A Node Treatment Method for Anchor Rods Densely Penetrating the Lining Waterproof Layer in a Large Range

Abstract

The invention discloses a node treatment method for a large-scale intensive penetration of an anchor rod through a lining waterproof layer. The first step is to perform mortar leveling on the surface of the steel fiber concrete, and to perform mortar leveling on the root pit of the exposed section of the anchor rod; The second step is to lay flexible waterproof material outside the mortar leveling layer, and the flexible waterproof material wraps on the exposed section of the anchor rod in an inverted skirt structure; the third step is to tie the flexible waterproof material and the exposed anchor rod firmly with silk or cotton strips , the end wrapped by the anchor rod is sealed with an expanded rubber sealing ring; the fourth step is to use spray film waterproof construction, so that the surrounding rock excavation surface is divided into sprayed reinforced concrete layer, mortar leveling layer, flexible waterproof material layer, Spray film waterproof layer, the end of the anchor rod goes out of the spray film waterproof layer. The invention solves the problem of waterproof treatment for bolts passing densely through the lining in a large area, avoids the failure of the waterproof layer of the tunnel lining, simplifies the process, and improves the structural strength of the main body of the tunnel supported by the bolts.

Description

technical field [0001] The invention belongs to the technical field of waterproofing of construction engineering, and in particular relates to a node treatment method for bolts to pass through a lining waterproof layer intensively in a large range, and is especially suitable for waterproof treatment in super-large-span tunnels. Background technique [0002] At present, waterproofing boards and buffer layers are often laid between the initial lining and the inner lining in composite lining tunnels for waterproofing. Such waterproofing systems have the following shortcomings: (1) The waterproofing board itself cannot be closely attached to the concrete, and the impact and back 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 the secondary lining is poured, the waterproof board will be subjected to a large tensile force, which will become thinner or even damaged lo...

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.

Images