JP2007046294A - Tunnel widening construction method and tunnel widening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a widening machine in a simple structure, to improve construction work efficiency for widening, to shorten a construction period, to reduce construction cost, to enable widening of a large cross section, to enhance the degree of freedom and stability of a skeleton structure, and to form a segment in a lightweight structure. <P>SOLUTION: This tunnel widening construction method pulls back a front body in a main body part of a shield machine while filling a natural ground stabilizing filler in its excavation place by overhanging the front body from the inside of the main body part 2 of the shield machine 1 by excavating the natural ground by its cutters, by constituting the widening machine 3 of the excavating front body 3A having the cutters 4 and 5 and a pre-lining rear body 3B; and afterwards, constructs a pre-lining 7 by a segment or concrete there from the rear body by excavating in a cross-sectional shape of the widening machine by advancing boring by the widening machine combined with the front body and the rear body simultaneously with boring advancing of the shield machine by pushing out to a stabilizing area by the filler from the inside of the main body part of the shield machine by combining the front body and the rear body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tunnel widening method and a tunnel widening device for constructing a partial widened portion such as an emergency parking zone in a shield tunneling method.

  As conventional techniques, Patent Document 1 (Japanese Patent Laid-Open No. 2005-60989), Patent Document 2 (Japanese Patent Laid-Open No. 2004-316407), Patent Document 3 (Japanese Patent Laid-Open No. 2004-270226), and Patent Document 4 (Japanese Patent Laid-Open No. 2002-2002). The following technologies are disclosed in each of Japanese Patent No. -70484).

<Patent Document 1>
A side wall cutter head is disposed on a side portion of the skin plate of the shield machine, and the side wall cutter head is disposed so as to be able to reciprocate in a direction substantially perpendicular to the direction of the shield machine. The side wall cutter head is usually housed in the skin plate, and when the side wall cutter head reaches the widening start position, the shield excavator stops digging and the side wall cutter head protrudes from the skin plate to make a hole in the side wall portion. Excavate. After the hole excavation is completed, the shield excavator is advanced a predetermined amount to stop the excavation, and the hole is excavated again at the same position. By repeating this, the widening groove is excavated.

<Patent Document 2>
A main shield having a main segment assembling device for assembling a normal segment for a main tunnel, and a widening shield having a widening member assembling device for assembling a widening segment that is a crescent-shaped cylindrical body, Reciprocating in the radial direction with respect to the main shield so that it can move between the non-operating position located radially inside the main shield and the working position partially located radially outside the main shield Is provided. A widening cutter is attached to the front surface of the widening shield, and the widening portion is excavated by the widening cutter in a state where the widening shield protrudes radially outward of the main shield.
Patent Document 2 also discloses an example in which the widening cutter can be swung with respect to the main shield with a spherical rocking body.

<Patent Document 3>
A blade is attached to the outer shell of the shield excavator so that the opening can be opened and closed by hinge coupling, and soil removal means is provided on the outer surface of the blade to soften the surrounding soil before widening. The excavated soil is discharged by the soil discharging means on the outer surface of the vane portion while excavating the widened portion with a swinging cutter with the vane portion opened.

<Patent Document 4>
The shield main body of the shield excavator includes a fixed cylinder having a main cutter head on the front surface and a movable inner cylinder, and the movable inner cylinder has a widened inner cylinder arranged so as to move in parallel with the side of the fixed cylinder. It is comprised with the rocking | fluctuation outer cylinder which can rock | fluctuate in the outer periphery of a wide inner cylinder. A notch is formed in the main cutter head attached to the front of the shield body so that the sub cutter head smaller than the main cutter head can protrude from the notch to the outer periphery of the excavated part by the main cutter head. It swings with a swing arm. Then, the widened portion is excavated by the sub cutter head, and the widened inner cylinder is moved in the widening direction to widen the shield body itself.

However, in any of these cases, the structure of the widening machine for widening is complicated and expensive, the workability of the widening part is poor, and the segments of the widening part have a heavy structure.
JP 2005-60989 A JP 2004-316407 A JP 2004-270226 A JP 2002-70484 A

  The problems of the present invention are that the widening machine can have a simple structure, widening workability is good, the construction period can be shortened and the construction cost can be reduced, and the wide section can be widened. It is an object to provide a tunnel widening method and a tunnel widening apparatus that are highly reliable and can reduce the structure of the segments.

  The tunnel widening method of the present invention comprises a widening machine comprising a front cylinder for excavation having a cutter and a rear cylinder for prelining, and excavating a natural ground with the front cylinder with the cutter to form a main body cylinder of a shield machine. After projecting from the inside and filling the excavation site with a filler for stabilizing ground, the front trunk is pulled back into the main body of the shield machine, and then the front trunk and the rear trunk are combined to create a shield machine. Extruded into the stabilization area by the filler from inside the main body of the main body, digging a widening machine combining the front and rear cylinders simultaneously with the excavation of the shield machine, and excavating into the cross-sectional shape of the widening machine, from there Pre-lining with segments or concrete.

  As a cross-sectional form of the widening machine, if the front cylinder and the rear cylinder are made into a circular arc cross section that becomes a hollow cross section, a slit is excavated into a cross-sectional arc shape in the front cylinder, and a pre-lining with a circular arc cross section from the rear cylinder to Can be constructed. In this case, when the widening machine having a circular arc cross section that is a hollow cross section is divided into a plurality of blocks, the size of the prelining can be varied depending on the number of combinations.

  As another cross-sectional form, the front and rear cylinders have an arc-shaped outer shape that is not a hollow cross section, and the entire cross-section of the arc shape is excavated in the front cylinder, and pre-lining with an arc-shaped cross section is constructed from the rear trunk. May be.

  It is possible to project the front cylinder with an overhanging cutter provided on the outer peripheral surface of the front cylinder of the widening machine, and to dig the widening machine with the excavation cutter provided on the front surface of the front cylinder.

  In the tunnel widening device of the present invention, a widening machine is constituted by a front trunk for excavation and a rear trunk for prelining, and the front trunk and the rear trunk are projected and stored with respect to the main body of the shield machine. The front cylinder is provided with a cutter for excavation on the front surface and an overhanging cutter on the outer surface, and the rear cylinder can be subjected to concrete placement or segment assembly for prelining. Yes.

  According to the present invention, the front drum of the widening machine is excavated from the main body of the shield machine by excavating the natural ground with its cutter, and the natural material is stabilized by filling the filler while pulling it back to the main body. After that, the front and rear cylinders are combined and extruded into the filling area of the filler, and the widening machine combining the front and rear cylinders is dug simultaneously with the shield machine, and the cross-sectional shape of the widening machine Since a pre-lining with segments or concrete is constructed from the rear trunk, a preparatory work for the widened portion can be performed simultaneously with the shield excavation, and the construction period can be shortened.

  The widening machine is provided with an overhanging cutter on the side surface of the front cylinder and an excavation cutter on the front surface, and can be pre-lined from the rear cylinder.

  Since the widening machine can be collected in the main body of the shield machine, the construction cost can be kept low even when several emergency parking zones are constructed on one line.

  As in the inventions of claim 2 and claim 7, slit excavation is performed in a circular arc shape in the front cylinder of the widening machine, and pre-lining in the circular arc shape is applied to the slit from the rear cylinder, or in claim 3 and As in the invention of claim 8, an arc-shaped entire cross section is excavated in the front cylinder, and a pre-lining for the widened portion is constructed by constructing a pre-lining in an arc shape in the cross section from the rear cylinder. Therefore, it is possible to widen the large cross section, the degree of freedom and stability of the frame structure is high, and the segment can be lightened.

  As in the fifth aspect of the invention, when the widening machine having a circular arc cross-section having a hollow cross section is divided into a plurality of blocks and the number of combinations is changed, the size of the prelining can be arbitrarily changed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the shield machine 1 includes a widening machine 3 that can be housed in the main body body 2. The widening machine 3 is composed of a front cylinder 3A and a rear cylinder 3B that can be separated and combined, and the front cylinder 3A and the rear cylinder 3B can be projected from the side surface of the main body cylinder 2 so that they can be shielded. 1 can be individually translated along the radial line.

  In the widening machine 3 of the first embodiment, the front cylinder 3A and the rear cylinder 3B have a circular arc cross section in which a hollow cross section is formed, that is, a C cross section. An overhanging cutter 4 is mounted on the outer peripheral surface of the front barrel 3A, and an excavation cutter 5 is mounted on the front surface of the front barrel 3A.

  The construction procedure of the widened portion by the shield machine 1 equipped with such a widening machine 3 will be described as follows.

  As shown in FIG. 1, only the front trunk 3A is parallel to the outside with respect to the shield machine 1 while the front trunk 3A is separated from the rear trunk 3B and the ground is excavated by the overhanging cutter 4 of the front trunk 3A. It can be moved and overhang from the main body trunk 2.

  As shown in FIG. 2, a soft filler (such as gelled mud water) 6 is filled in the excavation site while the front barrel 3A is pulled back into the body barrel 2 to stabilize the ground. By extending and retracting the front barrel 3A several times, a stabilization region by the filler 6 for projecting the entire widening machine 3 is secured.

  As shown in FIG. 3, the front cylinder 3 </ b> A and the rear cylinder 3 </ b> B are joined and extruded into a stabilization region by the filler 6.

  As shown in FIG. 4, in order to dig the widening machine 3 simultaneously with the digging of the shield machine 1, the excavation cutter 5 on the front surface of the front barrel 3A is excavated into a C-shaped slit, Next, the prelining 7 is applied from the rear trunk 3B. As shown in FIG. 5, the applied pre-lining 7 having a C-shaped cross section serves as a leading construction for the widened portion of the shield tunnel 8.

  As a pre-lining construction method, while excavating into a C-shaped slit shape with the excavation cutter 5 of the front barrel 3A, as shown in FIGS. 7 and 8, concrete is placed behind the rear barrel 3B, Pre-lining with concrete. In addition, there is also a method in which a segment is sent out from the main body barrel 2 of the shield machine 1 to the rear of the rear barrel 3B while excavating into a C-shaped slit, and pre-lining by the segment is performed.

  After completion of the pre-lining, the coupled front cylinder 3A and rear cylinder 3B are translated inward with respect to the shield machine 1 and recovered in the main body cylinder 2.

  FIG. 6 shows that after the pre-lining is completed, a part of the shield tunnel 8 is removed and the inside of the pre-lining 7 is excavated, and then the segment 9 is assembled along the inner surface of the pre-lining 7. It is the state which completed the construction of the whole housing | casing containing the continuous wide part.

  As shown in FIGS. 7 and 8, as the overhanging cutter 4 and the excavation cutter 5, the roller cutter group 11 is arranged in a plurality of rows along the arc of the front barrel 3 </ b> A, and the inside of the main body portion 2 of the shield machine 1. When the motor 12 is rotated, the overhanging cutter 4 and the excavation cutter 5 can be used in combination by the roller cutter group 11. In addition, each of the overhanging cutter 4 and the excavation cutter 5 can be composed of a large and small circular rotating cutter or a swinging cutter.

  If the widening machine 3 composed of the front cylinder 3A and the rear cylinder 3B is divided into a plurality of blocks and the blocks can be added as shown in FIG. 9 and FIG. It is possible and the size of the cross section can be varied.

  In the above-described first embodiment, the widening machine 3 has a cross-sectional arc shape having a hollow cross section, that is, a cross-section C-shaped prelining 7. In the second embodiment, as shown in FIG. The widening machine 3 constituted by 3A and the rear cylinder 3B is made into an arc-shaped outer shape which is not a hollow section, and the entire arc-shaped section is excavated by the front cylinder 3A.

  That is, as shown in FIG. 11, while separating the front cylinder 3A from the rear cylinder 3B and excavating natural ground with the overhanging cutter 4 of the front cylinder 3A, only the front cylinder 3A is outside the shield machine 1. Can be translated from the main body trunk 2.

  As shown in FIG. 12, a soft filler (such as gelled mud water) 6 is filled in the excavation site for stabilizing the natural ground while pulling the front barrel 3A back into the main body barrel 2. By extending and retracting the front barrel 3A several times, a stabilization region by the filler 6 for projecting the entire widening machine 3 is secured.

  As shown in FIG. 13, the front cylinder 3 </ b> A and the rear cylinder 3 </ b> B are joined and extruded into a stabilization region by the filler 6.

  As shown in FIG. 14, in order to simultaneously excavate the widening machine 3 in accordance with the excavation of the shield excavator 1, the excavation cutter 5 on the front surface of the front trunk 3A is excavated on the entire cross section of the outer arc. Then, the segment 13 is assembled from the rear trunk 3B and pre-lining is applied.

  As shown in FIG. 15, the pre-lining having a C-shaped cross section constructed in the segment 13 becomes a widened portion that is continuous with the segment 10 of the shield tunnel 8 as it is.

In the construction procedure of Example 1 of this invention, the state which protrudes the front trunk | drum of a widening machine from the main body trunk | drum part of a shield machine is shown, (A) is a perspective view, (B) is a top view. The state which is filled with a filler is shown, drawing a front trunk into a shield machine, (A) is a perspective view, (B) is a top view. The state which extruded the widening machine which combined the front cylinder and the rear cylinder to the stabilization area | region by a filler is shown, (A) is a perspective view, (B) is a top view. The state which digs a widening machine and constructs the prelining by concrete simultaneously with the excavation of a shield machine is shown, (A) is a perspective view, (B) is a plan view. . It is a simplified sectional view showing a pre-lined completed state. FIG. 6 is a simplified cross-sectional view of a state where the construction of the entire casing including the widened portion continuous with the shield tunnel segment is completed after completion of the pre-line. It is a simplified sectional view showing the concrete placement from the cutter of the front drum and the rear drum of the widening machine. FIG. 8 is a simplified cross-sectional view in a direction different from FIG. 7. It is a simplified sectional view of a main body part of a front body and a shield machine. It is a simplified sectional view showing that the size of the cross section of the prelining can be varied by dividing the widening machine 3 into a plurality of blocks and adding the blocks. In the construction procedure of Example 2 of this invention, the state which protrudes the front trunk | drum of a widening machine from the main body trunk | drum part of a shield machine is shown, (A) is a perspective view, (B) is a top view. The state which is filled with a filler is shown, drawing a front trunk into a shield machine, (A) is a perspective view, (B) is a top view. The state which extruded the widening machine which combined the front cylinder and the rear cylinder to the stabilization area | region by a filler is shown, (A) is a perspective view, (B) is a top view. The state which digs a widening machine and constructs the prelining by concrete simultaneously with the excavation of a shield machine is shown, (A) is a perspective view, (B) is a plan view. It is a simplified sectional view showing a completed state of the widened portion that is continuous with the segment of the shield tunnel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield engraving machine 2 Main body trunk part 3 Widening machine 3A Front trunk 3B Rear trunk 4 Overhanging cutter 5 Excavation cutter 6 Filler 7 Prelining 8 Shield tunnel 9 · 10 · 13 Segment 11 Roller cutter group 12 Motor

Claims (8)

  A widening machine is composed of a front cylinder for excavation with a cutter and a rear cylinder for pre-lining, and the front cylinder is excavated from the main body of the shield machine by excavating a natural ground with the cutter. After filling the body with the filler for stabilizing the ground, pull the front trunk back into the main body of the shield machine, and then combine the front and rear trunks with the filler from the main body of the shield machine. Extrusion into the stabilization area, a widening machine combining the front and rear cylinders is excavated at the same time as the shield machine and excavated into the cross-sectional shape of the widening machine, and pre-lining with segments or concrete from the rear cylinder A tunnel widening method characterized by:   The front drum and the rear drum of the widening machine are formed in a circular arc shape having a hollow cross section, and a slit is excavated in a circular arc shape in the front drum, and a pre-lining in a circular arc shape is applied to the slit from the rear drum. The tunnel widening method according to claim 1.   The front and rear cylinders of the widening machine have an arc-shaped outer shape that is not a hollow section, and the entire section of the arc shape is excavated by the front cylinder, and pre-lining with an arc-shaped section is constructed from the rear cylinder. The tunnel widening method according to claim 1.   2. The front barrel is stretched with a projecting cutter provided on the outer peripheral surface of the front barrel of the widening machine, and the widening machine is dug with the excavation cutter provided on the front surface of the front trunk. The tunnel widening method according to 2 or 3.   3. The tunnel widening method according to claim 2, wherein the widening machine having a circular cross section that is a hollow cross section is divided into a plurality of blocks, and the size of the prelining is variable depending on the number of combinations.   A widening machine is composed of a front cylinder for excavation and a rear cylinder for prelining, and these front cylinders and rear cylinders can be projected and stored with respect to the main body of the shield machine. Is equipped with a cutter for excavation on the front side and a cutter for overhanging on the outer side, and the rear trunk can be concretely placed for pre-lining or segment assembly. apparatus.   The front and rear cylinders of the widening machine have a circular arc cross section with a hollow cross section, and the front cylinder is slit excavated into a circular arc cross section, and pre-lining with a circular arc cross section is applied to the slit from the rear cylinder. The tunnel widening apparatus according to claim 6.   The front and rear cylinders of the widening machine have an arc shape that is not a hollow cross section, and the entire front section of the arc shape is excavated by the front cylinder, and a pre-lining with a circular arc shape is constructed from the rear cylinder. The tunnel widening apparatus according to claim 6, wherein:

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