JP3095374B2 - Propulsion pipe for lubricant injection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art Conventionally, a propulsion excavation method for excavating the ground while applying a propulsive force to an excavator has been known. The present invention relates to a lubricant injection propulsion pipe used in the propulsion excavation method.

[0002]

2. Description of the Related Art In a propulsion excavation method, a required number of propulsion pipes are connected and interposed between an excavator and a main pushing device, and the number of propulsion pipes is successively increased as excavation progresses. Will be In addition, in order to reduce the propulsion resistance between these drilling rigs and the ground, lubricant is ejected from the inside of some propulsion pipes to the outside, and the lubricant is discharged between the drilling rig and the ground. I try to inject it.

FIGS. 24 (a) and 24 (b) show a conventional lubricant injection propulsion tube 1 used in such a construction method. The propulsion pipe 1 is provided with a steel-made joint pipe 3 at one end of a fume pipe 2 having a predetermined length, and a one-step smaller-diameter fitting portion 4 fitted into the joint pipe 3 of another propulsion pipe at the other end. Lubricant injection holes 5 are provided radially on the same row in the circumferential direction of the fume tube 2 at a required interval.

When the propulsion method is performed using the above-described propulsion pipe 1, a lubricant pressure feeding hose 6 is inserted in a length direction thereof, and a distribution hose 7 connected to the pressure feeding hose 6 is disposed in a circumferential direction. The distribution hose 7 is provided with a nozzle 8 fixed to the lubricant injection hole 5. The lubricant fed through the pressure feeding hose 6 is distributed from the distribution hose 7 through the nozzle 8 and is also ejected to the outside from the lubricant injection hole 5 as shown by an arrow, thereby forming a gap between the outer peripheral surface of the propulsion pipe 1 and the ground 9. Is injected into the gap 11 between them.

[0005]

In the fume tube 2 constituting the lubricant injection propulsion tube 1 as described above, a reinforcing bar 12 is spirally disposed around the shaft bar 13 and the shaft bar 13. The screw 14 to be formed is embedded.

However, when the above-mentioned lubricant injection hole 5 is formed in the fume tube 2, in order to avoid interference with the reinforcing steel bar 12, a part of the thread 14 or a part of the screw 14 is sometimes prepared before the fume tube 2 is manufactured. It is necessary to cut and remove a part of the shaft 13. For this reason, the lubricant injection propulsion tube 1 has a significantly reduced shear resistance at the portion of the lubricant injection hole 5.

When such a propulsion pipe 1 is used in an actual propulsion method, when the propulsion force acts on a curved portion of excavation, the propulsion pipe 1 may be sheared and broken by the component force.

The lubricant injected into the ground from the lubricant injection pipe 5 of the propulsion pipe 1 is injected at a high pressure higher than the groundwater pressure in order to prevent the backflow of the groundwater. Parts collapse, increasing propulsion resistance,
Adverse effects such as significantly impairing the performance of the lubricant due to the incorporation of collapsed soil are brought about.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lubrication injection propulsion pipe which reinforces the above-mentioned propulsion pipe and prevents collapse of the ground due to lubricant injection.

[0010]

In order to achieve the above-mentioned object, the present invention provides a fume pipe having a predetermined length, in which lubrication holes are provided on the same row in a required number of circumferential directions, and the fume pipe is inserted through the lubrication hole. In a lubricant injection propulsion pipe that is configured to inject lubricant into an external excavation ground, a ring-shaped steel plate having a width covering the lubricant injection hole and the vicinity thereof is provided on the outer peripheral surface of the fume pipe at the lubricant injection hole portion. Integrally provided, a groove is formed on the outer peripheral surface of the steel plate so as to match the row of the lubricant injection holes, an opening is provided in the groove so as to match the lubricant injection hole, and the baffle plate extending over the opening is formed on the steel plate. Is provided for each opening,
An outflow gap is provided between the baffle plate and the groove.

A configuration may be adopted in which the lubricant injection holes are provided on two rows in the circumferential direction, and two rows of grooves corresponding to the rows are formed in the steel plate.

[0012] With the above construction, the portion of the fume tube where the reinforcing steel is cut is reinforced by a grooved steel plate, and the lubricant ejected from the lubricant injection hole collides with the baffle plate to reduce the ejection power. It is reduced, and then flows out along the groove from the outflow gap between the baffle plate and the groove bottom, and is injected into the ground.

Further, the front edge of the baffle plate as viewed in the propulsion direction is integrally fixed to the upper end edge of the groove in the front position as viewed in the same propulsion direction, and A configuration in which an outflow gap is formed between the end edge and the upper end edge at the rear of the groove may be employed.

According to the above configuration, the lubricant that has collided with the baffle plate is not only flown out to the outside along the groove, but also flows out backward from the flow-out gap on the rear end side of the baffle plate in the propulsion direction.

Further, the joint pipe attached to one end of the fume pipe may also serve as the steel plate, or the steel pipe may be integrally provided at the inner end of the joint pipe attached to one end of the fume pipe. It is also possible to adopt a configuration that is different.

Furthermore, of the baffles provided over the entire width of the groove corresponding to each of the openings, a closing portion of the outflow gap is provided at one end of the baffle of the opening at a predetermined position, and is opposed to the closing portion. A configuration in which the end on the side is formed by a long baffle plate extending in the circumferential direction by a predetermined length can be adopted.

In addition, the interval A between two predetermined lubricant injection holes is set to be larger than the interval B between the other lubricant injection holes, and openings corresponding to these lubricant injection holes are provided in the steel plate. The two lubricant injection holes sandwiching the space A of the former and the baffles provided corresponding to the openings corresponding thereto are formed by the long baffles, and between the open ends of the long baffles. Is set to the latter interval B described above.

Further, a lubricant distribution passage for distributing lubricant to the lubricant injection hole is provided inside the thickness of the fume tube, and a connecting portion between the lubricant feeding hose and the lubricant distribution passage is provided in the fume tube. And a configuration in which the lubricant distribution passage is constituted by a distribution pipe having a branch tube connected to each of the lubricant injection holes, or by a passage member integrally provided on the inner peripheral surface of the steel plate. Can also be taken. Further, the fume tube may be provided with a pressure sensor for detecting the pressure acting on the outer peripheral surface.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 (a)
(B) As shown, the lubricant injection propulsion tube 1 of the first embodiment.
In the same manner as in the conventional case, a joint pipe 3 is slightly protruded in the axial direction at one end of a fume pipe 2 having a predetermined length and provided integrally therewith, and the other end is fitted with a joint pipe 3 of another propulsion pipe 1 at a one-step small diameter. Is provided.

A required number of lubricant injection holes 5 are provided in a row in the body of the fume tube 2 at regular intervals in the circumferential direction. The lubricant injection hole 5 is, as shown in FIGS. 3 and 4,
A frustoconical portion 16 is provided at the inner end thereof, and a cylindrical body 22 is formed on the frustoconical portion 16 so as to communicate therewith.

In the above-mentioned lubricant injection hole 5, a portion of the reinforcing steel bar 12 which interferes with the lubricant injection hole 5 is cut and removed in advance.
In this case, a case is shown in which a part of the shaft 13 and the thread 14 is cut off (see a portion a in FIG. 3).

A ring-shaped reinforcing steel plate 18 including the lubricant injection hole 5 and having a width enough to cover the cut-out portion of the reinforcing reinforcing bar 12 is integrally mounted on the outer peripheral surface of the fume tube 2. The reinforcing steel plate 18 has a groove 19 indented inward at the center in the width direction over the entire circumference by roll molding, thereby increasing the reinforcing strength. The groove 19 is formed at a position corresponding to the lubricant injection hole 5 and has a width equal to or larger than the diameter of the lubricant injection hole 5.

Each of the above-mentioned grooves 19 is provided with each of the above-mentioned lubricant injection holes 5.
Is formed, and the cylindrical body 22 forming the lubricant injection hole 5 is fixed to the inner surface of the opening 21 by welding. A screw portion 23 is provided on the inner peripheral surface of the lower end of the cylindrical body 22.

Further, above the opening 21 of the groove 19,
A square baffle 24 having a width equal to or slightly larger than the diameter of the opening 21 is attached.

As shown in FIGS. 2 and 3, the baffle plate 24 is fixed in the form of a bridge between the upper edges on both sides of the groove 19 at the upper portion of the opening 21 so as to cover the upper portion of the opening 21. The baffle plate 24 and the groove 1 on both sides of the plate 24
The gaps 25, 25 for the lubricant are provided between the base 9 and the bottom (see FIG. 4).

When manufacturing the lubrication injection propulsion pipe 1 of the first embodiment described above, the reinforcing reinforcing bar 12 corresponding to the lubrication injection hole 5 is cut off and the cylindrical body 2 is prepared in advance.
2 and the joint pipe 3, the frusto-conical section 1
The core 6 is attached to a predetermined position of a mold, and is manufactured by a well-known centrifugal molding method.

When the above-mentioned lubricant injection propulsion pipe 1 is used for the propulsion excavation method, as shown in FIG.
6 and 26, the distribution hose 7 connected to the lubricant pressure feeding hose 6 is moved along the inner peripheral surface, and each lubricant injection hole 5
The nozzle 8 of the distribution hose 7 is screwed into the screw portion 23 of the cylindrical body 22 (see the dashed line in FIG. 3).

When high-pressure lubricant is supplied through the pressure-feeding hose 6, the lubricant is distributed from the distribution hose 7 through the nozzle 8 and squirts outward from the opening 21 of the lubricant injection hole 5. Outflow gap 2 on both sides
5 and 25 (see arrows in FIG. 6), and partly in the groove 19.
The other part flows into the gap 11 between the propulsion pipe 1 and the ground 9 by overflowing out of the groove 19, and reduces the propulsion resistance. At this time, since the lubricant is maintained at a sufficiently high pressure inside the lubricant injection hole 5, backflow of the groundwater does not occur.

As shown in FIGS. 7 (a) and 7 (b), in order to further integrate the reinforcing steel plate 18 and the concrete of the fume pipe 2, a large number of steel plates are provided on the inner surface of the reinforcing steel plate 18. It is desirable to provide the recess 28 of the above, or to provide a number of grooves or cross-shaped grooves.

In the lubricant injection propulsion tube 1 according to the second embodiment shown in FIGS. 8A and 8B, the baffle plate 24 partially covers the opening 21. That is, when the propulsion direction is the direction indicated by the arrow A, the front edge of the baffle plate 24 (the edge on the propulsion direction side) is fixed to the upper edge of the groove 19 on the propulsion direction side, and from the upper edge to the rear. The lubrication outlet gap 27 is provided between the rear end edge of the baffle plate 24 and the other upper end edge of the groove 19. Other configurations are the same as those described above.

According to the above configuration, as shown by the arrow in FIG. 8B, the lubricant can flow out not only in the circumferential direction of the groove 19 but also in the direction opposite to the propulsion direction.

The lubricant injection propulsion pipe 1 of the third embodiment shown in FIGS. 9A and 9B has the lubricant injection holes 5 dispersed and provided in two adjacent rows. Lubricant injection hole 5
Between the lubricant injection holes 5 in the other row,
It is provided in a so-called staggered manner.

The reinforcing steel plate 18 is also provided with two rows of grooves 19, 19 corresponding to each row of the lubricant injection holes 5, and each groove 1
A cylindrical body 22 corresponding to the lubricant injection hole 5 is fixed to 9 and 19, and a baffle plate 24 corresponding to the opening 21 is provided.
This baffle plate 24 is similar to that of the first or second embodiment. Also, the baffle plate 2 of the groove 19 at the front in the propulsion direction
4 spans both edges of the groove 19 as in the first embodiment,
The baffle plate 24 of the rear groove 19 may have a configuration in which an outflow gap 27 (see FIG. 8) is provided at the rear end edge as in the second embodiment.

The fourth embodiment shown in FIG.
Is also used as the reinforcing steel plate 18. In this case, a joint pipe 3 having two rows of grooves 29 is used for reinforcing itself. A lubricant injection hole 5 is provided so as to match the position of the inner groove 29, and the groove 2
A cylindrical body 22 corresponding to the lubricant injection hole 5 is fixed to the inner surface of the cylinder 9.

The groove 29 is provided with an opening 21.
The opening 21 is provided with the same baffle plate 24 as in the above embodiments. According to the above configuration, there is an advantage that the number of parts is reduced.

The fifth embodiment shown in FIG.
A reinforcing steel plate 18 similar to that of the above-described first to third embodiments is fixed to the inner end by welding or formed from a single steel plate from the beginning to be provided integrally.

According to the above configuration, the number of parts can be reduced, and the position of the lubricant injection hole 5 can be provided at least inward from the pipe end.

In the sixth embodiment shown in FIGS. 12 to 15, two lubricant injection holes 5 ', 5' provided at both ends of the distribution hose 7 and other lubricant injection holes 5, 5 'adjacent thereto are provided.
(The distance represented by the size of the central angle of the propulsion tube 1,
same as below. A) is set smaller than the interval B between the other lubricant injection holes 5. As a result, the distance C between the lubricant injection holes 5 'and 5' is larger than the distance B.

Openings 21 ', 21' are provided at positions corresponding to the lubricant injection holes 5 ', 5'.
The baffle provided corresponding to 21 ′ is a long baffle 30
(See FIG. 14). The opening 21 other than the above is provided with the above-mentioned ordinary baffle plate 24.

Each long baffle 30 is connected to another adjacent opening 2.
A closing portion 31 that closes the outflow gap 25 at the end on one side
(See FIGS. 14 and 15), and the end opposite to the closed portion 31 is extended to reach the position of the interval B from the adjacent opening 21 as shown in FIG. Outlet 25 'is formed. The distance between the outlets 25 'of both long baffles 30 is B. Accordingly, the distance between all the openings 21 and the outlets 25 'is B.

When the lubricant is distributed through the pressure feeding hose 6, the distribution hose 7 and the cylindrical body 22 of the lubricant injection propelling tube 1, and the high-pressure lubricant is ejected from the openings 21 and 21 ', the lubricant is ejected from the opening 21. The lubricant collides with the baffle 24 and flows out in the same manner as described above. Further, since one of the outflow gaps 25 is closed by the closing portion 31, the entire amount of the lubricant that has collided with the long baffle plate 30 flows through the other outflow gap 25 and flows out from the outlet 25 ′.

As mentioned above, all openings 21 and outlets 2
Since the intervals of 5 ′ are all B, the lubricant eventually flows out at the same interval as when the lubricant injection holes 5 are provided at the interval B over the entire circumference.

As described above, the long baffle 30 has the opening 21 '.
Since the lubricant has an effect of flowing out of the lubricant at a position away from the vehicle, the lubricant can be flowed out from an arbitrary position by appropriately selecting its length.

When the distance C between the openings 21 (lubricant injection holes 5 ') is set at the bottom of the lubrication injection propulsion tube 1 as in the above embodiment, the lubrication injection propulsion tube 1 Since the portion of the space C is largely opened inside, it is possible to prevent a worker from stumbling with the distribution hose 7 or the nozzle 8 and to install a control cable and other piping in this portion. . In addition, in the case of the inner diameter of the lubricant injection propulsion tube 1, it is possible to run a truck or the like by laying a track on the above-mentioned portion.

In the seventh embodiment shown in FIGS. 16 to 18, a distribution pipe 32 is buried inside the fume tube 2 instead of the distribution hose 7 of each of the above-described embodiments, and the distribution pipe 32 has a peripheral pipe. The branch cylinders 33 are connected at predetermined intervals in the direction. The inside of the distribution pipe 32 is a lubricant distribution passage 34.
Thus, the inside of the branch cylinder 33 becomes the lubricant injection port 5 communicating with the lubricant distribution passage 34 (see FIG. 18B). Branch tube 3
3 is fixed to the opening 21 of the groove 19 by welding. The configuration of the groove 19 and the configuration in which the baffle plate 24 is provided in the opening 21 are the same as those in the first to fifth embodiments.

The distribution pipe 32 is provided with one connection cylinder 35 which forms a connection with the pressure hose 6 (FIG. 1).
8 (b)). The pressure feeding hose 6 is screwed into the screw portion 35 'of the connection tube 35.

The lubricant pressure-fed from the above-mentioned pressure-feeding hose 6 is supplied from the connection cylinder 35 and the lubricant distribution passage 34 to the lubricant injection hole 5,
It is ejected through the opening 21, collides with the baffle plate 24, and flows out of the outflow gap 25 on both sides thereof in the direction of the groove 19.

The groove 19 of the reinforcing steel plate 18 is used.
A mounting hole 36 is provided in another reinforcing groove 19 ′ in the vicinity (see FIG. 18D), and the pressure sensor 37 inserted from the inner peripheral surface of the fume tube 2 is inserted into the mounting hole 36, and The upper surface of the mounting hole 36 is covered with a protective plate 38 extending to the groove 19 '. The above-mentioned pressure sensor 37 is connected to the fume tube 2.
Screwed to the inner peripheral surface of

The above-mentioned pressure sensor 37 is used for detecting whether or not the pressure of the lubricant (sealing pressure) filled in the gap between the propulsion pipe 1 and the ground 9 has dropped due to interruption of the work or the like.

The connecting tube 35 is provided on the side of the distribution pipe 32 as shown in a modification of FIG.
The lubricant distribution passage 34 may communicate with the communication tube 39 (see FIG. 19B). This configuration corresponds to FIG.
It is suitable for the case where the thickness of the fume tube 2 is thinner (that is, the case where the tube diameter is small) as compared with the seventh embodiment shown in FIGS.

Also, as in the modification shown in FIG. 20, distribution pipes 32 are provided inside the fume pipe 2 on the side of the groove 19, and a lubricant injection pipe 41 is connected to each distribution pipe 32. The distal end is bent outward, and the bent end is connected to the opening 21 of the groove 19.
The connection pipe 35 for connecting to the pressure hose 6 is provided on the distribution pipe 32. This case is also suitable for the case where the thickness of the fume tube 2 is small as in the modification of FIG.

In the eighth embodiment shown in FIGS. 21 (a) to 21 (d), a passage member 42 having a U-shaped cross section is fixed to the inner peripheral surface of the back surface of the groove 19 of the reinforcing steel plate 18 by welding, and the passage member is provided. 4
2, a lubricant distribution passage 34 is provided over the entire circumference.

One connecting cylinder 35 opened on the inner peripheral surface of the fume tube 2 is provided on the bottom surface of the passage member 42, and the pressure hose 6 is screwed into a screw portion 35 ′ of the connecting cylinder 35. The openings 2 are formed in the groove 19 at predetermined intervals in the circumferential direction.
1 is provided, and a baffle plate 24 facing the opening 21 is provided. This opening 21 also serves as a lubricant injection port. Instead of the baffle 24 described above, the long baffle 30 described above may be used. This case is also suitable for the case where the thickness of the fume tube 2 is thin, as in the modification of the seventh embodiment shown in FIGS. Of course, it can be applied to the case where the thickness is large.

When the thickness of the fume tube 2 is thin, FIG.
As shown in FIG.
Can be provided. The connection tube 43 is provided with a screw portion 43 ′. Further, as shown in FIG. 23, the connecting cylinder 43 may be interposed between both ends of the passage member 42 described above.
The upper end of the connection tube 43 is formed in an arc shape so as to follow the arc of the lower surface of the groove 19 of the reinforcing steel plate 18, and a notch 45 communicating with the inside of the passage member 43 and the lubricant distribution passage 34 is formed at two opposing positions on the peripheral wall. Provided. It should be noted that the baffle plate 24 is provided so as to face the opening 21 of the groove 19 as in the above-described embodiments.

In the eighth embodiment shown in FIGS. 21 to 23, the passage member 42 may have a U-shaped cross section.

In the seventh and eighth embodiments (FIGS. 16 to 23), the reinforcing steel plate 18 is formed integrally with the joint pipe 3, but these are separate bodies (FIG. 1).
Reference).

Further, in each of the above embodiments, after the lubricant injection operation is completed, the screw portion 23 of the cylindrical body 22 and the connecting cylinder 3
A plug (not shown) is screwed into each of the threaded portions 35 ′ and 43 ′ of 5 and 43, and is further filled with mortar.

[0058]

As described above, according to the present invention, the fume tube has a high shearing resistance because the grooved steel plate covers and reinforces the cut portion of the reinforcing bar.

Further, since the lubricant collides with the baffle plate and flows out, the collapse of the ground can be prevented, and the lubricant can be guided by the groove, so that the gap between the ground and the outer peripheral surface of the propulsion pipe is formed. , Can spread the lubricant sufficiently.

Further, even if the lubricant injection propulsion tube has a portion that comes into contact with the ground due to depressurization of the lubricant or correction of the direction of the propulsion, the lubricant injection hole in that portion is covered by the baffle plate to secure the outflow gap. Therefore, the injection of the lubricant is not hindered.

Furthermore, when a long baffle plate is used in which one end of the baffle plate is closed and the other end of the baffle plate is extended by a predetermined length, a lubricating passage is not provided in the thick portion of the lubricant injection propulsion tube, and the lubricating agent is not provided. A lubricant outlet can be easily provided at a position circumferentially separated from the lubricant injection hole on the inner peripheral surface side of the injection propulsion pipe.

Thus, the position of the lubricant injection hole in the lubricant injection propulsion pipe is shifted from a predetermined position to improve the workability in the lubricant injection propulsion pipe, while the outlet side is positioned from the bottom of the lubricant injection propulsion pipe. At a desired position so as not to hinder the injection of the lubricant.

Further, when the lubricant distribution passage is formed inside the thick part of the fume tube, it is not necessary to provide a hose for distributing the lubricant inside the fume tube. Further, by forming the lubricant distribution passage by a passage portion fixed to the back surface of the steel plate, the manufacturing and assembling properties are improved, and it is particularly effective when the thickness of the fume tube is small.

[Brief description of the drawings]

1A is a partially cutaway perspective view of a first embodiment, and FIG.

FIG. 2 is a partial perspective sectional view of the above.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view at the time of construction.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

7A is a partial cross-sectional view of a modification of the above embodiment, and FIG.

8A is a partial cross-sectional view of the second embodiment, and FIG.

9A is a partial plan view of the third embodiment, and FIG. 9B is an enlarged sectional view of FIG.

FIG. 10 is a partial cross-sectional view of the fourth embodiment.

FIG. 11 is a partial cross-sectional view of the fifth embodiment.

FIG. 12 is a sectional view of a sixth embodiment.

FIG. 13 is a partially cutaway perspective view of the above.

FIG. 14 is a partially enlarged sectional view of the above.

FIG. 15 is a partial perspective sectional view of the above.

FIG. 16 is a sectional view of a seventh embodiment;

FIG. 17 is a sectional view taken along line XX of FIG. 16;

18 (a) is a partial plan view of the same, (b) is a cross-sectional view taken along line bb in FIG. (A), (c) is a cross-sectional view taken along line cc in FIG. Sectional view of line dd

19A is a partial plan view of a modification of the above embodiment. FIG. 19B is a cross-sectional view taken along line bb in FIG. 19A. FIG. 19C is a cross-sectional view taken along line cc in FIG. a) Cross-sectional view taken along line dd in FIG.

20A is a partial plan view of another modification of the above embodiment. FIG. 20B is a cross-sectional view taken along line bb in FIG. 20A. FIG. 20C is a cross-sectional view taken along line cc in FIG.

21A is a perspective sectional view of an eighth embodiment. FIG. 21B is a sectional view taken along line cc in FIG. 21C. FIG. 21D is a sectional view taken along line cc in FIG. Sectional view

FIG. 22 (a) is a partial perspective view of a modification of the above, and (b) is a sectional view of the same.

FIG. 23 (a) is a partial perspective view of another modification of the above embodiment (b) is a cross-sectional view of the above modification (c) (b) is a cross-sectional view taken along line cc in FIG.

24A is a partially cutaway perspective view of a conventional example. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Fume pipe 3 Coupling pipe 4 Fitting part 5, 5 'Lubricant injection hole 6 Pumping hose 7 Distribution hose 8 Nozzle 9 Ground 11 Gap 12 Reinforcing reinforcing bar 13 Shaft 14 Thread 16 Conical portion 18 Reinforced steel plate 19 19 'groove 21, 21' opening 22 cylindrical body 23 screw part 24 baffle plate 25 outflow gap 25 'outlet 26 propulsion pipe 27 outflow gap 28 recess 29 groove 30 long baffle plate 31 closing part 32 distribution pipe 33 branch cylinder 34 lubricant Distribution passage 35 Connection tube 35 'Screw portion 36 Mounting hole 37 Pressure sensor 38 Protective plate 39 Communication tube 41 Lubricant injection pipe 42 Passage member 43 Connection tube 43' Screw portion 45 Notch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP 7-38466 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 311

Claims (11)

(57) [Claims] A lubricant injection hole is provided in a predetermined length of a fume pipe on the same row in a required number of circumferential directions, and lubricant is injected from the lubricant injection hole into an excavation ground outside the fume pipe. In the propulsion pipe, a ring-shaped steel plate having a width covering the lubricant injection hole and the vicinity thereof is integrally provided on the outer peripheral surface of the fume tube in the lubricant injection hole portion, and the row of the lubricant injection hole is formed on the outer peripheral surface of the steel plate. A groove that matches the lubricant injection hole is provided in the groove, a baffle plate extending over the opening is provided in the steel plate for each opening, and a gap between the baffle plate and the groove is provided. A propellant tube for injecting a lubricant, characterized in that an outflow gap is provided in the propulsion tube. 2. The lubricant injection hole according to claim 1, wherein the lubricant injection holes are provided on two rows in the circumferential direction, and two rows of grooves corresponding to the rows are formed in the steel plate. Propulsion pipe. 3. The joint pipe attached to one end of the fume pipe also serves as the steel plate.
Or the propulsion tube for lubricant injection according to 2. 4. The lubricant injection propulsion pipe according to claim 1, wherein said steel plate is integrally provided at an inner end of a joint pipe attached to one end of said fume pipe. 5. A front edge of the baffle plate as viewed in the propulsion direction is integrally fixed to an upper end edge of the groove in a front position as viewed in the propulsion direction. 5. The propulsion pipe for lubricant injection according to claim 1, wherein an outflow gap is formed between an end edge of the groove and an upper end edge of a rear side of the groove. 6. A baffle plate provided over the entire width of the groove corresponding to each of the openings, a blocking portion of the outflow gap is provided at one end of the baffle plate of the opening at a predetermined position, and a side opposite to the blocking portion. 5. The lubricant injection propulsion pipe according to claim 1, wherein the end portion is formed by a long baffle plate extending a predetermined length in a circumferential direction. 7. A distance C between two adjacent predetermined lubricant injection holes is set to be larger than a distance B between the other lubricant injection holes, and an opening corresponding to each of the lubricant injection holes is provided in the steel plate. The two lubricant injection holes sandwiching the interval C of the former and the baffles provided corresponding to the openings corresponding thereto are formed by the long baffles, and between the outlets of the long baffles. The lubrication injection propulsion pipe according to claim 6, wherein the interval is set to the latter interval B. 8. A lubricant distribution passage for distributing lubricant to the lubricant injection hole is provided inside the thickness of the fume tube, and a connecting portion between a lubricant feeding hose and the lubricant distribution passage is provided in the fume tube. The propellant tube for injecting a lubricant according to any one of claims 1 to 7, wherein: 9. The lubricant injection propulsion pipe according to claim 8, wherein said lubricant distribution passage is constituted by a distribution pipe having a branch tube connected to each of said lubricant injection holes. 10. The lubricant injection propulsion pipe according to claim 8, wherein said lubricant distribution passage is constituted by a passage member integrally provided on an inner peripheral surface of said steel plate. 11. The lubricant injection propulsion pipe according to claim 1, wherein the fume pipe is provided with a pressure sensor for detecting a pressure acting on an outer peripheral surface of the fume pipe.