Groove-pipe combined exhaust technology for joint grouting for normal concrete arch dam

Abstract

The invention discloses a groove-pipe combined exhaust technology for joint grouting for a normal concrete arch dam. An exhaust system adopted in the technology comprises a triangular exhaust groove, an exhaust main pipe, exhaust holes, hole sealing kraft paper, exhaust pipes and groove sealing galvanized sheet iron. The implementation process mainly comprises the steps as follows: forming the triangular exhaust groove on the side surface of a concrete pre-cast block; punching holes on the exhaust main pipe at equal intervals in a stagger manner; sealing the holes with the hole sealing kraft paper; mounting the exhaust main pipe before casting a post-cast block; connecting the exhaust main pipe with the exhaust pipes through elbows; and sealing the mouth of the exhaust groove with the galvanized sheet iron after the exhaust pipes are mounted, so as to form the pipe-groove combined exhaust system. The invention has the advantages as follows: the construction is simple, convenient and practicable and has higher reliability; and compared with other exhaust technologies, the groove-pipe combined exhaust technology can effectively prevent blockage of an exhaust pipeline system in the joint grouting arrangement of the arch dam in the concrete casting process.

Description

technical field [0001] The invention relates to a normal concrete arch dam joint grouting exhaust technology in water conservancy and hydropower projects—the exhaust technology combined with grooves and pipes. Novel technology for clogging. Background technique [0002] According to the requirements of temperature control and anti-cracking and concrete construction strength, concrete arch dams must be equipped with transverse joints, and those with large thickness must be equipped with longitudinal joints. To ensure the safe operation of the dam and the power station, the joint grouting system of each joint of the arch dam consists of an inlet and return grout system and an exhaust system. [0003] At present, there are many designs and construction techniques for the joint grouting exhaust system of normal concrete arch dams in water conservancy and hydropower projects. Gas and tee pipes, etc., due to the easy-flowing characteristics of the concrete itself and the disturb...

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Problems solved by technology

[0003] At present, there are many designs and construction techniques for the joint grouting exhaust system of normal concrete arch dams in water conservancy and hydropower projects. Gas and tee pipes, etc., due to the easy-flowing characteristics of the concrete itself and the disturbance of construction vibration, the exhaust system is often blocked, resulting in the blockage of the irrigation area during the later joint grouting construction, which needs to be dealt with by other measures such as drilling from the outside of the dam. Affect the quality of joint grouting and bring inconvenience to construction

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