Prestress fabricated cofferdam structure suitable for bridge construction

Abstract

The utility model relates to the technical field of civil engineering, and particularly discloses a prestress assembly type cofferdam structure suitable for bridge construction, which comprises a cofferdam plate group I and a cofferdam plate group II which are symmetrically arranged in parallel, and a cofferdam plate group III and a cofferdam plate group IV which are symmetrically arranged in parallel, the first cofferdam plate set and the third cofferdam plate set, the first cofferdam plate set and the fourth cofferdam plate set, the second cofferdam plate set and the third cofferdam plate set, and the second cofferdam plate set and the fourth cofferdam plate set are connected through fifth cofferdam plate sets respectively. The cofferdam plate group I, the cofferdam plate group III, the cofferdam plate group II, the cofferdam plate group IV and the plurality of cofferdam plate groups V enclose to form a cofferdam frame with a cuboid structure. The fabricated cofferdam is simple in structure and convenient to manufacture, assemble and disassemble, the fabricated structure is adopted, and the right-angle cofferdam plates, the transverse cofferdam plates and the vertical cofferdam plates are prefabricated structures, so that the field welding time is greatly shortened, and the production cost is reduced; the construction period can be effectively shortened, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field, specifically provide a kind of prestressed assembly type cofferdam structure suitable for bridge construction. BACKGROUND

[0002] With the rapid development of bridge construction across river, across sea in China, bridge lower construction often needs to be carried out in deep water area, especially bridge pier and pile cap construction, in order to reduce the influence of water flow on bridge lower structure construction progress and quality, the best method is to build cofferdam in water as temporary enclosing structure in advance. Enclosing structure can not only provide stable construction space by internal transverse support, facilitate excavation and drainage of foundation pit, but also adapt to complex geological conditions under various deep water environments, so as to reduce the influence on surrounding environment, and further guarantee construction safety and construction quality.

[0003] At present, among the cofferdam structures commonly used in bridge engineering construction, the most widely used is various types of steel cofferdam structure, such as the following patent documents in the prior art relate to steel cofferdam structure of bridge:

[0004] 1. The patent scheme with publication number "CN218291630U" and name "Steel cofferdam structure for bridge construction" includes lower cofferdam and protection assembly, upper cofferdam is arranged outside the lower cofferdam, and the protection assembly includes mounting frame, mounting groove, mounting strip, mounting plate, bottom plate, resistance spring, resistance rod, guard plate, mounting frame, mounting groove, mounting plate, bottom plate, resistance spring, etc. The utility model scheme can provide protection for cofferdam when it is impacted, and damaged units can be replaced individually when the guard plate is damaged.

[0005] 2. The patent scheme with publication number "CN218233537U" and name "Single and double wall steel cofferdam for bridge construction" includes single and double wall steel cofferdam body, which is composed of four side plates, the side plates include single wall cofferdam section and double wall cofferdam section, the single wall cofferdam section includes outer wall plate one, and the double wall cofferdam section includes outer wall plate two and inner wall plate. The utility model scheme simplifies construction steps, shortens construction period, solves the problem of deep water bridge foundation construction, can fully utilize the material, and saves construction cost.

[0006] However, the above steel cofferdam in the prior art has the following problems: 1. The steel cofferdam requires high manufacturing precision and welding technology when it is spliced on site, and the construction difficulty is large. When the foundation ground is far away from the riverbed, or there are a large number of boulders and gravel in the riverbed, or there are underwater obstacles, the sinking difficulty of the steel cofferdam is significantly increased, and there is a risk of floating up during flood season. 2. The installation and removal process of steel cofferdam is complex, the construction period is long, the corrosion resistance is poor, the steel consumption is large, and the cost is high.

[0007] The above problems restrict the safety, efficiency and economy of bridge construction to a certain extent, therefore, how to design a bridge construction cofferdam structure with small construction difficulty, short construction period and convenient disassembly and assembly to optimize the cofferdam structure design and overcome the defects of the prior art has become a problem to be solved in the field of bridge engineering. Practical new type content

[0008] The utility model discloses to solve the above -mentioned problem, provide a kind of prestressed assembly type cofferdam structure suitable for bridge construction, the cofferdam structure in the scheme is simple, lower cost, can improve the assembly construction efficiency of cofferdam, simplify construction process flow, shorten construction period, convenient to disassemble and install.

[0009] The utility model discloses a kind of prestressed assembly type cofferdam structure suitable for bridge construction, including parallel and symmetrically arranged cofferdam plate group one and cofferdam plate group two, parallel and symmetrically arranged cofferdam plate three and cofferdam plate group four;Cofferdam plate group one and cofferdam plate group two are perpendicular to cofferdam plate three, cofferdam plate group four;Cofferdam plate group one and cofferdam plate group three between, cofferdam plate group one and cofferdam plate group four between, cofferdam plate group two and cofferdam plate group three between, cofferdam plate group two and cofferdam plate group four between are connected by cofferdam plate group five respectively;Cofferdam plate group one, cofferdam plate group three, cofferdam plate group two, cofferdam plate group four and multiple cofferdam plate group five form the cofferdam frame of cuboid structure by enclosing;

[0010] Cofferdam plate group one includes at least two long side cofferdam plates one arranged in vertical direction, cofferdam plate group two includes at least two long side cofferdam plates two arranged in vertical direction, cofferdam plate group three includes at least two short side cofferdam plates one arranged in vertical direction, cofferdam plate group four includes at least two short side cofferdam plates two arranged in vertical direction, cofferdam plate group five includes at least two right angle cofferdam plates arranged in vertical direction, right angle cofferdam plate includes mutually perpendicular connecting plate one, connecting plate two, long side cofferdam plate one and long side cofferdam plate two are connected with its adjacent connecting plate one and parallel, short side cofferdam plate one and short side cofferdam plate two are connected with its adjacent connecting plate two and parallel;

[0011] The connecting hole one is vertically matched between the long edge cofferdam plates one and the long edge cofferdam plates two, and a corrugated pipe one is arranged in the connecting hole one; the connecting hole two is vertically matched between the short edge cofferdam plates one and the short edge cofferdam plates two, and a corrugated pipe two is arranged in the connecting hole two; the connecting hole three is vertically matched between the right angle cofferdam plates, and a corrugated pipe three is arranged in the connecting hole three; the connecting hole four is horizontally and longitudinally matched between the long edge cofferdam plates one and the right angle cofferdam plates and between the long edge cofferdam plates two and the right angle cofferdam plates, and a corrugated pipe four is arranged in the connecting hole four; the connecting hole five is horizontally and transversely matched between the short edge cofferdam plates one and the right angle cofferdam plates and between the short edge cofferdam plates two and the right angle cofferdam plates, and a corrugated pipe five is arranged in the connecting hole five; and the connecting hole three, the connecting hole four and the connecting hole five are arranged in a staggered mode.

[0012] Further, the long edge cofferdam plate one and the short edge cofferdam plate one, the long edge cofferdam plate one and the short edge cofferdam plate two, the long edge cofferdam plate two and the short edge cofferdam plate one, and the long edge cofferdam plate two and the short edge cofferdam plate two are respectively supported by the side support rods.

[0013] Further, the long edge cofferdam plate one and the long edge cofferdam plate two are supported by the middle support rod.

[0014] Further, the inner walls of the long edge cofferdam plate one, the long edge cofferdam plate two, the short edge cofferdam plate one and the short edge cofferdam plate two are respectively provided with embedded steel plates; the two ends of the side support rods are respectively welded on the embedded steel plates, and the two ends of the middle support rod are respectively welded on the embedded steel plates.

[0015] Further, the inner walls of the long edge cofferdam plate one are uniformly provided with the embedded steel plate one and the embedded steel plate two on the two sides, the inner walls of the long edge cofferdam plate two are uniformly provided with the embedded steel plate three and the embedded steel plate four on the two sides, the inner walls of the short edge cofferdam plate one are uniformly provided with the embedded steel plate five and the embedded steel plate six on the two sides, and the inner walls of the short edge cofferdam plate two are uniformly provided with the embedded steel plate seven and the embedded steel plate eight on the two sides.

[0016] The side support rod between the long edge cofferdam plate one and the short edge cofferdam plate one is the side support rod one, the two ends of the side support rod one are respectively welded on the embedded steel plate one and the embedded steel plate five; the side support rod between the long edge cofferdam plate one and the short edge cofferdam plate two is the side support rod two, the two ends of the side support rod two are respectively welded on the embedded steel plate two and the embedded steel plate seven; the side support rod between the long edge cofferdam plate two and the short edge cofferdam plate one is the side support rod three, the two ends of the side support rod three are respectively welded on the embedded steel plate three and the embedded steel plate six; and the side support rod between the long edge cofferdam plate two and the short edge cofferdam plate two is the side support rod four, the two ends of the side support rod four are respectively welded on the embedded steel plate four and the embedded steel plate eight.

[0017] Further, the middle support rod comprises a middle support rod one and a middle support rod two welded between the long side cofferdam plate one and the long side cofferdam plate two; the middle part of the long side cofferdam plate one is symmetrically provided with a pre-embedded steel plate nine and a pre-embedded steel plate ten, and the middle part of the long side cofferdam plate two is symmetrically provided with a pre-embedded steel plate eleven and a pre-embedded steel plate twelve; the two ends of the middle support rod one are welded between the pre-embedded steel plate nine and the pre-embedded steel plate eleven, and the two ends of the middle support rod two are welded between the pre-embedded steel plate ten and the pre-embedded steel plate twelve.

[0018] Further, the connecting part one in the right-angle cofferdam plate is respectively provided with a tenon one at the connecting part with the long side cofferdam plate one and the long side cofferdam plate two, and the connecting part two in the right-angle cofferdam plate is respectively provided with a tenon two at the connecting part with the short side cofferdam plate one and the short side cofferdam plate two; the connecting part of the long side cofferdam plate one and the long side cofferdam plate two with the connecting part one is matched with a mortise groove one, and the connecting part of the short side cofferdam plate one and the short side cofferdam plate two with the connecting part two is matched with a mortise groove two; the connecting part one and the long side cofferdam plate one and the long side cofferdam plate two are connected through the tenon one and the mortise groove one, and the connecting part two and the short side cofferdam plate one and the short side cofferdam plate two are connected through the tenon two and the mortise groove two.

[0019] Further, the connecting hole one, the connecting hole two, the connecting hole three, the connecting hole four and the connecting hole five all comprise a middle hole and a plurality of side holes distributed outside the middle hole in a circumferential direction; the connecting hole one is provided with a corrugated pipe one in each of the middle hole and the side holes, the connecting hole two is provided with a corrugated pipe two in each of the middle hole and the side holes, the connecting hole three is provided with a corrugated pipe three in each of the middle hole and the side holes, the connecting hole four is provided with a corrugated pipe four in each of the middle hole and the side holes, and the connecting hole five is provided with a corrugated pipe five in each of the middle hole and the side holes.

[0020] Further, the connecting hole one, the connecting hole two, the connecting hole three, the connecting hole four and the connecting hole five all comprise six side holes distributed outside the middle hole in a circumferential direction; each of the corrugated pipe one, the corrugated pipe two, the corrugated pipe three, the corrugated pipe four and the corrugated pipe five is provided with seven strands of prestressed steel strands.

[0021] Further, the cofferdam plate group one, the cofferdam plate group two, the cofferdam plate three and the cofferdam plate group four are all made of UHPC.

[0022] Compared with the prior art, the utility model has the advantages that:

[0023] 1. The utility model discloses a prefabricated structure, wherein the cofferdam structure is simple, convenient to manufacture and disassemble, the right-angle cofferdam plate, the long side cofferdam plate one, the long side cofferdam plate two, the short side cofferdam plate one and the short side cofferdam plate two are all prefabricated structures, which greatly shorten the welding time on site, reduce the production cost, effectively shorten the construction period, improve the construction efficiency, and after use, only need to cut off the prestressed corrugated pipe and the welding point that play the connecting role, then each accessory can be lifted away one by one, can be repeatedly used, and the production cost is further reduced.

[0024] 2. The utility model discloses a right-angle cofferdam plate, long side cofferdam plate one, long side cofferdam plate two, short side cofferdam plate one and short side cofferdam plate two are all made of UHPC, which is heavier than steel cofferdam, can effectively prevent the cofferdam from floating up, at the same time, UHPC has corrosion resistance and excellent durability, the UHPC cofferdam wall plate after disassembly can be reused, reducing the pollution to the environment, at the same time, suitable for bridge construction in harsh environment such as crossing river and sea.

[0025] 3. In the utility model, the prestressed corrugated pipe is used for connection, which can realize the connection stability of the prefabricated structure parts, the prestress can make the right-angle cofferdam plate, long side cofferdam plate one, long side cofferdam plate two, short side cofferdam plate one and short side cofferdam plate two be in compression state before bearing load, greatly improve the bearing capacity, and can effectively resist the external water pressure.

[0026] At the same time, the prestress can offset part of the tensile stress generated by external load, delay or avoid the occurrence of concrete cracks, significantly improve the crack resistance and durability.

[0027] In addition, due to the prestress technology reduces the generation of cracks, reduces the risk of leakage and corrosion, thereby reducing the maintenance cost and repair frequency of the structure, the prestress technology can improve the stress performance of the cofferdam, so that it has better ductility and seismic capacity under extreme load such as earthquake. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the overall structure schematic diagram of cofferdam structure according to the utility model embodiment provides;

[0029] Figure 2 It is the overhead structure schematic diagram of cofferdam structure according to the utility model embodiment provides;(In the drawing, the direction shown as M is longitudinal, and the direction shown as N is transverse)

[0030] Figure 3 It is the splicing diagram of right-angle cofferdam plate and long side cofferdam plate one in cofferdam structure according to the utility model embodiment provides;

[0031] Figure 4It is the vertical splicing schematic view of the long side cofferdam plate one in the cofferdam structure according to the embodiment of the utility model, (in the drawing, the direction shown as K is vertical);

[0032] Figure 5 It is the splicing schematic view of the right angle cofferdam plate and the short side cofferdam plate one in the cofferdam structure according to the embodiment of the utility model, (in the drawing, B shown is the bellows)

[0033] Figure 6 It is the position setting schematic view of the connecting hole three and the connecting hole four in the cofferdam structure according to the embodiment of the utility model;

[0034] Figure 7 It is the specific structure schematic view of the connecting hole three in the cofferdam structure according to the embodiment of the utility model.

[0035] The reference signs in it include: long side cofferdam plate one 1, long side cofferdam plate two 2, short side cofferdam plate one 3, short side cofferdam plate two 4, right angle cofferdam plate 5, connecting plate one 6, connecting plate two 7, connecting hole one 8, connecting hole two 9, connecting hole three 10, connecting hole four 11, connecting hole five 12, embedded steel plate three 13, embedded steel plate four 14, embedded steel plate five 15, embedded steel plate six 16, side support rod one 17, side support rod two 18, side support rod three 19, side support rod four 20, middle part support rod one 21, middle part support rod two 22, mortise one 23, tenon groove one 24, mortise two 25, tenon groove two 26, middle part hole 27, side part hole 28, embedded steel plate eleven 29, embedded steel plate twelve 30. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantage of the utility model more clearly and clearly, the following is combined with the attached Figures 1-7 and specific embodiment, and the utility model is further explained in detail.It should be understood that the specific embodiment described here is only used to explain the utility model, and does not constitute the limitation to the utility model.

[0037] A prestressed assembly type cofferdam structure suitable for bridge construction, comprising cofferdam plate group one and cofferdam plate group two arranged in parallel and symmetrically, cofferdam plate three and cofferdam plate group four arranged in parallel and symmetrically, cofferdam plate three and cofferdam plate group four are arranged along the longitudinal direction M, cofferdam plate group one and cofferdam plate group two are perpendicular to cofferdam plate three and cofferdam plate group four, cofferdam plate group one, cofferdam plate group two, cofferdam plate three and cofferdam plate group four are all made of UHPC.

[0038] The cofferdam plate group one and the cofferdam plate group three, the cofferdam plate group one and the cofferdam plate group four, the cofferdam plate group two and the cofferdam plate group three, and the cofferdam plate group two and the cofferdam plate group four are connected by the cofferdam plate group five, and the cofferdam plate group one, the cofferdam plate group three, the cofferdam plate group two, the cofferdam plate group four and the plurality of cofferdam plate group five are combined to form a cuboid structure cofferdam frame, and the cofferdam plate group five includes four groups of cofferdam plates arranged at four corners of the cuboid structure cofferdam frame.

[0039] As shown in Figure 1 , Figure 2 , the cofferdam plate group one includes at least two long-side cofferdam plates one 1 arranged in a vertical stack (for reference, see the vertical splicing diagram of the stacked long-side cofferdam plates one 1 in Figure 4 ), the cofferdam plate group two includes at least two long-side cofferdam plates two 2 arranged in a vertical stack, the cofferdam plate group three includes at least two short-side cofferdam plates one 3 arranged in a vertical stack, the cofferdam plate group four includes at least two short-side cofferdam plates two 4 arranged in a vertical stack, and the cofferdam plate group five includes at least two right-angle cofferdam plates 5 arranged in a vertical stack.

[0040] In this embodiment, the long-side cofferdam plates one 1, the long-side cofferdam plates two 2, the short-side cofferdam plates one 3, the short-side cofferdam plates two 4 and the right-angle cofferdam plates 5 are all provided in two, and the long-side cofferdam plates one 1, the long-side cofferdam plates two 2, the short-side cofferdam plates one 3, the short-side cofferdam plates two 4 and the right-angle cofferdam plates 5 are all fabricated and precast structures, which can be installed and disassembled according to actual needs, and if convenient for transportation and hoisting, the long-side cofferdam plates one 1, the long-side cofferdam plates two 2, the short-side cofferdam plates one 3, the short-side cofferdam plates two 4 and the right-angle cofferdam plates 5 can be further split and precast.

[0041] As shown in Figure 1 , the right-angle cofferdam plate 5 includes mutually perpendicular connecting plates one 6 and connecting plates two 7, the long-side cofferdam plates one 1 and the long-side cofferdam plates two 2 are connected with and parallel to the adjacent connecting plates one 6, and the short-side cofferdam plates one 3 and the short-side cofferdam plates two 4 are connected with and parallel to the adjacent connecting plates two 7.

[0042] As shown in Figure 1 , Figure 3 , Figure 5 , the connecting plates one 6 in the right-angle cofferdam plate 5 are provided with tenons one 23 at the connecting positions with the long-side cofferdam plates one 1 and the long-side cofferdam plates two 2, respectively, and the connecting positions of the long-side cofferdam plates one 1 and the long-side cofferdam plates two 2 with the connecting plates one 6 are provided with mortises one 24 matched with the tenons one 23, and the connecting plates one 6 and the long-side cofferdam plates one 1 and the long-side cofferdam plates two 2 are connected through the tenons one 23 and the mortises one 24.

[0043] The connecting plate two 7 in the right angle cofferdam plate 5 is provided with a mortise two 25 at the connecting position with the short side cofferdam plate one 3 and the short side cofferdam plate two 4, and the short side cofferdam plate one 3 and the short side cofferdam plate two 4 are provided with a mortise groove two 26 at the connecting position with the connecting plate two 7, which is matched with the mortise two 25.

[0044] As shown in Figure 1 The connecting hole one 8 is provided with the corrugated pipe one, the connecting hole two 9 is provided with the corrugated pipe two, the connecting hole three 10 is provided with the corrugated pipe three, the connecting hole four 11 is provided with the corrugated pipe four, the connecting hole five 12 is provided with the corrugated pipe five.

[0045] The connecting hole one 8, the connecting hole two 9, the connecting hole three 10, the connecting hole four 11 and the connecting hole five 12 all include a middle hole 27 and a plurality of side holes 28 distributed on the outer side of the middle hole 27 in the circumferential direction, the middle hole 27 and each side hole 28 of the connecting hole one 8 are provided with the corrugated pipe one, the middle hole 27 and each side hole 28 of the connecting hole two 9 are provided with the corrugated pipe two, the middle hole 27 and each side hole 28 of the connecting hole three 10 are provided with the corrugated pipe three, the middle hole 27 and each side hole 28 of the connecting hole four 11 are provided with the corrugated pipe four, and the middle hole 27 and each side hole 28 of the connecting hole five 12 are provided with the corrugated pipe five.

[0046] The connecting hole one 8, the connecting hole two 9, the connecting hole three 10, the connecting hole four 11 and the connecting hole five 12 all include six side holes 28 distributed on the outer side of the middle hole 27 in the circumferential direction, each corrugated pipe one, corrugated pipe two, corrugated pipe three, corrugated pipe four and corrugated pipe five is provided with seven strands of prestressed steel wire, and each middle hole 27 and six side holes 28 in each connecting hole are provided with one strand of prestressed steel wire, that is, each corrugated pipe has a bundle of prestressed steel wire, and a bundle of steel wire contains seven strands of steel wire, and the structure of the corrugated pipe and the connecting hole is shown in the connecting hole three 10 and the connecting hole four 11, Figure 6 The positions of the connecting hole three 10 and the connecting hole four 11 are shown in the Figure 7 The specific structure of the connecting hole three 10 is shown in the

[0047] As Figure 1 、 Figure 2 shown, the long side cofferdam plate one 1 and the short side cofferdam plate one 3, the long side cofferdam plate one 1 and the short side cofferdam plate two 4, the long side cofferdam plate two 2 and the short side cofferdam plate one 3, the long side cofferdam plate two 2 and the short side cofferdam plate two 4 are respectively reinforced and supported by side support rods, the side support rod between the long side cofferdam plate one 1 and the short side cofferdam plate one 3 is side support rod one 17, the side support rod between the long side cofferdam plate one 1 and the short side cofferdam plate two 4 is side support rod two 18, the side support rod between the long side cofferdam plate two 2 and the short side cofferdam plate one 3 is side support rod three 19, and the side support rod between the long side cofferdam plate two 2 and the short side cofferdam plate two 4 is side support rod four 20.

[0048] The long side cofferdam plate one 1 and the long side cofferdam plate two 2 are reinforced and supported by a middle support rod, and the middle support rod comprises a middle support rod one 21 and a middle support rod two 22 welded between the long side cofferdam plate one 1 and the long side cofferdam plate two 2; the inner walls of the long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3 and the short side cofferdam plate two 4 are provided with embedded steel plates; the two ends of the side support rod are welded on the embedded steel plates; and the two ends of the middle support rod are welded on the embedded steel plates.

[0049] The inner walls of the long side cofferdam plate one 1 are uniformly provided with an embedded steel plate one and an embedded steel plate two; the inner walls of the long side cofferdam plate two 2 are uniformly provided with an embedded steel plate three 13 and an embedded steel plate four 14; the embedded steel plate one and the embedded steel plate two are symmetrically arranged with the embedded steel plate three 13 and the embedded steel plate four 14; the inner walls of the short side cofferdam plate one 3 are uniformly provided with an embedded steel plate five 15 and an embedded steel plate six 16; the inner walls of the short side cofferdam plate two 4 are uniformly provided with an embedded steel plate seven and an embedded steel plate eight; the embedded steel plate five 15 and the embedded steel plate six 16 are symmetrically arranged with the embedded steel plate seven and the embedded steel plate eight; the middle part of the long side cofferdam plate one 1 is symmetrically provided with an embedded steel plate nine and an embedded steel plate ten; and the middle part of the long side cofferdam plate two 2 is symmetrically provided with an embedded steel plate eleven 29 and an embedded steel plate twelve 30.

[0050] The two ends of the side support rod one 17 are welded on the embedded steel plate one and the embedded steel plate five 15; the two ends of the side support rod two 18 are welded on the embedded steel plate two and the embedded steel plate seven; the two ends of the side support rod three 19 are welded on the embedded steel plate three 13 and the embedded steel plate six 16; the two ends of the side support rod four 20 are welded on the embedded steel plate four 14 and the embedded steel plate eight; the two ends of the middle support rod one 21 are welded between the embedded steel plate nine and the embedded steel plate eleven 29; and the two ends of the middle support rod two 22 are welded between the embedded steel plate ten and the embedded steel plate twelve 30.

[0051] The construction method of the utility model comprises the following steps:

[0052] First step: prefabricate the long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5: according to the design size, prefabricate the long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5 in the factory; when prefabricating each cofferdam plate, prefabricate the corresponding number of corrugated pipes in the connecting hole one 8, the connecting hole two 9, the connecting hole three 10, the connecting hole four 11 and the connecting hole five 12.

[0053] Second step: horizontally connect the upper layer long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5 by threading the steel strand to form the first layer cuboid structure sub cofferdam frame; horizontally connect the lower layer long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5 by threading the steel strand to form the second layer cuboid structure sub cofferdam frame.

[0054] When horizontally threading the steel strand for each layer long side cofferdam plate one 1, the long side cofferdam plate two 2, the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5, the steel strand is threaded into one end of the corresponding connecting hole and threaded out from the other end, a steel alloy anchor plate is sleeved on the threaded-out position, an anchor clamp is sleeved, a limiting plate is installed, a hydraulic drive device is used to drive the jack to tension the prestressed steel strand to the set pressure, the excess steel strand is cut off, grouting is injected into the corrugated pipe through the reserved grouting port and the grouting port is sealed, finally, a water stop belt is placed at the joint and fixed to ensure that it is tightly fitted, thereby realizing the horizontal connection between the long side cofferdam plate one 1 and the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5, realizing the horizontal connection between the long side cofferdam plate two 2 and the short side cofferdam plate one 3, the short side cofferdam plate two 4 and the right angle cofferdam plate 5, realizing the horizontal connection between the short side cofferdam plate one 3 and the long side cofferdam plate one 1, the long side cofferdam plate two 2 and the right angle cofferdam plate 5, and realizing the horizontal connection between the short side cofferdam plate two 4 and the long side cofferdam plate one 1, the long side cofferdam plate two 2 and the right angle cofferdam plate 5.

[0055] Third step: vertically splice and align the first layer sub cofferdam frame and the second layer sub cofferdam frame processed in the second step to form a layered structure, and vertically thread the steel strand for the two layers of sub cofferdam frames, specifically, splice and align two long side cofferdam plates one 1, two long side cofferdam plates two 2, two short side cofferdam plates one 3, two short side cofferdam plates two 4 and two right angle cofferdam plates 5 along the vertical direction, and then vertically connect the layered two long side cofferdam plates one 1, the layered two long side cofferdam plates two 2, the layered two short side cofferdam plates one 3, the layered two short side cofferdam plates two 4 and the layered two right angle cofferdam plates 5 (the layered two right angle cofferdam plates 5 include four groups located at the four corners of the cuboid cofferdam frame).

[0056] When the steel strand is vertically arranged between the stacked cofferdam plates (between the two long side cofferdam plates one 1, between the two long side cofferdam plates two 2, between the two short side cofferdam plates one 3, between the two short side cofferdam plates two 4, between the two right angle cofferdam plates 5), the steel strand is arranged in the corresponding bellows from bottom to top, that is, the corresponding steel strand is respectively arranged into the lower end of each connecting hole and arranged out of the upper end, the steel alloy anchor plate is sleeved on the position of being arranged out, the limiting plate is installed, the hydraulic driving device is used to drive the jack to tension the prestressed steel strand to the set pressure, the excess steel strand is cut off, then the grouting and sealing are carried out in the bellows through the reserved grouting port, the water stop belt is placed at the joint and fixed, and the close fit is ensured, so that the connection between the stacked cofferdam plates is realized.

[0057] After the two long side cofferdam plates one 1, the two long side cofferdam plates two 2, the two short side cofferdam plates one 3, the two short side cofferdam plates two 4 and the two right angle cofferdam plates 5 (the two right angle cofferdam plates 5 include four groups at four corners of the cuboid cofferdam frame) are spliced, the side support rod one 17, the side support rod two 18, the side support rod three 19, the side support rod four 20, the middle support rod one 21 and the middle support rod two 22 are welded on the inner wall of the corresponding cofferdam plate according to the point position by using the crane, and the whole cofferdam frame is formed.

[0058] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as the limitation of the utility model. The ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A prestressed fabricated cofferdam structure suitable for bridge construction, characterized in that, The cofferdam plate group one and the cofferdam plate group two are parallel and symmetrically arranged, the cofferdam plate three and the cofferdam plate group four are parallel and symmetrically arranged, the cofferdam plate group one and the cofferdam plate group two are perpendicular to the cofferdam plate three and the cofferdam plate group four, the cofferdam plate group one and the cofferdam plate group three, the cofferdam plate group one and the cofferdam plate group four, the cofferdam plate group two and the cofferdam plate group three, and the cofferdam plate group two and the cofferdam plate group four are connected by the cofferdam plate group five respectively, and the cofferdam plate group one, the cofferdam plate group three, the cofferdam plate group two, the cofferdam plate group four and the plurality of cofferdam plate group five form a cuboid structure cofferdam frame. The cofferdam plate group one comprises at least two long-side cofferdam plates one arranged in a vertical stack, the cofferdam plate group two comprises at least two long-side cofferdam plates two arranged in a vertical stack, the cofferdam plate group three comprises at least two short-side cofferdam plates one arranged in a vertical stack, the cofferdam plate group four comprises at least two short-side cofferdam plates two arranged in a vertical stack, and the cofferdam plate group five comprises at least two right-angle cofferdam plates arranged in a vertical stack, wherein the right-angle cofferdam plate comprises two mutually perpendicular connecting plates, the long-side cofferdam plate one and the long-side cofferdam plate two are connected to the adjacent connecting plate one and parallel to each other, and the short-side cofferdam plate one and the short-side cofferdam plate two are connected to the adjacent connecting plate two and parallel to each other. Connecting holes one are arranged in the vertical direction between the long-side cofferdam plates one arranged in a vertical stack and between the long-side cofferdam plates two arranged in a vertical stack, and corrugated pipes one are arranged in the connecting holes one; connecting holes two are arranged in the vertical direction between the short-side cofferdam plates one arranged in a vertical stack and between the short-side cofferdam plates two arranged in a vertical stack, and corrugated pipes two are arranged in the connecting holes two; connecting holes three are arranged in the vertical direction between the right-angle cofferdam plates arranged in a vertical stack, and corrugated pipes three are arranged in the connecting holes three; connecting holes four are arranged in the horizontal longitudinal direction between the long-side cofferdam plates one and the right-angle cofferdam plates, and between the long-side cofferdam plates two and the right-angle cofferdam plates, and corrugated pipes four are arranged in the connecting holes four; connecting holes five are arranged in the horizontal transverse direction between the short-side cofferdam plates one and the right-angle cofferdam plates, and between the short-side cofferdam plates two and the right-angle cofferdam plates, and corrugated pipes five are arranged in the connecting holes five; the connecting holes three, the connecting holes four and the connecting holes five are arranged staggeredly.

2. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 1, characterized in that, The long-side cofferdam plate one and the short-side cofferdam plate one, the long-side cofferdam plate one and the short-side cofferdam plate two, the long-side cofferdam plate two and the short-side cofferdam plate one, and the long-side cofferdam plate two and the short-side cofferdam plate two are supported by side support rods respectively.

3. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 2, characterized in that, The long-side cofferdam plate one and the long-side cofferdam plate two are supported by a middle support rod.

4. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 3, characterized in that, The inner walls of the long-side cofferdam plate one, the long-side cofferdam plate two, the short-side cofferdam plate one and the short-side cofferdam plate two are provided with embedded steel plates respectively; the two ends of the side support rod are welded to the embedded steel plates respectively, and the two ends of the middle support rod are welded to the embedded steel plates respectively.

5. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 4, characterized in that, The inner walls of the long-side cofferdam plate one are provided with embedded steel plates one and embedded steel plates two on the two sides respectively, the inner walls of the long-side cofferdam plate two are provided with embedded steel plates three and embedded steel plates four on the two sides respectively, the inner walls of the short-side cofferdam plate one are provided with embedded steel plates five and embedded steel plates six on the two sides respectively, and the inner walls of the short-side cofferdam plate two are provided with embedded steel plates seven and embedded steel plates eight on the two sides respectively. The side support rod between the long side cofferdam plate one and the short side cofferdam plate one is a side support rod one, both ends of the side support rod one are welded on the pre-embedded steel plate one and the pre-embedded steel plate five respectively; the side support rod between the long side cofferdam plate one and the short side cofferdam plate two is a side support rod two, both ends of the side support rod two are welded on the pre-embedded steel plate two and the pre-embedded steel plate seven respectively; the side support rod between the long side cofferdam plate two and the short side cofferdam plate one is a side support rod three, both ends of the side support rod three are welded on the pre-embedded steel plate three and the pre-embedded steel plate six respectively; the side support rod between the long side cofferdam plate two and the short side cofferdam plate two is a side support rod four, both ends of the side support rod four are welded on the pre-embedded steel plate four and the pre-embedded steel plate eight respectively.

6. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 5, characterized in that, The middle support rod includes a middle support rod one and a middle support rod two welded between the long side cofferdam plate one and the long side cofferdam plate two; the middle part of the long side cofferdam plate one is symmetrically provided with a pre-embedded steel plate nine and a pre-embedded steel plate ten, and the middle part of the long side cofferdam plate two is symmetrically provided with a pre-embedded steel plate eleven and a pre-embedded steel plate twelve; both ends of the middle support rod one are welded between the pre-embedded steel plate nine and the pre-embedded steel plate eleven, and both ends of the middle support rod two are welded between the pre-embedded steel plate ten and the pre-embedded steel plate twelve.

7. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 1, characterized in that, The connecting plate one in the right-angle cofferdam plate is provided with a mortise one at the connection with the long side cofferdam plate one and the long side cofferdam plate two respectively, and the connecting plate two in the right-angle cofferdam plate is provided with a mortise two at the connection with the short side cofferdam plate one and the short side cofferdam plate two respectively; the connection between the long side cofferdam plate one, the long side cofferdam plate two and the connecting plate one is matched with the mortise one to be provided with a tenon groove one, and the connection between the short side cofferdam plate one, the short side cofferdam plate two and the connecting plate two is matched with the mortise two to be provided with a tenon groove two; the connecting plate one and the long side cofferdam plate one, the long side cofferdam plate two are connected through the mortise one and the tenon groove one, and the connecting plate two and the short side cofferdam plate one, the short side cofferdam plate two are connected through the mortise two and the tenon groove two.

8. The pre-stressed fabricated cofferdam structure suitable for bridge construction as claimed in claim 1 wherein, The connecting hole one, the connecting hole two, the connecting hole three, the connecting hole four and the connecting hole five all include a middle hole and a plurality of side holes distributed outside the middle hole in a circumferential direction; a corrugated pipe one is arranged in each of the middle hole and the side holes of the connecting hole one, a corrugated pipe two is arranged in each of the middle hole and the side holes of the connecting hole two, a corrugated pipe three is arranged in each of the middle hole and the side holes of the connecting hole three, a corrugated pipe four is arranged in each of the middle hole and the side holes of the connecting hole four, and a corrugated pipe five is arranged in each of the middle hole and the side holes of the connecting hole five.

9. The prestressed fabricated cofferdam structure suitable for bridge construction according to claim 8, characterized in that, The connecting hole one, the connecting hole two, the connecting hole three, the connecting hole four and the connecting hole five all include six side holes distributed outside the middle hole in a circumferential direction; seven-strand prestressed steel strands are arranged in each of the corrugated pipe one, the corrugated pipe two, the corrugated pipe three, the corrugated pipe four and the corrugated pipe five.

10. The pre-stressed fabricated cofferdam structure suitable for bridge construction according to claim 1, wherein, The cofferdam plate group one, the cofferdam plate group two, the cofferdam plate three and the cofferdam plate group four are all made of UHPC.

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