| 摘要 |
A chemical fluids injection device for improvements in the ground includes an outer pipe, for injecting fluid-A of two-fluids for improvements in the ground, and an inner pipe, for injecting fluid-B of the two chemical fluids, which are coaxially disposed. An annular recess is located on the outer circumference of the outer pipe, and the annular recess is in communication with a space located between the outer and inner pipes and a space located within the inner pipe, respectively, through a fluid-A injection port and a fluid-B injection port, respectively. There is a resilient annular member made of rubber or the like which is located in the annular recess.
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