A double-row PLC work method pile cofferdam and steel trestle combined construction method for over-deep pit ponds

By combining the double-row PLC-based cofferdam construction method with a steel trestle bridge, the problems of long construction cycles and insufficient safety in deep pits were solved, resulting in shorter construction cycles and improved safety, thus ensuring soil stability and construction safety.

CN119195185BActive Publication Date: 2025-11-18THE THIRD CONSTR CO LTD OF CHINA CONSTR THIRD ENG BUREAU
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Patent Information

Application Number
CN202411446356.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-16
Publication Date
2025-11-18
Estimated Expiration
2044-10-16

AI Technical Summary

Technical Problem

Existing technologies for road construction across deep pits suffer from long construction periods and insufficient construction safety, especially when using steel pipe piles and steel trestle bridges, where equipment installation is complex and can easily affect the stability of the piles.

Method used

The construction method adopts a combination of double-row PLC-based cofferdam and steel trestle bridge, including steel pipe pile positioning, pile driving, pile horizontal connection, anchoring, water-driving backfilling, installation of load-bearing beams and Bailey beams. Combined with the optimization of dewatering well layout, the well spacing is determined by function calculation to ensure soil stability and construction safety.

Benefits of technology

It shortened the construction period, improved construction safety and the success rate of sheet pile interlocking connections, enhanced the function of access roads for road construction within the cofferdam, and ensured soil stability and construction safety.

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Abstract

The present application relates to the construction technology field of trestle, especially to a kind of double-row PLC method pile cofferdam and steel trestle combined construction method for deep pit pond, comprising: construction preparation;Positioning and pouring according to construction requirements;Pouring method pile;Inter-pile flat link;Anchor pulling;Water displacement method fills soil;Install load-bearing crossbeam and bailey beam;Pave bridge deck;Repeat the above steps until method pile cofferdam construction is completed;Remove steel trestle after construction is completed;Drainage well is also provided, and the interval between next dewatering well and current dewatering well is determined according to function f (T) and function f (h). Compared with the prior art, the beneficial effects of the present application are that by setting dewatering well in cofferdam and determining the layout of dewatering well according to the actual situation of construction, the soil moisture content is effectively reduced, the effective stress of soil is increased, the stability of soil body in cofferdam is ensured, and the safety of subsequent construction is ensured.
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