Joint treatment method for enabling anchor rods to densely penetrate through lining waterproof layer in large range

Abstract

The invention discloses a joint treatment method for enabling anchor rods to densely penetrate through a lining waterproof layer in a large range. The joint treatment method comprises the steps: 1, mortar leveling is conducted on the surface of steel fiber reinforced concrete, and mortar trowelling treatment is conducted on root pits of exposed sections of the anchor rods; 2, a flexible waterproofmaterial is laid outside a mortar leveling layer, and the exposed sections of the anchor rods are wrapped with the flexible waterproof material to form an inverted skirt hemline structure; 3, the flexible waterproof material and the exposed anchor rods are firmly bound through binding wires or cotton cloth strips, and the wrapped tail ends of the anchor rods are sealed through expansion rubber sealing rings; and 4, spraying film waterproof construction is adopted, so that a spraying reinforced concrete layer, the mortar leveling layer, a flexible waterproof material layer and a spraying filmwaterproof layer are sequentially divided from the surrounding rock excavation face to waterproof completion, and the ends of the anchor rods penetrate out of the spraying film waterproof layer. The waterproof treatment problem that the anchor rods densely penetrate through a lining in the large range is solved, the failure of the waterproof layer of the tunnel lining is avoided, meanwhile, the process is simplified, and the structural strength of a tunnel main body supported by the anchor rods is improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering waterproofing, in particular to a node treatment method for anchor rods passing densely through a lining waterproof layer in a large range, and is particularly suitable for waterproofing treatment in ultra-large-span tunnels. Background technique [0002] At present, waterproof boards and buffer layers are often laid between the primary lining and the inner lining in composite-lined tunnels for waterproofing. Such a waterproof system has the following disadvantages: (1) The waterproof board itself cannot be closely attached to the concrete. Protrusions, etc. are easy to puncture the waterproof board, resulting in water leakage; (2) In the case of large cavities and unevenness in the wall concrete, when pouring the secondary lining, the waterproof board will be subject to greater tension, and local parts will become thinner or even damaged , especially the joints are prone to fract...

AI Technical Summary

Problems solved by technology

[0002] At present, waterproof boards and buffer layers are often laid between the primary lining and the inner lining in composite-lined tunnels for waterproofing. Such a waterproof system has the following disadvantages: (1) The waterproof board itself cannot be closely attached to the concrete. Protrusions, etc. are easy to puncture the waterproof board, resulting in water leakage; (2) In the case of large cavities and unevenness in the wall concrete, when pouring the secondary lining, the waterproof board will be subject to greater tension, and local parts will become thinner or even damaged , especially the joints are prone to fracture and damage. The joint between the waterproof board and the waterproof board is a weak link, and a little carelessness will lead to the failure of the entire waterproof system; capacity, the groundwater may spread in the space behind the waterproof board and affect the secondary lining; (4) Due to the rheological properties of the surrounding rock, when the stress of the surrounding rock is adjusted in the later stage and natural disasters such as earthquakes occur, the surrounding rock and the initial support will be deformed , where the base surface is uneven or there are protruding points, the waterproof board is prone to puncture damage, resulting in the failure of the waterproof layer; (5) At present, the waterproof board is laid manually, and the laying quality cannot be guaranteed, and the rivet laying or nailless welding process is used , will cause some damage to the waterproof board, and it is also prone to quality problems; (6) There may be some auxiliary facilities on the primary support base surface, such as angle steel, expansion bolts, steel fibers that are not completely covered, and anchor rods that are not cut clean First class, the most influential factor on waterproof construction is the anchor head. Before the conventional waterproof board is laid, the anchor head should be completely cut off at the root, and the surface should be smoothed with mortar to prevent puncture damage to the waterproof board.

[0003] To sum up, there are still various problems in the current waterproof treatment methods in composite lining tunnels, which may easily lead to failure of the waterproof layer; In the case of the waterproof layer, the bolt head is completely cut off at the root, which increases the cutting process and reduces the structural strength of the bolt support to a certain extent.

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