CN111676816A - Steel truss girder and frame pier steel beam construction method - Google Patents

Steel truss girder and frame pier steel beam construction method Download PDF

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Publication number
CN111676816A
CN111676816A CN202010469075.XA CN202010469075A CN111676816A CN 111676816 A CN111676816 A CN 111676816A CN 202010469075 A CN202010469075 A CN 202010469075A CN 111676816 A CN111676816 A CN 111676816A
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CN
China
Prior art keywords
steel
pier
girder
platform
sliding support
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Pending
Application number
CN202010469075.XA
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Chinese (zh)
Inventor
陈有冲
史玉强
杨玉海
高立奖
张方敏
仇传佳
赵天刚
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Shandong Weilai High Speed Railway Co., Ltd
China Railway No 10 Engineering Group Co Ltd
Qingdao Engineering Co Ltd of China Railway No 10 Engineering Group Co Ltd
Original Assignee
Qingdao Engineering Co Ltd of China Railway No 10 Engineering Group Co Ltd
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Publication date
Application filed by Qingdao Engineering Co Ltd of China Railway No 10 Engineering Group Co Ltd filed Critical Qingdao Engineering Co Ltd of China Railway No 10 Engineering Group Co Ltd
Priority to CN202010469075.XA priority Critical patent/CN111676816A/en
Publication of CN111676816A publication Critical patent/CN111676816A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • E01D21/06Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D6/00Truss-type bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/30Metal

Abstract

A construction method for building steel trussed beams and frame pier steel cross beams relates to the technical field of bridge construction and comprises the following steps: s1, constructing a pair of pier studs; s2, building a first sliding support platform on an extension line at one end of a connecting line of two pier studs; 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 a second sliding support platform at the first sliding support platform, selecting a single pier adjacent to the pier stud, and erecting a third sliding support platform at the side edge of the single pier; 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

Steel truss girder and frame pier steel beam construction method
Technical Field
The invention relates to the technical field of bridge construction, in particular to a steel truss girder and a construction method for constructing a steel beam of a frame pier.
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 steel truss girder and a steel crossbeam of a frame pier, wherein a support is erected on the same side of the longitudinal direction of a bridge and a train business line, a dragging construction process is adopted for the steel crossbeam, and a method for remotely assembling, dragging, transversely moving and in-place constructing the steel truss girder by using the same support is adopted, so that the normal and safe operation of the conventional railway is ensured, and the construction for erecting the steel truss girder is finished with high quality and high efficiency.
The invention provides a construction method for constructing a steel truss girder and a frame pier steel beam, which sequentially comprises the following steps:
s1, constructing a pair of pier studs: respectively pouring and constructing a pier stud on two sides of the bridge road;
s2, building a first sliding support platform on the extension line of one end of the connection line of the two pier studs, wherein the length direction of the first sliding support platform is in the same direction as the connection line of the center lines of the two pier studs:
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:
a second sliding support platform is erected at the first sliding support platform, a single pier adjacent to the two piers is selected, a third sliding support platform with the height equivalent to that of the upper end face of the single pier is erected on the side edge of the single pier, the second sliding support platform and the third sliding support platform are parallel, the second sliding support platform and the third sliding support platform jointly form a steel truss girder sliding platform, and the steel truss girder sliding platform is used for sliding a steel truss girder onto the piers and the single piers;
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 columns on the other sides of the two pier columns, and installing second transverse bridge slideway beams on the tops of the pier columns and the guide beam dismantling platform;
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 the 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, and the steel beam is pulled, so that the steel beam is moved to a pier column and a single pier along the first slideway beam and the second slideway beam, and the guide beam, the guide beam dismantling platform and the second slideway beam are dismantled, and the steel beam is installed in place.
Preferably, in step S4, the method for setting up the second sliding support platform specifically includes: 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;
the method for erecting the third sliding support platform specifically comprises the following steps: and (3) connecting a steel pipe to the drilled pile for construction, and erecting third double-spliced section steel on the top longitudinal bridge of the steel pipe, and erecting a fourth slide way beam on the third double-spliced section steel in the transverse bridge direction, wherein the third sliding support platform is erected and completed.
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: the steel trussed beams are lapped on the third slideway beam and the fourth slideway beam to drag and transversely move until one ends of the steel trussed beams fall on the steel cross beam and the other ends of the steel trussed beams fall on a single pier, the steel trussed beams transversely move in place, the steel trussed beams are jacked up, and the steel trussed beams fall in place and are installed after the third slideway beam and the fourth slideway beam are dismantled;
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 stud along the first and second slideway beams, the steel beam is lifted by a jacking device, the guide beam dismantling platform and the second slideway beam are dismantled, supports are respectively installed on the steel beam and the single pier, 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 and the fourth slideway beam are removed, the steel truss falls into a beam for construction, specifically: the beam falling distance is uniformly reduced in a grading mode, 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 and the single pier, the support is fixed after the steel truss beam is accurately in place, and the steel truss beam falling is completed in place and installed.
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 two pier studs, the slide ways are 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 trussed beams are also assembled on the sliding support platform at a high position, the steel trussed beam sliding platform consisting of the frame piers and the single piers is used for directly transversely moving the drop beams in place, and the influence of the steel trussed beam 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 a third sliding support platform in step S4 in embodiment 2 of the present invention.
Fig. 7 is a construction state diagram of building the second sliding support platform in step S4 in embodiment 2 of the present invention.
Fig. 8 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. 9 is a second construction state diagram of the steel girder in the traverse moving state in step S5 in example 2 of the present invention.
Fig. 10 is a diagram of a state in which the steel truss girder is completely installed in place in step S5 in embodiment 2 of the present invention.
Fig. 11 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 embodiment 1 of the invention provides a construction method for constructing a steel truss girder and a frame pier steel beam, which sequentially comprises the following steps:
s1, constructing a pair of pier studs: respectively pouring and constructing a pier stud on two sides of the bridge road;
s2, building a first sliding support platform on an extension line at one end of a connecting line of the two pier studs, wherein the length direction of the first sliding support platform is in the same direction as the connecting line of the central lines of the two pier studs;
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;
the construction method for connecting the steel pipe to the drilled pile comprises the following steps: 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.
Erecting a guide beam dismantling platform which is as high as the pier columns on the other sides of the two pier columns, and installing second transverse bridge slideway beams on the tops of the pier columns and the guide beam dismantling platform;
the central lines of the first slideway beam and the second slideway beam in the length direction are overlapped.
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 slide way beam, dragging the steel cross beam so as to transversely move the steel cross beam to a pier column and a single pier in place along the first slide way beam and the second slide way 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 slide way beam, installing supports on the steel cross beam and the single pier respectively, descending the jacking device, positioning the steel cross beam on the supports, and dismantling the jacking device; 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.
S4, building a steel truss girder sliding platform:
a second sliding support platform is erected at the first sliding support platform, a single pier adjacent to the two pier studs is selected, a third sliding support platform with the height equivalent to that of the upper end face of the single pier is erected on the side edge of the single pier, the second sliding support platform and the third sliding support platform are parallel, and the second sliding support platform and the third sliding support platform jointly form a steel truss girder sliding platform;
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;
the method for erecting the third sliding support platform specifically comprises the following steps: connecting a steel pipe to a drilled pile for construction, arranging third double-spliced section steel on a steel pipe top longitudinal bridge in the longitudinal direction, erecting a fourth slideway beam on the third double-spliced section steel in the transverse direction, and finishing erection of a third sliding support platform;
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 truss girder is taken the third slide roof beam with the sideslip is dragged on the fourth slide roof beam, falls until steel truss girder one end the other end falls on the steel crossbeam on the single mound, and the steel truss girder sideslip is taken one's place, later, with jacking device will steel truss girder level top height stacks the cushion simultaneously on jacking device next door, and the cushion stacks by a plurality of backing plates and piles up to be listed as, demolishs behind third slide roof beam and the fourth slide roof beam, the construction of steel truss girder beam falling specifically is: 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 supports are installed on the steel beam and the single pier, the supports are fixed after the steel truss girder is accurately in place, and the steel truss girder falling is completed in place and installed;
s6, dismantling the steel truss girder sliding platform.
In addition, the role of the return line in the construction of railway tracks is: 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 two pier studs, the slide ways are 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 trussed beams are also assembled on the sliding support platform at a high position, the steel trussed beam sliding platform consisting of the frame piers and the single piers is used for directly transversely moving the drop beams in place, and the influence of the steel trussed beam 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 taken as an example of one pair, the sliding support platform is erected on the same side of the paired pier studs and the single pier, and the construction of the transverse movement of the steel beam and the transverse movement of the steel truss beam is explained in detail.
The embodiment 2 of the invention is that the Weilai right-line super bridge 31-33 piers of the Qingrong railway are constructed by arranging the steel trusses 8 of 1- (120+82) m, wherein the pier 32 is a steel beam 4+ reinforced concrete upright post frame pier, the height of the pier body is 12.2m, the pier top is provided with the steel beam 4, the (120+82) m continuous steel trusses 8 are provided with initial mile Qingrong right DK97+ 668.6-Qingrong right DK97+872.63, the steel trusses 8 and the Qingrong railway form an oblique angle of about 8.5 degrees, the steel trusses 8 are bottom bearing type steel trusses 8, the main trusses are triangular trusses with vertical rod integral nodes, the variable trusses are high, the trusses are 13-25m in height, the internode length is 9-13m, and the center distance of the main trusses is 10.0 m. The steel beam 4 calculated span is 29.5m, and the pier top supporting seat is set as follows: a temporary support is arranged at the top of the pier on the left side, after the steel cross beam 4 is pulled to be in place, concrete at the joint section of the steel cross beam 4 and the pier body wraps the temporary support to form consolidation constraint, and the TJQZ-bridge through 8361 spherical steel support is adopted at the top of the pier on the right side.
A sliding support platform is built on one side far away from an existing Qingrong railway (the dotted line in the attached drawing is marked as 10), and the construction method for building the steel truss girder 8 and the frame pier steel beam 4 specifically comprises the following steps:
s1: construction of pier stud No. 31-33, wherein No. 31 and No. 33 are single piers, No. 32 is paired pier studs, and reference numerals in the drawings are as follows: piers No. 1-32 and piers No. 6-31.
S2: a first sliding support platform 2 with the same height as the pier top is erected on the left side of the pier top of No. 32,
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 pier body at the left side of the No. 32 pier, then arranging 1 row of supports every 6 meters, 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;
after the first sliding support platform 2 is erected and completed, the platform 3 is dismantled on the right side of the 32 th pier stud with the guide beam with the same height as the pier stud, the guide beam is dismantled and the platform 3 is erected by adopting steel pipe supports, the steel pipe supports are arranged in two rows, the distance is 7.0m, the distance between the first row of support steel pipes and the right pier body is 5.3m, a top plate with the thickness of 10mm is arranged on the top of the steel pipe, 40H-shaped steel is transversely arranged on the top plate, 20U-shaped steel in double splicing mode is longitudinally arranged on the top of the H-shaped steel, the distance between the U-shaped steel is 2.0m, and finally, the second transverse bridge-mounted slideway beam is arranged on the platform 3 on the 32 th pier stud top and the guide beam dismantling device, and the central line of.
S3, assembling a steel cross beam 4 on the first sliding support platform 2, after the steel cross beam 4 is assembled, installing a guide beam 5 at the end part, facing to No. 32 pier seat, of the steel cross beam 4, wherein the guide beam 5 is divided into two sections of variable cross section and cross section, and the length of the variable cross section connected with the steel cross beam 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 a pier stud 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 a second sliding support platform 7 at the first sliding support platform 2 on the left side of the pier No. 32, and selecting to erect a third sliding support platform 10 on the left side of the pier No. 31;
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;
the method for erecting the third sliding support platform 10 comprises the following steps: connecting a steel pipe to a drilled pile for construction, arranging third double-spliced section steel on a steel pipe top longitudinal bridge in the longitudinal direction, erecting a fourth slideway beam on the third double-spliced section steel in the transverse direction, and finishing erection of a third sliding support platform 10;
s5, a second sliding support platform 7 and a third sliding support platform 10 are used as supports, a steel truss girder 8 is assembled at the upper ends of the second sliding support platform and the third sliding support platform, after the steel truss girder 8 is assembled, the steel truss girder 8 is lapped on the third slideway girder and the fourth slideway girder to be dragged and transversely moved until one end of the steel truss girder 8 falls on the steel crossbeam 4, the other end of the steel truss girder 8 falls on a pier No. 31, and the steel truss girder 8 transversely moves to a proper position; 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 cross beam 4 to be in place, the steel truss girder 8 is jacked up by a jack, meanwhile, cushion blocks are stacked beside the jack and stacked by a plurality of cushion plates, and after the third slideway beam and the fourth slideway beam are removed, the steel truss girder 8 falls down to be constructed, which specifically comprises the following steps: 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 and the third sliding support platform 10.
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 (8)

1. A construction method for building steel trussed beams and frame pier steel cross beams is characterized by sequentially carrying out the following steps:
s1, constructing a pair of pier studs: respectively pouring and constructing a pier stud on two sides of the bridge road;
s2, building a first sliding support platform on an extension line at one end of a connecting line of the two pier studs, wherein the length direction of the first sliding support platform (2) is in the same direction as the connecting line of the central lines of the two pier studs;
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;
s4, building a steel truss girder sliding platform: a second sliding support platform (7) is erected at the first sliding support platform (2), a single pier adjacent to two piers is selected, a third sliding support platform (10) with the height equivalent to that of the upper end face of the single pier is erected on the side edge of the single pier, the second sliding support platform (7) is parallel to the third sliding support platform (10), the second sliding support platform (7) and the third sliding support platform (10) jointly form a steel truss girder sliding platform, and the steel truss girder sliding platform is used for sliding a steel truss girder onto the piers and the single piers;
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);
s5, assembling the steel truss girder (8) on the steel truss girder sliding platform, and transversely moving the steel truss girder (8) along the steel truss girder sliding platform to be installed in place;
s6, dismantling the steel truss girder sliding platform.
2. The method for constructing a steel truss girder and a steel beam for frame pier according to claim 1, wherein in the step S2, the method for constructing the first sliding support platform (2) comprises: 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 columns is erected on the other sides of the two pier columns, and second transverse bridge-direction slideway beams are installed on the tops of the pier columns and the guide beam dismantling platform (3);
the central lines of the first slideway beam and the second slideway beam in the length direction are overlapped.
3. The steel truss girder and frame pier steel beam construction method as claimed in claim 2, wherein in the step S3, after the steel beam (4) is assembled, a guide girder (5) is installed at the end of the steel beam (4) facing the pier base, and then the steel beam (4) and the guide girder (5) are synchronously dropped on the first runner beam, the steel beam (4) is pulled, so that the steel beam (4) is transversely moved to a pier stud and a single pier along the first runner beam and the second runner beam, the guide girder (5), the guide girder removing platform (3) and the second runner beam are removed, and the steel beam (4) is dropped on the beam.
4. The method for constructing a steel truss girder and a steel beam of a frame pier according to claim 3, wherein in the step S4, the method for constructing the second sliding support platform (7) comprises: 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;
the method for erecting the third sliding support platform (10) specifically comprises the following steps: and (3) connecting a steel pipe to the drilled pile for construction, and erecting third double-spliced section steel on a steel pipe top longitudinal bridge, and erecting a fourth slide way beam on the third double-spliced section steel in a transverse bridge manner, wherein the third sliding support platform (10) is erected and completed.
5. The construction method for building the steel trussed beam and the steel beam of the frame pier according to claim 4, wherein in the step S5, after the steel trussed beam (8) is assembled, the concrete method for transversely moving the steel trussed beam to be installed in position along the steel trussed beam sliding platform is as follows: and the steel truss girder (8) is lapped on the third slideway girder and the fourth slideway girder to drag and move transversely until one end of the steel truss girder (8) falls on the steel beam (4) and the other end falls on a single pier, the steel truss girder (8) moves transversely to be in place, the steel truss girder (8) is jacked, and after the third slideway girder and the fourth slideway girder are dismantled, the steel truss girder (8) falls to be in place for installation.
6. The steel truss girder and frame pier steel girder construction method as claimed in claim 3 or 5, wherein in the step S3, after the steel girder (4) is moved to the pier stud along the first and second skid girders and is in place, the steel girder (4) is lifted up by a jacking device, then the guide girder (5), the guide girder removing platform (3) and the second skid girder are removed, and the steel girder and the single pier are respectively provided with a support, the jacking device is lowered, the steel girder (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.
7. The method for constructing a steel truss girder and a steel beam of a frame pier according to claim 5, wherein in the step S5, after the steel truss girder (8) is transversely moved to a proper position, the steel truss girder (8) is horizontally lifted by a jacking device, meanwhile, a cushion block is stacked beside the jacking device, the cushion block is stacked by a plurality of cushion plate stacks, after the third slideway beam and the fourth slideway beam are removed, the steel truss girder (8) is dropped, and the dropping process is 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 steel beam (4) and the single pier are provided with the support, 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.
8. The method for constructing a steel truss girder and a steel beam for a frame pier according to claim 2 or 5, wherein the method for constructing the bored pile by connecting the steel pipe to the bored pile in step S2 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.
CN202010469075.XA 2020-05-28 2020-05-28 Steel truss girder and frame pier steel beam construction method Pending CN111676816A (en)

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