Earth retaining wall component and earth retaining structure for vertical hole

Abstract

To provide an earth retaining wall component which can be assembled into a ring shape close to a wall surface of a vertical hole in the vertical hole, and has an earth retaining function of expanding a ring diameter and propping against the wall surface of the vertical hole, and to provide an earth retaining structure of the vertical hole.SOLUTION: This ring structure has a plurality of ring constituting members 11 having three or more substantially equally divided lengths corresponding to the peripheral length of the wall surface W of the vertical hole H, and a plurality of connecting parts 12-14 for connecting these ring constituting members in a ring shape, and is constituted so that at least one connecting part 14 can be adjusted so that the connecting length becomes large. At least one other connecting part 13 is connectable and separable, and a plurality of ring constituting members 11 are arranged along the inner periphery of the vertical hole H, and are connected by a plurality of connecting parts 12-14, and are assembled as an assembling type ring body along the inner periphery of the wall surface W of the vertical hole H, and have the earth retaining function.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a retaining wall component for retaining earth on the wall surface of a vertical shaft excavated to repair a section of a buried pipe under a road to prevent the wall surface from collapsing, and to a retaining wall structure for the vertical shaft. [Background technology]

[0002] In the past, repairing buried pipes under roads involved digging a rectangular vertical hole, placing retaining boards on the four sides of the hole, placing cross beams (shoring) in the middle of the retaining boards on each side, and then placing beams or jacks between the opposing cross beams to support them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3015864 [Patent Document 2] Utility Model Registration No. 3183635 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-76490 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, in the construction method in which cross beams are placed between retaining plates and then beams or jacks are placed between opposing cross beams to support them, the beams or jacks divide the work space, so it is not possible to secure sufficient work space within the vertical hole for the workers repairing the part of the buried pipe to be repaired, which leads to a decrease in work efficiency.

[0005] The present invention aims to provide a retaining wall component and a retaining structure for a pit that can be assembled into a ring shape close to the wall surface within the pit, and that has a retaining function of bracing against the wall surface of the pit by expanding the ring diameter, and at the same time, has no cross beams or jacks that cross the middle of the pit, ensuring a large working space. [Means for solving the problem]

[0006] The retaining wall component according to the first aspect of the present invention has been devised to solve the above-mentioned problems, and is a retaining wall component for retaining earth on the wall surface of a vertical shaft excavated to repair a section of a buried pipe under a road to prevent the wall surface from collapsing. The retaining wall component comprises a plurality of ring constituent members each having a required length slightly shorter than the circumference of the vertical shaft, divided into three or more approximately equal lengths, and a plurality of connecting parts connecting the ring constituent members in a ring shape, wherein at least one of the connecting parts connecting the ring constituent members in a ring shape is adjustable so that the circumferential length of the connecting part increases, and at least one other connecting part connecting the ring constituent members in a ring shape is connectable and detachable, and the plurality of ring constituent members are arranged along the inner circumference of the vertical shaft and connected by the plurality of connecting parts to form a prefabricated ring body that fits along the inner circumference of the vertical shaft.

[0007] The retaining wall component of the second invention aspect of the present application has the same configuration as the first invention aspect, but in addition, the prefabricated ring bodies are stacked one on top of the other on the underside so that they are in close contact with the wall surface of the pit, forming a retaining wall cylinder that retains earth by adhering to the wall surface without the need for shoring.

[0008] The retaining wall component of the third invention aspect of the present application has the same configuration as the first invention aspect, but is configured such that the prefabricated ring body is in close contact with the wall surface of the vertical hole and acts as a support that presses against the wall surface of the vertical hole by adhering to the inside of the required number of retaining plates that are arranged vertically and in close contact circumferentially.

[0009] The retaining wall component of the fourth invention aspect of the present application has the same configuration as the second invention aspect, but in addition the ring component is made of one of circular pipe material, square pipe material, channel material, C-channel material or angle material, or is made of multiple of any one of these materials stacked one on top of the other, and further has a connecting portion that connects the ring component arranged on the upper side and the ring component arranged on the lower side to each other.

[0010] The retaining wall component of the fifth invention aspect of the present application has, in addition to the configuration of the second invention aspect, the ring component member has a retaining surface portion that is in close contact with the wall surface of the vertical hole, a channel-shaped connecting portion at either the upper or lower end of the retaining surface portion with a channel groove facing horizontally inward, and a horizontal plate portion at the other of the upper or lower end of the retaining surface portion that is inserted and engaged with the channel groove, and the ring component member located on the upper side and the ring component member located on the lower side are connected via the channel-shaped connecting portion and the horizontal plate portion.

[0011] The retaining wall component of the sixth aspect of the present invention has the same configuration as the third aspect of the invention, but the ring component is made of one of circular pipe material, square pipe material, channel material, C-channel material, and angle material, or is made of multiple pieces of one of these types stacked one on top of the other.

[0012] The retaining wall component of the seventh invention aspect of the present application has the same configuration as the first invention aspect, and in addition, the connecting portion, which can be adjusted to increase its circumferential length, is configured to consist of a double-ended screw member having a spanner engagement portion in the center and a pair of male threaded portions which protrude from both sides of the spanner engagement portion and have opposite threading directions, and a pair of long nuts fixed to the ends of each of the ring component members on both sides of the double-ended screw members and screwed onto one of the male threaded portions.

[0013] The retaining wall component of the eighth aspect of the present invention has the same configuration as the first aspect of the invention as described above, and further comprises a connecting portion that can be adjusted to increase its circumferential length, and includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and are fixed to either end face of the ring component members on both sides, a long nut fixed to a flange attached to the large-diameter pipe, and a long nut fixed to a flange attached to the small-diameter pipe, and the two threaded portions on both sides have opposite threading directions and include double-ended screw members that are screwed onto the pair of long nuts.

[0014] The retaining wall component of the ninth aspect of the present invention has the same configuration as the first aspect of the invention, and in addition, the connecting portion, which can be adjusted to increase its circumferential length, includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and fixed to either end face of the ring component members on both sides, and a bolt passed through a bolt-through hole in a flange attached to the large-diameter pipe is screwed into a nut fixed to the protruding end of an L-shaped flange attached to the small-diameter pipe.

[0015] The retaining wall component of the tenth aspect of the present invention has the same configuration as the first aspect of the invention, and in addition, the connecting portion, which can be adjusted to increase its circumferential length, includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and are provided from either end face of the ring component members on both sides, and a turnbuckle that is provided in parallel to the composite pipe and connects the ring component members on both sides.

[0016] The retaining structure for a vertical pit according to the eleventh aspect of the present invention has been devised to solve the above-mentioned problems, and is a retaining structure for retaining soil on the wall surface of a vertical pit excavated to repair a portion of a buried pipe under a road so that the wall surface does not collapse, The prefabricated ring bodies according to the first aspect of the invention are installed as supports at intervals in the depth direction of the vertical hole, and the prefabricated ring body installed at the shallowest position is supported in a suspended state by a support member which is an enclosing frame installed on the road surface or a flat plate placed in close contact around the vertical hole on the road surface, and the prefabricated ring bodies installed at depths other than the shallowest position are connected by a hanging member which hooks them to maintain a distance from the next-higher earth retaining plate support device, The assembly ring body presses the upper part of the retaining plate against the wall surface of the vertical hole, and the assembly ring body one step lower presses the lower part of the retaining plate against the wall surface of the vertical hole, The device has a plurality of upright posts erected inside the retaining plate support device and arranged at equal intervals around the circumference, and the upright posts are connected at the intersections with the ring component members of the first and second and subsequent retaining plate support devices. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a retaining wall component and a retaining structure for a vertical pit that can be assembled into a ring shape close to the wall of the vertical pit within the pit, and that has a retaining function of being braced against the wall of the pit by expanding the diameter of the ring, and at the same time, there are no cross beams or jacks that cross the middle of the pit, ensuring a large working space. [Brief explanation of the drawings]

[0018] [Figure 1] Figure 1 relates to the first embodiment of the present invention and shows a retaining wall component configured such that a circular prefabricated ring body consisting of multiple ring component members connected by connecting parts whose connection length is adjustable is stacked on top of each other and installed around the inner periphery of a vertical hole; Figure 1(A) is a plan view, Figure 1(B) is a partial plan view after the distance of the joint at part "B" in Figure 1(A) has been widened, Figure 1(C) is an exploded longitudinal cross-sectional view of one layer of retaining wall component, and Figure 1(D) is a retaining wall structure showing the state in which the retaining wall component is installed in the vertical hole. [Figure 2]Figure 2 relates to the second embodiment of the present invention, and shows a retaining wall component configured in a manner similar to the first embodiment, in which rectangular prefabricated ring bodies are installed around the inner periphery of a vertical hole in an overlapping manner. Figure 2(A) is a plan view, and Figure 2(B) is a retaining wall structure showing the state in which the retaining wall component has been installed inside the vertical hole. [Figure 3] Figures 3(A)-(D) are detailed diagrams of four specific examples of connecting portions that can expand the connection length between the ends of each pair of adjacent ring components in retaining wall components according to each embodiment of the present invention. [Figure 4] Figure 4 shows a support that can be used to suspend the topmost prefabricated ring body of the retaining wall component shown in Figure 2(B). Figure 4(A) is an oblique view showing a support that is installed on the road, and Figure 4(B) is an oblique view showing a support that is installed in a shallow excavation that has been made around a vertical hole in the road surface. [Figure 5] Figure 5 relates to a third embodiment of the present invention, and shows a retaining wall component in which an assembled ring body formed by connecting multiple ring component members with connecting parts whose connecting length is adjustable is used as support and is installed whenever the required depth is reached, and the required number of retaining plates are installed in a circumferential direction of the vertical hole so that they are in close contact with the wall surface of the vertical hole and are held down by the upper and lower supports, Figure 5(A) is a plan view and Figure 5(B) is a vertical cross-sectional view. [Figure 6] FIG. 6 is a plan view for explaining a retaining structure for a pit according to a fourth embodiment of the present invention. [Figure 7] FIG. 7 is a plan view for explaining a retaining structure for a pit according to a fifth embodiment of the present invention. [Figure 8] Figure 8 relates to the sixth embodiment of the present invention, and shows a retaining wall component configured in such a way that decagonal prefabricated ring bodies are stacked on top of each other around the inner periphery of a vertical hole, similar to the first embodiment. Figure 8(A) is a plan view, Figure 8(B) is a plan view of a pair of connectable connecting parts before they are connected, and Figure 8(C) is a plan view of the pair of connecting parts after they are connected. [Figure 9] FIG. 9 is a vertical cross-sectional view for explaining a retaining structure for a pit according to a seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, each embodiment of the retaining wall component and the retaining structure for a vertical pit according to the present invention will be described.

[0020] The retaining wall component of the present invention and this embodiment is a retaining wall component for retaining earth on the wall surface of a vertical shaft excavated to repair the portion of a buried pipe under a road to prevent the wall surface from collapsing.

[0021] [Earth-retaining wall component A according to the first embodiment] FIG. 1 shows a retaining wall component A according to a first embodiment.

[0022] This earth-retaining wall component A has a plurality of ring-shaped components each having a required length slightly smaller than the perimeter of the vertical hole, which is divided into three or more approximately equal lengths, in order to retain the earth on the wall surface of the vertical hole that is excavated to repair the portion of the buried pipe G under the road so that the wall surface does not collapse, and a plurality of connecting parts that connect the ring-shaped components, At least one connecting part that connects the ring constituent members in a ring shape is configured to be adjustable so that the circumferential length of the connecting part can be increased, and at least one other connecting part that connects the ring constituent members in a ring shape is configured to be connectable and detachable, and a plurality of ring constituent members are arranged along the inner circumference of a vertical hole and connected by a plurality of connecting parts to be assembled into a prefabricated ring body that fits along the inner circumference of the vertical hole, and the prefabricated ring bodies are stacked one after another on the underside so as to be in close contact with the wall surface of the vertical hole, forming a cylindrical body for a retaining wall that retains earth in close contact with the wall surface without the need for shoring (claims 1 and 2). This is described in detail below.

[0023] The retaining wall component A is composed of a circular prefabricated ring body 1 assembled along the inner circumference of the pit H using ring component members 11 and connecting parts 12-14, and installed in an overlapping state from the top of the pit to near the bottom.

[0024] The retaining wall components A are not assembled as prefabricated ring bodies outside the flat circular pit H, but are assembled inside the pit H. The reason for this is that the first prefabricated ring body 1 is installed at the upper end of the wall surface of the pit H when the pit H is shallowly excavated, for example to a depth of 1 m, and prefabricated ring bodies are installed at deeper positions each time the pit H is excavated to a certain depth; therefore, a prefabricated ring body assembled outside the pit H cannot be installed inside the pit H.

[0025] The assembly ring body 1 shown in Figure 1 is a one-block ring-shaped assembly in which multiple pipe materials (three in the figure) that are approximately quarter-circular arc shaped when viewed from above are stacked vertically and welded together to ensure a large retaining area.

[0026] The retaining wall component A shown in Figure 1 is configured as a cylindrical retaining wall body in which prefabricated ring bodies 1 are stacked one on top of the other on the underside so that they are in close contact with the wall surface of the pit H, and which directly contacts the wall surface to retain soil, and does not require shoring (it also has the function of shoring).

[0027] When the assembled ring body 1 is arranged in close contact or proximity to the inner circumference of the vertical hole H, it comprises four ring constituent members 11 each having an arc length that is shorter than the length of one-quarter of the arc in a plan view by the length of one connecting member, and four connecting members 12-14 for connecting the four ring constituent members 11 in a ring shape.

[0028] The prefabricated ring body 1 is assembled by arranging four ring constituent members 11 along the inner circumference of a vertical hole and connecting them with four connecting parts 12-14. The prefabricated ring body 1 may also be an arc-shaped body divided into three parts.

[0029] The four connecting portions 12-14 shown in Figure 1 are not identical in configuration, and connecting portion 12 is a joint that can be bent on the ring plane. Connecting portions 13, 13 are joints that can be connected and separated but cannot be bent. Connecting portion 14 is a joint whose connecting length can be adjusted to increase the ring diameter after assembly of the prefabricated ring body 1. As shown in Figure 1(B), a blind plate 16 is provided on the outside of the four connecting portions 12-14 so as to extend from the end of one of the ring constituent members 11.

[0030] The connecting portion 12 is constructed by flattening each end of a pair of adjacent ring constituent members 11 to form a flat portion, stacking the flat portions one on top of the other, and passing a bolt through a through hole in the center of the flat portions and fastening them with a nut.Even if the connecting length of the connecting portion 14 is expanded and the circumferential compression pressure increases, the connecting portion 12 does not bend toward the center due to its relationship with the connecting portions 13 and 14, and has the freedom to slightly displace the connected state so that it bulges in the centrifugal direction.

[0031] The connecting portion 13 has a function of butting the ends of a pair of adjacent ring constituent members 11 together and clamping the outer wall surfaces of the butted portions together.

[0032] The connecting portions 14 have the functions of connecting the opposing ends of the ring constituent members 11, of adjusting the connecting length, and of preventing inward bending even when circumferential compressive pressure is generated. The connecting portions 14 have the function of adjusting the connecting length when the retaining wall constituent member A is suspended in the pit H, thereby enabling the outer diameter of the ring of the retaining wall constituent member A to be expanded.

[0033] The connecting portion 14 shown in Figure 1 may be replaced with any of the connecting portions 14B-14D shown in Figures 3(B)-(D), in which case the planar shape of the vertical hole H to be excavated should correspond to the shape of the connecting portion 14B-14D.

[0034] 1(A) and 1(D), the retaining wall components A are stacked downward and assembled together to form a cylindrical retaining wall. The retaining wall components A are made by welding three pipe materials, each with a central angle of approximately 90 degrees, one above the other to form a block, to form four ring components 11, which are connected by four connecting parts 12, 13, and 14 to form a prefabricated ring body 1, and the prefabricated ring body 1 is then stacked and assembled underneath the prefabricated ring body 1 in a connected state as the vertical hole H is excavated.

[0035] The pipe material that makes up the ring component 11 is made by bending circular pipe material (aluminum pipe material or hot-dip galvanized iron pipe material) into an arc with a central angle of approximately 90 degrees inside the vertical hole H. Instead of a block of three overlapping circular pipe material, the ring component 11 may be in the form of no overlap, two overlapping, or four or more overlapping, and further, instead of a block of three overlapping circular pipe material, square pipe material, channel material, C-channel material, or angle material may be used.

[0036] Upper and lower connecting members 15 The retaining wall component A is configured such that ring components 11 are arranged circumferentially close to the wall surface W of the pit H, connected by connecting parts 12, 13, and 14, and assembled into a prefabricated ring body, which is then brought close to the wall surface W and, as shown in Figure 1(C), the connecting length of connecting parts 14 is increased to expand the ring diameter so that it is in close contact with the wall surface W, and prefabricated ring bodies are assembled and stacked below the prefabricated ring body fixed tightly to the wall surface of the pit, as shown in Figure 1(B), and these are stacked one below the other and connected to the upper one by upper and lower connecting members 15 (for example, connecting plates and tapping screws), forming a cylindrical earth-retaining wall body that is in close contact with the wall surface W and retains earth. This type of earth-retaining wall component does not require shoring and has the earth-retaining function of combining retaining plates and shoring.

[0037] The retaining wall component A, which is installed first and closest to the ground, is suspended at four points around the circumference of the retaining wall component A shown in Figure 1 by four suspension members (e.g., chains, ropes, or thick wires) 73 that hang down from the support 70 or 80 into the pit H, for example, using support 70 shown in Figure 4(A) or support 80 shown in Figure 4(B). Note that the number of suspension points may be three, and the support 70 or 80 can be modified as appropriate so that there are three suspension points.

[0038] The support 70 shown in Figure 4(A) consists of four pillars 71 erected at four equal points around the periphery of the vertical hole H and cross-shaped cross beams 72 that span the top ends of the four pillars 71, and hangs the retaining wall component A at four points around the circumference using four hanging members 73. The cross-shaped cross beams 72 are bolted to the intersections and the top ends of the four pillars 71.

[0039] The support 80 shown in Figure 4(B) is used to excavate the pit H at night and lay a steel plate over the pit H during the day to ensure road use. For this reason, the support 80 is installed so as not to protrude from the road surface, and the retaining plate P is installed inside the pit H so as not to protrude from the road surface.

[0040] The support 80 consists of a four-piece assembled annular section 81 housed in an annular groove carved into the road surface around the periphery of the vertical hole H, and four horizontal, short beam sections 82 housed in grooves extending from four equal positions around the circumference of the annular groove toward the center of the vertical hole H.Four hanging members 83 hanging from the base ends of each beam section 82 lift up the retaining wall component A shown in Figure 1 at four circumferential points.

[0041] The above-described connecting portion 14 is an example, and the following four structures are given as specific examples. (First type of connection structure) The connecting portion 14A shown in Figure 3(A), whose connecting length can be adjusted, consists of a pair of long nuts 14a, 14b welded to the ends of each ring component 11 on both sides, and a double-ended threaded member 14c that is threadedly engaged with the pair of long nuts 14a, 14b. The double-ended threaded member 14c has a spanner engaging portion 14c1 in the center that can be turned with a wrench, and a pair of male threaded portions 14c2, 14c3 protruding from both sides of the spanner engaging portion 14c1. The pair of male threaded portions 14c2, 14c3 are wound in opposite directions. Therefore, as shown in Figure 1(A), the retaining wall component A is placed in the vertical hole H with its small outer diameter, and a retaining plate P is inserted into the gap between the retaining wall component A and the wall surface of the vertical hole H. Then, by rotating the spanner-engaging portion 14c1 of the connecting portion 14A so that the pair of male threads 14c2, 14c3 shortens the engagement length (removes) from the pair of long nuts 14a, 14b, the connecting length can be increased. The connecting portion 14A is configured to connect the ring components on both sides while limiting bending, even though increasing the circumferential compressive pressure. As a result, the retaining wall component A's outer diameter increases, allowing it to brace against the retaining plate P, as shown in Figure 1(B).

[0042] (Second type of connection structure) 3(B), the connecting portion 14B whose connecting length can be adjusted includes a composite pipe in which a large-diameter pipe 14b1 and a small-diameter pipe 14b2 are slidably fitted together and secured to either end face of the ring components 11 on both sides, and includes a long nut 14b4 secured to a flange 14b3 attached to the large-diameter pipe 14b1 and a long nut 14b6 secured to a flange 14b5 attached to the small-diameter pipe 14b2, and includes a double-threaded member 14c threaded onto the pair of long nuts 14b4, 14b6, with the two threaded portions 14b4 and 14b6 on both sides having threading directions opposite to each other. The connecting portion 14B is configured to connect the ring components on both sides without bending even when compressive pressure is generated in the circumferential direction. When the connecting portion 14B rotates the screw members 14c at both ends in the direction of unscrewing them from the long nuts 14b4 and 14b6, the outer diameter of the retaining wall component A increases, allowing it to brace against the retaining plate P, as shown in Figure 1(B).

[0043] (Third type of connection structure) The connecting portion 14C, whose connecting length can be adjusted as shown in Figure 3(C), includes a composite pipe in which a large-diameter pipe 14c1 and a small-diameter pipe 14c2 are slidably fitted together and secured to either end face of the ring components 11 on both sides. A bolt 14c4 is threaded through a bolt-through hole in a flange 14c3 attached to the large-diameter pipe 14c1 and is threaded into a nut 14c6 fixed to the protruding end of an L-shaped flange 14c5 attached to the small-diameter pipe 14c2. The connecting portion 14C is configured to connect the ring components on both sides without bending even when circumferential compressive pressure is generated. When the bolt 14c4 is rotated in the direction of unscrewing from the nut 14c6, the outer diameter of the retaining wall component A increases, allowing it to brace against the retaining plate P, as shown in Figure 1(B).

[0044] (Fourth type of connection structure) 3(D), the connecting portion 14D whose connecting length can be adjusted includes a composite pipe in which a large-diameter pipe 14d1 and a small-diameter pipe 14d2 are slidably fitted together and are fixed to either end face of the ring constituent members 11 on both sides, and further includes a bolt 14d4 passed through a bolt-through hole in a flange 14d3 attached to the large-diameter pipe 14d1 and a bolt 14d5 passed through a bolt-through hole in a flange 14d5 attached to the small-diameter pipe 14d2, the bolts 14d4 and 14d5 having threading directions opposite to each other, and a turnbuckle 14d6 threadedly engaging the bolts 14d4 and 14d5. The connecting portion 14D is configured to connect the ring constituent members on both sides without bending even when compressive pressure is generated in the circumferential direction. When the connecting portion 14D rotates the turnbuckle 14d6 in the direction of disengaging from the bolts 14d4 and 14d5, the outer diameter of the retaining wall component A increases, allowing it to brace against the retaining plate P, as shown in Figure 1(B).

[0045] 3A to 3D are shown as examples of specific configurations of the connecting part 14 that can adjust the connecting length. However, the present invention is not limited to these. For example, the connecting part can be configured to vary the connecting length by rotating a worm wheel and linearly moving the worm that meshes with the worm wheel.

[0046] It should be noted that the connecting portions 12 and 13 can be replaced by the connecting portion 14 .

[0047] [Earth-retaining wall component B according to the second embodiment] Figure 2 shows a longitudinal cross-section of a second embodiment of the earth-retaining wall component B. The vertical hole H2 is rectangular in plan view. This earth-retaining wall component B includes a ring component 1B, which has an earth-retaining surface 17 that fits tightly against the wall surface of the vertical hole, connecting portions 18 at both ends of the earth-retaining surface 17, a channel-shaped connecting portion 19 with an inward-facing horizontal channel groove at either the top or bottom of the earth-retaining surface 17, and a horizontal plate portion 20 at the other of the top or bottom of the earth-retaining surface 17 that is inserted into and engages with the channel groove. Four earth-retaining surface portions 17 are assembled into a frame shape by the connecting portions 18, and the upper and lower ring components 11B are connected vertically via the channel-shaped connecting portion 19 and the horizontal plate portion 20. This earth-retaining wall component B is based on claims 1, 2, and 5.

[0048] The retaining wall component B is composed of a ring component 11B having an earth retaining surface 17, which is a flat plate that fits horizontally against the wall surface of the pit H2, connecting portions 18 provided on both ends of the earth retaining surface 17, and upper and lower connecting members 19, 20 provided along the lower edge of the flat plate, and four ring component members 11B are assembled into a square cylindrical prefabricated ring body 1B inside the pit H2, and the prefabricated ring body 1B is connected to the prefabricated ring body 1B installed above every 50-70 cm of the pit H2 dug.

[0049] [Third embodiment: earth retaining wall component] FIG. 5(A) shows an earth retaining wall component C according to a third embodiment of the present invention, where FIG. 5(A) is a plan view and FIG. 5(B) is a vertical cross-sectional view. This retaining wall component C has a plurality of ring constituent members, each having a required length slightly shorter than the circumference of the vertical hole, divided into three or more approximately equal lengths, and a plurality of connecting parts that connect the ring constituent members in a ring shape, in order to retain earth to prevent the wall surface of the vertical hole being excavated to repair the portion of the buried pipe G to be repaired under the road from collapsing. At least one connecting part that connects the ring constituent members in a ring shape is configured to be adjustable so that the circumferential length at that connecting part is longer, and at least one other connecting part that connects the ring constituent members in a ring shape is configured to be connectable and separable. The plurality of ring constituent members are arranged along the inner circumference of the vertical hole and connected by the plurality of connecting parts to form a prefabricated ring body that follows the inner circumference of the vertical hole, and the prefabricated ring body is configured to be a support that fits tightly against the wall surface of the vertical hole and presses against the inside of the required number of retaining plates that are lined up vertically in close contact with each other in the circumferential direction (Claims 1 and 3). Details are provided below.

[0050] This retaining wall component C is configured so that within a circular vertical pit H, which is circular in plan view, four ring component members 11C, which are shaped like a quarter-circular arc in plan view, connecting parts 12C-14C, and upper and lower connecting members (not shown), an assembled ring body 1C, which is a support structure, is installed in a suspended state via the upper and lower connecting members every 50-70 cm of the vertical pit H, and multiple retaining plates P, which are arranged along the wall surface W of the vertical pit H, are inserted so that they are pressed against the upper and lower assembled ring bodies 1C and are in close contact with the wall surface W of the vertical pit H.

[0051] [Fourth embodiment: earth retaining wall component] Fig. 6 shows a plan view of the earth-retaining wall component D of the fourth embodiment. Since the earth-retaining wall component D is rectangular, the vertical hole H2 to be excavated as the target of application has a rectangular planar shape that is required to be larger than that of the earth-retaining wall component D. This earth-retaining wall component D is based on claims 1 and 3.

[0052] The retaining wall component D is made by assembling a prefabricated ring body into a square frame, which consists of four angle-shaped ring components 21, which are formed by dividing a square ring made of rounded material that is smaller than the horizontal cross-sectional shape of the vertical hole H3 into four, and four connecting parts 22, 23 that connect the opposing ends of each ring component 21 when the ring component components 1 are arranged in a square ring shape. The ring component components 21 and the connecting parts 22, 23 can be connected with elongated holes and bolts to increase the length of the frame sides.

[0053] The four angle-shaped ring components 21 and four connecting parts 22, 23 are assembled into a prefabricated ring body, and each time a vertical hole is dug, the prefabricated ring body is stacked and connected to the lower part of the prefabricated ring body installed above, thereby forming a cylindrical shape that can be configured in the same way as the retaining wall component of the first embodiment.

[0054] [Fifth embodiment: earth retaining wall component] 7 shows a plan view of the earth-retaining wall component E of the fifth embodiment. Since the earth-retaining wall component E is hexagonal, the vertical hole H3 to be excavated as the target of application has a planar shape that is hexagonal and required to be larger than the earth-retaining wall component 3. This earth-retaining wall component E is based on claims 1 and 3.

[0055] The retaining wall component D consists of four "U"-shaped ring component members 31, which are formed by dividing a rounded hexagonal ring shape that is smaller than the horizontal cross-sectional shape of the vertical hole H3 into four, and four connecting parts 32, 33 that connect the opposing ends of each ring component member 31 when the ring component members 31 are arranged in a hexagonal ring shape.

[0056] The connecting portion 32 has the same configuration as the connecting portion 14A shown in Fig. 3(A), but can be replaced with any of the connecting portions 14B-14D shown in Fig. 3(B)-(D). The connecting portion 33 has the same configuration as the connecting portion 12 shown in Fig. 1, but can be replaced with any of the connecting portions 14A-14D shown in Fig. 3(A)-(D).

[0057] The retaining wall component 4 can be expanded in diameter by increasing the connection length of the two connecting parts 32, and is positioned inside a plurality of retaining plates P arranged closely along the wall surface W of the vertical hole H3, and is configured to be able to brace against the plurality of retaining plates P by expanding its diameter.

[0058] The four ring constituent members 31 and four connecting parts 32, 33 are assembled into an assembly ring body, and each time a vertical hole H3 is excavated, the assembly ring body is stacked on top of the assembly ring body installed above and connected to the lower part, thereby forming a cylindrical shape similar to the retaining wall constituent material of the first embodiment.

[0059] [Sixth embodiment: earth retaining wall component] 8(A) shows a plan view of the retaining wall component F of the sixth embodiment. The pit H4 to be excavated as the application object is decagonal.

[0060] The retaining wall component F is a decagonal ring-shaped assembly ring body assembled as support from eight of the ten divided ring components 41, two connecting parts 42, and six connecting parts 43 of a rounded decagonal ring shape that is smaller than the horizontal cross-sectional shape of the vertical hole H4, and the assembly ring bodies that serve as support are connected to the underside of the assembly ring body installed above so that they are hung at intervals of 50-70 cm each time the vertical hole H4 is dug down, for example, by 50-70 cm, and retaining plates P are inserted so that they are pressed against the upper and lower assembly ring bodies.

[0061] The two connecting portions 42 have substantially the same configuration as the connecting portion 14D shown in Fig. 3(D). The connecting length of the connecting portions 42 is the same as the length of one side of the decagon of the retaining wall component 4.

[0062] As shown in Figure 8(B), the connecting portion 43 is formed by assembling assemblies having opposite connecting elements 43a, 43b at both ends of the ring constituent member 41 in a chain fashion as shown in Figure 8(C), and can limit the degree of freedom of the connecting angle between the ring constituent members 41 when connected to each other to, for example, 5 degrees. The connecting elements 43a, 43b have a metal fitting with a bolt-through hole welded to the end of the ring constituent member 41, a rod-shaped portion protruding diagonally from the outer end of this metal fitting, and a channel-shaped position restricting portion welded to the ring constituent member 41 at a position away from the metal fitting, and are connected to each other with bolts and nuts by overlapping the metal fittings, and the rod-shaped portion is loosely fitted into the opposing channel-shaped position restricting portion so as to allow a swing angle of, for example, about 5 degrees (no reference numeral is given).

[0063] The retaining wall component F can be expanded in diameter by increasing the connection length of the two connecting parts 32 by rotating the turnbuckles of the two connecting parts 42, and is configured so that it can be braced against multiple retaining plates P by being expanded in diameter.

[0064] [Seventh embodiment: earth retaining structure for vertical pit] Fig. 9 shows a pit earth retaining structure (no reference numerals) according to a seventh embodiment. In this pit earth retaining structure, when the portion of sewer pipe G to be repaired is located, for example, 30 m below the road surface, prefabricated ring bodies constituting the support for the earth retaining wall components shown in Fig. 5 are installed in multiple stages as the pit H is dug, with the vertical spacing between the prefabricated ring bodies being set to, for example, 300-750 mm depending on the softness of the ground.

[0065] For each depth position, the retaining plate P is inserted into the outer circumferential gaps of the upper and lower prefabricated ring bodies at once after the upper and lower prefabricated ring bodies corresponding to the top and bottom of the retaining plate P are suspended. Then, for each depth position, the upper and lower prefabricated ring bodies are sequentially expanded in diameter in different time steps. As a result, the two expanded upper and lower prefabricated ring bodies, each with a single step difference in diameter, are pressed against the wall of the vertical hole H in horizontal radial directions from the center of the hole.

[0066] The two upper and lower assembled ring bodies with one step difference are sequentially expanded in diameter in different time steps. This means that, with respect to the outer circumferential gap of the assembled ring body at a certain depth, the time when the lower part of the upper retaining plate P is inserted in a state where the upper part of the lower retaining plate P overlaps the inside of it is: The first process is a time-wise process in which the lower retaining plate P is inserted into the second retaining plate P, and the second process is a time-wise process in which the diameter of the assembled ring body is expanded, and the two upper and lower retaining plates P are inserted into the second retaining plate P in relation to the outer peripheral gap of the assembled ring body one step below.

[0067] More specifically, the retaining plate P at each depth position is inserted into the outer periphery gaps of the upper and lower supports at once after the upper and lower supports corresponding to the top and bottom of the retaining plate P are hung. After that, the upper support is expanded and pressed against the wall of the vertical hole H in horizontal radial directions from the center of the hole by the support.

[0068] On the other hand, the lower support is left as it is without being expanded at this point, and after a further support one level lower is installed and suspended from the lower support, a retaining plate P is inserted into the outer gap of the lower support and pushed down further, and then inserted into the outer gap of the support one level lower, and then the lower support is expanded and pushed down.

[0069] All supports installed above and below are suspended from the one above in order, with the one below suspended from the one above at the required intervals via connecting members, and the one installed at the top (first) is suspended from support 70 shown in Figure 4(A) or support 80 shown in Figure 4(B) at the required intervals via connecting members 90.

[0070] In Figure 8, three or four pit posts 92 are provided inside all of the prefabricated ring bodies and spaced equally around the circumference, and the pit posts 92 are connected to all of the prefabricated ring bodies at their intersections with pillar-embracing connectors 93. This ensures a safe and spacious working space necessary for repairing the sewer pipe G. The pit posts 92 may also be connected to each other via beams or jacks to maintain spacing between them.

[0071] For example, a 1m length of sewer pipe G including the repaired area is cut, a new pipe is installed, and after the necessary tests are carried out, the pit pillars 92, shoring and retaining plate P are removed, after which the hole is filled in and repaved to complete the repair work. [Explanation of symbols]

[0072] , A...Earth retaining wall components, G...Buried pipe, 11...Ring component, 12-14...Connection part, H...pit, 1...Assembly type ring body, 16...Blindfold board, 14B-14D…Connection part, 70, 80...support device, 71...Column part, 72...Horizontal beam, 73... Hanging member, P... retaining board, 14A...connection part, 14a, 14b...Long nuts, 14c...Both end screw members, 14c1...spanner engagement portion, 14c2, 14c3...Male thread part, 14B...Connection part, 14b1...Large diameter pipe, 14b2…Small diameter pipe, 14b3...flange, 14b4...long nut, 14b5...flange, 14b6...long nut, 14b4, 14b6...Threaded portion, 14b4, 14b6...long nuts, 14C...Connection part, 14c1...Large diameter pipe, 14c2…Small diameter pipe, 14c3...flange, Bolt 14c4..., 14c5...L-shaped flange, 14c6...Nat, 14D...Connection part, 14d1...Large diameter pipe, 14d2…Small diameter pipe, 14d3, 14d5... flange, 14d4, 14d5... Bolt, 14d6...Turnbuckle, B...Retaining wall components, H2...pit, 1B...Ring component, 17...Earth retaining surface, 18...Connection part, 19...Channel type connection part, 20...Horizontal plate part, 11B...Ring component, 1B...Assembly type ring body, C...Retaining wall components, 11C...Ring components, 12C―14C…Connection part, 1C...Assembly type ring body, D...Earth retaining wall components, H3...pit, 21...Ring component, 22, 23...Connection part, E...Earth retaining wall components, 31...Ring component, 32, 33...Connection part, ...F earth retaining wall components, 41...Ring component, 42...Connection part, 43...Connection part, 43a, 43b...connected elements.

Claims

1. A retaining wall component for retaining earth on a wall surface of a vertical hole excavated to repair a part of a buried pipe under a road so that the wall surface does not collapse, The device has a plurality of ring-forming members each having a required length slightly smaller than the circumferential length of the vertical hole divided into three or more approximately equal lengths, and a plurality of connecting parts that connect the ring-forming members in a ring shape, At least one connecting portion that connects the ring constituent members in a ring shape is configured to be adjustable so that the circumferential length of the connecting portion is increased, At least one other connecting portion that connects the ring constituent members in a ring shape is configured to be connectable and detachable, A plurality of ring components are arranged along the inner periphery of the vertical hole and are connected by a plurality of connecting parts, so that they can be assembled into an assembly-type ring body along the inner periphery of the vertical hole. An earth retaining wall component characterized by:

2. The retaining wall component described in claim 1, characterized in that the assembly ring bodies are stacked one on top of the other on the underside so that they are in close contact with the wall surface of the vertical hole, forming a cylindrical retaining wall body that retains earth by adhering to the wall surface without the need for shoring.

3. The retaining wall component of claim 1, characterized in that the assembled ring body is configured as a support that adheres closely to the wall surface of the vertical hole and to the inside of the required number of retaining plates that are arranged vertically and closely in contact with each other in the circumferential direction, pressing them toward the wall surface of the vertical hole.

4. The retaining wall component of claim 2, characterized in that the ring component is made of one of circular pipe material, square pipe material, channel material, C-channel material, and angle material, or is made of multiple of any one of these materials stacked together vertically, and further has a connecting portion that connects the upper ring component and the lower ring component to each other.

5. The retaining wall component of claim 2, characterized in that the ring component has a retaining surface portion that is in close contact with the wall surface of the vertical hole, a channel-shaped connecting portion at either the upper or lower end of the retaining surface portion with a channel groove facing horizontally inward, and a horizontal plate portion at the other of the upper or lower end of the retaining surface portion that is inserted and engaged into the channel groove, and the ring component member located on the upper side and the ring component member located on the lower side are connected via the channel-shaped connecting portion and the horizontal plate portion.

6. The retaining wall component described in claim 3, characterized in that the ring component member is made of one of the following materials: circular pipe material, square pipe material, channel material, C-channel material, and angle material, or is made up of multiple materials of one type stacked together one above the other.

7. A connecting portion that is adjustable so that its circumferential length increases, a double-ended screw member having a pair of male threaded portions that have a central spanner engaging portion and that are respectively protruding from both sides of the spanner engaging portion and have opposite screw winding directions; The retaining wall component described in claim 1, characterized in that it is composed of a pair of long nuts fixed to the ends of each ring component member on both sides of the double-ended screw members and threaded into one of the male threaded portions.

8. The retaining wall component of claim 1, characterized in that the connecting portion, which can be adjusted to increase its circumferential length, includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and fixed to either end face of the ring component members on both sides, and is provided with a long nut fixed to a flange attached to the large-diameter pipe and a long nut fixed to a flange attached to the small-diameter pipe, and the two threaded portions on both sides have opposite threading directions and include double-ended screw members screwed onto the pair of long nuts.

9. The retaining wall component of claim 1, characterized in that the connecting portion, which can be adjusted to increase its circumferential length, includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and fixed from either end face of the ring component members on both sides, and a bolt passed through a bolt-through hole in a flange attached to the large-diameter pipe is screwed into a nut fixed to the protruding end of an L-shaped flange attached to the small-diameter pipe.

10. The retaining wall component of claim 1, characterized in that the connecting portion, which can be adjusted to increase its circumferential length, includes a composite pipe in which a large-diameter pipe and a small-diameter pipe are slidably fitted together and are provided from the end face of either of the ring component members on both sides, and a turnbuckle that is provided in parallel with the composite pipe and connects the ring component members on both sides.

11. A plurality of prefabricated ring bodies are installed as supports at intervals in the depth direction of the vertical hole, and the prefabricated ring body installed at the shallowest position is supported in a suspended state by a support member which is either an enclosing frame installed on the road surface or a flat plate placed closely around the vertical hole on the road surface (i.e., supported via a hanging member hanging from the support member), and the prefabricated ring bodies installed at depths other than the shallowest position are connected (at least at three locations approximately equally distributed around the circumferential direction) by hanging members that hang so as to maintain the distance from the retaining wall component one level above, The assembly ring body presses the upper part of the retaining plate against the wall surface of the vertical hole, and the assembly ring body one step lower presses the lower part of the retaining plate against the wall surface of the vertical hole, The structure has a plurality of standing posts erected inside the retaining wall components and at equal intervals in the circumferential direction, and the standing posts are connected at the intersections of the ring components of the first and second and subsequent retaining wall components. A vertical pit retaining structure characterized by:

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