JPH0460092A - Drilling method of hole for earth construction and device thereof - Google Patents

Abstract

PURPOSE:To judge the feasibility of excavation and safely perform excavation by removing a pin to extract a screw shaft while a casing tube is left in the ground, and confirming a buried object in the ground at its tip when drilling a hole for earth construction. CONSTITUTION:A casing tube 7 is erected and a screw shaft l is rotated while the casing tube 7 is connected to the pressing member 12 of the screw shaft l with a pin 11, a pump 13 is driven, and high-pressure water is fed and sprayed through an injection nozzle 3. The injection nozzle 3 is rotated at the screw tip to change the buried soil 19a into slurry, which is discharged into a retention tank 16 via a scraping drain pipe 6a by rotary vanes 5. When the tip of the casing tube 7 hits an obstacle 18, an engine 2 and the pump 13 are stopped, the pin 11 is removed, the screw shaft l is extracted, it is visually confirmed after the slurry is removed, then excavation is continued.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a grounding hole suitable for excavating a grounding hole in an urban area with multiple layers of buried objects without damaging the buried objects. This invention relates to an excavation method and device.

[Prior art] An earth auger drill is usually used to drill holes for earth construction, or in urban areas where buried objects such as gas pipes, water pipes, and various cables are laid in a complicated manner, drilling with this earth auger drill is often used. Since there is a risk of damaging buried objects in the hole, the current practice is to proceed with excavation work while searching for buried objects by hand.

[Problem to be solved by the invention] However, since the earth construction hole is required to have a depth of around 2 meters, manual digging would require nine trenches, which would require a large excavation space, and the excavated soil would be too large. It is necessary to secure a certain amount of space around the borehole as it will come out in large quantities. In addition, if you hit a buried object during excavation, you will have to change the excavation location and start digging again, making the previous work a waste of time. It would require a tremendous amount of effort to remove and repair it.

Therefore, in order to eliminate the labor and effort involved in manual excavation, it is necessary to develop a method for excavating buried objects without damaging them by mechanical excavation.

The present invention has been made in view of the above circumstances, and aims to provide a means for safely and easily excavating holes for grounding in urban areas with multiple layers of buried objects without damaging the buried objects. purpose.

[Means for Solving the Problems] The above object of the present invention is to connect a hollow screw shaft 1 with swirl vanes 5 which is rotated by an engine 2 and a casing tube 7 rotatably housing the screw shaft. 11, and as the screw shaft 1 is driven to rotate, high-pressure water flows through the hollow of the screw shaft and is ejected into the soil through the injection nozzle 3 at the tip of the screw shaft. Excavated soil softened by the ejection is sent upward into the casing tube 7 by the swirling vane 5 of the screw shaft 1, and is discharged outward through the drain pipe connection port 6 at the upper end of the screw shaft. When the tip of the casing tube 7 hits a buried object in the soil, the pin 11 is disengaged, the screw shaft 1 is pulled out of the casing tube 7, and the screw shaft 1 is pulled out through the inner cavity of the casing tube.
A method for drilling a hole for ground construction, characterized in that obstacles at the tip can be visually confirmed, and a hole is connected to a rotating shaft 2a that is rotated by the rotational drive of an engine 2, and the tip is inclined outward. A hollow-shaped spray nozzle 3 is provided with an angular injection nozzle 3, a high-pressure water inlet hole 4 is provided near the connecting portion of the rotating shaft 2a, and a swirling blade 5 is provided from the tip end to the vicinity of the high-pressure water inlet hole 4. A screw shaft l is rotatably housed in a casing tube 7 having a drain pipe connection port 6 on the side of the upper end, and the engine 2 and the casing tube 7 are connected to each other.
A relay box 9 is provided with a pressure feed pipe connection port 8 which allows the screw shaft to rotatably surround the high-pressure water inflow hole 4 of the screw shaft L, and a relay box 9 is provided with the upper end of the casing tube 7 in its lower part. This problem can be solved by a drilling device for drilling holes for grounding, which is characterized by fixing a presser member 12 that can be attached and detached by fitting the pin 11 together.

[Function] With the above means, the casing tube 7 and the screw shaft 1 can be attached and detached by removing the pin 11.

To excavate underground, the casing tube 7 is connected to the holding member 12 of the screw shaft 1 with the pin 11 and placed in the soil at a predetermined position, and the screw shaft 1 is rotated and high pressure water is supplied. The water enters the relay box 9 through the pressure feed pipe connection port 8, passes through the high-pressure water inlet 4 of the screw shaft 1, passes through the inner cavity of the screw shaft 1, and is ejected from the injection nozzle 3 at the tip of the screw shaft 1. Since the injection nozzle 3 is inclined outward at the tip of the screw shaft 1,
The injection nozzle 3 turns the earth and sand around the tip of the casing tube 7 into muddy water by the injection force of high-pressure water as the screw shaft 1 rotates. This muddy earth and sand rises inside the casing tube 7 while being scraped up by the swirling blades 5 of the screw shaft 1, and is discharged through the drain pipe connection port 6 at the upper end of the screw shaft 1.

If the casing tube 7 is blocked from entering during such excavation work, the engine 2 and high-pressure water supply are stopped, the pin 11 that fixes the casing tube 7 is released from the joint, and the screw shaft l is inserted into the casing tube 7. When the muddy water in the inner cavity of the casing tube 7 is removed, the inner cavity is opened, so that the condition of the obstruction at the tip of the casing tube 7 can be visually confirmed through the inner cavity of the casing tube.

[Example 1 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional schematic diagram of an embodiment of the earthing hole drilling device of the present invention, FIG. 2 is a diagram showing an example of use of the drilling device shown in FIG. 1, and FIG. ) is a diagram showing the state of underground excavation.

In FIG. 1, reference numeral 2 denotes a driving engine, a rotating shaft 2a of which is connected to a screw shaft 1, and the screw shaft 1 is rotatably housed in a casing tube 7.

An injection nozzle 3 having a constant inclination angle toward the outside is provided at the tip of the screw shaft 1, and a high-pressure water supply pump 1 shown in FIG.
3, a high-pressure water inflow hole 4 is provided through which high-pressure water flows into the inner cavity of the screw shaft 1 via a pressure feed pipe 8a. In addition, from the tip of the screw shaft 1 to the vicinity of the high-pressure water inflow hole 4,
That is, with the screw shaft 1 housed in the casing tube 7, the swirl vanes 5 are provided in a range extending substantially over the entire length of the casing tube 7.

A relay box 9 is provided between the engine 2 and the casing tube 7, and is provided with a pressure feed pipe connection port 8 that hermetically surrounds the high-pressure water inlet hole 4 of the screw shaft 1. The presser member 12, which is fitted and made detachable by connecting the pin 11, is missing. Therefore, although the screw shaft 1 passes through the relay box 9 and the presser member 12, there is a seal 9 on the contact surface with the relay box 9.
a is provided, and a bearing 12a is provided at the contact portion with the screw shaft 1 to ensure rotation of the screw shaft 1 and sealing performance.

The casing tube 7 is formed of a steel pipe and has a drain pipe connection port 6 on the side of its upper end, and the upper open portion of the casing tube 7 is closed by the presser member 12.

With such a device, the casing tube 7 and the screw shaft l can be attached and detached by removing the pin 11. However, the screw shaft 1 is inside the casing tube 7.
In order to accommodate this, the tip of the injection nozzle 3 should not protrude beyond the tip of the casing tube 7.

When excavating underground with such excavation equipment,
A pressure feed pipe 8a connected to the high-pressure water supply pump 13 is connected to the pressure feed pipe connection port 8 of the relay box 9, and a drain pipe 6a is connected to the drain pipe connection port 6 of the casing tube 7.
The tip of the drain pipe 6a is arranged above the retention tank 16.

Then, while the casing tube 7 is connected to the holding member 12 of the screw shaft l with the pin 11, as shown in FIG. Stand the casing tube 7 on the
The screw shaft 1 is rotated and the pump 13 is driven to supply high pressure water. High-pressure water from the pump 13 enters the relay box 9 via the pressure-feeding pipe 8a and the pressure-feeding pipe connection port 8, passes through the internal cavity of the screw shaft 1 from the high-pressure water inlet hole 4 at the top of the screw shaft 1, and flows through the internal cavity of the screw shaft 1. It is ejected from the injection nozzle 3 at the tip.

Since the injection nozzle 3 is inclined outward at a certain angle at the tip of the screw shaft 1, the injection nozzle 3 does not rotate at the tip of the screw, and the buried ±19a around the tip of the casing tube 7 is softened by the injection force of high-pressure water and turned into muddy water. do. This muddy earth and sand rises inside the casing tube 7 while being scraped up by the swirling blades 5 of the screw shaft 1, and passes through the drain pipe 6a through the drain pipe connection port 6 at the upper end of the screw shaft 1.
It is discharged into the retention tank 16 through the process.

As shown in FIG. 2, if the muddy water discharged into the retention tank 16 is filtered to some extent and then pumped up again to the pump 13, high-pressure water can be reused and the water supply can be saved.

During such excavation work, if the tip of the casing tube 7 hits an obstacle 18 in the soil and is blocked from entering, the engine 2 and pump 13 are stopped and the casing tube 7 is removed. When the fixed pin 11 is removed and the screw shaft 1 is pulled out from the casing tube 7 to remove the muddy water in the lumen of the casing tube 7, the lumen is opened, and as shown in FIG. Casing tube 7 through the cavity
Visually check the condition of the obstruction at the tip using an endoscope 17 or the like. At this time, if the obstacle 18 is a buried pipe or the like, the excavation is stopped, the excavation hole 19 is filled in as shown in Fig. 3fcl, and the target hole 20 is excavated at a different location using the same method as above. Do it with Further, when the obstacle is a pebble or the like, the excavation continues as is, and the pebble and the like are scraped up and discharged together with the buried surface by the swirling blade 5.

[Effect of the invention 1] As described above, according to the method and device for excavating a grounding hole of the present invention, the casing tube remains in the soil during excavation, and can be easily integrated with the engine by removing the pin. Since the screw shaft can be pulled out without removing the screw shaft, it is possible to visually check the existence and status of buried objects in the soil at the tip of the casing tube using the inner cavity of the casing tube, and as a result, it is possible to determine whether to continue digging or to stop digging. can be judged.

Therefore, the present invention makes it possible to safely and easily excavate a hole for grounding, especially in an urban area with multiple layers of buried objects, without damaging the buried objects.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional schematic diagram of an embodiment of the earthing hole drilling equipment of the present invention, Fig. 2 is a diagram showing an example of use of the drilling equipment shown in Fig. 1, and Figs. 3 fa) to fc). is a diagram showing the state of excavation in the soil. DESCRIPTION OF SYMBOLS 1... Screw shaft, 2... Engine, 3... Injection nozzle, 4... High pressure water inflow hole, 5... Swivel vane,
6... Drain pipe connection port, 7... Casing tube, 8... Pressure feed pipe connection port, 9... Relay box, 11.
...Pin, 12...Press member. Figure 1

Claims (2)

[Claims] (1) A hollow screw shaft 1 with swirl vanes 5 rotated by the engine 2 and a casing tube 7 rotatably housing the screw shaft are removably connected by a pin 11, and the screw shaft 1 is Along with the rotational drive, high-pressure water flows through the hollow of the screw shaft and is ejected into the soil through the injection nozzle 3 at the tip of the screw shaft, and the excavated soil softened by the ejection of the high-pressure water is transferred to the screw shaft 1. When the tip of the casing tube 7 hits a buried object in the soil during excavation, it is sent upward into the casing tube 7 by the swirling vane 5 of the screw shaft and discharged outward through the drain pipe connection port 6 at the upper end of the screw shaft. , the earthing construction is characterized in that the screw shaft 1 is removed from the casing tube 7 by separating the pin 11 from the joint, and passing through the inner cavity of the casing tube so that it is possible to visually check for obstacles at the tip of the casing tube 7. How to drill holes. (2) Rotating shaft 2 rotated by the rotational drive of the engine 2
a, the tip thereof is provided with an injection nozzle 3 having an outwardly inclined angle, and a high-pressure water inflow hole 4 is provided near the connection portion of the rotating shaft 2a, and the high-pressure water inflow hole is connected to the tip portion. A hollow screw shaft 1 equipped with swirl vanes 5 up to around 4 is rotatably housed in a casing tube 7 having a drain pipe connection port 6 on the side of the upper end, and the engine 2 and the casing tube 7 are connected to each other. In between is a relay box 9 equipped with a pressure feed pipe connection port 8 that rotatably surrounds the high-pressure water inflow hole 4 of the screw shaft 1, and the upper end of the casing tube 7 is accommodated in the lower part of the relay box 9. A drilling device for drilling holes for grounding, characterized in that a presser member 12 is fixed to the holding member 12, which can be attached and detached by connecting a pin 11.