JP2017023510A - Fire hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire hose being smoothly extended in a short time.SOLUTION: The fire hose includes: a covering layer 2 composed of rubber or a synthetic resin, on an inner surface of a jacket 1; and a plurality of protruding strips 3 extending in the hose length direction, formed in the inner peripheral surface of the covering layer 2. An arrangement density of the protruding strips 3 in a continuous inner peripheral area A having a perimeter substantially one-quarter or less of the whole inner peripheral length L of the covering layer 2 in a cross-sectional surface perpendicular to the hose length direction is higher than an arrangement density of the protruding strips 3 in a remaining inner peripheral area other than the inner peripheral area A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire hose, and more particularly, to a fire hose that can be smoothly extended in a short time.

  2. Description of the Related Art Conventionally, fire hoses are often configured by lining a cover layer made of rubber or synthetic resin on the inner surface of a jacket made of a tubular woven fabric. This fire hose is stored and stored in a state of being flatly crushed, folded back and coiled into a double winding, and in use, it is released and stretched to roll on the road or on the floor. Used for water discharge. When the hose is extended, the shape of the entire hose is taken into consideration so that high-pressure water flows smoothly during discharge.

  For example, when the hose is extended as much as possible, it is required that the hose be extended straight so as not to meander or zigzag. Also, when the hose should be used in a relaxed state with its extra length, the surplus will not be zigzag or twisted, but in a gentle arc or arcuate form. It is required to expand quickly. The operator of the hose is required to perform the operation while paying attention to the optimum form of the entire hose while determining the fire point position (and thus the water discharge position).

  However, even if an attempt is made to perform a constant stretching operation as described above on a hose that is originally uniformly woven and uniformly coated with rubber or synthetic resin, few people are not used to handling it in an emergency. There were times when it had to be operated by the number of people, and it was not possible to easily expand the fire hose into the desired shape in a short time.

  In Patent Document 1, a pair of thick portions and a pair of thin portions extending in parallel with the hose longitudinal direction are alternately arranged in the circumferential direction of the hose, and the pair of thick portions are arranged on the inner surface of the jacket. A fire hose configured such that a pair of thin portions face each other across a hose shaft core is described. Since the fire hose described in Patent Document 1 has a high rigidity in the thick part, the hose can be quickly and straightly extended. However, when the coil winding is performed so that the pair of thick parts face each other, the winding diameter increases, and the storage property and operability are not always sufficient, and the strength of the thin part is also a concern.

  According to Patent Document 2, a coating layer made of rubber or synthetic resin is provided on the inner surface of a jacket made of a tubular woven fabric, and a weight extending in the length direction of the hose is formed on the inner surface of the coating layer, thereby reducing the weight. The fire hose that improves the water flow rate is described. Although the fire hose described in Patent Document 2 can be lightened and have excellent water running at the time of passing water, there is still room for improvement in handling of the hose, especially operability during deployment. there were.

JP 2000-140145 A JP 2014-66260 A

  An object of the present invention is to provide a fire hose that can be smoothly expanded in a short time.

  A fire hose that achieves the object of the present invention has a coating layer made of rubber or synthetic resin on the inner surface of a jacket, and a plurality of ridges extending in the hose length direction on the inner peripheral surface of the coating layer. Arrangement of the ridges in the continuous inner peripheral region A having a peripheral length of approximately one quarter or less of the total inner peripheral length of the coating layer in a cross section perpendicular to the hose length direction. The density is higher than the arrangement density of the protrusions in the remaining inner peripheral area other than the inner peripheral area A.

  According to the fire hose of the present invention, the arrangement density of the ridges in the inner peripheral region A having a peripheral length of approximately one quarter or less of the total inner peripheral length of the coating layer is set to the remaining inner peripheral region ridges. By making it higher than the arrangement density, the hose can be expanded smoothly in a short time.

  The inner peripheral length of the inner peripheral region A may be 1/18 to 1/4 of the total inner peripheral length of the coating layer. In the cross section, the plurality of protrusions may have the same width and height.

  The fire hose of the present invention has a weight per unit length of a half section including all the inner peripheral region A when the hose is divided into two equal parts so as to pass through the central axis on a transverse section perpendicular to the length direction. However, it is good that it is 1.03-1.3 times the weight per unit length of the half cross section containing only the said inner peripheral area | region B.

It is a section perspective view showing an example of an embodiment of a fire hose of the present invention. It is the cross-sectional view which showed another example of embodiment of the hose for fire fighting of this invention. It is a schematic diagram which expands and shows the cross section in another example of embodiment of the hose for fire fighting of this invention.

  Hereinafter, the fire hose of the present invention will be described in more detail.

  The fire hose of the present invention has a warp arranged in a hose length direction and a weft arranged in a spiral shape around a central axis CL of the hose length as shown in FIG. Thus, it has a jacket 1 made of a tubular fabric woven into a continuous tubular shape. Further, the jacket 1 has a coating layer 2 made of rubber or synthetic resin on the inner surface, and a plurality of protrusions 3 extending in the hose length direction on the inner peripheral surface 4 of the coating layer 2. It is practical and preferable that the protrusion 3 is made of the same constituent material as that of the coating layer 2 and is formed as an integral part continuous with the coating layer 2.

  The inner peripheral surface 4 of the covering layer 2 has a continuous inner peripheral region A and inner periphery having a peripheral length of approximately one quarter or less of the total inner peripheral length L of the covering layer 2 in a cross section perpendicular to the hose length direction. It consists of the remaining inner peripheral area excluding the area A. It is practical and preferable that the inner peripheral area A and the other inner peripheral areas are formed as a continuous unitary body made of similar constituent materials. Here, the total inner circumferential length L of the coating layer 2 in the cross section perpendicular to the hose length direction is the total length of the inner circumference 4 of the coating layer 2 when the protrusion 3 is not present.

  In the fire hose of the present invention, the arrangement density of the protrusions 3 in the inner peripheral area A is higher than the arrangement density of the protrusions 3 in the remaining inner peripheral area other than the inner peripheral area A. By making the arrangement density of the protrusions 3 in the inner peripheral area A occupying approximately one-fourth or less of the inner circumference higher than the other remaining areas, the center of gravity of the hose is located on the inner peripheral area A side from the central axis CL of the hose. Sneak away. Thereby, when the hose wound in the coil shape is released so as to roll on the road or the floor, the hose can be smoothly extended in a short time. For example, when a hose is expanded from a state where it is double-wound in a coil shape, the inner circumference area with a center of gravity can be released or rolled toward the direction of the direction in which it is desired to inflate as an arc or arcuate curve. The A side performs a leading action in the direction in which it is desired to be stretched, and the hose can be thrown so as to be easier to spread by spreading in a circular or curved shape more smoothly and smoothly. In addition, double winding is bent in the substantially central part of the full length of the hose and wound in a coil shape with the central bending point as a core part.

  Moreover, the hose crushed flatly has a plurality of ridges 3 on the inner peripheral surface 4, so that gaps are formed around the ridges 3. Since the crushed hose can be easily expanded, water permeability can be improved.

  The aspect in which the arrangement density of the protrusions 3 in the inner peripheral area A is higher than the arrangement density of the protrusions 3 in the remaining inner peripheral area other than the inner peripheral area A is the unit length on the circumference of the inner peripheral area A. It is to increase the number of ridges 3 present in. At this time, the size of the ridge 3, that is, the cross-sectional area of the ridge 3 in the cross section is the same as the size of the ridge 3 in the inner peripheral region A with respect to the size of the ridge 3 in the remaining inner peripheral region. Or larger. This makes it easier to shift the center of gravity of the hose from the central axis CL toward the inner peripheral region A side. In consideration of ease of forming the hose, it is preferable that the plurality of protrusions have the same width and height in the cross section.

  FIG. 2 is a cross-sectional view illustrating a cross section perpendicular to the hose length direction. In the fire hose of the present invention, the inner peripheral length of the inner peripheral region A is approximately ¼ or less of the entire inner peripheral length of the coating layer 2. In the example of FIG. 2, the inner peripheral region A occupies a length of approximately one quarter of the total inner peripheral length L of the coating layer 2.

  FIG. 3 is a schematic diagram in which the circumference of a cross section perpendicular to the hose length direction is developed and extended linearly. In the example of FIG. 3, the inner peripheral area A occupies a length of about 1/6 of the total inner peripheral length L of the coating layer 2.

  In the fire hose of the present invention, the inner peripheral length of the inner peripheral region A is approximately ¼ or less of the total length of the inner periphery of the coating layer 2, preferably from 1/8 to ¼, More preferably, it is 1/15 or more and 1/5 or less, More preferably, it is 1/12 or more and 1/6 or less. When the inner peripheral length of the inner peripheral region A exceeds approximately one-fourth of the total inner peripheral length L of the coating layer 2, the weight of the fire hose increases and the handleability decreases.

  In the present invention, when the fire hose is bisected so as to pass through the central axis on a cross section perpendicular to the length direction, the weight per unit length of the half cross section including the entire inner peripheral region A is It is good that it is 1.03 to 1.3 times the weight per unit length of the half cross section not including the inner peripheral region A. When the weight of the half cross section including the inner peripheral area A is less than 1.03 times the weight of the half cross section not including the inner peripheral area A, the bias in the center of gravity of the fire hose is reduced. May not be sufficiently improved. Moreover, when it exceeds 1.3 times, the weight of the hose for fire fighting will become large, and handling property will fall.

  When the fire hose is crushed flat, the position of the inner peripheral area A is not particularly limited, and the fire hose may be folded in a mountain so as to cover the inner peripheral area A, or the inner peripheral area A is You may make it locate in the approximate center of the width direction of the hose crushed flat. When the hose is crushed flat so that the position of the inner peripheral region A is substantially the center in the width direction of the hose, the stability of the double-wound hose and ease of expansion can be obtained. Further, when the hose is crushed flat so that the position of the inner peripheral region A is either left or right in the hose width direction, the hose can be expanded more easily in an arc shape.

  In the fire hose of the present invention, the height of the ridge 3 is the height h (mm) of the ridge 3 in order to minimize the flow resistance at the time of water flow and water discharge and to obtain a large rectifying effect by the ridge. Preferably, h = 0.1 to 1.5 (mm), more preferably h = 0.1 to 0.5 (mm), and the width w (mm) of the protrusion 3 is preferably w = 0. .2 to 2.5 (mm), more preferably w = 0.2 to 0.8 (mm).

  Further, in the remaining inner peripheral region other than the inner peripheral region A, the center distance lb (mm) between the adjacent protrusions 3 and 3 is preferably lb = 5 to 15 (mm), more preferably lb = 6 to It is good that it is 10 (mm). In the inner peripheral region A, the center distance la (mm) between the adjacent protrusions 3 and 3 is preferably la = 3 to 12 (mm), more preferably la = 4 to 8 (mm). Good. The center distance la is necessarily smaller than the center distance lb.

  The number of protrusions arranged on the inner peripheral surface of the coating layer 2 can be determined according to the size of the hose, that is, the total inner peripheral length L. For example, when the total inner circumferential length L = 200.5 ± 3.5 (mm), 20 to 40 protrusions 3 are preferably arranged around the inner circumference, more preferably 25 to 35.

  In the present invention, the thickness t (mm) of the coating layer 2 is preferably t = 0.2 to 0.6 (mm), more preferably t = 0.2 to 0.4 (mm). . If it is thinner than this range, it is not preferable in that the durability of the coating layer itself, the durability of the ridge and the pressure loss increase, and if it is thicker than this range, the overall weight increases. In addition, it is not preferable in that the material cost increases, that is, the cost increases.

  Further, the woven structure of the tubular woven fabric is not particularly limited, but a plain weave or twill weave common as a fire hose is preferable for obtaining the effects of the present invention.

  The fire hose of the present invention can be basically manufactured by a method according to a normal manufacturing method. That is, after manufacturing the tubular woven fabric constituting the jacket and the tube-shaped coating layer 2 provided with the protrusions 3 separately, the heating fluid pressurized inside is filled in a state where both are overlapped, It can be manufactured by bonding the coating layer 2 to the inner surface of the jacket 1. However, the manufacturing method is not particularly limited. For example, after the coating layer 2 is extruded on the outer peripheral side of the jacket 1 and the ridges 3 that extend to the outer peripheral surface are formed through the die, A method of reversing the outer surface or a method of forming a coating layer 2 on the inner surface by impregnating a resin or the like from the outer side to the inner side of the jacket 1 and passing a die inside to form a protrusion 3 on the inner surface. It may be adopted.

  2 warp yarns of polyester bulk yarn (1100 dtex) are used as the weft yarn, and the weave structure is 2/1 twill weave, the number of driven yarns is 476/10 cm, A tubular woven fabric (hose jacket) for a fire hose having a nominal diameter d = 65 mm was manufactured at 50 wefts / 10 cm.

  Using this common tubular fabric, a fire hose according to the present invention (Example 1) and a fire hose other than the present invention (Comparative Example 1) were produced as follows. In any case, the total length of one hose is 20.2 m at the hose portion.

Example 1
After extruding the coating layer 2 on the outer peripheral surface of the tubular woven fabric obtained above and forming a plurality of ridges 3 extending in the hose length direction on the outer peripheral surface through a die Then, the inner and outer surfaces of the hose were inverted to form the coating layer 2 having the protrusions 3.

  The inner peripheral surface of the coating layer 2 was composed of an inner peripheral region A and an inner peripheral region B. The peripheral length of the inner peripheral region A was set to 1/6 of the total inner peripheral length L of the coating layer 2. The remaining five-sixth circumference area was defined as an inner circumference area B.

The height ha (mm) of the protrusions 3 in the inner peripheral region A was 0.3 mm, the width wa of the protrusions was 0.5 mm, and the arrangement density of the protrusions 3 was 18/10 cm. On the other hand, the height hb (mm) of the protrusions 3 in the inner peripheral region B was 0.3 mm, the width wb of the protrusions was 0.5 mm, and the arrangement density of the protrusions 3 was 14/10 cm. The thickness t (mm) of the coating layer 2 is t = 0.3 mm, the coating layer is formed of urethane resin, and the amount of adhesion per unit area of the jacket is 450 g / m ² .

  Cut the obtained fire hose into a length of 10 cm and bisect into a half cross section including all the inner peripheral area A and a half cross section including only the inner peripheral area B so as to pass through the central axis on the cross section I made it. The weight per 10 cm of the half section including the entire inner peripheral region A was 1.07 times the weight per 10 cm of the half section including only the inner peripheral region B.

  The hose having a total length of 20.2 m obtained above was double-wound, and a test was conducted on the stretchability when the right-handed person was released so as to draw a gentle arc. As a result, the fire hose of the present invention spreads in a good clean arc shape when released and is easy to expand as desired. In addition, meandering and zigzag generation were less than conventional fire hoses.

Comparative Example 1
In the fire hose of Example 1, the fire hose was manufactured in the same manner as in Example 1 except that the arrangement density of the protrusions 3 was 15/10 cm in the entire inner peripheral region of the coating layer 2.

  The hose obtained above was double-wound and tested for stretchability when a right-handed person released in that state. As a result, when the fire hose of Comparative Example 1 was released so as to draw a gentle arc, the fire hose of Example 1 was expanded in a nearly arc shape compared to the fire hose of Example 1. Moreover, the occurrence of meandering and zigzag during hose extension was slightly more than that of the fire hose of Example 1.

  Although the difference between the present invention and that of the comparative example seems to be slight, in actual fire fighting activities, the number of hoses to be connected may exceed three, and the difference in performance results in a difference in the results of fire fighting activities. Therefore, a high-performance fire hose with a good balance in terms of water flow speed and pressure loss is useful.

1: Jacket 2: Cover layer 3: ridge 4: Inner circumferential surface h: ridge height w: ridge width t: cover layer thickness d: nominal diameter of fire hose D1: weft weaving spiral Direction D2: Spiral formation spiral direction CL: Hose length direction central axis of fire hose

Claims (4)

  A fire hose having a coating layer made of rubber or synthetic resin on the inner surface of the jacket, and having a plurality of protrusions extending in the hose length direction on the inner peripheral surface of the coating layer, the hose length direction The arrangement density of the ridges in the continuous inner circumferential area A having a circumferential length equal to or less than about one quarter of the total inner circumferential length of the coating layer in a cross section perpendicular to the inner surface is the remaining inner area other than the inner circumferential area A. A fire hose characterized by having a density higher than the arrangement density of the protrusions in the circumferential region.   2. The fire hose according to claim 1, wherein an inner peripheral length of the inner peripheral region A is equal to or greater than one-eighth and one-fourth of a total inner peripheral length of the coating layer.   The fire hose according to claim 1 or 2, wherein the plurality of protrusions have the same width and height in the cross section.   When the hose is bisected so as to pass through the central axis on a cross section perpendicular to the length direction, the weight per unit length of the half cross section including all the inner peripheral region A is equal to that of the other half cross section. The fire hose according to any one of claims 1 to 3, wherein the weight is 1.03 to 1.3 times the weight per unit length.

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