Steel structure self-anchoring expansion joint connecting device

Abstract

The invention discloses a steel structure self-anchoring expansion joint connecting device which comprises a steel column, a steel beam and a support. The support is arranged on the steel column, used for supporting the steel beam and composed of a support bottom steel plate, a support vertical steel plate and a support top steel plate, the support top steel plate is provided with a round bolt hole, a steel beam lower flange is provided with a strip-shaped hole, the steel beam lower flange is supported on the support top steel plate, and the steel beam lower flange and the support top steel plate are in sliding connection in a longitudinal moving mode along the strip-shaped hole through self-anchoring bolts; the self-anchoring bolt comprises a screw, a sleeve, a nut and a gasket, the screw penetrates through the round bolt hole and the strip-shaped hole, the width of the strip-shaped hole is larger than the outer diameter of the sleeve, the inner diameter of the sleeve is larger than or equal to the inner diameter of the round bolt hole, the sleeve is sleeved on the circumference of the screw and supported on the steel plate at the top of the support, and the upper end face of the sleeve is higher than the upper surface of the lower flange of the steel beam. A gasket is arranged on the upper end face of the sleeve, and the sleeve is pressed on a steel plate on the top of the support through a screwing nut. The sliding function of the steel beam on the support can be achieved to the maximum extent.

Description

Technical Field

[0001] This invention belongs to the field of building engineering, and specifically relates to a self-anchoring expansion joint connection device for steel structures. Background Technology

[0002] In the design and implementation of modern steel structures, the impact of temperature stress cannot be ignored. Steel structures experience significant thermal expansion and contraction under temperature changes. When the length exceeds a certain range, the lack of expansion joints may lead to cracks or structural failure due to accumulated deformation. Expansion joints, by disconnecting the structure, allow each part to expand and contract independently, avoiding the concentration of internal forces.

[0003] Currently, expansion joints are typically connected by creating grooves to allow sliding at one end, or by directly creating elliptical holes in the web or flange of the steel beam to achieve the sliding function. However, existing methods all have their limitations, and the sliding effect is not maximized.

[0004] CN110924529B discloses a sliding connection structure for steel roof trusses and an industrial plant. This sliding connection structure includes a steel roof truss support, a wear-resistant lubricating plate, a lubricating plate limiting frame, and a cantilever support arranged along the Z-axis. The lubricating plate, lubricating plate limiting frame, and cantilever support are relatively fixed, while the steel roof truss support can move horizontally on the wear-resistant lubricating plate. This method can achieve the sliding connection function of expansion joints to a certain extent, but the first and second positioning lower plates will affect the sliding of the joint to some extent.

[0005] CN202450625U discloses a sliding connection device for steel structure expansion joints. This device achieves the sliding function of the expansion joint joint by setting grooves on the flanges and webs of the steel beam, and adds limiting bolts to prevent the grooves from falling off due to excessive displacement. While this device can achieve a certain degree of sliding connection for the expansion joint, because the beam mainly bears vertical loads, the top grooves bear very little load; the main load-bearing components are the side grooves and the bottom contact surface, thus weakening the sliding connection function. Summary of the Invention

[0006] To address the technical problem of weak sliding function in existing technologies, this invention provides a self-anchoring expansion joint connection device for steel structures.

[0007] The steel structure self-anchoring expansion joint connection device provided by the present invention includes a steel column, a steel beam, and a support. The support is set on the steel column to support the steel beam and is composed of a bottom steel plate, a vertical steel plate, and a top steel plate fixedly connected from bottom to top. The top steel plate of the support has a circular bolt hole, and the lower flange of the steel beam has a strip hole. The lower flange of the steel beam is supported on the top steel plate of the support. The two are connected by a self-anchoring bolt that passes through the circular bolt hole and the strip hole, forming a sliding connection that moves longitudinally along the strip hole. The self-anchoring bolt includes four parts: a screw, a sleeve, a nut, and a washer. The screw passes through the circular bolt hole and the strip hole. The width of the strip hole is greater than the outer diameter of the sleeve, and the inner diameter of the sleeve is greater than or equal to the inner diameter of the circular bolt hole. The sleeve is fitted on the circumference of the screw and supported on the top steel plate of the support. The upper end face of the sleeve is higher than the upper surface of the lower flange of the steel beam. A washer is set on the upper end face of the sleeve. The sleeve is pressed tightly onto the top steel plate of the support by tightening the nut.

[0008] As an improvement, a low-friction pad, such as a polytetrafluoroethylene plate, is installed between the lower flange of the steel beam and the top steel plate of the support. Its friction coefficient does not exceed 0.1, which is much smaller than the friction coefficient between steel plates, enabling the two to smoothly slide.

[0009] As an improvement, steel column stiffening plates are installed on the steel column at positions corresponding to the top and bottom steel plates of the support to enhance the stability of the steel column.

[0010] As an improvement, the vertical steel plate of the support is positioned at the center of the steel column to support the top steel plate of the support, and the width of the bottom steel plate of the support is the same as the width of the steel column. The length of the top steel plate of the support is determined according to the sliding length required by the expansion joint.

[0011] Generally, the inner diameter of the sleeve should be 1-2 mm larger than the inner diameter of the circular bolt hole, the sleeve wall thickness should be 3-5 mm, and the upper end face of the sleeve should be 2-3 mm higher than the upper surface of the lower flange of the steel beam. This is to ensure that the nut and washer do not contact the upper surface of the lower flange of the steel beam, and to avoid the preload of the nut being applied to the steel beam, which would reduce the sliding function of the expansion joint.

[0012] Generally, the inner diameter of the circular bolt hole should be 2-3 mm larger than the bolt diameter to allow the bolt to pass through smoothly. The length of the strip hole is determined according to the required sliding length of the expansion joint, and the width of the strip hole should be 2-3 mm larger than the outer diameter of the sleeve to ensure that the steel beam slides smoothly without falling off.

[0013] The present invention has the following beneficial effects:

[0014] 1) By setting supports on steel columns and slotted holes on steel beams, self-anchoring bolts are used to ensure that the steel beams will not fall off the supports, so that the steel beams can achieve the maximum sliding function on the supports.

[0015] 2) By setting low-friction pads, the steel beam can slide more fully on the supports;

[0016] 3) The vertical steel plate of the support is set in the center of the steel column to support the top steel plate of the support. The bottom steel plate has the same width as the steel column. The three steel plates are simple and beautiful and are used to support the steel beam.

[0017] 4) This invention is not only applicable to expansion joints connecting steel beams and columns, but can also be used to set supports on steel beams to achieve the purpose of sliding expansion joints. Attached Figure Description

[0018] Figure 1 This is a front view of the steel structure self-anchoring expansion joint connection device described in this invention.

[0019] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0020] Figure 3 This is an enlarged schematic diagram of the strip-shaped hole on the lower flange of the steel beam.

[0021] In the diagram: 1. Steel column; 2. Steel beam; 3. Steel column stiffening plate; 4. Bottom steel plate of the support; 5. Vertical steel plate of the support; 6. Top steel plate of the support; 7. Low-friction pad; 8. Screw; 9. Nut; 10. Washer; 11. Sleeve; 12. Strip hole; 13. Circular bolt hole; 14. Lower flange of the steel beam. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings:

[0023] like Figures 1-3 As shown, the steel structure self-anchoring expansion joint connection device provided by the present invention includes a steel column 1, a steel beam 2, and a support; the support is welded to the steel column 1 to support the steel beam 2, and is composed of a bottom steel plate 4, a vertical steel plate 5, and a top steel plate 6 fixedly connected from bottom to top. The top steel plate 6 is provided with a circular bolt hole 13, and the lower flange 14 of the steel beam is provided with a strip hole 12. The lower flange 14 of the steel beam is supported on the top steel plate 6 of the support. The two are connected by self-anchoring bolts passing through the circular bolt hole 13 and the strip hole 12 to form a longitudinal connection along the strip hole 12. The movable sliding connection; the self-anchoring bolt includes four parts: screw 8, sleeve 11, nut 9 and washer 10. Screw 8 passes through a circular bolt hole 13 and a strip hole 12. The width of the strip hole 12 is greater than the outer diameter of the sleeve 11, and the inner diameter of the sleeve 11 is greater than the inner diameter of the circular bolt hole 13. The sleeve 11 is fitted on the circumference of the screw 8 and supported on the top steel plate 6 of the support. The upper end face of the sleeve 11 is 2mm higher than the upper surface of the lower flange 14 of the steel beam. The washer 10 is provided on the upper end face of the sleeve 11. The sleeve 11 is pressed onto the top steel plate 6 of the support by tightening the nut 9.

[0024] A low-friction pad 7 is provided between the lower flange 14 of the steel beam and the top steel plate 6 of the support. Steel column stiffening plates 3 are respectively provided on the steel column 1 at positions corresponding to the top steel plate 6 and the bottom steel plate 4 of the support. The vertical steel plate 5 of the support is set at the center of the steel column 1 to support the top steel plate 6 of the support. The width of the bottom steel plate 6 of the support is the same as the width of the steel column 1.

[0025] This invention is not only applicable to expansion joints connecting steel beams and columns, but can also be used to set supports on steel beams to achieve the purpose of sliding expansion joints. Other components of this connection device are all within the protection scope of this invention.

Claims

1. A self-anchoring expansion joint connection device for steel structures, characterized in that: The system includes steel columns, steel beams, and supports. The supports, mounted on the steel columns, support the steel beams and consist of a bottom steel plate, a vertical steel plate, and a top steel plate, fixedly connected from bottom to top. The top steel plate has circular bolt holes, and the lower flange of the steel beam has a strip-shaped hole. The lower flange of the steel beam rests on the top steel plate, and the two are connected by self-anchoring bolts that pass through the circular bolt holes and the strip-shaped hole, forming a sliding connection that moves longitudinally along the strip-shaped hole. The self-anchoring bolt consists of a screw, a sleeve, a nut, and a washer. The screw passes through the circular bolt hole and the strip-shaped hole. The width of the strip-shaped hole is greater than the outer diameter of the sleeve, and the inner diameter of the sleeve is greater than or equal to the inner diameter of the circular bolt hole. The sleeve is fitted onto the circumference of the screw and supported on the top steel plate. The upper surface of the sleeve is higher than the upper surface of the lower flange of the steel beam. A washer is placed on the upper surface of the sleeve. The sleeve is pressed tightly against the top steel plate by tightening the nut.

2. The steel structure self-anchoring expansion joint connection device according to claim 1, characterized in that: A low-friction pad is installed between the lower flange of the steel beam and the top steel plate of the support.

3. The steel structure self-anchoring expansion joint connection device according to claim 1, characterized in that: Stiffening plates are respectively installed on the steel column at positions corresponding to the top steel plate and bottom steel plate of the support.

4. The steel structure self-anchoring expansion joint connection device according to claim 1, characterized in that: The vertical steel plate of the support is set at the center of the steel column to support the top steel plate of the support, and the width of the bottom steel plate of the support is the same as the width of the steel column.

5. The steel structure self-anchoring expansion joint connection device according to claim 2, characterized in that: Stiffening plates are respectively installed on the steel column at positions corresponding to the top steel plate and bottom steel plate of the support.

6. The steel structure self-anchoring expansion joint connection device according to claim 2, characterized in that: The low-friction pad is a polytetrafluoroethylene plate with a friction coefficient of no more than 0.1, which is much smaller than the friction coefficient between steel plates.

7. The steel structure self-anchoring expansion joint connection device according to any one of claims 1 to 6, characterized in that: The inner diameter of the sleeve is 1-2 mm larger than the inner diameter of the circular bolt hole, the sleeve wall thickness is 3-5 mm, and the upper end face of the sleeve is 2-3 mm higher than the upper surface of the lower flange of the steel beam.

8. The steel structure self-anchoring expansion joint connection device according to any one of claims 1 to 6, characterized in that: The inner diameter of the circular bolt hole is 2-3 mm larger than the diameter of the bolt, and the width of the strip hole is 2-3 mm larger than the outer diameter of the sleeve.

9. The steel structure self-anchoring expansion joint connection device according to claim 7, characterized in that: The inner diameter of the circular bolt hole is 2-3 mm larger than the diameter of the bolt, and the width of the strip hole is 2-3 mm larger than the outer diameter of the sleeve.

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