JP2000145383A - Connecting construction method and joint structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the joint structure of segments, in which the segments can be connected by single operation and sufficient clamping strength is obtained in the segments covering a tunnel excavating surface. SOLUTION: In the joint structure, an insert metal fitting 1 is buried and fixed to one connecting end face of the segment, and a pin 3, in which saw-tooth working 3a is executed to a surface, is fastened to a tapped hole formed to the metal fitting 1, and an insert bracket 2 is buried and fixed to the connecting end face of another segment, a spring washer 5 is inserted into a hole formed to the metal fitting 1, a cap ring 6 is screwed and fastened into a tapped hole shaped to the metal fitting 2, the pin 3 or the spring washer 5 for the segment on the connection side is put into the spring washer 5 or the pin 3 for the existing segment, and the segment on the connection side is connected to the existing segment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a segment for covering a tunnel wall when a tunnel is constructed by a shield method.

[0002]

2. Description of the Related Art As is well known, when a tunnel is constructed by a shield method, a wall of an excavated tunnel is covered by sequentially connecting cylinders each having a predetermined length of arc-shaped segments.

[0003] Conventionally, as a method for connecting the segments, a bolt / nut method has been used in many cases.
However, in the case of the bolt and nut method, it is necessary to tighten bolts and nuts manually, which requires work in high places and in narrow places. Was.

Accordingly, for example, Japanese Patent Application Laid-Open No. 10-20528
As seen in Japanese Patent Publication No. 7, a pin is protruded from one end face (one connection face) of the segment, and the other end face (the other connection face) of the segment is made of a softer metal than the pin and having a smaller diameter than the pin. Embed the ring hardware, press-fit the segment pin to be added to the existing segment ring hardware,
A segment joint structure for connecting segments has been proposed.

[0005] According to this segment joint structure, the segment to be added is pressed against the existing segment side by a pressing means, for example, a propulsion jack provided on a shield excavator, and the pin is pressed into the ring metal fitting, thereby forming the segment. Connected.

Accordingly, the segments can be connected with one touch, and the connection time of the segments can be improved as compared with the case of the bolt and nut method. However, the segments are plastically deformed by press-fitting the pins into the ring fittings. Therefore, sufficient connection strength cannot always be obtained, and there is another problem particularly in the joint structure of a large segment.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to connect segments by a so-called one-touch operation and to obtain a joint connecting method and a joint structure capable of obtaining sufficient connection strength. The purpose is to provide.

[0008]

As a result of research and experiments, the present inventors have found that an extremely strong connection structure can be obtained by coupling a plurality of spring washers with pins having a sawtooth or threaded surface. It was found that the present invention was obtained and led to the present invention.

According to the segment connecting method of the present invention, a pin having a serrated or threaded region is protruded from an end of an insert metal buried and fixed to a connection end face of one of the segments to form a male insert metal. And a spring washer is inserted into a hole formed in the insert holder embedded and fixed to the connection end face of the other segment to be connected, and a cap ring is screwed into a region of the hole where the female screw is formed. And fixing, thereby constituting a female insert receiver, and inserting the pin of the male insert receiver of one segment into the hole of the female insert receiver of the other segment, A step of connecting both the connection-side segment and the connection-side segment to each other.

[0010] In the segment connecting method of the present invention,
Preferably, an adjustment washer is inserted into the hole of the female insert receiver, followed by a spring washer. At this time, the adjustment washer is for efficiently disposing the spring washer only in an effective range.

It is preferable that the method further includes a step of arranging a shear reinforcing bar on the outer periphery of the insert hardware or the insert receiver.

The joint structure of a segment according to the present invention is characterized in that a male insert fitting embedded and fixed to one connecting end face of the segment and a female insert embedded and fixed to the connecting end face of the other segment connected to the segment. And a pin having a serrated or threaded region at the end of the male insert, and a hole formed at the end of the female insert. The hole has a region in which a female screw is formed, a spring washer is inserted into the hole, and a cap ring is screwed and fixed to the region in which the female screw is formed. The pins of the male insert are inserted into the holes of the female insert of the other segment to connect the segments.

In the joint structure of a segment according to the present invention,
It is preferable that an adjusting washer is also inserted into a hole formed in the female insert receiver.

Preferably, the inner peripheral surface of the cap ring on the tip end side of the insert hardware is chamfered.

Further, it is preferable that a shear reinforcing bar is arranged on the outer periphery of the insert hardware or the insert receiver.

Here, the insert metal fitting and the insert metal fitting can be made of, for example, a deformed steel bar. In addition to the deformed bar, a round bar and an anchor plate may be combined, and a columnar member (case) and a small-diameter deformed reinforcing bar may be combined. In addition to this, the insert hardware can be formed by a pin anchor having a sawtooth or thread formed on a small-diameter deformed reinforcing bar.

According to the present invention having the above-described structure, the pins of the male insert hardware are inserted into the holes of the female insert hardware, so that the pins are inserted into the holes of the female hardware. The spring washer engages the saw tooth or thread (second thread) of the pin to prevent the pin from being pulled out. At this time, since the spring washer is configured to be engaged with the saw tooth, the resistance to pull-out increases as the pull-out force increases, so that inconvenience such as separation of connected segments can be reliably prevented.

Further, if the connecting side segment is pressed against the connected side segment side by a propulsion jack or the like provided on the shield excavator, the pin of the male side hardware is inserted into the hole of the female side hardware. The connection or connection of segments is performed with one touch.

In the present invention, it is preferable to insert an adjustment washer into the hole of the female insert receiving member and then insert a spring washer, which is suitable for appropriately changing the number of spring washers.

Further, if the inner peripheral surface of the tip of the cap ring is chamfered, a pin of the male metal fitting is inserted into a hole of the female metal fitting, and a saw tooth or a screw thread formed on the pin is inserted into the hole. Engaging with the arranged spring washers is even easier.

Further, it is preferable to dispose a shear reinforcing bar on the outer periphery of the insert hardware because the strength of the joint can be reinforced.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows one connecting end face A of the segment A.
-1 is indicated. An insert hardware (male side) 1 made of a deformed steel bar is embedded and fixed, and a screw hole 1a is formed in the hardware 1 as shown in FIG. 4, and a pin 3 is screwed into the screw hole 1a. Are fixed together.

As shown in FIG. 5, a normal male screw 3b (first screw thread) is machined at the base of the pin 3, and a saw tooth screw machine 3a is formed on the surface of the pin 3 over a predetermined length. Is given.

The number (length) of the serrated screws 3a is determined by the number of spring washers 5 described later. Generally, when a high tensile strength is required, the number of the serrated screws 3a is increased.

FIG. 3 shows the other connection end face A of the segment A.
2, a metal insert 2 (female side) 2 is embedded and fixed, and a hole 2a having a predetermined depth is formed in the metal fitting 2 as shown in FIG. A female screw 2b is formed on the opening side. That is, a region where the female screw is formed exists on the opening side of the hole 2a.

In the hole 2a of the insert receiver 2, FIG.
As shown in FIG. 5, the adjustment washer 4 is inserted, and then the spring washer 5 is inserted.

The spring washer 5 is composed of a plurality of spring washers 5A each having a cut portion 5a shown in FIG. 8, and the number to be inserted is appropriately selected in consideration of the size of the segments to be connected. . In the illustrated example, the inner peripheral surface 5b of the washer 5A is tapered.
At the time of connection, the structure is easy to enter and hard to remove.

It should be noted that auxiliary grooves extending radially inward from the outer periphery may be provided at a plurality of locations (not shown) to facilitate diameter expansion. As shown in FIG. 1, the spring washer 5 has a maximum diameter a when the diameter is expanded, and a margin (for example, about 3 mm) is provided for the inner diameter b of the hole 2 a of the insert receiving member 2. A misalignment due to a manufacturing error and an installation / assembly error of A is absorbed.

The adjustment washer 4 shown in FIG. 7 has an appropriate thickness in accordance with the number of spring washers 5 to be used.

As shown in FIG. 3, the cap ring 6 is screwed into the screw hole 2b of the insert holder 2, and the spring washer 5 is fixed.

The cap ring 6 is, as shown in FIG.
Male screw 6a screwed into screw hole 2b of insert receiver 2.
Are formed, and a chamfer 6b is formed on the inner peripheral surface of the distal end. By chamfering in this manner, insertion of the pin 3 into the spring washer 5 becomes easy.

With such a joint structure of segments,
To perform the segment fastening, the segment A shown in FIG. 3 is now an existing segment, and the segment A shown in FIG.
Is a segment to be newly added (connected or connected segment), when the newly added segment is pressed against the existing segment side by a propulsion jack (not shown) or the like equipped on a shield excavator, etc. The segment to be added moves to the existing segment side (male side hardware 1
3) is inserted into the spring washer 5 (inserted and arranged in the hole 2a of the female metal fitting 2). And FIG.
The spring washer 5 engages with the saw tooth 3a of the pin 3 as shown in FIG. As a result, the newly added segment is firmly fastened to the existing segment with one touch.

In this way, once the segments are fastened, the spring washer 5
More strongly engages the saw teeth 3a of the pin 3 and increases resistance to pullout forces, preventing segment separation.

In the above case, the segment 3 is moved to the spring washer 5 side of the segment, and the pin 3 is inserted into the spring washer 5 to connect the segment. The washer 5 can be moved to be inserted into the pin 3.

Although such a joint structure depends on the size of the segment, three joints are provided per piece constituting a ring (cylindrical body) of the segment. Therefore,
For example, in the case of a segment cylindrical body composed of 6 pieces, this joint structure is provided at 18 places, depending on the division shape.

In order to prevent a decrease in the strength of the segment where the joint is provided, it is preferable to dispose a shear reinforcing bar 7 on the outer periphery of the insert hardware 1 and the receiving hardware 2 as shown in FIGS.

In the illustrated embodiment, each of the insert hardware 1 and the insert receiving hardware 2 is configured as a deformed steel bar anchor made of a deformed steel bar, but the present invention is not limited to this.

For example, as shown in FIG. 12, it is also possible to compose the insert hardware 1 by combining the anchor plate 20 and the round steel 22, and attach the pin 3 thereto.

Alternatively, as shown in FIG.
4 and the deformed reinforcing bar 26 in combination with the deformed reinforcing bar 26 having a small diameter.
May be attached.

Further, as shown in FIG.
It is also possible to integrally form the pin 3 on which the saw tooth 3a is formed as a pin anchor, thereby forming the male insert 1.

In the illustrated embodiment, the male insert metal pin 3 is formed with a saw tooth 3a. Instead of the saw tooth, a screw thread (second screw thread) is formed.
The (second) thread can be configured to engage with the spring washer 5.

As described above, the pin 3 is replaced with the second tooth instead of the sawtooth 3a.
In the case where the screw thread is formed, the second screw thread and the spring washer 5 inserted and arranged in the hole 2a of the female insert holder 2 are engaged. An effect can be obtained.

FIGS. 15 to 18 show another embodiment of the insert receiving member. FIG. 15 shows an embodiment in which a large-diameter deformed reinforcing bar 31 is welded to the tip portion 2A of the insert receiving member, and FIG. 16 shows a round bar 33 in which an anchor plate 34 is welded to the other end of the tip portion 2A. FIG. 17 shows an embodiment in which a plurality of small-diameter deformed reinforcing bars 31 are welded to the tip portion 2A, and FIG. 18 shows an anchor plate 36 attached to the other end of the round bar 35.
Are formed respectively by welding.

FIGS. 19 to 21 show another embodiment of the spring washer. In the embodiment shown in FIG. 19, thick spring washers 5l and thin spring washers 5S are alternately inserted and positively restrained from deforming the washers outward. In the embodiment shown in FIG. 20, the spacer 11 is inserted around the outer periphery of the washer 5, and the washer 5 and the cap ring 6 are attached.
Between the support ring 12 and the adjustment washer 4,
A gap δ is provided between the outer diameter of the spacer 11 and the bearing ring 12 and the inner diameter of the hole 2 a so that even when the pin 3 is inserted, misalignment with the hole 2 a can be absorbed. FIG.
As shown in FIG. 1, even if there is misalignment, the spring isher 5 is movable in the radial direction, and suppresses the deformation of the spring washer 5 in the out-of-plane direction.

It should be noted that the illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention.

[0047]

According to the present invention, when the pin is inserted into the spring washer, the spring washer engages with the saw tooth or the (second) thread of the pin to prevent the pin from being pulled out. Then, the connection (connection) state is maintained extremely strongly.

Further, by pushing the segment to be added to the existing segment side by a propulsion jack or the like provided on the shield excavator, the pin of the male metal fitting is inserted into the hole of the female metal fitting, and the saw blade of the pin or ( Since the (second) thread and the spring washer are engaged, the segments are connected with one touch, and the segments can be efficiently assembled in a short time.

Also, in the hole formed in the insert receiving member,
By inserting an adjustment washer, the number of spring washers can be changed as appropriate.

Further, by chamfering the inner peripheral surface of the tip of the cap ring for fixing the spring washer, it becomes easy to insert the pin into the spring washer.

In addition, by arranging the shear reinforcement on the outer peripheral surface of the insert hardware, the strength of the joint portion can be reinforced.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a part of a fastening state of a joint structure of a segment according to an embodiment of the present invention.

FIG. 2 is a side view showing a cross section of a part of a segment embedded in an insert hardware (male side).

FIG. 3 is a side view showing a cross section of a part of a segment embedded in the insert receiving member (female side).

FIG. 4 is a side view showing a part of the insert hardware (male side) in cross section.

FIG. 5 is a side view of a pin.

FIG. 6 is a side view showing a part of the insert receiving member (female side) in cross section.

FIG. 7 is a side sectional view of an adjustment washer.

FIG. 8 is a side sectional view and a plan view of a spring washer.

FIG. 9 is a side sectional view of the cap ring.

FIG. 10 is a side view showing a cross section of a part in which a shear reinforcing bar is arranged in a segment in which an insert hardware (male side) is embedded.

FIG. 11 is a side view showing, in cross section, a part in which a shear reinforcing bar is arranged in a segment in which an insert receiving member (female side) is embedded.

FIG. 12 is a sectional view showing another configuration of the insert hardware.

FIG. 13 is a sectional view showing still another configuration of the insert hardware.

FIG. 14 is a sectional view showing another configuration of the insert hardware.

FIG. 15 is a sectional view showing another configuration of the insert receiver.

FIG. 16 is a sectional view showing still another configuration of the insert receiver.

FIG. 17 is a sectional view showing another configuration of the insert receiver.

FIG. 18 is a sectional view showing still another configuration of the insert receiver.

FIG. 19 is a sectional view showing another configuration of the spring washer.

FIG. 20 is a sectional view showing still another configuration of the spring washer.

FIG. 21 is a cross-sectional view showing a case where the center is shifted with respect to FIG. 20;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insert hardware (male side) 1a ... Screw hole (female screw) 2 ... Insert receiving hardware (female side) 2a ... Hole 2b ... Female screw 3 ... Pin 3a ...・ Sawtooth processing 3b ・ ・ ・ (first) male screw 4 ・ ・ ・ Adjustment washer 5 ・ ・ ・ Spring washer 5a ・ ・ ・ Opening 6 ・ ・ ・ Cap ring 6a ・ ・ ・ Male screw 6b ・ ・ ・ Chamfer 7 ... Shear reinforcement

Continued on the front page (72) Inventor: Masashi Yamamoto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor: Yutaka Fujino 4-2-2, Shiba, Minato-ku, Tokyo GeoStar Co., Ltd. (72) Inventor Yasushi Sakuma 2-3-2 Shiba, Minato-ku, Tokyo Geostar Co., Ltd. F-term (reference) 2D055 GC04

Claims (7)

[Claims] A step of projecting a pin having a serrated or threaded region at an end of an insert fitting embedded and fixed to a connection end face of one of the segments to form a male insert fitting; A spring washer is inserted into a hole formed in an insert holder embedded and fixed to the connection end face of the other segment to be connected, and a cap ring is screwed and fixed to a region of the hole where an internal thread is formed, whereby And forming the female insert insert by inserting the pins of the male insert of one segment into the holes of the female insert of the other segment. And a step of connecting both connection side segments to each other. 2. The segment connecting method according to claim 1, wherein an adjusting washer is inserted into the hole of the female insert receiving member, and then a spring washer is inserted. 3. The segment connecting method according to claim 1, further comprising the step of arranging a shear reinforcing bar on an outer periphery of the insert metal fitting or the insert receiving metal. 4. A male insert metal fitting embedded and fixed to one connection end face of a segment, and a female insert metal fitting embedded and fixed to a connection end face of another segment connected to the segment, A pin having a serrated or threaded area is projected from the end of the male insert, and a hole is formed at the end of the female insert, and the hole is formed in the hole. In addition to having a region where a female screw is formed, a spring washer is inserted into the hole, and a cap ring is screwed and fixed to the region where the female screw is formed. A segment joint structure wherein the pins are inserted into the holes of the female insert holder of the other segment to connect the segments. 5. The segment joint structure according to claim 4, wherein an adjusting washer is inserted into a hole formed in the female insert receiving member. 6. The joint structure for a segment according to claim 4, wherein an inner peripheral surface of the cap ring on a tip end side of the insert hardware is chamfered. 7. The joint structure for a segment according to claim 4, wherein a shear reinforcing bar is arranged on an outer periphery of the insert hardware or the insert receiver.