Section steel hoisting construction method for steel reinforced concrete cable bent tower of cable-stayed swivel bridge

Abstract

The invention discloses a cable-stayed swivel bridge steel reinforced concrete cable bent tower profile steel hoisting construction method. A profile steel positioning frame of a support, a profile steel sling, a connecting plate for temporarily fixing profile steel and a high-strength bolt for the connecting plate are arranged according to a cable bent tower profile steel plane; the cable bent tower profile steel is hoisted and constructed in batches according to the construction sequence requirement; according to the section arrangement diagram of the cable bent tower and the plane installation position diagram of the cable bent tower profile steel, a profile steel positioning frame is manufactured, dotting and marking are conducted on the positioning frame according to the plane position arrangement diagram of the profile steel, and the cut short section angle steel is welded to the positioning frame according to the made point positions; the profile steel lifting appliance is manufactured according to the plane spacing of the same row of profile steel of the cable bent tower, and the profile steel lifting appliance can lift two profile steel at a time; according to a cable bent tower profile steel plane arrangement diagram, firstly, four pieces of profile steel corresponding to the four corner positions of a cable bent tower are hoisted, the perpendicularity of each piece of profile steel is accurately adjusted with the help of instruments and equipment, and welding is conducted; horizontally lifting the profile steel positioning frame to the position of a cable bent tower, and tightly and firmly connecting the profile steel positioning frame with the installed four pieces of profile steel at the corners; adopting a profile steel lifting appliance to lift the sling tower profile steel to a to-be-mounted position in batches to finish positioning and temporary fixing of the profile steel; welding operators weld the section steel one by one. The defects of a conventional hoisting construction method are overcome, and the hoisting construction method which is efficient, high in quality and low in risk is provided.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a method for hoisting and constructing steel-concrete cable towers of a cable-stayed swivel bridge. Background Art

[0002] The existing similar steel-concrete tower steel hoisting construction method is: ① Use lifting equipment to lift the steel sections to the installation position one by one, and adjust the verticality of the steel sections with the help of plumb bob, level rod or theodolite. When the verticality meets the requirements, use cable wind rope or guide chain to temporarily fix it to ensure that it does not shift. Use a welding machine to weld and fix the steel sections to be installed with the steel sections of the previous stage to ensure that the steel sections will not shift when the cable wind rope is loosened. Loosen the lifting wire rope to complete the installation of the steel section, and then continue to lift the next steel section.

[0003] ② When making steel, reserve connection holes for the connection plates at both ends of the steel in advance, and make connection plates corresponding to the reserved holes. Use lifting equipment to lift the steels one by one to the required position, and use plumb bob, level ruler or theodolite to adjust the verticality of the steels. Then, use the connection plates and high-strength bolts to temporarily fix the steels to be installed with the embedded steels in the previous stage, loosen the lifting equipment, and then manually weld the upper and lower steels. After welding, remove the temporary connection plates. This method can better adapt to the hoisting construction of cable tower steel structures with different structural forms, especially for structures with relatively dispersed steel structures.

[0004] However, this conventional sequential operation has the following problems: ① The lifting equipment takes a long time to operate, and the vertical adjustment of the steel section is difficult and takes a long time. In addition, each steel section to be installed must be welded at the root or the connecting plate must be fixed before the lifting equipment can be released.

[0005] ② The efficiency of personnel and mechanical equipment is relatively low, personnel are seriously idle, and the usage fee of lifting equipment increases.

[0006] ③Extend the construction period and increase project management costs.

[0007] ④High safety risk. When the wire rope of the lifting equipment is loosened, the root of the steel is basically temporarily fixed. The steel is in a large cantilever state, with low wind resistance and a greater risk of overturning. This fast lifting construction method is especially suitable for steel construction methods with a large number of steels, small spacing and tight construction period. Summary of the invention

[0008] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a method for hoisting and constructing steel-concrete towers of a cable-stayed and rotating bridge, overcome the deficiencies of conventional hoisting and construction methods, and provide a high-efficiency, high-quality, and low-risk hoisting and construction method.

[0009] The technical solution adopted by the present invention is: A method for hoisting steel concrete tower of a cable-stayed swivel bridge, characterized by comprising the following steps: Step 1: According to the cable tower steel plan layout, the steel positioning frame, steel hanger, connecting plate for temporary fixing of the steel, and high-strength bolts for the connecting plate are supported; Step 2: Make positioning frames, steel hoists and flanges according to the construction requirements, and install the cable tower steel in batches according to the construction sequence requirements; Step 3: According to the cross-sectional layout of the cable tower and the plane installation position diagram of the cable tower steel, use I10 I-beam to make the steel positioning frame. The positioning frame is required to be in one plane without distortion or deformation. Cut the 50×50 angle steel into short sections of 5 to 10 cm in length, mark the positioning frame according to the plane position layout diagram of the steel, and weld the cut short section angle steel to the positioning frame according to the prepared points. Step 4: According to the plane spacing of the same row of steel sections of the cable tower, use t=20mm steel plate to make steel section hoists, so that the steel section hoists can hoist two steel sections at a time; Step 5: According to the cable tower steel plan layout, first hoist the four steels corresponding to the four corners of the cable tower, and use instruments and equipment to accurately adjust the verticality of each steel, and control the error within the allowable range of the specification. The welding workers will perform full-section welding at the root of the adjusted steel according to the requirements of the design drawings to ensure the quality of the steel welds and the weld grade meets the design requirements of the drawings; Step 5: Lift the steel locating frame horizontally to the cable tower position, and connect it tightly and firmly with the four installed corner steels. Ensure the accuracy of the plane position of the steel locating frame during installation; Step 6: Use steel hoists to lift the cable tower steel in batches to the installation location. The root of the steel to be installed is connected to the exposed steel of the previous stage through flanges and high-strength bolts. The top of the steel to be installed is directly stuck in the slot of the steel positioning frame to complete the positioning and temporary fixation of the steel. Step 7: Welding workers weld the steel sections one by one, and remove the temporary connection flange and steel section positioning frame at the base of the cable tower to complete the steel section hoisting construction of this section of the cable tower.

[0010] The steel sling is a rectangular steel plate (1) with an arc-shaped lifting lug (2) on the long side, and a lifting hole is provided at the center of the arc-shaped lifting lug (2) and at two corners below the rectangular steel plate (1); the size of the steel plate of the steel sling is 25cm×60cm, and the diameter of the lifting hole is Ф=30mm.

[0011] The beneficial effects of the present invention are: It is easy to adjust the verticality of the steel section, the operation time is short, the personnel and mechanical equipment are highly efficient, the construction period is short, the operation is safe, the positioning is accurate, the wind resistance is strong, and there is no risk of overturning. It is suitable for steel section construction with a large number of steels, relatively small spacing, and a tight construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the construction structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the structure of the sling of the present invention.

[0014] Figure 3 It is a plan view of the steel positioning frame of the present invention.

[0015] Figure 4 It is a plan view of the steel positioning frame of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1-4 As shown, a method for hoisting steel-concrete cable tower of a cable-stayed rotating bridge comprises the following steps: Step 1: According to the cable tower steel plan layout, support steel positioning frames, steel hangers, connecting plates for temporary fixing of steel, and high-strength bolts for connecting plates.

[0018] Step 2: Make positioning frames, steel hoists, flanges, etc. according to the construction requirements, and install the tower steel in batches according to the construction sequence.

[0019] Step 3. According to the cross-sectional layout of the cable tower and the plane installation position diagram of the cable tower steel, use I10 I-beam to make the steel positioning frame. The positioning frame is required to be in one plane without distortion. Cut the 50×50 angle steel into short sections of 5 to 10 cm in length, mark the positioning frame according to the plane position layout diagram of the steel, and weld the cut short section angle steel to the positioning frame according to the prepared points.

[0020] Step 4: According to the plane spacing of the same row of steel sections of the cable tower, a steel plate with a diameter of t=20mm is used to make a steel section lifting steel section lifting fixture, which can lift two steel sections at a time. The size of the steel section lifting fixture steel plate is 25cm×60cm. A lifting wire rope lifting hole is reserved on the steel section lifting fixture, and the lifting hole diameter is Ф=30mm. The steel section lifting fixture is a rectangular steel plate (1) with an arc-shaped lifting lug (2) on the long side, and a lifting hole is provided at the center of the arc-shaped lifting lug (2) and at the two corners below the rectangular steel plate (1).

[0021] Step 5. According to the cable tower steel plan layout, first hoist the four steels corresponding to the four corners of the cable tower respectively, and use instruments and equipment to accurately adjust the verticality of each steel, and control the error within the allowable range of the specification. The welding workers will perform full-section welding at the root of the adjusted steel according to the requirements of the design drawings to ensure the quality of the steel welds and the weld grade meets the design requirements of the drawings.

[0022] Step 6: Hoist the steel positioning frame, lay it flat and lift it to the tower position, tightly and firmly connect it to the four installed corner steels, and ensure the accuracy of the plane position of the steel positioning frame during installation.

[0023] Step 7: Use steel lifting equipment to lift the cable tower steel in batches to the installation location. The root of the steel to be installed is connected to the exposed steel in the previous stage through flanges and high-strength bolts. The top of the steel to be installed is directly stuck in the slot of the steel positioning frame to complete the positioning and temporary fixation of the steel.

[0024] Step 8: The welding workers weld the steel sections one by one and remove the temporary connection flange and steel section installation and positioning frame at the base of the cable tower. The steel section hoisting construction of the cable tower in this section is completed.

Claims

1. A method for hoisting steel concrete tower of a cable-stayed swivel bridge, characterized in that: The following steps are involved: Step 1: According to the cable tower steel plan layout, the steel positioning frame, steel hanger, connecting plate for temporary fixing of the steel, and high-strength bolts for the connecting plate are supported; Step 2: Make positioning frames, steel hoists and flanges according to the construction requirements, and install the cable tower steel in batches according to the construction sequence requirements; Step 3: According to the cross-sectional layout of the cable tower and the plane installation position diagram of the cable tower steel, use I10 I-beam to make the steel positioning frame. The positioning frame is required to be in one plane without distortion or deformation; Cut the 50×50 angle steel into short sections of 5 to 10 cm in length, mark points on the positioning frame according to the plane position layout of the steel section, and weld the cut short section angle steel on the positioning frame according to the prepared points; Step 4: According to the plane spacing of the same row of steel sections of the cable tower, use t=20mm steel plate to make steel section hoists, so that the steel section hoists can hoist two steel sections at a time; Step 5: According to the cable tower steel plan layout, first hoist the four steels corresponding to the four corners of the cable tower, and use instruments and equipment to accurately adjust the verticality of each steel, and control the error within the allowable range of the specification. The welding workers will perform full-section welding at the root of the adjusted steel according to the requirements of the design drawings to ensure the quality of the steel welds and the weld grade meets the design requirements of the drawings; Step 5: Lift the steel locating frame horizontally to the cable tower position, and connect it tightly and firmly with the four installed corner steels. Ensure the accuracy of the plane position of the steel locating frame during installation; Step 6: Use steel hoists to lift the cable tower steel in batches to the installation location. The root of the steel to be installed is connected to the exposed steel of the previous stage through flanges and high-strength bolts. The top of the steel to be installed is directly stuck in the slot of the steel positioning frame to complete the positioning and temporary fixation of the steel. Step 7: Welding workers weld the steel sections one by one, and remove the temporary connection flange and steel section positioning frame at the base of the cable tower to complete the steel section hoisting construction of this section of the cable tower.

2. The method for hoisting steel of steel-concrete tower of a cable-stayed rotating bridge according to claim 1 is characterized in that: The steel sling is a rectangular steel plate (1) with an arc-shaped lifting lug (2) on the long side, and a lifting hole is provided at the center of the arc-shaped lifting lug (2) and at two corners below the rectangular steel plate (1); the size of the steel plate of the steel sling is 25cm×60cm, and the diameter of the lifting hole is Ф=30mm.

Images