CN220434013U - Precast slab for laminated slab and laminated slab - Google Patents
Precast slab for laminated slab and laminated slab Download PDFInfo
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- CN220434013U CN220434013U CN202321531063.0U CN202321531063U CN220434013U CN 220434013 U CN220434013 U CN 220434013U CN 202321531063 U CN202321531063 U CN 202321531063U CN 220434013 U CN220434013 U CN 220434013U
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- Panels For Use In Building Construction (AREA)
Abstract
The utility model discloses a precast slab for a laminated slab, which comprises a precast slab, a plurality of steel bar trusses, a plurality of connecting components arranged on the precast slab and a cast-in-situ concrete layer formed on one side of the precast slab. The steel bar trusses are arranged on the surface of the precast slab facing the cast-in-situ concrete layer, and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer; the connecting component is connected with the steel bar truss and is used for fixing the steel bar truss on the precast slab; and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer. The precast slab for the superimposed sheet is different from the conventional superimposed sheet of the embedded steel bar trusses, and the precast slab is characterized in that the plurality of steel bar trusses are uniformly fixed on the surface of the precast slab through the plurality of connecting parts, so that the thickness of the concrete precast slab can be greatly reduced, the overall weight of the precast slab is obviously reduced, the precast slab is more convenient to transport, hoist and mount and construct, quick installation can be realized, and safety is ensured.
Description
Technical Field
The utility model belongs to the technical field of assembled building structures, and particularly relates to a prefabricated plate for a laminated plate and the laminated plate.
Background
In the construction method of the traditional floor plate in the prior art, components such as a formwork and a binding reinforcing steel bar net are required to be supported on a construction site, then concrete is poured on site, and after the concrete is solidified and reaches a certain strength, the templates around the column are removed. The construction method of the cast-in-place floor slab has the problems of low construction efficiency, complex flow and long construction period.
The laminated slab is an assembled integral floor slab formed by laminating precast slabs and cast-in-situ concrete layers. The composite floor slab has good integrity, the upper and lower surfaces of the slab are smooth, the decoration of the finish layer is convenient, and the composite floor slab is suitable for high-rise buildings and large-bay buildings with high overall rigidity requirements. The reinforced truss concrete superimposed sheet is of a superimposed sheet type mainly used in China, and the traditional reinforced truss concrete superimposed sheet has the defects that the self weight of the traditional precast slab is large due to the self structure of the traditional precast slab, so that the installation and transportation efficiency is affected.
Disclosure of Invention
The utility model aims to solve the technical problems of low construction efficiency and long construction period of the traditional cast-in-situ floor slab technology and large dead weight caused by the self-construction of the precast slab, and provides a precast slab and a superimposed sheet for the superimposed sheet, which have smaller precast slab weight, are convenient to install and transport and improve the installation and transportation efficiency compared with the traditional structure; compared with the cast-in-situ floor slab technology, the utility model has the advantages of higher construction efficiency and short construction period.
In order to solve the problems, the utility model is realized according to the following technical scheme:
in a first aspect, the present utility model provides a prefabricated panel for a laminated slab, the prefabricated panel comprising:
a plurality of steel bar trusses, wherein the steel bar trusses are arranged on the surface of the precast slab;
the connecting parts are arranged on the precast slabs and connected with the steel bar trusses, and the connecting parts are used for fixing the steel bar trusses on the precast slabs.
With reference to the first aspect, the present utility model also provides the 1 st preferred embodiment of the first aspect, specifically, the thickness of the prefabricated panel is 15-20 mm.
With reference to the first aspect, the utility model also provides a 2 nd preferred embodiment of the first aspect, specifically, the prefabricated slab includes a plurality of first steel bar trusses arranged side by side at intervals along the width direction of the prefabricated slab, and a plurality of second steel bar trusses arranged side by side at intervals along the length direction of the prefabricated slab;
the heights of the second steel bar trusses are matched with the hollowed-out parts of the first steel bar trusses, and each second steel bar truss is sequentially penetrated with a plurality of first steel bar trusses which are arranged side by side at intervals;
the second steel bar truss is connected with the first steel bar truss, and the first steel bar truss is connected with the connecting component.
With reference to the first aspect, the present utility model further provides a 3 rd preferred embodiment of the first aspect, specifically, the prefabricated panel for a laminated slab includes:
the upper layer reinforcing steel bar net is formed by crisscross welding a plurality of reinforcing steel bars, and is connected with the upper part of the reinforcing steel bar truss;
the lower layer steel bar net is formed by crisscross welding of a plurality of steel bars, the plurality of steel bars of the lower layer steel bar net penetrate through hollowed-out parts of the plurality of steel bar trusses, the lower layer steel bar net is positioned at the lower parts of the plurality of steel bar trusses, and the lower layer steel bar net is connected with the steel bar trusses;
the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net are respectively provided with a first part which is pre-buried in the exterior casting concrete and a second part which is exposed from the side wall surface of the exterior casting concrete.
With reference to the first aspect, the present utility model further provides a 4 th preferred embodiment of the first aspect, specifically, the connecting component includes:
a connector configured to be receivable in a prefabricated hole of the prefabricated panel; the connector has a hook portion and a threaded rod portion configured to be connected with a lock nut of one side of the prefabricated panel;
the lower part of the steel bar truss is hooked by the hook part of the connecting piece, and the steel bar truss is fixed on the precast slab through the connecting piece.
Further, the present utility model also provides a more preferred embodiment, and specifically, the connecting member includes:
the base plate is arranged between the lock nut and the precast slab, and the threaded rod part of the connecting piece penetrates through the base plate and is exposed out of the surface of the base plate.
With reference to the first aspect, the present utility model further provides a 5 th preferred embodiment of the first aspect, specifically, the connecting component includes:
the lower end of the pressing piece is provided with a grooving structure capable of containing the steel bars of the steel bar truss; the pressing piece is provided with a strip-shaped hole which penetrates through the pressing piece up and down;
a bolt, the threaded shaft of which is configured to be received in the prefabricated hole of the prefabricated plate, the threaded shaft of which penetrates through the prefabricated plate and is exposed on the surface of the prefabricated plate, and the threaded shaft of which is adapted to the strip-shaped hole of the pressing piece;
the pressing piece penetrates through the hollowed-out part of the steel bar truss, and the grooving structure of the pressing piece is sleeved with the steel bars of the steel bar truss, which are abutted against the precast slab; the pressing piece is sleeved on the threaded rod portion of the bolt through the strip-shaped hole of the pressing piece, the pressing piece is locked by the nut of the bolt, and then the steel bar truss is fixed on the precast slab through the pressing piece.
Further, the present utility model also provides a more preferred embodiment, and specifically, the connecting member includes:
the backing plate is arranged between the head of the bolt and the precast slab, and the threaded rod of the bolt penetrates through the backing plate.
Further, the present utility model also provides a more preferred embodiment, specifically, the pressing member includes:
the first side plate, both side end portions of the first side plate are respectively provided with a protruding part, and a hollow space is formed between the two protruding parts of the first side plate to form the grooving structure
The second side plates are arranged at intervals corresponding to the second side plates, protruding parts are respectively arranged at the two side ends of the second side plates, and two protruding parts of the second side plates are hollowed out to form the grooving structure;
the two connecting plates are connected with the first side plate on one side wall, and the second side plate on the other opposite side wall;
the two connecting plates are arranged at intervals, and the strip-shaped holes are formed through the side wall of the first side plate, the side wall of the second side plate and the side walls of the two connecting plates.
In a second aspect, the present utility model also provides a laminated slab, including the prefabricated slab for laminated slab according to the first aspect, further including a cast-in-place concrete layer formed on a side of the prefabricated slab where the steel bar trusses are disposed, the plurality of steel bar trusses being buried in the cast-in-place concrete layer.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a precast slab for a laminated slab, which comprises a precast slab, a plurality of steel bar trusses, a plurality of connecting components arranged on the precast slab and a cast-in-situ concrete layer formed on one side of the precast slab. The steel bar trusses are arranged on the surface of the precast slab facing the cast-in-situ concrete layer, and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer; the connecting component is connected with the steel bar truss and is used for fixing the steel bar truss on the precast slab; and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer.
(1) The prefabricated plate for the superimposed sheet disclosed by the utility model has the advantages that the prefabricated plate is used for replacing the traditional wood/aluminum template as a bottom template, the dismantling is not needed, the construction process is simplified, and compared with the cast-in-situ floor technology, the prefabricated plate for the superimposed sheet has the advantages of higher construction efficiency and short construction period; and meets the assembly rate requirement, saves a great deal of labor and material cost and is more environment-friendly.
(2) The prefabricated slab is different from the traditional prefabricated slab of the embedded steel bar truss, the plurality of steel bar trusses are uniformly fixed on the surface of the prefabricated slab through the plurality of connecting parts, and the steel bar trusses are fixed in a non-embedded mode, so that the thickness of the concrete prefabricated slab can be greatly reduced, the overall weight of the prefabricated slab is obviously reduced, the prefabricated slab is more convenient to transport, hoist and mount and construct, quick installation can be realized, and safety is ensured.
(3) The laminated slab takes the cast-in-situ concrete layer at the later stage as a main building material, and the precast slab is the same as a protective material at the later stage to protect the cast-in-situ concrete layer and the steel bar truss.
The utility model also provides a laminated slab, which is different from the traditional laminated slab of the embedded steel bar trusses, and the utility model uniformly fixes the plurality of steel bar trusses on the surface of the precast slab through a plurality of connecting parts instead of fixing the steel bar trusses in an embedded mode, so that the thickness of the concrete precast slab can be greatly reduced, and the overall weight of the precast slab is obviously reduced. The cast-in-situ concrete layer is formed by pouring concrete after the precast slab component is constructed and installed on site, and the weight of the precast slab component is not increased, so that the precast slab is more convenient to transport, hoist and construct in the construction process, and the precast slab can be quickly installed and is safe and guaranteed.
Drawings
The utility model is described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic structural view of a conventional steel bar truss composite slab;
FIG. 2 is a schematic view of the layer cross section of a prefabricated panel for laminated sheets in which the present utility model is applied;
FIG. 3 is a schematic view showing the structure of a prefabricated panel according to the present utility model;
FIG. 4 is a schematic view showing the structure of a prefabricated panel with hook connectors according to the present utility model;
FIG. 5 is a schematic side view of a prefabricated panel with hook connectors according to the present utility model;
FIG. 6 is a schematic plan view of a prefabricated panel with a press-fit member according to the present utility model;
FIG. 7 is an enlarged schematic view of section A of the present utility model;
FIG. 8 is a schematic front view of a compression fitting of the present utility model;
in the figure:
10-prefabricated panels;
20-steel bar trusses, 21-upper steel bar meshes and 22-lower steel bar meshes;
30-a cast-in-situ concrete layer;
40-connecting parts, 41-connecting parts, 411-hook parts, 42-pressing parts, 421-grooving structures, 422-strip-shaped holes and 43-backing plates.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Referring to fig. 1, a prefabricated panel of a conventional steel bar truss composite panel includes a prefabricated layer and a steel bar truss pre-buried in the prefabricated layer, the truss steel bar having a first portion pre-buried in the prefabricated layer and a second portion exposed from a surface of the prefabricated layer.
The applicant researches show that the prefabricated layer is made of concrete material and is mostly made of high-strength concrete material by dense filling. To be able to adequately wrap the first portion of the steel bar truss to ensure the bonding strength of the truss steel bars and the structural strength of the prefabricated panel, a larger thickness is often required for the prefabricated layer, which results in an increase in the weight of the prefabricated panel.
The applicant indicates that the lower chord steel bars in the steel bar truss framework of the traditional laminated slab are required to be buried in the prefabricated layer, so that the thickness of the prefabricated layer is increased, the concrete material is large, and the weight of the prefabricated slab is comprehensively increased. The prefabricated plates are placed and transported in a stacking mode, and the steel bar truss of the bottom-layer prefabricated plate is easy to deform due to the fact that the prefabricated plates with large weight are stacked, and great inconvenience is caused to the processes of transportation, installation and the like.
In order to solve the above problems, the present utility model provides a prefabricated panel for a laminated slab, the prefabricated panel comprising: a plurality of steel bar trusses, wherein the steel bar trusses are arranged on the surface of the precast slab; the connecting parts are arranged on the precast slabs and connected with the steel bar trusses, and the connecting parts are used for fixing the steel bar trusses on the precast slabs.
In particular, the present utility model describes a prefabricated panel for a laminated slab in detail with reference to its specific implementation application on the laminated slab and the corresponding structure.
Example 1
As shown in fig. 1 to 8, a preferable structure of a prefabricated panel for a laminated slab according to the present utility model.
Wherein the prefabricated panels are applied in a laminated slab. The laminated slab includes a prefabricated slab 10, a plurality of steel bar trusses 20, a plurality of connection members 40 provided on the prefabricated slab, and a cast-in-place concrete layer 30 formed on one side of the prefabricated slab. The steel bar trusses are arranged on the surface of the precast slab facing the cast-in-situ concrete layer, and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer; the connecting component is connected with the steel bar truss and is used for fixing the steel bar truss on the precast slab; and a plurality of steel bar trusses are buried in the cast-in-situ concrete layer.
Specifically, the precast slab is formed by concrete casting. When the prefabricated plate is formed, a plurality of mold baffles are used for enclosing to form a pouring space for pouring the formed prefabricated plate. On the other hand, if an installation structure, such as a preformed hole, a pre-buried bolt and the like, is required to be reserved for the connecting part, a corresponding forming die tool is directly arranged in the pouring space; yet alternatively, pre-buried bolts may be placed in the casting space prior to casting, as would be accomplished by one skilled in the art.
It should be noted that in the art, the precast slab and the cast-in-place concrete layer are formed separately. It will be appreciated that the prefabricated panels are prefabricated concrete panels produced and formed in prefabricated fields and are transported directly to the construction site for installation. And (3) transporting the precast slab provided with the steel bar truss to a construction site for installation. And pouring concrete materials on site on the surface of the precast slab, burying the steel bar truss and the precast slab by the concrete materials, and finally forming a cast-in-situ concrete layer after solidification.
Therefore, the technical scheme of the utility model is different from the traditional superimposed sheet of the embedded steel bar trusses, the plurality of steel bar trusses are uniformly fixed on the surface of the precast slab through the plurality of connecting parts, and the steel bar trusses are fixed in a non-embedded mode, so that the thickness of the concrete precast slab can be greatly reduced, the overall weight of the precast slab is obviously reduced, the precast slab is more convenient to transport, hoist and mount and construct, quick installation can be realized, and the safety is ensured. On the other hand, the laminated slab takes the cast-in-situ concrete layer at the later stage as a main building material, and the precast slab at the later stage is as a protective material for protecting the cast-in-situ concrete layer and the steel bar truss.
In a preferred implementation, the thickness of the prefabricated plate can be 15-20 mm due to the non-embedded combination structure of the steel bar truss and the prefabricated plate. The prefabricated plate thickness of the traditional laminated plate is far greater than that of the utility model under the same area, and the weight is several times of that of the utility model.
The prefabricated slab with thinner thickness can be realized, and great convenience is provided for storage, transportation and installation of the superimposed sheet.
It should be noted that the technical scheme has the following unexpected technical effects:
(1) Most of the components (beams, columns, walls and floors) of the conventional fabricated building are manufactured and molded in factories and then transported to the site for installation, but in the site installation, the quality of the connecting nodes among the building components is difficult to guarantee, and serious quality defects such as leakage and the like can be caused. By adopting the technical scheme of the patent, the precast slab part of the laminated slab is precast on site, the core main body of the component also needs to be cast on site, and the component form a whole through cast on site. Therefore, the final construction quality can be ensured to be not greatly different from that of the full cast-in-situ type construction.
(2) As noted in the background section of this application, conventional fabricated building components, concrete materials are much larger than the building components of this patent, and components prefabricated in the factory by conventional techniques are heavy, resulting in high transportation costs. By adopting the technical scheme of the patent, the dead weight of the prefabricated part is reduced, the weight is lighter, and the transportation cost can be greatly reduced.
In the technical field of the utility model, the section of the steel bar truss is of a triangular structure, and the steel bar truss comprises an upper chord steel bar, two lower chord steel bars and two continuous saw-tooth web bars. Wherein, two lower chord steel bars are arranged at intervals, and an upper chord steel bar is positioned above the middle parts of the two lower chord steel bars, and the upper chord steel bars and the lower chord steel bars are welded and fixed through web bars so as to form a long strip-shaped hollowed-out three-dimensional structure.
As shown in fig. 6, in some examples of the present utility model, the prefabricated panel for a composite slab includes a plurality of first steel bar trusses arranged side by side at intervals in a width direction of the prefabricated panel, and a plurality of second steel bar trusses arranged side by side at intervals in a length direction of the prefabricated panel; the heights of the second steel bar trusses are matched with the hollowed-out parts of the first steel bar trusses, and each second steel bar truss is sequentially penetrated with a plurality of first steel bar trusses which are arranged side by side at intervals;
the second steel bar truss is connected with the first steel bar truss, and the first steel bar truss is connected with the connecting component.
In combination with the steel bar truss structure, it can be understood that the hollowed-out part refers to a gap formed by the web bar and the lower chord steel bar, and the web bar is continuously saw-toothed, and the part of the web bar and the lower chord steel bar form a hollowed-out gap similar to a triangle. So that the second steel bar truss with small specification can pass through the hollowed-out part of the first steel bar truss to form a crisscross steel bar truss structure.
By the arrangement of the utility model, the steel bar truss and the cast-in-situ concrete layer form a whole, and the steel bar truss improves the structural strength of the cast-in-situ concrete layer, thereby greatly endowing the laminated slab with excellent mechanical properties.
In a preferred embodiment, as shown in fig. 6, one superimposed sheet includes 3 first reinforcing steel trusses arranged side by side at intervals along the width direction of the prefabricated sheet, and 3 second reinforcing steel trusses arranged side by side at intervals along the length direction of the prefabricated sheet.
Wherein, two first steel bar trusses set up respectively in prefabricated plate's outward flange department, and a first steel bar truss is located between above-mentioned two first steel bar trusses. The 3 second steel bar trusses are distributed on the precast slab at equal intervals.
Specifically, the number of the first/second steel bar trusses can be three, five or other numbers, and the first/second steel bar trusses can be selected according to the specification of the precast slab.
In one embodiment, the prefabricated panel for a laminated slab includes:
the upper layer reinforcing steel bar net 21 is formed by crisscross welding a plurality of reinforcing steel bars, and is connected with the upper part of the steel bar truss;
the lower layer reinforcing steel bar net 22 is formed by crisscross welding of a plurality of reinforcing steel bars, the plurality of reinforcing steel bars of the lower layer reinforcing steel bar net penetrate through hollowed-out parts of the plurality of reinforcing steel bar trusses, the lower layer reinforcing steel bar net is positioned at the lower parts of the plurality of reinforcing steel bar trusses, and the lower layer reinforcing steel bar net is connected with the reinforcing steel bar trusses;
the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net are respectively provided with a first part pre-buried in the cast-in-situ concrete layer and a second part exposed from the surface of the side wall of the cast-in-situ concrete layer.
Specifically, the upper layer reinforcing mesh and the lower layer reinforcing mesh can be fixed on the reinforcing truss by welding or binding. It should be noted that, the purpose of setting the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net is finally to realize the corresponding function of superimposed sheet, and upper layer reinforcing steel bar net and lower layer reinforcing steel bar net are reinforcing concrete bearing capacity and set up the reinforcing steel bar in the concrete. On the other hand, the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net are used for enhancing the structural strength between adjacent laminated plates, the laminated plates can be sequentially and tightly paved together before pouring, the second parts of the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net can be connected into a whole in a welding mode, and then a cast-in-place concrete layer is poured.
In one implementation, as shown in fig. 3 to 5, the connection part includes:
a connector 41 configured to be receivable in a prefabricated hole of the prefabricated panel; the connector has a hook 411 and a threaded shaft configured to be coupled with a lock nut of one side of the prefabricated panel;
the lower part of the steel bar truss is hooked by the hook part of the connecting piece, and the steel bar truss is fixed on the precast slab through the connecting piece.
In the utility model, the connecting piece is made of a high-strength metal material. It is understood that the shape of the connecting piece is like a hook, the hook is used for hooking the lower chord steel bar of the steel bar truss, the threaded rod part of the connecting piece passes through the prefabricated hole of the prefabricated plate, and the connecting piece and the lower chord steel bar of the steel bar truss are locked on the surface of the prefabricated plate through screw-in of the nut.
In a preferred embodiment, the connecting member includes a spacer 43 disposed between the lock nut and the prefabricated panel, and the threaded shaft portion of the connecting member is inserted through the spacer and exposed from the surface of the spacer. Through the setting of backing plate, receive the atress by the backing plate, reduce stress concentration in the prefabricated hole periphery of prefabricated plate. Because the thickness of prefabricated plate is thinner, in order to avoid the nut locking, make prefabricated plate part around the prefabricated hole cause the destruction easily.
During concrete installation, in order to effectively and reliably fix the steel bar truss, two lower chord steel bars of the steel bar truss are respectively required to be fixed by using a plurality of connecting pieces, so that the steel bar truss is prevented from being shifted, misplaced and the like.
Example two
A prefabricated panel for a laminated sheet, a laminated sheet according to the second embodiment is the same as the prefabricated panel for a laminated sheet, a laminated sheet according to the first embodiment in structure and principle, except that the present utility model provides another preferred embodiment of the connecting member.
As shown in fig. 6 to 8, the connecting member 40 includes a press-fit piece 42 and a bolt. The lower end of the pressing piece is provided with a grooving structure 421 capable of containing the steel bars of the steel bar truss; the press-fit piece is provided with a strip-shaped hole 422 penetrating the press-fit piece up and down. The threaded rod part of the bolt is configured to be received in the prefabricated hole of the prefabricated plate, penetrates through the prefabricated plate and is exposed on the surface of the prefabricated plate, and is matched with the strip-shaped hole of the pressing piece;
the pressing piece penetrates through the hollowed-out part of the steel bar truss, and the grooving structure of the pressing piece is sleeved with the steel bars of the steel bar truss, which are abutted against the precast slab; the pressing piece is sleeved on the threaded rod portion of the bolt through the strip-shaped hole of the pressing piece, the pressing piece is locked by the nut of the bolt, and then the steel bar truss is fixed on the precast slab through the pressing piece.
In a preferred embodiment, the connection member includes a pad 43 disposed between the head of the bolt and the prefabricated panel, through which the threaded shaft of the bolt passes. Through the setting of backing plate, receive the atress by the backing plate, reduce stress concentration in the prefabricated hole periphery of prefabricated plate. Because the thickness of prefabricated plate is thinner, in order to avoid the nut locking, make prefabricated plate part around the prefabricated hole cause the destruction easily.
It can be understood that the grooving structure is used for withholding two lower chord steel bars of the steel bar truss, two lower chord steel bars of the steel bar truss can be fixed simultaneously through one pressing piece, and two connecting pieces with hook parts are not needed to fix the two lower chord steel bars of the steel bar truss respectively, so that the operation intensity is reduced, and the installation efficiency of the steel bar truss is improved.
In one implementation, the compression member includes:
the first side plate, both side end portions of the first side plate are respectively provided with a protruding part, and a hollow space is formed between the two protruding parts of the first side plate to form the grooving structure
The second side plates are arranged at intervals corresponding to the second side plates, protruding parts are respectively arranged at the two side ends of the second side plates, and two protruding parts of the second side plates are hollowed out to form the grooving structure;
the two connecting plates are connected with the first side plate on one side wall, and the second side plate on the other opposite side wall;
the two connecting plates are arranged at intervals, and the strip-shaped holes are formed through the side wall of the first side plate, the side wall of the second side plate and the side walls of the two connecting plates.
Specifically, the first side plate, the second side plate and the connecting plate are all made of metal materials, such as steel, aluminum alloy and the like. The first side plate, the second side plate and the connecting plate are connected through welding.
The connecting component of the second embodiment has obvious function difference from the connecting component of the first embodiment, and the connecting component of the first embodiment uses the connecting piece with the hook part, so that a plurality of connecting pieces are required to be distributed for connecting and fixing the steel bar truss for comprehensively fixing the steel bar truss. Therefore, a plurality of reserved holes meeting the installation requirement are reserved on the prefabricated plate, the production difficulty of the prefabricated plate is greatly increased, and higher requirements are placed on the positions of the holes and the relative position accuracy between the holes. On the other hand, the installation workload of the connecting piece is huge, and on the other hand, once the prefabricated holes are shaped, the installation position of the steel bar truss cannot be adjusted.
Therefore, the utility model provides a connecting component which is simpler and more convenient to use and reliable to fix, and particularly, the pressing piece of the connecting component can be fixed by only one bolt, and for this purpose, only one prefabricated hole is correspondingly arranged on the prefabricated plate. In still another aspect, when the two lower chord steel bars of the steel bar truss are fixed, the grooving structure is utilized to fix the two lower chord steel bars. In the second aspect, the pressing piece is provided with the strip-shaped hole, so that the bolt can be installed, larger installation errors are compatible, and the position accuracy of the prefabricated hole is reduced. In the third aspect, the strip-shaped holes and the bolts are adopted for alignment and installation, namely, the pressing piece can be used for position adjustment in a certain range, and the second embodiment is different from the connecting piece with the hook part, and can be used for adjusting the position of the steel bar truss on the precast slab according to the requirement.
Example III
A prefabricated panel for a laminated sheet, a laminated sheet according to the third embodiment is identical to the prefabricated panel for a laminated sheet, a laminated sheet according to the first embodiment or the second embodiment in structure and principle, except that the present utility model provides a preferred embodiment of the prefabricated panel. Specifically, the precast slab is a slab body formed by casting ductile concrete.
Wherein, the raw materials of the ductile concrete comprise cement, fine mineral composite materials, river sand and composite reinforced fibers. Wherein the mass ratio of the cement to the fine mineral composite material to the river sand is 1:0.88:2.33, and the water-cement ratio is 0.18; the volume doping amount of the composite reinforcing fiber is 2.00%.
In one implementation, the cement is p.ii.42.5r portland cement.
In one embodiment, the fine mineral composite is composed of silica powder and S95 mineral powder, which has a certain fineness and activity of the mineral admixture. Specifically, the silicon powder is Hkem951 grade silicon micro powder, and the mass ratio of the silicon powder to S95 mineral powder is 3:5.
In one implementation, the fine aggregate is river sand with the particle size of 0.18-0.30 mm; the water reducing rate of the water reducing agent is not less than 30 percent.
In one implementation, the composite reinforcing fiber consists of steel fiber, PVA fiber and glass fiber, wherein the volume doping amount of the steel fiber is 1.00%; the volume doping amount of the PVA fiber is 0.50%; the volume doping amount of the glass fiber is 0.50%.
Wherein, the diameter of the steel fiber is 0.2mm, the length is 13mm, and the tensile strength is 2850MPa. PVA fiber has a diameter of 0.2mm, a fiber length of 12mm and a tensile strength of 2024MPa. The glass fiber has a diameter of 0.014mm and a length of 18mm, and has a tensile strength of 1700MPa.
(1) Test of prefabricated Panel products
The test pieces were 100mm by 400mm in size and 300mm in clear span. According to the proportion, 3 parallel test pieces are poured, and the test result is an average value of the 3 test pieces. After the test piece is molded, standing and curing for 2 days under the indoor natural condition, demolding, curing for 24 days in a standard curing room with the temperature of 20 ℃ and the relative humidity of more than 95%, and finally, continuing to cure for 2 days under the indoor natural condition, and then starting the test. Three (3) cube test pieces of 100mm by 100mm were simultaneously cast for measuring the compressive strength of the 28d cube.
Comparing the samples: the formulation is the same as in example three, the fibers are steel fibers only, and the volume doping amount of the steel fibers is 2.00%.
Four-point bending loading test is adopted, the distance between the loading point and the support is 50mm, and the loading device is an MTS fully-closed electrohydraulic servo tester. The displacement control mode is adopted for loading, the loading rate is 0.10mm/min from the beginning of loading to before reaching the peak load, and the loading rate is 0.60mm/min after the peak load.
(2) Experimental results:
2.1 the measured average value of the compressive strength of the test piece cube according to the utility model is 138.51MPa. Experimental research shows that in the process of expanding the cube micro cracks, the composite reinforced fiber has good constraint, bridging effect and crack control capability, and has a certain improvement effect on peak stress.
In contrast, the compressive strength of the singly doped steel fiber cubes was found to be 114.21MPa as an average.
2.2 average load and deflection
| Sample of | Initial crack load/KN | Deflection of initial crack/mm | Peak load/KN | Peak deflection/mm |
| Test piece according to the utility model | 38.60 | 0.86 | 49.21 | 1.67 |
| Sample test piece for comparison | 17.84 | 0.63 | 24.58 | 1.22 |
The test result shows that compared with a single-doped steel fiber test piece, the peak load and the peak deflection of the test piece cube are obviously increased. The test piece cube can still keep higher bending bearing capacity after reaching peak load, and the deformation capacity after splitting can be effectively improved by mixing the fibers in the process of continuously pulling out or breaking the fibers in the loading process, so that the toughening effect is remarkable.
On the other hand, the selected composite fibers are mixed, wherein the diameters of the steel fibers and the PVA fibers are large, and the indentation depth is increased; the indentation depth is increased, the interface bonding area and the bond strength of the fiber and the prefabricated plate matrix are increased, the fiber is not easy to pull out from the matrix, and the reinforcing and toughening effects are improved.
The lengths of the PVA fibers, the steel fibers and the glass fibers are gradually increased, so that the fiber anchoring effect is improved, the interfacial adhesion force between the fibers and the matrix is improved, the energy required by pulling out or breaking the fibers is increased, and the reinforcing and toughening effects are improved.
Other structures of a prefabricated panel for a laminated slab according to the present embodiment are known in the art.
The present utility model is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present utility model are within the scope of the technical proposal of the present utility model.
Claims (10)
1. A prefabricated panel for a laminated slab, the prefabricated panel comprising:
a plurality of steel bar trusses, wherein the steel bar trusses are arranged on the surface of the precast slab;
the connecting parts are arranged on the precast slabs and connected with the steel bar trusses, and the connecting parts are used for fixing the steel bar trusses on the precast slabs.
2. A prefabricated panel for laminated sheets according to claim 1, wherein:
the thickness of the precast slab is 15-20 mm.
3. A prefabricated panel for laminated sheets according to claim 1, wherein:
the precast slab comprises a plurality of first steel bar trusses which are arranged side by side at intervals along the width direction of the precast slab and a plurality of second steel bar trusses which are arranged side by side at intervals along the length direction of the precast slab;
the heights of the second steel bar trusses are matched with the hollowed-out parts of the first steel bar trusses, and each second steel bar truss is sequentially penetrated with a plurality of first steel bar trusses which are arranged side by side at intervals;
the second steel bar truss is connected with the first steel bar truss, and the first steel bar truss is connected with the connecting component.
4. A prefabricated panel for laminated sheets according to claim 1, wherein the prefabricated panel for laminated sheets comprises:
the upper layer reinforcing steel bar net is formed by crisscross welding a plurality of reinforcing steel bars, and is connected with the upper part of the reinforcing steel bar truss;
the lower layer steel bar net is formed by crisscross welding of a plurality of steel bars, the plurality of steel bars of the lower layer steel bar net penetrate through hollowed-out parts of the plurality of steel bar trusses, the lower layer steel bar net is positioned at the lower parts of the plurality of steel bar trusses, and the lower layer steel bar net is connected with the steel bar trusses;
the upper layer reinforcing steel bar net and the lower layer reinforcing steel bar net are respectively provided with a first part which is pre-buried in the exterior casting concrete and a second part which is exposed from the side wall surface of the exterior casting concrete.
5. A prefabricated panel for laminated sheets according to claim 1, wherein the connecting member comprises:
a connector configured to be receivable in a prefabricated hole of the prefabricated panel; the connector has a hook portion and a threaded rod portion configured to be connected with a lock nut of one side of the prefabricated panel;
the lower part of the steel bar truss is hooked by the hook part of the connecting piece, and the steel bar truss is fixed on the precast slab through the connecting piece.
6. A prefabricated panel for laminated sheets according to claim 5, wherein the connecting member comprises:
the base plate is arranged between the lock nut and the precast slab, and the threaded rod part of the connecting piece penetrates through the base plate and is exposed out of the surface of the base plate.
7. A prefabricated panel for laminated sheets according to claim 1, wherein the connecting member comprises:
the lower end of the pressing piece is provided with a grooving structure capable of containing the steel bars of the steel bar truss; the pressing piece is provided with a strip-shaped hole which penetrates through the pressing piece up and down;
a bolt, the threaded shaft of which is configured to be received in the prefabricated hole of the prefabricated plate, the threaded shaft of which penetrates through the prefabricated plate and is exposed on the surface of the prefabricated plate, and the threaded shaft of which is adapted to the strip-shaped hole of the pressing piece;
the pressing piece penetrates through the hollowed-out part of the steel bar truss, and the grooving structure of the pressing piece is sleeved with the steel bars of the steel bar truss, which are abutted against the precast slab; the pressing piece is sleeved on the threaded rod portion of the bolt through the strip-shaped hole of the pressing piece, the pressing piece is locked by the nut of the bolt, and then the steel bar truss is fixed on the precast slab through the pressing piece.
8. A prefabricated panel for laminated sheets according to claim 7, wherein the connecting member comprises:
the backing plate is arranged between the head of the bolt and the precast slab, and the threaded rod of the bolt penetrates through the backing plate.
9. A prefabricated panel for laminated sheets according to claim 7, wherein the laminated member comprises:
the first side plate, both side end portions of the first side plate are respectively provided with a protruding part, and a hollow space is formed between the two protruding parts of the first side plate to form the grooving structure
The second side plates are arranged at intervals corresponding to the second side plates, protruding parts are respectively arranged at the two side ends of the second side plates, and two protruding parts of the second side plates are hollowed out to form the grooving structure;
the two connecting plates are connected with the first side plate on one side wall, and the second side plate on the other opposite side wall;
the two connecting plates are arranged at intervals, and the strip-shaped holes are formed through the side wall of the first side plate, the side wall of the second side plate and the side walls of the two connecting plates.
10. A laminated slab comprising the prefabricated slab for laminated slab according to any one of claims 1 to 9, and further comprising a cast-in-place concrete layer formed on a side of the prefabricated slab on which the reinforcing steel bar trusses are provided, the plurality of reinforcing steel bar trusses being buried in the cast-in-place concrete layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321531063.0U CN220434013U (en) | 2023-06-15 | 2023-06-15 | Precast slab for laminated slab and laminated slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321531063.0U CN220434013U (en) | 2023-06-15 | 2023-06-15 | Precast slab for laminated slab and laminated slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220434013U true CN220434013U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321531063.0U Active CN220434013U (en) | 2023-06-15 | 2023-06-15 | Precast slab for laminated slab and laminated slab |
Country Status (1)
| Country | Link |
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| CN (1) | CN220434013U (en) |
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2023
- 2023-06-15 CN CN202321531063.0U patent/CN220434013U/en active Active
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