CN112538814A - Construction process of transversely prefabricated and assembled corrugated steel web PC combined box girder for bridge construction - Google Patents
Construction process of transversely prefabricated and assembled corrugated steel web PC combined box girder for bridge construction Download PDFInfo
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- CN112538814A CN112538814A CN201910909699.6A CN201910909699A CN112538814A CN 112538814 A CN112538814 A CN 112538814A CN 201910909699 A CN201910909699 A CN 201910909699A CN 112538814 A CN112538814 A CN 112538814A
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- 238000012545 processing Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 238000009415 formwork Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000009417 prefabrication Methods 0.000 abstract description 3
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Classifications
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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
-
- 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
-
- 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
- E01D2101/28—Concrete reinforced prestressed
Abstract
A construction process of a transversely prefabricated and assembled corrugated steel web PC combined box girder for bridge construction comprises two construction procedures: the first part is a prefabricated I-beam; the second part is to assemble the PC combined box girder on the bridge pier. The construction process comprises the following steps: the whole beam is firstly processed into an I-beam in a prefabrication yard and then assembled into the PC combined box beam in a bridge construction station, so that the cost is low, the quality is good, and the PC combined box beam is environment-friendly.
Description
The technical field is as follows:
the invention relates to a construction process technology for building a bridge, in particular to a construction process technology for a transversely prefabricated and assembled corrugated steel web PC combined box girder for building the bridge.
Background art:
the prior box girder of the bridge is basically all made of prestressed concrete structure, and the span of 50cm is transversely prefabricated and assembled with the corrugated steel web PC combined box girder, and the structure is characterized in that: the whole weight is big, the installation is inconvenient, transportation and hoist and mount are inconvenient after the prefabricated site is prefabricated into whole, easily produce crackle rejection rate when the web is prefabricated high, with high costs, efficiency poor.
The invention content is as follows:
in order to solve the problems in the background art, the invention provides a construction process of a transversely prefabricated assembled corrugated steel web PC combined box girder for bridge construction, and the application of the process better solves the problems in the background art.
The technical scheme of the invention is as follows:
the first part is a prefabricated I-beam and consists of the following steps: processing and manufacturing bottom plate steel bars of the prefabricated I-shaped beam, mounting → mounting a bottom plate corrugated pipe → manufacturing a corrugated steel web, mounting → manufacturing a bottom plate template, mounting → manufacturing top plate steel bars of the prefabricated I-shaped beam, mounting → mounting a top plate corrugated pipe → threading bottom top plate steel strands → tensioning B1 steel bundles; the second part is a PC combined box girder which consists of the following procedures: manufacturing and installing transverse partition plates, end cross beams and bottom top plate reinforcing steel bars → manufacturing and installing transverse partition plates, end cross beams and bottom top plate formworks and casting and maintaining concrete in situ → tensioning B2, B3 steel bundles → B2 and B3 steel bundles for pore grouting and anchor sealing to form a PC combined box beam → pouring middle cross beam concrete → tensioning hogging moment steel bundles (T2 and T1) and grouting and anchor sealing the combined box beam.
The invention has the following effects:
● solves the problem of construction technology of corrugated steel web PC combined box girder with longest span of 50cm in China.
● the prefabricated bridge site assembly connection of the prefabricated yard has simple construction process and enhances the standardization, industrialization and assembly ratio degree.
● the construction speed is increased by 20% compared with the traditional construction technology.
The specific implementation mode is as follows:
the implementation method of the invention comprises the following steps:
the first part is a prefabricated I-beam and consists of the following steps: processing and manufacturing of a bottom plate steel bar of the prefabricated I-shaped beam, mounting (1) → bottom plate corrugated pipe mounting (2) → corrugated steel web manufacturing, mounting (3) → bottom plate formwork manufacturing, mounting (4) → top plate steel bar manufacturing of the prefabricated I-shaped beam, mounting (5) → top plate corrugated pipe mounting (6) → bottom top plate steel strand threading (7) → tensioning B1 steel strand (8); the second part is a PC combined box girder which consists of the following procedures: and (2) manufacturing and installing transverse partition plates, end cross beams and bottom top plate reinforcing steel bars, (9) manufacturing and installing the transverse partition plates, the end cross beams and the bottom top plate formworks, and performing cast-in-place and maintenance (10) of concrete → tensioning B2, B3 steel bundles (11) → B2 and B3 steel bundles, grouting and sealing anchors to form a PC combined box beam (12) → pouring middle cross beam concrete (13) → tensioning negative bending moment steel bundles (T2 and T1), grouting and sealing anchors (14) to form the combined box beam.
Engineering example:
1. brief description of the engineering
The total length of a bridge from a Zhengzhou airport built by Heilongjiang agricultural reclamation building engineering road bridge Limited to a second-stage three-standard mainline Jialu river bridge of a Zhou Xihua expressway is 766.77m, wherein the main bridge adopts a corrugated steel web PC combined box girder.
The length of a main bridge is designed to be 100m, the aperture is arranged to be 2 x 50m, the number of 2 holes is 16, the bridge is designed to be left and right, 4 prefabricated I-beams with single hole are arranged, after the prefabricated I-beams are installed, every 1 middle beam and 1 side beam are combined, a combined box beam is formed by a cast-in-place top plate, a bottom plate, a transverse partition plate and an end partition plate, and the width of the top surface of the combined box beam is 16.75m after the single transverse 4 prefabricated I-beams are combined; the centers of all webs of the prefabricated I-shaped beam are equal in height, and the heights of the webs are 3 m.
The planning navigation grade of the main bridge is IV grade, the net height of the one-way navigation hole is 9.5m, the net width is 45m, and the number of the navigation holes is 2.
2. Structural design features
The corrugated steel web PC combined box girder is a combined structure formed by using a corrugated steel web to replace a concrete web, namely a steel-concrete combined structure. The steel-mixed connection adopts a mixed shear connector, all welding seams of the corrugated steel web plate can be welded in a factory, and the sections of the corrugated steel web plate are connected through high-strength bolts after being transported to a prefabricating field. The prefabricated corrugated steel web has the advantages that the defect of heavy self weight of concrete is overcome due to light weight of the web, the steel web is made of Q345 high-grade thin steel plates, the strength is high, the crack resistance is good, the problem that the web of the box girder is easy to crack is avoided, and the advantages of a steel-concrete combined structure are fully exerted.
The construction of the corrugated steel web PC combined box girder is that a transverse prefabrication and splicing technology is utilized, the cross section of the corrugated steel web PC combined box girder is firstly broken into parts to form two corrugated steel web PC I-shaped girder units, then the two prefabricated corrugated steel web PC I-shaped girder units are transversely connected through wet joints, and the parts are spliced to form the corrugated steel web PC combined box girder. The prefabrication, assembly, factory production and standardization of the medium-span corrugated steel web combined box girder bridge are realized. The prefabricated corrugated steel web PC I-beam only bears the self weight of the structure and the construction load, and the second-stage constant load and the live load are borne by the formed box beam.
The prefabricated corrugated steel web PC I-beam has the problem of buckling instability under the action of external force due to weak lateral rigidity, and the lateral stability of the prefabricated corrugated steel web PC I-beam is related to the width of a concrete top bottom plate, the thickness of an end cross beam and the number of transverse clapboards.
3. Process flow
3.1 stage of prefabricating I-beam
Preparing work, constructing a prefabricated site, manufacturing a bottom die (base), processing and manufacturing bottom plate steel bars of a prefabricated I-shaped beam, installing (1), installing bottom plate corrugated pipes (2), manufacturing and installing corrugated steel webs (3), manufacturing and installing bottom plate templates (4), pouring bottom plate concrete and maintaining, removing a bottom plate formwork, manufacturing a top plate template, installing, processing and manufacturing top plate steel bars of the prefabricated I-shaped beam, installing (5), installing top plate corrugated pipes (6), pouring top plate concrete and maintaining, removing the top plate formwork, penetrating bottom top plate steel strands (7), stretching a B1 steel bundle (the prefabricated I-shaped beam is stretched once) (8), and pressing and sealing the hole of the B1 steel bundle.
3.2 prefabricating I-beam combined box beam stage
Processing and manufacturing and mounting (9) of reinforcing steel bars of a diaphragm plate, an end beam and a bottom top plate, manufacturing and mounting (10) of a diaphragm plate, an end beam and a bottom top plate template, casting and maintaining (11) of concrete of the diaphragm plate, the end beam and the bottom top plate, tensioning B2 and B3 steel bundles (prefabricating an I-beam for secondary tensioning) (12), grouting a pore channel of B2 and B3 steel bundles, sealing an anchor (forming a PC combined box beam) (13), pouring and maintaining middle beam concrete, maintaining negative bending moment steel bundles (T2 and T1 steel bundles), grouting a pore channel of T2 and T1 steel bundles, sealing an anchor (14), and removing a temporary support (completing system conversion to form a continuous PC combined box beam).
4. Measures for controlling the quality of the process
4.1 wave-shaped steel web I-beam prefabricating field construction
And the prefabricated field adopts totally-enclosed standardized construction and management. The number of pedestals of the precast beams is distributed according to a total organization plan and the design number of the precast beams, and the design of the pedestal form is determined according to the structural characteristics of the precast beams and the geological condition of a precast beam field; the top surface of the pedestal must be accurately pre-arched according to design requirements.
4.2 processing and mounting of corrugated steel webs
4.2.1 working
(1) The processing of the corrugated steel web plate needs to be produced by a professional manufacturer, the whole process is monitored during production, various technical indexes need to be detected before delivery, and the corrugated steel web plate can be transported to the site after being detected to be qualified; and carrying out secondary inspection after the product is on site, and inspecting the product to be qualified for use.
(2) The method comprises the following steps of (1) processing important detection/inspection control items of the corrugated steel web: quality inspection of various raw materials; testing the quality of the test piece/processed finished product; production capacity of processing equipment; welding seam quality; structure size; sixthly, the thickness of the coating layer is increased; and the drawing force.
4.2.2 mounting
(1) Each section of the corrugated steel web plate is connected by a 10.9-grade M22 friction type single-nut high-strength bolt (provided with a nut and two gaskets), and the connected high-strength bolt is a product of a professional manufacturer; during fastening, the bolt is fastened by combining an electric torque wrench and a manual torque wrench; and (4) completing final torsion of all the bolts before pouring the bottom plate concrete, and performing rechecking before paint repair.
(2) And assembling each section of the corrugated steel web by adopting a gantry crane to cooperate with workers. Before installation, accurately determining the position of a steel web on a steel plate on the top surface of a pedestal, and then sequentially installing corrugated steel webs according to the marked positions on the steel plate on the top surface of the pedestal; the method for assembling, positioning and fixing the corrugated steel web on site comprises the following steps: a steel bar bracket for controlling the elevation of the steel web is placed on the steel plate on the top surface of the pedestal (the elevation of the top surface of the steel bar bracket is the elevation of the lower edge line of the steel web), and the bracket is used for supporting, positioning and reinforcing the lower edge of the steel web so as to ensure the accuracy of the height position and the straightness of the web (the contact part of the bracket and the steel plate on the top surface of the pedestal adopts a high-strength mortar cushion block); meanwhile, steel pipe transverse inclined supports are arranged on two sides of the web plate to ensure the stability and perpendicularity of the web plate, and the end part of the steel pipe at the contact point of the steel pipe and the corrugated steel web plate is wrapped by geotextile to prevent the coating layer of the corrugated steel web plate from being damaged.
(3) In the installation process of the corrugated steel web plate, the corrugated steel web plate needs to be accurately positioned according to the requirements of a design drawing, the flatness of the joint of each section is controlled by a horizontal ruler, and the verticality of each section is controlled by a plumb bob; the damaged part of the coating layer needs to be repaired in time.
(4) Because the concrete top plate and the concrete bottom plate of the prefabricated I-beam are separately poured, after the concrete bottom plate is poured, the supporting steel pipes on the two sides of the corrugated steel web plate still need to be reserved, and the bottom surface of the concrete diaphragm plate is supported by battens to prevent the concrete diaphragm plate from inclining; and after the top plate concrete is poured, performing stability reinforcement on the precast beam body by using battens on two sides of the top plate at the continuous end.
(5) The method comprises the following steps of (1) installing important detection/inspection control items of the corrugated steel web: checking a processed finished product; secondly, controlling the height; axial deviation control; fourthly, controlling the straightness; controlling the verticality; sixthly, supporting and fixing the two sides; seventhly, controlling the depth of the steel web embedded into the concrete; controlling the torque of the bolt; ninthly, coating and repairing on the construction site and the like.
4.3, processing and installing prefabricated I-beam steel bars
4.3.1 working
(1) The processing operation of the reinforcing steel bars is intensively and uniformly manufactured in the reinforcing steel bar processing shed, and the through reinforcing steel bars are welded on site after being pre-bent at a good angle in the processing shed; when the reinforcing steel bar is processed, blanking and forming are carried out according to the size of the design requirement strictly, binding and welding of the reinforcing steel bar are carried out according to the requirement of the design drawing strictly, and the standard requirement must be met during welding.
(2) The steel bars are inspected again before being processed, the surfaces of the steel bars are clean, free of damage, free of oil stains and the like, and the steel bars are straightened when being not straight and bent locally; the surface of the processed steel bar should not have a flaw weakening the section of the steel bar.
4.3.2 mounting
(1) The steel bar spacing is controlled by adopting a shaped formwork during the installation of the steel bar, and the tooth block steel bar is installed on the pedestal after being integrally bound.
(2) The reinforcing steel bar protective layer is controlled by high-strength mortar cushion blocks with the same marks as the main beam concrete.
(3) In the process of installing the steel bars, the positions of the designed reserved hole channel, the embedded part, the embedded steel bars and the steel bars under the anchor are accurately positioned, and the fixation is ensured to be firm.
(4) After the welding of the steel bars is finished, all welding slag must be knocked away, and the welding of the steel bar framework is carried out under the pedestal as much as possible, so that the pollution of the welding slag to the surfaces of the pedestal steel plate and the template is reduced.
(5) When the installation position of the steel bar conflicts with the position of the prestressed pipeline or the anchor part, the position of the steel bar is properly adjusted according to the design requirement, and the position of the prestressed pipeline is ensured to meet the design requirement; when the reinforcing steel bars are welded, the corrugated pipe is prevented from being burnt by electric welding, whether the corrugated pipe is intact or not is carefully checked before concrete pouring, and if a damaged part exists, the corrugated pipe is wrapped by a rubber belt in time.
(6) The reinforcing steel bars comprise penetrating reinforcing steel bars and non-penetrating reinforcing steel bars of the corrugated steel web plates; when the special-shaped through reinforcing steel bars of the gradual change section of the bottom plate are installed, the installation of the special-shaped through reinforcing steel bars and the installation of the corrugated steel web plate are carried out simultaneously, otherwise, the installation of the through reinforcing steel bars cannot be carried out; the bottom plate standard section penetrating steel bars are installed before the bottom plate template is installed, and the template can be installed after the bottom plate penetrating steel bars and the corresponding non-penetrating steel bars are welded and fixed; installing the top plate steel bars after the top plate template is installed; all corrugated steel web penetrating steel bars and non-penetrating steel bars must be effectively welded according to design requirements.
(7) And strictly controlling the embedding depth of the corrugated steel web plate embedded into the reinforcing steel bars of the lining section.
(8) And after the strength of the bottom plate concrete reaches the design strength value, the mounting construction of the top plate steel bars is started.
4.4 processing and installing of prefabricated I-beam template
4.4.1 working
The top plate template and the bottom plate template are both formed by adopting shaped steel templates, the templates are processed by professional manufacturers, the template panel is processed by adopting a steel plate with the thickness of 6mm, and the flange plate is processed by adopting a steel plate with the thickness of 10mm, so that deformation is avoided in the using process; before formal use, after on-site trial assembly is correct, mounting, supporting and reinforcing can be carried out; before the template is installed, the high-quality release agent is coated uniformly and comprehensively.
4.4.2 mounting
(1) Pre-burying a pull rod counter-pulling hole during manufacturing of the concrete platform, and performing counter-pulling fixation by adopting a pull rod with the diameter of 16mm after the bottom plate template is installed; in order to prevent slurry leakage during concrete pouring: firstly, connecting parts between the templates and the pedestal adopt double faced adhesive tapes to control seams; secondly, a layer of thin floor leather is adhered to the inner side of the side die of the comb plate, the thin floor leather is cut at the corresponding reserved rib opening, and meanwhile, the thin floor leather is sealed and blocked by foamed rubber on the outer side.
(2) The top plate template adopts a steel pipe support mode, phi 48 steel pipe supports are arranged on two sides of the pedestal, and the back ribs adopt 10-10 cm battens; after the top plate bottom die is installed and calibrated, installing flange plate side dies, wherein the flange plate side dies are connected with the bottom die through screws; after the flange plate side die and the top plate bottom die are completely installed, the height and the linearity are comprehensively detected, and the linearity is ensured to be attractive.
4.5 precast I-beam concrete pouring and maintenance
(1) The prefabricated I-beam concrete is high-quality C55 high-strength concrete, and the maximum particle size of broken stones is not more than 20 mm; in the concrete pouring construction, the bracket for fixing the steel web plate, the corrugated pipe and the anchor backing plate need to be prevented from being collided, and the protection of the embedded steel bars needs to be paid attention to so as to ensure the accuracy of the positions of the embedded steel bars; and vibrating at the dense part of the reinforcing steel bars by adopting a 30-type vibrating rod.
(2) When concrete is poured, pouring is sequentially carried out from one end of the I-shaped beam to the other end of the I-shaped beam; pouring the bottom plate concrete in two layers, wherein the first layer is poured to the chamfer angle, and the second layer is poured to the top surface of the bottom plate concrete; the diaphragm plate, the end beam and the beam end concrete section are cast in the same batch in layers with the bottom plate concrete, the top surface of the cast concrete of each layer is 3cm above the lower edge line of the top plate chamfer angle when the thickness of the concrete of each layer is not more than 30cm., and 2cm is chiseled when the top plate concrete is to be cast; and (4) pouring the top plate concrete layer by layer, wherein the thickness of each layer is not more than 30cm.
(3) The concrete pouring process can not be interrupted at will, and the upper-layer concrete is poured and vibrated before the lower-layer concrete is initially set; after concrete pouring is finished, secondary contraction is adopted, the top surface of the bottom plate concrete is a smooth surface, and the top surface of the top plate concrete is galling; and (3) starting maintenance after the strength of the concrete is initially set, wherein the maintenance adopts a mode of geotextile covering and automatic spraying to ensure that the concrete surface is always kept moist.
4.6 tensioning and grouting of prefabricated I-beam steel bundle
4.6.1 tensioning
(1) Before pouring concrete, a plastic liner pipe is penetrated into the plastic corrugated pipe to prevent cement slurry from blocking the pipeline during pouring concrete; the steel strand is threaded before tensioning, the steel strand is threaded from one end by a threading device, a conical protective sleeve is adopted at the end of the steel strand during threading to prevent the steel strand head from piercing a pipeline and reduce threading resistance, and violent impact is avoided to avoid piercing the pipeline if the steel strand is difficult to thread in the process of threading the steel strand.
(2) When the solid strength and the elastic modulus of the prefabricated I-beam concrete reach more than 90% of the design values and the concrete age is not less than 7 days, tensioning the prestressed steel strands; tensioning in stages during tensioning: 0 → 10% delta con (measuring the elongation) → 20% delta con (measuring the elongation) → 100% delta con (measuring the elongation) → holding the load for 5min for anchoring, and during the prestress tensioning, the elongation and the tensioning force are controlled in a double mode, the tensioning force is taken as the main mode, and the allowable deviation between the actual elongation and the calculated elongation is controlled within 6%.
(3) The tensioning equipment adopts an LJ-ZLC1 type prestress intelligent control tensioning system, and adopts a tensioning mode with two symmetrical ends during tensioning so as to prevent a beam body from lateral bending; controlling tension according to a steel strand of a top plate and a bottom plate designed according to a drawing, and selecting 4 450T jacks; the device is realized in the tensioning process: firstly, dynamic real-time control is carried out, and stress is accurately applied; secondly, the elongation is checked in time to realize double control; synchronously tensioning by four jacks; fourthly, computer management software is adopted; intelligently controlling and standardizing the tensioning process; sixthly, the tension force has double protection functions.
(4) Stabilizing for 2h after tensioning is finished, checking the anchored clamping pieces, keeping the top surfaces of the clamping pieces to be flush, ensuring that the mutual dislocation of the clamping pieces is not more than 2mm, and ensuring that the height exposed outside the anchorage device is not more than 4 mm; after the abnormal conditions are carefully checked, cutting off redundant steel strands by using a grinder, strictly forbidding to adopt electric arc for cutting, and simultaneously avoiding damaging the anchorage device; the exposed length of the cut prestressed steel strand is not less than 30mm, and a steel sleeve is used for sealing the anchor head to prepare for grouting construction; during construction, the steel strands and the anchorage devices need to be properly protected, and the beam end enclosure and the baffle plate cannot be withdrawn before the pipeline is not grouted. 4.6.2 grouting
(1) And after the prestressed steel strands are tensioned and anchored, grouting the pore canal as early as possible, and finishing within 48 hours.
(2) The pore slurry is pressed by special pressing slurry, and all performance indexes of the pressing slurry can be used after being detected to be qualified.
(3) The grouting equipment adopts an LJ-YJA1 large-circulation intelligent grouting system, has a full-automatic intelligent control function, and provides technical guarantee for the quality of pore canal grouting: firstly, accurate measurement is carried out; secondly, stirring at high speed to prepare pulp; thirdly, storing and stirring at low speed to prevent sedimentation; fourthly, the continuous screw rod grouting has the automatic pressure maintaining function; adopting computer management software; sixthly, intelligently controlling and standardizing the operation process; the automatic protection mechanism and the automatic error detection capability.
4.7 prefabricated I-beam transportation and installation
(1) Selection of mechanical equipment: according to the design weight of the precast beam, under the condition of fully considering the construction safety coefficient, the mechanical equipment and the accessories matched with the precast beam are correctly selected.
(2) And determining a feasible construction scheme according to the actual situation of the site, performing expert demonstration on the special construction scheme of the key link, and organizing and implementing the special construction scheme strictly according to the optimized special construction scheme passing the demonstration.
(3) And (3) transportation: firstly, two 150T gantry cranes are adopted in a precast beam yard, and the two ends of a precast I-beam are simultaneously and vertically lifted from a precast beam pedestal and placed on a self-propelled tire type trolley for transportation; during hoisting, steel plate corner protectors are arranged at the corners of the precast beams to protect concrete at the contact surfaces of the steel wire ropes and the beam bodies from being damaged; secondly, C25 concrete is adopted for the beam transportation road, the road width is 5.0m, the thickness is 30cm, and the longitudinal slope is not more than 0.3 percent; thirdly, when the second hole is erected, the tire type beam transporting trolley walks after the box girder is combined and formed in the first hole (namely B2 and B3 steel bundle tensioning is completed), sleepers and steel plates are laid at the walking route of the tire type beam transporting trolley in the first hole to diffuse pressure, the sleepers are laid at the transverse width of 4m and the distance of 20cm, the steel plates with the width of 2cm are laid on the sleepers, and the beam transporting trolley walks to the beam feeding position of the bridge girder erection machine on the steel plates; fourthly, in the transportation process of the prefabricated I-beam, a temporary support for preventing instability is required to be arranged; the temporary support is arranged at the supporting point of the trolley by adopting a lead screw with the diameter of 15cm (2 in total and respectively arranged at two ends), and the I-shaped beam is locked by a chain block.
(4) Installation: accurately positioning in sequence according to the erection sequence of the prefabricated I-beams by adopting a 300T bridge girder erection machine; confirming that the mounting quality of the temporary support and the permanent support is qualified before mounting; and log with the diameter of 200mm is adopted to simultaneously and symmetrically support the upper part and the lower part of the beam body on two sides of two ends of the beam body in time after the I-beam is installed, and the chain block is used for symmetrical diagonal pulling to prevent the beam body from inclining and laterally sliding at the support end of the temporary steel drum, and meanwhile, the transverse steel bars among the prefabricated beam bodies are temporarily connected in time, and the stability of the I-beam before being converted into the box body is ensured through temporary reinforcement of the installed I-beam.
4.8 transverse wet joint template processing and installation
4.8.1 working
The template surface adopts a large high-quality bamboo plywood special for the high-strength bridge with the thickness of 20mm, and the assembly of the bamboo plywood is processed on site linearly according to the size of each section.
4.8.2 installation
(1) Base plate
Combining templates: the panel adopts 20mm thick special bamboo offset plate of high-quality bridge, and the main joist adopts two 12# channel steels back to setting up, the secondary joist adopts 10# channel steel, and rings adopt phi 20mm round steel and M27 turnbuckle combination, and the hanging beam adopts two 12# channel steels back to setting up.
Secondly, installation: the panel is directly laid on the longitudinal No. 10 channel steel, and the center distance of the channel steel is 300 mm; 10# channel steel is paved on a main keel of a transverse 12# channel steel, and the distance between the main keels is 1800 mm; the 12# channel steel is fixedly hoisted by a hoisting ring formed by combining round steel with the diameter of 20mm and M27 turn buckle bolts, the upper end of the hoisting ring is fixed on a hanging beam striding over the top plate, the distance between the hanging beam and a main keel is 1800mm, the span is the width of a wet joint, and the hoisting ring is used for bearing load on the hanging beam.
(2) Top board
The main keel and the secondary keel of the bamboo plywood panel are both 10 x 10cm battens and 40cm apart, and are hoisted and fixed on a transverse hoisting beam by a phi 16mm pull rod, and the hoisting beam is arranged by two 12# channel steels in a back-to-back mode and is 1500mm apart.
4.9 transverse Wet Joint Reinforcement installation
The cast-in-place wet joint reinforcing steel bars and the reserved connecting reinforcing steel bars corresponding to the prefabricated I-shaped beam need to be welded one by one, single-side welding is adopted, and the length of a single-side welding seam is not less than 10d of the diameter of the welded reinforcing steel bar; a working groove is reserved at the position of a tooth block stretched by a steel bundle, the length of the groove opening is 1.5m, and the cut steel bar at the position of the working groove is reinforced by adopting the principle of equal strength during sealing.
4.10 pouring of transverse wet joint concrete
Pouring the wet joint concrete by adopting a concrete delivery pump; the concrete pouring needs to determine the concrete pouring time period according to the weather conditions, and the secondary concrete pouring and vibrating are guaranteed to be finished before the front concrete is condensed in the pouring process.
4.11 stretching and grouting of steel beam of corrugated steel web combined box girder
And after all the prefabricated I-beam concrete wet joints of the single-width single-hole are completely finished and the concrete strength reaches 90% of the design value and is not less than 7d, carrying out tensioning and grouting on the steel bundles in the combined box beam, wherein the tensioning and grouting adopt the same equipment and mode of tensioning and grouting the steel bundles of the prefabricated I-beam.
4.12 middle cross beam steel bar installation
After tensioning and grouting of the combined box girder of the adjacent holes are finished, steel bars of the middle cross beam can be installed, single-side welding is adopted for connection of reserved steel bars of the prefabricated I-shaped beam, the length of a single-side welding seam is not less than 10d of the diameter of the welded steel bars, the corresponding reserved connecting steel bars need to be welded one by one, and when the steel bars are welded, the spherical support seat needs to be protected from being burnt.
4.13 tension and mud jacking of hogging moment steel bundle (T-shaped steel bundle)
After the strength of the cast-in-situ concrete of the middle cross beam reaches 90% of the design value and is not less than 7d, carrying out roof T steel beam tensioning and grouting and anchor sealing; the tensioning and grouting are performed by the same tensioning and grouting equipment and mode of the prefabricated I-beam steel beam.
4.14 Release of abutment connection
And removing the upper and lower steel plate connecting pieces of the permanent support at the simply supported end of the precast beam before tensioning the T steel beam, removing the upper and lower steel plate connecting pieces of the permanent support at the continuous end after tensioning the T steel beam, and removing the temporary support of the steel barrel to complete system conversion.
4.15 temporary support manufacturing and installation
The temporary support adopts a steel barrel sand leakage mode, the inner steel barrel and the outer steel barrel both adopt seamless steel pipes, and the sand filled in the steel barrels adopts clean and dry medium sand; D377X 11 steel pipes are adopted for the outer steel barrel, D351X 11 steel pipes are adopted for the inner steel barrel, 2 cm-thick steel plates are respectively adopted for welding the bottom surface of the outer steel barrel and the top surface of the inner steel barrel to serve as supporting surfaces, and a tetrafluoro steel plate is welded on the 2 cm-thick steel plate on the top surface of the inner steel barrel, so that the longitudinal beam body can freely move when the steel beam of the bottom plate of the combined box beam is tensioned; meanwhile, the steel drum is connected with the embedded ribs on the top surface of the concrete of the cover beam so as to ensure the stability of the temporary steel drum.
4.16 water stop treatment of contact part of corrugated steel web plate and concrete surface
And sealing water-stopping materials are arranged at the joints of the prefabricated I-beam concrete bottom plate, the diaphragm plate, the end cross beam and the beam body two-end lining concrete sections and the corrugated steel web plate for sealing, the water-stopping materials are high-molecular polyurethane building sealing paste, and the water-stopping sealing treatment is finished before the prefabricated beam is installed.
Claims (3)
1. A construction process of a transversely prefabricated and assembled corrugated steel web PC combined box girder for bridge construction comprises two construction procedures: the first part is a prefabricated I-beam and consists of the following steps: processing and manufacturing of a bottom plate steel bar of the prefabricated I-shaped beam, mounting (1) → bottom plate corrugated pipe mounting (2) → corrugated steel web manufacturing, mounting (3) → bottom plate formwork manufacturing, mounting (4) → top plate steel bar manufacturing of the prefabricated I-shaped beam, mounting (5) → top plate corrugated pipe mounting (6) → bottom top plate steel strand threading (7) → tensioning B1 steel strand (8); the second part is a PC combined box girder which consists of the following procedures: and (2) manufacturing and installing transverse partition plates, end cross beams and bottom top plate reinforcing steel bars, (9) manufacturing and installing the transverse partition plates, the end cross beams and the bottom top plate formworks, and performing cast-in-place and maintenance (10) of concrete → tensioning B2, B3 steel bundles (11) → B2 and B3 steel bundles, grouting and sealing anchors to form a PC combined box beam (12) → pouring middle cross beam concrete (13) → tensioning negative bending moment steel bundles (T2 and T1), grouting and sealing anchors (14) to form the combined box beam.
2. The construction process of the transverse prefabricated assembled corrugated steel web PC combined box girder for the bridge construction according to claim 1, is characterized in that: the upper box girder plate (1) and the lower box girder plate (3) are formed by wet-jointing and assembling two I-beams at a construction and installation station of a bridge.
3. The construction process of the transverse prefabricated assembled corrugated steel web PC combined box girder for the bridge construction according to claim 1, is characterized in that: the thickness of the corrugated steel web plate (2) is more than or equal to 3mm, and the radius of the corrugation is more than 0.3 m.
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Cited By (1)
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| CN114960434A (en) * | 2022-05-18 | 2022-08-30 | 中铁大桥勘测设计院集团有限公司 | Prefabricated and solidified pier beam construction method and pier beam structure |
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