A grid lining structure for tunnels and its installation method
A network frame and tunnel technology, which is applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problems that the steel arch is not easy to be locally strengthened, the lateral stiffness of the steel arch is low, and the plane of the weak axis is twisted and unstable, so as to prevent The effect of destabilizing the pressure bar, improving the stability of the rock mass, and saving support costs
Active Publication Date: 2018-03-27
CHINA THREE GORGES UNIV
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Problems solved by technology
[0002] With the advancement of construction technology, although the technology of supporting surrounding rock with steel arches is becoming more and more perfect, steel arches are prone to weak-axis plane distortion and instability due to low lateral stiffness, which threatens the safety of the tunnel; and the surrounding rock is not stable. Potential safety hazards caused by large differences in the axial force and bending moment borne by different parts of the steel arch during uniform deformation
Due to the unevenness of the force, the steel arch itself is not easy to be locally strengthened, and it is not economical to increase the number and distribution density of the steel arch to maintain the stability of the rock mass
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[0027] As shown in the figure, a grid lining structure for a tunnel includes a grid 2, the grid 2 is composed of an inner chord 4, an outer chord 5 and a web 3, and the outer chord 5 and the inner chord 4 form two two mesh surfaces, connected by web bars 3 between the two mesh surfaces;
[0028] The grid frame 2 is arched, and the outer chord 5 is in contact with the surrounding rock.
[0029] In a preferred solution, the network frame 2 is composed of a plurality of quadrangular pyramid units, the bottom surface of the quadrangular pyramid is the outer chord 5 , the four edges are the webs 3 , and the vertices of the quadrangular pyramid are connected by the inner chord 4 .
[0030] In a preferred solution, pressure bars 7 are also provided on both sides of the grid frame 2 .
[0031] In a preferred solution, the pressure rod 7 is a hollow steel pipe, and the pressure rod 7 is filled with expansive concrete 6 .
[0032] In a preferred solution, the 2 legs of the grid frame ...
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A network frame lining structure for tunnels, including a network frame, the network frame is composed of inner chords, outer chords and webs, the outer chords and inner chords form two mesh surfaces, and the two mesh surfaces are separated by The web is connected; the outer chord is in contact with the surrounding rock. There are pressing bars on both sides of the net frame. The compression rod is filled with expansive concrete. A method for installing a network frame lining structure for a tunnel, comprising the following steps: 1) Excavating the tunnel according to actual construction requirements. 2) Initially spray a 30mm concrete layer on the surrounding rock wall of the tunnel after excavation. 3) Install the network frame, and fill the expansive concrete on the compression bars on both sides of the network frame. 4) The second anchor bolt passes through the grid frame foot and the steel plate to fix the grid frame on the ground, and fixes the right-angle steel plate at the corner of the frame foot and the steel plate through the first anchor bolt. 5) Spray concrete again on the grid frame after installation to complete the second lining. By adopting the above-mentioned structure, the safety and stability of the supporting structure in the tunnel are improved, and the construction cost is saved at the same time.
Description
technical field [0001] The invention relates to the field of tunnel lining construction, in particular to a grid lining structure for tunnels and an installation method thereof. Background technique [0002] With the advancement of construction technology, although the technology of supporting surrounding rock with steel arches is becoming more and more perfect, steel arches are prone to weak-axis plane distortion and instability due to low lateral stiffness, which threatens the safety of the tunnel; and the surrounding rock is not stable. During uniform deformation, the axial force and bending moment borne by different parts of the steel arch frame are quite different, causing potential safety hazards. Due to the inhomogeneity of the force, the steel arch itself is not easy to be locally strengthened, and it is not economical to increase the number and distribution density of steel arches to maintain the stability of the rock mass. Contents of the invention [0003] The ...
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IPC IPC(8): E21D11/00E21D11/14
Inventor 刘杰颜溧洲李学伟邓源李建林苑腾飞于振民
Owner CHINA THREE GORGES UNIV
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