JP6884579B2 - Reach water stop device - Google Patents

Description

The present invention relates to a reach water stop device provided at a reach portion when a tunnel excavator arrives.

When a tunnel excavator represented by a shield excavator reaches a reaching part such as a reaching shaft, the tunnel excavator is safely reached by stopping water so that groundwater and earth and sand do not flow in from the opening of the reaching part. I need to let you. For this purpose, it is common to install a reach water stop device around the opening of the reach portion to reach the reach.

Conventional techniques for the reach water stop device include those shown in FIGS. 11 and 12.
The reach water stop device 100 includes a reach water stop device main body 101, an entrance packing 102, and a wire 104.
The reaching water stop device main body 101 is provided by placing concrete around the wellhead 5a, which is an opening of the reaching wall 5 of the reaching shaft.

The entrance packing 102 is attached to the arrival water stop device main body 101 by a bolt 103. The entrance packing 102 has an elastic ring plate shape and includes a wire 104. The arrival water stop device main body 101 includes an injection pipe 105. As the entrance packing, there is something like Patent Document 1.
The portion of the reaching wall 5 inside the opening of the wellhead 5a is made of a material that can be cut by the cutter 3 of the shield excavator 2. Therefore, the shield excavator 2 that has excavated the ground G can reach it by directly cutting the inner portion of the wellhead 5a.

Then, when the shield excavator 2 penetrates the reaching wall 5 and enters the inside of the reaching wall 5 through the inner circumference of the reaching water blocking device main body 101, the inner peripheral side of the entrance packing 102 is outside the shield excavator 2. It is pulled by the skin plate 4, which is the shell portion. The shape from the base end side to the inner peripheral side attached by the bolt 103 of the entrance packing 102 becomes an inclined shape toward the traveling direction side of the shield excavator 2, and the entrance packing 102 is in close contact with the skin plate 4. To do. As a result, groundwater W and earth and sand D in the ground G are prevented from entering the inside of the reaching shaft. Further, by tightening the wire 104, the entrance packing 102 is further adhered to the skin plate 4 of the shield excavator 2, and the water stopping performance can be further improved.

Special Fair 6-89630 Gazette

In order to stop the water, backfill injection and injection filling by the injection pipe 105 are also performed, but if there is insufficient injection or the like, a large pressure of groundwater W or earth and sand D acts on the entrance packing 102.
In such a reaching water blocking device 100, the shape from the base end side to the inner peripheral side attached by the bolt 103 of the entrance packing 102 becomes an inclined shape toward the traveling direction side of the shield excavator 2, and the entrance packing. Since the direction in which the 102 is pushed by the shield excavator 2 and the direction in which the pressure of the groundwater W and the earth and sand D act are the same, the adhesion between the entrance packing 102 and the skin plate 4 is lowered and the water blocking performance is lowered. There is a risk. In particular, under high water pressure such as deep water, the water stopping performance deteriorates, and the risk of flooding and sediment outflow increases.

The entrance packing 102 is in close contact with the skin plate 4 which is the outer shell portion of the shield excavator 2 to prevent water discharge and sediment outflow, so that the thickness is required, but the followability tends to be lowered accordingly. Therefore, if the earth and sand D or the like is sandwiched between the entrance packing 102 and the skin plate 4, a gap through which the groundwater W and the earth and sand D pass is formed, and the groundwater W and the earth and sand D may flow out from the gap.

When the inner part of the reaching wall 5 that is the opening of the wellhead 5a is made of a material that can be cut by the cutter 3 of the shield excavator 2, it occurs when the shield excavator 2 directly cuts the inner part of the wellhead 5a. The cutting chips 5b may also be sandwiched between the entrance packing 102 and the skin plate 4, and the groundwater W and the earth and sand D may flow out.

The work of tightening the entrance packing 102 to the skin plate 4 of the shield excavator 2 with the wire 104 is dangerous because it is a work of approaching a place where there is a risk of flooding or sediment outflow.

Therefore, an object of the present invention is to provide a water-stopping device for a tunnel excavator, which is more reliable and highly safe, in view of the above-mentioned problems of the prior art.

The invention according to claim 1 of the present application is a reachable water stop device provided at a reach portion reached by a tunnel excavator, and the reach water stop device includes a casing and a sealing material provided on the casing. The casing has a casing opening in which the sealing material is housed therein and is opened in the direction reached by the tunnel excavator so that the outer shell portion of the tunnel excavator can enter , and a position facing the casing opening. The casing has a rear wall, and the sealing material is provided on the outer peripheral side and the inner peripheral side with respect to the outer shell portion that has entered through the casing opening. It has an inner peripheral sealing material, and the outer peripheral sealing material and the inner peripheral sealing material are configured to sandwich the outer shell portion that has entered from the casing opening. It is a water device.

In the invention according to claim 2, when the outer shell portion that has entered through the casing opening is sandwiched, the inner peripheral sealing material moves from the base end side of the inner peripheral sealing material to the outer shell portion side. The arrival water stop device according to claim 1, wherein the shape is inclined toward the direction of travel of the tunnel excavator.

In the invention according to claim 3, at least one of the outer peripheral sealing material and the inner peripheral sealing material is the outer peripheral sealing material or the outer peripheral sealing material when the outer shell portion that has entered through the casing opening is sandwiched. The reachable water blocking device according to claim 1, wherein the shape is inclined toward the traveling direction side of the tunnel excavator from the base end side of the inner peripheral sealing material toward the outer shell side.

In the invention according to claim 4, the casing is provided with a water-stop filling port capable of injecting a water-stop filling material into the inside of the casing, and the water-stop filling port is the outer peripheral sealing material or the outer peripheral sealing material. The reachable water blocking device according to any one of claims 1 to 3, wherein the inner peripheral sealing material is provided on the traveling direction side of the tunnel excavator with respect to the location where the inner peripheral sealing material is provided. ..

The invention according to the claims 5, before Symbol casing rear wall when the shell portion enters from the casing opening, a spacer to secure a distance between the tip and the casing rear wall of the outer shell The reachable water blocking device according to claim 4, wherein the device is provided.

In the invention according to claim 6, the outer peripheral sealing material includes a wire on a surface opposite to the surface in contact with the outer shell portion, and both ends of the wire are not housed in the casing and are exposed. The reachable water stop device according to any one of claims 1 to 5, characterized in that the device is provided.

According to the configuration according to claim 1, water can be stopped not only on the outer peripheral side but also on the inner peripheral side of the outer shell portion of the tunnel excavator in the casing, and even if water outflow or sediment outflow occurs in the outer peripheral sealing material, the inner peripheral seal is provided. Water can be stopped with a material to make it more reliable.

In addition, due to the configuration newly limited in claim 2, it is assumed that water outflow and earth and sand outflow occur in the outer peripheral sealing material, and groundwater and earth and sand wrap around the front end of the outer shell portion of the tunnel excavator in the casing and come to the inner peripheral side. In addition, the direction of the pressure of the groundwater and earth and sand that have sneak around acts in the direction in which the inner peripheral sealing material comes into close contact with the outer shell of the tunnel excavator, so that the water can be stopped more reliably.

In addition, the configuration newly limited in claim 3 allows the outer shell of the tunnel excavator to enter the interior more smoothly through the casing opening.

In addition, the configuration newly limited in claim 4 can further ensure water stoppage.

In addition, according to the configuration newly limited in claim 5, even if the water blocking filling port is provided on one of the outer peripheral sealing material and the inner peripheral sealing material, it is not blocked by the outer shell portion of the tunnel excavator. The waterproof filler can be filled up to the opposite side.

In addition, the newly limited configuration according to claim 6 protects the outer peripheral sealing material by the casing even if water flows out or sediment flows out, so that the work of tightening the outer peripheral sealing material with a wire can be safely performed.

It is a figure seen from the inside of the reaching shaft of the reaching water stop device and AA sectional view in embodiment of this invention. It is an X partial enlarged view in FIG. It is the arrangement side view and BB sectional view of the spacer of the reaching water stop device in embodiment of this invention. It is a figure which showed the installation procedure of the reaching water stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device in embodiment of this invention. It is a figure which shows the arrival method of the shield excavator using the reach stop device of the prior art. It is a figure which shows the arrival method of the shield excavator using the reach stop device of the prior art.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 10 of the drawings. Needless to say, the present invention is not limited to the embodiments.

FIG. 1A shows a state in which the reaching water stop device 1 according to the embodiment of the present invention is attached to the reaching wall 5. FIG. 1A shows a state in which the arrival wall 5 side is viewed from the inside of the arrival shaft.
The reach water stop device 1 has a ring shape as a whole. Then, the center line of the portion forming the ring is arranged on the reaching wall 5 along the wellhead 5a which is the opening. In FIG. 1 (A), the wellhead 5a is shown by a dotted line.

FIG. 1 (B) shows a cross-sectional view taken along the line AA in FIG. 1 (A).
The reaching water stop device 1 is attached to the inside of the five reaching walls (opposite the ground G). The reach water blocking device 1 includes a casing 10, a sealing material composed of an outer peripheral sealing material 20 and an inner peripheral sealing material 30.
The reach wall 5 is made of concrete or the like. The inner portion of the opening, which is the wellhead 5a, is made of a material that can be cut by the cutter 3 of the shield excavator 2.

FIG. 2 is an enlarged view of an X portion of the reaching water stop device 1 in FIG. 1 (B).
The reach water blocking device 1 is configured to house the outer peripheral sealing material 20 and the inner peripheral sealing material 30 which are sealing materials inside the casing 10. The outer peripheral sealing material 20 and the inner peripheral sealing material 30 have a ring shape, and the casing 10 uses these sealing materials on the outer peripheral side (outside the wellhead 5a), the inner peripheral side (inside the wellhead 5a), and the reaching shaft. Cover and store from the inside.
The outer peripheral casing 11 covers from the outer peripheral side, the inner casing 12 covers from the inner peripheral side, and the casing rear wall 13 covers from the inside of the reaching shaft.

The outer peripheral casing 11 has a hollow inside, and includes an outer peripheral casing outer peripheral wall 11a, an outer peripheral casing inner peripheral wall 11b, an outer peripheral casing rib 11c, an outer peripheral casing front wall 11d, and an outer casing rear wall 11e. The outer peripheral casing outer peripheral wall 11a, the outer peripheral casing inner peripheral wall 11b, the outer peripheral casing front wall 11d, and the outer peripheral casing rear wall 11e are made of steel plates and are formed in a ring shape.
The outer peripheral wall 11a of the outer peripheral casing is a cover that constitutes the outermost circumference of the outer peripheral casing 11.

The outer peripheral casing inner peripheral wall 11b is provided along the inner peripheral side of the outer peripheral casing outer peripheral wall 11a at predetermined intervals. The inner peripheral wall 11b of the outer casing is provided with a waterproof filling port 11b1 through which the waterproof filler passes.
An outer casing rib 11c is provided on the outer peripheral side of the outer peripheral casing inner peripheral wall 11b. The outer casing rib 11c is made of an H-shaped steel material and is arranged along the traveling direction of the shield excavator 2. A plurality of outer peripheral casing ribs 11c are arranged at intervals in the circumferential direction of the outer peripheral casing inner peripheral wall 11b. Although not shown, the outer peripheral casing rib 11c may be arranged on the outer peripheral side of the outer peripheral casing inner peripheral wall 11b by forming an H-shaped steel material in a ring shape.

The outer peripheral casing front wall 11d connects the outer peripheral casing outer peripheral wall 11a and the outer peripheral casing inner peripheral wall 11b on the arrival wall 5 surface side. The outer peripheral casing front wall 11d is provided with a flange portion 11d1 on the outer peripheral side of a portion connected to the outer peripheral casing outer peripheral wall 11a. Although not shown, a bolt or the like is used for the flange portion 11d1, and the reaching water stop device 1 is attached to the reaching wall 5.
The outer peripheral casing rear wall 11e connects the outer peripheral casing outer peripheral wall 11a and the outer peripheral casing inner peripheral wall 11b at the inner end of the reaching shaft.

The inner peripheral casing 12 is hollow and includes an inner peripheral casing outer peripheral wall 12a, an inner peripheral casing inner peripheral wall 12b, an inner peripheral casing rib 12c, an inner peripheral casing front wall 12d, and an inner peripheral casing rear wall 12e. .. The inner peripheral casing outer peripheral wall 12a, the inner peripheral casing inner peripheral wall 12b, the inner peripheral casing front wall 12d, and the inner peripheral casing rear wall 12e are made of steel plates and are formed in a ring shape.
The inner peripheral wall 12b of the inner casing is a cover that constitutes the innermost circumference of the inner casing 12.

The outer peripheral wall 12a of the inner peripheral casing is provided along the outer peripheral side of the inner peripheral wall 12b of the inner peripheral casing with a predetermined interval. The outer peripheral wall 12a of the inner peripheral casing is not provided with a water stop filling port through which the water stop filling material passes, but may be provided if necessary.
An inner peripheral casing rib 12c is provided on the outer peripheral side of the inner peripheral casing outer peripheral wall 12a and on the inner peripheral side of the inner peripheral casing inner peripheral wall 12b. The inner peripheral casing rib 12c is made of an H-shaped steel material and is arranged along the traveling direction of the shield excavator 2. A plurality of inner peripheral casing ribs 12c are arranged at intervals in the circumferential direction of the inner peripheral casing outer peripheral wall 12a. Although not shown, the inner peripheral casing rib 12c may be arranged on the outer peripheral side of the inner peripheral casing outer peripheral wall 12a by forming an H-shaped steel material in a ring shape.

The inner peripheral casing front wall 12d connects the inner peripheral casing outer peripheral wall 12a and the inner peripheral casing inner peripheral wall 12b on the arrival wall 5 surface side.
The inner peripheral casing rear wall 12e connects the inner peripheral casing outer peripheral wall 12a and the inner peripheral casing inner peripheral wall 12b at the inner end of the reaching shaft.

The casing rear wall 13 connects the outer peripheral casing 11 and the inner peripheral casing 12 at the inner end of the reaching shaft. The outer casing rear wall 11e and the inner casing rear wall 12e are joined to the casing rear wall 13.
By connecting the outer peripheral casing 11 and the inner peripheral casing 12 to the casing rear wall 13, a casing opening 14 is formed on the reaching wall 5 surface side of the casing 10 of the reaching water blocking device 1.

A sealing material mounting ring 15 is provided in a direction that vertically traverses the outer peripheral casing inner peripheral wall 11b and the outer peripheral casing rib 11c. The sealing material mounting ring 15 is a ring-shaped plate-shaped member. The outer peripheral sealing material 20 is attached to the sealing material mounting ring 15 provided on the outer peripheral casing 11 side.

A mounting ring reinforcing member 16 is provided on the inner peripheral side of the outer peripheral casing inner peripheral wall 11b, which is inside the reaching shaft of the sealing material mounting ring 15. This is for reinforcing the sealing material mounting ring 15 so that it does not bend due to the force acting in the traveling direction of the shield excavator 2. Further, it is also for reinforcing the sealing material mounting ring 15 so as not to be bent by a force in the direction opposite to the traveling direction of the shield excavator 2 which acts by the pressure when the water blocking filler is filled.

A plurality of mounting ring reinforcing members 16 are provided, and are arranged on the inner peripheral side of the outer peripheral casing inner peripheral wall 11b at intervals in the circumferential direction. When the mounting ring reinforcing member 16 is arranged in accordance with the position where the outer peripheral casing rib 11c is arranged, the reinforcing effect is further enhanced. Although not shown, the mounting ring reinforcing member 16 may be arranged in a ring shape on the inner peripheral side of the outer peripheral casing inner peripheral wall 11b.

The sealing material mounting ring 15 and the mounting ring reinforcing member 16 provided on the outer peripheral casing 11 are provided in two rows in the traveling direction of the shield excavator 2.
Similarly, the sealing material mounting ring 15 and the mounting ring reinforcing member 16 provided on the inner peripheral casing 12 are also provided in two rows in the traveling direction of the shield excavator 2.
The sealing material mounting ring 15 and the mounting ring reinforcing member 16 of the outer peripheral casing 11 and the sealing material mounting ring 15 and the mounting ring reinforcing member 16 of the inner peripheral casing 12 do not interfere with the outer peripheral sealing material 20 and the inner peripheral sealing material 30. As described above, the shield excavator 2 is provided so as to be displaced in the traveling direction.

The outer peripheral sealing material 20 includes an outer peripheral entrance packing 21, an outer peripheral packing spacer 22, an outer peripheral swing plate 23, an outer peripheral packing holding member 24, and an outer peripheral packing fixing member 25.
The outer peripheral entrance packing 21 is a ring plate-shaped elastic member. The outer peripheral entrance packing 21 is provided on the reaching wall 5 side of the sealing material mounting ring 15 provided on the outer peripheral casing 11. The outer peripheral entrance packing 21 is attached to the sealing material mounting ring 15 with the outer peripheral side as the base end side. Since the inner peripheral side of the attached outer peripheral entrance packing 21 is in close contact with the skin plate 4 which is the outer shell portion of the shield excavator 2, groundwater and earth and sand are prevented from flowing in.

The outer peripheral packing spacer 22 is provided on the reaching wall 5 side of the outer peripheral entrance packing 21. The outer peripheral packing spacer 22 maintains a distance between the outer peripheral entrance packing 21 and the outer peripheral rocking plate 23 described later. By maintaining the distance, the tilting of the outer peripheral entrance packing 21 and the outer peripheral swing plate 23 is not hindered.

The outer peripheral rocking plate 23 is provided on the reaching wall 5 side of the outer peripheral packing spacer 22. The outer peripheral rocking plate 23 is made of steel and includes an outer peripheral rocking plate base end portion 23a, an outer peripheral rocking plate shaft portion 23b, and an outer peripheral rocking plate swinging portion 23c. The outer peripheral rocking plate base end portion 23a is attached to the outer peripheral packing spacer 22. The outer peripheral rocking plate shaft portion 23b is configured so that the outer peripheral rocking plate swinging portion 23c swings with respect to the outer peripheral rocking plate base end portion 23a. The outer peripheral rocking plate swinging portion 23c swings only in the direction of tilting in the traveling direction of the shield excavator 2 from the posture arranged on the extension of the outer peripheral rocking plate base end portion 23a, and the shield excavator It is designed so that it does not tilt in the direction opposite to the direction of travel of 2.

A plurality of outer peripheral rocking plates 23 are arranged along the circumferential direction of the outer peripheral entrance packing 21. The outer peripheral rocking plate 23 protects the tip of the skin plate 4, which is the outer shell of the shield excavator 2, from directly contacting the outer peripheral entrance packing 21. Further, it has a function of preventing the outer peripheral entrance packing 21 from being turned over to the reaching wall 5 side.

The outer peripheral packing holding member 24 is provided on the reaching wall 5 side of the outer peripheral rocking plate base end portion 23a of the outer peripheral rocking plate 23.
The outer peripheral entrance packing 21, the outer peripheral packing spacer 22, the outer peripheral swing plate 23, and the outer peripheral packing holding member 24 are attached to the sealing material mounting ring 15 provided on the outer peripheral casing 11 by the outer peripheral packing fixing member 25 such as a bolt.

The inner peripheral sealing material 30 is attached to the sealing material mounting ring 15 provided on the inner peripheral casing 12. The inner peripheral sealing material 30 and the outer peripheral sealing material 20 have the same structure except that the mounting position is the outer peripheral or the inner peripheral, and the inner peripheral entrance packing 31, the inner peripheral packing spacer 32, and the inner peripheral swing plate have the same structure. 33 (inner peripheral rocking plate base end portion 33a, inner peripheral rocking plate shaft portion 33b, inner peripheral rocking plate rocking portion 33c), inner peripheral packing holding member 34, and inner peripheral packing fixing member 35 are provided.
The inner peripheral entrance packing 31 is attached to the sealing material mounting ring 15 with the inner peripheral side as the base end side. Since the outer peripheral side of the attached inner peripheral entrance packing 31 is in close contact with the skin plate 4 which is the outer shell portion of the shield excavator 2, groundwater and earth and sand are prevented from flowing in.

With such a configuration, the casing 10 of the reaching water stop device 1 houses the outer peripheral sealing material 20 and the inner peripheral sealing material 30, and enters the skin plate 4 which is the outer shell portion of the shield excavator 2 from the casing opening 14. Can be made to. Then, the entered skin plate 4 can be configured to be sandwiched between the outer peripheral sealing material 20 and the inner peripheral sealing material 30.

The dotted line in FIG. 2 indicates a state in which the skin plate 4 has entered. The entry of the skin plate 4 is performed to such an extent that a gap 50 is left between the tip thereof, the rear wall 13 of the casing, and the gap 50. As shown by the dotted line in FIG. 2, the outer peripheral entrance packing 21 and the inner peripheral entrance packing 31 are pulled by the entered skin plate 4 in the traveling direction of the shield excavator 2 and are attached to the base end side. The shape of the shield excavator 2 is inclined in the traveling direction toward the skin plate 4. Further, as shown by the dotted line in FIG. 2, the outer peripheral rocking plate swinging portion 23c and the inner peripheral rocking plate swinging portion 33c are also formed by the outer peripheral rocking plate base end portion 23a and the inner peripheral rocking plate base end portion 33a. From the postures lined up on the extension, it tilts in the direction of travel of the shield excavator 2.

Groundwater W, earth and sand D, etc. generated by the arrival tend to flow in the traveling direction of the shield excavator 2 on the outer peripheral side of the skin plate 4. Since the outer peripheral entrance packing 21 has a shape that is inclined in the traveling direction of the shield excavator 2 from the outer peripheral side, which is the base end side, toward the skin plate 4, the pressure due to the inflowing groundwater and earth and sand is applied to the outer peripheral entrance. It acts to separate the packing 21 from the skin plate 4. Further, earth and sand D and cutting chips 5b are likely to be caught between the outer peripheral entrance packing 21 and the skin plate 4. Therefore, the water stopping performance is deteriorated, and the groundwater W and the earth and sand D may flow out.

The groundwater W, earth and sand D, etc. that have flowed out from the outer peripheral entrance packing 21 are stopped by the inner peripheral entrance packing 31. The groundwater W, earth and sand D, etc. that have flowed out from the outer peripheral entrance packing 21 tend to flow into the inner peripheral side of the skin plate 4 through the gap 50 in the direction opposite to the traveling direction of the shield excavator 2. Since the inner peripheral entrance packing 31 has a shape that is inclined in the traveling direction of the shield excavator 2 from the inner peripheral side, which is the base end side, toward the skin plate 4, the pressure due to the inflowing groundwater and earth and sand is the relevant. The inner peripheral entrance packing 31 acts to be brought into close contact with the skin plate 4. Further, the amount of earth and sand D and cutting chips 5b that wrap around is reduced, and the inclined shape of the inner peripheral entrance packing 31 makes it difficult for the earth and sand D and cutting chips 5b to be caught between the inner peripheral entrance packing 31 and the skin plate 4. Become. Therefore, more reliable water stopping performance is exhibited. Further, even if there is flooding or sediment inflow, the inside of the reaching shaft is not affected because the entire casing is covered with the casing 10.

The water stop filling port 11b1 is provided on the traveling direction side of the shield excavator 2 with respect to the location of the sealing material mounting ring 15 to which the two rows of outer peripheral sealing materials 20 are mounted. Further, the waterproof filling port 11b1 is also provided on the side opposite to the traveling direction (reach wall 5 side) of the shield excavator 2 of the outer peripheral sealing material 20 provided on the casing opening 14 side.
A plurality of water stop filling ports 11b1 may be arranged at intervals in the circumferential direction of the outer peripheral casing inner peripheral wall 11b.
An injection pipe 40 is provided in the hollow portion of the outer casing 11. The injection pipe 40 penetrates the outer peripheral casing rear wall 11e and the casing rear wall 13 and opens into the waterproof filling port 11b1.

The outer peripheral sealing material 20, the skin plate 4, and the casing rear wall 13 inside the casing 10 are surrounded by the waterproof filling port 11b1 and the injection pipe 40 provided on the traveling direction side of the shield excavator 2 with respect to the outer peripheral sealing material 20. Each of the spaces can be filled with the waterproof filler M.
Water is stopped at the wellhead 5a by the water stop filling port 11b1 and the injection pipe 40 provided on the opposite side (reach wall 5 side) of the shield excavator 2 of the outer peripheral sealing material 20 provided on the casing opening 14 side. Filler M can be filled, allowing additional backfill injection.

The waterproof filler M filled in the space surrounded by the outer peripheral sealing material 20 inside the casing 10, the skin plate 4, and the casing rear wall 13 from the waterproof filling port 11b1 passes through the gap 50 and the inner peripheral sealing material 30. , The space surrounded by the skin plate 4 and the rear wall 13 of the casing is filled. Water can be stopped more reliably by the water blocking filler M.
In the present embodiment, the water stop filling port 11b1 and the injection pipe 40 are provided in the outer casing 11, but may also be provided in the inner casing 12.

As shown in FIG. 3, a spacer 51 may be provided on the rear wall 13 of the casing in order to ensure that the gap 50 is provided. Even if a plurality of spacers 51 are arranged at predetermined intervals in the circumferential direction and the front end portion of the skin plate 4 comes into contact with the rear wall 13 of the casing, the spacer 51 secures the water blocking filler flow path 52 as a gap 50. be able to.

Next, a method of attaching the reaching water stop device 1 to the reaching wall 5 will be described with reference to FIG.
As shown in FIG. 4 (A), the reaching water stop device 1 is attached to the inside of the five reaching walls and at the position of the wellhead 5a. For mounting, the flange portion 11d1 of the outer peripheral casing front wall 11d is fixed with bolts (not shown) or the like. The formwork mounting member 6 is attached to the inner peripheral side of the inner peripheral wall 12b of the inner casing casing. The formwork mounting member 6 may be formed in a ring shape along the inner peripheral side of the inner peripheral wall 12b of the inner peripheral casing, and in this case, it also functions as a reinforcing member of the reaching water stop device 1.
As shown in FIG. 4B, the formwork 7 is attached to the inner peripheral side of the inner peripheral wall 12b of the inner peripheral casing and on the 5th surface side of the reaching wall of the formwork attachment member 6.

As shown in FIG. 4C, a temporary support 8 for supporting the formwork 7 is installed. The temporary support 8 and the formwork mounting member 6 may be connected. The temporary support 8 may be connected to the reaching shaft so as to face the force generated at the time of reaching.
As shown in FIG. 4D, the filler 9 is placed in the space on the arrival wall 5 side of the formwork 7. The filler 9 is for preventing groundwater and earth and sand from flowing into the reaching shaft from a portion where the reaching water blocking device 1 is not provided when the cutter 3 of the shield excavator 2 cuts the inside of the wellhead 5a. .. Fluidized soil or the like is used as the filler 9. Further, it may be a material that can be cut by the cutter 3 of the shield excavator 2.

Next, the arrival method using the arrival water stop device 1 will be described with reference to FIGS. 5 to 10.
FIG. 5 shows a state immediately before the shield excavator 2 reaches the reaching wall 5 of the reaching shaft. In the present embodiment, the ground G has not been improved, but it may be improved if necessary.
The outer peripheral portion 3a of the cutter 3 of the shield excavator 2 is designed to be reduced in the radial direction. Then, by moving the cutter 3 in the direction opposite to the traveling direction of the shield excavator 2, the skin plate 4, which is the outer shell portion of the shield excavator 2, can be made to enter the casing opening 14 of the reaching water stop device 1. It has become like.

As shown in FIG. 6, the shield excavator 2 is advanced, and the inside of the wellhead 5a of the reaching wall 5 is cut by the cutter 3. When the inside of the wellhead 5a is completely cut, the shield excavator 2 is stopped. Since the central portion of the cutter 3 of the shield excavator 2 protrudes, the protruding portion cuts the filler 9. The force due to the progress of the shield excavator 2 is received by the reaching water stop device 1, the filler 9, and the temporary support work 8. If necessary, the force received by the reaching water blocking device 1, the filler 9, and the temporary support 8 may be borne by the other wall of the reaching shaft.

As shown in FIG. 7, the outer peripheral portion 3a of the cutter of the shield excavator 2 is reduced in the radial direction, and the cutter 3 is moved in the direction opposite to the traveling direction of the shield excavator 2. As a result, the front end of the skin plate 4, which is the outer shell of the shield excavator 2, becomes the foremost end of the shield excavator 2.

As shown in FIG. 8, the shield excavator 2 is advanced with the front end of the skin plate 4 as the foremost end, and the skin plate 4 is made to enter the casing opening 14 of the reaching water stop device 1. Then, the skin plate 4, which is the outer shell portion of the shield excavator 2, is sandwiched between the outer peripheral sealing material 20 and the inner peripheral sealing material 30, and the shield excavator 2 is stopped. In this state, as described above, water stoppage on the outer peripheral side and water stoppage on the inner peripheral side of the skin plate 4 are performed.

As shown in FIG. 9, the water blocking filler M is filled in the casing 10 from the injection pipe 40. A mortar or the like is used as the water blocking filler M. As described above, the filling of the water blocking filler M further ensures the water stopping. Further, by filling the water blocking filler M, a force in the direction of coming into close contact with the skin plate 4 acts on the outer peripheral entrance packing 21 and the inner peripheral entrance packing 31, so that more reliable water stopping performance can be exhibited. ..

As shown in FIG. 10, the temporary support 8, the formwork mounting member 6, the formwork 7, and the filler 9 are removed, and the inner peripheral casing 12 and the inner peripheral sealing material 30 of the reaching water stop device 1 are removed. The rear wall 13 of the casing is removed by cutting a portion located on the inner peripheral side of the skin plate 4.
Then, the cutter 3 and the propulsion jack (not shown) of the shield excavator 2 are removed to penetrate the tunnel.

[Other variants]
The present invention is not limited to the above embodiments. For example, the following are also included.

In the present embodiment, the wire that tightens the outer peripheral entrance packing 21 and brings it into close contact with the skin plate 4 is not adopted, but a wire can also be adopted.
In this case, a wire is provided along the circumferential direction on the surface opposite to the surface of the outer peripheral entrance packing that is in close contact with the skin plate. Then, the wires may be crossed near the top end so that both ends of the wires are projected from the openings provided in the outer casing to be exposed. In this way, after the entrance packing is in close contact with the skin plate, the wire can be tightened to further bring it into close contact. Further, even if there is water outflow or sediment outflow during the work of tightening the wire, it is covered with the casing, so that the safety is high.

In the present embodiment, the one to which the reaching water blocking device of the present invention is applied with the reaching wall 5 of the reaching shaft as the reaching portion has been described. However, the present invention is not limited to this, and can be applied to a so-called underground joint in which a shield excavator reaches a stopped shield excavator, and a reachable portion when the shield excavator reaches a tunnel.

In the present embodiment, a shield excavator is applied as a tunnel excavator to reach. However, the present invention is not limited to this, and can be applied to an excavator having a skin plate which is an outer shell portion used in the propulsion method.
It can also be applied to a case such as an excavator in which only a rotary cutter is attached to the tip of a pipe pushed by a main push jack. In this case, when the rotary cutter retracts, the tip of the pipe to be pushed in enters through the casing opening of the reaching water blocking device of the present invention and is sandwiched between the outer peripheral sealing material and the inner peripheral sealing material. , The push-in pipe corresponds to the outer shell portion of the tunnel excavator of the present invention.

In the present embodiment, in order to allow the outer shell portion of the tunnel excavator to enter the casing opening of the water stop device, the cutter is moved in the direction opposite to the traveling direction of the shield excavator, and the shield excavator is set with the skin plate as the front end. I made it progress. However, the present invention is not limited to this, and after reducing the outer peripheral portion of the cutter in the radial direction, the skin plate itself and the slide hood provided on the outer peripheral portion of the skin plate are shielded without moving the cutter and the shield excavator. It may be moved in the traveling direction of the excavator so as to enter the casing opening of the reaching water stop device. In this case, the skin plate or slide hood corresponds to the outer shell of the tunnel excavator of the present invention.

In the present embodiment, the part inside the opening of the wellhead of the reaching wall is formed of a material that can be cut by a cutter of a shield excavator without ground improvement, and is reached by directly cutting with a shield excavator. It was. However, the present invention is not limited to this. For example, the ground outside the reaching wall may be improved in advance, the reaching wall may be mirror-cut, and then the shield excavator may be advanced. In addition, when improved ground appears when mirror cutting is performed, there is a risk that this ground will come off. In such a case, after performing mirror cutting, the formwork 7 and temporary support 8 as shown in FIG. 4 are assembled, and the filler 9 is also filled in the mirror-cut portion, and the filler is filled. The shield excavator may be advanced while cutting 9.

In the present embodiment, the outer peripheral sealing material and the inner peripheral sealing material have been described as being inclined with the progress of the tunnel excavator, but the present invention is not limited to this. For example, at least one of the outer peripheral sealing material and the inner peripheral sealing material may be a hollow tube-shaped material, and the inside of the tube may be filled with a filler and expanded to stop water. Even in this case, since the outer shell portion of the tunnel excavator is sandwiched between the outer peripheral sealing material and the inner peripheral sealing material inside the casing, a water stopping effect is recognized.

Each technical matter in any embodiment may be applied to other embodiments as an embodiment.

1 Reach water stop device 2 Shield excavator 3 Cutter 3a Cutter outer circumference 4 Skin plate 5 Reach wall 5a Wellhead 5b Cutting waste 6 Form mounting member 7 Form frame 8 Temporary support 9 Filler 10 Casing 11 Outer casing 11a Outer outer casing Wall 11b Outer casing Inner peripheral wall 11b1 Water stop filling port 11c Outer casing rib 11d Outer casing front wall 11e Outer casing rear wall 12 Inner peripheral casing 12a Inner peripheral casing outer wall 12b Inner peripheral casing Inner peripheral wall 12c Inner peripheral casing rib 12d Inner peripheral casing Front wall 12e Inner peripheral casing Rear wall 13 Casing rear wall 14 Casing opening 15 Sealing material mounting ring 16 Mounting ring reinforcement member 20 Outer peripheral sealing material 21 Outer peripheral entrance packing 22 Outer peripheral packing spacer 23 Outer peripheral rocking plate 23a Outer peripheral rocking plate base end Part 23b Outer swing plate shaft part 23c Outer swing plate swing part 24 Outer packing holding member 25 Outer packing fixing member 30 Inner circumference sealing material 31 Inner circumference entrance packing 32 Inner circumference packing spacer 33 Inner circumference rocking plate 33a Inner circumference Rocking plate base end 33b Inner circumference rocking plate shaft 33c Inner circumference rocking plate rocking part 34 Inner circumference packing holding member 35 Inner circumference packing fixing member 40 Injection pipe 50 Gap 51 Spacer 52 Water-stop filler flow path G Ground S segment W Groundwater D Sediment

Claims (6)

It is a water stop device that is installed at the reach of the tunnel excavator.
The reach water blocking device includes a casing and a sealing material provided on the casing.
The casing is located at a position facing the casing opening and a casing opening in which the sealing material is housed and opened in the direction reached by the tunnel excavator so that the outer shell portion of the tunnel excavator can enter. Has a casing rear wall ,
The sealing material has an outer peripheral sealing material provided on the outer peripheral side and an inner peripheral sealing material provided on the inner peripheral side with respect to the outer shell portion that has entered from the casing opening.
The reachable water blocking device, wherein the outer peripheral sealing material and the inner peripheral sealing material are configured to sandwich the outer shell portion that has entered through the casing opening. When the outer shell portion that has entered through the casing opening is sandwiched, the inner peripheral sealing material moves toward the tunnel excavator traveling direction side from the base end side of the inner peripheral sealing material toward the outer shell portion side. The reachable water blocking device according to claim 1, wherein the shape is inclined. At least one of the outer peripheral sealing material and the inner peripheral sealing material is the base end side of the outer peripheral sealing material or the inner peripheral sealing material when the outer shell portion that has entered through the casing opening is sandwiched. The reaching water stop device according to claim 1, wherein the shape is inclined toward the traveling direction side of the tunnel excavator toward the outer shell portion side. The casing is provided with a waterproof filling port capable of injecting a waterproof filler into the casing.
Any of claims 1 to 3, wherein the waterproof filling port is provided on the traveling direction side of the tunnel excavator with respect to a portion where the outer peripheral sealing material or the inner peripheral sealing material is provided. The reachable water stop device according to item 1. Before SL casing rear wall, wherein said shell portion when entering from the casing opening, characterized in that it comprises a spacer to secure a distance between the tip and the casing rear wall of the outer shell Item 4. The reaching water stop device according to item 4. The outer peripheral sealing material is provided with a wire on a surface opposite to the surface in contact with the outer shell portion.
The reachable water stop device according to any one of claims 1 to 5, wherein both ends of the wire are not housed in the casing and are exposed.

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