Support dismantling method, deformation prevention frame horizontal placement auxiliary tool, and support dismantling device

Abstract

To provide a disassembling method of a support frame, a horizontally placing auxiliary tool, and a disassembling device of the support frame.SOLUTION: A disassembling method of a support frame comprises: a deformation preventing fixation step of attaching, to a first deformation preventing frame disposed outermost on an upstream side and / or a downstream side and a second deformation preventing frame disposed next thereto among ring-shaped deformation preventing frames constituting the support frame, a connection fixation member that connects and fixes the two deformation preventing frames and a horizontally placing auxiliary tool that grips a lower part frame member of the second deformation preventing frame at one end thereof and supports rotatably a lower part of the first deformation preventing frame at the other end thereof; a hanging member installation step of attaching a hanging tool to an upper part of the first deformation preventing frame and hooking a hanging cable to the hanging tool; a wale material removing step of removing wale materials other than a wale material that supports the lower part frame member; a connection fixation member removing step of removing the connection fixation member from the first deformation preventing frame and the second deformation preventing frame; and a horizontal installation step of laying down horizontally the first deformation preventing frame while controlling rotation of the first deformation preventing frame.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a support dismantling method, a deformation prevention frame horizontal placement auxiliary tool, and a support dismantling device that are applied when forming a rehabilitation pipe on an existing pipe. [Background technology]

[0002] A widely used method for rehabilitating existing pipes such as aging sewer pipes involves fabricating a rehabilitating pipe made of synthetic resin such as rigid polyvinyl chloride inside the existing pipe, and then injecting and hardening backfill material into the gap between the existing pipe and the rehabilitating pipe.When injecting the backfill material, supports are sometimes installed at intervals inside the rehabilitating pipe in the axial direction of the pipe to prevent the rehabilitating pipe from buckling due to the load or injection pressure of the backfill material, or to prevent the rehabilitating pipe from shifting from its predetermined position relative to the existing pipe due to buoyancy (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2013-256854 Summary of the Invention [Problem to be solved by the invention]

[0004] When the diameter of a rehabilitated pipe becomes large, it can reach over 2m. When installing a support frame for such a large diameter rehabilitated pipe, the waling material must be removed while the frame is firmly held in place to prevent it from accidentally falling over. In addition, because a single frame can be very large and weigh over 100kg, it is difficult to lay the frame horizontally after it has been erected for transportation, requiring considerable care, effort, and time. Therefore, the present invention provides a support dismantling method and a deformation prevention frame horizontal placement auxiliary tool that facilitates support dismantling and improves work efficiency. [Means for solving the problem]

[0005] The method for dismantling supports of the present invention includes a deformation prevention frame fixing step of attaching a connecting and fixing member that connects and fixes a first deformation prevention frame installed at the outermost upstream and / or downstream side and a second deformation prevention frame installed adjacent to the first deformation prevention frame to the ring-shaped deformation prevention frames that are installed at intervals inside the rehabilitated pipe when the rehabilitated pipe is formed, and a horizontal placement auxiliary device that grips and fixes the lower frame material of the second deformation prevention frame at one end and rotatably supports the lower part of the first deformation prevention frame at the other end; and a step of fixing one end of a hanging rope to the upper part of the first deformation prevention frame. Both methods include a hanging member installation process in which the hanging cord is attached to the upper part of the second deformation prevention frame so that the length between the hanging cord and the upper part of the first deformation prevention frame can be freely extended; a walnut member removal process in which, after the deformation prevention frame fixing process and the hanging member installation process, all walnut members other than those supporting the lower frame member are removed; a connecting and fixing member release process in which, after the walnut member removal process, the connecting and fixing members are removed from the first deformation prevention frame and the second deformation prevention frame; and a horizontal installation process in which, using the hanging cord and horizontal placement auxiliary device, the first deformation prevention frame is laid horizontally while controlling the speed at which the first deformation prevention frame is laid horizontally by operating the hanging cord. According to this configuration, the first deformation prevention frame is fixed to the second deformation prevention frame with the horizontal placement auxiliary device, and the hanging rope is attached directly to the first deformation prevention frame and the second deformation prevention frame to remove the first deformation prevention frame, so that the first deformation prevention frame can be removed in the installed position.

[0006] In the horizontal installation step of the support dismantling method of the present invention, the first deformation prevention frame may be tilted by placing the outermost part of the lower frame material of the first deformation prevention frame against a surface formed in an arc shape. According to this configuration, the sideways tilting movement of the first deformation prevention frame becomes stable and smooth.

[0007] In the waling member removing step of the support dismantling method of the present invention, the waling members may be removed sequentially from above downward. According to this configuration, the support of the deformation prevention frame can be released more stably.

[0008] In the connecting and fixing member releasing step of the support dismantling method of the present invention, the removed connecting and fixing member may be fixed to the second deformation prevention frame and a third deformation prevention frame adjacent to the second deformation prevention frame. This configuration allows the support release work to be carried out efficiently.

[0009] In the horizontal installation process of the support dismantling method of the present invention, a carriage member having a bridge may be installed in the rotational direction of the first deformation prevention frame, and the first deformation prevention frame may be placed horizontally on the carriage member. According to this configuration, the deformation prevention frame can be removed efficiently.

[0010] The horizontal placement aid for deformation prevention frames of the present invention comprises upper and lower wall portions arranged to sandwich from above and below the lowermost frame material of a first deformation prevention frame installed on the outermost upstream and / or downstream side of multiple ring-shaped deformation prevention frames that constitute supports installed at intervals inside a rehabilitation pipe when the rehabilitation pipe is formed, and comprises an arc-shaped curved surface formed on the inner surface of the upper wall portion, a curved clamp that rotatably supports the lower frame material, a fixing portion that grasps and fixes the lowermost frame material of a second deformation prevention frame installed adjacent to the first deformation prevention frame at a distance from the first deformation prevention frame, and a connecting rod portion that connects the curved clamp and the fixing portion, and assists in smooth horizontal placement when the first deformation prevention frame is released from its fixation to the rehabilitation pipe and placed horizontally on the opposite side to the second deformation prevention frame. According to this configuration, the sideways tilting movement of the first deformation prevention frame becomes stable and smooth.

[0011] The length of the connecting rod portion of the deformation prevention frame horizontal placement auxiliary tool of the present invention may be made extendable. With this configuration, the horizontal placement aid can be easily adjusted to accommodate differences in the distance between the deformation prevention frames.

[0012] The support dismantling device of the present invention comprises any one of the horizontal placement auxiliary devices, a connecting and fixing member having fixing portions at both ends of a connecting rod that fix the lower frame material of the first deformation prevention frame and the lower frame material of the second deformation prevention frame, respectively, and a suspension rope that is attached to the upper frame material of the first deformation prevention frame and the upper frame material of the second deformation prevention frame. This configuration allows the support release work to be carried out efficiently. [Effects of the Invention]

[0013] The inventions of the present application have the effect of facilitating the dismantling of supports and improving work efficiency. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a state in which a support according to one embodiment of the present invention is installed inside a rehabilitation pipe. [Figure 2] FIG. 2 is a perspective view showing a part of a connecting and fixing member according to one embodiment of the present invention. [Figure 3] 1A is a side view showing a radiused clamp of a horizontal placement aid according to one embodiment of the present invention, and FIG. 1B is a plan view of the radiused clamp. [Figure 4] 1A is a side view showing a fixing portion of a horizontal placement aid according to an embodiment of the present invention, and FIG. 1B is a plan view of the fixing portion. [Figure 5] 10 is a schematic diagram showing the dismantling process of the support of one embodiment of the present invention. FIG. [Figure 6] 10 is a schematic diagram showing the dismantling process of the support of one embodiment of the present invention. FIG. [Figure 7] 10 is a schematic diagram showing the dismantling process of the support of one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of a support dismantling device and a support dismantling auxiliary tool of the present invention will be described with reference to the drawings.

[0016] As shown in Figure 1, the support 1 has a polygonal (octagonal in this embodiment) deformation prevention frame 2, a plurality of waling members 3 fixed around the circumferential direction of the rehabilitating pipe X, support members 4 that set the distance between the deformation prevention frame 2 and the waling members 3, and uplift prevention columns 5. Although not essential, for reinforcement, the deformation prevention frame 2 to which the rehabilitating pipe X to be attached has a large diameter is equipped with a vertical reinforcing member 6 and a horizontal reinforcing member 7 provided approximately in the center between the top and bottom of the deformation prevention frame 2. In addition to the above-mentioned forms, the present invention also applies to supports 1 that use a deformation prevention frame 2 that is more than square or is circular.

[0017] The deformation prevention frame 2 is a highly rigid member that serves as a base for pressing when the rehabilitating pipe X is shaped by pressing the rehabilitating pipe X with the waling members 3 described later. The deformation prevention frame 2 comprises frame members 8, which are long, rectangular steel pipes arranged approximately along the inner wall of the rehabilitation pipe X with the pipe axis oriented approximately horizontally or approximately vertically, and corner members 9, which connect the ends of the frame members 8.

[0018] For example, the frame material 8 of the deformation prevention frame 2 used for a large diameter rehabilitation pipe X of 2 m or more is often made of square steel pipes with a pipe axis direction (longitudinal) dimension of about 1.5 m, cross-sectional dimensions of about 100 mm x 100 mm, a thickness of 3 to 4 mm, and a weight of 30 kg or more, in order to ensure rigidity capable of withstanding the load of the rehabilitation pipe X. The corner members 9 are configured such that the length in the axial direction of the frame material 8 is appropriately set, and have connecting portions (not shown) at both ends to which the ends of the frame material 8 are fitted and fixed with bolts.

[0019] The shape of the deformation prevention frame 2 is not limited, but in this embodiment, it is assembled into a substantially octagonal shape by frame members 8, corner members 9, vertical reinforcing members 6 and horizontal reinforcing members 7. A plurality of deformation prevention frames 2 having such a configuration are installed at approximately regular intervals in the direction of the axis L of the rehabilitating pipe X (the depth direction of the paper in FIG. 1) between the upstream end and the downstream end of the rehabilitating pipe X. The installation interval of the deformation prevention frames 2 is not particularly limited as long as it is an interval appropriate for shaping and holding the rehabilitating pipe X. Deformation prevention frames 2 used for a large diameter rehabilitating pipe X of 2 m or more may be installed at intervals of, for example, 2 m.

[0020] The waling members 3 are formed using square pipes with a rectangular cross section. The length dimension of the waling members 3 in the pipe axis direction is formed to match the installation interval of the deformation prevention frames 2 in the axis L direction of the rehabilitating pipe X. The wale-raising members 3 are installed on the inner wall surface of the rehabilitating pipe X at intervals in the circumferential direction, with their pipe axis direction directed parallel to the axis L of the rehabilitating pipe X.

[0021] The support member 4 is a roughly rod-shaped member, one end of which is fixed to the deformation prevention frame 2, and the other end of which is fixed to the waling member 3, and which projects and shapes the rehabilitation pipe X between the deformation prevention frame 2 and the waling member 3. In this embodiment, the support member 4 can be formed mainly from a jack bolt and a dish member formed in a U-shape in cross section from a steel plate that grips and fixes the waling member 3 on the other end side of the jack bolt. Specifically, a plurality of support members 4 are arranged at intervals in the axial direction of the tube of each frame member 8. A wale raising member 3 is arranged at the tip of the other end of the support member 4.

[0022] The anti-floating pillar 5 is arranged so that one end of the jack bolt penetrates the rehabilitation pipe X and abuts against the top surface of the existing pipe Y, and the other end penetrates a frame material 8 installed along the top surface of the rehabilitation pipe X.

[0023] In this manner, a plurality of supports 1 are installed between the upstream end and downstream end of the rehabilitating pipe X. Next, an embodiment of a support dismantling device according to the present invention, which is used when dismantling the support 1 installed as described above, will be described.

[0024] As shown in Figures 2 to 4 or 5, the support dismantling device includes a connecting and fixing member 11 (see Figure 2) used to remove the flank support material 3 installed around the deformation prevention frame 2 shown in Figure 1, a horizontal placement aid 12 (see Figures 3 and 4) used when laying the deformation prevention frame 2 down and tilting it sideways, and a hanging rope 25 (see Figure 6) that constitutes the hanging member.

[0025] 5 and 6 are schematic diagrams showing the dismantling process of the supports. The radiused clamp 21 and the fixing part 22 of the horizontal placement support tool 12 shown in FIG. 3 and the fixing part 15 of the connecting member 11 shown in FIG. 4 are shown in simplified form. As shown in Figure 5(a), the connecting and fixing member 11 is a member that fixes the first deformation prevention frame 2A, which is erected on the outermost side of the upstream and / or downstream side of the rehabilitation pipe X, to the second deformation prevention frame 2B erected adjacent to it, thereby stably maintaining the erected state of the first deformation prevention frame 2A. As shown in FIG. 2, the connecting and fixing member 11 has a fixing portion 15 and a connecting rod 16 that are fixed immovably to the first and second deformation prevention frames 2A and 2B, respectively.

[0026] In this embodiment, the fixing portion 15 takes the form of a clamp having three mounting plate portions 17 respectively arranged on the three surfaces of the frame material 8, fastening members 18 (bolts and nuts in this embodiment) for fastening the mounting plate portions 17 to the frame material 8, and a fixing portion 19 for connecting to the connecting rod 16. The three mounting plate portions 17 are rotatably connected to the mounting plate portions 17, 17 that are respectively connected to each other around a rotation axis 17a. The mounting plate portions 17, 17 at both ends of the three mounting plate portions 17 are formed so that a bolt can be inserted between the mounting plate portions 17, 17 when they are arranged parallel to each other and facing each other.

[0027] The connecting rod 16 comprises a highly rigid tubular member that is spanned between the deformation prevention frames 2, 2. Fixing parts 15 are attached to both ends of the connecting rod 16 by fastening with bolts and nuts, etc. The tubular member is not particularly limited as long as it has enough rigidity to hold the deformation prevention frame 2, but in this embodiment it is formed from a single steel pipe.

[0028] As shown in Figures 3 and 4, the horizontal placement aid 12 is a member that has a radiused clamp 21 with an upper wall plate having a radiused portion 20 at one end of a connecting rod 23, and a fixing portion 22 at the other end of the connecting rod portion 23.

[0029] 3, radiused clamp 21 mainly comprises a lower wall plate 21c formed in a rectangular shape when viewed from the bottom, a rear wall plate 21b rising substantially vertically from one edge of lower wall plate 21c, and an upper wall plate 21a extending parallel to lower wall plate 21c after forming a radiused portion 20 from the upper edge of rear wall plate 21b. Radiused clamp 21 further comprises a threaded rod portion 21j protruding substantially vertically from an outer surface 21p of rear wall plate 21b.

[0030] The upper surface of the lower wall panel 21c has a predetermined width dimension (i.e., the dimension in the direction along the pipe axis of the frame material 8) that can stably support the lower part of the frame material 8, and a depth dimension (i.e., the dimension in the direction perpendicular to the width dimension) that is approximately less than twice the depth dimension of the frame material 8 when installed within the rehabilitation pipe X.

[0031] The rear wall plate 21b has a width dimension equivalent to that of the lower wall plate 21c and a height dimension slightly greater than the height dimension of the lower frame material 8 installed horizontally within the rehabilitating pipe X. The inner surface of the curved portion 20 of the upper wall panel 21a extends upward while curving in the arc shape described by the upper corner of the frame material 8 when the frame material 8 is lifted so that the upper corner of the frame material 8 abuts against the upper end of the rear wall panel 21b and the frame material 8 is rotated by approximately 40 to 45 degrees.

[0032] The upper wall plate 21a is formed to have the same width as the lower wall plate 21c and the same depth as the lower wall plate 21c in a plan view. The upper wall plate 21a (i.e., the rear wall plate 21b and the lower wall plate 21c) has a width that allows the lower frame material 8 to be held down without rattle. The upper wall plate 21a and the lower wall plate 21c are formed with bolt insertion holes 21h through which the bolts 21d pass in the vertical direction.

[0033] The bolt insertion holes 21h are provided at positions away from the frame material 8 so that the frame material 8 placed inside the radiused clamp 21 can easily rotate. The bolts 21d are designed to prevent the bolts from jumping out of the radiused clamp 21 when the deformation prevention frame 2 is tilted. The lower wall plate 21c, the rear wall plate 21b, and the upper wall plate 21a are integrally formed from highly rigid steel plates. The upper wall plate 21a and the rear wall plate 21b are set to be thicker than the lower wall plate 21c to increase rigidity.

[0034] 4, the fixing part 22 is a clamp member mainly including a lower wall plate 22c having a rectangular flat surface, a rear wall plate 22b rising substantially perpendicularly from the edge of the lower wall plate 22c, and an upper wall plate 22a extending parallel to and facing the lower wall plate 22c from the upper end of the rear wall plate 22b. The fixing part 22 further includes a threaded rod portion 22j protruding substantially perpendicularly from an outer surface 22p of the rear wall plate 22b. The lower wall plate 22c, the rear wall plate 22b and the upper wall plate 22a of the fixing portion 22 are formed with widths that can hold the frame material 8 without rattle. The height dimension of the rear wall panel 22b is set to be slightly greater than the frame material 8 so that the fixing portion 22 can be smoothly fitted to the frame material 8 and the frame material 8 can be held without any rattle in the vertical direction.

[0035] The upper wall plate 22a and the lower wall plate 22c of the fixing portion 22 are formed with insertion holes 22h for fasteners (bolts and nuts in this embodiment) 22d that tighten the clamp portion so that the clamp does not move relative to the frame material 8 when the frame material 8 is approximately fitted to the inner wall surfaces of the lower wall plate 22c, the rear wall plate 22b and the upper wall plate 22a.

[0036] The connecting rod 23 includes a steel pipe member 24a and a handle nut 24b. The pipe member 24a has handle nuts 24b on both ends, and the length of the entire horizontal placement aid 21 can be adjusted and fixed by tightening the handle nuts 24b after the radiused clamp 21 and the threaded rod portions 21j, 22j of the fixing portion 22 are inserted to a predetermined length at both ends.

[0037] As shown in Figure 6(a), the suspension cord 25 is not particularly limited as long as it is durable enough to suspend the deformation prevention frame 2, and a highly durable string-like member such as a wire rope can be used.

[0038] The support 1 is detached and removed from the rehabilitation pipe X as follows using the support dismantling device equipped with the above-mentioned connecting and fixing member 11, horizontal placement auxiliary device 12, and hanging rope 25.

[0039] <Deformation prevention frame fixing process> As shown in Figure 5(a), when removing the supports, first, a connecting and fixing member 11 and a horizontal placement auxiliary device 12 are attached to the first deformation prevention frame 2A installed on the outermost side of the rehabilitation pipe X, i.e., the most upstream or downstream side, and the second deformation prevention frame 2B installed next to it.

[0040] The connecting and fixing members 11 are preferably fixed mainly to the lower side of the deformation prevention frame 2 in at least three or more locations, and are preferably fixed symmetrically at four locations. Fixing the connecting and fixing members 11 to the deformation prevention frame in three or more locations improves stability, and fixing them approximately symmetrically at four or more locations increases stability even more, making it possible to minimize wobbling even in deformation prevention frames installed on a rehabilitation pipe X that is 2 m or longer. However, there are no particular restrictions on the location where the connecting and fixing members 11 are fixed, as long as they can firmly fix the first deformation prevention frame 2A to be removed to the second deformation prevention frame 2B, which is firmly supported upright.

[0041] 1, for example, the fixing portions 15 of the connecting and fixing members 11 are fixed to the outside of the intersections of the vertical reinforcing members 6 and horizontal reinforcing members 7 of the first deformation prevention frame 2A and the second deformation prevention frame 2B, and to the lower sides of the frame members 8 that extend in a substantially vertical direction on both the left and right sides of the deformation prevention frame 2. The connecting and fixing members 11 are fixed at positions where the first deformation prevention frame 2A and the second deformation prevention frame 2B face each other, so that the connecting rods 16 of the connecting and fixing members 11 extend in a direction perpendicular to the vertical reinforcing members 6 and horizontal reinforcing members 7.

[0042] The horizontal placement auxiliary devices 12 are installed at two locations spaced apart on the lower frame material 8 of the deformation prevention frame 2, which is installed approximately horizontally at the bottom of the rehabilitation pipe X, more specifically, just inside the vertical reinforcing member 6. The fixing part 22 of the horizontal placement auxiliary tool 12 is firmly fixed to the lower frame material 8 of the second deformation prevention frame 2B. Specifically, with the bolts removed, the fixing part 22 is pushed in until the rear wall panel 22b firmly contacts the lower frame material 8 of the second deformation prevention frame 2B, and the bolts are inserted into the bolt insertion holes 22h and tightened with nuts to fix the bolts.

[0043] The radiused clamp 21 of the horizontal placement auxiliary tool 12 is installed so as to hold the lowest frame material 8 of the first deformation prevention frame 2A. Specifically, the clamp is pushed in until the rear wall panel 22b of the radiused clamp 21 firmly contacts the lowest frame material 8 of the first deformation prevention frame 2A, and then a bolt is passed through the bolt insertion hole 21h and fastened with a nut.

[0044] <Hanging member installation process> As shown in Figure 5(b), the slings 25 are attached to the upper frame member 8, which is installed horizontally at the top of the first deformation prevention frame 2A and the second deformation prevention frame 2B. The attachment position is preferably the center in the longitudinal direction of the upper frame member 8. By attaching the slings 25 to the center of the upper frame member 8, the deformation prevention frame can be tilted in the rotation direction around the lower frame member 8 as the central axis without any bias to the left or right. One end of the suspending cable 25 is attached and fixed to the upper frame material 8 of the first deformation prevention frame 2A. Then, the suspending cable 25 is wound once around the upper frame material 8 of the second deformation prevention frame 2B, and the other end of the suspending cable 25 is stretched downward so that it can be grasped by an operator. It does not matter which of the deformation prevention frame fixing step and the hanging member installation step is performed first.

[0045] <Wall-raising material removal process> When the deformation prevention frame fixing process and the hanging member installation process are completed, the first deformation prevention frame 2A is fixed by the second deformation prevention frame 2B to prevent it from wobbling. Then, the tension of the uplift prevention columns 5 and the support members 4 of the waling members 3, which are tensioned between the rehabilitation pipe X and the first deformation prevention frame 2A, is loosened, and the waling members 3 are sequentially removed from top to bottom. At this time, it is advisable to temporarily fix the upper frame members 8, 8 of the first deformation prevention frame 2A and the second deformation prevention frame 2B together using a lever block (registered trademark) or the like. The lower frame member 8 and the support members 4 between the corner members 9 at both ends of the lower frame member 8 and the rehabilitation pipe X are maintained in tension, and the arrangement of the waling members 3 is maintained as is.

[0046] <Connection and fixing member release process> After the removal process of the wale-raising material 3 is completed, the suspension rope 25 is tensioned between the first deformation prevention frame 2A and the second deformation prevention frame 2B as shown in Fig. 6(a). Then, all of the connecting and fixing members 11 that connect and fix the first deformation prevention frame 2A and the second deformation prevention frame 2B are removed. As a result, the first deformation prevention frame 2A is held only by the radiused clamps 21, the lower support members 4, the wale support members 3 and the hanging ropes 25. The removed connecting and fixing member 11 may be used to connect the second deformation prevention frame 2B to the next installed deformation prevention frame 2 (third deformation prevention frame).

[0047] <Horizontal installation process> 7, the support members 4 supporting the lower frame member 8 of the first deformation prevention frame 2A and the support members 4 for the corner members 9 at both ends of the support members 4 are used to slightly lift the first deformation prevention frame 2A upward relative to the radiused clamps 21. When the upper corners on the rear side of the lower frame member 8 come into contact with the upper ends of the rear wall panel 21b of the radiused clamps 21, the worker stretches and gradually feeds out the suspending ropes 25, and slowly tilts the first deformation prevention frame 2A in the opposite direction to the second deformation prevention frame 2B, as shown in FIG.

[0048] During this rotation, the lower frame member 8 of the first deformation prevention frame 2A does not rotate around the lower corner on the opening side as a central axis. Instead, as shown in FIG. 7, when the frame member 8 is raised, the lower corner on the rear wall panel 21b side rotates along the rear wall panel 21b, and the upper corner on the rear wall panel 21b side rotates along the inner wall surface of the rounded portion 20, while rubbing against each other. During this operation, if the clamp holding the lower frame member 8 of the first deformation prevention frame 2A does not have the rounded portion 20 and therefore does not have an inner surface along which the upper rear corner can be aligned, the first deformation prevention frame 2A will tilt with almost no support. This makes the first deformation prevention frame 2A more likely to swing within the clamp, making its movement awkward. As a result, the first deformation prevention frame 2A may accidentally tip over, causing the pivot axis to become unstable, potentially causing the first deformation prevention frame 2A to come into contact with and damage the rehabilitating pipe X when tilted.

[0049] However, with the horizontal placement auxiliary tool 12 of this embodiment, when the first deformation prevention frame 2A is rotated, the rear lower corners of the frame material 8 are aligned with the rear wall panel 21b, and the rear upper corners are abutted against the inner arc-shaped surface of the rounded portion 20 of the radiused clamp 21. This allows the first deformation prevention frame 2A to be rotated stably and without significant deviation of the axis around the pipe axis of the lower frame material 8. In other words, the deformation prevention frame 2 can be laid sideways while supporting the lower and upper frame members 8, respectively. As a result, the first deformation prevention frame 2A can be laid sideways correctly and stably in the desired direction, and the first deformation prevention frame 2A can be laid sideways efficiently without damaging the rehabilitating pipe X.

[0050] When laying the first deformation prevention frame 2A down, as shown in Figure 6(b), a cart 30 is placed in a position where the first deformation prevention frame 2A will be placed horizontally, and after the first deformation prevention frame 2A is placed horizontally, it can be transported and removed as is. After removing the first deformation prevention frame 2A, the second deformation prevention frame 2B and the third deformation prevention frame 2C are used as the new first deformation prevention frame 2A and second deformation prevention frame 2B, and the above procedure is repeated to remove the deformation prevention frame 2 and remove the support 1.

[0051] In this way, the support dismantling auxiliary tool and the horizontal placement auxiliary tool 12 for the deformation prevention frame 2 of this embodiment make it possible to stably and efficiently remove and transport the first deformation prevention frame 2A.

[0052] Furthermore, according to the support dismantling method of the present invention, the method of suspending the deformation prevention frame 2 from the ceiling surface outside the rehabilitation pipe X using a ceiling anchor hoist or the like is not adopted, and the work is performed by attaching the suspending ropes 25 directly to the upper frame material 8 of the deformation prevention frame 2. Therefore, the work of temporarily fixing multiple deformation prevention frames 2 with the connecting and fixing members 11, carrying them out of the rehabilitation pipe X, and suspending them from the ceiling anchor hoist is omitted, and the supports can be dismantled and transported one by one within the rehabilitation pipe X. Therefore, the support dismantling method of the present invention has the effect of reducing the number of work steps and allowing the work to be carried out efficiently.

[0053] Furthermore, in the waling member removal step, after the connecting and fixing members 11 are fixed, the waling members 3 are removed one by one, starting from the upper one, so that the work can be carried out stably. Furthermore, in the connecting and fixing member releasing step, the removed connecting and fixing member 11 is fixed to the deformation prevention frames 2, 2 on which the next work will be performed, so that the work can be performed efficiently and stably.

[0054] It should be noted that not only the horizontal placement aid 12 but also the connecting rod 16 of the connecting and fixing member 11 may be configured to be extendable. With this configuration, the lengths between the clamps and fixing parts of the horizontal placement aid 12 and the connecting and fixing member 11 can be suitably adjusted to the distance between the deformation prevention frames 2, 2. [Explanation of symbols]

[0055] 1. Support 2. Deformation prevention frame 2A First deformation prevention frame 2B Second deformation prevention frame 3 Waxing material 4 Support member 5. Anti-floating pillar 11 Connecting and fixing member 12 Horizontal placement aid 15 Fixed part 16 Connecting rod 20 R Section 21 Radius clamp 22 Fixed part 23 Connecting rod part 25 Lifting rope 30 Connected Bogie X rehabilitation pipe Y Existing pipe

Claims

1. a deformation prevention frame fixing process in which a connecting and fixing member is provided to connect and fix a first deformation prevention frame installed at the outermost upstream and / or downstream side and a second deformation prevention frame installed adjacent to the first deformation prevention frame, among a plurality of ring-shaped deformation prevention frames installed at intervals inside the rehabilitation pipe when the rehabilitation pipe is formed, to the first deformation prevention frame and the second deformation prevention frame, and a radiused clamp having a fixing portion at one end of a connecting rod portion and an upper wall plate with a radiused portion at the other end, which grips and fixes the lower frame material of the second deformation prevention frame at the fixing portion, and the radiused clamp is used to attach a horizontal placement auxiliary device that rotatably supports the lower part of the first deformation prevention frame; a hanging member installation process of fixing one end of a hanging rope to an upper portion of the first deformation prevention frame and attaching the hanging rope to an upper portion of the second deformation prevention frame so that the length between the hanging rope and the upper portion of the first deformation prevention frame can be freely extended; After the deformation prevention frame fixing process and the hanging member installing process, a walnut member removing process is performed to remove walnut members other than the walnut members supporting the lower frame material. a connecting and fixing member releasing step of removing the connecting and fixing member from the first deformation prevention frame and the second deformation prevention frame after the wale-raising member removing step; a horizontal installation process in which the first deformation prevention frame is tilted horizontally using the hanging rope and horizontal placement auxiliary device while controlling the speed at which the first deformation prevention frame is tilted sideways by operating the hanging rope.

2. A method for dismantling supports as described in claim 1, wherein in the horizontal installation process, the outermost part of the lower frame material of the first deformation prevention frame is brought into contact with the inner surface of the upper wall panel, which is formed in an arc shape, to thereby cause the first deformation prevention frame to fall down.

3. 3. The support dismantling method according to claim 1, wherein the waling members are successively removed from above downward in the waling member removing step.

4. A method for dismantling supports as described in claim 1 or 2, wherein in the connecting and fixing member releasing process, the removed connecting and fixing members are fixed to the second deformation prevention frame and a third deformation prevention frame adjacent to the second deformation prevention frame.

5. A method for dismantling supports as described in claim 1 or 2, wherein in the horizontal installation process, a carriage member having a piece is installed in the rotational direction of the first deformation prevention frame, and the first deformation prevention frame is placed horizontally on the carriage member.

6. a clamp having upper and lower wall portions arranged to sandwich from above and below a lower frame material of a first deformation prevention frame installed at the outermost upstream and / or downstream side among a plurality of ring-shaped deformation prevention frames that constitute supports installed at intervals inside the rehabilitating pipe when the rehabilitating pipe is formed, the first deformation prevention frame being installed at the outermost upstream and / or downstream side, the upper wall portion having an arc-shaped curved surface formed on the inner surface thereof, and a radiused clamp that rotatably supports the lower frame material; a fixing portion that grips and fixes a lower frame material of a second deformation prevention frame that is installed adjacent to the first deformation prevention frame with a gap therebetween; a connecting rod portion that connects the radiused clamp and the fixing portion, A deformation prevention frame horizontal placement aid that assists in smooth horizontal placement when the first deformation prevention frame is released from the rehabilitation pipe and placed horizontally on the opposite side to the second deformation prevention frame.

7. The horizontal placement aid according to claim 6, wherein the length of the connecting rod portion is extendable.

8. The horizontal placement aid according to claim 6 or 7, a connecting and fixing member that includes fixing portions at both ends of a connecting rod that are fixed to the lower frame material of the first deformation prevention frame and the lower frame material of the second deformation prevention frame, respectively, and that fixes the first deformation prevention frame to the second deformation prevention frame that is erected adjacent to it, thereby stably maintaining the erected state of the first deformation prevention frame; A support dismantling device comprising a suspension rope attached to the upper frame material of the first deformation prevention frame and the upper frame material of the second deformation prevention frame.

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