JP3294542B2 - Underground drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground excavation tool which is inserted into the ground while excavating while rotating a cutting blade through a chain stretched between sprockets.

[0002]

2. Description of the Related Art There has been known an underground excavation tool which is used for civil engineering foundation work and the like, and which is inserted into the ground and excavates a continuous wall groove or the like with a rotating excavating blade. In such an underground excavation tool, a chain having an excavation blade attached between a pair of sprockets is stretched, and a rotating plate provided with an excavation blade is also attached to the sprocket so that a continuous wall groove can be excavated. ing. When excavating with an underground excavation tool, muddy water, a stabilizing liquid, or the like is injected to prevent collapse of the hole wall.

[0003]

However, in such a conventional device, the sprocket and the chain are inserted into the continuous wall groove during excavation in a state where the sprocket and the chain are exposed.
Sand or pebbles may be bitten between the sprocket and the chain. The bite of sand or pebbles will increase the chain tension, increasing power loss and breaking the chain.
There has been a problem that sprocket teeth may be damaged.

[0004] It is an object of the present invention to provide an underground excavator that prevents biting of sand, pebbles and the like.

[0005]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in an underground excavation tool that stretches a chain between a pair of sprockets and drives the sprocket on the driving side to rotate a cutting blade through the chain to excavate, a fluid is directed toward the teeth of the sprocket. This is an underground excavation tool provided with a nozzle member having an injection hole that discharges water.

Further, a scraper member may be provided for covering teeth of the sprocket not meshing with the chain and for scraping off earth and sand adhered to the side surface of the sprocket. Further, it is preferable that the injection hole is opened in a radial direction of the sprocket and toward a center of the sprocket.

[0007]

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, on which a leader 2 is erected. An unillustrated elevating table is supported by the reader 2 so as to be able to move up and down along the reader 2, and a kelly bar 4 is attached to the elevating table. Keriva 4
The underground excavation tool 6 is attached to the tip of.

A hose reel 8 is attached to a side surface of the reader 2, and hoses such as a hydraulic hose 9 are wound around the hose reel 8. When the hose reel 8 pulls the hydraulic hose 9, the hose reel 8 rotates and the hydraulic hose 9 is pulled out. Further, the hose reel 8 is configured to be able to take up the hydraulic hose 9 pulled out by being rotated by the urging force of a spring or the like. A hydraulic source (not shown) is mounted on the construction machine body 1, and the hydraulic source is connected to one end of a hydraulic hose 9 wound around a hose reel 8.

As shown in FIG. 2, the underground excavating tool 6 includes a driving-side sprocket 10 and one driven-side sprocket 12, and the driving-side sprocket 10 is disposed above the excavating tool main body 14. , And is configured to be driven by a hydraulic motor 16 attached to the excavator body 14.

The driven sprocket 12 is shown in FIGS.
As shown in the figure, the lower part of the drilling tool body 14 is rotatably supported via a pair of bearings 17 and 18. Both sprockets 10 and 12 are exposed to the outside of the drilling tool body 14. The bearings 17 and 18 are held on the excavator body 14 by caps 20 and 22 attached to the excavator body 14.

A chain 24 is stretched between the driving sprocket 10 and the driven sprocket 12, and digging blades 26 are attached to the chain 24 at predetermined intervals toward the outside. Driven sprocket 1
2 is projected in the axial direction from the drilling tool main body 14,
Rotating plates 28 and 30 are fixed to both ends. A plurality of excavating blades 32 for underground excavation are radially attached to the outer periphery of the rotating plates 28 and 30.

The excavator body 14 has a pair of scraper members 3 opposed to the teeth 12a of the sprocket 12 on the driven side.
4,36 are attached. Scraper member 34,
36 are slightly wider than the width of the teeth 12a and
Grooves 34a, 36a are formed so as to have a slight gap with the tip of 2a, and are arranged so that the teeth 12a of the driven sprocket 12 pass through the grooves 34a, 36a.
The sprocket 12 is provided so as to cover most of the teeth 12a of the sprocket 12 that do not mesh with the chain 24 so that the teeth 12a that do not mesh with the chain 24 are less exposed.

On the other hand, nozzle members 38, 40 are attached to the outside of the scraper members 34, 36, and the nozzle members 38, 40 are formed with injection holes 42, 44 for discharging fluid toward the teeth 12a. Have been. Injection hole 42,
44 is opened in the radial direction and toward the center of the sprocket 12 on the driven side.

The injection holes 42 and 44 are provided with the scraper member 3.
The supply holes 46, 48 are connected to supply holes 46, 48, and supply pipes 50, 52 are connected to the supply holes 46, 48. A supply hose (not shown) is connected to the supply pipes 50 and 52, and this supply hose is also wound around the hose reel 8, so that a fluid, for example, compressed air, water, grout, or the like can be supplied to the supply hose from the outside. Is configured.

In this embodiment, as shown in FIG. 2, a similar scraper member 5 in which the scraper members 34 and 36 are integrally formed on the sprocket 10 on the driving side.
4. Nozzle members 56 and 58 are provided. Supply pipes 60 and 62 are connected to the nozzle members 56 and 58, respectively.
It is configured such that fluid can be supplied through the supply pipes 60 and 62.

Next, the operation of the above-described underground excavator of this embodiment will be described. First, when high-pressure hydraulic oil is supplied from a hydraulic source (not shown) to the hydraulic motor 16 via the hydraulic hose 9, the hydraulic motor 16 is driven to rotate. The rotation of the hydraulic motor 16 causes the drive sprocket 10 to rotate.

Accordingly, the driven sprocket 12 is rotated via the chain 24, and the excavating blade 2 of the chain 24 is rotated.
6 is rotated, and the excavating blades 32 of the rotating plates 28 and 30 are rotated.
Is rotated. As shown by the arrow in FIG.
Is excavated by the excavating blades 26 and 32 by inserting the underground into the ground.

As the excavation proceeds, water or grout is injected to prevent collapse of the hole wall, and the excavation is performed therein. For this reason, the surface of both sprockets 10 and 12
Mud, sand, pebbles, etc. adhere. During excavation, fluid is supplied to the underground excavation tool 6 through supply pipes 50, 52, 60, and 62.

In the driven sprocket 12, fluid is supplied from the supply holes 46 and 48 to the injection holes 42 and 44, and is discharged from the injection holes 42 and 44. Driven sprocket 1
When the teeth 12a pass in front of the injection holes 42 and 44 with the rotation of 2, the fluid discharged from the injection holes 42 and 44 causes the mud, sand, pebbles, and the like attached to the teeth 12a to be blown off and removed. You.

In particular, the sprocket 12 has the teeth 12a and the teeth 1
Since there is a large U-shaped groove between 2a and
Mud, sand, pebbles, and the like easily enter this groove, and the mud, sand, pebbles, and the like that have entered are difficult to be naturally discharged. Injection hole 42,
By discharging the fluid from 44 toward the center of the sprocket 12, mud, sand, pebbles, and the like that have entered the groove are efficiently removed.

When the teeth 12a of the sprocket 12 pass through the grooves 34a, 36a of the scraper members 34, 36, mud, sand, pebbles, etc. attached to the side surfaces of the teeth 12a are scraped off by the scraper members 34, 36. . Since the teeth 12a from which mud, sand, pebbles, etc. have been removed pass through the grooves 34a, 36a, new adhesion is prevented during that time. In the same manner, the nozzle member 56,
58, the scraper member 54 removes mud, sand, pebbles, and the like.

Accordingly, it is possible to prevent mud, sand, pebbles and the like from being caught between the teeth 12a of the sprocket 12 and the chain 24, and the clogging increases the tension of the chain 24, thereby increasing the power loss and the chain 24. Damage, tooth 12a damage and the like can be prevented. As described above, the present invention is not limited to such embodiments at all, and can be implemented in various modes without departing from the gist of the present invention.

[0023]

As described in detail above, the underground excavator of the present invention removes mud, sand, pebbles, etc. attached to the sprocket by the fluid discharged from the injection holes, and thus removes mud, sand, pebbles, etc. The bite can be prevented from being bitten, and the tension of the chain is increased by biting, so that an increase in power loss, breakage of the chain, breakage of teeth, and the like can be prevented.

Further, by providing the scraper member, mud, sand, pebbles and the like adhering to the side surfaces of the teeth can be further removed. Further, by opening the injection hole radially and toward the center of the sprocket, mud, sand, pebbles, and the like can be efficiently removed from between the sprocket teeth.

[Brief description of the drawings]

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

FIG. 2 is a front view of the underground excavation tool of the embodiment.

FIG. 3 is an enlarged view of a sprocket on a driven side of the underground excavator of the embodiment.

FIG. 4 is a sectional view taken along the line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 6 ... Underground excavating tool 10, 12 ... Sprocket 12a ... Teeth 14 ... Excavating tool main body 24 ... Chain 26, 32 ... Excavating blade 28, 30 ... Rotating plate 34, 36, 54 ... Scraper member 34a, 36a ... grooves 38, 40, 56, 58 ... nozzle members 42, 44 ... injection holes

Claims (3)

(57) [Claims] 1. An underground excavator for excavating a chain by extending a chain between a pair of sprockets and driving a sprocket on a driving side to rotate a cutting blade through the chain to excavate the sprocket. An underground excavation tool provided with a nozzle member having an ejection hole for discharging a fluid toward the underground excavation tool. 2. The underground excavation according to claim 1, further comprising a scraper member that covers teeth of the sprocket that is not meshed with the chain and scrapes off soil attached to a side surface of the sprocket. Utensils. 3. The underground excavator according to claim 1, wherein the injection hole is opened in a radial direction of the sprocket and toward a center of the sprocket.