JP4428834B2 - Underground drilling rig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground excavation apparatus that inserts and excavates a chain with a plurality of excavating blades into the ground while rotating.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, underground excavation apparatuses that are used for civil engineering foundation work and that are inserted into the ground and excavate continuous wall grooves and the like by excavating blades are known. When excavating the ground, excavation is performed while injecting bentonite mud to stabilize the trench wall, or excavating while stirring soil and cement milk while injecting cement milk.
[0003]
In such an underground excavator, cement milk, mud, etc. are mixed in excavated soil and mud, especially when excavating the clay layer, and adhesive soil adheres around the excavating blade. For this reason, a device is provided for removing soil of the clay layer adhering to the periphery of the excavating blade, cobblestones, rakes and the like bitten between the excavating blades.
[0004]
For example, as disclosed in Japanese Utility Model Publication No. 6-37082, a flood pipe that can cover the entire length of the drum is provided, and injection nozzles of high-pressure jet water are attached to the flood pipe at regular intervals. Then, high pressure water is sprayed from the spray nozzle onto the drum, and the sticky soil to be attached is washed away.
[0005]
In addition, as disclosed in Japanese Patent Application Laid-Open No. 7-34485, there is also known one in which a large number of steel wires are arranged close to the outer periphery of the drum and the adhesive soil is scraped off by the steel wires.
[0006]
[Problems to be solved by the invention]
However, as disclosed in JP-A-8-333770, in an underground excavator in which a pair of excavating tools each having a plurality of excavating blades attached to an endless chain are arranged side by side, as indicated by arrows a and b in FIG. When excavating by rotating the pair of chains 100 and 102 in opposite directions, the excavated earth and sand gather between the pair of chains 100 and 102.
[0007]
When a sufficient amount of cement milk is not supplied during excavation, the agitation becomes insufficient, the excavated soil becomes clogged between a pair of chains, and the fluidity of the soil cement is deteriorated and the agitation ability is reduced. Further, there is a problem that the clogging excavated soil adheres to the excavating blade attached to the chain and the blade does not stand up and slips and the excavating ability is lowered.
[0008]
The subject of this invention is providing the underground excavation tool apparatus which prevented the fall of stirring capability and the fall of excavation capability.
[0009]
[Means for Solving the Problems]
In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
A chain is stretched between a pair of upper and lower sprockets, and a pair of drilling tools each having a plurality of drilling blades attached to the chain are arranged side by side on the same plane at the tip of the kelly bar. In the underground excavator for excavating by rotating both the chains in opposite directions,
A nozzle member provided with a discharge hole for discharging fluid toward the excavation blade between the two chains below the excavator and an air injection port for injecting air into the discharge hole is disposed. It is a featured underground excavator.
[0010]
Furthermore, the fluid may be cement milk. A plurality of nozzle members may be provided in the vertical direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described 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 hawk 6 so as to be tilted up and down. Two elongated guide rails 8 are laid along the longitudinal direction of the front surface of the reader 2.
[0012]
A main winch 12 is mounted on the construction machine main body 1, and a main wire 14 drawn from the main winch 12 is drawn along the leader 2, and a sheave 16 rotatably supported in the middle of the leader 2 is provided. Via a sheave 18 rotatably supported on the upper end of the reader 2. Furthermore, after the main wire 14 is stretched between the hanging sheave 20 and the sheave 22 provided at the upper end of the reader 2, one end thereof is fixed to the upper end of the reader 2. The suspended sheave 20 is connected to the tip of the kelly bar 26.
[0013]
On the guide rail 8, a pair of shaking rests 28 and 30 are slidably supported. The suspension bases 28 and 30 are configured to slidably support the kelly bar 26 and descend along the guide rail 8 as the kelly bar 26 descends. An underground excavator 32 is attached to the lower end of the keriva 26.
[0014]
As shown in FIG. 2, the underground excavator 32 includes a pair of excavating tools 34 and 36. Since both the excavating tools 34 and 36 have the same configuration, one excavating tool 34 will be described in detail. As shown in FIG. 3, the excavator 34 includes a pair of sprockets 38 and 40 that are arranged vertically at a predetermined interval, and a chain 42 is stretched between the sprockets 38 and 40. A plurality of excavation blades 44 in which excavation bits are implanted are attached to the links of the chain 42. The excavation blade 44 protrudes in the radial direction of the sprockets 38 and 40.
[0015]
Similarly, in the other excavator 36, a chain 46 is stretched between a pair of sprockets (not shown), and an excavating blade 48 is attached to the chain 46. As shown in FIG. 2, both the excavating tools 34 and 36 are arranged side by side on the same plane on the left and right. That is, the four sprockets 38, 40 of both excavating tools 34, 36 are arranged on the same plane side by side with the longitudinal center of the kelly bar 26 in between, and with the longitudinal center of the kelly bar 26 in between. Both chains 42 and 46 are arranged to face each other at a predetermined interval.
[0016]
In the present embodiment, drums 50 and 52 are integrally attached to the lower sprockets 40 of the excavating tools 34 and 36, and an excavating blade projecting radially is provided on the outer periphery of the drums 50 and 52. A plurality of 54 and 56 are mounted in two rows.
[0017]
Both the excavating tools 34 and 36 are rotated in opposite directions to each other as shown by arrows a and b in FIG. 2 by a hydraulic motor (not shown). The rotation direction is such that the digging blades 44 and 48 move from the bottom to the top inside the vicinity of the longitudinal center of the kelly bar 26, and the digging blades 44 and 48 move from the top to the bottom outside the actual excavation. Has been.
[0018]
Between the excavating blades 54 and 56 arranged in two rows, as shown in FIGS. 2 and 4, scrapers 58 and 60 are arranged on the longitudinal center of the kelly bar 26. The scrapers 58 and 60 are formed with a plurality of injection ports 62 and 64 that open toward the excavation blades 54 and 56. A supply flow channel 66 is connected to the injection ports 62 and 64.
[0019]
The injection ports 62 and 64 are configured so that the discharged cement milk is sprayed to the side surfaces of the excavating blades 54 and 56 arranged in two rows, respectively. Further, the injection ports 62 and 64 are formed so as to open toward the outer circumferences of the drums 50 and 52, respectively, and the cement milk discharged from the injection ports 62 and 64 is sprayed onto the outer circumferences of the drums 50 and 52. Has been.
[0020]
As shown in FIGS. 2 and 5, nozzle members 68 to 71 are attached to the upper ends of the scrapers 58 and 60. The nozzle members 68 to 71 are formed with discharge holes 72 to 75, and the discharge holes 72 to 75 are opened toward the excavation blades 44 and 48 of the chains 42 and 46, respectively. Further, the discharge holes 72 to 75 are each connected to the supply flow channel 66.
[0021]
The nozzle members 68 to 71 are provided on the lower side of the excavating tools 34 and 36. As shown in FIG. 2, cement milk or the like is provided on the excavating blades 44 and 48 that have been rotated near the longitudinal center of the kelly bar 26. Is configured to be discharged from the discharge holes 72 to 75.
[0022]
Further, as shown in FIG. 2, the nozzle members 68 to 71 are provided with other nozzle members 80 to 83 (only part of which are shown) along the longitudinal center of the kelly bar 26. A supply pipe 79 is connected to the supply flow path 66 so that cement milk is supplied from the outside.
[0023]
Furthermore, as shown in FIG. 5, pipes 84 to 87 are coaxially inserted into the discharge holes 72 to 75, and the air injection ports 88 to 91 at the ends of the pipes 84 to 87 are connected to the respective excavation blades 44. , 48 are opened. An air supply pipe 92 is connected to the pipes 84 to 87. The same applies to the other nozzle members 80 to 83.
[0024]
Next, the operation of the above-described underground excavation device 32 of this embodiment will be described.
First, the main winch 12 is driven to feed the main wire 14 while rotationally driving the chains 42 and 46 and the drums 50 and 52 of the underground excavator 32. As a result, the keriva 26 and the underground excavator 32 are lowered by their own weight to start excavation. At that time, the kelly bar 26 is prevented from shaking by the anti-rests 28 and 30.
[0025]
Excavation is performed by the excavating blades 44, 48, 54, 56 by the rotation of the chains 42, 46 and the drums 50, 52. In addition, cement milk is supplied to the supply pipe 79 , and the cement milk is discharged from the injection ports 62 and 64 through the supply flow channel 66. When the soil to be excavated is adhesive soil, it adheres to the outer periphery of the drums 50 and 52 and the periphery of the excavating blades 54 and 56.
[0026]
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. Moreover, the adhesive soil adhering to the side surface of the excavation blade 44 is washed away by the cement milk discharged from the injection ports 62 and 64. Moreover, the adhesive soil adhering to the outer periphery of each drum 50 and 52 is washed away.
[0027]
Further, as shown by arrows a and b in FIG. 2, the excavating blades 44, 48, 54, and 56 rotate from the outside to the inside at the lower side of the underground excavator 32, so that the excavated soil is , Gathered in the center in the longitudinal direction of the Keriba 26. 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 agitated.
[0028]
Since a sufficient amount of cement milk is supplied from the discharge holes 72 to 75, a “sabi-sabi” soil cement with high fluidity is obtained. Therefore, since the earth and sand are not clogged between the chains 42 and 46, the agitation performance is improved and the adhesion to the excavation blades 44 and 48 can be prevented, so that the excavation efficiency can be improved.
[0029]
Moreover, in this embodiment, by simultaneously injecting compressed air from the air injection ports 88 to 91, the flow effect of the soil cement upward is enhanced, and the stirring ability is further improved. The same applies to the other nozzle members 80 to 83.
[0030]
The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.
[0031]
【The invention's effect】
As described in detail above, the underground excavation device of the present invention improves the agitation performance without clogging the earth and sand between the two chains, and also prevents the adhering to the excavation blade, thereby improving the excavation efficiency. There is an effect that can be. Since compressed air is injected from the air injection port between the two chains, the flow effect of soil cement or the like as an upward fluid 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 excavation device as one embodiment of the present invention.
FIG. 2 is a front view of the underground excavation device of the present embodiment.
FIG. 3 is an enlarged front view showing a part of one excavation tool of the underground excavation device of the present embodiment in cross section.
4 is an AA enlarged sectional view of FIG. 2. FIG.
5 is an enlarged cross-sectional view taken along BB in FIG.
FIG. 6 is a schematic explanatory diagram of a conventional underground excavation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 2 ... Leader 26 ... Keriba 32 ... Underground excavator 34, 36 ... Excavator 38, 40 ... Sprocket 42, 46 ... Chain 44, 48, 54, 56 ... Excavator blade 58, 60 ... Scraper 62, 64 ... Injection port 66 ... Supply flow path 68-71, 80-83 ... Nozzle member 72-75 ... Discharge hole 88-91 ... Air injection port 92 ... Air supply pipe

Claims (3)

A chain is stretched between a pair of upper and lower sprockets, and a pair of drilling tools each having a plurality of drilling blades attached to the chain are arranged side by side on the same plane at the tip of the kelly bar. In the underground excavator for excavating by rotating both the chains in opposite directions,
A nozzle member provided with a discharge hole for discharging fluid toward the excavation blade between the two chains below the excavator and an air injection port for injecting air into the discharge hole is disposed. Underground excavator characterized. The underground excavation device according to claim 1, wherein the fluid is cement milk. The underground excavation device according to claim 1 or 2, wherein a plurality of the nozzle members are provided in a vertical direction.

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