Combined construction method of steel pipe dragging and jacking in double-channel pipe jacking across wide road

Abstract

The application provides a double-channel steel pipe dragging and jacking construction method for crossing wide roads, which comprises reinforced concrete pipe jacking construction, steel pipe dragging construction and steel pipe jacking construction in sequence. The application increases the steel pipe dragging process, improves the construction efficiency, shortens the construction period, ensures safety, saves cost, is suitable for nearly straight double-pipe pipe jacking steel pipe construction, and is especially suitable for pipe jacking steel pipe construction with large pipe line length and small slope.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and in particular to a construction method combining double-track pipe jacking with internal steel pipe dragging and jacking for crossing wide highways. Background Technology

[0002] When water pipelines cross highways, pipe jacking is often used. This method can protect the highway and ensure smooth water flow. The common method is to use an outer reinforced concrete sleeve for protection, with a steel pipe running through the inside of the reinforced concrete sleeve to carry the water. At the same time, to ensure water supply safety, a double pipeline configuration is often used to cross the highway.

[0003] Due to highway safety requirements, two jacking machines are not allowed to be used simultaneously inside the working shaft, and the outer casing jacking must be completed as quickly as possible to prevent cracks or collapses in the highway. The traditional construction method involves first jacking the first layer of reinforced concrete casing, then the second layer, followed by jacking the second layer with an internal steel pipe, and finally jacking the first layer with an internal steel pipe. This entire construction process is a continuous flow operation, resulting in long construction intervals, low equipment utilization, low efficiency, long construction periods, and high costs. Summary of the Invention

[0004] To address the aforementioned issues, this invention discloses a combined construction method for double-track pipe jacking with internal steel pipe dragging and jacking across wide highways. By adding an internal steel pipe dragging process, it improves construction efficiency, shortens the construction period, ensures safety, and saves costs. It is applicable to the construction of internal pipe jacking in near-straight double-pipe systems with internal pipes, and is especially suitable for internal pipe jacking construction in systems with long pipelines and gentle slopes.

[0005] The specific plan is as follows:

[0006] The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined for crossing wide highways is characterized by comprising, in sequence: reinforced concrete pipe jacking construction, internal steel pipe dragging construction, and internal steel pipe jacking construction.

[0007] As a further improvement of the present invention, the reinforced concrete pipe jacking construction includes, in sequence: construction preparation; surveying and setting out; setting out verification; installation of working shaft equipment; preparation for entering the tunnel; mud discharge; advancing; surveying and directional correction; pipe hoisting and installation; pipe jacking; preparation for exiting the tunnel; removal of the tunneling machine and auxiliary equipment; completion of the pipe jacking construction of this section, wherein before advancing, the construction also includes, in sequence, the installation of ground equipment, grouting material equipment, and grouting.

[0008] As a further improvement of the present invention, the internal steel pipe towing construction includes, in sequence: installation of track and towing equipment; pipe hoisting, installation and welding; inspection; towing; repeated hoisting, welding and towing work; completion of work and removal of equipment.

[0009] As a further improvement of the present invention, the internal steel pipe jacking construction includes, in sequence: jacking equipment installation; pipe hoisting, installation, and welding; inspection; jacking; repeated hoisting, welding, and dragging work; completion of work and removal of equipment.

[0010] As a further improvement of the present invention, the construction preparation specifically includes: preparation of the ground platform for the working shaft and receiving shaft and preparation of the platform inside the shaft. Specifically, the preparation of the ground platform for the working shaft and receiving shaft includes: water and electricity installation, site leveling, arrangement of mud pits, protection of enclosures and disposal of excavated soil, etc.; the preparation of the platform inside the shaft includes: erection of the working platform, arrangement and installation of jacking equipment, erection of upper and lower passages and protective measures for entering and exiting the tunnel, etc.

[0011] The construction requirements include: control of raw materials, inspection of jacking / pulling equipment, and process control. Specifically, raw material control involves timely inspection and testing of all raw materials (pipes) upon arrival on site; jacking work can only commence after the materials have passed inspection. Inspection of the jacking / pulling equipment involves a comprehensive inspection of the entire equipment after installation, ensuring all data meet requirements, and that the laid pipes comply with construction and environmental protection requirements. Process control specifically includes ensuring that jacking pressure and speed, and the gaps in the concrete sleeve connections, meet relevant requirements.

[0012] As a further improvement of the present invention, the construction process of the internal steel pipe is as follows: After the first (left) reinforced concrete sleeve jacking construction is completed, the jacking machine is hoisted to the second (right) for jacking construction, while the first pipeline is prepared for internal steel pipe installation and subsequent construction; the specific process is as follows: construction preparation → installation of steel pulley bracket and winch → steel pipe acceptance → steel pipe hoisting into the welding trench → steel pipe welding → steel pipe weld inspection → steel pipe outer seam anti-corrosion → inspection and acceptance → winch dragging steel pipe → repeat the above dragging steps → after the pipeline dragging length exceeds the limit distance, jacking construction is changed → jacking equipment relocation, winch relocation → steel pipe hoisting into the welding trench → steel pipe welding → steel pipe weld inspection → steel pipe outer seam anti-corrosion → inspection and acceptance → jacking equipment jacking steel pipe → repeat the above jacking steps → steel pipe jacking completed and accepted → concrete sleeve end sealing → reinforced concrete sleeve inner circumferential M10 cement mortar pouring → water pressure test → steel pipe internal anti-corrosion construction.

[0013] As a further improvement of the present invention, the equipment for pulling and jacking the internal steel pipe includes (taking an internal steel pipe with an inner diameter of ∅1200 (casing ∅1600) as an example): a steel pipe pulling lug and a steel pulley bracket. The steel pipe pulling lug is arranged within a 30° range inside the bottom of the first section of the steel pipe, and is welded with 2.0cm thick steel plate. One lug is arranged on each of the left and right sides. The steel pulley bracket is made of 50*50mm square steel (pipe) and is longitudinally fixed to the inside of the reinforced concrete casing by expansion bolts. The track width is 30cm. Every 80cm between the two longitudinal square steel bars, a ∅22 steel bar is used to connect them and weld them through the two bearings (pulleys).

[0014] As a further improvement to this invention, the hoisting of the steel pipe is specifically as follows: After the steel pipe is transported to the construction site, it is inspected according to procedures; after passing the inspection, a 25t truck crane is used to unload the pipe; during the steel pipe construction, a steel pipe welding platform is prepared. The welding platform is located inside the working well, with a platform length of 10m, and is welded from 22# channel steel and 8mm steel plates. The platform has reserved trenches (working pits) for welding and anti-corrosion construction; the platform elevation must be strictly controlled to ensure that the steel pipe axis elevation meets the design requirements; the 25t truck crane is used to transport the hoisted steel pipe to the pipeline design location or the already installed pipeline location, ready for installation and connection; when the pipe fittings are moved, to prevent connection In case of collision, moving pipe fittings should be operated slowly and smoothly; the welding and inspection of steel pipes are as follows: steel pipe welding adopts carbon dioxide gas shielded welding, and the bottom weld is carried out in the welding work pit reserved on the steel pipe installation platform; according to design and specification requirements, the internal quality inspection of the weld is carried out by a combination of ultrasonic non-destructive testing and X-ray testing; the external corrosion protection of steel pipes is as follows: the external corrosion protection of steel pipes is carried out after the welding of a section of steel pipe is completed. The corrosion protection material adopts solvent-free heavy-duty anti-corrosion coating. The coating is composed of a two-component solvent-free special quick-drying coating based on epoxy resin or modified epoxy resin, and a modified amine curing agent; the thickness of the anti-corrosion layer of the jacking pipe is not less than 900μm.

[0015] As a further improvement of the present invention, the dragging / jacking of the steel pipe is specifically as follows: after the welding of the first and second sections of the steel pipe is completed and they pass inspection and acceptance in other processes, a winch is used to pull these two sections of the steel pipe, so that the second section of the steel pipe moves to the position of the first section (starting position). Then, the third section of the steel pipe is installed and welded. After the third section of the steel pipe is welded and inspected and passed, these three sections of the steel pipe are pulled, so that the third section of the steel pipe moves to the position of the first section (starting position), and so on. Since the distance between the winch (receiving well) and the steel pipe welding (working well) is large, in order to ensure construction safety during the dragging of the steel pipe, the two working faces are communicated with each other using walkie-talkies. When the length of the dragged pipe exceeds a certain length, in order to ensure safety, the dragging is changed to the jacking method.

[0016] As a further improvement of the present invention, the end sealing of the jacking pipe is specifically as follows: the end is sealed with 12mm red bricks. After the steel pipe is jacked into place, the gap between the steel pipe and the reinforced concrete jacking pipe is sealed with a plug. The very end of the plug is finished with M10 cement mortar. The circumferential cement mortar pouring inside the reinforced concrete jacking pipe is specifically as follows: the circumferential cement mortar inside the reinforced concrete jacking pipe has a strength of M10 and is self-mixed. After the mortar is fully mixed, a BW-200 pressure-reducing pump is used to grout the reserved holes on the pipe sections one by one through the main pipe, branch pipes, and ball valves. The grouting hole pressure is 50-80Kpa, and the grouting flow rate is controlled at 7-10L / min. During the grouting process, the grout is stirred slowly and continuously for a time shorter than the initial setting time of the grout. The grout is filtered through a screen before pumping. The internal corrosion protection of the steel pipe is specifically as follows: after the welding quality of the steel pipe passes the pressure test, rust removal and internal anti-corrosion mortar lining are carried out.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The equipment is installed by making full use of the limited space in the working shaft and receiving shaft, thus maximizing the equipment utilization rate;

[0019] 2. The addition of the internal steel pipe dragging process, combined with the jacking process, shortened the construction interval time, thereby improving construction efficiency and reducing construction costs.

[0020] 3. The construction noise is low, the surface excavation is small, and it will not have an impact on the environment and traffic. It is suitable for underground pipeline construction that crosses obstacles such as highways, railways, rivers, and ground buildings.

[0021] 4. Applicable to near-straight pipe jacking construction for medium and small diameter pipes. Attached Figure Description

[0022] Figure 1 This is a flowchart of the reinforced concrete pipe jacking construction process in this invention.

[0023] Figure 2 This is a flowchart of the internal steel pipe dragging construction process in this invention.

[0024] Figure 3 This is a flowchart of the internal steel pipe jacking construction process in this invention.

[0025] Figure 4 This is a schematic diagram of the arrangement of the internal steel pipe drag and steel pulley bracket.

[0026] Figure 5 This is a schematic diagram of steel pipe dragging construction.

[0027] Figure 6 This is a schematic diagram of steel pipe jacking construction.

[0028] Figure 7 On-site construction flow chart.

[0029] List of reference numerals in the attached diagram:

[0030] 1-Concrete jacking pipe, 2-Steel pipe, 3-Mortar, 4-Transport roller, 5-Railway, 6-Wire rope, 7-Welding pit, 8-Operating platform, 9-Jack, 10-Back wall, 11-Front beam. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] like Figure 1-3 As shown, the construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined for crossing a wide highway is characterized by comprising, in sequence: reinforced concrete pipe jacking construction, internal steel pipe dragging construction, and internal steel pipe jacking construction.

[0033] In this embodiment, the reinforced concrete pipe jacking construction includes, in sequence: construction preparation; surveying and setting out; setting out verification; installation of working shaft equipment; preparation for entering the tunnel; mud discharge; advancing; surveying and directional correction; pipe hoisting and installation; pipe jacking; preparation for exiting the tunnel; removal of the tunneling machine and auxiliary equipment; completion of this section of pipe jacking construction. Before advancing, the construction also includes, in sequence, the installation of ground equipment, grouting material equipment, and grouting.

[0034] In this embodiment, the internal steel pipe towing construction includes, in sequence: installation of track and towing equipment; pipe hoisting, installation, and welding; inspection; towing; repeated hoisting, welding, and towing work; completion of work and removal of equipment.

[0035] In this embodiment, the internal steel pipe jacking construction includes, in sequence: jacking equipment installation; pipe hoisting, installation, and welding; inspection; jacking; repeated hoisting, welding, and dragging work; completion of work and removal of equipment.

[0036] In this embodiment, the construction preparation specifically includes: preparation of the ground platform for the working shaft and receiving shaft, and preparation of the platform inside the shaft. Specifically, the preparation of the ground platform for the working shaft and receiving shaft includes: water and electricity installation, site leveling, arrangement of mud pits, protection of enclosures, and disposal of excavated soil, etc. The preparation of the platform inside the shaft includes: erection of the working platform, arrangement and installation of jacking equipment, erection of upper and lower passages, and protective measures for entering and exiting the tunnel, etc.

[0037] The construction requirements include: control of raw materials, inspection of jacking / pulling equipment, and process control. Specifically, raw material control involves timely inspection and testing of all raw materials (pipes) upon arrival on site; jacking work can only commence after the materials have passed inspection. Inspection of the jacking / pulling equipment involves a comprehensive inspection of the entire equipment after installation, ensuring all data meet requirements, and that the laid pipes comply with construction and environmental protection requirements. Process control specifically includes ensuring that jacking pressure and speed, and the gaps in the concrete sleeve connections, meet relevant requirements.

[0038] In this embodiment, the construction process of the internal steel pipe is as follows: After the first (left) reinforced concrete sleeve jacking construction is completed, the jacking machine is hoisted to the second (right) for jacking construction, while the first pipeline is prepared for internal steel pipe installation and subsequent construction. The specific process is as follows: construction preparation → installation of steel pulley bracket and winch → steel pipe acceptance → steel pipe hoisting into the welding trench → steel pipe welding → steel pipe weld inspection → steel pipe outer seam anti-corrosion → inspection and acceptance → winch pulling the steel pipe → repeating the above pulling steps → after the pipeline pulling length exceeds the limit distance, jacking construction is switched to → jacking equipment relocation and winch relocation → steel pipe hoisting into the welding trench → steel pipe welding → steel pipe weld inspection → steel pipe outer seam anti-corrosion → inspection and acceptance → jacking equipment jacking the steel pipe → repeating the above jacking steps → steel pipe jacking completed and accepted → concrete sleeve end sealing → reinforced concrete sleeve inner circumferential M10 cement mortar pouring → water pressure test → steel pipe internal anti-corrosion construction.

[0039] In this embodiment, the equipment for pulling and jacking the internal steel pipe includes (taking an internal steel pipe with an inner diameter of ∅1200 (casing ∅1600) as an example): steel pipe pulling lugs and steel pulley brackets. The steel pipe pulling lugs are located within a 30° range inside the bottom of the first section of the steel pipe, welded from 2.0cm thick steel plates, with one lug on each of the left and right sides. The steel pulley brackets are made of 50*50mm square steel (pipes) longitudinally fixed to the reinforced concrete casing using expansion bolts, with a track width of 30cm. Two longitudinal square steel bars are connected every 80cm with a ∅22 steel bar, which passes through two bearings (pulleys) and is welded and fixed (e.g., ...). Figure 4 (As shown).

[0040] In this embodiment, the hoisting of the steel pipe is specifically as follows: After the steel pipe is transported to the construction site, it is inspected according to procedures; after passing the inspection, a 25t truck crane is used to unload the pipe; during the steel pipe construction, a steel pipe welding platform is prepared. The welding platform is located inside the working well, with a platform length of 10m, and is welded from 22# channel steel and 8mm steel plates. The platform has reserved trenches (working pits) for welding and anti-corrosion construction; the platform elevation must be strictly controlled to ensure that the elevation of the steel pipe axis meets the design requirements; the 25t truck crane is used to transport the hoisted steel pipe to the pipeline design location or the already installed pipeline location, ready for installation and connection; when the pipe fittings are moved, to prevent collision at the connection point... The moving pipe fittings should be operated slowly and smoothly; the welding and inspection of the steel pipes are as follows: the steel pipes are welded using carbon dioxide gas shielded welding, and the bottom weld is carried out in the welding pit reserved on the steel pipe installation platform; according to the design and specification requirements, the internal quality inspection of the weld is carried out using a combination of ultrasonic non-destructive testing and X-ray testing; the external corrosion protection of the steel pipes is as follows: the external corrosion protection of the steel pipes is carried out after the welding of a section of steel pipe is completed, and the corrosion protection material is a solvent-free heavy-duty anti-corrosion coating, which is composed of a two-component solvent-free special quick-drying coating based on epoxy resin or modified epoxy resin, and a modified amine curing agent; the thickness of the anti-corrosion layer of the jacking pipe is not less than 900μm.

[0041] In this embodiment, the dragging / jacking of the steel pipe is specifically as follows: After the welding of the first and second steel pipe sections is completed and they pass inspection and acceptance in other processes, a winch is used to pull these two steel pipe sections, moving the second steel pipe section to the position of the first section (starting position). Then, the third steel pipe section is installed and welded. After the third steel pipe section is welded and inspected and passed, these three steel pipe sections are pulled, moving the third steel pipe section to the position of the first section (starting position), and so on. Because the distance between the winch (receiving well) and the steel pipe welding (working well) is relatively large, in order to ensure construction safety during the dragging of the steel pipe, the two working faces communicate with each other using walkie-talkies (e.g., Figure 5 As shown); when the length of the towed pipe exceeds a certain length, to ensure safety, the towing method is changed to a jacking method (e.g. Figure 6 (As shown).

[0042] In this embodiment, the end sealing of the jacking pipe is specifically as follows: the end is sealed with 12mm red bricks. After the steel pipe is jacked into place, the gap between the steel pipe and the reinforced concrete jacking pipe is sealed with a plug. The very end of the plug is finished with M10 cement mortar. The circumferential cement mortar pouring inside the reinforced concrete jacking pipe is specifically as follows: the circumferential cement mortar inside the reinforced concrete jacking pipe has a strength of M10 and is self-mixed. After the mortar is thoroughly mixed, a BW-200 pressure-reducing pump is used to grout the reserved holes on the pipe sections one by one through the main pipe, branch pipes, and ball valves. The grouting hole pressure is 50-80Kpa, and the grouting flow rate is controlled at 7-10L / min. During the grouting process, the grout is continuously and slowly stirred for a time shorter than the initial setting time of the grout. The grout is filtered through a screen before pumping. The internal corrosion protection of the steel pipe is specifically as follows: after the welding quality of the steel pipe passes the pressure test, rust removal and internal anti-corrosion mortar lining are carried out.

[0043] Furthermore, the key points of quality control in this invention are as follows:

[0044] 1. After the reinforced concrete pipes and the internal steel pipes are transported to the construction site, they shall be inspected in accordance with the procedures.

[0045] 2. When loading, unloading, and hoisting pipelines into the working shaft, always adhere to the principle of handling with care. Use a double-point sling hoist for steel pipe hoisting. Wrap the slings with rubber or burlap to prevent hard parts of the slings from damaging the pipe fittings and protective layer. Take measures to prevent impurities from entering the pipes or fittings during pipe lowering; thoroughly clean the joints to remove foreign objects and dust from the pipes.

[0046] 3. Before welding the steel pipe, the rust, slag, oil stains, water stains and other impurities in the bevel and within 10-20mm on both sides should be carefully cleaned until the metal luster is exposed.

[0047] 4. When welding internal and external supports, clamps and other temporary components of steel pipes, it is strictly forbidden to strike or extinguish the arc on the base material.

[0048] 5. When the local gap in the weld assembly exceeds 5mm, but the length does not exceed 15% of the weld length, surfacing welding is permitted on both sides or one side of the bevel. However, it is strictly forbidden to fill the gap with metal material. After surfacing welding, the weld should be dressed to the specified dimensions with a grinding wheel while maintaining the original bevel shape, and non-destructive testing should be performed on the surfacing area.

[0049] 6. After welding is completed, the welder should conduct a self-inspection. The top of the butt weld should be uniform and flat, with a height not exceeding 3mm. If visual inspection reveals that the weld surface contour is unsuitable for non-destructive testing and anti-corrosion coating application, it should be ground flat. After passing the self-inspection, a mark should be made with paint near the weld and a record should be made for future reference.

[0050] 7. In accordance with design and specification requirements, the internal quality inspection of welds shall be carried out using a combination of ultrasonic non-destructive testing and X-ray testing.

[0051] 8. External corrosion protection of steel pipes shall be carried out after the welding of a section of steel pipe has been completed and passed inspection. The corrosion protection material shall be a solvent-free heavy-duty anti-corrosion coating, which consists of a two-component solvent-free quick-drying coating based on epoxy resin or modified epoxy resin, and a modified amine curing agent. The thickness of the anti-corrosion layer shall not be less than 900μm.

[0052] The safety measures are as follows:

[0053] 1. Before the casing installation, place signs on the road and assign personnel to monitor the area to warn passing motor vehicles. Simultaneously, assign a site safety officer to manage the site, report any issues promptly, and take appropriate measures.

[0054] 2. During underground construction, ensure unified command and coordination between the surface and underground operations, and inspect the hoisting ropes to prevent injuries.

[0055] 3. During construction, jacking should be carried out continuously and adjustments should be made as needed. The condition of each part should be observed and monitored. If any abnormal sound is heard, construction should be stopped immediately, the problem should be checked, and repairs and adjustments should be made in a timely manner.

[0056] 4. Corrosion protection work inside pipelines requires operation within the pipeline, which constitutes confined space construction. Before entering the confined space, construction personnel must undergo a safety inspection, record the inspection data, and confirm that the work meets the requirements before entering.

[0057] 5. During construction, if heavy rain, heavy snow, heavy fog, or winds of level six or above affect construction safety, lifting work should be stopped and the boom lowered to a safe position.

[0058] 6. During the hoisting process, the on-site safety officer must be responsible for on-site safety management.

[0059] 7. During the lifting and lowering process, personnel are prohibited from staying or passing under the hoisted object to prevent the object from falling and causing an accident.

[0060] 8. In case of emergency while the crane is in operation, the emergency stop switch should be pulled immediately. If the winch brake suddenly fails during the lowering of a heavy object, emergency measures should be taken (i.e., the heavy object is slightly raised and then lowered, then slightly raised again and lowered again, and so on repeatedly until the heavy object is safely lowered).

[0061] 9. The secureness of wire rope joints and the connection between the wire rope and the sheath must be checked frequently. The side of the sheath with the nut and pressure plate should be at the end closest to the length of the wire rope to prevent loosening or detachment. Determine the specifications, quantity, and spacing of the sheaths, and arrange them according to the standard based on the diameter of the wire rope. Do not touch the wire rope and pulleys by hand while the machine is running to prevent accidents. Wire ropes passing through pulleys must not have joints to prevent them from getting stuck.

[0062] 10. The distribution boxes at the construction site shall be regularly cleaned and inspected during power outages. All distribution boxes and switch boxes shall be inspected and maintained three times a month. Inspection and maintenance personnel must be professional electricians, wearing appropriate protective equipment and using insulated electrical tools. All electrical equipment shall be managed under a responsibility system, ensuring that whoever manages it is responsible for it.

[0063] 11. During inspection and maintenance, the corresponding power switch at the upstream level must be disconnected, and a "Do Not Close Switch, People Working" power outage sign should be displayed. Power outages and restorations must be handled by designated personnel.

[0064] 12. Plugs and sockets are strictly prohibited from being used for movable connections at the power input terminals of distribution boxes and switch boxes.

[0065] The environmental protection measures are as follows:

[0066] 1. The Safety Management Department is responsible for the environmental protection inspection and supervision of this project, and the construction team is responsible for its specific implementation.

[0067] 2. Before construction, the Engineering and Technology Department will brief the construction team on the environmental protection work for the project and keep relevant records. A penalty system will be established, and any violations discovered during inspections will be handled according to the requirements.

[0068] 3. During construction, the following aspects should be prioritized:

[0069] a. During construction, water trucks will be used to spray water on the construction access roads and soil stockpiling areas, and the soil stockpiling areas will be covered with dust-proof nets to prevent dust.

[0070] b. All kinds of garbage generated inside the pipeline during construction should be cleaned up and transported outside the pipeline for storage and disposal as required.

[0071] c. Waste oil generated during equipment maintenance during construction must be collected and stored in a centralized manner, and a recycling agreement must be signed with a qualified unit.

[0072] d. Low-noise equipment should be prioritized in the production site, and noise reduction measures should be taken to reduce noise during the production process.

[0073] e. During construction, ventilation equipment is installed inside the steel pipe to improve the welding environment inside the pipe.

[0074] f. Construction workers are prohibited from spitting or urinating / defecating in the pipeline.

[0075] 4. A dedicated mud pit and drainage ditch shall be set up at the construction site. Waste mud shall be transported off the site in a timely manner. Rainwater and sewage shall be treated and discharged to designated locations. Discharge shall comply with the standards and regulations and shall not pollute nearby water sources and rivers.

[0076] 5. Water spraying measures will be taken at the construction site to avoid dust during operations.

[0077] 6. Waste oil from machinery should be collected promptly and disposed of in a unified manner, and should not be used to pollute the ground or water sources.

[0078] Example 1

[0079] like Figure 7 As shown, due to the space constraints of the working shaft and receiving shaft during pipe jacking construction, and the safety restrictions imposed by the construction crossing the highway, only single-pipe, unidirectional jacking is possible.

[0080] This construction method involves deploying one pipe jacking machine in the working shaft, one crane outside the shaft, and a towing device in the receiving shaft for construction. The construction sequence is as follows: ① Jacking the left-side reinforced concrete pipe → ② Moving the pipe jacking machine to jack the right-side reinforced concrete pipe, while simultaneously towing the first half of the left-side inner steel pipe (tentative towing length is 84m) → ③ Moving the jacking device to jack the second half of the left-side inner steel pipe (remaining section), while simultaneously towing the first half of the right-side inner steel pipe (tentative towing length is limited to 84m) → ④ Moving the jacking device to jack the second half of the right-side inner steel pipe (remaining section).

[0081] The traditional construction method involves placing a pipe jacking machine in the working shaft and a crane outside the shaft for construction. The construction sequence is as follows: ① Jacking in the left reinforced concrete pipe → ② Moving the pipe jacking machine and jacking in the right reinforced concrete pipe, while simultaneously preparing for the left inner pipe insertion → ③ Moving the pipe jacking machine and jacking in the entire length of the left inner steel pipe, while simultaneously preparing for the right inner steel pipe insertion → ④ Moving the pipe jacking machine and jacking in the entire length of the right inner steel pipe.

[0082] This construction method features high equipment utilization, short construction intervals, and tight workflow. In contrast, traditional methods leave workers waiting after completing the preparatory work for inserting the steel pipe, resulting in significant delays. This step, however, is non-critical in this method and does not impact the overall construction schedule. Furthermore, the method employs overlapping construction, demanding a more scientific, rational, and efficient level of on-site construction management and capabilities.

[0083] This construction method limits the length of the inner steel pipe to be pulled in the first half of the project to 84m. This limit was determined after a comprehensive analysis of parameters such as the weight of the steel pipe, the length and slope along the route, the capacity of the pulling equipment, and the size of the working and receiving wells, all while ensuring safety. The maximum length of the inner pipe to be pulled varies depending on the specific working conditions. Furthermore, because the pulling equipment is fixed at the outlet end of the receiving well, the last section of the inner steel pipe requires jacking construction using a jacking device.

[0084] This invention employs a combined dragging and jacking construction method for the embedded steel pipe when crossing highways. It fully utilizes a single working platform, combining dragging and jacking processes. By optimizing the construction steps, only a single jacking device is needed, allowing simultaneous construction at two work points. This shortens construction intervals, improves efficiency, and helps reduce costs. The overall construction noise is low, and the amount of surface excavation is minimal, causing no impact on the environment or traffic. It is suitable for underground pipeline construction crossing obstacles such as highways, railways, rivers, and surface buildings. While ensuring construction safety and improving construction quality, it also minimizes environmental impact, contributing to environmental protection. This method significantly improves the efficiency of steel pipe crossings, effectively ensuring that steel pipe installation is completed on schedule as stipulated by the client, resulting in significant social benefits.

[0085] Example 2

[0086] This invention is applied to the Nanjing Jiangbei Yangtze River Delta Integrated Green Development Second Water Source and Supporting Facilities Construction Project (Section 8).

[0087] This project section (Section 8) starts at the Qiaolin Water Plant (B0+0-B3+000), and runs along the Jiangbei Riverside Highway to the end point (B2+195), entering the wooded area on the left, with a total length of approximately 3km. Double pipelines (DN2000 raw water pipeline) will be laid using open-cut excavation, with a total length of approximately 3000m, using double rows of DN2000 steel pipes. Pipeline specifications: steel pipe, material Q235B killed steel, DN2000*18. The pipeline route crosses the existing Ninghe Expressway for a total length of 210 meters. To ensure construction quality and safety, and improve construction efficiency, a double-track pipe jacking method combined with steel pipe dragging and jacking will be used for the section crossing the Ninghe Expressway. This method significantly improves pipeline installation efficiency, reduces construction costs, and simplifies and speeds up the installation process.

[0088] Example 3

[0089] This invention is applied to the EPC general contracting of rainwater and sewage separation projects in Dachang and Pancheng town areas.

[0090] This project mainly involves the separation of rainwater and sewage in residential areas, public institutions, shantytowns and factories in Dachang and Pancheng Street areas, the renovation of waterlogging points, the ecological management of rivers in the area and the construction of pumping stations, including: ① a total of 176.509 km of newly built rainwater and sewage pipelines, with a total pipe jacking length of 2362 m. Pipes with diameters D2000mm and above: 162m; pipes with diameters D1500mm and above: 560.3m; pipes with diameters D1200mm and below: 164.3m; pipes with diameters D1000mm and above: 7931m; pipes with diameters D800mm and above: 2684m; pipes with diameters D600mm and below: 19005m; pipes with diameters D500mm and above: 2138.2m; pipes with diameters D400mm and above: 13924m; pipes with diameters D300mm and above: 97649.01m; pipes with diameters D200mm and above: 12264.05m; pipes with diameters D100mm and above: 20028m. ② Getang River: Extending from the Nanjing Chemical Research Institute in the east to the Mahan River in the west, the total length of the river channel is approximately 2.38km. The project mainly includes: interception of sewage along the river, dredging, water diversion and replenishment, ecological restoration, and construction of water purification stations. Jiangqiao River: Extending from Weiwu Road in the west to the Yangtze River in the east, the river is approximately 1.62 km long. The project mainly includes: sewage interception, dredging, and ecological purification along the riverbanks, with an ecological purification point source treatment capacity of 5500 m² / d. Qunying River: Extending from Guixinyuan in the east to Tuanjie River in the west, the river is approximately 3.7 km long. The project mainly includes: sewage interception, dredging, water diversion and replenishment, and ecological purification along the riverbanks, including two regulating reservoirs on the south and north tributaries, and one ecological purification point source with a treatment capacity of 300 m² / d. No. 3 Ditch: Extending from the culvert on Fenghuang South Road in the west to the Yangtze River in the east; No. 4 Ditch: Extending from the west side of Dawei Road in the west to the Yangtze River in the east; No. 5 Ditch: Extending from Dawei Road in the west to the Yangtze River in the east; No. 6 Ditch: Extending from Dawei Road in the west to the Yangtze River in the east. The project mainly includes: sewage interception, dredging, and point source treatment equipment along the riverbanks. The total dredging length of Ditch No. 4 is 651m, Ditch No. 5 is 2093m, and Ditch No. 6 is 768m. The point source treatment capacity is 10,000 m² / d for Ditch No. 3 and 10,000 m² / d for Ditches No. 4, 5, and 6. ④ The Getang Pumping Station is designed with a flow rate of 12 cubic meters per second, covering a total area of ​​6390 m², with a green area of ​​2876.5 m². ⑤ The Getang River Regulation and Purification Station covers an area of ​​5923 m² and is a fully underground structure.

[0091] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A construction method combining double-track pipe jacking with internal steel pipe dragging and jacking for crossing wide highways, characterized in that... In order, they include: The construction method involves reinforced concrete pipe jacking, internal steel pipe dragging, and internal steel pipe jacking. One pipe jacking machine is deployed in the working shaft, a crane is deployed outside the shaft, and a dragging device is deployed in the receiving shaft. The construction sequence is as follows: jacking the left reinforced concrete casing → moving the pipe jacking machine, jacking the right reinforced concrete casing while simultaneously dragging the first half of the left internal steel pipe → moving the dragging device, jacking the second half of the left internal steel pipe while simultaneously dragging the first half of the right internal steel pipe → moving the dragging device. Position, jacking in the second half of the right-side internal steel pipe; the construction process of the internal steel pipe is as follows: after the first reinforced concrete sleeve jacking is completed, the jacking machine is hoisted to the second stage for jacking, while the first pipeline is prepared for internal steel pipe installation and subsequent construction; the specific process is: construction preparation → installation of steel pulley bracket and winch → steel pipe acceptance → hoisting the steel pipe into the welding trench and positioning → steel pipe welding → steel pipe weld inspection → steel pipe external seam anti-corrosion → inspection and acceptance → winch dragging the steel pipe → repeating the above dragging steps → pipeline dragging length exceeds After exceeding the specified distance, the construction method is changed to jacking construction → jacking equipment relocation and winch repositioning → steel pipe hoisting into the welding trench and positioning → steel pipe welding → steel pipe weld inspection → steel pipe external seam anti-corrosion → inspection and acceptance → jacking equipment jacks up the steel pipe → repeat the above jacking steps → steel pipe jacking completed and accepted → concrete sleeve end sealing → reinforced concrete sleeve inner circumferential M10 cement mortar pouring → water pressure test → steel pipe internal anti-corrosion construction; the specific process of steel pipe dragging / jacking is as follows: the welding of the first and second steel pipe sections is completed and inspected and accepted in other processes. After the first section is positioned, a winch is used to pull the two steel pipe sections, moving the second section to the position of the first. Then, the third section is installed and welded. After the third section is welded and inspected, the three sections are pulled to move it to the position of the first, and so on. Because the distance between the winch and the welded steel pipe is relatively large, walkie-talkies are used to communicate between the two work faces to ensure construction safety during the pipe pulling. When the length of the pipe being pulled exceeds a certain length, the pulling method is changed to jacking to ensure safety.

2. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways as described in claim 1, is characterized in that, The reinforced concrete pipe jacking construction includes the following steps in sequence: construction preparation; surveying and setting out; setting out verification; installation of equipment in the working shaft; preparation for entering the tunnel; mud removal; advancing; surveying and directional correction; pipe hoisting and installation; pipe jacking; preparation for exiting the tunnel; removal of the tunneling machine and auxiliary equipment; completion of this section of pipe jacking construction. Before advancing, the following steps are also included in sequence: installation of ground equipment, preparation of grouting materials, and grouting.

3. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways as described in claim 2, is characterized in that... The internal steel pipe dragging construction includes the following steps: Track and towing equipment installation; pipe hoisting, installation, and welding; inspection; towing; repeated hoisting, welding, and towing work; completion of work and removal of equipment.

4. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways as described in claim 3, is characterized in that, The internal steel pipe jacking construction includes the following steps: Installation of jacking equipment; pipe hoisting, installation, and welding; inspection; jacking; repeated hoisting, welding, and jacking work; completion of work and removal of equipment.

5. The construction method for double-track pipe jacking with internal steel pipe dragging and jacking across a wide highway as described in claim 2, wherein the construction preparation specifically includes: Preparation work for the surface platform of the working shaft and receiving shaft, as well as preparation work for the platform inside the shaft. Specifically, the preparation work for the surface platform of the working shaft and receiving shaft includes: water and electricity installation, site leveling, mud pit layout, enclosure protection, and disposal of excavated soil. The preparation work for the platform inside the shaft includes: erection of the working platform, layout and installation of the jacking equipment, erection of access passages, and protective measures for entering and exiting the tunnel.

6. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways according to claim 4, is characterized in that, The internal steel pipe dragging and jacking equipment includes: steel pipe dragging lugs and steel pulley brackets. The steel pipe dragging lugs are arranged within a 30° range inside the bottom of the first section of steel pipe, and are made of welded steel plates, with one lug on each of the left and right sides. The steel pulley brackets are made of square steel and are longitudinally fixed to the reinforced concrete sleeve by expansion bolts. The two longitudinal square steel bars are connected by a steel bar at intervals and are welded and fixed through two bearings.

7. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways as described in claim 1, is characterized in that, The specific procedures for hoisting steel pipes are as follows: After the steel pipes are transported to the construction site, they are inspected according to procedures; after passing the inspection, the pipes are unloaded; during steel pipe construction, a steel pipe welding platform is prepared, located inside the working well, with reserved trenches for welding and anti-corrosion construction; the hoisted steel pipes are transported to the pipeline design location or the already installed pipeline location, ready for installation and connection; the specific procedures for welding and inspecting steel pipes are as follows: steel pipe welding uses carbon dioxide gas shielded welding, and the bottom weld is carried out in the welding working pit reserved on the steel pipe installation platform; the internal quality inspection of the weld is carried out using a combination of ultrasonic non-destructive testing and X-ray testing; the specific procedures for external anti-corrosion of steel pipes are as follows: external anti-corrosion of steel pipes is carried out after the welding of a section of steel pipe is completed, and the anti-corrosion material is a solvent-free heavy-duty anti-corrosion coating, which is composed of a two-component solvent-free special quick-drying coating based on epoxy resin or modified epoxy resin, and a modified amine curing agent; the thickness of the anti-corrosion layer of the steel pipe is not less than 900μm.

8. The construction method of double-track pipe jacking with internal steel pipe dragging and jacking combined with the construction method for crossing wide highways according to claim 1, characterized in that, The end sealing of the jacking pipe is as follows: the end is sealed with red bricks. After the steel pipe is jacked into place, the gap between the steel pipe and the reinforced concrete jacking pipe is sealed with a plug. The end of the plug is finished with cement mortar. The circumferential cement mortar pouring inside the reinforced concrete jacking pipe is as follows: after the mortar is fully mixed, it is grouted through the main pipe, branch pipe and ball valve through a pressure reducing pump to grout the reserved holes on the pipe section one by one. During the grouting process, it is stirred slowly and continuously for a time less than the initial setting time of the grout. The grout is filtered through a screen before being pumped. The internal corrosion protection of the steel pipe is as follows: after the welding quality of the steel pipe passes the pressure test, rust removal and internal anti-corrosion mortar lining are carried out.

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