CN-117386138-B - Construction method of open web steel truss with conjoined structure between towers

CN117386138BCN 117386138 BCN117386138 BCN 117386138BCN-117386138-B

Abstract

The invention discloses a construction method of a connected structure hollow steel truss between towers, which comprises the steps of S1, reserving brackets according to the number of truss chord layers at the installation positions of towers on two sides before truss installation, S2, preparing horizontal chords, diagonal web members and straight web members of the trusses on a ground platform, S3, synchronously assembling the hollow steel trusses from the towers on two sides to the middle, paving pedals on the horizontal chords of each section after the installation, and assembling the horizontal chords of the next section forwards by taking the pedals as a construction platform, wherein the outer ends of the horizontal chords are tied with an upper structure through diagonal braces.

Inventors

YANG XIAOMENG
SONG ZHIYUN
CHEN YUE
Qiao Gun
WANG SHUCHAO
XU HAOXI
JIANG HONGRAN

Assignees

杭萧钢构（河北）建设有限公司
北京建工集团有限责任公司

Dates

Publication Date: 20260512
Application Date: 20231027

Claims (4)

1. A construction method of a hollow steel truss with a conjoined structure between towers is characterized by comprising the following steps: S1, reserving corbels according to the number of layers of truss chords at installation positions of tower buildings at two sides before truss installation; s2, preparing a horizontal chord member, an inclined web member and a straight web member of the truss on a ground platform; S3, synchronously splicing the hollow steel trusses from tower buildings at two sides to the middle, paving pedals on the horizontal chord members of each section after the horizontal chord members are installed, splicing the horizontal chord members of the next section forwards by taking the pedals as a construction platform, and pulling the outer ends of the horizontal chord members to the upper structure through diagonal tension rods, wherein the splicing process of the trusses is as follows, The method comprises the steps of firstly, hoisting a first layer of first section horizontal chords to a mounting position, fixing the first layer of first section horizontal chords with a first layer of bracket under the condition of hoisting, and then paving pedals on the first layer of first section horizontal chords; Hoisting a first layer of first section diagonal web members, wherein the lower end of the first layer of first section diagonal web members is fixed with the outer suspension end of the first layer of first section horizontal chords, and the upper end of the first layer of first section diagonal web members is fixed with a second layer of corbels; Third, before the first layer second section horizontal chord member is installed, ① is used for fixing the second layer first section horizontal chord member and the second layer bracket according to the first step, ② is used for installing the second layer first section diagonal web member according to the second step, ③ is used for installing the first layer first section straight web member, ④ is used for installing the first layer second section horizontal chord member and the first layer second section diagonal web member; Step four, the hollow steel truss is pushed to the middle for assembly according to the step three, before a next horizontal chord member of a certain layer is pre-installed, a previous horizontal chord member of the upper layer and a previous diagonal web member of the upper layer are installed, then a previous straight web member of the layer is installed, finally the horizontal chord member is installed, and the outer suspension end of the horizontal chord member and the previous horizontal chord member of the upper layer are tied by using the diagonal web member; Step five, reserving a rear loading section when the distance between the steel trusses at the two sides is smaller than the length of the horizontal chord members, hoisting the horizontal tie connecting rods into the rear loading section after all the layers of the steel trusses at the two sides are assembled, and connecting the horizontal chord members at the two layers of the rear loading section by using the horizontal tie connecting rods; And sixthly, gradually dismantling the temporary diagonal braces from the middle to two sides of the steel truss so as to gradually stress the steel truss body.
2. The construction method of the conjoined structure hollow steel truss between towers according to claim 1, wherein the arch camber value of each chord member is determined by structural calculation before the steel truss is installed, and the outer suspension end of each horizontal chord member is fixed in an upward inclination manner by referring to the data determined by calculation, so that the chord member positions outside the trusses on two sides are positioned at the positions required by design calculation after final installation.
3. The construction method of the conjoined structure hollow steel truss between towers according to claim 1, wherein a proper air temperature environment is selected, and a horizontal drawknot connecting rod is installed to perform folding construction of the steel trusses at two sides.
4. The construction method of the conjoined structure hollow steel truss between towers according to claim 1, wherein the permanent horizontal chord members, the diagonal web members and the straight web members are firstly fixed by bolts in the assembling process, then are welded and fixed after the angle is adjusted according to the arching value requirement, and the two ends of the temporary diagonal pull rods are fixed by detachable bolts.

Description

Construction method of open web steel truss with conjoined structure between towers Technical Field The invention relates to the technical field of high-altitude bridge installation, in particular to a construction method of a conjoined structure hollow steel truss between towers. Background In the prior art, a connected structure is commonly designed between two buildings, so that the two buildings are communicated with each other to realize better intercommunication of pedestrians, and meanwhile, the connected structure has a unique appearance, so that a strong visual effect is brought to the building, and the building is more special. The conjoined structure is generally supported by a steel structure as a main body, and then a concrete structure, a decorative structure and the like are constructed on the steel structure, so that a building structure which is integrated with the main body structures at two sides in a mixing way is formed in appearance. The body support of the conjoined structure is generally a common steel truss, a hollow steel truss structure or a mixed steel truss structure. The span of the conjoined steel truss is generally about 10 meters to 30 meters, and middle struts are generally required to be arranged beyond the span. The conjoined steel truss comprises a plurality of truss connecting rods in the height direction, and the hollow truss consists of a plurality of layers and a plurality of truss drawknot rod pieces. The connection mode with the towers on two sides is rigid connection, hinged connection, sliding connection and elastic connection. The invention mainly aims at the construction of the steel truss which can be directly connected. The existing construction method of the high-altitude connector structure generally adopts a method of integrally assembling the ground and integrally lifting by hydraulic equipment, and the mounting mode has the defects that 1) the ground of the connecting structure is integrally assembled, the load is large, large lifting equipment is required to be put into, the large lifting equipment is high in price and high in construction cost, 2) the high-altitude lifting of the structure is difficult to implement translational positioning and is generally vertical to lift, so that the connected structure is generally assembled on a platform right below a mounting position, the lower part of the building design is mostly provided with an overhanging structure, the vertical lifting is protected, the lower part of the building design is often assembled on a skirt house roof, the bearing capacity of the skirt house face is limited, and only the supporting structure is arranged below the skirt house face to be jacked, thereby increasing the construction measure cost. Disclosure of Invention The invention aims to solve the problems of large investment of the traditional steel truss installation equipment with the conjoined structure, large auxiliary temporary construction workload outside the conjoined structure and long construction period, thereby providing a construction method of the conjoined structure hollow steel truss between towers. The invention solves the problems, and adopts the following technical scheme: a construction method of a connected structure hollow steel truss between towers comprises the steps of S1, reserving corbels according to the number of truss chord layers at installation positions of towers on two sides before installation of the truss, S2, preparing horizontal chords, diagonal web members and straight web members of the truss on a ground platform, S3, synchronously assembling the hollow steel truss from the towers on two sides to the middle, paving pedals on the horizontal chords of each section after installation, and assembling the horizontal chords of the next section forwards by taking the pedals as a construction platform, wherein the outer ends of the horizontal chords are tied with an upper structure through the diagonal chords. Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that: The invention uses each rod as unit to implement hoisting installation, and the small lifting equipment can meet the construction, and compared with the existing construction, the construction investment is greatly reduced. Preferably, the steel truss is assembled by the following steps, The method comprises the steps of firstly, hoisting a first layer of first section horizontal chords to a mounting position, fixing the first layer of first section horizontal chords with a first layer of bracket under the condition of hoisting, and then paving pedals on the first layer of first section horizontal chords; Hoisting a first layer of first section diagonal web members, wherein the lower end of the first layer of first section diagonal web members is fixed with the outer suspension end of the first layer of first section horizontal chords, and the upper end of the first layer of firs