Repair method for inspection well

Abstract

The invention relates to the technical field of drainage system pipe network non-excavation repair, in particular to a repair method for an inspection well. The method comprises the steps that firstly, treatment work is conducted before hose repairing; 2, a material treatment stage; step 3, a curing stage; a non-excavation well chamber repairing mode is adopted, the operation area is small, the structure is simple, the manufacturing cost is low, and the repairing speed is high; the composition material is a UV-CIPP material, the performance of the UV-CIPP material in the x direction, the y direction and the z direction is basically close to that of the UV-CIPP material, the bending strength of the UV-CIPP material in the x direction, the Y direction and the Z direction is larger than 200 MPa, the structural strength is high, and the UV-CIPP material can cope with most scenes; the service life is long and the compactness is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trenchless repair of sewer pipe network, and particularly relates to a repair method for inspection well. BACKGROUND

[0002] With the rapid development of urbanization in China, the world's largest urban underground pipe network system has been established. As a component part of the inspection well, the number of inspection wells is in the tens of thousands, and a large number of inspection wells were built in the 1980s and 1990s or even earlier. After a long period of use, problems such as mortar falling off and brick crumbling occur. The traditional repair method is to dig up the road, remove the old well and rebuild the new well. This repair method has obvious disadvantages such as long construction period, great traffic impact, serious construction noise and dust pollution, and high comprehensive cost. Under the social environment and urban development needs, the industry has gradually abandoned the traditional open excavation repair method and turned to trenchless repair technology.

[0003] Problems existing in common inspection well repair methods: (1) using cement mortar repair, low service life, not resistant to water flow and water pressure; (2) using material spraying method for repair, which usually does not provide or provides very small structural strength, and at the same time, this method requires high cleaning of the pipeline, and any residual grease and sludge will affect the adhesion of the sprayed material; (3) common open excavation repair has the problems of large operation area, long construction period, and traffic impact. SUMMARY

[0004] In order to solve the above problems, the present application provides a repair method for inspection well.

[0005] A repair method for inspection well, the specific steps are as follows: Step one, inspection and treatment work before hose repair; Step two, material processing stage: S21, prepare the bottom chute material; S22, divide the bottom chute material greater than 20 cm in step S21 into equal parts, and peel off N layers of ECR glass fiber on the bottom chute material; S23, after the wellbore + well chamber variable diameter material cutting is completed, lay it at the bottom of the inspection well, and fix the 20 cm part of the material with the flange to the shaft wall; S24, the well chamber repair material also peels off 20 cm of N layers of glass fiber, and is cut in staggered layers with step S23; at the same time, the adhesive material is used to paste the joint; Step three, curing stage: S31, using ultraviolet light in-situ curing technology to cure the materials used in step two. S32, in order to complete the material curing, the lamp holder needs to be close to the lower surface, and the lamp leg opening size needs to be adjusted at the variable diameter transition section; S33, after completing the curing operation, the excess part of the well mouth and the pipe mouth material is cut off; S34, the pipe repair is completed, and the inspection well and the pipe mouth sealing operation is performed.

[0006] Further, the bottom chute material in step S21 comprises ECR glass fiber, unsaturated polyester resin and a layer of PE / PA co-extruded film.

[0007] Further, the well shaft + well chamber variable diameter material in step S23 is inflated and pressed to adhere to the inspection well to be repaired by the UV-CIPP technology.

[0008] Further, in the case that the bottom water treatment of the inspection well is not complete in step S11, a layer of PE / PA water-proof film is added to the bottom of the bottom chute material.

[0009] The beneficial effects of the present application are: The present application adopts a trenchless well chamber repair method, has a small operation area, a simple structure, a low cost, a fast repair speed, and is composed of UV-CIPP material, which has a performance close to that of the UV-CIPP material in three directions, a bending strength of more than 200 MPa in three directions, a high structural strength, and can cope with most scenes, a high service life, and a good compactness. BRIEF DESCRIPTION OF DRAWINGS

[0010] The present application will be further described below in combination with the drawings and examples.

[0011] Figure 1 Inspection well schematic for background technology of the present application Figure 1 ; Figure 2 Inspection well schematic for background technology of the present application Figure 2 ; Figure 3 Folded schematic diagram of the well shaft + well chamber repair material of the present application; Figure 4 Cutting schematic diagram of the present application; Figure 5 Schematic diagram of cutting open the bottom chute of the present application with a circular diameter of 20 cm; Figure 6 Schematic diagram of adhering the cut part to the pipe wall. DETAILED DESCRIPTION

[0012] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below.

[0013] As Figures 1 to 6 shown, a repair method for inspection well, the specific steps are as follows: Step one, the processing work before the hose repair: S11, the pipe port sealing and water stop treatment of the inspection well access; S12, the inner wall and bottom chamfer of the inspection well; Step two, material processing stage: S21, prepare the bottom chute material, the diameter of the bottom chute material should be greater than the chute diameter 20-30 cm; S22, the bottom chute material greater than 20 cm in step S21 is divided into 15-20 equal parts, and the 3 layers of ECR glass fiber on the bottom chute material are stripped; S23, after the diameter change material of the shaft + well chamber is cut, it is laid flat at the bottom of the inspection well and the 20 cm material of the turned edge is fixed on the shaft wall; S24, the well chamber repair material is also stripped of 3 layers of glass fiber, and is cut in staggered layers with step S23; at the same time, the adhesive material is used to paste the joint; Step three, curing stage: S31, use ultraviolet light in situ curing technology to cure the materials used in step two; S32, in order to fully complete the material curing, the lamp holder should be as close to the lower surface as possible, and the lamp leg opening size needs to be adjusted at the diameter transition section; S33, after completing the curing operation, cut off the excess material at the wellhead and pipe port; S34, the pipe repair is completed and the inspection well and pipe port sealing operation is carried out.

[0014] The step S11 uses brick sealing to seal the pipe port, which has simple structure, low cost and small operation area.

[0015] As Figure 5 shown, the reference sign a is the chute bottom, and the reference sign b is the split pipe wall material.

[0016] As Figure 6 shown, the reference sign c is the adhesive material action area, and the reference sign d is the split pipe wall material action pipe wall area.

[0017] In step S21, the bottom chute material consists of ECR ​​glass fiber, unsaturated polyester resin, and a layer of PE / PA co-extruded film. If the water treatment at the bottom of the inspection well is incomplete in step S11, a layer of PE / PA waterproof membrane needs to be added to the bottom of the bottom chute material to prevent the bottom material from not curing sufficiently when exposed to water. The chute material is made of conventional straight pipe material, which is disassembled and laid in the bottom chute. The size of the material is determined according to the bottom area of ​​the chute. The material is cut into a circle with a diameter 20cm larger than the diameter of the chute circle. It is then cut evenly on the 20cm diameter of the bottom circle of the chute and placed in the bottom chute. The cut parts fit the pipe wall to facilitate the subsequent bonding of the chute and the well chamber to form a whole.

[0018] In step S23, the diameter-changing material of the well shaft and well chamber is inflated and pressurized to fit the inspection well to be repaired using UV-CIPP technology. A special lamp holder is required to carry a UV curing lamp of a specific wavelength for curing. During this process, the distance between the lamp holder and the pipe wall must be strictly controlled to avoid local curing at the far end and scorching at the near end.

[0019] The well casing and chamber are constructed and cured using a variable-diameter material, while the chute is cured separately. The material between the chute and the well chamber is bonded together. The material composition is similar to UV-CIPP material, and its density is tested using DWA143-3, showing no leakage for 30 minutes at -50 kPa. This effectively improves water seepage problems in inspection wells, offering long service life and excellent density. Because its constituent material is UV-CIPP, its performance in the x, y, and z directions is essentially the same as UV-CIPP material, with bending strength in the X / Y / Z directions exceeding 200 MPa. This high structural strength allows it to handle most application scenarios.

[0020] The inner surface materials of the well shaft, well chamber, and chute are all made of UV-CIPP material. Since the well shaft and well chamber can be regarded as variable diameter pipe sections, the variable diameter UV-CIPP material is directly produced according to the corresponding size. The chute part is irregular in shape, so the UV-CIPP inner lining hose needs to be materialed, laid into the chute part, and then cured together with the well shaft and well chamber parts.

[0021] Specifically, in practical applications, the inflation speed can be selected as 50 mbar / 5 min, but it can also be adjusted according to actual needs.

[0022] The UV curing lamp in step S31 has a curing pressure of 360 mbar, a curing power of 1000 W, a curing speed of 30 cm / 30 min, and a manually lifting lamp holder.

[0023] In step S24, at the contact point between the end of the wellbore chamber material and the chute material, the material is cut in a staggered manner to ensure that the two materials are bonded in layers on the cross section and cured together using a light curing device, thus achieving the purpose of bonding.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for repairing inspection wells, characterized in that: The specific steps are as follows; Step 1: Inspection and preparation work before hose repair; Step Two: Material Processing Stage S21. Prepare the bottom chute material; S22. Divide the bottom chute material that is greater than 20cm in step S21 into equal parts and peel off the N layers of ECR ​​glass fiber on the bottom chute material. S23. After the well shaft + well chamber diameter-changing material is cut, lay it flat and place it at the bottom of the inspection well, and fix the 20cm part of the flanged material to the vertical well wall. S24. Similarly, 20cm of N layers of fiberglass are peeled off from the well chamber repair material and cut in a staggered manner with step S23; at the same time, adhesive material is used to bond the joints. Step 3, Curing Stage: S31. Use ultraviolet light in-situ curing technology to cure the material used in step two; S32. In order to fully complete the material curing, the lamp holder needs to be close to the lower surface, and the opening size of the lamp legs needs to be adjusted at the diameter transition section. S33. After completing the curing operation, cut off the excess material at the wellhead and pipe opening; S34. After the pipeline repair is completed, the manhole and pipe opening should be sealed.

2. The method for repairing inspection wells according to claim 1, characterized in that: In step S11, bricks are used to seal the pipe openings.

3. The method for repairing inspection wells according to claim 1, characterized in that: The bottom chute material in step S21 comprises ECR glass fiber, unsaturated polyester resin, and a layer of PE / PA co-extruded film.

4. The method for repairing inspection wells according to claim 1, characterized in that: In step S23, the diameter-changing material of the wellbore and well chamber is pressurized with air using UV-CIPP technology to fit the inspection well to be repaired.

5. A method for repairing inspection wells according to claim 4, characterized in that: The inflation rate is 50 mbar / 5 min.

6. A method for repairing inspection wells according to claim 1, characterized in that: The UV curing lamp in step S31 has a curing pressure of 360 mbar, a curing power of 1000 W, and a curing speed of 30 cm / 30 min.

7. A method for repairing inspection wells according to claim 3, characterized in that: If the water treatment at the bottom of the inspection well is incomplete in step S11, a layer of PE / PA waterproof membrane needs to be added to the bottom of the bottom chute material.

8. A method for repairing inspection wells according to claim 1, characterized in that: In step S1, the diameter of the bottom chute material needs to be 20-30cm larger than the chute circle diameter.

9. A method for repairing inspection wells according to claim 1, characterized in that: In step S22, the bottom chute material of the portion larger than 20cm is divided into 15-20 equal parts.

10. A method for repairing inspection wells according to claim 1, characterized in that: The value of N is 2 to 5.

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