A segmented cofferdam

Abstract

The application discloses a kind of assembled cofferdams, comprising: coaming;Base for installing the coaming, the coaming has several, and gap fit between adjacent coaming;Second fixed frame is used to reinforce and limit the upper side of several coaming, so that coaming cannot move;Supporting mechanism is arranged between several coaming, for supporting coaming, so that coaming keeps vertical state;Pull rod assembly is arranged between the supporting mechanism and second fixed frame, and the supporting mechanism includes multiple elastic members.The beneficial effect is that four coaming are supported by supporting mechanism, to avoid water impact to cause coaming to bend inward, when water impact coaming, coaming extrudes supporting mechanism, and the elastic member of supporting mechanism will move and pull down second fixed frame by pull rod assembly, so that second fixed frame presses down coaming, so that coaming is more firmly connected with first fixed frame, and the scheme has less installation steps, is convenient for construction, and also has sufficient strength.

Description

Technical Field

[0001] This invention relates to the field of water body construction technology, specifically to a prefabricated cofferdam. Background Technology

[0002] There are many methods for underwater foundation construction. For water depths exceeding 10m, double-walled steel cofferdams or steel pipe pile cofferdams are generally chosen. For water depths less than 5m, earth-rock cofferdams, single-walled steel cofferdams, or steel sheet pile cofferdams are generally chosen. However, the construction techniques involved are very broad, the selection conditions are complex, and there are many determining factors.

[0003] In existing technologies, sheet pile cofferdams are generally suitable for geological conditions that are easy to vibrate and drive, such as silt layers, silty clay layers, and silty sand layers. Existing cofferdams have the problem of complicated installation procedures. Specifically, the steel plates of the cofferdam are not easy to connect, and the steel plates lack corresponding support, making them unable to withstand the lateral pressure of the bottom sealing concrete pouring and the impact of water flow before the bottom sealing of the steel sheet pile cofferdam in water is poured. For construction in rocky areas, steel plates are difficult to drive directly into the riverbed. In light of the above issues, we propose a modular cofferdam. Summary of the Invention

[0004] The purpose of this invention is to provide a modular cofferdam to solve the above-mentioned problems, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a prefabricated cofferdam, comprising: Enclosures; A base for mounting the enclosure panels, wherein there are a plurality of enclosure panels and adjacent enclosure panels are fitted with a clearance fit. The second fixing frame is used to reinforce and limit the upper side of several of the enclosure panels, so that the enclosure panels cannot move. A support mechanism is provided between several of the enclosure panels to support the enclosure panels and keep them in a vertical position. A pull rod assembly is provided between the support mechanism and the second fixed frame. The support mechanism includes multiple elastic elements, each of which supports a number of enclosures. When an elastic element is pushed by an enclosure, the other end of the elastic element pulls down the second fixed frame through the pull rod assembly.

[0006] Using the above-mentioned modular cofferdam, setting a base can improve the firmness of the cofferdam after installation. First, the base is fixed on the riverbed, and then several cofferdam panels are inserted into the base. The four cofferdam panels and the base can form a cavity, which prevents external water from entering the cavity. The second fixing frame is placed on the several cofferdam panels to further fix and limit the position of the cofferdam panels. The support mechanism and tie rod assembly are placed between the four panels. The support mechanism is used to support the four panels and prevent the panels from bending inward due to water flow impact. When the water flow impacts the panels, the panels squeeze the support mechanism. At that time, the elastic element of the support mechanism will move and pull the second fixed frame downward through the tie rod assembly, so that the second fixed frame presses down on the panels, making the connection between the panels and the first fixed frame more secure.

[0007] Preferably, the base includes a first fixing frame, which is rectangular and has a first positioning groove inside. Several of the surrounding plates are inserted into the first positioning groove, and anchor rods are vertically installed on all four sides of the base.

[0008] Preferably, the surface of the enclosure is provided with a plurality of vertical reinforcing cylinders, and the anchor rod is inserted into the corresponding reinforcing cylinder.

[0009] Preferably, the support mechanism includes a support frame, which is rectangular, and elastic elements are provided on all four sides of the support frame, with the surface of the support frame contacting the four surrounding plates respectively.

[0010] Preferably, the elastic element includes a fixing frame, which is mounted on a support frame. A sliding rod is slidably mounted on the support frame, and a top plate is provided at the end of the sliding rod. The support frame has four through holes corresponding to the top plate, and the top plate passes through the through holes to contact the surrounding plate.

[0011] Preferably, the pull rod assembly includes four pull rods and four top blocks. The pull rods are mounted on the second fixed frame, and the lower ends of the pull rods are fixed with inclined plates. The four top blocks are in contact with the four inclined plates respectively.

[0012] Preferably, the side of the top block that contacts the inclined plate is set as an inclined surface, and the side of the inclined plate closest to the top block is the lower end of the inclined surface of the inclined plate.

[0013] Preferably, the second fixing frame is rectangular, and a second positioning groove is provided inside the second fixing frame, and the upper side of the multiple side panels are inserted into the second positioning groove.

[0014] Preferably, the anchor rod body is rectangular with a pointed bottom, and the four anchor rods are respectively located in the middle of the four sides of the first fixed frame.

[0015] The beneficial effects are: 1. Setting up a base can improve the stability of the installed enclosure. The base is easier to fix to the riverbed than the enclosure. The base has anchor rods that can be driven into even rocky areas. The four enclosures and the base can form a cavity. The second fixing frame is placed on the enclosures to further fix and limit the enclosures. The four enclosures are supported by a support mechanism to prevent the enclosures from bending inward due to water flow impact. When the water flow impacts the enclosures, the enclosures squeeze the support mechanism. At that time, the elastic element of the support mechanism will move and pull the second fixing frame down through the tie rod assembly, so that the second fixing frame presses down on the enclosures, making the connection between the enclosures and the first fixing frame more secure. This solution has fewer installation steps, is convenient for construction, and also has sufficient strength. 2. By setting several vertical reinforcing cylinders, the bending resistance of the enclosure can be improved. At the same time, the reinforcing cylinders can connect the enclosure to the anchor bolts, further improving the stability of the enclosure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the first fixed frame of the present invention; Figure 3 This is a three-dimensional structural diagram of the support mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the elastic element and tie rod assembly of the present invention; Figure 5 This is the present invention. Figure 4 Enlarged structural diagram at point A in the middle.

[0018] The annotations in the attached figures are explained as follows: 1. Base; 2. Enclosure; 3. Reinforcing cylinder; 4. Anchor bolt; 5. First fixing frame; 6. Support mechanism; 7. Second fixing frame; 8. First positioning groove; 9. Tie rod assembly; 10. Second positioning groove; 11. Support frame; 12. Through hole; 13. Elastic element; 14. Fixing frame; 15. Slide rod; 16. Top plate; 17. Spring; 18. Top block; 19. Inclined plate; 20. Tie rod. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] See Figures 1-5 As shown, the present invention provides a prefabricated cofferdam, comprising: Enclosure 2; The base 1 is used to install the surrounding panels 2. There are several surrounding panels 2, and the adjacent surrounding panels 2 are fitted with a gap. Setting the base 1 can improve the firmness of the surrounding panels 2 after installation. First, the base 1 is fixed on the riverbed, and then several surrounding panels 2 are inserted into the base 1 respectively. The four surrounding panels 2 and the base 1 can form a cavity. Furthermore, the base 1 and the enclosure 2 are designed as separate units, which facilitates the transportation of the device and also makes it easier to drive the base 1 into the riverbed. If the base 1 and the enclosure 2 were designed as a single unit, it would be inconvenient to transport.

[0021] The second fixing frame 7 is used to reinforce and limit the upper side of several enclosure panels 2, so that the enclosure panels 2 cannot move. The second fixing frame 7, together with the base 1, can better limit the enclosure panels 2 and prevent the upper side of the enclosure panels 2 from shaking.

[0022] The support mechanism 6 is set between several enclosure panels 2 to support the enclosure panels 2 and keep the enclosure panels 2 in a vertical state. After the enclosure panels 2 are placed in the water, the load on the enclosure panels 2 is relatively large. The support mechanism 6 can prevent the enclosure panels 2 from deforming. A pull rod assembly 9 is provided between the support mechanism 6 and the second fixed frame 7. The support mechanism 6 includes multiple elastic elements 13, which support multiple enclosure plates 2 respectively. When the elastic elements 13 are pushed by the enclosure plates 2, the other end of the elastic elements 13 pulls down the second fixed frame 7 through the pull rod assembly 9. The support mechanism 6 and the pull rod assembly 9 have a linkage effect. The pressure on the support mechanism 6 will be converted into downward pressure on the second fixed frame 7 through the pull rod assembly 9. When the water flow impacts the enclosure plate 2, the enclosure plate 2 squeezes the support mechanism 6. At that time, the elastic elements 13 of the support mechanism 6 will move and pull down the second fixed frame 7 through the pull rod assembly 9, so that the second fixed frame 7 presses down on the enclosure plate 2, making the enclosure plate 2 more firmly connected to the first fixed frame 5.

[0023] As an optional implementation, the base 1 includes a first fixing frame 5, which is rectangular and has a first positioning groove 8 inside. Several surrounding plates 2 are inserted into the first positioning groove 8. Anchor rods 4 are vertically installed on the four sides of the base 1. The anchor rods 4 penetrate into the riverbed, which can improve the stability of the base 1. The connection between the base 1 and the surrounding plates 2 is simple and stable. The first positioning groove 8 can limit the surrounding plates 2, and after the four surrounding plates 2 are inserted into the first positioning groove 8, their edges can just make close contact.

[0024] Steel sheet pile cofferdams are generally suitable for geological conditions where vibratory driving is easy, such as silt layers, silty clay layers, and silty sand layers. There are two main construction methods for bare rock foundations: one is a double-walled or single-walled steel cofferdam. If steel sheet piles are used, pilot-drilling is required. However, double-walled or single-walled steel cofferdams have long construction times, large equipment investments, and high costs. If rotary drilling is used for pilot-drilling, the cost of drilling and breaking the bedrock around the foundation pit is very high, and the construction efficiency is slow for slightly weathered or other hard rock layers, often making it difficult to guarantee the construction period. Therefore, regardless of the method used, its limitations are significant.

[0025] The main challenges in using sheet pile support in bare rock foundation construction are that the sheet pile cofferdam cannot be inserted into the rock strata, cannot reach the anchoring depth, cannot resist the lateral pressure of the bottom sealing concrete pouring, and cannot withstand the impact stability of water flow before the bottom sealing of the sheet pile cofferdam in water. This solution adopts a split design, that is, the combination of base 1 and multiple cofferdam plates 2, which can more easily anchor the cofferdam and facilitate the installation of cofferdam plates 2. After the cofferdam plates 2 are installed, the two adjacent cofferdam plates 2 are in close contact with each other.

[0026] The surface of the enclosure 2 is provided with several vertical reinforcing cylinders 3, and the anchor rods 4 are inserted into the corresponding reinforcing cylinders 3. The reinforcing cylinders 3 can improve the bending resistance of the enclosure 2, and at the same time, the enclosure 2 can be connected to the anchor rods 4 through the reinforcing cylinders 3, which further improves the stability of the enclosure 2.

[0027] The support mechanism 6 includes a support frame 11, which is rectangular. Each of the four sides of the support frame 11 is provided with an elastic element 13. The surface of the support frame 11 contacts the four surrounding plates 2 respectively. The support mechanism 6 supports the four surrounding plates 2 simultaneously through the support frame 11 and the four elastic elements 13, which has a double insurance effect. Furthermore, the superior deformation performance of the elastic element 13 can be used to pull down the second fixed frame 7 through the pull rod assembly 9.

[0028] The elastic element 13 includes a fixed frame 14, which is mounted on a support frame 11. A slide rod 15 is slidably mounted on the support frame 11, and a top plate 16 is provided at the end of the slide rod 15. The support frame 11 has four through holes 12 corresponding to the top plate 16. The top plate 16 passes through the through holes 12 and contacts the surrounding plate 2. When the surrounding plate 2 is impacted by water flow, it will push the top plate 16, which in turn pushes the slide rod 15.

[0029] The pull rod assembly 9 includes four pull rods 20 and four top blocks 18. The pull rods 20 are mounted on the second fixed frame 7. An inclined plate 19 is fixed to the lower end of the pull rod 20, and the four top blocks 18 are in contact with the four inclined plates 19 respectively. The sliding rod 15 drives the top blocks 18 to move, so that the top blocks 18 are close to the inclined plates 19. After the inclined plates 19 are supported by the top blocks 18, they will move downward due to the inclined surface, which will drive the pull rods 20 to move downward, and pull down the second fixed frame 7 through the pull rods 20.

[0030] The side of the top block 18 that contacts the inclined plate 19 is set as an inclined surface, and the side of the inclined plate 19 closest to the top block 18 is the lower end of the inclined surface of the inclined plate 19.

[0031] The second fixing frame 7 is rectangular, and a second positioning groove 10 is provided inside the second fixing frame 7. The upper sides of the multiple surrounding plates 2 are all inserted into the second positioning groove 10, and the second fixing frame 7 is fitted with the four surrounding plates 2 with a clearance.

[0032] The anchor rod 4 has a rectangular body with a pointed bottom. The four anchor rods 4 are respectively located in the middle of the four sides of the first fixed frame 5. This design makes it easy to weld the anchor rods 4 onto the first fixed frame 5, and the position of the anchor rods 4 can ensure the stability of the first fixed frame 5.

[0033] Using the above structure, setting the base 1 can improve the firmness of the enclosure 2 after installation. First, the base 1 is fixed on the riverbed, and then several enclosures 2 are inserted into the base 1 respectively. The four enclosures 2 and the base 1 can form a cavity, and external water cannot enter the cavity. The second fixing frame 7 is placed on the several enclosures 2 to further fix and limit the enclosures 2. The support mechanism 6 and the tie rod assembly 9 are placed between the four enclosure panels 2. The support mechanism 6 is used to support the four enclosure panels 2 to prevent the enclosure panels 2 from bending inward due to water flow impact. When the water flow impacts the enclosure panels 2, the enclosure panels 2 squeeze the support mechanism 6. At that time, the elastic element 13 of the support mechanism 6 will move and pull the second fixed frame 7 downward through the tie rod assembly 9, so that the second fixed frame 7 presses down on the enclosure panels 2, making the enclosure panels 2 more firmly connected to the first fixed frame 5.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A prefabricated cofferdam, characterized in that, include: Enclosure (2); A base (1) is used to install the enclosure (2), there are several enclosures (2), and adjacent enclosures (2) are fitted with a clearance; The second fixing frame (7) is used to reinforce and limit the upper side of several of the enclosure panels (2) so that the enclosure panels (2) cannot move. A support mechanism (6) is provided between several of the enclosure panels (2) to support the enclosure panels (2) and keep the enclosure panels (2) in a vertical state; The support mechanism (6) includes a support frame (11), and the support frame (11) is rectangular. Each of the four sides of the support frame (11) is provided with an elastic element (13), and the surface of the support frame (11) contacts the four surrounding plates (2) respectively. A pull rod assembly (9) is provided between the support mechanism (6) and the second fixed frame (7). The support mechanism (6) includes multiple elastic elements (13). Several elastic elements (13) support several enclosures (2) respectively. When the elastic element (13) is pushed by the enclosure (2), the other end of the elastic element (13) pulls down the second fixed frame (7) through the pull rod assembly (9). The elastic element (13) includes a fixing frame (14), which is mounted on a support frame (11). A sliding rod (15) is slidably mounted on the support frame (11), and a top plate (16) is mounted at the end of the sliding rod (15). Four through holes (12) corresponding to the top plate (16) are opened on the support frame (11). The top plate (16) passes through the through holes (12) and contacts the surrounding plate (2). The pull rod assembly (9) includes four pull rods (20) and four top blocks (18). The pull rods (20) are mounted on the second fixed frame (7). The lower end of the pull rods (20) is fixed with an inclined plate (19), and the four top blocks (18) are in contact with the four inclined plates (19) respectively. The side of the top block (18) that contacts the inclined plate (19) is set as an inclined surface, and the side of the inclined plate (19) that is close to the top block (18) is the lower end of the inclined surface of the inclined plate (19).

2. The prefabricated cofferdam according to claim 1, characterized in that: The base (1) includes a first fixed frame (5), which is rectangular and has a first positioning groove (8) inside. Several of the surrounding plates (2) are inserted into the first positioning groove (8), and anchor rods (4) are vertically arranged on the four sides of the base (1).

3. The prefabricated cofferdam according to claim 2, characterized in that: The surface of the enclosure (2) is provided with several vertical reinforcing cylinders (3), and the anchor rod (4) is inserted into the corresponding reinforcing cylinder (3).

4. The prefabricated cofferdam according to claim 1, characterized in that: The second fixed frame (7) is rectangular, and a second positioning groove (10) is provided inside the second fixed frame (7), and the upper side of multiple side panels (2) is inserted into the second positioning groove (10).

5. The prefabricated cofferdam according to claim 2, characterized in that: The anchor rod (4) is rectangular in shape with a pointed bottom, and the four anchor rods (4) are respectively located in the middle of the four sides of the first fixed frame (5).

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