Combined support system for extremely broken surrounding rock tunnel and its construction method
A combined support and extremely broken technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as delays in smooth progress of projects, casualties of construction personnel, and difficulties in tunnel construction, so as to improve stability and support strength , to ensure long-term stable effect
Active Publication Date: 2022-07-22
CENT SOUTH UNIV
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Problems solved by technology
However, after the support of the upper surrounding rock is completed, when the lower section of the tunnel is excavated, the supporting structure of the upper surrounding rock cannot receive support from below, so that one end of the steel arch is in the air without force state, it is very easy to cause the upper surrounding rock and supporting structure to collapse together during the excavation of the lower section of the tunnel.
Such engineering problems are very common on site, not only delaying the smooth progress of the project, but also easily causing casualties to construction personnel, so it has become a major problem in the construction of tunnels in V-type rock mass areas such as extremely broken surrounding rock
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[0040] In the present invention, unless otherwise stated, the orientation or positional relationship indicated by the orientation words such as "up, down, left, right, front, rear, inside, outside" is based on the polarities of the present invention. The azimuth or position relationship of the broken surrounding rock tunnel joint support system in the actual use state. Among them, the driving direction of the tunnel during construction is "front", and the point near the center of the tunnel section is "inside". The description of the orientation or positional relationship of the devices or components of the extremely fragmented surrounding rock tunnel combined support system of the present invention is consistent with the actual state of use in the support system.
[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For ex...
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The invention relates to tunnel support, and discloses a combined support system for extremely broken surrounding rock tunnels, comprising a dome support part, a temporary support part, a side wall support part, a bottom support part and a secondary support structure; the dome support part It includes interconnected steel arches, top bolts and reinforced beams, which are anchored in the surrounding rock at the top of the tunnel; the temporary support includes support columns, auxiliary support columns and steel sleepers, which can form temporary support for the vault support; sidewall supports The bottom part includes left and right steel frames, side walls, and bottom anchor rods, which can be fixed on the left and right sides of the tunnel and form support for the dome support part; the bottom support part includes left and right bottom plates and bottom anchor rods, which can be anchored in The bottom of the tunnel; the secondary support structure includes reinforced mesh and concrete layers, which are set on the inner side of the previous support structure to form an integrated joint support. The invention also provides a construction method of the support system, which can perform support step by step in the tunnel construction process, has high support strength and is convenient for construction.
Description
technical field [0001] The invention relates to tunnel support, in particular to a combined support system for extremely broken surrounding rock tunnels. The invention also relates to a construction method of a combined support system for an extremely broken surrounding rock tunnel. Background technique [0002] With the continuous advancement of my country's urban transportation construction and transportation development strategy, "underground space development and utilization" is an important subject for future strategic development, and more and more tunnel engineering projects have been undertaken. Inevitably, underground tunnels frequently encounter V-type rock masses such as extremely broken, soft strata, and geological structural belts, and the compressive strength and structural stability of such rock masses are extremely low, making it difficult to form an effective support for the tunnel surrounding rock. , it needs continuous and efficient artificial support for...
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IPC IPC(8): E21D11/18E21D11/15E21D11/10E21D11/12E21D21/00E21D20/00
CPCE21D11/18E21D11/152E21D11/105E21D11/12E21D21/0026E21D20/00
Inventor 李地元杜少华阮波彭述权
Owner CENT SOUTH UNIV