Concrete cofferdam and steel sheet pile cofferdam combined cofferdam structure

Abstract

The utility model discloses a concrete cofferdam and steel sheet pile cofferdam combined cofferdam structure, and belongs to the technical field of bridge construction. Comprising a concrete prefabricated bottom plate and a steel sheet pile cofferdam, a surrounding edge is poured on the top face of the concrete prefabricated bottom plate, a plurality of through holes are formed in the positions, on the inner side of the surrounding edge, of the concrete prefabricated bottom plate, and protruding parts are integrally poured on the positions, outside the through holes, of the top face of the concrete prefabricated bottom plate; reinforcing ribs are integrally poured between the adjacent protruding parts of the concrete prefabricated bottom plate, and the protruding parts on the sides and the inner edge of the surrounding edge are integrally poured. A plurality of embedded parts are arranged on the periphery of the concrete prefabricated bottom plate; according to the combined cofferdam structure of the concrete cofferdam and the steel sheet pile cofferdam, the concrete prefabricated bottom plate and the steel sheet pile cofferdam are firstly assembled on the water surface and then are hoisted to enter the water bottom, the underwater pouring amount is small, and construction is easy and convenient.

Description

Technical Field

[0001] The utility model specifically relates to a combined cofferdam structure of a concrete cofferdam and a steel sheet pile cofferdam, and belongs to the technical field of bridge construction. Background Art

[0002] Steel sheet pile cofferdams are light, easy to dismantle, reusable, have a short construction period and low cost, but have poor integrity and bear small horizontal loads, and are not suitable for deep foundation pits greater than 15 meters. Therefore, it is urgent to study a new cofferdam structure that can adapt to deep foundation pit excavation depth, fast construction speed, low cost, convenient and reliable in muddy geology. For example, Chinese patent publication number: CN206090593U discloses a combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam. The structure adopts a concrete cofferdam with high rigidity, which is placed in the lower part with large water pressure, and the steel sheet pile cofferdam is placed in the upper part with small water pressure, so that the force of the whole structure is more reasonable and the structure is safe and reliable. However, the structure has a large amount of underwater casting and is relatively complicated to construct. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam. The concrete cofferdam and the steel sheet pile cofferdam are pre-installed on the water surface and hoisted to the bottom of the water along the steel tube pile guide. The underwater pouring amount is small and the construction is simple and convenient.

[0004] The utility model discloses a combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam, comprising:

[0005] A precast concrete base plate, wherein a peripheral edge is cast on the top surface of the precast concrete base plate, a plurality of through holes are arranged on the inner side of the peripheral edge of the precast concrete base plate, and a protrusion is integrally cast on the top surface of the precast concrete base plate outside the through holes; reinforcing ribs are integrally cast between adjacent protrusions of the precast concrete base plate, and the protrusions on the side are integrally cast with the inner edge of the peripheral edge; a plurality of embedded parts are arranged on the periphery of the precast concrete base plate;

[0006] A steel sheet pile cofferdam, the steel sheet pile cofferdam comprises steel plates arranged at intervals on the outside of the perimeter, dovetail straight grooves are provided on both sides of the steel plates; adjacent steel plates are attached to each other and embedded with dovetail clamping columns; multiple T-shaped clamps are welded to the outside of the steel plates at intervals; multiple clamps are clamped on the clamps of adjacent steel plates; the clamps are fixed to the steel plates by bolts; one of the clamps is clamped to the bottom of the clamp and fixed with a limit plate, and the other side of the limit plate is clamped and fixed with the embedded part; an upper ring-shaped purlin and a lower ring-shaped purlin are provided on the inner side of the steel plate; inner supports are provided on the upper ring-shaped purlin and the lower ring-shaped purlin; the inner supports are staggered with the through holes;

[0007] After the through hole passes through the casting pile, a reinforced concrete bottom layer is cast on the top surface of the precast concrete bottom plate.

[0008] During construction, the steel tube piles are first driven into the water bottom, holes are opened at the same height as the upper part of the steel tube piles, and cushion beams are inserted into the holes of the adjacent steel tube piles. Then, the precast concrete base plate is hoisted onto the steel tube piles, and the precast concrete base plate is pressed onto the cushion beams. Then, the steel sheet pile cofferdam is assembled onto the precast concrete base plate. Then, the hoisting equipment hoists the precast concrete base plate up to a certain height to separate the hoisted precast concrete base plate from the cushion beams. Then, the cushion beams are pulled out, and the hoisting equipment hoists the precast concrete base plate down to the water bottom. At this time, tension and compression rods are fixed between the precast concrete base plate and the steel tube piles; the precast concrete base plate is kept in the set position by the tension and compression rods Placement; then, arrange an underwater annular grouting membrane bag between the steel cylinder pile and the through hole to form an annular sealing groove at the bottom; then, place a steel sleeve inside the steel cylinder pile and pour underwater micro-expansion non-dispersive concrete; pouring height protrudes from the top surface of the precast concrete bottom plate; wait for the underwater micro-expansion non-dispersive concrete to solidify, and then carry out the pumping process. After the pumping is completed, remove the tension and compression rods, and cut the steel cylinder pile above the precast concrete bottom plate through cutting equipment, and lift the steel cylinder pile away, then bend the steel sleeve, arrange the steel mesh, and then pour the concrete bottom layer on the steel mesh; when the construction of the inner pedestal of the cofferdam is completed, dive to remove the limit plate, and hoist the steel plate for recovery.

[0009] Furthermore, a rubber pad is provided between the precast concrete bottom plate and the steel plate; the steel plate is deformed by its own gravity pressing the rubber pad, thereby achieving sealing at the contact position between the precast concrete bottom plate and the steel plate.

[0010] Furthermore, a waterstop mortar layer is cast on the outer periphery of the periphery and the inner edge of the steel plate; when the precast concrete base plate and the steel sheet pile cofferdam are assembled, a micro-expansion waterstop mortar is cast in the assembly ring groove formed by the precast concrete base plate and the steel sheet pile cofferdam to form a waterstop mortar layer; thereby forming a sealing surface between the top surface of the precast concrete base plate and the bottom of the steel sheet pile cofferdam.

[0011] Furthermore, the lower part of the limit plate is first engaged with the embedded part, and the upper part of the limit plate is fixed by bolts and clamps. During installation, the limit plate is directly engaged with the embedded part first, and fixed by bolts and clamps to prevent the limit plate from falling off the end of the embedded part.

[0012] Furthermore, a reinforcing beam is fixed between adjacent clamps by bolts, and the adjacent clamp ends can be assembled into one piece by the reinforcing beam, thereby forming a circumferential reinforcement enclosure outside the steel plate.

[0013] Compared with the prior art, the combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam of the utility model adopts a prefabricated concrete bottom plate and a steel sheet pile cofferdam to be assembled on the water surface first, and then hoisted to the bottom of the water, and the bottom is cast and sealed with steel tube piles to cast them into one piece; the underwater casting amount is small, and the construction is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the concrete prefabricated base plate structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the local installation structure of the prefabricated concrete base plate and steel sheet pile cofferdam of the utility model.

[0016] Figure 3 For the utility model Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0017] Figure 4 It is a schematic diagram of the cross-sectional structure of the combined cofferdam structure of the utility model.

[0018] Figure numerals: 1. precast concrete base plate, 2. edge, 3. through hole, 4. protrusion, 5. reinforcement rib, 6. embedded part, 7. steel plate, 8. dovetail straight groove, 9. dovetail clamping column, 10. clamping rib, 11. clamp, 12. limit plate, 13. upper ring-shaped purlin, 14. lower ring-shaped purlin, 15. reinforced concrete bottom layer, 16. rubber pad, 17. water-stop mortar layer, 18. internal support, 19. cast pile. DETAILED DESCRIPTION

[0019] Example:

[0020] like Figures 1 to 4 The combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam shown in the figure includes:

[0021] A precast concrete base plate 1, wherein a peripheral edge 2 is cast on the top surface of the precast concrete base plate 1, a plurality of through holes 3 are arranged on the inner side of the peripheral edge 2 of the precast concrete base plate 1, and a protrusion 4 is integrally cast on the top surface of the precast concrete base plate 1 outside the through holes 3; reinforcing ribs 5 are integrally cast between adjacent protrusions 4 of the precast concrete base plate 1, and the protrusions 4 on the side are integrally cast with the inner edge of the peripheral edge 2; a plurality of embedded parts 6 are arranged on the periphery of the precast concrete base plate 1;

[0022] A steel sheet pile cofferdam, the steel sheet pile cofferdam comprises steel plates 7 arranged at intervals outside the perimeter 2, dovetail straight grooves 8 are provided on both sides of the steel plates 7; adjacent steel plates 7 are attached to each other and embedded with dovetail clamping columns 9; multiple T-shaped clamping ribs 10 are welded at intervals outside the steel plates 7; multiple clamps 11 are clamped on the clamping ribs 10 of adjacent steel plates 7; the clamps 11 are fixed to the steel plates 7 by bolts; one of the clamps 11 is clamped to the bottom of the clamping rib 10 and fixed with a limiting plate 12, and the other side of the limiting plate 12 is clamped and fixed with the embedded part 6; an upper ring-shaped surrounding purlin 13 and a lower ring-shaped surrounding purlin 14 are provided on the inner side of the steel plate 7; inner supports 18 are provided on both the upper ring-shaped surrounding purlin 13 and the lower ring-shaped surrounding purlin 14; the inner supports 18 are arranged in a staggered manner with the through holes 3;

[0023] After the through hole 3 passes through the casting pile 19 , a reinforced concrete bottom layer 15 is cast on the top surface of the precast concrete base plate 1 .

[0024] During construction, first drive the steel tube piles into the water bottom, open holes at the same height as the upper part of the steel tube piles, insert cushion beams into the holes of the adjacent steel tube piles, then hoist the precast concrete base plate 1 onto the steel tube piles, press the precast concrete base plate 1 onto the cushion beams, then assemble the steel sheet pile cofferdam onto the precast concrete base plate 1, then, the hoisting equipment hoists the precast concrete base plate 1 up to a certain height to separate the hoisted precast concrete base plate 1 from the cushion beams, then, pull out the cushion beams, and the hoisting equipment hoists the precast concrete base plate 1 down to the water bottom, at this time, tension and compression rods are fixed between the precast concrete base plate 1 and the steel tube piles; the tension and compression rods are used to keep the precast concrete base plate 1 at the set position; then, an underwater annular grouting membrane bag is arranged between the steel cylinder pile and the through hole 3 to form an annular sealing groove at the bottom; then, a steel sleeve is placed on the inside of the steel cylinder pile, and underwater micro-expansion non-dispersive concrete is poured; the pouring height protrudes from the top surface of the precast concrete bottom plate 1; after waiting for the underwater micro-expansion non-dispersive concrete to solidify, the pumping process is carried out. After the pumping is completed, the tension and compression rods are removed, and the steel cylinder piles above the precast concrete bottom plate 1 are cut by cutting equipment, and the steel cylinder piles are lifted away, then the steel sleeves are bent, and a steel mesh is arranged, and then a concrete bottom layer is poured on the steel mesh; when the construction of the inner pedestal of the cofferdam is completed, the limit plate 12 is removed by diving, and the steel plate 7 is hoisted and recovered.

[0025] A rubber pad 16 is provided between the concrete precast bottom plate 1 and the steel plate 7 ; the steel plate 7 is deformed by its own weight pressing the rubber pad 16 , thereby achieving sealing at the contact position between the concrete precast bottom plate 1 and the steel plate 7 .

[0026] A water-stop mortar layer 17 is cast on the outer periphery of the periphery 2 and the inner edge of the steel plate 7; when the precast concrete base plate 1 and the steel sheet pile cofferdam are assembled, a micro-expansion water-stop mortar is cast in the assembly ring groove formed by the precast concrete base plate 1 and the steel sheet pile cofferdam to form the water-stop mortar layer 17; thereby forming a sealing surface between the top surface of the precast concrete base plate 1 and the bottom of the steel sheet pile cofferdam.

[0027] The lower part of the limit plate 12 is first engaged with the embedded part 6, and the upper part of the limit plate 12 is fixed with the clamp 11 by bolts. During installation, the limit plate 12 is directly engaged with the embedded part 6 first, and fixed with the bolts and the clamp 11 to prevent the limit plate 12 from slipping out of the end of the embedded part 6.

[0028] A reinforcing beam is fixed between adjacent clamps 11 by bolts, and the ends of adjacent clamps 11 can be assembled into one piece by the reinforcing beam, thereby forming a circumferential reinforcement enclosure outside the steel plate 7.

[0029] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam, characterized in that: include: A precast concrete base plate, wherein a peripheral edge is cast on the top surface of the precast concrete base plate, a plurality of through holes are arranged on the inner side of the peripheral edge of the precast concrete base plate, and a protrusion is integrally cast on the top surface of the precast concrete base plate outside the through holes; reinforcing ribs are integrally cast between adjacent protrusions of the precast concrete base plate, and the protrusions on the side are integrally cast with the inner edge of the peripheral edge; a plurality of embedded parts are arranged on the periphery of the precast concrete base plate; A steel sheet pile cofferdam, the steel sheet pile cofferdam comprises steel plates arranged at intervals on the outside of the perimeter, dovetail straight grooves are provided on both sides of the steel plates; adjacent steel plates are attached to each other and embedded with dovetail clamping columns; multiple T-shaped clamps are welded to the outside of the steel plates at intervals; multiple clamps are clamped on the clamps of adjacent steel plates; the clamps are fixed to the steel plates by bolts; one of the clamps is clamped to the bottom of the clamp and fixed with a limit plate, and the other side of the limit plate is clamped and fixed with the embedded part; an upper ring-shaped purlin and a lower ring-shaped purlin are provided on the inner side of the steel plate; inner supports are provided on the upper ring-shaped purlin and the lower ring-shaped purlin; the inner supports are staggered with the through holes; After the through hole passes through the casting pile, a reinforced concrete bottom layer is cast on the top surface of the precast concrete bottom plate.

2. The combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam according to claim 1 is characterized in that: A rubber pad is arranged between the prefabricated concrete bottom plate and the steel plate.

3. The combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam according to claim 1 is characterized in that: A water-stop mortar layer is poured around the periphery of the surrounding edge and the inner edge of the steel plate.

4. The combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam according to claim 1 is characterized in that: The lower part of the limit plate is first clamped on the embedded part, and the upper part of the limit plate is fixed by bolts and clamps.

5. The combined cofferdam structure of concrete cofferdam and steel sheet pile cofferdam according to claim 1 is characterized in that: A reinforcing beam is fixed between adjacent clamps by bolts.

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