CN216949000U - Prestressed thin plate with concrete ribs and laminated slab - Google Patents
Prestressed thin plate with concrete ribs and laminated slab Download PDFInfo
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- CN216949000U CN216949000U CN202122626303.2U CN202122626303U CN216949000U CN 216949000 U CN216949000 U CN 216949000U CN 202122626303 U CN202122626303 U CN 202122626303U CN 216949000 U CN216949000 U CN 216949000U
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Abstract
The utility model discloses a prestressed thin plate with concrete ribs and a laminated slab, wherein the prestressed thin plate comprises a prestressed bottom plate and at least two combined trusses fixedly arranged on the upper surface of the prestressed bottom plate, each combined truss comprises a steel bar framework and a spiral stirrup, each steel bar framework comprises an upper chord and a web member, each spiral stirrup is sleeved on the upper chord, and the bottom of each web member is anchored in the prestressed bottom plate; the spiral stirrups and the upper chord are wrapped by concrete to form a concrete rib, a plurality of prestressed reinforcements and common reinforcements are anchored in the prestressed bottom plate, and the direction of the concrete rib is parallel to the prestressed reinforcements. The laminated slab comprises the prestressed thin plate with the concrete ribs and a cast-in-place layer, wherein the cast-in-place layer covers the top side surface of the prestressed thin plate, and the tops of the concrete ribs and the web members are anchored in the cast-in-place layer. The prestressed thin plate with the concrete ribs has reasonable integral rigidity, and the prestressed thin plate is prevented from arching downwards; the number of supports needed by the bottom of the laminated slab is reduced, and the construction and installation efficiency is high.
Description
Technical Field
The utility model belongs to the technical field of prefabricated parts, and particularly relates to a prestressed thin plate with concrete ribs and a laminated slab.
Background
The prestressed laminated slab is a prestressed slab produced by using prestressed steel bars as stressed reinforcing bars and adopting a pretensioning method in a factory. The prestressed laminated slab has obvious advantages compared with the common truss steel bar laminated slab, and the prestressed steel bar has high tensile strength, so that the steel bar consumption can be saved and the cost can be reduced compared with the common steel bar; the second prestressed laminated slab is produced by adopting a pretensioning method, namely, the prestressed reinforcement is tensioned in a factory in advance, the prestressed reinforcement is tensioned after the concrete reaches the strength, and the prefabricated bottom plate does not crack due to the prestress of the prestressed reinforcement after tensioning on the prefabricated bottom plate; the span of the three common steel bar framework composite floor slabs is less than 6m, the span of the prestressed composite slab can reach more than 8.4m, the prestressed composite slab can be suitable for large-space buildings, and meanwhile, the number of required floor slabs under the same building area is small, and the hoisting times are few.
However, also in the production phase prestressed laminated slabs, downward arching of the prestressed laminated slabs due to insufficient rigidity of the prefabricated floor is often observed, causing irreparable quality problems. Therefore, when the prestressed composite slab is thin, a rib is usually added on the prefabricated bottom plate to improve the overall rigidity, for example, patent CN101922190 proposes a method for producing a prestressed slab with a concrete rib, although the concrete rib does not need to form a rib and a hole of the rib through a supporting die and pre-embedded foam, when the method is used for production, a plurality of prefabricated blocks need to be used for assembly, the prefabricated blocks are often too large, meanwhile, the number of prefabricated blocks required by one composite slab is large, and the prefabricated bottom plate cannot be too thin, so that the method is simplified compared with a common production method, but the problems of long production time, complex production process, easy quality occurrence in production and the like still exist.
In summary, it is desirable to provide a prestressed thin slab and a laminated slab with concrete ribs, which have reasonable overall rigidity, small thickness of the prefabricated floor slab and high cost, so as to solve the technical problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the prestressed thin plate with the concrete ribs and the laminated slab have the advantages of reasonable overall rigidity, small thickness of the prefabricated floor slab and high cost, and are used for solving the technical problems in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a prestressed thin plate with concrete ribs comprises a prestressed bottom plate and at least two combined trusses fixedly arranged on the upper surface of the prestressed bottom plate, wherein each combined truss comprises a steel reinforcement framework and a spiral stirrup, each steel reinforcement framework comprises an upper chord and a web member, each spiral stirrup is sleeved on the upper chord, and the bottom of each web member is anchored in the prestressed bottom plate; the spiral stirrups and the upper chord are wrapped by concrete to form a concrete rib arranged outside the prestressed base plate, a plurality of prestressed reinforcements and common reinforcements are anchored in the prestressed base plate, and the length direction of the concrete rib is parallel to the length direction of the prestressed reinforcements.
On the basis of the above solution, in another improved solution, the tendon is placed above the bottom of the web member.
On the basis of the scheme, in another improved scheme, the two web members are simultaneously fixed on the upper chord member, and the bottoms of the two web members are anchored in the prestressed bottom plate.
On the basis of the scheme, in another improved scheme, the common steel bars are perpendicular to the prestressed steel bars.
On the basis of the scheme, in another improved scheme, the thickness of the prestressed base plate is 35mm or less.
On the basis of the scheme, in another improved scheme, the interval between two adjacent concrete ribs is not more than 600 mm.
On the basis of the scheme, in another improved scheme, the distance between the concrete rib arranged on the side edge of the prestressed bottom plate and the side edge of the prestressed bottom plate is not more than 300 mm.
The utility model also provides a composite slab, which comprises the prestressed thin slab with the concrete rib and a cast-in-place layer, wherein the cast-in-place layer covers the top side surface of the prestressed thin slab, and the tops of the concrete rib and the web member are anchored in the cast-in-place layer.
On the basis of the scheme, in another improved scheme, distribution steel bars are laid in the cast-in-place layer, penetrate through the steel bar framework and are perpendicular to the concrete ribs.
The technical scheme of the utility model has the following beneficial technical effects:
1. according to the prestressed thin plate with the concrete ribs, the concrete ribs are arranged, so that the overall rigidity of the prestressed thin plate is effectively improved, and the prestressed thin plate is prevented from arching downwards in the production stage; the spiral stirrup and a part of the steel reinforcement framework are anchored in the concrete to form a concrete rib, and the performance of the concrete rib is effectively improved due to the constraint effect of the spiral stirrup; due to the pre-pressing action on the concrete after the prestressed reinforcement is tensioned, the prestressed thin plate does not crack; and the prestressed bottom plate can reduce the thickness to below 35mm, effectively reduce the thickness, lighten the weight, increase the number of transportation layers, and greatly improve the transportation efficiency and the hoisting speed. The concrete rib of the utility model has a relatively simple production mode, mainly because: the materials used in the first step, such as the steel bar framework, the spiral stirrups and the concrete, are all general materials in the market, and the purchase or the self-production is convenient; the second production process is simple and has no complicated steps from the beginning to the end of production.
2. According to the laminated slab, the integral rigidity of the prestressed thin slab is high, so that the number of supports required by the bottom is reduced during field construction, and the construction and installation efficiency is high; the space between the upper chord member and the web member of the steel reinforcement framework facilitates the later stage pipeline passing or steel bar laying. Because the prestressed bottom plate is thin, the bidirectional plate can be formed by densely splicing; the bidirectional force transmission is applied to high-rise shear wall structure houses, so that the axial compression ratio of the shear wall can pass checking calculation; because the span of the slab is large, and no beam is arranged on the slab, the partition and the modification of the house type can be carried out according to the requirements of different periods, and the slab is a core product of a changeable house; the PC comprehensive unit price is high, the thickness of the prestressed bottom plate is small, the prefabrication amount is reduced, in addition, the hoisting and conveying efficiency is improved, and the comprehensive cost of the laminated slab can be obviously reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic structural view of a prestressed thin plate in example 1;
FIG. 2 is a schematic structural view of a composite girder according to embodiment 1;
fig. 3 is a schematic structural view of a reinforcing cage in example 1;
FIG. 4 is a schematic view showing the structure of a spiral stirrup in example 1;
fig. 5 is a schematic structural view of a concrete rib in example 1.
Reference numerals:
1-prestressed bottom plate 2-concrete rib 3-prestressed reinforcement
4-spiral stirrup 5-upper chord member 6-web member
7-combined truss
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
Example 1
Referring to the schematic drawings of fig. 1 to 5, the embodiment is a prestressed thin plate with concrete ribs 2, and the prestressed thin plate includes a prestressed bottom plate 1 and at least two combined trusses 7 fixedly arranged on the upper surface of the prestressed bottom plate 1, each combined truss 7 includes a steel bar framework and a spiral stirrup 4, the steel bar framework includes an upper chord 5 and a web member 6, the spiral stirrup 4 is sleeved on the upper chord 5, and the bottom of the web member 6 is anchored in the prestressed bottom plate 1; the spiral stirrup 4 and the upper chord 5 are wrapped by concrete to form a concrete rib 2 arranged outside the prestressed bottom plate 1, a plurality of prestressed reinforcements 3 and common reinforcements are anchored in the prestressed bottom plate 1, and the length direction of the concrete rib 2 is parallel to the length direction of the prestressed reinforcements 3. By arranging the concrete ribs 2, the overall rigidity of the prestressed thin plate is effectively improved, and the prestressed thin plate is prevented from arching downwards in the production stage; the spiral stirrup 4 and a part of the steel reinforcement framework are anchored in concrete to form the concrete rib 2, and the performance of the concrete rib 2 is effectively improved due to the constraint effect of the spiral stirrup 4.
In the embodiment, the steel bar truss is used as a steel bar framework, a finished steel bar truss product can be purchased or processed and produced by self, and the spiral stirrup 4 is also a common product; in other embodiments, the steel bar framework can be formed by welding section steels. The shape of the concrete rib 2 in this scheme is not limited to a cuboid, a cube, or a cylinder.
On the basis of the above described embodiment, in a further improved embodiment, the tendon is placed above the bottom of the web member 6. That is, the bottom of the steel reinforcement framework is arranged at the bottommost layer in the prestressed bottom plate concrete, the prestressed steel bar 3 is arranged at the topmost layer in the prestressed bottom plate concrete, the prestressed steel bar and the prestressed bottom plate concrete are both anchored in the prestressed bottom plate concrete, and the surface of the prestressed bottom plate concrete is wrapped by a concrete protection layer with a certain thickness.
Referring to the illustrations of fig. 2 and 3, in a further modified embodiment, on the basis of the above embodiment, two web members 6 are simultaneously fixed to the upper chord 5, the bottoms of both web members 6 being anchored in the prestressed bottom plate 1. In the embodiment, the web members 6 are made of wave ribs, the tops of the two wave ribs are welded and fixed below the upper chord 5, and the included angle between the two wave ribs is 30-90 degrees. Holes between the wave ribs and the upper chord 5 facilitate later pipeline passing or steel bar laying; in other embodiments, a plurality of short steel bars can be selected to form the web member 6, the tops of the plurality of sections of steel bars are welded and fixed below the upper chord 5, and the bottoms of the plurality of sections of steel bars are anchored in the prestressed plate.
On the basis of the above described embodiment, in a further modified embodiment, the ordinary reinforcement bars are placed perpendicular to the prestressed reinforcement bars 3. This arrangement improves the overall strength of the prestressed floor 1.
On the basis of the above embodiment, in another modified embodiment, the thickness of the prestressed bottom plate 1 is 35mm or less. Due to the improvement effect of the concrete ribs 2 on the integral rigidity of the prestressed bottom plate 1, the thinnest prestressed bottom plate 1 can be produced to be 35mm in thickness, so that the cost of prefabrication production is reduced, and the transportation and hoisting efficiency is improved.
On the basis of the above embodiment, in another modified embodiment, the interval between two adjacent concrete ribs 2 is not more than 600 mm. This is calculated to ensure that the concrete ribs 2 have an optimum increasing effect on the overall stiffness of the prestressed floor 1.
On the basis of the above embodiment, in another modified embodiment, the concrete ribs 2 provided on the sides of the prestressed floor are not more than 300mm away from the sides of the prestressed floor. This ensures that the concrete ribs 2 are better anchored with the cast-in-place layer concrete poured on the upper surface of the prestressed floor 1.
Example 2
This embodiment is a composite slab, which includes a prestressed thin slab with concrete ribs 2 in embodiment 1 and a cast-in-place layer, wherein the cast-in-place layer covers the top surface of the prestressed thin slab, and the tops of the concrete ribs 2 and the web members 6 are anchored in the cast-in-place layer.
On the basis of the above embodiment, in another improved embodiment, the distribution steel bars are laid in the cast-in-place layer, and the distribution steel bars penetrate through the steel bar framework and are placed perpendicular to the concrete ribs 2.
The method for producing the laminated plate in this embodiment is briefly described:
first, the concrete rib 2 is produced. Screwing the spiral stirrup 4 into the upper chord 5 of the steel bar truss to form a combined truss 7 with the spiral stirrup 4; the combined truss 7 is turned over by 180 degrees, placed into a mold, and poured with concrete of specified thickness, so that the upper chord 5 and the spiral stirrups 4 are all wrapped in the concrete, the concrete rib 2 is formed after the concrete is cured and then taken out, and the shape of the concrete rib 2 is not limited to a cuboid, a cube or a cylinder.
Next, a prestressed thin plate is produced. Arranging a production side formwork, laying embedded parts, common steel bars and prestressed steel bars 3, placing concrete ribs 2 according to the interval and the quantity of design requirements, laying the bottom of a combined truss 7 on the production bench formwork, arranging the bottom of a web member 6 at the lowest part of a prestressed bottom plate 1, and then laying the prestressed steel bars 3 and the common steel bars to be positioned above the bottom of the web member 6; and tensioning the prestressed reinforcement 3, pouring concrete with the thickness not less than 35mm, releasing the prestressed reinforcement 3 after the concrete is cured to reach the strength required by the design, and shearing the prestressed reinforcement 3.
And finally, transporting and hoisting the prestressed thin plate to a construction designated position, building a side formwork, laying pipelines above the prestressed thin plate, and the like, pouring cast-in-place layer concrete, and removing the side formwork after the concrete is cured to reach the strength required by the design.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. The prestressed thin plate with the concrete ribs is characterized by comprising a prestressed bottom plate and at least two combined trusses fixedly arranged on the upper surface of the prestressed bottom plate, wherein each combined truss comprises a steel reinforcement framework and a spiral stirrup, the steel reinforcement framework comprises an upper chord and a web member which are fixedly connected, the spiral stirrups are sleeved on the upper chord, and the bottoms of the web members are anchored in the prestressed bottom plate; the spiral stirrups and the upper chord are wrapped by concrete to form a concrete rib arranged outside the prestressed base plate, a plurality of prestressed reinforcements and common reinforcements are anchored in the prestressed base plate, and the length direction of the concrete rib is parallel to the length direction of the prestressed reinforcements.
2. A prestressed thin slab with concrete ribs according to claim 1, characterized in that said tendons are placed above the bottoms of said web members.
3. A prestressed thin slab with concrete ribs as claimed in claim 2, wherein said two web members are fixed to said upper chord member at the same time, and the bottoms of both of said web members are anchored in said prestressed bottom slab.
4. A concrete-ribbed prestressed thin slab as claimed in claim 3, wherein said plain reinforcing steel bars are placed perpendicularly to said prestressed reinforcing steel bars.
5. A prestressed thin slab with concrete ribs according to any one of claims 1 to 4, wherein said prestressed base slab has a thickness of 35mm or less.
6. A prestressed thin slab with concrete ribs as claimed in claim 5, wherein the spacing between two adjacent concrete ribs is not greater than 600 mm.
7. A prestressed sheet with concrete ribs according to claim 6, wherein said concrete ribs provided on the side of said prestressed floor are spaced from the side of said prestressed floor by a distance of not more than 300 mm.
8. A composite slab comprising a prestressed thin slab with concrete ribs according to any one of claims 1 to 7 and a cast-in-place layer covering the top side surface of the prestressed thin slab, the concrete ribs and the tops of the web members being anchored in the cast-in-place layer.
9. A composite slab according to claim 8, wherein distribution steel is laid in the cast-in-place layer, the distribution steel passing through the reinforcement cage and lying perpendicular to the concrete ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122626303.2U CN216949000U (en) | 2021-10-29 | 2021-10-29 | Prestressed thin plate with concrete ribs and laminated slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122626303.2U CN216949000U (en) | 2021-10-29 | 2021-10-29 | Prestressed thin plate with concrete ribs and laminated slab |
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| Publication Number | Publication Date |
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| CN216949000U true CN216949000U (en) | 2022-07-12 |
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| CN202122626303.2U Active CN216949000U (en) | 2021-10-29 | 2021-10-29 | Prestressed thin plate with concrete ribs and laminated slab |
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