CN212743090U - Precast slab variable cross-section concrete laminated slab and precast slab - Google Patents
Precast slab variable cross-section concrete laminated slab and precast slab Download PDFInfo
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- CN212743090U CN212743090U CN202020869722.1U CN202020869722U CN212743090U CN 212743090 U CN212743090 U CN 212743090U CN 202020869722 U CN202020869722 U CN 202020869722U CN 212743090 U CN212743090 U CN 212743090U
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- 239000004567 concrete Substances 0.000 title claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000010276 construction Methods 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 17
- 238000007788 roughening Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 238000005488 sandblasting Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 4
- 239000011178 precast concrete Substances 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a precast slab variable cross section's concrete superimposed sheet and precast slab, precast slab variable cross section's concrete superimposed sheet includes precast slab, post-cast layer reinforcing bar net and post-cast concrete layer, the precast slab is variable cross section concrete slab, the precast slab is thick at the regional thick thin and in the regional thick of striding of board end, post-cast layer reinforcing bar net interweaves with great ease to lay in the precast slab top, post-cast concrete layer pour in the precast slab top. According to the utility model discloses precast slab variable cross section's concrete superimposed sheet has that structural rigidity and bearing capacity are big, and is with low costs, advantage that economic benefits is good.
Description
Technical Field
The utility model relates to a building structure technical field, in particular to precast slab variable cross section's concrete superimposed sheet and precast slab.
Background
The concrete composite slab is in a floor slab structure form consisting of a layer of precast concrete slab and a layer of post-cast concrete. The precast slab is prefabricated in a factory, hoisted in place on site, used as a bottom die of a cast-in-place concrete layer, capable of self-supporting dead weight and construction load and free from a large number of templates and scaffolds. Meanwhile, the precast slab and the upper cast-in-place concrete layer are combined into a whole and work together, and the precast slab has higher integrity than a full precast slab. The use of the laminated slab in China is in a vigorous development period, and at present, the truss reinforced laminated slab is mainly used in China.
The truss steel bar laminated slab is mainly used because the rigidity of the precast slab cannot meet the requirement, and the truss steel bars are arranged on the precast slab to enhance the rigidity of the precast slab, so that the truss steel bar laminated slab is formed. However, the size of the truss steel bars is limited by the integral thickness of the floor slab, the size of the truss steel bars is difficult to be large, the truss steel bars are higher than the prefabricated slab by a very limited height, and the contribution of the truss steel bars to the rigidity of the prefabricated slab is very limited, so if the rigidity of the prefabricated slab is improved to the rigidity required before superposition by the truss steel bars, a large amount of truss steel bars need to be arranged, and the arrangement of the truss steel bars can increase the steel bar consumption of the floor slab by 3-6 kg per square meter. The effect of the truss reinforcement on the floor after the truss reinforcement is overlapped is very small, so that the arrangement of a large number of truss reinforcements causes the waste of the reinforcement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a precast slab variable cross section's concrete superimposed sheet, structural rigidity and bearing capacity are big, and are with low costs, advantage that economic benefits is good.
Another object of the present invention is to provide a prefabricated panel, which has the advantage of high structural rigidity.
According to the utility model discloses precast slab variable cross section's concrete superimposed sheet, precast slab variable cross section's concrete superimposed sheet includes precast slab, post-cast layer reinforcing bar net and post-cast concrete layer, the precast slab is variable cross section concrete slab, the precast slab is thin and thick at the regional thick plate of striding of plate end region board thickness, post-cast layer reinforcing bar net interweaves with great ease to be laid in the precast slab top, post-cast concrete layer pour in the precast slab top.
According to the utility model discloses precast slab variable cross section's concrete superimposed sheet strides the regional thickness through increasing the precast slab, can effectively improve precast slab bulk stiffness, reduces the amount of deflection under the construction stage. The thickness of the plate in the plate end area is thin, so that the thickness proportion of the cast-in-place layer can meet the standard requirement. The utility model discloses can effectively improve the integral rigidity and the bearing capacity of prefabricated plate under the construction stage under the prerequisite that does not improve the material quantity, guarantee simultaneously that superimposed sheet's wholeness does not receive the weakening, satisfy the demand under the normal use.
In addition, according to the above embodiments of the present invention, the following additional technical features may also be provided:
in some embodiments, the thickness of the concrete plate in the midspan area of the precast slab is greater than the thickness of the concrete plate in the end area of the precast slab, and the thickness of the concrete plate in the midspan area of the precast slab is less than the overall thickness of the laminated slab. The structural rigidity of the precast slabs is increased by increasing the slab thickness of the area in the precast slab span under the condition of ensuring that the use amount of the precast slab is not increased. The thickness of the middle-span area of the precast slab is controlled to be smaller than the whole thickness of the laminated slab, so that the thickness of the post-cast layer meets the specification, and the stress and the integrity of the laminated slab cannot be influenced by the thickness proportion of the precast layer and the cast-in-place layer of the laminated slab.
In some embodiments, the thickness of the midspan region of the precast slab is determined by calculation of stiffness requirements at the construction stage, and the thickness of the slab end region of the precast slab is determined by integrity control requirements. The requirements of the prefabricated slab on the rigidity in the construction stage and the integrity of the laminated slab are ensured by controlling the thicknesses of the span-middle area and the end area of the prefabricated slab respectively.
In some embodiments, the variable cross-section position of the precast slab is in the range of 1/10-1/3 from the slab end. The position of the variable cross section of the precast slab is the transition position from the slab end area to the span-middle area of the precast slab, and the rigidity requirement under different construction stages can be ensured by controlling the proportion of the span-middle area to the slab end area on the precast slab.
In some embodiments, the bottom of the prefabricated slab is in the same plane, the thickness change is carried out on the top surface of the prefabricated slab, and the right-angle surface transition or the slope surface transition can be adopted at the variable cross section.
In some embodiments, the surface of the precast slab has a surface structure that is subjected to a surface roughening treatment, such as roughening and sand blasting, to increase the tensile and shear strength between the precast slab and the post-cast concrete layer;
bent steel bars or angular steel bars are arranged in the plate end area of the precast slab, and can be used as a precast slab lifting hook and further increase the strength of a joint surface of the precast slab and post-cast concrete.
According to another object of the present invention, the prefabricated panel has a thickness greater in the mid-span region than in the end region.
According to the utility model discloses the prefabricated plate is through increasing the thick board of middle zone, can effectively improve the overall structure rigidity of prefabricated plate, reduces the amount of deflection under the construction stage to make post-cast layer thickness proportion satisfy the standard when can guaranteeing to be applied to the superimposed sheet.
The advantages brought by the additional aspects of the precast slab and the concrete composite slab with a variable cross section according to the embodiment of the present invention will be described in detail in the following detailed description.
Drawings
Fig. 1 is a perspective view of a concrete composite slab with a variable cross section of a prefabricated slab according to an embodiment of the present invention.
Fig. 2 is a partial cross-sectional view of a concrete composite slab with a variable cross-section of a prefabricated slab according to an embodiment of the present invention.
Reference numerals:
the prefabricated slab variable cross-section concrete composite slab 100, the prefabricated slab 10, the post-cast layer steel bar mesh 20, the post-cast concrete layer 30, the slab end area 1, the midspan area 2, the beard rib 3 and the prefabricated beam 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the related art, a concrete composite slab is a floor slab structure composed of a precast concrete slab and a post-cast concrete slab. The precast slab is prefabricated in a factory, hoisted in place on site, used as a bottom die of a cast-in-place concrete layer, capable of self-supporting dead weight and construction load and free from a large number of templates and scaffolds. Meanwhile, the precast slab and the upper cast-in-place concrete layer are combined into a whole and work together, and the precast slab has higher integrity than a full precast slab.
The concrete composite slab 100 with a variable cross-section of the prefabricated panel according to the embodiment of the present invention will be described in detail with reference to fig. 1 and 2. The concrete composite slab 100 can be applied to the construction of various building scenes such as urban buildings, residential buildings, commercial buildings, and the like.
The laminated slab 100 comprises a precast slab 10, a post-cast layer steel bar mesh 20 and a post-cast concrete layer 30, wherein the precast slab 10 is a variable cross-section concrete slab, the precast slab 10 is thin in slab thickness in a slab end area 1 and thick in slab thickness in a midspan area 2, the post-cast layer steel bar mesh 20 is criss-cross laid above the precast slab 10, and the post-cast concrete layer 30 is poured above the precast slab 10. Note that "above" and "below" in the above can refer to the up-down direction in fig. 1. The mid-span region 2 of the prefabricated panel 10 refers to the middle region of the prefabricated panel 10, and the panel end region 1 of the prefabricated panel 10 refers to the panel end region or the seating region of the prefabricated panel 10, in other words, the regions of opposite ends of the prefabricated panel 10.
According to the utility model discloses precast slab 10 variable cross section's concrete superimposed sheet 100, through increasing precast slab 10 and striding the thickness of middle zone 2, can effectively improve precast slab 10 bulk stiffness, reduce the amount of deflection under the construction stage. The thickness of the plate in the plate end area 1 is thin, so that the thickness ratio of the cast-in-place layer can meet the standard requirement. The utility model discloses can effectively improve the holistic rigidity and the bearing capacity of prefabricated plate 10 under the construction stage under the prerequisite that does not improve the material quantity, guarantee simultaneously that superimposed sheet's wholeness does not receive the weakening, satisfy the demand under the normal use.
It should be noted that, compared with the technical means of raising the stiffness of the precast slab to the stiffness required before the precast slab is stacked by the truss steel bars in the prior art, it is obvious that simply increasing the thickness of the precast slab contributes to improving the stiffness and strength of the concrete precast slab, but according to the 6.6.2 th regulation in the technical specification of prefabricated concrete structure (JGJ1-2014), the thickness of the post-cast concrete stacked layer of the stacked slab should not be less than 60mm, and under the condition that the overall thickness of the stacked slab is not changed, increasing the thickness of the precast slab tends to reduce the thickness of the post-cast concrete layer 30, thereby reducing the overall thickness of the floor slab. Therefore, under the condition of ensuring that the whole thickness proportion of the prefabricated layer and the cast-in-place layer of the laminated slab is not changed, the strength of the concrete laminated slab is increased by controlling the variable cross section form of the prefabricated slab 10, and the whole thickness is not changed. Further, in a normal case, the mid-span region 2 of the concrete composite slab is subjected to a positive bending moment, the plate end region 1 is subjected to a negative bending moment, the mid-span region 2 of the concrete composite slab can be adjusted to be thicker, and the plate end region 1 can be adjusted to be thinner, so that the purpose can be achieved.
Referring to fig. 2, the thickness of the concrete at the midspan region 2 of the precast slab 10 is greater than that at the slab end region 1 of the precast slab 10, and the thickness of the concrete at the midspan region 2 of the precast slab 10 is less than the overall thickness of the laminated slab. The structural rigidity of the prefabricated panel 10 is increased by increasing the panel thickness in the region across the prefabricated panel 10 while ensuring that the amount of laminated panel material is not increased. The thickness of the plate in the area of the span of the precast slab 10 is controlled to be smaller than the whole thickness of the laminated slab, so that the thickness of the laminated slab meets the specification, and the stress and the integrity of the laminated slab cannot be influenced by the thickness ratio of the precast layer to the cast-in-place layer of the laminated slab.
Referring to fig. 2, the thickness of the precast slab 10 across the center region 2 is determined by calculation of stiffness requirements at the construction stage, and the thickness of the slab end region of the precast slab 10 is determined by integrity control requirements. The requirements of rigidity of the precast slab 10 at the construction stage and the integrity of the laminated slab are ensured by controlling the thicknesses of the precast slab 10 across the middle region 2 and the slab end region 1, respectively. For example, the thickness of the floor slab with the thickness of 130mm, the thickness of the span region of the prefabricated slab 10 can be 80-90 mm. The thickness of the preformed sheet 10 in the end region 1 of the sheet is determined by the laminated sheet integrity requirement calculation and is typically 60 mm.
Referring to FIG. 2, the variable cross-sectional position of the prefabricated panel 10 is located within 1/10-1/3 of the panel end. The position of the variable section of the precast slab 10 is the position of the transition from the slab end region 1 to the span-middle region 2 of the precast slab 10, and the rigidity requirement at different construction stages can be ensured by controlling the ratio of the span-middle region 2 to the slab end region 1 on the precast slab 10.
With continued reference to FIG. 2, the prefabricated panels 10 are positioned at the bottom of the same plane, and the thickness variation is performed on the top surface of the prefabricated panels 10, and the variable cross-section can be implemented by right-angle surface transition or slope surface transition.
In the above embodiment, the surface of the prefabricated panel 10 has a surface structure that is subjected to a surface roughening process to increase tensile and shear strength between the prefabricated panel 10 and the post-cast concrete layer 30. Specifically, the surface of the prefabricated panel 10 has a surface structure that is surface-roughened by roughening or sand blasting.
In addition, bent-up or angle-shaped reinforcing bars may be disposed near the panel ends of the prefabricated panels 10 to further increase the tensile and shear strength of the overlapped surfaces.
The beard ribs 3 are arranged on the precast slabs 10, the beard ribs 3 extend out of the edges of two opposite sides of the precast slabs 10, and in the manufacturing process of the laminated slab 100, the beard ribs 3 of the precast slabs 10 are lapped on the precast beams 4, so that the on-site rapid installation is realized, the connection stability between a floor slab and a steel beam is improved, and the structure of the laminated slab is more reliable.
With reference to fig. 1 and 2, the present invention further provides a prefabricated panel 10, wherein the thickness of the prefabricated panel 10 in the midspan region 2 is greater than that of the prefabricated panel 10 in the panel end region 1.
According to the utility model discloses prefabricated plate 10 is through increasing the thick board of 2 in the middle-span region, can effectively improve prefabricated plate 10's overall structure rigidity, reduces the amount of deflection under the construction stage to make post-cast layer thickness proportion satisfy the standard when can guarantee to be applied to the superimposed sheet.
In summary, according to the utility model discloses prefabricated plate 10 and concrete superimposed sheet 100 to the not enough problem of prefabricated plate 10 rigidity of traditional superimposed sheet, according to superimposed sheet's atress principle and characteristic, the law is influenced by the curved member amount of deflection, has provided the superimposed sheet scheme of a prefabricated plate 10 variable cross-section. The influence of the cross-section rigidity of the bent member on the whole deformation is the largest, the integral rigidity of the prefabricated plate 10 can be effectively improved by increasing the thickness of the cross-middle area 2 of the prefabricated plate 10, the deflection at the construction stage is reduced, the thickness proportion of a cast-in-place layer of the prefabricated plate 10 meets the standard requirement by adopting a thinner thickness, and the integrity of a floor slab is ensured. The utility model discloses prefabricated plate 10 and concrete superimposed sheet 100 can effectively improve the holistic rigidity and the bearing capacity of prefabricated plate 10 under the construction stage under the prerequisite that does not improve the material quantity, guarantee simultaneously that superimposed sheet's wholeness does not receive the weakening, satisfy the demand under the normal use stage, have improved superimposed sheet's economic benefits.
The utility model is used for the floor of prefabricated building, the floor of here is concrete laminated slab, refers to fig. 1 and fig. 2, by becoming section concrete prefabricated plate 10, post-cast layer reinforcing bar net 20, post-cast concrete layer 30 constitutes. The problem that the rigidity of the existing prefabricated slab is not enough can be solved on the premise of protecting the integrity of the floor slab.
In the above embodiment, the total thickness of the floor slab, the thickness of each section of the precast slab 10, and the position of the section are designed according to the concrete conditions of the construction. The precast slabs 10 are processed and produced in a precast concrete component factory, maintained to the designed strength and are transported to a construction site after being ejected, assembled and put in place on the precast beam 4 or the precast wall by a crane and the like. And (3) binding the reinforcing mesh in the post-cast layer, which comprises the reinforcing mesh 20 of the post-cast layer on the precast beam 4 and the precast slab 10. And pouring post-cast layer concrete to ensure that the precast slabs 10, the precast beams 4 and the post-cast layer form a stable whole to work together.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (7)
1. The precast slab variable cross section concrete composite slab is characterized by comprising a precast slab, a post-cast layer steel bar mesh and a post-cast concrete layer, wherein the precast slab is a variable cross section concrete slab, the thickness of the precast slab at a slab end area is thinner, the thickness of the precast slab at a midspan area is thicker, the post-cast layer steel bar mesh is longitudinally and transversely interwoven and laid above the precast slab, and the post-cast concrete layer is poured above the precast slab.
2. The precast slab variable cross-section concrete composite slab as recited in claim 1, wherein a thickness of a concrete slab in the midspan area of the precast slab is greater than a thickness of a concrete slab in the end area of the precast slab, and the thickness of the concrete slab in the midspan area of the precast slab is smaller than the entire thickness of the composite slab.
3. The precast slab variable cross-section concrete composite slab as claimed in claim 1, wherein the thickness of the span-middle area of the precast slab is determined by calculation of stiffness requirement at the construction stage, and the thickness of the slab-end area of the precast slab is determined by the integrity control requirement.
4. The precast slab variable cross-section concrete composite slab as claimed in claim 1, wherein the variable cross-section position of the precast slab is located within a range of 1/10-1/3 from the slab end.
5. The concrete composite slab with the variable cross sections of the precast slabs as claimed in claim 1, wherein the bottom of the precast slabs is in the same plane, the thickness variation is carried out on the top surface of the precast slabs, and the variable cross sections can adopt right-angle surface or slope surface transition.
6. The precast slab variable cross-section concrete composite slab as recited in claim 1,
the surface of the prefabricated plate is provided with a surface structure subjected to surface roughening treatment;
the surface of the prefabricated plate is provided with a surface structure which is subjected to surface roughening treatment through roughening or sand blasting;
bent-up steel bars or angular steel bars are arranged near the plate ends of the precast plates.
7. A precast slab is characterized in that the thickness of the precast slab in a midspan region is larger than that of the precast slab in a slab end region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020869722.1U CN212743090U (en) | 2020-05-21 | 2020-05-21 | Precast slab variable cross-section concrete laminated slab and precast slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020869722.1U CN212743090U (en) | 2020-05-21 | 2020-05-21 | Precast slab variable cross-section concrete laminated slab and precast slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212743090U true CN212743090U (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020869722.1U Expired - Fee Related CN212743090U (en) | 2020-05-21 | 2020-05-21 | Precast slab variable cross-section concrete laminated slab and precast slab |
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| Country | Link |
|---|---|
| CN (1) | CN212743090U (en) |
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2020
- 2020-05-21 CN CN202020869722.1U patent/CN212743090U/en not_active Expired - Fee Related
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Granted publication date: 20210319 |