Construction method of pipeline and pipe gallery joint

Abstract

The application discloses a pipeline and pipe gallery joint construction method, comprising the following steps: S1. purchasing red copper sheet according to the specification requirements, and processing and manufacturing type A water stop belt and type B water stop belt through the red copper sheet; S2. processing and manufacturing type A red copper ring through pressure conversion in a prefabricated pipe factory; S3. prefabricated pipeline type A red copper ring construction: pouring pipeline concrete in a normal way, embedding one end of the type A red copper ring in the pipeline concrete at both ends of the pipeline, completing the pipeline concrete pouring, completing the curing period, and disassembling the circular ring mold; S4. processing and manufacturing type B red copper ring through pressure conversion at the pipeline in-joint in a pipeline laying construction site; S5. setting a joint water stop device, and welding the type B red copper ring on both sides to the type A red copper ring; S6. protecting the joint water stop device; and S7. pressure test. The application creates a flat joint overall belt-shaped red copper sheet water stop device and a pipeline joint method construction, and the prefabricated reinforced concrete pipeline engineering is long-distance pressure water conveying, and the pipeline joint does not cause water leakage, effectively solving the problem of water leakage of the prefabricated reinforced concrete pipeline joint.

Description

Technical Field

[0001] This invention belongs to the fields of water conservancy and municipal technology, and specifically relates to a construction method for pipe and pipe gallery joints. Background Technology

[0002] Precast concrete pipes typically employ three connection methods: spigot and socket joints, tongue and groove joints, and plain joints. In pressurized water transmission projects in water conservancy and municipal engineering, precast concrete pipe joints generally use spigot and socket joints with rubber rings for water sealing. The spigot and socket precast concrete pipe joint is sealed with a rubber sealing ring, employing a dovetail self-sealing structure for water sealing. The installation of the rubber ring in spigot and socket joints requires extremely precise control; any deviation can easily lead to leakage.

[0003] The existing precast concrete pipe joint technology in water conservancy and municipal engineering pressurized water transmission projects has many problems: First, the quality of pipe materials and rubber waterstops is poor. Pipe materials have cracks or localized loose concrete, resulting in poor pressure resistance and impermeability, making them prone to breakage and leakage. Second, the surface smoothness and flatness of the concrete at the spigot and socket are poor, making the sealing surface very rough and difficult to achieve a tight seal with the rubber ring, easily leading to leakage. Third, large deviations in pipe diameter make installation prone to misalignment, and the rubber waterstop may have reduced diameter, air holes, or cracks, causing leakage at the joint after pipe connection. Fourth, the rubber ring at the spigot and socket is often twisted or mispositioned, resulting in insufficient insertion depth and easy leakage at the pipe joint. Fifth, pipe alignment is difficult during on-site installation, and the lack of a positioning groove for the rubber ring makes it easy to be squeezed out, leading to insufficient installation accuracy and leakage. Some pipes may not show leaks during installation but will leak over time. Therefore, under current circumstances, for larger diameter, higher flow rate pressurized water transmission, precast concrete pipes are generally not used; instead, more expensive steel pipes are employed.

[0004] Existing precast reinforced concrete pipe joints for pressurized water transmission projects suffer from quality control difficulties and are prone to leakage. The purpose of this invention is to overcome these shortcomings and provide a pipe joint construction method that utilizes a flat-joint strip copper sheet water-stop device for precast reinforced concrete circular pipe joints, which is cost-effective, easy and quick to construct, of high quality, durable, and leak-proof. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for pipe and pipe gallery joints to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a construction method for pipe and pipe gallery joints, comprising the following steps:

[0007] S1. Purchase copper sheets according to specifications and process them to manufacture Type A and Type B waterstops;

[0008] S2. Type A waterstop is processed into Type A copper rings by pressure treatment at the precast pipe factory;

[0009] S3. Construction of precast pipe type A copper ring: Pour the pipe concrete in the usual way, pre-embed one end of the type A copper ring in the concrete at both ends of the pipe, after the pipe concrete is poured and the curing period is over, remove the ring mold, bury one end of the type A copper ring in the joint concrete, and expose one end of the type A copper ring outside the joint concrete.

[0010] S4. Type B waterstop is processed and pressed into a Type B copper ring at the pipe joint inside the pipeline laying construction site;

[0011] S5. Set up a joint water-stop device: The pipe joint water-stop welding method is adopted. Type A copper ring - Type B copper ring - Type A copper ring are welded in sequence. After the welding is completed, an integral strip copper sheet water-stop device for the flat interface of the pipe joint is formed, which is the joint water-stop device.

[0012] S6. Joint sealing device protection: Inside the pipe joint seam, the outer wall of the copper sheet is embedded with asphalt mortar flexible filler, and the inner wall is sealed with asphalt fine stone concrete.

[0013] S7. Pressure test: After the pipe joints are installed, the pipes are pressure tested in sections. After the pressure test is passed, the trench is backfilled and the pipe laying is completed.

[0014] Preferably, the method for processing the Type A waterstop in S2 into a Type A copper ring by pressure forming at the precast pipe factory is as follows: during the installation of the precast pipe mold, one end of the processed strip-shaped steel sheet is fixed to the inner wall of the annular mold at both ends of the pipe, and the two ends of the Type A waterstop are welded into a circle to obtain the Type A copper ring. For pipes with smaller diameters, the same method can be used on the outer wall of the pipe joint.

[0015] Preferably, in step S3, pre-embedding one end of the type A copper ring in the concrete at both ends of the pipe and pouring it in also includes: embedding to a depth of 100mm, cutting and folding the end into a fishtail shape at 50mm intervals in the circumferential direction, and exposing 30mm of one end of the type A copper ring outside the joint concrete.

[0016] Preferably, the method for processing and pressing the Type B waterstop strip into a Type B copper ring at the pipe joint during pipeline laying is as follows: After trench excavation, the pipeline is laid, and the prefabricated pipeline is placed in the trench, centered, leveled, and straightened; a welder enters the placed pipeline and overlaps the processed strip-shaped copper sheet with the Type A rings at both ends of the pipe joint, welding the overlap to obtain the Type B copper ring. For pipelines with smaller diameters where entry is not possible, the same method can be used on the outer wall of the pipe joint.

[0017] Preferably, in the S5 pipeline laying process, 3-5 sections of pipeline are laid at a time. After centering, leveling, and straightening, the pipeline joint width is controlled to be 30mm, with an error range of ±5mm.

[0018] Preferably, the processed strip copper sheet in S4 is a strip copper sheet with a U-shaped middle, which is formed by conversion and processing, with a width of 120mm and a circumferential circumference determined according to the pipe diameter. The U-shaped copper sheet has a semi-circular arc in the middle of its width direction with a diameter of 20mm, and two flat wings with a width of 50mm each.

[0019] Preferably, the copper sheet in S1 conforms to the national standard GB / T2059-2008, has a thickness of 1-2 mm, a tensile strength of not less than 205 MPa, and an elongation of not less than 20%.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The flat-interface integral strip copper sheet water-stopping device and its pipe joint method created by the present invention can be used for long-distance pressure water transmission in precast reinforced concrete pipeline projects. The pipe joint will not leak, effectively solving the problem of water leakage in precast reinforced concrete pipe joints.

[0022] (2) The flat-interface integral strip copper sheet water-stop device in this invention has a large adaptability to the expansion and contraction deformation caused by uneven settlement of the pipeline foundation and temperature stress. Under normal circumstances, if the foundation is unevenly settled and the expansion and contraction deformation is within 20mm, the copper sheet water-stop device will not be damaged and the pipeline joint will not leak. Thus, it can adapt to the large expansion and contraction deformation caused by uneven settlement of the foundation and temperature stress.

[0023] (3) The flat joint pipe production method used in this invention has simpler tools and molds, simplified steel bar processing and installation procedures, lower production costs, and more convenient transportation.

[0024] (4) The precast reinforced concrete pipe with flat interface integral strip copper sheet water-stop device is used in this invention. It can adapt to certain errors during installation, so that the pipe joint installation is more convenient and the installation cost is lower.

[0025] (5) The precast reinforced concrete pipe with flat interface integral strip copper sheet water-stopping device has a long service life of 50-70 years, and the cost is 30-40% lower than that of steel pipe, cast iron pipe and PE pipe. In addition, its operation and maintenance costs are also low, thus saving costs. Attached Figure Description

[0026] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please see Figure 1 This invention provides a technical solution: a construction method for pipe and pipe gallery joints, comprising the following steps:

[0030] S1. Purchase copper sheets according to specifications and process them to manufacture Type A and Type B waterstops;

[0031] S2. Type A waterstop is processed into Type A copper rings by pressure treatment at the precast pipe factory;

[0032] S3. Construction of precast pipe type A copper ring: Pour the pipe concrete in the usual way, pre-embed one end of the type A copper ring in the concrete at both ends of the pipe, after the pipe concrete is poured and the curing period is over, remove the ring mold, bury one end of the type A copper ring in the joint concrete, and expose one end of the type A copper ring outside the joint concrete.

[0033] S4. Type B waterstop is processed and pressed into a Type B copper ring at the pipe joint inside the pipeline laying construction site;

[0034] S5. Set up a joint water-stop device: The pipe joint water-stop welding method is adopted. Type A copper ring - Type B copper ring - Type A copper ring are welded in sequence. After the welding is completed, an integral strip copper sheet water-stop device for the flat interface of the pipe joint is formed, which is the joint water-stop device.

[0035] S6. Joint sealing device protection: Inside the pipe joint seam, the outer wall of the copper sheet is embedded with asphalt mortar flexible filler, and the inner wall is sealed with asphalt fine stone concrete.

[0036] S7. Pressure test: After the pipe joints are installed, the pipes are pressure tested in sections. After the pressure test is passed, the trench is backfilled and the pipe laying is completed.

[0037] In this embodiment, preferably, the method for processing the Type A waterstop in S2 into a Type A copper ring by pressure processing at the prefabrication pipe factory is as follows: when installing the prefabrication pipe mold, one end of the processed strip-shaped steel sheet is fixed to the outer wall of the circular mold at both ends of the pipe, and the two ends of the Type A waterstop are welded into a circle to obtain the Type A copper ring.

[0038] In this embodiment, preferably, step S3, which involves pre-embedding one end of the type A copper ring in the concrete at both ends of the pipe, further includes: embedding to a depth of 100mm, cutting and folding the end into a fishtail shape at 50mm intervals in the circumferential direction, and exposing one end of the type A copper ring to the concrete of the joint for 30mm.

[0039] In this embodiment, preferably, the method for processing and pressing the Type B waterstop strip in S4 into a Type B copper ring at the pipe joint at the pipeline laying construction site is as follows: after the trench is excavated, the pipeline is laid, the prefabricated pipeline is placed in the trench, and it is centered, leveled, and straightened; the welder enters the placed pipeline and overlaps the processed strip-shaped copper sheet with the Type A rings at both ends of the pipeline joint, and the overlap joint is welded to obtain the Type B copper ring.

[0040] In this embodiment, preferably, 3-5 sections of pipe are laid at a time in the S5 pipe laying process. After centering, leveling and straightening, the pipe joint width is controlled to be 30mm, with an error range of ±5mm.

[0041] In this embodiment, preferably, the processed strip copper sheet in S4 is a strip copper sheet with a U-shaped middle, which is formed by conversion and processing, with a width of 120mm and a circumferential circumference determined according to the pipe diameter. The U-shaped copper sheet has a semi-circular arc in the middle of its width direction with a diameter of 20mm, and the two wings are flat with a width of 50mm each.

[0042] In this embodiment, preferably, the welding method in S5 specifically includes:

[0043] S501. Welding wire and gas welding flux: Cut strips of copper waterstop base material are used, and deoxidizer is placed in welding powder. The welding powder is gas flux 301.

[0044] S502. Gas welding process: Before welding, clean the welding wire and the workpiece, and use a wire brush or sandpaper to remove surface oil and adsorbed gas.

[0045] S503. Welding flame: Use a neutral flame. An oxidizing flame will oxidize the molten pool and form brittle cuprous oxide in the weld. A carburizing flame will produce carbon monoxide and hydrogen, which will enter the weld and form pores.

[0046] S504. Preheating of the workpiece: Before welding, the workpiece should be preheated at a temperature of 400-500℃.

[0047] In this embodiment, preferably, the copper sheet in S1 conforms to the national standard GB / T2059-2008, has a thickness of 1-2 mm, a tensile strength of not less than 205 MPa, and an elongation of not less than 20%.

[0048] In this embodiment, preferably, the asphalt mortar flexible filler in S6 comprises the following raw material composition by weight: 30 parts asphalt and 30 parts mortar. The mortar comprises the following raw material composition by weight: 30 parts cement, 20 parts sand, 2 parts organic binder, 10 parts active filler, 3 parts shrinkage reducer, 0.2 parts water reducer, 0.1 parts early strength agent, and 20 parts water.

[0049] In this embodiment, preferably, the organic binder is vinyl acetate, the active filler is spherical metakaolin with high pozzolanic activity, the shrinkage reducing agent is a polyether or polyol organic shrinkage reducing agent, the water reducing agent is sulfonated melamine-formaldehyde resin, and the early strength agent is calcium formate early strength agent.

[0050] Example 2

[0051] The difference from Example 1 is as follows:

[0052] The flexible filler for asphalt mortar in S6 comprises the following raw materials in parts by weight: 50 parts asphalt and 50 parts mortar. The mortar comprises the following raw materials in parts by weight: 50 parts cement, 40 parts sand, 4 parts organic binder, 25 parts active filler, 10 parts shrinkage reducer, 0.5 parts water reducer, 1 part early strength agent, and 50 parts water.

[0053] Example 3

[0054] The difference from Example 1 is as follows:

[0055] The flexible filler for asphalt mortar in S6 comprises the following raw materials in parts by weight: 40 parts asphalt and 40 parts mortar. The mortar comprises the following raw materials in parts by weight: 40 parts cement, 30 parts sand, 3 parts organic binder, 15 parts active filler, 7 parts shrinkage reducer, 0.4 parts water reducer, 0.5 parts early strength agent, and 30 parts water.

[0056] The principles and advantages of this invention:

[0057] (1) The flat-interface integral strip copper sheet water-stopping device and its pipe joint method created by the present invention can be used for long-distance pressure water transmission in precast reinforced concrete pipeline projects. The pipe joint will not leak, effectively solving the problem of water leakage in precast reinforced concrete pipe joints.

[0058] (2) The flat-interface integral strip copper sheet water-stop device in this invention has a large adaptability to the expansion and contraction deformation caused by uneven settlement of the pipeline foundation and temperature stress. Under normal circumstances, if the foundation is unevenly settled and the expansion and contraction deformation is within 20mm, the copper sheet water-stop device will not be damaged and the pipeline joint will not leak. Thus, it can adapt to the large expansion and contraction deformation caused by uneven settlement of the foundation and temperature stress.

[0059] (3) The flat joint pipe production method used in this invention has simpler tools and molds, simplified steel bar processing and installation procedures, lower production costs, and more convenient transportation.

[0060] (4) The precast reinforced concrete pipe with flat interface integral strip copper sheet water-stop device is used in this invention. It can adapt to certain errors during installation, so that the pipe joint installation is more convenient and the installation cost is lower.

[0061] (5) The precast reinforced concrete pipe with flat interface integral strip copper sheet water-stopping device has a long service life of 50-70 years, and the cost is 30-40% lower than that of steel pipe, cast iron pipe and PE pipe. In addition, its operation and maintenance costs are also low, thus saving costs.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for pipe and pipe gallery joints, characterized in that: Includes the following steps: S1. Purchase copper sheets according to specifications and process them to manufacture Type A and Type B waterstops; S2. Type A waterstop is processed into Type A copper rings by pressure treatment at the precast pipe factory; S3. Construction of precast pipe type A copper ring: Pour the pipe concrete in the usual way, pre-embed one end of the type A copper ring in the concrete at both ends of the pipe, after the pipe concrete is poured and the curing period is over, remove the ring mold, bury one end of the type A copper ring in the joint concrete, and expose one end of the type A copper ring outside the joint concrete. S4. Type B waterstop is processed and pressed into a Type B copper ring at the pipe joint inside the pipeline laying construction site; S5. Set up a joint water-stop device: The pipe joint water-stop welding method is adopted. Type A copper ring - Type B copper ring - Type A copper ring are welded in sequence. After the welding is completed, an integral strip copper sheet water-stop device for the flat interface of the pipe joint is formed, which is the joint water-stop device. S6. Joint sealing device protection: Inside the pipe joint seam, the outer wall of the copper sheet is embedded with asphalt mortar flexible filler, and the inner wall is sealed with asphalt fine stone concrete. S7. Pressure test: After the pipe joints are installed, the pipes are pressure tested in sections. After the pressure test is passed, the trench is backfilled and the pipe laying is completed.

2. The construction method for a pipe or pipe gallery joint according to claim 1, characterized in that: The method for producing the Type A waterstop in S2 by pressure processing in the prefabrication pipe factory into a Type A copper ring is as follows: when installing the prefabrication pipe mold, one end of the processed strip of purple steel sheet is fixed to the outer wall of the circular mold at both ends of the pipe, and the two ends of the Type A waterstop are welded into a circle to obtain the Type A copper ring.

3. The construction method for a pipe or pipe gallery joint according to claim 1, characterized in that: The S3 method of pre-embedding one end of the type A copper ring in the concrete at both ends of the pipe also includes: embedding to a depth of 100mm, cutting and folding the end into a fishtail shape at 50mm intervals in the circumferential direction, and exposing 30mm of one end of the type A copper ring outside the joint concrete.

4. The construction method for a pipe or pipe gallery joint according to claim 1, characterized in that: The method for processing and pressing the Type B waterstop strip in S4 into a Type B copper ring at the pipe joint on the pipeline laying construction site is as follows: After the trench is excavated, the pipeline is laid, and the prefabricated pipeline is placed in the trench, centered, leveled, and straightened; the welder enters the placed pipeline and overlaps the processed strip-shaped copper sheet with the Type A rings at both ends of the pipe joint, and welds the overlap joint to obtain the Type B copper ring.

5. The construction method for a pipe or pipe gallery joint according to claim 4, characterized in that: In the S5 pipeline laying process, 3-5 sections of pipeline are laid at a time. After centering, leveling, and straightening, the pipeline joint width is controlled to be 30mm, with an error range of ±5mm.

6. The construction method for a pipe or pipe gallery joint according to claim 4, characterized in that: The processed strip of copper in S4 is a U-shaped strip of copper, which is formed by conversion and processing. The width is 120mm and the circumference is determined according to the pipe diameter. The U-shaped copper strip has a semi-circular arc in the middle of its width direction with a diameter of 20mm, and the two wings are flat with a width of 50mm each.

7. The construction method for a pipe or pipe gallery joint according to claim 1, characterized in that: The copper sheet in S1 conforms to the national standard GB / T2059-2008, with a thickness of 1-2 mm, a tensile strength of not less than 205 MPa, and an elongation of not less than 20%.

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