CN211735010U - A prefabricated soil-covered corrugated steel plate-prestressed concrete composite arch bridge - Google Patents

Abstract

The utility model discloses an assembled earthing corrugated steel board-prestressed concrete combination arched bridge. The combined arch bridge consists of an arch abutment broken stone cushion layer, arch abutments, stiffening corrugated steel plate-prestressed concrete combined arch rings between the arch abutments, stiffening corrugated steel plate end walls on the two transverse sides of the combined arch rings, anchor cables, railings, the combined arch rings, compacted sand surrounded by the end walls and a bridge floor structure layer. The combined arch ring comprises a corrugated steel plate, a precast concrete plate, transverse and longitudinal joints, double rows of elongated threaded studs and prestressed steel bars at the transverse joints. The end wall comprises a corrugated steel plate and a bidirectional channel steel stiffening beam on the surface of the end wall. The end wall and the combined arch ring are connected by adopting angle steel and reinforced by a concrete lining-group nail structure at the end part of the transverse joint. The combined arch ring greatly improves the rigidity, the anti-seismic and anti-buckling capacity and the durability of the arch ring; the end wall provided with the anchor cable not only reduces the dead load, but also enhances the self rigidity and the anti-buckling capacity, and obviously reduces the stress of the combined arch ring and the joint of the combined arch ring and the end wall.

Description

A prefabricated soil-covered corrugated steel plate-prestressed concrete composite arch bridge

technical field

The utility model relates to the technical field of bridge engineering and composite structures, in particular to an assembled soil-covered corrugated steel plate-prestressed concrete composite arch bridge.

Background technique

At present, the medium and small bridges and culverts in our country generally adopt the traditional reinforced concrete or masonry structure, and a few adopt the corrugated steel plate structure covered with soil. Reinforced concrete or masonry structures have a long construction period, poor adaptability to foundation deformation, and weak seismic performance. Problems such as cracking, spalling, water seepage, and steel corrosion are very likely to occur during the use stage, which requires a lot of manpower and costs to repair. Compared with reinforced concrete and masonry structures, due to the synergistic effect of soil-structure and flexible corrugated steel plate, the corrugated steel plate arch bridge covered with soil has the advantages of strong deformation adaptability and low engineering cost, but also has the advantages of spanning ability, seismic resistance and buckling resistance. Strong and other defects. The introduction of corrugated steel plate-concrete composite structure can make up for the above defects, but the workload of on-site concrete pouring and stud welding is very large, which not only significantly prolongs the construction period, but also makes it difficult to ensure the construction quality. In addition, the end walls on both sides above the arch ring of the corrugated steel plate arch bridge covered with soil are generally made of concrete walls, which require a larger section size to resist the internal force caused by the earth pressure, resulting in excessive self-weight of the end wall, increasing the burden on the arch ring and further increasing the cost. . Therefore, it is urgent to propose a corrugated steel plate arch bridge covered with soil with large spanning capacity, strong seismic and buckling resistance, and quick and easy construction.

Utility model content

The purpose of this utility model is to solve the problems of insufficient spanning capacity, weak anti-seismic capacity, weak anti-buckling performance, large workload of on-site stud welding and concrete pouring, long construction period, etc. Soil-covered corrugated steel plate-prestressed concrete composite arch bridge. The above problems of the existing corrugated steel plate bridge covered with soil can be overcome by strengthening the arch ring structure, improving the end wall structure and increasing the proportion of prefabricated components.

The purpose of the utility model is achieved through the following technical solutions: an assembled soil-covered corrugated steel plate-prestressed concrete composite arch bridge, comprising an arch seat gravel cushion, an arch seat, a stiffened corrugated steel plate-prestressed concrete composite arch ring, a stiffened corrugated steel plate end walls, anchor cables, railings, compacted sand, gravel fill and bridge deck structures;

The arch seat is set on the crushed stone cushion of the arch seat, the stiffened corrugated steel plate-prestressed concrete composite arch ring is fixed between the two arch seats, and the stiffened corrugated steel plate end wall is installed on the transverse two sides of the stiffened corrugated steel plate-prestressed concrete composite arch ring. The end walls of stiffened corrugated steel plates on both sides are connected by anchor cables, and the compacted sand is filled in layers in the space surrounded by the stiffened corrugated steel plate-prestressed concrete composite arch and the end walls of stiffened corrugated steel plates. An arch bridge structure is formed by laying a gravel filling layer and a bridge deck structure layer, and a railing is installed on the top of the arch bridge structure;

The stiffened corrugated steel plate-prestressed concrete composite arch ring and the stiffened corrugated steel plate end wall are formed by two layers of corrugated steel plate crests, wave crests, wave troughs and wave troughs corresponding to each other and fixedly connected;

Several prefabricated concrete slabs are arranged on the upper surface of the corrugated steel plate on the upper side of the stiffened corrugated steel plate-prestressed concrete composite arch to form transverse joints and longitudinal joints; the two layers of corrugated steel plates at the transverse joints and longitudinal joints are connected Two rows of elongated threaded studs are installed at all places to install and tension the prestressed steel bars at the transverse joints;

The stiffened corrugated steel plate end wall and stiffened corrugated steel plate-prestressed concrete composite arch ring are provided with several screw holes at the connection of the two layers of corrugated steel plates in the connection area, and bolts pass through the screw holes through the angle steel to connect the stiffened corrugated steel plate end wall and the stiffened corrugated steel plate. Steel plate-prestressed concrete composite arch ring fixed connection;

The connection area between the stiffened corrugated steel plate end wall and the stiffened corrugated steel plate-prestressed concrete combined arch ring is reinforced by a reinforcing structure arranged at the end of the transverse joint, and the reinforcing structure is connected at the two layers of corrugated steel plate of the stiffened corrugated steel plate end wall Set up group nails, and pour concrete at the transverse joints, longitudinal joints and group nails, and form a concrete lining at the group nails of the stiffened corrugated steel plate end wall.

Further, each layer of corrugated steel plate of the stiffened corrugated steel plate-prestressed concrete composite arch ring and the stiffened corrugated steel plate end wall is formed by horizontal and vertical splicing of corrugated steel plate units, and the transverse joints of adjacent corrugated steel plate units need to be staggered by 30-50cm .

Further, the prestressed steel bar is composed of multiple strands.

Further, joint reinforcement bars extend from the prefabricated concrete slab to the surrounding joints.

Further, the width of the transverse joint and the longitudinal joint is 0.4-0.6m, and the thickness is the same as that of the precast concrete slab.

Further, channel steel stiffening beams are installed in the longitudinal and vertical directions of the outer surface of the stiffened corrugated steel plate end wall.

Further, the anchor cables are anchored at the intersections of the channel steel stiffening beams corresponding to the stiffened corrugated steel plate end walls on both sides.

Further, the bridge deck structure layer is composed of a sub-base layer, a base layer and an asphalt surface layer; the thickness of the compacted sand layer is 0.5-0.6m.

Further, the elongated threaded studs and group studs have the same structure, and are composed of a screw rod, an upper nut and a lower nut; two layers of corrugated steel plates are clamped by the upper nut and the lower nut; wherein, the height of the screw should exceed the wave height of the corrugated steel plate. At least 10mm, the diameter should not be less than 12mm.

The beneficial effects of the utility model are as follows:

1. The stiffened corrugated steel plate-prestressed concrete composite arch ring can greatly enhance the rigidity, earthquake resistance and buckling resistance of the structure, and the corrugated steel plate on the upper side of the composite arch ring provides a permanent formwork for the installation of precast concrete slabs and joint concrete pouring. At the same time, the concrete on the top of the corrugated steel plate on the upper side improves the durability and fire resistance of the arch ring, effectively alleviates the corrosion of the steel plate, and thus reduces the reinforcement and maintenance costs of the arch ring during operation.

2. The stiffened corrugated steel plate end wall is replaced by the traditional concrete end wall, which reduces the dead load of the structure, thereby reducing the deformation and stress of the combined arch ring, and is easy to install, low in cost, and environmentally friendly. The two-way channel steel stiffening beam greatly enhances the stiffness and buckling resistance of the stiffened corrugated steel plate end wall.

3. Stiffened corrugated steel plate-prestressed concrete composite arch ring and stiffened corrugated steel plate end wall are connected by bolts through screw holes through angle steel, and are reinforced by the concrete lining-group nail structure arranged at the end of the transverse joint, which can Further enhance the connection rigidity of the combined arch ring and the end wall to ensure the synergistic force between the two.

4. The prestressed steel bar is stretched in the combined arch ring, and the low axial stiffness of the corrugated steel plate is used to greatly improve the prestressing efficiency of the concrete, increase the concrete compressive stress reserve, and reduce the risk of concrete cracking.

5. The anchor cable transforms the original structural system in which the end walls on both sides bear the pressure of the filling into a structural system in which the end walls on both sides and the filling are jointly stressed, which greatly improves the stiffness, buckling resistance and stability of the stiffened corrugated steel plate end walls. It can significantly alleviate the stress concentration at the connection between the end wall and the combined arch ring.

6. The extended threaded stud can not only connect the double-layer corrugated steel plate of the combined arch ring and the end wall, but also can be used as a shear connection between the concrete and the corrugated steel plate. The elongated and threaded surface of the stud further enhances the interoperability of the stud with the concrete. Compared with welded studs, extended threaded studs are safer and more convenient to install.

7. The utility model increases the proportion of prefabricated assembly components, reduces the workload of template installation and removal, steel bar binding, concrete pouring and maintenance, avoids stud welding work, greatly shortens the construction period, and reduces delays and impacts on traffic. In addition, the prefabricated assembly components of the present invention can be standardized and mass-produced in factories, which can ensure quality, save costs and facilitate transportation.

Description of drawings

1 is a perspective view of a combined arch bridge of the present invention;

Fig. 2 is the elevation view of the combined arch bridge of the utility model;

Fig. 3 is the composite arch bridge cross-section I-I figure of the utility model;

Figure 4 is a cross-sectional view of the stiffened corrugated steel plate-prestressed concrete composite arch ring;

Figure 5 is a partial detail view of the stiffened corrugated steel plate-prestressed concrete composite arch ring;

Figure 6a is a reinforced structural diagram of the connection area between the stiffened corrugated steel plate end wall and the combined arch ring;

Figure 6b is an enlarged view of the reinforcement structure in Figure 6a;

Figure 7a is the angle steel connection diagram of the stiffened corrugated steel plate end wall and the combined arch ring;

Figure 7b is an enlarged view of the angle steel connection in Figure 7a;

Fig. 8 is the utility model backfill soil layer distribution and construction drawing;

Figure 9 is a detailed view of the elongated threaded bolt;

In the figure, 1—cutting outline, 2—arch seat gravel cushion, 3—arch seat, 4—stiffened corrugated steel plate-prestressed concrete composite arch, 4-1—upper corrugated steel plate, 4-2—lower Side corrugated steel plate, 5—stiffened corrugated steel plate end wall, 5-1—outside corrugated steel plate, 5-2—inside corrugated steel plate, 6—channel steel stiffening beam, 7—anchor cable, 8—railing, 9—compacted sand , 10—crushed stone filling layer, 11—subbase layer, 12—base layer, 13—asphalt surface layer, 14—extended threaded bolt, 14-1—screw, 14-2—upper nut, 14-3—lower nut , 15—prestressed steel bar, 16—precast concrete slab, 17—transverse joint, 18—longitudinal joint, 19—concrete lining, 20—group nail, 21—angle steel, 22—bolt.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, Figure 2 and Figure 3, the utility model provides a prefabricated soil-covered corrugated steel plate-prestressed concrete composite arch bridge, including abutment crushed stone cushion 2, abutment 3, stiffened corrugated steel plate-prestressed Concrete composite arch ring 4, stiffened corrugated steel plate end wall 5, anchor cable 7, railing 8, compacted sand 9, crushed stone filling layer 10 and bridge deck structure layer. The foundation pit at the site of the arch bridge is excavated to form the excavation contour line 1, the foundation of the bottom surface of the foundation pit is leveled and compacted, and the crushed stone cushion of the arch seat 2 is evenly laid. The stiffened corrugated steel plate-prestressed concrete composite arch ring 4 is fixed between 3, the stiffened corrugated steel plate end walls 5 are installed on the lateral sides of the stiffened corrugated steel plate-prestressed concrete composite arch ring 4, and the stiffened corrugated steel plate end walls 5 on both sides pass through anchors The cable 7 is connected, the compacted sand 9 is filled in layers in the space surrounded by the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 and the stiffened corrugated steel plate end wall 5, and the compacted sand 9 is sequentially laid with gravel filling layers 10 and the bridge deck structure layer constitute an arch bridge structure, and a railing 8 is installed on the top of the arch bridge structure.

The arch seat 3 is formed by splicing prefabricated concrete arch seat segments, which avoids on-site construction procedures such as template installation and removal, steel bar binding, concrete pouring and maintenance, which can not only ensure the construction quality, but also shorten the construction period.

As shown in FIG. 1 and FIG. 2 , the stiffened corrugated steel plate end wall 5 is formed by the corrugated steel plate 5-1 on the outside and the corrugated steel plate 5-2 on the inside corresponding to each other and fixedly connected. Channel steel stiffening beams 6 are installed both longitudinally and vertically on the outer surface of the stiffened corrugated steel plate end wall 5 . Compared with the traditional concrete end wall, the stiffened corrugated steel plate end wall 5 reduces the dead load of the structure, thereby reducing the deformation and stress of the arch ring, and has the advantages of convenient installation, low cost and environmental protection. The channel steel stiffening beam 6 significantly enhances the stiffness and buckling resistance of the stiffened corrugated steel plate end wall 5 .

The outer corrugated steel plate 5-1 and the inner corrugated steel plate 5-2 are formed by horizontal and vertical splicing of corrugated steel plate units, and the transverse joints of adjacent corrugated steel plate units need to be staggered by 30-50 cm.

The anchor cables 7 are anchored at the intersections of the channel steel stiffening beams 6 corresponding to the stiffened corrugated steel plate end walls 5 on both sides, including corrugated steel pipes, prestressed steel strands, filled concrete, fixed steel bars and positioning steel plates; among them, the anchor cables 7 use The standard value of the tensile strength of the prestressed steel strand should not be less than 1860MPa; the number, distribution and tensile force of the anchor cables 7 should be determined according to factors such as vehicle load, filling type and height. The anchor cable 7 transforms the original structural system in which the stiffened corrugated steel plate end walls 5 on both sides bear the pressure of the filling, into a structural system in which the stiffened corrugated steel plate end walls 5 on both sides and the fill are jointly stressed, greatly improving the strength of the stiffened corrugated steel plate end walls 5. The rigidity, buckling resistance and stability of the reinforced corrugated steel plate can significantly alleviate the stress concentration at the connection between the stiffened corrugated steel plate end wall 5 and the stiffened corrugated steel plate-prestressed concrete composite arch ring 4.

As shown in Fig. 4 and Fig. 5, the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 is composed of the upper corrugated steel plate 4-1 and the lower corrugated steel plate 4-2. The crests, crests, troughs and troughs correspond to each other, and are fixedly connected. made. Several precast concrete slabs 16 are arranged on the upper surface of the upper corrugated steel plate 4-1, and a transverse joint 17 and a longitudinal joint 18 are formed; The elongated threaded bolts 14 are installed and tensioned at the prestressed steel bars 15 at the transverse joints 17 to finally form the reinforced corrugated steel plate-prestressed concrete composite arch ring 4 . The formed stiffened corrugated steel plate-prestressed concrete composite arch ring 4 can greatly enhance the structural rigidity, earthquake resistance and buckling resistance, and the upper corrugated steel plate 4-1 can provide precast concrete slab 16 installation, transverse joints 17 and longitudinal joints 18 Formwork for concrete pouring. At the same time, the concrete on the top of the corrugated steel plate 4-1 on the upper side improves the durability and fire resistance of the arch ring, effectively relieves the corrosion of the steel plate, thereby reducing the reinforcement and maintenance cost of the arch ring during operation.

The upper corrugated steel plate 4-1 and the lower corrugated steel plate 4-2 are formed by horizontal and vertical splicing of corrugated steel plate units, and the transverse joints of adjacent corrugated steel plate units need to be staggered by 30-50 cm.

The prestressed steel bar 15 is composed of multiple strands of steel strands, and the prestressing method is applied to the concrete; wherein, the standard value of the tensile strength of the prestressed steel bar 15 should not be less than 1860MPa. With the lower axial stiffness of corrugated steel plates, the applied prestress can be mostly transferred to the concrete, which improves the prestressing efficiency and the concrete compressive stress reserve, thereby reducing the risk of concrete cracking.

The prefabricated concrete slab 16 extends joint reinforcement bars to the surrounding joints, and the size of the prefabricated concrete slab 16 is determined according to factors such as structural span, width, bolt height, and equipment lifting capacity. The precast concrete slab 16 is convenient for factory standardized mass production, can reduce the workload of concrete pouring on site, and greatly speed up the construction progress.

The width of the transverse joint 17 and the longitudinal joint 18 is 0.4-0.6 m, and the thickness is the same as that of the precast concrete slab 16 .

The prefabricated concrete slab 16, the transverse joint 17 and the longitudinal joint 18 are all made of lightweight and high-strength concrete.

As shown in Figure 6a, Figure 6b, Figure 7a and Figure 7b, the stiffened corrugated steel plate end wall 5 and the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 are provided with a number of screw holes at the connection of the two layers of corrugated steel plates in the connection area. 22 Through the screw holes through the angle steel 21, the stiffened corrugated steel plate end wall 5 is fixedly connected to the stiffened corrugated steel plate-prestressed concrete composite arch ring 4; The area is reinforced by a reinforcing structure arranged at the end of the transverse joint 17, the reinforcement structure is provided with group nails 20 at the connection of the two layers of corrugated steel plate of the stiffened corrugated steel plate end wall 5, and the transverse joint 17, longitudinal joint 18 and Concrete is poured at the group nails 20, and a concrete lining 19 is formed at the group nails 20 of the stiffened corrugated steel plate end wall 5, which can further enhance the rigidity of the connection between the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 and the stiffened corrugated steel plate end wall 5. Ensure that the two work together.

The concrete lining 19 is made of light-weight high-strength concrete; the structure of a single stud in the group of studs 20 is the same as that of the elongated threaded stud 14 .

As shown in Figure 8, the bridge deck structure layer is composed of a sub-base layer 11, a base layer 12 and an asphalt surface layer 13; the sub-base layer 11, the base layer 12 and the asphalt surface layer 13 should be determined according to the road grade where the composite arch bridge is located and the vehicle load ; The layered thickness of the compacted sand 9 is 0.5-0.6m, the compaction degree of the compacted sand 9 in the vicinity of the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 is 0.92-0.95, and the compaction degree of other areas is 0.96-0.98.

As shown in Figure 9, the elongated threaded bolt 14 is composed of a screw rod 14-1, an upper nut 14-2 and a lower nut 14-3; two layers of corrugated steel plates are clamped by the upper nut 14-2 and the lower nut 14-3; Among them, the height of the screw 14-1 should exceed the wave height of the corrugated steel plate by at least 10mm, and the diameter should not be less than 12mm. The elongated threaded bolt 14 can not only connect the double-layer corrugated steel plate of the stiffened corrugated steel plate-prestressed concrete composite arch ring 4 and the stiffened corrugated steel plate end wall 5, but also can be used as a shear connection between the concrete and the corrugated steel plate. The elongated and threaded surface of the stud further enhances the interoperability of the stud with the concrete. Compared with the welded studs, the elongated threaded studs 14 are safer and more convenient to install, greatly shorten the construction period, and at the same time overcome the difficulty of transporting corrugated steel plates with welded studs.

The utility model increases the proportion of prefabricated assembly components, reduces the workload of template installation and removal, steel bar binding, concrete pouring and maintenance, avoids stud welding work, greatly shortens the construction period, and reduces delays and impacts on traffic. In addition, the prefabricated assembly components of the present invention can be standardized and mass-produced in factories, which can ensure quality, save costs and facilitate transportation.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (9)

1. An assembled earthing corrugated steel plate-prestressed concrete combined arch bridge is characterized by comprising an arch abutment broken stone cushion layer (2), an arch abutment (3), a stiffening corrugated steel plate-prestressed concrete combined arch ring (4), a stiffening corrugated steel plate end wall (5), an anchor rope (7), a railing (8), compacted sand (9), a broken stone filling layer (10) and a bridge deck structure layer;

the arch support broken stone cushion layer (2) is provided with arch supports (3), stiffening corrugated steel plate-prestressed concrete combined arch rings (4) are fixed between the two arch supports (3), stiffening corrugated steel plate end walls (5) are installed on the two transverse sides of the stiffening corrugated steel plate-prestressed concrete combined arch rings (4), the stiffening corrugated steel plate end walls (5) on the two sides are connected through anchor cables (7), compacted sand (9) is filled in a space surrounded by the stiffening corrugated steel plate-prestressed concrete combined arch rings (4) and the stiffening corrugated steel plate end walls (5) in a layered mode, broken stone filling layers (10) and bridge floor structure layers are sequentially laid on the compacted sand (9) to form an arch bridge structure, and railings (8) are installed on the top of the arch bridge structure;

the stiffening corrugated steel plate-prestressed concrete combined arch ring (4) and the stiffening corrugated steel plate end wall (5) are formed by mutually corresponding wave crests, wave troughs and wave troughs of two layers of corrugated steel plates and fixedly connecting the wave crests and the wave troughs;

a plurality of precast concrete plates (16) are arranged on the upper surface of the upper corrugated steel plate (4-1) of the stiffening corrugated steel plate-prestressed concrete combined arch ring (4) to form a transverse joint (17) and a longitudinal joint (18); two rows of elongated threaded studs (14) are arranged at the joints of the two corrugated steel plates of the transverse joint (17) and the longitudinal joint (18), and prestressed reinforcements (15) at the transverse joint (17) are installed and tensioned;

the stiffening corrugated steel plate end wall (5) and the stiffening corrugated steel plate-prestressed concrete combined arch ring (4) are respectively provided with a plurality of screw holes at the joint of the two layers of corrugated steel plates in the connecting area, and bolts (22) penetrate through the screw holes to fixedly connect the stiffening corrugated steel plate end wall (5) and the stiffening corrugated steel plate-prestressed concrete combined arch ring (4) through angle steel (21);

the connection area of the stiffening corrugated steel plate end wall (5) and the stiffening corrugated steel plate-prestressed concrete combined arch ring (4) is reinforced through a reinforcing structure arranged at the end part of the transverse joint (17), the reinforcing structure is provided with a group nail (20) at the joint of two layers of corrugated steel plates of the stiffening corrugated steel plate end wall (5), and concrete is poured at the transverse joint (17), the longitudinal joint (18) and the group nail (20).

2. An assembled soil-covered corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, wherein each layer of corrugated steel plate of the stiffening corrugated steel plate-prestressed concrete composite arch ring (4) and the stiffening corrugated steel plate end wall (5) is formed by transversely and longitudinally splicing corrugated steel plate units, and the transverse joints of the adjacent corrugated steel plate units are staggered by 30-50 cm.

3. An assembled earthing corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, characterized in that the prestressed reinforcement (15) is composed of a plurality of steel strands.

4. An assembled earthing corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, characterized in that the precast concrete plate (16) has joint bars extended to the circumferential joint.

5. An assembled earthing corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, characterized in that the width of the transverse joints (17) and the longitudinal joints (18) is 0.4-0.6m and the thickness is the same as that of the precast concrete slab (16).

6. An assembled earthing corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, characterized in that the stiffening corrugated steel plate end wall (5) is provided with channel steel stiffening beams (6) in the longitudinal and vertical directions.

7. An assembled earthing corrugated steel plate-prestressed concrete composite arch bridge according to claim 6, characterized in that the anchor cable (7) is anchored at the intersection of the channel steel stiffening beams (6) corresponding to the two side stiffening corrugated steel plate end walls (5).

8. An assembled earth-covered corrugated steel plate-prestressed concrete composite arch bridge according to claim 1, wherein said deck structure layer is composed of a sub-base layer (11), a base layer (12) and an asphalt surface layer (13); the layering thickness of the compacted sandy soil (9) is 0.5-0.6 m.

9. The assembled earth-covered corrugated steel plate-prestressed concrete composite arch bridge of claim 1, wherein the elongated screw-bolt nails (14) and the group nails (20) have the same structure and are composed of a screw (14-1), an upper nut (14-2) and a lower nut (14-3); two layers of corrugated steel plates are clamped through an upper nut (14-2) and a lower nut (14-3); wherein, the height of the screw (14-1) should exceed the wave height of the corrugated steel plate by at least 10mm, and the diameter should be not less than 12 mm.

Images