A subway cover-excavation inverse structure and construction method thereof

Abstract

The present invention discloses a subway cover inverted excavation structure and a construction method thereof. The subway cover inverted excavation structure includes a support pile, a support plate is fixedly connected to the top of the support pile, a fixing hole is provided on the surface of the support plate, a connecting piece is threadedly connected to the inner wall of the fixing hole, the surface of the connecting piece is threadedly connected to the inner cavity of the top plate, a sand outlet is provided on the surface of the top plate, a guardrail is fixedly connected to the top of the top plate, and a first connecting plate is bolted to the surface of the support pile. The present invention provides a connecting piece to make the connection between the support pile and the top plate more stable, so that the support pile does not tilt or misalign when in use; the present invention increases the support contact area of ​​the top plate, thereby increasing the support load of the top plate, strengthening the load capacity of the entire reinforcement system, and providing sufficient support force to ensure construction safety even if there is large machinery operating above the top plate.

Description

Technical Field

[0001] The invention relates to the technical field of subway cover and excavation, and in particular to a subway cover and excavation inverse structure and a construction method thereof. Background Art

[0002] The cover-excavation reverse method is to first build the retaining structure and intermediate piles of the foundation pit from the ground surface. Like the cover-excavation forward method, the retaining structure of the foundation pit mostly adopts underground continuous walls or curtain piles, and the intermediate support mostly uses the intermediate columns of the main structure itself to reduce the project cost. Then the surface soil can be excavated to the ground elevation of the top plate of the main structure, and the unexcavated soil is used as the soil mold to cast the top plate. The top plate can be used as a strong horizontal brace to prevent the retaining structure from deforming into the foundation pit. After backfilling, the road will be restored and traffic will be resumed. In order to transport the excavated soil and sand, temporary holes need to be set in multiple places on the top plate. If too many temporary holes are opened, the strength of the top plate will be affected. Summary of the invention

[0003] The object of the present invention is to provide a subway cover-excavation inverted structure to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A subway cover excavation structure includes supporting piles, the top of the supporting piles is fixedly connected to a supporting plate, the surface of the supporting plate is provided with fixing holes, the inner wall of the fixing hole is threadedly connected to a connecting piece, the surface of the connecting piece is threadedly connected to the inner cavity of a top plate, the surface of the top plate is provided with a sand outlet, the top of the top plate is fixedly connected to a guardrail, the surface of the supporting piles is bolted to a first connecting plate, the surface of the supporting piles is bolted to a second connecting plate, and the bottom of the supporting piles is fixedly connected to a chassis.

[0006] The bottom of the chassis is fixedly connected to a base, the bottom of the inner cavity of the base is fixedly connected to a fixing pile, the surface of the fixing pile close to the top is fixedly connected to a driving gear through a bearing, the inner ring of the driving gear is fixedly connected to a fixing block, the inner wall of the fixing block is fixedly connected to a positioning protrusion, the surface of the driving gear is meshed with a rotating toothed disk, the inner ring of the rotating toothed disk is meshed with a rotating screw, the bottom of the rotating screw is fixedly connected to a rotating pile, the top of the rotating screw is fixedly connected to an anti-slip pile, the surface of the base is fixedly connected to a rotating cover plate through a fixed rotating shaft, the surface of the base is fixedly connected to a screw box, the inner cavity of the screw box is provided with a limiting groove, the top of the screw box is rotatably connected to a screw cover through a central rotating shaft, and the surface of the rotating toothed disk is fixedly connected to a gear rack through a bearing.

[0007] Preferably, the number of the fixing holes is four and they are evenly spaced and distributed on the surface of the support plate, and the support pile is located at the center of the bottom of the support plate.

[0008] Preferably, the number of the support piles is four and they are evenly spaced and distributed around the sand outlet, and the support piles are made of I-beams.

[0009] Preferably, the first connecting plate and the second connecting plate form an angle of degrees, and the number of the first connecting plate and the number of the second connecting plates are two, and the material of the first connecting plate and the second connecting plate is alloy structural steel.

[0010] Preferably, the base is provided with a groove matched with the chassis, the rotating screw rod passes through the inner cavity of the base, and the limiting groove is matched with the rotating screw rod.

[0011] Preferably, the bottom of the gear rack is fixedly connected to the bottom of the inner cavity of the base, and the gear rack is in the shape of a hollow cylinder.

[0012] The present invention also provides a construction method for a subway cover-excavation inverted structure, which specifically comprises the following steps:

[0013] First, prepare 4 supporting piles, install a chassis at the bottom of the supporting piles, install a base at the bottom of the chassis, install a fixed pile at the bottom of the base, and install a driving gear on the surface of the fixed pile near the top through a bearing, wherein the inner ring of the driving gear is installed with a fixed block, and a positioning protrusion is installed on the inner wall of the fixed block. A rotating toothed disc is meshed and connected on the surface of the driving gear, wherein a rotating screw is meshed and installed on the inner ring of the rotating toothed disc, a rotating pile is installed at the bottom of the rotating screw, and an anti-slip pile is installed on the top of the rotating screw, a rotating cover plate is installed on the surface of the base through a fixed rotating shaft, and a screw box is installed on the surface of the base, wherein a limiting groove is provided in the inner cavity of the screw box, wherein the top of the screw box is rotatably connected with a screw cover through a central rotating shaft, and a gear rack is fixedly connected to the surface of the rotating toothed disc through a bearing;

[0014] A support plate is installed on the top of the support pile, and fixing holes are opened on the surface of the support plate. The number of the fixing holes is four and they are evenly spaced on the surface of the support plate. The support pile is located at the center of the bottom of the support plate, and a connector is threadedly connected to the inner wall of the fixing hole.

[0015] Second, after completing the first step, install the top plate on the ground to be constructed, open and design a sand outlet on the top plate, construct guardrails around the sand outlet and on the top plate, and after the guardrails are constructed, start digging the sand and gravel below the sand outlet. After digging out a certain space, place the support piles installed in the first step below the top plate and distribute them around the sand outlet at equal distances, then connect the support plate to the top plate through a connector, and the surface of the connector is threadedly connected to the inner cavity of the top plate;

[0016] Then, a first connecting plate is connected to the surface bolts at the longitudinal middle position of the support pile 1, and a second connecting plate is connected to the surface bolts at the longitudinal middle position of the support pile. The first connecting plate and the second connecting plate form a 90-degree angle, and the number of the first connecting plate and the number of the second connecting plates are both two;

[0017] Third, after completing the second step, start excavating the sand and gravel around the sand outlet under the top plate. After clearing a certain space, start constructing another subway cover excavation reverse structure according to construction requirements, and continue to excavate the sand and gravel in other spaces; when the underground project construction is completed, dismantle the subway cover excavation reverse structure and reuse it.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a connecting piece to make the connection between the support pile and the top plate more stable, so that the support pile will not tilt or misalign when in use;

[0020] 2. The present invention increases the supporting contact area of ​​the top plate by providing supporting piles and supporting plates, thereby increasing the supporting load of the top plate and strengthening the load capacity of the entire reinforcement system. Even if there is a large machine operating above the top plate, sufficient supporting force can be provided to ensure construction safety;

[0021] 3. The guardrail provided in the present invention prevents workers from falling from the sand outlet to the work site when the sand and gravel are transported out of the work site from the sand outlet;

[0022] 4. The present invention connects the support piles to the ground through the provided base, so that the support piles do not shift during use. Through the provided active gear, the rotating toothed disc is rotated with the cooperation of a wrench, thereby moving the rotating screw rod. Through the provided rotating screw rod, the rotating piles can be moved up and down, thereby firmly connecting the base to the ground. Through the provided gear rack, the rotating toothed disc does not shift during operation, thereby not affecting the use of this subway cover excavation reverse structure.

[0023] 5. The subway cover excavation inverse structure construction method provided by the present invention is novel in design. A subway cover excavation inverse structure is integrated into the process of underground engineering construction, which greatly improves the safety of the underground engineering construction process. Moreover, the method is gradually assembled as the underground engineering construction reaches different stages. The sand and gravel excavation work and the construction of the subway cover excavation inverse structure can be carried out simultaneously without delaying the construction period, which greatly improves the construction efficiency and reduces the construction cost.

[0024] 6. The present invention is a detachable structure. After the underground engineering construction is completed, it can be dismantled and reused, which greatly reduces the construction cost and improves the utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 2 This is an enlarged structural schematic diagram of location A of the present invention;

[0027] Figure 3 It is a schematic diagram of the top plate cross-sectional structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the top view of the base structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the top view of the driving gear of the present invention.

[0030] In the figure: 1 supporting pile, 2 supporting plate, 3 fixing hole, 4 connecting piece, 5 top plate, 6 sand outlet, 7 guardrail, 8 first connecting plate, 9 second connecting plate, 10 chassis, 11 base, 12 driving gear, 13 fixing block, 14 positioning protrusion, 15 rotating gear plate, 16 rotating screw, 17 rotating pile, 18 anti-slip pile, 19 fixed rotating shaft, 20 rotating cover plate, 21 screw box, 22 limiting groove, 23 central rotating shaft, 24 screw cover, 25 gear rack, 26 fixing pile. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1-5A subway cover excavation reverse structure includes a support pile 1. The number of the support piles 1 is four and they are evenly spaced around a sand outlet 6. The material of the support piles 1 is I-beam. By setting the support piles 1, the support points of the top plate 5 are increased, thereby increasing the strength of the top plate 5. The top of the support pile 1 is fixedly connected with a support plate 2. The surface of the support plate 2 is provided with fixing holes 3. The number of the fixing holes 3 is four and they are evenly spaced on the surface of the support plate 2. The support pile 1 is located at the center of the bottom of the support plate 2. The inner wall of the fixing hole 3 is threadedly connected with a connector 4. The connector 4 is provided to make the connection between the support pile 1 and the top plate 5 more stable, so that the support pile 1 can be used. It is not tilted, and the surface of the connecting member 4 is threadedly connected to the inner cavity of the top plate 5. A sand outlet 6 is opened on the surface of the top plate 5. A guardrail 7 is fixedly connected to the top of the top plate 5. The guardrail 7 is set so that when sand and gravel are transported out of the working point from the sand outlet 6, the workers will not fall from the sand outlet 6 to the working point. The surface of the support pile 1 is bolted to the first connecting plate 8, and the first connecting plate 8 forms a 90-degree angle with the second connecting plate 9. The number of the first connecting plate 8 and the second connecting plate 9 are both two, and the material of the first connecting plate 8 and the second connecting plate 9 is alloy structural steel. The surface of the support pile 1 is bolted to the second connecting plate 9, and the bottom of the support pile 1 is fixedly connected to the chassis 10.

[0034] The bottom of the chassis 10 is fixedly connected to a base 11, and the base 11 is provided with a groove adapted to the chassis 10. The support pile 1 is connected to the ground through the provided base 11, so that the support pile 1 does not shift during use. The bottom of the inner cavity of the base 11 is fixedly connected to a fixed pile 26, and the surface of the fixed pile 26 close to the top is fixedly connected to a driving gear 12 through a bearing. The rotating toothed disc 15 is rotated by the cooperation of a wrench through the provided driving gear 12, and then the rotating screw 16 is moved. The inner ring of the driving gear 12 is fixedly connected to a fixed block 13, and the inner wall of the fixed block 13 is fixedly connected to a positioning protrusion 14. The surface of the driving gear 12 is meshed with a rotating toothed disc 15, and the inner ring of the rotating toothed disc 15 is meshed with a rotating screw 16. The rotating screw 16 runs through the inner cavity of the base 11, and the rotating pile 17 can be rotated through the provided rotating screw 16. The base 11 is moved up and down, so that the base 11 is firmly connected to the ground. The bottom of the rotating screw rod 16 is fixedly connected to a rotating pile 17, and the top of the rotating screw rod 16 is fixedly connected to an anti-dropping pile 18. The surface of the base 11 is fixedly connected to a rotating cover plate 20 through a fixed rotating shaft 19. The surface of the base 11 is fixedly connected to a screw box 21. The inner cavity of the screw box 21 is provided with a limiting groove 22, and the limiting groove 22 is adapted to the rotating screw rod 16. The top of the screw box 21 is rotatably connected to a screw cover 24 through a central rotating shaft 23. The surface of the rotating toothed disc 15 is fixedly connected to a gear rack 25 through a bearing. The bottom of the gear rack 25 is fixedly connected to the bottom of the inner cavity of the base 11, and the gear rack 25 is shaped like a hollow cylinder. Through the arrangement of the gear rack 25, the rotating toothed disc 15 does not shift during operation, thereby not affecting the use of this subway cover excavation reverse structure.

[0035] Example 2

[0036] A construction method for a subway cover-excavation inverted structure comprises the following steps:

[0037] First, as Figure 1-Figure 5 As shown, 4 supporting piles are prepared, a chassis 10 is installed at the bottom of the supporting pile 1, a base 11 is installed at the bottom of the chassis 10, a fixed pile 26 is installed at the bottom of the base 11, a driving gear 12 is installed and connected to the surface of the fixed pile 26 near the top through a bearing, wherein the inner ring of the driving gear 12 is installed and connected to the fixed block 13, and the inner wall of the fixed block 13 is installed with a positioning protrusion 14, and a rotating toothed disc 15 is connected to the surface of the driving gear 12 through meshing, wherein the inner ring of the rotating toothed disc 15 is meshingly installed with a rotating screw 16, a rotating pile 17 is installed at the bottom of the rotating screw 16, and an anti-dropping pile 18 is installed at the top of the rotating screw 16, a rotating cover plate 20 is installed on the surface of the base 11 through a fixed rotating shaft 19, and a screw box 21 is installed on the surface of the base 11, wherein the inner cavity of the screw box 21 is provided with a limiting groove 22, wherein the top of the screw box 21 is rotatably connected with a screw cover 24 through a central rotating shaft 23, and a gear frame 25 is fixedly connected to the surface of the rotating toothed disc 15 through a bearing;

[0038] A support plate 2 is installed on the top of the support pile 1, and a fixing hole 3 is opened on the surface of the support plate 2. The number of the fixing holes 3 is four and they are evenly spaced on the surface of the support plate 2. The support pile 1 is located at the center of the bottom of the support plate 2, and a connector 4 is threadedly connected to the inner wall of the fixing hole 3.

[0039] Second, after completing the first step, the top plate 5 is installed on the ground to be constructed, a sand outlet 6 is opened on the top plate 5, and a guardrail 7 is constructed around the sand outlet 6 and on the top plate 5. After the guardrail 7 is constructed, the sand and gravel below the sand outlet 6 are excavated. After a certain space is excavated, the support piles 1 installed in the first step are placed below the top plate 5 and are distributed around the sand outlet 6 at equal distances. Then, the support plate 2 is connected to the top plate 5 through the connector 4, and the surface of the connector 4 is threadedly connected to the inner cavity of the top plate 5.

[0040] Then, a first connecting plate 8 is connected to the surface bolts at the longitudinal middle position of the support pile 1, and a second connecting plate 9 is connected to the surface bolts at the longitudinal middle position of the support pile 1. The first connecting plate 8 and the second connecting plate 9 form a 90-degree angle, and the number of the first connecting plate 8 and the number of the second connecting plate 9 are both two;

[0041] Third, after completing the second step, start to excavate the sand and gravel around the sand outlet 6 under the top plate 5. After excavating a certain space, start construction of another subway cover excavation inverse structure 5 according to construction requirements, and continue to excavate the sand and gravel in other spaces; when the underground engineering construction is completed, dismantle the subway cover excavation inverse structure 5 and reuse it.

[0042] Working principle: When a subway cover excavation reverse structure is used, after the support pile 1 is placed around the sand outlet 6, it is engaged with the positioning protrusion 14 through a wrench, and the wrench is rotated to rotate the driving gear 12, thereby rotating the rotating toothed disc 15, and then rotating the rotating screw 16, and driving the rotating pile 17 to move up and down, so that the base 11 is connected to the ground, and the connecting piece 4 is screwed into the fixing hole 3, so that the support plate 2 and the top plate 5 are fixedly connected, and then the support pile 1 is firmly connected to the top plate, and the top of the support pile 1 is firmly connected to the top plate 5 through the setting of the connecting piece 4, thereby increasing the strength of the top plate 5, and the bottom of the base 11 is firmly connected to the ground through the setting of the rotating pile 17, thereby increasing the contact area between the support pile 1 and the ground and reducing the damage to the ground in the process of supporting the top plate 5.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for a subway cover excavation inversion structure, the subway cover excavation inversion structure comprising support piles (1), characterized in that: The top of the support pile (1) is fixedly connected to a support plate (2), a surface of the support plate (2) is provided with fixing holes (3), the number of the fixing holes (3) is four and they are evenly spaced and distributed on the surface of the support plate (2), and the support pile (1) is located at the center of the bottom of the support plate (2); The inner wall of the fixing hole (3) is threadedly connected to a connecting piece (4), the surface of the connecting piece (4) is threadedly connected to the inner cavity of the top plate (5), the surface of the top plate (5) is provided with a sand outlet (6), the number of the supporting piles (1) is four, and they are evenly spaced and distributed around the sand outlet (6), and the material of the supporting piles (1) is I-beam; The top of the top plate (5) is fixedly connected to a guardrail (7), the surface of the support pile (1) is bolted to a first connection plate (8), the surface of the support pile (1) is bolted to a second connection plate (9), and the bottom of the support pile (1) is fixedly connected to a chassis (10); the first connection plate (8) and the second connection plate (9) form an angle of 90 degrees, and the number of the first connection plate (8) and the number of the second connection plate (9) are both two, and the material of the first connection plate (8) and the second connection plate (9) is alloy structural steel; The bottom of the chassis (10) is fixedly connected to a base (11), the bottom of the inner cavity of the base (11) is fixedly connected to a fixing pile (26), the surface of the fixing pile (26) close to the top is fixedly connected to a driving gear (12) via a bearing, the inner ring of the driving gear (12) is fixedly connected to a fixing block (13), the inner wall of the fixing block (13) is fixedly connected to a positioning protrusion (14), the surface of the driving gear (12) is meshed with a rotating toothed disc (15), the inner ring of the rotating toothed disc (15) is meshed with a rotating screw (16), and the rotating screw ( The bottom of the base (16) is fixedly connected to a rotating pile (17), the top of the rotating screw (16) is fixedly connected to an anti-dropping pile (18), the surface of the base (11) is fixedly connected to a rotating cover plate (20) via a fixed rotating shaft (19), the surface of the base (11) is fixedly connected to a screw box (21), the inner cavity of the screw box (21) is provided with a limiting groove (22), the top of the screw box (21) is rotatably connected to a screw cover (24) via a central rotating shaft (23), and the surface of the rotating toothed disc (15) is fixedly connected to a gear rack (25) via a bearing; The base (11) is provided with a groove adapted to fit the chassis (10); the rotating screw (16) passes through the inner cavity of the base (11); and the limiting groove (22) is adapted to fit the rotating screw (16); The bottom of the gear rack (25) is fixedly connected to the bottom of the inner cavity of the base (11), and the gear rack (25) is in the shape of a hollow cylinder; The construction method of the subway cover-excavation inverted structure specifically includes the following steps: First, four supporting piles (1) are prepared, a chassis (10) is installed at the bottom of the supporting piles (1), a base (11) is installed at the bottom of the chassis (10), a fixing pile (26) is installed at the bottom of the base (11), a driving gear (12) is connected to the surface of the fixing pile (26) near the top through a bearing, wherein the inner ring of the driving gear (12) is connected to a fixing block (13), and a positioning protrusion (14) is installed on the inner wall of the fixing block (13), and a rotating gear (15) is connected to the surface of the driving gear (12) through meshing, wherein the inner ring of the rotating gear (15) is meshingly arranged. A rotating screw (16) is installed, a rotating pile (17) is installed at the bottom of the rotating screw (16), an anti-drop pile (18) is installed at the top of the rotating screw (16), a rotating cover plate (20) is installed on the surface of the base (11) through a fixed rotating shaft (19), a screw box (21) is installed on the surface of the base (11), wherein the inner cavity of the screw box (21) is provided with a limiting groove (22), wherein the top of the screw box (21) is rotatably connected to a screw cover (24) through a central rotating shaft (23), and a gear rack (25) is fixedly connected to the surface of the rotating gear disc (15) through a bearing; A support plate (2) is installed on the top of the support pile (1), a fixing hole (3) is opened on the surface of the support plate (2), the number of the fixing holes (3) is four and they are evenly spaced on the surface of the support plate (2), the support pile (1) is located at the center of the bottom of the support plate (2), and a connecting piece (4) is threadedly connected to the inner wall of the fixing hole (3); Second, after completing the first step, the top plate (5) is installed on the ground to be constructed, a sand outlet (6) is opened on the top plate (5), and a guardrail (7) is constructed around the sand outlet (6) and on the top plate (5). After the guardrail (7) is constructed, the sand and gravel below the sand outlet (6) are excavated. After a certain space is excavated, the support piles (1) installed in the first step are placed below the top plate (5) and distributed around the sand outlet (6) at equal distances. Then, the support plate (2) is connected to the top plate (5) through the connecting piece (4), and the surface of the connecting piece (4) is threadedly connected to the inner cavity of the top plate (5); Then, a first connecting plate (8) is connected to the surface bolts at the longitudinal middle position of the support pile (1), and a second connecting plate (9) is connected to the surface bolts at the longitudinal middle position of the support pile (1), the first connecting plate (8) and the second connecting plate (9) form an angle of 90 degrees, and the number of the first connecting plate (8) and the number of the second connecting plate (9) are both two; Third, after completing the second step, the excavation of sand and gravel around the sand outlet (6) below the top plate (5) is started. After a certain space is excavated, another subway cover excavation reverse structure is started according to the construction requirements, and the sand and gravel in other spaces are continued to be excavated; when the underground engineering construction is completed, the subway cover excavation reverse structure is dismantled and reused.

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