CN216765948U

CN216765948U - Flood prevention cofferdam structure

Info

Publication number: CN216765948U
Application number: CN202220441996.XU
Authority: CN
Inventors: 邵士赛
Original assignee: Shanghai Chongming Water Conservancy Engineering Co ltd
Current assignee: Shanghai Chongming Water Conservancy Engineering Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-06-17
Anticipated expiration: 2032-03-01

Abstract

The application discloses a flood prevention cofferdam structure, which relates to the technical field of cofferdams and comprises bedrock, a river bed and an earth-rock cofferdam, wherein the earth-rock cofferdam is laid at the top of the river bed, pile holes are formed in the earth-rock cofferdam, cast-in-place piles are cast in the pile holes, and an impervious wall is cast in the earth-rock cofferdam outside the cast-in-place piles; this application is through the earth and rockfill cofferdam, the concrete cofferdam, the cooperation setting of holding tank and geomembrane isotructure, the holding tank is seted up in the inboard of the inside cut-off wall of pouring of earth and rockfill cofferdam and concrete cofferdam, the geomembrane is installed inside the holding tank, the bending is the corrugate about the geomembrane, when the concrete cofferdam produces and subsides or when the displacement, ripple on the geomembrane can expand under the effect of the traction force that produces when subsiding or the displacement, the power of tearing that causes the geomembrane when reducing the concrete cofferdam and subsiding, thereby furthest avoided subsiding and deformation in-process, the geomembrane produces the fracture because of dragging, thereby the water-proof effects of geomembrane has been promoted.

Description

Flood prevention cofferdam structure

Technical Field

The application relates to the technical field of cofferdams, in particular to a flood prevention cofferdam structure.

Background

The cofferdam is a temporary enclosure structure constructed for constructing permanent water conservancy facilities in the water conservancy project construction. The cofferdam has the functions of preventing water and soil from entering the building position of the building so as to drain water in the cofferdam, excavate a foundation pit and build the building. The cofferdam is mainly used in hydraulic buildings in general, and the cofferdam is dismantled after being used up except for being used as a part of a formal building. The cofferdam height is higher than the highest water level that may occur during construction.

The existing cofferdam is generally formed by combining an earth rock cofferdam and a concrete cofferdam, a weir body above a long water level in a construction period is usually filled with a geomembrane for seepage prevention, the structure of the cofferdam is unstable when the cofferdam is just built, sedimentation or deformation can be generated, and the geomembrane is easy to break due to pulling in the sedimentation and deformation processes, so that the waterproof effect of the geomembrane is greatly reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the conventional cofferdam is generally formed by combining an earth rock cofferdam and a concrete cofferdam, the dam body above the long water level in the construction period is usually filled with a geomembrane for seepage prevention, the structure of the cofferdam is unstable when the cofferdam is just built and can be settled or deformed, and the geomembrane is easy to break due to pulling in the settling and deforming processes, so that the waterproof effect of the geomembrane is greatly reduced, the application provides a flood prevention cofferdam structure.

The application provides a flood prevention cofferdam structure adopts following technical scheme:

a flood prevention cofferdam structure comprises bedrock, a riverbed and an earth-rock cofferdam, wherein the earth-rock cofferdam is laid on the top of the riverbed, pile holes are formed in the earth-rock cofferdam, filling piles are poured in the pile holes, a cut-off wall is poured in the earth-rock cofferdam on the outer side of the filling piles, the bottoms of the filling piles and the cut-off wall all penetrate through the riverbed, the bottoms of the filling piles and the cut-off wall are connected with the bedrock, a concrete cofferdam is poured on the top of the earth-rock cofferdam, a holding tank is formed in the top of the concrete cofferdam and penetrates through the concrete cofferdam, the earth-rock cofferdam and the riverbed, a geomembrane is arranged in the concrete cofferdam, and the outer side of the geomembrane is attached to the cut-off wall.

Optionally, the surface of basement rock digs and is equipped with the mounting groove, the bored concrete pile with the cut-off wall bottom all is located inside the mounting groove, the bored concrete pile with the cut-off wall bottom with the mounting groove cavity inner wall laminates each other.

Optionally, an impact-resistant column is built on the outer side of the impervious wall inside the earth-rock cofferdam, the bottom of the impact-resistant column penetrates through the earth-rock cofferdam and the riverbed, and the impact-resistant column is attached to the bottom of the bedrock.

Optionally, the cut-off wall with be equipped with the bracket between the post shocks resistance, the both ends of bracket respectively with the cut-off wall with post fixed connection shocks resistance, the quantity of bracket is a plurality of, and is a plurality of the bracket is followed the cut-off wall with the length direction equidistance of post shocks resistance is arranged.

Optionally, the concrete cofferdam is of a prismoid structure, the width of the bottom of the concrete cofferdam is greater than the width of the top of the concrete cofferdam, and the inclination angle of the outer side of the concrete cofferdam is greater than the inclination angle of the inner side of the concrete cofferdam.

Optionally, connecting plates are arranged at two ends of the geomembrane, the connecting plates located at the top end of the geomembrane are fixedly connected with the concrete cofferdam, and the connecting plates located at the bottom end of the geomembrane are buried in the bedrock at the bottom of the riverbed.

Optionally, a filling block is filled in a gap between the geomembrane and the inner wall of the accommodating groove, and the filling block may be foam particles.

Optionally, the two sides of the earth-rock cofferdam are both provided with clamping plates, the clamping plates are provided with connecting thread steels, the connecting thread steels penetrate through the earth-rock cofferdam, and the two ends of the connecting thread steels are clamped with the clamping plates.

In conclusion, the beneficial effects of the application are as follows:

this application is through the earth and rockfill cofferdam, the concrete cofferdam, the cooperation setting of holding tank and geomembrane isotructure, the holding tank is seted up in the inboard of the inside cut-off wall of pouring of earth and rockfill cofferdam and concrete cofferdam, the geomembrane is installed inside the holding tank, the bending is the corrugate about the geomembrane, when the concrete cofferdam produces and subsides or when the displacement, ripple on the geomembrane can expand under the effect of the traction force that produces when subsiding or the displacement, the power of tearing that causes the geomembrane when reducing the concrete cofferdam and subsiding, thereby furthest avoided subsiding and deformation in-process, the geomembrane produces the fracture because of dragging, thereby the water-proof effects of geomembrane has been promoted.

Drawings

FIG. 1 is a schematic cross-sectional view of the present application in its entirety;

fig. 2 is a schematic view of the connection structure of the geomembrane with the earth-rock cofferdam and the concrete cofferdam of the present application;

FIG. 3 is a schematic view of the connection structure of the holding plate and the earth-rock cofferdam of the present application;

description of reference numerals: 1. bedrock; 2. a riverbed; 3. an earth-rock cofferdam; 4. filling piles; 5. a cut-off wall; 6. an impact resistant post; 7. a bracket; 8. a concrete cofferdam; 9. accommodating grooves; 10. a geomembrane; 11. a filling layer; 12, a connecting plate; 13. a clamping plate; 14. connecting the threaded rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

Referring to fig. 1-3, a flood control cofferdam structure comprises bedrock 1 at the bottom of a ground, a river bed 2 on the surface of the bedrock 1 and an earth-rock cofferdam 3 for blocking river water, wherein the earth-rock cofferdam 3 is laid on the top of the river bed 2, the cross section of the earth-rock cofferdam 3 is of a frustum pyramid structure, pile holes are formed in the earth-rock cofferdam 3 and penetrate through the earth-rock cofferdam 3 and the river bed 2, filling piles 4 for supporting the earth-rock cofferdam 3 are poured in the pile holes, a seepage-proofing wall 5 for preventing river water from seeping in is poured in the earth-rock cofferdam 3 outside the filling piles 4, mounting grooves are dug in the outer surface of the bedrock 1, the bottoms of the filling piles 4 and the seepage-proofing wall 5 are both positioned in the mounting grooves, the bottoms of the filling piles 4 and the seepage-proofing wall 5 are mutually attached to the inner wall of the mounting groove cavity, and the river water at the bottom of the river bed 2 is blocked. An anti-impact column 6 is poured outside the impervious wall 5 inside the earth-rock cofferdam 3, the bottom of the anti-impact column 6 penetrates through the earth-rock cofferdam 3 and the riverbed 2, the anti-impact column 6 is attached to the bottom of the bedrock 1, a bracket 7 is arranged between the impervious wall 5 and the anti-impact column 6, two ends of the bracket 7 are fixedly connected with the impervious wall 5 and the anti-impact column 6 respectively, the number of the brackets 7 is multiple, and the plurality of brackets 7 are arranged at equal intervals along the length direction of the impervious wall 5 and the anti-impact column 6. Concrete cofferdam 8 that is used for carrying on the reinforcing effect is pour at 3 tops in earth-rock cofferdam, holding tank 9 has been seted up at 8 tops in concrete cofferdam, holding tank 9 runs through concrete cofferdam 8, earth-rock cofferdam 3 and riverbed 2, the inside geomembrane 10 that is equipped with in concrete cofferdam 8, be equipped with a plurality of ripples on the geomembrane 10, the geomembrane 10 outside is laminated with impervious wall 5 mutually, when concrete cofferdam 8 is pour and is accomplished the back and produce and subside or when shifting, the ripple of setting on the geomembrane 10 can be expanded under the effect of the traction force that produces when subsiding or shifting, reduce the power of tearing that causes geomembrane 10 when concrete cofferdam 8 subsides, thereby avoided subsiding and deformation in-process as far as possible, geomembrane 10 produces the fracture because of dragging easily, thereby the water-proof effects of geomembrane has been promoted.

Referring to fig. 1, concrete cofferdam 8 is prismoid column structure, the bottom width of concrete cofferdam 8 is greater than the top width of concrete cofferdam 8, the inclination angle in the 8 outside of concrete cofferdam is greater than the inboard inclination angle of concrete cofferdam 8, because the depth of water is about dark pressure more big, be prismoid column with the setting of concrete cofferdam 8, can increase the compressive capacity of concrete cofferdam 8 bottom, thereby make concrete cofferdam 8 more firm, set up the great inclination angle in the 8 outside of concrete cofferdam and be used for providing side support effect to concrete cofferdam 8.

Referring to fig. 1, connecting plates 12 are arranged at two ends of a geomembrane 10, the connecting plates 12 at the top end of the geomembrane 10 are fixedly connected with a concrete cofferdam 8, the connecting plates 12 at the bottom end of the geomembrane 10 are embedded in a bedrock 1 at the bottom of a river bed 2, the connecting plates 12 are arranged at two ends of the geomembrane 10 and are used for connecting two ends of the geomembrane 10 with the concrete cofferdam 8 and the bedrock 1 respectively, so that the geomembrane 10 integrally penetrates through the concrete cofferdam 8 and a rock cofferdam 3, gaps are prevented from being formed in the concrete cofferdam 8 and the rock cofferdam 3 as much as possible, and river water leakage is reduced.

Referring to fig. 2, the gap between the inner walls of the geomembrane 10 and the accommodating groove 9 is filled with a filling block 11, the filling block 11 can be made of foam particles, the filling block 11 is arranged to protect the geomembrane 10, and cracks or edges and corners generated when the concrete cofferdam is settled are prevented as much as possible from being directly contacted with the geomembrane 10, so that the geomembrane 10 is pierced, and the permeability resistance of the geomembrane 10 is affected.

Referring to fig. 1 and 3, all being equipped with grip block 13 in the 3 both sides of earth-rock cofferdam, being equipped with connecting thread steel 14 on the grip block 13, connecting thread steel 14 runs through earth-rock cofferdam 3, connecting thread steel 14 both ends and grip block 13 looks joint, set up grip block 13 in 3 both sides of earth-rock cofferdam and be used for carrying out the centre gripping to earth-rock cofferdam 3, the earth-rock at 3 tops of earth-rock cofferdam is avoided as far as possible to the downward landing of earth-rock to the installation steadiness of the concrete cofferdam 8 that 3 tops of earth-rock cofferdam were pour has been promoted.

The implementation principle of the application is as follows: during construction, firstly, an earth-rock cofferdam 3 is paved at the bottom of a riverbed, after the earth-rock cofferdam 3 is paved, a foundation pit is excavated from the top of the earth-rock cofferdam 3, a cast-in-place pile 4, a cut-off wall 5 and an impact resistant column 6 are poured by a prefabricated template, a bracket 7 is arranged between the cut-off wall 5 and the impact resistant column 6 to support the cut-off wall 5, then a groove is excavated downwards on the earth-rock cofferdam 3 at the inner side of the cut-off wall 5, a concrete cofferdam 8 is poured at the top of the earth-rock cofferdam 3, an accommodating groove 9 is reserved on the concrete cofferdam 8, the accommodating groove 9 and the groove excavated inside the earth-rock cofferdam 3 are positioned on the same vertical plane, after the concrete cofferdam 8 is hardened, a geomembrane 10 provided with corrugations is installed inside the accommodating groove 9, when the concrete cofferdam 8 is poured to generate sedimentation or displacement, the corrugations arranged on the geomembrane 10 can be unfolded under the action of traction generated during the sedimentation or displacement, the tearing force caused to the geomembrane 10 when the concrete cofferdam 8 is settled is reduced, so that the situation that the geomembrane 10 is easily broken due to pulling in the settlement and deformation processes is avoided as much as possible, and the waterproof effect of the geomembrane 10 is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a flood prevention cofferdam structure, includes bedrock (1), riverbed (2) and earth-rock cofferdam (3), its characterized in that: the earth-rock cofferdam (3) is laid on the top of the riverbed (2), pile holes are formed in the earth-rock cofferdam (3), cast-in-place piles (4) are cast in the pile holes, anti-seepage walls (5) are cast in the earth-rock cofferdam (3) on the outer sides of the cast-in-place piles (4), the bottoms of the cast-in-place piles (4) and the anti-seepage walls (5) penetrate through the riverbed (2), the bottoms of the cast-in-place piles (4) and the anti-seepage walls (5) are connected with the bedrock (1), a concrete cofferdam (8) is cast on the top of the earth-rock cofferdam (3), an accommodating groove (9) is formed in the top of the concrete cofferdam (8), the earth-rock cofferdam (3) and the riverbed (2) penetrate through the accommodating groove (9), a geomembrane (10) is arranged in the concrete cofferdam (8), and a plurality of ripples are arranged on the geomembrane (10), the outer side of the geomembrane (10) is attached to the impervious wall (5).

2. The flood prevention cofferdam structure of claim 1, characterized in that: the surface of basement rock (1) is dug and is equipped with the mounting groove, bored concrete pile (4) with cut-off wall (5) bottom all is located inside the mounting groove, bored concrete pile (4) with cut-off wall (5) bottom with the laminating each other of mounting groove cavity inner wall.

3. The flood prevention cofferdam structure of claim 1, characterized in that: an anti-impact column (6) is poured outside the impervious wall (5) inside the earth-rock cofferdam (3), the bottom of the anti-impact column (6) penetrates through the earth-rock cofferdam (3) and the riverbed (2), and the anti-impact column (6) is attached to the bottom of the bedrock (1).

4. The flood prevention cofferdam structure of claim 3, characterized in that: impervious wall (5) with be equipped with bracket (7) between anti impact post (6), the both ends of bracket (7) respectively with impervious wall (5) with anti impact post (6) fixed connection, the quantity of bracket (7) is a plurality of, and is a plurality of bracket (7) are followed impervious wall (5) with the length direction equidistance of anti impact post (6) is arranged.

5. The flood prevention cofferdam structure of claim 1, characterized in that: the concrete cofferdam (8) is of a prismoid structure, the width of the bottom of the concrete cofferdam (8) is larger than the width of the top of the concrete cofferdam (8), and the inclination angle of the outer side of the concrete cofferdam (8) is larger than the inclination angle of the inner side of the concrete cofferdam (8).

6. The flood prevention cofferdam structure of claim 1, characterized in that: connecting plates (12) are arranged at two ends of the geomembrane (10), the connecting plates (12) positioned at the top end of the geomembrane (10) are fixedly connected with the concrete cofferdam (8), and the connecting plates (12) positioned at the bottom end of the geomembrane (10) are buried in the bedrock (1) at the bottom of the riverbed (2).

7. The flood prevention cofferdam structure of claim 1, characterized in that: the inner part of a gap between the geomembrane (10) and the inner wall of the accommodating groove (9) is filled with a filling block (11), and the filling block (11) can be foam particles.

8. The flood prevention cofferdam structure of claim 1, characterized in that: the earth-rock cofferdam is characterized in that clamping plates (13) are arranged on two sides of the earth-rock cofferdam (3), connecting thread steel (14) is arranged on the clamping plates (13), the connecting thread steel (14) penetrates through the earth-rock cofferdam (3), and two ends of the connecting thread steel (14) are connected with the clamping plates (13) in a clamped mode.