Pile jacking device and pile jacking method

Abstract

To provide a pile jacking device and a pile jacking method which can be accurately and easily constructed even in a narrow site and a low overhead clearance.SOLUTION: A pile jacking device 1 includes a frame unit 10, two rail units 20, a jacking unit 30, and connecting means 40. The pile jacking device is configured to use loads of the base unit 10 and the rail units 20 by connecting the base unit 10 and the rail units 20, as reaction force of jacking of a pile P by the jacking unit 40. A pile jacking method includes: a moving step S1 of moving the frame unit 10 along the rail units 20; a connecting step S2 of connecting the frame unit 10 and the rail units 20 by the connecting means 40; a jacking step S3 of jacking the pile P into the ground by the jacking unit 30, by using the loads of the base unit 10 and the rail units 20 as the reaction force; and a releasing step S4 of releasing the connection of the frame unit 10 and the rail units 20 by the connecting means 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pile driving device and a pile driving method, and more particularly to a pile driving device and a pile driving method that enable accurate and easy construction even in a narrow site or in an environment with low headroom. [Background technology]

[0002] When constructing buildings or structures on soft ground with insufficient bearing capacity, the steel pipe pile method has traditionally been widely used to ensure the stability of the foundation. This method uses small-diameter steel pipe piles made of structural carbon steel, which are then rotary-driven into the ground by a construction machine, so that the tip of the steel pipe pile reaches the bearing layer deep in the ground, and the tip bearing capacity and surface friction of the steel pipe pile ensure the stability of the foundation. Patent Document 1 discloses a steel pipe pile driving-in device that grips a steel pipe pile with a plurality of support claws and rotates and drives the steel pipe pile in without clamping the pile. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-064282 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional technology has the following problems. <1> Because the equipment is large, it is difficult to work in narrow construction areas such as urban areas or residential areas where the depth or width is insufficient because the working radius is insufficient. <2> Since the piles are erected above the equipment, in low-headroom environments where there are obstacles such as bridges and high-voltage lines above, construction may not be possible due to insufficient height. <3> Even when a large number of piles are pressed into place in a linear arrangement, the device must be rotated and positioned each time it is moved, resulting in poor construction efficiency and low construction accuracy. <4> Because it uses an internal combustion engine for power, exhaust gases containing carbon dioxide (CO2) and nitrogen oxides (NOx) place a burden on the global environment. In addition, the rotation and pressure injection generates vibrations and noise, which is a burden on neighboring residents, especially in residential areas.

[0005] An object of the present invention is to provide a pile driving device and a pile driving method that can solve the above problems. [Means for solving the problem]

[0006] The pile driving device of the present invention comprises two long rail units arranged approximately parallel to one another, a base unit mounted on the rail units so as to be movable along the rail units, a driving unit attached downward to the lower part of the base unit, and a connecting means capable of connecting the base unit and the rail units, and is characterized in that by connecting the base unit and the rail units, the load of the base unit and the rail units can be used as a reaction force when the driving unit drives the piles into place.

[0007] The pile driving device of the present invention has a mounting unit that has a roughly gate-like shape when viewed from the front and includes a reaction force mounting base, a plurality of support legs that support the reaction force mounting base, and movable wheels provided at the bottom of the support legs, and the driving unit may be attached to the bottom surface of the reaction force mounting base.

[0008] In the pile driving device of the present invention, the rail unit may comprise a long base and a rail material installed on the base, and the connecting means may connect the support leg and the base.

[0009] The pile driving device of the present invention may be configured such that the mounting unit includes a connecting member protruding laterally from the support leg, the connecting member having a first connecting hole connecting the connecting member in the vertical direction, the base having a second connecting hole connecting the base in the vertical direction, and the connecting means includes a connecting bar having a threaded groove and a nut that can be screwed onto the connecting bar, and the connecting bar is connected to the first connecting hole and the second connecting hole and the nut is screwed onto the connecting bar to connect the support leg and the base.

[0010] In the pile driving device of the present invention, the connecting members may protrude laterally from both sides of the support leg.

[0011] The pile driving method of the present invention is characterized by comprising a moving step of moving a mounting unit along a rail unit using a pile driving device, a connecting step of connecting the mounting unit and the rail unit with a connecting means, a pressing step of using the loads of the mounting unit and the rail unit as a reaction force to press the pile into the ground with a pressing unit, and a releasing step of releasing the connection between the mounting unit and the rail unit by the connecting means.

[0012] In the pile driving method of the present invention, in the connecting step, horizontal movement of the mount unit may be restricted by sandwiching the mount unit from the front and rear with a plurality of wheel stoppers fixed on the rail unit.

[0013] In the pile driving method of the present invention, in the driving step, the lower end of the upper split pile may be connected to the upper end of the lower split pile driven into the ground, thereby extending the pile length while driving the pile. [Effects of the Invention]

[0014] The pile driving device and pile driving method of the present invention have at least one of the following effects. <1> The piles are pressed into place while moving horizontally on the rail unit, so by arranging the rail unit along the length of the site, construction can be easily carried out even on narrow sites with insufficient depth or width. <2> The piles are pressed downward from the bottom of the mounting unit using the reaction force of the mounting unit and rail unit, so construction can be carried out without any problems even in low-headroom environments where obstacles such as bridges and high-voltage lines are present. <3> By moving the rail unit horizontally along the guide, multiple piles can be pressed into the piles in succession with high precision. <4> It does not emit gases such as carbon dioxide during injection and generates almost no vibration or noise, making it friendly to the global and local environments. [Brief explanation of the drawings]

[0015] [Figure 1] Illustration of pile driving device [Figure 2] Explanatory diagram of the stand unit [Figure 3] Illustrative diagram of connecting material and connecting means [Figure 4] Illustration of pile pressing method [Figure 5A] Illustration of the transfer process [Figure 5B] Explanation of the connection process [Figure 5C] Explanation of the press-fitting process [Figure 5D] Illustration of the release process DETAILED DESCRIPTION OF THE INVENTION

[0016] The pile driving device and pile driving method of the present invention will be described in detail below with reference to the drawings. In this invention, directional terms such as "length," "width," "height," "side," "upper," and "lower" refer to the direction in which the rail units extend, with the length direction being the length direction, and the direction in which the rail units are aligned, with the width direction being the width direction. [Example]

[0017] [Pile press-in device] <1> Overall configuration (Figure 1) The pile driving device 1 of the present invention is a device that drives a pile P into the ground while moving within a construction area. The pile driving device 1 comprises at least a mount unit 10, a rail unit 20, a press-in unit 30, and a connecting means 40. In detail, the mount unit 10 is mounted on two rail units 20 arranged approximately parallel to each other, and the press-in unit 30 is attached to the bottom of the mount unit 10 facing downward. The connecting means 40 connects or disconnects the mount unit 10 and the rail unit 20. When the gantry unit 10 is to be moved, the connection by the connection means 40 is released. When the pile P is pressed into place by the press-in unit 30, the mount unit 10 and the rail unit 20 are connected by the connecting means 40. This allows the load of the mount unit 10 and the rail unit 20 to be used as a reaction force for pressing in the pile P.

[0018] <2> Mounting unit (Figure 2) The gantry unit 10 is a mobile gantry. In this example, the mount unit 10 includes a reaction mount 11, a plurality of support legs 12, a plurality of moving wheels 13, and a plurality of connecting members 14. In detail, for example, both sides of the reaction force base 11 are supported by a total of six support legs 12, three on each side, to construct a tower structure that is roughly gate-shaped when viewed from the front, and the space between the reaction force base 11 and the support legs 12 and between adjacent support legs 12 are reinforced with braces (not shown). Connecting members 14 are attached to the middle parts of the support legs 12. Moving wheels 13 are attached to the lower parts of the support legs 12. Furthermore, to increase the weight of the base unit 10, weight materials 15 such as iron plates or shaped steel may be mounted on the reaction force base 11. The structure of the stand unit 10 is not limited to the above, and for example, the number of support legs 12 may be four or eight or more. The point is that it is sufficient if it can move on the rail unit 20, can be connected to the rail unit 20 by the connecting means 40, and can be used as a reaction force of the pile P by the press-fit unit 30.

[0019] <2.1>Reaction mount The reaction pedestal 11 is the upper structure of the pedestal unit 10 . In this example, the reaction frame 11 is made up of a plurality of beams 11a made of shaped steel and a plurality of girders 11b made of shaped steel arranged in a lattice pattern. Because shaped steel is strong and heavy, it is particularly suitable as a reaction member for press-fitting. In detail, for example, five beams 11a (middle row) are arranged in parallel in the length direction on top of two beams 11b (lower row) arranged in parallel in the width direction, and five beams 11b (upper row) are arranged in parallel in the width direction on top of the five beams 11a, and each component is connected to each other. In this example, the reaction force stand 11 can be assembled on-site from shaped steel, so there is no need to transport a large finished product from a factory to the site, and transportation costs are low.

[0020] <2.2> Support legs The support legs 12 are members that support the reaction base 11 . In this example, the support leg 12 is made up of a plurality of steel beams connected in the height direction, and a height adjusting device 12a such as a support jack is inserted between the upper and lower members. The upper part of the support leg 12 is connected to the lower beam 11 b of the reaction base 11 . A connecting member 14 is attached to the middle portion of the support leg 12 . A moving wheel 13 is attached to the lower part of the support leg 12.

[0021] <2.3> Connecting material (Fig. 3) The connecting member 14 is a member for connecting to the connecting means 40 . In this example, a channel steel material with the flange side facing upward is used as the connecting material 14, and the connecting material 14 is connected to the inside of the upper member of the support leg 12 in the width direction, with both ends of the connecting material 14 protruding from both sides of the support leg 12. First connecting holes 14a that connect the connecting material 14 in the height direction are provided on both ends of the connecting material 14. The inner diameter of the first connecting holes 14a is set to a diameter that allows a connecting bar 41, which will be described later, to be inserted therethrough. The structure of the connecting member 14 is not limited to the above, and for example, it may not be a separate member from the support leg 12 but may be part of the structure of the support leg 12. Also, it may be provided on the reaction force base 11 or the moving wheel 13 instead of on the support leg 12.

[0022] <3> Rail Unit The rail unit 20 is a unit that guides the movement of the stand unit 10. In this example, the rail unit 20 includes a long base 21 and a rail material 22 installed on the base 21. In detail, the rail unit 20 is configured by welding a steel rail having a substantially I-shaped cross section to the upper surface of the base 21 made of structural steel. A second connecting hole 21a that connects the base 21 in the height direction is provided in the flange of the base 21. The inner diameter of the second connecting hole 21a is set to a diameter that allows a connecting bar 41, which will be described later, to be inserted therethrough.

[0023] <4> Press-fit unit The press-in unit 30 is a unit for pressing the pile P into the ground. In this example, the press-fitting unit 30 is made up of a hydraulic jack having a cylinder 31 installed downward from the bottom surface of the beam 11a and a rod 32 that can extend and retract downward from within the cylinder 31. In this example, two press-fit units 30 are attached to each of the bottom surfaces of the two beams 11a, for a total of four press-fit units 30. However, the number and arrangement of the press-fit units 30 are not limited to those described above.

[0024] <5> Connection means (Fig. 3) The connecting means 40 is a means for connecting the mount unit 10 and the rail unit 20 together. In this example, the connecting means 40 is made up of a combination of a long connecting bar 41 having a threaded groove and a nut 42 that can be screwed onto the connecting bar 41. With the position of the first connecting hole 14a of the connecting material 14 corresponding to the position of the second connecting hole 21a of the base 21, the connecting bar 41 can be connected to the first connecting hole 14a and the second connecting hole 21a and nuts 42 can be screwed onto both the upper and lower ends, thereby connecting the support leg 12 and the base 21. The connecting means 40 is not limited to the combination of the connecting bar 41 and the nut 42, but may be, for example, a clamping metal fitting engaged with the support leg 12 and the base 21, a combination of a chain and a lever hoist wound around the support leg 12 and the base 21, or a combination of a wire and a turnbuckle connecting the support leg 12 and the base 21. In short, any means capable of restraining the stand unit 10 and the rail unit 20 in the height direction will suffice.

[0025] <6> Pile pressing method (Figure 4) The pile driving method of the present invention is a method for continuously driving piles P into the ground using a pile driving device 1. The pile driving method includes at least a moving step S1, a connecting step S2, a driving step S3, and a releasing step S4. The following explanation will begin with the state after the releasing step S4 of the pre-construction cycle has been completed.

[0026] <6.1> Transfer step (Figure 5A) The moving step S1 is a step of pulling the gantry unit 10 laterally along the rail unit 20. The moving step S1 is performed, for example, as follows. The tip of the support leg 12 and the base 21 in the direction of travel are connected by a chain, and the chain is wound up with a towing device such as a lever hoist. By winding up the chain, the platform unit 10 is pulled toward the tip of the base 21 with the rail unit 20 acting as a reaction force, and moves horizontally toward the tip along the rail material 22. The same operation is repeated to pull the platform unit 10 sideways until the position of the press-in unit 30 reaches the next press-in position of the pile P. Note that the platform unit 10 can be pulled sideways not only by a lever hoist but also by an electric winch, hydraulic jack, or the like.

[0027] <6.2> Ligation step (Figure 5B) The connecting step S2 is a step of connecting the stand unit 10 and the rail unit 20. The connecting step S2 is performed, for example, as follows. The connecting bar 41, with a nut 42 screwed near its upper end, is dropped into the first connecting hole 14a from above the connecting material 14, and its lower end is inserted into the second connecting hole 21a of the base 21. The nut 42 is screwed onto the lower end of the connecting bar 41 that protrudes downward from the second connecting hole 21a, connecting the support leg 12 and the base 21. The same procedure is repeated for all the support legs 12 to fix the mount unit 10 to the rail unit 20. In addition, in this example, wheel stoppers 23 are installed on the rail members 21 at the front and rear of the mount unit 10 and fixed with bolts, so that the mount unit 10 is sandwiched between the wheel stoppers 23 from the front and rear, thereby strengthening the fixation.

[0028] <6.3> Press-fitting process (Figure 5C) The press-in step S3 is a step of pressing the pile P into the ground using the press-in unit 30. The press-in step S3 is performed, for example, as follows. The reaction base 11 is adjusted to a horizontal position by operating the height adjuster 12a of the support leg 12. The pile P is erected at the driving position on the ground, and the rod 32 of the press-in unit 30 is extended so that the tip of the rod 32 comes into contact with the head of the pile P. The press-in unit 30 is operated to hydraulically push out the rod 32, penetrating the tip of the pile P into the ground. At this time, the reaction force of the press-in pushes the base unit 10 up against the press-in unit 30, but the load of the base unit 10 and the rail unit 20 prevents it from floating up. In this example, the pile P is composed of a combination of split piles whose entire length is divided into multiple parts. In detail, first, the first divided pile P 1 After pressing in to a specified depth, the first divided pile P 1 At the top end of the second split pile P 2 The lower end of each pile is abutted against the other pile, and the connecting portion is welded all around to form the first divided pile P 1 and the second split pile P 2 Connect in the height direction. Subsequently, the second divided pile P is pressed into the press-in unit 30. 2 By bearing the head of the second divided pile P 2 First split pile P through 1 The tip of the pile is pressed into the ground. In this way, a pile P consisting of the entire length of multiple split piles is constructed in the ground.

[0029] <6.4> Release step (Figure 5D) The release step S4 is a step of releasing the connection between the gantry unit 10 and the rail unit 20. The release step S4 is performed, for example, as follows. The nut 42 screwed onto the lower end of the connecting bar 41 is removed, and the connecting bar 41 is pulled upward from the second connecting hole 21 a of the base 21 and the first connecting hole 14 a of the connecting member 14 . The same procedure is repeated for all the support legs 12 to release the fixing of the mount unit 10 and the rail unit 20. Next, the bolts of the wheel stoppers 23 fixed to the rail material 21 are loosened and removed, thereby allowing the gantry unit 10 to move along the rail material 21. [Explanation of symbols]

[0030] 1 Pile press-in device 10 Mounting unit 11 Reaction mount 11a Beam material 11b Girder material 12 Support legs 12a Height adjustment tool 13 Moving Wheel 14 Connecting material 14a 1st connection hole 15 Weight Material 20 Rail Unit 21 Foundation 21a 2nd connection hole 22 Rail material 23 Wheel stopper 30 Press-fit unit 31 cylinders 32 Rod 40 Connection means 41 Connecting bar 42 Nut P pile S1 Moving process S2 connection process S3 Press-fit process S4 release process

Claims

1. A pile driving device for driving a pile into the ground, Two long rail units arranged approximately parallel to each other; a platform unit mounted on the rail unit so as to be movable along the rail unit; a press-fitting unit attached downward to a lower portion of the stand unit; a connecting means for connecting the rack unit and the rail unit, By connecting the mount unit and the rail unit, the load of the mount unit and the rail unit can be used as a reaction force of the pile press-in by the press-in unit. Pile press-in equipment.

2. the mount unit has a generally gate-like shape in front view and includes a reaction force mount, a plurality of support legs that support the reaction force mount, and moving wheels provided at the bottom of the support legs; The press-fit unit is attached to the bottom surface of the reaction force base. The pile driving device according to claim 1.

3. The rail unit includes a long base and a rail member installed on the base, The connecting means connects the support legs and the base. The pile driving device according to claim 2.

4. the pedestal unit includes a connecting member protruding laterally from the support leg, The connecting material has a first connecting hole that communicates with the connecting material in a height direction, the base includes a second connecting hole that communicates with the base in a height direction, the connecting means comprises a connecting bar having a thread groove and a nut that can be screwed onto the connecting bar; The connecting bar is connected to the first connecting hole and the second connecting hole, and a nut is screwed onto the connecting bar to connect the support leg and the base. The pile driving device according to claim 3.

5. The connecting members protrude laterally from both sides of the support legs. The pile driving device according to claim 4.

6. A pile driving method using the pile driving device according to any one of claims 1 to 5, a moving step of moving the mount unit along the rail unit; a connecting step of connecting the rack unit and the rail unit by the connecting means; a press-in process in which the pile is pressed into the ground by the press-in unit using the loads of the mounting unit and the rail unit as a reaction force; a release step of releasing the connection between the rack unit and the rail unit by the connection means, Pile press-in method.

7. In the connecting step, the horizontal movement of the gantry unit is restricted by sandwiching the gantry unit from the front and rear with a plurality of wheel stoppers fixed on the rail unit. The pile driving method according to claim 6.

8. In the press-in process, the lower end of the upper split pile is connected to the upper end of the lower split pile pressed into the ground, thereby extending the pile length while pressing in. The pile driving method according to claim 6.

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