CN110042863B - Full-composite assembled subway station underground wall and prefabricated middle plate node and construction method - Google Patents

Abstract

The invention discloses a full-composite assembled subway station underground wall and prefabricated middle plate node structure, wherein: comprises an underground wall, a steel structure clamping groove and a prefabricated middle plate; the underground wall is pre-embedded with a steel structure clamping groove; the steel structure clamping groove is U-shaped as a whole, a lower wing plate is provided with a lower clamping groove in advance, and an upper clamping groove is provided at a corresponding position below the prefabricated middle plate in advance; a sliding lifting device is arranged in a gap formed by the lower clamping groove and the upper clamping groove, and can support and lift the prefabricated middle plate and drive the prefabricated middle plate to longitudinally move along the subway station; a plurality of steel bar connectors are fixed above the upper wing plate and below the lower clamping groove of the lower wing plate and are respectively connected with the underground wall longitudinal bars in the underground wall in a matching way. The invention solves the problem of hoisting errors of the prefabricated underground wall and ensures that the prefabricated middle plate can be accurately positioned; the connection of the longitudinal steel bars of the underground wall can be realized by utilizing the rigidity of the connector and the reserved steel bars, so that the prefabricated underground wall is prevented from weakening and damaging.

Description

Full-composite assembled subway station underground wall and prefabricated middle plate node and construction method

Technical Field

The invention belongs to the field of underground engineering, in particular to a subway station, and particularly relates to a full-composite assembled subway station underground wall and prefabricated middle plate node structure.

Background

The existing underground structural engineering such as subway station structure has two structural forms, namely an assembled underground structure and a full open cut cast-in-situ underground structure, but has respective defects. In order to overcome the problems, a fully composite assembled subway station structure is developed.

However, the following problems exist in the construction process of the fully-composite assembled subway station:

(1) The elevation is accurate in assembly type underground wall hoisting difficulty, if the steel bar connector is reserved in the assembly type underground wall, the steel bar connector cannot be used due to the fact that deviation exists in the hoisting process, and the middle plate cannot be connected with the underground wall.

(2) The groove is reserved on the prefabricated underground wall simply, the difficult problem that accurate positioning is difficult to achieve exists, the groove is inaccurate in position, trimming or correction is needed before the middle plate is installed, and time and labor are wasted. Meanwhile, only the reserved grooves can further cause the longitudinal ribs of the underground wall to be cut off, so that the strength of the underground wall is weakened, and weak points are formed.

(3) In the construction process of the fully-composite assembled reverse construction subway station, the station roof longitudinal beam and the roof are firstly hoisted and completed, then the middle longitudinal beam is completed by adopting a cast-in-situ or splicing method, and then the prefabricated middle plate is hoisted. The prefabricated middle plate is hung in from the working well and can be assembled after a series of horizontal and vertical movements, and a good solution is not found at present.

(4) According to calculation, the weight of the single prefabricated middle plate exceeds 10t, the internal space of the station is narrow, and the horizontal transportation and assembly of the prefabricated middle plate are difficult to realize by the existing mechanical trolley. The novel mechanical trolley has long period and high cost.

(5) The prefabricated parts are transported and assembled by mechanical equipment, the requirement on the flatness of the ground is high, the prefabricated parts caused by uneven ground collide with the existing parts to be damaged greatly, and the soil body of the station is usually soft, so that the use of the mechanical trolley is limited.

In summary, the key technologies to be solved by the fully-composite assembled subway station include:

(1) Accurate butt joint of the assembled underground wall and the prefabricated middle plate;

(2) In the fully-composite assembled reverse construction subway station, the horizontal transportation and assembly of the prefabricated middle plate are carried out.

Disclosure of Invention

Aiming at least one of the defects or the improvement demands of the prior art, the invention provides a node structure of the underground wall and the prefabricated middle plate of the fully-composite assembled subway station, solves the problem of hoisting errors of the prefabricated underground wall, and ensures that the prefabricated middle plate can be accurately positioned; the connection of the longitudinal steel bars of the underground wall can be realized by utilizing the rigidity of the connector and the reserved steel bars, so that the prefabricated underground wall is prevented from being weakened and damaged; meanwhile, the node is simple in structure, convenient to apply and high in reliability.

In order to achieve the above object, according to one aspect of the present invention, there is provided a node structure of an underground wall and a prefabricated middle plate of a fully composite assembled subway station, wherein: comprises an underground wall, a steel structure clamping groove and a prefabricated middle plate;

The steel structure clamping groove is pre-buried in the center elevation position of the middle plate of the underground wall to form a groove which is opened into the subway station and longitudinally extends along the subway station, and the height of the groove is larger than the thickness of the prefabricated middle plate;

the steel structure clamping groove is U-shaped and comprises an upper wing plate, a web plate and a lower wing plate;

The lower wing plate is provided with a lower clamping groove which is concave downwards and extends longitudinally along the subway station in advance, and an upper clamping groove which is concave upwards and extends longitudinally along the subway station is arranged at a corresponding position below the prefabricated middle plate in advance; a sliding lifting device is arranged in a gap formed by the lower clamping groove and the upper clamping groove, and can support and lift the prefabricated middle plate and drive the prefabricated middle plate to longitudinally move along the subway station;

a plurality of steel bar connectors are fixed above the upper wing plate and below the lower clamping groove of the lower wing plate, and are respectively connected with the underground wall longitudinal bars in the underground wall in a matching way.

Preferably, the sliding lifting device comprises a sliding jack, wherein the sliding jack comprises a jack, a steel plate and a roller;

the bottom of the jack is fixed on the steel plate and used for supporting the lifting prefabricated middle plate; a plurality of rollers are arranged below the steel plate and used for rolling and walking in the lower clamping groove.

Preferably, the sliding lifting device comprises a traction device, wherein the traction device comprises steel strands, steel bars and a hoisting mechanism;

a plurality of sliding jacks in the lower clamping groove form a group of sliding jack groups for jointly transporting a prefabricated middle plate, the sliding jacks are fixedly connected with one another through steel bars, and the sliding jacks at two ends of each group are respectively connected with a hoisting mechanism at the starting end and the finishing end through steel strands and used for traction of the sliding jack groups.

Preferably, the hoisting mechanism at the terminal end is an electric hoist; the hoisting mechanism at the starting end is an electric hoist or a hand wheel, or the parallel combination of the electric hoist and the hand wheel is used for alternative use.

In order to achieve the above object, according to another aspect of the present invention, there is also provided a construction method of the above-mentioned all-composite assembled subway station underground wall and prefabricated middle plate node structure, comprising the steps of:

S1, binding longitudinal ribs of an underground wall at a prefabrication factory, placing steel structure clamping grooves at elevation positions of a prefabrication middle plate, and connecting the longitudinal ribs of the underground wall with a steel bar connector above an upper wing plate and below a lower clamping groove of a lower wing plate;

S2, pouring concrete to form a prefabricated underground continuous wall, wherein a groove and a lower clamping groove are formed in the prefabricated underground wall at the clamping groove of the steel structure, and the prefabricated underground wall is hoisted to the corresponding elevation in a framing manner;

S3, installing the prefabricated middle plate in the groove, installing a sliding lifting device in the lower clamping groove, and sequentially transporting the prefabricated middle plate to a preset installation position longitudinally and horizontally through the sliding lifting device.

Preferably, the other end of the prefabricated middle plate is pre-provided with an upper clamping groove which is the same as the end of the underground wall; the prefabricated middle longitudinal beam at the other side of the prefabricated middle plate is provided with a reserved protruding tongue-and-groove which is the same as that in the underground wall, and the lower tongue-and-groove is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate in through a working well, placing the prefabricated middle plate above a steel structure clamping groove pre-buried in the underground wall and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam, and aligning the upper clamping groove with the lower clamping groove; the lower clamping grooves at two sides are respectively provided with a sliding lifting device;

S32, sliding and adjusting the longitudinal position of the sliding lifting device to enable the sliding lifting device to be located under the upper clamping groove of the prefabricated middle plate and in a contracted state;

S33, simultaneously lifting the sliding lifting devices on two sides to the same height, and supporting the prefabricated middle plate to separate from the underground wall and the prefabricated middle longitudinal beam;

s34, simultaneously longitudinally sliding the sliding lifting devices on two sides to transport the prefabricated middle plate to a preset installation position;

S35, simultaneously lowering the sliding lifting devices on two sides, putting down the prefabricated middle plate, and supporting the prefabricated middle plate above a steel structure clamping groove pre-embedded in the underground wall and a reserved protruding tongue-and-groove of a prefabricated middle longitudinal beam to finish the transportation and installation of the single prefabricated middle plate;

S36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates.

Preferably, the method further comprises the steps of:

s4, after each prefabricated middle plate is assembled, on one hand, the sliding lifting device is moved out from the terminal end, and on the other hand, a plurality of height-adjusting clamping cushion blocks are sequentially inserted into gaps between the upper clamping grooves and the lower clamping grooves, the prefabricated middle plates are clamped between the underground wall and the prefabricated middle longitudinal beams to prevent the prefabricated middle plates from shifting, and the prefabricated middle plates are adjusted to be at a preset height for cushioning;

s5, pouring concrete into the gaps between the upper clamping groove and the lower clamping groove to form a concrete leveling layer, and accurately leveling through the concrete leveling layer to ensure accurate elevation of the prefabricated middle plate.

Preferably, the other end of the prefabricated middle plate is pre-provided with an upper clamping groove which is the same as the end of the underground wall; the prefabricated middle longitudinal beam at the other side of the prefabricated middle plate is provided with a reserved protruding tongue-and-groove which is the same as that in the underground wall, and the lower tongue-and-groove is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate in through a working well, placing the prefabricated middle plate above a steel structure clamping groove pre-buried in the underground wall and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam, and aligning the upper clamping groove with the lower clamping groove; a plurality of sliding jacks are respectively arranged in the lower clamping grooves at the two sides;

S32, sliding and adjusting the longitudinal position of the sliding jack, so that the sliding jack is positioned under the upper clamping groove of the prefabricated middle plate, and each jack is in a contracted state;

S33, simultaneously lifting all the sliding jacks on two sides to the same height, supporting the prefabricated middle plate, and separating from the underground wall and the prefabricated middle longitudinal beam;

S34, simultaneously longitudinally sliding the sliding jacks at two sides to transport the prefabricated middle plate to a preset installation position;

S35, simultaneously lowering all the sliding jacks at two sides, putting down the prefabricated middle plate, and supporting the prefabricated middle plate above a pre-buried steel structure clamping groove of the underground wall and a reserved protruding tongue-and-groove of a prefabricated middle longitudinal beam to finish the transportation and installation of the single prefabricated middle plate;

S36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates.

Preferably, the method further comprises the steps of:

s4, after each prefabricated middle plate is assembled, on one hand, the sliding jack is moved out from the terminal end, and on the other hand, a plurality of height-adjusting clamping cushion blocks are sequentially inserted into a gap between the upper clamping groove and the lower clamping groove, the prefabricated middle plates are clamped between the underground wall and the prefabricated middle longitudinal beam to prevent the prefabricated middle plates from shifting, and the prefabricated middle plates are adjusted to a preset height for cushioning;

s5, pouring concrete into the gaps between the upper clamping groove and the lower clamping groove to form a concrete leveling layer, and accurately leveling through the concrete leveling layer to ensure accurate elevation of the prefabricated middle plate.

Preferably, the other end of the prefabricated middle plate is pre-provided with an upper clamping groove which is the same as the end of the underground wall; the prefabricated middle longitudinal beam at the other side of the prefabricated middle plate is provided with a reserved protruding tongue-and-groove which is the same as that in the underground wall, and the lower tongue-and-groove is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate in through a working well, placing the prefabricated middle plate above a steel structure clamping groove pre-buried in the underground wall and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam, and aligning the upper clamping groove with the lower clamping groove; a plurality of sliding jacks are respectively arranged in the lower clamping grooves at the two sides to form a sliding jack group;

S32, starting a hoisting mechanism at the starting end or the finishing end, and traction-adjusting the longitudinal position of the sliding jack group to enable the sliding jack group to be positioned under an upper clamping groove of the prefabricated middle plate, wherein each jack is in a contracted state;

S33, simultaneously lifting all the sliding jacks on two sides to the same height, supporting the prefabricated middle plate, and separating from the underground wall and the prefabricated middle longitudinal beam;

S34, starting a hoisting mechanism at the end point, and dragging sliding jack groups at two sides to drag the prefabricated middle plate to a preset installation position;

S35, simultaneously lowering all the sliding jacks at two sides, putting down the prefabricated middle plate, and supporting the prefabricated middle plate above a pre-buried steel structure clamping groove of the underground wall and a reserved protruding tongue-and-groove of a prefabricated middle longitudinal beam to finish the transportation and installation of the single prefabricated middle plate;

S36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates.

Preferably, the method further comprises the steps of:

S4, after each prefabricated middle plate is assembled, on one hand, a sliding jack group is pulled out by using a hoisting mechanism and a steel strand at the end point, on the other hand, a plurality of height-adjusting clamping blocks are connected in series by using the steel strand at the starting end, the steel strand is sequentially pulled into a gap between an upper clamping groove and a lower clamping groove by using the hoisting mechanism at the end point, the prefabricated middle plates are clamped between an underground wall and a prefabricated middle longitudinal beam to prevent the prefabricated middle plates from shifting, and the prefabricated middle plates are adjusted to a preset height for cushioning;

s5, pouring concrete into the gaps between the upper clamping groove and the lower clamping groove to form a concrete leveling layer, and accurately leveling through the concrete leveling layer to ensure accurate elevation of the prefabricated middle plate.

Preferably, in S5, the concrete screed employs early strength concrete.

The above-described preferred technical features may be combined with each other as long as they do not collide with each other.

In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

1. The full-composite assembled subway station underground wall and prefabricated middle plate node structure solves the problem of hoisting errors of the prefabricated underground wall, and ensures that the prefabricated middle plate can be accurately positioned; the connection of the longitudinal steel bars of the underground wall can be realized by utilizing the rigidity of the connector and the reserved steel bars, so that the prefabricated underground wall is prevented from being weakened and damaged; meanwhile, the node is simple in structure, convenient to apply and high in reliability.

2. The full-composite assembled subway station underground wall and prefabricated middle plate node structure solves the problem of construction deviation of the prefabricated underground wall through a simple structure, and creates possibility for engineering application assistance of pushing the prefabricated underground wall and implementation of the assembled reverse construction subway station.

3. The full-composite assembled subway station underground wall and prefabricated middle plate node structure of the invention prefabricates the propelling underground wall, thereby greatly saving investment and construction period in the construction of the subway station.

4. The node structure of the underground wall and the prefabricated middle plate of the fully-composite assembled subway station has simple structure, and the elevation of the prefabricated middle plate can be ensured by paving the early-strength concrete layer, so that the cost of mechanical deviation correction is greatly reduced; meanwhile, the rigidity of the prefabricated underground wall is ensured through the U-shaped steel and the connector.

5. The invention discloses a full-composite assembled subway station underground wall and prefabricated middle plate node structure, which solves the problem that the prefabricated middle plate of the full-composite assembled reverse construction subway station is difficult to transport and install by adopting a sliding lifting device in a lower clamping groove, and particularly can be formed by only using four sliding jacks, two groups of sliding grooves, a winch and a hand wheel, and has the advantages of simple equipment, high installation speed and higher precision. Saving a great deal of investment and being green and environment-friendly.

6. The full-composite assembled subway station underground wall and prefabricated middle plate node structure solves the large problem by utilizing common equipment combination in life, reduces the research and development of large-scale hoisting and assembling trolleys, and greatly saves investment.

7. According to the full-composite assembled subway station underground wall and prefabricated middle plate node structure, the sliding jack and the winch can be recycled, and no temporary facility is wasted.

8. According to the full-composite assembled subway station underground wall and prefabricated middle plate node structure, after the middle plate is hoisted, concrete blocks and steel blocks with proper sizes can be pulled into clamping grooves of the sliding jacks by utilizing a winch and a steel wire rope, the prefabricated middle plate can be supported by height-adjusting clamps, and grouting fixation can be achieved.

Drawings

FIG. 1 is an assembled schematic diagram of a fully composite fabricated subway station underground wall and prefabricated midplane node structure of the present invention;

FIG. 2 is a schematic view of an underground wall of a fully composite fabricated subway station and an underground wall of a prefabricated middle plate node structure of the invention;

FIG. 3 is a schematic view of a steel structure clamping groove of the node structure of the underground wall and the prefabricated middle plate of the fully-composite assembled subway station;

FIG. 4 is a schematic diagram showing the connection of the longitudinal ribs of the underground wall and the steel structure clamping grooves in the node structure of the underground wall and the prefabricated middle plate of the fully-assembled subway station;

FIG. 5 is a schematic view of a concrete screed in a fully composite fabricated subway station underground wall and prefabricated midplane node structure of the present invention;

FIG. 6 is a schematic structural view of a fully assembled reverse construction subway station prefabricated middle plate mechanized transportation and installation device for shipping the prefabricated middle plate;

FIG. 7 is a schematic diagram of a prefabricated middle plate transfer plan view of the prefabricated middle plate mechanized transportation and installation device of the fully-assembled reverse construction subway station;

FIG. 8 is a detailed schematic diagram of a sliding jack of the fully composite assembled reverse construction subway station prefabricated middle plate mechanized transportation and installation device of the invention;

fig. 9 is an overall front view schematic of the fully composite assembled subway station of the present invention.

The dimensions in the figures are marked in mm.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other. The present invention will be described in further detail with reference to the following embodiments.

As a preferred embodiment of the present invention, as shown in fig. 1 to 4, the present invention provides a node structure of an underground wall and a prefabricated middle plate of a fully composite assembly type subway station, wherein: comprises an underground wall 1, a steel structure clamping groove 2 and a prefabricated middle plate 16;

the underground wall 1 is pre-embedded with the steel structure clamping groove 2 at the central elevation position of the middle plate to form a groove 205 which is opened into the subway station and longitudinally extends along the subway station, and the height of the groove 205 is larger than the thickness of the prefabricated middle plate 16; the steel structure clamping groove 2 is U-shaped as a whole and comprises an upper wing plate 201, a web plate 202 and a lower wing plate 201; wherein, the lower wing plate 201 is preset with a lower clamping groove 105 which is concave downwards and extends longitudinally along the subway station, and an upper clamping groove 104 which is concave upwards and extends longitudinally along the subway station is preset at a corresponding position below the prefabricated middle plate 16; a sliding lifting device is arranged in a gap formed by the lower clamping groove 105 and the upper clamping groove 104, and can support and lift the prefabricated middle plate 16 and drive the prefabricated middle plate 16 to longitudinally move along the subway station; a plurality of steel bar connectors 206 are fixed above the upper wing plate 201 and below the lower clamping groove 105 of the lower wing plate 201, and are respectively connected with the underground wall longitudinal ribs 207 in the underground wall 1 in a matching way.

Preferably, the sliding lifting device comprises a sliding jack 106, and the sliding jack 106 comprises a jack 107, a steel plate 108 and a roller 109; the bottom of the jack 107 is fixed on a steel plate 108 and is used for supporting the lifting prefabricated middle plate 16; a plurality of rollers 109 are arranged below the steel plate 108 and used for rolling and walking in the lower clamping groove 105.

Preferably, the sliding lifting device comprises a traction device, wherein the traction device comprises steel strands 111, steel bars 112 and a hoisting mechanism; the plurality of sliding jacks 106 in the lower clamping groove 105 form a group of sliding jack groups for transporting a prefabricated middle plate 16 together, the sliding jacks 106 at two ends of each group are fixedly connected with each other through steel bars 112, and the sliding jacks 106 at two ends of each group are respectively connected with hoisting mechanisms at the starting end and the finishing end through steel stranded wires 111 and are used for pulling the sliding jack groups.

Preferably, the hoisting mechanism at the terminal end is an electric hoist 113; the hoisting mechanism at the starting end is an electric hoist or a hand wheel 114, or a parallel combination of the electric hoist and the hand wheel 114 is used alternatively.

Other technical indexes adopted by the invention are as follows.

According to the assembled underground wall clamping groove structure, the height of the groove 205 is 800mm, the depth is 200mm, and the steel structure clamping groove 2 is used as a template for manufacturing and forming during prefabrication;

The steel structure clamping groove 2 is formed by manufacturing Q235 section steel with the thickness of 30mm, the inner dimension is 800mm in height and 200mm in depth, the steel bar connectors 206 are welded up and down respectively, and the model of the steel bar connectors 206 is matched with the longitudinal ribs 207 of the underground wall configured by the prefabricated underground wall 1. When binding the steel bars, the steel structure clamping groove 2 is connected with the underground wall longitudinal ribs 207 through the steel bar connector 206, and concrete is poured integrally.

As shown in fig. 5, the concrete leveling layer 204 is mainly used for adjusting the elevation error occurring in the process of hoisting the prefabricated underground wall 1, specifically: the height of the steel structure clamping groove 2 pre-buried in the prefabricated underground wall 1 is 800mm, the central line is aligned with the central line of the prefabricated middle plate 16 during hoisting, the thickness of the prefabricated middle plate 16 is 500mm, and 150mm space is reserved from top to bottom during installation of the prefabricated middle plate 16. The hoisting error of the prefabricated underground wall 1 is not more than 150mm, so that the prefabricated middle plate 16 can be ensured to be at the accurate elevation through the concrete leveling layer 204. The concrete screed 204 is desirably of an early strength concrete in order to achieve strength as quickly as possible.

The recommended size of the upper clamping groove 104 is 120mm (width) x50mm (depth), the recommended size of the lower clamping groove 105 is 120mm (width) x100mm (depth), and the upper clamping groove 104, the lower clamping groove 105 and the direct foundation surface of the sliding jack are required to be lined with thick steel plates, so that concrete is prevented from being crushed due to overlarge local stress.

The external dimensions of the sliding jack 106 according to the present invention are recommended to be 100mm (length) x100mm (width) x135/200mm (height, contracted state/ejected state), and 4 rollers 109 are provided for a single sliding jack 106, and the rollers 109 and the roller bearing 10 need to have sufficient pressure-bearing capacity. The jack 107 needs to have a remote-control jack-up and jack-down function and is welded to the steel plate 108.

The closing height between the upper clamping groove 104 and the lower clamping groove 105 is 150mm, the sliding jack 106 is arranged in the lower clamping groove 105, and the prefabricated middle plate 16 can be jacked up to 50mm when the jacking state is 200 mm; the contracted state has a height of 135mm, and a height of less than 150mm, and can be smoothly pulled out by rotating the hand wheel 114.

In order to achieve the above object, according to another aspect of the present invention, there is also provided a construction method of the above-mentioned all-composite assembled subway station underground wall and prefabricated middle plate node structure, comprising the steps of:

S1, binding a longitudinal rib 207 of the underground wall at the prefabrication factory, placing a steel structure clamping groove 2 at the elevation of a prefabrication middle plate 16, and connecting the longitudinal rib 207 of the underground wall with a steel bar connector 206 above an upper wing plate 201 and below a lower clamping groove 105 of the lower wing plate 201;

S2, pouring concrete to form a prefabricated underground diaphragm wall, wherein a groove 205 and a lower clamping groove 105 are formed in the position of the clamping groove 2 of the steel structure of the prefabricated underground diaphragm wall 1, and the prefabricated underground diaphragm wall 1 is hoisted to the corresponding elevation in a framing manner;

s3, installing the prefabricated middle plate 16 in the groove 205, installing a sliding lifting device in the lower clamping groove 105, and sequentially transporting the prefabricated middle plate 16 to a preset installation position longitudinally and horizontally through the sliding lifting device.

The invention also provides a full-composite assembly type reverse construction subway station prefabricated middle plate mechanized transportation and installation device which is used for horizontal and longitudinal transportation and installation of the prefabricated middle plate.

Wherein, the other end of the prefabricated middle plate 16 is provided with an upper clamping groove 104 which is the same as the end of the underground wall in advance; the prefabricated middle longitudinal beam 15 at the other side of the prefabricated middle plate is reserved with a convex tongue-and-groove, and is provided with a lower clamping groove 105 which is the same as that in the underground wall, and the lower clamping groove 105 is provided with a sliding lifting device which is the same as that on one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate 16 in through a working well, placing the prefabricated middle plate on a pre-buried steel structure clamping groove 2 of the underground wall 1 and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam 15, and aligning an upper clamping groove 104 with a lower clamping groove 105; the lower clamping grooves 105 at both sides are respectively provided with a sliding lifting device;

S32, sliding and adjusting the longitudinal position of the sliding lifting device, so that the sliding lifting device is positioned right below the upper clamping groove 104 of the prefabricated middle plate 16 and is in a contracted state;

s33, simultaneously lifting the sliding lifting devices on two sides to the same height, and supporting the prefabricated middle plate 16 to separate from the underground wall 1 and the prefabricated middle longitudinal beam 15;

S34, simultaneously longitudinally sliding the sliding lifting devices on two sides to transport the prefabricated middle plate 16 to a preset installation position;

s35, simultaneously lowering the sliding lifting devices on two sides, putting down the prefabricated middle plate 16, supporting the prefabricated middle plate 16 above the pre-embedded steel structure clamping groove 2 of the underground wall 1 and the reserved protruding rabbet of the prefabricated middle longitudinal beam 15, and completing transportation and installation of the single prefabricated middle plate 16;

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates 16.

Preferably, the method further comprises the steps of:

S4, after each prefabricated middle plate 16 is assembled, on one hand, the sliding lifting device is moved out from the terminal end, and on the other hand, a plurality of height-adjusting clamping cushion blocks are sequentially inserted into a gap between the upper clamping groove 104 and the lower clamping groove 105, so that the prefabricated middle plates 16 are clamped between the underground wall 1 and the prefabricated middle longitudinal beams 15 to prevent the prefabricated middle plates 16 from shifting, and the prefabricated middle plates 16 are adjusted to a preset height for cushioning;

S5, concrete is poured into the gaps between the upper clamping groove 104 and the lower clamping groove 105 to form a concrete leveling layer 204, and accurate leveling is performed through the concrete leveling layer 204, so that the elevation of the prefabricated middle plate 16 is ensured to be accurate.

As a second embodiment, the other end of the prefabricated middle plate 16 is provided with an upper clamping groove 104 which is the same as the end of the underground wall; the prefabricated middle longitudinal beam 15 at the other side of the prefabricated middle plate is reserved with a convex tongue-and-groove, and is provided with a lower clamping groove 105 which is the same as that in the underground wall, and the lower clamping groove 105 is provided with a sliding lifting device which is the same as that on one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate 16 in through a working well, placing the prefabricated middle plate on a pre-buried steel structure clamping groove 2 of the underground wall 1 and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam 15, and aligning an upper clamping groove 104 with a lower clamping groove 105; a plurality of sliding jacks 106 are respectively arranged in the lower clamping grooves 105 at two sides;

S32, sliding and adjusting the longitudinal position of the sliding jack 106, so that the sliding jack 106 is positioned right below the upper clamping groove 104 of the prefabricated middle plate 16, and each jack 107 is in a contracted state;

S33, simultaneously lifting all the sliding jacks 106 on two sides to the same height, and supporting the prefabricated middle plate 16 to be separated from the underground wall 1 and the prefabricated middle longitudinal beam 15;

s34, simultaneously longitudinally sliding the sliding jacks 106 on two sides to transport the prefabricated middle plate 16 to a preset installation position;

S35, simultaneously lowering all the sliding jacks 106 on two sides, putting down the prefabricated middle plate 16, supporting the prefabricated middle plate 16 above the pre-embedded steel structure clamping groove 2 of the underground wall 1 and the reserved protruding rabbet of the prefabricated middle longitudinal beam 15, and completing transportation and installation of the single prefabricated middle plate 16;

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates 16.

Preferably, the method further comprises the steps of:

S4, after each prefabricated middle plate 16 is assembled, on one hand, moving out the sliding jack 106 at the terminal end, and on the other hand, sequentially inserting a plurality of height-adjusting clamping cushion blocks into a gap between the upper clamping groove 104 and the lower clamping groove 105, clamping the prefabricated middle plates 16 between the underground wall 1 and the prefabricated middle longitudinal beams 15 to prevent the prefabricated middle plates 16 from shifting, and adjusting the prefabricated middle plates 16 to a preset height for cushioning;

S5, concrete is poured into the gaps between the upper clamping groove 104 and the lower clamping groove 105 to form a concrete leveling layer 204, and accurate leveling is performed through the concrete leveling layer 204, so that the elevation of the prefabricated middle plate 16 is ensured to be accurate.

As a third embodiment, the other end of the prefabricated middle plate 16 is provided with an upper clamping groove 104 which is the same as the end of the underground wall; the prefabricated middle longitudinal beam 15 at the other side of the prefabricated middle plate is reserved with a convex tongue-and-groove, and is provided with a lower clamping groove 105 which is the same as that in the underground wall, and the lower clamping groove 105 is provided with a sliding lifting device which is the same as that on one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate 16 in through a working well, placing the prefabricated middle plate on a pre-buried steel structure clamping groove 2 of the underground wall 1 and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam 15, and aligning an upper clamping groove 104 with a lower clamping groove 105; a plurality of sliding jacks 106 are respectively arranged in the lower clamping grooves 105 at the two sides to form a sliding jack group;

S32, starting a hoisting mechanism at the starting end or the finishing end, and traction-adjusting the longitudinal position of the sliding jack group to enable the sliding jack group to be positioned right below the upper clamping groove 104 of the prefabricated middle plate 16, wherein each jack 107 is in a contracted state;

S33, simultaneously lifting all the sliding jacks 106 on two sides to the same height, and supporting the prefabricated middle plate 16 to be separated from the underground wall 1 and the prefabricated middle longitudinal beam 15;

s34, starting a hoisting mechanism at the end point, and dragging sliding jack groups at two sides to drag the prefabricated middle plate 16 to a preset installation position;

S35, simultaneously lowering all the sliding jacks 106 on two sides, putting down the prefabricated middle plate 16, supporting the prefabricated middle plate 16 above the pre-embedded steel structure clamping groove 2 of the underground wall 1 and the reserved protruding rabbet of the prefabricated middle longitudinal beam 15, and completing transportation and installation of the single prefabricated middle plate 16;

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates 16.

Preferably, the method further comprises the steps of:

S4, after each prefabricated middle plate 16 is assembled, on one hand, a sliding jack group is pulled out by using a hoisting mechanism and a steel strand 111 at a terminal end, on the other hand, a plurality of height-adjusting clamping blocks are connected in series by using the steel strand 111 at a starting end, the steel strand is sequentially pulled into a gap between an upper clamping groove 104 and a lower clamping groove 105 by using the hoisting mechanism at the terminal end, the prefabricated middle plates 16 are clamped between the underground wall 1 and the prefabricated middle longitudinal beams 15 to prevent the prefabricated middle plates 16 from shifting, and the prefabricated middle plates 16 are adjusted to a preset height for cushioning;

S5, concrete is poured into the gaps between the upper clamping groove 104 and the lower clamping groove 105 to form a concrete leveling layer 204, and accurate leveling is performed through the concrete leveling layer 204, so that the elevation of the prefabricated middle plate 16 is ensured to be accurate.

Preferably, in S5 of all three embodiments, the concrete screed 204 is an early strength concrete.

As shown in fig. 9, the present invention further provides a fully-assembled underground structure (for example, a subway station), which adopts the fully-assembled underground wall and prefabricated middle plate node structure of the subway station and the construction method, wherein:

Comprises an underground wall 1 and a main body structure upright post; the top of the underground wall is provided with a crown beam 5, and a steel structure clamping groove 2 for installing the prefabricated middle plate in a pre-buried mode is used for positioning and supporting when the prefabricated middle plate is hoisted, the height of the clamping groove is larger than the thickness of the middle plate, when the elevation of the clamping groove of the underground wall has errors, the clamping groove of the underground wall allows the two to move relatively, and the middle plate can still be ensured to be positioned at the designed elevation; the top of the main body structure upright post is provided with a prefabricated top longitudinal beam 8, and the middle of the main body structure upright post is provided with a prefabricated middle longitudinal beam 15. The main structure upright post comprises a pile foundation 3 and a steel upright post 4, and the steel upright post 4 is required to be inserted into the pile foundation 3 for a certain depth, so that reliable combination of the pile foundation 3 and the steel upright post is ensured; the steel upright post 4 adopts a steel pipe concrete column, steel reinforced concrete or outsourcing concrete to form a steel pipe concrete superposed column. A top plate pre-stress jack 11 is arranged between the crown beam 5 and the prefabricated top plate 9, and a middle plate pre-stress jack 19 is arranged between the steel structure clamping groove 2 and the prefabricated middle plate 16. In consideration of certain errors required for installation and positioning of the prefabricated members, transverse prestressing force is applied to the top plate prefabricated members and the middle plate prefabricated members through the top plate prestressing force jack 11 and the middle plate prestressing force jack 19 respectively, so that the reserved errors are balanced and offset, deformation of the underground wall is controlled, and safety and stability of the foundation pit and surrounding structures are ensured. The precast slabs are tensioned and locked into a whole longitudinally (in the direction of paper) by adopting prestressed steel bars or locking steel bars section by section.

The prefabricated roof 9 arranged between the prefabricated roof longitudinal beams 8, the crown beam 5 and the prefabricated roof longitudinal beams 8, the prefabricated roof 9 arranged between two adjacent prefabricated roof longitudinal beams 8, the roof cast-in-situ layer 12 on the roof and the roof flexible waterproof layer 13 on the roof cast-in-situ layer form a composite waterproof prestress roof together.

The prefabricated middle longitudinal beam 15, the steel structure clamping groove 2, the prefabricated middle plate 16 arranged between the prefabricated middle longitudinal beams 15, the prefabricated middle plate 16 arranged between the two adjacent prefabricated middle longitudinal beams 15 and the middle plate cast-in-situ layer 20 on the middle plate jointly form a composite prestress middle plate.

The prefabricated cushion layer 23, the bottom plate waterproof layer 24 and the cast-in-situ bottom plate 25 which are sequentially arranged on the substrate from bottom to top form a composite waterproof bottom plate together.

The underground wall 1 and the side wall waterproof layer and the side wall cast-in-situ layer which are sequentially arranged in the inward direction of the underground wall form a composite waterproof wall together.

The prefabricated top plate 9 is hung with a prefabricated pipeline bracket 10 through a pre-buried groove to form an integral prefabricated member. The prefabricated middle plate 16 is hung with the prefabricated pipeline bracket 10 and the prefabricated rail top air duct 28 through the pre-buried groove, and is provided with the pre-buried pipeline sleeve 18 in a penetrating way up and down to form an integral prefabricated member. Grooves are reserved on the inner side of the crown beam 5, protruding rabbets are reserved on the two sides of the prefabricated top longitudinal beam 8, protruding rabbets are reserved on the two sides of the prefabricated middle longitudinal beam 15, and the prefabricated top plate 9 and the prefabricated middle plate 16 are convenient to hoist and mount.

The composite waterproof prestress top plate, the composite prestress middle plate, the composite waterproof bottom plate and the composite waterproof wall are effectively connected to form the fully-covered waterproof fully-composite assembled underground structure, so that the problem of water leakage of the fully-assembled underground structure is solved, the limitation of the application range of the assembled underground structure is broken through, the assembled underground structure can be applied to water-rich stratum, areas with complex surrounding environment and high deformation control, and the assembled underground structure can be forcefully pushed to be widely applied to underground engineering. The invention replaces a large number of internal supports and templates of the conventional open cut cast-in-situ structure, thereby saving investment; meanwhile, the pre-axial pressure can be set on the prefabricated part to balance and offset the deformation of the assembly gaps, so that the surrounding environment can be effectively protected, and the safety of the foundation pit is ensured. The prefabricated components are manufactured in a factory and mechanically constructed, so that the high quality and the superior quality of the underground structural engineering are realized, the traditional ceiling decoration is replaced, the embedded channels are used for realizing the standardized and mechanical installation of the comprehensive pipeline, the investment and the construction period are saved, the environment-friendly construction is realized, the energy is saved, the environment is protected, the technology is advanced, the sustainable development and the environment-friendly construction are realized, the practicability is strong, and the application space is wide in the field of the underground engineering.

The invention relates to a reverse construction method of a composite assembled underground structure, which comprises the following steps:

S1, constructing an underground wall 1 and a main structure upright column, wherein a steel structure clamping groove 2 for installing a prefabricated middle plate is pre-buried on the underground wall 1; in the step S1, the underground wall 1 is a concrete underground continuous wall or a prefabricated underground wall which is poured underwater; the construction method of the main structure column comprises the steps of firstly constructing a pile foundation 3, then hoisting a steel column 4, inserting the steel column into the pile foundation 3, and forming a steel pipe concrete superposed column by the steel column 4 by adopting a steel pipe concrete column, steel reinforced concrete or outsourcing concrete.

S2, shi Zuoguan beams 5 and retaining walls 6.

S3, excavating an earth surface 7 below the roof beam, and hoisting the prefabricated roof beam 8 and the prefabricated roof 9, wherein the prefabricated pipeline bracket 10 is pre-buried in the factory manufacturing process of the prefabricated roof. Preferably, a groove is reserved in the construction of the crown beam 5, and a convex tongue-and-groove is reserved in the prefabricated roof rail 8 for hoisting and placing the prefabricated roof 9.

S4, pre-stressing is firstly applied to the prefabricated top plate 9 through a top plate pre-stressing jack 11 between the crown beam 5 and the prefabricated top plate 9, then a top plate cast-in-situ layer 12 is cast, and a top plate flexible waterproof layer 13 is constructed, wherein a plurality of soil outlet and feeding holes are longitudinally arranged along the top plate according to the requirements of soil outlet and feeding.

S5, under the support of the precast beam slab system, excavating earth downwards to the lower side of the lower middle beam synchronously, and excavating the earth 14. Preferably, in the S4-S5, after the top plate precast beam plate system, the cast-in-situ layer and the waterproof layer are completed, pipelines can be restored and backfilled with earth, traffic is restored, and the influence on urban traffic and pipelines can be reduced.

S6, hoisting the prefabricated middle longitudinal beam 15 and the prefabricated middle plate 16 by using the upper layer of soil outlet and feeding holes, wherein a hanging installation groove pre-buried with the prefabricated pipeline bracket 17, the pre-buried pipeline sleeve 18 and the prefabricated rail top air duct 28 is arranged in the factory manufacturing process of the prefabricated middle plate. The underground wall 1 is embedded with a steel structure clamping groove 2 at the elevation position of the middle plate, and a convex tongue-and-groove is reserved on the prefabricated middle longitudinal beam 15 for hoisting and placing the prefabricated middle plate 16. During hoisting, the steel structure clamping groove 2 reserved in the underground diaphragm wall 1 is inserted into the middle longitudinal beam rabbet reserved in the prefabricated middle longitudinal beam 15. The installation and positioning and horizontal transportation of the prefabricated middle plate adopt the node structure technology of the underground wall of the fully-composite assembled subway station and the prefabricated middle plate.

S7, pre-stressing the prefabricated middle plate 16 by utilizing the middle plate pre-stressing jack 19 in the steel structure clamping groove 2, and then casting the middle plate cast-in-situ layer 20, wherein the soil outlet and the feeding holes of the middle plate correspond to the upper layer.

S8, synchronously excavating downwards under the support of the precast beam plate; and synchronously constructing an underground one-layer side wall waterproof layer 21 and an underground one-layer side wall cast-in-situ layer 22.

S9, downwards circulating S5-S7, and excavating to the bottom of the foundation pit.

S10, installing a prefabricated cushion layer 23, applying a waterproof layer 24 of a base plate and casting a base plate 25 in situ.

S11, constructing a bottom plate layer side wall waterproof layer 26 and a bottom plate layer side wall cast-in-situ layer 27; and simultaneously and sequentially replenishing the soil outlet and the feeding hole.

Preferably, after S11, further comprising:

And S12, after the main body of the composite assembled underground structure is finished and shield construction within the influence range of the adjacent sections is finished, installing the prefabricated rail top air duct 28 through a suspension installation groove pre-buried in the prefabricated middle plate.

The fully-covered waterproof fully-composite assembled underground structure and the construction method have the advantages that the whole construction process does not need to be provided with the support and the templates, the construction operation can be synchronized under the upper plate and the lower plate, the time for waiting for the formation of the age is greatly shortened, the construction method is environment-friendly, quick, convenient, safe, efficient, environment-friendly, energy-saving, investment-saving and the like, and the application space is wide.

The top plate, the middle plate prefabricated member and the cast-in-situ layer replace the internal support and the template, the main structure is finished after the bottom plate is closed and the side wall is finished by utilizing the arranged unearthed feeding holes, unearthed, feeding, hoisting the prefabricated middle plate and assembly machinery to enter and exit.

The structure cast-in-situ layer comprises a top plate cast-in-situ layer, a middle plate cast-in-situ layer and a cast-in-situ bottom plate, and prefabricated members are used as templates during casting, so that a large number of templates can be saved.

The fully-composite assembled underground structure construction method is characterized in that the top plate prefabricated member, the cast-in-situ layer, the middle plate prefabricated member and the cast-in-situ layer are utilized to replace an inner support system, so that the surrounding construction materials of the foundation pit can be effectively protected, and a large amount of engineering investment is saved.

The fully-composite assembled underground structure construction method is characterized in that the top plate prefabricated member, the cast-in-situ layer, the middle plate prefabricated member and the cast-in-situ layer are utilized to replace an inner support system, so that the surrounding construction materials of the foundation pit can be effectively protected, and a large amount of engineering investment is saved. In consideration of certain errors required for installation and positioning of the prefabricated members, transverse prestressing force is applied to the top plate prefabricated members and the middle plate prefabricated members through the top plate prestressing force jack and the middle plate prestressing force jack respectively, so that the reserved errors are balanced and offset, deformation of the underground wall is controlled, and safety and stability of the foundation pit and surrounding structures are ensured. The precast slabs are tensioned and locked into a whole longitudinally (in the direction of paper) by adopting prestressed steel bars or locking steel bars section by section.

The splicing and assembling of the prefabricated components of the structure are completed, and the assembled components are connected through mortises and high-strength bolts; the prefabricated cushion layer can also adopt a cast-in-place concrete structure.

The composite assembled underground structure and the construction method thereof are applicable to underground one layer, two layers and more layers, and can be applicable to a non-column single-span, single-column double-span, double-column three-span or more-span multilayer underground structure according to engineering requirements.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A full-composite assembled subway station underground wall and prefabricated medium plate node structure is characterized in that: comprises an underground wall (1), a steel structure clamping groove (2) and a prefabricated middle plate (16);

The underground wall (1) is pre-embedded with the steel structure clamping groove (2) at the central elevation position of the prefabricated middle plate (16) to form a groove (205) which is opened into the subway station and longitudinally extends along the subway station, and the height of the groove (205) is larger than the thickness of the prefabricated middle plate (16);

The steel structure clamping groove (2) is U-shaped as a whole and comprises an upper wing plate (201), a web plate (202) and a lower wing plate (203);

The lower wing plate (203) is provided with a lower clamping groove (105) which is concave downwards and extends longitudinally along the subway station, and an upper clamping groove (104) which is concave upwards and extends longitudinally along the subway station is provided at a corresponding position below the prefabricated middle plate (16); a sliding lifting device is arranged in a gap formed by the lower clamping groove (105) and the upper clamping groove (104), can support and lift the prefabricated middle plate (16) and drive the prefabricated middle plate (16) to longitudinally move along the subway station, and can be moved out after the prefabricated middle plate (16) is assembled;

A height-adjusting clamping cushion block is further arranged in a gap between the upper clamping groove (104) and the lower clamping groove (105) so as to clamp the prefabricated middle plate (16) between the underground wall (1) and the prefabricated middle longitudinal beam (15) to prevent the prefabricated middle plate (16) from shifting, and the prefabricated middle plate (16) is adjusted to a preset height for cushioning;

concrete is poured into a gap between the upper clamping groove (104) and the lower clamping groove (105) to form a concrete leveling layer (204), and accurate leveling is performed through the concrete leveling layer (204), so that the elevation of the prefabricated middle plate (16) is ensured to be accurate;

A plurality of steel bar connectors (206) are fixed above the upper wing plate (201) and below the lower clamping groove (105) of the lower wing plate (203), and are respectively connected with underground wall longitudinal ribs (207) in the underground wall (1) in a matching way.

2. The fully composite fabricated subway station underground wall and prefabricated middle plate node structure of claim 1, wherein:

The sliding lifting device comprises a sliding jack (106), wherein the sliding jack (106) comprises a jack (107), a steel plate (108) and a roller (109);

The bottom of the jack (107) is fixed on a steel plate (108) and is used for supporting the lifting prefabricated middle plate (16); a plurality of rollers (109) are arranged below the steel plate (108) and are used for rolling and walking in the lower clamping groove (105).

3. The fully composite fabricated subway station underground wall and prefabricated middle plate node structure of claim 2, wherein:

The sliding lifting device comprises a traction device, wherein the traction device comprises steel strands (111), steel bars (112) and a hoisting mechanism;

a plurality of sliding jacks (106) in the lower clamping groove (105) form a group of sliding jack groups for jointly transporting a prefabricated middle plate (16), the sliding jacks are fixedly connected with one another through steel bars (112), and the sliding jacks (106) at two ends of each group are respectively connected with hoisting mechanisms at the starting end and the finishing end through steel strands (111) and used for traction of the sliding jack groups.

4. The fully composite fabricated subway station underground wall and prefabricated middle plate node structure of claim 3, wherein:

the hoisting mechanism at the terminal end is an electric hoist (113); the hoisting mechanism at the starting end is an electric hoist or a hand wheel (114), or the parallel combination of the electric hoist and the hand wheel (114) is used for alternative use.

5. A method of constructing a node structure of a prefabricated middle plate and a basement wall of a fully assembled subway station as claimed in claim 3, comprising the steps of:

S1, binding an underground wall longitudinal rib (207) at the prefabrication factory, placing a steel structure clamping groove (2) at the elevation of a prefabrication middle plate (16), and connecting the underground wall longitudinal rib (207) with a steel bar connector (206) above an upper wing plate (201) and below a lower clamping groove (105) of a lower wing plate (203);

s2, pouring concrete to form a prefabricated underground continuous wall, wherein a groove (205) and a lower clamping groove (105) are formed in the position of the steel structure clamping groove (2) of the prefabricated underground wall (1), and the prefabricated underground wall (1) is hoisted to the corresponding elevation position in a framing manner;

s3, installing the prefabricated middle plate (16) in the groove (205), installing a sliding lifting device in the lower clamping groove (105), and sequentially transporting the prefabricated middle plate (16) to a preset installation position longitudinally and horizontally through the sliding lifting device;

s4, after each prefabricated middle plate (16) is assembled, on one hand, the sliding lifting device is moved out from the terminal end, and on the other hand, a plurality of height-adjusting clamping cushion blocks are sequentially inserted into a gap between the upper clamping groove (104) and the lower clamping groove (105), the prefabricated middle plates (16) are clamped between the underground wall (1) and the prefabricated middle longitudinal beams (15) to prevent the prefabricated middle plates (16) from shifting, and the prefabricated middle plates (16) are adjusted to a preset height for cushioning;

S5, pouring concrete into gaps between the upper clamping groove (104) and the lower clamping groove (105) to form a concrete leveling layer (204), and accurately leveling through the concrete leveling layer (204) to ensure accurate elevation of the prefabricated middle plate (16).

6. The construction method of the full-composite assembled subway station underground wall and prefabricated middle plate node structure, as claimed in claim 5, is characterized by comprising the following steps: in the step S4 of the process,

After each prefabricated middle plate (16) is assembled, on one hand, the sliding jack (106) is moved out from the terminal end, and on the other hand, a plurality of height-adjusting clamping cushion blocks are sequentially inserted into a gap between the upper clamping groove (104) and the lower clamping groove (105), the prefabricated middle plates (16) are clamped between the underground wall (1) and the prefabricated middle longitudinal beams (15) to prevent the prefabricated middle plates (16) from shifting, and the prefabricated middle plates (16) are adjusted to a preset height to be cushioned;

Or alternatively

After each prefabricated middle plate (16) is assembled, on one hand, a sliding jack group is pulled out by using a hoisting mechanism and a steel strand (111) at the end point, on the other hand, a plurality of height-adjusting clamping blocks are connected in series by using the steel strand (111) at the starting end, the steel strand is sequentially pulled into a gap between an upper clamping groove (104) and a lower clamping groove (105) by using the hoisting mechanism at the end point, the prefabricated middle plate (16) is clamped between the underground wall (1) and the prefabricated middle longitudinal beam (15) to prevent the prefabricated middle plate (16) from shifting, and the prefabricated middle plate (16) is adjusted to be cushioned at a preset height.

7. The construction method of the full-composite assembled subway station underground wall and prefabricated middle plate node structure as claimed in claim 6, wherein the construction method comprises the following steps:

in S5, the concrete screed (204) is an early strength concrete.

8. The construction method of the full-composite assembled subway station underground wall and prefabricated middle plate node structure according to any one of claims 5 to 7, wherein:

The other end of the prefabricated middle plate (16) is provided with an upper clamping groove (104) which is the same as the end of the underground wall in advance; a prefabricated middle longitudinal beam (15) at the other side of the prefabricated middle plate is reserved with a protruding tongue-and-groove, and is provided with a lower clamping groove (105) which is the same as that in the underground wall, and the lower clamping groove (105) is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate (16) in through a working well, placing the prefabricated middle plate on a steel structure clamping groove (2) pre-buried in the underground wall (1) and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam (15), and aligning an upper clamping groove (104) with a lower clamping groove (105); the lower clamping grooves (105) at the two sides are respectively provided with a sliding lifting device;

S32, sliding and adjusting the longitudinal position of the sliding lifting device, so that the sliding lifting device is positioned right below an upper clamping groove (104) of the prefabricated middle plate (16) and is in a contracted state;

S33, simultaneously lifting the sliding lifting devices on two sides to the same height, and lifting the prefabricated middle plate (16) to separate from the underground wall (1) and the prefabricated middle longitudinal beam (15);

S34, simultaneously longitudinally sliding the sliding lifting devices on two sides to transport the prefabricated middle plate (16) to a preset installation position;

S35, simultaneously lowering the sliding lifting devices on two sides, putting down the prefabricated middle plate (16), supporting the prefabricated middle plate on the pre-embedded steel structure clamping groove (2) of the underground wall (1) and the reserved protruding rabbet of the prefabricated middle longitudinal beam (15), and completing transportation and installation of the single prefabricated middle plate (16);

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates (16).

9. The construction method of the full-composite assembled subway station underground wall and prefabricated middle plate node structure according to any one of claims 5 to 7, wherein:

The other end of the prefabricated middle plate (16) is provided with an upper clamping groove (104) which is the same as the end of the underground wall in advance; a prefabricated middle longitudinal beam (15) at the other side of the prefabricated middle plate is reserved with a protruding tongue-and-groove, and is provided with a lower clamping groove (105) which is the same as that in the underground wall, and the lower clamping groove (105) is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

S31, hanging the prefabricated middle plate (16) in through a working well, placing the prefabricated middle plate on a steel structure clamping groove (2) pre-buried in the underground wall (1) and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam (15), and aligning an upper clamping groove (104) with a lower clamping groove (105); a plurality of sliding jacks (106) are respectively arranged in the lower clamping grooves (105) at the two sides;

S32, sliding and adjusting the longitudinal position of the sliding jack (106) to enable the sliding jack (106) to be located under the upper clamping groove (104) of the prefabricated middle plate (16), wherein each jack (107) is in a contracted state;

s33, simultaneously lifting all the sliding jacks (106) on two sides to the same height, and supporting the prefabricated middle plate (16) to be separated from the underground wall (1) and the prefabricated middle longitudinal beam (15);

s34, simultaneously longitudinally sliding the sliding jacks (106) on two sides to transport the prefabricated middle plate (16) to a preset installation position;

S35, simultaneously lowering all the sliding jacks (106) at two sides, putting down the prefabricated middle plate (16), supporting the prefabricated middle plate on the reserved protruding rabbets of the pre-embedded steel structure clamping groove (2) and the prefabricated middle longitudinal beam (15) of the underground wall (1), and completing transportation and installation of the single prefabricated middle plate (16);

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates (16).

10. The construction method of the full-composite assembled subway station underground wall and prefabricated middle plate node structure according to any one of claims 5 to 7, wherein:

The other end of the prefabricated middle plate (16) is provided with an upper clamping groove (104) which is the same as the end of the underground wall in advance; a prefabricated middle longitudinal beam (15) at the other side of the prefabricated middle plate is reserved with a protruding tongue-and-groove, and is provided with a lower clamping groove (105) which is the same as that in the underground wall, and the lower clamping groove (105) is provided with a sliding lifting device which is the same as that at one side of the underground wall;

In S3, the method further comprises the steps of mechanically transporting and installing the prefabricated middle plate:

s31, hanging the prefabricated middle plate (16) in through a working well, placing the prefabricated middle plate on a steel structure clamping groove (2) pre-buried in the underground wall (1) and a reserved protruding tongue-and-groove of the prefabricated middle longitudinal beam (15), and aligning an upper clamping groove (104) with a lower clamping groove (105); a plurality of sliding jacks (106) are respectively arranged in the lower clamping grooves (105) at the two sides to form a sliding jack group;

S32, starting a hoisting mechanism at the starting end or the finishing end, and pulling and adjusting the longitudinal position of the sliding jack group to enable the sliding jack group to be positioned under an upper clamping groove (104) of the prefabricated middle plate (16), wherein each jack (107) is in a contracted state;

s33, simultaneously lifting all the sliding jacks (106) on two sides to the same height, and supporting the prefabricated middle plate (16) to be separated from the underground wall (1) and the prefabricated middle longitudinal beam (15);

S34, starting a hoisting mechanism at the end point, and dragging sliding jack groups at two sides to drag the prefabricated middle plate (16) to a preset installation position;

S35, simultaneously lowering all the sliding jacks (106) at two sides, putting down the prefabricated middle plate (16), supporting the prefabricated middle plate on the reserved protruding rabbets of the pre-embedded steel structure clamping groove (2) and the prefabricated middle longitudinal beam (15) of the underground wall (1), and completing transportation and installation of the single prefabricated middle plate (16);

s36, circulating S31-S35, and completing the assembly of all other prefabricated middle plates (16).