JPS6335768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous trench excavator for constructing a water-blocking wall or the like in the ground.

Conventionally, in such excavators, a plurality of rods having a bit at the lower end are arranged side by side on a frame body so that they can move up and down as well as rotate, and the rods are rotated by an appropriate drive mechanism and the rods are rotated. A drill is used in which the upper end surface is struck by a striking device and a slot is drilled with the tip of the bit, but if more rods are added as the slot is drilled, the length of the rod becomes large. As a result, it becomes difficult to transmit the impact force from the impact device to the bit, and as a result, the excavation capacity is significantly reduced, the overall weight increases, the suspension device becomes larger, and it becomes difficult to control the excavation direction. There was a problem that there was no.

Furthermore, if there are gaps between adjacent bits, it goes without saying that smooth excavation cannot be performed, and even if part of the outer periphery of the bits is arranged so that they overlap when viewed from the bottom side, it will not be possible to excavate smoothly. This method has problems such as difficulty in constructing a continuous wall with a constant thickness because only a groove with a cross-sectional shape in which the holes partially overlap can be obtained.

In order to eliminate such problems, the present invention has the following features:
A plurality of hammers each incorporating a mechanism for moving up and down a rod having a bit at its lower end with an impact are arranged in parallel in a sealed casing with the bits protruding downward, and this sealed casing is supported. An oscillating continuous trench excavator characterized by being connected to a member so as to be swingable from side to side using jacks or the like, and excavating while moving the sealed casing downward with the supporting member suspended by a stem. It provides an opportunity for

Embodiments of the present invention will be described with reference to the drawings.
is a drill unit in which a plurality of down-the-hole hammers 3 (two in the figure, but more may be used) are housed in a rectangular box-shaped sealed casing 2.
3 are arranged and housed in parallel in the horizontal direction.

The down-the-hole hammer 3 has a rod 5 disposed in the lower part of the cylinder 4 so as to be movable up and down by means of a spline 11, and the lower end of the rod 5 protruding downward from the cylinder 4 is connected to the width of the sealed casing 2 (parallel of the hammer). A bit 6 having approximately the same diameter as the width (in the direction perpendicular to the direction) is integrally provided, and the piston 7 at the upper end of the rod is moved up and down impulsively by pressure fluid supplied from a hydraulic hose or an air hose 8. It is structured as follows.

These hammers 3 are rotatably supported only in the circumferential direction by bearings 9 within the sealed casing 2, and a gear 10 is fixed to the upper end of the cylinder 4, and is arranged and fixed at an appropriate position within the sealed casing 2. The pinion 13 fixed to the rotating shaft of the hydraulic motor 12 is engaged with the gear 10 to generate the hammer 3,
3 is made to rotate.

Reference numeral 14 denotes a bracket that is integrally provided on the upper end surface of the sealed casing 2, and its center portion is rotatably pivoted by a pin 16 to the center portion of a support member 15 that is slightly wider than the sealed casing 2. be. Hollow stems 17 and 18 are provided on both sides of the upper end surface of this support member 15.
The lower end of the sealed casing 2 is fixed and the sealed casing 2 is suspended by these hollow stems via a support member 15. Further, the pressure fluid supply hose 8 such as the above-mentioned hydraulic hose is connected to the cylinder 4 of each hammer 3 via a universal joint 19, and is passed through one hollow stem 17 to a hydraulic pump, compressor, etc. disposed on the ground. It is connected to the drive source 21 of.

Reference numeral 20 denotes a mud draining pipe inserted into the other hollow stem 18, and its lower end spout 20a is opened downward from the support member 15.

Note that the hydraulic hose of the hydraulic motor 12 is also connected to the drive source using the inside of the hollow stem 17 in the same manner as described above.

Reference numeral 22 denotes a reciprocating jack which is pivotally connected by a pin 24 to a long hole 23 bored in the upper end of the bracket of the sealed casing 2. Both ends of the reciprocating rod 25 are connected to the stems 17 and 18. rod 2
The reciprocating movement of 5 causes the sealed casing 2 to swing left and right about the pivot pin 16 of the support member 15.

Reference numeral 26 denotes a direction correction plate attached to the front and rear surfaces of the support member 15 and the sealed casing 2, which is brought into contact with the inner wall surface of the slot 27 to be excavated.

In order to excavate a continuous trench with the excavator configured as described above, as shown in FIG. It is suspended by a vertical fixed frame 29. A movable platform 30 is attached to this frame 29 so that it can move up and down by driving a chain that spans a sprocket.
The upper ends of the stems 17 and 18 are detachably fixed to this movable table 30.

Now, the movable cart device 28 is moved to a predetermined position on the ground 31 such as bedrock, and the slot 27 is excavated to a desired depth using an excavator while gradually lowering the stems 17 and 18.

After drilling the first slot 27,
A guide pile 32 is built on the inner wall surface of one side, and members 33 and 34 protruding from the lower ends of the stems 17 and 18 are brought into sliding contact with the guide pile 32 and the inner wall surface of one side of the slot being excavated. While stem 17,
18 is moved down to perform excavation with bits 6 and 6. Note that the members 33 and 34 are also provided at the upper part of the member.

The slot 27 is excavated in muddy water 35, and the guide pile 32 prevents slime from entering the already excavated slot 27 from the slot 27 side that is being excavated, and improves the excavation accuracy.

To excavate the ground 31, the gear 10 is rotated to rotate the rod 5 together with the cylinder 4, and fluid pressure is supplied into the cylinder 4 to cause the rod 5 to move up and down with an impact, and by the bit 6. The excavated earth, sand and gravel are discharged from the spout 20a to the ground through the mud drain pipe 20 along with muddy water, and when the slot 27 of a certain depth is excavated, the joint between the hollow stems 17 and 18 is removed. Add to the depth and excavate to the desired depth.

Furthermore, when excavating the slot 27, the ground between the bits 6 and 6 can be removed by operating the reciprocating jack 22 and turning the rods 5 and 5 disposed in the sealed casing 2 to the left or right. The remaining portion excavated by the bit 6 is scraped off, and the excavation is continued so that the opposing inner wall surfaces 35 and 36 in the length direction become straight planes as shown in FIG.

The slot 27 excavated in this way is repeatedly excavated into the adjacent ground so as to be continuous in the length direction, thereby providing a continuous groove 37 of a desired length.

In the above embodiment, the rods 5 of the hammers 3, 3 are arranged vertically in the sealed casing 2, but as shown in FIG.
The bracket 14 may be arranged on the left and right sides of the pivot pin 16 of the bracket 14 for the bracket 5 in the radial direction. Even when the rod 5 is moved downward, it always operates in a direction perpendicular to the excavation surface 38, and no unreasonable force is applied to the rod 5.

As described above, in the present invention, the upper end of the sealed casing is pivotally connected to the supporting member, and the sealed casing is connected to the supporting member so as to be swingable from side to side by means such as a reciprocating jack, and within this sealed casing, A state in which a plurality of hammers are arranged in parallel in the swinging direction, and the rods having bits at the lower ends are moved up and down with an impact to strike and rotate to excavate, and their bits protrude downward. Since it is arranged in such a way that even hard ground such as rock can be reliably excavated by the impact of the bit, the sealed casing can be swung from side to side to completely remove the ground between the bits and the portion left unexcavated by the bit. Moreover, since multiple hammers with bits are arranged in parallel in the swinging direction, it is possible to efficiently excavate the ground of a desired width with a small swinging angle of the closed casing. Since it can be made small, it is possible to increase the impact force of the bit against the excavation surface in the vertical direction, thereby improving the excavation speed.

Furthermore, the lower ends of a stem consisting of two hollow pipes supported vertically movably by a movable cart device such as a crawler mount are fixed to both ends of the support member, a sealed casing is suspended, and the stem is attached to a guide pile or the like. Since the bit is moved up and down along the same axis, the whole is rigidly connected, and by regulating the stem on the other side, the vertical accuracy of excavation can be improved, and the impact reaction force from the bit is absorbed by the support member. While firmly receiving the stem through the
It is possible to excavate a highly accurate continuous groove of a constant width to a desired depth.

In addition, since the plurality of hammers are arranged in a sealed casing, they do not come into contact with muddy water for drilling, and therefore, the hammer striking mechanism and rotation mechanism can be operated smoothly without failure. can.

Furthermore, since one of the hollow pipes is used as a sludge draining pipe, and its lower end passes through the support member and opens downward, there is no need to use a separate sludge draining pipe, simplifying the structure. During excavation, it can move up and down together with the support member to smoothly drain mud at a predetermined position.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially sectional front view, Fig. 2 is a front view showing the excavation state, Fig. 3 is a simplified side view, and Fig. 4 is a trench. A plan view of the hole, and FIG. 5 is a partially cutaway front view showing another embodiment of the present invention. 2... Sealed casing, 3... Hammer, 5...
...rod, 6...bit, 12...stem, 14
... Bracket, 15 ... Support member, 17, 18
... Stem, 22 ... Reciprocating jack, 28 ...
Mobile trolley device.

Claims (1)

[Claims] 1. The upper end of the sealed casing is pivotally connected to the supporting member, and the sealed casing is connected to the supporting member so as to be swingable from side to side by means such as a reciprocating jack, and a rod having a bit at the lower end is installed in the sealed casing. A plurality of hammers are arranged in parallel in the swinging direction, and are arranged in a state in which the hammers are moved up and down with an impact to perform impact and are rotated to perform excavation, with their bits protruding downward. A closed casing is hung by fixing the lower ends of the stem, which consists of two hollow pipes that are vertically movably supported by a moving cart device such as a crawler mount, at both ends of the member, and the stem is moved vertically along a guide pile, etc. The swing type continuous trench excavator is characterized in that one of the hollow pipes is used as a mud removal pipe, and the lower end thereof penetrates the support member and opens downward.