Prefabricated floor side joint structure and connecting method thereof

Abstract

This invention relates to the field of building engineering technology and discloses a precast floor slab side joint structure and its connection method. The structure includes precast floor slabs, arc-shaped connecting rods, and a flexible waterproof layer. Right and left connecting holes are respectively opened at the head and tail ends of adjacent precast floor slabs, which are connected after splicing to form an arc-shaped connecting hole. An arc-shaped connecting rod is installed inside the hole for pre-tightening. A grouting gap is reserved at the joint surface of the floor slabs, and flexible waterproof mortar is injected to form a flexible waterproof layer communicating with the connecting hole. Overlapping protrusions are provided at the ends of the floor slabs for locking and positioning with overlap grooves. A stress gap is reserved at the overlap and a rubber sheet is embedded inside. A sealant is applied to the top of the joint. The connector is housed in a countersunk hole and covered with a hole cap flush with the slab surface. This invention improves the shear resistance of the joint and the overall structural integrity. Adjacent floor slabs are connected by overlapping, achieving pre-positioning, facilitating construction, forming a continuous waterproof barrier, leaving gaps to release deformation stress, preventing cracking, and improving the durability of the floor slab.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a prefabricated floor slab side joint structure and its connection method. Background Technology

[0002] Prefabricated concrete buildings are the core direction for the transformation and upgrading of my country's construction industry. As the core horizontal load-bearing component, the connection quality of the side joints of prefabricated concrete floor slabs directly determines the structural integrity, safety and durability of the building, and is a key technical node in the construction of prefabricated buildings.

[0003] The existing precast floor slab side joints generally adopt the post-cast concrete connection process, which involves first binding or welding the pre-reserved protruding steel bars on the side of the adjacent floor slabs, and then pouring concrete to achieve structural connection; waterproofing relies on surface treatment methods such as applying waterproof coating, pasting roll material, or filling the top with sealant.

[0004] The existing technology has several obvious defects: it lacks an active pre-tensioning structure and relies solely on concrete bonding and transverse binding or welding of steel bars for fastening, resulting in insufficient shear bearing capacity; the post-cast concrete at the joints does not leave space for deformation release, and the internal stress generated by temperature changes and concrete shrinkage and creep cannot be effectively released, which can easily lead to cracking of the concrete at the joints and weaken the structural durability; it only does surface waterproofing without forming an internal continuous barrier, and the seepage path cannot be effectively blocked, which can easily lead to water seepage at the joints of the floor slab, affecting the overall strength and subsequent construction. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a prefabricated floor slab side joint structure and its connection method to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a prefabricated floor slab side joint structure, comprising a prefabricated floor slab, an arc-shaped connecting rod, and a flexible waterproof layer.

[0007] Furthermore: multiple right connecting holes penetrating to the top of the precast floor slab are provided on the end face of the front end of the precast floor slab, and multiple left connecting holes penetrating to the top of the precast floor slab are provided on the end face of the rear end of the precast floor slab. The front and rear ends of two adjacent precast floor slabs are connected, and the right connecting holes and left connecting holes of two adjacent precast floor slabs are connected to each other, forming a complete arc-shaped connecting hole.

[0008] Furthermore: the arc-shaped connecting rod is installed in the right connecting hole and the left connecting hole connecting two adjacent precast floor slabs.

[0009] Furthermore: a grouting gap is left between the joint surfaces of two adjacent precast floor slabs, and flexible waterproof mortar is injected into the grouting gap to form a flexible waterproof layer. The grouting gap is connected to the right connection hole and the left connection hole.

[0010] Furthermore: the upper part of the end face of the front end of the precast floor slab is provided with an overlapping protrusion, and the upper part of the end face of the rear end is provided with an overlapping groove. The front and rear ends of two adjacent precast floor slabs are connected by the overlapping protrusions being fastened into the overlapping groove.

[0011] Furthermore, the upper edge of both the overlapping protrusion and the overlapping groove is chamfered, and the upper joint of the overlapping protrusion and overlapping groove of two adjacent precast floor slabs is sealed with sealant.

[0012] Furthermore: a gap is left between the surfaces where the overlapping protrusion and the overlapping groove meet. The gap between the two vertical surfaces is the transverse stress gap, and the gap between the two horizontal surfaces is the longitudinal stress gap. A rubber sheet is provided in both the transverse stress gap and the longitudinal stress gap. A rubber sheet is also provided between the contact surfaces below the grouting gap of two adjacent precast floor slabs.

[0013] Furthermore, the top of the precast floor slab near the head end is provided with a grouting hole that communicates with the grouting gap between two adjacent precast floor slabs.

[0014] Furthermore: the arc-shaped connecting rod includes a rod body, which fits against the wall of the arc-shaped connecting hole formed by the rod body communicating with the right connecting hole and the left connecting hole. The head of the rod body is provided with a rod head with a diameter larger than that of the right connecting hole, and the tail of the rod body is provided with a thread, and a connecting nut is fitted at the thread of the tail of the rod body.

[0015] Furthermore, gaskets are provided between the rod head and the connecting nut and the precast floor slab, and the gaskets are fitted onto the rod body.

[0016] Furthermore, multiple countersunk holes are provided on the top surface of the precast floor slab, and the right connecting hole and the left connecting hole are connected to the countersunk holes. The rod head of the arc-shaped connecting rod and the connecting nut are both set in the countersunk holes.

[0017] Furthermore, each of the countersunk holes is provided with a hole cover, which is fitted into the top opening of the countersunk hole, and the upper surface of the hole cover is flush with the upper surface of the precast floor slab.

[0018] A method for connecting the side joints of prefabricated floor slabs, characterized by comprising the following steps:

[0019] S1. Rubber sheets are pasted on the side and bottom surfaces of the lap grooves at the tail ends of each precast floor slab, as well as on the mating surfaces at the lower part of the head ends of the precast floor slabs.

[0020] S2. Connect the head end and tail end of the two precast floor slabs, and align the right connecting holes and left connecting holes of the two adjacent precast floor slabs. Insert the overlapping protrusions into the overlapping grooves.

[0021] S3. Place a washer on the body of each connecting rod, insert each connecting rod into the corresponding right connecting hole and the mating left connecting hole, and leave the rod head of the arc-shaped connecting rod in the countersunk hole on the corresponding side.

[0022] S4. Put a washer on the end of the arc-shaped connecting rod and tighten the connecting nut. The connecting nut of the arc-shaped connecting rod is left in the countersunk hole on the corresponding side.

[0023] S5. Install hole covers on top of each countersunk hole;

[0024] S6. Inject flexible waterproof mortar into the grouting gap between two adjacent precast floor slabs through the grouting hole. The flexible waterproof mortar enters the grouting gap and flows along the grouting gap to fill all the gaps. At the same time, it seeps into the gap between the connecting hole and the arc-shaped connecting rod. After the waterproof mortar solidifies, it forms a flexible waterproof layer.

[0025] S7. Fill the gaps between the overlapping protrusions and grooves of two adjacent precast floor slabs with sealant to form sealant caulking.

[0026] The present invention has the following beneficial effects:

[0027] 1. The arc-shaped connecting holes connecting adjacent precast floor slabs are connected to the arc-shaped connecting rods. The rod head is fitted with a threaded nut to apply pre-tightening force. At the same time, the interlocking design of the overlapping protrusions into the overlapping grooves not only restricts the horizontal and vertical displacement of the floor slabs and improves the shear bearing capacity of the joints, but also enables rapid and accurate positioning, which enhances the overall structure and improves the efficiency of on-site construction.

[0028] 2. A flexible waterproof mortar layer is formed by injecting flexible waterproof mortar through the grouting gaps inside. The top is set with an oil sealant to seal the joints. The overlapping structure itself blocks the seepage path, and the grouting gaps are connected to the connecting holes. The waterproof mortar can simultaneously fill the gaps between the connecting rod and the hole wall, realizing the integration of joint sealing and connecting rod anchoring.

[0029] 3. Reserve transverse and longitudinal stress gaps between the overlapping protrusions and the overlapping grooves. Rubber sheets are installed in the gaps and at the bottom of the grouting gaps. This provides space for the deformation caused by temperature changes and concrete shrinkage and creep, and can also absorb stress through the elasticity of the rubber to avoid structural cracking and prevent grout leakage.

[0030] 4. The head of the connecting rod and the nut are completely retracted into the countersunk hole of the precast floor slab. A hole cover flush with the floor slab is added on top to ensure that the top surface of the floor slab is flat and does not affect subsequent floor decoration. It also prevents water and dust from entering, avoids corrosion of the connecting parts, and eliminates the risk of people tripping. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the structure of the present invention;

[0032] Figure 2 for Figure 1 Enlarged view of section A;

[0033] Figure 3 for Figure 1 Enlarged view of section B;

[0034] Figure 4 This is a structural sectional view of a precast floor slab.

[0035] Figure 5 This is a structural schematic diagram of the end of a precast floor slab.

[0036] Figure 6 This is a structural sectional view of the overlap between adjacent precast floor slabs;

[0037] Figure 7 This is a schematic diagram of the arc-shaped connecting rod.

[0038] Legend:

[0039] 1. Precast floor slab; 11. Right connecting hole; 12. Left connecting hole; 13. Countersunk hole; 14. Overlapping protrusion; 15. Overlapping groove; 16. Grouting hole; 17. Grouting gap; 18. Transverse stress gap; 19. Longitudinal stress gap; 2. Arc-shaped connecting rod; 21. Rod body; 22. Rod head; 23. Connecting nut; 24. Washer; 3. Hole cover; 4. Sealant caulking; 5. Flexible waterproof layer; 6. Rubber sheet. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Reference Figure 1-7 A prefabricated floor slab side joint structure includes a prefabricated floor slab 1, an arc-shaped connecting rod 2, and a flexible waterproof layer 5.

[0043] Multiple right connecting holes 11 are provided on the end face of the precast floor slab 1 at the front end, extending to the top of the precast floor slab 1. The right connecting holes 11 are evenly distributed along the length of the end of the floor slab, which can ensure that the force is evenly distributed when the adjacent floor slabs are connected, and avoid cracking and damage of the floor slab caused by local stress concentration. Multiple left connecting holes 12 are provided on the end face of the precast floor slab 1 at the rear end, extending to the top of the precast floor slab 1. The number, diameter and opening height of the left connecting holes 12 correspond one-to-one with the right connecting holes 11, which can ensure accurate alignment during splicing.

[0044] The head and tail ends of two adjacent precast floor slabs 1 are connected, and the right connecting hole 11 and the left connecting hole 12 of two adjacent precast floor slabs 1 are connected to form a complete arc-shaped connecting hole. The arc-shaped hole design can accommodate the installation of the arc-shaped connecting rod 2. At the same time, when the floor slab is subjected to vertical load and undergoes slight deformation, the arc-shaped structure can disperse stress through its own curvature, reduce the shear stress concentration of the connecting rod, and improve the shear reliability.

[0045] The arc-shaped connecting rod 2 is installed in the right connecting hole 11 and the left connecting hole 12 that connect two adjacent precast floor slabs 1. It can tightly tie the two adjacent precast floor slabs 1 together, effectively restrict the relative displacement of the floor slabs in the horizontal and vertical directions, and improve the overall integrity and shear resistance of the floor slabs.

[0046] A grouting gap 17 is left between the joint surfaces of two adjacent precast floor slabs 1. Flexible waterproof mortar is injected into the grouting gap 17 to form a flexible waterproof layer 5. The grouting gap 17 is connected to the right connecting hole 11 and the left connecting hole 12. During grouting, the waterproof mortar can simultaneously fill the gap between the connecting hole and the arc-shaped connecting rod 2, which can not only anchor and protect the arc-shaped connecting rod 2 and extend the service life of the connecting rod 2, but also form a continuous and complete waterproof barrier at the joint.

[0047] Example 2

[0048] Based on Embodiment 1, an overlapping protrusion 14 is provided on the upper surface of the end face of the precast floor slab 1. The overlapping protrusion 14 is precast integrally with the precast floor slab 1 and has the same structural strength as the floor slab body. An overlapping groove 15 is provided on the upper surface of the end face of the precast floor slab 1. The size of the overlapping groove 15 is adapted to the size of the overlapping protrusion 14, which can ensure that the overlapping protrusion 14 can be smoothly embedded. The end faces of two adjacent precast floor slabs 1 are connected by the overlapping protrusion 14 being fastened into the overlapping groove 15. This concave-convex overlapping joint structure can not only play a role in quick positioning during splicing and reduce the difficulty of alignment during on-site construction, but also prevent water from seeping directly downwards at the joint, further improving the waterproof performance of the joint. At the same time, it enhances the vertical shear bearing capacity at the splicing of the floor slab and prevents the floor slab from misaligning under load.

[0049] Both the overlapping protrusion 14 and the overlapping groove 15 have chamfered edges at their upper edges. This chamfering design prevents damage to the edges and corners of the precast floor slab 1 during transportation and hoisting due to collisions. It also guides the overlapping protrusion 14 to slide smoothly into the overlapping groove 15 during splicing, reducing frictional resistance during alignment. At the joint of adjacent precast floor slabs 1, the overlapping protrusion 14 and overlapping groove 15 are fitted with sealant 4. The sealant 4 fills the upper gap of the overlapping area, sealing the opening at the top of the joint and preventing rainwater, dust, and other debris from entering. The sealant also has good elasticity and adhesion, adapting to minor deformations of the floor slab without cracking or peeling due to deformation. Together with the internal flexible waterproof layer 5, it forms a double waterproofing system, enhancing the waterproof reliability of the joint.

[0050] There are gaps between the surfaces where the overlapping protrusion 14 and the overlapping groove 15 meet. The gap between the two vertical surfaces is the transverse stress gap 18, and the gap between the two horizontal surfaces is the longitudinal stress gap 19. These reserved gaps can provide space for the deformation of the floor slab under temperature changes, concrete shrinkage and creep, and load, and avoid the floor slab from generating internal stress due to restricted deformation, which could lead to joint cracking or floor slab damage.

[0051] Both the transverse stress gap 18 and the longitudinal stress gap 19 are provided with rubber sheets 6. The rubber sheets 6 have excellent elasticity and buffering performance. They can fill the gaps to prevent debris from entering, absorb stress through their own compression and rebound when the floor slab deforms, and also play an auxiliary role in sealing and waterproofing.

[0052] A rubber sheet 6 is also provided between the contact surfaces below the grouting gap 17 of two adjacent precast floor slabs 1. The rubber sheet 6 can seal the bottom of the grouting gap 17 before grouting to prevent leakage when injecting flexible waterproof mortar, ensure the fullness and density of grouting, and further enhance the waterproofing ability of the bottom of the joint.

[0053] A grouting hole 16 is provided at the top near the end of the precast floor slab 1, which is connected to the grouting gap 17 between two adjacent precast floor slabs 1. The grouting hole 16 serves as a dedicated channel for grouting construction. It is located at the top of the precast floor slab 1, which facilitates grouting operations above the floor slab and reduces the difficulty of construction. The grouting hole 16 is directly connected to the grouting gap 17, which ensures that the waterproof mortar can be smoothly injected into the grouting gap 17 and the connecting hole connected to it, thus ensuring the smoothness of the grouting process.

[0054] The arc-shaped connecting rod 2 includes a rod body 21, which fits into the arc-shaped connecting hole formed by the connection of the right connecting hole 11 and the left connecting hole 12. The curvature of the rod body 21 is completely consistent with the curvature of the arc-shaped connecting hole, which can ensure that the rod body 21 fits tightly with the hole wall, making the force on the arc-shaped connecting rod 2 more uniform and avoiding local stress concentration. The head of the rod body 21 is provided with a rod head 22 with a diameter larger than that of the right connecting hole 11. The rod head 22 can be locked at the top opening of the right connecting hole 11 to prevent the arc-shaped connecting rod 2 from slipping out of the hole during installation and use. The tail of the rod body 21 is provided with threads, and the threads of the tail of the rod body 21 are fitted with a connecting nut 23. By tightening the connecting nut 23, a preload can be applied to the two adjacent precast floor slabs 1, firmly pulling the two floor slabs together, eliminating the initial gap at the joint, and improving the overall rigidity and integrity of the floor slab. At the same time, this threaded connection method is easy to install and disassemble, and facilitates later maintenance and replacement.

[0055] A washer 24 is provided between the rod head 22 and the connecting nut 23 and the precast floor slab 1. The washer 24 is sleeved on the rod body 21. The washer 24 can increase the contact area between the rod head 22 and the connecting nut 23 and the surface of the precast floor slab 1, and disperse the local pressure of the two on the surface of the floor slab. This prevents the concrete surface of the precast floor slab 1 from being crushed or cracked due to excessive pressure when tightening the connecting nut 23. At the same time, the washer 24 can also play a buffering role. When the floor slab is subjected to vibration load, it reduces the rigid collision between the rod head 22 and the connecting nut 23 and the floor slab, and protects the structural integrity of the floor slab and the connecting rod. In addition, the washer 24 can also fill the small unevenness between the rod head 22, the connecting nut 23 and the surface of the floor slab, making the connection tighter and more secure, and preventing the connecting nut 23 from loosening during use.

[0056] Multiple countersunk holes 13 are provided on the top surface of the precast floor slab 1. The right connecting hole 11 and the left connecting hole 12 are connected to the countersunk holes 13. The rod head 22 and the connecting nut 23 of the arc-shaped connecting rod 2 are both set in the countersunk holes 13. The depth of the countersunk holes 13 is greater than the height of the rod head 22 and the connecting nut 23, which can completely accommodate the rod head 22 and the connecting nut 23 inside the floor slab, preventing them from protruding from the floor slab surface, ensuring the flatness of the top surface of the floor slab, facilitating the construction of the subsequent floor slab surface layer, and not affecting the effect of the floor decoration. At the same time, the countersunk holes 13 can also play a certain role in protecting the rod head 22 and the connecting nut 23, preventing them from being damaged by external impacts, and also preventing people from tripping over the protruding connecting parts when walking on the floor slab, thus improving the safety during the construction process.

[0057] Each countersunk hole 13 is equipped with a hole cover 3, which slides in conjunction with the countersunk hole 13. The upper surface of the hole cover 3 is flush with the upper surface of the precast floor slab 1. The hole cover 3 can completely seal the top opening of the countersunk hole 13, preventing dust, water, and debris from entering the interior of the countersunk hole 13. This also prevents the rod head 22 of the arc-shaped connecting rod 2 and the connecting nut 23 from rusting due to long-term exposure to a humid and impurity-laden environment, effectively extending the service life of the connectors. At the same time, the hole cover 3 is flush with the floor slab surface, further ensuring the flatness and aesthetics of the top surface of the floor slab, without affecting subsequent floor construction and use. It also prevents people from tripping over the countersunk hole 13 when walking on the floor slab, improving safety during construction.

[0058] Example 3

[0059] To further illustrate the above embodiments, a method for connecting prefabricated floor slab side joint structures is also provided, comprising the following steps:

[0060] S1. Rubber sheets 6 are pasted on the side and bottom surfaces of the lap groove 15 at the tail end of each precast floor slab 1, as well as on the mating side at the lower end of the head end of the precast floor slab 1. This completes the pre-setting of the rubber sheets 6, ensuring that there is a transverse stress gap 18 and a longitudinal stress gap 19 between the lap protrusion 14 and the lap groove 15 during the subsequent connection process, and also ensuring the sealing of the grouting gap 17.

[0061] S2. Connect the head end and tail end of the two precast floor slabs 1 so that the right connecting holes 11 and left connecting holes 12 of the two adjacent precast floor slabs 1 are aligned. At the same time, accurately snap the overlapping protrusions 14 into the overlapping grooves 15 to complete the initial positioning of the two floor slabs and ensure that all connecting holes and overlapping parts are accurately aligned, so as to prepare for the subsequent connection construction.

[0062] S3. Place a washer 24 on the rod body 21 of each connecting rod 2, and then insert each connecting rod 2 into the corresponding right connecting hole 11 and the mating left connecting hole 12, so that the rod body 21 of the arc-shaped connecting rod 2 is completely in contact with the inner wall of the arc-shaped connecting hole, and the rod head 22 of the arc-shaped connecting rod 2 remains in the countersunk hole 13 on the corresponding side, ensuring that the arc-shaped connecting rod 2 is installed in place and will not be offset or fall off. The rod head 22 is separated from the precast floor slab 1 by a washer 24.

[0063] S4. Fix each arc-shaped connecting rod 2, put the washer 24 on the tail of the arc-shaped connecting rod 2, and then tighten the connecting nut 23. Apply a uniform pre-tightening force to the two adjacent precast floor slabs 1 through the threaded engagement, firmly pull the two precast floor slabs 1 together, eliminate the initial gap at the joint, and improve the overall integrity of the floor slab. The connecting nut 23 of the arc-shaped connecting rod 2 remains in the countersunk hole 13 on the corresponding side.

[0064] S5. Install hole covers 3 above each countersunk hole 13 to make the upper surface of each precast floor slab 1 a complete plane, preventing workers from tripping over the countersunk hole 13 or protruding connectors during construction, ensuring construction safety, and also preventing the rod head 22 of the arc-shaped connecting rod 2 and the connecting nut 23 from rusting due to long-term exposure to a humid and impurity-laden environment, effectively extending the service life of the connectors.

[0065] S6. Inject flexible waterproof mortar into the grouting gap 17 between two adjacent precast floor slabs 1. After the waterproof mortar is injected through the grouting hole 16, it will enter the grouting gap 17 and flow along the grouting gap 17 to fill all the gaps. At the same time, it will seep into the gap between the connecting hole and the arc-shaped connecting rod 2. After the waterproof mortar solidifies, a continuous and complete flexible waterproof layer 5 will be formed between the two adjacent precast floor slabs 1. This not only achieves reliable waterproofing of the joint, but also provides anchoring and anti-corrosion protection for the arc-shaped connecting rod 2.

[0066] S7. Fill the gaps between the overlapping protrusions 14 and overlapping grooves 15 of the two adjacent precast floor slabs 1 with grease to form grease caulking 4. The grease fills the upper gap of the overlapping position, which can seal the opening at the top of the joint and prevent rainwater, dust and other debris from entering the joint, thereby improving the waterproof reliability of the joint.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast floor slab side joint structure, comprising a precast floor slab (1), characterized in that: Multiple right connecting holes (11) are provided on the end face of the head end of the precast floor slab (1) and multiple left connecting holes (12) are provided on the end face of the tail end of the precast floor slab (1) and the head end and tail end of two adjacent precast floor slabs (1) are connected, and the right connecting holes (11) and left connecting holes (12) of two adjacent precast floor slabs (1) are connected to each other, forming a complete arc-shaped connecting hole. Also includes: Arc-shaped connecting rod (2) is set in the right connecting hole (11) and left connecting hole (12) connecting two adjacent precast floor slabs (1); The flexible waterproof layer (5) has a grouting gap (17) between the joint surfaces of two adjacent precast floor slabs (1). Flexible waterproof mortar is injected into the grouting gap (17) to form the flexible waterproof layer (5). The grouting gap (17) is connected to the right connecting hole (11) and the left connecting hole (12).

2. The prefabricated floor slab side joint structure according to claim 1, characterized in that: The precast floor slab (1) has an overlapping protrusion (14) on the upper part of the end face of the head end and an overlapping groove (15) on the upper part of the end face of the tail end. The head ends and tail ends of two adjacent precast floor slabs (1) are connected by the overlapping protrusion (14) into the overlapping groove (15).

3. The prefabricated floor slab side joint structure according to claim 2, characterized in that: The upper edge of the overlapping protrusion (14) and the overlapping groove (15) are both chamfered, and the upper joint of the overlapping protrusion (14) and the overlapping groove (15) of two adjacent precast floor slabs (1) is provided with caulking compound (4).

4. The prefabricated floor slab side joint structure according to claim 3, characterized in that: There is a gap between the surfaces where the overlapping protrusion (14) and the overlapping groove (15) meet. The gap between the two vertical surfaces is the transverse stress gap (18), and the gap between the two horizontal surfaces is the longitudinal stress gap (19). A rubber sheet (6) is provided in both the transverse stress gap (18) and the longitudinal stress gap (19). A rubber sheet (6) is also provided between the contact surfaces below the grouting gap (17) of two adjacent precast floor slabs (1).

5. The prefabricated floor slab side joint structure according to claim 1, characterized in that: The precast floor slab (1) has a grouting hole (16) at the top near the head end, which is connected to the grouting gap (17) between the two adjacent precast floor slabs (1).

6. The prefabricated floor slab side joint structure according to claim 1, characterized in that: The arc-shaped connecting rod (2) includes a rod body (21). The rod body (21) is in contact with the wall of the arc-shaped connecting hole formed by the connection between the right connecting hole (11) and the left connecting hole (12). The head of the rod body (21) is provided with a rod head (22) with a diameter larger than that of the right connecting hole (11). The tail of the rod body (21) is provided with a thread, and the thread at the tail of the rod body (21) is fitted with a connecting nut (23).

7. The prefabricated floor slab side joint structure according to claim 6, characterized in that: A gasket (24) is provided between the rod head (22) and the connecting nut (23) and the precast floor slab (1), and the gasket (24) is sleeved on the rod body (21).

8. The prefabricated floor slab side joint structure according to claim 7, characterized in that: The precast floor slab (1) has multiple countersunk holes (13) on its top surface. The right connecting hole (11) and the left connecting hole (12) are connected to the countersunk holes (13). The rod head (22) and the connecting nut (23) of the arc-shaped connecting rod (2) are both set in the countersunk holes (13).

9. A prefabricated floor slab side joint structure according to claim 8, characterized in that: Each of the countersunk holes (13) is provided with a hole cover (3), which is fitted into the top opening of the countersunk hole (13). The upper surface of the hole cover (3) is flush with the upper surface of the precast floor slab (1).

10. A method for connecting the side joint structure of a prefabricated floor slab, characterized in that, Includes the following steps: S1. Rubber sheets (6) are pasted on the side and bottom of the lap groove (15) at the tail end of each precast floor slab (1) and on the mating side at the lower end of the head end of the precast floor slab (1). S2. Connect the head end and tail end of the two precast floor slabs (1), and align the right connecting holes (11) and left connecting holes (12) of the two adjacent precast floor slabs (1), and snap the overlapping protrusions (14) into the overlapping grooves (15). S3. Place a washer (24) on the rod body (21) of each connecting rod (2), insert each connecting rod (2) into the corresponding right connecting hole (11) and the mating left connecting hole (12), and leave the rod head (22) of the arc-shaped connecting rod (2) in the countersunk hole (13) on the corresponding side. S4. Put a washer (24) on the tail of the arc-shaped connecting rod (2) and tighten the connecting nut (23). The connecting nut (23) of the arc-shaped connecting rod (2) remains in the countersunk hole (13) on the corresponding side. S5. Install hole caps (3) above each countersunk hole (13); S6. Flexible waterproof mortar is injected into the grouting gap (17) between two adjacent precast floor slabs (1) through the grouting hole (16). The flexible waterproof mortar enters the grouting gap (17), flows along the grouting gap (17) and fills all the gaps. At the same time, it seeps into the gap between the connecting hole and the arc-shaped connecting rod (2). After the waterproof mortar solidifies, a flexible waterproof layer (5) is formed. S7. Fill the gaps between the overlapping protrusions (14) and overlapping grooves (15) of the two adjacent precast floor slabs (1) with grease to form grease caulking (4).

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