CN111719753A - Laminated slab with dragon boat hanging ribs for enhancing bearing capacity at abutted seam and preparation method thereof - Google Patents
Laminated slab with dragon boat hanging ribs for enhancing bearing capacity at abutted seam and preparation method thereof Download PDFInfo
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- CN111719753A CN111719753A CN202010549242.1A CN202010549242A CN111719753A CN 111719753 A CN111719753 A CN 111719753A CN 202010549242 A CN202010549242 A CN 202010549242A CN 111719753 A CN111719753 A CN 111719753A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
- E04B5/18—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly cast between filling members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
- E04B2005/176—Floor structures partly formed in situ with peripheral anchors or supports
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Abstract
The invention discloses a laminated slab provided with a dragon boat hoisting rib for enhancing the bearing capacity of a splicing seam and a preparation method thereof, wherein the laminated slab comprises a dragon boat hoisting rib net, reinforced concrete prefabricated slabs with four sides not protruding, additional reinforcing steel bars, a laminated slab rib net and a cast-in-place layer; the end parts of the reinforced concrete prefabricated plates without the four edges at the two ends of the dragon boat lifting rib are bent upwards to extend out of the reinforced concrete prefabricated plates without the four edges to form an upward bent lifting end, the end part of the upward bent lifting end is processed into a bent hook-shaped structure, the upward bent lifting end extends out of the reinforced concrete prefabricated plates without the four edges to a laminated plate surface rib net in a cast-in-place layer, and the bent hook-shaped structure at the end part of the upward bent lifting end is hooked and hung on longitudinal steel bars of the laminated plate surface rib net; the invention effectively improves the transmission capacity of shearing force and bending moment at the joint between the precast slab and the peripheral member, improves the shearing strength of the interface between the precast slab and the cast-in-place layer, and effectively avoids the possibility of cracking new and old concrete at the joint when the precast slab is subjected to a large load, thereby enhancing the reliability of the whole structure.
Description
Technical Field
The invention belongs to the technical field of building structures, and particularly relates to a laminated slab structure for enhancing bearing capacity of a splicing seam by using dragon boat hanging ribs and a construction method thereof.
Background
The reinforced concrete composite slab can combine the advantages of the cast-in-place slab and the fully prefabricated slab, and has the advantages of high construction speed, short construction period, light weight of prefabricated components, good integrity, template saving and the like. However, there are still some problems in practical engineering application: the shearing strength of the joint interface of the laminated slab prefabricated body and the cast-in-place body is insufficient, so that the relative displacement between new and old concrete is easily caused to cause cracking; the bending moment and the shearing force between the laminated slab and the peripheral component are low in transmission efficiency, and particularly, large deformation and cracks are easily generated at the joint between the laminated slab and the beam support and the joint between two prefabricated slabs, and the problems are important obstacles for the popularization of the fabricated building.
The existing superimposed slab without ribs on four sides adopts additional reinforcing steel bars to transfer force at the abutted seam of the superimposed slab and a peripheral component, the bending moment of the section at the abutted seam is borne by a concrete cast-in-place layer and the additional reinforcing steel bars, but because the additional reinforcing steel bars and stressed longitudinal bars in the prefabricated slab are not directly and effectively overlapped, the height of the sections of the two reinforcing steel bars is inconsistent, the section is suddenly changed, the bearing capacity and the rigidity of a node are obviously reduced, and the weak point is easily formed at the abutted seam of the node under the action of common load or earthquake.
Disclosure of Invention
Based on the defects of the connection form of the primary and secondary beam nodes of the existing fabricated concrete building, the invention provides a laminated slab with a dragon boat hanging bar for strengthening the bearing capacity of the splicing seam and a preparation method thereof
The above object of the present invention is achieved by the following technical solutions:
the laminated slab is provided with a dragon boat hanging rib for strengthening the bearing capacity of the spliced seam, and comprises a reinforced concrete prefabricated slab with four sides not exposed, an additional reinforcing bar, a laminated slab rib net and a cast-in-place layer; a plurality of additional steel bars are longitudinally arranged on the surface of the upper end of the reinforced concrete prefabricated plate with no concrete on the four sides at intervals, one end of each additional steel bar is connected to the reinforced concrete prefabricated plate with no concrete on the four sides, and the other end of each additional steel bar is connected to the peripheral component; the anchoring lengths of the additional steel bars in the reinforced concrete precast slabs and the peripheral members and the distance between two adjacent additional steel bars on four sides meet the regulations of the technical specification of the prefabricated concrete structure and the technical specification of the prefabricated concrete structure building; the cast-in-place layer is formed by pouring concrete on the reinforced concrete precast slabs with no concrete on four sides and the peripheral members; the cast-in-place layer forms a concrete laminated slab tightly combined with the reinforced concrete prefabricated slabs with no concrete on four sides; the peripheral component is another precast concrete slab, concrete beam or concrete wall with four sides not exposed;
the laminated slab further comprises a dragon boat lifting rib net, and the dragon boat lifting rib net is poured in the reinforced concrete precast slabs with no concrete on the four sides; the dragon boat hoisting rib net is mainly formed by binding a plurality of dragon boat hoisting ribs arranged at intervals longitudinally and a plurality of concrete precast slab distribution reinforcing steel bars arranged at intervals transversely to form a grid shape; the end parts of the reinforced concrete prefabricated plates without the four edges at the two ends of the dragon boat lifting rib are bent upwards to extend out of the reinforced concrete prefabricated plates without the four edges to form an upward bent lifting end, the end part of the upward bent lifting end is processed into a bent hook-shaped structure, the upward bent lifting end extends out of the reinforced concrete prefabricated plates without the four edges to a laminated plate surface rib net in a cast-in-place layer, and the bent hook-shaped structure at the end part of the upward bent lifting end is hooked and hung on longitudinal steel bars of the laminated plate surface rib net; the distribution spacing of the dragon boat hanging bars and the distribution spacing of the longitudinal reinforcing steel bars of the laminated plate surface rib net meet the spacing of stressed reinforcing steel bars in the plate in GB 50010-Buck 2010 standard of concrete structure design.
In order to further achieve the object of the present invention, preferably, the dragon boat reinforcing net further comprises a pressing rib; at least one pressing rib is transversely arranged at the end part, bent upwards, of the edge of the reinforced concrete precast slab, at the two ends of the plurality of spaced keel hanging ribs, the four edges of the end part are not exposed, the pressing rib is bound with the keel hanging ribs, and the pressing rib forms a reinforcing steel bar transversely arranged in a keel hanging rib net.
Preferably, the press bars are 2-3 steel bars arranged at intervals of 30-50 mm, and each press bar is bound with the dragon boat lifting bar.
Preferably, the distance between the bent part of the upward bent hoisting end of the dragon boat hoisting bar and the edges of the reinforced concrete precast slabs with four sides not exceeding the edge is not less than 15 mm.
Preferably, the length of the hook-shaped structure at the upward-bending hanging end is 5-7 times of the diameter of the dragon boat hanging rib.
Preferably, two ends of the dragon boat lifting bar are bent upwards by 90 degrees at the ends of the reinforced concrete precast slabs on four sides.
Preferably, the dragon boat lifting rib 4 of the dragon boat lifting rib net and the longitudinal steel bar of the laminated plate surface rib net in the laminated plate surface rib net are on the same vertical plane.
Preferably, when the dragon boat hanging rib of the dragon boat hanging rib net and the longitudinal steel bar of the laminated plate rib net in the laminated plate rib net are not on the same vertical plane, the bent hanging end of the dragon boat hanging rib is obliquely hooked and hung on the longitudinal steel bar of the laminated plate rib net close to the laminated plate rib net, or the laminated plate rib net is additionally provided with the longitudinal steel bar of the laminated plate rib net which is in a straight line with the bent hanging ends at the two ends of the dragon boat hanging rib, so that the bent hanging end of the dragon boat hanging rib can be hooked and hung on the longitudinal steel bar of the laminated plate rib net.
Preferably, the concrete beam is a cast-in-place beam cathode superposed beam; the superposed beam is a superposed beam edge beam prefabricated body or a superposed beam middle beam prefabricated body; the superposed beam edge beam prefabricated body or the superposed beam middle beam prefabricated body is a cuboid reinforced concrete member with a cuboid notch communicated with the upper part.
The preparation method of the laminated slab with the dragon boat hanging ribs for enhancing the bearing capacity of the abutted seams comprises the following steps:
a. bending the steel bar upwards, and processing the end part of the steel bar into a hook shape to manufacture the dragon boat lifting bar with the upward bending lifting end;
b. binding a dragon boat lifting rib net in a prefabricated plate template of a prefabrication plant, ensuring that an upper bent lifting end extends out of the prefabricated plate to reach the height of the laminated plate surface rib net, pouring after binding the dragon boat lifting rib net, and maintaining to reach the design strength;
c. transporting and hoisting the concrete precast slab with the dragon boat hoisting rib net to a designed position;
d. additional steel bars are arranged on the concrete precast slab with the dragon ship hanging bar net at intervals, and the superposed slab face bar net is bound;
e. hooking and hanging end part hook-shaped structures of upper bent hanging ends at two ends of a dragon boat hanging rib of the dragon boat hanging rib net on longitudinal steel bars of the laminated plate surface rib net;
f. pouring cast-in-place layer concrete on the laminated plate surface rib net and the peripheral component and vibrating to ensure that the laminated plate is tightly connected with the peripheral component, so that the laminated plate which has strong bearing capacity and is provided with a dragon boat hanging rib for strengthening the bearing capacity of the spliced seam is formed.
The conception of the invention is as follows: by changing the stressed longitudinal bars of the steel bar mesh of the traditional concrete precast slab, at the joints of the reinforced concrete precast slab 1 and peripheral members, which are not arranged on the four sides, the dragon boat hoisting bar mesh in the precast slab 1 and the laminated slab surface bar mesh 7 in the cast-in-place layer 3 are connected into a whole, so that the bending moment and the shear force transmission performance of the laminated slab at the joint seam are enhanced, and the connection between new and old concrete is hopefully enhanced by connecting the precast slab steel bar mesh and the laminated slab surface bar mesh 7, and the precast slab and the cast-in-place layer are prevented from relatively moving under the shear force action when the load is applied, so that the joint surface of the new and old concrete is prevented from cracking. The dragon boat lifting rib 4 well connects a dragon boat lifting rib net in the reinforced concrete prefabricated slab 1 with no concrete on four sides and a laminated slab surface rib net 7 in the cast-in-place layer 3 into a whole through the upward bent lifting end 4a, and the purpose is achieved.
Compared with the prior art, the invention has the advantages that:
1. the upward bending hanging end of the dragon boat hanging rib net extends into the cast-in-place layer, so that the connection between new and old concrete is enhanced, and the relative displacement between the precast slab and the cast-in-place layer under the shearing force is limited.
2. The dragon boat hangs the muscle and hangs the superimposed sheet gluten through the end hook that hangs that bends upward, and the tensile strength of make full use of superimposed sheet gluten makes the reinforcing bar net in the superimposed sheet form wholly, has improved the structure at superimposed sheet and peripheral component at the transmission ability of piece department moment of flexure, shear force to greatly improve the rigidity and the bearing capacity of structure.
3. The dragon boat lifting rib with the upper bent lifting end can be formed only by simply bending the reinforcing steel bars and processing the lifting hooks, the structure is simple, and the manufacturing process can be efficiently completed through an automatic production line.
4. The concrete precast slab adopting the dragon boat hanging bars can realize that no steel bars extend out of the periphery of the precast slab, a new template does not need to be manufactured according to different reinforcement conditions of the precast slab, the consumption of a steel template is reduced, the manufacturing cost of the precast slab is reduced, the precast slab has high economy, the production efficiency of a member precast plant is improved to a certain extent, and the economic and efficient characteristics of an assembly type building are met.
Drawings
FIG. 1 is a composite slab provided with a dragon boat hanging rib for reinforcing bearing capacity at a spliced seam;
FIG. 2 is an isometric view of the keel net of FIG. 1;
FIG. 3 is a front view of the keel net of FIG. 1;
FIG. 4 is a top view of the keel net of FIG. 1;
FIG. 5 is a side view of the keel net of FIG. 1;
FIG. 6 is a schematic view of the keel of FIG. 1;
FIG. 7 is an isometric view of a node of a precast concrete slab and a precast composite beam part according to the present invention;
FIG. 8 is a front view of a concrete composite slab and composite beam joint according to the present invention;
FIG. 9 is a side view of a concrete composite slab and composite beam joint of the present invention;
FIG. 10 is a front view of a side beam joint of a concrete composite slab and a composite beam according to the present invention;
FIG. 11 is a front view of a concrete composite slab and a center beam joint of a composite beam according to the present invention;
FIG. 12 is an isometric view of a concrete precast slab according to the present invention and a concrete precast slab joint;
FIG. 13 is a side view of a concrete slab according to the present invention and a node of the concrete slab;
FIG. 14 is a front view of a concrete slab and a concrete slab joint according to the present invention;
the figures show that: the prefabricated concrete slab comprises a prefabricated concrete slab 1, a prefabricated overlapped side beam 2a, a prefabricated overlapped middle beam 2b, a cast-in-place layer 3, a dragon boat lifting rib 4, an upper bent lifting end 4a, a pressing rib 5, an additional reinforcing steel bar 6, a laminated plate surface rib net 7, a longitudinal reinforcing steel bar 7a of the laminated plate surface rib net and a prefabricated concrete slab distribution reinforcing steel bar 8.
Detailed Description
To better support the present invention, the present invention will be further described below with reference to the accompanying drawings, but embodiments of the present invention are not limited thereto.
As shown in fig. 1-6, a laminated slab with a dragon boat hanging bar for reinforcing bearing capacity at a splicing seam comprises a reinforced concrete precast slab 1 with no concrete on four sides, a dragon boat hanging bar net, an additional steel bar 6, a laminated slab face bar net 7 and a cast-in-place layer 3; pouring the keel nets of the dragon boat into the reinforced concrete precast slabs with no concrete on the four sides; the dragon boat hoisting rib net is mainly formed in a grid shape by binding a plurality of dragon boat hoisting ribs 4 which are longitudinally arranged at intervals and a plurality of concrete precast slab distribution reinforcing steel bars 8 which are transversely arranged at intervals; the two ends of the dragon boat lifting rib 4 are bent upwards at the end parts of the reinforced concrete prefabricated plates 1 with no edges out to extend out of the reinforced concrete prefabricated plates 1 with no edges out to form an upper bent lifting end 4a, the end parts of the upper bent lifting ends 4a are processed into hook-shaped structures, the upper bent lifting ends 4a extend out of the reinforced concrete prefabricated plates 1 with no edges out to the laminated plate surface rib net 7 in the cast-in-place layer 3, and the hook-shaped structures at the end parts of the upper bent lifting ends 4a are hooked and hung on the longitudinal steel bars 7a of the laminated plate surface rib net 7; a plurality of additional steel bars 6 are longitudinally arranged on the surface of the upper end of the reinforced concrete prefabricated slab 1 with no concrete on the four sides at intervals, one end of each additional steel bar 6 is connected to the reinforced concrete prefabricated slab 1 with no concrete on the four sides, and the other end of each additional steel bar 6 is connected to a peripheral component; the anchoring length of the additional steel bars 6 in the reinforced concrete precast slabs 1 and the peripheral members and the distance between two adjacent additional steel bars 6 can meet the regulations of the technical code of the prefabricated concrete structure and the technical code of the prefabricated concrete structure building; the cast-in-place layer 3 is formed by pouring concrete on the reinforced concrete precast slabs 1 with no concrete on four sides and peripheral components; the cast-in-place layer 3 forms a concrete laminated slab tightly combined with the reinforced concrete prefabricated slab 1 with no concrete on four sides; the peripheral component is another precast concrete slab 1, a concrete beam or a concrete wall, the four sides of which are not exposed; the distribution distance of the dragon boat hanging bars 4 and the distribution distance of the longitudinal reinforcements 7a of the laminated plate surface rib net meet the distance of stressed reinforcements in a plate in GB 50010-2010 standard on concrete structure design.
Preferably, the dragon boat reinforcing mesh also comprises a pressing rib 5; at least one pressing rib 5 is transversely arranged at the end part of the plurality of spaced keel hanging ribs 4, the four sides of which are not bent upwards from the edge of the reinforced concrete precast slab 1, and the pressing rib 5 is bound with the keel hanging ribs 4, so that the pulling resistance of the keel hanging ribs 4 is improved when a load is applied. Further preferably, 2-3 press bars 5 are arranged at intervals of 30-50 mm, and each press bar 5 is bound with the dragon boat lifting bar 4.
Preferably, the distance between the bent-up hanging end 4a of the dragon boat hanging bar 4 and the edges of the reinforced concrete precast slabs 1 with four sides not exceeding the width is not less than 15 mm.
Preferably, the length of the hook-shaped structure of the upper bent lifting end 4a is 5-7 times of the diameter of the dragon boat lifting rib, and the connection strength between the dragon boat lifting rib and the gluten is guaranteed.
Preferably, both ends of the dragon boat suspending bar 4 are bent upward by 90 ° at the ends of the reinforced concrete precast slabs 1 whose four sides do not protrude.
Preferably, the dragon boat lifting rib 4 in the dragon boat lifting rib net and the longitudinal steel bar 7a of the laminated plate face rib net in the laminated plate face rib net 7 are arranged up and down correspondingly, namely the dragon boat lifting rib 4 of the dragon boat lifting rib net and the longitudinal steel bar 7a of the laminated plate face rib net in the laminated plate face rib net 7 are on the same vertical plane; the bent hanging end 4a of the dragon boat hanging rib 4 can be hung on the longitudinal steel bar 7a of the laminated plate surface rib net 7 by a hook.
When the dragon boat hanging rib 4 of the dragon boat hanging rib net and the longitudinal steel bar 7a of the laminated plate face rib net in the laminated plate face rib net 7 are not on the same vertical plane, the bent hanging end 4a of the dragon boat hanging rib 4 is obliquely hooked on the longitudinal steel bar 7a of the laminated plate face rib net close to the laminated plate face rib net 7, or the laminated plate face rib net longitudinal steel bar 7a on the same straight line with the bent hanging ends 4a at the two ends of the dragon boat hanging rib 4 is additionally arranged on the laminated plate face rib net 7, so that the bent hanging end 4a of the dragon boat hanging rib 4 can be hooked on the laminated plate face rib net longitudinal steel bar 7a of the laminated plate face rib net 7, and the steel bar nets in the laminated plate form a whole body with common stress.
Preferably, the concrete beam is a cast-in-place beam cathode superposed beam; the superposed beam is a superposed beam edge beam prefabricated body 2a or a superposed beam middle beam prefabricated body 2 b; the superposed beam edge beam prefabricated body 2a or the superposed beam middle beam prefabricated body 2b is a cuboid reinforced concrete member with the upper part provided with a through cuboid notch.
As shown in fig. 7-11, the device for connecting the laminated slab and the laminated beam with the bearing capacity of the reinforced splicing seam of the dragon boat hanging rib comprises a prefabricated slab 1 with no concrete on four sides, prefabricated bodies 2a of the side beams and the middle beams of the laminated beam, a net of the dragon boat hanging rib, additional steel bars 6, a net of the laminated slab ribs 7 and an upper cast-in-place concrete layer 3. The superposed beam edge beam prefabricated body 2a and the superposed beam middle beam prefabricated body 2b are cuboid reinforced concrete members with upper parts provided with through cuboid notches. When the laminated slab is connected with the laminated beam, the reinforced concrete precast slabs 1 with the dragon boat hoisting rib net on the four sides are respectively placed on the edges of the upper surfaces of the side beam precast bodies 2a and the middle beam precast body 2b of the laminated beam, after the laminated plate reinforcing mesh 7 is bound, the upward bent hanging end 4a exposed out of the surface of the prefabricated plate 1 is hooked and hung on the longitudinal stressed reinforcing steel bar 7a of the laminated plate reinforcing mesh according to the design condition, and placing the additional steel bars 6 on the upper surface of the precast slab 1 according to the designed spacing and anchoring length of the technical specification of the prefabricated concrete structure (JGJ 1-2014) and the technical specification of the prefabricated concrete structure building (GBT51231-2016), and finally pouring the concrete cast-in-place layer 3, wherein the concrete cast-in-place layer 3 is combined with the precast slab 1, the precast body 2a of the edge beam of the composite beam and the precast body 2b of the middle beam of the composite beam to form the composite slab and the composite beam. The traditional superimposed slab without ribs on four sides transmits force to the superimposed beams on two sides mainly through cast-in-place layer concrete, and the additional reinforcing steel bars are not directly overlapped with a reinforcing steel bar net in the prefabricated slab, so that the force transmission capability is weaker, and the cracks are easily caused at the spliced seams between the superimposed slab and the superimposed beams. The upward-bent hanging end 4a of the dragon boat hanging rib 4 can realize that the shearing force and the bending moment are directly transmitted between the dragon boat hanging rib net in the precast slab 1 and the gluten net 7 in the cast-in-place layer, the tensile strength of the longitudinal stress steel bar 7a of the laminated slab surface rib net is fully utilized, the concrete stress of the cast-in-place layer 3 is reduced, and the possibility of cracking of the laminated slab and the laminated beam at the spliced seam is reduced.
Fig. 12-14 show that the connecting device for the laminated slab with the bearing capacity at the reinforced splicing seams of the dragon boat lifting ribs and the other laminated slab with the bearing capacity at the reinforced splicing seams of the dragon boat lifting ribs comprises a reinforced concrete precast slab 1 with four sides, a dragon boat lifting rib net, additional reinforcing steel bars 6, a laminated slab rib net 7 and an upper concrete cast-in-place layer 3; the height of the upper bent hanging end 4a is set to reach the height of the laminated plate surface rib net 7 so as to hook the longitudinal steel bar 7a of the laminated plate surface rib net; the length of the upper bent hanging end 4a extending out of the precast slab 1 is equal to the thickness of the cast-in-place layer 3 minus the thickness of the concrete protective layer. When the laminated slab is connected with the laminated slab, the prefabricated slab 1 with the non-rib-out ribs on the four sides of the keel hanging rib net is hoisted to a designed position, after the laminated slab rib net 7 is bound, the upward-bent hoisting end 4a of the keel hanging rib is hooked and hoisted on the longitudinal steel bar 7a in the laminated slab rib net 7, and the situation that the bending moment and the shearing force are transmitted between the keel hanging rib 4 and the longitudinal steel bar 7a of the laminated slab rib net through the connection of the upward-bent hoisting end 4a is ensured. The horizontal distribution of the dragon boat hanging bar 4 in the concrete precast slab and the longitudinal steel bar 7a of the laminated slab surface bar net in the cast-in-place layer 3 should be kept uniform, so that the upward bent hanging end 4a of the dragon boat hanging bar can be hooked on the longitudinal steel bar 7a of the laminated slab surface bar net, and the steel bar nets in the laminated slab form a whole with common stress. The additional reinforcing steel bars 6 are placed on the upper surface of the prefabricated slab 1 according to the design requirements, and the spacing and anchoring length of the additional reinforcing steel bars 6 meet the relevant regulations of the technical Specification for prefabricated concrete structures (JGJ 1-2014) and the technical Specification for construction of prefabricated concrete structures (GBT 51231-2016). And finally, pouring a concrete cast-in-place layer 3, wherein the concrete cast-in-place layer 3 is tightly combined with the precast slab 1 to form the laminated slab. The traditional close splicing seams between the prefabricated plates 1 with ribs on four sides cannot transmit bending moment, the bending moment in the laminated plate is mainly transmitted by the cast-in-place layer 3 and the gluten net 7 in the cast-in-place layer, and the bending moment in the prefabricated plates 1 cannot be effectively transmitted due to the lack of connection of reinforcing steel bars between the prefabricated plates 1 and the cast-in-place layer 3, so that the splicing seams between the prefabricated plates and the junctions of new and old concrete layers around the splicing seams are easily generated. And the bent-up hanging end 4a of the dragon boat hanging rib connects the dragon boat hanging rib net in the precast slab with the face rib net 7 in the laminated slab, so that the bending moment in the precast slab 1 can be effectively transmitted through the face rib net 7 in the cast-in-place layer 3, the possibility of the crack of the abutted seam between the two precast slabs is reduced, meanwhile, the bent-up hanging end 4a penetrates through the new concrete layer and the old concrete layer to closely connect the new concrete layer and the old concrete layer, and the possibility of the crack of the junction of the new concrete layer and the old concrete layer at the periphery of the abutted seam is also reduced.
The invention is realized by the following construction method: in a member prefabrication factory, bending the steel bars by 90 degrees according to design requirements, processing the end parts of the steel bars into a hook shape, and manufacturing a dragon boat lifting bar 4 with an upper bent lifting end; binding a gantry hoisting rib net in a formwork of the reinforced concrete prefabricated slab 1 with no concrete on four sides of a component prefabrication factory to ensure that an upward-bent hoisting end 4a is vertical to the upper surface of the reinforced concrete prefabricated slab 1 with no concrete on four sides; the height of the upper bent hanging end 4a is up to the height of the laminated plate reinforcing mesh 7 so as to hook the longitudinal reinforcing steel bars 7a of the laminated plate reinforcing mesh; the length of the upper bent hanging end 4a extending out of the precast slab 11 is equal to the thickness of the cast-in-place layer 3 minus the thickness of the concrete protective layer. After the binding is finished, pouring the reinforced concrete precast slabs 1 with no concrete on the four sides, and performing brushing treatment on the upper surfaces of the reinforced concrete precast slabs 1 with no concrete on the four sides; after the reinforced concrete prefabricated panels 1 with no concrete on the four sides are maintained to reach the design strength, the reinforced concrete prefabricated panels 1 with no concrete on the four sides are transported and hoisted to the design position, and the position can be placed on the prefabricated part of the superposed beam according to different specific design conditions and can also be connected with other prefabricated panels with a dragon boat hoisting rib in a close splicing manner; the additional steel bars 6 are placed on the upper surface of the prefabricated panels 1 according to the design requirements, and the spacing and anchoring length of the additional steel bars 6 meet the relevant regulations of technical regulations of prefabricated concrete structures (JGJ 1-2014) and technical specifications of buildings of prefabricated concrete structures (GBT 51231-2016). Binding a laminated plate surface rib net 7; hooking and hanging the upper bent hanging end 4a of the keel net of the dragon boat on a longitudinal stress steel bar 7a of the laminated plate gluten; and pouring the concrete of the cast-in-place layer 3 and vibrating to form a structure with stronger bearing capacity, wherein the laminated slabs are closely connected with the laminated beams and the laminated slabs at the spliced seams.
The present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions and alterations can be made without departing from the basic technical concept of the invention as described above, according to the common technical knowledge and conventional means in the field.
Claims (10)
1. The laminated slab is provided with a dragon boat hanging rib for strengthening the bearing capacity of the spliced seam, and comprises a reinforced concrete prefabricated slab with four sides not exposed, an additional reinforcing bar, a laminated slab rib net and a cast-in-place layer; a plurality of additional steel bars are longitudinally arranged on the surface of the upper end of the reinforced concrete prefabricated plate with no concrete on the four sides at intervals, one end of each additional steel bar is connected to the reinforced concrete prefabricated plate with no concrete on the four sides, and the other end of each additional steel bar is connected to the peripheral component; the anchoring lengths of the additional steel bars in the reinforced concrete precast slabs and the peripheral members and the distance between two adjacent additional steel bars on four sides meet the regulations of the technical specification of the prefabricated concrete structure and the technical specification of the prefabricated concrete structure building; the cast-in-place layer is formed by pouring concrete on the reinforced concrete precast slabs with no concrete on four sides and the peripheral members; the cast-in-place layer forms a concrete laminated slab tightly combined with the reinforced concrete prefabricated slabs with no concrete on four sides; the peripheral component is another precast concrete slab, concrete beam or concrete wall with four sides not exposed;
the method is characterized in that: the laminated slab further comprises a dragon boat lifting rib net, and the dragon boat lifting rib net is poured in the reinforced concrete precast slabs with no concrete on the four sides; the dragon boat hoisting rib net is mainly formed by binding a plurality of dragon boat hoisting ribs arranged at intervals longitudinally and a plurality of concrete precast slab distribution reinforcing steel bars arranged at intervals transversely to form a grid shape; the end parts of the reinforced concrete prefabricated plates without the four edges at the two ends of the dragon boat lifting rib are bent upwards to extend out of the reinforced concrete prefabricated plates without the four edges to form an upward bent lifting end, the end part of the upward bent lifting end is processed into a bent hook-shaped structure, the upward bent lifting end extends out of the reinforced concrete prefabricated plates without the four edges to a laminated plate surface rib net in a cast-in-place layer, and the bent hook-shaped structure at the end part of the upward bent lifting end is hooked and hung on longitudinal steel bars of the laminated plate surface rib net; the distribution spacing of the dragon boat hanging bars and the distribution spacing of the longitudinal reinforcing steel bars of the laminated plate surface rib net meet the spacing of stressed reinforcing steel bars in the plate in GB 50010-Buck 2010 standard of concrete structure design.
2. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: the dragon boat reinforcing net also comprises a pressing rib; at least one pressing rib is transversely arranged at the end part, bent upwards, of the edge of the reinforced concrete precast slab, at the two ends of the plurality of spaced keel hanging ribs, the four edges of the end part are not exposed, the pressing rib is bound with the keel hanging ribs, and the pressing rib forms a reinforcing steel bar transversely arranged in a keel hanging rib net.
3. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 2, is characterized in that: the press bars are 2-3 steel bars arranged at intervals of 30-50 mm, and each press bar is bound with the dragon boat lifting bar.
4. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: and the distance between the bent part of the upper bent hoisting end of the dragon boat hoisting bar and the edges of the reinforced concrete precast slabs with four sides not going out is not less than 15 mm.
5. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: the length of the hook-shaped structure at the upper bent hanging end is 5-7 times of the diameter of the dragon boat hanging rib.
6. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: the two ends of the dragon boat lifting rib are bent upwards by 90 degrees at the end parts of the reinforced concrete precast slabs which do not extend out of the four sides.
7. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: the dragon boat hanging ribs 4 of the dragon boat hanging rib net and the longitudinal steel bars of the laminated plate face rib net in the laminated plate face rib net are on the same vertical plane.
8. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: when the dragon boat hanging rib of the dragon boat hanging rib net and the longitudinal steel bar of the laminated plate rib net in the laminated plate rib net are not on the same vertical plane, the bent hanging end of the dragon boat hanging rib is obliquely hooked and hung on the longitudinal steel bar of the laminated plate rib net close to the laminated plate rib net, or the laminated plate rib net is additionally provided with the longitudinal steel bar of the laminated plate rib net on a straight line with the bent hanging ends at the two ends of the dragon boat hanging rib, so that the bent hanging end of the dragon boat hanging rib can be hooked and hung on the longitudinal steel bar of the laminated plate rib net.
9. The laminated slab provided with the dragon boat hanging rib for reinforcing bearing capacity at the spliced seam as claimed in claim 1, is characterized in that: the concrete beam is a cast-in-place beam cathode superposed beam; the superposed beam is a superposed beam edge beam prefabricated body or a superposed beam middle beam prefabricated body; the superposed beam edge beam prefabricated body or the superposed beam middle beam prefabricated body is a cuboid reinforced concrete member with a cuboid notch communicated with the upper part.
10. The method for preparing the composite slab provided with the dragon boat hanging rib for reinforcing the bearing capacity at the spliced seam as claimed in claim 1, is characterized by comprising the following steps:
a. bending the steel bar upwards, and processing the end part of the steel bar into a hook shape to manufacture the dragon boat lifting bar with the upward bending lifting end;
b. binding a dragon boat lifting rib net in a prefabricated plate template of a prefabrication plant, ensuring that an upper bent lifting end extends out of the prefabricated plate to reach the height of the laminated plate surface rib net, pouring after binding the dragon boat lifting rib net, and maintaining to reach the design strength;
c. transporting and hoisting the concrete precast slab with the dragon boat hoisting rib net to a designed position;
d. additional steel bars are arranged on the concrete precast slab with the dragon ship hanging bar net at intervals, and the superposed slab face bar net is bound;
e. hooking and hanging end part hook-shaped structures of upper bent hanging ends at two ends of a dragon boat hanging rib of the dragon boat hanging rib net on longitudinal steel bars of the laminated plate surface rib net;
f. pouring cast-in-place layer concrete on the laminated plate surface rib net and the peripheral component and vibrating to ensure that the laminated plate is tightly connected with the peripheral component, so that the laminated plate which has strong bearing capacity and is provided with a dragon boat hanging rib for strengthening the bearing capacity of the spliced seam is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010549242.1A CN111719753A (en) | 2020-06-16 | 2020-06-16 | Laminated slab with dragon boat hanging ribs for enhancing bearing capacity at abutted seam and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010549242.1A CN111719753A (en) | 2020-06-16 | 2020-06-16 | Laminated slab with dragon boat hanging ribs for enhancing bearing capacity at abutted seam and preparation method thereof |
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| CN111719753A true CN111719753A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010549242.1A Pending CN111719753A (en) | 2020-06-16 | 2020-06-16 | Laminated slab with dragon boat hanging ribs for enhancing bearing capacity at abutted seam and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982773A (en) * | 2021-02-26 | 2021-06-18 | 重庆中科建筑科技(集团)有限公司 | Construction method of prefabricated reinforced concrete composite slab with extending reinforcing steel bars |
| CN113202208A (en) * | 2021-04-30 | 2021-08-03 | 福州大学 | Assembled steel-concrete combined shear wall and construction method thereof |
| CN114215249A (en) * | 2022-01-06 | 2022-03-22 | 西安建筑科技大学 | Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof |
| CN114351923A (en) * | 2021-12-09 | 2022-04-15 | 正方利民（天镇）建筑工业化有限公司 | Prestressed PC truss bidirectional laminated slab |
| CN114351924A (en) * | 2021-12-09 | 2022-04-15 | 正方利民（天镇）建筑工业化有限公司 | Prestressed PC truss one-way laminated slab |
| CN115288347A (en) * | 2022-08-24 | 2022-11-04 | 金鹏装配式建筑有限公司 | Steel pipe truss prestressed concrete superimposed sheet |
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2020
- 2020-06-16 CN CN202010549242.1A patent/CN111719753A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982773A (en) * | 2021-02-26 | 2021-06-18 | 重庆中科建筑科技(集团)有限公司 | Construction method of prefabricated reinforced concrete composite slab with extending reinforcing steel bars |
| CN113202208A (en) * | 2021-04-30 | 2021-08-03 | 福州大学 | Assembled steel-concrete combined shear wall and construction method thereof |
| CN114351923A (en) * | 2021-12-09 | 2022-04-15 | 正方利民（天镇）建筑工业化有限公司 | Prestressed PC truss bidirectional laminated slab |
| CN114351924A (en) * | 2021-12-09 | 2022-04-15 | 正方利民（天镇）建筑工业化有限公司 | Prestressed PC truss one-way laminated slab |
| CN114215249A (en) * | 2022-01-06 | 2022-03-22 | 西安建筑科技大学 | Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof |
| CN115288347A (en) * | 2022-08-24 | 2022-11-04 | 金鹏装配式建筑有限公司 | Steel pipe truss prestressed concrete superimposed sheet |
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