Pitch indicator for use in installing timbering and its installation method

Abstract

To provide a pitch indicator and a timbering installation method capable of installing a deformation prevention frame with high work efficiency even when installing timbering while allowing service water to flow inside a rehabilitation pipe.SOLUTION: A pitch indicator 10 is used when installing timbering which includes a plurality of rod-shaped waling materials 3 used to prevent deformation of a rehabilitated pipe X when filling a backfill material between an existing pipe and the rehabilitated pipe X, a deformation prevention frame, and a bolt having a dish member 4a. The pitch indicator 10 includes a gripping part 13 arranged on the waling materials 3 adjacent to the dish member 4a, and an indicator 12 attached to the gripping part 13.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pitch indicator used for installing supports used when filling a gap between an existing pipe and a rehabilitating pipe with backfill material, and a method for installing the same. [Background technology]

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

[0003] The installation of supports is sometimes carried out while service water is flowing inside the rehabilitated pipe. The depth of the service water can be from a few centimeters to about 60 cm. Under such circumstances, the installation of supports involves placing wale-raising materials on the inner wall surface of the rehabilitated pipe, carrying the constituent members of a polygonal frame (referred to in this specification as a "deformation prevention frame") roughly conforming to the shape of the inner wall of the rehabilitated pipe into the rehabilitated pipe, and assembling and fixing the deformation prevention frame on the wale-raising materials, or fixing the assembled frame.

[0004] Specifically, a plurality of rod-shaped steel wale-raising members having a predetermined length are arranged at intervals in the width direction of the inner bottom surface of the rehabilitated pipe, and are connected so as to extend in the axial direction of the rehabilitated pipe. Fixing devices (disk member pressing jack bolts for pressing the wale-raising members) and deformation prevention frames are attached to both ends of the installed wale-raising members to adjust the distance between the wale-raising members and the deformation prevention frames.

[0005] When attaching the jack bolt for pressing the plate member and the deformation prevention frame, the plate member is fitted across the ends of the wale-raising members connected in the axial direction of the pipe, and the bottom frame of the deformation prevention frame is positioned directly above the plate member. Then, the jack bolt is screwed into the female-threaded insertion hole of the deformation prevention frame, and its tip is pressed against the plate member, and the gap between the wale-raising members and the deformation prevention frame is adjusted to a specified value. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-256854 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when service water is flowing through the rehabilitated pipe, the water is murky and the bottom is difficult to see, so it can be difficult to visually determine the position of the dish member on the wale-raising material placed on the inner bottom surface. Especially when the service water level is high (up to about 60 cm), it takes time and effort to identify the position of the dish member, which reduces work efficiency. Therefore, the present invention provides a pitch indicator and a support installation method that allows the deformation prevention frame to be installed efficiently even when installing supports while service water is flowing inside the rehabilitation pipe. [Means for solving the problem]

[0008] The pitch indicator of the present invention is used when installing a support that includes a plurality of rod-shaped walnut members used to prevent deformation of the rehabilitated pipe when filling backfill material between an existing pipe and a rehabilitated pipe, a deformation prevention frame, and a bolt with a dish member, and is provided with a gripping portion that is placed on the walnut members to indicate the installation position of the dish member. The present invention can easily indicate the position of the dish member by being placed adjacent to the intended installation position of the dish member.

[0009] The pitch indicator of the present invention may be provided with an indicator that can be detachably attached to the grip portion. According to this configuration, the indicator makes it easier to understand the intended installation position of the dish member, particularly when the gripping portion is disposed on the wale raising material on the inner bottom surface of the rehabilitating pipe.

[0010] The pitch indicator of the present invention may have at least two gripping portions so that they can be placed on a plurality of wale-raising materials arranged parallel to each other and spaced circumferentially from one another on the inner wall surface of the rehabilitation pipe, and the gripping portions may be connected to each other by connecting portions. According to this configuration, the gripping portions can be installed collectively on a plurality of the wale-raising members. Also, according to this configuration, the circumferential interval between the wale-raising members can be maintained.

[0011] At least a part of the connecting portion of the pitch indicator of the present invention is a step portion between the connecting portion and the upper surface of the gripping portion, or a step portion is provided on the connecting portion or on the gripping portion, and the step portion may constitute a stopper against which the deformation prevention frame or a cart transporting this deformation prevention frame can be brought into contact. According to this configuration, by having the deformation prevention frame or a cart that transports the deformation prevention frame touch the step portion, the installation position of the deformation prevention frame becomes easier to understand.

[0012] The connecting portion of the pitch indicator of the present invention is formed with a locking portion to which the indicator can be attached, The engaging portion may be a female screw hole into which the end of the indicator is screwed and held, and the indicator may be rod-shaped overall and have a male screw portion formed at its end for screwing into the female screw portion. According to this configuration, the indicator can be easily and stably fixed to the grip portion.

[0013] The connecting portion of the pitch indicator of the present invention may be deformable to fit the shape of the inner wall surface of the rehabilitation pipe. According to this configuration, the fitting member can be appropriately installed in accordance with the orientation of the wale-raising material arranged on the inner wall surface of the rehabilitation pipe.

[0014] The pitch indicator of the present invention may have two or more dish members which are arranged at each end of a plurality of wale-raising materials arranged parallel to each other at intervals in the circumferential direction of the inner wall surface of the rehabilitation pipe, which are connected to each other in the circumferential direction, and which constitute a dish member pitch retainer which fixes the positional relationship between adjacent wale-raising materials in the circumferential direction. According to this configuration, the distance between adjacent circumferentially adjacent wale-raising members can be fixed by the connected dish members.

[0015] The method for installing supports of the present invention comprises the steps of: The method includes a wale-raising material installation step of arranging a wale-raising material in the axial direction of the rehabilitated pipe, a pitch indicator installation step of arranging any one of the pitch indicators described above at the end of the wale-raising material at the position where a dish member for holding the wale-raising material is arranged or adjacent to the position where the dish member is arranged, a deformation prevention frame moving step of bringing a deformation prevention frame close to the indicator and then arranging at least a part of the deformation prevention frame above the dish member, and a deformation prevention frame installation step of fixing the wale-raising material and the deformation prevention frame with a fixing device. This configuration makes it easy to install the deformation prevention frame. Effect of the Invention

[0016] The present invention has the effect of enabling the deformation prevention frame to be installed with high work efficiency even when installing supports while service water is flowing inside the rehabilitation pipe. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing a support to which a pitch indicator according to an embodiment of the present invention is applied, as viewed in the pipe axis direction. FIG. [Diagram 2] 1 is a perspective view illustrating a dish member pitch holder constituting a pitch indicator according to one embodiment of the present invention; FIG. [Diagram 3] FIG. 1 is a perspective view showing a pitch indicator according to an embodiment of the present invention. [Figure 4]This is a schematic diagram showing the wale-raising material installation process in the pipe axial direction in a method of installing supports using a pitch indicator in one embodiment of the present invention. [Diagram 5] (a) is a schematic plan view of a rib installation step in a method for installing supports using a pitch indicator according to one embodiment of the present invention. (b) is a schematic plan view of a pitch indicator installation step in a method for installing supports using a pitch indicator according to one embodiment of the present invention. (c) is a schematic plan view of a plate member installation step and a deformation prevention frame moving step in a method for installing supports using a pitch indicator according to one embodiment of the present invention. [Figure 6] FIG. 1 is a schematic plan view of a conventional method for installing supports. [Figure 7] 1 is a schematic diagram showing a deformation prevention frame moving process and a deformation prevention frame installation process in the pipe axial direction in a method for installing supports using a pitch indicator according to one embodiment of the present invention. FIG. [Figure 8] This is an overview diagram showing in plan view the repetitive task of installing a pitch indicator on a newly installed wale member in a method of installing supports using a pitch indicator in one embodiment of the present invention. [Figure 9] 1 is a schematic diagram showing the completed installation of a deformation prevention frame in the pipe axial direction by a method of installing supports using a pitch indicator according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions and can be changed as appropriate. First, a support to which the pitch indicator of the present invention is applied will be described. As shown in FIG. 1, the support 1 mainly comprises a polygonal deformation prevention frame 2, a wale support member 3, and a fixing device (a plate member 4a and a jack bolt 4b) 5.

[0019] The deformation prevention frame 2 is a member formed by assembling frame materials such as square steel materials into a frame shape. In this embodiment, the deformation prevention frame 2 is formed in an octagonal shape. This allows the deformation prevention frame 2 to hold down the four sides of the inner wall of the rehabilitating pipe X, i.e., the top surface X1, the inner bottom surface X2, the left and right side surfaces X3, X3, and the corner portions X4, which are easily deformed due to the weight of the backfill material filled between the rehabilitating pipe X and the existing pipe (a pipe that exists with a gap outside the rehabilitating pipe X; not shown; the same applies below).

[0020] The wale-raising material 3 is formed into a rod shape using a steel square material or the like having a predetermined length. The wale-raising members 3 are arranged in parallel at intervals in the width W direction (i.e., the circumferential direction of the rehabilitating pipe X) of each of the top surface X1, the inner bottom surface X2, and the left and right side surfaces X3, and are also arranged so that the wale-raising members 3 extend continuously in the pipe axis L direction of the rehabilitating pipe X. In this embodiment, since the corner portion X4 is narrow in width, only one wale-raising member 3 is arranged so as to be continuously connected in the pipe axis L direction.

[0021] The multiple wale-raising materials 3, which are arranged parallel to each other with intervals in the width W direction, are arranged so that both ends of each are approximately aligned in the pipe axis L direction (although some misalignment may occur), as shown in Fig. 5(a). This makes it possible to collectively press the ends of each of the wale-raising materials 3 arranged in the same region in the pipe axis L direction when the deformation prevention frame 2 is arranged inside the rehabilitating pipe X.

[0022] The longitudinal dimension of the wale-raising material 3 is not particularly limited, but is set to about 1500 mm to 3000 mm, preferably about 2000 mm. The wale-raising materials 3 are formed with the same length dimension, and are arranged with almost no gaps in the longitudinal direction so that they are continuously arranged in the pipe axis L direction of the rehabilitation pipe X. The height dimension of the wale-raising material 3 is not particularly limited, but is formed to be, for example, about 100 mm in height and about 50 mm in width.

[0023] 1 is used by being tensioned between the wale-raising member 3 and the deformation prevention frame 2. As the fixing device 5, a dish member 4a and a jack bolt 4b are preferably used. The tip side of the jack bolt 4b is adapted to press against a disk member 4a which holds and presses the end of the wale-raising material 3.

[0024] As shown in Fig. 2, the plate member 4a is formed in a shallow U-shape from a thin steel plate or the like so as to cover the protruding top surface 3a (i.e., the surface facing the inside of the rehabilitated pipe X when the wale-raising material 3 is placed in the rehabilitated pipe X) and both side surfaces of the wale-raising material 3 shown in Fig. 1 and to grip the wale-raising material 3. The plate member 4a may firmly cover the side surfaces of the wale-raising material 3, but it does not have to be in complete contact.

[0025] The longitudinal direction of the plate member 4a (i.e., the dimension along the extension direction of the wale-raising material 3; the same applies below) is set to an extent that both ends of the wale-raising material 3 can be firmly held down and the contact surface of the wale-raising material 3 with the rehabilitating pipe X can press the inner wall surface of the rehabilitating pipe X. The specific longitudinal dimension of the plate member 4a is not limited, but can be about 200 mm to 400 mm.

[0026] A pressing part 7 having a hole against which the jack bolt 4b is pressed protrudes from approximately the center in the longitudinal and lateral directions of the upper plate part 6 of the dish member 4a that covers the protruding top surface 3a of the wale-raising member 3. The inside of the pressing part 7 is a hole with a bottom.

[0027] In this embodiment, the dish members 4a arranged on each of the inner wall surfaces X1 to X3 of the rehabilitation pipe X shown in Figure 1 are connected by connecting members 8 so that they can be arranged collectively across multiple flank members 3, 3, 3 arranged at intervals in the width W direction (hereinafter, the entire dish members 4a connected by the connecting members 8 will be referred to as the ``dish member pitch retainer 4''). The connecting member 8 is formed from a long, thin steel plate, extends across and between the multiple dish members 4a arranged parallel to one another with spaces between them, and is welded to the upper plate portions 6 of the dish members 4a.

[0028] The welding position of the connecting member 8 on the upper plate portion 6 is not limited, but is preferably the central portion of the upper plate portion 6 in the longitudinal direction. The dish members 4a of the dish member pitch holder 4 having the above-mentioned configuration have their U-shaped openings facing in the same direction, are spaced apart in a direction perpendicular to the longitudinal direction of the U-shape, and both end faces in the handle longitudinal direction that appear in the U-shape are aligned and connected on the same plane between the dish members 4a.

[0029] The dish member 4a of this dish member pitch holder 4 is also used as part of the pitch indicator 10 as a member for fixing the spacing between multiple adjacent wale-raising members 3 in the width W direction shown in Figures 5(a)-(c).

[0030] Next, the pitch indicator 10 of the present invention used when setting up the above supports will be described. As shown in FIG. 3, the pitch indicator 10 includes a fitting member 11 to be attached to the wale-raising member 3, and an indicator 12 (the upper portion of the indicator 12 is omitted in the drawing). The fitting member 11 includes a gripping portion 13 and a connecting portion 14 .

[0031] The gripping portion 13 is formed in a manner similar to that of the plate member 4a. Specifically, the gripping portion 13 is formed of a steel plate bent in a substantially U-shape so as to cover both side surfaces and the protruding top surface 3a of the wale-raising material 3 and to grip the wale-raising material 3. The gripping portion 13 extends a certain distance in the longitudinal direction (i.e., the dimension along the extension direction of the wale-raising material 3; the same applies below) so as to firmly grip the wale-raising material 3 and not easily come off. The specific longitudinal dimension of the gripping portion 13 is not limited, but can be about 200 mm to 400 mm.

[0032] The connecting part 14 is formed of a steel plate or flat rectangular steel material having a thickness that allows a step part h to be formed between the upper surface of the grip part 13. An insertion wall part (locking part) 15 into which the indicator 12 is inserted and fixed protrudes from the upper wall part 14a of the connecting part 14. The insertion wall part 15 is provided at approximately the center of the upper and lower overlapping areas of the connecting part 14 and the lower grip part 13. The shape of the inside of the insertion wall part 15 is not particularly limited as long as it can insert and firmly hold a rod-shaped indicator 12 or the like. Examples of the shape of the insertion wall part 15 include a shape that allows the end of the indicator 12 to be screwed into a circumferential surface formed with a polygonal or female screw part that matches the shape of the tip of the indicator 12 to be inserted therein.

[0033] The gripping portions 13 are arranged in parallel with a gap between them in the same position (i.e., facing the same), and are connected by the connecting portions 14. That is, the gripping portions 13 are connected by the connecting portions 14 with their U-shaped openings facing the same direction, spaced apart in a direction perpendicular to the longitudinal direction of the U, and both end faces in the grip longitudinal direction that appear in the U-shape aligned on the same plane between the gripping portions 13, and arranged in parallel with each other.

[0034] In this embodiment, the gripping portions 13 are connected by connecting portions 14 in the same number as the number of the wale-raising members 3 that are arranged in parallel to each other at intervals across the width W of the inner wall surface of the rehabilitating pipe X. In addition, the multiple gripping portions 13 are connected to each other at intervals that are the same as the intervals between the multiple wale-raising members 3 that are arranged at equal intervals in this embodiment.

[0035] The connecting portion 14 is welded to the gripping portion 13 at three points: both ends and the center in the longitudinal direction. The upper part of the connecting part 14 in the height direction projects from the gripping part 13 by 1 to several cm to form a step part h.

[0036] The indicator 12 is formed so as to fit the internal shape of the insertion wall portion 15. In this embodiment, the indicator 12 is formed of a rod member having a circular cross section and having a male screw portion formed by cutting a screw on the peripheral surface of one end portion. The indicator 12 may have any length so long as it can protrude above the surface of the water in service. The length of the indicator 12 may be, for example, about 1000 mm to 1500 mm. In addition, it is preferable that the indicator 12 is formed with a relatively small diameter so as to avoid the water pressure of the available water as much as possible.

[0037] On the other hand, the inner diameter of the insertion wall 15 of the connecting portion 14 is preferably formed to be the same as the inner diameter of the insertion wall 15 of the disk member 4a, and the male screw portion of the indicator 12 is preferably formed to be able to screw in with the male screw portion of the jack bolt 4b with the same diameter. This allows the fitting member 11 to be shared with the disk member pitch retainer 4.

[0038] When the plate member 4a and the engaging member 11 are installed on the rib member 3 as described below, the dimension in the tube axis L direction between the pressing portion 7 and the insertion wall portion 15 is set so that when the deformation prevention frame 2 or a cart described below is brought close to a predetermined position relative to the display device 12 or the cart is brought into contact with the step portion h, the insertion hole 2h of the deformation prevention frame 2 shown in Figure 5 (c) is aligned in the vertical direction with the pressing portion 7.

[0039] The installation of the support 1 can be efficiently performed using the pitch indicator 10 of the present invention as follows. <Wall-raising material installation process> As shown in Figs. 4 and 5(a), first, a predetermined number (three in this embodiment) of wale-raising members 3-(1) are arranged in the width W direction of the inner bottom surface X2 of the rehabilitating pipe X.

[0040] <Pitch indicator installation process> Conventionally, in the space 3e between the ends of the wale-raising members 3, 3 butted together in the tube axis L direction, a plate member 4a has been arranged so as to straddle this space 3e, as shown in Fig. 6, for example. Here, the ends of the wale-raising member 3-(1) are almost aligned between the multiple wale-raising members 3 arranged at intervals in the width W direction, as shown in Fig. 5(a), but they are not completely on a straight line extending in the width W direction, and may be slightly misaligned (by about a few centimeters). In such a situation, the plate member 4a needs to cover the space 3e between the ends of the wale-raising members 3, 3 (i.e., the connected portion) so as to be positioned as close as possible to the center of the plate member 4a in the longitudinal direction so as to be able to firmly press the ends, and the pressing portion 7 needs to be arranged so as to be aligned in a substantially straight line in the width W direction.

[0041] However, when working with service water flowing through the rehabilitating pipe X, it was difficult to ensure that all of the ends 3e of the wale-raising members 3 arranged in the width W direction were covered reliably and that the pressing parts 7 of the plate members 4a were aligned in a straight line due to the murky service water, as shown in Figure 6. Therefore, it took a lot of time to arrange the plate members 4a.

[0042] In contrast, in the method of installing supports using the pitch indicator 10 of the present invention, supports are installed reliably and efficiently as follows. In this specification, the deformation prevention frame 2 will be described as being installed from the back to the front in the direction of delivery (from right to left in Figs. 5(a)-(c)). Therefore, Fig. 5 shows the installation of supports using the pitch indicator 10 under the assumption that it will proceed sequentially from left to right. Also, in Figs. 5(a)-(c) and 8, the deformation prevention frame 2 has already been installed at the left end of the wale-raising material 3-(1), but this is not shown in the figures.

[0043] Before connecting the next wale-raising member 3-(2) to the already placed wale-raising member 3-(1) in the pipe axis L direction in Fig. 5(b), the gripping portion 13 of the fitting member 11-(1) is placed on the wale-raising member 3-(1) with a dimension d1, which is about half the longitudinal dimension of the plate member 4a shown in Fig. 5(c), from the tip of one of the multiple wale-raising members 3-(1). At this time, the dimension d1 (for example, about 150 mm to 200 mm) does not need to be exact (a difference of about several tens of mm is allowed), so it can be easily measured from the tip of the wale-raising member 3 with the palm of the hand, etc.

[0044] After the fitting member 11-(1) is placed as described above, the gripping portion 13 with its end faces aligned is placed between the wale-raising members 3 arranged in the width W direction, like a large ruler being laid out. The indicator 12 made of a rod member is attached to the insertion wall portion 15 of the fitting member 11-(1). In this state, the next wale-raising member 3-(2) is connected to the front side of the rehabilitated pipe X. This makes it possible to see at a glance that the end portion 3e (connecting portion) between the wale-raising member 3-(1) and the wale-raising member 3-(2) is located just in front of the pitch indicator 10 (to the right in FIG. 5(c)), above the water surface of the service water.

[0045] Therefore, as shown in Figure 5 (c), the dish member 4a of the dish member pitch retainer 4-(2) is fitted forward in the insertion direction relative to the fitting member 11-(1) so as to span the area 3e between the ends 3e of the flank members 3, 3, and is brought into close contact with the fitting member 11.

[0046] In this way, when the pitch indicator 10 is placed adjacent to the intended installation location of the dish members 4a on the wale-raising material 3, the indicator 12 protrudes above the surface of the available water, making it easy to visually see that the dish members 4a should be installed in front of each indicator 12. Furthermore, by disposing the plate member 4a adjacent to the fitting member 11, the pressing portions 7 of the plate member 4a can be easily aligned in a straight line in the width W direction.

[0047] In addition, since multiple plate members 4a placed in the width W direction are connected to form a plate member pitch retainer 4-(2) as shown in Fig. 5(c), multiple plate members 4a can be placed together. Furthermore, the plate member pitch retainer 4-(2) can reliably fix the spacing between the newly placed (right side in Fig. 5(c)) wale-raising members 3-(2) at the same spacing as the previously placed (left side) wale-raising member 3-(1).

[0048] <Deformation prevention frame moving process> With the pitch indicator 10 installed, a part of the deformation prevention frame 2 shown in Figure 1, including the bottom frame 2x, or the entire deformation prevention frame 2 is placed on a cart 20 (omitted in Figure 5(c)) as shown in Figure 7, and then moved toward the display device 12 of the pitch indicator 10.

[0049] In this case, it is preferable to use a platform for the trolley 20 that is specifically designed for transporting the deformation prevention frame 2, which has an opening at least in the portion where the jack bolts 4b of the bottom frame 2x of the deformation prevention frame 2 are handled, and which is high enough to pass over the dish member 4a fitted into the belly-raising material 3.

[0050] <Deformation prevention frame installation process> When the dolly 20 is stopped at a predetermined position relative to the indicator 12 illustrated in FIG. 7 (in this figure, the deformation prevention frame 2 already installed on the rear dish member 4a is omitted for ease of viewing), the insertion hole 2h of the bottom frame 2x of the deformation prevention frame 2 vertically coincides with the pressing portion 7 of the dish member 4a. Then, the jack bolt 4b is screwed into the insertion hole 2h of the bottom frame 2x while being screwed into the pressing portion 7. At this time, only the bottom frame 2x of the deformation prevention frame 2 may be moved onto the dish member 4a and the deformation prevention frame 2 may be assembled on top of it, or the entire deformation prevention frame 2 already assembled at a different location may be transported onto the dish member 4a on the wale-raising material 3 where it is to be installed, and simply fixed with the jack bolt.

[0051] As shown in Figure 8, after completing the installation of the deformation prevention frame 2 on the dish member pitch holder 4-(2), measure the distance d2 of one wale-raising material 3 from the rear pitch indicator 10-(1) or leave the dimension d1 from the end of the endmost wale-raising material 3-(2) and install a new pitch indicator 10-(2).

[0052] Once the new pitch indicator 10-(2) is installed, the rear pitch indicator 10-(1) will no longer function and will be removed to be used for installing new supports. Before or after removing the rear pitch indicator 10-(1), a new wale support 3-(3) will be installed. Then, in accordance with the pitch indicator 10-(2), a dish member pitch holder 4 (not shown) is installed immediately in front of it, and the next deformation prevention frame 2 is installed, etc. This procedure is repeated to proceed with the installation of the support 1. By using the above method, the support 1 can be installed as shown in FIG.

[0053] As described above, according to the pitch indicator 10 and support installation method of the present invention, even when it is difficult to see below the water surface, the position of the dish member 4a in the water can be easily identified, avoiding the need to spend time searching for it by hand.

[0054] Therefore, the pitch indicator 10 of the present invention makes it extremely easy to install the dish member 4a across the end area 3e of the wale-raising members 3, 3 arranged in series in the pipe axis L direction, and to align the bottom frame 2x of the deformation prevention frame 2 with the dish member 4a, and allows for rapid fixing with the jack bolts 4b. Therefore, the pitch indicator 10 and support installation method of the present application have the effect of enabling the installation work of the deformation prevention frame 2 to be performed extremely efficiently while service water is flowing.

[0055] In the above embodiment, the fitting member 11 is exemplified as having the same number of gripping portions 13 connected as the number of wale-raising materials 3 arranged adjacent to each other in parallel, but the number of connected gripping portions 13 may be less than the number of wale-raising materials 3. By making the number of connected gripping portions 13 equal to or less than the number of wale-raising materials 3, an effect is achieved that it becomes easier to arrange the gripping portions 13 appropriately according to the curved shape of the inner wall surface of the rehabilitating pipe X.

[0056] Furthermore, the pitch indicator 10 may be used not only on the inner bottom surface X2 but also on the inner side surface X3. In this case, the pitch indicator 10 does not necessarily need to use the indicator 12.

[0057] In the above embodiment, the configuration in which the dish members 4a are connected to each other has been exemplified, but the dish members 4a do not have to be connected in plurality and may be used one by one.

[0058] In addition, the positional relationship between the dish member 4a or dish member pitch holder 4 and the pitch indicator 10 may be set so that when the step portion of the engaging member 11 is brought into contact with a part of the deformation prevention frame 2 or the trolley 20, the insertion hole 2h of the deformation prevention frame 2 and the pressing portion 7 of the dish member 4a are aligned vertically. By adopting such a configuration, the installation position of the deformation prevention frame 2 can be indicated more accurately, and the installation efficiency of the support 1 can be improved.

[0059] Also, the connecting portion 14 of the fitting member 11 may be formed of a deformable thin steel plate so as to be bendable. By configuring the fitting member 11 in this manner, it is possible to adjust the shape of the fitting member 11 to match the shape of the inner wall surface (particularly the inner bottom surface X2) of the rehabilitating pipe X or the direction of the protruding top surface 3a of the wale-raising member 3. In this case, the insertion wall portion 15 may be appropriately designed and adjusted so as to protrude from the connecting portion 14.

[0060] In addition, the pitch indicator 10 may be temporarily placed at the end of the endmost flank member 3 without leaving a gap for the dish member 4a, and then the pitch indicator 10 may be replaced with the dish member 4a or the dish member pitch holder 4 just before placing the dish member 4a or the dish member pitch holder 4. The step h formed in the fitting member 11 may be partially provided on the connecting portion 14 of the thin plate, or may be directly formed on the gripping portion 13. The step h may be provided by partially erecting a plate member on the connecting portion 14 or the gripping portion 13. [Explanation of symbols]

[0061] 1. Support 2 Deformation prevention frame 3 Waist raising material 4a Plate member 4b Jack bolt 5 Fixtures 6 Upper plate 7 Pressing part 8 Connecting members 10 Pitch Indicator 11 Fitting member 12 Indicators 13 Grip part 14 Connection part 15 Insertion wall 20 Carts h Step X rehabilitation pipe

Claims

1. This is used when installing a support that includes a plurality of rod-shaped belly-raising materials, a deformation prevention frame, and a bolt with a countersunk member, which are used to prevent deformation of the rehabilitation pipe when filling a backfill material between the existing pipe and the rehabilitation pipe, A pitch indicator having a gripping portion positioned on the flaps to indicate the installation position of the disk member.

2. 2. The pitch indicator of claim 1, further comprising an indicator that is removably attached to said grip portion.

3. A pitch indicator as described in claim 2, wherein at least two of the gripping portions are provided so that they can be placed on a plurality of wale-raising materials arranged parallel to each other at intervals in the circumferential direction of the inner wall surface of the rehabilitation pipe, and the respective gripping portions are connected to each other by connecting portions.

4. At least a part of the connecting portion is a step portion between the upper surface of the grip portion, or a step is provided on the connecting portion or the grip portion, 4. The pitch indicator according to claim 3, wherein the step portion constitutes a stopper against which the deformation prevention frame or a cart transporting the deformation prevention frame comes into contact.

5. The connecting portion is formed with a locking portion to which the indicator can be attached, The locking portion is a female screw hole into which an end of the indicator is screwed and held, 5. The pitch indicator according to claim 4, wherein said indicator is rod-shaped as a whole and has a male screw portion formed at one end thereof for screwing into said female screw hole.

6. The pitch indicator according to claim 3 , wherein the connecting portion is deformable to fit the shape of the inner wall surface of the rehabilitating pipe.

7. A pitch indicator as described in any one of claims 1 to 6, which has two or more dish members that are arranged at each end of a plurality of wale-raising materials arranged parallel to each other at intervals in the circumferential direction of the inner wall surface of the rehabilitation pipe, connect to each other in the circumferential direction, and constitute a dish member pitch retainer that fixes the positional relationship between adjacent wale-raising materials in the circumferential direction.

8. When installing supports inside a rehabilitated pipe formed inside an existing pipe, a wale-raising member installation process for arranging a wale-raising member in the axial direction of the rehabilitating pipe; A pitch indicator installation process for arranging the pitch indicator according to any one of claims 1 to 6 at a position where a plate member for pressing the wale-raising material is arranged at an end of the wale-raising material or adjacent to a position where the plate member is arranged; a deformation prevention frame moving step of moving the deformation prevention frame close to the display device and then arranging at least a part of the deformation prevention frame above the dish member; and a deformation prevention frame installation step of fixing the wale-raising member and the deformation prevention frame with a fixing device.

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