Cofferdam structure for pier construction

Abstract

The utility model provides a cofferdam structure for bridge pier construction, which is used for forming an annular cofferdam on a riverbed to facilitate bridge pier construction and comprises a plurality of pile rods which are arranged in an annular array. The inner corbel is vertically arranged on the pile rod, and first sliding grooves are vertically formed in the left side and the right side of the inner corbel correspondingly; the inner brackets are vertically arranged on the pile rod, the inner arc-shaped inserting plates are vertically inserted into the first sliding grooves between the adjacent inner brackets, the multiple inner arc-shaped inserting plates form a cylinder, the outer brackets are vertically arranged on the pile rod, the outer brackets and the inner brackets are symmetrically arranged relative to the pile rod, and second sliding grooves are vertically formed in the left side and the right side of each outer bracket; outer arc-shaped inserting plates are vertically inserted into the second sliding grooves between the adjacent outer brackets, and a cylinder is formed by the multiple outer arc-shaped inserting plates; a sealing material is filled between the outer arc-shaped inserting plate and the inner arc-shaped inserting plate; the problems that a large amount of manpower, material resources and time need to be consumed during installation and disassembly of a traditional cofferdam structure are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cofferdams, and in particular to a cofferdam structure for bridge pier construction. Background Art

[0002] In the construction of bridge foundations, when the bridge piers and platform foundations are located below the surface water level, various forms of earth weirs are built according to local materials; in rivers with deeper water and faster flow rates, wooden piles or steel sheet piles (single or double layers) cofferdams can be used, as well as double-layer thin-walled steel cofferdams. The cofferdam can not only prevent water and confine water, but also support the pit wall of the foundation pit.

[0003] When setting up a cofferdam, it is necessary to set up a corresponding cofferdam type according to the situation of the required cofferdam location. When building a cofferdam in a river with deeper water flow, it is usually necessary to build a temporary maintenance structure in the form of a locking steel pipe pile cofferdam or a double-walled steel cofferdam. Due to the greater water pressure on the outside of the cofferdam at a deeper water flow, the locking steel pipe pile double-arm steel cofferdam used requires a larger size and a complex combination structure to form a good support and maintenance. When setting up, not only a large number of cofferdam structures are required, but also larger lifting equipment and equipment are required to support it. Due to the high structural strength, many parts need to be set up, and thus a lot of manpower, material resources and time are required during installation and disassembly. Utility Model Content

[0004] The utility model aims to provide a cofferdam structure for bridge pier construction, which solves the problem that a large amount of manpower, material resources and time are required for installation and disassembly of the traditional cofferdam structure.

[0005] The embodiment of the utility model is realized by the following technical scheme: a cofferdam structure for bridge pier construction, used to form a circular cofferdam on the riverbed, which is convenient for the construction of bridge piers, including a plurality of piles, the plurality of piles are arranged in a circular array, the lower ends of the piles are placed in the riverbed, and the lower ends of the piles are provided with pads;

[0006] An inner corbel, the inner corbel is vertically arranged on the pile rod, and first sliding grooves are vertically arranged on both left and right sides of the inner corbel;

[0007] An inner arc-shaped insert plate is vertically inserted into the first slide groove between adjacent inner bull legs, and a plurality of the inner arc-shaped insert plates form a cylindrical shape.

[0008] Furthermore, it also includes an outer corbel and an outer arc-shaped plug plate, wherein the outer corbel is vertically arranged on the pile rod, the outer corbel and the inner corbel are symmetrically arranged about the pile rod, and the left and right sides of the outer corbel are vertically arranged with a second slide groove;

[0009] The outer arc-shaped inserting plates are vertically inserted into the second sliding grooves between adjacent outer brackets, and a plurality of the outer arc-shaped inserting plates form a cylindrical shape.

[0010] Furthermore, a sealing material is filled between the outer arc-shaped plug plate and the inner arc-shaped plug plate.

[0011] Furthermore, the lower ends of the outer arc-shaped plug plate and the inner arc-shaped plug plate are both tapered.

[0012] Furthermore, the pile rod is a steel pipe pile; and the cushion block is a concrete block.

[0013] Furthermore, it also includes a plurality of inner peripheral purlins, which are vertically spaced apart and arranged inside the plurality of pile rods, and the inner peripheral purlins are connected to the plurality of inner corbels.

[0014] Furthermore, it also includes a plurality of peripheral purlins, which are vertically spaced outside the plurality of pile rods, and the peripheral purlins are connected to the plurality of outer corbels.

[0015] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0016] To form the cofferdam of the support system, it is only necessary to install the steel pipe piles, outer purlins and inner purlins, and then insert the outer arc plug plates and the inner arc plug plates at the corresponding positions to form a ring-shaped support system. At the same time, gravel and other filling materials can be filled between the corresponding outer arc plug plates and the inner arc plug plates. After the internal accumulated water is drained, a stable cylindrical support system is formed under the pressure of the external water. When it needs to be dismantled, it is only necessary to wait until the internal water pressure is consistent with the external water pressure, first pull out the outer arc plug plates and the inner arc plug plates, then remove the inner purlins and the outer purlins, and finally lift the steel pipe piles. The installation and disassembly are very simple, and the parts used are not many. In addition, the weight and volume are much smaller than those of traditional devices. Especially when installing steel pipe piles, the number of installations is much less than that of traditional steel pipe piles, saving a lot of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a top view of a cofferdam structure for bridge pier construction provided by the utility model;

[0019] Figure 2 for Figure 1A magnified schematic diagram of the structure at center A;

[0020] Figure 3 for Figure 1 The C-direction view of the section at B;

[0021] Figure 4 A schematic diagram of the structure of an inner arc-shaped insert plate in a cofferdam structure for pier construction provided by the utility model;

[0022] Figure 5 A schematic diagram of the structure of an outer arc-shaped insert plate in a cofferdam structure for pier construction provided by the utility model;

[0023] Icons: 1. Riverbed, 2. Pile, 21. Pad, 3. Inner corbel, 31. First slide, 4. Inner arc plug plate, 5. Outer corbel, 51. Second slide, 6. Outer arc plug plate, 7. Sealing material, 8. Inner purlin, 9. Outer purlin. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figures 1 to 5 As shown, this embodiment provides a cofferdam structure for bridge pier construction, which is used to form a circular cofferdam on a riverbed 1 to facilitate the construction of bridge piers, and includes a plurality of pile rods 2, the plurality of pile rods 2 are arranged in a circular array, the lower ends of the pile rods 2 are placed in the riverbed 1, and the lower ends of the pile rods 2 are provided with cushion blocks 21;

[0027] In specific implementation, the pile rod 2 is a steel pipe pile; the pad 21 is a concrete block. When burying the steel pipe pile, first drill a hole on the riverbed at the burying position, then place the steel pipe pile in the hole, and continue to turn downward from the inside of the steel pipe pile, while drilling and extracting the mud generated during drilling, until the lower end of the steel pipe pile is buried in the riverbed to a predetermined depth, and then use the expansion drill bit to extend the lower end of the steel pipe pile to expand the hole and drill, after extracting the mud and waste water, pour concrete, the concrete needs to be filled to a certain height inside the steel pipe pile, and then form a good support foundation for the steel pipe pile, until all the steel pipe piles are set.

[0028] More specifically, it also includes an inner corbel 3 and an inner arc-shaped insert plate 4, as well as an outer corbel 5 and an outer arc-shaped insert plate 6. The inner corbel 3 is vertically arranged on the pile rod 2, and the outer corbel 5 is vertically arranged on the pile rod 2. The outer corbel 5 and the inner corbel 3 are symmetrically arranged about the pile rod 2.

[0029] like Figure 1 and 2 As shown, it also includes a plurality of inner purlins 8 and outer purlins 9. The plurality of inner purlins 8 are vertically spaced inside the plurality of piles 2, and the inner purlins 8 are connected to the plurality of inner corbels 3; the plurality of outer purlins 9 are vertically spaced outside the plurality of piles 2, and the outer purlins 9 are connected to the plurality of outer corbels 5.

[0030] In specific implementation, after several steel pipe piles are set up, multiple inner purlins 8 are installed at intervals on the inner corbels 3 on the several steel pipe piles. At the same time, multiple outer purlins 9 need to be installed at intervals on the outer corbels 5 of the several steel pipe piles, usually by bolt connection or welding. At the same time, the outer purlins 9 correspond to the inner purlins 8 one by one, or are alternately arranged. The pile bodies of the several steel pipe piles are mainly limited and fixed by the several inner purlins 8 and the several outer purlins 9 to form a stable circular foundation.

[0031] More specifically, Figure 1-5 As shown, first slide grooves 31 are vertically arranged on both sides of the inner corbels 3; inner arc-shaped inserting plates 4 are vertically inserted into the first slide grooves 31 between adjacent inner corbels 3, and a plurality of inner arc-shaped inserting plates 4 form a cylinder.

[0032] Meanwhile, second slide grooves 51 are vertically arranged on both sides of the outer corbels 5 ; outer arc-shaped insert plates 6 are vertically inserted into the second slide grooves 51 between adjacent outer corbels 5 , and a plurality of outer arc-shaped insert plates 6 form a cylindrical shape.

[0033] In specific implementation, the lower ends of the outer arc plug plate 6 and the inner arc plug plate 4 are both tapered, so that they can be inserted into the riverbed when lowered to block water leakage; when the steel pipe piles and the inner purlin 8 and the outer purlin 9 are installed in place, the inner arc plug plate 4 is inserted from the top between the several inner corbels 3. The inner arc plug plate 4 is mainly an arc-shaped steel plate. Several inner arc plug plates 4 form a circle. After the accumulated water inside the cofferdam is drained, a cylindrical cofferdam support can be formed. In some shallow waters or places with low external pressure, only this structure can be used.

[0034] When encountering deep water or high external pressure, it is necessary to insert an outer arc plug plate 6 from the top between several outer brackets 5. The outer arc plug plate 6 is mainly an arc-shaped steel plate. Several outer arc plug plates 6 form a circle and are coaxially arranged outside several inner arc plug plates 4 forming a ring to form a good support surface. After the internal water is subsequently drained, the cylindrical support structure can form a good support system.

[0035] like Figure 1 and 2 As shown, if necessary, a sealing material 7 can be filled between the outer arc-shaped plug plate 6 and the inner arc-shaped plug plate 4. The sealing material is usually river sand and gravel, etc., which are filled between the outer arc-shaped plug plate 6 and the inner arc-shaped plug plate 4 to isolate the leakage of external water and enhance the stability of the overall structure. If you want to form a permanent or long-term cofferdam, you can fill it with steel frames and concrete fillers.

[0036] In summary, to form a cofferdam of the support system, it is only necessary to install the steel pipe piles, the outer purlin 9 and the inner purlin 8, and then insert the outer arc plug plate 6 and the inner arc plug plate 4 at the corresponding positions to form a ring-shaped support system. At the same time, gravel and other fillers can be filled between the corresponding outer arc plug plate 6 and the inner arc plug plate 4. After the internal accumulated water is drained, a stable cylindrical support system is formed under the pressure of the external water. When it needs to be dismantled, it is only necessary to wait until the internal water pressure is consistent with the external water pressure, and then first pull out the outer arc plug plate 6. shaped plug plate 6 and the inner arc plug plate 4, then remove the inner purlin 8 and the outer purlin 9, and finally lift the steel pipe pile. If the lower end of the steel pipe pile is connected to the concrete block, dig up some riverbeds, pull them out together, and break them on the ground; installation and disassembly are very simple, and the parts used are not many, and its weight and volume are much smaller than those of traditional devices, especially when installing steel pipe piles, the number of installations is much less than that of traditional steel pipe piles, saving a lot of manpower and material resources.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cofferdam structure for bridge pier construction, used to form an annular cofferdam on a riverbed (1) to facilitate the construction of bridge piers, characterized in that: It comprises a plurality of pile rods (2), wherein the plurality of pile rods (2) are arranged in a circular array, the lower ends of the pile rods (2) are placed in the riverbed (1), and the lower ends of the pile rods (2) are provided with cushion blocks (21); An inner corbel (3), the inner corbel (3) being vertically arranged on the pile rod (2), and first sliding grooves (31) being vertically arranged on both left and right sides of the inner corbel (3); An inner arc-shaped inserting plate (4) is vertically inserted into the first sliding groove (31) between adjacent inner brackets (3), and a plurality of the inner arc-shaped inserting plates (4) form a cylindrical shape.

2. A cofferdam structure for bridge pier construction according to claim 1, characterized in that: It also comprises an outer corbel (5) and an outer arc-shaped plug plate (6), wherein the outer corbel (5) is vertically arranged on the pile rod (2), the outer corbel (5) and the inner corbel (3) are symmetrically arranged with respect to the pile rod (2), and second slide grooves (51) are vertically arranged on both left and right sides of the outer corbel (5); The outer arc-shaped inserting plates (6) are vertically inserted into the second sliding grooves (51) between the adjacent outer brackets (5), and a plurality of the outer arc-shaped inserting plates (6) form a cylindrical shape.

3. A cofferdam structure for bridge pier construction according to claim 2, characterized in that: A sealing material (7) is filled between the outer arc-shaped insert plate (6) and the inner arc-shaped insert plate (4).

4. A cofferdam structure for bridge pier construction according to claim 2, characterized in that: The lower ends of the outer arc-shaped plug plate (6) and the inner arc-shaped plug plate (4) are both tapered.

5. A cofferdam structure for bridge pier construction according to any one of claims 2 to 4, characterized in that: The pile rod (2) is a steel pipe pile; and the cushion block (21) is a concrete block.

6. A cofferdam structure for bridge pier construction according to claim 5, characterized in that: It also comprises a plurality of inner peripheral purlins (8), wherein the plurality of inner peripheral purlins (8) are vertically spaced apart and arranged inside the plurality of pile rods (2), and the inner peripheral purlins (8) are connected to the plurality of inner corbels (3).

7. A cofferdam structure for bridge pier construction according to claim 6, characterized in that: It also comprises a plurality of peripheral purlins (9), wherein the plurality of peripheral purlins (9) are arranged vertically at intervals outside the plurality of pile rods (2), and the peripheral purlins (9) are connected to the plurality of external corbels (5).

Images