Floor bolt hole sleeve

Abstract

The utility model belongs to building construction technical field, concretely relates to a floor reserved bolt hole mouth sleeve, including sleeve body, the positioning and fixing component for positioning and fixing sleeve body in floor bottom formwork, sleeve body is the cavity structure of both ends open mouth, sleeve body whole presents the circular conical platform structure of narrow upper end, wide lower end, the outer wall of sleeve body is continuously provided with multiple annular step side walls along the axial direction, the lower end inner wall of sleeve body is equipped with a plurality of connecting sockets, positioning and fixing component includes anti -infiltration positioning base and fixed fastener, the upper surface of anti -infiltration positioning base is provided with sleeve positioning key corresponding with connecting socket, sleeve positioning key is embedded in connecting socket, a plurality of symmetrically arranged reserved fixed holes are seted up on the anti -infiltration positioning base, and fixed fastener is passed in the reserved fixed hole. The device can solve the problems of poor positioning accuracy of traditional sleeve, easy displacement and floating of pouring, and prominent leakage hazards.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a sleeve for pre-reserved bolt holes in floor slabs. Background Technology

[0002] In the construction of cast-in-place floor slabs in building engineering, bolt holes of corresponding specifications need to be reserved in advance during the slab pouring process to meet the installation requirements of subsequent climbing scaffolds, construction hoists, electromechanical equipment installation, and pipeline fixing. The accuracy of the reserved bolt hole's forming position, structural integrity, construction efficiency, and subsequent seepage prevention performance directly affect the quality and progress of subsequent equipment installation, making it one of the key procedures in floor slab construction. Currently, the reserved bolt holes in cast-in-place floor slabs are mostly constructed using PVC plastic sleeves for pre-embedding, wooden formwork assembly for sealing, or simple steel straight sleeves. These solutions generally have the following technical defects: First, insufficient positioning accuracy, prone to displacement and deviation. Conventional sleeves lack a reliable bottom rigid fixing structure and are only temporarily tied to the floor slab reinforcement for positioning. During concrete pouring and vibration, they are easily affected by impact forces and buoyancy, causing displacement, floating, or tilting, resulting in the hole's forming position deviating from the design requirements. Subsequent secondary hole enlargement and repair are required, which not only increases construction costs but also damages the overall structural integrity of the floor slab. Second, poor anti-loosening effect, prominent leakage risk. Conventional sleeves have a smooth, curved outer wall, resulting in insufficient adhesion and axial friction with concrete, making them prone to loosening and displacement during concrete setting. Furthermore, the smooth contact surface easily forms through-holes for water seepage, making subsequent sealing difficult and prone to ensuring tightness, leading to floor slab leaks and high maintenance costs. Third, disassembly is difficult and can easily cause structural damage. Conventional straight sleeves have a large contact area with concrete and strong adhesion, making disassembly difficult. Forced disassembly can cause concrete cracking at the opening edges and even damage to the reinforcing steel in the floor slab. Fourth, they have poor durability, high construction costs, and low efficiency. Conventional PVC sleeves and wooden molds have low strength and are mostly for single use, unable to be reused. Additionally, wooden molds require on-site customization and assembly, a cumbersome process that prevents standardized and rapid construction, resulting in low construction efficiency.

[0003] Chinese patent CN202658890U discloses a conical sleeve for pre-drilled holes. The sleeve is molded from plastic or PVC material and is shaped like a truncated cone with open ends. The upper opening is larger than the lower opening. A reinforcing flange is provided at the top of the outer side of the upper opening. At least two sets of dual-purpose holes are formed on the cylinder wall below the reinforcing flange, with two holes in each set symmetrically arranged along the cylinder wall. This patent utilizes a conical structure design with a larger upper portion and a smaller lower portion. During demolding, the sleeve can be pulled upwards through the dual-purpose holes. The smooth outer wall and the diameter difference between the smaller lower portion and the larger upper portion reduce friction with the inner wall of the hole, thus preventing damage to the edge of the pre-drilled hole to some extent. Simultaneously, the conical structure allows for three-dimensional stacking, reducing the footprint on site. The overall structure is simple, the manufacturing cost is low, and it can be mass-produced using plastic molding, offering certain construction convenience. However, the casting stability of this patent is poor. The sleeve has no bottom rigid positioning and fixing structure and only relies on the two-purpose hole on the upper part of the sleeve wall to achieve single-point limiting. During the concrete pouring and high-frequency vibration process, it is very susceptible to lateral impact force and concrete buoyancy, resulting in horizontal displacement, axis tilting and vertical floating. Ultimately, the position and verticality deviation of the formed opening seriously exceed the standard, which cannot meet the requirements of high-precision construction. Utility Model Content

[0004] The purpose of this utility model is to provide a sleeve for pre-reserved bolt holes in floor slabs, which can solve the problems of poor positioning accuracy, easy displacement and floating during pouring, easy damage during disassembly, prominent leakage risks, and poor durability of traditional sleeves, thereby improving the structural stability of the holes.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A pre-reserved bolt hole sleeve for floor slabs includes a sleeve body and a positioning and fixing assembly for positioning and fixing the sleeve body to the bottom template of the floor slab. The sleeve body is a cavity structure with open ends. The sleeve body is generally a frustum-shaped structure with a narrow upper end and a wide lower end. The outer wall of the sleeve body is continuously provided with multiple annular stepped sidewalls sloping towards the lower end of the sleeve body along the axial direction. The lower inner wall of the sleeve body is provided with several symmetrically arranged connecting slots. The positioning and fixing assembly includes a seepage-proof positioning base and a fixing fastener. The upper surface of the seepage-proof positioning base is provided with a sleeve positioning key that corresponds to one of the connecting slots. The sleeve positioning key is embedded in the connecting slot. The seepage-proof positioning base is provided with several symmetrically arranged pre-reserved fixing holes. The fixing fastener passes through the pre-reserved fixing holes, and the end of the fixing fastener is threaded to the bottom template of the floor slab.

[0007] Furthermore, each annular stepped sidewall is formed by connecting an annular vertical facade and an annular inclined facade, with the annular inclined facade tilting outwards radially from top to bottom along the sleeve body.

[0008] Furthermore, the number of annular stepped sidewalls is 3 to 8, and all annular stepped sidewalls are evenly distributed along the axial direction of the sleeve body.

[0009] Furthermore, the upper outer wall of the sleeve body has an annular top limiting edge extending radially outward.

[0010] Furthermore, the seepage-proof positioning base has an overall circular disc-shaped structure.

[0011] Furthermore, the reserved fixing hole is a countersunk through hole, and the fixing fastener is a countersunk self-tapping screw that matches the countersunk through hole.

[0012] Furthermore, the taper of the frustum-shaped structure of the sleeve body is 1:15 to 1:20.

[0013] Furthermore, the number of connecting bayonets and the number of sleeve positioning keys are both 2 to 4 sets, and all connecting bayonets are evenly and symmetrically arranged along the circumference of the sleeve body.

[0014] Furthermore, the sleeve body is designed as a single-piece molded structure.

[0015] Furthermore, the seepage-proof positioning base is designed as an integrated molded structure.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model uses fasteners to rigidly lock the anti-seepage positioning base to the bottom template of the floor slab, while the connecting slot at the lower end of the sleeve body corresponds to the sleeve positioning key on the anti-seepage positioning base to achieve circumferential positioning. This effectively resists the lateral impact and upward buoyancy during concrete pouring and vibration, eliminating sleeve displacement, floating, and tilting problems. The reserved opening is formed in one go, eliminating the need for secondary hole enlargement and repair, which reduces construction costs and ensures the integrity of the floor slab structure. The multiple annular stepped sidewalls with slopes towards the lower end of the sleeve body can improve the bonding force between the sleeve and the concrete, preventing the sleeve body from loosening and shifting. At the same time, multiple water-stop rings are formed to extend the seepage path and reduce the risk of leakage. The sleeve body adopts a truncated cone-shaped structure that is narrow at the top and wide at the bottom. After the concrete reaches the design strength, only an axial downward hammering force is needed for easy demolding. No brute force is required throughout the process, ensuring the structural integrity of the reserved opening. It has strong versatility and on-site practicality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a structural schematic diagram of the annular stepped sidewall, connecting bayonet, and top limiting edge in this utility model;

[0020] Figure 3This is a schematic diagram of the seepage-proof positioning base, sleeve positioning key, and reserved fixing hole in this utility model;

[0021] Figure 4 This is a partial structural cross-sectional view of the annular stepped sidewall, connecting bayonet, and top limiting edge of this utility model;

[0022] In the picture:

[0023] 1. Bottom formwork of floor slab; 2. Annular stepped sidewall; 201. Annular vertical facade; 202. Annular inclined facade; 3. Connecting bayonet; 4. Anti-seepage positioning base; 5. Fixing fastener; 6. Sleeve positioning key; 7. Reserved fixing hole; 8. Top limiting edge. Detailed Implementation

[0024] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0025] Example 1

[0026] like Figure 1-4 As shown, the pre-reserved bolt hole sleeve for the floor slab includes a sleeve body and a positioning and fixing assembly for positioning and fixing the sleeve body to the bottom template 1 of the floor slab. The sleeve body is a cavity structure with open ends. The sleeve body is generally a frustum-shaped structure with a narrow upper end and a wide lower end. The outer wall of the sleeve body is provided with multiple annular stepped sidewalls 2 that slope towards the lower end of the sleeve body along the axial direction. The lower inner wall of the sleeve body is provided with several symmetrically arranged connecting slots 3. The positioning and fixing assembly includes a seepage-proof positioning base 4 and a fixing fastener 5. The upper surface of the seepage-proof positioning base 4 is provided with a sleeve positioning key 6 that corresponds one-to-one with the connecting slot 3. The sleeve positioning key 6 is correspondingly embedded in the connecting slot 3. The seepage-proof positioning base 4 is provided with several symmetrically arranged pre-reserved fixing holes 7. The fixing fastener 5 passes through the pre-reserved fixing holes 7. The end of the rod of the fixing fastener 5 is threadedly connected to the bottom template 1 of the floor slab.

[0027] Each annular stepped sidewall 2 is formed by connecting an annular vertical facade 201 and an annular inclined facade 202. The annular inclined facade 202 is inclined outward from top to bottom along the radial direction of the sleeve body.

[0028] The number of annular stepped sidewalls 2 is 3 to 8, and all annular stepped sidewalls 2 are evenly distributed along the axial direction of the sleeve body.

[0029] The upper outer wall of the sleeve body has an annular top limiting edge 8 extending radially outward.

[0030] The anti-seepage positioning base 4 has an overall circular disc-shaped structure.

[0031] The reserved fixing hole 7 is a countersunk through hole, and the fixing fastener 5 is a countersunk self-tapping screw that matches the countersunk through hole.

[0032] The taper of the frustum-shaped structure of the sleeve body is 1:15 to 1:20.

[0033] The number of connecting bayonets 3 and the number of sleeve positioning keys 6 are both 2 to 4 sets, and all connecting bayonets 3 are evenly and symmetrically arranged along the circumference of the sleeve body.

[0034] The sleeve body is designed as a single-piece molded structure.

[0035] The seepage-proof positioning base 4 is an integrated molded structure.

[0036] Working process and principle:

[0037] I. Construction Preparation Stage

[0038] After completing the laying, reinforcement and leveling of the bottom formwork 1 of the floor slab, lay out the lines on the bottom formwork 1 of the floor slab according to the reserved openings in the construction drawings, mark the center point of each reserved opening, and complete the construction positioning preparation.

[0039] Align the center point of the seepage prevention positioning base 4 precisely with the marked point on the bottom template 1 of the floor slab, so that the lower surface of the seepage prevention positioning base 4 is completely and tightly fitted with the upper surface of the bottom template 1 of the floor slab without any gaps; then insert the fixing fastener 5 into the reserved fixing hole 7 on the seepage prevention positioning base 4, and screw the end of the fixing fastener 5 into the bottom template 1 of the floor slab to complete the rigid locking of the seepage prevention positioning base 4.

[0040] The reserved fixing hole 7 is a countersunk through hole, and the fixing fastener 5 is a matching countersunk self-tapping screw. After locking, the head of the countersunk self-tapping screw is completely embedded in the countersunk through hole, which does not interfere with the subsequent installation of the sleeve body. At the same time, it can resist the lateral impact force during the subsequent concrete pouring and vibration process, prevent the anti-seepage positioning base 4 from shifting, and lay the foundation for the formation of the reserved opening.

[0041] II. Sleeve Body Installation Stage

[0042] After the anti-seepage positioning base 4 is fixed, the floor slab reinforcement binding operation is carried out. During the reinforcement binding process, the preset position of the reserved opening is avoided to prevent the reinforcement from interfering with the sleeve body installed later.

[0043] After the reinforcement binding is accepted, the connecting slot 3 at the lower end of the sleeve body is aligned with the sleeve positioning key 6 on the upper surface of the seepage prevention positioning base 4. The sleeve body is then pressed down so that the sleeve positioning key 6 is fully embedded in the corresponding connecting slot 3. The lower end face of the sleeve body is tightly fitted with the upper surface of the seepage prevention positioning base 4, thus completing the installation of the sleeve body.

[0044] Both the connecting bayonet 3 and the sleeve positioning key 6 are arranged in 2 to 4 sets, evenly and symmetrically along the circumference. After the two are fitted together, the circumferential positioning of the sleeve body and the anti-seepage positioning base 4 can be realized, which can prevent the sleeve body from rotating or misaligning during subsequent construction, and further ensure the coaxiality and stability of the sleeve installation. The annular top limiting edge 8 set on the outer wall of the upper end of the sleeve body can be used as an elevation benchmark to ensure that the height of the reserved opening after molding is consistent with the design thickness of the floor slab.

[0045] III. Concrete Pouring Operation Stage

[0046] After the sleeve body is installed and passes inspection, the concrete pouring and vibration of the floor slab can be carried out.

[0047] During the concrete pouring process, the concrete mortar is evenly filled into the structural gap of the annular stepped sidewall 2 on the outer wall of the sleeve body, and is completely in contact with the annular vertical surface 201 and the annular inclined surface 202 of each annular stepped sidewall 2 until the concrete is poured to the floor slab design elevation and is flush with the top limit edge 8 of the sleeve body, thus completing the pouring operation.

[0048] The annular stepped sidewall 2 is evenly distributed along the axial direction of the sleeve body. During the concrete pouring and vibration process, the annular stepped sidewall 2 can completely resist the upward buoyancy of the concrete, preventing the sleeve body from tilting or floating vertically, and ensuring that the reserved opening is formed in one go. Multiple continuous annular stepped sidewalls 2 can form multiple water-stop rings, which greatly extends the seepage path of the reserved opening and reduces the risk of subsequent leakage.

[0049] IV. Demolding and demolding stage

[0050] After the concrete of the floor slab has solidified to the demolding strength, the removal of the bottom formwork 1 of the floor slab is carried out first. Since the anti-seepage positioning base 4 is firmly locked to the bottom formwork 1 of the floor slab by the fixing fasteners 5, when the bottom formwork 1 of the floor slab is removed, the anti-seepage positioning base 4 will be separated from the sleeve body at the same time as the formwork. There is no need to remove the screws. The lower end of the sleeve body is completely exposed and unobstructed.

[0051] Workers stand on the top surface of the floor slab and use a hammer to evenly tap the upper part of the sleeve body, applying an axial downward impact force. Because the sleeve body has a truncated cone shape, narrow at the top and wide at the bottom, it moves axially towards the direction with a larger diameter when tapped downwards. Only a few even, light taps are needed to completely remove the sleeve body from under the floor slab, completing the demolding operation. The entire process requires no brute force prying or pulling, ensuring the structural integrity of the reserved opening, eliminating the need for secondary hole enlargement or repair, and reducing construction costs.

Claims

1. A floor bolt hole sleeve for a preformed bolt hole, comprising a sleeve body, a positioning and fixing assembly for positioning and fixing the sleeve body to a floor bottom formwork (1), the sleeve body being a cavity structure with open ends, characterized in that, The sleeve body is a truncated cone-shaped structure with a narrow upper end and a wide lower end. The outer wall of the sleeve body is continuously provided with multiple annular stepped sidewalls (2) that slope towards the lower end of the sleeve body. The inner wall of the lower end of the sleeve body is provided with several symmetrically arranged connecting slots (3). The positioning and fixing components include a seepage-proof positioning base (4) and a fixing fastener (5). The upper surface of the seepage-proof positioning base (4) is provided with a sleeve positioning key (6) that corresponds to the connecting slot (3). The sleeve positioning key (6) is embedded in the connecting slot (3). The seepage-proof positioning base (4) is provided with several symmetrically arranged reserved fixing holes (7). The fixing fastener (5) passes through the reserved fixing holes (7). The end of the rod of the fixing fastener (5) is threaded to the bottom template (1) of the floor slab.

2. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, Each annular stepped sidewall (2) is formed by connecting an annular vertical facade (201) and an annular inclined facade (202). The annular inclined facade (202) is inclined outward along the radial direction of the sleeve body from top to bottom.

3. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The number of annular stepped sidewalls (2) is 3 to 8, and all annular stepped sidewalls (2) are evenly distributed along the axial direction of the sleeve body.

4. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The upper outer wall of the sleeve body has an annular top limiting edge (8) extending radially outward.

5. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The anti-seepage positioning base (4) has an overall circular disc structure.

6. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The reserved fixing hole (7) is a countersunk through hole, and the fixing fastener (5) is a countersunk self-tapping screw that matches the countersunk through hole.

7. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The taper of the frustum-shaped structure of the sleeve body is 1:15 to 1:

20.

8. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The number of connecting bayonets (3) and the number of sleeve positioning keys (6) are both 2 to 4 sets, and all connecting bayonets (3) are evenly and symmetrically arranged along the circumference of the sleeve body.

9. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The sleeve body is designed as a single-piece molded structure.

10. The sleeve for pre-reserved bolt holes in floor slabs according to claim 1, characterized in that, The anti-seepage positioning base (4) is an integrated molded structure.

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