JPH0260838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an excavator for burying pipes such as water pipes.

(Prior Art) Conventionally, there are the following methods for burying water pipes, drainage pipes, etc. underground.

That is, a screw rod having a cutting cutter at its tip and a spiral conveying blade on its outer periphery that is driven and rotates, an inner pipe that fits around the outer periphery of the rod, and an outer pipe as a buried pipe that surrounds this inner pipe. The soil and gravel excavated by the excavation cutter are carried out through the inner pipe by the transport blade,
Every time the screw rod and the inner and outer tubes advance a predetermined length, new rods and inner and outer tubes are added and sent underground, and the outer tube is buried.

(Problems to be Solved by the Invention) By the way, the geological strata at the site where the pipe is buried are hardly uniform, and often include rock or gravel layers.

When excavating such rock or gravel layers, the excavation cutter runs away in various directions and its direction is not determined, making it almost impossible to excavate straight.

However, if the outer pipe is propelled with the above-mentioned bend in the excavation, the direction of its propulsion will be distorted and the propulsion resistance will increase significantly, leading to a decrease in work efficiency and unnecessary external pressure being applied to the buried outer pipe. Otherwise, problems may arise in the strength of the outer tube.

Furthermore, there is a risk that not only the outer pipe will not reach the fixed point, but also that other buried objects may be damaged and an unexpected accident may occur.

The purpose of the present invention is to ensure the straightness of the outer pipe and to prevent bending in the case of bending during excavation.
To provide a pipe burying excavator which can easily correct the deviation in the direction of propulsion of the outer pipe and bury the outer pipe straight.

(Means for Solving the Problems) The excavator for burying pipes of the present invention has an excavator main body slidably and fixedly installed on a horizontally arranged guide frame, and the excavator main body An inner tube and an outer tube surrounding the inner tube are made to protrude, a cutting cutter is provided at the tip of the inner tube, a spiral conveying blade is provided on the outer periphery of the tube, and a spline is provided on the outer periphery of the rear end of the tube. The outer tube is connected to a hollow sliding shaft which is rotatable and slidable in the axial direction of the inner tube, and is provided with means for rotating the outer tube in the circumferential direction, and the distal end of the outer tube is warped at an appropriate length, The tip of the inner tube is connected to the succeeding portion via a universal joint so as to rotate along the warp of the tip of the outer tube, and a light emitting body is installed on the axis in the inner tube immediately after the joint. A viewing mirror is provided on the rear outside of the inner tube located on the same axis as the light emitting body, for observing deviations in the direction of propulsion of the outer tube while observing the deviation of the light emitting body from the center point. .

(Example) An example of implementing the present invention will be described with reference to the drawings. In the drawing, 1 is an excavator main body, and 2 is a guide frame that guides the main body 1.

The guide frame 2 is an elongated frame installed horizontally, and rails 3 and 3 are provided on both longitudinal edges thereof.
3, and the excavator main body 1 is slidably mounted on the rails 3, 3, and stationary pin holes 29 are provided at predetermined intervals in each of the rails 3, 3.
Fit the stationary pins 28, 28 to the excavator body 1.
to be able to be fixed.

An outer tube support frame 20 is fixed to one end of the rails 3, 3, and a cylinder rod fixing base 21 is slidably and fixedly mounted on the other end.

The fixing base 21 is connected to the rods of the hydraulic cylinders 11, 11 provided on both sides of the excavator main body 1, and with the fixing base 21 fixed to the rail 3 of the guide machine frame 2 with a fixed pin 28, the hydraulic cylinder 11
By extending the excavator body 1, the excavator main body 1 is moved by a predetermined amount.

Then, when the hydraulic cylinder 11 is fully extended, the stationary pin 28 is removed and the cylinder 11 is contracted, thereby drawing the cylinder rod fixing base 21 toward the excavator main body 1 side.

In this state, if the cylinder rod fixing base 21 is fixed with the stationary pin 28 and the hydraulic cylinder 11 is extended, the excavator main body 1 can be moved again.

The excavator main body 1 forms a receiving surface 22 on the front surface in the direction of movement so that the outer tube 6 is fitted therein. A partition plate 10 is provided between the receiving surface 22 and the rear surface 23 of the excavator main body 1.
is provided to form a sediment discharge chamber 30, and a discharge hole 12 is provided in the bottom surface of the chamber. The above-mentioned partition plate 10 and rear surface 23
supports the rotating cylinder 13 rotatably, and also links the rotating cylinder 13 with a driving machine 14 provided at the upper part of the excavator main body 1.

A spline is formed on the inner surface of the rotating cylinder 13, and is fitted with a spline formed on the outer periphery of the sliding shaft 15.

The sliding shaft 15 is a hollow shaft having a spline formed on its outer periphery, and its rear end is rotatably attached to the sliding movable piece 17, and the inner tube 5 is fixed to the front thereof.

The movable piece 17 has rods 32' of a hydraulic cylinder 32 connected to its left and right ends, and the expansion and contraction of the rods 32' causes the inner tube 5 to slide inside the outer tube 6 via the movable piece 17 and the sliding shaft 15. make it move.

Next, the outer tube 6 will be explained. First, the rear end is supported by the receiving surface 22, and the distal end thereof is slidably supported by a support ring 24 provided in the outer tube support frame 20.

The support ring 24 is opened and closed by an opening/closing cylinder 25, and is open when the outer tube 6 is propelled.

Further, while the support ring 24 is closed by the opening/closing cylinder 25, the outer tube 6 can be opened by operating the deflection cylinders 26, 26 provided on both sides of the support ring 24.
It is designed to rotate in the circumferential direction.

A length section beyond the portion supported by the support ring 24 at the distal end of the outer tube 6 is bent by a small angle via a bent portion 6'.

The means for forming this warp is not limited to the above-mentioned bending, and the distal end portion of the outer tube 6 may be curved with a large curvature.

Next, regarding the inner tube 5, the inner tube 5 is provided with an excavation cutter 4 at its tip, and is provided with a spiral conveying blade 5' on its outer periphery, which is fitted into the outer tube 6 and is connected to the driver 14. It is driven and rotated by the power transmitted from the rotating cylinder 13 and the sliding shaft 15, and is slidable in the axial direction by the hydraulic cylinders 32, 32.

The distal end of the inner tube 5 is constituted by a distal end member 4' separate from the trailing part, and the member 4' is connected to the trailing part by a universal joint 7.
The joint 7 and the bent portion 6' of the outer tube 6 are aligned so that the tip member 4' rotates along the warp of the tip of the outer tube 6.

The conveying blade 5' conveys the earth and gravel excavated by the excavation cutter 4 through the outer pipe 6, and transfers it to the discharge chamber 30.
and is discharged through the discharge hole 12.

Further, a light emitting body 8 is installed on the axis in the inner tube 5 immediately after the joint 7, and a light emitting body 8 is installed on the rear outside of the inner tube 5 located on the same axis as the light emitting body 8. A viewing mirror 9 is provided to monitor the deviation from the center point.

Next, the outer pipe 6 is carried out using the excavator of the above embodiment.
The burying work will be explained with reference to FIGS. 4 to 8.

First, the excavator main body 1 is moved by the hydraulic cylinders 11, 11 while rotating the inner tube 5 and the excavation cutter 4, and the inner tube 5 and the outer tube 6 are propelled to start excavation from the prepared state shown in FIG. 4. .

In the excavation work, the inner pipe 5 is rotated by the drive machine 14 and moved forward by the hydraulic cylinder 32, and the cutter 4 is moved in advance of the outer pipe 6 to excavate, and then the cutter 4 is excavated by the cylinder 11 while maintaining the leading state and rotating. Move the machine body 1 forward and remove the inner tube 5.
and propels the outer tube 6 (FIG. 5).

Due to the preceding work of the cutter 4, by excavating and removing a large amount of earth and gravel from the front of the outer pipe 6, the surrounding natural ground loses its compactness and the reaction force against the warped part of the outer pipe 6 is reduced. becomes smaller.

In addition, although the outer pipe 6 has a slight warp at its tip, it is a rigid body as a whole, and its base is compacted with surrounding earth and sand, so the reaction force exerted on the warped surface of the pipe and the reaction force of the natural ground are When balanced, the outer tube 6 moves straight.
The bending tendency of the curved surface of the outer tube 6, which is a rigid body, is due to the strength of the reaction force of the ground.In order to balance these two forces and make the outer tube move straight, the excavation cutter 4 is moved ahead of the outer tube 6. let However, even with such a mechanism, uneven ground cannot be predicted and bends often occur.

This bending of the outer tube 6 in the propulsion direction is confirmed by the viewing mirror 9 as a deviation from the center point of the light emitter 8.

For example, when the light emitter 8 shows a tendency to shift upward, first the inner tube 5 is moved back using the hydraulic cylinder 32 or the outer tube 6 is advanced using the cylinder 11 to bring the cutter 4 and the tip of the outer tube 6 closer together. (FIG. 6), then the support ring 24 is closed by the opening/closing cylinder 25, and then the deflection cylinder 26 is closed.
is operated to rotate the outer tube 6, and the tip of the outer tube 6 is bent downward as shown in FIG.

After the tip of the outer tube 6 is bent downward, the cutter 4 and the tip of the outer tube 6 are excavated and propelled in close proximity to each other, thereby correcting the direction of propulsion of the outer tube 6 to a predetermined direction (FIG. 8). After the adjustment of the outer tube 6 is completed, the cutter 4 is moved forward again by the cylinder 32 and excavation is propelled in the same state as shown in FIG.

In this way, each time the outer tube 6 bends, the cutter 4 and the tip of the outer tube 6 are brought close to each other, and the outer tube 6 is rotated so that its tip faces in the opposite direction to the bending direction, thereby changing the direction of propulsion of the outer tube 6. The outer pipe 6 is sent into the ground and buried while being corrected in a predetermined direction.

After one inner pipe 5 and one outer pipe 6 are sent into the ground for a predetermined length, the excavator main body 1 and cylinder rod fixing base 21 are moved back, and the inner and outer pipes 5 and 6 are added, respectively, and the above-mentioned work is carried out. repeat.

As described above, the present invention is such that the distal end of the outer tube is warped over an appropriate length section, and the distal end is given a directionality different from that of the subsequent portion.

In other words, when excavating rock or gravel layers, it is almost impossible to eliminate bends in the excavation, and bends constantly occur in one direction or the other. If it is allowed to occur, the bend in the excavation and the accompanying deviation in the direction of propulsion of the outer tube can be easily corrected, and the outer tube can be buried straight.

In addition, since the rear end of the inner tube is connected to a sliding shaft that is rotatable and slidable in the axial direction, the inner tube can be rotated forward and excavated using the cutter at the tip of the inner tube in advance of the outer tube. By propelling the outer tube through the hole, the external pressure applied to the outer tube can be minimized, and the straightness of the outer tube can be ensured.

Therefore, unnecessary external pressure does not remain in the buried outer tube, and there is no risk that the outer tube will reach a fixed point and damage other buried objects, which is safe.

Thus, the intended purpose can be achieved.

[Brief explanation of drawings]

Fig. 1 is a sectional front view showing the excavator of the present invention, Fig. 2 is a cross-sectional front view showing the excavator of the present invention;
The figure is a plan view of the same, FIG. 3 is a left side view of the same, and FIGS. 4 to 8 are partially cutaway front views showing the process of burying the pipe. In the figure, 1... excavator body, 2... guide machine frame,
3...Rail, 4...Drilling cutter, 4'...Inner pipe tip member, 5...Inner pipe, 5'...Transporting blade, 6
...Outer tube, 6'...Bent part, 7...Universal joint, 8
...Light emitter, 9...Visual scope, 15...Sliding shaft, 2
0... Outer tube support frame, 24... Support ring, 25... Opening/closing cylinder, 26... Deflection cylinder.

Claims (1)

[Claims] 1. The excavator body is slidably and fixedly installed on a horizontally arranged guiding machine frame, and an inner pipe and an outer pipe surrounding the inner pipe are protruded from the excavator main body, and the inner pipe is A drilling cutter is provided at the tip, a spiral conveying blade is provided on the outer periphery of the tube, and the rear end of the tube is a hollow sliding shaft with splines on the outer periphery that is rotatable and slidable in the axial direction of the inner tube. and a means for rotating the outer tube in the circumferential direction is provided, and the distal end of the outer tube is warped at an appropriate length section, and the distal end of the inner tube is connected to a trailing portion such that the distal end of the inner tube rotates along the warp of the distal end of the outer tube. A light emitting body is installed on the axis in the inner tube immediately after the said joint, and a light emitting element is installed on the rear outside of the inner tube located on the same axis as this light emitting body, from the center point. An excavator for burying pipes equipped with a viewing mirror that visually detects deviations in the direction of propulsion of the outer pipe while observing the deviation of the light emitter.