JPH074174A - Pit mouth sealing device - Google Patents

Abstract

PURPOSE:To enable a mounting work to be easily carried out by sealing space between the external surface of a cylindrical body penetrating toward soil through the internal space of a cylindrical member sealed and fixed to a mouth pit, and the internal surface of the cylindrical member with a sealant expanded by fluid. CONSTITUTION:A recess 1a is formed on a concrete wall body 1 erected at a mouth pit, and a cylindrical member 2 with anchors 2a implanted around is laid. Space between the body 1 and the member 2 is filled with concrete mortar, thereby sealing the space and fixing the member 2. Then, a sealing member 4 is provided inside an annular plate 2b projected from the internal surface of the member 2, and a cylindrical body 8 such as the forward end of an excavator is aligned therewith and inserted. Thereafter, the internal space 4C of the sealing member 4 is forcibly filled with the air and expanded, thereby sealing a space between the member 2 and the body 8. Then, the recess 1a is filled with pressurized water from a pressure hose 3 to undertake a pressure test, and safety is confirmed before starting an excavator. According to this construction, a sealing device can be easily mounted on the mouth pit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wellhead sealing device, and more particularly to a slidably sealing a cylindrical body such as a wellbore excavator which penetrates into the ground of a wellhead from the wellhead into the ground. To a sealing device for

[0002]

2. Description of the Related Art Recently, shield type excavators are often used for excavating tunnels and the like. When starting construction with such an excavator, first create a wall body reinforced with concrete etc. on the front ground surface at the position where the excavator will start and inject chemical liquid etc. into the ground in the approach direction to solidify deeply. A layer is formed, and then a wellhead is formed in this wall for the excavator to enter, and this is shown in FIG.
Attach the entrance packing device as shown in 6,
After that, the wall remaining in the well is destroyed and removed, the tip of the excavator is fitted into the well, and then the excavator is started toward the solidified layer, and then the excavator and the entrance packing device are connected. A pressure resistance test was carried out to investigate the sealing performance between them.

In such a conventional entrance packing device, as shown in FIGS. 5 and 6, an annular body a with a flange is fixed to a wellhead by an anchor bolt or the like, and concrete mortar or the like is filled in the gap and sealed. It is stopped and is constituted by sequentially mounting a rubber annular sheet packing c and an annularly arranged metal fitting d with a flap on the flange b. And when the tip of the excavator enters,
The flap e pushes the sheet packing c to assist the excavator from entering, and when injecting pressurized water or the like into the front part of the excavator to test the sealing performance, the sheet packing c is supported by the flap e to move backward. It is designed so that it will not be served.

[0004]

However, such a conventional device has a problem in that it has a large number of parts, a large number of man-hours for attachment to the wellhead, and a large number of days required for attachment. Moreover, it is not only time-consuming to remove the wall remaining on the front side before fitting the excavator, but it is also necessary to increase the depth of the solidified layer of the ground to about 10 m to ensure the safety of the work. It was necessary and was a cause of increasing the construction cost.

Therefore, the present invention has a small number of constituent parts and can be easily mounted to a wellhead, and can further simplify the preparation work for starting the installation of the excavator, simplifying the solidification of the ground and the construction of the wall body. The purpose of the present invention is to provide a novel wellhead sealing device that enables the above.

[0006]

A wellhead sealing device capable of achieving the above object is such that a hollow rubber seal material is provided along the inner peripheral surface of a cylindrical member which is fixedly sealed at the wellhead. A cylinder in which a head portion and a tail portion of the sealing material are joined to each other by a rubber filler and the sealing material expanded by a fluid press-fitted into a hollow portion penetrates the inner space of the cylindrical member toward the ground. The outer peripheral surface of the body and the inner surface of the cylindrical member are slidably sealed.

Here, the cylindrical body slidably sealed with respect to the cylindrical member penetrates into the ground from the wellhead and is fitted on the outer surface of the wellhole excavator or the wellhole excavator. It may be any of the annular members described above, or may be a tubular body similar to this.

The wellhead sealing device of the present invention is further illustrated in FIGS.
As will be described in detail with reference to 4, reference numeral 1 is a concrete wall body formed in the wellhead. A cylindrical member 2 in which a recess 1a, which will be a pit for introducing an excavator later, is formed in the wall body 1 by a hanging work, and an anchor 2a is planted around the recess.
, And concrete mortar is injected between the wall 1 and the cylindrical member 2 to seal and fix. At that time, the pressure hose 3 or the like used for performing the pressure test of the sealing device can be buried. In addition, A is a pressure resistance test apparatus.

An annular plate 2b is provided so as to project from the inner surface of the cylindrical member 2, and a long rubber hollow seal member 4 is formed inside the annular plate 2b so as to go around the inner surface of the cylindrical member 2. Further, the head portion 4a and the tail portion 4b are circumferentially arranged so as to line up, and the head portion 4a
A rubber filling material 5 such as urethane rubber or silicone rubber is filled between the adjacent portions of the tail portion 4b and the tail portion 4b so that no gap is formed. In addition, 6 is a bolt for fixing the sealing material 4 to the inner surface of the cylindrical member 2.

Here, the internal space 4c of the sealing material 4 is the head 4
It communicates with the fluid hose 4d attached to a, and through the fluid hose 4d, for example, pressurized air is supplied to the internal space 4d.
c to introduce the sealing material 4 into the cylinder c to expand it, and to discharge it to contract the whole, so that the outer surface of the excavator fitted inside the cylindrical member 2 or the cylindrical sleeve 8 provided on the outer surface of the excavator.
The outer surface and the inner surface of the cylindrical member 2 can be freely sealed or opened. In the figure, B is a seal pressurizing device.

[0011]

According to the wellhead sealing device of the present invention, first, a concave portion 1a is formed in a part of a wall body 1 provided at a portion to be a wellhead, a cylindrical member 2 is attached thereto, and then concrete mortar or the like is poured into the wall. The periphery of the body 1 and the cylindrical member 2 are joined and sealed. After that, a rubber-made hollow seal material 4 is attached along the inner peripheral surface of the cylindrical member 2, a cylinder body 8 such as the tip of an excavator is aligned with this, and then inserted, and then the seal material 4 is filled with air,
An appropriate fluid such as water or oil is press-fitted and expanded to seal between the cylindrical member 2 and the cylindrical body 8. After that, pressurized water or the like is injected from the pressure hose 3 to perform a pressure resistance test, and after confirming the safety, the excavator is started to destroy the rest of the wall body 1 and simultaneously start excavation of the ground.

At this time, when moving the excavator,
Movement can be facilitated by adjusting the fluid pressure that is press-fitted into the sealing material 4, and when the ground water pressure is high, the water-stopping effect can be enhanced by increasing the fluid pressure that is pressed into the sealing material 4. . When a pipe or the like is to be installed instead of the excavator, a permanent water blocking structure can be easily formed by press-fitting a curable resin or the like instead of a pressurized fluid such as air.

[0013]

EFFECT OF THE INVENTION The wellhead sealing device of the present invention has a simple structure of the constituent members, has a small number of parts, and is extremely easily attached to the wellhead. In addition, the excavator can be installed easily, and the pressure resistance test can be performed immediately after the installation, and the excavation work can be started immediately after the pressure resistance test is completed. Therefore, it is possible not only to omit the removal work of the wall body that was conventionally performed before installing the excavator, but also to omit the grout treatment of the ground that was performed to ensure the safety of the removal work of the wall body. As a result, the number of work steps and the work period can be shortened, which is extremely economical.

Moreover, such a wellhead sealing device of the present invention can be used regardless of the location or size, and is applicable not only to tunnel excavation but also to wellbore excavation. There are also features that can be used for.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration of a wellhead sealing device of the present invention.

FIG. 2 is a perspective view showing an assembled state of a cylindrical member and a sealing material in the wellhead sealing device of the present invention.

FIG. 3 is a partial cross-sectional view showing a sealed state in the wellhead sealing device of the present invention.

FIG. 4 is a sectional view showing a mounting state of the wellhead sealing device of the present invention.

FIG. 5 is a partial sectional view of a wellhead sealing device according to the prior art.

FIG. 6 is a partial perspective view of a wellhead sealing device according to the prior art.

[Explanation of symbols]

 1 Wall 1a Recess 2 Cylindrical Member 2a Anchor 2b Annular Plate 3 Pressure Hose 4 Sealant 4a Head 4b Tail 4c Internal Space 4d Fluid Hose 5 Filler 6 Bolt 8 Cylindrical Sleeve A Pressure Tester B Seal Pressurizer a Annular body b Flange c Sheet packing d Metal fitting with flap e Flap

Claims (2)

[Claims] 1. A hollow rubber seal material is provided around an inner peripheral surface of a cylindrical member sealed and fixed to a wellhead, and a head portion and a tail portion of the seal material are adjacent to each other by a rubber filler. The sealing member that is joined and expanded by the fluid pressed into the hollow portion is slidable between the outer peripheral surface of the cylindrical body that penetrates the inner space of the cylindrical member toward the ground and the inner surface of the cylindrical member. A wellhead sealing device characterized by being sealed. 2. The wellhead sealing device according to claim 1, wherein the cylindrical body is either a wellbore excavator or an annular member fitted to the outer surface of the wellbore excavator.