JPS6241071Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a widening excavator for excavating a foundation in an excavation trench for providing an underground continuous wall.

2. Description of the Related Art Conventionally, as this type of excavator, there has been known an excavator equipped with a wing expansion bit that expands the lower end of a cylindrical groove such as a stake to form a base.

However, this excavator is designed for cylindrical trenches and can only excavate small areas at a time, and must be used many times to excavate long trenches for continuous walls. Furthermore, since the expanded wing bit excavates the surrounding area at once, it is not suitable for cases where only one side needs to be excavated, such as long grooves for continuous walls. Furthermore, there is no known excavator dedicated to excavating long grooves for continuous walls.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to press the chain bit, which is driven in an endless track, against the other side wall with a jack that presses one side wall of the long groove for an underground continuous wall.
To provide a widening excavator for an underground continuous wall which can excavate a wide range at once by excavating the other side wall, and can excavate only one side wall of a long trench.

This invention will be explained below with reference to illustrated embodiments.

The widening excavator 1 includes two guide parts 2, 2, a chain bit 3 provided on the two guide parts 2, 2, a drive part 4 thereof, and a chain bit 3 provided on the two guide parts 2, 2.
It consists of a hydraulic jack 7 which can press the pipes against one side wall 6 of the long groove 5 for an underground continuous wall, and a mud draining pipe 8 which suspends and supports these in the long groove and discharges mud. (See FIGS. 1 and 2) The guide portion 2 is provided with grooves of two channel materials facing each other and parallel to each other.

The chain bit 3 is provided so that it can be driven in an endless track around a frame 9 provided perpendicularly to the guide parts 2, 2, and has an inclined part 3a at the upper part. The frame has a through hole 1 so as to be movable in the longitudinal direction of both guide parts 2, 2.
0 and 10 are provided.

The drive unit 4 includes submersible electric motors 11 and
11, and the output shaft 11 of this underwater electric motor 11, 11
The speed reducer 12 provided in a and the speed reducer 1
A gear 13 is provided on the output shaft 12a of the submersible electric motor 1 and transmits rotational force to the chain bit 3.
1 and 11, and a storage cover 15 that houses them. The storage cover 15 includes both guide portions 2,
It is provided on the frame 9 between the two and on the side from which the contact portion 7a of the hydraulic jack 7 protrudes.

The hydraulic jack 7 is provided on the same line on the outside of both guides 2, 2, and is spaced apart so that the chain bit 3 and the drive section 4 can be moved a predetermined distance so as to sandwich the chain bit 3 and the drive section 4. The hydraulic jack 7 is adapted to press the chain bit 3 against the other side wall 16 by pressing the contact portion 7a against one side wall 6 of the long groove 5.

The mud discharge pipe 8 is provided to penetrate the drive part 4 and the frame 9, and discharges the mud after the side wall excavation by the chain bit 3 to the outside of the long groove 5, and also suspends the widening excavator 1 inside the long groove 5. To support.

To widen the lower part of the long groove 5 using the widening excavator 1, first, the widening excavator 1 is suspended and inserted into the long groove 5 using the mud removal pipe 8.

Next, when the widening excavator 1 reaches the lower end of the long groove 5, the submersible electric motor 1 drives the chain bit 3. (See Fig. 3) Next, attach the contact portion 7a of the hydraulic jack 7 to one side wall 6.
to press the rotating chain bit 3 against the other side wall 16. At this time, the chain bit 3 is simultaneously moved along the guide portion 2 toward the lower end of the long groove 5. In this way, the long groove 5
becomes wider towards the lower end (chain bit 3
excavate the foundation part 17 (by the inclined part 3a).
(See Fig. 4) Next, after the excavation is completed, the contact part 7a of the hydraulic jack 7
Pull back and attach chain bit 3 to base part 17.
Remove from. Then, the widening excavator 1 is suspended outside the long groove 5. (See FIG. 5) By inverting the widening excavator 1, one side wall 6 can also be excavated as shown by the broken line in FIG.
Further, excavation can be performed not only at the lower end of the long groove 5 but also at an intermediate point.

This invention has the above configuration and has the following effects.

While driving a chain bit in the form of an endless track with a movable guide part, a hydraulic jack is used to press one side wall of the long groove, and the reaction force is used to press the chain bit against the other side wall to excavate and widen the other side wall.

Therefore, since excavation is performed using the pressing force of the side wall by the hydraulic jack, the excavator can be securely fixed and the side wall can be excavated reliably.

Since excavation is carried out using a chain bit, a wide range of long grooves can be excavated at once, and since the chain bit can move the guide section, the foundation section can be easily formed.

Since only one side wall is excavated in one excavation,
Can be excavated on one side and both sides as required.

Since the mud discharge pipe is also used to support the suspension of the excavator, there is no need for a separate wire for suspension support, and the mud after excavation can be reliably discharged.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the widening excavator of this invention inserted into a long trench, and Figure 2 is A-A in Figure 1.
Line sectional view, Figure 3 is a view taken along the line B-B in Figure 1, Figure 4 is a view taken along the line B-B in Figure 1 showing the state during excavation work, and Figure 5 is the completed excavation widening. FIG. 2 is a view taken along the line BB in FIG. 1 showing a later completed state of the foundation. DESCRIPTION OF SYMBOLS 1... Widening excavator, 2... Guide part, 3... Chain bit, 3a... Inclined part, 4... Drive part,
5... Long groove, 6... One side wall, 7... Hydraulic jack, 7a... Contact part, 8... Sludge removal pipe, 9... Frame, 10... Through hole, 11... Submersible electric motor, 11
a... Output shaft, 12... Reduction unit, 12a... Output shaft, 13... Gear, 14... Control unit, 15... Storage cover, 16... Other side wall, 17... Foundation.

Claims (1)

[Scope of utility model registration request] A guide part is provided in parallel on the same plane at a predetermined interval and inserted into a long groove for an underground continuous wall, and both guide parts are movable in the longitudinal direction, and an endless track runs around the vertical plane of both guide parts. a chain bit that is drivable in the form of a chain bit; a drive section that drives the chain bit; and a drive section that is attached to both guide sections so as to sandwich the chain bit and drive section at intervals that allow the chain bit and drive section to move a predetermined distance. and a jack part capable of pressing one side wall of the long groove for an underground continuous wall, and a mud drainage pipe that suspends and supports these in the long groove for an underground continuous wall and discharges mud after excavation. A widening excavator for underground continuous walls.