CN111254836A - Site assembling and bridge girder erection machine erecting construction method for large-span steel-concrete composite beam in mountainous area - Google Patents
Site assembling and bridge girder erection machine erecting construction method for large-span steel-concrete composite beam in mountainous area Download PDFInfo
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- CN111254836A CN111254836A CN202010100433.XA CN202010100433A CN111254836A CN 111254836 A CN111254836 A CN 111254836A CN 202010100433 A CN202010100433 A CN 202010100433A CN 111254836 A CN111254836 A CN 111254836A
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention discloses a construction method for field assembly and bridge girder erection by a bridge girder erection machine of a large-span steel-concrete composite beam in a mountainous area, which comprises the following steps: prefabricating a steel box girder; assembling the prefabricated steel box girder in sections; positioning and mounting a steel box girder top precast slab; and erecting the precast steel box girder. The steel-concrete composite beam field assembling and erecting construction technology can be applied to the construction of the steel-concrete beam of the highway under various conditions, and the prefabricated plates are assembled by the segmented industrial production of the steel-concrete beam and the transportation to the construction field, so that the construction progress is accelerated, the construction period is shortened, the respective technical advantages of a steel structure and a concrete structure are fully exerted, the self load of the structure can be reduced, the section size is reduced, the fatigue resistance and the earthquake resistance of the structure are enhanced, the structural stability is improved, and the like.
Description
Technical Field
The invention relates to the field of construction of highway engineering bridge steel-concrete composite beams, in particular to a construction method for on-site assembly and bridge girder erection by a bridge girder erection machine of a large-span steel-concrete composite beam in a mountainous area.
Background
In recent years, the steel-concrete composite beam has been more and more widely applied to urban overpasses in China as a new technology and a new process, and is developing towards the direction of large span.
Compare in the past, erect more adoption mode of directly erectting the steel box girder to the bridge erection, more adoption steel-concrete composite beam construction's among the prior art mode is under construction, this kind of mode of erectting has solved the problem that can lead to the bridge floor in steel box girder direct contact, nevertheless it is higher to the construction process requirement in traditional technology, when can not satisfy construction process condition, often can lead to structure self load higher because of construction technology's difference, and the cross sectional dimension is great, can reduce structure antifatigue ability and anti-seismic performance, the holistic structural stability of bridge is lower, the whole construction quality of steel-concrete composite beam and engineering progress are difficult to guarantee.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is how to give full play to the respective technical advantages of a steel structure and a concrete structure, reduce the self load of the structure, reduce the section size, enhance the anti-fatigue capability and the anti-seismic performance of the structure and improve the structural stability.
According to a first aspect, an embodiment of the present invention provides a construction method for field assembling and bridge erection of a large-span steel-concrete composite beam in a mountainous area, including: prefabricating a steel box girder; assembling the prefabricated steel box girder in sections; positioning and mounting a steel box girder top precast slab; and erecting the precast steel box girder.
Optionally, the prefabrication of the steel box girder comprises: carrying out preset splitting on each steel box girder, and carrying out segmented processing according to the preset splitting section number; and transporting the steel box girder sections to a construction site, and assembling and splicing the steel box girder sections on the construction site.
Optionally, assembling the prefabricated steel box girder in sections comprises: building a jig frame; segment assembling; screwing the high-strength bolt; welding a lifting lug; and (4) transferring.
Optionally, the positioning and mounting of the steel box girder top precast slab comprises: transferring the steel box girder; installing a precast concrete slab; binding steel bars; erecting a cast-in-place seam; pouring concrete; curing and consolidating the concrete; and (6) hoisting.
Optionally, erecting the steel box girder precast slab comprises: and (5) installing a bridge girder erection machine.
Optionally, the set mount bridge crane comprises: the adopted installation sequence is as follows: measuring and positioning; symmetrically assembling main trussed beams on two sides in a balanced manner; installing a front-back connection frame and a temporary support; installing front, middle and rear supporting legs and middle and rear jacking supporting legs; laying a longitudinal rail; installing a hoisting trolley, a hydraulic system, an operating platform and switching on a power supply; and checking and debugging to run preliminarily.
Optionally, the construction of the lifting beam, the transporting beam, the feeding beam and the dropping beam of the steel box girder structure comprises the following steps: and advancing the bridge girder erection machine.
Optionally, before the mounting frame bridge crane, the following are included: and accurately positioning the mounting position of the steel box girder in advance.
This application is prefabricated at first to the steel box girder, divide into every steel box girder a plurality of and predetermine the festival section and process in the steel box girder processing factory, later with prefabricated steel box girder segment assembling work, form unified whole, after fix a position installation steel box roof beam top prefabricated plate, start on-the-spot assembling and construction work, erect prefabricated steel box girder at last, accomplish construction work. The steel-concrete composite beam field assembling and erecting construction technology can be applied to the construction of the steel-concrete beam of the highway under various conditions, and the prefabricated plates are assembled by the segmented industrial production of the steel-concrete beam and the transportation to the construction field, so that the construction progress is accelerated, the construction period is shortened, the respective technical advantages of a steel structure and a concrete structure are fully exerted, the self load of the structure can be reduced, the section size is reduced, the fatigue resistance and the earthquake resistance of the structure are enhanced, the structural stability is improved, and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of a construction method for assembling a large-span steel-concrete composite beam in a mountainous area on site and erecting a bridge girder erection machine according to an embodiment of the invention;
FIG. 2 is a schematic assembly diagram illustrating a construction method for field assembly and bridge girder erection by a bridge girder erection machine in a mountain area according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing arrangement of precast slabs in a construction method for assembling a large-span steel-concrete composite beam in a mountainous area on site and erecting a bridge girder erection machine according to an embodiment of the invention;
fig. 4 shows an assembly schematic diagram of the field assembly and bridge girder erection construction method of the large-span steel-concrete composite beam in the mountainous area according to the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
As described in the background art, compared with the prior art, more bridges are erected by adopting a mode of directly erecting steel box girders, more steel-concrete composite girders in the prior art are constructed by adopting a mode of directly erecting steel box girders, the erection mode solves the problem of direct contact between the bridge deck and the steel box girders, but the traditional technology has higher requirements on the construction process, when the construction process conditions cannot be met, the self load of the structure is higher due to the difference of the construction technology, the section size is larger, the anti-fatigue capability and the anti-seismic performance of the structure can be reduced, the structural stability of the whole bridge is lower, and the whole construction quality and the engineering progress of the steel-concrete composite girders are difficult to guarantee.
Therefore, the inventor provides a novel construction method for assembling the large-span steel-concrete composite beam in the mountainous area and erecting a bridge girder erection machine, wherein the prefabricated steel box beam is assembled in sections on site, the prefabricated steel box beam top prefabricated plate is positioned and installed after the assembly is completed, and the steel box beam of the fish is finally erected. Specifically, referring to a flow diagram of a construction method for field assembling and bridge erection by a bridge girder erection machine in a mountain area with a large span of a steel-concrete composite beam shown in fig. 1, the method specifically includes the following steps:
s11, prefabricating the steel box girder. In this embodiment, each steel box girder is first preset split, segmented according to the number of preset split segments, and after segmented according to the number of preset split segments, the steel box girder segments are transported to a construction site and assembled and spliced at the construction site
Specifically, in order to guarantee integrity and splicing quality of the steel box girders and solve the problem of limitation of the prefabricating site of the steel box girders, each steel box girder is divided into a plurality of preset sections according to the site and construction conditions, the preset sections are processed in a processing factory according to a sectional processing mode, after the processing is finished, box section groups are transported to the site, the box section groups are transported to the site and are spliced and bolted to form a jig frame to be assembled, the assembling jig frame line type is consistent with the factory manufacturing line type, and each steel box girder is arranged on the jig frames of the preset number to be installed.
And S12, assembling the prefabricated steel box girder in sections. In this embodiment, when the steel box girder segments are assembled, sequential construction is performed according to the processes of segment assembly, high-strength bolt screwing, lug welding and transferring.
Specifically, as shown in fig. 2, after the splicing material is transported to the site, in a step a, a jig frame erection and segment splicing process is firstly performed, a temporary jig frame needs to be set up during the jig frame erection, the height of the jig frame is adjusted to match with a vertical curve of a steel beam, segment splicing work is performed, a box beam transported to the site is subjected to segment splicing on the jig frame, and each span is combined into a hoisting segment; b, performing a high-strength bolt screwing process, wherein the high-strength bolt screwing process comprises initial screwing and final screwing, and the high-strength bolt screwing process is performed according to preset torque; c, carrying out procedures of welding lifting lugs and transferring, positioning and welding the prefabricated lifting lugs, wherein the welding seams are at least full penetration level I, and at least meet the hoisting requirement; and finally, carrying out a transferring process, and transferring the prefabricated concrete area after the whole beam section is spliced.
And S13, positioning and installing the steel box girder top precast slab. In this embodiment, the construction process sequence of transferring the steel box girder, installing the precast concrete slab, bundling the steel bars, erecting the cast-in-place seam, pouring the concrete, curing and solidifying the concrete, and hoisting is performed.
Specifically, the arrangement diagram of the prefabricated panels is shown in fig. 3, and the arrangement of the prefabricated panels is performed according to the position diagram of fig. 3. After the steel box is spliced on the on-site splicing jig frame, the steel box can be transferred to the position of the concrete precast beam, the steel box is placed on the prefabricated concrete jig frame, the precast slab on the steel box beam is positioned and installed, the positioning and installation process is shown in fig. 4, firstly, the transfer process of the steel box beam is carried out in D, and the precast concrete area is transferred after the splicing of the integral beam end is completed; after the completion, the installation of the precast concrete slab in the step E and the steel bar bundling are carried out, after the integral box girder is transferred to a corresponding area, the assembly of the precast concrete bridge deck on the steel box girder is carried out, and meanwhile, the steel bar bundling procedure is carried out to bundle the exposed steel bars of the bridge deck; after the completion, carrying out the processes of supporting the membrane by the cast-in-place seam and pouring concrete in F, carrying out the quality inspection of the cast-in-place seam on the bridge deck, mounting the detachable inner and outer steel membranes, entering the process of pouring concrete, carrying out concrete pouring after the template is installed, firstly, beating shear nail parts on the box girder wing plates to cast the concrete in place, and then, casting the cast-in-place seam between the bridge decks; and finally, concrete curing, solidifying and hoisting are carried out in the step G, the concrete is maintained after being poured in the concrete curing and solidifying step, the concrete can be hoisted after the strength meets the preset requirement, and a bridge girder erection machine is adopted in the hoisting step to hoist the integral segments.
As an exemplary embodiment, erecting the steel box girder prefabricated panels includes: and (5) installing a bridge girder erection machine.
Specifically, according to the weight of the beam section and the span of the beam section, the bridge girder erection machine is selected on the premise of ensuring the safe operation of the bridge girder erection machine, the selection principle requirement accords with the safe first principle, the whole machine is light in weight, the cantilever is short, the assembling, disassembling and transition are convenient, and the erection construction is rapid. The bridge girder erection machine is a complete structural system formed by connecting a main girder, a lifting trolley, a front supporting leg, a middle supporting leg, a walking track, a hydraulic device, an electric device and the like by using a pin shaft and a flange.
As an exemplary embodiment, a group mount bridge girder erection machine comprises: measuring and positioning; symmetrically assembling main trussed beams on two sides in a balanced manner; installing a front-back connection frame and a temporary support; installing front, middle and rear supporting legs and middle and rear jacking supporting legs; laying a longitudinal rail; installing a hoisting trolley, a hydraulic system, an operating platform and switching on a power supply; and checking and debugging to run preliminarily.
Specifically, when the bridge girder erection machine is installed, the position of the installed bridge girder erection machine is firstly positioned and measured, a proper installation position is found, then main trusses on two sides are symmetrically assembled in a balanced mode, the frame is mainly formed by welding profile steel and located at the front ends of two main beams, and the two main beams are connected together through a pin shaft. The rear upper cross beam is arranged at the upper part of the rear ends of two rows of main beams and is formed by welding profile steel and steel plates, two ends of the rear upper cross beam are connected with the main beams through adjustable flanges and rotary supports, then a front connection frame, a rear connection frame and a temporary support are sequentially installed and installed according to the installation process flow of the bridge girder erection machine, a front support leg, a middle support leg, a rear support leg, a middle support leg and a rear support leg are installed, then a longitudinal rail is laid, a lifting trolley, a hydraulic system, an operation platform and a power supply are installed, after all installation is completed, the condition of debugging equipment is checked and the bridge girder erection machine is initially operated, namely, the bridge girder erection machine is in place before installation, firstly, the bridge girder erection machine moves forwards in an idle load way, two lifting trolleys move back to the vicinity of the rear support leg, the front support leg is folded in place, a transverse rail is laid on a cover beam, then a walking box falls on the rail, the rear transverse moving rail of the bridge girder erection machine is arranged on the pier at the first preset position, and the front transverse moving rail is arranged on the pier capping beam at the second preset position.
As an exemplary embodiment, erecting the prefabricated steel box girder includes: and (4) lifting, transporting, feeding and dropping the steel box girder structure.
Specifically, a beam lifting procedure is executed firstly, the front and rear gantry cranes, a gantry crane winch and a brake system are inspected firstly, whether the front and rear gantry cranes normally operate or not and whether the gantry crane winch normally operates or not and whether the brake system meets the requirements of safe lifting or not are detected respectively, then the bolting degree of a lifting appliance, a steel wire rope and a lifting ring locking program are checked, and after the front and rear gantry cranes are checked to be intact, the front and rear gantry cranes start to be uniformly balanced at a constant speed, and the beam can be lifted; then entering a beam transporting process, stably, solidly and obliquely parking the beam transporting vehicle in a beam yard, locking wheels, and closely matching the beam transporting vehicle with a gantry crane to transport the steel box beam; then, a beam feeding procedure is executed, when the beam plate is transported to the bridge girder erection machine, beam feeding operation is executed, whether the operation of the bridge girder erection machine is normal or not, whether sleepers are firmly padded or not and whether lifting appliances are safe or not are checked, the states of verticality of steel ropes and locking of lifting rings are kept, and the beam transportation is started when the speed of a crown block and the speed of a beam transporting vehicle are kept consistent; and finally, a girder falling process is carried out, the girder plates conveyed to the span are fallen, the front end and the rear end of the girder are basically kept consistent when the girder falls, the difference amplitude cannot be larger than a preset error value, after the side girder is erected and transversely moved to a designated position, the upper side of the pier is pulled to the upper end of the girder by a chain block, different hoisting crown blocks of the bridge girder erection machine are simultaneously loosened at a low speed, and meanwhile, the chain block is tightened by the assembly until the side girder falls to a correct position.
As an exemplary embodiment, the construction of the lifting beam, the transporting beam, the feeding beam and the falling beam of the steel box girder structure comprises the following steps: and (5) moving the bridge girder erection machine forwards.
Specifically, after the first span beam is erected, the bridge erecting machine is checked, after no fault is confirmed, the middle and rear jacking support legs are jacked up, the middle and rear walking boxes are changed from horizontal to longitudinal, the middle and rear jacking support legs fall down to enable the walking boxes to fall onto a longitudinal rail, the two lifting trolleys retreat to the positions near the rear support legs, the front support legs are folded, the extension rail is laid, the bridge erecting machine moves forwards to be in place, the next span beam is erected, and the lifting sequence is the same as that of the first span beam.
As an exemplary embodiment, before installing the bridge girder erection machine, the method comprises: and accurately positioning the mounting position of the steel box girder in advance.
Specifically, before hoisting, control points and lines are arranged on the permanent supporting points of the piers and the temporary buttresses, and the control points and lines are correspondingly arranged on the steel box girders.
This application is prefabricated at first to the steel box girder, divide into every steel box girder a plurality of and predetermine the festival section and process in the steel box girder processing factory, later with prefabricated steel box girder segment assembling work, form unified whole, after fix a position installation steel box roof beam top prefabricated plate, start on-the-spot assembling and construction work, erect prefabricated steel box girder at last, accomplish construction work. The steel-concrete composite beam field assembling and erecting construction technology can be applied to the construction of the steel-concrete beam of the highway under various conditions, and the prefabricated plates are assembled by the segmented industrial production of the steel-concrete beam and the transportation to the construction field, so that the construction progress is accelerated, the construction period is shortened, the respective technical advantages of a steel structure and a concrete structure are fully exerted, the self load of the structure can be reduced, the section size is reduced, the fatigue resistance and the earthquake resistance of the structure are enhanced, the structural stability is improved, and the like.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A construction method for field assembly and bridge erection of a large-span steel-concrete composite beam in a mountainous area is characterized by comprising the following steps:
prefabricating a steel box girder;
assembling the prefabricated steel box girder in sections;
positioning and mounting a steel box girder top precast slab;
and erecting the precast steel box girder.
2. The on-site assembling and bridge girder erection machine erection construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 1, wherein the prefabricating of the steel box girder comprises the following steps:
carrying out preset splitting on each steel box girder, and carrying out segmented processing according to the preset splitting section number;
and after the steel box girder segments are processed in sections according to the preset number of the split segments, the steel box girder segments are transported to a construction site and assembled and spliced on the construction site.
3. The field assembling and bridge girder erection machine erection construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 1, wherein the step of assembling the prefabricated steel box girder in sections comprises the following steps:
building a jig frame;
segment assembling;
screwing the high-strength bolt;
welding a lifting lug;
and (4) transferring.
4. The on-site assembling and bridge girder erection machine erection construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 1, wherein the positioning and mounting of the steel box girder top precast slab comprises the following steps:
assembling the steel-concrete composite beam;
and erecting the steel-concrete composite beam.
5. The on-site assembling and bridge girder erection machine erection construction method for the mountain area large-span steel-concrete composite beam according to claim 4, wherein the assembling of the steel-concrete composite beam comprises:
transferring the steel box girder;
installing a precast concrete slab;
binding steel bars;
erecting a cast-in-place seam;
pouring concrete;
curing and consolidating the concrete;
and (6) hoisting.
6. The on-site assembling and bridge girder erection construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 4, wherein the erection of the steel box girder precast slabs comprises the following steps:
and (5) installing a bridge girder erection machine.
7. The on-site assembling and bridge girder erection machine erecting construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 6, wherein the installing of the bridge girder erection machine comprises the following steps:
the adopted installation sequence is as follows: measuring and positioning; symmetrically assembling main trussed beams on two sides in a balanced manner; installing a front-back connection frame and a temporary support; installing front, middle and rear supporting legs and middle and rear jacking supporting legs; laying a longitudinal rail; installing a hoisting trolley, a hydraulic system, an operating platform and switching on a power supply; and checking and debugging to run preliminarily.
8. The on-site assembling and bridge girder erection machine construction method of the large-span steel-concrete composite beam in the mountainous area according to claim 1, wherein the erection of the prefabricated steel box girder comprises the following steps:
and (4) lifting, transporting, feeding and dropping the steel box girder structure.
9. The on-site assembling and bridge girder erection machine erection construction method of the large-span steel-concrete composite beam in the mountainous area according to claim 8, wherein after the construction of the lifting beam, the transporting beam, the feeding beam and the dropping beam of the steel box girder structure, the method comprises the following steps:
and advancing the bridge girder erection machine.
10. The on-site assembling and bridge girder erection machine construction method for the large-span steel-concrete composite beam in the mountainous area according to claim 5, wherein the installation position of the steel box girder is accurately positioned in advance before the steel-concrete composite beam is hoisted in place.
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| CN112144413A (en) * | 2020-09-28 | 2020-12-29 | 贵州大通路桥工程建设有限公司 | Whole-span in-situ splicing and erecting method for steel-concrete composite beam in mountainous area |
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| CN112695616A (en) * | 2021-02-04 | 2021-04-23 | 重庆交通大学 | Anti-seismic coupling structure for assembled steel-concrete composite beam |
| CN113737853A (en) * | 2021-09-09 | 2021-12-03 | 中铁二局集团有限公司 | Construction method of multi-stage stress body top cover in complex field environment |
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