CN108193695B - Subway station foundation pit support structure support and construction method - Google Patents
Subway station foundation pit support structure support and construction method Download PDFInfo
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- CN108193695B CN108193695B CN201810073855.5A CN201810073855A CN108193695B CN 108193695 B CN108193695 B CN 108193695B CN 201810073855 A CN201810073855 A CN 201810073855A CN 108193695 B CN108193695 B CN 108193695B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
A subway station foundation pit support and construction method relates to the technical field of underground structure engineering; underground continuous walls are arranged around the foundation pit of the subway station, reinforced concrete crown beams are arranged at the top of the underground continuous walls, a plurality of first supports are arranged at intervals along the direction of a line, and the first supports are supported or fixed on the reinforced concrete crown beams; a plurality of steel pipe supports are arranged below the first support at intervals along the vertical direction, and each steel pipe support is provided with a plurality of steel pipe supports at intervals along the line direction; the special steel pipe joint is arranged on the same side of the foundation pit and is connected with the first embedded steel plate through bolts; the two sides and the top of the steel pipe are welded with connecting steel plates, steel plate rings are sleeved on the steel pipe at the two ends of the connecting steel plates, and the steel plate rings are welded with the outer wall of the steel pipe. The invention does not need to be applied to temporary lattice columns, lattice column foundation piles and connecting beams, saves resources and is convenient for the construction of the soil excavation operation and the structure.
Description
Technical Field
The invention relates to the technical field of underground structure engineering, in particular to a subway station foundation pit support structure support and a construction method.
Background
Over 30 cities are being built on a large scale in the whole country, and over 20 subway stations are generally built for each subway. The subway station is generally of a strip-shaped structure, the width of the station is 18m-25m, and the length of the station is 200m-300m. At present, a subway station foundation pit support structure generally adopts a vertical retaining structure and a support, and the support adopts a reinforced concrete support or a steel pipe support; for a subway station foundation pit with a two-layer structure, three supports are generally arranged when the strength of a site soil body is high, the first support is generally a reinforced concrete support or a steel pipe support, and the second support and the third support are generally steel pipe supports. When the width of the foundation pit is smaller (for example, less than or equal to 20 m), temporary lattice columns and column pile foundations are not applied in the middle of the foundation pit; when the pit width is larger (for example, > 20 m), temporary lattice columns and pile foundations of the lattice columns are needed to be applied in the middle of the foundation pit, and the distance between the temporary lattice columns along the line direction is 6m-9m. When the subway foundation pit is excavated, the excavator is arranged at the bottom of the foundation pit for operation, and the existence of the lattice columns brings inconvenience to the excavation; for soft soil areas, the length of the lattice columns needs to be several tens of meters deep. For example, the station of the line 3 cross mountain of the track traffic in su zhou has a standard section foundation pit depth of 17.9m, a temporary lattice column foundation pile length of 20m and a pile diameter of 850mm.
The stress of the foundation pit support of the subway station is mainly equal to the characteristics of soil mass of a field, the groundwater level, the distance between the supports along the line direction, the distance between the supports along the vertical direction and the depth of the supports from the ground; the bearing capacity of the steel pipe support is mainly related to the diameter, the wall thickness and the calculated length of the steel pipe. The longer the steel pipe, the smaller the compressive load bearing capacity of the steel pipe. The design of the subway station foundation pit support structure is that the distance between the steel pipe supports along the line direction is mostly 3.0m. When the foundation pit is wider, temporary lattice columns and connecting beams are arranged in the middle of the foundation pit, so that vertical and horizontal constraints are applied to the steel pipes at the middle positions of the steel pipes, the calculated length of the steel pipe support is reduced, and the bearing capacity of the steel pipe support is improved.
The statistics of the stress calculation results of a large number of subway foundation pit support structures show that: (1) The first support is smaller in stress, and temporary lattice columns are not required to be arranged in stress; (2) The second and following support stresses are relatively high, and the foundation pit width determines whether the temporary lattice columns are arranged or not.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides the subway station foundation pit support and the construction method which do not need to be applied to temporary lattice columns, lattice column foundation piles and connecting beams, save resources and facilitate the construction of the excavation operation and the structure.
In order to achieve the above purpose, the invention adopts the following technical scheme: a subway station foundation pit support structure comprises an underground continuous wall, a reinforced concrete crown beam, a first support, a steel pipe support, a special steel pipe joint, a connecting rod, a first embedded steel plate, a second embedded steel plate, a steel pipe, a connecting steel plate, an inclined connecting rod and a steel plate circular ring; underground continuous walls are arranged around the foundation pit of the subway station, reinforced concrete crown beams are arranged at the top of the underground continuous walls, a plurality of first supports are arranged at intervals along the direction of a line, and the first supports are supported or fixed on the reinforced concrete crown beams; a plurality of steel pipe supports are arranged below the first support at intervals along the vertical direction, and each steel pipe support is provided with a plurality of steel pipe supports at intervals along the line direction; the special steel pipe joint is arranged on the same side of the foundation pit and is connected with the first embedded steel plate through bolts; the steel pipe is characterized in that steel plates are welded on the two sides and the top of the steel pipe, steel plate rings are sleeved on the steel pipe at the two ends of the steel plates, the steel plate rings are welded with the outer wall of the steel pipe, one end of each steel plate is welded with the steel plate rings, and at least one connecting rod is fixedly connected between the steel plates at the two sides of each special steel pipe section and the steel plates at the two sides of the adjacent special steel pipe section; an oblique connecting rod is arranged between the top connecting steel plate of each special steel pipe joint and the underground diaphragm wall or the reinforced concrete crown beam, the top connecting steel plate is welded with the oblique connecting rod, and the oblique connecting rod is welded with the second embedded steel plate on the underground diaphragm wall or the reinforced concrete crown beam.
Preferably, the special steel pipe sections have the same length, one end of each special steel pipe section is a fixed end, the other end of each special steel pipe section is a connecting end, the end face of each fixed end is provided with a first plugging steel plate, and the end face of each connecting end is provided with a second plugging steel plate; the fixed end and the movable end of the steel pipe support are propped against a first embedded steel plate of the underground continuous wall; and a plurality of nuts are welded on the first embedded steel plate along the periphery of the first blocking steel plate of the fixed end, bolts are arranged on the nuts, and the fixed end is connected with the first embedded steel plate through the bolts.
Preferably, the first plugging steel plate is welded with the outer wall of the steel pipe, a plurality of first rectangular stiffening plates and second rectangular stiffening plates are arranged on the inner side of the steel pipe at one side of the fixed end, two mutually parallel edges of the second rectangular stiffening plates are closely attached to the inner wall of the steel pipe along the axial direction of the steel pipe and are welded, and the other side of the second rectangular stiffening plates is closely attached to the first plugging steel plate; one side of the first rectangular stiffening plate is welded with the inner wall of the steel pipe, the other parallel side is welded with the second rectangular stiffening plate, and the third side of the first rectangular stiffening plate is closely attached to the first plugging steel plate; a plurality of triangular rib plates are arranged between the outer side of the steel pipe at one end of the fixed end and the first plugging steel plate along the outer wall of the steel pipe, a right-angle side of each triangular rib plate is welded with the first plugging steel plate, and the other right-angle side of each triangular rib plate is welded with the outer wall of the steel pipe; the end part of the steel pipe at the connecting end is provided with a second plugging steel plate, the second plugging steel plate is welded with the outer wall of the steel pipe, a plurality of triangular rib plates are arranged between the second plugging steel plate and the outer side of the steel pipe, a right-angle side of each triangular rib plate is welded with the second plugging steel plate, and the other right-angle side of each triangular rib plate is welded with the outer wall of the steel pipe; screw holes are formed in the second plugging steel plate.
Preferably, the connecting rod adopts channel steel or angle steel, and the connecting rod is connected with the connecting steel plate by welding or bolts; when the bolt connection is adopted, screw holes are arranged at the two ends of the channel steel or the angle steel.
A construction method for a subway station foundation pit support structure comprises the following steps:
1. firstly, constructing an underground diaphragm wall 1 along the outer side of a foundation pit of a subway station, wherein a first embedded steel plate and a second embedded steel plate are arranged at a steel pipe supporting position of the underground diaphragm wall;
2. digging a first layer of soil, constructing a crown beam, and pouring or erecting a first support;
3. processing special steel pipe joints and connecting rods;
4. digging a second layer of soil, erecting a second steel pipe support, wherein special steel pipe joints are arranged on one side of a foundation pit, installing connecting rods between the special steel pipe joints in the second steel pipe support, installing oblique connecting rods between a top connecting plate of the special steel pipe joints in the second steel pipe support and an underground continuous wall or a crown beam, welding a plurality of nuts on a first embedded steel plate along the periphery of a fixed end of the special steel pipe joint, arranging bolts on the nuts, and fixing the fixed end of the steel pipe support and the first embedded steel plate through the bolts;
5. digging a third layer of soil, erecting a third steel pipe support, and installing a connecting rod between special steel pipe joints in the third steel pipe; installing an oblique connecting rod between a connecting plate at the top of a special steel pipe joint in a third steel pipe support and an underground continuous wall, welding a plurality of nuts on the first embedded steel plate along the periphery of a fixed end of the steel pipe support, installing bolts on the nuts, and fixing the fixed end of the steel pipe support with the first embedded steel plate through the bolts;
6. digging a fourth layer of soil, and sequentially performing concrete pouring construction on the concrete cushion layer and the bottom plate;
7. dismantling a connecting rod between special steel pipe joints in the third steel pipe support, and an oblique connecting rod between the special steel pipe joints in the third steel pipe support and the underground continuous wall and the third steel pipe support;
8. pouring a side wall and a middle plate of the structure;
9. dismantling a connecting rod between special steel pipe joints in the two steel pipe supports, an inclined connecting rod between the second steel pipe support and an underground continuous wall or a crown beam and the second steel pipe support;
10. and pouring the side wall and the top plate of the structure, and removing the first support.
After the structure is adopted, the beneficial effects of the invention are as follows: according to the subway station foundation pit support and construction method, temporary lattice columns, lattice column foundation piles and connecting beams do not need to be constructed, resources are saved, and the excavation operation and the structure construction are facilitated.
Drawings
FIG. 1 is a schematic cross-sectional view of a foundation pit enclosure;
FIG. 2 is a schematic view of a partial cross section of a steel pipe support along the line direction;
FIG. 3 is a schematic view of a particular steel pipe section;
FIG. 4 is a cross-sectional view of a special steel pipe section 1-1;
FIG. 5 is a cross-sectional view of a particular steel pipe section 2-2;
FIG. 6 is a cross-sectional view of a particular steel pipe section 3-3;
FIG. 7 is a schematic view of nodes such as an oblique connecting rod, a connecting steel plate, a steel plate circular ring and the like;
fig. 8 is a schematic partial cross-sectional view of example 2.
Detailed Description
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Referring to fig. 1-7, the technical scheme adopted by the specific embodiment is as follows: a subway station foundation pit support structure comprises an underground continuous wall 1, a reinforced concrete crown beam 2, a first support 3, a steel pipe support 4, a special steel pipe joint 5, a connecting rod 6, a first embedded steel plate 7, a second embedded steel plate 8, a steel pipe 9, a connecting steel plate 10, an inclined connecting rod 11 and a steel plate circular ring 12; underground continuous walls 1 are arranged around a foundation pit of a subway station, reinforced concrete crown beams 2 are arranged at the top of the underground continuous walls 1, a plurality of first supports 3 are arranged at intervals along the line direction, and the first supports 3 are supported or fixed on the reinforced concrete crown beams 2; a plurality of steel pipe supports are arranged below the first support at intervals along the vertical direction, and a plurality of steel pipe supports 4 are arranged on each steel pipe support at intervals along the line direction at certain horizontal intervals; the steel pipe support 4 is provided with a special steel pipe joint 5 on the same side of the foundation pit, and the special steel pipe joint 5 is connected with a first embedded steel plate 7 through bolts; the two sides and the top of the steel pipe 9 are welded with a connecting steel plate 10, steel plate circular rings 12 are sleeved on the steel pipe 9 at the two ends of the connecting steel plate 10, the steel plate circular rings 12 are welded with the outer wall of the steel pipe 9, one end of the connecting steel plate 10 is welded with the steel plate circular rings 12, and at least one connecting rod 6 is fixedly connected between the connecting steel plates at the two sides of each special steel pipe section 5 and the connecting steel plates at the two sides of the adjacent special steel pipe section 5; an oblique connecting rod 11 is arranged between the top connecting steel plate 10 of each special steel pipe joint 5 and the underground diaphragm wall 1 and the reinforced concrete crown beam 2, the top connecting steel plate 10 is welded with the oblique connecting rod 11, and the oblique connecting rod 11 is welded with the second embedded steel plate 8 on the underground diaphragm wall 1 and the reinforced concrete crown beam 2.
The special steel pipe joint 5 has the same length, one end of the special steel pipe joint is a fixed end 51, the other end of the special steel pipe joint is a connecting end 52, the end face of the fixed end 51 is provided with a first plugging steel plate 53, and the end face of the connecting end 52 is provided with a second plugging steel plate 56; the fixed end 51 and the movable end supported by the steel pipe are propped against the first embedded steel plate 7 of the underground diaphragm wall; a plurality of nuts are welded on the first embedded steel plate 7 along the periphery of the first plugging steel plate 53 of the fixed end 51, bolts are arranged on the nuts, and the fixed end is connected with the first embedded steel plate 7 through the bolts.
The first plugging steel plate 53 is welded with the outer wall of the steel pipe 9, a plurality of first rectangular stiffening plates 54 and second rectangular stiffening plates 57 are arranged on the inner side of the steel pipe 9 at one side of the fixed end, two mutually parallel edges of the second rectangular stiffening plates 57 are closely attached to the inner wall of the steel pipe 9 along the axis direction of the steel pipe and welded, and the other side of the second rectangular stiffening plates 57 is closely attached to the first plugging steel plate 53; one side of the first rectangular stiffening plate 54 is welded with the inner wall of the steel pipe 9, the other parallel side is welded with the second rectangular stiffening plate 57, and the third side of the first rectangular stiffening plate 57 is closely attached to the first plugging steel plate; a plurality of triangular rib plates 55 are arranged between the outer side of the steel pipe 9 at one end of the fixed end 51 and the first plugging steel plate 53 along the outer wall of the steel pipe 9, a right-angle side of each triangular rib plate 55 is welded with the first plugging steel plate 53, and the other right-angle side of each triangular rib plate 55 is welded with the outer wall of the steel pipe 9; the end part of the steel pipe at the connecting end is provided with a second blocking steel plate 56, the second blocking steel plate 56 is welded with the outer wall of the steel pipe 9, a plurality of triangular rib plates 55 are arranged between the second blocking steel plate 56 and the outer side of the steel pipe 9, a right-angle side of each triangular rib plate 55 is welded with the second blocking steel plate 56, and the other right-angle side of each triangular rib plate 55 is welded with the outer wall of the steel pipe 9; the second closure steel plate is provided with screw holes 58.
The connecting rod 6 is made of channel steel or angle steel, and the connecting rod 6 is connected with the connecting steel plate 10 by welding or bolts; when the bolt connection is adopted, screw holes are arranged at the two ends of the channel steel or the angle steel.
A construction method for a subway station foundation pit support structure comprises the following steps:
1. firstly, constructing an underground diaphragm wall 1 along the outer side of a subway station foundation pit, wherein a first embedded steel plate 7 and a second embedded steel plate 8 are arranged at a steel pipe supporting position of the underground diaphragm wall;
2. digging a first layer of soil, constructing a crown beam 2, and pouring or erecting a first support 3;
3. processing special steel pipe joints 5 and connecting rods 6;
4. digging a second layer of soil, erecting a second steel pipe support, wherein special steel pipe joints are arranged on one side of a foundation pit, installing a connecting rod 6 between the special steel pipe joints in the second steel pipe support, installing an inclined connecting rod 11 between a top connecting plate of the special steel pipe joints in the second steel pipe support and an underground continuous wall 1/crown beam 2, welding a plurality of nuts on a first embedded steel plate 7 along the periphery of a fixed end of the special steel pipe joints, arranging bolts on the nuts, and fixing a fixed end 51 of the steel pipe support with the first embedded steel plate 7 through the bolts;
5. digging a third layer of soil, erecting a third steel pipe support, and installing a connecting rod 6 between special steel pipe joints in the third steel pipe; installing an oblique connecting rod 11 between a special steel pipe joint top connecting plate and the underground continuous wall 1 in a third steel pipe support, welding a plurality of nuts on the first embedded steel plate 7 along the periphery of a steel pipe support fixing end, installing bolts on the nuts, and fixing the steel pipe support fixing end 51 with the first embedded steel plate 7 through the bolts;
6. digging a fourth layer of soil, and sequentially performing concrete pouring construction on the concrete cushion layer and the bottom plate;
7. dismantling a connecting rod 6 between the special steel pipe joints 5 in the third steel pipe support, an inclined connecting rod 11 between the special steel pipe joints 5 in the third steel pipe support and the underground continuous wall and the third steel pipe support 4;
8. pouring a side wall and a middle plate of the structure;
9. dismantling a connecting rod 6 between special steel pipe joints 5 in the two steel pipe supports, an inclined connecting rod 11 between the second steel pipe support and the underground continuous wall 1/crown beam 2 and the second steel pipe support;
10. and pouring the side wall and the top plate of the structure, and removing the first support.
Example 1:
the width of the station platform is 14m, the station is of a two-layer structure, and a double-column and double-span structure is adopted. The width of the foundation pit of the standard section is 22.9m, and the depth of the foundation pit is 19.2m. The foundation pit support structure adopts underground continuous walls and three supports, wherein the first support is a reinforced concrete support, and the second support and the third support are steel pipe supports. Temporary lattice columns are arranged in the middle of the foundation pit, the distance between the supports along the line direction is 6m, and the cross section size of the concrete support is 800mm multiplied by 600mm; the middle is provided with a concrete connecting beam, and the cross section size of the connecting beam is 500mm multiplied by 600mm; and connecting beams are arranged at the bottoms of the second and third steel pipe supports. The first concrete support center is 2.0m away from the ground, the first concrete support center is 6.5m away from the second steel pipe support center, the second steel pipe support center is 5.5m away from the third steel pipe support center, and the third steel pipe support center is 5.2m away from the bottom of the foundation pit. The diameter of the steel pipe is 609mm, and the wall thickness of the steel pipe is 14mm.
By adopting the foundation pit support structure, the underground diaphragm wall and three supports are adopted, wherein the first support is a reinforced concrete support, and the second support and the third support are steel pipe supports. The middle of the foundation pit is not provided with temporary lattice columns, the distance between the first reinforced concrete supports along the line direction is 6m, and the cross section size of the concrete supports is 800mm multiplied by 600mm; the first concrete support center is 2.0m away from the ground, the first concrete support center is 6.5m away from the second steel pipe support center, the second steel pipe support center is 5.5m away from the third steel pipe support center, and the third steel pipe support center is 5.2m away from the bottom of the foundation pit. The diameter of the steel pipe is 609mm, and the wall thickness of the steel pipe is 14mm.
The second and third steel pipe supports are provided with special steel pipe joints on the same side of the foundation pit, the lengths of the special steel pipe joints (the lengths between two end surfaces) are 5.0m, one end of each special steel pipe joint is a fixed end, and the other end of each special steel pipe joint is a connecting end; the end head of the fixed end is provided with a first sealing steel plate, the end head of the connecting end is provided with a second sealing steel plate, the thickness of the first sealing steel plate is 30mm, the outer diameter of the first sealing steel plate is 730mm, the thickness of the second sealing steel plate is 20mm, and the outer diameter of the second sealing steel plate is 730mm; the fixed end and the movable end of the steel pipe support are propped against a first embedded steel plate of the underground diaphragm wall, the thickness of the first embedded steel plate is 15mm, the size of the first embedded steel plate is 800mm multiplied by 800mm, 15 anchor bars are welded on one side, close to the concrete of the underground diaphragm wall, of the first embedded steel plate, the diameter of each anchor bar is 16mm, the length of each anchor bar is 500mm, and each anchor bar is anchored into the concrete of the underground diaphragm wall; after the steel pipe supports are arranged, a plurality of nuts are welded on the first embedded steel plate along the periphery of the first plugging steel plate, bolts are arranged on the nuts, and the fixed end is connected with the first embedded steel plate through the bolts; welding connecting steel plates with the size of 300mm (height) multiplied by 450mm (length along the axis of the steel pipe) and the thickness of 30mm at the two sides and the top of the steel pipe close to the connecting end; steel plate rings are sleeved on the steel pipes at two ends of the connecting steel plates, the outer diameter of each steel plate ring is 900mm, the inner diameter of each steel plate ring is 611mm, the thickness of each steel plate ring is 20mm, and the distance between the steel plate rings at the connecting ends and the connecting end faces is 200mm; the steel plate circular rings are welded with the outer wall of the steel pipe, two ends of the connecting steel plate are respectively welded with the closely-adhered steel plate circular rings, at least one connecting rod is connected between the left/right connecting steel plate of each special steel pipe section and the right/left connecting steel plate of the adjacent special steel pipe section through bolts, the connecting rod adopts channel steel, and the section of the channel steel has the height of 240mm and the width of 90mm; an oblique connecting rod is arranged between the top connecting steel plate of each special steel pipe joint and the underground continuous wall, the oblique connecting rod adopts two angle steels, the angle steels are positioned at two sides of the top connecting steel plate, one side of each angle steel is arranged in parallel with the connecting steel plate, and the section size of each angle steel is 125mm multiplied by 12mm; the length of the inclined connecting rod on the second steel pipe support is 6700mm, the included angle between the inclined connecting rod and the axis of the steel pipe is 45 degrees, the second embedded steel plate corresponding to the inclined connecting rod is arranged on the underground continuous wall, and the center of the second embedded steel plate is 5120mm away from the center line of the second steel pipe support; the length of angle steel of the upper inclined connecting rod of the third steel pipe support is 6188mm, the included angle between the angle steel and the axis of the steel pipe is 40 degrees, and a second embedded steel plate corresponding to the angle steel is arranged on the underground continuous wall; the top connecting steel plate is welded with the oblique connecting rod, the oblique connecting rod is welded with a second embedded steel plate on the underground continuous wall, the second embedded steel plate is positioned right above the steel pipe support, and the center of the second embedded steel plate is 4378mm away from the center line of the third steel pipe support; the second pre-buried steel plate has the dimensions of 400mm multiplied by 15mm, 9 steel bars are welded on the back surface (the contact surface with the underground continuous wall) of the second pre-buried steel plate, the diameter of each steel bar is 20mm, the length of each steel bar is 600mm, and the steel bars and the steel plates are subjected to plug welding.
The first plugging steel plate is welded with the outer wall of the steel pipe, a plurality of first rectangular stiffening plates and second rectangular stiffening plates are arranged on the inner side of the steel pipe close to one side of the fixed end, the size of the first rectangular stiffening plates is 288mmm multiplied by 400mm multiplied by 15mm, and the size of the second rectangular stiffening plates is 578mmm multiplied by 400mm multiplied by 15mm; two mutually parallel edges (the side length is 400 mm) of the second rectangular stiffening plate are closely attached to the inner wall of the steel pipe along the axis direction of the steel pipe and welded, and the other edge (the side length is 578 mm) of the second rectangular stiffening plate is closely attached to the first plugging steel plate; one side (side length 400 mm) of the first rectangular stiffening plate is welded with the inner wall of the steel pipe, the other parallel side (side length 400 mm) is welded with the middle part of the second rectangular stiffening plate, and one side (side length 288 mm) of the first rectangular stiffening plate is closely attached to the first plugging steel plate; a plurality of triangular rib plates are arranged between the outer side of the steel pipe and the first plugging steel plate along the outer wall of the steel pipe, and the sizes of the rib plates are 50mm multiplied by 12mm; a right-angle side of the triangular rib plate is welded with the first plugging steel plate, and the other right-angle side of the triangular rib plate is welded with the outer wall of the steel pipe.
The second plugging steel plate is welded with the outer wall of the steel pipe, a plurality of triangular rib plates are arranged between the second plugging steel plate and the outer side of the steel pipe, and the size of each rib plate is 50mm multiplied by 12mm; a right-angle side of the triangular rib plate is welded with the second plugging steel plate, and the other right-angle side of the triangular rib plate is welded with the outer wall of the steel pipe; 16 screw holes (the distance between the center of each screw hole and the center of the steel pipe is 338 mm) are uniformly formed in the periphery of the second plugging steel plate along the periphery of the plugging steel plate, and the diameter of each screw hole is 26mm.
The connecting rod is connected with the left/right connecting steel plates by bolts, screw holes are formed in two ends of the channel steel, the positions of long holes in two ends of the channel steel correspond to the positions of the screw holes of the connecting steel plates, the left/right connecting steel plates are provided with 4 screw hole diameters, the screw hole diameters are 26mm, and the center distance between the screw holes is 120mm;
in this embodiment, the width of the foundation pit is 22.9m, the length of the special steel pipe section is 5.0m, the distance between the center of the connecting steel plate and the connecting end face is 500mm, l1=22.9m- (5.0 m-0.5 m) =18.4 m.
The underground continuous wall can be regarded as an immobile body, the top end of the inclined connecting rod is welded with a second embedded steel plate on the underground continuous wall, the bottom end of the inclined connecting rod is firmly welded with the connecting steel plate, the connecting steel plate is firmly welded with the steel pipe, the inclined connecting rod has larger rigidity along the axis of the inclined rod, and the steel pipe at the center point of the connecting steel plate can be regarded as a vertical immobile point; meanwhile, since the connecting rod is arranged between the steel pipe and the left/right steel pipe, the steel pipe connected with the center point of the steel plate can be regarded as a fixed point along the horizontal direction. Therefore, the horizontal and vertical constraints are applied to the steel pipe by the oblique connecting rod and the connecting rod, so that the calculated length of the steel pipe is reduced. L1=18.4m < 20m, so the rest steel pipe support section (foundation pit width-foundation pit special steel pipe section length-0.5 m) does not need to be provided with vertical lattice columns and longitudinal beams.
The stress principle of the subway station foundation pit support structure support of the embodiment is the same as that of tower crane columns (four angle steels, horizontal pull rods arranged at a certain distance along the vertical direction and a structural wall fixing rod).
Example 2:
the width of the station platform is 14m, the station is of a two-layer structure, and a double-column and double-span structure is adopted. The width of the foundation pit of the standard section is 22.9m, and the depth of the foundation pit is 19.2m. The foundation pit support structure adopts underground continuous walls and three supports, wherein the first support is a reinforced concrete support, and the second support and the third support are steel pipe supports. Temporary lattice columns are arranged in the middle of the foundation pit, the distance between the supports along the line direction is 6m, and the cross section size of the concrete support is 800mm multiplied by 600mm; the middle is provided with a concrete connecting beam, and the cross section size of the connecting beam is 500mm multiplied by 600mm; lattice column spacing along the line direction 6m; and connecting beams are arranged at the bottoms of the second and third steel pipe supports. The first concrete support center is 2.0m away from the ground, the first concrete support center is 6.5m away from the second steel pipe support center, the second steel pipe support center is 5.5m away from the third steel pipe support center, and the third steel pipe support center is 5.2m away from the bottom of the foundation pit. The diameter of the steel pipe is 609mm, and the wall thickness of the steel pipe is 14mm.
Referring to fig. 8, the foundation pit enclosure structure of the present invention is identical to that of embodiment 1 except for the different arrangement of the diagonal links. In the embodiment, an inclined connecting rod is arranged between the top connecting steel plate of each special steel pipe joint and the underground continuous wall, two angle steels are adopted for the inclined connecting rod, the section size of each angle steel is 125mm multiplied by 12mm, the angle steels are positioned on two sides of the top connecting steel plate, and an included angle is formed between each angle steel and the top connecting steel plate; the second embedded steel plate corresponding to the second steel pipe support is arranged on the underground diaphragm wall, the distance between the center of the second embedded steel plate and the center of the second steel pipe support is 5120mm, the second embedded steel plate corresponding to the third steel pipe support is arranged on the underground diaphragm wall, and the distance between the center of the second embedded steel plate and the center of the third steel pipe support is 4378mm; the second embedded steel plate is arranged above the top between the two steel pipe supports, the left-side angle steel of the top connecting steel plate is welded with the second embedded part above the left side of the top connecting steel plate, and the right-side angle steel of the top connecting steel plate is welded with the second embedded part above the right side of the top connecting steel plate; the oblique connecting rod is welded with a second embedded steel plate on the underground continuous wall/crown beam; the second embedded steel plate has the dimensions of 400mm multiplied by 15mm, 6 steel bars are welded on the back surface (the contact surface with the underground continuous wall) of the steel plate, the diameter of the steel bars is 20mm, the length of the steel bars is 600mm, and the steel bars and the steel plate are subjected to plug welding. The other components and connection relationships are the same as those of embodiment 1.
After adopting above-mentioned structure, this concrete embodiment produces beneficial effect does: according to the subway station foundation pit support and construction method, temporary lattice columns, lattice column foundation piles and connecting beams do not need to be constructed, resources are saved, and the excavation operation and the structure construction are facilitated.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a subway station foundation ditch building envelope supports which characterized in that: the underground continuous wall comprises an underground continuous wall, a reinforced concrete crown beam, a first support, a steel pipe support, a special steel pipe joint, a connecting rod, a first embedded steel plate, a second embedded steel plate, a steel pipe, a connecting steel plate, an inclined connecting rod and a steel plate circular ring; underground continuous walls are arranged around the foundation pit of the subway station, reinforced concrete crown beams are arranged at the top of the underground continuous walls, a plurality of first supports are arranged at intervals along the direction of a line, and the first supports are supported or fixed on the reinforced concrete crown beams; a plurality of steel pipe supports are arranged below the first support at intervals along the vertical direction, and each steel pipe support is provided with a plurality of steel pipe supports at intervals along the line direction; the special steel pipe joint is arranged on the same side of the foundation pit and is connected with the first embedded steel plate through bolts; the steel pipe is characterized in that steel plates are welded on the two sides and the top of the steel pipe, steel plate rings are sleeved on the steel pipe at the two ends of the steel plates, the steel plate rings are welded with the outer wall of the steel pipe, one end of each steel plate is welded with the steel plate rings, and at least one connecting rod is fixedly connected between the steel plates at the two sides of each special steel pipe section and the steel plates at the two sides of the adjacent special steel pipe section; an oblique connecting rod is arranged between the top connecting steel plate of each special steel pipe joint and the underground diaphragm wall or the reinforced concrete crown beam, the top connecting steel plate is welded with the oblique connecting rod, and the oblique connecting rod is welded with the second embedded steel plate on the underground diaphragm wall or the reinforced concrete crown beam.
2. The subway station foundation pit enclosure support of claim 1, wherein: the special steel pipe joint has the same length, one end of the special steel pipe joint is a fixed end, the other end of the special steel pipe joint is a connecting end, the end face of the fixed end is provided with a first blocking steel plate, and the end face of the connecting end is provided with a second blocking steel plate; the fixed end and the movable end of the steel pipe support are propped against a first embedded steel plate of the underground continuous wall; and a plurality of nuts are welded on the first embedded steel plate along the periphery of the first blocking steel plate of the fixed end, bolts are arranged on the nuts, and the fixed end is connected with the first embedded steel plate through the bolts.
3. The subway station foundation pit enclosure support of claim 1, wherein: the connecting rod is formed by adopting channel steel or angle steel, and the connecting rod is connected with the connecting steel plate by adopting welding or bolts; when the bolt connection is adopted, screw holes are arranged at the two ends of the channel steel or the angle steel.
4. The subway station foundation pit enclosure support of claim 2, wherein: the first plugging steel plate is welded with the outer wall of the steel pipe, a plurality of first rectangular stiffening plates and second rectangular stiffening plates are arranged on the inner side of the steel pipe at one side of the fixed end, two mutually parallel edges of the second rectangular stiffening plates are closely attached to the inner wall of the steel pipe along the axial direction of the steel pipe and are welded, and the other side of the second rectangular stiffening plates is closely attached to the first plugging steel plate; one side of the first rectangular stiffening plate is welded with the inner wall of the steel pipe, the other parallel side is welded with the second rectangular stiffening plate, and the third side of the first rectangular stiffening plate is closely attached to the first plugging steel plate; a plurality of triangular rib plates are arranged between the outer side of the steel pipe at one end of the fixed end and the first plugging steel plate along the outer wall of the steel pipe, a right-angle side of each triangular rib plate is welded with the first plugging steel plate, and the other right-angle side of each triangular rib plate is welded with the outer wall of the steel pipe; the end part of the steel pipe at the connecting end is provided with a second plugging steel plate, the second plugging steel plate is welded with the outer wall of the steel pipe, a plurality of triangular rib plates are arranged between the second plugging steel plate and the outer side of the steel pipe, a right-angle side of each triangular rib plate is welded with the second plugging steel plate, and the other right-angle side of each triangular rib plate is welded with the outer wall of the steel pipe; screw holes are formed in the second plugging steel plate.
5. The construction method of the subway station foundation pit support structure is characterized by comprising the following steps:
(1) Firstly, constructing an underground diaphragm wall along the outer side of a subway station foundation pit, wherein a first embedded steel plate and a second embedded steel plate are arranged at the supporting position of a steel pipe of the underground diaphragm wall;
(2) Digging a first layer of soil, constructing a crown beam, and pouring or erecting a first support;
(3) Processing special steel pipe joints and connecting rods;
(4) Digging a second layer of soil, erecting a second steel pipe support, wherein special steel pipe joints are arranged on one side of a foundation pit, installing connecting rods between the special steel pipe joints in the second steel pipe support, installing oblique connecting rods between a connecting plate at the top of the special steel pipe joint in the second steel pipe support and an underground continuous wall or a crown beam, welding a plurality of nuts on a first embedded steel plate along the periphery of a fixed end of the special steel pipe joint, arranging bolts on the nuts, and fixing the fixed end of the steel pipe support and the first embedded steel plate through the bolts;
(5) Digging a third layer of soil, erecting a third steel pipe support, and installing a connecting rod between special steel pipe joints in the third steel pipe; installing an oblique connecting rod between a connecting plate at the top of a special steel pipe joint in a third steel pipe support and an underground continuous wall, welding a plurality of nuts on the first embedded steel plate along the periphery of a fixed end of the steel pipe support, installing bolts on the nuts, and fixing the fixed end of the steel pipe support with the first embedded steel plate through the bolts;
(6) Digging a fourth layer of soil, and sequentially performing concrete pouring and construction on the concrete cushion layer and the bottom plate;
(7) Dismantling a connecting rod between the special steel pipe joints in the third steel pipe support, and an oblique connecting rod between the special steel pipe joints in the third steel pipe support and the underground continuous wall and the third steel pipe support;
(8) Pouring the side wall and the middle plate of the structure;
(9) Dismantling a connecting rod between special steel pipe joints in the two steel pipe supports, an inclined connecting rod between the second steel pipe support and an underground continuous wall or a crown beam and the second steel pipe support;
(10) And pouring the side wall and the top plate of the structure, and dismantling the first support.
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| CN109610473A (en) * | 2018-12-26 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of construction method of the large-scale pool structure foundation pit supporting system of municipal administration |
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