CN212358789U - Prefabricated composite bottom plate concrete superimposed sheet connection structure based on tongue-and-groove form - Google Patents
Prefabricated composite bottom plate concrete superimposed sheet connection structure based on tongue-and-groove form Download PDFInfo
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- CN212358789U CN212358789U CN202021939751.7U CN202021939751U CN212358789U CN 212358789 U CN212358789 U CN 212358789U CN 202021939751 U CN202021939751 U CN 202021939751U CN 212358789 U CN212358789 U CN 212358789U
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Abstract
A prefabricated composite bottom plate concrete laminated slab connecting structure based on a rabbet form is characterized in that the prefabricated composite bottom plate concrete laminated slab is composed of a prefabricated composite bottom plate and a top post-cast concrete layer, the side connecting portion of the side adjacent to the prefabricated composite bottom plate is in the rabbet form, rectangular steel plates are pre-embedded on the top and the bottom of the prefabricated composite bottom plate on the rabbet connecting side, the rectangular steel plates of the adjacent prefabricated composite bottom plates are welded through rectangular steel cover plates to form dry connection, stressed steel bars are laid above the prefabricated composite bottom plate, the post-cast concrete is poured to form the top post-cast concrete layer, and the whole plate is made into a whole. The invention adopts a hybrid connection technology, namely: the post-cast concrete layers in the composite slabs are connected in a wet mode, the prefabricated composite baseplates are connected in a dry mode, and the composite slabs are simple in structure, safe in structure, advanced in technology, simple and convenient to construct and rapid to build.
Description
Technical Field
The invention belongs to the technical field of buildings, relates to an assembled integral concrete laminated plate structure, and particularly relates to a prefabricated composite bottom plate concrete laminated plate connecting structure based on a tongue-and-groove form.
Background
The floor system is an important component in the building. In terms of stress, the floor serves as a horizontal bearing structure, the load on the floor is transferred to the vertical bearing component, and the floor and the vertical bearing structure form a space bearing framework of a building together to resist various load effects; in terms of economy, in the field of common civil buildings, the self weight of the floor system accounts for about 30-40% of the total weight of the building. Therefore, the floor system has important influence on the construction and normal use of the whole structure.
The prefabricated integral concrete structure is one of the structural forms mainly popularized by prefabricated buildings, and the laminated floor slab is used as an important component of the prefabricated integral concrete structure.
The concrete composite slab in the current engineering is limited by transportation conditions and hoisting capacity, is formed by splicing a plurality of prefabricated bottom plates, laying top steel bars on the prefabricated bottom plates, pouring a post-cast concrete layer, and adopting wet connection of post-cast strips among the splicing seams, has the advantages of good connection quality, capability of realizing bidirectional bending performance of a floor slab and the like, and is a composite slab connection technology mainly recommended by technical rules of prefabricated concrete structures (JGJ 1-2014). However, in this type of connection, a certain length of stressed steel bar is required to extend out of the precast slab side, and a cast-in-place strip with a certain width is arranged at the splicing position, so that a large amount of formwork supporting and steel bar binding work is still required to be carried out on the construction site, the construction speed is reduced, and the advancement of the assembly technology cannot be reflected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a prefabricated composite bottom plate concrete laminated slab connecting structure based on a tongue-and-groove form, which adopts a hybrid connecting technology, namely: the post-cast concrete layers in the composite slabs are connected in a wet mode, the prefabricated composite baseplates are connected in a dry mode (tongue-and-groove structure and welded connection), the structure is simple, the structure is safe, the technology is advanced, the construction is simple and convenient, and the construction is rapid.
In order to achieve the purpose, the invention adopts the technical scheme that:
a prefabricated composite bottom plate concrete laminated slab connection structure based on a rabbet form is characterized in that the prefabricated composite bottom plate concrete laminated slab is composed of a prefabricated composite bottom plate 4 and a top post-cast concrete layer 5, the side connection part of the side adjacent to the prefabricated composite bottom plate 4 is in the rabbet form 8, rectangular steel plates 1 are pre-embedded in the top and bottom of the prefabricated composite bottom plate 4 and located on the rabbet connection side, the rectangular steel plates 1 of the adjacent prefabricated composite bottom plate 4 are welded through rectangular steel cover plates 2 to form dry connection, stressed steel bars 3 are laid above the prefabricated composite bottom plate 4, and post-cast concrete is poured to form the top post-cast concrete layer 5, so that the whole slab is formed into a whole.
Preferably, the prefabricated composite bottom plate 4 comprises a prefabricated concrete bottom plate 41 internally provided with a plurality of autoclaved aerated concrete blocks 42, a steel bar truss 43 and a stressed steel bar net are arranged on the prefabricated concrete bottom plate 41, concrete among the autoclaved aerated concrete blocks 42 forms a longitudinal concrete rib 92 along the length direction and a transverse concrete rib 91 along the width direction after post-cast concrete pouring, and the rabbet form 8 of the prefabricated composite bottom plate 4 is arranged at the longitudinal concrete rib 92 of the plate edge.
Preferably, the outer surface of the rectangular steel plate 1 is flush with the upper surface or the lower surface of the prefabricated composite bottom plate 4, and the rectangular steel cover plate 2 is respectively welded to the outer surfaces of the top and bottom rectangular steel plates 1.
Preferably, two first-level steels with the diameter of 25mm are welded on the inner surface of the rectangular steel plate 1 to serve as anchor bars 6, and the anchor bars 6 extend out of the plate surface and are perpendicular to the vertical surface connected with the tongue-and-groove.
The invention also provides a construction method of the prefabricated composite bottom plate concrete composite slab connection structure based on the tongue-and-groove form, which comprises the following steps:
the method comprises the following steps: manufacturing a prefabricated composite bottom plate 4 with a tongue-and-groove form 8, wherein rectangular steel plates 1 are embedded in the top and bottom of the prefabricated composite bottom plate 4 at the tongue-and-groove connecting side, and the outer surfaces of the rectangular steel plates 1 are flush with the upper surface or the lower surface of the prefabricated composite bottom plate 4 respectively;
step two: hoisting the prefabricated composite bottom plates 4 to the specified positions of the building, welding the outer surfaces of the embedded rectangular steel plates 1 at the tops of the adjacent prefabricated composite bottom plates 4 by adopting the rectangular steel cover plates 2, and welding the outer surfaces of the embedded rectangular steel plates 1 at the bottoms of the adjacent prefabricated composite bottom plates 4;
step three: laying stress steel bars 3 above the prefabricated composite bottom plate 4, and pouring concrete to form a top post-cast concrete layer 5; and forming the prefabricated composite bottom plate concrete laminated slab in hybrid connection after the top rear pouring concrete layer 5 reaches the design strength.
Preferably, the step one comprises the steps of:
cleaning and clearing the steel structure mould; supporting and placing a lateral steel template according to the size of a designed test piece; brushing a concrete release agent; binding a reinforcing mesh in the prefabricated bottom plate, putting the bound reinforcing mesh into a supported template, and putting the rectangular steel plate 1 at the bottom into a specified position; after all the works are confirmed to be correct, pouring concrete with the thickness of 50 mm; and then placing the autoclaved aerated concrete block 42 soaked for 24 hours into a designed and appointed position, pouring 50mm of concrete, and placing the rectangular steel plate 1 at the top into an appointed position.
Preferably, when the reinforcing mesh is bound, the truss reinforcing steel bars are bound together with the bottom reinforcing mesh.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional integral joint wet connection of the laminated slab, the invention has the advantages that: the method can avoid the arrangement of a cast-in-place belt with a certain width at the splicing part, so that a large amount of work of template support and reinforcement binding still needs to be carried out on a construction site, and the industrial construction efficiency of the fabricated building is greatly improved;
2. the prefabricated composite bottom plates are connected by adopting a dry welding connection method, the process is relatively simple, the operation is easy, and meanwhile, the bidirectional stress performance of the formed plate is also ensured.
3. The prefabricated composite bottom plate with the embedded parts can realize normalization, unification and diversification of key parts so as to meet the diversified demands of different buildings, and has the advantages of ecological environmental protection, quick construction, economy, practicality and the like.
Drawings
FIG. 1 is a schematic view of the construction of a prefabricated composite floor concrete composite slab according to the present invention.
Fig. 2 is a schematic view of a tongue-and-groove type dry connection structure according to the present invention.
Fig. 3 is a schematic diagram of a dry connector according to the present invention.
FIG. 4 is a schematic view showing the position of the dry type connectors embedded in the prefabricated composite floor according to the present invention (top view)
Fig. 5 is an enlarged view (front view) of the area a in fig. 4.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention relates to a prefabricated composite bottom plate concrete laminated slab connection structure based on a tongue-and-groove form, which is shown in figure 1 and comprises a prefabricated composite bottom plate 4 and a top post-cast concrete layer 5, wherein the prefabricated composite bottom plate 4 comprises a prefabricated concrete bottom plate 41 internally provided with a plurality of autoclaved aerated concrete blocks 42, and a steel bar truss 43 and a stressed steel bar net are arranged on the prefabricated concrete bottom plate 41. Wherein, the concrete among the autoclaved aerated concrete blocks 42 forms a longitudinal concrete rib 92 along the length direction and a transverse concrete rib 91 along the width direction after post-cast concrete pouring, wherein L, B, H in the figure indicates the length, width and height of the single prefabricated composite bottom plate 4. The board side portions (i.e., board-to-board connection portions) of adjacent prefabricated composite bottom boards 4 are in the form of tongue-and-groove 8, and the tongue-and-groove 8 is provided at the concrete longitudinal ribs 92 of the board sides. The top post-cast concrete layer 5 comprises stressed steel bars 3 and post-cast concrete, and the stressed steel bars 3 are laid above the prefabricated composite bottom plate 4.
The connection structure comprises a dry connection structure and a wet connection structure. Wherein:
referring to fig. 2 and 3, the dry connecting structure comprises a rectangular steel plate 1 and a rectangular steel cover plate 2, and the prefabricated composite bottom plate concrete laminated slab mainly comprises a top post-cast concrete layer 5, a prefabricated concrete bottom plate 41 and concrete ribs formed among autoclaved aerated concrete blocks 42 as a bearing system under the action of vertical load. Therefore, for the convenience of dry connection, the rectangular steel plate 1 is pre-embedded at the top and bottom of the prefabricated composite bottom plate 4 at the tongue-and-groove connection side, wherein the outer surface (i.e. the upper surface) of the rectangular steel plate 1 at the top is flush with the top surface of the prefabricated composite bottom plate 4, and the outer surface (i.e. the lower surface) of the rectangular steel plate 1 at the bottom is flush with the bottom surface of the prefabricated composite bottom plate 4. The outer surfaces of the rectangular steel plates 1 at the top and bottom of the adjacent prefabricated composite bottom plates 4 are respectively welded through the rectangular steel cover plates 2, so that a dry connection is formed, and a welding surface 7 is shown in the figure. Effect after joining referring to fig. 4 and 5, the width of the laminated slab in fig. 4 can be represented as B × n, where n is the number of prefabricated composite bottom boards 4.
The rabbet form 8 and the dry-type connecting structure ensure the finishing and shearing resistance of the prefabricated composite bottom plate concrete composite slab, and can avoid slurry leakage when concrete is poured. In order to further enhance the connection effect, two first-level steels with the diameter of 25mm are welded on the inner surface of the rectangular steel plate 1 to serve as anchor bars 6, and the anchor bars 6 extend out of the plate surface and are perpendicular to the vertical surface connected with the tongue-and-groove.
The wet connection means that the rectangular steel cover plate 2 is poured together by adopting a method of paving the stressed steel bars 3 and pouring post-cast concrete on the top post-cast concrete layer 5, so that the whole plate is formed into a whole.
The invention also provides a construction method of the prefabricated composite bottom plate concrete composite slab connection structure based on the tongue-and-groove form, which comprises the following steps:
the method comprises the following steps: and manufacturing a prefabricated composite bottom plate 4 with a tongue-and-groove form 8, wherein rectangular steel plates 1 are embedded in the top and bottom of the prefabricated composite bottom plate 4 at the tongue-and-groove connecting side, and the outer surfaces of the rectangular steel plates 1 are flush with the upper surface or the lower surface of the prefabricated composite bottom plate 4 respectively.
Specifically, cleaning and clearing the steel structure mould; supporting and placing a side steel template according to the size of a designed test piece (adopting a special tongue-and-groove steel template for a side tongue-and-groove part); brushing a concrete release agent; binding a steel bar mesh in the prefabricated bottom plate (binding the truss steel bars and the bottom steel bar mesh together), putting the bound steel bar mesh into a supported template, and putting the rectangular steel plate 1 at the bottom into a specified position; after all the works are confirmed to be correct, pouring concrete with the thickness of 50 mm; then placing the autoclaved aerated concrete block 42 soaked for 24 hours into a designed and appointed position (for ensuring the adhesion between the autoclaved aerated concrete block and concrete), pouring 50mm concrete, placing the rectangular steel plate 1 at the top into the appointed position, and then tapping the aerated block by using a rubber hammer to keep the top surface height consistent; after the concrete is initially set, a wooden sawtooth brush is adopted to carry out artificial rough surface treatment on the exposed concrete surface so as to meet the rough surface requirement that the difference value of the concave and convex surfaces is more than or equal to 4mm, which is specified in 9.5.2 items of concrete structure design specifications.
Step two: hoisting the prefabricated composite bottom plates 4 to the specified positions of the building, welding the outer surfaces of the embedded rectangular steel plates 1 at the tops of the adjacent prefabricated composite bottom plates 4 by adopting the rectangular steel cover plates 2, and welding the outer surfaces of the embedded rectangular steel plates 1 at the bottoms of the adjacent prefabricated composite bottom plates 4;
step three: according to design requirements, stress steel bars 3 are laid above a prefabricated composite bottom plate 4, and after the situation that the stress steel bars are correct is confirmed, concrete is poured to form a top post-poured concrete layer 5; and forming the prefabricated composite bottom plate concrete laminated slab in hybrid connection after the top rear pouring concrete layer 5 reaches the design strength.
Claims (4)
1. A prefabricated composite bottom plate concrete laminated slab connection structure based on a groove and tongue form is composed of a prefabricated composite bottom plate (4) and a top post-cast concrete layer (5), and is characterized in that the side connection part of the adjacent prefabricated composite bottom plate (4) is in the groove and tongue form (8), rectangular steel plates (1) are embedded in the top and bottom of the prefabricated composite bottom plate (4) on the groove and tongue connection side, the rectangular steel plates (1) of the adjacent prefabricated composite bottom plate (4) are welded through rectangular steel cover plates (2) to form dry connection, stressed steel bars (3) are laid above the prefabricated composite bottom plate (4), and post-cast concrete is poured to form the top post-cast concrete layer (5), so that the whole slab is formed into a whole.
2. The precast composite floor concrete laminated slab connecting structure based on the tongue-and-groove form as claimed in claim 1, wherein the precast composite floor (4) comprises a precast concrete floor (41) in which a plurality of autoclaved aerated concrete blocks (42) are arranged, a steel bar truss (43) and a stressed steel bar mesh are arranged on the precast concrete floor (41), wherein concrete among the autoclaved aerated concrete blocks (42) forms a longitudinal concrete rib (92) along the length direction and a transverse concrete rib (91) along the width direction after post-cast concrete pouring, and the tongue-and-groove form (8) of the precast composite floor (4) is arranged at the longitudinal concrete rib (92) at the edge of the slab.
3. The structure for connecting precast composite floor concrete composite slabs based on the tongue-and-groove form as claimed in claim 1, wherein the outer surface of the rectangular steel plate (1) is flush with the upper surface or the lower surface of the precast composite floor (4), and the rectangular steel cover plate (2) is welded to the outer surfaces of the top and bottom rectangular steel plates (1), respectively.
4. The structure for connecting precast composite floor concrete composite slabs based on the tongue-and-groove form as claimed in claim 1, wherein two first-grade steels with a diameter of 25mm are welded on the inner surface of the rectangular steel plate (1) as the anchor bars (6), and the anchor bars (6) are protruded out of the plate surface and are perpendicular to the vertical surface of the tongue-and-groove connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021939751.7U CN212358789U (en) | 2020-09-08 | 2020-09-08 | Prefabricated composite bottom plate concrete superimposed sheet connection structure based on tongue-and-groove form |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021939751.7U CN212358789U (en) | 2020-09-08 | 2020-09-08 | Prefabricated composite bottom plate concrete superimposed sheet connection structure based on tongue-and-groove form |
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| CN212358789U true CN212358789U (en) | 2021-01-15 |
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| CN202021939751.7U Expired - Fee Related CN212358789U (en) | 2020-09-08 | 2020-09-08 | Prefabricated composite bottom plate concrete superimposed sheet connection structure based on tongue-and-groove form |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047334A (en) * | 2021-03-23 | 2021-06-29 | 中铁第四勘察设计院集团有限公司 | Concrete prefabricated part transverse connection node and assembled underground station |
| CN113323212A (en) * | 2021-06-04 | 2021-08-31 | 重庆大学 | Square reinforcing bar rack superimposed sheet of assembled |
-
2020
- 2020-09-08 CN CN202021939751.7U patent/CN212358789U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047334A (en) * | 2021-03-23 | 2021-06-29 | 中铁第四勘察设计院集团有限公司 | Concrete prefabricated part transverse connection node and assembled underground station |
| CN113323212A (en) * | 2021-06-04 | 2021-08-31 | 重庆大学 | Square reinforcing bar rack superimposed sheet of assembled |
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Granted publication date: 20210115 Termination date: 20210908 |