CN114319066B - Spliced steel truss box girder and installation method thereof - Google Patents
Spliced steel truss box girder and installation method thereof Download PDFInfo
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- CN114319066B CN114319066B CN202111461151.3A CN202111461151A CN114319066B CN 114319066 B CN114319066 B CN 114319066B CN 202111461151 A CN202111461151 A CN 202111461151A CN 114319066 B CN114319066 B CN 114319066B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000009434 installation Methods 0.000 title abstract description 9
- 230000000712 assembly Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Abstract
The invention discloses a spliced steel truss box girder and an installation method thereof, wherein the box girder comprises the following components: the two U-shaped support plates are provided with openings which are opposite to each other to form a containing cavity, the first side plates of the two support plates can be detachably fixed through a fixing assembly to form a bottom plate of the box girder, the second side plates of the two support plates are butted to form a top plate of the box girder, and the bottom plates of the two support plates form side plates of the box girder; the hoisting assembly is detachably fixed on the two support plates; the steel truss is detachably fixed in the accommodating cavity, the steel truss is arranged along the length direction of the support plate in a through length mode, and a plurality of prestress steel bundles are fixed in the steel truss. The invention solves the technical problems of inconvenient hoisting and difficult later maintenance of the box girder in the prior art, is beneficial to the installation and transportation of the box girder, greatly reduces the workload and various costs, ensures that the prestressed steel girder and the steel truss reach an active stress state, bears the load together with the box girder, and improves the bearing capacity of the box girder.
Description
Technical Field
The invention relates to the field of building construction, in particular to a spliced steel truss box girder.
Background
The construction of the box girder is to cast in sections, namely, an initial construction section of the box girder, namely, a first construction section is cast on a concrete bearing platform, namely, a bottom template and side templates are erected, then, a bottom plate and two side templates of the construction section are cast, then, a full scaffold is erected on the bottom plate, a top template is erected on the top of the scaffold, then, a top plate is cast, along with the continuous development of modern transportation industry, the requirements on the span, the quality and the economic performance of a bridge are higher and higher, and when a single material is adopted, a better balance point is difficult to find between the mechanical property and the economic performance of the structure.
At present, the box girder template is generally required to be assembled in the construction process, the standard design load standard value is low, so that a large number of bridges are insufficient in bearing capacity, structural damage is easy to occur in a short period of use, the template is assembled according to the geometric shape of an outer mold, the inclined struts are adopted for reinforcement, finally, integral pouring is carried out, the concrete box girder is finally formed, the integral box girder is greatly difficult to construct when being hoisted, installed and transported, the steel truss improves the bearing capacity of the box girder through the strength, rigidity and prestress of the steel truss, the bearing capacity of the box girder can be continuously reduced in the use process, and the maintenance of the box girder is not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a spliced steel truss box girder, which solves the technical problems of inconvenient box girder hoisting and difficult later maintenance in the prior art.
In a first aspect, the invention discloses a spliced steel truss box girder, comprising:
the two U-shaped support plates are provided with openings which are opposite to each other to form a containing cavity, the first side plates of the two support plates can be detachably fixed through a fixing assembly to form a bottom plate of the box girder, the second side plates of the two support plates are butted to form a top plate of the box girder, and the bottom plates of the two support plates form side plates of the box girder;
The hoisting assembly is detachably fixed on the two support plates;
The steel truss is detachably fixed in the accommodating cavity, the steel truss is arranged along the length direction of the support plate in a through length mode, and a plurality of prestress steel bundles are fixed in the steel truss.
The spliced steel truss box girder is further improved in that the hoisting assembly comprises an inverted U-shaped supporting plate, the side plates of the supporting plate are detachably fixed with the bottom plate of the supporting plate, and the bottom surface of the supporting plate is fixedly provided with a cross beam for hoisting.
The spliced steel truss box girder is further improved in that a limit groove is formed in the outer wall of a side plate of the box girder, a limit block is arranged on the inner wall of the supporting plate, and the limit block is clamped and fixed with the limit groove.
The spliced steel truss box girder is further improved in that a plurality of prestress steel bundles are radially fixed on a plurality of inner sections of the steel truss.
The spliced steel truss box girder is further improved in that a plurality of propping components propping against the inner wall of the support plate are respectively fixed on the top surface and the side surface of the steel truss.
The spliced steel truss box girder is further improved in that the fixing assembly comprises a clamping plate arranged at the edge of a first side plate of one support plate and a clamping groove arranged at the edge of the first side plate of the other support plate, and the clamping plate is clamped with the clamping groove to fix the two support plates.
The spliced steel truss box girder is further improved in that a sliding groove is formed in a bottom plate of the box girder, a sliding plate is arranged at the bottom of the steel truss, and the sliding plate slides into the sliding groove to install the steel truss.
In a second aspect, the invention also provides a method for installing the spliced steel truss box girder, which comprises the following steps:
providing two U-shaped support plates;
the two support plate openings are oppositely formed into a containing cavity and are fixed through a fixing component;
providing a hoisting assembly;
Mounting hoisting assemblies on the two support plates;
Providing a steel truss and a plurality of prestressed steel bundles;
Fixing a plurality of prestress steel bundles in the steel truss;
Fixing a steel truss in the accommodating cavity along the length direction of the support plate;
And hoisting the box girder to the position to be installed through the hoisting assembly.
The spliced steel truss box girder is further improved in that a sliding groove is formed in a bottom plate of the box girder, and a sliding plate is arranged at the bottom of the steel truss;
when the steel truss is fixed in the accommodating cavity along the length direction of the support plate, the sliding plate is slid into the sliding groove to install the steel truss.
The spliced steel truss box girder is further improved in that a plurality of propping components propping against the inner wall of the support plate are respectively fixed on the top surface and the side surface of the steel truss;
After the steel truss is fixed in the accommodating cavity along the length direction of the support plate, the jacking component is adjusted to be propped against the inner wall of the box girder.
Compared with the prior art, the invention has positive and obvious effects. According to the detachable box girder structure and the lifting assembly arranged on the box girder, the technical problems that the box girder in the prior art is inconvenient to lift and difficult to maintain in the later period are solved. The box girder is assembled in a mode of splicing all the components, so that the box girder is convenient to install and transport, the workload and various costs are greatly reduced, the assembly and disassembly are very convenient, the plurality of jacking components are adjusted to be in contact with the inner wall of the box girder, the prestressed steel bundles and the steel trusses are in an active stress state, the prestressed steel bundles and the box girder bear loads together, and the bearing capacity of the box girder is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a spliced steel truss box girder of the present invention.
Fig. 2 is a schematic view of the internal structure of the spliced steel truss box girder of the present invention.
Fig. 3 is a schematic side view of a spliced steel truss box girder of the present invention.
Fig. 4 is a schematic view of the steel truss structure of the spliced steel truss box girder of the present invention.
Fig. 5 is a schematic view of a strut structure of a spliced steel truss box girder of the present invention.
Fig. 6 is an enlarged view of circle a in fig. 1.
Fig. 7 is an enlarged view of circle B in fig. 1.
Fig. 8 is an enlarged view of circle C in fig. 5.
Fig. 9 is an enlarged view of circle D in fig. 5.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the present invention provides a spliced steel truss box girder, comprising: the two U-shaped support plates 1 are oppositely arranged at the openings of the two support plates 1 to form a containing cavity, the first side plates of the two support plates 1 are detachably fixed through a fixing assembly to form a bottom plate of the box girder, the second side plates of the two support plates 1 are butted to form a top plate of the box girder, and the bottom plates of the two support plates 1 form side plates of the box girder; the hoisting components are detachably fixed on the two support plates 1; the steel truss is detachably fixed in the accommodating cavity, is arranged along the length direction of the support plate 1 and is internally fixed with a plurality of prestress steel bundles 14. In the embodiment, two support plates 1 are butted to form a box girder with a trapezoid cross section so as to meet the stress condition of a conventional bridge. The steel truss can be detachably fixed in the box girder, so that the steel truss can be directly replaced and maintained, the convenience of later maintenance is improved, the box girder is detachably installed, the transportation can be carried out in the transportation and hoisting processes, and the convenience of transportation and hoisting is greatly improved.
Preferably, as shown in fig. 1 to 3, the lifting assembly comprises an inverted U-shaped supporting plate 9, wherein a side plate of the supporting plate 9 is detachably fixed with a bottom plate of the supporting plate 1, and a cross beam 10 for lifting is fixed on the bottom surface of the supporting plate 9. The cross beam 10 is provided with a plurality of lifting holes, and the middle part of the supporting plate 9 is also provided with a plurality of lifting holes so as to facilitate the lifting of the box girder and the traction during the installation. The side plates of the supporting plate 9 are fixed with the side plates of the box girder, so that the acting force of the top plate of the box girder during hoisting can be greatly reduced, and the damage to the box girder is avoided. The beam 10 can be fixed with other structures of the bridge directly at a later stage without being detached after being hoisted.
Specifically, as shown in fig. 1,2, 5, 6 and 9, a limiting groove 13 is formed on the outer wall of the side plate of the box girder, a limiting block 8 is arranged on the inner wall of the supporting plate 9, and the limiting block 8 is clamped and fixed with the limiting groove 13. The limiting block 8 and the limiting groove 13 are axially arranged in a through length mode and are matched with each other in shape, the limiting block 8 can freely slide in the limiting groove 13 through the mutual matching between the limiting block 8 and the limiting groove 13, and the limiting block 8 is slidably connected in the limiting groove 13, so that the supporting plate 9 and the box girder can be fixed in a detachable mode. The limit groove 13 and the limit block 8 are both T-shaped. Further, the side plates of the supporting plate 9 can be fixed with the side plates of the box girder through a plurality of fastening bolts 16, so that the firmness of fixing the supporting plate 9 with the box girder is improved.
Preferably, as shown in fig. 1, 2 and 4, a plurality of the prestressed steel bundles 14 are radially fixed to a plurality of inner sections of the steel truss. The steel truss comprises two side frames 5 and a web plate fixed between the two side frames 5, wherein the side frames 5 comprise two transverse rods arranged in a through length mode and a plurality of vertical rods fixed between the two transverse rods, the vertical rods on the two side frames 5 are opposite in position, and inclined rods 17 are fixed between the two adjacent vertical rods. The web includes the upper web 6 of fixing on two side frame 5 tops and fixes the lower web 15 in the lower part of side frame 5, and upper web 6 extends side frame 5 and contacts with the inside wall of case roof beam, and the holistic bearing capacity of steel truss has been improved with the setting of web to diagonal rod 17. The cross section shape of the steel truss is matched with that of the box girder, and the steel truss is also trapezoid. A plurality of prestress steel bundles 14 are fixed between two vertical rods opposite to the two side frames 5, the prestress steel bundles 14 are distributed in a crossing way, compressive stress is pre-applied to the steel bundles during construction, and the prestress stress can fully or partially offset tensile stress caused by load during structural service, so that the box girder is prevented from being damaged.
Preferably, as shown in fig. 1 to 4, a plurality of propping assemblies propping against the inner wall of the support plate 1 are respectively fixed on the top surface and the side surface of the steel truss. The jacking assembly comprises a plurality of supporting assemblies 7 fixed on the top surface of an upper web plate 6 and a plurality of jacking structures 18 fixed on the outer surface of a side frame 5, wherein each supporting assembly 7 comprises an adjusting structure 71, each adjusting structure 71 is fixed on the upper surface of the upper web plate 6, a bolt jacking column 72 is arranged in each adjusting structure 71, the top ends of the bolt jacking columns 72 are tightly jacked with the inner wall of a box girder top plate, each adjusting structure 71 is formed by sleeving a bearing with a threaded ring, and the bolt jacking columns 72 can rotate in the threaded ring and move up and down; and the screw thread circle cup joints in the bearing, because the bolt jack-up post 72 produces great frictional force with the roof of the case roof beam and is difficult for rotating, makes bolt jack-up post 72 also can reciprocate under the condition of not rotating through the setting of bearing, is favorable to personnel's regulation work. Specifically, the jacking structure 18 is preferably configured as an adjustable hydraulic rod, so that it abuts against the inner sidewall of the box girder to ensure the stability of the inner steel truss. When the steel truss is fixed in the box girder, the adjustment work of the jacking component is carried out, and because the volume of the box girder built by the bridge is larger, the gap between the steel bundles is larger, and a certain working space can be provided for constructors. Through setting up jacking structure 18 and supporting component 7, adjust a plurality of jacking structure 18 and make its contact with the roof beam inside wall, adjust a plurality of supporting component 7, make bolt jack-up post 72 rise and contact with the roof beam roof to make prestressing force steel beam 14 and diagonal bar 17 reach initiative stress state, and bear the load effect with the roof beam combined action, improve the ability of this roof beam bearing capacity.
Preferably, as shown in fig. 1, 2,5, 7 and 8, the fixing assembly includes a clamping plate 2 disposed at the edge of the first side plate of one support plate 1 and a clamping groove 3 disposed at the edge of the first side plate of the other support plate 1, and the clamping plate 2 and the clamping groove 3 are clamped to fix two support plates 1. This draw-in groove 3 and cardboard 2 are axial logical long setting, during the installation, directly slide cardboard 2 in draw-in groove 3 until the installation is accomplished, and this mounting means convenient and fast, the operation degree of difficulty is little, is favorable to improving the efficiency of construction. Further, a plurality of groups of threaded holes are correspondingly formed in the clamping plate 2 and the clamping groove 3, after the clamping plate 2 slides into the clamping groove 3 to be installed, screws 4 are arranged on each group of threaded holes in a penetrating mode, so that the relative positions of the clamping plate 2 and the clamping groove 3 are fixed, and the clamping plate 2 is prevented from sliding in the clamping groove 3 after the installation is completed.
Preferably, as shown in fig. 1, 4, 5 and 7, a sliding groove 12 is formed on the bottom plate of the box girder, a sliding plate 11 is arranged at the bottom of the steel truss, and the sliding plate 11 slides into the sliding groove 12 to install the steel truss. The quantity of this sliding plate 11 is two and locates the lower extreme of two side framves 5 respectively, and the quantity of sliding tray 12 is two and is relative with the position of sliding plate 11, and sliding plate 11 and sliding tray 12 all set up along the axial logical length, and sliding plate 11 sliding connection is in sliding tray 12, and sliding plate 11 is the U-shaped of opening orientation horizontally, and sliding tray 12 is L shape, and sliding tray 11's bottom slidable mounting is in sliding tray 12, and this mounting means easy dismounting has improved the efficiency of construction of later stage maintenance greatly.
On the other hand, the invention also provides a mounting method of the spliced steel truss box girder, which comprises the following steps:
Providing two U-shaped support plates 1;
the openings of the two support plates 1 are opposite to form a containing cavity and are fixed through a fixing component;
providing a hoisting assembly;
Mounting hoisting assemblies on the two support plates 1;
Providing a steel truss and a plurality of prestressed steel bundles 14;
Fixing a plurality of prestressed steel bundles 14 inside the steel truss;
fixing a steel truss in the accommodating cavity along the length direction of the support plate 1;
And hoisting the box girder to the position to be installed through the hoisting assembly.
Preferably, a sliding groove 12 is formed in the bottom plate of the box girder, and a sliding plate 11 is arranged at the bottom of the steel truss;
When the steel truss is fixed in the holding cavity along the length direction of the support plate 1, the sliding plate 11 is slid into the sliding groove 12 to mount the steel truss.
Preferably, the top surface and the side surface of the steel truss are respectively fixed with a plurality of propping components which are propped against the inner wall of the support plate 1;
after the steel truss is fixed in the accommodating cavity along the length direction of the support plate 1, the jacking component is adjusted to be propped against the inner wall of the box girder.
According to the detachable box girder structure and the lifting assembly arranged on the box girder, the technical problems that the box girder in the prior art is inconvenient to lift and difficult to maintain in the later period are solved. The box girder is assembled in a mode of splicing all the components, so that the box girder is convenient to install and transport, the workload and various costs are greatly reduced, the assembly and disassembly are very convenient, the plurality of jacking components are adjusted to be in contact with the inner wall of the box girder, the prestressed steel bundles 14 and the steel trusses are in an active stress state, the prestressed steel bundles and the box girder are loaded together, and the bearing capacity of the box girder is improved.
The following steps are specific installation steps:
When the box girder is required to be disassembled (such as transportation and hoisting), the clamping plate 2 and the screw 4 on the clamping groove 3 are loosened through the tool, so that the clamping plate 2 can freely slide in the clamping groove 3, the fastening bolt 16 is also loosened, the limiting strip can freely slide in the limiting groove 13, the supporting plate 1 on one side is pushed to enable the clamping plate 2 to be separated from the clamping groove 3, the box girder is effectively divided into two parts, the supporting plate 1 is pushed to two sides, and the limiting strip is separated from the limiting groove 13, so that the supporting plate 1 can be disassembled from the supporting plate 9.
When the box girder is required to be assembled, the supporting plate 1 is hoisted to be in contact with the side plate of the supporting plate 9, the limiting strip slides into the limiting groove 13 and pushes the supporting plate 1, and then the other supporting plate 1 is hoisted to clamp the clamping plate 2 into the clamping groove 3, so that the supporting plate 1 is pushed and the clamping plate 2 is driven to slide in the clamping groove 3 until the clamping plate slides in place.
When the edge positions of the two support plates 1 are aligned, a box girder frame can be formed, a plurality of screws 4 and a plurality of fastening bolts 16 are screwed, the clamping plate 2 and the support plates 1 are limited, and then the steel truss and the steel truss support plates 1 are placed into the box girder, so that the two sliding plates 11 are in sliding connection in the sliding groove 12 and slide until the edges slide to be aligned.
After the steel truss is completely placed in the two box girder support plates 1, the plurality of support assemblies 7 are adjusted to enable the bolt jacking columns 72 to ascend to be in contact with the inner walls of the box girder top plates, the upper web plates 6 are in contact with the inner walls of the two box girder side plates, and the plurality of jacking structures 18 are adjusted to be in contact with the inner walls of the box girder side plates, so that the splicing of the box girder can be completed.
According to the detachable box girder structure and the lifting assembly arranged on the box girder, the technical problems that the box girder in the prior art is inconvenient to lift and difficult to maintain in the later period are solved. The box girder is assembled in a mode of splicing all the components, so that the box girder is convenient to install and transport, the workload and various costs are greatly reduced, the assembly and disassembly are very convenient, the plurality of jacking components are adjusted to be in contact with the inner wall of the box girder, the prestressed steel bundles and the steel trusses are in an active stress state, the prestressed steel bundles and the box girder bear loads together, and the bearing capacity of the box girder is improved.
None of the inventions are related to the same or are capable of being practiced in the prior art. The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. A spliced steel truss box girder, comprising:
The two U-shaped support plates are provided with openings which are opposite to each other to form a containing cavity, the first side plates of the two support plates are detachably fixed through a fixing assembly to form a bottom plate of the box girder, the second side plates of the two support plates are butted to form a top plate of the box girder, and the bottom plates of the two support plates form side plates of the box girder;
the hoisting assembly is detachably fixed on the two support plates;
the steel truss is detachably fixed in the accommodating cavity, the steel truss is arranged along the length direction of the support plate in a through length mode, and a plurality of prestress steel bundles are fixed in the steel truss;
The cross section of the steel truss is trapezoidal, a sliding groove is formed in the bottom plate of the box girder, a sliding plate is arranged at the bottom of the steel truss, and the sliding plate slides into the sliding groove to install the steel truss; the lifting assembly comprises an inverted U-shaped supporting plate, the side plates of the supporting plate and the bottom plate of the supporting plate are detachably fixed, a cross beam used for lifting is fixed on the bottom surface of the supporting plate, a plurality of lifting holes are formed in the cross beam, and a plurality of lifting holes are also formed in the middle of the supporting plate.
2. The spliced steel truss box girder according to claim 1, wherein a limit groove is formed in the outer wall of a side plate of the box girder, a limit block is arranged on the inner wall of the supporting plate, and the limit block is clamped and fixed with the limit groove.
3. The spliced steel truss box girder of claim 1, wherein a plurality of the prestressed steel bundles are radially fixed to a plurality of inner sections of the steel truss.
4. The spliced steel truss box girder of claim 1, wherein the top and side surfaces of the steel truss are respectively fixed with a plurality of jacking assemblies that are abutted against the inner walls of the support plates.
5. The spliced steel truss box girder of claim 1, wherein the fixing assembly comprises a clamping plate arranged at the edge of a first side plate of one support plate and a clamping groove arranged at the edge of a first side plate of the other support plate, and the clamping plate is clamped with the clamping groove to fix the two support plates.
6. A method for installing a spliced steel truss box girder according to any one of claims 1 to 5, comprising the steps of:
providing two U-shaped support plates;
the two support plate openings are oppositely formed into a containing cavity and are fixed through a fixing component;
providing a hoisting assembly;
Mounting hoisting assemblies on the two support plates;
Providing a steel truss and a plurality of prestressed steel bundles;
fixing a plurality of prestress steel bundles in the steel truss;
Fixing a steel truss in the accommodating cavity along the length direction of the support plate in a through-length manner;
and hoisting the box girder to the position to be installed through the hoisting assembly.
7. The method for installing the spliced steel truss box girder according to claim 6, wherein a sliding groove is formed in a bottom plate of the box girder, and a sliding plate is arranged at the bottom of the steel truss;
when the steel truss is fixed in the accommodating cavity along the length direction of the support plate, the sliding plate is slid into the sliding groove to install the steel truss.
8. The method for installing a spliced steel truss box girder according to claim 6, wherein a plurality of jacking components which are propped against the inner wall of the support plate are respectively fixed on the top surface and the side surface of the steel truss;
After the steel truss is fixed in the accommodating cavity along the length direction of the support plate, the jacking component is adjusted to be propped against the inner wall of the box girder.
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| CN202111461151.3A CN114319066B (en) | 2021-12-01 | 2021-12-01 | Spliced steel truss box girder and installation method thereof |
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