2. The net total width of the tunnel;
3. Clear height of tunnel;
4. Tunnel deviation;
5. Connection between the center line of approach road and the center line of tunnel;
6. Slope of side and back. Ordinary acceptance inspection items: 1, with empty lining;
2. Inverted arch thickness;
3. Lining thickness;
4, concrete strength;
5. Pull-out resistance of anchor rod. These are necessary tests. There are others, such as reinforcement spacing, concrete protective layer, pavement thickness, pavement width, conventional mechanical testing of reinforcement, conventional performance testing of cement concrete, seamless waterproof board, impermeability testing and so on.
Test method for detecting pull-out force of anchor rod in tunnel
1. According to the test purpose, drill anchor holes in the designated part of tunnel surrounding rock.
2. Install the anchor rod to be tested according to the normal installation process. Smooth the anchor hole with mortar to support the bearing pad.
3, according to the types of anchor and test purpose to determine the drawing time.
4. Add a pad to the tail of the anchor rod, put on a hollow jack, fix the outer end of the anchor rod with the inner cylinder of the jack, and install displacement measuring equipment and instruments.
5. Pressurize with a manual oil pump, read the oil pressure from the oil pressure table, and convert the drawing force of the anchor rod according to the piston area. Read the displacement of the bolt tail from the dial indicator as needed, and draw the tension-displacement curve of the bolt for analysis and research.
Matters needing attention of anchor rod puller:
1. When installing the drawing equipment, the jack should be concentric with the anchor rod to avoid eccentric tension.
2. The loading should be uniform, generally increasing at the rate of 10kN per minute. 3 If there is no special need, the destructive test can be omitted, and the loading can be stopped when the drawing reaches the design tension. 4 jack should be fixed firmly, and there are necessary safety protection measures.
Test requirements for anchor puller:
1. For every 300 anchors installed, at least one group (3 anchors) shall be randomly selected. When the design changes or the material changes, another group of pull-out force tests shall be conducted.
2. The average anchoring force or pulling force of the same group of anchors should be greater than or equal to the design value.
3. The anchoring force or pulling force of a single anchor in the same group should not be less than 90% of the design value.
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