A pre-embedded matched high-strength T bolt

Abstract

The utility model relates to bolt technical field especially a kind of high-strength T bolt of pre-burying matching, including T bolt body and the positioning mechanism matched with T bolt body, positioning mechanism includes locating cylinder, the push block being set in locating cylinder and the inner support block being matched with push block and being set in the side of locating cylinder, the side of locating cylinder is uniformly provided with 4 through slots, each through slot is matched with one inner support block, the inside center of locating cylinder is provided with the cavity being communicated with all through slots, push block is slidably installed in cavity, and the end of all inner support blocks towards cavity is all in contact with the side wall of push block, the straight rod bolt head of T bolt body is provided with jacking screw rod on the end of body screw rod back, jacking screw rod is matched with the threaded hole on locating cylinder and extends into cavity and is in contact with push block, the utility model can improve the use precision of T bolt and the matching strength with concrete structure.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, specifically to a pre-embedded high-strength T-bolt. Background Technology

[0002] T-bolts, due to their unique T-shaped head structure, offer significant advantages in building pre-embedded components, enabling rapid assembly with connecting plates or equipment bases. These bolts are typically used in scenarios requiring pre-embedded fixing, such as concrete foundation connections. Their traditional structure mainly consists of a straight bolt head and a vertically connected threaded rod. In actual construction, the traditional method requires first fixing the bolt in a pre-drilled hole in a positioning template, then removing the template after the concrete has been poured and solidified to finally achieve the connection with the external structure.

[0003] However, the existing T-bolt pre-embedding process has several technical bottlenecks: First, positioning accuracy is difficult to guarantee. Because it relies entirely on the fixing effect of the template positioning holes, the bolt position is easily shifted during concrete pouring due to the impact of concrete flow or template deformation. This shift often causes significant installation deviations after demolding, seriously affecting the installation accuracy of subsequent equipment and potentially leading to quality problems for the entire project. Second, the bond strength between traditional bolts and concrete is insufficient. The smooth bolt surface lacks effective mechanical interlocking with the concrete, making it prone to loosening or even complete pull-out during long-term use under vibration or tensile stress, posing a safety hazard.

[0004] Furthermore, existing technologies lack effective on-site adjustment mechanisms. If bolts shift during pouring, real-time adjustment is difficult, often requiring the destruction of already poured concrete for rework, resulting in material waste and severely impacting construction progress. Simultaneously, traditional bolt fixing methods demand extremely high precision from the formwork, increasing construction costs and difficulty.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pre-embedded matching high-strength T-bolt.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pre-embedded high-strength T-bolt, comprising a T-bolt body and a positioning mechanism that cooperates with the T-bolt body. The positioning mechanism includes a positioning cylinder, a pushing block disposed within the positioning cylinder, and an inner support block that cooperates with the pushing block and is disposed on the side of the positioning cylinder. The side of the positioning cylinder is evenly provided with four through slots, and an inner support block is disposed within each through slot. The center of the positioning cylinder has a cavity communicating with all the through slots. The pushing block is slidably installed within the cavity, and the end of each inner support block facing the cavity abuts against the side wall of the pushing block. The cavity has a large height. Regarding the height of the pushing block, the cross-section of the pushing block is set in the shape of an inverted isosceles trapezoid, and the cross-section of the inner support block is set in the shape of a right trapezoid. The inclined end of the inner support block abuts against the inclined end of the pushing block. A threaded hole communicating with the cavity is provided at the center of the upper end of the positioning cylinder. An elastic band is provided on the outer side of the positioning cylinder and fitted onto the outer ends of all the inner support blocks. A top support screw is provided at the end of the straight rod-shaped bolt head of the T-bolt body facing away from the body screw. The top support screw cooperates with the threaded hole on the positioning cylinder and extends into the cavity to press against the pushing block. A hexagonal protrusion is integrally provided on the end of the body screw of the T-bolt body near the head of the straight rod-shaped bolt.

[0008] In some embodiments, a T-shaped limiting strip is provided on the contact surface between the pushing block and the inner support block, and a T-shaped sliding groove that cooperates with the T-shaped limiting strip is provided on the inner support block.

[0009] In some embodiments, a limiting groove is provided at the outer end of the inner support block to mate with the elastic band connection.

[0010] In some embodiments, elastic bands are provided at the upper and lower ends of the positioning cylinder.

[0011] In some embodiments, the positioning mechanism is made entirely of plastic or metal.

[0012] In some embodiments, the outer surface of the inner support block is provided with friction protrusions.

[0013] In some embodiments, a plurality of limiting protrusions are evenly arranged between the end of the T-bolt body near the head of the straight bolt and the hexagonal protrusion.

[0014] Compared with the prior art, the beneficial effects of this utility model are: through the linkage structure of the positioning cylinder, the pushing block and the inner support block, combined with the driving action of the top support screw, the inner support block can be accurately tightened to the preset hole position. At the same time, the hexagonal protrusion and the limiting protrusion ring are used to enhance the bonding strength with the concrete, which solves the problems of low positioning accuracy and insufficient bonding strength of traditional pre-embedded bolts. It has the advantages of improving positioning accuracy, enhancing structural stability and simplifying the construction process.

[0015] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the positioning mechanism structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the T-bolt structure of this utility model;

[0019] Figure 4 This is a cross-sectional view of the positioning mechanism of this utility model;

[0020] Figure 5 This is a schematic diagram of the cooperative structure of the push block and the inner support block of this utility model.

[0021] In the diagram: 1. T-bolt body; 2. Positioning mechanism; 3. Positioning cylinder; 4. Push block; 5. Inner support block; 6. Through groove; 7. Cavity; 8. Threaded hole; 9. Elastic band; 10. Straight rod bolt head; 11. Body screw; 12. Top support screw; 13. Hexagonal protrusion; 14. T-shaped limiting strip; 15. T-shaped sliding groove; 16. Limiting groove; 17. Limiting protrusion ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In traditional T-bolt pre-embedded fixing processes, the reliance on external template positioning holes for fixation means that the dynamic pressure of the fluid during concrete pouring can easily cause spatial displacement of the bolts. Furthermore, the smooth surface of the bolts results in insufficient interfacial bonding strength with the concrete matrix. These issues directly affect the geometric accuracy of the equipment base installation and reduce the structure's pull-out resistance under dynamic loads.

[0024] For example, in the construction of concrete foundations for large centrifugal compressor units, an array of T-bolts spaced 800mm apart needs to be pre-embedded along the foundation axis. During concrete pouring, the flowing concrete, pumped at a pressure of 0.8MPa, exerts a lateral impact on the formwork, causing the axial offset of adjacent bolts to exceed the design tolerance of ±3mm. During equipment installation, bolt position deviations necessitate the use of hole-enlarging compensation measures, resulting in uneven stress distribution at the flange connection surface. During equipment operation, the 12Hz periodic vibration generated by the compressor rotor is transmitted to the bolts through the base, gradually causing microcracks to propagate at weak points in the interface, ultimately leading to a decrease in bolt pull-out strength to 67% of the design value.

[0025] If the above problems are not resolved, the flatness of the equipment base mounting surface will fail to meet the requirements of ISO 10721-1 standard, leading to drive shaft misalignment failure and abnormal bearing wear. Insufficient interface bonding strength will significantly reduce the structure's seismic performance under magnitude 6 earthquake conditions, posing a risk of equipment overturning. Simultaneously, the cumulative positional error of the bolt array will force a rework rate of 23%, extending the construction period and increasing the foundation cost per square meter by approximately 15%.

[0026] To address the aforementioned issues, this application first analyzes the mechanism of bolt displacement caused by concrete flow impact, finding that traditional template positioning methods cannot effectively resist dynamic pressure. To resolve this, a positioning component with active adjustment function is added to the bolt body to achieve self-positioning within the hole through a mechanical structure. Further research reveals that simply adding a rigid support structure hinders concrete flow, resulting in incomplete compaction, while flexible constraints cannot guarantee positioning accuracy. Therefore, a scheme combining a retractable internal support block and a rotation drive is proposed. Before pouring, the support structure is unfolded by the bolt's own rotation, allowing for real-time adjustment of the positioning state while preventing premature unfolding that could hinder concrete filling. Simultaneously, addressing the issue of insufficient interfacial bonding, it is found that traditional bolt surface treatment can only increase roughness to a limited extent and cannot form effective mechanical interlocking. To address this, a multi-level limiting structure is considered at key bolt locations, increasing the contact area and stress distribution during concrete encapsulation through geometric changes.

[0027] In this regard, such as Figures 1 to 5As shown, this application proposes a pre-embedded high-strength T-bolt, including a T-bolt body 1 and a positioning mechanism 2 that cooperates with the T-bolt body 1. The positioning mechanism 2 includes a positioning cylinder 3, a pushing block 4 disposed inside the positioning cylinder 3, and an inner support block 5 that cooperates with the pushing block 4 and is disposed on the side of the positioning cylinder 3. The side of the positioning cylinder 3 is evenly provided with four through slots 6, and an inner support block 5 is disposed in each through slot 6. The center of the positioning cylinder 3 is provided with a cavity 7 that communicates with all the through slots 6. The pushing block 4 is slidably installed in the cavity 7, and the... Some of the inner support blocks 5 have their ends facing the cavity 7 in contact with the side wall of the push block 4. The height of the cavity 7 is greater than the height of the push block 4. The cross-section of the push block 4 is shaped like an inverted isosceles trapezoid, and the cross-section of the inner support block 5 is shaped like a right trapezoid. The inclined end of the inner support block 5 abuts against the inclined end of the push block 4. A threaded hole 8 is provided at the center of the upper end of the positioning cylinder 3, which connects to the cavity 7. An elastic band 9 is provided on the outer side of the positioning cylinder 3, which is fitted onto the outer ends of all the inner support blocks 5. The straight bolt head 10 of the T-bolt body 1 faces away from the body screw 11. A top support screw 12 is provided at one end. The top support screw 12 engages with the threaded hole 8 on the positioning cylinder 3 and extends into the cavity 7 to press against the push block 4. A hexagonal protrusion 13 is integrally provided on one end of the body screw 11 of the T-bolt body 1 near the head 10 of the straight rod. When it is necessary to install and fix the T-bolt, the T-bolt of this application is engaged with the positioning mechanism 2 and placed into the predetermined hole. Then, the T-bolt is rotated by engaging the socket wrench with the hexagonal protrusion 13, so that the T-bolt rotates relative to the positioning cylinder 3 and causes the T-bolt to rotate. The top support screw 12 on the T-bolt moves into the positioning cylinder 3 and presses against the pushing block 4, causing the pushing block 4 to drive the inner support block 5 to extend out of the positioning cylinder 3. When the outer end of the inner support block 5 presses against the inner wall of the preset hole, the rotation of the T-bolt stops. Then, the T-bolt is adjusted for precision. After the adjustment is completed, the T-bolt is rotated again so that all the inner support blocks 5 work together to tighten the inner wall of the preset hole. After the positioning operation is completed, concrete is poured into the preset hole. Once the concrete has solidified, the T-bolt is fixed.

[0028] The T-bolt body 1 refers to a T-shaped structure composed of a straight bolt head 10 and a main bolt 11. It can be formed by forging or machining. The straight bolt head 10 and the main bolt 11 are perpendicularly connected to form the T-shaped structure. The positioning mechanism 2 is a component used to fix and adjust the position of the T-bolt, specifically including a positioning cylinder 3, a pushing block 4, and an inner support block 5. The positioning cylinder 3 has a cavity 7 and a through groove 6 inside. The pushing block 4 slides within the cavity 7 and drives the inner support block 5 to move outward through contact with the inclined surface. The positioning cylinder 3 is a cylindrical shell structure, specifically made of metal or plastic. Four through grooves 6 are evenly distributed on its side circumference, and a cavity 7 is located in the center inside. The through grooves 6 communicate with the cavity 7 to accommodate the inner support block 5 and the pushing block 4. The pushing block 4 is a sliding component with an inverted isosceles trapezoidal cross-section. It contacts the inner support block 5 through an inclined surface and, when moving up and down within the cavity 7, pushes the inner support block 5 to extend outward or retract inward along the through groove 6. The inner support block 5 is a right-angled trapezoidal cross-section support component, specifically made of metal or plastic. Its inclined end contacts the push block 4, and its outer end is constrained by the elastic band 9. Driven by the push block 4, it outwardly supports the inner wall of the preset hole. The top support screw 12 is a threaded rod located at the end of the T-bolt head, specifically engaging with the threaded hole 8 at the upper end of the positioning cylinder 3. By rotating the T-bolt, the top support screw 12 extends into the cavity 7 and presses against the push block 4, driving the inner support block 5 to move outward. The hexagonal protrusion 13 is a hexagonal structure located near the head end of the main body screw 11, specifically engaging with a socket wrench. By rotating the hexagonal protrusion 13, the T-bolt rotates, thereby controlling the axial displacement of the top support screw 12. The elastic band 9 is an elastic constraint component sleeved on the outer end of the inner support block 5, specifically made of rubber or polymer material, used to restrict the position of the inner support block 5 in the non-working state, preventing it from detaching from the positioning cylinder 3. The limiting protrusion 17 refers to the annular protrusion set on the main body screw 11. Specifically, it increases the contact area with concrete, improves the mechanical interlocking effect, and enhances the bolt's pull-out resistance.

[0029] The core innovation of this application lies in the cooperation between the positioning mechanism 2 and the top support screw 12, using the rotating T-bolt to drive the inner support block 5 to tighten the inner wall of the preset hole, so as to realize the simultaneous completion of pre-embedded positioning and concrete pouring, and at the same time, the structural stability is enhanced by the combination of the limiting protrusion ring 17 and the friction protrusion.

[0030] The working process and principle of this application are as follows: the T-bolt body 1 is used in conjunction with the positioning mechanism 2. The positioning mechanism 2 includes a positioning cylinder 3, a pushing block 4, and an inner support block 5. The positioning cylinder 3 has four through slots 6 on its side, and each through slot 6 is equipped with an inner support block 5. The positioning cylinder 3 has a cavity 7 in its center, which communicates with the through slots 6. The pushing block 4 is slidably installed in the cavity 7, and one end of the inner support block 5 abuts against the side wall of the pushing block 4. The cross-section of the pushing block 4 is an inverted isosceles trapezoid, and the cross-section of the inner support block 5 is a right trapezoid, with their inclined surfaces abutting each other. The upper center of the positioning cylinder 3 has a threaded hole 8 that communicates with the cavity 7, and an elastic band 9 is fitted on the outer side to fix the inner support block 5. The straight rod-shaped bolt head 10 of the T-bolt body 1 has a top support screw 12 facing away from the screw end, which cooperates with the threaded hole 8 of the positioning cylinder 3 and extends into the cavity 7 to press against the pushing block 4. The body screw 11 has a hexagonal protrusion 13 near the end of the straight rod-shaped bolt head 10.

[0031] During installation, the T-bolt is placed into the predetermined hole position using the positioning mechanism 2. The hexagonal protrusion 13 is rotated using a socket wrench, causing the T-bolt to rotate relative to the positioning cylinder 3. The top support screw 12 moves inward into the positioning cylinder 3 and presses against the pushing block 4, which in turn causes the inner support block 5 to extend outward. The inner support block 5 stops rotating after pressing against the inner wall of the preset hole position, allowing for a secondary precision adjustment. The T-bolt is then rotated further to tighten the inner support block 5 against the inner wall of the preset hole position, completing the positioning. Finally, concrete is poured into the preset hole position, and the T-bolt is fixed after it has solidified.

[0032] This design achieves the self-positioning function of the bolt by combining the retractable inner support block 5 with a rotation drive. The deployment of the inner support block 5 is controlled by the bolt rotation, preventing premature deployment that could obstruct concrete filling. Simultaneously, the multi-stage limiting structure increases the contact area between the bolt and the concrete, improving the interfacial bonding strength.

[0033] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0034] The T-bolt body 1 is made of high-strength alloy steel and includes a straight bolt head 10 and a main bolt 11. A support bolt 12 is provided at the end of the straight bolt head 10 facing away from the main bolt 11, and a hexagonal protrusion 13 is provided at the end of the main bolt 11 near the straight bolt head 10. The positioning mechanism 2 is made of engineering plastic and includes a positioning cylinder 3, a pushing block 4, and an inner support block 5. The positioning cylinder 3 is cylindrical with four rectangular through slots 6 evenly distributed on its side. A cylindrical cavity 7 is located at the center of the positioning cylinder 3, communicating with the through slots 6. The pushing block 4 is an inverted isosceles trapezoidal prism, slidably installed within the cavity 7. The inner support block 5 is a right-angled trapezoidal block, installed within the through slots 6, with its inclined surface abutting against the inclined surface of the pushing block 4. A threaded hole 8 is located at the center of the upper end of the positioning cylinder 3, communicating with the cavity 7. An elastic band 9 is fitted onto the outer surface of the positioning cylinder 3 to fix the inner support block 5.

[0035] During installation, assemble the T-bolt with the positioning mechanism 2 and insert it into the pre-drilled hole. Use a socket wrench to rotate the hexagonal protrusion 13, causing the top support screw 12 to move into the positioning cylinder 3. The top support screw 12 presses against the pushing block 4, which in turn causes the inner support block 5 to extend outward. After the inner support block 5 presses against the hole wall, make precise adjustments. Continue rotating to tighten the inner support block 5 against the hole wall, completing the positioning. Finally, pour concrete and allow it to solidify for final fixation.

[0036] Through the above-described scheme, this application achieves high-precision pre-embedded positioning of T-bolts. The retractable inner support block 5 effectively resists the dynamic pressure during concrete pouring, preventing bolt displacement. The multi-level limiting structure increases the contact area between the bolt and the concrete, improving the interfacial bonding strength. This design significantly improves the bolt positioning accuracy and pull-out resistance, solving the problems of insufficient positioning accuracy and weak bonding with concrete in traditional T-bolt pre-embedded applications.

[0037] This application further proposes to provide a T-shaped limiting strip 14 on the contact surface between the push block 4 and the inner support block 5, and to provide a T-shaped sliding groove 15 on the inner support block 5 that cooperates with the T-shaped limiting strip 14.

[0038] The T-shaped limiting strip 14 extends longitudinally along the inclined end of the push block 4, and its cross-section has a T-shaped geometric structure. Horizontally extending limiting wing plates are symmetrically arranged on both sides. A T-shaped groove 15 is formed at the inclined end of the inner support block 5. The groove depth matches the thickness of the limiting wing plate, and the groove width is smaller than the unfolded width of the limiting wing plate. After the limiting wing plate is embedded in the groove, it forms a lateral constraint, restricting the relative motion freedom between the inner support block 5 and the push block 4. The fit clearance between the limiting strip and the groove is controlled within the range of 0.1-0.3 mm, ensuring smooth sliding while avoiding excessive looseness.

[0039] Specifically, when the top support screw 12 pushes the push block 4 downward, the limiting wing plate slides longitudinally along the slide groove, forcing the inner support block 5 to expand outward along a predetermined trajectory. Due to the wrapping effect of the slide groove on the limiting wing plate, the inner support block 5 cannot detach from the contact surface of the push block 4. Even when the elastic band 9 is not under tension, the inner support block 5 still maintains its assembly relationship with the positioning cylinder 3. When the push block 4 resets, the contact surface between the limiting wing plate and the side wall of the slide groove generates a reverse friction force, assisting the inner support block 5 to retract synchronously. This structure eliminates unexpected displacement between components through mechanical interlocking, ensuring that the inner support block 5 always maintains a circumferentially uniform distribution state within the cavity 7, and avoiding the failure of the positioning mechanism 2 due to unilateral detachment.

[0040] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0041] A T-shaped limiting strip 14 is provided on the contact surface between the pushing block 4 and the inner support block 5, and a T-shaped sliding groove 15 is provided on the inner support block 5 to cooperate with the T-shaped limiting strip 14. The cross-section of the T-shaped limiting strip 14 is "T"-shaped, including a vertical part and a horizontal part. The vertical part is embedded in the surface of the pushing block 4, and the horizontal part protrudes from the surface of the pushing block 4. The shape of the T-shaped sliding groove 15 matches the T-shaped limiting strip 14, including a vertical groove and a horizontal groove. The width of the vertical groove is slightly larger than the width of the vertical part of the T-shaped limiting strip 14, and the width of the horizontal groove is slightly larger than the width of the horizontal part of the T-shaped limiting strip 14. The T-shaped limiting strip 14 is inserted into the T-shaped sliding groove 15 and can slide along the direction of the groove.

[0042] The T-shaped limiting strip 14 and the T-shaped sliding groove 15 work together to achieve a sliding connection between the pushing block 4 and the inner support block 5. When the pushing block 4 moves downward, the T-shaped limiting strip 14 slides in the T-shaped sliding groove 15, causing the inner support block 5 to move outward. When the pushing block 4 moves upward, the T-shaped limiting strip 14 slides in the opposite direction in the T-shaped sliding groove 15, causing the inner support block 5 to retract inward. This structural design ensures the connection stability between the pushing block 4 and the inner support block 5, preventing the inner support block 5 from falling out of the positioning cylinder 3.

[0043] Through the above technical solution, this application improves the stability of the connection structure between the components of the positioning mechanism 2. The cooperative arrangement of the T-shaped limiting strip 14 and the T-shaped sliding groove 15 achieves a reliable connection between the pushing block 4 and the inner support block 5. This connection method not only ensures the relative movement between the pushing block 4 and the inner support block 5, but also prevents the inner support block 5 from falling out of the positioning cylinder 3. Therefore, when the positioning mechanism 2 is not in use, the inner support block 5 can be stably held in the positioning cylinder 3, avoiding the risk of component loss or damage. At the same time, this structural design also improves the overall stability and durability of the positioning mechanism 2, extending the product's service life.

[0044] This application further proposes that a limiting groove 16 be provided at the connection between the outer end of the inner support block 5 and the elastic band 9.

[0045] The limiting groove 16 is a groove structure extending circumferentially along the outer end of the inner support block 5. The groove depth matches the thickness of the elastic band 9, and the groove width is slightly larger than the width of the elastic band 9. After the elastic band 9 is embedded in the limiting groove 16, its two side edges are restricted by the sidewalls of the groove to prevent lateral displacement. The bottom surface of the limiting groove 16 contacts the inner surface of the elastic band 9, forming friction to resist axial slippage of the elastic band 9.

[0046] Specifically, when the top support screw 12 pushes the pusher block 4, the inner support block 5 is squeezed outward by the inclined surface, and the elastic band 9 is subjected to the tension generated by the movement of the inner support block 5. At this time, the part of the tension band embedded in the limiting groove 16 cannot slide laterally due to the obstruction of the groove sidewall. At the same time, the friction generated by the contact between the bottom surface of the groove and the elastic band 9 offsets the axial tension, so that the elastic band 9 always wraps around the outer end of the inner support block 5. During the concrete pouring stage, when the elastic band 9 is impacted by the flowing concrete, the limiting groove 16 maintains the position of the elastic band 9 through physical limiting and friction, ensuring that the inner support block 5 moves synchronously and evenly tightens the inner wall of the preset hole, avoiding the failure of the inner support block 5 due to the slippage of the elastic band 9.

[0047] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0048] A limiting groove 16 is provided at the connection point between the outer end of the inner support block 5 and the elastic band 9. The limiting groove 16 can be a recessed structure and is provided on the outer end surface of the inner support block 5. The width of the limiting groove 16 matches the width of the elastic band 9, and the depth can be set to 2-3mm. The limiting groove 16 can surround the entire circumference of the outer end of the inner support block 5, or it can be provided only at the part that contacts the elastic band 9. The elastic band 9 can be made of an elastic material, such as rubber or elastic plastic. During installation, the elastic band 9 is stretched and embedded in the limiting groove 16, using its own elastic force to fix the inner support block 5 to the positioning cylinder 3.

[0049] Through the above technical solution, this application can effectively prevent the elastic band 9 from slipping off the inner support block 5. The limiting groove 16 provides a stable fixing position for the elastic band 9, enhancing the connection stability between the inner support block 5 and the positioning cylinder 3. This structural design ensures that the inner support block 5 remains in the predetermined position during T-bolt installation and use, preventing displacement or detachment due to external forces. Simultaneously, this design facilitates the installation and replacement of the elastic band 9, improving product maintainability.

[0050] This application further proposes that elastic bands 9 are provided at the upper and lower ends of the positioning cylinder 3.

[0051] The elastic band 9 is arranged in two loops, one at the top and one at the bottom of the positioning cylinder 3, and the two loops of elastic band 9 respectively surround the outer ends of all the inner support blocks 5. Limiting grooves 16 are provided at the contact points between the outer ends of the inner support blocks 5 and the elastic bands 9, and the depth of the limiting grooves 16 matches the width of the elastic bands 9. The elastic bands 9 can be made of elastic rubber or woven fibers, and their tensile strength must meet the tension requirements when the inner support blocks 5 are unfolded.

[0052] Specifically, when the top support screw 12 pushes the block 4 downward, the inner support block 5 unfolds outward and stretches the elastic band 9. Since elastic bands 9 are provided at both the upper and lower ends, the inner support block 5 is doubly constrained during unfolding, with the elastic bands 9 simultaneously applying a uniform circumferential tension to the inner support block 5. During this process, the limiting groove 16 restricts the elastic band 9 to a fixed position at the outer end of the inner support block 5, preventing axial displacement due to uneven force. The synergistic effect of the upper and lower elastic bands 9 ensures that the inner support blocks 5 move synchronously during unfolding, ensuring consistent contact pressure between all inner support blocks 5 and the inner wall of the preset hole. When concrete is poured, the elastic deformation of the elastic band 9 can counteract the impact force generated by the concrete flow, preventing the inner support block 5 from shifting position.

[0053] As a preferred embodiment, the solution of this application is implemented as follows: Elastic bands 9 are respectively provided at the upper and lower ends of the positioning cylinder 3. The elastic bands 9 are made of elastic material, such as rubber or elastic nylon. The upper elastic band 9 is located at the top edge of the positioning cylinder 3, and the lower elastic band 9 is located at the bottom edge of the positioning cylinder 3. Both elastic bands 9 encircle the positioning cylinder 3 and are fitted onto the outer ends of all the inner support blocks 5. The width of the elastic band 9 is 10mm, and the thickness is 2mm. By providing elastic bands 9 at both the upper and lower ends of the positioning cylinder 3, the position of the inner support blocks 5 can be better constrained, preventing the inner support blocks 5 from falling out of the positioning cylinder 3 when not in use. At the same time, the double elastic bands 9 increase the fixing force on the inner support blocks 5 and improve the overall stability of the positioning mechanism 2.

[0054] Through the above technical solution, this application enhances the fixing effect of the inner support block 5 by setting elastic bands 9 at both the upper and lower ends of the positioning cylinder 3. The setting of double elastic bands 9 improves the overall stability of the positioning mechanism 2 and effectively prevents the inner support block 5 from falling out of the positioning cylinder 3 when not in use. This design improves the pre-embedded positioning accuracy of the T-bolt, reduces the risk of the inner support block 5 shifting position during installation, and thus improves the installation efficiency and reliability of the T-bolt.

[0055] This application further proposes that the positioning mechanism 2 is made entirely of plastic or metal.

[0056] Plastic materials can be manufactured using injection molding to achieve complex structures in a single process, such as the integrated molding of positioning cylinder 3, pushing block 4, and inner support block 5, reducing manufacturing costs and improving production efficiency. Metal materials can be manufactured using casting or machining processes, such as aluminum alloy or stainless steel, to improve the compressive strength and corrosion resistance of positioning mechanism 2. The choice between the two materials can be adjusted according to the actual application scenario; for example, plastic can be used in scenarios requiring lightweighting, while metal can be used in scenarios requiring high strength.

[0057] Specifically, when the positioning mechanism 2 is made of plastic, its low density and certain elasticity allow it to absorb some stress through material deformation when the inner support block 5 expands outward, preventing damage to the inner wall of the preset hole due to excessive rigidity. When metal is used, its high rigidity ensures efficient force transmission between the pushing block 4 and the inner support block 5, preventing insufficient clamping force due to material deformation. Furthermore, the corrosion resistance of plastic or metal allows it to withstand the humid conditions of concrete pouring environments, preventing rust or aging from affecting the reusability of the positioning mechanism 2.

[0058] As a preferred embodiment, the solution of this application is specifically implemented as follows: The positioning mechanism 2 is entirely made of plastic. The positioning mechanism 2 includes a positioning cylinder 3, a pushing block 4, and an inner support block 5. The positioning cylinder 3 is injection molded from polycarbonate material, which has good strength and wear resistance. The pushing block 4 and the inner support block 5 are made of nylon material, which has self-lubricating properties and reduces friction. The plastic positioning mechanism 2 is lightweight, making it easy to install and adjust. At the same time, the plastic material has a certain degree of elasticity, which can absorb some vibration during concrete pouring and reduce bolt position displacement.

[0059] Through the above technical solution, this application achieves a lightweight design for the positioning mechanism 2, facilitating installation and adjustment by construction personnel. The plastic material has excellent corrosion resistance, extending the service life of the positioning mechanism 2. Simultaneously, the elastic properties of the plastic material can act as a buffer during concrete pouring, reducing bolt position displacement and improving pre-embedding accuracy. Furthermore, the plastic positioning mechanism 2 has lower costs, contributing to reduced overall production costs.

[0060] This application further proposes that the outer surface of the inner support block 5 is provided with friction protrusions. By setting the friction protrusions, the fit between the inner support block 5 and the inner wall of the preset hole can be improved, and the displacement and shaking during the concrete pouring process can be avoided.

[0061] The friction protrusions employ a regularly arranged rhomboid protrusion structure, with the height of each protrusion controlled within the range of 0.5-1.2 mm. When the inner support block 5 is extended to the working state, the protrusions embed into the surface of the hole wall to form a mechanical engagement. The elastic band 9 maintains elastic constraint during the extension of the inner support block 5, ensuring that multiple inner support blocks 5 expand outward synchronously and that the friction protrusions uniformly contact the hole wall.

[0062] Specifically, when the top support screw 12 pushes the pusher block 4 downward, the inner support block 5 unfolds outward under the action of the inclined plane. At this time, the friction protrusions contact the concrete hole wall, and the prismatic protrusions penetrate the hole wall surface to form local depressions. During the concrete pouring process, when the impact force of the flowing concrete acts on the inner support block 5, the mechanical resistance generated by the friction protrusions can counteract the lateral force. The elastic band 9 continuously applies radial restraint force to the inner support block 5 to prevent the inner support block 5 from retracting under vibration and to maintain the contact pressure between the friction protrusions and the hole wall. After the concrete solidifies, the interlocking structure formed by the friction protrusions and the hardened concrete produce a permanent anchoring effect.

[0063] As a preferred embodiment, the solution of this application is implemented as follows: friction protrusions are provided on the outer surface of the inner support block 5. The friction protrusions can take various forms, such as hemispherical, conical, or prismatic protrusions. These protrusions are evenly distributed on the outer surface of the inner support block 5, forming a certain degree of roughness. The height of the friction protrusions can be adjusted according to actual needs, typically between 0.5mm and 2mm. The number and distribution density of the protrusions can also be determined according to the size of the inner support block 5 and the expected frictional force requirements. When the inner support block 5 tightens against the inner wall of the preset hole, these friction protrusions will generate a larger contact area and frictional force with the hole wall.

[0064] Through the above technical solution, this application increases the friction between the inner support block 5 and the inner wall of the preset hole, enhancing the stability of the positioning mechanism 2 during concrete pouring. This design effectively prevents the T-bolt from shifting or shaking during concrete pouring, ensuring precise bolt positioning. Simultaneously, the presence of the friction protrusions increases the mechanical engagement between the inner support block 5 and the concrete, further improving the connection strength between the T-bolt and the concrete, and enhancing the overall structural stability and durability.

[0065] This application further proposes that multiple limiting protrusions 17 are evenly arranged between one end of the main body screw 11 near the head 10 of the straight rod-shaped bolt and the hexagonal protrusion 13.

[0066] The limiting protrusions 17 are distributed circumferentially along the main body screw 11, and their outer diameter is larger than that of the main body screw 11. An annular groove is formed between adjacent limiting protrusions 17. The axial spacing of the limiting protrusions 17 is designed according to the stress distribution after concrete pouring, for example, the spacing is 5-8 mm and the height is 2-3 mm. The area between the limiting protrusions 17 and the hexagonal protrusions 13 is enlarged by adding a surface undulation structure to expand the contact interface with the concrete.

[0067] Specifically, during concrete pouring, liquid concrete fills the annular groove formed by the limiting protrusion 17, and after solidification, forms a mechanical engagement. The even distribution of multiple limiting protrusions 17 disperses stress concentration, preventing cracking in localized areas due to excessive stress. The axial spacing and height parameters of the limiting protrusions 17 are optimized to ensure sufficient contact area without affecting the installation and positioning of the bolt due to excessive protrusion height. Through the cooperation between the limiting protrusions 17 and the hexagonal protrusions 13, the pull-out resistance between the T-bolt body 1 and the concrete is enhanced, thereby strengthening the stability of the overall connection structure.

[0068] As a preferred embodiment, the solution of this application is implemented as follows: Multiple limiting protrusions 17 are evenly arranged on the body screw 11 of the T-bolt body 1, near the end of the straight bolt head 10 and the hexagonal protrusion 13. The limiting protrusions 17 have a ring structure and are evenly distributed along the axial direction of the body screw 11. The outer diameter of the limiting protrusions 17 is larger than the diameter of the body screw 11, forming a protruding structure. The number of limiting protrusions 17 can be 3-5, with a spacing of 10-15mm. The cross-section of the limiting protrusions 17 can be circular, square, or triangular. The limiting protrusions 17 can be integrally formed using the same material as the body screw 11, or they can be fixed to the body screw 11 by welding or mechanical connection using different materials.

[0069] Through the above technical solution, this application increases the contact area and mechanical interlocking effect between the bolt and concrete by setting multiple limiting protrusions 17 on the body screw 11 of the T-bolt body 1. This structural design can effectively improve the connection strength between the bolt and the concrete, and reduce the risk of the bolt loosening or being pulled out due to vibration or tension during use. At the same time, the setting of the limiting protrusions 17 can also increase the stability of the bolt in the concrete, and improve the reliability and durability of the overall structure. In addition, the uniform distribution of multiple limiting protrusions 17 can also ensure that the bolt is subjected to more uniform stress in the concrete, further enhancing the overall strength of the connection structure.

[0070] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-embedded high-strength T-bolt, characterized in that: The device includes a T-bolt body (1) and a positioning mechanism (2) that cooperates with the T-bolt body (1). The positioning mechanism (2) includes a positioning cylinder (3), a push block (4) disposed inside the positioning cylinder (3), and an inner support block (5) that cooperates with the push block (4) and is disposed on the side of the positioning cylinder (3). The side of the positioning cylinder (3) is evenly provided with four through slots (6). An inner support block (5) is disposed in each through slot (6). The center of the positioning cylinder (3) is provided with a cavity (7) that communicates with all the through slots (6). The push block (4) is slidably installed in the cavity (7), and the end of all the inner support blocks (5) facing the cavity (7) abuts against the side wall of the push block (4). The height of the cavity (7) is greater than the height of the push block (4). The cross-section of the push block (4) is shaped like a cross-section of a T-bolt body (1). The inner support block (5) is set in the shape of an inverted isosceles trapezoid. The cross section of the inner support block (5) is set in the shape of a right trapezoid. The inclined end of the inner support block (5) abuts against the inclined end of the push block (4). The upper center of the positioning cylinder (3) is provided with a threaded hole (8) that connects to the cavity (7). The outer side of the positioning cylinder (3) is provided with an elastic band (9) that is fitted on the outer side of all the inner support blocks (5). The straight rod-shaped bolt head (10) of the T-bolt body (1) is provided with a top support screw (12) at the end facing away from the body screw (11). The top support screw (12) cooperates with the threaded hole (8) on the positioning cylinder (3) and extends into the cavity (7) to press against the push block (4). The body screw (11) of the T-bolt body (1) is integrally provided with a hexagonal protrusion (13) at the end near the straight rod-shaped bolt head (10).

2. The pre-embedded high-strength T-bolt according to claim 1, characterized in that: A T-shaped limiting strip (14) is provided on the contact surface between the pushing block (4) and the inner support block (5), and a T-shaped groove (15) is provided on the inner support block (5) to cooperate with the T-shaped limiting strip (14).

3. The pre-embedded high-strength T-bolt according to claim 1, characterized in that: A limiting groove (16) is provided at the connection between the outer end of the inner support block (5) and the elastic band (9).

4. The pre-embedded high-strength T-bolt according to claim 3, characterized in that: The positioning cylinder (3) is provided with elastic bands (9) at its upper and lower ends respectively.

5. The pre-embedded high-strength T-bolt according to claim 1, characterized in that: The positioning mechanism (2) is made entirely of plastic or metal.

6. The pre-embedded high-strength T-bolt according to claim 1, characterized in that: The outer surface of the inner support block (5) is provided with friction protrusions.

7. The pre-embedded high-strength T-bolt according to claim 1, characterized in that: Multiple limiting protrusions (17) are evenly arranged between the end of the body screw (11) of the T-bolt body (1) near the straight rod-shaped bolt head (10) and the hexagonal protrusion (13).

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