CN212641881U - Bidirectional laminated slab concrete structure - Google Patents

Abstract

The utility model belongs to the technical field of concrete structure, especially, relate to a two-way superimposed sheet concrete structure, including the prefabricated layer of first superimposed sheet, the prefabricated layer of second superimposed sheet, the cast-in-place layer of superimposed sheet and flexible anti structure of splitting. It has the following advantages: firstly, a supporting frame body of a bottom template at a joint does not need to be erected in construction, so that the construction efficiency is improved; secondly, the construction space is saved, the man passing space and the material transportation space in the construction process are increased, and the construction efficiency is indirectly improved; thirdly, the floor has a great effect on resisting the hogging moment mainly borne by the floor; fourthly, the bearing capacity of the place with the maximum bending moment of the floor slab can be met by considering the number of the support frame bodies at the proper integral joint; fifthly, the joint of the laminated slab prefabricated layer and the laminated slab cast-in-place layer is filled and treated by adopting a flexible anti-cracking structure, so that the risk of cracks on the joint surface of new and old concrete is reduced, and the engineering quality is improved.

Description

Bidirectional laminated slab concrete structure

Technical Field

The utility model belongs to the technical field of concrete structure, especially, relate to a two-way superimposed sheet concrete structure.

Background

Along with the steady and rapid development of social economy in China in recent years, the problems of disappearing population dividend and high energy consumption in the construction industry are highlighted day by day, and the requirements of governments on energy conservation, emission reduction and environmental protection are increased day by day. The traditional concrete structure production mode is mostly cast in situ, the working strength is high, the labor is intensive, the working condition is poor, the construction period is long, the energy waste is serious, the material loss is serious, the construction waste is more, the engineering quality is poor, the environmental pollution is serious, and the building service life is seriously inconsistent with the design. Most of the components of the assembly type structure are prefabricated in a factory, so that the construction period can be effectively shortened, resources and energy are saved, the material utilization rate is improved, the construction waste emission is reduced, and the influence of the external environment on the construction progress can be avoided to a great extent.

At present, reinforced concrete laminated slabs are commonly adopted in the floor of the fabricated concrete residential building in China. Compared with prefabricated slabs, the concrete laminated slab has the advantages of improving the integral rigidity and the anti-seismic performance of the structure, being easy to control the quality, convenient and quick to construct, saving templates, being high in industrialization degree and reducing environmental pollution. The concrete composite slab combines the advantages of the two components, can meet the requirement of building industrialization, and is a floor form with great development potential.

According to the specification of item 6.6.3 in the technical Specification for prefabricated concrete structures (JGJ1-2014), the laminated slab can be designed into a separable joint according to a unidirectional plate, and can be designed into an integral joint according to a bidirectional plate; the 6.6.6 specification, the maximum bending moment position should be avoided to two-way superimposed sheet integral seam, and post-cast strip width should not be less than 200mm, and in the practical application, the value is usually taken 200 ~ 400mm to current design, and the construction usually adopts the method of utilizing bottom support body to withstand seam department cast-in-place template. Therefore, the following problems generally exist in the engineering application of the two-way laminated slab:

(1) in order to consider the stress characteristics of the two-way composite slab, in the splitting design of the composite slab, the integral joint of the two-way composite slab is usually required to avoid the maximum bending moment, so that the size of the split composite slab is easily too small, a large number of small plates are broken, the construction efficiency is influenced, and the number of joints is increased;

(2) quality problems such as cracking and the like easily occur at the joint of the laminated slab, and the quality problem risk is increased if the number of the joints caused by the problem (1) is too large;

(3) the integral joint of the two-way laminated slab generally has the width of 200-400 mm, and at least two formwork support frame bodies need to be arranged along the width direction of the joint during construction, so that the space between the frame bodies is small, the operation of workers is difficult, and the channel is narrow; and meanwhile, the influence of the number of the seams caused by the problem (1) can further increase the number of the templates and the number of the frames.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two-way superimposed sheet concrete structure, the integral seam that aims at solving two-way superimposed sheet among the prior art has the technical problem of the efficiency of construction low, seam quantity is many and template volume and support body quantity.

In order to achieve the above object, an embodiment of the present invention provides a bidirectional laminated slab concrete structure, which includes a first laminated slab prefabricated layer, a second laminated slab prefabricated layer, a laminated slab cast-in-situ layer and a flexible anti-cracking structure, wherein an integral seam is formed between the first laminated slab prefabricated layer and the second laminated slab prefabricated layer, a first indent is formed on an end bottom surface of the first laminated slab prefabricated layer adjacent to the second laminated slab prefabricated layer, and a second indent is formed on an end bottom surface of the second laminated slab prefabricated layer adjacent to the first laminated slab prefabricated layer;

the cast-in-place layer of superimposed sheet cover through pouring in first superimposed sheet prefabricated layer the prefabricated layer of second superimposed sheet and concrete in the integral seam forms, the bottom surface on cast-in-place layer of superimposed sheet be formed with respectively with first indent with first kerve and second kerve of second indent intercommunication, the anti structure of splitting of flexibility fill in first indent, the second indent first kerve with in the second kerve.

Optionally, the top and the lateral part of the first prefabricated laminated slab layer are respectively exposed with a first truss reinforcing bar and a first distribution reinforcing bar, the top and the lateral part of the second prefabricated laminated slab layer are respectively exposed with a second truss reinforcing bar and a second distribution reinforcing bar, and the first truss reinforcing bar, the first distribution reinforcing bar, the second truss reinforcing bar and the second distribution reinforcing bar are all embedded in the cast-in-situ laminated slab layer.

Optionally, the width × depth of the first indent, the second indent, the first bottom groove and the second bottom groove are all 50mm × 5 mm.

Optionally, the flexible anti-crack structure comprises an inner anti-crack mortar layer, a middle alkali-resistant mesh fabric layer and an outer anti-crack mortar layer, which are sequentially arranged.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the two-way superimposed sheet concrete structure have one of following technological effect at least: firstly, a supporting frame body of a bottom template at a joint does not need to be erected in construction, so that the construction efficiency is improved; secondly, the construction space is saved, the man passing space and the material transportation space in the construction process are increased, and the construction efficiency is indirectly improved; thirdly, the steel plate support frame for fixing the bottom die at the upper part of the joint is embedded in a laminated slab cast-in-place layer formed in cast-in-place concrete after construction is finished, so that the integral rigidity of the floor slab at the integral joint can be increased, and the steel plate support frame has a great effect on resisting negative bending moment mainly borne by the floor slab; fourthly, the steel plate support frames embedded in the cast-in-place layers of the laminated slabs can increase the bearing capacity of the joints of the floor slabs, so that the bearing capacity of the maximum bending moment of the floor slabs can be met by considering the number of support frames at the integral joints during design, a large number of small-size laminated bottom plates which are generated when the floor slabs are disassembled and need to avoid the maximum bending moment are avoided, the number of the laminated bottom plates and the number of the joints are reduced, and the field construction efficiency is improved; fifthly, the joint of the laminated slab prefabricated layer and the laminated slab cast-in-place layer is filled and treated by adopting a flexible anti-cracking structure, so that the risk of cracks on the joint surface of new and old concrete is reduced, and the engineering quality is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of the method for constructing an integral joint of a bidirectional laminated slab concrete structure according to an embodiment of the present invention when step S100 is performed.

Fig. 2 is a schematic structural diagram illustrating the method for constructing an integral joint of a double-ply concrete structure according to an embodiment of the present invention when step S200 is performed.

Fig. 3 is a schematic structural diagram illustrating the method for constructing an integral joint of a bidirectional laminated slab concrete structure according to an embodiment of the present invention when step S300 is performed.

Fig. 4 is a schematic structural diagram illustrating the integral seam construction method for a bidirectional laminated slab concrete structure according to an embodiment of the present invention when step S400 is performed.

Fig. 5 is a schematic structural diagram illustrating the method for constructing an integral joint of a bidirectional laminated slab concrete structure according to an embodiment of the present invention when step S500 is performed.

Fig. 6 is a schematic structural diagram illustrating the method for constructing an integral joint of a bidirectional laminated slab concrete structure according to an embodiment of the present invention when step S600 is performed.

Fig. 7 is a schematic structural diagram of a steel plate supporting frame used when the method for constructing an integral joint of a double-ply concrete structure according to an embodiment of the present invention performs step S300.

Wherein, in the figures, the respective reference numerals:

10-first laminated slab prefabricated layer 11-first indent 12-first truss reinforcing steel bar

13-first distribution rib 20-second laminated slab prefabricated layer 21-second pressing groove

22-second truss steel bar 23-second distribution steel bar 30-aluminum alloy template

31-stiffener plate 32-first web 33-second web

40-back ridge 50-steel plate support frame 51-support plate

52-first pressing plate 53-second pressing plate 60-split bolt

61-opposite-pull screw rod 62-nut 70-laminated slab cast-in-situ layer

71-first bottom groove 72-second bottom groove 80-flexible anti-cracking structure

100-integral seam 311-second fastening hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In an embodiment of the present invention, as shown in fig. 6, a bidirectional composite concrete structure is provided, which comprises a first composite prefabricated layer 10, a second composite prefabricated layer 20, a composite cast-in-situ layer 70 and a flexible anti-cracking structure 80, wherein an integral seam 100 is formed between the first composite prefabricated layer 10 and the second composite prefabricated layer 20, the first composite prefabricated layer 10 is adjacent to the end bottom surface of the second composite prefabricated layer 20 is provided with a first indent 11, the second composite prefabricated layer 20 is adjacent to the end bottom surface of the first composite prefabricated layer 10 is provided with a second indent 21.

Further, the cast-in-place laminated slab layer 70 is formed by pouring concrete on the first prefabricated laminated slab layer 10, the second prefabricated laminated slab layer 20 and the integral joint 100, a first bottom groove 71 and a second bottom groove 72 which are respectively communicated with the first pressure groove 11 and the second pressure groove 21 are formed on the bottom surface of the cast-in-place laminated slab layer 70, and the flexible anti-cracking structure 80 is filled in the first pressure groove 11, the second pressure groove 21, the first bottom groove 71 and the second bottom groove 72.

As shown in fig. 1 to 7, the bidirectional laminated slab concrete structure provided in this embodiment is processed and formed by the following integral seam construction method for a bidirectional laminated slab concrete structure, and specifically, the integral seam construction method includes the following steps:

s100: hoisting a first laminated slab prefabricated layer 10 and a second laminated slab prefabricated layer 20, wherein an integral joint 100 is formed between the first laminated slab prefabricated layer 10 and the second laminated slab prefabricated layer 20, a first pressing groove 11 is formed in the bottom surface of the end part, adjacent to the second laminated slab prefabricated layer 20, of the first laminated slab prefabricated layer 10, and a second pressing groove 21 is formed in the bottom surface of the end part, adjacent to the first laminated slab prefabricated layer 10, of the second laminated slab prefabricated layer 20; neither the first laminated slab prefabricated layer 10 nor the second laminated slab prefabricated layer 20 is prefabricated;

s200: providing the aluminum alloy template 30, wherein the aluminum alloy template comprises a reinforcing rib plate part 31 and a first connecting plate part 32 and a second connecting plate part 33, the two ends of the reinforcing rib plate part 31 are bent upwards and extend and are parallel to the reinforcing rib plate part 31, the aluminum alloy template 30 is hoisted to the lower part of the integral joint 100, the first connecting plate part 32 and the second connecting plate part 33 respectively extend into and abut against the first pressing groove 11 and the second pressing groove 21, and then a back edge 40 is adopted to cover the surface of the reinforcing rib plate part 31; preferably, the widths of the first butt plate portion 32 and the second butt plate portion 33 are both not 10 mm; further, the aluminum alloy form 30 is not integrally formed; the width of the entire aluminum alloy form 30 is increased by 96mm for the width of the integral joint 100;

s300: providing a steel plate supporting frame 50, wherein the steel plate supporting frame 50 comprises a supporting plate 51 and a first pressing plate 52 and a second pressing plate 53, the two ends of the supporting plate 51 are bent downwards and extend and are parallel to the supporting plate 51, the steel plate supporting frame 50 is hoisted to the position above the integral seam 100, the first pressing plate 52 and the second pressing plate 53 are respectively abutted to the top surface of the first laminated slab prefabricated layer 10 and the top surface of the second laminated slab prefabricated layer 20, and then a plurality of counter bolts 60 sequentially penetrate through the back ridge 40 and the reinforcing rib plate part 31 and are locked with the supporting plate 51;

s400: pouring concrete in the first laminated slab prefabricated layer 10, the second laminated slab prefabricated layer 20 and the integral joint 100 to form a laminated slab cast-in-place layer 70; the laminated slab cast-in-place layer 70 is effectively bonded with the first laminated slab prefabricated layer 10 and the second laminated slab prefabricated layer 20;

s500; after the laminated slab cast-in-place layer 70 reaches the detachable strength, the split bolts 60 are loosened, the back edges 40 and the aluminum alloy template 30 are removed, and the steel plate support frame 50 is arranged in the laminated slab cast-in-place layer 70, so that the strength of the laminated slab cast-in-place layer 70 can be enhanced; a first bottom groove 71 and a second bottom groove 72 which are respectively communicated with the first pressure groove 11 and the second pressure groove 21 are formed on the bottom surface of the laminated slab cast-in-situ layer 70; the first pressing groove 11 is communicated with the first bottom groove 71 to form an elongated groove, and similarly, the second pressing groove 21 is communicated with the second bottom groove 72 to form an elongated groove;

s600: filling flexible anti-crack structures 80 in the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72; the flexible crack resistant structure 80 may bond the laminated slab cast-in-place layer 70 with the first laminated slab precast layer 10 and the second laminated slab precast layer 20.

The embodiment of the utility model provides a two-way superimposed sheet concrete structure has following advantage at least in the manufacturing work progress: firstly, a supporting frame body of a bottom template at a joint does not need to be erected in construction, so that the construction efficiency is improved; secondly, the construction space is saved, the man passing space and the material transportation space in the construction process are increased, and the construction efficiency is indirectly improved; thirdly, after the construction is finished, the steel plate support frame 50 for fixing the bottom die at the upper part of the joint is embedded in the laminated slab cast-in-place layer 70 formed in cast-in-place concrete, so that the integral rigidity of the floor slab at the integral joint 100 can be increased, and the steel plate support frame has a great effect on resisting the negative bending moment mainly borne by the floor slab; fourthly, the steel plate support frames 50 embedded in the laminated slab cast-in-place layer 70 can increase the bearing capacity of the joints of the floor slab, so that the bearing capacity of the maximum bending moment of the floor slab can be met by considering the number of support frames at the integral joints 100 during design, a large number of small-size laminated bottom plates which are generated by avoiding the maximum bending moment when the floor slab is disassembled are avoided, the number of the laminated bottom plates and the number of the joints are reduced, and the field construction efficiency is improved; fifthly, the joint of the laminated slab prefabricated layer and the laminated slab cast-in-place layer 70 is filled and treated by the flexible anti-cracking structure 80, so that the risk of cracks on the joint surface of new and old concrete is reduced, and the engineering quality is improved.

In this embodiment, as shown in fig. 4, the top and the side of the first laminated slab prefabricated layer 10 are respectively exposed with a first truss reinforcement 12 and a first distribution reinforcement 13, the top and the side of the second laminated slab prefabricated layer 20 are respectively exposed with a second truss reinforcement 22 and a second distribution reinforcement 23, and the first truss reinforcement 12, the first distribution reinforcement 13, the second truss reinforcement 22 and the second distribution reinforcement 23 are all embedded in the laminated slab cast-in-place layer 70. Specifically, the connection strength between the laminated slab cast-in-place layer 70 and the first laminated slab prefabricated layer 10 can be enhanced through the first truss reinforcing steel bars 12 and the first distribution ribs 13; similarly, the connection strength between the cast-in-place layer 70 of the laminated slab and the second laminated slab prefabricated layer 20 can be enhanced by the second truss reinforcing bars 22 and the second distribution reinforcing bars 23. In addition, the first distribution rib 13 and the second distribution rib 23 can be bundled together, so that the connection strength between the first laminated slab prefabricated layer 10 and the second laminated slab prefabricated layer 20 can be enhanced under the auxiliary action of the laminated slab cast-in-place layer 70.

In this embodiment, the widths × depths of the first indent 11, the second indent 21, the first bottom groove 71, and the second bottom groove 72 are all 50mm × 5 mm. The width x depth dimension is designed to keep the first indent 11 and the first bottom groove 71 communicated together to form an integral groove structure, and similarly, to keep the second indent 21 and the second bottom groove 72 communicated together to form an integral groove structure; and, a space is provided for the arrangement of the flexible anti-crack structure 80, and the flexible anti-crack structure 80 is filled in the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72, so that cracks are prevented from occurring before the first laminated slab prefabricated layer 10 and the laminated slab cast-in-place layer 70, and cracks are also prevented from occurring before the second laminated slab prefabricated layer 20 and the laminated slab cast-in-place layer 70, thereby ensuring the integrity of the bidirectional laminated slab concrete structure.

In this embodiment, in the step S600, before the flexible anti-crack structure 80 is filled, the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72 are cleaned by impurities, and then the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72 which are cleaned by the impurities are wet by spraying water. In this step, by cleaning up impurities on the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72, grease, dust, paint, cement slurry and other unfavorable adhesion can be effectively removed, so that when the flexible anti-crack structure 80 is filled and arranged in the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72, the flexible anti-crack structure can be effectively adhered to the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72, and an integral structure is effectively formed.

In this embodiment, in the step S600, the flexible anti-crack structure 80 includes an inner anti-crack mortar layer, a middle alkali-resistant mesh fabric layer, and an outer anti-crack mortar layer, which are sequentially disposed. Specifically, after the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72 are sprayed with water to be wetted, the inner walls of the first indent 11, the second indent 21, the first bottom groove 71 and the second bottom groove 72 are smeared with anti-crack mortar to form an inner anti-crack mortar layer, then an alkali-resistant mesh fabric is pressed on the inner anti-crack mortar layer to form a middle alkali-resistant mesh fabric layer, and finally the anti-crack mortar is smeared to form an outer anti-crack mortar layer outside the middle alkali-resistant mesh fabric layer, that is, the alkali-resistant mesh fabric is arranged in the anti-crack mortar, so that the construction of the integral joint 100 of the two-way composite slab is completed, and the two-way composite slab concrete structure is formed.

In this embodiment, as shown in fig. 3, in the step S300, the counter bolt 60 includes a counter screw 61 and a nut 62, the nut 62 is welded on the support plate 51, the back edge 40 and the reinforcing rib plate 31 are respectively provided with a first fixing hole and a second fixing hole 311, the positions of which are both corresponding to the nut 62, and the counter screw 61 passes through the first fixing hole and the second fixing hole 311 in sequence and then is locked with the nut 62. Specifically, the nut 62 is directly welded to the support plate 51, and the tie screw 61 is screwed and locked to the nut 62 welded to the support plate 51 after passing through the first fixing hole 311 and the second fixing hole 311, and the tie screw 61 tightens the support plate 51 and the back rib 40 and the reinforcing rib plate 31, so that the steel plate support 50 presses the top surface of the first laminated slab precast layer 10 and the top surface of the second laminated slab precast layer 20 and the aluminum alloy formwork 30 presses the bottom surface of the first laminated slab precast layer 10 and the bottom surface of the second laminated slab precast layer 20.

Further, according to actual conditions, the split bolts 60 are provided with a plurality of, and the split steel plate support frame 50 and the aluminum alloy template 30 are combined through the split bolts 60, so that the structural consistency of all positions is good.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (4)

1. A two-way superimposed sheet concrete structure which characterized in that: the laminated slab comprises a first laminated slab prefabricated layer, a second laminated slab prefabricated layer, a laminated slab cast-in-place layer and a flexible anti-cracking structure, wherein an integral seam is formed between the first laminated slab prefabricated layer and the second laminated slab prefabricated layer, a first pressing groove is formed in the bottom surface of the end part, adjacent to the second laminated slab prefabricated layer, of the first laminated slab prefabricated layer, and a second pressing groove is formed in the bottom surface of the end part, adjacent to the first laminated slab prefabricated layer, of the second laminated slab prefabricated layer;

the cast-in-place layer of superimposed sheet cover through pouring in first superimposed sheet prefabricated layer the prefabricated layer of second superimposed sheet and concrete in the integral seam forms, the bottom surface on cast-in-place layer of superimposed sheet be formed with respectively with first indent with first kerve and second kerve of second indent intercommunication, the anti structure of splitting of flexibility fill in first indent, the second indent first kerve with in the second kerve.

2. The bidirectional laminated slab concrete structure according to claim 1, characterized in that: the top and the lateral part of first superimposed sheet prefabricated layer are exposed respectively and are had first truss reinforcing bar and first distribution muscle, the top and the lateral part of second superimposed sheet prefabricated layer are exposed respectively and are had second truss reinforcing bar and second distribution muscle, first truss reinforcing bar, first distribution muscle second truss reinforcing bar with the second distribution muscle all bury underground in the superimposed sheet cast-in-place layer.

3. The bidirectional laminated slab concrete structure according to claim 1, characterized in that: the width multiplied by the depth of the first pressure groove, the second pressure groove, the first bottom groove and the second bottom groove are all 50mm multiplied by 5 mm.

4. The bidirectional laminated slab concrete structure according to any one of claims 1 to 3, characterized in that: the flexible anti-cracking structure comprises an inner anti-cracking mortar layer, a middle alkali-resistant mesh fabric layer and an outer anti-cracking mortar layer which are sequentially arranged.

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