Rapid cofferdam implementation device for water conservancy construction

Abstract

The utility model discloses a cofferdam device for rapidly implementing water conservancy construction. The cofferdam device solves the problem that an existing box-type steel sheet pile is low in construction speed. The cofferdam device comprises a reinforced concrete prefabricated cofferdam, I-shaped steel piles and steel beams, the reinforced concrete prefabricated cofferdam is composed of an arc-shaped plate part, side stand column parts and a bottom plate part, the arc-shaped plate part has the radian protruding towards the outer side of the cofferdam, the side stand column parts are located on the two sides of the arc-shaped plate part, and the bottom plate part is located below the arc-shaped plate part. A reserved through hole penetrating in the vertical direction is formed in the bottom plate part of the fan-shaped outline, the reserved through hole is fixed to a riverbed by penetrating an I-shaped steel pile, the multiple steel-concrete prefabricated cofferdams are spliced to form an enclosed area, a steel beam is arranged in the enclosed area, and the two ends of the steel beam abut against the inner walls of the side stand column parts of the steel-concrete prefabricated cofferdams respectively. According to the cofferdam, rapid construction is conducted in the mode that the prefabricated cofferdam and the I-shaped steel piles are combined, and the construction speed is higher than that of single-layer steel sheet piles.

Description

Technical Field

[0001] This utility model relates to the technical field of cofferdam construction facilities. Background Technology

[0002] In water conservancy and other engineering projects, steel cofferdams are commonly used. The construction process involves continuously driving U-shaped or Z-shaped steel sheet piles into the riverbed soil near the construction site to form a closed structure. Steel cofferdams are a common temporary water-retaining structure designed to provide a dry construction environment.

[0003] Single-layer sheet piles have poor mechanical properties and are prone to compression deformation under water pressure, thus limiting their application to areas such as swamps or shallow waters. To address this, double-layer sheet piles or box-type sheet piles have emerged, offering better mechanical properties. For example, CN222083593U discloses a cofferdam for water conservancy planning, design, and construction, in which double-layer boxes are connected sequentially to form a rectangular cofferdam, each double-layer box including two side plates and a bottom plate. However, the construction of this type of cofferdam is complex, especially the assembly of the double-layer boxes, which is extremely cumbersome. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rapid cofferdam device for hydraulic construction, which solves the problem of slow construction speed of existing box-type steel sheet piles and improves the overall mechanical performance of the cofferdam through structural optimization.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A rapid-implementation cofferdam device for water conservancy construction includes a precast reinforced concrete cofferdam, I-beam piles, and steel beams. The precast reinforced concrete cofferdam is characterized by comprising an arc-shaped plate, side columns, and a bottom plate. The arc-shaped plate has an arc protruding outwards from the cofferdam. The side columns are located on both sides of the arc-shaped plate, and the bottom plate is located below it. A pre-drilled hole is provided in the fan-shaped bottom plate, penetrating vertically. The pre-drilled hole is fixed to the riverbed by I-beam piles. Multiple precast reinforced concrete cofferdams are spliced ​​together to form an enclosed area. Steel beams are installed within the enclosed area, with both ends of the steel beams abutting against the inner walls of the side columns of the precast reinforced concrete cofferdam.

[0007] Furthermore, the base plate portion and the arc-shaped plate portion are arranged perpendicularly to each other.

[0008] Furthermore, on the outside of the enclosed area cofferdam, a seepage-proof pressure foot is provided at the vertical overlap between the bottom of the precast reinforced concrete cofferdam and the bottom of the riverbed.

[0009] Furthermore, the reserved perforation is formed by pre-embedding an I-shaped sleeve in the base plate.

[0010] Furthermore, the splicing side of the side column is provided with a T-shaped through hole running vertically. After splicing, the two adjacent precast steel-concrete cofferdams have two T-shaped through holes that connect with each other to form an I-shaped interlocking hole. The I-beam steel pile connects the two adjacent precast steel-concrete cofferdams.

[0011] Furthermore, a pre-embedded steel plate is provided on the inner wall of the side column, and bolt holes are provided on the pre-embedded steel plate. High-strength bolts are used to fix the steel beam to the pre-embedded steel plate.

[0012] Furthermore, the bottom of the I-beam pile has an inverted V-shaped notch, and a limiting block is provided at the top of the I-beam pile.

[0013] Furthermore, the joint between the two precast reinforced concrete cofferdams is sealed with sealing strips.

[0014] The beneficial effects of this utility model are:

[0015] The construction speed is fast. This cofferdam adopts a combination of prefabricated cofferdam and I-beam piles for rapid construction, and the construction speed is also faster than that of single-layer steel sheet pile construction.

[0016] The cofferdam has good mechanical properties. Among them, the precast cofferdam is a precast steel-concrete composite component, which has a greater self-weight and a significantly higher compressive strength than the existing single-layer steel sheet piles.

[0017] The technical effects of this utility model will be further explained in conjunction with specific embodiments. Attached Figure Description

[0018] Figure 1 This is a 3D view of a precast reinforced concrete cofferdam.

[0019] Figure 2 for Figure 1 Top view.

[0020] Figure 3 for Figure 2 Another style shows a precast steel-concrete cofferdam at the corner joint.

[0021] Figure 4 This is a 3D view of an I-beam pile.

[0022] Figure 5 This is a perspective view of the present invention, showing the view from the outside of the cofferdam.

[0023] Figure 6 This is a perspective view of the present invention, showing the inner side of the cofferdam.

[0024] Figure 7This is a plan view of the cofferdam device after its implementation.

[0025] Figure 8 This is a 3D view of the steel beam.

[0026] In the picture:

[0027] 10. Precast reinforced concrete cofferdam; 11. Arc-shaped slab section; 12. Side column section; 121. T-shaped perforation; 122. Embedded steel plate; 13. Bottom slab section; 131. Reserved perforation.

[0028] 20 I-beam piles, 21 V-shaped notches, 22 limiting blocks.

[0029] 30 steel beams, 31 flange plates

[0030] 40 anti-seepage pressure foot. Detailed Implementation

[0031] To enable those skilled in the art to better understand this utility model, the following description is provided in conjunction with the appendix. Figure 1 To be continued Figure 8 The technical solution of this utility model is further described below.

[0032] A rapid-implementation cofferdam device for hydraulic construction includes a precast reinforced concrete cofferdam 10, H-beam piles 20, and steel beams 30. In this embodiment, the precast reinforced concrete cofferdam 10 is formed using a special precast concrete mold and, depending on its location, is divided into an arc-shaped plate section 11, side column sections 12, and a base plate section 13. The arc-shaped plate section 11 has an arcuate structure, the side column sections 12 are located on both sides of the arc-shaped plate section, and the base plate section 13 is located below the arc-shaped plate section, with a perpendicular arrangement between the base plate section and the arc-shaped plate section. The base plate section 13 has a fan-shaped outline and is provided with H-beam-shaped pre-reserved through holes 131. These pre-reserved through holes are formed by pre-embedding H-beam-shaped sleeves in the base plate section and are used for the insertion and installation of the H-beam piles.

[0033] Furthermore, a T-shaped perforation 121 is provided at the aforementioned side column 12. The T-shaped perforation 121 is used to connect two adjacent precast steel-concrete cofferdams. Specifically, after the two adjacent precast steel-concrete cofferdams 10 are assembled, the T-shaped perforations are connected to each other to form an I-shaped insertion hole. The two adjacent precast steel-concrete cofferdams are connected by I-beam piles 20 to form a whole.

[0034] Furthermore, a pre-embedded steel plate 122 for installing steel beams is provided in the side column part 12. The pre-embedded steel plate 122 is provided with bolt holes, and the pre-embedded steel plate and the connecting plate at the end of the steel beam can be quickly assembled by high-strength bolts.

[0035] Furthermore, the bottom of the I-beam pile 20 has an inverted V-shaped notch 21, forming a double-pointed structure, which facilitates the rapid insertion of the I-beam pile. A limiting block 22 is set at the top of the I-beam pile 20, which is used to limit the top of the I-beam pile during the pile insertion process.

[0036] The steel beam 30 is an I-beam, and connecting flange plates 31 are provided at both ends of the I-beam. These connecting flange plates are used to mechanically cooperate with the embedded steel plate 122 and are fastened together using high-strength bolts.

[0037] The following explanation will be based on a specific construction process.

[0038] The construction process begins with pre-construction preparations. Based on the hydrogeological data of the area to be constructed, the dimensions, maximum water pressure, and stability (anti-buoyancy, anti-overturning, and anti-seepage) of the cofferdam are calculated. Then, the precast steel-concrete cofferdam 10 is prefabricated in a factory. Each precast cofferdam piece must consider transportation, hoisting, and its own weight. I-beam piles 20 are also prepared. An inverted V-shaped notch is milled into the bottom of each I-beam pile to facilitate its insertion.

[0039] Then, the construction area is measured and laid out, the outline of the cofferdam is demarcated, and the riverbed or lakebed where the outline is located is dredged and leveled, awaiting installation.

[0040] Guide frame installation: A temporary guide frame is installed in the construction water area. This guide frame is used for underwater positioning of the precast reinforced concrete cofferdam 10, ensuring accurate positioning of the precast cofferdam. During the lowering of the precast reinforced concrete cofferdam, the joints of adjacent precast reinforced concrete cofferdams are kept intact. I-beams 20 are inserted from top to bottom through the I-shaped perforation holes formed by assembling two adjacent precast reinforced concrete cofferdams, connecting the two adjacent precast reinforced concrete cofferdams into a single unit. After all the precast reinforced concrete cofferdams are constructed, I-beams 20 are driven one by one into the T-shaped perforations at the bottom slab of the precast cofferdam, forming a reliable connection between the bottom slab and the riverbed through the I-beams.

[0041] Note that during the above construction process, when the transverse and longitudinal precast steel-concrete cofferdams form a 90-degree angle, the following should be used: Figure 2 and Figure 3 The patterns in the diagram are spliced ​​together to meet the piling requirements of the I-beam columns.

[0042] During construction, the aforementioned I-beam piles 20 need to be driven in one by one. Vibratory hammers or static pressure equipment can be used for pile driving, so that the bottom of the I-beam pile is embedded in the riverbed, forming an anchoring structure with the effect of anchoring nails.

[0043] Grease can be applied to the T-shaped perforation for lubrication and seepage prevention. If necessary, the joint between the two prefabricated cofferdams at this location can be sealed with a sealing strip to prevent local water seepage.

[0044] Then, steel beams 30 were used to provide inner support for the opposing precast cofferdams, and high-strength bolts were used for assembly construction, referring to... Figure 7 This support improves the internal mechanical properties of precast reinforced concrete cofferdams and prevents deformation, making it particularly suitable for deep-water cofferdams.

[0045] Then, on the outside of the cofferdam, clay is poured, stones are placed to press down the foot, or underwater concrete is poured to seal the bottom at the vertical overlap between the bottom of the precast wall and the bottom of the riverbed, forming a seepage-proof foot 40 with a thickness of 1.5 to 3 meters. If necessary, geomembrane is used to assist in the seepage-proof construction.

[0046] Finally, pumping and monitoring are carried out inside the cofferdam. High-powered pumping equipment is used to pump out all the water inside the cofferdam, and the leakage inside the cofferdam is monitored in real time. If there is a small amount of leakage, it is normal and water pumps can be used to drain the water.

[0047] If any abnormalities are found, the cofferdam needs to be reinforced in a timely manner.

[0048] To dismantle the cofferdam, after the project is completed, water will be injected into the cofferdam until the water levels inside and outside are the same, so that the water pressure inside and outside the cofferdam is the same. Then, the steel beams will be dismantled layer by layer from bottom to top, and all the I-beams will be pulled out. Finally, the prefabricated cofferdam will be lifted out.

[0049] The structural advantage of this embodiment is that the arc-shaped part of the prefabricated cofferdam is set to face outward. After the water inside the cofferdam is pumped out, the water pressure on the outside is applied to the arc-shaped part, forming an arch structure similar to an arch bridge. The arch-shaped part is under pressure and has better mechanical properties.

[0050] The precast steel-concrete retaining wall in this embodiment has a greater self-weight and higher rigidity, and has better mechanical properties to resist water pressure than traditional steel sheet piles, resulting in a higher safety factor.

[0051] In this embodiment, the I-beam piles do not need to interlock during construction; they can be driven directly as shown in the figure, which is more efficient than traditional interlocking sheet piles.

[0052] This embodiment is applicable to temporary cofferdams in local areas such as rivers and lakes, and can be flexibly adjusted and implemented according to specific engineering conditions to ensure safety and economy.

[0053] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A device for quickly implementing a cofferdam in water conservancy construction, comprising a steel-concrete prefabricated cofferdam, an I-steel pile and a steel beam, characterized in that, The precast reinforced concrete cofferdam consists of an arc-shaped plate, side columns, and a bottom plate. The arc-shaped plate has an arc protruding outward from the cofferdam. The side columns are located on both sides of the arc-shaped plate, and the bottom plate is located below the arc-shaped plate. The bottom plate, with its fan-shaped profile, has pre-drilled holes running vertically through it. These holes are fixed to the riverbed by I-beam piles. Multiple precast reinforced concrete cofferdams are spliced ​​together to form an enclosed area. On the outside of the cofferdam in the enclosed area, at the vertical overlap between the bottom of the precast reinforced concrete cofferdam and the bottom of the riverbed, seepage-proof pressure feet are provided. Steel beams are installed within the enclosed area, with both ends of the steel beams abutting against the inner walls of the side columns of the precast reinforced concrete cofferdam.

2. The rapid cofferdam device for hydraulic construction of claim 1, wherein, The base plate and the arc-shaped plate are arranged perpendicularly to each other.

3. The quick-implementation cofferdam device for water conservancy construction of claim 1, wherein The reserved perforation is formed by pre-embedding an I-shaped sleeve in the base plate.

4. The rapid cofferdam device for hydraulic construction of claim 1, wherein, The splicing side of the side column is provided with a T-shaped through hole running vertically. After splicing, the two T-shaped through holes of two adjacent precast steel-concrete cofferdams are connected to each other to form an I-shaped interlocking hole. The I-beam steel piles connect the two adjacent precast steel-concrete cofferdams.

5. The rapid implementation cofferdam device for water conservancy construction of claim 1, wherein, The inner wall of the side column is provided with a pre-embedded steel plate, and bolt holes are provided on the pre-embedded steel plate. High-strength bolts are used to fix the steel beam to the pre-embedded steel plate.

6. The rapid implementation cofferdam device for water conservancy construction of claim 1, wherein, The bottom of the I-beam has an inverted V-shaped notch, and a limiting block is set at the top of the I-beam.

7. The rapid implementation cofferdam device for water conservancy construction according to claim 1, characterized in that, The joint between the two precast steel-concrete cofferdams was sealed with sealing strips.

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