WO2018223502A1 - Modular arch bridge - Google Patents

Abstract

A modular arch bridge, comprising an arch frame (5) formed and assembled by means of panel-and-tube assembly units joined in length and width directions of the arch bridge. Backfill (6) or a girder structure is provided between the arch frame (5) and a bridge deck. The panel-and-tube assembly units comprise a curved corrugated panel (1) and tubes (3) arranged in recesses thereof on an inner side, concrete (4) is filled in the tubes (3), and a direction of ribs of the curved corrugated panel (1) is perpendicular to the width direction of the arch bridge. The arch bridge is formed by assembling the panel-and-tube assembly structures, and the combination of the curved corrugated panels (1) and tubes (3) significantly enhances the strength of the overall structure. The arched support steel frame is in an interior of the arch bridge, and the backfill is provided on an upper portion thereof, thus creating a tube-related arching effect, providing superior sectional warping resistance, and ensuring safety of pipes.

Description

Assembled arch bridge Technical field

The present invention relates to an arch bridge, and more particularly to an upper arch bridge assembled from a steel-mixed composite structure.

Background technique

At present, most small and medium-sized arch bridges are mainly made of reinforced concrete. However, reinforced concrete arch bridges have high construction cost, long construction period, large consumption of sand and gravel, and are not environmentally friendly. There are also some arch bridges that are steel arch bridges, but the steel structures of these arch bridges are trusses. The structure is mainly, the cost is high; and the structure of the road surface is also steel, so that the pavement layer and the steel structure are not tightly bonded, and the layer is easily cracked. In addition, when the structure close to the road surface is steel, the disturbance is large. The pavement layer is repeatedly deformed and easily cracked.

Therefore, it is urgent to solve the above technical problems.

Summary of the invention

OBJECT OF THE INVENTION: It is an object of the present invention to provide an assembled arch bridge which is structurally stable, excellent in performance, and energy-saving and environmentally friendly.

Technical solution: the assembled arch bridge of the present invention comprises: forming an arch frame by the combination of the tube and tube unit along the length and width direction of the arch bridge, and providing a backfill or truss structure between the arch frame and the bridge deck; wherein the plate and tube combination The unit comprises a curved corrugated plate and a pipe located in the inner groove thereof, and the pipe is filled with concrete, and the corrugated path of the curved corrugated plate is perpendicular to the width direction of the arch.

Wherein, in the plate and tube combination unit, a plurality of pipes are arranged in parallel in the inner groove of the curved corrugated plate.

In the plate tube assembly unit, the two curved sides of the curved corrugated plate are provided with a circumferential flange, and the opposite other sides are provided with a longitudinal flange.

The plate and tube combination unit is firstly spliced along the length direction of the arch bridge to form a single arch structure, and then the single arch structure is spliced along the width direction of the arch bridge to obtain an arch frame. Wherein, when the plate and tube combination unit is spliced along the length direction of the arch bridge, the pipes located in the groove inside the corrugated plate are connected end to end to form a communication structure.

The arches are continuously disposed along the length of the arch bridge to form a multi-span arch. A shunt tube is arranged between the arch frame and the bridge deck. A pedestal is provided at both ends of the arch, and the pedestal is disposed on the buttress. The curved corrugated plate is a curved steel corrugated plate, the pipe is a steel pipe, and the arch frame is an arched steel frame.

Advantageous Effects: Compared with the prior art, the advantages of the present invention are as follows: First, the arch bridge is formed by splicing a combination of curved corrugated plates and concrete pipes, and the advantages of the corrugated plates and the pipes are complementary, except that they have their own structural strength. , also increased the structural strength of the other side, so that the strength of the entire structure is greatly increased, resulting in a plus The effect of the second. Secondly, the inside of the arch bridge is an arched bearing steel frame. The upper part of the arch has a certain height (for example, ≥0.6m) of backfill material (sand, earth or gravel, etc.), which can produce tube arching effect, and has high structural strength and can reduce the waveform. The wall thickness is thick, the cost is saved; the cross-section bending performance is superior, and it can adapt to special working conditions such as high filling and soft foundation; the strength is high, and the strength of the whole structure will not be affected even under the static load and dynamic load frequently. The safety is effectively guaranteed; the installation is convenient and the construction progress is guaranteed. Finally, the bearing steel frame is different from the general square structure frame. The square frame structure can not produce the common force effect of the pipe and soil; when the backfilling is completed, the pipe and the soil are jointly subjected to the force, and the trough or peak of the concrete steel pipe and the corrugated plate Tightly pressed, the trough or peak of the corrugated plate limits the columnar instability of the concrete steel pipe. At the same time, the concrete steel pipe limits the buckling failure of the corrugated plate in the trough or peak of the corrugated steel plate, and increases the bearing capacity of the corrugated plate.

DRAWINGS

Figure 1 is a cross-sectional view of a curved corrugated plate of the present invention;

2-1, 2-2 are perspective views of the curved corrugated plate of the present invention;

3 is a schematic structural view of an arch bridge bearing steel frame of the present invention;

Figure 4 is a schematic structural view of an arch bridge of the present invention;

Figure 5 is an enlarged view of point A in Figure 4;

6 is a schematic structural view of a continuous multi-arch bridge according to the present invention;

Figure 7 is an experimental state diagram of an arch bridge of the present invention;

Fig. 8 is an experimental state diagram of an arch bridge carrying steel frame of the present invention.

detailed description

The technical solution of the present invention will be further described below with reference to the accompanying drawings.

As shown in FIG. 1, FIG. 2-1 and FIG. 2-2, the plate and tube assembly unit of the present invention is provided with a pipe 3 in the inner groove 2 of the curved corrugated plate 1, where the curved corrugated plate 1 is preferably corrugated steel plate. The pipe 3 is preferably a steel pipe, and the pipe 3 may be disposed in the groove continuously or at intervals. The shape of the groove may be in various forms; the steel pipe may be in close contact with the arc groove inside the corrugated steel plate, when there are multiple steel pipes The steel pipes are arranged in parallel. The inner wall of the groove 2 has the same curvature as the tube 3 which is in contact with it, and the concrete 3 is filled in the pipe 3. In order to facilitate the subsequent assembly, the longitudinal flanges 101 are provided on both sides perpendicular to the corrugation direction of the curved corrugated plate 1, and the circumferential sides of the arcuate sides are provided with circumferential flanges 102, the curvature of the circumferential flanges 102 and the curved corrugated plates 1 The curvature is consistent. In order to improve the excellent performance of the plate and tube combination unit, the corrugation direction of the curved corrugated plate 1 is perpendicular to the width direction of the arch bridge, where the width direction of the arch bridge refers to the direction perpendicular to the span direction of the arch bridge in FIG.

3 is a schematic structural view of an arch-shaped bearing steel frame, wherein the plate-and-tube combination unit is first spliced along the length direction of the arch bridge to form a single arch structure 501, and then the single-arch structure 501 is spliced along the width direction of the arch bridge to obtain an arch frame 5 , that is, the arched bearing steel frame. Wherein, the longitudinal flanges 101 in the adjacent single steel frame structure are staggered from each other. Of course, the splicing manner of the arch-shaped bearing steel frame is not limited to the above, and the curved corrugated plate 1 can be spliced first along the width direction of the arch bridge, and then along Splicing in the length direction. At the same time, the base of the arched bearing steel frame is provided with a base 104, which is placed on the buttress 8, as shown in FIG. Fig. 5 is a partially enlarged view showing the connection of the adjacent curved corrugated plates 1 when the curved corrugated plates 1 are spliced along the length of the arch bridge. In the figure, the corrugated plates are closely attached to the pipes 3 to obtain a combined structure, and the pipes 3 are filled with concrete 4.

As shown in Fig. 6, the arch-shaped bearing steel frame is continuously arranged along the length of the arch bridge to form a multi-span steel frame, which not only can improve the bearing performance of the arch bridge, but also can realize the arch bridge on the wider river surface. A backfill soil 6 or truss structure is arranged between the arch bearing steel frame and the bridge deck, wherein the backfill soil 6 has a thickness of ≥0.6 m, and the backfill material may be sand, earth or gravel arch bearing steel frame and surrounding backfilling Soil 6 produces a common force effect on the pipe and soil, and the structural strength is large. Of course, the backfill 6 can also be replaced by a truss structure. For multi-span continuous structures, in order to facilitate flood discharge, one or more shunt pipes 7 are arranged between the single-span arch bridge structures to reduce the impact pressure of the water flow on the side of the arch bridge to protect the stability and safety of the arch bridge structure.

Experimental report on curved corrugated plate, concrete steel pipe and steel-concrete composite curved corrugated plate

(I) Experimental purpose: To test the bearing capacity of individual curved corrugated plates, individual concrete steel pipes and steel-corrugated composite curved corrugated plates.

(2) Experimental steps:

1. Excavate the pit hopper 15 with a length of 5m, a width of 2.5m and a depth of 1.5m on the ground, and lay out experimental materials and equipment in it, as shown in Figure 7.

2. The curved corrugated plate 1 (waveform 380x140mm, wall thickness 5mm) is used as the test piece, and the pressure sensor 14 is mounted on the surface of the test piece, and the two ends of the test piece are connected to the concrete base 9 through the support plate and the bolt, which The reinforcing bars 10 are disposed laterally between the concrete bases 9, and the vertical flat steel plates 11 are disposed opposite to both sides of the corrugated plates. The bottom of the flat steel plates 11 is disposed on the concrete base 9, and the top portion passes through two upper and lower parallel high-strength steel plates. 12 connection, a hydraulic cylinder 13 is arranged between the two steel profiles, and sand 17 is filled in the space surrounding the high-strength steel 12, the test piece and the flat steel plate 11 on both sides as a backfill material to ensure a certain thickness of the backfill layer. At the same time, the flat steel plate 11 on both sides, the high-strength steel 12 at the top and the steel 10 at the bottom enclose the test piece into a frame structure, which is a soil pit outside. After the layout is completed, the hydraulic cylinder 13 is started and slowly pressurized until the test piece is broken, and the maximum value of the pressure sensor is read and recorded.

3. The concrete steel pipe (outer diameter φ140mm, wall thickness 5mm) is used as the test piece, and the bending curvature is the same as the arc of the curved corrugated plate, and the two ends are disposed on the concrete base 9. In order to ensure the validity of the force data of the concrete steel pipe, a 16 mm thick curved steel plate 16 is arranged between the concrete steel pipe and the surrounding sand (the function of the curved steel plate is to block the sand and not participate in the stress of the test piece), the curved steel plate 16 is a plurality of pieces stacked, when stacked, there is a gap 18 between the plates, which can be mutually displaced, as shown in FIG. Other arrangements are the same as the curved corrugated plates as test pieces, not all of which are shown in FIG. After the layout is completed, the hydraulic cylinder 13 is started and slowly pressurized until the test piece is broken, and the maximum value of the pressure sensor is read and recorded.

4. Repeat the above experiment with the combination of the corrugated steel plate and the concrete steel pipe of the same specification as above, and read and record the maximum value of the pressure sensor.

5. Replace the specifications (wavelength, wave height, wall thickness and diameter of the steel pipe) of the corrugated steel plate and the concrete steel pipe. Repeat the above experiment to obtain the pressure data corresponding to the corresponding specifications of the multiple sets.

(3) Finite element analysis

1, for 560x200x5mm (individual corrugated steel plate)

Cylinder load Kpa	Sensor - Maximum stress value Mpa
60 (equivalent to 2 m fill)	60.6
90 (equivalent to 4 m fill)	90.8
120 (equivalent to 6 meters fill)	121.1
160 (equivalent to 8 m fill)	161.4
200 (equivalent to 10 m fill)	201.8

From the data in the above table, the maximum stress and the load are approximately linear. It can be deduced that if the corrugated steel plate of Q345 material is used and the material yield is 345Mpa, the maximum load can be 341Kpa under such specifications and section size, and the equivalent fill height is 17 Meter.

2, for

(separate concrete steel pipe)

Cylinder load Kpa	Sensor - Maximum stress value Mpa
60 (equivalent to 2 m fill)	3.61
90 (equivalent to 4 m fill)	5.40
120 (equivalent to 6 meters fill)	7.19
160 (equivalent to 8 m fill)	9.59

200 (equivalent to 10 m fill)

11.8

From the data in the above table, the maximum stress and the load are approximately linear. It can be concluded that if the steel tube is made of Q235, the material yield is 235Mpa, the concrete is C40, and the material yield is 40Mpa. The maximum load can be accepted under such specifications and section size. 678Kpa, the equivalent fill is 34 meters.

3, for

(corrugated steel plate + concrete steel pipe)

Cylinder load Kpa	Sensor - Maximum stress value Mpa
60 (equivalent to 2 m fill)	16.6
90 (equivalent to 4 m fill)	24.9
120 (equivalent to 6 meters fill)	33.2
160 (equivalent to 8 m fill)	44.3
200 (equivalent to 10 m fill)	55.4

From the data in the above table, the maximum stress and load are approximately linear. It can be deduced that if the steel plate with Q345 material is used, the material yields to 345Mpa, the maximum load can be 1246Kpa under such specifications and section size, and the equivalent fill height is 62. Meter.

(4) Experimental conclusions

The maximum load of the corrugated steel pipe is 341Kpa; the maximum load of the concrete pipe is 678Kpa; the maximum load of the plate and pipe structure is 1246Kpa.

The composite structure of the tube and tube is 3.65 times of the load of the single corrugated steel tube; the combined structure of the tube and tube is 1.84 times of the load of the single concrete steel tube; the combined structure of the tube and tube is the sum of the loads of the two separate corrugated steel tubes + individual concrete steel tubes. 1.22 times.

In summary, through the experimental data of multiple groups, it can be found that under the joint force of the pipe and soil, the bearing capacity of the curved corrugated plate and the curved concrete pipe is the bearing capacity of the curved corrugated steel plate and the curved concrete steel pipe. And 1.23 to 1.4 times.

Claims (9)

1. The utility model relates to a prefabricated arch bridge, which comprises: forming an arch frame by a combination of a tube and a tube unit along a length and a width direction of the arch bridge, and providing a backfill or truss structure between the arch frame and the bridge surface; wherein the plate and tube combination The unit comprises a curved corrugated plate (1) and a pipe (3) located in the inner groove (2) thereof, and the concrete (4) is filled in the pipe (3), and the corrugation direction of the curved corrugated plate (1) is The width of the arch is vertical.
2. The prefabricated arch bridge according to claim 1, characterized in that in the plate tube assembly unit, a plurality of pipes (5) are arranged in parallel in the inner groove (2) of the curved corrugated plate (1).
3. The prefabricated arch bridge according to claim 1 or 2, wherein in the plate tube assembly unit, a circumferential flange (102) is disposed on two curved sides of the curved corrugated plate (1), and the other two are opposite The longitudinal flange (101) is provided on the side.
4. The prefabricated arch bridge according to claim 1, wherein the plate and tube combination unit is first spliced along the length direction of the arch bridge to form a single arch structure (103), and the single arch structure (103) is along the arch bridge. The arch is spliced in the width direction to obtain the arch (5).
5. The prefabricated arch bridge according to claim 4, characterized in that: when the plate and tube assembly unit is spliced along the length of the arch bridge, the pipe (3) located in the inner groove (2) of the curved corrugated plate (1) is end to end. Connected to form a connected structure.
6. The prefabricated arch bridge according to claim 1, characterized in that the arches (5) are continuously arranged along the length of the arch bridge to form a multi-span arch.
7. The prefabricated arch bridge according to claim 1, characterized in that a shunt tube (7) is arranged between the arch (5) and the bridge deck.
8. The prefabricated arch bridge according to claim 1, characterized in that both ends of the arch are provided with a base (104), and the base (104) is arranged on the buttress (8).
9. The prefabricated arch bridge according to claim 1, characterized in that the curved corrugated plate (1) is a curved steel corrugated plate, the pipe (3) is a steel pipe, and the arch (5) is an arched steel frame.

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