CN109518615B - High-precision superposition method for precast concrete bridge deck slab and steel beam of steel-concrete composite beam - Google Patents
High-precision superposition method for precast concrete bridge deck slab and steel beam of steel-concrete composite beam Download PDFInfo
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- CN109518615B CN109518615B CN201910036271.5A CN201910036271A CN109518615B CN 109518615 B CN109518615 B CN 109518615B CN 201910036271 A CN201910036271 A CN 201910036271A CN 109518615 B CN109518615 B CN 109518615B
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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Abstract
The invention discloses a high-precision superposition method for a precast concrete bridge deck and a steel beam of a steel-concrete composite beam, which comprises the following steps of: preparing a precast concrete bridge deck; setting a superposition positioning reference; overlapping the precast concrete bridge deck and the steel beam; before the precast concrete bridge deck embedded part and the steel beam are welded and before a factory wet joint is poured, strong constraint connection is carried out on the wet joint; and welding the butt-joint welding seams between the precast concrete bridge deck and the steel beam partition plate and the butt-joint welding seams between the precast concrete bridge deck and the peripheral embedded steel plates, pouring the wet joint concrete of a factory, and finishing the superposition construction of the concrete bridge deck. According to the invention, the steel bars between the wet joints of the steel-concrete composite bridge adopt a high-precision superposition manufacturing technology of the precast concrete bridge deck and the steel beam of the mechanical connecting joint, the connection precision of the precast concrete bridge deck, the steel beam and the steel bars is controlled through the setting of the base line positioning datum, and the alignment precision of the precast concrete bridge deck and the steel beam is quickly and effectively realized.
Description
Technical Field
The invention relates to the field of bridge manufacturing, in particular to a high-precision superposition method for a precast concrete bridge deck and a steel beam of a steel-concrete composite beam in the field of bridge manufacturing.
Background
The concrete bridge deck slab is in the composite beam and an important part thereof, not only bears the whole load effect of the full bridge together with the steel girder, but also directly bears the live load on the bridge deck, the concrete bridge deck slab is formed by welding the prefabricated concrete bridge deck slab and the traditional steel bars in an overlapping manner, the problem of mechanical property reduction caused by heating the steel bars is solved in the mode, particularly the brittle failure problem is solved, the construction quality of wet joints is favorably improved, but great difficulty is brought to the prefabrication precision of the bridge deck slab and the control of the superposition precision of the bridge deck slab and the steel beams, and the prefabrication of the high-precision bridge deck slab and the superposition of the high-precision and the steel beams are a large construction technical challenge facing.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a high-precision superposition method for a precast concrete bridge deck and a steel beam of a steel-concrete composite beam.
The technical scheme is as follows: the invention relates to a high-precision superposition method for a precast concrete bridge deck and a steel beam of a steel-concrete composite beam, which comprises the following steps of:
(1a) preparing a precast concrete bridge deck: preparing a precast concrete bridge deck by adopting a precast mould;
(1b) setting a superposition positioning reference: when the combined beam is assembled in a total mode, firstly, manufacturing of pure steel beam parts is sequentially completed on a total assembling jig frame according to the manufacturing line shape, then, section longitudinal baselines of the precast concrete bridge deck are accurately released on steel beams by utilizing paired measuring towers at two ends of the total assembling jig frame, and the section longitudinal baselines and the section transverse baselines are used as longitudinal and transverse positioning benchmarks for the precast concrete bridge deck lamination;
(1c) precast concrete decking and girder steel coincide: the method comprises the steps that a precast concrete deck slab is in place by taking a reference line arranged on a steel beam and precast concrete deck slab pre-embedded steel members as a reference, fine adjustment is carried out on the precast concrete deck slab, a precast concrete deck slab pre-embedded T-shaped partition plate and a periphery pre-embedded steel plate are ensured to be accurately matched with a steel beam partition plate and inner and outer web plate flange plates, so that steel bar joints at wet joints of adjacent precast concrete deck slabs are accurately aligned, and mechanical connection is carried out; the connection quality meets the quality requirement of the first-level steel bar joint;
(1d) before the precast concrete bridge deck embedded part and the steel beam are welded and before a wet joint of a factory is poured, strong constraint connection is carried out on the wet joint; namely, factory wet joint splicing plates are prepared and connected, and construction site wet joint process splicing plates are connected, so that the influence of welding and concrete shrinkage on the relative position of the precast concrete bridge deck is small;
(1e) and welding the butt-joint welding seams between the precast concrete bridge deck and the steel beam partition plate and the butt-joint welding seams between the precast concrete bridge deck and the peripheral embedded steel plates, and finally pouring the wet joint concrete of the factory to finish the superposition construction of the concrete bridge deck.
The preparation of the precast concrete bridge deck of the step (1a) comprises the following steps:
(2a) sequentially installing a square base, a bottom die positioned on the upper layer of the base and side dies positioned on the upper layer of the bottom die and distributed along the periphery of the edge of the bottom die, forming a space for accommodating a precast concrete deck slab between the side dies and the bottom die, and arranging a groove for positioning a T-shaped embedded part and an embedded plate on the bottom die; the side die is provided with a plurality of first positioning holes for positioning the reinforcing steel bars, the outer side of the side die is provided with a plurality of demoulding devices distributed at intervals, the inner side of the side die is provided with a plurality of core dies for positioning the reinforcing steel bars, the core dies are provided with a plurality of second positioning holes for positioning the vertical reinforcing steel bars and a plurality of positioning grooves for positioning the transverse reinforcing steel bars, and the second positioning holes are matched with the first positioning holes; the lower layer of the base is provided with a plurality of lifting devices for lifting the bottom die;
(2b) positioning the T-shaped embedded part and the embedded plate by utilizing a groove arranged on the bottom die, positioning the transverse bar and the vertical bar by utilizing a first positioning hole arranged on the side die and a second positioning hole arranged on the core die, installing a reinforcing mesh, casting concrete, and manufacturing a precast concrete bridge deck;
(2c) and after the precast slab is finished, removing the core mould, removing the side mould by using a demoulding device, and finishing demoulding of the bottom mould by using a lifting device to finish the manufacture of the precast concrete deck slab.
The bottom die comprises a first bottom die and a second bottom die positioned on the upper layer of the first bottom die; the first bottom die is provided with grooves which are distributed in parallel at intervals and used for positioning the T-shaped embedded members; the second bottom die is provided with notches which are distributed at intervals in parallel and communicated with the grooves and used for the T-shaped embedded members to penetrate through.
The demoulding device comprises a slide rail fixed on the edge of the bottom mould and a lead screw with one end fixed on the side mould.
In the step (1c), when the precast concrete bridge deck is in place, the precast concrete bridge deck contains the near-end embedded reinforcing steel bars.
In the step (2b), the end part of the steel bar in the precast concrete bridge deck is provided with a sleeve, the two ends of the embedded steel bar are provided with external threads matched with the internal threads of the sleeve, and the side edges of the adjacent precast concrete bridge deck are connected through the embedded steel bar.
Has the advantages that: (1) according to the invention, the high-precision prefabricated mould is adopted to ensure the control of the prefabrication precision of the bridge deck, and the alignment precision of the precast concrete bridge deck and the steel beam is quickly and effectively realized through the setting of the superposition positioning datum, the control method of the superposition precision and the deformation control method, so that the connection precision of the mechanical connecting sleeve of the bridge deck is realized. (2) The invention adopts the steel-concrete composite beam for prefabricating the concrete bridge deck, the concrete bridge deck is prefabricated in a factory, and then the prefabricated steel-concrete composite beam and the steel beam are welded together and cast in situ to form a whole through a wet joint, and the bridge deck prefabrication and the steel beam superposition of the composite beam can be completely standardized construction in the factory, thereby being beneficial to improving the construction quality and shortening the construction period; (3) according to the invention, the alignment base line of the precast concrete bridge deck and the steel beam is utilized, so that the alignment precision of the precast concrete bridge deck and the steel beam is quickly and effectively realized; (4) the steel bars in the wet joints between the precast concrete bridge deck plates are connected in an embedding manner, and the joints are sleeve type primary mechanical connecting joints, so that the connecting mode avoids the traditional steel bar lap welding, solves the problem of mechanical property reduction caused by heating of the steel bars, particularly the brittle fracture problem, and is beneficial to improving the construction quality of the wet joints; (5) according to the invention, through reasonable steel bar connection sequence and bridge deck and steel beam welding sequence, the connection precision and quality of the steel bars are effectively ensured, the matching precision with the steel beams is also ensured, and the practicability is strong; (6) the invention can realize the accurate matching of the steel bar sleeve mechanical connection type concrete precast concrete bridge deck and the steel beam, has high construction efficiency, is suitable for large-scale and standardized production of factories, and has remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic view of the overall structure of the prefabricated mold of the present invention;
FIG. 2 is a cross-sectional view of a preformed mold of the present invention;
FIG. 3 is a schematic view showing the effect of the base and the bottom mold structure of the present invention;
FIG. 4 is a top view of the bottom die structure of the present invention;
FIG. 5 is a top view of the preformed mold of the present invention;
FIG. 6 is a schematic side view of the prefabricated mold of the present invention;
FIG. 7 is a schematic view of a core mold structure of the prefabricated mold of the present invention;
fig. 8 is a schematic view of an unsealed mandrel configuration of the present invention;
FIG. 9 is a schematic structural view of a demolding device of the prefabricated mold of the present invention;
FIG. 10 is a schematic view of a bottom mold of the prefabricated mold of the present invention;
FIG. 11 is a schematic view of a bottom mold of the prefabricated mold of the present invention;
FIG. 12 is a schematic structural view of the prefabricated mold of the present invention before the side mold and the core mold are assembled;
FIG. 13 is a schematic view of the construction of the prefabricated mold of the present invention in combination;
FIG. 14 is a schematic view of a part of the prefabricated form of the present invention being separated from a prefabricated concrete deck slab;
FIG. 15 is a schematic view of the overall structure of the prefabricated mold and the prefabricated concrete deck slab according to the present invention;
FIG. 16 is a schematic view of a multi-section continuous matching assembly structure of a steel beam according to the present invention;
FIG. 17 is a top view of a multi-section continuous matching assembly structure of a steel beam according to the present invention;
FIG. 18 is a schematic diagram of the layout of the overlay datum line of the precast concrete deck slab;
FIG. 19 is a schematic diagram of the layout of the overlay datum line of the precast concrete deck slab;
FIG. 20 is a schematic view showing a mechanical connection structure of the reinforcing bars and the sleeves between the precast concrete deck slabs;
FIG. 21 is a schematic view of the butt welding of the pre-buried steel members of the precast concrete deck and the steel beams;
FIG. 22 is a schematic view showing alignment of precast concrete deck slab and steel girder;
FIG. 23 is a schematic view of a splice plate strong restraint and reinforcement mechanical connection structure between transverse wet welds of a precast concrete deck slab;
fig. 24 is a schematic diagram of factory wet joint pouring of precast concrete deck slab.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a high-precision superposition method of a precast concrete bridge deck and a steel beam of a steel-concrete composite beam, which comprises the following steps of:
the first step is as follows: preparing a precast concrete bridge deck: and (4) preparing the precast concrete bridge deck by adopting a precast mould.
As shown in fig. 1, the prefabricated mold for preparing a precast concrete deck slab according to the present invention, as shown in fig. 1 and 2, includes a base 1, a bottom mold 2 positioned on an upper layer of the base 1, a side mold 3 positioned around the bottom mold 2, a demolding device 4 positioned outside the side mold, and a core mold 5 positioned inside the side mold.
As shown in fig. 3 and 4, the base 1 is composed of a plurality of longitudinal beams parallel to each other and a plurality of cross beams parallel to each other, and the longitudinal beams and the cross beams are vertically arranged so that the longitudinal beams 11 and the cross beams 12 are staggered to form a net-shaped supporting bottom die 2; base 1 upper strata is provided with die block 2, die block 2 comprises first die block 21 and the second die block 22 that is located first die block 21 upper strata, first die block 21 is provided with interval parallel distribution, two recesses 211 for the pre-buried component location of T shape, second die block 22 is provided with the notch 221 that is used for the pre-buried component of T shape to pass that communicates with recess 211, according to the requirement that the built-in fitting was laid, the width of notch 221 is greater than the width of recess 211, notch 211 divide into three die block module that is parallel to each other with the die block jointly with recess 211.
After the precast concrete deck slab is finished, the precast concrete deck slab needs to be separated from the bottom die, so that the base 1 is also divided into three base modules matched with the bottom die module.
As shown in fig. 5, a bottom mold 2 of the present invention is provided with a plurality of first vent holes 23 distributed at intervals, a side mold 3 is provided at the periphery of the bottom mold 2, a demolding device 4 is provided outside the side mold 3, the demolding device 4 is used for separating the side mold 3 from the precast concrete deck slab, as shown in fig. 9, the demolding device 4 is composed of a slide rail 41 fixed at the edge of the second bottom mold 22 and a screw rod 42 slidably connected with the slide rail 41, one end of the screw rod 42 is fixed at the side of the side mold 3, and when in use, the screw rod 42 slides along the slide rail 41 to separate the side mold 3 from the precast concrete deck slab.
As shown in fig. 6, the side form 3 is provided with a first positioning hole 31 and a second through hole 32 for positioning the vertical rib.
As shown in fig. 7 and 8, a plurality of core molds 5 are fixed on the inner side of the side mold 3 of the present invention, the core molds 5 are hollow structures formed by dovetail joints, a plurality of second positioning holes 51 for positioning vertical ribs are arranged on the side where the core molds 5 are fixed with the side mold 3 and the side corresponding to the side, a plurality of positioning grooves 52 for positioning horizontal ribs are arranged on the two sides perpendicular to the side mold 3, and the second positioning holes 51 are matched with the first positioning holes 31 on the side mold 3 to complete the positioning of the vertical ribs together.
After the precast concrete bridge deck is finished, in order to completely separate the precast concrete bridge deck from the device, a plurality of lifting devices 6 are uniformly distributed below the base 1, and the distribution direction is the same as that of the groove 211.
The method for preparing the precast concrete bridge deck by using the precast mould comprises the following steps:
a cross beam 12 and longitudinal beam 11 system is formed by I-shaped steel and channel steel, a foundation pit 13 is arranged below a base 1, the height of the foundation pit is about 1.2m, and bolts can be conveniently screwed. Before the prefabricated mould is assembled, the I-shaped cross beam of the base 1 is bolted with the ground embedded plate, and the overall flatness of the base 1 is adjusted through bolts.
For the positioning assembly of the T-shaped embedded member, the connecting part of the base 1 and the bottom die 2 is divided into three parts, the three parts comprise a middle base and side bases located on two sides of the middle base, the bottom die is also divided into a middle bottom die located above the middle base and side bottom dies located on two sides of the middle bottom die, and the base 1 and the bottom die 2 are welded into a whole.
As shown in fig. 11, the first bottom die 21 and the second bottom die 22 constituting the bottom die 2 are made of two layers of 12mm steel plates, and are provided with grooves for embedding T-shaped embedded members for positioning the embedded plates and the T-shaped embedded members, and also, according to actual conditions, tooth block notches are provided on the bottom die, and prestressed toothed plates 25 are directly formed during concrete pouring; as shown in fig. 10, the variable cross-section positions of the prefabricated plates on the two sides are realized by bending the steel plates, the bottom die 2 is provided with first vent holes 23 at the prefabricated plate positions at intervals of 2m, the embedded steel plates correspond to the assembly positions, and two parallel grooves 211 convenient for the T-shaped webs to penetrate are arranged, so that the upper surfaces of the embedded members are flush with the upper surface of the bottom die. In order to ensure accurate positioning of the T-shaped embedded members 24, the second bottom die 22 is broken into three parts at the T-shaped embedded part position, and is positioned according to the embedded part interval to form the notches 221. The stripper cylinder is then installed as a lifting device 6.
As shown in fig. 12, the side forms 3 are provided with first positioning holes 31, the core forms 5 are provided with second positioning holes 51 for positioning the reinforcing bars, the core forms 5 are split hollow core forms at the dovetail groove portions, and positioning grooves 52 for accommodating the reinforcing bars are provided, so that the positioning grooves 52 in the core forms 5 are sealed by a sealant for preventing slurry leakage. When the side forms 3 are positioned, the side forms 3 are pushed to the mounting positions by the lead screws 42, the side forms 3 and the bottom die 2 are tightly pressed by the slide rails 41 of the demoulding device 4 and then fixed by the pins, and the side forms 3 are fixed by the loose joint bolts. After installing the vent plug and the reinforcing mesh, the core mold 5 is assembled.
As shown in fig. 13, when assembling the reinforcing bar net, the reinforcing bar is first inserted into the threaded sleeve, and the threaded pull rod is inserted into the outer side of the side form 3 and connected to the other end of the threaded sleeve through the first positioning hole 31, so as to position the reinforcing bar. And a threaded pull rod penetrates into the outer side of the core mold, and a second through hole 32 of the side mold 3 penetrates into a second core mold positioning hole 51 to be connected with the other end of the steel bar threaded sleeve, so that the steel bar positioning is realized.
As shown in fig. 14, the removal of the mold is performed in the order of the side mold 3, the core mold 5, and the bottom mold 2.
First, all the threaded tie rods between the sideform 3, the core form 5, and the mesh reinforcement are removed, the sideform 3 is pulled out along the slide rails 41 by the lead screw 42 of the knockout 4, and the core form 5 is taken out by the crow bar.
And (3) removing the connecting bolt of the bottom die 2 for fixing the T-shaped embedded part, removing the hole plug of the first vent hole 23, starting the lifting device 6 to demould the hydraulic cylinder, and jacking the precast concrete deck and the middle bottom die together.
Adding cushion blocks between the precast bridge deck slab and the bottom moulds at the two sides, starting the lifting device 6 to demould the hydraulic cylinder, and putting down the precast bridge deck slab, wherein the cushion blocks are arranged between the precast concrete bridge deck slab and the bottom moulds at the two sides, and the precast concrete bridge deck slab can be separated from the bottom mould at the middle part due to the fact that the cushion blocks are continuously put down, so that the precast concrete bridge deck slab is manufactured, as shown in fig. 15.
The second step is that: and setting a superposition positioning reference.
As shown in fig. 16-19, when the composite beam is assembled, the pure steel beam segments 8 are sequentially manufactured on the assembly jig frame according to the manufacturing line shape, and then the longitudinal base line 81 of the overlapped alignment line segment of the precast concrete deck 7 and the horizontal base line 82 of the segment arranged at the center of the steel beam segment 8 are precisely released on the steel beam by using the paired measuring towers 83 at the two ends of the assembly jig frame to be used as the longitudinal and horizontal positioning reference for overlapping the precast concrete deck.
The third step: and overlapping the precast concrete bridge deck with the steel beam.
As shown in fig. 20, the precast concrete deck slab is provided with a near-end caulking reinforcing bar 71, both ends of the caulking reinforcing bar are provided with external threads matched with the internal threads of the sleeve, and the caulking reinforcing bar connects the side edges of the adjacent precast concrete deck slab by connecting the sleeve 72 at the end of the reinforcing bar arranged in the precast concrete deck slab.
As shown in fig. 21 and 22, when the precast concrete deck slab is superposed with the steel beam, the precast concrete deck slab is in place with reference lines laid on the steel beam and the pre-embedded steel members of the precast concrete deck slab as the reference lines, and fine adjustment is performed by using the jack and the support adjusting device installed on the partition plate, so that the following positions are in one-to-one correspondence:
firstly, a T-shaped embedded part of a precast concrete bridge deck is in butt joint with a partition plate of a steel beam segment 8 to form a partition plate butt joint welding seam 84, and single plates embedded around the precast concrete bridge deck are in butt joint with flange plates of an outer web to form an edge butt joint welding seam 85;
secondly, the transverse base line 77 of the precast concrete bridge deck is parallel to the transverse base line 82 of the steel beam segment, the distance between the transverse base lines is a fixed value determined through a measured value, the longitudinal base line 76 of the precast concrete bridge deck is parallel to the longitudinal base line 81 of the segment, and the distance between the longitudinal base lines is a fixed value determined through a measured value;
and thirdly, the peripheral steel bars of the adjacent precast concrete bridge deck plates 7 are in one-to-one correspondence, the two ends of the embedded steel bars are respectively connected with the steel bar sleeves at the end parts of the adjacent precast concrete bridge deck plates, the connection of the adjacent precast concrete bridge deck plates is realized, and the connection quality meets the quality requirement of a first-level steel bar joint.
As shown in fig. 23, before the precast concrete deck slab embedded parts and the steel beams are welded and before the wet joints of the factory are poured, when the precast concrete deck slab is in place, the wet joints are strongly restrained and connected: at the transverse wet joints, the splice plates 74 are used to constrain adjacent precast concrete deck panels, ensuring that welding and concrete shrinkage have little effect on the relative position of the precast concrete deck panels.
Finally, as shown in fig. 24, the butt welds between the precast concrete deck slab and the steel beam partition plate and the butt welds between the peripheral embedded steel plates are welded, and finally, the concrete of the transverse wet weld 75 and the longitudinal wet weld 73 is poured, thereby completing the overlapping construction of the concrete deck slab.
The steel bar between the wet joints of the steel-concrete composite bridge adopts a high-precision superposition manufacturing technology of a precast concrete bridge deck and a steel beam of a mechanical connecting joint. According to the technology, the precision control of the precast concrete bridge deck is guaranteed by adopting the high-precision precast mould, the control method of the connection precision of the precast concrete bridge deck and the steel beam and the steel bar, the reasonable welding sequence and the deformation control methods of the process splice plate and the like are realized by setting the base line positioning reference, the alignment precision of the precast concrete bridge deck and the steel beam is quickly and effectively realized, and the connection precision of the mechanical connection sleeve of the bridge deck is realized.
The invention has high construction efficiency, is suitable for large-scale and standardized production of factories, and effectively reduces the construction cost.
Claims (5)
1. A high-precision superposition method for a precast concrete bridge deck and a steel beam of a steel-concrete composite beam is characterized by comprising the following steps of:
(1a) preparing a precast concrete bridge deck: preparing a precast concrete bridge deck by adopting a precast mould; the preparation of the precast concrete bridge deck comprises the following steps:
(2a) sequentially installing a square base, a bottom die positioned on the upper layer of the base and side dies positioned on the upper layer of the bottom die and distributed along the periphery of the edge of the bottom die, forming a space for accommodating a precast concrete deck slab between the side dies and the bottom die, and arranging a groove for positioning a T-shaped embedded part and an embedded plate on the bottom die; the side die is provided with a plurality of first positioning holes for positioning the reinforcing steel bars, the outer side of the side die is provided with a plurality of demoulding devices distributed at intervals, the inner side of the side die is provided with a plurality of core dies for positioning the reinforcing steel bars, the core dies are provided with a plurality of second positioning holes for positioning the vertical reinforcing steel bars and a plurality of positioning grooves for positioning the transverse reinforcing steel bars, and the second positioning holes are matched with the first positioning holes; the lower layer of the base is provided with a plurality of lifting devices for lifting the bottom die;
(2b) positioning the T-shaped embedded part and the embedded plate by utilizing a groove arranged on the bottom die, positioning the transverse ribs and the vertical ribs by utilizing a first positioning hole arranged on the side die and a second positioning hole arranged on the core die together, laying a reinforcing mesh required in the precast concrete bridge deck, casting concrete, and manufacturing the precast concrete bridge deck;
(2c) after the precast slab is finished, removing the core mould, then removing the side mould by using a demoulding device, and finishing demoulding of the bottom mould by using a lifting device to finish the manufacturing of the precast concrete deck slab;
(1b) setting a superposition positioning reference: when the combined beam is assembled in a total mode, firstly, manufacturing of pure steel beam parts is sequentially completed on a total assembling jig frame according to the manufacturing line shape, and then segment longitudinal baselines and segment transverse baselines which are accurately released on steel beams by using paired measuring towers at two ends of the total assembling jig frame and are positioned and assembled by precast concrete bridge deck plates are used as longitudinal and transverse positioning benchmarks for precast concrete bridge deck plate superposition;
(1c) precast concrete decking and girder steel coincide: the method comprises the steps that a precast concrete deck slab is positioned by taking a reference line arranged on a steel beam and a precast steel member of the precast concrete deck slab as a reference, and the precast concrete deck slab is finely adjusted, so that a steel bar joint at a wet joint of adjacent precast concrete deck slabs is accurately aligned and mechanically connected;
(1d) before the precast concrete bridge deck embedded part and the steel beam are welded and before a wet joint of a factory is poured, strong constraint connection is carried out on the wet joint;
(1e) and welding the butt-joint welding seams between the precast concrete bridge deck and the steel beam partition plate and the butt-joint welding seams between the precast concrete bridge deck and the peripheral embedded steel plates, and finally pouring the wet joint concrete of the factory to finish the superposition construction of the concrete bridge deck.
2. The method for high-precision superposition of the precast concrete deck slab and the steel beam of the steel-concrete composite beam according to claim 1, wherein the bottom die comprises a first bottom die and a second bottom die positioned on the upper layer of the first bottom die; the first bottom die is provided with grooves which are distributed in parallel at intervals and used for positioning the T-shaped embedded members; the second bottom die is provided with notches which are distributed at intervals in parallel and communicated with the grooves and used for the T-shaped embedded members to penetrate through.
3. The method for high-precision superposition of the precast concrete deck slab and the steel beam of the steel-concrete composite beam as claimed in claim 2, wherein the demoulding device comprises a slide rail fixed on the edge of the bottom mould and a screw rod with one end fixed on the side mould.
4. The method for high-precision superposition of the precast concrete deck slab and the steel beam of the steel-concrete composite beam as claimed in claim 1, wherein in the step (1c), when the precast concrete deck slab is in place, the side edges of the precast concrete deck slab contain the embedded reinforcing steel bars.
5. The method for overlapping the precast concrete deck slab and the steel beam with high precision of the steel-concrete composite beam as claimed in claim 4, wherein the ends of the steel bars in the precast concrete deck slab are provided with sleeves, the two ends of the embedded steel bars are provided with external threads matched with the internal threads of the sleeves, and the side edges of the adjacent precast concrete deck slab are connected through the embedded steel bars.
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| CN111236067B (en) * | 2020-02-27 | 2021-06-11 | 东南大学 | Prefabricated assembled steel bridge deck pavement structure and implementation method thereof |
| CN111485490A (en) * | 2020-04-09 | 2020-08-04 | 苏交科集团股份有限公司 | Wide prefabricated bridge deck and construction method thereof |
| CN113174860A (en) * | 2021-04-28 | 2021-07-27 | 中交路桥建设有限公司 | Positioning method for mounting steel box girder bridge |
| CN114000429A (en) * | 2021-08-07 | 2022-02-01 | 中铁宝桥（扬州）有限公司 | Longitudinal wet joint pouring deformation control method for eccentric half-width steel-concrete combined box girder |
| CN114086459B (en) * | 2021-08-20 | 2024-09-24 | 中交一公局集团有限公司 | Steel-concrete composite beam structure and construction method |
| CN114197307B (en) * | 2021-12-31 | 2024-07-23 | 山东省交通规划设计院集团有限公司 | Prefabricated bridge deck, cable-stayed bridge and construction method thereof |
| CN114589792B (en) * | 2022-04-02 | 2023-09-22 | 中铁宝桥（扬州）有限公司 | Bridge prefabricated plate mould |
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