JPS5857492A - Tunnel-lining interfacial material and lining of tunnel - Google Patents

Abstract

PURPOSE:To enhance processability of interfacial material application and to prevent crack formation, by placing a specified inorg. cold-foamable composition at an interface between natural ground and a lining material or between a timbering material and a lining material. CONSTITUTION:An aq. soln., pH <=1.5, of a water-sol. alkali metal silicate or an acid of ionization constant <=4.0 at 25 deg.C, at least one basic powder selected from alumina cement or a mixture thereof with portland cement and anhydrous alkali silicate, a metal-base foaming agent, and at least one expansion stabilizer selected from silica gel, zeolite, active carbon, carbon black, mica and talc are compounded to obtain a tunnel-lining interfacial material consisting of an inorg. cold-foamable composition. After said composition is applied to natural ground directly or to a surface formed by timbering the natural ground and cured, concrete for lining is placed, cured and hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the lining of tunnels, and in particular to an interface material interposed at the interface between the ground and the rolled lining material, or between the supporting lining material and the rolled P" material, and the interface material. The present invention relates to the tunnel method used.

In tunnel lining, if the rolling lining is performed directly on the surface of the supporting lining material that is located on a convex or hardened mountain structure such as hard rock or medium hard rock, the rolling lining is When the concrete that is the material hardens, the volume of the concrete decreases by adhering to the surface of other piles, supports, and lining materials, which causes cracks to occur. If cracks occur during the lining, the tunnel must maintain the properties that it must maintain, that is, it can withstand loads such as earth pressure over a long period of time, and is durable without erosion due to water leakage or loss of strength. This will have a negative impact on the i/i:vj that must be met. In order to prevent this, it becomes necessary to arrange an interfacial barrier and allow the rolling, covering and concrete to harden independently.

Conventionally, to prevent the occurrence of cracks in rolled concrete, the original purpose was achieved by applying synthetic polymers to the surface of the ground or supporting lining materials using methods such as coating or gluing. Ta. However, this method has drawbacks such as being extremely complicated and time-consuming, posing a fire risk due to the material, being expensive, and having a low crack prevention effect.

The present invention can overcome all the above-mentioned drawbacks. In other words, by applying an inorganic room-temperature foamable composition (hereinafter simply referred to as the foamed material of the present invention) to the surface of the ground or supporting equipment, the workability of construction with an interface can be significantly improved, and the fire prevention It is non-hazardous, inexpensive, and can fully achieve its initial purpose as an interface material.

To explain in more detail below, since the interface material interrupts the interface between another pile and the erected material or between the supporting lining material and the erected lining material, the interface material itself has the same or larger diameter as the concrete. It is undesirable for the concrete to have such strength and adhesion as to prevent cracks from occurring during curing and hardening of the concrete in the rolling process. This 4-mei interface material is a flexible room-temperature foaming composition, and the strength can be freely adjusted by changing the expansion ratio. The functional foam material of the present invention is prepared using the following components A, B, or C. Component A is (a) water-soluble alkali metal silicate, (b) alumina cement or alumina cement and portland cement. (C) a metal blowing agent; and (d) at least one selected from silica gel, zeolite, activated carbon, carbon black, mica and talc.
+4? Component B is an essential component of the foaming stabilizer, and component B is (a') water-soluble alkali metal silica butyrate, (b') agent cement material, (c) metal foam, and (a) '〉Contains as an essential component a component of at least seven foaming stabilizers selected from silica gel, zeolite, activated carbon, carbon black mica, and talc, and component C is (a
'12 to ' pH of an acid whose ionization constant (pKa) at C is 11.0 or less/,! ; (b) anhydrous alkali silicates, at least seven kinds of basic powders selected from cement substances, (C゛) gold; , carbon black, mica, and talc as essential components, and these A, B, and C components may be used as long as they do not interfere with the foam curing reaction and heat resistance at room temperature. In addition to the above-mentioned essential ingredients, gypsum, crushed stone powder, fly ash, silica dust produced by electric heating or legal process, glass fiber, silica fiber, synthetic materials are added for the purpose of improving functionality, filling, increasing density, reinforcing, etc. Appropriate amounts of resins, synthetic rubbers, water-soluble polymers, etc. can be blended as appropriate.The foamed material of the present invention, which is component A, component B, and component C, can be prepared by mixing the components instantly or by simply mixing them. By shaping it into a paste, it is applied to a predetermined ground or the surface of a support fit work material, and used as an interface material.

In the present invention, the above-mentioned foamed material of the present invention is applied directly to a strong ground or to a surface covered with a support lining of the ground. From the viewpoint of workability, it is preferable to use the spraying method 1, which is particularly efficient. When the foamed material of the present invention is used in this construction method, the workability is significantly faster than that of conventional sheet-like materials, the speed is 1 to 10 times higher, there is no risk of fire, and the cost is reduced. It can also be finished at a fairly low cost, and its adhesion and hardness are such that it does not affect the curing of rolled 61° econcrete. Therefore, it can sufficiently function as an interface material for tunnel leopard construction.

Examples are shown below.

Example/An inorganic room-temperature foamable composition is divided into components (a) and (b) and prepared as follows.

(a) Component sodium silicate aqueous solution (Sj02/ Na201 and 202
S1 solid content 4 to weight $) roo parts by weight (b) component alumina cement 251 carp metal aluminum 3 parts by weight Prepare a paste obtained by mixing and stirring the above components (a) and (b),
Spray painting was quickly applied to the surface of the supporting lining made of shotcrete using a pressure gun. The coating thickness of the foamable composition at this time was 3:Iim, and the foaming ratio was 3 times. Adhesion strength of cured diameter Test method J according to the provisions of JISA 69.09
was 2.0 kgf/cm, and the rupture condition during the test was internal rupture. Concrete for the rolling lining was poured between the interface material after the foam had hardened and the statue formwork, and was allowed to cure and harden. After several months, no cracks were observed on the lining surface.

Example! The foamed material of the present invention is divided into components (a) and (b) and adjusted as follows.

(a) Ingredients Sodium silicate water bath solution (5102/Na2O.

MoJl, ratio J, jX solid content 407Ji amount%) foo
miJlfaE (b) Component Portland cement 25 parts Metal aluminum 3 parts by weight Zeolite
6 parts by weight -] A paste obtained by mixing and stirring the components (a) and (b) in Part 2 was prepared, and quickly sprayed on the surface of the supporting lining made of shotcrete using a pressure feeder. . At this time, the foamable composition had a NI''J thickness of 3 mm and a foaming ratio of !, etc. The adhesion strength after curing was 2.3 kgf/cm, and internal breakage occurred. There is a roll between the foam hardening 41z interface material and the molding formwork.
', j'Vj Concrete was poured and cured to harden. / No cracks were observed on the surface of the speculum of the diameter.

Example 3 The foamed material of the present invention is prepared as follows.

Dilute salt soup roo parts by weight Sodium silicate cullet (St 02/Na2O, molar ratio 3.2)
100 parts by weight metal aluminum
3 parts by weight activated carbon
5 parts by weight of the mixture was mixed and stirred, and quickly sprayed onto the surface of the supporting lining material made of shotcrete using a pressure feeder. At this time, the coating pressure of the foamable composition was B and the expansion ratio was 30.2 times. The adhesion strength after curing was 7.9. Concrete for the rolling lining was poured between the foamed and hardened interface material and the lining formwork, and the material was cured and cured. After 1 month, no cracks were observed on the lining surface.

(that's all) Patent applicant Shikoku Kaken Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] / An interface material for 1-wall processing comprising an IgH-free room-temperature foamable composition as a main foaming component. 2. The inorganic room-temperature foaming composition comprises (a) a water-bathable alkali metal silicate, (b) a mixture of alumina cement or portland cement, (C) a metal foaming agent, and (d) silica gel, zeolite, and activated carbon. The interface material for tunnel construction as claimed in claim 1, comprising at least seven foaming stabilizers selected from carbon black, mica, and talc. 3. The inorganic room-temperature foamable composition contains (a') water-bathable alkali metal silicate, (b') cement barrel, (c') gold jI
2. The tunnel lining interface material according to claim 1, comprising a 4-based foaming agent and (d') at least seven foaming stabilizers selected from silica gel, zeolite, activated carbon, carbon black, mica, and talc. Ge, the inorganic room temperature foamable composition is (a')2! ; pH of an acid whose ionization constant (pKa) at °C is 0 or less;
-! ; Aqueous solution under LJ, (b') anhydrous alkali silicate,
A patent comprising at least seven basic powders selected from cementitious substances, (c4) a metallic foaming agent, and (d') at least seven foaming stabilizers selected from silica gel, zeolite, carbon black, activated carbon, mica, and talc. The interface material for tunnel lining according to claim 1. 3. In the lining of L-tunnels, an inorganic room-temperature foamable composition is interposed at the interface between the other pile and the lining lining material or between the supporting lining material and the lining material. A tunnel lining method characterized by: &-@tV4 The tunnel lining method according to claim 5, wherein the testing method for the constantly wet and foamable composition is a spraying method.