JPH0439359Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a static mixer that is inserted and fixed in the axial direction within a lock bolt and agitates the liquid passing through the lock bolt.

[Conventional technology]

In tunnel construction, etc., in order to prevent cave-ins, hollow pipe-shaped rock bolts are inserted into holes formed in the bedrock (ground), and rock solidification liquid made of two-component foamed urethane resin is poured into them. The method is to press-fit the material into the hole and solidify it into the surrounding ground. In order to mix and stir the two urethane resin liquids, a static mixer as shown in FIG. 8 is installed in the lock bolt along the axial direction. As shown in the figure, this static mixer includes approximately spiral elements 31a, 31b, 31c.
are arranged in series at different angles around the axis, and the two liquids a and b introduced into this static mixer are made to advance separately along the respective undulating surfaces on both sides of the element, and at the boundary of each element. They collide and interfere with each other and are mixed and stirred to make a uniform mixture.

[Problem that the invention attempts to solve]

However, in such a static mixer, the liquid flowing along the respective undulating surfaces of each element partially intersects and collides at the boundaries between the elements, so the momentum of the flow is lost and the flow velocity becomes slow. For this reason, when a rock consolidation liquid with a short curing time is used, there may be a problem that the chemical liquid hardens within the rock bolt.

This idea was devised in view of these circumstances, and it is a static mixer that can sufficiently mix the rock solidification liquid, which takes an extremely short curing time after mixing the two liquids, without curing it inside the rock bolt, and then send it out from the rock bolt. Its purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the stationary mixer of this invention is a stationary mixer that is fitted and fixed in the lock bolt along the axial direction, and has a ring-shaped mounting seat and a center of the ring of the ring-shaped mounting seat. Comprising a semicircular single blade provided on one side of the central axis extending perpendicularly to the ring-shaped mounting seat, and a semicircular double blade provided on the other side of the central axis. , a plurality of the semicircular single blades are provided at appropriate intervals along the central axis direction with an upward slope rising from one end of the semicircular shape to the other end; The blades are two semicircular blades with one end joined and the other end separated, and with the separated side located between the single blades, the blades are tilted in the opposite direction to the single blade and in the direction of the central axis. The configuration is such that a plurality of them are provided along the line at appropriate intervals.

In other words, this static mixer does not mix and stir the two liquids by crossing them and colliding with each other at the boundary of the elements, as in the conventional example, but by using blades arranged on both sides of the central axis of the static mixer. By changing the arrangement, the two liquids are rotated and flowed in the same direction, and both liquids flow at the initial flow velocity on one side of the central axis and at an accelerated flow rate on the other side. The accelerated liquid overtakes the liquid, and in this process the two liquids are mixed. Therefore, energy loss due to cross-collision of both liquids as in the conventional example does not occur, and sufficient mixing can be achieved without reducing the initial flow velocity of both liquids. Therefore, it is possible to use a rock consolidation liquid that takes an extremely short curing time.

Next, this invention will be described in detail based on an embodiment.

〔Example〕

1 to 5 show an embodiment of this invention. In these figures, Fig. 1a shows a perspective view, Fig. 1b shows Fig. 1a viewed from direction A, Fig. 2 shows Fig. 1 viewed from direction B, and Fig. 3 shows a state in which FIG. 2 is viewed from the direction, FIG. 4 shows a state in which FIG. 2 is seen from the direction, and FIG. 5 shows a state in which FIG. 2 is seen from the direction. In these figures, reference numeral 1 denotes a stationary mixer of this invention, which is integrally formed of plastic as a whole, and includes a linear central shaft body 2, a plurality of single blades 3, a plurality of double blades 4, It is composed of a ring-shaped mounting seat 5.

The plurality of single blades 3 are formed of a semi-disc shaped body (see FIG. 2), and as shown in FIG. 2 and 5, they are arranged at predetermined intervals along the axial direction of the central shaft body 2 in an inclined state so as to have an upward and downward slope as shown in the figures. The center of the semicircular right side 6a (see FIGS. 1 and 2) of the semicircular plate-like body is connected and integrally attached to the central shaft body 2. As shown in FIG. 5, the plurality of double blades 4 are provided at positions corresponding to the single blades 3 across the central shaft body 2, with a predetermined interval maintained and inclined in the opposite direction to the single blades 3. ing. The double blade 4 is composed of a blade 7 having the same shape as the single blade 3, and a blade 8 having approximately the same shape as the blade 7 but having a slightly shorter length.
a, 8a are spaced apart, and the other ends 7b, 8b are connected. Then, connect the separated side to the single blade 3
and 3. In this case, the double blade 4 connects the blade ends 7a, 8a on the separated side to the blade ends 8a, 7a on the separate side of the adjacent double blade 4, respectively, and connects the blade ends 7b, 8b on the connection side. The connection part 9 is connected to the end 3a of the single blade 3, and the semicircular right side 6b (see Fig. 2) is connected and integrated with the central shaft body 2, as in the case of the single blade 3. Fixed. In addition, the double blade 4 and the single blade 3 are provided on both sides of the central shaft body 2 and are connected to the central shaft body 2, respectively, and as described above, the double blade 4
The static mixer 1 is interconnected by a connecting portion 9, and further, the portions facing each other with the central shaft body 2 interposed therebetween are interconnected, thereby forming the entire stationary mixer 1 into a strong structure.

The ring-shaped mounting seat 5 has a ring shape with a hole 11 formed in the center, and the mounting portions 12 of the single blade 3 and double blade 4 on the mounting seat 5 side are provided at opposing portions of the ring shape. , 13 are connected. In this case, the central shaft body 2 is set to be perpendicular to the ring-shaped mounting seat 5. Further, the root portion of the central shaft body 2 is cut in the middle and is separated from the ring-shaped mounting seat 5.

The static mixer 1 configured in this way has a sixth
As shown in the figure, the outer periphery of the blade is fitted into the introduction hole 15 provided in the lock bolt 14 in the shape of a hollow pipe with a closed end, with a slight gap formed between the inner wall of the lock bolt 14 and the groove 16 of the introduction hole 15. Position the ring-shaped mounting seat 5 of the stationary mixer 1 at
It is fixed by pressing with the threaded portion 17a of the nipple 17. This lock bolt 14 is fitted with a joint 18 with a check valve 18a on its base side.
An introduction hole 15 is bored from the root side to the tip 19, and a discharge hole 20 is formed on the outer periphery of the tip 19.
is provided.

When using this lock bolt 14, the seventh
As shown in the figure, the lock bolt 14 is inserted into the hole 22 formed in the ground 21, and the connection unit 24c is connected with one touch to the joint 18 with the check valve 18a at the root end of the lock bolt 14. A two-component foamed urethane resin is press-fitted through the hoses 24a and 24b. As a result, the urethane resin is transferred to the introduction hole 15 in the lock bolt 14.
will be introduced in The urethane resin liquids A and B2 introduced into the lock bolt 14 flow through the introduction hole 15 and are mixed and stirred by the static mixer 1, and then are discharged from the discharge hole 20 provided on the tip side of the lock bolt 14, and are discharged from the hole 22. After filling the conditions, it penetrates into the ground and hardens, solidifying the ground. After consolidation is completed, the connection unit 24c is removed with one touch, leaving the lock bolt 14 in the ground for reinforcement.

Here, A of the above urethane resin for rock consolidation,
The manner in which both liquids B are mixed and stirred by the static mixer 1 within the lock bolt 14 is shown in Figures 1 to 5.
This will be explained in detail using figures. In these figures, black arrows indicate the flow of liquid A of the urethane resin liquids A and B, which are press-fitted from the root side of the lock bolt 14, and white arrows indicate the flow of liquid B. Both of the above liquids are
The mixture flows in a laminar state up to the stationary mixer 1 and is mixed there. That is, both liquids A and B have arrived at the static mixer 1 in a laminar flow state,
As shown in Fig. 1a and Fig. 2, the A liquid is introduced into the single blade 3 side, and the B liquid is introduced into the double blade 4 side. (counterclockwise with respect to X) flows while rotating. To explain in more detail, as shown in FIG.
When liquid A is introduced into the static mixer 1 through the hole 11, it flows obliquely upward from one end 3a to the other end 3b along the blade surface of the upwardly inclined single blade 3 as shown in the figure. When it reaches the vicinity of the other end 3b, the inner wall of the lock bolt 14 acts to flow into the separated side (open side) of the double blade 4 located on the opposite side with the central shaft body 2 in between, while turning to the left. From that state, liquid A flows from the separated side of the double blade 4 to the connection part 9.
It flows to the side, and in this process, the speed increases (the flow speed becomes faster because the flow path gradually narrows), and a part of it branches and flows toward the central shaft body 2 as shown by the arrows A ₁ , A ₂ , and A ₃ in the figure.
Similarly, the remaining part turns to the left as shown by arrow A' and flows to the left between the single blades 3 located on the side of the traveling direction X. These arrows A′, A ₁ ~
The flow indicated by A ₃ has been sped up and is now faster than the initially introduced flow rate. On the other hand, B indicated by a white arrow
The liquid descends along the outside of the blades 7 of the double blade 4 in the direction of the arrow, and when it reaches the bottom part of it branches due to the action of the inner wall of the lock bolt 14, as shown by arrow _B1 in the figure. Then, the remaining part turns to the left and flows between the single blades located on the opposite side with the central shaft body 2 in between, and similarly, the remaining part turns to the left as shown by arrow B' and flows between the single blades 3 on the side of the traveling direction X. Flow into. The flows indicated by these arrows B' and _B1 are not accelerated because the intervals between the single blades 3 are the same in all parts, and flow at approximately the same speed as the initial introduction speed. In this case, black arrow A ₁ and white arrow B ₁ flow in the same channel, black arrow A ₂ and white arrow B' flow in the same channel, and the speeds of A ₁ and A ₂ are B ₁ , Since it is faster than B', an overtaking phenomenon occurs between A ₁ and A ₂ , and the two liquids are mixed due to the difference in flow velocity. In this way,
Both liquids A and B are mixed due to the difference in flow rate, and are mixed and transferred in the traveling direction X without substantially reducing the transfer speed.

Thus, the static mixer of this example is
Since both liquids A and B can be mixed and transferred without substantially reducing the transfer speed, the urethane resin, which hardens quickly after mixing the two liquids, can be transferred smoothly without being cured midway.

In the above embodiment, the ends 7a, 8a of the double blade 4 on the separated side are connected to the ends 8a, 7a of the adjacent double blade 4 on the side apart, but it is not necessary to connect them. It is sufficient if the separated side is positioned between the single blades 3 so that the liquid is accelerated.

[Effect of idea]

Since the static mixer of this invention is constructed as described above, the rock consolidation liquid consisting of two liquids is
It is possible to transport the two components while thoroughly mixing them without causing a substantial decrease in transport speed. Therefore, even if the two components are mixed and the chemical solution hardens extremely quickly, it is possible to transport the two components while mixing them without causing them to harden midway.

[Brief explanation of the drawing]

FIG. 1a is a perspective view showing an embodiment of this invention;
Fig. 1b is a perspective view of Fig. 1a in direction A, Fig. 2 is a front view of Fig. 1a seen from direction B, and Fig. 3 is a perspective view of Fig.
Figure 4 is a side view as seen from the same direction, Figure 5 is a side view seen from the same direction, Figure 6 shows the static mixer of this invention installed in the lock bolt. FIG. 7 is an explanatory diagram showing how to use the lock bolt, and FIG. 8 is an explanatory diagram showing a conventional example. 1... Stationary mixer, 2... Central shaft body, 3...
Single blade, 3a, 3b...end, 4...double blade, 5...ring-shaped mounting seat, 7, 8...blade, 7
a, 7b, 8a, 8b... end, 9... connection part,
14...Rock Bolt.

Claims (1)

[Scope of utility model registration request] It is a stationary mixer that is fitted and fixed in the lock bolt along the axial direction, and is sandwiched between a ring-shaped mounting seat and a central axis that passes through the center of the ring of this ring-shaped mounting seat and extends perpendicularly to the ring-shaped mounting seat. and a semicircular single blade provided on one side of the central axis, and a semicircular double blade provided on the other side of the central axis, and the semicircular single blade is attached to one end of the semicircular shape. A plurality of semicircular double blades are provided at appropriate intervals along the central axis direction with an upward slope rising from one end to the other end, and the semicircular double blade joins one semicircular end of the two blades. a stationary mixer, the other end of which is spaced apart, and a plurality of static mixers are provided at appropriate intervals along the central axis direction, tilting in the opposite direction to the single blades with the separated side being located between the single blades;