CN212358788U - A kind of prefabricated composite floor concrete composite board hybrid connection structure - Google Patents
A kind of prefabricated composite floor concrete composite board hybrid connection structure Download PDFInfo
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- CN212358788U CN212358788U CN202021938989.8U CN202021938989U CN212358788U CN 212358788 U CN212358788 U CN 212358788U CN 202021938989 U CN202021938989 U CN 202021938989U CN 212358788 U CN212358788 U CN 212358788U
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- 239000002131 composite material Substances 0.000 title claims abstract description 117
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 15
- 238000010276 construction Methods 0.000 description 12
- 230000003014 reinforcing effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Abstract
一种预制复合底板混凝土叠合板混合式连接结构，预制复合底板混凝土叠合板由预制复合底板及顶部后浇混凝土层组成，混合式连接结构包括若干组L型钢连接件，每组L型钢连接件包括两个用于连接相邻预制复合底板的L型钢板，两个L型钢板的竖直板贴合且上部开有螺栓连接孔，通过螺栓连接两竖直板；两个L型钢板的水平板位于同一平面，且下表面通过钢盖板焊接成一体，水平板预埋在预制复合底板板边缘后期形成纵肋、横肋交汇处的位置，竖直板延伸至顶部后浇混凝土层中。本发明在叠合板中的后浇混凝土层采用湿式连接，预制复合底板之间采用干式连接，适用于低、多层中使用的预制复合底板混凝土叠合板中板与板之间的连接。
A prefabricated composite floor concrete composite panel hybrid connection structure, the prefabricated composite floor concrete composite panel is composed of a prefabricated composite floor and a post-cast concrete layer on the top, the hybrid connection structure includes several sets of L-shaped steel connectors, and each set of L-shaped steel connectors includes Two L-shaped steel plates used to connect the adjacent prefabricated composite bottom plates, the vertical plates of the two L-shaped steel plates are attached and the upper part is provided with bolt connection holes, and the two vertical plates are connected by bolts; the horizontal plate of the two L-shaped steel plates It is located on the same plane, and the lower surface is welded into one by the steel cover plate. The horizontal plate is pre-buried in the position where the longitudinal rib and the transverse rib meet at the edge of the prefabricated composite bottom plate, and the vertical plate extends to the top post-cast concrete layer. The invention adopts wet connection for the post-cast concrete layer in the laminated board and dry connection between the prefabricated composite bottom plates, which is suitable for the connection between the plates in the prefabricated composite bottom concrete laminated plate used in low and multi-layer.
Description
Technical Field
The invention belongs to the technical field of building construction, relates to an assembled integral concrete laminated plate structure, and particularly relates to a mixed connecting structure of a prefabricated composite bottom plate concrete laminated plate.
Background
Prefabricated buildings are a great revolution in construction, and prefabricated structural systems, represented by prefabricated concrete structures, are rapidly developed. The concrete composite slab has the advantages of good integrity, high construction speed, template saving, great building prefabrication rate and assembly rate improvement, and the like, and is widely applied to an assembled concrete structure.
The construction method is limited by transportation conditions and hoisting capacity, and the concrete composite slab in the current engineering is formed by splicing a plurality of prefabricated composite bottom plates, laying top reinforcing steel bars on the prefabricated composite bottom plates, pouring a post-cast concrete layer, so that the force transfer performance of the abutted seams between the prefabricated composite bottom plates is the key for ensuring whether the composite slab can bear force in two directions. The connection mode of the laminated slab at the present stage mainly takes two wet connection modes recommended in the technical code of prefabricated concrete structures (JGJ 1-2014), namely: the integral joint wet connection can realize continuous stress of steel bars and concrete in the prefabricated composite bottom plate, the design method is the same as that of a conventional cast-in-place plate under the condition of ensuring the reinforcement of the joint, the integral bidirectional plate can be designed, but the stressed steel bars with certain length extend outwards from the side of the prefabricated composite bottom plate, and cast-in-place belts with certain width are arranged at splicing parts, so that a large amount of formwork supporting and steel bar binding work is required to be carried out on a construction site, the construction speed is reduced, and the advancement of an assembly type technology cannot be reflected; the split joint wet type connection can improve the field installation speed although a post-pouring belt is not needed, but the force transmission performance of the plate in the direction vertical to the joint is weaker, and the bidirectional stress performance of the laminated plate cannot be better realized.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the invention aims to provide a hybrid connecting structure for prefabricated composite floor concrete composite slabs.
In order to achieve the purpose, the invention adopts the technical scheme that:
a prefabricated composite bottom plate concrete composite slab mixed connecting structure comprises a prefabricated composite bottom plate 6 and a top rear pouring concrete layer 7, the mixed connecting structure comprises a plurality of groups of L-shaped steel connecting pieces, each group of L-shaped steel connecting pieces comprises two L-shaped steel plates 1 used for connecting adjacent prefabricated composite bottom plates 6, vertical plates 12 of the two L-shaped steel plates 1 are attached, bolt connecting holes 2 are formed in the upper portions of the vertical plates, and the two vertical plates 12 are connected through bolts 3; two the horizontal plate 11 of L shaped steel board 1 is located the coplanar, and the lower surface welds integratively through steel apron 5, horizontal plate 11 is pre-buried in the position of prefabricated composite bottom plate 6 later stage formation longitudinal rib 82, horizontal rib 81 junction, and vertical board 12 extends to in the top post-cast concrete layer 7.
Preferably, two L-shaped steel plates 1 in each group of L-shaped steel connecting pieces are identical in shape and size, and adjacent prefabricated composite bottom plates 6 are connected through a plurality of groups of L-shaped steel connecting pieces at equal intervals.
Preferably, the prefabricated composite bottom plate 6 comprises a prefabricated concrete bottom plate 61 with a plurality of autoclaved aerated concrete blocks 62 arranged therein, a steel bar truss 63 is arranged on the prefabricated concrete bottom plate 61, and longitudinal ribs 82 or transverse ribs 81 are formed between the autoclaved aerated concrete blocks 62, wherein the longitudinal ribs 82 are concrete in the prefabricated composite bottom plate concrete composite slab along the length direction, the transverse ribs 81 are concrete in the prefabricated composite bottom plate concrete composite slab along the width direction, and the two vertical plates 12 are parallel to the length direction and are perpendicular to the width direction.
Preferably, the top post-cast concrete layer 7 comprises stressed steel bars 71 and post-cast concrete 72, and the bolt connecting holes 2 and the bolts 3 are wrapped in the post-cast concrete 72.
Preferably, horizontal anchor bars 4 are welded on the upper surfaces of the horizontal plates 11 of the two L-shaped steel plates 1 in each group of L-shaped steel connecting pieces, and the anchor bars 4 extend out of the plate surfaces of the horizontal plates 11 and are perpendicular to the vertical plates 12 of the L-shaped steel plates 1.
The invention also provides a construction method of the hybrid connecting structure of the prefabricated composite bottom plate concrete composite slab, which comprises the following steps:
the method comprises the following steps: manufacturing a prefabricated composite bottom plate 6, and embedding an L-shaped steel plate 1 in advance;
step two: in each group of L-shaped steel connecting pieces, the lower surfaces of two horizontal plates 11 are welded into a whole through a steel cover plate 5, and two vertical plates 12 are connected through bolts 3;
step three: and pouring concrete on the prefabricated composite bottom plate 6 to form a top post-cast concrete layer 7, wrapping the bolts 3, and forming the composite prefabricated composite bottom plate concrete laminated slab with bidirectional stress and hybrid connection after the top post-cast concrete layer 7 reaches the design strength.
Preferably, the step one comprises the steps of:
cleaning and clearing the steel structure mould; supporting a side steel formwork according to the design size of the component; brushing a concrete release agent; binding a reinforcing mesh in the prefabricated composite bottom plate 6, putting the bound reinforcing mesh into a supported template, and filling a concrete protective layer cushion block at the bottom of the reinforcing steel bar; then, placing the pre-processed L-shaped steel plate 1 into a specified position, and binding the L-shaped steel plate with a bottom longitudinal tensile steel bar by using an iron wire to prevent the deviation of the embedded part when concrete is poured; 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 62 soaked for 24 hours into a specified position, and pouring 50mm of concrete.
Preferably, when the reinforcing mesh is bound, the steel bar truss and the bottom reinforcing mesh are bound together.
Preferably, in the second step, the pre-processed steel cover plate 5 is placed into the longitudinal ribs 82 on the edge of each prefabricated composite bottom plate 6, and the horizontal plane 11 is flush with the prefabricated composite bottom plate 6 at the position where the longitudinal ribs and the transverse ribs can meet at the later stage, that is, the horizontal plane 11 is exposed at the bottom of the prefabricated composite bottom plate 6; after the strength of the prefabricated composite bottom plates 6 reaches 70% of the designed strength of concrete, hoisting the prefabricated composite bottom plates 6 to a specified design position, and welding and connecting the horizontal plates 11 exposed at the bottom between the adjacent prefabricated composite bottom plates 6 by adopting rectangular steel cover plates 5 to connect the prefabricated composite bottom plates 6 into a whole; and then the bolt 3 is inserted into the bolt connecting hole 2 for connection.
Preferably, in the third step, the stressed steel bars 71 in two directions at the top of the prefabricated composite bottom plate 6 are laid firstly, and after the situation that no error exists is confirmed, concrete is poured on the prefabricated composite bottom plate 6 to form a top post-poured concrete layer 7.
The invention has simple structure, safe structure, advanced technology, simple and convenient construction and quick construction, and has the following advantages:
1. compared with the traditional integral joint wet connection of the laminated slab, the invention has the advantages that: the construction site that can remove to set up the cast-in-place area of certain width and lead to at the concatenation position need develop a large amount of templates and prop up and the work of reinforcement, improves the industrialization construction efficiency of assembly type structure by a wide margin.
2. Because of the special structural form and the stress characteristic of the prefabricated composite bottom plate concrete composite slab, the dry connection of the prefabricated composite bottom plate and the wet connection of the rear pouring layer ensure the continuity of the stress of the concrete rib in the prefabricated composite bottom plate concrete composite slab, so compared with the traditional separated seam wet connection of the composite slab, the invention ensures the bidirectional stress performance of the formed slab.
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 the vertical structure of the L-shaped steel connecting piece of the invention.
FIG. 3 is a schematic three-dimensional structure of the L-shaped steel connecting piece of the invention.
FIG. 4 is a schematic view (plan view) of the position of the L-shaped steel connecting member embedded in the prefabricated composite floor of the present invention
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 composite connecting structure of a prefabricated composite bottom plate concrete laminated slab, which is characterized in that referring to fig. 1, the prefabricated composite bottom plate concrete laminated slab is composed of a prefabricated composite bottom plate 6 and a top post-cast concrete layer 7, the prefabricated composite bottom plate 6 comprises a prefabricated concrete bottom plate 61 with a plurality of autoclaved aerated concrete blocks 62 arranged inside, and a steel bar truss 63 is arranged on the prefabricated concrete bottom plate 61. Longitudinal ribs 82 or transverse ribs 81 are formed between the autoclaved aerated concrete blocks 62, wherein the longitudinal ribs 82 are concrete in the length direction of the prefabricated composite floor concrete composite slab, the transverse ribs 81 are concrete in the width direction of the prefabricated composite floor concrete composite slab, and L, B, H in the figure indicates the length, width and height of a single prefabricated composite floor 6. The top post-cast concrete layer 7 comprises stressed steel bars 71 and post-cast concrete 72, and the stressed steel bars 71 are laid above the prefabricated composite bottom plate 6.
The hybrid connecting structure comprises a dry connecting structure and a wet connecting structure. Wherein:
referring to fig. 2 and 3, the dry type connecting structure includes a plurality of groups of L-shaped steel connecting members, each group of L-shaped steel connecting members includes two L-shaped steel plates 1 for connecting adjacent prefabricated composite bottom plates 6, the two L-shaped steel plates 1 in each group of L-shaped steel connecting members are identical in shape and size, and the adjacent prefabricated composite bottom plates 6 can be connected by a plurality of groups of L-shaped steel connecting members at equal intervals. Two the laminating of the vertical board 12 of L shaped steel board 1 and upper portion are opened there is bolted connection hole 2, two the horizontal plate 11 of L shaped steel board 1 is located the coplanar, connects two vertical boards 12 through bolt 3 to weld two horizontal plate 11's lower surface through steel apron 5 and become an organic whole, realize adjacent prefabricated composite bottom plate 6's connection, strengthen its shear resistance with this, the surface of welding is shown in the figure to be 9. The prefabricated composite bottom plate concrete composite slab mainly takes a top post-cast concrete layer 7, a prefabricated concrete bottom plate 61 and a concrete rib formed among the autoclaved aerated concrete blocks 62 as a bearing system under the action of vertical load. Therefore, for the convenience of dry connection, the horizontal plate 11 is pre-embedded at the position where the longitudinal rib 82 and the transverse rib 81 are formed at the later stage of the edge of the prefabricated composite bottom plate 6, as shown in fig. 4 and 5, the two vertical plates 12 are parallel to the length direction and perpendicular to the width direction, and the bolt connecting holes 2 on the vertical plates 12 are required to be located above the prefabricated composite bottom plate 6. The width of the laminate in fig. 4 can be expressed as B × n, where n is the number of prefabricated composite bottom panels 6.
In the invention, horizontal anchor bars 4 can be welded on the upper surfaces of the horizontal plates 11 of the two L-shaped steel plates 1 in each group of L-shaped steel connecting pieces, the anchor bars 4 extend out of the plate surfaces of the horizontal plates 11 and are vertical to the vertical plates 12 of the L-shaped steel plates 1, and the second welding surface 8 is shown in the figure.
The wet connection structure is that the top post-cast concrete layer 7 is formed by laying stressed steel bars 71 and pouring post-cast concrete 72, and the parts, which are exposed above the prefabricated composite bottom plate 6 and connected by bolts, of the dry connection structure are also poured together, so that the parts are wrapped in the post-cast concrete 72, and the whole plate forms a plate type member stressed in two directions, as shown in fig. 4 and 5.
The invention also provides a construction method of the hybrid connecting structure of the prefabricated composite bottom plate concrete composite slab, which comprises the following steps:
the method comprises the following steps: and manufacturing a prefabricated composite bottom plate 6, and embedding the L-shaped steel plate 1 in advance.
Specifically, the method comprises the following steps: cleaning and clearing the steel structure mould; supporting a side steel formwork according to the design size of the component; brushing a concrete release agent; binding a reinforcing mesh (a reinforcing truss and a bottom reinforcing mesh are bound together) in the prefabricated composite bottom plate 6, putting the bound reinforcing mesh into a supported template, and filling a concrete protective layer cushion block at the bottom of the reinforcing steel; then, placing the pre-processed L-shaped steel plate 1 into a specified position, and binding the L-shaped steel plate with a bottom longitudinal tensile steel bar by using an iron wire to prevent the deviation of the embedded part when concrete is poured; after all the works are confirmed to be correct, pouring concrete with the thickness of 50 mm; then placing the autoclaved aerated concrete block 62 soaked for 24 hours at a designated position to ensure the adhesion between the autoclaved aerated concrete block and the concrete, pouring 50mm of concrete, and tapping the aerated block by using a rubber hammer to keep the top surface height of the aerated block 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 concave and convex surfaces is more than or equal to 4mm specified in 9.5.2 bars of the design Specification of concrete structures.
Step two: dry-type connection: in each group of L-shaped steel connecting pieces, the lower surfaces of two horizontal plates 11 are welded into a whole through a steel cover plate 5, and two vertical plates 12 are connected through bolts 3.
Specifically, the method comprises the following steps: hoisting the prefabricated composite bottom plate to a specified design position of a building, and cleaning the exposed part of the L-shaped steel plate 1 in the prefabricated composite bottom plate (preventing the left concrete blocks from influencing the welding when the concrete is poured in the step one); placing the pre-processed steel cover plate 5 into the longitudinal ribs 82 at the plate edge of each prefabricated composite bottom plate 6, wherein the horizontal plane 11 is flush with the prefabricated composite bottom plate 6 at the position of the intersection of the longitudinal ribs and the transverse ribs which can be formed at the later stage, namely the horizontal plane 11 is exposed at the plate bottom of the prefabricated composite bottom plate 6; after the strength of the prefabricated composite bottom plates 6 reaches 70% of the designed strength of concrete, hoisting the prefabricated composite bottom plates 6 to a specified design position, and welding and connecting the horizontal plates 11 exposed at the bottom between the adjacent prefabricated composite bottom plates 6 by adopting rectangular steel cover plates 5 to connect the prefabricated composite bottom plates 6 into a whole; and then the bolt 3 is inserted into the bolt connecting hole 2 for bolt connection.
Step three: wet connection: and pouring concrete on the prefabricated composite bottom plate 6 to form a top post-cast concrete layer 7, wrapping the bolts 3, and forming the composite prefabricated composite bottom plate concrete laminated slab with bidirectional stress and hybrid connection after the top post-cast concrete layer 7 reaches the design strength.
Specifically, the method comprises the following steps: firstly, the stressed reinforcing steel bars 71 in two directions at the top of the prefabricated composite bottom plate 6 are laid, and after the situation that no error exists is confirmed, concrete is poured on the prefabricated composite bottom plate 6 to form a top post-pouring concrete layer 7.
Claims (5)
1. A composite connecting structure of a prefabricated composite bottom plate concrete laminated slab is composed of a prefabricated composite bottom plate (6) and a top rear pouring concrete layer (7), and is characterized in that the composite connecting structure comprises a plurality of groups of L-shaped steel connecting pieces, each group of L-shaped steel connecting piece comprises two L-shaped steel plates (1) used for connecting adjacent prefabricated composite bottom plates (6), vertical plates (12) of the two L-shaped steel plates (1) are attached, bolt connecting holes (2) are formed in the upper portions of the vertical plates, and the two vertical plates (12) are connected through bolts (3); two horizontal plate (11) of L shaped steel board (1) are located the coplanar, and the lower surface welds integratively through steel apron (5), horizontal plate (11) are pre-buried in prefabricated composite bottom plate (6) later stage formation vertical rib (82), horizontal rib (81) position of junction, and vertical board (12) extend to in top post-cast concrete layer (7).
2. The hybrid connecting structure of prefabricated composite floor concrete composite slab as claimed in claim 1, wherein two L-shaped steel plates (1) in each set of L-shaped steel connecting pieces are identical in shape and size, and adjacent prefabricated composite floors (6) are connected by a plurality of sets of L-shaped steel connecting pieces which are equally spaced.
3. The hybrid connecting structure of the prefabricated composite floor concrete composite slab as claimed in claim 1, wherein the prefabricated composite floor (6) comprises a prefabricated concrete floor (61) with a plurality of autoclaved aerated concrete blocks (62) arranged therein, a steel bar truss (63) is arranged on the prefabricated concrete floor (61), and longitudinal ribs (82) or transverse ribs (81) are formed between the autoclaved aerated concrete blocks (62), wherein the longitudinal ribs (82) are concrete in the prefabricated composite floor concrete composite slab along the length direction, the transverse ribs (81) are concrete in the prefabricated composite floor concrete composite slab along the width direction, and the two vertical plates (12) are parallel to the length direction and perpendicular to the width direction.
4. The hybrid connecting structure of precast composite floor concrete composite slab as claimed in claim 1, wherein the top post-cast concrete layer (7) comprises a stress reinforcement (71) and a post-cast concrete (72), and the bolt connecting hole (2) and the bolt (3) are wrapped in the post-cast concrete (72).
5. The hybrid connecting structure of the prefabricated composite floor concrete composite slab as claimed in claim 1, wherein horizontal anchor bars (4) are welded on the upper surfaces of the horizontal plates (11) of the two L-shaped steel plates (1) in each set of L-shaped steel connecting members, and the anchor bars (4) extend out of the plate surfaces of the horizontal plates (11) and are perpendicular to the vertical plates (12) of the L-shaped steel plates (1).
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| CN202021938989.8U CN212358788U (en) | 2020-09-08 | 2020-09-08 | A kind of prefabricated composite floor concrete composite board hybrid connection structure |
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| CN202021938989.8U CN212358788U (en) | 2020-09-08 | 2020-09-08 | A kind of prefabricated composite floor concrete composite board hybrid connection structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980263A (en) * | 2020-09-08 | 2020-11-24 | 兰州理工大学 | A kind of prefabricated composite floor concrete composite board hybrid connection structure and construction method |
| CN118461819A (en) * | 2024-07-12 | 2024-08-09 | 福建建工装配式建筑研究院有限公司 | Assembled concrete slab column structure and construction method thereof |
-
2020
- 2020-09-08 CN CN202021938989.8U patent/CN212358788U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980263A (en) * | 2020-09-08 | 2020-11-24 | 兰州理工大学 | A kind of prefabricated composite floor concrete composite board hybrid connection structure and construction method |
| CN111980263B (en) * | 2020-09-08 | 2024-09-13 | 兰州理工大学 | Mixed connection structure of precast composite floor concrete superimposed sheet and construction method |
| CN118461819A (en) * | 2024-07-12 | 2024-08-09 | 福建建工装配式建筑研究院有限公司 | Assembled concrete slab column structure and construction method thereof |
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