JPH0949391A - Pit mouth packing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pit mouth packing device having a simple structure and excellent in the water stopping property. SOLUTION: The outer periphery section of a plate-like elastic packing member 9 is fitted to a pit mouth 3 formed on the pit wall of a vertical shaft 1. The inner periphery section of the elastic packing member 9 is expanded by a cutting edge pipe 8 at the tip of a conduit forming body such as a Hume pipe 7 or a segment or a leading apparatus such as a shield machine, and it is brought into slide contact with the outer peripheral face of the conduit forming body. Multiple ribs 10 are nearly radially arranged along the inner periphery section of the elastic packing member 9 on one side face of the elastic packing member 9, and the ribs 10 prevent the inner periphery section of the elastic packing member 9 from being inverted to the opposite side to the expanding direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wellhead packing device installed at a wellhead, and more particularly, to an inner peripheral surface of a wellhead and a drilling pit formed on the ground in communication with the wellhead. The present invention relates to a wellhead packing device for sealing between a pipe segment forming body such as a tunnel segment or a buried pipe.

[0002]

2. Description of the Related Art Conventionally, pits such as shafts and tunnels,
Alternatively, another excavation pit, for example, a tunnel pit, a vertical pit, or the like is constructed underground from a pit provided on the ground surface by a shield method or a propulsion method. In the shield method, pipes are formed in an excavated mine by sequentially performing an operation of assembling segments into a tubular shape or a partially open peripheral frame shape at a rear portion of an excavator for excavating the ground. In addition, in the propulsion method, the excavator or the bottom end of a buried pipe connected to the rear part of the cutting edge pipe is pressed by a propulsion machine, and the buried pipe is pressed into the ground while excavating or excavating the ground. By excavation, a pipeline is formed in the excavated mine.

Therefore, in both the shield method and the propulsion method, the space between the starting or reaching well of an excavator or the like and the outer peripheral surface of a pipe forming body such as a segment or a buried pipe is sealed, and the It is necessary to prevent the inflow of earth and sand, groundwater, etc. into the arrival pit.

A conventional wellhead packing device is, for example, as shown in Japanese Patent Application Laid-Open No. 48-76347, in which a tubular packing is mounted on the inner peripheral surface of a wellhead and a fluid is press-fitted into the tubular packing. Thus, the tubular packing is inflated and pressed against the outer peripheral surface of the conduit forming body or the outer peripheral surface of a leading device such as an excavator at the tip thereof.

[0005]

The conventional wellhead packing apparatus described above has a disadvantage that it requires a tubular packing having a complicated structure and is expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a wellhead packing device which is simple in structure and excellent in waterproofness.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a wellhead and a conduit forming body which is formed in an excavation well which is formed by being communicated with the wellhead. A wellhead packing device for sealing the space, wherein an outer peripheral portion is attached to the wellhole, and an inner peripheral portion is expanded by a leading device at a tip of the pipe passage forming body to form an outer peripheral surface of the pipe forming body. A plate-like elastic packing member which is slidably contacted with the elastic packing member, and a plurality of ribs are arranged substantially radially on one side surface of the elastic packing member along an inner peripheral portion of the elastic packing member. To do.

When the wellhead packing device having the above structure is applied to the wellhead on the leading device starting side, the inner peripheral portion of the elastic packing member is pushed and expanded to the side with the rib by the leading device starting from the wellhead, and the outer periphery of the leading device Sliding contact with the surface. At this time, since the ribs are arranged substantially radially along the inner peripheral portion of the elastic packing member, the rib does not hinder the pushing and spreading operation of the elastic packing member. Then, when the leading equipment further advances, the inner peripheral part of the elastic packing member slides on the outer peripheral surface of the conduit forming body disposed at the rear part of the leading equipment, so that the inner peripheral surface of the wellhead and the conduit forming body Seal between At this time, when the elastic packing member receives a pressure such as earth pressure or water pressure on the ground side, the pressure causes the inner peripheral portion of the elastic packing member to reverse, but is disposed on one side surface of the elastic packing member. Since the rib that is in contact with the vicinity of the mounting portion on the outer peripheral side of the elastic packing member, the rib functions as a stopper for preventing inversion, and prevents the elastic packing member from being inverted in the direction opposite to the expanding direction. Therefore, since the pressure on the ground side acts to press the inner peripheral portion of the elastic packing member against the outer peripheral surface of the conduit forming body, it is possible to seal the pressure between the inner peripheral surface of the wellhead and the conduit forming body. it can.

Also, when the wellhead packing device having the above structure is applied to the wellhead on the side of the leading equipment, the inner peripheral portion of the elastic packing member is pushed and expanded toward the rib by the leading equipment reaching the wellhead. It is slid on the outer peripheral surface of the device.
Then, when the leading equipment further advances, the inner peripheral part of the elastic packing member slides on the outer peripheral surface of the conduit forming body disposed at the rear part of the leading equipment, so that the inner peripheral surface of the wellhead and the conduit forming body Seal between Further, the ribs provided on one side surface of the elastic packing member can prevent the elastic packing member from being reversed.

According to a second aspect of the present invention, in the wellhead packing device according to the first aspect, the ribs are made of an elastic body.

According to the above construction, since the pipe forming body can be elastically supported by the rib and the elastic packing member with respect to the inner peripheral surface of the wellhead, the wellhead packing device is excellent in earthquake resistance.

According to a third aspect of the present invention, in the wellhead packing device according to the first aspect, a through hole through which the tightening wire is inserted is formed in the rib.

According to the above structure, when the wellhead packing device is applied to the wellhead on the arrival side of the leading equipment, the inner peripheral portion of the elastic packing member is formed from the outside by the tightening wire passing through the through hole of the rib. Since it can be tightened on the outer peripheral surface of the body, it is possible to enhance the pressure-proof sealing property of the elastic packing member against the pressure on the ground side.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of a wellhead packing device when the present invention is applied to the wellhead of a vertical shaft on the starting side of a propulsion method. 1 is a partially cutaway front view of the wellhead packing device, FIG. 2 is an enlarged view of the wellhead packing device of FIG. 1 taken along the line AA in FIG. 1, and FIG.
(B) is a longitudinal section end view which shows the effect | action of the wellhead packing apparatus of FIG. 1, respectively.

Referring to these figures, the shaft wall 2 of the vertical shaft 1
A wellhead 3 is formed on the inner wall surface and the outer wall surface of the shaft 1, and a plurality of bolts 5 projecting toward the inside of the shaft 1 are fixed to an opening end of the shaft 3 on the inner wall side. The fixing plate 4 is fixed. Further, a tubular body 6 is fixedly provided on the inner peripheral surface of the wellhead 3 on the inner wall side opening end side. Fixing plate 4
The cylindrical body 6 is integrated by welding or the like, and the inner peripheral surface of the cylindrical body 6 is buried in the shaft wall 2 of the shaft 1 so as to be flush with the inner peripheral surface of the wellhead 3. Propelling machine from wellhead 3 (not shown)
At the tip of a fume pipe (buried pipe) 7 as a pipe forming body extruded by the blade, a cutting port pipe 8 as a leading device is attached.

As shown in FIGS. 1 and 3, the wellhead packing device is provided with a plate-like elastic packing member 9 made of an elastic material such as rubber, and a plurality of through holes 9a through which the bolts 5 are inserted in the outer peripheral portion thereof. Are formed. Here, the elastic packing member 9 is also formed in an annular shape corresponding to the outer peripheral shape of the fume tube 7. Further, a plurality of through holes 11 a through which the bolts 5 pass are formed in the annular holding plate 11. By fixing the outer peripheral portion of the elastic packing member 9 to the wellhead 3 by passing the bolt 5 through the through holes 9a, 11a of the elastic packing member 9 and the pressing plate 11 and tightening the bolt 12 with the nut 12 screwed onto the bolt 5. You can

As can be seen from FIG. 3A, the elastic packing member 9 has an inner diameter smaller than that of the fume tube 7. On one side surface of the elastic packing member 9, a plurality of ribs 10 are arranged substantially radially along the inner peripheral portion of the elastic packing member 9. As shown in FIG. 2, each rib 10 has a plate block shape. Preferably, the rib 10 is made of an elastic material such as rubber. Further, preferably, as shown in FIG. 3, when the inner peripheral portion of the elastic packing member 9 is expanded by the blade mouth pipe 8 or the fume pipe 7, the rib 10 forms an inner peripheral surface of the wellhead 3 (a cylindrical shape in the illustrated embodiment). The height of the rib 10 is set so as to come into contact with or approach the inner peripheral surface of the body 6.

When the wellhead packing device having the above-described structure is provided in the wellhead 3 on the starting side of the vertical shaft 1, the elastic packing member 9 is attached to the wellhead 3 so that the ribs 10 are located outside the elastic packing member 9. Therefore, when the cutout tube 8 at the tip of the fume tube 7 is pushed out from the wellhead 3, the inner peripheral portion of the elastic packing member 9 is pushed and expanded at the tip of the cutout tube 8 to the side having the rib 10, that is, the outside of the shaft 1. . At this time, since the ribs 10 are arranged substantially radially along the inner periphery of the elastic packing member 9, the rib 10 does not hinder the operation of pushing and expanding the inner periphery of the elastic packing member 9. The inner peripheral portion of the elastic packing member 9 pushed outwardly of the shaft 1 is slidably contacted with the outer peripheral surface of the blade port tube 8, and then the outer peripheral surface of the fume tube 7 with the advance of the fume tube 7. (Fig. 3 (b)
Therefore, sealing is performed between the inner peripheral surface of the wellhead 3 and the outer peripheral surface of the blade port tube 8 and between the inner peripheral surface of the wellhead 3 and the outer peripheral surface of the fume tube 7 sequentially. At this time, if the elastic packing member 9 receives a pressure such as earth pressure outside the wellhead 3, the pressure causes the inner peripheral portion of the elastic packing member 9 to turn inside the shaft 1. The rib 1 provided on the side surface of the elastic packing member 9 opposite to the side surface in sliding contact with the rib 1
Since 0 corresponds to the vicinity of the mounting portion on the outer peripheral side of the elastic packing member 9, it is possible to prevent the elastic packing member 9 from being inverted due to the pressure outside the wellhead 3. Therefore, wellhead 3
Pressure acts on the inner peripheral portion of the elastic packing member 9 so as to press against the outer peripheral surface of the fume tube 7.
And the inner peripheral surface of the fume tube 7 can be pressure-resistant sealed. Therefore, the wellhead packing device having excellent water stopping properties is obtained.

Further, when the rib 10 is made of an elastic material such as rubber, the fume pipe 7 can be elastically supported on the inner peripheral surface of the wellhead 3 through the rib 10 and the elastic packing member 9, so that it is seismic resistant. It is an excellent wellhead packing device.

FIGS. 4 and 5 show a second embodiment in which the present invention is applied to a wellhead on the arrival side of a vertical shaft in a propulsion method. In these figures, the same components as those in the first embodiment are denoted by the same reference numerals. The elastic packing member 9 of the second embodiment is attached to the wellhead 3 of the vertical shaft 1 in the same manner as in the first embodiment, but the ribs 10 are radially arranged on one side surface of the elastic packing member 9. Is attached to the wellhead 3 so as to be located inside the vertical shaft 1, which is different from the above-described embodiment. Further, in the wellhead packing device of the second embodiment, each rib 10 is formed with a through hole 10a through which the tightening wire 13 is passed. As shown in FIG. 4, one end of this tightening wire 13 is locked to one of the opposed inner wall surfaces of the shaft 1, and the other end is provided with jack means 14 on the other inner wall surface of the shaft 1. Is locked through.

Therefore, in the case of the second embodiment, the inner peripheral portion of the elastic packing member 9 is pushed and spread to the side having the ribs 10, that is, the inner side of the shaft 1 by the blade pipe 8 reaching the shaft hole 3 of the shaft 1. Slidingly contacts the outer peripheral surface of the blade mouth tube 8. When the blade mouth pipe 8 further advances, the inner peripheral portion of the elastic packing member 9 is brought into sliding contact with the outer peripheral surface of the fume pipe 7 at the rear portion of the blade mouth pipe 8 so that the inner peripheral surface of the wellhead 3 and the fume pipe 7 are Seal between the outer peripheral surface. When the inner peripheral portion of the elastic packing member 9 is to be turned to the outside of the shaft 1, the rib 10 provided on one side surface of the elastic packing member 9 is attached to the vicinity of the mounting portion of the outer peripheral portion of the elastic packing member 9. To prevent the elastic packing member 9 from being inverted.

The rib 1 is operated by operating the jack means 14.
By tightening the tightening wire 13 passing through the through hole 10a, the inner peripheral portion of the elastic packing member 9 can be tightened on the outer peripheral surface of the fume tube 7, so that the elastic packing member against the pressure outside the wellhead 3 can be tightened. 9 can improve the pressure-resistant sealing property.

FIG. 6 shows a third embodiment in which the present invention is applied to the wellhead on the arrival side of the vertical shaft of the propulsion method. In the figure, the same components as those in the first and second embodiments are designated by the same reference numerals. In the third embodiment, when the inner peripheral portion of the elastic packing member 9 is expanded to the side where the rib 10 is present, that is, the inside of the vertical shaft 1, the tubular body 15 that surrounds the rib 10 is an annular pressing plate 11. It is provided integrally with. Reference numeral 16 denotes a reinforcing rib. Therefore, in the case of this third embodiment, when the space between the inner peripheral surface of the wellhead 3 and the outer peripheral surface of the fume pipe 7 is sealed by the elastic packing member 9,
Since the fume pipe 7 can be elastically supported by the tubular body 15 fixed to the wellhead 3 via the rib 10 and the elastic packing member 9, the wellhead packing device is excellent in earthquake resistance.

Although illustration is omitted, the mounting portion of the elastic packing member 9 may be provided inside the wellhead 3 so that the tubular body 15 shown in FIG. 6 is located on the inner peripheral surface of the wellhead 3. .

7 and 8 show modifications of the ribs 10 arranged on one side surface of the elastic packing member 9 of each of the above-described embodiments. The rib 10 shown in FIGS. 7 and 8 is made of an elastic material such as rubber. The rib 10 of FIG. 7 has curved side surfaces 10b and 10c so that the rib 10 can be easily compressed or buckled in the height direction. The rib 10 shown in FIG. 8 has a hollow portion 10d formed therein so that the rib 10 can be easily compressed or buckled in the height direction. When these ribs 10 are used, there is a large step between the outer shape of the fume tube and the segment (not shown) and the outer shape of the conduit forming body and the leading device such as the blade port tube and the excavator (not shown). However, after the rib 10 and the elastic packing member 9 seal and elastically support the inner peripheral surface of the wellhead 3 or the inner peripheral surface of the tubular body 15 and the outer peripheral surface of the leading device, the wellhead 3
It becomes easy to seal and elastically support between the inner peripheral surface of the cylindrical member 15 or the inner peripheral surface of the tubular body 15 and the outer peripheral surface of the conduit forming body.

Although the embodiments shown in the drawings have been described above, the present invention is not limited to the embodiments described above,
Various modifications can be made to the components within the scope of the invention described in the claims. For example, although not shown, when the wellhead packing device shown in FIG. 5 is applied to a wellhead for arrival, a wire for expansion is passed through the through hole 10a of the rib 10, and the elastic packing member 9 is connected to the wire.
If the inner peripheral portion is configured to be expanded by itself, the elastic packing member 9 is attached to the wellhead 3 so that the rib 10 is located outside the shaft 1 in the same manner as in the case where the inner peripheral portion of the well is provided in the starting wellhead. Can be. Then, if the expansion by the wire is released when the pipe forming body such as the fume pipe reaches the wellhead, the inner peripheral portion of the elastic packing member 9 comes into sliding contact with the outer peripheral surface of the pipe forming body. As in the case of the wellhead packing device provided in the above, a seal excellent in pressure resistance can be obtained.

Further, the present invention is not limited to the wellhead of a vertical shaft,
The present invention can be similarly applied to a wellhead for forming a branch tunnel formed on a tunnel wall, or a wellhead provided on the ground surface for construction of a shaft. Further, the elastic packing member may be formed in a non-annular shape such as a horseshoe shape or a gate shape corresponding to the shape of the pipe line forming body to be applied.

[0029]

As is apparent from the above description, according to the present invention, it is possible to provide a wellhead packing device having a simple structure and excellent water stopping properties.

[Brief description of drawings]

FIG. 1 is a partially cut-away schematic front view showing a first embodiment of a wellhead packing device in a case where the present invention is applied to a wellhead of a starting shaft in a propulsion method.

FIG. 2 is an enlarged cross-sectional view of the wellhead packing device of FIG. 1 taken along the line AA in FIG. 1;

FIGS. 3A and 3B are longitudinal sectional end views showing the operation of the wellhead packing device of FIG. 1;

FIG. 4 is a schematic front view showing a second embodiment of a wellhead packing device when the present invention is applied to a wellhead of a reaching side vertical shaft of a propulsion method.

5 (a) and 5 (b) are longitudinal sectional end views each showing the operation of the wellhead packing device of FIG. 4;

6 (a) and 6 (b) are longitudinal cross-sectional end views showing a third embodiment of a wellhead packing device when the present invention is applied to a wellhead of a reaching side vertical shaft of a propulsion method.

FIG. 7 is a sectional view similar to FIG. 2 showing a modified example of a rib provided on one side surface of an elastic packing member of the wellhead packing device.

FIG. 8 is a sectional view similar to FIG. 2, showing another modified example of the rib provided on one side surface of the elastic packing member of the wellhead packing device.

[Explanation of symbols]

 Reference Signs List 1 shaft 2 shaft wall 3 wellhead 7 fume tube (pipe forming body) 8 blade tube (leading device) 9 elastic packing member 10 rib 10a through hole 13 wire 14 jack means 15 cylindrical body

Claims (3)

[Claims] 1. A wellhead packing device for sealing between a wellhead and a conduit forming body disposed in an excavation well formed by communicating with the wellhead, the outer peripheral portion of which is attached to the wellhead. And a plate-like elastic packing member whose inner peripheral portion is expanded by a leading device at the tip of the conduit forming body and slidably contacts the outer peripheral surface of the conduit forming body. A wellhead packing device characterized in that a plurality of ribs are arranged substantially radially on the side surface along an inner peripheral portion of the elastic packing member. 2. The wellhead packing device according to claim 1, wherein the rib is made of an elastic material. 3. The wellhead packing device according to claim 1, wherein the rib has a through hole through which a tightening wire is passed.