A tensioning assembly for precast bridge slabs

Abstract

This invention relates to the field of bridge tensioning technology, specifically to a tensioning assembly for precast bridge slabs. It includes a tensioning assembly body, which comprises a corrugated tube disposed within the precast bridge slab, a steel strand disposed within the corrugated tube, a fixing mechanism located at one end of the corrugated tube and cooperating with one end of the steel strand, and a tensioning mechanism located at the other end of the corrugated tube and cooperating with the other end of the steel strand. The tensioning mechanism has a locking member, a traction member, and a driving member. The locking member is used to lock the steel strand in an unlockable manner, the traction member is used to tighten the steel strand, and the driving member is used to cooperate simultaneously with the locking member and the traction member to achieve outward tensioning of the steel strand. Through this, construction personnel can apply prestress to small precast bridge slabs during manufacturing using the tensioning assembly, thereby improving the tensile strength of small precast bridge slabs under load, thus better enabling the expansion of applications for manufacturing small precast bridge slabs.

Description

Technical Field

[0001] This invention relates to the field of bridge tensioning technology, and more specifically, to a tensioning assembly for precast bridge slabs. Background Technology

[0002] In some major construction projects, precast components such as precast bridge slabs are often required. Since the bridge itself is resistant to compression, construction workers usually use tensioning devices to tension the precast bridge slabs during manufacturing to give them an upward prestress. When vehicles drive on the bridge, the prestress can offset some of the weight of the vehicles, thus making the bridge more robust.

[0003] Because precast bridge slabs used in some major construction projects are generally large, the tensioning devices used are also large and expensive. However, for precast bridge slabs used in some small construction projects, the larger tensioning devices are generally not suitable for the small precast bridge slabs. Therefore, considering the cost and construction period, construction workers generally do not apply prestress to small precast bridge slabs. This makes the tensile strength of small precast bridge slabs poor when bearing loads, thus narrowing the range of applicable scenarios. Summary of the Invention

[0004] The present invention provides a tensioning assembly for precast bridge slabs, which can overcome some or all of the defects of the prior art.

[0005] A tensioning assembly for precast bridge slabs includes a tensioning assembly body, the tensioning assembly body including a corrugated pipe disposed within the precast bridge slab, a steel strand disposed within the corrugated pipe, a fixing mechanism disposed at one end of the corrugated pipe and used to cooperate with one end of the steel strand, and a tensioning mechanism disposed at the other end of the corrugated pipe and used to cooperate with the other end of the steel strand.

[0006] The tensioning mechanism has a locking component, a traction component, and a driving component. The locking component is used to lock the steel strand in an unlockable manner, the traction component is used to tighten the steel strand, and the driving component is used to cooperate with the locking component and the traction component to achieve outward tensioning of the steel strand.

[0007] Based on the scenario of some small-scale construction projects, in this invention, when construction workers manufacture precast bridge slabs, they can apply prestress to the small precast bridge slabs through tensioning components, thereby improving the tensile strength of the small precast bridge slabs when bearing loads, thus better realizing the adaptability of expanding the manufacturing of small precast bridge slabs.

[0008] Specifically, when construction workers use the tensioning assembly provided by this invention to tension the precast bridge slabs during the manufacturing process, they can adopt two tensioning methods depending on the actual construction conditions.

[0009] If a pre-tensioning method is adopted, firstly, a steel reinforcement cage is placed at the precast bridge slab mold; then, one or more tensioning components are arranged at the steel reinforcement cage, and the corrugated pipe, fixing mechanism, and tensioning mechanism are respectively installed and fixed at predetermined positions at the steel reinforcement cage; next, multiple steel strands are inserted into the corrugated pipe, so that the fixing mechanism fixes one end of the multiple steel strands, and the tensioning mechanism tensions the other end of the multiple steel strands; after tensioning is completed, grout is injected into the precast bridge slab mold to form the concrete bridge slab body, and grout is injected into the corrugated pipe to form a grout body; when the bridge slab body reaches the specified strength, the precast bridge slab mold is removed, and excess steel strands at both ends of the bridge slab body are cut off with pliers. Finally, the fixing mechanism and tensioning mechanism at both ends of the bridge slab body are buried and sealed, thereby tensioning the small precast bridge slab, thereby improving the tensile strength of the small precast bridge slab when bearing load, and better realizing that the manufactured precast bridge slab can be adapted to a wider range of scenarios;

[0010] If a post-tensioning method is adopted, firstly, a reinforcing steel skeleton is placed at the precast bridge slab mold; then, one or more tensioning components are arranged at the reinforcing steel skeleton, and the corrugated pipe, fixing mechanism, and tensioning mechanism are respectively installed and fixed at predetermined positions at the reinforcing steel skeleton; next, grout is injected into the precast bridge slab mold to form the main body of the concrete bridge slab; when the main body of the bridge slab reaches the specified strength, the precast bridge slab mold is removed, and multiple steel strands are inserted into the corrugated pipe, so that the fixing mechanism fixes one end of the multiple steel strands, and the tensioning mechanism tensions the other end of the multiple steel strands; after tensioning is completed, grout is injected into the corrugated pipe to form a grout body; when the grout body in the corrugated pipe reaches the specified strength, the excess steel strands at both ends of the main body of the bridge slab are cut off with pliers; finally, the fixing mechanism and tensioning mechanism at both ends of the main body of the bridge slab are buried and sealed, thus achieving better tensioning of small precast bridge slabs.

[0011] Preferably, a first mounting housing is provided at one end of the corrugated pipe, and a first mounting cavity communicating with the inner cavity of the corrugated pipe is formed at the first mounting housing. The opening of the first mounting cavity is located on the side away from the corrugated pipe. The fixing mechanism includes a fixing plate located at the bottom wall of the first mounting cavity. Multiple first tightening holes are formed on the side of the fixing plate away from the corrugated pipe and are distributed in a circular manner. Multiple steel strands are arranged in a circular manner inside the corrugated pipe. The corresponding parts of the multiple steel strands pass through the first tightening holes respectively. Each first tightening hole is provided with a first tightening member for fixing the steel strand.

[0012] With the above structure, the fixing plate is installed at the bottom wall of the first mounting cavity to seal the bellows; and the corresponding parts of the plurality of steel strands pass through the first tightening hole respectively, and the first tightening member fixes the corresponding part of the corresponding steel strand to the fixing plate so that the tensioning mechanism can tension the plurality of steel strands.

[0013] Preferably, the diameter of the first tightening hole gradually increases from the bottom wall of the first mounting cavity toward the opening of the first mounting cavity. The first tightening member includes two mutually cooperating first tightening parts, and the corresponding part of the steel strand is fitted between the two first tightening parts. When the two first tightening parts are mutually cooperating, they are in the shape of a frustum, and the frustum shape is used to cooperate with the first tightening hole. The two first tightening parts are connected and cooperated by an elastic ring.

[0014] With the above structure, the two first tightening parts tighten the corresponding parts of the steel strand, thereby better fixing the corresponding parts of the steel strand to the fixed plate; wherein, when the tensioning mechanism tensions the steel strand, the outer walls of the two first tightening parts can abut against the inner wall of the first tightening hole, thus better tightening the corresponding parts of the steel strand by the first tightening parts, thereby facilitating the tensioning mechanism to tension multiple steel strands.

[0015] Preferably, a second mounting housing is provided at the other end of the bellows, and a stepped cavity communicating with the inner cavity of the bellows is formed at the second mounting housing. The opening of the stepped cavity is located away from the other end of the bellows. The stepped cavity includes a second mounting cavity and a third mounting cavity formed sequentially towards the opening side of the stepped cavity. The cross-sectional area of ​​the second mounting cavity is smaller than that of the third mounting cavity. A locking member is provided at the second mounting cavity, a traction member is slidably provided at the third mounting cavity, and a driving member is provided at the opening of the stepped cavity. Multiple steel strands are provided in the bellows and are circumferentially distributed. The corresponding parts of the multiple steel strands extend into the stepped cavity.

[0016] With the above structure, the locking member, traction member and driving member are better installed at the second mounting housing; wherein, the inner wall of the third mounting cavity cooperates with the traction member so that the traction member can slide stably in the third mounting cavity when the steel strand is tensioned by the driving member.

[0017] Preferably, the locking component includes a locking block installed on the bottom wall of the second mounting cavity, the locking block having a plurality of circumferentially distributed through holes, the corresponding portions of the plurality of steel strands passing through the through holes; a locking cavity is formed in the middle of the locking block, the opening of the locking cavity being located on the side of the locking block away from the bottom wall of the second mounting cavity;

[0018] The axial direction of the locking cavity is parallel to the axial direction of multiple through holes. Multiple locking channels are provided between the locking cavity and each through hole and are arranged linearly along the axis of the locking cavity. The locking channels include a locking head channel for connecting the through holes and a locking tail channel for connecting the locking cavity. A locking part is provided at the locking channel. The locking part includes a locking head block that moves in the locking head channel and a locking tail block that moves in the locking tail channel. A compression spring is provided in the locking tail channel. The compression spring is used to maintain the tendency of the locking tail block to move toward the locking cavity.

[0019] A rotating block is rotatably provided inside the locking cavity. The rotating block is used to cooperate with the locking part so that the lock head block extends into the through hole and is used to lock and unlock the corresponding part of the steel strand.

[0020] With the above structure, when the driving component cooperates with the locking component, the rotating block rotates within the locking cavity. The forward or reverse rotation of the rotating block allows the locking part at the locking channel to lock the corresponding part of the steel strand. Specifically, when the rotating block rotates forward to a certain angle, it acts on the locking part, causing the locking head block to extend from the locking head channel into the through hole, thus squeezing and locking the corresponding part of the steel strand. When the rotating block rotates in the reverse direction to a certain angle, it does not act on the locking part. At this time, the locking tail block, under the action of the compression spring, drives the locking head block back to the locking head channel, releasing the squeezing and locking of the steel strand. This makes it more convenient for construction personnel to tension the steel strand. Furthermore, the locking component provides a pre-positioning effect. Before the driving component and the traction component cooperate, a wrench can be used to engage with the rotating block to keep the steel strand inside the corrugated pipe taut, facilitating the traction of the steel strand by the traction component.

[0021] Preferably, a locking sleeve is provided on the inner wall of the locking cavity, and the rotating block is rotatably disposed in the locking sleeve; a limiting cavity is provided on the bottom wall of the locking cavity, and a limiting block extending into the limiting cavity is provided on the corresponding side of the outer wall of the locking sleeve;

[0022] The outer wall of the locking sleeve is provided with multiple locking holes that connect to the inner cavity of the locking sleeve. The locking tail channel is connected to the locking cavity through the locking holes. A locking tail portion extending from the locking channel into the locking cavity is formed on the side wall of the locking tail block. A mating portion is formed at one end of the locking tail portion that extends into the locking cavity. The mating portion has a mating surface. The outer wall of the rotating block is provided with a mating channel for mating with the mating surface at each locking tail portion. When the mating portion is located at one end of the mating channel, the corresponding portion of the locking head block extends into the through hole. When the mating portion is located at the other end of the mating channel, the corresponding portion of the locking head block does not extend into the through hole. A first slot and a second slot are formed at both ends of the mating channel for mating with the corresponding side of the mating portion.

[0023] A locking cover is provided on the side of the locking block away from the bottom wall of the second mounting cavity. The inner side of the locking cover near the rotating block has a stop part that extends into the locking cavity and abuts against the end wall of the locking sleeve. A mating port is provided at the middle of the outer side of the locking cover, and a rotating hole is provided at the middle of the mating port. A locking hole is formed on the end wall side of the rotating block corresponding to the rotating hole. The mating port and the locking hole are used to mate with the driving component.

[0024] With the above structure, in order to facilitate the installation of the locking part at the locking channel, a locking sleeve is provided at the locking cavity. The locking sleeve is installed in the locking cavity through the cooperation of the limiting block and the limiting cavity, so as to prevent the locking part from being separated from the locking channel during installation.

[0025] When the rotating block rotates forward to a certain angle, the mating part slides to the first slot at the mating channel. At this time, the locking block extends from the locking channel into the through hole and squeezes and locks the corresponding part of the steel strand. When the rotating block rotates in the opposite direction to a certain angle, the mating part slides to the second slot at the mating channel. At this time, the locking tail block, under the action of the compression spring, drives the locking block to retract into the locking channel and simultaneously releases the squeezing and locking of the corresponding part of the steel strand. The first and second slots are mated on the corresponding sides of the mating part, maintaining the current state of the locking member when the rotating block does not rotate, thereby better realizing the locking member can unlockably lock the steel strand. The abutment part is provided so that it can abut against the end wall of the locking sleeve to fix the locking sleeve in the locking cavity.

[0026] Preferably, the traction component includes a traction plate slidably disposed on the bottom wall of the third mounting cavity. A mating hole is provided in the middle of the traction plate for mating with a driving component. Multiple second tightening holes are formed on the side wall of the traction plate away from the third mounting cavity, arranged circumferentially. The other ends of the multiple steel strands respectively pass through the second tightening holes. The diameter of the second tightening holes gradually increases from the bottom wall of the third mounting cavity towards the stepped cavity opening. Each second tightening hole is provided with a second tightening element for fixing the steel strand. The second tightening element includes two mating second tightening portions, with corresponding portions of the steel strand mating between the two second tightening portions. The two second tightening portions form a frustum shape when mated, and this frustum shape is used to mate with the second tightening holes. The two second tightening portions are connected by an elastic ring.

[0027] With the above structure, before tensioning the steel strand, the traction plate passes the corresponding part of the steel strand through the corresponding second tightening hole, so that the two second tightening parts tighten the corresponding part of the steel strand. Thus, when the driving member cooperates with the traction plate, that is, during the tensioning process of the corresponding part of the steel strand, the outer wall of the two second tightening parts can abut against the inner wall of the second tightening hole. Therefore, the traction plate tightens the corresponding part of the steel strand better, thereby better achieving the tensioning of the corresponding part of the steel strand by the traction plate and the driving member.

[0028] Preferably, a scale line is provided on one side wall of the third mounting cavity. The extension direction of the scale line is consistent with the movement direction of the traction plate, and the starting scale line is located on the side of the traction plate away from the bottom wall of the third mounting cavity when the traction plate is located at the bottom wall of the third mounting cavity.

[0029] With the above structure, construction workers can observe the movement distance of the traction plate in the third installation cavity, and thus determine the magnitude of the tension; wherein, the relationship between the tensioning distance of the steel strand and the magnitude of the tension is determined according to existing formulas.

[0030] Preferably, the driving component includes two rotatable outer rods and an inner rod that rotate independently. The outer rods have a shaft cavity formed along the axial direction, and the inner rods are rotatably disposed in the shaft cavity through multiple bearings. A first driving disk is provided at the end of the outer rod away from the stepped cavity opening, and both ends of the inner rod extend into the ends of the shaft cavity. A second driving disk is provided at the end of the inner rod near the first driving disk. A locking block is provided at the end of the inner rod away from the second driving disk, and the locking block is used to cooperate with the locking hole.

[0031] With the above structure, the construction personnel install the drive unit in the stepped cavity, so that the locking block at the inner rod extends into the locking hole of the rotating block. The construction personnel rotate the second drive disc, thus better realizing the rotation of the rotating block in the locking cavity, thereby realizing the compression and locking or release of the compression and locking of the steel strand by the locking part.

[0032] Preferably, the driving component includes two rotatable outer rods and an inner rod, which rotate independently of each other. The outer rods have a shaft cavity formed along the axial direction, and the inner rods are rotatably disposed in the shaft cavity through multiple bearings. A first driving disk is provided at the end of the outer rod away from the opening of the stepped cavity, and both ends of the inner rod extend into the ends of the shaft cavity. A second driving disk is provided at the end of the inner rod near the first driving disk. A lead screw nut is provided at the mating hole, and an external helix is ​​formed on the outer wall of the outer rod for mating with the lead screw nut. The end of the outer rod away from the first driving disk is used to abut against the locking component.

[0033] With the above structure, the construction personnel first place the corresponding end of the outer rod against the mating hole of the locking part, and then drive the first drive disc, so that the traction plate slides in the third mounting cavity under the action of the outer rod rotation, thus better realizing the tensioning of the corresponding part of the steel strand by the traction plate. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the main body of the tensioning component in Example 1.

[0035] Figure 2 This is a schematic diagram of the main body of the tensioning component from another perspective in Example 1.

[0036] Figure 3 This is a schematic diagram of the structure of the first mounting housing in Example 1.

[0037] Figure 4 This is a schematic diagram of the structure of the fixing plate in Example 1.

[0038] Figure 5 This is a schematic diagram of the structure of the first tightening member in Example 1.

[0039] Figure 6 This is an exploded view of the first tightening member in Example 1.

[0040] Figure 7 This is a schematic diagram of the structure of the second mounting housing in Example 1.

[0041] Figure 8 This is a cross-sectional schematic diagram of the second mounting housing in Embodiment 1.

[0042] Figure 9 This is a partial structural diagram of the first mounting housing in Example 1.

[0043] Figure 10 This is a schematic diagram of the locking component in Example 1.

[0044] Figure 11 This is an exploded view of the locking component in Example 1.

[0045] Figure 12 This is an exploded view of the locking component in Example 1 from another perspective.

[0046] Figure 13 This is a cross-sectional schematic diagram of the locking component in Example 1.

[0047] Figure 14 This is a schematic diagram of the locking block in Example 1.

[0048] Figure 15 This is a schematic diagram of the locking sleeve in Example 1.

[0049] Figure 16 This is a schematic diagram of the rotating block in Example 1.

[0050] Figure 17 This is a schematic diagram of the locking part in Example 1.

[0051] Figure 18 This is a schematic diagram of the traction plate in Example 1.

[0052] Figure 19 This is a schematic diagram of the traction plate in Example 1.

[0053] Figure 20 This is a schematic diagram of the structure of the second tightening member in Example 1.

[0054] Figure 21 This is an exploded view of the second tightening member in Example 1.

[0055] Figure 22 This is a schematic diagram of the drive component in Example 1.

[0056] Figure 23 This is a cross-sectional schematic diagram of the driving component in Example 1.

[0057] Figure 24 This is a schematic flowchart of a prefabricated bridge slab manufacturing method in Example 3. Detailed Implementation

[0058] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0059] Example 1

[0060] like Figure 1-23 As shown, this embodiment provides a tensioning assembly for precast bridge slabs, which includes a tensioning assembly body 100. The tensioning assembly body 100 includes a corrugated pipe 110 disposed in the precast bridge slab, a steel strand 120 disposed in the corrugated pipe 110, a fixing mechanism 130 disposed at one end of the corrugated pipe 110 and used to cooperate with one end of the steel strand 120, and a tensioning mechanism 140 disposed at the other end of the corrugated pipe 110 and used to cooperate with the other end of the steel strand 120.

[0061] The tensioning mechanism 140 has a locking member 830, a traction member 840, and a driving member 850. The locking member 830 is used to lock the steel strand 120 in an unlockable manner, and the traction member 840 is used to tighten the steel strand 120. The driving member 850 is used to cooperate with the locking member 830 and the traction member 840 at the same time to realize the outward tensioning of the steel strand 120.

[0062] Based on the scenario of some small-scale construction projects, in this embodiment, when the construction workers are manufacturing precast bridge slabs, they can apply prestress to the small precast bridge slabs through the tensioning component, thereby improving the tensile strength of the small precast bridge slabs when bearing loads, thus better realizing the adaptability of expanding the manufacturing of small precast bridge slabs.

[0063] Specifically, when construction workers use the tensioning assembly provided in this embodiment to tension the precast bridge slabs during the manufacturing process, they can adopt two tensioning methods depending on the actual construction conditions.

[0064] If a pre-tensioning method is adopted, firstly, a reinforcing steel cage is placed at the precast bridge slab mold; then, one or more tensioning components are arranged at the reinforcing steel cage, and the corrugated pipe 110, fixing mechanism 130, and tensioning mechanism 140 are respectively installed and fixed at predetermined positions at the reinforcing steel cage; next, multiple steel strands 120 are inserted into the corrugated pipe 110, so that the fixing mechanism 130 fixes one end of the multiple steel strands 120, and the tensioning mechanism 140 tensions the other end of the multiple steel strands 120; after tensioning is completed, the precast bridge slab is then tensioned. Grouting is injected into the mold to form the main body of the concrete bridge slab and grouting is injected into the corrugated pipe 110 to form a grout body; when the main body of the bridge slab reaches the specified strength, the precast bridge slab mold is removed, and the excess steel strands 120 at both ends of the main body of the bridge slab are cut off with pliers. Finally, the fixing mechanism 130 and tensioning mechanism 140 at both ends of the main body of the bridge slab are buried and sealed, thereby tensioning the small precast bridge slab, thereby improving the tensile strength of the small precast bridge slab when bearing load, and better realizing that the manufactured precast bridge slab can be adapted to a wider range of scenarios.

[0065] If post-tensioning is used, firstly, a reinforcing steel frame is placed at the precast bridge slab mold; then, one or more tensioning components are arranged at the reinforcing steel frame, and the corrugated pipe 110, fixing mechanism 130, and tensioning mechanism 140 are respectively installed and fixed at predetermined positions at the reinforcing steel frame; next, grout is injected into the precast bridge slab mold to form the main body of the concrete bridge slab; when the main body of the bridge slab reaches the specified strength, the precast bridge slab mold is removed, and multiple steel strands 120 are inserted into the corrugated pipe 110, so that the fixing mechanism... 130 Fix one end of the plurality of steel strands 120 so that the tensioning mechanism 140 tensions the other end of the plurality of steel strands 120; After tensioning is completed, grout is injected into the corrugated pipe 110 to form a grout body; when the grout body in the corrugated pipe 110 reaches the specified strength, the excess steel strands 120 at both ends of the bridge slab body are cut off with pliers; finally, the fixing mechanism 130 and the tensioning mechanism 140 at both ends of the bridge slab body are buried and sealed, thus achieving better tensioning of small precast bridge slabs;

[0066] In the tensioning mechanism 140, the construction personnel first use the locking device 830 to lock the steel strand 120. In order to achieve a better tensioning effect of the tensioning mechanism 140, the steel strand 120 should be in a taut state inside the corrugated pipe 110 before tensioning. After the locking device 830 locks the steel strand 120, the traction device 840 is used to tighten the steel strand 120. Then, the driving device 850 is used in conjunction with the locking device 830 to release the locking device 830 from the steel strand 120. Finally, the driving device 850 is used in conjunction with the traction device 840 to tension the steel strand 120 at the traction device 840.

[0067] In this embodiment, the tensioning mechanism 140 is provided with a grouting port 740 that connects to the inner cavity of the corrugated pipe 110, and the fixing mechanism 130 is provided with a grouting outlet 350 that connects to the inner cavity of the corrugated pipe 110; the grouting port 740 and the grouting outlet 350 are used to cooperate with the grouting assembly to form a grouting body by grouting in the inner cavity of the corrugated pipe 110.

[0068] With the above structure, grouting is better achieved in the inner cavity of the bellows 110 and a grout body is formed.

[0069] In this embodiment, a first mounting housing 310 is provided at one end of the corrugated pipe 110, and a first mounting cavity 320 communicating with the inner cavity of the corrugated pipe 110 is formed at the first mounting housing 310. The opening of the first mounting cavity 320 is located on the side away from the corrugated pipe 110. The fixing mechanism 130 includes a fixing plate 330 located at the bottom wall of the first mounting cavity 320. A plurality of first tightening holes 410 are formed on the side of the fixing plate 330 away from the corrugated pipe 110 and are distributed in a circular pattern. A plurality of steel strands 120 are provided in the corrugated pipe 110 and are distributed in a circular pattern. The corresponding parts of the plurality of steel strands 120 respectively pass through the first tightening holes 410. Each first tightening hole 410 is provided with a first tightening member 340 for fixing the steel strands 120.

[0070] With the above structure, the fixing plate 330 is installed on the bottom wall of the first mounting cavity 320 to seal the corrugated pipe 110; and the corresponding parts of the plurality of steel strands 120 respectively pass through the first tightening hole 410, and the first tightening member 340 fixes the corresponding part of the corresponding steel strand 120 to the fixing plate 330 so that the tensioning mechanism 140 can tension the plurality of steel strands 120.

[0071] In this embodiment, the diameter of the first tightening hole 410 gradually increases from the bottom wall of the first mounting cavity 320 toward the opening of the first mounting cavity 320. The first tightening member 340 includes two mutually cooperating first tightening parts 610, and the corresponding part of the steel strand 120 is fitted between the two first tightening parts 610. When the two first tightening parts 610 are mutually cooperating, they are in the shape of a frustum, which is used to cooperate with the first tightening hole 410. The two first tightening parts 610 are connected and cooperated by an elastic ring 620.

[0072] With the above structure, the two first tightening parts 610 tighten the corresponding parts of the steel strand 120, thereby preferably fixing the corresponding parts of the steel strand 120 to the fixing plate 330; wherein, when the tensioning mechanism 140 tensions the steel strand 120, the outer walls of the two first tightening parts 610 can abut against the inner wall of the first tightening hole 410, thus preferably tightening the corresponding parts of the steel strand 120 by the first tightening member 340, thereby facilitating the tensioning mechanism 140 to tension multiple steel strands 120.

[0073] In this embodiment, a second mounting housing 710 is provided at the other end of the bellows 110. A stepped cavity 720 communicating with the inner cavity of the bellows 110 is formed at the second mounting housing 710. The opening of the stepped cavity 720 is located away from the other end of the bellows 110. The stepped cavity 720 includes a second mounting cavity 810 and a third mounting cavity 820 formed sequentially towards the opening side of the stepped cavity 720. The cross-sectional area of ​​the second mounting cavity 810 is smaller than the cross-sectional area of ​​the third mounting cavity 820. A locking member 830 is provided at the second mounting cavity 810, a traction member 840 is slidably provided at the third mounting cavity 820, and a driving member 850 is provided at the opening of the stepped cavity 720. Multiple steel strands 120 are provided in the bellows 110 and are circumferentially distributed. The corresponding parts of the multiple steel strands 120 extend into the stepped cavity 720.

[0074] With the above structure, the locking member 830, the traction member 840 and the driving member 850 are better installed at the second mounting housing 710; wherein, the inner wall of the third mounting cavity 820 cooperates with the outer wall of the traction member 840 so that the traction member 840 can slide stably in the third mounting cavity 820 when the steel strand 120 is tensioned under the action of the driving member 850.

[0075] In this embodiment, the locking member 830 includes a locking block 1010 installed on the bottom wall of the second mounting cavity 810. The locking block 1010 has a plurality of through holes 1030 arranged in a circular pattern, and the corresponding portions of the plurality of steel strands 120 pass through the through holes 1030. A locking cavity 1110 is formed in the middle of the locking block 1010, and the opening of the locking cavity 1110 is located on the side of the locking block 1010 away from the bottom wall of the second mounting cavity 810.

[0076] The axial direction of the locking cavity 1110 is parallel to the axial direction of the multiple through holes 1030. Multiple locking channels are provided between the locking cavity 1110 and each through hole 1030 and are arranged linearly along the axis of the locking cavity 1110. The locking channel includes a locking head channel 1310 for connecting the through hole 1030 and a locking tail channel 1320 for connecting the locking cavity 1110. A locking part is provided at the locking channel. The locking part includes a locking head block 1330 that moves in the locking head channel 1310 and a locking tail block 1340 that moves in the locking tail channel 1320. A compression spring 1350 is provided in the locking tail channel 1320. The compression spring 1350 is used to maintain the tendency of the locking tail block 1340 to move toward the locking cavity 1110.

[0077] A rotating block 1130 is rotatably provided inside the locking cavity 1110. The rotating block 1130 is used to cooperate with the locking part so that the locking head block 1330 extends into the through hole 1030 and is used to lock the corresponding part of the steel strand 120.

[0078] With the above structure, when the driving member 850 cooperates with the locking member 830, the rotating block 1130 rotates within the locking cavity 1110. The forward or reverse rotation of the rotating block 1130 allows the locking portion at the locking channel to lock the corresponding portion of the steel strand 120. Specifically, when the rotating block 1130 rotates forward to a certain angle, it acts on the locking portion, allowing the lock head block 1330 to extend from the lock head channel 1310 into the through hole 1030, thus pressing and locking the corresponding portion of the steel strand 120. When the rotating block 1130 rotates in the reverse direction to a certain angle, the rotating block... When 1130 is not applied to the locking part, the locking tail block 1340, under the action of the compression spring 1350, drives the locking head block 1330 to retract into the locking head channel 1310, so that the locking head block 1330 releases the compression and locking of the steel strand 120. This makes it more convenient for construction personnel to tension the steel strand 120. In addition, the locking part 830 can play a pre-positioning role. Before the driving part 850 and the traction part 840 are engaged, the wrench can be used to engage with the rotating block 1130 to keep the steel strand 120 in the corrugated pipe 110 taut, so that the traction part 840 can pull the steel strand 120.

[0079] Wherein, without affecting the toughness of the steel strand 120 and without affecting the tensioning of the steel strand 120 at the through hole 1030, a barb structure is uniformly provided on the inner wall of the through hole 1030 along the axial direction of the barb structure through hole 1030. The tips of the barb structure point to the tensioning direction of the steel strand 120. The locking block 1330 cooperates with the barb structure, so that the locking block 1330 can better squeeze and lock the steel strand 120 at the through hole 1030.

[0080] The locking member 830 has an installation hole on its outer wall, and the second mounting cavity 810 has a threaded post 910 on its bottom wall for the installation hole to pass through. The locking member 830 is installed on the bottom wall of the second mounting cavity 810 by bolts and bolt post thread engagement. The locking block 1010 seals the inner cavity of the bellows 110 on the corresponding side, and the corresponding side wall forms a sealing part 1011 that extends into the inner cavity of the bellows 110. The outer wall of the sealing part 1011 fits the inner wall of the bellows 110 to avoid grout leakage when grout is injected into the inner cavity of the bellows 110.

[0081] In this embodiment, a locking sleeve 1120 is provided on the inner wall of the locking cavity 1110, and a rotating block 1130 is rotatably disposed in the locking sleeve 1120; a limiting cavity 1410 is provided on the bottom wall of the locking cavity 1110, and a limiting block 1520 extending into the limiting cavity 1410 is provided on the corresponding side of the outer wall of the locking sleeve 1120.

[0082] The outer wall of the locking sleeve 1120 is provided with multiple locking holes 1510 communicating with the inner cavity of the locking sleeve 1120. The locking tail channel 1320 is connected to the locking cavity 1110 through the locking holes 1510. The side wall of the locking tail block 1340 has a locking tail portion 1710 extending from the locking channel into the locking cavity 1110. One end of the locking tail portion 1710 extending into the locking cavity 1110 has a mating portion 1720 with a mating surface. The outer wall of the rotating block 1130 corresponds to each locking tail. Each part 1710 is provided with a mating channel 1610 for mating with a mating surface. When the mating part 1720 is located at one end of the mating channel 1610, the corresponding part of the locking block 1330 extends into the through hole 1030. When the mating part 1720 is located at the other end of the mating channel 1610, the corresponding part of the locking block 1330 does not extend into the through hole 1030. The two ends of the mating channel 1610 are respectively formed with a first slot 1620 and a second slot 1630 for mating with the corresponding side of the mating part 1720.

[0083] A locking cover 1020 is provided on the side of the locking block 1010 away from the bottom wall of the second mounting cavity 810. The inner side of the locking cover 1020 near the rotating block 1130 is provided with a stop part 1210 that extends into the locking cavity 1110 and is used to abut against the end wall of the locking sleeve 1120. A mating port 1040 is provided at the middle of the outer side of the locking cover 1020. A rotating hole 1050 is provided at the middle of the mating port 1040. A locking hole 1640 is formed on the end wall side of the rotating block 1130 corresponding to the rotating hole 1050. The mating port 1040 and the locking hole 1640 are used to cooperate with the driving member 850.

[0084] With the above structure, in order to facilitate the installation of the locking part at the locking channel, a locking sleeve 1120 is provided at the locking cavity 1110. The locking sleeve 1120 is installed in the locking cavity 1110 through the limiting block 1520 and the limiting cavity 1410 to prevent the locking part from being disengaged from the locking channel during installation.

[0085] When the rotating block 1130 rotates forward to a certain angle, the mating part 1720 slides into the first slot 1620 at the mating channel 1610. At this time, the locking block 1330 extends from the locking channel 1310 into the through hole 1030 and presses and locks the corresponding part of the steel strand 120. When the rotating block 1130 rotates in the opposite direction to a certain angle, the mating part 1720 slides into the second slot 1630 at the mating channel 1610. At this time, the locking tail block 1340, under the action of the compression spring 1350, drives the locking block 1330 to retract into the locking channel 1310. Simultaneously, the compression and locking of the corresponding part of the steel strand 120 are released; wherein, the first slot 1620 and the second slot 1630 respectively engage with the corresponding side of the mating part 1720, and the current state of the locking member 830 is maintained when the rotating block 1130 does not rotate, thereby better realizing that the locking member 830 can be unlocked to lock the steel strand 120; and, the abutment part 1210 is provided so that the abutment part 1210 can abut against the end wall of the locking sleeve 1120 to fix the locking sleeve 1120 in the locking cavity 1110.

[0086] In this embodiment, the traction member 840 includes a traction plate 1810 slidably disposed on the bottom wall of the third mounting cavity 820. A mating hole 1830 is provided in the middle of the traction plate 1810 for mating with the driving member 850. Multiple second tightening holes 1910 are formed on the side wall of the traction plate 1810 away from the third mounting cavity 820 and are arranged in a circular pattern. The other ends of the multiple steel strands 120 respectively pass through the second tightening holes 1910. The diameter of the second tightening holes 1910 extends from the bottom of the third mounting cavity 820. The wall gradually increases in size towards the opening of the stepped cavity 720. Each second tightening hole 1910 is provided with a second tightening member 1820 for fixing the steel strand 120. The second tightening member 1820 includes two cooperating second tightening parts 2110, and the corresponding part of the steel strand 120 is fitted between the two second tightening parts 2110. When the two second tightening parts 2110 are fitted together, they are in the shape of a frustum, which is used to fit with the second tightening hole 1910. The two second tightening parts 2110 are connected by an elastic ring 620.

[0087] With the above structure, before tensioning the steel strand 120, the traction plate 1810 passes the corresponding part of the steel strand 120 through the corresponding second tightening hole 1910, so that the two second tightening parts 2110 tighten the corresponding part of the steel strand 120. As a result, when the driving member 850 cooperates with the traction plate 1810, that is, during the process of tensioning the corresponding part of the steel strand 120, the outer wall of the two second tightening parts 2110 can abut against the inner wall of the second tightening hole 1910. Therefore, the traction plate 1810 tightens the corresponding part of the steel strand 120, thereby better achieving the tensioning of the corresponding part of the steel strand 120 by the traction plate 1810 and the driving member 850.

[0088] In this embodiment, a scale line 730 is provided on one side wall of the third mounting cavity 820. The extension direction of the scale line 730 is consistent with the movement direction of the traction plate 1810. The starting scale line 730 is located on the side of the traction plate 1810 away from the bottom wall of the third mounting cavity 820 when the traction plate 1810 is located at the bottom wall of the third mounting cavity 820.

[0089] With the above structure, construction personnel can observe the movement distance of the traction plate 1810 in the third mounting cavity 820, and thus determine the magnitude of the tension; wherein, the relationship between the tensioning distance of the steel strand 120 and the magnitude of the tension is determined according to existing formulas.

[0090] In this embodiment, the driving member 850 includes two rotatable outer rods 2210 and inner rods 2310 that rotate independently. The outer rods 2210 have a shaft cavity formed along the axial direction. The inner rods 2310 are rotatably disposed in the shaft cavity through multiple bearings. The outer rods 2210 have a first driving disk 2220 at one end away from the opening of the stepped cavity 720. Both ends of the inner rods 2310 extend into the two ends of the shaft cavity. The inner rods 2310 have a second driving disk 2240 at one end near the first driving disk 2220. The inner rods 2310 have a locking block 2230 at one end away from the second driving disk 2240. The locking block 2230 is used to cooperate with the locking hole 1640.

[0091] With the above structure, the construction personnel install the drive component 850 at the stepped cavity 720, so that the locking block 2230 at the inner rod 2310 extends into the locking hole 1640 of the rotating block 1130. The construction personnel rotate the second drive disc 2240, thus better realizing the rotation of the rotating block 1130 at the locking cavity 1110, thereby realizing the compression and locking or release of the compression and locking of the steel strand 120 by the locking part.

[0092] In this embodiment, the driving member 850 includes two rotatable outer rods 2210 and inner rods 2310 that rotate independently. The outer rods 2210 have a shaft cavity formed along the axial direction. The inner rods 2310 are rotatably disposed in the shaft cavity through multiple bearings. A first driving disk 2220 is provided at the end of the outer rods 2210 away from the opening of the stepped cavity 720. Both ends of the inner rods 2310 extend into both ends of the shaft cavity. A second driving disk 2240 is provided at the end of the inner rods 2310 near the first driving disk 2220. A lead screw nut is provided at the mating hole 1830. An external helix is ​​formed on the outer wall of the outer rods 2210 for mating with the lead screw nut. The end of the outer rods 2210 away from the first driving disk 2220 is used to abut against the locking member 830.

[0093] With the above structure, the construction personnel first abut the corresponding end of the outer rod 2210 against the mating hole 1830 of the locking member 830, and then drive the first drive disc 2220 so that the traction plate 1810 slides in the third mounting cavity 820 under the rotation of the outer rod 2210, thus better realizing the tensioning of the corresponding part of the steel strand 120 by the traction plate 1810.

[0094] Example 2

[0095] This embodiment provides a precast bridge slab, which is manufactured using a tensioning assembly for precast bridge slabs as described in Embodiment 1. The precast bridge slab body includes a bridge slab main body and a steel reinforcement skeleton embedded in the bridge slab main body. A tensioning assembly is provided at the bridge slab main body, which is used to apply prestress to the precast bridge slab body.

[0096] In this embodiment, a steel reinforcement skeleton is placed in the precast bridge slab mold, and then a tensioning assembly is placed at a predetermined position on the steel reinforcement skeleton. Finally, grout is injected into the precast bridge slab mold to form the main body of the bridge slab. Construction workers apply prestress to the small precast bridge slab by using the tensioning assembly, thereby improving the tensile strength of the small precast bridge slab when bearing loads. Therefore, it better realizes the adaptation scenarios of expanding the manufacturing of small precast bridge slabs.

[0097] Example 3

[0098] like Figure 24 As shown, this embodiment provides a method for manufacturing a precast bridge slab, which is used to implement a precast bridge slab as described in Embodiment 2, comprising,

[0099] Step S1: Prepare the precast bridge slab body;

[0100] In this step, a steel reinforcement skeleton is placed in the precast bridge slab mold, and then the corrugated pipe 110 of the tensioning assembly, the first mounting shell 310 and the second mounting shell 710 are installed at the predetermined positions of the steel reinforcement skeleton. Finally, grout is injected into the precast bridge slab mold to form the main body of the bridge slab.

[0101] Step S2: Install the fixing mechanism 130, the tensioning mechanism 140, and multiple steel strands 120;

[0102] In this step, after the main body of the bridge deck has solidified, the precast bridge deck mold is removed, and the multiple steel strands 120 are inserted into the corrugated pipe 110; the fixing mechanism 130 is installed in the first mounting housing 310, and one end of each steel strand 120 is installed in the corresponding fixing mechanism 130; the tensioning mechanism 140 is installed in the second mounting housing 710, and the other end of each steel strand 120 is sequentially installed in the locking member 830 and the traction member 840;

[0103] Step S3: Apply prestress to the precast bridge slab body;

[0104] In this step, the fixing mechanism 130 tightens one end of the multiple steel strands 120, and the tensioning mechanism 140 tensions the other end of the multiple steel strands 120.

[0105] Step S4: Grout is injected into the corrugated pipe 110 to form a grout body;

[0106] In this step, the grouting port 740 and the grout outlet 350 are used to cooperate with the grouting assembly to form a grout body by grouting in the inner cavity of the bellows 110.

[0107] Step S5: Remove the traction component 840 and the drive component 850;

[0108] In this step, after the grout inside the corrugated pipe 110 has solidified, the excess steel strands 120 at both ends of the bridge deck body are cut off using pliers; and the drive component 850 and the traction component 840 are removed in sequence; and,

[0109] Step S6: Seal the first mounting housing 310 and the second mounting housing 710;

[0110] In this step, grouting is performed at the first mounting housing 310 and the second mounting housing 710 to form a grouting body.

[0111] Through the above steps S1-S6, a precast bridge slab body with stronger tensile strength and wider adaptability under load is thus better manufactured.

[0112] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0113] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A tensioning component, characterized in that: The tensioning assembly includes a main body (100), which includes a corrugated pipe (110) for installation in the precast bridge slab, a steel strand (120) installed in the corrugated pipe (110), a fixing mechanism (130) installed at one end of the corrugated pipe (110) and for cooperating with one end of the steel strand (120), and a tensioning mechanism (140) installed at the other end of the corrugated pipe (110) and for cooperating with the other end of the steel strand (120). The tensioning mechanism (140) has a locking member (830), a traction member (840), and a driving member (850). The locking member (830) is used to lock the steel strand (120) in an unlockable manner, and the traction member (840) is used to tighten the steel strand (120). The driving member (850) is used to cooperate with the locking member (830) and the traction member (840) at the same time to realize the outward tensioning of the steel strand (120). A second mounting housing (710) is provided at the other end of the bellows (110), and a stepped cavity (720) communicating with the inner cavity of the bellows (110) is formed in the second mounting housing (710). The opening of the stepped cavity (720) is located away from the other end of the bellows (110). The stepped cavity (720) includes a second mounting cavity (810) and a third mounting cavity (820) formed sequentially on the opening side of the stepped cavity (720). 10) has a cross-sectional area smaller than that of the third mounting cavity (820); the locking member (830) is located in the second mounting cavity (810), the traction member (840) is slidably located in the third mounting cavity (820), and the driving member (850) is located at the opening of the stepped cavity (720); multiple steel strands (120) are arranged in the corrugated pipe (110) and are circumferentially distributed, and the corresponding parts of the multiple steel strands (120) extend into the stepped cavity (720); The locking component (830) includes a locking block (1010) installed on the bottom wall of the second mounting cavity (810). The locking block (1010) has a plurality of circumferentially distributed through holes (1030), and the corresponding portions of the plurality of steel strands (120) pass through the through holes (1030). A locking cavity (1110) is formed in the middle of the locking block (1010), and the opening of the locking cavity (1110) is located on the side of the locking block (1010) away from the bottom wall of the second mounting cavity (810). The axial direction of the locking cavity (1110) is parallel to the axial direction of the multiple through holes (1030). Multiple locking channels are provided between the locking cavity (1110) and each through hole (1030) and are arranged linearly along the axis of the locking cavity (1110). The locking channels include a locking head channel (1310) for connecting the through hole (1030) and a locking tail channel (1320) for connecting the locking cavity (1110). A locking part is provided at the locking channel. The locking part includes a locking head block (1330) that moves in the locking head channel (1310) and a locking tail block (1340) that moves in the locking tail channel (1320). A compression spring (1350) is provided in the locking tail channel (1320). The compression spring (1350) is used to maintain the tendency of the locking tail block (1340) to move toward the locking cavity (1110). A rotating block (1130) is rotatably provided inside the locking cavity (1110). The rotating block (1130) is used to cooperate with the locking part so that the locking head block (1330) extends into the through hole (1030) and is used to lock and unlock the corresponding part of the steel strand (120).

2. A tensioning component according to claim 1, characterized in that: A first mounting housing (310) is provided at one end of the corrugated pipe (110), and a first mounting cavity (320) is formed in the first mounting housing (310) communicating with the inner cavity of the corrugated pipe (110). The opening of the first mounting cavity (320) is located on the side away from the corrugated pipe (110). The fixing mechanism (130) includes a fixing plate (330) located on the bottom wall of the first mounting cavity (320). A plurality of first tightening holes (410) are formed on the side of the fixing plate (330) away from the corrugated pipe (110) and arranged in a circular pattern. A plurality of steel strands (120) are provided in the corrugated pipe (110) and arranged in a circular pattern. The corresponding parts of the plurality of steel strands (120) respectively pass through the first tightening holes (410). A first tightening member (340) for fixing the steel strands (120) is provided at each first tightening hole (410).

3. A tensioning component according to claim 2, characterized in that: The diameter of the first tightening hole (410) gradually increases from the bottom wall of the first mounting cavity (320) toward the opening of the first mounting cavity (320). The first tightening member (340) includes two mutually cooperating first tightening parts (610). The corresponding part of the steel strand (120) is fitted between the two first tightening parts (610). When the two first tightening parts (610) are mutually cooperating, they are in the shape of a frustum. The frustum shape is used to cooperate with the first tightening hole (410). The two first tightening parts (610) are connected and cooperated by an elastic ring (620).

4. A tensioning component according to claim 1, characterized in that: A locking sleeve (1120) is provided on the inner wall of the locking cavity (1110), and a rotating block (1130) is rotatably disposed in the locking sleeve (1120); a limiting cavity (1410) is provided on the bottom wall of the locking cavity (1110), and a limiting block (1520) extending into the limiting cavity (1410) is provided on the corresponding side of the outer wall of the locking sleeve (1120). The outer wall of the locking sleeve (1120) is provided with multiple locking holes (1510) communicating with the inner cavity of the locking sleeve (1120). The locking tail channel (1320) is connected to the locking cavity (1110) through the locking holes (1510). The side wall of the locking tail block (1340) is formed with a locking tail portion (1710) extending from the locking channel into the locking cavity (1110). One end of the locking tail portion (1710) extending into the locking cavity (1110) is formed with a mating portion (1720), and the mating portion (1720) has a mating surface. The outer wall of the rotating block (1130) corresponds to each locking tail. Each part (1710) is provided with a mating channel (1610) for mating with the mating surface. When the mating part (1720) is located at one end of the mating channel (1610), the corresponding part of the locking block (1330) extends into the through hole (1030). When the mating part (1720) is located at the other end of the mating channel (1610), the corresponding part of the locking block (1330) does not extend into the through hole (1030). The two ends of the mating channel (1610) are respectively provided with a first slot (1620) and a second slot (1630) for mating with the corresponding side of the mating part (1720). A locking cover (1020) is provided on the side of the locking block (1010) away from the bottom wall of the second mounting cavity (810). The inner side of the locking cover (1020) near the rotating block (1130) is provided with an abutment part (1210) that extends into the locking cavity (1110) and is used to abut against the end wall of the locking sleeve (1120). A mating port (1040) is provided at the middle of the outer side of the locking cover (1020). A rotating hole (1050) is provided at the middle of the mating port (1040). A locking hole (1640) is formed on the end wall side of the rotating block (1130) corresponding to the rotating hole (1050). The mating port (1040) and the locking hole (1640) are used to cooperate with the driving member (850).

5. A tensioning component according to claim 1, characterized in that: The traction component (840) includes a traction plate (1810) slidably disposed on the bottom wall of the third mounting cavity (820). A mating hole (1830) is provided in the middle of the traction plate (1810) for mating with the drive component (850). Multiple second tightening holes (1910) are formed on the side wall of the traction plate (1810) away from the third mounting cavity (820) and are arranged in a circular pattern. The other ends of the multiple steel strands (120) respectively pass through the second tightening holes (1910). The diameter of the second tightening holes (1910) extends from the bottom wall of the third mounting cavity (820). The opening gradually increases towards the stepped cavity (720), and each second tightening hole (1910) is provided with a second tightening member (1820) for fixing the steel strand (120); the second tightening member (1820) includes two mutually cooperating second tightening parts (2110), and the corresponding part of the steel strand (120) is fitted between the two second tightening parts (2110); the two second tightening parts (2110) are frustum-shaped when they cooperate with each other, and the frustum shape is used to cooperate with the second tightening hole (1910); the two second tightening parts (2110) are connected and cooperated by an elastic ring (620).

6. A tensioning component according to claim 5, characterized in that: A scale line (730) is provided on one side wall of the third mounting cavity (820). The extension direction of the scale line (730) is consistent with the movement direction of the traction plate (1810). The starting scale line (730) is located on the side of the traction plate (1810) away from the bottom wall of the third mounting cavity (820) when the traction plate (1810) is located at the bottom wall of the third mounting cavity (820).

7. A tensioning component according to claim 4, characterized in that: The drive component (850) includes two rotatable outer rods (2210) and inner rods (2310) that rotate independently of each other. The outer rods (2210) have a shaft cavity formed along the axial direction. The inner rods (2310) are rotatably disposed in the shaft cavity through multiple bearings. The end of the outer rods (2210) away from the opening of the stepped cavity (720) is provided with a first drive disk (2220). Both ends of the inner rods (2310) extend into the ends of the shaft cavity. The end of the inner rods (2310) near the first drive disk (2220) is provided with a second drive disk (2240). The end of the inner rods (2310) away from the second drive disk (2240) is provided with a locking block (2230), which is used to cooperate with the locking hole (1640).

8. A tensioning component according to claim 5, characterized in that: The driving component (850) includes two rotatable outer rods (2210) and inner rods (2310) that rotate independently. The outer rods (2210) have a shaft cavity formed along the axial direction. The inner rods (2310) are rotatably disposed in the shaft cavity through multiple bearings. The end of the outer rods (2210) away from the opening of the stepped cavity (720) is provided with a first driving disk (2220). Both ends of the inner rods (2310) extend into the ends of the shaft cavity. The end of the inner rods (2310) near the first driving disk (2220) is provided with a second driving disk (2240). A lead screw nut is provided at the mating hole (1830). An external helix is ​​formed on the outer wall of the outer rods (2210) for mating with the lead screw nut. The end of the outer rods (2210) away from the first driving disk (2220) is used to abut against the locking component (830).

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