JPH0227091A - Method and device for vertical boring - Google Patents

Abstract

PURPOSE:To enhance the accuracy and safety by automatically measuring the excavating attitude of a casing pipe, on the basis of the data therefrom, giving necessary correction into the design excavation direction, and thus performing excavation. CONSTITUTION:The leader 5 of a specified heavy machine 4 is joined with a casing pipe 6 as addition so as to make penetration into the ground 2, and excavation is performed with static pressure using a winch 7 non-rotarily. A longitudinal boring device 10 is furnished at the lower tip of the pipe 6, and the tip is fitted with a specified crown bit, etc., and coupling is made with a drive device 12 using oil pressure or water pressure. This is connected with a control device 14, and the drive device 12 is equipped in its upper part with a laser beam device 15 and a cloth screen 16 to constitute an excavating attitude/direction sensing device, which allows direct monitoring of misalignment of the pipe 6 due to ocular excavation of transit 19. This enhances reliability of the execution of works.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is used to drill a casing pipe for chemical injection into the ground to form a borehole in ground improvement work, etc., and to drill the borehole in a straight line according to the design. , or belongs to the technical field of drilling into a bent state.

<Summary of the gist> The invention of this application is a process of vertically excavating a casing pipe in a predetermined ground for ground improvement etc., and the invention is a process in which a casing pipe is excavated vertically in a predetermined ground for ground improvement etc. This invention relates to a vertical boring method in which drilling is continued while drilling, and a device directly used in the method. The posture of the casing pipe is detected by the excavation direction measuring device installed inside the casing pipe, the posture of the casing pipe is measured by a monitoring device, and the posture of the gauging pipe relative to the drilling hole is corrected by the correction device attached to the casing pipe. This invention relates to a vertical boring method and device in which a pipe is oriented for excavation.

<Prior art> As is well known, in the mining industry, boring into rock is performed with extremely high accuracy, but the accuracy of boring during civil engineering work, such as improving soft ground, is not as accurate. For example, generally 1/
About 100, and even in the case of high precision 1/200
It was moderate.

However, recently, high-precision small rings are required for the construction of LNG tanks, deep subways, underground structures, etc., and the conventional boring for depths of about 10 m or 207 m is no longer possible. Yes, the above level is 10
In order to obtain highly accurate drilling at deep depths exceeding 0 m, conventional low-precision drilling is not satisfactory due to interference with adjacent drilling holes and interference with other existing underground structures. There was a risk that it would become something impossible.

Additionally, jet grouting and strainer work using boring are generally extremely expensive per unit, and therefore there is a disadvantage that there is a significant difference in reliability and cost between high-precision work and low-precision work. Furthermore, the high precision required in terms of safety and the like has some drawbacks that cannot be overcome with conventional boring methods.

To deal with this, in conventional methods, when drilling a hole with a casing pipe, the drilling is interrupted at a predetermined cycle and timing, the misalignment of the casing pipe is measured by soil and water surveying, and the vertical direction is corrected, and then the drilling is restarted again. This method involves continuing excavation, which has the disadvantage of being extremely inefficient, and also has the disadvantage of poor safety and accuracy due to interruptions in construction.

<Object of the Invention> The object of the invention of this application is to solve the problem of performing longitudinal boring by excavating a casing pipe, which requires high precision in civil engineering work when constructing deep structures such as LNG tanks based on the above-mentioned prior art. This is a technical problem to be solved, and when drilling a hole using a casing pipe, we will continue to measure and monitor whether or not the drilling direction is exactly as designed, and automatically move the vertical direction as designed. It is an object of the present invention to provide an excellent longitudinal boring method and apparatus that can be used in the field of civil engineering applications in the construction industry by allowing construction to be carried out while making modifications so that directional drilling can be carried out.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of the invention of this application, which is summarized in the above-mentioned claims, is that in order to solve the problem (e), deep ground improvement, etc. When carrying out this process, the casing pipe is excavated using a bit at the tip of the casing pipe using a designated heavy machine in order to form a hole by excavating the casing pipe. A device detects misalignment of the casing pipe during excavation, a monitoring device installed on the ground measures the excavation state, and the measurement data is used to check whether or not excavation is being performed as set, and the specified detection direction is determined. A technical measure was taken to operate the actuator of the correction device installed near the drilling bit to force the casing pipe to move straight or bend so that vertical drilling was performed as designed. It is something that

<Example> Next, an example of the invention of this application will be described as follows with reference to the drawings.

In the embodiment shown in FIG.
Ground 2 to improve the ground prior to constructing the G underground tank.
A casing pipe 6 is connected to a leader 5 of a predetermined heavy equipment 4 through a joint to a predetermined unit 1 to form a deep hole 3 in the ground.
The brackets 1 to 9 are attached so as to penetrate therein, and are suspended by a winch 7 of a heavy machine 4 via a gear 8, so that the brackets 1 to 9 continuously perform non-rotating excavation through static pressure. A vertical boring device 10, which is central to one of the gist of the invention of this application, is provided at the lower end of the casing pipe 6, and an excavation portion 11 for the ground 2 is provided at the tip of the device, unlike the conventional method. Similarly, the predetermined crown pitch 1
.

The drive unit @12 is connected to a predetermined control device 14 on the ground via a drive cable 13.

In the excavation section 11 in the casing pipe 6, a laser beam generator 15 as a detection device for the longitudinal direction of excavation is installed above the drive device 12 via a cross screen 16 at the bottom of the drive device 12. 1Y is a reflection mirror 18 provided at the upper end of the casing pipe 6
The reflected light is visually observed by a transit 19 serving as a monitoring device, so that the misalignment of the casing pipe 6 due to excavation can be directly monitored during excavation.

A predetermined number of ladders 22 as correction devices are provided at the upper part of the drive device 12 in the lower part of the casing pipe 6 from the slit 6' of the casing pipe 6 to the drilled wall through pins 21. The shoe 23 is provided so as to be able to freely rotate from the sleeve (-6') and to be able to come into contact with and separate from the wall surface of the drilled hole 3, and a hydraulic cylinder 24 as an actuator is provided on the inner surface of the casing pipe 6. The rod 25 allows the rudder 22 to pivot about the pin 21, and the hydraulic cylinder 24 is connected to the control device 14 by a cable hose 23.

In the construction equipment 1 described above, the heavy equipment 4 is transported to a predetermined improvement area, the casing pipe 6 is set in a predetermined position along the leader 5, static pressure is applied by the winch 7, and the control device 1
4, the drilling bit 11 of the drilling section is operated via the drive device @12 to drill the hole 3 in the vertical direction.

Then, the laser beam device 15 is operated, the beam 17 is reflected by the total reflection mirror 18, and the laser beam 17 is constantly visually observed through the cross screen 16 by the transit 19, and the laser beam 17 is reflected by the total reflection mirror 18.
Monitor misalignment.

Then, as shown in FIG. 5, the transit 19 measures the change in the excavation posture of the casing pipe 6 during excavation due to the misalignment of the light emitting source of the laser beam device 15 using the laser beam 17, and the control device 14 is controlled by the operating mechanism 20. The hydraulic cylinder 24 as an actuator is actuated via the hydraulic cylinder 24, and the shoe 23 of the ladder 22 in the setting direction is turned around the pin 21 to press and separate the shoe 1-23 from the inner wall of the drilled hole 3 in the setting direction. As shown in FIG. 6, the casing pipe 6 continues the excavation while correcting the misalignment by controlling the bending of the excavation in the vertical direction through elastic deflection in the longitudinal direction, while the laser beam 17 Changes in posture are measured through monitoring by the transit 19, and excavation is carried out while constantly correcting the vertical posture of the casing pipe 6.

In this way, the vertical drilling hole 3 is excavated by vertical excavation of the casing pipe 6 according to the design of the casing pipe 6 by the heavy equipment 4.

After excavation to a predetermined depth has been performed, the casing pipe 6 is pulled up while grouting etc. are performed as in the conventional method, and the heavy equipment 4 is moved to the next step to perform the next stage of drilling.

By doing so, it is possible to accurately drill a set number of holes 3 at a predetermined pitch, and to prevent mutual interference between adjacent drill holes 3.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments. In the case of conducting an attitude detection device, instead of the above-mentioned optical detection, a method such as an oscilloscope, a compass, a hanging pendulum, etc. can be used to extract the detection signal electrically and measure it on the ground for automatic monitoring. Various methods can be adopted, such as measuring and monitoring using a television camera and automatically operating the actuator of the correction device.

It goes without saying that it can be applied not only to civil engineering works such as soft ground improvement and foundation pile construction, but also to mining.

<Effects of the Invention> As described above, according to the invention of this application, when drilling a vertical hole in civil engineering work where a deep hole exceeding 100Tn is excavated, a drilling bit can be attached to the tip. When excavating by penetrating the casing pipe into the ground, it is possible to continue drilling in the vertical direction while constantly adjusting the posture during excavation, so that the vertical hole is always excavated as planned in straight or bent excavation. In addition, it has the excellent effect of being able to perform vertical excavation as designed.

Therefore, vertical drilling, which is extremely expensive per hole, can be performed with high accuracy and at low cost with good yield, and the reliability of construction is also significantly improved and safety is also high.

When excavating a casing pipe, the excavation posture of the excavated portion of the casing pipe can be automatically measured and excavation can be carried out while monitoring the posture. Therefore, excavation with the casing pipe can be carried out continuously, instead of intermittent excavation as in the conventional method. This has the effect of significantly improving construction efficiency and improving construction accuracy.

In addition, the vertical excavation posture of the casing pipe can be monitored by measurement using the posture detection device installed inside the casing pipe, and the casing pipe can be corrected to the correct vertical direction as designed by operating the actuator of the posture correction device in a specified manner. This effect is produced.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of the invention of this application, and the drawing is a first embodiment of the invention of this application.
The figure is a partial cross-sectional schematic side view of the excavation, Figure 2 is a schematic side view of the excavation, Figure 3.4 is a partial cross-sectional side view of the operation of the correction device, Figure 5 is a cross-sectional plan view of the same, and Figure 6 is a side view of the excavation. FIG. 6 is a schematic side view of the casing pipe with its posture corrected. 6...Casing pipe,

Claims (6)

[Claims] (1) In the vertical boring method, in which the ground is excavated vertically with a casing pipe, the excavation direction is corrected and the excavation continues, and the excavation posture of the excavated part of the casing pipe is automatically measured and the measurement data is A longitudinal boring method characterized in that the design excavation direction is modified and excavated. (2) Claim 1 characterized in that the measurement data is obtained as misalignment of the casing pipe.
Longitudinal boring method as described in section. (3) The longitudinal boring method according to claim 1, wherein the detection of the excavation posture is performed by a device provided on the casing pipe. (4) The longitudinal boring method according to claim 1, wherein the correction of the excavation direction is performed by a correction device provided on the casing pipe. (5) In a vertical boring device that continues to excavate while correcting the direction of excavation in the process of vertically excavating the ground with a casing pipe, a drive device is connected to the tip bit of the casing pipe and a hole is drilled. 1. A vertical boring machine, characterized in that a correction device that can be pressed and separated from a wall is provided with an actuator, and a posture detection device is installed inside the device. (6) In a vertical boring device that continues to excavate while correcting the direction of excavation in the process of vertically excavating the ground with a casing pipe, a drive device is connected to the tip bit of the casing pipe, and a hole is drilled. A correction device that can be pressed and released from the wall is provided with an actuator, and a posture detection device is installed inside the wall, and the actuator is linked to a control device connected to a monitoring device for the posture detection device. A vertical boring device featuring: