CN-119860098-B - Construction method of large-span truss steel structure roof

CN119860098BCN 119860098 BCN119860098 BCN 119860098BCN-119860098-B

Abstract

The invention discloses a construction method of a large-span truss steel structure roof, which comprises the following steps of 1, finishing roof assembly on a floor slab, fixing an outer ear plate of a joint shaft node to the roof, 2, lifting the roof upwards by a lifting system, removing an assembly jig frame after the roof is lifted to a first height, 3, inserting an inner ear plate of the joint shaft node fixed at the end part of a bifurcation column between the outer ear plates of the joint shaft node, inserting a pin shaft into a pin shaft hole on the ear plate, 4, gradually lifting the roof, adjusting the bifurcation column from an inclined posture to a vertical posture in the lifting process, continuously lifting the roof to a designed height, and 5, adjusting the posture of the bifurcation column, and connecting the lower end of the bifurcation column and the top of a support column. The method solves the problems that the installation of the joint shaft of the bifurcation column is difficult, the bifurcation column cannot be hoisted in place in a narrow space in high altitude, and the high altitude assembly difficulty of the pin shaft of the joint shaft of the bifurcation column is high.

Inventors

LI HAIWEN
SUN PENGFEI
WU CHUANG
HAO HAILONG
LI JIAN
HE XU
JIA YONGXIN
NIU TIANWEI

Assignees

中建二局安装工程有限公司
北京城建集团有限责任公司
中建二局河北建设有限公司

Dates

Publication Date: 20260512
Application Date: 20250124

Claims (5)

1. The construction method of the large-span truss steel structure roof is characterized by comprising the following steps of: in the step 1, the joint shaft node external ear plate is fixed to the roof in a welding mode, and a portable hole milling machine is used for milling holes of pin shafts of the joint shaft node external ear plate after welding is finished, so that the pin shaft holes of the external ear plate are not concentric due to welding deformation, and the pin shaft assembly requirement is met; Step2, lifting the roof upwards by using a lifting system, and removing the assembled jig after the roof is lifted to a first height; The method comprises the specific processes of coating butter on the joint shaft node external ear plate and the joint shaft node internal ear plate, obliquely hoisting the branch column by using a chain block to match a crane, inserting the joint shaft node internal ear plate between the joint shaft node external ear plates, inserting a pin shaft from the pin shaft hole of one side joint shaft node external ear plate, arranging the ear plate at the pin shaft end part inserted into the pin shaft hole, connecting the pin shaft with the ear plate by using a steel wire rope, connecting the other end of the steel wire rope with a first chain block, adjusting the tensioning force of the first chain block, and shaking the pin shaft to enable the pin shaft to slowly pass through the pin shaft hole; Step 4, gradually lifting the roof, and adjusting the bifurcation post from an inclined posture to a vertical posture in the lifting process, and continuously lifting the roof to a designed height, wherein the specific process in step 4 is that a lifting system loads the roof step by step according to the sequence of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the designed load, and lifts the roof upwards; And 5, adjusting the posture of the bifurcation column and connecting the lower end of the bifurcation column with the top of the support column.
2. The construction method of the large-span truss steel structure roof according to claim 1, wherein a temporary stay is provided between two adjacent joint outer ear plates before finish milling the pin holes of the joint outer ear plates.
3. The construction method of the large-span truss steel structure roof according to claim 1, wherein the end part of the joint shaft node pin shaft is subjected to inverted arc angle treatment.
4. The construction method of the long-span truss steel structure roof according to claim 1, wherein the specific process of the step 2 is that a lifting system is loaded step by step according to the sequence of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of design load until the roof is separated from a jig, lifting is suspended after the roof is lifted to a height of 5cm to 30 cm and is kept for 2 hours to 24 hours, whether the roof and the lifting system are abnormal or not is continuously observed during the standing period, and the roof is lifted to a first height and the spliced jig is removed after the standing is completed and the abnormal condition is not detected.
5. The method of constructing a long span truss steel structural roof as recited in claim 1, further comprising the step of removing the lift system after step 5 is completed.

Description

Construction method of large-span truss steel structure roof Technical Field The invention belongs to the technical field of steel structure building construction, and particularly relates to a construction method of a large-span truss steel structure roof. Background With the development of science and technology, the application of steel structure buildings on super high-rise and large-span buildings is mature, and the steel structure buildings become the mainstream building technology gradually, and are the development direction of future buildings. With the continuous improvement of the pursuit of building aesthetics, in some large-span industrial and civil buildings, the slope roof modeling of the Chinese ancient building, the steel structure roof with large curvature and inclined curved surface shape, the roof skylight and the bifurcation post are widely adopted, the steel roof has large span and multiple height changes, the roof skylight and the bifurcation post at the lower part have complex structures, and great challenges are brought to the installation of the steel roof and the bifurcation post. At present, a large-span steel structure roof and a bifurcation column are constructed by lifting and installing the steel roof, and hoisting and embedding the bifurcation column. The method can avoid high-altitude assembly operation to a great extent, but has the defects of high difficulty in construction of lifting and embedding of the bifurcation columns, difficult guarantee of construction quality and difficult suitability for the situation that the bifurcation columns are limited to be lifted by lifting frames in narrow places in buildings or in roof supporting positions, and the other method is that the bifurcation columns are preferentially installed in place, and the roof and the bifurcation columns are interfered by each other when being arranged in a steel roof construction and then are installed after the bifurcation columns are thrown. The method includes that a main stress rod of the steel roof cannot be assembled, a large number of temporary rods are needed to reinforce the original roof structure, after the steel roof is lifted in place, roof rods of the throwing item are installed, and then the temporary reinforcing rods are removed. The construction method not only can increase the construction cost of temporary facilities, but also can increase potential safety hazards and a large number of temporary reinforcing rods, and is not beneficial to the adjustment of the space position when the steel structure is assembled. Disclosure of Invention The invention aims to provide a construction method of a large-span truss steel structure roof, which aims to solve the technical problems in the construction of the steel structure roof and bifurcation columns. The technical scheme for solving the technical problems is as follows, the construction method of the large-span truss steel structure roof comprises the following steps: Step1, finishing roof assembly on a floor slab surface, wherein an outer ear plate of a joint shaft node is fixed to the roof; Step2, lifting the roof upwards by using a lifting system, and removing the assembled jig after the roof is lifted to a first height; Step 3, inserting an inner ear plate of a joint shaft node fixed at the end part of the bifurcation post between the outer ear plates of the two joint shaft nodes, and inserting a pin shaft into a pin shaft hole on the ear plate; step 4, gradually lifting the roof, and adjusting the bifurcation post from an inclined posture to a vertical posture in the lifting process; And 5, adjusting the posture of the bifurcation column and connecting the lower end of the bifurcation column with the top of the support column. In the construction method of the large-span truss steel structure roof, preferably, in the step 1, the outer ear plates of the joint shaft nodes are fixed to the roof in a welding mode, after welding, a portable hole milling machine is used for milling holes of pin shaft holes of the outer ear plates of the joint shaft nodes, and the phenomenon that the pin shaft holes of the outer ear plates are not concentric due to welding deformation is eliminated, so that the requirement of pin shaft assembly is met. According to the construction method of the large-span truss steel structure roof, preferably, before finish milling is carried out on the pin shaft holes of the outer ear plates of the joint shaft nodes, temporary supporting rods are arranged between two adjacent outer ear plates of the joint shaft nodes. According to the construction method of the large-span truss steel structure roof disclosed by the invention, preferably, the end part of the joint shaft node pin shaft is subjected to arc chamfering. The construction method of the large-span truss steel structure roof is characterized in that the construction method comprises the specific process of step 2, namely, a lifting system is loaded step by step ac