CN215906845U - Large-span vestibule mounting structure in foundation pit - Google Patents

Abstract

The utility model discloses a large-span corridor installation structure in a foundation pit, which comprises an engineering pile arranged at the bottom of the foundation pit, a basement foundation bottom plate connected to the top of the engineering pile, a corridor structure column connected to the basement foundation bottom plate, a ground corridor wall connected to the periphery of the foundation pit, basement beam plates connected to the vertical direction of the ground corridor wall at intervals and a corridor connected to the top of the corridor structure column. The utility model is beneficial to the construction of the corridor at the top through the combined action of the corridor structural column and the engineering, and the corridor structural column and the basement beam plate can be synchronously constructed, thus being beneficial to saving working hours; through the setting of the independent creeping formwork system of stand, do benefit to and carry out independent construction according to every vestibule structure post to can compromise the construction of basement beam slab.

Description

Large-span vestibule mounting structure in foundation pit

Technical Field

The utility model belongs to the technical field of building construction, and particularly relates to a large-span corridor installation structure in a foundation pit.

Background

Along with the development of the construction industry, more and more twin tower buildings, new buildings and old buildings connected buildings are continuously developed, and the twin tower buildings are often developed in stages due to the large building size, long development period, uncertain market and the like and the planning problem of city start. Therefore, in order to connect the twin towers together to form an overall development value, it is necessary to erect a corridor (including an overground corridor and an underground passage) between the twin towers. However, due to the fact that the super high-rise is mostly located in a commercial core area, traffic is busy, particularly, a large-span street-crossing corridor relates to long-term road occupation construction and affects traveling, efficient construction of the street-crossing corridor becomes a key factor of super high-rise construction, and how to quickly install and construct the connecting corridor becomes a difficult problem. The corridor practice adopts a forward method, a reverse method and the like, however, both methods have advantages and disadvantages due to the problems of cost and construction period. The reverse construction method accelerates the construction period of the overground project, but slows down the construction period of the basement, and delays the final acceptance time of the project. The construction method can lead to the construction completion time lag of the ground structure, and the insertion time of other specialties is late, so that the whole acceptance of later-stage engineering is restricted and influenced, and great risk is caused.

Therefore, the installation structure and the construction method with pertinence are adopted to construct the overpass of the super high-rise large-span deep foundation pit, the construction progress on the ground is further ensured, other major in the ground can be ensured to be inserted into the corridor for construction as soon as possible, the cost and the construction period are considered, the engineering construction period is shortened to a greater extent, the construction cost is reduced, the cost reduction and the efficiency improvement of the engineering are realized, and the method is a key point and a difficult point of research.

SUMMERY OF THE UTILITY MODEL

The utility model provides a large-span corridor installation structure in a foundation pit, which is used for solving the technical problems of convenient and fast combined installation of a large-span corridor and a basement along a street, targeted design of corridor structure columns, synchronous installation in a limited space and the like.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a large-span corridor installation structure in a foundation pit comprises an engineering pile arranged at the bottom of the foundation pit, a basement foundation bottom plate connected to the top of the engineering pile, a corridor structure column connected to a basement foundation plate, a ground corridor wall connected to the periphery of the foundation pit, basement beam plates connected to the ground corridor wall in a vertical direction at intervals and a corridor connected to the top of the corridor structure column;

the basement beam slab is arranged corresponding to the basement beam slab elevation, and a temporary support is arranged under the basement beam slab elevation;

the temporary support comprises an inner support and a vertical column pile;

corridor structure post still can dismantle with the independent creeping formwork system of stand and be connected, and is provided with basement beam slab at the vertical upper interval of corridor structure post and gets rid of the muscle, and basement beam slab gets rid of the muscle and corresponds basement beam slab and set up one by one.

Furthermore, the upright post pile and the engineering pile are both rotary excavating cast-in-place piles, the entering-in slightly weathered rock bearing layer of the end of the anti-pressure pile in the upright post pile is not less than 0.5m, and the entering-in slightly weathered rock bearing layer of the end of the anti-pulling pile is not less than 0.5 m; an ultra-long pile casing is arranged on the outer side of the upright post pile.

Furthermore, the corridor comprises a steel truss structure and a profiled steel plate structure, and the corridor comprises corridor truss columns and corridor structure beam plates in the vertical direction which are arranged horizontally and upwards at intervals; and the length of the corridor structure beam plate is greater than that of the foundation pit and is fixedly connected with the built buildings around.

Furthermore, an I-steel joint is arranged at the joint of the adjacent ground connecting walls, a splicing steel plate of the I-steel joint is welded with the steel bar of the prior groove section, and the joint steel bar arranged at the subsequent groove section extends into the splicing steel plate area of the joint; square foam and sand bags are filled at the joints, and a grout stopping plate is additionally arranged on the back soil side in the wall.

Furthermore, a jig frame is arranged at the beam slab of the basement, and the jig frame is connected with the bracket of the corridor structure column in a welding mode and connected with the inner support and/or the upright column pile through embedded parts.

Further, the corridor structure column is a steel column, and the steel column comprises a square pipe column and a cross steel rib and/or an H-shaped steel rib which are connected inside the square pipe column; the steel column is internally poured with gallery column concrete and is connected with gallery column inner ribs.

Furthermore, an independent column climbing formwork system is connected to the square tubular column horizontally in an embedded mode at intervals and comprises a climbing formwork connecting piece and a climbing formwork platform, wherein the climbing formwork connecting piece is connected with the square tubular column; the creeping formwork platform corresponds the setting around vestibule structure post.

Further, creeping formwork platform and protection system all are provided with hydraulic protection screen device all around, and every vestibule structure post sets up one set of independent hydraulic protection screen system.

Further, it is provided with the pre-buried muscle to correspond the vestibule on the vestibule structure post, and pre-buried muscle department is connected with steel bar connector, and steel bar connector outer end just is no less than 15mm at the inboard pillar limit.

The utility model has the beneficial effects that:

1) the utility model is beneficial to the construction of the corridor at the top through the combined action of the corridor structural column and the engineering, and the corridor structural column and the basement beam plate can be synchronously constructed, thus being beneficial to saving working hours;

2) according to the utility model, through the arrangement of the stand column independent creeping formwork system, independent construction is favorably carried out according to each corridor structure column, and the construction of the basement beam plate can be considered;

3) the foundation pit support and the basement structure are sequentially constructed, the ground structure is constructed by adopting a semi-reverse construction method, the foundation pit support and the basement structure are combined with cross construction, the construction efficiency can be effectively improved, the cost is saved, the ground structure is quickly constructed, more operation time is provided for other professional insertion construction, and the project delay risk is reduced;

the method comprises the steps of firstly completing the construction of a diaphragm wall maintenance structure and a support column on the ground, then excavating earthwork in sequence, constructing an inner support and a bottom plate, then adopting a creeping formwork to construct a corridor structure column to a corridor structure layer on the ground, installing a corridor steel structure, constructing other structure floors upwards in sequence, and synchronously inserting the corridor structure column into a basement structure and dismantling the inner support during construction; therefore, the ground and underground structure is convenient to operate, mutual assistance is realized, the influence of a construction operation surface is avoided, the construction period can be greatly shortened, and the construction quality is ensured; the utility model has short construction period, reduces the traffic influence on the commercial core area and reduces the occupied road of the project; provide more construction operation faces, guarantee personnel and major structure and form the flowing water, avoid personnel to work too hard.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model; the primary objects and other advantages of the utility model may be realized and attained by the instrumentalities particularly pointed out in the specification.

Drawings

FIG. 1 is a schematic diagram of the construction of a basement roof and the synchronous installation and construction of corridor steel structures;

FIG. 2 is a schematic diagram of the construction of diaphragm wall, engineering pile and stud pile;

FIG. 3 is a schematic diagram of floor casting and corridor structure column pre-construction;

FIG. 4 is a schematic view of the construction of a beam, a slab and a column of a basement, the synchronous dismantling of supports, and the construction of a column top to a designed elevation;

fig. 5 is a schematic diagram of construction of corridor steel structure beam-column plate installation, basement beam-column construction and support synchronous dismantling on the ground.

Reference numerals: 1-engineering pile, 2-basement foundation bottom plate, 3-basement beam slab, 4-ground wall, 5-corridor structural column, 6-corridor, 61-corridor truss column, 62-corridor structural beam slab, 7-upright post independent creeping formwork system, 8-upright post pile, 9-basement beam slab slinging, 10-inner support and 11-basement beam slab elevation.

Detailed Description

A certain financial center project is positioned at a road intersection, is of a frame core tube structure, and is positioned into an urban complex integrating offices, businesses and high-end hotels. The project is in a busy central area and is a main traffic road in an urban area, the traffic flow is large, and underground pipelines are dense. The south tower project and the north tower project are connected into a whole through an underground layer B2-B5 and an overground layer L3-L7, wherein the basement is of a reinforced concrete frame structure, the overground corridor is of a steel structure, and the corridor 6 is supported by eight giant columns. The temporary ground connecting wall 4 is divided into two independent foundation pits, the deepest foundation pit of the south tower reaches 37.4m, and the area of the foundation pit of the south tower is 6940 square meter; the area of the other foundation pit is 4240 square meters, and the safety levels of the two foundation pits are respectively one level.

As described in conjunction with fig. 1 to 5, B1, B2, B3 and B4 represent the elevation 11 of the basement beam slab, and the bottom corresponds to the basement base slab 2; l1 and L2 represent the elevation of each level of vestibule 6. The large-span corridor installation structure in the foundation pit comprises an engineering pile 1 arranged at the bottom of the foundation pit, a basement foundation bottom plate 2 connected to the top of the engineering pile 1, a corridor structure column 5 connected to a basement foundation plate, a ground connection wall 4 connected to the periphery of the foundation pit, basement beam plates 3 connected to the vertical direction of the ground connection wall 4 at intervals and a corridor 6 connected to the top of the corridor structure column 5;

the basement beam plate 3 is arranged corresponding to the basement beam plate elevation 11, and a temporary support is further arranged below the basement beam plate elevation 11; the temporary support comprises an inner support 10 and a vertical column pile 8; the upright pile 8 and the engineering pile 1 are rotary excavating cast-in-place piles. A jig frame is arranged at the position of the basement beam plate 3, and the jig frame is connected with the bracket of the corridor structure column 5 in a welding mode and is connected with the inner support 10 and/or the upright column pile 8 through embedded parts.

In this embodiment, the corridor 6 comprises a steel truss structure and a profiled steel plate structure, and the corridor 6 comprises corridor truss columns 61 and corridor structure beam plates 62 which are arranged horizontally and upwards at intervals; the length of the corridor structure beam plate 62 is larger than that of the foundation pit and is fixedly connected with the built buildings around.

In this embodiment, corridor structure post 5 still can dismantle with the independent creeping formwork system 7 of stand and be connected, and is provided with basement beam slab whipping 9 in 5 vertical upward intervals of corridor structure post, and basement beam slab whipping 9 corresponds basement beam slab 3 and sets up one by one. The corridor structure column 5 is a steel column, and the steel column comprises a square pipe column and a cross steel rib and/or an H-shaped steel rib which are connected inside the square pipe column; the steel column is internally poured with gallery column concrete and is connected with gallery column inner ribs. The square pipe column is horizontally and pre-embedded with an independent column climbing formwork system 7 at intervals, and the independent column climbing formwork system 7 comprises a climbing formwork connecting piece and a climbing formwork platform which are connected with the square pipe column; the creeping formwork platform corresponds the setting around vestibule structure post 5. Correspond vestibule 6 on vestibule structure post 5 and be provided with the pre-buried muscle, pre-buried muscle department is connected with steel bar connector, and steel bar connector outer end just is no less than 15mm at the post limit inboard.

In the embodiment, the joints of the adjacent ground connecting walls 4 are I-shaped steel joints, splicing steel plates of the I-shaped steel joints are welded with the steel bars of the preceding groove sections, and the joint steel bars of the subsequent groove sections stretch into splicing steel plate areas of the joints; square foam and sand bags are filled at the joints, and a grout stopping plate is additionally arranged on the back soil side in the wall.

In this embodiment, creeping formwork platform and protection system all around all are provided with hydraulic protection screen device, and every vestibule structure post 5 sets up one set of independent hydraulic protection screen system.

With reference to fig. 1 to 5, a construction method of a large-span corridor installation structure in a foundation pit is further described, which specifically comprises the following steps:

step one, constructing a ground connecting wall 4, wherein the ground connecting wall 4 is used as a supporting structure and a permanent basement outer wall; the construction mainly comprises guide wall construction, slurry preparation and treatment, continuous wall grooving, reinforcement cage manufacturing and hoisting and concrete pouring; when the joint is processed, the joint reinforcing steel bars are arranged in the subsequent groove section and extend into the splicing steel plate area of the joint, and the waterproof mode adopts internal waterproof;

in the embodiment, when the joint is processed in the first step, the underground diaphragm wall 4 adopts an I-shaped steel joint, a splicing steel plate of the I-shaped steel joint is welded with a steel bar of a previous groove section, and a joint steel bar arranged at a subsequent groove section extends into a splicing steel plate area of the joint; in order to avoid pouring concrete, the concrete bypasses the gap and fills the vacant sites of the groove sections in the second period, square foam and sand bags are adopted at the joints, and meanwhile, a grout stopping plate is additionally arranged on the back soil side in the wall.

And step two, constructing the upright post pile 8 and the engineering pile 1, wherein the upright post pile 8 and the engineering pile 1 are rotary excavating cast-in-place piles, and the upright post pile 8 is constructed on the ground by adopting a pile jumping method. The end of the compression-resistant pile enters a slightly weathered rock bearing stratum by 0.5m, and the end of the uplift pile enters a medium weathered rock bearing stratum by not less than 0.5 m. In addition, when more pipelines exist on site, in order to ensure the safety and smooth pore-forming of the pipelines, an ultra-long protective cylinder can be adopted for auxiliary construction; when the engineering pile 1 enters rock, a special gear drill is adopted to crush the engineering pile, and the engineering pile correspondingly enters slightly weathered granite; and (5) carrying out construction on the piles with the ultra-large diameters by adopting graded rock embedding.

In the embodiment, after the concrete is poured into the pile casing of the cast-in-situ bored pile, the pile casing is pulled out after the last guide pipe is pulled out; the empty pile treatment directly influences the subsequent cast-in-place pile construction, in order to avoid influencing the hole forming of the adjacent cast-in-place pile, 20% cement soil is adopted for backfilling, and the soil can be in-situ undisturbed soil; when the engineering pile 1 is constructed on the ground, earth excavation is carried out subsequently, and 1m of the top of the pile is backfilled by adopting broken stones.

Thirdly, earth excavation construction is carried out, a city center street and/or a road are/is arranged above the excavated area of the earth body, inner supports 10 are fully distributed in the foundation pit, and the support clear distance is small; adopting staged earth excavation and carrying out combined construction through a digging machine and a grab bucket machine; and a drainage ditch is arranged at the periphery of the foundation pit, and surface water flows into the sedimentation tank from the drainage ditch and finally flows into municipal catch basins at the periphery of the ground.

In the third step, the earth excavation is carried out according to the principle that the earth excavation is carried out from top to bottom, symmetrical and uniform and is firstly supported and then excavated according to the comprehensive consideration of the actual plane shape of the foundation pit, the design working condition requirement, the soil layer excavation depth, the surrounding environment, the earth excavation and transportation equipment and the like. Because the foundation ditch is darker, adopt soil excavation stage by stage, the upper strata is lighter, so the first layer earthwork in upper portion adopts the excavator direct excavation, follow-up because of construction operation face is limited, can't set up the ramp in foundation ditch inside, so adopt the cooperation excavator of clamshell machine ZLD100 clamshell machine to carry out the soil excavation construction in foundation ditch shrouding department.

Before the foundation pit is excavated, arrangement of a water supply system, a power supply system, a drainage system, a construction road, an excavation temporary ramp in the foundation pit, an earth outlet, construction facilities, a material yard and the like in a construction area is required according to a construction plane layout. And rechecking the measurement datum line and the leveling point, wherein the datum line and the leveling point are arranged in an area which is not influenced by the excavation of the foundation pit, and paying attention to the protection work in the construction process.

Deep basal pit excavation, during the foundation ditch construction, need set up the escape canal at the foundation ditch periphery, surface water flows into the sedimentation tank from the escape canal, flows into in the peripheral municipal rainwater well in place at last. Meanwhile, in the excavation process of the foundation pit earthwork, the water collecting wells and the water pumps with enough quantity need to be arranged, and the accumulated water can be discharged from the inside of the foundation pit to the outside. When the earth is excavated, the deformation of the foundation pit should be closely monitored, the excavation is immediately stopped when the abnormal deformation condition occurs, the technical units such as monitoring and design and the like share measures, and meanwhile, the sinking and the deformation of adjacent buildings or structures, roads, pipelines and the like should be prevented. And arranging a specially-assigned person to command mechanical operation during excavation.

Step four, the super high-rise building is limited to be in a commercial core area, the construction site of the connecting part of the corridor 6 is narrow, in order to effectively utilize the construction operation space, the inner support 10 is constructed, a part of sealing plates are arranged on the first floor, and an early strength agent is added into the concrete in the construction process of the inner support 10; the inner supports 10 are connected with the underground diaphragm wall 4 through waist beams and are constructed with earthwork construction in an inserting mode, and when earthwork is excavated to the bottom elevation of each inner support 10, construction of the inner supports 10 is started;

and step four, connecting the inner supports 10 with the underground diaphragm wall 4 through the waist beam, and constructing the inner supports 10 in an alternating mode with earthwork construction, wherein when the earthwork is excavated to the bottom elevation of each inner support 10, the construction of the inner supports 10 is started. The excavation of the supporting lower side earthwork can be carried out after the strength of the inner support 10 concrete reaches 80%. After the construction of the structural pile constructed as the vertical support is completed, the upper steel pipe concrete structural column is connected with a horizontal support system in future, and the temporary steel pipe upright column is supported in the horizontal support 10 through a steel supporting plate and an angle iron support.

And fifthly, carrying out the main processes of base plate cleaning, cushion layer pouring, pile foundation detection, pile head treatment, waterproof construction, base plate structure construction and the like according to the foundation plate, wherein the base plate concrete pouring adopts an overhead pump, and large-volume concrete pouring needs to be paid attention to timely cooling and maintenance.

Step six, after the construction of the foundation slab is completed, constructing the corridor structure column 5, the ground steel structure and other structural layer; the corridor structure column 5 is constructed, namely the corridor structure column 5 is inserted for construction after the foundation slab construction is finished, and the corridor structure column 5 is constructed in advance of the underground structure; meanwhile, the corridor structural column 5 is constructed by adopting an upright post independent creeping formwork system 7;

and in the sixth step, the template of the corridor structure column 5 adopts an aluminum film, the overall height is high, in order to maintain the overall stability of the steel skeleton of the structure column, a jig frame is arranged at the supporting height of each foundation pit, and the jig frame is welded with the bracket 5 of the corridor structure column and is connected with the inner support 10 and/or the upright column pile 8 by using an embedded part.

In the embodiment, the corridor structure column 5 is firstly designed with an operation platform required by steel bar binding, template supporting and concrete pouring, and the protection design between the corridor structure column 5 construction and the corridor structure beam plate 62 construction working face; the operation platform and the protection adopt hydraulic protection screen devices, each column is provided with one set of independent hydraulic protection screen system, and work such as reinforcement and formwork erection is facilitated.

In this embodiment, the corridor structural column 5 is a steel column, and the steel column comprises a square pipe column and a cross steel rib and/or an H-shaped steel rib which are connected inside the square pipe column; gallery column concrete and a gallery column inner rib are connected inside the steel column; must set up the anti-overturning measure before the installation of mid portion truss between L3 layer and above each layer skirt house steel column 13 and vestibule structure post 5, and anti-overturning device 12 adopts the vertical setting of the high steel sheet of the 900mm that 25mm is thick, connects skirt house post and vestibule structure post 5 through high steel sheet, transmits horizontal pulling force.

In the embodiment, the square tubular column is horizontally connected with the stand column independent creeping formwork system 7 at intervals in an embedded manner, and the stand column independent creeping formwork system 7 comprises a creeping formwork connecting piece and a creeping formwork platform which are connected with the square tubular column; the creeping formwork platform corresponds the setting around vestibule structure post 5.

Seventhly, when the corridor structural column 5 is constructed in advance, pouring construction is carried out by adopting a tower crane and a hopper; cutting off the longitudinal bars of the concrete structure beams and the column cap reinforcing bars at each underground layer at the sides of the columns to form the beam plate throwing bars 9 of the basement and pre-embed reinforcing bar connectors;

and in the seventh step, the outer ends of all the steel bar connectors are arranged 15mm behind the column edge, and column concrete chiseling is carried out on the positions of the stubbles when the corridor structure beam plate 62 is constructed in the later stage. In addition, because vestibule structure post 5 is higher, in order to guarantee the quality of construction, should strengthen measuring the unwrapping wire, guarantee vestibule structure post 5's straightness that hangs down, and the maintenance of focusing on aluminium membrane and hydraulic pressure protection screen.

Step eight, the corridor 6 adopts a steel truss structure and a profiled steel plate structure, the cross steel rib or H-shaped steel rib and steel structures on two sides of the corridor 6 are firstly installed on the above-ground corridor 6 structure, then a middle truss structure is installed by adopting a jig-free installation method, a bottom truss is installed firstly, then an upper truss structure and corridor truss columns 61 are sequentially installed, the profiled steel plate is installed after the truss structure is installed, a floor slab and a steel bar of the giant column are bound, and the giant column and floor slab concrete are poured until the roof of the coupling beam is capped;

ninth, the underground structure construction mainly comprises basement structure construction, earthwork backfilling and roadbed and pavement construction which are inserted during the construction of the corridor structure column 5; the construction of the plate surface of the underground part structure is to reserve holes and reinforcing steel bars at the crossed part of the underground part structure and the upright post piles 8, construct the basement beam slab 3 from bottom to top, sequentially and alternately remove the inner support 10 and replace the support system after the next layer of basement beam slab 3 is completed; and after all underground structures are constructed, dismantling the upright post piles 8 and filling the reserved holes of the basement.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.

Claims (9)

1. A large-span corridor installation structure in a foundation pit is characterized by comprising an engineering pile (1) arranged at the bottom of the foundation pit, a basement foundation bottom plate (2) connected to the top of the engineering pile (1), a corridor structure column (5) connected to a basement foundation plate, a ground connection wall (4) connected to the periphery of the foundation pit, basement beam plates (3) connected to the vertical direction of the ground connection wall (4) at intervals and a corridor (6) connected to the top of the corridor structure column (5);

the basement beam plate (3) is arranged corresponding to the basement beam plate elevation (11), and a temporary support is further arranged below the basement beam plate elevation (11);

the temporary support comprises an inner support (10) and a stud (8);

corridor structure post (5) still can dismantle with the independent creeping formwork system of stand (7) and be connected, and is provided with basement beam slab at corridor structure post (5) vertical upper interval and gets rid of muscle (9), and basement beam slab gets rid of muscle (9) and corresponds basement beam slab (3) and set up one by one.

2. The large-span corridor installation structure in the foundation pit according to claim 1, wherein the upright pile (8) and the engineering pile (1) are rotary excavating cast-in-place piles, the slightly weathered rock bearing layer at the end of the anti-compression pile in the upright pile (8) is not less than 0.5m, and the weathered rock bearing layer at the end of the anti-pulling pile is not less than 0.5 m; an ultra-long pile casing is arranged on the outer side of the upright post pile (8).

3. The installation structure of the large-span corridor in the foundation pit as claimed in claim 1, wherein the corridor (6) comprises a steel truss structure and a profiled steel plate structure, and the corridor (6) comprises corridor truss columns (61) and corridor structure beam plates (62) which are arranged horizontally and vertically at intervals; the length of the corridor structure beam plate (62) is larger than that of the foundation pit and is fixedly connected with the built buildings around.

4. The installation structure of the large-span vestibule in the foundation pit is characterized in that the joints of the adjacent ground diaphragm walls (4) are I-shaped steel joints, splicing steel plates of the I-shaped steel joints are welded with the steel bars of the previous groove sections, and the steel bars of the joints arranged in the subsequent groove sections extend into the splicing steel plate areas of the joints; square foam and sand bags are filled at the joints, and a grout stopping plate is additionally arranged on the back soil side in the wall.

5. The installation structure of the large-span corridor in the foundation pit is characterized in that a jig frame is arranged at the position of the basement beam plate (3), and the jig frame is connected with a bracket of the corridor structure column (5) in a welding mode and connected with the inner support (10) and/or the upright column pile (8) through embedded parts.

6. The large-span vestibule installation structure in a foundation pit as claimed in claim 1, characterized in that the vestibule structure column (5) is a steel column, and the steel column comprises a square pipe column, a cross steel rib and/or an H-shaped steel rib connected inside the square pipe column; the steel column is internally poured with gallery column concrete and is connected with gallery column inner ribs.

7. The installation structure of the large-span corridor in the foundation pit according to claim 6, wherein an independent climbing formwork system (7) of the upright column is connected on the square column horizontally in an embedded mode at intervals, and the independent climbing formwork system (7) of the upright column comprises a climbing formwork connecting piece and a climbing formwork platform which are connected with the square column; the creeping formwork platform is correspondingly arranged around the corridor structure column (5).

8. The installation structure of the large-span vestibule in the foundation pit as claimed in claim 7, characterized in that the creeping formwork platform and the surrounding protection system are provided with hydraulic protection screen devices, and each vestibule structure column (5) is provided with an independent hydraulic protection screen system.

9. The installation structure of the large-span vestibule in the foundation pit according to claim 1, characterized in that the vestibule structure column (5) is provided with pre-embedded ribs corresponding to the vestibule (6), the pre-embedded ribs are connected with steel bar connectors, and the outer ends of the steel bar connectors are arranged on the inner side of the column edge and are not less than 15 mm.

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