JPS6098296A - Low-temperature corrugated expansion joint - Google Patents

Abstract

PURPOSE:To prevent a crack from being produced even under the brittle temperature of a heat insulating material by duplicating heat insulating structure and applying one structure to the insulation of heat of an expansion joint and applying another to the insulation of heat of the heat insulating material for expansion joint while enabling the latter to slide. CONSTITUTION:When a force 3 of expansion or contraction is applied to a corrugated expansion joint 1, it expands or contracts. And a duplicated heat insulating expansion joint 4 slides in accordance with the expansion and contraction of the corrugated expansion joint 1. Also, even when the ambient temperature 6 is below the brittle temperature of a heat insulating material 2 for expansion joint, the heat insulating action of the duplicated heat insulating material 4 and a complementary heat insulating material 5 prevents the temperature of the heat insulating material 2 for expansion joint from becoming below its brittle temperature, accordingly preventing a crack from being produced.

Description

DETAILED DESCRIPTION OF THE INVENTION A conventional corrugated expansion joint having a cold insulation structure has a structure in which a cold insulation structure 2' is directly bonded to a corrugated joint 1', as shown in FIG. Therefore, if an expansion force of 5' is applied to the corrugated joint 1' below the embrittlement temperature of the cold insulating material used in the cold insulation structure, the cold insulation structure 2' will not be able to follow the elongation of the corrugated joint, and the second
As shown in the figure, all cases had the defect of 4° cracks.

In recent years, there has been remarkable progress in low-temperature equipment such as underground LNG tanks, and expansion joints are increasingly being used in low-temperature environments. The development of low-temperature cold insulation materials has not been able to meet this demand in the present invention, and there are practically no cold insulation materials that do not become brittle below the LNG temperature (approximately -165°C), and can be used even below the embrittlement temperature of cold insulation materials. Is it possible to get an expansion joint? It was invented for this purpose.

In the case where the cold insulating material is used at a temperature below the embrittlement temperature, the present invention has a full-duplex cold insulating structure, one of which is responsible for all of the cold insulation of the expansion joint, and the other of which is responsible for all of the cold insulation of the cold insulating material for the expansion joint, and has a cold insulation effect. Regarding low-temperature corrugated expansion joints, which are characterized by the ability to slide freely without running out of metal, we have adopted a full-duplex cold insulation structure to ensure that the temperature of the cold insulation material bonded to the corrugated joints does not drop below the embrittlement temperature. The objective is to provide a complete range of low-temperature corrugated expansion joints that can be used as expansion joints that do not generate cranks even at temperatures below the embrittlement temperature of the cold insulation material, with a cold insulation structure that allows free sliding according to the expansion and contraction of the corrugated expansion joint. , LNG underground tanks, LNG above ground tanks, and other low temperature equipment.

Embodiments of the low-temperature corrugated expansion joint of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic diagram of an embodiment of the low temperature corrugated expansion joint of the present invention.

FIG. 4 shows a complete schematic diagram of the present invention when a stretching force is applied.

1 is a wave-shaped expansion joint, 2 is a cold insulation structure for expansion joints, 4-layer double structure cold insulation material, and 5 is an auxiliary cold insulation material. The double structure cold insulation material 4 is divided into two parts, and the auxiliary cold insulation material 5 is on one side.
is glued. The double-layer cold insulating material divided into two parts is structured so that it can slide freely according to the expansion and contraction of the corrugated expansion joint 1.

The operation of the present invention will be explained. When an expansion force 3 is applied to the wave expansion joint 1, the wave expansion joint 1 expands and contracts as shown in FIG. At this time, the double structure cold insulator 4 slides freely according to the expansion and contraction of the corrugated expansion joint 1. Furthermore, even if the external temperature 6 is below the embrittlement temperature of the cold insulation material 2 for expansion joints, the cold insulation material 2 for expansion joints will not become below the embrittlement temperature due to the cold insulation effect of the double structure cold insulation material 4I and the auxiliary cold insulation material 5. No cracks occur. The void 7 generated at this time is kept cool by the auxiliary cold insulating material 5. The present invention has the above configuration, and even if the temperature of the cold insulating material is below the embrittlement temperature of the expansion joint retaining material, if the temperature of the cold insulation material is below the embrittlement temperature vc, First, it is possible to obtain a stretching effect without cracking.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a corrugated expansion joint with a conventional cold insulation structure, Fig. 2 is a schematic diagram of cracks occurring in the cold insulation material when expansion and contraction force is applied, and Fig. 3 is a corrugated expansion joint for low temperature use of the present invention. 1 is a schematic diagram of an embodiment of the invention. Is Fig. 4 a schematic diagram when an elastic force is applied to an embodiment of the present invention? show. 1... Corrugated expansion joint, 2... Cold insulation material,
4...Double structure cold insulating material, 5...Auxiliary cold insulating material, 3...Stretching force, 6...External temperature, 7
······gap. Figure 1 Figure 3 Figure 72 Figure 4 Figure 3

Claims (1)

[Claims] When the cold insulation material is used at temperatures below the embrittlement temperature, the cold insulation structure is fully double-layered, one for the entire cold insulation of the expansion joint, and the other for the cold insulation of the expansion joint without losing its cold insulation effect. Being able to slide freely 't='l?
A corrugated expansion joint for low temperatures.