JPS63181893A - Reinforcing iron plate for tunnel lining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention provides a tunnel lining suitable for use when constructing a tunnel lining excavated by a shield excavator with cast-in-place concrete. Concerning reinforcing steel plates.

(b) 8 Problems to be Solved by the Invention Normally, when constructing a tunnel lining using cast-in-place concrete, formwork is first placed over a predetermined distance from the end face of the lining that was previously cast. Use to form a cylindrical concrete 1 to pouring amount,
It will be constructed by pouring concrete into it. At this time, a cylindrical reinforcing iron plate with many holes bored on its outer circumferential surface is installed as a concrete reinforcing member in the concrete pouring space. Gables are installed to prevent concrete poured into the space from flowing outside.

However, if the stopper is placed in a hole drilled in the reinforcing iron plate, there is a risk that water will leak through the hole, and some kind of countermeasure has been desired.

In view of the above circumstances, an object of the present invention is to provide a reinforcing iron plate for tunnel lining that can effectively prevent water leakage from the end stop portion.

(C) Means for solving the interlayer point, that is, the present invention has a main body (12A) formed in a cylindrical shape, and a predetermined distance (L2) from the end face (12a) to the main body (12A). A non-perforated area (ARA) is formed in the range of , and a main body portion (12
A) has a plurality of holes (12c) drilled through it, and a ring-shaped end stop (22) is further provided in the main body (12A) within the non-hole area (ARA). .

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r (d) below
The same applies to the column ``, action''.

(891 Effect) With the above-described configuration, the present invention provides an end stop (22) provided in the non-perforated area (ARA) and the end stop (22) provided in the non-perforated area (ARA).
acts to form a long aqueduct.

(e), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a diagram showing a construction site of a tunnel lining in which the reinforcing iron plate for tunnel lining according to the present invention is used, Fig. 2 is a cross-sectional view taken along line II-n in Fig. 1, and Fig. 3 is a diagram showing the construction site of a tunnel lining in which the reinforcing iron plate for tunnel lining according to the present invention is used. m-FIT
4 is an enlarged view of the jacking part of the shield excavator, and FIG. 5 is a sectional view taken along line ■-v in FIG. 4.

FIG. 6 to FIG. 13 are process diagrams showing how a tunnel lining is constructed using reinforcing iron plates for tunnel lining.

FIG. 14 is a perspective view showing an embodiment of a reinforcing iron plate for tunnel lining according to the present invention.

The shield excavator 1 is as shown in FIG.

It has a cylindrical outer shell 222, and a cutter 3 is rotatably supported on the front surface of the outer shell 2, that is, the left side surface in FIG. The cutter 3 is connected to a drive motor 5 provided on a partition wall 2a of the outer shell 2, which is provided to block the space inside the outer shell 2 in the left-right direction. A plurality of pieces, as shown in FIGS. 1 and 2,
They are arranged in a circular ring along the outer shell 2. A ram 6a is provided on the digging lever 6 so as to be able to protrude and retreat in the directions of arrows A and B, and further inside the outer shell 2, a ram 6a is provided.
A cylindrical press ring 7 is provided in contact with the inner surface of the one-monme shell 2 and is slidable in the directions of arrows A and B.

As shown in FIG. 2, the press ring 7 has a plurality of press ring jacks 9 arranged at predetermined intervals along the outer shell 2, and furthermore, the press ring jacks 9 are arranged at predetermined intervals along the outer shell 2. As shown in FIG. 2 and FIG. It is set in. Concrete 1-Discharge pipe 10
A cylinder 10b for cleaning the discharge pipe is provided with a rod 10C that can protrude and retreat in the directions of arrows C and D, and a concrete supply hose 30 is connected to the discharge pipe 1o.

By the way, a gauge ring 11 formed in an annular shape is attached to the tip of the ram 6a of the digging jack 6, and a retaining groove Lla is formed in the gauge ring 11, as shown in Fig. 54. It is perforated in an annular shape around the entire circumference of the ll. Further, on the right side of the gauge link 11 in the figure, a reinforcing iron plate 12 for tunnel lining is assembled and installed.The reinforcing iron plate 12 has a cylindrical main body 12A as shown in FIG. As shown in FIG. 4, the face-side end surface 12a of the water body 12A is fitted into the engagement groove 11a. In addition, in the main body 12A, there is a hole-free area ARA in which holes 12c for concrete distribution, which will be described later, are not drilled.
They are formed in an annular shape mutually over a predetermined distance 6L2 in the B direction from the face side end surface 12a, and in the main body 12A portion within the no-hole area ARA, an end stop 22 formed in an annular shape is attached to the gauge. It is provided in close contact with the GgJ surface in FIG. 4 of the link 11. As shown in FIG. 14, the end stopper 22 has an outer ring 22a and an inner ring 22b.
connected via d.

In addition, the inner ring 22b is connected to the inner circumferential surface 12f of the main body 12A via the joint 12g in a manner that matches the outer ring 22a, and furthermore, the inner ring 22b is connected to the inner peripheral surface 12f of the main body 12A through the joint 12g.
A plurality of holes 12c for the passage of concrete are drilled through the portion at predetermined pitch intervals on the circumference and spaced apart from each other by a predetermined distance in the directions of arrows A and B.

Further, the gauge ring 11 is provided with a formwork 13 assembled in a ring shape as shown in FIGS. 2 and 3 and connected in the left-right direction in FIG. 1.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 15, the cutter 3 is rotated by the drive motor S, and the ram 6a of the excavation jack 6 is projected in the direction B in FIG. Press in the direction of the face 16, that is, in the six directions of the arrows. Then, due to the pressing force, the cutter 3 and the face J6 come into contact with each other with a predetermined contact pressure, the face 16 is excavated by the cutter 3, and at the same time, the outer shell 2 is excavated in the entry direction, and the tunnel 15 is connected to the shield excavator 1. behind.

That is, it is formed on the right side of FIG.

As the tunnel 15 is formed in this way, it is necessary to construct the lining 2o to prevent the excavated earth 19 from collapsing, and the construction of the lining 20 is performed in the following steps. That is, when the shield excavator 1 has dug in the entry direction by a length Ll corresponding to one ring of the formwork 13,
As shown in FIG. 6, the ram 6a of the digging jack 6 is
It is in a state of protruding in the B direction, and the press ring 7 is also in a state of moving in the B direction.

In this state, as shown in FIG. 7, the ram 6a is moved back in the incoming direction by a distance L1. Then, the end stop 22A and formwork 1' of the part where concrete 21 was poured just before
3 The gauge ring 11 is turned on from A and moves in the A direction, and a space of distance L1 is formed between the gauge ring 11 and the end stop 22A and the formwork 13A. Therefore, the reinforcing iron plate 12 is assembled and installed together with the end stop 22B in the space, as shown by the imaginary line in FIG.

That is, the face side end surface 12a of the first main body 12A is fitted into the engagement groove 11a, and the rear end portion 12e of the first main body 12A is inserted into the first main body 12A.
As shown in Figure 4, the reinforcing steel plate 12 installed on the right side of Figure 1
It is assembled in such a way that it is connected to the face side end surface 12a of.

Next, the formwork 13B is placed in contact with the formwork 13A shown in FIG.
are assembled and installed, and a concrete placement space 23 is formed between the formwork 13B, gauge ring 11 (end stop 22B), press ring 7, and end stop 22A. In this state, as shown in FIG.

A concrete supply pipe 25 is connected to the formwork 13B, and concrete 21 is placed in the concrete placement space 23 using the concrete supply pipe 25. Then, the concrete 21 is supplied to the inner circumference of the concrete casting space 23, that is, between the formwork 13B and the reinforcing iron plate 12, and also to the outer circumference, that is, between the reinforcing iron plate 12 and the press ring 7. It is supplied through a plurality of holes 12& formed in the.

For this reason, the entire concrete placement space 23.

Concrete 21 is placed densely.

In addition, at this time, the air in the concrete placement space 23 is
Since the air is discharged to the outside through the air vent pipe L3a appropriately provided in the formwork 13, the pouring operation of the concrete 21 into the concrete placement space 23A is performed smoothly. Once the concrete 21 has been placed, as shown in FIG. 9, the press ring jack 9 is driven to gradually move the press ring 7 back in the entry direction. Then, after the press ring 7 has passed, the outer shell 2 and the poured concrete 1 to 2 are separated.
A space 26 is formed between the two. Therefore, as the press ring 7 moves in the A direction, the concrete 21 is discharged from the concrete discharge pipe 10 into the space 2, as shown in FIG.
6 and fills the space 26 with concrete 21. The press ring 7 moves in the entry direction, and as shown in FIG.
When the position substantially coincides with the installation position B, as shown in FIG. 12, the ram 6a of the excavation jack 6 is driven to protrude in the direction B, and the canter 3 is rotated to start the excavation operation.

Then, as mentioned in the defect, the outer shell 2 starts to move in the inward direction, and after the outer shell 2 moves, a tail void 27 is created between the concrete 21 filled with light and the ground 19. It is formed. Therefore, as the outer shell 2 moves in the A direction, the press ring jack 9 is driven to gradually move the press ring 7 in the B direction in synchronization with the movement of the outer shell 2.

Then, the unhardened concrete 21 in the concrete placement space 23 and the space 26 that was previously placed is pressed against the side surface 7a of the press ring 7 and flows to fill the tail void 272. Thus, as shown in FIG. As shown in , when the press ring 7 is moved in the B direction as the outer shell 2 moves in the A direction, the tail void 27 generated as a result of the movement of the outer shell 2 is
It is filled effectively.

Since the press ring 7 is formed in an annular shape, the filling member such as the concrete 21 is pressed against the entire circumference of the ring with uniform pressure, and therefore the filling operation of the tail void 27 is applied to the entire circumference of the outer shell 2. The process is uniform and in good condition throughout.

In this way, when the outer shell 2 is propelled by one ring, the press ring 7 has its side surface 7a aligned with the rear end of the outer shell 2, as shown in all six figures, and the lining 20 for one ring is moved. Construction is complete. In addition, at this time, the pouring part 29 of the concrete 21 is connected to the press ring 7 as shown in FIG.
is formed into a stair-like shape.

In addition, groundwater 33 shown by the imaginary line in Figure 4 flows from the surrounding ground 19 into the pouring joint 29 of the lining 2o after construction.
When the groundwater 33 flows in the A direction along the outer circumferential surface 29a of the spouting portion 29 and reaches the end stop 22, the groundwater 33
branches, and a part of it flows into the gap between the right side surface of the outer ring 22a in the figure and the poured concrete, flows down the gap in the figure, and reaches the joint 12d. Then, since the joint L2a is located within the unmanned area ARA, the groundwater 33 changes its course to the right in the figure and flows along the outer peripheral surface 12b at the joint 12d, with its downward flow blocked. It flows in direction B and reaches hole L2c. Then, the groundwater 33 flows around the hole 12c into the inner peripheral surface 12f, further flows in the inlet direction, and reaches the joint 12g.

The groundwater 33 that has reached the joint 12g changes its course, flows down from the joint 12g along the inner ring 22b, and leaks to the outside.

Further, the other part of the groundwater 33 that has reached the end stop 22 flows down along the left side surface of the outer ring 22a in the figure, and reaches the joint L2d. Then, since the joint 12d is provided in the non-perforated area ARA, the groundwater 33 changes its course and flows along the outer circumferential surface 12b, with its downward flow in the figure blocked by the joint 12d. The water flows in the inlet direction and reaches the hole 12 ( ) of the reinforcing iron plate 12 installed on the left side of the figure.The groundwater 33 that has reached the hole 12c goes around the hole 12c,
Further, it flows in the direction B along the inner circumferential surface 12f to form the connecting portion 12.
reaches g.

Then, the groundwater 33 changes its course and flows into the inner ring 22b.
6. However, the water flows downward in the figure and leaks to the outside.
This is because the path (aqueduct) through which the groundwater 33a flows is bent due to the end stop 22 being provided in the non-perforated area ARA, and its total length becomes longer.

The effectiveness of stopping groundwater 33 will be greatly enhanced.

(f) 1. Effects of the Invention As described above, the present invention has a main body 2A formed in a cylindrical shape, and has no holes in the main body 12A over a predetermined distance L2 from the end surface 12a. A plurality of holes 1.20 are formed through the main body portion 12A outside the unmanned area ARA, and the unmanned area ARA is formed.
Since the end stop 22 formed in an annular shape is provided in the A portion of the main body 12 in the RA, the flow of the underground boss 33 is improved more than when the end stop 22 is assembled to the main body 12A so as to overlap the hole 12c. The total length of the route (water supply) can be lengthened, and water leakage from the end stop 22 can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a construction site S of a tunnel lining in which the reinforcing steel plate for tunnel lining according to the present invention is used, and FIG. 2 is a sectional view taken along the - shore line in FIG. 1. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1. Figure 4 is an enlarged view of the jacking part of the shield excavator. FIG. 5 is a sectional view taken along the line V-■ gland in FIG. 4. Figures 6 to 13 are process diagrams showing how the lining is constructed using reinforcing iron plates for tunnel lining, and Figure 14 shows an embodiment of the reinforcing iron plate for tunnel lining according to the present invention. FIG. 12... Reinforcement iron plate 12A... Main body 12a... End face 12c... Hole 22... End stop A RA... No hole area No. Figure 6 Figure 7 Figure 9 Figure 10 Figure 11 Figure 12 Figure 14 /'e'

Claims (1)

[Scope of Claims] A main body formed in a cylindrical shape, a non-porous region is formed in the main body over a predetermined distance from an end face, and a plurality of non-porous regions are formed in the main body portion outside the non-porous region. A reinforcing iron plate for tunnel lining, comprising: a hole drilled through the plate; and a ring-shaped end stopper provided in the main body portion within the non-perforated region.