JP3196149B2 - Flexible segment for shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the creation of a flexible segment for a shield construction method, in which the shield construction method segment effectively responds to seismic resistance or unequal subsidence so as to sufficiently exhibit water-tightness and expandable flexibility. Easy to handle
The purpose of this invention is to provide a mechanism that can generate stress and provide excellent durability.

[0002]

2. Description of the Related Art The shield method occupies an important position in civil engineering work, and providing flexibility in the segment avoids unequal subsidence in soft ground and damage to the shield segment itself in the event of an earthquake and the like. It is indispensable for ensuring the performance, and various studies have been made in the past. That is, such a flexible segment is set in the shield machine shell by being pushed together with the general segment by a thrust, and then a load bearing member or a sealing material is attached to the inner surface of the flexible segment and the general segment. It is common to form a secondary lining concrete on the inner surface of the segment.

[0003] That is, a construction state of one example of such a flexible segment is as shown in FIG. 9, and a frame body also serving as a secondary lining in 20 rows of general segments which is a standard body. A primary construction body 30 composed of 21, 21 and a thrust receiving body 22, 22 is shielded by a shield machine shell 3 by an erector or the like.
1 to perform a thrust excavation work in which the thrust by the shield machine is applied to the general segment 20 and the primary construction body 30.

After the transmission of the thrust by the propulsion work performed as described above is completed, the thrust receiving portion 22 is removed and a flexible secondary water blocking material 24 is removed as shown in FIG. Attach and cover cloth 25, bearing member 26
11 and an anchor member 28, an inner skin plate 29, and an inner cover 29a are provided as shown in FIG.
3 are formed.

[0005]

However, in the above-described conventional apparatus, the structure and handling are complicated, and the number of steps on site is extremely large. That is, the state of FIG.
In the state of 1, only the frame body 21 remains between the general segments 20, and the other components and the structural relationship are completely different. Since each segment or member is sequentially removed and assembled in the periphery, the number of steps must be significantly increased.

In addition, since a frame body considerably thicker than the general segment 20 is employed at the time of the primary construction, handling during the assembling is significantly different from that of the standard general segment, so that it becomes complicated. Also, as shown in FIGS. 9 and 10, the main members such as the thrust receiving unit incorporated and connected at the time of propulsion construction are removed and completely separated, and a separate member is newly incorporated therein. Therefore, the watertight connection formed at the time of the propulsion construction is disengaged by the handling thereof, and the watertightness and the stress distribution are hardly obtained properly because the connection is formed as a newly assembled state.

[0007]

SUMMARY OF THE INVENTION The present invention has been studied to solve the above-mentioned problems in the prior art, and has the same effect as a general segment by using a rigid part integrated with a specific elastic part. In the shape and dimensions, it is possible to obtain a segment having favorable flexibility while securing an effective thrust transmission function and a water stopping function even during propulsion construction and subsequent secondary lining construction,
It is as follows.

(1) A side ring having substantially the same thickness as a general segment propelled and set in an excavation hole under the thrust of the propulsion and excavation mechanism is opposed to each other, and a space between the side ring members is provided. In the skin plate provided on the outer peripheral side, a chevron bend is formed in the middle toward the outer peripheral direction, and the joining end face portions parallel to both sides of the chevron bend are formed to be uniform and connected to the joint end face portions. A flexible portion is formed by alternately assembling and connecting a plurality of flexible members sandwiching an end plate and a holding plate of a ring member with the connecting ring member, and a thrust receiving member is disposed inside the flexible portion. And the flexible member is set in a state of receiving a compressive force from a molding dimension,
A flexible segment for a shield construction method, wherein the flexible segment is incorporated so that it is still in a compressed state smaller than the molded dimension even when absorbing elongation and does not substantially exert a tensile force.

[0009]

[0010]

According to the present invention, a side ring having substantially the same thickness as a general segment which is propelled and set in an excavation hole by receiving a thrust by a propulsion and excavation mechanism is opposed to each other to flex through the side ring. The flexible body incorporated through the side ring body is handled in the same manner as the general segment, and the construction is promoted.

In each of the side ring portions, a mountain-shaped bend is formed in the skin plate provided on the outer circumferential side in the middle toward the outer circumferential direction, and a joint end face portion parallel to both sides of the angle-shaped bend is made uniform. Since the flexible portion formed by folding is provided, the joining end face portion is clamped and opposed by the end plate of the connecting ring member and the pressing plate.

As described above, a flexible portion is formed by alternately assembling and connecting a plurality of flexible members which are attached to each other by sandwiching the end plate of the connecting ring member and the holding plate at both ends and the connecting ring member. A wide balanced setting relationship of the joint end surface under conditions in which the intrusion of external earth and sand is prevented, and the flexible member and the connecting ring member are stably linked under such an unbiased working force condition. An elastic propulsion action is performed also in the flexible member portion.

As described above, by disposing the thrust receiving member inside the flexible portion formed of the combination of the flexible member and the connecting ring member, the thrust is propelled in the same thickness range as the general segment as in the general segment. Get the power transmitted.

Since the end plate and the holding plate are attached to both sides of the flexible member made of rubber or the like as described above, the flexible portion has the same characteristics as the rigid body on both sides thereof.
Provided is a highly durable flexible segment which firmly stabilizes the connection with the connection ring portion, enables a sufficient flexible bending action, and smoothes the peeling off at the both side portions.

The thrust receiving member provided inside the flexible portion is detachably provided to the side ring portion body, so that the thrust receiving member is disengaged after the propulsion work, and the thrust receiving member is removed with the flexible portion remaining. Next, incorporate the lining frame. The stable setting relationship is maintained by holding the flexible part as it is being propelled, and biased stress is generated due to the fact that the joint end surface of the flexible member is sandwiched between the end plate and the holding plate. A small and accurate sealing relationship is formed, and the sealing relationship is maintained for a long period of time to form a mechanism having excellent durability.

The flexible member is set in a state of receiving a compressive force from the molding dimension, and is in a compressed state smaller than the molding dimension even when absorbing the elongation, so that substantially no tensile force acts. Incorporation as described above allows a flexible member made of rubber or the like to be subjected to peeling or the like without exerting a tensile stress, thereby obtaining a highly durable segment.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings.
The flexible segment of the present invention at the time of the next construction is as shown in FIG. 1, and the skin plate 7 is attached to the outer surface side of the side rings 5 and 5 so that the width thereof is the same as that of the general segment 20. The height (that is, the thickness as a segment) of each of the segments 5 is set to a dimension that matches the general segment 20.

As shown in FIG. 2, the above-described skin plate 7 is assembled with the flexible member 1 and the connecting ring member 3 in which the joint end surfaces 11 having the same thickness are formed at both ends of the rubbery flexible member 1 as shown in FIG.
Are alternately assembled and positioned on the outer surface of the flexible portion 4 connected by the connector 6. The connecting ring member 3 is separate from the end plates 3a, 3a and the outer plate as shown in FIG. 3b and receiving plate 31 attached to the inner diameter side of end plate 3a
Is formed by

The flexible member 1 has an important characteristic in terms of the structure in the present invention in terms of its cross-sectional structure. The flexible member 1 has an appropriate thickness with a central portion bent and formed in a mountain shape, and has an elasticity in the width direction. However, the joint end surfaces 11 at both ends of the flexible material 1 and the end plate 3a are formed so as to have a uniform thickness by being folded from the chevron-shaped bent portion, and furthermore, to have parallel joint end surfaces 11, 11 And the connection plate 6 is firmly fastened to the connection ring member 3 by the end plate 3 a and the holding plate 2.

It is the reason that the flexible member 1 has a moderate thickness as a whole in order to obtain a preferable thrust transmission in the flexible portion 4 using such a flexible member 1 as shown in FIG. As a preferable design condition, the intermediate bent portion has a considerable thickness with respect to the width (height in the drawing) of the end plate 3a, and the width of the joint end surfaces 11, 11 is the same with respect to the thickness of the intermediate bent portion. The elastic material is selected to be about 40 to 65% of the width of the end plate 3a, and therefore, a favorable elastic propulsion action can be obtained with the flexible material 1 made of rubber even when it is subjected to a propulsive force.

The height of the flexible member 1 and the connecting ring member 3 in the inward and outward directions as described above is the same as that of the side ring 5,
The height is set to 50 to 70%, preferably about 60%, of the height of the side plate 5. Therefore, the thrust receiving member 9 is mounted on the inner surface of the side ring 5, 5 on which the members 1, 3 are mounted on the skin plate 7 side. The rings 5, 5 and the thrust receiving bolt 8 are provided to ensure transmission of propulsion by a pusher or the like of the excavator.

The above-mentioned flexible portion 4 is generally manufactured and assembled in a factory, and its shipping form is separately cut away as shown in FIG. The width and thickness are the same as those of the general segment 20, for example, the width is 900 mm, and the thickness is 250 mm. The rigid transmission of the thrust receiving bar 8 and the thrust receiving bolt 7 and the elastic transmission by the flexible portion 4 which do not generate a biased acting force can be accurately achieved.

The molding dimension (namely, dimension in the natural state) of the flexible member 1 molded of rubber or the like is as shown by a solid line in FIG.
It is set to always receive the compressive force. That is, in FIG. 4, the state of 1a indicated by a virtual line indicates the state of the regular assembly dimensions set by compression as described above, and the state of 1b also indicated by the virtual line is the state at the time of contraction and absorption. Further, the state of 1c is at the time of elongation absorption, and at the time of this elongation absorption, it is still in a compressed state smaller than the molding size,
By substantially preventing a tensile force from acting, destruction and peeling of the joint end surfaces 11, 11 due to tension can be prevented.

When the influence of the thrust on the segment is eliminated as a result of the primary construction as shown in FIG.
If the thrust receiving bolt 8 as shown in FIG. 1 is loosened and the inner thrust receiving member 9 is removed, a recess is formed on the inner surface between the side rings 5, 5, and the skin plate 7 is formed on the outer surface, of course. The flexible portion 4 remains in the majority region in the thickness of the side rings 5, 5 in a state where the flexible portion 4 has been propelled.

That is, the thrust receiving bolt 8 is removed as described above, and the secondary lining frame 12 is attached to the inside of the side ring 5 as shown in FIG. , 12 are connected by a connecting member 12a such as a wire rope, and a seal ring 14 is attached to each of the frames 12, 12, respectively, and a secondary waterproof band 15 as shown in FIGS.

The secondary waterproof band 15 has seal portions 16 at both ends.
The attachment members 17 each having an L-shaped reinforcing portion formed on the outer surface of the seal member 16 having the shape a are arranged along the axial direction, and the attachment plates 18 and 19 are also curved on the inner surface along the circumferential direction. Locking claw portions 18a and 19a are provided at each end of the mounting plates 18 and 19 so as to engage with each other, and the sealing members are provided by the restoring elasticity of the mounting plates 18 and 19. 16 is pressed against the seal ring 14, and the attachment plate 19 improves the sealing of the seal portion 16a.

According to the present invention, the secondary lining frame 1 described above is also provided.
As shown in FIG.
Can be mounted in an inverted state. That is, the flexible portion 4 is provided in the skin plate 6a located on the inner peripheral side in an inverted state from that described above on the outer peripheral side. With this configuration, after the secondary lining,
Obviously, great flexibility can be ensured in the flexible segment portion.

The secondary lining concrete 30 is applied inside the general segments 20 on both sides of the secondary lining frames 12 provided as described above, as shown in FIG. Is completed, but between the side rings 5, 5 from which the thrust receiving member 9 has been removed, an appropriate flexibility action by the flexible portion 4 is obtained, and the seal at the flexible material 1 portion is maintained and A secondary seal is also secured between the seal member 16 and the seal ring 14.

As an example, the outer diameter is 2750 mm and the inner diameter is 250
In the flexible segment of the present invention shown in FIG. 4 having a width of 0 mm and a width of 900 mm, the amount of expansion and contraction is ± 100 mm, the bending angle is 4 °,
The water pressure resistance under the condition of eccentricity 100 mm is 2 kg / internal and external pressure.
It was able to withstand cm ^{2 and} was able to respond quickly to the set conditions required for this kind of segment.

In the flexible segment of the present invention shown in FIG. 3, the expansion, contraction, bending angle and eccentricity are all twice or more, and the water resistance and the like are the same as described above.

[0031]

According to the present invention as described above, the segments for the shield method are appropriately provided with flexibility to respond immediately to seismic resistance or unequal settlement, and have a simple structure and excavation. It can be handled in exactly the same way as a standard general segment in handling during construction, has fewer parts, etc. and has excellent workability, and both ends are stably fixed to the connecting ring member with elastic elastic material for flexibility In addition, the present invention has an effect that peeling and the like do not occur, an unnecessary stress generation is small, and a highly durable construction can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a primary construction state of a flexible segment according to the present invention.

FIG. 2 is a partially cutaway bevel view showing the assembled state.

FIG. 3 is a cross-sectional view showing a connection relationship of a flexible portion in the present invention.

FIG. 4 is an explanatory view of a cross-sectional deformation showing a molded state (a natural state in which a constraint is released) of a flexible member, an assembly state thereof, and an expansion / contraction operation state according to the present invention.

FIG. 5 is a sectional view showing a secondary lining state of the flexible segment according to the present invention.

FIG. 6 is a partially oblique view of the secondary waterproof band as viewed from the outer surface side.

FIG. 7 is a perspective view of an attached piece connecting portion of the secondary waterproof band.

8 is a sectional view of another example of the present invention in a secondary lining state similar to FIG.

FIG. 9 is a cross-sectional view showing an assembled state for a primary construction as a conventional flexible segment.

FIG. 10 is a cross-sectional view of a member mounted state for the secondary construction.

FIG. 11 is a cross-sectional view showing a completed state of the secondary lining.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible material 2 Flexible member 3 Connecting ring member 3a Side plate 4 Flexible part 5 Side ring 7 Skin plate 8 Thrust receiving bolt 9 Thrust receiving member 11 Joining end face 12 Secondary lining frame 12a Connecting material 13 Connector 14 Seal ring 15 Secondary waterproof band 16 Seal member 16a Seal portion 17 Attached piece 18 Attached plate 18a Locking claw portion 19 Mounting plate 19a Locking claw portion 20 Standard type general segment 21 Frame segment 22 Thrust Receiving material 23 Secondary lining 24 Secondary water-blocking material 25 Mounting bolt 26 Strength bar 27 Strength sleeve 28 Anchor material 29 Inner skin plate 30 Secondary lining concrete 31 Shield machine shell

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 63-108496 (JP, U) JP-A 55-70679 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/04

Claims (1)

(57) [Claims] 1. A side ring having substantially the same thickness as a general segment propelled and set in an excavation hole by receiving a thrust from a propulsion and excavation mechanism, and an outer periphery between the side ring members is provided. In the skin plate provided on the side, a chevron bend is formed in the middle toward the outer peripheral direction, and a joint end face portion parallel to both sides of the chevron bend is formed in a uniform manner, and a connection ring is formed on the joint end face portion. A flexible portion is formed by alternately assembling and connecting a plurality of flexible members which sandwich the end plate of the member and the holding plate with the connecting ring member, and a thrust receiving member is disposed inside the flexible portion. At the same time, the flexible member is set in a state of receiving a compressive force from the molding dimension, and is in a compressed state smaller than the molding dimension even during absorption of elongation, and substantially no tensile force acts. Was incorporated as Characteristic flexible segment for shield method.