JPS59199997A - Vibration type control embedding apparatus - 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 The present invention relates to a device for burying pipes, and particularly to a vibratory management installation device for burying small-diameter pipes.

Currently, in order to bury small-diameter pipes such as sewer pipes and electrical conduit pipes, the propulsion method has become mainstream instead of the conventional cut-and-cover method.

This propulsion method involves a consolidation method in which a volume of soil corresponding to the cross-sectional area of the buried pipe is compressed and removed around the buried pipe, and a consolidation method in which a volume of soil corresponding to the cross-sectional area of the buried pipe is removed using an auger. There is an auger method for excavating and draining. However, the consolidation method, which is used especially when the ground is soft, requires a large force as a propulsion force, and since a large force acts on the buried pipe, it is difficult to prevent the buried pipe from breaking. Moreover, it has the disadvantage that the buried pipe may shift from the position where it should be buried, resulting in poor directional accuracy. The auger method has the disadvantage that it is necessary to add an auger each time a subsequent buried pipe is added, and the work is complicated.

Therefore, five vibration methods have been proposed that improve the above-mentioned drawbacks. This vibration method vibrates the top of the buried pipe, vibrates the surrounding soil, and disturbs the arrangement of soil particles, thereby reducing propulsion resistance and enabling highly efficient propulsion. It is.

A device for burying pipes using such vibration method (Japanese Patent Application 1983-
7256) will be explained with reference to FIGS. 1 to 4.

This vibration-type management installation device is provided with a vibrating excavation means, a so-called excavation head 2, at the head of a buried pipe 3, and a main push cylinder 5 as a propulsion means in a starting shaft 4 provided in ±1.
is arranged, and this original push cylinder 5 is brought into contact with the rear part of the buried pipe 3. The digging hend 2 has a conical head;
The eccentric shaft is supported in the excavation hend 2, which has a tubular body whose outer diameter is almost the same as the outer diameter of the buried pipe 3.

This eccentric shaft includes a shaft part 7 supported in the axial direction of the digging hend 2 via a bearing (not shown), and a semicircular eccentric weight 6 integrally fixed to the shaft part 7. Karanashi,
The shaft portion 7 is linked to an electric motor (not shown).

Next, the operation of this vibrating management installation device will be explained.

First, the electric motor is driven and the main push cylinder 5 is extended. Then, the eccentric shaft rotates in the direction of the arrow in FIG.
The central axis of rotates in the direction of the arrow. In other words, the excavation hend 2 vibrates around its axis in a direction perpendicular to the axis (hereinafter referred to as
It is simply called @photography. )I do. As shown in Fig. 3, this lateral vibration of the excavation head 2 gives disturbance (vibration) to the surrounding ±1 in the direction of the arrow, and disturbs the natural structure (arrangement of soil particles) of the surrounding ±1. However, the intensity can be reduced by ±1. In this way, the soil surrounding the buried pipe 3 is softened, so it can be propelled with a small thrust. As the excavation progresses, the buried pipes 3 are successively added from the rear (starting shaft; □ advance shaft 4) side, and transmit the thrust of the main push cylinder 5 to the excavation head.

In addition to the lateral vibration of the excavation head 2, the above-mentioned vibrating control equipment also uses liquid from the tip of the excavation head 2 depending on the soil quality of the ground (for example, bentonite solution for sandy soil or a liquid for clay soil). ±1 by supplying water.
It is possible to reduce the strength even more.

However, since the above-mentioned conventional vibrating control equipment utilizes the lateral vibration of the excavation hend 2, the ground vibration in the surrounding area, especially the ground vibration appearing on the ground surface, is large.
There is a problem. For example, as shown in FIGS. 3 and 4, when ±1 around the excavation head 2 is subjected to lateral vibration in the direction of the arrow of the excavation head 2, ±1 is partially subjected to compressive force, and the soil l needs to undergo local compressive deformation, that is, a volume change in which the volume tends to shrink. However, ±1 is difficult to compress and deform (the volume of ±1 is difficult to shrink).

Therefore, there is a problem in that the effects of compressive deformation are transmitted over long distances, resulting in large ground vibrations appearing on the ground surface.

The present invention aims to provide a vibrating management installation device that solves the above-mentioned problems.

The present invention is characterized in that the vibration direction of the vibration excavation means is torsional vibration around the axis of the buried pipe.

That is, by torsionally vibrating the vibrating excavation means,
The soil surrounding the vibratory excavation means is not compacted, but only dragged by shear. This shear deformation of the soil can disturb the soil structure and reduce the resistance of the soil.On the other hand, since the soil does not require local volume changes due to compressive deformation, torsional vibrations are attenuated over short distances. Therefore, ground vibrations appearing on the ground surface can be reduced.

Hereinafter, two examples of the embodiments of the vibrating management installation device of the present invention will be described with reference to FIGS. 5 to 9.

5 to 8 show a first embodiment of the vibrating management installation device of the present invention, FIG. 5 is a side view, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5, and FIG. (a) to (d) are explanatory diagrams of the operation of the eccentric shaft, and FIG. 8 is an explanatory diagram showing the state of vibration transmission.

In the figure, the same reference numerals as in FIGS. 1 to 4 indicate the same parts.

Therefore, the vibrating management installation device of the present invention in this embodiment has two eccentric shafts supported in the axial direction of the excavation head 2 in the front end of the excavation head 2, and these two eccentric shafts are connected to a gear device. (not shown) to an electric motor. These two eccentric shafts are the shaft portion 7a.

7b and the eccentric weights 6a + 6b are rotated in the same direction by a gear mechanism while maintaining a phase difference of j: 1180°.

The vibrating management equipment of the present invention in this embodiment has the above-described configuration, and its operation will be described below.

The electric motor is driven and the main push cylinder 5 is extended. Then, the two eccentric shafts are
), the direction of the arrow (
clockwise) and generates centrifugal force F.

The centrifugal force F due to the rotation of the eccentric weights 6a and 6b is expressed by the following formula. That is, F = -rω2 However, W is the weight r of the eccentric masses 6a, 6b, and the eccentricity ω of the eccentric masses 6a, 6b is the rotational angular velocity of the eccentric masses 6a, 6b? is the gravitational acceleration.As a result, when the two eccentric shafts are in the state shown in Figure 7(a), the centrifugal forces F of the eccentric weights 6 (L, 5b) are directed outward in opposite directions and cancel each other out. When the two eccentric shafts are in the state shown in Figure 7(b), the centrifugal force F constitutes a clockwise couple, and if the distance between the eccentric masses is D, then
The moment T is expressed by the following formula. That is, T=F - D This couple rotates the excavation head 2 clockwise.

Furthermore, when the two eccentric shafts are in the state shown in FIG. 7(C), the centrifugal forces F of the eccentric weights 6a and 6b are directed inwardly in opposite directions and cancel each other out. When the two eccentric shafts are in the state shown in Fig. 2(d), a counterclockwise couple is formed, and this couple causes the excavation head 2
Rotate counterclockwise.

By rotating the excavation head 2 alternately clockwise and counterclockwise in this way, the excavation head 2 causes a torsional movement and applies an oscillatory shearing force to the surrounding area of ±1, The resistance force of ±1 can be lowered by disturbing the ±1 tissue, and the buried pipe 3 can be propelled along with the expansion of the original push cylinder 5.

At this time, ±1 of the circumference of the excavation head 2 is simply dragged by shearing without being compressed, as shown in FIG. As a result, since ±1 does not require a local volume change due to compressive deformation, the torsional vibration of the excavation hect 2 is attenuated over a short distance and is transmitted only to the very vicinity of the excavation head 2, so that it is not exposed to the ground surface. It is possible to reduce ground vibration caused by vibration compared to conventional vibrating control equipment.

FIG. 9 is a sectional view showing a second embodiment of the vibrating management and installation device of the present invention. In this example, the shaft portion 7''
+ 7 b * 7 c + 7 d and eccentric weight 5a
, 6b*6c, and 6d, that is, two pairs of eccentric shafts are used, and these four eccentric shafts are rotated in the same direction while maintaining a phase difference of 90°.

This embodiment can provide the same effects as those of the above-mentioned embodiments.

Incidentally, the vibrating management equipment of the present invention, as in the above-mentioned embodiment, has a pair of eccentric shafts 6a, 6b, two pairs of eccentric shafts 6a,
In addition to those using 6b, 6c, and 6d, three or more pairs of eccentric shafts may be used. Also, the 9th
In the figure, two pairs of eccentric shafts 6a l 6br 6c+6d
Although the phase difference to be maintained is 90°, it does not necessarily have to be 90°. That is, the vibrating management installation device of the present invention has the following features:
At least one set of eccentric shafts is supported as one set, and the eccentric shafts forming the pair of each set are 180
The shafts are rotated in the same direction while maintaining a phase difference of . Moreover, when there are two or more sets of eccentric shafts, each set of eccentric shafts is rotated so that the direction of the eccentric force of each set maintains an angle equal to the angle formed by each set of eccentric shafts.

FIG. 10 is an explanatory diagram showing a modification of the vibrating management and installation device of the present invention.

In this example, a vibration means 10 is provided in the starting shaft 4,
This vibration means is interposed between the rear part of the buried pipe 3 and the original push cylinder 5. This vibrating means 10 is a vibrating means that generates torsional vibration similar to the one in FIG. 6 or 9 explained in the above-mentioned embodiment. Convey to the tip of 3. For this purpose, all buried pipes 3 are connected to the circumference. Moreover, it is more convenient to use steel pipes. In this configuration in which the vibrating means is placed at the rear of the buried pipe rather than at the tip, the size of the vibrating means can be arbitrarily selected regardless of the diameter of the buried pipe, and the power line for driving the vibrating means can be selected as desired. Since there is no need to pass through
Suitable for burying small diameter pipes. Furthermore, there is an advantage that maintenance and inspection of the machine is easy.

As is clear from the above embodiments, the vibrating management installation device of the present invention vibrates the vibrating excavation means torsionally to disturb the structure of the surrounding soil by shearing, lowering the resistance force of the soil and causing damage to the soil. Since the buried pipe is propulsion-buried, the soil is not compressed but only dragged by shear, and therefore the soil does not require local volume changes due to compressive deformation. For this reason, the torsional vibration is attenuated in a short distance, and therefore, the effect of reducing the ground vibration appearing on the ground surface can be obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 to 4 show a conventional vibrating management equipment, where Figure 1 is a side view, Figure 2 is a cross-sectional view of the An explanatory diagram showing the transmission of vibration, Figure 4 is the third
It is a view in the direction of the ■ arrow in the figure. 5 to 8 show a first embodiment of the vibrating management installation device of the present invention, FIG. 5 is a side view, FIG. 6 is a sectional view taken along the line Vl-'Vl in FIG. 5, and FIG. Figures (a) to (d) are explanatory diagrams of the operation of the eccentric shaft, and Fig. 8 is an explanatory diagram showing the transmission of vibration. FIG. 9 is a sectional view showing a second embodiment of the vibrating management and installation device of the present invention. FIG. 10 is an explanatory diagram showing a modification of the vibrating management and installation device of the present invention. 1...Soil, 2...Drilling hend (vibratory digging means), 3
... Buried pipe, 4... Starting shaft, 5... Main push cylinder (propulsion means), 6a, 6b, 6c,
6d -=eccentric weight, 7a, 7b, 7c
, 7d---Shaft part. Figure 1 H 2nd cause Figure 3 / Figure 4 Figure 5-W Figure 6 Figure 7 (G) (Bn (C) Figure 8 Figure 9

Claims (1)

[Claims] 1. Providing a vibration means for vibrating the buried pipe in the buried pipe, providing a propulsion means for propelling the buried pipe in the starting shaft, vibrating the buried pipe by the vibration means, and , in a vibrating management installation device that propels and buries a buried pipe by applying propulsive force from the rear of the buried pipe using a propulsion means, the direction of vibration of the vibratory excavation means is determined by the torsion of the axial center of the buried pipe. A vibrating management equipment characterized by vibration. 2. The vibrating management and installation device according to claim 1, wherein the vibrating means is provided at the top of the buried pipe. 3. The vibrating management installation device according to claim 1, wherein the vibrating means is provided within the starting shaft. 4. The vibration means supports at least one set of eccentric shafts, and rotates the eccentric shafts of each set in the same direction while maintaining a phase difference of 180°. A vibratory management and installation device according to claim 1, 2, or 3, characterized in that: