Support-free prestressed laminated slab with prefabricated I-shaped perforated ribs

Abstract

The utility model discloses a support-free pre-stressed laminated slab with prefabricated I-shaped perforated ribs, which comprises a bottom plate and an upper laminated layer, the bottom plate comprises a horizontal reinforcing mesh, the prefabricated I-shaped perforated ribs placed on the reinforcing mesh and cold-formed thin-walled C-shaped steel for replacing a traditional steel bar truss, wherein the horizontal reinforcing mesh is composed of longitudinal prestressed tendons and transverse common steel bars, holes are formed in the corresponding positions of the I-shaped perforated ribs and the cold-formed thin-walled C-shaped steel, and a cast-in-place concrete layer with a certain height is poured on the upper portion of the bottom plate. Due to the fact that the mode of prefabricating the I-shaped perforated ribs and the profile steel is adopted, the rigidity of the laminated slab bottom plate is enhanced, meanwhile, the production process is simplified, the production efficiency is improved, the defect that pipelines are not prone to being inserted into a common concrete rib laminated slab in a penetrating mode is overcome, and the anti-cracking capacity of the laminated slab is improved due to the fact that prestress is added. In addition, the bottom plate is high in supporting-free capacity, temporary supporting can be achieved without construction workers, the construction period is shortened, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of construction, in particular to a prefabricated I-shaped perforated rib prestressed composite board without a support belt. Background Art

[0002] With the acceleration of my country's urbanization process and the proposal of the goals of "carbon peak" and "carbon neutrality", traditional construction methods are difficult to meet the requirements of rapid construction, high efficiency and energy saving, and resource recycling. Prefabricated buildings have become an effective solution to meet this demand because they can be built quickly, reduce material waste and environmental pollution. At present, the composite floor slabs widely used in prefabricated concrete structure projects are reinforced truss composite slabs. This type of composite slab has better integrity than the fully prefabricated slabs, and is more convenient, faster, and greener than cast-in-place slabs.

[0003] However, in the actual application of reinforced truss concrete composite slabs, many problems were found, such as high steel content, heavy steel binding workload in the factory; concrete cracks are easy to form during transportation; a support is required every 1.5 to 2 meters during construction, and the span without support is small, etc. Even though some composite slabs with concrete ribs appeared later, which increased the rigidity of the composite slabs, the concrete ribs made the formwork of the bottom plate more difficult, the production efficiency of the composite slabs was reduced, and the solid rectangular concrete rib composite slabs were not easy to insert pipelines.

[0004] After research, the inventor proposed a new type of support-free prestressed composite plate with prefabricated I-shaped perforated ribs. This composite plate uses cold-bent thin-walled C-shaped steel to replace the steel truss, and places it together with the prefabricated I-shaped perforated ribs on the tied horizontal steel mesh with prestressed tendons, and then casts them together with the steel mesh to form a prefabricated bottom plate with prefabricated I-shaped perforated ribs. This new type of support-free prestressed composite plate with prefabricated I-shaped perforated ribs strengthens the rigidity and crack resistance of the composite plate bottom plate, increases the production efficiency of the composite plate, speeds up the construction speed, and saves construction costs. Summary of the invention

[0005] The utility model aims to overcome the deficiencies of the prior art and to provide a prestressed composite plate with prefabricated I-shaped perforated ribs which is support-free and has high production and processing efficiency, excellent performance, convenient transportation, low construction cost, large support-free span, and convenient pipeline insertion.

[0006] The utility model provides the following technical solutions: a prefabricated I-shaped perforated rib prestressed composite board without support belt, comprising a bottom plate and a composite layer;

[0007] The bottom plate is formed by pouring bottom plate concrete with horizontal steel mesh, prefabricated I-shaped perforated ribs, and cold-bent thin-walled C-shaped steel. The prefabricated I-shaped perforated ribs and cold-bent thin-walled C-shaped steel are placed on the horizontal steel mesh. The horizontal steel mesh includes transverse common steel bars and longitudinal prestressed tendons placed thereon. The longitudinal prestressed tendons and transverse common steel bars are tied together by steel wire after the prestressed tendons are tensioned. The cross-section of the prefabricated I-shaped perforated rib is I-shaped, and the upper surface of the lower flange is flush with the upper surface of the bottom plate.

[0008] Two longitudinal stress-bearing steel bars are respectively arranged in the upper and lower flanges of the prefabricated I-shaped opening rib, and transverse anchoring steel bars for anchoring with the bottom plate are arranged on the longitudinal stress-bearing steel bars of the lower flange, and the longitudinal stress-bearing steel bars of the lower flange and the transverse anchoring steel bars are tied and fixed by steel bar tying wires;

[0009] The laminated layer is a cast-in-place concrete layer located on the bottom plate, an upper layer of steel mesh is embedded in the laminated layer, and the upper layer of steel mesh is placed on prefabricated I-shaped perforated ribs and cold-bent thin-walled C-shaped steel.

[0010] Preferably, at least two prefabricated I-shaped perforated ribs and two cold-bent thin-walled C-shaped steels are placed on the bottom plate.

[0011] Preferably, the longitudinal prestressed tendons of the horizontal steel mesh are 1570 grade stress-relieving spiral rib steel wires, and the transverse ordinary steel bars are HRB400 steel bars.

[0012] Preferably, the longitudinal stress-bearing steel bars in the upper and lower flanges of the prefabricated I-shaped perforated rib extend out of both ends of the prefabricated I-shaped perforated rib by at least 50 mm, and the transverse anchoring steel bars extend out of the two side surfaces of the prefabricated I-shaped perforated rib by 50-100 mm.

[0013] Preferably, the prefabricated I-shaped perforated rib is evenly provided with holes of length 100-200 mm at a position where the web is higher than the concrete surface of the bottom slab and lower than the lower surface of the upper flange, and the hole spacing is 100-200 mm.

[0014] Preferably, the prefabricated I-shaped perforated ribs are arranged along the long side direction of the base plate and the rib length does not exceed the base plate length, but the length of the longitudinal stress-bearing steel bars in the upper and lower flanges of the prefabricated I-shaped perforated ribs needs to exceed the base plate length by a certain distance.

[0015] Preferably, the length of the cold-bent thin-walled C-shaped steel is the same as the length of the prefabricated I-shaped perforated rib, and holes are opened on the steel wall corresponding to the opening positions of the prefabricated I-shaped perforated rib, and the holes are used to insert pipelines.

[0016] Beneficial effects:

[0017] 1. Compared with the traditional cast-in-place slab, the utility model has the characteristics of saving construction templates, short construction period, less labor demand, low carbon and green environmental protection.

[0018] 2. The utility model has a large rigidity and is easy to transport because the bottom plate adopts the form of I-shaped perforated ribs and cold-bent thin-walled C-shaped steel.

[0019] 3. The utility model has a large support-free span. When the floor span is not more than 4.0m, temporary construction supports are not required, which facilitates construction, effectively shortens the construction period, and saves construction costs.

[0020] 4. The utility model adopts prestressed steel wire as the longitudinal steel bar in the horizontal steel mesh of the bottom plate, and its anti-cracking ability is stronger than that of the composite plate adopting ordinary steel bars.

[0021] 5. The utility model adopts prefabricated I-shaped perforated ribs and cold-bent thin-walled C-shaped steel. When making the bottom plate, the ribs and the steel can be directly placed on the horizontal steel mesh of the bottom plate, which makes the bottom plate formwork simple, the production efficiency is high, and the degree of modularization is high.

[0022] 6. Compared with the common composite slab with rectangular concrete ribs, the utility model has holes on the ribs and the steel sections, which facilitates the insertion of pipelines during the later construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the bottom plate of the prefabricated I-shaped perforated rib prestressed composite plate without support of the utility model;

[0024] Figure 2 This is a schematic diagram of the prefabricated I-shaped perforated rib of the utility model;

[0025] Figure 3 This is a schematic diagram of the cold-bent thin-walled C-shaped steel of the utility model;

[0026] Figure 4 It is a schematic plan view of the bottom plate of the prefabricated I-shaped perforated rib prestressed composite plate without support of the utility model;

[0027] Figure 5 It is a schematic cross-sectional view of the bottom plate of the prefabricated I-shaped perforated rib prestressed composite plate without support belt of the utility model;

[0028] In the figure: 1-longitudinal prestressed tendons; 2-transverse ordinary steel bars; 3-prefabricated I-shaped perforated ribs; 4-cold-bent thin-walled C-shaped steel; 5-longitudinal stress-bearing steel bars; 6-bottom slab concrete; 7-transverse anchoring steel bars; 8-holes. DETAILED DESCRIPTION

[0029] In order to further clearly demonstrate the practical content, features and advantages of the present invention, a clear and complete description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0030] The utility model provides a support-free prestressed composite slab with prefabricated I-shaped perforated ribs, comprising a base plate and a composite layer, wherein the base plate is formed by pouring 60mm thick base plate concrete 6 with a horizontal steel mesh with prestress, prefabricated I-shaped perforated ribs 3 vertically placed thereon and cold-bent thin-walled C-shaped steel 4.

[0031] The horizontal steel mesh is made of transverse common steel bars 2 and longitudinal prestressed steel bars 1 placed thereon, which are fixed by steel wire binding after prestressing. The transverse common steel bars 2 are made of HRB400 steel bars, and the longitudinal prestressed steel bars 1 are made of 1570 grade stress-relieving steel wire.

[0032] Two longitudinal stress-bearing steel bars 5 are respectively arranged in the upper and lower flanges of the prefabricated I-shaped perforated rib 3, and transverse anchoring steel bars 7 for anchoring with the base plate are arranged on the longitudinal stress-bearing steel bars 5 of the lower flange. The longitudinal stress-bearing steel bars 5 and the transverse anchoring steel bars 7 are fixed by steel wire binding. The longitudinal stress-bearing steel bars 5 of the upper and lower flanges extend 100 mm from both ends of the prefabricated I-shaped perforated rib beam and are fixed to the base plate formwork to prevent the ribs from slipping during the pouring of the base plate concrete. The transverse anchoring steel bars 7 extend 50 mm from the surface of both sides of the prefabricated I-shaped perforated rib 3.

[0033] The cold-bent thin-walled C-shaped steel 4 is in a rolled edge form, and its length is the same as that of the prefabricated I-shaped perforated rib 3. Both are evenly provided with holes 8 with a length of 150 mm and a spacing of 150 mm at a height higher than the concrete surface of the bottom plate and lower than the lower surface of the upper flange of the prefabricated I-shaped perforated rib 3.

[0034] A method for manufacturing a prefabricated I-shaped perforated rib composite plate without support, comprising the following steps:

[0035] Step (1) is to install a mold for casting prefabricated I-shaped perforated ribs and apply a mold release agent. Then, the longitudinal stress-bearing steel bars of the upper and lower flanges of the prefabricated I-shaped perforated ribs and the transverse anchoring steel bars of the lower flange processed according to the design dimensions are placed in the mold for casting prefabricated I-shaped perforated ribs.

[0036] Step (2), fixing the longitudinal stress-bearing steel bars of the lower flange of the prefabricated I-shaped opening rib and the transverse anchoring steel bars of the lower flange by steel wire binding.

[0037] Step (3), pouring C40 concrete and vibrating it, and after curing and demoulding, it is made into a prefabricated I-shaped perforated rib beam. It should be noted that in order to enhance the anti-slip ability of the prefabricated rib, the side surface of the prefabricated rib is roughened before the concrete is finally set.

[0038] Step (4), install the mold for casting the base plate and apply a release agent, then place the processed base plate ordinary steel bars horizontally in the base plate mold, and then place the prestressed steel wire longitudinally in the base plate mold, and prestress the prestressed steel wire. When the tensioning control stress reaches the requirement, it is tied together with the base plate horizontal ordinary steel bars to form a prestressed steel mesh with horizontal belt of the base plate.

[0039] Step (5), transport the prefabricated I-shaped perforated rib and the pre-processed cold-bent thin-walled C-shaped steel to the top of the base plate mold by a gantry crane, and then place the two on the transverse steel bars in the horizontal steel mesh of the base plate at corresponding positions, and fix the rib on the base plate mold through the longitudinal stress-bearing steel bars on the flange of the prefabricated I-shaped perforated rib.

[0040] Step (6), pour the C40 concrete of the base plate and vibrate it. When vibrating, pay attention to vibrate back and forth several times under the steel mesh to prevent voids. The upper surface of the base plate should be roughened before the concrete is finally set. When the concrete strength reaches the release requirement, prestressing is released. When the concrete strength reaches the demoulding requirement, the concrete is demoulded and finally transported to the yard for further curing.

[0041] Step (7), transport the prefabricated base plate to the predetermined position of the construction site for installation. When the span of the floor slab is less than the support-free length, no temporary support is set. Then, the bound composite layer steel mesh is placed on the ribs and the steel sections. Finally, the composite layer C40 concrete is poured and vibrated to form a composite plate structure. After the maintenance is completed, the manufacture of the new type of support-free prefabricated I-shaped perforated rib prestressed composite plate is completed.

[0042] The above is a specific implementation mode of the present utility model. It should be pointed out that the present utility model is not limited to the above specific implementation mode. The above specific implementation mode is illustrative. For ordinary technicians in this technical field, without departing from the principles described in the present utility model, several modifications, equivalent substitutions, improvements, etc. can be made. These modifications, equivalent substitutions, and improvements should also be regarded as the protection scope of the present utility model.

Claims

1. A prefabricated I-shaped perforated rib prestressed composite plate without support belt, characterized in that: including a base plate and an overlay layer; The bottom plate is formed by pouring bottom plate concrete with horizontal steel mesh, prefabricated I-shaped perforated ribs, and cold-bent thin-walled C-shaped steel. The prefabricated I-shaped perforated ribs and cold-bent thin-walled C-shaped steel are placed on the horizontal steel mesh. The horizontal steel mesh includes transverse common steel bars and longitudinal prestressed tendons placed thereon. The longitudinal prestressed tendons and transverse common steel bars are tied together by steel wire after the prestressed tendons are tensioned. The cross-section of the prefabricated I-shaped perforated rib is I-shaped, and the upper surface of the lower flange is flush with the upper surface of the bottom plate. Two longitudinal stress-bearing steel bars are respectively arranged in the upper and lower flanges of the prefabricated I-shaped opening rib, and transverse anchoring steel bars for anchoring with the bottom plate are arranged on the longitudinal stress-bearing steel bars of the lower flange, and the longitudinal stress-bearing steel bars of the lower flange and the transverse anchoring steel bars are tied and fixed by steel bar tying wires; The laminated layer is a cast-in-place concrete layer located on the bottom plate, an upper layer of steel mesh is embedded in the laminated layer, and the upper layer of steel mesh is placed on prefabricated I-shaped perforated ribs and cold-bent thin-walled C-shaped steel.

2. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 1, characterized in that: At least two prefabricated I-shaped perforated ribs and two cold-bent thin-walled C-shaped steels are placed on the bottom plate.

3. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 2, characterized in that: The longitudinal prestressed steel bars of the horizontal steel mesh are 1570 grade stress-relieving spiral rib steel wires, and the transverse common steel bars are HRB400 steel bars.

4. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 3, characterized in that: The longitudinal stress-bearing steel bars in the upper and lower flanges of the prefabricated I-shaped perforated rib extend out of the two ends of the prefabricated I-shaped perforated rib by at least 50 mm, and the transverse anchoring steel bars extend out of the two side surfaces of the prefabricated I-shaped perforated rib by 50-100 mm.

5. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 4, characterized in that: The prefabricated I-shaped perforated rib is evenly provided with holes with a length of 100-200 mm at a position where the web is higher than the concrete surface of the bottom plate and lower than the lower surface of the upper flange, and the hole spacing is 100-200 mm.

6. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 5, characterized in that: The prefabricated I-shaped perforated ribs are arranged along the long side direction of the bottom plate and the rib length does not exceed the bottom plate length. The length of the longitudinal stress-bearing steel bars in the upper and lower flanges of the prefabricated I-shaped perforated ribs exceeds the bottom plate length.

7. The support-free prefabricated I-shaped perforated rib prestressed composite board according to claim 6, characterized in that: The length of the cold-bent thin-walled C-shaped steel is the same as the length of the prefabricated I-shaped perforated rib, and holes are opened on the steel wall corresponding to the opening positions of the prefabricated I-shaped perforated rib.

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