Construction technology of grouting back of expansion joint

Abstract

The invention relates to a construction technology of grouting the back of an expansion joint. The construction technology specially comprises the following steps of first step, performing detection:detecting the armoring situation of the inner part of a tunnel shield concrete reinforced pipe, and marking the positions of inner reinforcing bars on the surface of the tunnel shield concrete reinforced pipe; second step, performing drilling: performing drilling to obtain a grouting hole and an exhaust hole in the 12'o clock positions of the tunnel shield concrete reinforced pipe; third step, mounting a grouting pipe and an exhaust pipe; and fourth step, performing grouting: injecting cement grout into the expansion joint, after the cement grout is drained from the exhaust pipe, sealing the exhaust pipe, controlling the grouting pressure to be 0.3MPa-0.5MPa, when grout in a grout bin of a grouting machine does not fall down within 15 minutes, stopping grouting, finally, separating the grouting machine from an unidirectional check grouting pipe, and completing the grouting. The construction technology has the advantages that grouting can be performed on the back of a water stopping pipe in the expansion joint, so that the expansion joint without a water leakage condition can be subjected to waterproof prevention, and the expansion joint cannot cause the situation of water seeping within a short term.

Description

technical field [0001] The invention relates to the technical field of repairing expansion joints, in particular to a construction technique for back grouting of expansion joints. Background technique [0002] my country is the country with the most tunnels in the world. In the past, the construction standards were low, and water leakage was common after the tunnels were completed. At present, my country's tunnel construction standards have been greatly improved, and the waterproof and drainage technology has also made great progress, but there is still a considerable gap compared with the international advanced level. [0003] refer to figure 1 , is the cross-sectional view of the existing water delivery tunnel, including the butt-connected shield reinforced concrete pipe 1 and the metal waterstop 2 reserved between the adjacent shield reinforced concrete pipes 1, wherein the metal waterstop 2 Copper waterstops are often used. One side located in the front of the metal w...

AI Technical Summary

Problems solved by technology

However, for expansion joints that have not yet leaked, it is necessary to strengthen the waterproofing of the expansion joints. If no preventive treatment is done, water leakage may occur in a short period of time. If the expansion joints leak and are repaired, it is a It is easy to cause great economic losses

[0005] For expansion joints that have not yet leaked, if the sealing filler 3 and the metal water stop 2 are disassembled and re-constructed, it will cause a waste of resources and the cost is high. Grouting to the back of the metal water stop to form a waterproof barrier to enhance the waterproof ability of the tunnel expansion joint, but since the part behind the metal water stop in the expansion joint is hidden behind the metal water stop, how to back grout the expansion joint is an urgent matter to consider

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