JP3311737B2 - 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 a drilling rig having a disaster prevention function against gas blowout from the ground caused by a digging operation. Available when excavating.

[0002]

2. Description of the Related Art Generally, when burying water pipes, sewer pipes, cables or the like in the ground, after digging a vertical hole, a horizontal hole extending horizontally from the bottom of the vertical hole is dug using a shield machine. We are working to install water pipes and sewer pipes there. However, when performing such work, it is dangerous if harmful gas is present in the ground. Therefore, prior to performing such work, from the viewpoint of ensuring safety,
It is necessary to conduct a geological survey or soil survey of the place in advance and specify whether or not gas exists in the ground, or if so, the type and concentration of the gas.

[0003] Therefore, conventionally, operations such as excavating underground using a drilling device, collecting and analyzing gas, and measuring gas pressure have been performed. The excavation work for such a geological or soil survey is usually performed in the following procedure. That is, first, the outer casing is buried in the ground, and excavation is performed by a drill rod to a depth required for the investigation. Next, after removing the excavating rod, an inner casing is erected on the excavated portion, and the gas gradually rising through the inner casing (investigation of pressure, type, concentration, etc.) is measured.

[0004]

However, in the investigation by the conventional excavator, there is a problem that when a high pressure gas is blown out from underground due to a series of excavation work, it cannot be coped with efficiently. there were. In other words, at the time of excavation, or at the time of gas measurement after excavation, and at any stage of erection and extraction of the inner casing,
High pressure gas may erupt from the ground, but in such cases, conventional drilling rigs did not have sufficient disaster prevention function against gas eruption, so it was necessary to move to work to block off the excavated part. There was a problem that can not be.

For example, at the time of gas measurement, a lid is simply placed on the upper end of the inner casing, and gas can only be collected from a gas collection port provided in the lid. Therefore, even if gas ejection occurs during gas measurement, a sealing fluid such as cement milk cannot be immediately injected into the inner casing.

[0006] In addition, the effect of the gas ejection is exerted not only on the inside of the inner casing but also on a gap formed around the inner casing. Further, when the water supply is stopped for the extension work of the drill rod, the influence of the gas ejection inside and outside the drill rod may occur. Therefore, it is desirable to take measures against gas ejection for the entire drilling rig and at all stages of a series of operations.

Further, measures against such gas eruptions include not only excavation work for geological and soil surveys, but also
It can be said that it is desirable to take the same way in the case of excavating underground, for example, when excavating for other purposes such as well construction.

An object of the present invention is to provide a drilling rig which has a sufficient disaster prevention function against gas ejection.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a drilling apparatus having a disaster prevention function against gas blowout from the ground caused by a drilling operation. In the inside of the drilling rod, a drilling liquid supply path for sending drilling liquid to the tip of the drilling rod is formed, and a check valve for the rod is provided in the middle of the drilling liquid supply path. The check valve for the rod allows the drilling liquid sent toward the tip of the drilling rod to pass therethrough, while entering the drilling liquid supply passage from the tip of the drilling rod in the direction opposite to the drilling liquid. It is characterized in that it is configured to cut off the flow of the flowing gas.

[0010] Here, the term "with the excavation work" includes gas ejection that occurs at any stage of excavation, measurement of gas after excavation, installation and removal of the inner casing after excavation. is there. The same applies to the following inventions.

The excavating liquid is usually muddy water, but is not limited thereto, and may be any liquid suitable for excavation. Further, the drilling liquid supply channel may be used not only for sending drilling liquid but also for sending a sealing fluid described later.

In the present invention, the drilling liquid sent toward the tip of the drilling rod through the drilling liquid supply passage in the drilling rod can pass through the rod check valve. On the other hand, a gas that enters the drilling liquid supply path from the tip of the drilling rod and travels in the opposite direction to the drilling liquid cannot pass through the rod check valve.

Therefore, for example, even if gas is ejected when the water supply is stopped to extend the drilling rod, this gas is stopped at the position of the check valve for the rod and intrudes upward. Cannot be achieved, thereby achieving the above object.

In the above-described excavating apparatus, the check valve for the rod may be configured so that the spherical member movable in the excavating liquid supply path and the pressure of the excavating liquid sent toward the distal end of the excavating rod. The spherical member supporting portion for supporting the receiving spherical member without blocking the drilling liquid supply path, and moves in the drilling liquid supply path under the pressure of gas directed in the opposite direction to the drilling liquid. It is desirable to have a configuration provided with a spherical member capturing section that closes the excavating liquid supply path by capturing the formed spherical member.

When the spherical member, the spherical member supporting portion and the spherical member catching portion are provided as described above, the function of the check valve can be realized by the movement of the spherical member. It is possible to prevent the gas from flowing backward.

Also, since it is a spherical member that moves, there is no need to consider the change in posture due to the movement, and how the member rotates, how it moves, and in what state the spherical member support portion and the spherical member Even if it comes in contact with the catching part, it eventually settles down to a certain state (open state in contact with the spherical member supporting part and closed state in contact with the spherical member capturing part), and the predetermined function is exhibited. Will be done.

Further, in the above-mentioned excavator, the spherical member is formed of a synthetic resin, and the spherical member supporting portion is
It is preferable that the spherical member capturing portion is formed so as to include a coil spring and has a tapered surface that makes contact with the spherical member.

In the case of such a configuration, the spherical member is made of a synthetic resin (for example, an acrylic resin is preferable).
Because of its light weight, when it is subjected to the pressure of gas, it can reliably move to the spherical member capturing portion to block the drilling liquid supply path, and can be manufactured or purchased at low cost. Therefore, the cost of the device can be reduced, and the device can be easily replaced.

Further, since the spherical member supporting portion is formed including the coil spring, it has elasticity, so that the spherical member can be prevented from being damaged when the spherical member comes into contact with or collides with the spherical member. Thus, the durability of the device is improved.

Further, since the spherical member catching portion is formed with a tapered surface, the spherical member catching portion and the spherical member are surely brought into contact with each other. You will be able to close it.

In the above-described excavator,
An outer casing buried in the ground and arranged on the outer peripheral side of the drilling rod, and an outer casing disposed above the flow path formed between the outer casing and the drilling rod, for gas rising through the flow path. A rod disaster prevention valve for preventing jetting, wherein the rod disaster prevention valve is disposed in a state of closing the upper part of a flow path formed between the outer casing and the excavation rod, and a rod disaster prevention valve body; It is placed inside the disaster prevention valve body and compressed and expanded in this arrangement to cut the gap formed between the drill rod and the rod disaster prevention valve body, and cut into the rod disaster prevention valve body. By being screwed into the threaded part, it is possible to advance and retreat along the axial direction of the drilling rod with respect to the rod disaster prevention valve main body, and the rod It is preferable that the rod packing consists and a member with a rod packing tightening widened by compressed clamping by being tightened is rotated in sandwiched down state.

In the case where such a disaster prevention valve for a rod is provided, it is also possible to prevent the gas which rises in the flow path formed between the outer casing and the excavating rod from being blown out, and the disaster prevention function of the apparatus is provided. Can be further enhanced.

The present invention also relates to a drilling device having a disaster prevention function against gas blowout from the ground caused by a drilling operation. An outer casing that is buried and disposed on the outer peripheral side of the drilling rod, an inner casing that is disposed inside the outer casing and inserted into a portion to be drilled by the drilling rod, and an inner casing that is connected to an upper end portion of the inner casing. A measurement unit for measuring gas rising in a flow path formed inside the casing, wherein the measurement unit is disposed so as to close an upper part of the flow path formed inside the inner casing. A pressure gauge provided on the lid for measuring gas pressure; a gas sampling port provided on the lid for collecting gas; and a sealing fluid provided on the lid for stopping gas ejection. Inject It is characterized in that at least includes a single opening and is configured can be used as sequestering for fluid inlet.

Here, the measuring unit is described as being "connected to the upper end of the inner casing", but it is not necessarily required to be directly connected to the upper end of the inner casing.
For example, it may be connected to the upper end of the inner casing via an inner casing short pipe provided with an inner casing check valve described later (in the case of FIG. 4 described later).

As the sealing fluid, cement milk, mortar, bentonite liquid, or a mixture thereof can be preferably used, but it is not limited thereto. A liquid material having a high viscosity may be used. In short, any liquid material having a large specific gravity and capable of overcoming the gas pressure and closing the excavated portion may be used.

Further, "can be used as a sealing fluid inlet for injecting a sealing fluid for stopping gas ejection" is not limited to an opening used only as a sealing fluid inlet. An opening that can be used as a gas discharge port for discharging gas may be used. And since it is "at least one opening", the number of openings may be one, but it is preferable to provide a plurality of openings. When a plurality of openings are provided, all of the plurality of openings may be used as a closing fluid inlet, or some openings may be used as a closing fluid inlet, and the remaining openings may be used as gas outlets. May be used.

The drilling rod, outer casing, inner casing, and measuring unit are not always used at the same time. For example, when drilling, only the drilling rod and outer casing are used. It is prepared on the premise that rearrangement such as using the inner casing and the measurement unit and not using the drilling rod is performed. The same applies to the following inventions.

In the present invention as described above, the measurement unit measures the gas rising through the flow path formed inside the inner casing. Specifically, the pressure of the gradually rising gas is measured by a pressure gauge, and the gas is sampled from a gas sampling port. When gas ejection occurs, at least one opening is used as a sealing fluid injection port, and the sealing fluid is injected from here.

[0029] For this reason, the configuration is not the same as that of a conventional drilling rig, which can only collect gas, but the measurement unit has an opening that can be used as a sealing fluid injection port. Can immediately respond to this and begin the work of injecting the sealing fluid,
Thereby, the above object is achieved.

Further, in the excavator provided with the above-described measuring unit, the excavator is disposed above the flow path formed between the outer casing and the inner casing to prevent the gas from flowing up the flow path from being ejected. A fire prevention valve for the casing, wherein the fire prevention valve for the inner casing is disposed so as to close an upper part of a flow path formed between the outer casing and the inner casing; A packing for the inner casing that closes a gap formed between the inner casing and the disaster prevention valve body for the inner casing by being arranged inside the valve body and compressed and expanded in this arrangement state, and a disaster prevention valve body for the inner casing Threaded to the threaded part of the inner casing to advance in the longitudinal direction of the inner casing relative to the inner casing disaster prevention valve body. An inner casing packing tightening member that is made freely, and is rotated and tightened while sandwiching the inner casing packing between the inner casing disaster prevention valve body and the inner casing packing, thereby compressing and expanding the inner casing packing. And it is desirable to be comprised.

When such a disaster prevention valve for the inner casing is provided, it is also possible to prevent the gas which rises in the flow path formed between the outer casing and the inner casing from being blown out. The functions can be further enhanced.

Further, the present invention relates to a drilling device provided with a disaster prevention function against gas spouting from the ground caused by a drilling operation, comprising: And an inner casing short pipe connected to the upper end of the inner casing, and inside the inner casing short pipe,
A check valve for the inner casing is provided, and the check valve for the inner casing allows a sealing fluid injected to stop gas ejection to pass therethrough, while abruptly forming a flow path formed inside the inner casing. The flow of the rising high-pressure gas is shut off.

In the present invention, the sealing fluid injected to stop the gas ejection can pass through the check valve for the inner casing. On the other hand, the high-pressure gas that rapidly rises in the flow path formed inside the inner casing cannot pass through the check valve for the inner casing.

Therefore, for example, even if gas is blown out when the inner casing is built or pulled out, this gas is stopped at the position of the check valve for the inner casing and cannot enter above it. On the other hand, the sealing fluid injected from above when the gas is ejected can pass through the check valve for the inner casing, so that the sealing operation can be performed, thereby achieving the above object.

The short pipe of the inner casing provided with the check valve for the inner casing can be suitably used when the inner casing is installed or pulled out (see FIG. 7 described later), but is not limited to this. Also, it can be used by connecting to the inner casing together with the above-mentioned measuring unit at the time of gas measurement (see FIG. 4 described later).

The above-described invention of the check valve for the rod (including the invention of the disaster prevention valve for the rod), the invention of the measuring unit (including the invention of the disaster prevention valve for the inner casing), and the invention for the inner casing. The invention of the check valve may be arbitrarily combined with each other.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an entire configuration (a state at the time of excavation) of the excavator 10 of the present embodiment. FIG.
7 are enlarged views of the main parts of the excavator 10. FIG.

In FIG. 1, a drilling device 10 includes a drilling rod 20 that drills in the ground while rotating, advances, a rotation imparting mechanism 40 that rotates the drilling rod 20, and a water pump that sends muddy water into the drilling rod 20. 41 and the rotation imparting mechanism 4
0 and an engine 42 that drives a water pump 41. The rotation of the engine 42 is transmitted to the water supply pump 41 via the belt 43, and also transmitted to the rotation applying mechanism 40 via the intermediate shaft 44 and the belt 45 which rotate in conjunction with this.

Just above the excavation point by the excavation rod 20, the tower 11 is arranged. A snatch block 13 for hanging a winding rope (also referred to as a hoisting rope) 12 used for pulling out the inner casing 90 or the like is provided at the top of the tower 11. A hook 14 is attached to an end of the winding rope 12.

A mud reservoir 15 is provided on the left side of the excavating rod 20 in the drawing. The mud reservoir 15 and the suction side of the water pump 41 are connected by a suction hose 16. One end of a water supply hose (also called a delivery hose) 17 is connected to the discharge side of the water supply pump 41, and the other end of the water supply hose 17 is connected to a water swivel 18. The water swivel 18 connects the flow path in the water supply hose 17 and the flow path in the drill rod 20 while rotatably supporting the drill rod 20 with bearings.

The excavating rod 20 is formed by joining a plurality of parts. Each part constituting the excavation rod 20 has, for example, a length of about 3 m and an outer diameter (diameter) of 40.
5 mm or the like. Further, a core tube 22 having a plurality of blades 21 for excavation is attached to a tip portion (lower end portion) of the excavation rod 20, and a check valve 30 for a rod is provided above the core tube 22. ing. Core tube 22
Is, for example, 86 mm or the like.

A cylindrical outer casing 50 is embedded on the outer peripheral side of the excavating rod 20. This outer casing 5
0 is configured by connecting a plurality of components. Each component constituting the outer casing 50 has, for example, a length of 2.
The diameter is about 75 m, and the inner diameter (diameter) is 156.2 mm. The outer casing 50 is usually composed of a buried layer or a loosely laid sandy ground or the like which is easily collapsed and
Is inserted, for example, to a position about 1 m deeper than a boundary position K with a relatively hard lower ground 2 made of a clay layer, a ground or the like on the lower side.

FIG. 2 shows the excavation rod 20 during excavation.
The detailed structure around is shown. In FIG. 2, the excavator 10 includes a cylindrical disaster prevention valve base casing 60 screwed to the upper end of the outer casing 50, an inner casing disaster prevention valve 70 provided above the disaster prevention valve base casing 60, and And a rod disaster prevention valve 8 provided further above the inner casing disaster prevention valve 70.
0. Disaster prevention valve 70 for the inner casing,
The O-ring shaped packing 71 is attached to the upper end flange of the disaster prevention valve basic casing 60 by a plurality of bolts 72 with the packing 71 interposed therebetween. Further, the disaster prevention valve for rod 80 is attached to the upper end flange portion of the disaster prevention valve for inner casing 70 by a plurality of bolts 82 with an O-ring shaped packing 81 interposed therebetween.

A ball valve 61 is provided on the left side of the disaster prevention valve basic casing 60 in the figure, and an opening 62 on the left side of the ball valve 61 is a muddy water discharge port, and a drainage hose 63 for discharging muddy water is connected. ing. The drain hose 63 guides the muddy water to the muddy water reservoir 15 (see FIG. 1).

A pressure gauge 64 for measuring gas pressure is provided on the valve 6 at the right side of the disaster prevention valve basic casing 60 in the drawing.
5, and a gas sampling port 66 for sampling gas is provided via a valve 67.

The rod disaster prevention valve 80 is a rod disaster prevention valve body 83 which is disposed so as to close the upper part of the flow path 51 formed between the outer casing 50 and the excavating rod 20.
One or more (here, two) O-ring shaped gaskets 84 for rods arranged inside the rod emergency valve body 83, and the rod gaskets 84 are tightened and compressed. And a rod packing tightening member 85 that expands.

The rod packing tightening member 85 has a male screw portion 85A, and the male screw portion 85A is screwed into a female screw portion 83A cut into the rod disaster prevention valve body 83 to thereby form the rod disaster prevention valve body 83. Attached to.
When the rod packing tightening member 85 is rotated, a screw pair is formed. Therefore, the rod packing tightening member 85 moves in the axial direction (vertical direction) of the excavating rod 20 with respect to the rod disaster prevention valve body 83. ).

Further, a rod packing tightening member 8 is provided on the upper end flange portion 85C of the rod packing tightening member 85.
A plurality (here, two) of handle mounting portions 85E for mounting handles 85D for rotating the handle 5 are provided. The handle 85D is formed by threading a part of a rod-shaped member, is screwed to a handle mounting portion 85E, and is detachable.

Lower end surface 8 of rod packing tightening member 85
A rod packing 84 is sandwiched between 5B and the bottom surface 83B of the internal space of the rod disaster prevention valve main body 83. Therefore, when the rod packing tightening member 85 is rotated and tightened, the rod packing tightening member 85 descends, whereby the rod packing 84 is tightened, compressed, and expanded. The inner peripheral end of the expanded rod packing 84 is pressed against the excavation rod 20, whereby the gap 83 </ b> C formed between the excavation rod 20 and the rod disaster prevention valve main body 83 is closed. I have. In addition,
In a state where the rod packing 84 is not compressed, the gap between the rod packing 84 and the excavating rod 20 may be, for example, about 1 to 2 mm.

FIG. 3 is an enlarged sectional view of the check valve 30 for a rod. In FIG. 3, a drilling liquid supply path 23 for sending drilling liquid such as muddy water to a core tube 22 provided at the tip of the drilling rod 20 is formed inside the drilling rod 20. Is the drilling liquid supply channel 2
3 is provided in the middle.

The rod check valve 30 is a cylindrical metal intermediate member 31 having a drilling liquid supply passage 23 formed therein.
A metal lower end member 32 disposed below the intermediate member 31 (the core tube 22 side); a metal upper end member 33 disposed above the intermediate member 31; and a drilling liquid formed on the intermediate member 31. Spherical member 34 movable in supply path 23
And a coil spring 35 which is a spherical member supporting portion for supporting the spherical member 34 in the excavating liquid supply path 23. The spherical member 34 is formed of, for example, a synthetic resin such as an acrylic resin, and has a size of, for example, a diameter of 22 mm.
It is about.

The male screw 32A of the lower end member 32 is screwed into a female screw 31A cut at the lower end of the intermediate member 31. The lower end member 32 has a cylindrical coil spring receiving portion 32B protruding toward the excavating liquid supply passage 23 inside the intermediate member 31. The outer diameter of the coil spring receiving portion 32B is substantially the same as or slightly smaller than the inner diameter of the coil spring 35, and the coil spring 35 is fitted on the outer periphery of the coil spring receiving portion 32B.

When the coil spring 35 supports the spherical member 34 under the pressure of the drilling liquid sent toward the core tube 22 (the spherical member 34
Is in the state of the solid line in FIG.
A gap 36 is formed between the coil spring receiving portion 32B and the tip portion 32C of the coil spring receiving portion 32B, so that the excavating liquid supply passage 23 is not closed.

The male screw portion 33A of the upper end member 33 is screwed to a female screw portion 31B cut at the upper end of the intermediate member 31. The part of the upper end member 33 facing the excavating liquid supply passage 23 inside the intermediate member 31 is a spherical member capture that captures the spherical member 34 that has moved as indicated by the arrow S in FIG. It is a part 33B. A trumpet-shaped tapered surface 33C is formed in the spherical member capturing portion 33B, and the spherical member 34 comes into contact with the tapered surface 33C as shown by a two-dot chain line in FIG.
3 is closed to shut off the gas flow.

FIG. 4 shows a detailed structure around the inner casing 90 at the time of gas measurement. In FIG. 4, a drilling device 10 includes a cylindrical inner casing 90 which is disposed inside an outer casing 50 and is inserted into a portion to be drilled by the drilling rod 20, and a cylinder which is screwed to an upper end of the inner casing 90. -Shaped inner casing short pipe 100,
Further, there is provided a measurement unit 110 which measures a gas which is screwed and connected to an upper end portion of the inner casing short pipe 100 and rises in a flow path 91 formed inside the inner casing 90.

The inner casing 90 is formed by connecting a plurality of parts. Each component constituting the inner casing 90 has, for example, a length of about 2.75 m, an inner diameter (diameter) of 90 mm, and an outer diameter (diameter) of 97 mm.

An inner casing disaster prevention valve 70 is provided on the outer peripheral side of the inner casing 90. The disaster prevention valve 70 for the inner casing includes a disaster prevention valve body 73 for the inner casing which is disposed so as to close an upper portion of a flow path 92 formed between the outer casing 50 and the inner casing 90, and a disaster prevention valve body for the inner casing. O placed inside 73
One or more rings (here, six)
, And an inner casing packing tightening member 75 for tightening, compressing and expanding the inner casing packing 74.

The packing fastening member 75 for the inner casing is
It has an external thread portion 75A, and is screwed into the internal thread portion 73A cut into the internal casing disaster prevention valve main body 73 to be mounted on the internal casing disaster prevention valve main body 73. When the inner casing gasket tightening member 75 is rotated, a screw pair is formed, so that the inner casing gasket tightening member 75 is moved relative to the inner casing disaster prevention valve body 73 by the inner casing 90.
In the longitudinal direction (vertical direction).

The packing fastening member 7 for the inner casing 7
A plurality (here, four) of handle mounting portions 75E for mounting a handle 75D for rotating the inner casing packing tightening member 75 are provided on the upper end flange portion 75C of the fifth flange portion 75C. The handle 75D is a handle 85D for rotating the rod packing tightening member 85.
(Refer to FIG. 2).
It is screwed to 5E and detachable.

An inner casing packing 74 is sandwiched between a lower end surface 75B of the inner casing packing fastening member 75 and a bottom surface 73B of the inner space of the inner casing disaster prevention valve body 73. Accordingly, when the inner casing packing tightening member 75 is rotated and tightened, the inner casing packing tightening member 75 is lowered, whereby the inner casing packing 74 is tightened and compressed to expand. And
The expanded inner peripheral end of the inner casing gasket 74 is pressed against the outer peripheral surface of the inner casing 90, whereby the gap 73 </ b> C formed between the inner casing 90 and the inner casing disaster prevention valve body 73 is closed. It has become. When the packing 74 for the inner casing is not compressed, the gap between the packing 74 for the inner casing and the outer peripheral surface of the inner casing 90 may be, for example, about 1 to 2 mm.

FIG. 5 is an enlarged perspective view of the measuring unit 110. 4 and 5, the measuring unit 110
Is provided with a lid 111 arranged so as to close the upper part of the flow path 91 formed inside the inner casing 90. The lid 111 includes an upper lid 111A and a lower lid 111B.
These are divided into a plurality of bolts 11 with an O-ring-shaped packing (not shown) interposed therebetween.
2 are integrated. And the lower lid 111B
Is screwed to the upper end of the inner casing short pipe 100. In addition, the lower lid 111 </ b> B is
It is also possible to directly screw-connect to the upper end of the inner casing 90 without passing through the inner casing 90.

The measuring unit 110 injects a pressure gauge 113 for measuring gas pressure, a gas sampling port 114 for sampling gas, and a sealing fluid (cement milk, mortar, etc.) for stopping gas ejection. A plurality of (here, two) openings 115 and 116 can be used as a sealing fluid injection port. The opening 11
Both 5,116 may be used as sealing fluid inlets, or either one may be used as a gas outlet.

The pressure gauge 113 is provided on the upper lid 111A via a valve 117, and the gas sampling port 114 is provided on the upper lid 111A via a valve 118.
Further, a forked pipe 119 is connected to the upper lid 111A. The openings 115 and 116 are provided in the forked pipe 119.
And a valve 1 provided at each end of the forked pipe 119
It is provided on the upper lid 111 </ b> A via 20, 121. The upper lid 111A is provided with two inverted U-shaped handles 122.

FIG. 6 is an enlarged sectional view of the inner casing short pipe 100. 4 and 6, an inner casing check valve 101 is provided inside the inner casing short pipe 100. The inner casing check valve 101 is provided with a partition portion 101A provided inside the inner casing short pipe 100.
And a communication port 101B formed in the partition 101A.
For example, a plate-shaped lid member 10 for closing the communication port 101B.
1C and a hinge 101D that rotatably supports the lid member 101C. The hinge 101D is fixed to the partition 101A. Also, the lid member 101C
Is provided with a contact rod 101E which rises vertically from the lower surface, for example. The distal end of the contact rod 101E comes into contact with the inner peripheral surface of the inner casing short tube 100 when the cover member 101C is fully opened (the state shown by the two-dot chain line in the figure).

When the sealing fluid for stopping gas injection is injected from above, the check valve 101C for the inner casing causes the cover member 101C to be in the state of the two-dot chain line in the figure, and the sealing fluid is moved downward. Can be passed. On the other hand, when the high-pressure gas suddenly rises in the flow path 91 formed inside the inner casing 90 by the gas ejection, the lid member 101C is in the state of the solid line in the drawing, and the flow of the high-pressure gas is shut off. For relatively low pressure gas that gradually rises, the inner casing check valve 101 does not operate.
Gas can be passed upward.

In FIG. 4, a pressure gauge 102 for measuring gas pressure is provided on the left side of the inner casing short pipe 100 in the figure.
Is provided via a valve 103. Further, a gas sampling port 104 for sampling gas is provided via a valve 105 at the right side of the inner casing short pipe 100 in the drawing.

FIG. 7 shows a detailed structure around the inner casing 90 when the inner casing 90 is pulled out. In FIG. 7, the excavator 10 includes a casing head 130 that is screwed to the upper end of the inner casing short pipe 100 and that is disposed so as to close the upper side of a flow path 91 formed inside the inner casing 90. I have. A hoisting swivel 131 for hooking the hook 14 (see FIG. 1) attached to the end of the winding rope 12 and lifting the inner casing 90 is detachably attached to the casing head 130. Further, a whistling water swivel 133 having a sealing fluid injection port 132 for re-injecting a sealing fluid such as cement milk is separately prepared. Like the hoisting swivel 131, the hoisting water swivel 133 can be removably attached to the casing head 130, and can be replaced with the hoisting swivel 131.

In this embodiment, excavation is performed using the excavator 10 as described below, and gas is measured.

First, as shown in FIG. 1, the outer casing 50 is buried to a position slightly deeper than the boundary position K between the surface ground 1 and the lower ground 2. Next, as shown in FIG. 2, a disaster prevention valve basic casing 60, a disaster prevention valve 70 for an inner casing, and a disaster prevention valve 80 for a rod are assembled above the outer casing 50.

Subsequently, the excavation rod 20 is inserted to start excavation. At the time of excavation, the engine 42 is started to rotate the excavation rod 20 by the rotation imparting mechanism 40, and muddy water is sent to the excavation rod 20 through the water supply hose 17 and the water swivel 18 by the water supply pump 41 as shown by the arrow A in FIG. . The muddy water sent to the drilling rod 20 is discharged from the core tube 22 to the outside through the drilling liquid supply path 23 as shown by an arrow B in FIG. The muddy water is sent upward together with the earth and sand excavated by the core tube 22 as shown by the arrow C in FIG. 1, passes through the flow path 51 formed between the outer casing 50 and the excavation rod 20, and further flows. As shown by an arrow D in FIG. 1, the water is guided to the mud reservoir 15 through a drain hose 63. Then, the sediment mixed in the muddy water is settled in the muddy sump 15, and the relatively clear upper portion of the muddy water stored in the muddy sump 15 is
As shown by an arrow E in FIG. 1, the water is sucked into the water supply pump 41 through the suction hose 16, sent to the drilling rod 20 again, and circulated.

When the excavation is performed by rotating the excavation rod 20, the rod disaster prevention valve 80 is not loosened but tightened, and the rod packing 84 is not pressed against the excavation rod 20.

The excavation rod 20 is gradually extended by removing the water swivel 18 and connecting the components of the excavation rod 20 according to the excavation condition, and excavation is performed to a depth at which the investigation is required. When the extension work of the excavation rod 20 is performed, the water supply by the water supply pump 41 is stopped. At this time, gas may be ejected.

When gas ejection occurs, gas enters the drilling rod 20 from the core tube 22. However, the invading gas cannot pass through the check valve 30 for the rod, and the flow of the gas is shut off here (see FIGS. 1 and 3). The gas is supplied to the outer casing 50 and the drill rod 2.
0 through the flow path 51 formed between
In some cases, the gas may be ejected from a gap 83C formed between the rod and the rod disaster prevention valve main body 83. In this case, the handle 85D is operated to tighten the rod disaster prevention valve 80, and the rod packing 84 is formed. May be used to close the gap 83C. Further, the pressure of the gas is measured by the pressure gauge 64, and the valve 67 is opened to collect the gas from the gas sampling port 66, and the type and concentration of the gas are investigated. Thereafter, a sealing fluid such as mortar is injected from the drilling rod 20 to stop gas emission, and finally the excavated portion is filled and sealed with the sealing fluid, and the drilling rod 20 is removed to remove the outer casing 5.
0 and its upper part are removed.

Next, excavation is performed to the depth required for the investigation, and if there is no gas ejection, preparation for gas measurement is started as shown in FIG. Specifically, pull out the drilling rod 20,
After removing the disaster prevention valve 80 for the rod, the inner casing 90 is inserted to the depth excavated with the excavating rod 20, and the inner casing short pipe 100 is further inserted into the upper end of the inner casing 90.
And the measurement unit 110 is attached. Here, the opening 115 of the measurement unit 110 is used as a sealing fluid inlet, and the opening 116 is opened and used as a gas outlet. Then, in this state, for example, if the apparatus is left for one day, the gas contained in the ground gradually rises through the passage 91 in the inner casing 90 with the passage of time. The pressure is measured by the pressure gauge 113, the valve 118 is opened, gas is sampled from the gas sampling port 114, and the type, concentration and the like are investigated. At this time, since the gas does not rise rapidly as in the case of the jetting, the check valve 10 for the inner casing is not used.
1 does not operate, and the lid member 101C is in an open state (the state shown by the two-dot chain line in FIGS. 4 and 6).

On the other hand, during the above gas measurement, the rising gas accumulates in the upper part of the inner casing 90,
When the water level in the inner casing 90 decreases, the weight of the water column decreases, so that the pressure of gas from below cannot be suppressed, and gas ejection may occur. In this case, the check valve 101 for the inner casing is operated, and the lid member 101C is in a closed state (the state shown by the solid line in FIGS. 4 and 6). Therefore, the high-pressure gas does not reach the measurement unit 110. Further, the gas passes through a flow path 92 formed between the outer casing 50 and the inner casing 90 and a gap 73 formed between the inner casing 90 and the disaster prevention valve body 73 for the inner casing.
However, in this case, the handle 75D is operated to tighten the inner casing disaster prevention valve 70, and the inner casing gasket 74 is used to close the gap 73C.
I just need to close up. Then, the pressure of the gas is measured by the pressure gauge 102 and the valve 105 is opened to open the gas sampling port 10.
4. Collect gas from 4 and investigate its type and concentration.

Thereafter, a sealing operation for filling the excavated portion is performed. First, when the gas measurement by the measurement unit 110 is completed without gas emission, the blockage is performed according to the following operation procedure. That is, in a state in which the apparatus is assembled as shown in FIG. 4, the valve 120 is opened, muddy water is poured from the opening 115, the muddy water is filled up to a predetermined level in the inner casing 90, and the inner casing 90 and the upper inner casing are shorted. The tube 100 and the measuring unit 110 are pulled out. Subsequently, a sealing fluid such as cement milk is injected by the excavation rod 20 to fill the vicinity of the ground surface (the upper surface of the surface ground 1) (for example, a position at a depth of about 1 m from the ground surface). At this time, the rod disaster prevention valve 80 may be attached for safety. Then, the entire excavator 10 is removed, and sand is spread on the sealing fluid to fill the ground surface.

On the other hand, when gas is ejected, the check valve 101 for the inner casing is actuated by the high-pressure gas, and the cover member 101C is closed (the state indicated by the solid line in FIGS. 4 and 6). Sealing is performed according to the following procedure. That is, the valve 120 is opened, and a sealing fluid such as cement milk is injected from the opening 115 to fill the vicinity of the ground surface (the upper surface of the surface ground 1) (for example, a position at a depth of about 1 m from the ground surface). The injection amount can be controlled by adjusting the opening of the valve 120. At this time, the closed lid member 101C is pushed and opened by the closing fluid, and can pass the closing fluid downward.

After the injection is completed, the pressure of the gas is measured by the pressure gauge 102 to confirm the safety. When the pressure of the gas decreases after the injection is completed or during the progress of the injection, the lid member 101C is opened. In this case, the pressure of the gas applied to the measurement unit 110 is desired to be further reduced. In this case, the valve 121 is opened appropriately to open the opening 11.
6 may emit gas. At this time, the amount of release can be controlled by adjusting the opening of the valve 121.

Subsequently, when safety is confirmed, the measuring unit 110 is removed, and a casing head 130 is attached to the removed position as shown in FIG. And
Hoisting swivel 131 on casing head 130
And the hook 14 at the end of the winding rope 12 is hooked onto it, and the winding drum 12 is wound up by rotating the rotary drum in this state, whereby the inner casing 90 and the inner casing short pipe 100 are lifted together with the casing head 130.

This lifting operation is performed for each length (for example, 2.75 m) of one component of the inner casing 90. In other words, when the length of one piece is lifted,
The pressure of the gas is measured by the pressure gauge 102 to confirm safety, and the inner casing 90 and the inner casing short pipe 100 are separated. Then, only one component of the inner casing 90 located at the top at the time of the separation is removed, and the component located at the top located newly below the removed component is now located at the top. Then, the casing head 130 is replaced. By repeating this operation, the entire inner casing 90 is pulled out.

If the gas is blown out during the operation despite the injection of the sealing fluid such as cement milk when the inner casing 90 is pulled out, the reverse of the inner casing 90 is performed. When the stop valve 101 operates, the lid member 1
01C closes. In this case, the hoisting swivel 131 is replaced by the hoisting water swivel 133, and the sealing fluid such as cement milk is re-injected from the sealing fluid injection port 132.

After the inner casing 90 has been pulled out, the inner casing disaster prevention valve 70, the disaster prevention valve base casing 60, and the outer casing 50 are removed, and sand is poured on the sealing fluid to fill the ground surface. Then, the closing operation is completed.

According to this embodiment, the following effects can be obtained. That is, since the excavator 10 is provided with the check valve 30 for a rod, the upward flow of gas at the time of gas ejection can be shut off, so that the disaster prevention function can be improved (see FIG. 3). .

Further, the check valve 30 for the rod is
When the spherical member 34 moves as indicated by the arrow S in FIG. 3, it is assumed that the spherical member 34 rotates and arrives at the spherical member capturing portion 33B by any route. Also, since the shape is spherical, it finally becomes surely settled in a certain state, and the drilling liquid supply path 23 can be surely closed to perform a predetermined function.

Further, since the spherical member 34 is made of a synthetic resin such as an acrylic resin, it is lightweight, so that when it receives gas pressure, it moves to the spherical member catching portion 33B without fail. In addition, since the drilling liquid supply passage 23 can be closed, and can be manufactured or purchased at low cost, the cost of the drilling device 10 can be reduced, and the drilling device 10 can be easily replaced as a consumable.

Then, the spherical member supporting portion is a coil spring 35
, The elastic member can prevent the spherical member 34 from being damaged when the spherical member 34 comes into contact with or collides with it, and the durability of the excavator 10 can be improved. .

Since the tapered surface 33C is formed in the spherical member catching portion 33B, the spherical member catching portion 33B and the spherical member 34 can be reliably brought into contact with each other. 23 can be more reliably closed.

Further, since the excavator 10 is provided with the rod disaster prevention valve 80, it is possible to prevent gas from flowing up the flow path 51 formed between the outer casing 50 and the excavation rod 20. Thus, the disaster prevention function of the excavator 10 can be further enhanced (see FIG. 2).

Since the excavator 10 is provided with the disaster prevention valve 70 for the inner casing, it is possible to prevent the gas from flowing upward in the flow path 92 formed between the outer casing 50 and the inner casing 90. Thus, the disaster prevention function of the excavator 10 can be further enhanced (see FIG. 4).

The handle 85D of the rod disaster prevention valve 80 and the handle 7D of the inner casing disaster prevention valve 70
Since 5D has the same diameter, these handles can also be used. In the case of this embodiment, if a total of four handles are prepared, the disaster prevention valve 80 for the rod and the disaster prevention valve 70 for the inner casing can be used. Both can be tightened. Therefore, the number of parts can be reduced.

Further, the excavator 10 includes a measuring unit 11
The measurement unit 110 includes not only a pressure gauge 113 and a gas sampling port 114 but also openings 115 and 116.
, Not only can the gas pressure be measured and the gas can be sampled, but also at least one of the openings 115 and 116 can be used as a sealing fluid inlet. For this reason, when gas ejection occurs, the operation of injecting a sealing fluid such as mortar can be started immediately in response to this, and the disaster prevention function of the excavator 10 can be improved. Then, the openings 115 and 116
Can also be used as a gas discharge port, so that the disaster prevention function can be further improved.

The excavator 10 has an inner casing short pipe 100, and the inner casing short pipe 100 is provided with an inner casing check valve 101. The flow of the high-pressure gas that rapidly rises in the flow passage 91 can be cut off, thereby also improving the disaster prevention function of the excavator 10.

The present invention is not limited to the above-described embodiment, but includes modifications and the like within a range that can achieve the object of the present invention.

That is, in the above-described embodiment, the spherical member supporting portion is formed by the coil spring 35 (see FIG. 3).
Reference), the spherical member support portion of the present invention is not limited to this. For example, a net may be provided in the excavating liquid supply path 23, and may be arranged on a surface orthogonal to the flow direction. A bar-shaped member may be provided, or two parallel rod-shaped members may be provided so as to be arranged on a plane perpendicular to the flow direction. In short, under the pressure of drilling liquid such as muddy water The spherical member 34 in the excavating liquid supply path 2
It is only necessary that the support 3 can be supported without being closed.

Further, in the rod disaster prevention valve 80 of the above embodiment, the male member 8
5A has been cut, and the female screw portion 83A has been cut in the rod disaster prevention valve main body 83. However, the male screw portion and the female screw portion may be cut into opposite members. The same applies to the disaster prevention valve 70 for the inner casing.

Further, in the above embodiment, the inner casing short pipe 100 is arranged between the inner casing 90 and the measuring unit 110 at the time of gas measurement (see FIG. 4). The arrangement of 100 may be omitted.

In the above embodiment, when the inner casing 90 is pulled out (see FIG. 7), the inner casing short pipe 10
Although 0 is attached, the inner casing short pipe 100 may be attached when the inner casing 90 is installed.

[0098]

As described above, according to the present invention, the drilling rig is provided with a check valve for a rod, or at least one of which can be used as a pressure gauge, a gas sampling port, and a sealing fluid inlet. Since there is a measuring unit including two openings and a short pipe of the inner casing provided with a check valve for the inner casing, it is possible to sufficiently exert a disaster prevention function against gas ejection. There is.

Further, when a disaster prevention valve for a rod or a disaster prevention valve for an inner casing is provided in an excavator, there is an effect that a disaster prevention function against gas ejection can be more sufficiently exerted.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an excavator according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram around a digging rod at the time of digging in the embodiment.

FIG. 3 is an enlarged cross-sectional view of the check valve for a rod according to the embodiment.

FIG. 4 is a detailed configuration diagram around an inner casing at the time of gas measurement of the embodiment.

FIG. 5 is an enlarged perspective view of the measuring unit of the embodiment.

FIG. 6 is an enlarged sectional view of an inner casing short pipe of the embodiment.

FIG. 7 is a detailed configuration diagram around the inner casing when the inner casing of the embodiment is pulled out.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Drilling apparatus 20 Drilling rod 23 Liquid supply path for drilling 30 Check valve for rod 33B Spherical member capturing part 33C Tapered surface 34 Spherical member 35 Coil spring serving as a spherical member support part 50 Outer casing 70 Disaster prevention valve for inner casing 73 Inner casing Disaster prevention valve body 74 Inner casing packing 75 Inner casing packing fastening member 80 Rod disaster prevention valve 83 Rod disaster prevention valve body 84 Rod packing 85 Rod packing fastening member 90 Inner casing 100 Inner casing short pipe 101 Inner casing Check valve 110 Measuring unit 111 Lid 113 Pressure gauge 114 Gas sampling port 115, 116 Opening usable as fluid inlet for blockade

Claims (7)

(57) [Claims] 1. A drilling device having a disaster prevention function against gas blowout from the ground caused by a drilling operation, comprising: a drilling rod that rotates and drills into the ground to advance. A drilling liquid supply path for sending drilling liquid is formed at the tip of the drilling rod, and a rod check valve is provided in the middle of the drilling liquid supply path. While passing the drilling liquid sent toward the tip of the drilling rod, the gas that enters the drilling liquid supply path from the tip of the drilling rod and travels in the opposite direction to the drilling liquid It is configured to shut off the flow Rutotomoni, the check valve for the rod, moving the drilling liquid supply channel
The spherical member made free and the excavating part sent toward the tip of the excavating rod
Digging the spherical member under the pressure of the liquid
Spherical member support that supports the cutting liquid supply path without blocking
A lifting unit, receives the pressure of the gas towards the opposite direction to the drilling fluid
The spherical member moving in the excavating liquid supply path
Block the liquid supply channel for drilling by capturing
An excavator, comprising: a spherical member capturing unit . 2. The excavator according to claim 1 , wherein the spherical member is formed of a synthetic resin, the spherical member supporting portion is formed including a coil spring, and the spherical member capturing portion includes An excavator characterized in that a tapered surface for making contact with a spherical member is formed. 3. A drilling device according to claim 1 or 2, formed between the outer casing which is arranged to be embedded in the ground on the outer periphery of the drill rod, and the outer casing the drill rod A disaster prevention valve for a rod that is disposed above the flow path that has been formed and that prevents gas from rising in the flow path. The disaster prevention valve for a rod is formed between the outer casing and the excavation rod. A rod-shaped disaster prevention valve main body arranged to close the upper part of the formed flow path; and a drilling rod and the rod for being disposed inside the rod disaster prevention valve main body and compressed and expanded in this arrangement state. A rod packing for closing a gap formed between the rod and the disaster prevention valve body; and a rod-shaped disaster prevention valve which is screwed into a threaded portion of the rod disaster prevention valve body. The rod packing is made rotatable with respect to the main body along the axial direction of the excavation rod, and is rotated and tightened while sandwiching the rod packing between the rod disaster prevention valve main body. And a rod packing tightening member for tightening, compressing and expanding the rod. 4. Gas from underground caused by excavation work
A drilling rig with a disaster prevention function against eruptions, A drill rod that drills into the ground while rotating and moves forward;
Buried in the storage area and arranged on the outer peripheral side of the drilling rod.
Outer casing, and the outer casing and the drilling rod
This channel is located above the channel formed between
Disaster prevention valve for rod to prevent rising gas spout
Prepared, Inside the drilling rod, at the tip of this drilling rod
A drilling liquid supply channel for sending drilling liquid is formed, A check valve for a rod is provided in the middle of the drilling liquid supply path.
Kere, The check valve for the rod is directed toward the tip of the drilling rod.
While passing the drilling liquid sent by
Enter the drilling liquid supply channel from the tip of the shaving rod
Blocks gas flow in the opposite direction to the drilling liquid
Configuration, The disaster prevention valve for a rod includes the outer casing and the
Arranged so as to block the upper part of the flow path formed between
A rod-shaped disaster prevention valve body, It is located inside the rod
The drilling lock is compressed and expanded in the
Gap formed between the rod and the rod disaster prevention valve body
Rod packing to close the gap, Screwed into the thread cut in the rod disaster prevention valve body
By being attached to the rod disaster prevention valve body
To move back and forth along the axial direction of the drilling rod. And before
The packing for the rod is located between the rod and the disaster prevention valve body.
To be tightened by being rotated while sandwiching
The packing for the rod by tightening and compressing it.
And a gasket tightening member.
Digging rig. 5. An excavation device having a disaster prevention function against gas spouting from the ground caused by excavation work, comprising: a drilling rod that rotates and excavates the underground and buried in the ground. An outer casing arranged on the outer peripheral side of the excavating rod, an inner casing arranged inside the outer casing and inserted into a portion to be excavated by the excavating rod, and an inner casing connected to an upper end of the inner casing. A measurement unit for measuring gas rising through a flow path formed inside the casing, wherein the measurement unit is disposed so as to block an upper part of the flow path formed inside the inner casing. A lid, a pressure gauge provided on the lid to measure the pressure of the gas, and a gas sampling port provided on the lid to collect the gas,
An excavating device, comprising: at least one opening provided in the lid and usable as a sealing fluid inlet for injecting the sealing fluid for stopping the gas ejection. 6. The excavator according to claim 5, wherein the excavator is disposed above a flow path formed between the outer casing and the inner casing to prevent ejection of gas rising in the flow path. An internal casing disaster prevention valve, comprising: an inner casing disaster prevention valve main body, wherein the inner casing disaster prevention valve main body is disposed so as to close an upper part of a flow path formed between the outer casing and the inner casing. An inner casing packing that is disposed inside the inner casing disaster prevention valve body and is compressed and expanded in this arrangement state to close a gap formed between the inner casing and the inner casing disaster prevention valve body, The inner casing is attached to a threaded portion of the inner casing disaster prevention valve body by screwing the inner casing to the inner casing disaster prevention valve body. The inner casing gasket is tightened by being rotated in a state where the inner casing gasket is sandwiched between the inner casing gasket and the inner casing disaster prevention valve main body. An excavator, comprising: an inner casing packing fastening member that expands by compression. 7. A drilling device having a disaster prevention function against gas blowout from the ground that occurs during a drilling operation, comprising: a drilling rod that rotates and drills through the ground, and a drilling part formed by the drilling rod. And an inner casing short pipe connected to the upper end of the inner casing. Inside the inner casing short pipe, a check valve for the inner casing is provided. The check valve is configured to pass the sealing fluid injected to stop the gas ejection and to shut off the flow of the high-pressure gas that rapidly rises through the flow path formed inside the inner casing. A drilling rig characterized in that: