CN112144720A - A staggered interlocking prefabricated concrete floor system and its construction method - Google Patents

Abstract

The invention discloses a prefabricated concrete floor slab system of staggered-seam interlocking type, which comprises a plurality of prefabricated floor slabs with interlaced concave-convex grid-shaped tooth slots, positive and negative staggered seams are interlocked for installation, and the upper and lower prefabricated floor slabs pass through the interlaced concave-convex grooves. The grid-like tooth grooves are closely connected, and the joints between the slabs are staggered. The slab joints between the two adjacent prefabricated floor slabs are pasted with FRP fiber cloth and epoxy resin. The strips are connected as a whole. The invention provides a brand-new prefabricated floor plan with novel and reasonable design, adopts the basic idea of "one-way prefabrication, positive and negative interlocking, staggered lap joint, and node strengthening", combined with "large slab prefabrication, split use ” prefabrication process, using the characteristics of the floor itself to complete the assembly construction, the slab end is reinforced with cast-in-place strips, and the slab joints are reinforced with FRP fiber cloth, which effectively improves the overall performance of the assembled floor structure and the assembly construction efficiency, saving human resource costs and economic benefits. Significant, conducive to promotion and use.

Description

A staggered interlocking prefabricated concrete floor system and its construction method

technical field

The invention relates to the technical field of prefabricated floor slabs of prefabricated structures, in particular to a staggered joint prefabricated prefabricated concrete floor slab system and a construction method thereof.

Background technique

A prefabricated building refers to a building formed by producing and processing some or all of the components used in the building in the factory, and then transporting it to the construction site, where it is installed and spliced. Therefore, the prefabricated building has the following four characteristics: first, the construction speed is fast; second, it is less affected by the climate; third, it saves a lot of labor; fourth, it is green and environmentally friendly. With its advantages of standardization, industrialization, industrialization, assembly, intensive, efficient, intelligent construction, energy saving and environmental protection, the state and local governments have successively issued corresponding policies to promote the development of standardized prefabricated industries. It can be said that the development of assembly Type building structure is the general trend of my country's construction industry.

In the current existing building system, the floor system is one of the most important components in the building structure system. The floor slab is the main lateral load-bearing member, which not only has the function of bearing the vertical load, but also has the function of linking the vertical members to form a lateral force resistance system and transmitting the horizontal wind load and seismic force. Most of the commonly used floor systems are cast-in-place reinforced concrete floor systems and some existing prefabricated floor systems. The integrity of the cast-in-place floor slab is good, but the on-site formwork support is heavy, and there are many wet operations. Considering the maintenance of the cast-in-place concrete, the construction period has been greatly extended, which does not meet the needs of the state to vigorously develop prefabricated buildings. In order to ensure the integrity of the floor, most of the commonly used prefabricated floor slabs are in the form of laminated floor slabs. In some factories, the prefabricated floor slabs are standardized and produced, and the laminated layers are poured on site. The floor slabs are only partially assembled. Large pouring volume, construction efficiency is not high. The prefabrication of the fully assembled floor is the highest, and there is no wet operation on site, which matches the construction efficiency of the main structure assembly. However, due to the problems of poor connection integrity and cracking and leakage of the slab joints, the technology of the fully assembled floor needs to be studied urgently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a staggered joint prefabricated prefabricated concrete floor system and its construction method, so as to solve the problem that the cast-in-place floor or superimposed floor has a large amount of wet work, the construction efficiency does not match the main frame assembly and construction, and the fully assembled floor is connected. Technical problems of poor integrity, cracking and leakage of plate seams.

For realizing the above-mentioned technical purpose, the present invention adopts following technical scheme:

A staggered interlocking prefabricated concrete floor system, comprising a plurality of prefabricated floor slabs, one side of the prefabricated floor slab is a clear water surface, and the other side is provided with protruding teeth and grooves that match each other in size, the protruding teeth and grooves are along the The slabs are arranged alternately in the form of grids, and the heights of both are 1/2 of the total thickness of a single prefabricated slab. The bottoms of the two are integral slabs with longitudinal force distribution steel bars and horizontal distribution bars that are bound and fixed to each other. Reinforcing bars, the longitudinal force distribution bars exceed a certain length of the end face of the prefabricated floor slab to form a throwing section;

The prefabricated floor slab is provided with two opposite layers at the installation position, the protruding teeth and grooves of the upper and lower prefabricated floor slabs are closely connected, and the joints between the adjacent two prefabricated floor slabs in each layer of the upper and lower layers are vertically upward. They are staggered, and the overlapping area between the upper and lower prefabricated floor slabs is half of the respective slab surface area to avoid through structural joints. The joints between the lower prefabricated slabs are pasted with FRP fiber cloth through epoxy resin. The ends of the prefabricated floor slabs are lapped on the secondary beams of the floor structure, and the longitudinal force distribution steel bars of the prefabricated floor slabs on both sides of the secondary beams are staggered and lapped and connected together by cast-in-place concrete strips.

Preferably, the ends of the longitudinal force distribution steel bars are thick, and the length of the lap section where the longitudinal force distribution bars of the prefabricated floor slabs on both sides of the secondary beam are staggered and overlapped is not less than 15 times the diameter of the steel bars.

Preferably, the width of the cast-in-place concrete strip is not less than 200mm, the overlapping length of the prefabricated floor slab and the secondary beam is not less than 50mm, and the contact surface between the prefabricated floor slab and the cast-in-place concrete strip is a chiseled surface.

Preferably, the horizontal projections of the protruding teeth and the grooves are all square, and the side length of the square projection is between 1/10 and 1/15 of the span of the prefabricated floor.

Preferably, the prefabricated floor surface where the FRP fiber cloth is attached is a chiseled surface.

In addition, the present invention also provides the above-mentioned construction method of a staggered interlocking prefabricated concrete floor slab system, comprising the following steps:

Step 1: One-way factory prefabrication of large slabs, determine the dimensions of each component of the prefabricated floor slabs according to parameter analysis and make pouring molds, apply mold release agent on the molds in advance, and bind longitudinal stress distribution steel bars and horizontal distribution steel bars on the mold supports. The longitudinal force distribution steel bars reserve a certain length of outgoing bars;

Step 2: Standard curing of floor slab pouring, pouring concrete in the mold and taking appropriate curing measures, demoulding after molding to form a large grid-like prefabricated slab with a flat surface and alternating convex teeth and grooves on the other side;

Step 3: Split and use prefabricated slabs: According to the specific design of structural beams, combined with on-site transportation and hoisting capabilities, select the appropriate floor width and modulus, and cut the prefabricated slabs into small prefabricated slabs;

Step 4: On-site assembly of positive and negative buckles. After transporting to the site, the prefabricated floor slabs are installed by means of positive and negative buckles and staggered lap joints. The convex teeth and grooves fit each other, which can effectively resist the slippage between floors, and the prefabricated floor slabs bite their teeth. The lap joints are laid between the secondary beams in turn;

Step 5: Strengthen the reliable connection of the slab joints. After the prefabricated slab is laid, the longitudinal stress distribution bars at the end of the prefabricated slab are staggered and cast-in-place concrete strips, and the prefabricated slab is connected as a whole at the top of the secondary beam to strengthen the structure. Integrity, epoxy resin glue is used to paste FRP fiber cloth at the joints between the lower prefabricated floor slabs. FRP fiber cloth can properly replace the force of the steel bars at the lower part of the slab, improve the bearing capacity of the slab, and ensure the reliable connection of the whole structure. Avoid later cracking problems.

Preferably, the mold described in step 1 includes a bottom formwork and a side formwork, the bottom formwork is made of grid-shaped profiled steel plates with alternating concave and convex, and side formworks are fixed around it. Correspondingly, there is a rib placement groove for the longitudinal force distribution steel bar to pass through, and the bottom end of the rib placement groove is located on the top envelope surface of the concave-convex surface of the bottom formwork.

Preferably, the prefabricated floor slabs described in step 4 are placed in the forward and reverse directions during transportation, and the edges of the prefabricated floor slabs that are engaged with each other are aligned, which increases the overall thickness of the floor slab and avoids exposure of the protruding teeth and grooves, preventing the floor slab from being transported. Broken or damaged corners of teeth and grooves in the process.

Compared with the prior art, the beneficial effects of the present invention are:

1. The prefabricated prefabricated floor slab of the present invention adopts the design idea of "prefabricated in one piece, cut and used, and assembled in pieces", with high degree of factory prefabrication, simple process, strong adaptability and low cost, and the floor slab is processed and prefabricated in the factory. The specially-made bottom mold of the grid-shaped profiled steel plate with alternating concave and convex, the large plate of standard size can be prefabricated in batches in one direction, the bottom mold plate can be reused after demoulding, and the cutting size after forming has strong adaptability. Can save transportation costs;

2. The prefabricated prefabricated floor slab of the present invention can realize the assembly connection of the floor slab system, which matches the construction efficiency of beam-column assembly, the construction is simple and the efficiency is high, the positive and negative interlocking connection between the floor slabs, the welding of the floor slab and the sub-beam embedded parts , The dry connection of the floor system can be carried out at the same time with the assembly of the structural beams and columns, saving the construction period and reducing the cost of human resources;

3. The prefabricated floor slab of the present invention, due to the staggered splicing of the upper and lower floors, avoids the problem that the traditional prefabricated floor slab is prone to through seams, and the staggered splicing enhances the integrity between the slabs and alleviates the shear resistance at the slab joints. problem, effectively reducing the difficulty of floor waterproofing;

4. For the prefabricated floor slab of the present invention, after the assembly is completed, both the top and the bottom are flat and smooth clear water surfaces, which avoids the problem of uneven bottom surface existing in the profiled steel plate composite floor or composite flat beam floor, and no ceiling is required in the later decoration. Treatment, reduce the owner's follow-up renovation costs;

5. The prefabricated prefabricated floor slab of the present invention has cast-in-place concrete strips at the position of the slab end reinforcement on the secondary beam, which enhances the connection of the node area, meets the principle requirements of strong nodes and weak components in the seismic design of the structural system, and enhances the performance of the prefabricated floor slab system. the overall performance of the structure;

6. In the prefabricated floor slab of the present invention, the longitudinal seam position is strengthened by FRP fiber cloth and epoxy resin glue, and the connection between the slab seams is reliable, which can avoid the problem of easy cracking of the slab seam position during the use of the prefabricated slab, and improve the performance of the prefabricated floor slab. The reliability of the long-term use of the floor system can also properly replace part of the reinforcement, reducing the overall reinforcement ratio;

To sum up, the present invention has novel and reasonable design, simple processing and fabrication of floor slabs, strong adaptability, assembly connection, and good overall performance, which can effectively improve the structural assembly efficiency, has significant economic benefits, and is easy to popularize and use.

Description of drawings

The above and/or other aspects and advantages of the present invention will become clearer and more easily understood from the detailed description taken in conjunction with the following drawings, which are only schematic and do not limit the present invention, wherein:

Fig. 1 is a structural schematic diagram of a fully assembled prefabricated floor slab structure involved in the present invention;

Fig. 2 is the enlarged schematic diagram of part A in Fig. 1;

3 is a schematic structural diagram of a prefabricated slab in a construction method for a fully assembled prefabricated floor structure according to the present invention;

4 is a schematic diagram of a method for splicing and splicing prefabricated large slabs in a construction method for a fully assembled prefabricated floor structure according to the present invention;

5 is a schematic structural diagram of a mold in a construction method for a fully assembled prefabricated floor structure according to the present invention;

FIG. 6 is an enlarged structural schematic diagram of part B in FIG. 5 .

Reference numerals: 1-prefabricated floor, 2-convex teeth, 3-groove, 4-longitudinal force distribution steel bar, 5-secondary beam, 6-bottom formwork, 7-side formwork, 8-rebar slot.

Detailed ways

Hereinafter, embodiments of a staggered interlocking prefabricated concrete floor slab system and a construction method thereof of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the description of the present application, and these technical solutions include any obvious technical solutions to the embodiments described herein. Alternative and modified technical solutions.

In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention.

The accompanying drawings in the present specification are schematic diagrams to assist in explaining the concept of the present invention, and schematically show the shapes of various parts and their mutual relationships. Please note that, in order to clearly represent the system of components of the embodiments of the present invention, the drawings are not drawn on the same scale. The same reference numerals are used to denote the same parts.

The principles and features of the present invention will be described below with reference to the accompanying drawings. The embodiments are only used to explain the present invention, but not to limit the scope of the present invention. Below in conjunction with Fig. 1-6, the preferred embodiment of the present invention is described in further detail:

As shown in Figures 1-6, a preferred staggered interlocking prefabricated concrete floor system of the present invention includes a plurality of prefabricated floor slabs 1, one side of the prefabricated floor slab 1 is a clean surface, and the other side is provided with mutually matching sizes. The convex teeth 2 and the grooves 3, the convex teeth 2 and the grooves 3 are arranged alternately in a grid shape along the board surface, the horizontal projections of the two are square, and their heights are 1/1 of the total thickness of the single prefabricated floor 1 2. The side length of the square projection is between 1/10 and 1/15 of the span of the prefabricated floor slab 1, and the integral slabs at the bottom of the two are equipped with longitudinal force distribution steel bars 4 and horizontal distribution bars that are bound and fixed to each other. Reinforcing bars, the longitudinal force distribution bars 4 exceed a certain length of the end face of the prefabricated floor slab 1 to form a throwing section;

The prefabricated floor slab 1 is provided with two opposite layers at the installation position. The protruding teeth 2 and the grooves 3 of the upper and lower prefabricated floor slabs 1 are closely connected with each other. 3. The joints between the adjacent two prefabricated floor slabs 1 on the upper and lower floors are vertically staggered, and the area of the occlusal overlap between the upper and lower prefabricated slabs 1 is half of the area of the respective slabs to avoid penetration. The joints between the lower prefabricated floors 1 are pasted with FRP fiber cloth through epoxy resin, and the prefabricated floor 1 where the FRP fiber cloth is pasted is chiseled, and the end of the prefabricated floor 1 is overlapped on the floor structure. On the secondary beam 5, and the lap length of the prefabricated floor 1 and the secondary beam 5 is not less than 50mm, the end of the throwing section of the longitudinal force distribution steel bar 4 is thick, and the throwing section of the prefabricated floor 1 located on both sides of the secondary beam 5 is thick. Longitudinal force distribution The steel bars 4 are staggered and overlapped with each other, and the length of the overlapped section is not less than 15 times the diameter of the steel bars. The width of the strip is not less than 200mm;

In this embodiment, the secondary beam 5 is made of 45A type I-beam, the length is 6000mm, the mold size is 9000mm in the longitudinal direction and 6000mm in the transverse direction, and the length and width of the concave-convex grid of the bottom template 6 are both 750mm and 50mm in height; the prefabricated large plate is One side is straight and smooth, and the other side is profiled steel plate-like concave-convex teeth with a thickness of 100mm. When cutting, the width of each small prefabricated floor slab 1 is 3000mm, and the width of the slab at the edge is 1500mm. The total thickness of the prefabricated slab 1 after cutting and splicing is 150mm, the prefabricated floor slab 1 is lapped on the upper flange of the I-beam. After the prefabricated floor slab 1 is spliced in place, the ribs of the prefabricated slabs 1 on both sides of the I-beam are staggered and overlapped, forming on the upper flange of the secondary beam 5. The grooves are then filled with concrete to fill the gaps in the upper grooves to form a whole.

The concrete construction method of the present invention comprises the following steps:

Step 1: One-way factory prefabrication of large slabs. Determine the dimensions of each component of the prefabricated floor slab 1 according to parameter analysis and make pouring molds. As shown in Figures 5-6, the molds include a bottom formwork 6 and a side formwork 7. The bottom formwork 6 It is made of grid-shaped profiled steel plates with alternating concavities and convexities, and side templates 7 are fixedly arranged around it, and a set of opposite side templates 7 are correspondingly provided with reinforcement grooves 8 for the longitudinal force distribution steel bars 4 to pass through. The bottom end of the rib groove 8 is located above the top envelope surface of the concave-convex surface of the bottom formwork 6. When the formwork is prefabricated, the mold release agent is pre-painted on the mold, and the longitudinal stress distribution steel bars 4 and the horizontal distribution steel bars are bound on the mold support. , the longitudinal force distribution steel bar 4 is pierced through the reinforcement groove 8 and a certain length of the reinforcement is reserved;

Step 2: Standard curing of floor slab pouring, pouring concrete in the mold and taking appropriate curing measures, demoulding after molding to form a large grid-like prefabricated slab with a flat side and a convex tooth 2 and a groove 3 on the other side, as shown in Figure 3 shown;

Step 3: Split and use prefabricated slabs: According to the specific design of structural beams, combined with on-site transportation and hoisting capabilities, select the appropriate floor width and modulus, and cut the prefabricated slabs into small prefabricated slabs 1, as shown in Figure 4 ;

Step 4: On-site assembly of positive and negative buckles, as shown in Figure 1 and Figure 4, the prefabricated floor slabs 1 are placed in positive and negative directions during transportation, and the edges of the prefabricated floor slabs 1 that are buckled with each other are aligned, which improves the overall thickness of the floor slab and avoids the need for The protruding teeth 2 and grooves 3 are exposed to prevent the floor slab from being broken during transportation or the corners of the protruding teeth 2 and grooves 3 are damaged. In the way, the protruding teeth 2 and the grooves 3 fit with each other, and the bite teeth are overlapped and laid between the secondary beams 5 in turn;

Step 5: Strengthen the reliable connection of the slab joints. As shown in Figure 2, after the prefabricated floor slab 1 is laid, the longitudinal stress distribution steel bars 4 at the end of the prefabricated slab 1 are staggered and cast-in-place concrete strips. The top is connected as a whole, and epoxy resin glue is used to paste FRP fiber cloth at the joints between the lower prefabricated floor slabs 1 .

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (8)

1. A staggered interlocking prefabricated concrete floor slab system, characterized in that it comprises a plurality of prefabricated floor slabs (1), one side of the prefabricated floor slab (1) is a clear water surface, and the other side is provided with convex teeth whose sizes match each other (2) and grooves (3), the protruding teeth (2) and grooves (3) are arranged alternately in a grid shape along the board surface, and the heights of both are 1% of the total thickness of the single prefabricated floor board (1). /2, the bottom of the two integral slabs are provided with longitudinal force distribution reinforcement bars (4) and transverse distribution reinforcement bars that are bound and fixed to each other. The length forms a throwing section; The prefabricated floor slab (1) is provided with two opposite layers at the installation position, the protruding teeth (2) and the grooves (3) of the upper and lower prefabricated floor slabs (1) are tightly engaged and connected, and the inner layers of the upper and lower layers are mutually connected. The joints between the two adjacent prefabricated floor slabs (1) are vertically staggered from each other, and the overlapping area between the upper and lower prefabricated floor slabs (1) is half of the area of the respective slabs, and the area between the lower prefabricated floor slabs (1) is FRP fiber cloth is pasted through epoxy resin at the joint of the floor, the end of the prefabricated floor slab (1) is overlapped on the secondary beam (5) of the floor structure, and the prefabricated floor slab (1) on both sides of the secondary beam (5) is lapped. The longitudinal force distribution reinforcement bars (4) in the slaughtering section are staggered and overlapped with each other and connected as a whole by cast-in-place concrete strips. 2. A staggered interlocking prefabricated concrete floor system according to claim 1, characterized in that: the longitudinal force distribution steel bars (4) are thicker at the ends and located on both sides of the secondary beam (5). The longitudinal force distribution of the cast-off section of the prefabricated floor slab (1) shall be no less than 15 times the diameter of the steel bar, and the length of the overlapping section where the steel bars (4) overlap each other. 3. A staggered interlocking prefabricated concrete floor system according to claim 1, characterized in that: the width of the cast-in-place concrete strip is not less than 200mm, the prefabricated floor (1) and the secondary beam (5) ) shall not be less than 50mm in length, and the contact surface between the prefabricated floor slab (1) and the cast-in-place concrete strip shall be a chiseled surface. 4. A staggered interlocking prefabricated concrete floor system according to claim 1, characterized in that: the horizontal projections of the protruding teeth (2) and the grooves (3) are squares, and the projections of the squares are square. The side length is between 1/10 and 1/15 of the span of the prefabricated floor slab (1). 5. A staggered interlocking prefabricated concrete floor system according to claim 1, characterized in that: the prefabricated floor (1) where the FRP fiber cloth is attached is a chiseled surface. 6. The construction method of a staggered interlocking prefabricated concrete floor system according to any one of claims 1-5, characterized in that, comprising the following steps: Step 1: One-way factory prefabrication of large slabs, determine the dimensions of each component of the prefabricated floor slabs according to parameter analysis (1) and make pouring molds, apply mold release agent on the molds in advance, and bind longitudinal force distribution steel bars on the mold supports (4) ) and horizontally distributed reinforcing bars, the longitudinal stress-distributing reinforcing bars (4) reserve a certain length of outgoing bars; Step 2: Standard curing of floor slab pouring, pouring concrete in the mold and taking appropriate curing measures, demoulding after molding to form a large grid-like prefabricated slab with a flat side and alternating convex teeth (2) and grooves (3) on the other side ; Step 3: Split use of prefabricated slabs: According to the specific design of structural beams, combined with on-site transportation and hoisting capabilities, select the appropriate floor width and modulus, and cut the prefabricated slabs into small prefabricated slabs (1); Step 4: On-site assembly of positive and negative buckles. After transporting to the site, the prefabricated floor slab (1) is installed by means of positive and negative buckles and staggered lap joints. The protruding teeth (2) and the grooves (3) fit each other, and the teeth overlap. Then lay it between the secondary beams (5) in turn; Step 5: Strengthen the reliable connection of the slab joints. After the prefabricated floor slab (1) is laid, the longitudinal force distribution steel bars (4) of the cast-off section at the end of the prefabricated slab (1) are staggered and cast-in-place concrete strips. 5) The top is connected as a whole, and the joints between the lower prefabricated floor slabs (1) are glued with epoxy resin glue and FRP fiber cloth. 7. The construction method of a staggered interlocking prefabricated concrete floor system according to claim 6, characterized in that: the mould described in step 1 comprises a bottom formwork (6) and a side formwork (7), so The bottom formwork (6) is made of grid-shaped profiled steel plates with alternate concavities and convexities, and side formworks (7) are fixedly arranged around it, and a set of opposite side formwork (7) is correspondingly provided with steel bars for longitudinal force distribution. (4) The rib placement groove (8) is protruded, and the bottom end of the rib placement groove (8) is located above the top envelope surface of the concave-convex surface of the bottom template (6). 8 . The construction method of a staggered interlocking prefabricated concrete floor system according to claim 6 , wherein the prefabricated floor slabs ( 1 ) described in step 4 are placed in positive and negative directions during transportation, and are mutually interlocked. Align the edges of the snap-fit precast slabs (1).

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