JP3369095B2 - Mixing unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing unit. More particularly, the present invention relates to a mixing unit for mixing a two-liquid type coagulant used immediately in a tunnel construction or the like immediately before injection, and more particularly to a mixing unit capable of greatly reducing pressure loss. 2. Description of the Related Art Conventionally, in an auxiliary construction method for tunnel construction, a hollow pipe-shaped rock bolt or a perforated steel pipe is inserted into a hole formed in a rock (ground mountain) in order to prevent falling. Then, a two-pack type rock consolidating chemical solution composed of a urethane foam resin, a so-called silica resin resin (a resin containing silicon dioxide), or the like is injected thereinto to consolidate the hole and the surrounding ground. Is being done. [0003] The above two-packed rock consolidation chemical liquid is fed separately from the injection machine through a hose in a separate form via a hose, joined at a tip of the hose by a mixing unit, and then connected to a downstream hollow pipe or injection pipe. The mixture is mixed and stirred in a tube for use, and finally ejected from the nozzle into the rock (ground). As shown in FIG. 3, the conventional mixing unit is formed of a T-shaped cheese (T-shaped tube), and a hollow main body 21 has two inlets 22 and 23 facing each other. A T-shaped merging portion 24 is formed substantially at the center of the inside of the main body 21, and a single outlet 2 is formed at a portion of the main body 21 that branches off from the merging portion 24.
5 are formed. In the mixing unit shown in FIG. 3, 90 ° elbows 26 and 27 which are bent at substantially 90 ° are screwed to the inlets 22 and 23, respectively. Further, a coupler 28 or a nozzle for connecting a hose or the like is screwed to the discharge port 25. However, in the conventional mixing unit, the two liquids of the rock-solidifying chemical liquid collide with each other substantially at the junction 24 inside the main body 21 made of T-type cheese, and merge. Thereafter, the mixed liquid changes its direction by 90 ° and heads toward the discharge port 25, so that a large pressure loss occurs.
Therefore, it is necessary to increase the injection pressure. Further, when the 90 ° elbows 26 and 27 are fitted into the inlets 22 and 23, a large pressure loss occurs at the 90 ° elbows 26 and 27, so that the injection pressure needs to be further increased. Further, in the conventional mixing unit,
The two liquids are partially mixed and agitated by substantially colliding with each other inside the T-shaped junction 24. Therefore, when the solidification time of the chemical solution is short, such as in summer, there is a problem that the chemical solution solidifies in the mixing unit and the discharge port 25 is closed. This problem has hindered the injection work, increased the number of mixing units used, and caused economic problems. The present invention has been made to solve such a problem, and an object of the present invention is to provide a mixing unit capable of greatly reducing pressure loss. Another object of the present invention is to provide a mixing unit capable of suitably preventing a discharge port from being blocked. [0010] mixing unit of the invention To achieve the above object, according a mixing unit for mixing the two-liquid mixing type of coagulant used in tunnel auxiliary method to injection immediately before, hollow body A mixing unit in which two inlets and one outlet are formed, and a portion extending to the two inlets in the merging portion inside the main body is substantially U
Exhibits a shape, the confluence portion of the internal body, along said axial direction through the discharge port partition plate is provided, the length protruding within said merging portion of the partition plate, at about 10~50mm It is characterized by having. Next, the mixing unit of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory sectional view showing an embodiment of the mixing unit of the present invention, and FIG. 2 is an explanatory sectional view showing a reference example of the mixing unit of the present invention. The mixing unit shown in FIG. 1 has two inlets 2 and 3 and one outlet 4 in a hollow main body 1.
Are formed in the main body 1, and a joining portion 5 is formed in the main body 1 so that a portion extending to the two inlets 2 and 3 has a substantially U-shape. Further, a coupler 8 for connecting a hose or the like is provided at a discharge port 4 formed at a portion branched from a substantially intermediate position of a substantially U-shaped portion of the junction portion 5.
Alternatively, a nozzle or the like is screwed. The mixing unit shown in FIG. 2 is a Y-type cheese (Y-type tube) in which two inlets 2, 3 and one outlet 4 are formed in a hollow main body 1, and In the inside of the main body 1, there is formed a merging portion 5 in which a portion extending to the two inlets 2 and 3 has a substantially V shape. A coupler 8 or a nozzle or the like for connecting a hose or the like is screwed into the discharge port 4 formed at a portion branched from a substantially intermediate position of a portion extending in a substantially V-shape of the merging portion 5. The mixing unit shown in FIGS.
In the confluence part 5 inside, the part extending to the two inlets 2 and 3 has a substantially U-shape or a substantially V-shape, so that a chemical solution flows from the two inlets 2 and 3. Resistance during mixing and stirring can be reduced, and as a result, pressure loss can be significantly reduced. The main body 1 is made of metal, resin, or the like, and the opening angle θ of the merging portion 5 (see FIG. 2) is set to an acute angle in consideration of the resistance at the merging and the size of the mixing unit main body. Is preferred. In the example shown in FIG. 2, the two inlets 2 and 3 of the main body 1 are screwed with obtuse angled elbows 6 and 7 which are bent at about 135 ° or more. As compared with an elbow (for example, portions indicated by reference numerals 26 and 27 in FIG. 3), the pressure loss in the elbow can be significantly reduced. On the other hand, as shown in FIG. 1, if the merging portion 5 has a substantially U-shaped portion, Ru can be omitted the obtuse angle of the elbow 6,7. Further, a partition plate 9 is provided along the axial direction passing through the discharge port 4 at the junction 5 inside the main body 1 shown in FIGS.
Is provided. This partition plate 9 allows the introduction port 2,
The two liquids introduced from 3 are connected to the discharge port 4 inside the junction 5.
To a state immediately before the discharge, and merged at the time of the discharge, it is possible to reduce the pressure loss due to the pressurized feeding of the two liquids. In addition, the two liquids are prevented from converging inside the merging section 5 by using the partition plate 9, thereby preventing the two liquids from reacting and solidifying in the mixing unit. The problem can be solved and the number of mixing units used can be reduced. If the length L (see FIG. 2) of the partition plate 9 protruding into the merging portion 5 is about 10 to 50 mm, the two liquids are not mixed inside the merging portion 5 and are discharged. This is preferable because it can be merged at a good timing (immediately after the discharge port 4 is exited). The partition plate 9 can be made of iron, resin, or the like. For example, a cut is made in a part of the main body 1, the partition plate 9 is inserted into the cut, and then the partition plate 9 is welded to the main body. 1 and is provided inside the main body 1 by closing a cut or the like. The combination of the two liquids to be mixed and stirred in the mixing unit of the present embodiment is appropriately selected from the combination of the two liquids which are components of the conventionally used two-pack type rock solidifying chemical liquid. For example, in addition to the combination of the urethane foam resin and the silica resin resin described above, a combination of a two-pack type resin such as an epoxy resin or a two-pack cement system may be selected. Further, an example of using the mixing unit of the present invention will be described. First, a component (A) composed of an aqueous solution of an alkali silicate, a component (B) composed of an organic polyisocyanate compound, having a molecular weight of 120 or more and a nitrogen atom number of 2
Proportional blending that can control the injection amount, pressure, blending ratio, etc. of the component (C) comprising the water-soluble aliphatic tertiary amine or the water-soluble alicyclic tertiary amine and the component (D) comprising the polyol component. (A)
A mixture of the components (C) and (D); and (B)
The components are put into separate tanks, and rock bolts or injection rods with holes are passed through predetermined places (for example, a plurality of holes drilled at intervals of about 0.5 to 3 m) such as rock, and then the present embodiment is performed. Each component in the tank is mixed and stirred and injected into a lock bolt or an injection rod at an injection pressure of about 0.5 to 50 kg / cm ² · G using a mixing unit of the form (1). Thereby, a predetermined amount of the component (A),
A mixture of the component (C) and the component (D) is uniformly mixed with the component (B), and the mixture is injected into a predetermined unstable bedrock or a ground portion, hardened, solidified or sealed, and stabilized. be able to. According to the present invention, a conventional T-shape is adopted by employing a branch pipe in which a portion extending to two inlets in a merging portion has a substantially U-shape or a substantially V-shape. Pressure loss can be significantly reduced as compared with cheese. Further, if a partition plate is provided at the junction of the main body, reaction-solidification of the two liquids in the mixing unit can be prevented. As a result, the problem of blockage of the discharge port can be solved, and at the same time, the number of mixing units used can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory sectional view showing one embodiment of a mixing unit of the present invention. FIG. 2 is an explanatory sectional view showing a reference example of the mixing unit of the present invention. FIG. 3 is a sectional view of a conventional mixing unit. [Description of Signs] 1 Main body 2, 3 Inlet 4 Discharge port 5 Merging section 6, 7 Elbow 9 Partition plate

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Keisuke Nakagaki               1-3-3 Kamimaezu, Naka-ku, Nagoya City, Aichi Prefecture               No. Catex Inc. (72) Inventor Takeshi Fujiwara               Takeokadai, Nagaokakyo-shi, Kyoto 2F2-304                (56) References JP 4-49640 (JP, B2)

Claims (1)

(57) [Claims] 1. A mixing unit for mixing a two-liquid mixing type coagulant used in a tunnel assisted construction method immediately before injection, and has two inlets in a hollow main body. And a mixing unit in which one discharge port is formed, wherein a part extending to the two introduction ports has a substantially U-shape in a merging part inside the main body, and a merging part inside the main body has A partition plate is provided along an axial direction passing through the discharge port, and a length of the partition plate protruding into the merging portion is 10 to 10.
A mixing unit that is about 50 mm.