JP7101543B2 - Shield excavator and tunnel construction method - Google Patents

Description

The present invention relates to a shield excavator and a tunnel construction method using the shield excavator.

In tunnels for automobiles and railways, a plurality of branch tunnels branching from the main tunnel may be constructed in a non-penetrating state, and the plurality of non-penetrating tunnels may be used as an emergency parking zone, an evacuation zone, and an equipment storage area. The non-penetrating tunnel is constructed by, for example, the NATM method.

In the NATM method, a tunnel is constructed in the axial direction by repeating the rupture process, the slip-out process, the primary concrete spraying process, the support construction building process, and the secondary concrete spraying process at predetermined distances (for example, 1 to 3 m). go. Until the primary concrete spraying process is completed, the ground is exposed and there is a risk that groundwater will flow into the tunnel. , Auxiliary construction methods such as the groundwater lowering construction method that lowers the groundwater level will be carried out.

Since the groundwater lowering method lowers the groundwater level by draining the groundwater from the ground, there is a risk that the ground surface will subside when adopted in urban areas. In addition, it is difficult to judge whether the flow of groundwater has stopped by the chemical injection method. Therefore, there is a concern that sudden spring water may occur during excavation, leading to the collapse of the tunnel, which may lead to an increase in countermeasure construction costs and an extension of the construction period.

As a method of constructing a tunnel in an urban area without using an auxiliary method such as a chemical injection method or a groundwater lowering method, a method using a shield excavator is known, and Patent Document 1 constructs a non-penetrating tunnel. A shield digger for this is disclosed. This shield excavator is equipped with a cylindrical outer body that supports the inner wall surface of the ground behind the face, a partition wall provided inside the front end of the outer body, and a cutter head formed so as to be able to pass through the opening of the partition wall. There is. When the excavation of one non-penetrating tunnel is completed, the cutter head passes through the opening of the bulkhead and is pulled out from the outer barrel behind the tunnel and reused when excavating another non-penetrating tunnel. The opening of the bulkhead is shielded by the gate after passing through the cutter head.

Japanese Unexamined Patent Publication No. 2016-199912

In the shield excavator disclosed in Patent Document 1, a space is formed between the face and the partition wall after the cutter head is pulled out from the outer body. Therefore, there is a concern that the face will collapse in this space and the surrounding ground will be deformed. For this reason, it is required to construct a non-penetrating tunnel with a shield excavator without collapsing the face to improve the safety of tunnel construction.

An object of the present invention is to enhance the safety of tunnel construction.

The present invention is a shield excavator, which has an outer body portion having an opening inside, an excavation part formed so as to be accommodated in the outer body portion through the opening, and excavating a face, and a shield excavating part that shields the opening and is inside the outer body portion. A state in which the excavated part is housed in the outer body through the opening from the face, including a shielding part that covers the housed excavated part from the face side and a concrete material supply part that supplies concrete material between the openings and the face. The shielding portion shields the opening and covers the excavated portion from the face side , and the concrete material supply portion supplies the concrete material between the opening and the face in a state where the shielding portion shields the opening.
Further, the present invention is a shield excavator, which has an outer body portion having an opening inside, an excavation portion formed so as to be accommodated in the outer body portion through the opening, and a shielding portion for excavating a face, and a shielding portion for shielding the opening. , A concrete material supply section that supplies concrete material between the opening and the face, a filler supply section that supplies the filler between the opening and the face, and a mud discharge section that discharges the mud between the opening and the face. The concrete material supply part has an opening and a face, and the shielding part shields the opening while the excavated part is housed in the outer body through the opening from the face, and the concrete material supply part shields the opening. A concrete material is supplied between the openings, and the filler supply unit supplies the filler between the opening and the face with the opening open, and the mud discharge unit discharges the mud between the opening and the face.

Further, the present invention is a shield excavator, which includes an outer body portion having an opening inside, an excavation portion formed so as to be accommodated in the outer body portion through the opening, and a shield portion for excavating a face, and a shielding portion for shielding the opening. A filler supply unit that supplies a filler between the opening and the face and a mud discharge unit that discharges the mud between the opening and the face are provided, and the filler supply unit is provided with the opening open. A filler is supplied between the opening and the face, the mud discharge part discharges the mud between the opening and the face, and the shield part opens the opening while the excavated part is housed in the outer body through the opening from the face. Shield.

Further, the present invention shields the outer body portion having an opening, the excavation part formed so as to be accommodated in the outer body portion through the opening, and the excavation part accommodated in the outer body portion from the face side. It is a tunnel construction method using a shield excavator equipped with a part, a digging process in which a face is excavated using an excavation part to dig a shield excavator, and the excavation part is housed in the outer body through an opening from the face. It is provided with a storage step of shielding the opening by using a shielding portion and a shielding step of covering the excavated portion from the face side , and a concrete material supply step of supplying a concrete material between the opening and the face.

Further, the present invention is a tunnel construction method using an excavation portion that is attached to the outer body portion so as to be able to advance and retreat to excavate a face, and the excavation portion is attached to the first outer body portion and the first outer body portion. The first excavation process of advancing to the face side from the opening provided inside and excavating the first branch tunnel, and the accommodating process of accommodating the excavated part from the face through the opening of the first outer body part in the first outer body part. , A shielding process that shields the opening of the first outer body, a concrete material supply process that supplies concrete material between the opening and the face, and a removal of the excavated part from the first outer body to the second outer body. It is provided with a second excavation step of advancing to the face side from an opening provided inside the second outer body portion and excavating a second branch tunnel.
Further, the present invention is a tunnel construction method using a shield excavator including an outer body portion having an opening, an excavation portion formed so as to be accommodated in the outer body portion through the opening, and a shielding portion for shielding the opening. There is a digging process in which the face is excavated using the excavation part to dig a shield excavator, a storage process in which the excavated part is housed in the outer body through the opening from the face, and a shield that shields the opening using the shielding part. It is equipped with a process and a concrete material supply process for supplying concrete material between the opening and the face, and in the accommodating process, a filler is supplied between the opening and the face and mud between the opening and the face is removed. Discharge.

According to the present invention, the safety of tunnel construction can be enhanced.

It is sectional drawing seen from the vertical upper side of the tunnel constructed by the shield excavator which concerns on embodiment of this invention, and shows the state which the 1st branch tunnel is constructed. It is sectional drawing seen from the vertical upper side of the tunnel constructed by the shield excavator which concerns on embodiment of this invention, and shows the state which the 2nd branch tunnel is constructed. It is sectional drawing of the shield excavator which concerns on embodiment of this invention, and shows the state of excavating a branch tunnel. The state where the chamber is filled with the filler is shown. The state where the cutter is housed in the outer body is shown. The state where the opening is shielded by the shutter is shown. It shows the state where the concrete material is supplied between the face and the opening. The state where the cutter is pulled out from the outer body is shown. The state where the lining concrete is placed on the inner peripheral surface of the outer body is shown.

Hereinafter, a tunnel construction method for constructing a tunnel using the shield excavator 100 and the shield excavator 100 according to the embodiment of the present invention will be described with reference to the drawings. Here, the shield excavator 100 for constructing a tunnel for automobiles and railways and the tunnel construction direction will be described.

In the tunnel T for automobiles and railways, as shown in FIG. 2, a branch tunnel Tb branching from the main tunnel Ta as an underground cavity may be constructed in a non-penetrating state. A plurality of such non-penetrating branch tunnels Tb are constructed at predetermined intervals in, for example, the main tunnel Ta, and are used as an emergency parking zone, an evacuation zone, and an equipment storage area. The shield excavator 100 is used for constructing the branch tunnel Tb.

First, the procedure for constructing the branch tunnel Tb will be briefly described with reference to FIGS. 1 and 2. Here, a case where the first and second branch tunnels Tb1 and Tb2 as the branch tunnel Tb are constructed in this order will be described. FIG. 1 shows a state in which the first branch tunnel Tb1 is constructed, and FIG. 2 shows a state in which the construction of the first branch tunnel Tb1 is completed and the second branch tunnel Tb2 is constructed.

As shown in FIGS. 1 and 2, the shield excavator 100 is provided between the outer body portion 10 that supports the inner wall surface of the ground behind the face S and the outer body portion 10 and the face S to excavate the face S. It is provided with a cutter 20 as an excavation part. As shown in FIG. 1, when the shield excavator 100 excavates the first branch tunnel Tb1, the cutter 20 is attached to the outer body portion 10, and the outer body portion 10 and the cutter 20 move forward as one. do. The segment ring 90 is assembled as the outer body portion 10 advances.

When the first branch tunnel Tb1 is dug for a desired length (for example, 20 m), the excavation of the first branch tunnel Tb1 is completed. Next, the cutter 20 is removed from the outer body portion 10, and the cutter 20 is pulled out from the outer body portion 10 using a device (not shown) or a heavy machine. By placing lining concrete on the inner peripheral surface of the outer body portion 10 and the inner peripheral surface of the segment ring 90 with the outer body portion 10 left in the first branch tunnel Tb1 (FIG. 2), the first branch is formed. Construction of tunnel Tb1 is completed.

The construction of the first branch tunnel Tb1 may be completed without placing lining concrete on the inner peripheral surface of the segment ring 90. That is, the lining concrete may be cast only on the inner peripheral surface of the outer body portion 10 to expose the inner peripheral surface of the segment ring 90.

When digging the second branch tunnel Tb2, the cutter 20 used for digging the first branch tunnel Tb1 is attached to the outer body portion 10 prepared separately. After that, the second branch tunnel Tb2 is constructed by the same procedure as the procedure for constructing the first branch tunnel Tb1.

According to the above procedure, one cutter 20 can excavate the first and second branch tunnels Tb1 and Tb2. Therefore, the construction cost of the tunnel T can be reduced.

By the way, the face S may collapse, and it is dangerous if the face S is exposed. When the cutter 20 is attached to the outer body 10, it is safe because the face S is covered by the shield excavator 100, but when placing the lining concrete, the cutter 20 is used for the outer body. Since it is pulled out from 10, the face S cannot be covered by the shield excavator 100. Therefore, in order to enhance the safety of tunnel construction, it is desirable to stabilize the face S before pulling out the cutter 20 from the outer body portion 10.

The shield excavator 100 and the tunnel construction method according to the present embodiment are configured to cast a concrete material on the face S with the cutter 20 attached to the outer body portion 10. Therefore, the face S is stable even when the cutter 20 is pulled out from the outer body portion 10. Therefore, it is possible to prevent the face S from collapsing and enhance the safety of tunnel construction.

Hereinafter, the configuration of the shield excavator 100 and the tunnel construction method will be specifically described with reference to FIGS. 3 to 9.

As shown in FIG. 3, the outer body portion 10 of the shield excavator 100 has a cylindrical skin plate 11 and a partition wall 12 protruding from the inner peripheral surface of the skin plate 11. The partition wall 12 is formed in an annular shape, and the partition wall 12 forms an opening 13 inside the outer body portion 10. The opening 13 is formed in a substantially rectangular shape in which two sides extend in the horizontal direction and the other two sides extend in the vertical direction.

Inside the skin plate 11, a drive unit 30 for rotationally driving the cutter 20 is provided. The drive unit 30 includes a support drum 32 that rotatably supports the cutter 20 via a rotary shaft 31, and a motor 33 fixed to the support drum 32. The motor 33 is connected to the rotary shaft 31 via the reduction mechanism 34, and the rotation of the motor 33 is transmitted to the rotary shaft 31 via the reduction mechanism 34.

The cutter 20 has a cutter spoke 21 extending radially from the rotary shaft 31 and an overcutter 22 provided so as to project radially from the tip of the cutter spoke 21. A bit (not shown) is attached to the cutter spoke 21 and the overcutter 22, and the face S is excavated by the rotation of the cutter 20.

The support drum 32 of the drive unit 30 is supported by the skin plate 11 so as to be movable in the axial direction via the guide member 40. The guide member 40 can guide the support drum 32 to an excavation position that enables excavation of the face S by the cutter 20 and an accommodation position (see FIG. 5) that accommodates the cutter 20 in the skin plate 11.

When excavating the face S, the support drum 32 is held at the excavation position as shown in FIG. At this time, the support drum 32 closes the opening 13 of the outer body portion 10 and forms the chamber C together with the partition wall 12 with the face S. The mud generated by the excavation of the face S is taken into the chamber C and temporarily stored. The mud stored in the chamber C is discharged from the discharge port 32a formed in the support drum 32 by using the screw conveyor 50 as the mud discharge portion.

The discharge port 32a is formed vertically below the rotary shaft 31. Therefore, the mud accumulated in the chamber C can be easily discharged by using the screw conveyor 50.

Further, when excavating the face S, the overcutter 22 protrudes from the cutter spokes 21. In this state, the length of the cutter 20 is substantially equal to the outer diameter of the skin plate 11. Therefore, the branch tunnel Tb can be dug with an inner diameter substantially equal to the outer diameter of the skin plate 11.

When moving the support drum 32 from the excavation position to the accommodation position, the overcutter 22 is pulled into the cutter spokes 21 as shown in FIG. In this state, the length of the cutter 20 is smaller than the inner diameter of the opening 13 of the outer body portion 10 (specifically, the diagonal length of the substantially rectangular opening 13), and the cutter 20 can pass through the opening 13. be. Therefore, when the support drum 32 moves from the excavation position to the accommodation position, the cutter 20 is accommodated in the outer body portion 10 from the face S through the opening 13.

The shield excavator 100 further includes a shutter 60 as a shielding portion that shields the opening 13 of the outer body portion 10. The shutter 60 is housed in a housing portion 61 provided between the skin plate 11 and the guide member 40 in a state where the opening 13 is not shielded. When the shutter 60 is pulled out from the accommodating portion 61 through the shutter gate 62 fixed to the partition wall 12, the shutter guide groove 63 fixed to the partition wall 12 along the peripheral edge of the opening 13 guides the shutter 60 to shield the opening 13. To.

The shutter gate 62 and the shutter guide groove 63 are opened and closed by the guide member 40. Specifically, the guide member 40 has a first guide cylinder 41 removably mounted on the inner circumference of the skin plate 11 and a second guide cylinder 42 slidably provided on the inner circumference of the first guide cylinder 41. The shutter gate 62 and the shutter guide groove 63 are opened and closed by the second guide cylinder 42.

The inner circumference of the first guide cylinder 41 is formed to have substantially the same shape as the opening 13 of the partition wall 12, and defines a space extending axially from the opening 13. The shutter gate 62 and the shutter guide groove 63 are provided between the end portion of the first guide cylinder 41 and the partition wall 12.

The outer circumference of the second guide cylinder 42 is formed to have substantially the same shape as the inner circumference of the first guide cylinder 41, that is, to have substantially the same shape as the opening 13 of the partition wall 12. Therefore, as shown in FIG. 3, the second guide cylinder 42 can enter the opening 13 across the shutter gate 62 and the shutter guide groove 63, and by entering the opening 13, the shutter gate 62 and the shutter guide groove 63 can enter. Block 63. As shown in FIG. 6, the shutter gate 62 and the shutter guide groove 63 are opened by moving the entire second guide cylinder 42 into the first guide cylinder 41. This makes it possible for the shutter 60 to shield the opening 13. The shutter 60 is substantially rectangular when unfolded and viewed in a plan view. Therefore, the opening 13 formed in a substantially rectangular shape can be suitably shielded. Further, the opening 13 does not have to be rectangular as long as it can be shielded by the shutter 60, and may be circular or the like.

The outer circumference of the support drum 32 of the drive unit 30 is formed to have substantially the same shape as the inner circumference of the second guide cylinder 42, and slides on the inner circumference of the second guide cylinder 42. Therefore, when the support drum 32 is moved to the accommodation position, the chamber C is defined by the partition wall 12, the second guide cylinder 42, and the support drum 32, as shown in FIG. Then, as shown in FIG. 6, when the shutter 60 shields the opening 13, the chamber C is located between the first chamber C1 located between the face S and the shutter 60, and between the support drum 32 and the shutter 60. It is partitioned into a second chamber C2 located in.

The shield excavator 100 includes a filler pump 70 as a filler supply unit that supplies a filler between the face S and the opening 13, and a concrete material supply unit that supplies concrete material between the face S and the opening 13. The concrete pump 80 and the like are provided.

The filler pump 70 is connected to the filler hole 72 formed vertically above the opening 13 in the partition wall 12 through the filler conduit 71. The filler is supplied from the filler hole 72 between the face S and the opening 13 by the filler pump 70. The filler is preferably a plastic filler. The plastic filler is a fluid material having a high viscosity (for example, 300 dPa · s or more), and for example, a plastic filler mixed with a water glass solution containing bentonite as a main component can be used. It is also possible to use a viscous solution such as an aqueous solution of a polymer flocculant or an aqueous solution of bentonite as the filler.

The concrete pump 80 is connected to the concrete hole 82 formed vertically below the opening 13 in the partition wall 12 through the concrete conduit 81. The concrete material is supplied from the concrete hole 82 between the face S and the opening 13 by the concrete pump 80. The concrete material is, for example, underwater inseparable concrete or high-fluidity concrete, and the concrete material includes mortar and the like.

Next, a method of constructing the branch tunnel Tb using the shield excavator 100 will be described with reference to FIGS. 3 to 9.

First, as shown in FIG. 3, the guide member 40 is attached to the skin plate 11, and the cutter 20 is attached to the outer body portion 10 via the drive portion 30 and the guide member 40. Next, the face S is excavated using the cutter 20, and the shield excavator 100 is excavated. At this time, the support drum 32 is held at the excavation position to form the chamber C. The mud generated by excavating the face S is stored in the chamber C and discharged from the chamber C by the screw conveyor 50.

The excavation of the branch tunnel Tb is carried out by the so-called propulsion method. Details of the propulsion method will be omitted. The shield excavator 100 of the present embodiment may be used in the so-called shield method, and the branch tunnel Tb may be excavated by the shield method. Here, in the shield method, the segment ring 90 is assembled in the shield excavator 100, and the shield excavator 100 is advanced by obtaining a reaction force from the segment ring 90 by the hydraulic jack (not shown) in the shield excavator 100. In the propulsion method, the segment ring 90 is assembled in the main tunnel Ta (see FIG. 1 or 2), and the shield excavator 100 is advanced by pushing the segment ring 90 with a hydraulic jack (not shown) installed in the main tunnel Ta. Let me.

When the branch tunnel Tb is dug for a desired length (for example, 20 m), the excavation of the face S by the cutter 20 is stopped. Then, as shown in FIG. 4, the filler pump 70 is used to supply the filler to the chamber C, and the mud in the chamber C is discharged using the screw conveyor 50. As a result, the mud in the chamber C is replaced with the filler. Therefore, it is possible to prevent the pressure in the chamber C from dropping, and the face S can be stabilized.

The filler filled in the chamber C preferably has a lower specific density than that of mud. This allows the filler to collect above the mud and collect the mud below. Since the discharge port 32a is formed vertically below the rotary shaft 31, the mud collected downward by the supply of the filler can be discharged using the screw conveyor 50.

Next, as shown in FIG. 5, the support drum 32 is moved with respect to the second guide cylinder 42, and the cutter 20 is housed in the outer body portion 10 from the face S through the opening 13 of the outer body portion 10. At this time, the overcutter 22 is pulled into the cutter spokes 21. As a result, the length of the cutter 20 becomes smaller than the inner diameter of the opening 13 of the outer body portion 10. Therefore, the cutter 20 can be easily accommodated in the outer body portion 10.

While the support drum 32 moves and the chamber C expands, the filler supply continues. As a result, it is possible to prevent the pressure acting on the face S from decreasing, and the face S can be stabilized.

Further, when accommodating the cutter 20, the shutter gate 62 and the shutter guide groove 63 are closed by the second guide cylinder 42. Therefore, it is possible to prevent the filler from leaking through the shutter gate 62 and the shutter guide groove 63.

Next, as shown in FIG. 6, the second guide cylinder 42 is moved with respect to the first guide cylinder 41 to open the shutter gate 62 and the shutter guide groove 63. Next, the shutter 60 is used to shield the opening 13. As a result, the chamber C is divided into the first chamber C1 and the second chamber C2.

Next, as shown in FIG. 7, the concrete material is supplied from the concrete hole 82 to the first chamber C1 by using the concrete pump 80, and the filler in the first chamber C1 is discharged through the filler hole 72. As a result, the filler in the first chamber C1 is replaced with the concrete material. Therefore, it is possible to prevent the pressure in the first chamber C1 from dropping, and the face S can be stabilized.

The filler preferably has a lower specific density than the concrete material. As a result, the supplied concrete material accumulates below the filler, and the filler can be collected above. Since the filler hole 72 is formed above the opening 13 in the partition wall 12, the filler collected upward by the supply of the concrete material can be discharged from the filler hole 72. Therefore, the filler of the first chamber C1 can be easily replaced with the concrete material.

When supplying the concrete material, the second chamber C2 is filled with a filler. Therefore, the shutter 60 not only receives pressure from the concrete material in the first chamber C1, but also receives pressure from the filler in the second chamber C2. Therefore, the shutter 60 can be supported by the filler in the second chamber C2, and the deformation of the shutter 60 can be prevented without increasing the strength of the shutter 60. As a result, an inexpensive member having low strength can be used for the shutter 60, and the manufacturing cost of the shield excavator 100 can be reduced.

When the concrete material has hardened, the filler in the second chamber C2 is discharged using the screw conveyor 50. After that, the first guide cylinder 41 is removed from the skin plate 11, and the guide member 40, the drive unit 30, and the cutter 20 are pulled out from the outer body portion 10 and collected by using a device (not shown) or a heavy machine, as shown in FIG. .. At this time, the face S is hardened by the concrete material and is stable. Therefore, it is possible to prevent the face S from collapsing even when the cutter 20 is pulled out from the outer body portion 10.

When the guide member 40, the drive unit 30, and the cutter 20 are pulled out from the outer body portion 10, the filler conduit 71 and the concrete conduit 81 may be removed from the partition wall 12.

Next, as shown in FIG. 9, lining concrete is placed on the inner peripheral surface of the skin plate 11, the inner peripheral surface of the segment ring 90, and the shutter 60. At this time, since the face S is already hardened and stable by the concrete material, it is possible to prevent the face S from collapsing. Therefore, the lining concrete can be safely placed. The lining concrete is placed using a formwork (not shown).

This completes the construction of the branch tunnel Tb.

When constructing another branch tunnel Tb, a new outer body portion 10 is prepared, a guide member 40 is attached to the skin plate 11 of the new outer body portion 10, a cutter 20 is used as a drive unit 30, and a guide member 40 is attached. It is attached to the outer body portion 10 via. Hereinafter, another branch tunnel Tb can be constructed by the same procedure.

The guide member 40, the drive unit 30, and the cutter 20 attached to the new outer body portion 10 are used and recovered for excavation of the constructed branch tunnel Tb. Therefore, a plurality of branch tunnels Tb can be dug using one cutter 20, the drive unit 30, and the guide member 40. Therefore, the construction cost of the tunnel T can be reduced.

As a result, the construction of the plurality of branch tunnels Tb is completed.

According to the above embodiment, the following actions and effects are exhibited.

In the shield excavator 100 and the tunnel construction method, the opening 13 is shielded while the cutter 20 is housed in the outer body portion 10 from the face S through the opening 13, and the opening 13 and the face S are shielded. Concrete material is supplied during. Therefore, the face S is hardened by the concrete material with the cutter 20 attached to the outer body portion 10, and the face S is stabilized. Therefore, even when the cutter 20 is pulled out from the outer body portion 10, the face S can be prevented from collapsing, and the safety of tunnel construction can be enhanced.

Further, with the opening 13 open, a filler is supplied between the opening 13 and the face S, and mud between the opening 13 and the face S is discharged. Therefore, the mud between the opening 13 and the face S is replaced with the filler. Therefore, the pressure acting on the face S can be maintained, and the face S can be stabilized.

Further, the cutter 20 is removed from the outer body portion 10 and attached to another outer body portion 10, and another branch tunnel Tb is dug. Therefore, the cutter 20 can be diverted to construct a plurality of branch tunnels Tb, and the construction cost of the tunnel T can be reduced.

Although the embodiments of the present invention have been described above, the above-described embodiments show only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above-described embodiments. do not have.

In the shield excavator 100, the mud between the face S and the opening 13 is replaced with a filler, and then the filler between the face S and the opening 13 is replaced with a concrete material. Not limited to this form, a concrete material may be supplied without supplying a filler between the face S and the opening 13.

Further, instead of the concrete material, the cutter 20 may be pulled out from the outer body portion 10 in a state where the filler is supplied between the face S and the opening 13. In this case, the face S is supported by the pressure of the filler, and the face S is stabilized. Therefore, even when the cutter 20 is pulled out from the outer body portion 10, the face S can be prevented from collapsing, and the safety of tunnel construction can be enhanced.

Further, in the shield excavator 100, the filler pump 70 is connected to the filler hole 72 of the partition wall 12 through the filler conduit 71 even when excavating the branch tunnel Tb. It may be connected to the filler hole 72 of the partition wall 12 at the time of supply. Similarly, the concrete pump 80 may be connected to the concrete hole 82 of the partition wall 12 when supplying the concrete material.

Further, in the shield excavator 100, the filler is supplied and discharged through the filler conduit 71, but a conduit for supplying the filler and a conduit for discharging the filler may be provided separately.

Further, the guide member 40 does not have to be pulled out from the outer body portion 10 together with the cutter 20 and the drive portion 30. That is, when the cutter 20 is pulled out from the outer body portion 10 and collected, the guide member 40 may be left in the outer body portion 10.

100 ... Shield excavator 10 ... Outer body 13 ... Opening 20 ... Cutter (excavation)
50 ... Screw conveyor (mud discharge part)
60 ... Shutter (shielding part)
70 ... Filler pump (filler supply unit)
80 ... Concrete pump (concrete material supply section)
T ... Tunnel Ta ... Main line tunnel (underground cavity)
Tb ... Branch tunnel Tb1 ... 1st branch tunnel Tb2 ... 2nd branch tunnel S ... Face

Claims (8)

It ’s a shield digger,
An outer body with an opening inside,
An excavation section that is formed so as to be accommodated in the outer body portion through the opening and excavates the face.
A shielding portion that shields the opening and covers the excavated portion housed in the outer body portion from the face side.
A concrete material supply unit for supplying concrete material between the opening and the face is provided.
A state in which the excavated portion is housed in the outer body portion from the face through the opening, the shielding portion shields the opening, the excavated portion is covered from the face side, and the shielding portion shields the opening. A shield excavator in which the concrete material supply unit supplies concrete material between the opening and the face. It ’s a shield digger,
An outer body with an opening inside,
An excavation section that is formed so as to be accommodated in the outer body portion through the opening and excavates the face.
A shielding portion that shields the opening and
A concrete material supply unit that supplies concrete material between the opening and the face,
A filler supply unit that supplies a filler between the opening and the face,
A mud discharge section for discharging mud between the opening and the face is provided.
The shield portion shields the opening in a state where the excavated portion is housed in the outer body portion through the opening from the face, and the concrete material supply portion serves as the opening in a state where the shielding portion shields the opening. Supply concrete material between the face and
With the opening open, the filler supply unit supplies the filler between the opening and the face, and the mud discharge unit discharges the mud between the opening and the face.
Shield digger. It ’s a shield digger,
An outer body with an opening inside,
An excavation section that is formed so as to be accommodated in the outer body portion through the opening and excavates the face.
A shielding portion that shields the opening and
A filler supply unit that supplies a filler between the opening and the face,
A mud discharge section for discharging mud between the opening and the face is provided.
With the opening open, the filler supply unit supplies the filler between the opening and the face, and the mud discharge unit discharges the mud between the opening and the face, and the excavation. A shield excavator in which the shielding portion shields the opening while the portion is housed in the outer body portion from the face through the opening. An outer body portion having an opening, an excavation portion formed so as to be accommodated in the outer body portion through the opening, and a shielding portion that shields the opening and covers the excavation portion accommodated in the outer body portion from the face side. It is a tunnel construction method using a shield excavator equipped with a part.
The excavation process of excavating the face using the excavation part to excavate the shield excavator, and
The accommodating step of accommodating the excavated portion from the face through the opening into the outer body portion.
A shielding step of shielding the opening by using the shielding portion and covering the excavated portion from the face side.
A concrete material supply process for supplying a concrete material between the opening and the face,
How to build a tunnel. It is a tunnel construction method using an excavation part that is movably attached to the outer body part and excavates the face.
With the first excavation step of mounting the excavation portion on the first outer body portion and moving the excavation portion from the opening provided inside the first outer body portion to the face side to excavate the first branch tunnel. ,
The accommodating step of accommodating the excavated portion from the face through the opening into the first outer body portion.
A shielding step of shielding the opening of the first outer body portion, and
A concrete material supply step of supplying a concrete material between the opening of the first outer body portion and the face.
The excavated portion is removed from the first outer body portion and attached to the second outer body portion, and at the same time, the excavated portion is moved to the face side from the opening provided inside the second outer body portion to excavate the second branch tunnel. 2 excavation process and
How to build a tunnel. The tunnel construction method according to claim 4 or 5, wherein in the accommodating step, a filler is supplied between the opening and the face and mud is discharged between the opening and the face. The first branch tunnel and the second branch tunnel are formed from the inner wall surface of one underground cavity.
The tunnel construction method according to claim 5. A tunnel construction method using a shield excavator including an outer body portion having an opening, an excavation portion formed so as to be accommodated in the outer body portion through the opening, and a shielding portion that shields the opening.
The excavation process of excavating the face using the excavation part to excavate the shield excavator, and
The accommodating step of accommodating the excavated portion from the face through the opening into the outer body portion.
A shielding step of shielding the opening using the shielding portion,
A concrete material supply process for supplying concrete material between the opening and the face is provided.
In the accommodating step, a filler is supplied between the opening and the face, and mud between the opening and the face is discharged.
How to build a tunnel.

Images