Method for installing bottom die of low-pier capping beam

Abstract

The invention relates to the technical field of installation of bottom dies for bridge cover beams, and provides a low-pier cover beam bottom die installation method which comprises the following steps: hardening a foundation site, and controlling the top surface elevation of the hardened site; distributive girders are laid on the surface of the hardened site, then adjustable wedge blocks are laid on the distributive girders, and the overall height of the distributive girders and the adjustable wedge blocks is controlled; a bottom die is installed on the adjustable wedge blocks, the adjustable wedge blocks are adjusted to control the elevation of the bottom die and fix the position of the bottom die, and after the bottom die is installed, construction is conducted on the basis of the bottom die to form the bent cap; and after the bent cap is formed, the adjustable wedge blocks are dismantled, so that the bottom die is separated from the bent cap concrete, and the bottom die is dismantled and moved away. The problems that in a traditional scheme, installation of the bottom die is limited by the height, and the bottom die for the low-pier bent cap cannot be effectively installed can be effectively solved, installation of the bottom die for the low-pier bent cap can be fast and efficient, the supporting strength can be guaranteed, and the construction efficiency and quality of the bent cap can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bottom form installation for bridge bent cap, and particularly relates to a bottom form installation method for low-pier bent cap. BACKGROUND

[0002] In the construction process of a bridge bent cap, the installation of a bent cap bottom form is usually required first, and then bent cap pouring construction is carried out on the basis of the bottom form. The traditional bottom form installation scheme usually adopts a full-support formwork frame or a steel pipe Bailey frame.

[0003] As is known, the full-support formwork frame is commonly used in a bowl-dog type scaffold, a disc-dog type scaffold or a fastener type steel pipe scaffold. After foundation treatment, vertical poles are arranged in the projection range of the bent cap bottom, and a spatial grid structure is formed through horizontal poles and scissors braces, and the minimum erection height is not less than 1.5 m.

[0004] The steel pipe column Bailey frame is composed of a steel pipe column, a sand box, a distribution beam, a Bailey beam, a bottom form, a side form and supports from bottom to top. A steel plate is embedded on a pile cap or an enlarged foundation for welding and fixing the steel pipe pile, and the minimum erection height is not less than 3.0 m.

[0005] In the above traditional scheme, because of the minimum height limitation, the support system of the above conventional steel form cannot be implemented in the construction process of a low-pier bent cap, because the space for installing the bottom form of the low-pier bent cap is narrow, and the working height is less than 1.5 m, which does not meet the working conditions of the full-support frame or the steel pipe Bailey frame. SUMMARY

[0006] The present application aims to solve at least one technical problem in the background art, and provides a bottom form installation method for a low-pier bent cap.

[0007] To achieve the above-mentioned purpose, the present application provides a bottom form installation method for a low-pier bent cap, comprising: hardening treatment is performed on the foundation site for installing the bottom form of the low-pier bent cap, and the top surface elevation of the site after the hardening treatment is controlled; a distribution beam is laid on the surface of the hardening site according to the projection range of the bent cap, and then an adjustable wedge is laid on the distribution beam, the overall height of the distribution beam and the adjustable wedge is controlled, and the overall height of the distribution beam and the adjustable wedge is aligned with the top of the pier column or the pile cap; the bottom form of the low-pier bent cap is installed on the adjustable wedge, the elevation of the bottom form is controlled by adjusting the adjustable wedge, and the position of the bottom form is fixed, after the installation of the bottom form is completed, reinforcement, formwork, concrete and prestress construction are carried out on the basis of the bottom form to form a bent cap; after the bent cap is formed, the adjustable wedge is removed, the bottom form is separated from the bent cap concrete, the bottom form is disassembled and removed.

[0008] According to one aspect of the present application, the method for hardening the ground site for installing the bottom mold of the low pier cap beam and controlling the top surface elevation of the hardening site comprises: The ground site on both sides of the cap beam transverse bridge is subjected to site hardening treatment, and the site hardening treatment is to lay 50 cm thick slag on the site surface, and then lay 20 cm thick C20 concrete cushion on the slag; The top surface elevation of the C20 concrete cushion is controlled to be 15 cm lower than the top surface elevation of the pier column or pile cap embedded and fixed in the ground for supporting the cap beam.

[0009] According to one aspect of the present application, the method for laying distribution beams on the hardening site surface according to the projection range of the cap beam, and then laying adjustable wedges on the distribution beams, and controlling the overall height of the distribution beams and the adjustable wedges comprises: The projection range of the cap beam is marked on the hardening site surface, the distribution beams are laid on the site surface along the transverse bridge direction at intervals after the projection range is marked, and then the adjustable wedges are installed at the intersection of each distribution beam and the bottom model steel support; The overall height of the distribution beams and the adjustable wedges is controlled so that the top surface of the adjustable wedge is aligned with the top of the pier column or the top of the pile cap.

[0010] According to one aspect of the present application, the adjustable wedge is formed by two triangular wooden wedges or a finished wedge.

[0011] According to one aspect of the present application, the method for installing the bottom mold of the low pier cap beam on the adjustable wedge, adjusting the adjustable wedge to control the elevation of the bottom mold and fixing the position of the bottom mold comprises: Each section of the structure of the bottom mold is hoisted by a crane, the bottom model steel support is supported on the adjustable wedge, the bottom mold is assembled in sections and fixed by high-strength bolts; The adjustable wedge is adjusted, whether the bottom mold is smooth is detected by a level, and the detection is repeatedly corrected until the elevation and position of the bottom mold are accurate.

[0012] According to one aspect of the present application, the method for removing the adjustable wedge, separating the bottom mold from the cap beam concrete, disassembling the bottom mold and moving away the bottom mold comprises: The adjustable wedges are knocked off one by one so that the bottom mold is separated from the cap beam concrete surface; The high-strength bolts are removed, and then each section of the structure of the bottom mold is moved away by a crane.

[0013] According to the scheme of the present application, for the problem of narrow lower space existing in low pier cap beam, operation height is lower than 1.5m, and operation conditions without full support or steel pipe Bailey frame, the present application supports the bottom mold through the way of laying distribution beam and adjustable wedge on the hardened ground surface, adjusts the position of the fixed bottom mold through the adjustable wedge, and then pours and constructs the cap beam, knocks the adjustable wedge to remove the bottom mold after the cap beam construction is completed, which can effectively solve the problem that the installation of the bottom mold is limited by height in the traditional scheme, and the bottom mold for the low pier cap beam cannot be effectively installed, so that the installation of the low pier cap beam bottom mold is fast and efficient, the construction cost is low, and the support strength, construction efficiency and quality can be guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 a flow chart schematically showing a low pier cap beam bottom mold installation method according to an embodiment of the present application; Figure 2 a sectional view schematically showing a low pier cap beam bottom mold installation structure according to an embodiment of the present application; Figure 3 a structural arrangement view schematically showing an adjustable wedge according to an embodiment of the present application. DETAILED DESCRIPTION

[0015] The present application will now be discussed with reference to example embodiments. It should be appreciated that the discussed embodiments are merely for the purpose of enabling those of ordinary skill in the art to better understand and therefore implement the present application, and are not intended to imply any limitation on the scope of the present application.

[0016] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including, but not limited to," in connection with any device, method, or process described herein. The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment."

[0017] Figure 1 a flow chart schematically showing a low pier cap beam bottom mold installation method according to an embodiment of the present application; Figure 2 a sectional view schematically showing a low pier cap beam bottom mold installation structure according to an embodiment of the present application. As Figure 1 and Figure 2 shown in the present embodiment, the low pier cap beam bottom mold installation method comprises: hardening treatment is performed on the ground site for installing the bottom mold of the low pier cap beam, and the top surface elevation of the site after the hardening treatment is controlled; According to the projection range of the bent cap, a distribution beam 1 is laid on the hardened site surface, and then an adjustable wedge 2 is installed on the distribution beam 1, the overall height of the distribution beam 1 and the adjustable wedge 2 is controlled, and the overall height of the distribution beam 1 and the adjustable wedge 2 is aligned with the top of the pier column 3 or the top of the pile cap; A bottom die 4 of the low-pier bent cap is installed on the adjustable wedge 2, the elevation of the bottom die 4 is adjusted and the position of the bottom die is fixed, under the action of static friction, the distribution beam, the adjustable wedge and the bottom die can form a temporarily stable system, after the bottom die is installed, the reinforcement, the formwork, the concrete and the prestress construction are carried out on the basis of the bottom die to form the bent cap 5. After the bent cap 5 is formed, the adjustable wedge 2 is removed, the bottom die 4 is separated from the concrete of the bent cap 5, and the bottom die 4 is disassembled and removed.

[0018] Further, according to an embodiment of the present application, the ground site for installing the bottom die of the low-pier bent cap is subjected to hardening treatment, and the top surface elevation of the site after the hardening treatment is controlled, comprising: The ground site on both sides of the bent cap in the transverse direction of the bridge is subjected to site hardening treatment, and the site hardening treatment is to lay 50cm-thick slag 6 on the site surface, and then lay 20cm-thick C20 concrete cushion 7 on the slag. The top surface elevation of the C20 concrete cushion 7 is controlled to be 15cm lower than the top surface elevation of the pier column 3 or the top of the pile cap embedded and fixed in the ground for supporting the bent cap.

[0019] Further, according to an embodiment of the present application, according to the projection range of the bent cap, a distribution beam 1 is laid on the hardened site surface, and then an adjustable wedge 2 is installed on the distribution beam 1, the overall height of the distribution beam 1 and the adjustable wedge 2 is controlled, comprising: The projection range of the bent cap is marked on the hardened site surface, the distribution beam 1 is laid on the site surface along the longitudinal direction at intervals after the projection range is marked, and then the adjustable wedge 2 is laid on each distribution beam 1 along the transverse direction at intervals; The overall height of the distribution beam 1 and the adjustable wedge 2 is controlled, so that the top surface of the adjustable wedge 2 is aligned with the top of the pier column 3 or the top of the pile cap.

[0020] Further, Figure 3 The structural arrangement diagram of the adjustable wedge according to an embodiment of the present application is schematically shown. As shown in the embodiment, Figure 3 The adjustable wedge 2 is formed by two triangular wooden wedges 8 in the embodiment. In this way, the adjustable wedge 2 can be first stably supported on the distribution beam 1, and then knocked down quickly and labor-savingly by knocking with a hammer or the like after the pouring construction of the bent cap is completed, so that the process of disassembling the bottom die is convenient and fast.

[0021] Further, according to an embodiment of the present application, the bottom die 4 of the low pier bent cap is installed on the adjustable wedge 2, the height of the bottom die 4 is adjusted and the position of the bottom die 4 is fixed by adjusting the adjustable wedge 2, comprising: Each segment structure of the bottom die 4 is hoisted by a crane, the secondary ridge of each segment structure of the bottom die 4 is supported on the adjustable wedge 2, the bottom die 4 is assembled in segments and fixed by high-strength bolts; The adjustable wedge 2 is adjusted, whether the bottom die 4 is smooth is detected by a level, and the detection is repeatedly corrected until the height and position of the bottom die 4 are accurate.

[0022] Further, according to an embodiment of the present application, the adjustable wedge 2 is removed, the bottom die 4 is separated from the concrete of the bent cap 5, and the bottom die 4 is disassembled and removed, comprising: The adjustable wedge 2 is knocked off one by one, so that the bottom die 4 is separated from the concrete surface of the bent cap 5; The high-strength bolts are removed, and then each segment structure of the bottom die 4 is removed by a crane.

[0023] According to the above scheme of the present application, for the problem that the space below the low pier bent cap is narrow, the working height is lower than 1.5m, and the working conditions do not have full support or steel pipe Bailey support, the present application supports the bottom die by hardening the ground surface and laying distribution beams and adjustable wedges on the hardened ground surface, pours and constructs the bent cap after adjusting and fixing the position of the bottom die by the adjustable wedge, and removes the bottom die by knocking the adjustable wedge after the bent cap construction is completed. This process can effectively solve the problem that the installation of the bottom die is limited by height in the traditional scheme, and the bottom die for the low pier bent cap cannot be effectively installed. The installation of the bottom die for the low pier bent cap is fast and efficient, and the support strength, construction efficiency and quality of the bent cap can be guaranteed.

[0024] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

[0025] It should be understood that the sequence of the steps in the summary and embodiments of the present application does not absolutely mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A method of installing a low pier cap beam form, characterised by, include: The foundation site for installing the bottom formwork of the low pier cap beam is hardened, and the elevation of the top surface of the site after hardening is controlled. Based on the projection range of the cap beam, a distribution beam is laid on the hardened site surface, and then an adjustable wedge is laid on the distribution beam to control the overall height of the distribution beam and the adjustable wedge, so that the overall height of the distribution beam and the adjustable wedge is aligned with the top of the pier or cap. Install the bottom formwork of the low pier cap beam on the adjustable wedge block, adjust the adjustable wedge block to control the elevation of the bottom formwork and fix the position of the bottom formwork. After the bottom formwork is installed, carry out the construction of reinforcement, formwork, concrete and prestressing on the basis of the bottom formwork to form the cap beam. After the cap beam is formed, the adjustable wedges are removed to separate the bottom formwork from the cap beam concrete. The bottom formwork is then disassembled and removed.

2. The low pier bent cap form installation method of claim 1, wherein, The process of hardening the foundation site for installing the bottom formwork of the low pier cap beam, and controlling the elevation of the top surface of the hardened site, includes: The foundation sites on both sides of the transverse direction of the cap beam are hardened by laying a 50cm thick layer of rough slag on the ground surface, and then laying a 20cm thick C20 concrete cushion layer on the rough slag. The elevation of the top surface of the C20 concrete cushion layer should be 15cm lower than the elevation of the top surface of the pier or foundation embedded in the foundation to support the cap beam.

3. The method of installing a low pier bent cap form bottom form of claim 1, wherein, The process of laying distribution beams on the hardened ground surface according to the projection range of the cap beam, and then laying adjustable wedges on the distribution beams to control the overall height of the distribution beams and adjustable wedges includes: Mark the projection range of the cap beam on the hardened site surface. Lay the distribution beams at intervals along the transverse direction on the site surface marked with the projection range. Then install adjustable wedges at the intersection of each distribution beam and the bottom model steel support. Control the overall height of the distribution beam and the adjustable wedge so that the top surface of the adjustable wedge is aligned with the top of the pier column or the top of the foundation.

4. The method of installing a low pier bent cap form bottom of claim 1, wherein, The adjustable wedge is formed by joining two triangular wooden wedges.

5. The method of installing a low pier bent cap form bottom of claim 1, wherein, The process of installing the bottom formwork of the low pier cap beam on the adjustable wedges, adjusting the adjustable wedges to control the elevation of the bottom formwork and fixing its position includes: The bottom formwork is lifted by a crane, and the secondary supports of each section of the bottom formwork are placed on adjustable wedges. The bottom formwork is then assembled in sections and fixed with high-strength bolts. Adjust the adjustable wedges and use a level to check if the bottom mold is smooth. Repeat the calibration and testing until the bottom mold elevation and position are accurate.

6. The low pier bent cap form installation method according to any one of claims 1-7, wherein, The removal of the adjustable wedges to separate the bottom formwork from the cap beam concrete, dismantling and removing the bottom formwork includes: The adjustable wedges are knocked off one by one, causing the bottom formwork to detach from the concrete surface of the cap beam; Remove the high-strength bolts, and then use a crane to move each section of the bottom formwork away.

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