JPS6360181A - Heat insulation enhancement for hollow structure - Google Patents

Abstract

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

Description

[Detailed description of the invention] Industrial applications The present invention applies to aerated concrete fillings. The present invention relates to a method for reinforcing insulation of a hollow structure.

Conventional technology When making a table using veneer plywood, a hollow panel is made using decorative plywood for the upper surface and non-decorated plywood for the lower surface, and gunboard paper with a honeycomb-shaped cross section is inserted into the hollow part of the panel. A method is used in which the reinforcing material is interposed and bonded and integrated. Alternatively, when manufacturing metal rain shutters, etc., a method is used in which a hollow metal panel is filled with foamed polystyrene or the like in order to provide sound insulation, heat insulation, vibration damping, strength, etc.

The former method of filling the honeycomb-shaped gun balls involves cutting the cardboard to match the hollow gap size and then gluing it together with an adhesive, which is time-consuming and inefficient. Furthermore, the latter method of filling with expanded polystyrene also has the disadvantages of being labor-intensive and lacking in fire resistance and fire resistance.

Structure of the Invention The purpose of the present invention is to address the above-mentioned circumstances and to disclose a novel method that can extremely easily form a heat insulating reinforcement even in a structure such as an aluminum sash frame where the middle part is uneven. The gist is that a kneaded product obtained by adding to cement an aqueous solution containing calcium chloride as a main ingredient and at least one of iron salts, potassium salts, and ammonium salts as an auxiliary agent, A method for adiabatic reinforcement of a hollow structure, characterized in that a slurry-like cement mixture containing air bubbles obtained by uniformly mixing air bubbles foamed using a foaming agent is flowed into the hollow structure and solidified. It is in.

This will be explained in detail below.

Examples of the cement used in the method of the present invention include solid Portland cement, white Portland cement, and mixed cement such as silica cement. A mixture of one or more of these or two or more of these in an appropriate ratio is mixed with calcium chloride as the main ingredient and one or more of iron salts, potassium salts, and ammonium salts as auxiliary agents, preferably salts of these three types in water. Add an aqueous solution obtained by dissolving it in and knead it to make it fluid. The compounds used as the above-mentioned auxiliary components include ferrous salts, ferric salts, sulfates,
Chloride etc. are used. Examples of the anionic groups constituting potassium salts and ammonium salts include sulfate ions, carbonate ions, and chloride ions. Such an aqueous salt solution is used by dissolving 1 to 3 types of auxiliary agents in water for calcium chloride as a main ingredient.The amount of auxiliary agents used is 100 parts by weight of calcium chloride. 2 to 15 parts by weight as iron salts such as iron sulfate and iron chloride,
It is preferable to use 1 to 9 parts by weight of potassium salts such as potassium carbonate and potassium chloride, and 0.3 to 5 parts by weight of ammonium salts such as ammonium chloride and ammonium sulfate.

Usually, about 15 to 40 times the total weight of these main ingredients and auxiliary agents is added to form a homogeneous aqueous solution, which is then added to cement and kneaded into a highly fluid slurry. The dilution concentration of salt H1& and its aqueous solution affects product strength, curing time, durability,
It is related to water resistance etc. The slurry-like cement mixture thus obtained is foamed using a foaming agent mainly composed of animal proteins such as extracts from the hooves of cows and horses, and other commonly used foaming agents. Evenly mix the fine air bubbles that are almost cream-like. The amount of foam added is
It is determined as appropriate, taking into consideration the strength, specific gravity, etc. required of the filling. The cement slurry mixed with air bubbles is injected into the hollow part of the frame of a panel-like structure or aluminum sash, and the like to be filled. The filling progresses in hardening within a few hours, and becomes a strong foamed concrete filling after 10 to 20 hours. If fluidity may be impaired due to the structure of the hollow structure when injected into the hollow structure, iron powder or other aggregates may be mixed with the cement in advance, and the characteristics of the aggregates, for example, in the case of iron powder, may be mixed with the cement. It is also possible to impart properties such as improved sound insulation to the filling.

Effects According to the present invention, compared to conventional methods, hollow structures can be reinforced with fillers in a much shorter period of time and with simpler operations, and furthermore, hollow structures with complex shapes, which were conventionally not economically possible, can be reinforced with fillers. It can also be easily adapted to the body. Moreover, since the formed bubble filler is inorganic, it does not generate toxic gas even in the event of a fire, and is far superior in terms of durability compared to conventional gunboard or styrofoam. In addition, in terms of production, as in the production of conventional foamed concrete moldings, it is possible to
Since it does not require long-term heat treatment with high-temperature steam of 80°C or higher, it can be applied to materials that are not heat resistant, such as plastic products and aluminum sash frames that are easily deformed or dimensionally distorted by heat treatment. Moreover, it can be filled at low cost. The filling of the present application is fl! In addition to being highly heat insulating, strong and adhesive, the specific gravity can be adjusted at will, giving hollow structures various properties such as soundproofing, anti-vibration, water resistance, and fire resistance. Can be done.

An example is given below.

〔Example〕

Mix 200 kg of white Portland cement and 10 kg of silica cement in a cement mixer, add 17 kg of calcium chloride, 0.7 kg of ferrous sulfate, 0.4 kg of potassium carbonate, 0.2 kg of ammonium chloride, and 460 liters of water. Add 100 kg of the dissolved liquid and knead to form a slurry.Add 830 liters of fine air bubbles obtained by whipping a foaming agent to this, mix, and inject into a hollow panel made of plywood and harden.At room temperature. It hardened in about 6 hours and reached practical strength after 24 hours.

With the above amount, the hollow part of 1113 could be filled. Note that the apparent specific gravity of the foam molded product was approximately 0.1.

Claims (1)

[Claims] (1) Cement with calcium chloride as the main ingredient, iron salt,
A foam-containing cement kneaded product obtained by uniformly mixing air bubbles caused by a foaming agent into a kneaded product obtained by adding an aqueous solution containing at least one of potassium salts and ammonium salts as an auxiliary agent, is formed into a panel shape. A method for reinforcing insulation of a hollow structure, which method comprises injecting into a hollow structure having a columnar or other arbitrary external shape and solidifying it.