JP6162569B2 - Mixing unit and manufacturing method thereof - Google Patents

Description

  The present invention relates to a mixing unit and a manufacturing method thereof.

  Conventionally, when excavating a tunnel, an auxiliary method has been used to reinforce the ground in front of the face (front face). As shown in FIG. 7, in this reinforcing method, a plurality of steel pipes 100 each having discharge holes (not shown) formed at a predetermined pitch are connected in a long shape. Then, a plurality of steel pipes 100 are driven on the face 20 at a predetermined pitch. A mirror concrete 30 is placed on the face 20 so as to cover it. And it is as follows when the placement of a steel pipe is explained in detail. First, a drill rod (not shown) having a rod bit (not shown) at the tip is inserted into the steel pipe 100. And after connecting a rod bit and the steel pipe 100 in the front-end | tip of the steel pipe 100, the steel pipe 100 is driven in a face. After the steel pipe 100 is driven on the face in this way, the drill rod is recovered.

  Thereafter, when the chemical liquid 40 for rock mass consolidation is injected into the steel pipe 100, the chemical liquid flows out from the inside of the steel pipe 100 to the natural ground through the discharge holes. Thereby, the natural ground is reinforced. The rock consolidation chemical used at this time is a two-liquid mixed type chemical such as urethane (silica resin) in the illustrated example (hereinafter, the two chemicals to be mixed are referred to as A liquid and B liquid). Therefore, the mixing unit 50 is connected to the rear end portion of the steel pipe 100. The mixing unit 50 is formed so that two injection holes are formed and these flow paths merge, and injection hoses 61 and 62 are connected to the injection holes, respectively. A tank 63 for liquid A and a tank for liquid B 64 are connected to the injection hoses 61 and 62, respectively, and a pump 65 for pumping the chemical liquid is attached in the middle of the injection hoses 61 and 62.

  And in order to mix a chemical | medical solution, the pump 65 is driven and a chemical | medical solution is inject | poured into the mixing unit 50 via each injection | pouring hose 61 and 62 from each tank 63,64. These two chemicals are mixed in the mixing unit 50 and then injected into the steel pipe 100. As such a mixing unit 50, for example, a unit formed in a T-shape shown in FIG. 8 or a U-shape or V-shape in Patent Document 1 shown in FIGS. 9A and 9B is known. Yes.

  By the way, in the above auxiliary methods, since the steel pipe 100 is long (standard is about 12.5 m) and the work place needs to be secured, the position from the installation position of the pump 65 to the top of the steel pipe 100 is required. The distance is long, and it is necessary to increase the injection pressure in consideration of the pressure loss at this distance.

  As described above, various mixing units have been proposed. For example, the mixing unit shown in FIG. 8 has a very large pressure loss because the injected chemical solution collides head-on in the combined flow path. For this reason, when the chemical solution is pumped to the tip of the steel pipe 100, there is a risk that the pressure is not sufficient to reinforce the natural ground by flowing out and penetrating into the surrounding natural ground due to the pressure drop. In order to reduce such pressure loss, Patent Document 1 discloses a mixing unit shown in FIG. As shown in the figure, these mixing units are configured to merge after the chemicals pumped from the two injection holes collide at the partition plate. Thus, the pressure loss is reduced by preventing the chemical liquids from directly colliding with each other.

Japanese Patent No. 3369095

  However, in this configuration, although the chemical solutions do not collide with each other in front, two chemical solutions collide with the partition plate, so that the stagnation occurs at the root position (near the upstream end portion) of the partition plate of the pipeline. For this reason, the flow rate of the injected chemical solution is reduced, which causes a reduction in pressure loss. Further, in this mixing unit, since the two flow paths must be provided equally, the partition plate must be provided with high precision inside the pipe, and there is a problem from the viewpoint of maintaining the processing cost and quality. Therefore, there is still room for improvement in the conventional mixing unit.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a mixing unit that can reduce pressure loss and that is easy to manufacture, and a method for manufacturing the mixing unit.

  The mixing unit according to the present invention is a mixing unit for mixing a two-liquid mixing type liquid chemical used in a tunnel auxiliary method, and is formed as a first flow path and a second flow path formed integrally. And a pipe-shaped first module for connecting the first flow path and the second flow path so as to form an obtuse angle, the connection path connecting both the flow paths. The first flow path, the second flow path, and the connection path connecting the both flow paths are formed integrally, and the connection path is formed in a curved shape and forms an obtuse angle. And the second module that connects the second flow path, the first flow path of the first module, and the first flow path of the second module are connected to be adjacent to each other, and the first module Of the first flow path of the first module and the opening of the first flow path of the second module. Merging path communicating with an end thereof, and a, and a connecting portion.

  In the present invention, a mixing unit is configured by combining two modules formed in a pipe shape. And in each module formed integrally, since a chemical | medical solution is inject | poured from the 2nd flow path to the 1st flow path through the connection part formed in the curve shape, a chemical | medical solution flows into a 1st flow from a 2nd flow path. Smoothly flows into the road. In this way, in the flow path from each module to the combined flow path, the flow of the chemical solution is not significantly hindered and flows smoothly, so that it is possible to prevent pressure loss from occurring. As a result, the mixed liquid can be discharged from the merged pressure at a high pressure. In addition, a partition plate for separating the two flow paths as in the conventional example is not necessary, and a mixing unit is formed by combining two modules formed in a pipe shape in advance, so precise dimensional accuracy is required. Not easy to manufacture.

  In the mixing unit, the connecting portion can have various configurations. For example, it can be formed so as to cover at least a part of the outer peripheral surfaces of the first module and the second module.

  The mixing unit may further include a joint member that is attached to the joint channel formed in the connecting portion and communicates with the first channel of the first module and the first channel of the second module. it can. Thereby, for example, by changing the shape of the joint member, it is possible to adjust the flow rate of the mixed chemical liquid discharged from the combined flow path and to facilitate connection to other members.

  In the mixing unit, an internal thread may be formed on the inner wall surface of the combined flow path, and an external thread to be engaged with the internal thread may be formed on the outer peripheral surface of the joint member. This facilitates the connection between the mixing unit and the joint member. However, the method for connecting the mixing unit and the joint member is not limited to this.

  A method for manufacturing a mixing unit according to the present invention is a method for manufacturing a mixing unit for mixing a two-liquid mixing type liquid chemical used in a tunnel auxiliary method, and is a first flow formed integrally. A pipe having a path, a second flow path, and a connection path connecting the two flow paths, the connection path being formed in a curved shape and connecting the first flow path and the second flow path so as to form an obtuse angle. A first module having a shape, a first flow path formed integrally, a second flow path, and a connection path connecting the both flow paths, the connection path being formed in a curved shape. A step of preparing a pipe-shaped second module that connects the first flow path and the second flow path so as to form an obtuse angle, and the first and second modules in which the first flow paths are adjacent to each other Cover at least part of the outer peripheral surface of both modules Binding and has a combined channel which ends in communication with the first flow path end and the second module of the first flow path of the first module, and a, a step of forming the connecting portion.

  In the mixing unit manufacturing method, in the step of forming the connecting portion, the connecting portion can be formed by aluminum die casting. Thereby, even if a connection part is a complicated shape, it can manufacture easily.

  According to the present invention, it is possible to reduce pressure loss and to manufacture easily.

It is the top view (a), front view (b), and side view (c) of one Embodiment of the mixing unit which concerns on invention. It is a front view which shows the state in which the joint member was attached to the mixing unit of FIG. FIG. 3 is an exploded sectional view of FIG. 2. It is a figure which shows a part of manufacturing method of the mixing unit of FIG. It is a figure which shows the usage method of a mixing unit. It is the schematic which shows the injection | pouring method of the chemical | medical solution in case a steel pipe is long. It is a figure which shows the outline | summary of the reinforcement work of a tunnel. It is sectional drawing which shows the conventional mixing unit. It is sectional drawing which shows the conventional mixing unit.

  Hereinafter, an embodiment of a mixing unit according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view (a), a front view (b), and a side view (c) of a mixing unit according to the present embodiment, and FIG. 2 is a front view showing a state in which a joint member is attached to the mixing unit of FIG. 3 is an exploded cross-sectional view of FIG. Hereinafter, for convenience of explanation, the upper direction in FIG. 1B may be referred to as “first” or “downstream”, and the lower direction may be referred to as “rear” or “upstream”.

<1. Mixing unit structure>
As shown in FIGS. 1 to 3, the mixing unit 10 includes a pipe-shaped first module 1 and a second module 2, and an aluminum die cast part 3 is formed on the outer peripheral surfaces of these modules 1 and 2. It consists of Thereby, this mixing unit 10 is formed in Y shape as a whole. Further, in the mixing unit 10, a joint member 4 is attached to the combined flow path of both the modules 1 and 2. Hereinafter, each member will be described.

  First, the first module 1 will be described. The first module 1 and the second module 2 have substantially the same configuration, and are different only in that they are formed in line symmetry. Therefore, in the following, the first module 1 will be mainly described, and the description of the second module 2 will be the minimum necessary. The first module 1 includes a first flow path 11, a second flow path 12, and a third flow path 13 that all extend linearly, and a curve connecting the first flow path 11 and the second flow path 12. A first connection path 14 having a shape, a second connection path 15 having a curved shape for connecting the second flow path 12 and the third flow path 13 are provided, and these are integrally formed. Here, the second flow path 12 is formed longer than the first flow path 11. The first flow path 11 and the second flow path 12 are connected via the first connection path 14 so as to form an obtuse angle. Thereby, the 1st channel 11 and the 2nd channel 12 are connected via a smooth curve.

  On the other hand, the second flow path 12 and the third flow path 13 are connected so as to form an obtuse angle via the second connection path 15, but the second connection path 15 sandwiches the second flow path 12. The first connection path 14 is bent on the opposite side. Thereby, the 1st flow path 11 and the 3rd flow path 13 are formed so that it may become parallel. Thus, the second flow path 12 and the third flow path 13 are connected via a smooth curve. As described above, in the first module 1, the three linearly extending flow paths 11 to 13 are smoothly connected via the two connection paths 14 and 15.

  The second module 2 is also formed in the same manner as the first module 1, and both the modules 1 and 2 are arranged so that the first flow paths 11 and 21 are adjacent to each other and extend in parallel. Thereby, both the modules 1 and 2 are such that the first flow paths 11 and 21 are bound, the second flow paths 12 and 22 extend away from each other, and the third flow paths 13 and 23 extend in parallel. .

  Next, the aluminum die cast part 3 will be described. The aluminum die cast part 3 is formed by forming aluminum so as to cover the outer peripheral surfaces of the first and second modules 1 and 2. More specifically, the aluminum die cast part 3 is formed around the first region 31 and the second channels 12 and 22 formed around the first channels 11 and 21 of the modules 1 and 2. The second region 32 and the third region 33 formed around the third flow paths 13 and 23 are configured. The first region 31 is formed in a cylindrical shape so as to cover the periphery of the two first flow paths 11 and 21, and further extends to the tip side beyond the flow paths 11 and 21. A concave joint channel 311 is formed on the tip side of the first region 31. The combined flow path 311 is formed in a cylindrical shape, and the first flow paths 11 and 21 of the modules 1 and 2 are connected to the back end face thereof. That is, the first flow paths 11 and 21 are open at the back end face of the combined flow path 311. An internal thread is formed on the inner wall surface of the combined flow path 311.

  The second region 32 is formed so as to cover the outer peripheral surfaces of the second flow paths 12 and 22 of the modules 1 and 2. That is, there are two second regions 32. Also, two third regions 33 are provided and formed so as to cover the outer peripheral surfaces of the third flow paths 13 and 23. A flange portion 331 that protrudes in the radial direction is formed in the vicinity of the second coupling paths 15 and 25 on the outer peripheral surface of the third region 33, and a male screw 332 is formed on the outer peripheral surface on the rear end side of the flange portion 331. Has been. Thus, the openings on the rear end side of the third flow paths 13 and 23 form an injection hole for injecting the chemical liquid for consolidation, and in order to make it easy to connect the injection hose to the injection hole, Each third region 33 of the cast part 3 is formed as described above. Thus, the aluminum die cast part 3 is formed in a Y shape so as to cover the outer peripheral surfaces of the first and second modules 1 and 2 in general.

<2. Structure of joint member>
Next, the joint member 4 will be described. As shown in FIGS. 2 and 3, the joint member 4 includes a tip connection portion 41, a support portion 42, a flange portion 43, and a rear end connection portion 44 that are all formed in a cylindrical shape, and are connected in this order. It is constituted by. The tip connection portion 41, the support portion 42, and the flange portion 43 have a diameter that increases in this order. The tip connection portion 41 is configured to be inserted and connected to a coupler or the like. As will be described later, the support portion 42 is for forming a recess between the coupler and the flange portion 43, and the flange portion 43 comes into contact with the tip surface of the aluminum die cast portion 3. A rear end connecting portion 44 having a diameter larger than that of the support portion 42 and smaller than that of the flange portion 43 is coupled to the rear end portion of the flange portion 43. The rear end connection portion 43 is formed to have a diameter that can be inserted into the combined flow path 311 of the aluminum die cast portion 3, and a male screw that can be screwed into the female screw 312 of the combined flow path 311 is formed on the outer peripheral surface thereof. Yes. And the through-hole 45 extended in an axial direction is formed in the inside of these four site | parts.

<3. Manufacturing method of mixing unit>
The mixing unit 10 can be manufactured by aluminum die casting as follows. First, a mold (not shown) having a cavity corresponding to the outer surface of the aluminum die cast part 3 is prepared. Next, as shown in FIG. 4, the first and second modules 1 and 2 are arranged in the cavity of the mold. At this time, it arrange | positions so that the 1st flow paths 11 and 21 of each module 1 and 2 may adjoin in parallel, and the 2nd flow paths 12 and 22 may extend in the mutually opposite side. That is, the two modules 1 and 2 are arranged in a Y shape. Following this, molten aluminum is poured into the mold, and the aluminum die cast part 3 is formed. In addition, in the example of illustration, although the external thread part 332 is formed in each 3rd area | region 33 of the aluminum die-cast part 3, the external thread part 332 is shape | molded simultaneously by die-casting or threaded by separate cutting. Alternatively, other shapes that can be jointed with the one-touch joint may be exhibited.

<4. How to use the mixing unit>
Next, the usage method of a mixing unit is demonstrated, referring FIG.5 and FIG.7. FIG. 5 shows how to use the mixing unit. First, a sealing tape member is wound around the outer peripheral surface of the rear end connecting portion 44 of the joint member 4 and screwed into the combined flow path 311 of the mixing unit 10. As a result, the seal member bites into the gap between the external thread of the rear end connection portion 44 and the internal thread of the combined flow path 311, and both are connected in a liquid-tight manner. Subsequently, as shown in FIG. 5, the coupler 200 is fixed to the tip connection portion 41 of the joint member 4. As shown in FIG. 7, a coupler 200 is connected to the rear end portion of the steel pipe 100 inserted into the tunnel excavation hole. Following this, injection hoses 61 and 62 for chemical liquids are connected to the respective injection holes of the mixing unit 10. Each injection hose 61, 62 is screwed into the male screw part 332 of the third region 33.

  Next, the pump 65 is driven, and the A liquid and the B liquid are respectively pumped to the injection hole of the first module 1 and the injection of the second module 2. These A liquid and B liquid pass the 1st module 1 and the 2nd module 2, respectively, merge in the joint member 4 arrange | positioned at the combined flow path 311, and are mixed. Then, the mixed liquid is injected into the steel pipe 100 through the coupler 200 and penetrates into the natural ground from the discharge hole formed in the outer peripheral surface of the steel pipe 100. In this way, the natural ground is reinforced around the steel pipe 100. After that, the reinforced ground is excavated sequentially according to the tunnel shape. As shown in FIG. 5, since a recess is formed by the support portion 42 between the flange portion 43 of the joint member 4 and the coupler 200, the joint member 4 can be detached from the coupler 200 with a finger in this recess. And the coupler 200 can be pulled out.

  Moreover, when the steel pipe is long, as shown in FIG. 6, a chemical | medical agent can also be inject | poured. FIG. 6 is a schematic view showing a method of injecting a chemical solution when the steel pipe is long. For example, when the steel pipe is long, the chemical solution may not spread over the entire length of the steel pipe. Therefore, as shown in FIG. 6, the steel pipe 100 is divided into three regions along the axial direction, and the three injection tubes reaching the respective regions are inserted into the steel pipe. Here, the first area, the second area, and the third area are set from the area close to the face to the area far from the face. The injection tubes that reach the vicinity of the tip of the first to third regions are referred to as first, second, and third injection tubes 71 to 73, respectively. Static mixers 711 to 731 are connected to the distal ends of the injection tubes 71 to 73, respectively. Further, the three injection pipes 71 to 73 are bundled with a fixture 65 inside the steel pipe 100 so as not to leave.

  The base end of the steel pipe 100 is liquid-tightly closed by a plug 66, and injection pipes 71 to 73 are inserted into the plug 66 in a liquid-tight manner. And the mixing unit 10 which concerns on this embodiment is attached to the base end part of each injection pipe 71-73 which protrudes from the stopper 66 to tunnel space, and A liquid and B liquid are inject | poured.

  According to such a construction method, the steel pipe 100 is divided into three regions, and the mixed chemical solution is supplied from the injection tubes 71 to 73 to each region. The mixed chemical liquid flows out to the natural ground through the discharge hole 101 of the steel pipe 100 and reinforces the natural ground. Therefore, even when the long steel pipe 100 is used, the mixed chemical solution can be supplied over the entire steel pipe.

<5. Features>
As described above, according to the present embodiment, in each of the modules 1 and 2 formed integrally, the third flow path 13 and 23 to the first flow path 11 and 21 are formed in a smooth curved shape. Since the chemical solution is injected through the connection paths 14, 15, 24, and 25, the chemical solution smoothly passes through the modules 1 and 2. And since the 1st flow paths 11 and 21 of each module 1 and 2 are arrange | positioned in parallel, they do not collide with each other but are mixed in the combined flow path 311 (joint member 4). In this way, in the flow path from the modules 1 and 2 to the combined flow path 311, the flow of the chemical solution is not greatly hindered and flows smoothly, so that pressure loss can be prevented from occurring. As a result, the mixed liquid can be discharged from the combined flow path 311 at a high pressure. Moreover, the partition plate for dividing the two flow paths as in the conventional example is unnecessary, and the mixing unit 10 is formed by combining the two modules 1 and 2 formed in a pipe shape in advance. No dimensional accuracy is required, and manufacturing is simplified. In the first place, the two modules 1 and 2 have the same shape formed by processing a stainless steel pipe-like member in a factory-reversed state, so quality control is easy, and material processing costs are also increased. Inexpensive.

<6. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

<6-1>
In the above embodiment, the third flow paths 13 and 23 are provided at the rear ends of the second flow paths 12 and 22 in the modules 1 and 2, but the third flow paths 13 and 23 may not be provided. In other words, at least the first flow paths 11 and 12 communicating with the combined flow path 311 and the second flow paths 12 and 22 connected to the first flow paths 11 and 24 via the first connection paths 14 and 24 may be provided.

<6-2>
In the said embodiment, although the aluminum die-casting part as a connection part is manufactured by aluminum die-casting, it is not limited to this. That is, a material other than aluminum may be used, or it can be formed by ordinary casting.

<6-3>
In the above embodiment, the aluminum die cast part 3 is provided as a connecting part in order to connect both modules 1 and 2, but the present invention is not limited to this. That is, at least the first flow path 11 of the first module 1 and the first flow path 21 of the second module 2 are connected so as to be adjacent to each other. The combined flow path 311 that communicates with the open end of the first flow path 21 of the two modules 2 may be formed. Therefore, it may not be a molded product, and may be a member that fixes both modules and has a combined channel. Further, the member that connects the first flow path 11 of the first module 1 and the first flow path 21 of the second module 2 so as to be adjacent to each other and the member that forms the combined flow path may be formed separately. it can.

<6-4>
Further, the configuration of the joint member is not particularly limited as long as it is configured to be able to be connected to another member into which the mixed solution flows from the combined flow path and to which the mixed solution is to be supplied.

<6-5>
In the said embodiment, although the 1st flow paths of each module are arrange | positioned in parallel, the angle which both the 1st flow paths 11 and 21 make is about 0-37 degree | times, for example.

DESCRIPTION OF SYMBOLS 1 1st module 10 Mixing unit 11 1st flow path 12 2nd flow path 14 1st connection part 2 2nd module 21 1st flow path 22 2nd flow path 24 1st connection part 4 Joint member 3 Aluminum die-casting part ( Connecting part)
311 Joint channel 312 Female thread

Claims (6)

A mixing unit for mixing a liquid chemical for consolidation of two liquids used in a tunnel auxiliary construction method,
A first flow path formed integrally with the second flow path, and a connection path connecting the two flow paths, the connection path being formed in a curved shape and having an obtuse angle; A pipe-shaped first module connecting the second flow paths;
A first flow path formed integrally with the second flow path, and a connection path connecting the two flow paths, the connection path being formed in a curved shape and having an obtuse angle; A pipe-shaped second module connecting the second flow paths;
The first channel of the first module and the first channel of the second module are connected so as to be adjacent to each other, and the opening end of the first channel of the first module and the first of the second module are connected. A connecting portion in which a combined flow channel communicating with the open end of the flow channel is formed;
A mixing unit.   The mixing unit according to claim 1, wherein the connecting portion is formed so as to cover at least a part of an outer peripheral surface of the first module and the second module.   The joint member attached to the said combined flow path formed in the said connection part, and further connecting the 1st flow path of the said 1st module and the 1st flow path of the said 2nd module is further provided. The mixing unit described in 1. An internal thread is formed on the inner wall surface of the joint channel,
The mixing unit according to claim 3, wherein a male screw that is screwed into the female screw is formed on an outer peripheral surface of the joint member. A method for producing a mixing unit for mixing a two-liquid mixing type liquid chemical used in a tunnel auxiliary method,
A first flow path formed integrally with the second flow path, and a connection path connecting the two flow paths, the connection path being formed in a curved shape and having an obtuse angle; Preparing a pipe-shaped first module connecting the second flow paths;
A first flow path formed integrally with the second flow path, and a connection path connecting the two flow paths, the connection path being formed in a curved shape and having an obtuse angle; Preparing a pipe-shaped second module connecting the second flow paths;
The first and second modules having the first flow paths adjacent to each other are connected so as to cover at least a part of the outer peripheral surfaces of the two modules, and the opening ends of the first flow paths of the first modules And forming a connecting portion having a combined flow path communicating with the open end of the first flow path of the second module;
A method for manufacturing a mixing unit.   The method for manufacturing a mixing unit according to claim 5, wherein in the step of forming the connecting portion, the connecting portion is formed by aluminum die casting.

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