Non-excavation up-down synchronous overlapping construction method of underground bunched structure

Abstract

The invention discloses a non-excavation up-down synchronous overlapping construction method of an underground bunched structure. The method is used for developing a building containing a basement in a safety protection area of urban rail transit and comprises the following specific steps that 1, a first working well, an overground structure reinforced concrete conversion plate, an underground structure reinforced concrete conversion plate and a second working well are sequentially arranged on one side of an existing tunnel in the length direction of the existing tunnel; 2, jacking construction of all pipe joints of the bunching structure is completed; 3, construction of the binding structure is completed, and meanwhile construction of the overground first layer of the upper structure containing the basement building is conducted; 4, basement construction in the bunching structure is completed, and meanwhile, construction, not higher than three layers, of the upper structure of the building containing the basement is conducted; and 5, all construction of the superstructure containing the basement building is completed. According to the method, the influence of large-scale development along the subway on the adjacent operation shield tunnel is reduced, the construction risk is controlled, the construction period is shortened, the project investment is reduced, and better economic and social benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground bundled structure construction, and in particular to a trenchless upper and lower synchronous superposition construction method of an underground bundled structure. Background Art

[0002] In recent years, the construction of underground rail transit has guided the rapid urbanization process, especially in megacities such as Beijing, Shanghai, Guangzhou and Shenzhen.

[0003] The construction and operation of the subway has led to a rapid appreciation of the land along the line, effectively promoting the commercial development of surrounding plots. The shield method is often used to implement the subway's section tunnels. The shield tunnel is a flexible structure assembled from block and ring segments, and is extremely sensitive to longitudinal deformation. When there is close-range and large-scale foundation pit excavation along the longitudinal direction of the shield tunnel, the overload and unloading problems often cause large lateral and upward deformations of the tunnel structure. Severe cases can cause obvious water leakage and even uneven deformation of vehicle rails, affecting normal operations. There are too many related cases to list, so I will not go into details one by one.

[0004] The conventional practice in the engineering community is to strictly control the distance between the foundation pits and subway facilities developed along the line and to delineate safety protection zones. For example, Shenzhen stipulates in the "Construction Management Measures for Urban Rail Transit Safety Protection Zones": 50 meters outside the perimeter of underground stations and tunnels, 30 meters outside the outer edge of ground and elevated stations and line tracks, and 10 meters outside entrances and exits, wind shelters, substations and other ancillary facilities are urban rail transit safety protection zones. Strict control measures and deformation indicators are proposed accordingly, such as the addition of a middle partition wall in the overall plan for the foundation pit, which is divided into open excavation and has a long construction period; the implementation of retaining wall types with greater rigidity, foundation reinforcement, servo support, precipitation recharge, etc.; and automatic monitoring of displacement, settlement, groundwater, etc.

[0005] However, the core problem of this practice is that even if corresponding measures are taken for close-range, large-volume foundation pit excavation along the longitudinal direction of the shield tunnel, the problem of unloading soil first and then controlling it cannot be avoided, which poses a major safety hazard; at the same time, the core measure for controlling deformation, cement soil reinforcement, is a hidden construction item, and the phenomenon of cutting corners is rampant, and the construction quality cannot be ensured. In addition, soil reinforcement and zoning construction are temporary projects, which are cumbersome to construct and cause a lot of investment waste.

[0006] Therefore, how to reduce the impact of large-scale development along the subway line on the adjacent operating shield tunnels, control construction risks, shorten the construction period, and reduce project investment has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a trenchless upper and lower synchronous overlapping construction method of an underground bundled structure, the purpose of which is to reduce the impact of large-scale development along the subway line on the adjacent operating shield tunnels, control construction risks, shorten the construction period, and reduce project investment.

[0008] To achieve the above-mentioned purpose, the present invention discloses a trenchless upper and lower synchronous superposition construction method of an underground bundled structure, which is used for the development of a building containing a basement in a safety protection zone of urban rail transit. The specific steps are as follows:

[0009] Step 1: On one side of the existing tunnel, a first working well, an above-ground and underground reinforced concrete transfer plate and a second working well are sequentially arranged along the length direction of the existing tunnel;

[0010] Step 2: Complete the jacking construction of each pipe segment of the bundled structure;

[0011] Step 3: completing the construction of the bundled structure and simultaneously carrying out the construction of the first floor above ground of the upper structure including the basement building;

[0012] Step 4: Complete the construction of the basement in the bundled structure, and at the same time, carry out the construction of the upper structure of the building including the basement not higher than three floors above ground;

[0013] Step 5: Complete the entire construction of the superstructure including the basement building.

[0014] Preferably, step 1 is as follows:

[0015] Step 1.1, cleaning the surface soil of the area outside the existing tunnel corresponding to the area where the above-ground and underground structure reinforced concrete conversion plates are to be constructed, and each area where the working well is to be set up;

[0016] Step 1.2, construct the retaining wall and top ring beam of each working pit and the reinforced concrete conversion plate of the above-ground and underground structures;

[0017] The two sides of the above-ground and underground structure reinforced concrete conversion plates parallel to the length direction of the existing tunnel are reserved for subsequent conversion plate corrugated pipes for pulling prestressed tendons through the external wall, as well as related measures as prestressed tension anchorage ends. The following corresponding to each position where a column is set, column reinforcement is reserved;

[0018] Step 1.3, excavating the foundation pit of each working pit.

[0019] More preferably, in step 1.1, the elevation of the surface loose soil clearing is the bottom elevation of the reinforced concrete transfer plate of the above-ground and underground structures.

[0020] More preferably, the thickness of the reinforced concrete conversion plate of the above-ground and underground structures meets the requirements of the subsequent underground segmented dark excavation construction stage and the use stage as the top plate of the building containing the basement, and the plane size is 300mm to 500mm larger than the plane range of the building containing the basement.

[0021] More preferably, the two working shafts are in the shape of long strips perpendicular to the plane of the existing tunnel; in the direction perpendicular to the existing tunnel in the plane dimension, they extend 1.5m to 2m beyond the plane range of the basement building; in the direction parallel to the existing tunnel in the plane dimension, they are no more than 6 meters; and the depth is more than 1.5m deeper than the lower edge of the pipe section at the bottom of the bundled structure.

[0022] More preferably, in step 1.2, the above-ground and underground structural reinforced concrete conversion plates and the retaining walls and top ring beams of each of the working pits are cast at the same elevation and integrally.

[0023] More preferably, each of the reserved column steel bars is a type of thrown bar or steel bar connector.

[0024] Preferably, step 2 is as follows:

[0025] Step 2.1, jacking all the pipe sections of the bundled structure from one working well to another working well in the soil below the reinforced concrete transfer plate of the above-ground and underground structures;

[0026] Every two adjacent pipe sections are connected by a lock;

[0027] The outer dimensions and wall thickness of the pipe segment are designed by a two-stage force analysis envelope, including the subsequent underground segmented dark excavation construction stage and the use stage as the basement outer wall and bottom raft slab of the basement building;

[0028] Step 2.2, after the jacking construction of all the pipe segments of the bundled structure is completed, the above-ground and underground structure reinforced concrete conversion plates can be used as construction sites to carry out the construction of the upper structure of the building including the basement, and the above-ground and underground structure reinforced concrete conversion plates can be used as the basement top plates in the use stage;

[0029] The number of construction floors of the superstructure of the basement building is determined by calculating the bearing capacity of the soil in the bundled structure and shall not exceed one floor above ground.

[0030] Preferably, step 3 is as follows:

[0031] Step 3.1, in each of the pipe segments, using the reserved openings on the corresponding pipe segment webs to penetrate the pipe segment inner corrugated pipe, and using the pipe segment inner corrugated pipe to pull and penetrate the prestressed steel strands;

[0032] Step 3.2, pouring concrete in and between all the pipe sections of the bundled structure except the bottom corner pipe section;

[0033] Step 3.3, tensioning the prestressed steel strands of the tube section at the bottom of the bundled structure in the two bottom corner tube sections, anchoring the tensioned prestressed steel strands in the two bottom corner tube sections, and pouring concrete in the two bottom corner tube sections;

[0034] Step 3.4: on the above-ground and underground structure reinforced concrete conversion plate, tension the prestressed steel strands of the pipe segments of the bundled structure side walls, anchor the tensioned prestressed steel strands to the above-ground and underground structure reinforced concrete conversion plate through anchor ends, and seal the holes.

[0035] Preferably, step 4 is as follows:

[0036] Step 4.1, excavating the first dark excavation section from one working well to another working well in the bundled structure to form a first underground construction space with slope;

[0037] The width of each of the underground spaces is less than 18 meters, covering the width of two two-hip column grids in the bundled structure;

[0038] The width of each column grid is between 6 meters and 8.4 meters;

[0039] Step 4.2, spraying concrete on the surface of the slope to ensure stability;

[0040] Step 4.3, constructing basement columns and beams of each underground space;

[0041] Whether to continue the construction of the upper structure including the basement building is determined by the soil in the bundled structure and the overall force calculation of the bundled structure;

[0042] Before the construction of the basement of a building with a basement is completed, the construction height of the superstructure of the building with a basement shall not exceed three floors;

[0043] Step 4.4, within the bundled structure, continue excavating the next dark excavation section along the existing slope toward another working shaft to form the next underground construction space with the next slope, and repeat steps 4.2 to 4.4 to excavate section by section and construct the basement columns and beams and slabs at corresponding positions until another working shaft.

[0044] Beneficial effects of the present invention:

[0045] The present invention reduces the impact of large-scale development along the subway line on adjacent operating shield tunnels, controls construction risks, shortens the construction period, reduces project investment, and has better economic and social benefits.

[0046] The present invention converts the longitudinal large-volume foundation pit excavation of the subway shield tunnel into a bundled structure dark excavation of a point-like small working pit foundation pit and micro-disturbance construction. The bundled structure forms an integral structure that can bear lateral forces by tensioning prestressed tendons to form a discrete, small-section rectangular steel pipe group, breaking the whole into parts, without sensible disturbance, and with low construction risk.

[0047] In the present invention, the enclosed internal soil is excavated after the bundled structure is formed, and the structure is constructed first and then the soil is excavated, which fundamentally solves the problem of unloading the soil first and then controlling it in the open excavation method. At the same time, the structural rigidity is large, and the deformation of the existing tunnel can be better controlled. At the same time, the dark excavation operation after the bundled structure is formed realizes the superimposed development of the synchronous construction of the upper and lower structures, which can shorten the construction period to the greatest extent.

[0048] The present invention can optimize more temporary projects such as retaining walls, soil reinforcement, servo support, rainfall recharge, etc. The bundled structure serves as both the basement floor and the exterior wall, achieving a combination of permanent and temporary, and is green and environmentally friendly.

[0049] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 The plan view of the first working shaft, the above-ground and underground reinforced concrete transfer plates and the second working shaft on one side of the existing tunnel in one embodiment of the present invention is shown.

[0051] Figure 2 A schematic diagram showing the completion of step 1 in an embodiment of the present invention is shown.

[0052] Figure 3 A schematic diagram showing the completion of step 2 in an embodiment of the present invention is shown.

[0053] Figure 4 A schematic diagram showing the completion of step 3 in an embodiment of the present invention is shown.

[0054] Figure 5 A schematic diagram showing the completion of the first dark excavation section in step 4 in one embodiment of the present invention.

[0055] Figure 6 A schematic diagram showing the completion of the next dark excavation section in step 4 in one embodiment of the present invention.

[0056] Figure 7 A schematic diagram showing the completion of step 5 in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0057] Example

[0058] like Figures 1 to 5 As shown, the trenchless upper and lower synchronous superposition construction method of the underground bundled structure is used for the development of the basement building 9 within the urban rail transit safety protection zone, and the specific steps are as follows:

[0059] Step 1, on one side of the existing tunnel 1, a first working shaft 5, an above-ground and underground structure reinforced concrete transfer plate 4 and a second working shaft 5 are sequentially arranged along the length direction of the existing tunnel 1;

[0060] Step 2, completing the jacking construction of each pipe segment 8 of the bundled structure;

[0061] Step 3, completing the construction of the bundled structure, and simultaneously carrying out the construction of the first floor above ground of the upper structure including the basement building 9;

[0062] Step 4: Complete the construction of the basement in the bundled structure, and at the same time, carry out the construction of the upper structure of the building 9 including the basement, which is not higher than three floors above ground;

[0063] Step 5: Complete the entire construction of the upper structure including the basement building 9.

[0064] like Figure 3 As shown, in some embodiments, step 1 is specifically as follows:

[0065] Step 1.1, cleaning the surface soil of the area outside the existing tunnel 1 corresponding to the area where the above-ground and underground structure reinforced concrete conversion plates 4 are to be constructed, and each area where the working well 5 is to be set up;

[0066] Step 1.2, construct the retaining wall and top ring beam of each working well 5 and the above-ground and underground structure reinforced concrete transfer plates 4;

[0067] The two sides of the above-ground and underground structure reinforced concrete conversion plate 4 parallel to the length direction of the existing tunnel 1 are reserved for the subsequent conversion plate corrugated pipe 6 for the external wall to pull the prestressed tendons, as well as the relevant measures as the prestressed tension anchorage end. The column reinforcement 7 is reserved for each column setting position below;

[0068] Step 1.3, excavate the foundation pit of each working shaft 5.

[0069] In some embodiments, in step 1.1, the elevation of the surface soil cleaning is the bottom elevation of the reinforced concrete transfer plate 4 of the above-ground and underground structures;

[0070] The thickness of the above-ground and underground structure reinforced concrete conversion plate 4 meets the requirements of the subsequent underground segmented dark excavation construction stage and the use stage as the top plate of the basement building 9. The plane size is 300mm to 500mm larger than the plane range 3 of the basement building 9, so as to meet the needs of the subsequent edge tensioning and anchoring prestressed exterior wall construction;

[0071] The two working shafts 5 are in the shape of long strips perpendicular to the plane of the existing tunnel 1; in the direction perpendicular to the existing tunnel 1, they extend 1.5m to 2m beyond the plane range 3 including the basement building 9 to meet the width space requirements of the subsequent pipe segment 8 jacking equipment; in the direction parallel to the existing tunnel 1, they are no more than 6 meters. On the premise of meeting the rear supporting space of the pipe segment 8 jacking equipment, the large-volume foundation pit excavation in the longitudinal direction of the existing tunnel 1 is converted into a point-shaped small foundation pit excavation to better control the impact on the existing tunnel 1; the depth is more than 1.5m deeper than the lower edge of the pipe segment 8 at the bottom of the bundled structure;

[0072] In step 1.2, the above-ground and underground reinforced concrete transfer plates 4 and the retaining walls and top ring beams of each working shaft 5 are cast as a whole at the same elevation;

[0073] Each reserved column reinforcement 7 is a type of thrown reinforcement or reinforcement connector.

[0074] like Figure 4 As shown, in some embodiments, step 2 is specifically as follows:

[0075] Step 2.1, from one working well 5 to another working well 5, all the pipe sections 8 of the bundled structure are pushed into the soil below the reinforced concrete transfer plate 4 of the above-ground and underground structures; every two adjacent pipe sections 8 are connected by locks;

[0076] Step 2.2, after all the pipe segments 8 of the bundled structure are pushed in, the reinforced concrete conversion plate 4 of the above-ground and underground structures is used as the construction site to carry out the construction of the upper structure including the basement building 9, and the reinforced concrete conversion plate 4 of the above-ground and underground structures is used as the top plate of the basement in the use stage, so as to realize the combination of permanent and temporary and the free choice of the upper structure type;

[0077] The number of construction floors of the superstructure including the basement building 9 shall be determined by the bearing capacity of the soil in the bundled structure and shall not exceed one floor above ground;

[0078] In practical applications, the outer dimensions and wall thickness of the pipe segment 8 are designed by a two-stage force analysis envelope, including the subsequent underground segmented dark excavation construction stage and the use stage as the basement outer wall and bottom raft slab of the basement building 9.

[0079] In some embodiments, step 3 is as follows:

[0080] Step 3.1, in each pipe segment 8, the reserved opening on the web of the corresponding pipe segment 8 is used to penetrate the pipe segment inner corrugated pipe, and the prestressed steel strand 10 is pulled and penetrated by using the pipe segment inner corrugated pipe;

[0081] Step 3.2, pouring concrete 11 in and between all the pipe sections 8 of the bundled structure except the bottom corner pipe section;

[0082] Step 3.3, tensioning the prestressed steel strands 10 of the tube section 8 at the bottom of the bundled structure in the two bottom corner tube sections, anchoring the tensioned prestressed steel strands 10 in the two bottom corner tube sections, and pouring concrete 13 in the two bottom corner tube sections;

[0083] Step 3.4, on the above-ground and underground structure reinforced concrete conversion plate 4, the prestressed steel strands 10 of the pipe segments of the side wall of the tensioned structure are tensioned, and the tensioned prestressed steel strands 10 are anchored on the above-ground and underground structure reinforced concrete conversion plate 4 through the anchoring ends 12, and the holes are sealed;

[0084] like Figure 4 As shown, in actual application, the present invention forms an integral force-bearing binding structure including the above-ground and underground structure reinforced concrete conversion plates 4 under the above-ground and underground structure reinforced concrete conversion plates 4 through the above-mentioned steps.

[0085] At this stage, the upper structure of the basement building 9 can determine whether to continue the additional floor construction based on the soil in the bundled structure and the overall force calculation of the bundled structure.

[0086] Prestressing, grouting inside the corrugated pipe and anchoring are all routine operations in post-tensioning prestressing construction and will not be elaborated here.

[0087] like Figure 5 and Figure 6 As shown, in some embodiments, step 4 is specifically as follows:

[0088] Step 4.1, excavating the first dark excavation section from one working shaft 5 to another working shaft 5 in the bundled structure to form a first underground construction space with a slope 14;

[0089] The width of each underground space is less than 18 meters, covering the width of two two-hip column grids in the bundled structure;

[0090] The width of each hip column net is between 6 meters and 8.4 meters;

[0091] Step 4.2, spray concrete on the surface of the slope 14 to ensure stability;

[0092] Step 4.3, constructing basement columns 15 and beams 16 of each underground space;

[0093] Step 4.4, in the bundled structure, continue to excavate the next dark excavation section along the existing slope 14 toward another working shaft 5, forming the next underground construction space with the next slope 14, and repeat steps 4.2 to 4.4 to excavate section by section and construct the basement columns 15 and beams and slabs 16 at the corresponding positions until another working shaft 5.

[0094] Whether to continue the construction of the upper structure of the building including the basement 9 is determined by the calculation of the overall force of the soil within the bundled structure and the bundled structure; before the basement construction of the building including the basement 9 is completed, the construction height of the upper structure of the building including the basement 9 shall not exceed three floors.

[0095] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A trenchless upper and lower synchronous superposition construction method for an underground bundled structure; characterized in that: For the development of basement buildings (9) within the urban rail transit safety protection zone, the specific steps are as follows: Step 1, on one side of the existing tunnel (1), a first working shaft (5), an above-ground and underground reinforced concrete transfer plate (4) and a second working shaft (5) are sequentially arranged along the length direction of the existing tunnel (1); Step 2, completing the jacking construction of each pipe segment (8) of the bundled structure; Step 3, completing the construction of the bundled structure, and simultaneously carrying out the construction of the first floor above ground of the upper structure including the basement building (9); Step 4, completing the construction of the basement in the bundled structure, and at the same time carrying out the construction of the upper structure of the building (9) including the basement and not higher than three floors above ground; Step 5: Complete the entire construction of the upper structure (9).

2. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 1 is characterized in that: Step 1 is as follows: Step 1.1, cleaning the surface soil of the area outside the existing tunnel (1) corresponding to the area where the above-ground and underground structure reinforced concrete conversion plates (4) are to be constructed, and each area where the working well (5) is to be set up; Step 1.2, constructing the enclosure wall and top ring beam of each working well (5) and the above-ground and underground structure reinforced concrete conversion plates (4); The two sides of the above-ground and underground structural reinforced concrete conversion plates (4) parallel to the length direction of the existing tunnel (1) are reserved for conversion plate corrugated pipes (6) for subsequent external wall penetration and prestressing reinforcement, as well as related measures as prestressing tension anchorage ends, and column reinforcement (7) is reserved for each column setting position below; Step 1.3, opening the foundation pit of each working well (5).

3. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 2 is characterized in that: In step 1.1, the elevation of the surface soil cleared is the bottom elevation of the above-ground and underground structure reinforced concrete conversion plate (4).

4. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 2 is characterized in that: The thickness of the above-ground and underground structural reinforced concrete conversion plate (4) meets the requirements of the subsequent underground segmented dark excavation construction stage and the use stage as the top plate of the basement building (9). The plane size is 300mm to 500mm larger than the plane range (3) of the basement building (9) to meet the subsequent edge tensioning and anchoring prestressed exterior wall construction needs.

5. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 2 is characterized in that: The two working shafts (5) are in the shape of long strips perpendicular to the plane of the existing tunnel (1); in the direction perpendicular to the existing tunnel (1), they extend 1.5m to 2m beyond the plane range (3) containing the basement building (9) to meet the width and space requirements of the subsequent pipe segment (8) jacking equipment; in the direction parallel to the existing tunnel (1), they are no more than 6 meters, and on the premise of meeting the subsequent supporting space for the pipe segment (8) jacking equipment, the large-scale foundation pit excavation in the longitudinal direction of the existing tunnel (1) is converted into a small-scale foundation pit excavation in the form of points, so as to better control the impact on the existing tunnel (1); the depth is more than 1.5m deeper than the lower edge of the pipe segment (8) at the bottom of the bundled structure.

6. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 2 is characterized in that: In step 1.2, the above-ground and underground structural reinforced concrete conversion plates (4) and the retaining walls and top ring beams of each working well (5) are cast integrally at the same elevation.

7. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 2 is characterized in that: Each of the reserved column steel bars (7) is of the type of thrown bars or steel bar connectors.

8. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 1 is characterized in that: Step 2 is as follows: Step 2.1, from one working well (5) to another working well (5), all the pipe sections (8) of the bundled structure are pushed into the soil below the reinforced concrete conversion plate (4) of the above-ground and underground structures; every two adjacent pipe sections (8) are connected by locking buckles; Step 2.2, after all the pipe sections (8) of the bundled structure are pushed in, the reinforced concrete conversion plate (4) of the above-ground and underground structures is used as the construction site to carry out the construction of the upper structure including the basement building (9), and at the same time, the reinforced concrete conversion plate (4) of the above-ground and underground structures is used as the top plate of the basement in the use stage, so as to realize the combination of permanent and temporary, and the free choice of the upper structure type; The number of construction layers of the upper structure of the basement-containing building (9) is determined by calculating the bearing capacity of the soil in the bundled structure and shall not exceed one layer above ground; The outer dimensions and wall thickness of the pipe segment (8) are designed based on a two-stage force analysis envelope, including the subsequent underground segmented dark excavation construction stage and the use stage as the basement outer wall and bottom raft slab of the basement building (9).

9. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 1 is characterized in that: Step 3 is as follows: Step 3.1, in each of the pipe segments (8), a pipe segment inner corrugated pipe is installed by using the reserved opening on the web of the corresponding pipe segment (8), and the prestressed steel strand (10) is pulled and installed by using the pipe segment inner corrugated pipe; Step 3.2, pouring concrete (11) inside and between all the pipe sections (8) of the bundled structure except the bottom corner pipe section; Step 3.3, tensioning the prestressed steel strands (10) of the tube section (8) at the bottom of the bundled structure in the two bottom corner tube sections, anchoring the tensioned prestressed steel strands (10) in the two bottom corner tube sections, and pouring concrete (13) in the two bottom corner tube sections; Step 3.4, on the above-ground and underground structure reinforced concrete conversion plate (4), tension the prestressed steel strands (10) of the pipe segments of the bundled structure side wall, anchor the tensioned prestressed steel strands (10) on the above-ground and underground structure reinforced concrete conversion plate (4) through the anchoring end (12), and perform a sealing treatment.

10. The trenchless upper and lower synchronous superposition construction method of the underground bundled structure according to claim 1, characterized in that: Step 4 is as follows: Step 4.1, excavating the first dark excavation section from one working well (5) to another working well (5) in the bundled structure to form a first underground construction space with slope (14); The width of each of the underground spaces is less than 18 meters, covering the width of two two-hip column grids in the bundled structure; The width of each column grid is between 6 meters and 8.4 meters; Step 4.2, spraying concrete on the surface of the slope (14) to ensure stability; Step 4.3, constructing the basement columns (15) and beams (16) of each underground space; at the same time, constructing an additional layer of the upper structure (9) at the corresponding vertical projection position with a construction height not exceeding three layers; Step 4.4, within the bundled structure, continue excavating the next dark excavation section along the existing slope (14) toward another working shaft (5), forming the next underground construction space with the next slope (14), and repeat steps 4.2 to 4.4 to excavate section by section and construct the basement columns (15) and the beams and slabs (16) at the corresponding positions until another working shaft (5).

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