JP2006241911A - Underground excavating device and underground excavating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground excavating device enabling well excavation for a short time, and also to provide an underground excavating method for excavating a well in a short time by using the same. <P>SOLUTION: The underground excavating device has an external pipe 10 comprising a leading pipe 1 with an acute top end provided at a top end part and a cylindrical well pipe 3 connected with an upper end thereof. A cylindrical filter pipe 2 having a through hole in a pipe barrel is inserted into the external pipe 10, and the leading pipe 1 and the well pipe 3 are separably assembled in a vertical direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an underground excavation apparatus including a leading part, a filter pipe, and a well pipe, and more particularly to a connecting structure for performing a rotary excavation force of a leading part having a drilling screw by transmission from a well pipe.

  Conventionally, in well excavation, as shown in FIGS. 9A to 9C, by using a method such as a so-called percussion type or a rotary type, the drainage 20 is put out on the ground and a vertical hole 21 is dug, and the well pipe 3 and the filter pipe A method (c) in which 2 is inserted (b), and sand or gravel 22 is backfilled in the gap with the ground for the purpose of filtration. In general, there are many other techniques for providing vertical holes for wells or buried piles in the ground.

  As a method for digging a vertical hole for a buried pile, Japanese Patent Laid-Open No. 2002-363981 (Patent Document 1) discloses a method in which a tip shaft portion having a tip wing is attached to a lower end of an upper shaft portion so as to be detachable via a detachment mechanism. It is disclosed that a hole is formed by rotating inside and reaching a predetermined depth, separating the upper shaft portion by the desorption mechanism and pulling up only the upper shaft portion.

In Patent Document 1, a male screw is formed at the upper end of the tip shaft portion as a detaching mechanism, and is screwed with the female screw at the lower end of the upper shaft portion. It has a thread shape that can be combined. For this reason, if the upper shaft part is reversely rotated at the time of separation, both can be easily unwound.
Japanese Patent Application Laid-Open No. 2003-301585 (Patent Document 2) discloses a connection for transmitting a rotational force with high efficiency by fitting an auger shaft of the same shape into a fitting hole of an auger shaft for excavating the ground. Proposed structure.
JP 2002-363981 A Japanese Patent Application Laid-Open No. 2003-301585

Recently, groundwater has been secured along with the expansion of land development, as well as agricultural land improvement, road construction ground maintenance, spring water drainage in construction ground maintenance, and liquefaction soil improvement. Temporary well drilling for securing water is also frequently performed at construction / civil engineering sites and farmland development sites.
In such a field, in particular, there is a demand for economical and short-time well drilling with a simple structure using a steel pipe or the like.

The excavator structure of Patent Documents 1 and 2 can be used to excavate vertical holes for wells and buried piles, but excavator for burying well pipes and filter pipes in the ground simultaneously with excavation propulsion. It is not structurally simple and economical.
An object of the present invention is to provide an underground excavation apparatus and excavation method in a short time with a simple structure of a well pipe in which a filter pipe is inserted.

In order to achieve the above object, an underground excavation device according to claim 1 of the present invention is provided.
An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. It is characterized by that.
The underground excavation device according to claim 2 is characterized in that in claim 1,
The upper projecting portion 4a is fixed at equal intervals on the outer periphery of the leading conduit 1 so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The rotation of the well pipe 3 is transmitted to the leading conduit 1 through the lower projecting portion 4b and the upper projecting portion 4a.

The underground excavation device according to claim 3 is described in claim 1 or 2,
A packing ring 11 is sandwiched around the outer periphery in the vicinity of the upper end of the filter tube 2 inserted in the well tube 3.
The underground excavation device according to claim 4 is any one of claims 1 to 3,
A plurality of inner projecting portions and suspension rings are provided on the inner periphery of the lower end of the well tube 3, and a plurality of outer projecting portions are provided on the outer periphery of the upper end of the filter tube 2 inserted into the well tube 3. The inner and outer protrusions transmit the rotational force of the well pipe to the filter pipe 2 when the pipe is pulled up to the ground, and the inserted filter pipe 2 can be pulled up by the suspension ring and collected on the ground. It is characterized by that.
The underground excavation method according to claim 5,
An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. Using underground drilling equipment,
The upper projecting portion 4a is fixed to the outer periphery of the leading conduit 1 at equal intervals so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The rotation of the well pipe 3 is transmitted to the leading conduit 1 through the lower protruding portion 4b and the upper protruding portion 4a.
The tip pipe 1 is rotated and excavated in the ground to reach a predetermined depth, and then only the well pipe 3 is pulled up to the ground with the tip pipe 1 remaining.

The underground excavation method according to claim 6,
An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. Using underground drilling equipment,
The upper projecting portion 4a is fixed to the outer periphery of the leading conduit 1 at equal intervals so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The rotation of the well pipe 3 is transmitted to the leading conduit 1 through the lower protruding portion 4b and the upper protruding portion 4a.
After the tip pipe 1 is rotated and the ground is excavated to reach a predetermined depth, the well pipe is formed by the length of the filter pipe while leaving the tip pipe 1 and the filter pipe 2 fixed to the tip pipe. It is characterized by being raised to the ground.

The underground excavation apparatus of the present invention has a very simple structure, and has a structure capable of transmitting the rotational force of the upper well pipe to the excavation rotation of the excavation screw at the leading end of the tip. Are assembled in a separable manner, and some of the components can be reused.
In addition, since the underground excavation method of the present invention does not require backfilling, excavation work can be performed in a short time with extremely simple work.
Furthermore, the underground excavation method of the present invention can be said to be an environmentally friendly method because there is no need for soil removal and there is no need for soil removal prescription.

Hereinafter, the underground excavation apparatus and the well excavation method of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory view showing an embodiment of the excavator of the present invention.
FIG. 2 is a schematic exploded perspective view of the excavator shown in FIG.
1 and 2, the excavator is
An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 having a through-hole provided in the tube wall is inserted inside the outer tube 10, and the front conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction.

At the lower end of the front conduit 1, a drilling blade 1 a in which four triangular plates having a sharp tip are joined back to back by a means such as welding is fixed to the tip.
In addition, a round excavation screw 1b is provided on the outer periphery of the front conduit 1 in the vertical direction, and a part of the screw is cut out to be opened up and down. It is a twisted shape suitable for sending backwards.
In the figure, the excavating blade 1a shows a form in which four triangular plates are joined back to back. However, the excavating blade 1a is not limited to a triangular shape, and various forms such as a pyramid, a cone, and a shape of a drill blade can be used as appropriate. You can choose.
In addition, the drilling screw 1b is provided with a plurality of screws on the outer periphery on the lower end side of the front conduit 1 as long as the drilling screw 1b has a function of sending the soil to the rear (upward) simultaneously with advanced drilling. May be.

Further, the four upper projecting portions 4 a are fixed to the outer periphery of the front conduit 1 at equal intervals so that the upper end in the longitudinal direction protrudes from the upper end of the front conduit 1.
In addition, a lower projecting portion 4b having the same shape as the upper projecting portion 4a of the front conduit 1 is also provided on the outer periphery of the lower end of the well tube 3 having the same diameter as that of the front conduit 1, and the lower end in the longitudinal direction is the well tube 3 It is fixed at regular intervals so as to protrude from the lower end of.
Then, the positions of the upper and lower projecting portions (4a, 4b) fixed to the front conduit 1 and the well tube 3 in the rotational direction so that the lower end of the well tube 3 abuts the upper end of the front conduit 1 Shift and connect,
The rotation of the well pipe 3 in the direction of arrow A is transmitted to the front conduit 1 via the lower protruding portion 4b and the upper protruding portion 4a.
In addition, it is desirable that the upper and lower projecting portions (4a, 4b) are firmly attached to the front conduit 1 and the well tube 3 by means of welding or the like.

As can be seen from FIG. 1 and FIG. 2, a filter tube 2 having a through hole around the tube body is inserted inside the connected leading conduit 1 and well tube 3.
In FIG. 1, the filter pipe 2 is shown so that it can be seen from between the four upper and lower projecting portions (4 a, 4 b) for easy understanding, but in the state where it is excavated downward, the well pipe 3 The upper end and the lower end of each of the leading conduits 1 are connected to each other, and the filter tube 2 is not visible from the outside.
The material of the filter tube 2 is preferably made of a material that is expected to have a rust prevention effect such as stainless steel, and the mesh opened in the filter tube 2 is a through-hole having a size that does not allow sand or stones to pass through. It is desirable to be.

FIG. 3 is a sectional view taken along the line XX of FIG. 1, and in the excavation state, the well pipe 3 is rotated by the leading conduit 1 (not shown) via the upper projecting portion 4a and the lower projecting portion 4b. 1 is a diagram for explaining a mechanism for transmitting to the first position.
One surface of the lower protrusion 4b comes into contact with one surface of the upper protrusion 4a, and the rotation of the lower protrusion 4b in the direction of arrow A is transmitted to the corresponding upper protrusion 4a as the direction of arrow B.
In this way, the plurality of projecting portions fixed at an angular interval of approximately 90 ° on the outer circumferences of the front pipe 1 and the well pipe 3 are in contact with each other, so that the rotational force from the well pipe 3 is evenly distributed. Can be transmitted to the leading conduit 1.
In the above description, the case where four upper and lower projecting portions are provided at equal angular intervals has been described. However, in the present invention, if the rotational force from the well pipe 3 can be evenly distributed and transmitted to the leading conduit 1. The number of protruding portions and the fixed interval are not specified.

FIG. 4 is a schematic explanatory diagram of an aspect of excavating and propelling the ground using the excavator of the present invention described above.
As shown in FIG. 4A, in the excavator, the tip pipe 1 and the well pipe 3 are integrally connected, and the rotational force (arrow A1) given to the well pipe 3 4a, 4b) is transmitted to the leading conduit 1, and the leading conduit 1 is excavated and propelled downward (arrow B) while rotating in the same direction, to a predetermined depth as shown in FIG. 4 (b). When it reaches, the rotation is stopped and the excavation work is finished.
Next, as shown in FIG. 4 (c), the upper well tube 3 is not rotated, and the mesh portion is exposed upward (arrow A2) by the approximate tube length of the filter tube 2 inserted therein.
For the parallel movement in the longitudinal direction of the well pipe 3 with respect to the leading pipe 1 (in the direction of the well pipe axis pulled up), the projecting portions do not interfere with each other (since they are not rotated), so it is easy The well tube can be separated from the previous conduit.
In addition, as shown in FIG.4 (d), the unnecessary part cuts and removes the upper part of the well pipe 3 pulled up on the ground as needed (C position).
At a predetermined depth, the filter pipe 2 is disposed at a position reaching the groundwater vein, so that the groundwater can be pumped through the filter pipe 2.

FIG. 5 is a schematic perspective view in which the packing ring 11 is attached to the outer periphery of the upper end of the filter tube 2.
As shown in the drawing, when the elastic packing ring 11 is previously sandwiched in the gap between the outer periphery of the upper end of the filter tube 2 and the inner wall of the lower end of the well tube, the well tube 3 is lifted upward to filter the filter tube 2. In the exposed state, muddy water in the underground soil does not enter the filter tube 2, which is preferable.
The material of the packing ring 11 is not particularly limited as long as it can seal the gap, but is preferably made of an elastic material so that it can be adjusted according to the size of the gap.
The effect of closing the gap between the filter tube 2 and the well tube 3 is the same if the packing ring 11 is provided on the inner periphery 3a at the lower end of the well tube 3 instead of attaching the packing ring 11 to the outer periphery of the upper end of the filter tube 2.

FIG. 6 is a schematic view for explaining a method of draining underground using the excavator of the present invention.
As shown in the figure, after excavation in the ground reaches a predetermined depth, only the leading portion 1 and the filter tube 2 are left in the ground, and all the well tubes 3 are pulled out to the ground.
In this method, the filter tube 2 is fixed to the leading conduit 1 so that the filter tube 2 does not move up with the well tube 3 when the well tube 3 is removed.
For example, in a region where liquefaction is expected during an earthquake, there is a “method of eliminating pore water pressure” as one of the measures against liquefaction. The well pipe of the present invention can also be expected to have the effect and performance as a drain pipe of this construction method. . As a countermeasure against liquefaction of buildings and civil engineering structures, it works to dissipate pore water pressure in the ground at the time of an earthquake and can be expected to prevent liquefaction.
In addition, if the groundwater level is higher than the depth of excavation at the construction / civil engineering site, an accident such as landslide collapse is expected unless the groundwater level is lowered, and the well pipe in the present invention is used as a pumping pipe for the groundwater level lowering method. The groundwater on site can be pumped and drained efficiently, enabling safe construction work.

FIG. 7 is a schematic view illustrating a method for recovering the excavator of the present invention.
As shown in FIG. 7A, the reinforcing tube 2a is fixedly provided on the outer periphery in the vicinity of the upper end of the filter tube 2, and four outer projecting portions 4c are attached to the outer periphery of the reinforcing tube 2a.
Further, four inner projecting portions 4d are attached to the inner periphery 3a at the lower end of the well tube 3 in which the reinforcing tube 2a is inserted.
Then, when the lower end of the well pipe 3 is inserted from the upper end of the filter pipe 2 and the outer projecting portion 4c of the reinforcing pipe 2a and the inner projecting portion 4d of the well pipe 3 are substantially in the same position,
A separately prepared suspension ring 5 is fixed to the lower end of the inner wall 3a of the well pipe 3 by welding.

When the suspension ring 5 is attached as described above and the well tube 3 is lifted upward, the suspension ring 5 is locked to the inner projecting portion 4d, and the filter tube is lifted together with the well tube 3 without coming out of the well tube 3. And can be recovered.
When such a recovery is required, for example, when closing the temporary well, the well pipe 3 is lifted to the ground and the filter pipe 2 inserted therein is also rotated and lifted together.

The method for collecting the filter tube 2 will be described in detail with reference to FIG.
FIG. 8A is a longitudinal sectional view of a connected state in which the reinforcing tube 2a of the filter tube 2 is inserted into the well tube 3, and FIG. 8B is a view at the YY position in FIG. 8A. It is a cross-sectional view.
In FIG. 8A, the illustration of the external projecting portion provided on the outer periphery of the well pipe 3 is omitted.
First, the reinforcing tube 2a of the filter tube 2 is inserted into the well tube 3 to be connected.
As a preparatory step before excavation, as shown in FIG. 7B, the well pipe 3 is inserted into the reinforcing pipe 2a (indicated by a dotted line, the outer projecting portion on the outer periphery thereof is not shown).

As shown in FIG. 8 (b), when the well tube 3 is rotated in the direction of arrow A, the filter tube 2 is rotated in the direction of arrow B via the inner projecting portion 4d and the outer projecting portion 4c. The well pipe 3 is lifted upward, the inner projecting portion 4d is locked by the suspension ring 5, and the filter pipe 2 is lifted together with the well pipe 3 to be collected.
In FIG. 7, the suspension ring 5 is described as being attached to the inner wall 3 a of the well pipe 3.
As shown in FIG. 8 (c), an extension ring 5b is provided by extending all or part of the peripheral edge of the lower end of the well pipe 3 inward, and the outer end attached to the outer periphery of the reinforcing pipe 2a at the upper end of the extension ring 5b. The filter tube 2 can be lifted together with the well tube 3 to be lifted and collected by protruding from the lower end of the protruding portion 4c.

  The present invention is simple as a drilling device that embeds well pipes and filter pipes in the ground simultaneously with excavation propulsion, and can secure water for temporary construction sites and improve land in a short time economically. Industrial utility is high.

FIG. 1 is a schematic explanatory view showing an embodiment of the excavator of the present invention. FIG. 2 is a schematic exploded perspective view of the excavator shown in FIG. 1. It is XX cutaway drawing of FIG. It is a schematic explanatory drawing about the aspect which excavates and promotes the ground using the excavator of the present invention. The schematic perspective view which attached the packing ring 11 to the upper end outer periphery of the filter pipe | tube 2 is shown. It is the schematic explaining the water draining method in the ground using the excavator of this invention. It is the schematic explaining the method to collect | recover the excavation apparatuses of this invention. It is explanatory drawing of a filter tube collection | recovery method. It is explanatory drawing of the conventional well drilling method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Prior pipe 1a ... Excavation blade 1b ... Excavation screw 2 ... Filter pipe 2a ... Reinforcement pipe 3 ... Well pipe 4a ... Upper projecting part (outer part outer periphery)
4b ... Lower projecting part (well pipe outer periphery)
4c ... Projection part (outer periphery of reinforcing tube)
4d ... Inner protrusion (inner wall of well pipe)
5 ... Suspension ring 5a ... Ring welded portion 10 ... Outer tube 11 ... Packing ring 20 ... Soil removal 21 ... Vertical hole 22 ... Backfill soil

Claims (6)

An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. An underground excavator characterized by that. The upper projecting portion 4a is fixed at equal intervals on the outer periphery of the leading conduit 1 so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The underground excavation device according to claim 1, wherein the rotation of the well pipe (3) is transmitted to the tip conduit (1) through the lower projecting portion (4b) and the upper projecting portion (4a). . The underground excavation device according to claim 1 or 2, wherein a packing ring (11) is sandwiched around an outer periphery in the vicinity of the upper end of the filter tube (2) inserted into the well tube (3). A plurality of inner projecting portions and suspension rings are provided on the inner periphery of the lower end of the well tube 3, and a plurality of outer projecting portions are provided on the outer periphery of the upper end of the filter tube 2 inserted into the well tube 3. The inner and outer protrusions transmit the rotational force of the well pipe to the filter pipe 2 when the pipe is pulled up to the ground, and the inserted filter pipe 2 can be pulled up by the suspension ring and collected on the ground. The underground excavation device according to any one of claims 1 to 3. An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. Using underground drilling equipment,
The upper projecting portion 4a is fixed to the outer periphery of the leading conduit 1 at equal intervals so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The rotation of the well pipe 3 is transmitted to the leading conduit 1 through the lower protruding portion 4b and the upper protruding portion 4a.
A ground excavation method characterized in that, after the tip conduit 1 is rotated and excavated in the ground to reach a predetermined depth, only the well pipe 3 is pulled up to the ground with the tip conduit 1 remaining. An outer tube 10 that is installed at the distal end portion and includes a tip conduit 1 having a sharp tip and a cylindrical well tube 3 connected to the upper end thereof;
A cylindrical filter tube 2 in which a through hole is provided in the tube body is inserted inside the outer tube 10, and the tip conduit 1 and the well tube 3 are assembled so as to be separable in the vertical direction. Using underground drilling equipment,
The upper projecting portion 4a is fixed to the outer periphery of the leading conduit 1 at equal intervals so that the upper end in the longitudinal direction protrudes from the upper end of the leading conduit 1.
The lower projecting portion 4b is fixed to the outer periphery of the well pipe 3 at equal intervals so that the lower end protrudes from the lower end of the well pipe 3.
The positions of the upper and lower projecting portions (4a, 4b) fixed to the front pipe 1 and the well pipe 3 are rotated so that the lower end of the well pipe 3 is abutted with the upper end of the front pipe 1 Shift in the direction and connect
The rotation of the well pipe 3 is transmitted to the leading conduit 1 through the lower protruding portion 4b and the upper protruding portion 4a.
After the tip pipe 1 is rotated and the ground is excavated to reach a predetermined depth, the well pipe is formed by the length of the filter pipe while leaving the tip pipe 1 and the filter pipe 2 fixed to the tip pipe. An underground excavation method characterized by lifting to the ground.

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