JP6038531B2 - Backing material injection method and backing material injection device - Google Patents

Description

  The present invention relates to a backing material injection method and a backing material injection device in a shield method.

Conventionally, in excavation by a shield machine, a backing material is filled in an annular gap (tail void) between an inner peripheral surface of a drilling hole excavated by a cutter at the tip thereof and an outer peripheral surface of a segment to be installed, We try to prevent problems such as intrusion into the spring water segment and land subsidence.
As a method of injecting the backing material, a simultaneous backing material injection method in which the backing material is injected almost simultaneously with the generation of the tail void, and a backing material injection of the segment located at a position behind the rear body of the shield machine There is known an immediate back material injection method for injecting a back material from a hole.
In particular, the simultaneous backing material injection method does not require desorption work of the injection nozzle into the backing material injection hole every time it progresses, so it improves work efficiency and reduces the cost of tunnel construction compared to the immediate backing material injection method. It is advantageous in planning.

JP 2010-59607 A JP 2000-170495 A

On the other hand, the simultaneous backing material injection method has a structure in which the backing material injection part of the backing material injection device is attached to the outer peripheral surface of the rear body part of the shield machine, and after the backing material injection part is attached The portion of the body portion protrudes outward in the radial direction of the rear body portion.
For this reason, there is no problem when excavating soft ground, but when it is necessary to advance to hard ground such as rock during the excavation, the backfill material injection part hits the inner periphery of the excavated hole and There is a problem that the excavation by the shield machine cannot be performed smoothly because the material injection part is damaged.
The present invention has been devised in view of the above circumstances, and the object of the present invention is to inject a backing material that is advantageous for smoothly and efficiently digging a shield machine even when progressing from a soft ground to a hard ground. It is to provide a method and a backing material injection device.

In order to achieve the above object, the method of injecting a backing material according to the present invention comprises forming an opening penetrating the rear body portion in a rear body portion of a shield machine having a cutter at the tip, A first backing material injection portion and an immediate backing material injection method for arranging a simultaneous backing material injection method capable of being connected and separated to the backing material supply portion while arranging a material supply portion inside the rear trunk portion A second backing material injection portion for implementation, and when the shield machine digs a soft ground, the first backing material injection portion is radially outward from the opening to the rear trunk portion. And the backing material supply part and the first backing material injection part are connected to inject the backing material from the first backing material injection part into the tail void, and the shield machine is soft When proceeding from the ground to the hard ground, the first backing material injection portion is stored in the rear trunk portion. And in the stowed position, the opening is closed with an outer portion located on the outer side in the radial direction of the rear trunk, and the outer portion is attached to the rear trunk with the opening closed. Furthermore, the inner part which is the remaining part of the first backing material injection part excluding the outer part is removed from the outer part, and the backing material supply part and the second backing material injection part are The back material is injected into the tail void through the back material injection hole of the segment located behind the rear body portion by the second back material injection portion while connecting and digging. It is characterized by that.
Further, the backing material injecting device of the present invention includes a backing material supply unit disposed inside a rear body part of a shield machine having a cutter at a tip, an opening formed through the rear body part, An injection position that protrudes radially outward of the rear body from the opening and allows the back material to be injected into the tail void, and a storage position that is housed in the rear body from the opening and closes the opening A first backing material injecting section that is movably provided between and connected to and separated from the backing material supply section, and a holding means for holding the first backing material injecting section at the injection position. A second backing material injecting portion connectable to and separated from the backing material supply portion and connectable to a backing material injecting hole of a segment located at a position distant from the rear body portion, 1 of the backing material injection portion is located outside the rear trunk portion in the radial direction in the storage position. The opening portion can be closed at a side portion, and the outer portion can be attached to the rear trunk portion in a state where the opening portion is closed, and the first backing material injection excluding the outside portion is configured. The inner part, which is the remaining part of the part, is configured to be removable from the outer part.

In the present invention, when the cider machine digs a soft ground, the first backing material injection portion is set as the injection position, the backing material is injected from the first backing material injection portion into the tail void, and the simultaneous backing material injection is performed. Implement the method.
When the cider moves from a soft ground to a hard ground, the first back-filling material injection part is used as the storage position, the protrusions are removed from the outer peripheral surface of the rear trunk part, the inner part is removed from the outer part, and the rear trunk part is removed. By removing the portion of the first backing material injection portion that protrudes inside the portion, a wide space is secured in the rear trunk portion.
Then, while digging, the backing material is injected into the tail void from the second backing material injection part through the backing material injection hole of the segment separated to the rear of the rear trunk part, and the immediate backing material injection method is carried out To do.
Therefore, the excavation by the shield machine from the soft ground to the hard ground is smoothly and efficiently performed.

(A) is a side view of a state in which the shield machine is digging while performing the simultaneous backing material injection method, and (B) is a view of the shield machine from the rear of the rear trunk. (A) sets the first backing material injection portion as the storage position, separates the backing material supply portion and the first backing material injection portion, and provides the backing material supply portion and the second backing material injection portion; The side view of the state which connected, (B) is the figure which looked at the shield machine from the back of a rear trunk | drum. (A) is a side view of the state where the shield machine is digging while removing the inner part from the outer part and performing the immediate backing material injection method, (B) is a view of the shield machine from the rear of the rear trunk. is there.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the shield machine 10 includes a front body portion 12 having a cutter 1202 at the front end, and a rear body portion 14 connected to the front body portion 12 so as to be bent.
A motor for rotating the cutter 1202 and a conveyor device for discharging excavated earth and sand are arranged inside the front trunk portion 12, and an erector for assembling the segment C and a jack for excavation are arranged inside the rear trunk portion 14. Is arranged.
The segment C is provided with a backing material injection hole regardless of whether or not it is used, and the backing material injection hole is closed with a stopper.

A rectangular opening 16 that is long in the front-rear direction is provided at the front and upper portion of the rear trunk portion 14.
The opening 16 is formed by an inner peripheral portion of a rectangular frame-shaped packing 18 attached to a rectangular cutout of the rear trunk portion 14.
Further, as shown in FIG. 1, a wire brush 20 is provided on the inner peripheral surface of the rear end of the rear trunk portion 14.
The wire brush 20 holds the inside of the rear trunk portion 14 in a watertight manner against the tail void 22 that is an annular space between the inner peripheral surface of the excavation hole 19 and the outer peripheral surface of the segment C. Intrusion into the portion 14 is prevented.

The backing material injecting device 24 fills the tail void 22 with the backing material and prevents intrusion of spring water into the segment C or ground subsidence.
The backing material injection device 24 includes a backing material supply unit 26, a first backing material injection unit 30 for performing a simultaneous backing material injection method that can be connected to and separated from the backing material supply unit 26, FIG. And a second backing material injection portion 32 for carrying out the immediate backing material injection method shown in FIG.
As the backing material, various conventionally known materials such as a material in which materials are mixed in advance such as mortar and a material in which a curing agent is mixed with a main agent immediately before injection can be used.
Moreover, the injection | pouring part of various structures for implementation of the conventionally well-known simultaneous backing material injection | pouring method corresponding to a backing material is employable as the 1st backing material injection | pouring part 30. FIG.
Further, the second backing material injecting section 32 can employ various configurations of injecting sections for carrying out a conventionally known immediate backing material injecting method corresponding to the backing material.

The backing material supply unit 26 is disposed inside the rear trunk unit 14.
The backing material supply unit 26 includes a backing material storage tank 2602, a piping 2604 that detachably connects the storage tank 2602 and the first and second backing material injection units 30, 32, and a back of the storage tank 2602. A pump 2606 for pumping the filling material to the injection passages of the first and second backing material injection portions 30 and 32 via the pipe 2604, a washing water tank 2608 for washing water for washing the piping 2604 and the injection passage, A pump 2610 and a pipe 2612 for pumping the cleaning water in the tank 2608 to the first and second backing material injection sections 30 and 32 are configured.
The tip portions of the pipes 2604 and 2612 can be connected and separated from the first and second backing material injection portions 30 and 32 via the joint 34. More specifically, a ball valve (open / close valve) 36 is provided at the tip of the piping on the first and second backing material injecting portions 30 and 32 side, and at the tip of the piping on the backing material supply portion 26 side. A ball valve (open / close valve) 38 and a joint 34 are provided, and a ball valve 36 at the tip of the piping on the first and second backing material injection portions 30 and 32 side is detachably coupled to the joint 34.

The first backing material injection part 30 is movable between an injection position (A) for injecting the backing material into the tail void 22 and a storage position (B) stored in the rear trunk part 14. . The movement of the first backing material injection unit 30 may be performed manually or an actuator such as a hydraulic cylinder may be used.
At the injection position (a) of the first backing material injection portion 30, the first backing material injection portion 30 (in detail, an inner portion 30B of the first backing material injection portion 30 described later) and the rear trunk portion. 14, the L-shaped bracket 40 is detachably attached via a bolt, as shown in FIG. 1B, and the injection position (A) of the first backing material injection portion 30 is held. The Therefore, in the present embodiment, the holding means for holding the first backing material injection part 30 at the injection position (A) is constituted by the bracket 40 and the bolt. In addition, when the first backing material injection part 30 is moved from the injection position (b) to the storage position (b) by the actuator, the first backing material injection part 30 is held at the injection position (b). This actuator can be used as a holding means.
The first backing material injecting portion 30 includes an outer portion 30A located radially outside the rear trunk portion 14 in the storage position (b), and the rest of the first backing material injecting portion 30 excluding the outer portion 30A. The inner portion 30B is detachable from the outer portion 30A via a bolt or the like.

The outer portion 30A includes an outer plate portion 3002 and an inner plate portion 3004.
As shown in FIG. 2, the outer plate portion 3002 abuts the outer peripheral surface of the rear body portion 14 around the opening portion 16 in the storage position (b) to close the opening portion 16, and is shown in FIG. 3. As described above, the outer plate portion 3002 is detachably attached to the rear trunk portion 14 from the inside of the rear trunk portion 14 via the bolt B1 with the opening 16 closed.
The outer plate part 3002 is formed of a cylindrical surface centered on the axis of the rear body part 14 and protrudes radially outward of the rear body part 14 at the storage position (b). The volume of 30 is reduced.

In the storage position (b), the outer plate portion 3002 has an outer surface 3002A that faces the outer side of the rear trunk portion 14 in the radial direction.
And in the injection | pouring position (I), the location located in the front end side of the shield machine 10 of the outer surface 3002A is located in the place near the outer peripheral surface of the rear trunk | drum 14, and it goes to the location located in the back side of the shield machine 10. It is arranged so as to be gradually inclined so as to be displaced radially outward of the rear body portion 14.
The inner plate portion 3004 protrudes from the outer plate portion 3002, contacts the edge of the opening 16 (inner peripheral portion of the packing 18) at the storage position (b), and from the opening 16 such as spring water or earth and sand. The penetration | invasion to the inside of the rear trunk | drum 14 is prevented.

The inner portion 30B can be attached to and detached from the inner plate portion 3004 via a bolt or the like, and the inner portion 30B can be attached to the inner plate portion 3004 at the edge of the opening 16 at a place other than the storage position (b). It is always in contact with the part (inner peripheral part of the packing 18), and prevents intrusion into the rear trunk part 14 from the opening 16 such as spring water or earth and sand.
The inner portion 30B is provided with an injection path for the backing material to which the pipes 2604 and 2612 of the backing material supply unit 26 are connected. On the rear side surface of the inner portion 30B, as shown in FIG. Further, a discharge port 3010 for the backing material is provided.

Next, a back material injection method using the back material injection device 24 will be described.
When digging a soft ground with the shield machine 10, as shown in FIG. 1, the first backing material injecting portion 30 is injected by the bracket 40 using the first backing material injecting portion 30 as the injecting position (A) ( B).
Then, the backing material supply unit 26 and the first backing material injection unit 30 are connected by the piping 2604 for the backing material, and the backing material is supplied from the first backing material injection unit 30 almost simultaneously with the generation of the tail void 22. A simultaneous backing material injection method is performed.
In the present embodiment, at the injection position (A), the first backing material injection portion 30 is inclined so as to be gradually displaced outward in the radial direction of the rear trunk portion 14 toward the rear. The resistance of the first backing material injection part 30 with respect to the inner peripheral part of 19 is small, which is advantageous for smoothly digging the shield machine 10.

When it is necessary to advance from a soft ground to a hard ground such as a rock in the course of excavation, the pump 2606 is stopped and injection of the backing material from the first backing material injection unit 30 to the tail void 22 is stopped.
And as shown in FIG. 2, let the 1st back material injection | pouring part 30 be an accommodation position (b).
Further, the ball valves 36 and 38 are closed, respectively, and the tip of the backing material pipe 2604 is separated from the first backing material injection part 30 through the joint 34, and the backing material pipe 2604 is connected through the joint 34. Is connected to the ball valve 36 of the second backing material injection unit 32, and the backing material supply unit 26 and the second backing material injection unit 32 are connected.

Further, as shown in FIG. 3, the outer plate portion 3002 is attached to the rear trunk portion 14 with bolts B1.
Further, the inner portion 30B that is no longer used is cut off from the inner plate portion 3004 and removed.
Thereby, since the part of the 1st backing material injection | pouring part 30 which protrudes in the radial direction inner side of the back trunk | drum 14 is lose | eliminated, the space in the rear trunk | drum 14 is ensured widely.
Therefore, it becomes easy to perform various operations in the rear trunk portion 14 such as a segment assembling operation, which is advantageous in smoothly performing excavation by the shield method.

Then, the plug of the backing material injection hole of the segment C corresponding to the portion where the backing material is not injected is removed, and the tail void 22 is passed from the second backing material injection portion 32 through the backing material injection hole of the segment C. Inject the backing material.
That is, as shown in FIG. 3, this time, an immediate backing material injection method for injecting the backing material into the tail void 22 from the backing material injection hole of the segment C separated behind the rear trunk portion 14 while digging. Do.
Therefore, when excavating a hard rock mass, there is no protrusion on the outer peripheral surface of the rear trunk portion 14, and the excavation by the shield method is smoothly performed.
In this embodiment, when digging a hard bedrock, the first backing material injection part 30 is changed from the injection position (A) to the storage position (B), and the storage position (B) is shown in FIG. As described above, since the outer surface 3002A of the first backing material injecting portion 30 extends along the outer peripheral surface of the rear trunk portion 14, it projects outward in the radial direction of the rear trunk portion 14 when the hard rock is dug. Since the volume of the location of the 1st backing material injection | pouring part 30 becomes very small, the excavation by a shield construction method is performed smoothly.

  In the present embodiment, the case where the shield machine 10 digs from the soft ground to the hard ground has been described. However, the outer portion 30A is configured to be detachable from the rear trunk portion 14 in the storage position (b), and the outer side If the inner portion 30B is configured to be detachable with respect to the portion 30A, the simultaneous backing material injection method is performed with the first backing material injection portion 30 as the injection position (a) in the soft ground, and the first in the hard ground. When the first backing material injection part 30 is set to the storage position (b) and the second backing material injection part performs the immediate backing material injection method, soft ground and hard ground appear alternately during excavation. In addition, the excavation by the shield method can be performed smoothly and efficiently.

  DESCRIPTION OF SYMBOLS 10 ... Shield machine, 12 ... Front trunk | drum, 14 ... Rear trunk | drum, 16 ... Opening part, 18 ... Packing, 22 ... Tail void, 24 ... Backing material injection apparatus, 26 ... Backing up Material supply section, 2602 .. Backing material storage tank, 2604 .. Backing material piping, 2606... Backing material pump, 2608 .. Washing water tank, 2610 .. Cleaning water pump, 2612. Pipe for cleaning water, 30... First back material injection part, 30 A... Outer part, 30 B... Inner part, 3002 ... outer plate part, 3004 ... inner plate part, 32. Glue injection part, C ... segment.

Claims (7)

In the rear trunk of the shield machine having a cutter at the tip, an opening that penetrates the rear trunk is formed,
A first backing material injection for carrying out a simultaneous backing material injection method capable of being connected to and separated from the backing material supply portion while arranging a backing material supply portion of the backing material injection device inside the rear trunk portion And a second backing material injection part for carrying out the immediate backing material injection method,
When the shield machine digs up the soft ground, the first backing material injecting portion protrudes radially outward of the rear trunk portion from the opening, and the backing material supply portion and the first backing material are projected. Injecting the backing material into the tail void from the first backing material injecting portion by connecting the filling material injecting portion,
When the shield machine proceeds from a soft ground to a hard ground, the first backing material injection portion is set to a storage position stored inside the rear trunk portion, and a radius of the rear trunk portion is stored in the storage position. The opening portion is closed by an outer portion located outside the direction, and the outer portion is attached to the rear trunk portion in a state where the opening portion is closed, and further, the first back cover except for the outer portion The inner part which is the remaining part of the material injection part is removed from the outer part, the backing material supply part and the second backing material injection part are connected, and the second backing material injection is carried out while digging. Injecting the backing material into the tail void via the backing material injection hole of the segment located at a location away from the rear body portion by the part,
A method for injecting a backing material. The outer part is detachable with respect to the rear trunk part,
The inner part is removable with respect to the outer part,
When the shield machine proceeds from a hard ground to a soft ground, the inner part is attached to the outer part,
The outer portion is removed from the rear trunk portion and the first backing material injection portion is set as an injection position,
Connecting the backing material supply section and the first backing material injection section, and injecting the backing material from the first backing material injection section to the tail void while digging;
The backing material injecting method according to claim 1. In the storage position, the outer portion has an outer surface facing outward in the radial direction of the rear trunk portion,
In the injection position, the position of the outer surface located on the front end side of the shield machine is located at a position close to the outer peripheral surface of the rear body portion, and gradually increases toward the position located on the rear side of the shield machine. Inclined to displace radially outward of the trunk,
The method for injecting a backing material according to claim 1 or 2, wherein: A backing material supply unit disposed inside the rear trunk of a shield machine having a cutter at the tip;
An opening formed through the rear body,
An injection position that protrudes radially outward of the rear body from the opening and enables the injection of the backing material into the tail void, and a storage that is housed in the rear body from the opening and closes the opening A first backing material injecting section provided to be movable between positions and separable from the backing material supply section;
Holding means for holding the first backing material injection portion at the injection position;
A second backing material injection part connectable to and separated from the backing material supply part, which can be connected to a backing material injection hole of a segment located at a position away from the rear body part, and
In the storage position, the first backing material injecting portion enables the opening to be closed at an outer portion located on the outer side in the radial direction of the rear trunk portion, and the opening is closed in the closed state. The outer part is configured to be attachable to the rear trunk part,
The inner part which is the remaining part of the first backing material injection part excluding the outer part is configured to be removable with respect to the outer part,
Backing material injection device characterized by that. The outer portion is configured to be detachable with respect to the rear trunk portion in a state where the opening is closed in the storage position.
The inner portion is configured to be detachable from the outer portion,
The backing material injecting device according to claim 4. In the storage position, the outer portion has an outer surface facing outward in the radial direction of the rear trunk portion,
In the injection position, the position of the outer surface located on the front end side of the shield machine is located at a position close to the outer peripheral surface of the rear trunk and gradually increases toward the position located on the rear side of the shield machine. Inclined to displace radially outward of the body,
The backing material injecting device according to claim 4 or 5. The opening is formed by an inner peripheral portion of a frame-shaped packing attached over the entire inner periphery of the notch of the rear trunk portion,
The outer part is in contact with a position of the outer peripheral surface of the rear body part around the opening at the storage position, and an outer plate part formed of a cylindrical surface centering on the axis of the rear body part, An inner plate portion that protrudes from an outer plate portion and contacts an inner peripheral portion of the packing at the storage position;
The inner portion is in contact with the inner peripheral portion of the packing at the injection position, and is detachable from the inner plate portion.
The backing material injecting device according to any one of claims 4 to 6, characterized in that

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