JP3538804B2 - Shield jack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield jack for obtaining the excavation power of a shield machine by pressing a segment immediately after assembly at a shield tail portion of the shield machine.

[0002]

2. Description of the Related Art As a conventional shield jack of this type, a front view (FIG. 6A) and a plan view (FIG.
As shown in (b)), the segment 1 immediately after assembly
01 has a spreader 103 at its rear end where the rotation of the contact surface T that contacts the front end surface Z is secured by the universal joint 102, and is disposed at appropriate intervals in the circumferential direction of the shield tail portion 104. According to this, it is possible to always appropriately secure the contact angle of the spreader 103 with respect to the front end surface Z of the segment 101 by the universal joint 102 regardless of the degree of the curve of the tunnel. .

[0003]

However, this type of shield jack has the following problems since the universal joint 102 is used.

[0004] One is that in the excavation of the shield machine, when the segment 101 is to be pressed by the shield jack, the spreader 103 rotates around the normal H to the state shown in FIG. That is, the contact area of the spreader 103 is reduced and the front end of the segment 101 is damaged. Such damage can be a structural defect as a shield tunnel, and even if there is no damage enough to cause a defect, it greatly affects the water stoppage of the shield tunnel after the start of operation.

In particular, in the shield construction method in which the waterproof sheet 105 is installed prior to the assembly of the segments 101, the spreader 103 rotates around the normal line H to the state shown in FIG. The spreader 1
Due to 03, the waterproof sheet 105 laid earlier is easily damaged or the like.

[0006] Another is that the spreader 103 is attached to the front end surface Z of the segment 101 after the assembly of the segment 101.
In case of contact from spaced state from the action of the rotation of the shield machine, as parallelism between the contact surface T of the front end face Z and spreader 103 segment 101 is in the state shown in FIG. 6 (b) When the spreader 103 is largely disintegrated, the front end face Z of the segment 101 is damaged as a result of causing a lateral displacement in the front end face Z of the segment 101 until the end of the spreader 103 receives the contact rear face. It is. Such damage has a great effect on the water stoppage of the shield tunnel after the start of operation, even if it is slight.

SUMMARY OF THE INVENTION It is an object of the present invention to reliably prevent damage to the front end of a segment due to a reduction in the contact area of the spreader and damage to the front end of the segment due to lateral displacement of the end of the spreader. To provide a shield jack.

[0008]

In order to achieve the above object, a shield jack according to the present invention is provided with a spreader in which rotation of a contact surface abutting a front end surface of a segment after assembly is secured by a universal joint. At the rear end, and in a shield jack arranged at appropriate intervals in the circumferential direction of the shield tail, adjacent ones of a plurality of spreaders arbitrarily selected according to the assignment of the segments. by coupling it is characterized by comprising a spreader restraining means for restraining rotation of the abutment surface of the front Symbol spreader.

That is, the present invention provides a conventional shield jack in which rotation of a contact surface with respect to a front end surface of a segment is secured by a universal joint, and further, by connecting spreaders adjacent to each other, By providing the spreader restraining means for restraining the rotation of the abutment surface, it is possible to reliably prevent damage to the front end of the segment due to a decrease in the abutment area of the spreader and damage to the front end surface of the segment due to lateral displacement of the end of the spreader. It is possible to prevent it.

In such technical means, "according to the assignment of the segments" means not only the case where the spreader to be connected is selected according to the arrangement of the pieces of the segment but also the arrangement of the steel material in the segment. The case where the spreader to be connected is selected is also included.

[0011] Further, the connecting operation and the like can be performed more easily and quickly.
From the perspective of trying to do this, the spreader constraint
The means includes a connecting rod having a hole in each of the portions related to both ends,
Holes are drilled corresponding to the holes of the connecting rod, and
A pair of ribs attached to the predder and the connecting rod
And the connecting rod and the hole of the pair of ribs.
Joining means for joining the pair of ribs.
preferable.

In this case, as the joining means,
Must be able to join connecting rods and ribs
It does not matter whether it is a rigid joint or not. For example, Bol
In addition to the joining method using nuts and nuts,
A hole-type joining method is also included.

[0013] The hole of the connecting rod may be the connecting rod.
It is only necessary to be within the range where the rod and rib can be joined.
Of spreaders to be connected according to the assignment of
If replacement is necessary, remove the connecting rod each time.
From the viewpoint of trying to avoid the trouble of removing
If at least one is in the longitudinal direction of the connecting rod
It is preferably a long slot.

Further, as the spreader restraining means,
Is to connect the spreaders that are next to each other
Which can restrict the rotation of each of the spreaders.
If so, what kind of consolidation method, configuration, etc. should be used?
I do not know, but it is easier and faster to connect and disconnect
From the viewpoint of trying to perform the work, the connecting member,
At least a portion related to one end of the connecting member is slidable.
By fitting, rotation of the contact surface of the spreader
And is provided integrally with the spreader.
A rotation restraining member, wherein the connecting member is engaged at both ends.
A concave portion is formed in
The material is fitted with a portion related to at least one end of the connecting member.
The concave portion is urged by an elastic force.
It is preferable to have a convex member to be fitted to
No.

In this case, the concave portion of the connecting member
The range in which the rotation of the spreader can be
If it is in the box, connect according to the assignment of the segment
If you need to change the spreader,
Avoid the trouble of removing the connecting member each time
From the perspective of trying to do so, at least one is
It is preferable that the area is larger than the contact area of the convex member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings.

First Embodiment FIG. 1 is a side view and a front view schematically showing a shield machine to which a shield jack according to a first embodiment is applied. In the figure, reference numeral 1 denotes a shield tail portion of a shield machine that excavates a shield tunnel, which has a double tail seal 1a that prevents intrusion of groundwater and the like into the inside over the entire periphery of a rear end portion, Sign 2
Is a segment made of reinforced concrete which is assembled sequentially for each ring in the shield tail portion 1 and supports the ground after passing through the shield tail portion 1;
Is wrapped around the outer periphery of the segment 2 to be assembled next in the shield tail portion 1 and achieves complete prevention of water leakage into the shield tunnel.
Is shown.

Reference numeral 4 is disposed at appropriate intervals in the circumferential direction of the shield tail portion 1, and the front end face Z of the segment 2 is provided.
A shield jack for applying a pressing force to the shield machine to obtain the excavating force of the shield machine, and a reference numeral 5 denotes a waterproof sheet winding device for welding and winding the waterproof sheet 3 to the outer peripheral portion of the segment 2 to be assembled next. Reference numeral 6 denotes an erector that assembles the segments 2 inside the waterproof sheet 3 previously wound by the waterproof sheet winding apparatus 5.

Shield jack 4 according to the first embodiment
2 is a plan view of FIG. 2 and a side view of FIG. 3 (a view in the direction of arrow A in FIG. 2A) and a front view (B in FIG. 2A).
As shown in a direction arrow), the universal joint 11 ensures rotation of the contact surface T that contacts the front end surface Z of the assembled segment 2 at the rear end portion. The spreader 12 includes a plate-like member 12a including the pair of ribs 12b for reinforcing the plate-like member 12a.

Further, the shield jack 4 connects the mutually adjacent ones of the plurality of spreaders 12 arbitrarily selected in accordance with the allocation of the segments 2 so that each contact surface of the plurality of spreaders 12 is connected. T was constrained on the front end surface Z substantially parallel to one plane of the segment 2, and comprises a spreader restraining means 13 for restraining the <br/> rotation abutment surface T of the previous SL plurality of spreader 12 ing.

The spreader restraining means 13 according to the first embodiment includes a connecting rod 13b having holes 13a at both ends thereof, and a pair of holes having holes corresponding to the holes 13a of the connecting rod 13b. Rib 12b and the connecting rod 1
Bolts and nuts 13d as joining means for joining the connecting rod 13b and the pair of ribs 12b using the hole 13a of the pair 3b and the hole of the pair of ribs 12b, and the pair of ribs 1
And a piece member 13e for filling a gap between the hole 2b and the outside of the hole 13a.

The hole 13a of the connecting rod 13b is formed as a long hole that is long at both ends in the longitudinal direction of the connecting rod 13b. The reason for adopting such a configuration is that when connection is not necessary due to the allocation of the segments 2, the connection rod 13b and the bolts and nuts 13d need to be completely removed by using as shown in FIG. This is intended to reduce the burden on the worker.

Next, the operation of the shield jack 4 according to the first embodiment will be described with reference to FIGS. still,
In FIG. 1, reference numeral 5a denotes a swivel ring which is provided to be able to freely turn with respect to the shield tail portion 1, and reference numeral 5b denotes
Is a waterproof sheet winding arm for gripping an end of the waterproof sheet 3 housed in a roll shape in a roll support bracket (not shown) integral with the shield portion, and includes a turning ring 5a.
Reference numeral 5c designates a welding machine traveling guide provided in a ring shape close to the inside of the wrap portion of the existing waterproof sheet 3 and the new waterproof sheet 3, and reference numeral 5d designates a welding machine traveling guide 5c. This is a self-propelled welding machine that welds the lap portion while traveling along. These are all components of the waterproof sheet winding device 5 together with the roll support bracket.

(1) Operation at the time of extending the shield jack 4 First, before assembling a new segment 2, the waterproof sheet 3 is wound and welded by the waterproof sheet winding device 5.

That is, when the swivel ring 5a turns, the waterproof sheet 3 held by the roll-up arm 5b integral with the swivel ring 5a and housed in a roll shape in a roll support bracket integral with the shield part. Are sequentially pulled out and laid along the inner peripheral surface of the shield tail portion 1. At this time, an overlap portion for welding is secured between the newly installed waterproof sheet 3 and the existing waterproof sheet 3.

Subsequently, following the turning of the turning ring 5a, the self-propelled welding machine 5d clamps the overlapped portion of the waterproof sheet 3 and performs a welding operation while self-propelled on the welding machine running guide 5c.

Thereafter, the segment 2 by the erector 6
Is completed, and when this is completed, the shield jack 4 is extended as described below.

First, as a preparatory work, a connecting rod 13 straddled between two shield jacks 4 adjacent to each other.
The bolt and the nut 13d according to b are tightened,
The contact surface T of the spreader 12 is set substantially parallel to the front end surface Z of the segment 2.

In such a state, the two shield jacks 4 are stretched at substantially the same timing and at substantially the same speed.

During this stretching, the two shield jacks 4 are in a mutually restricted state shown in FIG. 2 (a). That is, each contact surface T of the two spreaders 12
There have been constrained on the front end surface Z substantially parallel to one plane of the segments 2 and the abutment surface before SL second spreader 12
The rotation of T is restricted.

Finally, the entire contact surface T of the spreader 12 contacts the front end surface Z of the segment 2 almost simultaneously while maintaining substantially parallelism with the front end surface Z of the segment 2. In the first embodiment, while the shield jacks 4 are being extended, even if the timing or speed of extension of each shield jack 4 is deviated, the restrained state is maintained. .

Therefore, according to the first embodiment, the front end surface Z of the segment 2 is damaged by lateral displacement on the front end surface Z of the segment 2 until the end of the spreader 12 is received by the contact rear surface. The situation can be reliably avoided, and the water stoppage of the shield tunnel after the start of operation can be improved.

(2) When the shield jack 4 is pressed, the contact surface T of the action spreader 12 is set to the front end surface Z of the segment 2.
, And a state in which a pressing force is applied to the segment 2 of the shield jack 4 will be described.

In such a state, the spreader 1
When an external force is applied by the rotation of the shield machine in tunneling to 2, the abutment surface T of the spreader 12, tries to motion corresponding to those external forces.

However, the frictional force between the members by the connecting rod 13b as a structural member and the bolts and nuts 13d sufficiently resists the external force. As a result, each contact surface T of the two spreaders 12 becomes the front end surface Z substantially segments 2 are constrained on parallel one plane, and, before Symbol for rotation is also constrained abutment surface T of the two spreader 12, the contact state while maintaining segment 2 Only slides on the front end surface Z.

Therefore, according to the first embodiment, FIG.
Since the state shown in (a) does not occur, it is possible to reliably avoid a situation in which the front end of the segment 2 is damaged due to a decrease in the contact area of the spreader 12, and thus a structural defect as a shield tunnel is completely eliminated. Thus, the effect of improving the water stopping performance of the shield tunnel after the start of operation can be obtained.

When the shield construction method of laying the waterproof sheet 3 prior to assembling the segments 2 is employed as in the first embodiment, the waterproof sheet 3 laid in advance is used. The effect of reliably avoiding damage or the like by the spreader 12 is particularly large.

Second Embodiment FIG. 4 is a plan view schematically showing a shield jack according to a second embodiment of the present invention, and FIG. 5A is a front view schematically showing the shield jack (FIG. FIG. Note that components similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

The shield jack 4 according to the second embodiment is substantially the same as the first embodiment, except that the spreader restraining means 13 of the first embodiment is replaced with a spreader restraint having a different configuration from the first embodiment. Means 23 is employed.

That is, the spreader restraining means 23 according to the second embodiment comprises a connecting rod 23a serving as a connecting member and a portion at both ends of the connecting rod 23a, which are slidably fitted to each other. The rotation restricting member 23b for restricting rotation is provided integrally with the spreader 12.

The connecting rod 23a has concave portions 23c formed on both sides of a portion related to both ends, and the rotation restricting member 23b is used when the portions related to both ends of the connecting rod 23a are fitted. It has a convex member 23d to be fitted into the concave portion 23c, which is urged by an elastic force. In the second embodiment, the spring 23e is used as a means for urging the elastic force against the convex member 23d.
Is used.

Therefore, according to the shield jack 4 according to the second embodiment, in addition to the effects obtained in the first embodiment, the operation of tightening or loosening the bolts or the like, that is, the operation of using tools is unnecessary. As a result, the operator can directly remove the connecting rod 23a with his / her own hand, and the first embodiment is performed.
It is even more advantageous than.

In the second embodiment, as the spreader restraining means 23, one including the connecting rod 23a separated from the spreader 12 is adopted, but the present invention is not limited to this.

Therefore, for example, as shown in FIG. 5B, a protruding member 33a fixed to one spreader 12 and an integral part of the other spreader on which the protruding member 33a is fitted are provided. Spreader restraining means 33 including a rotation restraining member 33b may be employed (including a concave portion 33c and a convex member 33d having substantially the same configuration as in the second embodiment).

[0045]

According to the shield jack according to the present invention, as described above, the front end of the segment is broken due to a decrease in the contact area of the spreader, and the front end of the segment is caused by a lateral displacement of the end of the spreader. Surface damage can be reliably prevented.

Also, if the shield jack is applied to a shield construction method of laying a waterproof sheet prior to assembling the segments, it is possible to reliably avoid damage to the previously laid waterproof sheet by a spreader. A remarkable effect will be obtained.

[Brief description of the drawings]

FIG. 1 is a side view and a front view schematically showing a shield machine to which a shield jack according to an embodiment of the present invention is applied.

FIG. 2 is a plan view schematically showing a shield jack according to Embodiment 1 of the present invention.

FIG. 3 is a side view schematically showing the shield jack according to the first embodiment of the present invention (viewed in the direction of arrow A in FIG. 2A) and a front view thereof (viewed in the direction of arrow B in FIG. 2A). It is.

FIG. 4 is a plan view schematically showing a shield jack according to Embodiment 2 of the present invention.

FIG. 5 is a front view schematically showing a shield jack according to Embodiment 2 of the present invention (a view in the direction of arrow A in FIG. 4A).

FIG. 6 is a front view and a plan view schematically showing a conventional shield jack.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield tail part 1a ... Tail seal 2 ... Segment 3 ... Waterproof sheet 4 ... Shield jack 5 ... Waterproof sheet winding device 5a ... Swirl ring 5b ... Waterproof Sheet winding arm 5c welding machine traveling guide 5d self-propelled welding machine 6 erector 11 universal joint 12 spreader 12a plate member 12b Rib 13 Spreader restraining means 13a Hole 13b Connecting rod 13d Bolt and nut 13e Piece member 23 Spreader restraining means 23a Connecting rod 23b Rotation Restriction member 23c: concave portion 23d: convex member 23e: spring 33: spreader restricting means 33a: connecting rod 33b: rotation restricting member 33c: concave portion 33d: convex Material 101 ... segment 102 ... universal joint 103 ... spreader 104 ... shield tails 105 ... tarpaulin T ... abutment surface Z ... front face H ... normal

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Sakae 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Yukio Haga 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Construction Co., Ltd. (72) Inventor Seiji Abe 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Shuichi Hara 1534 Yotsu-cho, Nasu-cho, Nasu-gun, Tochigi -1 Goyo Construction Co., Ltd. (72) Inventor Hiroyuki Matsufuji 1534-1, Nasu-cho, Nasu-machi, Tochigi Pref., Japan (72) Inventor (72) Inventor Yukihisa Hirasawa 2-6-Otemachi, Chiyoda-ku, Tokyo No. 2 Hitachi Construction Machinery Co., Ltd. (72) Nobuyuki Maehara, Inventor No. 2-6-2, Otemachi, Chiyoda-ku, Tokyo Hitachi Construction Machinery Co., Ltd. (72) Inventor, Yoshiharu Sakagami 2--16, Kabukicho, Shinjuku-ku, Tokyo No. 9 The sum Kiko Co., Ltd. (56) Reference Patent flat 7-180478 (JP, A) JitsuHiraku flat 3-42892 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) E21D 9 / 06 302

Claims (5)

(57) [Claims] 1. A spreader secured at its rear end by a universal joint to rotate the contact surface that contacts the front end surface of the assembled segment, and at appropriate intervals in the circumferential direction of the shield tail portion. in disposed shield jacks, by linking the adjacent groups from one another of a plurality of spreader arbitrarily selected in accordance with the allocation of the segment, spreader restraining means for restraining rotation of the abutment surface of the front Symbol spreader A shield jack comprising: 2. A spreader restraining means, comprising: a connecting rod having holes at respective portions at both ends; and a hole corresponding to the hole of the connecting rod, and a pair of holes attached to the spreader . by using the rib, the hole and the pair of ribs of the hole of the connecting rod, and joining means for joining the connecting rod and the pair of ribs, characterized in that it consists, shield jack according to claim 1 . 3. The shield jack according to claim 2 , wherein at least one of the holes of the connecting rod is a long hole elongated in a longitudinal direction of the connecting rod. Wherein said spreader restraining means includes a coupling member, by slidably fitted on a portion relating to the at least one end of the connecting member, and restraining the rotation of the abutment surface of the spreader, the Provided integrally with the spreader
A rotation restricting member , wherein the connecting member has a concave portion formed at a portion at both ends, and the rotation restricting member has an elasticity when a portion at least at one end of the connecting member is fitted. Biased by force
Characterized by comprising a convex member to be fitted in the recess, the shield jacks according to claim 1. 5. The shield jack according to claim 4 , wherein at least one of the concave portions of the connecting member is larger than a contact area of the convex member.