CN107090791B - Anti-rolling stone collision device for bridge pier in mountainous area and construction method thereof - Google Patents

Abstract

The invention discloses a mountain bridge pier rolling stone collision prevention device and a construction method thereof, wherein the mountain bridge pier rolling stone collision prevention device comprises bridge piers arranged on a bearing platform at one side of a mountain, three rows of bases which are distributed in an arrow shape are arranged on an inclined plane of the mountain, each base is provided with upright posts which are upwards vertically, the upright post rolling stone facing surfaces at two sides are provided with a plurality of connecting plates which are arranged at intervals from bottom to top, the tops of the upright posts at partial corresponding positions of the upright posts at two sides are provided with cross braces, and inclined braces are arranged between the middle upright post and the upright posts at the partial corresponding positions at two sides; the construction is completed through the steps of designing and manufacturing each component, pouring a base, installing an upright post, welding a connecting plate, welding a transverse strut, a diagonal strut, installing a wire netting and the like. The invention adopts the thought of 'easy dredging and difficult blocking', forces the rolling stone to change the motion trail away from the bridge pier, and the protection device cannot be impacted by too much energy, so that the overall stability is high.

Description

Anti-rolling stone collision device for bridge pier in mountainous area and construction method thereof

Technical field:

The invention relates to the protection technology of bridge piers, in particular to an anti-rolling stone collision device for bridge piers in mountainous areas and a construction method thereof.

Background technique:

Bridge piers are the key parts and weak links in bridge engineering, and they need to be protected during the operation of traffic engineering. Bridges located in alpine and canyon areas are often threatened by various geological disasters, including landslides, rolling rocks, mudslides, etc. These geological disasters may cause damage and destruction of bridge piers.

Rolling stone refers to the process in which individual rocks lose stability from the surface of slopes and cliffs for some reason, and finally reach a static state through falling, rebounding, jumping, rolling or sliding. When there are engineering facilities within the rolling stone movement range When a certain loss is caused, it constitutes a rolling stone disaster. For example, on July 25 ^, 2009, a large-scale collapse occurred in the dangerous rocks at the high position of the mountain on the right bank of the Minjiang River (with a drop of 500m), and the total volume of the collapse exceeded 10,000 cubic meters. The 8 ^# bridge pier broke instantly, causing the 60m-long girders of the 8th and 9th spans to fall, the 10th and 11th spans of the girders slipped 26cm in the direction of Yingxiu due to traction, the expansion joints at the 11th abutment were damaged, and the rolling stone disaster caused 3 12 people were killed, 12 were injured, and 7 vehicles were damaged. It can be seen that it is necessary to develop anti-rolling stone impact devices for bridge piers.

Chinese Patent Authorization Announcement No. CN103790124B discloses a flexible anti-rockfall collision device for bridge piers. Consuming energy, the corrugated steel slats can be partially replaced and repaired after being deformed by collisions. The limitation of this patent is that the proposed device belongs to the method of "meeting the enemy head-on", which forces the moving rolling stones to finally become static. The protective device needs to withstand a very large impact energy, and its size and strength should be large enough, otherwise it will be difficult to be effective. Block the attack of rolling stones; under the attack of large mass and fast rolling stones, the protection ability of the corrugated steel slats is limited, easy to damage and need to be replaced frequently; the accumulation of rock and soil in front of the base needs to be cleaned frequently , otherwise it will affect the performance of the subsequent anti-collision function.

The technical problem to be solved by the present invention is to design an anti-rolling stone collision device for bridge piers in mountainous areas. On the one hand, it can effectively protect the bridge piers. The impact energy is relatively small, so that the material size of the device is more economical and reasonable than the traditional design.

Invention content:

In order to make up for the deficiencies of the existing technical problems, the purpose of the present invention is to provide a rolling stone collision prevention device for bridge piers in mountainous areas and its construction method, which has a simple structure and strong protection ability, and provides a reliable protection for the rolling stone collision resistance of bridge piers in mountainous areas device.

Technical scheme of the present invention is as follows:

The anti-rolling stone collision device for bridge piers in mountainous areas is built on the sloped mountain intended to protect the rolling stone surface next to the bridge pier. It is characterized in that three rows of arrow-shaped bases are installed on the slope of the mountain, and each There are vertical upright columns, and the columns on both sides facing the rolling stone are provided with a plurality of connecting plates at intervals from bottom to top. Diagonal braces are arranged between the columns at corresponding positions.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that the connecting plate is made of strip-shaped steel plates, and a plurality of strip-shaped steel plates are symmetrically welded to the anti-rolling stone surfaces of the columns on both sides, and the connecting plate is parallel to the surface of the inclined mountain body.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that the plane formed by the length and thickness of the connecting plate is welded to the side of the column.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that the base is made of reinforced concrete, and there are uniform and symmetrical pre-embedded anchor bolts in the base, and the number and position of the anchor bolts are the same as those at the bottom flange of the column. The number and location of the bolt holes on the plate match each other.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that barbed wire is installed on the side of the columns on both sides facing away from the rolling stones.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that the number of cross braces and diagonal braces is not less than two.

The anti-rolling stone collision device for bridge piers in mountainous areas is characterized in that, among the three rows of arrow-shaped bases, the included angle between the lines connecting the bases on both sides is not greater than 90°.

A construction method of an anti-rolling stone collision device for a bridge pier in a mountainous area, comprising the following steps:

1), design and manufacture of each component:

According to the position of the bridge pier to be protected and the attack direction of the rolling stones on the mountain, the direction of the two wings of the anti-rolling stone collision device and the specific position of each base are designed, the height of the columns and the lengths of the connecting plates, cross braces, and diagonal braces are determined, and corresponding components are made for supply On-site construction use;

2), pouring base:

The foundation of each foundation on the steep mountain is treated. After excavating the soil within the buried depth of the foundation, the pre-embedding work of planting reinforcement is carried out, and then the formwork is erected and the reinforcement is arranged, the anchor bolts are pre-embedded, and then the foundation is poured concrete and maintenance;

3) Install the column:

Put the bolt holes on the flanges at the bottom of each column into the matching anchor bolts, and fix them with nuts, so that each column is plumb and vertical, and complete the installation of each column;

4) Welding connection plate:

Evenly weld each connecting plate to the rolling stone surface of the column, and weld the plane formed by the length and thickness of the connecting plate to the side of the column;

5) Welding cross braces and diagonal braces:

According to the design plan, multiple cross braces and diagonal braces are set between the columns at the same position on the two wings, so that the protective device forms a stable structural system;

6) Install barbed wire:

Install barbed wire on the side of the back rolling stone surface of each column to catch and intercept small gravel and block stones to ensure the safety of the pier below the anti-rolling stone device; Antirust treatment is carried out on the surface, that is, the construction work of the protective device is completed.

Compared with the prior art, the present invention has the following advantages:

1. The present invention does not adopt the design method of "facing the enemy head-on", but adopts the protection idea of "sparse rather than blocked", forcing the rolling stone to change its trajectory away from the bridge pier, instead of making the rolling stone become static. On the one hand, the protective device will not On the other hand, the purpose of protecting the pier is achieved, so the material size of the protective device does not need to be too large, and the materials used are relatively small and the cost is low;

2. The arrow-shaped configuration arrangement of the present invention maximizes the overall rigidity along the impact direction of the rolling stone, and it adopts multiple cross braces and diagonal braces for reinforcement, so the overall stability is high;

3. When the rolling stone of the present invention collides with the device, the rolling stone only contacts the side of the connecting plate in the thickness direction. In this direction, the connecting plate has the largest stiffness and the smallest contact area, which makes the rolling stone easy to break and decompose, thereby effectively dissolving and dispersing the impact of the rolling stone energy.

4. Most of the columns in the prior art are in a tilted state, that is, the columns are not in a vertical and vertical state. This practice leads to a large impact force and collision energy between the rolling stone and the protective device; the column of the present invention is in a vertical and vertical state. That is, the device as a whole is in a plumb, vertical state, and the collision energy and impact force between the rolling stone and the proposed anti-rolling stone device are relatively small, which is beneficial to improving the overall stability of the device.

Description of drawings:

Fig. 1 is a structural schematic diagram of the anti-rolling stone collision device of the present invention.

Fig. 2 is a front view of the anti-rolling stone collision device of the present invention.

Fig. 3 is a top view of the anti-rolling stone collision device of the present invention.

Fig. 4 is a top view of the anti-rolling stone collision device of the present invention from the top of the mountain.

Fig. 5 is a bottom view of the anti-rolling stone collision device of the present invention from the foot of the mountain.

Fig. 6 is a three-dimensional schematic diagram of the anti-rolling stone collision device of the present invention.

Fig. 7 is a schematic diagram of the connection between the base and the column of the present invention.

Fig. 8 is a front view of the connection between the column and the connecting plate of the present invention.

Fig. 9 is a three-dimensional schematic diagram of the connection between the column and the connecting plate of the present invention.

Fig. 10 is a schematic diagram of the installation of the barbed wire fence of the present invention.

Fig. 11 is a schematic diagram of the construction of the base of the present invention.

Fig. 12 is a schematic diagram of the installation of the column of the present invention.

Fig. 13 is a schematic diagram of the installation of the connecting plate of the present invention.

Fig. 14 is a schematic diagram of the installation of the horizontal brace and the diagonal brace of the present invention.

Fig. 15 is a schematic diagram of the installation of the barbed wire fence of the present invention.

Explanation of reference signs: 1. Cap; 2. Pier; 3. Mountain; 4. Base; 5. Column; 6. Cross brace; 7. Connecting plate; 8. Diagonal brace; Disk; 11. Anchor bolts. The direction of the arrow in the picture is: the direction of the rolling stone attack.

Detailed ways:

See attached picture:

An anti-rolling stone collision device for a bridge pier in a mountainous area, comprising a base 4, a column 5, a cross brace 6, a connecting plate 7 and a diagonal brace 8, the flange plate 10 at the bottom of the column 5 is set on the anchor bolt 11 on the base 4 and fixed with a nut , multiple rows of connection plates 7 are welded on the rolling stone surface of each column 5, the anti-rolling stone collision device is distributed symmetrically in the shape of an arrow as a whole, and each column 5 is in a plumb, vertical state; a total of multiple channels are arranged between the columns 5 on both sides of the symmetry Cross brace 6 and diagonal brace 8; when the rolling stone strikes, it collides with both sides non-perpendicularly and obliquely. After the collision, the trajectory of the rolling stone changes and avoids the position of the pier to be protected and continues to move downstream, as shown in Figure 1.

The present invention is located on the inclined mountain 3 next to the proposed protective pier 2, and the proposed protective pier 2 should be located within the protection range of the anti-rolling stone collision device. The location, as shown in Figure 2~Figure 6.

Generally, the location where a bridge pier in a mountainous area may be attacked by rolling stones can be comprehensively judged according to the topography, and finally one or more potential directions of rolling stone attacks can be determined; A protection area, and the bridge pier 2 to be protected is located inside the protection area.

The base 4 is formed by pouring reinforced concrete. There are uniform and symmetrical embedded anchor bolts 11 in the base 4. The number and position of the anchor bolts 11 are the same as the number and position of the bolt holes on the flange 10 at the bottom of the column 5. The positions match each other, as shown in Figure 7. The diameter of the bolt holes on the flange 10 should be greater than the diameter of the embedded anchor bolts 11 .

In order to improve the bearing capacity and stability of the base 4, planting bars and anchor rods can be arranged in the base 4, so that the base 4 and the mountain body 3 are closely connected. The bearing capacity and stability of the base 4 should meet the strength and stability requirements under various combined loads under complex working conditions. Since the length of the brace 8 is relatively large, it is necessary to set up a base 4 for the brace 8 separately, as shown in FIG. 3 and FIG. 5 .

Connecting plate 7 is welded on the rolling stone face of each column 5, connecting plate 7 is parallel to the surface of the inclined mountain body, and the plane formed by the length and thickness of connecting plate 7 is welded to each other with column 5 sides, as shown in Fig. 8 and 9.

Because the surface of the mountain is inclined, the elevations of the bases 4 and the columns 5 are different, but the bases 4 and the columns 5 are basically distributed parallel to the surface of the mountain. Therefore, the connecting plate 7 is also parallel to the surface of the inclined mountain, so that the integrity and symmetry of the protective device are the best. The plane formed by the length and thickness of the connecting plate 7 is welded to the side of the column 5, even if the side of the connecting plate 7 is welded to the column 5, the rolling stone only contacts the side in the thickness direction of the connecting plate, and the rigidity of the connecting plate in this direction is the largest, and the contact The smallest area makes the rolling stones easy to break and decompose, thus effectively dissolving and dispersing the impact energy of the rolling stones.

Since the side of the connecting plate 7 and the column 5 have a small contact area, it is necessary to dig out a certain area at the welding position of the connecting plate 7 to form an arc surface, so that the welding area between the connecting plate 7 and the column 5 is large, and the overall strength High, so that the connecting plate 7 can withstand the impact of larger energy rolling stones, as shown in Figure 9.

The anti-rolling stone collision device is arrow-shaped and symmetrically distributed along the rolling stone attack direction, the two wings are inclined to the downstream of the rolling stone attack direction, and a plurality of cross braces 6 and diagonal braces 8 are arranged between the columns 5 at the same position of the two wings, as shown in Figure 5 and Figure 6 shows. The arrow-shaped configuration arrangement maximizes the overall rigidity along the impact direction of the rolling stone, and it is reinforced with multiple cross braces 6 and diagonal braces 8, so the overall stability is high.

The present invention is distributed in an arrow shape, and the two wings are inclined to the downstream of the rolling stone attack direction, so that the device does not "confront" the rolling stone, and the protective device only restrains and changes the direction of the rolling stone, keeping it away from the intended protective pier 2 behind the device. After the rolling stone collides with the connecting plate 7 on the protective device obliquely intersecting with its moving direction, its moving direction changes, and continues to move downstream along a random direction avoiding the protective device. The effect of the protective device is not to make the rolling stone reach a static state, so the impact energy it receives is not large.

Barbed wire 9 is installed on the column back rolling stone face side, and it does not directly contact with the rolling stone in motion, but can encircle, intercept volume less gravel, block stone, guarantee the safety of the bridge pier below the anti-rolling stone device. The installation of barbed wire 9 is as shown in Figure 10.

Preferably, the anti-rolling stone collision device is provided with at least two cross braces 6 .

Preferably, the anti-rolling stone collision device is provided with at least two diagonal braces 8 .

Preferably, the included angle between the two wings of the anti-rolling stone collision device is not greater than 90°.

A construction method of an anti-rolling stone collision device for a bridge pier in a mountainous area is described in detail as follows:

1), design and manufacture of each component:

According to the position of the bridge pier to be protected and the attack direction of the rolling stones on the mountain body, the direction of the two wings of the anti-rolling stone collision device and the specific positions of each base 4 are designed, the height of the column 5 and the length of the connecting plate 7, the cross brace 6, and the diagonal brace 8 are determined, and Make corresponding components for on-site construction use.

The spacing between adjacent columns 5 should be reasonably designed so that the connecting plates 7 everywhere do not undergo obvious deformation under the impact of rolling stones under complex working conditions. If necessary, other auxiliary measures can be added to improve the overall stability of the device.

2), pouring base:

The foundation of each base 4 on the steep mountain 3 is treated, and after excavating the soil within the buried depth of the foundation, the pre-embedding work of planting bars is carried out, and then the formwork is set up and the reinforcement is arranged, and the anchor bolts 11 are pre-embedded, and then the base 4 is pre-embedded. Concrete pouring and curing, as shown in Figure 11.

The center positions of the anchor bolts 11 on each side base 4 should be on the same straight line, so that the sides of the uprights 5 to be installed subsequently are on the same straight line, so as to ensure that the connecting plate 7 and the uprights 5 of the two wings are tightly welded as a whole. In order to improve the bearing capacity and stability of the base 4, planting bars and anchor rods can be arranged in the base 4, so that the base 4 and the mountain body 3 are closely connected.

3) Install the column:

Insert the matching anchor bolts 11 into the bolt holes on the flange 10 at the bottom end of each column 5, and fix them with nuts to complete the installation of each column, as shown in Figure 12.

After the column 5 is installed, the vertical central axis of each side column 5 should be on the same plane.

4) Welding connection plate:

Each connecting plate 7 is uniformly welded on the rolling stone surface of the column 5, and the plane formed by the length and thickness of the connecting plate 7 is welded to the side of the column 5, as shown in FIG. 13 .

The connecting plates 7 are distributed parallel to each other, and the distance between adjacent connecting plates 7 is equal and should not be too large. The side of connecting plate 7 is impacted by rolling stones, and the rigidity of connecting plate 7 in this direction is the largest, and the impact resistance is the strongest.

5) Welding cross braces and diagonal braces:

According to the design plan, a plurality of cross braces 6 and diagonal braces 8 are arranged between the columns 5 at the same position on the two wings, so that the protective device forms a stable structural system, as shown in Figure 14.

The cross braces 6 and the diagonal braces 8 form multiple triangular stabilization systems inside the device, effectively maintaining the overall stability and improving the ability to resist the impact of rolling stones.

6) Install barbed wire:

Barbed wire 9 is installed on the back rolling stone face side of each column 5, catches up, intercepts smaller crushed stones, block stones, guarantees the safety of the bridge pier below the anti-rolling stone device, as shown in Figure 15. Anti-rust treatment is carried out on the surfaces of columns, connecting plates, horizontal braces, diagonal braces, barbed wire, etc., and the construction of the protective device is completed.

Barbed wire 9 is installed on the back rolling stone face of each column 5, and it can not be subjected to the direct impact of rolling stone, so its intensity need not be too large.

The present invention is not limited to the above-mentioned specific implementation methods. According to the above-mentioned content, according to the common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technical idea of the present invention, the present invention can also make other equivalent forms. Amendments, substitutions or alterations all fall within the protection scope of the present invention.

Claims (6)

1. The construction method of the mountain bridge pier rolling stone collision prevention device is characterized in that the mountain bridge pier rolling stone collision prevention device is built on an inclined mountain body of a rolling stone facing surface beside a bridge pier to be protected, three rows of bases distributed in an arrow shape are installed on the inclined face of the mountain body, vertical upright posts are installed on each base, a plurality of connecting plates are arranged on the rolling stone facing surfaces of the upright posts on two sides from bottom to top at intervals, cross braces are installed on the tops of the upright posts on the positions corresponding to part of the upright posts on two sides, and inclined braces are arranged between the upright posts on the positions corresponding to the middle upright post and the two side parts;

the connecting plates are strip-shaped steel plates, the strip-shaped steel plates are symmetrically welded on the facing roller surfaces of the upright posts on the two sides, and the connecting plates are parallel to the ground surface of the inclined mountain;

the construction method of the mountain bridge pier rolling stone collision prevention device comprises the following steps:

1) Designing and manufacturing each component: according to the position of the bridge pier to be protected and the attack direction of mountain rolling stones, the trend of two wings of the rolling stone collision prevention device and the specific positions of the bases are designed, the height of the upright posts and the lengths of the connecting plates, the cross braces and the diagonal braces are determined, and corresponding components are manufactured for site construction;

2) Pouring a base: treating the foundation of each base on a steep mountain, excavating soil in the foundation burial depth range, then embedding the reinforcing steel bars, erecting templates, arranging reinforcing steel bars, embedding anchor bolts, and then pouring and maintaining the concrete of the base;

3) And (3) installing an upright post: the bolt holes on the flange plates at the bottom ends of the stand columns are sleeved into the matched anchor bolts, and the anchor bolts are fixed by nuts, so that the stand columns are in a vertical state, and the installation work of the stand columns is completed;

4) Welding a connecting plate: uniformly welding all the connecting plates on the facing roller surface of the upright post, and mutually welding a plane formed by the length and the thickness of the connecting plates and the side surface of the upright post;

5) Welding a cross brace and an inclined brace: according to the design scheme, a plurality of cross braces and diagonal braces are arranged between the upright posts at the same positions of the two wings, so that the protection device forms a stable structural system;

6) And (3) installing a wire netting: an iron wire net is arranged on one side of the back rolling stone surface of each upright post to bag and intercept broken stones and stone blocks with smaller volumes, so that the safety of bridge piers below the anti-rolling stone device is ensured; and performing rust prevention treatment on the surfaces of the upright posts, the connecting plates, the cross braces, the inclined braces, the wire meshes and the like, thus finishing the construction operation of the protective device.

2. The construction method of the mountain bridge pier rolling stone collision preventing device according to claim 1, wherein the plane formed by the length and the thickness of the connecting plate is welded with the side surface of the upright post.

3. The construction method of the rolling stone collision prevention device for the bridge pier in the mountain area according to claim 1, wherein the base is formed by pouring reinforced concrete, anchor bolts are uniformly and symmetrically embedded in the base, and the number and the positions of the anchor bolts are matched with the number and the positions of the bolt holes on the flange plate at the bottom end of the upright post.

4. The construction method of the mountain bridge pier rolling stone collision prevention device according to claim 1, wherein the wire netting is arranged on one side of the back rolling stone surface of each upright post on the two sides.

5. The construction method of the mountain bridge pier rolling stone collision prevention device according to claim 1, wherein the number of the transverse braces and the inclined braces is not less than two.

6. The construction method of the mountain bridge pier rolling stone collision prevention device according to claim 1, wherein the included angle of connecting lines of two side bases of the three rows of bases distributed in an arrow shape is not more than 90 degrees.