JPH0786312B2 - Vertical tunnel segment connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention forms a longitudinal end of a tubular tunnel segment, which is sequentially connected to a rear portion of a shield excavator for excavating a tunnel, through a side wall of a vertical shaft. Vertical tunnel segment connecting structure for supporting in a vertical opening, and more particularly, a vertical segment connecting and supporting a segment so as to be sealable against external earth pressure and displaceable in the longitudinal and radial directions thereof. Regarding connection structure.

[Prior Art] Generally, in the tunnel shield construction method, an opening having an inner diameter larger than the outer diameter of the shield excavator is formed through the side wall of the vertical shaft, and the shield excavator is launched from the opening or It reaches the inside of the shaft through the opening.
The longitudinal end of the tubular tunnel segment connected to the rear of the shield excavator is located in the opening of the vertical shaft.

Conventionally, the annular space between the opening inner surface of the vertical shaft and the segment outer peripheral surface is filled with concrete, whereby the seal between the opening inner surface and the segment outer peripheral surface and the connection support of the segment to the vertical shaft side wall are achieved. There is. Further, generally, at the side wall opening of the vertical shaft, a sealing means for sealing between the inner peripheral surface of the shaft and the outer peripheral surface of the shield excavator and the segment connected to the rear part thereof is arranged against the external earth pressure. However, a method of leaving such a sealing means in the opening as it is and filling it with the above-mentioned concrete is also adopted. According to this method, sealing is more reliably performed by the sealing means left between the inner surface of the opening of the vertical shaft side wall and the outer peripheral surface of the segment.

[Problems to be Solved by the Invention] In the above-described conventional tunnel segment connection structure for a vertical shaft, since the segments are rigidly connected to the vertical shaft side wall via concrete, an external force due to ground subsidence, an earthquake, or the like is applied to the tunnel. When added to the segment, stress is likely to be concentrated on the rigid joint between the segment and the vertical shaft side wall made of concrete, so that cracks and fractures are likely to occur at that location, and the sealability may be impaired. . Further, the external force applied to the segment may deform or damage the segment itself, which may impair the sealing property.

Therefore, an object of the present invention is to secure the sealing property between the opening and the segment at the connection between the opening of the vertical shaft side wall and the tunnel segment, and to prevent the displacement in the longitudinal and radial directions of the tunnel segment due to an external force. It is an object of the present invention to provide a vertical tunnel segment connection structure of a vertical shaft having a simple structure capable of absorbing and preventing damage to the connecting portion between the segment and the vertical shaft side wall and the segment itself.

Another object of the present invention is to provide a tunnel segment connection structure for a vertical shaft, which is capable of connecting and supporting a tunnel segment so as to be sealable with respect to an opening of a vertical shaft side wall and displaceable in the longitudinal and radial directions thereof. .

[Means and Actions for Solving the Problem] In order to achieve the above object, according to the present invention, a tunnel of a vertical shaft for connecting and supporting a longitudinal end of a tunnel segment to an opening formed through a side wall of the vertical shaft. A segment connection structure, which is a pressure-resistant sealing means for sealing between an inner surface of the opening of the shaft and an outer peripheral surface of the tunnel segment against an external earth pressure, and is provided behind the sealing means. Elastic support means for supporting the tunnel segment with respect to the side wall of the vertical shaft so as to be displaceable in the longitudinal direction and the radial direction thereof, and the sealing means is an attachment member attached to the opening, and an inner circumference. A ring-shaped elastic seal plate attached to the attachment member such that a side portion thereof closely contacts the outer peripheral surface of the tunnel segment, an inner surface of the opening, and the tunnel segment. And a swingable support member attached to the attachment member so as to support the back surface of the elastic seal plate against the earth pressure outside the shaft with the outer peripheral surface of the shaft. A vertical shaft tunnel segment connection structure is provided.

In the tunnel tunnel connection structure of the vertical shaft having the above configuration, by means of pressure-resistant sealing means between the inner surface of the opening formed through the side wall of the vertical shaft and the outer peripheral surface of the longitudinal end of the tunnel segment, the outside of the vertical shaft. Land subsidence because it can seal against earth pressure and can effectively absorb the longitudinal and radial displacements of the tunnel segment due to external force by the elastic support means provided behind the sealing means. There is no risk of cracks or breakage occurring at the connection between the opening of the vertical shaft side wall and the tunnel segment, the tunnel segment itself, etc. due to the effects of earthquakes or earthquakes. Moreover, the sealing means is a mounting member mounted on the opening of the vertical shaft, a ring-shaped elastic seal plate mounted on the mounting member so that the inner peripheral side portion closely adheres to the outer peripheral surface of the tunnel segment, and the vertical shaft A swingable supporting member attached to the mounting member so as to support the back surface of the elastic sealing plate against the earth pressure outside the shaft between the inner surface of the opening and the outer peripheral surface of the tunnel segment. Therefore, even if the tunnel segment is displaced in the radial direction with respect to the opening of the vertical shaft, the support member swings according to the radial displacement of the tunnel segment, thereby properly supporting the back surface of the elastic seal member. Can continue to do. Therefore, the pressure resistant sealing function between the inner surface of the opening of the vertical shaft and the outer peripheral surface of the tunnel segment can be maintained.

Preferably, the pressure-resistant sealing means is arranged at the outer wall surface side end of the vertical shaft in the opening or in the vicinity thereof. As a result, it is possible to prevent the debris, backfilling material, etc. from entering and filling between the inner surface of the opening of the vertical shaft and the outer peripheral surface of the tunnel segment by means of the sealing means. It is possible to prevent the function from being hindered by the filling of the earth and stone and the backfill material.

In the above structure, preferably, the elastic support means includes an annular elastic member that sealably fills the annular space between the inner surface of the opening of the vertical shaft side wall and the outer peripheral surface of the segment. With such a configuration, the segment is supported by the elastic member in the longitudinal side wall opening so as to be displaceable in the longitudinal direction and the radial direction, and the opening between the vertical shaft side wall and the segment are sealed and elastic. Since it is sealed against the external earth pressure by both the elastic member and the elastic member, more excellent sealing performance can be secured.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings. Note that, in the illustrated embodiment, the same components are designated by the same reference numerals.

1 to 3 show a first embodiment of the present invention. First, referring to FIG. 1, a side wall 10 of a vertical shaft has a substantially circular opening 11 formed therein as a starting entrance of a shield excavator (not shown). On the other hand, inside the tunnel formed by the shield excavator in a substantially horizontal direction, between the rear end of the propulsion jack of the shield excavator and the front end of the already assembled segment, every time the shield excavator advances a predetermined amount. A new segment, such as a cylindrical segment 13
Are continuously provided in the longitudinal direction of the tunnel. The segment 1 connected in the tunnel in this way terminates in the opening 11 or in the vertical shaft.

At the opening 11 of the vertical shaft side wall, a sealing means for sealing the space between the opening 11 and the outer periphery of the segment 13 against the external earth pressure.
14 are provided. The sealing means 14 has an opening 11 so that the inner peripheral side portion is in close contact with the outer peripheral surface of the segment 13.
The elastic ring-shaped elastic seal plate 15 made of, for example, rubber held on the side, and the back side of the seal plate 15 between the inner surface of the opening 11 and the outer peripheral surface of the segment 13 against the external earth pressure. And a support member 16 attached to the opening 11 side so as to support it.

More specifically, a fixed attachment member 17 is provided in the opening 11, and the attachment member 17 is provided integrally with the tubular portion 18 having a length substantially equal to the thickness dimension of the vertical shaft side wall 10 and both ends thereof. Flange portions 19 and 20 are provided, one flange portion 19 has an outer diameter dimension larger than the tubular body 18, and the other flange portion 20 has an inner diameter dimension smaller than the tubular portion 18. is doing. The large-diameter flange 19 is the vertical shaft side wall.
Plural embedded bolts 21 and nuts 22 provided on the inner surface of 10.
It is fixed to the inner surface of the vertical shaft side wall 10 by means of this, so that the tubular portion 18 and the small-diameter flange portion 20 are opened 11
It is arranged inside.

As shown in FIGS. 1 and 3, the support member 16 includes a plurality of metal fixed base portions 23 and a movable metal flap portion 24 pivotally attached to the inner ends of the respective fixed base portions 23 in the radial direction. With the ring-shaped spacer 25 interposed between the fixed base portion 23 of the support member 15 and the seal plate 15, the fixed base portion 23 and the seal plate 15 have a small-diameter flange portion 20. It is fixedly held on the inner surface of the flange portion 20 of the fixed mounting member 17 by a bolt 26 and a nut 27 penetrating therethrough.

The outer diameter dimension of the segment 13 is set smaller than the outer diameter dimension of the shield excavator, and the minimum opening diameter defined by the inner diameter of the seal plate 15 and the radially inner end of the movable flap portion 24 is It is set to be smaller than the outer diameter dimension of the segment 13. Therefore, the movable flap portion 24 and the seal plate 15 are expanded and displaced toward the outside of the vertical shaft side wall 10 by the shield excavator when the shield excavator starts from the opening 11 toward the outside of the vertical shaft side wall. When
Seal plate whose back side is supported by the movable flap part 24
The space between the inner surface of the opening 11 and the outer peripheral surface of the shield excavator is sealed by 15 against the earth pressure from the outside.

Further, when the rear end of the shield excavator separates from the movable flap portion 24 and the seal plate 15, the movable flap portion 24 continues to incline toward the outside of the shaft as shown in FIG. It comes into contact with the outer peripheral surface,
On the other hand, the seal plate 15 is to be repacked on the outer peripheral surface of the segment 13 while the back side thereof is in contact with and supported by the movable flap portion 24.
The space between the outer peripheral surface and the outer peripheral surface is continuously sealed against the external earth pressure. In this way, a seal is maintained between the opening 11 of the vertical shaft side wall 10 and the outer peripheral surface of the segment 13 during tunnel formation.

As shown in FIG. 1, a backfill material 28 made of, for example, mortar or the like is provided in a gap formed between the inner surface of the tunnel and the outer peripheral surface of the segment 13 from an injection port (not shown) provided at an appropriate position of the segment 13. Injected. The backfill material 28 can be injected so as to fill the cavity in the vicinity of the opening 11 of the vertical shaft side wall 10, but since its strength is usually about 150 to 200 kg / cm ² , the tunnel segment 13 and the vertical shaft It is not strong enough to firmly bond to the side wall 10.

Conventionally, the gap between the outer peripheral surface of the segment and the inner surface of the opening of the vertical shaft side was filled with concrete in order to firmly connect the tunnel segment and the vertical shaft side wall, but due to the effects of ground subsidence, earthquakes, etc. If is displaced in the longitudinal or radial direction with respect to the vertical shaft side wall, there is a risk of cracks or breakage in the concrete joint portion due to stress concentration.Once the concrete concrete portion is broken, the segment support In some cases, the strength was greatly reduced, and the displacement and sedimentation of the segment were more likely to occur, resulting in the loss of the sealability between the segment and the vertical shaft side wall.

Therefore, according to the present invention, as shown in FIG.
In the inside of 11, there is provided an elastic support means 30 for supporting the segment 13 with respect to the vertical shaft side wall 10 so as to be displaceable in the longitudinal and radial directions thereof. In the embodiment shown in FIGS. 1 and 2,
The elastic support means 30 has a structure in which a ring-shaped inner elastic member 31 and a ring-shaped outer elastic member 32 are combined, and both elastic members 31, 32 are bolts 2 arranged in the circumferential direction.
They are fitted to each other along the circumferential surface passing through the axis of 6.

The elastic members 31 and 32 can be made by molding synthetic rubber or natural rubber such as urethane rubber, neoprene rubber, and silicon rubber. Further, the hardness of the elastic members 31, 32 can be appropriately set according to the required support strength, abrasion resistance and the like. Further, when the elastic support means 30 has a divided structure of the inner and outer elastic members 31, 32, the segment 13 and the tubular portion 1
Although the insertion work between 8 and 8 becomes easy, both elastic members 31,
It is also possible to form 32 integrally.

Another bolt 33 is further screwed to the nut 27 that is screwed into the bolt 26, and after inserting both elastic members 31, 32 between the segment 13 and the tubular portion 18 of the fixed mounting member 17, Washer member
By attaching 34 and nut 35 to bolt 33, both elastic members 31, 32 can be held between segment 13 and tubular portion 18 of fixed mounting member 17.

Furthermore, by tightening the nut 35, both elastic members 3
Since they can be compressed in the axial direction of 1, 32, both elastic members 31, 32 can be brought into pressure contact with the inner surface of the tubular pair 18 of the fixed mounting member 17 and the outer peripheral surface of the segment 13, respectively, and the sealing performance is improved. Can be secured. In addition, by adjusting the tightening amount of the nut 35, it is possible to adjust the magnitude of the compressive stress in the radial direction of both elastic members 31, 32, so that the support strength of the segment 13 by the elastic members 31, 32 is adjusted. can do.

When the nut 35 is tightened, the inner diameter side portion of the inner elastic member 31 may tend to expand in the axial direction, so that the washer member 34 can be inclined. In such a case, if a nut having a flat contact end side with respect to the washer member 34 is used, it may be difficult to tighten the nut due to biting. In order to eliminate such inconvenience and facilitate tightening of the nut, in the illustrated embodiment, the abutting end of the nut 35 with respect to the washer member 34 is formed in a substantially hemispherical shape. There is.

In the vertical tunnel segment connection structure having the above configuration, since the end of the tunnel segment 13 is elastically supported in the opening 11 with respect to the vertical shaft side wall 10 through both elastic members 31 and 32, ground subsidence Due to earthquakes, earthquakes, etc.
When an external force is applied to 13, the longitudinal and radial displacements of the segment 13 with respect to the vertical shaft side wall 10 are absorbed by the elastic members 31 and 32 between the opening 11 and the segment 13 without any trouble, and There is no risk of cracks or breakage occurring at the connection between the opening 11 of the vertical shaft side wall 10 and the segment 13 due to subsidence or an earthquake.

Further, in the above structure, the space between the opening 11 of the vertical shaft side wall 10 and the segment 13 is sealed against the external earth pressure by both the sealing means 14 and the elastic members 31, 32. Further, it is possible to secure a better sealing property.

4 and 5 show a second embodiment of the present invention. In this embodiment, the inner elastic member 31 of the elastic supporting means 30 is formed into a hollow tube shape, and more preferably, the inner elastic member 31 is provided with an air inlet 31a.

In such a configuration, when the inner elastic member 31 is inserted between the segment 13 and the outer elastic member 32, the inner air pressure of the inner elastic member 31 is released to the atmosphere, so that the inner elastic member The mounting work of the member 31 can be easily performed. Then, after the inner elastic member 31 is attached, compressed air is injected into the inner elastic member 31 from the air injection port 31a, and the internal pressure is adjusted to easily support the segment 13 with respect to the vertical shaft side wall 10. Can be adjusted to.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, the inner elastic member 31 is formed in a hollow tube shape as in the second embodiment. Further, in this embodiment, the washer member 34 and the end portion of the segment 13 are connected by the flexible plate 36. That is, the flexible plate 36 is fixed to the washer member 34 by the nut 35,
Further, it is fixed to the end of the segment 13 by a bolt 37 and a nut 38 provided at the end of the segment 13. Since the flexible plate 36 is formed in a corrugated shape in the radial cross section, the displacement of the segment 13 in the radial direction and the longitudinal direction can be absorbed.

In such a configuration, the washer member 34 and the segment 13
Since the gap between and is closed by the flexible plate 36, it is possible to prevent the tubular inner elastic member 31 from bulging from the gap to the inside of the vertical shaft.

FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, similarly to the third embodiment, the washer member 34 and the end portion of the segment 13 are connected by the flexible plate 36, so that the upper cylinder portion 18 and the outer peripheral surface of the segment 13 are connected to each other. A generally closed annular space is defined in the inside of which an elastic member 39 forming an elastic support means 30 is injected.
As the elastic member 39, for example, silicon, urethane foam,
Raw rubber or the like can be used.

The washer member 34 and the like can be provided with an injection port (not shown) for injecting the elastic member 39.

In such a configuration, a mold for pre-molding the elastic member is unnecessary, and cost reduction can be achieved. When such an injection type elastic member 39 is used, the bolt 33 can be separated from the nut 27 and embedded in the injection type elastic member 39 as shown in the drawing.

FIG. 8 shows a fifth embodiment of the present invention. In this embodiment, instead of the flexible plate 36 of the fourth embodiment, a sealing means 40 having substantially the same structure as the sealing means 14 is used.
Is provided together with the washer member 34, and both sealing means 14, 4
The elastic member 39 is injected between 0.

In such a configuration, the sealing means 14, 40 themselves can allow the radial displacement of the segment 13 until the movable flap portion is in a substantially horizontal position, so that the injection-type elastic member 39 is sealed by the sealing means 14, 40. In cooperation with 40, the relatively large radial displacement of the segment 13 can be absorbed. Further, by using the two sets of sealing means 14 and 40, the sealing property between the segment 13 and the tubular portion 18 is further improved. In addition, in the fourth embodiment, an injection port (not shown) for the elastic member 39 can be provided at an appropriate position of the sealing means 40.

Although the illustrated embodiment has been described above, the present invention is not limited to only the embodiment described above, and, for example, changes are made to the attachment form and attachment position of the sealing means 14 with respect to the opening of the vertical shaft side wall 10. In addition, the supporting member 16 in the sealing means 14 and the like may be formed of an integral metal flexible plate. Further, a suitable reinforcing member can be embedded in the elastic members 31, 32, 39.

Further, the tunnel tunnel connection structure of the vertical shaft described above can be similarly applied to the opening portion of the vertical shaft side wall which is the arrival entrance of the shield excavator.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the space between the opening of the vertical shaft side wall and the tunnel segment is sealed by the sealing means against the external earth pressure and the external force is applied. Since the displacement in the longitudinal and radial directions of the segment is absorbed through the elastic support means between the opening and the segment, the connection between the opening of the vertical shaft side wall and the segment due to the effects of ground subsidence, earthquake, etc. There is no risk of cracks, breakage, or the like occurring at the points or the segments themselves, and the durability of the connection points between the openings of the vertical shaft side walls and the segments or the segments themselves is improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a tunnel segment connection structure for a vertical shaft showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. FIG. 4 is a schematic partial rear view of the sealing means as seen from the inside of the shaft, FIG. 4 is a longitudinal sectional view of a main portion of a tunnel segment connection structure for a shaft showing a second embodiment of the present invention, and FIG. 6 is a sectional view taken along line VV, FIG. 6 is a longitudinal sectional view of a main portion of a tunnel segment connection structure of a vertical shaft showing a third embodiment of the present invention, and FIG. 7 is a vertical shaft showing a fourth embodiment of the present invention. FIG. 8 is a vertical cross-sectional view of the main part of the tunnel segment connection structure of FIG. 8, and FIG. 8 is a vertical cross-sectional view of the main part of the tunnel segment connection structure of the vertical shaft showing the fifth embodiment of the present invention. In the figure, 10 is a vertical shaft side wall, 11 is an opening, 13 is a segment, 14 is a sealing means, 15 is a sealing plate, 16 is a supporting member, 17
Is a fixed attachment member, 23 is a fixed base portion, 2 is a movable flap portion, 30 is an elastic sealing means, 31 is an inner elastic member, 32 is an outer elastic member, and 39 is an elastic member.

Claims (2)

[Claims] 1. A tunnel segment connection structure for a vertical shaft for connecting and supporting a longitudinal end of a tunnel segment to an opening formed through a side wall of the vertical shaft, the inner surface of the opening of the vertical shaft and the tunnel segment connecting structure. Pressure-resistant sealing means for sealing between the outer peripheral surface and the earth pressure against the outside, and the tunnel segment provided behind the sealing means and displaced in the longitudinal direction and the radial direction with respect to the side wall of the vertical shaft. Elastic supporting means for supporting the sealing means, and the sealing means is mounted on the mounting member so that the inner peripheral side portion is in close contact with the outer peripheral surface of the tunnel segment. A ring-shaped elastic seal plate and a back of the elastic seal plate against the earth pressure outside the shaft between the inner surface of the opening and the outer peripheral surface of the tunnel segment. Tunnel segment connecting structure intake shaft, characterized in that said and a swingable supporting member mounted to the mounting member so as to support the. 2. A tunnel segment connection structure for a vertical shaft according to claim 1, wherein said pressure-resistant sealing means is arranged at an outer wall side end of said vertical shaft at said opening or in the vicinity thereof.