CN-116556690-B - High-precision positioning and mounting method for large-span grid structure

CN116556690BCN 116556690 BCN116556690 BCN 116556690BCN-116556690-B

Abstract

The invention provides a high-precision positioning and installing method of a large-span grid structure, which belongs to the technical field of large-span grid installation and comprises the steps of correcting the design size and the actual size of a first-section grid; the method comprises the steps of carrying out primary hoisting on the first-section net rack, carrying out high-precision difference adjustment on the first-section net rack, carrying out consolidation installation on the first-section net rack, carrying out sequential splicing installation on the subsequent net rack, wherein the operation steps of sequential splicing installation on the subsequent net rack are carried out by adopting the steps same as those in the first-section net rack installation method, correcting the size of the first-section net rack before hoisting, carrying out real-time comparison on the positions of actually measured four corner points and the positions of corresponding corner points in a design drawing in the hoisting process, and carrying out high-precision installation on the large-span net rack, wherein the installed large-span net rack easily meets the design requirement.

Inventors

LI TENG
YUE YUANLEI
TIAN XIANGQIANG
YU WENLONG
Han tengfei
YUE XIANGPING
CAI GUANGLAI
ZHAO XINGZHU
WU RENQIANG
Qin Hongchang
YIN FEI
ZHANG NING
Si Liangde
XIE XULONG
GUO MIAO

Assignees

中建八局发展建设有限公司

Dates

Publication Date: 20260512
Application Date: 20230609

Claims (8)

1. The high-precision positioning and installing method for the large-span grid structure is characterized by comprising the following steps of: S1, checking the design size and the actual size of the first-section net rack; S2, carrying out primary hoisting and hoisting condition analysis on the first-section net rack; S3, performing high-precision difference adjustment on the first-section net rack; S4, fixedly mounting the first-section net rack; s5, sequentially splicing and installing the subsequent net racks; The specific operation steps for checking the design size and the actual size of the first-section net rack are as follows: Selecting angular points at four corners of the first-stage net rack, finding out specific positions of the four angular points corresponding to a design pattern on a design drawing and specific positions of the four angular points corresponding to an actual first-stage net rack, calculating positions of the four angular points in the design pattern and sizes of the four angular points, measuring the positions of the four angular points in the actual first-stage net rack and the sizes of the four angular points, and adjusting and fixing bolts and nuts on lower spin ball nodes at the four angular points on the first-stage net rack to enable the positions of the four angular points in the actual first-stage net rack and the positions of the four angular points in the design pattern to be identical with each other; The specific operation steps of carrying out preliminary hoisting and hoisting condition analysis on the first-section net rack are as follows: Lifting the first-section net rack to a limit sliding shoe placed at a mounting position on a roof, collecting actual coordinate values of four corner points in the actual first-section net rack through a total station, drawing an actual measurement drawing on a design drawing according to the actual coordinate values, comparing fitting conditions of the actual measurement drawing and the design drawing, and carrying out translation, rotation and other adjustment on the actual measurement drawing on the design drawing to enable two elliptical arcs of the actual measurement drawing to be overlapped with the inner side and the outer side of the design drawing to the greatest extent, so as to obtain fitting coordinate values of the actual measurement drawing under the condition of the greatest overlapping.
2. The method for positioning and installing a large-span grid structure with high precision according to claim 1, wherein the specific operation steps of performing high-precision adjustment on the first-section grid structure are as follows: The method comprises the steps of collecting actual coordinate values of four angular points in an actual first-section net rack in real time through a total station, slowly adjusting the first-section net rack along the axis direction by utilizing a limiting sliding shoe, vertically fine-adjusting the net rack by utilizing a jack, enabling the actual coordinate values to trend to fit the coordinate values, and enabling errors among the actual coordinate values to be finally located in a design requirement error range.
3. The method for positioning and installing a large-span grid structure with high precision according to claim 2, wherein the concrete operation steps of the consolidation installation of the first-stage grid structure are as follows: Lifting the jack, withdrawing the limit sliding shoe, placing a temporary supporting structure between the bottom of the first-section net rack and the top of the installation position, and adjusting the top height of the temporary supporting structure to enable the top height of the temporary supporting structure to be equal to the height of the pre-contact point of the first-section net rack above the temporary supporting structure, wherein the pre-contact point corresponds to the height of the pre-contact point in the design drawing; And lowering the jack to enable the first-section net rack to fall on the temporary supporting structure, checking whether the actual coordinate values of the four corner points of the first-section net rack are the same as the fitting coordinate values, if so, installing a fixed hinge support at the bottom of the first-section net rack to fix the first-section net rack, withdrawing the temporary supporting structure and the jack after fixing, otherwise, lifting the jack, adjusting the top height of the temporary supporting structure again, lowering the jack to enable the first-section net rack to fall on the temporary supporting structure, and checking again.
4. The method for positioning and installing the large-span grid structure with high precision according to claim 3, wherein the specific operation steps of sequentially splicing and installing the subsequent grid structure are that the subsequent grid structure is installed by adopting the same method as the first-section grid structure installation method.
5. The high-precision positioning and mounting method for the large-span grid structure is characterized in that the specific structure of the limiting sliding shoe comprises an I-shaped beam (1), a sliding structure (2), a beam holding structure (3) and a beam holding top plate (4), wherein the beam holding structure (3) is in clamping sliding connection with the upper portion of the I-shaped beam (1), the sliding structure (2) is arranged between the top of the I-shaped beam (1) and the inner top wall of the beam holding structure (3), and the beam holding top plate (4) is fixedly arranged at the top of the beam holding structure (3).
6. The high-precision positioning and mounting method for the large-span grid structure is characterized in that the specific structure of the temporary supporting structure comprises a supporting seat (5) and a gasket (6), wherein the gasket (6) is arranged on the upper portion of the supporting seat (5) in a cushioning mode, a rectangular concave portion is arranged at the top of the supporting seat (5), a rectangular convex portion matched with the rectangular concave portion arranged at the top of the supporting seat (5) is arranged at the bottom of the gasket (6), a rectangular concave portion identical to the rectangular concave portion arranged at the top of the supporting seat (5) is further arranged at the top of the gasket (6), and the supporting seat (5) and a plurality of gaskets (6) are stacked through the rectangular concave portion and the rectangular convex portion in a jogged mode; The support seat (5) is provided with through holes at positions corresponding to the side parts of the gaskets (6), bolts (51) are inserted into the through holes at the side parts of the support seat (5), and the bolts (51) are used for being inserted through the through holes at the side parts of the gaskets (6) to connect the gaskets (6); the side wall of the supporting seat (5) is fixedly provided with a connecting nail (52), and the connecting nail (52) is connected with the bolt (51) through a connecting rope (53).
7. The high-precision positioning and installing method for the large-span grid structure of claim 6, wherein the concrete structure of the lower spin node comprises a lower spin (7), a chord member (8) and a high-strength bolt (9), a sealing plate (82) is arranged inside the end part of the chord member (8), one end of the high-strength bolt (9) is in threaded connection with a threaded hole on the lower spin (7), the other end of the high-strength bolt (9) is in threaded connection with the sealing plate (82), and a hexagonal sleeve (81) is sleeved outside the high-strength bolt (9).
8. The high-precision positioning and mounting method for the large-span grid structure according to claim 7, wherein the specific operation steps of adjusting and fixing bolt nuts on lower turning ball joints at four corner points on a head section frame are that the relative distance between the lower turning ball (7) and a chord member (8) is adjusted through threaded matching of the high-strength bolt (9) and threaded holes on the lower turning ball (7) and threaded matching of the high-strength bolt (9) and the seal plate (82), so that the lower turning ball (7) is in a proper position, adjustment is completed, then a pin is nailed from the hexagonal sleeve (81), so that the hexagonal sleeve (81) and the high-strength bolt (9) are nailed, then one end, close to the lower turning ball (7), of the hexagonal sleeve (81) is welded with the lower turning ball (7), and one end, close to the chord member (8), of the hexagonal sleeve (81) is welded with the lower turning ball (7), so that fixing is completed.

Description

High-precision positioning and mounting method for large-span grid structure Technical Field The invention belongs to the technical field of large-span grid frame installation, and particularly relates to a high-precision positioning and installing method of a large-span grid frame structure. Background The large-span grid structure, as the name implies, refers to a mesh structure that can span a large span. The development of this design results from the pursuit and the demands made on the construction space. Conventional building structures often require a large number of columns and beams to support the building, which not only takes up valuable space, but also affects the aesthetics of the building. The large-span grid structure depends on the unique net structure, so that a building with a larger span can be realized, excessive supports are not needed, the building space is wider and brighter, the pursuit of people on building aesthetics can be better met, meanwhile, the large-span grid structure has the advantages of high strength, energy conservation, environmental protection, flexibility, changeability and convenience in maintenance, and the large-span grid structure is a building structure form with high application value and development prospect and can be widely applied and popularized in the future. The steel structure material is widely applied to the large-span roof structure due to the small-quality structural stability, but various overrun large-span structures gradually appear along with the continuous development of the building structure in China, so that the comprehensive deformation of the steel structure caused by the factors such as temperature, span and the like when the large-span roof is applied causes that the assembly progress hardly meets the design precision requirement when the large-span net frame is assembled. The existing construction technology for large-span grid structure construction mainly relies on a total station to correct when the grid is hoisted so as to control the precision when adjacent grids are spliced. Meanwhile, the steel structure net frame is large in radian change during installation due to large span, and the steel structure can deform due to material performance during blanking and installation and after load application, so that the deviation between the roof structure net frame and design and lofting construction is large due to various factors, and finally, the splicing error precision of the steel structure net frame serving as a main bearing structure during hoisting and splicing is difficult to control within the design requirement. Disclosure of Invention In view of the above, the high-precision positioning and mounting method for the large-span grid structure provided by the invention can be used for mounting the large-span grid with high precision, and the mounted large-span grid is easy to meet the design requirement. The invention is realized in the following way: the invention provides a high-precision positioning and installing method of a large-span grid structure, which comprises the following steps: S1, checking the design size and the actual size of the first-section net rack; S2, carrying out primary hoisting and hoisting condition analysis on the first-section net rack; S3, performing high-precision difference adjustment on the first-section net rack; S4, fixedly mounting the first-section net rack; s5, splicing and installing the subsequent net racks in sequence. On the basis of the technical scheme, the high-precision positioning and mounting method of the large-span grid structure can be further improved as follows: the specific operation steps for checking the design size and the actual size of the first-section net rack are as follows: The method comprises the steps of selecting angular points at four corners of a first-stage net rack, finding out specific positions of the four angular points corresponding to a design pattern on a design drawing and specific positions corresponding to an actual first-stage net rack, calculating positions of the four angular points in the design pattern and sizes of the four angular points, measuring the positions of the four angular points in the actual first-stage net rack and the sizes of the four angular points, and adjusting and fixing bolts and nuts on lower spin ball nodes at the four angular points on the first-stage net rack to enable the positions of the four angular points in the actual first-stage net rack and the positions of the four angular points in the design pattern to be identical to each other in driving size. The first section large-span net rack realizes that net rack actual size corrects in design size before hoisting and provides necessary premise for subsequent net rack hoisting high-precision installation. Further, the specific operation steps of carrying out preliminary hoisting and hoisting condition analysis on the first-section net rack are as follows: Lifting the fi