The current management of the tunnel tunnel Water Leakage phenomenon has attracted enough attention, and now the popularization and application of new waterproof material and waterproof construction technology of highway tunnel waterproof technology has got rapid development, and achieved a better waterproof effect. In spite of this, there are still quite a few tunnels in a certain degree of leakage. The main reason for the occurrence of this disease is that the waterproof layer in the construction is not well or damaged, and the cracks in the surrounding rock are leaking from the cracks in the waterproof layer. The Mester waterproof Xiaobian for everyone to share and attention points during construction.
Waterproof construction scheme of tunnel waterproof and drainage measures including drainage tunnel lining; construction scheme; waterproof board construction joint waterproofing, waterproofing of tunnel is an important link of the construction of the tunnel project quality and operation process is complicated, the larger part of the difficulty of construction, people pay more attention to history. Therefore, the waterproof construction of each project tunnel should be based on this program and should be taken according to local hydrogeological conditions to adjust to local conditions, in order to row based, prevention, drainage, interception, blocking the combination of comprehensive management principles. To achieve a smooth drainage, waterproof, reliable, economical and reasonable construction scheme.
Waterproof board damage
As a very important waterproof barrier, in the laying of the waterproof board must ensure that the waterproof material can not be damaged. And the waterproof layer laying allowance is not enough, two lining concrete construction will crush the crack caused by waterproof board waterproof board Water Leakage infiltration.
In view of this phenomenon in the construction quality control need to pay attention to:
In 1, laying drainage material, the surface to remove the lining or Qi root resection protruding parts such as steel head, anchor top, and for the resection of the outcrop with mortar cover must eliminate the threat ofdestruction waterproof board.
2, strict control of the remaining amount to meet the two lining construction waterproof plate crack is crushed to eliminate the threat.
Two, joint water leakage problem
Due to the poor quality of the bonding or welding quality of the waterproof coiled material, the joint is not strict, and the leakage of the water is leaking. This kind of phenomenon is also often encountered in the actual construction, but also received a similar consultation, for this type of problem summed up a set of practical construction programs and solutions, mainly as follows:
1, waterproof coil lap and welding, lap length must be strictly controlled in the 10cm above, the width of the weld is not less than 2cm. The seam welding seam should be double welded seam and the cavity will be set aside for inflation, and the temperature should be strictly controlled to prevent the burning of the waterproof coiled material or the failure of the fixed plastic gasket.
2, such as the use of bonding, as far as possible the use of waterproof plate manufacturers of special adhesive, glue requires a high rate of consolidation, high bond strength.
3, waterproof board splicing is good, must by the quality inspection engineer to inspect the lap joints of the welding, bonding quality, after inspection to use. The strength of the waterproof layer and the welded joint shall not be less than the tensile strength and shear strength of the waterproof layer.
Sprayed concrete surface roughness have many small space waterproof materials can not stick
Because of the injection of concrete by the strong pressure into the surrounding rock consolidation, so the surface of the shotcrete is very rough, local presents "grape"". Two times of concrete filled with concrete in the flow, resulting in damage to the non-woven fabric and waterproof board. In view of this problem, it is necessary to pay attention to the quality control in Construction:
1, for the early part of the supporting surface irregularities exist, when the rise of chord length greater than 1 / / 6, to local leveling, smoothing.
2, for the spray layer of water seepage, should install transverse drainage blind ditch in water.
3, reduce the surface roughness of sprayed concrete
(1) the surface of shotcrete is used as coarse aggregate, and the surface is smooth and smooth by artificial or mechanical pressure before the initial setting of shotcrete.
(2) with mortar cover surface of sprayed concrete, waterproof layer paving surface smooth.
Four, suggestions
1, smooth blasting is the initial support waterproof foundation, smooth blasting can ensure the waterproof layer surface generally flat, and ensure the waterproof layer and the concrete surface density of posts, while ensuring that the relaxation of the waterproof layer reserved to achieve a reasonable control, can avoid the waterproof layer is punctured or crack.
2, the staff training, enhance the technical operation skills and quality awareness of staff. This is especially important, only employees proficient operating skills and maintain the quality consciousness, the height of the alarm bells ringing, in order to ensure the engineering quality.
3, waterproof project runs through the highway tunnel construction process. Approach from waterproof materials; technical disclosure; staff training; waterproof plate welding or bonding; waterproof layer plate hanging trolley design, installation and positioning; highway tunnel smooth blasting; initial support; surface inspection; hanging waterproof board; two lining concrete pouring process must be in strict accordance with the technical specifications, otherwise it will be caused by the rupture of the waterproof layer, so that the highway tunnel Water Leakage.