Lower cross beam support structure serving as lower tower column construction platform and construction method of lower cross beam support structure

Abstract

The invention discloses a lower cross beam support structure serving as a lower tower column construction platform and a construction method, and the lower cross beam support structure comprises a steel pipe support, an inner side profile steel distribution beam, an outer side profile steel distribution beam, an inner side steel truss, an outer side steel truss, a stand column embedded part, a bracket, a sand cylinder, an opposite-pulling system and an attached construction platform, a floor type steel pipe support and steel truss form is adopted, an attached construction platform is attached to the steel pipe support through a hoop, lower tower column construction and lower beam support structure erection are conducted synchronously, lifting of the platform is controlled by adjusting the attaching position of the hoop, and the horizontal operation position of the platform is adjusted through a telescopic rod. Therefore, the lower cross beam support structure is integrated and multipurpose, the high-altitude operation time for installing an attached construction platform is shortened, the construction efficiency of a main tower is improved, the construction cost is reduced, the safety guarantee of construction of a lower tower column and a lower cross beam is improved, the problems that the construction period of the lower cross beam is long, and high-altitude operation is much are solved, and integration and multiple purposes of the lower cross beam support are achieved. And particularly, a direction is provided for the future construction process selection of the lower cross beam of the high tower.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a lower crossbeam support structure also serving as a lower tower column construction platform and a construction method thereof. Background Art

[0002] During the construction of the main tower of a large bridge, the lower crossbeam is a key part supporting the main beam, and its construction is extremely important. The traditional lower crossbeam support structure usually uses steel pipes or steel frames as the main support, but it can only be erected after the lower tower column is constructed. The construction period is long and the material consumption is large, which makes it difficult to meet the requirements of modern construction with high efficiency and environmental protection. At the same time, the traditional lower tower column construction platform structure often adopts climbing formwork (turnover formwork) construction or sets up a construction platform support separately. When the former is constructed to the lower crossbeam, a lot of work such as temporary disassembly and storage of the climbing formwork (turnover formwork) is required. After the construction of the lower crossbeam is completed, it needs to be reassembled when constructing the segmental tower column above the lower crossbeam. The above large amount of additional work for the climbing formwork (turnover formwork) seriously affects the construction progress, further extending the construction period of the lower crossbeam; the latter platform support needs to take into account both support stability and construction convenience. It is often attached to the tower column through structures such as climbing cones. It needs to be disassembled repeatedly during construction, and a large number of pre-buried on the tower column are required. There is both material waste and a large amount of high-altitude operations, making construction safety and construction costs difficult to control. Summary of the invention

[0003] The first purpose of the present invention is to provide a lower crossbeam support structure that also serves as a lower tower column construction platform. By optimizing the support design, the lower crossbeam support structure can be integrated and multi-purpose, reducing costs, reducing high-altitude operations for installing construction platforms, and improving construction safety.

[0004] The second object of the present invention is to provide a construction method for a lower crossbeam support structure that also serves as a lower tower column construction platform, to achieve synchronous and efficient construction of the lower crossbeam support and the lower tower column, and to achieve synchronous binding of the lower crossbeam steel bars and the lower tower column last section steel bars, which can greatly improve construction efficiency and shorten construction period.

[0005] The first object of the present invention is achieved by: A lower crossbeam support structure which also serves as a lower tower column construction platform, characterized in that it includes a steel pipe support, an inner steel distribution beam, an outer steel distribution beam, an inner steel truss, an outer steel truss, column embedded parts, a corbel, a sand cylinder and a tensioning system, wherein the first attached wall is fixed to the outer walls on both sides of the second segment of the lower tower column, the second attached wall is fixed to the outer walls on both sides of the fourth segment of the lower tower column, and the third attached wall is fixed to the outer walls on both sides of the sixth segment of the lower tower column; the tower column support is arranged above the middle of the main tower pedestal, and steel pipe supports are arranged in the middle of two opposite lower tower columns, on the outside of each lower tower column, on the top of the main tower base, and on the top of the main tower pedestal; each set of steel pipe supports is composed of steel pipe columns, a connection system and a flange plate, and the steel pipe columns are divided into sections. Flange connection is adopted, and the bottom ends of all steel pipe supports are connected and fixed to the main tower pedestal and tower base with column embedded parts. The steel pipe columns are connected and fixed to the lower tower columns through the first wall attachment, the second wall attachment, and the third wall attachment to ensure the stability of the steel pipe supports; the corbel is attached to the side wall outside the seventh segment of the lower tower column, and sand cylinders, outer steel distribution beams and outer steel trusses are installed on the top of the corbel and the top of the outer steel pipe columns from bottom to top. The tension system that crosses the seventh segment of the lower tower column fixes the outer steel truss to the seventh segment of the lower tower column, and the inner steel distribution beam and inner steel truss, outer steel distribution beam, outer steel truss and bottom formwork system are installed on the top of the steel pipe support from bottom to top to support the casting of the lower crossbeam.

[0006] Furthermore, the lower crossbeam support structure also includes an attached construction platform, which is attached to the steel pipe column through a clamp, and an adjustable length telescopic rod is welded on the clamp. The upper and lower telescopic rods are connected to form a truss structure through a platform connection system, and the platform panels and guardrails that are perpendicular to each other and in an "L" shape are installed on the upper edge of the telescopic rod. The lifting and lowering of the attached construction platform is controlled by adjusting the attachment position of the clamp, and the horizontal working position of the attached construction platform is adjusted by adjusting the length of the telescopic rod.

[0007] The second object of the present invention is achieved by: A construction method for a lower crossbeam support structure also serving as a lower tower column construction platform, characterized in that the construction steps are as follows: A. Construct the main tower cap, main tower base, first section and second section of the lower tower column, and embed the column embedded parts in time during this process; B. After the construction of the second section of the lower tower column is completed, install the part below the flange of the steel pipe support beside the second section of the lower tower column, on the main tower base and the main tower cap, connect the first attached wall, and install an attached construction platform on the steel pipe column of the steel pipe support, and use the attached construction platform to construct the third section of the lower tower column; C. After the third section of the lower tower column is constructed, the attached construction platform is lifted to construct the fourth section of the lower tower column. When the fourth section of the lower tower column is constructed, the embedded parts of the second attached wall attached to the lower tower column are buried, and the second attached wall is installed in time after the fourth section of the lower tower column is constructed; D. After the fifth section of the lower tower column is cast, install the part above the flange of the steel pipe support, and use the flange to connect the two parts into a whole, continue to lift the attached construction platform, and use the clamp to attach the attached construction platform to the steel pipe column of the steel pipe support part above the flange, use the attached construction platform to construct the sixth section of the lower tower column, and embed the embedded parts of the third wall on the sixth section. After the construction of the sixth section of the lower tower column is completed, install the third wall, the inner steel distribution beam, and the inner steel truss; E. Lift the attached construction platform, install the bottom formwork system on the top of the inner steel truss, and simultaneously tie the steel bars of the seventh segment of the lower tower column and the steel bars of the lower crossbeam on the top of the inner steel truss. After the construction is completed, cast the seventh segment, and bury the embedded part of the corbel and the embedded pipe of the tension system on the outer wall of the seventh segment; F. After the seventh section is completed, the bracket, sand cylinder, outer steel distribution beam, tension system and outer steel truss are installed in sequence; G. Install the formwork system on the top of the outer steel truss and tie the remaining steel bars of the lower beam; cast the lower beam, and tension the prestress of the lower beam after the lower beam reaches the design strength. After the construction is completed, remove the lower beam support structure at an appropriate time.

[0008] The present invention provides a lower crossbeam support structure which also serves as a lower tower column construction platform and a construction method thereof. The lower crossbeam support structure comprises a steel pipe support, an inner steel distribution beam, an outer steel distribution beam, an inner steel truss, an outer steel truss, column embedded parts, a corbel, a sand cylinder, a tensioning system and an attached construction platform. The attached construction platform of the present invention is attached to the steel pipe column of the steel pipe support through a hoop, and adopts the form of "ground-type steel pipe support + steel truss". The attached construction platform is attached to the steel pipe support through the hoop, so that the construction of the lower tower column and the erection of the lower cross beam support structure are carried out simultaneously, and the steel pipe column is used as the supporting structure of the attached construction platform. Part of the steel bars of the lower cross beam are synchronously tied with the steel bars of the last segment of the lower tower column, and an adjustable length telescopic rod is welded on the hoop. The platform lifting and lowering is controlled by adjusting the attachment position of the hoop, and the horizontal working position of the platform is adjusted by the telescopic rod. In this way, the lower cross beam support structure is integrated and multi-purpose, and the high-altitude operation time of installing the attached construction platform is reduced, the construction efficiency of the main tower is improved, the construction cost is reduced, and the safety guarantee of the construction of the lower tower column and the lower cross beam is improved. The problems of long construction period of the lower cross beam, large material consumption, difficult cost control, and many high-altitude operations in the prior art are solved, and a high-efficiency and environmentally friendly new support structure and construction method thereof are provided for the construction of bridges and main towers, especially providing a direction for the selection of future high-tower lower cross beam construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the layout diagram of the lower crossbeam support; Figure 2 for Figure 1 Schematic diagram of AA direction; Figure 3 This is the structural diagram of the steel pipe support; Figure 4 This is the structural diagram of the attached construction platform; In the figure: steel pipe support 1, lower tower column 2, first attached wall 3, second attached wall 4, third attached wall 5, column embedded parts 6, outer steel distribution beam 7, inner steel truss 8, outer steel truss 9, corbel 10, tensioning system 11, flange 12, attached construction platform 13, inner steel distribution beam 14, sand cylinder 15, bottom formwork system 16, main tower base 17, main tower pedestal 18, lower cross beam 19, connection system 20, steel pipe column 21, telescopic rod 22, platform connection system 23, guardrail 24, platform panel 25, hoop 26. DETAILED DESCRIPTION

[0010] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0011] A lower crossbeam support structure which also serves as a lower tower column construction platform comprises a steel pipe support 1, an inner steel distribution beam 14, an outer steel distribution beam 7, an inner steel truss 8, an outer steel truss 9, a column embedded part 6, a corbel 10, a sand cylinder 15 and a tensioning system 11. A first attached wall 3 is fixed to the outer side walls on both sides of the second section ② of the lower tower column 2, a second attached wall 4 is fixed to the outer side walls on both sides of the fourth section ④ of the lower tower column 2, and a third attached wall 5 is fixed to the outer side walls on both sides of the sixth section ⑥ of the lower tower column 2; a steel pipe support 1 is arranged in the middle of two opposite lower tower columns 2, on the outer side of each lower tower column 2, on the main tower pedestal 18, and on the main tower base 17; each set of steel pipe supports 1 is composed of a steel pipe column 21, a connection system 20 and a flange 12; the segmented positions of the steel pipe column 21 are connected by the flange 12; all steel pipe supports The bottom end of the frame 1 is connected and fixed to the main tower pedestal 18 and the main tower base 17 by means of column embedded parts 6. The steel pipe column 21 is connected and fixed to the lower tower column 2 by means of the first attached wall 3, the second attached wall 4 and the third attached wall 5 to ensure the stability of the steel pipe support 1. The corbel 10 is attached to the side wall outside the seventh segment ⑦ of the lower tower column 2. A sand cylinder 15, an outer steel distribution beam 7 and an outer steel truss 9 are sequentially installed from bottom to top on the top of the corbel 10 and the top of the outer steel pipe support 1. The outer steel truss 9 is horizontally tied and fixed to the seventh segment ⑦ of the lower tower column 2 by means of a tensioning system 11 that crosses the seventh segment ⑦ of the lower tower column 2. An inner steel distribution beam 14, an inner steel truss 8, an outer steel distribution beam 7, an outer steel truss 9 and a bottom formwork system 16 are sequentially installed from bottom to top on the top of the steel pipe support 1 to support the casting of the lower cross beam 19.

[0012] The lower crossbeam support structure also includes an attached construction platform 13, which is attached to the steel pipe column 17 through a clamp 22, and an adjustable length telescopic rod 18 is welded on the clamp 22. The upper, middle and lower telescopic rods 18 are connected to form a truss structure through a platform connecting system 19. The platform panel 21 and the guardrail 20 that are perpendicular to each other and in an "L" shape are installed on the upper edge of the telescopic rod 18. The lifting and lowering of the attached construction platform 13 is controlled by adjusting the attachment position of the clamp 22, and the horizontal working position of the attached construction platform 13 is adjusted by adjusting the length of the telescopic rod 18.

[0013] A construction method for a lower crossbeam support structure that also serves as a lower tower column construction platform, the construction steps are as follows: 1. Construct the main tower cap 18, the main tower base 17, the first section ① and the second section ② of the lower tower column 2, and in the process, embed the column embedded parts 6 in time; 2. After the construction of the second section ② of the lower tower column 2 is completed, the structure below the flange 12 of the steel pipe support 1 is installed beside the second section ② of the lower tower column 2, on the main tower base 17 and the main tower cap 18, and the first attached wall 3 is connected. The attached construction platform 13 is installed on the steel pipe column 21 of the steel pipe support 1, and the attached construction platform 13 is attached to the steel pipe column 21 of the steel pipe support 1 by using the clamp 26, and the third section ③ of the lower tower column 2 is constructed by using the attached construction platform 13; 3. After the construction of the third section ③ of the lower tower column 2 is completed, the attached construction platform 13 is lifted to construct the fourth section ④ of the lower tower column 2. When the construction reaches the fourth section ④ of the lower tower column 2, the embedded parts of the second attached wall 4 attached to the lower tower column 2 are buried, and the second attached wall 4 is installed in time after the construction of the fourth section ④ of the lower tower column 2 is completed; 4. After the fifth section ⑤ of the lower tower column 2 is cast, the structure above the flange 12 of the steel pipe support 1 is installed, and the two parts are reliably connected and fixed by the flange 12, and the attached construction platform 13 is continued to be lifted, and the attached construction platform 13 is attached to the steel pipe column 21 of the steel pipe support 1 by using the clamp 26, and the sixth section ⑥ of the lower tower column 2 is constructed by using the attached construction platform 13, and the embedded parts of the third attached wall 5 on the sixth section ⑥ are embedded. After the construction of the sixth section ⑥ of the lower tower column 2 is completed, the third attached wall 5, the inner steel distribution beam 14, and the inner steel truss 8 are installed; 5. Lift the attached construction platform 13, install the bottom formwork system 16 on the top of the inner steel truss 8, and simultaneously tie the steel bars of the seventh segment ⑦ of the lower tower column 2 and the steel bars of the lower crossbeam 19 on the top of the inner steel truss 8. After the construction is completed, cast the seventh segment ⑦, and bury the embedded part of the corbel 10 and the embedded pipe of the tension system 11 at the outer side wall of the seventh segment ⑦; 6. After the construction of the seventh section ⑦ is completed, the bracket 10, the sand cylinder 15, the outer steel distribution beam 7, the tension system 11 and the outer steel truss 9 are installed in sequence; 7. Install the bottom formwork system 16 on the top of the outer steel truss 9 and tie the remaining steel bars of the lower beam 19; cast the lower beam 19, and tension the prestress of the lower beam 19 after the lower beam 19 reaches the design strength. After the construction is completed, remove the lower beam support structure at an appropriate time.

[0014] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to the present invention are within the scope of protection.

[0015] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A lower crossbeam support structure also serving as a lower tower column construction platform, characterized in that: The package includes steel pipe supports, inner steel distribution beams, outer steel distribution beams, inner steel trusses, outer steel trusses, column embedded parts, corbels, sand cylinders and tensioning systems. The first attached wall is fixed to the outer walls on both sides of the second segment of the lower tower column, the second attached wall is fixed to the outer walls on both sides of the fourth segment of the lower tower column, and the third attached wall is fixed to the outer walls on both sides of the sixth segment of the lower tower column. The tower column support is located above the middle of the main tower pedestal. Steel pipe supports are provided in the middle of the two opposite lower tower columns, on the outside of each lower tower column, on the top of the main tower base and on the top of the main tower pedestal. Each set of steel pipe supports consists of steel pipe columns, connection systems and flanges. The steel pipe columns are connected by flanges at the segmented positions. All steel The bottom end of the pipe support is connected and fixed to the main tower pedestal and the tower base with embedded column parts. The steel pipe column is connected and fixed to the lower tower column through the first wall attachment, the second wall attachment and the third wall attachment to ensure the stability of the steel pipe support; the corbel is attached to the side wall outside the seventh segment of the lower tower column, and the sand cylinder, the outer steel distribution beam and the outer steel truss are installed on the top of the corbel and the top of the outer steel pipe column from bottom to top. The tension system that crosses the seventh segment of the lower tower column fixes the outer steel truss to the seventh segment of the lower tower column, and the inner steel distribution beam and the inner steel truss, the outer steel distribution beam, the outer steel truss and the bottom formwork system are installed on the top of the steel pipe support from bottom to top to support the casting of the lower crossbeam.

2. The lower crossbeam support structure also serving as a lower tower column construction platform according to claim 1 is characterized in that: It also includes an attached construction platform, which is attached to a steel pipe column through a clamp, an adjustable-length telescopic rod is welded on the clamp, and the upper and lower telescopic rods are connected to form a truss structure through a platform connection system. The platform panels and guardrails that are perpendicular to each other and in an "L" shape are installed on the upper edge of the telescopic rod. The lifting and lowering of the attached construction platform is controlled by adjusting the attachment position of the clamp, and the horizontal working position of the attached construction platform is adjusted by adjusting the length of the telescopic rod.

3. A construction method for a lower crossbeam support structure also serving as a lower tower column construction platform, characterized in that: The construction steps are as follows: A. Construct the main tower cap, main tower base, first section and second section of the lower tower column, and embed the column embedded parts in time during this process; B. After the construction of the second section of the lower tower column is completed, install the part below the flange of the steel pipe support beside the second section of the lower tower column, on the main tower base and the main tower cap, connect the first attached wall, and install an attached construction platform on the steel pipe column of the steel pipe support, and use the attached construction platform to construct the third section of the lower tower column; C. After the third section of the lower tower column is constructed, the attached construction platform is lifted to construct the fourth section of the lower tower column. When the fourth section of the lower tower column is constructed, the embedded parts of the second attached wall attached to the lower tower column are buried, and the second attached wall is installed in time after the fourth section of the lower tower column is constructed; D. After the fifth section of the lower tower column is cast, install the part above the flange of the steel pipe support, and use the flange to connect the two parts into a whole, continue to lift the attached construction platform, and use the clamp to attach the attached construction platform to the steel pipe column of the steel pipe support part above the flange, use the attached construction platform to construct the sixth section of the lower tower column, and embed the embedded parts of the third wall on the sixth section. After the construction of the sixth section of the lower tower column is completed, install the third wall, the inner steel distribution beam, and the inner steel truss; E. Lift the attached construction platform, install the bottom formwork system on the top of the inner steel truss, and simultaneously tie the steel bars of the seventh segment of the lower tower column and the steel bars of the lower crossbeam on the top of the inner steel truss. After the construction is completed, cast the seventh segment, and bury the embedded part of the corbel and the embedded pipe of the tension system on the outer wall of the seventh segment; F. After the seventh section is completed, the bracket, sand cylinder, outer steel distribution beam, tension system and outer steel truss are installed in sequence; G. Install the formwork system on the top of the outer steel truss and tie the remaining steel bars of the lower beam; cast the lower beam, and tension the prestress of the lower beam after the lower beam reaches the design strength. After the construction is completed, remove the lower beam support structure at an appropriate time.

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