| 摘要 |
PROBLEM TO BE SOLVED: To make pumping efficiency good by providing a valve body comprising an elastic body and providing a slit penetrated in the thickness direction on the connection part of a concrete pumping passage and a concrete set accelerating agent pumping passage. SOLUTION: A concrete pump is operated to pump concrete to a main pumping pipe, and a set accelerating agent pump is operated to pump a concrete set accelerating agent Q to a set accelerating agent pumping pipe 20. The set accelerating agent Q is pumped in the inner pipe 11 of a set accelerating agent addition nozzle 10 set on the connection part of the main pumping pipe and the set accelerating agent pumping pipe 20. A valve body 14 is deformed in the direction of the set accelerating agent pumping by the set accelerating agent Q jetted from the inner pipe 11, a slit S is enlarged to open a valve, and the set accelerating agent Q is added to concrete in the main pumping pipe. Concrete is jetted from the spray nozzle of the edge of the main pumping pipe to be sprayed on an object face. Furthermore, when the set accelerating agent Q is not pumped, the slit S is restored to be closed so as to close the valve. Thereby pumping efficiency can be made good.
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