Inner rubber wear detection hose

Abstract

To provide an inner rubber wear detection hose that can detect wear of the inner layer of the hose by detecting a change in current flow without the need to draw a conductive detection wire outside the hose. [Solution] The wear detection wire 2 on the inner rubber 1 can detect wear of the inner rubber 1 by a change in the current flow between the surface of the connecting fitting and the current-carrying terminals 6, 8 embedded in the outer rubber 5 without being pulled out to the outside of the hose.

Description

[Technical field]

[0001] This invention relates to detecting wear on the inner surface of a concrete tip hose used in pouring concrete. [Background technology]

[0002] It has been reported that 83% of burst accidents during concrete pouring work occur at the tip of the hose once a year. (Architectural Institute of Japan Technical Report, Vol. 26, No. 63, 440-444) To prevent these accidents, visual inspection before and after use is used as an inspection method to prevent accidents. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-270844 Summary of the Invention [Problem to be solved by the invention]

[0004] As a method for detecting wear on the inner layer of a hose, Japanese Patent Application Laid-Open No. 8-270844 discloses a method in which a conductive detection wire is placed between the inner layer and the pressure-resistant reinforcing layer and then led out to the outside of the hose to detect wear. [Means for solving the problem]

[0005] In this device, the conductive terminal embedded in the outer rubber of the hose adjacent to the metal fitting conducts electricity through the conductive detection wire and reinforcing wire built into the hose. Therefore, wear of the inner rubber can be detected by the change in the current between the surface of the metal fitting and the conductive terminal embedded in the outer rubber, without the need to pull the detection wire outside the hose. Effect of the Invention

[0006] If the detection wire is broken due to wear of the concrete, the surrounding rubber contains carbon, so the electrical resistance between the electrified terminals increases significantly. If a lamp is used, it will only light up dimly, making it possible to detect the break in the detection wire. [Brief description of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view of an embodiment of a hose for detecting wear of an inner rubber of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] This device uses an electrically conductive detection wire to detect wear on the inside of the hose. When the inside of the hose wears and the detection wire breaks, it loses its electrical conductivity, making it possible to know the wear by checking this. EXAMPLES

[0009] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is an enlarged cross-sectional view of a ready-mix concrete tip hose with an inner diameter of 95 mm, showing an application example of the present invention. The connection fitting consists of a collar 9 and a nipple 10. On the inner rubber 1, a detection wire 2 wound at approximately the same pitch as the reinforcing wire 4 is spirally wound, and on top of this, a fiber reinforcing cord 3 and an outer rubber 5 are arranged.

[0010] An electric terminal 1, indicated by the reference number 8, is welded onto the nipple, and a detection wire connected to it is spirally arranged on the inner rubber of the hose and connected to the reinforcing wire at the end of the hose. An electric terminal 2, indicated by the reference number 6, is embedded in the outer rubber of the hose and is connected to the end of the reinforcing wire on the connecting fitting side by a conductive wire, indicated by the reference number 7. As a result, the electric terminal embedded in the outer rubber of the hose adjacent to the connecting fitting is in a state where electricity is flowing through the detection wire and reinforcing wire built into the hose. [Industrial Applicability]

[0011] With this device, the risk of bursting during concrete pouring work can be significantly reduced by conducting electrical continuity tests before and after using the hose. [Explanation of symbols]

[0012] 1 Inner rubber 2 Detection line 3 Fiber reinforcement layer 4 Reinforcing wire 5 Outer rubber 6 Power Terminal 2 7 Conductive Wire 8 Power Terminal 1 9 Colored metal fittings 10 Nipples

Claims

[Claim 1] This inner rubber wear detection hose is a concrete-tipped hose that is used for pouring concrete and has flexible inner and outer layers, a fiber reinforcement layer and reinforcing wires disposed between them, a connecting fitting at one end, and a concrete blowout section at the other end, and has no fittings.The inner rubber wear detection hose is characterized in that it detects wear of the inner rubber by checking the electrical connection between the connecting fitting and an electrical terminal embedded in the outer surface of the hose molded on the nipple of the connecting fitting.

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