CN113005908B - Installation method of overline overbridge - Google Patents
Installation method of overline overbridge Download PDFInfo
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- CN113005908B CN113005908B CN202110197186.4A CN202110197186A CN113005908B CN 113005908 B CN113005908 B CN 113005908B CN 202110197186 A CN202110197186 A CN 202110197186A CN 113005908 B CN113005908 B CN 113005908B
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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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- 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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to a method for installing a overline overbridge. The main span structure type of the overline overbridge is a steel-concrete combined beam, and the installation method comprises the following steps: 1) constructing a beam storage site; 2) constructing a supporting system; 3) processing the steel box girder and assembling the steel box girder and the girder storage field; 4) constructing a bridge deck system of the steel-concrete composite beam; 5) assembling and debugging the hydraulic module vehicle; 6) transporting and erecting the beam body; 7) expansion joint installation and bridge floor continuous construction. The installation method can realize the safe, quick and convenient installation of the overline overbridge with the main span structure type of the steel-concrete composite beam.
Description
Technical Field
The invention relates to a method for installing a bridge, in particular to a method for installing a main span overline overbridge with a steel-concrete composite beam.
Background
With the development of social economy, the service level of part of the expressway is obviously lagged behind the current economic development, in order to improve the traffic capacity and better serve the economic development of the surrounding areas, the part of the expressway needs to be rebuilt, and in the process of rebuilding and expanding construction of the expressway, the condition that the overpass needs to be dismantled and rebuilt to meet the requirement of rebuilding and expanding is often met.
However, at present, there is no safe, fast and convenient installation method for the overline overbridge with the main span structure type of the steel-concrete composite beam.
Disclosure of Invention
In view of the above, the present invention has been made to provide a method of installing a flying bridge that overcomes or at least partially solves the above problems.
A method for installing a overline overbridge, wherein the main span structure of the overline overbridge is a steel-concrete composite beam, and the method comprises the following steps:
1) construction of beam storage site
An enlarged foundation is arranged in the beam storage site, and the top surface of the enlarged foundation is flush with the site hardening layer;
2) construction of support system
The supporting system consists of a beam carrying support and steel pipe supporting legs arranged below the beam carrying support, and all components of the supporting system are processed in a factory and then transported to a beam storage site for assembly;
3) steel box girder processing and beam storage field inner assembly
Processing steel box girders in a factory in sections, performing trial assembly, transporting to a girder storage site, and assembling on a support system;
4) steel-concrete composite beam bridge deck system construction
Performing bridge deck construction, crash barrier construction and bridge deck pavement construction on the assembled steel box girder;
5) hydraulic module vehicle assembling and debugging
After the hydraulic module vehicle is transported to a beam storage site, assembling is carried out; after the assembly is finished, carrying out no-load simulation test on a beam storage site to verify the synchronism and the control performance;
6) transporting and erecting of beam body
After the hydraulic module cars are assembled and debugged in a beam storage yard, the hydraulic module cars are driven to the positions below the roof distribution beams of the beam bottom carrier support one by one in a preset height posture, the hydraulic module cars are synchronously lifted to lift the beam bodies until the roof distribution beams are separated from the steel pipe supporting legs, the weight of the steel-concrete combined beam and the carrier support is completely borne by the hydraulic module cars, and then the steel pipe supporting legs are dismantled;
the hydraulic module vehicle moves and transports the steel-concrete combined beam to a newly-built bridge site position according to a moving path;
after the hydraulic module vehicle is moved to accurately position the steel-concrete combined beam, the hydraulic module vehicle synchronously reduces the height until the beam body is contacted with the basin-type support; then the hydraulic module vehicle unloads the load in a grading way until the beam-carrying bracket is separated from the beam body, and the beam falling is finished;
7) expansion joint installation and bridge floor continuous construction.
Optionally, the beam-carrying support is composed of steel tube columns, a connecting rod for connecting adjacent steel tube columns, a roof distribution beam fixed at the lower ends of the steel tube columns, a top layer distribution beam fixed at the upper ends of the steel tube columns, and height-adjusting cushion blocks arranged on the top layer distribution beam.
Optionally, the bridge deck construction comprises the following steps:
A. arranging a top plate supporting system in the box;
B. arranging a flange plate supporting system;
C. erecting a bridge deck formwork; the bridge deck slab template is formed by splicing thick bamboo rubber plates and wood beams above a roof supporting system in the box and above a flange plate supporting system;
D. prepressing a support system; after the roof supporting system, the flange plate supporting system and the bridge deck slab are erected, sand bag preloading is adopted, and the load is 1.1 times of the pressure-bearing load required by the roof supporting system and the flange plate supporting system in the box;
E. constructing a bridge deck steel bar;
F. constructing bridge deck concrete; reserving expansion joint reserved grooves at two ends during pouring of the bridge deck slab, and embedding expansion joint fixing reinforcing steel bars;
G. removing the template and the supporting system; the removal of the bridge deck formwork, the roof supporting system in the box and the flange plate supporting system is carried out according to the principle sequence of removing after supporting and removing after supporting.
Optionally, the crash barrier construction comprises the following steps:
A. constructing crash barrier steel bars;
B. installing an anti-collision guardrail template; before the templates are installed, the bridge deck is leveled by mortar, the crash barrier templates are formed by splicing shaped steel plates, the templates are fastened by screws, plastic adhesive tapes are adhered to joints of the templates, and the joints of the templates and the paving layer are filled with joints by sponge materials;
C. constructing concrete of the anti-collision guardrail;
D. dismantling the anti-collision guardrail template;
E. and (5) maintaining the anti-collision guardrail.
Optionally, the bridge deck pavement construction comprises the following steps:
A. chiseling floating slag and cleaning the bridge floor;
B. coating a waterproof layer;
C. binding steel bars;
D. the drain pipe is embedded;
E. and (5) concrete construction.
Optionally, the beam transportation and erection further comprises: the method comprises the following steps of 1, chiseling the surface of a supporting cushion stone at the in-place part of a basin-type support, pouring high-strength mortar, leveling and adjusting to a designed elevation; and the pot type support is accurately positioned and installed, and the support bottom plate is fixed through planting bolts.
Optionally, the single-span steel-concrete combined beam adopts a fixed basin type support, three one-way movable basin type supports and four two-way movable basin type supports; each basin type support is arranged in parallel with the pier table.
Optionally, the expansion joint installation comprises: chiseling the bridge deck, and cleaning surface laitance to expose solid aggregate; leveling the expansion joint to enable the top surface of the expansion joint to be flush with the road surfaces on the two sides, welding and fixing main ribs of the expansion joint and reserved fixed reinforcing steel bars, then installing reinforcing steel bar meshes on the two sides, filling a foam plate in the middle of the expansion joint and filling the gap, then pouring steel fiber concrete, wetting a base surface before pouring, vibrating the concrete by adopting a vibrating rod in the pouring process, leveling, plastering and drawing the concrete surface layer by utilizing a ruler, and finally covering, sprinkling and curing by geotextile.
The installation method can realize the safe, quick and convenient installation of the overline overbridge with the main span structure type of the steel-concrete composite beam.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a cross-sectional view of a steel-concrete composite beam in a overpass in an exemplary embodiment of the invention;
FIG. 2 is a floor plan view of an assembly field;
FIG. 3A is a schematic structural view of a support system;
FIG. 3B is a schematic view of the support system from another perspective;
FIG. 4 is a layout diagram of a support system in a storage yard;
FIG. 5 is a deck system construction diagram;
FIG. 6 is a vertical layout of the roof support system in the enclosure;
FIG. 7 is a vertical layout of the flange plate support system;
FIG. 8 is a cross-sectional view of a cast-in-place support system for a decking;
fig. 9 is a hydraulic module car layout.
FIG. 10 is a layout view of a support of a single span steel-concrete composite girder
Description of reference numerals: 1. steel pipe supporting legs; 2. a steel pipe upright post; 3. a tie bar; 4. a roof distribution beam; 5. a top distribution beam; 6. a height adjusting cushion block; 7. hydraulic module car.
Detailed Description
The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Now, a method for installing a flying bridge according to the present invention will be described in detail by taking an example of a method for installing a flying bridge in which a main flying structure is a steel-concrete composite beam. The span of the overline overpass is arranged into 2 x 40 (steel-concrete composite beam), the left and right frames are divided, and the related technical standard of the main bridge is as follows:
(1) road grade: 4 lane overpass;
(2) bridge design load: highway-level I;
(3) arranging span: 2 x 40m (steel-concrete composite beam);
(4) bridge width: 23 m;
(5) bridge floor cross slope: 2 percent;
(6) oblique crossing angle: at 90 deg..
The installation method of the overline overbridge comprises the following steps:
1) construction of beam storage site
And selecting a proper position as a beam storage site through field investigation. The steel-concrete combined beam of the overline overpass is 40+40m in double width, the beam storage site can be 92m in length and 40m in width and is arranged by a highway, an enlarged foundation is arranged in the beam storage site, and the top surface of the enlarged foundation is flush with a site hardened layer. The beam yard can be set aside with a material yard with a length of 40m and a width of 12m, and the plane layout is shown in figure 2.
The construction process of the beam storage field comprises the following steps: leveling the field → compacting the ground surface → excavating the foundation pit → binding the reinforcing steel bars → pouring the concrete → watering and maintaining.
2) Construction of support system
The supporting system consists of a beam carrying support and steel pipe supporting legs arranged below the beam carrying support, wherein the beam carrying support consists of steel pipe vertical columns, connecting rods connected with adjacent steel pipe vertical columns, roof distribution beams fixed at the lower ends of the steel pipe vertical columns, top layer distribution beams fixed at the upper ends of the steel pipe vertical columns and height-adjusting cushion blocks arranged on the top layer distribution beams. The support system structure is shown in fig. 3A and 3B. After being processed in a factory, all components of the supporting system are transported to a beam storage place for assembly, and the arrangement of the supporting system in the beam storage place is shown in figure 4.
3) Steel box girder processing and beam storage field inner assembly
The steel box girder is processed in a factory in sections, is assembled in a trial mode, is transported to a girder storage site, and is assembled and assembled on a supporting system.
4) Steel-concrete composite beam bridge deck system construction
And constructing a bridge deck slab, an anti-collision guardrail and bridge deck pavement on the assembled steel box girder. Specifically, the bridge deck system consists of a 20-38 cm C50 cast-in-place reinforced concrete bridge deck, a 10cm C40 waterproof concrete bridge deck pavement and an SS-grade anti-collision guardrail (C30 concrete). The overline overbridge is a double-width bridge, and the single-width bridge deck is a unidirectional cross slope 2 percent.
The construction of the bridge deck system is high-altitude operation, and 1 vertical ladder stand is required to be arranged beside each bridge span to serve as a construction channel.
4.1) bridge deck construction
A. And arranging a top plate supporting system in the box. The steel box girder bottom plate is used as a supporting point for concrete pouring of the bridge deck slab in the box, full steel pipe scaffolds are erected, the distance between a transverse bridge and a vertical rod ranges from 39 cm to 40cm, the distance between a longitudinal bridge and the vertical rod ranges from 1.5m, and a formwork strip with the thickness of 8cm is arranged below the vertical rod. A row of longitudinal and transverse connecting scaffold steel pipes are respectively arranged at intervals of 1.5m in the height direction, so that all the upright posts are connected into a whole. The steel pipe support in the box should avoid the rib plate and the diaphragm plate. The in-box roof support system is arranged in elevation as shown in figure 6.
B. A flange plate support system is arranged. And (3) concrete pouring of the bridge deck slab outside the box takes the ground as a supporting point, full steel pipe scaffolds are erected, the distance between the transverse vertical rods is 20-40 cm, and the distance between the longitudinal vertical rods is 1.2 m. A row of longitudinal and transverse connecting scaffold steel pipes are arranged at intervals of 1.5m in the height direction, so that all the upright posts are connected into a whole. The outer support of the box should avoid the beam-carrying support. The flange plate support system is arranged in elevation as shown in figure 7.
C. And (5) erecting a bridge deck formwork. The bridge deck slab template is formed by splicing 15mm thick bamboo plywood and 8cm wood balk above a roof supporting system in the box and above a flange plate supporting system, and 3 wood balks are arranged in each cubic meter range in the transverse direction and the longitudinal direction. The cross section of the bridge deck cast-in-place support system is arranged as shown in figure 8.
D. And prepressing the support system. After the roof supporting system, the flange plate supporting system and the bridge deck slab are erected, sand bag preloading is adopted, and the load is considered according to 1.1 times of the bearing load required by the roof supporting system and the flange plate supporting system in the box, so that the uneven settlement of the foundation of the supporting system and the inelastic deformation of the supporting system are eliminated.
The pre-pressing loading of the supporting system can be carried out in 3 grades, and the sequentially applied loads are 60%, 80% and 100% of the value of the pre-pressing load in the unit. After each stage of loading is finished, monitoring the settlement of the support system at intervals of 12 hours; when the average value of the settlement difference of the measuring points of the support system for 2 times is less than 2mm, the support system can be continuously loaded.
E. And (5) constructing the reinforcing steel bars of the bridge deck. During steel bar binding, the size, the type, the quantity, the specification, the grade, the spacing and the lap joint length of the steel bar framework, the arrangement of the joint positions of the steel bars and the like all need to meet the design and specification requirements. When the beam body reinforcing steel bars collide with the shear nails, the common beam body reinforcing steel bars are properly moved or are properly bent, and the extension of the reinforcing steel bars is in accordance with the requirements of drawings. The beam reinforcing steel bar protection layer is controlled by quincunx cushion blocks, and the number of the cushion blocks is not less than 4 per square meter. The steel bar is lengthened by adopting a welding joint, and the lapping length of double-side welding is not less than 5 d. And pre-burying anti-collision guardrail No. 5 steel bars and bridge deck pavement shear steel bars during the binding of the bridge deck steel bars.
F. And (5) constructing concrete on the bridge deck. The concrete mixing proportion of the bridge deck plate meets the design and specification requirements through strict trial assembly. The bridge deck concrete is cast once, 1 pump truck can be adopted, casting is carried out from midspan to two ends, the transverse direction is from low to high, casting is gradually pushed by adopting a stubble pressing and slurry driving method, and horizontal layering is kept.
The concrete is vibrated by an inserted vibrator. The vibrating rod is vertically inserted into the concrete, the rod is lifted while vibrating, the rod is quickly inserted and slowly pulled, and the vibrating rod is preferably vibrated until the concrete does not sink and bubbles do not appear.
After the concrete is compacted and smoothed, roughening treatment is carried out before the concrete is initially set.
When the bridge deck slab is poured, expansion joint reserved grooves with the width of 32cm and the thickness of 11cm are reserved at two ends, expansion joint fixing reinforcing steel bars are embedded, and the transverse bridge spacing of the embedded reinforcing steel bars is 150 mm.
Concrete curing needs to strengthen the humidity and temperature control of concrete, reduce the exposure time of surface concrete as much as possible, and tightly cover the exposed surface of concrete in time (covering can be performed by using tarpaulin, plastic cloth and the like) to prevent the evaporation of surface water. The concrete covering and watering curing time is not less than 7 days.
G. And (5) removing the template and the support system. The removal of the bridge deck formwork, the roof support system in the box and the flange plate support system is carried out according to the principle of removing the formwork firstly after the support and removing the formwork firstly after the support. The templates above the roof support system in the box do not need to be removed, and the templates above the flange plate support system are sequentially unloaded from the cantilever end. When the template and the supporting system are dismantled, the concrete structure must not be damaged.
The side mold has the advantages that the compression strength of concrete of the side mold reaches 2.5MPa, the surface and edges of the concrete can be guaranteed not to be damaged due to mold removal, and the side mold can be removed after being poured for 1 day according to the concrete.
The supporting system of the top plate in the box has the compressive strength of 75 percent and can be detached when bearing the dead load, the bridge deck pavement dead load and other possible superposed loads, and the supporting system can be detached after being poured for 14 days according to concrete.
The template above the flange plate supporting system and the flange plate supporting system can be detached when the compressive strength of concrete reaches 100 percent and can bear the dead weight load, the dead weight load of the anti-collision guardrail and other possible superposed loads, and can be detached after 28 days of concrete pouring.
4.2) construction of anti-collision guardrail
A. And (5) constructing the anti-collision guardrail steel bars. And the framework steel bars of the anti-collision guardrail are connected with the embedded steel bars of the beam panel in a spot welding manner. The part with inaccurate position control of the embedded steel bars needs to be adjusted and corrected first, and the part which cannot be adjusted needs to be reinforced by planting the steel bars first.
B. And (5) installing an anti-collision guardrail template. And before the template is installed, mortar is used for leveling the bridge floor so as to conveniently install the template and control elevation. The anti-collision guardrail template is formed by splicing shaped steel plates, screws are used for fastening the templates, plastic adhesive tapes are used for adhering to joints of the templates, and sponge materials are used for filling joints between the templates and the paved layer, so that tight joints are ensured, no slurry leakage and no pollution are caused. When the template is installed, the phenomenon of slab staggering is strictly controlled.
C. And (5) performing concrete construction on the anti-collision guardrail. The concrete in-mold slump of the anti-collision guardrail is controlled to be 120-160 mm, the concrete pouring adopts a method of subsection layering inclined pouring, the first layer is controlled to be about 25cm, the second layer is poured to be about 35cm away from the guardrail top, then the second layer is poured to the guardrail top, and pouring construction can be carried out in a mode of hoisting a hopper by utilizing a truck crane.
During pouring, the vibrating rod needs to be inserted quickly and pulled slowly to promote bubbles to be discharged fully. The vibrating rod is inserted into the vibrated lower layer concrete for 5cm, so that the layered joint is eliminated. The insertion points are uniformly arranged and sequentially carried out, and the vibration time is well controlled, generally about 25 seconds is needed for each insertion point, and the concrete surface is flat and has no bubble. And excessive vibration is strictly prohibited, and the appearance is prevented from being influenced by the appearance of the concrete surface due to the phenomena of fish scale lines or quicksand and bleeding. In addition, the template collision is strictly forbidden during vibration so as to avoid the damage of the template and influence on the appearance quality.
And the mortar leveling layer at the bottom of the anti-collision guardrail template is prevented from intruding into the guardrail concrete strictly, and the guardrail is removed after the construction is finished.
D. And (5) dismantling the anti-collision guardrail template. Demolish the template after crashproof guardrail concrete strength reaches 2.5Mpa, demolish the template and avoid destroying concrete face and edges and corners.
And (3) cutting a false seam immediately after the template is removed, wherein one false seam can be arranged every 3-5 m, the width of the false seam is 3mm, and the depth of the false seam is 20 mm.
E. And (5) maintaining the anti-collision guardrail. The clean non-woven geotextile can be adopted for covering and watering for health preservation, and the health preservation time is not less than 7 days.
4.3) bridge deck pavement construction
The bridge deck pavement can adopt C40 waterproof concrete and HRB400 phi 12 steel bar net sheets.
The bridge deck pavement construction comprises the following steps:
A. chiseling floating slag and cleaning the bridge floor. Before pouring bridge deck pavement concrete, floating skin and oil stains on a joint surface need to be removed, and water is used for washing.
B. And (4) coating a waterproof layer. 1.4-1.7 kg/m of waterproof coating 2 Uniformly applied on the treated bonding surface by a roller brush。
C. And (5) binding steel bars. Determining the outline of the steel bar according to the requirement of a design drawing, popping up an ink line, and conveying the processed steel bar to a field for binding and welding.
D. The drain pipe is buried. And arranging a water drain pipe every 4-5 m along the longitudinal bridge, and arranging a gravel blind ditch with the width of 15cm and the thickness of 6cm between the water drain pipes. The vertical water drain pipe is connected with a longitudinal water receiving pipe through a tee joint, and the longitudinal water receiving pipe is connected with a drainage grounding pipe at the pier. The longitudinal water receiving pipe is fixed below the flange plate by a hanging bracket.
E. And (5) concrete construction. The expansion joint is provided with square timber for isolation, the concrete form-entering slump is controlled to be 120-160 mm, and the pouring construction can be carried out by utilizing a mode of hoisting a hopper by a truck crane. The concrete is spread and leveled by adopting 2 phi 50 vibrating rods, and the time for once inserting and vibrating the vibrating rods is not less than 20s, so that the aggregate is uniformly distributed.
After the concrete surface is touched by fingers and is not sticky, a vaporific sprinkler is adopted for sprinkling water, and after geotextile is fully paved, the concrete surface is covered for curing. And (5) watering and maintaining for 7 days to ensure the strength of concrete, performing joint cutting construction in time and avoiding cracks.
5) Hydraulic module vehicle assembling and debugging
The length of the steel-concrete combined beam is 40m, the weight is 688t, the total weight of the hydraulic module vehicle and the beam body is 940t, a 32-axis hydraulic module vehicle (8 4-axis hydraulic module vehicles) is adopted for carrying, and the hydraulic module vehicle and the beam are arranged in parallel. The total rated load 1280t of the 32-axis hydraulic module vehicle is more than 940 t. The hydraulic module car layout is shown in figure 9.
And after the hydraulic module vehicle is transported to a beam storage site, assembling is carried out. And (4) carrying out no-load simulation test on a beam storage field after assembly is completed so as to verify the synchronism and the control performance of the beam storage field.
6) Transporting and erecting of beam body
6.1) lifting up the beam body
After the hydraulic module cars are assembled and debugged in a beam storage yard, the hydraulic module cars are driven to the lower part of a roof distribution beam at the bottom of a beam one by one in a preset height posture, such as the height of 1.25m, the hydraulic module cars are synchronously lifted, a beam body is jacked until the roof distribution beam is separated from a steel pipe supporting leg by 10cm, the weight of a steel-concrete combined beam and a beam-carrying support is completely borne by the hydraulic module cars, the system conversion is completed, and then the steel pipe supporting leg is dismantled.
Jacking is carried out in a grading jacking mode, each grade of jacking is 5cm, and the jacking speed is controlled to be 20-50 mm/min.
6.2) Beam movement
And the hydraulic module vehicle transfers the steel-concrete combined beam to the position of the newly-built bridge site according to the moving path.
And path control, speed control, road self-adaptive control, beam attitude and stress control and whole-process safety control are carried out in the moving process.
The path control can be the path marking control carried out on the walking road surface in advance, so that field construction personnel can conveniently carry out visual observation and control, and meanwhile, the Beidou navigation system is utilized to carry out real-time positioning.
The speed control can be realized by setting a speed limit in the hydraulic module vehicle control system in advance and controlling the translation speed within 500 m/h.
The road self-adaptive control can be used for cleaning the walking path again before moving and making protective measures to ensure the walking path to be smooth and barrier-free; when a slope or a concave-convex road surface exists, the hydraulic module vehicle can automatically adapt to the uneven road condition of a translation road, the horizontal state of the beam body is automatically adjusted, the up-down automatic adjustable range of the wheels is +/-30 cm, safety and reliability are realized, and good road surface applicability is ensured.
The beam attitude and stress control can be realized by monitoring the attitude of the beam and the stress state of a key position in real time through an established monitoring system, so that the beam attitude is ensured to be within a controllable range, and the beam stress does not exceed an allowable value.
6.3) basin-type support mounting
And pouring high-strength mortar on the surface of the supporting cushion stone at the in-place part of the scabbling basin type support, leveling and adjusting to a designed elevation. And the pot type support is accurately positioned and installed, and the support bottom plate is fixed through planting bolts.
The single-span steel-concrete combined beam adopts a fixed basin type support (GD), three one-way movable basin type supports (DX) and four two-way movable basin type support Supports (SX), the arrangement form is shown in figure 10, and each basin type support is arranged in parallel with a pier table.
6.4) positioning and beam falling of beam body
After the hydraulic module vehicle is moved to accurately position the steel-concrete combined beam, the height of the hydraulic module vehicle is slowly and synchronously reduced until the beam body is contacted with the basin-type support, the contact condition of each pivot is observed, under the condition that four angular points of the beam body are ensured to be contacted, the hydraulic module vehicle unloads 25% of dead weight load of the beam body, and the contact condition of the support is checked.
If no basin-type support is empty, the hydraulic module vehicle is divided into three stages to unload the load until the beam-carrying support is separated from the beam body, and the beam falling is completed.
And if the local basin-type support is separated, measuring the thickness of the gap, jacking the beam body until the beam body is separated from all basin-type supports, plugging the pad by adopting a steel plate with the same size as all the supports, confirming the space position again, unloading the load in a grading manner until the beam carrying support is separated from the beam body, and finishing the beam falling.
And after the beam falls, welding the upper top plate of the basin-type support and the beam body base plate in a symmetrical and intermittent mode. When welding, the influence on the rubber plate and the polytetrafluoroethylene plate caused by overhigh temperature is prevented, and after welding, rust prevention treatment is carried out on the welding part.
7) Expansion joint installation and bridge floor continuous construction
The main span of the overpass has 2 expansion joints, and is arranged between the reinforced concrete composite beam and the abutment.
7.1) installation of expansion joints
Firstly, chiseling bridge decks, and cleaning surface laitances to expose solid aggregates; leveling the expansion joint to enable the top surface of the expansion joint to be parallel and level with the road surfaces on two sides, welding and fixing main ribs of the expansion joint and reserved fixed reinforcing steel bars, then installing reinforcing steel bar meshes on two sides, filling a foam plate in the middle of the expansion joint and filling the gap, then pouring C50 steel fiber concrete, wetting a base surface before pouring, vibrating the concrete by adopting a 50 handheld vibrating rod in the pouring process, leveling, plastering and drawing the concrete surface layer by utilizing a ruler, and finally covering, sprinkling and maintaining for 7 days by geotextile.
7.2) bridge deck continuous construction
And (5) constructing the steel bars. And (3) carrying out single-side welding lap joint on the 2-span main bars, wherein the lap joint length is 10d, and the lap joint nodes are arranged in a staggered manner and the transverse steel bars are arranged according to the design.
And (5) concrete construction. And (4) erecting a template by using a wood template, pouring C40 concrete, and curing for 7 days.
The installation method provided by the embodiment of the invention can realize safe, quick and convenient installation of the overline overbridge with the main span structure in the form of the steel-concrete composite beam.
Claims (8)
1. A method for installing a overline overbridge, wherein the main span structure of the overline overbridge is a steel-concrete composite beam, and the method is characterized by comprising the following steps of:
1) construction of beam storage site
An enlarged foundation is arranged in the beam storage site, and the top surface of the enlarged foundation is flush with the site hardening layer;
2) construction of support system
The supporting system consists of a beam carrying support and steel pipe supporting legs arranged below the beam carrying support, and all components of the supporting system are processed in a factory and then transported to a beam storage field for assembly;
3) steel box girder processing and beam storage field inner assembly
Processing steel box girders in a factory in sections, performing trial assembly, transporting to a girder storage site, and assembling on a support system;
4) steel-concrete composite beam bridge deck system construction
Performing bridge deck construction, crash barrier construction and bridge deck pavement construction on the assembled steel box girder;
5) hydraulic module vehicle assembling and debugging
After the hydraulic module vehicle is transported to a beam storage site, assembling is carried out; after the assembly is finished, carrying out no-load simulation test on a beam storage site to verify the synchronism and the control performance of the beam storage site;
6) transporting and erecting of beam body
After the hydraulic module cars are assembled and debugged in a beam storage yard, the hydraulic module cars are driven to the positions below the roof distribution beams of the beam bottom carrier support one by one in a preset height posture, the hydraulic module cars are synchronously lifted to lift the beam bodies until the roof distribution beams are separated from the steel pipe supporting legs, the weight of the steel-concrete combined beam and the carrier support is completely borne by the hydraulic module cars, and then the steel pipe supporting legs are dismantled;
the hydraulic module vehicle moves and transports the steel-concrete combined beam to a newly-built bridge site position according to a moving path;
after the hydraulic module vehicle is moved to accurately position the steel-concrete combined beam, the hydraulic module vehicle synchronously reduces the height until the beam body is contacted with the basin-type support; then the hydraulic module vehicle unloads the load in a grading way until the beam-carrying bracket is separated from the beam body, and the beam falling is finished;
7) expansion joint installation and bridge floor continuous construction.
2. The method of installing a flying bridle according to claim 1, wherein: the beam-carrying support consists of steel tube upright posts, a connecting rod for connecting adjacent steel tube upright posts, a roof distribution beam fixed at the lower ends of the steel tube upright posts, a top layer distribution beam fixed at the upper ends of the steel tube upright posts and height-adjusting cushion blocks arranged on the top layer distribution beam.
3. The method for installing a flying bridge according to claim 1, wherein the deck slab construction comprises the steps of:
A. arranging a top plate supporting system in the box;
B. arranging a flange plate supporting system;
C. erecting a bridge deck formwork; the bridge deck plate template is formed by splicing a bamboo rubber plate and a wood beam above a roof supporting system and above a flange plate supporting system in the box;
D. prepressing a support system; after the roof supporting system, the flange plate supporting system and the bridge deck slab are erected, sand bag preloading is adopted, and the load is 1.1 times of the pressure-bearing load required by the roof supporting system and the flange plate supporting system in the box;
E. constructing a bridge deck steel bar;
F. constructing bridge deck concrete; reserving expansion joint reserved grooves at two ends during pouring of the bridge deck slab, and embedding expansion joint fixing reinforcing steel bars;
G. removing the template and the supporting system; the removal of the bridge deck formwork, the roof supporting system in the box and the flange plate supporting system is carried out according to the principle sequence of removing after supporting and removing after supporting.
4. The method for installing a overpass according to claim 1, wherein the crash barrier construction comprises the steps of:
A. constructing crash barrier steel bars;
B. installing an anti-collision guardrail template; before the templates are installed, the bridge deck is leveled by mortar, the crash barrier templates are formed by splicing shaped steel plates, the templates are fastened by screws, plastic adhesive tapes are adhered to joints of the templates, and the joints of the templates and the paving layer are filled with joints by sponge materials;
C. constructing concrete of the anti-collision guardrail;
D. dismantling the anti-collision guardrail template;
E. and (5) maintaining the anti-collision guardrail.
5. The method of installing a flying bridge according to claim 1, wherein said bridge deck pavement construction comprises the steps of:
A. chiseling floating slag and cleaning the bridge floor;
B. coating a waterproof layer;
C. binding steel bars;
D. the drain pipe is embedded;
E. and (5) concrete construction.
6. The method of installing a flying bridle according to claim 1, wherein the transporting and erecting the girder further comprises: the method comprises the following steps of 1, chiseling the surface of a supporting cushion stone at the in-place part of a basin-type support, pouring high-strength mortar, leveling and adjusting to a designed elevation; and the pot type support is accurately positioned and installed, and the support bottom plate is fixed through planting bolts.
7. The method of installing a flying lead overpass of claim 6, wherein: the single-span steel-concrete combined beam adopts a fixed basin type support, three one-way movable basin type supports and four two-way movable basin type supports; each basin type support is arranged in parallel with the pier table.
8. The method for installing a overpass bridge according to any one of claims 1 to 7, wherein the installation of the expansion joint comprises: chiseling the bridge deck, and cleaning surface laitance to expose solid aggregate; leveling the expansion joint to enable the top surface of the expansion joint to be flush with the road surfaces on the two sides, welding and fixing main ribs of the expansion joint and reserved fixed reinforcing steel bars, then installing reinforcing steel bar meshes on the two sides, filling a foam plate in the middle of the expansion joint and filling the gap, then pouring steel fiber concrete, wetting a base surface before pouring, vibrating the concrete by adopting a vibrating rod in the pouring process, leveling, plastering and drawing the concrete surface layer by utilizing a ruler, and finally covering, sprinkling and curing by geotextile.
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