JP4014069B2 - Pipe repair method and pipe repair material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing an existing pipe line such as a sewer pipe line and a repair material used in the method, and in particular, repairs a large-diameter pipe having a diameter of 800 mm or more that allows a person to enter the pipe and work. It is related with the repair method and repair material of a pipe line suitable for.
[0002]
[Prior art]
For example, as a method of repairing a large-diameter pipe of a sewer without opening, conventionally, a strip-shaped profile made of vinyl chloride with a rib formed on one side is spirally wound in an existing pipe, and the pipe is supported from the inside. A method of injecting a backfilling material between the existing pipe and the profile with the materials assembled, or a slightly wider strip (strip) made of vinyl chloride is spirally wound in the pipe to the inner surface of the existing pipe In order to keep the injection pressure when injecting the backfilling material between the inner surface of the existing pipe and the hose for injecting the backfilling material on the upper surface of the existing pipe before winding the strip A method of attaching a spacer to form a space to pass through, or by drawing a polyethylene tube with a stud into an existing tube and applying water pressure in the tube at the time of backfilling material injection, A method in which to prevent deformation of the cube are known.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional pipeline repair method as described above, a support material is assembled at the time of injection of the backfilling material, water pressure is applied, or a spacer for passing the backfilling material injection hose in advance is provided. It takes a lot of labor and time, and the cost is huge.
[0004]
In addition, in all of the conventional pipe repair methods described above, the strength of the repair member itself is low, and the structure is such that the necessary strength is obtained by integration with the backfill material. There is a problem in that ribs need to be densely arranged on the surface of the member that is in contact with the backfill material, and the backfill material does not spread sufficiently due to the presence of the large number of ribs. Here, in order to solve the problem and to reduce the injection pressure of the backfill material, a fluidizing material is added to the backfill material, but there is a problem that the cost increases accordingly. is there. Furthermore, since the required strength is relied on the backfilling material side, the backfilling material is required to have a suitable strength, and as a result, the price is high. Furthermore, since the strength of the repair member itself is low, it is unsuitable for repair when the strength of the existing pipe is severely reduced.
[0005]
The present invention was made to solve the problems in the conventional method for repairing pipelines at once, and requires pressure-resistant measures such as forming a support when applying backfilling material and applying water pressure. In addition, the backfilling material can be sufficiently distributed between the existing pipe and the repair member without adding a fluidizing material, and the strength of the backfilling material can be made lower than before. Even when using cheap and inexpensive backfilling materials, it can be applied to existing pipes that are severely painful due to corrosion, etc., and it can be used to repair pipes that can sufficiently increase the strength of the pipe after repair. The purpose is to provide pipe repair materials suitable for the above.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the pipe repair method of the present invention provides a repair member capable of being carried in from a manhole as a cylindrical repair material along the inner peripheral surface of the existing pipe in the manhole or existing pipe. A method of repairing a pipe line that is assembled and inserted into an existing pipe and injecting a backfill material into the gap between the repair material and the existing pipe, wherein the repair member is an annular body that is substantially similar to the cross-sectional shape of the existing pipe Each of the long sides of the strip-like shape with respect to the cutout portion of the reinforcing member made of a highly rigid material having a shape divided into a plurality of portions in the circumferential direction and cutout portions formed at predetermined intervals on the inner circumferential side thereof A plurality of resin-made surface materials each having a substantially U-shaped cross section formed with protrusions protruding on one side along the portion, and the surface material protrusions are inserted so as to be adjacent to each other. and a reinforcing member made integral with each other and, the manhole or already A plurality of annular reinforcing members are integrated around a cylindrical body of a predetermined length formed by a plurality of strip-shaped surface materials by joining and integrating a plurality of the reinforcing members in the circumferential direction in the pipe. After assembling the cylindrical repair material and joining the repair materials in the axial direction to the repair target pipe length, the backfill material is injected between the repair material after joining and the existing pipe (Claim 1).
[0007]
The pipe repair material of the invention according to claims 2 to 4 is a repair material suitable for use in the inventive method according to claim 1, respectively, and the pipe repair material of the invention according to claim 2. Forms a protruding part facing inward at the tip of each protruding part on both sides of each surface material, while the notch part of each reinforcing member fits the protruding part and the protruding part of the tip It is characterized by being substantially T-shaped.
[0008]
Moreover, in the pipe line repair material of the invention which concerns on Claim 3, the characteristic structure containing the sealing member inserted between the mutually adjacent surface materials is employ | adopted.
[0009]
Further, the pipe repair material according to claim 4 is a ring formed by forming a plurality of through holes penetrating in the axial direction of the repair material in each arc-shaped reinforcement member, and joining and integrating these reinforcement members in the circumferential direction. These reinforcing materials are characterized by being configured to be joined and integrated in the axial direction via the respective through holes.
[0010]
The present invention eliminates the need to build a support or apply water pressure to prevent deformation of the repair member due to the pressure at the time of injection of the backfill material by giving the repair material itself sufficient strength, corrosion, etc. It is possible to give sufficient strength to existing painful pipes, and it is not necessary to densely arrange many ribs to obtain strength by integrating with backfilling material It is intended to facilitate the flow of the backfill material between the repair member and the existing pipe without adding a fluidizing material.
[0011]
That is, in the present invention, as a repair material arranged along the inner peripheral surface of the existing pipe, a strip-shaped resin surface material having a U-shaped cross section, and the outer peripheral side of the surface material, that is, the existing pipe inner surface side those constituted by the reinforcing member of high rigidity material which is integrated in the surface facing is used, the surface material and the reinforcing member is a possible shape and size carried from the manhole. Then, the reinforcing member has a shape obtained by dividing an annular body which is substantially similar to the cross-sectional shape of the existing pipe to be repaired in the circumferential direction, the annular body surrounding the tubular body comprising a plurality of surface material by joining and integrating Therefore, the strength of the repair material itself is greatly improved compared to the conventional one, and the strength of the repair material itself can sufficiently withstand the pressure at the time of injection of the backfilling material and cause no harmful deformation. And after the repair, it plays a role against external water pressure or earth pressure. Therefore, sufficient strength can be given even if it is used for existing pipes with severe corrosion without particularly increasing the strength of the backfill material. In addition, by increasing the strength of the repair material itself, it is not necessary to provide more ribs on the contact surface of the repair material with the backfill material so that it can be integrated with the backfill material. The flow is not hindered.
[0012]
Further, in the present invention, the high-strength repair material as described above is composed of a strip-shaped surface material and an arc-shaped reinforcing member, and these are carried from the manhole and assembled into a cylindrical shape in the manhole or existing pipe. Therefore, it is possible to construct a large-diameter pipe line without performing excavation.
[0013]
And as a pipeline repair material used for the above-mentioned method of the present invention, when the pipeline repair material of the invention according to claim 2 is used, the protruding portions on both sides of the surface material are respectively formed with projecting portions projecting inward. By forming the notch portions of the reinforcing member into a substantially T shape, each of the surface materials is removed from the reinforcing member when one of the protruding portions of the surface material adjacent to each other is inserted into one notch portion. It is difficult to detach, and the operation of assembling each surface material and the reinforcing member into a cylindrical shape as a whole becomes easy.
[0014]
Further, when a sealing member is interposed between adjacent surface materials as in the invention according to claim 3, the sealing property of the injection space of the backfilling material is improved, and the water-tightness of the surface material after repairing Can be improved.
[0015]
Furthermore, as in the invention according to claim 4, a plurality of through holes penetrating in the axial direction are formed in each arc-shaped reinforcing member, and the annular reinforcing members obtained by joining and integrating them in the circumferential direction are the above-mentioned When the through holes are integrated in the axial direction, the strength of the repair material is increased in both the radial direction and the axial direction, and the above-described operation and effect can be further ensured.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Here, the case where the pipe to be repaired has a circular cross section will be described.
[0017]
FIG. 1 is a partial cross-sectional view showing a state in which a plurality of repair material units used in a pipe line repair method to which the present invention is applied are joined together in an axial direction, and FIG. 2 is a cross-sectional view perpendicular to the axial direction. FIG.
[0018]
One unit of repair material in this example, that is, the repair material unit 1 has a cylindrical shape having a length L as a whole, and includes a plurality of, for example, about 48 surface members 11 made of resin, and each surface thereof. In a state in which the materials 11 are combined in a cylindrical shape, the reinforcing ring 12 is mainly composed of a plurality of reinforcing rings 12 arranged along the periphery thereof. Each reinforcing ring 12 includes three arc members 121 described later, It is assembled in a ring shape by joining and integrating with each other in the circumferential direction via a circumferential connecting fitting 122. Further, between each surface material 11, a water swelling rubber 11d for improving water tightness is inserted.
[0019]
The surface material 11 is made of, for example, high-density polyethylene. FIG. 3A shows a perspective view, and FIG. 3B shows an AA enlarged sectional view thereof. Protrusions 11a projecting to one side are formed along one long side part, and each projecting part 11a has a substantially U-shaped cross section with an overhanging part 11b projecting inward. Moreover, the recessed part 11c is formed in the outer side surface of each protrusion part 11a, and the above-mentioned water swelling rubber | gum 11d is interposed in the state fitted by each recessed part 11c of the surface material 11 of both sides.
[0020]
Each arc member 121 constituting each of the reinforcing rings 12 is a high-rigidity member using a steel material having a uniform thickness, and has an arc shape in which the circumference is divided into 1/3, respectively. ), A front view of the arc member 121, and a partial enlarged view of the arc member 121 are formed on the inner peripheral side of the arc at a predetermined interval and wide portions Wb are formed on the back side, as shown in FIG. A plurality of T-shaped notches 121a are formed, and through-holes 121b penetrating in the axial direction (thickness direction) are formed between the notches 121a. The reinforcing ring 12 is used, for example, for each of four respectively one accessory Osamu absorbent unit 1.
[0021]
As shown in FIG. 1, the structure in which the circular arc members 121 are joined and integrated in the circumferential direction to form the reinforcing rings 12, as shown in FIG. The metal fitting 122 and the arc members 121 on both sides thereof are integrally fastened with bolts and nuts in a state where the through holes formed in the metal plate and the positions of the through holes 121b of the arc members 121 on both sides of the metal fitting 122 are aligned. Is done. The circumferential connection fitting 122 is also formed with a notch into which the protruding portion 11a of the surface material 11 is fitted.
[0022]
Further, as shown in FIG. 2, the surface material 11 and the reinforcing ring 12 are integrated by inserting the protruding portions 11 a of the surface material 11 adjacent to each other into the notches 121 a formed in each arc member 121. At this time, the protruding portion 11b at the tip of each protruding portion 11a is fitted into the wide portion Wb formed on the back side of the notch portion 121a, so that each surface material 11 becomes the reinforcing ring 12. Can be prevented from being separated by its own weight or the like.
[0023]
In the repairing material unit 1, the reinforcing rings 12 are joined to each other in the axial direction with a pipe-shaped spacer 123 interposed between the reinforcing rings 12 as shown in FIG. A shaft 124 having male threads formed at both ends is inserted so as to penetrate both the spacer 123 and the through hole 121b of each arc member 121, and a nut 125 is fastened to each male thread.
[0024]
Then, the joining and integration of the repairing material units 1 in the axial direction is performed by bringing both end surfaces of the surface materials 11 of the repairing units 1 adjacent to each other into contact with each other as shown in the circumferential sectional view of FIG. The resin ring 111 divided into three in the circumferential direction is fitted so as to straddle the contact portion, and the circumferential direction of the resin ring 111 is fitted with the resin ring 112. As the fitting means, the protrusions 111a provided at both ends of the resin ring 111 are passed through the holes 112a provided at both ends of the resin ring 112, and the tip of the protrusion 111a is crushed with an appropriate jig so that it cannot be removed. What should I do? In addition, male screws are provided at both ends so that the reinforcing rings 12 of the repairing unit 1 in contact with each other pass through the through holes 121b and the spacers 126 of the reinforcing rings 12 with the pipe-shaped spacers 126 interposed therebetween. This is done by inserting the formed shaft 1127 and fastening a nut 128 to each male screw. The resin ring 111 is not limited to the above-described structure, and a resin ring having a structure illustrated in FIGS. 7A to 7C may be used.
[0025]
Now, the surface material 11 and the arc-shaped member 121, etc., which are parts constituting the repair material unit 1 described above, for example, when the pipe to be repaired has a first person hole (manhole), its straight portion In order to carry in, only the lid portion of the manhole is expanded as necessary. Further, the parts constituting the repair material unit 1 do not need to be individually carried into a manhole or an existing pipe line, but can be suitably assembled so as to pass through the straight portion of the manhole. . That is, for example, as shown in a schematic perspective view in FIG. 8, the surface material 11 is integrated in a state where the arc-shaped member 121 is not joined in the circumferential direction. May be.
[0026]
Each of these parts or sub-assemblies is carried into a manhole, and then assembled into a cylindrical repair material unit 1 having a length L in the manhole or existing pipe, and the repair material unit 1 is further moved in the axial direction. It joins and it is in the state of FIG. Further, in this embodiment, the assembling of the repair site unit 1 and the joining operation in the axial direction are performed in the sewer isolation region by inserting the sewage isolation device into the existing pipe to form a region where the sewage does not flow. . The specific method will be described below.
[0027]
FIG. 9 shows that the sewage isolation device 2 is inserted into the existing pipe P, and the cylindrical repair member unit 1 is assembled using parts such as the surface material 11 and the arcuate member 121 in the sewage isolation region formed around the pipe. FIG. 10 is a cross-sectional view taken along the line AA.
[0028]
The sewage isolation device 2 includes a water stop plug 21 in which an outer seal 21b and an inner seal 21c are provided on a cylindrical main body 21a, and a sewage isolation cylinder attached to a downstream end surface portion of the cylindrical main body 21a of the water stop plug 21. The body 22 is the main constituent.
[0029]
Each of the outer seal 21b and the inner seal 21c is a seal that expands by supplying air from the outside, and the outer seal 21b is configured by a plurality of donut-shaped hoses provided along the outer periphery of the cylindrical main body 21a. By inflating by supplying air, it abuts against the inner surface of the existing pipe P in a watertight manner. The inner seal 21c is a bag-like body whose periphery is airtightly fixed to the inner surface of the cylindrical main body 21a. By supplying air and inflating, the inner space of the cylindrical main body 21a is sealed watertight. Can do.
[0030]
The sewage isolation cylinder 22 is attached to the water stop plug 21 in the existing pipe P. The attachment work is performed in a state where air is supplied to the outer seal 21b and the inner seal 21c of the water stop plug 21 to temporarily stop the flow of sewage in the existing pipe P, and the sewage can be touched in the work. Absent. After the sewage isolation cylinder 22 is attached, the air in the inner seal 21c is discharged. Thus, the sewage that has flowed through the existing pipe P flows through the cylindrical main body 21a of the water stop plug 21 and the sewage isolation cylinder 22, and the sewage does not flow around the sewage isolation cylinder 22. That is, a sewer isolation region is formed.
[0031]
As shown in FIG. 9, the sewage separator 2 as described above is arranged so that the water stop plug 21 is located in the existing pipe P in the vicinity of the manhole H located on the upstream side of the pipe to be repaired. The surface material 11 and the circular arc member 121 and the like constituting the repair material unit 1 are sequentially carried into the manhole H with the sewage isolation cylinder 22 mounted so as to be positioned at the invert portion of the manhole H. Then, the protrusion 11a of each surface material 11 is inserted into the notch 121a of the arc member 121, and the arc members 121 are joined and integrated in the circumferential direction to be assembled into the reinforcing ring 12, thereby forming a cylindrical shape as a whole. around the assembled surface material 11, thereby completing the cylindrical auxiliary Osamu absorbent unit 1 in which a plurality of reinforcing rings 12, which are integrally made of a material of high rigidity. When complete one repair material unit 1, the complement Osamuzai unit 1 is moved to the downstream side of the existing pipe P, assembling the next repair material unit 1 by the same procedure as described above, the auxiliary Osamuzai assembled earlier The unit 1 is joined in the axial direction. In addition, when assembling repair material unit 1 and moving it downstream, as shown in FIG. 9, it is good to pull with the wire 3 from the downstream.
[0032]
When the joined body of the repair material unit 1 having a length equal to the length of the pipe to be repaired is obtained by the above work, for example, a wife mold is attached to both ends thereof, and the outer peripheral surface of each repair material unit 1 and the existing pipe A back-filling material such as mortar is injected between the inner peripheral surface of P. After the injection of the backfilling material, the protruding portion 11a of each surface material 11 also serves as a rib for integration with the backfilling material.
[0033]
Of particular note in the above method is that each repair material unit 1 assembled in a cylindrical shape within the manhole H and the existing pipe P leading to it has a plurality of reinforcements made of a high-rigidity material such as steel along its outer periphery. Since the ring 12 has an integrated structure, the strength of the ring 12 is high, and it can sufficiently withstand the injection pressure of the backfill material. A method for withstanding pressure against the backfilling material injection pressure such as applying water pressure is not required. In addition, since the strength of the repair material unit 1 itself is high, even if the strength of the existing pipe P is weakened due to corrosion or the like, it is possible to provide sufficient strength by repair, and high strength as a backfilling material. In addition, the ribs provided in the repair material for integration with the backfill material, and in the above embodiment, the density of the protrusions 11a is sparse compared to the conventional one. As a result, the backfilling material can be sufficiently distributed between the repair material and the existing pipe P without adding a fluidizing material to the backfilling material.
[0034]
Moreover, when the construction method using the sewage isolation device 2 is employed as in the above embodiment, the work for assembling the repair material unit 1 and joining in the axial direction can be performed in the sewage isolation region. Since it is not necessary to stop the flow of sewage through the assembling work, it is possible to carry out the work without danger even for a sewer having a high flow rate or a sewer having a fast flow.
[0035]
The present invention is limited to the above-described embodiment with respect to the number of the surface materials 11 forming the repair material unit 1, the number of divisions of the reinforcing ring 12, the joining structure in the axial direction of the repair material units 1 and the like. Of course, other numbers or structures may be employed.
[0036]
In the above embodiment, the case where the existing pipe has a circular cross section has been described. However, the present invention can be equally applied to, for example, a rectangular saddle (box culvert) or a horseshoe-shaped saddle (arch culvert). In that case, the repairing material unit is a member obtained by appropriately dividing the annular body similar to the above-mentioned cross-sectional shape by replacing the reinforcing ring with the arc member so that the repair material unit has a shape corresponding to the cross-sectional shape of the pipe rod by assembly. In addition, as for the surface material, for example, when applied to a rectangular ridge, a material having a cross-sectional shape different from that of the others may be used at the corner portion.
[0037]
[Effect of the invention]
As described above, according to the present invention, in a pipe line repair method in which a repair material is arranged substantially along an inner surface of an existing pipe and a backfill material is injected between the repair material and the existing pipe. As a whole, a strip-like shape, a plurality of surface materials each having a substantially U-shaped cross-section formed with a protruding portion projecting to one side along each long piece, and an annular body having a cross-sectional shape of a pipeline to be repaired It consists mainly of a reinforcing member with a shape divided into a plurality in the circumferential direction, with a notch formed on its inner periphery, and these are in the manhole and existing pipes that lead to it, with respect to each notch of the reinforcing member By inserting protrusions of adjacent surface materials into each other and integrating each other, and integrating each reinforcing member in the circumferential direction, a cylindrical body of a predetermined length made of a plurality of strip-shaped surface materials Cylindrical repair material in which a plurality of annular reinforcing materials are integrated around As the assembly and the required lengths are sequentially joined in the axial direction, the strength of the repair material itself is significantly higher than that of conventional pipe repair methods, and the injection pressure of the backfill material itself Thus, it is not necessary to construct a support as in the conventional construction method or to apply a water pressure from the inside, and the construction cost can be greatly reduced.
[0038]
In addition, even when applied to the repair of existing pipes whose strength has been significantly reduced due to corrosion, etc., due to the increase in strength of the repair material, it is possible to give sufficient strength without using a particularly high strength backfill material. In addition, since there is no need to densely arrange a large number of ribs to obtain strength by integrating with the backfill material as in the past, the use of the backfill material without using a backfill material with the addition of a fluidizing material. The filling degree can be increased, and an inexpensive material can be selected as the backfilling material.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing a state in which a plurality of repair material units 1 used in an embodiment of the present invention are joined in an axial direction.
FIG. 2 is an enlarged cross-sectional view of a main part taken along an axis orthogonal plane in FIG.
3 is an explanatory view of a surface material 11 used in the repair material unit 1 of FIG. 1, in which (A) is a perspective view and (B) is an AA enlarged sectional view thereof. FIG.
4 is an explanatory view of an arc member 121 used in the repair material unit 1 of FIG. 1, in which (A) is a front view and (B) is a partially enlarged view thereof.
FIG. 5 is an axial parallel cross-sectional view of a repair material unit 1;
6 is a cross-sectional view in the circumferential direction of a main part of the repair material unit 1. FIG.
7A to 7C are cross-sectional views showing other structural examples of the surface material 11 and the resin ring 111 of the repair material unit 1 that can be used in the method of the present invention, respectively.
FIG. 8 is a schematic perspective view showing a state in which the surface material 11 is assembled without joining the arc member 121 of the repairing material unit 1 in the circumferential direction.
FIG. 9 is a schematic cross-sectional view showing a state where a sewage separator 2 is inserted into an existing pipe P in a pipe line repair method to which the present invention is applied.
10 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Repair material unit 11 Surface material 11a Protrusion part 11b Overhang | projection part 12 Reinforcement ring 121 Arc member 121a Notch part 121b Through-hole 122 Circumferential connection metal fitting 123, 126 Spacer 124, 127 Shaft 125, 128 Nut 2 Sewer isolation device 21 Stop Water plug 21a Tubular body 21b Outer seal 21c Inner seal 22 Sewage isolation cylinder H Manhole P Existing pipe

Claims (4)

A repair member that can be carried in from the manhole is assembled into a cylindrical repair material along the inner peripheral surface of the existing pipe in the manhole or existing pipe, inserted into the existing pipe, and the gap between the repair material and the existing pipe is inserted. A method of repairing a pipeline for injecting backfill material,
The repair member is a highly rigid material having a shape obtained by dividing an annular body substantially similar to the cross-sectional shape of an existing pipe into a plurality of parts in the circumferential direction, and notches are formed at predetermined intervals on the inner circumference side thereof. A plurality of surface materials made of resin having a substantially U-shaped cross section, each having a protruding portion that protrudes to one side along each of the long side portions of the strip shape, are adjacent to the notch portion of the reinforcing member to as the projection of the surface material is inserted respectively becomes to integrate the reinforcing member with the respective surface materials to each other,
In the manhole or existing pipe, a plurality of the reinforcing members are joined and integrated in the circumferential direction, whereby a plurality of annular reinforcements are formed around a cylindrical body having a predetermined length formed by a plurality of strip-shaped surface materials. After assembling a cylindrical repair material with integrated materials and joining the repair materials in the axial direction to the repair target pipe length, the back of the joint between the repair material after joining and the existing pipe A method of repairing a conduit characterized by injecting a filling material. It is a repair material used for the repair method of the pipe line of Claim 1, Comprising: The overhang | projection part which faces inward is formed in each front-end | tip of each protrusion part of each said surface material, Each said reinforcement member The notch portion has a substantially T-shape so that the protruding portion and the overhang portion at the tip thereof are fitted with each other. A repair material for use in the method of repairing a pipe according to claim 1, conduit repair material, characterized in it to contain a sealing member inserted between said surface material adjacent to each other. It is a repair material used for the repair method of the pipe line of Claim 1, Comprising: The said each reinforcing member is formed with the some through-hole penetrated to a repair material axial direction, These each reinforcing member is made into the circumferential direction. A pipe line repair material, characterized in that the annular reinforcing materials obtained by joining and integration are joined and integrated in the axial direction through the respective through holes.

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