End-reinforced concrete crane beam

Abstract

The utility model discloses an end-reinforced concrete crane beam, which comprises a concrete crane beam main body and a reinforcing steel member, the reinforcing steel member is placed in the 1 / 4 span range of the end part of the concrete crane beam main body, and a middle beam is designed into a shape consistent with bending moment distribution. The reinforcing steel member is designed into a shape which is consistent with the shearing force distribution of the end part, is approximately trapezoidal, has a double-T-shaped cross section, and is gradually reduced in height from the end part, transverse stiffening ribs are arranged on the inner sides of webs on the two sides, and studs are welded on an inclined plane, so that the connection between the member and concrete is enhanced. The crane beam is different from a common reinforced concrete crane beam, the shape of the reinforced steel member placed in the end shear-resistant area is consistent with the distribution of end shear force, the gradually-changed section height of the member enables the rigidity of the end to be stably transited to the middle concrete section, the shear-resistant performance of the end of the crane beam is enhanced, and meanwhile the utilization rate of materials is improved. The stress concentration phenomenon is relieved, and therefore the purposes of saving steel and reducing self weight are achieved.

Description

Technical Field

[0001] This utility model relates to the field of industrial building structure technology, specifically to a concrete crane beam with a novel steel component placed at one end. Background Technology

[0002] Currently, traditional reinforced concrete crane beams often have excessively large cross-sectional heights to ensure end strength, making them difficult to meet factory building requirements. Under dynamic loads, ordinary reinforced concrete crane beams are prone to concrete cracking, leading to reduced overall beam durability and fatigue life, and increased maintenance costs. While traditional steel crane beams offer advantages such as lightweight and high strength, their corrosion resistance and fire resistance are poor, requiring additional anti-corrosion and fireproofing treatments, increasing construction costs. Existing steel-concrete crane beams typically use H-beams along the entire length or at the ends, resulting in low steel utilization efficiency and stress concentration at the connection between the steel and concrete sections. Summary of the Invention

[0003] Purpose of the utility model: In order to solve the problem of excessive cross-sectional height and insufficient durability of existing reinforced concrete crane beams, this utility model provides a concrete crane beam with end reinforcement. A new type of steel component is placed in the end shear zone to enhance the end shear resistance of the beam, thereby effectively reducing the beam end cross-sectional height, improving structural durability and material utilization efficiency, and reducing costs.

[0004] The technical solution adopted by this utility model is: a concrete crane beam with end reinforcement, including a concrete crane beam body, reinforcing steel components, studs and transverse stiffening ribs;

[0005] The middle beam of the concrete crane beam body is set in a shape consistent with the bending moment distribution, and reinforcing steel components are placed in the end 1 / 4 span of the concrete crane beam body.

[0006] The reinforcing steel member is configured in a shape consistent with the end shear force distribution, approximately trapezoidal, with a double T-shaped cross section, and its height decreases from the end. The reinforcing steel member has webs on both sides, and inclined planes are provided on the webs on both sides.

[0007] Studs are welded onto the inclined plane to enhance the effective connection between it and the concrete, and transverse stiffening ribs are arranged on the inner side of the two web plates to ensure the rigidity of the web plates.

[0008] Preferably, two rows of studs are symmetrically welded on the inclined plane of the reinforcing steel member. The studs are perpendicular to the inclined plane, and the spacing between each row of studs gradually increases as the cross-sectional height decreases, but does not exceed 4 times the stud height.

[0009] Preferably, transverse stiffening ribs are arranged on the inner side of the webs on both sides of the reinforcing steel member, and the spacing between the transverse stiffening ribs decreases as the cross-sectional height decreases.

[0010] Preferably, the bottom of the reinforcing steel member is welded to the surrounding stirrups.

[0011] The beneficial effects of this utility model are:

[0012] 1. New steel components are placed in the end shear zone to enhance the end shear performance of the beam. The shear force at the beam end is mainly borne by the steel components, which effectively reduces crack generation and improves structural durability. The shape of the new steel components is consistent with the end shear force distribution, which improves material utilization. The gradually changing section height can make the end stiffness smoothly transition to the middle concrete section, avoiding stress concentration. The middle beam is designed with a shape consistent with the bending moment distribution, which can effectively ensure the strength of the middle part of the crane beam.

[0013] 2. Transverse stiffening ribs are arranged on the inner side of the web of the steel component to ensure the stiffness of the web. Studs are welded on the inclined plane to fix the steel component and enhance the effective connection between it and the concrete. This structure can effectively restrain the deformation of the concrete, inhibit the expansion of cracks, avoid relative slippage between the inclined plane and the concrete, and improve the fatigue resistance and service life of the crane beam.

[0014] 3. The advantages of steel and concrete complement each other. Reinforcing steel components are placed at the ends to solve the problem of excessively high beam sections in traditional concrete crane beams. At the same time, concrete can effectively protect the internal steel components, solving the problem of poor fire resistance and corrosion resistance in traditional steel crane beams, thereby saving construction and maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the end-reinforced concrete crane beam structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the reinforced steel component structure of this utility model.

[0017] Reference numerals: 1. Main body of concrete crane beam; 2. Reinforcing steel component; 3. Stud; 4. Transverse stiffening rib. Detailed Implementation

[0018] The entire technical solution will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] See Figure 1 and Figure 2 A concrete crane beam with end reinforcement includes a concrete crane beam body 1, a new type of steel component 2, studs 3, and transverse stiffening ribs 4;

[0020] The middle beam of the concrete crane beam body 1 is set in a shape consistent with the bending moment distribution, and a reinforcing steel member 2 is placed in the end 1 / 4 span of the concrete crane beam body 1.

[0021] The reinforcing steel member 2 is configured in a shape consistent with the end shear force distribution, approximately trapezoidal, with a double T-shaped cross section, and the height decreases from the end. The reinforcing steel member 2 has webs on both sides, and inclined planes are provided on the webs on both sides.

[0022] Studs 3 are welded onto the inclined plane to enhance the effective connection between the studs and the concrete. Transverse stiffening ribs 4 are arranged on the inner side of the two web plates to ensure the rigidity of the web plates.

[0023] Two rows of studs 3 are symmetrically welded on the inclined plane of the reinforcing steel member 2. The studs 3 are perpendicular to the inclined plane, and the spacing between each row of studs 3 gradually increases as the cross-sectional height decreases, but does not exceed four times the height of the studs 3. Transverse stiffening ribs 4 are arranged on the inner side of the webs on both sides of the reinforcing steel member 2, and the spacing between the transverse stiffening ribs 4 decreases as the cross-sectional height decreases. The bottom of the reinforcing steel member 2 is welded to the surrounding stirrups.

[0024] This utility model features a small beam end section height, high durability, and high fatigue resistance. See [link to related documentation] Figure 1 and Figure 2 This includes the following steps:

[0025] Step 1: Fabricate the reinforcing steel component 2. Fabricate a trapezoidal web of the required size and weld transverse stiffening ribs 4 onto the web. Weld the two webs onto the steel plate.

[0026] Step 2: Process the reinforcing steel component 2, and symmetrically weld two rows of studs 3 on the inclined plane using electric arc stud welding.

[0027] Step 3: Tie the reinforcing cage. Place the reinforcing steel component 2 in the corresponding position of the reinforcing cage and weld its bottom to the surrounding stirrups for fixation.

[0028] Step 4: Set up the template and apply release agent.

[0029] Step 5: Place the tied and fixed reinforcing member 2 and the steel cage into the formwork.

[0030] Step 6: Pour concrete, mixing it with a vibrator while pouring, and make cubic test blocks during the pouring process to measure the physical and mechanical properties of the concrete.

[0031] Step 7: Remove the formwork one day after the specimen is poured, and use indoor curing conditions in winter for 28 days.

[0032] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. It should be noted that for those skilled in the art, several modifications, equivalent substitutions, and improvements can be made without departing from the principles of this utility model, and these modifications, equivalent substitutions, and improvements should also be considered within the protection scope of this utility model.

Claims

1. A reinforced concrete crane beam, characterized in that: This includes the main concrete crane beam, reinforcing steel components, studs, and transverse stiffening ribs; The middle beam of the concrete crane beam body is set in a shape consistent with the bending moment distribution, and reinforcing steel components are placed in the end 1 / 4 span of the concrete crane beam body. The reinforcing steel member is configured in a shape consistent with the end shear force distribution, approximately trapezoidal, with a double T-shaped cross section, and its height decreases from the end. The reinforcing steel member has webs on both sides, and inclined planes are provided on the webs on both sides. Studs are welded onto the inclined plane, and transverse stiffening ribs are arranged on the inner side of the two side webs.

2. The end-reinforced concrete crane beam according to claim 1, characterized in that: Two rows of studs are symmetrically welded on the inclined plane of the reinforcing steel member. The studs are perpendicular to the inclined plane. The spacing between the studs in each row gradually increases as the cross-sectional height decreases, but does not exceed 4 times the stud height.

3. The end-reinforced concrete crane beam according to claim 1, characterized in that: The inner sides of the webs on both sides of the reinforced steel member are provided with transverse stiffening ribs, and the spacing between the transverse stiffening ribs decreases as the cross-sectional height decreases.

4. The end-reinforced concrete crane beam according to claim 1, characterized in that: The bottom of the reinforced steel component is welded to the surrounding stirrups.

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