JP2002054172A - Underground excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an underground excavating tool device preventing the degradation of the capabilities for agitation and excavation. SOLUTION: Chains 42 and 46 are tightly stretched between a pair of sprockets disposed on the upper and lower sides, and a pair of excavating tools 34 and 36, wherein a plurality of excavating blades 44 and 48 are mounted on the chains 42 and 46, is disposed at the end of a kelly-bar in such a manner as to be aligned at grade in a horizontal direction. The chains 42 and 46 are rotated for excavation in mutually reverse directions. Disposed nozzle members 68-71 are formed with discharge holes 72-75 for discharging cement milk toward the excavating blades 44 and 48 between the chains 42 and 46 on the lower sides of the excavating tools 34 and 36. The nozzle members 68-71 are formed with air injection port 88-91 for injecting air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground excavator for excavating a chain to which a plurality of excavating blades are attached while rotating the chain.

[0002]

2. Description of the Related Art Conventionally, there is known an underground excavator which is used for civil engineering foundation work or the like and which is inserted into the ground to excavate a continuous wall groove or the like with an excavating blade. When excavating underground, excavation is performed while pouring bentonite-based muddy water to stabilize the trench wall, or excavating while mixing cement and milk while pouring cement milk.

[0003] In such an underground excavator, cement milk, muddy water and the like are mixed with the excavated soil in a mud-like manner when excavating a clay layer, and sticky soil adheres around the excavation blade. For this reason, a device is provided for removing the soil of the clay layer adhering to the periphery of the excavation blade, cobblestones, recreation, etc., which are caught between the excavation blades.

[0004] For example, as disclosed in Japanese Utility Model Publication No. 6-37082, a sprinkler pipe capable of covering the entire length of the drum is provided.
High-pressure jet water jet nozzles are attached to the sprinkler at regular intervals. Then, high-pressure water is sprayed from the spray nozzle to the drum, and the adhesive soil to be attached is washed away.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-34485, there is also known a method in which a large number of steel wires are arranged close to the outer periphery of a drum, and the adhesive soil is scraped off by the steel wires.

[0006]

However, as disclosed in Japanese Unexamined Patent Publication No. Hei 8-333770, in an underground excavator in which a pair of excavating tools having a plurality of excavating blades attached to an endless chain are arranged side by side, FIG. As shown by arrows a and b, when excavating by rotating the pair of chains 100 and 102 in opposite directions to each other, the excavated earth and
They gather between 00 and 102.

[0007] If a sufficient amount of cement milk is not supplied during excavation, stirring becomes insufficient, excavated soil becomes clogged between a pair of chains, and the fluidity of soil cement deteriorates, and the stirring ability is reduced. I do. In addition, there is a problem that the clogged excavated soil adheres to the excavating blade attached to the chain, and the blade does not stand, causing a phenomenon of slipping and lowering the excavating ability.

[0008] It is an object of the present invention to provide an underground excavator which prevents a decrease in agitation ability and an excavation ability.

[0009]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, a chain is stretched between a pair of sprockets arranged vertically, and a pair of digging tools having a plurality of digging blades attached to the chain are arranged side by side on the same plane at the tip of the kelly bar, and the pair of digging In an underground excavator for excavating the two chains of a drill by rotating the chains in opposite directions, a nozzle provided with a discharge hole for discharging fluid toward the drill blade between the two chains under the drill. An underground drilling rig characterized by disposing members is the underground drilling rig.

The nozzle member may be provided with an air injection port for injecting air. Alternatively, the air injection port may be provided in the discharge hole. Further, the fluid may be cement milk. A plurality of the nozzle members may be provided in a vertical direction.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a self-propelled construction machine main body, and a leader 2 is supported by a stay 4 and a catching fork 6 so as to be able to be turned upside down. On the front surface of the reader 2, two long guide rails 8 are laid along the longitudinal direction.

A main winch 12 is mounted on the construction machine main body 1. A main wire 14 drawn from the main winch 12 is drawn along the leader 2 and is rotatably supported in the middle of the leader 2. Via a sheave 16, it is hung over a sheave 18 rotatably supported at the upper end of the reader 2. Further, the main wire 14 is hung between the suspension sheave 20 and the sheave 22 provided at the upper end of the reader 2, and one end thereof is connected to the upper end of the reader 2.
The hanging sheave 20 is connected to a tip of the kelly bar 26.

The guide rail 8 has a pair of anti-shake tables 2.
8, 30 are slidably supported. Rest rest 28,
30 slidably supports the keriba 26,
It is configured to descend along the guide rail 8 as it descends. An underground excavator 32 is attached to a lower end of the keleba 26.

The underground excavator 32 is, as shown in FIG.
A pair of excavators 34 and 36 are provided. Both excavators 34,
Since 36 has the same configuration, one excavator 34 will be described in detail. As shown in FIG. 3, the excavator 34 includes a pair of sprockets 38, 40 arranged at predetermined intervals above and below.
And a chain 4 is provided between the two sprockets 38 and 40.
2 is stretched. A plurality of digging blades 44 on which digging bits are implanted are attached to the links of the chain 42. The excavating blade 44 projects in the radial direction of the sprockets 38 and 40.

Similarly, the other excavating tool 36 has a chain 46 stretched between a pair of sprockets (not shown), and an excavating blade 48 is attached to the chain 46.
The two excavators 34, 36 are arranged side by side on the same plane on the left and right, as shown in FIG. That is, both excavators 34,
36, four sprockets 38, 40 are arranged side by side on the same plane with the longitudinal center of the keriba 26 therebetween, and the two chains 42, 46 are arranged with the longitudinal center of the keriba 26 therebetween. They are arranged facing each other at a predetermined interval.

In the present embodiment, drums 50 and 52 are integrally attached to the lower sprocket 40 of the excavators 34 and 36, and the outer periphery of the drums 50 and 52 projects radially. A plurality of excavating blades 54 and 56 are arranged and mounted in two rows.

The two excavators 34 and 36 are driven by hydraulic motors (not shown) so that the two chains 42 and 46
As shown by b, they are rotated in opposite directions. The rotation direction is such that the digging blades 44 and 48 move from bottom to top inside the vicinity of the longitudinal center of the keriba 26, and the digging blades 44 and 48 move from top to bottom on the outside where actual excavation is performed. Have been.

As shown in FIGS. 2 and 4, scrapers 58, 60 are disposed between the excavating blades 54, 56 arranged in two rows.
Are arranged on the center of the kelly bar 26 in the longitudinal direction.
The scrapers 58 and 60 are formed with a plurality of injection ports 62 and 64 that open toward the excavating blades 54 and 56.
A supply channel 66 is connected to the injection ports 62 and 64.

The injection ports 62 and 64 are configured such that the discharged cement milk is sprayed on the side surfaces of the excavating blades 54 and 56 arranged in two rows, respectively. The injection ports 62 and 64 are also formed to open toward the outer circumferences of both the drums 50 and 52, respectively, so that the cement milk discharged from the injection ports 62 and 64 is sprayed on the outer circumference of the drums 50 and 52. Have been.

At the upper ends of the scrapers 58 and 60, FIG.
As shown in FIG. 5, nozzle members 68 to 71 are attached. The nozzle members 68 to 71 have ejection holes 72 to 7.
5 are formed, and the discharge holes 72 to 75 are opened toward the excavating blades 44 and 48 of both chains 42 and 46, respectively. Further, the discharge holes 72 to 75 are connected to the supply flow paths 66, respectively.

The nozzle members 68 to 71 are provided below the digging tools 34 and 36, and are provided on the digging blades 44 and 48 rotating near the longitudinal center of the kelly bar 26 as shown in FIG. Discharge holes 72-75 for cement milk etc.
It is configured to be able to discharge from the.

As shown in FIG. 2, the nozzle members 68 to 71 are provided with other nozzle members 80 to 83 (only some of which are shown) along the longitudinal center of the kelly bar 26. A supply pipe 84 is connected to the supply channel 66 so that cement milk is supplied from the outside.

Further, as shown in FIG.
5, pipes 84 to 87 are coaxially inserted, and air injection ports 88 to 91 at the tips of the pipes 84 to 87 are provided.
Are opened toward the respective excavation blades 44 and 48. An air supply pipe 92 is connected to the pipes 84 to 87. The same applies to the other nozzle members 80 to 83.

Next, the operation of the above-described underground excavator 32 of this embodiment will be described. First, the underground excavator 32
While rotating the chains 42 and 46 and the drums 50 and 52, the main winch 12 is driven and the main wire 14 is paid out. As a result, the keriba 26, the underground excavator 32
Excavation is started by descending under its own weight. At this time, the kelly bar 26 is prevented from swinging by the shake stoppers 28 and 30.

Excavation is performed by the respective excavating blades 44, 48, 54 and 56 by the rotation of the chains 42 and 46 and the drums 50 and 52. In addition, the cement milk is supplied to the supply pipe 84, and the cement milk is discharged from each of the injection ports 62 and 64 via the supply passage 66. When the excavated soil is cohesive soil, the outer periphery of the drums 50 and 52 and the excavation blades 54 and 52
Attaches around 56.

The adhesive soil that has entered between the two rows of excavating blades 54 and 56 is scraped off by the scrapers 58 and 60 as the drums 50 and 52 rotate. In addition, the injection port 62,
The adhesive soil adhering to the side surface of the excavation blade 44 is washed away by the cement milk discharged from the excavator 64. Further, the adhesive soil adhered to the outer periphery of each of the drums 50 and 52 is washed away.

Each of the excavating blades 44, 48, 54, 56
Is an underground drilling rig, as shown by arrows a and b in FIG.
As it rotates from the outside to the inside below 2, the excavated soil collects at the longitudinal center of the keriba 26. The cement milk is discharged from the discharge holes 72 to 75 toward the earth and sand, and the earth and sand and the cement milk are stirred.

Since a sufficient amount of cement milk is supplied from the discharge holes 72 to 75, a "fluent" soil cement with high fluidity is obtained. Accordingly, the agitation performance is improved without the earth and sand being clogged between the two chains 42, 46, and the adhesion to the excavation blades 44, 48 can be prevented, so that the excavation efficiency can be improved.

Further, in the present embodiment, by simultaneously injecting compressed air from the air injection ports 88 to 91, the upward flow effect of the soil cement is enhanced, and the stirring ability is further improved. In addition, the injection of the compressed air from the air injection ports 88 to 91 may be performed as needed. The same applies to the other nozzle members 80 to 83.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0031]

As described above in detail, the underground excavator of the present invention improves the agitation performance without the earth and sand clogging between the two chains and can prevent the sediment from adhering to the excavation blade. There is an effect that the efficiency can be improved. If compressed air is injected from the air injection port between the two chains, the flow effect of the soil cement upward can be enhanced, and the stirring ability can be further improved.

[Brief description of the drawings]

FIG. 1 is a side view of a construction machine equipped with an underground excavator as one embodiment of the present invention.

FIG. 2 is a front view of the underground excavator of the embodiment.

FIG. 3 is an enlarged front view showing a part of one of the excavating tools of the underground excavator of the present embodiment in cross section.

FIG. 4 is an enlarged sectional view taken along the line AA of FIG. 2;

FIG. 5 is an enlarged sectional view taken along the line BB of FIG. 2;

FIG. 6 is a schematic explanatory view of a conventional underground excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 2 ... Leader 26 ... Keriva 32 ... Underground excavator 34, 36 ... Excavating tool 38, 40 ... Sprocket 42, 46 ... Chain 44, 48, 54, 56 ... Excavating blade 58, 60 ... Scraper 62, 64 injection port 66 supply channel 68-71, 80-83 nozzle member 72-75 discharge port 88-91 air injection port 92 air supply pipe

Claims (5)

[Claims] A chain is stretched between a pair of sprockets arranged vertically, and a pair of digging tools having a plurality of digging blades attached to the chain are arranged side by side on the same plane at the tip of a kelever, An underground excavator for rotating the two chains of a pair of excavators in directions opposite to each other, and excavating a discharge hole for discharging fluid toward the excavation blade between the two chains below the excavator. An underground excavator wherein the provided nozzle member is arranged. 2. The underground excavator according to claim 1, wherein an air injection port for injecting air into the nozzle member is provided. 3. The underground excavator according to claim 2, wherein the air injection port is provided in the discharge hole. 4. The underground excavator according to claim 1, wherein the fluid is cement milk. 5. The underground excavator according to claim 1, wherein a plurality of the nozzle members are provided in a vertical direction.