Formwork removal method for bridge pier column formwork turnover construction

Abstract

The invention relates to the field of piers for bridges, in particular to a form removal method for bridge pier column form turnover construction. The form removal method for bridge pier column form turnover construction is characterized by comprising the following steps that S1, a formwork is arranged; s2, setting a platform; s3, the suspender is machined; s4, processing the separation device; s5, suspenders are installed; s6, a separation device is installed; s7, separating; and S8, construction is conducted. The method is safe, reliable and convenient to construct.

Description

Technical Field

[0001] The invention relates to the field of bridge piers, and in particular to a demolding method for bridge pier column overmoulding construction. Background Art

[0002] In the field of high pier construction of bridges, the traditional formwork construction method is still widely used. Due to the simple process, the construction formwork involved does not require additional auxiliary equipment. The manual operation platform outside the formwork utilizes a triangular support platform hung on the outside of the formwork and connected to it. The triangular support platform is connected to the formwork as a whole and can be dismantled as a whole.

[0003] Traditional mold turning formwork generally has three or more layers, and the manual working platform on each layer has only one outer triangular supporting platform at the upper end of the formwork. When this layer of formwork is at the lowest layer, when removing the formwork, manual work needs to stand in a hanging basket and use a tower crane or a car crane to hold the hanging basket and remove the tie rods, bolts or other connectors around the formwork to separate the formwork. The operation itself is relatively dangerous, and it is difficult for one person to operate at high altitude while standing in the hanging basket, and the work efficiency is low.

[0004] Then use a tower crane to lift this layer of formwork and lift it outward and upward. Since the center of gravity of the formwork is inward, at the moment the tower crane wire rope is separated from the formwork, the wire rope straightens under the force, causing the formwork to suddenly swing outward, which is very dangerous. Summary of the invention

[0005] In order to overcome the defects of the prior art and provide a safe, reliable and easy-to-construct bridge pier construction method, the present invention discloses a demoulding method for bridge pier column turnover construction.

[0006] The present invention achieves the purpose of the invention through the following technical solutions: A method for removing molds for bridge pier remodeling construction is characterized by: performing the following steps in sequence: S1: Formwork: The formwork has at least three layers. Each layer of the formwork has an external triangular support platform on the upper and lower sides, which serves as a working platform for construction workers. There is a safety net on the outside of the platform. S2: Set up the platform: The triangular support platform is connected to the formwork as a whole, and the triangular support platform is composed of a lower triangular support platform horizontal beam at the bottom and an upper triangular support platform horizontal beam at the top, which are connected and fixed by a diagonal bracing beam in the middle; Wooden boards are laid on the horizontal beams of the triangular support platform to form a working platform; S3: Processing the suspension rod: Use channel steel to process a U-shaped suspension rod device, the upper end of which is connected to the rolling wheel with bolts and nuts, and is hung on the horizontal beam of the upper template triangular support platform, and the lower end directly holds the I-beam horizontal beam of the lower template triangular support platform; S4: Processing and separation device: The template separation device is formed by using a tensioner and a wire rope. The upper end of the wire rope is connected to the belt of the upper template, and the lower end is connected to the belt of the lower template. The front steering wheel is used to turn, and the tensioner is manually operated to pull the lower template outward at a uniform speed; S5: Install the suspension rod: When the bottom layer of formwork is removed, first install the suspension rod device, the rolling wheel at the upper end of the suspension rod is stuck in the upper horizontal beam, and the lower end holds the lower horizontal beam; The operator still stands on the triangular working platform of the lower template to remove all the tie rods and bolts of the template and separate the lowest template. At this time, the template is hung on the horizontal beam of the triangular supporting platform of the upper template by the hanging rod under the action of its own weight; S6: Install the separation device: The wire rope is wound around the belts of the upper and lower templates, and the steering is made by the steering wheel of the front triangular support platform; The operator stands on the lower triangular working platform of the upper template and operates the tensioner to tighten the wire rope. The lower template is pulled out at a uniform speed under the force of the wire rope. S7: Separation: When the formwork is moved out a sufficient distance, use a lifting machine to lift the formwork and tighten it slightly; Continue to move the template outward until the template is completely separated from the upper template; the wire rope wrapped around the lower layer is detached from the tensioner; S8: Construction: Lift the formwork to the top of the pier and carry out normal formwork construction.

[0007] The demolding method for bridge pier re-moulding construction is characterized in that: in step S1, the lower triangular support platform horizontal beam and the upper triangular support platform horizontal beam in the triangular support platform are both made of I-beams, and the diagonal support beam is made of channel steel or I-beams, and the length of the lower triangular support platform horizontal beam is shorter than that of the upper triangular support platform horizontal beam to avoid conflicts in the plane position of the enclosure structure of the multi-layer formwork.

[0008] The demoulding method for bridge pier re-moulding construction is characterized in that: in step S3, the suspension rod device is formed by processing channel steel.

[0009] The demoulding method for bridge pier re-moulding construction is characterized in that: in step S5, at least three suspension rod devices are installed at each location on the bottom layer of the template.

[0010] The demoulding method for bridge pier re-moulding construction is characterized in that: in step S7, the lifting machinery is a tower crane or a truck crane.

[0011] The invention provides a novel formwork removal method, which solves the problems of high danger and difficulty in manual formwork removal in the formwork reversal construction of ordinary bridge piers.

[0012] The present invention has the following beneficial effects: It can be well implemented and operated. The operators work in the triangular support platform of the template and the surrounding protective structure throughout the process, which is safer. In addition, multiple people can perform dismantling operations at the same time, which is more efficient. The template removal and outward movement are relatively smooth and uniform, and the height operation is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the mold removal steps in the present invention, Figure 2 This is a large-scale diagram of the template separation device node in the present invention. Figure 3 It is a large-scale drawing of the nodes of the suspension rod device in the present invention.

[0014] The component names corresponding to the reference numerals are as follows: 1: Re-moulding template, 2: Horizontal beam of lower triangular support platform, 3: Upper and lower triangle support platform inclined beams, 4: Horizontal beam of upper triangular support platform, 5: Formwork belt (or horizontal stiffening beam), 6: The outer enclosure net of the template (enclosed space to protect the safety of workers), 7: boom device, 8: Bridge pier, 9: Wire tensioner, 10: Front steering wheel, 11: Demolding wire rope, 12: Tower crane or truck crane wire rope, 13: Steel suspender rod, 14: scroll wheel, 15: Nut, 16: Bolts. DETAILED DESCRIPTION

[0015] The present invention is further described below by means of specific examples. Example

[0016] A method for removing the formwork for bridge pier remodeling construction, such as Figure 1 to Figure 3 As shown, follow the steps below: S1: Formwork: The mold-turning formwork 1 has at least three layers, and each layer of the formwork has an external triangular support platform on the upper and lower sides, which serves as a working platform for construction workers. There is a safety net 6 on the outside of the platform; S2: Set up a platform: The triangular support platform is connected to the template as a whole, and the triangular support platform is composed of a lower triangular support platform horizontal beam 2 at the bottom and an upper triangular support platform horizontal beam 4 at the top, which are connected and fixed by a middle diagonal support beam 3; The lower triangular support platform horizontal beam 2 and the upper triangular support platform horizontal beam 4 in the triangular support platform are both made of I-beams, and the diagonal support beam 3 is made of channel steel or I-beams; The length of the lower triangular support platform horizontal beam 2 is shorter than the length of the upper triangular support platform horizontal beam 4 in order to avoid the conflict of the surrounding structure of the multi-layer formwork in the plane position; Wooden boards are laid on the horizontal beams of the triangular support platform to form a working platform (the wooden boards are not shown in the figure); S3: Processing the suspension rod: Use the channel steel 13 to process and form a U-shaped suspension rod device 7, the upper end of which is connected to the rolling wheel 14 by bolts 16 and nuts 15, and is hung on the horizontal beam 4 of the upper template triangular support platform, and the lower end directly holds the I-beam horizontal beam 2 of the lower template triangular support platform. The main function of the suspension rod device 7 is to serve as a bearing structure to hang the lower template on the upper template; S4: Processing and separating device: The template separation device 7 is formed by using the tensioner 9 and the wire rope 11. The upper end of the wire rope is connected to the belt 5 of the upper template, and the lower end is connected to the belt 5 of the lower template. The front steering wheel 10 is used to turn, and the lower template is pulled out at a uniform speed by manual operation of the tensioner; S5: Install the suspension rod: When the bottom template 1 is removed, first install the suspension rod device 7. At least three suspension rod devices 7 are installed at each location on the bottom template 1. The rolling wheel 14 at the upper end of the suspension rod is stuck in the upper horizontal beam 4, and the lower end holds the lower horizontal beam 2. The operator still stands on the triangular working platform of the lower template to remove all the tie rods and bolts of the template and separate the bottom template. At this time, the template is suspended in the horizontal beam of the triangular supporting platform of the upper template by the suspension rod 7 under the action of its own weight; S6: Install the separation device: The steel wire rope 11 is wound around the belts of the upper and lower templates, and the steering is made by using the steering wheel 10 of the front triangular support platform; The operator stands on the lower triangular working platform of the upper template and operates the tensioner 9 to tighten the wire rope 11. The lower template is pulled outward at a uniform speed under the force of the wire rope. S7: Separation: When the template 1 is moved outwards a sufficient distance, the template 1 is suspended by a tower crane or a car crane wire rope 12 and slightly tightened; Continue to move the template outward until the template is completely separated from the upper template; the wire rope 11 wound around the lower layer is separated from the tensioner; S8: Construction: Lift the formwork to the upper end of pier 8 and carry out normal formwork construction.

Claims

1. A method for removing molds for bridge pier remodeling construction, characterized by: Follow the steps below to implement: S1: Formwork installation: The mold-turning formwork (1) has at least three layers, and each layer of the formwork has an external triangular support platform on the upper and lower sides, which serves as a working platform for construction workers. There is a safety net (6) on the outside of the platform; S2: Setting a platform: The triangular support platform is connected to the template as a whole, and the triangular support platform is composed of a lower triangular support platform horizontal beam (2) and an upper triangular support platform horizontal beam (4) connected and fixed by a middle diagonal support beam (3); Wooden boards are laid on the horizontal beams of the triangular support platform to form a working platform; S3: Processing the suspension rod: A U-shaped suspension rod device (7) is formed by processing the channel steel (13), the upper end of which is connected to the rolling wheel (14) by means of bolts (16) and nuts (15), and is hung on the horizontal beam (4) of the upper template triangular support platform, and the lower end directly holds the I-beam horizontal beam (2) of the lower template triangular support platform; S4: Processing and separating device: A template separation device (7) is formed by using a tensioner (9) and a steel wire rope (11), the upper end of the steel wire rope is connected to the belt (5) of the upper template, and the lower end is connected to the belt (5) of the lower template. The front steering wheel (10) is used to turn, and the tensioner is manually operated to pull the lower template outward at a uniform speed; S5: Installing the suspension rod: When the bottom layer of the formwork (1) is removed, first install the suspension rod device (7), the rolling wheel (14) at the upper end of the suspension rod is stuck in the upper layer horizontal beam (4), and the lower end holds the lower layer horizontal beam (2); The operator still stands on the triangular working platform of the lower template to remove all the tie rods and bolts of the template and separate the lowermost template. At this time, the template is suspended in the horizontal beam of the triangular supporting platform of the upper template by the suspension rod (7) under the action of its own weight; S6: Installing the separation device: The steel wire rope (11) is wound around the belts of the upper and lower templates, and the steering is performed using the steering wheel (10) of the front triangular support platform; The operator stands on the lower triangular working platform of the upper template and operates the tensioner (9) to tighten the wire rope (11), and the lower template is pulled outward at a uniform speed under the force of the wire rope; S7: Separation: When the template (1) is moved outward a sufficient distance, the template (1) is lifted by a lifting machine and slightly tightened; Continue to move the template outward until the template is completely separated from the upper template; the steel wire rope (11) wound around the lower layer is separated from the tensioner; S8: Construction: Lift the formwork to the upper end of the bridge pier (8) and carry out normal formwork construction.

2. The demoulding method for bridge pier remodeling construction according to claim 1 is characterized by: In step S2, the lower triangular support platform horizontal beam (2) and the upper triangular support platform horizontal beam (4) in the triangular support platform are both made of I-beams, and the diagonal support beam (3) is made of channel steel or I-beams, and the length of the lower triangular support platform horizontal beam (2) is shorter than the length of the upper triangular support platform horizontal beam (4).

3. The demoulding method for bridge pier remodeling construction as claimed in claim 2 is characterized by: In step S3, the suspension rod device (7) is formed by processing the channel steel (13).

4. The demoulding method for bridge pier remodeling construction as claimed in claim 3 is characterized by: In step S5, at least three suspension rod devices (7) are installed at each location on the bottom layer template (1).

5. The demoulding method for bridge pier remodeling construction according to claim 4 is characterized by: In step S7, the lifting machinery is a tower crane or a truck crane.

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