Pile construction method and pile construction apparatus

Abstract

To provide a pile construction method and pile construction apparatus that allows for easy placement of equipment for driving piles even in confined work sites, while also enhancing safety. [Solution] A pile construction method according to one embodiment involves driving piles into the ground to construct them. The pile construction method comprises the steps of: positioning a crane 10 having a plurality of gate-shaped support columns 11 and a lifting member 13 supported by the plurality of gate-shaped support columns 11 above the ground G; suspending a down-the-hole hammer 3 from the lifting member 13; moving the lifting member 13 so that the down-the-hole hammer 3 drills into the ground G to form a pile hole; and installing the pile into the pile hole.

Description

Technical Field

[0001] The present disclosure relates to a pile construction method and a pile construction device.

Background Art

[0002] Patent Document 1 describes a slope stabilization method for stabilizing a slope using micropiles as piles. This stabilization method is applied to an excavated slope surface having a first slope, a first small section, a second slope, a second small section, and a third slope. The construction of the micropiles is performed using a down-the-hole hammer. The down-the-hole hammer operates the hammer part by air pressure to apply an impact load to the eccentric expanding bit, and the ground is drilled by using the down-the-hole hammer and the eccentric expanding bit in combination.

[0003] Patent Document 2 describes a method of driving a tubular pile. In this driving method, a tubular pile is driven in the construction of a trestle at a dam site. A mechanical scaffold having a guide member and a main frame is constructed on an existing tubular pile, and a crane is placed on the mechanical scaffold. The guide member protrudes from the mechanical scaffold in a cantilevered manner, and a pile guide and a gripping device for gripping the tubular pile are provided at the protruding portion. The tubular pile is driven by lowering a digging device suspended by the crane while the gripping device grips the tubular pile guided by the pile guide.

[0004] Patent Document 3 describes a steel pipe pile type earth and sand collapse prevention facility. The steel pipe pile type earth and sand collapse prevention facility has a pipe anchor, which is a steel pipe pile, buried across an unstable layer and a stable layer with a slip surface as a boundary, and an installation hole extending from the pipe anchor to the ground surface. The pipe anchor is driven by a boring machine. The boring machine includes a gantry, a drill bit drive unit, a winch, and a winch for the drive unit. The boring machine is arranged on an inclined surface, and the posture of the boring machine is stabilized by a stay rope.

[0005] Patent Document 4 describes a method for excavating a slope in conjunction with the construction of a continuous underground wall. For slope excavation work, a work platform, a gantry crane, a hoisting machine, and an excavator are positioned on the slope. A pair of rails are laid on the work platform, and the gantry crane is positioned to travel on these rails. The hoisting machine is mounted on the gantry crane, and the excavator is suspended from the lower end of a wire hanging down from the hoisting machine.

[0006] In this excavation method, a trench is formed by excavation as the excavator descends. Excavation of the slope by the excavator is repeated each time the gantry crane travels on the work platform, thereby forming a continuous trench. Then, a stabilizing fluid is filled into the trench, and a watertight wall is constructed by pouring asphalt mastic into the trench filled with the stabilizing fluid. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 3769637 [Patent Document 2] Patent No. 6319935 [Patent Document 3] Patent No. 7233829 [Patent Document 4] Patent No. 6276594 [Overview of the project] [Problems that the invention aims to solve]

[0008] Incidentally, in confined work sites, it can be difficult to place a large crane on top of a mechanical scaffolding. Similarly, in confined work sites, it can be difficult to position the equipment used for driving piles. Furthermore, as mentioned earlier, in excavation methods where a gantry crane is driven on a work platform, there is a possibility of collision with the gantry crane, and there is room for improvement in terms of safety. Therefore, there is a need to be able to easily position the equipment used for driving piles even in confined work sites while also improving safety.

[0009] The purpose of this disclosure is to provide a pile construction method and pile construction apparatus that can easily position equipment for driving piles even in confined sites, and that can enhance safety. [Means for solving the problem]

[0010] (1) The pile construction method relating to this disclosure involves driving piles into the ground to construct them. The pile construction method comprises the steps of: positioning a crane having a plurality of gate-shaped support columns and a lifting member supported by the plurality of gate-shaped support columns above the ground; suspending a down-the-hole hammer from the lifting member; moving the lifting member so that the down-the-hole hammer drills into the ground to form a pile hole; and installing the pile into the pile hole.

[0011] In this pile driving method, a crane with multiple gantry columns and lifting members supported by the gantry columns is positioned above the ground. A down-the-hole hammer is suspended from the lifting members, and the lifting members that suspend the down-the-hole hammer move. The down-the-hole hammer, suspended by the lifting members, drills holes in the ground, forming pile holes, into which the piles are then driven. Unlike the large cranes mentioned earlier, the crane with multiple gantry columns and lifting members can be easily positioned above the ground, making it easier to position the equipment used for driving piles. Furthermore, the lifting members supported by the gantry columns move while suspending the down-the-hole hammer. Therefore, safety can be enhanced compared to the case where a gantry crane is moved.

[0012] (2) In (1) above, the crane may have a horizontal member that connects the multiple gantry columns to each other on the inside and above of the multiple gantry columns. The lifting member may be movable along the horizontal member, and in the process of forming the pile hole, the lifting member may be moved along the horizontal member. In this case, the lifting member moves along the horizontal member located on the inside and above of the multiple gantry columns. By providing the lifting member on the inside and above of the multiple gantry columns, safety can be further enhanced. Furthermore, since the multiple gantry columns do not move, the space between the multiple gantry columns can be used as a space for arranging materials and equipment. Therefore, the arrangement of equipment for driving piles can be made even easier.

[0013] (3) In (1) or (2) above, the pile construction method may include a step of driving a protective pipe into the ground at the location where the pile will be erected before the step of forming the pile hole. In the step of forming the pile hole, the inside of the protective pipe in the ground may be drilled. In this case, even if the ground is soft ground, the problem of the hole wall collapsing can be prevented by driving the protective pipe in first and drilling the inside of the protective pipe in the ground.

[0014] (4) In any of (1) to (3) above, the pile construction method may include a step of placing the down-the-hole hammer on a chill roller and positioning the down-the-hole hammer below the suspension member by the chill roller, before the step of suspending the down-the-hole hammer from the suspension member. In this case, the down-the-hole hammer can be easily moved below the suspension member by the chill roller. Therefore, the arrangement of the equipment for driving piles can be made even easier.

[0015] (5) The pile construction device relating to this disclosure constructs piles by driving them into the ground. The pile construction device comprises a crane having a plurality of gate-shaped support columns and a suspension member movably supported by the plurality of gate-shaped support columns, a down-the-hole hammer that forms a pile hole by drilling into the ground while suspended from the suspension member, and a driving device for driving piles into the pile hole.

[0016] This pile construction device includes a plurality of gantry columns and a crane having a suspension member supported by the plurality of gantry columns, and this crane is arranged above the ground. The suspension member of the crane suspends a down-the-hole hammer and moves in a state where the down-the-hole hammer is suspended. A pile hole is formed by the down-the-hole hammer suspended by the suspension member drilling into the ground, and a pile driving device builds a pile into this pile hole. The plurality of gantry columns and the crane having the suspension member can be easily arranged above the ground, different from the large crane described above, so that the arrangement of the equipment for driving the pile can be easily carried out. Furthermore, by moving the suspension member supported by the plurality of gantry columns in a state where the down-the-hole hammer is suspended, the safety can be enhanced compared with the case of running a gantry crane.

Advantages of the Invention

[0017] According to the present disclosure, it is possible to easily arrange the equipment for driving piles even in a narrow site, and the safety can be enhanced.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is a perspective view showing a site as an example to which the pile construction method and the pile construction device according to the embodiment are applied. [Figure 2] FIG. 2 is a flowchart showing an example of the steps of the pile construction method according to the embodiment. [Figure 3] FIG. 3 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment. [Figure 5] FIG. 5 is a side view schematically showing one step of the pile construction method according to the embodiment. [Figure 6] FIG. 6 is a side view schematically showing one step of the pile construction method according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment. [Figure 8]FIG. 8 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment. [Figure 9] FIG. 9 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment. [Figure 10] FIG. 10 is a cross-sectional view schematically showing one step of the pile construction method according to the embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, embodiments of the pile construction method and the pile construction apparatus according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. The drawings may be drawn with some parts simplified or exaggerated for ease of understanding, and the shapes, dimensional ratios, etc. are not limited to those shown in the drawings.

[0020] FIG. 1 is a perspective view showing a site A as an example to which the pile construction method and the pile construction apparatus 100 according to the present embodiment are applied. The site A is provided on the slope S, and a place E for driving piles C (see FIG. 10) into the slope S is provided. The pile C is a landslide prevention pile constructed on the slope S. The site A is a narrow site for driving a plurality of piles C into the slope S. Therefore, it is difficult to arrange a large crane or the like at the site A. For example, at the site A, a plurality of piles C are driven using only small-sized devices. For example, ground anchors are buried at the site A. Therefore, it is necessary to improve the accuracy of the position of the pile C to be driven in order to avoid the ground anchors.

[0021] At the site A, a gantry 1 composed of a plurality of columns and a plurality of beams is constructed. In plan view, the gantry 1 extends in a first direction D1 and a second direction D2 intersecting the first direction D1. In plan view, the gantry 1 has, for example, a rectangular shape having a long side extending in the first direction D1 and a short side extending in the second direction D2.

[0022] For example, the platform 1 has a top plate 1b on which the pile construction device 100 is placed. The pile construction device 100 installs piles by driving them into the ground G (see Figure 3). The pile construction device 100 includes a down-the-hole hammer 3, a crane 10, and a pile driving device 20 for driving piles. The top plate 1b can be used to place, for example, a small crane 2, a down-the-hole hammer 3, a protective pipe 4, a vibro hammer 5, a chill roller 6, a compressor 7, a vacuum device 21, a table machine 23, and a backhoe 25.

[0023] The small crane 2 is, for example, a 4.9t crane. The down-the-hole hammer 3 forms a pile hole by drilling into the ground. The down-the-hole hammer 3 includes, for example, a hammer 3a and several rods 3b (four in one example). The down-the-hole hammer 3 drills into the ground using a table machine 23.

[0024] The down-the-hole hammer 3 performs drilling by rotating the hammer 3a on the table machine 23. The protective pipe 4 is provided to protect the hole wall. The protective pipe 4 prevents the hole wall of the pile hole from collapsing. For example, multiple protective pipes 4 (6 as an example) are provided on the top plate 1b.

[0025] The vibro-hammer 5 is used to drive the protective pipe 4 into the ground. The chill roller 6 is used to transport materials and equipment under the crane 10. The compressor 7 is installed to supply air to the down-the-hole hammer 3 to excavate the ground.

[0026] The crane 10 has a plurality of gantry columns 11 and a lifting member 13 that is movably supported by the plurality of gantry columns 11. The down-the-hole hammer 3 drills into the ground G while suspended by the lifting member 13. The crane 10 has horizontal members 12 that connect the plurality of gantry columns 11 to each other on the inside and above of the plurality of gantry columns 11, and the lifting member 13 is movable along the horizontal members 12. For example, in the crane 10, the gantry columns 11 and horizontal members 12 are fixed, and only the lifting member 13 moves. The down-the-hole hammer 3 drills into the ground G while suspended by the lifting member 13.

[0027] Multiple gate-shaped support columns 11 are lined up along a first direction D1. A horizontal member 12 is fixed to a beam member 11d located at the upper end of the multiple gate-shaped support columns 11, and the horizontal member 12 extends along the first direction D1. A suspension member 13 is fixed to the horizontal member 12 and moves along the horizontal member 12 in the first direction D1. The location E where the piles are to be driven extends in the first direction D1 at the lower end of the multiple gate-shaped support columns 11. The suspension member 13 suspends the equipment and materials for driving the piles and moves in the first direction D1 above the location E where the piles are to be driven. This allows for accurate, efficient, and safe pile construction at the location E where the piles are to be driven.

[0028] For example, crane 10 is a telpher crane. As an example, crane 10 is a 4.9t telpher crane. In crane 10, the gantry support columns 11 and the cross members 12 do not move, but the lifting members 13 located above and inside the gantry support columns 11 move. Therefore, safety can be enhanced, and equipment such as hoses can be placed at the bottom of multiple gantry support columns 11.

[0029] The driving device 20 is used when driving piles into pile holes. The driving device 20 includes, for example, an injection plant (grout plant) that contains grout to be injected into the pile holes. The driving device 20 includes, for example, several pieces of equipment used when driving piles. The vacuum device 21 is used to suck up the cohesive soil generated during excavation.

[0030] The steps of the pile construction method according to this embodiment will be explained with reference to the flowchart in Figure 2. In this pile construction method, piles are driven into the ground G (see Figure 3) to construct the piles. Figure 2 shows an example of the steps of the pile construction method in which piles are constructed using a pile construction device 100. In this pile construction method, multiple piles (six as an example) are constructed along the first direction D1.

[0031] First, a platform 1 is constructed on the slope S (process of constructing the platform, step S1). As shown in Figures 1 and 3, a platform 1 consisting of multiple columns and multiple beams is constructed on the slope S. Next, a crane 10 is constructed above the site E where the piles in the ground G will be driven (process of constructing the crane, step S2). At this time, the crane 10, which has multiple gate-shaped support columns 11 and lifting members 13 supported by the multiple gate-shaped support columns 11, is positioned above the ground G.

[0032] For example, on the top plate 1b, the diagonal members 11b, 11c, and beam members 11d that constitute the gate-shaped support column 11 are transported by a small crane 2, the diagonal members 11b, 11c and beam members 11d are assembled to create the gate-shaped support column 11, and multiple gate-shaped support columns 11 are lined up along the first direction D1.

[0033] The diagonal members 11b, 11c and beam members 11d may be pre-assembled as a single unit. Then, horizontal members 12 are fixed to the lower part of the beam members 11d of multiple gate-shaped support columns 11 along the first direction D1, and the lifting members 13 are fixed to the horizontal members 12 so as to be movable in the first direction D1. This completes the crane 10. A guide frame member 22 is installed at the pile installation site E. In plan view, the guide frame member 22 is installed in a position surrounding the pile installation site E. Multiple piles are driven inside the guide frame member 22, aligned along the first direction D1. For example, after one pile is completed, the driving of other piles can begin.

[0034] After the crane 10 is completed, the crane 10 is used to drive in the protective pipe 4 (the process of driving in the protective pipe, step S3). At this time, the protective pipe 4 is moved to the planned pile driving position by the lifting member 13 and supported by the guide member 26. Meanwhile, the vibro hammer 5 is transported below the crane 10 by the chill roller 6 and suspended from the lifting member 13 (the process of suspending the vibro hammer from the lifting member). Then, the vibro hammer 5 is moved to the planned pile driving position by the lifting member 13.

[0035] The protective tube 4 is attached to the vibro-hammer 5 (the process of attaching the protective tube to the vibro-hammer). For example, a chucking plate is welded to the upper end of the protective tube 4, and the vibro-chuck of the vibro-hammer 5 grips the chucking plate welded to the protective tube 4, thereby supporting the protective tube 4 with the vibro-hammer 5. Then, the protective tube 4 is driven into the ground G with the vibro-hammer 5. At this time, the vibro-hammer 5 transmits vibrations to the protective tube 4, reducing the frictional force on the surface of the protective tube 4 against the ground G, while inserting the protective tube 4 into the ground G.

[0036] When the vibro-hammer 5 drives the protective pipe 4 into the ground G, a soundproofing sheet 8 may be installed on the gantry support column 11 of the crane 10. In this case, noise leakage caused by driving in the protective pipe 4 can be suppressed, and soundproofing measures can be implemented. For example, the position of the protective pipe 4 can be confirmed by a total station when driving in the protective pipe 4. In this case, the positional accuracy of the protective pipe 4 can be further improved.

[0037] After the protective pipe 4 is driven in, as shown in Figure 4, scaffolding 9 is constructed around the pile installation site E in plan view, and the table machine 23 is installed above the pile installation site E (steps of constructing scaffolding, step of installing table machine). The table machine 23 is installed by suspending the table machine 23 from the suspension member 13 and moving the suspension member 13. The table machine 23 is a rotary table machine of the down-the-hole hammer 3. In plan view, the table machine 23 is in the shape of a rectangular frame with an opening, and the scaffolding 9 is installed around the opening of the table machine 23.

[0038] Next, the down-the-hole hammer 3 is suspended from the lifting member 13 (the process of suspending the down-the-hole hammer, step S4). First, the down-the-hole hammer 3 (hammer 3a and rod 3b, respectively) is transported under the crane 10 by the chill roller 6. That is, the down-the-hole hammer 3 is placed on the chill roller 6, and the chill roller 6 positions the down-the-hole hammer 3 under the lifting member 13 (the process of positioning the down-the-hole hammer under the lifting member).

[0039] As shown in Figure 5, one end of the down-the-hole hammer 3, which is lying down, is hooked to the hook 13b of the suspension member 13 via the wire 24, and a stopper 14 is placed on the other end of the down-the-hole hammer 3. In this state, by moving the suspension member 13 in the first direction D1 (pulling it horizontally), the down-the-hole hammer 3 rises up and extends in the third direction D3. The third direction D3 is a direction that intersects the first direction D1 and the second direction D2, and is, for example, vertically downward.

[0040] The suspension member 13 is movable along the vertical direction. The suspension member 13 lifts the down-the-hole hammer 3 by moving vertically upward with the down-the-hole hammer 3 extending in the third direction D3. Then, the suspension member 13 is moved along the horizontal member 12.

[0041] As shown in Figures 5, 6, and 7, the lifting member 13 is moved in the first direction D1, and the lifting member 13 and the down-the-hole hammer 3 are positioned vertically above the table machine 23. Excavation is performed while lifting the hammer 3a and rod 3b respectively by the lifting member 13 and moving them vertically above the table machine 23. That is, the pile hole H is formed by moving the lifting member 13 and drilling into the ground G with the down-the-hole hammer 3 (the process of forming the pile hole).

[0042] Specifically, the hammer 3a is moved above the protective pipe 4 and placed on the table machine 23. The hammer 3a is rotated and pressed against the ground G below it to drill a hole inside the protective pipe 4 in the ground G. At this time, air is supplied to the hammer 3a from the compressor 7, and the air moves the bit inside the hammer 3a up and down, thereby striking the ground G. Then, the table machine 23 applies rotational force to the hammer 3a. In this way, the ground G is excavated by moving the bit inside the hammer 3a up and down to strike the ground G, and by rotating the hammer 3a with the table machine 23. When excavating the ground G, a soundproofing sheet 8 may be installed on the gantry support column 11 of the crane 10. In this case, the leakage of noise generated by the hammer 3a's excavation can be suppressed, and soundproofing measures can be taken.

[0043] The soil excavated by the hammer 3a rises while circling around the hammer 3a and is discharged to the ground from the upper end of the protective pipe 4. As shown in Figures 7 and 8, the soil discharged to the ground is removed by the backhoe 25 (step S5). The soil discharged to the ground may be placed in sandbags, and the sandbags containing the soil may be removed by the crane 10 (lifting member 13).

[0044] After the hammer 3a moves downward due to excavation of the ground G, a rod 3b is attached to the upper end of the hammer 3a. The rod 3b is lifted by the lifting member 13 and moves vertically upward with the lifting member 13 to connect to the upper end of the hammer 3a.

[0045] After connecting rod 3b to the upper end of hammer 3a, air is supplied to hammer 3a from compressor 7 via rod 3b. As described above, the air moves the bit inside hammer 3a up and down, striking the ground G, while table machine 23 rotates hammer 3a to drill a hole in the ground G. A vacuum device 21 (see Figure 1) sucks up the mud generated during drilling. After rod 3b moves downward due to the hammer 3a's excavation of ground G, another rod 3b is added to the upper end of rod 3b.

[0046] In this manner, the rod 3b is extended and the ground G is drilled repeatedly to form a pile hole H of a predetermined depth. While the pile hole H is being formed, for example, a monitor M is stationed to monitor the excavation of the ground G by the down-the-hole hammer 3. The monitor M monitors for any abnormalities in the slope S and for any water spurting out during drilling. After the pile hole H of the predetermined depth has been formed, the slime in the pile hole H is removed to complete the pile hole H.

[0047] After the pile hole H is completed, the table machine 23 and the down-the-hole hammer 3 are removed from the pile hole H as shown in Figure 9 (the process of removing the down-the-hole hammer). This removal is carried out by the lifting members 13 lifting and moving the rod 3b and hammer 3a of the down-the-hole hammer 3, as well as the table machine 23.

[0048] As shown in Figure 10, after the down-the-hole hammer 3 and table machine 23 are removed, the pile C is installed in the pile hole H (pile installation process, step S6). The pile C is, for example, a steel pipe pile. Similar to the down-the-hole hammer 3, the pile C is suspended by the lifting member 13 and transported vertically upward from the pile hole H. That is, one end of the pile C is hooked onto the hook 13b of the lifting member 13 via the wire 24, and the lifting member 13 is moved in the first direction D1, thereby raising the lifting member 13 and lifting the pile C and transporting it vertically upward from the pile hole H. After the pile C is lowered into the pile hole H, another pile C is added to the upper end of the said pile C.

[0049] For example, the upper and lower ends of pile C are threaded. In this case, the pile C is extended by screwing the threads of the lower end of another pile C into the threads of the upper end of the first pile C. A protective ring may be installed on the threaded portion (threaded part) of the pile C to prevent damage to the pile C when it is lifted by the lifting member 13. For example, the pile C is fixed to a lifting platform placed in the pile hole H, and the pile C is extended by screwing another pile C into the threaded portion of the first pile C. The extension of the pile C and the lowering of the pile C in the pile hole H are repeated until a pile C of a predetermined length is installed in the pile hole H.

[0050] After the pile C has been installed in the pile hole H, the pile C is filled with grout (step S7). For example, a driving device 20 is assembled on the slope S and grout is pumped from the driving device 20 to the outer circumference of the pile C. At this time, grout is filled between the outer circumference of the pile C and the inner wall of the pile hole H. Alternatively, an injection pipe may be attached to the pile C in advance, and the driving device 20 may pump grout through the injection pipe to fill the pile hole H from the bottom. A supervisor M may be stationed during the grout filling process to monitor whether or not the grout is leaking out.

[0051] After the filled grout has hardened, the pouring device 20 pours a filler material into the inside of the pile C. This filler material is, for example, concrete. The pouring device 20 includes, for example, a pump truck and piping (a tremie pipe as an example), and installs this piping inside the pile C. For example, a lifting member 13 lifts the piping and moves it vertically above the pile C, then lowers the piping into the inside of the pile C.

[0052] Then, a concrete pump truck pumps concrete into the piping, thereby pouring concrete into the inside of pile C. While pouring the concrete, the piping is lifted up by the lifting member 13, and after the concrete pouring is complete, the piping is lifted up from pile C by the lifting member 13. Through these steps, the filling of the pile C with the filling material is completed, and pile C is completed.

[0053] As shown in Figure 1, at location E where the piles are to be installed, multiple piles C are constructed aligned along the first direction D1. For example, one of the piles C is completed before the others are constructed. For instance, when constructing multiple piles C such that the first, second, third, fourth, ..., nth pile (where N is an even number greater than or equal to 6) are aligned along the first direction D1 in that order, the first, third, ..., n-1 piles are constructed first in that order, and then the second, fourth, ..., nth piles are constructed. By constructing multiple piles C in this manner, it is possible to construct piles C efficiently and with high precision while avoiding the influence of other already constructed piles C.

[0054] Next, the effects and advantages obtained from the pile construction method and pile construction apparatus 100 according to this embodiment will be described in more detail. In the pile construction method and pile construction apparatus 100 according to this embodiment, a crane 10 having a plurality of gantry columns 11 and a lifting member 13 supported by the plurality of gantry columns 11 is positioned above the ground G. A down-the-hole hammer 3 is suspended from the lifting member 13, and the lifting member 13 that suspends the down-the-hole hammer 3 moves. A pile hole H is formed when the down-the-hole hammer 3 suspended by the lifting member 13 drills into the ground G, and a pile C is erected in the pile hole H. Unlike large cranes, the crane 10 having a plurality of gantry columns 11 and a lifting member 13 can be easily positioned above the ground G, making it easy to position the equipment that drives the pile C. Furthermore, the lifting member 13 supported by the plurality of gantry columns 11 moves while suspending the down-the-hole hammer 3. Therefore, safety can be increased compared to when a gantry crane is moved.

[0055] In this embodiment, the crane 10 has horizontal members 12 that connect the multiple gate-shaped support columns 11 to each other, located inside and above the multiple gate-shaped support columns 11. The lifting member 13 is movable along the horizontal members 12, and in the process of forming the pile hole H, the lifting member 13 is moved along the horizontal members 12. In this case, the lifting member 13 moves along the horizontal members 12 located inside and above the multiple gate-shaped support columns 11. By providing the lifting member 13 inside and above the multiple gate-shaped support columns 11, safety can be further enhanced. Furthermore, since the multiple gate-shaped support columns 11 do not move, the space between the multiple gate-shaped support columns 11 can be used as a space for arranging materials and equipment. Therefore, the arrangement of equipment for driving piles C can be made even easier.

[0056] In this embodiment, the pile construction method includes a step of driving a protective pipe 4 into the ground G at the location E where the pile will be erected, before the step of forming the pile hole H. In the step of forming the pile hole H, the inside of the protective pipe 4 in the ground G is drilled. In this case, even if the ground G is soft ground, the problem of the hole wall collapsing can be prevented by driving the protective pipe 4 in first and drilling the inside of the protective pipe 4 in the ground G.

[0057] In this embodiment, the pile construction method includes a step of placing the down-the-hole hammer 3 on a chill roller 6 and positioning the down-the-hole hammer 3 below the suspension member 13 by the chill roller 6, prior to the step of suspending the down-the-hole hammer 3 from the suspension member 13. In this case, the down-the-hole hammer 3 can be easily moved below the suspension member 13 by the chill roller 6. Therefore, the arrangement of the equipment for driving the pile C can be made even easier.

[0058] In this embodiment, the lifting member 13 of the crane 10 moves the equipment and materials used for forming the pile hole H and constructing the pile C along the first direction D1. Therefore, the formation of the pile hole H and the construction of the pile C can be performed smoothly and with high precision. Thus, even at a site A where earth anchors are embedded in the ground G, the formation of the pile hole H and the construction of the pile C can be performed in a position that reliably avoids the earth anchors.

[0059] Embodiments of the pile construction method and pile construction apparatus according to this disclosure have been described above. However, the present invention is not limited to the embodiments described above. That is, it will be readily apparent to those skilled in the art that the present invention can be modified and altered in various ways within the scope of the gist described in the claims. In other words, the configuration, function, shape, size, number, material and arrangement of each part of the pile construction apparatus, as well as the content and sequence of steps of the pile construction method, can be appropriately changed within the scope of the gist described above.

[0060] For example, in the embodiment described above, a crane 10 was described that had a lifting member 13 that moves in a first direction D1 along a horizontal member 12. However, instead of this crane 10, a crane having lifting members that move in multiple directions may be provided. For example, the crane 10 may have a rail extending in a second direction D2, and the horizontal member 12 may be movable along the rail. Alternatively, the crane 10 may have a plurality of horizontal members 12 aligned along the second direction D2, and a plurality of lifting members 13 that move along each of the plurality of horizontal members 12. In this case, a plurality of piles C aligned along the second direction D2 can be constructed along with a plurality of piles C aligned along the first direction D1.

[0061] In the embodiments described above, a crane 10 was described in which the gate-shaped support columns 11 and horizontal members 12 are fixed, and only the lifting members 13 move. However, a crane in which at least one of the gate-shaped support columns 11 and horizontal members 12 moves together with the lifting members 13 may also be described. The type of crane can be appropriately changed within the scope of the gist described above. Furthermore, in the embodiments described above, an example of applying the pile construction method and pile construction device 100 to a site A where a slope S is formed was described. However, the pile construction method and pile construction device according to this disclosure are not limited to a site A where a slope S is formed, but can be applied to various sites. [Explanation of Symbols]

[0062] 1... Platform, 1b... Top plate, 2... Small crane, 3... Down-the-hole hammer, 3a... Hammer, 3b... Rod, 4... Protective pipe, 5... Vibro-hammer, 6... Chill roller, 7... Compressor, 8... Soundproofing sheet, 9... Scaffolding, 10... Crane, 11... Gantry support, 11b, 11c... Diagonal members, 11d... Beam members, 12... Horizontal members, 13... Lifting members, 13b... Hook, 14... Anti-slip, 20... Driving device, 21... Vacuum device, 22... Guide frame material, 23... Table machine, 24... Wire, 25... Backhoe, 26... Guide material, 100... Pile construction device, A... Site, C... Pile, D1... First direction, D2... Second direction, D3... Third direction, E... Location, G... Ground, H... Pile hole, M... Supervisor, S... Slope.

Claims

1. A pile construction method for constructing the pile by driving it into the ground, A step of arranging a crane having multiple gate-shaped support columns and lifting members supported by multiple gate-shaped support columns above the ground, The process of suspending a down-the-hole hammer from the aforementioned suspension member, The process involves moving the suspension member and forming a pile hole by having the down-the-hole hammer drill through the ground, The process of installing a pile into the aforementioned pile hole, Equipped with, Pile construction method.

2. The crane has horizontal members that connect the multiple gate-shaped support columns to each other on the inside and upper side of the multiple gate-shaped support columns, The suspension member is movable along the horizontal member, In the step of forming the pile hole, the suspension member is moved along the horizontal member. The pile construction method according to claim 1.

3. Prior to the step of forming the pile hole, the process includes driving a protective pipe into the ground at the location where the pile will be erected. In the step of forming the pile hole, the inside of the protective pipe in the ground is drilled. The pile construction method according to claim 1 or claim 2.

4. Prior to the step of suspending the down-the-hole hammer from the suspension member, the process includes a step of placing the down-the-hole hammer on a chill roller and positioning the down-the-hole hammer below the suspension member by the chill roller. The pile construction method according to claim 1 or claim 2.

5. A pile construction device for driving piles into the ground and constructing the said piles, A crane having multiple gantry columns and lifting members movably supported by the multiple gantry columns, A down-the-hole hammer that forms a pile hole by drilling into the ground while suspended from the aforementioned suspension member, A driving device for driving piles into the aforementioned pile holes, Equipped with, Pile construction equipment.

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