CN111648246B - Construction method for building medium and large steel truss girder - Google Patents
Construction method for building medium and large steel truss girder Download PDFInfo
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- CN111648246B CN111648246B CN202010470510.0A CN202010470510A CN111648246B CN 111648246 B CN111648246 B CN 111648246B CN 202010470510 A CN202010470510 A CN 202010470510A CN 111648246 B CN111648246 B CN 111648246B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D6/00—Truss-type bridges
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Abstract
A construction method for building a medium-large steel truss girder relates to the technical field of bridge construction and comprises the following steps: s1, constructing at least two pairs of pier studs; s2, building a first sliding support platform on an extension line at one end of each pair of pier stud connecting lines; s3, dragging the steel beam along the first sliding support platform to be in place for installation; s4, building a steel truss girder sliding platform: erecting second sliding support platforms at two adjacent first sliding support platforms; the method for erecting the second sliding support platform comprises the following steps: the first sliding support platform is upwards connected to be as high as the upper end face of the steel beam; s5, transversely moving the steel truss girder along the steel truss girder sliding platform to be installed in place; s6, dismantling the steel truss girder sliding platform.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method for constructing a medium-large steel truss girder.
Background
When the bridge is constructed across the existing railway, the frame pier is used as a bearing seat of the truss girder at the upper end, after the bridge crosses the existing railway, the single pier support with equal spacing is used as the bearing seat, and the steel truss girder structure is a common bridge structure in the national traffic infrastructure and is usually used for large or super large span bridge structures; the frame pier comprises a pier stud and a steel beam and is usually used for the construction condition of a lower-span existing road or railway, and after the pier stud is poured, the steel beam is hoisted in place by one step by a crane in a common operation method after the direct splicing is finished; the steel trusses are constructed in place in a manner that generally includes: (1) the method is characterized in that a sliding rail system is installed on a constructed steel truss section in the longitudinal direction, the steel truss to be constructed is pushed to a beam falling position on a pier column from the sliding rail system, and the application range is wide; (2) assembling construction of cantilever unit sections, the method generally takes two ends of a constructed steel truss girder as starting points, and the construction is outwards assembled section by section and is applied to river flow construction across rivers and rivers; (3) the method is that after the steel truss girder is assembled, the steel truss girder is directly hoisted and installed on a pier base and is commonly used for the construction of the steel truss girder with medium and small span; when the existing railway is spanned on the steel truss girder, the train running density on a railway business line is high, the surrounding environment is complex, the stability of the steel truss girder and the steel beam in the construction process needs to be controlled during the construction of the business line, and the influence on the business line is reduced; the business line is arranged below the bridge span, construction needs to be strictly controlled, and high-altitude falling objects are avoided, so that the construction of the steel beam does not have the conditions of in-place assembling or hoisting installation, and meanwhile, the steel truss does not have the conditions of in-place assembling and longitudinal dragging (pushing) construction.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a construction method for constructing a medium-large steel truss girder.
The invention provides a construction method for constructing a medium-large steel truss girder, which sequentially comprises the following steps:
s1, constructing at least two pairs of pier studs: the pier columns are formed by pouring concrete, and each pair of pier columns stretches across two sides of a bridge road;
s2, building a first sliding support platform (2) on an extension line at one end of each pair of pier stud connection lines, ensuring that the length direction of the first sliding support platform (2) is in the same direction with the connection lines of the pier studs in the pair during building, and ensuring that the first sliding support platform (2) is positioned on the same side of the longitudinal bridge direction;
s3, assembling a steel beam on the first sliding support platform, dragging the steel beam to the pier stud along the first sliding support platform to be installed in place, and completing construction of a frame pier structure consisting of the pair of pier studs and the steel beam;
s4, building a steel truss girder sliding platform:
respectively erecting a second sliding support platform at two adjacent first sliding support platforms, wherein the steel truss girder sliding support platform is used for sliding the steel truss girder to the steel cross beam;
the method for erecting the second sliding support platform comprises the following steps: the first sliding support platform is upwards raised to be equal to the height of the upper end face of the steel cross beam;
s5, assembling the steel truss girder on the steel truss girder sliding platform, and transversely moving the steel truss girder along the steel truss girder sliding platform to be installed in place;
s6, dismantling the steel truss girder sliding platform.
On the basis of the technical proposal, the device comprises a shell,
preferably, in step S2, the method for setting up the first sliding support platform includes: connecting a steel pipe to a drilled pile for construction, arranging first double-spliced steel sections on the top of the steel pipe in the longitudinal direction of a bridge, erecting first slide way beams on the first double-spliced steel sections in the transverse direction of the bridge, and finishing the erection of a first sliding support platform;
erecting a guide beam dismantling platform which is as high as the pier column on the other side of each pair of pier columns, and installing second transverse bridge slideway beams on the tops of the pier columns and the guide beam dismantling platforms;
the central lines of the first slideway beam and the second slideway beam in the length direction are overlapped.
Preferably, in step S3, after the steel beam is assembled, a guide beam is installed at an end of the steel beam facing the pier seat, and then the steel beam and the guide beam synchronously fall on the first slideway beam, the steel beam is pulled, so that the steel beam is moved to a pier column along the first slideway beam and the second slideway beam in place, the guide beam dismantling platform and the second slideway beam are dismantled, and the steel beam falls on the pier column and is installed.
Preferably, in step S4, the method for setting up the second sliding support platform specifically includes: and (3) dismantling the first slideway beam, upwards heightening the steel pipe, arranging second double-spliced section steel at the top of the heightened steel pipe in the longitudinal bridge direction, and installing third slideway beams at the upper ends of the second double-spliced section steel and the steel beam, wherein the installation direction of the third slideway beams is still in the transverse bridge direction.
Preferably, in step S5, after the steel trussed beam is assembled, the concrete method of transversely moving the steel trussed beam along the steel trussed beam sliding platform in place for installation includes: and the steel cross beam is lapped on the two third slideway beams to drag and transversely move until two ends of the steel truss beam fall on the steel cross beam, the steel truss beam transversely moves in place, the steel truss beam is jacked, and the steel truss beam falls in place after the third slideway beams are removed.
On the basis of the technical proposal, the device comprises a shell,
preferably, in step S3, after the steel beam is moved to the pier column along the first and second skid beams to be in place, the steel beam is lifted by a jacking device, the guide beam dismantling platform and the second skid beam are dismantled, supports are installed on the two steel beams, the jacking device is lowered, the steel beam is located on the supports, and the jacking device is dismantled; and finally, pouring a connecting section of the pier top and the steel beam to form permanent consolidation, and completing construction of the steel beam and the pier stud.
Preferably, in step S5, after the steel truss is transversely moved to a proper position, the steel truss is horizontally lifted by a jacking device, a cushion block is stacked beside the jacking device, the cushion block is stacked by stacking a plurality of cushion plates, and after the third slideway beam is removed, the steel truss falls into the beam for construction, specifically: the beam falling distance uniformly descends in a grading mode, the falling of the jacking device and the drawing of the base plate are alternately completed, then the support is installed on the steel beam, the support is fixed after the steel truss beam is accurately in place, and the steel truss beam falling is installed in place.
Preferably, in step S2, the construction method for connecting the steel pipe to the bored pile includes: the method comprises the steps of drilling on the ground, pouring concrete to form a cast-in-situ bored pile, building a pouring bearing platform at the upper end of the cast-in-situ bored pile, embedding a steel plate on the top of the bearing platform, connecting steel pipes with the embedded plate on the top of the bearing platform, welding stiffening plates on the periphery of the steel pipes, arranging a top plate on the top of the steel pipes, and connecting all the steel pipes into a whole through the top plate.
In addition, the role of the return line in the railway track construction is as follows: partial current flows back to the traction substation through the return line, so that the shielding effect is increased on the adjacent communication line, the impedance of a traction network is reduced, and the voltage at the tail end of the power supply arm is increased.
The invention has the advantages that:
1. the invention is suitable for the existing railway construction of large-span and extra-large-span bridge spans, has complex geographical positions and working conditions without in-place assembly, hoisting in-place installation and longitudinal dragging (pushing) construction, adopts a transverse dragging construction method, avoids business lines, can ensure the normal and safe operation of the existing railway, and has high safety factor and good stability.
2. According to the invention, the sliding support platform is built on one side of the pier stud, the slide way is installed, the assembled steel cross beam and the guide beam are welded on the sliding support platform, and the sliding support platform is pulled in place after the assembly is finished, so that the weight is not required to be increased in the pulling process, and the sliding support platform is pulled in place after the assembly is finished, so that the safety coefficient is high; in addition, the sliding support platform is upwards connected, the steel trusses are also assembled at a high position on the sliding support platform, and the sliding support platform between adjacent pier studs is utilized to directly transversely move the falling beam in place, so that the influence of the sliding support platform and welding construction on the existing railway is reduced; in addition, the remote high-position assembly can adopt large-scale mechanical auxiliary operation, and the work efficiency of construction operation is improved.
3. According to the invention, the sliding support platform can be used for the second time, after the transverse movement construction of the steel beam is finished, the sliding support platform is connected upwards, the sliding construction of the steel truss beam can be carried out, the construction steps are simplified, and therefore, the efficiency is greatly improved.
4. According to the invention, the guide beam is arranged at the end part of the steel beam, and the two ends of the steel truss beam are erected on the sliding support platform, so that no additional counter weight is needed in the whole process of the transverse moving construction, the influence on the existing railway can be reduced in the transverse moving construction process, and the safety of the existing railway is improved.
Drawings
Fig. 1 is a construction state diagram of a first sliding support platform and a guide beam dismantling platform which are built in step S2 in embodiment 2 of the present invention.
Fig. 2 is a construction state diagram of the steel beam and the guide beam constructed in step S3 in embodiment 2 of the present invention.
FIG. 3 is a view showing a construction state in which the steel beam is transversely moved at step S3 in example 2 of the present invention.
FIG. 4 is a construction diagram after the steel beam is transversely moved into position at step S3 in embodiment 2 of the present invention.
Fig. 5 is a construction state diagram of the consolidation connection of the steel beam and the pier stud at step S3 in embodiment 2 of the present invention.
Fig. 6 is a construction state diagram of building the second sliding support platform in step S4 in embodiment 2 of the present invention.
Fig. 7 is a first construction state diagram of the steel girder in the traverse moving state in step S5 in embodiment 2 of the present invention.
Fig. 8 is a second construction state diagram of the steel girder in the traverse moving state in step S5 in embodiment 2 of the present invention.
Fig. 9 is a diagram of a state in which the steel truss girder is completely installed in place at step S5 in embodiment 2 of the present invention.
Fig. 10 is a construction state diagram of step S6 in embodiment 2 of the present invention.
Wherein like parts are designated by like reference numerals throughout the several views; the figures are not drawn to scale.
Detailed Description
The invention is further illustrated by the following figures and examples.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Example 1
The invention provides a construction method for constructing a medium-large steel truss girder, which sequentially comprises the following steps:
s1, constructing at least two pairs of pier studs: the pier columns are formed by pouring concrete, and each pair of pier columns stretches across two sides of a bridge road;
s2, building a first sliding support platform (2) on an extension line at one end of each pair of pier stud connection lines, ensuring that the length direction of the first sliding support platform (2) is in the same direction with the connection lines of the pier studs in the pair during building, and ensuring that the first sliding support platform (2) is positioned on the same side of the longitudinal bridge direction;
the method for erecting the first sliding support platform comprises the following steps: connecting a steel pipe to a drilled pile for construction, arranging first double-spliced steel sections on the top of the steel pipe in the longitudinal direction of a bridge, erecting first slide way beams on the first double-spliced steel sections in the transverse direction of the bridge, and finishing the erection of a first sliding support platform;
erecting a guide beam dismantling platform which is as high as the pier column on the other side of each pair of pier columns, and installing second transverse bridge slideway beams on the tops of the pier columns and the guide beam dismantling platforms;
the central lines of the first slideway beam and the second slideway beam in the length direction are overlapped;
the construction method for connecting the steel pipe to the drilled pile comprises the following steps: after drilling on the ground, pouring concrete to form a cast-in-situ bored pile, building a pouring bearing platform at the upper end of the cast-in-situ bored pile, pre-burying a steel plate on the top of the bearing platform, connecting the steel pipes with the pre-buried plate on the top of the bearing platform, welding stiffening plates at the periphery of the steel pipes, arranging a top plate on the top of the steel pipes, and connecting all the steel pipes into a whole by the top plate;
s3, assembling a steel cross beam on the first sliding support platform, after the assembly of the steel cross beam is completed, installing a guide beam at the end part of the steel cross beam facing the pier seat, then synchronously dropping the steel cross beam and the guide beam on the first slideway beam, dragging the steel cross beam so as to transversely move the steel cross beam to a pier column to be in place along the first slideway beam and the second slideway beam, then jacking the steel cross beam by using a jacking device, then dismantling the guide beam, the guide beam dismantling platform and the second slideway beam, installing supports on the two steel cross beams, descending the jacking device, positioning the steel cross beam on the supports, and dismantling the jacking device; finally, pouring a connecting section of the pier top and the steel beam to form permanent consolidation, and completing construction of the steel beam and the pier stud;
s4, building a steel truss girder sliding platform:
a second sliding support platform is respectively erected at the two adjacent first sliding support platforms,
the method for erecting the second sliding support platform specifically comprises the following steps: the first slideway beam is dismantled, the steel pipe is upwards connected to be high, second double-spliced section steel is arranged in the longitudinal bridge direction at the top of the steel pipe after the steel pipe is connected to be high, a third slideway beam is arranged at the upper ends of the second double-spliced section steel and the steel cross beam, and the installation direction of the third slideway beam is still in the transverse bridge direction;
s5, assembling the steel trussed beam on the steel trussed beam sliding platform, wherein after the steel trussed beam is assembled, the concrete method for transversely moving the steel trussed beam along the steel trussed beam sliding platform to be installed in place comprises the following steps: the steel crossbeam is taken two dragging and traversing on the third slide way beam until the two ends of the steel truss beam fall on the steel crossbeam, the steel truss beam traverses and takes one place, then, the jacking device is used for jacking the steel truss beam horizontally, and meanwhile, cushion blocks are stacked beside the jacking device and stacked by a plurality of cushion plates, after the third slide way beam is dismantled, the steel truss beam falling construction specifically comprises the following steps: the beam falling distance is uniformly reduced in a grading manner, the falling of the jacking device and the extraction of the base plate are alternately completed, then the support is installed on the steel beam, the support is fixed after the steel truss beam is accurately in place, and the steel truss beam falling is installed in place;
s6, dismantling the steel truss girder sliding platform.
In addition, the role of the return line in the railway track construction is as follows: partial current flows back to the traction substation through the return line, so that the shielding effect is increased on the adjacent communication line, the impedance of a traction network is reduced, and the voltage at the tail end of the power supply arm is increased.
The embodiment of the invention has the advantages that:
1. the invention is suitable for the existing railway construction of large-span and extra-large-span bridge spans, has complex geographical positions and working conditions without in-place assembly, hoisting in-place installation and longitudinal dragging (pushing) construction, adopts a transverse dragging construction method, avoids business lines, can ensure the normal and safe operation of the existing railway, and has high safety factor and good stability.
2. According to the invention, the sliding support platform is built on one side of the pier stud, the slide way is installed, the assembled steel cross beam and the guide beam are welded on the sliding support platform, and the sliding support platform is pulled in place after the assembly is finished, so that the weight is not required to be increased in the pulling process, and the sliding support platform is pulled in place after the assembly is finished, so that the safety coefficient is high; in addition, the sliding support platform is upwards connected, the steel trusses are also assembled at a high position on the sliding support platform, and the sliding support platform between adjacent pier studs is utilized to directly transversely move the falling beam in place, so that the influence of the sliding support platform and welding construction on the existing railway is reduced; in addition, the remote high-position assembly can adopt large-scale mechanical auxiliary operation, and the work efficiency of construction operation is improved.
3. According to the invention, the sliding support platform can be used for the second time, after the transverse movement construction of the steel beam is finished, the sliding support platform is connected upwards, the sliding construction of the steel truss beam can be carried out, the construction steps are simplified, and therefore, the efficiency is greatly improved.
4. According to the invention, the guide beam is arranged at the end part of the steel beam, and the two ends of the steel truss beam are erected on the sliding support platform, so that no additional counter weight is needed in the whole process of the transverse moving construction, the influence on the existing railway can be reduced in the transverse moving construction process, and the safety of the existing railway is improved.
Example 2
In the embodiment 2 of the invention, the number of the pier studs is two pairs as an example, the sliding support platform is erected on the same side of the two pairs of pier studs, and the construction of the transverse movement of the steel beam and the transverse movement of the steel truss beam is explained in detail, wherein the reference numeral of the lower-crossing existing railway in the attached drawing is 9.
The construction method for constructing the steel truss girder 8 and the frame pier steel beam 4 specifically comprises the following steps:
s1: no. 23-24 paired pier column construction, wherein the reference numbers in the drawings are as follows: pier nos. 1-23 and 6-24, wherein the pier nos. 23 and 24 have the same structure, and therefore are labeled together.
S2: the left sides of No. 23 and No. 24 pier tops are both provided with a first sliding support platform 2 with the same height as the pier tops,
the support design of the first sliding support platform 2 is as follows: arranging 1 row of steel pipe supports at the left 10m of the left pier body of the pier column, then arranging 1 row of supports every 6m, and arranging 9 rows of supports in total; the support foundation is a bored pile foundation, concrete is poured to form a bored pile after ground drilling, a pouring bearing platform is built at the upper end of the bored pile, a steel plate with the thickness of 20mm is pre-embedded on the top surface of the bearing platform, the steel pipe is connected with a pre-embedded plate on the top of the bearing platform, a stiffening plate is welded on the periphery of the steel pipe, a top plate with the thickness of 20mm is arranged on the top of the steel pipe, all the steel pipes are connected into a whole, first double-spliced steel with the specification of 700 multiplied by 300mm is arranged in the longitudinal bridge direction of the top of the steel pipe, a first slide way beam is transversely bridged on the first double-spliced steel, the width of the first slide way beam is 2.0m, the height of the first slide way beam is 56cm, a slide block is arranged on the first slide way beam, the bottom elevation of the steel beam 4 is adjusted by paving steel plates with different thicknesses on the slide block, and the requirement of the pre-camber of the steel beam 4 is met;
after first support platform 2 that slides sets up the completion, set up on the right side of pier stud with platform 3 is demolishd to high nose girder such as pier stud, the nose girder is demolishd platform 3 and is adopted steel pipe support to set up, and steel pipe support establishes two rows, and the interval is 7.0m, and first row of support steel pipe is apart from right side pier shaft 5.3m, and thickness 10mm roof is established on the steel pipe top, transversely establishes 40I-steel on the roof, and the I-steel top vertically establishes double-spliced 20 channel-section steel, channel-section steel interval 2.0m, at last at the pier stud top with the nose girder demolishs the second slide roof beam of installation transverse bridge on the platform 3, first slide roof beam with the coincidence of the length direction's of second slide roof beam central line.
S3, respectively assembling steel cross beams 4 on the first sliding support platforms 2 on the left sides of No. 23 and No. 24 pier columns, after the steel cross beams 4 are assembled, installing guide beams 5 at the end parts, facing the pier columns, of the steel cross beams 4, wherein the guide beams 5 are divided into two sections, namely variable sections and cross sections, and the length of the variable section connected with the steel cross beams 4 is 6.6 m;
then, the steel crossbeam 4 and the guide beam 5 synchronously fall on the first slideway beam, the steel crossbeam 4 is dragged by using a dragging system, the dragging stroke is 53m in total, 4m is tried to be dragged on the premise of ensuring that the guide beam 5 does not invade the safety range of Qingrong railways, the stability of dragging equipment and a control system is checked, meanwhile, the distance from the guide beam 5 to the right pier body can be shortened, and then the remaining stroke is dragged;
after the steel cross beam 4 is transversely moved to the steel cross beam along the first slide way beam and the second slide way beam to be in place, the front end of the steel cross beam 4 is jacked up by a jack, then the guide beam 5, the guide beam dismantling platform 3 and the second slide way beam are dismantled, a left pier top temporary support is installed, a right pier top TJQZ-bridge through 8361 spherical steel support is installed, the jack descends, the steel cross beam 4 is located on the support, and the jack is dismantled; finally, pouring concrete at the top support combining section of the left pier, wherein the left pier forms permanent consolidation, the right pier steel beam 4 is hinged with the support, the concrete is not poured temporarily, after the steel beam 4 completes other auxiliary construction, the concrete at the top support combining section of the right pier is poured, the right pier forms permanent consolidation, and the steel beam 4 and the No. 32 pier are fixedly constructed;
s4, erecting second sliding support platforms 7 at the first sliding support platforms 2 on the left sides of the No. 23 pier and the No. 24 pier;
the method for erecting the second sliding support platform 7 comprises the following steps: the first slideway beam is dismantled, the steel pipes are upwards connected, a top plate with the thickness of 20mm is arranged at the top of the steel pipe column after being connected, the steel pipes are connected in a flat and inclined mode by adopting steel pipes with the diameter of 426mm and the wall thickness of 10mm, and the supports are connected into a whole; arranging second double-spliced section steel with the specification of HN700 multiplied by 300mmH in the longitudinal bridge direction of the top of the steel pipe, and installing a second slideway beam at the upper end of the second double-spliced section steel, wherein the height of the second slideway beam is 2.0 m; a third slideway beam which is butted with the second slideway beam is arranged at the upper end of the steel crossbeam 4;
s5, using two second sliding support platforms 7 as supports, assembling steel trussed beams 8 at the upper ends of the two second sliding support platforms, after the steel trussed beams 8 are assembled, lapping the steel trussed beams 8 on the third slideway beam, dragging and transversely moving until the two ends of the steel trussed beams 8 are respectively positioned on the steel cross beams 4, and transversely moving the steel trussed beams 8 to be positioned; the total dragging stroke of the steel truss girder 8 is 46m, 18m is tried to be pulled on the premise of ensuring that the steel truss girder does not invade the safety range of a railway, the stability of dragging equipment and a control system is checked, the distance of a subsequent stroke can be shortened, and then the dragging of the residual stroke is carried out;
after the steel truss girder 8 is transversely moved to the steel crossbeam 4 to be in place, the steel truss girder 8 is jacked up by a jack, meanwhile, cushion blocks are stacked beside the jack, the cushion blocks are stacked by a plurality of base plates, two third slideway girders are removed, and the steel truss girder 8 falls into the girders for construction, specifically: the beam falling distance is uniformly reduced in a grading manner, the falling of a jack and the extraction of a base plate are alternately completed, then a support is installed on the steel cross beam 4, the support is fixed after the steel truss beam 8 is accurately positioned, and the beam falling installation of the steel truss beam 8 is completed;
and S6, removing the second sliding support platform 7.
The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention has been described above with reference to preferred embodiments, but the scope of protection of the invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the scope of protection of the invention. Various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict.
Claims (4)
1. A construction method for constructing a medium-large steel truss girder is characterized by sequentially carrying out the following steps:
s1, constructing at least two pairs of pier studs: the pier columns are formed by pouring concrete, and each pair of pier columns stretches across two sides of a bridge road;
s2, building a first sliding support platform (2) on an extension line at one end of each pair of pier stud connection lines, ensuring that the length direction of the first sliding support platform (2) is in the same direction with the connection lines of the pier studs in the pair during building, and ensuring that the first sliding support platform (2) is positioned on the same side of the longitudinal bridge direction;
the method for erecting the first sliding support platform (2) comprises the following steps: connecting a steel pipe to a drilled pile for construction, arranging first double-spliced steel on a steel pipe top in the longitudinal direction of a bridge, transversely erecting a first slideway beam on the first double-spliced steel in the bridge direction, and finishing erection of the first sliding support platform (2);
a guide beam dismantling platform (3) with the same height as the pier column is erected on the other side of each pair of pier columns, and second transverse bridge-direction slideway beams are installed on the tops of the pier columns and the guide beam dismantling platforms (3);
the central lines of the first slideway beam and the second slideway beam in the length direction are overlapped;
s3, assembling a steel beam (4) on the first sliding support platform (2), dragging the steel beam (4) to the pier column along the first sliding support platform (2) to be in place and installed, and completing construction of a frame pier structure formed by the pair of pier columns and the steel beam;
after the steel cross beam (4) is assembled, a guide beam (5) is installed at the end part, facing a pier seat, of the steel cross beam (4), then the steel cross beam (4) and the guide beam (5) synchronously fall on the first slideway beam, the steel cross beam (4) is pulled, so that the steel cross beam (4) is transversely moved to a pier column in place along the first slideway beam and the second slideway beam, the guide beam (5), the guide beam dismantling platform (3) and the second slideway beam are dismantled, and the steel cross beam (4) falls on the beam and is installed in place;
s4, building a steel truss girder sliding platform: second sliding support platforms (7) are erected at two adjacent first sliding support platforms (2), the two second sliding support platforms (7) jointly form a steel truss girder sliding platform, and the steel truss girder sliding platform is used for sliding the steel truss girder to a steel cross beam;
the method for erecting the second sliding support platform (7) comprises the following steps: the first sliding support platform (2) is upwards connected to be as high as the upper end face of the steel cross beam (4); the method specifically comprises the following steps: the first slideway beam is dismantled, the steel pipe is upwards heightened, second double-spliced section steel is arranged in the longitudinal bridge direction at the top of the heightened steel pipe, a third slideway beam is arranged at the upper ends of the second double-spliced section steel and the steel cross beam (4), and the installation direction of the third slideway beam is still the transverse bridge direction;
s5, assembling the steel truss girder (8) on the steel truss girder sliding platform, transversely moving the steel truss girder (8) along the steel truss girder sliding platform in place, and installing the steel truss girder along the steel truss girder sliding platform in place, wherein the specific method for transversely moving the steel truss girder along the steel truss girder sliding platform in place comprises the following steps: the steel trussed beams (8) are lapped on the two third slideway beams to be dragged and transversely moved until two ends of the steel trussed beams (8) fall on the steel cross beam (4), the steel trussed beams (8) transversely move in place, the steel trussed beams (8) are jacked, and after the third slideway beams are removed, the steel trussed beams (8) fall in place for installation;
s6, dismantling the steel truss girder sliding platform.
2. The construction method for constructing a medium and large steel truss girder according to claim 1, wherein in the step S3, after the steel beam (4) is moved to a pier stud along the first and second skid beams to a proper position, the steel beam (4) is lifted up by a jacking device, then the guide beam (5), the guide beam removing platform (3) and the second skid beam are removed, a support is installed on the two pier studs, the jacking device is lowered, the steel beam (4) is positioned on the support, and the jacking device is removed; and finally, pouring a connecting section of the pier top and the steel beam (4) to form permanent consolidation, and finishing the construction of the steel beam (4) and the pier stud.
3. The construction method for constructing the medium and large steel trussed beam according to claim 1, wherein in the step S5, after the steel trussed beam (8) is transversely moved to a proper position, the steel trussed beam (8) is horizontally lifted by a jacking device, meanwhile, a cushion block is stacked beside the jacking device, the cushion block is stacked by stacking a plurality of cushion plates, and after the third slideway beam is removed, the steel trussed beam (8) is constructed by dropping the beam, specifically: the beam falling distance uniformly descends in a grading mode, the falling of the jacking device and the drawing out of the base plate are alternately completed, then the support is installed on the steel beam (4), the support is fixed after the steel truss beam (8) is accurately in place, and the beam falling installation of the steel truss beam (8) is completed.
4. The construction method for constructing a medium or large steel truss according to claim 1, wherein in the step S2, the construction method for connecting the steel pipes to the bored piles comprises: the method comprises the steps of drilling on the ground, pouring concrete to form a cast-in-situ bored pile, building a pouring bearing platform at the upper end of the cast-in-situ bored pile, embedding a steel plate on the top of the bearing platform, connecting steel pipes with the embedded plate on the top of the bearing platform, welding stiffening plates on the periphery of the steel pipes, arranging a top plate on the top of the steel pipes, and connecting all the steel pipes into a whole through the top plate.
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