A method for integrated construction of a subway open-cut station auxiliary structure

Abstract

The present application relates to a kind of subway open cut station auxiliary structure integrated construction method, it is used for city subway two-line shared station station hall or with intercity station connection etc. Large station, the space requirement of station is appropriately increased, so as to subway station auxiliary structure integrated design, when construction, the longitudinal connection opening of station auxiliary structure and station hall layer main body structure needs to consider the connection opening range of integrated auxiliary structure and main body structure, the shared of enclosure crown beam in the connection opening range, the construction and removal of concrete pouring pile and net spraying anchor;After the completion of station main body structure construction, secondary construction auxiliary structure, the waterproof construction of construction joint and deformation joint in the connection opening range of main body structure;And in the connection opening range, the construction method of complex process such as auxiliary bottom plate structure reserved post-cast strip, support replacement, skip warehouse secondary pouring etc. The station auxiliary structure integrated construction method provided by the present application can well solve the construction problem of large space opening connection of subway station auxiliary structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground traffic engineering, and particularly relates to a construction method for an integrated station and auxiliary structure of a subway open-cut station, and in particular to a construction method for a connection part between an auxiliary structure and a main structure which is blocked by an enclosure structure when the auxiliary structure and the main structure are constructed in stages. BACKGROUND

[0002] With the continuous increase in passenger flow during peak hours in large cities, some subway open-cut station projects in cities have large stations such as station halls shared by two lines or intercity station connections. In order to optimize the transfer flow line, improve the utilization efficiency of the public area of the station, and promote the integration of the station and the city, the station and the auxiliary structure gradually develop in the direction of integrated development space.

[0003] In particular, the integrated construction of the station and the auxiliary structure is affected by factors such as the limitation of temporary land for city subway construction, the complex stress system of simultaneous construction of the auxiliary structure and the main structure of the station, too many construction procedures, and many construction safety hazards. When the auxiliary structure is constructed, the original main enclosure structure in the connection range needs to be removed, and then the structure is constructed in longitudinal sections to form a whole with the main structure. The connection range is a weak part of the station, and if the construction procedure is improper, it will affect the integrity of the station and reduce the service life of the station. In addition, most stations are built in underground space, which increases the number of construction joints and deformation joints in the connection range, increases the risk of station leakage, and is prone to water leakage, causing problems such as water accumulation in the station, concrete corrosion, and steel reinforcement corrosion, which seriously affects the durability, safety, and reliability of the station structure. Therefore, it is urgent to propose a construction method for an integrated auxiliary structure of a subway station to solve the construction problem of the large space opening and connection of the auxiliary structure into the station.

[0004] In addition, on the one hand, there are differences in understanding of the technical personnel in the field; on the other hand, the applicant has studied a large number of literatures and patents when making the present application, but due to the limited space, all the details and contents are not listed in detail, but this is not a feature of the present application without these prior art, on the contrary, the present application has all the features of the prior art, and the applicant reserves the right to add relevant prior art in the background. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a construction method for an integrated auxiliary structure of a subway station, which is used for the construction of an integrated auxiliary structure and a main structure of an open-cut subway station in stages, and the original main structure enclosure pile at the longitudinal connection of the integrated auxiliary structure needs to be removed first, and then the auxiliary structure is constructed in longitudinal sections and transverse blocks. To meet the integrity, safety and reliability of the integrated auxiliary structure and the main structure in longitudinal connection construction.

[0006] To achieve the above object, the application provides a method for segmentally constructing a main body and an accessory structure of an underground station, comprising:

[0007] Excavating a foundation pit of the main body structure and constructing a main body enclosure structure;

[0008] Excavating a foundation pit of the accessory structure and constructing an accessory enclosure structure;

[0009] Continuously constructing a floor in a non-connection section of the foundation pit of the accessory structure of the station and skip-construction of a floor and a steel bar change support structure in a connection section;

[0010] Removing part of the shared main body enclosure structure in the main body structure foundation pit in the connection section and cutting off the shared bored pile to a design elevation;

[0011] Constructing a secondary floor post-pouring belt in a range of the pressed beam below the design cutting plane;

[0012] Removing the steel bar change support structure and performing waterproof treatment on the construction joint of the connection joint surface;

[0013] Pouring the secondary floor on the connection joint surface.

[0014] Preferably, the application further relates to a method for constructing a main body and an accessory structure of a subway station, comprising:

[0015] Constructing a main body enclosure structure in the main body structure foundation pit;

[0016] Constructing an accessory enclosure structure in the accessory structure foundation pit;

[0017] Constructing a floor in a non-connection section of the accessory structure foundation pit and the main body structure foundation pit;

[0018] Constructing a floor and a steel bar change support structure in a connection section of the accessory structure foundation pit and the main body structure foundation pit;

[0019] Removing part of the shared main body enclosure structure in the connection section and cutting off the bored pile to a design elevation;

[0020] Constructing a secondary floor post-pouring belt in a range of the pressed beam below the design cutting plane;

[0021] Removing the steel bar change support structure and performing waterproof treatment on the connection joint surface of the accessory structure foundation pit and the main body structure foundation pit;

[0022] Pouring the secondary floor on the connection joint surface.

[0023] Preferably, the application further relates to a method for integrally constructing an accessory structure of a subway open-cut station, comprising:

[0024] Excavating a foundation pit of the main body structure of the station and constructing a main body enclosure structure of the station;

[0025] Excavating the station auxiliary structure foundation pit connected with the station main structure foundation pit, and constructing the station auxiliary enclosure structure;

[0026] According to the longitudinal segmentation and transverse block way, the bottom plate and the steel bracing structure are continuously constructed in the non-connection section of the station auxiliary structure foundation pit, and the bottom plate and the steel bracing structure are constructed in the connection section by jumping;

[0027] Removing the part of the station main body enclosure structure shared with the station main structure foundation pit in the connection section;

[0028] Cutting off the cast-in-place pile structure shared by the connection part to the design elevation;

[0029] Excavating the area below the cutting surface at the design elevation, and constructing the top beam and the secondary bottom plate post-pouring belt;

[0030] Removing the steel bracing structure, and performing construction joint waterproof treatment on the connection joint surface of the steel bracing structure and the secondary bottom plate post-pouring belt;

[0031] Pouring the secondary bottom plate on the connection joint surface of the steel bracing structure and the secondary bottom plate post-pouring belt.

[0032] Preferably, the construction of the main enclosure structure in the present application can include the following steps:

[0033] Constructing the concrete support and the main enclosure structure crown beam on the top of the station main structure foundation pit;

[0034] Constructing the main enclosure bored pile on the side of the station main structure foundation pit; and

[0035] Constructing the main enclosure steel mesh anchor spraying surface on the side of the main enclosure bored pile facing the station main structure foundation pit;

[0036] Wherein,

[0037] The concrete support, the main enclosure structure crown beam, the main enclosure steel mesh anchor spraying surface and the main enclosure bored pile are connected to form the station main enclosure structure.

[0038] Preferably, the construction of the auxiliary enclosure structure in the present application can include the following steps:

[0039] Constructing the temporary steel support and the auxiliary enclosure structure crown beam on the top of the station auxiliary structure foundation pit;

[0040] Constructing the auxiliary enclosure bored pile on the side of the station auxiliary structure foundation pit; and

[0041] Constructing the auxiliary enclosure structure steel mesh anchor spraying surface on the side of the main enclosure bored pile facing the station auxiliary structure foundation pit;

[0042] Wherein,

[0043] The station auxiliary structure foundation pit shares part of the station main structure enclosure structure at the connection position with the station main structure foundation pit. In particular, in the present application, the auxiliary structure shares part of the support enclosure structure with the station main structure, and the shared part can not only serve as a vertical and horizontal support system during excavation of the auxiliary structure foundation pit, but also greatly simplifies the construction process.

[0044] Preferably, the present application can include the following steps for constructing the bottom plate in the non-connection section of the station auxiliary structure foundation pit and the bottom plate and the steel support structure in the connection section:

[0045] In the non-connection section, the bottom plate and side wall concrete pouring are sequentially and continuously performed in each section along the longitudinal direction according to the section order;

[0046] In the connection section, the bottom plate and side wall concrete pouring and the steel support structure are sequentially and separately performed in each section at least one section apart according to the section order. In the present application, the use of skip construction for bottom plate and side wall concrete pouring in the connection section and the use of steel support structure for temporary support replacement can increase the stability of the auxiliary structure, and the skip construction not only simplifies the construction progress, but also relieves and releases the stress of the slow-setting concrete structure, thereby reducing the construction cracks at the connection joint between the station main structure and the auxiliary structure, preventing station structure leakage, and improving structural stability.

[0047] Preferably, the removal of part of the shared station main enclosure structure in the connection section can include the following steps:

[0048] According to the section order, the temporary steel support, the main enclosure steel mesh anchor spraying surface, and the auxiliary enclosure structure steel mesh anchor spraying surface in each section are sequentially removed, and the corbel part is retained.

[0049] Preferably, the present application can include the following steps for cutting off the cast-in-place pile structure in the shared main enclosure structure to the design elevation:

[0050] The main side scaffolding and the auxiliary side scaffolding are respectively erected on the inner and outer sides of the station main structure, and the anchor spraying surface and the soil between the piles in the cutting range are cleaned;

[0051] A hoisting hole is arranged on the side of the cast-in-place pile using a drilling device, and a hoisting rope is connected to the hoisting hole for stabilizing the part of the pile to be cut off;

[0052] The predetermined length of the segmented pile body of the cast-in-place pile is cut off by using a rope saw in a combination of horizontal cutting and oblique cutting;

[0053] According to the length of the cut-off segmented pile body, the main side scaffolding and the auxiliary side scaffolding are gradually removed to a height equivalent to the remaining pile body to be cut off, and the cut-off segmented pile body is hoisted and transported out using a hoisting device;

[0054] Circulating the above steps until the remaining pile body is sequentially cut to the design elevation.

[0055] Preferably, the secondary bottom post-pouring belt in the present application can include the following steps:

[0056] Chiseling the pile head in the range of the pressure beam below the design elevation cutting surface;

[0057] Reserving longitudinal reinforcement in the range of the pressure beam for the construction of the pressure beam;

[0058] The pressure beam part as a secondary bottom post-pouring belt.

[0059] Preferably, the removal of the steel brace structure in the present application and the construction joint waterproof treatment of the connecting joint surface between the auxiliary structure foundation pit and the main structure foundation pit can include the following steps:

[0060] According to the order of the section, the steel brace structure in the connecting section is removed in sequence, and the soil in the post-pouring range is cleaned;

[0061] Coating the shared cast-in-place pile with a waterproof layer and a water stop strip on the cut surface;

[0062] A plurality of grouting pipes are arranged longitudinally in the middle of the side of the secondary bottom pouring surface facing the main structure foundation pit of the station, and at least one water stop strip is arranged on the upper and lower sides of the grouting pipe, respectively; and

[0063] A plurality of grouting pipes are arranged longitudinally at the bottom of the side of the secondary bottom pouring surface facing the auxiliary structure foundation pit of the station. In particular, due to the long connecting range between the auxiliary structure and the main structure of the station, the number and length of the construction joints are large, so special waterproof treatment is performed on the construction joints in the form of double water-swelling waterproof glue + grouting pipe, which can significantly reduce the risk of station leakage and water accumulation and improve the durability of the station structure.

[0064] Preferably, in the present application, the removal of the part of the station main enclosure structure shared with the main structure foundation pit of the station in any skip construction section in the connecting section is performed after the completion of the bottom plate and the steel brace structure of at least the next skip construction section. In particular, in the present application, when the shared main enclosure structure in the connecting section is removed, the skip section to be removed is allowed to experience a certain holding time before the corresponding removal process is performed, so that the corresponding skip section can fully release the concrete stress during the holding time to avoid sudden changes in concrete structure stress and unexpected soil disturbance during the removal process, thereby ensuring construction safety and structural stability.

[0065] Preferably, in the present application, the design elevation is a reference surface flush with the original bottom plate of the auxiliary structure foundation pit of the station. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is a plan view of the integrated connection of the main structure of the station and the auxiliary structure of the station according to a preferred embodiment of the present application;

[0067] Figure 2 is a sectional view of the integrated connection of the main structure of the station and the auxiliary structure of the station according to a preferred embodiment of the present application;

[0068] Figure 3 is a plan view of the installation of the horizontal support structure system of the main structure of the station and the auxiliary structure of the station according to a preferred embodiment of the present application;

[0069] Figure 4 is a sectional view of the segmented pouring of the bottom plate of the auxiliary structure of the station, the removal of the steel support replacement and the cutting of the pile according to a preferred embodiment of the present application;

[0070] Figure 5 is a plan view of the segmented pouring of the bottom plate of the auxiliary structure of the station, the removal of the steel support replacement and the cutting of the pile according to a preferred embodiment of the present application;

[0071] Figure 6 is a process flow chart of the segmented pouring of the bottom plate of the auxiliary structure of the station, the removal of the steel support replacement and the cutting of the pile according to a preferred embodiment of the present application;

[0072] Figure 7 is a sectional view of the replacement of the steel support of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0073] Figure 8 is a sectional view of the waterproofing construction at the connection position of the bottom plate of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0074] Figure 9 is a sectional view of the waterproofing construction at the construction joint of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0075] Figure 10 is a sectional view of the cutting of the enclosure pile of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0076] Figure 11 is a sectional view of the cutting of the enclosure pile of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0077] Figure 12 is a sectional view of the cutting of the enclosure pile of the auxiliary structure of the station according to a preferred embodiment of the present application;

[0078] Figure 13Fig. 4 is a schematic view of a cross section of a station auxiliary structure cutting pile construction according to a preferred embodiment of the present application;

[0079] Figure 14 Fig. 5 is a schematic view of a cross section of a station auxiliary structure cutting pile construction according to a preferred embodiment of the present application;

[0080] Figure 15 Fig. 6 is a schematic view of a cross section of a station auxiliary structure cutting pile construction according to a preferred embodiment of the present application.

[0081] List of reference signs

[0082] 1: Station main structure; 2: Main enclosure structure crown beam; 3: Main enclosure bored pile; 4: Main enclosure steel mesh anchor face; 5: Station auxiliary structure; 6: Auxiliary enclosure structure crown beam; 7: Auxiliary enclosure bored pile; 8: Main enclosure steel mesh anchor face; 9: Auxiliary enclosure steel mesh anchor face; 10: Concrete support; 11: Temporary steel support; 12: Bottom plate; 13: Steel bracing structure; 14: Water stop; 15: Grouting pipe; 16: Waterproof layer; 17: Auxiliary side scaffold; 18: Main side scaffold; 19: Secondary bottom plate post-pouring belt; a: Plain soil backfill; b: Cutting surface; c: Hoisting hole; d: Broken pile head; e: Water back surface. DETAILED DESCRIPTION

[0083] The present application will be described in detail below with reference to the accompanying drawings.

[0084] The present application provides a construction method based on the integration of a subway station auxiliary structure, which is particularly suitable for large stations such as a city subway two-line shared station hall or an intercity station connection. Due to the appropriate increase in the demand for the entry space, the subway station auxiliary structure needs to be designed integrally, and the longitudinal connection opening of the station auxiliary structure and the station hall main structure needs to be considered during construction.

[0085] Further, the present application relates to the sharing of the enclosure structure crown beam within the connection opening range of the integrated auxiliary structure and the main structure, the construction and removal of the concrete pile and the hanging net anchor; after the completion of the construction of the station main structure, the waterproof construction of the construction joint and the deformation joint within the connection opening range of the main structure during the secondary construction of the auxiliary structure; and the construction method of the complex procedures such as the auxiliary bottom plate structure reserved post-pouring belt, the bracing, and the secondary pouring of the skip.

[0086] Figure 1 and Figure 2 Fig. 1 shows the application scenario of the present application in some preferred embodiments, which specifically represents that the subway open-cut station main body has a large amount of integrated auxiliary structure engineering connected to the longitudinal two sides. Specifically, referring to Figure 1 and Figure 2The station structure is composed of a station main structure 1 and station auxiliary structures 5 distributed on both sides of the station main structure 1. Further, in the length or longitudinal direction of the station main structure 1, the station main structure 1 and the station auxiliary structures 5 are connected at a wide range of openings, about more than 60%, and the construction connection is a weak zone. If the construction measures are improper, the number of construction joints and deformation joints in the connection range will increase, thereby causing the risk of station leakage, and water leakage, station waterlogging, concrete corrosion, and steel reinforcement corrosion problems are likely to occur. In particular, referring to Figure 1 In the present application, the connection opening range can represent the part that can be connected transversely between the station main structure 1 and the station auxiliary structure 5.

[0087] The present application provides a subway open excavation station auxiliary structure integrated construction method, which can include:

[0088] Excavate the station main structure foundation pit and construct the station main structure enclosure.

[0089] Excavate the station auxiliary structure foundation pit and construct the station auxiliary structure enclosure.

[0090] According to the longitudinal segmentation and transverse block method, the bottom plate is continuously constructed in the non-connection section of the station auxiliary structure foundation pit, and the bottom plate and the steel support structure are constructed in the connection section.

[0091] Remove the part of the station main structure enclosure that is common with the station main structure foundation pit in the connection section.

[0092] Cut off the cast-in-place pile structure shared by the connection part to the design elevation.

[0093] Cut the area below the design elevation cutting surface and construct the pressure top beam and the secondary bottom plate post-poured band.

[0094] Remove the steel support structure and perform construction joint waterproof treatment on the connection joint surface of the steel support structure and the secondary bottom plate post-poured band.

[0095] Pour the secondary bottom plate on the connection joint surface of the steel support structure and the secondary bottom plate post-poured band.

[0096] Preferably, in the present application, the station main structure foundation pit and the station auxiliary structure foundation pit are at least partially connected, that is, at least partially transversely connectable.

[0097] Preferably, in the present application, the station main structure enclosure and the station auxiliary structure enclosure generally include crown beams, cast-in-place piles, concrete supports or steel supports, and net hanging and anchor supporting structures.

[0098] Preferably, in the present application, the longitudinal segmentation can mean that the station auxiliary structure is sequentially segmented into multiple sections along the longitudinal direction. The transverse segmentation can mean that the station auxiliary structure is sequentially constructed by being segmented into multiple blocks along the transverse direction of each section, which can include the construction of the base plate, temporary steel support structure, etc.

[0099] Preferably, in the present application, the skip-store base plate and steel support structure can mean that the base plate and steel support structure are constructed in each section with an interval of at least one section in the connection section.

[0100] According to a preferred embodiment, as shown in Figures 1 to 3 , the station main body enclosure can include a main body enclosure crown beam 2, a concrete support 10, a main body enclosure bored pile 3, and a main body enclosure steel mesh anchor shotcrete surface 4 (and 8). Specifically, as shown in Figure 3 , the concrete support 10 is arranged on the top surface of the station main body structure 1 foundation pit along the longitudinal gap of the station main body structure 1 foundation pit. As shown in Figure 1 and Figure 2 , a plurality of main body enclosure bored piles 3 are inserted into the foundation pit along the depth direction of the station main body structure foundation pit and are arranged circumferentially around the station main body structure foundation pit.

[0101] Further, the main body enclosure steel mesh anchor shotcrete surface 4 (and 8) is arranged on the inside of the station main body structure 1 and / or the side of the main body enclosure bored pile 3 facing the station main body structure 1. In particular, the main body enclosure crown beam 2 is arranged on the top surface of the station main body structure 1 foundation pit and is connected with the concrete support 10, the main body enclosure steel mesh anchor shotcrete surface 4 (and 8), and the plurality of main body enclosure bored piles 3 to form a main body support structure system. In the present application, the main body enclosure bored pile 3 can be arranged at the connection part of the station main body structure 1 and the station auxiliary structure 5 and can serve as a shared support structure of the station auxiliary structure 5.

[0102] According to a preferred embodiment, after the station main body structure 1 foundation pit is excavated and the station main body enclosure is constructed, the main body structure bottom plate is further constructed at the bottom of the station main body structure 1 foundation pit.

[0103] According to a preferred embodiment, as shown in Figures 1 to 3 , the station auxiliary enclosure can include an auxiliary enclosure crown beam 6, an auxiliary enclosure bored pile 7, a temporary steel support 11, and an auxiliary enclosure steel mesh anchor shotcrete surface 9. Specifically, as shown in Figure 3 , the temporary steel support 11 is arranged on the top surface of the station auxiliary structure 5 foundation pit along the longitudinal gap of the station auxiliary structure 5 foundation pit. A plurality of auxiliary enclosure bored piles 7 can be inserted into the station auxiliary structure 5 foundation pit along the depth direction of the station auxiliary structure 5 and arranged circumferentially around the station auxiliary structure 5.

[0104] Further, as shown in Figure 1As shown, the station auxiliary structure 5 inside and / or the side of the auxiliary enclosure bored pile 7 towards the station auxiliary structure 5 is provided with an auxiliary enclosure steel mesh anchor shotcrete surface 9. In particular, the auxiliary enclosure structure crown beam 6 can be arranged on the top surface of the station auxiliary structure 5 foundation pit, and connected with the temporary steel support 11, the auxiliary enclosure steel mesh anchor shotcrete surface 9 and the auxiliary enclosure bored pile 7 to jointly form an auxiliary support structure system.

[0105] According to a preferred embodiment, Figure 3 As shown, the station auxiliary structure 5 foundation pit horizontal temporary support is installed and erected by using the original station main structure 1 crown beam and enclosure pile. Specifically, in the present application, the station auxiliary enclosure structure can utilize the original main enclosure structure system within the lateral connection range of the station main structure 1. Specifically, as shown in Figures 2 to 4 As shown, when the station auxiliary enclosure structure is constructed, only the enclosure structure of the remaining three sides of the station auxiliary structure foundation pit can be constructed, and the main enclosure structure crown beam 2 and the main enclosure bored pile 3 of the original station main enclosure structure are respectively connected with the auxiliary enclosure structure crown beam 6 and the auxiliary enclosure bored pile 7 newly constructed on the other three sides to form a closed ring of enclosure structure. And as a vertical and horizontal support system during the excavation of the station auxiliary structure 5 foundation pit.

[0106] According to a preferred embodiment, after the open excavation of the station auxiliary structure 5 foundation pit and the construction of the station auxiliary enclosure structure, the auxiliary structure bottom plate 12 and / or the steel shape replacement structure 13 are constructed at the bottom of the station auxiliary structure 5 foundation pit, as shown in Figure 4 .

[0107] According to a preferred embodiment, Figures 4 to 6 As shown, after the station auxiliary structure 5 foundation pit is excavated to the bottom, the auxiliary main structure is implemented, and the position relationship and jump construction procedure of the bottom plate segmentation, block division, temporary support removal and replacement of steel inverted support, and cutting of the original main enclosure pile within the longitudinal connection opening range of the existing station main structure 1 project are shown.

[0108] In particular, jump construction refers to the division of a super-long concrete block into several small blocks for interval construction in the early stage of high temperature shrinkage stress, and the connection of several small blocks into a whole in the later stage of small shrinkage stress, relying on the tensile strength of concrete to resist the temperature shrinkage stress in the next stage. In the present application, the use of jump construction not only simplifies the construction progress, but also significantly reduces the construction cracks at the connection surface of the station main structure 1 and the station auxiliary structure 5, prevents leakage of the station structure and increases its stability.

[0109] According to a preferred embodiment, as shown in Figure 5 and Figure 6The station auxiliary structure 5 is divided into several sections along its longitudinal direction, including non-connection sections outside the connection range of the station main structure foundation pit and the station auxiliary structure foundation pit and connection sections within the connection range of the station main structure foundation pit and the station auxiliary structure foundation pit. Specifically, as shown in Figure 5 and Figure 6 , the sections outside the connection range of the station main structure foundation pit and the station auxiliary structure foundation pit are continuously formed with the floor; the sections within the connection range of the station main structure foundation pit and the station auxiliary structure foundation pit are formed with the floor and the steel brace replacement structure at intervals.

[0110] For ease of understanding, the position relationship and the construction procedure of the floor sectioning, the block division, the temporary support removal and the replacement of the steel brace, and the cutting of the original main enclosure pile and the jump bay construction process are described in detail below. Figure 5 and Figure 6 .

[0111] Specifically, as shown in Figure 5 , it is assumed that the station auxiliary structure 5 is divided into 10 sections along the longitudinal direction, i.e., the 1st section to the 10th section. Specifically, the 3rd section to the 7th section are included in the transverse connection range of the station main structure 1 and the station auxiliary structure 5; the 1st section, the 2nd section and the 8th section to the 10th section are included in the transverse non-connection range of the station main structure 1 and the station auxiliary structure 5.

[0112] According to a preferred embodiment, as shown in Figure 5 and Figure 6 , the floor 12 and the side wall concrete pouring are sequentially formed along the longitudinal direction of the station auxiliary structure 5 from the 1st section to the 2nd section. In particular, when the construction is performed in the transverse connection range, the jump bay construction is adopted, i.e., as shown in Figure 5 and Figure 6 , the floor 12 is formed at intervals in the order of the 3rd section, the 5th section and the 7th section, and the steel brace replacement structure 13 is formed in the order of the 3rd' section, the 5th' section and the 7th' section.

[0113] Thereafter, in the transverse non-connection range, the floor 12 and the side wall concrete pouring are continuously formed, i.e., as shown in Figure 5 , the 8th section to the 10th section are continuously constructed. On the other hand, after the floor 12 of the 3rd section, the 5th section and the 7th section and the steel brace replacement structure 13 of the 3rd' section, the 5th' section and the 7th' section in the transverse connection range are formed, the jump bay construction of the remaining sections is completed, i.e., as shown in Figure 5 , the floor 12 is formed in the order of the 4th section and the 6th section, and the steel brace replacement structure 13 is formed in the order of the 4th' section and the 6th' section. During the jump bay construction, a certain holding time is usually required between the construction of each bay section and the construction of the next section to sufficiently release the stress of the concrete through the holding time. In particular, the holding time is generally several days to about ten days.

[0114] In particular, when the station auxiliary structure 5 foundation pit is excavated to the bottom and the auxiliary structure bottom plate 12 is constructed, the structure bottom plate is segmented in the longitudinal direction according to the designed length, and is constructed in two stages in the transverse width direction (i.e., the bottom plate 12 + the structure 13 made of steel), and the size of the blocks is determined according to the operation space required by the subsequent construction process of the original main body enclosure pile at the connection hole part of the auxiliary structure and the main body structure.

[0115] In an optional embodiment, the first bottom plate 12 is poured in the width direction to about 3 / 4 of the part away from the connection enclosure pile (i.e., the main body enclosure bored pile 3) of the main body structure 1 of the station, and the pouring of the second bottom plate 12 is performed after the original enclosure pile (i.e., the main body enclosure bored pile 3) at the connection part of the main body structure 1 of the station is removed, that is, the bottom plate 12 is poured in the remaining about 1 / 4 part of the slab beam connection in the main body structure 1 of the station. Specifically, as shown in Figure 7 After the first bottom plate 12 is poured to about 3 / 4 of the part away from the connection enclosure pile (i.e., the main body enclosure bored pile 3), in order to reasonably and safely transfer the stress of the support system of the enclosure structure, the soil backfill a at the bottom of the foundation pit and the steel support structure 13 are installed between the newly constructed second auxiliary structure bottom plate 12 and the original connection enclosure pile (i.e., the main body enclosure bored pile 3) for support replacement.

[0116] In an optional embodiment, the steel support structure 13 can be reliably welded with the I-beam. Specifically, the I-beam is a 145C I-beam with a diameter of φ25@300. Further, the welding interval of the I-beam along the longitudinal direction of the station auxiliary structure 5 is, for example, 1500mm.

[0117] Further, after the bottom plate 12, the concrete pouring of the side wall, and the construction of the steel support structure 13 in the connection section of the station auxiliary structure 5 are completed, the temporary support system in each connection section is sequentially removed according to the skip construction sequence, and the inner and outer steel mesh anchor spraying surfaces of the original enclosure pile at the connection part are removed, and the original enclosure pile is segmented and cut to the designed elevation. Thereafter, the waterproof penetration treatment is performed on the cut pile top and the remaining construction joints at the connection part, and the concrete is poured for the second time. In particular, when the inner and outer steel mesh anchor spraying surfaces of the original enclosure pile at the connection part are removed, only the steel mesh anchor spraying support of the common part of the main foundation pit and the auxiliary foundation pit is removed, that is, as shown in Figure 4 The main body enclosure steel mesh anchor spraying surface 8.

[0118] Specifically, referring to Figure 5 and Figure 6 , first, the temporary support system of the 3' section (specifically, the temporary steel support 11 as shown in Figure 3 and Figure 4 ) is removed. Further, after the temporary support system of the 3' section is removed, the inner and outer steel mesh anchor spraying surfaces of the original enclosure pile at the connection part are removed, and the original enclosure pile is segmented and cut to the designed elevation. Thereafter, the waterproof penetration treatment is performed on the cut pile top and the remaining construction joints at the connection part, and the concrete is poured for the second time. In particular, when the inner and outer steel mesh anchor spraying surfaces of the original enclosure pile at the connection part are removed, only the steel mesh anchor spraying support of the common part of the main foundation pit and the auxiliary foundation pit is removed, that is, as shown in Figure 6As shown, this also includes the removal of the original inner and outer steel mesh anchor spraying surface of the retaining piles at the connection point of section a (section 3') (specifically as shown in the figure). Figure 1 The main retaining steel mesh anchor sprayed surface 4 or 8 and the auxiliary structure steel mesh anchor sprayed surface 9 are shown, and the original retaining piles (specifically as shown) are also included. Figure 1 The main retaining borehole pile 3) shown is cut off in sections to the design elevation. After that, the top of the cut pile and the remaining construction joints at the bottom plate connection of section 3' are treated for seepage prevention, and the part between the connection position and the original bottom plate 12 (including the part where the steel replacement support structure 13 is located) is poured with secondary bottom plate 12.

[0119] Further, in sequence Figure 5 The construction sequence for sections 3' (section a), 5' (section c), and 7' (section e) shown is as follows: temporary support system, removal of the existing retaining pile's inner and outer steel mesh and shotcrete surface, cutting of the existing retaining pile to the design elevation, waterproofing and leakage treatment of joints and expansion joints at the connection surfaces, and finally, secondary pouring of the base slab concrete. Specifically, in this invention, the design elevation can be as follows: Figure 13 The reference plane shown is flush with the base plate 12 within the station's ancillary structure 5.

[0120] In some alternative implementations, within the connection range, the demolition of the supporting and retaining structures (temporary support system, reinforced mesh and shotcrete surface) and retaining piles in any warehouse adjustment construction section can be carried out after the completion of the construction of the base slab 12 and the steel replacement support structure 13 in the subsequent warehouse adjustment construction section. Alternatively, the demolition of the supporting and retaining structures (temporary support system, reinforced mesh and shotcrete surface) and retaining piles in any warehouse adjustment construction section can be carried out after the completion of the construction of the base slab 12 and the steel replacement support structure 13 in the subsequent two warehouse adjustment construction sections. In other words, the demolition of the supporting and retaining structures (temporary support system, reinforced mesh and shotcrete surface) and retaining piles in any warehouse adjustment construction section should be carried out after the completion of the construction of the base slab 12 and the steel replacement support structure 13 in at least the subsequent warehouse adjustment construction section.

[0121] In some alternative implementations, after the base slab 12 and steel replacement support structure 13 of all sections within the shifting construction section or connecting section have been constructed, the supporting retaining structure (temporary support system, steel mesh anchor spraying surface) and retaining piles are demolished according to the original shifting construction sequence. Specifically, Figure 6 Only one possible construction sequence is shown, namely, after the base plate 12 and steel support structure 13 of sections 3' (section a) and 5' (section c) are completed, the retaining structure demolition process is then carried out from section 3' (section a) in a staggered construction sequence. Specifically, in Figure 6In the illustrated state, when the third section (a section) is broken, the third section (a section) will experience a preset holding time so that the stress of the concrete is fully relieved and released. On the other hand, in other scenarios, the breaking nodes and / or sequence of the support enclosure and the enclosure pile can be determined according to the specific engineering requirements, and are not limited to Figure 6 The construction sequence shown.

[0122] According to a preferred embodiment, in the present application, when the temporary support system in each section of the connection range is removed, the original reinforcement mesh anchoring and spraying surface in the original enclosure pile at the connection position is removed, and the original enclosure pile is segmented and cut off to the design elevation, the upper crown beam structure needs to be retained, that is, as Figure 2 The main enclosure crown beam 2 and / or the auxiliary enclosure crown beam 6 shown.

[0123] According to a preferred embodiment, Figure 8 The structure is shown when waterproof construction is carried out at the station auxiliary structure 5 bottom plate connection pouring position after the temporary support system is removed and the original enclosure pile structure is broken to the design elevation.

[0124] Specifically, after the original enclosure pile structure, that is, the main body enclosure bored pile 3 shared by the connection position is cut off to the design elevation, and the pile top of the cutting pile in the range of the bottom plate compression beam is chiseled off, the I-beam is removed, and the soil in the post-pouring range is cleaned. After that, the surface of the main body enclosure bored pile 3 is washed clean with clean water, the main body enclosure bored pile 3 is cut flush on both sides, and a 50x50 sealant is used for sealing. In an optional embodiment, a side wall waterproof layer and a waterproof reinforcing layer can be provided between the remaining main body enclosure bored pile 3 and the station main structure 1.

[0125] Further, the surface of the main body enclosure bored pile 3 is coated with a waterproof layer 16. In an optional embodiment, the waterproof layer 16 can be a cement-based penetrating crystalline coating. In particular, the density of the cement-based penetrating crystalline coating is about 2 kg / m 2 After that, the water stop strip 14 is attached to the root of each anchor bar of the main body enclosure bored pile 3. Specifically, as Figure 8 shown, the water stop strip 14 can be attached to the junction between the root of each anchor bar of the main body enclosure bored pile 3 and the waterproof layer 16. In particular, a concrete cushion layer is provided between the waterproof layer 16 and the bottom of the station auxiliary structure 5.

[0126] According to a preferred embodiment, after the main body enclosure bored pile 3 is broken to the desired position and the waterproof layer 16 and the water stop strip 14 are applied to its surface, the bottom plate 12 can be formed by secondary pouring of concrete at the connection position above the waterproof layer 16 in the later stage.

[0127] In particular, since the connection between the station auxiliary structure 5 and the station main structure 1 cannot be pre-embedded with a waterstop during the construction of the station main structure 1, but the number and length of construction joints in the connection range between the station auxiliary structure 5 and the station main structure 1 are large, waterproofing treatment must be carried out in accordance with the special construction joint waterproofing method, using the form of double-layer water-swellable sealant + grouting pipe.

[0128] Specifically, such as Figure 8 As shown, multiple grouting pipes 15 are longitudinally spaced along the middle of the side of the base plate 12 facing the main station structure 1. Specifically, the spacing between the grouting pipes 15 is, for example, 2m-4m, 3m-5m, or 5m-6m. The specific spacing between the grouting pipes 15 can be determined according to the on-site construction scenario. Furthermore, at least one waterstop strip 14 is spaced apart on both the upper and lower sides of each grouting pipe 15. In particular, the distance between the waterstop strip 14 and the grouting pipe 15 is, for example, 100mm. On the other hand, as... Figure 8 As shown, multiple grouting pipes 15 are installed at the bottom of the base plate 12 on the side facing the station auxiliary structure 5. The specific spacing can be found in the previous text.

[0129] According to a preferred embodiment, Figure 9 A cross-sectional schematic diagram of the waterproofing construction of the construction joint in station ancillary structure 5 is shown. Specifically, in conjunction with... Figure 8 and Figure 9 At least one grouting pipe 15 is inserted into the base plate 12 from the backwater surface e and extends to the construction joint. At least one waterstop strip 14 is provided on each of the left and right sides of the grouting pipe 15 in a manner that fits against the construction joint. In particular, the distance between the waterstop strip 14 and the grouting pipe 15 is, for example, 100 mm.

[0130] Figures 10 to 14 This demonstrates that, to minimize the impact on the existing main structure, the retaining piles (main retaining drilled piles 3) were removed using static segmented cutting with a diamond wire saw, and water-cooled drilling was used to drill the lifting holes (c). Considering factors such as construction safety and site conditions, the piles were vertically demolished in segments, employing both oblique and horizontal cutting methods. The construction sequence is as follows:

[0131] Procedure 1: Erect scaffolding on both the inner and outer sides of the main structure 1 of the station, according to the on-site construction sequence. For details, see... Figure 10 On the side of the main retaining piles, namely the main retaining drilled piles 3, a main side scaffold 18 is erected on one side of the main retaining steel mesh anchor sprayed surface 4, and an auxiliary side scaffold 17 is erected on the side of the auxiliary retaining steel mesh anchor sprayed surface 9. After the scaffolds on both sides are erected, the sprayed and anchored surfaces (main retaining steel mesh anchor sprayed surface 4 and auxiliary retaining steel mesh anchor sprayed surface 9) and the soil between the piles within the entire cutting range are broken up section by section. After the debris is cleared, the inner and outer scaffolds of the main station structure 1 (i.e., auxiliary side scaffold 17 and main side scaffold 18) can be dismantled.

[0132] Step two: After the soil between the piles and the anchor surface on both sides is cleaned, a scaffold is erected on the side of the foundation pit of the auxiliary station structure 5, and after the erection is completed, the first section of the pre-determined length of the segmented pile body is cut off, and it is hoisted out by using a crane. Specifically, as shown in Figure 11 , when cutting off the first section of the segmented pile body, a hoisting hole c is first laid out at an appropriate position by using a water drill, a steel wire rope is passed through, and a hoist is used for stabilization, and then a rope saw is used for horizontal and oblique cutting of the upper and lower cutting surfaces b, respectively, wherein the oblique cutting is beneficial for the hoisting and removal of the segmented pile body. In particular, the length of the first section of the segmented pile body is about 500 mm. Preferably, the water drill punching position may be, for example, on both sides of the pile body.

[0133] Step three: Referring to Figure 12 , after the cutting of the first section of the pile body is completed, the auxiliary side scaffold 17 on one side of the auxiliary structure is gradually removed from top to bottom according to the cutting height of the segmented pile body, so that the first section of the pile body is hoisted out. Then, the steps of "laying out hoisting holes at appropriate positions in the cutting sections divided from top to bottom in the range of the broken pile body, laying out hoisting holes c, passing through a steel wire rope, using a hoist for stabilization, and then using a rope saw for horizontal and oblique cutting of the upper and lower cutting surfaces b" are repeated until the remaining pile bodies are sequentially cut off section by section to the design elevation.

[0134] Step four: Referring to Figure 13 , before cutting the last section of the segmented pile body, the auxiliary side scaffold 17 on one side of the auxiliary structure is removed to the corresponding design elevation, a hoisting hole c is punched on the surface of the pile body by using a water drill, the pile body is hoisted and stabilized by using a crane passing through a steel wire rope, and then horizontal cutting and hoisting removal are performed by using a rope saw at the interface between the pile body and the slab of the main station structure 1, thereby completing the entire rope saw cutting work of one pile body.

[0135] Step five: As shown in Figure 14 , after the last section of the segmented pile body is cut to reach the design elevation, the scaffolds on both sides are removed. In particular, the design elevation is a reference surface flush with the bottom plate 12 in the station auxiliary structure 5 as shown in Figure 13 . Further, after the common enclosing pile (i.e., the main enclosing bored pile 3) is cut to the design elevation, the pile head in the range of the top beam below the horizontal cutting line is manually chiseled (i.e., broken pile head d), and the top beam is constructed.

[0136] Further, as shown in Figure 15As shown, the pile head in the range of the horizontal cutting line below the capping beam is manually chiseled (i.e. broken pile head d), and the capping beam is applied, and the secondary floor post-pouring belt 19 is reserved at the capping beam. In particular, by applying the secondary floor post-pouring belt 19, subsequent pouring of the floor at the secondary floor post-pouring belt 19 can be performed to connect the hole range of the lateral connection of the station main structure 1 and the station auxiliary structure 5 to form a whole, and the connection position of the two is kept flat. Specifically, for example, the secondary floor pouring can be performed by using the grouting pipe 15 as shown. Figure 8 and Figure 9 As shown.

[0137] According to a preferred embodiment, as shown Figure 12 In step three, when the first section of the pile body is cut and the auxiliary side scaffold 17 on the auxiliary structure side is gradually removed from top to bottom according to the cutting height of the sectioned pile body, the main body side scaffold 18 on the main structure side should also be removed synchronously from top to bottom according to the cutting height of the sectioned pile body to the same level as the auxiliary side scaffold 17, in order to ensure the smooth development of the removal and hoisting of the sectioned pile body.

[0138] In some optional embodiments, the angle of the oblique cutting is, for example, 20°, 30°, 45°, or other possible cutting angles. Further, the length of each section of the sectioned pile body is, for example, about 1.0m-1.5m. It should be noted that the angle of the oblique cutting and the length of the sectioned pile body are only for example, and according to different specific construction scenes, the cutting angle and the length of the sectioned pile body should be determined according to the length / depth of the foundation pit, hoisting process, and on-site construction safety and many other factors.

[0139] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and do not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment", or "optionally", which all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept.

Claims

1. A method of segmental construction of a main body and appurtenant structures of an underground station, characterized in that, Comprising: Excavating the main structure foundation pit, and constructing the main enclosure structure; Excavating the auxiliary structure foundation pit, and constructing the auxiliary enclosure structure; Continuously constructing the bottom plate in the non-connection section of the station auxiliary structure foundation pit and skip-constructing the bottom plate and the steel bracing structure in the connection section, including continuously constructing the bottom plate and the side wall concrete casting in each section in sequence along the longitudinal direction in the non-connection section, and horizontally constructing the bottom plate and the side wall concrete casting and the steel bracing structure in each section in sequence at intervals of at least one section in the connection section according to the section sequence; Removing the shared main enclosure structure in the main structure foundation pit in the connection section, including sequentially removing the temporary steel support (11), the main enclosure steel mesh shot anchor surface (8), and the auxiliary enclosure structure steel mesh shot anchor surface (9) in each section according to the section sequence, and cutting off the shared cast-in-place pile to the design elevation, including erecting the main side scaffolding (18) and the auxiliary side scaffolding (17) on the inner and outer sides of the station main structure (1) respectively, and cleaning the shot anchor surface and the soil between the piles in the cutting range, arranging the hoisting hole (c) on the side surface of the cast-in-place pile by using a drilling device, and connecting the hoisting hole (c) by a hoisting rope for stabilizing the part of the pile to be cut off, cutting off the segmented pile body of the predetermined length of the cast-in-place pile by using a rope saw in a combined manner of horizontal cutting and oblique cutting, gradually removing the main side scaffolding (18) and the auxiliary side scaffolding (17) to the height corresponding to the remaining pile body to be cut off according to the length of the cut-off segmented pile body, and hoisting the cut-off segmented pile body out of the pit by using a hoisting device, and repeating the above steps until the remaining pile bodies are sequentially cut off to the design elevation; Constructing the secondary bottom plate post-pouring belt in the range of the pressed beam below the cutting surface at the design elevation; Removing the steel bracing structure, and performing waterproof treatment on the construction joint of the connection joint surface; Pouring the secondary bottom plate on the connection joint surface.

2. A method of constructing a subway station structure with a main body first and an accessory later, characterized by, Comprising: Constructing the main enclosure structure in the main structure foundation pit; Constructing the auxiliary enclosure structure in the auxiliary structure foundation pit; Constructing the bottom plate in the non-connection section of the auxiliary structure foundation pit and the main structure foundation pit; Interval-constructing the bottom plate and the steel bracing structure in the connection section of the auxiliary structure foundation pit and the main structure foundation pit, including continuously constructing the bottom plate and the side wall concrete casting in each section in sequence along the longitudinal direction in the non-connection section, and horizontally constructing the bottom plate and the side wall concrete casting and the steel bracing structure in each section in sequence at intervals of at least one section in the connection section according to the section sequence; Removing the shared main enclosure structure in the connection section, including sequentially removing the temporary steel support (11), the main enclosure steel mesh shot anchor surface (8), and the auxiliary enclosure structure steel mesh shot anchor surface (9) in each section according to the section sequence, and cutting off the segmental pile body of the predetermined length of the bored pile by means of the rope saw in a combined manner of horizontal cutting and oblique cutting, removing the main side scaffold (18) and the auxiliary side scaffold (17) gradually to the height corresponding to the remaining pile body to be cut off according to the length of the segmental pile body that has been cut off, and hoisting the segmental pile body that has been cut off out of the station by means of the hoisting equipment, and repeating the above steps until the remaining pile bodies are cut off in sequence to the design elevation; applying secondary bottom post-cast strip to the range of the pressed roof beam below the design elevation cutting surface; removing the steel bracing structure, and performing construction joint waterproof treatment on the connecting joint surface between the auxiliary structure foundation pit and the main structure foundation pit; applying secondary bottom post-cast strip to the connecting joint surface.

3. A method for integrated construction of a subway open-cut station auxiliary structure, characterized in that, It comprises: excavating the main structure foundation pit of the open-cut station, and applying the main enclosure structure of the station; excavating the auxiliary structure foundation pit of the station connected with the main structure foundation pit of the station, and applying the auxiliary enclosure structure of the station; applying the bottom plate and the steel bracing structure to the non-connecting section of the auxiliary structure foundation pit of the station in a longitudinal sectioning and lateral blocking manner, which comprises continuously applying the bottom plate and the side wall concrete pouring to each section in sequence along the longitudinal direction in the non-connecting section, and applying the bottom plate and the side wall concrete pouring and the steel bracing structure to each section in sequence with an interval of at least one section in the connecting section; removing the part of the main enclosure structure of the station shared with the main structure foundation pit in the connecting section, which comprises removing the temporary steel support (11), the main enclosure steel mesh shotcrete surface (8) and the auxiliary enclosure structure steel mesh shotcrete surface (9) in each section in sequence; cutting off the bored pile structure shared by the connecting part to the design elevation, which comprises setting up the main side scaffold (18) and the auxiliary side scaffold (17) on the inner and outer sides of the main structure of the station (1) respectively, cleaning the shotcrete surface and the soil between piles in the cutting range, arranging the hoisting hole (c) on the side of the bored pile by means of the drilling equipment, and connecting the hoisting hole (c) by means of the hoisting rope for stabilizing the part of the pile body to be cut off, cutting off the segmental pile body of the predetermined length of the bored pile by means of the rope saw in a combined manner of horizontal cutting and oblique cutting, removing the main side scaffold (18) and the auxiliary side scaffold (17) gradually to the height corresponding to the remaining pile body to be cut off according to the length of the segmental pile body that has been cut off, and hoisting the segmental pile body that has been cut off out of the station by means of the hoisting equipment, and repeating the above steps until the remaining pile bodies are cut off in sequence to the design elevation; applying the pressed roof beam to the removed area below the design elevation cutting surface, and applying secondary bottom post-cast strip; removing the steel bracing structure, and performing construction joint waterproof treatment on the connecting joint surface between the steel bracing structure and the secondary bottom post-cast strip; Secondary floor pouring is performed on the connection joint surface of the steel frame support structure and the secondary floor post-cast strip.

4. The construction method according to any one of claims 1 to 3, characterized in that, The main body enclosure structure comprises: A concrete support (10) and a main body enclosure crown beam (2) are constructed on the top of the station main body structure foundation pit; A main body enclosure bored pile (3) is constructed on the side of the station main body structure foundation pit; and A main body enclosure steel mesh shot anchor surface (4; 8) is constructed on the side of the main body enclosure bored pile (3) facing the station main body structure foundation pit; Wherein, The concrete support (10), the main body enclosure crown beam (2), the main body enclosure steel mesh shot anchor surface (4; 8), and the main body enclosure bored pile (3) are connected to form the main body enclosure structure.

5. The construction method according to claim 4, characterized in that, The station auxiliary enclosure structure comprises: A temporary steel support (11) and an auxiliary enclosure crown beam (6) are constructed on the top of the station auxiliary structure foundation pit; An auxiliary enclosure bored pile (7) is constructed on the side of the station auxiliary structure foundation pit; and An auxiliary enclosure steel mesh shot anchor surface (9) is constructed on the side of the main body enclosure bored pile (3) facing the station auxiliary structure foundation pit; Wherein, The station auxiliary structure foundation pit shares part of the station main body enclosure structure at the connection position with the station main body structure foundation pit.

6. The construction method according to any one of claims 1 to 3, characterized in that, The secondary floor post-cast strip below the design elevation cutting surface comprises: The pile head in the range of the compression top beam below the design elevation cutting surface is chiseled; Longitudinal reinforcement is reserved in the range of the compression top beam for construction of the compression top beam; The compression top beam part is used as a secondary floor post-cast strip.

7. The construction method according to any one of claims 1 to 3, characterized in that, The removal of the steel frame support structure and the waterproof treatment of the construction joint of the connection joint surface of the auxiliary structure foundation pit and the main body structure foundation pit comprise: The steel frame support structure in the connection section is removed in sequence according to the section order, and the soil in the post-cast range is cleaned; A waterproof layer (16) and a water stop strip (14) are applied to the cut surface of the shared bored pile; Multiple grouting pipes (15) are arranged longitudinally in the middle of the side of the secondary floor pouring surface facing the station main body structure foundation pit, and at least one water stop strip (14) is arranged on the upper and lower sides of the grouting pipe (15); and Multiple grouting pipes (15) are arranged longitudinally in the bottom of the side of the secondary floor pouring surface facing the station auxiliary structure foundation pit.

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