Press-in installation device and press-in installation method

Abstract

To provide a pressing-in immersion device and a pressing-in immersion method preventing a lifting machine from becoming larger in size and allowing an earth retaining wall to be assembled with improved workability.SOLUTION: A pressing-in beam 21 is placed in a position of an outer area of a centroid at an outer peripheral side than a plurality of positions which are on a straight line passing through the centroid position G of a ring piece 11 on an upper end side of the ring piece 11 constituting a pressing-in earth retaining wall 1 and evenly apart from the centroid position G. Further, connecting a wire rope 3 to the plurality of positions on the straight line passing through the centroid position G of the ring piece 11 and evenly apart from the centroid position G allows the ring piece 11 to be lifted right above the centroid position G of the ring piece 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for pressing in and installing a split-assembly type earth retaining wall. [Background technology]

[0002] A conventional press-in installation device for a split-assembly type earth retaining wall is known, for example, from the device described in Patent Document 1 below.

[0003] To explain briefly, this press-in installation device presses in and installs a cylindrical earth retaining wall that is made up of multiple ring pieces that are connected in the horizontal and vertical directions to form a split-assembly type earth retaining wall. In this press-in installation device, as shown in Figure 17 of the document, for example, each ring piece is assembled by lifting it up using a balance-like lifting device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4616582 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional press-in installation device, the ring piece is lifted using the balance-shaped lifting tool, so when the ring piece becomes large, the weight of the weight to balance the ring piece is enlarged accordingly, which increases the weight of the lifted object suspended by the jig on the balance, and this may lead to an increase in the size of the lifting machine for lifting the lifted object.

[0006] Furthermore, as the ring pieces became larger, the weight of the balance-shaped hanging device also became larger, which could interfere with the movement of workers assembling the retaining wall (assembling the ring pieces) on scaffolding set up inside the retaining wall, and could hinder the workers' work.

[0007] The present invention has been devised with a focus on such technical problems, and aims to provide an injection-in installation device and an injection-in installation method that can prevent the lifting machine from becoming too large and improve the ease of assembling the earth retaining wall. [Means for solving the problem]

[0008] In one embodiment, the pressing-in and sinking device according to the present invention is a pressing-in and sinking device for pressing in and sinking a cylindrical earth-retaining wall assembled by connecting a plurality of ring pieces formed in a roughly arc-like shape in the horizontal and vertical directions, which constitute a split-assembly type earth-retaining wall, the pressing-in and sinking device comprising: a cable body for lifting the plurality of ring pieces to be used for assembling the cylindrical earth-retaining wall; and a cable body for lifting and lowering the plurality of ring pieces in the vertical direction, which is arranged in parallel to the uppermost section of the plurality of ring pieces that are lifted by the cable body and connected to form the cylindrical earth-retaining wall. and a press-in girder that presses into the cylindrical earth retaining wall by pressing the upper end surface of each ring piece, wherein the cable is connected to a single point on the upper end side of each ring piece which is the center of gravity of each ring piece, or to multiple points equally spaced from the center of gravity on a line passing through the center of gravity, and extends in the vertical direction from these connected points to lift each ring piece, and wherein the press-in girder abuts against an off-center area radially outward from the center of gravity of each ring piece on the upper end surface of each ring piece.

[0009] Thus, according to the present invention, at the upper end side of the ring piece, the press-fit girder is arranged in an area outside the center of gravity that is on the outer periphery side (diametrically outer side) of a single location that is the center of gravity of the ring piece, or a plurality of locations that are equally spaced from the center of gravity on a line passing through the center of gravity. The ring piece can be lifted at the center of gravity by connecting the cable to a single location that is the center of gravity of the ring piece, or a plurality of locations that are equally spaced from the center of gravity on a line passing through the center of gravity. This allows the ring piece to be lifted from directly above without using a balance-shaped hoisting tool as in the conventional method, and even if the ring piece becomes large, there is no risk of the weight to be hung on the balance-shaped hoisting tool becoming large.

[0010] In addition, as another aspect of the pressing-in sinking device, it is desirable that each of the ring pieces is provided with a connecting hole for connecting each of the ring pieces in the vertical direction, and that the cable body is connected to each of the ring pieces via the connecting hole.

[0011] In this way, by connecting the cable to the ring piece through the connecting hole provided in the ring piece, there is no need to provide a separate connection hole for connecting the cable, etc. This reduces the number of steps required to process the ring piece and suppresses the increase in the installation cost of the earth retaining wall.

[0012] As yet another embodiment of the pressing-in installation device, it is desirable that the device further comprises a lifting jig attached to the upper end surface of each of the ring pieces, connecting the cable body to lift each of the ring pieces, and the cable body being connected to a single point on the lifting jig which is the center of gravity of each of the ring pieces, or to a plurality of points which are equally spaced from the center of gravity on a line passing through the center of gravity, and extending in the vertical direction from this connected point to lift each of the ring pieces.

[0013] In this way, by lifting the ring piece using the lifting jig, even if the connection hole for connecting the cable to the ring piece, such as the connection hole provided in the ring piece, overlaps with the press-in girder in the vertical direction, it is possible to connect the cable to the center of gravity of the ring piece and lift the ring piece in the vertical direction. This makes it possible to lift the ring piece from directly above without being restricted by the range of the pressed area of ​​the ring piece by the press-in girder or the arrangement of the connection holes, etc., and increases the versatility of the press-in installation device.

[0014] Furthermore, as yet another aspect of the pressing-in installation device, it is desirable that each of the ring pieces is provided with a connecting hole for connecting each of the ring pieces in the vertical direction, and that the hanging jig is attached to each of the ring pieces via the connecting hole.

[0015] In this way, by connecting the hanging jig to the ring piece via the connection hole provided in the ring piece, there is no need to provide a separate connection hole for connecting the hanging jig, etc. This reduces the number of steps required to process the ring piece and suppresses increases in the installation costs of the earth retaining wall.

[0016] As yet another aspect of the press-in installation device, it is desirable that the hanging jig has a reinforcing rib on a surface facing the press-in girder.

[0017] In this way, the stiffness of the lifting jig can be increased by providing a reinforcing rib for reinforcing the lifting jig on the surface of the lifting jig facing the press-fit girder. This suppresses deformation of the lifting jig that would cause it to roll up vertically upward due to the pulling force of the cable when lifting the ring piece, contributing to proper and stable lifting of the ring piece. Furthermore, the provision of the reinforcing rib can also contribute to improving the durability of the lifting jig.

[0018] In yet another aspect of the press-in installation device, it is preferable that the cord is connected to the reinforcing rib.

[0019] In this way, by connecting the cord to a reinforcing rib having a relatively high rigidity, the lifting stability of the ring piece can be improved, and the durability of the lifting jig can be improved.

[0020] From another viewpoint, one aspect of the present invention is a pressing-in and sinking method in which a cylindrical earth-retaining wall is formed by lifting a plurality of ring pieces formed in a roughly arc-like shape that constitute a split-assembly type earth-retaining wall with a cable, and connecting the plurality of ring pieces in the horizontal and vertical directions, and pressing in and sinking the cylindrical earth-retaining wall by pressing in the radially outer region of the upper end face of each ring piece arranged in parallel at the topmost level in the vertical direction with a press-in girder, wherein the cable is connected to the upper end side of each ring piece at a position that does not overlap with the press-in girder and is at a single location that is the center of gravity of each ring piece, or to a plurality of locations that are equally spaced from the center of gravity on a line passing through the center of gravity, and each ring piece is lifted by the cable extending in the vertical direction from each ring piece to assemble the cylindrical earth-retaining wall.

[0021] Thus, according to the present invention, at the upper end of each ring piece, the press-in girder is arranged on the outer side of a single location that is the center of gravity of each ring piece, or a plurality of locations on a line passing through the center of gravity that are equally spaced from the center of gravity, and the cable is connected to a single location that is the center of gravity of the ring piece, or a plurality of locations on a line passing through the center of gravity that are equally spaced from the center of gravity, and the ring pieces are lifted to assemble the retaining wall. Therefore, the ring pieces can be lifted from directly above without using a balance-shaped lifting device as in the conventional method. As a result, even if the ring pieces are large, there is no risk of the weights suspended from the balance-shaped lifting device becoming large.

[0022] In addition, as another aspect of the pressing-in sinking method, it is desirable that each of the ring pieces is provided with a connecting hole for connecting each of the ring pieces in the vertical direction, and that the cable body is connected to each of the ring pieces via the connecting hole.

[0023] In this way, by connecting the cable to the ring piece through the connecting hole provided in the ring piece, there is no need to provide a separate connection hole for connecting the cable, etc. This reduces the number of steps required to process the ring piece and suppresses the increase in the installation cost of the earth retaining wall.

[0024] Furthermore, as yet another aspect of the pressing-in installation method, it is desirable to further provide a lifting jig that is attached to the upper end surface of each of the ring pieces and connects the cable for lifting each of the ring pieces, and the cable is connected to a single point on the lifting jig that is the center of gravity of each of the ring pieces, or to a plurality of points that are equally spaced from the center of gravity on a line passing through the center of gravity, and extends in the vertical direction from this connected point to lift each of the ring pieces.

[0025] In this way, by lifting the ring piece using the lifting jig, even if the connection hole for connecting the cable to the ring piece, such as the connection hole provided in the ring piece, overlaps with the press-in girder in the vertical direction, it is possible to connect the cable to the center of gravity of the ring piece and lift the ring piece in the vertical direction. This makes it possible to lift the ring piece from directly above without being restricted by the range of the pressed area of ​​the ring piece by the press-in girder or the arrangement of the connection holes, etc., and increases the versatility of the press-in installation device.

[0026] Furthermore, as yet another aspect of the pressing-in installation method, it is desirable that each of the ring pieces is provided with a connecting hole for connecting each of the ring pieces in the vertical direction, and that the hanging jig is attached to each of the ring pieces via the connecting hole.

[0027] In this way, by connecting the hanging jig to the ring piece via the connection hole provided in the ring piece, there is no need to provide a separate connection hole for connecting the hanging jig, etc. This reduces the number of steps required to process the ring piece and suppresses increases in the installation costs of the earth retaining wall.

[0028] In yet another aspect of the press-in installation method, it is desirable that the hanging jig has a reinforcing rib on a surface facing the press-in girder.

[0029] In this way, the stiffness of the lifting jig can be increased by providing a reinforcing rib for reinforcing the lifting jig on the surface of the lifting jig facing the press-fit girder. This suppresses deformation of the lifting jig that would cause it to roll up vertically upward due to the pulling force of the cable when lifting the ring piece, contributing to proper and stable lifting of the ring piece. Furthermore, the provision of the reinforcing rib can also contribute to improving the durability of the lifting jig.

[0030] In still another aspect of the press-in installation method, it is preferable that the cord is connected to the reinforcing rib.

[0031] In this way, by connecting the cord to a reinforcing rib having a relatively high rigidity, the lifting stability of the ring piece can be improved, and the durability of the lifting jig can be improved. Effect of the Invention

[0032] According to the present invention, the conventional balance-shaped hoisting tool is no longer necessary, and the ring piece can be lifted from directly above. Therefore, even if the ring piece becomes large, there is no risk of the weight to be hung on the balance-shaped hoisting tool becoming large. As a result, it is possible to avoid the increase in size of the lifting machine due to the increase in the size of the weight to be hung on the balance-shaped hoisting tool.

[0033] In addition, by avoiding the need to hang a large weight on the balance-like hanging device that balances the ring piece during lifting, an appropriate movement path is ensured for workers assembling the retaining wall (assembling the ring pieces) on the scaffolding arranged inside the ring piece, thereby improving the workability of the workers. [Brief description of the drawings]

[0034] [Figure 1] 1 is a schematic diagram of a press-in installation device according to the present invention; [Diagram 2] FIG. 2 is a perspective view showing the first embodiment of the present invention, illustrating the lifted state of the ring piece shown in FIG. 1, as viewed obliquely from above. [Diagram 3] 3 is a plan view showing the lifted state of the ring piece shown in FIG. 2 as viewed from directly above. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Diagram 5] FIG. 11 is a perspective view showing a lifted state of the ring piece according to the second embodiment of the present invention, as viewed obliquely from above. [Figure 6] FIG. 1 is a plan view showing the lifted state of the ring piece as viewed from directly above. [Figure 7] FIG. 6 is a side view of the lifted state of the ring piece shown in FIG. 5 . [Figure 8] 7 is a cross-sectional view taken along line BB in FIG. 6. [Figure 9] FIG. 6 is a perspective view of the hanging jig shown in FIG. 5 . [Figure 10] 10 is a perspective view showing a state in which the hanging jig shown in FIG. 9 is attached to a ring piece. [Figure 11] FIG. 1 is a schematic diagram of a conventional press-in installation device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, embodiments of the press-in installation device and press-in installation method according to the present invention will be described in detail with reference to the drawings. In each of the following embodiments, the present invention is applied to press-in installation of a retaining wall for installation, which is made up of ring pieces of RC segments.

[0036] [First embodiment] 1 to 4 show a press-in installation device and a press-in installation method according to a first embodiment of the present invention. FIG. 1 shows a schematic diagram of the press-in installation device according to this embodiment. FIG. 2 shows a perspective view of the lifted state of the ring piece shown in FIG. 1, seen from diagonally above, FIG. 3 shows a plan view of the lifted state of the ring piece shown in FIG. 2, seen from directly above, and FIG. 4 shows a cross-sectional view of the press-in girder and ring piece cut along line AA in FIG. 3. In the explanation of each figure, the direction perpendicular to the press-in direction of the retaining wall for installation 1 is referred to as the "radial direction", and the direction around the press-in direction of the retaining wall for installation 1 is referred to as the "circumferential direction".

[0037] As shown in Fig. 1, this pressing and sinking device presses and sinks a cylindrical earth retaining wall 1 assembled by connecting a plurality of (five in this embodiment) ring pieces 11 (see Fig. 2) formed in a roughly arc shape constituting a cylindrical divided assembly type earth retaining wall in the horizontal and vertical directions. The earth retaining wall 1 is formed by stacking roughly cylindrical unit earth retaining walls 10 vertically on a cutting edge ring 12 installed at the bottom of the pit, each of which is made by connecting ring pieces 11 having a predetermined unit height in the circumferential direction. At this time, each ring piece 11 constituting the unit earth retaining wall 10 is suspended via a wire rope 3, which is a cable member, hung on a hook 26 connected to a jib 25 of a crawler crane 24 installed on the ground, and is placed on top of the unit earth retaining wall 10. Each unit retaining wall 10 is assembled using ring pieces 11, which are roughly arc-shaped divided pieces divided into an appropriate number in the circumferential direction, and each ring piece 11 is fastened to each other using bolts and nuts (not shown) and joint plates (not shown), etc.

[0038] That is, the pressing-in installation device has multiple hydraulic jacks 23 erected on a pressing girder 21, with ground anchors 22 as reaction force receivers, and the hydraulic jacks 23 are operated to apply a pressing force to the upper end surface of the assembled unit earth-retaining wall 10, thereby pressing in and installing the earth-retaining wall for installation 1. Also, above the pressing-in installation device, a bucket-type excavation means (e.g., a clamshell) (not shown) suspended from the jib 25 of a crawler crane 24 is kept on standby, and the clamshell (not shown) is repeatedly inserted and lifted inside the unit earth-retaining wall 10, thereby excavating and removing (lifting) soil from inside the unit earth-retaining wall 10.

[0039] In this way, the press-in installation device presses and sinks the earth retaining wall 1 into the ground in stages by assembling the earth retaining wall 1 for installation in a manner similar to adding unit earth retaining walls 10, while excavating and removing soil from the inside, and then pressing in the topmost unit earth retaining wall 10 with the annular press-in girder 21. Then, by repeating the assembly of the earth retaining wall 1 for installation, the excavation and removal of soil from the inside, and the pressing and sinking operation of the earth retaining wall 1 for installation, the earth retaining wall 1 for installation is sinks to a specified depth, and a vertical shaft is constructed. In addition, when forming a sinking earth retaining wall 1, as shown in Figure 2, for the unit earth retaining walls 101, 102 that overlap vertically, the circumferential joint J1 of each ring piece 11 of one unit earth retaining wall 101 and the circumferential joint J2 of each ring piece 11 of the other unit earth retaining wall 102 are circumferentially shifted so that they are not lined up in a row in the vertical direction.

[0040] 2 and 3, a plurality of connecting holes 110 for connecting (connecting) the ring pieces 11 overlapping in the vertical direction are provided at approximately the middle of the radial width on the upper end side of the ring piece 11 at approximately equal intervals along the circumferential direction. Each connecting hole 110 is a female threaded hole with a screw portion formed on the inside, and adjacent ring pieces 11 are connected to each other by fixing the joint plate or the like (not shown) to the ring piece 11 with the bolt (not shown) screwed into each connecting hole 110. Here, when lifting the ring piece 11, for example, as shown in FIG. 3, a bolt-like suspender 4 capable of suspending the ring piece 11 by connecting a wire rope 3, such as an eye bolt, is attached to a single location of the connecting holes 110 of the ring piece 11 that is the center of gravity G of the ring piece 11, or to a plurality of locations on a straight line L passing through the center of gravity G and equally spaced from the center of gravity G (in this embodiment, a pair of connecting holes 110a, 110b located on a straight line L passing through the center of gravity G). The ring piece 11 is then lifted by a wire rope 3 connected to a hoisting tool 4 screwed into the ring piece 11.

[0041] In this embodiment, as shown in FIG. 3, for example, a mode in which the hoisting tool 4 is attached to the connecting hole 110 provided on the upper end surface of the ring piece 11 using the connecting hole 110 for connecting the ring piece 11 is described as an example, but the attachment location of the hoisting tool 4 is not necessarily limited to the connecting hole 110 of the ring piece 11. In other words, depending on the specifications of the ring piece 11, the connecting hole 110 of the ring piece 11 may not be disposed at a single location that is the center of gravity G of the ring piece 11, or at multiple locations on a straight line L passing through the center of gravity G and equidistant from the center of gravity G. In this case, a mounting hole (not shown) for attaching the hoisting tool 4 may be provided on the upper end surface of the ring piece 11, separate from the connecting hole 110 of the ring piece 11, at a single location that is the center of gravity G of the ring piece 11, or at multiple locations on a straight line L passing through the center of gravity G and equidistant from the center of gravity G, and the ring piece 11 may be lifted by attaching the hoisting tool 4 to the mounting hole. In this way, the location where the suspender 4 is attached is not limited to the connecting hole 110 of the ring piece 11, but may be formed separately as necessary.

[0042] 3 and 4, in the press-in installation device according to this embodiment, the pressed region on the upper end side of the ring piece 11 that is pressed by the press-in girder 21 when the earth retaining wall 1 is pressed in is set on the outer periphery (radially outward) of the connecting hole 110 so as not to overlap with the connecting hole 110. More specifically, the pressed region is set in a region where the press-in girder 21 does not overlap with a single location that is the center of gravity G of the ring piece 11 when the earth retaining wall 1 is pressed in, or a plurality of locations (a pair of connecting holes 110a, 110b in this embodiment) that are equally spaced from the center of gravity G on a straight line L that passes through the center of gravity G.

[0043] In this embodiment, the ring piece 11 is set to have a strength such that the ring piece 11 will not be damaged by the shear stress acting from the press-in girder 21 even if the press-in girder 21 presses against the outer periphery (radial outer side) of the connecting hole 110 when the ring piece 11 is pressed in and set. For example, when the ring piece 11 is an RC segment as exemplified in this embodiment, the entire ring piece 11 is set to have a strength such that the ring piece 11 will not be deformed or damaged by the shear stress received from the press-in girder 21 when the press-in girder 21 presses against the area outer periphery (radial outer side) of the connecting hole 110 when the earth retaining wall 1 is pressed in and set, and it is possible to resist the pressing force of the press-in girder 21 arranged biased toward the outer periphery of the ring piece 11. On the other hand, when the ring piece 11 is a well-known steel segment, a metal vertical rib (not shown) embedded in the interior of the ring piece 11 along the vertical direction is set to overlap with the pressed area pressed by the press-in girder 21, making it possible to resist the pressing force of the press-in girder 21 which is positioned biased toward the outer periphery of the ring piece 11.

[0044] As described above, in the press-in installation device and press-in installation method according to this embodiment, the hoisting device 4 is screwed into a plurality of locations (a pair of connecting holes 110a, 110b) on the upper end side of the ring piece 11 at a position that does not overlap with the press-in girder 21 and that is provided on a straight line L passing through the center of gravity G of the ring piece 11 and that are equidistant from the center of gravity G. Then, by connecting the wire rope 3 to the hoisting device 4 attached to the ring piece 11, the ring piece 11 can be lifted above the center of gravity G by the wire rope 3 extending directly above the ring piece 11, and the sunken earth retaining wall 1 can be assembled.

[0045] (Effects of the first embodiment) The characteristic functions and effects of the press-in installation device and press-in installation method according to this embodiment will be specifically described below.

[0046] As shown in FIG. 11, according to the conventional press-in installation device, the press-in girder 21 is extended to the inside of the unit earth retaining wall 10. Therefore, it is difficult to connect the wire rope 3 directly above the ring piece 11 and lift it. Therefore, in the conventional press-in installation device, the ring piece 11 can be lifted by offsetting the position for lifting the ring piece 11 to the inside of the inner peripheral edge of the press-in girder 21 using a balance-shaped hoisting tool 40. However, in the case of such a balance-shaped hoisting tool 40, it is necessary to balance the weight of the ring piece 11 by placing a weight 41 on the opposite side of the ring piece 11. Therefore, as the ring piece 11 becomes larger (weight increases), the weight of the weight 41 also increases, which leads to an increase in the size of the crawler crane 24, which is a lifting machine, and there is still room for improvement. In addition, as the ring piece 11 becomes larger (heavier), the weight of ...

[0047] In contrast, in this embodiment, the press-fit girder 21 is disposed on the upper end side of the ring piece 11 at a single location that is the center of gravity G of the ring piece 11, or at a plurality of locations (a pair of connecting holes 110a, 110b) that are equidistant from the center of gravity G on a straight line L that passes through the center of gravity G. The wire rope 3 is connected to the pair of connecting holes 110a, 110b via the hoisting tool 4, so that the ring piece 11 can be lifted at the center of gravity G. This makes it possible to lift the ring piece 11 from directly above without using the balance-shaped hoisting tool 40 as in the conventional case, and even if the ring piece 11 is enlarged, there is no risk of the weight 41 suspended from the balance-shaped hoisting tool 40 becoming enlarged accordingly. As a result, it is possible to avoid an increase in the size of the lifting machine (crawler crane 24) that would be caused by an increase in the size of the weight 41 suspended from the balance-shaped hoisting tool 40.

[0048] Furthermore, by avoiding the need to increase the size of the weight 41 hung from the balance-like hanging device 40 that balances the ring piece 11 during lifting, an appropriate movement line is ensured for worker M who is assembling the sinking earth retaining wall 1 (assembling the ring piece 11) on the scaffolding B arranged inside the sinking earth retaining wall 1, thereby improving the workability of the worker M.

[0049] In this embodiment, the hoisting device 4 is attached to the connecting hole 110 provided in the ring piece 11, and the wire rope 3 is connected to the ring piece 11 via the connecting hole 110. Therefore, there is no need to provide a separate mounting hole or the like for mounting the hoisting device 4 to which the wire rope 3 is connected. As a result, the number of steps for processing the ring piece 11 is reduced, and the increase in the installation cost of the submerged earth retaining wall 1 can be suppressed.

[0050] Second Embodiment 5 to 10 show a second embodiment of the press-in installation device and press-in installation method according to the present invention, and this embodiment is a modification of the connection mode of the wire rope 3 to the ring piece 11 in the first embodiment. This embodiment is particularly effective for a ring piece 11 in which the pressed area pressed against the press-in girder 21 overlaps with each connecting hole 110. The basic configuration other than these modifications is the same as in the first embodiment. Therefore, the same reference numerals are used to denote the same configuration as in the first embodiment, and a description thereof will be omitted.

[0051] Fig. 5 shows a perspective view of the ring piece 11 in a lifted state seen from diagonally above, and Fig. 6 shows a plan view of the ring piece 11 in a lifted state seen from directly above. Fig. 7 shows a side view of the ring piece 11 in a lifted state shown in Fig. 5 seen from the side, and Fig. 8 shows a cross-sectional view of the press-fit girder and ring piece taken along line BB in Fig. 6. Fig. 9 shows a perspective view of the hanging jig 5 shown in Fig. 5 alone, and Fig. 10 shows a perspective view of the hanging jig 5 shown in Fig. 9 attached to the ring piece 11.

[0052] As shown in FIG. 6, this embodiment is applied to a ring piece 11 in which the pressed area on the upper end surface of the ring piece 11 pressed by the press-fit girder 21 is on the outer periphery side (radially outward) of the center of gravity G of the ring piece 11, and the pressed area pressed by the press-fit girder 21 overlaps with the connecting hole 110, to which it is difficult to connect the wire rope 3 by the hoisting tool 4 disclosed in the first embodiment. Specifically, in this embodiment, a hoisting tool 5 is attached to the upper end surface of the ring piece 11, and the wire rope 3 is connected to the hoisting tool 5 to lift the ring piece 11. In other words, in this embodiment, the hoisting tool 5 offsets the connection position of the wire rope 3 to the inner periphery side (radially inward) from the inner peripheral edge of the press-fit girder 21, and the wire rope 3 is connected to the hoisting tool 5, thereby connecting the wire rope 3 at the center of gravity G of the ring piece 11 and enabling lifting.

[0053] 5 to 10, the hanging jig 5 is integrally formed from an iron-based material into a plate-like shape forming a generally T-shape, and is fastened to the upper end surface of the ring piece 11 by a plurality of bolts 6. Specifically, the hanging jig 5 has a jig body 51 formed into a plate shape, a plurality of bolt through holes 52 provided in the jig body 51 and through which the shanks of the bolts 6 are inserted, and a reinforcing rib 53 arranged on the upper surface of the jig body 51 in a generally T-shape along the shape of the jig body 51.

[0054] As shown in Figs. 6, 9, 10, etc., the jig body 51 has an attachment base 511 overlapping the upper end surface of the ring piece 11, and an extension 512 extending to the side of the attachment base 511 corresponding to the inner circumferential side of the ring piece 11 and overlapping the center of gravity G of the ring piece 11, which are integrally formed. Note that the jig body 51 may be formed in a simple rectangular shape, but in this embodiment, the jig body 51 is formed in a generally T-shape with a minimum area while ensuring the interval between the bolt through holes 52 provided in the attachment base 511 and the interval between the second ribs 532 described later provided in the extension 512, thereby achieving weight reduction. This minimizes the increase in the lifting weight of the ring piece 11 (total weight including the hanging jig 5), and suppresses the increase in size of the crawler crane 24 (see Fig. 1) due to the increase in the lifting weight of the ring piece 11.

[0055] As shown in Figures 9 and 10, the bolt through hole 52 is provided at a position facing a pair of connecting holes (not shown) located on the outer periphery (radially outer side) of the straight line L passing through the center of gravity G among the connecting holes 110 of the ring piece 11. In this embodiment, the hanging jig 5 is attached using the pair of connecting holes (not shown) provided in the ring piece 11, and unnecessary drilling of the ring piece 11 is omitted, thereby reducing the number of processing steps for the ring piece 11. However, when the hanging jig 5 is attached to an attachment hole (not shown) provided other than the connecting holes 110 including the pair of connecting holes (not shown) according to the specifications of the ring piece 11, the bolt through hole 52 may be formed at a position corresponding to the attachment hole (not shown).

[0056] 6 to 10, the reinforcing rib 53 is integrally provided on the upper surface of the jig body 51, and is composed of a first rib 531 corresponding to a horizontal rib extending in the longitudinal direction at the mounting base 511 of the jig body 51, and a second rib 532 corresponding to a vertical rib extending along the extension part 512 of the jig body 51 so as to be perpendicular to the first rib 531. In addition to the reinforcing rib 53, a generally rectangular plate-shaped lower rib 54 extending along the width direction of the jig body 51 is protruded from the lower surface side of the jig body 51.

[0057] The first rib 531 is composed of a pair of protrusions consisting of a first inner rib 531a and a first outer rib 531b that extend parallel to each other with roughly the same length on either side of a pair of bolt through holes 52, and is provided so as to extend in a tangent direction to the arc shape of the ring piece 11 when the hanging jig 5 is attached to the ring piece 11. The first inner rib 531a and the first outer rib 531b both have the same height, and are each formed so as to be slightly higher than the height of the head of the bolt 6 for attaching the hanging jig 5 to the ring piece 11.

[0058] The second rib 532 is formed of a pair of protrusions consisting of a second left rib 532a and a second right rib 532b, which are connected to the side surfaces of the first inner rib 531a facing the extension portion 512 and extend parallel to both side edges of the extension portion 512 with approximately the same length at positions equidistant from the widthwise center line C (see FIG. 6). The second rib 532 is set to the same height as the first rib 531. In addition, the second left rib 532a and the second right rib 532b are provided with a plurality of circular connection holes 533 for connecting the wire rope 3, which are provided in the second left rib 532a and the second right rib 532b so as to face each other along the longitudinal direction of the second left rib 532a and the second right rib 532b. Among the pair of left and right connection holes 533, the end of the wire rope 3 is connected to a pair of connection holes 533 located on a straight line L passing through the center of gravity G of the ring piece 11, thereby making it possible to lift the ring piece 11 from directly above.

[0059] In this manner, in this embodiment, the hanging jig 5 is fixed to the upper end surface of the ring piece 11 by a plurality of bolts 6 (two in this embodiment) using the connecting holes 110, and the ends of the wire rope 3 are connected to a pair of left and right connecting holes 533 provided in the second rib 532 (the second left rib 532a and the second right rib 532b) of the hanging jig 5, respectively, to lift the ring piece 11. Specifically, first, the bolts 6 are inserted into the bolt through holes 52 provided in the jig body 51, and the bolts 6 are screwed into the connecting holes 110 in the upper end surface of the ring piece 11, thereby fixing the hanging jig 5 to the upper end surface of the ring piece 11. After that, both ends of the wire rope 3 hung on the hook 26 connected to the jib 25 of the crawler crane 24 are connected to the pair of left and right connecting holes 533 provided in the second rib 532 (the second left rib 532a and the second right rib 532b) of the hanging jig 5 fixed to the ring piece 11. As a result, the ring pieces 11 can be lifted from directly above at the center of gravity G via the hanging jig 5, and the ring pieces 11 can be assembled.

[0060] (Effects of the second embodiment) As described above, in this embodiment, the hanging jig 5 is attached to the upper end surface of the ring piece 11, and the ring piece 11 is lifted via this hanging jig 5. By lifting the ring piece 11 using the hanging jig 5 in this way, even if the press-in girder 21 of the press-in sinking device overlaps with a hole for connecting the wire rope 3 to the ring piece 11, such as the connecting hole 110, the wire rope 3 can be connected to the center of gravity position G of the ring piece 11 and lifted in the vertical direction. This makes it possible to lift the ring piece 11 from directly above without being restricted by the range of the pressed area of ​​the ring piece 11 pressed by the press-in girder 21 or the arrangement of the connecting hole 110, and therefore improves versatility.

[0061] Moreover, in this embodiment, the hanging jig 5 can be attached to the ring piece 11 via a connecting hole 110 provided in the ring piece 11. In this way, by connecting the hanging jig 5 to the ring piece 11 using the connecting hole 110, it becomes unnecessary to provide a separate hole or the like for connecting the hanging jig 5 on the upper end surface of the ring piece 11. This reduces the number of steps for processing the ring piece 11, and makes it possible to suppress an increase in the installation cost of the submerged earth retaining wall 1.

[0062] In this embodiment, a reinforcing rib 53 is provided on the upper surface of the lifting jig 5, i.e., on the surface facing the press-fit girder 21. In this manner, the reinforcing rib 53 for reinforcing the lifting jig 5 is provided on the surface of the lifting jig 5 facing the press-fit girder 21, thereby increasing the rigidity of the lifting jig 5. This suppresses deformation of the lifting jig 5 that would otherwise be caused by the pulling force of the wire rope 3 rolling up vertically upward when lifting the ring piece 11, thereby contributing to appropriate and stable lifting of the ring piece 11. Furthermore, the provision of the reinforcing rib 53 can also contribute to improving the durability of the lifting jig 5.

[0063] In this embodiment, the wire rope 3 is configured to be connectable to a pair of left and right connection holes 533 provided in the reinforcing rib 53 (the second left rib 532a and the second right rib 532b of the second rib 532). By connecting the wire rope 3 to the connection holes 533 provided in the reinforcing rib 53 (the second left rib 532a and the second right rib 532b of the second rib 532) having a relatively high rigidity, the lifting stability of the ring piece 11 can be improved, and the durability of the lifting jig 5 can be improved.

[0064] The present invention is not limited to the configurations exemplified in the above-described embodiments, and can be freely modified according to the specifications of the target object within the scope of the present invention.

[0065] In each of the above-mentioned embodiments, the press-in installation device and press-in installation method according to the present invention are exemplified as being applied to a sunken earth retaining wall 1 formed by assembling ring pieces 11 made of RC segments. However, it goes without saying that the press-in installation device and press-in installation method according to the present invention are not limited to the ring pieces 11 made of RC segments, and can also be applied to, for example, a sunken earth retaining wall formed by assembling ring pieces made of well-known steel segments. In addition, in such ring pieces made of steel segments, the connection holes 110 are each formed as a through hole, so the hoisting tool 4 is fastened with a nut, and the hoisting tool 5 is fastened with a bolt and a nut.

[0066] In addition, in each of the above embodiments, the wire rope 3 is connected to a plurality of points on a straight line L passing through the center of gravity G of the ring piece 11 and approximately equally spaced from the center of gravity G, that is, in the first embodiment, to the hoisting tool 4 attached to a pair of connecting holes 110a, 110b, and in the second embodiment, to a pair of connecting holes 533 provided in the hoisting tool 5 fixed to a pair of connecting holes (not shown), but the present invention is not limited to such a case. In other words, even when the wire rope 3 is connected to a single point that is the center of gravity G of the ring piece 11 or a single point on the hoisting tool 5 that is the center of gravity G of the ring piece 11, the ring piece 11 can be lifted from directly above. [Explanation of symbols]

[0067] 1... Submerged earth retaining wall (separate assembly type earth retaining wall) 10...Unit earth retaining wall 11...Ring piece 12…Cutting edge ring 110...Connection hole 21...Press-fit girder 22…Ground anchor 23...Hydraulic jack 24...Crawler crane (lifting machine) 25…Jib 26…Hook 3...Wire rope (cord) 4…Hanging device 5…Hanging jig 51...Jig body 511…Mounting base 512...Extension part 52...Bolt through hole 53…Reinforcing rib 531…First Rib 531a…First inner rib 531b…First outer rib 532…Second rib 532a…Second left rib 532b…Second right rib 533...Connection hole 6…Bolt C…Width direction center line G...Center of gravity position L: Straight line (straight line passing through the center of gravity)

Claims

1. A pressing and sinking device which presses and sinks a cylindrical earth retaining wall by lifting a number of ring pieces formed in a roughly arcuate shape which constitute a split-assembly type earth retaining wall by means of a cable extending vertically from above a circular press-in girder on the inner periphery of the press-in girder, and arranging the lifted ring pieces in parallel in the circumferential direction so that the outer periphery of the upper end face of each of the ring pieces overlaps with the inner periphery of the press-in girder below the press-in girder, The cable is connected to a plurality of points on the upper end side of each of the ring pieces that are equally spaced from the center of gravity on a line passing through the center of gravity of each of the ring pieces, and extends in the vertical direction from the connected points to lift each of the ring pieces, The press-fit girder is disposed radially outward from the connection point of the cable on the upper end surface of each of the ring pieces, and presses a circumferential region radially outward from the connection point of the cable. An injection sinking device characterized by:

2. The press-in installation device according to claim 1, Each of the ring pieces is provided with a connection hole for connecting the ring pieces in the vertical direction, The cord is connected to each of the ring pieces through the connecting holes. An injection sinking device characterized by:

3. The press-in installation device according to claim 1, The ring piece further includes a lifting jig attached to an upper end surface of each of the ring pieces, connecting the cable bodies to each of the ring pieces, and used for lifting each of the ring pieces. The cable is connected to a plurality of points on a line passing through the center of gravity of each of the ring pieces in the lifting jig, the points being equally spaced from the center of gravity, and extends in the vertical direction from the connected points to lift each of the ring pieces. An injection sinking device characterized by:

4. The press-in installation device according to claim 3, Each of the ring pieces is provided with a connecting member for connecting the ring pieces in the vertical direction. There are knot holes, The hanging jig is attached to each of the ring pieces via the connecting holes. An injection sinking device characterized by:

5. The press-in installation device according to claim 3 or 4, The hanging jig has a reinforcing rib on a surface facing the press-fit girder. An injection sinking device characterized by:

6. The press-in installation device according to claim 5, The cord is connected to the reinforcing rib. An injection sinking device characterized by:

7. A method of pressing and sinking a cylindrical earth retaining wall, comprising: lifting a plurality of ring pieces formed in a generally arcuate shape that constitute a split assembly type earth retaining wall by a cable extending vertically from above a circular press-in girder on the inner periphery side of the press-in girder; arranging the lifted ring pieces in parallel in the circumferential direction so that the outer periphery side region of the upper end face of each of the ring pieces overlaps with the inner periphery side region of the press-in girder below the press-in girder; and pressing and sinking the cylindrical earth retaining wall by pressing the outer periphery side region of the upper end face of each of the ring pieces with the press-in girder, the cable is connected to a plurality of points on the upper end side of each of the ring pieces at positions on the inner periphery side of the press-in girder that do not overlap with the press-in girder and that are equidistant from the center of gravity of each of the ring pieces on a line passing through the center of gravity of each of the ring pieces; the ring pieces are lifted by the cable extending in the vertical direction from each of the ring pieces; and the cylindrical retaining wall is assembled by pressing the circumferential regions of the plurality of ring pieces arranged in parallel in the circumferential direction radially outward from the connection points of the cable with the press-in girder. The injection submersion method is characterized by the above.

8. The injection method according to claim 7, Each of the ring pieces is provided with a connection hole for connecting the ring pieces in the vertical direction, The cord is connected to each of the ring pieces through the connecting holes. The injection submersion method is characterized by the above.

9. The injection method according to claim 7, A lifting jig is attached to the upper end surface of each of the ring pieces to connect the cable body and to lift each of the ring pieces, The rope is connected to a plurality of locations of the hanging jig that are equidistant from the center of gravity of each of the ring pieces on a line passing through the center of gravity of each of the ring pieces at positions that do not overlap with the press-fit girder, and each of the ring pieces is lifted by the rope extending in the vertical direction from the hanging jig. The injection submersion method is characterized by the above.

10. The injection submersion method according to claim 9, Each of the ring pieces is provided with a connection hole for connecting the ring pieces in the vertical direction, The hanging jig is attached to each of the ring pieces via the connecting holes. The injection submersion method is characterized by the above.

11. The method for injection submersion according to claim 9 or 10, The hanging jig has a reinforcing rib on a surface facing the press-fit girder. The injection submersion method is characterized by the above.

12. The method of claim 11, further comprising the steps of: The cord is connected to the reinforcing rib. The injection submersion method is characterized by the above.

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