JPH11257000A - Ground hardening construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the assembly work and injection work of an inserting pipe to be inserted into a steel pipe in a ground hardening construction method to a hard rock bed or a soft ground and to facilitate the execution of these works in safety with excellent workability and high efficiency. SOLUTION: A telescopic inserting pipe 4 is previously assembled in a contracted state in a factory so as to make a plurality of unit-pipes 4", 4", 4" mutually slidable, and an injection hose is compacted in a folded state and is easy in a carrying-setting and excellent in workability, and in the case of injecting a hardening agent into a natural ground 1, the inserting pipe is expanded inside a steel pipe 2, and the hardening agent is injected through mutually independent unit pipes 4", 4" or simultaneously a plurality of unit pipes to the natural ground 1. After injecting the hardening agent, the steel pipes 2 is left in the natural ground 1 to enable it to serve as a reinforcement. Thus the attaching work of the inserting pipe inside the steel pipe has such an advantage as it is extremely simple and can be smoothly carried out, and moreover has high safety, excellent execution efficiency and is inexpensive in cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of hardening to obtain a predetermined strength of a hard rock or soft ground when constructing a structure such as a tunnel on the soft ground.

[0002]

2. Description of the Related Art As is well known to those skilled in the art, when a tunnel or the like is formed in the ground, it is necessary to maintain a predetermined strength of the ground. In the case where it is insufficient, a technique of injecting a predetermined curing agent such as a urethane resin into the ground to harden the ground 1 artificially to harden the ground 1 has been adopted for a long time. As shown in FIG. 6, as shown in FIG. 6, the ground 1 is appropriately drilled and excavated, a steel pipe 2 having a predetermined injection hole formed therein is fitted into the drilled hole, and a predetermined hardening agent is inserted into the steel pipe 2. And insert one or a predetermined number of insert pipes 4 into the steel pipe 2 as a fore pile method so as to be injected into the ground 1 of the ground through the injection hole of the steel pipe, and a predetermined hardening through the insert pipe 4. The hardening agent is injected into the ground 1 of the ground through an injection hole (not shown) of the steel pipe 2. It was to improve the process.

[0003] In particular, in a pipe roof construction method for constructing a tunnel or the like in hard rock, the Trevi tube construction method and the AGF construction method have been put into practical use, but the contents of the work of assembling an insert pipe 4 inserted into a steel pipe 2 are as follows. Assembling heartwood,
There is a process of cutting the injection hose, assembling a static mixer, a joint and the like, and attaching the hose assembled to the core material.
Prepare several to dozens of insert pipes in the process, furthermore, it requires a narrow underground construction yard, several to dozens of dedicated workers are required, and the trouble that labor and man-hours increase there were.

[0004] In addition to the above-described steps, in order to feed a highly viscous curing agent by pressure, a packer or the like (not shown) must be attached to the insert pipe 4 in a single or double manner. There was a complicated trouble.

To cope with this, for example, Japanese Patent Laid-Open No. 6-3
As disclosed in the invention of No. 3683, a long hole is drilled in the ground of the ground, and an injection pipe provided with a predetermined number of discharge holes in the long hole is fitted in a bundled state. A technique has been developed in which a hardening agent is discharged from the substrate to infiltrate and harden into the ground to form a consolidated region of the ground.

[0006]

However, in the conventional ground hardening technique, since the insert pipe is fitted in the drilled hole, the drilled hole is hard for tunnel construction such as hard rock. It must be rock, and if it is applied to soft ground with a high water content, the drilled hole will collapse during construction, so it is impossible to insert the insert pipe deep into the drilled hole in the ground. There was a disadvantage that it was.

[0007] Moreover, the conventional technique can fill the hole in the ground with a hardening agent and inject it into the surrounding ground through a crack or the like. There is a problem that it is extremely difficult to infiltrate and penetrate a hardening agent such as a urethane resin-based hardening agent having high binding property into the ground uniformly and in line with the design accuracy.

In addition, in the ground hardening technique, the insert pipe cannot be directly carried into the work site with a predetermined length, and therefore, the insert pipe is manufactured into a plurality of unit pipes, and joints and the like are connected on site. Or bundle the insert tubes with cover tape,
In some cases, a packer or the like must be assembled as described above, and a hose for the expansion and contraction fluid of the packer must also be connected, and the workability is extremely poor. Only the hardening agent was filled, the penetration into the surrounding ground was not achieved, and therefore, there was a neck that was not able to obtain the predetermined hardness of the ground ground.

In the prior art, if the drilling is on soft ground, it may collapse and may not be applicable. In addition, since the steel pipe is not left after the construction with the steel pipe inserted, Another problem is that the strength of the soft ground cannot be sufficiently maintained.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to provide a fore-pile method for a ground such as a hard rock for tunnel construction based on the conventional and conventional techniques described above. The insert pipe inserted into the steel pipe fitted into the pipe is a fishing rod type telescopic method, easy to carry to the construction site, and the construction performance is good, the hardening of the ground as designed is hard rock of the ground, It is an object of the present invention to provide an excellent ground hardening method that can be hardened as designed, regardless of the soft ground, and that is beneficial to the field of civil engineering in the construction industry.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a steel pipe is inserted into a drilled hole in the ground to solve the above-mentioned problems. Then, a hardening agent is press-fitted into the steel pipe through an insert pipe, and injected into the ground through a plurality of injection holes formed in the steel pipe. A flexible telescopic type multi-pipe is brought into a reduced state to face the inlet of the steel pipe, and then each unit insert pipe is extended in the steel pipe to a predetermined length by an injection hose attached to the insert pipe. It is based on injecting a hardening agent into the ground through the hole of the extruded steel pipe, so that a packer for the steel pipe is arranged at a predetermined pitch interval on the insert pipe, If so the serial injection hose is connected so as to face the base inner surface of each unit tube insert tube,
Also, the injection hose is connected to the outer surface of the base of the insert tube facing the outer surface of the base of each unit tube, and in addition, a technical measure is taken such that the steel tube is left in the ground after hardening. is there.

[0012]

In the above-mentioned configuration, when a tunnel or the like is constructed on the ground of hard rock, or when a predetermined foundation work or the like is performed in the soft ground, when hardening the ground to a predetermined design hardness, Drilling a predetermined depth drilling in the ground, inserting a steel pipe into the drilling, while making the insert pipe a fishing rod type telescopic multiple pipe prior to the construction,
An injection hose is connected to each of the unit pipes of the insert pipe via a joint, and if necessary, a packer of a type such as a double packer is provided, and the insert pipe is folded so that an inlet of the steel pipe is formed. When the hardener is injected into the ground, the insert pipe is extended into the steel pipe by a predetermined length by a telescopic method, and a predetermined hardener is injected from the unit pipe at the tip or a predetermined number of the unit pipes. To ensure that the hardener is injected and penetrated into the ground of the ground through the injection hole of the insert pipe and the injection hole of the steel pipe. The injection accuracy is good, and after the construction is completed, the insert pipe is reduced and removed, and the steel pipe is left as a kind of muscle on the ground to improve workability and high safety. Cost of the bets in construction, and, in which to obtain achieving high efficiency.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG.

The same parts as those in FIG. 6 will be described using the same reference numerals.

In the illustrated embodiment, reference numeral 4 'denotes an insert pipe as an apparatus used in the ground hardening method which forms the gist of the invention of the present application, which has a fishing rod type telescopic structure as described below. The unit pipes 4 ″, 4 ″ of a predetermined length that are slightly different in outer shape and relatively slidable are assembled so that they can be relatively slidably fitted, and are manufactured at a factory. A stopper flange (not shown) is formed at an end of the unit tube 4 '' so that the unit tubes 4 '' and 4 '' do not slip off from each other, as shown in FIG. At the base end of each unit pipe 4 ″, a hardening agent injection hose 9 is integrally assembled in a folded state through a joint 8 to be formed into a compact shape and transported by truck to a construction site. Etc. Ri is easily carried in it can be so.

At the construction site, as shown in FIG. 1, prior to constructing a tunnel or the like on the ground of the ground 1 such as hard rock, urethane resin is used to maintain the ground at a design strength. In order to inject a hardening agent such as a system into the ground 1, a steel pipe 2 having a predetermined number of injection holes 2 ', 2'... As shown in FIG. 2, the insert tube 4 ′ is inserted into the steel tube 2 and the unit tube 4 ″ at the end is pulled out by the telescopic function, or is connected to the unit tube 4 ″ at the end. A predetermined number of unit pipes 4 ″ are pulled out in a predetermined manner and inserted into the steel pipe 2 by sliding them into the steel pipe 2 while preventing the unit pipes 4 ″ from coming off through the stopper flange.

At this time, the injection hose 9 in the folded state is also expanded accordingly, so that the injection operation is not affected at all.

In the embodiment shown in FIG. 2, when the injection hoses 9 are individually pumped in a predetermined manner via pumps (not shown), the injection holes 41 formed in each unit pipe 4 '' shown in FIG. The hardening agent is discharged from inside the steel pipe 2 and fills around the unit pipe 4 ′.
Is injected into the ground 1 of the ground through the injection hole 2 ″ of the ground, and penetrates into the ground.

When the designed amount of the hardener is completed at the site shown in FIG. 2, the insert pipe 4 'is further pushed into the steel pipe 2 from the root side to insert the hardener into the next stage. .

At this time, the injection hoses 9 for the respective unit tubes 4 "are connected independently to each other, so that the respective unit tubes 4" can be individually and independently simultaneously or simultaneously. Injection work can be performed.

When the pouring operation is completed, the insert pipe is retracted and pulled out of the steel pipe 2 together with the pouring hose 9, and the steel pipe 2 is left in the ground 1 of the ground so as to function as one muscle. To

Therefore, in the above-mentioned construction mode, assembling and carrying in of the insert pipe 4 ′ to be mounted on the steel pipe 2 are extremely easy, and are performed smoothly and smoothly.
Can be selectively and independently injected into the desired site.

As shown in FIG. 5, depending on the design, a packer 5 is provided in the middle of the unit pipe 4 '', and a hose 7 for expanding and contracting the packer 5 is attached to the unit pipe 4 ''. Set up
Further, depending on the design, a mode in which a static mixer 6 is interposed may be adopted in the middle part.

The connection mode of the injection hose 9 to each unit pipe 4 '' can be connected not only from the inside as shown in FIG. 2 but also from the outside depending on the design.

It should be noted that the embodiments of the invention of this application are not limited to the above-described embodiments. For example, the ground applied to the construction of a tunnel or the like is not limited to a hard rock, but may be a culvert in a soft ground. Of course, it can be applied to the hardening of the ground at the time of construction.

[0026]

As described above, according to the invention of the present application, the design hardness of the ground ground is basically increased at the time of constructing a tunnel for the ground such as hard rock or foundation work for the soft ground, and the strength and rigidity are enhanced. When a hardening agent such as a urethane resin is injected into the ground, a steel pipe is inserted into the ground through the hole as in the conventional mode, and an insert pipe is inserted into the steel pipe. The complicated work of assembling the core material and the joints for the on-site construction of the insert pipe can be omitted, the man-hour can be reduced, the work efficiency can be improved, and the insert pipe can be manufactured in a factory in advance. Therefore, there is an advantage that the manufacturing accuracy is improved and the cost is low.

Since the insert pipe is of a fishing rod type telescopic type, a plurality of unit pipes which can be slid relative to each other are reduced at the stage of factory production, and at the same time, an injection hose is used. Etc. can be folded and compact as a whole,
It is easy to carry in to the work site, and at the time of construction, the insert tube is stretched and inserted into the steel tube. As a result, the working efficiency is remarkably improved, and not only the construction period is shortened, but also the construction accuracy is remarkably improved.

Further, since the steel pipe after completion of the construction can be left in the ground to form a muscular body, an excellent effect of functioning to maintain the strength of the ground can be obtained.

In addition, since the insert pipe employs a telescopic method, a steel pipe, that is, a desired hardener injection site in the ground can be selectively slid in the length direction as desired to inject the hardener. This provides an excellent effect that the hardener can be injected into a desired portion of the ground in a predetermined manner.

Also, since each unit tube of the insert tube can be expanded and contracted as desired, it has independent curing injection circuits by the number of the unit tubes, and can be injected simultaneously or independently of each other. An effect with a degree of freedom in construction is achieved.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view of a contracted state of an insert pipe in an initial stage of construction according to the invention of the present application.

FIG. 2 is a partial cross-sectional side view showing a state of an injection state of a curing agent into the ground.

FIG. 3 is a partially enlarged perspective view of a steel pipe.

FIG. 4 is a partially enlarged perspective view of a unit tube.

FIG. 5 is a schematic side view of a packing of an insert tube and a static mixer.

FIG. 6 is a conceptual side view of a fore pile method based on a conventional technique.

[Explanation of symbols]

 1 ground 2 steel pipe 4 'insert pipe 8 injection hole 9 injection hose 5 packer 4' 'unit pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeto Megumi 6-22, Matsugaeda-cho, Kita-ku, Osaka-shi, Japan Inside of Basic Technology Co., Ltd. (72) Inventor Toshimasa Yamada 6, Matsugaeda-cho, Kita-ku, Osaka No. 22 Japan Basic Technology Co., Ltd. (72) Inventor Shinichiro Square

Claims (5)

[Claims] 1. A steel pipe is inserted into a drilled hole in the ground, and then a hardening agent is pressed into the steel pipe via an insert pipe and injected into the ground through a plurality of injection holes formed in the steel pipe. In the ground hardening method, the telescopic type telescopic multi-pipe of the insert pipe is reduced to face the inlet of the steel pipe, and then the insert is stretched to a predetermined length in the steel pipe. A soil hardening method characterized in that a hardening agent is pressed out of each unit insert pipe by means of an injection hose attached to the pipe and injected into the ground through a hole in the steel pipe. 2. A soil hardening method according to claim 1, wherein packers for steel pipes are arranged at a predetermined pitch interval in said insert pipe. 3. The soil hardening method according to claim 1, wherein the injection hose faces and connects to the inner surface of the base of each unit pipe of the insert pipe. 4. The soil hardening method according to claim 1, wherein the injection hose faces and connects to the base outer surface of each unit pipe of the insert pipe. 5. The soil hardening method according to claim 1, wherein said steel pipe is left in the ground after hardening.