Construction technology for allowing tunnel to pass through ultra-large karst cave
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A kind of construction technology and super-large technology, which is applied in the construction technology field of tunnel passing through karst caves, can solve problems such as lack of technical means and measures, and achieve the effect of eliminating potential safety hazards, controlling construction costs and obvious economic benefits.
Active Publication Date: 2012-03-21
CCCC SHEC DONGMENG ENG CO LTD
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[0003] Relevant literature introduction In domestic highway construction, there are cases where tunnels pass through karst caves, but it is extremely rare to encounter super-large karst caves in tunnel construction, and the existing literature only conducts preliminary discussions on the treatment plan and construction technology of super-large karst caves and research, there is no specific technical means and measures
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Embodiment 1
[0030] Such as figure 1 As shown in the figure, the construction process of the tunnel passing through the super-large karst cave includes the following steps:
[0031] 1) The underground part of the karst cave is treated with a simple bridge: the tunnel passes through the karst cave, and a simple bridge is built in the karst cave, which is treated with a pile foundation; and a steel-concrete structure cap is poured on the pile foundation as a whole, so that the lower part forms a whole; digging piles into holes;
[0032] 2) Initial support, support wall is set on one side of the karst cave: the support wall is fully penetrated into the upper rock mass on the side of the karst cave. The initial support forms an integral support structure; the part above the tunnel outline is constructed with anchor rods on the wall of the cave, and 1m is reserved to connect with the support wall as a whole;
[0033] 3) Set up parallel pilot tunnels: Excavate the main tunnel while processing ...
Embodiment 2
[0041] 1) Determine the treatment plan for tunnels passing through super-large karst caves.
[0042] A. The underground part of the cave is treated with a simple bridge.
[0043] The tunnel passes through the karst cave, and a simple bridge is built in the karst cave, which is treated with pile foundation. Due to the limited terrain, the pile foundation can only be excavated manually to form holes, and the steel-concrete structure cap is poured on the pile foundation as a whole, so that the lower part forms a whole, the structure is firm and reasonable, and the stability of the lower structure is ensured.
[0044] B. Improve the initial support, and set up a supporting wall on one side of the cave.
[0045] The design and construction of the karst cave treatment adopt the principle of the new Austrian method, and give full play to the role of the supporting wall: on the one hand, the supporting wall is fully penetrated into the upper rock mass on the side of the karst cave, a...
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Abstract
The invention relates to a construction technology for allowing a tunnel to pass through a karst cave, and in particular relates to a construction technology for allowing a tunnel to pass through an ultra-large karst cave. The technology at least comprises the following steps of: 1) performing simple bridge treatment on the underground part of the karst cave; 2) performing primary support, namelyarranging a support wall at one side of the karst cave; 3) forming parallel guide holes; 4) performing bottom treatment; 5) treating the tunnel hole body at the inlet section of the karst cave; 6) filling C25 early strength sprayed concrete within 1 meter at the top of the support wall, and arranging phi 50 small grouting conduits with the lengths of 3 meters in the concrete, wherein the distancebetween the small conduits is 1.5 meters; 7) supporting the arch part and the side wall surrounding rock of the karst cave by adopting phi 22 cartridge anchor rods arranged in a plum blossom shape and at a distance of 150cm*150cm, hanging phi6 reinforcing meshes at a distance of 15cm*15cm, and spraying C25 early strength concrete with the thickness of 15 centimeters; 8) treating the accumulation of the karst cave; and 9) monitoring and measuring when the tunnel passes through the ultra-large karst cave. The construction technology for allowing the tunnel to pass through the ultra-large karst cave is simple in process, convenient for construction, low in cost, scientific, effective, energy-saving and environmentally-friendly.
Description
technical field [0001] The invention relates to a construction technology for a tunnel passing through a karst cave, in particular to a construction technology for a tunnel passing through an extra-large karst cave. Background technique [0002] With the economic development of the Pearl River Delta, the traffic pressure leading to the mainland is increasing day by day, and it is imperative to upgrade the highways in northern Guangdong. Since northern Guangdong is located in a complex geological structure belt, with developed folds and fractures and complex geological structures, it is the main unfavorable geology for highway construction. Therefore, after tunnel excavation, the impact of unfavorable geological conditions, foundation treatment, and support shall be investigated, observed, and analyzed. It is very necessary to take practical and effective construction measures to improve the quality of the project, speed up the progress, ensure safety, and ensure the effectiv...
Claims
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