CN113774781A - Shear part joint composite structure of composite beam bridge and construction method thereof - Google Patents
Shear part joint composite structure of composite beam bridge and construction method thereof Download PDFInfo
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- CN113774781A CN113774781A CN202111046094.2A CN202111046094A CN113774781A CN 113774781 A CN113774781 A CN 113774781A CN 202111046094 A CN202111046094 A CN 202111046094A CN 113774781 A CN113774781 A CN 113774781A
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- 239000002131 composite material Substances 0.000 title claims abstract description 61
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 239000004567 concrete Substances 0.000 claims abstract description 75
- 229910000831 Steel Inorganic materials 0.000 claims description 66
- 239000010959 steel Substances 0.000 claims description 66
- 210000002435 tendon Anatomy 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005728 strengthening 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
- 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 invention discloses a shear part joint composite structure of a composite beam bridge and a construction method thereof. According to the invention, welding operation is not required, all components can be prefabricated in a factory, the on-site construction efficiency can be improved, and the construction quality can be improved; the high-strength bolt simultaneously provides vertical pretightening force and in-plane shear rigidity, and the high-strength bolt and the through reinforcement jointly act to improve the shear resistance of the structure, improve the stress of the joint concrete and be beneficial to enhancing the structural resistance.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a shear part joint composite structure of a combined beam bridge and a construction method thereof.
Background
The steel-concrete composite beam bridge is a novel composite structure form developed by fully utilizing the characteristics of steel and concrete materials, the steel main beam of the steel-concrete composite beam bridge usually adopts a factory prefabricated form, the bridge deck has a construction method of pouring a wet joint or directly casting a bridge deck in situ after prefabricated assembly, and the key of the overall combined work of the steel-concrete composite beam bridge lies in the resistance effect of a shear connector on the relative slippage of the steel and the concrete.
At present, common shear connectors comprise a stud connector, a profile steel connector, a bent rib connector and a PBL connector, wherein the stud connector needs a large amount of welding work, part of studs cannot be prefabricated in a factory due to the limitation of actual construction on the structure, the studs need to be constructed on site, and the quality is difficult to guarantee; the bending rib connecting piece resists shearing force only through the tensile strength of the bending rib, so that the resistance is poor; the resistance of the profile steel connecting piece is larger, but the welding process is complex; the PBL connecting piece is complex in structure and needs to be welded, and the quality is difficult to guarantee.
In the steel-concrete composite structure, for the connection of steel and concrete, after the shear connecting piece is adopted, concrete still needs to be cast in situ in the area containing the connecting piece, namely, the wet joint of a concrete slab. The wet joint is cast in the construction site, so that the quality of the wet joint is poorer than that of a prefabricated part, and the wet joint becomes a key part for controlling the integral resistance of the structure. The design specification GB 50917 and 2013 of the steel-concrete composite beam bridge in China clearly states that measures are adopted to enable prefabricated plates and steel beams to be closely attached to meet the waterproof requirement when the prefabricated reinforced concrete bridge deck is used as a bridge deck, and the design specification JTG/T D6401-2015 of the steel-concrete composite bridge in a highway also states that the contact surface is prevented from being hollow from the aspects of concrete configuration, structural requirements, construction process and the like. Therefore, how to make the joint structure meet the requirements of design, construction and structural durability is a key point of the current steel-concrete composite structure design. The traditional joint structure directly pours concrete in a reserved shear part area, and the problems of complex working procedures, poor concrete quality, low combination performance of new and old concrete, difficulty in estimating shrinkage creep influence and the like exist.
Disclosure of Invention
In order to overcome the problems, the invention provides a shear part joint composite structure of a composite beam bridge and a construction method thereof, which aim to improve the structural form of the traditional shear part, strengthen the prefabricated assembly degree of components and the shear resistance of a shear connecting piece, and simultaneously play roles in enhancing the connection performance of prefabricated or cast-in-place concrete slabs and improving the stress state of joints.
The technical scheme adopted by the invention is as follows:
the invention provides a shear part joint composite structure of a combined beam bridge, which comprises a steel structure, left and right concrete plates and covering layers, wherein the steel structure consists of a steel beam and a connecting structure which is arranged on the steel beam along the length and is provided with left and right grooves; the length of the steel beam is not more than 80 meters.
And transverse reinforcing steel bars extending into the left concrete slab and the right concrete slab penetrate through the left groove and the right groove of the connecting structure.
The connecting structure comprises an inverted T-shaped lower splicing piece fixed on the steel beam and a plurality of plate-shaped upper splicing pieces arranged at the top of the lower splicing piece.
The steel beam is an I-shaped steel beam, the inverted T-shaped lower splicing piece comprises a transverse plate fixed on an upper flange plate of the I-shaped steel beam and a vertical plate arranged on the transverse plate, and left and right grooves of the connecting structure are formed in the upper splicing pieces and the transverse plate of the lower splicing piece and located on two sides of the vertical plate.
And the positions of the left groove and the right groove of the connecting structure are respectively penetrated through the upper splicing member, the left concrete plate, the right concrete plate, the transverse plate of the lower splicing member and the upper flange plate of the I-shaped steel beam by the bolt connecting member and are fastened.
Notches are arranged on the vertical plates of the lower splicing pieces at intervals and matched with the upper splicing pieces.
The invention provides a construction method of a shear part joint composite structure of a combined beam bridge, which adopts the shear part joint composite structure of the combined beam bridge and comprises the following steps:
and 6, after the anti-corrosion coating is constructed, constructing a paving layer 7.
8. The construction method as claimed in claim 7, wherein in the step 2, the prestressed corrugated pipe is installed simultaneously when the concrete slab includes the prestressed tendons, and the PVC pipe is used to reserve the pilot holes for the left and right concrete slabs.
9. The construction method as claimed in claim 7, wherein in the step 3, when the prestressed tendons are included in the concrete slab, the prestressed tendons are tensioned after the strength of the concrete is satisfied.
The invention has the beneficial effects that:
1. the steel structure concrete slabs are connected into a whole in a bolt connecting piece connection mode, on-site welding operation is avoided, and construction efficiency and quality controllability are improved.
2. The bolt connecting piece and the transverse steel bar play a role in connecting the steel beam and the concrete slabs on one hand, and play a role in strengthening cast-in-place seam connection between the left concrete slab and the right concrete slab on the other hand.
3. All the components of the steel structure in the shear part joint composite structure can be prefabricated and processed in a factory mode, bolts can be directly spliced on a construction site, convenience and rapidness are achieved, and construction progress can be accelerated.
4. The upper splicing piece plate in the shear joint composite structure is thin, small bending can be achieved under the action of the pretightening force of the bolt connecting piece, on-site construction errors can be corrected through self deformation bending, and the shear joint composite structure has good applicability.
5. The invention provides a complete set of construction method suitable for a shear part joint composite structure, which improves the stress characteristic of the shear part joint composite structure through a more scientific process and avoids structural damage and even damage caused by a wrong construction process.
To describe the present invention more specifically, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
Drawings
Fig. 1 is a perspective view of a shear member joint composite structure of a composite girder bridge according to the present invention.
Fig. 2 is a front view of a shear member joint composite structure of a composite beam bridge according to the present invention.
Fig. 3 is a side view of a shear member joint composite structure of a composite beam bridge of the present invention.
FIG. 4 is a sequence diagram of a construction method of a shear member joint composite structure of a composite beam bridge.
Detailed Description
As shown in fig. 1 and 2, the shear member joint composite structure of a composite beam bridge provided by the present invention comprises a steel structure consisting of a steel beam and a connecting structure provided with left and right grooves along the length thereof on the steel beam, left and right concrete plates 6, 6 'respectively extending into the left and right grooves of the connecting structure and fixed by a bolt connecting member 4, and a covering layer 7 covering the connecting structure and the left and right concrete plates 6, 6'; the length of the steel beam is determined according to design requirements, and generally does not exceed 80 meters.
A plurality of transverse reinforcing steel bars 5 extending into the left and right concrete slabs 6 and 6' transversely penetrate between the left and right grooves of the connecting structure.
The connecting structure comprises an inverted T-shaped lower splicing member 2 fixed on the steel beam and a plurality of plate-shaped upper splicing members 3 arranged at the top of the lower splicing member 2.
The steel beam is an I-shaped steel beam 1, the inverted T-shaped lower splicing piece 2 comprises a transverse plate 201 fixed on an upper flange plate 101 of the I-shaped steel beam 1 and a vertical plate 202 arranged on the transverse plate 201, and left and right grooves of the connecting structure are formed between the upper splicing pieces 3 and the transverse plate 201 of the lower splicing piece 2 and located on two sides of the vertical plate 202.
The transverse reinforcing steel bar 5 penetrates through the vertical plate 202 of the lower splicing element 2.
The positions of the left and right grooves of the connecting structure are respectively penetrated and fastened by the bolt connecting piece 4 through the upper splicing piece 3, the left and right concrete plates 6, the transverse plate 201 of the lower splicing piece 2 and the upper flange plate 101 of the I-shaped steel beam 1; the pavement layer 7 covers the upper splicing piece 3 and the left and right concrete plates 6.
The geometric dimensions of the left and right concrete slabs 6 and 6' can be designed according to actual structures, when the thickness of the slabs changes, the length and the diameter of the bolt connecting piece 4 need to be adjusted, and meanwhile, the geometric dimensions of the lower splicing piece 2 and the upper splicing piece 3 are adjusted to meet the requirement of structural stress checking calculation. In the actual bridge structural design, a paving layer 7 with the thickness of 8-12 cm can be adopted.
The material of the steel beam 1 can be adjusted according to the structural design of the bridge, the upper splicing piece 2 and the lower splicing piece 3 adopt Q460qd or above high-strength steel, and the bolt connecting piece 4 adopts M12 and above specification bolts which meet the standard of high-strength large hexagon head bolts GB/T1228 and 2006 for steel structures. When the span, the width and the height of the steel-concrete composite beam bridge structure change, the specification of the bolts and the corresponding materials which can be checked and calculated through the structural details are selected according to the actual design.
The upper flange plate 101, the lower splicing member 2, the upper splicing member 3, the left concrete plate 6 and the right concrete plate 6' of the I-shaped steel beam 1 are respectively provided with a positioning hole 8 for the bolt connecting member 4 to penetrate through, so that the bolt connecting member 4 can be screwed in, and the bolt connecting member 4 comprises a bolt 401, a gasket 402 and a nut 403. On one hand, the bolt connecting piece 4 applies pretightening force to the left concrete plate and the right concrete plate 6, so that the left concrete plate and the right concrete plate are combined with the I-shaped steel beam 1 more tightly, and meanwhile, the bolt connecting piece can resist the shearing force in a horizontal plane and act together with the penetrating transverse reinforcing steel bars 5, and the shearing resistance of the structure is improved.
Be equipped with the through hole 203 that supplies horizontal reinforcing bar 5 to pass on the riser 202 of lower splice 2, go up the interval of splice 3 and the recess at 2 tops of lower splice and can adjust according to actual bridge structural design, should pay attention to the relative position relation of through hole 203 on the splice 2 and the locating hole 8 of bolted connection 4 down simultaneously, avoid the two to take place the geometric conflict.
As shown in fig. 4, the construction method of the shear member joint composite structure of the composite beam bridge provided by the invention comprises the following steps:
A. i-shaped steel beam 1 and lower splicing member 2 are integrally prefabricated
Referring to fig. 4 (a), according to the actual structure, designing the overall geometric parameters of the i-shaped steel beam 1 and the lower splicing member 2, prefabricating and forming in a factory, and opening a hole in a positioning hole 8 of the bolt connecting member 4 at an appointed position, wherein the diameter of the positioning hole 8 is slightly larger than the nominal diameter of a screw of the bolt 401, preferably 1-1.5 mm larger, so as to ensure that the bolt 401 can be smoothly screwed into the positioning hole 8 when the installation on a construction site has deviation or the structure generates certain deflection under self weight; when actual conditions allow, the I-shaped steel beam 1, the lower splicing member 2 and the nut 403 can be integrally prefabricated at the same time, so that the workload of manpower for the nut 403 on the bottom of the flange plate 101 on the I-shaped steel beam 1 on a construction site is reduced.
B. Erecting concrete formwork, installing transverse steel bars 5 and binding common steel bars
As shown in fig. 4 (b), a concrete template is erected, transverse steel bars 5 are installed at through holes 203 on the lower splicing member 2, and meanwhile, common steel bars can be synchronously bound to accelerate the construction efficiency, and in addition, when a prestressed beam exists on a concrete slab according to the design requirement, a prestressed corrugated pipe can be synchronously constructed; adopt the PVC pipe to reserve locating hole 8 to left and right sides concrete slab 6, 6' to twist high strength bolt connecting piece 4 in the follow-up work, the PVC pipe location should be accurate, avoids dislocation or slope, should have certain stop device and leak-stopping device simultaneously, in order to avoid when concrete placement vibrates PVC pipe dislocation and concrete leaks thick liquid and blocks up and reserve the locating hole, causes bolt connecting piece 4 to twist smoothly.
C. Pouring concrete to form left and right concrete plates 6 and 6'
Referring to fig. 4 (c), concrete with good slump and workability is poured according to design to form the left and right concrete slabs 6 and 6', and the work of concrete finishing is carefully performed, so as to avoid that the upper splicing member 3 cannot be smoothly installed into the notch 204 of the lower splicing member 2 due to large deviation of the top surface of the concrete. When concrete thickness deviation exists, the thickness can be adjusted by considering top surface milling, grinding and the like. In addition, when the prestressed tendons exist, the prestressed tendons should be tensioned when the strength of the concrete reaches over 75% of a design value, a jack is adopted for double control of the stretching amount, the deviation of the stretching amount should be controlled within 6%, and the anchor head needs to be sealed in time.
D. Installing splicing pieces and screwing up the bolt connecting pieces to form a shear piece joint composite structure of the combined beam bridge
Referring to fig. 4 (d), the upper splicing member 3 is aligned with the notch 204 on the vertical plate 202 of the lower splicing member 2, and the bolt connecting member 4 is screwed in, and the bolt pretightening force needs to reach the designed value so as to prevent the bolt from loosening under the action of reciprocating load, so that the upper splicing plate 3 cannot generate effective prepressing force on the joint area of the left and right concrete plates 6 and 6'.
E. Anticorrosive coating treatment
After the composite structure with the shear member joints of the composite beam bridge is formed, the surface of the steel structure in the composite structure is painted to prevent the corrosion of the steel structure under the combined action of air, moisture, temperature and the like, as shown in fig. 4 (e).
F. Construction of paving layer
And (f) shown in fig. 4, after the anti-corrosion coating is constructed, constructing a paving layer 7.
The shear part joint composite structure of the combined beam bridge simultaneously plays a role of a shear connecting piece and a reinforced concrete and joint position reinforcing piece, the high-strength bolt simultaneously provides vertical pretightening force and shear rigidity in a horizontal plane, the tensile stress of the top surface of the joint can be effectively reduced, and the shear bearing capacity is increased under the combined action of the high-strength bolt and the transverse steel bar. Meanwhile, all components are prefabricated in a factory, only bolt bolting is needed in site construction, the complex process of site welding is avoided, and the construction speed and the construction quality are improved.
Table 1 shows the peak displacement, peak load comparison in the push out test of the inventive example with the most commonly used conventional shear pin connector, PBL connector, and table 2 shows the top bridge-wise stress (positive in tension and negative in compression) of the concrete slab at standard load combinations of the inventive example with the most commonly used conventional shear pin connector, PBL connector. As can be seen from table 1, the peak load of the present invention is larger and the peak displacement is smaller compared to the conventional shear member; as can be seen from table 2, the present invention has considerable improvement in the top stress of the concrete slab, increases the stress reserve, and is more advantageous to the structural safety.
TABLE 1 comparison of peak load and peak displacement
TABLE 2 Top stress comparison of concrete slabs under Standard load combination
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (9)
1. A shear part joint composite structure of a composite beam bridge is characterized by comprising a steel structure, left and right concrete plates and covering layers, wherein the steel structure is composed of a steel beam and a connecting structure which is arranged on the steel beam along the length and provided with left and right grooves; the length of the steel beam is not more than 80 meters.
2. A shear member joint composite structure for a composite girder bridge according to claim 1, wherein a transverse reinforcing bar inserted into the left and right concrete slabs penetrates between the left and right recesses of the connection structure.
3. A shear member joint composite structure of a composite beam bridge according to claim 2, wherein the connecting structure comprises an inverted T-shaped lower splicing member fixed to the steel beam and a plurality of plate-shaped upper splicing members provided on top of the lower splicing member.
4. The shear joint composite structure of a composite beam bridge as claimed in claim 3, wherein the steel beam is an I-beam, the inverted T-shaped lower splicing member comprises a transverse plate fixed on the upper flange plate of the I-beam and a vertical plate arranged on the transverse plate, and the left and right grooves of the connecting structure are formed between the transverse plates of the upper splicing member and the lower splicing member and located on two sides of the vertical plate.
5. A shear member joint composite structure of a composite beam bridge according to claim 4, wherein the bolt connecting members are respectively inserted through and fastened to the upper splicing member, the left and right concrete plates, the transverse plate of the lower splicing member and the upper flange plate of the I-shaped steel beam at the positions of the left and right grooves of the connecting structure.
6. A shear joint composite structure for a composite beam bridge according to claim 5, wherein the risers of the lower splice are spaced apart to mate with the upper splice.
7. A construction method for a shear member joint composite structure of a composite beam bridge according to claim 6 is characterized by comprising the following steps:
step 1, integrally prefabricating the I-shaped steel beam and the lower splicing piece in a factory;
step 2, installing the I-shaped steel beam and the lower splicing piece on site, erecting a concrete template, installing transverse steel bars and binding common steel bars;
step 3, pouring concrete to form left and right concrete slabs;
step 4, installing splicing pieces, and screwing down the bolt connecting pieces to form a shear piece joint composite structure of the combined beam bridge;
step 5, after a shear part joint composite structure of the combined beam bridge is formed, spraying paint on the surface of the steel structure to prevent the corrosion of the steel structure under the combined action of air, moisture, temperature and the like;
and 6, after the anti-corrosion coating is constructed, constructing a paving layer 7.
8. The construction method as claimed in claim 7, wherein in the step 2, the prestressed corrugated pipe is installed simultaneously when the concrete slab includes the prestressed tendons, and the PVC pipe is used to reserve the pilot holes for the left and right concrete slabs.
9. The construction method as claimed in claim 7, wherein in the step 3, when the prestressed tendons are included in the concrete slab, the prestressed tendons are tensioned after the strength of the concrete is satisfied.
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| CN114352053A (en) * | 2021-12-15 | 2022-04-15 | 江苏海洋大学 | Prefabricated floor slab bearing capacity reinforcing method |
| CN116219866A (en) * | 2023-05-08 | 2023-06-06 | 北京建工土木工程有限公司 | Shearing and pulling resistant connecting piece and construction method thereof |
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Application publication date: 20211210 |