Temporary wall and method for repairing a pipe using the temporary wall

Abstract

To provide a temporary wall which can be easily and rapidly installed, is capable of withstanding high water pressure, and is installed during renovation of the pipe conduit to partition the pipe conduit into a repair zone and a temporary flow path to prevent water ingress into the repair zone, and a repairing method of a pipe conduit using the temporary wall.SOLUTION: A temporary wall comprises: a partition wall W1 arranged in a longitudinal direction of a pipe conduit P; and closing walls W2, W3 that seal an opening of a repair zone D at upstream and downstream ends of the partition wall W1. The partition wall W1 and the closing walls W2, W3 comprises a plurality of support columns 2 and a plurality of water stop plates 3. The support column 2 is fixed so as to be erected at the bottom of the pipe conduit P by support means 4, and is equipped with a holding mechanism 5 for the water stop plate 3. The water stop plate 3 is oriented upright from a bottom part of the pipe conduit P by the holding mechanism 5.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a temporary wall installed to partition a conduit into a repair area and a temporary flow path when repairing the conduit and to prevent water from entering the repair area, and a method for repairing a conduit using the temporary wall.

Background Art

[0002] Conventionally, as a repair structure for an aging conduit, many repair structures for a conduit that entirely cover the inner surface of the conduit with an inner lining material have been proposed (see, for example, Patent Documents 1 and 2).

[0003] By the way, when repairing a conduit using such a repair structure for a conduit, when the flowing water in the conduit becomes an obstacle to the repair work, in order to repair the conduit while maintaining the function of the conduit (for example, a sewer pipe), a so-called bypass of the flowing water is required in the conduit portion to be repaired. And, as an example of this bypass, there is a method of pumping up the flowing water with a pump from a manhole on the upstream side of the conduit portion to be repaired, sending it through a hose laid on the ground to a manhole on the downstream side, and discharging it into the downstream conduit (see, for example, Patent Document 3).

[0004] However, the method disclosed in Patent Document 3 requires a large-capacity pump and a large number of hoses, especially in the case of a large-diameter conduit with a large amount of flowing water, making it difficult to secure space on the ground side. Also, even if space can be secured for installing a large-capacity pump and a large number of hoses, it is difficult to secure sufficient flow-down capacity due to fluid loss in the hoses and it is difficult to deal with the problem.

[0005] On the other hand, as a method for repairing a conduit without using a pump or a hose, a method has been proposed in which when repairing a conduit, the conduit is partitioned into a repair area and a temporary flow path by a temporary wall made of a sheet member, and the conduit in the repair area is repaired while preventing water from entering the repair area (see Patent Document 4).

[0006] The method disclosed in Patent Document 4, which divides the repair area and the temporary flow path with a temporary wall made of sheet material, can eliminate the problems of rerouting pumps and hoses. However, since this method is applied to a limited area (manhole), if the temporary flow path is long, or if the volume of water flowing in the sewer pipe is large and the water level rises, the temporary wall made of sheet material may not be able to withstand the water pressure, and there is a risk of accidents such as water leakage or collapse of the temporary wall. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 5746443 [Patent Document 2] Japanese Patent Publication No. 2017-198305 [Patent Document 3] Japanese Patent Publication No. 2001-113600 [Patent Document 4] Japanese Patent Publication No. 2014-214455 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In view of the problems with conventional methods for repairing aging sewer pipes, the present invention aims to provide a temporary wall that can be installed easily and quickly, while also being able to withstand high water pressure, for partitioning a sewer pipe into a repair area and a temporary channel during pipe repair, and for preventing water from entering the repair area, as well as a method for repairing a sewer pipe using this temporary wall. [Means for solving the problem]

[0009] To achieve the above objective, the temporary wall of the present invention is A temporary wall installed to divide the pipe into a repair area and a temporary channel during pipe repair, and to prevent water from entering the repair area, The temporary wall comprises a partition wall arranged along the longitudinal direction of the pipe and a closing wall that closes the opening of the repair area at the upstream and downstream ends of the partition wall. The partition wall and the closing wall are comprised of a plurality of support columns and a plurality of water-stopping plates. The support column is fixed to the bottom of the pipe by a support means and is equipped with a water-stopping plate holding mechanism. The water-stopping plate is erected from the bottom of the pipe by the holding mechanism. It is characterized by the following:

[0010] In this case, the support means may be provided with support beams fastened to the opposing walls of the conduit.

[0011] Furthermore, the support girder can be a truss structure.

[0012] Furthermore, the holding mechanism can be a groove into which the end of the water-stopping plate is inserted.

[0013] Furthermore, at least a portion of the partition wall and the closing wall can be constructed by stacking multiple water-stopping plates between the same support columns.

[0014] Furthermore, at least one of the support columns may be fastened to the wall of the pipe on the temporary channel side by a support cable.

[0015] Furthermore, the water-stopping plate can have a hollow structure with through holes extending in the width direction.

[0016] Furthermore, the water-stopping plate may be provided with a handle.

[0017] Furthermore, at least a portion of the bottom of the aforementioned pipe can be refurbished.

[0018] Furthermore, in order to achieve the same objective, the pipe repair method using a temporary wall of the present invention is the pipe repair method using the above-mentioned temporary wall, The steps include fixing the support column with the support means, A step of constructing a temporary wall provided with the partition wall and the closing wall by installing a water stop plate between the columns, and partitioning the pipe channel into a repair area and a temporary flow path; A step of discharging the water staying in the repair area and making the repair area in a dry state; Including a step of renovating the pipe channel in the repair area. It is characterized by this.

[0019] In this case, at the end of a predetermined operation, a step of removing the water stop plate constituting the closing wall and making the repair area under running water; Before the start of the next operation, a step of installing the water stop plate constituting the closing wall; After performing a step of discharging the water staying in the repair area and making the repair area in a dry state, It can further include resuming the renovation work.

[0020] Also, the repair area can be unrenovated and at least part of the temporary flow path can be renovated.

Effect of the Invention

[0021] According to the temporary wall of the present invention and the method for renovating a pipe channel using the temporary wall, when renovating the pipe channel, the pipe channel is partitioned into a repair area and a temporary flow path, and a temporary wall that can withstand a large water pressure and is installed to prevent the intrusion of water into the repair area can be installed simply and quickly.

Brief Description of the Drawings

[0022] [Figure 1] It is a process explanatory drawing (1) showing an embodiment of the method for renovating a pipe channel using the temporary wall of the present invention. [Figure 2] It is the same process explanatory drawing (2). [Figure 3] It is the same process explanatory drawing (3). [Figure 4] It is the same process explanatory drawing (4). [Figure 5] It is the same process explanatory drawing (5). [Figure 6]This shows one embodiment of the temporary wall of the present invention, a longitudinal cross-sectional view of a pipe with the temporary wall installed. [Figure 7] This is a plan view of the pipe with the temporary wall installed. [Figure 8] The images show the support columns of the temporary wall, with (a) being a plan view, (b) a front view, (c) a side view, and (d) a rear view. [Figure 9] The water-stopping plates of the temporary wall are shown, with (a1) and (a2) being plan views, (b1) and (b2) being front views, and (c1) and (c2) being side views. [Figure 10] This is a front view showing the temporary wall with its support columns erected. [Figure 11] Examples of conventional pipe rehabilitation structures are shown, with (a) being an explanatory diagram showing a pipe rehabilitation structure with a circular cross-section, and (b) being an explanatory diagram showing a pipe rehabilitation structure with a rectangular cross-section. [Modes for carrying out the invention]

[0023] Hereinafter, embodiments of the temporary wall and the method for repairing a culvert using the temporary wall of the present invention will be described with reference to the drawings.

[0024] Figures 1 to 10 show one embodiment of the temporary wall of the present invention and a method for repairing a culvert using the temporary wall. Here, Figures 1 to 7 are simplified diagrams illustrating the temporary wall of the present invention and the method for repairing a pipe using the temporary wall, and the repair length in the pipe axis direction of pipe P can be set arbitrarily. Incidentally, in this embodiment, the distance between the uppermost and lowermost points of the temporary wall in Figure 7 is, for example, approximately 100m. This corresponds to the distance from a predetermined manhole in the pipe to be renovated (a sewer pipe in this embodiment) to the next manhole downstream. In other words, the renovation is carried out by installing a temporary wall between adjacent manholes in the sewer pipe.

[0025] This temporary wall 1 is installed to divide the culvert P into a repair area D and a temporary channel F during the repair of the culvert P, and to prevent water from entering the repair area D. As shown in Figures 1 to 7 (see Figure 2 in particular), it comprises a partition wall W1 arranged along the longitudinal direction of the culvert P, and closing walls W2 and W3 that close the opening of the repair area D at the upstream and downstream ends of the partition wall W1. The partition wall W1 and the closing walls W2 and W3 are each equipped with a plurality of support columns 2 and a plurality of water-stopping plates 3. The support columns 2 are fixed to the bottom of the culvert P by support means 4 and are equipped with a water-stopping plate 3 holding mechanism 5, so that the water-stopping plates 3 are erected from the bottom of the culvert P by the holding mechanism 5. Here, taking into consideration the water flow (water pressure), it is preferable that the partition wall W1, which is arranged along the longitudinal direction of the pipe P, be located at the center in the width direction of the pipe P, and that the closing walls W2 and W3, which close the opening of the repair area D at the upstream and downstream ends of the partition wall W1, be installed at an angle to the longitudinal direction of the pipe P. In Figures 1 to 7, the closing wall W2 is the upstream end, and the closing wall W3 is the downstream end. Also, in Figures 1 to 7, when multiple identical components such as the support column 2 and the water-stopping plate 3 are used, one representative component is assigned a reference numeral to avoid making the diagrams too complex.

[0026] Incidentally, the pipe P targeted for renovation in this embodiment is a box culvert with a rectangular cross-section, but it is not limited to this. In addition to reinforced concrete pipes (Hume pipes) with a circular cross-section, aging pipes constructed using methods other than precast methods are also targeted.

[0027] Furthermore, while a wide range of known rehabilitation pipes used to rehabilitate aging sewer pipes and other existing pipes can be used for the rehabilitation pipe R constructed inside the culvert P during the renovation, in this embodiment, the rehabilitation pipe shown in Figure 11 (FFT Method Association "String Method" (registered trademark)) (see Patent Documents 1 and 2) is used.

[0028] Specifically, the rehabilitation pipe R comprises an annular fixing member (approximately rectangular if the pipe P is rectangular) made of deformed reinforcing bars installed along the inner circumference of the pipe duct P at intervals in the direction of the pipe axis of the rehabilitation pipe R, a connecting member disposed on the fixing member, a strip-shaped inner material made of synthetic resin such as high-density polyethylene installed on the connecting member disposed on the fixing member adjacent to the pipe axis of the rehabilitation pipe R via a spacer that defines the distance between the connecting member, and a fastener made of synthetic resin such as high-density polyethylene or thermoplastic elastomer that connects adjacent inner materials and covers the gap between them, and a filler material such as high-flow-rate, high-strength mortar is filled and hardened between the rehabilitation pipe R and the pipe duct P.

[0029] In this embodiment, the support column 2 is constructed using steel materials such as square steel pipes and structural steel, as shown in Figure 8. However, it can also be constructed using other steel materials such as H-shaped steel and round steel pipes, or using metal members other than iron, such as aluminum and stainless steel, or synthetic resin (including composite materials).

[0030] As shown in Figures 1 to 4, 6 and 8, the support column 2 is provided with a groove 21 extending vertically from the support column 2 for inserting the end of the water-stopping plate 3, and a nut 21a (see Figure 8) for screwing in a screw (not shown) to fix the water-stopping plate 3 inserted into the groove 21. The screw that fixes the water-stopping plate 3 is used to press the water-stopping plate 3 toward the repair area D in order to keep the water-stopping plate 3 in a predetermined position until the repair area D becomes dry and the water-stopping plate 3 stabilizes naturally due to the water pressure of the temporary channel F, etc. The water-stopping plate 3 holding mechanism 5 is not limited to this. For example, if a round steel pipe is used for the support column 2, the water-stopping plate 3 holding mechanism 5 can be constructed from the convex curved surface of the round steel pipe and the concave curved surface of the end of the water-stopping plate 3 that is in contact with it.

[0031] The lower part of the support column 2 is provided with base portions 22a and 22b. A packing 22c made of chloroprene rubber or the like is provided on the back surface of base portion 22a on the repair area D side, and a nut 22d for screwing in a level adjustment screw is provided on base portion 22b on the temporary flow channel F side. Here, the bottom of the pipe P to which the base portions 22a and 22b (and the water-stopping plate 3) of the support column 2 rest is not only the bottom of the pipe P before repair, but also, as shown in Figures 3 and 4, the bottom of the repaired pipe P, i.e., the surface of the rehabilitated pipe R. Even in this case, since the support column 2 is supported by the support means 4 described later, the load on the surface of the rehabilitated pipe R is kept to a minimum and does not impair the performance of the rehabilitated pipe R.

[0032] As shown in Figure 10, a wedge receiver 23 is provided in the middle of each support column 2 for attaching a wedge-type scaffolding handrail 6 that connects adjacent support columns 2. The wedge-type scaffolding handrail 6 is used as an alignment member to connect adjacent support columns 2 so that the distance between them matches a predetermined dimension that conforms to the width dimension of the water-stopping plate 3. This makes it easy to determine the installation spacing of the support columns 2 and the support means 4 (particularly the support beam 41 described later). In addition, by connecting adjacent support columns 2, loosening and rattling of the partition wall W1 and the closing walls W2 and W3 can be suppressed. Note that, in order to avoid complicating the diagrams, the wedge-type scaffolding handrail 6 is not shown in Figures 1 to 7.

[0033] In this embodiment, the support means 4 for the support column 2 is provided with support girders 41 fastened to the opposing walls of the culvert P. The support beam 41 is fixed at both ends to the wall surface of the pipe P via anchor bolts, etc., and the support column 2 is fixed at an intermediate position using clamps, etc., thereby supporting the support column 2. The support girders 41 are designed to be lightweight and utilize a truss structure, but are not limited to this; for example, steel pipes or structural steel can also be used.

[0034] Furthermore, in this embodiment, as a means of supporting the support column 2, in addition to the support girder 41, the support column 2 is fastened to the wall on the temporary channel F side of the culvert P by a support cable 42. Here, the support cable 42 is stretched in a direction that resists the water pressure acting on the support column 2 (waterproof plate 3).

[0035] In this embodiment, the support rope 42 is constructed by fixing one end of a short steel wire rope to the wall of the conduit P with an anchor bolt, connecting the other end of the short steel wire rope to one end of another wire rope via a connecting member with a length adjustment function, such as a turnbuckle (not shown), and fastening the other end of the other wire rope to any support column 2. This allows the tension of the support rope 42 to be adjusted to the optimal level. In addition to steel wire ropes, low-stretch fiber ropes can also be used for the support ropes 42.

[0036] Supporting means 4, such as support girders 41 and support cables 42, are designed to withstand the water pressure acting on the support columns 2 (waterproofing plates 3), and should be designed to have strength (bearing capacity) corresponding to the expected water pressure. Furthermore, the support girders 41 and support cables 42 do not necessarily need to be provided on all support columns 2. For example, support columns 2 arranged along the wall surface of the culvert P can be directly fixed to the wall surface of the culvert P. In other words, the fittings 43 for directly fixing to the wall surface of the culvert P can serve as the support means 4. In this case, any gaps between the wall surface of the conduit P and the support columns 2 positioned along the wall surface of the conduit P shall be sealed with a sealant such as quick-drying mortar as necessary. Furthermore, the support columns 2 installed along the wall surface of the conduit P may be custom-made so that their shape easily conforms to the shape of the conduit P's wall surface. This enhances watertightness and minimizes the amount of sealing material required.

[0037] The water-stopping plate 3 is inserted into the groove 21 of the support column 2, which is the holding mechanism 5, to form the partition wall W1 and the closing walls W2 and W3. Multiple plates are stacked between the same support columns 2 according to the expected water level and erected from the bottom of the pipe P.

[0038] In order to allow for flexible adaptation to the dimensions of the partition wall W1 and the closing walls W2 and W3 to be constructed, it is preferable to prepare multiple types of water-stopping plates 3 with different width dimensions, as shown in Figure 9. In this embodiment, water-stopping plates 3 with width dimensions of 2000 mm and 1000 mm are provided.

[0039] Furthermore, while the water-stopping plate 3 can be of various types as long as it can be securely held by the holding mechanism provided on the support column 2, a hollow structure having a through hole 31 extending in the width direction is preferably used. This reduces the weight during operation, while allowing water to flow from the temporary channel F into the through-hole 31 when installed, thus preventing the water-stopping plate 3 from floating up. This is being done to ensure stability. Furthermore, while the water-stopping plate 3 can be made of synthetic resin (including composite materials) or metal with strength (bearing capacity) corresponding to the expected water pressure, a pultruded FRP product (for example, "Pulfloor" (registered trademark) manufactured by Takiron CICI AG) can be suitably used. Furthermore, packings 32a and 32b made of chloroprene rubber or the like are provided on the surface facing the repair area D and the bottom surface of the end of the water-stopping plate 3, which is inserted into the groove 21 of the support column 2. The packings 32a and 32b are naturally pressed down by the water pressure of the flowing water in the temporary channel, the weight of the water-stopping plate 3 body, and the water flowing into the water-stopping plate 3, thereby providing water-stopping performance and preventing water from entering the repair area D.

[0040] Furthermore, the water-stopping plate 3 is equipped with a handle 33 to improve operability.

[0041] Next, we will explain the method of repairing pipes using this temporary wall. The pipe P will be repaired in the following steps, as shown in the process diagrams (1) in Figure 1 to (2) in Figure 2 and in Figures 6 to 7. The process involves fixing support columns 2 to the bottom of the culvert P at the location where the culvert P is to be repaired, while maintaining spacing with wedge-shaped scaffolding handrails 6, using support girders 41 and support cables 42. - A temporary wall is constructed by installing a water-stopping plate 3 between the support columns 2, thereby constructing a partition wall W1 and closing walls W2 and W3, and dividing the culvert P into a repair area D and a temporary channel F. As a result, repair area D is closed off and the water flow W will flow through the temporary channel F, so the following steps are then carried out. • A process to drain water accumulated in repair area D and dry out repair area D. • In repair area D, the process involves constructing a rehabilitation pipe R inside the culvert P and repairing the culvert P. In the process diagram (2) of Figure 2, the rehabilitation pipe R is constructed so as to extend at least beyond the range reached by the water level of the flowing water W when the closure of the repair area D is released, and the upper part which can be constructed even in the presence of the flowing water W is constructed in appropriate stages.

[0042] In this case, for example, to prevent unexpected events from occurring when water levels suddenly rise at night, the following steps may be included. - A step in which, at the end of a predetermined work period, for example, at the end of a workday, the water-stopping plates 3 that make up the closed walls W2 and W3 are removed, and the repair area D is placed under the flowing water W. • A step of installing the water-stopping plates 3 that make up the closed walls W2 and W3 before the start of the next work, for example, at the start of work the next day. • A process to drain water accumulated in repair area D and dry out repair area D. After completing the above steps, the renovation work can be resumed.

[0043] In the repair area D, a rehabilitation pipe R is constructed inside the culvert P. Once half of the culvert P has been repaired, the remaining half of the culvert P is repaired in the following steps, as shown in the process diagrams (3) in Figure 3 to (4) in Figure 4. The process involves, in the presence of flowing water W, fixing support columns 2 to the bottom of the culvert P (in the repaired section, the bottom of the repaired culvert P, i.e., the surface of the rehabilitated pipe R) using support means 4 such as support girders 41 and support ropes 42, while maintaining spacing with wedge-shaped scaffolding handrails 6. - A temporary wall is constructed by installing a water-stopping plate 3 between the support columns 2, thereby constructing a partition wall W1 and closing walls W2 and W3, and dividing the culvert P into a repair area D and a temporary channel F. As a result, repair area D is closed off and the water flow W will flow through the temporary channel F, so the following steps are then carried out. • A process to drain water accumulated in repair area D and dry out repair area D. In repair area D, the process involves constructing a rehabilitation pipe R inside the culvert P, continuous with the previously constructed rehabilitation pipe R, and then repairing the culvert P. In the process diagram (4) of Figure 4, the rehabilitation pipe R is constructed so as to extend at least beyond the range reached by the water level of the flowing water W when the closure of the repair area D is released, and the upper part which can be constructed even in the presence of the flowing water W is constructed in appropriate stages.

[0044] As a result, as shown in Figure 5, a rehabilitation pipe R can be constructed inside the culvert P, and the culvert P can be repaired. Although Figure 5 shows a partially completed rehabilitation pipe R, in reality, a standard scaffolding will be erected to construct the upper part of the rehabilitation pipe R, creating a rehabilitation pipe R that covers the entire circumference of the existing pipe, as shown in Figure 11(b).

[0045] The temporary wall and the method for repairing a conduit using the temporary wall of the present invention have been described above based on embodiments. However, the present invention is not limited to the configuration described in the above embodiments, and its configuration can be modified as appropriate without departing from the spirit of the invention. [Industrial applicability]

[0046] The temporary wall and the pipe repair method using the temporary wall of the present invention can be installed easily and quickly while also being able to withstand high water pressure. Therefore, it can be suitably used for applications such as temporary walls installed to divide a pipe into a repair area and a temporary channel during pipe repair, and pipe repair methods using the temporary wall, in order to prevent water from entering the repair area. [Explanation of symbols]

[0047] 1 Temporary wall 2 pillars 21 groove (retention mechanism) 3. Water stop plate 4 Support means 5 Retention mechanism 6. Wedge-type scaffolding handrail D Repair Area F temporary flow path P pipe culvert R rehabilitation pipe W running water W1 Partition wall W2 Closure Wall W3 Closure Wall

Claims

1. A temporary wall installed to divide the pipe into a repair area and a temporary channel during pipe repair, and to prevent water from entering the repair area, The temporary wall comprises a partition wall arranged along the longitudinal direction of the pipe and a closing wall that closes the opening of the repair area at the upstream and downstream ends of the partition wall. The partition wall and the closing wall are comprised of a plurality of support columns and a plurality of water-stopping plates. The support column is fixed to the bottom of the pipe by a support means and is equipped with a water-stopping plate holding mechanism. The water-stopping plate is erected from the bottom of the pipe by the holding mechanism, At least one of the support columns is fastened to the wall of the pipe on the temporary channel side by a support cable. A temporary wall characterized by the following features.

2. The temporary wall according to claim 1, characterized in that the support means includes a support girder with a truss structure fastened to both opposing walls of the conduit.

3. The temporary wall according to claim 1 or 2, characterized in that the water-stopping plate has a hollow structure with through holes extending in the width direction that allow water to flow in, and packings are provided on the repair area side surface and the bottom surface of the end of the water-stopping plate that is inserted into the groove of the support column.

4. A temporary wall installed to divide the pipe into a repair area and a temporary channel during pipe repair, and to prevent water from entering the repair area, The temporary wall comprises a partition wall arranged along the longitudinal direction of the pipe and a closing wall that closes the opening of the repair area at the upstream and downstream ends of the partition wall. The partition wall and the closing wall are comprised of a plurality of support columns and a plurality of water-stopping plates. The support column is fixed to the bottom of the conduit by a support means consisting of a truss structure support girder fastened to the opposing walls of the conduit, and is equipped with a water-stopping plate holding mechanism. The water-stopping plate has a hollow structure with through holes extending in the width direction that allow water to flow in, is erected from the bottom of the pipe by the holding mechanism, and has packing on the repair area side and bottom surface of the end of the water-stopping plate that is inserted into the groove of the support column. A temporary wall characterized by the following features.

Images