Restoration Method of Existing Railway Line Tunnel Foundation Drainage Anchor Grouting

Abstract

The invention discloses a method for repairing drainage, anchoring and grouting at the base of an existing railway line tunnel. section; on the first side and the second side, a number of drainage holes are equally spaced at the two lining surfaces; on the bottom surface, a number of bonding holes and a number of anchor holes are applied at intervals along the longitudinal direction of the section to be treated, and each The row of bonding holes includes at least four bonding holes arranged along the transverse direction of the section to be repaired, and each row of anchor holes includes four anchor holes arranged on both sides of the two rails along the transverse direction of the section to be repaired; Grout into each bonded hole with a grouting pressure of 0.01-0.03 MPa; insert anchor rods and grouting core pipes into each anchor hole to the bottom of the hole in turn, and grout with a grouting pressure of 0.01-0.03 MPa After grouting and sealing, install backing plate and nut on the top of the anchor rod for anchoring.

Description

technical field [0001] The invention relates to a repair method, in particular to a repair method for the existing railway line base. Background technique [0002] In the process of continuous increase in the traffic volume and operating speed of railway lines, the ballast slab located at the base of the tunnel is affected by many factors such as long-term temperature difference, groundwater and repeated dynamic loads of trains, and the ballast slab and some water-rich and weak areas at the bottom of the tunnel Defects such as cracking of the track bed slab and settlement of the tunnel bottom are prone to occur. In addition, when heavy rain disasters occur, the underground water level in the tunnel often rises, and the increased water pressure causes the track bed slab to rise, which seriously affects the operation safety of the train. Therefore, in this case, it is necessary to repair the existing line base of the tunnel. [0003] At present, the repair measures for the ex...

AI Technical Summary

Problems solved by technology

However, this invention still has the following disadvantages or deficiencies: (1), there is no disclosure of the process of drawing groundwater from the bottom of the tunnel; (2), it is necessary to use hollow anchor rods connected with grouting joints, which increases the construction cost

However, this invention still has the following disadvantages or deficiencies: (1), it only drains the water in the damaged ditch through the channel, so that there is no water in the diseased area, and does not drain and depressurize the surrounding rock of the tunnel. There is a potential safety hazard of the lifting of the track bed; (2), the length of the steel plate inserted between the track bed and the bottom plate is difficult to achieve a firm combination between the track bed and the bottom; (3), drilling at the position in the side ditch Hole grouting, the grout is difficult to fill the gap between the tunnel floor and the surrounding rock, and it is easy to form an underground water flow channel; (4), the process of single anchorage first and then grouting is easy to cause deformation of the tunnel bottom

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