JP2001107370A - Joint sealing method for caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and quickly perform filling works of sealant into a seal member during inserting works or after completing the insertion of the seal member relative to a bored hole with the bore set to small. SOLUTION: A hole penetrated vertically is bored in a joint part 1 between a caisson 3 and a caisson 3, a seal member 7 whose inner space being a cylindrical state normally is decompressed and set into a vertically long belt plate is inserted into the bored hole 5 from the above, and after completing the insertion of the seal member 7, the inside of the seal member 7 is forcedly filled with sealant by applying the pressure from the above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson joint sealing method suitable for repairing a damaged joint.

[0002]

2. Description of the Related Art There is a joint having a slight gap between caissons arranged in series, and the joint is sealed by a filled sealing material.

[0003]

After the installation, the joint of the caisson is sealed by filling with a sealing material. However, at the initial stage of the installation, or at an unstable installation site, the joint is affected by waves or the like. Due to the movement, poor sealing occurs with the passage of time.

[0004] A portion where a seal failure has occurred is repaired. A general method of repair is to make a hollow hole vertically penetrating the joint of the caisson, insert a vertically long bag-shaped sealing member made of rubber from the top into the hollow hole, and insert the cylindrical body After completion, inside the seal member,
For example, there is a means for filling the asphalt mastic so as to seal the hollow hole through a sealing member.

[0005] Alternatively, a vertically long cylindrical body is inserted into the hollow hole from above, and after the insertion of the cylindrical body is completed, a sealing material such as asphalt mastic is poured from above the cylindrical body. There is a means for directly sealing the hollow hole with a material.

The former means is suitable for places where the installation of the caisson is not stable because the sealing state can be ensured even if there is slight movement by the rubber sealing member.
The latter method is suitable for a place where the caisson is stably installed, but the caisson is large and has a height of about 15 m, and the hollow hole for sealing needs to be securely sealed over the area of 15 m.

In the former case, when the bag-shaped sealing member is inserted into the hollow hole from above, it comes into contact with the hollow hole, and it takes a long time for the insertion operation. In this case, the insertion operation is facilitated by increasing the diameter of the hollow hole, but on the other hand, the sealing material must be additionally filled by the increased diameter, which is not desirable in terms of cost. Also, machining of the hollow hole is troublesome and time-consuming.

In addition, since the bottom region of the seal member after the completion of the insertion is brought into close contact under the influence of water pressure, when filling from above, each becomes a resistance to injection and takes a long time to fill. Not desirable in terms of surface.

In the latter case, if the diameter of the cylindrical body is small, there is a possibility that the sealing material may be clogged on the way. vice versa,
Increasing the diameter will not cause clogging, but will require extra sealing material, leading to increased costs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for sealing a caisson joint, which requires a small hole and allows the sealing material to be filled quickly and reliably.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a vertically penetrating hole is cut out in a joint between caissons, and a hole is formed in the joint hole. The inner space, which is always in a cylindrical state, is depressurized and brought into close contact, and a vertically long strip-shaped sealing member is inserted from above.After the insertion of the sealing member is completed, pressure is applied from above to the inside of the sealing member To forcibly fill the sealing material.

[0012] Thus, the sealing member has a small strip-like shape due to the vertically long band-like shape, and the insertion into the hollow hole is completed quickly. After the insertion is completed, the sealing material is forcibly filled by pressure. At this time, since the internal space of the seal member is in a depressurized state where the air is evacuated, the injection resistance of the seal material does not work, and the filling operation is completed smoothly.

According to a second aspect of the present invention, the seal member is detachably attached to the injection port of the suspension tank which can be suspended.

Thus, the seal member can be inserted into the hollow while the seal member and the injection tank are suspended together. After the insertion is completed, the filling operation of the sealing material can be continuously performed.

According to the third aspect of the present invention, the injection tank is connected to the pressure reducing means for reducing the internal space of the seal member and the pressure means for applying pressure to the inside of the injection tank.

Thus, the internal space of the seal member mounted on the injection tank can be easily depressurized by the decompression means. Further, after the insertion into the hollow, the sealing member can be reliably and quickly filled into the inside of the sealing member by the pressure means.

According to the fourth aspect of the present invention, the bottom surface of the sealing member is opened by peeling off the joint surface with the bottom portion after a certain period of time by water.

[0018] Thus, after filling the inside of the seal member set in the hollow hole with the seal member, the seal member is pulled up, so that the seal member can be directly sealed. For this reason, it is suitable for a caisson seal whose installation is stable, and the seal member can be used repeatedly, which is very preferable in terms of cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 6 is a schematic plan view showing the joint 1 between the caisson 3 and the caisson 3. In the center of the joint 1, a hollow hole 5 penetrating vertically is provided. I have. By the way, the diameter of the conventional hollow 5 is 300 m.
In this embodiment, it is about half of 150 mm.

The hollow 5 is sealed by a seal member 7 as shown in FIGS.
Inside the asphalt mastic by the injection tank 11 suspended by the crane truck 9, or
Sealing material such as asphalt emulsion is filled.

The sealing member 7 is made of an elastically deformable rubber material into a cylindrical shape having a bottom 7a, and has an opening 7b at the top. As the rubber material, either a natural material or a synthetic resin may be used.

The injection tank 11 has an injection port 13 at the lower part,
An opening 15 is provided at the upper part, and can be suspended by a boom 19 of the crane truck 9 via a suspension wire 17 attached to the tank body.

The opening 15 of the injection tank 11 is connected to the hinge 2
1 has an opening / closing door 23 that can be opened / closed with a fulcrum,
3 is an opening 1 by rotating the handle 25 after closing.
5, so that a reliable airtight state is ensured.

Compressed air is fed into the tank body of the injection tank 11 by a compressor 29 serving as a pressure means 27. A pipe 31 connecting the tank body and the compressor 29 has It has a valve 33 and a pressure adjusting device 35 for sending out a constant pressure. In addition,
The pipe 31 is bendable and flexible, and is set to a length that does not cause any trouble when the injection tank 11 is suspended.

An opening / closing valve 39 for switching the injection port 13 between a state in which the injection port 13 is closed in an airtight state and a state in which the injection port 13 is opened by operating a handle 37 is provided at the injection port 13 of the injection tank 11.
A vacuum pump 43 serving as a pressure reducing means 41 causes the inlet 1
The inside air of the seal member 7 mounted on the suction member 3 is sucked and decompressed. An opening / closing valve 47 is provided in a pipe 45 connecting the inlet 13 and the vacuum pump 43. The pipe 45 is bendable and flexible, and is set to a length that does not cause any trouble when the injection tank 11 is lifted.

The upper opening 7b of the seal member 7 attached to the inlet 13 is kept airtight by a hose clip 49.

Next, a method of sealing the joint portion 1 of the caisson 3 will be described. First, a hollow hole 5 vertically penetrating about half the diameter of a conventional hole is provided substantially at the center of the joint 1 between the caissons 3. Next, the injection port 13 of the injection tank 11 is closed, and a sealing material such as asphalt mastic or asphalt emulsion is put into the upper opening port 15 and then the opening / closing lid 23 is closed. Next, the injection tank 11 is lifted halfway by the crane truck 9, and the seal member 7 is attached to the injection port 13. After the mounting is completed, the vacuum pump 43 serving as the pressure reducing means 41 is operated to suck the air inside the seal member 7. During suction of the internal air, the inlet 13 is closed, so that a reliable suction state can be obtained. At this time, since the inside of the seal member 7 is exhausted, the seal member 7 comes into close contact with each other and has a long strip shape as shown in FIG. 2, so that the seal member 7 is dropped from above the hollow hole 5. At this time, since the sealing member 7 has a vertically long strip shape, a large contact resistance with the hollow hole 5 does not occur, and the sealing member 7 can be quickly inserted. In this case, it is desirable to put a weight such as sand on the bottom of the seal member 7.

Thus, the insertion operation can be performed more quickly.

Next, after the insertion of the sealing member 7 is completed, the insertion port 13 is opened, and compressed air is sent into the injection tank 11 by the compressor 29 serving as the pressurizing means 27. Thereby, the sealing material in the injection tank 11 is forcibly injected into the internal space of the sealing member 7 by the pressure. At the time of this injection, since there is no air inside the seal member 7, injection resistance does not occur and the sealing member 7 is smoothly filled. The filling amount at this time can be reduced because the diameter of the hollow hole 5 is smaller than in the conventional case. After the filling is completed, the sealing member 7 is removed from the inlet 13 and the upper opening 7b is closed to complete the sealing operation.

FIGS. 7 and 8 show a second embodiment of the seal member 7. FIG.

That is, the bottom of the sealing member 7 is glued, and after a certain period of time, the glued bottom joining surface P is peeled off.
It has a structure that opens.

The other components are the same as those shown in FIG. 4, and therefore, are denoted by the same reference numerals and will not be described in detail.

Therefore, according to the second embodiment, the sealing member 7 is filled with the reduced-pressure sealing member 7. At the time of this filling, the filling operation is completed smoothly and promptly.

After the filling is completed, the injection tank 11 is pulled up together with the sealing member 7. At the time of this pulling up, the bottom joining surface P of the sealing member 7 is peeled off, the filled sealing material remains as it is, and the sealed state of the hollow 5 is ensured.

For this reason, the sealing member 7 can be used repeatedly for the filling operation of the next sealing material, which is very preferable in terms of cost.

[0037]

As described above, according to the caisson joint sealing method of the present invention, the diameter of the hollow can be reduced, and the operation of inserting the sealing member can be completed quickly. Can be. For this reason, machining of the hollowed hole becomes easy. In addition, since only a small amount of sealing material is used, it is very preferable in terms of workability and cost.

Further, the sealing material is reliably applied to the sealing member.
In addition, filling can be performed quickly, and work efficiency can be greatly improved.

Since the bottom surface of the sealing member is peeled off after a certain period of time with water, the sealing material can be pulled up together with the injection tank with the sealing material remaining after the filling of the sealing material. , A direct sealing state is obtained.

Moreover, since the sealing member can be used in the next sealing operation, it is very preferable in terms of cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method of sealing a joint of a caisson according to the present invention, and an operation explanatory diagram in which a sealing member is attached to an inlet.

FIG. 2 is an explanatory view of an operation in which an injection tank is lifted.

FIG. 3 is an operation explanatory view in which a seal member is inserted into a hollow hole.

FIG. 4 is an explanatory diagram in which a pressurizing unit and a depressurizing unit are connected to an injection tank.

FIG. 5 is an explanatory view showing a state in which a hollow hole is sealed by a seal member.

FIG. 6 is a schematic plan view in which a hollow is provided in a joint between caissons.

FIG. 7 is an explanatory view similar to FIG. 4, showing a second embodiment of the seal member.

FIG. 8 is an explanatory view of an operation in which a seal member is pulled up from a hollow hole.

[Explanation of symbols]

 1 joint area 3 caisson 5 hollow hole 7 seal member

Claims (4)

[Claims] 1. A vertically penetrating hole is cut out in a joint portion between caissons, and an inner space which is always in a cylindrical state is depressurized and adhered to the cut-out hole to form a vertically long strip-shaped plate. A sealing method for caisson joints, wherein a sealing member is inserted from above, and after the insertion of the sealing member is completed, pressure is applied from above to the inside of the sealing member to forcibly fill the sealing material. 2. The caisson joint sealing method according to claim 1, wherein the sealing member is detachably attached to an injection port of a suspension tank that can be suspended. 3. The caisson joint seal according to claim 2, wherein the injection tank is connected to a pressure reducing means for reducing the internal space of the sealing member and a pressure means for applying pressure to the inside of the injection tank. Method. 4. A method for sealing a joint of a caisson according to claim 1, wherein the bottom surface of the sealing member is peeled off and opened after a lapse of a predetermined time by water. .