A method for manufacturing a double-socket self-sealing composite pipe

Abstract

The application relates to the technical field of pipeline construction, and provides a preparation method of a double-socket self-sealing composite pipe, which comprises the following steps: S1: respectively preparing a rigid pipe body and a flexible pipe body, a plurality of outward convex support surfaces are arranged on the outer surface of the rigid pipe body, the flexible pipe body is sleeved into one end of the rigid pipe body with a smaller outer diameter, and a closed cavity is formed between the inner wall of the flexible pipe body and the outer wall of the rigid pipe body; and S2: the support surfaces divide the cavity into two or more than two chambers, glue injection holes are arranged on the flexible pipe body at positions corresponding to the chambers, a corrosion-proof material capable of solidification is injected into the chambers under pressure, the corrosion-proof material fills the chambers, and the corrosion-proof material is allowed to solidify. The socket head and the socket interface are connected in a rigid and flexible mode, the sealing performance is good, a sealing ring is arranged at the end of the socket head, the position of the composite pipe splicing is double-sealed, and the sealing effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline construction, in particular to a preparation method of a double-socket self-sealing composite pipe. BACKGROUND

[0002] With the further development of urbanization and the gradual improvement of rural living conditions, the demand for public infrastructure and household water supply and drainage is further improved, which cannot be separated from pipeline installation, maintenance and other construction work.

[0003] The reinforced concrete pipe interface of the socket interface is not resistant to tension, the water stop performance is not high, the pipe material self-weight is large, and the corrosion resistance is poor, so the HDPE solid wall pipe has a broad market application prospect. In the installation and maintenance construction of the pipeline, such as in the trenchless construction of the drainage pipeline, there are many cases where there is not enough construction space on one side, so only the inclined drill hole can be constructed on one side, and then the well is made on the other side, so as to install the connecting pipeline in the well, pull the pipe section, and complete the laying.

[0004] The existing HDPE solid wall pipe (DN300-800mm) pipe section length is 6m, 9m, 12m, etc. In the installation or maintenance construction, the existing butt joint method of the pipeline interface is only hot melting butt joint, clamp connection, electric heating melting, and hot shrinkage band connection. These pipeline interface methods have the following disadvantages in the municipal pipeline trenchless construction: 1) hot melting butt joint needs a certain site space, and can only be constructed after the butt joint is completed, which is not suitable for in-well pipe jacking construction, and the hot melting butt joint will form an inner flange, which needs to be cut off; 2) electric heating melting connection is dangerous in water environment, is not convenient for construction, and is easy to collapse the pipe and produce leakage points during melting; 3) hot shrinkage band connection has slightly low strength, and large-diameter pipeline heating is not uniform, which is not convenient; 4) clamp connection is not suitable for trenchless construction, the pipeline connection has poor integrity, poor sealing performance, the pipeline interface is easy to disengage, and the capacity to withstand tension and vibration is limited.

[0005] In addition, there are the following pipeline flexible socket interfaces on the market:

[0006] 1. Sealing ring socket interface HDPE solid wall sealing pipe, the HDPE solid wall short pipe section of the sealing ring socket interface is cut out at one end to form a socket, and cut out at one end to form a socket, which is sealed by a sealing ring. However, the sealing ring socket interface of the HDPE solid wall short pipe section has poor airtightness and no tensile resistance, although it can be used for trenchless lining repair, it is easy to disengage and cannot be used for pipe jacking construction.

[0007] 2. Sawtooth double-seal self-locking socket interface HDPE extruded solid wall pipe, because the pipe is extruded, the extruded pipe is mostly oval and has a large residual stress after cooling and forming, the plastic extruded pipe will cause the interface wall thickness to be uneven and have a large tolerance when processing the flexible interface due to the ovality of the pipe material, the installation difficulty is large due to the uneven interface wall thickness during construction, the installed pipeline is prone to water seepage due to insufficient sealing, and the interface unevenness during installation causes uneven stress, resulting in tearing of the pipe material, and the extruded pipe material has a large internal stress, resulting in continuous tearing, which cannot be used for pipe jacking construction.

[0008] 3. Sawtooth double-seal composite winding solid wall pipe, the processing technology of the pipe is improved, and the material has a certain property, the produced pipe material is relatively round, basically meeting the processing and construction requirements of the flexible interface, but the pipe material is all plastic, the physical properties of the plastic material have advantages and disadvantages, the joint has a weak link after processing, and cannot meet the requirements of all construction environments in terms of shear resistance and sealing performance, so this product is an excellent product on the market, but it also needs to comply with the performance of plastic and select the construction environment that meets the conditions.

[0009] In the non-excavation laying and repair construction of municipal drainage pipelines, the above-mentioned various pipe materials have simple interface HDPE solid wall pipe joints that can be installed in small spaces, which have the advantages of convenient connection, good sealing performance, tensile resistance, easy pipe laying in inspection wells or working wells, and replacement inside the original pipeline by jacking, but the above interface methods cannot meet the construction of various soil and various construction methods in complex environments. Chinese patent: Preparation method of double-socket self-sealing composite pipe, application publication number: CN 113007472A, application publication date: 2021.06.22, discloses a socket head, which is provided at both ends of a flexible pipe, and is spliced between the rigid cast iron joint and the flexible pipe body to achieve a sealing effect, but this pipe has the following problems: when jacking is required, the flexible pipe is easily deformed under axial force, and the socket is not convenient to use. Therefore, a pipe body with the characteristics of rigidity and flexibility and capable of sealing installation is needed. SUMMARY

[0010] To solve one or more technical problems in the prior art, the present application provides a preparation method of a double-socket self-sealing composite pipe, which at least provides a beneficial choice or creates conditions.

[0011] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0012] A preparation method of a double-socket self-sealing composite pipe, characterized in that it comprises the following steps:

[0013] S1: respectively prepare rigid pipe body and flexible pipe body, the rigid pipe body one end big one end small, its outer diameter smaller one end is equipped with annular closed first step, its outer diameter larger one end is equipped with annular closed second step, the rigid pipe body outer surface and between first step and second step interval is equipped with multiple outer convex support surface, the flexible pipe body is from the rigid pipe body outer diameter smaller one end and is covered, and the flexible pipe body inner surface is covered on the support surface, until the flexible pipe body top is on the second step face, the flexible pipe body inner wall and the rigid pipe body outer wall between form closed cavity;

[0014] S2: the support surface will the cavity be divided into two or more than two chambers, and the flexible pipe body is opened on the position corresponding the chamber Glue hole is injected, and the chamber is pressurized and is injected with the anticorrosive material that can solidify, so that the anticorrosive material fills the chamber, and the anticorrosive material solidifies.

[0015] Preferably, the rigid pipe body outer diameter larger one end is socket head, and the rigid pipe body outer diameter smaller one end and the flexible pipe body are interval arranged and form receiving interface, and adjacent composite pipes are connected through the socket head and the receiving interface mutual cooperation.

[0016] Preferably, the receiving interface is equipped with a sealing ring inside and located on the side of the first step, and the top of the adjacent cooperating socket head is on one side of the sealing ring.

[0017] Preferably, the receiving interface includes a flexible end portion located above and a rigid end portion located below, and the socket head outer diameter and the inner diameter of the flexible end portion are interference fit.

[0018] Preferably, the inner wall of the socket head is provided with a recess recessed to the outside, and the rigid end portion is accommodated in the recess.

[0019] Preferably, the upper surface of the socket head is provided with a plurality of annular stop teeth, and the stop teeth are pressed into the bottom of the flexible end portion.

[0020] Preferably, the height of the support surface is equal to the height of the first step surface, and the support surface is provided with a notch to make the two or more than two chambers communicate with each other.

[0021] Preferably, the rigid pipe body is a ductile iron pipe formed by pressure casting, the flexible pipe body is a polyethylene pipe formed by extrusion, and the anticorrosive material is a polyethylene material.

[0022] Preferably, the height of the second step is equal to the outer surface of the flexible pipe body.

[0023] The present application has the following beneficial effects:

[0024] 1. The socket and connector of the present invention adopt rigid and flexible docking, external expansion lock sealing, and utilize the shrinkable properties of polyethylene material to permanently ensure zero leakage of the pipeline and good sealing performance. Moreover, a sealing ring is provided at the end of the socket, which can ensure the safety during installation and also act as a jacking and correction buffer pad. It also allows repeated stretching and resetting of the pipe section under dynamic load, so that the joint of the composite pipe has double sealing and good sealing effect.

[0025] 2. Anti-reverse teeth are provided on the socket to improve the tensile and shear strength of the composite pipe after splicing;

[0026] 3. Multiple support surfaces are provided on the outer surface of the rigid tube. The area of ​​the support surfaces is small, so the friction between the rigid tube and the flexible tube is small when the flexible tube is inserted, making it easy to insert.

[0027] 4. After the flexible tube is inserted into the rigid tube, an easily solidified anti-corrosion material is injected under pressure to fill the cavity. This serves two purposes: firstly, it supports the flexible tube, and secondly, the anti-corrosion material acts as an adhesive to bond the rigid and flexible tubes together when it solidifies, making it less likely for the two tubes to detach.

[0028] 5. Solve the problem of easy bursting of rigid material joints during jacking and correction, and solve the problem of poor stress at the joint of flexible pipes;

[0029] 6. The design of flexible tubes encasing rigid tubes can absorb external shock waves, reduce the vibration of the internal rigid tubes, and prevent the rigid tubes from being damaged by ground vibrations or other dynamic loads.

[0030] 7. The outer flexible pipe is made of polyethylene. Even if the inner rigid pipe is damaged or corroded later, the flexible pipe can still be used, ensuring the service life of the composite pipe. Attached Figure Description

[0031] Fig. 1 This is a full sectional view of the embodiment;

[0032] Fig. 2 This is a schematic diagram of the structure at the interface of the two composite pipes. Detailed Implementation

[0033] The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0034] Reference Figs. 1-2 This embodiment provides a method for preparing a double-socket self-sealing composite pipe, including the following steps:

[0035] S1: respectively prepare rigid pipe body 1 and flexible pipe body 2, the rigid pipe body 1 is a die-casting nodule cast iron pipe, the flexible pipe body 2 is extrusion molding polyethylene pipe, the rigid pipe body 1 one end big one end small, its outer diameter smaller one end is equipped with annular closed first step 5, its outer diameter larger one end is equipped with annular closed second step 7, the rigid pipe body 1 outer surface and between first step 5 and second step 7 interval is equipped with multiple outer convex support surface 8, the height of support surface 8 is less than or equal to the height of first step 5 surface, the flexible pipe body 2 is from the rigid pipe body 1 outer diameter smaller one end and is set into, the flexible pipe body 2 inner surface is set on support surface 8, the contact surface of flexible pipe body 2 inner wall and support surface 8 is small, and the friction is small, so it is easy to set into flexible pipe body 2, until the end of flexible pipe body 2 is on the face of second step 7, the flexible pipe body 2 inner wall, the rigid pipe body 1 outer wall and first step 5 face form closed cavity;

[0036] S2: the support surface 8 divides the cavity into two or more than two chambers 9, the support surface 8 is equipped with notch so that two or more than two the chamber 9 is communicated with each other, the position corresponding to the chamber 9 is set up glue injection hole 10 on the flexible pipe body 2, and the glue injection process is conventional pressurized glue injection, which is not specifically described, and the anticorrosive material is injected into the chamber 9 under pressure, so that the anticorrosive material fills the chamber 9, and the anticorrosive material is solidified. The anticorrosive material can be selected from the same material as the flexible pipe body 2, which is polyethylene material. The bonding strength between the solidified anticorrosive material and the flexible pipe body 2 is higher. The molten polyethylene material is injected into the chamber 9 until the chamber 9 is filled. The polyethylene material is solidified. First, it can support the flexible pipe body 2. Second, the anticorrosive material acts as an adhesive to bond the rigid pipe body 1 and the flexible pipe body 2 into one body, so the flexible pipe body 2 and the rigid pipe body 1 are not easy to fall off. In this way, the flexible pipe body 2 is easily set into the rigid pipe body 1, and the connection strength between the flexible pipe body 2 and the rigid pipe body 1 is ensured.

[0037] Specifically, the larger end of the rigid pipe body 1 is a socket head 3, and the smaller end of the rigid pipe body 1 and the flexible pipe body 2 are spaced apart to form a receiving port 4. The socket head 3 and the receiving port 4 are connected to each other through the socket head 3 and the receiving port 4. The receiving port 4 is provided with a sealing ring 6 on the side of the first step 5. The sealing ring 6 is a circular cross-section sealing ring 6. The top of the socket head 3 is on one side of the sealing ring 6. The receiving port 4 includes a flexible end 41 on the outside and a rigid end 42 on the inside. The socket head 3 and the flexible end 41 are in interference fit. Therefore, when the two composite pipes are connected, the rigid socket head 3 and the soft flexible end 41 form a first layer of sealing. The socket head 3 is pressed against the sealing ring 6, and the sealing ring 6 is arranged on the side of the first step 5, which forms a second layer of sealing. The double-layer sealing ensures the sealing effect.

[0038] Specifically, the inner wall of the socket head 3 is provided with a recess 31 recessed to the outside, the rigid end 42 is accommodated in the recess 31, and the bottom of the rigid end 42 on a composite pipe is flush with the bottom of the rigid pipe body 1 of an adjacent composite pipe, so that the inner wall of the spliced pipe body is smooth and flat, reducing the pipe resistance and reducing the risk of leakage.

[0039] Specifically, the upper surface of the socket head 3 is provided with a plurality of annular stop teeth 32, the stop teeth 32 are pressed into the bottom of the flexible end 41, so that the composite pipe is not easy to fall off after splicing.

[0040] Specifically, the height of the second step 7 is flush with the outer surface of the flexible pipe body 2. Thus, the outer surface of the spliced composite pipe is smooth, and the adjacent flexible end 41 is flat and rests on the side of the second step 7.

[0041] The present application sets a plurality of support surfaces 8 on the outer surface of the rigid pipe body 1. When the flexible pipe body 2 is sleeved, the contact area between the flexible pipe body 2 and the rigid pipe body 1 is small, the friction between the rigid pipe body 1 and the flexible pipe body 2 is small, the flexible pipe body 2 is easily sleeved, and after the flexible pipe body 2 is sleeved, the easily solidified anticorrosive material is injected to fill the chamber 9. First, the flexible pipe body 2 can be supported, and second, the rigid pipe body 1 and the flexible pipe body 2 are bonded into a whole by the anticorrosive material as an adhesive when it solidifies, so they are not easy to fall off. The socket head 3 and the socket 4 are directly connected by rigid and flexible docking, which has good sealing performance. Moreover, a sealing ring 6 is arranged at the end of the socket head 3, so that the interface position has double sealing, the sealing effect is good, and the sealing ring 6 also plays a buffering role when the composite pipe is jacked, avoiding damage to the rigid pipe body 1. The flexible pipe body 2 on the outside of the composite pipe can reduce the vibration of the internal rigid pipe body 1, avoid damage to the rigid pipe body 1 due to ground vibration, especially when the car starts or brakes, the dynamic load on the composite pipe under the road is particularly large, and the rigid pipe body 1 is particularly damaged. The rigid pipe body 1 is provided with a flexible pipe body 2 on the outside, which can protect the rigid pipe body 1. The flexible pipe body 2 on the outside is a polyethylene pipe. When the internal rigid pipe body 1 is damaged or corroded in the later period, the flexible pipe body 2 can still be used, ensuring the service life of the composite pipe.

[0042] The above describes one embodiment of the present application in detail, focusing on the interference fit socket connection structure of the rigid plug and flexible socket, but the above description is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A method of making a dual socket self-sealing composite pipe, characterized in that, The method comprises the following steps: S1: respectively preparing a rigid pipe body and a flexible pipe body, the rigid pipe body having a large end and a small end, the small end being provided with a ring-shaped closed first step, the large end being provided with a ring-shaped closed second step, a plurality of outward convex support surfaces being arranged on the outer surface of the rigid pipe body between the first step and the second step, the flexible pipe body being sleeved into the rigid pipe body from the small end, the inner surface of the flexible pipe body being sleeved on the support surfaces until the flexible pipe body abuts against the second step, a closed cavity being formed between the inner wall of the flexible pipe body and the outer wall of the rigid pipe body; S2: the support surfaces divide the cavity into two or more chambers, glue injection holes being formed on the flexible pipe body at positions corresponding to the chambers, and a corrosion-proof material capable of solidification being injected into the chambers under pressure so as to fill the chambers with the corrosion-proof material and wait for the corrosion-proof material to solidify; the large end of the rigid pipe body being a socket head, a receiving port being arranged between the small end of the rigid pipe body and the flexible pipe body, and adjacent composite pipes being connected to each other through the socket head and the receiving port.

2. A method of making a dual bell and seal composite pipe according to claim 1, wherein: a sealing ring being arranged in the receiving port and on the side of the first step, the top of the socket head of the adjacent socket head abutting against one side of the sealing ring.

3. A method of making a dual bell and seal composite pipe according to claim 1, wherein: the receiving port comprising a flexible end portion on the outer side and a rigid end portion on the inner side, the outer diameter of the socket head and the inner diameter of the flexible end portion being in interference fit.

4. A method of making a dual bell and seal composite pipe according to claim 3, wherein: the inner wall of the socket head being provided with a recess recessed to the outer side, the rigid end portion being accommodated in the recess.

5. The method of claim 3, wherein: the upper surface of the socket head being provided with a plurality of annular stop teeth, the stop teeth being pressed into the bottom of the flexible end portion.

6. The method of claim 1, wherein: the height of the support surface being equal to the height of the first step, the support surface being provided with a notch so that the two or more chambers are connected to each other.

7. The method of claim 1, wherein: the rigid pipe body being a die-cast nodular cast iron pipe, the flexible pipe body being an extruded polyethylene pipe, and the corrosion-proof material being a polyethylene material.

8. The method of claim 1, wherein: the height of the second step being equal to the outer surface of the flexible pipe body.

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