Cofferdam large-dip-angle inner support stabilizing structure and support changing method

Abstract

The invention provides a cofferdam large-dip-angle inner support stabilizing structure which comprises a connector device, an embedded anchor bar and an inclined strut are connected to the connector device, the embedded anchor bar is embedded in a bearing platform, the inclined strut is connected with an embedded part on a pier body, and the connector device is in a T shape and comprises a left connecting part, a right connecting part and a lower connecting part. The left connecting part is connected with the steel cofferdam, the right connecting part is connected with the inclined strut, and the lower connecting part is connected with the embedded anchor bar. Compared with a conventional mode that inclined struts are replaced on the inner wall of the steel cofferdam, the cofferdam large-inclination-angle inner support stabilizing structure has the advantages that the vertical inclination angle is increased, and a larger vertical operation space is provided for a steel cofferdam structure with the limited horizontal space. Compared with a conventional support changing method, the cofferdam large-dip-angle inner support stabilizing structure is beneficial for reducing wall plate stress in the steel cofferdam support changing range and optimizing the cofferdam structure, the fixing mode is reliable, the environment adaptability is high, and economic benefits of cofferdam construction under specific conditions are large.

Description

Technical Field

[0001] The invention belongs to the technical field of cofferdam construction, and in particular relates to a cofferdam large-angle internal support stabilizing structure and a support replacement method. Background Art

[0002] In the steel cofferdam replacement process, conventional diagonal bracing is replaced with a small vertical inclination angle. If there is not enough horizontal space, normal construction cannot be carried out. In the prior art, conventional diagonal bracing is directly supported on the cofferdam side wall during replacement. In addition to the effective horizontal resistance, direct support will produce vertical invalid stress that affects the bearing capacity of the cofferdam structure, thus requiring additional structural reinforcement, especially for cofferdams with limited structural design such as large draft depth. Therefore, a cofferdam large inclination angle internal support replacement device was invented to address the problem of internal support replacement in a narrow space that conventional structures are not suitable for. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a stable structure of internal support with a large inclination angle of the cofferdam and a support replacement method, which is conducive to providing additional construction space to accommodate larger equipment such as standard climbing formwork.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A stable internal support structure for a cofferdam with a large inclination angle comprises a joint device, on which embedded anchor bars and diagonal braces are connected, the embedded anchor bars are embedded in the pedestal, and the diagonal braces are connected to embedded parts on the pier body, the joint device is T-shaped, comprising a left connecting part, a right connecting part and a lower connecting part, the left connecting part is connected to a steel cofferdam, the right connecting part is connected to the diagonal brace, and the lower connecting part is connected to the embedded anchor bars, or the joint device is L-shaped, comprising a transverse connecting part and a vertical connecting part, the transverse connecting part is connected to the diagonal brace, the vertical connecting part is connected to the embedded anchor bars, and the end face of the vertical connecting part on one side different from the transverse connecting part is connected to the steel cofferdam.

[0006] Furthermore, the angle between the diagonal brace and the upper part of the cofferdam is an obtuse angle.

[0007] Furthermore, the diagonal brace and the clamp on the upper part of the pier body form an acute angle.

[0008] Furthermore, an angle support is provided at the angle between the abutment and the pier body, and the angle support is triangular.

[0009] Furthermore, the joint device is arranged near the middle of the steel cofferdam.

[0010] Furthermore, the connection position between the diagonal brace and the pier body is located at the lower part of the pier body.

[0011] A method for replacing support using the above-mentioned cofferdam large-angle internal support stabilizing structure comprises the following steps:

[0012] S1. Prepare sufficient anchor bars according to the calculation results and fix them in place by anchoring measures before pouring the cap.

[0013] S2, pouring the foundation and forming pre-buried anchor bars;

[0014] S3. After the pouring of the cap is completed, the pier body is constructed. According to the determined maximum inclination angle, embedded parts are buried at the corresponding positions of the pier body;

[0015] S4. When the steel cofferdam is to be replaced, the diagonal brace is placed in place first, and then the embedded anchor bars are installed on the joint device of the diagonal brace and tightened;

[0016] S5. When replacing the support, according to the pre-tensioning design results, anchor the anchor bars at the joints until the diagonal support is tightened.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The invention provides a stable structure of internal support with a large inclination angle for the cofferdam. Compared with conventional diagonal support replacement on the inner wall of the steel cofferdam, the invention increases the vertical inclination angle and provides a larger vertical operation space for the steel cofferdam structure with limited horizontal space. Compared with conventional replacement support methods, the stable structure of internal support with a large inclination angle for the cofferdam helps to reduce the wall plate stress within the replacement support range of the steel cofferdam, optimize the cofferdam structure, especially for cofferdams with a large draft depth and other factors that have a greater impact on the position of the internal support, and the fixing method is reliable and has strong environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 The present invention is a schematic diagram of a stable structure of inner support of a cofferdam with a large inclination angle. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] A cofferdam with a large inclination angle and internal support for stable structure, such as Figure 1 As shown, it includes a joint device 6, on which embedded anchor bars 3 and diagonal braces 4 are connected, the embedded anchor bars are embedded in the pedestal 1, and the diagonal braces are connected to the embedded parts 8 on the pier body 2, the joint device is T-shaped, including a left connecting part, a right connecting part and a lower connecting part, the left connecting part is connected to the steel cofferdam 7, the right connecting part is connected to the diagonal brace, and the lower connecting part is connected to the embedded anchor bars, or, the joint device is L-shaped, including a transverse connecting part and a vertical connecting part, the transverse connecting part is connected to the diagonal brace, the vertical connecting part is connected to the embedded anchor bars, and the end face of the vertical connecting part on one side different from the transverse connecting part is connected to the steel cofferdam.

[0026] The angle between the diagonal brace and the upper part of the cofferdam is an obtuse angle. The angle between the diagonal brace and the clamp on the upper part of the pier body is an acute angle. An angle support is provided at the angle between the abutment and the pier body, and the angle support is triangular. The joint device is provided near the middle of the steel cofferdam. The connection position between the diagonal brace and the pier body is at the lower part of the pier body.

[0027] A method for replacing support using the above-mentioned cofferdam large-angle internal support stabilizing structure comprises the following steps:

[0028] S1. Prepare sufficient anchor bars according to the calculation results and fix them in place by anchoring measures before pouring the cap.

[0029] S2, pouring the foundation and forming pre-buried anchor bars;

[0030] S3. After the pouring of the cap is completed, the pier body is constructed. According to the determined maximum inclination angle, embedded parts are buried at the corresponding positions of the pier body;

[0031] S4. When the steel cofferdam is to be replaced, the diagonal brace is first placed in place, and then the exposed part 5 of the embedded anchor bar is installed on the joint device of the diagonal brace part and tightened;

[0032] S5. When replacing the support, according to the pre-tensioning design results, anchor the anchor bars at the joints until the diagonal support is tightened.

[0033] The invention provides a stable structure of internal support with a large inclination angle for the cofferdam. Compared with conventional diagonal support replacement on the inner wall of the steel cofferdam, the invention increases the vertical inclination angle and provides a larger vertical operation space for the steel cofferdam structure with limited horizontal space. Compared with conventional replacement support methods, the stable structure of internal support with a large inclination angle for the cofferdam helps to reduce the wall plate stress within the replacement support range of the steel cofferdam, optimize the cofferdam structure, especially for cofferdams with a large draft depth and other factors that have a greater impact on the position of the internal support, and the fixing method is reliable and has strong environmental adaptability.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stable internal support structure for a cofferdam with a large inclination angle, characterized in that: It includes a joint device, on which embedded anchor bars and diagonal braces are connected, the embedded anchor bars are embedded in the pedestal, and the diagonal braces are connected to the embedded parts on the pier body. The joint device is T-shaped, including a left connecting part, a right connecting part and a lower connecting part, the left connecting part is connected to the steel cofferdam, the right connecting part is connected to the diagonal brace, and the lower connecting part is connected to the embedded anchor bars, or the joint device is L-shaped, including a transverse connecting part and a vertical connecting part, the transverse connecting part is connected to the diagonal brace, the vertical connecting part is connected to the embedded anchor bars, and the end face of the vertical connecting part on one side different from the transverse connecting part is connected to the steel cofferdam.

2. A cofferdam large-angle internal support stable structure according to claim 1, characterized in that: The angle between the diagonal brace and the upper part of the cofferdam is an obtuse angle.

3. The large-angle internal support stable structure of the cofferdam according to claim 1 is characterized by: The diagonal brace and the clamp on the upper part of the pier body form an acute angle.

4. The large-angle internal support stable structure of a cofferdam according to claim 1 is characterized by: Angle supports are provided at the angle between the abutment and the pier body, and the corner supports are triangular in shape.

5. The large-angle internal support stable structure of the cofferdam according to claim 1 is characterized by: The joint device is arranged near the middle of the steel cofferdam.

6. The large-angle internal support stable structure of the cofferdam according to claim 1 is characterized by: The connection position between the diagonal brace and the pier body is at the lower part of the pier body.

7. A method for replacing support using the stable structure of inner support of a cofferdam with a large inclination angle as claimed in claim 1, characterized in that: The steps include: S1. Prepare sufficient anchor bars according to the calculation results and fix them in place by anchoring measures before pouring the cap. S2, pouring the foundation and forming pre-buried anchor bars; S3. After the pouring of the cap is completed, the pier body is constructed. According to the determined maximum inclination angle, embedded parts are buried at the corresponding positions of the pier body; S4. When the steel cofferdam is to be replaced, the diagonal brace is placed in place first, and then the embedded anchor bars are installed on the joint device of the diagonal brace and tightened; S5. When replacing the support, according to the pre-tensioning design results, anchor the anchor bars at the joints until the diagonal support is tightened.

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