JP5826564B2 - Reinforcing existing segment - Google Patents

Description

  The present invention relates to a method for reinforcing an existing segment constituting an existing tunnel.

A method of reinforcing an existing segment by providing a lining body on the inner surface of an existing segment that forms the inner wall surface of an aging existing tunnel is known (see, for example, Patent Document 1).
The lining body consists of an interior panel installed so as to face the inner surface of the existing segment, a reinforcing bar arranged between the inner surface of the existing segment and the inner panel, and an inner surface of the existing segment and the inner panel. And concrete filled in.
As the interior panel, a precast concrete plate, an FRP plate, a lightweight panel made of a fiber reinforced material, or the like is used.

JP 2001-271599 A

Conventionally, as described above, the installation work of the interior panel, the bar arrangement work, and the concrete filling work are required, and thus there are problems in terms of workability, construction time, construction cost, and the like.
The present invention provides a method for reinforcing an existing segment that can easily and inexpensively reinforce an existing segment.

A method for reinforcing an existing segment according to the present invention is a method for reinforcing an existing segment in which a reinforcing member is sprayed on the inner surface of an existing segment of an existing shield tunnel to form a segment reinforcing portion, and is provided so as to rise from the inner surface of the existing segment. When the reinforcing material is sprayed into the bottomed box part of the one-end opening surrounded by the formed plate, a reinforcing material dropout prevention tool is provided to prevent the reinforcing material sprayed into the bottomed box part from falling off. Since it is installed so as to stretch against a pair of walls facing each other, the existing segment can be reinforced easily and inexpensively, and the reinforcing material adheres to the reinforcing material falling-off prevention tool, and the reinforcing material sprayed into the bottomed box part is removed. Since it can prevent, a favorable segment reinforcement part can be formed.

Sectional drawing of the existing segment reinforced (Embodiment 1). Sectional drawing of the existing segment reinforced (Embodiment 2). The perspective view which shows the reinforcing material drop-off prevention tool (Embodiment 2). Sectional drawing which shows the spraying process of a reinforcing material (Embodiment 3). The perspective view which shows the spraying process of a reinforcing material (Embodiment 3). Sectional drawing which shows the construction method of a shield tunnel (embodiment 1 thru | or 3). A perspective view showing a segment piece (embodiments 1 to 3).

Embodiment 1
As shown in FIG. 6, the shield tunnel is concentric with the cylindrical cavity inside the cylindrical cavity (tunnel cavity) formed by excavating the natural ground 52 by the cutter head 51 of the shield machine 50. A cylindrical segment 53 is constructed as a primary lining.
That is, a plurality of arc-shaped segment pieces 54 are installed so as to extend in the circumferential direction of the cylindrical cavity in a cylindrical cavity formed 50 behind the shield machine, and the annular segment ring 55 is assembled. The piston rod 61 of 50 propulsion jacks 60 is brought into contact with the front surface 56 of the annular segment ring 55 and the piston rod 61 of the propulsion jack 60 is extended to use the annular segment ring 55 as a reaction force receiver. To push forward. Then, the piston rod 61 of the propulsion jack 60 is contracted to assemble a new annular segment ring 55 connected to the annular segment ring 55 in front of the annular segment ring 55. Thus, while the shield machine 50 is propelled forward, the annular segment rings 55 are assembled in order behind the shield machine 50, and the annular segment rings 55; 55 adjacent to each other are connected to each other. A cylindrical segment 53 is constructed by a plurality of annular segment rings 55;
As shown in FIG. 7, the segment piece 54 includes a substrate 70 having an arc-shaped inner surface 71 and an arc-shaped outer surface 72, a ring joint plate 73, a segment joint plate 74, and a reinforcing rib 75. The ring joint plate 73, the segment joint plate 74, and the reinforcing rib 75 are provided on the inner surface 71 side of the substrate 70. The ring joint plate 73 is formed so as to rise from the straight edges 76; 76 at opposite ends of the substrate 70. The segment joint plate 74 is formed to rise from arcuate edges 77; 77 at opposite ends of the substrate 70. The reinforcing rib 75 is provided so as to extend across one segment joint plate 74 and the other segment joint plate 74 facing each other.
Accordingly, a plurality of bottomed box portions (hereinafter referred to as cores 76) having one end openings are formed on the inner surface 71 side of the substrate 70.
The core 76 includes a pair of segment joint plates 74; 74, a ring joint plate 73, a reinforcing rib 75, and a substrate 70 surrounded by a bottomed box portion, or a pair of opposing segment joints. It is formed by a bottomed box portion having one end opening surrounded by a pair of reinforcing ribs 75 and the substrate 70 facing the plate 74. That is, the core 76 is formed by a bottomed box portion having one end opening surrounded by a plate provided so as to rise from the inner surface 71 of the existing segment 53.
The ring joint plate 73 is provided with a hole 78 through which a bolt for connecting the segment pieces 54; 54 adjacent to each other in the circumferential direction of the cylindrical cavity is passed. The segment joint plate 74 is provided with a hole 79 through which a bolt for connecting the segment pieces 54; 54 adjacent to each other in the propulsion direction of the shield excavator is passed.

  In the first embodiment, as shown in FIG. 1, in the existing segment 53 forming the tunnel 1, the mortar 2 as an example of the reinforcing material is provided in the core 56 of the segment piece 54, that is, on the inner surface 71 of the existing segment 53. The segment reinforcement part 3 was formed by spraying.

The spraying device 3 for spraying the mortar 2 includes a mixer 4 for kneading the material to make the mortar 2, a mortar charging hopper 5, a pump 6, an injection device 7, a discharge port of the pump 6, and an injection device 7. A hose (connecting pipe) 8 that connects the mortar receptacle so as to communicate with each other is provided.
The mortar 2 created by the mixer 4 and charged into the mortar charging hopper 5 is pumped by the pump 6 to the spraying device 7 via the hose 8 and sprayed from the spray nozzle 9 of the spraying device 7.

  According to the first embodiment, the mortar 2 is sprayed into the core 56 of each segment piece 54 of the existing segment 53 that forms the tunnel 1 to form the reinforcing layer 3. The existing segment 53 can be reinforced easily and inexpensively compared to a reinforcing method that requires a bar arrangement work and a concrete filling work.

Embodiment 2
In order to prevent buckling of the existing segment 53, the segment reinforcing layer 3 is formed by spraying the mortar 2 into the core 56 of the segment piece 54 positioned on the left and right wall portions of the existing segment 53 forming the shield tunnel 1.
For example, as shown in FIG. 2, the existing segment 53 of the shield tunnel 1 that forms a common wire groove (CCBOX) for collectively accommodating various cables 10 such as a power line, a telephone line, and a communication line in the ground, a power line Each segment located in the left and right wall portions 53A and 53B of the existing segment 53 in an existing segment of a shield tunnel that forms a common groove (not shown) that collectively accommodates telephone lines, communication cables, gas pipes, water and sewage pipes, etc. By blowing the mortar 2 into the core 56 of the piece 54 to form the segment reinforcing layer 3, it is possible to prevent buckling of the existing segment 53.
For example, as shown in FIG. 2, a rack 12 to which an installation plate 11 such as various cables 10 is fixed is installed on the left and right wall portions 53 </ b>A; 53 </ b> B side of the existing segment 53 of the electric wire joint groove. And the wall portion 53A and between the rack 12 and the wall portion 53B are often narrow spaces 20. Although it is difficult for an operator to enter such a narrow space 20 and perform interior panel installation work, bar arrangement work, and concrete filling work as in the prior art, according to the second embodiment, the existing segment 53 Since the mortar 2 as the reinforcing material only needs to be sprayed into the core 56 of each segment piece 54 located on the left and right wall portions 53A and 53B, the existing segment 53 can be reinforced easily and inexpensively. Can be prevented from buckling.

Embodiment 3
In the case of the existing segment 53 in which the concrete segment piece 54 is used in the method of forming the reinforcing layer 3 by spraying the mortar 2 into the core 56 of the segment piece 54 as in the first and second embodiments, The mortar 2 adheres in the core 56 of the segment piece. In the case of the existing segment 53 using a metal segment piece 54 such as ductile (cast iron) or steel (steel), the segment piece 54 The mortar 2 is difficult to adhere, and the mortar 2 easily falls off from the core 56 of the segment piece 54.
Therefore, in the third embodiment, in the case of the existing segment 53 in which a metal segment piece 54 such as a ductile or steel is used, the mortar drop prevention tool (reinforcing material drop prevention tool) 25 is provided in the core 56. Installed to prevent the mortar 2 from falling off.

As the mortar drop prevention tool 25, for example, as shown in FIG. 3, a barrel portion 28 having a right screw portion 26 at one end and a left screw portion 27 at the other end, and a right screw portion of the barrel portion 28. A so-called turnbuckle including one rod body 30 having a threaded portion 29 inserted into 26 and the other rod body 32 having a threaded portion 31 inserted into the left threaded portion 27 of the body portion 28 is used. .
As shown in FIG. 5 (b), the mortar dropout prevention device 25 constituted by the turnbuckle is operated by operating the body portion 28 so that one rod body 30 and the other rod body 32 move away from each other. The one end face 30a of one rod body 30 and the inner surface of one segment joint plate 74 are brought into contact with each other, and the one end face 32a of the other rod body 32 and the inner surface of the other segment joint plate 74 are brought into contact with each other. The rod body 30 and the other rod body 32 are installed so as to stretch between a pair of segment joint plates 74; 74 facing each other.

A spraying method in the case of using the mortar dropout prevention tool 25 of Embodiment 3 will be described with reference to FIGS. 4 and 5. FIG. 5 shows a spraying method by extracting only one segment piece 54 of the existing segments 53.
First, the mortar 2 is sprayed on the inner surface 71 of the substrate 70 in the core 56 of the segment piece 54 of the existing segment 53 to form the first reinforcing layer 35 having a thickness of about 10 mm to 20 mm from the inner surface 71 (FIG. 4A ); See FIG. 5 (a)). After confirming the hardening of the first reinforcing layer 35 (for example, after curing for 480 minutes), the mortar drop-off prevention device 25 is disposed inside the core 56 and outside the first reinforcing layer 35 as described above. And installed between 74 (see FIG. 4B; FIG. 5B). A second reinforcing layer 36 having a thickness of about 50 mm is formed on the first reinforcing layer 35 so as to fill the mortar dropout prevention tool 25 (see FIG. 4C; FIG. 5C). After confirming the hardening of the second reinforcing layer 36 (for example, after curing for 120 minutes), a third reinforcing layer 37 having a thickness of about 50 mm is formed on the second reinforcing layer 36 (FIG. 4D); (See (d)). That is, after the mortar 2 of the previous layer was cured, the mortar 2 forming the next layer was sprayed on the previous layer to form the three reinforcing layers 35; 36; 37 composed of the three mortar layers.
In addition, in order to improve the filling property of the mortar 2, the spraying order was sprayed from the corner of the core 56, and finally the center of the core 56 was sprayed.

According to the third embodiment, since the mortar drop prevention tool 25 is installed in the core 56 to form the reinforcing layers 35; 36; 37, the mortar 2 adheres to the mortar drop prevention tool 25 and enters the core 56. Since it is possible to prevent the sprayed mortar 2 from falling off, a good segment reinforcing portion 3 can be formed.
Further, since the segment reinforcing portion 3 is formed by the three layers of reinforcing layers 35; 36; 37, the filling property of the mortar 2 in the core 56 is improved, and the segment reinforcing portion 3 having few cavities can be formed.

In addition, as the mortar fall-off prevention tool 25, what is installed so that it may stretch on a pair of mutually opposing wall of the core 56 should just be used.
The present invention can also be applied to reinforcement of existing segments that form shield tunnels such as subways and roads other than the above-described common wire grooves and common grooves.

1 shield tunnel, 2 mortar (reinforcement material), 3 segment reinforcement,
25 Mortar dropout prevention equipment (reinforcing material fallout prevention equipment), 53 Existing segment,
56 Core (bottomed box), 71 Inner surface of existing segment,
74; 74 A pair of segment joint plates (a pair of walls).

Claims (1)

A method of reinforcing an existing segment in which a reinforcing member is sprayed on the inner surface of an existing segment of an existing shield tunnel to form a segment reinforcement portion ,
When the reinforcing material is sprayed into the bottomed box part of the one-end opening surrounded by the plate provided so as to rise from the inner surface of the existing segment, the reinforcing material dropout is to prevent the reinforcing material sprayed into the bottomed box part from falling off. A reinforcing method for an existing segment, wherein the preventer is installed so as to stretch against a pair of opposing walls of the bottomed box portion .

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