CN115821985A

CN115821985A - Integrated construction method for auxiliary structure of subway open cut station

Info

Publication number: CN115821985A
Application number: CN202211679180.1A
Authority: CN
Inventors: 王文兵; 黄雪梅; 纪艳琪; 马亚仲; 方治; 王玥; 孙宾
Original assignee: Beijing Uni Construction Group Co Ltd
Current assignee: Beijing Uni Construction Group Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-03-21

Abstract

The invention relates to an integrated construction method of an auxiliary structure of a subway open cut station, which is used for large stations such as a station hall shared by two lines of urban subways or a station connected with an intercity station, and the like, and the requirement on the station entering space is properly increased, so that the integrated design of the auxiliary structure of the subway station is realized, and the longitudinal connection and the hole opening of the auxiliary structure of the station and the main structure of the station hall layer need to be considered during construction, so that the integrated auxiliary structure and the main structure are connected and the hole opening range are shared by a crown beam of an enclosure structure, and a concrete cast-in-place pile and a net hanging spray anchor are applied and removed; after the construction of the main structure of the station is finished, when the auxiliary structure is constructed for the second time, the main structure is connected with the construction joint and the deformation joint in the range of opening the hole; and in the range of the connection and the opening, the auxiliary bottom plate structure is reserved with a post-pouring belt, and the construction method comprises the complex procedures of support replacement, secondary pouring of a skip bin and the like. The integrated construction method of the auxiliary structure of the station, provided by the invention, can well solve the construction problem of large-space access connection of the auxiliary structure of the subway station.

Description

Integrated construction method for auxiliary structure of subway open cut station

Technical Field

The invention relates to the technical field of underground traffic engineering, in particular to an integrated construction method for an auxiliary structure of a subway open cut station, and specifically relates to a construction method for blocking a connecting part of the auxiliary structure and a main structure by an enclosure structure when the auxiliary structure and the main structure of the station are constructed in stages.

Background

With the continuous increase of the passenger flow volume in the peak period of a large city, in the open cut station projects of some subways in the city, in large stations such as two-line shared station halls or large stations connected with intercity stations, in order to optimize transfer flow lines, improve the utilization efficiency of station public areas, promote the integration of stations and cities, and gradually develop stations and auxiliary structures towards an integrated development space direction.

Particularly, the integrated construction of the station and the auxiliary structure is influenced by the factors of temporary land limitation of urban subway construction, complex simultaneous construction stress system of the auxiliary structure and the main structure of the station, too many crossed construction processes, numerous construction safety hazards and the like. When the auxiliary structure is constructed, the original main body enclosure structure in the connection range needs to be broken, then the structure construction is carried out in a longitudinal segmentation mode, and the main body enclosure structure is connected into a whole with the main body structure, wherein the connection range is the weak part of a station, if the construction process is improper, the integrity of the station is affected, and the service life of the station is shortened. In addition, most stations are built in underground space, so that the number of construction joints and deformation joints in a connection range is increased, the risk of station leakage is improved, water leakage easily occurs, the problems of station water accumulation, concrete corrosion, reinforcement cage corrosion and the like are caused, and the durability, safety and reliability of a station structure are seriously influenced. In view of this, a construction method based on an integrated auxiliary structure of a subway station is urgently needed to solve the problem of the connection and disconnection of the large space for the access of the auxiliary structure of the subway station.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the applicant has studied a great deal of literature and patents when making the present invention, but the disclosure is not limited thereto and the details and contents thereof are not listed in detail, it is by no means the present invention has these prior art features, but the present invention has all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a construction method of an integrated auxiliary structure of a subway station, which is used for breaking the integrated auxiliary structure and the fender post of the original main structure at the longitudinal connection part in advance when the auxiliary structure and the main structure of the open cut subway station are constructed in stages, and then carrying out longitudinal segmentation and transverse segmentation construction on the auxiliary structure. The integrity, the safety and the reliability of the integrated auxiliary structure and the main structure in large space during longitudinal connection construction are met.

In order to achieve the above object, the present invention provides a method for constructing a main body and an auxiliary structure of an underground station in sections, comprising:

excavating a foundation pit of the main body structure, and constructing a main body enclosure structure;

excavating a foundation pit of the auxiliary structure, and constructing an auxiliary enclosure structure;

continuously constructing a bottom plate in a non-connection section of a foundation pit of the station auxiliary structure and constructing a bottom plate and a section steel support changing structure in a bay jumping mode in a connection section;

removing part of the main structure foundation pit in the connection section to share a main enclosure structure, and cutting off a shared cast-in-place pile to a designed elevation;

applying a secondary bottom plate post-cast strip in the range of the capping beam below the designed elevation cutting surface;

dismantling the profile steel support replacing structure, and performing construction joint waterproof treatment on the joint surface;

and performing secondary bottom plate pouring on the connection joint surface.

Preferably, the invention also relates to a construction method of the subway station structure with the main body and the auxiliary body, which comprises the following steps:

constructing a main body enclosure structure in the main body structure foundation pit;

constructing an auxiliary enclosure structure in the auxiliary structure foundation pit;

constructing a bottom plate at the non-connection section of the auxiliary structure foundation pit and the main structure foundation pit;

constructing a bottom plate and a profile steel support-changing structure at intervals in the connection section of the auxiliary structure foundation pit and the main structure foundation pit;

removing part of the common main body building envelope in the connection section, and cutting off the cast-in-place pile to a designed elevation;

dismantling the profile steel support replacing structure, and performing construction joint waterproof treatment on the connection joint surface of the auxiliary structure foundation pit and the main structure foundation pit;

and performing secondary bottom plate pouring on the connection joint surface.

Preferably, the invention also relates to an integrated construction method of the auxiliary structure of the open cut station of the subway, which comprises the following steps:

excavating a foundation pit of a main structure of the station, and constructing a main enclosing structure of the station;

excavating a station auxiliary structure foundation pit which is connected with the station main structure foundation pit, and constructing a station auxiliary enclosure structure;

continuously constructing a bottom plate in a non-connection section of a foundation pit of the auxiliary structure of the station in a longitudinal segmentation and transverse segmentation mode and constructing a bottom plate and a section steel support changing structure in a connection section bay jumping mode;

removing part of the station main body enclosure structure shared by the connection section and the station main body structure foundation pit;

cutting off the cast-in-place pile structure shared by the connection parts to a designed elevation;

applying a capping beam in a chiseling area below a designed elevation cutting surface, and applying a secondary bottom plate post-cast strip;

dismantling the section steel support replacing structure, and performing construction joint waterproof treatment on the section steel support replacing structure and the connection joint surface where the secondary bottom plate post-cast strip is located;

and (4) performing secondary bottom plate pouring on the connection joint face where the section steel support replacing structure and the secondary bottom plate post-cast strip are located.

Preferably, constructing the body envelope according to the present invention may comprise the steps of:

constructing a concrete support and a main body enclosure structure crown beam on the top of a foundation pit of a main structure of a station;

constructing main body enclosure bored piles on the peripheral sides of the foundation pit of the main body structure of the station; and

constructing a main enclosure reinforcing steel bar net anchor spraying surface on the side of the main enclosure bored pile facing the station main structure foundation pit;

wherein the content of the first and second substances,

and the concrete support is connected with the crown beam of the main enclosure structure, the anchor spraying surface of the main enclosure reinforcing mesh and the main enclosure bored concrete pile to form the main enclosure structure of the station.

Preferably, the construction of the auxiliary building envelope of the present invention may comprise the steps of:

constructing a temporary steel support and an auxiliary enclosure structure crown beam at the top of a foundation pit of the station auxiliary structure;

constructing auxiliary enclosure bored cast-in-place piles on the peripheral sides of foundation pits of the auxiliary structure of the station; and

constructing an auxiliary enclosure structure reinforcing mesh anchor spraying surface on the side, facing the station auxiliary structure foundation pit, of the main enclosure bored pile;

wherein the content of the first and second substances,

and 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. Particularly, the auxiliary structure and the station main structure share part of the support enclosure structure, and the shared part can be used as a vertical and horizontal support system during excavation of the foundation pit of the auxiliary structure, so that the construction process is greatly simplified.

Preferably, the constructing of the bottom plate in the non-connection section and the jumping-cabin constructing of the connection section and the structural steel support changing structure in the foundation pit of the station auxiliary structure in the invention can comprise the following steps:

continuously pouring bottom plate concrete and side wall concrete in the non-connection sections along the longitudinal direction according to the sequence of the sections;

and at the connection section, sequentially spacing at least one section according to the sequence of the sections, and respectively and transversely constructing a bottom plate and side wall concrete pouring and section steel support changing structure in each section. According to the invention, the bottom plate and side wall concrete pouring is carried out in the connection section by using the jumping cabin construction, the temporary support changing treatment is carried out by using the section steel support changing structure, so that the stability of the auxiliary structure can be increased, the jumping cabin construction can simplify the construction progress, and the stress of the buffer structure can be relieved and released, so that the construction cracks of the connection joint surface of the main structure and the auxiliary structure of the station are reduced, the leakage of the structure of the station is prevented, and the structural stability is improved.

Preferably, the dismantling of part of the common station body envelope within the docking section may comprise the steps of:

and sequentially dismantling the temporary steel supports, the anchoring spray surface of the main body enclosure reinforcing mesh and the anchoring spray surface of the auxiliary enclosure reinforcing mesh in each section according to the sequence of the sections, and reserving the crown beam part.

Preferably, the cutting of the cast-in-place pile structure in the common body envelope to the design elevation in the present invention may comprise the steps of:

respectively erecting a main body side scaffold and an auxiliary side scaffold on the inner side and the outer side of a main body structure of a station, and cleaning an anchor spraying surface and soil between piles within a cutting range;

arranging hoisting holes on the side surfaces of the cast-in-place piles by using drilling equipment, and connecting the hoisting holes through hoisting ropes so as to stabilize a part of pile body to be cut off;

cutting off a segmented pile body with a preset length of the cast-in-place pile by using a rope saw in a mode of combining horizontal cutting and oblique cutting;

gradually removing the main body side scaffold and the auxiliary side scaffold to a height equivalent to that of the remaining pile body to be removed according to the length of the removed segmented pile body, and lifting and transporting the removed segmented pile body by using lifting equipment;

and (4) circulating the steps until the rest pile bodies are cut off to the designed elevation section by section in sequence.

Preferably, the method for applying the secondary bottom plate post-cast strip in the area below the designed elevation cutting surface comprises the following steps:

chiseling pile heads in the range of the capping beam below the designed elevation cutting surface;

reserving longitudinal steel bars within the range of the capping beam to be used as the capping beam;

and taking the roof pressing beam part as a secondary bottom plate post-cast strip.

Preferably, the dismantling of the profile steel support-replacing structure and the waterproof treatment of the construction joint of the connection joint surface of the auxiliary structure foundation pit and the main structure foundation pit in the invention can comprise the following steps:

sequentially dismantling the section steel support changing structures in the connection section according to the sequence of the sections, and cleaning plain soil in the post-pouring range;

coating a waterproof layer and a water stop strip on the cut surface of the common cast-in-place pile;

arranging a plurality of grouting pipes in the middle of one side of the secondary bottom plate to be cast, which faces the foundation pit of the main structure of the station, at intervals along the longitudinal direction, and arranging at least one water stop strip at each of the upper side and the lower side of each grouting pipe at intervals; and

and arranging a plurality of grouting pipes at intervals along the longitudinal direction at the bottom of one side of the secondary bottom plate to be poured, which faces the foundation pit of the auxiliary structure of the station. Particularly, the auxiliary structure and the main structure of the station are relatively long in connection range, so that the number and the length of construction joints are relatively large, special waterproof treatment is performed on the construction joints in a double-channel water-swelling water-stop glue and grouting pipe mode, leakage and water accumulation risks of the station can be remarkably reduced, and the durability of the structure of the station is improved.

Preferably, in the invention, the part of the station main body enclosure structure, which is shared by any bay jumping construction section in the connection section and the foundation pit of the station main body structure, is broken after the construction of the bottom plate and the section steel support replacing structure of at least the next bay jumping construction section is finished. Particularly, when the common main body building envelope in the connection section is dismantled, the to-be-dismantled bin transferring section is subjected to a certain holding time and then the corresponding dismantling process is carried out, so that the corresponding bin transferring section can fully release the concrete stress through the holding time, the sudden change of the concrete structure stress and the unexpected disturbance of a soil layer are avoided in the dismantling process, and the construction safety and the structural stability are ensured.

Preferably, in the invention, the designed elevation is a reference surface which is level with the original bottom plate of the foundation pit of the auxiliary structure of the station.

Drawings

Fig. 1 is a schematic plan view of a station main body structure and a station auxiliary structure integrally connected according to a preferred embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a station main structure and a station auxiliary structure integrally connected according to a preferred embodiment of the present invention;

FIG. 3 is a schematic plan view of a horizontal support structure system installed on a main structure and an auxiliary structure of a station according to a preferred embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a preferred embodiment of the present invention, illustrating the block pouring of the bottom plate of the station auxiliary structure and the support change of the section steel;

FIG. 5 is a schematic plan view of a preferred embodiment of the present invention, illustrating the floor of the station attachment structure in block pouring, removing the steel support and pile cutting in sectional construction;

FIG. 6 is a process flow diagram of the construction of sectional pouring, section steel removal, support replacement and pile cutting of a base plate of a station auxiliary structure according to a preferred embodiment of the invention;

fig. 7 is a schematic cross-sectional view of a preferred embodiment of the station accessory structure during cabin jump and support change provided by the invention;

fig. 8 is a schematic cross-sectional view illustrating waterproof construction at a docking position of a base plate of a station attachment structure according to a preferred embodiment of the present invention;

fig. 9 is a schematic cross-sectional view illustrating waterproof construction of a construction joint of a station auxiliary structure according to a preferred embodiment of the present invention;

fig. 10 is one of schematic cross-sectional views illustrating the construction of a station attachment structure cutting fender post according to a preferred embodiment of the present invention;

fig. 11 is a second schematic sectional view illustrating the construction of the cutting fender post of the station attachment structure according to the preferred embodiment of the present invention;

fig. 12 is a third schematic sectional view illustrating the construction of a cutting fender post for a station attachment structure according to a preferred embodiment of the present invention;

fig. 13 is a fourth schematic sectional view illustrating the construction of the cutting fender of the station attachment structure according to a preferred embodiment of the present invention;

fig. 14 is a fifth schematic sectional view illustrating the construction of a cutting fender post for a station auxiliary structure according to a preferred embodiment of the present invention;

fig. 15 is a sixth schematic sectional view illustrating the construction of a station attachment structure cutting fender in accordance with a preferred embodiment of the present invention.

List of reference numerals

1: a station main body structure; 2: a main body enclosure structure crown beam; 3: a main body enclosure bored pile; 4: spraying anchor surface of main body enclosure reinforcing mesh; 5: a station attachment structure; 6: an auxiliary enclosure structure crown beam; 7: auxiliary enclosure bored cast-in-place piles; 8: spraying anchor surface of main body enclosure reinforcing mesh; 9: the auxiliary enclosure reinforcing mesh spouts the anchor face; 10: supporting concrete; 11: temporary steel support; 12: a base plate; 13: a structural steel support replacing structure; 14: a water stop bar; 15: a grouting pipe; 16: a waterproof layer; 17: an auxiliary side scaffold; 18: a main body side scaffold; 19: secondary bottom plate post-pouring belt; a: backfilling plain soil; b: cutting the surface; c: hoisting holes; d: pile head breaking; e: a back surface.

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

The invention provides a construction method based on the integration of auxiliary structures of subway stations, which is particularly suitable for large stations such as station halls shared by two lines of urban subways or stations connected with inter-city stations. Because the demand for the space of entering the station is properly increased, the integrated design of the auxiliary structure of the subway station is needed, and the longitudinal connection and opening of the auxiliary structure of the station and the main structure of the station hall layer need to be considered during construction.

Further, the invention relates to the sharing of the enclosing structure crown beam in the range that the integrated auxiliary structure and the main structure are connected and opened, and the construction and the dismantling of the concrete cast-in-place pile and the suspended net spray anchor; after the construction of the main structure of the station is finished, when the auxiliary structure is constructed for the second time, the main structure is connected with the construction joint and the deformation joint in the range of opening the hole; and in the range of the connection and the opening, the auxiliary bottom plate structure is reserved with a post-pouring belt, and the construction method comprises the complex procedures of support replacement, secondary pouring of a skip bin and the like.

Fig. 1 and 2 show application scenarios of the present invention in some preferred embodiments, and specifically show an integrated auxiliary structure project in which a large number of connecting and opening holes are externally hung on both longitudinal sides of a main body of an open cut station of a subway. Specifically, referring to fig. 1 and 2, the station structure is composed of a station main structure 1 and station auxiliary structures 5 distributed on both sides thereof. Further, in the length or the longitudinal direction of the main structure 1 of the station, the main structure 1 of the station and the auxiliary structure 5 of the station are relatively wide in connection and open the hole, which is about more than 60%, and the connection points of construction are weak zones, so that the number of construction joints and deformation joints in the connection range is increased easily due to improper construction measures, thereby causing the risk of station leakage, easily causing water leakage, and causing the problems of station ponding, concrete corrosion, reinforcement cage corrosion and the like. In particular, with reference to fig. 1, the access opening range in the present invention may represent the portion of the station main structure 1 and the station auxiliary structure 5 that are laterally communicable.

The invention provides an integrated construction method for an auxiliary structure of a subway open cut station, which comprises the following steps:

and excavating a foundation pit of the main structure of the station, and constructing a main enclosure structure of the station.

And excavating a foundation pit of the station auxiliary structure, and constructing the station auxiliary enclosure structure.

And continuously constructing a bottom plate in a non-connection section of the foundation pit of the auxiliary structure of the station in a longitudinal segmentation and transverse segmentation mode, and constructing the bottom plate and the section steel support-changing structure in a bay jumping mode of the connection section.

And removing part of the station main body enclosure structure shared with the foundation pit of the station main body structure in the connection section.

And cutting off the cast-in-place pile structure shared by the connection parts to the designed elevation.

And applying a capping beam in a chiseling area below the designed elevation cutting surface, and applying a secondary bottom plate post-cast strip.

And (3) dismantling the section steel support replacing structure, and carrying out construction joint waterproof treatment on the connection joint surface where the section steel support replacing structure and the secondary bottom plate post-cast strip are located.

And performing secondary bottom plate pouring on the connection joint surface where the section steel support replacing structure and the secondary bottom plate post-cast strip are located.

Preferably, in the present invention, the foundation pit of the main structure of the station and the foundation pit of the auxiliary structure of the station are at least partially connected, that is, at least partially communicated with each other in the transverse direction.

Preferably, in the invention, the station main body building envelope and the station auxiliary building envelope generally comprise supporting building envelopes such as a crown beam, a cast-in-place pile, a concrete support or a steel support, a net-hanging spray-anchoring support and the like.

Preferably, in the present invention, the longitudinal section may mean that the station attachment structure is sequentially divided into a plurality of sections in a longitudinal direction. The transverse segmentation can be used for dividing each section along the auxiliary structure of the station into a plurality of blocks along the transverse direction for sequential construction, wherein the construction can comprise a construction bottom plate, a temporary steel support changing structure and the like.

Preferably, in the invention, the warehouse jump construction of the bottom plate and the section steel support changing structure can mean that at least one section is separated in the connecting section and the bottom plate and the section steel support changing structure are transversely constructed in each section.

According to a preferred embodiment, as shown in fig. 1 to 3, the station main body envelope may include a main body envelope crown beam 2, a concrete support 10, a main body envelope bored pile 3, and a main body envelope steel mesh anchoring surface 4 (and 8). Specifically, as shown in fig. 3, the concrete supports 10 are arranged on the top surface of the foundation pit of the station main body structure 1 along the longitudinal gap of the foundation pit of the station main body structure 1. As shown in fig. 1 and 2, a plurality of main enclosure bored concrete piles 3 are inserted into the foundation pit along the depth direction of the foundation pit of the main structure of the station and surround the periphery of the foundation pit of the main structure of the station.

Further, a main enclosure reinforcing mesh anchoring spraying surface 4 (and 8) is arranged on the inner side of the station main structure 1 and/or one side of the main enclosure bored pile 3 facing the station main structure 1. Particularly, the main body enclosure structure crown beam 2 is arranged on the top surface of a foundation pit of the station main body structure 1 and is connected with the concrete support 10, the main body enclosure reinforcing mesh anchoring surface 4 (and 8) and the main body enclosure bored concrete piles 3 to jointly form a main body support structure system. In the invention, the main enclosure bored concrete piles 3 can be arranged at the connection part of the station main structure 1 and the station auxiliary structure 5 and can be used as a common supporting structure of the station auxiliary structure 5.

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

According to a preferred embodiment, as shown in fig. 1 to 3, the station subsidiary enclosure may include subsidiary enclosure crown beams 6, subsidiary enclosure bored piles 7, temporary steel supports 11, and subsidiary enclosure reinforcing mesh anchoring surfaces 9. Specifically, as shown in fig. 3, temporary steel braces 11 are arranged on the top surface of the foundation pit of the station auxiliary structure 5 along the longitudinal gap of the foundation pit of the station auxiliary structure 5. A plurality of auxiliary enclosure bored concrete piles 7 can be inserted into the foundation pit of the station auxiliary structure 5 along the depth direction of the station auxiliary structure 5 and are arranged in the circumferential direction of the station auxiliary structure 5.

Further, as shown in fig. 1, an auxiliary enclosure reinforcing mesh anchoring surface 9 is provided inside the station auxiliary structure 5 and/or on a side of the auxiliary enclosure bored pile 7 facing the station auxiliary structure 5. Particularly, the auxiliary enclosure structure crown beam 6 can be arranged on the top surface of a foundation pit of the station auxiliary structure 5 and is connected with the temporary steel support 11, the auxiliary enclosure reinforcing mesh anchoring surface 9 and a plurality of auxiliary enclosure bored concrete piles 7 to form an auxiliary support structure system.

Fig. 3 shows the installation and erection of the foundation pit horizontal temporary supports of the station auxiliary structure 5 by using the original station main structure 1 crown beam and fender piles according to a preferred embodiment. Specifically, in the invention, the station auxiliary enclosure structure can utilize the original main enclosure structure system in the range of transverse connection with the station main structure 1. Specifically, as shown in fig. 2 to 4, when the station auxiliary enclosure structure is constructed, only the enclosure structures on the remaining three sides of the station auxiliary structure foundation pit can be constructed, and the main enclosure structure crown beam 2, the main enclosure bored concrete pile 3 and the like of the original station main enclosure structure are respectively connected with the other three newly constructed auxiliary enclosure structure crown beams 6, the auxiliary enclosure bored concrete piles 7 and the like to form an enclosure structure ring which is closed into a ring. And the support system is used as a vertical and horizontal support system when the foundation pit of the station auxiliary structure 5 is excavated.

According to a preferred embodiment, after the foundation pit of the station auxiliary structure 5 is dug and the station auxiliary enclosure structure is constructed, an auxiliary structure bottom plate 12 and/or a section steel support changing structure 13 are constructed at the bottom of the foundation pit of the station auxiliary structure 5, and the construction is shown in fig. 4.

According to a preferred embodiment, fig. 4 to 6 show the position relation between the temporary support dismantling and the profile steel back support, the cutting of the original main body guard post and the like and the construction process of jumping from a warehouse when the auxiliary main body structure of the station auxiliary structure 5 is implemented after the foundation pit of the earth excavation is found at the bottom, the base plate is segmented and partitioned with the existing station main body structure 1 engineering within the longitudinal connection and opening range, and the temporary support dismantling and the profile steel back support are replaced.

Particularly, the construction of the jumping warehouse means that in the construction of a large-volume concrete structure, an overlong concrete block is divided into a plurality of small blocks for construction at intervals at the early stage of large temperature shrinkage stress, the small blocks are connected into a whole at the later stage of small shrinkage stress through short-term stress release, and the temperature shrinkage stress at the next stage is resisted by the tensile strength of the concrete. According to the invention, the construction progress can be simplified by using the skip construction, the construction cracks of the connection joint surface of the main station structure 1 and the auxiliary station structure 5 can be obviously reduced, the leakage of the station structure is prevented, and the stability of the station structure is improved.

According to a preferred embodiment, referring to fig. 5 and 6, the station auxiliary structure 5 is divided into several sections along its longitudinal direction, including a non-docking section outside the docking range of the station main structure foundation pit and the station auxiliary structure foundation pit and a docking section within the docking range of the station main structure foundation pit and the station auxiliary structure foundation pit. Specifically, as shown in fig. 5 and 6, a bottom plate is continuously constructed in a partial section outside the connection range of the foundation pit of the main structure of the station and the foundation pit of the auxiliary structure of the station; and constructing a bottom plate and a section steel support-changing structure at intervals in a part of sections within the connection range of the foundation pit of the main structure of the station and the foundation pit of the auxiliary structure of the station.

For the convenience of understanding, the position relationship between the bottom plate segmentation, the block division, the temporary support removal and the replacement of the profile steel back support, the cutting of the original main body guard post and the like, the cabin jump construction process and the like according to the invention will be described in detail with reference to fig. 5 and 6.

Specifically, as shown in fig. 5, it is assumed that the station attachment structure 5 is divided into 10 sections of 1 st to 10 th sections in the longitudinal direction. Specifically, the station main body structure 1 and the station auxiliary structure 5 include 3 rd to 7 th sections in the transverse connection range; the station main body structure 1 and the station auxiliary structure 5 comprise a 1 st section, a 2 nd section and 8 th to 10 th sections in a transverse non-connection range.

According to a preferred embodiment, as shown in fig. 5 and 6, the bottom plate 12 and the side wall concrete are sequentially poured from the 1 st section to the 2 nd section along the longitudinal direction of the station auxiliary structure 5. Particularly, in the construction within the transverse connection range, the skip construction is adopted, namely, referring to fig. 5 and 6, the bottom plate 12 and the section 3 'and the section 5' are sequentially and alternately constructed, and the section steel support changing structure 13 is sequentially constructed according to the sequence of the section 3, the section 5 and the section 7.

And then, continuously constructing the bottom plate 12 and the side wall concrete pouring in the transverse non-connection range, namely continuously constructing according to the sequence from the section 8 to the section 10 shown in the figure 5. On the other hand, after the bottom plates 12 of the 3 rd section, the 5 th section and the 7 th section and the section steel support changing structures 13 of the 3' th section, the 5' th section and the 7' th section in the transverse connection range are finished, the skip construction of the remaining sections is finished, that is, the section steel support changing structures 13 are formed by forming the bottom plates 12, the 4' th section and the 6' th section in the sequence shown in fig. 5. In the process of cabin jumping construction, construction of each cabin adjusting section generally needs to be carried out at certain intervals of holding time, and then construction of the next section is carried out, so that concrete stress is fully released through the holding time. In particular, the holding time is generally about several days to ten days.

Particularly, when a foundation pit of the station auxiliary structure 5 is excavated to meet the bottom and is used as an auxiliary structure bottom plate 12, the structure bottom plate is longitudinally segmented according to the designed length; and (3) carrying out block secondary construction in the transverse width direction (namely, the bottom plate 12+ structural steel is changed into a structure 13), wherein the size of each block is determined according to the operation space required by the construction process of the original main body fender pile at the subsequent connection opening position of the auxiliary structure and the main body structure.

In an optional embodiment, the first time of pouring of the bottom plate 12 is performed along the width direction to a part which is about 3/4 of the part of the docking fender pile (i.e., the main body enclosure bored pile 3) away from the station main structure 1, and the second time of pouring of the bottom plate 12 is performed after the original docking fender pile (i.e., the main body enclosure bored pile 3) is dismounted at the docking part of the station main structure 1, i.e., the bottom plate 12 is poured in the remaining part which is about 1/4 of the part of the plate beam connection in the station main structure 1. Specifically, as shown in fig. 7, after about 3/4 of the part of the base plate 12 away from the connection enclosure pile (i.e., the main enclosure bored pile 3) is poured for the first time, in order to reasonably and safely change the stress of the enclosure structure supporting system, foundation pit bottom plain soil backfill a and support change treatment by installing the section steel support changing structure 13 are performed between the newly manufactured secondary auxiliary structure base plate 12 and the original connection enclosure pile (i.e., the main enclosure bored pile 3).

In an alternative embodiment, the section bar support changing structure 13 can be welded securely to the i-section bar. Specifically, the I-steel is 145C I-steel of phi 25@ 300. Further, the welding pitch of the i-beams in the longitudinal direction of the station attachment structure 5 is, for example, 1500mm.

Further, after the bottom plate 12 and the side wall concrete pouring and section steel support changing structure 13 in the connection section of the station auxiliary structure 5 are finished, the temporary support systems in the connection sections are still sequentially detached according to the jump construction sequence, the anchor spraying surfaces of the reinforcing mesh inside and outside the original fender pile at the connection part are detached, and the original fender pile is cut to the designed elevation in sections. And then, performing waterproof infiltration treatment on the cut pile top of the connection part and other construction joints, and performing secondary pouring of the bottom plate concrete. Specifically, when the reinforcing mesh bolting surface inside and outside the original fender pile at the connection site is removed, only the reinforcing mesh bolting support of the common part of the main foundation pit and the auxiliary foundation pit, that is, the main body fender reinforcing mesh bolting surface 8 shown in fig. 4 is removed.

Specifically, referring to fig. 5 and 6, the temporary support system of the 3' th section (specifically, the temporary steel support 11 shown in fig. 3 and 4) is removed first. Further, after the temporary support system of the 3 'th section is removed correspondingly, as shown in fig. 6, the method further includes removing the internal and external reinforcing mesh anchoring spraying surfaces (specifically, the main enclosure reinforcing mesh anchoring

spraying surface

4 or 8 and the auxiliary structure reinforcing mesh anchoring spraying surface 9 shown in fig. 1) of the original enclosure pile at the connection site of the a-th section (the 3' th section), and cutting the original enclosure pile (specifically, the main enclosure bored concrete pile 3 shown in fig. 1) to the designed elevation in sections. And then, performing anti-seepage treatment on the cut pile top and other construction joints of the base plate connection part of the 3' section, and performing secondary base plate 12 pouring on the part between the connection position and the original base plate 12 (such as the part comprising the section steel support replacing structure 13).

Further, according to the skip construction sequence of the 3' section (the a-th section), the 5' section (the c-th section) and the 7' section (the e-th section) shown in fig. 5, the temporary support system, the removal of the anchor spraying surfaces of the reinforcing mesh inside and outside the original fender post, the removal of the original fender post to the designed elevation, the waterproof leakage treatment of the joint seams and deformation seams at each part of the connection joint surface, and the secondary pouring of the bottom plate concrete are performed. In particular, in the present invention, the designed elevation may be a reference plane flush with the floor 12 in the station attachment structure 5 as shown in fig. 13.

In some optional embodiments, within the connection range, the supporting and enclosing structures (temporary supporting systems, reinforcing mesh anchoring and spraying surfaces) of any transfer construction section and the breaking of the enclosing piles can be performed after the processes of the bottom plate 12 and the section steel support changing structure 13 of the subsequent transfer construction section are performed. Or, the supporting and enclosing structures (temporary supporting systems and reinforcing mesh anchoring and spraying surfaces) of any bin-transferring construction section and the breaking of the enclosing piles can be carried out after the processes of the bottom plates 12 of the two subsequent bin-transferring construction sections, the section steel support-changing structures 13 and the like are completed. In other words, the supporting and enclosing structures (temporary supporting systems, reinforcing mesh anchoring and spraying surfaces) of any transfer construction section and the breaking of the enclosing piles are carried out after the processes of at least the bottom plate 12 of the next transfer construction section, the section steel support changing structure 13 and the like are finished.

In some optional embodiments, after the bottom plates 12 and the section steel support changing structures 13 of all the sections in the transfer construction section or the connection section are completely constructed, the support building envelope (the temporary support system, the reinforcing mesh anchoring spraying surface) and the enclosure piles are broken according to the original skip construction sequence. In particular, fig. 6 only shows one possible construction sequence, namely, after the bottom plates 12 and the section steel support changing structures 13 of the 3' th section (the a-th section) and the 5' th section (the c-th section) are completely constructed, the enclosure breaking process is performed from the 3' th section (the a-th section) according to the skip sequence. In particular, in the state shown in fig. 6, when the 3 'th section (a-th section) is broken, the 3' th section (a-th section) will undergo a preset holding time so that the concrete stress therein is sufficiently relieved and released. On the other hand, in other scenarios, the breaking nodes and/or the sequence of the support envelope and the enclosure piles may be determined according to specific engineering requirements, and are not limited to the construction sequence shown in fig. 6.

According to a preferred embodiment, when the temporary support system in each section of the connection range is removed, the spraying surfaces of the reinforcing mesh inside and outside the original enclosure pile at the connection position are removed, and the original enclosure pile is cut to the designed elevation in sections, the upper crown beam structure, namely the main enclosure structure crown beam 2 and/or the auxiliary enclosure structure crown beam 6 shown in fig. 2, needs to be reserved.

According to a preferred embodiment, fig. 8 shows a schematic structural view of a waterproofing process at the connection and pouring position of the bottom plate of the station auxiliary structure 5 after the temporary support system is removed and the original fender post structure is broken to the designed elevation.

Specifically, after the original fender pile structure, namely the main body fender bored pile 3 shared by the connection position, is cut to the designed elevation, the bottom plate capping beam range is chiseled off and the pile body pile top is cut, the I-steel is detached, and the plain soil in the post-pouring range is cleaned. And cleaning the surface of the main enclosure bored pile 3 with clear water, cutting and leveling the racking coiled materials at two sides of the main enclosure bored pile 3, and sealing by using 50 multiplied by 50 sealant. In an optional embodiment, a side wall waterproof layer and a waterproof reinforcing layer may be disposed between the remaining main body enclosure bored pile 3 and the station main structure 1.

Further, a waterproof layer 16 is coated on the surface of the main body enclosure bored pile 3. In an alternative embodimentIn the formula, the waterproof layer 16 may be a cement-based capillary crystalline coating. In particular, the cement-based infiltration crystallization coating has a density of about 2kg/m ² . Then, the root of each anchor bar of the main body enclosure bored concrete pile 3 is tightly attached to the water-swelling water stop strip 14. Specifically, as shown in fig. 8, the water stop strip 14 may be attached to a joint portion between a root portion of each anchor bar of the main body enclosure bored pile 3 and the waterproof layer 16. In particular, a concrete pad is provided between the waterproof layer 16 and the bottom of the station auxiliary structure 5.

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

Particularly, because the connection part of the station auxiliary structure 5 and the station main structure 1 cannot embed a water stop belt in advance during construction of the station main structure 1, but the connection range of the station auxiliary structure 5 and the station main structure 1 has large quantity and length of construction joints, waterproof treatment needs to be carried out according to a special waterproof construction joint method during construction, and a form of double-channel water swelling water stop glue and a grouting pipe is used.

Specifically, as shown in fig. 8, a plurality of grouting pipes 15 are provided at intervals in the longitudinal direction in the middle of the side of the floor panel 12 facing the station main body structure 1. Specifically, the setting clearance of the grouting pipe 15 is, for example, 2m to 4m, 3m to 5m, or 5m to 6m. The setting clearance of the grouting pipe 15 can be specifically determined according to the site construction scene. Furthermore, at least one water stop strip 14 is arranged on the upper side and the lower side of the grouting pipe 15 at intervals. In particular, the distance between the water stop strip 14 and the grouting pipe 15 is, for example, 100mm. On the other hand, as shown in fig. 8, a plurality of grouting pipes 15 are provided at the bottom of the floor 12 on the side facing the station auxiliary structure 5. The specific arrangement of the gap can be referred to above.

Fig. 9 shows a schematic cross-sectional view of a waterproof construction of a construction joint of the station auxiliary structure 5 according to a preferred embodiment. Specifically, referring to fig. 8 and 9, at least one grouting pipe 15 is placed into the bottom plate 12 from the back surface e and extends to the construction joint, wherein at least one water stop 14 is respectively arranged on the left side and the right side of the grouting pipe 15 in a manner of being attached to the construction joint. In particular, the distance between the water stop bar 14 and the grouting pipe 15 is, for example, 100mm.

Fig. 10 to 14 show that in order to reduce the influence on the existing main structure, the guard piles (main enclosure bored concrete piles 3) break through the section cutting by the static force of a diamond wire saw, and the hoisting holes (c) are drilled by the aid of a water drill; and (3) combining factors such as construction safety, site working conditions and the like, vertically and sectionally removing the broken pile body, and constructing by adopting an oblique cutting mode and a horizontal cutting mode. The construction steps are as follows:

the first process step: according to the site construction flowing water section, scaffolds are respectively erected on the inner side and the outer side of the station main body structure 1. Specifically, referring to fig. 10, a main-side scaffold 18 is erected on the side of the main-containment rebar net anchor-spraying surface 4 of the fender pile, i.e., the main-containment bored pile 3, and an auxiliary-side scaffold 17 is erected on the side of the auxiliary-containment rebar net anchor-spraying surface 9. After the two side scaffold hand frames are erected, the spraying anchor surfaces (the main body enclosure reinforcing mesh anchoring spraying surface 4 and the auxiliary enclosure reinforcing mesh anchoring spraying surface 9) and the soil between piles in the whole cutting range are broken section by section respectively, and after the residue soil is cleaned, the inner side scaffold frame and the outer side scaffold frame (namely the auxiliary side scaffold 17 and the main body side scaffold 18) of the station main structure 1 can be disassembled.

And a second step: after the cleaning of the soil between piles and the anchor spraying surfaces at two sides is finished, a scaffold is erected at the side of the foundation pit of the auxiliary station structure 5, after the erection is finished, a first section of segmented pile body with a preset length is cut off, and the segmented pile body is hoisted and transported outside by using a crane. Specifically, as shown in fig. 11, when the first section of the segmented pile body is cut off, a water drill is used to lay a hoisting hole c at a proper position, the hoisting hole c penetrates through a steel wire rope and is stabilized by a crane, and then a rope saw is used to horizontally and obliquely cut the upper and lower cutting surfaces b, wherein the oblique cutting is beneficial to hoisting and taking out the segmented pile body. In particular, the length of the first section of segmented pile body is about 500mm. Preferably, the water drill punching positions can be on two sides of the pile body.

And a third step of: referring to fig. 12, after the first section of pile body is cut, 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 sectional pile body, so as to lift the first section of pile body. And then, circularly carrying out the steps of sequentially arranging hoisting holes at proper positions of cutting sections divided from top to bottom in the range of the broken pile body by using a water drill, arranging the hoisting holes c, penetrating through a steel wire rope, stabilizing by using a crane, and respectively carrying out horizontal and oblique cutting on the upper cutting face b and the lower cutting face b by using a rope saw until the rest of the pile body is cut off to the designed elevation section by section in sequence.

Step four: referring to fig. 13, before the last section of the segmented pile body is cut, the auxiliary side scaffold 17 on one side of the auxiliary structure is removed to a corresponding design elevation, a water drill is used for drilling a hoisting hole c on the surface of the pile body, after the pile body passes through a steel wire rope and is hoisted stably by a crane, the pile body and the plate interface of the station main body structure 1 are subjected to horizontal cutting and hoisting taking out by a rope saw, and the whole rope saw cutting work of the pile body is completed.

And a fifth step: after the last section of the segmental pile body is cut to reach the designed elevation, the scaffolds on both sides are dismantled, as shown in fig. 14. Specifically, the design level is a reference plane flush with the floor 12 in the station attachment structure 5 as shown in fig. 13. Further, after the common guard piles (namely the main body guard bored pile 3) are cut to the designed elevation, pile heads within the range of the capping beam below the horizontal cutting line are manually chiseled (namely the pile head d is broken), and the capping beam is applied.

Further, as shown in fig. 15, after the pile head within the range of the lower capping beam of the horizontal cutting line is manually chiseled (i.e. the pile head d is broken), and the capping beam is applied, a secondary bottom plate post-cast strip 19 is reserved at the capping beam. Particularly, by constructing the secondary bottom plate post-cast strip 19, the bottom plate casting can be carried out at the secondary bottom plate post-cast strip 19 subsequently, so that the transverse connection opening ranges of the main station structure 1 and the auxiliary station structure 5 are communicated into a whole, and the connection positions of the main station structure and the auxiliary station structure are kept flat. Specifically, for example, the secondary floor casting may be performed using the grout pipe 15 shown in fig. 8 and 9.

According to a preferred embodiment, as shown in fig. 12, in the third process, when the cutting of the first section of pile is completed and 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 sectional pile, the main side scaffold 18 on one side of the main structure should also be simultaneously removed from top to bottom according to the cutting height of the sectional pile to be flush with the auxiliary side scaffold 17, so as to ensure the smooth proceeding of the removal and hoisting of the sectional pile.

In some alternative embodiments, the angle of the oblique cut is, for example, 20 °, 30 °, 45 °, or other possible cut inclination angles. Further, the length of each segment of pile body cut by segments is about 1.0m to 1.5m, for example. It should be noted that the angle of the oblique cutting and the cutting length of the segmented pile are only for illustration, and the cutting angle and the length of the segmented pile should be determined according to the length/depth of the foundation pit, the hoisting process, the safety of the site construction, and other factors according to the different construction scenarios.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims

1. A subsection construction method for a main body and an auxiliary structure of an underground station is characterized by comprising the following steps:

continuously constructing a bottom plate in a non-connection section of the foundation pit of the station auxiliary structure and constructing a bay jump of the connection section to construct the bottom plate and the section steel support changing structure;

removing part of the main body structure foundation pit in the connection section to form a main body enclosure structure, and cutting off the common cast-in-place pile to a designed elevation;

and performing secondary bottom plate pouring on the connection joint surface.

2. A construction method of a subway station structure with a main body and an auxiliary body, which is characterized by comprising the following steps:

constructing an auxiliary enclosure structure in the foundation pit of the auxiliary structure;

constructing a bottom plate on the non-connection section of the foundation pit of the auxiliary structure and the foundation pit of the main structure;

and performing secondary bottom plate pouring on the connection joint surface.

3. An integrated construction method for an auxiliary structure of a subway open cut station is characterized by comprising the following steps:

a foundation pit of a main structure of the station is excavated and used as a main enclosure structure of the station;

open excavation of a station auxiliary structure foundation pit connected with the station main structure foundation pit and construction of a station auxiliary enclosure structure;

continuously constructing a bottom plate in a non-connection section of the foundation pit of the station auxiliary structure in a longitudinal segmentation and transverse segmentation mode and constructing a bottom plate and a section steel support changing structure in a connection section jumping warehouse;

removing part of station main body enclosure structures which are shared by the connection section and the station main body structure foundation pit;

applying a capping beam and a secondary bottom plate post-cast strip in a chiseling area below the designed elevation cutting surface;

dismantling the section steel support replacing structure, and performing construction joint waterproof treatment on the section steel support replacing structure and a connection joint surface where a secondary bottom plate post-cast strip is located;

4. The construction method according to any one of claims 1 to 3, wherein constructing the main body envelope comprises:

constructing a concrete support (10) and a main body enclosure structure crown beam (2) at the top of a foundation pit of a main structure of a station;

constructing main body enclosure bored cast-in-place piles (3) on the periphery of a foundation pit of a main structure of a station; and

constructing a main enclosure reinforcing mesh anchor spraying surface (4) on the side of the main enclosure bored pile (3) facing the foundation pit of the station main structure;

wherein the content of the first and second substances,

the concrete support (10) is connected with a main enclosure structure crown beam (2), a main enclosure reinforcing mesh anchor spraying surface (4) and a main enclosure bored pile (3) to form the main enclosure structure.

5. The construction method according to any one of claims 1 to 3, wherein constructing the station subsidiary enclosure comprises:

constructing a temporary steel support (11) and an auxiliary enclosure structure crown beam (6) at the top of a foundation pit of a station auxiliary structure;

constructing auxiliary enclosure bored cast-in-place piles (7) on the peripheral sides of foundation pits of the station auxiliary structure; and

constructing an auxiliary enclosure structure reinforcing mesh anchor spraying surface (9) on the side of the main enclosure bored pile (3) facing the station auxiliary structure foundation pit;

wherein the content of the first and second substances,

and 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, wherein constructing the bottom plate in the non-connection section and the connection section bay of the foundation pit of the station auxiliary structure and constructing the bottom plate and the section steel support-changing structure comprises:

and at least one section is sequentially arranged at intervals according to the sequence of the sections in the connection section, and a bottom plate and side wall concrete pouring and section steel support changing structure is transversely applied to each section.

7. The construction method according to any one of claims 1 to 3, wherein removing a part of a common station main body envelope inside the docking section comprises:

and sequentially dismantling the temporary steel supports (11), the main body enclosure reinforcing mesh anchoring spraying surface (8) and the auxiliary enclosure reinforcing mesh anchoring spraying surface (9) in each section according to the sequence of the sections.

8. The construction method according to any one of claims 1 to 3, wherein cutting off the cast-in-place pile structure in the shared main enclosure to a design elevation comprises:

respectively erecting a main body side scaffold (18) and an auxiliary side scaffold (17) on the inner side and the outer side of a main body structure (1) of the station, and cleaning an anchor spraying surface and soil between piles within a cutting range;

arranging hoisting holes (c) on the side faces of the cast-in-place piles by using drilling equipment, and connecting the hoisting holes (c) through hoisting ropes for stabilizing part of pile bodies to be cut off;

according to the length of the cut segmented pile body, gradually removing the main body side scaffold (18) and the auxiliary side scaffold (17) to a height equivalent to that of the residual pile body to be cut, and hoisting and transporting the cut segmented pile body by using hoisting equipment;

9. The construction method according to any one of claims 1 to 3, wherein applying a secondary floor post-cast strip below a design elevation cut surface comprises:

chiseling pile heads within the range of the capping beam below the designed elevation cutting surface;

reserving longitudinal steel bars in the range of the capping beam to be used as the capping beam;

and taking the coping beam part as a secondary bottom plate post-cast strip.

10. The construction method according to any one of claims 1 to 3, wherein the dismantling of the section steel support-replacing structure and the waterproofing treatment of the joint surface of the auxiliary structure foundation pit and the main structure foundation pit by the construction joint comprises:

sequentially dismantling the section steel support changing structures in the connection section according to the section sequence, and cleaning plain soil in a post-pouring range;

coating a waterproof layer (16) and a water stop strip (14) on the cut surface of the common cast-in-place pile;

arranging a plurality of grouting pipes (15) in the middle of one side of the secondary bottom plate to be poured, which faces the foundation pit of the main structure of the station, at intervals along the longitudinal direction, and arranging at least one water stop strip (14) at intervals on the upper side and the lower side of each grouting pipe (15); and

and a plurality of grouting pipes (15) are arranged at intervals along the longitudinal direction at the bottom of one side of the secondary bottom plate to be poured, which faces the foundation pit of the auxiliary structure of the station.