JP4348856B2 - Construction method and construction structure of the start of a branch shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and a construction structure for a start of a branch shield machine that starts from a side of a tunnel.
[0002]
[Prior art]
As a technology for starting a branch shield machine from the side of a tunnel constructed with a shield machine, the tail part that is slidable in the machine direction at the rear end of the shield frame is expanded and the inside of the tail part (stopped) A special segment is assembled in the water area), the start of the branch shield machine is formed in the special segment, and a part of the branch shield machine is liquid-tightly attached to the start port, and then the main shield shield machine is advanced. It is known that the start opening located inside the tail part (water stoppage area) is exposed to the side ground, and the branch shield machine is started from the start opening (Japanese Patent Laid-Open No. 11). -303568).
[0003]
[Problems to be solved by the invention]
However, in such a technique, since the tail part once expanded is bent inward by the side earth pressure, it may be difficult to contract the tail part again. If the tail part is left expanded, the captain will increase by that amount, which will cause problems in curve construction. Also, if the diameter of the branch shield machine is large, it is necessary to increase the extension stroke of the tail part for the convenience of mounting the branch shield machine at a right angle inside the tail part (water stoppage area) of the main shield machine. Yes, there may be a problem with water stoppage. In addition, since it is necessary to install a part of the branch shield machine at the start of the special segment inside the expanded tail (water stoppage area), various equipment of the main shield machine is installed at the time of installation. It can also be an obstacle.
[0004]
The object of the present invention, which was created in view of the above circumstances, is to provide a method and structure for constructing a launch opening of a branch shield machine on the side of a tunnel without any modification of an extended tail mechanism or the like to the shield machine. Is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a first invention is a method for constructing a start point of a branch shield machine at a side of a tunnel constructed by a shield machine, and a circular arc plate in a tail frame of the shield machine Are connected in the circumferential direction to construct an outer cylindrical ring, and inside the outer cylindrical ring, a reduced diameter segment having an outer diameter smaller than the standard segment is connected in the circumferential direction to construct a reduced diameter ring, and the reduced diameter ring and A first water-stop seal is installed between the outer ring and the outer ring, and the shield machine is moved forward by approximately one ring so that the tail seal at the rear end of the tail frame is pressed against the outer surface of the outer ring. In this state, a new outer cylinder ring is constructed in the same procedure by connecting it in the tail frame in the axial direction of the previous outer cylinder ring, and inside the new outer cylinder ring, the previous reduced diameter ring New diameter-reduced phosphorus connected in the axial direction In the same procedure, the above steps are repeated to construct a reduced diameter tunnel in which the reduced diameter ring is connected in the axial direction, and an outer cylinder hood in which the outer cylinder ring is connected in the axial direction on the outer side is constructed to be slidable. In addition, a second water stop seal is installed along the circumferential direction between the reduced diameter tunnel and the outer cylinder hood, and the reduced diameter tunnel between the first and second water stop seals covered with the outer cylinder hood is provided. A part of the branch shield machine is formed in a part so as to penetrate through the part, and after the part of the branch shield machine is installed in the start port, the outer cylinder hood is slid to expose the start port to the side ground. It is a thing.
[0006]
2nd invention is the construction structure of the start opening formed in order to start a branch shield machine at the side part of the tunnel built with the shield machine, and can be assembled in the tail frame of the shield machine A reduced diameter tunnel constructed by connecting a reduced diameter segment having a small length and a smaller outer diameter than the standard segment in the circumferential direction and the axial direction, and a tail of a shield machine that is slidably fitted outside the reduced diameter tunnel An outer cylinder hood constructed by connecting arc plates of a length that can be assembled in the frame in the circumferential direction and the axial direction, and an axial direction between the inner surface of the outer cylinder hood and the outer surface of the inner diameter reduction tunnel The first and second seals interposed along the circumferential direction at predetermined intervals, and a part of the reduced diameter tunnel covered with the outer cylinder hood between the first and second water-stop seals. Formed branch sea And de excavator start opening, in which a sliding means for sliding the outer cylinder hood axially to expose the start port on the side natural ground.
[0007]
The sliding means may include a wire connected to the end of the outer cylinder hood, and a pulling mechanism that pulls the wire into the tunnel after pulling the wire along the outer surface of the reduced diameter tunnel for a predetermined length. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
[0009]
FIG. 1 is a plan sectional view of the construction structure of the start of the branch shield machine according to this embodiment, and FIG. 2 is a side view thereof. The start port 1 of the branch shield machine is formed to start the branch shield machine 3 on the side of the tunnel 2 constructed by the main shield machine, and the method shown in FIGS. Built.
[0010]
As shown in FIG. 3 (a), the main line shield machine (normal type shield machine) is used to cut the face with a cutter (not shown) provided at the front part of the cylindrical shield frame 4 while shielding the shield frame. 4, the propulsion jack 6 provided on the inner side of the rear tail frame 5 is pressed against the existing segment 7 and extended, the shield frame 4 is dug by the stroke of the propulsion jack 6, and then the propulsion jack 6 is contracted. A new segment 7 is assembled in the empty space and a tunnel is constructed while excavating the natural ground by repeating such operations.
[0011]
Here, the segment 7 assembled inside the tail frame 5 was stopped because the tail seal 8 (brush seal) provided at the rear end of the tail frame 5 was pressed against the outer surface of the existing segment 7. It will be assembled in the area. The tail seal 8 is attached to the inner peripheral surface of the rear end portion of the tail frame 5 along the circumferential direction in two front and rear stages. The tail seal 8 is pressed against the outer peripheral surface of the existing segment 7 by its own spring action. And a gap (tail void) between the existing segment 7 and the existing segment 7 are stopped.
[0012]
The main shield shield machine is used to construct the start port 1 of the branch shield machine 3 shown in FIGS. 1 and 2, and first of all, as shown in FIG. 3 (a), the main shield machine is used. Within the tail frame 5, the standard segment 7 is assembled as usual to construct the standard tunnel 9. Then, the shoe 6a of the propulsion jack 6 is pressed against the end portion of the standard tunnel 9 and extended, and the shield machine (shield frame 4) is moved forward by approximately one ring. Thereafter, the propulsion jack 6 is contracted, and the circular arc plate 10 is connected to the empty space by welding or the like in the circumferential direction to construct the outer cylinder ring 11.
[0013]
The outer diameter of the outer ring 11 is set to be approximately the same as the outer diameter of the standard tunnel 9. After the outer cylinder ring 11 is connected in the axial direction to form the outer cylinder hood 12 as shown in FIGS. 5 and 2, when the outer cylinder hood 12 is slid in the axial direction, the side voids are utilized by utilizing the tail void. The aim is to reduce sliding resistance from the mountain. Further, as shown in FIG. 3 (a), the outer cylinder ring 11 constructed inside the tail frame 5 has a tail seal 8 provided at the rear end of the tail frame 5 with a standard tunnel 9 (existing segment). Since it is pressed against the outer surface of 7), it is constructed in a water-stopped area.
[0014]
Next, as shown in FIG. 3B, inside the outer ring 11, a reduced diameter segment 13 having an outer diameter smaller than that of the standard segment 7 is connected in the circumferential direction by a bolt nut or the like to construct a reduced diameter ring 14. . Since the reduced diameter segment 13 is also connected to the end of the standard tunnel 9, the reduced diameter ring 14 is connected to the standard tunnel 9. When all the diameter-reduced segments 13 are connected in the circumferential direction and the axial direction to constitute a diameter-reduced tunnel 15 described later, in order to form the start opening 1 of the branch shield machine 3 shown in FIGS. Part 13a is removable.
[0015]
In addition, a first water stop seal 16 a (such as rubber) that stops water between the outer diameter ring 11 is attached to the reduced diameter segment 13. The first water seal 16a is attached to the outer surface of each reduced diameter segment 13 in an arc shape along the circumferential direction, and when each reduced diameter segment 13 is connected in the circumferential direction to become a reduced diameter ring 14, It is continuously connected in the direction to form a ring body. In addition, not only this structure but the ring-shaped 1st water stop seal 16a is temporarily fixed beforehand to the internal peripheral surface of the said outer cylinder ring 11, and the diameter reducing segment 13 is assembled | assembled from it, and the diameter reducing ring 14 is constructed | assembled. Thus, a ring-shaped first water stop seal 16 a may be interposed between the reduced diameter ring 14 and the outer cylinder ring 11.
[0016]
Next, as shown in FIG. 3 (c), the shoe 6a of the propulsion jack 6 is pressed against the end portion of the reduced diameter ring 14 to be extended, and the shield machine (shield frame 4) is moved forward by approximately one ring. At this time, since the tail seal 8 provided at the rear end of the tail frame 5 is pressed against the outer surface of the outer cylinder ring 11, water stoppage between the tail frame 5 and the outer cylinder ring 11 is ensured. Specifically, since the outer diameter of the outer ring 11 is set to be approximately the same as the outer diameter of the standard tunnel 9, the water stop gap hardly changes from the previous stage shown in FIG. Since 8 is pressed against the outer surface of the outer cylinder ring 11 by its spring action, water can be stopped without any problem. Moreover, the water stop between the outer cylinder ring 11 and the reduced diameter ring 14 is made by the first seal 16a.
[0017]
Next, as shown in FIG. 3 (d), the propulsion jack 6 is contracted, and the same procedure is performed using an arc plate 10 at the tip end in the axial direction of the outer cylinder ring 11 using the empty space. The new outer cylinder ring 11 constructed in the above is connected. That is, in the empty space, a new outer cylinder ring 11 is connected to the previous outer cylinder ring 11 by connecting the circular arc plate 10 to the circumferential direction and the tip of the previous outer cylinder ring 11 by welding or the like. At this time, since the previous outer cylinder ring 11 protrudes forward from the reduced diameter ring 14, the arc plate 10 can be easily butted and welded to the tip. Note that the shoe 6a is eccentric and rotatable around the shaft, and as shown in FIG. 3 to FIG. 4, when pressing the reduced diameter segment 13, it is drawn inward in the radial direction to avoid the outer cylinder ring 11. As shown in FIG. 5, when the standard segment 7 is pressed, it is rotated 180 degrees to press the central portion.
[0018]
Next, as shown in FIG. 3 (e), the inner diameter of the new outer ring 11 is constructed at the tip end in the axial direction of the previous reduced diameter ring 14 using the reduced diameter segment 13 in the same procedure. A new reduced diameter ring 14 is connected. That is, inside the new outer ring 11, the diameter-reduced segment 13 is connected to the tip of the diameter-reduced ring 14 in the circumferential direction and the diameter-reduced ring 14 with a bolt nut or the like, so 14 are connected and provided. This diameter-reduced segment 13 also has a part 13a that can be removed in order to form the start opening 1 of the branch shield machine 3 when the diameter-reduced tunnel 15 shown in FIGS.
[0019]
Thereafter, by repeating the same procedure, as shown in FIG. 4, a reduced diameter tunnel 15 connected to the standard tunnel 9 and connected to the reduced diameter ring 14 is constructed, and an outer cylinder is formed outside the reduced diameter tunnel 15. An outer cylinder hood 12 to which the ring 11 is connected is slidably fitted. The reduced diameter tunnel 15 is constructed by connecting the reduced diameter segments 13 having a length that can be assembled in the tail frame 5 and having an outer diameter smaller than that of the standard segment 7 in the circumferential direction and the axial direction. The arc plate 10 having a length that can be assembled in the frame 5 is connected in the circumferential direction and the axial direction.
[0020]
As shown in FIG. 2, the length of the outer hood 12 in the axial direction is set to a length that can cover the start opening 1 opened in the reduced diameter tunnel 15. A plurality of wire attachment portions 18 to which the wires 17 are attached are provided at predetermined intervals in the circumferential direction at the distal end portion of the last outer cylinder ring 11 shown in FIG. Further, the final diameter reducing ring 14 shown in FIG. 4 is provided with a second water stop seal 16b similar to the diameter reducing ring 14 shown in FIG. 3 (b). The ring-shaped second water seal 16b is temporarily fixed to the inner peripheral surface of the outer cylindrical ring 11 in advance, and the diameter-reduced segment 14 is assembled by assembling the diameter-reduced segment 13 from above, thereby reducing the diameter-reduced ring 14. A second water stop seal 16 b may be interposed between the outer ring 11 and the outer cylinder ring 11.
[0021]
Further, in FIG. 4, a part 13 a of the reduced diameter segment 13 constituting the reduced diameter ring 14 is removed, and the start opening 1 of the branch shield machine 3 is opened in the reduced diameter tunnel 15. Then, it is not necessary to open the start opening 1. This is because when the start opening 1 is open, the rigidity against the reaction force of the digging is lowered when the propulsion jack 6 is pressed to advance the shield machine (shield frame 4). Therefore, as shown in FIG. 5, a number of reduced diameter segments 13 are further assembled to cause the shield machine (shield frame 4) to excavate to some extent, and the reaction force of the excavation by the propulsion jack 6 acts in a distributed manner at the start port 1. It is preferable not to open the start port 1 to the position.
[0022]
Thereafter, as shown in FIG. 5, a diameter-reducing ring 14 composed of the diameter-reduced segments 13 is further assembled in a predetermined number of axial directions, and the diameter-reduced tunnel 15 is extended. The extended length is such that when the outer cylinder hood 12 is moved forward along the reduced diameter tunnel 15 and the start opening 1 is exposed to the side ground, the outer cylinder hood 12 moving forward is placed on the outer periphery of the reduced diameter tunnel 15. It is set to a length that can be fitted. That is, the diameter-reduced tunnel 15 is set to be at least twice the length of the outer cylinder hood 12, and covers the start area 1 with the outer cylinder hood 12 and the start area 1 on the side. The storage area portion 15b accommodates the outer cylinder hood that has been moved forward when exposed to the natural ground.
[0023]
As shown in FIG. 5, when extending the reduced diameter tunnel 15, the wire 17 is attached to the wire attachment portion 18 prior to the extension. When the reduced diameter tunnel 15 is extended to a predetermined length, a special segment 19 having the same thickness as the standard segment 7 is assembled to the end of the reduced diameter tunnel 15. The special segment 19 includes a wire introduction port 20 formed in a portion projecting radially outward from the reduced-diameter segment 13, a wire discharge port 21 formed on the inner peripheral surface, a wire passage 22 communicating these, And a roller 23 provided in the deflection portion of the passage 22 to guide the wire 17 into the tunnel. The introduction port 20 is provided with a seal that stops water between the wire 17.
[0024]
Then, the standard segment 7 is assembled by connecting to the special segment 19, and the process returns to the normal excavation and segment assembly process. In each of the above steps, a filler (indicated by dots in the figure) is injected from the excavator side into the gap (tail void) between the outer peripheral surface of the tail frame 5 and the outer peripheral surfaces of the existing segments 7, 13, 19. The This filler prevents loosening of earth and sand in the space between the digging hole and the segment outer peripheral surface by the excavator, and mortar is basically used. In order to improve the slide of the outer cylinder hood 12, a material (oil-based material or the like) which is rich in lubricity and hardly hardens is used.
[0025]
Thereafter, as shown in FIG. 5, a start ring 24 into which the branch shield machine 3 is inserted is attached to the inside of the start port 1 by welding or the like. The start ring 24 may be attached at any time, not limited to the timing of FIG. 5, but is preferably after the tail frame 5 has been separated from the start port 1 without wrapping. In a state where the tail frame 5 is wrapped at the start opening 1, it may be difficult to attach the start ring 24 to the start opening 1 due to various devices of the main shield shield machine in the tail frame 5 being in the way. Because.
[0026]
Thereafter, as shown in FIG. 1, a part of the branch shield machine 3 is liquid-tightly attached to the start ring 24 of the start port 1. The attachment of a part of the branch shield machine 3 to the start ring 24 is not limited to the timing of FIG. 1, but may be any time, but after the tail frame 5 of the main line shield machine has separated from the start port 1 without wrapping. Is preferred. In the state where the tail frame 5 is wrapped at the start opening 1, even if it is possible to attach the start ring 24 to the start opening 1, attaching a part of the branch shield machine 3 to the start ring 24 is This is because various devices of the main line shield machine in the tail frame 5 are difficult to get in the way.
[0027]
A part of the branch shield machine 3 includes a guide ring 25 fixed to the start ring 24 by bolts, nuts, welding or the like, and a cylindrical front shield frame 26 slidably accommodated in the guide ring 25. And a partition wall 27 for partitioning the inside of the front shield frame 26, a cutter 28 attached to the partition wall 27, and a cutter motor 29 for driving the cutter 28. On the inner peripheral surface of the guide ring 25, seals 30 (brush-like) that stop the gap with the front shield frame 26 are provided along the circumferential direction in two front and rear stages. A sealant is filled from the filling port 31 between the seals 30 of each stage.
[0028]
Thus, if the guide ring 25 of the branch shield machine 3 is liquid-tightly attached to the start ring 24 of the start port 1, the latter half portion (not shown) of the branch shield machine 3 is assembled in the tunnel, and the wire 17 is The outer cylinder hood 12 covering the start opening 1 by the cover area 15a of the reduced diameter tunnel 15 is moved to the front storage area 15b by pulling from the tunnel with the winch 32 or the like, and the start opening 1 is moved to the side ground. Expose to the mountains. In the present embodiment, the special segment 19, the winch 32, and the like constitute the traction mechanism 33 in claim 3, and the traction mechanism 33 and the wire 17 constitute the slide means 34.
[0029]
In this way, when the start opening 1 is exposed to the side ground, the earth and sand and water of the side ground are separated by the partition 27 of the branch shield machine 3 and the seal 30 between the guide ring 25 and the front shield frame 26. Since the earth is retained and the water is stopped, there is no intrusion into the tunnel. Thereafter, the branch shield machine 3 is started from the start port 1, and a branch tunnel is constructed behind the branch shield machine. Water stoppage in the gap between the starting branch shield machine 3 and the start port 1 is held by a seal 30 provided on the inner peripheral surface of the guide ring 25.
[0030]
According to this embodiment, it is possible to construct the branch shield start port 1 on the side of the tunnel without any modification on the shield machine side, that is, without providing an expansion / contraction mechanism or the like on the tail. Therefore, it is possible to avoid the problem that the tail portion once expanded is bent inward by the side earth pressure and difficult to be contracted again, and an increase in manufacturing cost of the shield machine itself can be avoided.
[0031]
In addition, according to the present embodiment, a plurality of start ports 1 can be easily formed by repeating the work of assembling each component in the procedure shown in FIGS. In addition, since the start opening 1 of the reduced diameter tunnel 15 is covered by the outer cylinder hood 12, the timing at which the start ring 24 and a part of the branch shield machine 3 are attached to the start opening 1 can be freely set, and the start opening The timing at which 1 is exposed to the side ground can also be set freely. Therefore, the degree of freedom of construction is expanded.
[0032]
That is, in the prior art, in order to avoid inundation from the starting port, the tail portion is temporarily expanded and a segment in which the starting port is formed is assembled on the inside thereof, and a part of the branch shield machine is installed at the starting port. It is necessary to install liquid-tightly, and in that case, it is possible that various equipment of the main shield shield machine inside the tail part interferes with the installation of the branch shield machine, but in this embodiment For example, as shown in FIG. 1, when the start port 1 is sufficiently separated from the tail frame 5, a part of the start ring 24 and the branch shield machine 3 can be attached to the start port 1. A part of the installation work space of the shield machine 3 can be secured in the reduced diameter tunnel 15.
[0033]
Another embodiment of the present invention is shown in FIG.
[0034]
As shown in the figure, the basic configuration of this embodiment is the same as that of the previous embodiment shown in FIG. 1. Therefore, the same parts are denoted by the same reference numerals, and the description thereof is omitted. Only the “sliding means for sliding 12 in the axial direction” will be described. The slide means 34 in this embodiment is accommodated in a special segment 35 assembled in the standard tunnel 9 in place of the wire attachment portion 18, the wire 17, the special segment 19 and the winch 32 in the previous embodiment shown in FIG. The jack 36 is provided, and a joint rod 37 to be added when the jack 36 is contracted is provided.
[0035]
According to this configuration, after a part of the branch shield machine 3 is liquid-tightly attached to the start ring 24 of the start port 1, the jack 36 is extended from the state shown in FIG. The outer hood 12 is advanced until the start opening 1 is exposed to the side ground by repeating the operation of contracting the jack 36, inserting the extension rod 37 into the empty space, and extending the jack 36 again. Let A plurality of special segments 35 and jacks 36 are provided at predetermined intervals in the circumferential direction of the tunnel. Even in this embodiment, the same effect as the previous embodiment is obtained.
[0036]
【The invention's effect】
As described above, according to the construction method and the construction structure of the branch shield excavator according to the present invention, the branch shield excavation can be performed on the side of the tunnel without any modification of the expansion tail mechanism or the like. You can build a launching port for the machine.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a structure for constructing a launch opening of a branch shield machine according to an embodiment of the present invention.
FIG. 2 is a side view of a structure for constructing a launch opening of the branch shield machine.
FIG. 3 is a process diagram showing a method of constructing a start port of the branch shield machine.
FIG. 4 is a process diagram illustrating a continuation of FIG. 3;
FIG. 5 is a process diagram illustrating a continuation of FIG. 4;
FIG. 6 is a cross-sectional plan view of a construction for starting a branch shield machine according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Start port 3 Branch shield machine 5 Tail frame 7 Standard segment 8 Tail seal 10 Arc plate 11 Outer ring 12 Outer ring hood 13 Reduced diameter segment 14 Reduced diameter ring 15 Reduced diameter tunnel 16a First water stop seal 16b Second stop Water seal 17 Wire 33 Pulling mechanism 34 Slide means

Claims (3)

This is a method for constructing a branch shield machine launcher at the side of a tunnel constructed with a shield machine, and by connecting circular plates in the circumferential direction within the tail frame of the shield machine, an outer ring is constructed. In addition, a reduced diameter ring is constructed by connecting a reduced diameter segment whose outer diameter is smaller than that of the standard segment in the circumferential direction inside the outer cylinder ring, and along the circumferential direction between the reduced diameter ring and the outer cylinder ring. Install the first water stop seal, move the shield machine forward by about one ring, press the tail seal at the rear end of the tail frame against the outer surface of the outer cylinder ring, and seal it in that state. A new outer cylinder ring is constructed in the same procedure by connecting it in the axial direction of the outer cylinder ring, and the new reduced diameter ring is connected by connecting it in the axial direction of the previous reduced diameter ring inside the new outer cylinder ring. Build in steps, then work Repeatedly constructs a reduced diameter tunnel in which the reduced diameter ring is connected in the axial direction, and slidably builds an outer cylinder hood in which the outer cylinder ring is connected in the axial direction on the outside, and the reduced diameter tunnel and the outer cylinder hood A second water stop seal is installed along the circumferential direction between the first and second water stop seals covered by the outer cylinder hood. A branch shield excavator formed by penetrating and mounting a part of the branch shield excavator at the start opening, and then sliding the outer hood to expose the start opening to the side ground. How to build a starting point for your car. It is a construction structure of a launch opening formed to start a branch shield machine on the side of a tunnel constructed with a shield machine, and has a length that can be assembled in the tail frame of the shield machine and outside. A reduced-diameter tunnel constructed by connecting reduced-diameter segments smaller in diameter than the standard segment in the circumferential direction and the axial direction, and slidably fitted outside the reduced-diameter tunnel, and can be assembled in the tail frame of a shield machine An outer cylinder hood formed by connecting circular arc plates of various lengths in the circumferential direction and the axial direction, and a predetermined interval in the axial direction between the inner surface of the outer cylinder hood and the outer surface of the inner diameter reduction tunnel. The first and second seals interposed along the circumferential direction, and the branch shield excavation formed through a part of the reduced diameter tunnel covered with the outer cylinder hood between the first and second water stop seals Origin of the machine Mouth and, building structures of the starting opening of the branch shield machine is characterized in that a sliding means for sliding the outer cylinder hood axially to expose the start port on the side natural ground. The slide means includes a wire connected to an end portion of the outer cylinder hood, and a traction mechanism that pulls the wire into the tunnel after pulling the wire along the outer surface of the reduced diameter tunnel for a predetermined length. 2. Construction structure of the start of the branch shield machine according to 2.

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