Construction method for assisting underground multi-angle butt joint of pipe jacking riding well in central urban area

Abstract

The invention discloses a construction method for assisting underground multi-angle butt joint of a jacking pipe riding well in a central urban area, and aims to solve the ubiquitous problems in the existing underground butt joint technology that underground excavation depends on a reinforcing body, the quality is high, the risk of fire welding operation is high, and a channel in a pipe is narrow, so that people, materials and machines are difficult to transport. The construction method is safer, more efficient and higher in applicability. By means of the optimized shaft downward excavation and prefabricated connecting component welding process, the underground excavation risk is reduced, and meanwhile various complex geological conditions are flexibly coped with; bIM technology simulation is adopted, the construction precision and efficiency are improved, and the construction period is effectively shortened; and the ventilation pipeline and the crawling ladder are arranged in the shaft, so that the operation environment is improved, the fire operation risk in a closed space is reduced, the construction safety is ensured, meanwhile, the problem that manpower, materials and machines are inconvenient to transport is solved, and the safety and the construction efficiency of pipe jacking underground butt joint construction are greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of drainage pipe laying, and in particular relates to a construction method for central urban area jacking pipe riding well assisted underground multi-angle docking. Background Art

[0002] With the development of cities, infrastructure related to people's livelihood, such as water supply and drainage pipelines, can no longer meet the needs, and most of them have been in disrepair for a long time, and there are phenomena such as leakage and aging. The transformation of old underground pipelines and the construction of new underground pipelines have become urgent problems to be solved in urban development. As a good non-excavation process, pipe jacking is becoming more and more common in the implementation of various urban underground pipelines. However, dense buildings and busy road traffic can no longer adapt to the construction conditions of traditional pipe jacking, which uses the method of laying pipelines by working wells out of the hole and receiving wells into the hole. Therefore, the underground docking construction technology of pipe jacking is increasingly being used in the construction of central urban areas.

[0003] For underground docking, for example: CN103807504B, which discloses a construction method for underground T-shaped docking of reinforced concrete pipes. After the top pipe is in place, the soil in the docking area is reinforced, and finally the docking area is penetrated by dark excavation. Its disadvantages: ① Dark excavation depends on the quality of the reinforcement body, and the risk of removing the chest plate is high; ② Confined space, hot welding operation is risky; ③ The passage inside the pipe is narrow, and it is difficult to transport people, materials and machines. Another example: Achievements. Key technologies for underground docking of steel top pipes under complex environments of a certain project [J]. China Municipal Engineering, 2019: 110-112. In order to facilitate the straight-line docking with the implemented tool pipe, a ring-shaped connecting steel cap brim is set at the front end of the tool pipe. After the top pipe is pushed to the existing tool pipe position, it will be connected with the existing tool pipe to achieve the preliminary work of pipeline docking. Its disadvantages: ① Although the dark excavation surface is reduced, the modified tunneling machine can only dock in a straight line; ② Confined space, hot welding operation is risky; ③ The passage inside the pipe is narrow, and it is difficult to transport people, materials and machines. Another example: Xu Fei, Wang Jianfeng. Construction technology for large-diameter long-distance curved top pipe docking [J]. Urban Roads, Bridges and Flood Control, 2006: 40-43. Adding a welded cap-shaped annular steel plate to the front shell of the tunnel boring machine is conducive to the safety and positioning of the docking construction. Its disadvantages: ① Although the dark excavation surface is reduced, the modified tunnel boring machine can only adapt to the silty soil layer; ② The confined space has a high risk of hot welding operations; ③ The passage inside the pipe is narrow, and the transportation of people, materials and machines is difficult.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a construction method for assisted underground multi-angle docking of jacking pipe riding wells in the central urban area, thereby solving the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A construction method for assisting underground multi-angle docking of a central urban area jacking pipe riding well, comprising the following steps:

[0008] Step (1): using mixing piles to reinforce the soil so that the soil in the area is water-stopping and self-supporting;

[0009] Step (2): Check the reinforcement quality of the soil in the docking area by coring on the ground. If the inspection result does not meet the requirements, return to the site for re-reinforcement.

[0010] Step (3): The two pipe jacking machines are pushed into the construction site through the hydraulic propulsion system respectively. When reaching the docking point, the axis deviation of the two pipe jacking machines is within ±5 cm;

[0011] Step (4): When the two pipe jacking machines reach the docking point, double liquid slurry is injected outward through the grouting holes reserved in the machine head and the grouting holes of the first section of the pipeline to close the building gap between the casing of the pipe jacking machine and the soil layer;

[0012] Step (5): a probe hole is opened at the chest plate of the machine head, and a partition is used to check whether there is leakage in front of the two machine heads. If leakage is found, the slurry operation of step (4) is performed again to perform water stopping treatment;

[0013] Step (6): After the docking is completed, a riding shaft is installed above the docking point as a ventilation and material transportation channel;

[0014] Step (7): gradually dig down from the wellbore and connect the wellbore with the machine head housing. Simulate by using BIM technology while gradually digging down from the wellbore and prefabricate the connecting components in advance.

[0015] Step (8): while gradually digging down in the wellbore, the cutter head of the machine head is cut off and the two butted machine head shells are connected. Simultaneously, simulation is performed through BIM technology to prefabricate the connection components in advance.

[0016] Step (9): After the machine head shell is connected, use cutting equipment to cut off the two machine head equipment and the chest plate steel structure to ensure structural integrity and convenient construction;

[0017] Step (10): The two machine heads are connected and docking is completed.

[0018] Optionally, during the quality inspection, the leakage coefficient of the soil reinforcement quality in the docking area shall not be greater than 1×10-7m / s, and the compressive strength shall not be less than 1MPa.

[0019] Optionally, the two pipe jacking machines are respectively the first head and the second head.

[0020] Optionally, when sinking the riding shaft, the shaft is lowered in three sections, the steel tubes are connected by welding, and the excavation and sinking are carried out manually with a vertical arm excavator. After the installation is completed, ventilation ducts and ladders are installed in the shaft at the same time.

[0021] Optionally, when sinking the riding well shaft, dig 25cm downward from the inside of the shaft toward the machine head shell, then prefabricate four steel plates, and then transport the four prefabricated steel plates into the shaft one by one, and then align the steel plates with the connecting parts of the shaft and the machine head shell, and use arc welding or gas shielded welding technology to weld the four steel plates to the connecting parts of the shaft and the machine head shell in turn. After the first welding is completed, dig down 25cm again, repeat the above steps for the second round of steel plate welding, and finally, weld the subsequent four steel plates in turn to form a complete connection structure.

[0022] Optionally, the construction steps of gradually digging down from the wellbore, cutting off the cutter disc, and connecting the two shells are as follows: First, after ensuring that there is no leakage at the connection position between the wellbore and the head shell, start digging gradually from the inside of the wellbore, and control the digging depth to 25 cm each time. At the same time, clean up the excavated earth. After digging to the target depth, use cutting equipment to perform partial cutting of the first head shell and its cutter disc. Then, perform welding operations on the first head and the second head shell, and use arc welding or gas shielded welding technology to achieve a tight connection between the two shells. At the same time, install and weld arc steel plates from top to bottom to form a transverse closed sealing structure. Finally, after completing the current layer of welding, continue the next round of digging, cutting and connecting operations, and repeat the above steps until the two shells are completely connected.

[0023] Optionally, use BIM technology to model the construction area in detail. The model should include key parameters such as soil structure, equipment size, and docking angle, to provide a basis for subsequent simulation and component prefabrication. Simulate the entire construction process in the BIM model, from excavation to cutterhead cutting, shell welding, and steel plate closure, and analyze the space requirements and possible construction risks of each step. Then, based on the BIM simulation results, design connecting components that meet the construction requirements, put the prefabricated components into the BIM model for virtual installation, and verify whether they match the connection with the head shell and shaft.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the advantages described below at the same time:

[0025] The present invention aims to solve the common problems in existing underground docking technology, such as high-quality reinforcement bodies relied on for dark excavation, high risks of hot-fire welding operations, and difficulties in transporting people, materials, and machines due to narrow passages in the pipe. The present invention proposes a safer, more efficient, and more applicable construction method. Through optimized shaft excavation and welding processes for prefabricated connecting components, the present invention can flexibly cope with a variety of complex geological conditions while reducing the risks of dark excavation; it uses BIM technology simulation to improve construction accuracy and efficiency, and effectively shortens the construction period; and it arranges ventilation ducts and ladders in the shaft to improve the working environment, reduce the risks of hot-fire operations in confined spaces, ensure construction safety, and solve the problem of inconvenient transportation of people, materials, and machines, greatly improving the safety and efficiency of underground docking construction of top pipes.

[0026] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a schematic diagram of the process of the underground multi-angle docking construction method assisted by the jacking pipe riding well in the central urban area of ​​this embodiment;

[0029] Figure 2 This is a schematic diagram of two pipe jacking machines arriving at the docking point in this embodiment;

[0030] Figure 3 This is a schematic diagram of the sinking of the wellbore of the riding well above the docking point in this embodiment;

[0031] Figure 4 A schematic diagram of gradually digging down from the wellbore to connect the wellbore and the head casing;

[0032] Figure 5 A schematic diagram showing the step-by-step digging from the wellbore, cutting off the cutterhead, and connecting the two shells;

[0033] Figure 6 This is a schematic diagram of the two machine heads being connected and docked in this embodiment.

[0034] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] See also Figure 1-6As shown, in this embodiment, a construction method for assisting underground multi-angle docking of a pipe jacking well in a central urban area is provided, comprising the following steps:

[0037] Step (1): Use mixing piles to reinforce the soil so that the soil in the area is water-stopping and self-supporting; soil reinforcement enhances the stability and sealing of the area, provides a safe construction environment, effectively prevents groundwater leakage and soil collapse during construction, and ensures the smooth progress of the jacking process.

[0038] Step (2): Check the reinforcement quality of the soil in the docking area by coring on the ground. If the inspection result does not meet the requirements, return for re-reinforcement. The coring inspection can accurately evaluate the soil reinforcement effect and ensure that the reinforced area meets the design requirements. If problems are found, re-reinforcement can be carried out in time to ensure the construction quality and reduce safety hazards in subsequent construction.

[0039] Step (3): The two pipe jacking machines are pushed into the construction site through the hydraulic propulsion system. When reaching the docking point, the axis deviation of the two pipe jacking machines is kept within ±5cm. By controlling the position of the machine heads, the docking error is reduced and the docking success rate of the two pipe jacking machines is improved. This high-precision propulsion avoids the subsequent complex adjustment work caused by axis deviation.

[0040] Step (4): When the two pipe jacking machines reach the docking point, double-liquid slurry is injected outward through the grouting holes reserved in the machine head and the grouting holes of the first section of the pipe to close the building gap between the outer shell of the pipe jacking machine and the soil layer; through the double-liquid slurry injection, the gap between the outer shell of the pipe jacking machine and the soil layer is effectively closed to prevent external mud and groundwater from flowing into the docking area, thereby ensuring the stability and safety of the construction environment.

[0041] Step (5): A probe hole is opened at the chest plate of the machine head, and a partition is used to check whether there is leakage in front of the two machine heads. If leakage is found, the slurry operation in step (4) is performed again to perform water stopping treatment. The probe hole inspection can monitor the leakage in real time, and the leakage area can be quickly found and located. Through secondary grouting, the leakage can be repaired in time, and the sealing of the docking area can be further improved.

[0042] Step (6): After the docking is completed, a riding shaft is installed above the docking point as a ventilation and material transportation channel; the installation of the riding shaft provides a ventilation and material transportation channel for subsequent construction, improves the construction environment, and improves the transportation efficiency of personnel and materials.

[0043] Step (7): gradually dig down from the wellbore and connect the wellbore with the head shell. Simulate by using BIM technology while gradually digging down from the wellbore and prefabricate the connecting components in advance. By gradually digging down and connecting, the risk of large-scale excavation is avoided. At the same time, BIM technology optimizes component design and prefabrication, improves connection accuracy and construction efficiency, and shortens the construction period.

[0044] Step (8): While digging gradually in the shaft, the cutter head of the machine head is cut off and the two docked machine head shells are connected. Simultaneously, BIM technology is used for simulation to prefabricate the connection components in advance. By simultaneously cutting the cutter head and connecting the shells during the digging process, the waiting time between construction steps is reduced. BIM simulation further optimizes the operation process and ensures the sealing and strength of the shell connection.

[0045] Step (9): After completing the connection of the machine head shell, use cutting equipment to cut off the two machine head equipment and the chest plate steel structure in pieces to ensure structural integrity and convenient construction; cutting off the machine head equipment and the chest plate steel structure in pieces helps to clean up the construction area, providing sufficient space for subsequent construction, while ensuring a safe and efficient construction process.

[0046] Step (10): The two machine heads are connected and docked. The completion of docking marks the success of the pipe jacking construction and ensures the smooth implementation of the drainage pipe laying. The efficient and safe docking process reduces the impact of the construction on the surrounding environment and improves the overall project quality.

[0047] In this embodiment, during the quality inspection, the leakage coefficient of the soil reinforcement quality in the docking area is not greater than 1×10-7m / s, and the compressive strength is not less than 1MPa.

[0048] In this embodiment, the two pipe jacking machines are respectively a first machine head 1 and a second machine head 2.

[0049] In this embodiment, when sinking the riding shaft, a three-section sinking method is adopted. The steel tubes are connected by welding, and manual excavation and sinking are carried out with a vertical arm excavator. After the installation is completed, ventilation ducts and ladders are installed in the shaft at the same time. The shaft and the head shell are firmly connected together by welding prefabricated steel plates in steps, which enhances the integrity of the structure and effectively resists the underground soil pressure and external forces that may be generated during the construction process. The arc welding or gas shielded welding process ensures the tightness of the welding gap, and the sealing structure is formed by the step-by-step welding of steel plates to further prevent groundwater and sediment from entering the docking area and improve construction safety.

[0050] In this embodiment, when sinking the riding well shaft, dig 25cm from the inside of the shaft toward the machine head shell, then prefabricate four steel plates, and then transport the four prefabricated steel plates into the shaft one by one, and then align the steel plates with the connection part of the shaft and the machine head shell, and use arc welding or gas shielded welding technology to weld the four steel plates to the connection part of the shaft and the machine head shell in sequence, wherein, after the first welding is completed, dig down 25cm again, repeat the above steps to carry out the second round of steel plate welding, and finally, weld the subsequent four steel plates in sequence to form a complete connection structure. By welding the prefabricated steel plates in steps, the shaft and the machine head shell are firmly connected together to form a continuous connection structure, which improves the overall structural strength and ensures the stability of the connection. The operation is carried out in stages, and inspection and adjustment can be carried out after each digging and welding to ensure that each step meets the design requirements and avoid the uncontrollability of one-time construction.

[0051] In this embodiment, the construction steps of gradually digging down from the wellbore, cutting off the cutter disc, and connecting the two shells are as follows: first, after ensuring that there is no leakage at the connection position between the wellbore and the head shell, start digging down from the inside of the wellbore step by step, and control the digging depth at 25cm each time, and clean up the excavated earth at the same time. After digging to the target depth, use cutting equipment to partially cut the first head 1 shell and its cutter disc, and then perform welding operations on the first head 1 and the second head 2 shells, using arc welding or gas shielded welding technology to achieve a tight connection between the two shells. At the same time, install and weld arc steel plates from top to bottom to form a transverse closed sealing structure. Finally, after completing the welding of the current layer, continue the next round of digging, cutting and connecting operations, and repeat the above steps until the two shells are completely connected. The digging depth is strictly controlled at 25cm each time, which can gradually reduce the disturbance to the surrounding soil layer, effectively avoid the risk of collapse or structural instability caused by one-time large-scale digging, and ensure the safety of the construction area. The local cutting of the cutter disc of the first machine head 1 by the cutting equipment can accurately remove the interference area, provide sufficient space for the shell connection, and avoid damage to the surrounding uncut parts. The arc steel plates are installed and welded layer by layer to form a transverse closed sealing structure, which can effectively prevent groundwater and sediment leakage and improve the waterproof performance of the overall construction area.

[0052] In this embodiment, BIM technology is used to model the construction area in detail. The model should include key parameters such as soil layer structure, equipment size, and docking angle, to provide a basis for subsequent simulation and component prefabrication. The entire construction process is simulated in the BIM model, from digging to cutterhead cutting, shell welding to steel plate closing, and the space requirements and possible construction risks of each step are analyzed. Then, based on the BIM simulation results, connecting components that meet the construction requirements are designed, and the prefabricated components are placed in the BIM model for virtual installation to verify whether they match the connection with the head shell and the shaft.

[0053] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. A construction method for assisted underground multi-angle docking of pipe jacking and horse riding wells in the central urban area, characterized in that: The following steps are involved: Step (1): using mixing piles to reinforce the soil so that the soil in the area is water-stopping and self-supporting; Step (2): Check the reinforcement quality of the soil in the docking area by coring on the ground. If the inspection result does not meet the requirements, return to the site for re-reinforcement. Step (3): The two pipe jacking machines are pushed into the construction site through the hydraulic propulsion system respectively. When reaching the docking point, the axis deviation of the two pipe jacking machines is within ±5 cm; Step (4): When the two pipe jacking machines reach the docking point, double liquid slurry is injected outward through the grouting holes reserved in the machine head and the grouting holes of the first section of the pipeline to close the building gap between the casing of the pipe jacking machine and the soil layer; Step (5): a probe hole is opened at the chest plate of the machine head, and a partition is used to check whether there is leakage in front of the two machine heads. If leakage is found, the slurry operation of step (4) is performed again to perform water stopping treatment; Step (6): After the docking is completed, a riding shaft is installed above the docking point as a ventilation and material transportation channel; Step (7): gradually dig down from the wellbore and connect the wellbore with the machine head housing. Simulate by using BIM technology while gradually digging down from the wellbore and prefabricate the connecting components in advance. Step (8): while gradually digging down in the wellbore, the cutter head of the machine head is cut off and the two butted machine head shells are connected. Simultaneously, simulation is performed through BIM technology to prefabricate the connection components in advance. Step (9): After the machine head shell is connected, use cutting equipment to cut off the two machine head equipment and the chest plate steel structure to ensure structural integrity and convenient construction; Step (10): The two machine heads are connected and docking is completed.

2. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: During the quality inspection, the leakage coefficient of the soil reinforcement quality in the docking area shall not be greater than 1×10 -7 m / s, compressive strength is not less than 1MPa.

3. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: The two pipe jacking machines are respectively a first machine head 1 and a second machine head 2.

4. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: When sinking the riding shaft, the method of sinking in three sections is adopted. The steel cylinders are connected by welding, and the excavation and sinking are carried out manually with the help of a vertical arm excavator. After the installation is completed, ventilation ducts and ladders are installed in the shaft at the same time.

5. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: When sinking the riding well shaft, dig 25cm downward from the inside of the shaft toward the machine head shell. Then, the four prefabricated steel plates are transported into the shaft one by one. Then, the steel plates are aligned with the connection parts of the shaft and the machine head shell. Arc welding or gas shielded welding is used to weld the four steel plates to the connection parts of the shaft and the machine head shell in turn. After the first welding is completed, dig down 25cm again and repeat the above steps for the second round of steel plate welding. Finally, the subsequent four steel plates are welded in turn to form a complete connection structure.

6. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: The construction steps of gradually digging down from the wellbore, cutting off the cutterhead, and connecting the two shells are as follows: First, after ensuring that there is no leakage at the connection position between the wellbore and the head shell, start digging down from the inside of the wellbore step by step, and control the digging depth to 25cm each time. At the same time, clean up the excavated earth. After digging to the target depth, use cutting equipment to perform partial cutting of the first head 1 shell and its cutterhead. Then, perform welding operations on the first head 1 and the second head 2 shells, and use arc welding or gas shielded welding technology to achieve a tight connection between the two shells. At the same time, install and weld arc steel plates from top to bottom to form a transverse closed sealing structure. Finally, after completing the welding of the current layer, continue the next round of digging, cutting and connecting operations, and repeat the above steps until the two shells are completely connected.

7. The construction method of a central urban area jacking pipe riding well assisted underground multi-angle docking according to claim 1 is characterized in that: Use BIM technology to model the construction area in detail. The model should include key parameters such as soil structure, equipment size, and docking angle to provide a basis for subsequent simulation and component prefabrication. The entire construction process is simulated in the BIM model, from excavation to cutterhead cutting, shell welding, and steel plate closure. The space requirements and possible construction risks of each step are analyzed. Then, based on the BIM simulation results, connecting components that meet the construction requirements are designed, and the prefabricated components are placed in the BIM model for virtual installation to verify whether they match the connection with the head shell and the shaft.

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