment method that can be attached to both power shovels and hand lifters.
For the power shovel, the claw 50N at the tip of the shovel or the shovel may be removed and the jack unit 30 may be attached to the arm tip instead.
The jack unit 30 is inserted and fixed to the claw 50N at the tip of the forklift 50, and is moved to the press-fitting position by the movement of the forklift 50.
Hereinafter, an example in which the forklift 50 is placed will be described.

<Forklift 50>
FIG. 3 shows an example in which the steel pipe pile press-fitting device 1 with a hat type adjusting material according to the present invention is placed on a forklift 50. The steel pipe pile press-fitting device 1 with a hat-type adjusting material is provided with a claw insertion hole 30N into which the claw 50N of the forklift 50 can enter under the jack unit 30. By passing the claw 50N of the forklift 50 through the claw insertion hole 30N, the steel pipe pile press-fitting device 1 with a hat type adjusting material is attached to the forklift 50, and the forklift 50 is located under the place where the steel pipe piles are stacked horizontally and under the building. And the steel pipe pile K1 can be easily carried under the building.
As described above, when the steel pipe pile press-fitting device 1 with a hat type adjusting material according to the present invention is placed on a vehicle construction machine, the steel pipe pile K1 to be added is built from a flat state to a built-in state and a press-in jack is installed. Can be constructed at the same time, which is convenient.
In addition, it is not necessary to manually install heavy objects, and it is possible to install hydraulic jacks, stroke adjusting materials, and additional steel pipes on machines, and it is possible to simplify refilling work and reduce welding work. .
In the conventional construction method, since the hydraulic jack is fixed to the foundation of the building, press-fitting work is not performed during welding, resulting in a waiting time. In the present invention, the hydraulic jack is moved to another press-fitting location during welding so that the press-fitting work at the other location can be performed even during welding. This makes it possible to construct a plurality of steel pipe piles with a small number of hydraulic jacks. Furthermore, the stroke of the hydraulic jack can be lengthened, and the number of times of use of the adjusting material can be reduced.
As shown above, according to the present invention, the addition of the hat-type adjusting material 40 during the construction of the steel pipe pile can improve the efficiency and labor saving of the construction work of the next steel pipe pile, Safe work can be done.

<How to use the steel pipe pile press-fitting device 10 according to the present invention>
Hereinafter, the procedure of press-fitting a plurality of steel pipe piles using the steel pipe pile press-fitting device 1 with a hat-type adjusting material according to the present invention will be described with reference to FIGS.

4 (1), the forklift 50 in which the claws 50N of the forklift 50 are inserted into the claw insertion holes of the steel pipe pile press-fitting device 1 with a hat-type adjusting material and the steel pipe pile press-fitting device 1 with a hat-type adjusting material is attached as shown in FIG. 50 is moved to the place where the steel pipe pile K1 is horizontally stacked, the claws 50N of the forklift 50 are moved up and down, and the steel pipe pile press-fitting device 1 with a hat type adjusting material is swung, so that the hat type adjusting material 40 Is inserted into the hole of the steel pipe pile K1. In the following drawings, the forklift 50 is not shown in order to make it easier to see the movement of the steel pipe pile press-fitting device 1 with a hat-type adjusting material.
Then, when the hat type adjusting material 40 is inserted into the hole while standing the steel pipe pile K1 with the forklift 50, the steel pipe pile K1 finally stands upright, and the flange 40T of the hat type adjusting material 40 is attached to the steel pipe pile K1. Abuts the upper end. In this state, the collar 40T of the hat-type adjusting member 40 and the upper end of the steel pipe pile K1 are fixed so as not to move.

  4 (2), the steel pipe pile K1 is moved to the press-fitting site with the forklift 50 while being fixed with the hat-type adjusting material 40.

  The forklift 50 arrives at the press-fitting site, and in FIG. 4 (3), the upper end of the hydraulic jack is brought into contact with the foundation while the steel pipe pile K1 is fixed with the hat-type adjusting material 40 at the press-fitting position. The steel pipe pile K1 is in a state approaching the ground.

In this state, when the cylinder 20S is extended, the hydraulic jack pressurizes the building's own weight as a reaction force and sequentially press-fits the steel pipe pile K1 into the soil. Therefore, all of the extension of the cylinder 20S is press-fit of the steel pipe pile K1. The steel pipe pile K1 is press-fitted into the ground for one stroke by one stroke of the cylinder 20S.
For example, if one stroke of the hydraulic jack is 50 cm and the length of the steel pipe pile K1 is 1 m, as shown in FIG. 4 (4), the steel pipe pile K1 is 50 cm in one stroke, that is, half of the steel pipe pile K1 is Pressed into the ground.
Of course, in the present invention, if one stroke of the hydraulic jack is 100 cm, the steel pipe pile K1 of 1 m can be entirely press-fitted into the ground in one stroke, but the weight of the hydraulic jack itself becomes excessive. As a result, a large forklift is necessary and not recommended. Therefore, the present invention has the following devices.

  In FIG. 5 (5), the cylinder 20S of the hydraulic jack is moved backward to create a slight gap between the hat-type adjusting member 40 and the steel pipe pile K1.

  In FIG. 5 (6), an iron plate is inserted into the gap between the hat-type adjusting member 40 and the steel pipe pile K1.

In this state, when the cylinder 20S is extended, the steel pipe pile K1 is press-fitted into the soil via an iron plate. Thus, since the steel pipe pile K1 that has been press-fitted only by 50 cm is further press-fitted by one stroke of the hydraulic jack and 50 cm, the whole steel pipe pile K1 is press-fitted into the soil as shown in FIG. 5 (7). Become.
In this way, the hat type adjusting material 40 and the iron plate are prepared, and first the hat type adjusting (without inserting the tip of the hat type adjusting material 40 into the steel pipe pile K1 and using the tip of the hat type adjusting material 40). By pushing down the steel pipe pile K1 with the rod 40T of the material 40, the half of the steel pipe pile K1 is pushed down, and then pushing down the half of the steel pipe pile K1 by pushing the iron plate at the tip of the hat-type adjusting material 40 (1 stroke Even if a 100 cm hydraulic jack is not used, the entire steel pipe pile K1 can be press-fitted.

  Next, when the cylinder 20S is returned, an iron plate remains on the steel pipe pile K1 as shown in FIG.

  Therefore, when the iron plate is removed, as shown in FIG. 6 (9), there is a gap in which another steel pipe pile K2 enters between the flange 40T of the hat-type adjusting material 40 and the steel pipe pile K1.

  4 (1) to (3) again, the next steel pipe pile K2 is taken with the forklift 50 and returned to the press-fitting site with the forklift 50 while being fixed with the hat-type adjusting material 40. FIG. ), Another steel pipe pile K2 is placed right above the steel pipe pile K1, and the upper end of the hydraulic jack is brought into contact with the foundation.

  In this state, the cylinder 20S is slightly extended, and the steel pipe pile K2 is placed on the steel pipe pile K1 as shown in FIG. 6 (11). When the contact surfaces are welded in this state, the steel pipe pile K1 and the steel pipe pile K2 are integrated.

  In this state, when the cylinder 20S is extended again, the steel pipe pile K2 is pushed by the rod 40T of the hat-type adjusting material 40, and all the extension of the cylinder 20S is used for press-fitting the steel pipe pile K2, and one stroke of the cylinder 20S is performed. Then, half of the steel pipe pile K2 is press-fitted into the ground as shown in FIG. 6 (12).

  The cylinder 20S of the hydraulic jack is moved backward to create a slight gap between the hat-type adjusting member 40 and the steel pipe pile K1 as shown in FIG. 7 (13).

  In FIG. 7 (14), an iron plate is inserted into the gap between the hat-type adjusting member 40 and the steel pipe pile K2.

  When the cylinder 20S is extended in this state, the steel pipe pile K2 is press-fitted into the soil via the iron plate. Thus, the two steel pipe piles K1 and K2 are press-fitted into the soil as shown in FIG. 7 (15).

  Next, when the cylinder 20S is returned, an iron plate remains on the steel pipe pile K2 as shown in FIG. 7 (16). Therefore, when the steel plate is removed, there is a space for another steel pipe pile to enter between the flange 40T of the hat type adjusting material 40 and the steel pipe pile K2, so that the forklift 50 takes the next steel pipe pile K3, and the hat type adjusting material. As shown in FIG. 8 (17), when another steel pipe pile K3 is placed immediately above the steel pipe pile K2 and the contact surfaces of the two are welded together, the steel pipe pile K2 and the steel pipe pile K3 are integrated. Become. Therefore, the upper end of the hydraulic jack is brought into contact with the foundation.

  In this state, when the cylinder 20S is slightly extended, the steel pipe pile K3 is pushed by the rod 40T of the hat-type adjusting member 40 as shown in FIG. 8 (18), and the extension of the cylinder 20S is all of the steel pipe pile K3. It is used for press-fitting, and half of the steel pipe pile K3 is press-fitted into the ground by one stroke of the cylinder 20S. At this time, the tip of the hat-type adjusting material 40 is inserted into the steel pipe pile K3 and does not contribute to the current press-fitting.

Therefore, when the cylinder 20S of the hydraulic jack is moved backward, an iron plate is inserted into the gap between the hat-type adjusting member 40 and the steel pipe pile K3, and the cylinder 20S is extended, the steel pipe pile K3 is press-fitted into the soil via the iron plate. . Thus, the three steel pipe piles K1, K2, and K3 are press-fitted into the soil as shown in FIG. 8 (19).
By repeating the above, the required number of steel pipe piles can be pressed into the soil.

  After repeating this operation and press-fitting the steel pipe pile to a predetermined depth, confirm that the tip of the steel pipe pile has arrived at the support ground, as shown in FIG. 8 (20), retreat the cylinder 20S of the hydraulic jack, The forklift 50 carries away the hydraulic jack with the hat-type adjusting material from the site and proceeds to the next process.

<Modification>
In the above embodiment, the jack unit is easily attached to the forklift by providing a claw insertion hole in the jack unit using the forklift claw. However, a backhoe (hydraulic excavator) or the like having no claw is used. In the case of such a vehicle construction machine, an attachment (connection jig) corresponding to the connecting portion may be appropriately created, and the jack unit according to the present invention may be connected thereto.

<Summary>
1) According to the steel pipe pile press-fitting device of the present invention, the heavy jack, steel pipe and stroke adjusting material can be easily attached to a highly versatile vehicle construction machine, and the press-fit position can be adjusted so that the omnidirectional angle can be adjusted. It can be done with high accuracy. Therefore, compared to the conventional method, it is not necessary to install heavy objects manually, and it is possible to install jacks, stroke adjusters, and additional steel pipes with machines. The work can be simplified and the welding work can be reduced. In addition, it can be constructed safely and can save labor.
2) According to the steel pipe pile press-fitting method of the present invention, a heavy jack, steel pipe, and stroke adjuster are simply attached to a general-purpose vehicle construction machine, and the press-fit position can be adjusted so that the omnidirectional angle can be adjusted. It can be done with high accuracy. Therefore, compared to the conventional method, it is not necessary to install heavy objects manually, and it is possible to install jacks, stroke adjusters, and additional steel pipes with machines. The work can be simplified and the welding work can be reduced. In addition, it can be constructed safely and can save labor.
3) Moreover, even if it is a hydraulic jack which has a cylinder with a small stroke only by using an iron plate, it becomes possible to press-fit a steel pipe pile having a length twice that stroke.

1: Steel pipe pile press-fitting device 10 with hat-type stroke adjusting material 10: Steel pipe pile press-fitting device 20: Hydraulic jack 20L: Lock pin 20S: Cylinder 30: Jack unit 30N: Claw insertion hole 40S: Cylindrical portion 40: Hat-type stroke adjusting material ( (Hat type adjuster for short)
40T: Tsubaki
50: Vehicle construction machines (forklifts, etc.)
50N: Claws K1, K2, K3: Steel pipe pile

Claims (11)

  A steel pipe pile press-fitting device, comprising: a hydraulic jack; and a jack unit for mounting the hydraulic jack with a cylinder facing downward, wherein the jack unit is attached to a vehicle construction machine.   The steel pipe pile press-fitting device according to claim 1, wherein the jack unit has a structure to be attached to a lift claw provided in a vehicle construction machine.   The steel pipe pile press-fitting device according to claim 2, wherein the structure is a claw insertion hole into which the claw enters.   The steel pipe pile press-fitting device according to any one of claims 1 to 3, wherein the jack unit includes a mechanism capable of adjusting an omnidirectional angle.   The steel pipe pile press-fitting device according to any one of claims 1 to 4, wherein the jack unit includes a mechanism capable of adjusting a position in one direction on a plane perpendicular to the steel pipe pile press-fitting direction.   6. A hat-type stroke adjusting material in the shape of a top hat composed of a cylindrical portion and a heel surrounding the entire periphery of the tip of the cylindrical portion is fixed to the tip of the cylinder of the hydraulic jack. The steel pipe pile press-fitting device according to claim 1.   The outer diameter of the cylindrical portion is smaller than the inner diameter of the target steel pipe pile, and the outer diameter of the rod is larger than the inner diameter of the steel pipe pile, thereby inserting the cylindrical portion into the hole of the steel pipe pile and The steel pipe pile press-fitting device according to claim 6, wherein the flange contacts the edge of the steel pipe pile to prevent the cylindrical portion from being inserted further into the hole of the steel pipe pile.   In a vehicle construction machine having a lift with a claw, the steel pipe pile press-fitting device can be moved up and down by inserting the claw of the lift into the claw insertion hole of the steel pipe pile press-fitting device according to claim 3. Vehicle construction machine with steel pipe pile press-in device. In the steel pipe pile press-in method for press-fitting a steel pipe pile into the soil under the building using the steel pipe pile press-in device according to claim 6 or 7,
Extending the cylinder of the hydraulic jack, inserting the cylindrical portion of the hat-type stroke adjusting material at the tip of the cylinder into the hole of the steel pipe pile, and fixing the steel pipe pile;
Transporting the steel pipe pile to just below the target building and standing the steel pipe pile at the press-fit position;
Extending the cylinder and press-fitting the steel pipe pile into the soil with the scissors of the hat-type stroke adjusting material;
A method for press-fitting a steel pipe pile, comprising: Subsequent to the step of the method for press-fitting a steel pipe pile according to claim 9, the step of returning the cylinder, placing another steel pipe pile on the press-fitted steel pipe pile, and welding both of them,
The step of extending the cylinder and press-fitting the welded another steel pipe pile into the soil with the scissors of the hat-type stroke adjusting material;
The steel pipe pile press-in method characterized in that the steel pipe pile and the another steel pipe pile are vertically connected and press-fitted into the soil. Following the step of press-fitting the steel pipe pile into the soil with the scissors of the hat-type stroke adjusting material in the steel pipe pile press-in method according to claim 9 or 10,
Returning the cylinder and placing an iron plate on the press-fitted steel pipe pile;
Extending the cylinder, pressing the steel plate downward at the end of the cylindrical portion of the hat-type stroke adjusting material, and further press-fitting the steel pipe pile that has been press-fitted into the soil;
A method for press-fitting a steel pipe pile, comprising:

Images