Reconstruction method of sewerage facility

Abstract

To reduce costs required for a reconstruction work of a sewerage facility while preventing deterioration in construction efficiency.SOLUTION: A reconstruction method of a sewerage facility comprises: inserting a cylindrical corrosion-resistant sheet 3 made of synthetic resin into an internal space of the sewerage facility; pressing and holding the corrosion-resistant sheet 3 against an inner wall 200 that constitutes the internal space of the sewerage facility with a thin steel plate (a base plate portion 42) having synthetic resin (an outer plate portion 43) attached to its outer surface; and filling a backfill material 5 between the inner wall 200 of the sewerage facility and an outer surface of the corrosion-resistant sheet 3. A thickness of the corrosion-resistant sheet 3 can be 1.4 mm to 3.0 mm, a thickness of the thin steel plate (the base plate portion 42) can be 1.0 mm to 4.0 mm, and a thickness of the synthetic resin (the outer plate portion 43) attached to the outer surface of the thin steel plate (the base plate portion 42) can be 2.0 mm to 6.0 mm.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for reconstructing a manhole or the like by attaching a synthetic resin sheet to the inner wall of a manhole or the like in sewer facilities.

Background Art

[0002] Concrete manholes are installed in the sewer pipeline network. When the manhole is used for many years, corrosion parts will occur on the inner wall due to corrosion by hydrogen sulfide gas and aging deterioration. If this is left unattended, cracks will occur in the corrosion parts due to the earth pressure from the surroundings, leading to the risk of leakage accidents and collapse accidents.

[0003] Therefore, in Patent Document 1, the applicant proposed a jig for attaching a synthetic resin sheet to the inner wall of a manhole or the like in sewer facilities, which is formed of a synthetic resin material or the like, and has high construction efficiency, excellent mechanical strength, light weight, and can achieve cost reduction, such as a jig for reconstruction work.

[0004] As shown in FIG. 2(b), the above-mentioned reconstruction work jig 10 is composed of a rigid inner frame portion 11, a substrate portion 12 made of an elastic synthetic resin such as FRP, and an outer plate portion 13 made of a synthetic resin such as foamed resin.

[0005] Further, the curved edge 111 constituting the inner frame portion 11 is curved in an arc shape and combined into a cylindrical shape along the inner wall 200 of the manhole, and the adjacent non-curved edges 112 are connected by the first and second connecting portions 115 and 116 to form a cylindrical jig assembly 1 as shown in FIG. 2(a).

[0006] After installing the anticorrosion sheet 3 into the manhole 2 using the jig assembly 1 or the like, the gap G between the inner wall 200 of the manhole and the outer surface 31 of the anticorrosion sheet 3, and the uneven surface 201 after removing the corrosion part are filled with a backfill material 5 such as concrete, and the work at the bottom block 23 is completed. The same work as above is also performed for the inclined wall block 21 and the straight wall block 22, and the reconstruction work of the entire manhole 2 is completed.

[0007] According to the jig 10 for reconstruction work, the inner frame portion 11 having rigidity withstands the filling pressure F of the backfill material 5 to avoid misalignment of the anticorrosion sheet 3. By making the substrate portion 12 and the outer plate portion 13 of synthetic resin, the weight is reduced, making it easier to handle during transportation at the construction site or during assembly in a narrow manhole 2, etc., and improving the construction efficiency.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] The jig 10 for reconstruction work described in the above Patent Document 1 functions effectively. However, since the substrate portion 12 constituting the jig 10 is made of synthetic resin such as FRP, the manufacturing cost of the jig 10 becomes high, and accordingly, there is a problem that the cost required for the reconstruction work becomes high.

[0010] Therefore, an object of the present invention is to reduce the cost required for the reconstruction work of sewer facilities while preventing deterioration of construction efficiency.

Means for Solving the Problems

[0011] To achieve the above object, the present invention is a method for reconstructing sewer facilities, comprising inserting a cylindrical anticorrosion sheet made of synthetic resin into the internal space of the sewer facilities, pressing and holding the anticorrosion sheet against the inner wall constituting the internal space of the sewer facilities with a thin steel plate having synthetic resin adhered to its outer surface, and filling a backfill material between the inner wall of the sewer facilities and the outer surface of the anticorrosion sheet.

Effects of the Invention

[0012] According to the present invention, by forming the anticorrosion sheet thicker than before, it becomes possible to press and hold the anticorrosion sheet with a thin steel plate instead of the conventional expensive synthetic resin material, preventing the deterioration of construction efficiency and reducing the cost required for reconstruction work.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0014] Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

[0015] FIG. 1 shows an example of a jig assembly used in the method for reconstructing a sewer facility according to the present invention, and this jig assembly 4 corresponds to the conventional jig assembly 1.

[0016] As shown in FIG. 1(a), the jig assembly 4 is formed by five jigs 41 (41A to 41E, and these may be collectively referred to as "41" in some cases). At the non-curved ends 54 and 55 between the adjacent jigs 41A and 41E, as shown in FIGS. 1(a) and (b), fitting members 46 and 47 and tightening members 48 and 49 that constitute a wedge portion for adjusting the outer diameter of the jig assembly 4 are arranged. The details of the configurations of the fitting members 46 and 47 and the tightening members 48 and 49 and the handling procedures are the same as those described in Patent Document 1.

[0017] The jigs 41 (41A to 41E) have the same basic configuration. 41B to 41D have the same shape, and 41A and 41E are formed symmetrically with respect to each other. Each jig 41 is lifted using the suspension hole 51, the position of the adjacent jig 41 is adjusted using the insertion pin 45, and the adjacent non-curved end portions 53 are connected by bolts 44 to form the jig assembly 4.

[0018] Since the jigs 41 have the same basic configuration, the configuration of the jig 41B will be described in detail below. The jig 41B includes a rigid inner frame portion (not shown, corresponding to the conventional inner frame portion 11), a substrate portion 42 made of a thin steel plate (corresponding to the conventional substrate portion 12), an outer plate portion 43 made of a synthetic resin such as foamed resin (corresponding to the conventional outer plate portion 13), an upper curved end portion 50, a lower curved end portion 52, a non-curved end portion 53, and the like. It is a feature of the present invention that the substrate portion 42 is formed of a thin steel plate.

[0019] The thickness of the conventional anticorrosion sheet 3 was about 1 mm or less, but in the present invention, the thickness of the anticorrosion sheet 3 was doubled to be about 1.4 mm or more and 3.0 mm or less, and by increasing the strength of the anticorrosion sheet 3, the substrate portion 42 could be formed of a thin steel plate. The conventional outer plate portion 13 was formed of a synthetic resin material and had a thickness of about 3 mm. However, by forming the substrate portion 42 of the present invention of a thin steel plate and setting the thickness to 1.0 mm or more and 4.0 mm or less, for example, 1.6 mm, the manufacturing cost of the jig 41A and further the jigs 41B to 41E could be reduced, and accordingly, the cost required for the reconstruction work could be reduced. In addition, since the thin steel plate is lightweight, it is easy to handle during carrying at the construction site or during assembly in a narrow manhole, and the construction efficiency is not deteriorated. Incidentally, the thickness of the outer plate portion 43 is set to be about 2.0 mm or more and 6.0 mm or less.

[0020] The other configurations of the jig assembly 4 are the same as those of the conventional jig assembly 1. As shown in FIG. 2, after installing the anticorrosion sheet 3 using this jig assembly 4, a backfill material 5 such as mortar concrete or cement is filled into the gap G between the inner wall 200 of the manhole and the outer surface 31 of the anticorrosion sheet 3, and the uneven surface 201 after removing the corroded part. After the work on the bottom block 23 is completed, the same work is performed on the inclined wall block 21 and the straight wall block 22, and the reconstruction work of the entire manhole 2 is completed.

[0021] In addition, in the above embodiment, the jig assembly 4 having a wedge portion has been described. However, the present invention can be similarly applied to a jig assembly 4 not having a wedge portion. The present invention is characterized in that the thickness of the anticorrosion sheet 3 is increased to enhance the strength, and the substrate portion 42 of the jig 41 is formed of a thin steel plate. It is possible to appropriately change the configuration other than the substrate portion 42. Further, the present invention is applicable to sewer facilities other than the manhole 2.

Explanation of Reference Numerals

[0022] 4 Jig assembly 41(41A~41E) Jig 42 Substrate portion 43 Outer plate portion 44 Bolt and nut 45 Insertion pin 46, 47 Insertion member 48, 49 Tightening member 50 Upper curved end portion 51 Hanging hole 52 Lower curved end portion 53~55 Non-curved end portion

Claims

**Claim 1** Insert a corrosion prevention sheet made of cylindrical synthetic resin into the internal space of the sewer facility, press and hold the corrosion prevention sheet against the inner wall constituting the internal space of the sewer facility with a thin steel plate having synthetic resin adhered to its outer surface, A method for reconstructing a sewer facility, characterized in that a backfill material is filled between the inner wall of the sewer facility and the outer surface of the corrosion prevention sheet. **Claim 2** The method for reconstructing a sewer facility according to claim 1, characterized in that the thickness of the corrosion prevention sheet is 1.4 mm or more and 3.0 mm or less. **Claim 3** The method for reconstructing a sewer facility according to claim 1 or 2, characterized in that the thickness of the thin steel plate is 1.0 mm or more and 4.0 mm or less. **Claim 4** The method for reconstructing a sewer facility according to claim 1 or 2, characterized in that the thickness of the synthetic resin adhered to the outer surface of the thin steel plate is 2.0 mm or more and 6.0 mm or less.

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