A notching tool applied to light I-beams

Abstract

The utility model discloses a kind of notched tooling applied to light I-beam, belong to notched opening technical field, solve the problem that traditional light I-beam notched opening adopts foam mould and cannot be reused, poor reliability, inconvenient to use, the utility model includes notched steel strip, notched steel strip is inverted convex, notched steel strip straight section both ends are respectively provided with slide rail, sliding block is slidably arranged on slide rail, and the sliding block bottom is connected with switch magnet by bolt.The utility model is accurately designed to notched steel strip, slide rail, sliding block, switch magnet, push-pull clamp and the section structure of notched steel strip, and each component cooperates, to realize the technical breakthrough of light I-beam notched opening.

Description

Technical Field

[0001] This utility model belongs to the field of slot opening technology, specifically relating to a slot opening tooling applied to light I-beams. Background Technology

[0002] Lightweight I-beams are widely used in highway bridges of various grades. The slots on their surface are the key structure for connecting with the shear key slots of the bridge deck. The dimensional accuracy, positional accuracy, and forming quality of the slots directly determine the assembly efficiency and overall load-bearing capacity of the lightweight I-beams.

[0003] Traditionally, the slotting of lightweight I-beams is formed using foam molds. This technology has the following inherent drawbacks: Low forming accuracy: The foam mold has poor rigidity and is easily deformed by the lateral pressure of concrete and the impact of vibration during concrete pouring and vibration. This leads to uneven width, depth deviation, and unevenness of the inner wall of the formed slot, failing to meet the assembly requirements for precise embedding of the I-beam. It can also result in excessive gaps between the I-beam and the slot, affecting connection stability. Poor versatility: The foam mold is a customized, one-time component with fixed dimensions. It cannot be adjusted and adapted to the side molds of lightweight I-beams with different widths and heights. Individual molds are required for different projects. Customized molds not only increase material costs but also extend the construction preparation period and reduce construction efficiency; insufficient fixation reliability: foam molds lack effective fixing structures, and during pouring, they are prone to lateral displacement or longitudinal floating due to concrete buoyancy and vibration forces, causing the groove position to deviate from the design benchmark. Subsequent secondary cutting and trimming of the groove is required, increasing process costs; resource waste and environmental issues: foam molds need to be crushed and removed after use and cannot be reused. This not only causes a large waste of foam materials, but the foam debris generated during the crushing process can also easily pollute the construction environment, and the residual foam particles may affect the bonding strength between concrete and I-beams, posing structural safety hazards.

[0004] Therefore, there is an urgent need for a reusable, versatile, reliable, and high-precision slotting tool to solve the above-mentioned technical defects of traditional foam molds in slotting light I-beams, and to improve construction quality and economy. Utility Model Content

[0005] The purpose of this invention is to provide a slotting tooling for light I-beams, in order to solve the problems of traditional light I-beam slotting using foam molds, which are not reusable, have poor reliability, and are inconvenient to use.

[0006] The technical solution of this utility model is: a slotting fixture for light I-beams, including a slotted steel bar, the slotted steel bar is inverted convex, and slide rails are respectively provided at both ends of the straight section of the slotted steel bar. A slider is slidably provided on the slide rail, and a switch magnet is connected to the bottom of the slider by bolts.

[0007] As a further improvement of this utility model, push-pull clamps are respectively provided on both sides of the straight section on both sides of the protruding section at the lower end of the grooved steel bar.

[0008] As a further improvement of this utility model, the upper half of the cross-section of the protruding section at the lower end of the grooved steel bar is rectangular and the lower half is an isosceles trapezoid.

[0009] The beneficial effects of this utility model are as follows: Through the precise design of the slotted steel bar, slide rail, slider, switch magnet, push-pull clamp and the cross-sectional structure of the slotted steel bar, the utility model achieves a technical breakthrough in the slotting of light I-beams by the coordinated action of each component.

[0010] 1. The grooved steel bar adopts an inverted convex integrated structure. Its lower convex section can directly "reserve" groove space during the concrete pouring process, eliminating the need for subsequent mechanical cutting and processing. This completely simplifies the groove opening process, transforming the traditional "post-pouring processing" into "simultaneous forming during pouring," thus improving construction efficiency. At the same time, the upper straight section of the inverted convex structure can serve as an operating and fixing carrier, providing stable support for the installation of slide rails and clamps, preventing the steel bar from deforming due to local stress, and ensuring the overall structural rigidity of the tooling.

[0011] 2. The slide rails at both ends of the straight section of the slotted steel bar and the sliding block form an "adjustable and adaptable structure": When the slider slides laterally along the slide rail, the position of the slotted steel bar between side molds of different widths can be flexibly adjusted, covering a wider range of side mold spacings. There is no need to customize special tooling for different projects, which significantly improves versatility and reduces tooling procurement costs. In addition, the slide rail adopts a rectangular cross-section design, which not only ensures smooth sliding but also prevents the slider from swaying laterally, ensuring the accuracy of the slot's lateral position.

[0012] 3. The switch magnet at the bottom of the slider enables quick fixing and disassembly of the tooling.

[0013] Fixing stage: The switch magnet can be directly attached to the outer metal wall of the side mold, and the slider and the groove steel bar are firmly fixed by magnetic force, which effectively resists the buoyancy and vibration impact during concrete pouring, prevents the groove steel bar from floating or shifting, and ensures the longitudinal depth accuracy of the groove. Disassembly phase: Simply flick the magnetic control lever of the switch magnet to release the adsorption, eliminating the need for complex disassembly operations such as bolts and clips, thus shortening the fixing and disassembly time and greatly improving construction efficiency; High compatibility: The switch magnet is compatible with various types of steel molds, eliminating the need for additional drilling or modification of the molds, thus reducing construction and modification costs.

[0014] 4. The push-pull clamps, which are installed through the straight sections on both sides of the protruding section at the lower end of the groove steel bar, provide a solution for demolding that is both labor-saving and protects the molded groove.

[0015] Effortless demolding: The clamps are designed based on the lever principle, and a small force is enough to move the grooved steel bar upward, avoiding damage to the groove edge caused by the violent prying during traditional demolding; Smooth demolding: The clamps and the grooved steel bar are connected by a bushing, which ensures that the steel bar moves vertically upward when pulled, preventing the steel bar from tilting and scraping the inner wall of the groove, and ensuring the flatness of the inner wall of the groove. Assisted positioning: Before demolding, the height of the steel bar in the groove can be finely adjusted with clamps to ensure that the separation gap between the steel bar and the concrete is uniform, further improving the smoothness of demolding.

[0016] 5. The cross-sections on both sides of the protruding section at the lower end of the grooved steel bar adopt a composite design of "upper half rectangle + lower half isosceles trapezoid".

[0017] Upper rectangular section: enhances the deformation resistance of the raised section, can withstand greater lateral pressure during concrete pouring, and avoids deviation in groove size caused by bending of the raised section; The lower isosceles trapezoidal section reduces the contact area between the steel bar and the concrete, lowers the demolding friction, and at the same time, the trapezoidal slope can guide the concrete to fully fill the cavity of the side mold during pouring, avoiding defects such as air bubbles and honeycomb at the bottom of the groove. Excellent molding quality: The trapezoidal structure creates a gentle slope on the inner wall of the slot, which can be used for "guiding and positioning" when the I-beam is embedded, reducing assembly difficulty. In addition, the slope can disperse the contact stress between the I-beam and the slot, improving the connection load-bearing performance.

[0018] This utility model tooling has a simple structure and reliable component connections, achieving comprehensive advantages such as reusability, multi-specification adaptability, high-precision molding, and rapid operation. Compared with traditional foam molds, it improves the accuracy of groove dimensions, increases construction efficiency, reduces material costs, and generates no waste, meeting the requirements of green construction. At the same time, all components of the tooling can be made of carbon steel, which is wear-resistant and corrosion-resistant, and is suitable for various indoor and outdoor light I-beam construction scenarios, possessing significant technical and economic value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the utility model in use.

[0020] In the diagram: 1-Slotted steel bar; 2-Slide rail; 3-Slider; 4-Switch magnet; 5-Push-pull clamp; 6-Side mold; 7-Slot; 8-I-beam; 9-Concrete. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-3 As shown, a slotting fixture for a lightweight I-beam includes a slotted steel bar 1, which is inverted convex in shape. Slide rails 2 are respectively provided at both ends of the straight section of the slotted steel bar 1. A slider 3 is slidably mounted on the slide rails 2. A switch magnet 4 is bolted to the bottom of the slider 3.

[0023] Push-pull clamps 5 are respectively installed on both sides of the straight section on both sides of the lower protruding section of the slotted steel bar 1. The cross-section of both sides of the lower protruding section of the slotted steel bar 1 is rectangular in the upper half and isosceles trapezoidal in the lower half.

[0024] Example 1 In this embodiment, the specific use of the tooling must follow the process of "pretreatment → casting and molding → installation and positioning → I-beam layout → demolding and reuse", and the specific steps are as follows: Step 1 Tooling component appearance inspection: Confirm that the grooved steel bar 1 (inverted convex shape) is free from deformation and cracks, and that the slide rail 2 groove is free from rust, welding slag and other impurities; the surface of the slider 3 is smooth and fits smoothly with the slide rail 2 without jamming; the surface of the switch magnet 4 is free from oil stains (oil stains will weaken the magnetism), and the magnetic switch opens and closes flexibly (a clear "click" locking sound can be heard when the switch is toggled); the handle of the push-pull clamp 5 is not broken, and the bolts connecting the jaws and the steel bar are not loose.

[0025] Tooling component functional test: Insert slider 3 into slide rail 2 and push slider 3 to slide along slide rail 2 throughout its entire range; attach switch magnet 4 to standard steel plate and confirm that the magnetism meets the standard; operate push-pull clamp 5, and when the handle is pulled, the clamp moves the steel bar smoothly without jamming.

[0026] Step 2 Before use, adjust the position of the switch magnet 4 according to the drawings and lock it in place with the locking pin. Prepare concrete 9 according to the design ratio. Before pouring, test the workability of concrete 9 to ensure that there is no segregation or bleeding. Pour concrete 9 into the cavity between the two side molds 6. After the concrete 9 is poured or is about to be poured, place the assembled slot fixture in the corresponding position of the side mold 6 according to the pre-marked position, and turn on the switch magnet 4 to fix the entire slot fixture on the side mold 6. This completes the preliminary device assembly and setup work.

[0027] After the concrete is poured, it is vibrated and cured. The top of the side formwork is covered with plastic film to prevent the moisture from evaporating too quickly. It is left to cure until the concrete is initially set. After the concrete is initially set, the surface strength of the concrete is tested with a rebound hammer to ensure that it can bear the weight of the I-beam 8.

[0028] Step 3 After the concrete 9 has completely solidified, remove the plastic film on top of the side formwork and clean up any debris on the outside of the side formwork; check the connection between the slot fixture and the concrete 9 to ensure there is no loosening or detachment. Activate the "unlock switch" of the two switch magnets 4 to release the magnetic connection between the slider 3 and the switch magnets 4; hold the push-pull clamps 5 on both sides of the lower protruding section of the slot steel bar 1 with both hands, palms facing outwards, and slowly pull the clamps to move the slot steel bar 1 vertically upwards. After removing the slot fixture, hoist the I-beam 8 to the target location for installation.

[0029] Step 4 Tooling cleaning: Use a wire brush to remove residual concrete from the surfaces of the groove steel bar 1, slider 3, and switch magnet 4 (to avoid difficulty in cleaning after the concrete hardens), then rinse the tooling surface with a high-pressure water gun, and finally wipe it dry with a cloth to prevent rust.

[0030] Reuse inspection: After cleaning, inspect the tooling components again (same as the functional test in step 1). If the sliding resistance of slider 3 increases, apply a small amount of grease to the slide rail 2. If the magnetism of switch magnet 4 weakens, the internal core of the magnet needs to be replaced. After confirming that the components are intact, transfer the tooling to the next set of side molds 6 and repeat steps 1-4 to carry out the opening operation of the slot 7 of the next batch of I-beams 8.

Claims

1. A notching tool for application to a light I-beam, characterised in that: Includes a slotted steel bar (1), the slotted steel bar (1) is inverted convex, and the two ends of the straight section of the slotted steel bar (1) are respectively provided with slide rails (2), and a slider (3) is slidably provided on the slide rails (2), and a switch magnet (4) is connected to the bottom of the slider (3) by bolts.

2. The slotting fixture for a lightweight I-beam according to claim 1, characterized in that: Push-pull clamps (5) are respectively installed on both sides of the straight section on both sides of the protruding section at the lower end of the grooved steel bar (1).

3. A slotting fixture for a lightweight I-beam according to claim 1 or 2, characterized in that: The lower end of the grooved steel bar (1) has two cross sections on both sides of the protruding section. The upper half of the cross section is rectangular and the lower half is an isosceles trapezoid.

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