Construction verification device for ground improvement bodies and its installation method

Abstract

We provide a construction verification device for ground improvement structures that allows for real-time confirmation of the improved structure. [Solution] This is a construction confirmation device 1 for a ground improvement body 7, which creates a ground improvement body 7 by high-pressure injection of a solidifying agent 4 from an injection pipe 3 inserted into the ground 2 around the injection pipe 3, and mixing the high-pressure injected solidifying agent 4 with the ground 2 to form an improved material 6. An inner pipe 9 is buried at a predetermined position away from the injection pipe 3, and multiple detection units 15 of an electrical resistance type sensor 11 for detecting the improved material 6 are provided in the inner pipe 9 at intervals along the length of the inner pipe 9. When the improved material 6 comes into contact with a detection unit 15, the electrical resistance value changes, and this change in electrical resistance value allows detection that the improved material 6 has reached a predetermined position away from the injection pipe 3. Furthermore, the height of the detection unit 15 that the improved material 6 has reached can be detected in real time by the multiple detection units 15.

Claims

1. In a ground improvement construction verification device that uses a spray pipe inserted into the ground to spray a solidifying agent at high pressure around the spray pipe, and then uses the improved material formed by mixing the high-pressure sprayed solidifying agent with the ground to create a ground improvement body, A ground improvement construction confirmation device characterized in that a pipe is buried at a predetermined position away from the injection pipe, and multiple detection units of an electrical resistance type sensor for detecting the improved ground material are provided on the pipe at intervals along the length of the pipe.

2. The construction confirmation device for a ground improvement body according to claim 1, characterized in that an outer pipe is buried at a predetermined position away from the injection pipe, the pipe body is provided inside the outer pipe, and a hole is provided in the outer pipe corresponding to the detection unit.

3. The construction confirmation device for a ground improvement body according to claim 2, characterized in that a water-stopping member is placed between the upper and lower detection units between the inner circumferential surface of the outer pipe and the outer circumferential surface of the pipe body.

4. A method for installing a construction confirmation device for a ground improvement body according to claim 2, The aforementioned pipe body is formed by connecting a plurality of divided inner pipes, A connecting step is to form an excavation hole in the ground into which the outer pipe is loosely inserted, insert the outer pipe into the excavation hole, and then connect the ends of the divided inner pipes on the outside of the outer pipe, A sensor mounting step involves attaching the electrical resistance type sensor to the outer circumference of the connected upper and lower divided inner tubes in a continuous manner to the upper and lower divided inner tubes. A water-stopping member installation step involves attaching a water-stopping member to the outer circumference of the divided inner pipe between the upper and lower detection units, which seals the gap between the outer pipe and the divided inner pipe. A method for installing a construction confirmation device for a ground improvement body, characterized by comprising an inner pipe insertion step of inserting the connected divided inner pipes into the outer pipe so as to insert the water-stopping member into the outer pipe.

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