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www.hg9505.com [On Meikailong] Meilong has added a "security lock" to the bridge, and Mom no longer has to worry about me crossing the bridge

[On Meikailong] Meilong has added a "security lock" to the bridge, and Mom no longer has to worry about me crossing the bridge

Public number: Humanities Meilong Source: Time: 2020-02-21 01:33:26

Millennium Tongzhou vitality north stream

Hermit

In the past two days, ordinary people often saw many people busy on the edge of bridges in Meilong Town.

Maybe you are also curious

What are they doing

It turns out

These people are using damaged conditions on the bridge

Check it out and sort it out ~

Let Xiaobian take you to see how the investigation and sorting out of these bridges are going, and how will the follow-up work be promoted?

The rivers and canals in Meilong Town are vertical and horizontal, and there are many ponds. The bridge has become an important channel connecting the village houses. However, because many rural bridges are "high in age", with simple structures and low load levels, these bridges are facing considerable safety risks as the usage rate and service life increase year by year.

In this regard, Meilong Town strengthened the quality management of rural roads and bridges, carefully examined the bridges on 46 rural roads in the town, and sorted out the bridges with medium or severely damaged bridges.

Which are the most damaged bridges?

Among them, the 8th team of Xingnan Village Huaqiao Port Bridge involves the construction of an ecological green belt in the outer ring, so it will not be maintained for the time being. The Xixi Bridge west of Lianhua Road Bridge in Shujian Village has been demolished. 进行大型维修。 Therefore, Meilong Town will mainly focus on the remaining five bridges: Xuli Village Songlang Middle Liuleitang Bridge, Caoxing Village Xikang Caojiagang Bridge, Aiguo Village Jinjiatang Liuleitang Bridge, and Xujing Village 6 teams. Liuleitang Bridge and Meisheng Taxation Station South Shengligang Bridge are undergoing major maintenance.

 

The five bridges need to undergo "major surgery". How will they be repaired?

Liulitang Bridge in Songlang Middle of Xujing Village

Xuli Village Songlang Middle Liuleitang Bridge is located in Xujing Village and spans Liuleitang. It is a north-south single-span reinforced concrete double-curved arch bridge. The total length of the bridge is 31.9m. The upper structure of the bridge is composed of 4 arch waves. The lower structure adopts a gravity abutment, with simple fractures at the abutment, and reinforced concrete railings on both sides. At present, no load limit signs are set on the bridge heads at both ends.

Damage:

The concrete on the bottom surface of the arch wave is damaged, and the main reinforcement is distorted. The concrete on the outside surface of the arch wave is severely damaged, the main reinforcement is distorted and the reinforcement is corroded.

In addition, there are many large areas of concrete damage and exposed rust on the underside of the arch wave, and there are local concrete damage and exposed rust on the underside of other arch waves.

The concrete pavement on the southern slope of the bridge abutment has a large area of settlement and chipping. The bumps on the road are obvious, and pedestrians tend to trip.

solution:

Add elastic body expansion joints to prevent rainwater from seeping down and corroding the table cap

Add elastic body expansion joints to prevent rainwater from seeping down and corroding the table cap

Secondly, the abutment of the abutment is obliquely cracked, the concrete at the crack is cleaned, and then the crack is poured to seal it. The horizontal cracks and vertical cracks on the bridge deck are closed with modified asphalt to prevent rainwater from eroding the steel bars due to crack infiltration and reducing the durability of the structure.

Caojia Village Xikang Caojiagang Bridge 2

Caoxing Village Xikang Caojiagang Bridge No. 2 is located in Caoxing Village and spans Caojiagang. It is a north-south 3-span simple-supported hollow slab bridge. The total length of the bridge is 22.6m. The deck is paved with reinforced concrete. The abutment of the bridge is provided with expansion joints of rubber sheets. At present, no load limit signs are set on the bridge heads at both ends.

Damage:

Obvious signs of water seepage on the pier and abutment surfaces

The reinforced concrete pavement above the bridge pier is cracked and damaged on a large area, and the steel bar is exposed to rust. The reinforced concrete pavement is exposed on a large area, with local cracking and damage, aging, and exposed steel plates.


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solution:

First, the entire bridge reinforced concrete deck pavement was cut out, and the new thickness of the reinforced concrete deck pavement of the bridge deck was 15 cm, and a double-layer reinforced mesh was laid. Secondly, the full bridge structure has different degrees of concrete damage and exposed rust on the steel bar. The concrete that has shelled on the surface is removed, and the exposed rusted steel bar is rusted. After cleaning, it is repaired with special polymer repair mortar to repair the collapsed parts Fill with good dense fillers, and then rebuild the broken stones.

Liujiaotang Bridge in Jinjiatang, Aiguo Village

Jinjiatang Liuleitang Bridge in Aiguo Village is located in Aiguo Village and spans Liuleitang. It is a north-south single-span reinforced concrete double-curved arch bridge. The total length of the bridge is 31.6m. The upper structure of the bridge is composed of three arch waves. The lower structure adopts gravity abutments and reinforced concrete railings on both sides. At the south end of the bridge, there is a height limitation measure of 2.2m, which is limited to small vehicles and pedestrians.

Damage:

Due to the impact of the ship passing under the bridge, the main arch ring is damaged and the force cross section is weakened, which will reduce the bearing capacity of the main arch ring. In addition, the main arch ring and the arch structure (belly arches, shelving columns and beams) have local concrete damage and exposed corrosion of the reinforcing steel.

Local concrete damage of main arch ring and exposed corrosion of reinforcing steel

Crack on the side of the north-south abutment  

solution:

First, increase the cross-section, thoroughly remove rust from exposed rusty reinforcing steel bars, bind the reinforcing steel mesh after cleaning, and increase the reinforcement sheath. In order to ensure a better combination of old and new concrete, a certain number of connecting steel bars need to be planted on the original arch structure, and the planting position of the arch foot is implanted into the abutment arch abutment.

Second, the modified asphalt is used to seal the cracks on the bridge deck to prevent rainwater from corroding the steel bars due to the infiltration of the cracks and reducing the durability of the structure. Finally, grouting and grouting is performed on the abutment cracks.

Six Leitang Bridge of Xuye Village 6

The Xulei Village Six Team Liuleitang Bridge is located in the Xulei Village and spans Liuleitang. It is a single-span reinforced concrete double-curved arch bridge with a north-south trend. The total length of the bridge is 32.0m. At present, there are no load limit signs on the bridge ends.

Damage:

The east and west sides of the southern end of the bridge belly are vertically cracked at the joints with the curved arch plate. Corresponding transverse cracks exist in the reinforced concrete pavement and railing base of the bridge deck.

A horizontal misalignment occurred at the overlap between the abutment at the northern end of the bridge and the curved arch plate above it. In addition, the pavement on the slopes of the bridge heads at the two ends of the north and south settled and the traffic was bumpy. More silt accumulates on both sides of the bridge deck.

solution:

Modified asphalt is used to seal the cracks on the bridge deck to prevent rainwater from eroding the steel bars due to crack infiltration and reducing the durability of the structure. The vertical cracks at the joints of the eastern and western sides of the southern end of the solid belly section with the micro-curved plates of the abdominal arch are closed by special crack infusion glue. Derusting exposed rusty steel bars and removing mud on bridge deck in time. After the repair is completed, the bridge will be inspected regularly to prevent the bridge deck from cracking and breaking again.

South Shengligang Bridge at Meilong Water Station

Meilong Water Station South Shengligang Bridge is located in Meilong Water Station, spanning Shengli Harbor, and is a single-span reinforced concrete double-curved arch bridge with a north-south trend. The total length of the bridge is 25.3m, and steel railings are used on both sides. At the north end of the bridge, there are isolation pier only for non-motor vehicles and pedestrians.

Damage:

There are many transverse cracks in the reinforced concrete pavement of the bridge. Partial concrete damage at the bridgehead slope at the southern end. Both the east and west sides of the abdominal arch at the north and south ends are closed, and a comprehensive inspection cannot be performed.

The east and west sides of the ventral arch at the north and south ends are closed

solution:

Firstly, the existing simple fracture seam is chiseled to remove debris in the simple fracture seam, and then an elastic-plastic expansion joint is added in place. Secondly, the full bridge structure has different degrees of concrete damage and exposed rust on the reinforcement. Remove the concrete on the surface, remove the rust on the exposed rusted reinforcement, and clean it with a special polymer repair mortar after cleaning. Finally, the illegal side wall on the main hole of the main arch was removed.

It is understood that all bridge safety inspections have been completed, and the detailed engineering design stage is currently underway. All inspections will begin in May this year and all projects will be completed by the end of this year. At that time, each bridge will be provided with a load sign to remind passing vehicles to extend the service life of village-to-village bridges.

Source: Shanghai Minhang, Zhencheng Investment Company

Humanity Meilong (renwenmeilong)


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