CN116427260A - Web embedded composite shear key and construction method - Google Patents
Web embedded composite shear key and construction method Download PDFInfo
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- CN116427260A CN116427260A CN202310514792.3A CN202310514792A CN116427260A CN 116427260 A CN116427260 A CN 116427260A CN 202310514792 A CN202310514792 A CN 202310514792A CN 116427260 A CN116427260 A CN 116427260A
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- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 106
- 239000010959 steel Substances 0.000 claims abstract description 106
- 239000004567 concrete Substances 0.000 claims abstract description 55
- 230000000149 penetrating effect Effects 0.000 claims abstract description 31
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction 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
- 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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- 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a web embedded type composite shear key and a construction method thereof, wherein the composite shear key comprises a web embedded part, penetrating steel bars, transverse bolts and the like, wherein the part of a web embedded in a concrete bridge panel is provided with holes for the steel bars to penetrate, the transverse bolts are welded between the transverse penetrating steel bars, the bolts are welded on the web, the composite shear key connects inverted T-shaped steel and the concrete bridge panel into a whole to bear external load together, and compared with the traditional shear key, the upper flange plate is reduced, the steel consumption and the welding workload are reduced, and the composite shear key can accord with the design concept of high efficiency and light weight. Has better bearing capacity and higher integral ductility. The novel composite shear force bond with the embedded web plate can be better suitable for the design and construction method of the high-efficiency and light-weight assembled bridge, the T-shaped steel is used for replacing I-steel, the welding work between the connecting piece and the steel beam is reduced, and the time for manufacturing and construction is greatly shortened.
Description
Technical Field
The invention relates to the technical field of civil design and construction, in particular to a web embedded type composite shear key and a construction method.
Background
With the continuous perfection of the transportation system, the transportation industry in China achieves brilliant achievement, and the bridge engineering is an important component of the transportation industry. Among different types, the steel-concrete composite structure bridge is increasingly widely adopted in bridge construction due to the advantages of light dead weight, excellent overall ductility, large available space, shorter construction period, capability of fully reducing the influence of earthquakes and the like. The most outstanding characteristic is that the properties of two materials, namely steel and concrete, are fully exerted, and the key to achieving the effect is that the two materials are effectively connected. The shear key is a member capable of well realizing effective connection of steel and concrete, effectively improves the shear bearing capacity of the structure, and restricts the mutual sliding between the steel and the concrete, so that the steel and the concrete are firmly and reliably connected into a whole.
There are two types of shear keys commonly used at present: peg and perforated steel plate connectors (also referred to as PBL connectors). The two shear connectors each have advantages. The stud is a flexible connecting piece, has small volume, flexible and convenient arrangement, but has small shearing bearing capacity and needs a special welding machine; the PBL connecting piece is a rigid connecting piece, the arrangement has directivity, the round holes are generally provided with penetrating reinforcing steel bars, the construction property of the arrangement of the reinforcing steel bars can be improved, the shearing bearing capacity is large, the fatigue performance is good, and welding by a welding machine is needed.
At present, students at home and abroad generally study the mechanical properties (shear bearing capacity, destruction form, shear rigidity and the like) of the two shear keys through a large number of experimental researches and finite element analyses, and a plurality of achievements are obtained. From the research and practical application situations of the two connecting pieces at present, the following problems still exist:
(1) There are few studies and applications of PBL shear keys, and most countries do not incorporate PBL shear keys into the regulations.
(2) In bridge practice, most often only one of the connectors is used, either a peg connector or a PBL connector. Even if a few occasions are matched for use, a reasonable design method is lacked as a basis. This makes the shear key mixed use unable to fully exert its own shear bearing capacity.
(3) Both connecting pieces are welded to form a whole with the steel beam. The welding inevitably generates residual stress and stress concentration, and brings certain potential safety hazards to the mechanical properties and long-term durability of the steel-concrete combined structure bridge, especially the steel-concrete section.
(4) Along with the development of assembly and rapid construction, aiming at simplifying the construction process, a shear key which can meet higher requirements and has larger shearing bearing capacity is required.
In modern bridge engineering, the stud connecting piece and the PBL shear key are welded on the I-shaped steel beam through the perforated steel plate, and the construction mode has two obvious defects, namely, the welding workload is high, and the requirements of rapid and efficient construction are not met; firstly, the steel consumption is larger. Through analysis of the prior PBL shear key research, the contribution of the I-steel upper flange to the shearing bearing capacity is almost negligible.
Disclosure of Invention
In view of the above, the present invention aims to provide a novel composite shear key with embedded web plates and a construction method thereof, wherein the method utilizes the web plates of T-shaped steel to extend into the interior of a concrete bridge deck to serve as steel plates of PBL connectors.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a web embedded type composite shear key, which comprises an inverted T-shaped steel plate beam, a bolt and a penetrating steel bar; the inverted T-shaped steel plate beam comprises a web plate and a lower flange, and the lower flange and the web plate are vertically connected in a crossing manner; the web plate is provided with an opening at the part embedded into the concrete bridge deck, and the penetrating steel bars are arranged in the opening and are transversely arranged along the web plate; the studs are arranged transversely between the penetrating bars and welded to the web of the embedded concrete.
Further, a row of holes are formed in the web plate, transverse reinforcing steel bars pass through the holes, and the holes are matched with the reinforcing steel bars.
Further, the studs are transversely arranged between the steel bars; the studs are arranged at equal distances, and the reinforcing bars are arranged at equal distances.
Further, the web is perpendicular to the lower flange, the lower flange steel plate and the concrete slab play a role in resisting bending moment, the web plays a role in resisting shearing force, and the embedded web, the transverse steel bars and the transverse studs play a role in shearing force connecting pieces.
Further, the pegs are arranged on the web plate in a welding mode.
The invention provides a construction method of a composite shear key embedded according to a web plate, which comprises the following steps:
the web and lower flange can be manufactured first. Thereafter, openings are made in the upper edge of the web. The web and lower flange plates are then inverted and the web apertured portion is placed into the prepared concrete form. And auxiliary components such as cushion blocks and inclined supports are used for keeping the web plate vertical and position. Then, arranging transverse steel bars to penetrate through web openings, welding transverse bolts, arranging common steel bar meshes in concrete, and pouring the concrete. After the concrete is set, the concrete can be transported to the bridge site.
The invention has the beneficial effects that:
the invention provides a novel web embedded composite shear key and a construction method thereof, wherein the composite shear key comprises an embedded web, transverse penetrating steel bars, transverse pegs and in-hole concrete tenons; the inverted T-shaped steel plate comprises a web plate and a lower flange; the lower flange is perpendicularly connected with the web plate in a crossing mode, an opening for the steel bar to pass through is formed in the portion of the web plate embedded into the concrete bridge deck plate, and transverse studs are arranged among the transverse penetrating steel bars and welded on the embedded web plate.
Compared with the traditional shear key, the web embedded type composite shear key reduces the steel consumption and the welding workload, and can meet the design concept of high efficiency and light weight. The research shows that the web embedded composite shear key has better bearing capacity and higher integral ductility. The composite shear key integrates the advantages of the two connecting pieces of the stud and the PBL, and improves the integral shear bearing capacity and the vertical pulling resistance. The novel composite shear key embedded in the web plate can be better suitable for the design and construction methods of the high-efficiency and light-weight assembled bridge.
The device overcomes the defects of the existing shear key, the inverted T-shaped steel is used for replacing I-steel, the web plate of the inverted T-shaped steel stretches into the concrete bridge deck to a certain depth, the embedded web plate serves as a steel plate of the PBL connecting piece, and holes are formed in the embedded web plate, so that welding work between the connecting piece and the steel beam can be omitted, and the time for manufacturing and construction is greatly shortened. In addition, the steel bars are carried out in the holes, transverse bolts are arranged among the steel bars, and the concrete bridge deck is supported and connected through the combined action of the concrete tenons, the penetrating steel bars and the bolts. In the composite system, external load is borne by the concrete bridge deck and the inverted T-shaped steel plate beams together, the composite shear key plays a role in connecting the concrete bridge deck and the inverted T-shaped steel plate beams into a whole, and the transverse arranged studs can enhance the vertical anti-pulling bearing capacity of the connecting piece. The composite shear connector saves material and labor cost, is a more economic and reasonable connector, and can meet the design concept of high efficiency and light weight.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention provides the following drawings for description:
FIG. 1 is a construction diagram of a web embedded composite shear key.
Fig. 2 is an application of the web embedded composite shear key in the bonding section.
Fig. 3 is an application of the composite Liang Zhongfu plate embedded composite shear key.
In the figure, the steel plate beam is 1-inverted T-shaped, the bolt is 2-shaped, the steel bar is 3-penetrating and the concrete is 4-shaped.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
Example 1
As shown in fig. 1, fig. 1 is a schematic structural diagram of a web embedded novel composite shear key, and the web embedded composite shear key provided in this embodiment includes an inverted T-shaped steel plate beam, laterally arranged studs and penetrating steel bars; the inverted T-shaped steel plate beam comprises a web plate and a lower flange, and the lower flange and the web plate are vertically connected in a crossing manner;
the web plate is provided with an opening at the part embedded into the concrete bridge deck, and the penetrating steel bars are arranged in the opening and are transversely arranged along the web plate; the studs are transversely arranged between the penetrating steel bars; the pegs are arranged on the web plate in a welding mode.
The web plate of the inverted T-shaped steel in the embodiment stretches into the concrete bridge deck to a certain depth, the embedded web plate part serves as a steel plate of the PBL connecting piece and is provided with holes, the holes are used for penetrating the steel bars, transverse bolts are arranged between the steel bars, and the concrete bridge deck is supported and connected under the combined action of the concrete tenons, the penetrating steel bars and the bolts; in the composite structure, the composite shear key connects the concrete bridge deck and the inverted T-shaped steel plate beam into a whole to bear external load together, and the transverse arranged studs can enhance the vertical anti-pulling bearing capacity of the connecting piece.
The openings are matched with the transverse steel bars; the studs are arranged between the transverse steel bars; the studs are arranged at equal distances, and the steel bars are arranged at equal distances; a row of holes are formed in the web plate, and the intervals of the holes are equal;
the web plates in the inverted T-shaped steel are vertically arranged and resist shearing force; the lower flange plate resists bending moment;
the composite shear key in this embodiment is different from the traditional PBL shear key, and the most intuitive characteristic of the web embedded composite shear key is to use the T-steel instead of the i-steel, and directly integrate the perforated steel plate welded on the original i-steel onto the web of the T-steel.
In the traditional PBL shear key, continuous densely arranged penetrating steel bar consumable materials are larger, and the penetrating steel bar construction requirement is higher, so that the web embedded type composite shear key increases the arrangement interval of the penetrating steel bars, and the studs are welded in the middle, so that the studs are transversely welded on the web, and the rigidity of the shear key is ensured. The mode enhances the wrapping of the concrete on the stud, improves the shearing resistance of the composite shear key, and can resist the longitudinal shearing force and the vertical lifting force between interfaces. The embedded webs, the penetrating steel bars, the bolts and the concrete tenons form a composite shear key, which connects the concrete bridge deck and the inverted T-shaped beams into a whole and bears external loads together, as shown in figure 1.
The web embedded type composite shear key in the embodiment can be better applied to the joint section of a large-span steel-concrete combined bridge because of no flange plate, as shown in fig. 2. In the combination section, in order to enhance the connection between the concrete and the steel beam, two rows of steel bars and bolts can be arranged, so that the integrity and bearing capacity of the whole connection section are enhanced.
Aiming at bridges with smaller spans, the web embedded type composite shear key can provide a high-efficiency and light-weight assembly type bridge design method. First, according to the web embedded composite shear key, a full-span T-shaped steel-concrete bridge deck module is prefabricated, as shown in fig. 3, each module is composed of one or two standard T-shaped steels and reinforced concrete panels, the single T-shaped steel module can meet the requirement of light weight to the greatest extent, and the double T-shaped steel module provides more stability in the manufacturing, transporting and installing processes.
Compared with the traditional shear key, the web embedded composite shear key provided by the embodiment reduces the steel consumption and the welding workload, and can meet the design concept of high efficiency and light weight. The research shows that the web embedded composite shear key has better bearing capacity and higher integral ductility. The composite shear key integrates the advantages of the two connecting pieces of the stud and the PBL, and improves the integral shear bearing capacity and the vertical pulling resistance. The web embedded composite shear key can be better suitable for high-efficiency and light-weight assembly type bridge design and construction methods.
Example 2
The embodiment provides a construction method according to the composite shear key with the embedded web plate, which comprises the following steps:
the web and lower flange can be manufactured first. Thereafter, openings are made in the upper edge of the web. The web and lower flange plates are then inverted and the web apertured portion is placed into the prepared concrete form. And auxiliary components such as cushion blocks and inclined supports are used for keeping the web plate vertical and position. Then, arranging transverse steel bars to penetrate through web openings, welding transverse bolts, arranging common steel bar meshes in concrete, and pouring the concrete. After the concrete is set, the concrete can be transported to the bridge site.
The web embedded type composite shear key provided by the embodiment comprises a web embedded part, penetrating steel bars, transverse studs and the like. The web is provided with the trompil that is used for the reinforcing bar to pass in the part of burying in concrete bridge deck, transversely runs through and has welded transverse peg between the reinforcing bar, and the peg welds on the web, and compound shear key is with falling T shaped steel and concrete bridge deck and is connected into whole, bears external load jointly. The inverted T-shaped steel plate comprises a web plate and a lower flange plate. The lower flange plate and the web are vertically connected in an intersecting mode, compared with a traditional shear key, the upper flange plate is reduced, steel consumption and welding workload are reduced, and the design concept of high efficiency and light weight can be met. Has better bearing capacity and higher integral ductility. The composite shear key integrates the advantages of the two connecting pieces of the stud and the PBL, and improves the integral shear bearing capacity and the vertical pulling resistance.
The web embedded composite shear key provided by the embodiment can be better suitable for high-efficiency and light-weight assembly bridge design and construction methods. The device overcomes the defects of the existing shear key, utilizes the T-shaped steel to replace I-shaped steel, reduces welding work between the connecting piece and the steel beam, and greatly quickens the time of manufacturing and construction.
The composite shear key with the embedded web plate in the embodiment is characterized in that the T-shaped steel is used for replacing the I-shaped steel, and the perforated steel plate welded on the original I-shaped steel is directly integrated on the web plate of the T-shaped steel. And the arrangement space of the penetrating reinforcing steel bars is increased, and the studs are welded in the middle, so that the studs are transversely welded on the web plate, and the rigidity of the shear key is ensured. Simultaneously, the concrete tenon, the penetrating steel bar and the bolt are jointly used for supporting and connecting the concrete bridge deck so as to form a composite system. In the composite system, an embedded web plate, penetrating steel bars and transverse bolts form a composite shear key together, a concrete bridge deck plate and an inverted T-shaped steel plate beam are connected into a whole to bear external load together, the concrete bridge deck plate and a lower flange mainly bear bending moment, and the web plate bears shear force.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. The web embedded type composite shear key is characterized in that: comprises an inverted T-shaped steel plate beam, a bolt and a penetrating steel bar; the inverted T-shaped steel plate beam comprises a web plate and a lower flange, and the lower flange and the web plate are vertically connected in a crossing manner; the web plate is provided with an opening at the part embedded into the concrete bridge deck, and the penetrating steel bars are arranged in the opening and are transversely arranged along the web plate; the studs are arranged transversely between the penetrating steel bars.
2. The web-embedded composite shear key of claim 1, wherein: at least one row of holes are formed in the web plate, and the transversely arranged penetrating steel bars pass through the holes and are matched with the steel bars.
3. The web-embedded composite shear key of claim 1, wherein: the bolt nails are transversely arranged between the penetrating steel bars; the studs are arranged at equal distances, and the reinforcing bars are arranged at equal distances.
4. The web-embedded composite shear key of claim 1, wherein: the web is perpendicular to the lower flange, the lower flange steel plate and the concrete slab play a role in resisting bending moment, the web plays a role in resisting shearing force, and the embedded web, the transverse penetrating steel bars and the transverse studs play a role in shearing force connecting pieces.
5. The web-embedded composite shear key of claim 1, wherein: the composite shear key consists of an embedded web plate, transverse penetrating steel bars and transverse studs, and the studs are arranged at the embedded part of the web plate in a welding mode.
6. According to the novel composite shear key embedded in the web, a construction method is provided, which comprises the following steps:
firstly, manufacturing a web plate and a lower flange, and then, perforating the upper edge of the web plate; then inverting the web and the lower flange plate, placing the open hole part of the web into a prepared concrete template, and keeping the web vertical and position by using auxiliary components; then, arranging transverse penetrating steel bars, penetrating through web openings, welding transverse pegs, arranging common steel bar meshes in concrete, and pouring concrete; after the concrete is set, the concrete is transported to the bridge site.
7. The web-embedded composite shear key of claim 6, wherein: the auxiliary member comprises a cushion block or an inclined support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310514792.3A CN116427260A (en) | 2023-05-09 | 2023-05-09 | Web embedded composite shear key and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310514792.3A CN116427260A (en) | 2023-05-09 | 2023-05-09 | Web embedded composite shear key and construction method |
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| Publication Number | Publication Date |
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| CN116427260A true CN116427260A (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310514792.3A Pending CN116427260A (en) | 2023-05-09 | 2023-05-09 | Web embedded composite shear key and construction method |
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| CN (1) | CN116427260A (en) |
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2023
- 2023-05-09 CN CN202310514792.3A patent/CN116427260A/en active Pending
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