CN215802549U - Prefabricated heat preservation sound insulation floor structure convenient to equipment - Google Patents

Abstract

The utility model relates to a prefabricated heat-insulation sound-insulation floor structure convenient to assemble, which comprises a first floor, heat-insulation sound-insulation boards, a second floor, a plurality of first connecting grooves, a plurality of first connecting plates, a limiting rod, a plurality of first connecting elements and a plurality of second connecting elements, wherein the first connecting grooves are formed in the first floor; the first end of the heat-insulation and sound-insulation board is arranged in a first mounting groove of the first floor slab, and the second end of the heat-insulation and sound-insulation board is positioned in a second mounting groove of the second floor slab; the first connecting grooves are arranged at the first end of the first floor slab at intervals; the first connecting plates are arranged at the first end of the second floor slab at intervals; the limiting rods penetrate through the side walls of the corresponding first connecting grooves and are positioned in the corresponding first connecting plates; the prefabricated heat-insulation sound-insulation floor structure is simple and reasonable in structure and convenient to assemble, and solves the problems that the existing floor structure does not have heat-insulation capacity and sound-insulation capacity and certain construction conditions are required for forming the floor structure by cast-in-place.

Description

Prefabricated heat preservation sound insulation floor structure convenient to equipment

Technical Field

The utility model relates to the technical field of constructional engineering, in particular to a prefabricated heat-preservation sound-insulation floor slab structure convenient to assemble.

Background

Floor structures are basic structures or components in building construction and various engineering structures, are commonly used as roofs, floor systems, platforms, walls, retaining walls, foundations, terraces, pavements, pools and the like, have extremely wide application range, are mostly cast in situ in the prior art, and are usually cast in concrete after templates are supported and reinforcing steel bars are bound.

Most of the existing floor structures are only one layer of concrete floor and do not have heat preservation capability and sound insulation capability, so that a heat preservation layer and a sound insulation layer need to be constructed again under the condition that a customer needs to enhance the heat preservation capability and the sound insulation capability, and the construction is complex and the cost is high; in addition, the floor slab structure is formed by casting in situ, certain requirements are met on site construction conditions, and the floor slab structure is difficult to form by casting in situ under the condition of insufficient construction conditions.

At present, an effective solution is not provided aiming at the problems that the existing floor slab structure does not have heat preservation capability and sound insulation capability and certain construction conditions are required for forming the floor slab structure by cast-in-place.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a prefabricated heat-insulation sound-insulation floor structure convenient to assemble, aiming at overcoming the defects in the prior art, and at least solving the problems that the existing floor structure does not have heat-insulation and sound-insulation capabilities and certain construction conditions are required for forming the floor structure by cast-in-place.

In order to achieve the above object, the present invention provides a prefabricated heat-insulating and sound-insulating floor slab structure convenient for assembly, comprising:

the first floor slab is provided with a first mounting groove at a first end;

the first end of the heat-insulation sound-insulation board is arranged in the first mounting groove, and the second end of the heat-insulation sound-insulation board is positioned outside the first floor;

a second mounting groove is formed in the first end of the second floor slab, and the second mounting groove is buckled with the second end of the heat and sound insulation plate;

the first connecting grooves are arranged at the first end of the first floor slab at intervals, a first limiting groove is formed in the side wall of each first connecting groove, and each first limiting groove is communicated with the outside of the first floor slab;

the first connecting plates are arranged at the first end of the second floor at intervals, matched with the corresponding first connecting grooves and arranged correspondingly, a second limiting groove is formed in the side wall of each first connecting plate, and each second limiting groove is arranged corresponding to the corresponding first limiting groove;

the limiting rods penetrate through the corresponding first limiting grooves and are positioned in the corresponding second limiting grooves;

the first ends of the first connecting elements are embedded in the first floor slab at intervals, and the second ends of the first connecting elements are positioned outside the second ends of the first floor slab;

and the first ends of the second connecting elements are embedded in the second floor slab at intervals, the second ends of the second connecting elements are positioned outside the second ends of the second floor slab, and the second ends of the second connecting elements are matched with the corresponding second ends of the first connecting elements and are correspondingly arranged.

Further, in the prefabricated heat-insulating and sound-insulating floor slab structure, the first floor slab includes:

a first sealing groove provided at a first end of the first floor slab and arranged around the first mounting groove;

the second floor includes:

and the sealing ring is arranged at the first end of the second floor slab, surrounds the second mounting groove, and corresponds to and is matched with the first sealing groove.

Further, in the prefabricated heat-insulating and sound-insulating floor slab structure, the second floor slab includes:

and the second sealing groove is formed in the side wall of the sealing ring along the circumferential direction of the sealing ring, and concrete is poured in the second sealing groove to be in sealing connection with the first sealing groove.

Further, in the prefabricated heat-insulating and sound-insulating floor slab structure, the first floor slab further includes:

and the grouting grooves are arranged on the side wall of the first floor slab at intervals and are communicated with the second sealing groove.

Further, in the prefabricated heat-insulating and sound-insulating floor slab structure, the first floor slab further includes:

and the plurality of limiting strips are arranged on the side wall of the first mounting groove at intervals and are embedded into the heat-insulating and sound-insulating plate.

Further, in the prefabricated thermal and acoustical insulation floor structure, the first connecting member includes:

and the second connecting groove is arranged at the second end of the first connecting element and matched with the second end of the second connecting element.

Further, in the prefabricated thermal and acoustical insulation floor structure, the second connecting member includes:

the third mounting groove is formed in the second end of the second connecting element;

and the limiting assembly is arranged in the third mounting groove and used for limiting the second connecting element in the second connecting groove.

Further, in the prefabricated heat preservation and sound insulation floor structure, the limiting assembly comprises:

the elastic metal sheet is obliquely arranged in the third mounting groove;

and the limiting block is arranged at one end, far away from the third mounting groove, of the elastic metal sheet.

Further, in the prefabricated thermal and acoustical insulation floor structure, the first connecting member includes:

and the third limiting groove is formed in the side wall of the second connecting groove, corresponds to the limiting component and is matched with the limiting component.

Further, in the prefabricated heat-insulating and sound-insulating floor slab structure, the first floor slab includes:

the third connecting groove is formed in the second end of the first floor slab;

the second floor includes:

and the second connecting plate is arranged at the second end of the second floor slab, corresponds to the third connecting groove and is matched with the third connecting groove.

By adopting the technical scheme, compared with the prior art, the utility model has the following technical effects:

(1) according to the prefabricated heat-preservation sound-insulation floor structure convenient to assemble, the heat-preservation sound-insulation boards are arranged in the first mounting groove and the second mounting groove, so that the heat-preservation and sound-insulation capabilities of the first floor and the second floor are enhanced, the prefabricated heat-preservation sound-insulation floor structure is convenient to assemble by construction personnel, and the problems that certain construction conditions are needed for forming the floor structure by in-situ pouring and the existing prefabricated heat-preservation sound-insulation floor structure is inconvenient to assemble are solved;

(2) the first connecting plates are inserted into the corresponding first connecting grooves, and the limiting rods sequentially penetrate through the first limiting grooves and the second limiting grooves, so that the firmness of connection between the first floor slab and the second floor slab is enhanced;

(3) the strength of the first floor and the second floor can be enhanced by burying a plurality of first connecting elements in the first floor and burying a plurality of second connecting elements in the second floor, and a plurality of prefabricated heat-preservation sound-insulation floor structures can be assembled and connected with each other through a plurality of first connecting elements and a plurality of second connecting elements, so that the prefabricated heat-preservation sound-insulation floor structures form a whole;

(4) the prefabricated heat-insulation sound-insulation floor structure is simple and reasonable in structure and convenient to assemble, solves the problems that the existing floor structure does not have heat-insulation capacity and sound-insulation capacity and certain construction conditions are needed for forming the floor structure by in-situ pouring, and has good practical value and popularization and application values.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic structural view of a first floor slab of the present invention;

FIG. 4 is a schematic structural view of a second floor slab of the present invention;

FIG. 5 is a cross-sectional view of the present invention;

FIG. 6 is a schematic view of the structure of portion A in FIG. 5;

FIG. 7 is a cross-sectional view of a first connecting element of the present invention;

FIG. 8 is a schematic view of the structure of the portion B in FIG. 4;

wherein the reference symbols are:

100. a first floor slab; 110. a first mounting groove; 120. a first seal groove; 130. grouting grooves; 140. a limiting strip; 150. a third connecting groove;

200. a heat and sound insulation plate;

300. a second floor slab; 310. a second mounting groove; 320. a seal ring; 330. a second seal groove; 340. a second connecting plate;

400. a first connecting groove; 410. a first limit groove;

500. a first connecting plate; 510. a second limit groove;

600. a limiting rod;

700. a first connecting element; 710. a second connecting groove; 720. a third limiting groove;

800. a second connecting element; 810. a third mounting groove; 820. a limiting component; 821. a resilient metal sheet; 822. and a limiting block.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and simplicity in description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 2, the prefabricated heat and sound insulation floor structure convenient to assemble according to the present invention includes a first floor 100, a heat and sound insulation board 200, a second floor 300, a plurality of first connecting grooves 400, a plurality of first connecting plates 500, a limiting rod 600, a plurality of first connecting elements 700, and a plurality of second connecting elements 800.

As shown in fig. 3, a first installation groove 110 is formed at a first end of the first floor 100, and the first floor 100 is used for forming a prefabricated thermal insulation and sound insulation floor structure.

In some of these embodiments, the first floor 100 may be cast of concrete.

The first end of heat preservation acoustic celotex board 200 is installed in first mounting groove 110, and the second end of heat preservation acoustic celotex board 200 is located the outside of first floor 100, and heat preservation acoustic celotex board 200 is used for strengthening prefabricated heat preservation acoustic celotex floor's heat preservation ability and noise insulation ability to solve the poor problem of poor heat preservation ability and noise insulation ability of current floor structure.

The heat and sound insulation board 200 includes, but is not limited to, a rock wool heat insulation board and a glass wool board.

As shown in fig. 4, a second installation groove 310 is formed at a first end of the second floor 300, a second end of the thermal insulation and sound insulation board 200 is buckled in the second installation groove 310, and the second floor 300 is used for covering and wrapping the second end of the thermal insulation and sound insulation board 200, so that the thermal insulation and sound insulation board 200 is prevented from being exposed to the outside and is convenient to assemble and transport.

As shown in fig. 5 to 6, a plurality of first connecting grooves 400 are spaced apart at a first end of the first floor 100, a first limiting groove 410 is disposed on a sidewall of each first connecting groove 400, each first limiting groove 410 is communicated with an exterior of the first floor 100, and the first connecting grooves 400 are used for connecting the first floor 100 and the second floor 300.

The longitudinal section of the first connecting groove 400 may be circular or polygonal.

The plurality of first connecting plates 500 are arranged at the first end of the second floor slab 300 at intervals and are matched with the corresponding first connecting grooves 400 and are correspondingly arranged, the second limiting grooves 510 are formed in the side walls of the first connecting plates 500, the second limiting grooves 510 are arranged corresponding to the first limiting grooves 410, and the plurality of first connecting plates 500 are used for being matched with the plurality of first connecting grooves 400 to connect the first floor slab 100 and the second floor slab 300 together.

Specifically, each first connecting plate 500 is inserted into the corresponding first connecting groove 400, and the first limiting groove 410 and the second limiting groove 510 correspond to each other and communicate with each other up and down when the first connecting plate 500 is inserted into the first connecting groove 400.

The limiting rods 600 penetrate through the corresponding first limiting grooves 410 and are located in the corresponding second limiting grooves 510, and the limiting rods 600 are used for limiting the first connecting plate 500 in the first connecting groove 400, so that the first connecting plate 500 is prevented from being separated from the first connecting groove 400.

Specifically, each of the position-limiting rods 600 passes through a corresponding first position-limiting groove 410 and is located in a corresponding second position-limiting groove 510.

Preferably, the stopper 600 may be cast of concrete.

The first ends of the first connecting elements 700 are embedded in the first floor 100 at intervals, the second ends of the first connecting elements 700 are located outside the second ends of the first floor 100, and the first connecting elements 700 are used for connecting the prefabricated heat-preservation and sound-insulation floor structures.

Preferably, the first connection member 700 is made of a metal material, such as a steel bar.

The first ends of the second connecting elements 800 are embedded in the second floor 300 at intervals, the second ends of the second connecting elements 800 are located outside the second ends of the second floor 300, the second ends of the second connecting elements 800 are matched with and arranged corresponding to the second ends of the corresponding first connecting elements 700, and the second connecting elements 800 are used for matching the first connecting elements 700 to enable the prefabricated heat-preservation and sound-insulation floors to be connected with one another.

Specifically, under the condition that two prefabricated heat preservation and sound insulation floor slabs need to be connected, one prefabricated heat preservation and sound insulation floor slab correspondingly connects the second connecting element 800 with the first connecting element 700 of the other prefabricated heat preservation and sound insulation floor slab, so that the two prefabricated heat preservation and sound insulation floor slabs are integrated, and the connection firmness of the two prefabricated heat preservation and sound insulation floor slabs is enhanced.

As shown in fig. 3, the first floor panel 100 includes a first sealing groove 120, the first sealing groove 120 is disposed at a first end of the first floor panel 100 and is disposed around the first mounting groove 110, and the first sealing groove 120 is used for sealing a joint between the first floor panel 100 and the second floor panel 300 and enhancing the firmness of the joint between the first floor panel 100 and the second floor panel 300.

The first seal groove 120 has a circular longitudinal cross section.

As shown in fig. 4, the second floor 300 includes a sealing ring 320, the sealing ring 320 is disposed at a first end of the second floor 300, and is disposed around the second installation groove 310, and is corresponding to and matched with the first sealing groove 120, and the sealing ring 320 is used for being matched with the first sealing groove 120 to seal a connection between the first floor 100 and the second floor 300.

Wherein the sealing ring 320 may be cast of concrete.

Further, in order to seal the joint of the first floor 100 and the second floor 300, as shown in fig. 4, the second floor 300 further includes a second sealing groove 330, the second sealing groove 330 is opened on the sidewall of the sealing ring 320 along the circumferential direction of the sealing ring 320, and concrete is poured into the second sealing groove 330 to be in sealing connection with the first sealing groove 120.

Specifically, under the condition that the sealing ring 320 is inserted into the first sealing groove 120, a constructor may pour concrete into the second sealing groove 330 first to connect the concrete with the sidewall of the first sealing groove 120, so as to seal the joint between the sealing ring 320 and the first sealing groove 120, and prevent water from entering the first mounting groove 110 or the second mounting groove 310 from the joint between the sealing ring 320 and the first sealing groove 120 to damage the thermal insulation and sound insulation board 200.

Further, in order to facilitate pouring concrete into the second sealing groove 330 and enhance the connection firmness between the concrete and the first sealing groove 120, as shown in fig. 3, the first floor 100 further includes a plurality of grouting grooves 130, and the grouting grooves 130 are disposed on the sidewall of the first floor 100 at intervals and are all communicated with the second sealing groove 330.

Specifically, in the case that the sealing ring 320 is inserted into the first sealing groove 120, a constructor may pour concrete into the second sealing groove 330 through the plurality of grouting grooves 130, so that the concrete is fixedly connected to the sidewall of the first sealing groove 120.

Further, in order to prevent the heat and sound insulation board 200 from moving in the first installation groove 110 and the second installation groove 310, the first floor board 100 further includes a plurality of limiting strips 140, and the plurality of limiting strips 140 are disposed on the sidewall of the first installation groove 110 at intervals and embedded in the heat and sound insulation board 200 to limit the heat and sound insulation board 200.

Specifically, the side wall of the thermal insulation and sound insulation board 200 is provided with a plurality of slots, and the slots are arranged corresponding to and matching with the corresponding limiting strips 140.

As shown in fig. 7, the first connection member 700 includes a second connection groove 710, and the second connection groove 710 is opened at a second end of the first connection member 700 and is engaged with a second end of the second connection member 800.

Specifically, the second coupling element 800 can be inserted into the second coupling groove 710 to enhance the firmness of the coupling of the second floor panel 300 with the first floor panel 100.

The longitudinal section of the second connecting groove 710 may be circular or polygonal.

Further, in order to enhance the firmness of the connection between the second connection member 800 and the first connection member 700, as shown in fig. 8, the second connection member 800 includes a third mounting groove 810 and a stopper assembly 820.

The third mounting groove 810 is opened at the second end of the second connection member 800; the position-limiting component 820 is disposed in the third mounting groove 810 and is used for limiting the second connecting element 800 in the second connecting groove 710.

Wherein the third mounting groove 810 is used for mounting the limiting component 820, and the limiting component 820 is used for enhancing the firmness of the connection between the second connection element 800 and the first connection element 700.

Further, the stopper assembly 820 includes an elastic metal sheet 821 and a stopper 822.

The elastic metal piece 821 is obliquely arranged in the third mounting groove 810; the limiting block 822 is disposed at an end of the elastic metal piece 821 away from the third mounting groove 810.

The elastic metal sheet 821 is used to jack up the limiting block 822 upwards, so that when the limiting block 822 enters the second connection groove 710, friction between the limiting block 822 and the second connection groove 710 is increased, and the second connection element 800 is prevented from easily sliding out of the first connection element 700.

The limiting block 822 may be made of metal, such as steel.

Further, in order to enhance the connection firmness of the second connection element 800 and the first connection element 700, the first connection element 700 includes a third limiting groove 720, and the third limiting groove 720 is opened on the sidewall of the second connection groove 710, and corresponds to and is disposed in cooperation with the limiting component 820.

The third positioning groove 720 is matched with the positioning block 822 and is arranged correspondingly.

Specifically, when the second connection element 800 enters the second connection groove 710, the elastic metal piece 821 and the stopper 822 enter the second connection groove 710 together, and the elastic metal piece 821 and the stopper 822 are pressed into the third mounting groove 810 by the side wall of the second connection groove 710, and when the stopper 822 moves to correspond to the third stopper groove 720, the third stopper groove 720 can enter the third stopper groove 720 by the elastic force of the elastic metal piece 821 to fix the second connection element 800 in the second connection groove 710.

Further, in order to enhance the firmness of the connection between the prefabricated thermal insulation and soundproof floors, as shown in fig. 1, the first floor 100 includes a third connection groove 150.

The third connecting groove 150 is opened at the second end of the first floor 100, and is used for fixedly connecting the two prefabricated heat-preservation and sound-insulation floors.

The second floor 300 includes a second connecting plate 340.

Second connecting plate 340 sets up in the second end of second floor 300 to corresponding and the cooperation setting with third spread groove 150, second connecting plate 340 is used for cooperating third spread groove 150 to make two prefabricated heat preservation noise floor can fix and sealing connection, avoids the junction of two adjacent prefabricated heat preservation noise floor to produce the crack.

The assembling method of the prefabricated heat and sound insulation floor of the present invention comprises the steps of firstly installing the heat and sound insulation board 200 into the first installation groove 110 of the first floor board 100, then buckling the second floor board 300 on the heat and sound insulation board 200 so that the heat and sound insulation board 200 is positioned in the first installation groove 110 and the second installation groove 310, inserting the first connection board 500 into the corresponding first connection groove 400, then inserting the limiting rod 600 into the first limiting groove 410 and the second limiting groove 510 to form the prefabricated heat and sound insulation floor, and then inserting the second connection element 800 on one prefabricated heat and sound insulation floor into the first connection element 700 on the other prefabricated heat and sound insulation floor to connect the two adjacent prefabricated heat and sound insulation floors.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a prefabricated heat preservation sound insulation floor structure convenient to equipment which characterized in that includes:

the first floor slab is provided with a first mounting groove at a first end;

the first end of the heat-insulation sound-insulation board is arranged in the first mounting groove, and the second end of the heat-insulation sound-insulation board is positioned outside the first floor;

a second mounting groove is formed in the first end of the second floor slab, and the second mounting groove is buckled with the second end of the heat and sound insulation plate;

the first connecting grooves are arranged at the first end of the first floor slab at intervals, a first limiting groove is formed in the side wall of each first connecting groove, and each first limiting groove is communicated with the outside of the first floor slab;

the first connecting plates are arranged at the first end of the second floor at intervals, matched with the corresponding first connecting grooves and arranged correspondingly, a second limiting groove is formed in the side wall of each first connecting plate, and each second limiting groove is arranged corresponding to the corresponding first limiting groove;

the limiting rods penetrate through the corresponding first limiting grooves and are positioned in the corresponding second limiting grooves;

the first ends of the first connecting elements are embedded in the first floor slab at intervals, and the second ends of the first connecting elements are positioned outside the second ends of the first floor slab;

and the first ends of the second connecting elements are embedded in the second floor slab at intervals, the second ends of the second connecting elements are positioned outside the second ends of the second floor slab, and the second ends of the second connecting elements are matched with the corresponding second ends of the first connecting elements and are correspondingly arranged.

2. The prefabricated thermal and acoustical insulation floor structure of claim 1, wherein said first floor comprises:

a first sealing groove provided at a first end of the first floor slab and arranged around the first mounting groove;

the second floor includes:

and the sealing ring is arranged at the first end of the second floor slab, surrounds the second mounting groove, and corresponds to and is matched with the first sealing groove.

3. The prefabricated thermal and acoustical insulation floor structure of claim 2, wherein said second floor comprises:

and the second sealing groove is formed in the side wall of the sealing ring along the circumferential direction of the sealing ring, and concrete is poured in the second sealing groove to be in sealing connection with the first sealing groove.

4. The prefabricated thermal and acoustical insulation floor structure of claim 3, wherein said first floor further comprises:

and the grouting grooves are arranged on the side wall of the first floor slab at intervals and are communicated with the second sealing groove.

5. The prefabricated thermal and acoustical insulation floor structure of claim 1, wherein said first floor further comprises:

and the plurality of limiting strips are arranged on the side wall of the first mounting groove at intervals and are embedded into the heat-insulating and sound-insulating plate.

6. The prefabricated thermal and acoustical floor structure of claim 1, wherein said first connecting element comprises:

and the second connecting groove is arranged at the second end of the first connecting element and matched with the second end of the second connecting element.

7. The prefabricated thermal and acoustical floor structure of claim 6, wherein said second connecting member comprises:

the third mounting groove is formed in the second end of the second connecting element;

and the limiting assembly is arranged in the third mounting groove and used for limiting the second connecting element in the second connecting groove.

8. The prefabricated thermal and acoustical floor structure of claim 7, wherein said spacing assembly comprises:

the elastic metal sheet is obliquely arranged in the third mounting groove;

and the limiting block is arranged at one end, far away from the third mounting groove, of the elastic metal sheet.

9. The prefabricated thermal and acoustical floor structure of claim 7, wherein said first connecting element comprises:

and the third limiting groove is formed in the side wall of the second connecting groove, corresponds to the limiting component and is matched with the limiting component.

10. The prefabricated thermal and acoustical insulation floor structure of claim 1, wherein said first floor comprises:

the third connecting groove is formed in the second end of the first floor slab;

the second floor includes:

and the second connecting plate is arranged at the second end of the second floor slab, corresponds to the third connecting groove and is matched with the third connecting groove.

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