CN113463495A - Construction method of cast-in-situ steel-concrete composite beam with double main beam longitudinal one-way plates - Google Patents
Construction method of cast-in-situ steel-concrete composite beam with double main beam longitudinal one-way plates Download PDFInfo
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- CN113463495A CN113463495A CN202110826560.2A CN202110826560A CN113463495A CN 113463495 A CN113463495 A CN 113463495A CN 202110826560 A CN202110826560 A CN 202110826560A CN 113463495 A CN113463495 A CN 113463495A
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- 239000004567 concrete Substances 0.000 title claims abstract description 63
- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 183
- 239000010959 steel Substances 0.000 claims abstract description 183
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 8
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
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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
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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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Abstract
The construction method of the cast-in-situ reinforced concrete composite beam with the double main beam longitudinal one-way plates comprises the following steps: A. during construction, firstly erecting a steel structure cross beam between two I-shaped steel main beams, laying a bottom steel plate between two adjacent steel structure cross beams, and welding PBL shear key small I-shaped steel on the bottom steel plate; B. firstly, penetrating and fixing transverse shear steel bars at the opening positions of the PBL shear key small I-shaped steel webs, and then fixedly erecting longitudinal fixed steel bars on the transverse shear steel bars; welding transverse maintenance reinforcing steel bars at the top edges of the PBL shear key small I-shaped steel, then erecting bridge deck longitudinal stress reinforcing steel bars above the transverse maintenance reinforcing steel bars, and then erecting bridge deck transverse stress reinforcing steel bars on the longitudinal stress reinforcing steel bars; C. after the construction is finished, the pouring sequence on the bottom steel plate is as follows: concrete pouring is carried out on the side pivot area and the mid-span area, and finally concrete pouring is carried out on the mid-span area. The construction method is easy to implement, convenient for subsequent repair, low in cost, stable and reliable in built composite beam.
Description
Technical Field
The invention relates to a bridge engineering technology, in particular to a construction method of a cast-in-place steel-concrete composite beam of a longitudinal one-way plate with double main beams.
Background
In the design of highways and municipal bridges, particularly roads or navigation channels are spanned on the highways, the steel-concrete composite beam structure is more and more widely adopted. The conventional steel-concrete composite beam bridge deck is generally a transverse unidirectional slab, and has the following disadvantages:
1) the number of the steel main beams is determined by the bridge width, the more the number of the lanes is, the more the number of the steel main beams are required to be used for reducing the transverse span of the bridge deck, and therefore the steel consumption of the steel-concrete composite beam is large;
2) when the bridge deck is a transverse one-way plate, in order to ensure the durability of the bridge deck, a transverse prestress is usually required to be set, the construction process is complicated, and the bridge deck needs to be integrally replaced transversely after being damaged in the later period to block traffic;
3) when the bridge deck is cast in place, a concrete template needs to be arranged, so that the construction cost is high;
4) when the bridge deck adopts precast slabs, cast-in-place seams are needed among the precast slabs, and the durability of the cast-in-place seams is poor and is not as good as that of integral casting;
5) the steel structure cross beam is arranged in the middle or at the lower edge of the steel main beam, the steel beam is poor in stability when the concrete and the steel main beam do not form a combined beam section, a temporary member piece is required to be arranged during construction to stiffen the steel main beam, and lateral stability during construction is guaranteed;
6) the crack resistance is ensured by large steel bars in the longitudinal and transverse directions, and the using amount of the steel bars is large.
In view of the existing problems, it is necessary to provide a construction method for a cast-in-place steel-concrete composite beam with a double main beam longitudinal one-way plate, which is easy to implement, convenient for subsequent repair, and the constructed composite beam is low in cost, stable and reliable.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a cast-in-place steel-concrete composite beam with double main beam longitudinal one-way plates, and the construction method has the advantages of easy implementation, convenience for subsequent repair, low cost of the built composite beam, stability and reliability.
The technical scheme of the invention is as follows:
the construction method of the cast-in-situ reinforced concrete composite beam with the double main beam longitudinal one-way plates comprises the following steps:
A. during construction, firstly erecting steel structure cross beams between two I-shaped steel main beams, hoisting a bottom steel plate prefabricated in advance and PBL shear key small I-shaped steel on site, laying the bottom steel plate between two adjacent steel structure cross beams, and equidistantly welding the PBL shear key small I-shaped steel with longitudinally-arranged web plate holes on the bottom steel plate;
B. firstly, penetrating and fixing transverse shear steel bars at the opening positions of the PBL shear key small I-shaped steel webs, and then fixedly erecting longitudinal fixed steel bars on the transverse shear steel bars; welding transverse maintenance reinforcing steel bars at the top edges of the PBL shear key small I-shaped steel bars to ensure the lateral stability of the PBL shear key small I-shaped steel bars before the concrete is solidified, then erecting bridge deck longitudinal stress reinforcing steel bars above the transverse maintenance reinforcing steel bars, and then erecting bridge deck transverse stress reinforcing steel bars on the longitudinal stress reinforcing steel bars;
C. after the construction is finished, concrete pouring is carried out on the bottom steel plate, and the pouring sequence is as follows: concrete pouring is carried out on the side pivot area and the mid-span area, and finally concrete pouring is carried out on the mid-span area.
The construction method of the cast-in-situ steel-concrete composite beam of the longitudinal unidirectional plate with the double main beams, which adopts the technical scheme of the invention, has the following advantages:
1) the construction is easy; the bridge deck slab is a longitudinal unidirectional slab, and prestress does not need to be arranged in the transverse direction, so that the tensioning operation of the transverse prestress in the conventional transverse unidirectional slab composite beam is omitted, and the construction is convenient; due to the arrangement of the steel structure cross beam and the bottom steel plate which is longitudinally provided with the PBL shear key and is stiffened by the I-shaped steel, the lateral stability of the two steel main beams and the steel structure cross beam is good when a concrete slab is not poured during construction, and no additional temporary stiffening is required; meanwhile, the steel concrete composite bridge deck can be integrally cast on site above the stiffened bottom steel plate, so that templates are saved, and construction is rapid;
2) the subsequent repair is convenient; due to the arrangement of the steel structure cross beams, the stability of the bridge is ensured, and if the bridge deck is locally damaged in later operation, the bridge deck can be repaired in half-width by a half-width open-car, so that the bridge deck is convenient to repair;
3) the built composite beam has low cost; the steel concrete composite bridge deck is supported by the steel structure beams, and the double-girder structure is suitable for wider bridges without increasing the number of girders, so that steel can be saved; the bridge deck is a longitudinal one-way plate, and the thickness of the bridge deck is not controlled by the bridge width, so that the steel concrete composite bridge deck is saved; PBL shear key small I-shaped steel is densely distributed above the bottom steel plate, so that the longitudinal crack resistance of the bridge deck can be ensured, and the number of longitudinal steel bars of the bridge deck can be reduced; the PBL shear key is provided with a hole in the I-shaped steel web plate, so that the using amount of transverse steel bars is reduced on the premise of ensuring the shear resistance of the bridge deck;
4) the built composite beam is stable and reliable; because the bridge deck slab is cast in place, the integrity of the bridge deck slab is better, the durability problem of wet joints between prefabricated slabs of the conventional composite beam is avoided, and the bridge is more stable and reliable to use.
Preferably, in the cast-in-place steel-concrete composite beam with the double main beams and the longitudinal unidirectional plates, the bottom steel plate and the PBL shear key small I-shaped steel above the bottom steel plate are welded in a factory and are spliced in a field in a longitudinal and transverse block mode. The fixing is carried out in a welding mode, so that the implementation is convenient, and the connection is reliable; welding is carried out in a factory and splicing is carried out on the spot, so that the construction efficiency is improved.
For optimization, in the cast-in-place steel-concrete composite beam with the double main beam longitudinal unidirectional plates, the longitudinal distance between two adjacent steel structure cross beams is 3-4 m. The longitudinal distance between two adjacent steel structure beams is set to be 3-4m, and the material cost is effectively reduced on the premise of ensuring the supporting strength of the steel structure beams to the steel concrete composite bridge floor.
In the cast-in-place steel-concrete composite beam with the double main beam longitudinal unidirectional plates, the thickness of the bottom steel plate ranges from 2mm to 4mm, and the stress requirement of the concrete under wet weight before solidification is met. The thickness of the bottom steel plate is set in the range, and the material cost is effectively reduced on the premise of ensuring the bearing strength of the bottom steel plate on the steel concrete composite bridge deck.
In the cast-in-place steel-concrete composite beam of the longitudinal unidirectional plate with the double main beams, the range of the transverse distance between the I-shaped steels of the two adjacent PBL shear keys is 13-17cm, so that the stress requirement of stiffening the bottom steel plate under the wet weight before the concrete is not solidified is met. The transverse distance between the small I-shaped steels of the two adjacent PBL shear keys is set in the range, so that the material cost is effectively reduced on the premise of ensuring the shear resistance of the steel concrete composite bridge deck.
Preferably, in the cast-in-place steel-concrete composite beam with the double main beam longitudinal unidirectional plates, the number of the transverse shear steel bars penetrating through each hole of the PBL shear key small I-shaped steel web plate ranges from 2 to 8. When the number of the transverse shear-resistant steel bars ranges from 2 to 8, the transverse shear-resistant capacity can be effectively ensured.
As an optimization, in the cast-in-place steel-concrete composite beam of the longitudinal single-way slab with the double main beams, the number of the longitudinal fixed steel bars fixedly erected on the transverse shear steel bars between each PBL shear key small I-shaped steel is 1-4. When the number of the longitudinal fixed steel bars ranges from 1 to 4, the fixing capacity of the longitudinal fixed steel bars can be effectively ensured.
Preferably, in the cast-in-place steel-concrete composite beam with the double main beams and the longitudinal unidirectional plates, the distance between every two transverse stabilizing steel bars ranges from 10 cm to 20 cm. When the distance between every two transverse dimension-stable steel bars is within the range of 10-20cm, the lateral stability of the PBL shear key small I-shaped steel before the concrete is not solidified can be effectively ensured.
Preferably, in the cast-in-place steel-concrete composite beam with the double main beams and the longitudinal unidirectional plates, the distance between every two longitudinal stress steel bars ranges from 10 cm to 20 cm. When the distance between every two longitudinal stress steel bars is within the range of 10-20cm, the longitudinal stress capability of the steel concrete composite bridge deck can be effectively ensured.
Preferably, in the cast-in-place steel-concrete composite beam with the double main beams and the longitudinal unidirectional plates, the distance between every two transverse stressed steel bars ranges from 10 cm to 20 cm. When the range of the distance between every two transverse stressed steel bars is 10-20cm, the transverse stress capability of the steel concrete composite bridge deck can be effectively ensured.
Drawings
FIG. 1 is a schematic cross-sectional view of a steel structure beam of the composite beam of the present invention;
FIG. 2 is a cross-sectional view of a non-steel structural cross member of the composite beam of the present invention;
FIG. 3 is an enlarged view at block A in FIG. 2;
FIG. 4 is an elevational view of the PBL shear key small I-steel at B in FIG. 3 with respect to the web opening;
FIG. 5 is a top plan view of a portion of the composite beam of the present invention;
the labels in the figures are: 1-i-beam main beam; 2-a steel structure beam; 3-bottom steel plate; 4-PBL shear key small I-shaped steel; 5-transverse shear steel bars; 6-longitudinally fixing the steel bars; 7-transversely maintaining the stable steel bars; 8-longitudinal stressed steel bars; 9-transverse stressed steel bars; 10-steel concrete composite bridge deck.
Detailed Description
The invention is further described in the following detailed description (including examples) with reference to the figures, but not to be construed as limiting the invention.
Example (b):
referring to fig. 1-5, the cast-in-place steel-concrete composite beam with the double-girder longitudinal unidirectional plates comprises i-steel girders 1 on the left side and the right side, steel structure beams 2 are arranged between the i-steel girders 1 on the two sides, a bottom steel plate 3 is arranged between every two adjacent steel structure beams 2, and PBL shear key small i-steel 4 with longitudinally-arranged web openings is fixed on the bottom steel plate 3; transverse shear steel bars 5 penetrate through holes of the PBL shear key small I-shaped steel 4 web plates, the transverse shear steel bars 5 are fixed in the holes of the PBL shear key small I-shaped steel 4 web plates, and longitudinal fixing steel bars 6 are fixedly erected on the transverse shear steel bars 5; transverse maintenance steel bars 7 are fixedly erected on the upper edges of the PBL shear key small I-shaped steels 4, longitudinal stress steel bars 8 are fixedly erected on the transverse maintenance steel bars 7, and transverse stress steel bars 9 are fixedly erected on the longitudinal stress steel bars 8; concrete poured on the bottom steel plate 3 forms a steel concrete composite bridge deck 10, and the PBL shear key small I-shaped steel 4 and the steel bars are located in the steel concrete composite bridge deck 10.
In the embodiment, the longitudinal distance between two adjacent steel structure beams 2 is 3 m; the thickness of the bottom steel plate 3 is 2 mm; the transverse distance between two adjacent PBL shear key small I-shaped steels 4 is 15 cm; the PBL shear key small I-shaped steel 4 is welded above the bottom steel plate 3; the number range of the transverse shear steel bars penetrating through each hole of the PBL shear key small I-shaped steel 4 web is 2; the number range of the longitudinal fixed steel bars 6 fixedly erected on the transverse shear steel bars 5 among the PBL shear key small I-shaped steel 4 is 1; the range of the distance between every two transverse stabilizing steel bars 7 is 15 cm; the range of the distance between each longitudinal stress steel bar 8 is 15 cm; the spacing between each transverse stressed steel bar 9 is in the range of 15 cm.
The construction method of the cast-in-situ reinforced concrete composite beam with the double main beam longitudinal one-way plates comprises the following steps:
A. during construction, firstly, the steel structure cross beams 2 are erected between the two I-shaped steel main beams 1, the prefabricated bottom steel plates 3 and the PBL shear key small I-shaped steel 4 are hoisted on site, the bottom steel plates 3 are laid between the two adjacent steel structure cross beams 2, the PBL shear key small I-shaped steel 4 is spliced on site in a longitudinal and transverse block mode, and the PBL shear key small I-shaped steel 4 is welded above the bottom steel plates 3 at equal intervals in a factory;
B. firstly, penetrating and fixing transverse shear steel bars 5 at the opening positions of the PBL shear key small I-shaped steel 4 webs, and then fixedly erecting longitudinal fixed steel bars 6 on the transverse shear steel bars 5; welding transverse maintenance reinforcing steel bars 7 on the top edges of the PBL shear key small I-shaped steel bars 4 to ensure that the PBL shear key small I-shaped steel bars 4 are laterally stable before concrete is solidified, then building bridge deck longitudinal stress reinforcing steel bars 8 above the transverse maintenance reinforcing steel bars 7, and building bridge deck transverse stress reinforcing steel bars 9 on the longitudinal stress reinforcing steel bars 8;
C. after the construction is finished, concrete pouring is carried out on the bottom steel plate 3, and the pouring sequence is as follows: concrete pouring is carried out on the side pivot area and the mid-span area, and finally concrete pouring is carried out on the mid-span area.
The above general description of the invention and the description of the specific embodiments thereof, as referred to in this application, should not be construed as limiting the technical solutions of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the protection scope of the present application according to the disclosure of the present application without departing from the structural elements of the present invention.
Claims (10)
1. The construction method of the cast-in-situ steel-concrete composite beam with the double main beam longitudinal one-way plates is characterized in that: the method comprises the following steps:
A. during construction, firstly, steel structure cross beams (2) are erected between two I-shaped steel main beams (1), a bottom steel plate (3) is laid between two adjacent steel structure cross beams (2), and PBL shear key small I-shaped steel (4) with web plate holes longitudinally arranged are welded on the bottom steel plate (3) at equal intervals;
B. firstly, transverse shear steel bars (5) penetrate into and are fixed at openings of webs of PBL shear key small I-shaped steel (4), and then longitudinal fixed steel bars (6) are fixedly erected on the transverse shear steel bars (5); welding transverse maintaining and stabilizing steel bars (7) at the top edge of the PBL shear key small I-shaped steel (4) to ensure the lateral stability of the PBL shear key small I-shaped steel (4) before the concrete is not solidified, then erecting bridge deck longitudinal stress steel bars (8) above the transverse maintaining and stabilizing steel bars (7), and then erecting bridge deck transverse stress steel bars (9) on the longitudinal stress steel bars (8);
C. after the building is finished, concrete pouring is carried out on the bottom steel plate (3), and the pouring sequence is as follows: concrete pouring is carried out on the side pivot area and the mid-span area, and finally concrete pouring is carried out on the mid-span area.
2. The construction method of the cast-in-place steel-concrete composite beam with the double main beams and the longitudinal unidirectional plates according to claim 1, is characterized in that: the bottom steel plate (3) and the PBL shear key small I-shaped steel (4) above the bottom steel plate are welded in a factory and are spliced in a vertical and horizontal block mode on site.
3. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the longitudinal distance between two adjacent steel structure beams (2) is 3-4 m.
4. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the thickness range of the bottom steel plate (3) is 2-4mm, and the stress requirement of the concrete under wet weight before solidification is met.
5. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the range of the transverse distance between two adjacent PBL shear key small I-shaped steels (4) is 13-17cm, and the stress requirement of stiffening the bottom steel plate (3) under the wet weight before the concrete is not solidified is met.
6. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the number of the transverse shear steel bars (5) penetrating through each hole of the PBL shear key small I-shaped steel (4) web plate ranges from 2 to 8.
7. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the number of the longitudinal fixed steel bars (6) fixedly erected on the transverse shear steel bars (5) between each PBL shear key small I-shaped steel (4) is 1-4.
8. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the distance between every two transverse dimension-stable reinforcing steel bars (7) ranges from 10 cm to 20 cm.
9. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the distance between each longitudinal stress steel bar (8) ranges from 10 cm to 20 cm.
10. The cast-in-place steel-concrete composite beam of the double-main-beam longitudinal unidirectional plate according to claim 1, characterized in that: the distance between every two transverse stressed steel bars (9) ranges from 10 cm to 20 cm.
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| CN202110826560.2A CN113463495A (en) | 2021-07-21 | 2021-07-21 | Construction method of cast-in-situ steel-concrete composite beam with double main beam longitudinal one-way plates |
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| CN202110826560.2A CN113463495A (en) | 2021-07-21 | 2021-07-21 | Construction method of cast-in-situ steel-concrete composite beam with double main beam longitudinal one-way plates |
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