JPS6358971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tip device for an injection tube, and more particularly to a tip device having both orthogonal and countercurrent mixing points.

In recent years, this type of chemical injection method has become more sophisticated and complex, and as a result, there has been a definite shift from conventional single-tube rods to double-tube rods, and multi-tube rods are also being developed. However, concentric multiple pipes are unfavorable in terms of flow rate and flow path control, and when feeding materials that tend to deposit, the problem of deposits and solidification within the pipes arises.

On the other hand, when considering the conventional mixing method for two-part curable materials, there is a 1.5 shot mixing method.
In this method, the problem of solidification within the injection tube remains, at least depending on the unit injection amount and gel time settings.

Next, as in JP-A No. 53-117209, a mixing chamber is constructed in the injection pipe, a mixing member is arranged in the chamber, one grout is applied to this, and the grout is scattered there, and the grout is scattered in the same direction. A method has been developed in which the grout is mixed with the other grout that has been pumped, or a similar in-pipe mixing method in which the B solution is mixed with the A solution by joining it from the side. However, in all of these methods, although the flows are angled, the liquids are flowed in the same direction and mixed together, so that the mixing properties are not sufficient. Furthermore, since the merging contact time is extremely short, it is possible that the mixture will be injected into the surrounding ground without being reliably mixed. Furthermore, in the case of in-pipe mixing, there is still a distance from the mixing point to the injection port, so clogging due to solidification of the grout is unavoidable. In addition, the injection devices used in these methods do not take into account backflow prevention, so if there is a problem with one of the injection channels, the chemical solution will flow from the other channel into the one channel. Backflow could occur, which could pose a major problem during construction. In addition, although these methods are sufficiently effective after mixing and injecting two liquids in equal amounts, they lack reliability in ensuring that the two liquids are mixed in equal amounts.

The present invention is based on the above-mentioned prior art and provides a tip device capable of orthogonal mixing and/or countercurrent mixing.

The present invention will be explained below with reference to embodiments shown in the drawings. Reference numeral 1 in the figure is the main outer tube of the injection tube, and a joint outer tube 2, an outer tube 3 of the distal end device, and a distal end shoe 4 are respectively screwed and connected in front of the main outer tube. Inside the main outer pipe 1, main inner pipes 5 and 6 are arranged in parallel, and parallel joints 7 and 8 are connected to the joint outer pipe 2 and outer pipe 3 so as to be connected thereto. Decorated. Also, parallel communication passages 9, 10, 1 are provided inside the outer tube 3.
An inner tube 12 having a diameter of 1 is installed inside. In this way, up to the outer tube 3, the insides of the main inner tubes 5 and 6 become the A flow path and the B flow path, and the gap between the main inner tubes 5 and 6 and the main outer tube 1 becomes the C flow path. Further, the insides of the joints 7 and 8 form an A flow path and a B flow path, and the gap between the joints 7 and 8 and the outer joint tube 2 forms a C flow path. At the position of the outer tube 3, the communication passages 9, 10, 1 of the inner tube 12
The inside of 1 is an A flow path, a B flow path, and a C flow path, respectively. In this way, three independent channels are constructed up to the tip device.

Guide passages 13 and 14 are formed at the outer periphery of the distal end of the inner tube 12 and between it and the outer tube 3. Ball-shaped check valves 15 and 16 are installed at the outlets leading from the communication passages 9 and 10 to the guide passages 13 and 14.
It is housed and arranged in 8. On the other hand, the inner pipe 12
A recessed portion communicating with the communication path 11 is formed at the center of the tip, and the guide 19 is fitted into this recessed portion. The guide 19 has a guide hole 20 along the axis.
and discharge holes 21 and 22 that open in the radial direction are formed, respectively. Further, between the outer periphery of the guide 19 and the concave portion of the inner tube 12, an annular check valve 23, 2 made of rubber or the like and having a tongue portion 23a directed obliquely forward.
3 is interposed in two stages. On the other hand, a guide hole 24 is formed at the tip of the guide 19 so as to intersect with the axis, and communicates with the gap between the outer periphery of the guide 19 and the concave portion of the inner tube 12 . Further, the opening of the guide hole 24 faces the guide path 13.

Furthermore, the outer peripheral surface of the tip of the guide element 19 is spaced apart from the inner peripheral surface of the tip shoe 4, and the tip surface is separated from the stepped surface of the tip shoe 4, and sub-guide paths 13a and 14a communicate with the guide paths 13 and 14, respectively. , as well as the opposing guideway 13
b, 14b are configured. Further, a spout 25 is formed in the tip shoe 4, and the opposing guide paths 13b, 14
b and the external space are communicated with each other.

In the device configured in this way, if liquids A and C, which are two-component curing materials, are now force-fed into the A flow path and the C flow path, respectively, the A liquid will push the check valve 15 aside and flow into the guide path 13. reach. The C liquid is discharged from the guide hole 20 through the discharge holes 21 and 22, and the check valve 2
The tongue portions 23a, 23a of 3 and 23 are bent forward, passing between the outer peripheral surface of the guide element 19 and entering the guide hole 24, and discharged into the guide path 13 from the discharge opening thereof.
The A and C liquids are orthogonally mixed at the intersection of the guide path 13 and the guide hole 24, and the mixed liquid passes through the sub-guide path 13a and the opposing guide path 13b and is ejected from the jet port 25. If liquid B is forced into the B flow path at the same time, the liquid B will displace the check valve 16 and escape into the guide path 14, passing through the sub guide path 14a and the opposing guide path 14b. Therefore, the B liquid is mixed with the mixed liquid in a countercurrent manner at an intermediate position connecting the opposed guide passages 13b and 14b, and then is discharged from the spout 25. Incidentally, in the above example, liquid A and liquid C were simultaneously pumped, but if liquid A or liquid C is pumped alone, liquid B will mix with liquid A or C in a countercurrent manner. Moreover, if each liquid A, B, and C is pumped alone, it goes without saying that they will be ejected from the ejection port 25 through the respective flow paths.

As mentioned above, if this advanced device is used, it is possible to pump each liquid alone, mix two liquids orthogonally and inject them, mix two liquids countercurrently and inject them, and The flow path can be selected as appropriate depending on the construction method, such that the liquid is mixed orthogonally and then mixed countercurrently with another liquid and then injected.

In the above embodiment, as shown in FIG. 5, a countercurrent mixing point is configured ahead of the orthogonal mixing point, but as shown in FIG. It is also within the scope of the invention to provide orthogonal mixing points.

Furthermore, since check valves 15, 16, 23, and 23 were provided at the discharge portion of each flow path in the above example, it is possible to prevent the slime from flowing back into the flow path and the injected liquid from entering other flow paths. It can definitely be prevented.

On the other hand, in this device, the purpose of using orthogonal mixing or countercurrent mixing when mixing liquids is mainly to solve the problems of the conventional mixing method mentioned above, but incidentally, if the gel time When using a chemical solution with an extremely short gel time, the goal is to further shorten the gel time to increase its effectiveness. By the way, if you pour a two-component mixed chemical solution into a beaker and immediately stir it manually, the gel time will increase.
The gel time was 15 seconds, but according to the mixing method using the above device, the gel time was changed to 4 to 5 seconds, and the desired uniform mixed chemical solution could be obtained.

As described above, in the present invention, since the mixing method is orthogonal and countercurrent, it is possible to mix uniformly and reliably, and since there are a plurality of places where both types of mixing are performed, it can suitably be applied to various construction methods. Furthermore, since each flow path up to the tip device is independent, it is possible to prevent the chemical solution from solidifying within the tube.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the device of the present invention, FIG. 2 is a sectional view taken along the - line, FIG. 3 is a sectional view taken along the - line, FIG. 4 is a partially enlarged sectional view of FIG. 1, and FIG. 6 is a schematic explanatory diagram of a flow path of a chemical liquid in the device of the present invention, and FIG. 6 is a schematic explanatory diagram of the same with a different aspect. 3... Outer pipe, 12... Inner pipe, 9, 10, 11...
...Connection path.

Claims (1)

[Claims] 1. An inner tube 12 is provided in the outer tube 3 of the tip device, and parallel communicating passages 9, 10, 11 are independently formed on the base side of the inner tube 12 passing through it in the axial direction, and one of the communicating passages 9 is connected to a guide path 13 passing between the outer tube 3 and the inner tube 12 at the tip end, and is connected to another communication path 10.
A guide path 14 passing between the outer tube 3 and the inner tube 12 at a position opposite to the guide path 13 at the tip end.
Further, another communication path 11 communicates with a guide hole 24 extending in a direction perpendicular to the axis of the inner tube 12 on the side of the tip, and the center of the opening of the tip of the guide hole 24 is perpendicular to the guide path 13. The guide passages 13 and 14 are formed between the distal end surface of the inner tube 12 and the inwardly projecting portion of the outer tube 3, and the guide passages 13 and 14 are formed between the distal end surface of the inner tube 12 and the inwardly projecting portion of the outer tube 3, and are aligned with the axis. A tip device for an injection tube characterized in that the opposing guide paths 13b, 14b are connected to opposing guide paths 13b, 14b formed on orthogonal lines, and these opposing guide paths 13b, 14b are connected to a spout 25 at the tip of the outer tube 3.