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.
E02D 3/11 - Amélioration ou conservation du sol ou de la roche, p.ex. conservation du permagel par des moyens thermiques, électriques ou électro-chimiques
B02C 1/06 - Broyeurs à mâchoires à mâchoires à double action
E02D 19/14 - Retenue d'eau souterraine par damage ou par interruption du passage de l'eau souterraine par congélation du sol
E02D 3/115 - Amélioration ou conservation du sol ou de la roche, p.ex. conservation du permagel par des moyens thermiques, électriques ou électro-chimiques en gelant
E21D 1/12 - Préparation du terrain par congélation
E21D 9/04 - Creusement de galeries en terrain de faible consistance; Dispositifs à cet effet non prévus ailleurs
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.
E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
B05B 15/00 - APPAREILLAGES DE PULVÉRISATION; APPAREILLAGES D'ATOMISATION; AJUTAGES OU BUSES - Parties constitutives des installations ou des appareillages de pulvérisation non prévus ailleurs; Accessoires
G01M 99/00 - Matière non prévue dans les autres groupes de la présente sous-classe
G01N 7/14 - Analyse des matériaux en mesurant la pression ou le volume d'un gaz ou d'une vapeur en permettant au matériau d'émettre un gaz ou une vapeur, p.ex. la vapeur d'eau, et en mesurant une différence de pression ou de volume
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.
E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
B05B 15/00 - APPAREILLAGES DE PULVÉRISATION; APPAREILLAGES D'ATOMISATION; AJUTAGES OU BUSES - Parties constitutives des installations ou des appareillages de pulvérisation non prévus ailleurs; Accessoires
4.
GROUND FREEZING CONSTRUCTION METHOD AND GROUND FREEZING SYSTEM
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.
E02D 3/115 - Amélioration ou conservation du sol ou de la roche, p.ex. conservation du permagel par des moyens thermiques, électriques ou électro-chimiques en gelant
E02D 19/14 - Retenue d'eau souterraine par damage ou par interruption du passage de l'eau souterraine par congélation du sol
E21D 1/12 - Préparation du terrain par congélation
E21D 9/04 - Creusement de galeries en terrain de faible consistance; Dispositifs à cet effet non prévus ailleurs
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.
C04B 22/14 - Acides ou leurs sels comportant du soufre dans la partie anionique, p.ex. sulfures
C04B 24/06 - Acides carboxyliques; Leurs sels, anhydrides ou esters comportant des groupes hydroxyle
C04B 24/30 - Polymères de condensation d'aldéhydes ou de cétones
C04B 28/02 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p.ex. contenant des ciments de polycarboxylates contenant des ciments hydrauliques autres que ceux de sulfate de calcium
E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
brevets
