JPH07988B2 - Ground consolidation method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ground consolidation method 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. In other words, this construction method starts with the long tube 1.
Insert a drill drive shaft coaxially inside and attach a drill blade to the tip, while pushing a long pipe 1 into the hole while making a hole in the natural ground 2 with this drill blade, 1 is buried (see FIG. 4). Then, the drill blade and the drill drive shaft are taken out from the long tube 1, and this time, a cement milk discharge pipe (not shown) is coaxially inserted into the long tube 1.
Then, the cement milk discharge pipe is discharged from the tip of the cement milk, and the inside of the long pipe 1 is separated from the tip by a predetermined distance.
Fill with cement milk and then harden. 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 above construction method, the cement milk must be discharged and cured while pulling the cement milk discharge pipe toward the front, and therefore the work is complicated. In addition, recently, a method of using a chemical such as an expansion-hardening chemical is also used because it cures rapidly and has high strength. It causes a situation where the pipe cannot be pulled out. Therefore,
It is not possible to use the above-mentioned quick-hardening chemicals, 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 possible to use a quick-hardening congealing liquid that is easy to work, and can also consolidate the ground between long pipes continuously. Its purpose is to provide a solidification method.

[Means for solving problems]

In order to achieve the above-mentioned object, the ground consolidation method of the present invention is to insert and fix a peripheral wall hole-opening long tube in a long hole bored in the ground, and in the long tube, in the longitudinal direction. A bag forming body is provided at a predetermined interval, and a partition forming pipe communicating with the inside of the bag by a hole formed in the peripheral wall is inserted, and two adjacent partition forming pipes are inserted. Inserting a plurality of discharge pipes so as to position the respective tip openings between the bag bodies, press-fitting the expansion-hardening chemical liquid into the partition wall forming pipes, and discharging this into the bag body to cure it Form a plurality of partition walls consisting of the expanded bag in the scale,
In that state, the congealing chemicals are discharged from the tip openings of the plurality of discharge pipes to fill each space partitioned by the plurality of partition walls, and then from the peripheral wall hole of the long pipe to the outer periphery of the long pipe. It is configured such that it is permeated and hardened into the natural ground, and a consolidating region is formed in the natural ground in the long pipe and the outer circumference of the long pipe.

[Action]

That is, in the ground consolidation method of the present invention, a long tube is inserted and fixed in a long hole bored in the ground, and the expansion-hardening chemical liquid is fed into the long tube through a partition forming tube, This is put in a bag body provided at a predetermined interval in a partition wall forming tube to harden the bag body in an expanded state to form a partition wall, and the long tube is divided into a plurality of spaces. The congealing liquid medicine is press-fitted into the inside through a plurality of discharge pipes. Therefore, it becomes possible to discharge the congealing chemicals into each space in the long tube substantially at the same time, as in the conventional example,
It is not necessary to work while pulling out the discharge pipe from the long pipe. As a result, reinforcement work becomes easy and at the same time,
It becomes possible to use a rapid hardening chemical liquid for consolidation, and it is possible to greatly reduce the construction time. Further, since the long tube is divided into each space by dividing the inside by a partition wall, a pressure increase in each space is rapidly caused by the press-in of the consolidating chemical solution, whereby the consolidating chemical solution is contained in the space. After being filled, it is discharged to the outside from the peripheral wall hole provided in the peripheral wall of the long tube, penetrates into the natural 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. Further, since the partition wall is formed by feeding an expansion-hardening chemical liquid into the liquid-permeable bag and expanding and hardening it, the work becomes extremely easy and the long tube is deformed, for example. Even if it does, the partition wall will be 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〕

FIG. 1 shows a metal long tube 5 used in an embodiment of the present invention. FIG. 2 shows a partition wall forming tube 6 disposed inside the tube, and FIG. 3 shows a discharge tube 7 respectively. Shows. 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 portion), with 5m intervals along the longitudinal direction and 4 pouring holes (only 2 can be seen in the figure) at regular intervals along the circumference. 8 is drilled. The partition forming pipe 6 has an outer diameter of 10 mm and an inner diameter of 8
Made of mm metal pipe material, along the longitudinal direction
Holes are provided at intervals of 5 m, and short tubular projections 9 are provided at the edges of the holes. Reference numeral 10 denotes a flexible double bag made of a flexible cloth, which is attached to the projection 9 and the tip of the partition wall forming pipe 6 so as to cover the opening, and the pressure resistance is set to about 10 kg / cm ² . The discharge pipe 7 has an outer diameter of 12 mm and an inner diameter of 10 mm.
Of the metal pipe material, and the tip is formed in the discharge hole. This discharge pipe 7 is a set of 6 (only one is shown), and each length differs by 5 m (the longest length is 28 m, the shortest length is 3 m). Is set.

The solidification of the ground using the long pipe 5 and the like is performed as follows. That is, first, as shown in FIG.
A drill drive shaft 11 is coaxially inserted in the long tube 5, 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 to open the long hole 13 in the ground 2, and the long tube 5 is pushed into the long hole 13 by the amount of the opening, and this is continued. The long pipe 5 is buried in the ground 2. Next, the drill blade 12 and the drill drive shaft 11 are taken out from the long tube 5 in that state, this time, the partition wall forming tube 6 is inserted into the long tube 5, and the double bag 10 thereof is attached to the long tube 5. Positioning is performed between the adjacent pouring holes 8 along the longitudinal direction. Then, the six discharge pipes 7 are inserted into the long pipe 5 and the tip ends thereof are positioned at the positions corresponding to the pouring holes 8 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 6 and the rear ends of the respective discharge pipes 7. First, a pump made of urethane resin is introduced into the partition wall forming pipe 6 from the pump. A hard solidified drug solution is injected at a low pressure of 10 kg / cm ² or less. Next, when the solidifying drug fills each double bag 10, the pressure increases.
At that point, press fitting is stopped. As a result, the solidified drug solution is discharged into each double bag 10 and foams in the double bag 10. As a result, the small bag inside the double bag 10 bursts, and the large bag outside is hardened in a state where the foam is filled and expanded, forming the partition wall portion 14 as shown in FIG. In this case, since the bag expands so as to surround each discharge pipe 7, 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 described above is press-fitted from the root side of the discharge pipes 7 and discharged from the discharge holes at the tips of the discharge pipes 7. As a result, the above-mentioned solidified drug solution is contained in each space surrounded by the partition wall 14 and the peripheral surface of the long tube 5,
They are filled almost at the same time, and then discharged from the tip opening of the long tube 5 and each pouring hole 8 into the long hole 13 by the pressure at the time of filling and the pressure due to the chemical reaction of the chemical liquid. 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 the urethane resin is continuously formed in the ground 2 in the shape of an arch, so that the long pipe 5 and the discharge pipe 7 and the like are reinforced in the ground 2 while remaining in the ground 2. Is done.

In addition, although the cloth double bag 10 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 7, in addition to a metal pipe, a soft pipe such as a nylon tube can be used. Also,
Since the collapse of the long hole 13 is prevented by burying the long pipe 5, a plurality of long holes 13 are previously formed in the planned excavation surface of the natural ground 2 and the long pipe 5 is inserted and fitted. At a later date, it is also possible to perform the work of press-fitting the consolidation chemical.

〔The invention's effect〕

According to the present invention, since the solidification and reinforcement of the natural ground is performed as described above, the reinforcement work can be extremely facilitated, and the quick-hardening chemical liquid for consolidation can be used, and the work time can be shortened. In addition, since the interior of the long tube is divided into narrow spaces and the consolidating chemical liquid is discharged into each of the spaces, the discharged chemical liquid permeates the ground through the pouring hole by the pressure and hardens there. Therefore, not only the inside of the long pipe but also the ground around the long pipe is solidified, and the ground can be reinforced more strongly. Furthermore, since the formation of the partition wall can be performed by the work of simply press-fitting the solidifying chemical liquid consisting of the expansion-hardening chemical liquid into the partition wall forming tube, it is extremely easy and even if the long tube is deformed or the like, Since the bag follows the shape, 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 of a conventional example. 2 ... Ground, 5 ... Long tube, 6 ... Partition forming tube, 7 ...
Discharge pipe, 8 …… pouring hole, 10 …… double bag, 13 …… long hole, 14
...... Partition wall part, 15 ...... hardening part, 16 ...... solidification area

Claims (1)

[Claims] 1. A long tube having a peripheral wall hole opened therein is inserted and fixed in a long hole formed in the natural ground, and a bag body is provided in the long tube at predetermined intervals in the longitudinal direction, and a perforated wall is formed. A partition wall forming tube that communicates the inside of the bag body with the inside of the bag body is inserted by the provided hole portion, and a tip opening is positioned between two adjacent bag bodies of the partition wall forming tube. And then insert a plurality of discharge pipes, press-fit an expansion-hardening chemical into the partition wall forming pipe, discharge it into the bag body, and cure it to form a plurality of partition walls of the bag body expanded in the long tube. Is formed, and in that state, the consolidating drug solution is discharged from the tip openings of the plurality of discharge pipes to fill each space partitioned by the plurality of partition walls, and then from the peripheral wall hole of the long pipe. It is permeated and hardened in the ground around the long pipe, and the ground inside and outside the long pipe Natural ground consolidation method, which comprises forming a consolidated region.