Steel sleeve box cofferdam structure of analog and fast assembly and construction method thereof

Abstract

The present application belongs to the technical field of bridge infrastructure structure, and particularly relates to a steel sleeve box cofferdam structure of modularization and rapid assembly and a construction method thereof. The present application provides a steel sleeve box cofferdam structure of modularization and rapid assembly, which can be assembled by setting modularized concave-convex plate units, end corner connecting piece units, inner side supporting rod units and screwing pieces on the assembling bottom plate units, so that: 1, the adjacent modularized concave-convex plate units can be inserted and screwed first, to ensure the sufficient stability of the side plate structure; 2, the side plate and the side plate are further reinforced by the end corner connecting piece units and the inner side supporting rod units, to finally ensure that the whole steel sleeve box cofferdam has sufficient enclosure support strength.

Description

Technical Field

[0001] This invention belongs to the field of bridge infrastructure structure technology, and in particular relates to a modular, rapid-assembly steel cofferdam structure and its construction method. Background Technology

[0002] A steel cofferdam is a temporary water-blocking structure used during the construction of bridge piers or abutments to first enclose the structure, then pump out the water, ultimately creating a waterless construction space. Common steel cofferdams typically consist of a base plate and side plates.

[0003] For example, Chinese utility model patent with patent publication number CN206916758U and publication date of January 23, 2018, discloses a steel cofferdam, including: cross-connecting piles, steel cofferdam plate, and top support steel bars.

[0004] The steel cofferdam in this utility model patent has advantages such as simple structure and convenient construction. However, in actual use, it also has at least two prominent shortcomings: 1. The steel cofferdam plate is a single piece, which is not only difficult to produce, but also inconvenient to transport; 2. There is a lack of necessary reinforcement structure between two adjacent steel cofferdam plates, which ultimately makes the rectangular box outline relatively unstable.

[0005] Therefore, further developments led to the emergence of various modular and prefabricated cofferdams, similar to the aforementioned modular rapid assembly method. For example, Chinese utility model patent CN213062061U, published on April 27, 2021, discloses a modular steel cofferdam, including side plates composed of several transverse distribution beams (I-beams) and vertical main beams. The transverse distribution beams (I-beams) have slotted I-beams and slotted steel channels at both ends, which are slidably connected. The vertical main beams have distribution beams, and the side plates have several first channel steels, with first I-beams internally connected to the first channel steels. The side plates are distributed around the bored piles, and both ends of the side plates are connected by spiral steel pipe columns.

[0006] The modular steel cofferdam in this utility model patent has the advantage of "breaking down the whole into parts," ensuring that the relatively small side panels are easy to produce and transport. However, its splicing structure is relatively simple, and the final cofferdam side panels have the disadvantages of relatively poor structural stability and insufficiently firm connections.

[0007] Therefore, in summary, there is an urgent need for a new type of steel cofferdam with optimized assembly method and relatively high structural stability. Summary of the Invention

[0008] This invention provides a modular, rapid-assembly steel cofferdam structure. By incorporating modular concave-convex plate units, corner connector units, inner support rod units, and bolted connections on the assembled base plate unit, it achieves the following: 1. Adjacent modular concave-convex plate units can be plugged in and then bolted together, ensuring sufficient stability of the side plate structure; 2. Corner connector units and inner support rod units further reinforce the side plates, ultimately ensuring sufficient protective support strength for the entire steel cofferdam.

[0009] In addition, the present invention also provides a construction method for the above-mentioned steel cofferdam structure. One step of the method is to set and prefabricate the shape and size of the modular concave-convex plate unit to ensure that the side plates can be successfully spliced.

[0010] The technical solution adopted by the present invention to solve the above problems is: a modular rapid assembly steel cofferdam structure, including an assembly base plate unit, a modular concave-convex plate unit disposed on the assembly base plate unit and used for assembling to form side plates, an end corner connector unit disposed on two adjacent side plates, an inner support rod unit disposed on two adjacent side plates, and a screw connector disposed on the modular concave-convex plate unit and used for connecting adjacent modular concave-convex plate units, end corner connector units, or inner support rod units.

[0011] A further preferred technical solution is that the assembled base plate unit includes two rectangular plates, two side grooves set on the rectangular plates and used to form the pile cap hole, and pile foundation hole set on the rectangular plates.

[0012] A further preferred technical solution is that the assembly base plate unit further includes vertical strips arranged in pairs on the upper surfaces of the two rectangular plates, with an L-shaped cross-section, for engaging and fixing the corners of the two adjacent side plates, and strip holes arranged on the corner vertical strips for installing the screws.

[0013] A further preferred technical solution is that the modular convex-concave plate unit includes a plate body, a grooved plate disposed on two adjacent sides of the plate body, a protruding plate disposed on two other adjacent sides of the plate body, and a plate body hole disposed on the grooved plate and the protruding plate for mounting the screw connector.

[0014] A further preferred technical solution is that the modular convex-concave plate unit further includes an inner stiffening plate disposed on the plate body.

[0015] A further preferred technical solution is that the end corner connector unit includes an L-shaped insertion block disposed on two adjacent side plates and used to engage the grooved plate, a slotted L-shaped block disposed on two adjacent side plates and used to insert the protruding plate, and a block hole disposed on the L-shaped insertion block and the slotted L-shaped block and used to install the screw connector.

[0016] A further preferred technical solution is that the inner support rod unit includes two fixed rods respectively disposed on the inner surfaces of two adjacent side plates, and a support rod disposed on the two fixed rods.

[0017] A further preferred technical solution is that the inner support rod unit further includes an end groove disposed on the fixed rod and the support rod, and used to insert and install the inner stiffening plate.

[0018] A further preferred technical solution is that the inner support rod unit further includes a countersunk hole disposed on the fixed rod and used for installing the screw connector, wherein the countersunk hole has an arc-shaped straight groove on the inner side of the end groove for passing through the screw connector.

[0019] A construction method for a modular, rapid-assembly steel cofferdam structure, wherein before the steel cofferdam is assembled, the shape and size of the modular concave-convex plate units are set and prefabricated. The shape of the modular concave-convex plate units is set to square, with side lengths of 3m, 2m, and 1m, or the shape of the modular concave-convex plate units is set to rectangle, with dimensions of length 3m and width 1m, length 2m and width 1m, and length 1m and width 1m. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the modular concave-convex plate unit in this invention.

[0022] Figure 3 This is a top-down view of the structure of the assembled base plate unit in this invention.

[0023] Figure 4 This is a schematic diagram of one method of using the screw connector in this invention.

[0024] Figure 5 This is a schematic diagram showing the position and shape of the L-shaped insertion block in this invention.

[0025] Figure 6 This is a schematic diagram showing the position and shape of the slotted L-shaped block in this invention.

[0026] Figure 7The diagram shows two different ways of using the inner support rod unit in this invention, viewed from a top-down angle.

[0027] Figure 8 This is a schematic diagram of the inner support rod unit in this invention.

[0028] Figure 9 This is a schematic diagram illustrating the usage of the end slot in this invention.

[0029] Figure 10 This is a schematic diagram illustrating the method of using the countersunk hole in this invention.

[0030] The meanings of the markings in the diagram are as follows:

[0031] platform a;

[0032] 1. Assembled base plate unit; 2. Modular concave-convex plate unit; 3. End corner connector unit; 4. Inner support rod unit; 5. Screw connector.

[0033] Rectangular plate 101, side groove 102, pile foundation hole 103, corner vertical bar 104, bar hole 105, plate body 201, grooved plate 202, protruding plate 203, plate body hole 204, inner stiffening plate 205, L-shaped insert block 301, grooved L-shaped block 302, fixing rod 401, support rod 402, end groove 403, countersunk hole 404. Detailed Implementation

[0034] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0035] As attached Figure 1-10 As shown, a modular, rapid-assembly steel cofferdam structure includes an assembly base plate unit 1, a modular convex-concave plate unit 2 disposed on the assembly base plate unit 1 and used to assemble side plates, an end corner connector unit 3 disposed on two adjacent side plates, an inner support rod unit 4 disposed on two adjacent side plates, and a screw connector 5 disposed on the modular convex-concave plate unit 2 and used to connect adjacent modular convex-concave plate units 2, end corner connector units 3, or inner support rod units 4.

[0036] In this embodiment, the steel cofferdam is rectangular in shape, comprising a base plate and four side plates. The base plate is the assembled base plate unit 1, and the side plates are composed of multiple modular concave-convex plate units 2 of varying sizes, with dimensions that match each other and all four sides being inserted and screwed together. Therefore, the steel cofferdam possesses the dual advantages of being "divided into parts" and having sufficient structural stability.

[0037] Furthermore, the corner connector unit 3 is used to further strengthen the connection strength between adjacent side plates. In other words, the corner connector unit 3 has a total of 4 functional parts, corresponding to the 4 side plates that are spliced ​​together at right angles. Similarly, the inner support rod unit 4 is also used to reinforce two adjacent side plates that are already at right angles.

[0038] Then there are the numerous screw connectors 5, which have the following three different usage scenarios:

[0039] 1. Some of the screw connectors 5 are only used for screwing and fixing two adjacent modular convex and concave plate units 2;

[0040] 2. Some of the screw connectors 5 are used to simultaneously fix two modular convex and concave plate units 2 and one end corner connector unit 3;

[0041] 3. Some of the screw connectors 5 are used to simultaneously fix two modular convex and concave plate units 2 and one inner support rod unit 4.

[0042] Ultimately, the splicing structure of the steel cofferdam was further reinforced.

[0043] The assembled base plate unit 1 includes two rectangular plates 101, two side grooves 102 disposed on the rectangular plates 101 for forming the foundation holes, and pile holes 103 disposed on the rectangular plates 101.

[0044] In this embodiment, the two side grooves 102 are joined together to form a rectangular groove, allowing the pier or bridge abutment to pass through. The pile foundation hole 103 serves a similar purpose, allowing the pile foundation to pass through.

[0045] The assembly base plate unit 1 also includes two vertical strips 104 respectively disposed on the upper surfaces of the two rectangular plates 101, with an L-shaped cross-section, used to engage and fix the corners of the two adjacent side plates, and strip holes 105 disposed on the corner vertical strips 104 for installing the screw connectors 5.

[0046] In this embodiment, the screw connector 5 is a combination of a bolt and a nut.

[0047] Furthermore, the vertical strip 104 at the corner is fixedly connected to the rectangular plate 101, with the outer right-angled side of the former close to or directly overlapping the right-angled side of the latter. The function of the vertical strip 104 at the corner is to simultaneously adhere to the outer surfaces of two adjacent side plates, thereby first providing lateral restraint to the rectangular frame composed of the four side plates in all directions.

[0048] Then, by combining the hole 105 on the strip and the screw 5, the vertical strip 104 at the end corner is connected to the side plate to ensure that the assembled base plate unit 1 and the side plate will not separate vertically.

[0049] Correspondingly, at this time, the screw connector 5, which connects the two modular convex and concave plate units 2 and the corner connector unit 3, also needs to be connected to the vertical strip 104 at the corner.

[0050] Therefore, the numerous bolts 5 can be bolts of various specifications with different lengths, or the bolt length can be uniformly set to be large enough.

[0051] The modular convex-concave plate unit 2 includes a plate body 201, a grooved plate 202 disposed on two adjacent sides of the plate body 201, a protruding plate 203 disposed on two other adjacent sides of the plate body 201, and a plate body hole 204 disposed on the grooved plate 202 and the protruding plate 203 for mounting the screw connector 5.

[0052] In this embodiment, the modular concept of the steel cofferdam is reflected in the size and shape of the plate 201. Its size and shape can be appropriately adjusted within a certain range to ensure that the final splicing forms a complete rectangular side plate.

[0053] In addition, in order to improve the splicing strength between adjacent modular concave and convex plate units 2, either of the two grooved plates 202 or the two protruding plates 203 can be selected to form an integral "L-shaped" plate.

[0054] Finally, the groove plate 202 can be a single "U-shaped" plate, or it can be formed by two single plates to create a groove shape.

[0055] The modular convex and concave plate unit 2 also includes an inner stiffening plate 205 disposed on the plate body 201.

[0056] In this embodiment, the inner stiffening plate 205 is used to reinforce the plate body 201 itself, preventing the plate body 201 from bending easily, and it will not affect the insertion and screwing effect at the groove plate 202 and the protruding plate 203.

[0057] The end corner connector unit 3 includes an L-shaped insertion block 301 disposed on two adjacent side plates and used to engage the groove plate 202, a slotted L-shaped block 302 disposed on two adjacent side plates and used to insert the protruding plate 203, and a block hole disposed on the L-shaped insertion block 301 and the slotted L-shaped block 302 and used to install the screw connector 5.

[0058] In this embodiment, a single L-shaped insert block 301 simultaneously inserts into all the assembled base plate units 1 on the side edges of the two side plates, and the same applies to the slotted L-shaped block 302. Therefore, the vertical strip 104 at the end corner, the L-shaped insert block 301, and the slotted L-shaped block 302 all require at least one row of bolt through holes from top to bottom, namely the strip hole 105 and the block hole.

[0059] In addition, the width of the slotted L-shaped block 302 is greater than that of the L-shaped insert block 301. The former is the same as the latter, which is thickened first and then slotted at both ends.

[0060] In addition, the grooved L-shaped block 302 can be fitted to the inner side of the vertical strip 104 at the end corner, and the L-shaped insert block 301 does not need to fit to the vertical strip 104 at the end corner by expanding its middle part.

[0061] The inner support rod unit 4 includes two fixed rods 401 respectively disposed on the inner surfaces of two adjacent side plates, and a support rod 402 disposed on the two fixed rods 401.

[0062] In this embodiment, the number of inner support rod units 4 is 4 or 8, which are evenly arranged on the inner side of the 4 corners of the steel cofferdam.

[0063] In addition, the fixing rod 401 and the support rod 402 are integrally formed, and the fixing rod 401 can be optionally set on the plate 201 or on the inner stiffening plate 205.

[0064] The inner support rod unit 4 also includes an end groove 403 disposed on the fixed rod 401 and the support rod 402 and used to insert and install the inner stiffening plate 205.

[0065] In this description, the end groove 403 is partially disposed on the support rod 402 in order to ensure that even the relatively wide inner stiffening plate 205 can be fully inserted into the end groove 403. At this time, the fixing rod 401 simultaneously abuts against the inner side of the plate 201, which can further reinforce the side plate.

[0066] The inner support rod unit 4 also includes a countersunk hole 404 disposed on the fixed rod 401 and used for installing the screw connector 5. The countersunk hole 404 has an arc-shaped straight groove on the inner side of the end groove 403 for passing through the screw connector 5.

[0067] In this embodiment, the third installation method of the inner support rod unit 4 is to install the fixing rod 401 at the splicing point of the assembly base plate unit 1, that is, to use the screw connector 5 again.

[0068] The countersunk hole 404 is used to insert a bolt first, and finally to stably press the fixing rod 401 onto the groove plate 202 and the protruding plate 203.

[0069] Finally, the countersunk hole 404 spans the end groove 403. The purpose of this arrangement is to ensure that even relatively large bolts can be installed smoothly by properly prying apart the two plates that have been "split in two" at the fixing rod 401.

[0070] A construction method for a modular, rapid-assembly steel cofferdam structure, wherein before the steel cofferdam is assembled, the shape and size of the modular concave-convex plate unit 2 are set and prefabricated. The shape of the modular concave-convex plate unit 2 is set to be square, and the size is side lengths of 3m, 2m and 1m, or the shape of the modular concave-convex plate unit 2 is set to be rectangular, and the size is length 3m and width 1m, length 2m and width 1m and length 1m and width 1m.

[0071] In this embodiment, when designing the shape and size of the modular convex and concave plate unit 2, the above construction method needs to ensure that an indefinite number of the modular convex and concave plate units 2 can be spliced ​​into a complete rectangular side plate.

[0072] The aforementioned shape and size refer to the plate 201. Regardless of how the shape and size of the plate 201 change, the groove plate 202 and the protruding plate 203 are still installed on two adjacent sides of the plate 201, ensuring that the splicing effect of the plate 201 remains unchanged and unaffected when the plate 201 is modularized.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of the present invention. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A modular, rapidly assembled steel cofferdam structure, characterized in that: It includes an assembly base plate unit (1), a modular convex and concave plate unit (2) disposed on the assembly base plate unit (1) and used to assemble and form a side plate, an end corner connector unit (3) disposed on two adjacent side plates, an inner support rod unit (4) disposed on two adjacent side plates, and a screw connector (5) disposed on the modular convex and concave plate unit (2) and used to connect adjacent modular convex and concave plate units (2) or end corner connector units (3) or inner support rod units (4). The assembled base plate unit (1) includes two rectangular plates (101), two side grooves (102) set on the rectangular plates (101) and used to form the pile cap holes, and pile foundation holes (103) set on the rectangular plates (101). The assembly base plate unit (1) also includes vertical strips (104) at the corners of the two rectangular plates (101) respectively, with an L-shaped cross-section, for engaging and fixing the two adjacent side plates, and strip holes (105) on the vertical strips (104) at the corners for installing the screw connectors (5). The modular convex-concave plate unit (2) includes a plate body (201), a grooved plate (202) disposed on two adjacent sides of the plate body (201), a protruding plate (203) disposed on two other adjacent sides of the plate body (201), and a plate body hole (204) disposed on the grooved plate (202) and the protruding plate (203) for mounting the screw connector (5). The modular convex-concave plate unit (2) also includes an inner stiffening plate (205) disposed on the plate body (201). The inner support rod unit (4) includes two fixed rods (401) respectively disposed on the inner surfaces of two adjacent side plates, and a support rod (402) disposed on the two fixed rods (401). The inner support rod unit (4) also includes an end groove (403) disposed on the fixed rod (401) and the support rod (402) and used to insert and install the inner stiffening plate (205). The inner support rod unit (4) also includes a countersunk hole (404) disposed on the fixed rod (401) and used for installing the screw connector (5). The countersunk hole (404) has an arc-shaped straight groove on the inner side of the end groove (403) for passing through the screw connector (5).

2. The modular, rapid-assembly steel cofferdam structure according to claim 1, characterized in that: The corner connector unit (3) includes an L-shaped insert block (301) disposed on two adjacent side plates and used to engage the groove plate (202), a slotted L-shaped block (302) disposed on two adjacent side plates and used to insert the protruding plate (203), and a hole on the block disposed on the L-shaped insert block (301) and the slotted L-shaped block (302) and used to install the screw connector (5).

3. A construction method for a modular, rapid-assembly steel cofferdam structure as described in claim 1, characterized in that: Before the steel cofferdam is assembled and constructed, the shape and size of the modular concave-convex plate unit (2) are set and prefabricated. The shape of the modular concave-convex plate unit (2) is set to be square, and the size is side length 3m, 2m and 1m. Alternatively, the shape of the modular concave-convex plate unit (2) is set to be rectangular, and the size is length 3m and width 1m, length 2m and width 1m and length 1m and width 1m.

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