Phương pháp Top-down hệ dầm tầng hầm thay thế hệ Shoring chống vách tầng hầm

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Tác giả: QUANG VINH PHAN, THANH BÌNH TRẦN, ĐÌNH HỮU PHÚC VĂN

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2023

Mô tả vật lý: tr.109

Bộ sưu tập: Metadata

ID: 342074

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Hiện nay, một trong những phương pháp phổ biến trong việc thi công phần ngầm các công trình dân dụng là phương pháp Bottomup sử dụng hệ Shoring-Kingpost [1]–[3]. Phương pháp này có ưu điểm là dễ dàng thi công, lắp dựng hệ thép hình
tạo được sự thông thoáng và chiếu sáng trong quá trình thi công. Tuy nhiên, nhược điểm của phương pháp này là thời gian thi công kéo dài và chi phí cao. Bài báo này đề xuất một phương án thi công phù hợp, trong đó sử dụng hệ dầm bê tông cốt thép (BTCT) của chính kết cấu phần ngầm kết hợp với hệ cột chống thép hình Kingpost tạo thành khung chịu lực trong quá trình thi công. Kết cấu này cũng đồng thời được giữ lại làm kết cấu chịu lực trong quá trình sử dụng công trình. Kết quả nghiên cứu cho thấy phương pháp này hoàn toàn khả thi đối với các công trình có phần ngầm và đem lại các lợi ích như: tiết kiệm chi phí, thời gian thi công và giải quyết vấn đề chiếu sáng và thông thoáng. Từ khoá: Top-down
bottom-up
thi công
phần ngầm
ShoringKingpost
hệ dầm.Nowadays, one of the most popular solutions for underground constructions is the Bottom-up method using the Shoring-Kingpost system [1]–[3]. This kind of excavation methodology is easy to manipulate and install the steel components
generate good ventilation and illumination during construction stage. However, its disadvantages are the long construction time and a high construction cost. This paper proposes an appropriate underdround excavation methodology in which the reinforced concrete (RC) beams of the underground structures are combined with the vertical Kingpost steels to generate a support structure during the construction phase. This support structure is also retained during the service-life of the structure. Results from calculations and comparisons reveal that this method is feasible and brings great benefits such as: saving construction costs and construction time, as well as providing good ventilation and illumination for construction. Keywords: Top-down
bottom-up
excavation
underground
Shoring-Kingpost
beam systems.

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