Abstract

The purpose of the present invention is to provide an artificial ground freezing method having good coolant thermal efficiency without a gas-phase coolant being released into the ground or into the air. For that purpose, the present invention has: a freeze pipe (1: casing) for freezing the ground buried in the ground and a coolant circulation pipe (2) provided on the inside of the freeze pipe (1), wherein the coolant flowing inside the coolant circulation pipe (2) is carbon dioxide; and a coolant apparatus (10) that cools and supplies the carbon dioxide to the coolant circulation pipe (2), the coolant circulation pipe (2) comprising a first coolant circulation pipe (2A) on which a plurality of micro-coolant passages (2A delta) is formed, wherein the tip portion (tip portion in the ground) of the first coolant circulation pipe (2A) is connected to a plugging member (3: bottom socket) that connects the plurality of micro-coolant passages (2A delta) of the first coolant circulation pipe (2A) to a coolant supply side and coolant return side.

IPC Classes  ?

• E02D 3/11 - Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electrochemical means
• B02C 1/06 - Jaw crushers or pulverisers with double-acting jaws
• E02D 19/14 - Restraining of underground water by damming or interrupting the passage of underground water by freezing the soil
• E02D 3/115 - Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electrochemical means by freezing
• E21D 1/12 - Preparation of the ground by freezing
• E21D 9/04 - Driving tunnels or galleries through loose materialsApparatus therefor not otherwise provided for

Abstract

The purpose of the present invention is to provide a determining device and a determining method to determine whether an inspected jet nozzle is defective by inspecting the jet nozzle for injecting a jet stream with long ground penetrating distance at a stage before installing in a construction site where a large diameter jet grouting method is used. To achieve this purpose, with this invention, in which a nozzle to be inspected is mounted onto an outlet port, a jet stream is ejected from a jet stream generating device, and measurement data measured by a pressure sensing unit when the jet stream impacts the pressure sensing unit is processed with a controlling device (for example, a computer), a nozzle to be inspected is determined to be a non-defective product if a first ratio is no less than a first prescribed value, a second ratio is no less than a second prescribed value, and a third ratio is no less than a third prescribed value.

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
• B05B 15/00 - Details of spraying plant or spraying apparatus not otherwise provided forAccessories
• G01M 13/00 - Testing of machine parts
• G01M 99/00 - Subject matter not provided for in other groups of this subclass
• G01N 7/14 - Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
• G01M 17/00 - Testing of vehicles

Abstract

The purpose of the present invention is to provide a determining device and a determining method to determine whether an inspected injection nozzle is defective by inspecting the injection nozzle for injecting a jet stream with long ground penetrating distance at a stage before installing in a construction site where a large-diameter injection mixing method is used. To achieve this purpose, with this invention, in which a nozzle to be inspected is mounted onto an injection port, a jet stream is injected from a jet stream injecting device, and measurement data measured by a pressure sensing unit when the jet stream impacts the pressure sensing unit is processed with a controlling device (for example, a computer), a nozzle to be inspected is determined to be a non-defective product if a first ratio is no less than a first prescribed value, a second ratio is no less than a second prescribed value, and a third ratio is no less than a third prescribed value.

IPC Classes  ?

• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
• B05B 15/00 - Details of spraying plant or spraying apparatus not otherwise provided forAccessories

Abstract

The purpose of the present invention is to provide a ground freezing construction method having good coolant thermal efficiency without a gas phase coolant being released into the ground or into the air. For that purpose, the present invention has: a freezing pipe (1: casing) for freezing the ground embedded in the ground and a coolant circulation pipe (2) provided on the inside of the freezing pipe (1), wherein the coolant circulating inside the coolant circulation pipe (2) is carbon dioxide; and a coolant apparatus (10) that cools and supplies the carbon dioxide to the coolant circulation pipe (2), the coolant circulation pipe (2) comprising a first coolant circulation pipe (2A) on which a plurality of micro-coolant paths (2A delta) is formed, wherein the tip portion (tip portion in the ground) of the first coolant circulation pipe (2A) is connected to a plugging member (3: bottom socket) that connects the plurality of micro-coolant paths (2A delta) of the first coolant circulation pipe (2A)to a coolant supply side and coolant return side.

IPC Classes  ?

• E02D 3/115 - Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electrochemical means by freezing
• E02D 19/14 - Restraining of underground water by damming or interrupting the passage of underground water by freezing the soil
• E21D 1/12 - Preparation of the ground by freezing
• E21D 9/04 - Driving tunnels or galleries through loose materialsApparatus therefor not otherwise provided for

Abstract

A grouting material characterized by comprising 3-40 mass% cement clinker, 60-97 mass% blast-furnace slag, and 0.5-3 parts by mass of plaster in terms of SO3 amount per 100 parts by mass of the sum of the cement clinker and blast-furnace slag, and by further containing 0.7-7 parts by mass of (i) a rapid-hardening calcium aluminate admixture; 0.01-0.13 parts by mass of (ii) a setting retarder; and 0.2-1.0 part by mass of (iii) a high-performance water-reducing agent per 100 parts by mass of those ultrafine particulate materials in the clinker, slag, and plaster which have a maximum particle diameter of 15 쎽m or smaller. The grouting material retains high injectability for long. After injection, the material rapidly starts to set to attain a satisfactory initial strength.

IPC Classes  ?

• C09K 17/44 - Inorganic compounds mixed with organic active ingredients, e.g. accelerators the inorganic compound being cement
• C09K 17/02 - Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
• C09K 17/06 - Calcium compounds, e.g. lime
• C09K 17/08 - Aluminium compounds, e.g. aluminium hydroxide
• C09K 17/10 - Cements, e.g. Portland cement
• C09K 17/14 - Soil-conditioning materials or soil-stabilising materials containing organic compounds only
• C09K 17/24 - Condensation polymers of aldehydes or ketones
• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C04B 22/08 - Acids or salts thereof
• C04B 22/14 - Acids or salts thereof containing sulfur in the anion, e.g. sulfides
• C04B 24/06 - Carboxylic acidsSalts, anhydrides or esters thereof containing hydroxy groups
• C04B 24/30 - Condensation polymers of aldehydes or ketones
• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
• C04B 103/14 - Hardening accelerators
• C04B 103/22 - Set retarders
• C04B 103/32 - Superplasticisers
• C04B 111/70 - Grouts
• C09K 103/00 - Civil engineering use
• C09K 107/00 - Impermeabilisation