An inner operating platform of a thin-walled hollow high pier and a construction method thereof

Abstract

The present invention discloses an inner operating platform of a thin-walled hollow high pier and a construction method thereof, and belongs to the technical field of bridge construction. The inner operating platform includes a passage assembly, an upper flip platform and a lower flip platform, wherein the upper flip platform is connected to the upper end of the passage assembly, the lower flip platform is located below the upper flip platform, and the passage assembly is located on the inner side of the lower flip platform, and a plurality of stabilizing assemblies are provided on the outer side of the passage assembly. There is no need to pre-embed structural parts for installing the passage assembly, the upper flip platform, the lower flip platform and the stabilizing assembly on the pier body. The passage assembly and the lower flip platform do not extend out of the pier body, and have good stability, and a criss-cross top rod is arranged to constrain a banana-type ladder, so that operators can move up and down smoothly. Both the upper flip platform and the lower flip platform close the pier body in the transverse direction, which is convenient for tying steel bars and installing and disassembling flip formwork, which helps to improve construction efficiency and improves the safety of construction workers.

Description

Technical Field

[0001] The invention relates to an inner operating platform of a thin-wall hollow high pier and a construction method thereof, belonging to the technical field of bridge construction. Background Art

[0002] Thin-walled hollow piers have the advantages of thin thickness, light weight, good flexibility and low cost, and are widely used in high pier bridges on ordinary roads and highways. Since flip mold construction has the advantages of fast construction speed and easy control of appearance, thin-walled hollow high piers are generally constructed by flip mold construction. The template of flip mold construction is mainly pulled by tie rods. After each pouring, the template needs to be removed and reinstalled on one side. To facilitate construction, it is usually adopted to lay the construction platform by setting up a full-height bracket inside the pier, and use the full-height bracket to set up Z-shaped stairs for workers and management personnel to pass. However, the construction process of the full-height bracket and the construction platform is complicated, requiring a large number of steel pipes, occupying a large space, and having a high construction safety risk. The construction cost and material cost are high, which seriously affects the construction progress and construction cost of thin-walled hollow high piers.

[0003] A Chinese patent document with publication number CN108951429A discloses an internal frame for a hollow pier body and a method for constructing a hollow pier body using the internal frame for a hollow pier body. The method adopts an overall assembly construction method. On the one hand, the internal frame unit is used as a standard section. Compared with the traditional steel pipe frame, less material is used and the number of scaffolding workers is reduced. On the other hand, by directly using standard sections for assembly, the time for erecting the support is saved.

[0004] However, the built-in frame has the following shortcomings: 1. It is necessary to embed hook steel bars at the upper end of each pier body section for welding connection with the supporting rod at the lower end of the built-in frame. The embedding accuracy of the hook steel bars is high and the embedding control is difficult; 2. The lower end of the built-in frame is installed at the upper end of the pier body, and the built-in frame as a whole extends out of the pier body, resulting in poor stability; 3. There is a large gap between the built-in frame and the inner wall of the pier body, which is inconvenient for steel bar binding and formwork installation and disassembly construction, resulting in reduced construction efficiency. In addition, during the steel bar binding and formwork installation and disassembly construction process, there is a high risk of personnel falling from the gap between the built-in frame and the pier body. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an inner operating platform of a thin-walled hollow high pier and a construction method thereof.

[0006] The present invention is achieved through the following technical solutions:

[0007] An inner operating platform of a thin-walled hollow high pier comprises a passage assembly, an upper flip platform and a lower flip platform, wherein the upper flip platform is connected to the upper end of the passage assembly, the lower flip platform is located below the upper flip platform, and the passage assembly is located on the inner side of the lower flip platform, and a plurality of stabilizing assemblies are provided on the outer side of the passage assembly.

[0008] The upper flip platform is provided with a pedestrian passage at a position corresponding to the passage assembly.

[0009] The upper flip platform comprises a supporting frame, a supporting net and a surface supporting component, and the surface supporting component is connected to the supporting frame through the supporting net.

[0010] The support frame includes longitudinal steel trusses and transverse steel trusses, the transverse steel trusses are welded to the longitudinal steel trusses, the support mesh is a steel mesh, the steel mesh is welded to the transverse steel trusses, and the surface support assembly includes connecting square timbers tied to the steel mesh and bamboo plywood laid on the connecting square timbers.

[0011] The passage assembly comprises a banana-type ladder, the upper end of which is connected to the upper flip platform via a pedestrian ladder.

[0012] The outer side of the banana-type ladder is provided with a plurality of stabilizing components at equal intervals below the lower flip platform, and the intervals between the plurality of stabilizing components are 4 to 6 meters.

[0013] The stabilizing component comprises four top rods arranged in a tic-tac-toe shape, and the staggered positions of the four top rods are connected by cross fasteners.

[0014] The lower flip platform comprises a top frame and a bamboo plywood. The top frame comprises a plurality of top rods arranged in a crisscross pattern. The staggered positions of the plurality of top rods are connected by cross fasteners. The bamboo plywood is connected to the top frame by connecting square timbers.

[0015] A construction method for an inner operating platform of a thin-walled hollow high pier, the construction method comprising the following steps:

[0016] A. Set up a banana ladder on the pier foundation, and set up a lower flip platform on the outside of the banana ladder. The lower flip platform is placed on the pier foundation. The steel bar binding and flip formwork installation work of the first section of the pier body are completed in sequence. The upper flip platform is hoisted to the upper end of the inner formwork in the flip formwork and fixed to complete the concrete pouring work of the first section of the pier body.

[0017] B. After the reinforcement binding work of the next section of the pier is completed on the upper flip platform, the upper flip platform is lifted off the flip formwork using a tower crane.

[0018] C. Complete the lifting work of the mold template and install it in place.

[0019] D. Use the tower crane to move the lower flip platform as a whole to a position close to the lower end of the flip formwork, and make the jacking rods in the lower flip platform press against the inner wall of the pier body.

[0020] E. Raise the height of the banana ladder so that the upper end of the banana ladder extends into the middle of the flip formwork, install a stabilizing assembly on the outside of the banana ladder, and make the top rod in the stabilizing assembly press against the inner wall of the pier body.

[0021] F. Use the tower crane again to lift the upper flip platform to the upper end of the inner formwork, install and fix it, and connect the upper flip platform and the banana ladder through a pedestrian ladder.

[0022] G. Debug, calibrate and tighten the flip formwork, and complete the concrete pouring of the next section of the pier;

[0023] H. Repeat steps B to G to complete the concrete pouring of the pier section by section.

[0024] The shapes and sizes of the upper and lower flip platforms match the lateral shapes and sizes of the pier body. Before the pier body is capped, the upper flip platform is lifted off the pier body by a tower crane, and the lower flip platform is lifted to the outside of the pier body, and then the banana ladder and the stabilizing components are gradually and safely removed from top to bottom.

[0025] The beneficial effects of the present invention are:

[0026] 1. It is not necessary to pre-embed structural parts for installing passage components, upper flip platform, lower flip platform and stable components on the pier body.

[0027] 2. The passage components and the lower flip platform do not extend out of the pier body, so they have good stability. In addition, a criss-cross top rod is arranged to restrain the banana-type ladder, so that workers can move up and down smoothly.

[0028] 3. Both the upper and lower turning platforms are closed in the transverse direction of the pier body, which is convenient for tying steel bars and installing and removing the turning formwork, helping to improve construction efficiency while improving the safety of construction workers.

[0029] 4. The upper and lower flip platforms are designed to be light and simple. They can be moved freely up and down by tower crane and can be installed quickly.

[0030] 5. It overcomes the defects of setting up traditional full-bridge scaffolding in hollow high piers, such as complex process, small operating space, high construction safety risk and high economic cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along Ⅰ-Ⅰ;

[0033] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along III-III;

[0034] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along II-II;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along IV-IV;

[0036] Figure 6 for Figure 5 A partial enlarged schematic diagram at point Ⅰ.

[0037] In the figure: 1-transverse steel truss, 2-longitudinal steel truss, 3-steel mesh, 4-connecting square timber, 5-inner formwork, 6-pedestrian passage, 7-pier body, 8-banana ladder, 9-top rod, 90-round tube, 91-top screw, 10-bamboo plywood, 11-pedestrian ladder. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0039] like Figures 1 to 6 As shown, the inner operating platform of a thin-walled hollow high pier described in the present invention includes a passage assembly, an upper flip platform and a lower flip platform, wherein the upper flip platform is connected to the upper end of the passage assembly, the lower flip platform is located below the upper flip platform, and the passage assembly is located on the inner side of the lower flip platform, and a plurality of stabilizing components are installed on the outer side of the passage assembly. When in use, there is no need to pre-embed structural parts for installing the passage assembly, the upper flip platform, the lower flip platform and the stabilizing components on the pier body 7; the passage assembly and the lower flip platform do not extend out of the pier body 7, and have good stability, and the stabilizing components are arranged to improve the stability of the passage assembly; the upper flip platform and the lower flip platform both close the pier body 7 in the transverse direction, which is convenient for tying steel bars and installing and removing flip formwork, which helps to improve construction efficiency and at the same time improves the safety of construction workers.

[0040] The upper flip platform is provided with a pedestrian passage 6 at a position corresponding to the passage assembly. When in use, a sealing door is hinged on the upper flip platform at the position of the pedestrian passage 6, and the sealing door is used to close the pedestrian passage 6 to prevent construction workers from falling from the pedestrian passage 6.

[0041] The upper flip platform comprises a supporting frame, a supporting net and a surface supporting component, and the surface supporting component is connected to the supporting frame through the supporting net.

[0042] The support frame includes a longitudinal steel truss 2 and a transverse steel truss 1, the transverse steel truss 1 is welded to the longitudinal steel truss 2, the support mesh is a steel mesh 3, the steel mesh 3 is welded to the transverse steel truss 1, and the surface support assembly includes a connecting square wood 4 tied to the steel mesh 3, and a bamboo plywood 10 laid on the connecting square wood 4. When in use, the transverse steel truss 1 and the longitudinal steel truss 2 are made of channel steel of q235 material. The steel mesh 3 is welded and connected to the longitudinal steel truss 2 and the transverse steel truss 1 using φ20 round steel. The transverse size of the connecting square wood 4 is 10cm×10cm. The thickness of the bamboo plywood 10 is 20mm.

[0043] The passage assembly comprises a banana ladder 8, the upper end of which is connected to the upper flip platform via a pedestrian ladder 11. When in use, the pedestrian ladder 11 is made by welding double-joined channel steel.

[0044] The outside of the banana ladder 8 is equidistantly provided with several stabilizing components below the lower flipping platform, and the spacing between the several stabilizing components is 4 to 6 meters. When in use, the spacing between the stabilizing components is 5 meters.

[0045] The stabilizing assembly includes four top rods 9 arranged in a tic-tac-toe pattern, and the staggered positions of the four top rods 9 are connected using cross fasteners. Figure 6 As shown, when in use, the jack rod 9 comprises a round tube 90, and both ends of the round tube 90 are threadedly connected with jack screws 91. The outer diameter of the round tube 90 is φ48 mm, and the wall thickness is 5 mm.

[0046] The lower flip platform includes a top frame and a bamboo plywood 10. The top frame includes a plurality of top rods 9 arranged in a crisscross pattern. The staggered positions of the plurality of top rods 9 are connected using cross fasteners. The bamboo plywood 10 is connected to the top frame by connecting square timbers 4.

[0047] A construction method for an inner operating platform of a thin-walled hollow high pier, the construction method comprising the following steps:

[0048] A. Set up a banana ladder 8 on the pier foundation, and set up a lower flip platform on the outside of the banana ladder 8. The lower flip platform is placed on the pier foundation. The steel bar binding and flip formwork installation of the first section pier body 7 are completed in sequence. The upper flip platform is hoisted to the upper end of the inner formwork 5 in the flip formwork and fixed to complete the concrete pouring of the first section pier body 7. When in use, the upper flip platform can be connected to the inner formwork 5 with fasteners such as bolts, nuts, and washers. A banana ladder avoidance is reserved in the middle of the lower flip platform.

[0049] B. After the steel bar binding work of the next section of the pier 7 is completed on the upper flip platform, the upper flip platform is lifted away from the flip formwork using a tower crane. Before binding the steel bars of the next section of the pier 7, a steel bar cage can be hoisted at the upper end of the outer formwork to ensure the safe construction of the steel bar binding.

[0050] C. Complete the flipping work of the mold template and install it in place.

[0051] D. Move the lower flip platform as a whole to a position close to the lower end of the flip formwork by the tower crane, and make the push rod 9 in the lower flip platform press against the inner wall of the pier body 7. When in use, the lower flip platform and the banana ladder 8 can be connected by wire tying to improve the stability and reliability of the lower flip platform.

[0052] E. Raise the height of the banana ladder 8 so that the upper end of the banana ladder 8 extends into the middle of the flip formwork, install the stabilizing assembly on the outside of the banana ladder 8, and make the top rod 9 in the stabilizing assembly press against the inner wall of the pier body 7. When in use, the stabilizing assembly and the banana ladder 8 can be connected by steel wire tying to improve the stability and reliability of the stabilizing assembly.

[0053] F. Use the tower crane again to lift the upper flip platform to the upper end of the inner template 5, and install and fix it, and connect the upper flip platform and the banana ladder 8 through the pedestrian ladder 11.

[0054] G. Debug, calibrate and tighten the flip formwork, and complete the concrete pouring of the next section of the pier 7;

[0055] H. Repeat steps B to G to complete the concrete pouring of the pier body 7 section by section.

[0056] The shapes and sizes of the upper and lower flip platforms match the lateral shapes and sizes of the pier body 7. Before the pier body 7 is capped, the upper flip platform is lifted off the pier body 7 by a tower crane, and the lower flip platform is lifted to the outside of the pier body 7, and then the banana ladder 8 and the stabilizing components are gradually and safely removed from top to bottom.

[0057] Compared with the prior art, the inner operating platform of the thin-walled hollow high pier and the construction method thereof provided by the present invention have the following beneficial effects:

[0058] 1. It is not necessary to pre-embed structural parts for installing the passage assembly, the upper flip platform, the lower flip platform and the stabilizing assembly on the pier body 7.

[0059] 2. The passage assembly and the lower flip platform do not extend out of the pier body 7, and have good stability. The crisscross-shaped top rods 9 are arranged to constrain the banana-type ladder 8, so that the workers can pass up and down smoothly.

[0060] 3. The upper turning platform and the lower turning platform both close the pier body 7 in the transverse direction, which is convenient for tying steel bars and installing and removing the turning formwork, helping to improve construction efficiency and at the same time improving the safety of construction workers.

[0061] 4. The upper and lower flip platforms are designed to be light and simple. They can be moved freely up and down by tower crane and can be installed quickly.

[0062] 5. It overcomes the defects of setting up traditional full-bridge scaffolding in hollow high piers, such as complex process, small operating space, high construction safety risk and high economic cost.

Claims

1. An inner operating platform of a thin-walled hollow high pier, characterized in that: It includes a passage assembly, an upper flip platform and a lower flip platform, wherein the upper flip platform is connected to the upper end of the passage assembly, the lower flip platform is located below the upper flip platform, and the passage assembly is located on the inner side of the lower flip platform, and a plurality of stabilizing assemblies are provided on the outer side of the passage assembly; The upper flip platform includes a support frame, a support net and a surface support component, and the surface support component is connected to the support frame through the support net; The support frame comprises a longitudinal steel truss (2) and a transverse steel truss (1), wherein the transverse steel truss (1) is welded to the longitudinal steel truss (2); the support mesh is a steel mesh (3), wherein the steel mesh (3) is welded to the transverse steel truss (1); the surface support assembly comprises a connecting square timber (4) tied to the steel mesh (3), and a bamboo plywood (10) laid on the connecting square timber (4); The lower turning platform comprises a top frame and a bamboo plywood (10), the top frame comprising a plurality of top rods (9) arranged in a crisscross pattern, the staggered positions of the plurality of top rods (9) being connected using cross fasteners, and the bamboo plywood (10) being connected to the top frame via connecting square timbers (4).

2. The inner operating platform of the thin-walled hollow high pier according to claim 1, characterized in that: A pedestrian passage (6) is provided on the upper flip platform at a position corresponding to the passage assembly.

3. The inner operating platform of the thin-walled hollow high pier according to claim 1, characterized in that: The passage assembly comprises a banana-type ladder (8), the upper end of which is connected to the upper flip platform via a pedestrian ladder (11).

4. The inner operating platform of the thin-walled hollow high pier as claimed in claim 3, characterized in that: The outer side of the banana-type ladder (8) is provided with a plurality of stabilizing components at equal intervals below the lower flip platform, and the spacing between the plurality of stabilizing components is 4 to 6 meters.

5. The inner operating platform of the thin-walled hollow high pier as claimed in claim 3, characterized in that: The stabilizing assembly comprises four top rods (9) arranged in a tic-tac-toe pattern, and the staggered positions of the four top rods (9) are connected using cross fasteners.

6. A construction method for the inner operating platform of a thin-walled hollow high pier as claimed in claim 5, characterized in that: The construction method comprises the following steps: A. A banana-type ladder (8) is set up on the pier foundation, and a lower turning platform is set up on the outer side of the banana-type ladder (8). The lower turning platform is placed on the pier foundation, and the steel bar binding and the turning formwork installation work of the first section of the pier body (7) are completed in sequence. The upper turning platform is hoisted to the upper end of the inner formwork (5) in the turning formwork and fixed, and the concrete pouring work of the first section of the pier body (7) is completed; B. After the reinforcement work of the lower pier body (7) is completed on the upper turning platform, the upper turning platform is lifted off the turning formwork using a tower crane; C. Complete the lifting work of the mold template and install it in place; D. Use a tower crane to move the lower flip platform as a whole to a position close to the lower end of the flip formwork, and make the push rod (9) in the lower flip platform press against the inner wall of the pier body (7); E. Raise the height of the banana ladder (8) so that the upper end of the banana ladder (8) extends into the middle of the flip formwork, install a stabilizing assembly on the outer side of the banana ladder (8), and make the top rod (9) in the stabilizing assembly press against the inner wall of the pier body (7); F. Use the tower crane again to lift the upper flip platform to the upper end of the inner formwork (5), install and fix it, and connect the upper flip platform and the banana ladder (8) through the pedestrian ladder (11); G. Debug, calibrate and tighten the flip formwork, and complete the concrete pouring of the next section of the pier (7); H. Repeat steps B to G to complete the concrete pouring of the pier body (7) section by section.

7. The construction method of the inner operating platform of the thin-walled hollow high pier according to claim 6, characterized in that: The shapes and sizes of the upper and lower turning platforms match the transverse shapes and sizes of the pier body (7); before the pier body (7) is capped, the upper turning platform is lifted off the pier body (7) by a tower crane, and the lower turning platform is lifted to the outside of the pier body (7), and then the banana ladder (8) and the stabilizing components are gradually and safely removed from top to bottom.

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