JPH0726872A - Boring rod - Google Patents

Abstract

PURPOSE:To facilitate connection, disconnection, and centering of a boring rod. CONSTITUTION:A plurality of fluid conduits 10, 11,... are interconnected each time a rod body 1a is coupled. Since the fluid conduits 10, 11,... are arranged in a manner not to be wrapped with each other, the outside diameters of the fluid conduits 10, 11,... are fairly smaller than the outside diameter of the rod body 1a and the fluid conduits 10, 11,... are interconnected only by using a small spanner. Thus, compared with a conventional multiple pipe system, torque is reduced and centering is also simplified.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to boring rods. More specifically, the present invention relates to a boring rod provided with a plurality of conduits for circulating a plurality of types of fluids such as a ground improvement material such as cement milk, a quick-setting agent, and air.

[0002]

2. Description of the Related Art Generally, in boring for drilling a hole in the ground, drilling water is injected into the hole through a boring rod in order to discharge the chips scraped by the bit at the tip of the boring rod to the ground. The drilling water is discharged to the ground through the gap between the boring rod and the hole wall along with chips.

If the formation is a soft layer, the hole wall may collapse and the chips may not be discharged. In that case, the boring rod is a double pipe, the drilling water is supplied into the inner pipe, and the chips and drainage are discharged through the gap between the inner pipe and the outer pipe. In order to ensure the drainage, a vacuumer on the ground may forcibly discharge from the gap between the inner and outer pipes.

On the other hand, in the case of ground improvement, the rod has a triple pipe structure in order to eject high-pressure water, cement milk, air, etc. simultaneously from the tip of the rod. Further, recently, various ground improvement methods have been proposed, and therefore a rod provided with a flow path for passing various kinds of different fluids and a signal cable is required. In this case as well, it is conceivable to use the rod as a multiple tube.

However, when the boring rod is a multiple pipe, the following problems occur.

(1) In the multi-pipe system, pipes having the same diameter are generally sequentially connected in the longitudinal direction by screw connection, but a large tool such as a pipe wrench is required for connecting and disconnecting the pipes. Requires a large torque for rotation.

(2) When connecting pipes, it is difficult to align the pipes located inside.

(3) Since the multiple pipe system is a system in which small diameter pipes are sequentially arranged in a pipe made of steel pipe, the whole rod becomes heavy.

[0009]

The present invention has been made based on the above technical background, and achieves the following objects.

An object of the present invention is to provide a boring rod which can be easily connected and disconnected.

Another object of the present invention is to provide a boring rod whose centering is easy.

Another object of the present invention is to provide a boring rod which can avoid an increase in weight which would occur when a multi-tube system is adopted.

[0013]

The present invention adopts the following means in order to achieve the above object.

The present invention relates to a boring rod (1) in which a large number of rods are connected in the axial direction and penetrate into the ground,
A rod body (1a) made of a rigid pipe, and first coupling means (16) provided at both ends of the rod body (1a) for connecting the rod bodies adjacent to each other.
a), (16b), a plurality of fluid conduits (10), (11) ... Arranged inside the rod body (1a) along the axial direction so as not to include each other, and each of the fluids. In order to connect the fluid conduits (10), (11) ... Provided at both ends of the conduits (10), (11) ... Second coupling means (10a), (11a)
It consists of and.

Each of the fluid conduits has a flexible hose (1
0), (11) ...

Each of the fluid conduits is a rigid pipe (20),
(21) consists of ...

The first coupling means includes joint portions (27) and (27) provided at both ends of the rod body, and the joint portions (27) of the rod bodies (1a) and (1a) adjacent to each other. , (27) and a fixing means (36) for fixing each other, and the second coupling means includes the joint portions (27) and (27) and the joint portions (27) and (2).
7) corresponding to each of the fluid conduits (20), (21), ..., A plurality of joint holes (20a), () to which the ends of each of the fluid conduits (20), (21) ... Are joined. 21a) ...

The coupling holes (20a), (21a) of the boring rods connected to each other are provided with a coupling (22) provided in one of the coupling holes so as to communicate with each other.
c) and (24c), the fluid conduit (20),
One of (21) ... Is a slime discharge fluid conduit (24), and a slime discharge port (50) is opened to the other joint hole (24a) that constitutes a part of the slime discharge flow path.
Is provided in the other joint part (27), and the slime discharge port (50) is closed by the coupling (24c) when the boring rod is connected. One of the joint parts (27), (27) A recess (37) extending in the axial direction of the rod body (1a) is formed in the joint part (27), and a protrusion (38) fitted in the recess (37) in the other joint part (27). Are formed.

Further, the present invention is a boring rod (1) having a large number of rods connected to each other in the axial direction and penetrating into the ground. The rod main body (1a) is made of a rigid pipe and is provided at both ends of the rod main body. First connecting means (4) for connecting the rod bodies adjacent to each other.
3), (44) and the outer circumference of the rod body (1a),
A plurality of fluid conduits (10), (11) arranged so as to surround the rod body (1a) along the axial direction thereof.
And supporting means (4) for supporting these fluid conduits.
3) and the rod bodies (1a) provided at both ends of each of the fluid conduits (10), (11) ...
Second connecting means (10) for connecting the fluid conduits (10), (11) ...
a), (11a) ...

Each of the fluid conduits has a flexible hose (1
0), (11) ...

The first coupling means includes flanges (43), (43) provided at both ends of the rod body, and the flanges (43), () of the rod bodies (1a), (1a) adjacent to each other. 43) fixing means (44) for fixing each other, and the supporting means comprises the flange (43).

The second coupling means includes the flange (4
3) and a plurality of joint holes (3) provided in the flanges (43), (43) corresponding to the fluid conduits (10), (11), ... 47)
Consists of.

[0023]

A plurality of fluid conduits are connected every time the rod bodies are connected. Since the fluid conduits are arranged so that they do not enclose each other, the outer diameter of each fluid conduit is much smaller than the outer diameter of the rod body, and only a small spanner is required to connect the fluid conduits. Therefore, the torque is smaller than that of the conventional multiple pipe system, and the alignment is easy. In addition, the boring rod in which the fluid conduit is a flexible hose is light in weight.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The boring rod referred to in the present invention is a concept including both for excavating only, for injecting the improving material, and for performing both excavating and injecting the improving material.

First Embodiment This embodiment is an embodiment in which the boring rod is used only for injecting the improving material. FIG. 1 is a cross-sectional view showing a tip portion of a boring rod to which a large number of rods are connected.

A monitor rod 2 is connected to the boring rod 1 at the tip, and the structure of the monitor rod 2 itself is known. The boring rod 1 of this embodiment is not used for excavation, but is used for injecting a quick-setting agent into the already excavated ground and for injecting an improving material such as cement milk at a high pressure. For this reason, the monitor rod 2 is provided with a quick-setting admixture nozzle 3 at its tip, and behind it a cement milk nozzle 4 and an air nozzle 5 for injecting cement milk at high pressure.

A mud suction port 6 for sucking and discharging slime is provided behind the cement milk nozzle 4, and an air nozzle 7 for jetting air for giving discharge energy to the slime is opened near the mud suction port 6. is doing. A pressure sensor 8 is provided between the quick setting agent nozzle 3 and the cement milk nozzle 4, and the pressure detected by the hole 9 is taken into the pressure sensor 8.

The quick-setting agent nozzle 3, the cement milk nozzle 4, the high-pressure injection air nozzle 5, and the slime discharge air nozzle 7 have hoses 10 and 13 (only some hoses are shown in FIG. 1). The respective fluids are supplied via the hose 14 and the slime sucked from the mud suction port 6 is also discharged to the outside of the drill hole through the hose 14. Further, the signal detected by the pressure sensor 8 is also sent to the ground via the cable 15.

2 and 3 show the arrangement of the hoses and the signal cables, FIG. 2 is a development view, and FIG. 3 is a sectional view taken along the line AA of FIG.

In this embodiment, each hose and signal cable are arranged inside the boring rod 1. The rod body 1a is made of a steel pipe like the conventional boring rod. The boring rods 1 and 1 adjacent to each other are connected to each other by inserting one end portion of one rod body 1a into the other rod body 1a and screwing bolts into bolt holes 16a and 16b formed in peripheral walls of both end portions. It

The hose 10 is a quick-setting agent, the hose 11 is cement milk, the hose 12 is air for high pressure injection, and the hose 1 is
Reference numeral 3 is for supplying air for discharging slime. The hose 14 is for discharging slime. The cable 15 is for sending a pressure detection signal.

The hoses 10 to 14 constituting the fluid conduit are
It is a flexible hose similar to that for hydraulics, and has hexagon nut-attached coupling fittings 10a to 14a provided at both ends.
The hoses adjacent to each other are connected to each other through the hexagon nut-equipped joint fittings 10b to 14b. Signal cable 15
Connectors 15a for coupling are also provided at both ends of.

The hoses 10 to 14 and the cable 15 have lengths corresponding to the rod body 1a, and the hoses 10 to 14 and the cable 15 are connected each time the rod body 1a is connected. According to this embodiment, since the hose is used as the fluid conduit, the total weight of the boring rod is light. The connection of the hose is simple because it is sufficient to use two spanners and rotate only the hexagon nut. Aligning the hoses with each other is also easy because it is done individually.

State of Use FIG. 21 shows an example of a procedure for ground improvement using the above boring rod. In this example, the ground is excavated horizontally to improve the ground.

First, while preventing the collapse of the hole wall by the casing 30, the horizontal hole 33 is excavated in the ground by the ordinary boring rod 32 having the excavation bit 31 at the tip (FIG. 21 (a)), and when the planned excavation length is reached. The boring rod 32 is pulled out leaving only the casing 30 (FIG. 21B).

Next, a plurality of boring rods 1 according to the present invention having a monitor rod 2 at the tip are inserted into the casing 30 while being connected (FIG. 21 (c)). At that time, each time the rod body 1a is connected, the hoses 10-14
And the cable 15 are connected.

After setting the boring rod, the casing 30 is pulled out by the improvement range S. And hose 1
A predetermined fluid is supplied to 0 to 13 and the boring rod is oscillated and rotated to be ejected from each of the nozzles 3, 4, 5 and 7 and injected into the ground to form an improved ground layer. Further, at that time, the slime sucked from the mud suction port 6 is discharged through the hose 14 (FIG. 21 (d)).

Second Embodiment FIGS. 4 to 6 show a second embodiment. This embodiment is also an embodiment in which the boring rod is used only for injecting the improving material.

FIG. 4 is a sectional view in the axial direction of the rod, and FIGS. 5 and 6 are sectional views taken along the lines BB and CC of FIG. 4, respectively. In this embodiment, unlike the first embodiment, steel pipes 20 to 25 are used as fluid conduits. The pipes 20 to 25 are arranged so as not to include each other inside the rod body 1a as in the first embodiment.

The pipe 20 is a quick-setting agent, the pipe 21 is cement milk, the pipe 22 is air for high pressure injection, and the pipe 2 is
Reference numeral 3 is for supplying air for discharging slime. The pipe 24 is for discharging slime. The pipe 25 is for supplying high-pressure water in addition to air for discharging slime.

A fixing ring 26 having a predetermined thickness is fixed to both ends of the rod body 1a, and a joint rod 27 is fixed to each fixing ring 26 with a bolt 28. Each joint rod 27 has a joint hole 2 corresponding to the pipes 20 to 25.
0a to 25a are formed. Each joint hole 20a-25
The ends of the pipes 20 to 25 are liquid-tightly or airtightly connected to a via an O-ring 29.

The connection between the bowling rods 1 and 1 is
The O-ring 35 is arranged around the inlet of each joint hole of the one joint rod 27, and then the end surface of the joint rod 27 of the one rod body 1a and the joint rod 2 of the other rod body 1a.
Butt the end face of No. 7 with bolt 36
This is done by combining 7,27.

According to this embodiment, each pipe 20-25
Since it is pre-mounted and unitized, the pipes are connected at the same time by only connecting the rod bodies, and there is no need to connect the pipes individually.

Third Embodiment FIGS. 7 to 9 show a third embodiment. This embodiment is an improvement of the above-mentioned second embodiment. Figure 7
Is a sectional view in the axial direction, and FIG. 8 is a sectional view taken along line JJ of FIG. 7. The third embodiment differs from the second embodiment in the following structure.

Each joint hole of the one joint rod 27 (in FIG. 7, joint holes 22a, 2 for high pressure jet air and slime discharge)
4a only) is provided with a coupling having an O-ring 39 on the outer periphery (for high pressure injection air in FIG. 7,
(Only the couplings 22c and 24c for discharging slime are shown). The boring rods 1 and 1 are connected to each other by inserting the couplings 22c and 24c and other couplings into the joint holes 22c and 24c of the other joint rod 27,
This is done by fastening the bolt 36 as in the second embodiment.

Since the joint holes of both joint rods 27, 27 communicate with each other through the coupling, the liquid tightness is improved. Further, in this embodiment, in order to prevent the slime from scattering from the joint hole 24a when the boring rod is separated, a slime discharge port 50 is provided on the peripheral wall of the tip end portion of the other joint rod 27. The slime discharge port 50 opens into the joint hole 24a for discharging slime.

The slime discharge port 50 is closed by the coupling 24c when the boring rod is connected. When disconnecting the boring rod, the bolt 36 is removed, and the boring rod 1 is removed as shown in FIG.
When is gradually separated, the slime discharge port 50 opens.
As a result, the slime accumulated in the slime flow paths 24, 24a is discharged from the slime discharge port 50. After the slime is completely discharged, the boring rod 1 is completely cut off.

As described above, by providing the slime discharge port 50, other couplings are soiled by slime, and the discharge port is clogged by entering other flow channels, especially the air flow channels 22 and 23. The trouble of can be prevented.

Fourth Embodiment FIGS. 10 to 12 show a fourth embodiment. This embodiment is also an embodiment in which the boring rod is used only for injecting the improving material.

FIG. 10 is an axial sectional view, and FIGS. 11 and 12.
11A and 11B are cross-sectional views taken along lines DD and EE of FIG. 10, respectively. In this embodiment, the fixing ring 26 as in the second embodiment is not provided, and the joint rods 27, 27 are directly fixed to the rod body 1a.

One joint rod 27 has a rod body 1
A recess 37 extending in the axial direction of a is formed. The cross-sectional shape of the recess 37 is substantially polygonal from the entrance to the middle portion, and is circular from the middle portion to the inner portion. On the other joint rod 27, a convex portion 38 that can be fitted in the concave portion 37 is formed extending in the axial direction of the rod body 1a.

At the tip of the convex portion 38 of the other joint rod 27, the coupling 2 communicating with the joint holes 20a to 25a is formed.
0b to 25b are provided and their coupling 20b is provided.
An O-ring 39 is provided around 25b.

The connection between the bowling rods 1 and 1 is
The recess 37 of the joint rod 27 of one rod body 1a,
The convex portion 38 of the joint rod 27 of the other rod body 1a is fitted, the pin is inserted into the pin insertion hole 40, and the screw hole 41
Made by joining screws to. The same members as those of the second embodiment are designated by the same reference numerals and the description thereof will be omitted.

According to this embodiment, as in the second embodiment, the pipes 20 to 25 are preliminarily mounted and unitized, so that the pipes are joined together by connecting only the rod bodies. There is no need to combine them individually.

Fifth Embodiment FIGS. 13 to 15 show a fifth embodiment. This embodiment is also an embodiment in which the boring rod is used only for injecting the improving material. 13 is a plan view, and FIGS. 14 and 15 are cross-sectional views taken along line FF and line GG in FIG. 13, respectively.

In this embodiment, a hose is used as the fluid conduit as in the first embodiment, but the hoses 10 to 1 are used.
3, 42 and the signal cable 15 are arranged on the outer periphery of the rod 1a at intervals in the circumferential direction (within the range of the chain line in FIG. 13). The space in the rod body 1a constitutes a flow path for discharging slime. The hose 42 is for supplying high-pressure water in addition to air for discharging slime, and is coupled by a coupling fitting 42a.

Flange 43, 4 is provided on both ends of the rod body 1a.
3 is provided. The boring rods 1 and 1 are connected to each other by joining the flange 43 of one rod body 1a and the flange 43 of the other rod body 1a with a bolt 44. Pin 45 is flange 4
3, 43 positioning pins.

A plurality of notches 46 are provided on the periphery of the flange 43 at intervals in the circumferential direction, and these notches 46 are provided.
Each hose is supported by. Each hose is a rod body 1
Every time a is connected, the flanges 43, 43 of one rod body 1a are connected.

According to this embodiment, in addition to the overall weight being light, the hose is located outside the rod body 1a, so that the hose can be moved freely, and the centering becomes easier.

Sixth Embodiment FIGS. 16 to 19 show a sixth embodiment. This embodiment is also an embodiment in which the boring rod is used only for injecting the improving material. 16 is a plan view, FIGS. 17 and 18 are cross-sectional views taken along the lines HH and I-I of FIG. 16, FIG. 19 is a cross-sectional view showing a connected state of the rod body, and FIG. 20 is a hose connection. It is sectional drawing which shows a state.

In this embodiment, the rod bodies 1a are connected to each other by joining the flanges 43, 43 provided at both ends thereof, and the space in the rod body 1a constitutes a flow path for discharging slime. And that each hose is arranged on the outer circumference of the rod body 1a, which is similar to the fourth embodiment.

However, it differs from the fifth embodiment in that the flange 43 is provided with a joint hole 47. That is,
The joint fitting of each hose is connected to the joint hole 47, and the adjacent flanges 43, 43 are joined together to form the joint hole 4
The hoses communicate with each other via 7,47.

FIG. 20 (a) is a cement milk, FIG.
20B shows communication between the hoses for supplying high-pressure jetting air, and FIG. 20C shows supplying slime discharging air and a quick-setting agent. Each hose has a flange 43
Besides, it is also supported by two flanges 48 provided at an intermediate portion of the rod body 1a.

According to this embodiment, each hose is unitized by mounting it on the rod body 1a in advance, so that only the rod bodies need to be connected, and it is not necessary to connect the hoses individually. .

Other Embodiments In the above, the embodiments in which the boring rod of the present invention is used only for injection of the improvement material have been described. However, the boring rod of the present invention is used only for excavation or for both excavation and injection of the improvement material. It is also applicable when performing.

Further, in the fifth and sixth embodiments in which the fluid conduit is arranged on the outer circumference of the rod body, the fluid conduit is a hose, but it may be a steel pipe.

The pipe is not limited to the one made of steel, but may be made of hard vinyl chloride or the like.

The type of fluid flowing through each hose or pipe in each of the above embodiments is merely an example, and is not limited to that of the embodiment.

[0069]

As described above in detail, according to the present invention, the connecting and disconnecting operations of the boring rod can be performed very easily in a short time, and the centering is easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a monitor rod connected to a boring rod at the tip.

FIG. 2 is a development view showing a first embodiment of a boring rod according to the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view showing a second embodiment.

5 is a cross-sectional view taken along the line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a sectional view showing a third embodiment.

8 is a cross-sectional view taken along the line JJ of FIG.

FIG. 9 is a cross-sectional view showing a state when the boring rod is separated.

FIG. 10 is a sectional view showing a fourth embodiment.

11 is a cross-sectional view taken along the line DD of FIG.

12 is a cross-sectional view taken along the line EE of FIG.

FIG. 13 is a sectional view showing a fifth embodiment.

FIG. 14 is a cross-sectional view taken along the line FF of FIG.

FIG. 15 is a cross-sectional view taken along the line GG of FIG.

FIG. 16 is a sectional view showing a sixth embodiment.

17 is a cross-sectional view taken along the line HH of FIG.

FIG. 18 is a cross-sectional view taken along the line I-I of FIG. 16.

FIG. 19 is a cross-sectional view showing a connected state of the rod body.

FIG. 20 is a cross-sectional view showing a connected state of each hose.

FIG. 21 is an explanatory diagram showing a usage state.

[Explanation of symbols]

 1 ... Boring rod 1a ... Rod main body 10, 11, 12, 13, 14 ... Hose

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Nakajima 3-1-2, Tsubuhoncho, Nishi-ku, Osaka City, Osaka Prefecture Tokiwa Construction Co., Ltd. (72) Inventor Norio Tanaka 1534 Hara, Karatsu-shi, Saga Yoshida Tetsudo Co., Ltd. Inside the factory

Claims (10)

[Claims] 1. A boring rod (1) which is axially connected to a plurality of rods and penetrates into the ground. And first connecting means (16a), (16b) for connecting the rod bodies adjacent to each other, and arranged inside the rod body (1a) so as not to include each other along the axial direction thereof. A plurality of fluid conduits (10), (11) ..., and the rod bodies (1a), (1a) provided at both ends of each of the fluid conduits (10), (11).
Second coupling means (10a), (1) for connecting the fluid conduits (10), (11) ...
1a) ... and a boring rod. 2. The boring rod according to claim 1, wherein each of the fluid conduits comprises flexible hoses (10), (11). 3. The boring rod according to claim 1, wherein each fluid conduit comprises a rigid pipe (20), (21), .... 4. The first coupling means according to claim 1,
Joint parts (27) provided at both ends of the rod body,
(27) and fixing means (36) for fixing the joint portions (27), (27) of the rod bodies (1a), (1a) adjacent to each other, wherein the second coupling means is , The joint part (27), (27)
And these joint portions (27), (27) are provided corresponding to the respective fluid conduits (20), (21) ... And the ends of the respective fluid conduits (20), (21). A boring rod comprising a plurality of joint holes (20a), (21a) ... 5. The coupling holes (20a), (21a) of the boring rods connected to each other according to claim 4, wherein the coupling holes (20c), (21c) provided in one of the coupling holes for communicating with each other. 24c), one of the fluid conduits (20), (21) ... Is a fluid conduit for slime discharge (24), and the other joint hole (24a) constituting a part of the flow path for slime discharge. ) Is provided in the other joint part (27), and the slime outlet (50) is closed by the coupling (24c) when the boring rod is connected. 6. The joint portion (27) according to claim 4,
One of the joints (27) is formed with a recess (37) extending in the axial direction of the rod body (1a), and the other joint (27) is fitted into the recess (37). Boring rod having a convex portion (38) formed therein. 7. A boring rod (1) which is axially connected to a plurality of rods and penetrates into the ground, the rod main body (1a) made of a rigid pipe, and the rod main body (1a) provided at both ends of the rod main body (1). First coupling means (4) for coupling the adjacent rod bodies.
3) and (44), and a plurality of fluid conduits (10), (11), which are arranged on the outer periphery of the rod body (1a) so as to surround the rod body (1a) along the axial direction thereof. And support means (43) for supporting these fluid conduits
And the rod bodies (1a), (1a) provided at both ends of each of the fluid conduits (10), (11) ...
Second coupling means (10a), (1) for communicatively connecting the fluid conduits (10), (11) ...
1a) ... and a boring rod. 8. A boring rod according to claim 7, wherein each of said fluid conduits comprises flexible hoses (10), (11). 9. The method according to claim 7, wherein the first coupling means is
Flanges (43) provided at both ends of the rod body,
(43) and fixing means (44) for fixing the flanges (43), (43) of the rod bodies (1a), (1a) adjacent to each other, and the supporting means comprises the flange (43). A bowling rod consisting of 43). 10. The method according to claim 9, wherein the second coupling means corresponds to the flange (43) and the flanges (43) and (43) to the fluid conduits (10), (11). And a plurality of joint holes (47) to which the ends of the respective fluid conduits are connected.