JP2587680Y2 - Mouth packer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mouth packer for preventing grout material from being blown out by pressurized water when an earth anchor is installed.

[0002]

2. Description of the Related Art Conventionally, an earth anchor has been installed to connect a structure to the ground. Generally, a ground is drilled with a casing pipe connected to a drilling machine, and an anchor cable is inserted into the drilled anchor hole. Then, a grout material such as mortar or cement milk is injected under pressure into the anchor hole while pulling out the casing tube to form an earth anchor in the ground.

[0003] Conventionally, when drilling with a drilling machine,
Casing pipes with a length of about 1.5 meters are connected in sequence according to the drilling depth. In the case of ground with pressurized water, a waterproofing bit is attached to the tip of the casing pipe to stop water. Drilling is being performed as planned.

In order to form an earth anchor,
After attaching a pressure cap to the rearmost opening of the casing pipe after drilling the desired depth, the connected casing pipe is pulled up by one pipe, and the grout material is pressure-injected into the drawn hole, and After injecting the grout material into the drawing hole, remove the casing tube connected to the rearmost end, attach a new pressurizing cap to the rear end opening of the next casing tube, and pull up the casing tube one by one again. The ground anchor is formed in the ground by repeatedly injecting the grout material under pressure into the extraction hole.

[0005] However, in the ground with pressurized water, the pressure in the casing pipe, which has risen due to the injection of the grout material every time the casing pipe at the rearmost end is disconnected, suddenly decreases. However, a phenomenon in which the water spouts vigorously with the water under pressure has occurred.

[0006] Then, since this phenomenon reduces the concentration of the grout material in the anchor fixing portion, there has been a demand for a solution therefor. Therefore, the applicant of the present application has previously described Japanese Utility Model Application No. 3-3.
No. 7573 (Japanese Utility Model Laid-Open No. 4-130321) has proposed a rubber mouth packer for preventing the grout material from being blown out by pressurized water during construction of an earth anchor.

The mouth packer is attached to a rear end of an anchor cable inserted into an anchor hole drilled by a drilling machine, and is expanded by injection of compressed air having an air pressure higher than the pressure of water from the anchor hole. Then, the casing tube is pressed against the inner wall of the casing tube to close the inside of the casing tube, and is formed so as to wither by the injection pressure of the grout material injected under pressure at a pressure higher than the pressure of water to be pressurized.

According to such a mouth packer, when compressed air is injected, the mouth packer expands and presses against the inner wall of the casing tube to close the casing tube, but presses the grout material into the anchor hole. When injected, the injection pressure causes the mouth packer to wither, the grout material passes through the gap formed between the mouth packer and the inner circumference of the casing tube, and an earth anchor is gradually created at the anchor anchoring portion in the ground It will be. Then, if the casing tube is pulled out in this injected state, the mouth packer is deflated by the injection pressure of the grout material, so that the casing tube is easily pulled out from the anchor hole.

When the casing tube is pulled out in this manner, the mouth packer fixed to the anchor cable is located in the next connected casing tube. If the rearmost casing tube is removed in this state, the inside of the casing tube is removed. Due to the rapid decrease in pressure, the mouth packer expands instantaneously and presses against the inner circumference of the casing tube, thereby preventing the grout material from being ejected from the anchor hole by the pressurized water.

[0010] Therefore, a grounding anchor is formed in the ground by attaching the pressurizing cap again to the rear end opening of the casing pipe and injecting the grout material into the casing pipe under pressure.

[0011]

However, even with the above-mentioned mouth packer, it is not possible to prevent the grout material from being blown out by pressurized water when the last casing tube is pulled out from the anchor hole and collected. This was left as an issue to be improved.

The present invention has been devised in view of the above-mentioned circumstances, and by improving the above-mentioned mouth packer, when the last casing tube is pulled out from the anchor hole and collected, the injection of the grout material by the pressurized water is ensured. It is an object of the present invention to provide a mouth packer that can be prevented.

[0013]

In order to achieve the above object, a mouth packer according to the present invention is attached to a rear end portion of an anchor tension material inserted into an anchor hole drilled by a drilling machine, and is provided with an anchor hole. Grout which is expanded by injection of compressed air having an air pressure higher than the pressure of water to be pressed from the inside, presses against the inner wall of the casing pipe to close the casing pipe, and is pressurized and injected into the anchor hole at a pressure higher than the pressure of the water to be pressed. A rubber packer molded so as to wither by the injection pressure of the material, and a bag which is attached so as to surround the anchor tension member on the distal end side from the mounting position of the rubber packer, and expands with the injected grout material to close the anchor hole. Characterized in that the cloth packer is connected to a grout material injection pipe passing through the rubber packer through a cuttable injection hose. .

[0014]

According to the present invention, the rubber packer expands with the injected compressed air and presses against the inner wall of the casing tube to close the casing tube. However, when the grout material is injected into the anchor hole, the injection pressure is increased. The rubber packer wither, the grout material passes through the gap formed between the rubber packer and the inner wall of the casing tube, and the ground anchor is gradually created at the anchor anchoring part in the ground . And
If the casing tube is gradually pulled out in this injection state, the rubber tuber is withered by the injection pressure of the cement milk, so that the casing tube can be easily pulled out.

When the entire casing tube is pulled out from the ground, the rubber packer is located in the next connected casing tube. In this state, the rearmost casing tube is removed and the pressurizing cap is removed. May be attached to the rear end opening of the next casing tube.

As described above, by removing the rearmost casing tube, the pressure in the anchor hole rapidly decreases.
The rubber packer instantaneously expands by the air pressure and presses against the inner wall of the casing tube, thereby preventing the injection of the cement milk by the pressurized water from inside the anchor hole.

Then, after the cement milk is again injected into the casing pipe under pressure, the cement milk is pulled out, and the same operation is sequentially repeated for the connected casing pipe according to the drilling depth, so that the anchor fixing portion in the ground is fixed. An earth anchor is gradually formed.

If the grout material is injected into the cloth packer via the grout material injection pipe and the injection hose at the stage where the construction of the earth anchor is advanced and the last casing pipe is pulled out from the anchor hole, the cloth packer expands and anchors. Close the hole.

In such a state, the rubber packer expanding and closing the casing tube is deflated, and the casing tube is pulled out from the anchor hole. At this time, the anchor hole is closed by the cloth packer, and the cloth packer prevents the grout material from being ejected by the water to be pressurized.

Then, the grout material is injected by cutting the injection hose, tightening the cut portion, and removing the rubber packer from the anchor tension member.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a mouth packer according to the present invention. FIG. 1 is a cross-sectional view of an anchor hole showing a state in which an anchor cable has been inserted into a casing pipe after drilling of the ground by a drilling machine. With the inserted anchor cable, a plurality of casing pipes corresponding to the drilling depth are connected to the tip side of the casing pipe 1,
An anchor hole 7 having a desired depth is drilled in the ground 5.

The anchor cable 3 is a PC steel stranded wire composed of seven cables, and at the rear end thereof, a mouth packer 9 for preventing injection of cement milk by pressurized water from the anchor hole 7 is attached. I have.

The mouth packer 9 according to the present embodiment includes a rubber packer 11 and a bag-like cloth packer 13 which is attached so as to surround the anchor cable 3 on the distal end side of the mounting position of the rubber packer 11. As shown in FIGS. 2 and 3, the rubber packer 11 has two circular end plates 15 and 17 facing each other at a predetermined interval, and an anchor penetrating through the center of the two circular end plates 15 and 17. An air chamber 23 having airtightness is formed by the cable insertion tube 19 and the cylindrical rubber film 21 spanned around the outer circumference of both circular end plates 15 and 17, and the rear end opening of the casing tube 1. An air supply pipe 25 containing a check valve (not shown) is inserted into the circular end plate 15 located on the side 1a.

A cement milk injection pipe 27 for supplying cement milk to the cloth packer 13 is inserted between the circular end plates 15 and 17 through the air chamber 23 as described later. .

As shown in FIG. 2, one end of the anchor cable insertion tube 19 opening to the circular end plate 15 is
Is blocked by And anchor cable 3
A central cable 3a passes through the water stop plate 29 and the wedge fixing member 31. The wedge 33 is inserted into the wedge insertion hole of the wedge fixing member 31, and the rubber packer 11 is moved in the direction of arrow A. Movement is regulated.

Further, the anchor cable insertion tube 19
Cable 3a at the center of anchor cable 3 inserted in
The end portions of the six cables 3b to 3g except for the above-mentioned portions respectively press the inner surface of the water stop plate 29 to restrict the movement of the rubber packer 11 in the direction of the arrow B.
The movement in both directions of arrows A and B is regulated, and the rubber packer 11 is fixed to the anchor cable 3.

As shown in FIG. 4, when an air injection hose 35 is connected to the air supply pipe 25 from the rear end opening 1a side of the casing pipe 1 and compressed air is injected into the air chamber 23, as shown in FIG. The rubber packing 21 is pressed against the inner wall 1b of the casing tube 1 when the packer 11 expands, and the casing tube 1 is closed by the rubber packer 11.

Since the rubber packer 11 serves to prevent the injection of cement milk by the pressurized water, the rubber packer 11 expanded as shown in FIG. It is necessary to surely block the inside of 1. Therefore, the rubber packer 1 is injected into the air chamber 23.
The air pressure of the compressed air for expanding 1 is set to a pressure higher than the pressure of the pressurized water.

As described above, the air pressure of the compressed air for inflating the rubber packer 11 is set higher than the water pressure to be compressed. It is set lower than the pressure. That is, generally, the injection pressure of the cement milk is set higher than the water pressure to be pressurized, but the air pressure of the rubber packer 11 in the present embodiment is set to satisfy the relation of the water pressure to be pressed <air pressure <injection pressure.

Therefore, with the rubber packer 11 inflated, a pressure cap 37 is attached to the rear end opening 1a of the casing tube 1 as shown in FIG. When the cement milk is injected into the casing tube 1 from 39 through the cement milk supply hose 41, the rubber packing 1
1 is deflated so that the cement milk passes through a gap 43 formed between the rubber film 21 and the inner wall 1b of the casing tube 1. Then, if the casing tube 1 is pulled out as shown in FIG. 6 in this filling state, the casing tube 1 can be easily pulled out because the rubber packer 11 is withered by the injection pressure of the cement milk.

When all the casing tubes 1 connected to the rearmost end are pulled out from the anchor holes 7, the rubber packer 11 is located in the next casing tube 45 connected to the casing tube 1 as shown in FIG. Therefore, the casing tube 1 may be removed from the casing tube 45 in such a state. Thus, by removing the casing tube 1 in this manner, the pressure in the anchor hole 7 is rapidly reduced, so that the rubber packer 11 expands instantaneously, and the rubber film 21 is formed on the inner wall 45 of the casing tube 45.
a, and the inside of the casing tube 45 is completely sealed.

Accordingly, the rubber packer 11 expands instantaneously to completely seal the inside of the casing tube 45, so that when the casing tube 1 is removed, the cement by the pressurized water from inside the anchor hole 7 is removed. The spouting of milk will be prevented.

On the other hand, the cloth packer 13 constituting the mouth packer 9 of this embodiment together with the rubber packer 11 is
It has the same configuration as a well-known cloth packer. Then, as shown in FIG. 1, the cloth packer 13 is disposed closer to the distal end of the casing tube 1 than the rubber packer 11,
It is attached so as to surround the anchor cable 3.

The cloth packer 13 is connected to the cement milk injection pipe 27 via a cuttable cement milk injection hose 47 having a predetermined length. When the cement milk is injected into the cloth packer 13 via the cement milk injection hose 47, the cloth packer 13 expands with the cement milk and presses against the inner wall 1b of the casing tube 1 to close the casing tube 1. .

In addition, in FIG. 1, 49 is a concrete wall formed on the surface of the ground, and 51 is a mouth pipe inserted into the opening of the anchor hole 7. The lip packer 9 according to the present embodiment is configured as described above. Next, a method of installing an earth anchor using the lip packer 9 will be described.

First, as in the prior art, when the drilling of the ground 5 by the drilling machine is completed as shown in FIG. 1, a cloth packer 13 and a rubber packer 11 are attached to the anchor cable 3 and inserted into the anchor hole 7. I do. The cloth packer 13
Is previously connected to the concrete injection pipe 27 via a cement milk injection hose 47, and the cloth packer 1
3 is arranged at the position of the mouth tube 51.

Then, as shown in FIG. 4, an air injection hose 35 is connected to the air supply pipe 25, compressed air is injected into the air chamber 23, the rubber packer 11 is expanded, and the casing pipe 1 is expanded.
Is closed by the rubber packer 11, and a pressurizing cap 37 is attached to the rear end opening 1 a of the casing tube 1 as shown in FIG. 6, and cement milk is injected from the cement milk inlet 39 of the pressurizing cap 37. Then, the rubber packing 21 is deflated by the injection pressure, and the cement milk passes through the gap 43 formed between the rubber film 21 and the inner wall 1 b of the casing tube 1. Earth anchors will be created gradually. When the casing tube 1 is gradually pulled out as shown in FIG. 6 in this injection state, the rubber tube packer 11 is deflated by the injection pressure of the cement milk, so that the casing tube 1 can be easily pulled out. Note that the air injection hose 35 is removed when the rubber packer 11 is inflated.

When the entire casing tube 1 is pulled out from the ground 5, the rubber packer 11 is located in the next casing tube 45 connected to the casing tube 1 as shown in FIG. Then, the casing pipe 1 is detached from the casing pipe 45, and the pressurizing cap 47 attached to the rear end opening 1a of the casing pipe 1 is removed from the casing pipe 45.
It may be attached to the rear end opening 45b.

Thus, the casing tube 1 is connected to the casing tube 45.
The rubber packer 11 is instantaneously expanded by the air pressure, and the rubber film 21 is pressed against the inner wall 45a of the casing tube 45, thereby completely removing the casing tube 45. Seal tightly. At this time,
Since the air pressure of the compressed air that is expanding the rubber packer 11 is higher than the pressure of the pressurized water, the expanded rubber packer 1
Since 1 keeps closing the inside of the casing tube 45 against the pressure of the pressurized water, the rubber packer 11 prevents the ejection of the cement milk by the pressurized water from inside the anchor hole 7.

Then, after the cement milk is again injected into the casing pipe 45 under pressure, the cement milk is pulled out, and the same operation is sequentially repeated for the connected casing pipes in accordance with the drilling depth, so that the ground 5 in the ground 5 is removed. The ground anchor is gradually formed in the anchor fixing portion.

As described above, the construction of the earth anchor proceeds, and at the stage where the last casing pipe 53 is pulled out from the anchor hole 7 as shown in FIG. 8, the cement milk supply hose 57 equipped with the valve 55 is connected to the cement milk injection pipe. 27
And the cement milk is injected into the cloth packer 13, the cloth packer 13 expands and the inner wall 5 of the mouth pipe 51 is expanded.
1a, and closes the mouth pipe 51.

The cement milk supplied to the cloth packer 13 has moisture oozing out of the cloth and solidifies quickly, but in such a state, the rubber packer 11 which expands as shown in FIG. If the compressed air in the air chamber 23 is evacuated by connecting the air injection hose 35 to the air supply pipe 25, the rubber packer 11 is deflated and the casing pipe 53 can be pulled out, and as shown in FIG.
3 may be pulled out from the anchor hole 7 (mouth tube 51).
At this time, since the mouth pipe 51 is closed by the cloth packer 13, the cement milk in the anchor hole 7 does not blow out from the mouth pipe 51 due to the water to be pressurized.

Then, as shown in FIG. 11, the cement milk injection hose 47 is cut, and the cut portion is tightened so that the cement milk in the cloth packer 13 does not flow backward, so that the wedge 33 fixing the rubber packer 11 is removed. By removing and removing the rubber packer 11 from the anchor cable 3, the operation of injecting the cement milk is completed.

As described above, in the present embodiment, when the earth anchor is installed on the ground 5 where the water to be pressurized is provided, the casing pipe 1 can be pulled up and the connection can be disconnected simultaneously with the injection of the cement milk into the anchor hole 7. For example, when the rubber packer 11 instantaneously expands to completely seal the casing tube 45, and when the last casing tube 53 is pulled out from the anchor hole 7 and collected as shown in FIG. Mouth tube 5
1 is completely sealed, so that when the last casing tube 53 is pulled out and recovered from the anchor hole 7 as compared with the mouth packer disclosed in Japanese Utility Model Application No. 3-37573, the pressure from the anchor hole 7 caused by the pressurized water. It was possible to prevent the spouting of cement milk.

[0045]

As described above, according to the lip packer according to the present invention, the casing pipe is disconnected from the ground where the water is pressurized, similarly to the lip packer disclosed in Japanese Utility Model Application No. 3-37573. However, the present invention can prevent the grout material from being ejected from the anchor hole due to the pressurized water. There is an advantage that it is possible to reliably prevent the grout material from being ejected from the anchor hole by water.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an anchor hole showing a state in which an anchor cable has been inserted into a casing pipe after the ground has been drilled by a drilling machine.

FIG. 2 is a sectional view of a rubber packer.

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

FIG. 4 is a cross-sectional view of the anchor hole showing a state where the rubber packer is expanded.

FIG. 5 is a cross-sectional view of an expanded rubber packer.

FIG. 6 is a cross-sectional view of an anchor hole showing a state in which a rubber packer is deflated by pressure injection of cement milk.

FIG. 7 is a sectional view of an anchor hole showing a state of a rubber packer when a casing tube is removed.

FIG. 8 is a sectional view of an anchor hole showing a state where a rubber packer and a cloth packer are expanded.

FIG. 9 is a cross-sectional view of an anchor hole showing a state where compressed air of a rubber packer is exhausted.

FIG. 10 is a cross-sectional view of the anchor hole showing a state where the last casing tube is pulled out.

FIG. 11 is a cross-sectional view of the anchor hole showing a state where the injection of the cement milk is completed.

[Explanation of symbols]

 1, 45, 53 Casing tube 1b, 45a Inner wall 3 Anchor cable 7 Anchor hole 9 Neck packer 11 Rubber packer 13 Cloth packer 15, 17 Circular end plate 19 Anchor cable insertion tube 21 Rubber film 23 Air chamber 25 Air supply tube 27 Cement milk Injection pipe 29 Water stop plate 35 Air injection hose 37 Pressurizing cap 41,57 Cement milk supply hose 47 Cement milk injection hose

Claims (1)

(57) [Scope of request for utility model registration] An anchor tension member inserted into an anchor hole drilled by a drilling machine is attached to a rear end portion of the anchor tension member, and is expanded by injection of compressed air having an air pressure higher than a pressure of water from the anchor hole. A rubber packer that is pressed against the inner wall of the casing pipe to close the casing pipe, and is formed to wither by the injection pressure of the grout material that is pressurized and injected into the anchor hole at a pressure higher than the water pressure to be applied, and mounting the rubber packer. A bag-like cloth packer which is attached to surround the anchor tension member on the distal end side from the position and expands with the injected grout material to close the anchor hole, and the cloth packer is a grout penetrating the rubber packer. A mouth packer which is connected to a material injection pipe via a cuttable injection hose.