1. The utility model provides a pre-buried formula subway station frame construction, characterized by includes:

a caisson assembly, a bottom caisson, a top caisson, and a middle caisson; the bottom caisson is positioned at the bottom of the foundation pit and is tightly attached to the side wall, the middle caisson and the top caisson are tightly attached to the side wall and are arranged above the bottom caisson through floating columns, the floating columns penetrate through the bottom caisson, the top caisson and the middle caisson and are fixed, and ramming soil layers are filled among the bottom caisson, the top caisson and the middle caisson;

the side wall plate assembly comprises split side plates and a partition plate;

the split side plates comprise a bottom side plate and a middle side plate; the bottom side plate is vertically connected with an end valve plate, the side surface of the end valve plate is fixed on the bottom caisson through a connecting rib, the bottom side plate is connected to the bottommost middle caisson through a connecting rib, and the middle side plate is connected to the side walls of the other middle caissons; the side of the bottom side plate and the side of the middle side plate, which faces away from the side wall, are provided with extrusion surfaces, the extrusion surfaces are of an inclined structure relative to a horizontal line, wherein the inclination angle is alpha, and alpha is more than 90 degrees and less than 180 degrees; the isolation plate comprises contact surfaces which are used for being in contact with the surfaces of the bottom side plate and the middle side plate, the contact surfaces are tightly attached to the extrusion surface, and the outer side of the isolation plate is an inner wall fixing surface; the support frame assembly comprises an end connecting box, an end floating beam, a split cross beam and a support column; wherein, an extension part extending towards the outer side of the foundation pit is arranged on the top caisson, and the end connecting box is fixed at the top end of the extension part; the end floating beam comprises a floating connecting part, the floating connecting part is vertically connected with a split beam connecting part, a floating hole penetrates through the floating connecting part, the floating hole is of a blind hole structure, the top end of the floating column penetrates into the floating hole, and elastic media are filled between the end of the floating column and the end of the floating hole; the side wall of the end connecting box is in floating connection with the floating connecting part of the end floating beam, and the split beam is fixed on the split beam connecting part through a flange; a split vertical beam is fixed on part of the split cross beam; the support column is fixed on the split vertical beam through a flange, and the bottom end of the support column is inserted into the bottom of the foundation pit;

the valve plate assembly comprises a plurality of valve plate boxes, the valve plate boxes are welded and fixed at the bottom ends of the supporting columns, and the bottoms of the valve plate boxes are in contact with the bottom of the foundation pit; the valve plate box is internally provided with a reinforced concrete structure, adjacent valve plate boxes are mutually connected through reinforcing steel bars, and the valve plate box positioned on the outer side of the foundation pit is connected onto the end valve plate through the reinforcing steel bars.

2. The pre-buried subway station frame structure as claimed in claim 1, wherein: the inner wall fixing surface is perpendicular to the horizontal line, wherein reinforced concrete is arranged between the inner wall fixing surface and the contact surface, and the reinforcing steel bars are welded and fixed with the inner wall fixing surface and the contact surface.

3. The pre-buried subway station frame structure as claimed in claim 1, wherein: one side of the end part connecting box facing the inside of the foundation pit is provided with a floating contact end A, the side wall of the floating connecting part of the end part floating beam is provided with a floating contact end B, and the floating contact end A and the floating contact end B are fixedly connected through a damping cushion block A.

4. The pre-buried subway station frame structure as claimed in claim 1, wherein: the valve plate box is characterized by further comprising a concrete assembly, wherein the concrete assembly comprises side walls, a top plate, a top wall, a main body column and a bottom plate, the bottom plate is poured on the upper portion of each valve plate box, and the top plate is integrally poured with the end connecting box, the end floating beam and the split cross beam through a steel bar structure; and a top wall is poured below the top plate, and the side wall is arranged between the inner wall fixing surface of the isolation plate and the corresponding top wall and the bottom plate.

5. The pre-buried subway station frame structure as claimed in claim 1, wherein: the blind end of the floating hole of the floating connecting part is also provided with an observation hole, the top end of the floating beam is coaxially fixed with an observation rod inserted into the observation hole, the end part of the observation rod is provided with an observation block, and the end part of the observation rod is exposed out of the ground.

6. The pre-buried subway station frame structure as claimed in claim 1, wherein: the end floating beam comprises an end connecting end in floating connection with the end connecting box and a split connecting end fixedly connected with the split cross beam; the end connecting end and the split connecting end are connected in a sliding mode through the sliding rod, the two ends of the floating column are coaxially inserted into the end connecting end and the split connecting end respectively, the shock absorption cushion block B is coaxially sleeved on the sliding column, and the end connecting end and the split connecting end are tightly pressed on the two sides of the shock absorption cushion block B.

7. The pre-buried subway station frame structure as claimed in claim 1, wherein: the bottom caisson, the top caisson and the middle caisson are all of hollow structures, floating column connecting holes are preset in the side walls of the bottom caisson, the top caisson and the middle caisson, and concrete is filled in the bottom caisson, the top caisson and the middle caisson.

8. The construction method of the pre-buried subway station frame structure as claimed in claim 1, characterized by comprising the steps of:

excavating and backfilling foundation pits of side walls, excavating and backfilling the foundation pits at the positions of the side walls in sequence, excavating caisson grooves at the positions, corresponding to the positions of the side walls, of the foundation pits of a station of a subway, firstly placing bottom caissons in the grooves, fixing floating columns on the bottom caissons through concrete, then placing first middle caissons, backfilling partial soil and tamping, then placing the rest of middle caissons in sequence, combining the middle caissons to the floating columns, and finally placing top caissons;

after the foundation pit of each side wall is backfilled, piling at the position corresponding to the support column in the foundation pit, pressing the support column into the bottom of the foundation pit, excavating the earth surface at the position of the foundation pit after the support column is pressed and mounted, connecting an end part connecting box on a top caisson through a flange, then connecting end part floating beams on the side walls of the end part connecting boxes through damping cushion blocks A, connecting split cross beams between the end part floating beams connected on each top caisson to realize the assembly of a top end frame, and fixedly connecting part of a three-way pipe of each split cross beam with the top ends of the support columns after the assembly of the top end frame is finished;

excavating a foundation pit main body, excavating from the side wall to the middle part, welding a bottom side plate and an end valve plate which are integrated into a whole on a bottom caisson and a first middle caisson at the bottom through reinforcing steel bars in the process of excavating the foundation pit at the position of the side wall, and connecting the middle side plates on the other middle caissons through reinforcing steel bars;

after the excavation of foundation ditch is accomplished, curb plate in the middle of, place the division board on the side wall bearing structure that the bottom curb plate constitutes, the while corresponds the position installation steel bar structure's of foundation ditch bottom at the support column valve plate case, utilize the reinforcing bar to be connected each valve plate case and tip valve plate simultaneously, connect the concrete grout who at first carries out the bottom after accomplishing and make the bottom plate, carry out the concrete grout on the division board surface afterwards and make the side wall, carry out the top and arrange top steel bar structure afterwards, top steel bar structure connects between the components of a whole that can function independently crossbeam, to steel bar structure and end connection case, the tip floating beam, components of a whole that can function independently crossbeam is pour and is formed the roof, the roof is accomplished the back, set up integrative interior steel bar structure below support column and roof, integrative main part post and top wall are pour out to an organic whole.

Background

Excavation of a subway station is generally carried out by firstly excavating a foundation pit, then arranging steel structure baffles on the side wall surface of the foundation pit, and connecting cross beams between the steel structure baffles through flanges to realize transverse support of the baffles so as to prevent collapse of the side wall of the foundation pit; although the steel structure can support the foundation pit, after the foundation pit is excavated and before the steel structure is placed, local collapse of the foundation pit or local slippage of soil still easily exists; although the existing novel buildings are all integral steel structure buildings, the structure of a foundation pit matched with a valve plate is utilized; however, the existing traditional brick-concrete house is more in the subway excavation line, and the foundation is only of a pile structure, so that the condition that the ground pile is bent or the building is locally settled due to the slippage of the foundation soil is easily caused when the foundation pit is excavated, and further the cracking of the building near the foundation pit is caused, and the living safety is influenced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the technical problem that the surrounding buildings are prone to cracking due to a foundation pit excavation process in the prior art is solved, and the pre-buried subway station frame structure is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a pre-buried formula subway station frame construction includes:

a caisson assembly, a bottom caisson, a top caisson, and a middle caisson; the bottom caisson is positioned at the bottom of the foundation pit and is tightly attached to the side wall, the middle caisson and the top caisson are tightly attached to the side wall and are arranged above the bottom caisson through floating columns, the floating columns penetrate through the bottom caisson, the top caisson and the middle caisson and are fixed, and ramming soil layers are filled among the bottom caisson, the top caisson and the middle caisson;

the side wall plate assembly comprises split side plates and a partition plate;

the split side plates comprise a bottom side plate and a middle side plate; the bottom side plate is vertically connected with an end valve plate, the side surface of the end valve plate is fixed on the bottom caisson through a connecting rib, the bottom side plate is connected to the bottommost middle caisson through a connecting rib, and the middle side plate is connected to the side walls of the other middle caissons; the side of the bottom side plate and the side of the middle side plate, which faces away from the side wall, are provided with extrusion surfaces, the extrusion surfaces are of an inclined structure relative to a horizontal line, wherein the inclination angle is alpha, and alpha is more than 90 degrees and less than 180 degrees; the isolation plate comprises contact surfaces which are used for being in contact with the surfaces of the bottom side plate and the middle side plate, the contact surfaces are tightly attached to the extrusion surface, and the outer side of the isolation plate is an inner wall fixing surface;

the support frame assembly comprises an end connecting box, an end floating beam, a split cross beam and a support column; wherein, an extension part extending towards the outer side of the foundation pit is arranged on the top caisson, and the end connecting box is fixed at the top end of the extension part; the end floating beam comprises a floating connecting part, the floating connecting part is vertically connected with a split beam connecting part, a floating hole penetrates through the floating connecting part, the floating hole is of a blind hole structure, the top end of the floating column penetrates into the floating hole, and elastic media are filled between the end of the floating column and the end of the floating hole; the side wall of the end connecting box is in floating connection with the floating connecting part of the end floating beam, and the split beam is fixed on the split beam connecting part through a flange; a split vertical beam is fixed on part of the split cross beam; the support column is fixed on the split vertical beam through a flange, and the bottom end of the support column is inserted into the bottom of the foundation pit;

the valve plate assembly comprises a plurality of valve plate boxes, the valve plate boxes are welded and fixed at the bottom ends of the supporting columns, and the bottoms of the valve plate boxes are in contact with the bottom of the foundation pit; the valve plate box is internally provided with a reinforced concrete structure, adjacent valve plate boxes are mutually connected through reinforcing steel bars, and the valve plate box positioned on the outer side of the foundation pit is connected onto the end valve plate through the reinforcing steel bars.

As a further improvement of the invention, the inner wall fixing surface is arranged perpendicular to the horizontal line, wherein reinforced concrete is arranged between the inner wall fixing surface and the contact surface, and the reinforcing steel bars are welded and fixed with the inner wall fixing surface and the contact surface; welded fastening can promote the joint strength of interior wall, prevents that the division board from taking place the separation because sink with the interior wall, leads to the stability variation of interior wall.

As a further improvement of the invention, one side of the end part connecting box facing the inside of the foundation pit is provided with a floating contact end A, the side wall of the floating connecting part of the end part floating beam is provided with a floating contact end B, and the floating contact end A and the floating contact end B are fixedly connected through a damping cushion block A; the connection of floating is carried out through the cushion blocks, so that the influence of the foundation pit side wall structure sinking or local vibration on the station inner wall can be prevented.

As a further improvement of the invention, the invention also comprises a concrete component, wherein the concrete component comprises side walls, a top plate, a top wall, a main body column and a bottom plate, wherein the bottom plate is poured on the upper part of each valve plate box, and the top plate is integrally poured with the end connecting box, the end floating beam and the split cross beam through a steel bar structure; and a top wall is poured below the top plate, and the side wall is arranged between the inner wall fixing surface of the isolation plate and the corresponding top wall and the bottom plate.

As a further improvement of the invention, an observation hole is arranged at the blind end of the floating hole of the floating connecting part, an observation rod inserted into the observation hole is coaxially fixed at the top end of the floating beam, an observation block is arranged at the end part of the observation rod, and the end part of the observation rod is exposed out of the ground; the observation hole can realize the observation of the floating column, namely the sinkage amount of each caisson, so as to make early warning in advance.

As a further improvement of the invention, the end floating beam comprises an end connecting end in floating connection with the end connecting box and a split connecting end fixedly connected with the split cross beam; the end connecting end and the split connecting end are connected in a sliding mode through a sliding rod, two ends of the floating column are respectively inserted into the end connecting end and the split connecting end in a coaxial mode, the sliding column is sleeved with a damping cushion block B in a coaxial mode, and the end connecting end and the split connecting end are tightly pressed on two sides of the damping cushion block B; the edge of the beam structure is designed into a damping floating structure, so that the influence of the ground impact on the upper part of the subway station on the inner wall of the subway station can be reduced.

As a further improvement of the invention, the bottom caisson, the top caisson and the middle caisson are all hollow structures, floating column connecting holes are preset in the side walls of the bottom caisson, the top caisson and the middle caisson, and concrete is filled in the bottom caisson, the top caisson and the middle caisson; the caisson adopts the back grout structure, can reduce the caisson dead weight when the caisson is installed, utilizes the concrete to promote intensity after the installation.

The construction method of the pre-buried subway station frame structure comprises the following steps:

excavating and backfilling foundation pits of side walls, excavating and backfilling the foundation pits at the positions of the side walls in sequence, excavating caisson grooves at the positions, corresponding to the positions of the side walls, of the foundation pits of a station of a subway, firstly placing bottom caissons in the grooves, fixing floating columns on the bottom caissons through concrete, then placing first middle caissons, backfilling partial soil and tamping, then placing the rest of middle caissons in sequence, combining the middle caissons to the floating columns, and finally placing top caissons;

after the foundation pit of each side wall is backfilled, piling at the position corresponding to the support column in the foundation pit, pressing the support column into the bottom of the foundation pit, excavating the earth surface at the position of the foundation pit after the support column is pressed and mounted, connecting an end part connecting box on a top caisson through a flange, then connecting end part floating beams on the side walls of the end part connecting boxes through damping cushion blocks A, connecting split cross beams between the end part floating beams connected on each top caisson to realize the assembly of a top end frame, and fixedly connecting part of a three-way pipe of each split cross beam with the top ends of the support columns after the assembly of the top end frame is finished;

excavating a foundation pit main body, excavating from the side wall to the middle part, welding a bottom side plate and an end valve plate which are integrated into a whole on a bottom caisson and a first middle caisson at the bottom through reinforcing steel bars in the process of excavating the foundation pit at the position of the side wall, and connecting the middle side plates on the other middle caissons through reinforcing steel bars;

after the excavation of foundation ditch is accomplished, curb plate in the middle of, place the division board on the side wall bearing structure that the bottom curb plate constitutes, the while corresponds the position installation steel bar structure's of foundation ditch bottom at the support column valve plate case, utilize the reinforcing bar to be connected each valve plate case and tip valve plate simultaneously, connect the concrete grout who at first carries out the bottom after accomplishing and make the bottom plate, carry out the concrete grout on the division board surface afterwards and make the side wall, carry out the top and arrange top steel bar structure afterwards, top steel bar structure connects between the components of a whole that can function independently crossbeam, to steel bar structure and end connection case, the tip floating beam, components of a whole that can function independently crossbeam is pour and is formed the roof, the roof is accomplished the back, set up integrative interior steel bar structure below support column and roof, integrative main part post and top wall are pour out to an organic whole.

The invention has the beneficial effects that:

1. according to the invention, firstly, the problem of damage to surrounding buildings caused by soil sliding due to large-range foundation pit excavation can be reduced by small-range excavation of the foundation pit; meanwhile, the arrangement of the caisson, the floating column and the rammed earth can realize the layout of the supporting fence around the foundation pit by smaller excavation in advance so as to eliminate the slip of the soil on the side wall of the foundation pit during the later excavation of the whole foundation pit; the cross beam with the prearranged top end can place the slippage of the side wall of the foundation pit after the foundation pit is finished; after the whole underground building is completed, the caisson can provide sliding friction force and bonding strength of the extra side wall and the inner wall surface of the foundation pit; the extrusion surface arranged at the side end of the caisson and the contact surface of the isolation plate are of an inclined structure, when the subway station structure in the foundation pit partially sinks, extrusion support for the side wall of the subway station in the vertical direction can be provided through relative extrusion of the extrusion surface and the contact surface, and when the subway station structure integrally sinks, extrusion force can be provided for a cross beam with more stable structural strength through extrusion of the station, so that the service life of the whole building is prolonged; when relative sliding occurs between the top cross beam frame integrated with the whole concrete structure of the station and the caisson integrated with the side wall of the foundation pit, the moving amount of the floating column relative to the top cross beam frame can be observed through the observation hole, so that the jacking structure of the supporting column can be adjusted.

2. The construction process can reduce the strength of the word excavation foundation pit, simultaneously, the caisson is embedded in real time, and rammed earth is backfilled, so that the damage of surrounding soil layer structures caused by excavation of the foundation pit in a large range can be prevented, and further the sinking and the damage of surrounding buildings can be prevented.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a partial cross-sectional schematic view of an intermediate settlement.

In the figure: 1. a middle caisson; 2. a bottom caisson; 3. an inner cavity of the caisson; 4. a top caisson; 5. a floating column; 6. an extension portion; 7. the end part is connected with the box; 8. a floating contact end A; 9. a floating contact end B; 10. a damping cushion block A; 11. an end floating beam; 12. a floating hole; 13. an observation hole; 14. an observation rod; 15. an observation block; 16. an end connection end; 17. a split connecting end; 18. a slide bar; 19. a damping cushion block B; 20. a split beam; 21. a flange; 22. a three-way pipe; 23. a support pillar; 24. an end valve plate; 25. a bottom side plate; 26. a middle side plate; 27. a separator plate; 28. a contact surface; 29. tamping a soil layer; 30. a valve plate box; 31. a steel bar structure; 32. a base plate; 33. a side wall; 34. a main body column; 35. a top plate; 36. a top wall; 37. an extension ear; 38. the floating column is connected to the hole.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, the present invention is a pre-buried subway station frame structure, including:

a caisson assembly, a bottom caisson, a top caisson, and a middle caisson; the bottom caisson is positioned at the bottom of the foundation pit and is tightly attached to the side wall, the middle caisson and the top caisson are tightly attached to the side wall and are arranged above the bottom caisson through floating columns, the floating columns penetrate through the bottom caisson, the top caisson and the middle caisson and are fixed, and ramming soil layers are filled among the bottom caisson, the top caisson and the middle caisson;

the side wall plate assembly comprises split side plates and a partition plate;

the split side plates comprise a bottom side plate and a middle side plate; the bottom side plate is vertically connected with an end valve plate, the side surface of the end valve plate is fixed on the bottom caisson through a connecting rib, the bottom side plate is connected to the bottommost middle caisson through a connecting rib, and the middle side plate is connected to the side walls of the other middle caissons; the side of the bottom side plate and the side of the middle side plate, which faces away from the side wall, are provided with extrusion surfaces, the extrusion surfaces are of an inclined structure relative to a horizontal line, wherein the inclination angle is alpha, and alpha is more than 90 degrees and less than 180 degrees; the isolation plate comprises contact surfaces which are used for being in contact with the surfaces of the bottom side plate and the middle side plate, the contact surfaces are tightly attached to the extrusion surface, and the outer side of the isolation plate is an inner wall fixing surface;

the support frame assembly comprises an end connecting box, an end floating beam, a split cross beam and a support column; wherein, an extension part extending towards the outer side of the foundation pit is arranged on the top caisson, and the end connecting box is fixed at the top end of the extension part; the end floating beam comprises a floating connecting part, the floating connecting part is vertically connected with a split beam connecting part, a floating hole penetrates through the floating connecting part, the floating hole is of a blind hole structure, the top end of the floating column penetrates into the floating hole, and elastic media are filled between the end of the floating column and the end of the floating hole; the side wall of the end connecting box is in floating connection with the floating connecting part of the end floating beam, and the split beam is fixed on the split beam connecting part through a flange; a split vertical beam is fixed on part of the split cross beam; the support column is fixed on the split vertical beam through a flange, and the bottom end of the support column is inserted into the bottom of the foundation pit;

the valve plate assembly comprises a plurality of valve plate boxes, the valve plate boxes are welded and fixed at the bottom ends of the supporting columns, and the bottoms of the valve plate boxes are in contact with the bottom of the foundation pit; the valve plate box is internally provided with a reinforced concrete structure, adjacent valve plate boxes are mutually connected through reinforcing steel bars, and the valve plate box positioned on the outer side of the foundation pit is connected onto the end valve plate through the reinforcing steel bars.

Furthermore, the inner wall fixing surface is perpendicular to the horizontal line, wherein reinforced concrete is arranged between the inner wall fixing surface and the contact surface, and the steel bars are welded and fixed with the inner wall fixing surface and the contact surface.

Furthermore, one side, facing the inside of the foundation pit, of the end part connecting box is provided with a floating contact end A, the side wall of the floating connecting part of the end part floating beam is provided with a floating contact end B, and the floating contact end A and the floating contact end B are fixedly connected through a damping cushion block A.

The valve plate box is characterized by further comprising a concrete assembly, wherein the concrete assembly comprises side walls, a top plate, a top wall, a main body column and a bottom plate, the bottom plate is poured on the upper portion of each valve plate box, and the top plate is integrally poured with the end connecting box, the end floating beam and the split cross beam through a steel bar structure; and a top wall is poured below the top plate, and the side wall is arranged between the inner wall fixing surface of the isolation plate and the corresponding top wall and the bottom plate.

Furthermore, an observation hole is formed in the blind end of the floating hole of the floating connecting portion, an observation rod inserted into the observation hole is coaxially fixed to the top end of the floating beam, an observation block is arranged at the end portion of the observation rod, and the end portion of the observation rod is exposed out of the ground.

Furthermore, the end floating beam comprises an end connecting end in floating connection with the end connecting box and a split connecting end fixedly connected with the split cross beam; the end connecting end and the split connecting end are connected in a sliding mode through the sliding rod, the two ends of the floating column are coaxially inserted into the end connecting end and the split connecting end respectively, the shock absorption cushion block B is coaxially sleeved on the sliding column, and the end connecting end and the split connecting end are tightly pressed on the two sides of the shock absorption cushion block B.

As shown in fig. 2, further, the bottom caisson, the top caisson and the middle caisson are all hollow structures, floating column connection holes are preset in the side walls of the bottom caisson, the top caisson and the middle caisson, and concrete is filled in the bottom caisson, the top caisson and the middle caisson; in order to improve the strength, the surfaces of the bottom caisson, the top caisson and the middle caisson are provided with extension lugs made of steel bars.

The construction method of the pre-buried subway station frame structure comprises the following steps:

excavating and backfilling foundation pits of side walls, excavating and backfilling the foundation pits at the positions of the side walls in sequence, excavating caisson grooves at the positions, corresponding to the positions of the side walls, of the foundation pits of a station of a subway, firstly placing bottom caissons in the grooves, fixing floating columns on the bottom caissons through concrete, then placing first middle caissons, backfilling partial soil and tamping, then placing the rest of middle caissons in sequence, combining the middle caissons to the floating columns, and finally placing top caissons;

after the foundation pit of each side wall is backfilled, piling at the position corresponding to the support column in the foundation pit, pressing the support column into the bottom of the foundation pit, excavating the earth surface at the position of the foundation pit after the support column is pressed and mounted, connecting an end part connecting box on a top caisson through a flange, then connecting end part floating beams on the side walls of the end part connecting boxes through damping cushion blocks A, connecting split cross beams between the end part floating beams connected on each top caisson to realize the assembly of a top end frame, and fixedly connecting part of a three-way pipe of each split cross beam with the top ends of the support columns after the assembly of the top end frame is finished;

excavating a foundation pit main body, excavating from the side wall to the middle part, welding a bottom side plate and an end valve plate which are integrated into a whole on a bottom caisson and a first middle caisson at the bottom through reinforcing steel bars in the process of excavating the foundation pit at the position of the side wall, and connecting the middle side plates on the other middle caissons through reinforcing steel bars;

after excavation of a foundation pit is completed, a partition plate is placed on a side wall supporting structure formed by a middle side plate and a bottom side plate, a valve plate box with a steel bar structure is installed at a position, corresponding to the bottom of the foundation pit, of a supporting column, steel bars are used for connecting each valve plate box with an end valve plate, after connection is completed, concrete grouting at the bottom is firstly carried out to manufacture a bottom plate, then concrete grouting is carried out on the surface of the partition plate to manufacture a side wall, a top steel bar structure is arranged at the top end, the top steel bar structure is connected between split cross beams, the steel bar structure and an end connecting box, an end floating beam and the split cross beams are integrally poured to form a top plate, after the top plate is completed, an integrated inner steel bar structure is arranged below the supporting column and the top plate, and a main body column and a top wall are integrally poured;

because the top plate and the ground are of an integrated fixed structure, asynchronous sinking or vibration can occur to the subway station and each caisson, when the subway station sinks as a whole, because the caisson is combined and fixed with the soil layer through the ramming soil layer, therefore, when the subway concrete structure sinks, the side plate structures on each caisson are extruded through the isolation plates, the isolation plate is extruded by the side plate through the inclined surface, the extrusion stress is transmitted to the floating shock-absorbing cushion block A and the shock-absorbing cushion block B through the end connecting box at the upper part of the top caisson, and then transmitted to the beam structure with larger structural strength to disperse the extrusion stress, and meanwhile, the counter acting force of the beam can provide the supporting force for the isolation plate, therefore, the caisson can prevent the concrete structure of the subway station from sinking, and simultaneously provides the friction force and the buoyancy force of the side wall of the foundation pit of the subway station; in addition, because the side plates of the caisson are in local sliding contact with the isolation plates and are matched with the damping cushion blocks with the beam structures, the transmission of the land vibration to the subway station or the transmission of the subway station vibration to the edge soil layer can be reduced when the subway runs; when the station subsides, the concrete layer on subway station upper portion can move with the difference between the integrative unsteady post of caisson, and the amount of movement then can embody through the removal of observation pole, and the removal of observation pole then can realize detecting through measuring the drop of observing the relative ground of piece.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.