Fabricated rotatable bridgehead steel transition slab under heavy traffic of surface mine

Abstract

An assembly type rotatable bridgehead steel transition slab under surface mine heavy traffic comprises H-shaped steel longitudinal beams, transverse partition plates, anti-sliding steel panels, connecting pin shafts, TST elastic plastic bodies, sleeper beams, expansion joint steel plates, steel bridge steel box girders and steel bridge abutment cover beams. The H-shaped steel longitudinal beams are arranged at equal intervals in the transverse bridge direction, the transverse partition plates are arranged in the longitudinal bridge direction, and the anti-sliding steel panel is arranged on the H-shaped steel and connected with the H-shaped steel and the transverse partition plates into a whole. The rotating steel plate is used for connecting the main beam web and the H-shaped steel web of the butt strap, and the rotating pin shaft penetrates through the lug plate to connect the main beam and the butt strap into a whole to achieve the rotating purpose. The TST elastic-plastic body is arranged on a bridge abutment cover beam and below an H-shaped steel longitudinal beam. And the expansion joint steel plate is arranged on the bridge head expansion joint. And the sleeper beam is arranged at the tail part of the steel butt strap. The device can be disassembled, assembled and reused according to the displacement of the steel bridge, and the steel transition slab can rotate, so that the bridgehead roadbed is allowed to generate certain settlement. And when the settlement is too large, backfilling and filling treatment can be carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of open-pit mine bridges and culverts, and particularly relates to an assembled rotatable bridgehead steel slab under heavy load traffic in open-pit mines. Background Art

[0002] In the road and bridge transition section of open-pit mining areas, the settlement of bridge abutments is usually small, while the settlement of roadbeds is large, which is likely to cause height differences. Such uneven settlement differences will lead to different degrees of bridge abutment bumping. The bridgehead slab can effectively alleviate this difference, achieve a smooth transition effect, reduce the bumping of vehicles passing through the bridgehead, and at the same time, the slab can evenly transfer the load of open-pit trucks to the bridge abutment and embankment, reduce local stress, and extend the service life of the bridge.

[0003] At present, the design of highway bridgehead slabs under conventional highway loads generally uses reinforced concrete materials and is placed on the back wall or corbel of the bridge abutment. However, the load of open-pit mining trucks is much greater than that of conventional highway vehicles. It is difficult to control the construction quality of the bridgehead roadbed under the slab. Although special treatment is carried out for the filling of the bridgehead roadbed, it is still difficult to ensure no uneven settlement. Moreover, the slab is placed on the back wall or corbel of the bridge abutment, and under the action of the overweight axle load of mining trucks, it is extremely easy to cause damage to the slab, back wall or corbel. The natural environment of open-pit mines is relatively harsh, and concrete slabs are more prone to corrosion and aging. With the continuous advancement of open-pit mining, the transportation in open-pit mines changes frequently, and the bridge should meet the requirements of being movable and reusable. Traditional cast-in-place concrete slabs cannot meet the continuous moving requirements. Therefore, how to adapt to the inevitable settlement differences at the bridgehead and have a bridgehead slab that is not easily damaged and reusable is a problem that needs to be solved at present. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the invention is to provide an assembled rotatable bridgehead steel slab under heavy load traffic in open-pit mines, which can conform to the settlement of the bridgehead roadbed, has high strength, and is a movable bridgehead slab.

[0005] The technical solution adopted by the invention is: an assembled rotatable bridgehead steel slab under heavy load traffic in open-pit mines, the technical key points of which are as follows: it includes H-shaped steel longitudinal beams, diaphragms, anti-slip steel panels, pin shaft devices, TST elastomers, pillow beams and expansion joint steel plates. The H-shaped steel longitudinal beams are arranged at equal intervals along the transverse direction of the bridge, and the diaphragms are arranged along the longitudinal direction of the bridge and welded to the H-shaped steel longitudinal beams to form a support framework. The anti-slip steel panel is arranged on the support framework and connected to the framework as a whole; the main beam is rotatably connected to the H-shaped steel longitudinal beam through a pin shaft device; an expansion joint steel plate is installed on the bridgehead expansion joint formed by the main beam and the H-shaped steel longitudinal beam; the TST elastomer is arranged on the steel bridge abutment capping beam below the bridgehead expansion joint, and the H-shaped steel longitudinal beam is installed on the TST elastomer.

[0006] In the above solution, one side of the H-shaped steel longitudinal beam is arranged on the abutment capping beam, and the other side is arranged on the sleeper beam, and they are arranged at equal intervals transversely. Transverse stiffeners are provided at the web of the H-shaped steel longitudinal beam.

[0007] In the above solution, the anti-slip steel panel includes a steel plate and an anti-slip device integrally formed on the surface of the steel plate.

[0008] In the above solution, the pin shaft device includes a first ear plate and a second ear plate. The first ear plate is welded to the web of the main beam, and the second ear plate is connected to the web of the H-shaped steel longitudinal beam. A first pin shaft fixing nut with internal threads is arranged outside the first ear plate, and a second pin shaft fixing nut with internal threads is arranged outside the second ear plate. A pin shaft with external threads screws together the first pin shaft fixing nut, the first ear plate, the second ear plate and the second pin shaft fixing nut.

[0009] In the above solution, one end of the expansion joint steel plate is connected and welded to the steel box main beam of the steel bridge, and the other side is placed on the steel plate.

[0010] In the above solution, the TST elastomer is arranged at equal intervals on the abutment.

[0011] The beneficial effects of the present invention are as follows: The rotatable bridgehead steel slab applicable to heavy traffic in open-pit mines includes H-shaped steel longitudinal beams, which are arranged at equal intervals along the transverse bridge direction. The transverse diaphragms are arranged along the longitudinal bridge direction and welded to the H-shaped steel longitudinal beams to form a framework. The anti-slip steel panel is arranged on the framework and connected to the framework as a whole; the main beam and the H-shaped steel longitudinal beam are rotatably connected through a pin shaft device; an expansion joint steel plate is installed on the bridgehead expansion joint formed by the main beam and the H-shaped steel longitudinal beam; the TST elastomer is arranged on the steel bridge abutment capping beam below the bridgehead expansion joint, and the H-shaped steel longitudinal beam is installed on the TST elastomer. The present invention can be disassembled, installed and reused together with the relocation of the steel bridge. Since the steel slab can rotate, it allows a certain settlement of the bridgehead roadbed, and has a higher strength. When the settlement is too large, backfilling and heightening treatment can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the overall structure of the assembled rotatable bridgehead steel slab in the embodiment of the present application; Figure 2 It is the H-shaped steel longitudinal and cross beams of the assembled rotatable bridgehead steel slab in the embodiment of the present application; Figure 3It is the anti-slip steel panel of the prefabricated rotatable bridgehead steel slab in the embodiment of the present application; Figure 4 It is the connecting device of the prefabricated rotatable bridgehead steel slab in the embodiment of the present application; Figure 5 It is the TST elastoplastic body layout of the prefabricated rotatable bridgehead steel slab in the embodiment of the present application; Figure 6 It is the sleeper beam of the prefabricated rotatable bridgehead steel slab in the embodiment of the present application; Figure 7 It is the expansion joint steel plate of the prefabricated rotatable bridgehead steel slab in the embodiment of the present application; Figure 8 is Figure 3 partial enlarged view of; Explanation of reference numerals: 1 H-shaped steel longitudinal beam; 101 stiffening rib; 2 diaphragm plate; 3 anti-slip steel panel; 301 steel plate; 302 anti-slip device; 4 pin shaft device; 401 pin shaft fixing ear plate; 402 pin shaft; 403 pin shaft fixing nut; 5 TST elastoplastic body; 6 sleeper beam; 7 expansion joint steel plate; 8 steel bridge steel box main beam; 9 steel bridge abutment capping beam. Detailed implementation manners

[0014] To make the above objects, features and advantages of the present invention more obvious and understandable, the following combines the attached Figures 1-7 drawings and specific implementation manners to further elaborate the present invention in detail.

[0015] The rotatable bridgehead steel slab under heavy traffic in this embodiment includes H-shaped steel longitudinal beam 1, diaphragm plate 2, anti-slip steel panel 3, pin shaft connection 4, TST elastoplastic body 5, sleeper beam 6 and expansion joint steel plate 7. Among them, the H-shaped steel longitudinal beam 1 has two parallel flanges and a web connecting the two. The diaphragm plate 2 is a rectangular plate structure. The diaphragm plate 2 is welded to the web of the H-shaped steel longitudinal beam 1 and welded with the H-shaped steel longitudinal beam 1 to form an integral body, forming a stable connection. In this embodiment, multiple H-shaped steel longitudinal beams 1 are arranged longitudinally in parallel first to form the longitudinal support structure of the corrugated steel pipe tunnel. The diaphragm plates 2 are arranged transversely along the corrugated steel pipe tunnel and welded to the webs of the H-shaped steel longitudinal beams 1 at a certain interval. Multiple H-shaped steel longitudinal beams 1 and diaphragm plates 2 together constitute the support framework of the corrugated steel pipe tunnel.

[0016] The support frameworks are arranged on the steel bridge abutment capping beam 9 at equal intervals along the transverse direction of the bridge. A TST elastoplastic body 5 is placed between each H-shaped steel longitudinal beam 1 and the capping beam 9 for support. The anti-slip steel panel 3 is arranged on and welded to the whole of the H-shaped steel longitudinal beam 1 and the diaphragm plate 2 to form an integral body. A sleeper beam 6 is installed under the diaphragm plate 2 at the tail for support. The web of the H-shaped steel longitudinal beam 1 and the main beam 8 are connected by a pin shaft device 4 to achieve the purpose of rotation. An expansion steel plate 7 is arranged above the pin shaft device 4.

[0017] This embodiment is formed by welding and connecting the H-shaped steel longitudinal beam 1 and the diaphragm plate 2 to form the main structure of the rotatable rigid slab, and its size and quantity can be customized and adjusted according to the specific open-pit truck model and structural performance requirements. A plurality of stiffeners 101 are connected between the web and the flange of the H-shaped steel longitudinal beam 1.

[0018] The anti-slip steel panel 3 of this embodiment is arranged on the whole formed by the H-shaped steel longitudinal beam 1 and the diaphragm plate 2. The steel plate 301 is integrally formed with the H-shaped steel longitudinal beam 1 by welding. The anti-slip device 302 is integrally formed on the steel plate 301 at a certain interval. In this embodiment, it is a triangular anti-slip rib.

[0019] The pin connection 4 of this embodiment is as Figure 4 shown, and it is composed of two ear plates 401 in opposite directions, a pin 402 and a fixing nut 403. One ear plate 401 is welded to the web of the steel main beam 8, and the other ear plate is welded to the web of the H-shaped steel longitudinal beam 1. Along the transverse bridge direction, the two ear plates 401 on the webs of each H-shaped steel longitudinal beam 1 and the main beam 8 are screwed together through the fixing nut 403 and the pin 402. When inevitable slight settlement occurs in the bridgehead roadbed, the bridgehead slab can rotate within a small range along the pin 402 to achieve the purpose of adapting to the settlement.

[0020] The TST elastomer 5 of this embodiment is as Figure 5 shown, and it is arranged on the steel capping beam 9 and is used to support the steel slab. The TST elastomer 5 itself can produce small-range elastoplastic deformation to adapt to the rotation of the steel slab.

[0021] The bolster 6 of this embodiment is made of concrete material and is arranged under the diaphragm plate 2 at the tail end.

[0022] The expansion joint steel plate 7 of this embodiment is arranged on the steel box main beam 8 of the steel bridge and the steel plate 301. One side is welded to the steel box main beam 8 of the steel bridge, and the other side is placed on the steel plate 301 and is not welded to the slab.

[0023] The principle of the rotatable bridgehead steel slab under heavy traffic in this embodiment is as follows: The steel slab skeleton composed of the H-shaped steel longitudinal beam 1 and the diaphragm plate 2 has the advantages of high load-bearing capacity and light self-weight. When inevitable slight settlement occurs in the bridgehead roadbed, the bridgehead slab can rotate within a small range along the pin 402 to achieve the purpose of adapting to the settlement. When the settlement of the bridgehead roadbed is too large, the slab can be rotated upward or disassembled, and after the roadbed is backfilled and compacted under the slab, the steel slab is restored to its original state. When the steel box main beam 8 of the steel bridge needs to be relocated, the connecting parts such as the pins 4 are disassembled, and all the components of the steel slab are moved to the new bridge position for reinstallation and use.

[0024] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines, characterized in that, It includes H-shaped steel longitudinal beams, diaphragms, anti-slip steel plates, pin shaft devices, TST elastoplastic bodies, cross beams and expansion joint steel plates. The H-shaped steel longitudinal beams are arranged at equal intervals along the transverse direction of the bridge. The diaphragms are arranged along the longitudinal direction of the bridge and welded to the H-shaped steel longitudinal beams to form a support frame. The anti-slip steel plates are arranged on the support frame and connected to the frame as a whole. The main beam is rotatably connected to the H-shaped steel longitudinal beam through a pin shaft device. An expansion joint steel plate is installed on the bridge head expansion joint formed by the main beam and the H-shaped steel longitudinal beam. The TST elastoplastic body is arranged on the steel bridge abutment capping beam below the bridge head expansion joint, and the H-shaped steel longitudinal beam is installed on the TST elastoplastic body.

2. The rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines according to claim 1, characterized in that, One side of the H-shaped steel longitudinal beam is arranged on the abutment capping beam, and the other side is arranged on the cross beam, and they are arranged at equal intervals transversely. Transverse stiffeners are provided at the webs of the H-shaped steel longitudinal beams.

3. The rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines as claimed in claim 1, wherein The anti-slip steel plate includes a steel plate and an anti-slip device integrally formed on the surface of the steel plate.

4. A rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines as described in claim 1, characterized in that, The pin shaft device includes a first ear plate and a second ear plate. The first ear plate is welded to the web of the main beam, and the second ear plate is connected to the web of the H-shaped steel longitudinal beam. A first pin shaft fixing nut with internal threads is arranged outside the first ear plate, and a second pin shaft fixing nut with internal threads is arranged outside the second ear plate. A pin shaft with external threads screws together the first pin shaft fixing nut, the first ear plate, the second ear plate and the second pin shaft fixing nut.

5. The rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines as claimed in claim 1, wherein One end of the expansion joint steel plate is connected to the steel box main beam of the steel bridge by welding, and the other side is placed on the steel plate.

6. The rotatable bridgehead steel slab applicable to heavy-duty traffic in open-pit mines according to claim 1, wherein The TST elastoplastic bodies are arranged on the bridge abutment at equal intervals.

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