Middle section steel-UHPC (Ultra High Performance Concrete) combined bridge deck for prefabricated long-span bridge

Abstract

The invention relates to the technical field of bridges, in particular to a prefabricated long-span bridge middle section steel-UHPC combined bridge floor which comprises a UHPC bridge floor and middle section steel arranged on the bottom face of the UHPC bridge floor. A reinforcing mesh structure formed by arranging a plurality of reinforcing steel bar units in a transverse and longitudinal crossing manner is arranged in the UHPC bridge floor, and the reinforcing mesh structure is provided with a plurality of crossing nodes; wherein one part of the cross nodes are bundled and fixed through metal wires, and the other part of the cross nodes are bundled and fixed through reinforcing pieces; part of the cross nodes of the reinforcing mesh structure in the UHPC bridge floor are bound and fixed through the metal wires, the other part of the cross nodes are bound and fixed through the reinforcers, and the binding positions of the reinforcers can be placed on some key cross nodes, so that the binding strength of the cross nodes of the part is guaranteed, and the service life of the reinforcing mesh structure is prolonged. Therefore, the overall strength of the reinforcing mesh structure after pouring is guaranteed, and the structural safety and stability of the bridge are improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to a medium-shaped steel-UHPC composite bridge deck of a prefabricated large-span bridge. Background Art

[0002] Each cross node of the existing steel mesh is tied with iron wire. First, in order to facilitate bundling, the iron wire is often small in diameter and easily corroded and broken in the alkaline environment of concrete, resulting in failure of the bundling effect of the cross node, thereby affecting the overall strength of the steel mesh; secondly, due to the small diameter of the iron wire, the bundling strength of the iron wire is limited. When the local deformation of the steel bar is serious, the limited binding force cannot overcome the binding of the cross node between the two steel bars, forming a weak point in strength in the steel mesh, affecting the overall strength of the steel mesh. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned disadvantages and provide a prefabricated large-span bridge medium-section steel-UHPC composite bridge deck.

[0004] To achieve the above object, the specific scheme of the present invention is as follows:

[0005] A prefabricated large-span bridge medium-section steel-UHPC composite bridge deck comprises a UHPC bridge deck and medium-section steel arranged on the bottom surface of the UHPC bridge deck; a steel mesh structure composed of a plurality of steel bar units arranged crosswise in the horizontal and vertical directions is arranged in the UHPC bridge deck, and the steel mesh structure has a plurality of cross nodes; wherein a part of the cross nodes are fixed by binding with metal wires, and another part of the cross nodes are fixed by binding with reinforcement members.

[0006] The present invention further comprises a mounting seat, a rotating seat rotatably arranged on the top surface of the mounting seat, a first positioning seat and a second positioning seat relatively arranged on the bottom surface of the mounting seat, and two movable seats relatively movably arranged on the bottom surface of the mounting seat; the reinforcement also comprises a first clamping ring and a second clamping ring;

[0007] The centers of the mounting seat and the rotating seat are both provided with a center hole; the hole wall of the center hole of the rotating seat is provided with a first driving groove; the rotating seat is provided with two second driving grooves; the tops of the two movable seats are both provided with a pin shaft that movably penetrates the mounting seat and then is embedded in the corresponding second driving groove; the rotating seat is elastically provided with a limit pin;

[0008] The two ends of the first clamping ring are respectively slidably arranged on the first positioning seat and the second positioning seat; a bayonet is provided at the top of the first clamping ring for cooperating with the first driving groove to drive the rotating seat to rotate; one end of the second clamping ring is hinged to one end of the first clamping ring; the other end of the second clamping ring is coupled to the other end of the first clamping ring.

[0009] The present invention further comprises a straight section and a spiral section connected in sequence; an opening is provided at the lower end of the straight section for the bayonet to enter the straight section; the second driving groove is a planar spiral groove; the distance between the first end of the planar spiral groove and the center of the rotating seat is smaller than the distance between the second end of the planar spiral groove and the center of the rotating seat; the rotating seat is provided with a first accommodating groove at a position corresponding to the first end of the planar spiral groove; a first spring is provided in the first accommodating groove; one end of the limit pin movably extends into the first accommodating groove and abuts against the first spring; the other end of the limit pin is provided with an inclined surface; the other end of the limit pin extends into the planar spiral groove under the elastic force of the first spring.

[0010] The present invention further comprises: a first rotating shaft is provided at one end of the first clamping ring; a gear structure is provided at one end of the first rotating shaft; the first positioning seat is provided with a spur rack meshing with the gear structure; a second rotating shaft is sleeved on the other end of the first rotating shaft; one end of the second clamping ring is rotatably sleeved on the second rotating shaft; a friction sleeve is provided between the outer peripheral wall of the second rotating shaft and the second clamping ring.

[0011] Furthermore, in the present invention, a first locking pin is elastically provided at one end of the first rotating shaft; and the first positioning seat is provided with a first locking hole for lockingly cooperating with the first locking pin.

[0012] The present invention further provides that the other end of the first clamping ring is provided with a U-shaped portion; an arc-shaped rack is movably provided inside the U-shaped portion; and the other end of the second clamping ring is provided with an arc-shaped tooth portion for unidirectional engagement with the arc-shaped rack.

[0013] The present invention further comprises: an inner wall of the U-shaped portion is provided with a slide groove extending along the radial direction of the first clamping ring; the depth of the slide groove gradually decreases from the inside to the outside along the radial direction of the first clamping ring; the arc-shaped rack is provided with a second accommodating groove; a second spring and a driving pin are provided in the second accommodating groove; one end of the driving pin abuts against the second spring; the other end of the driving pin is movably embedded in the slide groove under the elastic force of the second spring.

[0014] In the present invention, a plurality of slide grooves are provided at intervals on the inner side wall of the U-shaped portion; and the arc-shaped rack is provided with driving pins corresponding to the plurality of slide grooves one by one.

[0015] In the present invention, a second locking pin is elastically provided at the other end of the first clamping ring; and a second locking hole for lockingly cooperating with the second locking pin is provided at the second positioning seat.

[0016] According to the present invention, a first rubber strip is provided on the inner circumferential wall of the first clamping ring; and a second rubber strip is provided on the inner circumferential wall of the second clamping ring.

[0017] The beneficial effects of the present invention are as follows: during the manufacture of the present invention, some cross nodes of the steel mesh structure in the UHPC bridge deck are tied and fixed with metal wires, while other cross nodes are tied and fixed with reinforcements, and the tying positions of the reinforcements can be placed on some key cross nodes, thereby ensuring the tying strength of the cross nodes, thereby facilitating the overall strength of the steel mesh structure after casting, and facilitating improving the structural safety and stability of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded schematic diagram of a medium-shaped steel-UHPC composite bridge deck of a prefabricated large-span bridge of the present invention;

[0019] Figure 2 It is a cross-sectional schematic diagram of a medium-shaped steel-UHPC composite bridge deck of a prefabricated large-span bridge of the present invention;

[0020] Figure 3 is a schematic structural diagram of a reinforcement member of the present invention;

[0021] Figure 4 is an exploded schematic diagram of a reinforcement member of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure after the reinforcing member of the present invention holds the cross node tightly;

[0023] Figure 6 It is a cross-sectional schematic diagram of the reinforcing member of the present invention after embracing the cross node;

[0024] Figure 7 yes Figure 6 A local enlarged schematic diagram of the middle A;

[0025] Figure 8 It is a structural schematic diagram of the rotating seat of the present invention;

[0026] Fig. 9 It is a schematic diagram of the structure when the first clamping ring and the second clamping ring of the present invention cooperate with each other;

[0027] Fig.10 It is a structural schematic diagram of another viewing angle when the first clamping ring and the second clamping ring of the present invention cooperate with each other;

[0028] Fig.11 is a cross-sectional view of the first clamping ring and the second clamping ring of the present invention when they are matched;

[0029] Fig.12 It is a cross-sectional schematic diagram of the first clamping ring and the second clamping ring of the present invention when they are matched;

[0030] Description of reference numerals: 1. UHPC bridge deck; 2. Medium steel; 3. Steel mesh structure; 31. Cross node; 4. Reinforcement member; 41. Mounting seat; 42. Rotating seat; 421. Straight segment; 422. Spiral segment; 423. Planar spiral groove; 424. Limit pin; 4241. Inclined surface; 425. First spring; 431. First positioning seat; 432. Second positioning seat; 44. Movable seat; 441. Pin shaft; 451. First clamping ring ; 4511, U-shaped portion; 4512, latch; 4513, slide groove; 4514, second locking pin; 4515, first rubber strip; 452, second clamping ring; 4521, arc-shaped tooth portion; 4522, friction sleeve; 4523, second rubber strip; 46, first rotating shaft; 461, gear structure; 462, first locking pin; 47, spur rack; 48, second rotating shaft; 49, arc-shaped rack; 491, second spring; 492, driving pin. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0032] like Figures 1 to 12 As shown, a prefabricated large-span bridge medium steel 2-UHPC composite bridge deck described in this embodiment includes a UHPC bridge deck 1 and a medium steel 2 installed on the bottom surface of the UHPC bridge deck 1; there are multiple medium steels 2, and the multiple medium steels 2 are arranged in sequence along the width of the UHPC bridge deck 1; a steel mesh structure 3 composed of a number of steel bar units arranged crosswise in the horizontal and vertical directions is arranged in the UHPC bridge deck 1, and the steel mesh structure 3 has multiple cross nodes 31; wherein, a part of the cross nodes 31 is tied and fixed by metal wires (not shown in the figure), preferably, the metal wires are iron wires, which are low in cost; another part of the cross nodes 31 is tied and fixed by reinforcing members 4. The number of reinforcing members 4 can be freely set according to actual needs; the reinforcing members 4 can preferably be made of high temperature resistant and corrosion resistant materials, such as stainless steel materials.

[0033] When manufacturing the medium-section steel 2-UHPC composite bridge deck of the prefabricated large-span bridge of this embodiment, some of the cross nodes 31 of the steel mesh structure 3 in the UHPC bridge deck 1 are fixed by binding with metal wires, while the other cross nodes 31 are fixed by binding with reinforcement members 4. The binding positions of the reinforcement members 4 can be placed on some key cross nodes 31, thereby ensuring the binding strength of the cross nodes 31, which is beneficial to ensuring the overall strength of the steel mesh structure 3 after casting and improving the structural safety and stability of the bridge.

[0034] like Figures 2 to 12As shown, in the prefabricated large-span bridge medium-section steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, the reinforcement 4 includes a mounting seat 41, a rotating seat 42 rotatably arranged on the top surface of the mounting seat 41, a first positioning seat 431 and a second positioning seat 432 relatively arranged on the bottom surface of the mounting seat 41, and two movable seats 44 relatively movably arranged on the bottom surface of the mounting seat 41; the reinforcement 4 also includes a first clamping ring 451 and a second clamping ring 452.

[0035] Specifically, Figure 4 As shown, the mounting seat 41 is circular, and the mounting seat 41 includes a first annular body and a second annular body arranged coaxially; four first reinforcing ribs are connected between the first annular body and the second annular body; the four first reinforcing ribs are distributed in a cross shape, and the first annular body, the second annular body and the four first reinforcing ribs are integrally formed, and the structural strength is stronger.

[0036] like Figures 3 to 6 , Figure 8 As shown, the rotating seat 42 is circular, and its diameter is equal to that of the mounting seat 41, and includes a third annular body and a fourth annular body arranged coaxially; the third annular body, the fourth annular body, the first annular body and the second annular body are arranged coaxially; four second reinforcing ribs are connected between the third annular body and the fourth annular body; the four second reinforcing ribs are distributed in a cross shape, and the third annular body, the fourth annular body and the four second reinforcing ribs are integrally formed, and the structural strength is stronger.

[0037] like Figure 4 As shown, the first clamping ring 451 and the second clamping ring 452 are both roughly semi-ring structures, and the steel bars of the intersection node 31 are tied and fixed by the first clamping ring 451 and the second clamping ring 452.

[0038] like Figure 3 and Figure 4 As shown, the first positioning seat 431 and the second positioning seat 432 are both roughly in an inverted U-shaped structure; the first positioning seat 431, the second positioning seat 432, and the two movable seats 44 are distributed in a cross shape.

[0039] like Figure 4 and Figure 6 As shown, the second annular body of the mounting seat 41 constitutes a first center hole, and the fourth third annular body of the rotating seat 42 constitutes a second center hole; Figure 8 As shown, the hole wall of the second center hole of the rotating seat 42 is provided with a first driving groove; the first driving groove includes a straight section 421 and a spiral section 422 connected in sequence; the lower end of the straight section 421 is provided with an opening for the bayonet 4512 to enter the straight section 421;

[0040] like Figure 8As shown, two second driving grooves are provided on the bottom surface of the third annular body of the rotating seat 42; the second driving groove is a planar spiral groove 423; the distance between the first end of the planar spiral groove 423 and the center of the rotating seat 42 is smaller than the distance between the second end of the planar spiral groove 423 and the center of the rotating seat 42.

[0041] like Figure 4 , Figure 6 and Figure 7 As shown, the tops of the two movable seats 44 are each provided with a pin shaft 441 which movably penetrates the mounting seat 41 , and the pin shaft 441 is movably embedded in the corresponding second driving groove.

[0042] like Figure 6 and Figure 7 As shown, the rotating seat 42 is elastically provided with a stop pin 424. Specifically, the rotating seat 42 is provided with a first receiving groove at a position corresponding to the first end of the planar spiral groove 423; a first spring 425 is provided in the first receiving groove; one end of the stop pin 424 movably extends into the first receiving groove and abuts against the first spring 425; the other end of the stop pin 424 is provided with an inclined surface 4241; the other end of the stop pin 424 extends into the planar spiral groove 423 under the elastic force of the first spring 425.

[0043] like Figures 3 to 7 , Figures 9 to 12 As shown, the two ends of the first clamping ring 451 are respectively slidably arranged on the first positioning seat 431 and the second positioning seat 432; the top of the first clamping ring 451 is provided with a bayonet 4512 for cooperating with the first driving groove to drive the rotating seat 42 to rotate. Specifically, a connecting seat is fixed to the top of the first clamping ring 451, and the bayonet 4512 is arranged on the connecting seat, and the bayonet 4512 and the connecting seat are integrally formed; one end of the first clamping ring 451 is provided with a first rotating shaft 46; one end of the first rotating shaft 46 is provided with a gear structure 461; the first positioning seat 431 is provided with a spur rack meshing with the gear structure 461; the other end of the first rotating shaft 46 is sleeved with a second rotating shaft; the second rotating shaft and the first rotating shaft 46 can be matched by a profile sleeve method to limit the relative rotational movement between the two. Furthermore, both the first positioning seat 431 and the second positioning seat 432 are provided with an avoidance groove, which extends in a long strip shape along the vertical direction, and a spur rack is provided on the groove wall of the avoidance groove, and the gear structure 461 is located in the avoidance groove.

[0044] like Figures 9 to 12As shown, the other end of the first clamping ring 451 is provided with a U-shaped portion 4511; an arc-shaped rack is movably provided in the U-shaped portion 4511; the other end of the second clamping ring 452 is provided with an arc-shaped tooth portion 4521 for unidirectional meshing with the arc-shaped rack. The inner side wall of the U-shaped portion 4511 is provided with a slide groove 4513 extending along the radial direction of the first clamping ring 451; the depth of the slide groove 4513 gradually decreases from the inside to the outside along the radial direction of the first clamping ring 451; the arc-shaped rack is provided with a second accommodating groove; a second spring and a driving pin are provided in the second accommodating groove; one end of the driving pin abuts against the second spring; the other end of the driving pin is movably embedded in the slide groove 4513 under the elastic force of the second spring.

[0045] like Figures 9 to 12 As shown, one end of the second clamping ring 452 is hinged to one end of the first clamping ring 451; the other end of the second clamping ring 452 is coupled to the other end of the first clamping ring 451. Specifically, one end of the second clamping ring 452 is rotatably sleeved on the second rotating shaft; a friction sleeve 4522 is provided between the outer peripheral wall of the second rotating shaft and the second clamping ring 452.

[0046] Specifically, when manufacturing the medium-sized steel 2-UHPC composite bridge deck of the prefabricated large-span bridge of this embodiment, the reinforcement 4 is placed downward from the top of the intersection node 31 of the two steel bars. During the downward process, since the arc-shaped tooth portion 4521 and the arc-shaped rack are in one-way meshing, the second clamping ring 452 is squeezed by the steel bar and rotates counterclockwise with the second rotation axis as the fulcrum, and the arc-shaped tooth portion 4521 and the arc-shaped rack gradually disengage, that is, relative movement is generated between the arc-shaped tooth portion 4521 and the arc-shaped rack, so that the intersection node 31 of the two steel bars enters the first clamping ring 451. In this process, the arc-shaped rack is repeatedly squeezed by the arc-shaped tooth portion 4521, as well as the drive pin, the second spring and the slide groove 4513. The second clamping ring 4521 is pressed against the reinforcing bar 4521 and the second clamping ring 4522 is pressed against the reinforcing bar 4523. The second clamping ring 4521 is pressed against the reinforcing bar 4523 and the second clamping ring 4522 is pressed against the reinforcing bar 4523. The second clamping ring 4521 is pressed against the reinforcing bar 4523 and the second clamping ring 4522 is pressed against the reinforcing bar 4523.

[0047] Then, the reinforcing member 4 is pressed downward. At this time, the first clamping ring 451 cannot move downward with the first positioning seat 431 and the second positioning seat 432 due to the obstruction of the cross node 31, so that the first clamping ring 451 drives the first rotating shaft 46 to move upward relative to the first positioning seat 431 and the second positioning seat 432. When the gear structure 461 of the first rotating shaft 46 is meshed with the spur rack on the first positioning seat 431, the spur rack drives the first rotating shaft 46 to rotate through the gear structure 461. When the first rotating shaft 46 rotates, it drives the second rotating shaft to rotate. The second rotating shaft drives the second clamping ring 452 to rotate counterclockwise through the friction sleeve 4522, thereby further clamping the cross node 31, thereby providing a greater clamping force; the first clamping ring 451 drives the bayonet 4512 to enter the straight section 421 through the opening, and as the first clamping ring 451 moves further upward relatively, the bayonet 4512 enters the spiral section 422 from the straight section 421. At this time, the bayonet 45 The first locking ring 451 drives the rotating seat 42 to rotate, and the rotating seat 42 cooperates with the pin 441 through the plane spiral groove 423 to drive the two movable seats 44 to move toward the center of the mounting seat 41. The pin 441 moves along the trajectory of the plane spiral groove 423 until the pin 441 contacts the inclined surface 4241 of the limiting pin 424, and the pin 441 squeezes the limiting pin 424 to retract, so that the first spring 425 is compressed until the limiting pin 424 passes over the pin 441. The limiting pin 424 extends into the plane spiral groove 423 again under the elastic force of the first spring 425. At this time, the locking pin 4512 abuts against the end position of the spiral segment 422 to limit the rotating seat 42 from continuing to rotate. At the same time, the limiting pin 424 abuts against the pin 441 to limit the rotating seat 42 from rotating in the opposite direction, thereby locking the rotating seat 42, so that the two movable seats 44 maintain the state of holding the cross node 31 tightly, as shown in FIG. Figure 1 As shown;

[0048] If during the upward movement, the second clamping ring 452 has been completely tightened, as the first clamping ring 451 moves further upward relatively, the first rotating shaft 46 drives the second rotating shaft to rotate, and the second rotating shaft drives the friction sleeve 4522 to rotate idly, thereby ensuring that the pin 4512 can fully cooperate with the spiral section 422 to achieve the locking of the rotating seat 42; in this way, the cross node 31 is tightened and the tightening force is enhanced.

[0049] Through the above arrangement, the embodiment of the present invention can achieve the bundling effect of the reinforcement member 4 by simply pressing the reinforcement member 4 during installation, realize efficient bundling of the reinforcement member 4, and provide sufficient clamping force for the steel bars, improve construction efficiency, and help ensure that the steel bars can be firmly fixed throughout the entire construction process and the service life of the bridge, and help ensure the overall strength of the steel mesh structure 3, further improving the structural safety and stability of the bridge. Compared with the method of bundling with iron wire, the reinforcement member 4 of the embodiment of the present invention is more corrosion-resistant and has stronger strength.

[0050] As 3 to Figure 6 , Fig. 9 , Fig.10 and Fig.12 As shown, in the prefabricated large-span bridge medium-shaped steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, a first locking pin 462 is elastically provided at one end of the first rotating shaft 46; the first positioning seat 431 is provided with a first locking hole for locking with the first locking pin 462. Specifically, the first locking pin 462 is coaxially arranged with the first rotating shaft 46, and a first return spring is connected between the two; the first locking pin 462 extends into the avoidance groove of the first positioning seat 431 under the elastic force of the first return spring, and abuts against the groove wall of the avoidance groove; the first locking hole is arranged at the upper end of the avoidance groove. In this embodiment, the first locking pin 462 and the first locking hole are provided so that when the locking pin 4512 abuts against the end point of the spiral segment 422, the first locking pin 462 moves up to a position corresponding to the first locking hole, and the first locking pin 462 is elastically inserted into the first locking hole, thereby locking the first clamping ring 451, so that the first clamping ring 451 and the first positioning seat 431 are combined into a whole, thereby further enhancing the clamping force of the first clamping ring 451, the second clamping ring 452 and the two movable seats 44 on the cross node 31.

[0051] like Fig.11 and Fig.12 As shown, in the prefabricated large-span bridge medium steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, the inner wall of the U-shaped portion 4511 is provided with a plurality of slide grooves 4513 at intervals; the arc-shaped rack is provided with driving pins corresponding to the plurality of slide grooves 4513 one by one. Specifically, the plurality of driving pins are distributed at intervals along the arc length direction of the arc-shaped rack. In this embodiment, by providing a plurality of driving pins to cooperate with the slide grooves 4513, the arc-shaped rack is subjected to a more balanced force, so as to ensure that the arc-shaped rack can still reliably unidirectionally mesh with the arc-shaped tooth portion 4521 during movement.

[0052] In the prefabricated large-span bridge medium steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, the driving pin is made of an expansion material. The expansion material can be a shape memory polymer, a thermal expansion polymer composite material, an alloy with a high expansion coefficient, or a ceramic matrix composite material. When the reinforcement 4 is bundled and cast, the driving pin can expand due to heat, so that the driving pin remains against the deepest part of the slide groove 4513, thereby enhancing the locking force between the arc-shaped tooth portion 4521 and the arc-shaped rack, thereby improving the structural stability of the composite bridge deck.

[0053] As 3 to Figure 6 , Fig. 9 and Fig.10As shown, in the prefabricated large-span bridge medium steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, the other end of the first clamping ring 451 is elastically provided with a second locking pin 4514; the second positioning seat 432 is provided with a second locking hole for locking with the second locking pin 4514. Specifically, the second locking pin 4514 is coaxially arranged with the second rotating shaft, and a second return spring is connected between the two; the second locking pin 4514 extends into the avoidance groove of the second positioning seat 432 under the action of the second return spring, and abuts against the groove wall of the avoidance groove; the second locking hole is arranged at the upper end of the avoidance groove. In this embodiment, a second locking pin 4514 and a second locking hole are provided so that when the locking pin 4512 abuts against the end point of the spiral segment 422, the second locking pin 4514 moves up to a position corresponding to the second locking hole, and the second locking pin 4514 is elastically inserted into the second locking hole, thereby locking the first clamping ring 451, so that the first clamping ring 451 and the second positioning seat 432 are combined into a whole, thereby further enhancing the clamping force of the first clamping ring 451, the second clamping ring 452 and the two movable seats 44 on the cross node 31.

[0054] like Fig. 9 As shown, in the prefabricated large-span bridge medium steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, the inner circumferential wall of the first clamping ring 451 is provided with a first rubber strip 4515; the inner circumferential wall of the second clamping ring 452 is provided with a second rubber strip 4523. In this embodiment, by providing the first rubber strip 4515 and the second rubber strip 4523, the friction between the first clamping ring 451, the second clamping ring 452 and the steel bar is increased, and the clamping strength of the first clamping ring 451, the second clamping ring 452 to the cross node 31 is further enhanced, which is conducive to improving the overall strength of the steel mesh structure 3.

[0055] like Figure 7 As shown, in the prefabricated large-span bridge medium-type steel 2-UHPC composite bridge deck of this embodiment, in some embodiments, a limiting notch is recessed on the side wall of the pin shaft 441. In this way, when the latch 4512 abuts against the end position of the spiral section 422, the limiting pin 424 passes over the pin shaft 441, and the limiting pin 424 extends into the plane spiral groove 423 again under the elastic force of the first spring 425 and is embedded in the limiting notch, thereby enhancing the cooperation between the pin shaft 441 and the limiting pin 424 to ensure the restriction of the rotating seat 42.

[0056] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A prefabricated long-span bridge medium-steel-UHPC composite bridge deck, characterized in that: The invention comprises a UHPC bridge deck and medium-shaped steel arranged on the bottom surface of the UHPC bridge deck; a steel mesh structure composed of a plurality of steel bar units arranged crosswise in horizontal and vertical directions is arranged in the UHPC bridge deck, and the steel mesh structure has a plurality of cross nodes; a part of the cross nodes are fixed by binding with metal wires, and another part of the cross nodes are fixed by binding with reinforcement members.

2. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 1, characterized in that: The reinforcement member includes a mounting seat, a rotating seat rotatably arranged on the top surface of the mounting seat, a first positioning seat and a second positioning seat relatively arranged on the bottom surface of the mounting seat, and two movable seats relatively movably arranged on the bottom surface of the mounting seat; the reinforcement member also includes a first clamping ring and a second clamping ring; The centers of the mounting seat and the rotating seat are both provided with a center hole; the hole wall of the center hole of the rotating seat is provided with a first driving groove; the rotating seat is provided with two second driving grooves; the tops of the two movable seats are both provided with a pin shaft that movably penetrates the mounting seat and then is embedded in the corresponding second driving groove; the rotating seat is elastically provided with a limit pin; The two ends of the first clamping ring are respectively slidably arranged on the first positioning seat and the second positioning seat; a bayonet is provided at the top of the first clamping ring for cooperating with the first driving groove to drive the rotating seat to rotate; one end of the second clamping ring is hinged to one end of the first clamping ring; the other end of the second clamping ring is coupled to the other end of the first clamping ring.

3. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 2, characterized in that: The first driving groove includes a straight section and a spiral section connected in sequence; the lower end of the straight section is provided with an opening for the latch to enter the straight section; the second driving groove is a planar spiral groove; the distance between the first end of the planar spiral groove and the center of the rotating seat is smaller than the distance between the second end of the planar spiral groove and the center of the rotating seat; the rotating seat is provided with a first accommodating groove at a position corresponding to the first end of the planar spiral groove; a first spring is provided in the first accommodating groove; one end of the limit pin movably extends into the first accommodating groove and abuts against the first spring; the other end of the limit pin is provided with an inclined surface; the other end of the limit pin extends into the planar spiral groove under the elastic force of the first spring.

4. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 2, characterized in that: A first rotating shaft is provided at one end of the first clamping ring; a gear structure is provided at one end of the first rotating shaft; the first positioning seat is provided with a spur rack meshing with the gear structure; a second rotating shaft is sleeved on the other end of the first rotating shaft; one end of the second clamping ring is rotatably sleeved on the second rotating shaft; a friction sleeve is provided between the outer peripheral wall of the second rotating shaft and the second clamping ring.

5. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 4, characterized in that: A first locking pin is elastically provided at one end of the first rotating shaft; and a first locking hole for lockingly cooperating with the first locking pin is provided at the first positioning seat.

6. The medium-shaped steel-UHPC composite bridge deck of a prefabricated long-span bridge according to claim 4, characterized in that: The other end of the first clamping ring is provided with a U-shaped portion; an arc-shaped rack is movably provided inside the U-shaped portion; and the other end of the second clamping ring is provided with an arc-shaped tooth portion for unidirectional meshing with the arc-shaped rack.

7. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 6, characterized in that: The inner wall of the U-shaped portion is provided with a sliding groove extending along the radial direction of the first clamping ring; the depth of the sliding groove gradually decreases from the inside to the outside along the radial direction of the first clamping ring; the arc-shaped rack is provided with a second accommodating groove; a second spring and a driving pin are arranged in the second accommodating groove; one end of the driving pin abuts against the second spring; the other end of the driving pin is movably embedded in the sliding groove under the elastic force of the second spring.

8. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 7, characterized in that: The inner side wall of the U-shaped portion is provided with a plurality of slide grooves at intervals; the arc-shaped rack is provided with driving pins corresponding to the plurality of slide grooves one by one.

9. The prefabricated long-span bridge medium steel-UHPC composite bridge deck according to claim 2, characterized in that: The other end of the first clamping ring is elastically provided with a second locking pin; the second positioning seat is provided with a second locking hole for locking cooperation with the second locking pin.

10. The medium-shaped steel-UHPC composite bridge deck of a prefabricated long-span bridge according to claim 2, characterized in that: The inner circumferential wall of the first clamping ring is provided with a first rubber strip; the inner circumferential wall of the second clamping ring is provided with a second rubber strip.

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