Cofferdam supporting structure

Abstract

The utility model discloses a cofferdam supporting structure which is characterized in that a surrounding purlin in the cofferdam supporting structure supports the adjacent edge of the surrounding purlin through a net frame type first supporting part and supports the opposite edge of the surrounding purlin through a net frame type second supporting part; according to the net frame type structure of the first supporting part and the second supporting part, bearing platform reinforcing steel bars can penetrate through the net frame type structure, so that the bearing platform reinforcing steel bars do not need to be cut off and can be bound in place at a time, and in addition, due to the net frame type structure, when cushion layer pouring is carried out subsequently, the bearing platform reinforcing steel bars can be conveniently poured. The gaps between the first supporting part and the second supporting part can be filled with the concrete, the stability of the whole structure is not affected, dismantling is not needed in the later period, the construction process can be reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of bridge construction, and more particularly to a cofferdam support structure. Background Art

[0002] At present, during the bridge construction process, due to the fact that large bridge foundations are buried deep in the ground, the foundation pit needs to be supported. The current conventional support methods include installing steel sheet pile support and locking steel pipe pile support on the four side walls of the foundation pit. For deeper foundation pits, a combination of steel sheet pile support and surrounding purlins or locking steel pipe piles and surrounding purlins will be used.

[0003] However, during the construction process, these support structures will affect the binding of the vertical pedestal reinforcement, causing the integrity of the permanent structure to deteriorate and posing a safety hazard. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the relevant technology, it is desired to provide a cofferdam support structure that ensures the integrity of the structure and the convenience of construction and improves the safety of the structure without affecting the binding of the base reinforcement.

[0005] In a first aspect, a cofferdam support structure is provided, comprising:

[0006] The perimeter purlin is a shape formed by steel sections to match the foundation pit;

[0007] A first supporting part and a second supporting part, wherein the first supporting part and the second supporting part are both grid structures;

[0008] The two ends of the first supporting portion are respectively connected to the two adjacent sides of the surrounding purlin;

[0009] Two ends of the second supporting portion are respectively connected to two opposite sides of the surrounding purlin.

[0010] The present application provides a cofferdam support structure, in which the purlins in the cofferdam support structure are supported by a first grid-type support part for adjacent sides of the purlins, and by a second grid-type support part for opposite sides of the purlins. The grid-type structure of the first support part and the second support part enables the base reinforcement to pass therethrough, so there is no need to perform treatment such as cutting the base reinforcement, and the base reinforcement can be tied in place at one time. In addition, the grid-type structure makes it easy for concrete to fill the gaps between the first support part and the second support part during the subsequent pouring of the cushion layer, without affecting the stability of the overall structure and without having to be dismantled at a later stage, thereby reducing the construction process and improving the construction efficiency.

[0011] In one embodiment, two ends of the first support portion are respectively connected to two sides adjacent to the purlin through a first reinforcement structure;

[0012] Two ends of the second supporting portion are respectively connected to two opposite sides of the surrounding purlin through a second reinforcing structure.

[0013] In one embodiment, it further includes:

[0014] A vertical support frame arranged corresponding to the second support portion;

[0015] The vertical support frame extends from the bottom of the foundation pit to the second support portion and is connected to the second support portion. The vertical support frame is a grid structure.

[0016] In one embodiment, the vertical support frame includes at least one pair, and further includes:

[0017] The transverse support beam comprises a first end and a second end, wherein the first end is connected to one of the at least one pair of vertical support frames, and the second end is connected to the other of the at least one pair of vertical support frames.

[0018] In one embodiment, first connecting parts are provided at both ends of the first supporting part, and the first connecting parts are connected to the first reinforcing structure; second connecting parts are provided at both ends of the second supporting part, and the second connecting parts are connected to the first reinforcing structure.

[0019] In one embodiment, the steel sections are double-jointed to form the purlin.

[0020] In one embodiment, the grid structure is a hollow structure in which a plurality of steel sections are connected end to end.

[0021] In one embodiment, it further comprises an external supporting structure, the shape of which matches the shape of the foundation pit, and the surrounding purlin is arranged on the inner wall of the external supporting structure.

[0022] In one embodiment, the external support structure includes a plurality of locking steel pipe piles, and the plurality of locking steel pipe piles are arranged adjacent to and perpendicular to the bottom of the foundation pit.

[0023] In one embodiment, a plurality of support point reinforcement structures are vertically arranged on the inner wall of the external support structure, and the surrounding purlin is erected on the plurality of support point reinforcement structures.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 A structural schematic diagram of a support structure according to an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of another supporting structure according to an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of a purlin provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of another supporting structure provided in an embodiment of the present application;

[0030] Figure 5 A structural schematic diagram of another support structure provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the structure of another first support portion and a second support portion provided in an embodiment of the present application;

[0032] Figure 7 A schematic diagram of the structure of a sub-support portion provided in an embodiment of the present application;

[0033] Figure 8 A schematic diagram of the structure of another sub-support portion provided in an embodiment of the present application;

[0034] Fig. 9 A schematic structural diagram of a first reinforcement structure and a second reinforcement structure provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 11. Foundation pit; 22. External support structure; 221. Lock;

[0037] 33. Enclosure purlin; 331. Support point reinforcement structure;

[0038] 44. first supporting portion; 441. first reinforcing structure;

[0039] 55. second supporting portion; 551. second reinforcing structure;

[0040] 66. Vertical support frame; 77. Horizontal support beam. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0043] Before introducing the cofferdam support structure of this application, the part of the bridge construction process related to this application is introduced:

[0044] Use excavators, bulldozers, etc. to carry out earth excavation in layers and sections from top to bottom according to the pre-set excavation line, and set drainage ditches layer by layer;

[0045] When the first foundation pit 11 is excavated successfully, the steel pipe piles, i.e. the external support structure 22, are installed first;

[0046] A plurality of support point reinforcement structures 331 are vertically arranged on the inner side wall of the external support structure 22;

[0047] The purlin 33 is erected on the supporting point reinforcement structure 331;

[0048] A grid-type first support portion 44 and a second support portion 55 are provided for the surrounding purlin 33, and a vertical support frame 66 and a transverse support beam 77 are provided for the second support portion 55;

[0049] Excavate the second layer of foundation pit 11, and after the excavation is successful, install the surrounding purlin 33, the first support part 44, the second support part 55, the vertical support frame 66 and the transverse support beam 77 in the above manner, and repeat the above steps until the foundation pit 11 is excavated to the specified position, and all the surrounding purlins 33, the first support part 44, the second support part 55, the vertical support frame 66 and the transverse support beam 77 are installed.

[0050] The following is an introduction to the cofferdam support structure provided in this application according to the above installation sequence:

[0051] First, an external support structure 22 is installed for the foundation pit 11. The external support structure 22 is used to provide direct support for the foundation pit 11. Therefore, the external support structure 22 is arranged close to the inner wall of the foundation pit 11. In order to further improve the support effect of the foundation pit 11, for example, Figure 1 As shown, the external support structure 22 may include multiple locking steel pipe piles 221, and the multiple locking steel pipe piles 221 may be arranged closely together. It should be noted here that since the foundation pit 11 is excavated from top to bottom, the shape of the foundation pit 11 may be square, rectangular, hexagonal, etc., and the external support structure 22 is used to support each side of the foundation pit 11, so the multiple locking steel pipe piles 221 are installed from the bottom of the foundation pit 11 and extend to the top of the foundation pit 11, so that the shape of the external support structure 22 installed in this way matches the shape of the foundation pit 11.

[0052] Combine the following Figure 1The structure of a single locking steel pipe pile is exemplified. The locking steel pipe pile is a cylindrical structure, which can be a hollow structure or a solid structure. Optionally, the locking steel pipe pile provided in the present application is a solid structure. The locking steel pipe pile with a solid structure can provide a stronger supporting force, so as to provide better support for the foundation pit 11.

[0053] At least one pair of locks 221 for connecting with other lock steel pipe piles is provided on the side wall of the steel pipe pile. The locks 221 can be installed on the pedestal provided on the cofferdam after the steel pipe pile is transported to the cofferdam, or they can be installed on the steel pipe pile before transportation. This application does not limit this.

[0054] In addition, the steel pipe piles may be transported in multiple sections before transportation, and then installed to form the steel pipe piles required for support after being transported to the foundation; or they may be installed as the required steel pipe piles before transportation, and this application does not limit this.

[0055] In order to enable the external support structure 22 to form a better supporting force, it is also necessary to provide the external support structure 22 with a thrust toward the outside of the foundation pit 11 to resist the inclination force of the outer wall of the foundation pit 11 toward the inner cavity of the foundation pit 11, thereby assisting the external support structure 22 to better support the foundation pit 11.

[0056] The structure that provides thrust is the purlin 33, and the structure of the purlin 33 also matches the structure of the foundation pit 11, that is, if the foundation pit 11 is a rectangular parallelepiped, then the purlin 33 is a rectangular structure smaller than the foundation pit 11. The difference between the purlin 33 and the external support structure 22 is that the height of the purlin 33 is smaller than the external support structure 22. Because the external support structure 22 is the main supporting structure, if a structure similar to or close to the structure of the external support structure 22 is set for the external support structure 22, it will cause a waste of resources, increase the construction process, and slow down the progress of the construction. Therefore, it is not necessary to set the structure of the purlin 33 to be the same as the external support structure 22.

[0057] like Figure 2 As shown, Figure 2 It is a top view of a foundation pit 11. The purlin 33 can be set at the middle position, one-third position, two-thirds position, etc. of the height direction of the external supporting structure 22. The specific position of the purlin 33 is set according to the pre-set construction drawings and will not be repeated here.

[0058] For the convenience of installation, I-beams or H-beams may be used to form the purlin 33. For example, Figure 3As shown, in order to improve the integrity and strength of the purlin 33, the purlin 33 can be arranged in a double-jointed form. It should be noted that, for the convenience of transportation, the I-beam or H-beam required for assembling the purlin 33 can be transported to the foundation first and then assembled to form the purlin 33.

[0059] In order to form a good cooperative support relationship between the purlin 33 and the external support structure 22, a plurality of support point reinforcement structures 331 may be provided on the side wall of the external support structure 22, the purlin 33 may be erected on the plurality of support point reinforcement structures 331, and the purlin 33 may be connected to the support point reinforcement structures 331 by welding, clamping, bolting, etc. In addition, the support point reinforcement structures 331 may also be connected to the external support structure 22 by welding, clamping, bolting, etc.

[0060] Similarly, since the purlin 33 is arranged in close contact with the external support structure 22, it can play a role in strengthening the supporting force of the external support structure 22, but it is also necessary to strengthen the thrust toward the outside of the foundation pit 11, which can be achieved by the first support part 44 and the second support part 55.

[0061] Combine the following Figure 4 The first support portion 44 and the second support portion 55 are introduced as follows:

[0062] like Figure 4 As shown, the first support portion 44 is used to support adjacent sides of the purlin 33. Exemplarily, if the purlin 33 is a rectangle, the first support portion 44 is used to support adjacent lengths and widths of the purlin 33. Since the rectangle includes a pair of long sides and a pair of wide sides, the first support portion 44 includes at least four.

[0063] In another embodiment, Figure 5 As shown, if the purlin 33 is a square, two parallel first support portions 44 of different sizes may be respectively provided at the four corners of the square to provide better support for two adjacent sides of the purlin 33 .

[0064] It should be noted here that the number of the first support parts 44 is not limited here, and can be set according to the shape of the foundation pit 11, construction requirements, the structure of the surrounding purlin 33 and other data.

[0065] Since the supporting parts in the prior art are mostly an integral structure, after the foundation pit 11 is successfully excavated, it is necessary to insert steel bars at the bottom of the foundation pit 11. The steel bars will extend from the bottom to the top of the foundation pit 11, so the steel bars will inevitably pass through the supporting parts set on the purlin 33. However, the existing supporting parts are mostly integral structures, and the steel bars cannot pass through them. They can only be cut off or the position of the steel bars can be readjusted to meet the design requirements. In addition, the existing supporting parts cannot be permanently cast in the pedestal as the structure of the cofferdam, and they need to be dismantled later, which undoubtedly increases the construction process and reduces the construction efficiency. Therefore, the present application sets the first supporting part 44 as a grid structure, such as Figure 6 As shown, the first support portion 44 can be assembled from a plurality of sub-support portions, and the shape of each sub-support portion can be the same or different. The sub-support portion can be, for example, a cube structure, a rectangular parallelepiped structure, a polyhedron structure, etc., and the sub-support portion can be a hollow structure formed by connecting a plurality of steel sections end to end, such as Figure 7 or Figure 8 As shown, the sub-support part is a hollow cube structure. Exemplarily, the steel sections constituting the sub-support part are, for example, H-shaped steel, I-shaped steel, and the like.

[0066] Continue as Figure 4 As shown, the second support portion 55 is used to support the opposite sides of the purlin 33. In order to save resources, only part of the opposite sides of the purlin 33 may be supported. For example, if the purlin 33 is rectangular, the second support portion 55 is used to support the two long sides of the purlin 33. The second support portion 55 may include only one or more, which is not limited. The shape of the second support portion 55 is the same as that of the first support portion 44, and both are assembled by multiple sub-support portions, which will not be described in detail here.

[0067] Among them, the part of the first support part 44 that contacts the purlin 33 can be connected to the purlin 33 by means of clamping, welding, bolting, etc.; similarly, the part of the second support part 55 that contacts the purlin 33 can also be connected to the purlin 33 by means of clamping, welding, bolting, etc.

[0068] In another embodiment, in order to improve the integrity of the two ends of the first support portion 44 and the second support portion 55, and to strengthen the strength of the connection between the first support portion 44, the second support portion 55 and the purlin 33, the two ends of the first support portion 44 can be connected to the two adjacent sides of the purlin 33 through the first reinforcement structure 441, and the two ends of the second support portion 55 can be connected to the two opposite sides of the purlin 33 through the second reinforcement structure 551. The shape of the first reinforcement structure 441 can be the same as that of the second reinforcement structure 551, or it can be different. Exemplarily, the shapes of the first reinforcement structure 441 and the second reinforcement structure 551 are as follows: Fig. 9 shown.

[0069] Continue as Figure 4 As shown, if the purlin 33 is rectangular, two second support parts 55 are provided to support the opposite long sides of the purlin 33. In order to further strengthen the supporting effect of the second support parts 55 and prevent the second support parts 55 from being too long and causing deflection, a vertical support frame 66 may be provided in the middle position of the second support part 55 along the width direction of the foundation pit 11. The vertical support frame 66 extends from the bottom of the foundation pit 11 to the second support part 55 and is connected to the second support part 55, and the vertical support frame 66 is a grid structure.

[0070] For example, if there is only one second support portion 55, the vertical support frame 66 can be extended to the surface of the second support portion 55 facing the bottom of the foundation pit 11 so that it abuts against a portion of the second support portion 55. In addition, the portion of the second support portion 55 that can abut against it can be connected by means of clamping, welding, bolting, wire binding, etc.

[0071] Exemplarily, if there are two second support portions 55 and the two second support portions 55 are spaced apart, a vertical support frame 66 may be provided on the side of one of the second support portions 55, and a vertical support frame 66 may be provided on the side of the other second support portion 55, and the two vertical support frames 66 may be connected to the side surfaces of the corresponding second support portions 55 respectively by means of clamping, welding, bolt connection, wire binding, etc.

[0072] For example, if there are two second support parts 55, the vertical support frames 66 can be respectively extended from the bottom of the foundation pit 11 to the corresponding surfaces of the second support parts 55 facing the bottom of the foundation pit 11, so that the upper end surfaces of the vertical support frames 66 are respectively abutted against the corresponding parts of the second support parts 55. In addition, the parts of the second support parts 55 that can abut therewith can be connected to the vertical support frames 66 by means of clamping, welding, bolting, wire binding, etc., which is not limited in the present application.

[0073] For example, if there are two second support parts 55, and the two second support parts 55 are arranged at intervals, a vertical support frame 66 may be arranged on the side of one of the second support parts 55, and a vertical support frame 66 may be arranged on the side of the other second support part 55, and a transverse support beam 77 may be arranged for the two vertical support frames 66 to provide transverse support force for the two vertical support frames 66, further improving the supporting function of the second support parts 55. The transverse support beam 77 may be connected to the two vertical support frames 66 by means of clamping, welding, bolt connection, wire binding, etc., which is not limited in the present application.

[0074] It should be noted here that the number of second support frames can also be three, four, five, etc. The support method of multiple second support frames is described above. The only difference is the number of vertical support frames 66 and horizontal support beams 77, which will not be elaborated here.

[0075] According to the above design, after the foundation pit 11 is excavated to the designed bottom surface, if it is necessary to connect the above structure by tying steel bars, after the steel bars are tied, it is also necessary to support the concrete formwork. For example, a wooden formwork can be supported for the second support part 55, and a shaped steel formwork can be supported for the other positions. After the formwork is successfully supported, the cushion layer is poured. During the pouring process, since the first support part 44, the second support part 55, the vertical support frame 66 and the transverse support beam 77 are all grid structures, these structures can be cast in the permanent pedestal as temporary structures, not as demolished structures. This can not only reduce the construction process and speed up the construction progress, but also improve the safety of the cofferdam structure.

[0076] In addition, in order to prevent the first support part 44, the second support part 55, the vertical support frame 66 and the transverse support beam 77 from forming a corrosion channel in the concrete pedestal, the connecting points of the segments in the first support part 44, the second support part 55, the vertical support frame 66 and the transverse support beam 77 can be set on the outside of the pedestal reinforcement, and grooves can be reserved when pouring concrete. After the external segments are removed at a later time, the grooves can be repaired to close the corrosion channels.

[0077] The present application discloses a cofferdam support structure, in which the purlin 33 in the cofferdam support structure is supported by a grid-type first support part 44 for supporting the adjacent sides of the purlin 33, and by a grid-type second support part 55 for supporting the opposite sides of the purlin 33. The grid-type structure of the first support part 44 and the second support part 55 enables the base steel bars to pass therethrough, so there is no need to perform treatments such as truncation and displacement on the base steel bars, and the base steel bars can be tied in place at one time. In addition, the grid-type structure facilitates the subsequent pouring of the cushion layer, so that the concrete can fill the gaps in the first support part 44 and the second support part 55, without affecting the stability of the overall structure, and does not need to be dismantled in the later stage, which can reduce the construction process and improve the construction efficiency.

[0078] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A cofferdam support structure, characterized in that: include: A purlin (33) formed by steel sections and having a shape matching the foundation pit (11); A first supporting portion (44) and a second supporting portion (55), wherein the first supporting portion (44) and the second supporting portion (55) are both grid-type structures; Two ends of the first supporting portion (44) are respectively connected to two adjacent sides of the surrounding purlin (33); Two ends of the second supporting portion (55) are respectively connected to two opposite sides of the surrounding purlin (33).

2. The cofferdam support structure according to claim 1, characterized in that: Two ends of the first supporting portion (44) are respectively connected to two adjacent sides of the surrounding purlin (33) via a first reinforcing structure (441); Two ends of the second supporting portion (55) are respectively connected to two opposite sides of the surrounding purlin (33) via a second reinforcing structure (551).

3. The cofferdam support structure according to claim 1, characterized in that: Also includes: a vertical support frame (66) arranged corresponding to the second support portion (55); The vertical support frame (66) extends from the bottom of the foundation pit to the second support portion (55) and is connected to the second support portion (55). The vertical support frame (66) is a grid structure.

4. The cofferdam support structure according to claim 3, characterized in that: The vertical support frame (66) includes at least one pair and further includes: The transverse support beam (77) comprises a first end and a second end, wherein the first end is connected to one of the vertical support frames (66) of the at least one pair of vertical support frames (66), and the second end is connected to the other vertical support frame (66) of the at least one pair of vertical support frames (66), and the transverse support beam (77) is a grid structure.

5. The cofferdam support structure according to claim 2, characterized in that: First connecting parts are provided at both ends of the first supporting part (44), and the first connecting parts are connected to the first reinforcing structure (441); Second connecting portions are provided at both ends of the second supporting portion (55), and the second connecting portions are connected to the first reinforcing structure (441).

6. The cofferdam support structure according to claim 1, characterized in that: The steel sections are double-jointed to form the surrounding purlin (33).

7. The cofferdam support structure according to claim 1, characterized in that: The grid structure is a hollow structure in which a plurality of steel sections are connected end to end.

8. The cofferdam support structure according to claim 1, characterized in that: It also comprises an external supporting structure (22), the shape of the external supporting structure (22) matches the shape of the foundation pit (11), and the surrounding purlin (33) is arranged on the inner wall of the external supporting structure (22).

9. The cofferdam support structure according to claim 8, characterized in that: The external support structure (22) comprises a plurality of locking steel pipe piles, and the plurality of locking steel pipe piles are arranged adjacent to and perpendicular to the bottom of the foundation pit (11).

10. The cofferdam support structure according to claim 8, characterized in that: A plurality of support point reinforcement structures (331) are vertically arranged on the inner wall of the external support structure (22), and the surrounding purlin (33) is erected on the plurality of support point reinforcement structures (331).

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