A method for repairing a large-diameter underground HDPE pipe

Abstract

The present application relates to a kind of underground large-diameter HDPE pipe repair method, comprising the following steps: determining the deformation pipe section of pipeline, the upper side of the deformation pipe section has recessed area;Support structure is built in the upper soil layer of the deformation pipe section, to reinforce the soil above the recessed area;Corresponding recessed area is opened in the inside of the deformation pipe section Working hole;The soil above the recessed area is dug out through the working hole;The recessed area is repaired, to finish the roundness of the deformation pipe section;Cement soil reinforcement layer is formed to the outer periphery annular of the deformation pipe section by grouting to the pipeline outside.Such, maximum degree use existing pipeline to carry out repair, in addition to the other defects of the deformation pipe section still existing to repair also carry out conventional trenchless repair technology processing, finally realize the structural and functional repair of city rainwater and sewage pipeline.Avoid the social influence brought by replacing pipeline large excavation, maximum degree saves engineering investment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trenchless pipe repair, in particular to a method for repairing a large-diameter HDPE pipe underground. BACKGROUND

[0002] According to the pipe repair regulations and existing construction technology, the structural defect problem of the serious deformation of the HDPE (High Density Polyethylene) pipe cannot be effectively solved, and only excavation and pipe replacement or new pipe construction in a different location can be used to solve similar problems. Due to the modernization of the city, the burial depth of many pipes buried underground in the early years has been increased, the ground has been raised or the additional load on the ground has changed greatly, and the HPDE pipe material is prone to damage in the pipe repair project. The burial depth of many old city HDPE main pipes is large, the cost of excavation and pipe replacement is high, the social impact is wide, the construction difficulty is great, and the construction party is often greatly disturbed in the pipe repair project. SUMMARY

[0003] Based on the above description, the present application provides a method for repairing a large-diameter HDPE pipe underground to solve the problem that the existing HDPE pipe repair method needs to excavate and replace the pipe or build a new pipe in a different location, which is high in cost, wide in social impact, and difficult in construction.

[0004] The technical scheme for solving the above technical problems is as follows:

[0005] A method for repairing a large-diameter HDPE pipe underground, comprising the following steps:

[0006] Determine the deformed pipe section of the pipe, and the upper side of the deformed pipe section has a recessed area;

[0007] Build a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area;

[0008] Open a working hole in the interior of the deformed pipe section corresponding to the recessed area;

[0009] Excavate the soil above the recessed area through the working hole;

[0010] Repair the recessed area to trim the roundness of the deformed pipe section;

[0011] Grouting is performed outside the pipe to form a peripheral annular cement-soil reinforcement layer surrounding the deformed pipe section.

[0012] On the basis of the above technical scheme, the present application can also be improved as follows:

[0013] Further, the step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area comprises:

[0014] inserting a plurality of geotechnical anchor rods arranged in an array into the soil above the recessed area;

[0015] arranging a reinforced concrete slab above the plurality of geotechnical anchor rods, so that the upper ends of the plurality of geotechnical anchor rods are anchored into the reinforced concrete slab, to form the support structure.

[0016] Further, the spacing between each of the geotechnical anchor rods and the upper side of the deformed pipe section is L, 0.5m≤L≤0.8m.

[0017] Further, the step of opening working holes in the interior of the deformed pipe section corresponding to the recessed area comprises:

[0018] opening two working holes in the interior of the deformed pipe section corresponding to the recessed area, the two working holes being respectively located on the two sides of the recessed area along the axial direction of the pipeline.

[0019] Further, the step of excavating the soil above the recessed area through the working holes comprises:

[0020] arranging two soil taking chutes in the two working holes respectively, and taking out the soil above the recessed area through the two soil taking chutes.

[0021] Further, the step of determining the deformed pipe section of the pipeline comprises:

[0022] entering the pipeline by a pipeline detection robot to detect the deformed pipe section.

[0023] Further, the step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area comprises:

[0024] conducting geophysical prospecting on the deformed pipe section, and determining the building scheme of the support structure according to the results of the geophysical prospecting.

[0025] Further, the step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area comprises:

[0026] conducting plugging, construction diversion and dredging on the deformed pipe section.

[0027] Further, the step of repairing the recessed area to correct the roundness of the deformed pipe section comprises:

[0028] arranging a hydraulic device in the deformed pipe section, and pushing the recessed area upward by the hydraulic device to correct the roundness of the deformed pipe section.

[0029] Further, the step of injecting grout outside the pipe to form a peripheral annular cement-soil reinforcement layer surrounding the deformed pipe section comprises:

[0030] The peripheral soil layer at the deformed pipe section is waterproofed and reinforced by injecting grout to block the permeation path of the peripheral soil layer.

[0031] Compared with the prior art, the technical scheme has the following beneficial technical effects:

[0032] First, the deformed pipe section of the pipe is determined, and the upper side of the deformed pipe section has a recessed area; then a support structure is built on the upper soil layer of the deformed pipe section to reinforce the soil body above the recessed area; then a working hole is formed in the deformed pipe section corresponding to the recessed area; since the soil body above the recessed area has been reinforced, the soil body above the recessed area can be excavated through the working hole; then the recessed area is repaired to trim the roundness of the deformed pipe section; and grout is injected outside the pipe to form a peripheral annular cement-soil reinforcement layer surrounding the deformed pipe section. The strength of the deformed pipe section is reinforced. In this way, the existing pipe is used to the maximum extent for repair, and other defects (such as cracks, holes, etc.) existing in the deformed pipe section are treated by conventional trenchless repair technology (such as stainless steel quick lock, etc.), so as to finally realize structural and functional repair of the urban rainwater and sewage pipe. The social impact of large excavation for pipe replacement is avoided, and the engineering investment is maximized. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A flowchart of a large-diameter HDPE pipe repair method provided by the embodiment of the present application is shown in the figure;

[0034] Figure 2 A structural diagram of a deformed pipe section in a large-diameter HDPE pipe repair provided by the embodiment of the present application is shown in the figure;

[0035] Figure 3 A three-dimensional structural diagram of a large-diameter HDPE pipe repair provided by the embodiment of the present application is shown in the figure;

[0036] Figure 4 A sectional view of a large-diameter HDPE pipe repair provided by the embodiment of the present application is shown in the figure.

[0037] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0038] 1, pipe; 11, deformed pipe section; 111, recessed area; 112, working hole; 113, deformed boundary line; 114, repair boundary line; 2, support structure; 21, rock mass anchor rod; 22, reinforced concrete plate; 23, reinforced area; 3, reinforcement layer; 4, soil removal chute. DETAILED DESCRIPTION

[0039] For the purposes of this application, a more complete description of the application will be presented with reference to the associated drawings. Embodiments of the application are illustrated in the drawings. However, the application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0041] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device is inverted or flipped over, a lower surface or element that is described as "below" or "beneath" another surface or element in one orientation can then be described as "above" or "over" the other surface or element in the other orientation. Therefore, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in other ways (for example, rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0042] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0043] Reference will now be made to Figures 1 to 4 The application provides a method for repairing a large-diameter HDPE pipe underground, comprising the following steps:

[0044] S10, determining a deformed pipe section 11 of the pipe 1, the deformed pipe section 11 having a recessed area 111 on the upper side;

[0045] S20, building a support structure 2 on the upper soil layer of the deformed pipe section 1 to reinforce the soil above the recessed area 111;

[0046] S30, opening a working hole 112 in the inside of the deformed pipe section corresponding to the recessed area 111;

[0047] S40, excavating the soil above the recessed area 111 through the working hole 112;

[0048] S50, repairing the recessed area 111 to modify the roundness of the deformed pipe section 11;

[0049] S60, grouting outside the pipe 1 to form a cement-soil reinforcement layer 3 in the shape of a ring surrounding the periphery of the deformed pipe section 11.

[0050] First, the deformed pipe section 11 of the pipe 1 is determined, and the upper side of the deformed pipe section 11 has a recessed area 111. Then, a support structure 2 is built on the upper soil layer of the deformed pipe section 11 to reinforce the soil above the recessed area 111. Then, a working hole 112 is opened in the deformed pipe section 11 corresponding to the recessed area 111. Since the soil above the recessed area 111 has been reinforced, the soil above the recessed area 111 can be excavated through the working hole 112. Then, the recessed area 111 is repaired to modify the roundness of the deformed pipe section 11. Grouting is performed outside the pipe 1 to form a cement-soil reinforcement layer 3 in the shape of a ring surrounding the periphery of the deformed pipe section 11. The strength of the deformed pipe section 11 is strengthened. In this way, using the existing pipe 1, only the deformed pipe section 11 is repaired by trenchless repair technology, and other defects (such as cracks, holes, etc.) existing in the repaired deformed pipe section are also treated by conventional trenchless repair technology (such as stainless steel quick lock, etc.). The structural and functional repair of the urban rainwater and sewage pipe 1 is realized. The social impact of large excavation for replacing the pipe 1 is avoided, and the engineering investment is maximized.

[0051] Specifically, the step S20 comprises:

[0052] S201, inserting a plurality of geotechnical anchor rods arranged in an array into the soil above the recessed area 111;

[0053] S202, arranging a reinforced concrete slab 22 above the plurality of geotechnical anchor rods, so that the upper ends of the plurality of geotechnical anchor rods are anchored into the reinforced concrete slab 22, to form the support structure 2.

[0054] Referring to Figure 3 and Figure 4After the position of the deformed pipe section 11 and the recessed area 111 are determined, a plurality of rock body anchor rods 21 are anchored downward from the ground into the soil above the deformed pipe section 11 to reinforce the soil above the deformed pipe section 11 and enhance the integrity of the soil above the deformed pipe section 11 to facilitate subsequent excavation of the working hole 112 and soil removal. A reinforced concrete slab 22 is arranged above the plurality of rock body anchor rods 21, and the upper ends of the plurality of rock body anchor rods 21 are anchored into the reinforced concrete slab 22. The reinforced concrete slab 22 needs to be arranged beyond the pipe 1 along the radial direction of the pipe 1, and the reinforced concrete needs to be arranged beyond the recessed area 111 along the axial direction of the pipe 1. Thus, the reinforced concrete slab and the plurality of rock body anchor rods 21 jointly form a reinforced area 23 above the deformed pipe section 1, which can better bear the upper load, prevent excessive local stress of the soil layer, and avoid the phenomenon that the pipe 1 that has been repaired again.

[0055] It should be noted that the plurality of rock body anchor rods 21 are arranged in a matrix, and the number of the plurality of rock body anchor rods 21 and the spacing therebetween are not limited. The distance of the reinforced concrete slab 22 beyond the pipe 1 along the radial direction of the pipe 1 and the distance of the reinforced concrete beyond the recessed area 111 along the axial direction of the pipe 1 are also not limited. They are specifically designed and calculated according to the actual construction situation.

[0056] More specifically, referring to Figure 3 and Figure 4 , the spacing between each rock body anchor rod and the upper side of the deformed pipe section 11 is L, and 0.5m≤L≤0.8m. The setting space of the reinforcing layer 3 is provided. Among the plurality of rock body anchor rods 21, the rock body anchor rod 21 located directly above the pipe 1 can abut against the reinforcing layer 3, so that the upper load can be decomposed from the reinforced concrete slab 22 to each rock body anchor rod 21 and then transmitted to the reinforcing layer 3, reducing the load on the pipe body and prolonging the service life.

[0057] It should be noted that the diameter of the pipe 1 is set as D, and D≥1m. The distance between the ground and the upper side of the reinforced concrete is set as H, and H≥1m.

[0058] The step S30 includes:

[0059] S301, two working holes 112 are excavated in the deformed pipe section 11 corresponding to the recessed area 111, and the two working holes 112 are located on the two sides of the recessed area 111 along the axial direction of the pipe 1.

[0060] The step S40 comprises:

[0061] S401, two earth taking chutes 4 are arranged in the two working holes 112 respectively, and the earth above the recessed area 111 is taken out through the two earth taking chutes 4.

[0062] In the embodiment, with reference to Figure 2 Two working holes 112 are arranged in the inside of the deformation pipe section 11 corresponding to the recessed area 111, and the two working holes 112 are spaced apart along the axial direction of the pipeline 1 and arranged close to the edges of the recessed area 111 respectively. Two earth taking chutes 4 are arranged in the two working holes 112 respectively, and the lower ends of the two earth taking chutes 4 are arranged in the pipeline 1, and the upper ends of the two earth taking chutes 4 are arranged in a direction close to each other, so that the earth above the recessed area 111 can be taken out efficiently to provide a repair space for the subsequent roundness repair of the pipeline 1. If the groundwater is very rich outside the deformation pipe section 11, a dewatering well can be arranged on the side of the deformation pipe section 11 in advance.

[0063] The step S10 comprises:

[0064] S101, the pipeline detection robot enters the pipeline 1 to detect the deformation pipe section 11.

[0065] It should be noted that the pipeline detection robot is a digital high-definition pipeline CCTV detection robot commonly used in construction, which will not be described here.

[0066] The step S20 comprises the following steps:

[0067] S110, geophysical prospecting is performed on the deformation pipe section 11, and a construction scheme of the support structure 2 is determined according to the geophysical prospecting structure.

[0068] The step S20 further comprises the following steps:

[0069] S310, the deformation pipe section 11 is blocked, construction diversion is performed, and dredging is performed.

[0070] In the embodiment, after the support structure 2 is built and passes the acceptance, the deformation pipe section is blocked, the liquid in the deformation pipe section 1 is diverted out, and cleaning is performed, so that the operator can enter the pipeline 1, and the working holes 112 are subsequently arranged and the roundness is subsequently adjusted.

[0071] The step S50 comprises:

[0072] S501, a hydraulic device is arranged in the deformation pipe section 1, and the recessed area 111 is pushed upward by the hydraulic device to correct the roundness of the deformation pipe section 1.

[0073] Referring to Figure 2 The hydraulic device is used to restore the deformation boundary line 113 of the deformed pipe section 1 to a restored boundary line 114. It should be noted that the hydraulic device and the operation of the hydraulic device for modifying the deformed pipe section 1 are not described in detail, which are conventional operations in the art.

[0074] The step S60 further includes:

[0075] S70, waterproof reinforcement is performed on the peripheral soil layer at the deformed pipe section 11, and the permeation path of the peripheral soil layer is blocked by grouting.

[0076] Specifically, in the embodiment, after the roundness of the deformed pipe section 11 is restored according to the hydraulic device, a plurality of grouting pipes are arranged in the pipeline 1, and the peripheral side of the pipeline 1 is grouted, and the slurry is grouted into the soil layer on the peripheral side of the pipeline 1. The slurry occupies the position of the water and air in the soil particles or rock fissures in the form of filling, permeation and compaction, etc. After a certain period of time, the slurry cements the original loose soil particles or fissures into a whole to form the reinforcing layer 3 surrounding the peripheral side of the pipeline 1. The reinforcing layer 3 has high strength, high waterproof performance and good chemical stability. Then, each working hole 112, each grouting hole or other structural defect points such as cracks, permeation and holes in the pipeline 1 are blocked to ensure the sealing performance of the pipeline 1. The conventional trenchless repair method in engineering is used for treatment, for example, a stainless steel quick lock is arranged, which is not described in detail. Finally, the structural and functional recovery of the pipeline 1 is realized.

[0077] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of repairing an underground large diameter HDPE pipe, characterized in that, The method comprises the following steps: determining a deformed pipe section of a pipeline, the deformed pipe section having a recessed area on its upper side; building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area; opening a working hole in the deformed pipe section corresponding to the recessed area; excavating the soil above the recessed area through the working hole; repairing the recessed area to correct the roundness of the deformed pipe section; grouting outside the pipeline to form a peripheral annular cement-soil reinforcement layer surrounding the deformed pipe section; the step of opening a working hole in the deformed pipe section corresponding to the recessed area comprises: opening two working holes in the deformed pipe section corresponding to the recessed area, and the two working holes are respectively located on the two sides of the recessed area along the axial direction of the pipeline; the step of excavating the soil above the recessed area through the working hole comprises: arranging two soil taking chutes in the two working holes respectively, and taking out the soil above the recessed area through the two soil taking chutes.

2. The method of repairing a large diameter underground HDPE pipe according to claim 1, characterized in that, The step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area comprises: inserting a plurality of geotechnical anchor rods arranged in an array into the soil above the recessed area; arranging a reinforced concrete slab above the plurality of geotechnical anchor rods, so that the upper ends of the plurality of geotechnical anchor rods are anchored into the reinforced concrete slab, to form the support structure.

3. The method of repairing a large diameter underground HDPE pipe according to claim 2, characterized in that, The distance between each geotechnical anchor rod and the upper side of the deformed pipe section is L, and 0.5m≤L≤0.8m.

4. The method of repairing a buried large diameter HDPE pipe according to claim 1, characterized in that, The step of determining a deformed pipe section of a pipeline comprises: entering the pipeline by a pipeline detection robot to detect the deformed pipe section.

5. The method of repairing a buried large diameter HDPE pipe according to claim 1, characterized in that, Before the step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area, the method comprises: conducting geophysical prospecting on the deformed pipe section, and determining the building scheme of the support structure according to the geophysical prospecting result.

6. The method of repairing a buried large diameter HDPE pipe according to claim 1, characterized in that, After the step of building a support structure on the upper soil layer of the deformed pipe section to reinforce the soil above the recessed area, the method comprises: plugging, construction diversion and dredging of the deformed pipe section.

7. The method of repairing a buried large diameter HDPE pipe according to claim 1, characterized in that, The step of repairing the recessed area to correct the roundness of the deformed pipe section comprises: arranging a hydraulic device in the deformed pipe section, and pushing the recessed area upward by the hydraulic device to correct the roundness of the deformed pipe section.

8. The method of repairing a buried large diameter HDPE pipe according to claim 1, characterized in that, After the step of grouting outside the pipeline to form a peripheral annular cement-soil reinforcement layer surrounding the deformed pipe section, the method comprises: waterproofing and reinforcing the peripheral soil layer at the deformed pipe section, and blocking the permeation path of the peripheral soil layer by grouting.

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