JP3607752B2 - Inter-ring joint for segment ring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inter-ring joint for each segment ring constituting a shield tunnel, and more particularly to an inter-ring joint that can cope with displacement of both segment rings to be connected.
[0002]
[Prior art]
When a shield tunnel is constructed in the ground where there is a risk of liquefaction or in soft ground, the shield tunnel is subjected to great pressure due to seismic motion or consolidation settlement. This large pressure causes displacement in each segment ring that constitutes the shield tunnel, and the axis of each segment ring and the axis of the shield tunnel do not coincide with each other. Will occur.
[0003]
Therefore, as a countermeasure corresponding to the displacement of each segment ring resulting from this large pressure, conventionally, a flexible segment ring is inserted between the segment ring constituting the shield tunnel and the adjacent segment ring. It is generally known that a flexible segment ring can absorb the displacement by deformation.
[0004]
[Problems to be solved by the invention]
However, the conventional flexible segment ring described above generally has a large amount of deformation when subjected to pressure. For this reason, the shield tunnel constituted by each segment ring including the conventional flexible segment ring sometimes has a large step in the tunnel axis direction when displaced under pressure.
[0005]
Moreover, the above-described conventional flexible segment ring is generally very expensive in structure, and the construction cost of the entire shield tunnel using the flexible segment ring is also expensive.
[0006]
The present invention was devised in view of the above-described circumstances, and the object thereof is to be able to cope with displacement with an inexpensive structure and to cope with large pressure (deformation) by suppressing displacement due to pressure to a certain amount. An object of the present invention is to provide an inter-ring joint for a segment ring that can be performed by a plurality of rings.
[0007]
[Means for Solving the Problems]
The ring-to-ring joint for segment rings according to the present invention includes both connecting plates provided on connecting surfaces of both segment rings to be connected, and connecting bolts that connect the segment rings by tightening through both connecting plates. With. The connecting bolt is arranged so that its bolt axis can be varied from a position parallel to the tunnel axis of the shield tunnel to a position intersecting the tunnel axis, and is interposed when both connecting portions are tightened. The urging portion is configured to maintain the tightening state of both connecting plates (the connected state of both segment rings) following the displacement of both segment rings. Further, both connecting plates in both segment rings to be connected are formed with locking portions that are locked to each other and restrain the displacement of both segment rings to a certain amount when tightened with a connecting bolt.
[0008]
And according to such an inter-ring joint for segment rings of this invention, it is set as the simple and cheap structure which consists of both connection plates and the connection bolt arrange | positioned through the urging | biasing part. In addition, the structure including both the connecting plates, the urging portion, and the connecting bolts can reliably maintain the tightened state of the connecting plates following the displacement of the two segment rings. Further, the locking portions provided on the two connecting plates lock each other to suppress the displacement of both segment rings to a certain amount so that a plurality of rings can cope with a large pressure (deformation).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an inter-ring joint for a segment ring according to the present invention will be described with reference to illustrated embodiments.
[0010]
An inter-ring joint 1 (see FIG. 1) of each segment ring 2 provided to correspond to the displacement of each segment ring 2 constituting a shield tunnel (not shown) is connected to both segment rings 2 to be connected. Both connecting plates 3 provided on the surface 2a and connecting bolts 4 that connect both segment rings 2 by penetrating and tightening both connecting plates 3 are provided.
[0011]
The connecting bolt 4 is arranged so that its bolt axis can be changed from a position parallel to the tunnel axis of the shield tunnel to a position intersecting the tunnel axis. The urging portion 5 interposed at the time of tightening is configured to maintain the tightening state of both connecting plates 3 (the connected state of both segment rings) following the displacement of both segment rings 2. In addition, the connecting plates 3 in the two segment rings 2 to be connected have locking portions 6 that can be locked to each other and restrain the displacement of the two segment rings 2 to a certain amount when tightened with the connecting bolt 4. Is formed.
[0012]
As shown in FIG. 2, the two connecting plates 3 in this embodiment are attached to both side plates 8 provided with anchor bars 7, and are configured to be substantially U-shaped with both side plates 8. . Further, as shown in FIG. 2, the engaging portions 6 formed on both the connecting plates 3 are connected to the engaging projections 13 formed on the connecting plate 3 in one segment ring 2 and the connecting portions in the other segment ring. It consists of a locking recess 14 formed in the plate. When the segment rings 2 are connected, the locking projections 13 of one of the connection plates 3 enter the locking recesses 14 of the other connection plate 3, and when the two segment rings 2 are displaced, the locking projections 13 The outer peripheral surface of the portion 13 is in contact with the inner peripheral surface of the locking recess 14 so that the displacement is suppressed to a certain amount.
[0013]
The connecting plate 3 may be one in which a plurality of steel plates are assembled by welding or one using cast iron such as ductile cast iron. Since the cast iron connecting plate 3 is formed by integral molding, the engaging portion 6 that suppresses the displacement to a certain amount can be easily formed on the connecting plate 3.
[0014]
In addition, the connecting bolt 4 in this embodiment has both biasing portions 5 disposed between the bolt head 4a, the connecting plate 3 and the nut 10 and the connecting plate 3 screwed to the bolt screw portion 4b. Thus, it is configured such that the tightening state of both connecting plates 3 can be maintained following the displacement of both segment rings 2. As the urging member 11 of the urging portion 5, a coil spring as shown in FIG. 1 or a viscoelastic body such as rubber as shown in FIG. 5 can be considered.
[0015]
As the configuration of the urging unit 5, in addition to the urging member 11 such as a coil spring shown in FIG. 1, the embodiment shown in FIG. 4 is also conceivable. The urging portion 5 in FIG. 4 is disposed between the pedestals 12 whose contact surfaces with the connecting plate 3 are formed in a spherical shape, and between the pedestals 12 and the bolt heads 4 a and the nuts 10. It comprises a coil spring which is the biasing member 11 made. With such a configuration, the connected segment rings 2 are displaced, and the arrangement position (bolt axis position) of the connection bolt 4 is changed from a position parallel to the tunnel axis of the shield tunnel to a position intersecting the tunnel axis. Even if it fluctuates, the biasing member 11 (coil spring) is always biased in the axial direction of the connecting bolt 4 by the action of the pedestal 12, so that the connecting state of the connecting plates 3 (the connection of the two segment rings 2) State) can be reliably maintained.
[0016]
In addition, the code | symbol 9 in FIG. 1 is the perimeter groove | channel for a water stop seal, and can maintain the waterproofness after both segment ring displacement by setting it as the width corresponding to the shift | offset | difference of both the segment rings 2 connected. .
[0017]
When the segment rings 2 are connected to each other using the inter-ring joint 1 having such a configuration, the inter-ring joint 1 behaves as described below.
[0018]
First, when the segment rings 2 are connected to each other, in order to secure the connection accuracy, as shown in FIG. 6, the convex portion 15 and the concave portion 16 having a cross section in which the shearing force due to the weight of the segment ring 2 is maintained. And make it fit.
[0019]
More specifically, the positioning convex portion 15 is formed on the connecting surface 2 a of one segment ring 2 to be connected, and the positioning concave portion 16 is formed on the connecting surface 2 a of the other segment ring 2. Here, the positioning convex portion 15 is configured so that the shearing force due to the weight of the segment ring 2 is maintained, and the segment ring 2 undergoes shear fracture when it receives pressure. Therefore, the positioning irregularities 15 and 16 are configured not to resist the pressure and not to restrain the displacement of both the segment rings 2 caused by the pressure.
[0020]
Then, excessive deformation occurs in the ground due to an earthquake or the like, and when pressure is applied to each segment ring 2 constituting the shield tunnel, the positioning convex portion 15 shown in FIG. 6 is cut by shearing force, Displacement occurs in both the segment rings 2 connected to each other.
[0021]
The function of suppressing the displacement of the segment ring 2 at this time is given by the tightening force of the connecting bolt 4 or the biasing member 11 (spring or viscoelastic body) of the biasing portion 5 as shown in FIG. It is held by the fastening force. Thereafter, when the shear deformation is further increased, the action of the engaging portion 6 formed of the small-diameter or large-diameter ridge 9 formed in the ring shape shown in FIG. 2, that is, as shown in FIG. In addition, the protrusions 9 are regulated by the abutment of the protrusions 9.
[0022]
From these facts, according to the inter-ring joint for segment rings of the present invention, the displacement of both the segment rings 2 is restricted to a constant amount by the engaging portion 6 of the connecting plate 3, and a large step is formed between both the segment rings 2. It can be prevented from occurring. Further, even when the connected segment rings 2 are displaced, the connecting bolt 4 and the urging portion 5 act to secure the tightening state of the connecting plates 3, that is, the connecting state of the segment rings 2. be able to.
[0023]
If the displacement amount is further increased, the displacement is absorbed by the displacement of the adjacent segment ring 2. When this very large deformation is expected, the width of the segment ring 2 (generally 90 to 100 cm 2) is reduced, so that a larger deformation can be achieved without increasing the step between the two segment rings 2. Can follow.
[0024]
When secondary lining is performed on each segment ring 2 (primary lining) connected using the inter-ring joint 1 of the present invention, a secondary lining cover 17 as shown in FIGS. 1 and 4 is used. By covering, the space which can change the connecting bolt 4 is ensured. This makes it possible to place concrete into the bolting recess 18 during secondary lining. The secondary lining cover 17 includes a cylindrical cover main body portion 17a attached to the connecting plate 3, and a cap portion 17b attached to the inner end of the work recess 18 of the cover main body portion 17a.
[0025]
【The invention's effect】
According to the inter-ring joint for segment rings of the present invention, the inter-ring joint can be provided at a low cost as a simple structure comprising both connecting plates and a connecting bolt disposed with an urging portion interposed therebetween. Moreover, the structure which consists of both these connection plates, an urging | biasing part, and a connection bolt can perform the fastening state maintenance of both connection plates performed according to the displacement of both segment rings reliably. Furthermore, the locking parts that can be locked to each other on both connecting plates suppress the displacement of both segment rings to a certain amount so that a plurality of rings can cope with a large pressure (deformation). Can do.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a connection state of both segment rings using an inter-ring joint for segment rings according to the present invention.
FIG. 2 is a schematic perspective view showing a connecting plate in an inter-ring joint for segment rings according to the present invention.
FIG. 3 is a schematic cross-sectional view showing a state in which displacement has occurred in both segment rings connected using the inter-ring joint for segment rings of the present invention.
FIG. 4 is a schematic sectional view showing another embodiment of the inter-ring joint according to the present invention.
FIG. 5 is a schematic cross-sectional view showing another aspect of the urging portion used in the inter-ring joint for segment rings according to the present invention.
FIG. 6 is a schematic perspective view showing an uneven portion for positioning used when connecting both segment rings.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inter-ring joint for segment rings, 2 ... Segment ring, 2a ... Connection surface, 3 ... Connection plate, 4 ... Connection bolt, 4a ... Bolt head, 4b ... Bolt screw part, 5 ... Energizing part, 6 ... Engagement Stop part, 7 ... Anchor bar, 8 ... Side plate, 9 ... Circumferential groove for water stop seal, 10 ... Nut, 11 ... Biasing member, 12 ... Base, 13 ... Locking convex part, 14 ... Locking concave part, 15 DESCRIPTION OF SYMBOLS ... Positioning convex part, 16 ... Positioning recessed part, 17 ... Secondary lining cover, 17a ... Cover main-body part, 17b ... Cap part, 18 ... Concave for bolting operation | work.

Claims (1)

A ring-to-ring joint of each segment ring provided to correspond to the displacement of each segment ring constituting the shield tunnel;
Both connecting plates provided on the connecting surfaces of both segment rings to be connected, and connecting bolts connecting the two segment rings by tightening through both connecting plates;
The connecting bolt is arranged so that its bolt axis can be changed from a position parallel to the tunnel axis of the shield tunnel to a position intersecting with the tunnel axis. The intervening biasing portion is configured to maintain the tightening state of the two connection plates following the displacement of both segment rings, that is, the connection state of both segment rings ,
The connecting plates are formed with locking portions that can be locked to each other and restrain the displacement of the segment rings to a certain amount when tightened with the connecting bolts. Inter-ring joint for segment ring.

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