JP2000291054A - Apparatus for vertically drawing soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excavated soil from clogging the interior of a suction hose. SOLUTION: The apparatus for vertically drawing soil comprises a vacuum suction device 2 arranged on the ground, for sucking air in a hopper 4 by a blower 6, and a suction hose 10 connected to the hopper 4 and hung in an underground hole 1. The suction hose 10 is formed so as to be expandable in the longitudinal direction, and a plurality of longitudinal portions of the hose hung in the underground hole 1 are linked to a rope 18, whereby the hose is corrugated in the longitudinal direction. Thus, the hung portion of the suction hose 10 is smoothly expanded and contracted according to the change in negative pressure in the hose, which prevents adhesion of the excavated soil to the hose, to thereby prevent the excavated soil from clogging the interior of the hose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical excavating device for transporting excavated earth and sand to the ground when excavating an underground hole such as a deep foundation or a shaft.

[0002]

2. Description of the Related Art When excavating an underground hole, excavated sediment (sediment,
Various vertical excavating apparatuses for transporting rock crushed debris and pebbles to the ground have been proposed. For example, a first vertical unloading device that mixes excavated soil and water to make muddy water and conveys it to the ground by a muddy water pump. A second vertical unloading device that transports excavated earth and sand to the ground using a buckle that moves up and down with a crane or the like.

[0003] Since the above-mentioned first vertical unloading device requires a large amount of water, it cannot be used in places where water cannot be secured (mountain areas). Further, it is difficult to post-process the mud carried to the ground.

[0004] The second vertical excavating apparatus is dangerous because the excavated earth and sand may spill from the buckener when the buckler is lifted, and the excavated earth and sand may hit an operator who excavates the underground hole.

[0005] A vertical earth-lifting apparatus which solves the above problem is disclosed in Japanese Patent Application Laid-Open No. Hei 6-235225. This vertical lifting device has a vacuum suction device installed on the ground and a suction pipe. The vacuum suction device is shaped to suck air in a hopper by a blower, and the suction pipe is connected to the hopper. The suction pipe is hung down in the underground hole, and the excavated soil is sucked and conveyed into the hopper above the ground.

[0006]

When the viscous excavated earth and sand is conveyed by the above-described vertical excavating apparatus, the excavated earth and sand may adhere to and accumulate inside the suction pipe, causing clogging of the suction pipe. If the suction pipe becomes clogged, it will be necessary to suspend the transfer operation and remove the clogged excavated soil.
Poor transfer efficiency.

In the above-described vertical lifting apparatus, a rotating body is provided on the suction pipe, and by rotating this rotating body, the bent portion of the suction pipe is prevented from being clogged with excavated earth and sand. Is provided in the horizontal suction pipe portion, but not in the vertical suction pipe.

That is, in the above-described vertical lifting apparatus, the vertical suction pipe portion is not clogged with the excavated earth and sand. However, when the highly viscous excavated earth and sand is conveyed, the excavated earth and sand are filled in the vertical suction pipe portion. May be clogged.

In order to solve this problem, it is sufficient to provide a rotating body at the vertical suction pipe portion. However, in this case, the vertical suction pipe portion becomes an expensive auger pipe, so that a costly transfer device is required. Becomes In particular, when excavating a deep underground hole such as a deep foundation, the suction pipes are sequentially added, and the rotating body is also added, which makes the operation difficult.

The present inventors have conducted intensive studies and experiments on the above-described vertical lifting apparatus utilizing the vacuum suction force, and found that the negative pressure in the suction pipe is not constant but changes intermittently. In other words, the suction pipe does not continuously suck the excavated sediment, but presses the suction part of the suction pipe against the excavated sediment and sucks it. Pressed against. Therefore, the negative pressure in the suction pipe is large when the suction unit is pressed against the excavated earth and sand, and the negative pressure in the suction pipe is small when the suction unit is separated from the excavated earth and sand.

In view of the above, the present inventors have disclosed in
Attention has been paid to the hose that expands and contracts in the longitudinal direction at the time of normal pressure and at the time of negative pressure generation disclosed in Japanese Patent No. 252137, and the hose is used as a suction hose. The suction hose was expanded and contracted to remove the excavated earth and sand adhering to the inner surface to prevent clogging, but sufficient results were not obtained.

When the above-mentioned reason was examined, the following was found. Since the suction hose is hung down in the underground hole, an extension force by its own weight acts on the suction hose. When the negative pressure increases due to the extension force, the suction hose does not shrink sufficiently, so that the excavated earth and sand adhering to the inner surface cannot be reliably clogged without peeling off.

Further, when the above-mentioned suction hose is added to carry the excavated earth and sand in a deep underground hole, the excavated earth and sand adheres and accumulates at the joint of the suction hose, causing clogging. The reason is that one end of the splicing pipe is inserted into one suction hose, the other end of the splicing pipe is inserted into the other suction hose, and the suction hose is added. This was due to a step.

Since the vacuum suction device installed on the ground and the underground hole to be excavated are separated from each other, the aforementioned suction hose is laid on the ground and connected to the vacuum suction device. The excavated soil was clogged and could not be transported smoothly.

Therefore, an object of the present invention is to provide a vertical excavating device capable of solving the above-mentioned problems.

[0016]

According to a first aspect of the present invention, a hopper 4 is provided.
A vacuum suction device 2 installed on the ground for sucking air from inside by a blower 6, and a suction hose 10 connected to the hopper 4 and hanging down into the underground hole 1, the suction hose 10 extending and contracting in a longitudinal direction. A vertical portion having a freely-shaped shape, wherein a plurality of vertically spaced portions vertically suspended in the underground hole 1 are supported on the fixed side and are curved in a wavy shape in the longitudinal direction. This is a lifting device.

According to the first aspect of the present invention, the hopper 4 is
The excavated earth and sand in the underground hole 1 is conveyed to the hopper 4 via the suction hose 10 by sucking the air inside, so that the excavated earth and sand in the underground hole 1 can be conveyed to the ground. Suction hose 1
Numeral 0 denotes a shape that expands and contracts due to a change in the internal negative pressure, and a portion of the suction hose 10 that is lowered into the underground hole 1 is supported on the fixed side and does not extend by its own weight.
The part of the suction hose 10 that has fallen into the underground hole 1 is curved in a wavy shape in the longitudinal direction. The excavated earth and sand adhering to the inner surface peels off. Therefore,
Excavated earth and sand does not clog the portion of the suction hose 10 that is suspended in the underground hole 1.

The second invention comprises a vacuum suction device 2 installed on the ground for sucking air in a hopper 4 by a blower 6, and a suction hose 1 connected to the hopper 4 and dropped into a ground hole 1.
0, the suction hose 10 is extendable and contractible in the longitudinal direction, and a ground portion between the underground hole 1 and the vacuum suction device 2 is supported by a support 11 in a wavy shape in the vertical direction. Vertical lifting equipment.

According to the second aspect of the present invention, the hopper 4 is
The excavated earth and sand in the underground hole 1 is conveyed to the hopper 4 via the suction hose 10 by sucking the air inside, so that the excavated earth and sand in the underground hole 1 can be conveyed to the ground.

The suction hose 10 expands and contracts in the longitudinal direction due to a change in the internal negative pressure.
Since the ground portion between and is supported by being bent in a wavy shape in the vertical direction, the ground portion swings in the vertical direction due to a change in the internal negative pressure. As a result, excavated earth and sand can be smoothly transported without adhering or accumulating to the ground portion of the suction hose 10.

According to a third aspect of the present invention, there is provided a vacuum suction device 2 installed on the ground for sucking air in a hopper 4 by a blower 6, and a suction hose 1 connected to the hopper 4 and dropped in a ground hole 1.
0, and the suction hose 10 includes a plurality of suction hoses 10.
A vertical unloading device characterized in that the connecting device 30 has a shape that connects the outer peripheral sides of the two suction hoses 10 and connects the inner surfaces of the two suction hoses 10 flat. It is.

According to the third aspect of the present invention, the hopper 4 is
By sucking the air inside, the excavated earth and sand in the underground hole 1 is sucked and conveyed into the hopper 4, and the excavated earth and sand in the underground hole 1 can be conveyed to the ground.

Further, when the underground hole 1 becomes deep, the suction hose 10 can be added and lengthened, so that even when the deep underground hole 1 is excavated, the excavated soil in the underground hole 1 can be transported to the ground.

The connecting device 30 for connecting the two suction hoses 10 connects the two suction hoses 10 on the outer peripheral side and has an inner surface that is flat and continuous. There is no clogging due to excavated earth and sand.

According to a fourth aspect, in the third aspect, the suction hose 10 has a double hose shape having a soft inner cylinder 31, a soft outer cylinder 32, and a hard helical intermediate member 33,
One side joint 40 and the other side joint 41 having a spiral projection 44 on the inner surface and a flange 45 on the outer surface,
The connection device 3 is formed by the clamp members 42 that sandwich and connect each other.
0, and the spiral projection 44 of the one-side joint 40 and the other-side joint 41 is a vertical earthing device having a shape that is screwed to the spiral intermediate body 33 of the suction hose 10.

According to the fourth invention, the one-side joint 40 and the other-side joint 41 are screwed and attached to the two suction hoses 10, respectively, and the flange 45 of the one-side joint 40 and the other-side joint 4
By connecting the one flange 45 with the clamp member 42, the two suction hoses 10 can be connected continuously with their inner surfaces flat.

According to a fifth aspect of the present invention, there is provided a vacuum suction device 2 installed on the ground for sucking air in a hopper 4 by a blower 6, and a suction hose 1 connected to the hopper 4 and dropped into an underground hole 1.
0, and a means for heating the suction hose 10 is provided.

According to the fifth aspect of the present invention, since the suction hose 10 is heated, the water content of the excavated earth and sand adhering to the inner surface of the suction hose 10 evaporates at an early stage and is easily peeled off. Clogging can be prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a vacuum suction device 2 is installed on the ground away from an underground hole 1. The vacuum suction device 2 includes a hopper 4 mounted on a gantry 3 and a hopper 4
A blower 6 for sucking the air inside through a filter 5 is provided. The bottom of the hopper 4 is openable and closable, and a buckner (bag-shaped sediment storage container) 7 is placed below the hopper 4.

The hopper 4 has a suction hose (lifting hose).
10 is connected. This suction hose 10 is disclosed in
It is extendable and contractible in the longitudinal direction, similarly to the suction hose disclosed in JP-A-252137. The suction hose 10 has a support 11
Are arranged in a wavy shape along the ground in the vertical direction.
Hanged inside. The support 11 is a hose insertion portion 1
A plurality of piles 13 having a plurality of piles 2 are provided, and the plurality of piles 13 are erected on the ground at intervals, and the suction hose 10 is inserted into the hose insertion portion 12 of each of the piles 13 to form a wavy shape in the vertical direction. .

The support 11 may have the shape shown in FIG. A plurality of rings 16 are suspended from a horizontal rod 15 having a pair of support legs 14 at intervals to form a support 11.
The pair of support legs 14 are placed on the ground, and the suction hose 10 is inserted into the inside of the ring 16 (hose insertion portion) to form a wavy shape in the vertical direction.

The upper part of the underground hole 1 has a large diameter, and a fence 17 is installed around the large diameter underground hole 1. An intermediate portion of the suction hose 10 is supported on the fence 17 so as to form a substantially upward arc. A rope 18 is connected to the fence 17 and the rope 18 is hung in the underground hole 1. A plurality of portions of the suction hose 10 spaced apart in the longitudinal direction of the suction hose 10 are connected to the rope 18 by connecting means 19, respectively, and are supported on the fence 17 via the rope 18.
The portion 10a between the 0 connecting portions is curved in a circular arc shape, and the portion of the suction hose 10 that has fallen into the underground hole 1 is curved in the longitudinal direction in a wavy shape.

As shown in FIG. 3, the connecting means 19 has a shape in which a pair of semicircular mounting pieces 21 each having a hook 20 are openably and closably connected by a hinge or the like. The outer surface of the hose 10 is clamped, and the bolt 22 is tightened and attached to the suction hose 10 so as not to move in the longitudinal direction. Then, the rope 18 is connected to the hook 20 of the adjacent connecting means 19.

The connecting means 19 may have the shape shown in FIG. A flange 23 is fixed to an end of the suction hose 10, and a hook 24 is fixed to the flange 23. Adjacent flanges 23 are connected by bolts 25 to form a pair of suction hoses 10.
Connect. The rope 18 is connected to the hook 24.
In this way, the connection tool (flange) of the suction hose 10 and the connection means can be used.

As described above, the own weight of the portion of the suction hose 10 that has been lowered into the underground hole 1 is supported by the fence 17 via the rope 18, and the suction hose 10 does not exert any extension force due to its own weight.

The tip of the suction hose 10 is attached to a digging part 27 of a digging mechanism 26 for digging the bottom of the underground hole 1 and moves together with the digging part 27 to swing the digging part 27 up and down. Then, the suction part 10b is pressed against or separated from the excavated earth and sand.

Next, the operation of transporting excavated earth and sand will be described. The blower 6 is driven to suck the air in the hopper 4. As a result, the air in the suction hose 10 is sucked, and the excavated earth and sand is sucked and conveyed together with the suction of the air and accumulates in the hopper 4. Since the air in the hopper 4 is sucked through the filter 5, the earth and sand in the hopper 4 is not sucked into the blower 6. When the excavated sediment accumulates in the hopper 4, the bottom of the hopper 4 is opened and the hopper 4 falls into the buckner 7. When the inside of the buckler 7 is full, the buckner is taken out, transported by a crane or the like, and a new buckner 7 is placed under the hopper 4.

As described above, when the excavated earth and sand is sucked and conveyed, the suction portion 10b of the suction hose 10 is pressed against and separated from the excavated earth and sand, so that the negative pressure in the suction hose 10 changes intermittently. Since the portion of the suction hose 10 that is lowered into the underground hole 1 is connected to the lobe 18, no extension force acts on the portion of the suction hose 10 that is lowered into the underground hole 1 by its own weight. In addition, the portion 10a between the connecting portions of the suction hose 10 is curved in an arc shape and the lowered portion is curved in the longitudinal direction so as to be able to freely expand and contract in the longitudinal direction by external force.

In combination with the above, the portion of the suction hose 10 that is lowered into the underground hole 1 expands and contracts sufficiently due to intermittent changes in negative pressure. Is reliably peeled off, and it is possible to reliably prevent the suction hose 10 from being clogged with excavated earth and sand.

The part of the suction hose 10 from which the suction hose 10 is lowered is the inner wall (liner plate) of the underground hole 1 as shown in FIG.
The supporting member 1a may be supported by the supporting member 28 to form a wave shape in the longitudinal direction. Further, the rope 18 may be suspended by a crane 29 as shown in FIG. In other words, a plurality of vertically spaced portions of the vertical portion of the suction hose 10 that hang down into the underground hole 1 are fixed to the fixed side (fence 17, inner wall 1a, crane 29).
Etc.) and bend in a wavy shape in the longitudinal direction.

The ground portion of the suction hose 10 is the support 1
1, the suction hose 10 is supported in a wavy shape in the vertical direction, so that the ground portion of the suction hose 10 swings in the vertical direction following a change in the negative pressure in the suction hose 10. Thereby, the suction hose 10
The excavated soil is smoothly sucked and conveyed without adhering or accumulating on the ground portion of the ground.

As described above, the underground hole 1 is sequentially excavated,
When the length of the suction hose 10 becomes insufficient due to the deep hole 1, a new suction hose 10 is added to the suction hose 10. For example, the suction hose 10 is discontinuous near the ground, and is connected by the connection device 30. Then, if the length is insufficient, the connection part by the connection device 30 is separated, and a new suction hose 10 is connected by the connection device 30 to be longer.

The connection device 30 will be described with reference to FIGS. 7 and 8. The suction hose 10 has a double pipe shape in which a soft inner cylindrical body 31 and a soft outer cylindrical body 32 are concentrically connected via a hard spiral intermediate body 33, and the inner cylindrical body 31 and the outer cylindrical body 32 There is a spiral space 34 between them.

The connecting device 30 includes one side joint 40 and the other side joint 4.
1 and a clamp member 42. The one-side joint 40 and the other-side joint 41 have a spiral projection 44 provided integrally on the inner surface of the cylindrical body 43 and a flange 45 provided integrally on the outer periphery of the cylindrical body 43. The inner diameter of the cylindrical body 43 is substantially the same as the outer diameter of the outer cylindrical body 32, and the pitch a of the spiral protrusion 44 is the same as the pitch b of the spiral intermediate body 33. The clamp member 42 has a shape in which a pair of semicircular clamp pieces 46 are connected to be openable and closable with a pin 47 and can be connected with a bolt 48 in a closed state.

The one-side joint 40 is screwed into one of the suction hoses 10 while deforming the outer tubular body 32, and the end face of the suction hose 10 and the end face of the flange 45 are flush. The other joint 41 is screwed into the other suction hose 10 while deforming the outer cylindrical body 32, and the end face of the suction hose 10 and the end face of the flange 45 are flush. The flange 45 of the one-side joint 40 and the flange 45 of the other-side joint 41 are abutted, and a pair of clamp pieces 46 of the clamp member 42 are fitted into both the flanges 45 to tighten the bolt 48.

As a result, the end faces of the two flanges 45 come into contact with each other, and the end face of the inner cylinder 31 of one suction hose 10 and the end face of the inner cylinder 31 of the other suction hose 10 come into pressure contact with each other. 10 is connected to the inner surface of the connection portion without a gap.

As described above, one of the suction hoses 10 and the other of the suction hoses 10 are connected on the outer peripheral side, and the inner peripheral side of the suction hose 10 is not deformed at all. Continuous. As a result, the excavated earth and sand do not adhere to the connection between the two suction hoses 10, so that the excavated earth and sand is not clogged at the connection.

As shown in FIG. 7, since the width d of the spiral projection 44 is smaller than the width c of the spiral intermediate body 33 of the suction hose 10, the spiral intermediate body 32 and the spiral projection 44 have a smaller width d. There is a gap in the longitudinal direction of the suction hose between them. The outer cylinder 32 is soft and elastically deformable. For this purpose, one side joint 4
0, the suction hose 10 can move in the longitudinal direction with respect to the other-side joint 41 by the gap described above. Therefore, the suction hose 10 is connected even at the connection portion of the two suction hoses 10.
Can expand and contract in the longitudinal direction, thereby preventing the excavated earth and sand from adhering and accumulating on the connection portion.

In the above description, the suction hose 10 is a double hose. However, the suction hose 10 may have a shape without the outer cylinder 32 only by fixing the spiral intermediate body 33 to the inner cylinder 31.
That is, the two suction hoses 10 may be connected on the outer peripheral side and connected such that the inner surface is flat and continuous.

Further, the suction hose 10 may be heated. For example, the spiral space 3 of the double hose shown in FIG.
High-temperature air, such as exhaust gas from a prime mover of a vacuum suction device, is circulated through 4 to heat it. In this way, when highly viscous excavated soil containing water adheres to the inner surface of the suction hose 10, the moisture of the excavated earth and sand adhered evaporates, the adhesive force is weakened, and the excavated earth and sand is easily peeled. Therefore, it is possible to reliably prevent clogging of the suction hose 10 with excavated earth and sand in combination with expansion and contraction of the suction hose 10. The heating of the suction hose 10 may be performed by winding a heating wire.

In the above embodiment, the suction hose 10 is expanded and contracted by intermittent conversion of negative pressure. However, when the suction hose 10 is heated, clogging of excavated earth and sand can be performed without expanding and contracting the suction hose 10. Can be prevented.

For example, as shown in FIG.
Is dropped straight down into the underground hole 1, and the suction hose 10 is a double hose having a helical space 34 with an inner cylindrical body 31, an outer cylindrical body 32, and a helical intermediate body 33. A hot air blowing hose 50 is connected and connected to the spiral space 34 above the vertical portion of the suction hose 10.

The hot air blow hose 50 is supplied with air having a temperature higher by 30 ° C. to 40 ° C. than the outside air such as the exhaust gas of the motor of the vacuum suction device 2. By doing so, the intake hose 1
High-temperature air flows through the 0 spiral space 34, and the inner cylindrical body 31 is heated. In this case, the suction hose 10 may be a steel double tube that does not expand and contract.

As shown in FIG. 10, the suction hose 10 is dropped straight down into the underground hole 31. A heating wire 51 is wound around the outer surface of the suction hose 10. The suction hose 10 is heated by energizing the heating wire 51 to generate heat. In this case, the suction hose 10 may be made of steel which does not expand and contract.

[Brief description of the drawings]

FIG. 1 is a front view of a vertical excavating device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the support.

FIG. 3 is a perspective view of a connecting means.

FIG. 4 is a perspective view showing another embodiment of the connecting means.

FIG. 5 is a front view of a vertical excavating device showing a second embodiment of the present invention.

FIG. 6 is a front view of a vertical excavating device showing a third embodiment of the present invention.

FIG. 7 is a sectional view of a connection device.

FIG. 8 is an exploded perspective view of the connection device.

FIG. 9 is a front view of a vertical excavating device showing a fourth embodiment of the present invention.

FIG. 10 is a front view of a vertical excavating device showing a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Underground hole 2 ... Vacuum suction device 4 ... Hopper 6 ... Blower 10 ... Suction hose 11 ... Supporter 17 ... Fence 18 ... Rope 19 ... Connection means 28 ... Support member 29 ... Crane 30 ... Connection device 31 ... Inner cylinder 32 outer cylindrical body 33 spiral intermediate body 34 spiral space 40 one side joint 41 other side joint 42 clamp member 44 spiral projection 45 flange 50 hose for blowing hot air 51 heating wire

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Atsushi Yanagura 1200 Manda, Hiratsuka-shi, Kanagawa Pref. Komatsu Seisakusho Central Research Laboratory (72) Inventor Tohru Sato 3-18-18 Daikan-shi, Yamato-shi, Kanagawa Inside the Hakko Technology Development Center (72) Yoshimasa Tanaka 2-3-6 Akasaka, Minato-ku, Tokyo Inside the underground basic sales department, Komatsu Ltd. Sales Headquarters (72) Inventor Kaoru Tanaka 2-3-6 Akasaka, Minato-ku, Tokyo No. Komatsu Ltd. Underground Construction Machinery Division Engineering Department F-term (reference) 3F047 AA03 BA07

Claims (5)

[Claims] 1. A vacuum suction device (2) installed on the ground for sucking air in a hopper (4) by a blower (6), and connected to the hopper (4) to fall into an underground hole (1). A lowered suction hose (10), the suction hose (10) having a shape that is stretchable in the longitudinal direction, and includes a plurality of vertically spaced portions spaced vertically in the underground hole (1). A vertical embankment device which is supported on a fixed side and is curved in a wavy shape in a longitudinal direction. 2. A vacuum suction device (2) installed on the ground for sucking air in a hopper (4) by a blower (6), and connected to the hopper (4) to fall into an underground hole (1). It has a lowered suction hose (10), said suction hose (10) is extendable and contractible in the longitudinal direction, and a ground part between the underground hole (1) and the vacuum suction device (2) is supported by a support (11). A vertical embankment device, which is supported in a wavy shape in a vertical direction. 3. A vacuum suction device (2) installed on the ground for sucking air in the hopper (4) with a blower (6), and connected to the hopper (4) to fall into an underground hole (1). The suction hose (10) includes a lowered suction hose (10). The suction hose (10) is capable of freely adding a plurality of suction hoses (10) with a connecting device (30), and the connecting device (30) is provided with two suction hoses (10). A vertical earth-lifting device, wherein outer suction sides are connected to each other, and the inner surfaces of two suction hoses (10) are flat and continuous. 4. The suction hose (10) has a double hose shape having a soft inner cylinder (31), a soft outer cylinder (32), and a hard helical intermediate body (33). It has a projection (44) and has a flange (4
5) one side joint (40) and the other side joint (41),
A connecting device (30) is formed by a clamp member (42) that sandwiches and connects the flanges (45) to each other. The spiral projections (44) of the one-side joint (40) and the other-side joint (41) are suction hoses ( 10) spiral intermediate (33)
The vertical lifting device according to claim 3, wherein the vertical lifting device is shaped to be screwed into the vertical lifting device. 5. A vacuum suction device (2) installed on the ground for sucking air in a hopper (4) with a blower (6), and connected to the hopper (4) to fall into an underground hole (1). A vertical excavating device comprising a lowered suction hose (10), and means for heating the suction hose (10).