JPH10266188A - Pit open-close device for investigation functioning as grouting in combination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct insertion and extraction to an interiorly finished pipe for pinching a seal ring and the external facing pipe of a clamping bolt easily even when a space in the upper section of the external facing pipe buried into a pit for investigation is reduced. SOLUTION: A long-sized external facing pipe 17 is buried and fixed into a ground in a pit for investigation functioning as grouting in combination. A long-sized clamping bolt 23, to which a plurality of shaft lever members are connected in a bendable manner, is arranged concentrically into the external facing pipe 17 in a manner that the clamping bolt 23 can be inserted and extracted at that time, seal-ring support plates 24, on which elastic seal rings 27 capable of being abutted against the inner circumferential surface of the external facing pipe 17 are placed, are installed to the clamping bolt 23, seal-ring pushing plates 25 abutted against the top faces of the elastic seal rings 27 are mounted on an interiorly finished pipe 18 consisting of a plurality of interiorly finished pipe members successively inserted to the clamping bolt 23 in a manner that the interiorly finished pipe members can be inserted and extracted, and the upper end section of the interiorly finished pipe 18 is clamped by the clamping bolt 23. Accordingly, the elastic seal rings 27 are pushed by the seal-ring support plates 24 and the seal-ring pushing plates 25, and brought into press-contact with the inner circumferential surface of the external facing pipe 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting and investigating hole opening / closing device installed in a drainage channel or other underground structure or a river structure such as a gutter, a gutter, a bridge, or the like.

[0002]

2. Description of the Related Art Conventionally, a grouting and inspection hole opening / closing device provided at the bottom of an underground structure has been disclosed in Japanese Utility Model Laid-Open No. 4-730.
There is one disclosed in Japanese Patent Publication No. 79. This is provided with a lower vertical pipe which is a grout injection and investigation hole at the bottom of the underground structure, and accommodates a closing unit in the lower vertical pipe,
The sealing plate and the seal ring at the bottom of the closing unit are tightened with tightening bolts, and the seal ring presses against the inner peripheral surface of the lower vertical pipe to prevent muddy water from entering the lower vertical pipe, and to grout The structure eliminates the complicated work of removing mud in the survey hole during the survey.

On the other hand, river structures include gutters, gutter pipes, bridges and the like. Abutments, which are substructures of the bridge, also have cavities due to consolidation settlements and the like as well as gutter pipes. Since the embankment might collapse from the abutment, grouting agent had to be injected into the cavity.

[0004] Therefore, investigation of cavities generated under the abutment,
An inspection hole that allows grout injection is required, but in the case of an abutment, the implementation is delayed because a longer inspection hole is required due to the structure of the abutment as compared to an inspection hole such as a drainage channel. I was Recent technological advances have made it possible to manufacture long pipes with increased strength for pipes to be inserted into survey holes, so that not only gutters and gutter pipes but also cavities under abutments of river bridges and grout injection In addition, a long external pipe and an internal pipe are used as a switchgear for excavating a long investigation hole and removing invasion of muddy water and the like, so that the inspection can be smoothly performed. In addition, the angle and length of the survey hole are adjusted in consideration of the size of the abutment.

[0005] More specifically, as shown in FIG. 18, in the abutment 1 having an upper portion formed of a parapet wall 2 and having an engaging step 3 for supporting a bridge girder 9 on the side opposite to the road 4, Is formed so as to be supported by the upper end of a pile 7 driven into the ground 6. A predetermined amount of discarded concrete 8 is cast on the lower surface of the footing foundation 5.

Incidentally, the lower part of the footing foundation 5 is consolidated and settles to form a cavity A. If the cavity A is left unattended, the levee may eventually collapse from the abutment 1 portion.

For this reason, the presence or absence of the cavity A generated under the abutment 1 is investigated, and the investigation hole 10 in which grout can be injected together.
Are required. After the grout is injected or the survey is completed, a tube 11 and a long tightening bolt 1 inserted into the tube 11 are inserted into the survey hole 10 as shown in FIG.
2 and an inspection hole closing device 14 having an elastic seal ring 13 sandwiched between a seal ring pressing plate provided on the tube 11 and a seal ring support plate provided on the tightening bolt 12 are inserted.
By fastening the fastening bolt 12, the elastic seal ring 13 sandwiched between the seal ring pressing plate and the seal ring support plate is compressed so that the thick portion becomes flat, and the diameter thereof is increased.
Thereby, the inspection hole 10 is sealed, and the intrusion of muddy water or the like is prevented. 15 is a cap device.

The survey hole 10 used in the abutment 1 has an upper end reaching the embankment surface 16 and only a vertical survey hole that facilitates survey work can be installed. It is considered that the number of the survey holes 10 and 10 in the inclination direction toward the bottom 9 is increased. However, under the bridge girder 9, if the inspection hole closing device 14 that inserts into the inspection hole 10 and closes the inside thereof is long, it is obstructed by the lower surface of the bridge girder 9 when pulling out from the inspection hole 10 and cannot be pulled out. That happens.

[0009]

As described above, the investigation hole used for the abutment is provided on the abutment surface where the investigation work is easy or
It is sufficient if it can be installed from the embankment surface in contact with the abutment, but it is often required to install it under the bridge in consideration of the running of the vehicle and other factors. In this case, a long interior pipe or a fastening bolt from the inspection hole 10 There was a problem that extraction was not easily performed because it was hindered by the upper bridge girder.

[0010]

In order to solve the above-mentioned problems, a grouting and investigating hole opening and closing device according to the present invention is provided.
In a grout injection and inspection hole in which a long outer tube is embedded and fixed in the ground, a long tightening bolt formed by bending and connecting a plurality of shaft rod members is concentrically inserted into the outer tube. A seal ring support plate, which is arranged so as to be able to be removed and has an elastic seal ring which can be brought into contact with the inner peripheral surface of the outer pipe, is provided on the tightening bolt, and the tightening bolt is sequentially fitted so that it can be inserted and removed. An inner pipe made of a plurality of inner pipe members is provided with a seal ring pressing plate abutting on the upper surface of the elastic seal ring, and an upper end portion of the inner pipe is tightened by the tightening bolt, so that the seal ring support plate and the It is characterized in that the elastic seal ring is pressed by a seal ring pressing plate and pressed against the inner peripheral surface of the outer tube. The present invention also provides
At the end of each inner pipe member opposite to the side where the seal ring pressing plate is provided, a flange smaller in diameter than the inner circumference of the outer pipe is provided, and the elastic seal ring is provided between the seal ring pressing plates of each inner pipe member. And the elastic seal ring is pressed against the inner peripheral surface of the outer pipe by tightening the tightening bolts, thereby forming a plurality of elastic water blocking portions in the outer pipe. Further, the present invention is characterized in that the inner pipe is provided with a disk-shaped spacer for holding the inner pipe at the center of the outer pipe. Further, in the present invention, the connection between the shaft members of the tightening bolt is connected by a pin connection or a link connection so as to be bendable in one direction or a plurality of directions. Further, in the present invention, the outer tube is constituted by a single long member, or a plurality of short tube members each having a joint flange at an end portion are joined by packing using a fixing means and formed into a mess via a packing. It is characterized by the following.

According to the present invention, the tightening bolt can be bent at a plurality of locations in any direction and pulled out while sequentially pulling out the tightening bolt from the outer pipe and sequentially pulling out the inner pipe member from this bolt. Even if the upper space is small, the long fastening bolt and the inner tube can be smoothly pulled out from the upper end of the outer tube.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an investigation hole opening / closing device 26 used for an abutment, and FIG.
3 is a further enlarged view of FIG. 2, and FIGS. 4 to 13 are investigation hole opening / closing devices 2 according to the first embodiment of the present invention.
FIG.

In FIG. 1, a bridge girder 9 spans an abutment 1 provided on the left and right sides of a river 19. Abutment 1
For example, as shown in the figure, first, second and third inspection holes 2 are provided.
0, 21 and 22 are provided, and the presence or absence of the cavity A on the lower side of the abutment 1 is investigated through each investigation hole. When the cavity A is present, the inspection hole 20, 21, 22 is used for repair. The cavity A is filled with mortar.

In the above, the first, second, and third inspection holes 20, 21, and 22 are provided with opening / closing devices 26 to prevent the inflow of river water and mud embankment after use. The inspection holes 20, 21, 22 are closed using. As shown in FIG. 3, the opening / closing device 26 is provided so as to be embedded in each of the inspection holes 20, 21, and 22. , A fastening bolt 23 provided to be insertable into and removable from the interior pipe 18, and a fastening bolt 2.
3 is fastened to the inner pipe 18, whereby the seal ring support plate 24
And the seal ring pressing plate 25 provided on the inner tube 18 is pressed, thereby pressing the elastic seal ring 27 and pressing the inner surface of the outer tube 17 by pressing. It constitutes the water section.

In the inspection hole opening / closing device 26 having the above-described structure, in order to open and close the inspection holes 20, 21 and 22, the inner tube 18 and the tightening bolts 23 are inserted and removed from the upper end of the outer tube 17. In this case, in the first inspection hole 20 shown in FIGS. 1 and 2, the hole rises vertically,
Since the upper end of the hole extends to the embankment surface 16, the inner pipe 18 and the tightening bolt 23 can be freely inserted from the upper end of the outer pipe 17 without being obstructed by anything even if it is long.
Can be extracted.

On the other hand, as can be easily understood from FIG. 1, since the bridge girder 9 exists above the extension of the second and third investigation holes 21 and 22, the bridge girder 9 becomes an obstacle. ,
If the inner pipe is longer than the gap between the upper ends of the inspection holes 21 and 22 and the lower surface of the bridge girder 9 and the fastening bolts, it cannot be pulled out or inserted from the upper ends of the inspection holes 21 and 22.

Therefore, in the present invention, as will be described below with reference to FIG. 4 and subsequent figures, an inner pipe 18 composed of a plurality of divided inner pipe members is provided so as to be freely bent over the entire length of the outer pipe 17. The fitting bolt 23 is fitted and inserted.

The fastening bolt 23 and the inner pipe 18 are provided at predetermined lengths corresponding to the length of the outer pipe 17.
As shown in FIG. 9A, the fastening bolt 23
It comprises first, second, and third shaft members 28, 29, and 30 that are freely bent and connected by two connecting shaft pins 35, and a lower end of the tightening bolt 23 has an outer tube. A disk-shaped seal ring support plate 24 having a diameter slightly smaller than the inner diameter of the screw 17 is provided, and a screw portion 31 is provided at an upper end portion of the bolt. It is.

As shown in FIGS. 9 to 12, the connecting end of each of the shaft rod members 28, 29, and 30 has a columnar portion that is in contact with each other and is cut in a stepwise manner over a predetermined range. Part 33
Are in contact with each other, the shaft pin 35 is inserted into the insertion hole 34 formed in the contact portion, and the end of the pin is swelled.
6, the shaft pin 35 is provided so as not to come out of the insertion hole 34, and the fastening bolt 23 can be bent at two places by using the two shaft pins 35 as joints.

As shown in FIG. 9B, the inner pipe 18 has first, second, third, and fourth inner pipe members 37,
38, 39, and 40, each of which is fitted into a fastening bolt 23 that extends straight. Also, the first
A seal ring pressing plate 25 is provided at a lower end of the inner pipe member 37, and an elastic seal ring 27 is sandwiched between the seal ring pressing plate 25 and a seal ring support plate 24 provided at a lower end of the tightening bolt 23.

The seal ring pressing plates 25, 25 provided at the upper end of the second inner pipe member 38 and the lower end of the third inner pipe member 39 are provided.
The elastic seal ring 27 is also sandwiched between them. Disc-shaped spacers 41 are provided on the second and third interior pipe members 38 and 39.
Is provided. The outer peripheral edge of the spacer 41 is
The inner tube 18 is held at the center of the outer tube 17 by lightly contacting the inner surface of the inner tube. At the upper end of the fourth inner pipe member 40, a pressure receiving plate 42 is provided, which also serves as a spacer for holding the inner pipe 18 at the center of the outer pipe 17 and reliably receives the fastening force of the nut 32. The first and second interior tube members 37,
38 and the third and fourth interior tube members 39, 40
The contact portions are also provided with pressure receiving flanges 43 for stably contacting each other and securely transmitting the fastening force from the upper portion to the lower portion.

As shown in FIG. 4 and FIG.
A sealing cap device 44 is provided at the top of the device. In this cap device 44, a cylindrical wall 46 is erected on an upper surface near an outer periphery of an upper flange 45 disposed at an upper end of the outer tube 17. An annular packing 47 is provided on the inner surface of the upper flange 45 inside the cylindrical wall 46, and a seal plate 49 for opening and closing the upper opening 48 of the outer pipe 17 is detachably mounted on the upper surface of the packing 47. A bolt 50 rises from the center of the seal plate 49.

On the upper surface of the sealing plate 49, a rectangular pressing plate 51 as viewed from above is mounted, and the bolt 50 rises through the center hole 52 of the pressing plate 51. Can be pressed against the sealing plate 49 at the center of the pressing plate 51. A key slope 5 that is inclined in the width direction so that the upper surface of both ends of the holding plate 51 has a reverse taper on the left and right sides, respectively.
4, 54a, and the key slopes 54, 54a
The key member 57 is provided so as to be inserted through a key insertion hole 56 formed in the cylindrical wall 55. In addition,
An elastic cap 58 is detachably fitted to the upper end opening of the cylindrical wall 55.

In the sealing cap device 44, the key member 57 is inserted through the key insertion hole 56, and the tip of the key member 57 is engaged with the key slopes 54, 54a, and the knob 59 on the upper surface of the holding plate 51 is gripped. By slightly turning the holding plate 51 clockwise around the bolt 50, the sealing plate 49 is pressed against the packing 47 via the holding plate 51 by the engagement between the key member 57 and the key slopes 54 and 54a. The upper opening 48 of the tube 17 can be closed. Further, by turning the pressing plate 51 in the opposite direction to disengage the key members 57 from the key slopes 54 and 54 a and pulling the key members 57 outward from the key insertion holes 56, the sealing plate 49 The holding plate 51 can be pulled up from the cylindrical wall 46 and removed, and the upper opening 48 of the outer tube 17 can be opened.

Next, the operation will be described. As shown in FIG. 4, inside the outer pipe 17, the inner pipe 18 and the tightening bolt 23 are provided.
The lower elastic seal ring 27 is pressed between the seal ring support plate 24 and the seal ring pressing plate 25 by pressing the upper end of the inner pipe 18 by tightening the nut 32, and the upper seal ring 27 is the upper and lower 2
By being pressed between the two seal ring pressing plates 25, 25, each seal ring 27 becomes flat and expands in diameter, and presses against the inner peripheral surface of the outer pipe 17, thereby sealing the inside of the outer pipe 17. be able to.

Since the seal ring pressing plate 25 is curved so that the pressure contact surface with the seal ring 27 protrudes, the upper and lower side surfaces of the seal ring 27 are easily pressed, and the diameter of the seal ring 27 is increased more smoothly. Thus, the inner surface of the outer pipe 17 can be reliably closed.

When pulling out the inner tube 18 and the fastening bolt 23 from the outer tube 17, the sealing cap device 44 is removed from the upper end of the outer tube 17. Next, the nut 32 at the upper end of the tightening bolt 23 is loosened. As a result, the pressure of the elastic seal ring 27 is released, so that the seal ring 27 is restored to the original cross-sectional shape, and the diameter thereof is reduced along with it and separated from the inner peripheral surface of the outer pipe 17. Interior tube 18
Becomes free with respect to the outer tube 17. Then, as shown in FIG. 7, the inner pipe 18 and the fastening bolt 23 can be pulled out from the upper end of the outer pipe 17.

FIG. 7 shows a state in which the fastening bolt 23 has been pulled out from the upper end of the outer tube 17, and then the nut 32 is removed from the upper end of the fastening bolt 23. Next, the fourth and third inner pipe members 4 located above the upper part of the outer pipe 17 are disposed.
0, 39 is pulled out from the upper end of the tightening bolt 23. Thereby, the tightening bolt 23 becomes freely bendable, so that the third shaft member 30 above the shaft pin 35 located above the upper end of the outer tube 17 can be bent as shown in FIG. it can. Further, the second and first shaft members 29 and 28 are pulled out from the upper end of the outer tube 17, and
After the second and first interior tube members 38 and 37 are pulled out from the bolts, the second shaft member 29 may be removed from the exterior tube 17 while bending the second shaft member 29 with the lower shaft pin 35 as a fulcrum as described above. it can. This opens the inside of the outer tube 17,
From here, you can plug in a survey tool or inject grout.

As described above, the tightening bolt 23 can be pulled out from the outer tube 17 while bending the plurality of shaft pins 35 and 35 as joints. Can be pulled out smoothly. Therefore,
Even if the bridge girder 9 is located above the outer pipe 17 as shown in FIG. 1, the tightening bolt 23 can be smoothly pulled out from the upper end of the outer pipe 17, and the tightening bolt 23 and the interior can be removed by the opposite operation. The tube 18 can be smoothly inserted into the outer tube 17.

Next, FIG. 14 shows an inspection hole opening and closing device according to a second embodiment. In the second embodiment, first, the structure of the outer tube 17a is slightly different from that of the first embodiment. That is, in the first embodiment, the outer pipe 17 is a single long piece, whereas in the second embodiment, the outer pipe 17a is formed of a plurality of short pipes having the joining flanges 60 at the ends. The members 17b are joined to each other via a packing 74 in a humid manner. The length of the short pipe member 17b is preferably, for example, about 3 m, which is suitable for truck transportation. The plurality of short pipe members 17b are connected to each other, and the bolt insertion of the joint flange 60 and the packing 74 is performed. Hole (FIG. 17 shows a bolt insertion hole 75 of the packing 74).
The bolts 61 are inserted into the nuts, and the nuts 62 are fastened, whereby the outer pipe 17a having a predetermined length can be assembled and constructed on site. In the second embodiment, the second fastening bolt 2
The structure of 3a is slightly different from the first embodiment. That is, in the first embodiment, the tightening bolt 23 is formed by connecting the first, second, and third shaft members 28, 29, and 30 with the shaft pins 35. Therefore, each shaft member is connected to each shaft member. Pin 3
5 can be bent only in one direction perpendicular to the axis. On the other hand, in the second embodiment, as shown in an enlarged view in FIG. 15, a link 65 is fixed to the end of each of the shaft members 63, 64, and the link 65 of the upper and lower shaft members 63, 64 facing each other. A long fastening bolt 23a is formed by engaging with each other. Therefore, in the second embodiment, there is an operational convenience that the respective shaft members 63 and 64 can be freely bent in any direction by 360 ° via the engaging portion of the link 65.

FIG. 16 shows a tightening bolt 23b according to still another embodiment. In this embodiment, a short joint shaft 6 is provided between the upper and lower shaft members 66 and 67.
8 is interposed, an axial direction is changed by 90 ° at both ends of the joint shaft 68 to form a shaft hole 69, and the shaft pins 70 and 71 are inserted into the shaft hole 69 at a right angle to each other. Further, the shaft pins 70, 71 are inserted into the shaft holes 72, 73 of the upper and lower shaft rod members 66, 67 to form a long fastening bolt 23b. Therefore, with the fastening bolt 23b, the upper and lower shaft rod members 66, 67 are bent at different angles in the direction perpendicular to each other via the shaft pins 70, 71 arranged at right angles at both ends of the joint shaft rod 68, respectively. This increases the degree of freedom, thereby improving the workability when pulling out the long fastening bolt 23b from the interior tube 18.

[0032]

As described above, according to the present invention,
Since the fastening bolt to be inserted into the outer pipe is configured by connecting the shaft rod member to bend freely, and the inner pipe to be fitted to the tightening member is configured by a plurality of inner pipe members divided from each other, While sequentially pulling out the tightening bolt from the outer tube, the inner pipe member can be sequentially pulled out from the bolt, and then the tightening bolt can be pulled out while bending at the position of the shaft pin. Thereby, even if the fastening bolt is long, there is no need for a space corresponding to the length of the fastening bolt above the outer pipe, and therefore,
Even if a structure such as a bridge girder exists above the outer tube, there is an effect that the fastening bolt and the inner tube can be smoothly inserted into and extracted from the outer tube, and the configuration is simple. further,
When the outer pipe is formed by joining a plurality of short pipe members, it is possible to assemble on site, and thus there is an effect that transportation becomes convenient.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a research hole opening and closing device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the inspection hole opening / closing device on the left side of FIG.

FIG. 3 is an enlarged sectional view of one investigation hole opening / closing device of FIG. 2;

FIG. 4 is an enlarged cross-sectional view showing the inspection hole opening and closing device.

5 is an enlarged cross-sectional view of the top of the inspection hole opening / closing device of FIG. 4;

FIG. 6 is a cross-sectional view of the head of FIG. 5;

FIG. 7 is a sectional view showing a state in which a fastening bolt and an inner pipe are pulled up from an outer pipe of the inspection hole opening / closing device.

FIG. 8 is a cross-sectional view showing a state in which a fastening bolt is bent and pulled up from an outer tube.

FIGS. 9A and 9B are a side view and a side sectional view of a fastening bolt and an inner pipe.

FIG. 10 is a cross-sectional view showing a mutual relationship between a connection portion of a fastening bolt, an inner tube, and an outer tube.

FIG. 11 is a cross-sectional view of the fastening bolt connection part of FIG. 10;

12A is a longitudinal sectional view of a connecting portion of a fastening bolt, FIG. 12B is a side view of FIG. 12A, and FIG. 12C is a side view of the bolt connecting portion bent at 90 ° in FIG.

13A is a cross-sectional view in a state where the seal ring is not compressed, and FIG. 13B is a cross-sectional view in a state where the seal ring is compressed.

FIG. 14 is a cross-sectional view illustrating a research hole opening and closing device according to a second embodiment of the present invention.

FIGS. 15A and 15B are a partially enlarged view and a partial perspective view of a tightening bolt of a portion C in FIG. 14;

16A and 16B are a partial enlarged view and a partial perspective view of a fastening bolt according to another embodiment.

17A is a front view of the packing, and FIG. 17B is a cross-sectional view taken along the line II-II of FIG.

FIG. 18 is a sectional view showing an example of a conventional inspection hole opening and closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Abutment 2 Parapet wall 3 Engagement step part 4 Road 5 Footing foundation 6 Underground 7 Piles 8 Discarded concrete 9 Bridge girder 10 Inspection hole 11 Tube 12 Tightening bolt 13 Elastic seal ring 14 Inspection hole closing device 15 Cap device 16 Embankment surface 17 Exterior tube 18 Interior tube 19 River 20 First inspection hole 21 Second inspection hole 22 Third inspection hole 23 Fastening bolt 24 Support plate 25 Seal ring pressing plate 26 Opening / closing device 27 Elastic seal ring 28 First shaft member 29 Second shaft member 30 Third shaft member 31 Screw portion 32 Nut 33 Half cut portion 34 Insertion hole 35 Shaft pin 36 Swelling portion 37 First interior tube member 38 Second interior tube member 39 Third interior tube member 40 Fourth Inner tube member 41 Spacer 42 Pressure receiving plate 43 Pressure receiving flange 44 Sealing cap device 45 Upper part Flange 46 cylindrical wall 47 packing 48 upper opening 49 seal plate 50 bolt 51 holding plate 52 center hole 53 fastening nut 54, 54a key slope 55 cylindrical wall 56 key insertion hole 57 key member 58 elastic cap 59 knob 60 joint flange 61 bolt 62 Nut 63 Shaft bar 64 Shaft bar 65 Link 66 Shaft bar 67 Shaft bar 68 Joint shaft 69 Shaft hole 70 Shaft pin 71 Shaft pin 72 Shaft hole 73 Shaft hole 74 Packing 75 Bolt insertion hole

Claims (5)

[Claims] 1. A grouting and investigating hole in which a long outer tube is embedded and fixed in the ground, and a long tightening bolt formed by connecting a plurality of shaft members in a freely foldable manner is concentric with the outer tube. A sealing ring support plate, which is disposed so as to be capable of being inserted and withdrawn and which has an elastic seal ring capable of abutting against the inner peripheral surface of the outer pipe, is provided on the fastening bolt, and is inserted into and removed from the fastening bolt. By providing a seal ring pressing plate in contact with the upper surface of the elastic seal ring on the inner pipe composed of a plurality of inner pipe members fitted in order as possible, by tightening the upper end of the inner pipe with the tightening bolt, Grout injection and investigation, wherein the elastic seal ring is pressed by a seal ring support plate and the seal ring pressing plate and pressed against the inner peripheral surface of the outer pipe. Hole opening and closing device. 2. A flange having a smaller diameter than the inner circumference of the outer pipe is provided at an end of each of the inner pipe members opposite to a side on which the seal ring pressing plate is provided. The elastic seal ring is sandwiched, and the elastic seal ring is pressed against the inner peripheral surface of the outer pipe by tightening the tightening bolt, thereby forming a plurality of elastic water blocking portions in the outer pipe. The grouting and investigating hole opening and closing device according to claim 1. 3. The grouting and investigating hole opening and closing device according to claim 1, wherein the inner tube is provided with a disk-shaped spacer for holding the inner tube at the center of the outer tube. 4. The connection between the shaft members of the tightening bolt is connected so as to be bent in one direction or a plurality of directions by pin connection or link connection. The grouting and investigating hole opening / closing device according to any one of the above. 5. The outer pipe is constituted by a single long piece, or
4. The method according to claim 1, wherein a plurality of short pipe members each having a connecting flange at an end portion are formed by connecting the short pipe members to each other through packing using a fixing means. Grouting and inspection hole opening and closing device.