CN115030060B - Porous continuous steel truss cantilever assembling construction method - Google Patents
Porous continuous steel truss cantilever assembling construction method Download PDFInfo
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- CN115030060B CN115030060B CN202210691341.2A CN202210691341A CN115030060B CN 115030060 B CN115030060 B CN 115030060B CN 202210691341 A CN202210691341 A CN 202210691341A CN 115030060 B CN115030060 B CN 115030060B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 274
- 239000010959 steel Substances 0.000 title claims abstract description 274
- 238000010276 construction Methods 0.000 title claims abstract description 73
- 230000008093 supporting effect Effects 0.000 claims abstract description 104
- 238000000034 method Methods 0.000 claims description 14
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000036544 posture Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention provides a construction method for splicing porous continuous steel truss girder cantilevers, which belongs to the technical field of steel truss construction and comprises the following steps: the first temporary supporting structures are arranged on two sides of the middle pier, the first temporary supporting structures and the middle pier are combined to form an assembly platform, the first section of steel truss girder is assembled at the upper end of the assembly platform, the second temporary supporting structures are erected, the second section of steel truss girder is assembled in a cantilever mode along the extending direction of the first section of steel truss girder, the jacks are arranged at the upper ends of the second temporary supporting structures, the postures of the second section of steel truss girder are adjusted, and the steel truss girder is assembled symmetrically from the middle to the two sides. According to the multi-hole continuous steel truss cantilever assembling construction method provided by the invention, two working surfaces are used simultaneously, the temporary supporting structure is used repeatedly, the number and cost of erection are reduced, the steel truss can be overlapped with the bridge pier without changing along with the environmental temperature, the conventional trestle and crawler crane are matched for assembling construction, and the assembling construction progress and efficiency are improved.
Description
Technical Field
The invention belongs to the technical field of steel truss construction, and particularly relates to a multi-hole continuous steel truss cantilever assembling construction method.
Background
At present, in the construction process of splicing the porous continuous steel truss cantilever, a temporary supporting structure needs to be fully distributed below the steel truss, and the temporary supporting structure and a plurality of piers are matched for construction, so that the supporting effect of erecting the steel truss is achieved, the steel truss is erected at the upper ends of the piers, and then the temporary supporting structure is completely dismantled. The main defects existing in the steel truss girder construction process are as follows: the installation of the steel truss girder is sequentially constructed along the arrangement direction of a plurality of piers, and the steel truss girder is subjected to expansion with heat and contraction with cold due to environmental changes, so that the connection position of the steel truss girder and the pier support is easy to change, the steel truss girder is not overlapped with the pier support, and the stability of the whole structure of the steel truss girder is difficult to ensure; and because the temporary supporting structures are erected in a large number, the construction cost is increased.
Disclosure of Invention
The invention aims to provide a construction method for splicing a cantilever of a porous continuous steel truss girder, which aims to solve the technical problems that the cantilever is easy to overlap and misplace with a pier support during the construction of the steel truss girder, and the structural stability of the steel truss girder is low.
In order to achieve the above purpose, the invention adopts the following technical scheme: the construction method for splicing the porous continuous steel truss girder cantilever comprises the following steps:
the bridge pier positioned in the middle along the arrangement direction of the bridge piers is defined as a middle pier, first temporary supporting structures are erected on two sides of the middle pier, and the two first temporary supporting structures and the middle pier are combined to form an assembly platform;
A first section of steel truss girder is erected on the assembly platform, and the first section of steel truss girder is sequentially erected from the middle part to the two ends;
Respectively erecting second section steel trusses at two ends of the first section steel trusses along the extending direction of the first section steel trusses, wherein the second section steel trusses are assembled in a cantilever mode; the piers extending from the middle pier to the two sides of the middle pier are sequentially defined as a first pier, a second pier and a third pier;
A second temporary supporting structure is erected between the middle pier and the pier I, and the middle position of the second section of steel truss girder is connected to the upper end of the second temporary supporting structure in a lap joint mode;
a jack is arranged at the upper end of the second temporary supporting structure, so that the upper end of the jack is connected with and jacks up the second section of steel truss girder, the posture of the second section of steel truss girder is adjusted, and the cantilever end is lapped to the upper end of the first pier;
dismantling the first temporary supporting structure and erecting between the first pier and the second pier;
Assembling a third section of steel truss girder in a cantilever manner along the extending direction of the second section of steel truss girder, enabling the middle position of the third section of steel truss girder to be connected to the upper end of the first temporary supporting structure in a lap joint mode, arranging a jack at the upper end of the first temporary supporting structure, lifting the third section of steel truss girder, adjusting the posture of the third section of steel truss girder, and enabling the cantilever end to be connected to the upper end of the second pier in a lap joint mode;
And dismantling the second temporary supporting structure, erecting between the second bridge pier and the third bridge pier, erecting a fourth section of steel truss girder and adjusting the posture, and sequentially performing cyclic construction according to the steps to finish the construction of the porous continuous steel truss girder.
In one possible implementation manner, when the first temporary supporting structure or the second temporary supporting structure is removed, a jack is arranged at the upper end of the first temporary supporting structure or the upper end of the second temporary supporting structure and correspondingly lifts the first section steel truss girder or the second section steel truss girder, a part connected between the first temporary supporting structure and the first section steel truss girder is removed, or a part connected between the second temporary supporting structure and the second section steel truss girder is removed, so that the first temporary supporting structure or the second temporary supporting structure is removed after the jack is retracted.
In one possible implementation manner, when the second temporary supporting structure is first erected, the height of the second temporary supporting structure is smaller than that of the first temporary supporting structure, and the middle position of the second section steel truss girder is connected to the upper end of the second temporary supporting structure in a lap joint mode.
In one possible implementation manner, the cantilever end of the second section steel truss girder or the third section steel truss girder or the fourth section steel truss girder is respectively close to the first bridge pier or the second bridge pier or the third bridge pier.
In one possible implementation manner, the first temporary supporting structure and the second temporary supporting structure each comprise a supporting structure foundation, a lower bolster, a standard member, an upper bolster, a longitudinal beam and a plurality of layers of steel plates which are sequentially arranged from bottom to top, wherein the steel plates are used for correspondingly supporting the first section steel truss girder or the second section steel truss girder or the third section steel truss girder or the fourth section steel truss girder.
In one possible implementation manner, when the first temporary supporting structure or the second temporary supporting structure is removed, a jack is arranged at the upper end of the longitudinal beam, the jack is enabled to lift the first section of steel truss girder or the second section of steel truss girder or the third section of steel truss girder or the fourth section of steel truss girder, at least one layer of steel plate is pulled out after lifting, the jack is retracted, and the first temporary supporting structure or the second temporary supporting structure is removed.
In one possible implementation, the upper end of the middle pier is provided with a fixed support, and the upper ends of the piers positioned on two sides of the middle pier are provided with movable supports.
In one possible implementation, the first temporary supporting structure and the second temporary supporting structure may be constructed by matching a trestle installed below the steel truss with a crawler crane disposed on the trestle.
In one possible implementation manner, the assembling construction steps of the first section of steel truss girder include:
The middle part of the first section steel truss girder is symmetrically assembled from the middle part to the two ends in sequence according to the sequence of the lower chord member, the web member and the upper chord member, and a closed triangle stable structure is formed inside the first section steel truss girder after the assembly.
In one possible implementation, the supporting structure foundation includes a plurality of steel pipe piles driven into the ground and a connecting piece for connecting the plurality of steel pipe piles, and the plurality of steel pipe piles are laid to form a stable structure in a shape of a Chinese character 'tian'.
The porous continuous steel truss cantilever assembling construction method provided by the invention has the beneficial effects that: compared with the prior art, the construction method for splicing the multi-hole continuous steel truss cantilever has the advantages that the steel truss cantilever is spliced from the middle pier to the two sides in a symmetrical manner, one working surface is changed into two working surfaces, the construction progress and efficiency are improved, the first temporary supporting structure and the second temporary supporting structure are mutually matched for construction and can be recycled, the number and cost of the temporary supporting structures are reduced, the steel truss is not changed along with the environmental temperature, the conventional trestle and crawler crane are matched for splicing construction, and the splicing construction progress is improved.
Firstly, the difficult problem that the temporary construction platform is difficult to set in steel truss assembly construction is solved, an assembly platform is jointly formed by the temporary support structure and the bridge pier, and after the assembly construction of the first section of steel truss is completed, the next section of steel truss can be assembled continuously in a symmetrical mode, so that the operation is convenient and safe.
And secondly, the problem that the steel truss girder is longitudinally stretched and contracted due to temperature stress in the assembling process and cannot be lapped with the pier support is solved.
And the temporary supporting structure can be recycled, so that the situation that the temporary supporting structure is fully distributed below the steel truss is avoided, the construction cost is not required to be increased, the engineering cost is reduced, and the posture of the steel truss can be adjusted through the jack, so that the steel truss is convenient and quick.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a pier position and a temporary support structure of a construction method for splicing porous continuous steel truss cantilever according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a layout mode of a supporting structure foundation overlooking structure of a multi-hole continuous steel truss cantilever assembling construction method provided by the embodiment of the invention;
FIG. 3 is a schematic diagram of a trestle and crawler crane construction structure used in combination with the porous continuous steel truss cantilever assembly construction method provided by the embodiment of the invention;
FIG. 4 is a schematic structural view of an intermediate pier and two first temporary support structures supporting a first section of steel truss girder in a construction method for cantilever assembly of a porous continuous steel truss girder according to an embodiment of the present invention;
FIG. 5 is a side view of a first temporary support structure or a second temporary support structure of a construction method for splicing porous continuous steel truss arms according to an embodiment of the present invention;
FIG. 6 is a top view of an intermediate pier and two sets of first temporary support structures of a multi-hole continuous steel truss cantilever assembly construction method provided by an embodiment of the invention;
FIG. 7 is a front view of a second temporary support structure of a method for constructing a cantilever assembly of a porous continuous steel truss provided by an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a construction method for splicing a cantilever of a porous continuous steel truss girder according to an embodiment of the present invention after a first section of steel truss girder is spliced and a second section of steel truss girder is spliced;
Fig. 9 is a schematic structural diagram of a first section of steel truss girder and a second section of steel truss girder after being assembled according to the method for constructing the cantilever assembly of the porous continuous steel truss girder provided by the embodiment of the invention;
FIG. 10 is a schematic structural view of a third section of assembled steel truss girder of the multi-hole continuous steel truss girder cantilever assembly construction method according to the embodiment of the present invention;
FIG. 11 is a schematic structural view of a spliced third section of steel truss girder after splicing according to the construction method for splicing the cantilever of the porous continuous steel truss girder provided by the embodiment of the invention;
FIG. 12 is a schematic structural view of a spliced fourth section of steel truss according to an embodiment of the present invention after splicing a part of the fourth section of steel truss;
FIG. 13 is a schematic diagram of a structure of a spliced fourth section of steel truss girder after splicing according to the construction method for splicing a cantilever of a porous continuous steel truss girder provided by the embodiment of the invention;
fig. 14 is a schematic diagram of a steel truss girder assembled by the method for constructing the cantilever assembly of the porous continuous steel truss girder according to the embodiment of the invention after the temporary supporting structure is removed.
Reference numerals illustrate:
10. Bridge piers; 20. a first temporary support structure; 21. a support structure foundation; 22. a lower bolster; 23. a standard member; 24. an upper bolster; 25. a steel plate; 26. a longitudinal beam; 30. a first section of steel truss girder; 40. a second temporary support structure; 50. a second section of steel truss girder; 60. a third section of steel truss girder; 70. a fourth section of steel truss girder; 80. a crawler crane; 90. a lower chord centerline; 100. bridge pier bearing platform; 110. and (5) drilling piles on the bridge piers.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 14, a description will now be given of a construction method for splicing a cantilever of a porous continuous steel truss girder provided by the present invention. The construction method for splicing the porous continuous steel truss girder cantilever comprises the following steps:
The bridge piers 10 positioned in the middle along the arrangement direction of the plurality of bridge piers 10 are defined as middle piers, first temporary support structures 20 are erected on two sides of the middle piers, and the two first temporary support structures 20 and the middle piers are combined to form an assembly platform;
The first section of steel truss girder 30 is erected on the assembly platform, and the first section of steel truss girder 30 is erected from the middle part to the two ends in sequence;
respectively erecting second section steel trusses 50 at two ends of the first section steel trusses 30 along the extending direction of the first section steel trusses, wherein the second section steel trusses 50 are assembled in a cantilever mode; the piers 10 extending from the middle pier to the two sides of the middle pier are sequentially defined as a first pier 10, a second pier 10 and a third pier 10;
Erecting a second temporary supporting structure 40 between the middle pier and the pier 10, and enabling the middle position of the second section of steel truss girder 50 to be connected to the upper end of the second temporary supporting structure 40; the second section of steel truss girder 50 is constructed simultaneously with the second temporary support structure 40;
a jack is arranged at the upper end of the second temporary supporting structure 40, the upper end of the jack is connected with and jacks up the second section of steel truss girder 50, the posture of the second section of steel truss girder 50 is adjusted, and the cantilever end is lapped to the upper end of the first pier 10;
dismantling the first temporary support structure 20 and erecting between the first pier 10 and the second pier 10;
Cantilever-type assembling a third section of steel truss girder 60 along the extending direction of the second section of steel truss girder 50, enabling the middle position of the third section of steel truss girder 60 to be connected to the upper end of the first temporary supporting structure 20, arranging a jack at the upper end of the first temporary supporting structure 20, lifting the third section of steel truss girder 60, adjusting the posture of the third section of steel truss girder 60, and enabling the cantilever end to be connected to the upper end of the second pier 10;
and dismantling the second temporary supporting structure 40, erecting between the second bridge pier 10 and the third bridge pier 10, erecting the fourth section of steel truss girder 70 and adjusting the posture, and performing cyclic construction according to the steps in sequence to finish the construction of the porous continuous steel truss girder. If the number of the bridge piers is large, the fifth section of steel truss girder, the sixth section of steel truss girder and the like are sequentially constructed according to the steps, so that the construction is performed according to the steps.
Compared with the prior art, the construction method for splicing the multi-hole continuous steel truss cantilever, which is provided by the invention, has the advantages that the symmetrical cantilever is adopted from the middle pier to two sides to splice the steel truss, one working surface is changed into two working surfaces, the construction progress and efficiency are improved, the first temporary support structure 20 and the second temporary support structure 40 are mutually matched for construction and can be recycled, the number and cost of temporary support structures are reduced, the steel truss is not changed along with the environmental temperature, the construction can be matched and spliced through the conventional trestle and crawler crane 80, and the construction progress is improved.
Firstly, the difficult problem that the temporary construction platform is not easy to set in steel truss girder assembling construction is solved, an assembling platform is formed by the temporary supporting structure and the bridge pier 10 together, after the first section of steel truss girder 30 is assembled and constructed, the next section of steel truss girder can be assembled continuously in a symmetrical mode, and the operation is convenient and safe.
Secondly, the problem that the steel truss girder is longitudinally stretched and contracted due to temperature stress in the assembling process and cannot be lapped with the pier 10 support is solved.
And the temporary supporting structure can be recycled, so that the situation that the temporary supporting structure is fully distributed below the steel truss is avoided, the construction cost is not required to be increased, the engineering cost is reduced, and the posture of the steel truss can be adjusted through the jack, so that the steel truss is convenient and quick.
In this embodiment, please refer to fig. 1, named as follows: the middle pier is marked as IV#, and the marks of the piers 10 are I#, II#, III#, VI#, V#, VI#, and VII#, from the left end to the right end of the piers 10. The first temporary support structure 20 is numbered 0#, the second temporary support structure 40 is numbered 1#, the shifted first temporary support structure 20 is numbered 2#, and the shifted second temporary support structure 40 is numbered 3#. The above first temporary support structure 20 and second temporary support structure 40 are both two sets. In the figure 1, pier I refers to III# and V#, pier II refers to II# and VI#, and pier III refers to I# and VII#.
The temporary support structures referred to above or below are referred to as a first temporary support structure 20 and a second temporary support structure 40; the steel trusses refer to a first section of steel truss girder 30, a second section of steel truss girder 50, a third section of steel truss girder 60, a fourth section of steel truss girder 70 and the like.
The jack is arranged at the upper end of the temporary supporting structure, the posture of the steel truss girder is adjusted, the cantilever end of the steel truss girder can be lapped on the bridge pier 10, the stress of the steel truss girder is improved, and the problems that the steel truss girder is longitudinally deformed and lapped or connected with a pier top support are solved. Because the steel truss girder deforms after expansion with heat and contraction with cold and is not lapped or connected with the pier 10 support, the invention can adjust the posture of the steel truss girder, so that the steel truss girder can be lapped with the pier 10 support, the steel truss girder and the pier 10 support are perfectly connected, and the integral structural strength of the steel truss girder is ensured.
The application realizes the recycling of the temporary support structure, reduces the material cost, has the same structure as the first temporary support structure 20 and the second temporary support structure 40, can be repeatedly disassembled and assembled to different positions and can be recycled, the erection methods of the temporary support structures are the same, and the elevation of each installation position can meet the support requirement of the steel truss girder by adjusting the height of the installation position. Finally, the steel truss is connected with the side piers, so that the assembly of the steel truss integral structure (the steel truss integral structure is assembled from the middle part to the two sides in a cantilever mode) is realized, and finally, the first temporary support structure 20 and the second temporary support structure 40 can be completely removed.
Compared with the construction by a pushing method, the invention has the advantages that the temporary supporting structure is adopted to assist the steel truss girder to be in symmetrical cantilever assembly construction, the slideway or the guide girder is not required to be arranged, the occupied area is small, the conversion of a structural system is not involved in the construction process, the process is simple, the construction operation difficulty is low, and the construction safety can be ensured.
In some embodiments, referring to fig. 1 to 14, when the first temporary support structure 20 or the second temporary support structure 40 is removed, a jack is disposed at an upper end of the first temporary support structure 20 or the second temporary support structure 40 and correspondingly lifts the first section steel truss beam 30 or the second section steel truss beam 50, and a component connected between the first temporary support structure 20 and the first section steel truss beam 30 or a component connected between the second temporary support structure 40 and the second section steel truss beam 50 is removed, so that the first temporary support structure 20 or the second temporary support structure 40 is removed after the jack is retracted. One or more groups of jacks can be arranged at the upper end of the temporary supporting structure, and when a plurality of groups are arranged, the lifting is controlled simultaneously.
The component is the steel plate 25 which is described below, because the steel plate 25 plays a role in supporting the steel truss, the temporary supporting structure is separated from the steel truss after the steel plate 25 is removed, and the temporary supporting structure is convenient to detach in later period.
In some embodiments, referring to fig. 1-14, when the second temporary support structure 40 is first erected, the height of the second temporary support structure is smaller than the height of the first temporary support structure 20, and the middle position of the second section steel truss 50 is erected on the upper end of the second temporary support structure 40. Because when the cantilever assembles the second section steel truss girder 50, due to the gravity factor, the height of the cantilever end is lower than the height of the other end, and then the height of the cantilever end is slightly lower than the height of the first temporary supporting structure 20 when the second temporary supporting structure 40 is erected, the middle position of the second section steel truss girder 50 can be erected on the upper end of the second temporary supporting structure 40, and then the cantilever end of the second section steel truss girder 50 can be erected on the upper end of the first pier 10 through the lifting (the posture of the steel truss girder is adjusted).
In some embodiments, referring to fig. 1 to 14, the cantilever ends of the second section of steel truss girder 50 or the third section of steel truss girder 60 or the fourth section of steel truss girder 70 respectively correspond to be close to the first bridge pier 10 or the second bridge pier 10 or the third bridge pier 10. The cantilever end of the steel truss girder is slightly lower than the top end of the pier 10, but is close to the pier 10, so that the cantilever end of the steel truss girder can be lapped to the upper end of the pier 10 through the lifting of the jack. When the cantilever end of the steel truss girder is far away from the pier 10, overlapping is not easily achieved.
In some embodiments, referring to fig. 1 to 14, each of the first temporary support structure 20 and the second temporary support structure 40 includes a support structure foundation 21, a lower bolster 22, a standard member 23, an upper bolster 24, a longitudinal beam 26, and a plurality of steel plates 25 sequentially disposed from bottom to top, and the steel plates 25 are used to support the first section steel truss beam 30 or the second section steel truss beam 50 or the third section steel truss beam 60 or the fourth section steel truss beam 70, respectively.
The first temporary support structure 20 is arranged below the E1 and E1' nodes of the steel truss girder in FIG. 4, and the E0 node is positioned right above the middle pier, so that the first temporary support structure 20 can stably support the steel truss girder. The total thickness or height of the multi-layered steel plates 25 is adjustable, and is reasonably adjusted according to the installation height of the steel truss. The connection modes of the supporting structure foundation 21, the lower bolster 22, the standard members 23, the upper bolster 24 and the longitudinal beams 26 can be connected by using the connection modes in the prior art such as bolts, and the like, so that the assembly and disassembly are convenient. The multi-layer steel plates 25 are stacked in a laminated mode, the thickness of the multi-layer steel plates is adjustable, the jack is arranged at the upper end of the longitudinal beam 26, and the upper end of the jack abuts against the steel truss.
The dashed line in fig. 2 shows the lower chord center line 90 of the steel truss, the middle rectangular frame line shows the pier cap 100, and the pier bored pile 110 is located at the bottom of the pier 10 in fig. 4.
In some embodiments, referring to fig. 1 to 14, when the first temporary support structure 20 or the second temporary support structure 40 is removed, a jack is disposed at an upper end of the longitudinal beam 26, and is lifted to lift the first section steel truss beam 30 or the second section steel truss beam 50 or the third section steel truss beam 60 or the fourth section steel truss beam 70, and at least one layer of steel plates 25 is pulled out after the lifting, so that the jack is retracted, and the first temporary support structure 20 or the second temporary support structure 40 is removed. And when the temporary supporting structure is separated from the steel truss girder, the dismantling operation can be implemented. The first temporary support structure 20 or the second temporary support structure 40, which is later displaced, is removed in the same manner as the removal.
In some embodiments, referring to fig. 1 to 14, a fixed support is provided at the upper end of the middle pier, and movable supports are provided at the upper ends of the piers 10 located at both sides of the middle pier. The movable support can realize fine adjustment, the steel truss girder is assembled in a symmetrical cantilever manner from the middle to the two sides in sequence, and the middle part of the steel truss girder is fixedly connected with the fixed support.
In some embodiments, referring to fig. 1-14, when first temporary support structure 20 and second temporary support structure 40 are erected, construction may be performed by cooperating a landing gear mounted below the steel truss with crawler 80 disposed on the landing gear. The trestle bridge is arranged below the steel truss girder to be installed, namely at the lateral position of the pier 10, and the crawler 80 can convey construction materials and the like to a construction site, so that later construction and use are facilitated. The trestle is a preset structure and provides support for cantilever assembly construction of the steel truss.
In particular embodiments, the height of the temporary support structure may be adjusted by adjusting the thickness of the multi-layered steel plate 25 to adjust the support height for the steel truss.
In some embodiments, referring to fig. 1-14, the assembly construction steps of the first section steel truss girder 30 include: the middle part of the first section steel truss girder 30 is symmetrically assembled from the middle part to the two ends in sequence according to the order of the lower chord member, the web member and the upper chord member, and a closed triangle stable structure is formed inside the first section steel truss girder 30 after the assembly.
From fig. 4, the lower chords corresponding to the nodes E1 to E1 'are assembled symmetrically from the node E0 to the two sides, the lower chords are assembled to the preset positions in a sectional manner, the upper parts of the lower chords correspond to the web members and the upper chords in a sectional manner, and in order to ensure the assembly safety, the steel truss girder forms a closed triangle stable system as far as possible, and the assembly of the first section of steel truss girder 30 can be completed when the steel truss girder is assembled to the nodes A2 and A2'.
In some embodiments, referring to fig. 1-14, a support structure foundation 21 includes a plurality of underground driven steel pipe piles and connectors for connecting the plurality of steel pipe piles, the plurality of steel pipe piles being laid to form a stable structure in the shape of a Chinese character 'tian'. The steel pipe pile is driven into the ground in a driving mode or an installing mode in the prior art, and the steel pipe pile has enough supporting strength after being installed.
In the concrete implementation, the number of the steel pipe piles is nine, the steel pipe piles are distributed in a shape of a Chinese character 'Tian', the structure is stable, the supporting strength to the steel truss is high, and the stability is high.
In some embodiments, referring to fig. 1 to 14, the standard component 23 includes a plurality of component modules assembled with each other, and the sizes of the plurality of component modules can be reasonably selected according to the supporting height of the steel truss girder to be assembled when the standard component 23 is assembled. The standard component 23 is a product in the prior art, and can be assembled into different heights so as to support steel trusses at different heights, namely the height of the standard component 23 is adjustable and controllable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The construction method for splicing the porous continuous steel truss girder cantilever is characterized by comprising the following steps of:
the bridge pier positioned in the middle along the arrangement direction of the bridge piers is defined as a middle pier, first temporary supporting structures are erected on two sides of the middle pier, and the two first temporary supporting structures and the middle pier are combined to form an assembly platform;
A first section of steel truss girder is erected on the assembly platform, and the first section of steel truss girder is sequentially erected from the middle part to the two ends;
Respectively erecting second section steel trusses at two ends of the first section steel trusses along the extending direction of the first section steel trusses, wherein the second section steel trusses are assembled in a cantilever mode; the piers extending from the middle pier to the two sides of the middle pier are sequentially defined as a first pier, a second pier and a third pier;
A second temporary supporting structure is erected between the middle pier and the pier I, and the middle position of the second section of steel truss girder is connected to the upper end of the second temporary supporting structure in a lap joint mode;
a jack is arranged at the upper end of the second temporary supporting structure, so that the upper end of the jack is connected with and jacks up the second section of steel truss girder, the posture of the second section of steel truss girder is adjusted, and the cantilever end is lapped to the upper end of the first pier;
dismantling the first temporary supporting structure and erecting between the first pier and the second pier;
Assembling a third section of steel truss girder in a cantilever manner along the extending direction of the second section of steel truss girder, enabling the middle position of the third section of steel truss girder to be connected to the upper end of the first temporary supporting structure in a lap joint mode, arranging a jack at the upper end of the first temporary supporting structure, lifting the third section of steel truss girder, adjusting the posture of the third section of steel truss girder, and enabling the cantilever end to be connected to the upper end of the second pier in a lap joint mode;
And dismantling the second temporary supporting structure, erecting between the second bridge pier and the third bridge pier, erecting a fourth section of steel truss girder and adjusting the posture, and sequentially performing cyclic construction according to the steps to finish the construction of the porous continuous steel truss girder.
2. The construction method for splicing the cantilever beams of the porous continuous steel truss beam according to claim 1, wherein when the first temporary supporting structure or the second temporary supporting structure is removed, a jack is arranged at the upper end of the first temporary supporting structure or the second temporary supporting structure and correspondingly lifts the first section steel truss beam or the second section steel truss beam, a part connected between the first temporary supporting structure and the first section steel truss beam is removed, or a part connected between the second temporary supporting structure and the second section steel truss beam is removed, so that the jack is retracted and then the first temporary supporting structure or the second temporary supporting structure is removed.
3. The construction method for splicing the cantilever beams of the multi-hole continuous steel truss according to claim 1, wherein when the second temporary supporting structure is erected for the first time, the height of the cantilever beams is smaller than that of the first temporary supporting structure, and the middle position of the second section of steel truss is spliced to the upper end of the second temporary supporting structure.
4. The construction method for splicing the cantilever of the porous continuous steel truss girder according to claim 1, wherein the cantilever ends of the second section of steel truss girder or the third section of steel truss girder or the fourth section of steel truss girder are respectively close to the first bridge pier, the second bridge pier or the third bridge pier.
5. The construction method for splicing the cantilever beams of the porous continuous steel truss beam, as set forth in claim 1, wherein the first temporary supporting structure and the second temporary supporting structure comprise supporting structure foundations, lower beams, standard components, upper beams, longitudinal beams and a plurality of layers of steel plates which are sequentially arranged from bottom to top, and the steel plates are used for correspondingly supporting the first section steel truss beam or the second section steel truss beam or the third section steel truss beam or the fourth section steel truss beam.
6. The construction method for splicing the cantilever beams of the porous continuous steel truss beam, according to claim 5, wherein when the first temporary supporting structure or the second temporary supporting structure is dismounted, a jack is arranged at the upper end of the longitudinal beam, the jack is enabled to lift the first section of steel truss beam or the second section of steel truss beam or the third section of steel truss beam or the fourth section of steel truss beam, at least one layer of steel plate is pulled out after the jack is lifted, the jack is retracted, and the first temporary supporting structure or the second temporary supporting structure is dismounted.
7. The construction method for splicing the porous continuous steel truss girder cantilever according to claim 1, wherein a fixed support is arranged at the upper end of the middle pier, and movable supports are arranged at the upper ends of the piers positioned at the two sides of the middle pier.
8. The method for splicing and constructing the cantilever of the porous continuous steel truss girder according to claim 1, wherein when the first temporary supporting structure and the second temporary supporting structure are erected, the construction can be carried out in a matched manner through a trestle installed below the steel truss girder and a crawler crane arranged on the trestle.
9. The method for splicing and constructing the cantilever of the porous continuous steel truss girder according to claim 1, wherein the splicing and constructing step of the first section of steel truss girder comprises the following steps:
The middle part of the first section steel truss girder is symmetrically assembled from the middle part to the two ends in sequence according to the sequence of the lower chord member, the web member and the upper chord member, and a closed triangle stable structure is formed inside the first section steel truss girder after the assembly.
10. The method for splicing and constructing the cantilever of the porous continuous steel truss girder according to claim 5, wherein the supporting structure foundation comprises a plurality of steel pipe piles driven into the ground and connecting pieces for connecting the plurality of steel pipe piles, and the plurality of steel pipe piles are distributed to form a stable structure in a shape of a Chinese character 'tian'.
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