CN108678247A - A kind of prefabricated assembled light floor and its manufacturing method - Google Patents

Abstract

The invention discloses a prefabricated assembled lightweight floor slab and a manufacturing method thereof, belonging to the technical field of building materials. The invention provides a prefabricated light-weight floor slab composed of a concrete base, hollow steel pipes, panels, steel grids, hollow steel pipe holes, lightweight filling materials and bolt holes, and a manufacturing method thereof, which not only overcomes the traditional The self-heavy problem of pouring floor slabs also effectively solves the problem of low strength of lightweight concrete, which has great practical significance and engineering application value.

Description

A prefabricated lightweight floor slab and its manufacturing method

technical field

The invention relates to a prefabricated assembled lightweight floor slab and a manufacturing method thereof, belonging to the technical field of building materials.

Background technique

The prefabricated structural system refers to the building produced by making housing units or components according to uniform and standard building part specifications, and then transporting them to the construction site for assembly in place. It is characterized by light building weight, energy saving and environmental protection, fast construction speed, and high degree of industrialization. It can solve many problems such as low level of construction industrialization, low labor productivity in house construction, and low quality of traditional house products, and adapts to the development of the construction industry.

At present, the prefabricated floor slabs mainly used mainly include cast-in-place floor slabs and laminated floor slabs. The cast-in-place floor slab is a floor slab manufactured on site according to the design position, by setting up formwork, binding steel bars, pouring concrete, curing, and removing the formwork. Although the overall performance of cast-in-place slabs is relatively excellent, the workload of cast-in-place is large and the process is complicated, which not only affects the construction progress, but also does not conform to the existing design concept of prefabricated green buildings, and is not suitable for prefabricated buildings; The floor slab is an assembled monolithic floor slab formed by laminating prefabricated slabs and cast-in-place reinforced concrete layers. The prefabricated slab is completed in the factory, transported to the site and installed, the cast-in-place layer is cast in formwork, and the formwork is removed after maintenance to form a laminated floor slab. Laminated slabs can reduce the workload of on-site pouring and speed up the construction progress, but the connection strength between the prefabricated part and the cast-in-place part of the laminated slab is weak. Cracks occur during the process, which affects the performance of the floor.

Therefore, there is an urgent need to develop a new type of prefabricated floor slab that can reduce the pouring workload and ensure the performance.

There are two main methods for reducing the dead weight of floor slabs. The first is to use a hollow floor slab. The hollow floor slab means that during the prefabrication process of the floor slab, the internal mold is pre-embedded at the designated position of the floor slab to form a cavity, and then concrete is poured to form a hollow floor slab. This method can not only reduce the weight of the floor slab, but also reduce the consumption of materials, but the hollow floor generally has problems such as low strength and poor sound insulation effect; the second is to use lightweight concrete floor slabs, such as ceramsite concrete, wheat straw concrete and other materials for direct pouring This method also greatly reduces the weight of the floor, but due to its high cost and low strength, it has problems such as high cost and cannot be widely used.

Therefore, it is also very important to develop a new type of prefabricated floor that can not only reduce the weight of the floor, reduce the consumption of materials, but also ensure its strength.

Now try to combine the hollow floor with the concrete floor to develop a new type of prefabricated floor. However, the strength of the lightweight floor and the hollow floor is low. If the two forms are combined, the strength will be lower, and it is difficult to meet the architectural requirements. ; The concrete in the hollow part of the hollow floor slab is thin, and it is easy to cause cracks or damage. However, the existing lightweight concrete has poor ductility, and basically cracks and destroys. If the two forms are combined, the concrete in the hollow part is relatively thin. The strength is relatively low, the ductility is also relatively poor, and it is easy to be damaged. Therefore, how to effectively combine the lightweight floor and the hollow floor is a difficult problem.

Contents of the invention

In order to solve the above problems, the present invention provides a prefabricated lightweight floor slab and its manufacturing method, which not only overcomes the problem of the traditional cast-in-place floor slab's self-heaviness, but also effectively solves the problem of low strength of the hollow floor slab and lightweight concrete. The floor slabs of the present invention are all prefabricated in the factory, the construction process is simple, the production efficiency is greatly improved, the construction period is shortened, and the workload of cast-in-place is greatly reduced, which conforms to the national green building design concept; The integrity of the building is strengthened, which solves the problem of weak connection between the presupported part and the cast-in-place part of the ground and the floor slab; the floor slab is poured with high-performance concrete in the post-casting zone, which not only reduces the amount of pouring in construction, but also greatly strengthens the floor slab and steel beams The integrity of the structure can greatly improve the structural bearing capacity and ductility, which has great practical significance and engineering application value.

Technical scheme of the present invention is as follows:

The invention provides a prefabricated light floor slab. The light floor slab (1) consists of a concrete base (2), a hollow steel pipe (3), a panel (4), a steel grid frame (5), a hollow Steel pipe holes (6), lightweight filler material (7) and peg holes (8);

The concrete matrix (2) is poured inside the steel grid frame (5);

The hollow steel pipe (3) is located inside the steel grid frame (5);

The trim plate (4) connects two adjacent hollow steel pipes (3);

The steel grid frame (5) is formed by connecting longitudinal bars (9) and stirrup bars (10);

The hollow steel pipe holes (6) are distributed on the body of the hollow steel pipe (3);

The lightweight filling material (7) is filled inside the hollow steel pipe (3);

The peg holes (8) are distributed on the body of the lightweight floor slab (1).

In one embodiment of the present invention, the concrete matrix (2) is formed by mixing ceramsite, glass stone, cement, fly ash, sand, water reducing agent and water in a certain proportion.

In one embodiment of the present invention, the concrete matrix (2) per 1 ^m3 contains 130-160 kg of ceramsite, 200-230 kg of glass stone, 330-380 kg of cement, 30-60 kg of fly ash, and 680-750 kg of sand , Water reducing agent 4~6kg and water 150~180kg.

In one embodiment of the present invention, the ceramsite is ceramsite with a particle diameter of 5-8 mm.

In one embodiment of the present invention, the glass stone is glass stone with a particle diameter of 5-15 mm.

In one embodiment of the present invention, the cement is the cement of label 42.5.

In one embodiment of the present invention, the sand is medium sand.

In one embodiment of the present invention, the hollow steel pipe (3) is a thin-walled steel pipe with an outer diameter of 100 mm, a wall thickness of 5 mm, and a length of 3200 mm.

In one embodiment of the present invention, the distance between the central axes of the hollow steel pipes (3) is 200 mm.

In one embodiment of the present invention, the hollow steel pipes (3) are horizontally and evenly arranged inside the reinforcement grid (5).

In one embodiment of the present invention, the number of the hollow steel pipes (3) is six.

In one embodiment of the present invention, the panels (4) are evenly arranged between the hollow steel pipes (3).

In one embodiment of the present invention, the arrangement direction of the panels (4) is perpendicular to the arrangement direction of the hollow steel pipes (3).

In one embodiment of the present invention, the panel (4) connects two adjacent hollow steel pipes (3) by welding.

In one embodiment of the present invention, the patch (4) is a steel plate with a size of 100mm×50mm×5mm.

In one embodiment of the present invention, the spacing between the panels (4) is 1000mm.

In one embodiment of the present invention, the number of the panels (4) is ten.

In one embodiment of the present invention, the welding edge between the panel (4) and the hollow steel pipe (3) body is arc-shaped.

In one embodiment of the present invention, the cross-section of the reinforced grid (5) inside the lightweight floor (1) forms a closed structural system.

In one embodiment of the present invention, the diameter of the hollow steel pipe hole (6) is 3 mm.

In one embodiment of the present invention, the hollow steel pipe holes (6) are uniformly distributed in the hollow steel pipe (3) body.

In one embodiment of the present invention, the lightweight filling material (7) is lightweight glass wool.

In one embodiment of the present invention, the peg hole (8) is a round hole, a square hole or an oval hole.

In one embodiment of the present invention, the peg hole (8) is a circle with a diameter of 70mm.

In one embodiment of the present invention, the number of said peg holes (8) is eight.

In one embodiment of the present invention, the peg holes (8) are respectively located at the top and bottom of the body of the lightweight floor slab (1).

In one embodiment of the present invention, the peg hole (8) at the top of the light floor slab (1) is the same as the peg hole (8) at the bottom of the light floor slab (1). symmetry.

In one embodiment of the present invention, the peg holes (8) vertically penetrate through the body of the lightweight floor slab (1).

In one embodiment of the present invention, the diameter of the longitudinal ribs (9) is 12mm, and the spacing is 200mm.

In one embodiment of the present invention, the arrangement direction of the longitudinal ribs (9) is consistent with the arrangement direction of the hollow steel pipes (3).

In one embodiment of the present invention, the length of the longitudinal reinforcement (9) can be as long as that of the light floor slab (1).

In one embodiment of the present invention, the stirrups (10) have a diameter of 6mm and a distance of 100mm.

In one embodiment of the present invention, the arrangement direction of the stirrups (10) is perpendicular to the arrangement direction of the hollow steel pipes (3).

In one embodiment of the present invention, the hollow steel pipe (3) is 30 mm away from the bottom of the lightweight floor (1) body.

In one embodiment of the present invention, the panel (4) is 80 mm away from the bottom of the lightweight floor (1) body.

In one embodiment of the present invention, among the peg holes (8), the peg hole (8) on the outside is located 50 mm from the vertical end of the lightweight floor slab (1) and the hollow steel pipe (3). , 200mm from the horizontal end of the hollow steel pipe (3).

In one embodiment of the present invention, among the peg holes (8), the peg hole (8) on the inner side is located 50 mm from the vertical end of the lightweight floor slab (1) and the hollow steel pipe (3). , 400mm from the horizontal end of the hollow steel pipe (3).

In one embodiment of the present invention, the size of the lightweight floor (1) is 3000mm×1200mm×160mm.

In one embodiment of the present invention, the size of the steel grid (5) is 1150mm×120mm×2950mm.

The present invention provides the application of the above-mentioned prefabricated lightweight floor slab in the construction field.

The present invention provides the above-mentioned method for manufacturing a prefabricated lightweight floor slab, comprising the following steps:

Step 1: Binding the longitudinal reinforcement (9) and the stirrup (10) to form a cross-section closed reinforcement grid (5);

Step 2: filling the hollow steel pipe with lightweight filling material, and placing the hollow steel pipe (3) on the positioning support according to a certain interval;

Step 3: Weld adjacent hollow steel pipes (3) together with patch panels (4) to form a skeleton of hollow steel pipes;

Step 4: Put the hollow steel pipe skeleton obtained in Step 3 into the reinforced grid frame (5) obtained in Step 1;

Step 5: Install baffles around the outer sides of the reinforced grid frame (5) with hollow steel pipe skeleton inside the obtained step 4, and pre-embed bellows at the position of the peg holes (8);

Step 6: pouring concrete mixed with ceramsite, glass stone, cement, fly ash, sand, water reducing agent and water in the reinforcement grid (5) in step 5;

Step 7: After the curing of the concrete poured in step 6 is completed, the baffle is removed, the excess length of the hollow steel pipe (3) is cut off, and the pre-embedded bellows is taken out to obtain a lightweight floor slab (1).

In one embodiment of the present invention, the baffle is a detachable plywood.

The present invention provides a prefabricated assembled light floor slab prepared by the above method for manufacturing a prefabricated assembled lightweight floor slab.

The present invention provides the application of the manufacturing method of the above-mentioned prefabricated lightweight floor slab in the construction field.

The present invention also provides the above-mentioned assembling method of the prefabricated light-weight floor slab, in which a stud is respectively welded on the two wings of the steel beam, and then the peg is respectively inserted into the stud holes ( 8) In the center, bind the excess longitudinal reinforcement (9), pour the excess space inside the stud hole (8) with ordinary concrete, and finally fill the space between the steel beam and the two lightweight floor slabs (1) Pouring with high-performance concrete (11).

In one embodiment of the present invention, the peg is a steel nail with a cap diameter of 50 mm and a nail body diameter of 20 mm.

The present invention provides an application of the above-mentioned assembling method of a prefabricated lightweight floor slab in the construction field.

Beneficial effect:

(1) A kind of prefabricated assembled lightweight floor slab provided by the present invention not only overcomes the self-heavy problem of traditional cast-in-place floor slabs, but also effectively solves the problem of low strength of lightweight concrete;

(2) In the same situation, the weight of a prefabricated lightweight floor slab provided by the invention is reduced by 30% compared with that of a traditional cast-in-place floor slab, and its strength is more than 20% higher than that of a traditional lightweight concrete floor slab;

(3) The present invention forms a cavity inside the slab by arranging hollow steel pipes inside the slab, thereby reducing the weight of the slab itself, reducing the weight of the entire building, and reducing earthquake action;

(4) the present invention also strengthens the cohesiveness of steel pipe and concrete by punching holes on the steel pipe surface, effectively preventing the slippage of steel pipe;

(5) The floor slab of the present invention adopts a fully prefabricated method. Compared with the traditional laminated floor slab, secondary pouring on site is avoided, which not only ensures that the construction site is clean and tidy, but also has a working surface in advance. After the floor slab is installed, the floor can be used as a The next process is carried out on the working face, which saves the construction period;

(6) The present invention greatly enhances the thermal insulation effect of the floor slab and enhances the functionality of the floor slab by filling the hollow steel pipe with lightweight glass wool;

(7) The application of the present invention can solve the problems existing in floor slabs in the current prefabricated building structure system, and has great practical significance and engineering application value.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the prefabricated lightweight floor slab of the present invention;

Fig. 2 is a schematic diagram of steel pipe connection inside the prefabricated lightweight floor slab of the present invention;

Fig. 3 is the cross-sectional schematic view of the prefabricated assembled ceramsite glass stone light floor slab of the present invention;

Fig. 4 is the schematic diagram of the connection between the prefabricated lightweight floor slab and the steel beam of the present invention;

Fig. 5 is a perspective view of the connection between the prefabricated lightweight floor slab and the steel beam of the present invention;

Among them, 1 light-weight floor slab, 2 concrete matrix, 3 hollow steel pipe, 4 decorative plate, 5 steel grid frame, 6 hollow steel pipe hole, 7 lightweight filling material, 8 bolt hole, 9 longitudinal reinforcement, 10 stirrup and 11 high performance concrete.

Detailed ways

In order to have a clearer understanding of the technical solutions, purposes and effects of the present invention, the present invention will be further elaborated in conjunction with the accompanying drawings and embodiments:

The detection method used in the present invention is as follows:

Strength (bearing capacity) testing method: carry out the axial compression test in accordance with the "Standards for Test Methods of Ordinary Concrete Mechanics" and "Light Aggregate and Its Test Methods", use the electro-hydraulic servo loading system to carry out concentrated loading on the mid-span of the slab, and use the computer to collect The strength value of the slab.

Live load detection method: the detected strength (bearing capacity) is taken as F, then the mid-span bending moment M _a of the slab under concentrated force action = 1/2*F*(L/2)=F*L/4(1) , where L is the floor span.

In order to obtain the live load q, the slab is equivalent to a simply supported beam under uniform load, and the mid-span bending moment M _a of the simply supported beam under uniform load is 1/8*q*L ² (2), F*L/4=1/8*q*L ² can be obtained from (1)(2).

Density detection method: through the formula ρ=M/V, the density of the floor is obtained through the estimated weight.

Embodiment 1: The prefabricated lightweight floor slab of the present invention

As shown in Figures 1-3, this embodiment 1 provides a prefabricated light-weight floor slab. The composition of the light-weight floor slab 1 includes a concrete matrix 2, a hollow steel pipe 3, a decorative plate 4, a steel grid frame 5, and a hollow steel pipe hole. 6. Lightweight filling material 7 and peg holes 8;

The concrete matrix 2 is poured inside the reinforced grid 5;

The hollow steel pipe 3 is located inside the reinforced grid 5;

The trim plate 4 is connected to two adjacent hollow steel pipes 3;

The steel grid frame 5 is formed by connecting longitudinal bars 9 and stirrups 10;

The hollow steel pipe holes 6 are distributed on the body of the hollow steel pipe 3;

The lightweight filling material 7 is filled inside the hollow steel pipe 3;

The peg holes 8 are distributed on the body of the lightweight floor 1 .

Preferably, the concrete matrix 2 is formed by mixing ceramsite, glass stone, cement, fly ash, sand, water reducing agent and water in a certain proportion.

Preferably, the concrete matrix 2 per 1 m ³ contains 130-160 kg of ceramsite, 200-230 kg of glass stone, 330-380 kg of cement, 30-60 kg of fly ash, 680-750 kg of sand, 4-6 kg of water reducing agent and water 150～180kg.

Preferably, the ceramsite is ceramsite with a particle diameter of 5-8mm.

Preferably, the glass stone is glass stone with a particle diameter of 5-15 mm.

As a preference, the cement is the cement of the label 42.5.

Preferably, the sand is medium sand.

Preferably, the hollow steel pipe 3 is a thin-walled steel pipe with an outer diameter of 100 mm, a wall thickness of 5 mm, and a length of 3200 mm.

Preferably, the distance between the central axes of the hollow steel pipes 3 is 200mm.

Preferably, the hollow steel pipes 3 are horizontally and evenly arranged inside the steel grid 5 .

Preferably, the number of the hollow steel pipes 3 is six.

Preferably, the panels 4 are evenly arranged between the hollow steel pipes 3 .

Preferably, the arrangement direction of the panels 4 is perpendicular to the arrangement direction of the hollow steel pipes 3 .

Preferably, the panel 4 connects two adjacent hollow steel pipes 3 by welding.

Preferably, the panel 4 is a steel plate with a size of 100mm×50mm×5mm.

Preferably, the spacing between the panels 4 is 1000mm.

Preferably, the number of the panels 4 is ten.

Preferably, the welded edge between the panel 4 and the body of the hollow steel pipe 3 is arc-shaped.

Preferably, the cross-section of the reinforced grid 5 inside the lightweight floor 1 forms a closed structural system.

Preferably, the diameter of the hollow steel pipe hole 6 is 3 mm.

Preferably, the hollow steel pipe holes 6 are evenly distributed in the hollow steel pipe 3 body.

Preferably, the lightweight filling material 7 is lightweight glass wool.

Preferably, the peg hole 8 is a round hole, a square hole or an oval hole.

Preferably, the peg hole 8 is a circle with a diameter of 70 mm.

Preferably, the number of the peg holes 8 is eight.

Preferably, the peg holes 8 are respectively located at the top and bottom of the body of the lightweight floor slab (1).

Preferably, the peg holes 8 at the top of the light floor slab 1 are symmetrical to the peg holes 8 at the bottom of the light floor 1 .

Preferably, the peg hole 8 vertically runs through the body of the lightweight floor slab 1 .

As a preference, the diameter of the longitudinal ribs 9 is 12mm, and the pitch is 200mm.

Preferably, the arrangement direction of the longitudinal ribs 9 is consistent with the arrangement direction of the hollow steel pipe 3 .

Preferably, the length of the longitudinal reinforcement 9 can be as long as the lightweight floor 1 .

As a preference, the diameter of the stirrups 10 is 6mm, and the spacing is 100mm.

Preferably, the arrangement direction of the stirrups 10 is perpendicular to the arrangement direction of the hollow steel pipes 3 .

As a preference, the hollow steel pipe 3 is 30 mm away from the bottom of the lightweight floor 1 body.

As a preference, the panel 4 is 80 mm away from the bottom of the lightweight floor 1 body.

Preferably, among the peg holes 8 , the peg hole 8 on the outside is located 50 mm from the vertical end of the lightweight floor 1 body and the hollow steel pipe 3 , and 200 mm from the horizontal end of the hollow steel pipe 3 .

As a preference, among the peg holes 8 , the peg hole 8 located inside is located 50 mm from the vertical end of the lightweight floor 1 body and the hollow steel pipe 3 , and 400 mm from the horizontal end of the hollow steel pipe 3 .

Preferably, the size of the lightweight floor 1 is 3000mm×1200mm×160mm.

As a preference, the size of the steel grid 5 is 1150mm×120mm×2950mm.

The prefabricated lightweight floor slab of the present invention was prepared according to the above-mentioned most preferred scheme to test its strength, live load and density. (See Table 1 for the effect of the ratio of each component in the concrete matrix on the strength and weight of the floor slab)

Table 1 The effect of the proportion of each component in the concrete matrix on the strength, density and live load of the floor slab

It can be seen from the above table that, first of all, only the floor slab of the present invention has achieved a certain improvement in its bearing capacity compared with the existing floor slabs. If it is combined with the concrete of the present invention, its advantages in light weight will be more obvious.

Secondly, the better ratio is 120-170kg of ceramsite, 200-250kg of glass stone, 400-450kg of cement, 30-70kg of fly ash, 680-720kg of sand, 3-8kg of water reducing agent, and 130-180kg of water. Although the weight is about 10% heavier than that of lightweight ceramsite concrete under the same conditions, its bearing capacity has exceeded 20% of that of ceramsite concrete, which has high research and application value.

Finally, when the content of ceramsite is high, the strength and ductility of concrete will be reduced. When the content of glass stone is high, the weight of concrete will be increased and the thermal insulation performance of the floor will be reduced.

Embodiment 2: Preparation of prefabricated light-weight floor slab of the present invention

This embodiment 2 provides a method for manufacturing a prefabricated lightweight floor slab in embodiment 1, including the following steps:

Step 1: binding the longitudinal bars 9 and the stirrups 10 to form a cross-section closed steel bar grid 5;

Step 2: filling the hollow steel pipe with lightweight filling material, and placing the hollow steel pipe 3 on the positioning support according to a certain interval;

Step 3: Weld the adjacent hollow steel pipes 3 together with the trim plate 4 to form the skeleton of the hollow steel pipes;

Step 4: Put the hollow steel pipe skeleton obtained in Step 3 into the reinforced grid frame 5 obtained in Step 1;

Step 5: Install baffles around the outer sides of the reinforced grid frame 5 with hollow steel pipe skeletons inside the obtained step 4, and pre-embed corrugated pipes at the positions of the stud holes 8;

Step 6: Concrete mixed with ceramsite, glass stone, cement, fly ash, sand, water reducing agent and water is poured inside the reinforced grid 5 in step 5;

Step 7: After the curing of the concrete poured in Step 6 is completed, the baffle plate is removed, the excess length of the hollow steel pipe 3 is cut off, and the pre-embedded bellows is taken out to obtain the lightweight floor 1;

Preferably, the baffle is a detachable plywood.

Embodiment 3: The use of the prefabricated light-weight floor slab of the present invention

As shown in Figure 4-5, this embodiment 3 provides an assembly method of a prefabricated lightweight floor slab in embodiment 1. A stud is welded on the two wings of the steel beam, and then the stud is inserted into the adjacent two In the center of the stud hole 8 of a lightweight floor 1, the excess longitudinal reinforcement 9 is bound, and the excess space inside the stud hole 8 is poured with ordinary concrete, and finally the steel beam is placed between the two lightweight floor 1 The voids are poured with high performance concrete 11.

Preferably, the peg is a steel nail with a cap diameter of 50mm and a nail body diameter of 20mm.

Comparative example 1

The preparation method is as follows:

(1) Binding steel bars: Bind the longitudinal bars and stirrups according to the design position to form the main steel bar grid;

(2) Formwork support: support the formwork at the bottom and surroundings of the bound steel grid and fix it;

(3) Pouring: Pour the well-mixed ordinary C20 concrete into the reinforced grid and vibrate evenly;

(4) Curing: Curing the poured concrete floor for 28 days under standard conditions;

(5) Formwork removal: After the maintenance is completed, the formwork is removed to obtain a common concrete floor.

The size of the above-mentioned ordinary floor slab is controlled to be 3000mm×1200mm×160mm in order to test its strength, live load and density.

The test results are: density: 2480kg/m ³ , live load: 5.6KN/m ² .

It can be seen from Example 1 and Comparative Example 1 that, compared with the common floor, the bearing capacity of the floor of the present invention has made a certain progress compared with the existing floor, if it is combined with the concrete of the present invention. The advantage of its density is more obvious. .

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the claims.

Claims (10)

1. A prefabricated assembled lightweight floor, characterized in that the components of the lightweight floor (1) include a concrete matrix (2), hollow steel pipes (3), trim panels (4), steel grids (5 ), hollow steel pipe hole (6), lightweight filling material (7) and stud hole (8); The concrete matrix (2) is poured inside the steel grid frame (5); The hollow steel pipe (3) is located inside the steel grid frame (5); The trim plate (4) connects two adjacent hollow steel pipes (3); The steel grid frame (5) is formed by connecting longitudinal bars (9) and stirrup bars (10); The hollow steel pipe holes (6) are distributed on the body of the hollow steel pipe (3); The lightweight filling material (7) is filled inside the hollow steel pipe (3); The peg holes (8) are distributed on the body of the lightweight floor slab (1). 2. A prefabricated assembled lightweight floor slab as claimed in claim 1, characterized in that the concrete matrix (2) is made of ceramsite, glass stone, cement, fly ash, sand, water reducer and water press mixed in a certain proportion. 3. A prefabricated light-weight floor slab according to claim 1 or 2, characterized in that, the hollow steel pipes (3) are horizontally and evenly arranged inside the reinforcement grid (5). 4. A prefabricated assembled lightweight floor slab according to any one of claims 1-3, characterized in that, the trim panels (4) are evenly arranged between the hollow steel pipes (3); The arrangement direction of the trim plate (4) is perpendicular to the arrangement direction of the hollow steel pipe (3); The patch (4) connects two adjacent hollow steel pipes (3) by welding. 5. A prefabricated assembled lightweight floor slab according to any one of claims 1-4, characterized in that the hollow steel pipe holes (6) are evenly distributed in the hollow steel pipe (3) body. 6. A prefabricated assembled lightweight floor slab according to any one of claims 1-5, characterized in that the arrangement direction of the longitudinal ribs (9) is consistent with the arrangement direction of the hollow steel pipes (3). 7. A prefabricated assembled lightweight floor slab according to any one of claims 16, characterized in that, the arrangement direction of the stirrups (10) is perpendicular to the arrangement direction of the hollow steel pipes (3). 8. A prefabricated assembled lightweight floor as claimed in any one of claims 1-7, characterized in that the hollow steel pipe (3) is 30mm away from the bottom of the lightweight floor (1) body; The panel (4) is 80mm away from the bottom of the lightweight floor (1) body; Among the peg holes (8), the peg hole (8) on the outside is located 50 mm from the vertical end of the lightweight floor (1) body and the hollow steel pipe (3), and 200 mm from the horizontal end of the hollow steel pipe (3). place; Among the peg holes (8), the peg hole (8) on the inner side is located 50 mm from the vertical end of the lightweight floor (1) body and the hollow steel pipe (3), and 400 mm from the horizontal end of the hollow steel pipe (3). place. 9. A method for manufacturing a prefabricated lightweight floor slab according to any one of claims 1-8, characterized in that it comprises the following steps: Step 1: Binding the longitudinal reinforcement (9) and the stirrup (10) to form a cross-section closed reinforcement grid (5); Step 2: filling the hollow steel pipe with lightweight filling material, and placing the hollow steel pipe (3) on the positioning support according to a certain interval; Step 3: Weld adjacent hollow steel pipes (3) together with patch panels (4) to form a skeleton of hollow steel pipes; Step 4: Put the hollow steel pipe skeleton obtained in Step 3 into the reinforced grid frame (5) obtained in Step 1; Step 5: Install baffles around the outer sides of the reinforced grid frame (5) with hollow steel pipe skeleton inside the obtained step 4, and pre-embed bellows at the position of the peg holes (8); Step 6: pouring concrete mixed with ceramsite, glass stone, cement, fly ash, sand, water reducing agent and water in the reinforcement grid (5) in step 5; Step 7: After the curing of the concrete poured in step 6 is completed, the baffle is removed, the excess length of the hollow steel pipe (3) is cut off, and the pre-embedded bellows is taken out to obtain a lightweight floor slab (1). 10. The application of a prefabricated assembled lightweight floor slab according to any one of claims 1-8 or a manufacturing method of a prefabricated assembled lightweight floor slab described in claim 9 in the construction field.