A construction method for large-drop and large-cantilever grid frame replacement assembly without support lifting

Abstract

The present invention discloses a method for the replacement and assembly of a large-drop, large-cantilever grid frame without support and lifting. The method comprises the following steps: setting a temporary support tower at the cantilever end, laying a sliding track, and extending the sliding track from the floor below the main area grid unit to above the temporary support tower at the cantilever end; assembling the large-drop, large-cantilever grid frame unit on the floor below the main area grid unit, with a sliding support system installed below the large-drop, large-cantilever grid frame unit; installing the sliding traction system and then towing the large-drop, large-cantilever grid frame unit along the sliding track to a predetermined position; assembling the main area grid unit on the floor below the main area grid unit; lifting the main area grid unit to a certain height, suspending it, and inserting and installing rods; connecting the large-drop, large-cantilever grid frame unit and the main area grid unit by suspending with steel cables; and lifting the entire structure. The method of the present invention reduces the number of construction measures and high-altitude operations, is safe, and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of grid construction, in particular to a support-free lifting construction method for assembling a grid with a large drop and large cantilever. Background Art

[0002] A grid is a spatial structure composed of multiple rods connected by nodes in a specific grid pattern. It is generally composed of roughly identical grids or smaller units (repetitions). It has high structural strength and good stability and is currently commonly used in roof structures. To meet the needs of different building shapes, grid shapes also have their own characteristics. Grid cantilever is a structural form widely used in modern architectural design. Its basic principle is to utilize the space inside the building by fixing cantilever beams or cantilever trusses to the exterior wall of the building. The main characteristics of this structural form are large span, light load, low deadweight, and simple construction. It is suitable for public buildings, stadiums, exhibition halls and other types of buildings.

[0003] Large-drop and large-cantilever grid frames are a common type of grid cantilever. Currently, the construction of large-drop and large-cantilever grid frames often requires the construction of large-area cantilevered cradles to provide support for the assembly of the cantilevered grid frames. Its operation is inconvenient, the cradle measures are large, and the cantilevered cradles require a large amount of high-altitude operations, which poses certain safety hazards.

[0004] Therefore, it is of great practical significance to develop a large-drop, large-cantilever grid construction method that is easy to operate, requires little frame work, requires little high-altitude work, and has little safety hazard. Summary of the Invention

[0005] Due to the above-mentioned defects in the prior art, the present invention provides a large-drop and large-cantilever truss construction method which is easy to operate, has small amount of cradle measures, small amount of high-altitude operations and small safety hazards. Specifically, the large-drop and large-cantilever truss is assembled by replacing the truss position in the main area and then sliding it into place, and then assembling the main area truss unit. The main area truss unit is first lifted for a distance, and then assembled into a whole with the large-drop and large-cantilever truss unit, and the large-drop and large-cantilever truss unit is suspended and followed by lifting by means of inclined steel cables, which solves the defects of the existing large-drop and large-cantilever truss construction, such as inconvenient operation, large amount of cradle measures, large amount of high-altitude operations of the cantilever truss, and large safety hazards.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A large-drop large-cantilever grid frame displacement assembly and support-free lifting construction method comprises the following steps:

[0008] (1) A temporary cantilever support tower is set at the cantilever end without a floor, and the top of the temporary cantilever support tower is flush with the floor. A sliding track is laid on the floor, and the sliding track extends from the floor below the main area grid unit to the top of the temporary cantilever support tower;

[0009] (2) Assembling large-drop large-cantilever grid units on the floor below the grid units in the main area, and installing a sliding support system below the large-drop large-cantilever grid units, and the sliding support system is arranged on the sliding track;

[0010] (3) Installing a sliding traction system on the sliding track, and pulling the large-drop large-cantilever grid unit to a predetermined lifting position of the large-drop large-cantilever grid unit through the sliding traction system;

[0011] (4) After removing the sliding track on the floor below the main area grid unit, assemble the main area grid unit on the floor below the main area grid unit;

[0012] (5) Lift the main area grid unit to a certain height and then suspend it, and then install the rods in the tear area between the main area grid unit and the large drop and large cantilever grid unit;

[0013] (6) The upper chord mid-span node of the large drop and large cantilever grid unit is connected to the node above the tearing hole of the main area grid unit by steel cable suspension;

[0014] (7) Overall lifting of large drop and large cantilever grid units and main area grid units.

[0015] The large-drop and large-cantilever truss displacement and assembly unsupported lifting construction method of the present invention adopts the method of displacement and assembly of steel truss units and then sliding them to the original position (the cantilever part only needs to provide support, and the cantilever frame construction amount is small), and adopts the method of suspension follow-up lifting through inclined cables (ensuring the stability of the overall structure during lifting), which greatly reduces the amount of construction measures and high-altitude operations, ensures the safety and reliability of the construction process, and has good application prospects.

[0016] As the preferred technical solution:

[0017] The above-mentioned method for the replacement assembly and support-free lifting construction of a large-drop large-cantilever grid frame comprises a sliding support system for the large-cantilever grid frame, a connecting rod between the sliding supports of the large-cantilever grid frame, and a sliding shoe at the bottom of the sliding support of the large-cantilever grid frame;

[0018] The large cantilevered grid frame sliding bracket and the sliding shoe at the bottom of the large cantilevered grid frame sliding bracket are connected through a connecting rod between the large cantilevered grid frame sliding brackets;

[0019] The large cantilevered grid frame sliding bracket and the sliding shoes at the bottom of the large cantilevered grid frame sliding bracket are arranged on both sides of the large drop large cantilevered grid frame unit.

[0020] The above-mentioned large-drop large-cantilever grid frame displacement assembly and support-free lifting construction method, wherein the sliding traction system includes a traction hand chain hoist and a traction wire rope;

[0021] The traction hand chain hoist moves along the sliding track by pulling the sliding support system through the traction wire rope.

[0022] In the above-mentioned method for the replacement and assembly of a large-drop and large-cantilever grid without support and lifting, the traction hand chain hoist is installed on the ear plate, and the ear plate is installed on the temporary support tower end of the cantilevered end of the sliding track.

[0023] As described above, a large-drop and large-cantilever truss displacement and assembly unsupported lifting construction method is provided, wherein a steel cable adjustment hand winch is installed on the large-drop and large-cantilever truss unit, one end of the steel cable is fixed on the steel cable adjustment hand winch, and the other end is fixed on the main area truss unit. The steel cable is tensioned and loosened by the steel cable adjustment hand winch to ensure that the large-drop and large-cantilever truss unit follows the lifting.

[0024] In the above-mentioned method for the replacement assembly and unsupported lifting construction of a large-drop and large-cantilevered grid frame, the main area grid unit lifting system for lifting the main area grid unit in step (5) includes a main grid lifting assembly installed on the high steel column and a main grid temporary lifting assembly installed on the low steel column;

[0025] The main grid lifting assembly is installed on the top of the high steel column, and the main grid temporary lifting assembly is fixed in the middle of the low steel column.

[0026] In the above-mentioned method for the replacement assembly and unsupported lifting of a large-drop and large-cantilevered grid frame, the temporary lifting components of the main grid frame are removed before the overall lifting in step (7);

[0027] The overall lifting system includes a main grid lifting assembly mounted on the top of the tall steel columns and a high-drop, high-cantilever grid unit lifting assembly mounted on the top of the low steel columns. The main grid lifting assembly includes a main grid lifting bracket mounted on the top of the tall steel columns, and the high-drop, high-cantilever grid unit lifting assembly includes a high-drop, high-cantilever grid lifting bracket mounted on the top of the low steel columns. The presence of the lifting brackets mainly ensures that the grid can be lifted to the installation height.

[0028] The above technical solution is only a feasible technical solution of the present invention. The protection scope of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0029] The above invention has the following advantages or beneficial effects:

[0030] (1) The large drop and large cantilever grid frame displacement assembly and support-free lifting construction method of the present invention adopts displacement assembly, occupies the main area grid position, and is assembled first. After the assembly is completed, it is transported to the original position through sliding measures, and then the main area grid unit is assembled. The main area grid unit is first lifted a distance and then assembled into a whole with the large drop and large cantilever grid frame unit. The operation is simple, the workload of the cantilever support measures is small, and the amount of high-altitude operations is small;

[0031] (2) The large-drop large-cantilever grid displacement assembly and unsupported lifting construction method of the present invention realizes the unsupported follow-up lifting of the large-drop large-cantilever grid units by means of inclined steel cables, thereby ensuring the stability of the overall structure during lifting, reducing the amount of high-altitude work, and making the construction process safe and reliable, with good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention and its features, configurations, and advantages will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings. Like reference numerals indicate like parts throughout the drawings. The drawings are not drawn to scale, emphasis instead being placed on illustrating the subject matter of the present invention.

[0033] Figure 1 This is a schematic elevation view of the state when the sliding traction system is installed in step (3) of the large drop and large cantilever grid replacement assembly and support-free lifting construction method of the present invention;

[0034] Figure 2 This is a schematic elevation view of the state of the large-drop large-cantilever grid unit being pulled into place in step (3) of the large-drop large-cantilever grid replacement assembly and support-free lifting construction method of the present invention;

[0035] Figure 3 It is a schematic elevation view of the state of step (4) of the large drop and large cantilevered grid displacement assembly and unsupported lifting construction method of the present invention;

[0036] Figure 4 It is a schematic elevation view of the state of step (6) of the large drop and large cantilevered grid displacement assembly and support-free lifting construction method of the present invention;

[0037] Among them, 1 is the large drop and large cantilever truss unit, 2 is the main area truss unit, 3 is the steel column, 4 is the floor, 5 is the temporary support tower at the cantilever end, 6 is the large cantilever truss sliding bracket, 61 is the connecting rod between the large cantilever truss sliding brackets, 62 is the bottom sliding shoe of the large cantilever truss sliding bracket, 71 is the traction wire rope, 72 is the traction hand hoist, 73 is the ear plate, 74 is the sliding track, 8 is the lifting system, 9 is the inclined cable, 10 is the steel cable adjustment hand hoist, and 12 is the rod. DETAILED DESCRIPTION

[0038] The structure of the present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0039] Example 1

[0040] A large-drop large-cantilever grid frame displacement assembly and support-free lifting construction method comprises the following steps:

[0041] (1) A temporary cantilever support tower 5 is provided at the cantilever end without a floor, and the top of the temporary cantilever support tower 5 is flush with the floor 4. A sliding track 74 is laid on the floor 4. The sliding track 74 extends from the floor 4 below the main area grid unit 2 to the top of the temporary cantilever support tower 5;

[0042] (2) Assembling the large drop and large cantilever grid unit 1 on the floor 4 below the main area grid unit 2, and installing a sliding support system below the large drop and large cantilever grid unit 1, and the sliding support system is arranged on the sliding track 74;

[0043] The sliding support system includes a large cantilevered grid frame sliding bracket 6, a connecting rod 62 between the large cantilevered grid frame sliding brackets, and a sliding shoe 61 at the bottom of the large cantilevered grid frame sliding bracket. The large cantilevered grid frame sliding bracket 6 and the sliding shoe 61 at the bottom of the large cantilevered grid frame sliding bracket are connected by the connecting rod 62 between the large cantilevered grid frame sliding brackets. The large cantilevered grid frame sliding bracket 6 and the sliding shoe 61 at the bottom of the large cantilevered grid frame sliding bracket are arranged on both sides of the large drop large cantilevered grid frame unit 1;

[0044] (3) Install a sliding traction system on the sliding track 74 (the sliding traction system includes a traction hand chain hoist 72 and a traction wire rope 71. The temporary support tower 5 at the cantilevered end of the sliding track 74 is equipped with an ear plate 73, and the traction hand chain hoist 72 is installed on the ear plate. The traction hand chain hoist 72 pulls the sliding support system along the sliding track 74 through the traction wire rope 71. At this time, Figure 1 As shown), the large drop and large cantilever grid unit 1 is pulled to the predetermined lifting position of the large drop and large cantilever grid unit by the sliding traction system (at this time, as shown in FIG. Figure 2 shown);

[0045] (4) After removing the sliding track 74 on the floor 4 below the main area grid unit 2, assemble the main area grid unit 2 on the floor 4 below the main area grid unit 2 (at this time, Figure 3 shown);

[0046] (5) Lift the main area grid unit 2 to a certain height and then suspend it, and then install the rods 12 in the tear area between the main area grid unit 2 and the large drop and large cantilever grid unit 1;

[0047] The main area grid unit lifting system for lifting the main area grid unit includes a main grid lifting assembly installed on the high steel column and a main grid temporary lifting assembly installed on the low steel column. The main grid lifting assembly is installed on the top of the high steel column, and the main grid temporary lifting assembly is fixed in the middle of the low steel column.

[0048] (6) The upper chord mid-span node of the large drop and large cantilever grid unit 1 is connected to the node above the tearing hole of the main area grid unit 2 by a steel cable 9. A steel cable adjustment hand winch 10 is installed on the large drop and large cantilever grid unit 1. One end of the steel cable 9 is fixed on the steel cable adjustment hand winch 10, and the other end is fixed on the main area grid unit 2 (at this time, Figure 4 shown);

[0049] (7) Remove the temporary lifting components of the main grid, and lift the large drop and large cantilever grid unit 1 and the main area grid unit 2 as a whole;

[0050] The overall lifting system for overall lifting includes a main frame lifting assembly installed on the top of the high steel column and a large-drop and large-cantilever frame unit lifting assembly installed on the top of the low steel column.

[0051] It has been verified that the large-drop large-cantilever grid frame displacement assembly and support-free lifting construction method of the present invention adopts displacement assembly to occupy the grid frame position in the main area and is assembled first. After the assembly is completed, it is transported to the original position through sliding measures, and then the main area grid unit is assembled. The main area grid unit is first lifted for a distance and then assembled into a whole with the large-drop large-cantilever grid frame unit. The operation is simple, the cantilever support measures have less workload, and the amount of high-altitude operations is less; by means of inclined steel cables, the large-drop large-cantilever grid frame unit is lifted without support, ensuring the stability of the overall structure during lifting, reducing the amount of high-altitude operations, and the construction process is safe and reliable, with good application prospects.

[0052] Those skilled in the art should understand that they can implement variations by combining the prior art with the above embodiments, which will not be described in detail here. Such variations do not affect the essence of the present invention and will not be described in detail here.

[0053] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A construction method for large-drop and large-cantilevered grid frame transposition assembly without support lifting, characterized by: The following steps are involved: (1) A temporary cantilever support tower is set up at the cantilever end without a floor, and the top of the temporary cantilever support tower is flush with the floor. A sliding track is laid on the floor, and the sliding track extends from the floor below the main area grid unit to the top of the cantilever support tower; (2) Assemble large-drop large-cantilever grid units on the floor below the grid units in the main area. A sliding support system is installed below the large-drop large-cantilever grid units, and the sliding support system is arranged on the sliding track; (3) Installing a sliding traction system on the sliding track, and pulling the large-drop large-cantilever grid unit to the predetermined lifting position of the large-drop large-cantilever grid unit through the sliding traction system; (4) After removing the sliding track on the floor below the main area grid unit, assemble the main area grid unit on the floor below the main area grid unit; (5) Lift the main area grid unit to a certain height and then suspend it, and then install the rods in the tear area between the main area grid unit and the large drop and large cantilever grid unit; (6) The upper chord mid-span node of the large drop and large cantilever grid unit is connected to the node above the tearing hole of the main area grid unit through a steel cable suspension connection; (7) Overall lifting of large drop and large cantilever grid units and main area grid units; The main area grid unit lifting system for lifting the main area grid unit in step (5) includes a main grid lifting component installed on the high steel column and a main grid temporary lifting component installed on the low steel column; The main grid lifting assembly is installed on the top of the high steel column, and the main grid temporary lifting assembly is fixed in the middle of the low steel column; Before the overall lifting in step (7), the temporary lifting components of the main grid are removed; The overall lifting system for overall lifting includes a main frame lifting assembly installed on the top of the high steel column and a large-drop and large-cantilever frame unit lifting assembly installed on the top of the low steel column.

2. The large drop and large cantilevered grid replacement assembly and support-free lifting construction method according to claim 1 is characterized in that: The sliding support system includes a large cantilevered grid frame sliding support, a connecting rod between the large cantilevered grid frame sliding support and a sliding shoe at the bottom of the large cantilevered grid frame sliding support; The large cantilevered grid frame sliding bracket and the sliding shoe at the bottom of the large cantilevered grid frame sliding bracket are connected through a connecting rod between the large cantilevered grid frame sliding brackets; The large cantilevered grid frame sliding bracket and the sliding shoes at the bottom of the large cantilevered grid frame sliding bracket are arranged on both sides of the large drop large cantilevered grid frame unit.

3. The large drop and large cantilevered grid replacement assembly and support-free lifting construction method according to claim 1 is characterized in that: The sliding traction system includes a traction hand chain hoist and a traction wire rope; The traction hand chain hoist moves along the sliding track by pulling the sliding support system through the traction wire rope.

4. The method for assembling and lifting a large drop and large cantilevered grid structure without support according to claim 3 is characterized in that: The traction hand chain hoist is installed on the ear plate, and the ear plate is installed on the temporary support tower end of the cantilevered end of the sliding track.

5. The large drop and large cantilevered grid frame transposition assembly and support-free lifting construction method according to claim 1 is characterized in that: A steel cable adjustment hand winch is installed on the large-drop large-cantilever grid unit. One end of the steel cable is fixed on the steel cable adjustment hand winch, and the other end is fixed on the main area grid unit.

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