Pile driving system

Abstract

To provide a placement system and a placement method of a pile-like body which can place a pile-like body to a ground with good work efficiency while compactly storing a pair of chains forming the pile-like body, even at a job site with strict height restriction.SOLUTION: A storage part 20 for storing a region where chains 2 are not engaged in a state in which a plurality of parts thereof are bent and extend is provided. Sprockets 13 and drums 14 are provided on rotary shafts 12, and tips of string-like bodies 15 wound around the drums 14 are connected to rear ends 2a of the chains 2. When the pair of chains 2 are moved to the tip side in a longitudinal direction, the drums 14 are rotationally driven in a forward direction together with the sprockets 13 and the string-like bodies 15 are unwound, when the chains 2 are moved to the rear side in the longitudinal direction, the drums 14 are rotationally driven in an inverse direction together with the sprocket 13 and the string-like bodies 15 are wound, and thereby the string-like bodies 15 are maintained so as to be tensioned.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system and method for driving a pile-like body, and more specifically, to a system and method for driving a pile-like body that can drive a pile-like body into the ground efficiently while compactly storing a pair of chains that form the pile-like body, even at sites with strict height restrictions. [Background technology]

[0002] A known method for improving soft ground that may be deformed, such as reclaimed land, is the drainage method, in which a drain material is inserted into the ground and the water contained in the ground is drained to the surface through the drain material. In general, in the drainage method, a cylindrical pile is driven into the ground with the drain material inserted inside. After the pile is driven to a specified depth, the pile is removed from the ground to insert the drain material into the ground.

[0003] At sites with strict height restrictions, such as near airports or under high-voltage lines, it is not possible to install a tall tower and drive a long pile-like body at once. Therefore, a conventional method has been proposed in which a pair of chains are meshed with each other to construct a pile-like body integrated with the pair of chains, and the constructed pile-like body is inserted into the ground (see, for example, Patent Document 1). The pair of chains (link member connectors) that construct this pile-like body are structured so that they can only bend to one side. Therefore, special ingenuity is required to store the pair of chains compactly at sites with strict height restrictions.

[0004] In the soil improvement expansion device described in Patent Document 1, the chain is separated into several segments and stored in a storage device. When changing the length of the pile-like body of this soil improvement expansion device, the segments must be repeatedly connected and disconnected. Therefore, the installation work of the pile-like body requires a lot of man-hours and time. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-112903 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a pile driving system and method that can drive a pile into the ground efficiently while compactly storing a pair of chains that form the pile, even at sites with strict height restrictions. [Means for solving the problem]

[0007] In order to achieve the above object, the pile-shaped body driving system of the present invention includes a pair of chains, a tip insertion section to which the longitudinal tips of the pair of chains are connected, a pair of sprockets around which each of the chains is wound, a pair of rotating shafts supporting each of the sprockets, and a drive mechanism for rotationally driving the pair of rotating shafts, the pair of sprockets are rotated in a forward direction by the drive mechanism via the pair of rotating shafts, and the pair of chains move toward the longitudinal tips, so that the pair of chains mesh with each other along the longitudinal direction, and in this meshed region, a pile-shaped body in which the pair of chains are integrated is constructed, and the tip insertion section and the pile-shaped body are inserted into the ground, and the pair of sprockets are rotated in the reverse direction by the drive mechanism via the pair of rotating shafts, and the pair of chains constructing the pile-shaped body move toward the longitudinal rear ends, so that the meshing between the pair of chains is released, a pair of storage sections for storing therein a pair of string-like bodies, a pair of drums supported by the respective rotating shafts, and a pair of string-like bodies wound around the respective drums and having tip ends connected to the rear ends of the respective chains, each of the storage sections being configured to store the non-meshed areas of the chains in a state in which a plurality of points in the non-meshed areas of the chains are bent, and the non-meshed areas of the chains extend and are stored in each of the storage sections; when the pair of chains move toward the tip ends in the longitudinal direction, the pair of drums are rotated in the forward direction in conjunction with the pair of sprockets, thereby unwinding the string-like bodies from the respective drums and maintaining the string-like bodies extending between the drums and the rear ends of the chains in a tensed state; and when the pair of chains move toward the rear ends in the longitudinal direction, the pair of drums are rotated in the reverse direction in conjunction with the pair of sprockets, thereby winding up the string-like bodies by the respective drums and maintaining the string-like bodies extending between the drums and the rear ends of the chains in a tensed state.

[0008] In the method for driving a pile-like body of the present invention, a pair of rotating shafts on which a pair of sprockets around which each of the chains is wound are supported are rotated in a forward direction by a drive mechanism with a state in which a tip insertion portion is connected to the longitudinal ends of a pair of chains, and the pair of chains are moved toward the longitudinal tip ends to interlock the pair of chains with each other along the longitudinal direction, thereby constructing a pile-like body in which the pair of chains are integrated, while the tip insertion portion and the pile-like body are inserted into the ground, and when the pile-like body is to be pulled out of the ground, the pair of sprockets are rotated in the reverse direction by the drive mechanism via the pair of rotating shafts to move the pair of chains constructing the pile-like body toward the longitudinal rear ends, thereby releasing the mutual interlocking of the pair of chains. In this method for driving a pile-like body, the non-interlocking areas of each of the chains are bent at multiple points. a pair of drums supported on the respective rotating shafts, with the tip ends of the pair of string-like bodies wound around each of the drums connected to the rear ends of the respective chains; when the pair of chains are moved toward the tip ends in the longitudinal direction, the pair of drums are rotationally driven in the forward direction in association with the pair of sprockets, thereby unwinding the string-like body from each of the drums and maintaining the string-like body extending between the drums and the rear ends of the chains in a tensed state; and when the pair of chains are moved toward the rear ends in the longitudinal direction, the pair of drums are rotationally driven in the reverse direction in association with the pair of sprockets, thereby winding up the string-like body by each of the drums and maintaining the string-like body extending between the drums and the rear ends of the chains in a tensed state. Effect of the Invention

[0009] According to the present invention, by storing the non-engaged area of ​​the chain in the storage section in a state where multiple places are bent, the pair of chains forming the pile-like body can be stored compactly even at a site with strict height restrictions. Furthermore, a drum is provided on each rotating shaft on which the pair of sprockets are supported, and the tip end of the string-like body wound on the drum is connected to the rear end of the chain. When the pair of chains is moved in the longitudinal direction, the pair of drums are rotated and driven along with the pair of sprockets, so that the length of the string-like body unwound from each drum is adjusted according to the amount of movement of the chain by the sprockets, and the string-like body extending between the drum and the rear end of the chain is maintained in a tensed state. When the chain stored in the storage section moves, the rear end of the chain is pulled by the string-like body, so that the chain is prevented from slackening. Therefore, the length of the pile-like body can be smoothly changed by simply rotating and driving the pair of sprockets and the pair of drums via the pair of rotating shafts by the drive mechanism. Therefore, even at a site with strict height restrictions, the pair of chains forming the pile-like body can be stored compactly and the pile-like body can be driven into the ground with high work efficiency. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an explanatory diagram showing a schematic longitudinal cross-sectional view of the sprocket side of an embodiment of the pile driving system of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram illustrating a schematic vertical cross-sectional view of the drum side of the concrete pouring system of FIG. 1. [Diagram 3] FIG. 2 is an explanatory diagram illustrating the casting system of FIG. 1 in a plan view. [Figure 4] 2 is an explanatory diagram illustrating the sprocket and its surroundings in a vertical cross-sectional view of FIG. 1; [Diagram 5] 5A and 5B are explanatory diagrams illustrating the chains of the concrete pouring system of FIG. 1, where FIG. 5A is a cross-sectional view of an area where the chains are not meshed, and FIG. 5B is a cross-sectional view of an area where a pair of chains are meshed. [Figure 6]3 is an explanatory diagram showing a schematic vertical cross-sectional view of a pile-shaped body being inserted into the ground by moving the chain in the longitudinal direction from the state shown in FIG. 2; FIG. [Figure 7] 2 is an explanatory diagram illustrating, in a vertical cross-sectional view, the state in which a chain is positioned on the first stage guide rail that constitutes the storage section of the concrete pouring system of FIG. 1. FIG. [Figure 8] 2 is an explanatory diagram illustrating, in a vertical cross-sectional view, the state in which a string-like body is wound around a guide sheave that constitutes the storage section of the concrete pouring system of FIG. 1. [Figure 9] 2 is an explanatory diagram illustrating, in a vertical cross-sectional view, the state in which a chain is positioned on the third guide rail that constitutes the storage section of the concrete pouring system of FIG. 1. FIG. [Figure 10] 2 is an explanatory diagram illustrating a tension adjustment mechanism constituting the concrete pouring system of FIG. 1 in a plan view. FIG. [Figure 11] FIG. 10 is an explanatory diagram illustrating a schematic cross-sectional view of another embodiment of the pile driving system of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a pile driving system and a method for driving a pile of the present invention will be described based on the embodiment shown in the drawings.

[0012] The pile driving system and method of the present invention can be used in various construction methods for driving piles into the ground. The embodiment shown in Figures 1 to 10 illustrates a case where the pile driving system 1 is used for a drainage construction method.

[0013] As illustrated in FIGS. 1 to 4, the concrete driving system 1 includes a pair of chains 2, a tip insertion section 8 to which the longitudinal tips of the pair of chains 2 are connected, and a pair of sprockets 13 around which the respective chains 2 are wound. The concrete driving system 1 further includes a pair of rotating shafts 12 supporting the respective sprockets 13, and a drive mechanism 9 for rotating the pair of rotating shafts 12. The concrete driving system 1 further includes a pair of storage sections 20 for storing the non-meshed areas of the respective chains 2, a pair of drums 14 supported by the respective rotating shafts 12, and a pair of string-like bodies 15 wound around the respective drums 14 and having tip portions connected to the rear end portions 2a of the respective chains 2. The concrete driving system 1 of this embodiment further includes a tension adjustment mechanism 30 for maintaining the tension of the string-like body 15 extending between the drum 14 and the rear end portion 2a of the chain 2 within a preset range.

[0014] Each of the pair of chains 2 has a structure in which a plurality of pieces (meshing pieces 4 and non-meshing pieces 5) are connected in series via a connecting pin 6 so as to be rotatable. The pair of sprockets 13 are rotated in the forward direction by a driving mechanism 9 via a pair of rotating shafts 12, and the pair of chains 2 move toward the longitudinal tip side, so that the pair of chains 2 mesh with each other along the longitudinal direction. The pair of sprockets 13 rotate in opposite directions. The forward direction of the sprocket 13 on the right side of the paper shown in FIG. 1 is left-handed (counterclockwise), and the forward direction of the sprocket 13 on the left side of the paper is right-handed (clockwise). In the region where the pair of chains 2 mesh with each other, a rigid pile-like body 2P is formed by the pair of chains 2 being integrated, and the rotation of the pieces 4 and 5 of the pair of chains 2 is restricted. The pile-like body 2P formed by the pair of chains 2 meshing with each other has a structure having a communication hole 3 that communicates with the interior in the longitudinal direction.

[0015] A pair of sprockets 13 are driven to rotate in the opposite direction (opposite the forward direction) via a pair of rotating shafts 12 by a driving mechanism 9, and a pair of chains 2 constructing a pile-like body 2P move toward the longitudinal rear end side, thereby disengaging the pair of chains 2 from each other. The reverse direction of the sprocket 13 on the right side of the page shown in Fig. 1 is right-handed (clockwise), and the reverse direction of the sprocket 13 on the left side of the page is left-handed (counterclockwise). In the non-engaged area of ​​the chain 2, adjacent links 4, 5 can rotate relatively, and the non-engaged area of ​​the chain 2 can be bent only in one direction.

[0016] The drive mechanism 9 rotates and drives a pair of sprockets 13 via a pair of rotating shafts 12, moving the pair of chains 2 in the longitudinal direction, thereby changing the length of the area where the pair of chains 2 mesh with each other (pile-like body 2P), and driving the pile-like body 2P, into which the pair of chains 2 are integrated, into the ground G and pulling it out of the ground G.

[0017] Each chain 2 in this embodiment has the same basic structure, except that the arrangement of the links 4, 5 is shifted in the longitudinal direction. More specifically, as shown in Fig. 4, this chain 2 has a structure in which meshing links 4 having meshing portions and non-meshing links 5 not having meshing portions are alternately connected in the longitudinal direction via connecting pins 6. Meshing portions are formed on both longitudinal end faces of the meshing links 4, and the meshing portions of the meshing links 4 of the pair of chains 2 mesh with each other to integrate the pair of chains 2 and form a pile-like body 2P.

[0018] As illustrated in FIG. 4 and FIG. 5(a), the meshing piece 4 of this embodiment has two side plates 4a arranged facing each other at a distance, and a middle plate 4b connecting the two side plates 4a. The middle plate 4b extends from one end face of the side plate 4a in the longitudinal direction to the other end face in a direction perpendicular to the two side plates 4a. The middle plate 4b and each side plate 4a are joined by a plurality of bolts. Two pin insertion holes are formed in the side plate 4a at an interval in the longitudinal direction. A semicircular recess is formed in one end face in the longitudinal direction of the side plate 4a, and a semicircular protrusion of the same dimensions as the recess is formed in the other end face in the longitudinal direction. The semicircular recess and protrusion are the concave meshing portion and the convex meshing portion, respectively.

[0019] The non-meshing piece 5 has two side plates 5a arranged facing each other at a distance, and a middle plate 5b connecting the two side plates 5a. The middle plate 5b extends from one end face of the side plates 5a in the longitudinal direction to the other end face perpendicular to the two side plates 5a. The middle plate 5b and each side plate 5a are joined by a plurality of bolts. Two pin insertion holes are formed in the side plate 5a at an interval in the longitudinal direction.

[0020] With the non-meshing link 5 disposed between the two side plates 4a of the meshing link 4, the meshing link 4 and the non-meshing link 5 are connected by a connecting pin 6 that passes through a pin insertion hole of the meshing link 4 and a pin insertion hole of the non-meshing link 5. A cylindrical collar 7 is fitted around each connecting pin 6 so as to be movable. The collar 7 is provided between the two side plates 5a of the non-meshing link 5. Each collar 7 of the chain 2 is configured to fit between the teeth of the sprocket 13.

[0021] As shown in Fig. 4 and Fig. 5(b), when a pair of chains 2 are engaged with each other, the meshing pieces 4 of one chain 2 and the non-meshing pieces 5 of the other chain 2 face each other, and the non-meshing pieces 5 of the other chain 2 are disposed between the two side plates 4a of the meshing pieces 4 of the one chain 2. The concave meshing portion of the meshing piece 4 of one chain 2 and the convex meshing portion of the meshing piece 4 of the other chain 2 are fitted together, and the longitudinal end faces of the side plates 4a of the meshing pieces 4 of one chain 2 and the longitudinal end faces of the side plates 4a of the meshing pieces 4 of the other chain 2 are in contact with each other. Furthermore, the longitudinal end faces of the middle plates 4b of the meshing pieces 4 constituting the same chain 2 are in contact with each other. In the pile-shaped body 2P constructed by meshing the meshing pieces 4 of each chain 2 with each other, a communication hole 3 is formed by the side plate 4a and the middle plate 4b of the meshing piece 4 and the side plate 5a and the middle plate 5b of the non-meshing piece 5.

[0022] As shown in Fig. 4, the tip insertion part 8 in this embodiment is formed in a triangular prism shape, and a through hole that passes through in the longitudinal direction is formed inside. In this embodiment, the tip insertion part 8 having a structure suitable for the drainage method is illustrated, but the shape and structure of the tip insertion part 8 can be changed depending on the application of the concrete pouring system 1. The materials from which the pieces 4, 5, connecting pin 6, collar 7 and tip insertion part 8 are made are not particularly limited, but they are made of metal such as steel, for example.

[0023] As shown in Fig. 3, the drive mechanism 9 is made up of a motor 10 and a reducer 11 connected to the motor 10. A pair of rotating shafts 12 are connected to the reducer 11, and the motor 10 and the reducer 11 rotate the respective rotating shafts 12 in opposite directions at the same speed. A sprocket 13 and a drum 14 are supported on each rotating shaft 12. The sprocket 13 and the drum 14 are disposed at an interval in the longitudinal direction of the rotating shaft 12. The sprocket 13 and the drum 14 supported by the same rotating shaft 12 rotate in the same direction at the same speed.

[0024] A string-like body 15 is wound around the drum 14. The string-like body 15 is, for example, a wire rope or a resin rope. The tip of the string-like body 15 is connected to the rear end 2a of the chain 2 stored in the storage section 20. The tip of the string-like body 15 is connected to the center of the width of the rear end 2a of the chain 2. The string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is in a tensed state (tensioned state). The diameter of the sprocket 13 and the diameter of the winding core part of the drum 14 around which the string-like body 15 is wound are set to be approximately the same dimension so that the longitudinal movement distance of the chain 2 due to the rotational drive of the sprocket 13 and the movement distance of the string-like body 15 due to the rotational drive of the drum 14 when the rotating shaft 12 is rotated are approximately the same.

[0025] When the pair of chains 2 move toward the longitudinal tip end side, the pair of drums 14 rotate in the forward direction along with the pair of sprockets 13, so that the string-like body 15 is unwound from each drum 14, and the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 (the string-like body 15 unwound from the drum 14) is kept in a taut state. When the pair of chains 2 move toward the longitudinal rear end side, the pair of drums 14 rotate in the reverse direction along with the pair of sprockets 13, so that the string-like body 15 is wound up by each drum 14, and the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is kept in a taut state.

[0026] In this embodiment, a support 16 is installed on the ground G. A pair of shaft support parts 17 that support the respective rotating shafts 12 are erected on the support 16 with a gap between them. The motor 10 and the reducer 11 are installed on the support 16. A sprocket 13 is disposed on the upper part of each shaft support part 17. A guide part that guides the pile-like body 2P constructed by the pair of chains 2 in a predetermined driving direction is provided on the lower part of the shaft support part 17. The guide part can be composed of, for example, a roller that rotates while in contact with the pile-like body 2P or a plate-like member that slides against the pile-like body 2P. In this embodiment, a plurality of guide parts composed of rollers are arranged with a gap between them in the driving direction (longitudinal direction) of the pile-like body 2P.

[0027] A storage section 20 is provided on the side of each sprocket 13. Although only the storage section 20 on one side is shown in Figures 1 and 2, storage sections 20 of the same configuration are provided on the side of each of the sprockets 13 on both sides. Each storage section 20 is configured to store the non-meshing area of ​​the chain 2 in an extended state with multiple points of the non-meshing area of ​​the chain 2 bent.

[0028] 2, each storage section 20 has a structure in which a plurality of guide rails 21 (21a-21d) that guide the non-meshing region of the chain 2 are arranged at a distance from each other in the vertical direction. When the tip insertion section 8 is not inserted into the ground G, the non-meshing region of the chain 2 is bent at multiple points and extends along each of the guide rails 21.

[0029] The storage section 20 of this embodiment is configured to include four guide rails 21 (21a to 21d) extending horizontally, three guide rails 21 (21e to 21g) extending vertically, a plurality of support frames 25 extending vertically to support the guide rails 21, and a connecting frame 26 extending horizontally. The four guide rails 21 (21a to 21d) extending horizontally are disposed spaced apart from one another in the vertical direction.

[0030] In the following, the first stage guide rail 21 arranged at the top is referred to as the first guide rail 21a, the second stage guide rail 21 arranged below the first guide rail 21a is referred to as the second guide rail 21b. The third stage guide rail 21 arranged below the second guide rail 21b is referred to as the third guide rail 21c, and the fourth stage guide rail 21 arranged at the bottom is referred to as the fourth guide rail 21d. The three guide rails 21 extending in the vertical direction are referred to as the fifth to seventh guide rails 21e to 21g, respectively. In the following, the sprocket 13 side of each storage section 20 (the right side of the paper in FIG. 1 and the left side of the paper in FIG. 2) is referred to as one side, and the opposite side (the left side of the paper in FIG. 1 and the right side of the paper in FIG. 2) is referred to as the other side.

[0031] A plurality of support frames 25 are erected horizontally at intervals on ground G, and first to fourth guide rails 21a to 21d are supported by the plurality of support frames 25. The upper end of first guide rail 21a is located at the same height as the upper end of sprocket 13.

[0032] A fifth guide rail 21e is disposed on the other side of the second guide rail 21b. The upper part of the fifth guide rail 21e is connected to the end of the other side of the second guide rail 21b. The upper end of the fifth guide rail 21e is located at the same height as the upper end of the second guide rail 21b. The lower end of the fifth guide rail 21e and the upper end of the third guide rail 21c are spaced apart. The other side of the fifth guide rail 21e is formed in an arc shape (semicircular shape), and the upper end of the other side of the third guide rail 21c is also formed in an arc shape. The chain 2 is fitted between the lower end of the fifth guide rail 21e formed in an arc shape and the upper end of the third guide rail 21c.

[0033] A sixth guide rail 21f is disposed on one side of the second guide rail 21b and the third guide rail 21c. The upper part of the sixth guide rail 21f is connected to the end of one side of the second guide rail 21b, and the lower part of the sixth guide rail 21f is connected to the end of one side of the third guide rail 21c. The upper end of the sixth guide rail 21f is located at the same height as the upper end of the second guide rail 21b. The lower end of the sixth guide rail 21f and the upper end of the fourth guide rail 21d are spaced apart. The upper and lower parts of one side of the sixth guide rail 21f are each formed in an arc shape, and the upper end of one side of the fourth guide rail 21d is also formed in an arc shape. The chain 2 is fitted between the lower end of the sixth guide rail 21f formed in an arc shape and the upper end of one side of the fourth guide rail 21d.

[0034] A seventh guide rail 21g is disposed on the other side of the first guide rail 21a and the third guide rail 21c. The seventh guide rail 21g is disposed on the other side of the fifth guide rail 21e. The upper part of the seventh guide rail 21g is connected to the end of the other side of the first guide rail 21a, and the lower part of the seventh guide rail 21g is connected to the end of the other side of the third guide rail 21c. The upper end of the seventh guide rail 21g is located at the same height as the upper end of the first guide rail 21a. The lower end of the seventh guide rail 21g and the upper end of the other side of the fourth guide rail 21d are spaced apart. The upper end and lower end of the other side of the seventh guide rail 21g are each formed in an arc shape, and the upper end of the other side of the fourth guide rail 21d is also formed in an arc shape. The chain 2 is fitted between the lower end of the seventh guide rail 21g, which is formed in an arc shape, and the upper end of the other side of the fourth guide rail 21d.

[0035] A connecting frame 26 is disposed between the second guide rail 21b and the third guide rail 21c. One end of the connecting frame 26 is connected to the sixth guide rail 21f, and the other end of the connecting frame 26 is connected to the fifth guide rail 21e. A tension adjustment mechanism 30 is disposed on one side of the connecting frame 26.

[0036] The non-engaged region of the chain 2 extends from the rear end 2a side to the tip end side (tip insertion part 8 side) along the third guide rail 21c, the fifth guide rail 21e, the second guide rail 21b, the sixth guide rail 21f, the fourth guide rail 21d, the seventh guide rail 21g, and the first guide rail 21a in this order along the respective guide rails 21a to 21g. The non-engaged region of the chain 2 is bent at the other side of the fifth guide rail 21e, the upper and lower parts of the sixth guide rail 21f, and the lower and upper parts of the seventh guide rail 21g. When the tip insertion part 8 is not inserted into the ground G, the rear end 2a of the chain 2 is positioned on the other side of the tension adjustment mechanism 30. When the tip insertion portion 8 is not inserted into the ground G, the non-meshing areas of the chain 2 are stored and extend in a spiral shape when viewed from the front along the first to seventh guide rails 21a to 21g.

[0037] Guide sheaves 24 for guiding the cord-like body 15 are provided on the other side of the fifth guide rail 21e, the upper and lower parts of the sixth guide rail 21f, and the upper and lower parts of the seventh guide rail 21g, where the non-meshed region of the chain 2 is bent. As illustrated in Fig. 6, when the chain 2 moves toward the tip side in the longitudinal direction and the rear end 2a of the chain 2 passes through the guide sheave 24, the cord-like body 15 is wound around the guide sheave 24.

[0038] The path along which the chain 2 moves in the storage section 20 and the path along which the string-like body 15 moves are set to be the same path. When the chain 2 moves toward the longitudinal tip side and the rear end 2a of the chain 2 moves in the order of the third guide rail 21c, the fifth guide rail 21e, the second guide rail 21b, the sixth guide rail 21f, the fourth guide rail 21d, the seventh guide rail 21g, and the first guide rail 21a, the string-like body 15 also extends along the respective guide rails 21a to 21g in the order of the third guide rail 21c, the fifth guide rail 21e, the second guide rail 21b, the sixth guide rail 21f, the fourth guide rail 21d, the seventh guide rail 21g, and the first guide rail 21a.

[0039] 7, each guide rail 21 is configured to have a pair of rail plate portions 22 spaced apart in the width direction of the chain 2. The pair of rail plate portions 22 are disposed between a pair of side plates 5a constituting the non-meshing link 5. In the first guide rail 21a, the second guide rail 21b, the fifth guide rail 21e, the sixth guide rail 21f, and the seventh guide rail 21g, the chain 2 moves in the longitudinal direction along the guide rail 21 with the collar 7 constituting the chain 2 abutting against the ends of the pair of rail plate portions 22.

[0040] The guide sheave 24 is disposed between the pair of rail plate portions 22. The rotating shaft of the guide sheave 24 is supported by the pair of rail plate portions 22. The guide sheave 24 has a groove portion and a pair of flanges provided on both sides thereof. The guide sheave 24 is disposed so that the outer peripheral ends of the pair of flanges are in the same position as the ends of the guide rail 21 with which the chain 2 contacts, as viewed from the front. As illustrated in FIG. 8, when the chain 2 moves toward the tip side in the longitudinal direction and the rear end portion 2a of the chain 2 passes through the guide sheave 24, the cord-like body 15 is wound around the guide sheave 24. When the cord-like body 15 is wound around the guide sheave 24, the cord-like body 15 fits into the groove portion of the guide sheave 24, so that the portion of the cord-like body 15 wound around the guide sheave 24 does not protrude outside the guide sheave 24. Since the string-like body 15 is positioned between the pair of rail plate portions 22, the guide rail 21 and the string-like body 15 do not interfere with each other.

[0041] 9, in the third guide rail 21c and the fourth guide rail 21d, the chain 2 moves in the longitudinal direction on the guide rail 21 with the middle plate 5b of the non-meshing link 5 constituting the chain 2 abutting against the ends of the pair of rail plate portions 22. In this embodiment, a low-friction material 23 that reduces friction between the rail plate portion 22 and the chain 2 (middle plate 5b) is provided at the portion of the pair of rail plate portions 22 that contacts the middle plate 5b of the non-meshing link 5.

[0042] The materials forming the guide rail 21, guide sheave 24, support frame 25, and connecting frame 26 are not particularly limited, and may be, for example, metals such as steel and aluminum alloy. The low-friction material 23 may be, for example, fluororesin or copper alloy, which have low friction resistance. The low-friction material 23 may be provided in any manner. For example, instead of the low-friction material 23, a configuration in which a roller is provided on the guide rail 21, or a configuration in which a lubricant such as grease is applied to the guide rail 21 may be used.

[0043] As illustrated in FIG. 10, the tension adjustment mechanism 30 includes a first sheave 31, a fixing device 32, a second sheave 33, a connecting device 34, a slide portion 35, and a cylinder 36. The cylinder 36 is, for example, an air cylinder or a hydraulic cylinder. The fixing device 32 is fixed to the connecting frame 26, and the first sheave 31 is rotatably supported by the fixing device 32. The connecting frame 26 is provided with a slide portion 35, and the connecting device 34 is connected to the slide portion 35 so as to be slidable in the longitudinal direction of the connecting frame 26. The second sheave 33 is rotatably supported by the connecting device 34. The connecting frame 26 is provided with a cylinder 36, and the connecting device 34 is fixed to the tip of the rod of the cylinder 36. The string-like body 15 unwound from the drum 14 is wound around the first sheave 31 and the second sheave 33 in this order, and the tip of the string-like body 15 unwound from the second sheave 33 is connected to the rear end 2a of the chain 2.

[0044] The rod of the cylinder 36 moves back and forth depending on the magnitude of the stress acting on the second sheave 33 due to the tension of the string-like body 15. When the rod of the cylinder 36 moves back and forth, the connector 34 and the second sheave 33 slide in the longitudinal direction of the connecting frame 26 along the slide portion 35. When the magnitude of the stress acting on the second sheave 33 due to the tension of the string-like body 15 is a preset reference value, the rod of the cylinder 36 does not move back and forth, and the second sheave 33 remains stationary at the reference position.

[0045] When the magnitude of the stress acting on the second sheave 33 due to the tension of the cord-like body 15 becomes larger than a reference value, the rod of the cylinder 36 moves backward, and the second sheave 33 moves in a direction to reduce the tension of the cord-like body 15. Conversely, when the magnitude of the stress acting on the second sheave 33 due to the tension of the cord-like body 15 becomes smaller than a preset reference value, the rod of the cylinder 36 moves forward, and the second sheave 33 moves in a direction to increase the tension of the cord-like body 15. As described above, in this tension adjustment mechanism 30, the second sheave 33 slides in response to the magnitude of the tension applied to the second sheave 33 by the cord-like body 15, so that the tension of the cord-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained within a preset range.

[0046] More specifically, the dimensions of the sprocket 13 and drum 14 and the structure of the storage section 20 are designed to minimize the difference between the longitudinal movement distance of the chain 2 caused by the rotational driving of the sprocket 13 and the movement distance of the cord-like body 15 caused by the rotational driving of the drum 14, but it is difficult to perfectly match the movement distance of the chain 2 with the movement distance of the cord-like body 15. The shorter the movement distance of the cord-like body 15 relative to the movement distance of the chain 2, the greater the tension of the cord-like body 15, and vice versa.

[0047] Therefore, in this embodiment, a tension adjustment mechanism 30 is provided, and the second sheave 33 slides and moves depending on the magnitude of the stress applied to the second sheave 33 by the tension of the cord-like body 15, absorbing the difference in the induction length (movement distance) between the chain 2 and the cord-like body 15. As a result, the tension of the cord-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained within a predetermined range, the cord-like body 15 unwound from the drum 14 is maintained in a taut state, and the application of excessive tension to the cord-like body 15 is suppressed.

[0048] In this embodiment, a drain supply mechanism 40 is further provided to supply the drain material D. The drain supply mechanism 40 is composed of, for example, a drum on which the drain material D is wound, and a sheave that guides the drain material D to the communication hole 3 of the pile-like body 2P. An anchor A is attached to the tip of the drain material D to fix the drain material D at a predetermined position in the ground.

[0049] Next, a description will be given of a method for driving a pile-like body using this driving system 1. In this embodiment, a case will be illustrated in which a pile-like body 2P is driven in the vertical direction and a strip-shaped drain material D is inserted into the ground G.

[0050] As shown in Fig. 2, with the tip insertion part 8 positioned above the ground, drainage material D is inserted through the through hole of the tip insertion part 8, and the tip of the drainage material D is connected to the anchor A positioned below the tip insertion part 8. The tip side of each chain 2 is hung on the corresponding sprocket 13, and the rear end part 2a side of the chain 2 is stored in the corresponding storage part 20. The non-meshing areas of the chain 2 are extended along the respective guide rails 21 (21a to 21g).

[0051] Next, the tip side of the string-like body 15 wound around the drum 14 is looped around the first sheave 31 and the second sheave 33 of the tension adjustment mechanism 30, and the tip of the string-like body 15 is connected to the rear end 2a of the chain 2. The string-like body 15 unwound from the drum 14 is made in a taut state. When the string-like body 15 unwound from the drum 14 is made in a taut state, the rear end 2a of the chain 2 is pulled by the string-like body 15, so that no slack is generated in the non-meshed area of ​​the chain 2. The non-meshed area of ​​the chain 2 is stored in a spiral shape extending along the first to seventh guide rails 21a to 21g in a front view. This completes the setting before the concrete pouring operation.

[0052] During the driving operation, the pair of rotating shafts 12 are driven to rotate in the forward direction by the driving mechanism 9 (motor 10 and reducer 11), thereby driving the pair of sprockets 13 and the pair of drums 14 to rotate in the forward direction. When the pair of sprockets 13 are driven to rotate in the forward direction, the collars 7 of each chain 2 move while being fitted between the teeth of the rotating sprocket 13, and the pair of chains 2 move in the longitudinal direction. The pair of chains 2 that pass between the pair of sprockets 13 from above to below mesh with each other to form a pile-like body 2P. The pile-like body 2P moves toward the ground G while extending. Then, the pile-like body 2P is inserted into the ground G from the tip insertion part 8 by its own weight and the pressure of the driving mechanism 9, and the pile-like body 2P is driven into the ground G. In this embodiment, the anchor A and the drain material D are also inserted into the ground G along with the pile-like body 2P. Then, the pair of sprockets 13 are driven to rotate in the forward direction until the anchor A reaches the desired depth.

[0053] At this time, the non-meshed areas of each chain 2 move toward the longitudinal tip along each guide rail 21 (21a to 21g) constituting the storage section 20. When the pair of chains 2 are moved toward the longitudinal tip, the pair of drums 14 are rotated forward along with the pair of sprockets 13, so that the string-like body 15 is paid out from each drum 14 and the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained in a tensed state.

[0054] At this time, the second sheave 33 of the tension adjustment mechanism 30 slides in response to the magnitude of stress applied to it by the tension of the cord-like body 15, absorbing the difference in induced length (movement distance) between the chain 2 and the cord-like body 15, and the tension of the cord-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained within a preset range. As illustrated in Fig. 6, when the chain 2 moves toward the tip side in the longitudinal direction and the rear end 2a of the chain 2 passes through the guide sheave 24, the cord-like body 15 is wound around the guide sheave 24.

[0055] When the pile-like body 2P is pulled out from the ground G, the pair of rotating shafts 12 are rotated and driven in the opposite directions by the drive mechanism 9, thereby rotating and driving the pair of sprockets 13 and the pair of drums 14 in the opposite directions. When the pair of sprockets 13 are rotated and driven in the opposite directions, the pair of chains 2 move toward the rear end in the longitudinal direction, and the pile-like body 2P that was driven into the ground G moves upward and is pulled out from the ground G. At this time, the anchor A inserted into the ground G together with the pile-like body 2P remains in the ground, and the drain material D is inserted in the ground G. When the pair of chains 2 that constructed the pile-like body 2P pass between the pair of sprockets 13 from below to above, they are released from mutual meshing and separated.

[0056] At this time, the non-meshed areas of each chain 2 move toward the longitudinal rear end along each guide rail 21 (21a to 21g) constituting the storage section 20. When the pair of chains 2 are moved toward the longitudinal rear end, the pair of drums 14 are rotated in opposite directions along with the pair of sprockets 13, so that the string-like body 15 is wound up by each drum 14 and the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained in a taut state.

[0057] At this time, the second sheave 33 of the tension adjustment mechanism 30 slides depending on the magnitude of stress applied to it by the tension of the string-like body 15, absorbing the difference in induced length (movement distance) between the chain 2 and the string-like body 15, and the tension of the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained within a predetermined range.

[0058] Since the concrete pouring system 1 can be moved, when inserting the drain material D in multiple locations, the installation position of the concrete pouring system 1 is changed and the construction is performed using the same procedure.

[0059] In this way, in the present invention, the non-meshed areas of the chain 2 are stored in the storage section 20 in a state where multiple locations are bent, so that the pair of chains 2 forming the pile-like body 2P can be stored compactly even in sites with strict height restrictions such as near airports or under high-voltage lines. Furthermore, a drum 14 is provided on each rotating shaft 12 on which a pair of sprockets 13 are supported, and the tip of the string-like body 15 wound around the drum 14 is connected to the rear end 2a of the chain 2. When the pair of chains 2 are moved in the longitudinal direction, the pair of drums 14 are rotated and driven together with the pair of sprockets 13, so that the length of the string-like body 15 that is paid out from each drum 14 is mechanically adjusted in accordance with the amount of movement of the chain 2 by the sprockets 13, and the string-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 is maintained in a tensed state.

[0060] When the chain 2 stored in the storage section 20 moves, the rear end 2a of the chain 2 is pulled by the string-like body 15 in a taut state, so that the chain 2 is prevented from loosening when the chain 2 moves to the front end side in the longitudinal direction and when the chain 2 moves to the rear end side in the longitudinal direction. This makes it possible to smoothly move the non-engaged areas of the chain 2 along the respective guide rails 21a to 21g. By preventing the non-engaged areas of the chain 2 from loosening, the risk of a malfunction in which the meshing position between the sprocket 13 and the chain 2 is shifted, or a malfunction in which the matching positions of the pair of chains 2 are shifted, can be reduced. The risk of the non-engaged areas of the chain 2 getting caught in the middle of the guide rails 21a to 21g and loosening can also be reduced. Even when the rotation of the rotating shaft 12 is suddenly stopped, the chain 2 can be more reliably prevented from loosening.

[0061] In this way, in the concrete driving system 1, the pair of sprockets 13 and the pair of drums 14 are driven to rotate by the drive mechanism 9 via the pair of rotating shafts 12, and the movement distance of the chain 2 in the longitudinal direction due to the rotational drive of the sprockets 13 and the movement distance of the string-like body 15 due to the rotational drive of the drums 14 can be roughly matched, and the length of the pile-like body 2P can be smoothly changed. For example, when the pair of sprockets 13 and the pair of drums 14 are driven to rotate by separate drive mechanisms, it is necessary to control the output of each drive mechanism so that the rotational speed of the pair of sprockets 13 and the rotational speed of the pair of drums 14 match, but the above-mentioned control is not required in the concrete driving system 1. Therefore, even in a site with strict height restrictions such as near an airport or under a high-voltage line, the concrete driving system 1 can drive the pile-like body 2P into the ground G with work efficiency while compactly storing the pair of chains 2 that form the pile-like body 2P.

[0062] As in this embodiment, by providing a tension adjustment mechanism 30 that maintains the tension of the cord-like body 15 extending between the drum 14 and the rear end 2a of the chain 2 within a preset range, it is possible to more reliably prevent the cord-like body 15 from being subjected to excessive tension while maintaining the cord-like body 15 in a taut state. This is therefore more advantageous in reducing the risk of the cord-like body 15 breaking and the chain 2 becoming loose during the driving operation of the pile-like body 2P.

[0063] Providing a guide sheave 24 for guiding the string-like body 15 in the storage section 20 makes the movement path of the string-like body 15 in the storage section 20 more stable, which is more advantageous for moving the string-like body 15 in a stable state. By looping the string-like body 15 around the guide sheave 24 and creating a structure that does not interfere with the guide rail 21, it is possible to prevent the string-like body 15 from coming into contact with the guide rail 21 and becoming worn, or the string-like body 15 from getting caught on the corners of the guide rail 21 and becoming damaged.

[0064] If the guide rail 21 has a pair of rail plate portions 22 arranged between a pair of side plates 5a constituting the non-meshing pieces 5, the chain 2 can be moved along the guide rail 21 in a very stable state, despite the simple configuration. If the collar 7 constituting the chain 2 abuts against the end of the guide rail 21 (rail plate portion 22), the collar 7 rotates relative to the connecting pin 6 when the chain 2 moves in the longitudinal direction on the guide rail 21, making it difficult for large friction to occur between the guide rail 21 and the chain 2. This is therefore advantageous for smoothly moving the chain 2 along the guide rail 21, and is also advantageous for suppressing wear and damage to the guide rail 21 and the chain 2.

[0065] In the guide rail 21 against which the middle plate 5b of the non-meshing link 5 constituting the chain 2 abuts, providing a low-friction material 23 on the portion of the guide rail 21 (rail plate portion 22) that contacts the chain 2 can further reduce friction between the guide rail 21 and the chain 2, which is advantageous for smooth movement of the chain 2 along the guide rail 21. This is also advantageous for suppressing wear and damage to the guide rail 21 and the chain 2. The same effect can be achieved when a low-friction material 23 is provided on the guide rail 21 that abuts against the collar 7.

[0066] FIG. 11 illustrates a concrete pouring system 1 according to another embodiment of the present invention.

[0067] As illustrated in Fig. 11, in this embodiment, the concrete driving system 1 is mounted on a barge 50, and a pile-like body 2P is driven into the ground G at the bottom of the water. The barge 50 is provided with a through hole 51 extending in the vertical direction, and the pile-like body 2P constructed of a pair of chains 2 interlocking with each other is inserted into the through hole 51. The other configurations are the same as those of the concrete driving system 1 of the embodiment illustrated in Figs. 1 to 10.

[0068] As in this embodiment, even when the driving system 1 is mounted on a ship such as a barge 50 that oscillates on the water or on an above-water structure, the length of the pile-like body 2P can be changed simply by rotating the pair of sprockets 13 and the pair of drums 14 via the pair of rotating shafts 12 by the drive mechanism 9, so that the pile-like body 2P can be driven stably and efficiently into the ground G at the bottom of the water. Furthermore, since the pair of chains 2 can be stored compactly in the storage section 20 and the center of gravity can be lowered, the driving system 1 can be mounted on a ship such as a barge 50 or on an above-water structure in a very stable state. Therefore, the driving system 1 is also very useful in the construction of driving the pile-like body 2P into the ground G at the bottom of the water.

[0069] Although the above example shows a case where the pile-like body 2P is driven in the vertical direction, the driving system 1 can drive the pile-like body 2P in an oblique direction or horizontal direction by changing the installation direction. In addition, the driving system 1 can be used for various construction methods other than the drainage method and ground improvement method by providing another mechanism such as an excavation mechanism (for example, a drill) at the tip insertion part 8.

[0070] The shape and structure of the links 4 and 5 constituting the pair of chains 2 are not limited to the embodiment exemplified above, and may be other configurations. In addition, the storage section 20 is not limited to this embodiment, and may be various other configurations, as long as the non-engaged area of ​​the chain 2 is stored in an extended state with multiple points of the non-engaged area of ​​the chain 2 bent. For example, the number and structure of the guide rails 21 constituting the storage section 20, the number and arrangement of the guide sheaves 24, etc. may be different. For example, the guide sheave 24 may be provided midway through the guide rail 21. For example, the cord-like body 15 may be configured to be in contact with the guide rail 21 without providing the guide sheave 24. [Explanation of symbols]

[0071] 1. Pouring system 2. Chain 2a Rear end 2P Pile-shaped body (area where a pair of chains are interlocked) 3 Communication hole 4. Meshing piece 4a side plate 4b Middle Plate 5 Non-meshing link 5a side plate 5b Middle Plate 6 Connecting pin 7 Color 8 Tip insertion part 9 Drive mechanism 10 Motor 11 Reducer 12 Rotation axis 13 Sprocket 14 Drums 15 Cord-like body 16 Abutment 17 axis branch 20 Storage area 21, 21a~21g Guide rails 22 Rail plate section 23 Low friction material 24 Guide sheave 25 Support Frame 26 Connecting Frame 30 Tension adjustment mechanism 31 First Sheave 32 Fixtures 33 2nd Sheave 34 Connector 35 Slide section 36 cylinders 40 Drain supply mechanism 50 barges 51 Through hole D Drain material A anchor G. Ground

Claims

1. A pile-shaped body driving system comprising a pair of chains that mesh with each other to form a pile-shaped body, a pair of sprockets around which each of the chains is wound, a pair of rotating shafts that support each of the sprockets, and a drive mechanism that rotates and drives the pair of rotating shafts, a pair of guide rails for guiding the non-meshing regions of the chains; a pair of drums supported on the respective rotary shafts; and a pair of cord-like bodies wound around the respective drums and having their leading ends connected to the rear ends of the respective chains, When the pair of chains moves toward the longitudinal tip end, the pair of sprockets rotate in the forward direction, causing the chains to be pulled out from the guide rail, and the string-like body to be pulled by the chains and unwound from the drum, A pile driving system characterized in that when the pair of chains move toward the rear end in the longitudinal direction, the pair of sprockets rotate in opposite directions, causing the string-like body to be wound onto the drum and the chain to be pulled by the string-like body and pulled back along the guide rail.

2. 2. The pile driving system according to claim 1, further comprising a tension adjustment mechanism for maintaining the tension of the cord extending between the drum and the rear end of the chain within a predetermined range.

3. A pile-shaped body installation system as described in claim 1 or 2, wherein part of the path along which the string-shaped body moves is set to the same path as the path along which the chain moves along the guide rail.

4. 3. A pile driving system according to claim 1 or 2, wherein the storage section is provided with a guide sheave for guiding the string-like body.

5. A pile-shaped body driving system as described in claim 1 or 2, wherein a low-friction material is provided at the portion of the guide rail that constitutes the storage section that comes into contact with the chain, thereby reducing friction between the guide rail and the chain.

6. A pile-shaped body driving system as described in claim 1 or 2, wherein the guide rail is a storage section that stores multiple areas of the chain that are not engaged in a bent state.

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