Construction method for treating longitudinal non-through cracks on side face of tunnel section hole body
A construction method and a non-penetrating technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems affecting the quality of the main body, affecting the safety of the tunnel, and the effect of grouting treatment is not obvious
Inactive Publication Date: 2020-08-18
CHINA MCC17 GRP
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AI Technical Summary
Problems solved by technology
In the lava area of highway engineering, after the completion of tunnel construction, there is a phenomenon that vertical irregular cracks appear on the section of the tunnel body, generally between 2mm and 4mm, and some water droplets appear. After simple treatment, the effect of grouting treatment is not obvious Because the surrounding rocks in the lava area are mostly water seepage rock mass, and due to the change of water content in the upper part of the tunnel and the influence of seasons, different degrees of water will seep into the vault of the tunnel, and seep into the drainage of the tunnel through the outer side of the tunnel waterproof material However, due to the various quality factors of the drainage board and tunnel construction, sometimes it is inevitable that part of the water seeps into the back of the second lining, causing stress changes, or longitudinal cracks appear in the tunnel body due to concrete construction quality problems. While affecting the quality of the main body, it also affects the safety of the tunnel
Method used
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Experimental program
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Effect test
Embodiment 1
[0026] A construction method for treating longitudinal non-penetrating cracks on the side of the tunnel body in this embodiment, the steps are as follows:
[0027] Step 1: Measure the size of the tunnel crack and make statistics;
[0028] Step 2: Excavate tunnel cracks of 2 to 4 mm;
[0029] Step 3: When the crack is a non-penetrating crack, first stake out longitudinally along the position of the crack, generally 15cm-20cm wide and 5-8cm deep. The excavation zone includes all cracks, and the excavation surface is U-shaped;
[0030] Step 4: When dealing with non-penetrating cracks, the excavation surface is leveled, the depth of the chisel is controlled at 5-10mm, and the lower end is excavated all the way to the drainage ditch;
[0031] Step 5: After the excavation is completed, the surface is evenly sprayed with high-strength adhesive;
[0032] Step 6: When the high-strength adhesive achieves the bonding effect, place the drainage pipe, place the drainage eye along the mai...
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The invention discloses a construction method for treating longitudinal non-through cracks on the side face of a tunnel section hole body, and belongs to the technical field of tunnel construction. The method comprises the following steps: step 1: measuring the sizes of the tunnel cracks and carrying out statistics; step 2: carrying out chiseling treatment on the 2-4mm tunnel cracks; and step 3: when the cracks are non-through cracks, firstly laying out along the positions of the cracks, wherein the width is generally 15 cm-20 cm, the depth is 5-8 cm, a cutting zone contains all cracks, and the cutting surface is U-shaped. According to the construction method, the longitudinal non-through cracks on the side face of the tunnel hole body in the karst area are effectively treated, and a smallamount of seepage water on the back side of a tunnel backing is effectively discharged, so that the purpose of unified drainage is achieved. Through adoption of the treatment of cutting of the hole body, stress on the back of the tunnel backing is released, and the non-through cracks of a tunnel are solved fundamentally for guarding against future damage.
Description
technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for treating longitudinal non-penetrating cracks on the side of a tunnel body. Background technique [0002] Generally, there are many tunnel layouts in our Yunnan-Guizhou-Sichuan area. The grade of the tunnel cannot be determined according to the grade of the surrounding rock, and the difficulty of construction is also different. The grade of the tunnel design is closely related to the geological conditions of the survey, so the preliminary survey of the tunnel area is particularly important. At the same time, the monitoring and measurement of the tunnel during the construction process also directly affects the deformation of the surrounding rock of the tunnel on the operation quality of the tunnel during the tunnel construction and later operation. In general, after the tunnel is penetrated, due to the different frequency of survey, the influen...
Claims
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IPC IPC(8): E21D11/00E21D11/10E21F16/02
CPCE21D11/00E21D11/10E21F16/02
Inventor 金玲玲李军谢兰敏史纪申
Owner CHINA MCC17 GRP