JPH0788754B2 - Lifting device for tunnel wall - Google Patents

Description

TECHNICAL FIELD The present invention relates to a suspension device for a tunnel wall surface for mounting a tunnel wall surface.

《Prior art》 When the relative strength of the tunnel decreases due to the deterioration of the existing tunnel itself or the addition of structures on the ground, constructing a new tunnel has a large economic burden. May be dealt with.

Under such conditions, it is desirable to reinforce the tunnel as it is without changing the inner diameter of the tunnel. To meet this requirement, the wall surface of the existing tunnel is once made into an arch shape according to its cross-sectional shape. It is considered that the construction is carried out by arranging the reinforcements and the reinforcements in the grooves obtained by the reinforcements, and then placing concrete again from the tops of the reinforcements.

A generally known machine for this type of lifting machine is a hammer.This hammer has multiple bits, and while the bits are pressed against the wall on which they are to be lifted, the bits are hacked by air pressure. By vibrating and hitting the bit, the concrete wall surface is hung down to a predetermined width and depth according to its shape and length.

These hammers are generally mounted on the tip of the boom of heavy machinery or used on the tip of the boom of a special machine.

By the way, since the cross-sectional shape of the tunnel has an arched shape as a lifting device for a tunnel, for example, a lifting device provided with a hammer at the tip of an expandable boom that turns according to the arched wall surface of the tunnel is desirable. With the device configured in this way, it is possible to mount the tunnel wall surface while rotating the boom, and if the tunnel diameter is the same and there are many mounting points, it is sufficient to repeat the same work. Can be realized.

However, there are the following technical problems in actually using the device configured as described above.

<< Problems to be solved by the invention >> That is, in this type of hammer that hangs the wall surface by the impact force of the bit, the force of pressing the bit against the wall surface changes the shaving force, and even if it is pressed too strongly, If the force is too weak, the efficiency will decrease, so it is desirable to always press with an appropriate pressing force.

In this case, since the hammer used conventionally has an extremely large weight, the hammering force of the hammer changes depending on the swing angle of the boom if the boom is simply supported by the telescopic boom.

In other words, when hanging on the tunnel wall, when the position of the boom supporting the hammer turns, there is no effect of the hammer's own weight when the boom is horizontal, but as the angle gradually rises from this point, the gravity The effect becomes obvious and the weight becomes maximum when the boom is positioned vertically.

Therefore, for example, if the pushing force of the bit is set to an optimum value with the boom being horizontal, the pushing force of the bit will decrease due to the weight of the hammer when the boom becomes vertical,
This reduces the lifting force.

On the other hand, contrary to the above, when set in the vertical state, the pressing force becomes too large when the boom becomes horizontal, and the lifting force similarly decreases.

The present invention is intended to solve such a problem, and provides a device for lifting a wall surface of a tunnel in which the pressing force against the wall surface of the hammer is changed according to the turning angle of the boom so that the lifting force can be constantly controlled. It is provided.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a gantry installed so as to be able to travel inside a tunnel, and a swivel and expansion / contraction according to the cross-sectional shape of the tunnel wall on the gantry A boom pivotally supported, a hammer provided with a bit for lifting provided at the tip of the boom, a swing drive device for the boom and a jack for expansion and contraction, and detection means for detecting the swing angle of the boom, The vertical component of gravity applied to the hammer is calculated according to the angle of the boom detected by the detecting means, and the jack is controlled so that the pressing force of the bit against the tunnel wall surface is always constant based on this. And a control means.

<Operation> With the above-mentioned device for slinging a tunnel wall, the boom is swung while pressing the hammer bit along the arch shape of the tunnel wall while vibrating the bit to suspend the tunnel wall.

At this time, the jack pressure is changed so that the pressing force of the bit becomes constant in accordance with the vertical component force of gravity applied to the hammer according to the turning angle of the boom, so that the tunnel wall surface is fixed with a constant lifting force. You can

<< Example >> An example of the present invention will be described below in detail with reference to the drawings.

1 and 2 show a device for hanging a tunnel wall surface according to the present invention.

This lifting device is capable of turning on a rail 2 laid in a tunnel shaft 1 so that it can travel on a rail 2 via a plurality of pairs of upper and lower traveling rollers 3, and a shaft 5 centered on the widthwise center of the base 4. A pair of fixed booms 6 supported by the movable booms 7 and a pair of movable booms 7 arranged on the upper part of the fixed booms 6 so as to extend and contract.
And a hammer 9 provided on an upper portion of a bracket 8 connecting between the movable booms 7.

The hammer 9 is equipped with a large number of crushing bits (not shown) at the tip of the head, and each bit violently vibrates by the air pressure to strike the tunnel wall surface, thereby dropping the tunnel wall surface along the shape of the bit.

A pair of fan-shaped frames 10 for swivel guides of the fixed booms 6 are fixedly arranged in front of and behind the frame 4.

A plurality of sprockets 11 are arranged along the turning trajectory on the inside of each frame 10 and on the gantry 4.
A roller chain 12 whose one end is connected to each of the fixed booms 6 is suspended in an endless state at 11.

One sprocket 11a located on the pedestal 4 is interlocked with the hydraulic motor 14, and the reciprocating rotational drive of the hydraulic motor 14 causes the booms 6 and 7 and the hammer 9 to be in the range of 25 to 155 ° along the wall surface of the tunnel pit 1. Turn back and forth.

A bracket 15 for connecting the two is provided between the fixed booms 6, and a cylinder portion 16 of a hydraulic jack 16 is fixed to the center of the bracket 15. The tip of the blanker 16b has a bracket for supporting the hammer. It is connected to the lower end of 8.

Further, a sensor 17 for detecting rotational displacement is arranged on the other sprocket 11b located on the gantry 4, and the turning angle position of the booms 6, 7 is detected by the detection output of this sensor 17. .

As shown in FIG. 3, the hydraulic motor 14 and the hydraulic jack 16 are controlled in rotation and expansion / contraction via a hydraulic drive circuit 19 by a control signal from a control board 18 according to the detection output of the sensor 17.

The control panel 18 has a built-in CPU and the like, and the vertical component force corresponding to the weight and angle of the hammer 9 is stored in advance.
The lower limit or the upper limit of the turning range is determined by the detection output of the sensor 17, and the hydraulic motor 14 is instructed to rotate, stop, or reverse the rotation.

Further, the hydraulic pressure of the hydraulic jack 16 is changed from the stored set value of the vertical component force and the detected turning angle position.

That is, when the position of the hammer 9 is in the vertical state, the vertical component force is maximum, and in order to cancel this, the pressing force of the hydraulic jack 16 is output to the hydraulic drive circuit 19 in order to maximize the pressing force. A command signal is output to gradually increase and decrease accordingly.

FIG. 4 shows a flowchart thereof. When the operation is started, first, in step 2, the turning angle θ of the booms 6, 7 is detected by the sensor 17.

In the following step 3, the pressure of the jack 16 required to press the bit of the hammer 9 against the tunnel wall surface with a constant pressure is calculated.

The calculation content is, for example, if the optimum pressing pressure for pressing the bit of the hammer 9 against the tunnel wall surface is set to W1 and the gravity of the hammer 9 is set to W2, the pressure required for the jack 16 is W1 +
The pressure of the jack 16 determined by W2.Sinθ is determined according to the corresponding turning angle, and this set pressure is output to the hydraulic drive circuit 19.

In the following step 4, it is judged whether or not the actual pressure of the jack 16 is a set value with respect to the pressure of the jack 16 set in the above step 3, and if the actual pressure is larger than the set value, the hydraulic pressure is set. The valve opening of the electromagnetic proportional relief valve in the drive circuit 19 is reduced to reduce the pressure of the hydraulic jack 16 (steps 5 and 6), and if the actual pressure is small, the valve opening is increased (step 7). ), The hydraulic jack 16 is extended or contracted by repeating such an operation, and when the actual jack pressure reaches the set value, the valve opening is kept in that state in step 8 and the work of slinging the tunnel wall surface is performed. .

Then, when the chipping work at that location is completed, the boom
When 6 and 7 are turned, the process returns to step 2 again, the next angle detection is performed, and the pressure setting of the jack 16 corresponding to the new turning angle is performed through the same steps 3 to 8 as described above. The actual jack pressure is controlled so as to match this set pressure.

<< Effects of the Invention >> As described in detail above with reference to the embodiments, the present invention provides the following effects in the device for hanging a tunnel wall surface.

Since the boom is rotated along the arch shape of the tunnel wall and the hammer is attached to the tip of the tunnel, the work is simple and repeated. Efficiency improves.

In addition, the pressing force of the boom is changed according to the turning angle of the boom so that the gravity applied to the hammer is equivalent to the vertical component force.
Since the strength of the bit's lifting force due to the vertical component force of the hammer, which changes according to the turning angle, is offset, a constant amount of lifting can be achieved at each part of the tunnel wall surface, and accurate work can be performed.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a state in which the harvesting device according to the present invention is arranged in a tunnel pit, and FIG. 2 is II-II in FIG.
FIG. 3 is an explanatory view showing the control mechanism, and FIG. 4 is a flowchart of the control mechanism. 1 …… Tunnel shaft 2 …… Running rail 4 …… Stand 5 …… Axis 6,7 …… Boom (6 …… Fixed boom, 7 …… Movable boom) 9 …… Hammer 11 …… Sprocket 12 …… Roller chain 14 …… Hydraulic motor (turning drive mechanism) 16 …… Hydraulic jack 17 …… Sensor (turning angle position detection means) 18 …… Control panel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 61-229066 (JP, A) JP 62-280496 (JP, A) JP 63-116597 (JP, U)

Claims (1)

[Claims] 1. A gantry installed so as to be able to travel inside a tunnel, a boom rotatably and extensible according to the sectional shape of the tunnel wall on the gantry, and a boom provided at the tip of the boom. A hammer with a bit for hanging,
A swing drive device for the boom and a telescopic jack, a detection unit for detecting the swing angle of the boom, and a vertical component of gravity applied to the hammer according to the angle of the boom detected by the detection unit is calculated, Based on this, there is provided a control device for controlling the jack so that the pressing force of the bit against the tunnel wall surface is always constant.