JP4652254B2 - Shield machine and widening part construction method of shield tunnel - Google Patents

Description

  The present invention relates to a shield machine used for constructing a tunnel having a widened portion in a tunnel cross section such as a junction or branch in a road tunnel, and a method for constructing a widened portion of a shield tunnel using the shield machine.

The present applicant has proposed a technique for constructing a widened portion in a tunnel cross section using a shield machine provided with a widening cutter that can protrude from the peripheral surface of the main body (see Patent Document 1).
JP 2005-54528 A

In a shield machine, it is expensive to install a new widening cutter in addition to the cutter provided on the front side.
Therefore, it is conceivable to excavate the widening cavity using a copy cutter for excavating the curved portion provided around the front cutter of the shield machine. Here, the copy cutter is originally provided for the purpose of disturbing the natural ground for the curve construction of the shield machine and making the shield machine close to the curve, and it can be excavated greatly, It does not have the function of taking excavated soil into the chamber of the shield machine.
Therefore, for example, in the case of a muddy water type shield, if the cavity for widening is excavated with a copy cutter, it is difficult to discharge mud containing the excavated soil. It can be assumed that the soil is difficult. From the viewpoint of preventing natural collapse, it is conceivable to fill the widening cavity excavated with a copy cutter with a filler, but the cutter and the widening cavity are communicated by the excavation, and the filler Going to the cutter side will change the properties of the drilling mud and affect the original excavation soil.

  The object of the present invention is to enable the mud drainage including excavated soil and the excavated soil to be excavated while excavating the widening cavity with a copy cutter, and for the shield excavation mud and the widening cavity. It is to prevent mixing of the filler.

  In order to solve the above problems, the invention according to claim 1 is a shield machine including a cutter on the front surface of the main body and capable of projecting from the peripheral surface of the cutter, wherein the copy cutter projects. The widening cavity that is excavated in this manner is provided with a movable blocking wall that protrudes from the peripheral surface of the main body so as to be able to block the widening cavity in the forward and backward directions with respect to the digging direction of the shield machine.

Furthermore, the invention described in claim 1 is characterized in that an inlet capable of injecting high-pressure water into the entire front surface of the wall is provided inside the movable blocking wall.

The invention according to claim 2 is the shield machine according to claim 1 , characterized in that a high-pressure water inlet is provided on the peripheral surface of the main body in front of the movable blocking wall.

The invention according to claim 3 is the shield machine according to claim 1 or 2 , characterized in that a filler inlet is provided on the peripheral surface of the main body immediately after the movable blocking wall.

The invention according to claim 4 is a method for constructing a widened portion of a shield tunnel for excavating a widening cavity by projecting a copy cutter from the peripheral surface of the cutter in parallel with the excavation by the cutter on the front surface of the shield machine. Excavating the widening cavity with the copy cutter while excavating with the shield machine, with the blocking wall protruding from the peripheral surface of the machine and blocking the widening cavity with the shield machine forward and backward It is characterized by doing.

Furthermore, the invention described in claim 4 is characterized in that high-pressure water is injected into the widening cavity from the front surface of the blocking wall.

The invention according to claim 5 is the method for constructing the widened portion of the shield tunnel according to claim 4 , wherein high-pressure water is injected into the widening cavity from the peripheral surface of the shield machine in front of the blocking wall. It is characterized by doing.

The invention according to claim 6 is the method for constructing the widened portion of the shield tunnel according to claim 4 or 5 , wherein the filler is provided from the peripheral surface of the shield machine to the widening cavity immediately after the blocking wall. It is characterized by injecting.

  According to the present invention, the cavity for widening excavated by the copy cutter is excavated while being excavated in a state where it is blocked forward and backward with respect to the direction of excavation of the shield machine by the blocking wall protruding from the peripheral surface of the shield machine. Then, muddy water and excavated soil including the excavated soil in front of the barrier wall can be sent to the chamber of the shield machine, and the mud and soil can be reliably discharged. And the excavated soil excavated by the copy cutter but not taken into the chamber does not spill rearward from the barrier wall, and can eventually go around the cutter by the high-pressure water sprayed from the injection port arranged on the wall. Since it can be expected, a reliable cavity can be formed. Further, the presence of the wall can prevent the filler filled behind the wall from wrapping around the cutter, and does not affect the shield digging.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 and 2 show the configuration of an embodiment to which the present invention is applied. As shown in the figure, the shield machine has a skin plate 1, a partition wall 2, a front cutter support surface plate 3, a chamber 4 on the peripheral surface of the main body. , Cutter 5, widening copy cutter 6, cutter driving electric motor 7, copy cutter driving device 8, shield jack 9, folding jack 10, screw conveyor 11, tail seal 12, elector device 13, rear work table 14, segment A shape holding device 15, a connecting segment pushing device 16, a simultaneous backfilling injection pipe 17, a movable blocking wall 21 and the like are provided. The chamber 4 is provided with an agitator (not shown) and connected with a mud pipe and a mud pipe (not shown).

In FIG. 1, a pair of widening copy cutters 6 are provided on the rear surface of the cutter support face plate 3 so as to face each other in the diametrical direction, that is, in both directions according to the rotation direction of the cutter 5. . The widening copy cutter 6 can protrude from the peripheral surface of the cutter support face plate 3 by a copy cutter driving device 8 constituted by a hydraulic pump, an electric motor and the like.
Then, as shown in FIG. 3, the widening copy cutter 6 controls the projection amount in synchronization with the rotation of the cutter 5, so that a desired widening cavity can be formed simultaneously with the excavation of the shield machine by the rotation of the cutter 5. C can be excavated. In the figure, R indicates the rotation direction of the cutter 5.

In FIG. 2, the movable blocking wall 21 is disposed at a position spaced rearward from the partition wall 2 and can project from the opening of the skin plate 1, and is provided in advance at a desired excavation position, for example, as shown in FIG. In addition, it is provided at a vertical position closer to one side of the main body. The movable blocking wall 21 protrudes from the opening of the skin plate 1 by the blocking wall driving device 22 constituted by a pair of parallel jacks so that the widening cavity C excavated by the widening copy cutter 6 is moved forward and backward. The outer shape can be cut off.
In addition, a sliding / jet water injection pipe 23 capable of injecting high-pressure water together with the sliding material is disposed inside the movable blocking wall 21, and the sliding / jet water injection pipe 23 is movable. The front surface of the blocking wall 21 is opened obliquely outward.

  Further, in front of the movable blocking wall 21, a plurality of lubricant / jet water injection pipes 24 that can inject high-pressure water together with the lubricant are disposed in the skin plate 1, and these lubricant / jet water injection pipes 24. Is open obliquely forward from the skin plate 1. Among them, the front-side lubricant / jet water injection pipe 24 is opened immediately after the widening copy cutter 6.

  Further, immediately after the movable blocking wall 21, a filler injection pipe 25 is disposed inside the skin plate 1, and this filler injection pipe 25 has an arbitrary angle with respect to the skin plate 1. Open at a right angle.

Next, a construction procedure of a tunnel, for example, a junction part or a branch part by the above shield machine will be described.
First, the tunnel is usually dug by the front cutter 5, and the segment (not shown) is assembled by the rear erector device 13, and the tunnel is covered with a segment ring.
Then, when reaching any desired construction start time, the excavation by the front cutter 5 is continued, and the widening copy cutter 6 is protruded in synchronization with the upper and lower sides, so that the upper and lower widening hollow portions are formed in the natural ground. Drill C. That is, as shown in FIG. 3, by controlling the protrusion amount of the widening copy cutter 6 in synchronization with the rotation of the cutter 5, simultaneously with the excavation of the shield machine by the rotation of the cutter 5, The upper and lower widening cavities C are intermittently excavated and continuously formed by the widening copy cutter 6 controlled to project.

At the time of excavation of the widening cavity C by the above-described widening copy cutter 6, the lubricating material / jet water is injected into the widening cavity C from the sliding material / jet water injection pipe 24 opened in the skin plate 1.
Thereafter, when the movable blocking wall 21 reaches the widening cavity C due to the excavation of the shield machine, the upper and lower movable blocking walls 21 are protruded from the skin plate 1 in synchronization with each other, so that the upper and lower widening cavity C Are blocked forward and backward by the respective movable blocking walls 21. At the same time, the lubricant / jet water is injected into the widening cavity C from the lubricant / jet water injection pipe 23 opened in front of the movable blocking wall 21.
As a result, in the widening cavity C, the muddy water including the excavated soil in front that is blocked by the movable blocking wall 21 is easily fed into the chamber 4 and is discharged through the screw conveyor 11 in the shield machine as is well known. The

  Further, immediately after the movable blocking wall 21, the filler is injected into the widening cavity C from the filler injection tube 25 that opens to the skin plate 1. As a result, the rear widening cavity C blocked by the movable blocking wall 21 is filled with the filler.

  Then, in the section corresponding to the upper and lower partial widened portion excavation work by the widening copy cutter 21, for example, a steel segment (not shown) is covered up and down by the erector device 13. The steel segment incorporates a connecting segment (not shown) so as to be slidable in the vertical direction.

Subsequently, at the time when the rear work table 14 is released from the shield tail (seal) 11 as it travels (is left on the ground), the hydraulic jacks of the upper and lower connecting segment pushing devices 16 are immediately released. By extension operation, the connecting segment is pushed into the excavation part widening portion from the upper and lower steel segments, for example.
The above-described excavation and lining accompanied with the partial widened portion excavation are continuously performed until the design length of the predetermined section is reached.

  And when reaching the design length of the merging part / diverging part, the upper and lower widening copy cutters 21 are respectively stored in the skin plate 1 to perform normal excavation and, for example, a normal one not using a steel segment Assemble only the segments and cover the tunnel with segment rings.

As shown in FIG. 4, the above-described excavation and lining with partial widening excavation are performed by arranging a lamp tunnel next to the main tunnel using a shield machine having the same configuration and different sizes, for example.
Thus, in the widened section where the lining has been completed, the chemical solution is injected into the upper and lower grounds between the main tunnel and the lamp tunnel from the inside of the lining tunnel.
Next, in the upper and lower chemical solution injection work, an arch-shaped support by long steel pipe fore-pyring is constructed between the connecting segments of the main tunnel and the lamp tunnel.
And, between the main line tunnel and the ramp tunnel, excavated ground between the upper and lower support works.

Next, a steel shell is installed over the connecting segment of the main tunnel and the lamp tunnel, and a concrete placement work is performed in the steel shell.
Thereafter, the adjacent segments of the main tunnel and the lamp tunnel segment ring are removed, and the main tunnel and the lamp tunnel are laterally continued as shown in the figure.
This completes the construction of the junction and diversion part of the shield tunnel.

In the above embodiment, the main tunnel and the ramp tunnel are constructed as, for example, a confluence section / a diversion section. However, the present invention is not limited to this, and any desired widening such as an emergency parking zone. It may be the construction of the part.
In the embodiment, the muddy water type shield is used. However, an earth pressure type shield may be used, and it is needless to say that a specific detailed structure of the shield machine can be appropriately changed. For example, a movable blocking wall may be provided immediately after the partition wall.

BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which shows the structure of one Embodiment to which this invention is applied, and showed the front cutter and the copy cutter of a shield machine. It is a vertical side view of the shield machine of FIG. It is operation | movement explanatory drawing which shows excavation of the cavity part for widening by a copy cutter. It is a schematic perspective view which shows excavation of the cavity for widening by the copy cutter performed using two shield machines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body surrounding surface 5 Cutter 6 Widening copy cutter 21 Movable blocking wall 22 Shutting wall driving device 23 Lubricant / high pressure water injection pipe 24 Lubricant / high pressure water injection pipe 25 Filler injection pipe

Claims (6)

A shield machine with a cutter on the front of the main body and a copy cutter that can protrude from the peripheral surface of the cutter,
For the widening cavity portion that is excavated by projecting the copy cutter, a movable blocking wall that protrudes from the peripheral surface of the main body and that can block the widening cavity portion back and forth with respect to the digging direction of the shield machine ,
The shield machine according to claim 1 , further comprising an inlet capable of injecting high-pressure water into the entire front surface of the movable blocking wall . The shield machine according to claim 1 , further comprising a high-pressure water inlet on a peripheral surface of the main body in front of the movable blocking wall. Shield machine according to claim 1 or 2, characterized in that it comprises a filler injection port main body circumferential surface immediately after the movable barrier walls. A method for constructing a widened portion of a shield tunnel in which a copy cutter is projected from a cutter peripheral surface in parallel with excavation by a cutter on the front surface of a shield machine, and a widening cavity is excavated,
With the blocking wall protruding from the peripheral surface of the shield machine and blocking the widening cavity portion back and forth with respect to the digging direction of the shield machine, the widening cavity portion is formed by the copy cutter while digging with the shield machine. While drilling ,
A method for constructing a widened portion of a shield tunnel, wherein high-pressure water is injected from the front surface of the blocking wall into the widening cavity . 5. The method for constructing a widened portion of a shield tunnel according to claim 4 , wherein high-pressure water is injected into the widening cavity from the peripheral surface of the shield machine in front of the blocking wall. 6. The method for constructing a widened portion of a shield tunnel according to claim 4 or 5 , wherein a filler is injected into the widening cavity from the peripheral surface of the main body of the shield machine immediately after the blocking wall.

Images