Detailed explanation of river dredging construction scheme

Lead: Today, Rabbit will introduce some knowledge about river dredging. Everyone knows that a lot of silt will be added to the river every year, so it is necessary to dredge the river regularly. However, this river dredging project is basically a large-scale project, and it must go through normal procedures. First of all, a certain river dredging plan must be made. In the next time, Rabbit will introduce you to the construction plan of Weihe River dredging.

1. Organization: The Weihe River Regulation Project is adjacent to the old river channel, and there are large construction machinery on the construction site, which can be used for dredging the old Weihe River. It is planned to use multiple crawler excavators for dredging in groups and sections. In the process of dredging, it is necessary to maintain the normal water supply of the old Weihe River, and to dredge half and live water half; Dredge the southern half of the river first, and then dredge the northern half.

2. Cofferdam: A brick cofferdam with a thickness of 500mm is set downstream of Zhongzhou Avenue Bridge, which is flush with the top surface of the abutment foundation of Weihe Bridge, and will be used as a cofferdam when the Weihe River regulation project is connected with the old river (the gate is 3m wide and has a wooden structure). The downstream cofferdams are set in sections according to the dredging length. They are planned to be set on the south side of Fishery Association and downstream of Tangzhuang Bridge respectively, and the height should be 0.7m higher than the water surface. The downstream cofferdam adopts soil structure, and the outer side is covered with waterproof materials (such as wide colored strips).

3. Drainage: After the cofferdam construction is completed, the accumulated water in the river course will be drained to the downstream river course of the cofferdam by using the sewage pump, and the longitudinal catchment ditch will be excavated along the bottom edge of the old river course to collect the accumulated water in the river course before the downstream cofferdam. Dig a sump in the upstream of the cofferdam, and use a high-power sewage pump to discharge the accumulated water to the downstream of the cofferdam.

4. Dredging: Three excavators form a group to form a ladder queue. An excavator at the bottom of the river is in front, cleaning the sediment at the bottom of the river to the south while digging, and placing the sediment above the slope as much as possible, and excavating a catchment ditch with a depth of about 50 cm at the bottom line on the south side of the river bottom; The second one is above the slope, and the sludge excavated by the first excavator and the turf roots on the slope are cleaned to the beach on the Henan side, and the third one is on the last side to collect the sludge excavated by the second excavator.

The dredging in the southern half is completed, and the sediment in the northern channel is cleaned in the same way. At this time, the accumulated water has been concentrated in the southern half of the river, and there is no need to dig a longitudinal catchment ditch at the bottom line of the North River. After dredging, the river bottom will be leveled. It is planned to use a small tailless crawler excavator with manual excavation for dredging under Heizhuang Bridge. Mechanical excavation shall not touch the bridge foundation, and the surrounding of the pier shall be cleaned manually. The clearance under Anzhuang Bridge and Tangzhuang Bridge is low, and the deck width is 14m. Excavator hook shovel method is used to drive the sediment out of the bridge deck, and then the river bank is excavated. The original cone-shaped slope protection structure shall not be destroyed when the hook shovel retreats.

5. Cleaning: dry and dehydrate the sludge in the beach and transport it to the owner with a well-sealed transport vehicle.

6. Cofferdam removal: The cofferdam of Zhongzhou Avenue Bridge is reserved with movable gates to meet the normal water flow. After the Weihe River regulation project is completed and the old river channel is connected, it will be demolished to restore the smooth flow of the river channel. After the upstream dredging of cofferdam is completed, the downstream cofferdam can be removed and the river channel can be restored.

7. Flood control and flood fighting: According to the Emergency Plan for Dredging and Flood Control of Weihe River, when receiving the flood warning information, stop dredging immediately, mobilize flood control, start the emergency plan and make good preparations for flood control. After obtaining the exact information, all construction machinery will be evacuated from the river within 30 minutes, and the downstream cofferdam will be dredged to ensure the smooth flow of the river.

Taking Weihe River as an example, we introduced the river dredging scheme. I believe that after reading it, you have a certain understanding of the river dredging scheme. In fact, the beginning of a project is not so simple. First of all, we must go through all the relevant formalities. In fact, there are many things that need to be coordinated in the construction site, which cannot cause pollution in the urban area and affect the public security situation. Here we will introduce you to the river dredging plan.

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