CN-121992803-A - Partition-adjusting precipitation system for drainage decompression cavity of double-layer cofferdam

CN121992803ACN 121992803 ACN121992803 ACN 121992803ACN-121992803-A

Abstract

The invention relates to the technical field of cofferdams, in particular to a partition-adjusting precipitation system for a drainage decompression cavity of a double-layer cofferdam, which is arranged in the drainage decompression cavity between an outer steel sheet pile and an inner steel sheet pile and comprises partition water collecting units, a water collecting unit and a water collecting unit, wherein the partition water collecting units comprise at least two water collecting partitions arranged in the drainage decompression cavity, and each water collecting partition is internally provided with at least one decompression drainage well; the system comprises a water level monitoring unit, a partition drainage pipeline, a water level monitoring unit, a control unit and a water level signal control unit, wherein the partition drainage pipeline is respectively communicated with each water collecting partition through a drainage pump, partition valves are arranged on the partition drainage pipeline, the water level monitoring unit is electrically connected with the water level monitoring unit, the partition valves and the drainage pump in parallel, the water level signal output by the water level monitoring unit controls the partition valves to be opened and closed, and the drainage pump to be opened and closed.

Inventors

PAN ZIYANG
HUANG JINGEN
CHEN JIAN
Li Xunjin
XU MING
WANG JINBO
TAO TAO
Meng ya

Assignees

安徽建工建设投资集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (8)

1. A partition-adjusting precipitation system for a double-layer cofferdam drainage decompression cavity is arranged in the drainage decompression cavity between an outer steel sheet pile (1) and an inner steel sheet pile (2), and is characterized by comprising the following components: The subarea water collecting unit comprises at least two water collecting subareas arranged in the drainage pressure reducing cavity, and each water collecting subarea is internally provided with at least one pressure reducing drainage well (4); the partition drainage pipelines are respectively communicated with the water collecting partitions through drainage pumps, and partition valves are arranged on the partition drainage pipelines; the water level monitoring unit is used for outputting a water level signal; And the control unit is electrically connected with the water level monitoring unit, the partition valve and the drainage pump in parallel, controls the partition valve to be opened and closed and the drainage pump to be started and stopped according to a water level signal output by the water level monitoring unit, and is used for adjusting the water level in the drainage decompression cavity to a target interval.
2. The zoned regulated precipitation system for a double deck cofferdam drainage pressure relief cavity of claim 1, wherein said water level monitoring unit comprises at least one water level sensor or float switch.
3. The zoned regulated precipitation system for a double cofferdam drainage pressure relief cavity of claim 1, wherein said zoned drainage pipe is fitted with a check valve for preventing backflow.
4. The zoned precipitation system for double-deck cofferdam drainage decompression chamber of claim 1, wherein the zoned drainage pipeline is provided with a filtering sand setting filter screen for reducing the risk of blockage.
5. The zone regulated precipitation system for a double cofferdam drainage pressure relief cavity of claim 1, further comprising an alarm buzzer for emitting an alarm signal when the water level exceeds a safety threshold, said zone valve failing.
6. The zoned regulated precipitation system for a double cofferdam drainage pressure relief cavity of claim 5, further comprising a manual bypass line conductively connected to said drainage pressure relief cavity for emergency drainage in the event of a failure or power failure of said control unit.
7. The partition-regulated precipitation system for a double-deck cofferdam drainage relief cavity of claim 1, wherein a crushed stone filter layer is arranged at the bottom of the drainage relief cavity as a counter-filtering structure, and the relief drainage well (4) is arranged in the crushed stone filter layer.
8. The zoned regulated precipitation system for double cofferdam drainage pressure relief cavity of claim 7, wherein at least one in-layer support (3) is provided between said outer steel sheet pile (1) and said inner steel sheet pile (2).

Description

Partition-adjusting precipitation system for drainage decompression cavity of double-layer cofferdam Technical Field The invention relates to the technical field of cofferdams, in particular to a partition-adjusting precipitation system for a drainage decompression cavity of a double-layer cofferdam. Background In the underwater engineering of bridge foundation, port and wharf, the double-layer cofferdam can effectively reduce the water pressure born by the inner cofferdam by means of the drainage decompression cavity formed between the inner cofferdam and the outer cofferdam, and is one of the core structures for guaranteeing the safety of underwater construction. However, the drainage system of the existing double-layer cofferdam has the obvious technical defects that the double-layer cofferdam reduces the water pressure of the inner-layer cofferdam through a drainage decompression cavity, the drainage system is usually started and stopped manually or is a single drainage passage, the water seepage quantity difference at different positions is difficult to adapt, the problem that the local water level is abnormally increased or frequently fluctuates easily occurs, the stress state of the inner-layer cofferdam is suddenly changed, the seepage risk is increased, the stress unbalance of a supporting structure in the cofferdam is even caused, and the water stopping effect and the running stability of the cofferdam are seriously affected. At present, the technical scheme of realizing partition water level monitoring, partition accurate drainage and automatic regulation aiming at a drainage decompression cavity is lacking in the industry, the pressure control problem caused by uneven water seepage distribution is difficult to solve, and the safety reliability and the application range of a cofferdam structure are restricted, so that the improvement on the existing drainage system and the cofferdam structure is needed, and in view of the problem, the partition regulation precipitation system for the double-layer cofferdam drainage decompression cavity is provided. Disclosure of Invention The invention aims to solve the defects in the background art and provides a partition-regulated precipitation system for a double-layer cofferdam drainage decompression cavity. In order to solve the technical problems, the invention adopts the following technical scheme: a drainage decompression intracavity that is used for subregion of double-deck cofferdam drainage decompression chamber to adjust precipitation system, sets up between outside steel sheet pile and inboard steel sheet pile, includes: The subarea water collecting unit comprises at least two water collecting subareas arranged in the drainage pressure reducing cavity, and at least one pressure reducing drainage well is arranged in each water collecting subarea; the partition drainage pipelines are respectively communicated with the water collecting partitions through drainage pumps, and partition valves are arranged on the partition drainage pipelines; the water level monitoring unit is used for outputting a water level signal; And the control unit is electrically connected with the water level monitoring unit, the partition valve and the drainage pump in parallel, controls the partition valve to be opened and closed and the drainage pump to be started and stopped according to a water level signal output by the water level monitoring unit, and is used for adjusting the water level in the drainage decompression cavity to a target interval. Preferably, the water level monitoring unit includes at least one water level sensor or float switch. Preferably, the partition drain pipe is provided with a check valve for preventing backflow. Preferably, a filtering sand setting filter screen for reducing the blocking risk is arranged on the partition drain pipe. Preferably, the precipitation system further comprises an alarm buzzer for sending an alarm signal when the water level exceeds a safety threshold value and the partition valve fails. Preferably, the dewatering system further comprises a manual bypass pipeline connected with the drainage pressure reducing cavity in a conducting mode, and the manual bypass pipeline is used for emergency drainage when the control unit fails or is powered off. Preferably, the bottom of the drainage decompression cavity is provided with a broken stone filtering layer as a reverse filtering structure, and the decompression drainage well is arranged in the broken stone filtering layer. Preferably, at least one layer of internal support is arranged between the outer steel sheet pile and the inner steel sheet pile. Compared with the prior art, the invention has the beneficial effects that: compared with the existing manual start-stop or single-channel drainage, the invention reduces the fluctuation of the water level in the cavity and improves the cofferdam decompression effect, has the functions of partition redundancy, safety interlocking an