JPH072778Y2 - Packer for bedrock consolidation method - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a packer using a polyurethane resin as a foaming agent for a rock solidification method. More specifically, the present invention relates to an encapsulated packer for a rock consolidation method which is easy to use and has an excellent sealing effect.

[Conventional technology]

Generally, in tunnel construction, etc., in order to prevent the risk of collapse of the roof due to tunnel excavation, a hole is formed in the roof, and a rock solidifying agent (hereinafter simply referred to as solidifying agent) is injected into the hole. Then, the roof is solidified.

In injecting the solidifying agent, first insert a hollow pipe for injecting the solidifying agent into the hole, and then insert a packer around the hole to seal the gap between the hollow pipe and the hole wall,
It is necessary to prevent the leakage of the solidifying agent injected later.

An example of the packer in this case is one in which a rubber ring or a rubber tube is attached to the outside of the hollow pipe and is inserted into the perforation to seal the gap between the hollow pipe and the perforation wall,
Further, there is a method in which a polyol component and a polyisocyanate component, which are raw materials of a polyurethane resin as a foaming agent, are mixed and impregnated with a waste or the like to fill the periphery of a hollow pipe, and foam-cured to seal a gap.

[Problems to be solved by the device]

However, the places where rock solidification usually needs to be done are places with many cracks or roughened perforated walls, such as rock crush zones and fault zones, so the rubber ring and rubber tube in the former packer. In the sealing method according to (2), the solidifying agent may leak through the gap still remaining between the hollow pipe and the perforated wall or the crack existing on the perforated wall, and the object may not be sufficiently achieved.

Further, in the latter packer, the polyol component and the polyisocyanate component are used by measuring and mixing immediately before use, and therefore (1) work such as measuring and mixing must be performed on site.

(2) After mixing, the mixed solution may start a curing reaction immediately and may foam and solidify in the mixing container. Therefore, the mixed solution must be used within a certain period of time, and a large amount of mixed solution should be prepared at one time. I can't keep it.

(3) A used mixing container must be washed with a solvent immediately after use.

(4) Since the waste mixture is impregnated with the mixed solution and filled in the perforations, the mixed solution may drip and adhere to clothes or the like, which is not preferable.

(5) It is economically disadvantageous because the expensive mixed liquid is attached to the mixing container and remains, or is wasted from the waste and is wasted.

The workability and the economical efficiency are poor.

[Means for Solving the Problems]

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have put the polyol component and the polyisocyanate component of the polyurethane resin raw material into each chamber of the synthetic resin film tube which is partitioned into two chambers. We found that all these problems could be solved by storing them separately, and completed the present invention.

That is, the present invention is a bedrock consolidation in which the polyol component of the polyurethane resin raw material and the polyisocyanate component are separately stored in each chamber of a synthetic resin film tube which is closed at both ends and divided into two chambers at the center. Regarding the packer for construction method.

The synthetic resin film tube used in the rock solidifying method packer of the present invention is made of a material that can be partitioned into two chambers at the center of the tube by heat sealing, for example, a three-layer laminate of polyethylene-nylon-polyethylene. The one made of film is used.

The method for manufacturing the rock solidifying method packer of the present invention will be described below with reference to FIG.

First, the central portion of a synthetic resin film tube 1 made of a heat-sealable material and having open both ends is welded by heat sealing to form a partition portion 2, so that the tube 1 can be divided into right and left portions. From each end of each of the opened and separated tubes 1, a polyol component and a polyisocyanate component are injected into separate chambers,
Both ends of the tube 1 are sealed by an appropriate method to form a polyol component storage portion 3 and a polyisocyanate component storage portion 4, respectively, to obtain a rocker consolidation method packer 5 of the present invention.

[Action]

In using the rock solidifying construction method packer 5 of the present invention, first, either the polyol component storage portion 3 or the polyisocyanate component storage portion 4 is pressed by hand to push through the partition portion 2 to break both components. Are mixed by contact.

Next, as shown in FIG. 2 showing the usage state, first insert the hollow pipe 8 into the perforation 7 provided in the bedrock 6, and then insert the hollow pipe 8 into the gap between the hollow pipe 8 and the inner wall of the perforation 7. Packer 5 for the above-mentioned bedrock consolidation method in which the components are mixed by contact
Fold it in half and insert it with a dowel stick.

At that time, since a hole is made in the tube 1 by the filling rod, the mixed solution which is contact-mixed in the tube 1 flows into the perforation 7 and foam-hardens to form the foam layer 9, and the hollow pipe 8
And the inner wall of the perforation 7 is sealed at the opening of the perforation 7.

Then, the solidifying agent 10 injected later through the hollow pipe 8 is prevented from leaking to the outside of the perforation 7, and the rock 11 of the bedrock 6 is prevented.
The solidifying agent 10 can be completely permeated to the inside of the.

[Effect of device]

The packer for rock solidification method of the present invention has the following excellent effects.

(1) A reliable sealing effect can be obtained even if the inner wall of the perforation provided in the bedrock is rough or has cracks.

(2) By encapsulating the packer, no special machine or mixing container is required for filling the packer into the perforations, the filling work is simple, and the mixed solution itself is not wasted. Therefore, the cost of the bedrock consolidation method itself can be reduced.

(3) Since the packer is encapsulated and both components are contact-mixed in the tube and quickly discharged into the perforations, a foaming agent having a shorter curing time than that in the conventional mixing container is used. It can be used and the total working time is shortened.

[Examples and Comparative Examples]

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Example Inner diameter 28 mm, length 500 mm made of synthetic resin film tube (trade name ES tube, Towa Kako Co., Ltd., polyethylene-nylon-polyethylene three-layer laminate film tube) central part and heat partition,
Polyurethane resin raw material polyol component and polyisocyanate component in the left and right chambers in the same amount of 25 to 100 g
Then, the both ends were sealed and the rockers a to e for rock solidification method of the present invention were obtained.

The test for confirming the sealing performance was performed as follows.

First, on the roof of the talus tunnel, a self-drilling bolt having a diameter of 42 mm and a length of 3 m was used to drill 5 holes a to e by using a rec auger at intervals of about 1 m.

Then, the packer a of the present invention obtained as described above.
By pressing one of the storage chambers of ~ e by hand to smash the partition, and after mixing both components by contact, fold it in two and insert it into each perforation using the insert rod. Then, a hole was opened in the tube to allow the mixed solution to flow into the hole, and the foam was cured.

After that, through a self-drilling bolt, the same two-component polyurethane resin (4 times foam,
Foaming start time 40 seconds) was injected into each perforation as a solidifying agent, and the injection pressure when the solidifying agent leaked from the mouth of the perforation was measured. The results are shown in Table 1.

Comparative Examples 1 and 2 Tests were carried out under the conditions shown in Table 1 by a method used in a conventional rock solidification method to impregnate a waste with a foaming agent to form a packer. The results are shown in Table 1.

As is clear from the results in Table 1, Examples a to d are tests in which the amount of the foaming agent used was sequentially increased, and as the amount of the foaming agent used was increased, the length of the foam layer was also sequentially increased. The injection pressure as the sealing performance is also increasing.

Further, in Example e, a quick-hardening foaming agent in which the foaming start time and the curing time of the foaming agent were shortened was used, and the solidifying agent was injected immediately after the foaming agent flowed out of the tube. .

And these Examples a-e have succeeded in obtaining the target sealing performance, respectively.

On the other hand, in Comparative Examples 1 and 2, it can be seen that the length of the foam layer with respect to the amount of the foaming agent used is shorter than in the Examples, and the waste caused by impregnating the waste cloth with the foaming agent is large.

Further, the foaming start time and the curing time of the foaming agent are also longer than those in the examples.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a packer for rock solidification method of the present invention, and FIG. 2 is a sectional view showing a usage state of the packer in a hole. 1: Tube 2: Partition 3: Polyol component storage 4: Polyisocyanate component storage 5 : Packer for rock solidification method 6: Rock 7: Perforation 8: Hollow pipe 9: Foam layer 10: Solidifying agent 11: Crack

Claims (1)

[Scope of utility model registration request] 1. A bedrock consolidation method in which a polyol component of a polyurethane resin raw material and a polyisocyanate component are separately stored in each chamber of a synthetic resin film tube which is closed at both ends and divided into two chambers at a central portion. Packer.