JP6971763B2 - Horizontal boring method and equipment - Google Patents

Description

The present invention relates to a horizontal boring method and an apparatus, and more particularly to a technique of excavating a self-supporting (hard rock or the like) ground by a percussion single reverse method to collect a core.

The percussion wire line method is conventionally known as this type of boring method. This method is to construct all the ground from hard rock to soft ground without changing the boring machine itself. As shown in Fig. 12, water is sent from inside the rotating inner pipe, and the inner pipe and core tube are narrow. While it is ejected from the clearance to the tip of the core bit as rock drilling water, the ejected water is reversed between the inner pipe and the outer pipe. Then, the core obtained by excavation is captured by the core tube and collected.

However, with this method, it was sometimes impossible to dig when back pressure from the ground was applied due to a large amount of spring water. The reason is that when collecting the core tube, if the overshot for collecting the core tube docks with the core tube, the latch will be dented and at the same time the core tube and overshot will be pushed by high water pressure and a large amount of spring water at once. It is considered that it is very dangerous because it pops out, and that the core tube cannot be pushed in by the spring water pressure in the next step. Therefore, there is a problem that the tunnel excavation is interrupted without excavating a predetermined length, and as a result, the tunnel excavation cannot construct a predetermined extension, the setup change is repeated many times, and the cost is increased and the construction period is extended.

In view of the above, there is a double pipe reverse method as a countermeasure for earth and sand. This construction method is a rotary type that has an inner pipe and an outer pipe, and both pipes rotate. It is a method that can make progress as there is high pressure and a large amount of spring water. As shown in FIG. 13, the rotating inner pipe and outer pipe Water is sent from between, passes through the tip of the core bit, and the inside of the inner pipe is reversed. Then, the core obtained by excavating with the core bit at the tip is recovered together with reverse water or the like. Patent Document 1 is a prior art document.

However, although this method is a very effective method for earth and sand countermeasures, the boring machine becomes large because the double pipe is rotated without hitting when excavating. When encountering hard rock, it is a construction method that is difficult to excavate or takes a very long time, and there is a problem that the construction is very expensive and expensive.

Japanese Patent No. 5876378

Therefore, the present invention solves the problem of the conventional technique and can cope with a large amount of spring water generated in an independent ground without using a large double pipe reverse method machine. By using a small machine of the percussion wire line method, it can be constructed by feeding, striking and rotating the inner rod consisting of a single pipe, and it is a horizontal boring method that is cheaper and more versatile than the conventional method. And to provide the device.

In order to solve the above-mentioned problems, the invention according to claim 1 relates to a horizontal boring method, in which an inner rod is inserted into a mouth pipe installed in a self-supporting ground hole wall via ground coking. While sending water from the mouth pipe side between this inner rod and the ground, excavate with the core bit attached to the tip of the inner rod by feeding, hitting and rotating the inner rod by the boring machine, and reverse the core scraped by this excavation. It is characterized in that the inside of the inner rod is sent to the base end side of the inner rod by water and spring water pressure and collected.

According to the second aspect of the present invention, in the first aspect, the core is collected from the base end opening of the inner rod. According to the third aspect of the present invention, in the first aspect, the core is recovered from the opening formed in the peripheral wall on the base end side of the inner rod.

According to claim 4, the invention according to claim 4 is closed by a closing means so that the opening and the base end opening of the inner rod do not communicate with each other.

The invention according to claim 5 relates to a horizontal boring device, and is a mouth pipe installed on a self-supporting ground mouth hole wall via ground coking, and protrudes outward from the mouth hole wall of this mouth pipe. A prepender device installed by connecting to the base end of the inner rod, an inner rod installed by being pumped and rotatably inserted into the mouth pipe, and an inner rod installed by connecting to the base end of the inner rod. Equipped with a rod feeding machine and a boring machine for striking and rotary drive, a core bit is attached to the tip of the inner rod, a water blocking member that stops water between the inner rod and the mouth pipe in the prepender device, and water supply for drilling. A water supply valve connected to a pump to send water between the inner rod and the mouth pipe is provided , and water from the water supply valve passes between the inner circumference of the mouth pipe and the outer circumference of the inner rod, and then joins the inner rod. It is characterized by being sent to and from the ground.

The invention according to claim 6 is installed in claim 5 in which the outer rod is inserted deeper than the mouth tube at the tip between the inner circumference of the mouth tube and the outer circumference of the inner rod.

According to a seventh aspect of the present invention, in claim 5 or 6, a core sampling mechanism is installed around an inner rod between the prepender device and the bowling machine.

According to a seventh aspect of the present invention, in claim 7, the core sampling mechanism is such that an opening formed by a notch in the peripheral wall on the base end side of the inner rod does not communicate with the opening and the base end opening of the inner rod. It has a closing means for closing and a core receiving device installed below the opening.

According to a ninth aspect of the present invention, in the eighth aspect, the core receiving device has a separation mechanism for separating the core and slime collected from the opening.

The invention according to claim 10 is the reverse water scattering prevention which prevents the reverse water discharged from the opening from scattering around the inner rod between the prepender device and the bowling machine in claim 8 or 9. The device is installed.

The present invention is as described above, and according to the invention of claim 1, an inner rod is inserted into a mouth pipe installed in a mouth hole wall of a self-supporting ground through a ground coking, and the inner rod is inserted into the mouth pipe. While sending water from the mouth pipe side between the inner rod and the ground, excavate with the core bit attached to the tip of the inner rod by feeding, striking and rotating the inner rod by the boring machine, and reverse water the core scraped by this excavation. Because the inside of the inner rod is sent to the base end side of the inner rod and collected by the spring water pressure, if there is a large amount of spring water or high pressure spring water as in the past, the water supply and the spring water collide with each other and show complicated movements. There is a danger that the core tube and wire will pop out, and there is no interruption of construction that cannot be inserted when the core tube is inserted again, so the construction period can be shortened and the cost can be reduced. In addition, since the construction is done only with the inner rod consisting of a single pipe instead of the double pipe as in the past, the boring machine can be the same machine as the percussion wire line construction method, and the construction cost is cheaper than the conventional construction method. It has the excellent effect of being versatile as well as being able to do so.

According to the inventions of claims 2 to 4, the core can be effectively recovered from the base end side of the inner rod via the inside of the inner rod.

According to the inventions of claims 5 and 6, it is possible to provide an apparatus capable of carrying out a horizontal boring method.

According to the invention of claim 7, the core can be collected not from the base end opening of the inner rod but also from the periphery of the inner rod between the prepender device and the bowling machine, so that the core can be easily collected. Become. According to the eighth aspect of the present invention, the core can be reliably collected from the opening provided in the peripheral wall on the base end side of the inner rod, and received and collected by the core receiving device below the opening. According to the invention of claim 9, the recovered core and slime can be effectively separated by a separation mechanism.

According to the tenth aspect of the present invention, it is possible to effectively prevent the reverse water returned from the inner rod together with a large amount of spring water from being scattered from the opening to the outside by the reverse water scattering prevention device.

It is an outline normal sectional view of the whole for demonstrating the 1st Embodiment of the horizontal boring method which concerns on this invention. It is an outline normal sectional view of the whole for demonstrating the 2nd Embodiment. It is an enlarged view of the part A of FIG. It is an enlarged view which partially broke the inner rod. It is the B part enlarged view of FIG. It is an enlarged view of part C of FIG. It is a partially enlarged view near the opening which shows the core sampling mechanism. It is a partially enlarged view which shows the example using the same core catcher. A hanging type core receiving device is shown, (A) is a front view, and (B) is a side view. A ground-mounted core receiving device is shown, (A) is a front view, and (B) is a side view. It is a drawing explaining the slime discharge function of a core catcher. It is a drawing explaining the conventional percussion wire line construction method. It is a drawing explaining the conventional double pipe reverse construction method.

<First Embodiment>
The first embodiment shows the basic configuration of the horizontal boring method and the apparatus according to the present invention, and an overall view thereof is shown in FIG. In FIG. 1, reference numeral 1 denotes a boring device used when carrying out a construction method, which has the following configuration. That is, it is connected to the mouth pipe 3 installed on the mouth hole wall drilled in the independent ground A via the ground caulking 2 and the base end portion of the mouth pipe protruding outward from the mouth hole wall. The prepender device 4 is provided with an inner rod 6 which is inserted into the mouth pipe so as to be fed (moved), hit and rotatably. The ground caulking 2 seals the ground A and the mouth pipe 3, and is fitted to the mouth hole wall before the mouth pipe 3 is installed. After the installation, the mouth pipe 3 is attached to the ground caulking 2. It is designed to be inserted and installed.

The mouth pipe 3 is a hollow pipe having both ends opened to stably support the inner rod 6, and its length is slightly longer than that of the ground caulking 2. Like the mouth pipe 3, the inner rod 6 is composed of hollow pipes having openings at both ends and continues to the excavation tip. A core bit 7 is attached to the tip of the inner rod 6. The prepender device 4 has a pipe body 4a, and the pipe body is provided with a water stop member 8 for stopping water between the inner rod 6 and the mouth pipe 3, a water supply valve 9 connected to a water supply pump (not shown), and the like. There is. The water stop member 8 is composed of a plurality of water stop packings 10, and is configured to position the packing with a stopper and then press the packing with a pipe cap 4b attached to the pipe body to stop water. Although not shown, a boring machine (drifter) for feeding / rotating the inner rod 6 is connected and installed at the base end of the inner rod 6 protruding outward from the prepender device 4.

In the above-mentioned boring device 1, in order to collect the core from the ground, the inner rod 6 is fed, impacted, and rotationally driven by the drifter. By this drive, the inner rod 6 rotates while advancing toward the face side, and excavates by the impact / rotation action of the core bit 7 at the tip. At the same time, the water supply valve 9 provided in the prepender device 4 is opened, and water from the water supply pump for drilling is sent between the inner rod 6 and the mouth pipe 3 and between the inner rod 6 and the ground A to reach the face. Send to a certain tip side. Then, the water supply is reversed to the prepender device 4 side as shown by the arrow together with the core B scraped off as reverse water together with the spring water through the core bit 7 at the tip of the inner rod 6. Then, the core B is taken out and collected by discharging from the base end opening of the inner rod 6.

In the above, the core B itself is collected, but it may be collected after being caught by a core catcher described later corresponding to the core tube.

In this way, since the water supply for core recovery is performed from between the inner rod 6 and the ground A, not from inside the inner pipe or between the inner pipe and the outer pipe as in the past, a large amount of spring water and high-pressure spring water are used. Even if there is, the reverse water is integrated with the spring water and pushes out the core while maintaining the water supply, so dangerous work such as the core tube and wires popping out is eliminated, and the core tube is not sent again, so percussion. -Compared to the wire line construction method, there is no interruption of construction, so the construction period can be shortened and the cost can be reduced. Also, instead of rotating like the conventional double pipe reverse method, it is sufficient to hit and rotate only the inner rod 6 made of a single pipe, so use the same machine as the percussion wire line method for the boring machine. And the construction cost can be reduced.

<Second embodiment>
As shown in the overall view in FIG. 2, the boring device 21 used in carrying out the construction method in the second embodiment has the following configuration. That is, the mouth pipe 23 installed through the ground coking 22 in the mouth hole wall drilled in the independent ground A, and the outer rod 25 installed by excavating and inserting the tip portion deeper than the mouth pipe 23 into this mouth pipe. An inner rod 26 installed by being fed, impacted, and rotatably inserted into the outer rod, and a prepender device installed by connecting to a base end portion protruding outward from the mouth hole wall of the mouth pipe. 27, a connection pipe 28 installed by connecting the tip end to the base end portion of the mouth pipe 23 protruding outward from the prepender device by fitting, and a connection pipe 28 installed by connecting to the base end portion of this connection pipe. It is provided with a prepender device 30 and a drifter 31 as a boring machine installed connected to a base end portion of an inner rod 26 protruding outward from the prepender device.

The configurations of the ground caulking 22, the mouth pipe 23, the inner rod 26, and the like are substantially the same as those of the first embodiment. Like the inner rod 26, the outer rod 25 is composed of hollow pipes having openings at both ends, but the length thereof is limited to the portion where the ground does not stand on its own, and the length varies depending on the conditions of the ground. The outer rod 25 is arranged between the inner circumference of the mouth pipe 23 and the outer circumference of the inner rod 26, and plays a role of forming a water supply passage between the inner rod 26 and the middle of the excavation.

Next, the details of each part will be described with reference to FIGS. 3 and below.

As shown in FIG. 3, in the configuration of the front side (face side) of the bowling device 21, the core bit 33 is attached to the tip of the inner rod 26. The core bit 33 has an outer diameter of about 100 mm and an inner diameter of about 50 mm, and the core B scraped off by the core bit 33 is taken into the inner rod 26 from the tip opening. By reversing the water and spring water sent from between the mountains A toward the core bit 33 from the tip opening of the core bit 33 into the inner rod 26, the core B can be easily taken in. The inner rod 26 has an outer diameter of about 90 mm and an inner diameter of about 60 mm.

As shown in FIG. 4, a plurality of inner rods 26 having a predetermined length (about 1.5 m) are used, and these plurality of inner rods 26 are connected by a connecting portion 35 formed at the opposite end portion thereof. It is designed to be added. One of the opening ends 35a is formed in the insertion port and the other opening end portion 35b is formed in the receiving port, and the connecting portion 35 is connected by fitting the insertion opening and the receiving port. As a result, the inner diameter of the connecting portion 35 of the inner rod 26 is formed to be the same as the inner diameter of the inner rod 26 other than the connecting portion, and no step or the like is generated.

As shown in FIG. 5, the structure of the intermediate portion of the boring device 21 is such that the outer rod 25 is inserted into the inner circumference of the mouth tube 23 and the outer circumference of the inner rod 26 so that the inner rod 26 can be fed, hit and rotatably inserted. It is placed between and. The outer rod 25 has an outer diameter of about 130 mm and an inner diameter of about 100 mm. An annular gap formed by the difference in outer diameter between the outer diameter of the core bit 33 of about 100 mm and the outer diameter of the inner rod 26 of about 90 mm is formed in the water supply channel 37 extending in the axial direction of the inner rod 26. Further, the mouth tube 23 is set to have an outer diameter of about 160 mm and an inner diameter of about 150 mm. The outer rod 25 has the above-mentioned length, and its tip does not extend close to the core bit as in the outer pipe described in the prior art.

As shown in FIG. 6, the prepender devices 27 and 30 are installed in the rear (wellhead side) configuration of the boring device 21. More specifically, one end flange 41 of the prepender device 27 for the outer rod is fixed to the flange 40 on the base end side protruding from the ground A of the mouth pipe 23 by bolts and nuts. A ring-shaped water blocking member 42 that expands and contracts by pressurization is housed in a recess formed in a large diameter in the pipe body 27a on the other end side of the prepender device 27, and its inner peripheral edge is in contact with the outer peripheral surface of the outer rod 25. It can be separated. One end of the connecting pipe 28 is inserted and connected to the base end portion of the outer rod 25 protruding from the prepender device 27 without forming a step on the inner and outer circumferences, and the inner rod is connected to the other end flange 44 of the connecting pipe 28. One end flange 45 of the prepender device 30 for use is fixed by bolts and nuts. A ring-shaped water blocking member 46 that expands and contracts by pressurization is housed in a recess formed in a large diameter in the pipe body 30a on the other end side of the prepender device 30, and its inner peripheral edge is in contact with the outer peripheral surface of the inner rod 26. It can be separated.

Both the water blocking members 42 and 46 have the same structure, and are formed of, for example, a rubber material (hollow rubber tube) that expands and contracts by pressure. Pressurization is performed by, for example, a liquid (water). Hard rubber is preferable as the rubber material. The inner rod 26 protruding outward from the prepender device 30 extends by a predetermined length, and its base end portion is connected to the drifter 31 with a clutch or the like interposed therebetween.

A water supply valve 47 connected to a water pump for drilling is installed in the pipe body 30a of the prepender device 30, and the amount of water supplied can be adjusted by opening and closing the valve. Further, a pressure gauge 48 is installed at a position corresponding to the water supply valve 47 so that the water pressure in the prepender device 30 can be measured and the opening / closing control of the valve 47 can be performed. That is, the water supply valve 47 is normally in the fully open state, and the amount of water supply is adjusted by the water supply pump for drilling. Since the water pressure in the device 30 rises, in such a case, the pressure gauge 48 measures the water pressure at the mouth to give an instruction to stop boring or the like.

Generally, the prepender device stops the water on the drifter side so that the sent water goes to the face side, but the sent water often leaks. Therefore, in the prepender devices 27 and 30, various necessary improvement measures are taken in order to minimize the leakage and to make the device durable. The operation of the prepender devices 27 and 30 is one example thereof, and this will be described below.

In the prepender device 27, a gap is formed between the outer rod 25 and the outer rod 25 before the chuck, but after the outer rod 25 is operated and chucked, pressure is applied to the outer rod 25 to be housed in the tube body 27a of the prepender device 27. The water member 42 expands and swells, and presses and contacts the outer rod 25 without a gap. Therefore, the water is effectively stopped, the water does not leak from the mouth, and the water sent is efficiently sent to the face side. The same applies to the prepender device 30, and when it is operated and chucked, the water blocking member 46 presses against the inner rod 26 without a gap to prevent water leakage. As a result, its durability is also improved.

A core sampling mechanism 50, a spring water amount measuring mechanism 70, and a reverse water scattering prevention device 80 are installed around the inner rod 26 between the prepender device 30 and the drifter 31 as shown by a broken line in FIG. .. Each mechanism will be described below.

As shown in FIG. 2, the core sampling mechanism 50 is installed as a core rear (base end direction) outflow prevention device. That is, normally, the core captured by the core catcher (corresponding to the core tube) is discharged to the outside from the base end opening of the inner rod 26 and collected in the captured state. However, when the core B is directly recovered without using the core catcher, the core may be reversed with water together with the slime, which may be inconvenient for the recovery. Therefore, in such a case, instead of discharging from the base end opening, an opening 51 for core discharge is provided in the peripheral wall on the base end side of the inner rod 26 located in front of the base end opening by forming a notch. I try to discharge from.

As is clear from FIG. 6, the opening 51 cuts out the peripheral wall of the inner rod 26 along the central axis of the inner rod 26 by a predetermined length, and further, from one end and the other end of the cut out line, the tip direction and the base end. It is formed by notching diagonally downward in the direction in an open shape, and its length in the axial direction is set to about 0.25 m. This length is long enough to allow the cores that are collected and continuously sent to be discharged without any trouble.

However, as shown in FIG. 7, the sent core B cannot be discharged when the opening 51 is turned upward due to the rotation of the inner rod 26, and flows to the base end opening side (drifter side). It ends up. In order to prevent this, in this example, the opening 51 and the base end opening are closed by the outflow prevention plate 52. Even if the opening 51 is turned upward, the core B discharged by this is blocked by the outflow prevention plate 52 and does not flow to the base end opening side. When the core or the like blocked by the rotation of the inner rod 26 is turned downward, it falls from the opening 51 and is discharged. Then, the core discharged from the opening 51 is collected by the receiving device 53 described later. The shape of the opening 51 may be other than those shown in the figure as long as it has the same effect. Further, the outflow prevention plate 52 provided for blocking the core is only a preferable example as a closing means, and other means may be adopted.

The core receiving device 53 includes a hanging type and a ground-mounted type. As shown in FIG. 9, the suspension type receiving device 53A is provided by being suspended by a hook 55 having a length that can cover between the prepender device 30 and the clamp for the drifter 31. The core receiving device 53A is provided with a mesh-shaped core / slime receiving 60 on a receiving main body 57 supported by two supporting pieces 56 that incline downward from the lower end of the hook 55, and a core that falls during ejection. And the slime is received by the core / slime receiver 60, and only the slime is received by the receiving main body 57 through the mesh mesh, so that the core and the slime can be separated and collected. The receiving body 57 is formed in the shape of a gutter having a semi-circular cross section. Since the receiving main body 57 moves together with the inner rod 26 when the core is collected, it is connected to an immovable portion such as a clamp when digging the rod with a detachable rope 62 or the like. The width between the two support pieces 56 is about 0.3 m, and a reverse water splash prevention device 80 is detachably provided above the both ends so as to cover the hook 55. It is preferable that the core / slime receiver 60 is formed of a strong and light net or the like to collect only the core B, and the receiver body 57 is formed of a fine mesh wire mesh or the like to collect the core / slime.

As shown in FIG. 10, the ground-mounted receiving device 53B is formed by forming the legs of the core receiving device 53B into a rectangular frame 64 with a single tube or the like. A receiving body 65 and a core / slime receiving 66 are provided over the upper end tube of the frame 64 in the lateral direction. Other configurations and functions are the same as the hanging core holder.

By using any of the above receiving devices 53A and 53B, the core and slime discharged at the same time can be efficiently separated and recovered, and the recovery efficiency is higher than that of the conventional one which is manually separated. Will be higher.

As mentioned above, it is possible to use the core catcher 54 when collecting the core. However, when this core catcher is used, it is formed of a flexible mesh-like metal cylinder and has a minimum rigidity. It is preferable to provide a slit, a hole, a mesh or the like so that the slime can be discharged.

Therefore, as shown in FIGS. 11A to 11C, the core catcher 54 used here is provided with the following improvement measures as a slime discharging function. That is, in the conventional core catcher, as shown in FIG. 11D, holes drilled in the peripheral wall are provided with a hole diameter of Φ5 mm at intervals of 100 mm, but the core catcher 54 used in this embodiment is drilled in the peripheral wall. The holes are made large with a hole diameter of 10 to 15 mm (A), slitted with a length of 100 to 200 mm and a width of about 10 mm (B), or a durable mesh with a mesh of about 5 mm (C), etc. Is formed by. By using such a core catcher 54, slime can be discharged very well.

The reverse water splash prevention device 80 is provided above the core receiving devices 53A and 53B as shown in FIGS. 9B and 10B. That is, it has the width of the core receiving devices 53A and 53B, is formed by a hollow cover body 82 formed in an arch shape upward, and the cover body covers the opening 51 of the inner rod 26. .. The material of the cover body 82 may be any material and shape as long as it has sufficient rigidity to withstand reverse water scattering.

If such a scattering prevention device 80 is provided, even if there is a large amount of spring water and the reverse water discharged together with the core B from the opening 51 is ejected together with the spring water and is scattered to the surroundings, the said. The scattering of the scattered water can be effectively prevented by the cover body 82, and the situation where a person cannot approach the surroundings is avoided.

In order to collect the core B from the ground A in the above-mentioned device, first, the boring device 21 is installed. To explain the procedure, the first thing to do is to install the prepender device 27. That is, the mouth tube 23 is inserted into the ground caulking 22 fitted to the mouth hole wall, and one end flange 41 of the prepender device 27 for the outer rod is attached to the flange 40 protruding outward from the mouth hole wall of the mouth tube 23. Secure with bolts and nuts. After that, the connecting pipe 28 is connected by inserting one end thereof to the end portion of the outer rod 25 protruding outward from the prepender device 27, and the prepender device 30 for the inner rod is connected to the other end flange 44 of the connecting pipe. One end flange 45 is fixed with bolts and nuts. Next, after the outer rod 25 and the inner rod 26 are sequentially inserted into the prepender device 30 installed in this way, the end portion protruding outward from the inner rod prepender device 30 can be connected to the drifter 31 for boring. The installation work of the device 21 is completed.

After the boring device 21 is installed, the work of collecting the core B from the ground A is performed next. For this work, the inner rod 26 is fed, impacted, and rotationally driven by the drifter 31. By this drive, the inner rod 26 advances to the face side while striking and rotating, and is excavated by the core bit 33 at the tip. At the same time, when the water supply valve 47 provided in the prepender device 30 is opened, water from the water supply pump flows between the inner rod 26 and the connecting pipe 28 and between the inner rod 26 and the outer rod 25, and further, the inner rod 26 and the ground. It flows between mountains A and heads toward the tip with a face. Then, the water passes through the tip of the inner rod 26, and the core B scraped off as reverse water together with the spring water is reversed to the prepender devices 27 and 30 sides, discharged from the opening 51, and received and collected by the receiving device 53.

The core is recovered not from the base end opening of the inner rod 26 as described above, but from the opening 51 formed in the inner rod in front of the base end opening. That is, since the opening 51 is formed by cutting out the peripheral wall of the inner rod 26 and has a structure in which the base end opening is closed by the outflow prevention plate 52, the opening 51 is sent from the tip side of the inner rod 26. The core and reverse water are discharged downward from the opening 51 when the opening is turned downward due to the rotation of the inner rod 26, and are taken out. That is, even when the opening 51 is directed upward, the core or the like is blocked in the inner rod for a while, but is discharged downward when it is directed downward.

Also in this embodiment, since water for core recovery is sent from between the inner rod 26 and the connecting pipe 28, between the inner rod 26 and the outer rod 25, and further between the inner rod 26 and the ground A, a large amount of spring springs. Even if there is water or high-pressure spring water, the reverse water is integrated with the spring water to push out the core while maintaining the water supply, so dangerous work such as the core tube and wires popping out is eliminated, and the core tube should be sent again. Since there is no such thing, it does not become a dangerous work as in the past compared to the percussion wire line method. Moreover, since construction interruptions due to spring water pressure are eliminated, the construction period can be shortened and the cost can be kept low. Also, instead of rotating like the conventional double pipe reverse method, it is sufficient to hit and rotate only the inner rod 6 made of a single pipe, so use the same machine as the percussion wire line method for the boring machine. And the construction cost can be reduced.

As described above, according to the embodiment, the self-supporting ground A is hit and rotated by the single pipe method of the inner rod 26, and the core B is collected and collected, so that the progress is fast. The higher the pressure and the larger the amount of spring water, the better the progress. Then, the recovered core B is extruded by the reverse water and the spring water pressure, so that the efficiency is high.

It should be noted that the above embodiment is merely a preferable example, and it goes without saying that the design of the present invention can be arbitrarily changed or modified as long as it is within the scope of the claims. For example, the mouth pipe, inner rod, outer rod, connecting pipe, prepender device and the like shown in the above embodiment may be designed other than those shown in the figure, and a specific design of the core receiving device and the reverse water splash prevention device may be used. May be other than those described in the illustration.

1,21 Boring device 2,22 Ground caulking 3,23 Mouth pipe 4,27,30 Prepender device 6,26 Inner rod 7,33 Core bit 8,42,46 Water stop member 9,47 Water supply valve 25 Outer rod 31 Drifter (Boring machine)
35 Connection part 48 Pressure gauge 50 Core sampling mechanism 51 Opening part 52 Outflow prevention plate (blocking means)
53 Core receiving device 54 Core catcher 80 Reverse water splash prevention device A Independent ground B Core

Claims (10)

The inner rod is inserted into the mouth pipe installed through the ground coking on the mouth hole wall of the self-supporting ground, and the inner rod by the boring machine is sent between the inner rod and the ground from the mouth pipe side. It is characterized by excavating with a core bit attached to the tip of the inner rod by feeding, striking and rotating, and sending the core scraped by this excavation to the base end side of the inner rod by reverse water and spring water pressure to collect it. Horizontal boring method. The horizontal boring method according to claim 1, wherein the core is collected from the base end opening of the inner rod. The horizontal boring method according to claim 1, wherein the core is taken out from an opening formed in the peripheral wall on the base end side of the inner rod. The horizontal boring method according to claim 3, wherein the opening and the base end opening of the inner rod are closed by a closing means so that the opening does not communicate with each other. A mouth pipe installed on the mouth hole wall of a self-supporting ground via ground coking, and a prepender device installed by connecting to the base end protruding outward from the mouth hole wall of this mouth pipe. An inner rod that is fed and rotatably inserted into the mouth pipe and installed, and an inner rod feeding and a boring machine for striking / rotating drive installed connected to the base end of the inner rod. A core bit is attached to the tip of the inner rod, and the prepender device is connected to a water stop member that stops water between the inner rod and the mouth pipe, and a water supply pump for drilling to connect water between the inner rod and the mouth pipe. A water supply valve is provided so that water from the water supply valve can be sent between the inner rod and the ground via the inner circumference of the mouth pipe and the outer circumference of the inner rod. A characteristic horizontal boring device. The horizontal boring device according to claim 5, wherein the outer rod is inserted deeper than the mouth tube at the tip between the inner circumference of the mouth tube and the outer circumference of the inner rod. The horizontal boring device according to claim 5 or 6, wherein a core sampling mechanism is installed around an inner rod between the prepender device and the boring machine. The core sampling mechanism was installed below the opening, an opening formed by a notch in the peripheral wall on the base end side of the inner rod, a closing means for closing the opening so that the base end opening of the inner rod does not communicate with each other, and an opening. The horizontal boring device according to claim 7, further comprising a core receiving device. The horizontal boring device according to claim 8, wherein the core receiving device has a separation mechanism for separating the core and slime collected from the opening. The horizontal boring according to claim 8 or 9, wherein a reverse water splash prevention device for preventing the reverse water discharged from the opening from splashing around the inner rod between the prepender device and the boring machine is installed. Device.

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