Abrégé

The present method is a ground improvement method with which a ground improvement body is constructed by mixing soil with cement slurry to which a water-soluble fluorescent dye at a predetermined concentration is added, the method comprising: a first step of irradiating the ground improvement body with black light from a light source; a second step of measuring the ground improvement body irradiated with the black light by the light source using a measurement device; and a third step of comparing an emission rate obtained based on the data output by the measurement device with a predetermined threshold value and determining whether the mixed state of the cement slurry is acceptable.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
• E02D 1/00 - Étude des sols de fondation sur place

Abrégé

The present method is a ground improvement method in which a ground improvement body 30 is constructed by mixing cement slurry 26 to which a water-soluble fluorescent dye at a predetermined concentration is added and soil S, the method comprising: a first step of irradiating the ground improvement body 30 with black light from a light source 6; a second step of measuring the ground improvement body 30 irradiated with the black light by the light source 6 using a camera 7a; and a third step of comparing a calculated value based on the data output by the camera 7a with a predetermined threshold value and determining whether or not the cement slurry is in a mixed state.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores

Abrégé

The present invention is an excavation and agitation device that discharges, to the ground, a cement slurry to which a water-soluble fluorescent dye of a prescribed concentration has been added, the device comprising: a rotating shaft 3 that rotates in the ground about a vertical axis; an excavation blade 5 that is axially attached to the rotating shaft 3 and excavates soil; a light source 6 that radiates black light onto a soil improvement body in the ground; and a measuring apparatus 7 that measures the soil improvement body irradiated with the black light from the light source 6, wherein the light source 6 and the measuring apparatus 7 are raised and lowered integrally with the excavation blade 5. The present invention is provided with a control unit 20 that derives a luminance rate on the basis of the output of the measuring apparatus 7, compares the derived luminance rate and a predetermined threshold, assesses whether a mixed state of the cement slurry is permissible or not, and when the mixed state is permissible, allows the excavation blade 5 to proceed.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores

Abrégé

This method involves: a first step for preparing cement slurry to which a water-soluble fluorescent dye is added; a second step for discharging the cement slurry from the base of a digging blade, digging surrounding dirt and mixing surrounding dirt and the discharged cement slurry, and forming an uncured soil improving body; a third step for irradiating, with black light from a light source provided to the digging blade, a soil improving body at a depth at which the digging blade is located inside the uncured soil improving body; and a fourth step for measuring, by a measuring device provided to the digging blade, the reflection of the black light at a depth at which the digging blade is located inside the uncured soil improving body.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores

Abrégé

This device comprises: drilling blades 2 which are mounted to a rotating shaft 1 to excavate earth, and which have a first diameter D1; and a co-rotation prevention blade having a boss part 3 loosely fitted to the rotation axis and having a second diameter D2. A conditional engagement part 30 is provided only on the upper side of the boss part 3. The conditional engagement part 30 engages the boss part 3 with the rotating shaft 1 when the rotating shaft 1 rotates in a first rotation direction, but does not engage the boss part 3 with the rotating shaft 1 when the rotating shaft rotates in a second rotation direction. If the condition that drag on the co-rotation prevention blade 5 acts on the upper side and the rotating shaft rotates in the first rotation direction is satisfied, the co-rotation prevention blade 5 rotates synchronously with the drilling blades 2 to configure an enlarged-diameter part 11 having the second diameter D2.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
• E02D 5/46 - Pieux en béton ou analogue coulés en place réalisés sur place par injection de liants dans des remblais graveleux ou dans le sol
• E02D 5/48 - Pieux de structure variable le long de leur longueur

Abrégé

Depths L1, L2, L3, L4, and L5 are set in this order, a group of first columns 11 extending from L1 to L3 and a group of second columns 11 extending from L2 to L4 are formed by a column construction machine rotating in a horizontal plane, and a slab body 20 is formed by a vertical slab construction machine rotating in a vertical direction. The slab body comprises a slab main body 21 extending from L4 to L5, and a beam part 22 extending from L4 to L3 immediately below the slab main body 21. The slab body 20 is configured to form a T-shape in a vertical cross-sectional view, and to have a plane improvement rate that decreases with increasing depth.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores

Abrégé

In the present invention, a first level L1 to a fourth level L4 are set in order from deepest to shallowest in ground 10 to be improved, and the first level L1 is variable. An improving body comprises: a short column 11 group that extends from the first level L1 to the second level L2 and that is formed by a column construction machine 30 rotating within a horizontal plane; and a slab 20 that is supported by the short column 11 group. The slab 20 comprises: a slab body 21 that is formed by a vertical slab construction machine 40 and that extends from the third level L3 to the fourth level L4; and a beam 22 that extends from the second level L2 to the third level L3 directly under the slab body 21. The slab 20 forms a T-shape in a vertical cross-section view, and the first level L1 is set to be deepest near a rigid body X and shallower further away from the rigid body X.

Classes IPC  ?

• E01C 3/04 - Fondations réalisées par stabilisation du sol
• E02D 3/00 - Amélioration ou conservation du sol ou de la roche, p. ex. conservation du permagel
• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores

Abrégé

A ground improvement body comprising: a group of short cylindrical columns 11 that are formed from a first level L1 to a second level L2 by a column construction machine 30 that rotates on a horizontal plane, where the first level L1, the second level L2, a third level L3, and a fourth level L4 are set in order from the deepest to the shallowest in soft ground; and a slab 20 that is supported by the group of short cylindrical columns 11. The slab 20 comprises: a slab body 21 that is formed by a vertical slab construction machine 40 that rotates in the vertical direction and that is formed from the third level L3 to the fourth level L4 by the vertical slab construction machine 40; and a beam 22 that is provided between the top 11b of the group of short cylindrical columns 11 and the bottom of the slab body 21. The slab demonstrates a T-shape in the perpendicular cross-sectional view.

Classes IPC  ?

• E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores