Nghiên cứu nâng cao hiệu quả thu hồi vì chống thép trong đường lò có tiết diện từ 9-15 m2

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Tác giả: Vũ Đinh Đặng, Quang Phục Lê, Khắc Lĩnh Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Công nghiệp Mỏ, 2024

Mô tả vật lý: tr.18-25

Bộ sưu tập: Báo, Tạp chí

ID: 460902

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In this study, a solution is presented to enhance the efficiency of the steel arch support removal process. This is achieved through the utilization of hydraulics and mechanical structures to create a combination propping equipment. The device supporting the dismantling of steel arch support consists of two parts: the front rack and the rear rack, which are linked and controlled to move by cylinders. The rear rack (has a structure similar to the hydraulic support gantry used in the coal mining tunnel, but the top beam is redesigned to be closest to the profile of the tunnel) includes a domed roof connected to the side beams by a hinge. Support equipment is controlled by cylinders, hydraulic cylinder support, and pillar base. The top beam of the rear rack is dome-shaped for the purpose of increasing the contact of the roof beam with the roof of tunnel. This device has a simple structure suitable for tunnel of different sizes, moves easily without the need for additional support devices, and has a support mechanism for removing and with drawing the support pillar. The top of the furnace roof is covered, thus limiting the phenomenon of falling rocks. The top beam has a profile similar to the furnace line profile, helping the roof maintain its previous structure, reducing pressure on the roof beam by minimizing the phenomenon of soil and rock collapse when the support is removed. Besides, it helps increase the contact area and reduce stress concentration on the top beam.Nghiên cứu này trình bày giải pháp nâng cao hiệu quả của quá trình thu hồi vì chống thép bằng cách sử dụng thủy lực và kết cấu cơ khí tạo thành tổ hợp thiết bị chống. Thiết bị hỗ trợ tháo dỡ vì chống gồm hai phần: giá trước và giá sau được liên kết và điều khiển di chuyển bằng xi lanh. Giá sau (có cấu tạo gần giống giàn chống sử dụng trong lò chợ, tuy nhiên phần xà nóc được thiết kế lại sao cho gần với biên dạng của đường lò nhất) bao gồm mái hình vòm được liên kết với xà bên bằng bản lề và được điều khiển bởi xi lanh, cột thủy lực và đế đỡ giá chống. Phần xà nóc của giá sau có hình vòm với mục đích tăng độ tiếp xúc của xà nóc với mái. Thiết bị này có kết cấu đơn giản phù hợp với các đường lò có kích thước khác nhau, di chuyển dễ dàng không cần thêm các thiết bị hỗ trợ, có cơ cấu hỗ trợ tháo và rút chân vì chống, phía trên nóc lò được che kín vì vậy hạn chế được hiện tượng đá rơi. Xà nóc có biên dạng gần giống với biên dạng đường lò giúp mái giữ nguyên được cấu trúc trước đó, làm giảm áp lực lên xà nóc do giảm tối đa hiện tượng phá hỏa khi đã tháo vì chống, đồng thời tăng diện tích tiếp xúc làm giảm ứng suất tập trung trên xà nóc.

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