Construction method of large-span truss steel structure roof

Abstract

The invention discloses a construction method for a large-span truss steel structure roof. The construction method comprises the following steps that 1, roof splicing is completed on a floor slab surface; the joint shaft joint outer lug plate is fixed to the roof; 2, the roof is lifted upwards through a lifting system, and after the roof is lifted to the first height, the assembling jig frame is disassembled; 3, a joint shaft joint inner lug plate fixed to the end of the bifurcated column is inserted between the two joint shaft joint outer lug plates, and a pin shaft is inserted into a pin shaft hole in the lug plate; 4, the roof is lifted step by step, and in the lifting process, the bifurcated columns are adjusted to be in the vertical posture from the inclined posture; continuously lifting the roof to the designed height; and 5, adjusting the posture of the bifurcated column, and connecting the lower end of the bifurcated column with the top of the supporting column. The method solves the problems that the joint shaft of the bifurcated column is difficult to install, the bifurcated column cannot be hoisted in place in a high-altitude narrow space, and the pin shaft of the joint shaft of the bifurcated column is high in high-altitude assembly difficulty.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure building construction, and particularly relates to a construction method for a large-span truss steel structure roof. Background Art

[0002] With the development of science and technology, the application of steel structure in super high-rise and large span buildings has become increasingly mature, gradually becoming the mainstream construction technology and the development direction of future buildings. With the continuous improvement of the pursuit of architectural aesthetics, in some large-span industrial and civil buildings, the sloping roof shape of Chinese ancient buildings, steel structure roofs with large curvature inclined curved surfaces, ridge skylights and bifurcated columns are widely used. This kind of steel roof has a large span, many height changes, and the ridge skylights and lower bifurcated columns are complex in structure, which brings huge challenges to the installation of steel roofs and bifurcated columns.

[0003] At present, the construction methods for large-span steel structure roofs and bifurcated columns mostly adopt steel roof lifting and installation, and bifurcated column hoisting and patching. Although this method can avoid high-altitude assembly operations to a great extent, the construction of bifurcated column hoisting and patching is difficult, and the construction quality is not easy to guarantee. It is difficult to apply to situations where the internal space of the building is small or the roof support position is equipped with a lifting frame to restrict the hoisting of the bifurcated column; another method is to install the bifurcated column first, and then install the structure that interferes with the roof and the bifurcated column during the construction of the steel roof. This method has the problem that the main force rods of the steel roof cannot be assembled, and a large number of temporary rods are required to reinforce the original roof structure. After the steel roof is lifted and put into place, the roof rods that are thrown out are installed, and then the temporary reinforcement rods are removed. This construction method will not only increase the construction cost of temporary facilities, but also increase safety hazards. A large number of temporary reinforcement rods are also not conducive to the adjustment of spatial position during steel structure assembly. Summary of the invention

[0004] The purpose of the present invention is to provide a large-span truss steel structure roof construction method to solve the technical problems existing in the construction of steel structure roof and bifurcated columns.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A large-span truss steel structure roof construction method comprises the following steps: Step 1, assembling the roof on the floor surface; fixing the outer ear plate of the joint axis node to the roof; Step 2, using the lifting system to lift the roof upwards, and after the roof is lifted to a first height, the assembly frame is removed; Step 3, inserting the inner ear plate of the joint axis node fixed to the end of the bifurcated column between the two outer ear plates of the joint axis nodes, and inserting the pin into the pin hole on the ear plate; Step 4, gradually lift the roof, and adjust the bifurcated columns from an inclined posture to a vertical posture during the lifting process; continue to lift the roof to the designed height; Step 5, adjust the posture of the forked column and connect the lower end of the forked column and the top of the supporting column.

[0006] In the large-span truss steel structure roof construction method of the present invention as described above, preferably, in step 1, the outer ear plate of the joint axis node is fixed to the roof by welding, and after welding is completed, the pin shaft hole of the outer ear plate of the joint axis node is milled using a portable milling machine to eliminate the eccentricity of the pin shaft hole of the outer ear plate caused by welding deformation, so as to meet the pin shaft assembly requirements.

[0007] In the large-span truss steel structure roof construction method of the present invention as described above, preferably, before fine milling the pin holes of the joint axis node outer ear plates, a temporary support rod is arranged between two adjacent joint axis node outer ear plates.

[0008] In the large-span truss steel structure roof construction method of the present invention as described above, preferably, the end of the joint axis node pin is subjected to chamfering.

[0009] In the large-span truss steel structure roof construction method of the present invention as described above, preferably, the specific process of step 2 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the design load until the roof is separated from the frame; after the roof is lifted to a height of 5 cm to 30 cm, the lifting is suspended and left to stand for 2 hours to 24 hours, and the roof and the lifting system are continuously observed during the standing period for any abnormalities. After the standing is completed and no abnormalities are found, the roof is lifted to the first height and the assembly frame is removed.

[0010] In the large-span truss steel structure roof construction method as described above of the present invention, preferably, the specific process of step 3 is: smear butter on the outer ear plate and the inner ear plate of the joint axis node, use a hand winch in conjunction with a crane to tilt the forked column and insert the inner ear plate of the joint axis node between the outer ear plates of the joint axis node; at the same time, insert the pin into the pin hole of the outer ear plate of the joint axis node on one side, set an ear plate at the end of the pin inserted into the pin hole, connect it to the ear plate with a steel wire rope, and the other end of the steel wire rope is connected to the first hand winch, adjust the tension of the first hand winch, and shake the pin to make it slowly pass through the pin hole.

[0011] In the large-span truss steel structure roof construction method of the present invention as described above, preferably, the specific process of step 4 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load, and the roof is lifted upward; as the roof is lifted, the bifurcated column connected to the roof is gradually separated from the floor surface, and the second hand winch connected between the lower end of the bifurcated column and the roof is slowly loosened to adjust the bifurcated column to a vertical state; and the roof is continued to be lifted to the design height.

[0012] The large-span truss steel structure roof construction method of the present invention as described above preferably further comprises the step of dismantling the lifting system after step 5 is completed.

[0013] The beneficial effects of the present invention are: The bifurcated column and the roof are assembled as one, and the bifurcated column and the roof are lifted synchronously; after lifting to the design elevation, the bifurcated column is rotated vertically into place, which solves the problem of difficulty in installing the bifurcated column joint axis, the bifurcated column cannot be hoisted into place in a narrow space at high altitude, and the difficulty in assembling the bifurcated column joint axis pin at high altitude; it ensures the orderliness, reliability, and efficiency of the construction of the bifurcated column under the large-span steel roof. In addition, by using a portable milling machine to repair holes on site, the control of the welding deformation of the bifurcated column ear plate is simplified, and the processing cost of the bifurcated column is saved. At the same time, the bifurcated lifting and vertical rotation method fully utilizes the rotatability of the joint axis to reduce the construction difficulty and improve the convenience of the operation; the bifurcated column is rotated vertically into place, which is conducive to efficient positioning and precise installation of the bifurcated column. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or other advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein: Figure 1 A side view of a roof assembly according to an embodiment of the present invention; Figure 2 A schematic diagram of on-site fine milling of an external ear plate according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a roof frame for removing and assembling a roof frame according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the assembly of a bifurcated column joint shaft according to an embodiment of the present invention; Figure 5 This is a schematic diagram of assembling and installing a bifurcated column according to an embodiment of the present invention; Figure 6 A schematic diagram of synchronous lifting of a roof and a bifurcated column according to an embodiment of the present invention; Figure 7 A schematic diagram of the vertical rotation installation of a bifurcated column according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the installation of the roof and bifurcated columns of an embodiment of the present invention; Fig. 9 The present invention is a flowchart of a large-span truss steel structure roof construction method according to an embodiment of the present invention.

[0015] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Roof, 2. Support column, 3. Lifting system, 4. Assembly frame, 5. Floor surface, 6. External ear plate of joint axis node, 61. Pin hole, 62. Temporary support rod, 63. Pin, 64. First hand chain hoist, 65. Second hand chain hoist, 7. Portable milling machine, 8. Internal ear plate of joint axis node, 9. Forked column. DETAILED DESCRIPTION

[0016] Hereinafter, an embodiment of a large-span truss steel structure roof construction method of the present invention will be described with reference to the accompanying drawings.

[0017] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0018] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0019] Example 1 Fig. 9 The flowchart of the construction method of a large-span truss steel structure roof according to an embodiment of the present invention includes: Step 1, such as Figure 1 As shown, the roof is assembled on the floor surface; the outer ear plate of the joint axis node is fixed to the roof; in step 1, as shown in Figure 2 As shown, the external ear plate is approximately located at Figure 1 At the A position in the joint axis node, the outer ear plate is fixed to the roof by welding. After welding, a portable milling machine is used to mill the pin holes of the outer ear plates of the joint axis node to eliminate the eccentricity of the pin holes of the outer ear plates caused by welding deformation, so as to meet the pin assembly requirements. Before fine milling the pin holes of the outer ear plates of the joint axis node, a temporary support rod is set between two adjacent outer ear plates of the joint axis node. The end of the pin of the joint axis node is processed with a chamfered arc angle. The above processing can make the installation of the pin smoother and avoid jamming during the installation process.

[0020] Step 2: Use the lifting system to lift the roof upwards. After the roof is lifted to the first height, remove the assembly frame. Figure 3As shown; the lifting system of the present invention is preferably a hydraulic lifting system, for example, the hydraulic lifting system includes computer control, electrical control, hydraulic pump source system, hydraulic lifter, sensor detection, rotating sling, etc. The specific process of step 2 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the design load until the roof is separated from the frame; after the roof is lifted to a height of 5 cm to 30 cm, the lifting is suspended and left to stand for 2 hours to 24 hours, and the roof and the lifting system are continuously observed during the standing period for abnormalities. After the standing is completed and there are no abnormalities, the roof is lifted to the first height and the assembly frame is removed. Step-by-step loading and standing can avoid construction risks caused by assembly problems and lifting system problems, and avoid equipment damage and casualties.

[0021] Step 3, such as Figure 4 As shown, Figure 4 The bifurcated column joint axis is approximately located at Figure 3 At position B in the middle, insert the inner ear plate of the joint axis node fixed at the end of the bifurcated column between the two outer ear plates of the joint axis nodes, and insert the pin into the pin hole on the ear plate; the specific process of step 3 is: smear butter on the outer ear plate and the inner ear plate of the joint axis node, use a hand chain hoist to cooperate with a crane to tilt the bifurcated column and insert the inner ear plate of the joint axis node between the outer ear plates of the joint axis node; at the same time, insert the pin into the pin hole of the outer ear plate of the joint axis node on one side, set an ear plate at the end of the pin inserted into the pin hole, connect it to the ear plate with a wire rope, and the other end of the wire rope is connected to the first hand chain hoist, adjust the tension of the first hand chain hoist, and shake the pin to make it slowly pass through the pin hole.

[0022] Step 4: gradually raise the roof, such as Figure 5 As shown in the figure, during the lifting process, the bifurcated column is adjusted from an inclined posture to a vertical posture; the roof is continued to be lifted to the designed height, as shown in the figure. Figure 6 As shown; the specific process of step 4 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load, and the roof is lifted upward; as the roof is lifted, the bifurcated column connected to the roof is gradually separated from the floor surface, and the second hand winch connected between the lower end of the bifurcated column and the roof is slowly loosened to adjust the bifurcated column to a vertical state; the roof is continued to be lifted to the design height.

[0023] Step 5: Adjust the posture of the bifurcated column and connect the lower end of the bifurcated column and the top of the support column. Figure 7 After step 5 is completed, the step of removing the lifting system is also included, such as Figure 8 shown.

[0024] Example 2 Embodiment 2 of the present invention provides a method for constructing a large-span truss steel structure roof. Taking the construction of a forked column of a steel structure roof as an example, Figure 1 As shown. The construction of the steel structure roof bifurcated column lifting and vertical rotation must first complete the roof assembly on the floor surface. Figure 2 As shown, the milling of the outer ear plate of the joint axis node is completed.

[0025] When the roof and lifting system are fully assembled, the roof needs to be inspected and accepted, and then lifted after passing the acceptance. Debug the hydraulic lifting system; check whether the lifting module and all temporary measures for hydraulic lifting meet the design requirements; after confirmation, start trial lifting; load step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the design load until the roof is separated from the frame; after the overall lifting is about 100mm, suspend the lifting and let it stand for 2 to 24 hours. During the standing period, continue to observe whether there are any abnormalities in the roof and lifting measures. After the standing is completed and there are no abnormalities, such as Figure 3 As shown, the roof is lifted a certain distance and the assembly frame is removed to allow construction machinery to enter and fork column installation.

[0026] Transport the bifurcated column to the installation location, such as Figure 4 As shown, grease the two outer ear plates and the inner ear plate of the joint axis node, use a hand chain hoist with a crane to tilt the bifurcated column and insert the inner ear plate of the joint axis node into the outer ear plate. At the same time, insert the pin into the pin hole of the outer ear plate on one side, set the ear plate at the end of the pin inserted into the pin hole, use a wire rope to pass through the joint axis hole and fix it to the ear plate, and the other end of the wire rope is connected to the first hand chain hoist. By adjusting the tension of the first hand chain hoist and shaking the pin to slowly pass through the outer ear plate and the joint axis hole of the joint axis node, the joint bearing node assembly is completed.

[0027] The roof is lifted again by loading step by step. Figure 5 As shown, the bifurcated column is lifted off the floor surface, and at the same time, Figure 6 As shown, slowly loosen the second hand chain hoist used to fix the angle of the bifurcated column to adjust the bifurcated column to a vertical state. Continue to lift the roof to the designed elevation.

[0028] Use the "fine-tuning and inching" function of the hydraulic lifting system to make each lifting point reach the designed position to meet the installation requirements; install the structural component patching section and Figure 7 As shown in the figure, the bifurcated column is rotated vertically to the installation position for patching, so that the lifting unit forms a complete force system. Finally, the hydraulic synchronous lifting system and temporary measures are removed to complete the lifting operation of the lifting module and the installation of the bifurcated column. Figure 8 shown.

[0029] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A method for constructing a large-span truss steel structure roof, characterized in that: The following steps are involved: Step 1, assembling the roof on the floor surface; fixing the outer ear plate of the joint axis node to the roof; Step 2, using the lifting system to lift the roof upwards, and after the roof is lifted to a first height, the assembly frame is removed; Step 3, inserting the inner ear plate of the joint axis node fixed to the end of the bifurcated column between the two outer ear plates of the joint axis nodes, and inserting the pin into the pin hole on the ear plate; Step 4, gradually lift the roof, and adjust the bifurcated columns from an inclined posture to a vertical posture during the lifting process; continue to lift the roof to the designed height; Step 5, adjust the posture of the forked column and connect the lower end of the forked column and the top of the supporting column.

2. The method for constructing a large-span truss steel structure roof according to claim 1, characterized in that: In step 1, the outer ear plate of the joint axis node is fixed to the roof by welding. After welding, a portable milling machine is used to mill the pin holes of the outer ear plate of the joint axis node to eliminate the eccentricity of the pin holes of the outer ear plate caused by welding deformation, so as to meet the pin assembly requirements.

3. The method for constructing a large-span truss steel structure roof according to claim 2, characterized in that: Before fine milling the pin shaft hole of the outer ear plate of the joint axis node, a temporary support rod is arranged between two adjacent outer ear plates of the joint axis node.

4. The method for constructing a large-span truss steel structure roof according to claim 2, characterized in that: The end of the joint axis node pin is subjected to chamfering processing.

5. The method for constructing a large-span truss steel structure roof according to claim 1, characterized in that: The specific process of step 2 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load until the roof is separated from the frame; after the roof is lifted to a height of 5 cm to 30 cm, the lifting is suspended and left to stand for 2 to 24 hours. During the standing period, the roof and the lifting system are continuously observed for any abnormalities. After the standing is completed and no abnormalities are found, the roof is lifted to the first height and the assembly frame is removed.

6. The method for constructing a large-span truss steel structure roof according to claim 1, characterized in that: The specific process of step 3 is: apply butter on the outer ear plate and the inner ear plate of the joint axis node, use a hand winch and a crane to tilt the forked column and insert the inner ear plate of the joint axis node between the outer ear plates of the joint axis node; at the same time, insert the pin into the pin hole of the outer ear plate of the joint axis node on one side, set an ear plate at the end of the pin inserted into the pin hole, connect it to the ear plate with a wire rope, and the other end of the wire rope is connected to the first hand winch, adjust the tension of the first hand winch, and shake the pin to make it slowly pass through the pin hole.

7. The method for constructing a large-span truss steel structure roof according to claim 1, characterized in that: The specific process of step 4 is: the lifting system is loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load, and the roof is lifted upward; as the roof is lifted, the bifurcated column connected to the roof is gradually separated from the floor surface, and the second hand winch connected between the lower end of the bifurcated column and the roof is slowly loosened to adjust the bifurcated column to a vertical state; continue to lift the roof to the design height.

8. The method for constructing a large-span truss steel structure roof according to claim 1, characterized in that: After step 5 is completed, the step of dismantling the lifting system is also included.

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