Shield tunnel external hanging type contact channel close to operating subway and construction method
By designing the shield tunnel external contact channel in the composite formation and adopting non-blasting construction methods, the problems of contact channel design and construction in the stacked tunnel are solved, and high safety and low-cost construction results are achieved.
Patent Information
- Application Number
- CN202411710674.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-02-11
AI Technical Summary
In the stacked tunnels near the operating subway in the composite formation, the existing technology is difficult to meet the contact channel design with small clear distance and high safety requirements, and the construction method has problems such as occupying ground space and having a great impact on the deformation of existing operating subways.
The shield tunnel external contact channel design is adopted, including setting up horseshoe-shaped horizontal channels on both sides of the newly built subway upstream and downstream tunnels, and connecting through the vertical shaft of the contact channel. The construction method adopts non-blasting construction, through grouting reinforcement and concealed excavation, combined with comprehensive construction methods such as water grinding drill + splitting rod + rope saw to avoid the vibration impact caused by blasting construction.
The safety and feasibility of setting up contact channels in the composite formation is realized, the safety of subway operations is ensured, the construction costs and construction period are reduced, and the adverse impact on existing operating subways is avoided.
Smart Images
Figure CN119412095A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of subway engineering, and in particular relates to an externally mounted communication channel of a shield tunnel adjacent to an operating subway and a construction method thereof. Background Art
[0002] With the rapid development and construction of domestic subway transportation, subway route conditions are restricted by many conditions. Laying multiple tunnels under the same road can solve the current practical problems of narrow roads and reduce house demolition, and will be used more and more in subsequent subway construction. Different subway lines are often built in different phases. Under the existing operating subway tunnel route, the subsequent subway tunnel adopts the overlapping line method to solve the problem of insufficient laying space. Therefore, the subsequent subway construction faces the technical difficulties of overlapping line tunnels with long distances and small clearances close to the operating subway series. For subway tunnels, channels for personnel evacuation must be set up within a length of less than 600m. Conventional horizontal or inclined communication channels cannot meet the needs of overlapping line tunnels and personnel safe evacuation. New types must be adopted to meet the requirements of relevant specifications. Composite strata have the obvious characteristics of soft upper and hard lower. There are practical difficulties in controlling the deformation of the upper soil layer and the conventional method of digging the lower soil layer.
[0003] Therefore, when constructing a connecting passage near an operating subway in a composite stratum, operational safety must be guaranteed, and the selection of the connecting passage type, location and construction method is crucial. Summary of the invention
[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide an externally mounted communication channel of a shield tunnel adjacent to an operating subway and a construction method.
[0005] The technical solution of the present invention is: an external communication channel of a shield tunnel adjacent to an operating subway, comprising a newly built subway up-line tunnel and a newly built subway down-line tunnel adjacent to the operating subway tunnel, wherein a cross passage of an up-line communication channel is constructed on a side of the newly built subway up-line tunnel away from the operating subway tunnel, and a cross passage of a down-line communication channel is constructed on a side of the newly built subway down-line tunnel away from the operating subway tunnel, and a communication channel shaft connecting the cross passage of the up-line communication channel and the cross passage of the down-line communication channel is arranged between the two.
[0006] Furthermore, the upline communication channel transverse channel and the downline communication channel transverse channel are both horseshoe-shaped transverse channels.
[0007] Furthermore, the upline communication channel transverse channel and the downline communication channel transverse channel are arranged vertically, and the communication channel vertical shaft vertically connects the upline communication channel transverse channel and the downline communication channel transverse channel.
[0008] Furthermore, the directions of the transverse passage of the up-line communication channel and the transverse passage of the down-line communication channel are perpendicular to the directions of their respective tunnels.
[0009] Furthermore, a communication channel shaft locking ring beam is provided at the connecting position between the up line communication channel cross channel and the communication channel shaft.
[0010] Furthermore, the lower end of the communication channel vertical shaft is flush with the horizontal channel of the downline communication channel.
[0011] Furthermore, the upper end of the communication channel vertical shaft is slightly higher than the horizontal channel of the upward line communication channel.
[0012] A shield tunnel external communication channel and construction method adjacent to an operating subway, comprising the following steps: A. Construction of new subway up-line tunnel and new subway down-line tunnel; B. Carry out grouting for reinforcement of the up line, adopt non-explosive construction methods, break open the newly built subway up line tunnel, and construct the cross passage of the up line communication passage; C. Grouting is performed on the upper section of the vertical shaft of the communication channel, and the upper section of the vertical shaft of the communication channel is constructed by non-explosive construction methods; D. Use non-explosive construction methods to build new subway down-line tunnels and construct cross passages for down-line communication channels; E. Only part of the soil layer is excavated within the intersection of the cross channel of the downline communication channel and the vertical shaft of the communication channel, and the support is set up to carry out excavation, and the support is set up as the excavation progresses to support the upper soil and rock in time; F. Set the communication channel shaft lock ring beam from the upper section of the communication channel shaft, and use the rope saw cutting technology downward to construct the communication channel shaft; G. From bottom to top, construct the secondary lining structure while removing temporary supports.
[0013] Furthermore, step B performs grouting for reinforcement of the up line, adopts non-explosive construction methods, breaks open the newly built subway up line tunnel, and constructs the cross passage of the up line communication channel. The specific process is as follows: First, the upper section of the cross passage of the up-line connecting passage is grouted using a long conduit in the newly built subway up-line tunnel; Then, the reinforcement range is from 2m outside the cross channel outline of the upward line contact channel to 1m into the weathered rock layer; Afterwards, the cross channel of the upward line communication channel is supplemented with grouting using the grouting holes of the adjacent ring segments of the opening ring; Then, according to the construction requirements of the step method, the open steel segments in the special lining ring segments are removed piece by piece; Then, the tunnel door of the up-line communication channel cross passage is opened, and the up-line communication channel cross passage perpendicular to the tunnel direction is constructed; Finally, a small advance guide tube is laid for the cross channel of the upward line communication channel, and the step method is adopted for excavation. The initial branch of the cross channel of the upward line communication channel and the anchor rods of the cross channel of the upward line communication channel are constructed while excavation is going on.
[0014] Furthermore, step C performs grouting on the upper section of the vertical shaft of the communication channel, and adopts a non-explosive construction method to construct the upper section of the vertical shaft of the communication channel. The specific process is as follows: First, the upper section of the communication channel shaft is grouted using a long guide tube from the cross channel of the upward line communication channel; Then, cut off the initial branch of the upward line communication channel transverse channel at the intersection of the upward line communication channel transverse channel and the upper part of the communication channel shaft; Finally, the upper section of the connecting channel shaft parallel to the tunnel direction is constructed by step excavation, and the initial support of the connecting channel shaft arch and the anchor rods of the connecting channel shaft arch are installed while excavation is in progress.
[0015] The beneficial effects of the present invention are as follows: The present invention can realize the evacuation function of the overlapping tunnel communication channel adjacent to the operating subway tunnel by setting two horizontal channels parallel to the ground and a vertical shaft structure perpendicular to the ground in the composite stratum, thereby ensuring the safety of subway operation, reducing the project volume and saving construction costs.
[0016] In order to overcome the characteristics of the composite stratum with a soft upper part and a hard lower part, the present invention adopts grouting to reinforce the upper section, and adopts the dark excavation method for the whole construction, thus avoiding the disadvantages of the open excavation construction method such as occupying ground space, requiring the relocation of ground pipelines, and having a great influence on the deformation of the existing operating subway, thereby greatly saving the construction cost.
[0017] The present invention adopts a comprehensive construction method of water-grinding drill + splitting rod + rope saw in the lower hard rock stratum, overcomes the problem of construction difficulties in a narrow space, avoids blasting construction, greatly reduces the vibration impact on the operating subway, and ensures the safety of the operating subway. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a cross-sectional view of the external communication channel of the present invention; Figure 2 It is a plan view of the transverse channel of the up line communication channel in the present invention; Figure 3 It is a plan view of the transverse channel of the downlink communication channel in the present invention; Figure 4 is a schematic diagram of step A in the present invention; Figure 5 It is a schematic diagram of step B in the present invention; Figure 6 It is a schematic diagram of step C in the present invention; Figure 7 is a schematic diagram of step D in the present invention; Figure 8 is a schematic diagram of step E in the present invention; Fig. 9 is a schematic diagram of step F in the present invention; Fig.10 is a schematic diagram of step G in the present invention; Fig.11 It is a schematic diagram of non-explosive excavation of a transverse channel in a communication channel in the present invention; Fig.12 It is a schematic diagram of non-explosive excavation of a vertical shaft in a communication channel in the present invention; in: 1Operation of subway tunnel 2Construction of new subway up line tunnel 3 New subway down line tunnel 4 Up line contact channel cross channel 5 Downline communication channel Horizontal channel 6 Communication channel shaft 7 Uplink line communication channel cross channel advance small guide tube 8. Initial branch of the cross channel of the uplink line communication channel 9 Uplink line communication channel cross channel second lining 10 Downward line communication channel cross channel advance small catheter 11 Downward line communication channel cross channel primary branch 12 Downward line communication channel cross channel secondary lining 13 Small duct ahead of the arch of the vertical shaft of the communication channel 14 Initial support of the arch of the vertical shaft of the communication channel 15 Secondary lining of the arch of the communication channel shaft 16 Locking ring beam of the communication channel shaft 17 Communication channel shaft primary support 18 Communication channel shaft secondary lining 19 vertical shaft anchor rod for communication channel 20 horizontal channel anchor rod for communication channel of upward line 21. Anchor rod of the arch of the vertical shaft of the communication channel; 22. Anchor rod of the horizontal channel of the downlink communication channel. DETAILED DESCRIPTION
[0019] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 12 As shown, an external communication channel of a shield tunnel near an operating subway comprises a newly built subway up-line tunnel 2 and a newly built subway down-line tunnel 3 near an operating subway tunnel 1, wherein a side of the newly built subway up-line tunnel 2 away from the operating subway tunnel 1 is constructed with an up-line communication channel cross passage 4, and a side of the newly built subway down-line tunnel 3 away from the operating subway tunnel 1 is constructed with a down-line communication channel cross passage 5, and a communication channel shaft 6 connecting the up-line communication channel cross passage 4 and the down-line communication channel cross passage 5 is arranged between the two.
[0020] The up-line communication channel transverse channel 4 and the down-line communication channel transverse channel 5 are both horseshoe-shaped transverse channels.
[0021] The up-line communication channel transverse channel 4 and the down-line communication channel transverse channel 5 are arranged vertically, and the communication channel vertical shaft 6 vertically connects the up-line communication channel transverse channel 4 and the down-line communication channel transverse channel 5.
[0022] The directions of the up-line communication channel transverse channel 4 and the down-line communication channel transverse channel 5 are both perpendicular to the directions of their respective tunnels.
[0023] A communication channel shaft locking ring beam 16 is provided at the connecting position between the upward line communication channel transverse channel 4 and the communication channel shaft 6.
[0024] The lower end of the communication channel shaft 6 is flush with the downline communication channel transverse channel 5.
[0025] The upper end of the communication channel shaft 6 is slightly higher than the upward line communication channel cross channel 4.
[0026] Specifically, an upline communication channel cross channel anchor rod 21 is arranged outside the upline communication channel cross channel 4, and the upline communication channel cross channel 4 includes an upline communication channel cross channel advance small guide tube 7, an upline communication channel cross channel primary branch 8, and an upline communication channel cross channel secondary lining 9.
[0027] Specifically, a downline communication channel cross channel anchor rod 22 is arranged outside the downline communication channel cross channel 5, and the downline communication channel cross channel 5 includes a downline communication channel cross channel advance small guide tube 10, a downline communication channel cross channel primary branch 11, and a downline communication channel cross channel secondary lining 12.
[0028] Specifically, a communication channel shaft anchor rod 19 is arranged outside the communication channel shaft 6 , and the communication channel shaft 6 includes a communication channel shaft primary support 17 and a communication channel shaft secondary lining 18 .
[0029] Specifically, a communication channel shaft arch anchor 21 is provided at the top of the communication channel shaft 6, and the communication channel shaft arch includes a communication channel shaft arch advance small guide tube 13, a communication channel shaft arch primary support 14, and a communication channel shaft arch secondary lining 15.
[0030] A shield tunnel external communication channel and construction method adjacent to an operating subway, comprising the following steps: A. Construction of new subway up line tunnel 2 and new subway down line tunnel 3; B. Carry out grouting for reinforcement of the up line, adopt non-explosive construction methods, break open the newly built subway up line tunnel 2, and construct the cross passage 4 of the up line communication passage; C. Grouting is performed on the upper section of the communication channel shaft 6, and the upper section of the communication channel shaft 6 is constructed by a non-explosive construction method; D. Use non-explosive construction methods to build a new subway down-line tunnel 3 and construct a down-line connecting channel 5; E. Only part of the soil layer is excavated within the intersection of the downline communication channel cross channel 5 and the communication channel shaft 6, and the support is set up to carry out excavation, and the support is set up as the excavation progresses to support the upper soil and rock in time; F. The communication channel shaft 6 is provided with a locking ring beam 16 at the upper section thereof, and the communication channel shaft 6 is constructed by using a rope saw cutting process downward; G. From bottom to top, construct the secondary lining structure while removing temporary supports.
[0031] Step B is to carry out grouting for reinforcement of the up line, using a non-explosive construction method to break open the newly built subway up line tunnel 2 and construct the cross passage 4 of the up line communication passage. The specific process is as follows: First, the upper half section of the cross passage 4 of the up-line connecting passage is grouted by using a long conduit in the newly built up-line subway tunnel 2; Then, the reinforcement range is from 2m outside the outline of the cross channel 4 of the upward line contact channel to 1m into the weathered rock layer; Then, the cross channel 4 of the upward line communication channel is supplemented with grouting using the grouting holes of the adjacent ring segments of the opening ring; Then, according to the construction requirements of the step method, the open steel segments in the special lining ring segments are removed piece by piece; Afterwards, the tunnel door of the up-line communication channel cross channel 4 is opened, and the up-line communication channel cross channel 4 perpendicular to the tunnel direction is constructed; Finally, a small advance guide tube 7 is set for the transverse channel of the upward line communication channel, and excavation is carried out by adopting the step method. While excavating, the initial support 8 of the transverse channel of the upward line communication channel and the anchor rod 20 of the transverse channel of the upward line communication channel are constructed.
[0032] Step C: Grouting is performed on the upper section of the communication channel shaft 6. The upper section of the communication channel shaft 6 is constructed by a non-explosive construction method. The specific process is as follows: First, the upper section of the communication channel shaft 6 is grouted by using a long conduit through the upline communication channel cross channel 4; Then, cut off the initial branch 8 of the upward line communication channel transverse channel 4 at the intersection of the upper part of the communication channel shaft 6; Finally, the upper section of the communication channel shaft 6 parallel to the tunnel direction is constructed by step excavation, and the initial support 14 of the communication channel shaft arch and the anchor rod 21 of the communication channel shaft arch are constructed while excavating.
[0033] Specifically, step D adopts a non-explosive construction method to open a new subway downline tunnel 3 and construct a downline connecting channel cross channel 5. The specific process is as follows: First, the tunnel door of the newly built subway down line tunnel 3 is opened; Then, construct a new down-line communication channel cross passage 5 in the direction of the down-line tunnel 3 of the subway vertically; Afterwards, lay a small guide tube 10 ahead of the downlink line communication channel and the cross channel; Finally, the step method is adopted for excavation, and the initial support 11 of the cross channel of the down-line communication channel and the anchor rod 22 of the cross channel of the down-line communication channel are constructed while excavating.
[0034] Specifically, in step E, only part of the soil layer is excavated within the intersection of the downline communication channel transverse channel 5 and the communication channel shaft 6, and a support is set up to carry out excavation, and the support is set up as the excavation progresses, so as to support the upper soil and rock in time. The specific process is as follows: First, only about 2.0 meters of soil layer is excavated within the intersection of the downline communication channel cross channel 5 and the communication channel shaft 6; Then, the support is erected, and the support is erected as the excavation progresses, so as to support the upper soil and rock in time; Finally, the support is constructed of I-beams with a height of 2.0 meters. The horizontal spacing of the I-beams of the channel section support is 1.2 meters, and three supporting legs are installed longitudinally with a spacing of 1.55 meters.
[0035] Specifically, in step F, the upper section of the communication channel shaft 6 is provided with a communication channel shaft locking ring beam 16, and a rope saw cutting process is used downward to construct the communication channel shaft 6. The specific process is as follows: First, a locking ring beam 16 is provided at the upper section of the communication channel shaft 6; Then, the wire saw cutting process is used downward to construct the communication channel shaft 6; Finally, initial support 17, temporary cross bracing and anchor rods are constructed for the communication channel shaft while excavating.
[0036] Specifically, non-blasting construction methods are used in steps B, C, and D, and the specific process is as follows: First, the excavation depth of the tunnel entry range of the upline communication channel cross channel 4 and the downline communication channel cross channel 5 is 2m, the drill bit length is 800mm, and the effective footage of each section is about 600mm. The construction is divided into 4 rounds. First, the water drill is used to construct the peripheral holes along the edge of the tunnel gate to form an open surface. The drilling diameter is 150mm, the bite construction is carried out, and the depth is 800mm. Then, the slotting and splitting holes are constructed in the central position. The diameter of the slotting holes is 150mm, and the spacing is arranged at 500*500mm. After entering the hole, the holes are split to the periphery to the structural excavation edge line. The expansion is completed in three rounds, with a drilling depth of 800mm, the peripheral holes are biting, the slotting holes are arranged at a spacing of 500*500mm, and the drilling diameter is 150mm. Then, the arch range of the uplink connecting channel cross channel 4 and the downlink connecting channel cross channel 5 are excavated. First, a water-grinding drill is used to diagonally drill peripheral holes along the edge of the structure to open a splitting surface. The diameter of the drill hole is 150mm, and the bite construction is 800mm deep. When constructing the groove part, the remaining water drill cannot be constructed. A pneumatic drill is used to drill holes, and a pneumatic pick + inclined iron are used to perform artificial cracking until the entire excavation contour is formed. After the arch is completed, horizontal construction is carried out according to the excavation contour line. The peripheral eyes are constructed horizontally along the excavation contour line, and then the groove eyes are constructed. After the groove eyes are constructed, rock splitting is carried out. The opening length is 800mm, and the effective construction progress is not less than 600mm per round. In order to ensure construction safety, the construction is divided into upper and lower step excavation. The total height of the upper step excavation is 2.4 meters. After the upper step construction reaches the top of the channel, the lower step excavation is carried out; Finally, the excavation of the lower steps of the cross channel 4 of the upward line communication channel and the cross channel 5 of the downward line communication channel adopts "water drill + splitter" for vertical excavation, vertical drilling, vertical peripheral eyes are set up along the excavation contour line, and the bite construction is carried out until the excavation is through. According to the splitting capacity of the splitter, the excavation width of each section of the vertical drilling is 500-800mm. The excavation width cannot be too large to avoid ineffective drilling. The upward line and the downward line are excavated at almost the same time. The upward line will excavate all the channel sections and corners. The downward line will stop excavating after the vertical shaft channel section is excavated, and temporary support will be provided.
[0037] Specifically, step E adopts a non-blasting construction method, and the specific process is as follows: First, the excavation of the communication channel shaft 6 adopts the "water grinding drill + splitting rod" method. The water grinding drill bit is a Ø150*800mm steel alloy steel drill bit. During excavation, holes are first drilled along the excavation boundary of the communication channel shaft, and then holes are drilled separately in different zones, and splitting is performed in layers; Then, after the downlink line communication channel cross channel 5 is opened, drill the rope saw hole from top to bottom, and perform rope saw cutting, and carry out construction in the "water grinding drilling + rope saw cutting" mode. Water grinding drilling excavation needs to consider rock integrity, water content, excavation margin and other conditions. When using rope saw excavation, except that the rope saw hole is a through hole, when the regional rope saw is cut, it is cut in sections and layers, each layer is 3 meters, and it is forbidden to cut through at one time to prevent vertical sliding of the rock.
[0038] The present invention is used in the design and construction of a certain subway line 6 overlapping line subway. The 1260m section of Line 6 is close to the operating subway line 4 section for a long distance and overlapped under Bancang Street. The geology is a composite stratum, and technical problems that cannot be solved by existing technologies need to be solved. After many demonstrations, the design and construction adopted the invention method shown in this article, which solved the problems faced by the project and ensured the safety of the operating line. The structural system is reasonably stressed, the structure is highly safe and stable, the construction period is shortest, and the cost is low.
Claims
1. An externally mounted communication channel of a shield tunnel adjacent to an operating subway, comprising a newly built subway up-line tunnel (2) and a newly built subway down-line tunnel (3) adjacent to an operating subway tunnel (1), characterized in that: An up-line communication channel transverse passage (4) is constructed on the side of the newly built subway up-line tunnel (2) away from the operating subway tunnel (1), and a down-line communication channel transverse passage (5) is constructed on the side of the newly built subway down-line tunnel (3) away from the operating subway tunnel (1). A communication channel vertical shaft (6) is provided between the up-line communication channel transverse passage (4) and the down-line communication channel transverse passage (5) to connect the two.
2. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: The uplink line communication channel transverse channel (4) and the downlink line communication channel transverse channel (5) are both horseshoe-shaped transverse channels.
3. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: The uplink communication channel transverse channel (4) and the downlink communication channel transverse channel (5) are arranged vertically, and the communication channel vertical shaft (6) vertically connects the uplink communication channel transverse channel (4) and the downlink communication channel transverse channel (5).
4. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: The directions of the uplink communication channel transverse channel (4) and the downlink communication channel transverse channel (5) are both perpendicular to the directions of their respective tunnels.
5. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: A communication channel shaft locking ring beam (16) is provided at the connecting position between the upward line communication channel transverse channel (4) and the communication channel shaft (6).
6. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: The lower end of the communication channel vertical shaft (6) is flush with the downline communication channel transverse channel (5).
7. The external communication channel of a shield tunnel adjacent to an operating subway according to claim 1, characterized in that: The upper end of the communication channel shaft (6) is slightly higher than the upward line communication channel transverse channel (4).
8. An externally mounted communication channel and construction method for a shield tunnel near an operating subway, characterized in that: The following steps are involved: A. Construction of a new subway up line tunnel (2) and a new subway down line tunnel (3); B. Carry out grouting for reinforcement of the up line, using non-explosive construction methods to break open the newly built subway up line tunnel (2) and construct the cross passage of the up line connecting passage (4); C. Grouting the upper section of the communication channel shaft (6) using a non-explosive construction method to construct the upper section of the communication channel shaft (6); D. Using non-explosive construction methods, excavate a new subway downline tunnel (3) and construct a cross passage for the downline connection channel (5); E. Only part of the soil layer is excavated within the intersection of the downline communication channel cross channel (5) and the communication channel shaft (6), and the support is set up to carry out excavation, and the support is set up as the excavation progresses to support the upper soil and rock in time; F. The upper section of the communication channel shaft (6) is provided with a communication channel shaft locking ring beam (16), and the communication channel shaft (6) is constructed by using a rope saw cutting process downward; G. From bottom to top, construct the secondary lining structure while removing temporary supports.
9. The construction method of a shield tunnel external connecting channel adjacent to an operating subway according to claim 8, characterized in that: Step B is to perform grouting for reinforcement of the up line, using a non-explosive construction method to break open the newly built subway up line tunnel (2) and construct the up line connecting channel cross channel (4). The specific process is as follows: First, a long conduit is used in the newly built subway up-line tunnel (2) to perform grouting on the upper half section of the up-line connecting channel cross channel (4); Then, the reinforcement range is from 2m outside the outline of the cross channel (4) of the upward line contact channel to 1m into the weathered rock layer; Then, the cross channel (4) of the upward line communication channel is supplemented with grouting using the grouting holes of the adjacent ring segments of the opening ring; Then, according to the construction requirements of the step method, the open steel segments in the special lining ring segments are removed piece by piece; Then, the tunnel door of the upward line communication channel cross passage (4) is opened, and the upward line communication channel cross passage (4) perpendicular to the tunnel direction is constructed; Finally, a small advance guide tube (7) is set for the up-line communication channel transverse channel, and excavation is carried out using a step method, and while excavation is being carried out, an initial branch (8) for the up-line communication channel transverse channel and an anchor rod (20) for the up-line communication channel transverse channel are constructed.
10. The construction method of a shield tunnel external connection channel adjacent to an operating subway according to claim 8, characterized in that: Step C is to perform grouting on the upper section of the communication channel shaft (6) by adopting a non-explosive construction method to construct the upper section of the communication channel shaft (6). The specific process is as follows: First, grouting is performed on the upper section of the communication channel shaft (6) through the upward line communication channel cross channel (4) using a long conduit; Then, the primary branch (8) of the upward line communication channel cross channel (4) is cut off at the intersection of the upper part of the communication channel shaft (6); Finally, the upper section of the connecting passage shaft (6) parallel to the tunnel direction is constructed by step excavation, and the initial support (14) of the connecting passage shaft arch and the anchor rod (21) of the connecting passage shaft arch are constructed while excavating.