Anti-cracking top plate structure for main building in house building

Abstract

The invention relates to the technical field of house building structures, in particular to an anti-cracking roof structure for a main building in a house building, which comprises an upper concrete layer and a lower concrete layer, a reinforcing mesh is arranged on the upper surface of the lower concrete layer, and a plurality of reinforcing rib beams are arranged on the upper surface of the reinforcing mesh at intervals; a hollow cavity is formed among the multiple steel rib beams, and a hollow floor system is arranged in the hollow cavity. The reinforced rib beam comprises a plurality of main ribs and a plurality of stirrups used for fixing the main ribs, mounting plates are fixedly mounted on the two sides of each stirrup through two L-shaped plates, hollow rods are vertically and fixedly mounted on the upper surfaces and the lower surfaces of the mounting plates, inserting rods are vertically and slidably inserted into the hollow rods, and the inserting rods are fixedly mounted on the lower surfaces of the mounting plates. The inserting rod is sleeved with a telescopic spring. Through sliding of the hollow rods and the inserting rods and elastic force of the telescopic springs, the distance between the steel bar ribbed beams and the upper concrete layer and the distance between the steel bar ribbed beams and the lower concrete layer are adjusted in a self-adaptive mode, and structural stress concentration caused by factors such as temperature and shrinkage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and particularly relates to a crack - resistant roof slab structure for the main building in housing construction. Background Art

[0002] In housing construction, the roof slab structure of the main building is prone to cracking due to various factors such as temperature changes, concrete shrinkage, load effects, and uneven settlement of the foundation. The appearance of cracks will not only affect the aesthetics and service functions of the house, but may also reduce the bearing capacity and durability of the roof slab, and even endanger the safety of the building.

[0003] Chinese Patent with publication number CN214833895U discloses a crack - resistant roof slab structure for the main building in housing construction, which achieves a certain crack - resistant effect by setting structures such as a lower concrete layer, a hollow floor layer, and an upper concrete layer.

[0004] When the crack - resistant roof slab structure in the above - mentioned patent document faces extreme temperature changes, due to the lack of an adjustable connection structure, it cannot release the extrusion or tensile stress generated by the thermal expansion and contraction of concrete, which is easy to cause cracks. Moreover, during the hardening and shrinkage process of concrete, the rigid connection between the steel - bar rib beams and the upper and lower concrete layers cannot adapt to the shrinkage displacement, resulting in stress concentration. And when encountering uneven settlement of the foundation, the rigid roof slab is difficult to self - adjust, resulting in uneven local stress and exacerbating the generation of cracks. Summary of the Invention

[0005] The purpose of the present invention is to solve the following disadvantages in the prior art: when the existing crack - resistant roof slab structure faces extreme temperature changes, due to the lack of an adjustable connection structure, it cannot release the extrusion or tensile stress generated by the thermal expansion and contraction of concrete, which is easy to cause cracks. Moreover, during the hardening and shrinkage process of concrete, the rigid connection between the steel - bar rib beams and the upper and lower concrete layers cannot adapt to the shrinkage displacement, resulting in stress concentration. And when encountering uneven settlement of the foundation, the rigid roof slab is difficult to self - adjust, resulting in uneven local stress and exacerbating the generation of cracks. Therefore, a crack - resistant roof slab structure for the main building in housing construction is proposed.

[0006] In order to achieve the above - mentioned purpose, the present invention adopts the following technical solutions: A crack - resistant roof slab structure for the main building in housing construction, including an upper concrete layer and a lower concrete layer. A steel - bar mesh is provided on the upper surface of the lower concrete layer. A plurality of steel - bar rib beams are spacedly arranged on the upper surface of the steel - bar mesh. A hollow cavity is formed between the plurality of steel - bar rib beams. A hollow floor is provided in the hollow cavity. A fixing component for connecting the upper surface of the hollow floor with the upper concrete layer; The steel bar rib beam includes multiple main bars and multiple stirrups for fixing the multiple main bars. Both sides of the multiple stirrups are fixedly installed with mounting plates through two L-shaped plates. Hollow rods are vertically and fixedly installed on the upper and lower surfaces of the mounting plates. Insertion rods are vertically and slidably inserted into the hollow rods. Multiple slots are opened on the mutually approaching surfaces of the upper concrete layer and the lower concrete layer. One ends of the multiple hollow rods are respectively slidably inserted into the multiple slots, and one ends of the multiple insertion rods respectively abut against the slot walls of the multiple slots. A telescopic spring is sleeved on the insertion rod, and both ends of the telescopic spring respectively abut against the end of the hollow rod and the slot wall.

[0007] Preferably, the fixing component includes a fixing plate fixedly installed on the upper surface of the hollow floor and multiple settlement plates fixedly installed on the upper surface of the fixing plate. Card slots are symmetrically and horizontally opened on the lower surface of the fixing plate, and the two card slots are respectively used for two stirrups to enter. Two pairs of symmetrically arranged arc-shaped elastic buckles are fixedly installed on the lower surface of the fixing plate, and the elastic buckles are used for clamping the main bars.

[0008] Preferably, a mesh groove is opened on the upper surface of the lower concrete layer, and the steel bar mesh is embedded in the mesh groove.

[0009] Preferably, prestressing components are arranged in both the lower concrete layer and the upper concrete layer. The prestressing components are used to offset the tensile stress generated when the top plate is loaded or deformed, and improve the crack resistance performance.

[0010] Preferably, the prestressing components include multiple prestressing steel strands arranged in a criss-cross manner, and both ends of the prestressing steel strands are respectively fixed at the edge positions of the top plate through anchor devices.

[0011] Preferably, through holes are symmetrically and vertically opened on the upper surface of the main bars. The through holes on the surfaces of the multiple criss-crossed main bars correspond to each other, and vertical pins with a T-shaped longitudinal section are inserted into the multiple through holes. The longitudinal sections of the multiple through holes located above are T-shaped, and a displacement limiting block is fixedly installed at the top end of the pin.

[0012] Preferably, multiple groups of strengthening and supporting components are arranged in the hollow floor. The strengthening and supporting components are used to improve the overall stiffness and load-bearing capacity of the hollow floor.

[0013] Preferably, the strengthening and supporting components include strengthening and supporting columns with an I-shaped cross-section. The strengthening and supporting columns are vertically and fixedly installed in the hollow floor, and the bottom ends are fixedly connected to the lower concrete layer. The top ends of the strengthening and supporting columns penetrate through the hollow floor and are fixedly connected to the upper concrete layer.

[0014] Preselected, multiple sliding openings are vertically opened on the peripheral side walls of the hollow floor, and the multiple stirrups are respectively slidably arranged in the multiple sliding openings.

[0015] Preferably, strain gauges are pasted on the surfaces of the upper concrete layer and the lower concrete layer, and the strain gauges are connected to a data collector arranged in the main building through wires.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the sliding of the hollow rod and the insertion rod and the elastic force of the telescopic spring, the distance between the steel bar rib beam and the upper concrete layer and the lower concrete layer is adaptively adjusted, reducing the structural stress concentration caused by factors such as temperature and shrinkage; By tensioning the prestressed steel strand, the upper concrete layer and the lower concrete layer are pre-compressed, effectively offsetting the tensile stress of the roof slab, and significantly improving the crack resistance and bearing capacity; The high-strength I-shaped reinforced support columns cooperate with the steel bar rib beam to enhance the stiffness of the hollow floor slab and resist the deformation cracks caused by loads and settlements; With the help of the strain gauges, data is collected in real time and an over-limit alarm is given, which is convenient for timely maintenance and reinforcement of the roof slab to ensure the safety of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 1 is a front three-dimensional structural schematic diagram of a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 2 FIG. 2 is a partial three-dimensional structural schematic diagram of the upper concrete layer, the lower concrete layer, the fixing assembly and the steel bar rib beam in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 3 FIG. 3 is a partial three-dimensional structural schematic diagram of the lower concrete layer in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 4 FIG. 4 is a partial three-dimensional structural schematic diagram of the steel bar mesh in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 5 FIG. 5 is a partial three-dimensional structural schematic diagram of the hollow floor slab, the fixing assembly and the steel bar rib beam in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 6 FIG. 6 is a partial three-dimensional split structural schematic diagram of the steel bar rib beam in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 7 FIG. 7 is a partial three-dimensional structural schematic diagram of the L-shaped plate and the mounting plate in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 8 FIG. 8 is a partial three-dimensional structural schematic diagram of the fixing plate in a crack-resistant roof slab structure for a main building in a housing construction proposed by the present invention; Figure 9 FIG. Figure 3 is an enlarged structural schematic diagram at A in FIG. Figure 10 is Figure 5 The enlarged structural schematic diagram at position B in Figure 11 is Figure 7 The enlarged structural schematic diagram at position C in

[0018] In the figure: 1 upper concrete layer, 2 lower concrete layer, 3 steel mesh, 4 steel rib beams, 5 hollow floor, 6 fixing components, 61 fixing plate, 62 settlement plate, 63 card slot, 64 elastic snap, 7 main reinforcement, 8 stirrup, 9 L-shaped plate, 10 mounting plate, 11 hollow rod, 12 insertion rod, 13 slot, 14 telescopic spring, 15 mesh slot, 16 prestressed steel strand, 17 through hole, 18 bolt, 19 strengthening support column, 20 sliding hole, 21 strain gauge, 22 displacement limiting block. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Referring to Figures 1 - 11 , a crack-proof roof structure for the main building in building construction, includes an upper concrete layer 1 and a lower concrete layer 2. A steel mesh 3 is provided on the upper surface of the lower concrete layer 2. A plurality of steel rib beams 4 are spacedly arranged on the upper surface of the steel mesh 3. A hollow cavity is formed between the plurality of steel rib beams 4. A hollow floor 5 is provided in the hollow cavity. A fixing component 6 for connecting the upper surface of the hollow floor 5 with the upper concrete layer 1.

[0021] The steel rib beam 4 includes a plurality of main reinforcements 7 and a plurality of stirrups 8 for fixing the plurality of main reinforcements 7. Two L-shaped plates 9 are fixedly installed on both sides of the plurality of stirrups 8 to mount a mounting plate 10. Hollow rods 11 are vertically and fixedly installed on the upper and lower surfaces of the mounting plate 10. Insertion rods 12 are vertically and slidably inserted into the hollow rods 11. A plurality of slots 13 are opened on the mutually approaching surfaces of the upper concrete layer 1 and the lower concrete layer 2. One ends of the plurality of hollow rods 11 are respectively slidably inserted into the plurality of slots 13. One ends of the plurality of insertion rods 12 respectively abut against the slot walls of the plurality of slots 13. A telescopic spring 14 is sleeved on the insertion rod 12. Two ends of the telescopic spring 14 respectively abut against the end of the hollow rod 11 and the slot wall of the slot 13.

[0022] When the top plate expands and contracts due to temperature changes or the concrete itself shrinks, causing structural deformation, if the top plate expands due to heat, the upper concrete layer 1 and the lower concrete layer 2 expand outwards, the position of the steel rib beam 4 relative to the concrete layer changes, the hollow rod 11 slides in the slot 13 along the expansion direction, and the telescopic spring 14 is further compressed, absorbing the extrusion stress generated by the concrete expansion and relieving the stress concentration inside the structure. If the top plate shrinks due to cold or the concrete shrinks, the upper concrete layer 1 and the lower concrete layer 2 shrink inwards, the hollow rod 11 slides reversely in the slot 13, and the telescopic spring 14 rebounds and elongates, filling the gap generated by the shrinkage and providing elastic tension to prevent the concrete from cracking due to excessive tensile stress caused by shrinkage. Through the continuous and adaptive collaborative work of the hollow rod 11, the insertion rod 12 and the telescopic spring 14, the stress concentration inside the structure is effectively reduced, the stability of the crack-resistant top plate structure is enhanced, and the risk of crack generation is reduced.

[0023] The fixing component 6 includes a fixing plate 61 fixedly installed on the upper surface of the hollow floor 5 and multiple settling plates 62 fixedly installed on the upper surface of the fixing plate 61. Symmetrically horizontal card slots 63 are opened on the lower surface of the fixing plate 61, and the two card slots 63 are respectively used for two stirrups 8 to enter. Two pairs of symmetrically arranged arc-shaped elastic buckles 64 are fixedly installed on the lower surface of the fixing plate 61, and the elastic buckles 64 are used for clamping the main reinforcement 7.

[0024] Multiple elastic buckles 64 will respectively clamp multiple main reinforcements 7, and at the same time, two symmetrically arranged stirrups 8 will also be respectively located in the two card slots 63, which can not only limit the fixing plate 61, but also facilitate the cooperation between the fixing plate 61 and the main reinforcement 7 when horizontal expansion and contraction forces occur, so as to resist the horizontal cracking of the top plate.

[0025] A mesh groove 15 is opened on the upper surface of the lower concrete layer 2, and the steel mesh 3 is embedded in the mesh groove 15.

[0026] The concave-convex structure of the mesh groove 15 increases the contact area between the steel mesh 3 and the concrete. Through the concrete filling the groove body to form a "mechanical bite", it effectively prevents the steel mesh 3 from slipping when stressed, improves the collaborative working ability of the two. The steel mesh 3 is embedded in the mesh groove 15, which can more evenly disperse the tensile stress generated by the concrete shrinkage or temperature change, inhibit the development of cracks along the concrete surface or the interface of the steel mesh 3, and enhance the crack resistance of the lower concrete layer 2. The mesh groove 15 provides a clear installation positioning reference for the steel mesh 3, avoiding uneven cover thickness caused by the displacement of the steel mesh 3 during the concrete pouring process, ensuring the construction quality. The steel mesh 3 forms an integral body with the lower concrete layer 2 through the mesh groove 15, and can more directly transfer the load to the concrete matrix, reduce stress concentration, and improve the bearing capacity and durability of the structure.

[0027] Both the lower concrete layer 2 and the upper concrete layer 1 are provided with prestressing components. The prestressing components are used to offset the tensile stress generated when the roof slab is loaded or deformed, and improve the crack resistance performance. The prestressing components include multiple prestressing steel strands 16 arranged vertically and horizontally. The two ends of the prestressing steel strands 16 are respectively fixed at the edge positions of the roof slab through anchorages.

[0028] Before the concrete is poured, the prestressing steel strands 16 are tensioned by a tensioning device, so that the lower concrete layer 2 and the upper concrete layer 1 are in a prestressed state before use. When the roof slab bears a load or generates tensile stress due to deformation, the prestress can offset a part of the tensile stress and improve the crack resistance performance of the roof slab.

[0029] On the upper surface of the main reinforcement 7, through holes 17 are symmetrically and vertically opened. The through holes 17 on the surfaces of multiple staggered main reinforcements 7 are corresponding in position, and vertical pins 18 with a vertical cross-section are inserted into the multiple through holes 17. The vertical cross-sections of the multiple through holes 17 located above are T-shaped. A displacement limiting block 22 is fixedly installed at the top end of the pin 18. After the pin 18 is vertically inserted into the multiple through holes 17, the displacement limiting block 22 at its top end will abut against the hole wall of the through hole 17 located above, thereby restricting the downward movement of the pin 18.

[0030] After multiple groups of steel bar rib beams 4 are erected on the steel bar mesh 3, at this time, the through holes 17 on the surfaces of multiple staggered main reinforcements 7 are corresponding in position. Then, by vertically inserting multiple pins 18 into the multiple through holes 17 in the same vertical direction respectively, the effect of locking multiple groups of steel bar rib beams 4 can be achieved, avoiding the displacement of the steel bar rib beams 4 during the subsequent concrete pouring.

[0031] The hollow floor slab 5 is provided with multiple groups of strengthening support components. The strengthening support components are used to improve the overall stiffness and bearing capacity of the hollow floor slab 5. The strengthening support components include strengthening support columns 19 with an I-shaped cross-section. The strengthening support columns 19 are vertically and fixedly installed in the hollow floor slab 5, and the bottom ends are fixedly connected to the lower concrete layer 2. The top ends of the strengthening support columns 19 penetrate through the hollow floor slab 5 and are fixedly connected to the upper concrete layer 1.

[0032] The strengthening support columns 19 and the steel bar rib beams 4 act together to improve the overall stiffness and bearing capacity of the hollow floor slab 5, and reduce the deformation and cracks caused by load action or uneven settlement.

[0033] Multiple sliding openings 20 are vertically opened on the peripheral side walls of the hollow floor slab 5, and multiple stirrups 8 are respectively slidably arranged in the multiple sliding openings 20.

[0034] Before the hollow floor slab 5 is placed into the hollow cavity, multiple sliding openings 20 can be respectively aligned with multiple stirrups 8, and then the hollow floor slab 5 is vertically placed into the hollow cavity. At this time, multiple stirrups 8 will respectively slide into multiple sliding openings 20, forming a tight fitting relationship between the two, so that the hollow floor slab 5 is firmly connected to the reinforced rib beam 4. This connection method effectively restricts the lateral and vertical displacements of the hollow floor slab 5 in the hollow cavity, ensuring that when the hollow floor slab 5 bears the load, it can work together with the reinforced rib beam 4 to jointly bear and transfer the load, improving the bearing capacity of the entire roof slab structure. The mutual cooperation between the sliding openings 20 and the stirrups 8 tightly combines the hollow floor slab 5 and the reinforced rib beam 4 into a whole, enhancing the overall stiffness of the hollow floor slab 5. When the roof slab is subjected to temperature changes, concrete shrinkage or external loads, each part can deform coordinately, reducing local stress concentration caused by weak connections, reducing the risk of crack generation, and improving the stability and durability of the roof slab structure. The load borne by the hollow floor slab 5 can be directly transmitted to the reinforced rib beam 4 through the contact interface between the sliding openings 20 and the stirrups 8, and then transmitted to the upper concrete layer 1 and the lower concrete layer 2 through the reinforced rib beam 4, making the force transmission path of the entire roof slab structure more direct and clear, ensuring reasonable structural force and improving the mechanical properties of the structure.

[0035] Strain gauges 21 are pasted on the surfaces of both the upper concrete layer 1 and the lower concrete layer 2, and the strain gauges 21 are connected to a data collector arranged in the main building through wires.

[0036] The wires are used to connect the strain gauges 21 and the data collector in the main building, and their layout path needs to be planned and embedded in advance during the construction process. When constructing the lower concrete layer 2, after the wires are led out from the strain gauges 21, they are laid along the gaps of the steel mesh 3 and through the pre-embedded pipeline. The pipeline needs to be made of flame-retardant and corrosion-resistant materials, such as PVC pipes. The diameter of the pipeline is determined according to the quantity and specifications of the wires to ensure that the wires can pass through smoothly and are not damaged during the concrete pouring process. After the pipeline is led out of the lower concrete layer 2, it is fixed along the side of the reinforced rib beam 4 of the hollow floor slab 5 by tying or special pipe clamps to avoid displacement of the pipeline. When reaching the junction of the hollow floor slab 5 and the upper concrete layer 1, the pipeline continues to extend upward into the upper concrete layer 1 and is also laid along the gaps of the steel structure in the upper concrete layer 1 to the position where the data collector is located.

[0037] Inside the main building, the data acquisition instrument is usually installed in a dedicated equipment room or electrical shaft for easy centralized management and maintenance. After the wires are introduced into the main building, they are routed neatly through wire ducts or cable trays. The wire ducts or cable trays are made of metal and have good fire and dust prevention performance. Before the wires are connected to the data acquisition instrument, they need to be numbered and labeled to ensure that the wires corresponding to each strain gauge 21 are accurately connected to the input ports of the data acquisition instrument. The connection method uses welding or special terminal blocks to ensure reliable connection and stable signal transmission, so as to realize that the strain data collected in real time by the strain gauge 21 can be transmitted to the data acquisition instrument in a timely and accurate manner, and then transmitted by the data acquisition instrument to the control terminal for analysis and processing. When the monitored deformation exceeds the preset threshold, the control terminal sends an alarm signal so that corresponding reinforcement or adjustment measures can be taken in time.

[0038] In the present invention, when the top plate deforms due to temperature changes or concrete shrinkage, when it expands due to heat, the upper concrete layer 1 and the lower concrete layer 2 expand, and the hollow rod 11 slides in the slot 13 to compress the telescopic spring 14 to absorb the extrusion stress. When it shrinks due to cold, the upper concrete layer 1 and the lower concrete layer 2 shrink inward, the hollow rod 11 slides in the reverse direction, and the telescopic spring 14 rebounds to provide tension to make up for the gap. Through the coordinated work of the hollow rod 11, the plug rod 12 and the telescopic spring 14, stress concentration is reduced and the anti-cracking stability of the top plate is enhanced.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A crack - proof roof slab structure for the main building in house construction, comprising an upper concrete layer (1) and a lower concrete layer (2), characterized in that, The upper surface of the lower concrete layer (2) is provided with a steel mesh (3). Multiple steel rib beams (4) are spacedly arranged on the upper surface of the steel mesh (3). A hollow cavity is formed between the multiple steel rib beams (4). A hollow floor slab (5) is arranged in the hollow cavity. A fixing component (6) for connecting the upper surface of the hollow floor slab (5) with the upper concrete layer (1); The steel rib beam (4) includes multiple main reinforcement bars (7) and multiple stirrups (8) for fixing the multiple main reinforcement bars (7). Installation plates (10) are fixedly installed on both sides of the multiple stirrups (8) through two L-shaped plates (9). Hollow rods (11) are vertically and fixedly installed on the upper and lower surfaces of the installation plate (10). Insertion rods (12) are vertically and slidably inserted into the hollow rods (11). Multiple slots (13) are opened on the mutually approaching surfaces of the upper concrete layer (1) and the lower concrete layer (2). One ends of the multiple hollow rods (11) are respectively slidably inserted into the multiple slots (13). One ends of the multiple insertion rods (12) respectively abut against the slot walls of the multiple slots (13). A telescopic spring (14) is sleeved on the insertion rod (12). Two ends of the telescopic spring (14) respectively abut against the end of the hollow rod (11) and the slot wall of the slot (13).

2. The anti-cracking roof slab structure for the main building in housing construction according to claim 1, characterized in that, The fixing component (6) includes a fixing plate (61) fixedly installed on the upper surface of the hollow floor slab (5) and multiple settlement plates (62) fixedly installed on the upper surface of the fixing plate (61). Card slots (63) are symmetrically and horizontally opened on the lower surface of the fixing plate (61). The two card slots (63) are respectively used for two stirrups (8) to enter. Two pairs of symmetrically arranged arc-shaped elastic buckles (64) are fixedly installed on the lower surface of the fixing plate (61). The elastic buckles (64) are used for clamping the main reinforcement bars (7).

3. The anti-cracking roof slab structure for the main building in housing construction according to claim 1, characterized in that, A mesh groove (15) is opened on the upper surface of the lower concrete layer (2). The steel mesh (3) is embedded in the mesh groove (15).

4. A crack prevention roof slab structure for the main building in house construction according to claim 1, characterized in that, Prestressing components are arranged in both the lower concrete layer (2) and the upper concrete layer (1). The prestressing components are used to offset the tensile stress generated when the top plate is loaded or deformed, and improve the crack resistance performance.

5. The anti-cracking roof slab structure for the main building in house construction according to claim 4, characterized in that, The prestressing component includes multiple prestressing steel strands (16) arranged in a crisscross manner. Two ends of the prestressing steel strands (16) are respectively fixed at the edge positions of the top plate through anchor devices.

6. The anti-cracking roof slab structure for the main building in housing construction according to claim 1, characterized in that, Through holes (17) are symmetrically and vertically opened on the upper surface of the main reinforcement bar (7). The through holes (17) on the surfaces of the multiple crisscrossed main reinforcement bars (7) are corresponding in position. A plug (18) with a T-shaped longitudinal section is vertically inserted into the multiple through holes (17) located above. A displacement limiting block (22) is fixedly installed at the top end of the plug (18).

7. A crack prevention roof slab structure for the main building in housing construction according to claim 1, characterized in that, Multiple groups of strengthening and supporting components are arranged in the hollow floor slab (5). The strengthening and supporting components are used to improve the overall stiffness and load-bearing capacity of the hollow floor slab (5).

8. A crack - proof roof slab structure for the main building in housing construction according to claim 7, characterized in that, The reinforcing support member includes a reinforcing support column (19) with an I-shaped cross-section. The reinforcing support column (19) is vertically and fixedly installed in the hollow floor slab (5), and its bottom end is fixedly connected to the lower concrete layer (2). The top end of the reinforcing support column (19) penetrates through the hollow floor slab (5) and is fixedly connected to the upper concrete layer (1).

9. A crack prevention roof slab structure for the main building in house construction according to claim 1, characterized in that, A plurality of sliding openings (20) are vertically formed in the peripheral side walls of the hollow floor slab (5), and a plurality of stirrups (8) are respectively slidably arranged in the plurality of sliding openings (20).

10. A crack-resistant roof slab structure for the main building in housing construction according to claim 1, characterized in that, Strain gauges (21) are pasted on the surfaces of the upper concrete layer (1) and the lower concrete layer (2), and the strain gauges (21) are connected to a data collector arranged in the main building through wires.

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