JP2010084395A - Excavating system for tunnel enlargement and method for excavating for tunnel enlargement - Google Patents

Excavating system for tunnel enlargement and method for excavating for tunnel enlargement Download PDF

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Publication number
JP2010084395A
JP2010084395A JP2008253774A JP2008253774A JP2010084395A JP 2010084395 A JP2010084395 A JP 2010084395A JP 2008253774 A JP2008253774 A JP 2008253774A JP 2008253774 A JP2008253774 A JP 2008253774A JP 2010084395 A JP2010084395 A JP 2010084395A
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Japan
Prior art keywords
jack
tunnel
steel shell
rear
excavator
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JP2008253774A
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Japanese (ja)
Inventor
Hiroyuki Ito
Kazuhiko Matoba
Kenta Matsubara
Keizo Miki
Yoshito Nakajima
Kiyoshi Saito
慶造 三木
芳人 中島
広幸 伊藤
潔 斎藤
健太 松原
一彦 的場
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Ihi Corp
Ohbayashi Corp
株式会社Ihi
株式会社大林組
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Priority to JP2008253774A priority Critical patent/JP2010084395A/en
Publication of JP2010084395A publication Critical patent/JP2010084395A/en
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Abstract

To provide a tunnel expansion excavation system and a tunnel expansion excavation method which can shorten the construction period, reduce costs, and improve workability.
An excavator 5 digs a natural ground in a circumferential direction along an outer peripheral surface of an existing tunnel 1 in order to expand a part of the existing tunnel 1. And the rear trunk 12 are slidably superposed and the propulsion jack 13 in the excavator 5 is extended in a state where the stroke of the main pushing jack 4 in the start pit 3 is fixed, so that the front trunk 11 becomes the rear trunk 12. On the other hand, after pushing forward, the main jack 4 is extended with the stroke of the propulsion jack 13 freed, and the steel shell 6 and the rear barrel 12 are pushed together in the direction of the front barrel 11, and then the main pusher is pushed. The jack 4 is contracted, and a new steel shell 6 is installed in the start shaft 3 between the main push jack 4 and the existing steel shell 6.
[Selection] Figure 1

Description

  The present invention relates to a tunnel expansion excavation system for expanding a part of an existing tunnel and a excavation method using the same.

  As a method for expanding the diameter of a part of an existing tunnel, such as when an emergency parking zone is provided in a part of a road tunnel, an expansion shield method shown in FIG. 7 is known (see Patent Documents 1 and 2). . This expansion shield method will be described.

  First, as shown to Fig.7 (a), it connects with the bottom part of the existing tunnel 1, and constructs a circumference shield start base (start mine 3). A circumferential shield 40 (hand digging or mechanical type) is started from the start pit 3 and is digged along the circumferential direction of the existing tunnel 1. The circumferential shield 40 is engaged with a guide groove 42 provided along the circumferential direction on the outer peripheral surface of the existing tunnel 1, and is dug so as not to be separated from the existing tunnel 1.

  In accordance with the excavation of the circumferential shield 40, the circumferential segment 43 is assembled inside the circumferential shield 40, and an enlarged diameter portion by the circumferential segment 43 is constructed between the start shaft 3 and the circumferential shield 40. . The circumferential shield 40 is caused to make a round along the outer periphery of the existing tunnel 1, and as shown in FIG. Inside the expansion shield starting base 44, a donut-shaped (ring-shaped) expansion shield 41 (hand digging type) is assembled and accommodated.

  As shown in FIG. 7 (c), the expansion shield 41 is dug out along the existing tunnel 1 by digging up the front surface of the expansion shield start base 44, and the expansion segment 45 is assembled inside the expansion shield 41. An expansion tunnel with an expansion segment 45 is constructed between the shield start base 44 and the expansion shield 41. A part of the existing tunnel 1 is expanded in diameter by this enlarged tunnel.

Japanese Examined Patent Publication No. 62-16310 Japanese Examined Patent Publication No. 62-17078

  By the way, in the above-described expansion shield method, it is necessary to construct the expansion shield start base 44 in close contact with the existing tunnel 1, so that the circumferential shield 40 is in close contact with the outer peripheral surface of the existing tunnel 1 and is dug in the circumferential direction. Is essential.

  For this reason, an engagement fitting (not shown) provided on the circumferential shield 40 is engaged with a guide groove 42 provided on the outer peripheral surface of the existing tunnel 1 so that the circumferential shield 40 extends along the circumferential direction of the existing tunnel 1. However, there is a possibility that the engagement fitting is fixed to the guide groove 42 due to a cause such as foreign matter being caught.

  Further, when the existing circumferential segment 43 is pressed by a plurality of propulsion jacks (not shown) provided in the circumferential shield 40 to advance the circumferential shield 40, the propulsion jack presses the circumferential segment 43. If the pressing force at the time is biased on the left and right in FIG. 7A, the left and right engagement metal fittings and the guide groove 42 may be distorted and fixed.

  When such sticking occurs, the recovery work takes time, and the construction period is prolonged.

  In addition, a special segment having the guide groove 42 on the outer peripheral surface is required, leading to an increase in cost.

  In addition, when the circumferential segment 43 is assembled inside the circumferential shield 40, it cannot be said that assembling the circumferential segment 43 inside the narrow circumferential shield 40 is good in workability.

  In addition, since the excavation in the circumferential direction of the existing tunnel 1 by the circumferential shield 40 and then the excavation in the axial direction of the existing tunnel 1 by the expansion shield 41 are necessary, the construction period is prolonged. It was.

  An object of the present invention, which was created in view of the above circumstances, is to provide a tunnel expansion excavation system and a tunnel expansion excavation method which are intended to shorten the construction period, reduce costs, and improve workability.

  In order to achieve the above object, a first invention is an excavation system for excavating a natural ground in a circumferential direction along an outer peripheral surface of an existing tunnel in order to expand a part of the existing tunnel. A main pushing jack installed in a starting pit formed to protrude radially outward, an excavator starting from the starting pit and excavating natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel, A steel shell interposed between the excavator and the main push jack and pushed out by the main push jack, the excavator including a front trunk provided with a cutter for excavating the natural ground, and one end of the steel shell A rear cylinder that is slidably superposed on the front cylinder and the other end is connected to the steel shell, and a propulsion that is interposed between the rear cylinder and the front cylinder and pushes the front cylinder forward with respect to the rear cylinder It has a jack.

  Further, the rear barrel is slidably and tiltably superposed on the front barrel, and the propulsion jack is disposed on the side near the existing tunnel in the excavator, It is preferable to have an outer peripheral side propulsion jack disposed on a side farther from the existing tunnel than the inner peripheral side propulsion jack.

  A second invention is a method for excavating a natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel by using the tunnel expansion excavation system, wherein the stroke of the main pushing jack is fixed. The propulsion jack is extended in the state, the front cylinder is pushed forward with respect to the rear cylinder, and then the main push jack is extended in a state where the stroke of the propulsion jack is liberated, and the steel shell and the rear The barrel is pushed out in the direction of the front barrel, and after dredging, the main jack is contracted, and a new steel shell is installed in the starting pit between the main jack and the existing steel shell. is there.

  Further, when the propulsion jack is extended in a state where the stroke of the main pushing jack is fixed, and the front trunk is pushed forward with respect to the rear trunk, the inner circumferential propulsion jack and the outer circumferential propulsion jack By adjusting the respective extension strokes, it is preferable to extrude the front cylinder with respect to the rear cylinder and to adjust the extrusion direction.

  According to the tunnel expansion excavation system and the tunnel expansion excavation method according to the present invention, the construction period can be shortened, the cost can be reduced, and the workability can be improved.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an explanatory diagram illustrating a tunnel expansion excavation system and a tunnel expansion excavation method using the system according to the present embodiment.

  The existing tunnel 1 shown in FIG. 1 is formed so as to extend in the direction of the front and back of the drawing, and a floor slab 2 for running a vehicle is installed inside the existing tunnel 1. When an emergency parking zone or the like is formed in such an existing tunnel 1 for roads, the tunnel enlargement excavation system and the tunnel enlargement excavation method according to the present embodiment are used, and a part of the existing tunnel 1 in the longitudinal direction is enlarged. To do.

  This excavation system for tunnel expansion excavates natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel 1 in order to expand a part of the existing tunnel 1, A main push jack 4 installed in the start pit 3 protruding so as to protrude from the start pit 3, and an excavator 5 that starts from the start pit 3 and digs natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel 1, A steel shell 6 interposed between the excavator 5 and the main pushing jack 4 and pushed out by the main pushing jack 4 is provided.

  The starting pit 3 is formed to protrude downward on the wall surface 1 a at the bottom of the existing tunnel 1, and is connected to the existing tunnel 1 by removing the wall surface 1 a at the bottom of the existing tunnel 1. Inside the start pit 3, a main push jack 4 for pushing out the excavator 5 and the steel shell 6 is installed.

  One end of the main push jack 4 is connected to an anchor 7 fixed to the start shaft 3, and the other end is connected to a pressing portion 8 formed in a frame shape in accordance with the cross sections of the excavator 5 and the steel shell 6. . The pressing portion 8 is brought into contact with the steel shell 6 or the excavator 5 and is pushed out. The plurality of main push jacks 4 are arranged at intervals in the radial direction of the frame-like pressing portion 8, and can control the pressing force and the stroke, respectively, and can adjust the extrusion direction.

  By controlling the pressing force and stroke of these original push jacks 4 that are arranged at intervals in the radial direction of the existing tunnel 1, the pushing direction approaches the existing tunnel 1 with respect to the tangential direction of the existing tunnel 1. Can be adjusted in the direction or away. A sliding plate 9 is provided at the bottom of the start pit 3 so that the pressing portion 8, the steel shell 6, or the bottom of the excavator 5 is in sliding contact.

  2 is a partially enlarged view of FIG. 1, and FIG. 3 is an explanatory view showing a state in which the excavator of FIG. 2 is operated.

  As shown in FIGS. 2 and 3, the excavator 5 includes a front cylinder 11 provided with a cutter 10 for excavating a natural ground, one end slidably superposed on the front cylinder 11, and the other end connected to a steel shell 6. And a propulsion jack 13 that is interposed between the rear cylinder 12 and the front cylinder 11 and pushes the front cylinder 11 forward with respect to the rear cylinder 12.

  In addition to being slidable with respect to the rear cylinder 12, the front cylinder 11 is superposed so as to be inclined with respect to the rear cylinder 12. The propulsion jack 13 is an inner peripheral propulsion jack 13a disposed on the side closer to the existing tunnel 1 in the excavator 5, and an outer periphery disposed on the side farther from the existing tunnel 1 than the inner peripheral propulsion jack 13a. And a side propulsion jack 13b. The inner peripheral side propulsion jack 13a and the outer peripheral side propulsion jack 13b can control the pressing force and the stroke, respectively, and when the front cylinder 11 is pushed forward with respect to the rear cylinder 12, the extrusion inclination of the front cylinder 11 with respect to the rear cylinder 12 The angle can be adjusted.

  4 is a plan view of the excavator 5 (viewed from the outside in the radial direction of the existing tunnel 1 in FIG. 1), FIG. 5 is a view taken along the line VV in FIG. 4 (front view), and FIG. It is a VI-VI line arrow figure (side view).

  The front trunk 11 is a rectangular cylinder having a long and narrow cross section, and is bent as a whole in accordance with the curve shape in the circumferential direction of the outer peripheral surface of the existing tunnel 1. Specifically, the front trunk 11 is connected to the front trunk bent pipe portion 11a formed by bending according to the curvature of the outer peripheral surface of the existing tunnel 1 and the rear part of the front trunk bent pipe portion 11a, and is formed in a straight shape. And a front trunk straight pipe portion 11b. One end (front portion) of the rear barrel 12 is slidably and tiltably inserted into the front barrel straight pipe portion 11b.

  As shown in FIGS. 2 and 3, a partition wall 14 for partitioning a natural ground and a pit is provided inside the front trunk bent pipe portion 11 a, and a cutter 10 for excavating the natural ground is provided in front of the partition wall 14. Is provided. As shown in FIGS. 4 and 5, the cutter 10 includes four main cutters 10 a arranged in parallel in the longitudinal direction of the partition wall 14, and sub-cutters 10 b respectively disposed at four corners of the partition wall 14. Become.

  The main cutter 10a has a rotating shaft 15a rotated by a driving mechanism (not shown), a spoke 16a provided on the rotating shaft 15a, and a bit 17a attached to the spoke 16a, and the spokes between the adjacent main cutters 10a. It arrange | positions so that the rotational locus of 16a may overlap. The rotations of the main cutters 10a are synchronized so that the spokes 16a do not interfere with each other. A rod-shaped extension cutter 18a is provided at the outer peripheral end of the spoke 16a so as to be able to appear and retract. The extension cutter 18a is appropriately expanded and contracted according to the rotation angle position within which the main cutter 10a makes one rotation so as to excavate the region X that cannot be excavated by the spoke 16a of the adjacent main cutter 10a.

  The sub cutter 10b has a rotating shaft 15b rotated by a driving mechanism (not shown), a spoke 16b provided on the rotating shaft 15b, and a bit 17b attached to the spoke 16b. The sub cutter 10b is disposed behind the main cutter 10a in the excavation direction so as not to interfere with the main cutter 10a. The unexcavated area Y between the sub cutter 10b and the main cutter 10a is excavated by appropriately extending and contracting the extension cutter 18a.

  The main cutter 10a and the sub cutter 10b are not limited to the rotary type described above, and any swinging type, parallel link type, or the like can be used as long as the ground can be excavated into a rectangle according to the cross-sectional shape of the front trunk 11. Alternatively, they may be mixed with the rotary type.

  As shown in FIG. 5, the partition wall 14 is formed with a soil discharge port 19 for discharging the earth and sand excavated by the cutter 10 (the main cutter 10 a and the sub cutter 10 b) from the front to the rear of the partition wall 14. . The soil discharge port 19 is provided in the middle in the vertical direction in FIG. The earth discharge port 19 is usually disposed in the lower part (lower part in the direction of gravity) of the partition wall 14. In the present embodiment, as shown in FIG. 1, the upper and lower sides are reversed as the excavator 5 advances. This is because the top and bottom cannot be considered.

  As shown in FIGS. 2 and 3, on the rear surface of the partition wall 14, a sediment take-out pipe 20 for discharging the excavated earth and sand from the front to the rear of the partition wall 14 is provided at the soil discharge port 19 (see FIG. 5). Connected. The earth and sand take-out pipe 20 is provided with a pinch valve 21. The pinch valve 21 has a flexible cylinder 22 formed in a cylindrical shape from a flexible material such as rubber, and a cylindrical cover 23 that covers the outer peripheral surface of the flexible cylinder 22. The cover 23 and the flexible cylinder The flexible cylinder 22 is deflected inward in the radial direction by injecting fluid such as air or water into the pressure chamber 24 formed between them, and the passage cross-sectional area of the soil passing through the sediment removal pipe 20 To make it variable. By smoothly narrowing and changing the passing cross-sectional area in this way, as shown in FIG. 1, as the excavator 5 advances, the direction of the excavation surface (face surface) by the cutter 10 is horizontal, upward, and downward. Even if the earth pressure (earth load) on the face changes gradually, the change can be easily and accurately followed.

  The earth and sand take-out pipe 20 is provided with an open / close shutter (not shown) for opening and closing the inside of the pipe. The opening / closing shutter is normally opened, and is closed to maintain the earth pressure of the face when the excavation is stopped. Further, a flange 25 is provided at the rear end of the earth and sand take-out pipe 20, and a discharge pipe 26 having a predetermined length (for example, one or two steel shells 6) is provided on the flange 25 with a bolt nut or the like. Connected, the earth removal pipe 26 is added in series and extended to the start pit 3. The earth removal pipe 26 is added in the start pit 3 shown in FIG.

  As shown in FIGS. 2, 4, and 6, the rear cylinder 12 is similar to the front cylinder 11 in that the rear cylinder straight pipe portion 12 a is formed of a rectangular tube having an elongated cross section, and the rear cylinder straight pipe portion 12 a is one. It has a steel shell holder portion 12b made of a large rectangular tube and connected to the rear portion of the rear trunk straight tube portion 12a.

  The rear trunk straight pipe portion 12a is inserted into the front trunk straight pipe portion 11b from the rear, and is slidable and tiltable with respect to the front trunk straight pipe portion 11b. That is, a predetermined gap is provided between the rear trunk straight pipe portion 12a and the front trunk straight pipe portion 11b so that the rear trunk straight pipe portion 12a is slidable and tiltable with respect to the front trunk straight pipe portion 11b. C is provided. A seal 27 for stopping the gap C is provided on the inner peripheral surface of the rear portion of the front trunk straight pipe portion 11b. Since the seal 27 is compressed by the rear trunk straight pipe portion 12a inclined with respect to the front trunk straight pipe portion 11b, the seal 27 has appropriate flexibility.

  The steel shell holder portion 12b of the rear shell 12 is formed in an elongated rectangular tube shape in accordance with the cross-sectional shape of the steel shell 6, and at the rear end thereof is mounted in a square frame shape so that the steel shell 6 is mounted. A frame portion 12c is provided. The steel shell 6 is formed of a square tube having the same cross-sectional shape as the steel shell holder portion 12b. The steel shell 6 and the mounting frame portion 12c are connected by a bolt nut, and the steel shells 6 are also connected by a bolt nut. The steel shell 6 is added inside the start shaft 3 shown in FIG.

  As shown in FIGS. 2 and 3, a propulsion jack 13 is interposed between the front trunk straight pipe portion 11b and the rear trunk straight pipe portion 12a. One end of the propulsion jack 13 is attached to a flange 28 provided on the inner peripheral surface of the front trunk straight pipe portion 11b, and the other end is attached to a flange 29 provided on the inner peripheral surface of the rear trunk straight pipe portion 12a. Yes. A plurality of the propulsion jacks 13 are arranged at intervals in the circumferential direction of the rear trunk straight pipe portion 12a and the front trunk straight pipe portion 11b, and are arranged on the side close to the existing tunnel 1 in the excavator 5. It has an inner peripheral side propulsion jack 13a and an outer peripheral side propulsion jack 13b disposed on the side farther from the existing tunnel 1 than the inner peripheral side propulsion jack 13a. The inner peripheral side propulsion jack 13a and the outer peripheral side propulsion jack 13b can control the pressing force and the stroke, respectively, and when the front cylinder 11 is pushed forward with respect to the rear cylinder 12, the extrusion inclination of the front cylinder 11 with respect to the rear cylinder 12 The angle can be adjusted.

  The tunnel expansion method using the above tunnel expansion system will be described.

  First, in FIG. 1, the excavator 5 is set inside the start pit 3. That is, the excavator 5 is placed on the sliding plate 9 with its rear end in contact with the pressing portion 8. Thereafter, the propulsion jack 13 in the excavator 5 is extended in a state where the stroke of the main pushing jack 4 is fixed, and the front trunk 11 is pushed forward with respect to the rear trunk 12. Then, the start wall 3 a of the start pit 3 is dug out with the cutter 10 of the front trunk 11. The starting wall 3 a is made of a material (such as mortar) that can be excavated by the cutter 10. Thereafter, the main pushing jack 4 is extended in a state where the stroke of the propulsion jack 13 is free, the rear cylinder 12 is pushed forward, and the polymerization allowance for the front cylinder 11 is made the same as the initial polymerization allowance. The flange 28 in the front cylinder 11 shown in FIG. 2 serves as a stopper with which the tip of the rear cylinder 12 abuts.

  In this way, the first step of extending the propulsion jack 13 to push the front barrel 11 forward while the stroke of the main push jack 4 is fixed, and the main push jack 4 with the stroke of the propulsion jack 13 being made free. The second step of extending and pushing the rear cylinder 12 forward is repeated, and when the rear cylinder 12 advances by the length of one piece of the steel pipe 6, the main jack 4 is contracted, and the main jack 4 and the rear cylinder A steel shell insertion space is formed between the steel shell 6 and the steel shell 6 in the start pit 3. If the stroke of the main jack 4 is equal to or longer than the length of one steel pipe 6, the first and second steps do not need to be repeated many times, and only need to be performed once.

  Thereafter, similarly, after the front cylinder 11 is pushed forward with respect to the rear cylinder 12 in the first step of extending the propulsion jack 13 with the stroke of the main pushing jack 4 fixed, the stroke of the propulsion jack 13 can be freely set. In this state, the steel shell 6 and the rear trunk 12 are integrally pushed in the direction of the front trunk 11 by the second step of extending the main push jack 4 and the excavator 5 consisting of the front trunk 11 and the rear trunk 12 is taken as a whole. Move forward. And if the excavator 5 advances the length of one steel shell 6, the main pushing jack 4 will be shrunk, and a steel shell insertion space will be formed between the main pushing jack 4 and the existing steel shell 6, A new steel shell 6 is installed in the start pit 3 and added to the existing steel shell 6. When the steel shell 6 is added, the earth removal pipe 26 is also added to the existing earth removal pipe 26 in the start pit 3.

  Such first and second steps are repeated until the excavator 5 makes a round along the outer peripheral surface of the existing tunnel 1, that is, until the excavator 5 returns to the start pit 3. Thereby, the steel shell 6 is constructed in a link shape along the outer peripheral surface of the existing tunnel 1.

  Thereafter, in the existing tunnel 1, the segment 1 b of the existing tunnel 1 included in the steel shell 6 is removed, and the wall portion 6 b on the inner peripheral side of the steel shell 6 is further removed, so that a part of the existing tunnel 1 becomes a steel shell. 6, the diameter is expanded. This enlarged diameter portion is used as an emergency parking zone for the existing tunnel 1 used as a road tunnel.

  As shown in FIG. 5, the excavator 5 for excavating the enlarged diameter portion is formed in a flat rectangular tube shape having a short side and a long side, and the long side is in contact with the outer peripheral surface of the existing tunnel 1. In this way, the length of the long side becomes the length in the tunnel axis direction of the enlarged diameter portion. Therefore, when constructing a diameter-enlarged portion having a length of 10 meters, the excavator 5 having a long side length of 10 meters may be used, and the outer periphery of the existing tunnel 1 may be rotated once. In the conventional type shown in FIG. 7, circumferential excavation and axial excavation are performed using two shield machines, ie, a circumferential shield 40 and an expansion shield 41. In this embodiment, one excavator 5 is used. Therefore, the excavation can be shortened and the cost can be reduced.

  In this embodiment, in FIG. 1, after the front barrel 11 is advanced with respect to the rear barrel 12 by the propulsion jack 13 (first step), the steel shell 6 and the rear barrel 12 are integrally moved forward by the main push jack 4. Since the steel shell 6 and the rear cylinder 12 pushed out by the main pushing jack 4 are not subjected to resistance from the face, the rear cylinder 12 is placed on the inner peripheral surface of the front cylinder 11. It is smoothly inserted into the front barrel 11 while being guided. Therefore, even if the pushing direction of the main push jack 4 is greatly different from the digging direction of the excavator 5, the excavator 5 can be dug accurately along the outer peripheral surface of the existing tunnel 1.

  In the present embodiment, the excavator 5 can be accurately dug along the outer peripheral surface of the existing tunnel 1 without using the guide rail 42 that is essential in the conventional type of FIG. The problem (problem of construction period extension) can be avoided. In addition, the special segment with the guide rails 42 is not necessary, thereby reducing the cost.

  In FIG. 1, when a new steel shell 6 is added to the existing steel shell 6, the new steel shell 6 is suspended from the existing tunnel 1 into the start shaft 3 and added to the existing steel shell 6. Therefore, the work can be performed in a state where a sufficient work space is secured, and the workability is improved and the construction period is shortened. On the other hand, in the conventional type shown in FIG. 7, when the circumferential segment 43 is assembled inside the circumferential shield 40, assembling the circumferential segment 43 inside the narrow circumferential shield 40 is easy to work. I can't say that. In the present embodiment, the steel shell 6 newly added in the start shaft 3 of FIG. 1 is divided into a plurality of pieces, and these pieces are attached to the existing steel shell 6 in the start shaft 3, You may assemble in a ring shape.

  Further, in FIG. 1, when the steel pipe 6 added in the start pit 3 is pushed out by the main pushing jack 4, the pressing force and stroke of each of the main pushing jacks 4 arranged at intervals in the radial direction of the existing tunnel 1. By controlling each of these, the direction of extrusion can be adjusted in the direction approaching or leaving the existing tunnel 1 with the tangential direction of the existing tunnel 1 as a reference. Thereby, the extrusion direction of the steel shell 6 can be finely adjusted accurately in the direction along the outer peripheral surface of the existing tunnel 1.

  Further, as shown in FIGS. 2 and 3, when the front barrel 11 is pushed forward with respect to the rear barrel 12 by the propulsion jack 13, the pressing force and stroke of the outer circumferential side propulsion jack 13b are changed to the inner circumferential side propulsion jack 13a. By making it larger than the pressing force and stroke, the front trunk 11 (front trunk straight pipe portion 11b) can be pushed out while being inclined toward the existing tunnel 1 with respect to the rear trunk 12 (rear trunk straight pipe portion 12a). The excavation along the outer peripheral surface of the tunnel 1 can be performed accurately.

  That is, when the front jack 11 is pushed forward with respect to the rear drum 12 by the propulsion jack 13, the pressing force and the stroke of the inner peripheral propulsion jack 13a and the outer peripheral propulsion jack 13b are controlled, respectively. On the other hand, the extrusion inclination angle of the front cylinder 11 with respect to the rear cylinder 12 when the front cylinder 11 is pushed forward can be precisely finely adjusted in the direction along the outer peripheral surface of the existing tunnel 1.

  Further, the front cylinder 11 pushed out by the propulsion jack 13 has a bent shape along the curved shape of the outer peripheral surface of the existing tunnel 1 as a whole from the front trunk bent pipe part 11a and the front trunk straight pipe part 11b. By being pushed out, it receives a reaction force from the side ground and is deflected to the existing tunnel 1 side.

  The present invention is not limited to the above embodiment.

  The front cylinder 11 may be formed in a straight shape, and the front cylinder 11 and the rear cylinder 12 may not be bent as long as they can slide. Moreover, the front trunk | drum 11 and the rear trunk | drum 12 may be shape | molded according to the curve shape of the outer peripheral surface of the existing tunnel 1, and may be superposed | polymerized so that sliding is possible.

It is explanatory drawing which shows the tunnel expansion excavation system which concerns on this embodiment, and the tunnel expansion excavation method using the system. It is the elements on larger scale of FIG. It is explanatory drawing which shows a mode that the excavator of FIG. 2 was operated. FIG. 3 is a plan view of the excavator 5 (a diagram viewed from the radial outside of the existing tunnel of FIG. 1). It is a VV arrow line figure (front view) of FIG. It is a VI-VI line arrow directional view (side view) of FIG. It is explanatory drawing which shows the process of the conventional tunnel expansion excavation system and tunnel expansion excavation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing tunnel 3 Starting pit 4 Main push jack 5 Excavator 6 Steel shell 11 Front trunk 12 Rear trunk 13 Propulsion jack 13a Inner peripheral side propulsion jack 13b Outer peripheral side propulsion jack

Claims (4)

  1. In order to expand a part of an existing tunnel, the excavation system excavates natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel,
    A main jack installed in a starting pit formed to protrude radially outward in the existing tunnel;
    An excavator that starts from the starting pit and excavates natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel;
    A steel shell interposed between the excavator and the main push jack and pushed out by the main push jack,
    The excavator is
    A front torso provided with a cutter for excavating the natural ground,
    A rear cylinder having one end slidably superposed on the front cylinder and the other end connected to the steel shell;
    A tunnel expansion excavation system comprising: a propulsion jack that is interposed between the rear cylinder and the front cylinder and pushes the front cylinder forward with respect to the rear cylinder.
  2. The rear torso is slidably and tiltably superimposed on the front torso,
    In the excavator, the propulsion jack is disposed on the side closer to the existing tunnel, and the outer peripheral propulsion is disposed on the side farther from the existing tunnel than the inner circumferential propulsion jack. The tunnel expansion excavation system according to claim 1, further comprising a jack.
  3. Using the excavation system for tunnel expansion according to claim 1 or 2, the excavator is a method of excavating natural ground in the circumferential direction along the outer peripheral surface of the existing tunnel,
    After extending the propulsion jack in a state where the stroke of the main pushing jack is fixed, and pushing the front cylinder forward with respect to the rear trunk,
    The main push jack is extended with the stroke of the propulsion jack made free, and the steel shell and the rear cylinder are integrally pushed out in the direction of the front cylinder.
    A tunnel enlarging method for tunnel expansion, wherein the main push jack is contracted, and a new steel shell is installed in the start pit between the main push jack and an existing steel shell.
  4. Of the tunnel expansion excavation method according to claim 3, a tunnel expansion excavation method using the tunnel expansion excavation system according to claim 2,
    When the propulsion jack is extended in a state where the stroke of the main push jack is fixed, and the front cylinder is pushed forward with respect to the rear cylinder,
    By adjusting the extension strokes of the inner peripheral side propulsion jack and the outer peripheral side propulsion jack, the front cylinder is pushed out with respect to the rear cylinder, and the pushing direction is adjusted. Tunneling method for tunnel expansion.
JP2008253774A 2008-09-30 2008-09-30 Excavating system for tunnel enlargement and method for excavating for tunnel enlargement Pending JP2010084395A (en)

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Cited By (7)

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JP2014043738A (en) * 2012-08-28 2014-03-13 Shimizu Corp Construction method of heavy-section tunnel
JP2015129411A (en) * 2014-01-08 2015-07-16 清水建設株式会社 Material feeder for use in shield tunnel, and tunnel construction method
JP2015151672A (en) * 2014-02-10 2015-08-24 株式会社大林組 Method of forming widening part of shield tunnel
JP2016084681A (en) * 2014-10-29 2016-05-19 西松建設株式会社 Transport device and transport method
JP2017089379A (en) * 2017-01-31 2017-05-25 大成建設株式会社 Underground structure construction method and underground structure
JP2017089190A (en) * 2015-11-09 2017-05-25 大成建設株式会社 Underground structure construction method
CN109026035A (en) * 2018-09-10 2018-12-18 中山大学 Tunnel circumferential direction variable cross-section digs method

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JPS59102096A (en) * 1982-12-03 1984-06-12 Mitsui Constr Circumferential shield drilling machine
JPS6216310B2 (en) * 1982-07-26 1987-04-11 Mitsui Constr
JPS6217078B2 (en) * 1982-12-08 1987-04-15 Mitsui Constr
JP2007303134A (en) * 2006-05-10 2007-11-22 Tohoku Oshima Kogyo Kk Sealing device of buckling shield machine

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JPS6216310B2 (en) * 1982-07-26 1987-04-11 Mitsui Constr
JPS59102096A (en) * 1982-12-03 1984-06-12 Mitsui Constr Circumferential shield drilling machine
JPS6217078B2 (en) * 1982-12-08 1987-04-15 Mitsui Constr
JP2007303134A (en) * 2006-05-10 2007-11-22 Tohoku Oshima Kogyo Kk Sealing device of buckling shield machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043738A (en) * 2012-08-28 2014-03-13 Shimizu Corp Construction method of heavy-section tunnel
JP2015129411A (en) * 2014-01-08 2015-07-16 清水建設株式会社 Material feeder for use in shield tunnel, and tunnel construction method
JP2015151672A (en) * 2014-02-10 2015-08-24 株式会社大林組 Method of forming widening part of shield tunnel
JP2016084681A (en) * 2014-10-29 2016-05-19 西松建設株式会社 Transport device and transport method
JP2017089190A (en) * 2015-11-09 2017-05-25 大成建設株式会社 Underground structure construction method
JP2017089379A (en) * 2017-01-31 2017-05-25 大成建設株式会社 Underground structure construction method and underground structure
CN109026035A (en) * 2018-09-10 2018-12-18 中山大学 Tunnel circumferential direction variable cross-section digs method
CN109026035B (en) * 2018-09-10 2020-04-07 中山大学 Tunnel annular variable cross section expanding excavation method

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