Construction method of large-span truss net steel structure roof

Abstract

The application discloses a construction method of a large-span truss steel structure roof, which comprises the following steps: step 1, completing roof assembly on a floor surface; fixing joint shaft nodes outer ear plates to the roof; step 2, lifting the roof upward by using a lifting system, and removing the assembly jig frame after the roof is lifted to a first height; step 3, inserting joint shaft nodes inner ear plates fixed at the end of the bifurcated column into two joint shaft nodes outer ear plates, and inserting a pin shaft into a pin shaft hole on the ear plate; step 4, gradually lifting the roof, and adjusting the bifurcated column from an inclined posture to a vertical posture in the process of lifting; continuing to lift the roof to a design height; and step 5, adjusting the posture of the bifurcated column, and connecting the lower end of the bifurcated column and the top of the support column. The method solves the problems of difficult installation of the bifurcated column joint shaft, inability to hoist the bifurcated column into place in a narrow space in the air, and difficulty in high-altitude assembly of the bifurcated column joint shaft pin shaft.

Description

Technical Field

[0001] This invention belongs to the field of steel structure building construction technology, and in particular relates to a construction method for a large-span truss steel structure roof. Background Technology

[0002] With the development of technology, the application of steel structure buildings in super high-rise and large-span buildings has become increasingly mature, gradually becoming a mainstream construction technique and the future direction of building development. As the pursuit of architectural aesthetics continues to rise, the sloping roof style of traditional Chinese architecture, along with steel structure roofs, ridge skylights, and bifurcated columns with large curvature and inclined surfaces, is widely adopted in some large-span industrial and civil buildings. These steel roofs have large spans and varied heights, and the ridge skylights and lower bifurcated columns have complex structures, posing significant challenges to the installation of the steel roofs and bifurcated columns.

[0003] Currently, the construction methods for large-span steel structure roofs and bifurcated columns often involve lifting and installing the steel roof, followed by hoisting and embedding the bifurcated columns. While this method largely avoids high-altitude assembly work, the hoisting and embedding of the bifurcated columns is difficult, and the construction quality is hard to guarantee. It is unsuitable for situations where the internal space of the building is limited or where lifting frames restrict the hoisting of the bifurcated columns at the roof support locations. Another method is to install the bifurcated columns first, and then install the structural components that interfere with the roof and bifurcated columns during the steel roof construction. This method has the drawback of not being able to assemble the main load-bearing members of the steel roof, requiring the use of a large number of temporary members to reinforce the original roof structure. After the steel roof is lifted and positioned, the roof components that were omitted are installed, and then the temporary reinforcement members are removed. This construction method not only increases the construction cost of temporary facilities but also increases safety hazards. Furthermore, the large number of temporary reinforcement members is not conducive to adjusting the spatial position during the steel structure assembly. Summary of the Invention

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

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A construction method for a large-span truss steel structure roof, comprising the following steps:

[0006] Step 1: Assemble the roof on the floor slab; fix the outer ear plate of the joint axis node to the roof;

[0007] Step 2: Use the lifting system to lift the roof upwards. After the roof is lifted to the first height, remove the assembly frame.

[0008] Step 3: Insert the inner ear plate of the joint axis node fixed at the end of the bifurcation column into the space between the outer ear plates of the two joint axis nodes, and insert the pin into the pin hole on the ear plate.

[0009] Step 4: Gradually lift the roof, adjusting the bifurcated columns from an inclined position to a vertical position during the lifting process; continue lifting the roof to the designed height.

[0010] Step 5: Adjust the orientation of the forked column and connect the lower end of the forked column to the top of the support column.

[0011] The construction method for a large-span truss steel structure roof as described above is preferably described in step 1, in which 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 misalignment of the pin holes of the outer ear plate caused by welding deformation, so as to meet the pin assembly requirements.

[0012] In the construction method of the large-span truss steel structure roof described above, preferably, before precision milling the pin holes of the outer ear plates of the joint axis nodes, temporary struts are set between two adjacent outer ear plates of the joint axis nodes.

[0013] In the construction method of the large-span truss steel structure roof described above, preferably, the ends of the joint axis node pins are chamfered.

[0014] The construction method for a large-span truss steel structure roof as described above, preferably, involves the following steps in step 2: The lifting system is loaded in stages according to the design load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% until the roof detaches from the jig; after the roof is lifted 5 cm to 30 cm, the lifting is paused and the roof is 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 period is completed and no abnormalities are found, the roof is lifted to the first height and the assembly jig is dismantled.

[0015] The construction method for a large-span truss steel structure roof as described above, preferably, involves the following steps in step 3: applying grease to the outer ear plate and inner ear plate of the joint axis node; using a hand-operated hoist in conjunction with a crane to tilt and lift the bifurcated column and insert the inner ear plate of the joint axis node between the outer ear plates of the joint axis node; simultaneously inserting a pin into the pin hole of one side of the outer ear plate of the joint axis node; setting an ear plate at the end of the pin inserted into the pin hole; connecting the ear plate with a steel wire rope; connecting the other end of the steel wire rope to the first hand-operated hoist; adjusting the tension of the first hand-operated hoist and shaking the pin to slowly pass it through the pin hole.

[0016] The construction method for a large-span truss steel structure roof as described above, preferably, involves the following steps in step 4: The lifting system loads the roof upwards in stages according to the design load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%; as the roof is lifted, the bifurcated columns connected to the roof gradually detach from the floor slab; the second hand-operated hoist connected between the lower end of the bifurcated column and the roof surface is slowly released to adjust the bifurcated column to a vertical position; the roof is then lifted to the design height.

[0017] The construction method for a large-span truss steel structure roof as described above, preferably includes a step of dismantling the lifting system after step 5 is completed.

[0018] The beneficial effects of this invention are:

[0019] By assembling the bifurcated columns and roof as a single unit, and lifting them synchronously, followed by vertical rotation to position the bifurcated columns after reaching the design elevation, this method solves the problems of difficult installation of the bifurcated column joint shafts, the inability to hoist the bifurcated columns into position in confined spaces at high altitudes, and the high-altitude assembly difficulties of the bifurcated column joint shaft pins. This ensures the orderly, reliable, and efficient construction of the lower bifurcated columns of the large-span steel roof. Furthermore, the use of a portable milling machine for on-site hole preparation simplifies the control of welding deformation of the bifurcated column ear plates, saving on bifurcated column processing costs. Simultaneously, the bifurcated lifting and vertical rotation method fully utilizes the rotatability of the joint shafts to reduce construction difficulty and improve operational convenience. Vertical rotation to position the bifurcated columns facilitates efficient and precise installation. Attached Figure Description

[0020] The advantages of the present invention, both above and / or other aspects, will become clearer and more readily understood through the following detailed description taken in conjunction with the accompanying drawings, which are merely illustrative and do not limit the invention, wherein:

[0021] Figure 1 This is a side view of the roof assembly according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of on-site precision milling of the outer ear plate according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a roof dismantling and assembly frame according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the assembly of a bifurcated column joint shaft according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the assembly and installation of the bifurcated column according to an embodiment of the present invention;

[0026] Figure 6This is a schematic diagram illustrating the synchronous lifting of the roof and the bifurcated columns according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the vertical rotation installation of the bifurcated column according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the completed installation of the roof and bifurcated columns according to an embodiment of the present invention;

[0029] Figure 9 This is a flowchart illustrating a construction method for a large-span truss steel structure roof according to an embodiment of the present invention.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Roof, 2. Support column, 3. Lifting system, 4. Assembly frame, 5. Floor slab, 6. Joint axis node outer ear plate, 61. Pin hole, 62. Temporary strut, 63. Pin, 64. First hand chain hoist, 65. Second hand chain hoist, 7. Portable milling machine, 8. Joint axis node inner ear plate, 9. Forked column. Detailed Implementation

[0032] In the following description, embodiments of the construction method for large-span truss steel structure roofs of the present invention will be described with reference to the accompanying drawings.

[0033] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0034] The accompanying drawings in this specification are schematic diagrams to aid in illustrating the concept of the invention, and schematically show the shapes of the various parts and their interrelationships. Please note that, in order to clearly demonstrate the structure of the components in the embodiments of the invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0035] Example 1

[0036] Figure 9 This is a flowchart illustrating a construction method for a large-span truss steel structure roof according to an embodiment of the present invention, which includes:

[0037] Step 1, as follows Figure 1 As shown, the roof assembly is completed on the floor slab; the outer ear plate of the joint axis node is fixed to the roof; in step 1, as... Figure 2 As shown, the outer ear plate is roughly located Figure 1 At point A, 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 to eliminate misalignment of the pin holes caused by welding deformation, ensuring that the pins meet the assembly requirements. Before precision milling the pin holes of the outer ear plate, a temporary support rod is installed between two adjacent outer ear plates. The end of the joint axis node pin is chamfered. This treatment allows for smoother pin installation and avoids jamming during installation.

[0038] Step 2: Use the lifting system to lift the roof upwards. After the roof reaches the first height, dismantle the assembly frame. Figure 3 As shown; the lifting system described in this invention is preferably a hydraulic lifting system, such as a hydraulic lifting system including computer control, electrical control, hydraulic pump source system, hydraulic lifter, sensor detection, rotating hoist, etc. The specific process of step 2 is as follows: 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 detached from the jig; after the roof is lifted 5 cm to 30 cm, the lifting is paused 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 period is completed and there are no abnormalities, the roof is lifted to the first height and the assembly jig is removed. Step-by-step loading and standing can avoid construction risks caused by assembly problems and hoisting system problems, and avoid equipment damage and personnel casualties.

[0039] Step 3, as follows Figure 4 As shown, Figure 4 The bifurcated column joint axis is approximately located at Figure 3 In section B, the inner ear plate of the joint axis node, which is fixed to the end of the forked column, is inserted between the outer ear plates of the two joint axis nodes, and the pin is inserted into the pin hole on the ear plate. The specific process of step 3 is as follows: apply grease to the outer ear plate and the inner ear plate of the joint axis node, use a hand chain hoist in conjunction with a crane to tilt and lift 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 one side of the joint axis node, set the ear plate at the end of the pin inserted into the pin hole, connect the ear plate with a steel wire rope, and connect the other end of the steel wire rope to the first hand chain hoist. By adjusting the tension of the first hand chain hoist and shaking the pin, it is slowly passed through the pin hole.

[0040] Step 4, gradually raise the roof, such as Figure 5 As shown, during the lifting process, the bifurcated column is adjusted from an inclined position to a vertical position; the roof is then lifted to the designed height, as follows. Figure 6As shown; the specific process of step 4 is as follows: the lifting system loads the roof in stages according to the design load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%; as the roof is lifted, the bifurcated columns connected to the roof gradually detach from the floor slab, and the second hand-operated hoist connected between the lower end of the bifurcated column and the roof is slowly released to adjust the bifurcated column to a vertical state; the roof is then lifted to the design height.

[0041] Step 5: Adjust the orientation of the forked column, connecting the lower end of the forked column to the top of the support column, as follows: Figure 7 As shown. After step 5 is completed, the process also includes dismantling the lifting system, as shown... Figure 8 As shown.

[0042] Example 2

[0043] Embodiment 2 of the present invention provides a construction method for a large-span truss steel structure roof. Taking the construction of a bifurcated column of a steel structure roof as an example, as follows... Figure 1 As shown. The construction of the steel structure roof bifurcated column lifting and vertical rotation first requires the roof assembly to be completed on the floor slab. For example... Figure 2 As shown, the milling hole of the outer ear plate of the joint axis node is completed.

[0044] Once the roof and lifting system are fully assembled, the roof must be inspected and accepted. After passing the inspection, the roof can be removed from the formwork and lifted. The hydraulic lifting system should be tested and adjusted; the lifting modules and all temporary hydraulic lifting measures should be checked to ensure they meet design requirements. After confirmation, a trial lift should begin. Loading should be applied in stages according to the design load: 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%, until the roof detaches from the formwork. After lifting approximately 100mm, lifting should be paused and the roof left to stand for 2 to 24 hours. During this period, the roof and lifting measures should be continuously observed for any abnormalities. Once the standing period is complete and no abnormalities are observed, the roof can be lifted. Figure 3 The roof is raised a certain distance and the assembly frame is removed to allow construction machinery to enter and for the installation of branch columns.

[0045] Transport the bifurcated column to the installation location, such as Figure 4 As shown, apply grease to the outer and inner ear plates of the joint shaft node. Use a hand-operated hoist in conjunction with a crane to tilt and lift the forked column, inserting the inner ear plate of the joint shaft node into the outer ear plate. Simultaneously, insert the pin into the pin hole on one side of the outer ear plate. A lug is attached to the end of the pin inserted into the pin hole. A steel wire rope is passed through the joint shaft hole and fixed to the lug. The other end of the steel wire rope is connected to the first hand-operated hoist. By adjusting the tension of the first hand-operated hoist and shaking the pin, it is slowly passed through the outer ear plate and joint shaft hole of the joint shaft node, completing the assembly of the joint bearing node.

[0046] The roof was then lifted again using a step-by-step loading method, such as... Figure 5As shown, the bifurcated column is lifted off the floor slab, and simultaneously, as... Figure 6 As shown, slowly release the second chain hoist used to fix the angle of the branch column to adjust the branch column to a vertical position. Then continue to lift, raising the roof to the design elevation.

[0047] Utilizing the "fine-tuning and jogging" functions of the hydraulic lifting system, each lifting point is brought to its designed position to meet installation requirements; the structural components are then fitted into the insert sections, and so on... Figure 7 As shown, the bifurcated column is vertically rotated to the installation position for insertion, thus forming a complete force-bearing system for the lifting unit. Finally, the hydraulic synchronous lifting system and temporary measures are removed, completing the lifting operation of the lifting module and the installation of the bifurcated column. Figure 8 As shown.

[0048] The technical features disclosed above are not limited to the combinations of the disclosed features with other features. Those skilled in the art can also make other combinations of the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A construction method for a large-span truss steel structure roof, characterized in that, Includes the following steps: Step 1: Complete the roof assembly on the floor slab; fix the joint axis node outer ear plate to the roof; in Step 1, the joint axis node outer ear plate is fixed to the roof by welding. After welding, use a portable milling machine to mill the pin hole of the joint axis node outer ear plate to eliminate the misalignment of the pin hole caused by welding deformation, so as to meet the pin assembly requirements. Step 2: Use the lifting system to lift the roof upwards. After the roof is lifted to the first height, remove the assembly frame. Step 3: Insert the inner ear plate of the joint axis node fixed to the end of the forked column into the space between the outer ear plates of the two joint axis nodes, and insert the pin into the pin hole on the ear plate; The specific process of Step 3 is as follows: Apply grease to the outer ear plate and the inner ear plate of the joint axis node, use a hand chain hoist in conjunction with a crane to tilt and lift the forked column and insert the inner ear plate of the joint axis node into the space between the outer ear plates of the joint axis node; At the same time, insert the pin into the pin hole of one side of the outer ear plate of the joint axis node, set the ear plate at the end of the pin inserted into the pin hole, connect the ear plate with a steel wire rope, and connect the other end of the steel wire rope 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; Step 4: Gradually lift the roof, adjusting the bifurcated columns from an inclined to a vertical position during the lifting process; continue lifting the roof to the design height; the specific process of Step 4 is as follows: the lifting system loads the roof in stages according to the design load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%; as the roof is lifted, the bifurcated columns connected to the roof gradually detach from the floor slab, and the second hand-operated hoist connecting the lower end of the bifurcated column and the roof surface is slowly released to adjust the bifurcated column to a vertical position; continue lifting the roof to the design height; Step 5: Adjust the orientation of the forked column and connect the lower end of the forked column to the top of the support column.

2. The construction method for a large-span truss steel structure roof according to claim 1, characterized in that, Before precision milling the pin holes of the joint pivot node outer ear plates, temporary struts are installed between two adjacent joint pivot node outer ear plates.

3. The construction method for a large-span truss steel structure roof according to claim 1, characterized in that, The end of the joint axis node pin is chamfered.

4. The construction method for a large-span truss steel structure roof according to claim 1, characterized in that, The specific process of step 2 is as follows: The lifting system is loaded in stages according to the design load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% until the roof is detached from the jig. After the roof is lifted 5 cm to 30 cm, the lifting is paused 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 period is completed and there are no abnormalities, the roof is lifted to the first height and the assembly jig is removed.

5. The construction method for 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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