CN210622062U - Longitudinal shear-resistant steel bar and precast slab separated laminated slab composite beam - Google Patents
Longitudinal shear-resistant steel bar and precast slab separated laminated slab composite beam Download PDFInfo
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- CN210622062U CN210622062U CN201920120142.XU CN201920120142U CN210622062U CN 210622062 U CN210622062 U CN 210622062U CN 201920120142 U CN201920120142 U CN 201920120142U CN 210622062 U CN210622062 U CN 210622062U
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- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 title claims description 98
- 239000010959 steel Substances 0.000 title claims description 98
- 230000002787 reinforcement Effects 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 20
- 230000003014 reinforcing effect Effects 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 15
- 210000003205 muscle Anatomy 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 206010063659 Aversion Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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Abstract
The utility model relates to a superimposed sheet combination beam of vertical shear reinforcement and prefabricated plate separation belongs to building structure technical field. The utility model discloses a platform concrete precast slab is opened to the tip, additional reinforcing bar net piece unit and upper portion concrete post-cast layer. The end part of the concrete precast slab with the platform is provided with no ribs, the top part of the slab is provided with a step-shaped platform with a certain width, a reinforcing mesh sheet unit formed by binding longitudinal and transverse reinforcing steel bars is placed in the platform, the transverse reinforcing steel bars play a role of longitudinal shearing resistance of the composite beam, and the reinforcing steel bars are placed in the step-shaped platform in parallel along the length direction of the beam to play a role of positioning and fixing. The utility model discloses cancelled traditional prefabricated plate beard muscle in the composite beam, opened the step platform through the board end, the problem of the vertical shear problem of composite beam and vertical shear reinforcement location has been solved to the form of embedding reinforcing bar net piece unit. The structure has definite force transfer and convenient construction, and is suitable for a composite slab combined beam system in the fields of building engineering, bridge engineering and the like.
Description
Technical Field
The utility model relates to a superimposed sheet combination beam of vertical shear reinforcement and prefabricated plate separation belongs to building structure technical field.
Background
In structural systems such as assembled composite floor systems, composite beam bridges and the like, the composite beam system is widely applied. In the composite beam, the longitudinal shear steel bar is indispensable, and plays a role in preventing the splitting damage.
In the cast-in-place concrete flange composite beam, the transverse steel bars of the concrete slab are also used as the longitudinal shear steel bars of the composite beam, and because the concrete beam is operated on site, the position of the transverse steel bars can be finely adjusted at any time according to the actual position of the stud during steel bar binding, so that the collision between the stud and the transverse steel bars is avoided.
In the composite beam of the laminated plate concrete flange, the transverse steel bars of the precast slabs extend out to serve as the beard steel bars to play a role of longitudinal shear-resistant steel bars. To avoid positional conflicts between the beard and the peg:
(1) for a linear combined beam (a building structure and a linear combined bridge), the transverse steel bar spacing of the concrete precast slabs must be consistent with the longitudinal spacing of the studs, the width of the precast slabs along the bridge direction must be integral multiple of the longitudinal spacing of the studs, which greatly affects the freedom degree of design, and in addition, when the longitudinal spacing of the studs is changed (such as a continuous beam) in engineering, precast slabs with different specifications are required to be adopted, so that the standardization degree of the slabs is reduced;
(2) for a curve composite beam (curve composite bridge), a method of direct curve instead of curve is adopted to approximate to a plane line shape, and a standardized modulus basically does not exist in the dimension of the prefabricated slab.
Therefore, the core for solving the above problems is: the longitudinal shear steel bars and the prefabricated slab are independent from each other and do not interfere with each other.
In view of the above problem, european specification 4(Eurocode 4) gives a solution that: the ends of the plates do not extend beyond the mustache reinforcing bars and then longitudinal shear reinforcing bars are attached. But this solution has the problem that the additional reinforcement is inconvenient to position and fix on site.
This patent proposes an improvement to the end and side construction of traditional prefabricated panels, with emphasis on enhancing the ease of positioning and fixing of the longitudinal reinforcement in the field, on the basis of the method proposed by european norm 4. And (3) eliminating the beard ribs at two ends of the concrete precast slab, pre-opening a step-shaped platform at a slab end support along the full length of the slab width, after the precast slab is hoisted in place, arranging additional reinforcing mesh sheet units on the step-shaped platform, and pouring upper-layer concrete to form the concrete composite slab. The improved method solves the problem of conflict between the overhanging beard ribs and the studs of the traditional precast slab, and also solves the problem of inconvenient positioning and fixing of the additional reinforcing steel bars on site in the method suggested by European specification 4. The prefabricated slab composite beam has the advantages that the longitudinal shear steel bars and the transverse steel bars in the prefabricated slab are independent and do not interfere with each other, the assembly degree of the composite beam of the laminated slab is improved, the on-site construction difficulty is reduced, the arrangement and the positioning of the additional steel bars are facilitated, the effective connection of the prefabricated slab, a post-cast layer and a steel beam is guaranteed, and the overall performance of the composite beam of the laminated slab is improved.
Disclosure of Invention
The invention provides a structural form of a composite slab composite beam with separated longitudinal shear-resistant steel bars and precast slabs, aiming at the limitation and the defect of the application of the traditional concrete precast slabs in the composite slab composite beam, and solving the problems of inconvenient transportation of the traditional precast slabs, easy conflict of beard bars during construction, inconvenient fixation and positioning of additional steel bars and the like.
The composite beam of the laminated slab with the longitudinal shear steel bars and the prefabricated slabs separated from each other cancels the beard bars extending outwards from two ends of the prefabricated slabs of the traditional composite beam of the laminated slab, and simultaneously a step-shaped platform is reserved at the lap joint of the upper flanges of the prefabricated slabs and the steel beams. And for the concrete precast slabs at the crossing positions of the two-direction combined beams, the concrete precast slabs are lapped on the other side edge of the upper flange of the steel beam in the other direction, and a platform with the same structure is also arranged to meet the requirement of separating the longitudinal shear steel bars and the precast slabs in the other direction. After the prefabricated slab of the open-step platform is hoisted in place, the additional reinforcing mesh units are arranged on the platform at the slab end, and then concrete is poured to form the concrete composite slab, so that the integrity and the safety of the composite beam of the composite slab are ensured, the force transfer is clear, and the assembly degree and the construction speed of the composite beam of the composite slab are improved.
The technical scheme of the invention is as follows:
a longitudinal shear steel bar and laminated slab composite beam separated from each other is characterized in that the laminated slab composite beam comprises a concrete prefabricated slab with an open platform at the end part, an additional steel mesh unit and an upper concrete post-pouring layer; the end of the concrete precast slab with the end opening platform is not provided with ribs, and a step-shaped platform is opened on the slab top at the lap joint of the precast slab and the upper flange of the steel beam; the reinforcing mesh unit comprises transverse reinforcing steel bars which are positioned at the tops of the precast slabs and play a role in longitudinal shear resistance, and positioning reinforcing steel bars which are embedded on a platform formed by the precast slabs and are arranged along the length direction of the beam; the reinforcing mesh units are placed on the platforms formed by the precast slabs on the two sides of the upper flange of the steel beam; the slab end of the concrete precast slab of the slab open platform is connected with two adjacent parallel composite beams; the upper concrete post-cast layer and the precast slabs form a concrete laminated slab, and the concrete precast slabs are firmly connected through the step-shaped platform, the additional reinforcing mesh units in the platform, the post-cast concrete, the post-cast layer and the steel beams, so that the integrity and the safety of the laminated slab composite beam are ensured.
The structure is characterized in that no rib is arranged at two ends of a concrete precast slab, a stepped platform is arranged at a slab end support along the whole width and length of the slab, an additional reinforcing steel bar mesh unit is embedded in the platform, the width of the platform meets the positioning requirement of the additional reinforcing steel bar mesh unit, post-cast concrete can be fully poured into the platform and between the precast slabs, the depth of the platform is guaranteed not to conflict with transverse reinforcing steel bars in the slab, the transverse reinforcing steel bars in the reinforcing steel bar mesh unit can be placed on the top of the precast slab, reinforcing steel bars in the beam length direction can be placed on the platform, and the concrete slab at the bottom of the platform can still be completely used as a template of a concrete post-cast layer. And for the concrete precast slabs at the crossing positions of the two-direction combined beams, the concrete precast slabs are lapped on the other side edge of the upper flange of the steel beam in the other direction, and a platform with the same structure is also arranged to meet the requirement of separating the longitudinal shear steel bars and the precast slabs in the other direction. The depth of the platform also ensures that the platform does not conflict with the transverse steel bars in the slab, ensures that the transverse steel bars in the steel bar mesh units can be placed at the top of the precast slab, the steel bars along the length direction of the beam can be placed on the platform, and the concrete slab at the bottom of the platform is still complete and can be used as a template of a concrete post-pouring layer.
The additional reinforcing mesh sheet unit arranged on the plate-end stepped platform is characterized in that transverse reinforcing steel bars in the reinforcing mesh sheet unit can be arranged on the top of a precast slab to replace the function of the traditional beard bars and serve as longitudinal shear-resistant reinforcing steel bars of the composite beam; the reinforcing steel bars can be placed on the platform along the length direction of the beam, and play a role in positioning and fixing the transverse reinforcing steel bars in the reinforcing steel bar mesh units.
The upper concrete post-cast layer is characterized in that the precast slabs and the steel beam upper flange are used as templates for casting, no additional template is required to be built, and post-cast concrete flows into the step-shaped platform of the precast slabs and between the precast slabs on two sides of the steel beam upper flange, so that the concrete post-cast layer, the additional steel bars and the precast slabs form a concrete laminated slab which can bear force cooperatively.
Compared with the prior art, the invention has the following beneficial effects:
(1) the beard ribs at the two ends of the prefabricated plate are cancelled, the prefabricated plate is convenient to transport, the conflict between the beard ribs of the prefabricated plate on the two sides and the flange studs on the steel beams is avoided during construction, and the construction difficulty is reduced. (2) The bar-shaped slotted holes are additionally arranged at the two ends of the prefabricated plate, the additional steel bars are arranged in the slotted holes, positioning is facilitated, post-cast concrete ensures that the additional steel bars and the prefabricated plate work in a cooperative mode, and the additional steel bars can replace the original beard bars. (3) The platform is seted up to the prefabricated plate side, conveniently arranges the additional reinforcing bar that links to each other with the combination beam along the board length direction, and has shortened the distance of additional reinforcing bar with the inboard reinforcing bar, and it is more direct effective to pass power. (4) The additional steel bars can be used as longitudinal shear-resistant steel bars of the composite beam besides ensuring the integrity and continuity of the composite slab, so that materials can be fully utilized, and the structure is simplified. (5) The structure has the advantages of definite force transmission, reasonable stress, simple structure, convenient construction and good economical efficiency.
Drawings
FIG. 1 is a schematic diagram showing the relative relationship between the prefabricated slab with the open end platform and the steel beam, the additional steel bar net and the concrete post-cast layer.
FIG. 2 is a schematic cross-sectional view of a composite beam of a composite slab according to the present invention.
Fig. 3 is a plan view of the prefabricated slab with open end platforms, additional steel meshes, flange bolts on the steel beams, and additional steel meshes according to the present invention.
Fig. 4 is a plan view of the prefabricated slab with open end platforms and additional steel meshes, flange studs on steel beams and additional steel meshes applied to the curved bridge deck with a combined structure.
Fig. 5 is a schematic sectional structure view of a cast-in-place concrete composite beam.
Fig. 6 is a schematic cross-sectional structure view of a conventional composite concrete composite beam with a beard rib.
Fig. 7 is a diagram of arrangement of additional longitudinal shear reinforcement bars of a composite girder of a laminated slab suggested to be optimized by european norm 4.
In the figure: 1, opening a platform precast slab at the end part; 2, longitudinal steel bars in the precast slabs; 3, a platform is arranged at the end part of the precast slab; 4, adding a steel bar mesh unit in the platform; 5, post-pouring a concrete layer; 6-steel beam; 7-steel beam upper flange stud; 8, opening platform precast slabs at four sides of the crossing part of the two-direction combination beams; 9-opening the platform along the long edge direction; 10-the other direction steel beam.
Detailed Description
The structure and construction process of the present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the composite beam of the composite slab with the separated longitudinal shear steel bars and the precast slabs comprises a concrete precast slab (1) with an open platform at the end part, an additional steel bar net unit (4) in the platform and a concrete post-pouring layer (5), wherein two ends of the precast slab (1) are provided with beard bars, and the longitudinal steel bars (2) in the slab are flush with the slab end of the precast slab (1). When a precast slab component is manufactured in a factory, the stepped platform (3) is pre-opened at the end part of the slab, the end part of the concrete precast slab (1) with the end-opened platform is lapped on the upper flange of the steel beam (6), and the precast slab does not conflict with the upper flange stud (7) of the steel beam when being installed due to the fact that beard ribs are cancelled, and construction is facilitated. After the precast slabs (1) are hoisted in place, additional steel bars (4) are placed in the slab end open platform (3), and a concrete post-cast layer (5) is poured by taking the precast slabs (1) and the steel beams (6) as templates to form the concrete composite slab.
As shown in figure 2, the concrete post-cast layer (5) flows into the slab end open platform (3) and is integrated with the precast slabs (1) and the additional steel bar mesh units (4) in the open platform, so that the integrity of the assembled combined structure is ensured. The additional reinforcing mesh units (4) are fixed in the platform (3) opened by the precast slab, so that the problems of positioning and fixing of transverse reinforcing steel bars are solved, and meanwhile, the longitudinal shear-resisting effect of the composite beam can be effectively realized.
As shown in fig. 3, when the composite beam is applied to a composite floor system or a composite structure bridge, in order to solve the cracking problem of a concrete slab at a hogging moment region of a beam end, the pin pitch is properly increased at a beam section of the hogging moment region, or a pulling-resistant non-shear-resistant connecting member with a larger pitch is adopted, so that a certain combination effect is released. The distance between the studs, which varies with the beam section, may conflict with the ribs extending from the conventional composite beam of the composite slab, and it is often necessary to adjust the distance and modulus of the longitudinal reinforcing bars in the precast slab to avoid the conflict in design, thereby affecting the degree of freedom in design and the standardization of the concrete precast slab. The composite beam of the composite slab adopting the longitudinal shear steel bars and the prefabricated slabs which are separated solves the problem, the prefabricated slabs can be designed according to a unified standard scheme, and the position requirement of the variable-spacing stud during installation can be met only by changing the spacing of the additional transverse steel bars in the additional steel bar mesh units, so that the position conflict with the stud is avoided.
Similarly, when the composite laminated slab beam is applied to a composite structure bridge system, particularly a design scheme of a curved bridge deck system, because the upper flange of the steel beam is a curved scheme in a plane, the corresponding arrangement scheme of the studs of the upper flange is also in non-equidistant arrangement. The conventional construction scheme of the composite slab beam also faces the problem of conflict between transverse steel bars and studs. The composite beam of the composite slab with the longitudinal shear-resistant steel bars and the prefabricated slabs separated can also be suitable for solving the problem, the prefabricated slabs can be designed according to a unified standard scheme, and the plane arrangement of the additional transverse steel bars in the additional steel bar mesh units can be changed according to the plane scheme, so that the position requirement of the variable-spacing studs during installation can be met, and the position conflict with the studs is avoided.
The construction method comprises the following steps:
the invention relates to an assembled steel-concrete composite floor system adopting precast slabs with no ribs at the slab ends, which comprises the following construction methods: a platform precast slab (1) is precast at the end of a factory, a platform precast slab (8) is precast at the four sides of the intersection of the two-direction combination beam, and a step-shaped platform (3) is arranged along the width of the slab or the length of the slab; hoisting the precast slabs (1) and (8) on site, overlapping the slab ends on the upper flange of the steel beam (6), and overlapping the side platform (10) of the precast slab (8) on the steel beam (9) in the other direction; placing an additional reinforcing steel bar mesh unit (4) on the stepped platform (3) formed by the precast slabs, wherein the overhanging part of the additional reinforcing steel bar mesh unit (4) spans the steel beam and is anchored into the floor slab support; and binding post-cast layer steel bar meshes and installing the post-cast layer steel bar meshes in place, and pouring upper concrete (5) by taking the precast slabs (1) and (8) and the steel beams (6) and (9) as templates to form the concrete laminated slab.
The patent provides a superimposed sheet composite beam of vertical shear reinforcement and prefabricated plate separation, has solved the problem such as the overhanging beard muscle of traditional superimposed sheet composite beam prefabricated plate and the conflict of peg, the easy aversion of additional reinforcing bar. The prefabricated slab composite beam has the advantages that the longitudinal shear steel bars and the transverse steel bars in the prefabricated slab are independent and do not interfere with each other, the assembly degree of the composite beam of the laminated slab is improved, the on-site construction difficulty is reduced, the arrangement and the positioning of the additional steel bars are facilitated, the effective connection of the prefabricated slab, a post-cast layer and a steel beam is guaranteed, and the overall performance of the composite beam of the laminated slab is improved. The structure has the advantages of definite force transmission, reasonable stress, simple structure, convenient construction and good economical efficiency.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120142.XU CN210622062U (en) | 2019-01-23 | 2019-01-23 | Longitudinal shear-resistant steel bar and precast slab separated laminated slab composite beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920120142.XU CN210622062U (en) | 2019-01-23 | 2019-01-23 | Longitudinal shear-resistant steel bar and precast slab separated laminated slab composite beam |
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| CN210622062U true CN210622062U (en) | 2020-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881833A (en) * | 2019-01-23 | 2019-06-14 | 清华大学 | Laminated slab composite beam with longitudinal shear reinforcement and precast slab separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881833A (en) * | 2019-01-23 | 2019-06-14 | 清华大学 | Laminated slab composite beam with longitudinal shear reinforcement and precast slab separation |
| CN109881833B (en) * | 2019-01-23 | 2024-01-30 | 清华大学 | Superimposed sheet composite beam with longitudinal shear steel bars and precast slabs separated |
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Granted publication date: 20200526 |