KR100761712B1 - Silicate resin foam composition for solidifying weak ground - Google Patents

Abstract

A silicate resin foam composition for solidifying soft ground is provided to improve permeability, ground-reinforcing effect, waterproofing effect and flame resistance, to shorten a time need for curing, and to reduce the manufacturing cost. A silicate resin foam composition for solidifying soft ground comprises: part A comprising 85-93 wt% of special sodium silicate, 2-10 wt% of a polyol having a molecular weight of 500-1,000, 2.0-3.0 wt% of diethanolamine as a crosslinking agent, 0.8 wt% of dibutyltin dilaurate as a resin-forming catalyst, 1.0-2.0 wt% of a polyether-modified silicone surfactant, and 1.2 wt% of dimethylcyclohexylamine as a saturation catalyst; and part B comprising a prepolymer derived from 80 wt% of diphenylmethane diisocyanate and 10 wt% of a polyol having a molecular weight of 1,500-2,000, 5 wt% of trichloropropyl phosphate as a flame retardant, and 5 wt% of dibutyl phosphate as a viscosity reducing agent.

Description

Silicate resin foam composition for solidifying weak ground

The present invention relates to a soft ground silicate resin foam (SRF) chemical composition for solidification, and more particularly, to a silicate resin foam chemical composition for maximizing the ground and rock reinforcement efficiency compared to conventional cement-based chemicals.

In the current situation where the use of underground space is gradually expanded due to the development of the industrial society, the case of constructing a tunnel by the new Austrian Tunneling Method (NATM) among the temporary construction methods of other underground spaces such as subways, electric power stations, communication stations, etc. Is gradually increasing.

Fundamentally supporting the tunnel is the surrounding base, and in order to take advantage of the supporting functions possessed by the surrounding base, always pay attention to the relationship between the base stress and the strength generated by excavation. The generated stress is determined by the inherent properties of the base such as the initial stress and the side pressure coefficient of the base, the cross-sectional shape of the tunnel, the excavation method, and the excavation method. If it is determined that the strength of the surrounding ground is greater than the generated stress, the supporting member should be designed to the extent to secure the safety during construction, and if the ground strength is less than the generated stress, the supporting member, the cross-sectional shape and the construction method should be applied. After careful consideration, design and construction should be carried out to prevent the strength degradation and stress concentration of the base.

In general, water glass-based and cement-based suspensions have been applied as ground reinforcing auxiliary methods of the splitting method. In particular, the cement suspension method is widely used for the purpose of enhancing the ground strength. Although the cement suspension method is low cost and guarantees a certain strength, it is hard to expect the effect on the soft ground because of the long curing period, low order effect and large load, causing problems during penetration.

In such soft ground conditions, steel pipe multi-stage injection method and urethane chemical injection method are widely used.

Steel pipe multi-stage injection method has good effect of strength increase and load reduction, but it is inferior in order effect and it is very disadvantageous to fit air because process required for reinforcement has a great effect on excavation process. Almost unanticipated, the scope of application is very limited.

In addition, the recently used LW (Lables Wasser Glass) chemical injection method and the SGR (Space Grouting Rocket System) chemical injection method have been developed by focusing on the phenomenon that gel is mixed when water glass chemical and cement suspension are mixed. As it does not cause waste of materials, the material cost and construction cost are low, but large-scale facilities are required, and other complex mechanical facilities such as boring machines need to be installed at the perforations, and the integrity of variable ground such as fine sand or clay layers Due to the great influence of groundwater on the characteristics, there is a disadvantage in that the planned construction is difficult.

In addition, currently known polyurethane injection method (hereinafter referred to as urethane method) is a rock solidified method (PUIF) began to be constructed from the 1990s.

In the urethane method, the injection bolts are inserted after drilling at regular intervals in the soft strata, crushing zones, and fault zones, and a joint is developed by applying a pressure of about 20kg / cm ² by mixing a two-component foamed urethane-based chemical solution into the inserted injection bolts. It is a method to prevent the deformation by supporting the rock loading on the upper part of the tunnel by filling the rock between the rock pins of the rock to form an arch form.

In addition, it is possible to prevent deformation caused by the side arm of the side wall portion, and in particular, since the voids between the arm pieces are completely filled with the urethane chemical, a perfect order effect can be obtained.

The urethane injection liquid used in the conventional urethane method uses the two-component urethane chemical liquid which consists of A liquid which is a hardening | curing agent, and B liquid which is a main body.

In the case of solution A used as the curing agent, a crosslinking agent, a foaming agent, a foaming agent, and a viscosity reducing agent were used in a polyol mixture, and in the case of solution B, diphenylmethane diisocyanate (MDI) polymer was used.

The reaction state is mixed and agitated through a fixed mixer equipped with an isocyanate group (B liquid) of the main material and a polyol hydroxyl group (A liquid) of the hardening material in the injector, and then mixed and injected into a desired site.

Such a conventional urethane chemical has a problem that the chemical composition is quite expensive and economically burdened.

The present invention has been proposed to improve the above problems in the prior art, and to provide a silicate resin foam chemical solution composition excellent in soft ground reinforcement effect by reinforcing the disadvantages of cement-based injector more economical than the conventional urethane injector. There is this.

The present invention for achieving the above object is a soft ground, characterized in that it consists of a special liquid sodium silicate and a polyol, a crosslinking agent, a resination catalyst, a modified silicone foam stabilizer, a saturated catalyst, A liquid, and an isocyanate mixture B liquid containing an isocyanate group. It is characterized by a solid silicate resin foam chemical composition.

Hereinafter, specific examples of the silicate resin foam chemical composition of the present invention will be described.

<Example>

       A liquid production  Content (% by weight)           B liquid manufacturing  Content (% by weight)     Special silicate     85-93  Difetylmethane4-4 'Diisocynate (MDI)     80     Diethanolamine      2 ~ 3           Polyol     10  Dibutyl tin dilaurate      0.8 Trichloropropylphosphate     5 Dimethylcyclohexaamine      1.2       Dibutyl Persulfate     5         Polyol      2 ~ 10    Modified Silicone Foaming Agent      1 ~ 2

The silicate resin foam chemical solution composition for soft ground solidification of the present invention is 1: 1 to 1% by weight of a solution of an isocyanate mixture B including an isocyanate group and a solution of a special sodium silicate (water glass), a polyol, a resin catalyst, and a saturated catalyst. It is formulated to be 1: 1.1.

The content of special sodium silicate contained in the solution A is 85 to 93% by weight, the specifications of the special sodium silicate are 1.35 to 1.45 specific gravity, 10 to 14% by weight sodium oxide, 26 to 30% by weight silicon dioxide, molar ratio 2.0 -2.6, viscosity 70-90 cps is preferred (the rest is water).

If the content of the material contained in the solution A range is less than the value of the product does not react due to crosslinking, if the value is exceeded, the phenomenon that the product is broken.

The solution A contained 0.5 to 1.0 wt% of inorganic metal catalyst and 1 to 2 wt% of tertiary amine catalyst. The inorganic metal catalyst is a tin-based catalyst, that is, dibutyl tin dilaurate, as a resination catalyst. In this embodiment, the tertiary amine catalyst is preferably a dimethyl cyclonucleamine as a saturation catalyst, and in this embodiment, 0.8 wt% dibutyltin dilaurate and 1.2 wt% dimethyl cyclonucleamine were mixed.

In addition, it is preferable that the liquid A contains 2 to 3% by weight of diethanol amine as a crosslinking material.

If the diethanol amine is not included or the content is less than the numerical value range, the product does not react and does not crosslink. If the numerical range is exceeded, the product quickly hardens.

The liquid A may include a polyol having a molecular weight of about 500 ~ 1,000 as a crosslinking agent, the content is 2 to 10% by weight.

If the molecular weight is not included in the polyol of about 500 ~ 1,000 or if the content value range is less than the product reaction does not cross-linking, if the value range is exceeded, the product is foamed excessively occurs.
The modified silicone foam stabilizer included in the solution A is a polysiloxane (composite silicone) in which the chemical name is modified with polyether.

The isocyanate mixture contained in the solution B is preferably a prepolymer-reacted isocyanate mixture. Specifically, a prepolymer in which diphenylmethane diisocyanate (MDI) is reacted with a polyol is preferable.

The polyol used for the prepolymer reaction has a molecular weight of about 1,500 to 2,000 is suitable, and as a specific component, it is preferable to prepolymer in 10% by weight of polyol to 80% by weight of diphenylmetal diisocyanate.

The liquid B may include a flame retardant and a viscosity lowering agent, preferably 5% by weight of trichloro propylphosphate as the flame retardant, and 5% by weight of dibutyl phosphate as the viscosity lowering agent.

In the present invention silicate resin foam constituting such a composition is injected through the fixed mixer at the tip of the injector of the Y-type pipe through the injector A is mixed with the injection resin is discharged through the hole in the tip of the pipe is installed, the injection resin is soft It penetrates into the ground and quickly cure within 10 minutes.

Hereinafter, the results of the reaction after the reaction of the soft ground solidified silicate resin foam chemical solution tested by the Korea Chemical Testing Institute as follows.

The test method was tested according to KS M 3705 at 25 ° C., specific gravity was tested according to KS M ISO 2811-1, and compressive and flexural strength were tested according to KS M 3809. Table 1 below shows the test result values described above.

Table 1

As shown in Table 1, it can be seen that the silicate resin foam chemical solution according to the present invention hardens to a compressive strength of 300 N / cm 2 or more and a flexural strength of 300 N / cm 2 or more within 10 minutes after penetration into the soft ground. On the other hand, cement-based injectors are hardened to 80 ~ 100 N / ㎠ compressive strength after 3 days after penetration into the soft ground, and thus the compressive strength increases as the curing time is shorter than that of cement-based injectors.

As described above, the chemical liquid composition of the present invention has improved penetration and water shortening than the existing glass-based and cement-based suspension type used as the existing ground reinforcing auxiliary method, and exhibits the effect of shortening the air.

In addition, since it contains low-cost sodium silicate, it is more economical than urethane ground reinforcement, and it is not influenced by water, and has an excellent ordering effect.

In addition, it has a self-extinguishing ability can greatly reduce the risk of fire.

Claims (12)

85 to 93% by weight of special sodium silicate, 2 to 10% by weight of polyol having a molecular weight of 500 to 1,000, 2.0 to 3.0% by weight of diethanol amine as a crosslinking agent, 0.8% by weight of dibutyl tin dilaurate as a resin catalyst, And A liquid which mixes 1.0-2.0 weight% of modified silicone foam stabilizers which modified the polyether, and 1.2 weight% of dimethyl cyclonucleamine which is a saturated catalyst; The prepolymer reacted with 80% by weight of dipanylmethane diisocyanate and 10% by weight of a polyol having a molecular weight of 1,500 to 2,000, and a flame retardant and a viscosity reducing agent, but the flame retardant is mixed with 5% by weight as trichloro propylphosphate, Viscosity lowering agent is a silicate resin foam pharmaceutical composition for soft ground solidification, characterized in that consisting of the isocyanate mixture B liquid mixed with 5% by weight as dibutyl persate. The method according to claim 1, The special sodium silicate contained in the solution A has a specific gravity of 1.35 to 1.45, a sodium oxide content of 10 to 14% by weight, a silicon dioxide content of 26 to 30% by weight, a molar ratio of 2.0 to 2.6, and a viscosity of 70 to 90 cps. Freezing silicate resin foam chemical composition. delete delete delete delete delete delete delete delete delete delete