Novel double-wall steel cofferdam wall body structure

Abstract

The utility model discloses a novel double-wall steel cofferdam wall body structure which comprises an inner wall plate and an outer wall plate, a plurality of partition plates vertically arranged at intervals and a plurality of annular plates horizontally arranged are arranged between the inner wall plate and the outer wall plate, a plurality of vertical secondary beams are correspondingly arranged on the inner wall body, close to the inner side, of the inner wall plate and the outer wall plate, and the vertical secondary beams are connected with the annular plates in a welded mode. A horizontal cross brace is welded on the annular plate, and two ends of the horizontal cross brace are respectively supported on the inner wall plate and the outer wall plate; a plurality of shear nails are correspondingly arranged on the inner wall body, close to the inner side, of the inner wall plate and the outer wall plate, the shear nails and the vertical secondary beams are arranged at intervals, a plurality of stiffening steel bars are vertically welded outside the vertical secondary beams, a baffle is arranged between the upper annular plate and the lower annular plate, a local dry pouring area is formed, and concrete is poured in the local dry pouring area. According to the utility model, the local dry pouring area concrete is poured in advance, so that the cooperative performance of the cofferdam steel wall body and the sandwich wall concrete is improved, the concrete pouring quality is ensured, and the ultrahigh water head difference is resisted.

Description

Technical Field

[0001] The utility model relates to the field of steel cofferdam construction. More specifically, the utility model relates to a novel double-wall steel cofferdam wall structure. Background Art

[0002] In the construction of deep-water foundations of cross-river and cross-sea bridges, double-wall steel cofferdams are widely used to provide a dry working environment for the construction of the bearing platform. As the main load-bearing component to resist the internal and external water head differences, the conventional structure adopts inner and outer wall plates, and vertical secondary beams are welded on the wall plates to form a beam-slab structure. The beam-slab inner and outer wall plates are connected by horizontal ring plates, horizontal cross braces and diaphragm plates to resist external loads. In order to obtain greater strength and stiffness to withstand ultra-high water head differences, the inner wall of the cofferdam is usually filled with concrete underwater, and the steel wall and the concrete in the sandwich wall form a composite structure to work together. However, during the construction, due to the difficulty in ensuring the quality of the underwater casting of the concrete in the sandwich wall, there are phenomena such as floating slurry or hollowing, which affect the collaborative stress performance. And due to the large thickness of the wall, the steel wall and the concrete in the sandwich wall are only bonded by small angle steel members in a ribbed pattern, and the bonding performance cannot be ensured. The theoretical calculation assumes that the steel wall and the concrete in the sandwich wall are treated with common joints, which is relatively unsafe compared with the actual situation, resulting in greater safety risks in the design and construction of the steel cofferdam. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a novel double-wall steel cofferdam wall structure, which improves the collaborative performance of the steel wall of the cofferdam and the concrete in the sandwich wall, ensures the quality of concrete casting, and resists ultra-high water head differences by pre-casting the concrete in the local dry-casting area.

[0004] The technical solution adopted by the utility model to solve this technical problem is: a novel double-wall steel cofferdam wall structure is provided, including: an inner wall plate and an outer wall plate, and a plurality of diaphragm plates arranged at vertical intervals and a plurality of horizontal ring plates are arranged between the inner wall plate and the outer wall plate. A plurality of vertical secondary beams are correspondingly arranged on the inner side walls of the inner wall plate and the outer wall plate. The ring plate is provided with a notch at the position of the vertical secondary beam, and the vertical secondary beam is welded to the ring plate. A horizontal cross brace is welded on the ring plate, and both ends of the horizontal cross brace are respectively supported on the inner wall plate and the outer wall plate;

[0005] A plurality of shear studs are correspondingly arranged on the inner side walls of the inner wall plate and the outer wall plate. The shear studs are arranged at intervals with the vertical secondary beams. A plurality of stiffening steel bars are perpendicularly welded outside the plurality of vertical secondary beams. A baffle is arranged between the upper and lower ring plates to form a local dry-casting area, and concrete is cast in the local dry-casting area.

[0006] Preferably, the novel double-wall steel cofferdam wall structure includes a steel mesh, and the steel mesh is arranged in the local dry-casting area and is perpendicularly welded to the upper and lower ring plates.

[0007] Preferably, for the novel double-wall steel cofferdam wall structure, the ring plate is a square-shaped plate body, and circular holes are provided on the ring plate.

[0008] Preferably, for the novel double-wall steel cofferdam wall structure, the diameter of the circular holes on the ring plate is 5 - 8 cm.

[0009] Preferably, for the novel double-wall steel cofferdam wall structure, a number of vertical secondary beams are correspondingly provided on both sides of the bulkhead plate.

[0010] Preferably, for the novel double-wall steel cofferdam wall structure, one end of each two horizontal braces is connected, and the other ends are symmetrically arranged obliquely, so that each two horizontal braces form a V-shaped structure.

[0011] Preferably, for the novel double-wall steel cofferdam wall structure, shear studs are provided on the baffle plate and on the ring plate within the local dry-cast area.

[0012] The present utility model has at least the following beneficial effects:

[0013] 1. Shear studs and stiffening steel bars are provided on the steel wall plate in the area where the wall body is subjected to large forces, so as to increase the bonding strength between the sandwich concrete and the steel wall body and ensure the coordinated force of the wall body composite structure.

[0014] 2. A local dry-cast area is provided at the place where the sandwich concrete is subjected to large forces and is pre-cast during the assembly and lowering process of the cofferdam. A baffle plate, multiple shear studs and stiffening steel bars are provided in the local dry-cast area, and at the same time, a steel mesh is welded to the upper and lower ring plates to ensure the casting quality of the local dry-cast area.

[0015] 3. Circular holes are opened on the ring plate in the underwater casting area to ensure the underwater casting quality of the concrete.

[0016] Other advantages, objectives and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a top view of a novel double-wall steel cofferdam wall structure of the present utility model;

[0018] Figure 2 is a top view of area A in a novel double-wall steel cofferdam wall structure of the present utility model;

[0019] Figure 3 is a side view of area A in a novel double-wall steel cofferdam wall structure of the present utility model;

[0020] Figure 4 is a structural diagram of the arrangement of stiffening steel bars and vertical secondary beams in a novel double-wall steel cofferdam wall structure of the present utility model;

[0021] Figure 5 It is a schematic diagram of the circular holes in the ring plate in the wall structure of a new type of double-wall steel cofferdam of the present utility model;

[0022] Explanation of the reference numerals in the drawings: 1, inner wall plate; 2, outer wall plate; 3, partition board; 4, ring plate; 5, vertical secondary beam; 6, horizontal cross brace; 7, shear stud; 8, stiffening steel bar; 9, baffle; 10, concrete; 11, steel mesh; 12, circular hole; A, area with large wall stress; B, local dry-cast area. Specific embodiments

[0023] The following further describes the present utility model in detail with reference to the drawings, so that those skilled in the art can implement it according to the text of the specification.

[0024] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments described below are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles defined in the following description can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present utility model.

[0025] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present utility model.

[0026] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, and in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the number.

[0027] Such as Figures 1-5As shown in the figure, a preferred embodiment of the present utility model provides a novel double-wall steel cofferdam wall structure, including: an inner wall plate 1 and an outer wall plate 2. There are several vertically spaced partition plates 3 and several horizontally arranged ring plates 4 between the inner wall plate 1 and the outer wall plate 2. A number of vertical secondary beams 5 are correspondingly arranged on the inner side walls of the inner wall plate 1 and the outer wall plate 2. The ring plate 4 is provided with notches at the positions of the vertical secondary beams 5. The vertical secondary beams 5 are welded to the ring plate 4. A horizontal cross brace 6 is welded on the ring plate 4. Both ends of the horizontal cross brace 6 are respectively supported on the inner wall plate 1 and the outer wall plate 2;

[0028] In the area A where the wall is subjected to greater force, a number of shear studs 7 are correspondingly arranged on the inner side walls of the inner wall plate 1 and the outer wall plate 2. The shear studs 7 are arranged at intervals with the vertical secondary beams 5. A number of stiffening steel bars 8 are perpendicularly welded outside the several vertical secondary beams 5 to increase the bonding strength between the sandwich concrete and the steel wall, ensuring the coordinated force of the wall composite structure. At the place where the sandwich concrete is subjected to greater force, a baffle 9 is arranged between the upper and lower ring plates 4 to form a local dry-casting area B, and concrete 10 is poured in the local dry-casting area B.

[0029] In the above technical solution, by setting a local dry-casting area B at the place where the sandwich concrete is subjected to greater force and pouring the concrete 10 before the cofferdam lands, the quality of concrete pouring is improved to cope with the ultra-high water head difference, obtaining greater strength and improving the coordinated performance between the steel wall of the cofferdam and the sandwich concrete.

[0030] Further, the novel double-wall steel cofferdam wall structure includes a steel mesh 11. The steel mesh 11 is arranged in the local dry-casting area B and is perpendicularly welded to the upper and lower ring plates 4. The steel mesh 11 can enhance the crack resistance of the concrete and ensure the pouring quality of the concrete 10 in the local dry-casting area B.

[0031] Further, in the novel double-wall steel cofferdam wall structure, the ring plate 4 is an O-shaped plate body, and circular holes 12 are opened on the ring plate 4 to ensure the underwater pouring quality of the sandwich concrete.

[0032] Further, in the novel double-wall steel cofferdam wall structure, the diameter of the circular holes 12 on the ring plate 4 is 5 - 8 cm.

[0033] Further, in the novel double-wall steel cofferdam wall structure, a number of vertical secondary beams 5 are correspondingly arranged on both sides of the partition plate 3 to improve the stability, torsional resistance and local stability of the partition plate 3.

[0034] Further, in the novel double-wall steel cofferdam wall structure, one end of every two horizontal cross braces 6 is connected, and the other ends are symmetrically arranged obliquely, so that every two horizontal cross braces 6 form a V-shaped structure. The V-shaped structure can effectively improve the supporting capacity of the horizontal cross braces 6.

[0035] Furthermore, in the novel double-wall steel cofferdam wall structure, shear studs 7 are provided on the baffle 9 and the ring plate 4 within the local dry-cast area B to resist the shear force within the local dry-cast area B.

[0036] The present utility model also provides a construction method using the novel double-wall steel cofferdam wall structure, which is as follows:

[0037] Step 1: When fabricating the cofferdam, shear studs 7 and stiffening steel bars 8 are provided on the outer wall plate 2 and the inner wall plate 1 of the wall in the area A where the wall is subjected to greater force. A local dry-cast area B is provided on the wall. The local dry-cast area B is composed of a baffle 9, multiple shear studs 7, stiffening steel bars 8, a steel mesh 11, etc., and circular holes 12 are formed on the ring plate 4.

[0038] Step 2: After the cofferdam is lowered into the water, during the process of splicing and extending in the self-floating state, select an appropriate time to pour the concrete 10 in the local dry-cast area B, and vibrate it thoroughly to ensure the pouring quality.

[0039] Step 3: The concrete between the double walls of the double-wall steel cofferdam in the remaining positions is poured underwater in sections during the process of dredging and sinking after the cofferdam lands.

[0040] Step 4: After the double-wall steel cofferdam sinks in place, pour the bottom-sealing concrete. The steel wall and the concrete between the walls act as a combined structure to jointly resist the ultra-high water head difference.

[0041] Although the implementation schemes of the present utility model have been disclosed above, it is not limited to only the applications listed in the specification and the implementation modes. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the illustrated examples here.

Claims

1. A novel double-wall steel cofferdam wall structure, characterized in that, It includes an inner wall panel and an outer wall panel. Between the inner wall panel and the outer wall panel, there are several vertically spaced partition plates and several horizontally arranged ring plates. Corresponding to the inner side wall bodies of the inner wall panel and the outer wall panel, there are several vertical secondary beams. The ring plates are provided with notches at the positions of the vertical secondary beams. The vertical secondary beams are welded to the ring plates. Horizontal cross braces are welded on the ring plates, and the two ends of each horizontal cross brace are respectively supported on the inner wall panel and the outer wall panel. Corresponding to the inner side wall bodies of the inner wall panel and the outer wall panel, there are several shear studs. The shear studs are arranged at intervals with the vertical secondary beams. Several stiffening steel bars are perpendicularly welded outside the several vertical secondary beams. A baffle is arranged between the upper and lower ring plates to form a local dry-cast area, and concrete is cast in the local dry-cast area.

2. The novel double-wall steel cofferdam wall structure according to claim 1, characterized in that, It includes a steel mesh, and the steel mesh is arranged in the local dry-cast area and is perpendicularly welded to the upper and lower ring plates.

3. The novel double-wall steel cofferdam wall structure according to claim 1, characterized in that, The ring plate is a square-shaped plate body, and round holes are formed in the ring plate.

4. The novel double-wall steel cofferdam wall structure according to claim 3, characterized in that, The diameter of the round holes in the ring plate is 5 - 8 cm.

5. The novel double-wall steel cofferdam wall structure according to claim 1, wherein Several vertical secondary beams are correspondingly arranged on both sides of the partition plate.

6. The novel double-wall steel cofferdam wall structure according to claim 1, characterized in that, One ends of every two horizontal cross braces are connected, and the other ends are symmetrically arranged obliquely, so that every two horizontal cross braces form a V-shaped structure.

7. The novel double-wall steel cofferdam wall structure according to claim 1, characterized in that, Shear studs are arranged on the baffle and on the ring plates in the local dry-cast area.

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