A combined stirrup installation method for cast-in-situ hollow thin-wall high piers

Abstract

The present invention relates to a method for installing combined stirrups of cast-in-situ hollow thin-walled high piers, which includes first installing the outer formwork and inner formwork of the hollow thin-walled high pier, then installing the main reinforcement bars and carrying out the installation of combined stirrups, and finally pouring concrete, and constructing section by section until the construction of the entire hollow thin-walled high pier is completed. The combined stirrups assembled, tied and temporarily fixed on the falsework are installed to the designated module of the hollow thin-walled high pier by a crane. After that, each module of the hollow thin-walled high pier is connected, and by means of "building blocks", the purpose of quickly and high-quality installing the stirrups of the thin-walled high pier is achieved.

Description

Technical Field

[0001] The present invention relates to a method for installing combined stirrups of cast-in-situ hollow thin-wall high piers. Background Art

[0002] The conventional method is to process various types of stirrups in the steel bar processing area, manually put the stirrups one by one from the top of the main bars to the designated positions, and set the spacing according to the design requirements, so as to achieve the purpose of installing the pier stirrups. In the existing engineering construction, restricted by the terrain conditions, thin-wall hollow piers often adopt high piers with large cross-sections. The transverse staggered design of the stirrups is complex, there are serious quality and safety hazards during the installation process, and the implementation difficulty is large, the construction period is long, and the conventional method is difficult to meet the needs of engineering construction. Summary of the Invention

[0003] The present invention provides a method for installing combined stirrups of cast-in-situ hollow thin-wall high piers, which is realized by adopting the following technical solutions:

[0004] A method for installing combined stirrups of cast-in-situ hollow thin-wall high piers includes first installing the outer formwork and inner formwork of the hollow thin-wall high pier, then installing the main bars and carrying out the installation of combined stirrups, and finally pouring concrete, and constructing section by section until the construction of the entire hollow thin-wall high pier is completed; its characteristics are:

[0005] The specific method for installing combined stirrups is as follows:

[0006] Step 1): Install the ground falsework

[0007] Design 4 groups of falsework modules on the original ground, including falsework A-1, A-2, B-1, B-2. Divide the stirrup cross-section of the hollow thin-wall high pier into a regular octagon, and divide the regular octagon into four quadrants through orthogonal cross-lines. Among them, the stirrup falsework in the second quadrant is A-1, and the stirrup falsework in the fourth quadrant is A-2; in order to realize the cross-installation form of the stirrups, rotate the stirrup falsework A-1 clockwise by 45° to get the B-1 falsework, and rotate the stirrup falsework A-2 counterclockwise by 45° to get the B-2 falsework; among them, the shape of the falsework is adapted to the formwork space of the hollow thin-wall high pier, and the shape of the hollow thin-wall high pier is restored in proportion according to the falsework A-1, A-2, B-1, B-2 for stirrup layout, constituting stirrup group A-1 module, A-2 module, B-1 module, B-2 module;

[0008] Step 2): Tie the stirrups well on the falsework according to the design requirements, and fix each group of stirrups with temporary bowl scaffolds; Step 3): Temporarily set the main bars of the hollow thin-wall high pier at an inclination angle of 5° to facilitate the subsequent insertion of the stirrup components, and then fix them with temporary hook bars;

[0009] Step 4): Use a crane to install the stirrup groups on the A-1 and A-2 frames and complete the stirrup binding at the intersection of the module steel bars. Then, use the building block method to hoist the stirrup groups on the B-1 and B-2 frames and complete the stirrup binding at the intersection of the module steel bars. The stirrup group A-1 module on the A-1 frame and the stirrup group B-1 module on the B-1 frame overlap at 45° in the height direction, and the stirrup group A-2 module on the A-2 frame and the stirrup group B-2 module on the B-2 frame overlap at 45° up and down; after the first upper and lower overlap is completed, the stirrup groups A-1 and A-2 modules are rotated 90° for hoisting and installation, and then the stirrup groups B-1 and B-2 modules are rotated 180° and installed in the same way as the building block method to achieve cross-lapping, and the above construction steps are repeated until the stirrups are installed within the length range of the main reinforcement of the hollow thin-walled high pier;

[0010] Step 5): Remove the temporary fixing hooks of the main reinforcement, connect the stirrups with the main reinforcement, remove the temporary bowl-mouth bracket, complete the installation of the complex stirrups of the hollow thin-walled high pier, and start pouring concrete.

[0011] When constructing the outer formwork and inner formwork layer by layer, construction preparation is carried out first. After the base of the hollow thin-walled high pier is poured, the outer formwork and inner formwork are installed on the base. The formwork is constructed in a flipping mold manner. First, the bottom layer of outer formwork and inner formwork are installed, and steel bar binding and stirrup construction are carried out. Finally, concrete is poured. When the concrete reaches the conditions for demolding, the next layer of outer formwork and inner formwork is demolded through the lifting platform, and the formwork is flipped, that is, hoisted to the upper construction position. The formwork construction is cyclically alternating until the construction reaches the pier top, and finally the formwork and working platform are removed.

[0012] The stirrup group on the A-1 and A-2 tire frames is in the form of a quarter of a regular octagon, which includes a rectangular stirrup and two end square stirrups. Reinforcing stirrups are arranged inside the rectangular stirrups, and the connection between the rectangular stirrups and the square stirrups is fixed by binding.

[0013] In view of the defects of existing thin-walled hollow piers, such as the difficulty in constructing complex stirrups, serious potential safety and quality risks, and a long construction period, the present invention directly sets a 1.5m high tire frame on the original ground, quickly binds the stirrups on the tire frame, and temporarily fixes the combined stirrups with a temporary bowl-mouth bracket, and hoisted them to the main stress-bearing reinforcement of the main pier in a "building block" manner. Only the intersection points of the combined stirrups at adjacent positions need to be installed, thereby achieving the purpose of rapid installation of complex stirrups, thereby reducing problems in construction period, safety, quality, etc., and effectively overcoming the factors affecting the surrounding environment.

[0014] The intelligent installation technology of complex combined stirrups for hollow thin-walled high piers is to set up a 1.5m high falsework on the original ground for the convenience of manual operation. On the falsework, the main reinforcement layout of the thin-walled hollow pier is restored according to a 1:1 ratio, the stirrups are quickly tied, and the combined stirrups are temporarily fixed with temporary cuplock supports. Then, they are hoisted onto the main pier's stressed main reinforcement in a "building block" manner, so as to achieve the purpose of quickly installing complex stirrups, thereby reducing problems in terms of construction period, safety, quality, etc., and effectively overcoming the influencing factors of the surrounding environment.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0016] The present invention can more effectively shorten the installation construction period, reduce safety risks, ensure the installation quality of the project, especially can overcome the installation difficulties brought by the height of the hollow thin-walled bridge pier and the influence of the surrounding environment.

[0017] Based on the characteristic that the thin-walled hollow pier often adopts a double-symmetrical layout, the present invention sets up two groups of four 1.5m high falseworks in the construction site, restores the main reinforcement layout of the thin-walled hollow pier according to a 1:1 ratio respectively, ties the stirrups on the falsework, and then temporarily fixes the combined stirrups with cuplock supports. After hoisting a group of stirrups with a crane, the stirrups at each module position are connected, and then the other group of stirrups is hoisted. After hoisting them in place in a "building block" form, the stirrups of each module are connected to achieve the purpose of quickly installing complex stirrups for the hollow thin-walled high pier, effectively shortening the installation construction period and ensuring the project quality.

[0018] The combined stirrups assembled, tied and temporarily fixed on the falsework are installed to the specified module of the hollow thin-walled high pier by a crane. Then, the modules of the hollow thin-walled high pier are connected, and in a "building block" manner, the purpose of quickly and high-quality installing the stirrups of the thin-walled high pier is achieved. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is: Schematic diagram of the combined stirrup module for the cast-in-situ hollow thin-walled high pier;

[0021] Figure 2 It is: Schematic diagram of steel bar tying on the falsework;

[0022] Figure 3 It is: Schematic diagram of stirrup installation; Detailed Embodiments

[0023] Through the following description of the embodiments, it will be more conducive to the public's understanding of the present invention. However, the specific embodiments given by the applicant should not be regarded as limitations on the technical solutions of the present invention. Any change in the definition of components or technical features, or a formal rather than substantial transformation of the overall structure should be regarded as the protection scope defined by the technical solutions of the present invention.

[0024] In this application, unless otherwise clearly specified or limited, terms such as "installation", "connection", "fixation", etc. 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 indirectly connected through an intermediate medium, or the communication inside two components, or only surface contact, or surface contact connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The present invention is implemented by the following technical solutions:

[0026] Embodiment 1:

[0027] A cast-in-place hollow thin-walled high pier combined stirrup installation method includes first installing the outer formwork and inner formwork of the hollow thin-walled high pier, then installing the main reinforcement and carrying out the combined stirrup installation, and finally pouring concrete, constructing section by section until the construction of the entire hollow thin-walled high pier is completed; its characteristics are:

[0028] The combined stirrup installation method is specifically as follows:

[0029] Step 1): Install the ground falsework

[0030] Design 4 groups of falsework on the original ground, including falsework A-1, A-2, B-1, B-2. Divide the stirrup section of the hollow thin-walled high pier into a regular octagon, and divide the regular octagon into four quadrants through orthogonal cross lines. Among them, the stirrup falsework in the second quadrant is A-1, and the stirrup falsework in the fourth quadrant is A-2; in order to achieve the cross installation form of the stirrups, rotate the stirrup falsework A-1 clockwise by 45° to get the B-1 falsework, and rotate the stirrup falsework A-2 counterclockwise by 45° to get the B-2 falsework; among them, the shape of the falsework is adapted to the formwork space of the hollow thin-walled high pier, and the shape of the hollow thin-walled high pier is restored in proportion according to the falsework A-1, A-2, B-1, B-2 for stirrup arrangement, forming stirrup group A-1 module, A-2 module, B-1 module, B-2 module;

[0031] Step 2): Tie the stirrups well on the falsework according to the design requirements, and fix each group of stirrups with temporary bowl scaffolds; Step 3): Temporarily set the main reinforcement of the hollow thin-walled high pier at an inclination angle of 5° to facilitate the subsequent insertion of the stirrup assembly, and then fix it with temporary hook bars.

[0032] Step 4): Use a crane to install the stirrup groups on the A-1 and A-2 formworks and complete the binding of stirrups at the intersection points of the module steel bars. Then, use the building block method to hoist the stirrup groups on the B-1 and B-2 formworks and complete the binding of stirrups at the intersection points of the module steel bars. Among them, the stirrup group of the A-1 module on the A-1 formwork and the stirrup group of the B-1 module on the B-1 formwork overlap at 45° in the height direction, and at the same time, the stirrup group of the A-2 module on the A-2 formwork and the stirrup group of the B-2 module on the B-2 formwork overlap at 45° vertically. After the first up-and-down lap is completed, rotate the stirrup groups of the A-1 and A-2 modules by 90° for hoisting and installation, and then rotate the stirrup groups of the B-1 and B-2 modules by 180°, and also use the building block method for installation to achieve cross-lapping. By repeating the above construction steps until the stirrups are installed within the length range of the main bars of the hollow thin-walled high pier;

[0033] Step 5): Remove the temporary fixing hook bars of the main bars, connect the stirrups and the main bars, and remove the temporary coupler scaffolds. The installation of the complex stirrups of the hollow thin-walled high pier is completed, and the concrete pouring begins.

[0034] When constructing the outer formwork and the inner formwork layer by layer, first carry out construction preparations. After the foundation of the hollow thin-walled high pier is poured, install the outer formwork and the inner formwork on the foundation, and carry out the construction according to the formwork turnover construction method. First, install the bottom-layer outer formwork and the inner formwork, carry out the steel bar binding and stirrup construction, and then pour the concrete. When the concrete reaches the formwork removal condition, remove the formwork of the next layer of the outer formwork and the inner formwork through the hoisting platform, and carry out formwork turnover, that is, hoist it to the upper-level construction position, and cycle and alternate the formwork construction until the pier top is constructed, and finally remove the formwork and the working platform.

[0035] The present invention provides another embodiment. The stirrup groups on the A-1 and A-2 formworks are in the form of one-fourth of a regular octagon, which includes a rectangular stirrup and two end square stirrups. Reinforcing stirrups are arranged inside the rectangular stirrup, and the connection between the rectangular stirrup and the square stirrup is fixed by binding, or the stirrups are fixed by welding.

[0036] The stirrup groups on the A-1 and A-2 formworks and the stirrup groups on the B-1 and B-2 formworks are cross-arranged in the vertical direction of the main bars, and the layout on the vertical plane can be A-1, A-2 - B-1, B-2, B-1, or A-1, A-2 - B-1, B-2, B-1 - A-1, A-2 - B-1, B-2, B-1, or A-1, A-2 - A-1, A-2 - B-1, B-2, B-1 - B-1, B-2, B-1, to achieve various layouts.

[0037] The formwork construction mainly includes:

[0038] 1. The formwork turning structure consists of components such as a construction platform, a formwork system, and auxiliary equipment.

[0039] 2. On the outside are 4 pieces of fixed steel formworks, which are internal formworks with chamfers. The internal formworks are divided into 4 pieces in total, and the chamfered parts are detachable. The inside and outside formworks are tightened with through-wall tie rods.

[0040] 3. Lifting equipment: mainly tower cranes and elevators, which are the main power equipment for transporting mechanical equipment, personnel, and materials.

[0041] 4. The technological process of formwork turning construction is as follows: construction preparation → steel bar binding → formwork turning assembly → concrete pouring → hoisting of the working platform → formwork lifting → construction to the top of the pier, formwork removal → working platform removal. During operation, operations such as formwork lifting, steel bar binding, concrete pouring, and hoisting of the platform are carried out cyclically.

[0042] Those skilled in the art should understand that those skilled in the art can achieve variation examples in combination with the prior art and the above embodiments, which will not be elaborated here. Such variation examples do not affect the essence of the present invention and will not be elaborated here.

[0043] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for installing combined stirrups of cast-in-situ hollow thin-walled high piers, which includes first installing the outer formwork and inner formwork of the hollow thin-walled high pier, then installing the main reinforcement and carrying out the installation of combined stirrups, and finally pouring concrete, and constructing section by section until the construction of the entire hollow thin-walled high pier is completed; its characteristics are as follows: The method for installing combined stirrups is specifically as follows: Step 1): Install the ground support Design 4 groups of supports on the original ground, including support A-1, A-2, B-1, B-2. Divide the stirrup section of the hollow thin-walled high pier into a regular octagon, and divide the regular octagon into four quadrants through orthogonal cross lines. Among them, the stirrup support in the second quadrant is A-1, and the stirrup support in the fourth quadrant is A-2; in order to achieve the cross-installation form of stirrups, rotate the stirrup support A-1 clockwise by 45° to get the B-1 support, and rotate the stirrup support A-2 counterclockwise by 45° to get the B-2 support; among them, the shape of the support is adapted to the formwork space of the hollow thin-walled high pier, and the shape of the hollow thin-walled high pier is restored proportionally according to supports A-1, A-2, B-1, B-2 for stirrup layout, forming a stirrup group; Step 2): Tie the stirrups on the support according to the design requirements, and fix each group of stirrups with temporary coupler supports; Step 3): Temporarily set the inclination angle of the main reinforcement of the hollow thin-walled high pier to 5° to facilitate the subsequent insertion of the stirrup components, and then fix it with temporary hooked bars; Step 4): Use a crane to install the stirrup groups on supports A-1 and A-2 and complete the binding of stirrups at the position of the module steel bar intersection points. Then, use the building block method to hoist the stirrup groups on supports B-1 and B-2 and complete the binding of stirrups at the position of the module steel bar intersection points. Among them, the stirrup group A-1 module on support A-1 and the stirrup group B-1 module on support B-1 overlap at 45° in the height direction. At the same time, the stirrup group A-2 module on support A-2 and the stirrup group B-2 module on support B-2 overlap at 45° up and down; when the first up and down lap joint is completed, rotate the stirrup groups A-1 and A-2 modules by 90° for hoisting installation, and then rotate the stirrup groups B-1 and B-2 modules by 180°, and also use the building block method for installation to achieve cross lap joint. By repeating the above construction steps until the stirrups are installed within the length range of the main reinforcement of the hollow thin-walled high pier; Step 5): Remove the temporary fixed hooked bars of the main reinforcement, connect the stirrups and the main reinforcement, and remove the temporary coupler supports. The installation of complex stirrups for the hollow thin-walled high pier is completed, and the concrete pouring begins.

2. The installation method of the combined stirrups for the cast-in-situ hollow thin-wall high pier according to claim 1, characterized in that: When constructing the outer formwork and inner formwork layer by layer, first carry out construction preparations. After pouring the foundation of the hollow thin-walled high pier, install the outer formwork and inner formwork on the foundation, and carry out the construction in the way of formwork turnover. First install the bottom layer of outer formwork and inner formwork, carry out steel bar binding and stirrup construction, and then pour concrete. When the concrete reaches the formwork removal condition, remove the formwork of the next layer of outer formwork and inner formwork through the hoisting platform, and carry out formwork turnover, that is, hoist it to the upper-level construction position, and cycle and alternate formwork construction until the pier top is constructed, and finally remove the formwork and the working platform.

3. A method for installing a combined stirrup for a cast-in-place hollow thin-walled high pier according to claim 1, characterized in that: The stirrup group on the A-1 and A-2 cradles is in the form of one-fourth of a regular octagon, which includes a rectangular stirrup and two end square stirrups. Reinforcing stirrups are arranged inside the rectangular stirrup, and the connection between the rectangular stirrup and the square stirrups is fixed by tying.

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