Method of erecting earth retaining member and earth retaining member

Abstract

To provide an erection method of an earth retaining member capable of arranging the earth retaining member at an accurate angle.SOLUTION: The method includes an installation process for installing the earth retaining member in a hole provided in the ground, and a positioning process for regulating the position of the earth retaining member inserted into the hole by a support body attached to the earth retaining member, and in the positioning process, the position of the earth retaining member is regulated by bringing the support body into contact with a wall surface of the hole. The method may include a mounting step of mounting the support on the earth retaining member before the installation step.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present disclosure relates to a method for erecting an earth retaining member and the earth retaining member. [Background technology]

[0002] Patent Document 1 discloses a method of using pliers connected to an earth retaining member as a method of positioning the earth retaining member so that the height position of the earth retaining member is underground. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-309014 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when attempting to place an earth retaining member deep underground, it is difficult to place the earth retaining member at an accurate angle.

[0005] Therefore, in one aspect, the present invention aims to provide a method for erecting an earth retaining member that can position the earth retaining member at an accurate angle. [Means for solving the problem]

[0006] In one embodiment, an installation step of installing an earth retaining member in a hole provided in the ground; a positioning step of defining the position of the retaining member inserted into the hole by a support attached to the retaining member; Equipped with In the positioning step, the support body comes into contact with the side wall of the hole, thereby defining the position of the retaining member, thereby providing a method for erecting an earth retaining member. [Effects of the Invention]

[0007] According to one aspect, the present invention makes it possible to place an earth retaining member at a precise angle when the earth retaining member is to be placed deep underground. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a front view showing a process in the method for erecting an earth retaining member according to the first embodiment. [Figure 1A] FIG. 2 is a front view showing a process in the method for erecting an earth retaining member according to the first embodiment. [Figure 2] FIG. 2 is a front view showing the periphery of the anchor member. [Figure 2A] FIG. 2 is a front view showing the periphery of the anchor member. [Figure 2B] FIG. 2 is a front view showing the periphery of the anchor member. [Figure 3] FIG. 2 is a top view showing the configuration of the anchor member. [Figure 3A] FIG. 4 is a partially enlarged view of FIG. 3. [Figure 3B] FIG. 2 is a front view showing the configuration of the anchor member. [Figure 3C] FIG. 3C is a partially enlarged view of FIG. 3B. [Figure 3D] FIG. 10 is a front view showing a modified example of the anchor member. [Figure 4] FIG. 10 is a top view showing an example in which a stopper for an angle is added. [Figure 4A] FIG. 5 is an enlarged view of a portion of FIG. [Figure 4B] FIG. 10 is a front view showing an example in which a stopper for an angle is added. [Figure 4C] FIG. 4C is a partially enlarged view of FIG. 4B. [Figure 4D] FIG. 10 is a front view showing a modified example of the anchor member. [Figure 5] FIG. 10 is a top view showing an example in which the number of anchor members is increased. [Figure 6] FIG. 2 is a front view showing a plate-shaped anchor member. [Figure 7] FIG. 2 is a front view showing the configuration of a plate-shaped anchor member. [Figure 7A] FIG. 2 is a front view showing the configuration of a plate-shaped anchor member. [Figure 8] FIG. 10 is a front view showing a process in a method for erecting an earth retaining member according to a second embodiment. [Figure 8A] FIG. 10 is a front view showing a process in a method for erecting an earth retaining member according to a second embodiment. [Figure 9] FIG. 1 is a front view showing the periphery of the packer material. [Figure 10] FIG. 10 is a front view showing a process in a method for erecting an earth retaining member according to a third embodiment. [Figure 11] 11 is a front view showing the spacer (seen from the same direction as FIG. 10). FIG. [Figure 11A] 12 is a side view showing the spacer (viewed from the right in FIG. 11). FIG. [Figure 12] FIG. 10 is a front view showing an example in which the method for erecting an earth retaining member according to the present disclosure is applied to step excavation. [Figure 13] FIG. 1 is a front view showing an example in which a conventional method is applied to step excavation. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First Example) Figures 1 and 1A are front views showing the steps in the method for erecting an earth retaining member of the first embodiment, Figures 2 to 2B are front views showing the periphery of the anchor member, Figure 3 is a top view showing the configuration of the anchor member, Figure 3A is a partially enlarged view of Figure 3, Figure 3B is a front view showing the configuration of the anchor member, and Figure 3C is a partially enlarged view of Figure 3B.

[0010] As shown in FIG. 1, in step A1, a ruler 51 is installed in accordance with the planned construction position of an earth retaining member 10 (e.g., an H-shaped steel beam). In step A2, a hole 9 is formed in the ground by drilling using the ruler 51 as a guide, and a hardening material 91 such as cement milk grout is injected into the hole 9. Next, in step A3, a jig 3 (pliers are used in this example) is attached to the upper end (upper end in FIG. 1) of the earth retaining member 10 (e.g., an H-shaped steel beam). The jig 3 is attached to the earth retaining member 10 via a detachable part 31 (e.g., a shackle), and the detachable part 31 allows the jig 3 to be attached to and detached from the earth retaining member 10.

[0011] Next, in step A4, a pair of anchor members 20 are attached as supports to the side surfaces on the upper end side of the retaining member 10. The anchor members 20 may be attached at any location, and may be attached to a location other than the upper end side of the retaining member 10. Furthermore, the anchor members 20 may be installed in multiple stages in the depth direction.

[0012] As shown in Figures 2 to 3C, anchor member 20 has angle 21 (Figures 3A to 3C) to which pin 22 is attached, and hinge portion 23 whose left side surface in Figure 3C is joined to retaining member 10. Wire W is attached to angle 21 via pin 22. Angle 21 is attached to hinge portion 23 and is rotatable around rotation axis 23x of hinge portion 23.

[0013] As shown in FIGS. 3 and 3B, the pair of anchor members 20 are attached to the earth retaining member 10 at positions symmetrical with respect to the central axis thereof.

[0014] 1A, in step A5, ruler member 52 is installed in addition to ruler member 51, and retaining member 10 and jig 3 are lifted up and dropped into hole 9 to a predetermined depth. At this time, ruler members 51 and 52 function as guides that regulate the positions of retaining member 10 and jig 3.

[0015] In step A5, the wire W is loosened. Therefore, the angle 21 is maintained in a state rotated clockwise around the rotation axis 23X from the state in FIG. 3C (the closed state in FIG. 2). In step A5, the state in FIG. 2 is maintained, so that the anchor member 20 (angle 21) does not strongly interfere with the wall surface of the hole 9, and the earth retaining member 10 can be erected to a predetermined depth.

[0016] Next, as shown in FIGS. 1A and 2A, in step A6, the wire W is pulled to rotate the angle 21 around the rotation axis 23X, transitioning the anchor member 20 to the state shown in FIGS. 2A and 3 to 3C (the anchor member 20 is in an open state). At this time, the stopper function (not shown) of the hinge portion 23 restricts further rotation of the angle 21, maintaining the state shown in FIG. 2A even when the wire W is loosened. As shown in FIGS. 2A and 3 to 3C, the rotation of the angle 21 in step A6 presses the tip of the angle 21 against the wall of the hole 9. This secures the earth retaining member 10 to the anchor member 20 (angle 21) by the rulers 51 and 52 on the ground. As described above, the pair of anchor members 20 are attached symmetrically with respect to the central axis of the earth retaining member 10, so the earth retaining member 10 is positioned so that its central axis is approximately aligned with the central axis of the hole 9. This allows the earth retaining member 10 to be accurately erected vertically along the hole 9.

[0017] Next, in step A7, the jig 3 is removed from the retaining member 10 together with the detachable part 31 and pulled up. Also, the wire W is removed from the angle 21 together with the pin 22 and pulled up. At this time, the retaining member 10 may be temporarily supported by a wire, angle iron, or the like, if necessary.

[0018] As described above, in the first embodiment, by rotating the angle 21 in step A6, the anchor member 20 (angle 21) expands in the radial direction of the hole 9 and is pressed against the wall surface of the hole 9. For this reason, in step A5, the anchor member 20 (angle 21) has not yet been expanded in the radial direction of the hole 9, so the retaining member 10 can be erected to a predetermined depth without the anchor member 20 (angle 21) strongly interfering with the wall surface of the hole 9. Furthermore, with the anchor member 20 (angle 21) expanded in the radial direction of the hole 9, the retaining member 10 can be accurately erected in a direction along the hole 9 (for example, vertically).

[0019] FIG. 3D is a front view showing a modified example of the anchor member.

[0020] As shown in Fig. 3D, a rectangular parallelepiped angle 21A can be used instead of the angle 21. As shown in Fig. 3C, for example, the angle 21 can be formed by cutting the angle 21A. When the angle 21 is used with the corners of the angle 21A cut off, there is an advantage in that the angle 21 can be prevented from interfering with the wall surface of the hole 9 and scraping the wall surface during rotation of the angle 21 in step A6.

[0021] FIG. 4 is a top view showing an example in which an angle stopper has been added, FIG. 4A is a partially enlarged view of FIG. 4, FIG. 4B is a front view showing an example in which an angle stopper has been added, and FIG. 4C is a partially enlarged view of FIG. 4B.

[0022] As shown in FIGS. 4 to 4C, a hinge that functions as a stopper 25 may be attached to the angle 21. The stopper 25 is attached rotatably around a hinge axis 25x. In this case, when the anchor member 20 is closed, the stopper 25 is housed between the anchor member 20 and the retaining member 10. In other words, the positional relationship between the stopper 25 and the angle 21 is as shown in FIG. 4A.

[0023] When the anchor member 20 is in the open state, the stopper 25 rotates around the hinge axis 25x due to its own weight, reaching the state shown in Figures 4B and 4C. In this state, the stopper 25 comes into contact with the side surface of the retaining member 10 below the angle 21, restricting the angle of the angle 21.

[0024] By providing the stopper 25 in this manner, the angle of the angle 21 can be more firmly restricted.

[0025] FIG. 4D is a front view showing a modified example of the anchor member.

[0026] As shown in Fig. 4D, a rectangular parallelepiped angle 21A can be used instead of the angle 21. As shown in Fig. 4C, for example, the angle 21 can be formed by cutting the angle 21A. When the angle 21 is used with the corners of the angle 21A cut off, there is an advantage in that the angle 21 can be prevented from interfering with the wall surface of the hole 9 and scraping the wall surface during rotation of the angle 21 in step A6.

[0027] FIG. 5 is a top view showing an example in which the number of anchor members is increased.

[0028] 5, four anchor members 20 are attached to the side surface of the retaining member 10. By increasing the number of anchor members 20 in this way, the anchor members 20 can be positioned more accurately.

[0029] FIG. 6 is a front view showing a plate-shaped anchor member (an example of a plate material), and FIGS. 7 and 7A are front views showing the steps.

[0030] In the example shown in FIGS. 6 to 7A, a plate-shaped anchor member 20C is rotatably attached to the earth retaining member 10. In this example, the anchor member 20C can rotate under its own weight to the state shown in FIG. 7, but further rotation is restricted. In this case, when the earth retaining member 10 is erected and the anchor member 20C is rotated under its own weight to the state shown in FIG. 7, the earth retaining member 10 can be fixed to the rulers 51 and 52 on the ground and by the anchor member 20C. Then, as shown in FIG. 7A, the jig 3 is removed. Note that because the anchor member 20C is rotatable under its own weight, it is permitted for the anchor member 20C to come into contact with the wall surface of the hole 9 when the earth retaining member 10 is erected. However, even if the anchor member 20C comes into contact with the wall surface of the hole 9 when the earth retaining member 10 is pulled down, the anchor member 20C rotates in the upward direction and does not hinder the erection work.

[0031] (Second Example) 8 and 8A are front views showing steps in a method for erecting an earth retaining member according to a second embodiment, and FIG. 9 is a front view showing the periphery of the packer material.

[0032] As shown in Figure 8, in step A1, a ruler material 51 is placed in accordance with the position of the planned hole 9. In step A2, the hole 9 is formed by drilling, and a solidifying material 91 is injected into the hole 9. Next, in step A3, a jig 3 (pliers are shown in this example) is attached to the upper end of the retaining wall member 10 (the upper end in Figure 8). The jig 3 is provided with a detachable part 31, which allows the jig 3 to be attached to and detached from the retaining wall member 10.

[0033] 8A, in step B1, ruler member 52 is installed in addition to ruler member 51, and retaining member 10 is dropped to a predetermined depth into hole 9. At this time, ruler members 51 and 52 function as guides that regulate the positions of retaining member 10 and jig 3.

[0034] Next, in step B2, a pair of packer materials 40, each serving as a support body with an introduction pipe 41 attached, are dropped between the wall surface of the hole 9 and the retaining member 10, and installed in a predetermined position (on the upper end side of the retaining member 10). Note that the packer materials 40 may be attached to the retaining member 10 in advance before the retaining member 10 is dropped into the hole 9 to a predetermined depth. The installation (attachment) location of the packer materials 40 is arbitrary, and the packer materials 40 may be installed in a location other than the upper end side of the retaining member 10. The packer materials 40 may also be installed in multiple stages in the depth direction.

[0035] Next, in step B3, as shown in FIGS. 8A and 9, grout or the like is injected into the packer material 40 through the introduction pipe 41 to expand it, thereby fixing the position of the earth retaining member 10.

[0036] Next, in step B4, the jig 3 is removed from the retaining member 10 together with the detachable portion 31 and pulled up. At this time, the retaining member 10 may be temporarily supported by a wire, angle iron, or the like, if necessary.

[0037] In this way, in the second embodiment, by inflating the packer material 40 in step B3, the packer material 40 expands in the radial direction of the hole 9 and is pressed against the wall surface of the hole 9. Therefore, the retaining member 10 is positioned by the inflated packer material 40 between the ruler members 51, 52 on the ground and the wall surface of the hole 9, and the retaining member 10 can be accurately erected in a direction along the hole 9 (for example, vertically). Furthermore, in step B2, the packer material 40 is dropped in its uninflated state, so the packer material 40 can be easily installed in the predetermined position via the space between the wall surface of the hole 9 and the retaining member 10.

[0038] The number of packer materials 40 to be installed is arbitrary. The installation positions are also arbitrary, but for example, they can be installed in the same positions as the anchor members 20 in the first embodiment.

[0039] (Third Example) Figure 10 is a front view showing the steps in the method for erecting an earth retaining member of the third embodiment, Figure 11 is a front view showing the spacer (viewed from the same direction as Figure 10), and Figure 11A is a side view showing the spacer (viewed from the right side of Figure 11).

[0040] In step C1 shown in Figure 10, a pair of spacers 60 are attached as supports to the side surfaces of the upper end of the retaining member 10, as shown in Figures 10 and 11. The positions at which the pair of spacers 60 are attached may be the same as the positions at which the pair of anchor members 20 are attached in step A4. That is, the spacers 60 can be attached to the upper end side of the retaining member 10, but the attachment position is optional, and the spacers 60 may be attached to a position other than the upper end side of the retaining member 10. Furthermore, the spacers 60 may be installed in multiple stages in the depth direction.

[0041] As shown in FIGS. 11 and 11A, the spacer 60 has a protruding portion 60a that protrudes radially outward from the hole 9 when attached to the retaining member 10.

[0042] In step C2, a jig 3 (pliers are used in this embodiment) is attached to the upper end (upper end in FIG. 10) of the retaining member 10. The jig 3 is provided with a detachable portion 31, which allows the jig 3 to be attached to and detached from the retaining member 10.

[0043] 10, in step C3, the retaining member 10 is dropped into the hole 9 to a predetermined depth using the ruler members 51 and 52 as guides. At this time, the protruding portion 60a of the spacer 60 abuts against the wall surface of the hole 9, so that the spacer 60 also functions as a guide, similar to the ruler members 51 and 52. The hole 9 can be formed in the same manner as in the first embodiment.

[0044] 10, in step C4, the jig 3 is removed from the retaining member 10 together with the detachable portion 31 and pulled up. At this time, the retaining member 10 may be temporarily supported by a wire, angle iron, or the like, if necessary.

[0045] As described above, in the third embodiment, in step C3, the retaining member 10 can be dropped into the hole 9 using the ruler members 51, 52 and the spacer 60 as a guide. Furthermore, even after the retaining member 10 has been erected to a predetermined depth, the retaining member 10 is positioned by the ruler members 51, 52 on the ground and the spacer 60 abutting the wall surface of the hole 9. Therefore, the retaining member 10 can be accurately erected in a direction along the hole 9 (for example, vertically).

[0046] (Example of application to step excavation) The method of erecting an earth retaining member according to the present disclosure can be applied to a variety of situations, but as an example, an example of application to step excavation will be described.

[0047] FIG. 12 is a front view showing an example in which the method for erecting an earth retaining member according to the present disclosure is applied to step excavation, and FIG. 13 is a front view showing an example in which a conventional method is applied to step excavation.

[0048] As shown in FIG. 12, in the method of erecting an earth retaining member according to the present disclosure, when erecting the earth retaining member 10 (see "Earth Retaining Member Erection" in FIG. 12), the jig 3 is supported by ruler members 51 and 52 on the ground and supports (anchor members 20, packer materials 40, spacers 60) that abut the wall surface of the hole 9. This allows the earth retaining member 10 to be lowered deeper than in the past (see "Earth Retaining Member Erection" in FIG. 13). This allows the earth retaining member 10 to be erected in the portion of the earth retaining member length L0 that is originally required. After the earth retaining wall is constructed, the inside of the outer earth retaining wall 70 can be excavated to create a step.

[0049] In contrast, according to the conventional method, when the earth retaining member 10 is erected (see "When erecting the earth retaining member" in Figure 13), the jig 3 supports the earth retaining member 10 only by the ruler members 51 and 52 on the ground. This limits the depth at which the vertical accuracy of the earth retaining member 10 can be ensured, and the earth retaining member 10 can only be lowered to a shallow position. In other words, a portion corresponding to the length L1 (see Figure 13) that needs to be cut is created in the erected earth retaining member 10. This requires work to cut the length L1 during or after excavation.

[0050] In this way, when the method of erecting an earth retaining member according to the present disclosure is applied to step excavation, the earth retaining member 10 can be erected accurately to a deep position, thereby improving work efficiency.

[0051] As described above, this embodiment includes a positioning step in which the position of the retaining member 10 inserted into the hole 9 is determined by the support attached to the retaining member 10. This makes it possible to position the retaining member at an accurate angle.

[0052] Although the embodiments have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the claims. In addition, it is also possible to combine all or a plurality of components of the above-described embodiments.

[0053] For example, the direction in which the earth retaining member is installed (the direction of the hole) is not limited to the vertical (perpendicular) direction, and the method for erecting an earth retaining member according to the present disclosure can be applied to installing an earth retaining member in any direction. [Explanation of symbols]

[0054] 3 Jig 9 holes 10 Earth retaining members 20 Anchor member 40 Packer material 60 spacer W Wire

Claims

1. an installation step of installing an earth retaining member in a hole provided in the ground; a positioning step of defining the position of the retaining member inserted into the hole by a support attached to the retaining member; Equipped with In the positioning step, the support body contacts the wall surface of the hole, thereby defining the position of the retaining member.

2. The method for erecting an earth retaining member according to claim 1 , further comprising, before the installing step, an attaching step of attaching the support body to the earth retaining member.

3. 2. The method for erecting an earth retaining member according to claim 1, wherein in the installing step, the support body is brought into contact with a side wall of the hole by expanding the support body in a radial direction of the hole.

4. The method for erecting an earth retaining member according to claim 1, wherein the support is configured as an angle, a plate, a packer, or a spacer.

5. A retaining member having a support attached thereto, An earth retaining member whose position is determined when the support member contacts the side wall of a hole provided in the ground when the earth retaining member is installed in the hole.

Images