JPH07989B2 - Ground consolidation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rock mass consolidation device for improving soft ground to a solid ground by a congealing chemical in tunnel drilling work and the like. Is.

[Conventional technology]

2. Description of the Related Art Conventionally, in tunnel drilling work carried out in a stratum zone such as a soft or crushed rock mass, at the first stage of drilling, a pipe roof method has been used to strengthen the rock mass. There is. In this pipe roof construction method, as shown in FIGS. 8 and 9, the planned excavation surface of the ground 2 indicated by chain lines A and B (in FIG. 8, the chain line C indicates the hole of the tunnel, and the chain line A indicates The portion surrounded by and C is formed in the concrete layer), and the long pipe 1 is buried toward the back of the natural ground 2 along the outer periphery of the concrete layer to form a roof that fits in a tunnel shape. This prevents loosening of the natural ground 2 and deformation of the ground surface, and enables safe excavation work. That is, this construction method is performed by using an apparatus provided with a long pipe 1 and a cement milk discharge pipe (not shown). First, a drill drive shaft is coaxially inserted into the long pipe 1 to A drill blade is attached to the tip, and the long pipe 1 is pushed into the ground while making a hole in the ground 2 with this drill blade, and the long pipe 1 is embedded in the ground 2 (see FIG. 4). Then, the drill blade and the drill drive shaft are taken out from the long pipe 1, and this time, the cement milk discharge pipe is coaxially put in the long pipe 1. Then, the cement milk is discharged from the tip of the cement milk discharge tube, the inside of the long tube 1 is filled with the cement milk for a predetermined distance from the tip, and then the cement milk is cured. Next, the cement milk discharge pipe is pulled and retracted a little, and the portion slightly before the portion where the cement milk hardened material is clogged is similarly filled with the cement milk hardened material. In this way, the cement milk is sequentially discharged and hardened, the inside of the long pipe 1 is filled with hardened cement to form the long pipe 1 into a kind of cement pillar, and by arranging it in the multiple natural grounds 2, This is a method to strengthen the ground 2.

[Problems to be solved by the invention]

However, in the construction method using the above apparatus, the work is complicated because the cement milk must be discharged and cured while pulling the cement milk discharge pipe toward you. In addition, recently, a method using a chemical liquid such as an expansion curable chemical liquid has been carried out because of its fast curing and high strength,
If such a chemical solution is used in the above-mentioned construction method, the curing will be quick, and the discharge pipe will not come off during the process.
Therefore, it is not possible to use the above-mentioned quick-hardening chemical liquid, and high-strength reinforcement is impossible. Moreover, it is impossible to reinforce the ground between the long pipes, which is also a big problem when the ground is sandy.

The present invention has been made in view of the above circumstances, and it is easy to work and can use a fast-hardening congealing liquid, and can also consolidate the ground around the long tube. The purpose is to provide a mountain consolidation device.

[Means for solving problems]

In order to achieve the above-mentioned object, the ground consolidating device of the present invention is provided with a large-diameter long pipe having peripheral wall holes formed at predetermined intervals and a plurality of bags at predetermined intervals along the longitudinal direction. And a small-diameter partition wall forming pipe in which the bag body and the interior communicate with each other by a hole formed in the peripheral wall, and a tip is provided in each part between the bag body and the bag body of the partition wall forming tube. A plurality of small-diameter discharge pipes having different lengths so as to be located respectively are provided.

[Action]

That is, the earth consolidating device of the present invention includes a large-diameter long pipe provided with a peripheral wall hole, and a small-diameter partition wall forming pipe having a bag attached to each of a plurality of holes provided at predetermined intervals. ,
A plurality of small-diameter discharge pipes having different lengths are provided so that the tip can be positioned between the bags.
Therefore, when reinforcing the ground, first of all, a long tube is embedded in a long hole drilled in the ground, and a partition wall forming tube with a bag is inserted into this long tube, and each tip is A plurality of discharge pipes are inserted so that is located between the bags. Then, the expansion-curable chemical liquid is fed into the bag body through the partition wall forming tube, and the resin solution is cured in the expanded state of the bag body to form the partition wall to divide the long tube into a plurality of space portions. Next, in this state, the congealing chemicals are press-fitted into each space through a plurality of discharge pipes. As a result, it becomes possible to discharge the congealing chemical liquid to each space in the long tube substantially at the same time. As a result, unlike the conventional example, there is no need to perform work while pulling out the discharge pipe from the long pipe, facilitating reinforcement work and the like, and at the same time, it becomes possible to use a quick-hardening congealing liquid. The construction time can be greatly shortened. Further, since the inside of the long tube is divided by the partition wall into the respective spaces, the pressure increase in each space is rapidly caused by the press-fitting of the consolidating chemical solution, whereby the consolidating chemical solution becomes the space part. After that, it is discharged from the peripheral hole, penetrates into the ground, and hardens there. Therefore, not only in the long pipe, but also in the ground around the long pipe, a consolidating region is formed to reinforce the ground portion between the long pipe and the long pipe, A stronger solidification of the ground will be performed than the conventional pipe roof construction method using cement milk. In addition, since the partition is formed by sending an expansion-curable drug solution into the bag body through the partition-forming tube and expanding and curing the same, the work becomes extremely easy and the long tube can be deformed, for example. Even if there occurs, the partition wall is formed following the shape, and the partition wall can be formed according to the inner peripheral surface of the long tube.

Next, the present invention will be described in detail based on examples.

〔Example〕

1 to 3 show an embodiment of the present invention. That is, FIG. 1 shows a long tube 5 made of metal. The long tube 5 has an outer diameter of 115 mm, an inner diameter of 100 mm, and an overall length of about 30 m (the figure shows only a part). Is set to
Four pouring holes 6 (only two can be seen in the figure) are bored at intervals of 5 m along the longitudinal direction and at regular intervals along the circumference. FIG. 2 shows a partition wall forming pipe 7 arranged in the long pipe 5. The partition wall forming tube 7 is made of a metal pipe material having an outer diameter of 10 mm and an inner diameter of 8 mm, and has holes formed at intervals of 5 m along the longitudinal direction, and a short tubular shape at the edge of the hole. The protrusion 8 is provided. 9 is the protrusion 8
And a flexible cloth double bag attached to the tip of the partition wall forming pipe 7 so as to cover the opening and withstand pressure of 10
It is set to about kg / cm ² . Further, FIG. 3 shows the discharge pipe 10.
The discharge pipe 10 has an outer diameter of 12 mm and an inner diameter of 10 m.
It is composed of m metal pipe material, and the tip is formed in the discharge hole. The discharge pipes 10 are made up of 6 pipes (only 1 pipe is shown), and the lengths of the pipes differ by 5 m (the longest length is 28 m, the shortest length is 3 m). Is set to.

In this structure, the solidification of the ground is performed as follows. That is, first, as shown in FIG.
A drill drive shaft 11 is coaxially inserted in the inside of the machine, a drill blade 12 is attached to the tip thereof, and a drive device (not shown) is attached to the rear end thereof. Then, by operating the above driving device, the drill blade 12 is rotated and the long hole 13 is formed in the natural ground 2.
While opening, the long tube 5 is pushed into the long hole 13 by the amount of the opening, and the long tube 5 is continuously embedded in the natural ground 2. Next, the drill blade 12 and the drill drive shaft 11 are taken out from the long pipe 5 in that state, this time, the partition forming pipe 7 is inserted into the long pipe 5, and the double bag 9 is lengthened respectively. Positioning is performed between two pouring holes 6 that are adjacent to each other along the longitudinal direction of the scale tube 5. Next, the six discharge pipes 10 are inserted into the long pipe 5 and their respective tip portions are positioned at positions corresponding to the pouring holes 6 of the long pipe 5 to obtain the state shown in FIG.
Then, a hose (not shown) of a urethane resin press-fitting pump is connected to the partition wall forming pipe 7 and the rear ends of the respective discharge pipes 10. First, a pump made of urethane resin is introduced into the partition wall forming pipe 7 from the pump. A hard solidified drug solution is injected at a low pressure of 10 kg / cm ² or less. Then, when the solidifying drug fills each double bag 9, the pressure is reduced. At that point, press fitting is stopped. As a result, the solidified drug solution is discharged into each double bag 9 and foams in the double bag 9. As a result, a small bag inside the double bag 9 is ruptured, and the large bag outside is hardened in a state where the foam is filled and expanded to form the partition wall portion 14 as shown in FIG. . In this case, since the bag expands so as to surround each discharge pipe 10, the space between the partition wall portion 14 and the inner peripheral surface of the long pipe 5 and between the partition wall portion 14 and the discharge pipe 10 are increased. It becomes completely blocked. In that state,
The same solidified drug solution as the above is press-fitted from the root side of the discharge pipes 10 and discharged from the discharge holes at the tips of the discharge pipes 10.
As a result, the solidified chemical liquid fills each space surrounded by the partition wall 14 and the peripheral surface of the long tube 5 substantially at the same time, and then the pressure during the filling and the chemical reaction of the chemical liquid cause the solidified chemical liquid to become long. The liquid is discharged from the tip opening of the pipe 5 and each of the pouring holes 6 into the long hole 13. Further, by the above-mentioned pressure, it penetrates into the natural ground 2 and hardens there, and as shown in FIG. 7, a urethane resin hardened portion 15 is formed inside the long tube 5, and at the same time, in the natural ground 2. A portion around the long tube 5 is formed in the consolidation region 16. In this way, the solidified region 16 of urethane resin is continuously formed in the ground 2 in an arched shape, so that the long pipe 5 and the discharge pipe 10 and the like are reinforced in the ground 2 while remaining in the ground 2. Is done.

In addition, although the cloth double bag 9 is used for forming the partition wall in the above-described embodiment, an expansive bag body made of rubber, synthetic resin or the like may be used, and the bag body may be a single bag body. Further, in the above-mentioned examples, as the solidifying chemical for forming the solidifying region, the quick-hardening one made of urethane resin is used, but it is not limited to this and cement milk or water as in the conventional example is used. Glass or the like can also be used. Further, in consideration of the arrival time of the solidification chemical liquid fed into each space, it is possible to press-fit the solidification liquid chemicals having different curing times into the respective portions. As a result, it becomes possible to feed the congealing chemical solution suitable for the position and geology into each space, and it is possible to further strengthen the ground.
Further, as the discharge pipe 10, in addition to a metal pipe, a soft pipe such as a nylon tube can be used. Also,
Since the collapse of the long holes 13 is prevented by burying the long pipes 5, a plurality of long holes 13 are bored in the planned excavation surface of the natural ground 2 and the long pipes 5 are inserted in advance. At a later date, it is also possible to perform the work of press-fitting the congealing chemical.

〔The invention's effect〕

As described above, since the ground consolidating device of the present invention is configured, it is possible to remarkably easily reinforce the ground, and to use the rapid hardening liquid chemical for consolidation. Therefore, the work time can be shortened. Also,
Since the inside of the long tube is divided into small parts, and the condensing liquid chemical can be discharged to each of the spaces, the discharged liquid chemical permeates the ground through the pouring hole at that pressure and hardens there. Not only in the long pipe, but also the ground around the long pipe is solidified, and it becomes possible to strengthen the ground more strongly. Furthermore, since the formation of the partition wall is performed by feeding an expansion-hardening chemical liquid into the bag body and expanding and hardening it, it is extremely easy, and even if the long tube is deformed, the shape of the bag becomes Since the body follows, good partition walls can be formed.

[Brief description of drawings]

FIG. 1 is a partial front view of a long pipe used in the present invention, FIG. 2 is a partial front view showing a state in which a double bag is attached to a partition wall forming pipe disposed inside the long pipe, and FIG. 3 is a discharge pipe. Partial front views, FIG. 4, FIG. 5, FIG. 6 and FIG. 7 are longitudinal sectional views showing a construction state, and FIG. 8 and FIG. 9 are explanatory views showing a conventional example. 5 ... Long tube, 7 ... Partition forming tube, 6 ... Pouring hole, 9 ...
… Double bag, 10 …… Discharge pipe

Claims (1)

[Claims] 1. A large-diameter long tube having peripheral wall holes formed at predetermined intervals, and a hole portion having a plurality of bag bodies provided at predetermined intervals along the longitudinal direction and formed on the peripheral wall. The small-diameter partition wall forming pipe that communicates with each bag body and the inside, and the tips are set to different lengths so as to be located in the respective portions between the bag body and the bag body of the partition wall forming pipe. Ground consolidation device with multiple small diameter discharge pipes.