JP2017002464A5

JP2017002464A5 -

Info

Publication number: JP2017002464A5
Application number: JP2015113875A
Authority: JP
Filing date: 2015-06-04
Publication date: 2018-07-19
Anticipated expiration: 2035-06-04

Description

地盤中に固化材スラリーを噴射して地盤を切削すると共に固化材スラリーと改良対象土を混合攪拌して改良体を造成しながら改良体の改良半径を確認する装置は、固化材スラリーが噴射されるノズルを有する注入管が地盤に挿入される位置から、予め設定された設計改良半径だけ離れた位置において地盤に挿入するように設けられた１つまたは複数の到達管と、到達管に生じる加速度を検知する検知器と、検知器によって検知された加速度を記録する記録計とを備える。
固化材スラリーが噴射されるノズルを有する注入管が地盤に挿入される位置から、予め設定された設計改良半径だけ離れた位置以外において地盤に挿入するように設けられた少なくとも１つの別の到達管と、少なくとも１つの別の到達管に設けられ、少なくとも１つの別の到達管に生じる加速度を検知する検知器とをさらに備えてもよい。
到達管は注入管と同一の管状部材であってもよい。
検知器は、到達管または別の到達管の地盤よりも上方の位置に着脱自在に固定されてもよい。 The device that checks the radius of improvement of the improved body while injecting the solidified material slurry into the ground to cut the ground and mixing and stirring the solidified material slurry and the soil to be improved while checking the improved radius of the improved body. One or a plurality of arrival tubes provided to be inserted into the ground at a position separated by a predetermined design improvement radius from the position at which the injection tube having the nozzle is inserted into the ground, and acceleration generated in the arrival tube And a recorder for recording the acceleration detected by the detector.
At least one other access pipe provided to be inserted into the ground at a position other than the position where the injection pipe having the nozzle into which the solidifying material slurry is injected is inserted into the ground at a predetermined design improvement radius. And a detector that is provided in at least one other access tube and detects acceleration generated in the at least one other access tube.
The access tube may be the same tubular member as the injection tube.
The detector may be detachably fixed at a position above the ground of the arrival tube or another arrival tube.

Claims

A method of confirming the improved radius of the improved body while injecting the solidified material slurry into the ground to cut the ground and mixing and stirring the solidified material slurry and the improvement target soil,
A step of providing one or a plurality of reaching pipes in the ground at a position separated by a predetermined design improvement radius from a position at which the injection pipe having a nozzle for injecting the solidifying material slurry is inserted into the ground; When,
Providing the access tube with a detector for detecting acceleration generated in the access tube;
After inserting the injection tube into the ground, injecting the solidified material slurry from the nozzle while pulling up while rotating the injection tube;
Detecting the acceleration generated in the access tube while the injection tube is pulled up;
Determining whether the improvement radius of the improvement body being built has reached the design improvement radius based on the sensed acceleration.

When it is determined that the improvement radius of the improvement body under construction does not reach the design improvement radius, after stopping the injection of the solidified slurry and the pulling up of the injection pipe,
Inserting the injection tube into the ground again and injecting the solidified material slurry from the nozzle while pulling up the injection tube;
Detecting the acceleration of the reach tube while pulling up the injection tube;
The method according to claim 1, further comprising: determining whether the improvement radius of the improvement body being built has reached the design improvement radius based on the detected acceleration.

The detector detects the acceleration at a fixed detection time interval, and the fixed detection time interval is:
t = 30B / [π · (r + B / 2) · a]
An interval less than t expressed by
Here, B [m] is the width [m] of the arrival tube when the arrival tube is viewed from the injection tube, r [m] is the distance from the injection tube to the arrival tube, and a The method according to claim 1 or 2, wherein [rpm] is the number of rotations of the injection tube.

Providing at least one other reaching pipe in addition to a position away from a position where the injection pipe having the nozzle through which the solidifying material slurry is injected is inserted into the ground by a preset design improvement radius;
The method according to any one of claims 1 to 3, further comprising the step of providing the at least one other access tube with a detector that detects an acceleration generated in the at least one other access tube.

The method according to any one of claims 1 to 4, wherein the detector is detachably fixed at a position above the ground of the reaching pipe or the other reaching pipe.

A device for confirming the improved radius of the improved body while jetting the solidified material slurry into the ground to cut the ground and mixing and stirring the solidified material slurry and the soil to be improved while forming the improved body,
One or a plurality of reaching pipes provided to be inserted into the ground at a position separated from a position where the injection pipe having the nozzle for injecting the solidifying material slurry is inserted into the ground by a predetermined design improvement radius. When,
A detector for detecting acceleration generated in the access pipe;
And a recorder for recording the acceleration detected by the detector.

At least one other arrival provided to be inserted into the ground at a position other than the position where the injection pipe having the nozzle through which the solidifying material slurry is injected is inserted into the ground at a predetermined design improvement radius. Tube,
The apparatus according to claim 6, further comprising a detector provided in the at least one other access tube and detecting an acceleration generated in the at least one other access tube.

The device according to claim 6 or 7, wherein the access tube is the same tubular member as the injection tube.

The device according to any one of claims 6 to 8, wherein the detector is detachably fixed at a position above the ground of the reaching tube or the other reaching tube.