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CN-121575683-B - Super-large span bridge open type bearing frame, support and construction method

CN121575683BCN 121575683 BCN121575683 BCN 121575683BCN-121575683-B

Abstract

The invention provides an oversized span bridge open type bearing frame, a support and a construction method, which solve the problems that in the prior art, a bridge support cannot simultaneously meet the requirements of large spans on vertical support and transverse support, poor stability and incapability of achieving both assembly efficiency and construction difficulty, and comprise a vertical support structure, wherein the vertical support structure comprises two first embedded parts and second embedded parts which are respectively embedded in pier bearing platforms at two sides, the bottom ends of the first embedded parts are respectively fixedly connected with two vertical rods, two groups of horizontal diagonal support supports and a middle cross rod, the horizontal diagonal support is a V-shaped support formed by fixing one ends of the side cross rods and the diagonal support, an upper four-way pipe and a lower four-way pipe are arranged in the middle of the diagonal support, two ends of the middle cross rod are respectively connected with the horizontal diagonal support at two sides, the middle cross rod is flush with the side cross rods at two sides, and the transverse load sharing structure comprises a truss and two groups of upper and lower connecting pipes.

Inventors

  • ZHANG JULIAN
  • DONG XIAOMING
  • NI MING

Assignees

  • 广州宏途设备工程有限公司

Dates

Publication Date
20260512
Application Date
20260129

Claims (8)

  1. 1. An oversized span bridge open load frame for providing support for a bridge structure between two oversized span piers (10) during a bridge construction phase, comprising: The vertical support structure (1) comprises two first embedded parts (11) and second embedded parts (12) which are respectively embedded in bearing platforms (101) at two sides of a pier (10), two vertical rods (13), two groups of horizontal diagonal support frames (14) and a middle cross rod (15) which are fixedly connected with the first embedded parts (11) at the bottom end, wherein the horizontal diagonal support frames (14) are V-shaped frames formed by fixing one ends of side cross rods (141) and diagonal rods (142), the other ends of the side cross rods (141) are fixed with the tops of the corresponding vertical rods (13), the other ends of the diagonal rods (142) are fixed with the corresponding second embedded parts (12), the openings of the V-shaped frames face the corresponding vertical rods (13) and the side cross rods (141) are horizontally arranged, and an upper four-way pipe (143) and a lower four-way pipe (144) are arranged in the middle of the diagonal rods (142), and the two ends of the middle cross rods (15) are respectively connected with the horizontal diagonal support frames (14) at two sides and are flush with the cross rods (141) at two sides; The transverse load sharing structure (2) comprises a truss (23) and two groups of upper connecting pipes (21) and lower connecting pipes (22), wherein one ends of the upper connecting pipes (21) and the lower connecting pipes (22) are fixed with the vertical rods (13), the other ends of the upper connecting pipes and the lower connecting pipes are respectively connected with one horizontal ends of the upper four-way pipes (143) and the lower four-way pipes (144), the truss (23) comprises an upper chord member (231), a lower chord member (232) and a tie rod assembly (233) arranged between the upper chord member (231) and the lower chord member (232), two ends of the upper chord member (231) are respectively connected with the other horizontal ends of the upper four-way pipes (143) on two sides and are flush with the upper connecting pipes (21) on two sides, and two ends of the lower chord member (232) are respectively connected with the other horizontal ends of the lower four-way pipes (144) on two sides and are flush with the lower connecting pipes (22) on two sides; The tie bar assembly (233) comprises a plurality of vertical tie bars (233 a) and diagonal tie bars (233 b) which are arranged between the upper chord member (231) and the lower chord member (232) in a staggered manner, and both ends of the vertical tie bars (233 a) and the diagonal tie bars (233 b) are respectively fixed on the upper chord member (231) and the lower chord member (232); The tie bar assembly (233) further comprises a plurality of groups of right-angle hoops (233 c) and oblique-angle hoops (233 d) which are arranged in pairs, wherein two ends of the right-angle hoops (233 c) are arranged at two ends of the vertical tie bar (233 a) and are respectively fixed with the upper chord member (231) and the lower chord member (232), and the oblique-angle hoops (233 d) are arranged at two ends of the oblique tie bar (233 b) and are respectively fixed with the upper chord member (231) and the lower chord member (232).
  2. 2. The ultra-large span bridge open type bearing frame as set forth in claim 1, wherein the horizontal diagonal support (14) further comprises a three-way pipe (145), one end of the side cross rod (141) and one end of the diagonal rod (142) are fixedly connected through the three-way pipe (145), and two ends of the middle cross rod (15) are respectively and fixedly connected with the three-way pipes (145) on two sides.
  3. 3. The ultra-large span bridge open type bearing frame as set forth in claim 1, wherein said horizontal diagonal brace bracket (14) further comprises a tip (146) disposed at the other end of said diagonal rod (142), said diagonal rod (142) being connected to said second embedded part (12) through the tip (146).
  4. 4. The open-span bridge girder as claimed in claim 1, wherein the middle part and the top of the vertical bar (13) are fixed with the bridge pier (10) through a connecting piece (3).
  5. 5. An ultra-large span bridge stent, comprising: a plurality of groups of the oversized span bridge open-type bearing frames according to any one of claims 1 to 4, wherein the plurality of groups of the oversized span bridge open-type bearing frames are arranged in parallel between two piers (10); The plurality of connecting rods (4) are connected with each other through the connecting rods (4) between every two adjacent ultra-large span bridge open type bearing frames; The support structure is fixedly arranged on the plurality of groups of open-type bearing frames of the ultra-large span bridge and is used for supporting the bridge body.
  6. 6. The ultra-large span bridge support of claim 5, wherein the supporting structure comprises a bailey beam (8), a distribution beam (9) and a plurality of spandrel girders (7), wherein the spandrel girders (7) are uniformly arranged on the ultra-large span bridge open type bearing frame, the bailey beam (8) is arranged on the spandrel girders (7), and the distribution beam (9) is arranged on the bailey beam (8).
  7. 7. The ultra-large span bridge bracket as set forth in claim 5, wherein the upper ends of the vertical rods (13) of the two ultra-large span bridge open type bearing frames on the outer sides are provided with splayed struts (131) and diagonal bracing tubes (132), the diagonal bracing tubes (132) are fixed on the outer supporting ends of the splayed struts (131) which are arranged upwards, and the diagonal bracing tubes (132) extend towards the outer sides of the ultra-large span bridge open type bearing frames for sharing loads.
  8. 8. A construction method of an ultra-large span bridge stent for constructing the ultra-large span bridge stent of any one of claims 5 to 7, comprising: The method for constructing the ultra-large span bridge open type bearing frame comprises the steps of firstly installing a first embedded part (11) and a second embedded part (12) before construction of bearing platforms (101) where two bridge piers (10) are located, then respectively arranging vertical rods (13) on the two bearing platforms (101) after the construction of the bridge piers (10) is completed, fixing the bottoms of the vertical rods (13) with the first embedded part (11), then preassembling two horizontal diagonal support brackets (14), hoisting the assembled horizontal diagonal support brackets (14), fixing the other end of a side cross rod (141) with the top of the vertical rods (13), fixing the other end of a diagonal rod (142) with the second embedded part (12), then horizontally hoisting a middle cross rod (15), respectively connecting two ends of the middle cross rod (15) with the horizontal diagonal support brackets (14) on two sides, keeping the middle cross rod (15) flush with the side cross rods (141) on two sides, then horizontally hoisting an upper connecting pipe (21) and a lower connecting pipe (22), respectively connecting the upper end and the lower end of the four-way pipe (21) with the upper connecting pipe (144) and the lower connecting pipe (144), connecting two ends of the upper chord member (231) with the other horizontal ends of the upper four-way pipes (143) on two sides respectively, connecting two ends of the lower chord member (232) with the other horizontal ends of the lower four-way pipes (144) on two sides respectively, and finally hoisting a plurality of tie rod assemblies (233) between the upper chord member (231) and the lower chord member (232); Repeating the steps to build at least two oversized span bridge open type bearing frames, wherein the adjacent two oversized span bridge open type bearing frames are connected through a plurality of connecting rods (4); and erecting a supporting structure on the oversized span bridge open type bearing frame.

Description

Super-large span bridge open type bearing frame, support and construction method Technical Field The invention relates to the technical field of temporary support of bridge engineering, in particular to an ultra-large span bridge open type bearing frame, a support and a construction method. Background In the field of bridge engineering, ultra-large span bridges become a core choice for traffic infrastructure construction because of being capable of crossing complex geographic barriers. In the construction stage of the bridge, the bridge body structure (especially the cantilever casting or support cast-in-situ beam body) needs to depend on the temporary support to bear multiple acting forces such as self weight, concrete casting load, construction machinery live load, wind load and the like before forming an integral stress system. The performance of the temporary support bracket directly determines construction safety, engineering progress and final quality of the bridge body. Along with the development of bridge engineering to larger span, more complicated topography and higher construction precision, the technical defects of the existing temporary support bracket are increasingly prominent, and the construction requirements of the ultra-large span bridge cannot be met, which is specifically shown as follows: 1. insufficient adaptability of ultra-large span and disturbance of load transmission path The traditional truss type or beam column type bracket has the core limitation that the span and the rigidity of a single structure are difficult to be simultaneously realized, when the span exceeds 40 meters, the deflection of a cross beam of the traditional bracket is easy to exceed the construction allowable range, and the vertical support and the transverse support are lack of cooperative design. For example, the vertical upright posts of the traditional support only bear vertical loads, the transverse trusses only bear horizontal loads, and an integrated load transmission system is not formed between the vertical trusses and the horizontal trusses, so that eccentric loads (such as unbalanced concrete pouring) and lateral wind loads in construction cannot be transmitted to the piers on two sides through reasonable paths, and local rod pieces (such as middle cross beams and vertical upright posts) are severely concentrated in stress. 2. Poor fixing reliability with the pier bearing platform and weak anti-slip and anti-pulling capacity The dead weight of the ultra-large span bracket (the dead weight of a single bracket often reaches hundreds of tons) and the construction load can generate huge vertical pressure and horizontal thrust, and the requirement on the connection strength of the bracket and the pier foundation is extremely high. The existing bracket is mainly formed by adopting a mode of 'ground embedded steel plates and upright post welding' or 'simple anchor bolt fixing', and is not integrally fixed with a pier bearing platform, wherein the ground embedded steel plates are easy to slip due to geological settlement and soil lateral displacement, the anti-pulling capability of the simple anchor bolts is limited, horizontal thrust under ultra-large span cannot be resisted, the integral displacement of the bracket can be possibly caused, and further the accuracy of bridge body steel bar binding and concrete pouring is influenced, and even safety accidents are caused. 3. The structure modularization degree is low, and the construction efficiency and the economical efficiency are poor The existing ultra-large span support is mainly of a customized welding structure, connection among the rods is mainly of on-site welding, and prefabrication degree is extremely low, on one hand, quality of welding joints is greatly influenced by construction environments (such as temperature and humidity), slag inclusion, incomplete welding and the like are easy to occur, the rods are difficult to recycle after disassembly, material waste is caused, on the other hand, hoisting of the integral structure is required to depend on ultra-large hoisting equipment (such as a crane with the weight of more than 500 tons), prefabrication, transportation and hoisting periods are long (the construction period of a single support is usually 1-2 months), and the requirement of 'quick construction and construction period shortening' of bridge engineering cannot be met. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an open-type bearing frame, a support and a construction method for an ultra-large span bridge, which solve the problems that in the prior art, the bridge support cannot simultaneously satisfy the vertical support and the lateral support required by the large span, the stability is poor, and the assembly efficiency and the construction difficulty cannot be considered. In order to solve the above technical problems, the present invention provides an oversized