CN115094745A - Cast-in-situ integral steel-concrete composite beam - Google Patents
Cast-in-situ integral steel-concrete composite beam Download PDFInfo
- Publication number
- CN115094745A CN115094745A CN202210725857.4A CN202210725857A CN115094745A CN 115094745 A CN115094745 A CN 115094745A CN 202210725857 A CN202210725857 A CN 202210725857A CN 115094745 A CN115094745 A CN 115094745A
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- Prior art keywords
- steel
- cast
- pouring
- concrete
- shear key
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- 239000004567 concrete Substances 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000011178 precast concrete Substances 0.000 claims description 20
- 238000005452 bending Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- E01D19/00—Structural or constructional details of bridges
-
- 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
-
- 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
- E01D2101/268—Composite concrete-metal
Abstract
The invention discloses a cast-in-situ integral steel-concrete composite beam, which comprises a steel beam and a prefabricated concrete bridge and road slab, wherein the top of the steel beam is provided with a pouring groove, and the bottom of the prefabricated concrete bridge and road slab is fixedly connected with the steel beam through a pouring material cast in the pouring groove.
Description
Technical Field
The invention belongs to the field of building structures and bridge engineering, and particularly relates to a cast-in-situ integral type steel-concrete composite beam.
Background
The steel-concrete combined structure fully utilizes the characteristics of concrete and steel structure materials, combines the advantages of tensile strength and compressive strength, and has more and more application reasons on bridges; because the characteristics of the steel structure and the concrete material are different, how to simply, conveniently and quickly connect the steel structure and the concrete material and ensure the long-term reliable performance of the steel structure and the concrete material is a problem which is always explored and solved in the engineering industry.
In the prior art, two structures are generally adopted, one structure is that a bridge deck is assembled on a steel beam through a preset component to form a composite structure, the structural method does not need the workload of drilling on site, but needs some reserved holes, seams and the like to cast in situ on site, the long-term performance is difficult to guarantee, and the combination degree of the assembly mode is not satisfactory; the other method is that shear keys are arranged on the joint surface of the steel beam along the longitudinal direction, the bridge deck is provided with shear steel bars, and a steel-concrete combined bridge structure is formed by the cast-in-place concrete bridge deck, so that the structure has better combination performance, but the structures of the shear keys and the steel bars of the concrete in the cast-in-place joint area are complex, and the compactness of the regional concrete is difficult to ensure; the micro defects gradually develop into macro cracks under the action of long-term impact and fatigue load, so that the force transmission performance of the micro cracks is gradually degraded, and the bridge has potential safety hazards of difficult inspection and maintenance.
Therefore, a connection structure of a steel concrete composite bridge formed by a precast concrete plate and a steel structure is needed, the structure of a shear key in a connection area is simple, the quality of cast-in-place concrete in the later period is not influenced, the construction process can be obviously simplified, the construction period is shortened, and the strength of the whole composite bridge can be ensured; therefore, the bridge is convenient to construct, safe to use and easy to maintain, and has remarkable technical, economic and social comprehensive benefits.
Disclosure of Invention
In view of the above, the invention aims to provide a cast-in-place integral type steel-concrete composite beam, which has a simple structure of a shear key in a combination area, does not influence the quality of cast-in-place concrete in the later period, can obviously simplify the construction process, shorten the construction period and ensure the strength of the integral composite beam; therefore, the bridge is convenient to construct, safe to use and easy to maintain, and has remarkable technical, economic and social comprehensive benefits.
The cast-in-situ integral steel-concrete composite beam comprises a steel beam and a prefabricated concrete bridge deck, wherein a pouring groove is formed in the top of the steel beam, and the bottom of the prefabricated concrete bridge deck is fixedly connected with the steel beam through a pouring material cast in the pouring groove.
Further, the cross section of the pouring groove is a trapezoidal groove.
Furthermore, a shear key is arranged at the bottom of the precast concrete bridge deck and extends downwards into the pouring groove.
Furthermore, the shear key is formed by shear steel bars poured in the precast concrete bridge deck.
Furthermore, the transverse shape of the shear key is a trapezoidal shear key formed by bending shear steel bars.
Further, the top edge of the trapezoidal shear key is poured on the precast concrete bridge deck, and the bottom edge of the trapezoidal shear key is poured on the pouring groove;
and at least one pouring hole for cast-in-place is reserved on the prefabricated bridge road plate.
Further, the bottom edge of the trapezoidal shear key is larger than an upper opening of the pouring groove, and the precast concrete bridge deck is precast in longitudinal sections; before pouring, the trapezoidal shear key is embedded into the pouring groove from the end part of the pouring groove, the prefabricated concrete bridge deck is pushed along the longitudinal direction to be in place at the top of the steel beam, and then pouring is carried out.
Further, the pouring material is special concrete.
Furthermore, the steel beam is an I-shaped steel beam, the pouring groove is formed by two steel plates welded on a top plate of the I-shaped steel beam, and an antifriction layer convenient for the prefabricated concrete bridge road slab to push is formed at the top end of each steel plate.
The invention has the beneficial effects that: according to the cast-in-place integral steel-concrete composite beam, the pouring space is formed by the pouring groove, the prefabricated concrete bridge deck and the steel beam are combined through the pouring materials, the special pouring space is arranged, the pouring materials poured later can ensure the pouring quality due to the fact that the complex shear keys and the influence of shear steel bars are removed, the shear key structure in the combination area in the composite structure is formed by the pouring groove, the construction process can be obviously simplified, the construction period is shortened, the strength of the integral composite beam can be ensured, and therefore the bridge is convenient to construct, safe to use and easy to maintain and has obvious technical, economic and social comprehensive benefits.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is an enlarged view of fig. 2 at a.
Detailed Description
As shown in the figure, the cast-in-situ integral steel-concrete composite beam adopted in the embodiment comprises a steel beam 2 and a precast concrete bridge deck 1, wherein a pouring groove 201 is formed in the top of the steel beam 2, and the bottom of the precast concrete bridge deck 1 is fixedly connected with the steel beam 2 through a pouring material cast in the pouring groove; as shown in the figure, the pouring groove is formed by two steel plates which are fixedly arranged (generally welded) along the longitudinal direction on the top surface of the steel beam, the precast concrete bridge deck is supported at the top of the pouring groove and covers the opening of the pouring groove, and the steel beam is fixedly combined with the precast concrete bridge deck after pouring materials are poured inside; in the structure, the two side plates and the prefabricated concrete bridge road plate are directly poured and fixed, the shearing action is directly played, the formed pouring groove has no complex shear key interference in the pouring process, and the pouring is favorable for ensuring the compactness of a pouring material, so that the pouring quality is ensured, and the connection strength is finally ensured.
In this embodiment, the cross section of the casting groove 201 is a trapezoidal trapezoid groove, and the trapezoidal groove forms a trapezoidal casting body after casting the casting material, so that the casting material has a better anti-pulling effect while shearing, and the bonding strength of the composite structure is further ensured.
In the embodiment, the bottom of the precast concrete bridge deck 1 is provided with a plurality of shear keys 3, and as shown in the figure, the shear keys are distributed along the longitudinal direction; the shear key 3 extends downwards into the pouring groove 201, so that the shear resisting effect is further enhanced, although the shear key is provided, the shear key still occupies a smaller space compared with a shear structure with shear resisting at the upper part and the lower part in the prior art, and the pouring of pouring materials cannot be greatly interfered; the shear key 3 can adopt a structure that the steel bars directly extend out, and can also be a pre-embedded shear nail and the like, which is not described in detail herein.
In this embodiment, the shear key 3 is formed by the shear steel bars poured into the precast concrete bridge deck, and is directly formed by the steel bars in the precast concrete bridge deck 1, so that no additional shear structure is required, and the manufacturing process of the precast concrete bridge deck is simplified.
In the embodiment, the transverse shape of the shear key 3 is a trapezoidal shear key formed by bending a shear steel bar, the trapezoidal shear key is matched with the trapezoidal pouring groove to form a trapezoidal pouring body after pouring, and a better anti-pulling effect is realized by utilizing a wedge-shaped structure formed between the trapezoidal shear key and the trapezoidal pouring groove; meanwhile, the trapezoidal shear key enables the space in the pouring groove to be smooth, the compactness of the pouring material during pouring is guaranteed, and the connection strength is guaranteed.
In this embodiment, the top edge of the trapezoidal shear key is poured on the precast concrete bridge deck 1, and the bottom edge is poured on the pouring groove 201, so as to form a good connection structure with high strength.
In this embodiment, the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove 201, and the precast concrete bridge deck 1 is precast in longitudinal sections; before pouring, embedding the trapezoidal shear key into the pouring groove from the end part of the pouring groove 201, pushing the prefabricated concrete bridge road plate along the longitudinal direction to be in place at the top of the steel beam, and pouring; in the structure, because the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove, the prefabricated concrete bridge and road plate cannot be in place from the upper part and only enters from the end part in a pushing manner, and the length of the prefabricated concrete bridge and road plate is not too long so as to avoid increasing the construction difficulty; the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove, so that the connection strength of the trapezoidal shear key and the pouring groove is further improved; certainly, the bottom edge of the trapezoidal shear key can also be smaller than the upper opening of the pouring groove, the trapezoidal shear key can be lifted from the upper part and can be placed in place, and the poured body of the poured wedge-shaped structure still has good connection strength, but the strength performance is slightly poor compared with the structure.
In this embodiment, the casting material is a special concrete, which is referred to as a high-strength concrete in the present invention, and the strength grade of the hardened concrete is not lower than that of C60, and the physical mechanical properties and tensile strength of the high-strength concrete are ensured by mainly using a high-efficiency water reducing agent or adding a certain amount of active mineral admixture at the same time, so as to ensure the overall strength of the composite structural beam, which is not described herein again.
In this embodiment, the steel beam 2 is an i-beam; as shown in the figure, according to the width of the composite beam, a structure of a plurality of transverse parallel I-shaped beams can be adopted; the pouring trough is formed by two steel plates 202 and 203 welded on a top plate of an I-shaped steel beam, an anti-friction layer 4 convenient for the prefabricated concrete bridge deck 1 to push is formed on the top ends of the steel plates 202 and 203, and anti-friction is generally realized by adopting a non-metal material layer with certain bearing capacity, such as a polytetrafluoroethylene layer, and can be bonded and riveted at the top end part of the steel plate, so that the friction force in the pushing process is reduced, and meanwhile, a better sealing effect is realized when concrete is cast in place, and the repeated description is omitted.
Certainly, in order to guarantee to realize pouring, should reserve at least one on the precast concrete bridge road plate 1 and pour hole 101 and be used for pouring the material of pouring, simultaneously, still can be equipped with the bin outlet, and is similar with pouring the pore structure for pour the in-process row material, with the closely knit degree of guaranteeing to pour, no longer describe herein.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A cast-in-situ integral steel-concrete composite beam is characterized in that: the prefabricated concrete bridge and road slab comprises a steel beam and a prefabricated concrete bridge and road slab, wherein a pouring groove is formed in the top of the steel beam, and the bottom of the prefabricated concrete bridge and road slab is fixedly connected with the steel beam through pouring materials cast in the pouring groove in a cast-in-place mode.
2. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 1, wherein: the cross section of the pouring groove is a trapezoidal trapezoid groove.
3. The cast-in-situ integral type steel-concrete composite beam of claim 2, characterized in that: and a shear key is arranged at the bottom of the precast concrete bridge deck and extends downwards into the pouring groove.
4. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 3, wherein: the shear key is formed by shear steel bars poured in the precast concrete bridge deck.
5. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 4, wherein: the transverse shape of the shear key is a trapezoidal shear key formed by bending shear steel bars.
6. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 1, wherein: the top edge of the trapezoid shear key is poured in the precast concrete bridge deck, and the bottom edge of the trapezoid shear key is poured in the pouring groove;
and at least one pouring hole for cast-in-place is reserved on the prefabricated bridge road plate.
7. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 6, wherein: the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove, and the precast concrete bridge deck is precast in longitudinal sections; before pouring, the trapezoid shear key is embedded into the pouring groove from the end part of the pouring groove, and the prefabricated concrete bridge deck is longitudinally pushed to be in place at the top of the steel beam and then poured.
8. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 4, wherein: the pouring material is special concrete.
9. The cast-in-situ integrated steel-concrete composite beam as claimed in claim 4, wherein: the steel beam is an I-shaped steel beam, the pouring groove is formed by two steel plates welded on a top plate of the I-shaped steel beam, and an antifriction layer convenient for the prefabricated concrete bridge road plate to push is formed at the top end of each steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725857.4A CN115094745A (en) | 2022-06-24 | 2022-06-24 | Cast-in-situ integral steel-concrete composite beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725857.4A CN115094745A (en) | 2022-06-24 | 2022-06-24 | Cast-in-situ integral steel-concrete composite beam |
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| Publication Number | Publication Date |
|---|---|
| CN115094745A true CN115094745A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210725857.4A Pending CN115094745A (en) | 2022-06-24 | 2022-06-24 | Cast-in-situ integral steel-concrete composite beam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007169886A (en) * | 2005-12-19 | 2007-07-05 | Sho Bond Constr Co Ltd | Composite structure of main girder and precast floor slab |
| CN105133492A (en) * | 2015-09-24 | 2015-12-09 | 中交第二航务工程局有限公司 | Novel concrete bridge deck with channels at bottom |
| CN209412616U (en) * | 2018-12-18 | 2019-09-20 | 中铁第四勘察设计院集团有限公司 | Group frame type connection reinforcing structure between sleeper block and railway roadbed |
| CN114059440A (en) * | 2021-11-22 | 2022-02-18 | 深圳大学 | Fully-assembled SBSG shear connection steel-concrete composite beam |
| CN114197324A (en) * | 2022-01-12 | 2022-03-18 | 深圳大学 | Steel concrete connecting piece suitable for industrial manufacturing and assembling and construction method of combined beam |
| CN218813186U (en) * | 2022-06-24 | 2023-04-07 | 中冶建工集团有限公司 | Cast-in-situ connecting structure of steel-concrete composite beam |
-
2022
- 2022-06-24 CN CN202210725857.4A patent/CN115094745A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007169886A (en) * | 2005-12-19 | 2007-07-05 | Sho Bond Constr Co Ltd | Composite structure of main girder and precast floor slab |
| CN105133492A (en) * | 2015-09-24 | 2015-12-09 | 中交第二航务工程局有限公司 | Novel concrete bridge deck with channels at bottom |
| CN209412616U (en) * | 2018-12-18 | 2019-09-20 | 中铁第四勘察设计院集团有限公司 | Group frame type connection reinforcing structure between sleeper block and railway roadbed |
| CN114059440A (en) * | 2021-11-22 | 2022-02-18 | 深圳大学 | Fully-assembled SBSG shear connection steel-concrete composite beam |
| CN114197324A (en) * | 2022-01-12 | 2022-03-18 | 深圳大学 | Steel concrete connecting piece suitable for industrial manufacturing and assembling and construction method of combined beam |
| CN218813186U (en) * | 2022-06-24 | 2023-04-07 | 中冶建工集团有限公司 | Cast-in-situ connecting structure of steel-concrete composite beam |
Non-Patent Citations (1)
| Title |
|---|
| 王肇民: "建筑钢结构设计", 28 February 2001, 同济大学出版社, pages: 145 * |
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