CN112726415B - Steel box girder up-down crossing construction support structure and construction method - Google Patents
Steel box girder up-down crossing construction support structure and construction method Download PDFInfo
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- CN112726415B CN112726415B CN202110010503.7A CN202110010503A CN112726415B CN 112726415 B CN112726415 B CN 112726415B CN 202110010503 A CN202110010503 A CN 202110010503A CN 112726415 B CN112726415 B CN 112726415B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 235
- 239000010959 steel Substances 0.000 title claims abstract description 235
- 238000010276 construction Methods 0.000 title claims abstract description 55
- 238000009826 distribution Methods 0.000 claims abstract description 39
- 238000003466 welding Methods 0.000 claims abstract description 32
- 239000004567 concrete Substances 0.000 claims description 46
- 239000011150 reinforced concrete Substances 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000008093 supporting effect Effects 0.000 claims description 6
- 230000002411 adverse Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 238000009415 formwork Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The application discloses a steel box girder up-down cross construction support structure and a construction method, wherein the steel box girder up-down cross construction support structure comprises a first support module, a backing beam and a second support module, the first support module comprises a plurality of first upright posts, a plurality of first parallel channel steel and a plurality of first diagonal braces, the plurality of first parallel channel steel is welded between two adjacent first upright posts respectively, the plurality of first diagonal braces are welded at the welding positions between the first parallel channel steel and the first upright posts respectively, support I-shaped steel is arranged at the upper part of the backing beam, a U-shaped bottom layer steel box girder section is erected at the upper part of the support I-shaped steel, a distribution beam is erected at the upper part of the U-shaped bottom layer steel box girder section, the second support module comprises a plurality of second upright posts, a plurality of second parallel channel steel and a plurality of second diagonal braces, and the plurality of second upright posts are erected at the upper part of the distribution beam. According to the scheme, the bottom layer steel box girder can be installed firstly, then the upper layer steel box girder is installed, the construction period is shortened, and the construction efficiency is improved.
Description
Technical Field
The application relates to the technical field of bridge engineering, in particular to a support structure for up-down crossing construction of a steel box girder.
Background
Along with the development of urban construction in China, urban roads, particularly urban bridges, are rapidly developed, and urban bridges are often designed to be overlapped in an upper-lower multi-layer crossing way due to terrain limitation, particularly at multi-directional plane intersections, so that land reclamation difficulty and cost are reduced.
The bridge cross design brings a series of construction problems, namely, the upper layer and the lower layer are steel box girders (namely, the steel box girders) or the lower layer is steel box girders, and the upper layer is steel structure box girders.
The traditional construction method is to construct a high layer and a low layer firstly, and the construction sequence is that the construction method is performed according to the part from top to bottom, and the construction method has the following defects: ① In general, the upper and lower clearance heights of the upper and lower crossing steel box girders are slightly larger than 5m, if the bridge deck is wider or the construction site is limited, after the upper layer construction is completed, the lower layer steel box girder bracket and the girder body are difficult to erect due to the limit of the two-layer design clearance (the crane boom collides with the upper layer completed steel box girder); ② Firstly, erecting a high-rise steel girder support, after the whole welding construction of the high-rise steel box girder is finished, dismantling the high-rise support and erecting the steel pipe support of the low-rise steel box girder again, and repeatedly erecting and dismantling the support, wherein the construction period is longer, the efficiency is low, and a sufficient construction period is needed as a basis.
In the face of rapid urban construction development and urgent urban resident travel demands, how to ensure that the construction of the upper and lower intersections of the steel structure bridge can be completed safely and efficiently in the shortest construction time is a problem that bridge constructors must face and solve.
Disclosure of Invention
The application mainly aims to provide a support structure for up-down cross construction of a steel box girder and a construction method thereof, which are used for solving the problems of difficult erection of the lower steel box girder, long construction period and low efficiency due to the fact that the upper construction is adopted and the lower construction is adopted in the related technology.
In order to achieve the above purpose, the application provides a steel box girder up-down crossing construction support structure, which comprises a first support module, a bolster and a second support module.
The first support module is provided with a plurality of, first support module includes a plurality of first stands, a plurality of first parallel channel-section steel and a plurality of first bracing, and is a plurality of first parallel channel-section steel welds respectively between two adjacent first stands, a plurality of first bracing weld respectively in first parallel channel-section steel with weld between the first stand.
The bolster is installed in a plurality of upper portions of first support module, support I-steel is installed to the upper portion of bolster, the upper portion of support I-steel is erect and is had the U type bottom steel case girder segment, the upper portion of U type bottom steel case girder segment is erect and is had the distribution beam.
The second support module is provided with a plurality of, the second support module includes a plurality of second stands, a plurality of second parallel channel-section steel and a plurality of second bracing, and is a plurality of the second stand erect in the upper portion of distribution beam, a plurality of the second parallel channel-section steel welds respectively between two adjacent second stands, a plurality of the second bracing weld respectively in the second parallel channel-section steel with the welding position between the second stand.
Preferably, the concrete foundation layer is further included, an embedded steel plate is arranged on the upper portion of the concrete foundation layer, split heads are welded on the embedded steel plate, the split heads extend into the concrete foundation layer, and a plurality of first stand columns are welded on the upper portion of the embedded steel plate.
Preferably, the first upright posts are at least four, and a plurality of the first upright posts are all arranged as steel pipes.
Preferably, the plurality of first parallel channel steel and the plurality of first diagonal braces are all set as [14a channel steel.
Preferably, the plurality of cushion beams are all arranged as double-spliced I40a I-steel.
Preferably, the support I-steel is provided with a plurality of support I-steel, the support I-steel is equidistantly arranged relative to the bolster, the height of the support I-steel is 25cm-35cm, and the support I-steel is I20I-steel.
Preferably, the distribution beam is arranged as double-spliced I40a I-steel, and the whole length of the distribution beam is covered on the top surface of the steel box girder web of the U-shaped bottom steel box girder section.
Preferably, a reinforcing rod is mounted at the lower part of the distribution beam, and the lower wall of the reinforcing rod is clung to the upper wall of the U-shaped bottom layer steel box girder segment.
Preferably, the second upright posts are four, and the second upright posts are all steel pipes.
Preferably, the plurality of second parallel channel steel and the plurality of second diagonal braces are both set as [14a channel steel.
The application also provides a construction method of the upper and lower cross brackets of the steel box girder, which comprises the following steps:
S1, determining a vertical crossing area of an upper layer steel structure beam and a lower layer steel structure beam, erecting a steel pipe bracket according to a special construction scheme for installing the steel structure box beam, leveling and compacting a site at the position of a lofting bracket, testing and detecting the bracket stress under the condition that the bearing capacity of a foundation meets the least adverse working condition, and pouring a C25 concrete foundation by a formwork after the foundation is detected to be qualified, wherein the concrete foundation corresponds to a pre-buried steel plate at a steel pipe column, and a split heads rib is welded at the bottom of the steel plate and penetrates into a concrete core for fixing the pre-buried steel plate;
S2, integrally manufacturing and forming a steel pipe column support, wherein a main pipe is a phi 426 multiplied by 8mm steel pipe, inclined struts and parallel joints are respectively formed by adopting [14a channel steel ], the main pipe, the inclined struts and the parallel joints are integrally connected on the ground one by one according to 6-9 m section, the column support is mounted after being welded and formed, the first section of integral support is fully welded and fixed with a steel plate pre-embedded in a C25 concrete foundation, the stability of the support is ensured, then the column support is continuously mounted to the designed height, and the support are integrally connected by welding;
S3, mounting a vertical column support to a designed height, and then mounting a top longitudinal and transverse beam, wherein the beam adopts double-spliced I40a I-steel, and the I20I-steel with the height of 30cm is vertically and uniformly arranged on the longitudinal and transverse beam;
S4, erecting low-layer steel box girder segments in a left-right symmetrical mode in stages after the bracket is installed, welding after the installation of each segment is completed, and dismantling the low-layer bracket after the welding is completed, wherein the steel-concrete composite girder is U-shaped, a double-spliced I40a I-shaped steel distribution girder is transversely placed and welded on the U-shaped top surface of the steel-concrete girder in a general transverse and through-length mode, and the distribution girder must cover the top surface of a steel-concrete girder web in a through-length mode, so that stress is uniform;
S5, distributing Liang Dashe top layer reinforced concrete composite beam supports on double-spliced I40a I-steel, spot welding the distribution beams and the tops of U-shaped webs, welding the supports and the top surfaces of the I40a I-steel to prevent the supports from sliding, installing the supports in the same way, and erecting and welding the top layer reinforced concrete composite beam sections after the installation is completed.
Preferably, in step S4, in order to ensure the safety and stability of the lower-layer reinforced concrete beam structure and avoid deformation of the "U" -shaped web structure, a circular column or I-beam is welded to the web facade immediately below the I40a I-beam distribution beam for structural reinforcement, the lower part of the circular column or I-beam column is tightly attached to the reinforced concrete beam bottom plate, the top is tightly attached to the reinforced concrete Liang Dingyi edge plate, and then the reinforcing structure is transversely connected by adopting the same type I-beam, so that the U "-shaped web of the reinforced concrete beam forms a square integral stress structure.
Preferably, the method further comprises the step S6 of directly cutting the I20I-steel with the height of 30cm by a cutting machine after the whole welding of the upper layer steel-concrete beam is finished after the upper layer support, the lower layer support and the steel-concrete beam are formed, dismantling the upper layer support and the double-spliced I40a I-steel distribution beam after the unloading is finished, dismantling the I-steel processed in the web plate of the lower layer steel-concrete beam, and then dismantling the lower layer upright post support, wherein the whole support dismantling sequence is opposite to the erection sequence.
The application has the beneficial effects that the support structure and the construction method for the up-down cross construction of the steel box girder have the advantages that the first support module is firstly used for supporting the bottom layer steel box girder segment, the bolster, the support I-steel and the distribution beam are arranged on the bottom layer steel box girder segment, then the second support module is arranged on the upper part of the distribution beam, and finally the upper layer steel box girder is arranged on the upper part of the second support module, so that the construction mode of the lower layer box girder and the upper layer box girder is realized, the construction period is shortened, and the construction efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:
Fig. 1 is a schematic front view in section of a steel box girder up-down crossing construction bracket structure provided according to an embodiment of the present application;
fig. 2 is an enlarged schematic view of a bolster portion structure of a steel box girder up-down crossing construction support structure according to an embodiment of the present application;
Fig. 3 is a schematic cross-sectional view of a portion of a concrete foundation layer of a steel box girder up-down crossing construction support structure according to an embodiment of the present application.
In the figure: 100. a first rack module; 110. a first upright; 120. a first parallel channel steel; 130. a first diagonal brace; 200. a bolster; 210. supporting I-steel; 220. u-shaped bottom layer steel box girder segments; 230. a distribution beam; 231. a reinforcing rod; 300. a second rack module; 310. a second upright; 320. a second parallel channel steel; 330. a second diagonal brace; 400. a concrete foundation layer; 410. embedding a steel plate; 420. and (5) a split heads rib.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
Referring to fig. 1 to 3, the present application provides a steel box girder up-down crossing construction support structure including a first support module 100, a bolster 200, and a second support module 300.
Referring to fig. 1, the first bracket module 100 is provided with a plurality of first stand columns 110, a plurality of first parallel channel steel 120 and a plurality of first diagonal braces 130, when the first bracket module 100 is specifically provided, the first stand columns 110 are provided with at least four first stand columns 110, the plurality of first stand columns 110 are all provided with steel pipes, the steel pipes are provided with phi 426×8mm steel pipes, the plurality of first parallel channel steel 120 are respectively welded between two adjacent first stand columns 110, the plurality of first diagonal braces 130 are respectively welded at the welding positions between the first parallel channel steel 120 and the first stand columns 110, and when the first bracket module is specifically provided, the plurality of first parallel channel steel 120 and the plurality of first diagonal braces 130 are all provided with [14a channel steel, so that a good and stable supporting effect is integrally achieved.
Referring to fig. 1 and 2, when the bolster 200 is mounted on the upper portions of the first bracket modules 100, the bolster 200 is configured as double-spliced I40a I-beams, when the bolster 200 is mounted on the upper portions of the bolster 200 by welding, the support I-beams 210 are configured as a plurality of support I-beams 210, the support I-beams 210 are equidistantly disposed with respect to the bolster 200, the support I-beams 210 are 25cm-35cm in height, the support I-beams 210 are I20I-beams, the support I-beams 210 have a good supporting effect, and when the bolster is subsequently detached, the detachment can be completed by cutting off the welded portions, the U-shaped bottom steel box girder segments 220 are erected on the upper portions of the support I-beams 210, and the distribution beams 230 are erected on the upper portions of the U-shaped bottom steel box girder segments 220.
In this embodiment, the distribution beam 230 is configured as double-spliced I40a I-steel, the distribution beam 230 is covered on the top surface of the steel box girder web of the U-shaped bottom steel box girder segment 220 in a long way, the lower part of the distribution beam 230 is provided with a reinforcing rod 231, and the reinforcing rod 231 is configured as a circular upright post or I-steel, so that the stress is more uniform, and the lower wall of the reinforcing rod 231 is tightly attached to the upper wall of the U-shaped bottom steel box girder segment 220.
Referring to fig. 1, the second bracket module 300 is provided with a plurality of second stand columns 310, a plurality of second parallel channel steel 320 and a plurality of second diagonal braces 330, when the second bracket module 300 is specifically provided, the second stand columns 310 are provided with four, the second stand columns 310 are all provided with steel pipes, the plurality of second stand columns 310 are erected on the upper portion of the distribution beam 230, the plurality of second parallel channel steel 320 are respectively welded between two adjacent second stand columns 310, the plurality of second diagonal braces 330 are respectively welded at the welding positions between the second parallel channel steel 320 and the second stand columns 310, and when the second bracket module 300 is specifically provided, the plurality of second parallel channel steel 320 and the plurality of second diagonal braces 330 are all provided with [14a channel steel.
Referring to fig. 1 and 3, the concrete foundation layer 400 is further included, an embedded steel plate 410 is disposed on the upper portion of the concrete foundation layer 400, split heads ribs 420 are welded on the embedded steel plate 410, the split heads 420 extend into the concrete foundation layer 400, a plurality of first upright posts 110 are welded on the upper portion of the embedded steel plate 410, and good support for the first upright posts 110 is achieved by the embedded steel plate 410.
Specifically, the structural principle of the support structure for the up-down cross construction of the steel box girder is as follows: when the steel box girder is used, the vertical intersection area (orthographic projection intersection area) of the upper layer steel box girder and the lower layer steel box girder is determined, after the foundation is detected to be qualified, a C25 concrete foundation is poured by a formwork, the concrete foundation corresponds to an embedded steel plate 410 at a steel pipe column, and a split heads rib 420 is welded at the bottom of the embedded steel plate 410 to penetrate into a concrete core, so that the embedded steel plate 410 is fixed;
The first stand column 110, the first diagonal brace 130 and the first parallel channel steel 120 are integrally connected on the ground one by one according to the sections of 6m-9m, the first stand column 100 and the embedded steel plate 410 are fully welded and fixed, the stability of the first stand column 100 is guaranteed, then the first stand column 100 is continuously installed to the designed height, and a plurality of first stand column modules 100 are integrally connected by welding;
the first bracket module 100 is installed to the designed height and then is provided with a top longitudinal and transverse beam 200, and the longitudinal and transverse beam 200 is vertically and uniformly provided with an installation support I-steel 210;
The U-shaped bottom steel box girder segments 220 are erected symmetrically left and right in stages after the first bracket module 100 is installed, all segments are welded after the installation is completed, the distribution girder 230 is placed and welded on the transverse through length of the U-shaped bottom steel box girder segments 220, the distribution girder 230 covers the top surface of a steel box girder web plate in a through length mode, so that stress is uniform, at the moment, in order to ensure the safety and stability of a low-layer steel box girder structure, the structural deformation of the U-shaped web plate is avoided, a round upright post or I-shaped steel is welded on the vertical surface of the web plate under the distribution girder 230 for structural reinforcement, the lower part of the round upright post or I-shaped steel column is tightly attached to the bottom plate of the steel box girder, the top is tightly attached to the top flange plate of the steel box girder, and then the reinforcing structure is transversely connected by adopting I-shaped steel of the same type, so that the U-shaped web plate of the steel box girder forms a square integral stress structure;
Distributing Liang Dashe the second bracket module 300 on the double-spliced I40a I-steel, installing the second bracket module 300 in the same way, erecting the top layer steel box girder segment after the installation is completed, and welding;
And after the whole upper layer steel box girder is welded, the cutting machine directly cuts and supports the I-steel 210, the second bracket module 300 and the distribution beam 230 are dismantled after the force unloading is finished, the I-steel is processed in the web plate of the lower layer steel box girder, and then the lower layer upright post brackets are dismantled, and the whole bracket dismantling sequence is opposite to the erection sequence.
The application also provides a construction method of the upper and lower cross brackets of the steel box girder, which comprises the following steps:
S1, determining a vertical crossing area of an upper layer steel structure beam and a lower layer steel structure beam, erecting a steel pipe bracket according to a special construction scheme for installing the steel structure box beam, leveling and compacting a site at the position of a lofting bracket, testing and detecting the bracket stress under the condition that the bearing capacity of a foundation meets the least adverse working condition, and pouring a C25 concrete foundation by a formwork after the foundation is detected to be qualified, wherein the concrete foundation corresponds to a pre-buried steel plate at a steel pipe column, and a split heads rib is welded at the bottom of the steel plate and penetrates into a concrete core for fixing the pre-buried steel plate;
S2, integrally manufacturing and forming a steel pipe column support, wherein a main pipe is a phi 426 multiplied by 8mm steel pipe, inclined struts and parallel joints are respectively formed by adopting [14a channel steel ], the main pipe, the inclined struts and the parallel joints are integrally connected on the ground one by one according to 6-9 m section, the column support is mounted after being welded and formed, the first section of integral support is fully welded and fixed with a steel plate pre-embedded in a C25 concrete foundation, the stability of the support is ensured, then the column support is continuously mounted to the designed height, and the support are integrally connected by welding;
S3, mounting a vertical column support to a designed height, and then mounting a top longitudinal and transverse beam, wherein the beam adopts double-spliced I40a I-steel, and the I20I-steel with the height of 30cm is vertically and uniformly arranged on the longitudinal and transverse beam;
S4, erecting low-layer steel box girder segments in a left-right symmetrical mode in stages after the bracket is installed, welding after the installation of each segment is completed, and dismantling the low-layer bracket after the welding is completed, wherein the steel-concrete composite girder is U-shaped, a double-spliced I40a I-shaped steel distribution girder is transversely placed and welded on the U-shaped top surface of the steel-concrete girder in a general transverse and through-length mode, and the distribution girder must cover the top surface of a steel-concrete girder web in a through-length mode, so that stress is uniform;
S5, distributing Liang Dashe top layer reinforced concrete composite beam supports on double-spliced I40a I-steel, spot welding the distribution beams and the tops of U-shaped webs, welding the supports and the top surfaces of the I40a I-steel to prevent the supports from sliding, installing the supports in the same way, and erecting and welding the top layer reinforced concrete composite beam sections after the installation is completed.
In this embodiment, in step S4, in order to ensure the safety and stability of the lower-layer steel concrete beam structure and avoid the deformation of the "U" web structure, a circular column or I-beam is welded directly under the I40a I-beam distribution beam and closely attached to the web vertical surface to strengthen the structure, the lower part of the circular column or I-beam column is closely attached to the steel concrete beam bottom plate, the top is closely attached to the steel concrete Liang Dingyi edge plate, and then the reinforcing structure is transversely connected by adopting the same type I-beam, so that the U "web of the steel concrete beam forms a square integral stress structure.
In this embodiment, the method further includes step S6, after the upper layer of support, the lower layer of support and the reinforced concrete beam are formed, after the whole welding of the upper layer of reinforced concrete beam is completed, the cutting machine is adopted to directly cut the I20I-steel with the height of 30cm and uniformly distributed on the transverse cushion beam, after the force unloading is completed, the upper layer of support and the double-spliced I40a I-steel distribution beam are removed, the I-steel is processed in the web plate of the lower layer of reinforced concrete beam, then the lower layer of upright post support is removed, and the whole support removal sequence is opposite to the erection sequence.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The utility model provides a steel case roof beam is alternately construction supporting structure from top to bottom which characterized in that includes:
the first support modules comprise a plurality of first upright posts, a plurality of first parallel channel steel and a plurality of first diagonal braces, wherein the first parallel channel steel is welded between two adjacent first upright posts respectively, and the first diagonal braces are welded at the welding positions between the first parallel channel steel and the first upright posts respectively;
the bolster is arranged at the upper parts of the plurality of first bracket modules, the upper parts of the bolster are provided with support I-steel, the upper parts of the support I-steel are provided with U-shaped bottom layer steel box girder sections, and the upper parts of the U-shaped bottom layer steel box girder sections are provided with distribution beams;
The second bracket modules comprise a plurality of second upright posts, a plurality of second parallel channel steel and a plurality of second diagonal braces, the second upright posts are arranged on the upper part of the distribution beam, the second parallel channel steel is welded between two adjacent second upright posts respectively, and the second diagonal braces are welded at the welding positions between the second parallel channel steel and the second upright posts respectively;
The concrete foundation layer is characterized by further comprising a concrete foundation layer, wherein an embedded steel plate is arranged at the upper part of the concrete foundation layer, split heads are welded on the embedded steel plate, the split heads extend into the concrete foundation layer, and a plurality of first upright posts are welded at the upper parts of the embedded steel plate;
The support I-steel is provided with a plurality of support I-steel, a plurality of support I-steel is equidistant for the bolster sets up, and a plurality of support I-steel highly all is 25cm-35cm, a plurality of support I-steel all is I20I-steel.
2. The steel box girder up-down crossing construction support structure according to claim 1, wherein at least four first upright posts are provided, and a plurality of the first upright posts are all provided as steel pipes.
3. The steel box girder up-down crossing construction support structure according to claim 1, wherein a plurality of the first parallel channel steel and a plurality of the first diagonal braces are all arranged as [14a channel steel.
4. The steel box girder up-down crossing construction support structure according to claim 1, wherein a plurality of the bolster are all arranged as double-spliced I40a I-steel.
5. The steel box girder up-down crossing construction support structure according to claim 1, wherein the distribution girder is double-spliced I40a I-steel, the whole length of the distribution girder is covered on the top surface of a steel box girder web plate of the U-shaped bottom layer steel box girder section, a reinforcing rod is arranged at the lower part of the distribution girder, and the lower wall of the reinforcing rod is tightly attached to the upper wall of the U-shaped bottom layer steel box girder section.
6. A construction method of a steel box girder up-down crossing bracket for performing construction of the steel box girder up-down crossing construction bracket structure according to any one of claims 1 to 5, comprising the steps of:
S1, determining a vertical crossing area of an upper layer steel structure beam and a lower layer steel structure beam, erecting a steel pipe bracket according to a special construction scheme for installing the steel structure box beam, leveling and compacting a site at the position of a lofting bracket, testing and detecting the bracket stress under the condition that the bearing capacity of a foundation meets the most adverse working condition, supporting a mould to pour a C25 concrete foundation after the foundation is detected to be qualified, embedding a steel plate at the position of the concrete foundation corresponding to a steel pipe upright post, and welding split heads and ribs at the bottom of the steel plate to penetrate into a concrete core;
S2, integrally manufacturing and forming a steel pipe column support, wherein a main pipe is a phi 426 multiplied by 8mm steel pipe, inclined struts and parallel joints are respectively formed by adopting [14a channel steel, the main pipe, the inclined struts and the parallel joints are integrally connected on the ground one by one according to 6-9 m section by section, the column support is mounted after being welded and formed, the first section of integral support is fully welded and fixed with a steel plate pre-embedded in a C25 concrete foundation, and then the column support is continuously mounted to the designed height, and the support are integrally connected by welding;
s3, mounting a vertical column support to a designed height, and then mounting a top longitudinal and transverse beam, wherein the beam adopts double-spliced I40a I-steel, and the I20I-steel with the height of 30cm is vertically and uniformly arranged on the longitudinal and transverse beam;
S4, erecting the sections of the low-layer steel box girder in a left-right symmetrical mode in stages after the bracket is installed, welding after the installation of each section is completed, and removing the low-layer bracket after the welding is completed, wherein the steel-concrete composite girder is U-shaped, a double-spliced I40a I-shaped steel distribution girder is transversely placed and welded on the U-shaped top surface of the steel-concrete girder in a general transverse and through manner, and the distribution girder must cover the top surface of a steel-concrete girder web in a through manner;
S5, distributing Liang Dashe top layer reinforced concrete composite beam supports on double-spliced I40a I-steel, spot welding the distribution beams and the tops of U-shaped webs, welding the supports and the top surfaces of the I40a I-steel to prevent the supports from sliding, installing the supports in the same way, and erecting and welding the top layer reinforced concrete composite beam sections after the installation is completed.
7. The construction method of the upper and lower cross supports of the steel box girder according to claim 6, wherein in the step S4, a round upright post or I-steel is welded under the I40a I-steel distribution girder and clung to the web vertical surface for structural reinforcement, the lower part of the round upright post or I-steel column clung to the steel-concrete girder bottom plate, the top of the round upright post or I-steel column clung to the steel-concrete Liang Dingyi flange plate, and then the reinforcing structure is transversely connected by adopting the I-steel of the same type, so that the U-shaped web of the steel-concrete girder forms a square integral stress structure.
8. The construction method of the upper and lower cross supports of the steel box girder according to claim 6, further comprising the step S6, after the upper layer support, the lower layer support and the reinforced concrete girder are formed, after the whole welding of the upper layer reinforced concrete girder is finished, the I20I-steel with the height of 30cm is vertically and uniformly arranged on the transverse cushion girder by adopting a cutting machine, after the force unloading is finished, the upper layer support and the double I-steel distribution beam with the height of 40 cm are removed, the I-steel is processed in the web plate of the lower layer reinforced concrete girder, then the lower layer upright post support is removed, and the whole support is removed in the reverse order with the erection order.
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