Rehabilitation Structure of Existing Culvert

Abstract

To provide a renovation structure for an existing covered conduit preventing a renovation pipe from floating up through buoyancy by residence of water having intruded around the renovation pipe of the existing covered conduit with locations where water intrudes from a surrounding ground through a wall constituted with masonry and concrete and the like, and preventing outflow of the surrounding ground causing depression accidents.SOLUTION: A renovation structure for an existing covered conduit is provided with: a renovation pipe 2 forming a conduit therein; a filling material 3 filled and cured between the renovation pipe 2 and an existing covered conduit 1; a surface-shaped material 4 placed on a boundary between the filling material 3 and a side wall 11 of the existing covered conduit 1; and a water guide pipe 5 provided on a boundary between the surface-shaped material 4 and the existing covered conduit 1 in a pipe axial direction of the renovation pipe 2 to which water intruding from a surrounding ground through the side wall 11 of the existing conduit 1 is introduced.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rehabilitation structure for an existing culvert where water infiltrates from the surrounding ground through a wall portion made of masonry, concrete, or the like.

Background Art

[0002] Conventionally, for example, in urban areas, canals (waterways) constructed of masonry, concrete, or the like have been used for a long time. Some of these canals were originally open canals, and their upper parts have been covered to form culverts for use as roads or the like due to urban development or the like. However, deterioration due to the collapse or cracking of masonry or concrete has progressed, and the function and strength as a canal are no longer guaranteed.

[0003] As countermeasures against this, there are a method of renewing the existing culvert and a method of rehabilitating it. The method of renewing the existing culvert requires the existing culvert to be removed once, which is extremely labor-intensive and costly, and also affects citizens' lives due to large-scale traffic restrictions and the like. Therefore, a method of rehabilitating the existing culvert in the culvert state without the above problems has been demanded.

[0004] By the way, as a method of rehabilitating an existing canal or an existing culvert, a method using a rehabilitation pipe made of a thermoplastic resin or a thermosetting resin has been proposed (see, for example, Patent Documents 1 and 2). Although the methods disclosed in Patent Documents 1 and 2 can achieve the purpose of rehabilitating the existing canal to some extent, it has been difficult to guarantee the strength of the existing culvert with a reduced strength for using the ground surface as a road or the like because a large improvement in the strength of the culvert cannot be expected depending on the rehabilitation pipe itself. In the case of an existing culvert, there may be a place where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc. However, in the methods disclosed in Patent Documents 1 and 2, the water that infiltrates around the rehabilitation pipe may accumulate, causing buoyancy on the rehabilitation pipe and resulting in the pipe floating up, or the surrounding ground (soil) may flow out, leading to a subsidence accident.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the problems of the conventional method of rehabilitating an existing culvert in the state of a culvert, the present invention provides a rehabilitation structure for an existing culvert in which there is a place where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc., and the water that infiltrates around the rehabilitation pipe of the existing culvert does not accumulate, causing buoyancy on the rehabilitation pipe and resulting in the pipe floating up, or the surrounding ground does not flow out, leading to a subsidence accident. This is the first object.

[0007] Further, the present invention provides a rehabilitation structure for an existing culvert that can ensure the strength of an existing culvert whose ground surface has been reduced in strength for use as a road or the like by means of a rehabilitation pipe. This is the second object. To do.

Means for Solving the Problems

[0008] To achieve the above first object, the rehabilitation structure of the existing culvert of the present invention is A rehabilitation pipe that forms a water channel inside, a filler material that is filled and hardened between the rehabilitation pipe and the existing culvert; a water guide pipe that is provided in the axial direction of the rehabilitation pipe at the boundary between the filler material and the existing culvert, and through which water that has infiltrated from the surrounding ground through the wall of the existing culvert is introduced and is characterized by comprising the same.

[0009] Further, a planar member may be provided at the boundary between the filler material and at least the side wall of the existing culvert, so that water that has infiltrated from the surrounding ground along the planar member is introduced into the water guide pipe.

[0010] Furthermore, in order to achieve the above second object, the rehabilitation pipe includes an annular fixing member that also serves as a first reinforcing member provided at intervals in the axial direction of the rehabilitation pipe along the inner peripheral surface of the existing culvert, a connecting member disposed on the fixing member, and a belt-shaped inner surface member that is installed between the connecting member and a connecting member disposed on a fixing member adjacent in the axial direction of the rehabilitation pipe.

[0011] Also, the rehabilitation pipe can be provided with a second reinforcing member annularly provided on the outer peripheral side of the fixing member.

Advantages of the Invention

[0012] According to the existing culvert rehabilitation structure of the present invention, by providing a water guide pipe that is provided in the axial direction of the rehabilitation pipe at the boundary between the filler material and the existing culvert and through which water that has infiltrated from the surrounding ground through the wall of the existing culvert is introduced, water that has infiltrated around the rehabilitation pipe of the existing culvert where there is a location where water infiltrates from the surrounding ground through a wall portion made of stone masonry, concrete, or the like is discharged through the water guide pipe, so that the water that has infiltrated around the rehabilitation pipe does not stagnate, and it is possible to prevent the rehabilitation pipe from being buoyed up by buoyancy or the surrounding ground from flowing out and causing a subsidence accident.

[0013] Further, a planar member is provided at the boundary between the filling material and at least the side wall portion of the existing culvert, so that water infiltrating from the surrounding ground along the planar member is introduced into the water conduit, thereby enabling more reliable discharge of the water infiltrating from the surrounding ground through the water conduit.

[0014] In addition, the rehabilitation pipe includes an annular fixing member that also serves as a first reinforcing member installed at intervals in the pipe axis direction of the rehabilitation pipe along the inner peripheral surface of the existing culvert, a connecting member disposed on the fixing member, the connecting member, and a strip-shaped inner surface member installed on the connecting member and the connecting member disposed on the fixing member adjacent in the pipe axis direction of the rehabilitation pipe. By doing so, the strength of the existing culvert whose strength has decreased when the ground surface is used as a road or the like can be ensured by the rehabilitation pipe and the filling material having the annular fixing member that also serves as the first reinforcing member.

[0015] In addition, by configuring the rehabilitation pipe to include a second reinforcing member annularly provided on the outer peripheral side of the fixing member, the strength of the existing culvert with reduced strength can be more reliably ensured.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the rehabilitation structure of the existing culvert of the present invention will be described with reference to the drawings.

[0018] FIG. 1 shows an embodiment of the rehabilitation structure of the existing culvert of the present invention. This existing culvert rehabilitation structure is for rehabilitating the existing culvert 1 where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc. It includes a rehabilitation pipe 2 that forms a water channel inside, a filling material 3 that is filled and hardened between the rehabilitation pipe 2 and the existing culvert 1, a planar member 4 provided at the boundary between the filling material 3 and the side wall portion 11 of the existing culvert 1, and a water guide pipe 5 provided in the axial direction of the rehabilitation pipe 2 at the boundary between the filling material 3 (or the planar member 4 if the planar member 4 is provided) and the existing culvert 1, through which water infiltrating from the surrounding ground through the side wall portion 11 of the existing culvert 1 is introduced.

[0019] By the way, the existing culvert 1 targeted in this embodiment has a side wall portion 11 made of stone masonry, a bottom portion 12 made of concrete, and a concrete floor slab supported by PC girders on the top surface portion 13, respectively. However, the existing culvert rehabilitation structure of the present invention is not limited to this, and widely targets existing culverts where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc.

[0020] For the rehabilitation pipe 2, a known rehabilitation pipe used for rehabilitating existing pipes such as aging sewer pipes can be diverted. In this embodiment, however, the rehabilitation pipe described in FIG. 3 (FFT Method Association's "String Method" (registered trademark)) (see Patent Documents 3 and 4) is diverted.

[0021] Specifically, the rehabilitation pipe 2 includes an annular fixing member 21 that also serves as a first reinforcing member made of deformed steel bars installed at intervals in the axial direction of the rehabilitation pipe 2 along the inner peripheral surface of the existing culvert 1, a connecting member 22 disposed on the fixing member 21, a connecting member 22, and a strip-shaped inner surface material 23 made of synthetic resin such as high-density polyethylene that is installed on the connecting member 22 disposed on the fixing member 21 adjacent in the axial direction of the rehabilitation pipe 2 via a spacer that defines the interval. It also includes a fastener 24 made of synthetic resin such as high-density polyethylene - thermoplastic elastomer that connects adjacent inner surface materials 23 to cover the gap. Further, in this embodiment, a second reinforcing member 25 made of deformed steel bars annularly provided on the outer peripheral side of the fixing member 21 is provided. Here, between adjacent fixing members 21, between adjacent second reinforcing members 25, and between the fixing member 21 and the second reinforcing member 25 provided annularly on the outer peripheral side thereof, reinforcing bars 26a and 26b are disposed as required. The size (diameter), arrangement, and placement thickness of the filling material 3 of the fixing member 21 that also serves as the first reinforcing member, the second reinforcing member 25, and the reinforcing bars 26a and 26b are designed so that the strength of the existing culvert 1 with reduced strength can be ensured. In particular, for the existing culvert 1 composed of masonry, since it is difficult to consider bearing capacity, the structure is designed using the rehabilitation pipe 2 and the filling material 3. Thus, the strength of the existing culvert 1 with reduced strength, whose ground surface is used as a road or the like, can be ensured by the rehabilitation pipe 2 and the filling material 3 having the annular fixing member 21 that also serves as the first reinforcing member and further the second reinforcing member 25.

[0022] For the filling material 3, highly fluid and high-strength mortar can be preferably used.

[0023] In this embodiment, the planar member 4 guides and introduces the water infiltrated from the surrounding ground through the side wall portion 11 of the existing culvert 1 composed of masonry into the water conduit 5, and at the same time, to prevent the placed filling material 3 having fluidity from leaking to the existing culvert 1 side, it is provided only at the boundary between the filling material 3 and the side wall portion 11 of the existing culvert 1 (in the modified embodiment shown in FIG. 2, only at the boundary between the filling material 3 and the side wall portion 11 of the existing culvert 1 composed of masonry), but depending on the structure of the existing culvert 1, it can also be provided on the bottom portion 12 and the top surface portion 13. For the planar member 4, in addition to a water barrier sheet made of synthetic resin such as polyethylene or polyvinyl chloride (for example, “Vinon” (registered trademark) manufactured by Takiron Sheet Eye Co., Ltd.) having a function capable of achieving the above object, an embossed drainage and protection mat (for example, “GeoFlow” (registered trademark) manufactured by Takiron Sheet Eye Civil Co., Ltd.), a planar drainage material (for example, “GlySheet” (trade name) manufactured by Takiron Sheet Eye Civil Co., Ltd.), and other planar members having water barrier properties and water conductivity can be used.

[0024] ​

[0025] The water conduit 5 is for introducing water that has seeped in from the surrounding ground through the side wall portion 11 of the existing culvert 1, and for introducing the introduced water to the outside for drainage, for example, introducing it into a water channel formed inside the rehabilitation pipe 2 at an appropriate location. It is laid at the lowermost position of the side wall portion 11 of the existing culvert 1 composed of stone masonry (or when multiple are provided, at the lowermost position, upper position, or intermediate position of the side wall portion 11 of the existing culvert 1) at a location that does not affect the strength of the rehabilitation pipe 2 and the filling material 3 at the boundary between the filling material 3 (or the planar member 4 when the planar member 4 is provided) and the existing culvert 1.

[0026] For the water conduit 5, a perforated pipe or mesh pipe made of synthetic resin such as polyethylene, which has a function capable of achieving the above object, can be used (for example, the drainage and external pressure pipe "Super Pipe W type" (trade name) manufactured by Takiron Shia Shivil Co., Ltd., the culvert drainage pipe "Double Drain" (trade name), etc.).

[0027] According to this rehabilitation structure of the existing culvert, by providing a water conduit 5 through which water seeping in from the surrounding ground through the side wall portion 11 of the existing culvert 1 is introduced, provided in the pipe axis direction of the rehabilitation pipe 2 at the boundary between the filling material 3 (or the planar member 4 when the planar member 4 is provided) and the existing culvert 1, the water that has seeped into the surroundings of the rehabilitation pipe 2 of the existing culvert 1 where there are locations where water seeps in from the surrounding ground through a wall portion composed of stone masonry, concrete, etc. is discharged through the water conduit 5, so that the water that has seeped into the surroundings of the rehabilitation pipe 2 does not stagnate, and it is possible to prevent the rehabilitation pipe 2 from being buoyed up by buoyancy or the surrounding ground from flowing out and causing a subsidence accident. And since this rehabilitation structure of the existing culvert can be constructed without excavating the existing culvert 1, it is possible to reduce costs and shorten the construction period, and minimize the impact on the surroundings.

[0028] As described above, the rehabilitation structure of the existing culvert of the present invention has been described based on its embodiments, but the present invention is not limited to the configurations described in the above embodiments, and its configuration can be appropriately changed within the scope not departing from the gist thereof.

Industrial Applicability

[0029] The rehabilitation structure of the existing culvert of the present invention is such that water stagnates around the rehabilitation pipe of the existing culvert where there are locations where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc., and the rehabilitation pipe is not buoyed up due to buoyancy or cause a subsidence accident due to the outflow of the surrounding ground. Also, since the rehabilitation pipe can ensure the strength of the existing culvert whose strength has decreased when the ground surface is used as a road or the like, it can be suitably used for the rehabilitation of existing culverts where there are locations where water infiltrates from the surrounding ground through a wall portion composed of stone masonry, concrete, etc.

Explanation of Reference Numerals

[0030] 1 Existing culvert 11 Side wall portion 12 Bottom 13 Top surface portion 2 Rehabilitation pipe 21 Fixing member (first reinforcing member) 22 Connecting member 23 Inner surface material 24 Fastener 25 Second reinforcing member 26a Reinforcing bar 26b Reinforcing bar 3 Filling material 4 Sheet-like member 5 Water conduit

Claims

Claim 1 A rehabilitation structure for an existing culvert, comprising: a rehabilitation pipe that forms a waterway inside; a filling material that is filled and hardened between the rehabilitation pipe and the existing culvert; a planar member provided at the boundary between the filling material and at least the side wall of the existing culvert, having a water-blocking property to prevent the placed filling material from leaking to the existing culvert side and a water-conducting property to guide water infiltrated from the surrounding ground; and a water conduit provided in the pipe axis direction of the rehabilitation pipe at the boundary between the planar member and the existing culvert, through which water infiltrated from the surrounding ground through the wall of the existing culvert is introduced along the planar member. The rehabilitation structure for an existing culvert is characterized by the above. Claim 2 The rehabilitation structure for an existing culvert according to claim 1, wherein the rehabilitation pipe comprises an annular fixing member that also serves as a first reinforcing member made of deformed steel bars installed at intervals in the pipe axis direction along the inner peripheral surface of the existing culvert, a connecting member disposed on the fixing member, and a strip-shaped inner surface member installed between the connecting member and a connecting member disposed on a fixing member adjacent to the rehabilitation pipe in the pipe axis direction. Claim 3 The rehabilitation structure for an existing culvert according to claim 2, wherein the rehabilitation pipe comprises a second reinforcing member made of deformed steel bars provided annularly on the outer peripheral side of the fixing member, and a reinforcing bar disposed between the fixing member and the second reinforcing member.

Images