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Several Opinions on Further Strengthening the tunnel project quality and safety supervision work
浏览次数: 日期:2014-10-23 16:31:58

Provinces, autonomous regions and municipalities directly under the central government, xinjiang production and construction corps transportation department (bureau), the commission, the tianjin municipal highway administration, Beijing road politics:

In recent years, our country highway tunnel project construction achievements significantly, successively built mount zhongnan qinling tunnel, xiamen xiang 'an undersea tunnel, a large number of Shanghai Yangtze river tunnel road tunnel engineering.At present, along with our country highway construction focus gradually shift to the central and western regions, the tunnel engineering quantity increasing, the highway tunnel under construction are the only reached more than 160 buildings, construction task more difficult, more and more complicated geological conditions, engineering management difficulty increases obviously, the quality and safety management work faces severe challenges.

Closed tunnel engineering construction environment, take cover engineering, engineering quality safety hazard prone is hard to control.Parts and project tunnel engineering geological investigation is unknown, inadequate design;The construction management system is not sound, not implementation, management in place;Lack of site construction organization, poor equipment, backward technology, prohibition brutal construction, the phenomenon such as corners;The absence of construction management and on-site supervision, take cover engineering quality control is weak, quality and structure durability is affected by the project.For truly standardize tunnel construction quality and safety management, to improve engineering quality and safety management level, put forward the following opinions:

First, strengthen tunnel engineering technical safeguards

(1) promote the standardized construction of tunnel engineering.Using the modern project management techniques and methods, from the strengthening design and construction methods, construction organization, process, such as standardization, regulating the behavior of the tunnel construction main link quality management;Stick to adjust measures to local conditions, implement the tunnel construction steel processing, concrete mixing, prefabricated component template "three concentrations" and lining, two car "two access" management, improving the quality of tunnel engineering support capability.

(2) promote the informatization construction of tunnel engineering.In view of the uncertainty and high risk of tunnel construction, strengthen the construction of information system construction, the surrounding rock and supporting structure monitoring information, personnel positioning and safety management informatization, informatization construction quality management, timely and effective guidance and control construction, reduce the quality safety risk.Configuration video system, visual monitoring all engineering construction management.Establish concealed engineering construction process, photos, video record database to ensure traceability in the operation process, can be found out.Grew up in the tunnel appropriate configuration electronic entrance guard, toxic or harmful gases continuous monitoring information management system.

(3) strengthen the advanced prediction in tunnel construction and monitoring measurement.Of bad geological tunnel geological advanced prediction, dynamic evaluation should be strengthened and the construction monitoring and quality inspection, unified choose to have the corresponding ability level of independent inspection agency, strengthen the data exchange, result analysis and guide the construction.Of karst, rich water, gas, hydrogen sulfide, carbon dioxide gas evolution, through the coal seam and gob or have faults, fracture zone, should advance forecast review, on the basis of horizontal drilling abnormal situation must adjust the work plan, strengthen the precautionary measures.

(4) widely used in tunnel construction of the new machinery.The ability of the construction unit should improve project quality guarantee, guide and encourage the construction unit to enhance the level of tunnel construction and equipment, improve the construction conditions, reduce labor intensity, reduce artificial deviation.The active adoption of large-scale, professional tunnel engineering construction equipment, such as shield, jumbo, walking hydraulic automatic lining shutter and the bolt hole, concrete spraying equipment, etc.

(5) strengthen the quality and safety of tunnel engineering major construction process control.

1. Strict controls of quality and safety of the excavation process.Combined with the actual tunnel engineering, scientific and reasonable to determine the excavation scheme, reduce the overbreak and excessive disturbance of surrounding rock.To optimize the design of the drilling and blasting, to improve blasting effect, it is forbidden to secondary blasting.Loading and unloading registration system, strict enforcement of explosives and detonator hole should be necessary safety warning signs, to ensure that the vehicles and personnel safety.

2. Specification at the beginning of construction.Early to dynamic perfect solution, timely reinforcement, the weak surrounding rock at the beginning of the constraints must be followed.Arch of anchor drill up into a hole, should be adopted to ensure drilling depth and perspective.Bolt and plate construction should meet the design requirements, as far as possible choose pattern bolt to be truncated.Steel arch spray and surrounding rock or early surface dense paste, install a smooth, solid foundation, arch foot foot bolt lock set shall comply with the design.Sprayed concrete wet spraying technology should be adopted to ensure strength, thickness and uniformity, it is strictly prohibited to dry spray.

3. The specification inverted arch construction.Inverted arch construction must be in strict accordance with the design of excavation in place, remove slag, impurities and water.Basal overexcavation part must use the same grade concrete or flaky concrete backfill, slag hole must not be used as backfill.Whole section once inverted arch pouring shape.

4. The specification is waterproof and two lining construction.Waterproof board should be bottom-up annular laid, norms, should be equipped with a dedicated car when necessary;Check hose installation specification, prevent deviation, broken.Reasonable control of second lining and constraints spacing;In accordance with the design for steel construction, it is forbidden to cut corners;Using integral lining shutter and concrete pumping operations;Cars should be equipped with maintenance nozzle and the hole hole, and sprinkling water period of concrete curing time should be not less than 7 days and 14 days respectively, it is forbidden to dismantle strength is lower than the design and specification requirements.Widened section of the second line should be timely construction, if necessary, shall be provided with widening type integral lining shutter.Short wall and the second line should be at the same time casting.

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