JPS5918140A - Joint filling material for double layer pipe structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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. Joints with this configuration are used for drain pipes, ventilation pipes attached to drain pipes, 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 water noise, the fire-resistant outer layer pipe can be used to prevent the inner pipe from connecting to the next room or upper floor in the event of a fire. This is effective in preventing the spread of fire and 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 multilayer tubular structures, there is a method of directly gluing or welding the inner pipes, but usually, as described above, various types of joints coated with the same type of coating are used to connect them. 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.

That is, in each case a connection is made between both inner tubes,
Both outer layer pipes must be connected. 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, piping construction is often carried out in relatively narrow spaces, and joint work is usually done after all pipe connections have been completed, so it is extremely difficult to complete the joint work on the back of the pipes. I can do it.

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 pipe diameter, and the rock wool, etc. side is made to cover the joint and is wrapped around and fixed, with the rock wool, etc. side facing the outer pipe. .

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. However, 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 is obtained at a relatively low cost.The mixture of scales and water is pressed on a board, etc. and forms a string, and this is 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 and 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, which poses health and safety problems.Also, when various other fiber materials are used in place of asbestos after piping construction, even if it is made into a string shape, It lacks toughness and has the disadvantage of being easily cut 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 these objectives, the present inventor found that
For 100 parts by weight of fire-resistant inorganic materials including hydraulic inorganic materials, 02 to 25 parts by weight of fibrous materials with a length of 2 mm to 15 mm, excluding asbestos, and 005 to 005 parts by weight of water-soluble polymer materials.
For those containing 10 parts by weight, add an appropriate amount of water and knead.
By rolling it under pressure on a flat plate, it can be made into a string like the above-mentioned fire-resistant inorganic material and asbestos, and it is also possible to wrap it around the joint like a headband and shape it relatively easily. They also found that the material had 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. Pearlite, vermiculite, mica, volcanic stone,
It is also good to add silica sand, diluted aluminum hydroxide, calciheme carbonate, calcium silicate, etc.

In the present invention, the fiber materials include various fiber materials other than asbestos, including inorganic fibers such as rock wool and glass fiber;
Various natural organic fibers such as pulp, linen, cotton, wool, silk, polyester, polyamide, polyimide,
Various organic synthetic fibers such as polyvinyl chloride, polyurethane, polyolefin, vinylon, polyacrylon, 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 2ma or more15
The thickness is preferably within mm, and preferably 3 mm or more and 10+++ m or less.

If the fiber length is less than 2 mm, it will easily break under its own weight when it is in the form of a string, and long fibers with a length of 15 mm or more will make kneading work extremely difficult. The amount of the fiber material added is 0.2 to 25 parts by weight, preferably 0.5 to 15 parts by weight. If the fiber material is less than 0.2 parts, it will tend to tear under its own weight when made into a string, and if it is more than 25 parts by weight, it will be difficult to knead. Not only that, but the fire resistance also decreases.

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

Water-soluble cellulose derivatives such as OMC, l'vlc, HEC, HPC, proteinaceous substances such as alginic acid, gum arabic, gelatin and casein, polyvinyl alcohol,
polyethylene oxide, polypropylene oxide,
Polyacrylic acid, polymethacrylic acid, water-soluble polyester, water-soluble polyepoxy compound, ketone formaldehyde resin, polyvinylpyrrolidone, polyamine, Yumine formaldehyde resin, melamine formaldehyde resin,
These include phenol formaldehyde resin, starch and its derivatives.

The amount of water-soluble polymer material added is 0.05 parts by weight or more and 1.0 parts by weight.
It is within the range of 0.1 part by weight to 0.6 parts 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 tube will be insufficient, and if it is more than 1.0 part by weight, it will be difficult to form the fiber material into a string by rolling it on a flat plate. , the work becomes impossible due to interference from the wires adhering to hands and boards.

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.

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 described 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 s,okg silicon
Sand 25 Dolomite plaster 15 Slaked lime 10 Nylon fiber (5 denyl, 5 mm length) 008 Methyl cellulose 0025 This blend 2.
0 kg was taken and kneaded in a kneading bowl while adding water little by little. When 0.65 kg of water was added, the material had an appropriate softness, so it was rolled evenly on a board while applying pressure by hand to form a string with a diameter of about 1.5 CTL and a length of 35 α. This thing was strong enough to be hung by one end. Wrap this sticky material around the joints of straight pipes and joints of drainage pipes made of hard polyvinyl chloride pipe as the inner pipe and lightweight concrete reinforced with alkali-resistant glass fiber as the outer pipe, and press by hand. At the same time, using a trowel, it was finished into a belt shape with a thickness of about 5 mm and a width of about 30 mm, and was then given natural curing. 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 5.0 kg silicon
Sand 25 Calcium Carbonate 25 Vinyl fibers (io denier, 6 mm length) 0.2 were wound around it, which was easy and did not cause any abnormality even after one month of construction.

Reference Example 1 A heating test was conducted for 2 hours in accordance with JISA1304 (fire resistance test method for building structural parts) for the products of Examples 1 and 2, one month after construction, but cracks etc. were found in the joints. No abnormalities were observed.

Comparative Example 1 A joint material was blended using the same recipe and operation as in Example 1, except that 0.1-2 kg of methyl cellulose had the same composition as in Example 1. When I tried to roll this mixture by adding water and rolling it on a board, it stuck to my hands and I could not make it into a string.

A joint material was blended using the same recipe and operation as in Example 1, except that the crushed methyl cellulose was used at 0.001k17.

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 did not withstand the actual construction of joints.

Patent applicant: Showa Denko Co., Ltd. Agent Sei Kikuchi

Claims (1)

[Claims] A multilayer tubular structure made of 0.2 to 25 parts by weight of a fibrous material with a length of 2 to 15 mm, excluding asbestos, and a water-soluble polymer material to 100 parts by weight of a fire-resistant inorganic material including a hydraulic inorganic material. #A rare joint filling material.