Embedded connecting structure for I-beam hoisting and construction method

Abstract

The invention relates to the technical field of bridge construction, and particularly discloses an embedded connecting structure for I beam hoisting and a construction method.The embedded connecting structure comprises a U-shaped steel strand and a positioning mechanism used for assisting the U-shaped steel strand in positioning and embedding, and the positioning mechanism comprises a base, fixing pieces rotationally installed at the two ends of the base and positioning plates hinged to the two sides of the base; a limiting groove is formed in the top of the base to support a bent section of the U-shaped steel strand, the fixing piece has a working state of being in lap joint with steel bars on the two sides and a receding state of being stored and withdrawn, the positioning plate has a positioning state of being unfolded outwards and a storage state of being folded downwards, and a containing groove with a clamping piece is formed in the positioning plate; physical isolation and stable clamping are provided for each U-shaped steel strand, the problem that adjacent steel strands are closed and adhered due to stress extrusion in a traditional binding process is solved, meanwhile, U-shaped steel strand displacement caused by impact during concrete pouring is effectively prevented, and the pre-embedding quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a pre-embedded connection structure and construction method for hoisting I-beams. Background Technology

[0002] In engineering fields such as building construction, bridge erection, and large equipment installation, I-beams are used as load-bearing components, cantilever supports, and hoisting transition components due to their excellent bending and shear resistance and high material utilization rate. The stability of the hoisting connection of I-beams is directly related to the safety of the entire construction system, and the pre-embedded connection structure, as the core component connecting the I-beam to the main structure, has its design rationality and construction convenience as key influencing factors in engineering construction.

[0003] Chinese patent document CN112112055B discloses an embedded device and construction method for a large bridge spanning a river. The device includes a base plate set on a concrete pouring surface, with the embedded device body mounted on the base plate. The embedded device body includes a bracket, connecting rods, and support rods mounted on the bracket. In use, the embedded device body, consisting of the bracket, connecting rods, and support rods, facilitates hoisting of the embedded device. A pressure plate is used to fix the bracket to the reinforcing steel bars on the concrete pouring surface, thereby securing the embedded device. This design makes installation more convenient and ensures a more secure installation.

[0004] In existing technologies, the pre-embedded anchorage structure of steel strands has been adopted in some projects in recent years. This structure uses steel strands as anchors, which need to pass through the steel cage at the top of the I-beam, bend both ends and embed them in the concrete, and be tied and fixed with wire, leaving only the middle section forming a U-shaped exposed end for connection with the lifting equipment. However, the following problems often arise when pre-embedding the steel strands: when multiple steel strands are densely arranged, they are easily compressed and become clustered and stuck together, obstructing the filling of gaps in the concrete aggregate, resulting in "hollow areas" or "honeycombs" on the contact surface, severely weakening the gripping force and pull-out safety; in addition, the strong impact and high-frequency vibration during concrete pouring can easily damage the simple bottom binding, causing the steel strands to become skewed, float, or wobble. This positional deviation not only causes insufficient embedment depth and uneven stress, leading to lifting safety hazards, but also makes it difficult to attach the hook later due to inaccurate positioning, seriously affecting the construction quality. Summary of the Invention

[0005] This invention provides a pre-embedded connection structure and construction method for hoisting I-beams, aiming to solve the problems of steel strands in related technologies that are difficult to maintain the design spacing, are prone to merging and sticking, and are difficult to maintain positioning accuracy in dynamic casting environments.

[0006] In a first aspect, the present invention provides an embedded connection structure for hoisting an I-beam, comprising a U-shaped steel strand and a positioning mechanism for assisting the U-shaped steel strand in positioning and embedding. The positioning mechanism includes a base, a fixing component, and a positioning assembly. The top of the base has several limiting grooves along its length to support the bent sections of the U-shaped steel strand. The fixing components are rotatably installed at the front and rear ends of the base. The fixing components have a working state that can fix the base between two adjacent steel bars at the top of the I-beam, and a clearance state that can retract the base outward from between two adjacent steel bars. The positioning assembly includes two positioning plates respectively hinged to the left and right side walls of the base. The positioning plates have a storage state that is folded down to the bottom of the base and a positioning state that is flipped outward relative to the side wall of the base. Each positioning plate has several receiving grooves along its length to accommodate the vertical sections of the U-shaped steel strand. The receiving grooves are equipped with clamping components for clamping and releasing the U-shaped steel strand. When the fixing components are in the clearance state and the positioning plates are in the storage state, the maximum lateral width of the positioning mechanism is less than the gap width between the two vertical sections of the U-shaped steel strand.

[0007] Its effects are as follows: by supporting the bent section of the U-shaped steel strand through the limiting groove and restricting the vertical section of the U-shaped steel strand through the receiving groove, it provides mandatory physical isolation for each U-shaped steel strand, ensuring that the preset gap is always maintained between adjacent U-shaped steel strands. This completely solves the problem of adjacent steel strands sticking together due to the pressure and compression in the traditional binding process. At the same time, in conjunction with the clamping parts to lock the U-shaped steel strands, a stable rigid three-point positioning system is constructed, which effectively resists the impact and vibration during concrete pouring, ensuring that the U-shaped steel strands do not float, sink, tilt or have spacing deviation, ensuring the positional accuracy of the U-shaped steel strands, thereby ensuring the force balance and safety of subsequent hoisting operations.

[0008] Preferably, a groove is formed on the top of the base along its length, and several independently movable limiting blocks are slidably installed in the groove. The limiting blocks can slide along the groove and lock, and the limiting groove is formed at the top of the limiting blocks. The effect is that by adjusting the position of the limiting blocks, the spacing of the limiting grooves and the spacing of the receiving grooves can be made to create a difference, which can create a longitudinal inclination of the U-shaped steel strand, thereby forming a "concrete wedge" after casting, significantly improving the pull-out resistance of the steel strand.

[0009] Preferably, the fixing component includes four support arms and four locking blocks. The four support arms are arranged in pairs, hinged to the front and rear ends of the base respectively, and can rotate horizontally around the hinge axis. The locking blocks are installed at the lower end of the support arms and can slide and lock along the length of the support arms. When the fixing component is in the working state, the support arms rotate to a position perpendicular to the length of the base, allowing the support arms to overlap the reinforcing bars on both sides. At this time, the locking blocks slide along the support arms to lock onto the reinforcing bars. When the fixing component is in the avoidance state, the support arms rotate to a position parallel to the length of the base, allowing the support arms to be stored on the end extension line of the base. The effect is that after the support arms are extended, they form a wide lateral span, which can utilize the reinforcing bars of the I-beam itself as the force support point to ensure that the positioning mechanism is suspended stably. When the support arms rotate to the parallel state, the fixing component can be completely stored within the projection of the end of the base, ensuring that it is not blocked by the reinforcing bars when withdrawing.

[0010] Preferably, the clamping component includes a fixed block and a movable clamping block disposed inside the receiving groove. The fixed block is fixedly installed on one inner wall of the receiving groove, and the movable clamping block is slidably installed inside the receiving groove and can move towards the fixed block and lock. A clamping channel for the vertical section of the U-shaped steel strand to pass through is formed between the movable clamping block and the fixed block. The effect is that, through the opposing compression of the movable clamping block and the fixed block, the vertical section of the U-shaped steel strand can be firmly fixed, preventing it from shaking or displacing under the impact of concrete pouring and the vibration force of compaction, thereby ensuring the positioning accuracy of the U-shaped steel strand.

[0011] Preferably, the support arm is also equipped with a drive structure for driving the locking block to slide. The drive structure includes a lead screw, which is rotatably installed in the support arm along the length of the support arm. An adjustment handle is installed at the end of the lead screw away from the base. The locking block is provided with a threaded hole that is threaded to the lead screw.

[0012] Preferably, the positioning plate is also equipped with a second driving structure for driving the movable clamping block to slide. The second driving structure includes a second lead screw, which is rotatably installed in the positioning plate along the length of the positioning plate. One end of the second lead screw passes through the positioning plate and is equipped with an adjustment handle. The movable clamping block is provided with a threaded hole that is threaded to engage with the second lead screw.

[0013] Preferably, the positioning plate is a telescopic structure, allowing its width to be adjusted, thereby adjusting the lateral spacing between the two receiving slots to accommodate U-shaped steel strands with different opening widths. The effect is that when the opening width of the U-shaped steel strand changes, the extension length of the positioning plate can be adjusted to ensure that the receiving slots are always accurately aligned with the vertical section of the U-shaped steel strand, thus enabling the same equipment to be compatible with the pre-embedded construction of various specifications of U-shaped lifting rings.

[0014] Preferably, the movable clamping block has a concave arc-shaped surface on the side facing the clamping channel that is compatible with the U-shaped steel strand.

[0015] Preferably, the fixed block facing the clamping channel and the concave arc surface of the movable clamping block are both provided with rough structures.

[0016] Secondly, the present invention provides a construction method for hoisting an I-beam, utilizing the aforementioned embedded connection structure for hoisting an I-beam, which includes the following steps: S1. Installation: Place the fastener in the clearance position and the positioning plate in the storage position. Insert the positioning mechanism into the gap between two adjacent steel bars at the top of the I-beam. Then switch the fastener to the working position to fix the base and flip the positioning plates on both sides of the base outward to switch it to the positioning position. S2. Installation: Align the U-shaped steel strand to be embedded from above the base and insert it, so that the vertical sections at both ends of the U-shaped steel strand pass through the receiving grooves on the positioning plates on both sides, until the bent section of the U-shaped steel strand enters the limiting groove at the top of the base. S3. Clamping: After all the U-shaped steel strands have been laid out, the vertical sections of the U-shaped steel strands are clamped and fixed using clamping devices. S4. Casting: Cast the I-beam. After casting is completed and the predetermined strength is reached, release the clamping device from the U-shaped steel strand, flip the positioning plate in the reverse to the storage state, switch the fixing device to the avoidance state, and then remove the positioning mechanism from the pre-embedded U-shaped steel strand.

[0017] Its effects are as follows: through the horizontal rotation and avoidance action of the fixing component and the vertical folding and storage action of the positioning plate, the positioning mechanism can be recovered without damage in the narrow space of the steel cage; through the support and limiting action of the limiting groove on the top of the base and the limiting action of the receiving groove on the positioning plate, a forced physical isolation is provided for each U-shaped steel strand, ensuring that adjacent U-shaped steel strands always maintain the preset spacing, avoiding the problem of adjacent U-shaped steel strands sticking together, and ensuring that the concrete slurry can fully fill the area around each steel strand; during pouring, the bent section of the U-shaped steel strand enters the limiting groove and is restricted from horizontal displacement, while the vertical section is stuck into the receiving groove and is strongly locked by the clamping component. At the same time, the base is locked together with the steel skeleton of the I-beam through the fixing component, forming a stable impact-resistant system that effectively resists fluid impact and mechanical vibration, ensuring the positional accuracy of the pre-embedded lifting ring.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. This invention provides a unique, physically isolated installation position for each U-shaped steel strand through the limiting groove at the top of the base and the receiving grooves on the positioning plates on both sides. This forced physical isolation ensures that the adjacent U-shaped steel strands always maintain a preset gap, completely solving the problem of adjacent steel strands sticking together and bonding together due to force or compression in the traditional binding process. It ensures that the concrete slurry can fully fill the area around each steel strand, so that each steel strand can be wrapped by concrete 360 ​​degrees, which significantly improves the overall stress performance of the pre-embedded node.

[0019] 2. This invention utilizes limiting grooves to restrict the horizontal displacement of the U-shaped steel strand, and uses receiving grooves and clamping devices on both sides of the positioning plates to lock the vertical section of the U-shaped steel strand. At the same time, the entire base is fixed to the steel reinforcement cage of the I-beam by fixing devices. A stable rigid connection system is constructed between the U-shaped steel strand, the positioning mechanism and the steel reinforcement cage. This ensures that the U-shaped steel strand will not float, sink, tilt or deflect during the concrete pouring process, and ensures that the exposed height of the pre-embedded U-shaped steel strand on the beam surface is consistent and neatly arranged. This greatly facilitates the subsequent hooking operation of the lifting equipment and avoids accidents caused by uneven lifting force due to the tilt of the lifting ring.

[0020] 3. This invention adjusts the position of the limiting block to create a difference between the spacing of the limiting groove and the spacing of the receiving groove, thereby forcing adjacent U-shaped steel strands to form an inverted V-shape or a figure-eight shape with longitudinal inclination. When the U-shaped steel strands are subjected to an upward hoisting force, the inclined steel strands will exert lateral pressure on the core concrete, transforming the single adhesive friction force into a stronger mechanical shear resistance, significantly improving the ultimate pull-out bearing capacity of the embedded structure, effectively preventing the risk of "anchorage" during the hoisting of heavy beams, and greatly improving construction safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the assembly structure of the positioning mechanism and the reinforcing bar of the present invention.

[0023] Figure 3 This is a schematic diagram of the assembly structure of the positioning mechanism and the U-shaped steel strand of the present invention.

[0024] Figure 4 This is a schematic diagram of the assembly structure of the clamping member and the U-shaped steel strand of the present invention.

[0025] Figure 5 This is a schematic diagram of the positioning mechanism of the present invention.

[0026] Figure 6This is a schematic diagram showing the fastener of the present invention in the working state and the positioning plate in the positioning state.

[0027] Figure 7 This is a schematic diagram showing the fastener of the present invention in an avoidance state and the positioning plate in a retracted state.

[0028] Figure 8 This is a schematic diagram of the support arm of the present invention in the extended state.

[0029] Figure label: 11. U-shaped steel strand; 12. I-beam; 13. Reinforcing bar; 2. Base; 201. Limiting groove; 21. Sliding groove; 22. Limiting block; 3. Fixing component; 31. Support arm; 32. Locking block; 33. Lead screw one; 4. Positioning plate; 401. Receiving groove; 5. Clamping component; 51. Fixing block; 52. Movable clamping block; 53. Lead screw two. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1-8 As shown, an embedded connection structure for hoisting an I-beam includes a U-shaped steel strand 11 and a positioning mechanism for assisting in the pre-embedding and positioning of the U-shaped steel strand 11. The positioning mechanism includes a base 2, a fixing element 3, and a positioning assembly.

[0032] like Figures 1-3 As shown, the base 2, serving as the load-bearing frame of the entire device, is made of high-strength alloy steel or industrial-grade aluminum profiles through an extrusion molding process, possessing extremely high bending stiffness and corrosion resistance. The main body of the base 2 is a long, semi-cylindrical strip with an upward-convex arc-shaped top surface. The preferred length of the base 2 is the length covering the pre-embedded area at the top of the I-beam 12.

[0033] like Figures 1-3As shown, to securely suspend the base 2 above the reinforcing cage of the I-beam 12, fixing members 3 are provided at both the front and rear ends of the base 2. The fixing member 3 includes four support arms 31, arranged in pairs, symmetrically hinged to both ends of the base 2 via vertical pins. Each support arm 31 has the ability to rotate around the pin in the horizontal plane, with a rotation angle range of 0° to 90°. When the device needs to be inserted into or removed from the reinforcing cage, the support arm 31 rotates inward, making its axis parallel to the length direction of the base 2. At this time, the fixing member 3 is completely contained within the end projection range of the base 2, minimizing the lateral projection width of the device and allowing it to smoothly pass through the gap between two adjacent reinforcing bars 13 at the top of the I-beam 12. When the device is in place, the support arm 31 rotates outward by 90°, making its axis perpendicular to the base 2. At this time, the four support arms 31 extend to both sides to form a wide cantilever beam structure, which can span across the steel bars 13 on both sides and use the steel bars 13 as the force support point to bear the weight of the entire positioning mechanism and the U-shaped steel strand 11.

[0034] like Figures 2-4 As shown, to accommodate steel bars 13 with different spacing, a locking block 32 is slidably installed on the support arm 31. The locking block 32 can slide and lock along the length of the support arm 31. In addition, a drive structure 1 for driving the locking block 32 to slide is also installed on the support arm 31. The drive structure 1 includes a lead screw 33. The support arm 31 is internally machined into a hollow structure, and the lead screw 33 is rotatably installed inside the support arm 31 along its length. The outer end of the lead screw 33 extends out of the support arm 31 and is equipped with an adjusting handle. The locking block 32 has a threaded hole that engages with the lead screw 33. When the support arm 31 overlaps the steel bars 13 on both sides, rotating the adjusting handle causes the lead screw 33 to drive the locking block 32 to reciprocate linearly along the support arm 31. This lead screw drive has a self-locking characteristic, preventing the locking block 32 from loosening or dislodging during concrete pouring. The lower end of the locking block 32 is provided with a slot. By adjusting the position of the locking block 32, the slot can be made to tightly lock the reinforcing bar 13, thereby locking the base 2 and the reinforcing cage into a rigid whole and preventing the position from shifting due to impact during the pouring process.

[0035] like Figures 2-7As shown, the top of the base 2 has several limiting grooves 201 along its length to support the bent sections of the U-shaped steel strand 11. The positioning assembly includes two positioning plates 4 symmetrically hinged to the left and right side walls of the base 2. The positioning plates 4 have a recessed state where they are folded downwards to the bottom of the base 2 and a positioning state where they are flipped outwards relative to the side walls of the base 2. After casting, by folding the positioning plates 4 back, the lateral width of the positioning mechanism is made smaller than the gap width between the two vertical sections of the U-shaped steel strand 11, thus allowing the operator to directly remove the device from the pre-embedded U-shaped steel strand 11, achieving non-destructive demolding. Each positioning plate 4 has several receiving grooves 401 spaced along its length to accommodate the vertical sections of the U-shaped steel strand 11. The U-shaped steel strand 11 to be embedded is aligned and inserted from above the base 2. The vertical sections at both ends of the U-shaped steel strand 11 will pass through the receiving grooves 401 on the positioning plates 4 on both sides, until the bent section of the U-shaped steel strand 11 enters the limiting groove 201 at the top of the base 2. At this time, the middle part of the U-shaped steel strand 11 is restricted from front-to-back movement by the limiting groove 201, and the two ends are restricted from front-to-back and left-to-right movement by the receiving grooves 401, thus forming a preliminary positioning.

[0036] To ensure that the positioning plate 4 remains stably horizontal after being flipped and unfolded, and to prevent it from drooping excessively under gravity, an angle limiting structure (not shown in the figure) is provided between the positioning plate 4 and the base 2. Preferably, the angle limiting structure can be set as a folding support link. The folding support link is formed by hinged first link and second link. One end of the first link is hinged to the lower part of the side wall of the base 2, and one end of the second link is hinged to the bottom surface of the positioning plate 4. When the positioning plate 4 is retracted, the folding support link is folded and retracted to the side of the base 2. When the positioning plate 4 is flipped outward to a horizontal state, the folding support link is straightened and locked by a limiting pin, preventing the positioning plate 4 from flipping downward.

[0037] like Figures 3-6 As shown, a groove 21 is formed along the length of the top of the base 2. Several independently movable limiting blocks 22 are slidably installed in the groove 21. The limiting blocks 22 can slide along the groove 21 and lock. A limiting groove 201 is formed at the top of the limiting blocks 22. Preferably, the groove 21 is designed with a dovetail or T-shaped cross-section. The bottom of the limiting block 22 is provided with a slider structure that matches the cross-section of the groove 21, so that the limiting block 22 can only move along the length of the base 2 and cannot disengage. The side of the limiting block 22 is provided with a locking screw. When adjusted to a predetermined position, the screw is tightened to press against the inner wall of the groove 21, thereby achieving rigid locking of the limiting block 22.

[0038] In actual construction, operators can adjust the limiting blocks 22 on the base 2 so that the distance between two adjacent limiting grooves 201 is not equal to the distance between two adjacent receiving grooves 401. When the U-shaped steel strands 11 are placed into the positioning mechanism, due to the misalignment of the limiting grooves 201 and the receiving grooves 401 in the vertical projection direction, the adjacent U-shaped steel strands 11 no longer remain parallel to each other, but instead tilt slightly along the length of the I-beam 12, forming a specific geometric combination. For example, the bent sections of the two U-shaped steel strands 11 at both ends move away from each other, forming a structure that is wider at the top and narrower at the bottom; or the bent sections of the two U-shaped steel strands 11 at both ends move closer to each other, forming a structure that is narrower at the top and wider at the bottom. When the U-shaped steel strands 11 are poured into the concrete in an inclined state, a concrete cone similar to a "wedge" is formed between the adjacent U-shaped steel strands 11. When the U-shaped steel strand 11 is subjected to an upward hoisting force, the inclined U-shaped steel strand 11 will exert a lateral compressive force on the concrete encased within it, transforming the originally singular adhesive friction force into mechanical interlocking force and shear resistance. Compared to traditional vertical pre-embedding, this inclined pre-embedding method significantly increases the pull-out resistance of the U-shaped steel strand 11 in the concrete, effectively preventing the risk of the U-shaped steel strand 11 being directly pulled out and improving construction safety.

[0039] In some embodiments, the positioning plate 4 is preferably designed as a telescopic structure (not shown in the figure), including a main plate and a slidable sub-plate. One side of the main plate is hinged to the base 2, and the other side has a guide slot. The sub-plate is inserted into the main plate, and a receiving groove 401 is formed on the sub-plate. A locking screw is installed between the main plate and the sub-plate to lock the sub-plate after it extends a set length relative to the main plate. By adjusting the extension length of the sub-plate relative to the main plate, the lateral distance between the two positioning plates 4 can be changed, that is, the lateral distance between the two receiving grooves 401 can be adjusted, thereby accommodating U-shaped steel strands 11 with different opening widths. In addition, according to construction requirements, different sub-plates can be replaced to change the distance between two adjacent receiving grooves 401 to adapt to different pre-embedded layout requirements.

[0040] like Figures 3-6As shown, the receiving groove 401 is provided with a clamping member 5 for clamping and releasing the U-shaped steel strand 11. The clamping member 5 includes a fixed block 51 and a movable clamping block 52. The fixed block 51 is fixedly installed on one inner wall of the receiving groove 401, and the movable clamping block 52 is slidably installed in the receiving groove 401 and can move towards the fixed block 51 and lock, thereby forming a clamping channel between the movable clamping block 52 and the fixed block 51 for the vertical section of the U-shaped steel strand 11 to pass through. In addition, a second drive structure for driving the movable clamping block 52 to slide is also installed on the positioning plate 4. The second drive structure includes a second lead screw 53. Specifically, the interior of the positioning plate 4 is machined into a hollow structure, and the second lead screw 53 is rotatably installed inside the positioning plate 4 along the length direction of the positioning plate 4. The outer end of the second lead screw 53 extends out of the positioning plate 4 and is equipped with an adjustment handle. The movable clamping block 52 is provided with a threaded hole that is threadedly engaged with the second lead screw 53, and the movable clamping block 52 is threadedly engaged with the second lead screw 53 through the threaded hole.

[0041] like Figures 3-6 As shown, the movable clamping block 52 has a concave arc-shaped surface on the side facing the clamping channel, which is adapted to the U-shaped steel strand 11. The concave arc-shaped surface contacts the cylindrical steel strand, which increases the contact area compared to the line contact on a plane, thus significantly improving the clamping stability. The fixed block 51 has a rough structure on the side facing the clamping channel and on the concave arc-shaped surface. The rough structure can be a layer of diamond abrasive particles sprayed on the surface, which further improves the friction coefficient of the contact surface.

[0042] Based on the above-described device, the working process and working principle of the present invention are as follows: In the initial state, the operator rotates and retracts the support arm 31 of the fixing component 3 to a clearance position, while simultaneously folding the positioning plate 4 downwards to a stowed position. The operator holds the base 2 and vertically inserts it into the gap between two adjacent reinforcing bars 13 at the top of the I-beam 12. Once in place, the support arm 31 is unfolded and overlapped on the reinforcing bar 13, and the screw 1 33 is rotated to lock the reinforcing bar 13 using the locking block 32. Then, the positioning plate 4 is flipped up to a horizontal angle, completing the installation of the positioning mechanism. The pre-bent U-shaped steel strand 11 is placed from above the base 2, ensuring the middle bent section of the U-shaped steel strand 11 accurately falls into the limiting groove 201 of the base 2, while the two vertical sections of the U-shaped steel strand 11 are engaged in the receiving grooves 401 of the positioning plates 4 on both sides, providing physical isolation for each U-shaped steel strand 11. Then, the screw 2 53 is rotated, driving the movable clamping block 52 to clamp the vertical sections of the U-shaped steel strand 11. At this point, the base 2, positioning plate 4, and U-shaped steel strand 11 form a rigid truss structure, capable of resisting the impact force during concrete pouring and the vibration force during compaction. After the concrete pouring is completed and reaches the predetermined strength, the operator reverses the rotation of screw 2 53, causing the movable clamp 52 to retract and release the clamp on the U-shaped steel strand 11. Next, the positioning plate 4 is folded downwards to switch to the retracted state, and screw 1 33 is reversed to retract the support arm 31, causing the fixing member 3 to switch to the avoidance state. At this point, a demolding gap is formed between the positioning mechanism and the U-shaped steel strand 11. The operator only needs to pull the base 2 to one side to smoothly remove the entire device.

[0043] like Figures 1-7 As shown, the present invention also provides a construction method for hoisting an I-beam using the above-mentioned pre-embedded connection structure, specifically including the following steps: S1. Installation: Place the fixing part 3 in the clearance state and the positioning plate 4 in the storage state. At this time, the maximum lateral width of the positioning mechanism is less than the gap width between the two adjacent steel bars 13 at the top of the I-beam 12, so that the positioning mechanism can be inserted into the gap between the two steel bars 13. After it is in place, rotate the support arm 31 to a position perpendicular to the length direction of the base 2, so that the support arm 31 overlaps the steel bars 13 on both sides. That is, the fixing part 3 switches to the working state to fix the base 2. Then, flip the positioning plates 4 on both sides of the base 2 outward to the horizontal angle to switch it to the positioning state. S2. Installation: The U-shaped steel strand 11 to be pre-embedded is aligned and placed into the base 2 from above, so that the vertical sections at both ends of the U-shaped steel strand 11 pass through the receiving grooves 401 on the positioning plates 4 on both sides, until the bent section of the U-shaped steel strand 11 enters the limiting groove 201 at the top of the base 2. At this time, the middle part of the U-shaped steel strand 11 is restricted from front and back displacement by the limiting groove 201, and the two ends are restricted from front, back and left and right displacement by the receiving grooves 401, forming a preliminary positioning and providing a forced physical isolation for each U-shaped steel strand 11, ensuring that the adjacent U-shaped steel strands 11 always maintain a preset distance, and avoiding the problem of adjacent steel strands sticking together due to pressure. S3. Clamping: After the U-shaped steel strand 11 is laid out, the vertical section of the U-shaped steel strand 11 is clamped and fixed by the clamping device 5. S4. Casting: Cast the I-beam 12. After casting is completed and the predetermined strength is reached, release the clamping member 5 from the U-shaped steel strand 11, flip the positioning plate 4 in the reverse to the storage state, and switch the fixing member 3 to the avoidance state. At this time, the maximum lateral width of the positioning mechanism is less than the gap width between the two vertical sections of the U-shaped steel strand 11, so that the positioning mechanism can be withdrawn from the pre-embedded U-shaped steel strand 11 to complete the construction.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pre-embedded connection structure for hoisting I-beams, comprising U-shaped steel strands (11), characterized in that, It also includes a positioning mechanism for assisting the positioning and pre-embedding of the U-shaped steel strand (11), the positioning mechanism including a base (2), a fixing part (3) and a positioning component; The top of the base (2) is provided with several limiting grooves (201) along its length for supporting the bent section of the U-shaped steel strand (11). The fixing member (3) is rotatably installed at the front and rear ends of the base (2). The fixing member (3) has a working state that can fix the base (2) between two adjacent steel bars (13) at the top of the I-beam (12), and a clearance state that can remove the base (2) outward from between two adjacent steel bars (13). The positioning assembly includes two positioning plates (4) respectively hinged to the left and right side walls of the base (2). The positioning plates (4) have a downward-folding function. In the storage state at the bottom of the base (2) and the positioning state that is flipped outward relative to the side wall of the base (2), each positioning plate (4) has several receiving grooves (401) spaced apart along its length to accommodate the vertical section of the U-shaped steel strand (11). The receiving groove (401) is provided with clamping member (5) for clamping and releasing the U-shaped steel strand (11). When the fixing member (3) is in the avoidance state and the positioning plate (4) is in the storage state, the maximum lateral width of the positioning mechanism is less than the gap width between the two vertical sections of the U-shaped steel strand (11).

2. The embedded connection structure for hoisting I-beams according to claim 1, characterized in that, The top of the base (2) is provided with a sliding groove (21) along its length direction. Several independently movable limiting blocks (22) are slidably installed in the sliding groove (21). The limiting blocks (22) can slide along the sliding groove (21) and lock. The limiting groove (201) is opened at the top of the limiting block (22).

3. The embedded connection structure for hoisting I-beams according to claim 1, characterized in that, The fastener (3) includes four support arms (31) and four locking blocks (32). The four support arms (31) are in pairs and are respectively hinged to the front and rear ends of the base (2) and can rotate in the horizontal plane around the hinge axis. The locking blocks (32) are installed at the lower end of the support arms (31) and can slide and lock along the length direction of the support arms (31). When the fastener (3) is in the working state, the support arms (31) rotate to a position perpendicular to the length direction of the base (2) so that the support arms (31) can overlap the steel bars (13) on both sides. At this time, the locking blocks (32) slide along the support arms (31) to lock onto the steel bars (13). When the fastener (3) is in the avoidance state, the support arms (31) rotate to a position parallel to the length direction of the base (2) so that the support arms (31) can be stored on the end extension line of the base (2).

4. The embedded connection structure for hoisting I-beams according to claim 1, characterized in that, The clamping member (5) includes a fixed block (51) and a movable clamping block (52) disposed inside the receiving groove (401). The fixed block (51) is fixedly installed on one side inner wall of the receiving groove (401), and the movable clamping block (52) is slidably installed in the receiving groove (401) and can move towards the fixed block (51) and lock. A clamping channel for passing through the vertical section of the U-shaped steel strand (11) is formed between the movable clamping block (52) and the fixed block (51).

5. The embedded connection structure for hoisting I-beams according to claim 3, characterized in that, The support arm (31) is also equipped with a drive structure for driving the locking block (32) to slide. The drive structure includes a lead screw (33), which is rotatably installed in the support arm (31) along the length of the support arm (31). An adjustment handle is installed at the end of the lead screw (33) away from the base (2). The locking block (32) is provided with a threaded hole that is threaded to the lead screw (33).

6. The embedded connection structure for hoisting I-beams according to claim 4, characterized in that, The positioning plate (4) is also equipped with a second drive structure for driving the movable clamping block (52) to slide. The second drive structure includes a second lead screw (53). The second lead screw (53) is rotatably installed in the positioning plate (4) along the length direction of the positioning plate (4). One end of the second lead screw (53) passes through the positioning plate (4) and is equipped with an adjustment handle. The movable clamping block (52) is provided with a threaded hole that is threadedly engaged with the second lead screw (53).

7. The embedded connection structure for hoisting I-beams according to claim 1, characterized in that, The positioning plate (4) is a telescopic structure, which allows the width of the positioning plate (4) to be adjusted, thereby adjusting the lateral spacing between the two side receiving slots (401) to accommodate U-shaped steel strands (11) with different opening widths.

8. The embedded connection structure for hoisting I-beams according to claim 4, characterized in that, The movable clamping block (52) has a concave arc-shaped surface on the side facing the clamping channel that is compatible with the U-shaped steel strand (11).

9. The embedded connection structure for hoisting I-beams according to claim 8, characterized in that, The fixed block (51) facing the clamping channel and the concave arc surface of the movable clamping block (52) are both provided with rough structures.

10. A construction method for hoisting I-beams, characterized in that, The embedded connection structure for hoisting an I-beam according to any one of claims 1-9 comprises the following steps: S1. Installation: Place the fastener (3) in the clearance state and the positioning plate (4) in the storage state. Insert the positioning mechanism into the gap between the two adjacent steel bars (13) at the top of the I-beam (12). Then switch the fastener (3) to the working state to fix the base (2) and flip the positioning plates (4) on both sides of the base (2) outward to switch it to the positioning state. S2, Layout: Place the U-shaped steel strand (11) to be embedded from above the base (2), so that the vertical sections at both ends of the U-shaped steel strand (11) pass through the receiving grooves (401) on the positioning plates (4) on both sides, until the bent section of the U-shaped steel strand (11) enters the limiting groove (201) at the top of the base (2); S3. Clamping: After all the U-shaped steel strands (11) are laid out, the vertical section of the U-shaped steel strands (11) is clamped and fixed by clamping device (5); S4. Casting: Cast the I-beam (12). After the casting is completed and the predetermined strength is reached, release the clamping member (5) from the U-shaped steel strand (11), flip the positioning plate (4) in the opposite direction to the storage state, switch the fixing member (3) to the avoidance state, and then remove the positioning mechanism from the U-shaped steel strand (11) that has been pre-embedded.

Images