Method for integrally building station and interval tunnel

Abstract

The invention discloses a method for integrally building a station and an interval tunnel, which is characterized by comprising station tunnel construction and interval tunnel construction, during construction, firstly, a station position is selected according to ground station setting conditions, and a necessary end well is completed; then, two shield tunneling machines or pipe jacking machines are vertically combined for tunneling construction to complete full-standard-section main body construction of the first station tunnel; then a shield tunneling machine or a pipe jacking machine is used for completing full-standard-section main body construction of the second station tunnel; constructing a connecting channel between the interval tunnel and the two station tunnels to form a combined structure with an L-shaped section, so as to realize mutual communication of the in-station tunnels; carrying out in-station construction, arranging an equipment area and constructing a ventilation pavilion; and building an entrance and exit which is communicated with the upper part of the first station tunnel to form a complete station and interval tunnel. The method is high in feasibility and small in risk, and a new thought is created for underground excavation construction of the subway station in the central urban area which is not suitable for adopting a large-range open excavation method under complex environmental conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of subway and tunnel construction, and particularly relates to a method for integrally constructing a station and an interval tunnel by a rectangular-section eccentric combined tunneling machine. Background Art

[0002] In the central urban area, there are often various dense buildings (structures) on the ground, and various pipelines are also often densely distributed underground. In the central area of the ancient city, the ground roads are not wide and the traffic is very busy. Coupled with factors such as the red line restrictions on both sides of the road, if the traditional open-cut method or cover-and-cut method is still used for the construction of subway stations and intervals, multiple challenges will be faced, including the difficulty or non-permissibility of demolition, strict implementation conditions, high construction risks, the difficulty of controlling the construction period, and high upfront demolition costs. Therefore, exploring a new construction method with less land occupation, less demolition, less environmental impact, controllable construction period, less risk, and better economy is of great significance for the construction of subway stations and intervals in the central urban area, especially in the central area of the ancient city.

[0003] In addition, due to the relatively limited cross-sectional size of commonly used rectangular shield machines or pipe jacking machines, it is difficult to meet the functional and architectural layout requirements of subway stations. However, there are still many technical problems and high costs in the equipment manufacturing and on-site implementation of super-large rectangular shield machines or pipe jacking machines. Therefore, studying how to construct subway stations and intervals through the combination of rectangular cross-sections of existing standard shield machines or pipe jacking machines will provide innovative ideas for the underground excavation construction of subway stations and intervals under complex environmental conditions in the central urban area. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated construction method for a subway station and a circular interval tunnel that is highly feasible and low-risk in engineering and can be realized through the spatial combination of rectangular-section shield machines or pipe jacking machines in the central area of the ancient city or other areas, aiming at the difficulty of implementing traditional large-scale excavation construction on the ground in the central urban area with complex environments that need to meet requirements such as traffic preservation, key cultural relic preservation, less disturbance to residents, and less demolition. The combined subway station and interval constructed by this method can effectively meet the station function and train operation function, and can achieve the goals of less demolition, less excavation, less pipeline relocation, less disturbance to residents, and good economy.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is: A method for integrally constructing a station and an interval tunnel, characterized in that it includes station tunnel construction, and the station tunnel construction includes the following steps: S1. Construct the end shaft: First, complete the necessary end shaft construction; S2. Main construction of the No. 1 and No. 2 station tunnels: After the end well is completed and the conditions for starting are met, the excavation equipment will be installed, and two rectangular shield machines or pipe jacking machines will be used to perform vertical combined excavation construction to complete the main construction of the No. 1 station tunnel. After the main construction of the No. 1 station tunnel is completed, a rectangular shield machine or pipe jacking machine will be used to push and complete the main construction of the No. 2 station tunnel; at the same time, ensure that the parts where the main parts of the No. 1 station tunnel and the No. 2 station tunnel need to be connected through the connecting channel and the parts where the main part of the No. 1 station tunnel needs to be connected to the entrance and exit channels are all installed with the hole pipe section with the side reserved opening, and the other parts are conventional main pipe sections.

[0006] S3. Construction of connection between No. 1 and No. 2 station tunnels: several connecting passages are constructed between No. 1 station tunnel and No. 2 station tunnel by dark excavation method, so that No. 1 station tunnel and No. 2 station tunnel form a combined structure of L-shaped cross section, thus realizing the connection between the two station tunnels; S4. Construction inside the station: construction of prefabricated secondary structures, construction of interlayer columns, middle plate beams, and middle plate structures of the end well middle plate and bottom plate; S5. Arrange equipment area: Arrange equipment area in the tunnel of Station No. 1 and install relevant equipment; S6. Construction of wind pavilion: Select the location for construction of wind pavilion according to ground conditions, and adopt open-cut construction or vertical excavation to construct the wind pavilion; S7. Entrance and exit construction: According to the specific geological and environmental conditions, the entrance and exit shall be constructed by pipe jacking or open cut method, and connected with the No. 1 station tunnel through the entrance and exit passage to form a complete station; It also includes the construction of interval tunnels: after the main construction of the first and second station tunnels is completed in step S2, a shield machine or a pipe jacking machine is used to excavate and complete the construction of the corresponding interval tunnels.

[0007] Furthermore, in the main construction of the No. 1 and No. 2 station tunnels in step S2, the shield machine or pipe jacking machine of the lower half of the tunneling equipment used for vertical combination to complete the main construction of the No. 1 station tunnel and the shield machine or pipe jacking machine used for the main construction of the No. 2 station tunnel are both of a parent-child structure, and the parent rectangular shield machine or pipe jacking machine contains an eccentric circular shield child machine, and the child machines of both are deviated to the lower part of the station to facilitate the coordination of the positional relationship between the section tunnel and the station platform.

[0008] Furthermore, the section tunnel construction comprises the following steps: SⅠ. Main construction of No. 1 section tunnel: After the main construction of No. 1 station tunnel is completed, the combined connection between the sub-machine and the main machine at the bottom of the No. 1 tunneling equipment is released. After the sub-machine is separated from the main machine, it continues to carry out independent mainline tunneling construction until the construction of No. 1 section tunnel is completed; SⅡ. Main construction of the No. 2 interval tunnel: After the main construction of the No. 2 station tunnel is completed, the combined connection between the sub-machine and the mother-machine under the No. 2 tunneling equipment is released. After the sub-machine detaches from the mother-machine, it continues to carry out independent main line tunnel tunneling construction until the construction of the No. 2 interval tunnel is completed.

[0009] Furthermore, the main construction of the No. 1 and No. 2 station tunnels in step S2 also includes the prefabrication steps of the segment linings of the No. 1 and No. 2 station tunnels before construction, and the segment assembly steps of assembling the segments to form the rectangular cross-section segments of the corresponding station tunnels during construction; the segment prefabrication steps include the prefabrication of the segment linings of the main segments and the segment linings of the portal segments on the No. 1 and No. 2 station tunnels; the segment assembly steps correspondingly include the assembly of the main segments and the assembly of the portal segments of the No. 1 and No. 2 station tunnels.

[0010] Furthermore, the prefabrication of the segment linings of the main segments of the No. 1 station tunnel includes prefabricating two identical U-shaped general segments, two identical straight-shaped general segments and one middle beam that make up each main segment; when prefabricating the U-shaped general segments, ensure that the heights of the two ends of the U-shaped general segments are different, and steel members are embedded on both end faces of the U-shaped general segments, and tie bars are welded inside the steel members to connect with the internal main reinforcement bars of the segments; when prefabricating the straight-shaped general segments, steel members are also embedded on both end faces of the straight-shaped general segments, and tie bars are similarly welded inside the steel members to connect with the internal main reinforcement bars, and when prefabricating the straight-shaped general segments, it is also necessary to ensure that steel plates are embedded at the set positions on one side face of the straight-shaped general segments, and stud bolts are welded on the inner side face of the steel plates; when prefabricating the middle beam, steel plates are embedded at both ends of the middle beam, and stud bolts are similarly welded on the inner side face of the steel plates.

[0011] Furthermore, when assembling the main segments of the No. 1 station tunnel, the joints between the U-shaped general segments and the straight-shaped general segments of adjacent main segments are staggered from each other.

[0012] Furthermore, the method for assembling the main segments of the No. 1 station tunnel includes abutting and welding the steel plates embedded at both ends of the middle beam to the steel plates on the two straight-shaped general segments respectively to form an H-shaped body with different heights at both ends, and then using the four ends of the H-shaped body to correspondingly abut the two ends of the two U-shaped general segments, and then fastening the mutually abutted steel members through bolts to form a rectangular structure with a middle beam connected inside as the main segment; the prefabrication of the segment linings of the portal segments of the No. 1 station tunnel includes the prefabrication of the segment linings of the edge segments at the two sides of the portal and the prefabrication of the segment linings of the detachable segments clamped between the two edge segments.

[0013] Furthermore, the precast segments of each detachable pipe section include a precast detachable segment, a U-shaped segment A or a U-shaped segment B, and a straight segment A that is combined with the U-shaped segment A or a straight segment B that is combined with the U-shaped segment B; during precasting, it is ensured that the U-shaped segment A and the U-shaped segment B are only different from the U-shaped universal segment in height at both ends, and it is ensured that one end of the U-shaped segment A has the same height as one end of the U-shaped universal segment, the other end of the U-shaped segment A has the same height as one end of the U-shaped segment B, and the other end of the U-shaped segment B has the same height as the other end of the U-shaped universal segment; at the same time, during precasting, it is ensured that the straight segment A and the straight segment B are only different from the straight universal segment in length, and the distance from the embedded steel plate on the straight segment A to one end of it is the same as the distance from the embedded steel plate on the straight segment B to one end of it, the distance from the embedded steel plate on the straight segment A to the other end of it is the same as the distance from the embedded steel plate on the straight universal segment to one end of it, and the distance from the embedded steel plate on the straight segment B to the other end of it is the same as the distance from the embedded steel plate on the straight universal segment to the other end of it.

[0014] Furthermore, the precast segments of each edge pipe section further include a precast steel vertical beam, a U-shaped segment A or a U-shaped segment B that is precast in the same way as the segments of the detachable pipe section, and a straight segment A that is combined with the U-shaped segment A or a straight segment B that is combined with the U-shaped segment B.

[0015] Furthermore, when assembling and connecting two adjacent detachable pipe sections, one uses the A scheme of combining the U-shaped segment A and the straight segment A for assembly to form an A pipe section, and the other uses the B scheme of combining the U-shaped segment B and the straight segment B for assembly to form a B pipe section, and the A pipe section and the B pipe section are alternately connected among multiple detachable pipe sections.

[0016] Furthermore, when assembling and connecting the edge pipe section and the detachable pipe section, when the adjacent detachable pipe section is an A pipe section, the edge pipe section is assembled with the A pipe section by using the B edge pipe section formed by combining the U-shaped segment B and the straight segment B, and vice versa, the A edge pipe section is assembled with the B pipe section.

[0017] Compared with the prior art, the beneficial effects of the present invention are: The present invention first uses two shield machines or pipe jacking machines for vertical combined tunneling construction to complete the main construction of the tunnel of the No. 1 station; then uses one shield or pipe jacking machine to push and complete the main construction of the tunnel of the No. 2 station; then builds several connecting channels between the tunnel of the No. 1 station and the tunnel of the No. 2 station, so that the tunnel of the No. 1 station and the tunnel of the No. 2 station form a combined structure with an L-shaped cross-section in the cross-section; thus, the combined subway station constructed by the method of the present invention can effectively meet the station functions, can protect the original key cultural relics, have less demolition, less excavation, less pipeline relocation, less nuisance to residents, and good economy. The present invention has strong feasibility and small risks. At the same time, the construction of two station tunnels of different sizes forms an L-shaped end face through local connection, which can also greatly reduce the construction time and speed up the construction progress. In addition, by using an eccentric combined circular shield tunneling machine in a rectangular-section shield or pipe jacking to continue building the interval tunnel after the station excavation and construction are completed, the integrated construction of the station (including the concourse level and the platform level) and the interval tunnel is realized, the comprehensive construction efficiency is improved, and the comprehensive goal of reducing the ground excavation construction is achieved.

[0018] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Brief Description of the Drawings

[0019] Figure 1 It is the construction flow chart of the method of the present invention; Figure 2 It is the cross-sectional structure diagram of the integrated constructed station and interval of the present invention; Figure 3 It is the state of segment assembly and pushing in the end shaft of the tunnels of the No. 1 and No. 2 stations of the present invention Figure 1 ; Figure 4 It is the state of segment assembly and pushing in the end shaft of the tunnels of the No. 1 and No. 2 stations of the present invention Figure 2 ; Figure 5 It is the L-shaped combined structure diagram after the in-station construction of the present invention; Figure 6 It is the structure diagram of the main segment of the tunnel of the No. 1 station of the present invention after assembly; Figure 7 It is Figure 5 The enlarged view of part A in Figure 8 It is the structure diagram of the A segment of the present invention after assembly; Figure 9 It is the connection structure diagram of the B segment and the entrance and exit channel of the present invention; Figure 10 is Figure 8 the enlarged view of part B in; Figure 11 the connection structure diagram of all hole pipe sections in the opening area at the entrance and exit passage; Figure 12 the connection structure diagram of all hole pipe sections in the opening area at the connection passage; Figure 13 the plan view of the subway station after the implementation of the present invention; Figure 14 the longitudinal section layout diagram of the subway station after the implementation of the present invention; Figure 15 the three - dimensional effect diagram of the station tunnel constructed by the method of the present invention when there are a launching shaft and a receiving shaft; Figure 16 the three - dimensional effect diagram of the station and the interval tunnel constructed by the method of the present invention when there is only a launching shaft.

[0020] The labels and corresponding names in the figure are: 1. No.1 station tunnel, 11. concourse level, 12. platform level, 13. main pipe section, 131. U - shaped universal segment, 132. straight - shaped universal segment, 133. middle beam, 134. steel member, 135. steel plate, 14. hole pipe section, 141. detachable segment, 142. U - shaped segment A, 143. straight - shaped segment A, 144. U - shaped segment B, 145. straight - shaped segment B, 146. steel vertical beam, 14a. edge pipe section, 14b. detachable pipe section, 2. No.2 station tunnel, 21. platform level, 3. launching shaft, 4. receiving shaft, 6. connection passage, 7. entrance and exit, 8. entrance and exit passage, 91. escalator, 92. vertical elevator, 93. stairway, 10a. No.1 interval tunnel, 10b. No.2 interval tunnel. Specific implementation method

[0021] A method for integrally constructing a station and an interval tunnel, as Figure 1-16 shown, including the construction of the station tunnel and the construction of the interval tunnel.

[0022] Among them, the construction of the station tunnel includes the following steps: S1. Construction of the end shaft: First, select the location of the station according to the ground conditions, and complete the necessary end shaft (i.e., complete the launching shaft 3). The receiving shaft 4 may or may not be available, which is determined according to the actual situation.

[0023] S2. Main construction of the tunnels of the First and Second Stations: After the launching shaft 3 is completed and meets the launching conditions, install the tunneling equipment. First, use two vertical combined rectangular shield machines or pipe jacking machines for tunneling construction to complete the main construction of the tunnel 1 of the First Station. After the tunnel 1 of the First Station is completed, then use a rectangular shield or pipe jacking machine to push and complete the main construction of the tunnel 2 of the Second Station. When assembling the construction segments and connecting the pipe joints of the two station tunnels, ensure that the assembled segment pipes with lateral reserved openings are installed at the positions where the tunnel 1 of the First Station and the tunnel 2 of the Second Station are connected to the preset connecting passage 6 and at the positions where the tunnel 1 of the First Station is connected to the preset entrance and exit passage 8, and conventional assembled main segment pipes 13 are used in other parts.

[0024] S3. Connectivity construction of the tunnels of the First and Second Stations: After the main construction of the tunnel 1 of the First Station and the tunnel 2 of the Second Station is completed, carry out lateral opening construction on the tunnel 1 of the First Station and the tunnel 2 of the Second Station. Build several connecting passages 6 between the opposite opening holes at the two positions of the tunnel 1 of the First Station and the tunnel 2 of the Second Station by the cut-and-cover method, so that the tunnel 1 of the First Station and the tunnel 2 of the Second Station form a combined structure with an L-shaped cross-section (as Figure 5 shown) to achieve the mutual connection of the two station tunnels. Specifically, the opening construction includes the following construction steps: S31. At the positions between the tunnel 1 of the First Station and the tunnel 2 of the Second Station where the connecting passage 6 needs to be opened, reinforce the soil layer between the two station tunnels. After reinforcement, conduct inspections. Only after confirming that the relevant indicators such as the strength and water seepage of the reinforced body reach the design values can the construction of the connecting passage 6 between the two tunnels be started. Among them, the soil layer reinforcement can be selected to adopt the grouting reinforcement method or the freezing method according to the actual conditions.

[0025] S32. Erect a temporary support structure at the tunnel opening position to enhance the stability of the tunnel at the opening and prevent the deformation or excessive deformation of the tunnel caused by local weakening. The temporary support structure can be adopted in a conventional manner, or can be implemented by the temporary support construction method with the application number 2024113326648 applied by the applicant on September 24, 2024 and the temporary support structure with the application number 2024223271505 applied by the applicant on September 24, 2024. Of course, when implementing the above-mentioned temporary support construction method or support structure with the application number, the corresponding components should be pre-embedded at the set positions during the prefabrication of the segment pipes.

[0026] S33. Check and once again ensure that the entire ring-shaped steel beam around the segment 14 at the tunnel opening (a ring-shaped steel structure formed by connecting all the steel members 134 adjacent to the detachable segment 141 in the U-shaped segments A142 and U-shaped segments B144 of the segment 14 at the tunnel opening, all the steel members 134 adjacent to the steel plate 135 in the straight segments A143 and straight segments B145, and the steel vertical beams 146 on both sides) is in a pairwise tightly connected state, so as to form a ring-shaped frame beam with a firmly connected integral structure around the tunnel opening.

[0027] S34. Sequentially disassemble the detachable segments 141 on each segment 14 at the reserved tunnel opening. During the disassembly process, observe and detect the stability of the soil outside the tunnel opening and whether there is water seepage. If it is unsafe, suspend the disassembly and take necessary safety measures. After treatment, continue to disassemble the parts that need to be removed from the other segments in the reserved tunnel opening until all the detachable segments in the entire reserved tunnel opening are completely disassembled.

[0028] S35. Excavate the soil between the tunnel 1 of the first station and the tunnel 2 of the second station, and construct the connecting passage 6 between the two tunnels until all the reserved passages between the two tunnels are completed.

[0029] S36. Demolish the temporary support structure.

[0030] S37. After all the reserved passages between the two tunnels are constructed, the lower half of the tunnel 1 of the first station and the tunnel 2 of the second station together form the platform floors 12 and 21 of the station through the connecting passage 6.

[0031] S4. Construction inside the station: Construct prefabricated secondary structures (including track top air ducts, platform slabs, tunnel middle slabs, etc.), construct the intermediate columns, middle slab beams, middle slab structures, etc. between the middle slab and the bottom slab of the end shaft.

[0032] S5. Layout of the equipment area: Layout the equipment area. Layout the equipment area inside the tunnel 1 of the first station, and set up escalators 91, vertical elevators 92, and stairways 93 to achieve the vertical connection of personnel from the upper station hall floor 11 to the lower platform floors 12 and 21. Among them, the escalators 91 and the stairways 93 can be longitudinally separated or arranged side by side according to the actual situation.

[0033] S6. Construction of the ventilation pavilion: According to the ground conditions, select the location for constructing the ventilation pavilion, and use open cut construction or vertical tunneling to construct the ventilation pavilion. The locations of the launching shaft 3 and the receiving shaft 4 can be used as the space for station equipment layout, and escalators and stairways 93 can also be set up. The specific architectural design inside the station is flexibly arranged according to the actual situation and requirements.

[0034] S7. Entrance and exit construction: According to the specific geological and environmental conditions, the entrance and exit 7 is constructed by the pipe jacking method or the open-cut method, and is connected and combined with the No. 1 station tunnel 1 through the entrance and exit passage 8 to form a complete station. According to needs, the entrance and exit gates and security inspection machines can be arranged in the entrance and exit passage 8 to realize the security inspection function, and the automatic ticket vending machine can be arranged in the departure shaft 3 of the entrance and exit 7 to realize the ticket purchase function.

[0035] Preferably, in step S2 of the method of this embodiment, the main construction of the No. 1 and No. 2 station tunnels also includes the prefabrication step of the pipe segments on the No. 1 station tunnel 1 and the No. 2 station tunnel 2 before construction, and the pipe segment assembly step of assembling the pipe segments to form the corresponding station tunnel rectangular section pipe segments during the construction process. Among them, the pipe segment prefabrication includes prefabrication of all the pipe segments constituting the rectangular pipe segments of the No. 1 station tunnel 1 and prefabrication of all the pipe segments constituting the rectangular pipe segments of the No. 2 station tunnel 2. The pipe segment assembly also includes assembling the corresponding pipe segments to form the rectangular section pipe segments for the No. 1 station tunnel 1 and assembling to form the rectangular section pipe segments for the No. 2 station tunnel 2. The pipe segments and pipe segments for the No. 2 station tunnel 2 can be implemented with reference to the prior art or the detachable jacking pipe segment structure with application number 2024223273341 filed by the applicant on September 24, 2024, and no detailed description will be given. This embodiment mainly introduces the prefabrication of the pipe segments of the main pipe segment 13 and the prefabrication of the pipe segments of the portal pipe segment 14 of the No. 1 station tunnel 1 and the corresponding pipe segment assembly. The main pipe segment 13 or the portal pipe segment 14 mentioned below refers to the main pipe segment 13 or the portal pipe segment 14 of the No. 1 station tunnel 1 when it is not limited to the No. 1 station tunnel 1 or the No. 2 station tunnel 2.

[0036] S21. Prefabrication of pipe segments for the No. 1 station tunnel pipe segment before construction: including prefabrication of pipe segments constituting the main pipe segment 13 of the No. 1 station tunnel 1 except for the lateral reserved opening area on the production factory and prefabrication of pipe segments for the opening pipe segment 14 located at the lateral reserved opening area of ​​the tunnel.

[0037] The precast segment of the main pipe section 13 includes precasting two identical U-shaped general segments 131, two identical straight general segments 132 and a middle beam 133 that constitute each main pipe section 13. When precasting the U-shaped general segment 131, ensure that the heights of both ends of the U-shaped general segment 131 are different, and steel members 134 are embedded on both end faces of the U-shaped general segment 131, and tension bars are welded inside the steel members 134 to connect with the internal main reinforcement bars of the segment. When precasting the straight general segment 132, steel members 134 are also embedded on both end faces of the straight general segment 132, and tension bars are similarly welded inside the steel members 134 to connect with the internal main reinforcement bars. Moreover, when precasting the straight general segment 132, it is also necessary to ensure that a steel plate 135 is embedded at a set position on one side face of the straight general segment 132, and stud bolts are welded on the inner side face of the steel plate 135. When precasting the middle beam 133, steel plates 135 are also embedded at both ends of the middle beam 133, and stud bolts are similarly welded on the inner side face of the steel plates 135.

[0038] The precast segment of the portal pipe section 14 includes precasting the segments of the edge pipe sections 14a at both sides of the portal and precasting the segments of the detachable pipe section 14b clamped between the two edge pipe sections 14a. Among them, the precast segment of each edge pipe section 14a and the precast segment of each detachable pipe section 14b both include precasting a U-shaped general segment 131, a straight general segment 132 and a middle beam 133 that are the same as the precast segments of the main pipe section 13. In addition, The precast of each detachable pipe section 14b also includes precasting a detachable segment 141, a U-shaped segment A 142 or a U-shaped segment B 144, and a straight segment A 143 combined with the U-shaped segment A 142 or a straight segment B 145 combined with the U-shaped segment B 144; the detachable segment 141 adopts a cast iron structure. The precast U-shaped segment A 142, U-shaped segment B 144, and the U-shaped general segment 131 only differ in the heights at both ends of the U-shaped structure. When precasting, ensure that one end of the U-shaped segment A 142 has the same height as one end of the U-shaped general segment 131, the other end of the U-shaped segment A 142 has the same height as one end of the U-shaped segment B 144, and the other end of the U-shaped segment B 144 has the same height as the other end of the U-shaped general segment 131. The straight segment A 143, straight segment B 145, and the straight general segment 132 only differ in length. When precasting, ensure that the distance from the embedded steel plate 135 on the straight segment A 143 to one end of it is the same as the distance from the embedded steel plate 135 on the straight segment B 145 to one end of it, the distance from the embedded steel plate 135 on the straight segment A 143 to the other end of it is the same as the distance from the embedded steel plate 135 on the straight general segment 132 to one end of it, and the distance from the embedded steel plate 135 on the straight segment B 145 to the other end of it is the same as the distance from the embedded steel plate 135 on the straight general segment 132 to the other end of it.

[0039] The prefabrication of each edge pipe segment 14a also includes prefabricating a steel vertical beam 146 and a U-shaped pipe segment A142 or a U-shaped pipe segment B144 that is the same as the pipe segment prefabricated in the detachable pipe segment 14b, and an I-shaped pipe segment A143 combined with the U-shaped pipe segment A142 or an I-shaped pipe segment B145 combined with the U-shaped pipe segment B144.

[0040] S22. The pipe segment assembly of the No. 1 station tunnel during construction includes assembling corresponding pipe segments to form a main pipe segment 13, an edge pipe segment 14a or a detachable pipe segment 14b, and includes the assembly connection between two adjacent pipe segments.

[0041] The pipe segment assembly of the main pipe segment 13 of the No. 1 station tunnel 1 is to respectively abut and weld the steel plates 135 embedded at both ends of the middle beam 133 with the steel plates 135 on the two I-shaped universal pipe segments 132 to form an H-shaped body with different heights at both ends, and then use the four ends of the H-shaped body to abut the two ends of the two U-shaped universal pipe segments 131, and then fasten the mutually abutting steel members 134 by bolts to form a rectangular structure and the main pipe segment 13 of the middle beam 133 is internally connected. When assembling and connecting two adjacent main pipe segments 13, staggered assembly is adopted so that the adjacent joints of the two adjacent pipe segments are not on the same horizontal plane.

[0042] When assembling each detachable pipe section 14b, the main pipe section 13 is assembled as a whole, and only one of the U-shaped universal pipe segments 131 of the main pipe section 13 is replaced with a U-shaped pipe segment A142 or a U-shaped pipe segment B144. Then, depending on whether the pipe section adopts a U-shaped pipe segment A142 or a U-shaped pipe segment B144, when the U-shaped pipe segment A142 is adopted, a corresponding one-line universal pipe segment 132 is replaced with a structure of a detachable pipe segment 141 connected to a one-line pipe segment A143, and finally assembled to form pipe section A. When the U-shaped pipe segment B144 is adopted, a corresponding one-line universal pipe segment 132 is replaced with a structure of a detachable pipe segment 141 connected to a one-line pipe segment B145, and finally assembled to form pipe section B. When assembling two adjacent detachable pipe sections 14b, pipe sections A and B are alternately assembled, and the detachable pipe segments 141 are ensured to be at the same height.

[0043] When the edge pipe section 14a is assembled, it corresponds to the assembly of the detachable pipe section 14b. Its detachable segment 141 is replaced with a steel vertical beam 146. The edge pipe section 14a is used to connect the main pipe section 13 and the detachable pipe section 14b. The edge pipe sections 14a on both sides of the same opening can be the same type A edge pipe section 14a or type B edge pipe section 14a, or one side can use type A edge pipe section 14a and the other side can use type B edge pipe section 14a. The selection of the edge pipe section 14a is such that when the adjacent detachable pipe section 14b is a type A pipe section, the edge pipe section 14a uses type B edge pipe section 14a, and when the adjacent detachable pipe section 14b is a type B pipe section, the edge pipe section 14a uses type A edge pipe section 14a.

[0044] It should be noted that the structure of the above-mentioned opening pipe section in the present invention is a general description of the opening pipe section on the upper platform layer of the No. 1 station tunnel for side opening to connect the access passage and the opening pipe section on the lower platform layer for side opening to connect the connecting passage. The structures of the opening pipe sections on the upper platform layer of the No. 1 station tunnel for side opening to connect the access passage and the opening pipe section on the lower platform layer for side opening to connect the connecting passage are basically the same, only there are differences in the sizes of the opening areas. Therefore, the differences in the opening pipe sections of the two opening areas only exist in the height of one end of a non-universal U-shaped segment and the length of a non-universal straight segment and the length of the detachable segment to a small extent.

[0045] Among them, in the main construction of the No. 1 and No. 2 station tunnels in step S2 of this embodiment, the lower half of the tunneling equipment used for vertically combining to complete the main construction of the No. 1 station tunnel 1, namely the shield machine or the pipe jacking machine, and the shield machine or the pipe jacking machine used for the main construction of the No. 2 station tunnel are both of the mother-and-son machine structure. Inside the mother machine, namely the rectangular shield machine or the pipe jacking machine, there is an eccentric circular shield son machine, and the son machine deviates downward in the mother machine to facilitate the coordination of the positional relationship between the interval tunnel and the station platform.

[0046] The construction of the interval tunnel includes the following steps: SⅠ. Main construction of the No. 1 interval tunnel: After the main construction of the No. 1 station tunnel 1 is completed, the combined connection relationship between the son machine and the mother machine at the lower part of the No. 1 tunneling equipment is released. After the son machine detaches from the mother machine, it continues to carry out independent main line tunnel tunneling construction until the construction of the No. 1 interval tunnel 10a is completed.

[0047] SⅡ. Main construction of the No. 2 interval tunnel: After the main construction of the No. 2 station tunnel 2 is completed, the combined connection relationship between the son machine and the mother machine at the lower part of the No. 2 tunneling equipment is released. After the son machine detaches from the mother machine, it continues to carry out independent main line tunnel tunneling construction until the construction of the No. 2 interval tunnel 10b is completed.

[0048] The present invention first uses two shield machines or pipe jacking machines to perform vertical combined excavation construction to complete the main construction of the No. 1 station tunnel; then uses a shield machine or pipe jacking machine to push and complete the main construction of the No. 2 station tunnel; then uses the dark excavation method to build several connecting passages between the No. 1 station tunnel and the No. 2 station tunnel, so that the No. 1 station tunnel and the No. 2 station tunnel form a combined structure of an L-shaped section on the cross section; thus, the combined subway station constructed by the present invention through this method can effectively meet the station function, and can achieve the goals of less demolition, less excavation, less pipeline relocation, less disturbance to the public, and good economy. The present invention can be applied to complex central urban areas, especially to the construction of subway stations under conditions where large ground excavation is limited. It has strong feasibility, low risk, and high construction efficiency, and has created a new idea for the dark excavation construction of subway stations under complex environmental conditions in central urban areas. In addition, by eccentrically combining a circular shield tunneling machine in a rectangular section shield or jacking pipe to continue building the section tunnel after completing the station excavation and construction, the comprehensive goal of integrated construction of the station (including the station hall and platform levels) and the section tunnel, improving the overall construction efficiency, and reducing ground excavation construction can be achieved.

[0049] The present invention is not limited to the above-mentioned specific implementation modes. For ordinary technicians in this field, various changes made based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A method for integrated construction of a station and a section tunnel, characterized in that: Including station tunnel construction; the station tunnel construction includes the following steps: S1. Construction of end wells: Complete the necessary end well construction; S2. Main construction of the No. 1 and No. 2 station tunnels: After the end well is completed and the conditions for starting are met, the tunneling equipment is installed, and two rectangular shield machines or pipe jacking machines are used to perform vertical combined tunneling construction to complete the main construction of the No. 1 station tunnel; after the main construction of the No. 1 station tunnel is completed, a rectangular shield machine or pipe jacking machine is used to push and complete the main construction of the No. 2 station tunnel; at the same time, ensure that the parts where the main parts of the No. 1 station tunnel and the No. 2 station tunnel need to be connected through the connecting channel and the parts where the main part of the No. 1 station tunnel needs to be connected to the entrance and exit channels are all installed with the hole pipe section with the lateral reserved opening, and the other parts are conventional main pipe sections; S3. Construction of connection between No. 1 and No. 2 station tunnels: several connecting passages are constructed between No. 1 station tunnel and No. 2 station tunnel by dark excavation method, so that No. 1 station tunnel and No. 2 station tunnel form a combined structure of L-shaped cross section, thus realizing the connection between the two station tunnels; S4. Construction inside the station: construction of prefabricated secondary structures, construction of interlayer columns, middle plate beams, and middle plate structures of the end well middle plate and bottom plate; S5. Arrange equipment area: Arrange equipment area in the tunnel of Station No. 1 and install relevant equipment; S6. Construction of wind pavilion: Select the location for construction of wind pavilion according to ground conditions, and adopt open-cut construction or vertical excavation to construct the wind pavilion; S7. Entrance and exit construction: According to the specific geological and environmental conditions, the entrance and exit shall be constructed by pipe jacking or open cut method, and connected with the No. 1 station tunnel through the entrance and exit passage to form a complete station; It also includes the construction of interval tunnels: after the main construction of the first and second station tunnels is completed in step S2, a shield machine or a pipe jacking machine is used to excavate and complete the construction of the corresponding interval tunnels.

2. The method for integrated construction of a station and a section tunnel according to claim 1, characterized in that: In the step S2, during the main construction of the No. 1 and No. 2 station tunnels, the shield machine or pipe jacking machine of the lower half of the tunneling equipment used for vertical combination to complete the main construction of the No. 1 station tunnel and the shield machine or pipe jacking machine used for the main construction of the No. 2 station tunnel are both of a mother-and-child machine structure, and the mother machine rectangular shield machine or pipe jacking machine contains an eccentric circular shield child machine, and the child machines of both are deviated toward the lower part of the station.

3. The method for integrated construction of a station and a section tunnel according to claim 2, characterized in that: The section tunnel construction comprises the following steps: SⅠ. Construction of No. 1 Section Tunnel: After the main construction of No. 1 Station Tunnel is completed, the combined connection between the sub-machine and the main machine at the bottom of the No. 1 tunneling equipment is released. After the sub-machine is separated from the main machine, it continues to carry out independent mainline tunneling construction until the construction of No. 1 Section Tunnel is completed; SⅡ. Construction of No. 2 Section Tunnel: After the main construction of No. 2 Station Tunnel is completed, the combined connection between the sub-machine and the main machine at the bottom of No. 2 tunneling equipment will be released. After the sub-machine is separated from the main machine, it will continue to carry out independent mainline tunneling construction until the construction of No. 2 Section Tunnel is completed.

4. The method for integrated construction of a station and a section tunnel according to claim 1, characterized in that: The main construction of the No. 1 and No. 2 station tunnels in step S2 also includes the prefabrication step of the pipe segments of the No. 1 station tunnel and the No. 2 station tunnel before construction, and the pipe segment assembling step of assembling the pipe segments to form corresponding rectangular section pipe segments of the station tunnels during construction; the pipe segment prefabrication step includes the pipe segment prefabrication of the main pipe segments on the No. 1 station tunnel and the No. 2 station tunnel and the pipe segment prefabrication of the portal pipe segments; the pipe segment assembling step corresponds to the assembly of the main pipe segments of the No. 1 station tunnel and the No. 2 station tunnel and the assembly of the portal pipe segments.

5. The method for integrated construction of a station and a section tunnel according to claim 4, characterized in that: The prefabrication of the pipe segments of the main pipe section of the No. 1 station tunnel includes prefabricating two identical U-shaped universal pipe segments, two identical straight-line universal pipe segments and a center beam that constitute each main pipe section; when prefabricating the U-shaped universal pipe segments, it is ensured that the heights of the two ends of the U-shaped universal pipe segments are different, and steel components are pre-embedded on both end surfaces of the U-shaped universal pipe segments, and the welded tie bars on the inner side of the steel components are connected to the internal main bars of the pipe segments; when prefabricating the straight-line universal pipe segments, steel components are also pre-embedded on both end surfaces of the straight-line universal pipe segments, and tie bars are also welded on the inner side of the steel components to connect with the internal main bars, and when prefabricating the straight-line universal pipe segments, it is also ensured that steel plates are pre-embedded at set positions on one side of the straight-line universal pipe segments, and bolts are welded on the inner side of the steel plates; when prefabricating the center beam, steel plates are also pre-embedded at both ends of the center beam, and bolts are also welded on the inner side of the steel plates.

6. The method for integrated construction of a station and a section tunnel according to claim 5, characterized in that: When the main pipe segments of the No. 1 station tunnel are assembled, the joints between the U-shaped universal pipe segments and the I-shaped universal pipe segments of two adjacent main pipe segments are staggered.

7. The method for integrated construction of a station and a section tunnel according to claim 5, characterized in that: The main pipe segment assembly method of the No. 1 station tunnel includes respectively abutting and welding the embedded steel plates at the two ends of the central beam with the steel plates on the two I-shaped universal pipe segments to form an H-shaped body with different heights at both ends, and then using the four ends of the H-shaped body to correspondingly abut the two ends of the two U-shaped universal pipe segments, and then fastening the mutually abutting steel components by bolts to form a rectangular structure and the main pipe segment of the central beam is internally connected; the pipe segment prefabrication of the portal pipe segment of the No. 1 station tunnel includes the pipe segment prefabrication of the edge pipe segments at the edges of both sides of the portal and the pipe segment prefabrication of the detachable pipe segments sandwiched between the two edge pipe segments.

8. The method for integrated construction of a station and a section tunnel according to claim 7, characterized in that: Each prefabricated pipe segment of the detachable pipe section includes a prefabricated detachable pipe segment, a U-shaped pipe segment A or a U-shaped pipe segment B, a straight pipe segment A combined with the U-shaped pipe segment A, or a straight pipe segment B combined with the U-shaped pipe segment B.

9. The method for integrated construction of a station and a section tunnel according to claim 8, characterized in that: The prefabricated pipe segment of each edge pipe section also includes a prefabricated steel vertical beam and a U-shaped pipe segment A or U-shaped pipe segment B that is the same as the pipe segment of the detachable pipe section, as well as an I-shaped pipe segment A combined with the U-shaped pipe segment A or an I-shaped pipe segment B combined with the U-shaped pipe segment B.

10. The method for integrated construction of a station and a section tunnel according to claim 9, characterized in that: When two adjacent detachable pipe segments are assembled and connected, one uses the A scheme of combining U-shaped pipe segment A and straight-line pipe segment A to form an A pipe segment, and the other uses the B scheme of combining U-shaped pipe segment B and straight-line pipe segment B to form a B pipe segment. Multiple detachable pipe segments are connected alternately by using A pipe segments and B pipe segments.

11. The method for integrated construction of a station and a section tunnel according to claim 10, characterized in that: When the edge pipe segment is assembled and connected with the detachable pipe segment, when the adjacent detachable pipe segment is the A pipe segment, the edge pipe segment is assembled with the B edge pipe segment formed by assembling the U-shaped pipe segment B and the straight pipe segment B and the A pipe segment, otherwise the A edge pipe segment is assembled with the B pipe segment.

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