JP3113635B2 - Composite injection non-widened steel pipe tip receiving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-expandable steel pipe preloading method for reinforcing a ground in front of a cutting face of a tunnel prior to excavating a tunnel (including an underground cavity for oil storage, etc.). Belongs to the technical field of tunnel excavation.

[0002]

2. Description of the Related Art When excavating a tunnel, in order to prevent loosening of earth and sand, rocks, rocks, etc. forming the excavated tunnel wall surface and to ensure the safety of construction, prior to excavation, the excavation face of the tunnel is cut. A widened steel pipe front-end drilling method that reinforces the ground and drills a tunnel is used.

In this method, as shown in FIG. 11, a steel pipe driving device A hits a rear end portion of a steel pipe B, so that the tunnel C is inserted into the ground E from the periphery of the excavation face D of the tunnel C. The steel pipe B is driven in a direction slightly outward in the axial direction, and thereafter, a urethane-based hardening agent is injected from the rear end of the steel pipe B into the ground E in front of the excavation face D of the tunnel C to form the ground E. With the improvement and the rigidity of the steel pipe B, the ground E in front of the excavation face D is reinforced and the tunnel C is excavated.

By the way, as described above, the steel pipe driving device A
When the steel pipe B is driven into the ground E by means of the steel pipe driving device A, the rear end of the steel pipe B protrudes toward the tunnel C due to the structure of the steel pipe driving device A. Excavation to excavate the rear end larger than the space F to be the tunnel C is required. In other words, it is necessary to separately cast concrete to a position where the space F to be the tunnel C is secured in order to cover the rear end portion of the steel pipe B protruding toward the tunnel C and the surplus portion G, and this requires material cost and construction. The problem of rising costs arises.

Therefore, as a tunnel excavation method capable of suppressing an increase in material costs and construction costs, the present applicant connects a resin pipe to the rear end of a steel pipe, and connects the steel pipe with the rear end in front of the face. By penetrating into the ground until it is located outside the excavation area, injecting a hardening agent into the ground through the steel pipe, and excavating the face with the resin pipe remaining in the excavation area,
A method of excavating a tunnel without excavation without excavation was proposed (Japanese Patent Application No. 9-365460).
issue).

[0006]

When a tunnel is excavated by using the non-widened steel pipe precedent drilling method, hardening is performed by injecting into the ground through a steel pipe in the same manner as in the wide steel pipe precedent drilling method. As the agent, use of urethane-based or silica resin-based agents may be considered depending on the local requirements. The reason for this is that it has the characteristic of rapid hardening, and in particular, has the effect of not only hardening the ground, but also suppressing the leakage of groundwater that tends to flow to the face side through steel pipes arranged in the ground. It is.

However, since the curing agent such as urethane as described above has a low curing strength to the ground, it may not be possible to sufficiently reinforce the ground depending on the site of the ground. For example, as shown in FIG. In addition, it was necessary to arrange the steel pipes A in multiple steps around the tunnel C to reinforce the ground E. In addition, urethane-based hardeners are expensive and there is a problem that the material cost and the construction cost which cannot be solved even by the non-widening steel pipe tip receiving type excavation method increase.

Therefore, the present invention has an effect of suppressing the leakage of groundwater flowing from the ground to the tunnel side through a steel pipe when reinforcing the ground in front of the excavation face of the tunnel prior to excavating the tunnel. It is an object of the present invention to provide a composite injection non-widened steel pipe front receiving method capable of maintaining and enhancing the hardening strength of the ground. In the composite injection non-widened steel pipe pre-installation method according to the present invention, the tunnel includes an underground cavity for oil storage or the like.

[0009]

In order to solve the above problems, the present invention uses the following means.

First, the invention according to claim 1 of the present application (hereinafter referred to as the invention)
Prior to the excavation of the tunnel,
A steel pipe with a resin pipe connected to the rear end is disposed in the ground from the periphery of the excavation face of the tunnel to the ground in the axial direction or slightly obliquely outward, and the steel pipe is moved from the rear end of the resin pipe to the inside of the steel pipe. Injecting a hardening agent into the ground through, then, a composite injection non-widening steel pipe front receiving method of removing the resin pipe, and into the steel pipe from the rear end of the resin pipe exposed on the near side of the face After inserting a hardening agent injection pipe, a quick-hardening hardening agent is injected into a predetermined range on the face side of the ground through the steel pipe, and then a high-strength hardening agent is deeper than the predetermined range of the ground. It is characterized by injection.

[0011] The invention according to claim 2 (hereinafter referred to as the second invention) relates to the composite injection non-widened steel pipe front receiving method of the first invention, wherein at least two or more hardening agent injection pipes are used. The invention according to claim 3 (hereinafter, referred to as a third invention) is characterized in that a quick-hardening hardener and a high-strength hardener are supplied from different passages using an independent passage of The present invention relates to a method for receiving a composite-injected non-widened steel pipe according to the first or second aspect of the present invention, wherein a silica resin-based hardening agent is used as a quick-hardening agent and a cement-based hardening agent is used as a high-strength hardening agent. It is characterized by.

With the above arrangement, the following effects can be obtained according to the present invention.

According to the first aspect of the present invention, a steel pipe having a resin pipe connected to a rear end thereof is disposed from the periphery of the excavation face of the tunnel to the ground in the axial direction of the tunnel slightly obliquely outward.
After inserting the hardener injection pipe from the rear end of the resin pipe exposed on the front side of the face, the hardener is injected from the injection pipe into the ground via a steel pipe. The quick-hardening agent is injected into a predetermined area of the ground on the face side, and the hardening agent hardens in the steel pipe and the ground near the steel pipe. Will be suppressed.

Next, a high-strength hardener is injected deeper than the above-mentioned predetermined range of the ground, but since a quick-hardening hardener is hardened in the predetermined range of the ground near the face. Even if the high-strength hardener hardens over a relatively long time, it does not flow to the face side by the groundwater. Moreover,
The high-strength hardener stays in the steel pipe and the ground to be hardened, whereby the hardening strength for the ground can be increased.

If the face is excavated together with the resin pipe remaining in the excavation area, the tunnel can be excavated without requiring extra excavation.

According to the second aspect of the present invention, a hardening agent injection tube having at least two or more independent passages is used, and a quick-hardening hardening agent and a high-strength hardening agent are supplied from different passages. Therefore, the quick-curing curing agent and the high-strength curing agent do not mix, and the characteristics of each curing agent can be sufficiently exhibited.

According to the third aspect of the present invention, a silica resin-based hardening agent is used as a fast-setting hardening agent and a cement-based hardening agent is used as a high-strength hardening agent. it can. In addition, since the cement hardening agent is inexpensive, it is possible to suppress an increase in material cost.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for receiving a composite-injected non-widened steel pipe according to an embodiment of the present invention will be described.

First, as an example of a steel pipe used in this method, as shown in FIG. 1, this steel pipe 1 has a groove 1b in the circumferential direction of the outer peripheral surface of a tip 1a and a longitudinal direction from the tip 1a. A plurality of injection holes 1c... 1c at predetermined intervals;
The inner peripheral surface of the rear end 1d has a threaded portion 1e.

Then, a cylindrical tip 2 is attached to the steel pipe 1.
A resin tube 2 having a screw portion 2b and a plurality of injection holes 2c... 2c at predetermined intervals in the longitudinal direction from the distal end portion 2a on the outer peripheral surface of the resin tube 2 is connected by screwing with both screw portions 1e and 2b. Have been.

A drill 3 is provided in the groove 1b of the steel pipe 1.
The drill 3 is rotatably mounted by engaging the mounting members 3a... 3a provided on the rod 4 and the rod 4 inserted from the rear end 2d of the resin pipe 2 into the steel pipe 1.
Is attached to the rear end 3b of the drill 3. The rod 4 is detachable from the drill 3.

Next, a description will be given of the excavation of a tunnel using the composite injection non-widened steel pipe tip receiving method of the present invention.

First, as shown in FIGS. 2 to 4, in a state where the drill 3 is attached to the steel pipe 1, the drill 3 is connected to the steel pipe driving device 5 via the rod 4. The steel pipe 1 is set in the steel pipe driving device 5.
The drill 3 is provided with a rotating force from a steel pipe driving device 5 via a rod 4 to drill a ground 6.

That is, the drill 3 attached to the tip 1a of the steel pipe 1 is pressed against the periphery of the excavation face 8 of the tunnel 7, and the drill 3 is grounded by the rotational force given from the steel pipe driving device 5. While drilling the mountain 6, it rushes into the ground 6 ahead. At this time, the steel pipe 1 is drawn into the ground 6 by the driving force of the drill 3.

When the rear end 1d of the steel pipe 1 is pulled out of the excavation area 9 in front of the excavation face 8, the rotation of the drill 3 is stopped, and the rod 4 mounted on the drill 3 is stopped. Is removed. In addition, the said drill 3
It is left in the ground 6 while being attached to the steel pipe 1.

In this way, after the steel pipe 1 is drawn into the ground 6, the hardener is injected. In the present embodiment, for example, as shown in FIGS. The hardener is injected using the hardener injection unit 10.

The curing agent injection unit 10 includes an injection main pipe 11, a first silica resin-based curing agent injection tube 12, a second silica resin-based curing agent injection tube 13, a third silica resin-based curing agent injection tube 14, and an air release tube 15 And a cement-based hardener injection pipe 16.

The injection main pipe 11 is made of a synthetic resin and has a cross section perpendicular to the axial direction, and has a shape like a lotus root. The injection main pipe 11 is axially spaced 90 degrees apart in the circumferential direction. 11a ... 11a extending in four directions
And a through-hole 11b extending in the axial direction at the center in a cross section orthogonal to the axial direction, and four recesses 11c... 11c extending in the axial direction so that the thickness of the cross-sectional portion is uniform.

The tube holding grooves 11a... 11
The shape of a is Ω-shaped in a cross section orthogonal to the axial direction of the injection main pipe 11, and the opening width to the outer peripheral surface of the main pipe 2 is smaller than the inside of the tube holding grooves 11a. The opening width is smaller than the outer diameters of the first to third silica resin-based curing agent injection tubes 12 to 14 and the air release tube 15. These four tubes 12 to 15 are made of an elastic synthetic resin, and are deformed and mounted in the tube holding grooves 11a... 11a. One of the pipes 12 to 15 is a tube holding groove 11a.
1a.

The through hole 11b has a shape for fitting and holding the cement hardening agent injection pipe 16.

Further, near the both ends of the outer peripheral surface of the injection main pipe 11, cylindrical first and second packers 17a and 17b, which are covering members generally called packers, are squeezed at both ends. Each is attached by a belt 18. In addition, both packers 17a and 17b
It is made of a material through which the silica resin-based curing agent can pass.

Then, the rear end side of the injection main pipe 11 (FIG. 5)
At the center of the first packer 17a located on the right side in the side view, the distal end portion 12a of the first silica resin-based curing agent injection tube 12 is located at the distal end side of the injection main pipe 11 (the left side in FIG. 5 side view).
The tip 13a of the second silica resin-based curing agent injection tube 13 is located at the center of the second packer 17b, and the third silica resin-based curing agent injection tube 14 is located at the center between the first and second packers 17a and 17b. Of the steel pipe 1 is provided at each of the end portions 14a of the steel pipe 1.
Near the tip 15a of the air release tube 15 (FIG. 8)
Reference).

In addition, the cement-based hardener injection pipe 1
6 is provided at a position away from the second packer 17b by a predetermined distance from the second packer 17b. The cement-based hardener injection pipe 16 is made of a synthetic resin.

Incidentally, the above-mentioned four meat slack portions 11c... 11
The end on the front end side of c is closed by filling members 19. Also, the first and second packers 17a, 17b
Tube holding groove 11a so that the inside becomes a closed space
11a are provided with groove filling members 20 at predetermined positions.

Next, the hardener injection step using the hardener injection unit 10 will be described. As shown in FIG. 8, the hardener injection unit 10 is connected to the air vent tube 15 from the rear end 2c of the resin tube 2. The first packer 1 is inserted at the leading end 15a side of the
The hardening agent injection unit 10 is set at a predetermined position in the steel pipe 1 so that 7a is located. The rear ends of the first to third silica resin-based hardening agent injection tubes 12 to 14 of the hardening agent injection unit 10 are provided with a silica resin-based hardening agent injection device 22 for supplying a silica resin-based hardening agent 21.
(See FIG. 5), and the rear end of the cement-based hardening agent injection pipe 16 of the hardening agent injection unit 10
It is connected to a cement-based hardener injecting device 24 (see FIG. 5) that supplies the cement-based hardener 23.

Then, first, the urethane-based curing agent 21 supplied from the silica resin-based curing agent injection device 22 is first to first.
The distal ends 12a to 14a of the third silica resin-based hardening agent injection tubes 12 to 14 are injected into the ground 6 through a plurality of injection holes 2c... 2c provided in the resin tube 2, and the silica resin-based hardening agent 21 is hardened. After the cement hardener 2 supplied from the cement hardener injecting device 24,
3 is injected into the ground 6 from the tip 16a of the cement-based hardener injection pipe 16 through a plurality of injection holes 1c... 1c provided in the steel pipe 1.

Next, after the cement hardening agent 23 injected is hardened, the silica resin hardening agent injection device 22
To first to third silica resin-based curing agent injection tube 12
Are removed, and the cement-based hardener injection pipe 16 is removed from the cement-based hardener injection device 24. Then, as shown in FIG. 9, the excavation face 8 of the tunnel 7 is excavated by an excavator (not shown) together with the resin pipe 2 and the hardener injection unit 10 remaining in the excavation area 9 in front of the excavation face 8.

As described above, according to this composite injection non-widened steel pipe front receiving method, the resin pipe 2 can be connected to the rear end 1d of the steel pipe 1 and the drill 3 can be rotated to the front end 1a of the steel pipe 1. The steel pipe 1 and the resin pipe 2 are drilled into the ground 6 by the driving force of the drill 3 and
d is pulled in until it is located outside the excavation area 9 in front of the excavation face 8. Therefore, since the steel pipe 1 is not driven into the ground 6 by hitting the rear end 2c of the resin pipe 2, the resin pipe 2 remains in the excavation area 9 without being destroyed, and the rear end 2c is located on the front side of the cutting face 8. Will be exposed. As a result, after the hardener injection unit 10 is inserted from the rear end 2c of the resin pipe 2, the hardener is injected from the hardener injection unit 10 into the ground 6 via the steel pipe 1. .

In this case, first, the tip 12a of the first silica resin-based curing agent injection pipe 12 of the curing agent injection unit 10 and the second silica resin-based curing agent injection pipe 1
The silica resin-based curing agent 21 is supplied into the first and second packers 17a and 17b from the front end portion 13a of the third resin material 3 and the silica resin-based curing agent 2 is supplied through both the packers 17a and 17b.
1 is injected into the ground 6 through injection holes 2 c... 2 c provided in the resin tube 2, and a silica resin-based curing agent 21 is provided in the resin tube 2 from the tip 14 a of the third silica resin-based curing agent injection tube 14. Are injected into the ground 6 through the injection holes 2c. Then, after the hardening agent 21 is hardened, a cement hardening agent 23 is injected into the ground 6 through a plurality of injection holes 1c... 1c provided in the steel pipe 1 from the tip 16a of the cement hardening agent injection pipe 16. You.

Therefore, the hardening silica resin-based hardening agent 21 is first injected into the predetermined area a of the ground 6 on the face 8 side, and the hardening agent 21 is injected into the resin pipe 2 and the ground around the resin pipe 2. Since it hardens within 6 in a short time, it is possible to suppress the leakage of groundwater that tends to flow out to the face 8 side. next,
A high-strength cement-based hardener material 23 is injected into a predetermined range b on the back side of the ground 6 other than the predetermined range a, but the silica resin-based hardener 21 is hardened in a predetermined range of the ground 6 on the face 8 side. Therefore, even if the cement-based hardening material 23 hardens over a relatively long time, the hardening agent 21 does not cause groundwater to leak to the face 8. Moreover,
The high-strength cement-based hardener 23 stays in the steel pipe 1 and the ground 6 to be hardened, whereby the hardening strength for the ground 6 can be increased.

After the cement hardening material 23 has hardened, if the cutting face 8 is excavated together with the resin pipe 2 remaining in the excavation area 9, the resin pipe 2 in the ground 6 and the silica resin hardening agent 21 Most will be removed with less negative impact on the environment.

As a result, the tunnel 7 can be excavated without the need for excavation, and in addition, a low-cost, high-strength cement-based hardening agent 23 is used together, and as shown in FIG. Since the steel pipes 1 are arranged in a staggered manner,
The cement-based hardening agent 23 injected into the ground 6 from above is overlapped, and it is possible to obtain the hardening strength for the ground 6 only by making the steel pipe 1 overlap the tunnel 6 around the tunnel 6 in two steps inside and outside. Become. As a result, increases in material costs and construction costs can be significantly suppressed.

The first and second packers 17a, 17b
Accordingly, the silica resin-based curing agent 21 can be efficiently injected into the predetermined range a of the ground 6 without diffusing.

Further, the cement hardening agent injection pipe 16
The tip portion 16a is provided at a position away from the second second packer 17b by a predetermined amount on the tip side, so that the tip portion 16a is not blocked by the silica resin-based curing agent 21 and the cement The system hardener 23 can be injected into the ground 6.

The tip 1 of the air vent tube 15
5a is a tip 16a of a cement-based hardener injection pipe 16
Even if the silica resin-based curing agent 21 is hardened first and the rear end side in the steel pipe 1 is closed, the air remaining in the steel pipe 1 is removed by the air release tube 15. Is discharged to the outside of the steel pipe 1.
Thereby, the cement-based hardener 23 can be smoothly supplied into the steel pipe 1 from the cement-based hardener injection pipe 16 without the air remaining in the steel pipe 1 becoming a resistance. Moreover, when the hardener 23 flows out of the steel pipe 1 through the air release tube 15, it can be confirmed that the cement hardener 23 has been filled into the steel pipe 1 and the ground 6 around the steel pipe 1.

[0046]

As described above, according to the first aspect of the present invention, a steel pipe having a resin pipe connected to the rear end portion is inserted into the ground from the periphery of the excavation face of the tunnel in the axial direction of the tunnel or slightly obliquely outward. After inserting the hardener injection pipe from the rear end of the resin pipe exposed on the front side of the face, the hardener is injected from the injection pipe into the ground via the steel pipe. In this case, however, a quick-setting hardening agent is first injected into a predetermined area of the ground on the face side, and the hardening agent is hardened in the steel pipe and the ground near the steel pipe, so that the face is hardened. Leakage of groundwater that tends to flow to the side will be suppressed.

Next, a high-strength hardener is injected deeper than the above-mentioned predetermined area of the ground, but since a quick-hardening hardener is hardened in the predetermined area of the ground near the face. Even if the high-strength hardener hardens over a relatively long time, it does not flow to the face side by the groundwater. Moreover,
The high-strength hardener stays in the steel pipe and the ground to be hardened, whereby the hardening strength for the ground can be increased.

When the face is excavated together with the resin pipe remaining in the excavation area, a tunnel can be excavated without requiring extra excavation.

According to the second aspect of the present invention, a hardening agent injection tube having at least two or more independent passages is used, and a quick-hardening hardening agent and a high-strength hardening agent are supplied from different passages. Therefore, the fast-curing curing agent and the high-strength curing agent do not mix, and the characteristics of each curing agent can be sufficiently exhibited.

According to the third aspect of the present invention, the same effect as that of the first aspect can be obtained because a silica resin-based hardening agent is used as a fast-setting hardening agent and a cement-based hardening agent is used as a high-strength hardening agent. it can. In addition, since the cement hardening agent is inexpensive, it is possible to suppress an increase in material cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a steel pipe or the like used in a composite injection non-widened steel pipe tip receiving method according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating excavation of a tunnel using a composite injection non-widened steel pipe tip receiving method according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2;

FIG. 4 is an enlarged cross-sectional view of another main part illustrating a tunnel using the composite injection non-widened steel pipe tip receiving method according to the embodiment of the present invention.

FIG. 5 is a partially cutaway front view showing a hardening agent injection unit used in the composite injection non-widened steel pipe tip receiving method according to the embodiment of the present invention.

FIG. 6 is an enlarged sectional view taken along the line II in FIG. 5;

FIG. 7 is a cross-sectional view of a portion c in FIG. 5 viewed from the same direction as the line AA in FIG. 6;

FIG. 8 is another enlarged cross-sectional view of a relevant part explaining the excavation of a tunnel using the composite injection non-widened steel pipe tip receiving method according to the embodiment of the present invention.

FIG. 9 is another enlarged cross-sectional view of a main part, similarly illustrating excavation of a tunnel.

FIG. 10 is an enlarged sectional view taken along the line AA of FIG. 2;

FIG. 11 is a cross-sectional view illustrating excavation of a tunnel by a conventional widened steel pipe excavation method.

FIG. 12 is an enlarged cross-sectional view as viewed from the o-o line in FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Resin pipe 6 Ground 7 Tunnel 8 Excavation face 10 Hardener injection unit (hardener injection pipe) 19 Silica resin hardener (rapid hardener) 20 Cement hardener (high-strength hardener)

Claims (3)

(57) [Claims] Prior to excavation of a tunnel, a steel pipe having a resin pipe connected to a rear end thereof is disposed from the periphery of the excavation face of the tunnel to the ground in an axial direction of the tunnel or slightly obliquely outward. Injecting a hardening agent into the ground through the inside of the steel pipe from the rear end of the resin pipe, and then removing the resin pipe by a compound injection non-widening steel pipe tip receiving method, which is exposed on the front side of the face. After inserting a hardening agent injection pipe into the steel pipe from the rear end of the resin pipe to be injected, a quick-hardening hardening agent is injected into the predetermined area on the face side of the ground through the steel pipe, and then a high-strength hardening agent is injected into the steel pipe. A compound injection-free widened steel pipe tip receiving method characterized by injecting into deeper than the predetermined range of the ground. 2. A curing agent injection tube having at least two or more independent passages, wherein a fast-curing curing agent and a high-strength curing agent are supplied from different passages. 2. The method for receiving a composite injection non-widened steel pipe tip according to item 1. 3. The composite-injected non-widened steel pipe according to claim 1, wherein a silica resin-based hardening agent is used as the fast-setting hardening agent, and a cement-based hardening agent is used as the high-strength hardening agent. Prior construction method.