Abstract

A bag body 10 is filled with a stone material 12. If the diameter of the bag body 10 is W, the length of a restraining rope 14 from a bottom part of the bag body 10 through the center thereof to a root position of a suspension rope 15 for the bag body 10 is H1, the restraining rope 14 penetrating through the center of the bag body 10 from the bottom part thereof to be lifted up together with the suspension rope 15, and the diameter of a bag material 11 filled with a stone material 12 is W0, then W/H1 (diameter/restraining rope length) lies within a predetermined vertical range centered on a curve expressed by W/H1 = 15.898 × (W/W0)2 − 17.784 × (W/W0) + 6.6314.

IPC Classes  ?

• E02B 3/08 - Structures of loose stones with or without piles

Abstract

A ground improvement apparatus includes: an irrotational sun gear fixed to an irrotational inner pipe inside a rotatable outer pipe; a planetary gear rotatably supported on a rotatable agitation shaft and configured to rotate while meshing with the sun gear; and an inverse rotation mechanism meshing with the planetary gear and rotating the agitation shaft in an opposite direction of the planetary gear. The agitation shaft is suspended on a connection member attached to the outer pipe so as to rotate in synchronization with a rotation center of the inverse rotation mechanism. A ground where the outer pipe is penetrated and a solidifying material discharged from the agitation shaft are agitated and mixed with each other by agitation blades radially attached to the agitation shaft with a trajectory of distal ends of the agitation blades drawing a substantially polygonal shape by rotation of the agitation shaft.

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
• E02D 5/46 - Concrete or concrete-like piles cast in position making in situ by forcing bonding agents into gravel fillings or the soil

Abstract

A ground improvement apparatus includes: an inner shaft arranged inside an outer pipe and including a mechanism for rotating a crank at a rotation speed four times as fast as that of the outer pipe; agitation blades supported by the outer pipe so as to reciprocate in a radial direction of the outer pipe and including discharge outlets; and a slider crank mechanism for converting a rotation movement of the crank to a reciprocating movement of the agitation blades. A ground at a location where the outer pipe is penetrated and a solidifying material discharged from the discharge outlets are agitated and mixed with each other to form an improved body having a substantially rectangular cross section by rotating the agitation blades while advancing and retreating the agitation blades relative to each other via the slider crank mechanism by rotation of the crank.

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
• B26D 1/28 - Cutting through work characterised by the nature or movement of the cutting memberApparatus or machines thereforCutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting
• B26D 1/11 - Cutting through work characterised by the nature or movement of the cutting memberApparatus or machines thereforCutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge with a plurality of cutting members

Abstract

[Problem] To establish a W/C setting method for a deep-layer mixing method with which low-variation strength and shape can be realized on foundations of any kinds and a device for this setting method. [Solution] This W/C setting method comprises: a first step in which a total water quantity (Wg) of water quantity in soil and water quantity in a cement slurry is determined; a second step in which at least three values of different ratios (Wg/C) of the total water quantity (Wg) and a cement quantity (C) are set; a third step in which indoor blending tests are performed on the basis of the three different values and a uniaxial compressive strength is determined for each; a fourth step in which the uniaxial compressive strengths determined in the third step are used to create a slurry curve in a correlation chart; a fifth step in which the ratio (Wg/C) of the total water quantity (Wg) to the cement quantity (C) corresponding to a target strength is determined on the basis of the slurry curve; and a sixth step in which a cement addition quantity and a water/cement ratio corresponding to the target strength are determined on the basis of the ratio (Wg/C).

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil

Abstract

A method of compacting soil performing the steps of establishing a grid pattern of individual partitions at a jobsite, performing a first tamping session to tamper each partition using a 10′×10′ vibro tamper plate for about 90 seconds followed by at least 4 days of settling. Performing a second tamping session to tamper each partition using the 10′×10′ vibro tamper plate timed for about 120 seconds followed by at least 4 days of settling. Performing a third tamping session to tamper each partition using a 7′×7′ vibro tamper plate for about 90 seconds followed by about 6 days of settling.

IPC Classes  ?

• E02D 3/046 - Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil

Abstract

A permeable groundwater purifying wall (10A) obtained by vertically arranging permeable wall main bodies (10) in the ground (8) downstream of contaminated groundwater (9) so as to intersect the direction in which the contaminated groundwater (9) flows, the wall main bodies containing a detergent (A, B) for purifying a contaminant (a, b); wherein the permeable wall main bodies (10) separately containing different types of detergent (A, B) are placed together in multiple rows. The multiple rows of wall main bodies (10) are formed respectively by pluralities of sand piles (11, 12) filled with the different types of detergents (A, B) and compacted into continuous wall formations. According to the present invention, it is possible to provide a permeable groundwater purifying wall that can be constructed in a short amount of time at low cost, can maintain consistently high purification performance without hindering the flow of groundwater, and can address complex contamination.

IPC Classes  ?

• C02F 1/28 - Treatment of water, waste water, or sewage by sorption
• E02D 3/10 - Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
• G21F 9/12 - Processing by absorptionProcessing by adsorptionProcessing by ion-exchange

Abstract

A ground improvement method in which a screw rod (3) provided with a stirring blade (2) is inserted into the ground to a predetermined depth while rotating without a ground improvement material being injected, and the screw rod is extracted while the ground is stirred and mixed using the stirring blade while the screw rod is rotated and the ground improvement material is injected therefrom. The number of rotations of the stirring blade when the screw rod is inserted and the ground improvement material is not injected is included in the number of rotations of the stirring blade when the screw rod is removed and the ground improvement material is injected, and taken to be an adjusted number of blade rotations. The adjusted blade rotation number is set on the basis of the target ground improvement body strength variation coefficient, from a predefined relationship between the ground improvement body strength variation coefficient and the adjusted number of blade rotations. Ground improvement is performed using the set adjustment number of blade rotation as a construction management category. It is thereby possible to improve construction efficiency while ensuring adequate construction quality.

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil

Abstract

Provided is a wave-dissipating block comprising a body portion, and a plurality of leg portions protruding radially outward from the body portion. In at least one of those leg portions, the thickest portion is positioned outside of the thinnest portion. The length along the leg axis from the center of gravity to the thickest portion is larger by 0.6 times than the length along the leg axis from the center of gravity to the leading end of the leg portion. The length along the leg axis from the center of gravity to the thinnest portion is smaller by 0.4 times than the length along the leg axis from the center of gravity to the leading end of the leg portion. The wave-dissipating block can improve the void ratio at a stacking time, thereby to reduce the amount of concrete to be used for the manufacture. As a result, the cost for the execution of work of a levee body can be suppressed to a low level. Moreover, the leg portions are so club-shaped that they can bite the adjoining blocks excellently to establish a high stability.

IPC Classes  ?

• E02B 3/14 - Preformed blocksArrangements thereof