JP3850532B2 - How to back up the segment ring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for backfilling a space between a natural ground and a lining constructed inside the natural ground in a tunnel excavated by a shield method.
[0002]
[Prior art]
In the conventional shield method, a tunnel excavator called a shield machine is propelled into the ground to prevent the collapse of earth and sand, and a segment is constructed by assembling a segment of concrete, steel, cast iron or a combination of these inside the excavated hole. A lining is formed by constructing a ring and arranging a number of segment rings along the length of the tunnel.
[0003]
The lining has a role of receiving a reaction force for propelling the shield machine main body and also has a role as a support work during tunnel construction. Further, it also has a role as a permanent lining structure by itself or in combination with a secondary lining material.
[0004]
Therefore, in order to stabilize the lining and prevent the skin of the ground from falling and to prevent the ground from loosening and causing land subsidence, press the backfill material into the space between the lining and the ground and harden it. , Things are backed up.
[0005]
As a method of backfilling, the backfilling material is injected directly between the lining and the ground, and the backfilling is performed. In this method, the backfilling material goes around the front of the shield machine. This has an adverse effect on the cutter head and the conveyor for transporting earth and sand, causing troubles in excavation work.
[0006]
Therefore, in recent years, in the segment ring at predetermined intervals in the lining, a cloth bag body is disposed in each segment constituting the segment ring, the backfill material is press-fitted into the bag body, and the moisture of the backfill material is transferred to the bag body. Squeeze out through the fabric to cure the backfill material inside the bag to form a dense ring-shaped backfill on the outside of the segment ring, and backfill the space partitioned by the ring-shaped backfill. The material is pressed in and backed up.
[0007]
Thus, in the conventional backfilling method of this type, a bag is previously mounted on the outer surface of each segment, the segments are assembled to construct a segment ring, and then the backfill material is placed on the bag. Had been press-fitted.
[0008]
[Problems to be solved by the invention]
However, in this method, it is necessary to attach a bag body in advance to each segment constituting the segment ring, and after constructing the lining, the back-filling material is individually applied to the bag body attached to each segment. The operation to press-fit must be performed, and the operation is extremely complicated.
[0009]
In addition, since the bag bodies attached to the adjacent segments in the segment ring are separate from each other, even when they are inflated with the backfill material and butted against each other, the gap between the butted portion and the ground or segment There is a possibility that a gap is generated, and the backfilling material may flow to the front of the shield machine through the gap as described above when the backfilling material is pressed into a portion other than the bag.
[0010]
The present invention has been made in view of such circumstances, and between the constructed segment ring and the natural ground is backed in a ring shape by a simple operation, and the inflow of the backfilling material to the front of the shield machine is ensured. The purpose is to prevent.
[0011]
[Means for Solving the Problems]
Thus, according to the backfilling method of the present invention, a plurality of segments are assembled into a ring shape, a segment ring is constructed along the inside of the tunnel ground, and it is folded flat between the ground outside the segment ring. A folded bag is mounted, and the segment ring is made a round with a bag having a smaller number of segments than the segment ring. It is characterized by being pressed.
[0012]
In the present invention, it is preferable that at least one operation window is formed on the substrate in the segment, and the bag body is attached and the backfill material is pressed into the bag body from the operation window.
[0013]
Moreover, in this invention, it is preferable to mount | wear with the outer side of the board | substrate of the said segment so that the terminal of an adjacent bag body may mutually overlap.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The drawings show one embodiment of the present invention. 1 and 2 show a tunnel in which a lining 9 is constructed, and a segment ring 3 is formed by combining a plurality of segments 2 inside a natural ground 1 excavated by a shield excavator (not shown). The lining 9 is constructed by forming a large number of the segment rings 3 in the tunnel length direction.
[0015]
FIG. 1 is a cross-sectional view of a tunnel, and a segment ring 3 is formed by combining six segments 2a to 2f. Each segment 2 has a shape curved along the inner periphery of the tunnel, and has a substantially H-shape composed of a substrate 4a and side walls 4b formed on both sides thereof. In the two segments 2a and 2d facing each other, operation windows 5a and 5b are formed on the substrate 4a, respectively.
[0016]
Thus, in the present invention, every several segment rings 3 among the many segment rings 3 constituting the lining 9 are backed up between the segment rings 3 and the ground 1. Although there is no particular structural difference between the segment ring 3 to be backfilled and the segment ring 3 to be backfilled, the operation window 5 is preferably provided only in the segment ring 3 to be backfilled.
[0017]
3 and 4 show a method of forming a backfill between the natural ground 1 and the segment ring 3 using the segment 2, and (a) in FIG. A state in which the segment ring 3 is formed by combining the segments 2 is shown.
[0018]
Thus, first, as shown in FIG. 4 (b), the guide line 6 is inserted into the space between the segment ring 3 and the natural ground 1 from one operation window 5 a, and the guide line 6 is inserted into the segment ring 3. The segment ring 3 is made to make a half turn along the outer side and pulled out from the other operation window 5b.
[0019]
4C, the terminal of the bag body 7 is connected to the terminal of the guide cable 6 protruding from the operation window 5b, and the bag body 7 is pulled from the other end of the guide cable 6 so that the bag body 7 is connected to the segment ring 3 and the ground. It draws in the space between the mountains 1 and, as shown in FIG. 4 (d), makes the segment ring 3 a half turn and pulls it out from the one operation window 5a.
[0020]
Further, similarly, as shown in FIG. 4 (e), the guide cable 6 is inserted by half-turning the inside from one operation window 5a to the other operation window 5b in the opposite direction, and the bag body is inserted into one end thereof. 7 is connected to the other end. Then, the guide wire 6 is pulled in the same manner as before, and the bag body 7 is pulled into the empty space in the opposite direction, and as a result, as shown in FIG. Let them wear.
[0021]
The guide rope 6 used in this process is pushed from the rear to advance the void, so that an excessively soft one is not preferable, and a leaf spring or the like has a suitable rigidity while having flexibility. Is preferably used.
[0022]
The bag body 7 is formed by woven fibers into a cylindrical shape. When the bag body 7 is expanded, it fills the space between the substrate 4a of the segment 2 and the natural ground 1 and is strongly pressed against the natural ground 1. It is necessary to have a diameter.
[0023]
Then, the bag body 7 is folded flat, and further folded in the width direction as shown in FIG. 3 (a) so as to be accommodated between the side walls 4b of the segment 2, and this is emptied as described above. Pull into the place.
[0024]
In the above-described method, the bag body 7 is attached to the outer side of the segment ring 3 by dividing the outer periphery of the segment ring 3 into two half-cycles. It is also possible to draw 7 around at once. It is also possible to pull it in at least three times.
[0025]
Next, a backfilling material inlet 8 is attached to one end of the bag body 7 attached to the segment ring 3, and the backfilling material inlet 8 is protruded inward from the operation window 5a. This state is shown in FIG.
[0026]
At this time, it is preferable that the length of the bag body 7 is slightly longer than the circumferential length of the segment ring 3 so that both ends of the bag body 7 are in close pressure contact when the bag body 7 is expanded. Moreover, as shown in FIG. 6, it is preferable to mount | wear so that the both ends of the bag body 7 may mutually overlap. By providing the backfilling material inlets 8 at both ends of the bag body 7 and fixing them to the segment 2, the overlapping state can be maintained, and the sealing performance between the segment ring 3 and the natural ground 1 can be improved. it can.
[0027]
Further, the backfilling material inlet 8 has been described as being attached after the bag body 7 is attached to the segment ring 3, but the present invention is not limited to this, and it may be attached before or during attachment depending on the construction situation. There is no problem.
[0028]
In this state, when the backfilling material is press-fitted into the bag body 7 from the backfilling material inlet 8, the bag body 7 expands and is pressed against the ground 1 as shown in FIG. At this time, the moisture of the backfilling material oozes through the wall surface of the bag body 7, the backfilling material is concentrated in the bag body 7, and a strong backfilling is formed by curing this.
[0029]
After the backfill material is press-fitted into the bag body 7 and cured to back the outside of the segment ring 3 to which the bag body 7 is attached, the segment ring 3 between the bag body 7 and the ground 1 The inside space is also filled with a backfill material, which is cured and backfilled over the entire lining 9.
[0030]
In the above description, the bag body 7 is mounted at predetermined intervals of the segment ring 3 and the present invention is applied, and the segment ring 3 between the bag bodies 7 is between the segment ring 3 and the ground 1. Although only the backfill material is filled, the present invention is not limited to this structure, and the bag body 7 can be attached to all the segment rings 3 constituting the lining 9 and backfilling can be performed according to the present invention. Further, at this time, back-filling in the space between the segment rings 3 is not always necessary.
[0031]
In the above description, the bag body 7 has been described so that the single bag body 7 is mounted over the entire circumference of the segment ring 3, but this need not necessarily be a single bag body 7. Alternatively, a plurality of bag bodies 7 can be mounted for each small section, the ends of the bag bodies can be brought into contact with each other, and the segment ring 3 can be made to make one round with the entire bag bodies 7.
[0032]
For example, in FIG. 4, separate bag bodies 7 are attached to the right half and the left half from the operation window 5a formed on the upper and lower sides of the segment ring 3 to the operation window 5b. Match. And about each bag body 7, a backfilling material is inject | poured from the backfilling material injection port 8 formed in the one end or both ends.
[0033]
In this case, if the bag body 7 is divided into a number that is too small, the present invention does not make sense and should be less than the number of segments 2 constituting the segment ring 3. 7 is preferably mounted over at least 2 to 3 or more segments 2. Moreover, as shown in FIG. 6, it is preferable to attach the butting | matching part of the both ends of the adjacent bag body 7 so that the terminal of the adjacent bag body 7 may mutually overlap.
[0034]
In the above description, the segment 2 has a substantially H-shaped cross section, and the bag 7 is described as being installed between the side plates 4b. A side plate 4b is preferably formed on the segment 2 as a guide for inserting the guide cable 6 and installing the bag body 7 at a predetermined position. However, the side plate 4b is not always necessary, and the segment 2 is simply Even a cylindrical surface may be used.
[0035]
When excavating a tunnel, it is excavated with a sufficient margin so as not to obstruct the lining formed by the segment 2 on the inside, so even if the outer surface of the segment 2 is a simple cylindrical surface, A space sufficient to install the body 7 is formed.
[0036]
Further, as shown in FIG. 7, a step is provided between the adjacent segment rings 3 and the bag body 7 is installed in the segment ring 3 whose outer side is depressed. It is also possible to use as a guide for inserting the bag body 7 and installing the bag body 7.
[0037]
[Effects of the invention]
According to the present invention, a series of bag bodies 7 are attached to the segment ring 3 formed by the segments 2 over the entire circumference, and the backfill material is press-fitted into the bag bodies 7, so that a large number of segments can be formed. There is no need to attach a separate bag body, and the press-fitting operation of the backfilling material into the bag body can be performed once or several times, and the backfilling operation is simple.
[0038]
And since the backfilling material press-fitted into the bag body 7 is squeezed out of the bag body 7 and concentrated, and in this state, it is hardened with sufficient pressure, so the segment ring 3 and the natural ground 1 Between these, the bag body 7 filled with the dense backfill material is fitted, and the segment is stabilized at an early stage.
[0039]
Therefore, when the backfilling material is pressed into the space between the lining 9 and the ground 1 between the segment rings 3 and between the lining 9 and the ground 1, the backfilling material is shielded by the bag 7. It does not become an obstacle to excavation by flowing in front of the shield machine, and the backfill material is hardened precisely in the closed space, so that the space between the lining 9 and the natural ground 1 is firmly backed up as a whole tunnel. Is done.
[0040]
Further, in the present invention, by making the integral bag body 7 go around the segment ring 3, there is only one butted portion of the bag body 7, and there is little possibility that the backfill material leaks through the butted portion. Further, since the bag body 7 is integrated over the entire circumference, the pressure of the back-filling material that is press-fitted into the bag body 7 is uniform over the whole, and no uneven force is applied to the segment ring 3. Even when the bag body 7 is divided into a plurality of parts, the number of butted portions is small, and the pressure adjustment of each bag body 7 is easy.
[0041]
In general, when drilling a tunnel hole with a shield machine, the inner diameter of the tunnel hole is not necessarily strictly constant. When a segment ring is constructed inside the ground, it is formed outside the segment ring. The excavations that are done vary partially in size. At this time, according to the present invention, after constructing the segment ring, it is possible to use a bag body having a required size in accordance with the size of the outer excavation outside the segment ring. By filling the backfill material, the segment ring and the ground can be more firmly stabilized.
[Brief description of the drawings]
1 is a cross-sectional view of a tunnel in which a segment ring composed of segments according to the present invention is constructed. FIG. 2 is a vertical cross-sectional view of a part of the tunnel of FIG. 1. FIG. It is an enlarged view of the principal part in the state which mounted | wore, (a) is the state which mounted | wore the folded bag body 7, (b) shows the state which press-fitted the backfill material in the bag body 7. FIG.
4 is a cross-sectional view of a tunnel showing a step of attaching the bag body 7 to the segment ring 3 in the present invention. FIG. 5 is a cross-sectional view of the tunnel showing a step of press-fitting backfill material into the bag body 7 in the present invention. FIG. 6 is a front view showing an example of a butt portion of an adjacent bag body. FIG. 7 is a longitudinal sectional view of a part of a tunnel showing another example of a segment.
DESCRIPTION OF SYMBOLS 1 Ground mountain 2 Segment 3 Segment ring 4a Substrate 4b Side wall 5 Operation window 7 Bag

Claims (3)

A plurality of segments (2) are assembled in a ring shape to construct a segment ring (3) along the inside of the tunnel ground (1), and between the ground (1) outside the segment ring (3) The bag body (7) folded flat is attached to the segment ring (3), and the segment ring (3) is made to wrap around the bag body (7) less than the number of segments (2) constituting the segment ring (3). A method for backfilling a segment ring, characterized in that a backfilling material is press-fitted into a body (7) and expanded, and the bag (7) is pressed against a natural ground (1). At least one operation window (5) is formed on the substrate (4a) in the segment (2), and the bag body (7) is attached and backed into the bag body (7) from the operation window (5). The method of backfilling a segment ring according to claim 1, wherein the material is press-fitted 2. The segment back-filling method according to claim 1, wherein the ends of the adjacent bag bodies (7) are mounted so as to overlap each other outside the substrate (4 a) of the segment (2).

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