JPH0366900A - Agitating type machine for first receiving construction method - Google Patents

Abstract

PURPOSE:To enhance the easiness in working by furnishing rotary units, which rotate in the opposite directions to each other while they can slide in the longitudinal direction, and by equipping each unit with a bit, pouring cylinder, valve element, and a cylinder. CONSTITUTION:A guide shell 8 is inclined up, and a spreading-open bit D is set at the joint of a spraying top board E with a cutting vane G. Then a root packer 15 is pressure fitted for a specified depth, and rotation is made while the spreading-open bit D is shrunk closed, to actuate a feed motor 10, and a pilot hole is excavated. Then the spreading-open bit D is spread open, and a large dia, pile hole M is excavated by No.2 bits 27, 27, and a shafting 20 is drawn off while solidifying material is spouted out of a check valve, and the excavated soil is allowed to stagnate at the root packer 15 to preclude the solidifying material form counter-flowing. Then the spreading-open bit D is shrunk closed, to accomplish a pile. Thus the easiness in working is enhanced with two-gang spread-open bit device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a machine for use in an agitation type advance construction method for earth and sand tunnels.

[Prior Art] In mountain tunnels, the face (newly excavated part) must stand on its own for a short period of time while supporting the surrounding wall is being constructed. If the structure cannot stand on its own, or if it is only slightly collapsible, then a normal pre-loading platform (4 to 2m) is used. However, when dealing with collapsible sandy soil, sandy gravel, or fractured zones (rocks) that have almost no adhesive strength, a long pre-loading is required.

Conventionally, as shown in FIG. 10, holes are drilled every other hole using a rock drill, injected with fixing material, and reinforcing bars, pipes, or steel sheet piles are inserted. These forepile P
1S is used as a beam to protect the crown, and the arch T for stabilizing the face is constructed.

However, during drilling, drilling water loosens the ground around the face, accelerating deterioration, and top soil can be seen falling out from between the forepiles. Furthermore, when the forepiles are cast, the edges of the earth and the lower surface of the forepiles are cut, so there is a problem that the lower surface of the forepiles often peels off and falls.

Furthermore, as a matter of course, the longer the pile and the larger the diameter of the conventional pile, the higher the compressive strength. However, it is difficult to drill long, large-diameter holes with a horizontal auger, and furthermore, the excavation and injection of solidification material are performed in separate processes, resulting in poor workability.

Therefore, in Japanese Patent Application No. 63-230083, the present applicant proposed a horizontal auger equipped with a wing-spreading bit that can form piles of long, large-diameter face stabilizing arches with good workability.

According to the present proposal, an inner cylinder that is in sliding contact with each other and is movable relative to each other in the axial direction, and an outer cylinder that is provided with screw blades on the outer periphery;
a pair of first bits, the front end of which is pivoted to one axis of the inner cylinder end, and in which mutually obtuse-angled and parallel excavated parts are continuously formed; and the front end is a rear end of the first bit. a pair of second bits having a rear end pivotally connected to the front end of the outer cylinder and having an excavated portion formed on the outside; an injection cylinder inserted through the inner cylinder with a gap; A check valve is provided that opens when the solidified material that has passed through the inner hole of the injection cylinder and the gap reaches a predetermined pressure to mix and spray out the solidified material.

In the horizontal auger equipped with the expanded wing bit configured as described above, a pilot hole is drilled with the first bit in its original position, and after drilling to a predetermined depth, the inner cylinder is retreated by a predetermined stroke, and the first bit is removed. The second bit is expanded through the hole, the auger is pulled out, and a pile hole with a diameter larger than the pilot hole is excavated. At the same time, solidification material at a predetermined pressure is injected through the check valve, and both bits are used to mix the solidification material and excavated soil. At a predetermined depth from the inlet, the bit is closed and returned to its original position to form piles, and these piles construct an arch for stabilizing the face.

During construction, for example, as shown in Fig. 11, piles X are formed along the construction line at positions ffi#L#2, .
#12...Pile Y is formed so as to overlap the pile X formed before #19, and these piles X, Y
Build an arch Z to stabilize the face.

[Problems to be Solved by the Invention] The above proposal itself is effective; however, when the solidifying material is injected, the solidifying material may flow back toward the face side. Although this solidified material has a gel time, this phenomenon occurs due to the horizontal shaft (actually facing upwards), and it becomes a hindrance during construction.

Also, to form one pile, it usually takes about 1 minute for positioning.
It takes a total cycle time of about 10 minutes, about 3 minutes to set the bit, about 3 minutes to dig, and about 6 minutes to stir, pour, and mix. Therefore, in the construction mode shown in FIG. 11, the construction speed of one arch is considerably slow.

SUMMARY OF THE INVENTION An object of the present invention is to provide a machine for use in the advance construction method of earth and sand tunnels, which prevents the backflow of solidified material and speeds up the construction of arches for stabilizing the face.

[Problem] According to the present invention, rotary shaft units are provided that are slidably provided in the longitudinal direction of a stand that can freely rotate vertically and vertically for a self-propelled vehicle, and that rotate in mutually opposite directions. an inner cylinder and an outer cylinder that are movable relative to each other in the axial direction; and a pair of first cylinders, the front end of which is pivoted to one axis of the end of the inner cylinder, and a pair of first cylinders, each of which has a continuous excavated portion that is obtuse-angled and parallel to the other. bit and
A gap is provided between the inner cylinder and a second bit, the front end of which is pivotally connected to the rear end of the first bit, the rear end of which is pivotally connected to the front end of the outer cylinder, and an excavated part is formed on the outside. an injection cylinder inserted through the injection cylinder, a valve body that opens and spouts out the double-turning material when the double-turning material that has passed through the inner hole of the injection cylinder and the gap is at a predetermined pressure, and a front part of the outer cylinder. A cylindrical body is provided with a rear end that can be slid into the nuclear outer cylinder and covered with a gap.

[Function] In the machine for earth and sand tunnel advance construction method configured as above, the cylindrical body is press-fitted into the face wall to a predetermined depth, a pilot hole is drilled with the first bit in its original position, and a pilot hole is drilled to a predetermined depth. After drilling, the inner cylinder is moved back a predetermined stroke, the second bit is expanded via the first bit, and the rotary shaft unit is pulled out to drill a pile hole with a larger diameter than the pilot hole, and at the same time, a predetermined pressure is applied both times. The refining material is ejected and mixed with the excavated soil, and the first bit is closed at the end of the cylinder and returned to the original position to form piles, and these piles are used to construct piles for stabilizing the face.

At this time, the agitated excavated soil stays in the cylinder to prevent the solidification material from flowing back toward the face side.

Furthermore, two piles can be formed adjacently in one cycle time using two rotary shaft units.

[Example] The present invention will be described in detail below with reference to the drawings.

In FIGS. 1 to 3, a poom 3 is supported on a horizontal axis 1 of a self-propelled vehicle, which is generally designated by the symbol A, by a pair of left and right swing cylinders 2.2 so as to be able to freely rotate within an angular range θ1 of, for example, 160°. ing. A lift cylinder 4 is built into the pool 3, and a yoke 5 is fixed to the upper part of the operating rod of the cylinder 4. In that yoke 5,
The guide bracket 6 is supported by a tilt cylinder 7 interposed between both the guide brackets 5 and 6 so as to be able to move upwardly from the horizontal, for example, in an angle range θ2 of 200 degrees. For example, 800 m by the slide cylinder 9 interposed between both 7.
It is slidably supported with a stroke S1 of m.

On this guide shell 8, a pair of rotary shaft units, the entirety of which is indicated by reference numeral B, are provided at an interval W (for example, 350 mm) so as to be slidable in the longitudinal direction.

One end of the shaft body 20 of this unit B is connected to the feed motor 1
0 and feed chain 11, e.g. 3500 mm
The power swivel 12 is slid with the stroke S2 of
The other end is connected to an outer cylinder 21 (described later) of the shaft body 20.
The mouth packer 1 is a cylindrical body whose swivel 12 side is in sliding contact with the outer cylinder 21 and the opposite side is open.
5 and is supported by a guide shell 8 so that they can be rotated in opposite directions. A water swivel 13 (FIG. 4) is attached to the power swivel 12 by a bit expansion cylinder 14. In addition, the code|symbol 16 in a figure is a packer press-fit cylinder, 17 is a hose guide roller mentioned later, 18 is a switchboard, 19 is an operation panel, 2
2 is a hydraulic unit.

In FIG. 4, the outer cylinder 2 of the shaft body 20 of the rotating shaft unit B
An inner cylinder 24 is slidably inserted into the inner cylinder 24, and an injection cylinder 28 is inserted through the inner cylinder 24 with a gap C provided therebetween.

A pin 25 is provided perpendicularly to the extending portion 24a formed at the front end of the inner cylinder 24, and a pair of first
The front end of the bit 26.26 is pivotally mounted. In the original position shown in the drawing, this bit 26.26 has a mutually obtuse-angled excavation part 26a and a parallel excavation part 26b continuously formed.

The rear end of the bit 26.26 has a drilling section 27 on the outside.
A pair of second bits 27 and 27 formed with pin 2
5a, 25H, and this second bit 27.
The rear ends of 27 are pivotally connected to yoke-shaped brackets 23 provided at the front end of the outer cylinder 21 by pins 25b, 25)), and these two bits 26 and 27 constitute an expansion bit D. has been done. In addition, pins 25b, 2
The spacing between the pins 5b is slightly smaller than the spacing between the pins 25aN25a. Therefore, the bit expansion cylinder 14 moves the inner cylinder 24 into the outer cylinder 2 by a predetermined stroke.
1 (to the right in the drawing), the second bit 27.27 becomes the first bit 26.26, as shown in FIG.
It is being expanded by

In FIG. 6, a check valve 29, which is a valve body, is provided at the front end of the inner cylinder 24. A pair of opposing injection ports 31a and 31b are provided at the front and rear of the valve body 30, and their axes intersect with each other on the axis side of the pin 5. The injection port 31a is communicated with the inner hole 28a of the injection cylinder 28, and the injection port 31b is communicated with the gap C. Then, as shown in FIG.
8a and the gap C are the first in the water swivel 13.
The solidification material 13a and the second solidification material inlet 13b are connected to each other. Solidifying material supply hoses (not shown) are connected to these ports 1.3a and 13b, respectively, and these hoses are guided by hose guide rollers 17 (FIG. 1).
They are connected to a first solidification material supply pump and a second solidification material supply pump, which are not shown, respectively. And check valve 2
9 is the predetermined pressure of the double turning material (for example, 1.5 kgf/c &
), the valve is opened and the liquid is ejected from the injection ports 31a and 31b.

During excavation, as shown in FIG. 1, the self-propelled vehicle A is positioned on a part of the embankment formed on the spray board H in front of the face G in the tunnel F where the spray ceiling E is formed.

Next, as shown in FIG. 7, the guide shell 8 is tilted upward, and as shown in FIG. Set it in the section.

Next, as shown in FIG. 8, the packer press-fit cylinder 1
6 to press fit the mouth packer 15 to a predetermined depth. Then, rotate the expansion bit D while retracting and closing it,
The feed motor 10 is operated to move the expansion bit D forward via the power swivel 12 to drill the pilot hole to a predetermined depth K.

At this time, the excavated soil is not carried out backwards, but is stirred by the expansion bit D.

Next, as shown on the right side of FIG. 1, the bit expansion cylinder 14 is extended to move the inner cylinder 24 backward by a predetermined stroke, and the expansion bit D is expanded. and the second bit 27.2
A pile hole M having a larger diameter than the pilot hole is excavated in the excavated portions 27a and 27a (Fig. 5) of No. 7, and the first and second solidifying materials at a predetermined pressure are poured from the injection holes 31a and 31b of the check valve 29 in the direction indicated by the arrow. The feed motor 10 is rotated in the reverse direction and the shaft body 20 is pulled out while spouting as shown in FIG. At this time, the excavated soil is mouth packer 15
This serves to prevent the backflow of the solidifying material from flowing back toward the face G side.

Next, as shown in the right part of FIG. 1 and FIG. 3, the outer cylinder 21
When the bracket 23 reaches the base packer 5, the bit expansion cylinder 14 is retracted, the inner cylinder 24 is advanced by a predetermined stroke, the expansion bit D is retracted and closed, and a pile hole with the same diameter as the pilot hole is created. , form piles P and P (Figure 9), and move on to excavation at the next location.

During construction, as shown in Figure 9, for example, the outer diameter is 300 mm.
26 piles P are formed and the angle is 12 in the order of radius 4200.
When building an arch Q of 0°, piles P of #1 and #2
, P are formed at the same time in a cycle time of about 10 minutes as described above, and as a whole, 10 minutes x 26 lines/2 = 13
0 minutes, approximately twice the application speed of conventional methods.

[Effects of the Invention] Since the present invention is configured as described above, backflow to the solidified face side can be prevented by the mouth packer and the excavated soil.

In addition, by using two expansion bits, two piles can be formed at the same time, making it possible to build one arch at twice the speed of conventional methods, thereby shortening the construction period.

[Brief explanation of drawings]

Fig. 1 is a side view showing the overall configuration of an embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a top view of the main part, Fig. 4 is a side sectional view of the main part, and Fig. 5 is a front view. Side view of the expansion bit when it is expanded, No. 6
The figure is a sectional view taken along the line I-I in Fig. 4, Figs. 7 and 8 are side sectional views explaining the state during bit setting, packer press-in, and pilot hole drilling, respectively, and Fig. 9 is the construction state. FIGS. 10 and 11 are sectional views of the working face to explain the conventional construction state, respectively. A... Self-propelled vehicle B... Rotating shaft unit D... Expansion bit 8... Tilt shell 14... Bit expansion cylinder 15... Mouth packer 16...
Packer press-fit cylinder 20...Shaft body 21...
・Outer cylinder 24...Inner cylinder 26...First bit 27
...Second bit 28...Injection barrel 29...Check valve Fig. 5 Fig. 6 Fig. 7 Fig. 9 Fig. 10 Company!

Claims (1)

[Claims] Rotary shaft units that are slidably provided in the longitudinal direction of the base of the self-propelled vehicle and that rotate in opposite directions are provided, and each unit has an inner cylinder that is adjacent to each other and movable relative to each other in the axial direction. and an outer cylinder, a pair of first bits whose front ends are pivoted to one axis of the end of the inner cylinder and are formed with a series of mutually obtuse-angled and parallel excavated parts;
a second bit that is pivotally connected to the rear end of the bit, the rear end of which is pivotally connected to the front end of the outer cylinder, and has an excavated portion formed on the outside; and an injection cylinder that is inserted through the inner cylinder with a gap. and a valve body that opens and spouts out both solidified materials when the inner hole of the injection cylinder and the solidified materials that have passed through the gap are at a predetermined pressure, and a front part of the outer cylinder that is covered with a gap. 1. A machine for an agitation type advance construction method for earth and sand tunnels, characterized in that a cylindrical body whose end portion is slidable on the outer cylinder is provided.