Construction method of make-up water pipe transformation project

Abstract

According to the construction method of the make-up water pipe reconstruction project, by means of deep fusion of three-dimensional modeling laser scanning and a geographic information system, the existing pipe and surrounding conditions are accurately surveyed, a route is scientifically planned, and the construction risk and the change possibility are reduced; and when the old pipe is dismantled, the flexible airtight packing cabin is matched with colloid injection to ingeniously stop water in a segmented mode, orderly cutting is matched, the pipe section is safely dismantled, blasting hazards are avoided, and the dismantling efficiency is improved. When the new pipe is laid, the damping and noise reduction cushion layers are arranged in the grooves, the external force resistance of the new pipe is enhanced, fine verification is conducted after sealing connection, and the laying precision and quality are guaranteed. After new pipe connection is completed, tracer particle water is injected, deep inspection is conducted, segmented pressure testing is combined, hidden danger all-around troubleshooting is conducted, repairing and perfecting are conducted in advance, the reliability of the new pipe is greatly improved, the construction efficiency, quality and water supply long-term stability of a make-up water pipe modification project are remarkably improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water pipe reconstruction, and in particular to a construction method for a replenishment water pipe reconstruction project. Background Art

[0002] With the development and expansion of the city, the existing water supply network is increasingly unable to meet the growing water demand, water supply stability, and water quality safety requirements due to many factors such as its long history and limited planning and layout. When laying the early water supply pipes, they were mostly limited by the technical conditions, capital investment, and survey level at the time. There was an unreasonable line planning, which resulted in insufficient water supply pressure and large water loss in some areas, seriously affecting water supply efficiency.

[0003] Traditional water supply pipe reconstruction construction faces multiple difficulties. The preliminary survey relies on manual field measurement and drawing review, which is inefficient and has large errors. It is difficult to accurately clarify the complex three-dimensional direction of the existing water pipes, the details of the buried depth, and the spatial relationship with surrounding buildings and crisscrossing underground pipelines, resulting in the subsequent reconstruction planning being highly arbitrary and having many safety hazards. Blasting or simple mechanical cutting is often used for pipe section removal. The blasting vibration endangers the surrounding facilities and disturbs the soil. Mechanical cutting is difficult to stop water and has low efficiency when encountering complex pipe sections. When laying new pipes, the groove treatment is simple and lacks effective shock absorption protection. The quality of pipe joint connection sealing is unstable and the verification is rough, which affects the durability and sealing of the pipeline. Moreover, after the new pipes are laid, the debugging and inspection methods are single, mostly simple appearance inspection and basic water flow test, which makes it difficult to find subtle internal defects and hidden leakage points. Failures occur frequently after commissioning, with high maintenance costs and poor water supply stability. In short, there is no existing technology that can standardize the transformation of water supply pipes. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a water supply pipe reconstruction project to achieve standardized reconstruction of the water supply pipe.

[0005] A construction method for a water supply pipe reconstruction project comprises the following steps:

[0006] S1: Preliminary survey and planning: Use 3D modeling laser scanning technology to conduct a full-scale scan of the existing water supply pipeline and the surrounding environment to obtain accurate 3D model data. Based on this data and combined with the geographic information system, analyze the direction, burial depth, diameter change of the existing water pipes, and the spatial position relationship with surrounding buildings and various underground pipelines. Based on the analysis results, formulate a reconstruction route planning map;

[0007] S2: Pipe segment removal: After determining the location of the pipe segment to be removed, multiple flexible closed isolation chambers are equidistantly arranged along the axial direction of the pipe segment, and curable colloid is injected into the isolation chambers to block the water flow in the removed pipe segment in sections. After that, the pipe segment is cut and removed in sequence;

[0008] S3: Laying of new pipes: Dig new pipe trenches according to the planning drawings, lay shock-absorbing and noise-reducing elastic cushions at the bottom of the trenches, and then seal and connect multiple pipes in sequence. After connection, perform straightness checks and adjustments;

[0009] S4: After the new pipe is laid and connected, firstly, clean water with tracer particles is slowly injected into the pipe section by section to conduct a comprehensive inspection of the internal structural integrity, weld quality and sealing of the connection parts with the existing pipe section of the new pipe. According to the inspection results, the problematic parts are repaired and improved in time;

[0010] S5: Conduct pressure testing on the pipeline in sections.

[0011] Furthermore, in step S1: when scanning using the three-dimensional modeling laser scanning technology, the scanning point spacing does not exceed 5 mm, and during the scanning process, the global positioning system is combined to obtain the scanning position coordinate information in real time.

[0012] Furthermore, the reconstruction route planning map includes the new pipe laying path, key nodes to be avoided and the optimal solution for connecting existing pipe sections.

[0013] Furthermore, in step S2, the pipe section is cut section by section by a water jet or a rope saw, and the temperature of the cutting part is monitored in real time by a temperature sensor during the cutting process. When the temperature exceeds a preset safety range, the cutting is suspended and the temperature is lowered. During the cutting process, a drainage device is used to simultaneously drain the residual water in the sealed compartment.

[0014] Furthermore, in step S3, the thickness of the shock-absorbing and noise-reducing elastic cushion layer is not less than 10 cm, and a waterproof and breathable film is also laid between the elastic cushion layer and the new pipe.

[0015] Furthermore, the elastic cushion layer is made by mixing waste tire particles and polyurethane elastomer.

[0016] Furthermore, in step S3, the new pipe is a multi-layer composite pipe, which comprises, from the inside to the outside, a corrosion-resistant polyvinyl chloride layer, a wire mesh reinforcement layer and an ultraviolet-proof polyethylene layer.

[0017] Furthermore, in step S3, electromagnetic induction heating sealing rings are used to seal adjacent pipe joints, the sealing temperature is controlled between 200-250°C, the sealing time does not exceed 10 minutes, and after the sealing is completed, an infrared thermal imager is used to perform thermal imaging detection on the sealing part.

[0018] Furthermore, in step S5, when the pressure test is carried out in sections, the test length of each section shall not be greater than 1.0 km, and the test pressure is 1.2 MPa.

[0019] Furthermore, when the new pipe is connected, an air valve is installed at the raised point of the pipeline and a mud valve is installed at the low-lying part; valves are installed every 500 meters in the straight section of the pipeline.

[0020] The beneficial effects of this technical solution are: this method uses the deep integration of three-dimensional modeling laser scanning and geographic information system to accurately survey the existing pipes and surrounding conditions, scientifically plan routes, and reduce construction risks and possible changes; when dismantling old pipes, a flexible closed isolation cabin is used with colloid injection to cleverly stop water in sections, and orderly cutting is used to safely dismantle the pipe sections, avoid blasting hazards, and improve dismantling efficiency. When laying new pipes, a shock-absorbing and noise-reducing cushion layer is installed in the groove to enhance the new pipe's ability to resist external forces. After the sealing connection, a detailed check is carried out to ensure the laying accuracy and quality. After the new pipe is connected, tracer particle water is injected and deeply inspected. Combined with segmented pressure testing, hidden dangers are checked in all directions, repaired and improved in advance, which greatly enhances the reliability of the new pipe, significantly improves the construction efficiency, quality and long-term stability of water supply of the replenishment water pipe renovation project, and reduces operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a flow chart of the construction method of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1 As shown, the present invention provides a construction method for a replenishment water pipe reconstruction project, comprising the following steps:

[0028] Step 1: Preliminary survey and planning: Use 3D modeling laser scanning technology to conduct a full-scale scan of the existing water supply pipeline and the surrounding environment to obtain accurate 3D model data. Based on this data, combine with the geographic information system to analyze the direction, burial depth, diameter change of the existing water pipe, and the spatial position relationship with surrounding buildings and various underground pipelines. Based on the analysis results, formulate a renovation route planning map, which includes the new pipe laying path, key nodes that need to be avoided, and the optimal solution for connecting existing pipe sections; Among them: When scanning using 3D modeling laser scanning technology, the scanning point spacing does not exceed 5mm to ensure that the collected data is dense enough, and during the scanning process, combine with the global positioning system to obtain real-time scanning position coordinate information to improve the 3D model accuracy and positioning accuracy.

[0029] Step 2: Pipe section removal: After determining the position of the pipe section to be removed, multiple flexible sealed compartments are equidistantly arranged along the axial direction of the pipe section. The flexible sealed compartment adopts a composite structure of high-strength rubber and metal frame. The high-strength rubber is coated on the outside of the metal frame, can adapt to the irregular inner wall of the pipe section and is sealed and waterproof. An injection port is reserved on the top, and a curable colloid is injected into the compartment to solidify it within a preset time to form a rigid support body, thereby blocking the water flow in the removed pipe section in sections. After that, non-explosive cold cutting equipment, such as a water jet or a rope saw, is used to cut and remove the pipe section in sequence, and the temperature of the cutting part is monitored in real time by a temperature sensor during the cutting process. When the temperature exceeds the preset safety range, the cutting is suspended and the cooling treatment is performed. During the cutting process, the residual water in the compartment is simultaneously pumped out by a drainage device.

[0030] Step 3: Laying of new pipes: Dig trenches for new pipes according to the planning drawings, lay shock-absorbing and noise-reducing elastic cushions at the bottom of the trenches, the thickness of which should be no less than 10 cm, and lay waterproof and breathable films between the elastic cushions and the new pipes to prevent groundwater from penetrating and corroding the new pipes while ensuring that the cushions’ buffering properties can be effectively utilized; the new pipes are made of multi-layer composite pipes, which consist of a corrosion-resistant polyvinyl chloride layer, a wire mesh reinforcement layer, and an anti-ultraviolet polyethylene layer from the inside to the outside. Electromagnetic induction heating sealing rings are used for sealing when the pipes are butt-jointed. The electromagnetic induction heating sealing rings have built-in induction coils, which excite induced currents through external alternating magnetic fields to generate heat themselves, thereby achieving fast and efficient sealed connections of pipe sections, and the electromagnetic induction heating sealing rings heat the seals During the sealing process, the sealing temperature is controlled between 200-250℃, the sealing time is not more than 10 minutes, and after the sealing is completed, the sealing part is thermally imaged and detected with an infrared thermal imager to ensure uniform and reliable sealing quality; after connection, the intelligent straightening equipment is used to perform real-time straightness verification and adjustment of the laid new pipe based on laser guidance; when the new pipe is connected, an air valve is installed at the bulge of the pipeline to remove the air accumulated in the pipe, and air is allowed to enter when the pipeline needs to be inspected or emptied to keep the water drainage unobstructed. At the same time, when water hammer occurs, visible air can automatically enter to avoid negative pressure; a mud discharge valve is installed in the low-lying area, and the mud discharge valve is installed in the valve well. Whether to set up a mud discharge wet well and an overflow pipe is decided according to the situation of the drainage outlet on site. Valves are installed every 500 meters on the straight section of the pipeline; the valves are used to adjust the flow and water pressure in the pipeline, and to cut off damaged pipe sections during accident maintenance to reduce large-scale water outages caused by local pipeline failures and improve the water supply safety of the pipeline network; in order to facilitate maintenance and management, maintenance valve wells are installed at the branch pipe outlets of the pipeline, and the valve wells adopt a brick structure.

[0031] Step 4: After the new pipe is laid and connected, first slowly inject clean water with tracer particles into the pipe in sections, and use high-precision flow sensors and pressure sensors to monitor water flow and pressure changes. At the same time, you can use a pipeline endoscopy robot equipped with a high-definition camera and an ultrasonic flaw detector. With the help of the fluorescent characteristics of the tracer particles, it is convenient to use the camera to capture its traces, clearly display the water flow path and diffusion, locate the leakage and blockage of the pipeline, and conduct a comprehensive inspection of the internal structural integrity, weld quality and sealing of the connection parts with the existing pipe sections of the new pipe. According to the inspection results, the problematic parts are repaired and improved in time until all indicators of the entire water supply pipe system meet the design specifications. Among them: the pipeline endoscopy robot travels at a speed of no more than 0.5m / s in the pipe, and can automatically stop when a suspected abnormal part is detected, collect images and ultrasonic data from multiple angles, and transmit them wirelessly in real time to the ground monitoring terminal for technical personnel to analyze and judge. The pipeline endoscopy robot is an existing technology and will not be described here.

[0032] Step 5: Perform section-by-section pressure test on the installed new pipe; during section-by-section pressure test, the pressure gauge is placed at the lowest point of the pipeline to display the highest pressure of the section; the test length of each section shall not exceed 1.0 km, and the test pressure is 1.2 Mpa. Attention should be paid to the following when conducting water pressure test: Before the test, the design of water source connection and drainage route should be done well, and water should be slowly poured from the downstream of the pipeline to remove the gas in the pipeline; during pressure test, the pressure should be increased in stages, and the back, pier, pipe body and interface should be checked at each level. If there is no abnormality, the pressure should be increased; after the water pressure rises to the test pressure, the constant pressure should be maintained for 10 minutes, and the interface and pipe body should be checked for damage and water leakage.

[0033] Finally, flush and disinfect the pipes, and flush them continuously with flushing water at a flow rate of not less than 1m / s until the turbidity and chromaticity at the outlet are the same as those at the inlet. After flushing, soak the pipes in clean water with a chloride ion concentration of not less than 20mg / L for 24 hours and then flush them again.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a water supply pipe reconstruction project, characterized in that: The following steps are involved: S1: Preliminary survey and planning: Use 3D modeling laser scanning technology to conduct a full-scale scan of the existing water supply pipeline and the surrounding environment to obtain accurate 3D model data. Based on this data and combined with the geographic information system, analyze the direction, burial depth, diameter change of the existing water pipes, and the spatial position relationship with surrounding buildings and various underground pipelines. Based on the analysis results, formulate a reconstruction route planning map; S2: Pipe segment removal: After determining the location of the pipe segment to be removed, multiple flexible closed isolation chambers are equidistantly arranged along the axial direction of the pipe segment, and curable colloid is injected into the isolation chambers to block the water flow in the removed pipe segment in sections. After that, the pipe segment is cut and removed in sequence; S3: Laying of new pipes: Dig new pipe trenches according to the planning drawings, lay shock-absorbing and noise-reducing elastic cushions at the bottom of the trenches, and then seal and connect multiple pipes in sequence. After connection, perform straightness checks and adjustments; S4: After the new pipe is laid and connected, firstly, clean water with tracer particles is slowly injected into the pipe section by section to conduct a comprehensive inspection of the internal structural integrity, weld quality and sealing of the connection parts with the existing pipe section of the new pipe. According to the inspection results, the problematic parts are repaired and improved in time; S5: Conduct pressure testing on the pipeline in sections.

2. The construction method of the water supply pipe reconstruction project according to claim 1 is characterized in that: In step S1: when scanning using the 3D modeling laser scanning technology, the scanning point spacing does not exceed 5 mm, and during the scanning process, the global positioning system is combined to obtain the scanning position coordinate information in real time.

3. The construction method of the water supply pipe reconstruction project according to claim 1 is characterized in that: In step S1, the reconstruction route planning map includes the new pipe laying path, key nodes to be avoided, and the optimal solution for connecting existing pipe sections.

4. The construction method of the water supply pipe reconstruction project according to claim 1 is characterized in that: In step S2, the pipe section is cut section by section by a water jet or a rope saw, and the temperature of the cutting part is monitored in real time by a temperature sensor during the cutting process. When the temperature exceeds a preset safety range, the cutting is suspended and the temperature is lowered; During the cutting process, the drainage device is used to simultaneously pump out the residual water in the sealed compartment.

5. The construction method of the water supply pipe reconstruction project according to claim 4 is characterized in that: In step S3, the thickness of the shock-absorbing and noise-reducing elastic cushion layer is not less than 10 cm, and a waterproof and breathable film is also laid between the elastic cushion layer and the new pipe.

6. The construction method of the water supply pipe reconstruction project according to claim 5 is characterized in that: The elastic cushion layer is made by mixing waste tire particles and polyurethane elastomer.

7. The construction method of the water supply pipe reconstruction project according to claim 1 is characterized in that: In step S3, the new pipe is a multi-layer composite pipe, which comprises, from the inside to the outside, a corrosion-resistant polyvinyl chloride layer, a steel wire mesh reinforcement layer and an ultraviolet-proof polyethylene layer.

8. The construction method of the water supply pipe reconstruction project according to claim 1 is characterized in that: In step S3, the adjacent pipe joints are sealed using electromagnetic induction heating sealing rings, the sealing temperature is controlled between 200-250°C, the sealing time does not exceed 10 minutes, and after the sealing is completed, the sealing part is thermally imaged using an infrared thermal imager.

9. The construction method of the water supply pipe reconstruction project according to claim 1, characterized in that: In step S5, when the pressure test is carried out in sections, the test length of each section shall not be greater than 1.0 km, and the test pressure is 1.2 MPa.

10. The construction method of the water supply pipe reconstruction project according to claim 1, characterized in that: When connecting a new pipe, an air valve is installed at the raised point of the pipeline and a mud discharge valve is installed at the low-lying area; valves are installed every 500 meters on the straight section of the pipeline.

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