Pier construction cofferdam structure

Abstract

The application relates to the technical field of cofferdam structures, in particular to a bridge pier construction cofferdam structure which comprises a guide base and a cutting; further comprising a guide assembly which comprises a first guide module and a second guide module, the first guide module comprises fixing seats arranged on both sides of the guide base, and a sliding groove is arranged on the fixing seat, a sliding block is movably arranged in the sliding groove, and a guide frame is fixedly arranged on the sliding block; the guide assembly can smoothly fix the guide base on a riverbed, then a water under motor is started to drive the rotating shaft to rotate, the reel tightens the steel cable, the expanding part expands to the riverbed, the stability of the cutting is improved, the first guide module is fixed on the upper end of the arc-shaped rack before this, when the rotating shaft rotates, the end of the guide wheel is in the same horizontal plane with the inner arc surface of the guide base, the guide wheel positions the outer arc surface of the steel pile, the guide and the anti-deviation are completed by cooperating with the fixed cage, and the steel pile smoothly penetrates into the bedrock layer.

Description

Technical Field

[0001] This invention relates to the field of cofferdam structure technology, specifically a cofferdam structure for bridge pier construction. Background Technology

[0002] During the construction of bridge piers, cofferdams serve as temporary water-retaining structures. Their main function is to create a dry construction environment in the water, facilitating the pouring and construction of the pier foundations.

[0003] Before cofferdam construction, a cone penetrator is first placed on the riverbed surface to probe the depth of the bedrock layer. Then, steel piles are driven into the bedrock layer using a pile driver, forming a ring of piles. Since gaps can easily appear between the piles, leakage can easily occur under water pressure, affecting construction safety and efficiency. Therefore, rubber gaskets or asphalt coatings are used to seal the gaps between the piles. Then, a steel reinforcement cage is used to reinforce the inside of the pile ring to withstand water pressure. Finally, dewatering can be carried out. However, during the pile driving process, the considerable length of the piles can easily cause them to bend, thus affecting their penetration into the bedrock layer and reducing the waterproofing effect. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cofferdam structure for bridge pier construction, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cofferdam structure for bridge pier construction, comprising a guide base and cuttings; It also includes a guide assembly, which includes a first guide module and a second guide module. The first guide module includes fixed seats disposed on both sides of the guide base and a slide groove formed on the fixed seat. A slider is movably installed in the slide groove. A guide frame is fixedly installed on the slider. A guide wheel is installed on the top of the guide frame. A limit groove is formed in the middle of the guide frame. A positioning bolt is threadedly connected to the fixed seat.

[0006] Preferably, the second guide module includes a fixed frame fixedly installed on the surface of the guide base, and drive rails fixedly installed on both sides of the fixed frame. An arc-shaped rack is movably installed in the drive rail, and a fixed plate is fixedly installed on the drive rail. An underwater motor is fixedly installed on the surface of one of the fixed plates. A rotating shaft is fixedly installed on the output shaft of the underwater motor. Gears are fixedly installed on both sides of the outer surface of the rotating shaft, and the arc-shaped rack meshes with the gears.

[0007] Preferably, it also includes an extension component, which includes a reel fixedly mounted on the outer surface of the shaft and a steel cable connected to the reel for transmission. The insert has an installation groove, a hinge is fixedly mounted in the installation groove, an extension member is fixedly mounted at the other end of the hinge, the insert surface has a through groove adapted to the extension member, and the steel cable is fixedly connected to the extension member.

[0008] Preferably, a reinforcing seat is fixedly installed at the bottom of the drive rail, and the bottom of the reinforcing seat is at the same horizontal plane as the bottom of the guide base.

[0009] Preferably, the guide frame has a through hole, and the upper end of the arc-shaped rack is provided with a stud.

[0010] Preferably, a steel pile is provided on the inner side of the guide base, and a reinforcement cage is provided on the other side of the steel pile.

[0011] Preferably, both ends of the top of the guide base are fixedly installed with insert frames, and the insert frames are provided with anti-seepage components.

[0012] Preferably, a mounting plate is provided in the limiting groove, and a set of turbulence wheels is movably mounted on the mounting plate.

[0013] Preferably, the seepage-proof component is V-shaped, and the turbulence wheel assembly is located to the side of the seepage-proof component.

[0014] In the above technical solution, the beneficial effects of the present invention are as follows: the guide component enables the guide base to be smoothly fixed on the riverbed, and then the underwater motor is started to drive the shaft to rotate, so that the reel tightens the steel cable, and the extension component extends into the riverbed, improving the stability of the cutting. Before this, the first guide module is fixed on the upper end of the arc-shaped rack. When the shaft rotates, the end of the guide wheel can be made to be on the same horizontal plane as the inner arc surface of the guide base. The guide wheel will position the outer arc surface of the steel pile, and together with the reinforcement cage, it completes the guidance and anti-deviation, so that the steel pile can be smoothly penetrated into the bedrock layer.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0016] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention; Figure 2 This is a schematic diagram of a partial assembly of the present invention; Figure 3 This is a schematic diagram showing the positional relationship between the guiding component and the expansion component of the present invention; Figure 4 For the present invention Figure 3 A magnified structural diagram of section B in the middle; Figure 5 This is a schematic diagram of the specific structure of the guiding component of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the partial structure at point A in the middle; Figure 7 This is a partial three-dimensional exploded view of the guiding component of the present invention; Figure 8 This is a cross-sectional view of the extended component of the present invention.

[0018] In the diagram: 1. Guide base; 11. Insert; 2. Fixed seat; 21. Slide groove; 22. Slider; 23. Guide frame; 24. Guide wheel; 25. Limiting groove; 26. Positioning bolt; 3. Fixed frame; 31. Drive rail; 32. Arc rack; 33. Fixed plate; 34. Underwater motor; 35. Rotating shaft; 36. Gear; 4. Reel; 41. Steel cable; 42. Mounting groove; 43. Hinge; 44. Extension piece; 5. Reinforcing seat; 6. Through hole; 61. Stud; 7. Steel pile; 71. Reinforcing cage; 8. Insert frame; 81. Seepage prevention piece; 9. Mounting plate; 91. Turbine wheel assembly. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: Please refer to Figures 1 to 8 The present invention provides a technical solution: a cofferdam structure for bridge pier construction, comprising a guide base 1 and a cutting 11; It also includes a guide assembly, which includes a first guide module and a second guide module. The first guide module includes a fixed seat 2 disposed on both sides of the guide base 1, and a slide groove 21 opened on the fixed seat 2. A slider 22 is movably installed in the slide groove 21. A guide frame 23 is fixedly installed on the slider 22. A guide wheel 24 is installed on the top of the guide frame 23. A limit groove 25 is opened in the middle of the guide frame 23. A positioning bolt 26 is threadedly connected to the fixed seat 2.

[0021] The second guide module includes a fixed frame 3 fixedly installed on the surface of the guide base 1, and drive rails 31 fixedly installed on both sides of the fixed frame 3. An arc-shaped rack 32 is movably installed in the drive rail 31. A fixed plate 33 is fixedly installed on the drive rail 31. An underwater motor 34 is fixedly installed on the surface of one of the fixed plates 33. A rotating shaft 35 is fixedly installed on the output shaft of the underwater motor 34. Gears 36 are fixedly installed on both sides of the outer surface of the rotating shaft 35, and the arc-shaped rack 32 and the gears 36 mesh with each other.

[0022] A reinforcing seat 5 is fixedly installed at the bottom of the drive rail 31, and the bottom of the reinforcing seat 5 is at the same level as the bottom of the guide base 1.

[0023] Specifically, when the pile driver hammers the steel pile into the bedrock layer, the steel pile is quite long, so it is easy for the steel pile to bend during the hammering process, which makes it difficult for it to penetrate into the bedrock layer smoothly and reduces the waterproofing effect. In this invention, before hammering the steel pile, the guide base 1 is positioned first. The guide base 1 guides the steel pile 7 to prevent deviation. During operation, the fixed seat 2 needs to be fixed at the bottom of the riverbed first. Then, the guide frame 23 is installed on the top of the fixed seat 2 through the sliding groove 21 and the slider 22. The surfaces of the slider 22 and the fixed seat 2 are provided with screw holes. Then, the positioning bolt 26 is tightened to lock the guide frame 23 and the fixed seat 2, and the guide wheel 24 limits the longitudinal movement of the guide base 1. The fixed seat 2 can be made of heavy metal. When placing it, the riverbed is compacted and a pit is dug for fixation to improve its stability. Next, the underwater motor 34 is started to drive the rotating shaft 35 to rotate, which in turn drives the gear 36 to rotate. The gear 36 drives the arc rack 32, so that the bottom end of the arc rack 32 extends into the limiting groove 25. In this way, since the fixed frame 3 fixes the drive rail 31 and the guide base 1, the limiting groove 25 can limit the guide base 1 laterally. Then, the guide base 1 is driven to the bottom of the riverbed by a pile driver. The guide base 1 will move vertically downward along the guide frame 23 until the connection between the guide base 1 and the cutting 11 is close to the lower side of the guide frame 23. Half of the cutting 11 will be inserted into the riverbed, completing the initial fixation of the guide base 1. Then, the underwater motor 34 is started again to move the arc-shaped rack 32 out of the limiting groove 25, releasing the lateral limitation of the guide base 1. Then, the positioning bolt 26 is loosened and the fixing seat 2 is removed. After the fixing seat 2 is removed, there is space under the guide frame 23. At this time, the guide frame 23 is slid down so that the top of the guide wheel 24 is lower than the connection between the guide base 1 and the cutting 11. Then the guide frame 23 is removed, thus releasing the longitudinal limitation of the guide base 1. Since half of the cutting 11 has already penetrated into the riverbed and has achieved initial stability, the guide base 1 is then driven again with a pile driver to completely bury the cutting 11 into the riverbed and complete its fixation. At the same time, the reinforcing base 5 will also come into contact with the riverbed, improving the overall stability of the guide base 1. Then, following the above method, other guide bases 1 are fixed along the cofferdam area.

[0024] Example 2: Please refer to Figures 2 to 4 It also includes an extension component, which includes a reel 4 fixedly mounted on the outer surface of the rotating shaft 35, and a steel cable 41 connected to the reel 4 for transmission. The insert 11 has an installation groove 42, and a hinge 43 is fixedly mounted in the installation groove 42. An extension member 44 is fixedly mounted at the other end of the hinge 43. The surface of the insert 11 has a through groove adapted to the extension member 44. The steel cable 41 is fixedly connected to the extension member 44.

[0025] The guide frame 23 has a through hole 6, and the upper end of the arc-shaped rack 32 is provided with a stud 61.

[0026] A steel pile 7 is installed on the inner side of the guide base 1, and a reinforcement cage 71 is installed on the other side of the steel pile 7.

[0027] Based on Example 1, after several guide bases 1 are fixed, the guide frame 23 is installed on the upper end of the arc-shaped rack 32. The guide frame 23 has an insertion hole that matches the arc-shaped rack 32. The upper end of the arc-shaped rack 32 has a round hole that matches the stud 61. After the guide frame 23 is installed on the arc-shaped rack 32, the stud 61 is inserted into the through hole 6 and passes through the round hole. Then, nuts are screwed into both ends of the stud 61 to complete the fixing of the arc-shaped rack 32 and the guide frame 23. Next, the underwater motor 34 is started to drive the rotating shaft 35 to rotate, which in turn drives the reel 4 to rotate, causing the reel 4 to tighten the steel cable 41. When the steel cable 41 is tightened, it will pull the extension piece 44. With the help of the hinge 43, the extension piece 44 can be extended towards the riverbed, thereby improving the stability of the cutting 11. On the other hand, when the rotating shaft 35 rotates, it also drives the gear 36 to rotate, causing the gear 36 to drive the arc-shaped rack 32, which in turn moves the arc-shaped rack 32 upward, thereby moving the guide frame 23. This ensures that the end of the guide wheel 24 is on the same horizontal plane as the inner arc surface of the guide base 1. Thus, when installing the steel pile 7, the guide wheel 24 positions the outer arc surface of the steel pile 7. Since the steel pile 7 has a considerable length, under the guidance of the guide base 1 and supported by the arc-shaped rack 32, the guide frame 23 can perform limiting and guiding operations at a higher position on the steel pile 7, preventing the steel pile 7 from bending outward when hammered, as per the instruction manual. Figure 1 Included with instruction manual Figure 3 As shown; Next, the steel pile 7 is laid out along the inner arc surface of the guide base 1. After the laying is completed, the reinforcement cage 71 is placed into the steel pile 7 along the inner arc surface by a crane. The reinforcement cage 71 can prevent the steel pile 7 from bending inward when it is hammered, thus ensuring that the steel pile 7 penetrates into the bedrock layer in a vertical state.

[0028] Example 3: Please refer to Figure 1 and Figure 2 Both ends of the top of the guide base 1 are fixedly installed with insert frames 8, and anti-seepage components 81 are provided inside the insert frames 8.

[0029] A mounting plate 9 is provided inside the limiting groove 25, and a spoiler wheel assembly 91 is movably mounted on the mounting plate 9.

[0030] The seepage prevention component 81 is V-shaped, and the turbulence wheel assembly 91 is located to the side of the seepage prevention component 81.

[0031] Based on Example 2, after several steel piles 7 have been completed and enclosed, it is necessary to insert the anti-seepage component 81 into the insertion frame 8 and fasten it with screws on the top of the anti-seepage component 81. The anti-seepage component 81 is located at the connection between the steel piles 7 and the steel piles 7. Under the action of water pressure, water seepage is likely to occur here. It can be sealed by rubber gaskets and asphalt coating. Mud and sand are poured into the groove formed between the anti-seepage component 81 and the steel piles 7 and compacted to further prevent leakage. Furthermore, after the seepage prevention component 81 is installed, the mounting plate 9 can be inserted into the limiting groove 25 and fixed with screws. When the water flow impacts the seepage prevention component 81, since the seepage prevention component 81 is V-shaped, it can achieve the purpose of water diversion and guidance, guiding the water flow to the side of the seepage prevention component 81, reducing the seepage pressure of the gap between the steel piles 7. The water flow guided to the side of the seepage prevention component 81 will further reduce the pressure on the steel piles 7 under the turbulence of the turbulence wheel group 91. With the support of the reinforcement cage 71 on the inner side of the steel piles 7, the strength of the cofferdam can be improved.

[0032] In summary, during construction, first, the fixed base 2 is fixed at the bottom of the riverbed. Then, the guide frame 23 is installed on top of the fixed base 2 using the sliding groove 21 and the slider 22. Next, the positioning bolts 26 are tightened to lock the guide frame 23 and the fixed base 2, and the guide wheel 24 limits the longitudinal movement of the guide base 1. Then, the underwater motor 34 is started to drive the rotating shaft 35 to rotate, which in turn drives the gear 36 to rotate. The gear 36 drives the arc-shaped rack 32, causing the bottom end of the arc-shaped rack 32 to extend into the limiting groove 25, thus limiting the lateral movement of the guide base 1. Finally, the guide base 1 is driven by a pile driver. When the cutting 11 is halfway into the riverbed, the underwater motor 34 is restarted to move the arc-shaped rack 32 out of the limiting groove 25, releasing the lateral limitation of the guide base 1. Then, the positioning bolt 26 is loosened and the fixing seat 2 is removed. Next, the guide frame 23 is removed to release the longitudinal limitation of the guide base 1. Then, the guide base 1 is hammered again with a pile driver to completely bury the cutting 11 in the riverbed and complete the fixation. Then, the other guide bases 1 are fixed along the cofferdam area in the same way. After several guide bases 1 are fixed, the guide frame 23 is installed onto the arc-shaped rack. At the upper end of 32, the underwater motor 34 is then started to drive the rotating shaft 35 to rotate, which in turn drives the reel 4 to rotate, causing the reel 4 to tighten the steel cable 41. When the steel cable 41 is tightened, it will pull the extension member 44. With the help of the hinge 43, the extension member 44 can be extended towards the riverbed. At the same time, the rotation of 35 will drive the gear 36 to rotate, which will drive the arc-shaped rack 32, thereby moving the guide frame 23. This will make the end of the guide wheel 24 and the inner arc surface of the guide base 1 level, positioning the outer arc surface of the steel pile 7. Then, the steel pile 7 is laid along the inner arc surface of the guide base 1, completing the process. After the cofferdam is set up, the reinforcing cage 71 is lowered into the inner arc surface of the steel piles 7 by a crane. After several steel piles 7 have completed the enclosure, the seepage prevention component 81 needs to be inserted into the insertion frame 8 and secured with screws on the top of the seepage prevention component 81. Mud and sand are poured into the groove formed between the seepage prevention component 81 and the steel piles 7 and compacted. When the water flow impacts the seepage prevention component 81, the water flow can be guided to the side of the seepage prevention component 81. The water flow guided to the side of the seepage prevention component 81 will reduce the pressure on the steel piles 7 under the turbulence of the turbulence wheel group 91. With the support of the reinforcing cage 71 on the inner side of the steel piles 7, the strength of the cofferdam can be improved.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cofferdam structure for bridge pier construction, comprising a guide base (1) and a cutting (11), characterized in that: It also includes a guide assembly, which includes a first guide module and a second guide module. The first guide module includes a fixed seat (2) disposed on both sides of the guide base (1) and a slide groove (21) opened on the fixed seat (2). A slider (22) is movably installed in the slide groove (21). A guide frame (23) is fixedly installed on the slider (22). A guide wheel (24) is installed on the top of the guide frame (23). A limit groove (25) is opened in the middle of the guide frame (23). A positioning bolt (26) is threadedly connected to the fixed seat (2).

2. The cofferdam structure for bridge pier construction according to claim 1, characterized in that: The second guide module includes a fixed frame (3) fixedly installed on the surface of the guide base (1) and a drive rail (31) fixedly installed on both sides of the fixed frame (3). An arc-shaped rack (32) is movably installed in the drive rail (31). A fixed plate (33) is fixedly installed on the drive rail (31). An underwater motor (34) is fixedly installed on the surface of one of the fixed plates (33). A rotating shaft (35) is fixedly installed on the output shaft of the underwater motor (34). Gears (36) are fixedly installed on both sides of the outer surface of the rotating shaft (35), and the arc-shaped rack (32) and the gears (36) mesh with each other.

3. The cofferdam structure for bridge pier construction according to claim 2, characterized in that: It also includes an extension component, which includes a reel (4) fixedly mounted on the outer surface of the rotating shaft (35) and a steel cable (41) connected to the reel (4) for transmission. The insert (11) has an installation groove (42) in which a hinge (43) is fixedly mounted. An extension member (44) is fixedly mounted at the other end of the hinge (43). The surface of the insert (11) has a through groove adapted to the extension member (44). The steel cable (41) is fixedly connected to the extension member (44).

4. The cofferdam structure for bridge pier construction according to claim 2, characterized in that: A reinforcing seat (5) is fixedly installed at the bottom of the drive rail (31), and the bottom of the reinforcing seat (5) is at the same level as the bottom of the guide base (1).

5. A cofferdam structure for bridge pier construction according to claim 2, characterized in that: The guide frame (23) has a through hole (6), and the upper end of the arc-shaped rack (32) is provided with a stud (61).

6. The cofferdam structure for bridge pier construction according to claim 1, characterized in that: A steel pile (7) is provided on the inner side of the guide base (1), and a reinforcement cage (71) is provided on the other side of the steel pile (7).

7. A cofferdam structure for bridge pier construction according to claim 1, characterized in that: Both ends of the top of the guide base (1) are fixedly installed with insert frames (8), and the insert frames (8) are provided with anti-seepage components (81).

8. A cofferdam structure for bridge pier construction according to claim 7, characterized in that: An installation plate (9) is provided in the limiting groove (25), and a turbulence wheel assembly (91) is movably installed on the installation plate (9).

9. A cofferdam structure for bridge pier construction according to claim 8, characterized in that: The seepage-proof component (81) is V-shaped, and the turbulence wheel assembly (91) is located on the side of the seepage-proof component (81).

Images