Partition construction method for backfill space in pipe lining construction and partition steel plate used in said construction method

Abstract

To improve workability of lining construction involving backfill injection by eliminating the difficulty that, as a pipe length increases, backfill injection pressure increases, making it difficult to control the pressure of a backfill material, which can cause deformation or damage to a lining pipe, in lining construction in which a lining pipe is inserted into an existing pipe as a rehabilitation pipe, and a cement milk-like backfill material is injected into a backfill space between the two pipes.SOLUTION: A lining pipe R is molded inside a culvert P using a self-propelled pipe-making device, and at an intermediate portion of lining molding, a partition steel plate 50 consisting of two slidable plates, one fixed and one movable, is installed as a partition. After the pipe-making device passes therethrough, the movable steel plate is dropped toward the lining pipe R side, thereby dividing a backfill space K into two backfill spaces on upstream and downstream sides, and a backfill material is injected into each backfill space K.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to a backfilling construction method for lining construction in which a self-propelled pipe making device that moves by itself within a circular cross-section culvert continuously feeds out a long, plate-like strip member, which is spirally wound to place a circular cross-section lining pipe on top of it, and backfilling material is injected into the backfill space between the culvert and the lining pipe, and to construction members used in said lining construction. [Background technology]

[0002] In the construction of pipe linings, which involves installing a lining pipe inside an existing pipe, backfill injection construction has traditionally been carried out, in which cement milk backfill material is injected all at once into the backfill space between the existing pipe and the lining pipe. However, as the lining pipe becomes longer, the backfill space also becomes larger in volume. i. Normal pressure takes a long time to fill, cement hardening takes a long time, etc., making it difficult to work. ii. The pressure of the backfill material injected into the backfill space also increases, causing deformation of the lining pipe. We can point out some of the difficulties, such as: Therefore, in order to speed up the backfilling work and prevent deformation of the lining pipe, cement milk is injected from both the upstream and downstream pipe openings. However, in this case, the filler is not mixed smoothly at the confluence of the cement milk from the upstream and downstream sides, i.e., the middle part, which causes uneven filling (uneven construction) in the middle part. Furthermore, in this construction, pressure control, which must be kept below the withstand pressure of the lining pipe to prevent deformation of the lining pipe, is also difficult. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-32968 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above circumstances, the present invention aims to provide a new backfilling construction method that eliminates the drawbacks of the conventional backfilling construction that is carried out all at once, eliminates uneven filling of backfilling material at confluences, and improves the efficiency of backfilling construction by increasing the speed of backfilling injection and facilitating control of injection pressure. The inventor made this invention based on the knowledge that the above-mentioned object can be achieved by placing a partition steel plate at the confluence, or in other words, the partition section that is the planned confluence section, to reliably block the backfill material flowing into the confluence. [Means for solving the problem]

[0005] The partition construction method for a backfill space in a lining construction inside a sewer pipe and the partition steel plate used in the construction method of the present invention specifically have the following configurations. (First invention) The first aspect of the present invention relates to a partition construction method for a backfill space in a lining construction inside a sewer, and as described in claim 1, In a pipe lining construction method in which a self-propelled pipe making device S is used in a circular cross-section pipe P to spirally wind a continuously fed strip-shaped member 100 to form a circular cross-section lining pipe R on the bottom of the pipe P, and a fluid backfilling material M is pumped and injected into a backfilling space K between the pipe P and the lining pipe R, A method for constructing a lining inside a sewer, comprising providing a partition portion that divides the backfill space K into an upstream side and a downstream side in an intermediate portion of the length of the lining pipe R to be manufactured, In the partition section, a two-layer slidable partition iron plate 50 consisting of a fixed plate 51 and a movable plate 52 is fixedly installed on the inner surface of the tubular culvert P, with the top of the tubular culvert P being axially symmetrical, and having a cross-sectional area that substantially blocks the backfill space K, While the movable plate 52 of the partition iron plate 50 is pulled outward, the pipe making device S is passed inside the partition iron plate 50, and the movable plate 52 of the partition iron plate 50 is dropped onto the outer surface of the lining pipe R. It is characterized by: (Second Invention) The second aspect of the present invention is a member that is applied to the partition construction method for the backfill space in the lining construction inside the sewer, and as described in claim 2, The partition iron plate 50 has a cross-sectional area that substantially blocks the backfill space K and is made up of two overlapping slidable plates, a fixed plate 51 and a movable plate 52. In the above, symbols are not included in the scope of rights. The first and second inventions can be understood from the following embodiments. Furthermore, in the above, "Substantially sealing the backfill space" means not including the unsealed area below the cross section of the backfill space.

[0006] (action) The pipe making device S passes inside the partition iron plate 50 in the raised state without coming into contact with the partition iron plate 50. The movable plate 52 is dropped onto the outer surface of the lining pipe R by gravity. By dropping the movable plate 52 of the partition iron plate 50, the partition iron plate 50 essentially blocks the backfill space K, and the gap between the culvert P and the lining pipe R becomes sealed. Regarding the filling of the backfilling material M, after sealing 20 the pipe opening on the upstream side, the backfilling material M is injected from the upstream pipe opening into the backfilling space K between the partition iron plate 50, performing the initial early backfilling construction. Next, the lining pipe R is manufactured up to the downstream pipe opening, the downstream pipe opening is sealed, and the backfilling material M is injected from the downstream pipe opening into the backfilling space K between the partition iron plate 50 in the same manner as above, performing the later backfilling construction. When injecting the backfill material M, appropriate supports H are installed inside the lining pipe R to prevent deformation of the lining pipe R and to prevent the lining pipe R from floating up. [Effects of the Invention]

[0007] By installing the partition steel plate, the backfill material does not mix as it would with conventional simultaneous injection construction, and a high-quality, dense backfill layer can be obtained. The length of backfill material filled is half that of conventional full-length construction, the injection pressure is significantly reduced, the injection speed is faster, and efficient construction can be achieved. In addition, the reduction in injection pressure makes injection management easier, allowing for reliable backfill construction. Furthermore, by using partition steel plates to construct partitions during construction, it is possible to respond to unexpected or planned interruptions to construction, allowing for flexible construction methods. [Brief explanation of the drawings]

[0008] [Figure 1] Overall diagram showing construction procedures. [Figure 2] A longitudinal cross-sectional view showing the manufacturing process of the lining pipe R by the pipe manufacturing device S inside the sewer (a partial view of the two arrows in Figure 3). [Figure 3] FIG. 3 is a front view of the frame part of the pipe making device (viewed in the direction of the arrow 3 in FIG. 2). [Figure 4] 10 is a diagram showing the arrangement of partition iron plates 50 in the partition section (a cross-sectional front view of the pipe P). [Figure 5] (a) is a partial side view and partial cross section showing the installation state of the rail member 40, (b) is a front view of the rail member 40 (a) is a cross section ...). [Figure 6] FIG. 10 is a front view of the partition iron plate 50 in a fixed state. [Figure 7] 7 is a cross-sectional view of the partition iron plate 50 in a fixed state (a cross-sectional view taken along line 7-7 in FIG. 6). [Figure 8] FIG. 10 is a front view of the partition iron plate 50 in a movable state. [Figure 9] 9 is a cross-sectional view of the partition iron plate 50 in a movable state (a cross-sectional view taken along line 9-9 in FIG. 8). [Figure 10] FIG. 3 is a cross-sectional view showing the installation state of the pipe opening seal 60. [Figure 11]FIG. 1(a) is a cross-sectional view showing one embodiment of a belt-shaped member used in the present invention, and FIG. 1(b) is a cross-sectional view showing the joining relationship of this belt-shaped member. [Figure 12] 10 is a diagram showing how to install the partition iron plate 50. FIG. [Figure 13] Schematic diagram of the air venting means for later backfill injection. [Figure 14] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a partition construction method for a backfill space in a lining construction inside a sewer pipe and a partition steel plate used in the construction method according to the present invention will be described with reference to the drawings. 1 to 14 show one embodiment of the present invention. That is, Figure 1 shows an overview of the construction method for partitioning the backfill space in lining work inside the main sewer, Figures 2 and 3 show the overall schematic configuration of the spiral-wound circular cross-section pipe lining pipe production device S (hereinafter abbreviated as ``pipe production device'') inside the sewer that is applied to this construction method, Figures 4 to 10 and Figures 12 to 14 show the construction guidelines for the partition construction process of the backfill space, which is a key part of this construction method, and Figure 11 shows one embodiment of a strip-shaped member 100 used in this construction method. In these figures, P indicates a culvert with a circular cross section, and R indicates a lining pipe produced by this pipe production device S. The direction of travel of the lining pipe R produced by this pipe production device S (arrow A, see Figures 1 and 2) is used to refer to the front and rear.

[0010] Lining pipe R construction (See Figure 1) Figure 1 shows the longitudinal cross-sectional structure of sewer pipe P during construction of the lining inside the main pipe, where Q1 is the upstream manhole, O1 is its opening, Q2 is the downstream manhole, O2 is its opening, and E is the ground where pipe P will be buried. In this construction work, construction will be carried out from the upstream manhole Q1 side towards the downstream manhole Q2 side. At the aboveground portion, an unwinding device T for the strip-shaped material 100 is installed on the upstream side, and the strip-shaped material 100 is continuously supplied by this unwinding device T from the manhole Q1 to a lining pipe making device S (hereinafter simply referred to as the "pipe making device") installed inside the lining pipe. As an example of the configuration of the unwinding device T is shown in the figure, a turntable 204 is rotatably arranged via a roller 202 on a circular track 200 arranged around the opening of the manhole Q1, and a winding drum 206 around which the strip-shaped material 100 is wound so as to be freely unwound is rotatably supported on this turntable 204. Furthermore, a hydraulic unit G is installed on the downstream side, which supplies pressurized oil to the pipe making device S via piping (32, described below). M is a backfill material of cement milk.

[0011] Strip-shaped member 100 (See Figure 11) Before describing the method for lining a tubular culvert according to this embodiment, the strip-shaped member used in this method will be described. FIG. 11 shows an example of a strip-shaped member applied to the main sewer lining construction method. The belt-shaped member 100 has a flat plate-like body of a uniform thickness, and an appropriate number of ridges 102 (five in the illustrated example, usually three) are continuously provided vertically along the length of its outer surface. Flanges 102a are formed at the tips of the ridges 102. Grooves 104 or groove spaces are formed between the ridges 102. The inner surface 106 is formed to be substantially smooth. Joints 100A, 100B that overlap and engage with each other are formed on both sides of the belt-shaped member 100. That is, the leading edge side joint 100A has a protrusion 102A at its front end which has an expanded base and a vertical groove 110 extending from its inner surface, with a protrusion 112 continuing from the protrusion 102A. The trailing edge side joint 100B has a protrusion 114 extending from the protrusion 102B at its rear end, with a vertical protrusion 116 extending toward the end of the protrusion 114 which engages with the groove 110 of the leading edge side joint 100A. Furthermore, in this embodiment, a sealant 118 is interposed between the contacting portions of the protruding portions 112 and 114 to enhance sealing. The strip-shaped member is made of a synthetic resin material, and from the viewpoint of formability, polyvinyl chloride (PVC) resin is particularly suitable as it can be continuously molded by extrusion molding. During joining, the leading and trailing edges of adjacent belt-shaped members 100 overlap, and the leading-edge joining portion 100A and the trailing-edge joining portion 100B are sandwiched between the outer and inner rollers of the joining roller unit (described later), with the ridge 116 fitting into the recessed groove 110 and the end of the protrusion 112 fitting into the flange 102a of the protrusion 102B, thereby joining. In this case, the primary engagement is formed by the recessed groove 110 and the ridge 116, with the protrusion 112 and the protrusion 102B forming a secondary engagement. Note that if the fitting engagement at the joining portions 100A and 100B is sufficient, the sealant 118 can be omitted.

[0012] Lining pipe manufacturing equipment S (See Figures 2 and 3) The schematic configuration of the pipe making apparatus S will be described with reference to Figures 2 and 3. This lining construction device S is mainly composed of an annular mounting frame 1, a plurality of guide rollers 2 arranged at a predetermined pitch on the outer periphery of the mounting frame 1, and a joining mechanism 5 that is attached via the mounting frame 1 and includes an inner surface roller 3 and an outer surface roller 4. A feed mechanism 22 is added to this joining mechanism 5.

[0013] Mounting Frame 1 (See Figures 2 and 3) The mounting frame 1 is annular, with a predetermined width and thickness to ensure the required rigidity. Part of the annular shape is recessed to serve as the mounting portion for the joining mechanism 5. The mounting frame 1 is made up of an appropriate number of segments, and each segment is made up of side plates 10 (front side plate 10A, rear side plate 10B) on the front and rear sides, and flanges 11 on both ends to form a rigid frame. The flanges 11 are then abutted against each other and assembled with bolts and nuts (not shown). Bearing recesses 13 are recessed at predetermined intervals on the outer edges of the side plates 10 to receive the shafts of the guide rollers 2. The mounting portion of the joining mechanism 5 is recessed in a V shape toward the center, and the front plate 10A of this portion in the rotational direction is positioned further rearward than the front plates 10A of the other segments and is narrow. This rearward recess is wide enough to accommodate the strip-shaped member 100. The front plate 10C of the V-shaped portion is used for mounting the joining mechanism 5. Reference numeral 15 denotes a bolt insertion hole. Guide roller 2 (See Figures 2 and 3) The guide rollers 2 are arranged at predetermined intervals and at predetermined angles on the outer periphery of the mounting frame 1. The mounting angle θ (not shown) of the guide rollers 2 is perpendicular to the strip-shaped member 100 that constitutes the lining pipe R. The roller body 17 of the guide roller 2 is made of a hard synthetic resin or metal body, and is rotatable around the roller shaft 18 via a bearing, and abuts against the inner surface of the strip-shaped member 100. Joining mechanism part 5 (See Figures 2 and 3) The joining mechanism unit 5 is attached to the mounting frame 1 via the front side plate 10C of the mounting frame 1, and mainly comprises a joining roller unit 20 consisting of a pair of an inner roller 3 and an outer roller 4. It also houses a gear mechanism that rotates these rollers 3, 4 synchronously, and includes a box 23 that holds a feed mechanism 22 that is linked to the gear mechanism, and a hydraulic motor 24 attached to the box 23 as a rotational drive source for the rollers 3, 4, and is positioned corresponding to the joining portion of the spirally wound strip-shaped member 100, i.e., the position where the strip-shaped member 100 is first closed. (Box 23) (See Figure 2) The box body 23 has four walls on both the front and back sides to maintain its rigidity, and is divided into an upper and lower section, with the upper section being openable around a pin shaft on the side. The box body 23 also holds the shaft of the gear mechanism inside. A hydraulic motor 24 is attached to the front section of the box body 23, and the rear section is abutted against and fixed to the front plate 10C of the mounting frame 1. A closing device that closes the upper section to the lower section is attached to the other side of the box body 23. Furthermore, spacer rollers 26 for maintaining spacing are rotatably attached to the shafts of the gear mechanism inside the box body 23. The spacer rollers 26 have substantially the same diameter (including a smaller diameter) as the feed rollers 28 of the feed mechanism 22 described below, and their outer peripheries abut against the inner wall surface of the culvert P. Note that the spacer rollers 26 may be omitted as appropriate. (Feed mechanism 22) (See Figure 2) The feed mechanism 22 is comprised of a drive sprocket fixed to the shaft of the gear mechanism outside the box body 23, a feed roller unit with a sprocket rotatably mounted on another shaft of the gear mechanism, and a chain wound around the gears of both sprockets. The feed roller 28 is integral with the feed roller unit with a sprocket. The sprocket-equipped feed roller section, i.e., the feed roller 28, contacts the pipe wall of the pipe P, and its rotation determines the rotational speed of the present pipe making device S, which speed is synchronized with the forming speed of the lining pipe R made by the joining roller section 20 or slightly faster than that forming speed. In this pipe making apparatus S, the diameter d including the feed rollers 28 of the feed mechanism 22 is the maximum diameter and is set smaller than the diameter D of the pipe P (see FIG. 2). In other words, the diameter d plus the thickness (α) of the strip-shaped member 100 (d + α) is set to be sufficiently smaller than D, and in this embodiment, the length is determined in anticipation of the installation of a partition iron plate (and thus passage inside it) as described below. (Hydraulic motor 24) (See Figure 2) The hydraulic motor 24 is attached to the front surface of the box body 23 with its drive shaft connected to the shaft portion of the gear mechanism inside the box body 23 . The hydraulic motor 24 is connected to piping consisting of an in-side piping that supplies oil to the hydraulic motor 24 and an out-side piping that discharges oil from the hydraulic motor 24. These pipings are further connected to a rotary joint 30 that is attached to an appropriate position on the box 23 or the mounting frame 1, and the rotary joint 30 is connected to an external piping 32 that is connected to an external pressure source (see Figure 1). Through this rotary joint 30, working fluid is exchanged between the piping on the hydraulic motor 24 side that involves rotation and the external piping 32 that does not involve rotation. (Joining roller portion 20) (See Figures 2 and 3) The joining roller unit 20 is configured such that an inner roller 3 and an outer roller 4 are arranged side by side in the axial direction of the pipe, with a predetermined gap maintained between them so that the strip-shaped member 100 is sandwiched between the rollers 3, 4. The inner roller 3 is cylindrical and comes into close contact with the inner surface of the strip-shaped member 100, and supports the strip-shaped member 100, including the closing portion H where the strip-shaped members 100 first close together, which is pressed from the outside by the outer roller 4. The inner roller 3 is attached directly to a shaft portion of a gear mechanism inside the box body 23, and the outer roller 4 is attached directly to another shaft portion that rotates in the opposite direction to the shaft portion.

[0014] Partition construction The following describes the partition construction of the backfill space in the lining of the pipe of this embodiment, which is performed using the above-mentioned pipe making apparatus S. (Overview of this construction) This partition construction is carried out in the following order of steps. In this embodiment, backfill injection work is carried out inside the medium to large diameter culvert P using the self-propelled pipe making device S. 1) Installation and preparation of pipe manufacturing equipment S 2) Pipe manufacturing for early lining pipe R 3) Partition construction, preparation for backfill injection, and support work 4) First backfill injection 5) Construction of late lining pipe R 6) Final backfill injection 7) Completion of construction

[0015] The steps will be explained below in order. Process (1) Installation and preparation of pipe manufacturing equipment S This lining pipe making device S is carried into the circular cross-section pipe P to be rehabilitated through a manhole Q1. In this pipe making apparatus S, the mounting frame 1 is configured so that it can be assembled from separate parts, and the joining mechanism unit 5 can be attached to this mounting frame 1, making on-site assembly easy. The joining mechanism unit 5 is attached to the mounting frame 1 by attaching fixing bolts to the rear surface of its box body 23 and to the side plate 10C of the mounting frame 1. As mentioned above, an unwinding device T for the strip-shaped material 100 is installed on the upstream side of the aboveground portion, and a hydraulic unit G for supplying pressurized oil to the pipe making device S via piping 32 is arranged on the downstream side.

[0016] Process (2) Pre-lining pipe manufacturing The pipe manufacturing equipment S carried into the sewer P performs the following functions to make the lining pipe R: The pipes are then molded and manufactured as follows: At the starting end of the manhole Q1 of the sewage P, the strip-shaped member 100 pulled in from above ground is wound several times by the joining mechanism unit 5 of this pipe making device S to produce the initial lining pipe (Ro). In the joining mechanism unit 5, the inner roller 3 and outer roller 4 of the joining roller unit 20 are arranged at the closure part H of the initial lining pipe Ro and exert a clamping action. Next, the joining mechanism unit 5 is rotated, and the clamping force between the inner roller 3 and the outer roller 4 joins the newly supplied strip-shaped member 100, which is connected to the initial lining pipe Ro, at the closure portion H of the wound strip-shaped member 100 due to its joint structure. At the same time, the engagement and guiding action of the annular flange formed on the outer surface of the outer roller 4 and the groove 104 of the strip-shaped member 100 causes the joining roller unit 22 to revolve in the circumferential direction of the pipe and advance in the axial direction of the pipe. As the joining mechanism unit 5 rotates, the pipe making device S rotates as a whole and advances at a predetermined pitch, so that the pipe making device S moves forward. As a result, the strip-shaped member 100 is wound spirally, and a lining pipe R of the predetermined diameter is produced. In this process, the feed roller portion 28 of the feed mechanism 22 abuts against the pipe wall of the tubular culvert P and rotates in the direction in which the pipe making device S rotates, i.e., in the forward direction, thereby allowing the pipe making device S to rotate smoothly. In other words, when the joining mechanism unit 5 is in the upper position, there is no contact between the present pipe making apparatus S and the wall surface of the pipe beam P, and there is no problem with its rotational movement. As the joining mechanism unit 5 moves downward, the feed roller unit 28 of the feed mechanism 22 comes into contact with the wall surface of the pipe beam P. The feed roller unit 28 is the outmost protruding part of the joining mechanism unit 5, preventing contact with the wall surface of the outer surface roller 4. When the joining mechanism unit 5 is at the lowest end, the feed roller unit 28 is subjected to the greatest load, but the spacer roller 26 shares the load applied to the feed roller unit 50. Furthermore, the feed roller unit 28 comes into contact with the wall surface of the pipe P, and as it rotates, it receives a reaction from the wall surface, imparting a rotational force to the present lining pipe making apparatus S, contributing to the smooth rotation of the present pipe making apparatus S.

[0017] Process (3) Partition construction, preparation for backfill injection, and support work (see Figures 4 to 10) Process (3-1) Partition structure (see Figure 4) First, just before the planned location where the partition is to be installed, with the joint 5 of the pipe making device S at or near the top of the pipe culvert P, the operation of the pipe making device S is stopped, and a rail member (40, described below) and a partition iron plate (50, described below) are sequentially attached to the installation location of the partition using the procedure described below. The partition may be installed at the beginning of the lining work.

[0018] Process (3-1a) Rail member 40 and its installation (see Figures 4 and 5) Rail members 40 are attached to the inner wall surface of the pipe P with screws 45 at multiple locations (four locations on both side walls in this embodiment, see Figure 4) at predetermined intervals around the circumference of the pipe P, over a certain length j in the pipe axis direction (see Figure 5(a)). 5(a), (b), and (c) show the detailed structure of this rail member 40. That is, the rail member 40 has a T-shaped cross section composed of a vertical plate portion 41 and a flange plate portion 42, and the vertical plate 41 and the flange plate portion 42 have screw insertion gaps 41a and screw insertion holes 42a at a predetermined distance to receive the screws 45. The rail member 40 is attached to the culvert P by screwing the threaded portion of the threaded rod 45b of the screw 45 into the wall of the culvert P until the head 45a of the screw 45 abuts against the outer surface of the flange plate portion 42.

[0019] Process (3-1b) Partition iron plate 50 and its installation (see Figures 4, 6 to 9) Next, a partition iron plate 50 that forms the main part of the partition portion is attached to the rail member 40. Figure 4 shows the overall layout of this partition (a cross-sectional front view of the culvert P). In this figure, the gap between the culvert P and the lining pipe R (i.e., the backfill space K) is enlarged and exaggerated to show the mounting structure of the partition iron plate 50. As shown in the figure, the partition iron plate 50 consists of a central plate 50A that blocks the top of the backfill space K in the pipe P, and two side plates 50B that block both sides of the backfill space K. When the partition iron plate 50 is in operation, it essentially blocks the entire backfill space K, but in Figure 4 it is in an inoperative state, i.e., the movable plate (52, described below) portion of the partition iron plate 50 remains pulled up, and the backfill space K in the partition portion forms a passage space Ko that allows the pipe making device S to pass through.

[0020] 6 to 9 show the detailed structure and operation of this partition iron plate 50. As shown in these figures, the partition iron plate 50 comprises a fixed plate 51 and a movable plate 52 arranged in contact with the front surface of the fixed plate 51, and both plates 51, 52 are fixed by fastening fixtures 53. (Fixed plate 51) The fixing plate 51 comprises an arc-shaped flat plate portion 511 of a predetermined thickness and width and a flange portion 512 extending rearward from the upper edge of the flat plate portion 511. The upper edge 51A of the fixing plate 51 corresponds to the curvature of the inner surface of the pipe P, and the lower edge 51B has the same curvature as the upper edge. Notched recesses 513 are formed above both end faces 51C of the flat plate portion 511, avoiding the flange portion 512, to receive the flange portion 42 of the rail member 40. Furthermore, a plurality of (at least two or more) screw holes 51a (three in this embodiment) are formed near the lower edge of the flat plate portion 511. The curvature of the lower edge 51B of the fixing plate 51 is appropriately determined within a range that ensures the aforementioned passage space Ko. The inclination angle of both end faces 51C of the fixing plate 51 directly contacts the adjacent side plate 50B.

[0021] (Movable plate 52) The movable plate 52 is a flat plate with a smaller arc shape than the flat plate portion 511 of the fixed plate 51. Its upper and lower edges 52A and 52B conform to the curvature of the outer surface of the lining pipe R. A plurality of (three in this embodiment) elongated holes 52a are vertically arranged parallel to one another over a certain length k (only the reference sign is used) corresponding to the phase (position) of the screw holes 51a in the fixed plate 51. The length k of the elongated holes 52a determines the stroke, i.e., the travel distance, of the movable plate 52. This length k corresponds to the spacing distance of the passage space Ko of the partition iron plate 50. The curvature of the upper edge 52A of the movable plate 52 is appropriately determined within a range that can secure the elongated holes 52a. Furthermore, both end surfaces 52C of the movable plate 52 come into contact with the adjacent side panels 50B when the movable plate 52 slides.

[0022] (fixture 53) The fixing device 53 comprises a bolt rod 53a and a nut portion (nut head) 53b at its head, and the bolt rod 53a is inserted into the elongated hole 52b of the movable plate 52 from the movable plate 52 side, and the nut head 53b is turned and tightened to screw the threaded portion of the bolt rod 53a into the screw hole 51a of the fixed plate 51, thereby pressing and fixing the movable plate 52 to the fixed plate 51. At this time, the movable plate 52 is pulled up to the outermost position of the fixed plate 51 and takes up a fixed state.

[0023] (Installation) (See Figure 12) The partition iron plate 50 is attached to the rail member 40 as follows. The movable plate 52 is pressed against the fixed plate 51 by rotating and tightening the fixture 53, and the partition iron plate 50 in the fixed state is fitted into the flange 42 of the rail member 40 from the front, and in this state, the flange 512 of the fixed plate 51 is pushed inward along the gap with the culvert P to a predetermined position on the rail member 40 (i.e., the installation position of the partition). At this time, the screws 45 of the rail member 40 do not protrude from the surface of the vertical plate portion 41 of the rail member 40, and the notched recesses 513 of the fixed plate 51 are pushed into the culvert P by the guiding action of the rail member 40. At the position of the partition, the partition iron plate 50 undergoes a slight angular displacement, and the tip of its flange 512 abuts against the inner wall surface of the culvert P, closing the gap with the culvert P.

[0024] Side plate 50B (See Figure 14) 14 shows the front structure of the side plate 50B. The side plate 50B has a movable plate that falls due to gravity in the same manner as the central plate 50A. That is, as shown in the figure, the partition iron plate 50' of the side plate 50B is made up of a fixed plate 51' and a movable plate 52', and the movable plate 52' is pressed and held to the fixed plate 51' by turning and tightening a screw 53' that is threaded into a screw hole 51a' (not shown) of the fixed plate 51', and when the screw 53' is released, the movable plate 52' falls by gravity along the elongated hole 52a' to the outer surface of the lining pipe R, sealing it. A plurality of elongated holes 52a' (two in this embodiment) are recessed in parallel to each other. Regarding the curvature of the partition iron plate 50', the upper edge 51A' of the fixed plate 51' abuts against the inner surface of the pipe P with that curvature, and the lower edge 51B' has a curvature that maintains a certain distance from the lining pipe R, maintaining a passage space K0. The lower edge 52B' of the movable plate 52' has a curvature that matches the lining pipe R, and the upper edge 52A' is located midway between the upper edge 51A' of the fixed plate 51' and the lower edge 52B' of the movable plate 52'. In addition, the upper side end surface 52C' of the movable plate 52' moves downward to abut against and close against the side end surface 52C of the movable plate 52 of the center plate 50A.

[0025] Process (3-1c) Advances in pipe manufacturing equipment S After that, the pipe making device S is driven again to make a pipe beyond the location where the partition iron plate 50 is installed. At this time, the pipe making device S passes through the passing space Ko without coming into contact with the partition iron plate 50. In other words, the (gap) distance between the lower edge of the central plate 50A of the partition iron plate 50, i.e., the lower edge of the fixed plate 51, and the lower bottom of the pipe P is made larger than the maximum diameter including the joining mechanism part 5 of the pipe making device S, and therefore, when the joining mechanism part 5 of the pipe making device S moves to the top, it does not come into contact with the partition iron plate 50.

[0026] Process (3-2) Operation of partition iron plate 50 After the above step (3-1) is completed, the backfill space K on the upstream side of the tubular culvert P is sealed. The sealing is performed at the partition and the upstream pipe opening. Process (3-2a) Sealing the partition First, in the partition section, the movable plate 52 of the partition iron plate 50 installed in that section is slid and displaced toward the center of the lining pipe R, and the lower edge of the movable plate 52 is brought into contact with the outer surface of the lining pipe R. That is, an operator rotates the nut head 53b of the fixing device 53 of the partition iron plate 50 from the front of the pipe making device S to release the fixation. As a result, the movable plate 52 slides relative to the fixed plate 51, the center plate 50A is displaced vertically downward along its groove 52a, and the side plate 50B is displaced diagonally downward along its groove, so that the lower edge of the partition iron plate 50 as a whole abuts against the outer surface of the lining pipe R (see Figure 9). Process (3-2b) Sealing the upstream pipe opening (see Figure 10) Next, the upstream pipe opening of the pipe P is sealed with a pipe opening seal 60. 60A indicates the upstream pipe opening seal of the pipe opening seal 60, and is distinguished from the downstream pipe opening seal 60B (described later) downstream, but when there is no difference between the two, they are referred to as pipe opening seal 60. The pipe opening seal 60 is made of clay cement (or quick-setting cement) material and is formed around the entire circumference of the upstream pipe opening over a predetermined length (e.g., 50 mm) in the axial direction of the pipe. This material adheres to the inner surface of the pipe P and the outer surface of the lining pipe R, and over this predetermined length it maintains a high level of liquid tightness against pressurized backfill material. An injection pipe 60a for injecting backfill material is attached to the top of the pipe opening seal 60, passing through the pipe opening seal 60. Furthermore, as shown in Figure 10, in the backfill injection work, an injection plant 62 for cement milk M is installed above ground on the upstream side, and a pipe 63 equipped with a pressure gauge (not shown) is installed in the manhole Q1, connecting the injection plant 62 to the injection port pipe 60a of the pipe port seal 60. A valve 63a is installed in the pipe 63 to cut off the supply of cement milk M from the injection plant 62. Note that I is a joint between the injection port pipe 20a and the pipe 63. As a result, the backfill space K between the upstream pipe opening and the partition is substantially sealed.

[0027] Process (3-3) Installation of shoring (see Figure 1) After the above step (3-2), a support H is installed in the internal space of the lining pipe R. The support H may be one previously proposed by the present applicants in Japanese Patent Application Laid-Open No. 10-121565, or any other conventionally known support H may be used. The support structure prevents harmful deformation of the lining pipe R from the injection pressure of the backfill material M that will be injected later. The support structure may be constructed before or simultaneously with step (3-2). Process (3-3a) Air vent hole (see Figure 13) Prior to the construction of the support and the subsequent construction of the later lining, an air vent hole 65 is drilled in the downstream top portion of the partition steel plate 50 in the immediate vicinity thereof. Furthermore, a removable air vent pipe 66 is inserted into the air vent hole.

[0028] Process (4) First backfill injection (see Figure 10) After step (3) above, the first backfill injection work is carried out. The injection plant 62 is driven to start injecting the backfill material, i.e., injecting fluid cement milk M, into the backfill space K between the partition iron plate 50 of the partition section installed earlier and the upstream pipe mouth seal 60A. That is, the valve 63a of the piping 63 is opened, and the injection port pipe 60a of the pipe mouth seal 60 is opened. The cement milk M is filled at a predetermined pressure into the backfill space K between the upstream pipe opening and the partition, and the air in the backfill space is vented from the bottom of the partition. Once this filling is complete, the bottom of the partition is sealed with clay cement (or quick-setting cement).

[0029] Process (5) Preparation for late lining pipe R production / backfill injection Once the initial backfill injection is completed, the subsequent construction of the later lining pipe R will be carried out in accordance with step (2) up to the downstream manhole Q2. Thereafter, in accordance with the above-mentioned steps (3-2b) and (3-3), sealing work is carried out on the pipe opening seal 60B (only the reference numeral) facing the downstream manhole Q2, and work to install support H inside the lining pipe R is carried out. In parallel with this work, at the downstream manhole Q2, a cement milk plant (62) is prepared on the ground and its piping (63) is prepared inside the manhole Q2.

[0030] Process (6) Late backfill injection After this, the latter backfill injection is carried out in accordance with step (4). That is, the backfill material M of cement milk is injected into the backfill space K from the downstream manhole Q2, and the backfill material M flows upstream until its tip reaches the partition iron plate 50. The cement milk M is pressed against the plate surface of the partition iron plate 50 and becomes dense, forming a homogeneous backfill layer and maintaining the quality of the backfill material. During this process, the air present in the backfill space K is removed through the air vent pipe 66 mentioned above. This prevents uneven mixing of the backfill material.

[0031] Process (7) End of construction After waiting for the cement milk to harden, the support H and other equipment will be removed, and the entire construction will be completed.

[0032] (Aspects of the embodiment) In the previous embodiment, the partition iron plate 50 is installed together with the forming of the lining pipe R, but it may be installed before the lining pipe R is formed. Also, support H may be omitted. However, the backfill injection pressure must be managed so as not to damage the lining pipe R.

[0033] (Effects of the embodiment) By installing the partition iron plate 50, the backfill material M does not mix, which occurs in conventional simultaneous injection construction, and a high-quality, dense backfill layer can be obtained. The filling length of backfill material M is half that of the conventional full-length construction, which significantly reduces the injection pressure and increases the injection speed, allowing for efficient construction. In addition, the reduced injection pressure makes injection management easier, allowing for reliable backfill construction. Furthermore, by using the partition steel plate 50 to construct partitions during construction, it is possible to respond to unexpected or planned interruptions in construction, allowing for flexible construction methods.

[0034] The present invention is not limited to the above-described embodiment, and various design modifications are possible within the scope of the basic technical concept of the present invention. In other words, the following aspects are included within the technical scope of the present invention. 1) In this embodiment, the pipe making device S is placed directly inside the circular cross-section pipe culvert R to make the pipe, but it is also possible to use a construction method in which a backfill layer of concrete is poured in advance at the bottom of the circular cross-section pipe culvert P, and after it has solidified, the pipe making device S is placed on the surface of the bottom backfill concrete layer, and the lining pipe R is formed using the pipe making device S. [Explanation of symbols]

[0035] S...pipe lining manufacturing equipment, P...pipe, R...tubular body (lining pipe), K: Backfill space, M: Backfill material (cement milk) 40... Rail member, 45... Screw, 50... Partition iron plate, 50A... Center plate, 50B... Side plate, 51... Fixed plate, 52... Movable plate, 53... Fixing tool, 60 (60A, 60B)... Pipe opening seal, 100... Belt-shaped member, 100A, 100B... Joint (joint)

Claims

1. A method for constructing a lining inside a pipe, comprising: a pipe making method using a self-propelled pipe making device in which a continuously fed strip-shaped member is spirally wound in a pipe inside a circular cross-section pipe, a lining pipe having a circular cross-section is placed on the bottom of the pipe, and a fluid backfilling material is pumped and injected into a backfilling space between the pipe and the lining pipe; A method for constructing a lining inside a sewer pipe, comprising providing a partition section in an intermediate section of the length of the lining pipe to be manufactured, the partition section dividing the backfill space into an upstream side and a downstream side, In the partition section, a two-layer slidable partition iron plate consisting of a fixed plate and a movable plate is fixedly installed on the inner surface of the tubular culvert, with the top of the tubular culvert being axially symmetrical, and having a cross-sectional area that substantially closes the backfill space, While the movable plate of the partition iron plate is pulled outward, the pipe making device is passed inside the partition iron plate, and the movable plate of the partition iron plate is dropped onto the outer surface of the lining pipe. A method for partitioning a backfill space in a lining construction inside a sewer pipe, characterized by:

2. A member that is applied to the partition construction method for a backfill space in the lining construction inside a sewer pipe according to claim 1, A two-layer slidable partition iron plate having a cross-sectional area that substantially blocks the backfill space and consisting of a fixed plate and a movable plate.

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