Adjustable I-beam connecting bracket and steel arch welding method

Abstract

The present invention discloses an adjustable I-beam connecting bracket, comprising a base, a steel plate support and a plurality of I-beam supports installed on the base, the I-beam supports are distributed on both sides of the steel plate support; the steel plate support comprises a steel plate jack fixedly installed on the base, a steel plate platform for supporting the connecting steel plate is installed on the top of the steel plate jack, and at least one pair of screw clips for clamping two connecting steel plates are installed on the steel plate platform; the I-beam support comprises an I-beam jack installed on the base, an I-beam platform for supporting the I-beam is installed on the top of the I-beam jack, and at least one pair of tensioning clips for clamping both sides of the I-beam flange are installed on the I-beam platform. The present invention is applicable to the welding and butt jointing of I-beams and connecting steel plates of different sizes. The present invention also provides a corresponding method for precise butt welding of tunnel primary support steel arch frames.

Description

Technical Field

[0001] The invention relates to an initial support technology for tunnel construction, in particular to an adjustable I-beam connecting bracket and a steel arch frame welding method. Background Art

[0002] During the tunnel construction process, the primary steel arch frame is the first load-bearing structure of the tunnel. Its main functions are: 1. Support the surrounding rock before the shotcrete takes effect; 2. Reinforce the shotcrete; 3. Serve as a fulcrum for advance support; 4. Play the role of initial support together with anchor rods and shotcrete. So in summary, the primary steel arch frame of the tunnel must have sufficient strength and meet the curvature requirements of the tunnel contour line, so the size of its deformation will affect the overall stress condition and stability of the tunnel; the strength of the steel arch frame is not only related to the strength of the I-beam, but also to the smoothness of the connection between the arch frames. When the connection between the arch frames is not smooth, the stress condition of the arch frame will change, making the arch frame connection a weak stress point, which will deform under the pressure of the surrounding rock, and then endanger the safety of tunnel construction.

[0003] At present, the steel arch frame in tunnel construction is mainly connected by connecting steel plates and bolts, and the welding of I-beams and connecting steel plates uses positioning fixtures. However, the positioning fixture can only fix one piece of I-beam and connecting steel plate, and the connection accuracy is not easy to control, which leads to the initial support of the steel arch frame. Dislocation is easy to occur at the connection part, changing the force direction of the steel arch frame. Under the compressive stress of the surrounding rock, it is very easy to deform, endangering the construction safety. Therefore, it is necessary to develop a new type of I-beam connecting bracket, which can not only accurately weld the connecting steel plates, but also ensure that the connection part of the steel arch frame is not bad, and ensure the stability of the steel arch frame. Summary of the invention

[0004] In view of the above background technology, the present invention provides an adjustable I-beam connecting bracket, which provides a more efficient, faster and more convenient welding method for connecting the primary support steel arch frame of the tunnel.

[0005] An adjustable I-beam connecting bracket comprises a base, on which a steel plate support and a plurality of I-beam supports are installed, and the I-beam supports are distributed on both sides of the steel plate support; the steel plate support comprises a steel plate jack fixedly installed on the base, a steel plate platform for supporting the connecting steel plate is installed on the top of the steel plate jack, and at least one pair of screw clips for clamping two connecting steel plates is installed on the steel plate platform; the I-beam support comprises an I-beam jack installed on the base, an I-beam platform for supporting the I-beam is installed on the top of the I-beam jack, and at least one pair of tension clamps for clamping both sides of the I-beam flange are installed on the I-beam platform.

[0006] Furthermore, the I-beam support includes a No. 1 I-beam support and a No. 2 I-beam support, wherein the No. 1 I-beam support is fixedly mounted on the base, and the No. 2 I-beam support can be mounted on the base close to or away from the steel plate support via a slideway. The maximum top loads of the I-beam jacks and the steel plate jacks of the No. 1 I-beam support and the No. 2 I-beam support are both 1 t, and the maximum sliding distance of the slideway is 100 cm.

[0007] Furthermore, a first slide groove is provided on the steel plate platform, and the screw clamp can be slidably installed on the first slide groove. A pair of the screw clamps can be adjusted within a range of 15 to 25 cm along the center of the steel plate platform to match the size of the connected steel plate.

[0008] Furthermore, a second slide groove is provided on the I-beam platform, and the tension clamps can be slidably installed on the second slide groove. A pair of the tension clamps can be adjusted within a range of 16 to 24 cm along the center of the I-beam platform to match the size of the I-beam.

[0009] Furthermore, the I-beam platform is installed on the top of the I-beam jack through a movable plate, and the bottom of the movable plate is hinged to the top of the I-beam jack through a swing shaft, so that the swing angle of the I-beam platform can be adjusted to match the connection and installation of steel arch frames with different curvatures; wherein the swing shaft can be adjusted within a range of ±20° along the horizontal line.

[0010] Furthermore, the No. 1 I-beam support and the No. 2 I-beam support are symmetrically installed on both sides of the steel plate support, and the No. 2 I-beam support is placed on the outer side of the No. 1 I-beam support.

[0011] The present invention also provides a method for precise butt welding of tunnel primary support steel arch frames, wherein the height of the I-beam is supported and adjusted by the No. 1 I-beam support and the No. 2 I-beam support in the above-mentioned adjustable I-beam connecting bracket, the height of the connecting steel plate is supported and adjusted by the steel plate support, and the spacing of the screw clips is adjusted according to the size of the connecting steel plate, so as to fix the two connecting steel plates; the position of the No. 2 I-beam support on the slideway is adjusted so that the distance between the No. 1 I-beam support and the No. 2 I-beam support meets the length requirement of the I-beam; the position of the pulling clamps of the No. 1 I-beam support and the No. 2 I-beam support is adjusted to fix the I-beam; the height of the No. 1 I-beam support and the No. 2 I-beam support is adjusted according to the curvature of the I-beam, so that the butt ends of the two I-beams are flush with the connecting steel plate; screws are inserted into the alignment screw holes of the two connecting steel plates for trial connection; and finally, welding is performed at the connection between the I-beam and the connecting steel plate.

[0012] The present invention provides a method for precise docking and welding of the initial steel arch frame of the tunnel, which only requires one person to operate, and through the flexible rotation of the movable shaft and the movable plate, the precise docking of I-beams and connecting steel plates of different curvatures can be achieved. While reducing labor intensity and labor costs, the welding quality and accuracy of the I-beams and connecting steel plates can be improved, ensuring the installation quality of the initial steel arch frame of the tunnel. In addition, the present invention can effectively improve work efficiency, shorten working hours, and has good application prospects.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention can be applied to the welding and butt jointing of I-beams of different sizes and connecting steel plates, thereby improving the butt jointing quality of steel arch frames and ensuring the stability and stress state of the steel arch frames.

[0015] 2. Simple and easy to operate, the adjustment system and slide system can realize the welding and docking of I-beams with different curvatures and lengths, improve work efficiency and save labor costs.

[0016] 3. Simple structure, easy to maintain, and has good promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural front view of the present invention;

[0018] Figure 2 This is a front view of the steel plate support structure of the present invention;

[0019] Figure 3 This is a front view of the No. 1 I-beam support structure of the present invention;

[0020] Figure 4 This is the front view of the No. 2 I-beam support structure of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings. Figure 1 As a reference standard.

[0022] An adjustable I-beam connecting bracket, such as Figures 1 to 4 As shown, it includes a base 10, on which a steel plate support 1 and a plurality of I-beam supports are installed, and the I-beam support includes a No. 1 I-beam support 2 and a No. 2 I-beam support 3, and the No. 1 I-beam support 2 and the No. 2 I-beam support 3 are symmetrically distributed on both sides of the steel plate support 1; the No. 2 I-beam support 2 is placed on the outer side of the No. 1 I-beam support 1 (such as Figure 1As shown); the steel plate support 1 includes a steel plate jack 41 fixedly mounted on the base 10, a steel plate platform 161 for supporting the connecting steel plate 8 is installed on the top of the steel plate jack 41, and at least one pair of hand-tightened screw clips 12 for clamping two connecting steel plates 8 are installed on the steel plate platform 161, and there are four alignment screw holes 13 on the connecting steel plate 8, and the alignment screw holes 13 can improve the connection accuracy of the two I-beams 5; the No. 1 I-beam support 2 and the No. 2 I-beam support 3 both include an I-beam jack 42 installed on the base 10, wherein the I-beam jack 42 of the No. 1 I-beam support 2 is fixedly mounted on the base 10 On the upper side, the I-beam jack 42 of the No. 2 I-beam support 3 is fixed on the upper slide 11, the upper slide 11 is connected to the lower slide 9 through the roller 17, the lower slide 9 is fixed on the base 10, the upper slide 11, the roller 17 and the lower slide 9 form a slide, the maximum slide distance of the slide is 100cm, so that the No. 2 I-beam support 3 can be adjusted to the left or right (close or far away) and installed on the base 10, and the slide system can be used to position I-beams of different lengths; an I-beam platform 162 for supporting the I-beam is installed on the top of the I-beam jack 42, and at least one pair of tension clamps 15 for clamping the two sides of the flange of the I-beam 5 are installed on the I-beam platform 162.

[0023] The maximum top loads of the I-beam jacks 42 and the steel plate jacks 41 of the No. 1 I-beam support 2 and the No. 2 I-beam support 3 are both 1 t.

[0024] Furthermore, a first slide groove 14 is provided on the steel plate platform 161, and the screw clip 12 can be slidably installed on the first slide groove 141. A pair of the screw clips 12 can be adjusted within the range of 15 to 25 cm along the center of the steel plate platform 131 to match the size of the connecting steel plate 8.

[0025] Furthermore, a second slide groove 142 is provided on the I-beam platform 162, and the tension clamp 15 can be slidably installed on the second slide groove 142. A pair of the tension clamps 142 can be adjusted within the range of 16 to 24 cm along the center of the I-beam platform 162 to match the size of the I-beam.

[0026] Furthermore, the top of the I-beam jack 42 is installed with the I-beam platform 162 via a movable plate 6, and the bottom of the movable plate 6 is hinged to the top of the I-beam jack 42 via a swing shaft 7, so that the swing angle of the I-beam platform 162 can be adjusted to match the connection and installation of the I-beams of steel arch frames with different curvatures; wherein the swing shaft 7 can be adjusted within a range of ±20° along the horizontal line.

[0027] The present invention also provides a method for precise butt welding of tunnel primary support steel arch frames, wherein the height of the I-beam is supported and adjusted by the No. 1 I-beam support and the No. 2 I-beam support in the above-mentioned adjustable I-beam connecting bracket, the height of the connecting steel plate is supported and adjusted by the steel plate support, and the spacing of the screw clips is adjusted according to the size of the connecting steel plate, so as to fix the two connecting steel plates; the position of the No. 2 I-beam support on the slideway is adjusted so that the distance between the No. 1 I-beam support and the No. 2 I-beam support meets the length requirement of the I-beam; the position of the pulling clamps of the No. 1 I-beam support and the No. 2 I-beam support is adjusted to fix the I-beam; the height of the No. 1 I-beam support and the No. 2 I-beam support is adjusted according to the curvature of the I-beam, so that the butt ends of the two I-beams are flush with the connecting steel plate; screws are inserted into the alignment screw holes of the two connecting steel plates for trial connection; and finally, welding is performed at the connection between the I-beam and the connecting steel plate.

[0028] The present invention provides a method for precise docking and welding of the initial steel arch frame of the tunnel, which only requires one person to operate, and through the flexible rotation of the movable shaft and the movable plate, the precise docking of I-beams and connecting steel plates of different curvatures can be achieved. While reducing labor intensity and labor costs, the welding quality and accuracy of the I-beams and connecting steel plates can be improved, ensuring the installation quality of the initial steel arch frame of the tunnel. In addition, the present invention can effectively improve work efficiency, shorten working hours, and has good application prospects.

[0029] The above is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the patent of the present invention.

Claims

1. An adjustable I-beam connecting bracket, comprising a base, characterized in that: A steel plate support and a plurality of I-beam supports are installed on the base, and the I-beam support includes a No. 1 I-beam support and a No. 2 I-beam support, and the No. 1 I-beam support and the No. 2 I-beam support are distributed on both sides of the steel plate support; the No. 1 I-beam support is fixedly installed on the base, and the No. 2 I-beam support is fixed on an upper slide, and the upper slide is connected to the lower slide through a roller, and the lower slide is fixed on the base, and the upper slide, the roller and the lower slide form a slide, so that the No. 2 I-beam support can be adjustably installed on the base, so as to realize the two The I-beam support is close to or far away from the steel plate support; the steel plate support includes a steel plate jack fixedly installed on the base, a steel plate platform for supporting the connecting steel plate is installed on the top of the steel plate jack, and at least one pair of screw clips for clamping two connecting steel plates are installed on the steel plate platform; the I-beam support includes an I-beam jack installed on the base, an I-beam platform for supporting the I-beam is installed on the top of the I-beam jack, and at least one pair of tension clamps for clamping both sides of the I-beam flange are installed on the I-beam platform.

2. The adjustable I-beam connecting bracket according to claim 1, characterized in that: The maximum top load of the steel plate jack and the I-beam jack is 1 t.

3. The adjustable I-beam connecting bracket according to claim 1, characterized in that: The steel plate platform is provided with a first sliding groove, and the screw clamp is slidably mounted on the first sliding groove.

4. The adjustable I-beam connecting bracket according to claim 3, characterized in that: The screw clamp can be adjusted within a range of 15 to 25 cm along the center of the steel plate platform.

5. The adjustable I-beam connecting bracket according to claim 1, characterized in that: The I-beam platform is provided with a second slide groove, and the tension clamp is slidably mounted on the second slide groove.

6. The adjustable I-beam connecting bracket according to claim 5, characterized in that: The tension clamp can be adjusted within a range of 16 to 24 cm along the center of the I-beam platform.

7. The adjustable I-beam connecting bracket according to claim 1, characterized in that: The maximum sliding distance of the slide is 100 cm.

8. The adjustable I-beam connecting bracket according to claim 1 or 7, characterized in that: The top of the I-beam jack is mounted with the I-beam platform via a movable plate, the bottom of the movable plate is hinged with the top of the I-beam jack via a swing shaft, and the swing shaft can be swung and adjusted within a range of ±20° along the horizontal line.

9. A method for precise butt welding of tunnel primary support steel arch frames, characterized in that: Using the adjustable I-beam connecting bracket described in claim 1, firstly, the height of the connecting steel plate is supported and adjusted by the steel plate support, and the spacing of the screw clips is adjusted according to the size of the connecting steel plate, so as to fix the two connecting steel plates; the position of the No. 2 I-beam support on the slideway is adjusted so that the distance between the No. 1 I-beam support and the No. 2 I-beam support meets the length requirement of the I-beam; Adjust the position of the tension clamps of the No. 1 I-beam support and the No. 2 I-beam support to fix the I-beam; then adjust the height of the No. 1 I-beam support and the No. 2 I-beam support according to the curvature of the I-beam, so that the butt ends of the two I-beams are flush with the connecting steel plates; insert screws into the positioning screw holes of the two connecting steel plates for a trial connection; finally, weld at the connection between the I-beam and the connecting steel plate.

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