A precast box girder reinforcement spacing adjustment device

Abstract

This utility model discloses a precast box girder rebar spacing adjustment device, specifically relating to the field of building engineering technology. This utility model incorporates components such as an electrically controlled lifting machine, lifting blocks, a bidirectional lead screw, and a slide rail. Through the transmission relationship between the electric lifting machine's built-in motor and the bidirectional lead screw, the lifting blocks are threaded onto the lead screw and move synchronously in opposite directions linearly as the lead screw rotates. This achieves the effect of precisely adjusting the spacing of the clamping components mounted on the lifting blocks by electrically driving the bidirectional lead screw, realizing automated control of the rebar spacing, avoiding manual adjustment errors, and ensuring the consistency and accuracy of the rebar spacing. Through the detachable magnetic connection between the magnetic block and the slide rail, and the pre-compression relationship between the spring and the upper clamping block, the upper clamping block, through the constant clamping force of the spring, forms a closed rhomboid space with the V-shaped groove of the lower clamping block to firmly clamp the rebar.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and more specifically, to a device for adjusting the spacing of reinforcing bars in precast box girders. Background Technology

[0002] Precast box girders are widely used in bridge construction, and the accuracy of their rebar spacing directly affects the structural strength and service life of the box girder. In traditional construction, rebar spacing adjustment relies heavily on manual measurement and operation, which is not only inefficient but also prone to significant errors due to human factors, making it difficult to meet the high-precision quality requirements of modern engineering. Some existing control devices are complex in structure and lack flexibility, failing to adapt to the rebar spacing adjustment of different box girder specifications and unable to effectively address potential rebar displacement and swaying issues during construction.

[0003] A search revealed Chinese Patent Publication No. CN221187008U, which discloses a precast box girder reinforcement spacing adjustment device. The device includes a support rod and a main rod. Several nuts are provided on one side of the support rod, and one end of a pull rod is internally threaded onto each nut. A sleeve is fixedly connected to the surface of the main rod, and the other end of the pull rod is movably connected inside the sleeve. Several slots are formed on one side of the pull rod within the sleeve. A fixed cylinder is fixedly connected to the surface of the sleeve, and an insert rod is provided inside the fixed cylinder via a moving component. The insert rod penetrates the sleeve and inserts into the slot. This invention has the following advantages: by using the moving component, the component resists compression and drives the insert rod to move into the sleeve and insert into the slot on the surface of the pull rod, thereby fixing the position of the adjusted pull rod and preventing it from sliding due to external forces, which would affect the spacing adjustment.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: the devices fix the tie rods using components such as sleeves and inserts, resulting in a relatively fixed structure that makes it difficult to quickly adapt to the needs of rebar operations with different specifications and layouts. When faced with complex scenarios involving the binding of rebars for precast box girders, where frequent adjustments to the spacing and position of the rebars are required, convenient rearrangement and adjustment are not possible.

[0005] Therefore, a precast box girder reinforcement spacing control device is proposed to address the above problems. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a precast box girder reinforcement spacing adjustment device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a precast box girder reinforcement spacing adjustment device, comprising a support mechanism, a box girder casting outer frame being provided on the top of the support mechanism, and a spacing adjustment mechanism being provided on one side of the support mechanism; the support mechanism includes a base for supporting the box girder casting outer frame and a horizontal push plate for adjusting the direction of the box girder casting outer frame; the spacing adjustment mechanism includes a clamping assembly and an adjusting assembly, the clamping assembly including a slide rail fixedly installed on one side of a lifting block, a magnetic block magnetically connected to the top of the slide rail, and a lower clamping block with a V-shaped groove, the top of the lower clamping block being movably connected to an upper clamping block with an inverted V-shaped groove, the lower clamping block and the upper clamping block jointly clamping the reinforcement.

[0008] Preferably, the adjustment assembly includes an electrically controlled lifting mechanism symmetrically arranged on the left and right sides of the slide rail, and a lifting block driven by a motor and a bidirectional lead screw built into the electrically controlled lifting mechanism. The lifting block is threaded onto the upper and lower ends of the bidirectional lead screw. When the lead screw rotates, the two lifting blocks move synchronously towards or in opposite directions.

[0009] Preferably, the top of the base is provided with a sliding groove, and the horizontal push plate is movably installed on the top of the sliding groove of the base.

[0010] Preferably, the clamping assembly further includes a limiting shell fixedly installed on one side of the lower clamping block. The limiting shell is fixedly connected to the magnetic block. A top plate is fixedly installed on the top of the limiting shell. A pull rod is movably sleeved through the center hole of the top plate. The pull rod is fixedly connected to the upper clamping block. A spring is provided at the bottom of the top plate. The top of the spring is fixedly connected to the top plate, and the bottom is fixedly connected to the upper clamping block. The top plate is fixed to the top of the limiting shell. The center hole allows the pull rod to pass through, limiting the movement trajectory of the upper clamping block. The pull rod connects the upper clamping block and the top plate, transmitting spring force and preventing the upper clamping block from falling off.

[0011] Preferably, the magnetic connection between the magnetic block and the slide rail is a detachable connection, and the adsorption surface of the magnetic block is parallel and attached to the top surface of the slide rail.

[0012] Preferably, the spring is in a pre-compressed state, providing a constant clamping force to the upper clamping block toward the lower clamping block.

[0013] Preferably, the V-shaped groove of the lower clamping block and the inverted V-shaped groove of the upper clamping block form a closed rhomboid clamping space when in the closed state.

[0014] Preferably, the rotational motion of the bidirectional lead screw is driven by the motor of the electrically controlled lifting machine, causing the two lifting blocks to move synchronously towards or in opposite directions linearly along the slide rail.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. Compared with existing technologies, this precast box girder rebar spacing adjustment device, through the inclusion of components such as an electrically controlled lifting machine, lifting blocks, bidirectional lead screws, and slide rails, utilizes the transmission relationship between the built-in motor of the electrically controlled lifting machine and the bidirectional lead screws. This allows the lifting blocks to be threaded onto the bidirectional lead screws and move synchronously in opposite directions or linearly as the lead screws rotate. This achieves the effect of precisely adjusting the spacing of the clamping components mounted on the lifting blocks by electrically driving the bidirectional lead screws, realizing automated control of the rebar spacing, avoiding manual adjustment errors, and ensuring the consistency and accuracy requirements of the rebar spacing.

[0017] 2. Compared with existing technologies, this precast box girder rebar spacing adjustment device, through the inclusion of components such as magnetic blocks, slide rails, lower clamping blocks, upper clamping blocks, springs, and limiting shells, utilizes the detachable magnetic connection between the magnetic blocks and slide rails, and the pre-compression engagement between the springs and the upper clamping blocks. This allows the upper clamping blocks to form a closed rhomboid space with the V-shaped groove of the lower clamping blocks through the constant clamping force of the springs, thus firmly clamping the rebars. This achieves the effect of quickly positioning the clamping components through magnetic connection and adaptively clamping rebars of different diameters through an elastic clamping structure, improving the flexibility and applicability of the device and ensuring that the rebars do not shift during the pouring process. Attached Figure Description

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

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a partial structural diagram of the adjusting mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of a partial structure of the adjusting mechanism of this utility model.

[0022] The attached figures are labeled as follows: 1. Support mechanism; 101. Base; 102. Horizontal push plate; 2. Box girder casting outer frame; 3. Adjustment mechanism; 301. Electric control hoist; 302. Lifting block; 303. Slide rail; 304. Magnetic block; 305. Limiting shell; 306. Top plate; 307. Spring; 308. Lower clamping block; 309. Upper clamping block; 310. Tie rod. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1 and Figure 2 As shown, a precast box girder reinforcement spacing adjustment device includes a support mechanism 1. The support mechanism 1 includes a base 101 for supporting the outer frame 2 of the box girder casting and a horizontal push plate 102 for adjusting the direction of the outer frame 2. A groove is provided on the top of the base 101, and the horizontal push plate 102 is movably installed on the top of the groove of the base 101. The base 101 stably supports the outer frame 2 of the box girder casting, and the horizontal push plate 102 can move flexibly along the groove to achieve precise adjustment of the direction of the outer frame 2, ensuring that the position of each component meets the construction requirements during box girder casting and improving the stability and adaptability of the overall structure.

[0025] like Figures 1 to 4 As shown, the top of the support mechanism 1 is equipped with a box girder casting outer frame 2, and one side of the support mechanism 1 is equipped with a spacing adjustment mechanism 3. The spacing adjustment mechanism 3 includes a clamping component and an adjusting component. The clamping component includes a slide rail 303 fixedly installed on one side of the lifting block 302, a magnetic block 304 magnetically connected to the top of the slide rail 303, and a lower clamping block 308 with a V-shaped groove. The top of the lower clamping block 308 is movably connected to an upper clamping block 309 with an inverted V-shaped groove. The lower clamping block 308 and the upper clamping block 309 together clamp the reinforcing bars. The clamping component is conveniently installed through the magnetic connection between the magnetic block 304 and the slide rail 303. The V-shaped and inverted V-shaped grooves cooperate to form a stable clamping space, which can firmly fix the reinforcing bars and ensure that the position of the reinforcing bars does not shift during the spacing adjustment process, providing reliable support for precise control of the spacing.

[0026] like Figure 2 As shown, the adjustment assembly includes electrically controlled lifting platforms 301 symmetrically arranged on the left and right sides of the slide rail 303, and lifting blocks 302 driven by a built-in motor and a bidirectional lead screw in the electrically controlled lifting platforms 301. The lifting blocks 302 are threaded onto the upper and lower ends of the bidirectional lead screw. The rotational movement of the bidirectional lead screw is driven by the motor of the electrically controlled lifting platform 301, causing the two lifting blocks 302 to move synchronously in opposite directions or linearly along the slide rail 303. The adjustment assembly utilizes the motor of the electrically controlled lifting platform 301 to drive the bidirectional lead screw, causing the lifting blocks 302 to move synchronously, thus achieving automated adjustment of the clamping assembly spacing. This allows for flexible control of the rebar spacing according to construction needs, improving work efficiency and control accuracy, and reducing human error.

[0027] like Figure 3 and Figure 4 As shown, the clamping assembly also includes a limiting housing 305 fixedly installed on one side of the lower clamping block 308. The limiting housing 305 is fixedly connected to the magnetic block 304. A top plate 306 is fixedly installed on the top of the limiting housing 305. A pull rod 310 is movably sleeved through the center hole of the top plate 306. The pull rod 310 is fixedly connected to the upper clamping block 309. A spring 307 is provided at the bottom of the top plate 306. The top of the spring 307 is fixedly connected to the top plate 306, and the bottom is fixedly connected to the upper clamping block 309. The limiting housing 305 cooperates with the top plate 306, and the upper clamping block 309 can move up and down through the spring 307 and the pull rod 310. The pre-compressed spring 307 provides a continuous clamping force, ensuring that steel bars of different diameters can be stably clamped, while accommodating slight positional deviations during steel bar installation, thus enhancing the versatility and reliability of the clamping structure.

[0028] like Figure 2 and Figure 4 As shown, the magnetic connection between the magnetic block 304 and the slide rail 303 is detachable. The adsorption surface of the magnetic block 304 is parallel and in contact with the top surface of the slide rail 303. The spring 307 is in a pre-compressed state, providing a constant clamping force towards the lower clamping block 308 for the upper clamping block 309. The V-shaped groove of the lower clamping block 308 and the inverted V-shaped groove of the upper clamping block 309 form a closed rhomboid clamping space when closed. The detachable magnetic connection between the magnetic block 304 and the slide rail 303 facilitates the installation and disassembly of the clamping components. The pre-compressed spring 307 ensures stable clamping force. The rhomboid clamping space can evenly wrap the reinforcing bars, effectively preventing displacement of the reinforcing bars due to vibration and other factors during the pouring process, ensuring that the spacing of the reinforcing bars meets the design standards, and improving the construction quality of the precast box girder.

[0029] Example

[0030] Precise adjustment of the spacing of transverse reinforcing bars in the bottom slab of precast box girder

[0031] During the reinforcement binding process of the precast box girder bottom slab, the spacing of the transverse reinforcement needs to be adjusted. The operator first fixes the base 101 of the support mechanism 1 to the precast platform. By pushing the horizontal push plate 102 to slide within the groove at the top of the base 101, the outer frame 2 of the box girder is adjusted to a suitable working position. Then, the electrically controlled lifting mechanism 301 of the spacing adjustment mechanism 3 is activated. Its built-in motor drives the bidirectional lead screw to rotate, causing the lifting blocks 302, threaded onto the upper and lower ends of the bidirectional lead screw, to move synchronously in opposite directions along the slide rail 303, transporting the clamping assembly to the bottom slab reinforcement laying area.

[0032] When a single transverse rebar needs to be secured, the operator pulls the lever 310, causing the upper clamping block 309 to move upwards, compressing the spring 307. This separates the upper clamping block 309, which has an inverted V-shaped groove, from the lower clamping block 308, which has a V-shaped groove, placing the rebar in the clamping area between them. After releasing the lever 310, the pre-compressed spring 307 returns to its original position, pushing the upper clamping block 309 downwards. This, in conjunction with the V-shaped groove of the lower clamping block 308, forms a closed diamond-shaped clamping space, tightly securing the rebar. If the spacing between adjacent rebars needs to be adjusted, the electric lifting machine 301 is restarted. The two lifting blocks 302 are driven by a bidirectional screw to move linearly in opposite directions along the slide rail 303, causing the rebars they hold to move synchronously until the designed spacing is achieved. Because the magnetic block 304 and the slide rail 303 are detachably magnetically connected, and their adsorption surfaces are parallel and in contact, the magnetic block 304 can be removed at any time during the adjustment process to fine-tune the position of the slide rail 303, ensuring accurate rebar positioning.

[0033] The implementation principle of the precast box girder reinforcement spacing adjustment device of this utility model is as follows:

[0034] First, the base 101 is fixed to the construction platform. The horizontal position of the outer frame 2 of the box girder is adjusted by sliding the horizontal push plate 102 in the groove of the base 101, so that its axis is aligned with the design position of the precast box girder. This step provides a reference frame for subsequent reinforcement laying through the mechanical positioning of the support mechanism 1, ensuring that the entire spacing adjustment operation is carried out in a unified coordinate system and avoiding reinforcement spacing errors caused by frame offset.

[0035] Next, the electric lifting machine 301 is started, and the built-in motor drives the bidirectional lead screw to rotate, so that the lifting block 302 moves along the slide rail 303 to the initial spacing position. At the same time, according to the rebar laying design plan, the magnetic block 304 is fixed to the designated position of the slide rail 303 by magnetic adsorption, so that the lower clamping block 308 and the upper clamping block 309 of the clamping assembly are aligned with the preset installation point of the rebar. This process completes the initial parameter setting of the spacing adjustment mechanism 3, providing a positioning reference for the rebar clamping.

[0036] Next, the steel bar to be laid is placed in the V-shaped groove of the lower clamping block 308. Under the elastic force of the pre-compression spring 307, the upper clamping block 309 moves downward, and its inverted V-shaped groove closes with the lower clamping block 308 to form a diamond-shaped clamping space, which closely fits the circular cross section of the steel bar. The pull rod 310 and the limiting shell 305 restrict the movement trajectory of the upper clamping block 309 to ensure that the clamping force is evenly distributed. At this time, the magnetic connection between the magnetic block 304 and the slide rail 303 fixes the position of the clamping assembly, thus completing the stable clamping of a single steel bar.

[0037] Next, according to the design spacing parameters, the electric lifting platform 301 drives the bidirectional lead screw to rotate forward or reverse: when the lead screw rotates forward, the lifting blocks 302 at both ends move synchronously towards each other along the slide rail 303 to reduce the spacing between the reinforcing bars; when it rotates in reverse, it moves in the opposite direction to expand the spacing. Since the lifting blocks 302 are precisely engaged with the bidirectional lead screw through threads, their linear movement distance is precisely controlled by the lead screw pitch and the number of rotations, realizing the synchronous displacement of multiple sets of clamping components, and finally adjusting the spacing between the reinforcing bars to the design value, with the error controlled within the millimeter level.

[0038] Finally, after adjusting the spacing of the reinforcing bars, the concrete pouring operation of the box girder is carried out. The constant spring force and magnetic fixing structure of the clamping components ensure that the reinforcing bars do not shift during the pouring vibration. After the concrete has initially set, the power supply of the electric control hoist 301 is cut off, the magnetic connection between the magnetic block 304 and the slide rail 303 is released, the clamping force of the spring 307 is released and the reinforcing bars are removed. The outer frame of the pouring is reset by the horizontal push plate 102 to prepare for the next prefabrication operation. The whole process realizes a closed loop of mechanized operation from positioning, clamping, spacing adjustment to construction.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precast box girder reinforcement spacing adjustment device, comprising a support mechanism (1), characterized in that: The top of the support mechanism (1) is provided with a box girder casting outer frame (2), and the side of the support mechanism (1) is provided with an adjustment mechanism (3); the support mechanism (1) includes a base (101) for supporting the box girder casting outer frame (2) and a horizontal push plate (102) for adjusting the direction of the box girder casting outer frame (2); the adjustment mechanism (3) includes a clamping component and an adjusting component. The clamping component includes a slide rail (303) fixedly installed on one side of the lifting block (302), a magnetic block (304) magnetically connected to the top of the slide rail (303), and a lower clamping block (308) with a V-shaped groove. The top of the lower clamping block (308) is movably connected to an upper clamping block (309) with an inverted V-shaped groove. The lower clamping block (308) and the upper clamping block (309) together clamp the reinforcing bars.

2. The precast box girder reinforcement spacing adjustment device according to claim 1, characterized in that: The adjustment assembly includes an electrically controlled lifting mechanism (301) symmetrically arranged on the left and right sides of the slide rail (303), and a lifting block (302) driven by a motor and a bidirectional lead screw built into the electrically controlled lifting mechanism (301). The lifting block (302) is threaded onto the upper and lower ends of the bidirectional lead screw.

3. The precast box girder reinforcement spacing adjustment device according to claim 1, characterized in that: The base (101) has a groove on its top, and the horizontal push plate (102) is movably installed on the top of the groove of the base (101).

4. The precast box girder reinforcement spacing adjustment device according to claim 1, characterized in that: The clamping assembly also includes a limiting shell (305) fixedly installed on one side of the lower clamping block (308), the limiting shell (305) being fixedly connected to the magnetic block (304); a top plate (306) is fixedly installed on the top of the limiting shell (305), a pull rod (310) is movably sleeved in the center hole of the top plate (306), the pull rod (310) being fixedly connected to the upper clamping block (309); a spring (307) is provided at the bottom of the top plate (306), the top of the spring (307) being fixedly connected to the top plate (306), and the bottom of the spring (307) being fixedly connected to the upper clamping block (309).

5. The precast box girder reinforcement spacing adjustment device according to claim 1, characterized in that: The magnetic connection between the magnetic block (304) and the slide rail (303) is a detachable connection, and the adsorption surface of the magnetic block (304) is parallel and attached to the top surface of the slide rail (303).

6. The precast box girder reinforcement spacing adjustment device according to claim 4, characterized in that: The spring (307) is in a pre-compressed state, providing a constant clamping force to the upper clamping block (309) toward the lower clamping block (308).

7. The precast box girder reinforcement spacing adjustment device according to claim 1, characterized in that: The V-shaped groove of the lower clamping block (308) and the inverted V-shaped groove of the upper clamping block (309) form a closed rhomboid clamping space when in the closed state.

8. The precast box girder reinforcement spacing adjustment device according to claim 2, characterized in that: The rotation of the bidirectional lead screw is driven by the motor of the electric lifting machine (301), causing the two lifting blocks (302) to move synchronously towards or in opposite directions linearly along the slide rail (303).

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