JPS63308196A - Excavator for tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a tunnel excavation device used for widening work of railway tunnels on commercial lines.

<Conventional Technology> In modern society, as traffic volume increases, it has become essential to widen roads, enlarge train bodies, and increase speeds.

Under these circumstances, it was inevitable that tunnel widening work would be carried out frequently.

In conventional tunnel widening work, the concrete in the tunnel is peeled off over a wide area, which may cause the surrounding ground to collapse, impairing the safety of the work.

In addition, especially in the case of tunnel widening work for railways on commercial lines, the work must be carried out within a limited period of time from the last train to the first train, making it extremely difficult to work efficiently and safely. Met.

Therefore, in order to solve the above-mentioned problems, the following tunnel widening method has conventionally been used.

This will be explained below with reference to the drawings.

(1) Drilling holes (FIG. 4) A plurality of holes 12 are drilled by an excavator from the inner peripheral surface of the concrete 11 of the tunnel 1 to be widened to the inside of the ground 2 located around the concrete 11.

Since the widening range of the tunnel 1 is determined by the depth of drilling in the ground 2, the holes 12 are drilled equally at a predetermined depth.

The opening area of the hole 12 is made as large as possible to reduce the area from which the concrete 11 will be removed later, so that the work of removing the concrete 11 can be easily performed.

However, if the opening area of the hole 12 is increased, the surrounding earth and sand will easily collapse (this will cause the rock bolt 3 described later to
When fixing, a plate (not shown) or the like slightly smaller than the opening area is used in combination to press down and reinforce the ground 2.

Also, depending on the strength of the ground 2, if the opening area is too large, the surrounding earth and sand may similarly collapse (this may occur), so it is necessary to open the hole 12 with a small enough area that a rock bolt 3, which will be described later, can be attached to it. .

In addition, as will be described later, the drilling interval and number of holes 12 are determined to be such that the rock bolts 3 fixed in the holes 12 can prevent the surrounding ground 2 from collapsing, and the concrete 11 can be peeled off. The hole spacing and the number of holes to be drilled are calculated by mechanical calculation, and holes are drilled over the entire inner peripheral surface of the concrete 11.

(2) Fixing the lock bolts (Fig. 4) Insert the lock bolts 3 into each hole 12, and
Drive into the ground 2.

Then, when the concrete 11 is removed, a predetermined tension is applied to the rock bolt 3 to prevent the surrounding ground 2 from collapsing.
and fixed by the bearing pressure plate 31.

At this time, as mentioned above, in order to prevent the collapse of the ground 2, a plate or the like may be attached together.

(3) Removal of concrete (Fig. 5) After fixing the rock bolt 3 in the hole 12 as necessary,
A small breaking hole 13 is opened in the concrete 11 between the holes 12.

Then, a serpentine arrow 14 or the like is inserted into the destruction hole 13 to destroy and remove the surrounding concrete 11.

(4) Removal of exposed ground (Fig. 6) The exposed ground 21 exposed by removing the concrete 11 is destroyed with a serpentine arrow 14 in the same way as the concrete 11.
Remove.

Therefore, only the convergence from the outer peripheral surface of the concrete 11 before widening to the exposed ground 2 after removing the exposed ground 21,
It has been expanded.

(5) Placing concrete (Fig. 7) After removing all of the exposed ground 21, with the rock bolts 3 still in place, new concrete 11 is poured on the surface of the exposed ground 2 for widening work. end.

When newly placing concrete 11, apart from the rock bolts 3, rock bolts exposed in the tunnel 1 for a long time are driven into the ground, and supporting materials are assembled in an arch shape on the exposed parts.

Then, position the formwork along the outer surface of the shoring material,
One possible method is to place concrete 11 in the space between the formwork and the ground 2.

Also, instead of driving another rock bolt as described above, the rock bolt 3 that was driven to prevent the collapse of the ground 2 is exposed for a long time inside the tunnel 1, and the formwork is similarly assembled on the exposed part. , a method of pouring concrete 11 is also considered.

The conventional techniques described above have the effect of preventing the collapse of the ground around the tunnel and safely, reliably, and quickly carrying out tunnel widening work.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a tunnel excavation device that can quickly, easily, and reliably excavate concrete for a tunnel in cases such as conventional tunnel widening work.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

Note that this embodiment will be explained using tunnel widening work as an example.

Bogie (Fig. 1.2) The bogie 4 has wheels 41 and is configured to be able to run on the rails 15 laid in the tunnel 1.

Outriggers 42 are attached to each of the four corners of the truck 4 so as to face downward.

Then, rail members 43 each having an H-shaped cross section are attached to the trolley 4 along both edges of the tunnel 1 in the extending direction.

Entrance〉Slide Plate (Fig. 1.2) The slide plate 5 is a plate-shaped body attached to the trolley 4 so that it can slide in the direction of extension of the tunnel 1.

Fitting members 51 having a C-shaped cross section are attached to the lower surface of the slide plate 5 at two locations so as to fit with the rail material 43 .

This allows the slide plate 5 to slide on the rail material 43.

Note that the slide plate 5 may be slid by a hydraulic device or the like.

Kuha〉Turntable The turntable 6 is a disk that is connected to the slide plate 5 by a rotating shaft or the like and can be rotated by a motor or the like.

2〉Boom up/down arm The boom up/down arm 7 has a rotating rod 7 at the upper end of the fixed arm 71 so that it can rotate in the circumferential direction of the tunnel 1.
It is a plate-shaped body with one end pivotally supported by 2.

The fixed arm 71 is a plate-shaped body fixed on the turntable 6 and protruding upward.

Then, as shown in FIG. 2, two fixed arms 71 are fixed on the turntable 6 in parallel with a predetermined interval,
A boom upper and lower arm 7 is connected to each upper end.

A connecting rod 73 is installed horizontally on the opposing surfaces of the two boom upper and lower arms 7 that are positioned in parallel at a predetermined interval in order to connect each of the boom upper and lower arms 7.

A boom vertical jack 74 is pivotally supported on the connecting rod 73, and one end of the boom vertical jack 74 is pivotally supported on the turntable 6.

Therefore, by extending and contracting the boom vertical jack 74 using hydraulic pressure or the like, the boom vertical arm 7 is moved to the rotating rod 7.
2 in the circumferential direction of the tunnel 1.

Cutter boom The cutter boom 8 has a cutter head 81 at one end, and the other end is located between the two boom upper and lower arms 7.

The free ends of the two boom upper and lower arms 7 and the cutter boom 8 are pivotally supported by a swinging rod 75.

The cutter boom 8 has a built-in motor, and the cutter head 81 is rotated by the motor so that the concrete 11 can be excavated.

The cutter head 81 rotates around the axis of the cutter boom 8, as shown in FIG. 1.2, and excavates a circular hole 12, and as shown in FIG.
It is conceivable that the excavator rotates around an axis perpendicular to the axis of the concrete 11 and excavates a band-shaped concrete 11.

Since the cutter boom 8 is configured to be extendable and retractable by a boom telescoping jack 82 operated by a hydraulic type or the like, the cutter head 81 attached to the tip thereof performs reciprocating motion in the axial direction of the cutter boom 8.

Go>Boom Position Correction Jack The boom position correction jack 83 is a hydraulically operated jack with one end pivotally supported on the cutter boom 8 and the other end pivotally supported on the boom upper and lower arms 7.

When this boom position correction jack 83 is expanded or contracted, the first
As shown in the figure, the cutter boom 8 moves like a pendulum around the swing rod 75, allowing the position of drilling in the concrete 11 to be finely adjusted.

Excavation method using the device of the present invention> First, the device of the present invention is placed on the rail 15 laid in the tunnel 1.

At this time, each outrigger 42 is extended until it reaches the ground, and a reaction force is applied to the ground so that the cart 4 does not fall or shift its position during excavation work of the concrete 11.

Next, the turntable 6 is rotated and positioned so that the cutter head 81 faces the concrete 11 side.

Further, the boom up/down jack 74 is extended and contracted, and the boom up/down arm 7 is rotated in the circumferential direction of the tunnel 1 to determine the circumferential position of the cutter boom 8.

Furthermore, the slide plate 5 is slid to determine the position of the cutter boom 8 in the extending direction of the tunnel 1.

Then, after making a slight position correction of the cutter boom 8 by extending and retracting the boom position correction jack 83, the boom telescoping jack 82 is extended while rotating the cutter head 81 to reach a predetermined depth inside the earth 2. excavate with

When excavating the concrete 11 on the wall of an adjacent line, the turntable 6 is rotated 180 degrees and the same process is performed.

Other Embodiments 1> Although the above description has been made regarding the use of the apparatus of the present invention in tunnel widening work, it can also be used in tunnel repair work in other cases.

First, a plurality of holes 12 are drilled from the inner surface of the concrete 11 of the tunnel 1 to the surface of the ground 2 using the apparatus of the present invention.

That is, unlike the above embodiment, only the concrete 11 is drilled, and the ground 2 is not drilled.

Next, a rock bolt 3 is inserted into the hole 12 and fixed to the ground 2, and only the concrete 11 between the holes 12 is removed.

Then, new concrete 11 is placed on the exposed ground 2.

Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

B) The boom cutter of the device of the present invention can determine the circumferential position of the tunnel by means of a jack, and can determine the position in the extending direction of the tunnel by means of a slide mechanism.

Therefore, by installing a cart equipped with a boom cutter in a predetermined position, concrete can be excavated over a wide range without moving the cart.

Therefore, there is no need to move the entire device every time the excavation position is changed (it is possible to shorten the working time and to perform the work easily).

As a result, as mentioned above, even when work needs to be carried out within a limited short period of time from the last train to the first train, such as in the case of widening work for railway tunnels on commercial lines, it is possible to adequately cope with the work.

By rotating the turntable, it is possible to excavate the concrete on the wall of the adjacent route.

Therefore, the time and effort of moving the trolley to the next line can be saved.

Kuha〉The cutter boom is configured to be extendable and retractable by means of a jack.

Therefore, the depth of concrete excavation can be adjusted freely.

Therefore, the device of the present invention can be used without replacing parts or the like.
In addition to tunnel widening work, repair work can be carried out while the tunnel remains as it is.

Kuni〉The position of the cutter boom can be subtly adjusted by adjusting the jack.

Therefore, accurate concrete excavation can be performed.

Kuho: The cart is equipped with an outrigger, which can apply a reaction force to the ground to prevent the cart from tipping over or shifting its position during concrete excavation work.

Therefore, work can be done safely and concrete can be excavated accurately in a stable condition.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of one embodiment of the apparatus of the present invention. Figure 2: A perspective view of the apparatus of the present invention. Figure 3: An explanatory diagram of other cutter heads. Figures 4 to 7:
Explanatory diagram of conventional technology Fig. 6 Fig. 7

Claims (1)

[Claims] A bogie that can run on rails laid in a tunnel and has an outrigger; a slide plate attached to the bogie so that it can slide in the direction of extension of the tunnel; and a slide plate that is rotatable on the slide plate. a turntable mounted on the turntable, an arm mounted on the turntable so as to be rotatable in the circumferential direction of the tunnel by a jack, a cutter boom pivoted on the free end of the arm and extendable and retractable by the jack, and a cutter boom attached to both ends. A tunnel excavation device consisting of a boom and a jack pivoted on an arm.