A construction method for installing an octagonal steel-concrete cable tower

Abstract

The present invention discloses a construction method for installing an octagonal steel-concrete cable tower, including a bridge. To ensure the stability of the cable tower and saddle installation structure, an I20a support skeleton is set above the assembly jig. The form of the support skeleton is arranged according to the octagonal cable tower structure form. The setting of the support skeleton can facilitate the temporary positioning of the cable tower and saddle assembly, ensuring the stability and safety during the assembly process. The construction process of the octagonal steel-concrete cable tower can improve the flow operation of the cable tower structure construction, which is beneficial to the safety control of the construction operation and the improvement of work efficiency, and conforms to the construction characteristics of the prefabricated bridge structure. The construction process of the octagonal steel-concrete cable tower, through the setting of the assembly jig with the same proportional size, is simple to operate, safe and reliable, can improve the construction efficiency of the cable tower, save construction costs, and greatly reduce the construction period and measure fees.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to an installation construction method for a regular octagonal steel-clad concrete cable tower. Background Art

[0002] Prefabricated bridges can continuously improve the needs of bridge construction according to the needs of bridge construction, give full play to the functional characteristics of bridges, and improve the efficiency of construction. Prefabricated bridges are an innovative construction method. The prefabricated bridge components produced and processed in a modular manner in the factory are transported to the construction site, hoisted and assembled as a whole. Prefabricated bridges have the characteristics of standardized design, modularized products, factory production, mechanized assembly, and refined management. They have great advantages in energy conservation and emission reduction, environmental protection, etc., and are in line with the green energy-saving concept of low carbon, environmental protection and high efficiency in today's society.

[0003] Traditional bridge towers usually use concrete structures, which have slow construction progress and high construction safety risks. Steel-clad concrete towers are the embodiment of prefabricated bridge construction structures. The outer walls of the towers are mainly made of steel structures, which are assembled and welded. Time application replaces the installation of concrete formwork, greatly improving the construction efficiency of the towers. The regular octagonal steel-clad concrete tower design structure optimizes the stress mode of the tower column structure and improves the durability of the tower column. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a method for installing and constructing a regular octagonal steel-clad concrete cable tower, comprising a bridge,

[0005] S1. According to the work surface and overall construction plan provided on site, sufficient personnel shall be deployed. All personnel shall be briefed on safety and technology. Special operation personnel shall be certified before taking up their posts. Sufficient production materials shall be prepared before construction. Steel pipe piles, channel steels, steel plates and other materials shall meet the requirements of relevant technical standards and be tested and verified before use. Unqualified products shall not be used. All machinery and equipment shall meet the requirements of relevant laws and regulations. They shall be installed and debugged before entering the site and can only be used after passing the inspection. Safety production briefing shall be conducted for on-site workers, and the danger sources and precautions of on-site construction shall be clarified to ensure construction safety.

[0006] S2. According to the regular octagonal structure of the cable tower, 9 concrete foundations with a length of 80cm, a width of 80cm and a height of 50cm are set up at the cable tower assembly site. A steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is embedded above the concrete foundation to connect the supporting pipe piles; the supporting pipe piles are steel pipe piles with a diameter of 50cm and a wall thickness of 8mm; 80mm angle steel is used to connect the steel pipe piles for scissor bracing. A steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is set above the steel pipe piles, and an I25a I-beam is set above the steel plate. A 20mm steel plate is fully laid above the I25a I-beam. Its structural size and style are the same as the cable tower structure.

[0007] S3. To ensure the stability of the cable tower and saddle installation structure, an I20a support frame is set above the assembly frame. The support frame is arranged in the form of a regular octagonal cable tower structure. The setting of the support frame can facilitate the temporary positioning of the cable tower and saddle assembly, ensuring the stability and safety of the assembly process;

[0008] S4. A positioning plate is set on the steel plate on the top surface of the assembly frame, and the inner wall of the cable tower is positioned by the positioning plate. The inner tower wall is hoisted in sections to the predetermined position of the assembly frame by the D1100-63 tower crane, and then the installation position of the inner tower wall is checked by the "nine-point verification method". After confirmation, it is temporarily fixed;

[0009] S5. The outer tower wall of the cable tower is assembled in sections. The 5.5m high cable tower is divided into two layers, upper and lower, and assembled in blocks. The installation position of the outer tower wall is checked by the "nine-point verification method". After confirmation, the installation and welding of the connecting angle steel are carried out. During the installation process, the installation position and deformation should be checked at any time. If any abnormality is found, it should be adjusted in time.

[0010] S6. After the cable tower is assembled, a special hoisting frame is set according to the characteristics of the cable tower structure. The hoisting frame is customized with Q235 material φ48×3.5mm high-strength steel pipe. The hoisting wire rope is calculated according to the hoisting working conditions and is of type 6*37, with a nominal tensile strength of 1850N / mm2 and a diameter of 47.5mm.

[0011] S7. The tower concrete is vibrated with an inserted vibrator, and an experienced concrete worker is assigned to be responsible for it. When operating the inserted vibrator, it is advisable to "insert quickly and withdraw slowly". The moving distance of the inserted vibrator should not exceed 1.5 times its effective radius, and a distance of 5 to 10 cm should be maintained from the tower wall. The vibrator should be inserted about 5 to 10 cm into the lower layer of concrete, and all parts should be vibrated to make it dense. The sign of density is that the concrete stops sinking, no more bubbles appear, the surface becomes flat, and there is slurry.

[0012] Preferably, after the inner and outer tower walls of the cable tower are assembled, the outer tower wall positioning control plate is positioned, installed and welded. The positioning control plate adopts a 2 cm thick steel plate, is 0.4 m high and 0.1 m wide.

[0013] Preferably, the chamfered groove of the positioning control plate is set flush with the top surface of the outer tower wall to ensure the control of the plane position and assembly accuracy of the tower segments during assembly. A total of 4 positioning control plates are set for each tower section, and the setting position is symmetrical about the center line of the outer axis of the regular octagonal tower.

[0014] Preferably, after the installation of the cable tower hoisting forming frame and the wire rope is completed and inspected and qualified, the cable tower is hoisted by a D1100-63 tower crane. In order to ensure the positioning accuracy and operational safety of each segment during the installation of the cable tower, positioning control plates are set on the four front sides of the octagonal upper tower column to facilitate the positioning accuracy control of the installation construction of each segment of the cable tower. The positioning plates are welded to the outer tower wall of the cable tower.

[0015] Preferably, in order to prevent the deformation of the cable tower steel tower wall panel due to excessive concrete pouring speed, the concrete pouring speed should be controlled. When pouring concrete, carefully observe whether the steel bars, segmental steel structures, embedded parts and reserved holes are moving, deformed, or blocked. If any problems are found, they should be dealt with immediately and corrected before the poured concrete begins to set.

[0016] Preferably, in order to prevent the concrete surface from losing water too quickly and causing cracks between the concrete and the steel tower wall of the cable tower, the top surface concrete is promptly covered with geotextile and watered for maintenance after the initial setting of the concrete. When the ambient temperature is lower than 5°C, it should be noted that watering the concrete surface is prohibited, and heat preservation and moisturizing maintenance should be adopted.

[0017] Preferably, in order to reduce the temperature of the steel shell in the high-temperature construction environment in summer, a freely retractable sunshade is set at the top, and sunshades are set around. At the same time, the uneven deformation of the steel tower wall of the cable tower caused by partial sunlight can be minimized. In order to facilitate the vertical steel bar connection and welding of the steel shell segments when installing the next segment, according to the requirements of the design drawings, 50 cm high concrete at the top of the steel shell of each segment is poured together with the concrete of the next segment.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The regular octagonal steel-clad concrete cable tower construction process of the present invention can improve the flow construction of the cable tower structure, is conducive to the safety control of the construction operation and the improvement of work efficiency, and conforms to the construction characteristics of the assembled bridge structure;

[0020] The construction technology of regular octagonal steel-clad concrete cable tower adopts the setting of assembling frames of the same proportion and size. It is simple to operate, safe and reliable, and can improve the construction efficiency of the cable tower, save construction costs, and greatly reduce the construction period and measures costs.

[0021] The construction technology of the regular octagonal steel-clad concrete cable tower adopts a specially designed hoisting and shaping frame, which can avoid the deformation and distortion of the regular octagonal cable tower wall during the hoisting process, and provide great safety guarantee for the hoisting of the cable tower wall;

[0022] The construction technology of regular octagonal steel-clad concrete cable tower can greatly improve the positioning accuracy control of the cable tower wall by setting a positioning control plate on the outside of the tower wall, effectively improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a process flow chart of the present invention;

[0024] Figure 2 This is a schematic diagram of assembling a tire frame according to the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the inner tower wall of the cable tower of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation of the cable tower after the assembly of the present invention is completed;

[0027] Figure 5 This is a schematic diagram of the installation of the positioning control panel of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-5 The present invention provides a technical solution: a method for installing and constructing a regular octagonal steel-clad concrete cable tower, including a bridge,

[0030] S1. According to the work surface and overall construction plan provided on site, sufficient personnel shall be deployed. All personnel shall be briefed on safety and technology. Special operation personnel shall be certified before taking up their posts. Sufficient production materials shall be prepared before construction. Steel pipe piles, channel steels, steel plates and other materials shall meet the requirements of relevant technical standards and be tested and verified before use. Unqualified products shall not be used. All machinery and equipment shall meet the requirements of relevant laws and regulations. They shall be installed and debugged before entering the site and can only be used after passing the inspection. Safety production briefing shall be conducted for on-site workers, and the danger sources and precautions of on-site construction shall be clarified to ensure construction safety.

[0031] S2. According to the regular octagonal structure of the cable tower, 9 concrete foundations with a length of 80cm, a width of 80cm and a height of 50cm are set up at the cable tower assembly site. A steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is embedded above the concrete foundation to connect the supporting pipe piles; the supporting pipe piles are steel pipe piles with a diameter of 50cm and a wall thickness of 8mm; 80mm angle steel is used to connect the steel pipe piles for scissor bracing. A steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is set above the steel pipe piles, and an I25a I-beam is set above the steel plate. A 20mm steel plate is fully laid above the I25a I-beam. Its structural size and style are the same as the cable tower structure.

[0032] S3. To ensure the stability of the cable tower and saddle installation structure, an I20a support frame is set above the assembly frame. The support frame is arranged in the form of a regular octagonal cable tower structure. The setting of the support frame can facilitate the temporary positioning of the cable tower and saddle assembly, ensuring the stability and safety of the assembly process;

[0033] S4. A positioning plate is set on the steel plate on the top surface of the assembly frame, and the inner wall of the cable tower is positioned by the positioning plate. The inner tower wall is hoisted in sections to the predetermined position of the assembly frame by the D1100-63 tower crane, and then the installation position of the inner tower wall is checked by the "nine-point verification method". After confirmation, it is temporarily fixed;

[0034] S5. The outer tower wall of the cable tower is assembled in sections. The 5.5m high cable tower is divided into two layers, upper and lower, and assembled in blocks. The installation position of the outer tower wall is checked by the "nine-point verification method". After confirmation, the installation and welding of the connecting angle steel are carried out. During the installation process, the installation position and deformation should be checked at any time. If any abnormality is found, it should be adjusted in time.

[0035] S6. After the cable tower is assembled, a special hoisting frame is set according to the characteristics of the cable tower structure. The hoisting frame is customized with Q235 material φ48×3.5mm high-strength steel pipe. The hoisting wire rope is calculated according to the hoisting working conditions and is of type 6*37, with a nominal tensile strength of 1850N / mm2 and a diameter of 47.5mm.

[0036] S7. The tower concrete is vibrated with an inserted vibrator, and an experienced concrete worker is assigned to be responsible for it. When operating the inserted vibrator, it is advisable to "insert quickly and withdraw slowly". The moving distance of the inserted vibrator should not exceed 1.5 times its effective radius, and a distance of 5 to 10 cm should be maintained from the tower wall. The vibrator should be inserted about 5 to 10 cm into the lower layer of concrete, and all parts should be vibrated to make it dense. The sign of density is that the concrete stops sinking, no more bubbles appear, the surface becomes flat, and there is slurry.

[0037] When the inner and outer tower walls of the cable tower are assembled, the positioning control panel of the outer tower wall is positioned, installed and welded. The positioning control panel is made of 2cm thick steel plate, 0.4m high and 0.1m wide. The chamfered groove of the positioning control panel is set flush with the top surface of the outer tower wall to ensure that the plane position and assembly accuracy of the cable tower segments are controlled during assembly. There are 4 positioning control panels in total for each cable tower section, and the setting position is symmetrical about the center line of the outer axis of the regular octagonal cable tower. After the installation of the cable tower hoisting forming frame and the steel wire rope are completed and inspected and qualified, the D1100-63 tower crane is used to hoist the cable tower. In order to ensure the positioning accuracy and operational safety of each segment during the installation of the cable tower, positioning control panels are set on the four front sides of the octagon of the upper tower column to facilitate the positioning accuracy control of the installation and construction of each segment of the cable tower, and the positioning panels are welded to the outer wall of the cable tower.

[0038] In order to prevent the deformation of the cable tower steel tower wall panel due to excessive concrete pouring speed, the concrete pouring speed should be controlled. When pouring concrete, carefully observe whether the steel bars, segmental steel structures, embedded parts and reserved holes are moving, deformed, or blocked. If any problems are found, they should be dealt with immediately and corrected before the poured concrete begins to set. In order to prevent the cracks between the concrete and the cable tower steel tower wall caused by excessive water loss on the surface of the concrete, the top surface concrete should be covered with geotextile and watered for maintenance in time after the concrete begins to set. When the ambient temperature is When the temperature is below 5℃, it should be noted that watering the concrete surface is prohibited, and thermal insulation and moisturizing maintenance should be adopted. In order to reduce the temperature of the steel shell in the high temperature construction environment in summer, a freely retractable awning is set at the top, and sunshades are set around. At the same time, the uneven deformation of the cable tower steel tower wall caused by partial sunlight can be minimized. In order to facilitate the vertical steel bar connection and welding of the steel shell segment during the installation of the next segment, according to the requirements of the design drawings, the 50cm high concrete at the top of the steel shell of each segment is poured together with the concrete of the next segment.

[0039] Working principle: By setting up brackets at the cable tower assembly site, 9 50cm*80cm*80cm concrete piers are set up, and 16mm*60mm*60mm steel plates are laid on the concrete piers. Above the steel plates are 500mm diameter steel pipes, and above the steel pipes are I25a I-beams. Each bracket is connected with 80mm angle steel, and the top surface is fully paved with 2cm thick steel plates; above the steel plates is a cable tower positioning skeleton composed of I20a I-beams, and its size structure is the same as the cable tower structure style. The use of this type of assembly frame effectively ensures the overall structure of the cable tower assembly. The stability and construction safety of the tower are improved, and the risks of high-altitude operations and inconvenience in installation and operation are reduced. According to the structural characteristics of the regular octagonal steel-clad concrete tower, a high-strength steel customized welded tower hoisting setting frame is used to ensure that the tower is free from the problem of wire rope extrusion deformation and twisting deformation of the tower structure during the hoisting process. The setting frame can make the tower stable, safe and reliable during the hoisting process. After the regular octagonal steel-clad concrete tower is welded into a whole, a positioning control board is set on the upper mouth of the tower outer wall to ensure that the tower segment controls the plane position and assembly accuracy during assembly. The positioning control board is made of 2cm thick steel plate, 0.4m high and 0.1m wide.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for installing a regular octagonal steel-clad concrete cable tower, comprising a bridge, Features: S1. According to the work surface and overall construction plan provided on site, sufficient personnel shall be deployed. All personnel shall be briefed on safety and technology. Special operation personnel shall be certified before taking up their posts. Sufficient production materials shall be prepared before construction. Steel pipe piles, channel steels and steel plates shall meet the requirements of relevant technical standards and be tested and verified before use. Unqualified products shall not be used. All machinery and equipment shall meet the requirements of relevant laws and regulations. They shall be installed and debugged before entering the site and can only be used after passing the inspection. Safety production briefing shall be conducted for on-site workers, and the danger sources and precautions of on-site construction shall be clarified to ensure construction safety. S2. According to the regular octagonal structure of the cable tower, 9 concrete foundations with a length of 80cm, a width of 80cm and a height of 50cm are set at the cable tower assembly site. A steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is embedded above the concrete foundation to connect the supporting pipe piles; the supporting pipe piles are steel pipe piles with a diameter of 50cm and a wall thickness of 8mm; 80mm angle steels are used to connect the steel pipe piles for scissor bracing, and a steel plate with a length of 60cm, a width of 60cm and a thickness of 16mm is set above the steel pipe piles, and an I25a I-beam is set above the steel plate, and a 20mm steel plate is fully laid above the I25a I-beam. Its structural size and style are the same as the cable tower structure; S3. To ensure the stability of the cable tower and saddle installation structure, an I20a support frame is set above the assembly frame. The support frame is arranged in the form of a regular octagonal cable tower structure. The setting of the support frame can facilitate the temporary positioning of the cable tower and saddle assembly, ensuring the stability and safety of the assembly process; S4. A positioning plate is set on the steel plate on the top surface of the assembly frame, and the inner wall of the cable tower is positioned by the positioning plate. The inner tower wall is hoisted in sections to the predetermined position of the assembly frame by the D1100-63 tower crane, and then the installation position of the inner tower wall is checked by the "nine-point verification method". After confirmation, it is temporarily fixed; S5. The outer tower wall of the cable tower is assembled in sections. The 5.5m high cable tower is divided into two layers, upper and lower, and assembled in blocks. The installation position of the outer tower wall is checked by the "nine-point verification method". After confirmation, the installation and welding of the connecting angle steel are carried out. The installation position and deformation should be checked at any time during the installation process. If any abnormality is found, it should be adjusted in time. S6. After the pylon is assembled, according to the characteristics of the pylon structure form, a special hoisting and shaping frame is set up. The hoisting and shaping frame is customized with high-strength steel pipes of φ48×3.5mm made of Q235 material. The hoisting steel wire rope is calculated according to the hoisting working conditions and is found to be of type 6×37 with a nominal tensile strength of 1850N / mm 2 , and the steel wire rope with a diameter of 47.5mm; S7. The tower concrete is vibrated with an inserted vibrator, and an experienced concrete worker is assigned to be responsible for it. When operating the inserted vibrator, it is advisable to "insert quickly and withdraw slowly". The moving distance of the inserted vibrator should not exceed 1.5 times its effective radius, and a distance of 5 to 10 cm should be maintained from the tower wall. The vibrator should be inserted about 5 to 10 cm into the lower layer of concrete, and all parts should be vibrated to make it dense. The sign of density is that the concrete stops sinking, no more bubbles appear, the surface becomes flat, and there is slurry.

2. A method for installing and constructing a regular octagonal steel-clad concrete cable tower according to claim 1, Features: When the inner and outer tower walls of the cable tower are assembled, the outer tower wall positioning control panel is positioned, installed and welded. The positioning control panel is made of 2cm thick steel plate, 0.4m high and 0.1m wide.

3. A construction method for installing an octagonal steel-encased concrete cable tower according to claim 2, characterized in that: The chamfered groove of the positioning control plate is set flush with the top surface of the outer tower wall to ensure the control of the plane position and assembly accuracy during the assembly of the cable tower segments. A total of 4 positioning control plates are provided for each cable tower segment, and the installation positions are symmetrically arranged along the outer axis center line of the octagonal cable tower.

4. A construction method for installing an octagonal steel-encased concrete cable tower according to claim 3, characterized in that: After the cable tower hoisting and shaping frame and steel wire ropes are installed and inspected to be qualified, a D1100-63 type tower crane is used to hoist the cable tower. To ensure the positioning accuracy and operation safety of each segment during the installation of the cable tower, positioning control plates are provided on the four fronts of the octagon of the upper tower column, which is convenient for controlling the installation construction positioning accuracy of each segment of the cable tower. The positioning plates are welded to the outer tower wall of the cable tower.

5. A construction method for installing an octagonal steel-encased concrete cable tower according to claim 4, characterized in that: To prevent the deformation of the steel tower wall panel of the cable tower due to the too fast concrete pouring speed, the concrete pouring speed should be controlled. When pouring concrete, carefully observe whether the steel bars, segment steel structures, embedded parts and reserved holes move or deform. If any problems are found, they should be dealt with immediately and corrected before the initial setting of the already poured concrete.

6. A construction method for installing an octagonal steel-encased concrete cable tower according to claim 5, characterized in that: To prevent the surface layer of the concrete from losing water too fast and causing cracks between the concrete and the steel tower wall of the cable tower, after the initial setting of the concrete, the top surface of the concrete is covered with geotextiles and wetted with water for curing in time. When the ambient temperature is lower than 5°C, it should be noted that watering curing of the concrete surface is prohibited, and heat preservation and moisture preservation curing should be adopted.

7. A construction method for installing an octagonal steel-encased concrete cable tower according to claim 6, characterized in that: To reduce the temperature of the steel shell in the high-temperature construction environment in summer, a freely telescopic sunshade is set at the top, and sunshade covers are set around. At the same time, the uneven deformation of the steel tower wall of the cable tower caused by the sun exposure can also be minimized. To facilitate the connection of vertical steel bars and the welding of steel shell segments during the installation of the next segment, according to the requirements of the design drawings, the concrete 50 cm high at the top of the steel shell of each segment is poured together with the concrete of the next segment.

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