Laminated slab for installing vertical pipe and construction method of laminated slab and vertical pipe

Abstract

The invention belongs to the technical field of fabricated buildings, and discloses a laminated slab for mounting a vertical pipe and a construction method of the laminated slab and the vertical pipe. The laminated slab for mounting the vertical pipe comprises a laminated slab main body and a reserved mold, the reserved mold can be detachably arranged on the laminated slab main body, so that the laminated slab main body formed by pouring is provided with an avoiding groove, the reserved mold is provided with an avoiding hole, and the avoiding hole is used for avoiding a transverse reinforcing rib in the laminated slab main body. According to the laminated slab for installing the vertical pipe, in the subsequent construction process, only the laminated slab body needs to be positioned and installed, holing operation does not need to be conducted on the laminated slab body, the construction steps are reduced, the construction efficiency is improved, and the construction cost is reduced. According to the construction method of the laminated slab and the vertical pipe, the situation that the construction period is delayed due to the fact that the size of the laminated slab is wrong or the installation positions of the receding groove and the vertical pipe deviate during construction can be avoided, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated building, and in particular to a composite slab for installing a vertical pipe and a composite slab and vertical pipe construction method. BACKGROUND

[0002] In the field of prefabricated building construction, the composite slab can improve construction efficiency and engineering quality. The composite slab is produced by standardization prefabrication in the factory, which can precisely control the component size accuracy and concrete strength, and reduce the on-site construction error. When installed on site, only support erection and composite layer pouring need to be completed, which reduces the construction period of the traditional cast-in-place process, significantly reduces the amount of on-site wet work, and reduces labor input and material waste. In addition, the composite slab has high strength, which can ensure the stability of the main structure of the building, and is widely used in the floor construction of residential buildings.

[0003] However, in the area where the vertical pipe needs to be set, such as the residential bathroom, the composite slab needs to be drilled on the composite slab to meet the pipe installation requirements when the composite slab is constructed. After the composite slab is installed, it needs to be drilled again, which increases the construction process and cost, and the construction efficiency is low. In addition, the process of drilling the vertical pipe hole will cut off the internal steel bars of the composite slab, causing the steel bars to loosen, resulting in a decrease in the bearing capacity of the composite slab and a safety hazard. SUMMARY

[0004] The purpose of the present application is to provide a composite slab for installing a vertical pipe and a composite slab and vertical pipe construction method to improve construction efficiency.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A composite slab for installing a vertical pipe, comprising:

[0007] A composite slab body, which is cast and internally provided with a transverse reinforcing bar;

[0008] A reserved mold, which is a closed frame structure, and the height of the reserved mold is not less than the thickness of the composite slab body. The reserved mold is detachably connected to the composite slab body. The reserved mold is provided with a plurality of avoiding openings. The avoiding openings are arranged at intervals along the length direction of the reserved mold. Along the width direction of the reserved mold, the avoiding openings on both sides of the reserved mold are aligned one by one. The avoiding openings on both sides of the reserved mold extend from one side of the reserved mold to the inside of the reserved mold. The avoiding openings are used for passing the transverse reinforcing bar. The composite slab body and the reserved mold are separated after casting, so that the composite slab body has an avoiding groove for avoiding the vertical pipe.

[0009] The above-mentioned composite slab for installing a vertical pipe, wherein the width of each avoiding opening is the same, and the width of each avoiding opening is greater than the diameter of the transverse reinforcing bar by 3-8 mm.

[0010] The composite slab for installing riser pipe, wherein the depth of each of the avoidance slots is not less than the depth of the embedded transverse reinforcement in the composite slab body.

[0011] The composite slab for installing riser pipe, wherein the depth of each of the avoidance slots is not less than the depth of the embedded transverse reinforcement in the composite slab body.

[0012] A composite slab and riser pipe construction method using the composite slab for installing riser pipe, comprising the following steps:

[0013] S1, setting the size of the composite slab body, the size of the avoidance slot, the position size of the avoidance slot relative to the composite slab body, and the size of the reserved mold according to the construction requirements, and drawing design drawings;

[0014] S2, processing the composite slab body according to the design drawings, fixing the pouring mold and the reserved mold, embedding the transverse reinforcement and making the transverse reinforcement pass through the avoidance slot of the reserved mold, pouring the concrete, and separating the pouring mold and the reserved mold to obtain the composite slab body after the concrete is shaped;

[0015] S3, hoisting the composite slab body to the installation position, positioning the riser pipe after the composite slab body is fixed, and installing the riser pipe and adjusting the transverse reinforcement interfering with the riser pipe.

[0016] The composite slab and riser pipe construction method, wherein in step S2, after pouring the concrete, a steel mesh is laid on the top surface of the concrete, and the steel mesh is removed with the pouring mold after the concrete is shaped to form a rough surface concrete.

[0017] The composite slab and riser pipe construction method, wherein after step S2, the transverse reinforcement in the avoidance slot is cut off, and the transverse reinforcement on both sides of the avoidance slot respectively extends into the avoidance slot by 120-180mm.

[0018] The composite slab and riser pipe construction method, wherein in step S3, a support assembly is fixed on the composite slab body on both sides of the avoidance slot, and a connecting plate is fixed on the top of the support assembly, and the riser pipe passes through the connecting plate and the avoidance slot and is fixed by a fixing assembly.

[0019] The composite slab and riser pipe construction method, wherein after step S3, a baffle is detachably connected to the composite slab body below the avoidance slot, the avoidance slot is poured to fix the riser pipe and the composite slab body, and then the support assembly and the fixing assembly are removed to install the remaining riser pipe.

[0020] The composite slab and riser pipe construction method, wherein after all the riser pipes are installed and fixed, a concrete layer is poured on the top surface of the composite slab body, and the concrete layer is higher than the top surface of the riser pipe.

[0021] The beneficial effects of the present application are as follows:

[0022] The laminated slab for installing the riser provided by the present application is assembled with the reserved mold during pouring, the reserved mold is provided with a avoiding opening, and the avoiding opening extends from one side of the reserved mold to the inside of the reserved mold, so that the transverse reinforcing rib can be overlapped in the avoiding opening, the laminated slab body and the reserved mold can be separated after the mold is divided, the difficulty of mold division is reduced, and the mold division efficiency is improved. At the same time, the laminated slab body after mold division has an avoiding groove, and in the subsequent construction process, only the laminated slab body needs to be positioned and installed, without the need of hole opening operation on the laminated slab body, thereby reducing the construction steps, improving the construction efficiency and reducing the construction cost.

[0023] The construction method of the laminated slab and the riser provided by the present application draws setting drawings according to the size of the house before processing the laminated slab, determines the size of the laminated slab body, the size of the avoiding groove, the position of the avoiding groove relative to the laminated slab body and the size of the reserved mold, and the laminated slab body poured according to the drawings can meet the construction requirements, avoids the delay of construction period caused by the size error of the laminated slab or the deviation of the installation position of the avoiding groove and the riser during construction, and improves the construction efficiency. At the same time, when the riser is installed, the transverse reinforcing rib interfering with the riser is adjusted, the riser can support the transverse reinforcing rib, thereby improving the overall strength of the transverse reinforcing rib, reducing the safety hidden danger and improving the safety. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the first structure schematic view of the laminated slab and the riser provided by the present application;

[0025] Figure 2 is the second structure schematic view of the laminated slab and the riser provided by the present application;

[0026] Figure 3 is the third structure schematic view of the laminated slab and the riser provided by the present application;

[0027] Figure 4 is the fourth structure schematic view of the laminated slab and the riser provided by the present application;

[0028] Figure 5 is the structure schematic view of the laminated slab and the concrete layer provided by the present application;

[0029] Figure 6 is the structure schematic view of the reserved mold and the transverse reinforcing rib provided by the present application;

[0030] Figure 7 is the structure schematic view of the reserved mold in the first view angle provided by the present application;

[0031] Figure 8 This is a schematic diagram of the reserved mold provided in an embodiment of the present invention from a second perspective.

[0032] In the picture:

[0033] 1. Composite slab body; 11. Clearance groove;

[0034] 2. Transverse reinforcing ribs;

[0035] 3. Reserved mold space; 31. Clearance opening;

[0036] 4. Reinforce with steel bars;

[0037] 5. Support components; 51. Stirrups; 52. Cement blocks; 53. Timber blocks; 54. Bottom timber; 55. Top timber;

[0038] 6. Fixing components; 61. Tie rods; 62. U-shaped clips;

[0039] 100. Riser;

[0040] 200. Concrete layer;

[0041] 300. Supporting wooden planks. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] The composite slab for installing risers and the construction method of the composite slab and risers provided by the present invention eliminate the need to open holes during construction, reduce construction steps, and improve construction efficiency.

[0047] like Figures 1-8 As shown, the composite slab used for installing the riser includes a composite slab body 1 and a reserved mold 3. The composite slab body 1 is cast and formed and has transverse reinforcing ribs 2 inside. The reserved mold 3 is a closed frame structure, and the height of the reserved mold 3 is not less than the thickness of the composite slab body 1. The reserved mold 3 is detachably connected to the composite slab body 1. The reserved mold 3 has multiple clearance openings 31, which are spaced apart along the length direction of the reserved mold 3. Along the width direction of the reserved mold 3, the clearance openings 31 on both sides of the reserved mold 3 are aligned one by one. The clearance openings 31 on both sides of the reserved mold 3 extend from one side of the reserved mold 3 into the reserved mold 3. The clearance openings 31 are used to pass through the transverse reinforcing ribs 2. After the composite slab body 1 and the reserved mold 3 are cast, they are separated, so that the composite slab body 1 has a clearance groove 11, which is used to avoid the riser 100.

[0048] The composite slab for installing risers provided by this invention, during casting, the composite slab body 1 and the reserved mold 3 are assembled together. The reserved mold 3 has an avoidance opening 31, which extends from one side of the reserved mold 3 into its interior, allowing the transverse reinforcing ribs 2 to overlap within the avoidance opening 31. This facilitates the separation of the composite slab body 1 and the reserved mold 3 after mold separation, reducing the difficulty of mold separation and improving the efficiency of mold separation. Simultaneously, the composite slab body 1 after mold separation has an avoidance groove 11. In subsequent construction, only the composite slab body 1 needs to be positioned and installed, eliminating the need for drilling holes in the composite slab body 1, reducing construction steps, improving construction efficiency, and lowering construction costs.

[0049] In this embodiment, the reserved mold 3 is a frame structure, which can reduce the amount of material used and reduce the cost of use.

[0050] In other embodiments, the reserved mold 3 may also be plate-shaped.

[0051] The clearance opening 31 is used to place the transverse reinforcing rib 2. The width of the clearance opening 31 can be the same or different. For example, see [link to example]. Figure 6 and Figure 7 Each clearance opening 31 has the same width, which is 3-8mm wider than the diameter of the transverse reinforcing rib 2. The uniform width of the clearance openings 31 reduces processing difficulty and improves processing efficiency. Simultaneously, the greater width of the clearance opening 31 allows for installation tolerances, ensuring that the transverse reinforcing rib 2 can be placed within the clearance opening 31, thus reducing installation difficulty and improving processing efficiency.

[0052] Specifically, the width of each clearance 31 is 5 mm greater than the diameter of the transverse reinforcing rib 2.

[0053] In this embodiment, the depth of each clearance opening 31 is not less than the depth of the transverse reinforcing rib 2 embedded in the composite slab body 1. The transverse reinforcing rib 2 can be completely placed in the clearance opening 31. If at least part of the transverse reinforcing rib 2 is located outside the clearance opening 31, after the transverse reinforcing rib 2 is placed in the clearance opening 31, the transverse reinforcing rib 2 is higher than the reserved mold 3, so that part of the concrete is located at the top of the reserved mold 3, which causes the clearance groove 11 formed after pouring to not penetrate the composite slab body 1, and thus cannot avoid the riser 100.

[0054] Specifically, the depth of each clearance opening 31 is greater than the depth of the transverse reinforcing rib 2 embedded in the composite slab body 1. It is not necessary to strictly control the depth of the clearance opening 31 to be equal to the depth of the transverse reinforcing rib 2 embedded in the composite slab body 1, which facilitates processing and improves processing efficiency.

[0055] To improve the overall strength of the composite plate body 1, in this embodiment, see... Figure 2 The composite slab used to install the riser 100 also includes reinforcing steel bars 4. These reinforcing steel bars 4 are sequentially tied to the transverse reinforcing bars 2 within the relief groove 11 along its circumference. Both ends of the reinforcing steel bars 4 are inserted into the composite slab body 1. The relief groove 11 is prone to becoming a weak point in terms of bending and crack resistance. The reinforcing steel bars 4, tied to the transverse reinforcing bars 2 along the circumference of the relief groove 11, form a ring-shaped support frame, dispersing the stress around the relief groove 11 to the transverse reinforcing bars 2. Simultaneously, the transverse reinforcing bars 2, inserted into the composite slab body 1 at both ends, form a strong anchorage with the composite slab body 1, preventing cracking or deformation of the relief groove 11 edges due to load after the riser 100 is installed. This further ensures the overall resistance of the composite slab to external forces, improves the overall strength of the composite slab body 1, and guarantees safety.

[0056] This invention also provides a construction method for composite slabs and risers, using composite slabs for installing risers, including the following steps: S1, setting the dimensions of the composite slab body 1, the dimensions of the clearance groove 11, the positional dimensions of the clearance groove 11 relative to the composite slab body 1, and the dimensions of the reserved mold 3 according to construction requirements, and drawing design drawings; S2, processing the composite slab body 1 according to the design drawings, fixing the casting mold and the reserved mold 3, pre-embedding the transverse reinforcing ribs 2 so that the transverse reinforcing ribs 2 pass through the clearance opening 31 of the reserved mold 3, pouring concrete, and after the concrete has set, separating the casting mold and the reserved mold 3 to obtain the composite slab body 1; S3, hoisting the composite slab body 1 to the installation position, fixing the composite slab body 1, positioning the riser 100, installing the riser 100, and adjusting the transverse reinforcing ribs 2 that interfere with the riser 100.

[0057] The construction method for composite slabs and risers provided by this invention involves drawing up plans based on the building dimensions before processing the composite slabs. This determines the dimensions of the composite slab body 1, the dimensions of the clearance groove 11, the position of the clearance groove 11 relative to the composite slab body 1, and the dimensions of the pre-reserved mold 3. The composite slab body cast according to the plans meets the construction requirements, avoiding delays caused by incorrect composite slab dimensions or deviations in the installation position of the clearance groove 11 and the riser 100, thus improving construction efficiency. Simultaneously, during the installation of the riser 100, the transverse reinforcing ribs 2 that interfere with the riser 100 are adjusted. The riser 100 can support the transverse reinforcing ribs 2, thereby improving the overall strength of the transverse reinforcing ribs 2, reducing safety hazards, and enhancing safety.

[0058] For example, in step S2, after the concrete is poured, a wire mesh is laid on the top surface of the concrete. After the concrete sets, the wire mesh is removed along with the pouring mold, forming a rough-surfaced concrete. The surface of the rough-surfaced concrete has many irregular tiny pits and protrusions, which can increase the contact area with the waterproof layer and improve the waterproof performance.

[0059] For example, after step S2, the transverse reinforcing ribs 2 in the relief groove 11 are cut off, so that the transverse reinforcing ribs 2 on both sides of the relief groove 11 extend into the relief groove 11 by 120-180mm respectively. The transverse reinforcing ribs 2 left in the relief groove 11 facilitate the connection of the reinforcing steel bars 4, improve the strength, and prevent the edge of the relief groove 11 from cracking or deforming due to the load borne by the riser 100 after installation.

[0060] Specifically, the transverse reinforcing ribs 2 on both sides of the clearance groove 11 each extend 150mm into the clearance groove 11.

[0061] For example, in step S3, support components 5 are fixed on the composite plate body 1 on both sides of the clearance groove 11. A connecting plate is fixedly installed on the top of the support components 5. The riser 100 passes through the connecting plate and the clearance groove 11 and is fixed by the fixing component 6. This fixes the riser 100 in the clearance groove 11, which facilitates subsequent pouring so that the riser 100 passes through the clearance groove 11 and forms a rigid whole with the composite plate body 1.

[0062] Specifically, see Figure 1 and Figure 2 The support assembly 5 includes stirrups 51, cement blocks 52, wooden blocks 53, bottom wooden beams 54, and top wooden beams 55. During support, stirrups 51 are vertically fixed to the main body 1 of the composite plate on both sides of the clearance groove 11. A cement block 52 is fixedly connected to the top of each stirrup 51, a wooden block 53 is fixedly connected to the top of each cement block 52, and a top wooden beam 55 is fixedly connected to the top of each wooden block 53. The top wooden beam 55 is simultaneously connected to two wooden blocks 53, and a bottom wooden beam 54 is fixedly connected to the bottom of the top wooden beam 55. A riser 100 is fixedly connected to the bottom of the bottom wooden beam 54. The aforementioned support assembly 5 is readily available, requiring no additional searching or purchase, thus improving construction efficiency and reducing construction costs.

[0063] It is understood that the top timber 55 is a connecting plate, and in other embodiments, the connecting plate may also be made of steel plate.

[0064] In other embodiments, the support component 5 may also be selected as needed; for example, the support component 5 includes a jack and timber.

[0065] Specifically, see Figure 1 The fixing component 6 includes a tie rod 61 and a U-shaped clip 62. The tie rod 61 and the U-shaped clip 62 are conventional components, and this embodiment will not describe in detail the structure, usage, and connection method of the tie rod 61 and the U-shaped clip 62. It should be noted that the top wooden block 55 and the bottom wooden block 54 have positioning holes for inserting the tie rod 61.

[0066] It should be noted that the above construction method is for construction scenarios where there is no supporting wooden board 300 under the composite slab. Therefore, the supporting component 5 is overlapped on the main body 1 of the composite slab to fix the riser 100. For construction scenarios where there is a supporting wooden board 300 under the composite slab, please refer to [link to relevant documentation]. Figure 3 Simply install the opening on the supporting wooden board 300, and then fix it with the tie rod 61 and the mountain-shaped clip 62.

[0067] Specifically, after step S3, the baffle is detachably connected to the composite plate body 1 below the clearance groove 11, and the clearance groove 11 is poured to fix the riser 100 to the composite plate body 1. Then, the support component 5 and the fixing component 6 are disassembled to install the remaining risers 100. The support component 5 and the fixing component 6 can be reused, which further improves the construction efficiency and reduces the construction cost.

[0068] The baffle is to support the poured concrete and prevent it from flowing out of the relief channel 11. It can be removed after the concrete has solidified.

[0069] For example, after all risers 100 are installed and fixed, a concrete layer 200 is poured on the top surface of the composite slab body 1. The concrete layer 200 is higher than the top surface of the risers 100, completely enclosing the risers 100. The load can be evenly transferred to the entire composite slab body 1 through the concrete, forming an integrated force-bearing system of "concrete layer 200 - riser 100 - composite slab", dispersing localized forces into surface forces, greatly reducing the risk of structural damage. In subsequent floor finishing processes, the concrete layer 200 can form a physical protective layer, isolating external impacts and corrosive factors, extending the service life of the risers 100.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A composite plate for installing risers, characterized in that, include: Composite slab body (1), the composite slab body (1) is cast and formed and has transverse reinforcing ribs (2) inside; The reserved mold (3) is a closed frame structure, and the height of the reserved mold (3) is not less than the thickness of the composite plate body (1). The reserved mold (3) is detachably connected to the composite plate body (1). The reserved mold (3) has multiple clearance openings (31). The multiple clearance openings (31) are spaced apart along the length direction of the reserved mold (3). Along the width direction of the reserved mold (3), the clearance openings (31) on both sides of the reserved mold (3) are aligned one by one. The clearance openings (31) on both sides of the reserved mold (3) extend from one side of the reserved mold (3) into the reserved mold (3). The clearance openings (31) are used to pass through the transverse reinforcing ribs (2). After the composite plate body (1) and the reserved mold (3) are cast, they are separated, so that the composite plate body (1) has a clearance groove (11). The clearance groove (11) is used to avoid the riser (100).

2. The composite plate for installing risers according to claim 1, characterized in that, Each of the clearance openings (31) has the same width, and the width of each clearance opening (31) is 3-8 mm greater than the diameter of the transverse reinforcing rib (2).

3. The composite plate for installing risers according to claim 1, characterized in that, The depth of each of the clearance openings (31) is not less than the depth of the transverse reinforcing rib (2) embedded in the composite plate body (1).

4. The composite plate for installing risers according to claim 1, characterized in that, It also includes reinforcing bars (4), which are tied sequentially to the transverse reinforcing bars (2) in the relief groove (11) along the circumference of the relief groove (11), and both ends of the reinforcing bars (4) are inserted into the composite plate body (1).

5. A method for constructing a composite slab and a riser, using the composite slab for installing the riser (100) as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Set the dimensions of the composite slab body (1), the dimensions of the clearance groove (11), the positional dimensions of the clearance groove (11) relative to the composite slab body (1), and the dimensions of the reserved mold (3) according to the construction requirements, and draw the design drawings. S2. Process the composite slab body (1) according to the design drawings, fix the casting mold and the reserved mold (3), embed the transverse reinforcing rib (2) and make the transverse reinforcing rib (2) pass through the clearance (31) of the reserved mold (3), pour concrete, and after the concrete is shaped, separate the casting mold and the reserved mold (3) to obtain the composite slab body (1). S3. Hoist the composite slab body (1) to the installation position, fix the composite slab body (1) and then position the riser (100), install the riser (100) and adjust the transverse reinforcing rib (2) that interferes with the riser (100).

6. The construction method for composite slabs and risers according to claim 5, characterized in that, In step S2, after the concrete is poured, a wire mesh is laid on the top surface of the concrete. After the concrete sets, the wire mesh is removed along with the pouring mold, forming a rough-surfaced concrete.

7. The construction method for composite slabs and risers according to claim 5, characterized in that, After step S2, the transverse reinforcing ribs (2) in the clearance groove (11) are cut off, so that the transverse reinforcing ribs (2) on both sides of the clearance groove (11) extend into the clearance groove (11) by 120-180mm respectively.

8. The construction method for composite slabs and risers according to claim 5, characterized in that, In step S3, a support assembly (5) is fixed on the composite plate body (1) on both sides of the clearance groove (11). A connecting plate is fixedly installed on the top of the support assembly (5). The riser (100) passes through the connecting plate and the clearance groove (11) and is fixed with a fixing assembly (6).

9. The construction method for composite slabs and risers according to claim 5, characterized in that, After step S3, the baffle is detachably connected to the composite plate body (1) below the clearance groove (11), and the clearance groove (11) is poured to fix the riser (100) to the composite plate body (1). Then the support assembly (5) and the fixing assembly (6) are removed to install the remaining risers (100).

10. The construction method for composite slabs and risers according to claim 9, characterized in that, After all risers (100) are installed and fixed, a concrete layer (200) is poured on the top surface of the composite slab body (1), and the concrete layer (200) is higher than the top surface of the risers (100).

Images