JPH0345021B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a multilayer tubular structure in which the outer peripheral surface of an inner tube made of synthetic resin or metal is coated with a material whose main component is a fire-resistant inorganic material. When making connections using various types of joints that have a structure of It relates to joint filling materials that serve to connect layers.

In recent years, buildings have become taller and their structures, functions, and uses have become more diverse, but at the same time, the safety of their attached equipment, such as the piping that leads to each floor and each room, has become more important in the event of a fire. A high level of sophistication is required.

In recent years, multilayer tubular structures to which the material of the present invention is applied, as well as joints with similar structures, have become popular in recent years as they enhance safety in terms of disaster prevention.

As the synthetic resin inner pipe, a hard vinyl chloride pipe is mainly used, and a multi-layered tubular structure in which this is combined with an outer layer pipe mainly composed of a fire-resistant material such as a hydraulic inorganic material or an inorganic fiber, etc. The fittings consist of a drain pipe, a ventilation pipe attached to the drain pipe,
Used for power distribution pipes, water supply pipes, supply and exhaust ducts, etc. By adopting this configuration, while taking advantage of the features of the inner pipe such as workability, durability, low cost, and low running water noise, the fire-resistant outer layer of the pipe allows the inner pipe to be transmitted to the next room or upper floor in the event of a fire. prevent the spread of fire,
This has the effect of minimizing damage.

Metal inner pipes are made of materials such as aluminum, galvanized iron plates, and stainless steel.Those coated with fire-resistant materials are not very popular at present, but they are used, for example, in ducts for group cables. For example, in the event of a fire, it is possible to lengthen the energization time to ensure time for evacuation, and if it is used, for example, in an air supply/exhaust duct, it can prevent the risk of fire spreading due to overheating.

When piping these multi-layered tubular structures, there is a method of directly gluing or welding the inner tubes together, but usually they are connected using various types of joints coated with the same type of coating as described above. In the latter case, the covering layer of the multilayer tubular structure is peeled off by the amount necessary for insertion into the joint, and only the inner tube is inserted and fixed by adhesive. In other words,
In either case, a connection is made between both inner tubes, and no connection is made between both outer layer tubes. Even if the outer layer pipes at the connection part are butted against each other, there is a small gap between them, and in the event of a fire, flames or high-temperature air may enter, and there is no safety against fire. In view of this, this gap also needs to be completely filled or covered with a refractory mineral material. On the other hand, the piping process is often carried out in relatively narrow spaces, and joint work is usually done after all the pipe connection work is completed, so it is extremely difficult to complete the joint work on the back of the pipes. .

Under these circumstances, a method has been developed in which a metal band with rock wool, etc. glued to one side is made for each diameter of the pipe, and the rock wool, etc. side is placed on the outer layer of the pipe, and the band is wrapped and fixed around the joint area. .

Although it is easy to install and can properly seal joints even in areas that cannot be reached by hands or eyes, such as the back side of the pipe, it has the disadvantage of high costs as it is necessary to manufacture multiple types according to the pipe diameter as mentioned above. Moreover, in terms of appearance, it is not possible to obtain the same material quality as the multilayer pipe.

On the other hand, a mixture of asbestos and cement is also commercially available and can be obtained relatively cheaply, and when the mixture is mixed with water and rolled on a board etc. under pressure, it becomes a string, and this can be used as a headband at the joint. Wrapping it in a shape and pressing it with a trowel or the like to shape it makes it relatively easy to fill or cover the joint area without any gaps, and it is often used because it allows the bonding and fixing of the butted coating layers. However, adjustment of joint material is usually done in small batches in the required amount, and the work of weighing and kneading materials containing asbestos is carried out in the narrow pipe construction area mentioned above, which poses safety and health problems. Moreover, when various other fibrous materials are used instead of asbestos after piping construction, even if it is made into the string shape, it lacks toughness and tends to break when used as a headband.

Therefore, an object of the present invention is to provide a joint filling material that is improved in view of the drawbacks of various conventional fiber materials other than asbestos as joint materials. As a result of extensive research in accordance with this objective, the present inventors found that 0.2 to 2.5 parts of fibrous material with a length of 2 mm or more and 15 mm or less, excluding asbestos, is added to 100 parts by weight of fire-resistant inorganic material including hydraulic inorganic material.
If 0.05 to 1.0 parts by weight of a water-soluble polymeric material is added, an appropriate amount of water is added and the mixture is kneaded and rolled on a flat plate under pressure to form a string like the above-mentioned fire-resistant inorganic material and asbestos. The inventors have discovered that it can be wrapped around joints like a headband and shaped relatively easily, and that it has sufficient fire resistance, leading to the completion of the present invention.

Examples of hydraulic inorganic materials in the present invention include portland cement, silica cement, blast furnace cement, fly ash cement, alumina cement, various ettringite cements, and various types of gypsum. For the purpose of reinforcement, weight reduction, increase in weight, etc., pearlite, vermiculite, mica, volcanic rock, silica sand,
It is also good to add aluminum hydroxide, calcium carbonate, calcium silicate, etc.

The fiber materials used in the present invention include various fiber materials other than asbestos, such as inorganic fibers such as rock wool and glass fiber, pulp, various natural organic fibers such as hemp, cotton, western wool, and silk, and polyester. , polyamide, polyimide, polyvinyl chloride,
Various organic synthetic fibers such as polyurethane, polyolefin, vinylon, polyacrylonitrile, etc. can be used. Even organic fibers can be used in the present invention without essentially reducing the fire resistance.

The length of these fiber materials in the present invention is preferably 2 mm or more and 15 mm or less, preferably 3 mm or more and 10 mm or less. If the fiber length is less than 2 mm, it will easily break under its own weight when made into a string, and if the fiber length is 15 mm or more, the kneading operation will be extremely difficult. The amount of fiber material added is 0.2~
2.5 parts by weight, preferably 0.5 to 1.5 parts by weight,
If it is less than 0.2 parts by weight, it will tend to tear under its own weight when it is made into a string, and if it is more than 2.5 parts by weight, it will not only become difficult to knead, but also have reduced fire resistance.

Examples of water-soluble polymer materials in the present invention are as follows.

Water-soluble cellulose derivatives such as CMC, MC, HEC, and HPC, alginic acid, gum arabic, proteins such as gelatin and casein, polyvinyl alcohol, polyethylene oxide, polypropylene oxide, polyacrylic acid, polymethacrylic acid, water-soluble polyester, and water-soluble polyepoxy compounds. , ketone formaldehyde resin, polyvinylpyrrolidone, polyamine, urea formaldehyde resin, melamine formaldehyde resin, phenol formaldehyde resin, starch and its derivatives.

Addition amount of water-soluble polymer material is 0.05 part by weight or more
It is preferably within 1.0 part by weight, more preferably from 0.1 part by weight to 0.6 part by weight. If it is less than 0.05 part by weight, it will be difficult to form the aforementioned fiber material into a string, and the adhesion to the outer layer tube will be insufficient. The kneaded material will stick to the surface, making it impossible to work.

When kneading the joint filling material of the present invention with water, it is preferable to knead while adding water little by little to obtain the optimum softness. It is best to roll it under pressure by hand on a board.

Wrap this string-like material around the joints like a headband, press it with a trowel, etc., to shape it, and finish it to the specified width and thickness.

The joint filling material of this invention does not use asbestos, but uses other ordinary fiber materials, and has specified ingredients and composition that have the same performance as asbestos, and has workability and ease of construction. Of course, it has excellent durability and fire resistance, making it practical.

The present invention will be explained in more detail below with reference to Examples.

Example 1 The following ingredients and composition were blended in advance using a Henschel mixer.

Portland cement 5.0Kg Silica sand 2.5 Dolomite plaster 1.5 Slaked lime 1.0 Nylon fiber (5 denyl, 5mm length) 0.08 Methyl cellulose 0.025 2.0Kg of this blend was taken and kneaded in a mixing bowl while adding water little by little. When I added 0.65 kg of water, it became the appropriate softness, so I rolled it evenly on the board while applying pressure with my hand, and made a ball with a diameter of about 1.5 cm and a length of about 1.5 cm.
I made it into a 35cm string. This thing had enough strength that it could be hung by holding one end. This string-like object, a soft polyvinyl chloride pipe as an inner pipe,
The outer layer of the drainage pipe is made of lightweight concrete reinforced with alkali-resistant glass fiber, wrapped around the joint joint, pressed by hand and finished with a trowel into a strip approximately 5 mm thick and 30 mm wide.
Natural curing was applied. No abnormalities were observed at this joint even one month after construction.

Example 2 The following ingredients and composition were blended and kneaded in exactly the same manner as in Example 1, and joint treatment was performed.

Portland cement 5.0Kg Silica sand 2.5 Calcium carbonate 2.5 Vinylon fiber (10 denier, 6mm length) 0.2 Polyvinyl alcohol 0.05 Similar to Example 1, this joint construction is easy as it can be done by wrapping a string-like material around it.
No abnormalities occurred even after several months.

Reference example 1 A heating test was conducted for 2 hours in accordance with JIS A 1304 (fire resistance test method for building structural parts) for the products of Examples 1 and 2, one month after construction. No abnormalities such as cracks were observed.

Comparative Example 1 A joint material was blended using the same recipe and operation as in Example 1, except that 0.12 kg of methyl cellulose had the composition of Example 1. When I mixed water with this mixture and tried to roll it on a board, it stuck to my hands and I could not form it into a string.

In addition, a joint material was blended using the same recipe and operation as in Example 1, except that methyl cellulose was used at 0.001 kg.

This material was kneaded with water and made into a string using the same method, but when it was hung by one end, it immediately broke and could not withstand actual joint construction.

Claims (1)

[Claims] 1 100 fire-resistant inorganic materials including hydraulic inorganic materials
The outer periphery of a synthetic resin or metal inner tube made by adding 0.2 to 2.5 parts by weight of a fiber material with a length of 2 mm or more and 15 mm or less, excluding asbestos, and 0.05 to 1.0 parts by weight of a water-soluble polymer material, based on the weight part. A joint filling material for multilayer tubular structures whose surfaces are coated with a fire-resistant inorganic material.