JPH09165994A - Shaft joint shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to join with an existing shaft while protecting the joining of an existing shaft from the collapse of the earth and sand in the joining area and maintain a high water stop ability. SOLUTION: A disk-shaped engagement groove 37 is formed on a shaft wall 35 with an over cutter 27 projected from a rotary cutter. A hood 17 of a shield frame 1 is engaged with the engagement groove 37, thereby preventing the collapse of earth and sand at the joining area and joining with a shaft where the engagement groove 37 formed on the shaft wall 36 is excavated and formed with an over cutter 27 projected from a rotary cutter 2 at the front of the shield frame 1 so that the chamfered surface may be exposed to the shield frame 1. Therefore, the tip of the hood 17 which moves along the shield frame 1 is joined with this engagement groove 37 and engaged therewith, thereby enhancing a water stop ability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft connection shield for connecting an existing vertical shaft.

[0002]

2. Description of the Related Art When joining a tunnel formed by a shield machine to an existing shaft, as shown in FIG. 11, a tunnel b is reached from the ground c side or the shaft b side in the vicinity of the shaft b reached by the machine a. A water stop zone d is formed in advance by injecting a chemical, and the excavator a is intruded into the water stop zone d to dismantle the water and perform penetration work to the shaft b.

[0003]

However, there are cases where the injection of medicine from the ground c side cannot be performed due to road conditions (traffic cannot be closed due to heavy traffic) and the presence of buildings. Further, the medicine injection from the vertical shaft b side may not be possible depending on the usage status of the vertical shaft b, such as when the work is already performed in the vertical shaft b.

Therefore, an object of the present invention is to provide a vertical shaft shield which can be connected to an existing vertical shaft without injecting chemicals from the ground side or vertical shaft side.

[0005]

In order to achieve the above object, a shaft joining shield according to the present invention is provided in the front portion of a shield frame formed in a cylindrical shape, and a rotary cutter that rotates to excavate a face. An overcutter which is provided on the rotary cutter so as to be able to project and retract toward the face of the face and which cuts a circular engagement groove in a vertical shaft wall to be joined by the rotation of the cutter, and is slidably mounted on the outer periphery of the shield frame. , And a hood fitted in the engagement groove by being moved to the face of the face.

In the shaft joint shield, a circular engagement groove is formed in the shaft wall by an overcutter protruding from the rotary cutter, and the hood of the shield frame is engaged with the engagement groove to prevent collapse of the earth and sand at the joint portion. It is designed to be joined to the shaft while preventing it. Here, since the engagement groove formed in the vertical shaft wall is excavated and formed by the overcutter protruding from the rotary cutter in the front portion of the shield frame, it is exposed to the shield frame. Therefore, the tip of the hood that moves along the shield frame comes into close contact with the engagement groove and engages with it, so that the waterproofness is enhanced.

As described above, the joining with the established pit is achieved without collapsing the earth and sand at the joining portion and maintaining a high water-stopping property, so that the chemical injection from the ground side or the shaft side becomes unnecessary.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a rotary cutter 2 that rotates to excavate a face is provided at the front of a shield frame 1 formed in a cylindrical shape. A rotary shaft 3 of the rotary cutter 2 is axially supported by a partition wall 4 that separates the face of the rotary cutter from the inside of the shaft, and a pinion 7 of a motor 6 is meshed with a gear 5 provided on the rotary shaft 3 to rotate the rotary cutter 2. It has become so.

In this embodiment, the shield frame 1 is a center-folding frame in which the front body 1a and the rear body 1b are flexibly connected via the center-folding jack 8 and the spherical seal 9. However, it may be a normal one. In the center folding frame, the rotary cutter 3 is attached to the front body 1a, and the shield jack 10 for propulsion is attached to the rear body 1b.

As shown in FIG. 2, the rotary cutter 2 includes five Katta spokes 11a to 11e arranged radially around the rotary shaft 3, bits 12 provided on each of the Katta pork 11, and a rotary shaft. 3 and a fishtail bit 13 provided on the end surface of A cutter 2 is placed inside each of the four cutas pork 11a, 11b, 11c, 11d.
An expansion / contraction jack 14 for expanding / contracting the excavation diameter is provided (see FIG. 1), and a copy cutter 15 is provided in a retractable manner inside the remaining one Kattus pork 11 e.

The expansion / contraction jack 14, as shown in FIG.
The rotary cutter 2 is substantially accommodated in the cutas pork 11a to 11d formed in the shape of a rectangular tube, and the extension portion 14b is moved in the radial direction with respect to the fixed portion 14a fixed to the support bracket 16. It expands and contracts the typical excavation diameter. Specifically, the excavation diameter of the cutter 2 when the expansion / contraction jack 14 extends is matched with the outer diameter of the hood 17 slidably mounted on the outer periphery of the front body 1a as shown in FIG. The excavation diameter of 2 corresponds to the outer diameter of the front body 1a as shown in FIG.

The extension portion 14b of the expansion / contraction jack 14 is guided by a resin plate 18 provided in a Kattus pork 11b formed in a rectangular tube shape, and moves in the radial direction. A guide groove 20 is formed on the fixed front plate 19 of the cutter spoke 11b along the moving direction. The guide groove 20 guides the engagement piece 21 provided in the extension portion 14b in the radial direction. A moving face plate 22 is provided on the engaging piece 21, and a bit 23 is provided on the moving face plate 22. Therefore, the bit 23 of the movable table board 22 is the bit 12 of the fixed table board 19.
On the other hand, it moves in the radial direction within the range of the expansion and contraction allowance 24 shown in FIG.

The copy cutter 15 is appropriately protruded and retracted outward in the radial direction from the tip portion of the cutas pork 11e in order to carry out overcutting on the inside of the curve when the curve is dug. The Kattus pork 11e provided with the copy cutter 15 is not provided with the expansion / contraction jack 14 in terms of space,
As shown in FIG. 2, its length is formed to match the radius of the front body 1a. This is to ensure the forward sliding movement of the hood 17 when it is joined to the existing vertical shaft.

An arc-shaped overcutter support member 25 is provided between the cutlass pork 11c and 11d and between the cutout 11e and 11a. Each of the overcutter support members 25 is provided with an overcutter accommodating portion 26, in which an overcutter 27 that freely protrudes and retracts toward the face of the face is accommodated. As shown in FIG. 1, the overcutter 27 is composed of a jack including a fixing portion 27a attached to the accommodating portion 26 and an extending portion 27b (see FIG. 4) extending toward the face, and the rotating cutter is extended during the extension. As shown in FIG. 8, the circular engagement groove 37 is cut and formed in the shaft wall 36 to be joined by the rotation of 2. In FIG. 4, 28 is a bit part.

The overcutter 27 is obliquely attached to the accommodating portion 26 so that the extension direction thereof is forward and outward in the radial direction, and the rotation diameter of the center line 30 at the maximum stroke tip position (extension position) 29. r is matched with the outer diameter R of the hood 17. Further, the accommodating portion 26 has a tubular sheath portion 32 that projects toward the cutter chamber 31 so that the extension portion 27b does not project toward the face when the overcutter 27 contracts. This sheath portion 32 is used for the rotary cutter 2.
It also functions as an agitator for kneading the soil in the cutter chamber 31 with the rotation of.

The cutter chamber 31 is a soil and sand intake chamber partitioned from the inside of the mine by the partition wall 4 to take in the earth and sand excavated by the rotary cutter 2. The earth and sand in the cutter room 31
It is intermittently discharged inside the mine by the screw conveyor 33. The screw conveyor 33 keeps the soil water pressure in the cutter chamber 31 (that is, the soil water pressure of the cutting face) at a predetermined value by appropriately opening and closing the gate 35 provided in the discharge port 34 to prevent the face from collapsing and to discharge the soil. To do.

A hood 17 is slidably mounted on the outer periphery of the front body 1a of the shield frame 1 so as to be fitted into the engagement groove 37 by being moved to the face of the face. The hood 17 is normally a front body 1 as shown in FIG.
It is overlapped with a and is moved forward as shown in FIG. 6 when it is joined to the shaft wall 36. In the normal state, the expansion / contraction jack 14 is extended and the excavation diameter of the rotary cutter 2 matches the outer diameter of the hood 17.
Since the plate thickness of the hood 17 does not serve as the excavation resistance, the expansion / contraction jack 14 is contracted at the time of joining, and the excavation diameter of the rotary cutter 2 is matched with the outer diameter of the front body 1a. Therefore, the forward movement of the hood 17 is secured. To be done.

A bracket 38 for slidingly moving the hood 17 in the axial direction is attached to the inner peripheral surface of the hood 17. The bracket 38 extends inside the front body 1a through a slide groove 39 formed in the front body 1a along the axial direction thereof. It goes without saying that the slide groove 39 is formed to have a length that satisfies the axial movement of the hood 17 during vertical shaft joining.

A cover member 40 formed so as to cover the slide groove 39 so as to allow the bracket 38 to move in the axial direction is attached to the inner peripheral surface of the front body 1a. A hood moving jack 41 mounted in the front case 1a is connected to the bracket 38 in the cover member 40. The hood moving jack 41 is normally removed from the front body 1a because it interferes with the center-folded jack 8 and the shield jack 10 as shown in FIG. 1 in space, and these jacks 8 and 10 are removed. At the time of vertical shaft joining, it is attached to the front body 1a as shown in FIGS.

The attachment of the hood moving jack 41 is performed as follows. First, the cylinder portion 41 a of the jack 41 is attached to the bracket 51 provided inside the front body 1 a with the pin 42. Then, the cover 43 in the axial direction of the cover member 40 is removed, and the rod portion 41b of the jack 41 is inserted into the cover member 40 through the opening. After that, the radial cover 44 of the cover member 40 is removed, and a hand is put through the opening, and the engaging bracket 45 at the tip of the rod portion 41b is joined to the bracket 38 of the hood 17 by the pin 46.

This completes the installation of the hood moving jack 41. As shown in FIG. 3, a plurality (eight) of the hood moving jacks 41 and the cover members 40 are provided at appropriate intervals in the circumferential direction. Hood 17
This is to obtain a force that opposes the frictional force due to the earth pressure of the side ground. In FIGS. 5 and 6, 47 is a soil and sand seal, and 48 is a nipple for injecting grease.

The operation of the vertical joint shield having the above structure will be described.

As shown in FIG. 7, in this construction example,
The vertical shaft connection shield S is close to the vertical shaft wall 36 of the vertical shaft with an upward slope of 5%, and is about to be connected to the vertical shaft with an upward slope of 5%. During this excavation, since the expansion / contraction jack 14 is extended as shown in FIG. 5, the plate thickness of the hood 17 does not become a resistance to the excavation.

Bonding is performed as follows. First, the shaft joining shield S is stopped immediately before the shaft wall 36 (about 400 mm). Then, while rotating the rotary cutter 2, the overcutter 27 is gradually extended to the full stroke, and the face is excavated into a circular groove having the same diameter as the hood 17.

When the overcutter 27 has reached the full stroke, the overcutter 27 is once retracted and stored, the shield S itself is advanced by the shield jack 10 while the rotary cutter 2 is rotated, and this operation is repeated. Fishtail bit 13 as shown
Is in contact with the shaft wall 36. After that, while rotating the rotary cutter 2 again, the overcutter 37 is gradually extended to the full stroke so that the vertical wall 3
6 is excavated, and a circular engagement groove 37 having the same diameter as the hood 17 is formed in the shaft wall 36.

Since the engaging groove 37 is formed by excavation by the over cutter 27 protruding from the rotary cutter 2 attached to the shield frame front body 1a, it is exposed to the shield frame front body 1a. . That is, the engagement groove 37 is vertically faced with respect to the vertical joint shield S, and is formed obliquely in accordance with the inclination of the ascending slope 5%.

The shaft wall 36 is preferably a flat surface,
Even if there is slight curvature or unevenness, overcutter 2
Any material can be used as long as it can be surfaced by the engagement groove 37 formed in 7. In addition, the welding angle is 5%
The angle is not limited to the above, and it is needless to say that the angle may be a little steep as long as the engagement groove 37 can be exposed.

As shown in FIG. 1, since the rotation diameter r of the centerline 30 at the maximum stroke tip position 29 of the overcutter 27 is matched with the outer diameter R of the hood 17, the overcutter 27 is extended to the full stroke and excavated. The diameter of the engagement groove 37 of the vertical shaft wall 36 thus formed matches the diameter of the hood 17. If such engagement groove 37 is formed in the shaft wall 36,
The over cutter 27 is retracted and stored, and the tail frame 49 and the segment 50 of the rear torso 1b are fixed and the shield S
To prevent retreat.

Then, as shown in FIG. 9, the unnecessary middle folding jack 8 and shield jack 10 are removed, and the hood moving jack 41 is attached (see FIG. 5). Then, as shown in FIG. 6, the expansion / contraction jack 14 is contracted to secure a movement path of the hood 17, the hood 17 is moved to the face of the face by the hood moving jack 41, and the tip 17a of the hood 17 is moved to the vertical shaft wall 36. The engagement groove 37 is engaged. Since the diameter r of the engaging groove 37 is matched with the diameter R of the hood 17, the tip 17a of the hood 17 closely contacts and engages with the engaging groove 37. The shape of the hood tip 17a is
Of course, it is formed obliquely according to the shape of the engaging groove 37.

Then, a solidifying agent is injected into the cutter chamber 31 from the inside of the mine through the partition wall 4 to seal the hood tip 17a and the engagement groove 37 with a very small clearance. Then, as shown in FIG. 10, the screw conveyor 33 is removed. At this time, since the inside of the cutter chamber 31 is solidified,
There is no eruption of earth and sand from the removal port 33a. And front torso 1
A medicine injection rod (not shown) is inserted from the nozzle 51 inside a toward the side ground, and the medicine is injected from the rod to solidify the ground. In FIG. 10, 52 shows a solidification zone. Since the nozzle 51 is covered with the hood 17 during a normal excavation, it is not clogged with earth and sand.

Finally, the solidified earth and sand are removed in the hood 17, the rotary cutter 2 and its drive motor 6 are removed, and the shaft wall 36 is broken to complete the connection with the shaft. The hood 17, the front body 1a, and the rear body 1b
Are left behind and become part of the tunnel.

As described above, the circular engaging groove 37 is formed in the shaft wall 36 by the over cutter 27 protruding from the rotary cutter 2.
Since the hood 17 of the shield frame 1 is engaged with the engaging groove 37 to join the shaft to the vertical shaft, the hood 17 prevents collapse of the earth and sand at the joint.

The engagement groove 37 formed in the shaft wall 36
Is excavated and formed by the overcutter 27 projecting from the rotary cutter 2 at the front part of the shield frame 1, so that it is faced to the shield frame 1. Therefore, the tip of the hood 17 that moves along the shield frame 1 comes into close contact with the engagement groove 37, and the waterproofness is enhanced.

As described above, since the joining with the established pit is achieved without collapsing the earth and sand at the joining portion and maintaining the high water-stopping property, it is possible to inject the medicine from the ground side or the shaft side, which has been conventionally required. It becomes unnecessary.

[0036]

As described above, according to the vertical shaft connection shield of the present invention, the connection with the established shaft can be achieved without collapsing the earth and sand of the connection part and maintaining a high waterproofness. Therefore, it is no longer necessary to inject chemicals from the ground side or the shaft side, which was required in the past.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vertical shaft joint shield showing an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is an explanatory diagram of an overcutter.

FIG. 5 is an enlarged view of a hood portion (before sliding).

FIG. 6 is an enlarged view of a hood portion (after sliding).

FIG. 7 is a diagram showing a process of joining to a vertical shaft (first stage).

FIG. 8 is a diagram showing a process of joining to a vertical shaft (second stage).

FIG. 9 is a diagram showing a process of joining to a vertical shaft (third stage).

FIG. 10 is a diagram showing a process of joining to a vertical shaft (fourth stage).

FIG. 11 is a diagram showing a conventional technique.

[Explanation of symbols]

 1 Shield frame 1a Front body 1b Rear body 2 Rotating cutter 17 Hood 27 Over cutter 29 Maximum stroke position r Rotating diameter R Outer diameter S Vertical shaft shield

Claims (2)

[Claims] 1. In a shaft connection shield that is connected to an existing shaft at the end of excavation, a rotary cutter that is provided at the front of a cylindrical shield frame and rotates to excavate a face, and the rotary cutter. An overcutter that is provided so that it can project and retract toward the cutting face and that cuts a circular engagement groove in the shaft wall to be joined by rotation of the cutter, and is slidably mounted on the outer periphery of the shield frame and moves to the cutting face. And a hood that is fitted into the engagement groove when the shaft is joined. 2. The over cutter according to claim 1, wherein the over cutter is obliquely attached to the cutter so that its extension direction is forward and outward in the radial direction, and the rotation diameter at the extension position matches the outer diameter of the hood. Vertical joint shield.