Excavation construction method for ultra-hard rock tunnel through hydraulic dilling matched with hydraulic splitting
A construction method and tunnel excavation technology, which is applied to tunnels, earthwork drilling, mining equipment, etc., can solve problems such as high construction cost, low tunnel excavation efficiency, and large impact on surrounding buildings and structures, and improve construction efficiency. Improve work efficiency, reduce construction risk, and increase tunneling speed
Inactive Publication Date: 2019-05-10
CHINA RAILWAY NO 3 GRP CO LTD +1
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[0003] In order to solve the problems of ultra-hard rock, ultra-shallow burial, low excavation efficiency, high construction cost, and great impact on surrounding buildings and structures, the invention proposes a super-hard rock tunnel Construction method of water drilling combined with hydraulic splitting excavation
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[0019] The construction principle of the present invention is: water drilling + hydraulic splitting to excavate the upper section, and rock cutting saw to excavate the lower section. Tunnel excavation is carried out by the method of "cutting the lower section surface by section drawing groove". Water-milling drills are used to drill and core horizontally along the excavation contour in an adjacent circle, forming continuous channels around the periphery to provide a free surface for the excavation of the upper section rock mass. In the rock mass excavation area of the upper section, the pneumatic drill is used to drill splitting holes in the horizontal direction at a certain interval, and the rock mass is split from the periphery to the inside with a hydraulic splitting machine using the free surface formed by the excavation of the surrounding channels. After the excavation of the upper section is completed, the rock mass of the lower section is excavated using a rock cutter...
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The invention belongs to the technical field of construction of overline large bridges, and provides an excavation construction method for an ultra-shallow-buried hard rock tunnel penetrating througha sensitive building area in order to solve the problems that an existing side span cast-in-place section and an existing closure section are large in interference with a business line, high in construction risk and the like. The overline bridge beam is constructed by adopting a construction method of using a parallel line direction cantilever method or a bracket cast-in-place method to pour a beam body and then conducting rotating in place. A conventional rotating body is cancelled and a side span cast-in-place section and a closure section are arranged, so that the problem of high construction risk above the line or adjacent to an existing line is avoided; and before the beam body rotates, the whole beam body is poured with a support, a side pier is provided with high and low bearing platforms, pouring construction is carried out after the high bearing platform and the like rotate in place, pouring of the low bearing platform is completed before rotation construction, but pouring construction is conducted after support cushion stone rotates in place, so that with the construction method ,the problems that construction is conducted above an existing line or adjacent to the existing line are solved, the operation safety of a business line is guaranteed, the construction risk is reduced, the construction safety is guaranteed, and the construction efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an excavation construction method for an ultra-shallow tunnel passing through a hard rock tunnel in a sensitive building area. Background technique [0002] With the rapid development of urban rail transit, the construction of rock tunnels is increasing day by day, and complex construction conditions are constantly emerging, which puts forward higher requirements for construction technology. At present, it is aimed at the construction of ultra-shallow tunnels and tunnels passing through sensitive buildings and areas close to important buildings. , has high requirements for disturbance and vibration, blasting construction is not allowed, and there is still no good construction method for ultra-hard rock tunnel excavation. The disturbance to the surrounding rock is minimized, the tunneling speed is increased, the construction efficiency is improved, and the ...
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IPC IPC(8): E21D9/10
Inventor 孙中华李鹏翱李彩红李傲龙孙伯乐郝鑫
Owner CHINA RAILWAY NO 3 GRP CO LTD
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