Construction method, construction system, and attachment

Abstract

To perform proximity construction without using a dedicated press-in machine.SOLUTION: A pressing machine 10 includes a chuck frame 16 that is annular in plan view, and a pressing machine side chuck mechanism 17 that is supported by the chuck frame 16 and is configured to grip a general-purpose steel sheet pile to be pressed in. An attachment 200 for proximity construction includes an attachment side chuck mechanism 220 that grips a hat-shaped steel sheet pile Ph, and a gripped portion 210 that can be gripped by the pressing machine side chuck mechanism 17, and is provided such that the attachment side chuck mechanism 220 is disposed on a front side and a position of the gripped portion to be gripped is disposed on a rear side, with the two spaced apart in a fore-and-aft direction. The attachment 200 for proximity construction is gripped by the pressing machine side chuck mechanism 17, and proximity construction of the hat-shaped steel sheet pile Ph is performed. During the construction, the pressing machine 10 grips the attachment 200 for proximity construction, and proximity construction by pressing in is performed in a state in which the hat-shaped steel sheet pile Ph is gripped by the attachment side chuck mechanism 220 of the attachment 200 for proximity construction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a steel sheet pile installation method, installation system, and attachment. [Background technology]

[0002] In order to minimize gaps between the structure and the steel sheet piles, hat-shaped steel sheet piles, which are suitable for close construction, have traditionally been used to drive the steel sheet piles in a line as close as possible to the structure. This hat-shaped steel sheet pile requires a dedicated press-in machine specialized for close-in construction in order to be installed as close as possible to the structure (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-043016 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the pressing machine shown in Patent Document 1 is a dedicated machine for close-in construction using hat-shaped steel sheet piles, and cannot press in general steel sheet piles (such as U-shaped steel sheet piles). Therefore, when construction work other than close-in construction is also performed at a site, there is a problem that both a dedicated machine for close-in construction and a pressing machine for U-shaped steel sheet piles are required. In addition, since there are only a few existing aircraft dedicated to close-range construction, it has become difficult to secure the equipment itself.

[0005] An object of the present invention is to perform close-in construction without using a press-in machine specifically for close-in construction. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a construction method, A press-in machine including a chuck frame having an annular shape in a plan view and a press-in machine-side chuck mechanism supported by the chuck frame and configured to be able to grip a general-purpose steel sheet pile to be pressed in, The close-in construction attachment has an attachment-side chuck mechanism for gripping the hat-shaped steel sheet pile and a gripped portion that can be gripped by the press-fitting machine-side chuck mechanism, and is provided with the attachment-side chuck mechanism on the front side and the gripped portion at the rear side, spaced apart in the fore-and-aft direction, and is gripped by the press-fitting machine-side chuck mechanism to perform close-in construction of the hat-shaped steel sheet pile to a structure.

[0007] The present invention also provides a construction system, a press-in machine including a chuck frame having an annular shape in a plan view and a press-in machine-side chuck mechanism supported by the chuck frame and configured to be able to grip a general-purpose steel sheet pile to be pressed in; a close-in construction attachment having an attachment-side chuck mechanism for gripping a hat-shaped steel sheet pile and a gripped portion that can be gripped by the press-fitting machine-side chuck mechanism, the attachment-side chuck mechanism being located on the front side and a gripped position of the gripped portion being located on the rear side, the attachment being spaced apart in the front-to-rear direction, The press-in machine is characterized in that the close-in construction attachment is held by the press-in machine-side chuck mechanism to perform close-in construction of the hat-shaped steel sheet pile.

[0008] Furthermore, the present invention is characterized in that the close-range construction attachment used in the above construction method has the attachment-side chuck mechanism that grips the hat-shaped steel sheet pile and the gripped portion that can be gripped by the press-fit machine-side chuck mechanism, and is provided so that the attachment-side chuck mechanism is on the front side and the gripped position of the gripped portion is on the rear side, and is spaced apart in the fore-and-aft direction. [Effects of the Invention]

[0009] According to the present invention, hat-type steel sheet piles can be installed in close proximity using a press-in machine for general-purpose steel sheet piles by using an attachment, making it possible to eliminate the need for a press-in machine dedicated to close proximity installation. [Brief explanation of the drawings]

[0010] [Figure 1] This is a plan view of a close-in construction system including a press-in machine for U-shaped steel sheet piles holding an attachment. [Figure 2] FIG. 2 is a side view of the close-in construction system. [Figure 3] This is a plan view of a U-shaped steel sheet pile. [Figure 4] This is a plan view of a hat-shaped steel sheet pile. [Figure 5] FIG. 10 is a plan view of an attachment for close-in construction. [Figure 6] FIG. 10 is a right side view of the attachment for close-in construction. [Figure 7] FIG. 2 is a plan view showing a Z-shaped steel sheet pile and a chuck mechanism capable of gripping it. [Figure 8] FIG. 10 is a plan view of an exploded state of another attachment for close-range construction. [Figure 9] FIG. 10 is a side view of another close-in construction attachment in an exploded state. [Figure 10] FIG. 10 is a plan view of another attachment for close-range construction in a connected state. [Figure 11] FIG. 10 is a side view of another attachment for close-range construction in a connected state. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a plan view of a close-in construction system 100 as a construction system including a press-in machine 10 for a U-shaped steel sheet pile holding an attachment 200, and FIG. 2 shows a side view. In this embodiment, an example of a construction method for performing close-in construction of a hat-shaped steel sheet pile Ph is shown, in which a press-in machine 10 for U-shaped steel sheet piles, which is equipped with a press-in machine side chuck mechanism 17 for gripping a U-shaped steel sheet pile Pu, is used to grip an attachment 200 for close-in construction, which has an attachment side chuck mechanism 220 for gripping a hat-shaped steel sheet pile Ph and a gripped portion 210 that can be gripped by the press-in machine side chuck mechanism 17 for gripping the U-shaped steel sheet pile Pu. The press-fitting machine 10 and the attachment 200 constitute a close-in construction system 100 in combination with a reaction force stand 300 and a crawler device 400 as a self-propelled means, which will be described later.

[0012] [U-shaped steel sheet pile] Figure 3 is a plan view of the U-shaped steel sheet pile Pu. The U-shaped steel sheet pile Pu is a long steel material that has a uniform planar shape over its entire length as shown in Fig. 3. The U-shaped steel sheet pile Pu has a web Pu1, flanges Pu2 that extend obliquely from both ends of the web Pu1, and joints Pu3 that are provided at the tip of each flange Pu2. As shown in the figure, the U-shaped steel sheet pile Pu is formed into a substantially U-shape in plan view by a web Pu1 and flanges Pu2 on both sides. When a plurality of U-shaped steel sheet piles Pu are lined up and press-fitted, the joints Pu3 are connected to each other with the webs Pu1 of adjacent U-shaped steel sheet piles Pu protruding in alternately opposite directions.

[0013] [Hat-shaped steel sheet pile] Figure 4 is a plan view of the hat-shaped steel sheet pile Ph. The hat-shaped steel sheet pile Ph is a long steel material that has a uniform planar shape over its entire length as shown in Fig. 4. The hat-shaped steel sheet pile Ph has a web Ph1, flanges Ph2 that extend obliquely from both ends of the web Ph1, arms Ph3 that extend outward from the tip of each flange Ph2 in parallel with the web Ph1, and joints Ph4 and Ph5 provided at the tip of each arm Ph3.

[0014] As shown in the figure, the hat-shaped steel sheet pile Ph differs from the U-shaped steel sheet pile Pu in that it has arm portions Ph3 on both sides that are approximately parallel to the web Ph1. The hat-shaped steel sheet pile Ph is a steel sheet pile suitable for so-called close-in construction, in which the convex side of the convex web Ph1 is pressed into the ground with the web close to or in contact with a structure such as a building. A press-in machine designed specifically for close-in construction grips the arms Ph3 on both sides of the hat-shaped steel sheet pile Ph and presses the pile close to or in contact with the structure with the web Ph1 exposed to the outside.

[0015] In addition, in the case of close-range construction, the hat-shaped steel sheet piles Ph that are placed in parallel are all connected with the convex side of the web Ph1 facing the same direction toward the structure, so the joint Ph4 on one end side and the joint Ph5 on the other end side are structured so that they can be connected with the web Ph1 facing in the same direction.

[0016] [Press-in machine for U-shaped steel sheet piles] Next, the press-in machine 10 for U-shaped steel sheet piles used in the construction method of this embodiment will be described. As shown in Figures 1 and 2, the press-in machine 10 includes a saddle 12 having multiple clamps 11 arranged in a front-to-back manner for gripping an existing U-shaped steel sheet pile Pu, a slide frame 13 that is movable back and forth relative to the saddle 12, and a leader mast 14 that can rotate on the slide frame 13. In the following explanation, as shown in the figure, the side of the chuck frame 16 (described later) relative to the saddle 12 will be referred to as the "front," and the opposite side will be referred to as the "rear." Here, the chuck frame 16 can rotate around a vertical axis together with the leader mast 14, but it is assumed that the saddle 12 and the chuck frame are aligned in a straight line without rotating as shown in Figure 1. Furthermore, when facing forward, the left-hand side will be referred to as the "left," the right-hand side as the "right," the vertically upward direction will be referred to as the "upper," and the vertically downward direction will be referred to as the "lower."

[0017] Four clamps 11 are arranged in a row, one behind the other, hanging down from a saddle 12, and each clamp 11 can be driven by a hydraulic device (not shown) to grip and release the upper end of an existing U-shaped steel sheet pile Pu.

[0018] The leader mast 14 is erected on the slide frame 13 and is movable back and forth relative to the saddle 12. Furthermore, the leader mast 14 is supported on the slide frame 13 so as to be rotatable about an axis that extends in the vertical direction. A vertically extending rail structure 15 is provided on the front side of the leader mast 14, and a chuck frame 16 is supported via this rail structure 15 so that it can be raised and lowered. Inside the chuck frame 16, a press-fitting machine-side chuck mechanism 17 capable of gripping the U-shaped steel sheet pile Pu is provided.

[0019] Furthermore, a pair of upper and lower hydraulic cylinder devices 18 are provided on the left and right sides in front of the leader mast 14. The lower ends of the pair of upper and lower hydraulic cylinder devices 18 are connected to extension portions 141 that extend forward from the bottom of the leader mast 14. When the upper and lower hydraulic cylinder devices 18 are driven, the cylinder rods extend and contract, allowing the press-fitting machine-side chuck mechanism 17 to move up and down along the rail structure portion 15.

[0020] The chuck frame 16 is a ring-shaped frame in a plan view that surrounds the entire periphery of the press-fitting machine side chuck mechanism 17, and the press-fitting machine side chuck mechanism 17 is supported relative to the chuck frame 16 so that it can rotate around a vertical axis passing through its center. It should be noted that the term "annular" used here for the chuck frame 16 refers to any shape that can ensure the function of rotatably supporting the press-fitting machine-side chuck mechanism 17 on the inside, and the shape of the outer periphery of the chuck frame 16 does not have to be annular. Furthermore, since it is sufficient to rotatably support the press-fitting machine-side chuck mechanism 17, the chuck frame 16 may have a shape with a portion of the circumference interrupted, such as the letter "C" when viewed from above. The press-fitting machine-side chuck mechanism 17 has a pair of chucks 171, 172 that are concave and convex in plan view. The pair of chucks 171, 172 are arranged facing each other in the diameter direction inside the cylindrical chuck frame 16, and the U-shaped steel sheet pile Pu can be inserted into the gap between the pair of chucks 171, 172 to hold it. In the U-shaped steel sheet pile Pu, the convex side of the web Pu1 is facing the concave chuck 171, and the web Pu1 is gripped between a fixed claw provided at the bottom of the concave chuck 171 and an extendable movable claw provided at the bottom of the convex chuck 172.

[0021] As described above, the press-fitting machine-side chuck mechanism 17 provided in the press-fitting machine 10 for a U-shaped steel sheet pile has a structure for gripping the web Pu1 of the U-shaped steel sheet pile Pu from both the convex and concave sides, and therefore the configuration of the gripping mechanism is necessarily arranged on the convex side of the web Pu1. For this reason, even if the shape of the press-fitting machine-side chuck mechanism 17 provided in the press-fitting machine 10 for a U-shaped steel sheet pile is capable of gripping the hat-shaped steel sheet pile Ph, it is not possible to press-fit the hat-shaped steel sheet pile Ph with the convex side of the web Ph1 in close proximity to or in contact with a structure.

[0022] [attachment] Therefore, when performing close-in construction of a hat-shaped steel sheet pile Ph using a press-in machine 10 for a U-shaped steel sheet pile, the close-in construction attachment 200 is held by the press-in machine side chuck mechanism 17 to perform close-in construction of the hat-shaped steel sheet pile Ph. Fig. 5 is a plan view of the close-in construction attachment 200, and Fig. 6 is a right side view. Note that "upper," "lower," "front," "rear," "left," and "right" shown in Fig. 5 and Fig. 6 indicate the directions when the attachment 200 is gripped by the press-fitting machine-side chuck mechanism 17.

[0023] The attachment 200 has a gripped portion 210 that can be gripped by the press-fitting machine-side chuck mechanism 17 of the press-fitting machine 10 for U-shaped steel sheet piles, and an attachment-side chuck mechanism 220 that grips the hat-shaped steel sheet pile Ph. In the attachment 200, the gripped portion 210 is located on the rear side, and the attachment-side chuck mechanism 220 is located on the front side.

[0024] The grasped portion 210 has a roughly rectangular pillar-shaped body portion 211 aligned in the front-to-rear direction, with a recess 212 that is open upward and to the right, and a plate-shaped portion 213 aligned in the front-to-rear and up-to-down directions formed at the rear left of the recess 212. The thickness of the plate-shaped portion 213 in the left-right direction is uniform across the entire plate surface, and is thick enough to be inserted between the fixed claws provided at the bottom of the concave chuck 171 and the retracted movable claws provided at the bottom of the convex chuck 172. This allows the plate-shaped portion 213 to be inserted from below between the fixed claws of the concave chuck 171 and the movable claws of the convex chuck 172 and gripped. That is, the plate-shaped portion 213 corresponds to the position where it is gripped by the press-fitting machine-side chuck mechanism 17.

[0025] Attachment-side chuck mechanism 220 is provided on the front side of gripped portion 210. This attachment-side chuck mechanism 220 has a hanging portion 221 extending downward from the front end of gripped portion 210, and a pair of arms 222, 223 extending forward from the left and right side surfaces of hanging portion 221.

[0026] The hanging part 221 has a flat front surface, and faces the concave side of the hat-shaped steel sheet pile Ph when gripping the pile. The left and right arm portions 222, 223 are provided at their front ends with bent portions 224, 225 facing inward in the left-right direction so as to face each other, and the tips of the bent portions 224, 225 are provided with fixing claws 226, 227 hanging down.

[0027] Each of the fixed claws 226, 227 protrudes toward the front surface of the hanging portion 221. Movable claws (not shown) are provided on the front surface of the hanging portion 221 opposite each of the fixed claws 226, 227. Each of the movable claws can be advanced forward by, for example, a hydraulic mechanism, and can individually grip the arm portions Ph3 on both sides of the hat-shaped steel sheet pile Ph in cooperation with each of the fixed claws 226, 227.

[0028] As a driving source for the attachment side chuck mechanism 220, for example, after the press-fitting machine side chuck mechanism 17 grips the gripped portion 210 of the attachment 200, the hydraulic hose of the press-fitting machine side chuck mechanism 17 may be disconnected, and the hydraulic hose may be reconnected to the attachment side chuck mechanism 220 to supply hydraulic oil, thereby ensuring hydraulic pressure. Furthermore, the press-fitting machine 10 may be configured so that the leader mast 14 or the saddle 12 is provided with a hydraulic circuit for supplying hydraulic pressure to the attachment-side chuck mechanism 220 . Alternatively, hydraulic pressure may be supplied to the attachment side chuck mechanism 220 from a power unit that drives the hydraulic equipment of the press-fitting machine 10 through a dedicated hydraulic circuit for the attachment side chuck mechanism 220. The power unit may be an engine type, an electric type, or a hybrid type of these.

[0029] The attachment-side chuck mechanism 220 grips the hat-shaped steel sheet pile Ph with the web Ph1 of the hat-shaped steel sheet pile Ph protruding forward. The dimensions of each part are set so that, when the hat-shaped steel sheet pile Ph is gripped, the frontmost part of the attachment-side chuck mechanism 220, i.e., the front faces of the bending parts 224 and 225 at the tips of the left and right arm parts 222 and 223, are located rearward of the convex surface of the web Ph1. As a result, when the press-in machine-side chuck mechanism 17 for the U-shaped steel sheet pile grips the gripped portion 210 with the attachment-side chuck mechanism 220 facing forward, the convex side of the web Ph1 of the hat-shaped steel sheet pile Ph gripped by the attachment-side chuck mechanism 220 is positioned at the frontmost position. Therefore, by arranging the press-in machine 10 facing the structure, it becomes possible to press-in the convex side of the web Ph1 in a state close to or nearly in contact with the structure.

[0030] The attachment-side chuck mechanism 220 is provided spaced forward from the plate-like portion 213, which corresponds to the position gripped by the press-fitting machine-side chuck mechanism 17. Here, "spaced apart" means, for example, that the attachment-side chuck mechanism 220 has a portion extending in the front-rear direction between the front end of the plate-like portion 213 and the gripping position of the attachment-side chuck mechanism 220 (for example, the rear end of the fixed claws 226, 227). "Extending in the front-rear direction" here does not have to mean a portion extending parallel to the front-rear direction, but may also mean a portion extending in an oblique direction that causes a displacement in the front-rear direction between the front end of the plate-like portion 213 and the gripping position of the attachment-side chuck mechanism 220. Therefore, the hat-shaped steel sheet pile Ph held by the attachment side chuck mechanism 220 can be held further forward than the press-in machine side chuck mechanism 17, making it possible to easily bring the convex side of the web Ph1 close to a structure such as a wall and press it in.

[0031] [Reaction stand and crawler device] In the construction method of this embodiment, close-in construction is carried out in a state where the press-in machine 10 for a U-shaped steel sheet pile is supported on the reaction support stand 300. The reaction force stand 300 applies a reaction force to the supported press-in machine 10 by its own weight when the steel sheet pile is pressed into the ground.

[0032] 1 and 2, the reaction force stand 300 has an upright portion 310 on the upper front side that supports the press-fitting machine 10. The press-fitting machine 10 is supported on the reaction force stand 300 by clamping the upright portion 310 with a plurality of clamps 11. The structure of the upright portion 310 may be any shape that can be gripped by the multiple clamps 11 of the press-fitting machine 10.

[0033] The reaction force stand 300 is rectangular in plan view, and is equipped with outriggers 320 at its four corners. The outriggers 320 have legs that extend downward and touch the ground by hydraulic pressure, for example, and can support the reaction force stand 300 and the press-fitting machine 10 horizontally. Furthermore, a reaction weight (not shown) can be additionally provided to the reaction base 300. A reaction weight is additionally provided when the reaction force of the press-fitting is insufficient due to the weight of the reaction base 300 itself.

[0034] A pair of crawler devices 400 are attached to the front and rear of the reaction force stand 300 as self-propelled means. The crawler device 400 includes a frame (not shown), drive wheels and idlers supported by the frame, and a crawler belt 410 mounted around the frame. The drive wheels are rotationally driven by, for example, a hydraulic device, and can transport the crawler belt 410 to move the reaction force mount 300 in a direction along the crawler belt 410. The power unit that serves as the hydraulic drive source for the crawler device 400 may also serve as the power unit for the press-in machine 10. In this case, high-pressure hydraulic oil may be connected to hydraulic equipment that controls both the press-in machine 10 and the crawler device 400, and then power may be distributed to each of the press-in machine 10 and the crawler device 400. Alternatively, high-pressure hydraulic oil may be connected to hydraulic equipment for controlling the press-in machine 10, and distributed to the hydraulic equipment for the crawler device 400 via that hydraulic equipment. The power unit of the crawler device 400 may be prepared separately from the power unit of the press-in machine 10, and the crawler device 400 and the press-in machine 10 may be supplied with hydraulic pressure from independent power units. In either case, the power unit may be an engine type, an electric type, or a hybrid type of these.

[0035] Beams protrude in the front and rear directions from the front and rear of the reaction force stand 300. These are inserted into insertion ports provided in the frame of the crawler device 400, and the reaction force stand 300 and the crawler device 400 are connected using connecting pins. The front and rear crawler devices 400 each have a crawler belt 410 that is provided along the left-right direction, allowing the reaction force stand 300 and the press-fit machine 10 to move left-right. In addition, the orientation and direction of travel can be changed by varying the speed difference between the left and right crawler devices 400. Although the crawler device 400 can be attached to and detached from the reaction force stand 300 by removing the connecting pin, it is not essential that it be detachable.

[0036] [Procedure for adjacent construction] The procedure for adjacent construction will be explained below with reference to FIGS. First, a press-in machine 10 for a U-shaped steel sheet pile is lifted by a crane above the upright part 310 of a reaction support stand 300 equipped with crawler devices 400 at the front and rear, and the upright part 310 is grasped with a plurality of clamps 11, and the press-in machine 10 is mounted on the reaction support stand 300. Furthermore, the press-fitting machine 10 on the reaction force stand 300 extends the chuck frame 16 and the press-fitting machine-side chuck mechanism 17 forward by the slide frame 13. Then, the attachment 200 is attached to the press-fitting machine 10 by gripping the plate-shaped portion 213 of the gripped portion 210 of the attachment 200 between the fixed claws provided at the bottom of the concave chuck 171 and the extendable movable claws provided at the bottom of the convex chuck 172.

[0037] Next, the front and rear crawler devices 400 move the attachment-side chuck mechanism 220 to the press-in position of the first hat-shaped steel sheet pile Ph with the attachment-side chuck mechanism 220 facing the structure, and the crawler device 400 positions the attachment-side chuck mechanism 220 at the target position for press-in. At the press-in position, the outriggers 320 may be used to support the entire structure. Then, the lower end of the hat-shaped steel sheet pile Ph, which has been lifted by the crane with the web Ph1 facing forward, is inserted from above between the hanging part 221 of the attachment 200 and the fixed claws 226, 227 of the attachment-side chuck mechanism 220. Furthermore, the fixed claws 226, 227 and movable claws (not shown) grip the lower end of the left and right arm portions Ph3 of the hat-shaped steel sheet pile Ph.

[0038] The press-in machine 10 advances the convex side of the web Ph1 of the hat-shaped steel sheet pile Ph held by the attachment 200 by the slide frame 13 to a position where it is close to (abuts against, if possible) the structure S, and then lowers the chuck frame 16 by driving the up and down hydraulic cylinder device 18, thereby pressing the hat-shaped steel sheet pile Ph held by the attachment 200 into the ground. When the lower end of the attachment 200 descends to a position close to the ground, the attachment 200 temporarily releases the attachment 200 from its grip, and the chuck frame 16 is raised to grip a higher position again, and the pressing-in of the hat-shaped steel sheet pile Ph is repeated again. When the hat-shaped steel sheet pile Ph is pressed in to a predetermined depth, the front and rear crawler devices 400 move the hat-shaped steel sheet pile Ph to the adjacent pressing position, and the next hat-shaped steel sheet pile Ph is pressed in. At this time, the pressing-in is performed while connecting the joint Ph4 (or joint Ph5) of the hat-shaped steel sheet pile Ph that was pressed-in immediately before with the joint Ph5 (or joint Ph4) of the next hat-shaped steel sheet pile Ph. By repeating the above steps, the hat-shaped steel sheet piles Ph are continuously pressed into the pile.

[0039] 1, there is a case where a U-shaped steel sheet pile Pu is constructed in a state where it is not close to the structure S while a hat-shaped steel sheet pile Ph is constructed in close proximity. In that case, the hat-shaped steel sheet pile Ph is constructed in close proximity first, and then the U-shaped steel sheet pile Pu is constructed. In the above construction method, the press-in machine 10 is moved by a pair of front and rear crawler devices 400. Therefore, if the U-shaped steel sheet pile Pu is constructed in normal manner first, the crawler devices 400 will interfere, making it difficult to construct the hat-shaped steel sheet pile Ph in close proximity to the U-shaped steel sheet pile Pu.

[0040] For example, the construction of U-shaped steel sheet piles Pu is carried out so as to connect to the ends of a series of hat-shaped steel sheet piles Ph that have been constructed nearby. In this case, the press-in machine 10 for the U-shaped steel sheet pile Pu releases the state in which the press-in machine side chuck mechanism 17 has gripped the gripped portion 210, and removes the attachment 200. The press-in machine 10 presses in the U-shaped steel sheet piles Pu by using the reaction force of the reaction force stand 300 until the number of U-shaped steel sheet piles Pu reaches a number sufficient to obtain the necessary reaction force for pressing in the U-shaped steel sheet piles Pu.

[0041] Then, once the required number of U-shaped steel sheet piles Pu have been pressed in, the press-in machine 10 is lifted by a crane and separated from the reaction frame 300, and with multiple existing U-shaped steel sheet piles Pu held by each clamp 11, the remaining U-shaped steel sheet piles Pu are pressed in sequentially (see the press-in machine 10 at the bottom right of Figure 1). In this case, the gripping positions of the clamps 11 are moved back and forth every time one or two U-shaped steel sheet piles Pu are pressed in. That is, the press-in machine 10 grips the upper end of the existing pile with the clamp 11 to provide a reaction force, grips the new U-shaped steel sheet pile Pu with the press-in machine-side chuck mechanism 17, and raises and lowers the press-in machine-side chuck mechanism 17 with the up-and-down hydraulic cylinder device 18 to press the U-shaped steel sheet pile Pu into the ground. After the new U-shaped steel sheet pile Pu is pressed into a position adjacent to the existing pile in this way, the clamp 11 is temporarily released, the saddle 12 is raised, and the press-in machine 10 is self-propelled to the next position with the pressed-in new U-shaped steel sheet pile Pu being gripped by the press-in machine-side chuck mechanism 17 to provide support force. In this way, by alternately repeating the pressing-in of the new U-shaped steel sheet pile Pu and the self-propelling of the press-in machine 10, the new U-shaped steel sheet pile Pu is successively pressed into positions adjacent to the existing piles.

[0042] [Technical Effects of the Embodiments of the Invention] In the above construction method, a press-in machine 10 having a chuck frame 16 that is circular in plan view and a press-in machine side chuck mechanism 17 that is supported by the chuck frame 16 and is configured to be able to grip a U-shaped steel sheet pile Pu, which is a general-purpose steel sheet pile, is used to grip an attachment 200 for close-up construction, which has an attachment side chuck mechanism 220 that grips the hat-shaped steel sheet pile Ph and a gripped portion 210 that can be gripped by the press-in machine side chuck mechanism 17 that grips the U-shaped steel sheet pile Pu, to perform close-up construction of the hat-shaped steel sheet pile Ph. This eliminates the need for a rare press-in machine specifically designed for close-in construction, making close-in construction easier and more frequent, while also reducing construction costs. Furthermore, at a site where close-in construction and normal construction are carried out, it is only necessary to prepare the press-in machine 10 and attachment 200 for normal construction, which makes it possible to reduce the workload at the stage of preparing and transporting the equipment.

[0043] Furthermore, the close-in construction attachment 200 has an attachment-side chuck mechanism 220 provided in front of and spaced from the plate-like portion 213 which corresponds to the position gripped by the press-fitting machine-side chuck mechanism 17 . Therefore, for structures such as near walls that are difficult to approach due to the shape of the chuck frame 16, the attachment side chuck mechanism 220 and the grasped hat-shaped steel sheet pile Ph can be grasped further forward than the pressing machine side chuck mechanism 17, making it possible to easily bring the convex side of the web Ph1 close to the structure such as near a wall and press it in. This makes it possible to carry out adjacent construction more easily and properly.

[0044] Furthermore, in the above construction method, the hat-shaped steel sheet pile Ph is constructed in close proximity while the pressing machine 10 is supported by the reaction support 300, so that a special pressing machine with a dedicated clamp is not required to grasp the existing hat-shaped steel sheet pile Ph that has been constructed in close proximity, and it becomes possible to use the pressing machine 10 for the U-shaped steel sheet pile Pu.

[0045] In addition, in the above-mentioned close-in construction method, the hat-shaped steel sheet piles Ph are constructed close in distance by sequentially moving the press-in machine 10 to the press-in position using the crawler device 400, which is a self-propelled means. Therefore, it is not necessary to perform press-in while suspending and moving the press-in machine 10 with a crane, and it is possible to perform press-in of a plurality of hat-shaped steel sheet piles Ph continuously and highly efficiently. In particular, when the self-propelled means is a crawler device 400, it becomes possible to move the entire heavy reaction force base 300. Furthermore, with the crawler device 400, it is possible to move while minimizing the influence of the ground conditions at the site. Furthermore, when positioning the hat-shaped steel sheet pile Ph before the start of press-fitting, the position of the hat-shaped steel sheet pile Ph can be easily adjusted by self-propelling it with the crawler device 400. In addition, if it becomes necessary to correct the inclination of the hat-shaped steel sheet pile Ph during the pressing work, it may be necessary to adjust the pressing position or the position of the pressing machine 10.However, by using the crawler device 400 to move independently, it is possible to easily adjust the pressing position or the position of the pressing machine 10.

[0046] In addition, since a pressing machine 10 for U-shaped steel sheet piles is used as a general-purpose steel sheet pile, close-in construction can be performed using a pressing machine that is widely used in general, making close-in construction extremely easy, and enabling the frequency of construction to be increased while also further reducing construction costs.

[0047] Furthermore, the close-in construction system 100 that implements the above construction method does not require a press-in machine dedicated to close-in construction, which is rare, making close-in construction easier and suitable for cases where construction is frequently performed. It also makes it possible to reduce the cost of building the system. Furthermore, the close-in construction system 100 can be used with a small configuration at sites where close-in construction and regular construction are carried out, making it possible to reduce the burden of preparing and transporting system equipment.

[0048] Furthermore, the attachment 200 used for the above-mentioned close-in construction can be used with the commonly used press-in machine 10, making close-in construction easier, increasing the frequency of construction work and reducing construction costs.

[0049] [others] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. For example, in the embodiments, a component integrally formed from a single member may be replaced with a component divided into multiple members that are connected or fixed to each other. Furthermore, a component formed by connecting multiple members may be replaced with a component integrally formed from a single member. In addition, the details shown in the embodiments may be modified as appropriate without departing from the spirit of the invention.

[0050] For example, in the above-mentioned close-in construction, the U-shaped steel sheet pile Pu is exemplified as a general-purpose steel sheet pile, but the present invention is not limited to this, and other steel sheet piles, for example, Z-shaped steel sheet piles may be exemplified. Furthermore, a press-in machine for Z-shaped steel sheet piles may be used for close-in construction. FIG. 7 is a plan view showing the Z-profile steel sheet pile Pz and a press-fitting machine-side chuck mechanism 17A capable of gripping the Z-profile steel sheet pile Pz.

[0051] The Z-shaped steel sheet pile Pz is a long steel material that has a uniform planar shape shown in Fig. 7 over its entire length. The Z-shaped steel sheet pile Pz has a web Pz1, arms Pz2 that extend parallel to each other at an angle from both ends of the web Pz1, and joints Pz3 provided at the tip of each arm Pz2. The Z-shaped steel sheet pile Pz resembles a U-shaped steel sheet pile Pu that is divided in half in plan view. The Z-shaped steel sheet piles Pz are connected to each other by the joints Pz3 so that the bending directions of the arms Pz2 relative to the web Pz1 of adjacent Z-shaped steel sheet piles Pz are opposite to each other.

[0052] The press-fitting machine side chuck mechanism 17A is configured such that chucks 171A and 172A, which are convex in plan view, face each other with a web Pz1 interposed between them, and a movable claw provided at the bottom of one chuck 172A advances toward a fixed claw provided at the bottom of the other chuck 171A to grip the web Pz1.

[0053] The press-in machine for the Z profile steel sheet pile has the same configuration as the press-in machine 10 described above, except for the press-in machine side chuck mechanism 17A. Even when using such a pressing machine for Z-shaped steel sheet piles, it is possible to perform close-range construction of hat-shaped steel sheet piles Ph by holding the above-mentioned attachment 200 and using the reaction stand 300 equipped with the above-mentioned crawler device 400.

[0054] Further, instead of the crawler device 400, other self-propelled means may be used to carry out close-in construction of the U-shaped steel sheet piles Pu. For example, a track consisting of a pair of rails may be laid along the structure S, and track running wheels may be provided on the bottom side of the reaction frame 300. In this case, it is possible to press in the hat-shaped steel sheet piles Ph sequentially by moving the reaction frame 300 and the press-in machine 10 along the track each time one is pressed in. During pressing in, the entire structure may be supported by outriggers 320. The reaction force base 300 may be moved by providing a drive mechanism on the track running wheels, or by towing the reaction force base 300 with a winch or the like.

[0055] Furthermore, as the self-propelled means, an existing general-purpose steel sheet pile such as a U-shaped steel sheet pile Pu installed along the structure S may be used. For example, in FIG. 1, U-shaped steel sheet piles Pu are continuously installed perpendicular to the structure S, but instead, U-shaped steel sheet piles Pu are installed parallel to the structure S. In this case, the reaction force stand 300 is not used, the saddle 12 of the press-in machine 10 is oriented in the left-right direction, the clamps 11 grip the upper ends of multiple existing U-shaped steel sheet piles Pu that are installed parallel to the structure S, and the leader mast 14 is rotated so that the tips of the attachments 200 face the structure S. In this state, the attachment-side chuck mechanism 220 grips the hat-shaped steel sheet pile Ph, and installation is performed in close proximity to the structure S. That is, the press-in machine 10 grips the upper ends of the U-shaped steel sheet pile Pu with the clamps 11 to apply the reaction force, and then grips the new hat-shaped steel sheet pile Ph with the attachment-side chuck mechanism 220, and raises and lowers the attachment-side chuck mechanism 220 with the up-and-down hydraulic cylinder device 18 to press the hat-shaped steel sheet pile Ph into the ground. Furthermore, after the new hat-shaped steel sheet pile Ph is pressed in in this way, the pressed-in new hat-shaped steel sheet pile Ph is gripped by the attachment-side chuck mechanism 220 to provide support, and the clamp 11 is temporarily released, the saddle 12 is raised, and the press-in machine 10 is self-propelled in the direction toward the next press-in position to re-grasp the U-shaped steel sheet pile Pu. In this way, by alternately repeating the pressing-in of the new hat-shaped steel sheet pile Ph and the self-propelling of the press-in machine 10 along the existing U-shaped steel sheet pile Pu, the new hat-shaped steel sheet piles Ph are successively pressed in to positions adjacent to the existing piles.

[0056] [Other examples of attachments for close-up construction] Another example of an attachment for close-up construction will be described with reference to Figures 8 to 11. The attachment 200A for close-up construction described below has a configuration that is only partially different from the above-mentioned attachment 200 for close-up construction. For this reason, the attachment 200A for close-up construction will be described mainly in terms of the configuration that differs from the attachment 200 for close-up construction, and the common configuration will be assigned the same reference numerals as the attachment 200 for close-up construction and redundant explanations will be omitted.

[0057] This attachment 200A for close-range construction has a gripped portion 210A and an attachment side chuck mechanism 220A, and is characterized by a configuration that allows the front-to-rear distance between the attachment side chuck mechanism 220A and the gripped portion, which is the plate-shaped portion 213, to be adjusted. The front portion of the gripped portion 210A and the rear portion of the attachment side chuck mechanism 220A have connecting structures that connect them to each other, and apart from these connecting structures, they have the same configuration as the gripped portion 210 and attachment side chuck mechanism 220 described above. 8 to 11 indicate the directions when the attachment 200A is gripped by the press-fitting machine side chuck mechanism 17.

[0058] 8 and 9, the front end of the gripped portion 210A is provided with a pair of extension portions 215, 215 that extend forward along the left and right side surfaces. The left and right extension portions 215, 215 are the same height as the entire gripped portion 210A and are rectangular in side view. Furthermore, the left and right extension portions 215, 215 are spaced apart from each other in the left-right direction, and each extension portion 215 has two pairs of upper and lower connecting holes 216, 216 formed to penetrate the extension portions 215 along the left-right direction, arranged side by side in the front and rear.

[0059] On the other hand, an insertion portion 228 extending rearward is provided at the rear end of the attachment side chuck mechanism 220A. The insertion portion 228 is at the same height as the extension portion 215 and has a rectangular shape in a side view. The length of the insertion portion 228 in the front-rear direction is equal to or slightly shorter than the length of the extension portion 215. The width of the insertion portion 228 in the left-right direction is equal to or slightly narrower than the distance between the left and right extension portions 215 . Furthermore, a pair of upper and lower connecting holes 229, 229 are formed in the inserting portion 228 so as to penetrate along the left-right direction. The inner diameter of the pair of connecting holes 229, 229 and the height of the respective forming positions are equal to those of the pair of connecting holes 216, 216.

[0060] 10 and 11, with the heights aligned, the insertion portion 228 is inserted rearward between the pair of extension portions 215, 215, and the pair of connecting holes 229, 229 of the insertion portion 228 is positioned with either a pair of connecting holes 216, 216 at the front or rear of the pair of extension portions 215, 215, and two connecting pins 230 are inserted to connect the grasped portion 210A and the attachment-side chuck mechanism 220A. Fastening members such as bolts and nuts may be used instead of the connecting pins 230. In this case, if the pair of connecting holes 229, 229 are positioned and connected to the pair of rear connecting holes 216, 216, the front-to-rear distance between the attachment side chuck mechanism 220A and the plate-shaped portion 213 can be shortened, and if the pair of connecting holes 229, 229 are positioned and connected to the pair of front connecting holes 216, 216, the front-to-rear distance between the attachment side chuck mechanism 220A and the plate-shaped portion 213 can be lengthened.

[0061] In construction work near a structure such as a wall, it is necessary to position the hat-shaped steel sheet pile Ph by making complex adjustments to the sliding movement of the slide frame 13 of the press-in machine 10, the turning movement of the leader mast 14, and the rotation movement of the press-in machine side chuck mechanism 17. In this case, the operation pattern of the press-in machine 10 becomes very complex when the conditions of the construction site are also taken into consideration, so that it may not be possible to make sufficient adjustments with the operation of the press-in machine 10 alone. In such a case, the aforementioned distance adjustment mechanism in the front-rear direction of the close-up construction attachment 200A is effective.

[0062] For example, corners near walls are recessed locations, and the distance is greater than in normal straight-line construction. In such cases, there is a limit to how close the reaction frame 300 can be to the wall. Furthermore, the press-in machine 10 for general-purpose steel sheet piles is not designed for such close-range construction, so even if the attachment 200 for close-range construction, which does not have the aforementioned structure for adjusting the distance, is used, it may not be able to reach the corner. In such a case, if the attachment 200A for close-range construction is used, the distance can be compensated for by changing the connection state so that the distance becomes longer, making it possible to press the hat-shaped steel sheet pile Ph into the wall corner.

[0063] Furthermore, there are many press-in machines 10 for general-purpose steel sheet piles that are specially designed to fit the various sizes of general-purpose steel sheet piles. For the press-in machines 10 for various general-purpose steel sheet piles that are specially designed in this way, the attachment 200A for close-up construction can appropriately adjust the distance in the front-to-rear direction between the attachment-side chuck mechanism 220A and the plate-shaped portion 213, and the press-in machines 10 for various general-purpose steel sheet piles can more effectively press in the hat-shaped steel sheet piles Ph. Furthermore, there are many pressing machines 10 for general-purpose steel sheet piles that have different thicknesses of the chuck frame 16 in the front-to-back direction. Even in this case, the attachment 200A for close-up construction can appropriately adjust the front-to-back distance between the attachment side chuck mechanism 220A and the plate-shaped portion 213 according to the thickness of the chuck frame 16 in the front-to-back direction, making it possible to effectively press in the hat-shaped steel sheet pile Ph for each of the various pressing machines 10 for general-purpose steel sheet piles.

[0064] Furthermore, the attachment 200A for close-in construction can be used for various press-in machines 10 for general-purpose steel sheet piles that are specially designed for various sizes of general-purpose steel sheet piles or for various press-in machines 10 for general-purpose steel sheet piles that have different thicknesses in the front-to-rear direction of the chuck frame 16, and a highly versatile attachment 200A can be provided. Therefore, for example, at a construction site where various press-in machines 10 for general-purpose steel sheet piles have been introduced, the attachment 200A can be attached to an unused press-in machine 10 to perform close-in construction of a hat-type steel sheet pile structure, thereby improving work efficiency.

[0065] The above-described configuration for adjusting the longitudinal separation distance between the attachment-side chuck mechanism 220A and the plate-like portion 213 (the gripped portion) of the close-compartment construction attachment 200A is merely an example, and any other configuration that functions similarly may be used. For example, a rod-like portion extending longitudinally may be provided on either the gripped portion 210A or the attachment-side chuck mechanism 220A, and an insertion hole may be provided on the other, with the rod-like portion inserted into the insertion hole and secured at multiple positions in the longitudinal direction with fastening members such as bolts and pins. Alternatively, a plate-like portion extending toward the gripped portion 210A and the attachment-side chuck mechanism 220A may both be provided with a plate-like portion extending toward the other, with the respective plate-like portions overlapping and secured at multiple positions in the longitudinal direction with fastening members such as bolts and pins. Alternatively, a rail may be provided along the front and rear of either the grasped portion 210A or the attachment side chuck mechanism 220A, and a sliding portion that slides along the rail may be provided on the other, and the two may be fixed at multiple positions in the front and rear direction with fixing members such as bolts or pins.

[0066] Furthermore, in accordance with each of the above examples, the grasped portion 210A and the attachment side chuck mechanism 220A may be configured to be movable back and forth relative to each other, and may be provided with a drive source such as a motor or hydraulic cylinder that provides power for the movement between them. In the case of a motor, it is preferable that the motor is capable of position control and generates a holding torque to prevent movement at a desired position. In the case of a hydraulic cylinder, hydraulic pressure may be ensured in the same manner as in the case of the hydraulic mechanism that grips the hat-shaped steel sheet pile Ph with each of the fixed jaws 226, 227. In order to maintain the adjusted distance between the attachment-side chuck mechanism 220A and the plate-like portion 213 that is the gripped portion, a configuration that prevents the movement of pressure oil after adjustment may be provided. [Explanation of symbols]

[0067] 10 Press-fitting machine 11 Clamp 12 Saddle 13 Slide Frame 14 Leader Mast 141 Extension part 15 Rail structure 16 Chuck frame 17,17A Press-fit machine side chuck mechanism 18. Up and down hydraulic cylinder device 100 Close-in Construction System (Construction System) 171, 172, 171A, 172A Chuck 200,200A attachment 210,210A Grasped part 211 Torso 212 recess 213 Plate-shaped part 220,220A Attachment side chuck mechanism 221 Drooping part 222,223 Arm 224,225 Bend 226,227 Fixed claw 300 Reaction mount 310 Standing section 320 Outrigger 400 Crawler device (self-propelled means) 410 Crawler Belt Ph Hat-type steel sheet pile Ph1 Web Ph2 flange Ph3 arm Ph4,Ph5 fittings Pu U-shaped steel sheet pile (general-purpose steel sheet pile) Pu1 Web Pu2 flange Pu3 fitting Pz Z-shaped steel sheet pile (general-purpose steel sheet pile) Pz1 Web Pz2 arm Pz3 fitting S structure

Claims

1. A press-in machine including a chuck frame having an annular shape in a plan view and a press-in machine-side chuck mechanism supported by the chuck frame and configured to be able to grip a general-purpose steel sheet pile to be pressed in, A construction method characterized in that a close-in construction attachment having an attachment-side chuck mechanism for gripping a hat-shaped steel sheet pile and a gripped portion that can be gripped by the press-fitting machine-side chuck mechanism, the attachment-side chuck mechanism being located at the front and a gripped position of the gripped portion being located at the rear, and spaced apart in the front-to-rear direction, is gripped by the press-fitting machine-side chuck mechanism to perform close-in construction of the hat-shaped steel sheet pile to a structure.

2. 2. The construction method according to claim 1, wherein the hat-shaped steel sheet piles are constructed in close proximity with the press-in machine supported by a reaction frame.

3. The construction method according to claim 2, characterized in that the reaction frame is equipped with a self-propelled means, and the self-propelled means is used to move sequentially to the pressing-in positions of the hat-shaped steel sheet piles, thereby performing close-in construction of the hat-shaped steel sheet piles.

4. The construction method according to claim 1, wherein the general-purpose steel sheet pile is a U-shaped steel sheet pile or a Z-shaped steel sheet pile.

5. a press-in machine including a chuck frame having an annular shape in a plan view and a press-in machine-side chuck mechanism supported by the chuck frame and configured to be able to grip a general-purpose steel sheet pile to be pressed in; a close-in construction attachment having an attachment-side chuck mechanism for gripping a hat-shaped steel sheet pile and a gripped portion that can be gripped by the press-fitting machine-side chuck mechanism, the attachment-side chuck mechanism being located on the front side and a gripped position of the gripped portion being located on the rear side, the attachment being spaced apart in the front-to-rear direction, The press-in machine holds the attachment for close-in construction by a chuck mechanism on the press-in machine side to perform close-in construction of the hat-shaped steel sheet pile.

6. 2. An attachment for close-range construction used in the construction method according to claim 1, comprising: an attachment-side chuck mechanism for gripping the hat-shaped steel sheet pile; and a gripped portion that can be gripped by the press-fitting machine-side chuck mechanism, the attachment-side chuck mechanism being located on the front side and a gripped position of the gripped portion being located on the rear side, the attachment-side chuck mechanism being located on the front side and the gripped position of the gripped portion being located on the rear side, and the attachment-side chuck mechanism being located apart from the front side in the front-to-rear direction.

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