A connection structure and construction method for low-rise prefabricated concrete floor slabs

Abstract

This invention relates to the field of building technology and discloses a connection structure and construction method for low-rise prefabricated concrete floor slabs. The structure includes several floor slabs, with a connection mechanism between adjacent slabs. Each connection mechanism includes a T-shaped cover plate and two L-shaped plates. The T-shaped cover plate includes a top plate and a central web plate. The L-shaped plates have several second mating holes, which are elongated holes extending vertically along the L-shaped plate. A wedge-shaped locking block is provided between the central web plate and the L-shaped plate, and the wedge-shaped locking block has a first through hole for a transverse bolt to pass through. This technical solution, by setting the second mating holes as elongated holes extending vertically, provides vertical adjustment margin for the transverse bolts during installation, significantly reducing the requirements for component processing accuracy and on-site installation accuracy, and improving construction tolerance.

Description

Technical Field

[0001] This invention relates to the field of building technology, specifically to a connection structure and construction method for a low-rise prefabricated concrete floor slab. Background Technology

[0002] Prefabricated steel structure buildings offer advantages such as rapid construction, factory-produced components, and environmental friendliness, making them an important direction for the development of my country's construction industrialization. Currently, prefabricated steel structure floor systems mostly utilize precast composite slabs. Construction requires on-site support and formwork, followed by the hoisting of the precast base slab and subsequent large-area post-cast layer construction. This results in significant on-site wet work, complex procedures, and increased slab thickness, which contradicts the design philosophy of efficient prefabricated building construction.

[0003] To address the aforementioned issues, existing technologies have proposed several dry-bolt connection floor slab construction schemes. For example, a fully prefabricated floor slab utilizes a T-shaped cover plate in conjunction with precast dagger-shaped beams, using horizontal and vertical bolts to connect and fix the precast floor slabs to the steel beams and columns. This technical solution employs dry-bolt connections, achieving fully prefabricated construction of the floor slab system; the precast floor slabs can be reliably connected to the steel beams without the need for supports. In specific construction, the precast dagger-shaped beams and structural steel columns are first positioned and installed, then the precast floor slabs are aligned and installed, and finally the T-shaped cover plate is installed. After installation, a secondary calibration is performed, and then all bolts are tightened sequentially to complete the fixing.

[0004] However, the aforementioned existing technologies still have the following shortcomings:

[0005] 1. Limited tolerance adjustment capability: The bolt connection holes in the existing scheme are all round holes. The positioning accuracy of the components is required during the installation process. Any positioning deviation of the components may affect the subsequent installation, resulting in poor construction fault tolerance.

[0006] 2. Insufficient anti-loosening measures: The existing solution relies solely on bolt preload to achieve connection and fixation. Under long-term use and vibration loads, the bolts are at risk of loosening, affecting structural safety.

[0007] 3. Lack of optimized design for low-rise buildings: Existing technologies are mainly geared towards high-rise or large buildings, and the design of component dimensions and connection nodes does not fully consider the characteristics of low-rise buildings, such as smaller loads, limited construction conditions, and tight schedules. Summary of the Invention

[0008] This invention provides a connection structure and construction method for a low-rise prefabricated concrete floor slab, which solves the problems mentioned in the background art.

[0009] This invention provides the following technical solution: a connection structure for a low-rise prefabricated concrete floor slab, comprising several floor slabs, with a connection mechanism between adjacent floor slabs. Each connection mechanism includes a T-shaped cover plate and two L-shaped plates. The T-shaped cover plate includes a top plate and a central web plate. Several first mating holes are evenly distributed through the central web plate. A horizontal plate is fixed on the L-shaped plate. The floor slab is sandwiched between the top plate and the horizontal plate. The top plate, the horizontal plate, and the floor slab are fixedly connected by vertical bolts. Several second mating holes are provided on the L-shaped plate. The second mating holes are elongated holes extending vertically along the L-shaped plate. A wedge-shaped locking block is provided between the central web plate and the L-shaped plate. The wedge-shaped locking block has a first through hole for a transverse bolt to pass through. The outer wall of the wedge-shaped locking block has a wedge-shaped guide surface. The inner side of the L-shaped plate has a locking groove that matches the wedge-shaped guide surface.

[0010] The central web plate is sandwiched between the two L-shaped plates, and the transverse bolt passes through the second mating hole, the first through hole of the wedge-shaped locking block, and the first mating hole to fix the central web plate, the wedge-shaped locking block, and the L-shaped plates together.

[0011] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, the vertical length of the elongated hole is 1.5 to 2.5 times the diameter of the transverse bolt, and the width is adapted to the diameter of the transverse bolt.

[0012] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, the inclination angle of the wedge-shaped guide surface of the wedge-shaped locking block is 30° to 60°, the inclination angle of the locking groove is the same as that of the wedge-shaped guide surface, and the wedge-shaped locking block has the degree of freedom to move along the wedge-shaped guide surface into the locking groove when the transverse bolt is tightened, thus forming a mechanical interlock.

[0013] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, a rubber sealing gasket layer is provided between the top slab and the upper end surface of the floor slab, the thickness of the rubber sealing gasket layer being 5mm to 10mm, and a thermal insulation gasket layer is provided between the horizontal slab and the lower end surface of the floor slab, the thickness of the thermal insulation gasket layer being 5mm to 10mm.

[0014] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, the top slab, the rubber sealing gasket layer, the floor slab, the thermal insulation gasket layer, and the horizontal plate are all provided with assembly holes for the vertical bolts to pass through.

[0015] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, the floor slab is elastically provided with insert columns, the L-shaped plate is provided with a second through hole, the central web plate is provided with an insertion hole, the end of the insert column is fixed with an abutting wedge, and when the vertical bolt is inserted into the assembly hole inside the floor slab, it abuts against the abutting wedge, causing the insert column to pass through the second through hole and be inserted into the insertion hole, thus forming an auxiliary locking.

[0016] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, a spring is provided between the anti-collision inclined block and the inner wall of the floor slab.

[0017] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, a number of reinforcing ribs are evenly distributed between the bottom of the horizontal plate and the L-shaped plate, and positioning blocks for fixing to the external structure are fixed on both sides of the horizontal plate and the L-shaped plate.

[0018] As an optional solution for the connection structure of the low-rise prefabricated concrete floor slab described in this invention, the bottom sides of the central web are provided with guide slopes, and the top of the L-shaped plate is provided with a chamfer that matches the guide slopes.

[0019] A construction method for low-rise prefabricated concrete floor slabs includes the following steps:

[0020] S1. Install the two L-shaped plates onto the structural support respectively, leaving an installation gap between the two L-shaped plates;

[0021] S2. Place the insulation pad on the horizontal board, and then hoist the floor slab onto the insulation pad;

[0022] S3. Insert the T-shaped cover plate from above into the installation gap between the two L-shaped plates, so that the central web plate is located between the two L-shaped plates;

[0023] S4. Place the wedge-shaped locking block between the L-shaped plate and the central web plate, so that the first through hole of the wedge-shaped locking block is aligned with the elongated hole of the second mating hole and the first mating hole;

[0024] S5. Insert the transverse bolt, passing through the elongated hole on the L-shaped plate, the first through hole of the wedge-shaped locking block, and the first mating hole on the central web plate, to initially fix it, without fully tightening the transverse bolt;

[0025] S6. Lay a rubber sealing gasket between the floor slab and the roof slab, and vertically adjust and calibrate the relative positions of the T-shaped cover plate and the L-shaped plate through the elongated hole to ensure precise alignment of the structure, and then tighten the horizontal bolts.

[0026] S7. When the transverse bolts are tightened, the two L-shaped plates clamp the central web plate. During this process, the wedge-shaped locking block moves along the wedge-shaped guide surface into the lock groove and is squeezed into the lock groove to form a mechanical interlock.

[0027] S8. Allow the vertical bolts to pass through the assembly holes opened in the top plate, rubber sealing gasket, floor slab, insulation gasket, and horizontal plate;

[0028] S9. When the vertical bolt is inserted into the assembly hole, the pressing and resisting block is pressed, causing the pressing and resisting block to move the insert horizontally, so that the insert passes through the second through hole and is inserted into the insertion hole, forming an auxiliary locking;

[0029] S10. Tighten the vertical bolts to complete the fixing.

[0030] The present invention has the following beneficial effects:

[0031] 1. The connection structure and construction method of the low-rise prefabricated concrete floor slab, by setting the second butt hole on the L-shaped plate as an elongated oval hole extending in the vertical direction, replaces the round hole in the existing technology, so that the horizontal bolts have vertical adjustment margin during installation, and allow the relative position between the T-shaped cover plate and the L-shaped plate to be finely adjusted, which significantly reduces the requirements for component processing accuracy and on-site installation accuracy, and improves construction tolerance.

[0032] 2. The connection structure and construction method of this low-rise prefabricated concrete floor slab include the addition of wedge-shaped locking blocks at the transverse bolt connections. During bolt tightening, the wedge-shaped locking blocks are synchronously driven to engage with the locking grooves, forming a mechanical interlock. This structure adds a physical locking barrier in addition to the bolt preload, ensuring the reliability and safety of the connection nodes even if the bolts loosen under long-term use or vibration loads.

[0033] 3. The connection structure and construction method of the low-rise prefabricated concrete floor slab: when the vertical bolts are tightened, the bottom end of the vertical bolts will squeeze the anti-adhesive block, causing the anti-adhesive block to drive the insertion column to move, so that the insertion column passes through the second through hole and is inserted into the insertion hole, forming an auxiliary lock, thereby further improving the stability of the connection between the T-shaped cover plate, L-shaped plate and floor slab, making the safety higher.

[0034] 4. The connection structure and construction method of this low-rise prefabricated concrete floor slab are optimized based on the mature T-shaped cover plate + L-shaped plate dry bolt connection system. The components have regular shapes, which are suitable for standardized mass production in the factory and the cost is controllable. At the same time, the use of dry construction eliminates the need for on-site pouring and curing, resulting in fast construction speed. It is particularly suitable for the construction period requirements and conditions of low-rise prefabricated buildings. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0036] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0037] Figure 3 This is a schematic diagram of the connecting mechanism in this invention.

[0038] Figure 4 For the present invention Figure 3 A structural diagram from another perspective.

[0039] Figure 5 This is a cross-sectional view of the connection between the floor slab and the connecting mechanism in this invention.

[0040] Figure 6 For the present invention Figure 5 Enlarged view of section B in the middle.

[0041] Figure 7 In this invention Figure 6 A partial structural breakdown diagram.

[0042] Figure 8 For the present invention Figure 5 Enlarged view of point C in the middle.

[0043] In the diagram: 1. Floor slab; 2. Connecting mechanism; 201. T-shaped cover plate; 2011. Top plate; 2012. Central web plate; 2013. First mating hole; 202. L-shaped plate; 3. Horizontal plate; 4. Vertical bolt; 5. Second mating hole; 6. Wedge-shaped locking block; 7. Horizontal bolt; 8. First through hole; 9. Wedge-shaped guide surface; 10. Locking groove; 11. Rubber sealing gasket; 12. Thermal insulation gasket; 13. Assembly hole; 14. Insert column; 15. Second through hole; 16. Insertion hole; 17. Abutting wedge block; 18. Spring; 19. Reinforcing rib; 20. Positioning block; 21. Guide wedge surface; 22. Chamfer. Detailed Implementation

[0044] 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.

[0045] Example 1, please refer to Figures 1-8A connection structure for a low-rise prefabricated concrete floor slab includes several floor slabs 1, with a connection mechanism 2 between adjacent floor slabs 1. Each connection mechanism 2 includes a T-shaped cover plate 201 and two L-shaped plates 202. The T-shaped cover plate 201 includes a top plate 2011 and a central web plate 2012. Several first mating holes 2013 are evenly distributed through the central web plate 2012. A horizontal plate 3 is fixed on the L-shaped plate 202. The floor slabs 1 are sandwiched between the top plate 2011 and the horizontal plate 3. 11. The horizontal plate 3 and the floor slab 1 are fixedly connected by vertical bolts 4. The L-shaped plate 202 is provided with several second mating holes 5. The second mating holes 5 are elongated holes extending in the vertical direction of the L-shaped plate 202. A wedge-shaped locking block 6 is provided between the central web plate 2012 and the L-shaped plate 202. The wedge-shaped locking block 6 is provided with a first through hole 8 for the transverse bolt 7 to pass through. The outer wall of the wedge-shaped locking block 6 is provided with a wedge-shaped guide surface 9. The inner side of the L-shaped plate 202 is pre-set with a locking groove 10 that matches the wedge-shaped guide surface 9.

[0046] The central web plate 2012 is sandwiched between two L-shaped plates 202. The transverse bolt 7 passes through the second mating hole 5, the first through hole 8 of the wedge-shaped locking block 6 and the first mating hole 2013 to fix the central web plate 2012, the wedge-shaped locking block 6 and the L-shaped plate 202.

[0047] The vertical length of the oblong hole is 1.5 to 2.5 times the diameter of the transverse bolt 7, and the width is adapted to the diameter of the transverse bolt 7;

[0048] The wedge-shaped guide surface 9 of the wedge-shaped locking block 6 has an inclination angle of 30° to 60°. The inclination angle of the locking groove 10 is the same as that of the wedge-shaped guide surface 9. The wedge-shaped locking block 6 has the freedom to move along the wedge-shaped guide surface 9 into the locking groove 10 when the transverse bolt 7 is tightened, thus forming a mechanical interlock.

[0049] The key improvement in this technical solution is that the second mating hole 5 is an elongated oval hole extending vertically, with a vertical length of 1.5 to 2.5 times the diameter of the transverse bolt 7 and a width that matches the diameter of the transverse bolt 7, so that the transverse bolt 7 has a vertical adjustment margin during installation.

[0050] In the installed state, when the transverse bolt 7 is tightened, the two L-shaped plates clamp the central web plate 2012, causing the wedge-shaped locking block 6 to move along the wedge-shaped guide surface 9 into the locking groove 10 and be squeezed into the locking groove 10 to form a mechanical interlock. This structure adds a physical locking defense line in addition to the bolt preload. Even if the bolts loosen under long-term use or vibration load, the interlock structure can still maintain the reliability and safety of the connection node.

[0051] In this technical solution, a rubber sealing gasket 11 is provided between the top plate 2011 and the upper end face of the floor slab 1. The thickness of the rubber sealing gasket 11 is 5mm to 10mm. A thermal insulation gasket 12 is provided between the horizontal plate 3 and the lower end face of the floor slab 1. The thickness of the thermal insulation gasket 12 is 5mm to 10mm. The rubber sealing gasket 11 can absorb vibration energy while sealing, and the thermal insulation gasket 12 can absorb vibration energy while absorbing heat for insulation.

[0052] Several reinforcing ribs 19 are evenly distributed between the bottom of the horizontal plate 3 and the L-shaped plate 202, and positioning blocks 20 for fixing to the external structural support are fixed on both sides of the horizontal plate 3 and the L-shaped plate 202. The reinforcing ribs 19 enhance the overall rigidity and stability of the L-shaped plate 202, and the positioning blocks 20 have several positioning holes to facilitate fixed connection with the external structural support.

[0053] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1-8 Assembly holes 13 for vertical bolts 4 to pass through are provided on the top plate 2011, rubber sealing gasket layer 11, floor slab 1, thermal insulation gasket layer 12 and horizontal plate 3.

[0054] The floor slab 1 is internally elastically provided with a column 14, the L-shaped plate 202 is provided with a second through hole 15, the central web plate 2012 is provided with a hole 16, the end of the column 14 is fixed with an abutting wedge 17, when the vertical bolt 4 is inserted into the assembly hole 13 inside the floor slab 1, it abuts against the abutting wedge 17, causing the column 14 to pass through the second through hole 15 and be inserted into the hole 16, forming an auxiliary locking;

[0055] A spring 18 is provided between the anti-slip block 17 and the inner wall of the floor slab 1. The spring 18 is a compression spring, with one end abutting against the anti-slip block 17 and the other end abutting against the inner wall of the floor slab 1. When the vertical bolt 4 is inserted, the anti-slip block 17 compresses the spring 18. When the vertical bolt 4 is removed, the spring 18 drives the anti-slip block 17 to reset.

[0056] In this technical solution, such as Figure 8 As shown, the insert 14 is horizontally positioned inside the floor slab 1, with the inclined surface of the contact block 17 facing upwards. The insert 14, the second through hole 15, and the insertion hole 16 are coaxially arranged, with the axis perpendicular to the surface of the central web 2012. When the vertical bolt 4 is inserted into the assembly hole 13, the bottom end of the vertical bolt 4 will press against the contact block 17, causing the contact block 17 to slide to the left. At the same time, the spring 18 is compressed, causing the spring 18 to store force. The sliding of the contact block 17 to the left drives the insert 14 to move to the left, so that the insert 14 passes through the second through hole 15 and is inserted into the insertion hole 16, forming an auxiliary lock, thereby further improving the stability of the connection between the T-shaped cover plate 201, the L-shaped plate 202, and the floor slab 1.

[0057] In this technical solution, guide slopes 21 are provided on both sides of the bottom of the central web plate 2012, and chamfers 22 that cooperate with the guide slopes 21 are provided on the top of the L-shaped plate 202. The chamfers 22 guide the guide slopes 21, so that the installation of the T-shaped cover plate 201 does not require precise manual alignment, realizing "blind insertion" installation and increasing the convenience of installation.

[0058] Example 3 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1-8 A construction method for a low-rise prefabricated concrete floor slab 1, characterized by the following steps:

[0059] S1. Install the two L-shaped plates 202 onto the structural support respectively, leaving an installation gap between the two L-shaped plates 202;

[0060] S2. Place the insulation pad 12 onto the horizontal plate 3, and then hoist the floor slab 1 onto the insulation pad 12;

[0061] S3. Insert the T-shaped cover plate 201 from above into the installation gap between the two L-shaped plates 202, so that the central web plate 2012 is located between the two L-shaped plates 202;

[0062] S4. Place the wedge-shaped locking block 6 between the L-shaped plate 202 and the central web plate 2012, so that the first through hole 8 of the wedge-shaped locking block 6 is aligned with the elongated hole of the second mating hole 5 and the first mating hole 2013;

[0063] S5. Insert the transverse bolt 7 through the elongated hole on the L-shaped plate 202, the first through hole 8 of the wedge-shaped locking block 6, and the first mating hole 2013 on the central web plate 2012 to initially fix it, but do not fully tighten the transverse bolt 7.

[0064] S6. Lay a rubber sealing gasket 11 between the floor slab 1 and the top slab 2011, and vertically adjust and calibrate the relative positions of the T-shaped cover plate 201 and the L-shaped plate 202 through the elongated hole to make the structure accurately aligned, and then tighten the horizontal bolts 7.

[0065] S7. When the transverse bolt 7 is tightened, the two L-shaped plates clamp the central web plate 2012. During this process, the wedge-shaped locking block 6 moves along the wedge-shaped guide surface 9 into the locking groove 10 and is squeezed into the locking groove 10 to form a mechanical interlock.

[0066] S8. The vertical bolt 4 passes through the assembly holes 13 opened on the top plate 2011, the rubber sealing gasket 11, the floor slab 1, the thermal insulation gasket 12 and the horizontal plate 3;

[0067] S9. When the vertical bolt 4 is inserted into the assembly hole 13, the pressing and resisting block 17 is pressed, causing the pressing and resisting block 17 to drive the insert 14 to move horizontally, so that the insert 14 passes through the second through hole 15 and is inserted into the insertion hole 16, forming an auxiliary lock.

[0068] S10. Tighten vertical bolt 4 to complete the fixing.

[0069] In this technical solution, the elongated hole on the L-shaped plate 202 allows for vertical fine-tuning of the T-shaped cover plate 201 and the L-shaped plate 202 within a range of ±5mm to ±10mm after the transverse bolts 7 are initially fixed. This means that only "rough alignment" is required during hoisting, and subsequent "fine-tuning" is achieved by moving the bolts within the elongated hole, greatly reducing the difficulty of hoisting and the processing accuracy requirements of the component factory. At the same time, when tightening the transverse bolts 7, the two L-shaped plates clamp the central web plate 2012, while simultaneously pushing the wedge-shaped locking block 6 to move and embed it into the locking groove 10 to form a physical and mechanical interlock. This action combines "tightening" and "locking" into one. Traditional methods rely entirely on bolt preload (friction) to prevent loosening, which is prone to failure under vibration. Even if the bolt preload decreases due to vibration or creep after long-term use, the rigid jamming of the wedge-shaped locking block 6 and the locking groove 10 can still ensure that the connection node does not come apart, greatly improving the structural safety redundancy of low-rise buildings under horizontal loads such as earthquakes.

[0070] In addition, when the vertical bolt 4 is tightened, the pressure of the anti-adhesive block 17 causes the anti-adhesive block 17 to drive the insertion post 14 to move horizontally, so that the insertion post 14 passes through the second through hole 15 and is inserted into the insertion hole 16, forming an auxiliary lock, which further improves the stability of the connection between the T-shaped cover plate 201, the L-shaped plate 202 and the floor slab 1, and the connection effect is better.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A connection structure for a low-rise prefabricated concrete floor slab, comprising several floor slabs (1), with a connection mechanism (2) between adjacent floor slabs (1), each connection mechanism (2) comprising a T-shaped cover plate (201) and two L-shaped plates (202), the T-shaped cover plate (201) comprising a top plate (2011) and a central web plate (2012), the central web plate (2012) having several first connecting holes (2013) evenly distributed through it, a horizontal plate (3) fixed on the L-shaped plate (202), the floor slab (1) being sandwiched between the top plate (2011) and the horizontal plate (3), the top plate (2011), the horizontal plate (3) and the floor slab (1) being fixedly connected by vertical bolts (4), characterized in that: The L-shaped plate (202) is provided with a plurality of second mating holes (5), the second mating holes (5) being elongated holes extending vertically along the L-shaped plate (202). A wedge-shaped locking block (6) is provided between the central web plate (2012) and the L-shaped plate (202). The wedge-shaped locking block (6) is provided with a first through hole (8) for a transverse bolt (7) to pass through. The outer side wall of the wedge-shaped locking block (6) is provided with a wedge-shaped guide surface (9). The inner side of the L-shaped plate (202) is provided with a locking groove (10) that matches the wedge-shaped guide surface (9). The central web plate (2012) is sandwiched between the two L-shaped plates (202). The transverse bolt (7) passes through the second mating hole (5), the first through hole (8) of the wedge locking block (6) and the first mating hole (2013) to fix the central web plate (2012), the wedge locking block (6) and the L-shaped plate (202) together.

2. The connection structure of the low-rise prefabricated concrete floor slab according to claim 1, characterized in that: The vertical length of the elongated hole is 1.5 to 2.5 times the diameter of the transverse bolt (7), and the width is adapted to the diameter of the transverse bolt (7).

3. The connection structure of the low-rise prefabricated concrete floor slab according to claim 2, characterized in that: The wedge-shaped guide surface (9) of the wedge-shaped locking block (6) has an inclination angle of 30° to 60°. The inclination angle of the locking groove (10) is the same as that of the wedge-shaped guide surface (9). The wedge-shaped locking block (6) has the freedom to move along the wedge-shaped guide surface (9) into the locking groove (10) when the transverse bolt (7) is tightened, thus forming a mechanical interlock.

4. The connection structure of the low-rise prefabricated concrete floor slab according to claim 3, characterized in that: A rubber sealing gasket (11) is provided between the top plate (2011) and the upper surface of the floor slab (1), the rubber sealing gasket (11) having a thickness of 5mm to 10mm. A thermal insulation gasket (12) is provided between the horizontal plate (3) and the lower surface of the floor slab (1), the thermal insulation gasket (12) having a thickness of 5mm to 10mm.

5. The connection structure of the low-rise prefabricated concrete floor slab according to claim 4, characterized in that: The top plate (2011), the rubber sealing gasket layer (11), the floor slab (1), the thermal insulation gasket layer (12), and the horizontal plate (3) are all provided with assembly holes (13) for the vertical bolts (4) to pass through.

6. The connection structure of the low-rise prefabricated concrete floor slab according to claim 5, characterized in that: The floor slab (1) is elastically provided with a column (14), the L-shaped plate (202) is provided with a second through hole (15), the central web plate (2012) is provided with a socket (16), the end of the column (14) is fixed with an abutting wedge (17), when the vertical bolt (4) is inserted into the assembly hole (13) inside the floor slab (1), it abuts against the abutting wedge (17), causing the column (14) to pass through the second through hole (15) and insert into the socket (16), forming an auxiliary locking.

7. The connection structure of the low-rise prefabricated concrete floor slab according to claim 6, characterized in that: A spring (18) is provided between the anti-collision inclined block (17) and the inner wall of the floor slab (1).

8. The connection structure of the low-rise prefabricated concrete floor slab according to claim 7, characterized in that: A number of reinforcing ribs (19) are evenly distributed between the bottom of the horizontal plate (3) and the L-shaped plate (202), and positioning blocks (20) for supporting and fixing to the external structure are fixed on both sides of the horizontal plate (3) and the L-shaped plate (202).

9. The connection structure of the low-rise prefabricated concrete floor slab according to claim 8, characterized in that: The central web (2012) has guide slopes (21) on both sides of its bottom, and the top of the L-shaped plate (202) has a chamfer (22) that matches the guide slopes (21).

10. A construction method for a low-rise prefabricated concrete floor slab, comprising the connection structure of the low-rise prefabricated concrete floor slab according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Install the two L-shaped plates (202) onto the structural support respectively, leaving an installation gap between the two L-shaped plates (202); S2. Place the insulation pad (12) on the horizontal plate (3), and then hoist the floor slab (1) onto the insulation pad (12); S3. Insert the T-shaped cover plate (201) from above into the installation gap between the two L-shaped plates (202) so that the central web plate (2012) is located between the two L-shaped plates (202); S4. Place the wedge-shaped locking block (6) between the L-shaped plate (202) and the central web plate (2012) so that the first through hole (8) of the wedge-shaped locking block (6) is aligned with the elongated hole of the second mating hole (5) and the first mating hole (2013); S5. Insert the transverse bolt (7), pass through the elongated hole on the L-shaped plate (202), the first through hole (8) of the wedge-shaped locking block (6) and the first mating hole (2013) on the central web plate (2012), and initially fix it, without fully tightening the transverse bolt (7); S6. Lay a rubber sealing gasket (11) between the floor slab (1) and the top slab (2011), and vertically adjust and calibrate the relative positions of the T-shaped cover plate (201) and the L-shaped plate (202) through the elongated hole to make the structure accurately aligned, and then tighten the horizontal bolts (7). S7. When the transverse bolt (7) is tightened, the two L-shaped plates (202) clamp the central web plate (2012). During this process, the wedge-shaped locking block (6) moves along the wedge-shaped guide surface (9) into the locking groove (10) and is squeezed into the locking groove (10) to form a mechanical interlock. S8. Make the vertical bolt (4) pass through the assembly holes (13) opened on the top plate (2011), rubber sealing gasket layer (11), floor slab (1), thermal insulation gasket layer (12) and horizontal plate (3); S9. When the vertical bolt (4) is inserted into the assembly hole (13), the pressing of the anti-adhesive block (17) causes the anti-adhesive block (17) to drive the insert (14) to move horizontally, so that the insert (14) passes through the second through hole (15) and is inserted into the insert hole (16) to form an auxiliary lock. S10. Tighten the vertical bolts (4) to complete the fixing.

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