A construction method and structure for constructing a transfer node by underpassing an operating station by excavation

Abstract

The present application belongs to the field of underground traffic engineering, and relates to a construction method and structure for a transfer node constructed by underground excavation under an operating station. The new station and the existing operating station are connected by a T-shaped node for transfer, and the existing operating station is not implemented in different stages during the early construction. Only a number of support piles and joists are reserved under the floor within the range of the transfer node to protect the safety of the existing operating station during the later underground excavation construction of the transfer node. When the new station is implemented adjacent to the operating station, the main structure is first constructed by open excavation and construction, then the retaining piles within the height range of the operating station are removed, the new and old structures are connected, and then the retaining piles within the range of the negative third floor of the transfer node are removed. The existing operating station is excavated by underground excavation in a combined control mode of zonal and longitudinal step excavation, the reserved pile foundation is removed as needed, the stress is smoothly converted, and the safety of the operating station above is ensured. The present application can effectively control the construction risk, realize the safety of underground excavation under the existing operating station, and further realize the transfer function, thereby achieving good economic benefits.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of underground traffic engineering, and particularly relates to a construction method and structure for constructing a transfer node by excavating under an operating station. BACKGROUND

[0002] The subway construction of each city considers factors such as construction cost and construction urgency, and adopts a method of constructing different lines in stages. For a transfer station, it is common that different lines are not constructed in the same stage. Compared with a channel transfer, a node transfer is more convenient, and a T-shaped, L-shaped, cross-shaped, and the like node transfer form is preferentially recommended.

[0003] For a transfer station not constructed in the same stage, a common method in the past is to simultaneously construct the transfer node structure of a future line when a previous operating station is implemented. In recent years, the progress of the approval of the subway construction planning of each place is slowed down, and cases in which some future lines are optimized and canceled after the adjustment of the line network planning are not rare. This will inevitably cause the waste of investment in the transfer node structure of the future line. In an area where the groundwater depth is large and the stratum is suitable for the construction of the excavation method, from the perspective of avoiding the investment risk caused by the uncertainty of the adjustment of the line network in the later stage and reducing the investment in the previous construction, the transfer node of the future line is no longer implemented simultaneously. How to reserve conditions for the excavation under construction of the future line in the most economical way is a problem to be solved urgently.

[0004] In addition, after the station constructed in the previous stage is put into operation, when the transfer node is implemented after the construction of a new line, if the method of the excavation under the construction of the operating station is not properly controlled, the operating station will be adversely affected, and the driving safety will be seriously endangered. In order to reduce the risk, a reasonable construction method needs to be adopted.

[0005] In view of the above situation, the present application provides a construction method and structure for constructing a transfer node by excavating under an operating station in the most economical and safe way, which has great practical significance. SUMMARY

[0006] In order to overcome the problems in the prior art, the present application provides a construction method and structure for constructing a transfer node by excavating under an operating station. The transfer node is implemented in different stages during the construction of the existing operating station, and a temporary support system is reserved under the bottom plate in the range of the transfer node. When the new station adjacent to the operating station is implemented, the main structure is constructed by open excavation, the retaining piles in the height range of the operating station are then removed, the new and old structures are connected, the retaining piles in the range of the negative third floor of the transfer node are then removed, the excavation under the existing operating station is implemented by adopting a combined control method of zonal and longitudinal step excavation, the temporary support system is removed as needed and converted into a permanent structure system, the stress is smoothly converted, and the safety of the operating station above is ensured. The present application can effectively control the construction risk, realize the transfer function, and achieve good economic benefits.

[0007] To achieve the above object, the application provides a construction method for constructing a transfer node by underpassing an operating station, comprising the following steps:

[0008] S1: reserving a temporary support system under the floor of the transfer node range during the prior construction of the operating station, the temporary support system comprising support piles and joists reserved under the floor, and enclosure piles and pile top corbel beams reserved on both sides of the floor cross section;

[0009] S2: locally grading the roof of the operating station near the new station during the construction of the new station, backfilling the soil after constructing a retaining wall above the roof of the operating station. The top of the shared enclosure pile shared with the existing operating station is chiseled to remove the concrete and retain the main reinforcement, a corbel beam is newly constructed according to the design height of the new station, and the main reinforcement of the shared enclosure pile is anchored into the newly constructed corbel beam;

[0010] S3: constructing the main structure of the station by open cut construction of the shield well of the new station, specifically: excavating the foundation pit from top to bottom and timely erecting supports for the shield well of the new station, backfilling the main structure of the station from bottom to top after excavating the foundation pit to the pit bottom, the main structure of the station comprising a row of structural columns and floor cross beams at the position of the shared enclosure pile adjacent to the new shield well;

[0011] S4: breaking the shared enclosure pile in the height range of the operating station at the transfer node, constructing post-cast structures and deformation joints between the operating station and the new shield well, specifically: constructing post-cast structures between the operating station and the new shield well, the post-cast structures comprising post-cast slab strips and side walls at each floor, and setting deformation joints in the width range of the broken enclosure pile;

[0012] S5: breaking the enclosure pile in the height range of the negative third floor of the shield well at the transfer node, grading the soil at a ratio of 1:1 along the longitudinal direction of the underpass, and constructing bottom cross beams and columns below the side walls of the operating station;

[0013] S6: excavating a top soil layer of a certain thickness under the floor of the operating station, as an optimization, excavating a soil layer of about 2m in thickness, and constructing bracket supports on the corbel beams of the outermost enclosure piles on both sides, the brackets connecting the corbel beams and the floor of the operating station through the pre-reserved adapters;

[0014] S7: excavating the middle soil layer in a basin shape along the cross section direction of the underpass, sequentially constructing longitudinal structural columns, bottom longitudinal beams and partial floors on both sides thereof after chiseling the pile foundations of the corresponding support piles, and realizing smooth stress conversion from the temporary support system to the permanent structure system;

[0015] S8: continuing to excavate the soil towards the enclosure pile, sequentially constructing longitudinal structural columns, bottom longitudinal beams and partial floors on both sides thereof, side walls and side wall buttresses after chiseling the pile foundations of the corresponding support piles, and realizing smooth stress conversion from the temporary support system to the permanent structure system;

[0016] S9: After the construction of the shield end wall and end wall buttress, the post-poured structure construction between the operating station and the newly-built shield well of the negative three layer is carried out. The post-poured structure includes the post-poured plate belt on both sides of the deformation joint and the negative three layer side wall.

[0017] S10: The shield end reinforcement on the side of the operating station is constructed. After the shield enters the newly-built station shield well through air pushing after entering the operating station below, the newly-built station shield well is closed. Finally, the operating station negative one layer side wall in the range of the transfer node is broken by static cutting, and the operating station and the newly-built station station hall layer are connected.

[0018] In one embodiment, the underground water depth of the station is large, the water level is lower than the bottom plate of the newly-built station, and the stratum is suitable for underground excavation method construction to pass under the operating station. The existing operating station is a two-story underground station, and the newly-built station is a three-story underground station. The T-type transfer mode is adopted, and the enclosure structure adopts bored piles.

[0019] In one embodiment, during the whole process of the construction steps S1-S10, the existing operating station structure is automatically monitored, and a hierarchical early warning is carried out. According to the deformation monitoring situation, auxiliary control measures are taken in time.

[0020] In one embodiment, in step S1, the operating station is not simultaneously implemented with the transfer node structure during the early construction. On the one hand, a plurality of support piles and joists are reserved below the bottom plate, and the number and length of the support piles need to meet the stress calculation requirements of the later excavation working condition. On the other hand, enclosure piles and pile top corbel beams are reserved below the bottom plate on both sides in the transverse direction, and the enclosure piles are appropriately outward to meet the requirements of the future shield passing through the station and the surplus space for future line flexible adjustment. In addition, the joist and the pile top corbel beam are physically close to the operating station bottom plate, which facilitates load transfer.

[0021] In one embodiment, in step S2, in the range of the transfer node, the enclosure piles on both sides of the existing operating station are designed and implemented in a containing manner according to the depth of the foundation pit of the newly-built line, so as to share the enclosure piles when the adjacent construction of the newly-built line is carried out.

[0022] In one embodiment, in step S3, in order to strengthen the protection of the existing operating station, the first support adopts reinforced concrete support, and the number of vertical support rows and the support plane spacing in the shield well range are encrypted and strengthened.

[0023] In one embodiment, in step S4, the post-poured structure on both sides of the deformation joint is designed with equal thickness, and the width of any one side plate and side wall is not less than 0.5m, so as to ensure the construction quality and waterproof effect of the deformation joint.

[0024] In one embodiment, in step S6, the corbel close to the bottom plate has a width not less than 1.2m, a height not less than 0.6m, and a length direction same as the length of the connected corbel beam.

[0025] In one embodiment, in steps S7 and S8, the structure under the operating station floor is divided into four longitudinal units in the transverse direction, including two rows of longitudinal structures in the middle and two rows of longitudinal structures on both sides, and the four longitudinal units are sequentially constructed, and the construction of the next unit is performed after the structure strength of the previous unit reaches 100%.

[0026] In one embodiment, in step S7, when the two rows of longitudinal structures in the middle are constructed, first, the longitudinal structure column, the bottom longitudinal beam and the partial floor on both sides thereof at the middle position are constructed to realize the smooth stress conversion from the first temporary support system to the permanent structure system; then, the longitudinal structure column, the bottom longitudinal beam and the partial floor on both sides thereof at the other middle position are constructed according to the same steps to realize the smooth stress conversion from the second temporary support system to the permanent structure system.

[0027] In one embodiment, in step S8, when the two rows of longitudinal structures on both sides towards the retaining pile are constructed, the soil in the range of one side close to the retaining pile is excavated, the pile foundation of the corresponding support pile is removed, and then the longitudinal structure column, the bottom longitudinal beam and the partial floor on both sides thereof, the side wall and the side wall buttress column are constructed to realize the smooth stress conversion from the third temporary support system to the permanent structure system; then, the longitudinal structure column, the bottom longitudinal beam and the partial floor on both sides thereof, the side wall and the end wall buttress column are constructed according to the same steps to realize the smooth stress conversion from the fourth temporary support system to the permanent structure system.

[0028] In one embodiment, in step S8, when the operating station floor is connected with the new side wall below, the corbel segments are segmented and broken to connect the side wall.

[0029] In one embodiment, in step S8, the spans of the side walls on both sides and the shield end wall in two directions are relatively large, which causes problems such as excessive reinforcement or calculation not meeting the requirements, and therefore the buttress columns are arranged in the walls to improve the overall stress, and the number of buttress columns is arranged according to the calculation.

[0030] The second inventive purpose of the present application is to provide a construction structure applied to the construction method of the above-mentioned underground excavation underpass operating station for constructing a transfer node, which reserves a temporary support system under the floor of the operating station in the range of the transfer node during the early construction of the operating station; and when the adjacent operating station is constructed as a new station and the underground excavation underpass the existing operating station, the reserved temporary support system is broken as needed, the temporary support system under the floor of the operating station is converted into a permanent structure system, and the smooth stress conversion from the temporary structure to the permanent structure is realized.

[0031] In one embodiment, the temporary support system includes the support piles and joists reserved under the floor of the operating station in the range of the transfer node, and the retaining piles and pile top corbel beams reserved under the floor of the operating station on both sides in the transverse direction of the transfer node.

[0032] In one embodiment, the temporary support system further comprises a retaining pile on both longitudinal sides of the operation station range of the transfer node and a corbel support made after the top crown beam of the pile.

[0033] In one embodiment, the permanent structure system is a main structure system of the newly added transfer node, which comprises a bottom cross beam and column under the side wall of the operation station, a longitudinal structure column, a bottom plate and a bottom longitudinal beam, two side walls and side wall buttress columns, a holed end wall and an end wall buttress column.

[0034] In combination with all the above technical solutions, the advantages and positive effects of the present application are: in the early construction of the existing operation station, the transfer node is implemented at different stages, and only a number of support piles and joists are reserved under the bottom plate in the range of the transfer node. When the new line is determined to be implemented, the operation station is safely and safely excavated and passed through, the reserved pile foundation is broken as needed, the stress of the temporary structure is smoothly converted to the permanent structure, the construction risk is effectively controlled, the transfer function is realized, thereby avoiding the investment waste risk caused by the uncertainty of line network adjustment, and the investment in the early construction of the transfer node can be reduced by more than 70%.

[0035] In addition, the creativity of the claims of the present application is also reflected in the following important aspects:

[0036] 1. By adopting the construction method in the present application, the operation station can be safely and safely excavated and passed through, thereby realizing the transfer function, effectively controlling the construction risk, avoiding the investment risk caused by the uncertainty of line network adjustment, reducing the investment in the early construction, achieving good economic benefits, and being expected to have great commercial value after transformation.

[0037] 2. The present application first proposes a construction method for excavating and passing through an existing operation station to implement a transfer node, adopts a joint control method of partitioning the excavation surface and excavating longitudinally in steps, first proposes a complete set of construction processes for implementing the supporting temporary structure and permanent structure, realizes the smooth stress conversion of the temporary structure to the permanent structure, effectively controls the risk, and fills the technical gap in the industry at home and abroad.

[0038] 3. In the past, it was generally believed that when the transfer node is implemented at different stages in the early construction of the station, the operation station cannot be passed through by excavation to realize the transfer function in the later stage. However, by appropriately reserving temporary measures under the previous station and cooperating with the proposed complete set of construction methods, the present application can safely and safely pass through to realize the transfer function, solving the technical problem that people have long been eager to solve but have failed to achieve success. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure;

[0040] Figure 1 Pile plan layout for pre-construction support pile of operating station;

[0041] Figure 2 Fence profile for operating station and newly-built station;

[0042] Figure 3 Structure profile for operating station and newly-built station;

[0043] Figure 4 Profile for underground excavation under operating station Figure 1 ;

[0044] Figure 5 Profile for underground excavation under operating station Figure 2 ;

[0045] Figure 6 Profile for underground excavation under operating station Figure 3 ;

[0046] Figure 7 Profile for underground excavation under operating station Figure 4 ;

[0047] Figure 8 Profile for underground excavation under operating station Figure 5 ;

[0048] Figure 9 Floor structure plan for transfer node.

[0049] In the figure: 1, support pile; 2, joist; 3, cross-section fence pile; 4, pile top corbel; 5, retaining wall; 6, first shared fence pile; 6-1, shared fence pile one; 6-2, shared fence pile two; 6-3, shared fence pile three; 7, newly-built corbel; 8, support; 9, inverted support; 10, structure column one; 11, top plate cross beam; 12, middle plate cross beam; 13, bottom plate cross beam one; 14, top plate post-cast slab strip; 15-1, middle plate post-cast slab strip one; 15-2, middle plate post-cast slab strip two; 16-1, post-cast side wall one; 16-2, post-cast side wall two; 17, deformation joint; 18, bottom plate cross beam two; 19, structure column two; 20, corbel support; 21, longitudinal structure column; 21-1, longitudinal structure column one; 21-2, longitudinal structure column two; 21-3, longitudinal structure column three; 21-4, longitudinal structure column four; 22, bottom longitudinal beam; 22-1, bottom longitudinal beam one; 22-2, bottom longitudinal beam two; 22-3, bottom longitudinal beam three; 22-4, bottom longitudinal beam four; 23, bottom plate post-cast slab strip; 24, second shared fence pile; 25, side wall one; 26, side wall buttress column one; 27, bottom plate; 28, side wall two; 29, side wall buttress column two; 30, end wall; 31, end wall buttress column. DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific implementations disclosed below.

[0051] The new station and the existing operating station in the embodiment are T-shaped node transfer, and the existing operating station is not implemented at different stages during the early construction. Only a number of support piles and joists are reserved under the floor in the transfer node range to protect the safety of the existing operating station during the transfer node excavation in the later stage. When the new station is implemented adjacent to the operating station, the main structure is constructed by open excavation, then the enclosure piles in the height range of the operating station are broken, the new and old structures are connected, then the enclosure piles in the negative three layers of the transfer node are broken, the excavation face is divided into zones and excavated longitudinally, the reserved pile foundation is broken as needed, the stress is smoothly converted, the existing operating station is safely excavated under the existing operating station, and then the transfer function is realized, which can achieve good economic benefits. Embodiment 1

[0052] The specific implementation steps of the construction method for excavating under the operating station to implement the transfer node are as follows:

[0053] S1: During the early construction of the operating station, a number of support piles 1 and joists 2 are reserved under the floor in the transfer node range, and cross-section enclosure piles 3 and pile top corbel beams 4 are reserved under the floor on both sides in the cross-section direction. If the future line is determined to be implemented, these reserved measures can ensure the operation safety of the operating station above and reduce the capital investment of the early line. If the future line is adjusted or optimized and cancelled, this most economical reserved condition can avoid the investment waste caused by the synchronous implementation of the transfer node structure of the future line in the early stage. Figure 1 as shown in the figure.

[0054] S2: During the construction of the new station, the top plate range of the operating station near the new station is locally sloped, and the earth body is backfilled after the construction of the retaining wall 5 above the top plate of the operating station. The top of the first shared enclosure pile 6 (including the shared enclosure pile one 6-1, the shared enclosure pile two 6-2, and the shared enclosure pile three 6-3 arranged from top to bottom) shared with the existing operating station is chiseled with concrete and the main reinforcement is reserved, a new crown beam 7 is newly made according to the design height of the crown beam of the new station, and the steel reinforcement of the existing first shared enclosure pile 6 is anchored into the new crown beam 7. Figure 2 as shown in the figure.

[0055] S3: New shield well is excavated from top to bottom, and support 8 and counterfort 9 are erected in time, as shown in Figure 2 , after the excavation of the foundation pit to the pit bottom, the station main structure is built from bottom to top, including a row of structural columns 10, roof beam 11, middle plate beam 12 and bottom beam 1 13 near the shared retaining pile position of the new shield well, because the roof beam and the middle plate beam are adjacent to the main structure of the operating station, the horizontal stress is relatively small, and mainly plays the role of hole edge beam of shield well opening in the early stage. The horizontal size and reinforcement can be greatly optimized compared to the case where it is not adjacent to the operating station. As shown in Figure 3 .

[0056] S4: The shared retaining pile 6-1 in the height range of the operating station at the interchange node is broken, and the post-cast structure between the operating station and the new shield well is constructed, including the roof post-cast slab belt 14, the middle plate post-cast slab belt 1 5-1, the middle plate post-cast slab belt 2 15-2, and the post-cast side wall 1 6-1 within the width range of the post-cast slab belt. The deformation joint 17 is arranged within the width range of the broken retaining pile to solve the problem of uneven settlement between the operating station and the new station. As shown in Figure 2 .

[0057] S5: The shared retaining pile 6-3 in the negative three-layer height range of the shield well at the interchange node is broken, as shown in Figure 2 , a 1:1 soil slope is formed along the longitudinal direction of the underground excavation, and temporary slope protection measures such as spraying of concrete are added as necessary to ensure the stability of the slope, and then the bottom beam 2 18 and the structural column 2 19 below the side wall of the operating station are constructed to support the side wall of the operating station. As shown in Figure 4 .

[0058] S6: The soil about 2m thick below the operating station bottom plate is excavated to provide construction space for the construction of the bracket support 20 on the crown beam of the two outermost retaining piles, and then the bracket support is constructed, as shown in Figure 4 . The bracket support connects the crown beam and the operating station bottom plate through the pre-reserved adapter, and the width of the bracket support close to the bottom plate should not be less than 1.2m, the height should not be less than 0.6m, and the length direction should be the same length as the connected crown beam to ensure the stability of the retaining pile during subsequent underground excavation, thereby controlling the construction risk, as shown in Figure 5 .

[0059] S7: The intermediate soil is excavated in the form of a basin along the transverse direction of the underground excavation, the corresponding support pile in the height range from the operating station bottom plate to the pit bottom is removed, and one of the rows of longitudinal structural columns 2 1-1, bottom longitudinal beam 2 2-1 and partial bottom plate 27 on both sides are constructed at the intermediate position to realize the smooth stress transfer from the first temporary structure system to the permanent structure. After the structure reaches the design strength, subsequent construction is carried out. As shown in Figure 5As shown. According to this step, the earthwork is excavated, the pile foundation of the corresponding support pile 1 is broken, and the other row of corresponding structures in the middle is constructed, including the longitudinal structural column two 21-2, the bottom longitudinal beam two 22-2, and the partial bottom plate 27 on both sides thereof, to realize the smooth stress conversion of the second temporary structure system to the permanent structure, as shown in Figure 6 .

[0060] S8: Excavate the soil on one side within the range of the retaining pile, break the pile foundation of the corresponding support pile, and then construct the longitudinal structural column three 21-3, the bottom longitudinal beam three 22-3, the partial bottom plate 27 on both sides thereof, the side wall one 25, and the side wall buttress column one 26, to realize the smooth stress conversion of the third temporary structure system to the permanent structure, as shown in Figure 7 and Figure 9 . According to this step, the other side of the soil is excavated and the corresponding structure is constructed, including the longitudinal structural column four 21-4, the bottom longitudinal beam four 22-4, the partial bottom plate 27 on both sides thereof, the side wall two 28, and the side wall buttress column two 29, to realize the smooth stress conversion of the fourth temporary structure system to the permanent structure, as shown in Figure 8 and Figure 9 . When connecting the bottom plate of the operating station with the lower newly-built side wall, the bracket is broken in sections to connect the side wall in sections, and the section length is recommended to be no more than 3m, to realize the smooth stress conversion of the fifth temporary structure system to the permanent structure.

[0061] The steps S7-S8 adopt the joint control method of excavation surface partitioning and longitudinal step excavation, to gradually realize the smooth stress conversion of the temporary structure system to the permanent structure, which can effectively control the construction risk and also avoid the investment risk caused by the uncertainty of the line network adjustment.

[0062] S9: After the shield end wall 30 and the end wall buttress column 31 thereof are constructed (as shown in Figure 9 ), the post-cast structure of the negative three layer between the operating station and the newly-built shield well is constructed, including the bottom plate post-cast plate belt 23 on both sides of the deformation joint and the post-cast side wall two 16-2, as shown in Figure 3 .

[0063] S10: The shield end reinforcement on one side of the operating station is constructed, the shield enters the newly-built station shield well after entering the operating station below through air pushing, receives the hoisting-out, and seals the post-cast plate of the shield opening at each layer of the newly-built station shield well. Finally, in order to reduce the influence of the breaking construction on the operating station, the static cutting method is adopted to break the operating station negative one layer side wall in the range of the transfer node, to connect the operating station with the station hall layer of the newly-built station, and to realize the transfer function. Embodiment 2

[0064] A construction structure applied to the construction method of implementing the transfer node construction method of underpassing the operating station by tunneling in Embodiment 1, a plurality of support piles 1 and joists 2 are reserved under the bottom plate in the range of the transfer node of the operating station in the early construction of the operating station, and the reserved pile foundation is broken as needed in the subsequent underpassing of the operating station by tunneling, so as to realize the smooth stress conversion from the temporary structure system to the permanent structure system, effectively control the construction risk, realize the transfer function, avoid the investment risk caused by the uncertainty of the line network adjustment, and reduce the investment in the early construction.

[0065] The temporary structure system comprises: first shared enclosing piles 6 (including shared enclosing pile one 6-1, shared enclosing pile two 6-2 and shared enclosing pile three 6-3) and second shared enclosing piles 24 arranged on the longitudinal two sides of the operating station in the range of the transfer node, cross-section enclosing piles 3 and pile top corbel beams 4 arranged under the bottom plate on both sides in the cross-section direction of the operating station in the range of the transfer node, support piles 1 and joists 2 arranged under the bottom plate of the operating station, and corbel supports 20 arranged on the pile top corbel beams. Figure 1 and Figure 5 as shown.

[0066] The permanent structure system comprises: structure column two 19 and bottom plate cross beam two 18 under the bottom plate of the operating station in the range of the transfer node, longitudinal structure column one 21-1 and bottom longitudinal beam one 22-1, longitudinal structure column two 21-2 and bottom longitudinal beam two 22-2, longitudinal structure column three 21-3 and bottom longitudinal beam three 22-3, longitudinal structure column four 21-4 and bottom longitudinal beam four 22-4, bottom plate 27, side wall one 25 and side wall counterfort column one 26, side wall two 28 and side wall counterfort column two 29, end wall 30 and end wall counterfort column 31, and the end wall 30 has two shield openings and a shield ring beam. Figure 9 as shown.

[0067] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any modification, equivalent replacement and improvement made by those skilled in the art within the technical range disclosed by the present application, as long as it is within the spirit and principles of the present application, should be covered within the protection scope of the present application.

Claims

1. A construction method for constructing a transfer node of a subway station by using a tunneling method, characterized in that: The method comprises the following steps: S1: reserving a temporary support system under the floor of the transfer node range of the operating station during the early construction, including support piles and joists, and the enclosure piles and pile top corbel beams on both sides of the floor cross section; S2: during the construction of the newly-built station, the top concrete of the enclosure piles shared with the operating station is removed and the main reinforcement is reserved, the corbel beam is newly built according to the height of the newly-built station, and the existing main reinforcement is anchored into the newly-built corbel beam; S3: the main structure of the station is constructed by open-cut construction of the shield well of the newly-built station; S4: the shared enclosure piles in the height range of the operating station are removed, and the post-cast structure and deformation joint between the operating station and the newly-built shield well are constructed; S5: the shared enclosure piles in the height range of the negative third floor of the shield well are removed, and the bottom cross beam and column under the side wall of the operating station are constructed; S6: the top soil under the floor of the operating station is excavated to a certain thickness, and the bracket support is constructed; S7: the middle soil is excavated in a basin shape along the cross section direction of the underground excavation, after the corresponding pile foundation is removed, the longitudinal structure column, bottom longitudinal beam and the partial floor on both sides are sequentially constructed; S8: the soil is continuously excavated towards the enclosure piles, after the corresponding pile foundation is removed, the longitudinal structure column, bottom longitudinal beam and the partial floor on both sides, side wall and side wall buttress column are sequentially constructed on both sides, so that the stress of the temporary support system is smoothly converted to the permanent structure system; S9: the shield end wall and end wall buttress column are constructed, and the post-cast structure of the negative third floor is constructed between the operating station and the newly-built shield well; S10: the station hall layer of the operating station and the newly-built station is connected.

2. The construction method for constructing a transfer node by underpassing an operating station according to claim 1, characterized in that: The underground water depth of the station is large, the water level is lower than the floor of the newly-built station, the stratum is suitable for the construction of the shield method, the operating station is a two-floor underground station, the newly-built station is a three-floor underground station, and the transfer mode is T-shaped, and the enclosure structure adopts the bored pile.

3. The construction method of claim 1, wherein: In step S2, during the construction of the newly-built station, the top plate range of the operating station near the newly-built station is locally sloped, the soil is backfilled after the construction of the retaining wall above the top plate of the operating station, the top concrete of the shared enclosure piles of the operating station is removed and the main reinforcement is reserved, the corbel beam is newly built according to the design height of the newly-built station, and the existing main reinforcement is anchored into the newly-built corbel beam.

4. The construction method for constructing a transfer node by underpassing an operating station according to claim 1, characterized in that: In step S3, the foundation pit of the newly-built station shield well is excavated from top to bottom and the support is erected in time, after the excavation of the foundation pit to the bottom, the main structure of the station is built from bottom to top, and the main structure of the station comprises a row of structure columns and floor cross beams constructed at the position of the shared enclosure piles adjacent to the newly-built shield well.

5. The construction method for making a transfer node by underpassing an operating station according to claim 1, characterized in that: In step S4, the enclosure piles in the height range of the operating station at the transfer node are removed, and the post-cast structure between the operating station and the newly-built shield well is constructed, the post-cast structure comprises post-cast plate strips at each floor and side walls, and the deformation joint is arranged in the width range of the removed enclosure piles.

6. The construction method for constructing a transfer node underpassing an operating station by excavation according to claim 1, characterized in that: In step S6, the top soil under the floor of the operating station is excavated to a thickness of 2m, bracket supports are respectively constructed on the corbel beams of the outermost enclosure piles on both sides, and the bracket supports are connected with the floor of the operating station through the pre-reserved connecting devices.

7. The construction method for making a transfer node under a running station by subsurface excavation according to claim 1, characterized in that: In steps S7 and S8, the structure under the floor of the operating station is divided into four longitudinal units along the cross section direction, including two rows of longitudinal structures in the middle and two rows of longitudinal structures on both sides, the four longitudinal units are sequentially constructed, and the construction of the next unit is performed after the structure strength of the previous unit reaches 100%.

8. The construction method for constructing a transfer node underpassing an operating station by excavation according to claim 7, characterized in that: In step S7, when the two rows of longitudinal structures in the middle are constructed, one row of longitudinal structure columns, bottom longitudinal beams and partial floor plates on both sides thereof in the middle are first constructed to realize the first smooth stress conversion from the temporary support system to the permanent structure system; then the other row of longitudinal structure columns, bottom longitudinal beams and partial floor plates on both sides thereof in the middle are constructed according to the same step to realize the second smooth stress conversion from the temporary support system to the permanent structure system; In step S8, when the two rows of longitudinal structures close to the enclosure piles are constructed, the soil in the range of one side close to the enclosure piles is excavated, the corresponding pile foundation is removed, and then the longitudinal structure columns, bottom longitudinal beams and partial floor plates on both sides thereof, side walls and side wall buttress columns on one side are constructed to realize the third smooth stress conversion from the temporary support system to the permanent structure system; then the longitudinal structure columns, bottom longitudinal beams and partial floor plates on both sides thereof, side walls and side wall buttress columns on the other side are constructed according to the same step to realize the fourth smooth stress conversion from the temporary support system to the permanent structure system; when the floor of the operating station is connected with the lower new side wall, the brackets are segmented and the side wall is connected.

9. The construction method for making a transfer node under a running station by subsurface excavation according to claim 1, characterized in that: In step S10, the shield end head of one side of the operating station is reinforced, the shield enters the new station shield well through air pushing after entering the operating station below the end wall, is received and hoisted out, the post-cast slab of each layer of the new station shield well is closed, and the top plate is backfilled; Finally, the side wall of the negative one layer of the operating station in the range of the transfer node is broken by static cutting, and the operating station and the new station station hall layer are connected.

10. A structure applied to a construction method of a transfer node constructed by underpassing an operating station by excavation according to any one of claims 1 to 9, characterized in that: During the early construction of the operating station, a temporary support system is reserved below the floor in the range of the transfer node, and when the new station is constructed adjacent to the operating station, the operating station is under excavated to pass through the operating station, and the temporary support system below the floor of the operating station is smoothly converted to the permanent structure system, wherein: The temporary support system includes support piles and joists reserved below the floor in the range of the transfer node, enclosure piles and pile top corbel beams reserved below the floor on both sides in the transverse direction of the transfer node; The permanent structure system is the main structure system of the new transfer node, which includes bottom beams and columns below the side wall of the operating station, longitudinal structure columns, floor and bottom longitudinal beams, side walls and side wall buttress columns on both sides, open end walls and end wall buttress columns.

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