Âu thuyền kết hợp khoang xả cân bằng nước trong vận hành các công trình dâng nước xây dựng theo công nghệ đập trụ đỡ

Abstract

Pillar dam is an increasingly popular technology. Many large rivers in central Vietnam are now required to construct structures to prevent salinity in combination with keeping fresh and rising water. Pillar dam are a preeminent construction technology not only in terms of structure but also ensure flood drainage during construction.

In order to build a weir on the river, a very important issue is the energy dissipation of the building when operating the gate. In the process of water retention, the upstream water level is always much higher than the downstream so opening the gate in these cases will cause downdrift erosion because the erosion protection reinforcement for the construction still only a simple structure as rock gabions or precast concrete slabs. In constructions with a lock, the lock design solution combined with a water balance gate up-downstream is both safe and economical.

Research results of this lock structure have been applied in the design of the Dinh river downstream weirs in Ninh Thuan province to lower the upstream water level from +2.50 to equal with the downstream water level in a time sufficient to operate the safe opening of the main gates of the construction.

Keywords: Dam, ship-lock, pillar dam, dam of downstream Dinh river, culvert water discharge