JPH0781484B2 - 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. This pipe roof construction method, as shown in FIGS. 8 and 9, is a planned excavation surface of the natural ground 2 indicated by chain lines A and B (in FIG. 8, a chain line C indicates a hole portion of a tunnel, and a chain line The portion surrounded by A and C is formed in the concrete layer) along the outer periphery of the long pipe 1 is buried toward the back of the natural ground 2 to form a roof that fits in a tunnel shape. This prevents loosening of the natural ground 2 and deformation of the ground surface due to excavation and enables safe excavation work. That is, in this method, first, a drill driving shaft is coaxially inserted into the long pipe 1 and a drill blade is attached to the tip thereof, and a long hole is formed in the hole while making a hole in the ground 2 with the drill blade. The long pipe 1 is embedded in the ground 2 by pushing in the pipe 1 (see FIG. 3). 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 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, and the inside of the long tube 1 is filled with the hardened cement so that the long tube 1
Is a type of cement-made electric pole, and a plurality of such pillars are arranged in the ground 2, whereby the ground 2 is strengthened.

[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 using a chemical such as a urethane resin has been carried out because of its fast curing and high strength. However, when such a chemical is used in the above method, the discharge pipe may be halfway because of the rapid curing. It causes such a situation that it cannot be pulled out. Therefore, it is not possible to use the above-mentioned quick-hardening chemical liquid, and high-strength reinforcement is impossible. In addition, it is impossible to reinforce the ground between 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 an object thereof is to provide a natural consolidation method, which is easy to work with and can use a rapid hardening chemical for consolidation.

[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 pipe into a long hole bored in the natural ground, and to lengthen the inside of the long pipe in the longitudinal direction. The plurality of discharge pipes are divided into a plurality of spaces by partition walls provided at predetermined intervals, and the plurality of discharge pipes are arranged in the long pipe to open the tips of the plurality of discharge pipes into the plurality of spaces, respectively. After discharging the congealing chemical from the tip opening to fill each of the spaces, it is further permeated and hardened from the peripheral wall hole of the long tube into the ground of the outer circumference of the long tube, and in the long tube and the long tube. The first gist is to form a solidified region in the outer ground, and the inside is divided into a plurality of spaces by partition walls provided in the elongated hole at a predetermined interval in the longitudinal direction, and each tip has the plurality of spaces. The above-mentioned spaces are formed by a plurality of discharge pipes that are open to the whole and extend in the longitudinal direction. Insert and fix the long tube that opens the peripheral wall hole that is in communication with the section, discharge the congealing chemicals from the tip openings of the plurality of discharge tubes, and set the consolidating region in the ground on the outer periphery of the long tube. Forming is the second gist.

[Action]

That is, in the ground consolidation method of the present invention, the interior of the long pipe embedded in the ground is divided into a plurality of spaces by partition walls, and a plurality of discharges are formed by positioning the tip opening in each space. The tube is placed in the long tube. Therefore, by press-fitting the consolidation chemicals into the discharge tubes from the root side of the plurality of discharge tubes, it becomes possible to discharge the consolidation chemicals into the spaces in the long tube at substantially the same time. As described above, it is not necessary to work while pulling out the discharge pipe from the long pipe. As a result, reinforcement work and the like become easy, and at the same time, it becomes possible to use a quick-hardening congealing chemical, and the construction time can be greatly shortened.
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 on the peripheral wall between the long lengths, 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.

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

〔Example〕

FIG. 1 shows a long pipe 5 used in an embodiment of the present invention, and FIG. 2 shows a combined structure of a partition plate 6 and a discharge pipe 7 which are inserted therein. The long tube 5 is
The outside diameter is 155 mm, the inside diameter is 100 mm, and the total length is set to about 30 m (only a part is shown in the figure). The length is set at 5 m intervals along the longitudinal direction, and 4 notes at regular intervals along the circumference. The exit hole 8 is provided. The partition wall plate 6 is composed of six disk bodies (only three are shown) which can be loosely fitted in the long tube 5, and each has a thickness of 300 mm.
The discharge pipes 7 are composed of 6 pipe materials (only 3 pipes are shown) having different lengths of 5 m (the longest length is 28 m and the shortest length is 3 m). The outer diameter is set to 12 mm and the inner diameter is set to 10 mm, and the tip is formed in the discharge hole. The partition plate 6 is provided with insertion holes 9 through which the discharge pipes 7 can be inserted (one partition wall plate 6 at the front end and six partition wall plates 6 at the rear end). By inserting the discharge pipes 7 into the insertion holes 9, the six partition plates 6 and the six discharge pipes 7 are integrated. Further, in a state where the above-mentioned assembly structure is inserted into the long pipe 5, each space portion surrounded by the two partition walls 6 adjacent to each other and the peripheral surface of the long pipe 5 has a pouring hole 8 It is designed to communicate with the outside through.

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 10 is coaxially inserted into the long tube 5, a drill blade 11 is attached to the tip thereof, and a drive device (not shown) is attached to the rear end thereof. Then, by operating the driving device, the drill blade 11 is rotated to open the long hole 12 in the ground 2, and the long tube 5 is pushed into the long hole 12 by the amount of the opening. Then, the long pipe 5 is buried in the natural ground 2. Next, the drill blade 11 and the drill drive shaft 10 are taken out from the long tube 5, and this time, as shown in FIG. 4, the combination body of the partition plate 6 and the discharge tube 7 is inserted into the long tube 5. To do. At the time of this insertion, lubricating oil is applied to the inner peripheral surface of the long tube 5 or the outer peripheral surface of the partition plate 6. Next, a hose (not shown) of a urethane resin press-fitting pump is connected to the rear end of each discharge pipe 7, and a quick-hardening solidified liquid of urethane resin is injected from each pump into each discharge pipe 7. It is press-fitted and discharged from the discharge hole at the tip of each discharge pipe 7. As a result, the above-mentioned solidified drug solution fills each space surrounded by the partition plate 6 and the peripheral surface of the long tube 5 substantially at the same time, and then the pressure at the time of filling and the chemical reaction of the drug solution cause a long-term The liquid is discharged from the tip opening of the pipe 5 and each of the pouring holes 8 into the long hole 12. Further, by the above-mentioned pressure, it penetrates into the natural ground 2 and hardens therein, and as shown in FIG. A portion around the long tube 5 is formed in the consolidation region 14. In this way, the solidified region 14 of the urethane resin is continuously formed in the ground 2 in an arch shape, so that the long pipe 5 and the discharge pipe 7 can be reinforced while leaving the ground pipe 2 in the ground 2. Done.

FIG. 6 shows a long tube used in another embodiment. That is, the assembly structure shown in FIG. 2 is inserted into the long tube 5 in advance. Therefore, as shown in FIG. 7, a drill drive shaft having a drill blade 11 attached to the tip thereof.
By rotating 10 to form a long hole 12 in the ground 2,
Next, the state shown in FIG. 4 can be obtained only by inserting the long tube 5 into the long hole 12. The subsequent steps are the same as those in the above-mentioned embodiment.

According to this embodiment, since the assembly structure can be inserted into the long pipe 5 at the factory, not at the reinforcement site, the work environment is excellent, and the necessary amount is prepared in advance. The construction time can be shortened because the construction can be carried by bringing it to the reinforcement site.

Incidentally, in each of the above-mentioned examples, a rapid hardening agent made of a urethane resin is used as the binding chemical, but it is not limited to this and cement milk or water glass as in the conventional example is used. You can also Further, in consideration of the arrival time of the solidifying chemical liquid fed into each space, the solidifying chemical liquids having different curing times can be press-fitted into each space. As a result, it becomes possible to feed the congealing chemical solution that matches the position and geology into each space portion, and it is possible to further strengthen the ground level.

〔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 a quick-hardening liquid chemical 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 space, the discharged chemical liquid permeates into 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, so that the ground can be reinforced more strongly.

[Brief description of drawings]

FIG. 1 is a partial front view of a long pipe used in one embodiment of the present invention, and FIG. 2 is a partial front view of a combination of a partition plate and a discharge pipe arranged therein, FIGS. 5 and 5 are longitudinal sectional views showing a construction state, and FIG. 6 is a longitudinal sectional view of a long pipe provided with a partition plate and a discharge pipe used in another embodiment,
FIG. 7 is a longitudinal sectional view showing a state in which a long hole is bored in the natural ground, and FIGS. 8 and 9 are explanatory views showing a conventional example. 2 ... Ground, 5 ... Long tube, 6 ... Partition plate, 7 ... Discharge pipe, 8 ...
Pouring hole, 12 ... long hole, 13 ... cured part, 14 ... consolidation area

Claims (2)

[Claims] 1. A long pipe having a peripheral wall hole opened therein is inserted and fixed in a long hole formed in a natural ground, and the inside of the long pipe is divided into a plurality of spaces by partition walls provided at predetermined intervals in the longitudinal direction. , A plurality of discharge pipes are provided in the long pipe, the ends of the plurality of discharge pipes are opened to the plurality of spaces, and the congealing liquid is discharged from the front end openings of the plurality of discharge pipes. After filling the space, it is further permeated and hardened from the peripheral wall hole of the long pipe into the ground on the outer periphery of the long pipe to form a consolidated region in the ground on the long pipe and the outer periphery of the long pipe. Characteristic rock consolidation method. 2. The inside is divided into a plurality of spaces by partition walls provided at predetermined intervals in the longitudinal direction in the long holes formed in the natural ground,
Inserting and fixing a peripheral wall perforated long tube in which the plurality of spaces are in communication with the outside by a plurality of discharge tubes each of which has a tip opening into the plurality of spaces and the whole of which extends in the longitudinal direction. , After discharging the congealing chemicals from the tip openings of the plurality of discharge pipes to fill the respective spaces, further permeate and cure from the peripheral wall holes of the long pipes into the ground of the outer periphery of the long pipes, A method for consolidating natural rocks, characterized by forming a consolidating region in the natural rocks inside and outside the long pipe.