Steel reinforced concrete crane beam

Abstract

The utility model discloses a steel reinforced concrete crane beam. The steel reinforced concrete crane beam comprises a concrete beam main body and an internal steel structural member, the section steel component is designed into an inverted double-T-shaped section within the range of 1 / 4 span of the end, the height of a web plate is gradually decreased towards the midspan, the web plate is in a right triangle shape, stiffening ribs are arranged on the two sides of the web plate, the middle section is designed into an inverted T shape, the height of the web plate is 1 / 3 of the maximum height of the section of the end component, the two ends of the web plate are welded to steel partition plates, and studs are welded to the bottom of the section steel component. The crane beam is different from a common steel reinforced concrete crane beam, the end part is designed into an inverted double-T-shaped section, the shear resistance of the end part is enhanced by utilizing the double webs, the height change of the webs conforms to the shear distribution rule of the crane beam, bonding anchoring is provided for the bottom steel plate, the bending resistance of the middle part is mainly considered, and the section is simplified into an inverted T shape; the lower flange is used for replacing part of steel bars to be tensioned, the performance of the crane beam is enhanced, meanwhile, steel is fully utilized, and the purposes of saving materials and reducing self weight are achieved.

Description

Technical Field

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

[0002] With the continuous development of industrial technology, traditional reinforced concrete crane beams are gradually becoming insufficient to meet the needs of factory buildings due to their excessive cross-sectional height and susceptibility to concrete cracking. Traditional steel crane beams also have weak corrosion resistance and fire resistance, requiring additional anti-corrosion and fireproofing treatments, increasing construction and maintenance costs. Existing steel-concrete crane beams typically use H-beams along their entire length or at the ends. However, since the web portion of the H-beam primarily provides shear resistance, while the flange portion primarily provides bending resistance, and the upper flange contributes far less to bending performance than the upper concrete, this structure has low steel utilization efficiency and easily leads to material waste. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of low steel utilization rate in existing steel-concrete crane beams. It provides a steel-concrete crane beam with an inverted double-T cross-section at the end of the beam to fully utilize the shear resistance of the web and the bending resistance of the lower flange of the beam in the middle section. This improves the overall performance of the crane beam while making full use of steel and reducing costs.

[0004] The technical solution adopted in this utility model is: a steel-concrete crane beam, comprising a concrete beam body and steel components;

[0005] The steel structural member includes end webs, bottom steel plates, transverse stiffening ribs, middle webs, studs, and steel diaphragms;

[0006] The steel section member is designed with an inverted double T-shaped section in the end 1 / 4 span range. The end web is welded to the bottom steel plate. The height of the end web decreases towards the middle of the span, forming a right triangle. Transverse stiffening ribs are provided on both sides of the end web.

[0007] The middle section of the steel member is designed as an inverted T-shape. The middle web is welded to the bottom steel plate, and the two ends of the middle web are welded to the steel partitions. The two ends of the steel partitions are welded to the end webs.

[0008] The bottom of the steel component is welded with studs.

[0009] Preferably, the height of the middle web of the steel member is taken as the maximum height of the end steel member section, and the height of the steel partition in the steel member is consistent with the height of the middle web.

[0010] Preferably, two rows of studs are symmetrically welded to the bottom of the steel member, with the stud spacing gradually increasing from the end to the middle of the span.

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

[0012] 1. Since the web plate in the steel section plays the main role in shear resistance, the ends are designed with an inverted double T-shaped section. The double web plate enhances the shear resistance at the ends. The height of the web plate decreases towards the mid-span. The height change conforms to the shear force distribution law of the crane beam, which improves the utilization rate of steel, saves steel consumption, and can provide bonding anchorage for the bottom steel plate, strengthening the connection between the component and the concrete.

[0013] 2. The middle section mainly considers bending performance. Since the compressive strength of steel is much lower than that of concrete, the contribution of the upper flange of the steel section to bending performance is much smaller than that of the upper concrete. Therefore, the cross-section is simplified to an inverted T-shape to make full use of the superior tensile strength of steel. The lower flange of the member replaces part of the steel reinforcement for tension. The web height is designed to be only 1 / 3 of the maximum height of the end member section. This is used to increase the stiffness of the lower flange steel plate and its connection with the surrounding concrete. This design can make full use of steel while enhancing the performance of the crane beam, thereby saving materials and reducing self-weight.

[0014] 3. Two rows of symmetrical studs are welded to the bottom of the steel component to enhance the connection between the steel component and the concrete and resist relative slippage. In this invention, the advantages of steel and concrete are complementary. Double webs are used at the ends to increase shear resistance, solving the problem of excessively high beam ends in traditional concrete crane beams. The concrete effectively protects the internal steel components, addressing the poor fire resistance and corrosion resistance of traditional steel crane beams. The components are designed based on the contribution of each part of the steel to bending and shear resistance, solving the problem of low steel utilization in traditional steel-concrete crane beams. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a novel steel-concrete crane beam structure provided by this utility model.

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

[0017] Reference numerals: 1. End web; 2. Bottom plate; 3. Transverse stiffening rib; 4. Middle web; 5. Stud; 6. Steel diaphragm. 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 The present invention provides a steel-concrete crane beam, comprising a concrete beam body and steel components;

[0020] The steel structural member includes an end web 1, a bottom steel plate 2, transverse stiffening ribs 3, a middle web 4, studs 5, and steel partitions 6.

[0021] The steel section is designed as an inverted double T-shaped section within the end 1 / 4 span. The end web 1 is welded to the bottom steel plate 2. The height of the end web 1 decreases towards the middle of the span, forming a right triangle. Transverse stiffening ribs 3 are provided on both sides of the end web 1.

[0022] The middle section of the steel member is designed as an inverted T-shape. The middle web 4 is welded to the bottom steel plate 2. The height of the middle web 4 is 1 / 3 of the maximum height of the end steel member section. The two ends of the middle web 4 are welded to the steel partition 6, and the two ends of the steel partition 6 are welded to the end web 1.

[0023] Two rows of studs 5 are symmetrically welded to the bottom of the steel component, with the stud spacing gradually increasing from the end to the middle of the span.

[0024] This utility model features a small cross-sectional height, high material utilization, and high durability and fatigue resistance. (See also...) Figure 1 and Figure 2 This includes the following steps:

[0025] Step 1: Fabricate steel components. Fabricate the end web 1 and middle web 4 of the required size. Weld transverse stiffening ribs 3 on both sides of the end web 1. Weld the end web 1 to the bottom steel plate 2 and weld steel partitions 6 at the corresponding positions. Then weld the middle web 4 to the bottom steel plate 2 and weld both ends to the steel partitions 6.

[0026] Step 2: Weld two rows of studs 5 symmetrically under the bottom steel plate 2 using electric arc stud welding.

[0027] Step 3: Tie the reinforcing cage and place the steel components in the corresponding positions within the reinforcing cage.

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

[0029] Step 5: Place the tied and fixed rigid structural members and 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 specific embodiments described above further illustrate the purpose and technical solution of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A type of steel-concrete composite crane beam, characterized in that: Includes the main concrete beams and steel structural components; The steel structural member includes end webs, bottom steel plates, transverse stiffening ribs, middle webs, studs, and steel diaphragms; The steel section member is designed with an inverted double T-shaped section in the end 1 / 4 span range. The end web is welded to the bottom steel plate. The height of the end web decreases towards the middle of the span, forming a right triangle. Transverse stiffening ribs are provided on both sides of the end web. The middle section of the steel member is designed as an inverted T-shape. The middle web is welded to the bottom steel plate, and the two ends of the middle web are welded to the steel partitions. The two ends of the steel partitions are welded to the end webs. The bottom of the steel component is welded with studs.

2. The steel-concrete composite crane beam according to claim 1, characterized in that: The height of the web in the middle of the steel member is taken as 1 / 3 of the maximum height of the end steel member section.

3. A steel-concrete composite crane beam according to claim 2, characterized in that: The height of the steel partition in the steel structure is the same as that of the central web.

4. A steel-concrete composite crane beam according to claim 3, characterized in that: The bottom of the steel component is symmetrically welded with two rows of studs, and the spacing between the studs gradually increases from the end to the middle of the span.

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