JPH08210095A - Joint device of segment - Google Patents

Abstract

PURPOSE: To easily make a tight connection by absorbing the tolerance of the position where a female connecting member connects to a male connecting member. CONSTITUTION: In a joint device of a segment in which a plurality of wedge plates are freely movably mounted in taper holes provided in the casing of a female connecting member with the inner peripheral surfaces of the wedge plates being tapered while a male connecting member 3 for insertion into the inner peripheries of the conical wedge panels are inserted into the inner peripheries of the wedge plates so that the male connecting member 3 is unreleasably locked by wedge action with the locking portion 3b of the male connecting member 3 closely held by the inner peripheral surfaces of the wedge plates, an externally threaded portion 3d projected from the rear end of the male connecting member 3 is driven into a nut 20 buried in the rear end of the segment 1, and an externally threaded portion 24 at the end of an anchor rod 23 is driven into the rear end of the nut 20. A bearing plate 27 fitted in the front of the anchor rod 23 is locked by a nut 26 fitted around an externally threaded portion 25 provided at the rear end of the anchor rod 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for a concrete segment used for the primary lining of a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, a taper hole whose inner diameter increases from the front end side to the rear end is provided on the inner circumference of the front end portion of a cylindrical casing which is embedded by exposing the front end surface on one of the front and rear end portions of a segment. A conical cylinder formed by following the inner peripheral surface of the tapered hole by providing a female screw at least on the inner periphery of the rear end of the cavity formed in series behind the hole and providing a receiving port on the tip side of the tapered hole. A wedge plate group formed by dividing the body into a plurality of parts in the circumferential direction is formed into a conical cylinder shape in the tapered hole, and the inner peripheral surface of the conical cylinder wedge plate group extends from the front end side to the rear side. It is arranged in a taper shape so that the inner diameter expands, and a male screw portion provided at the end of the anchor is screwed into the female screw of the hollow portion, and the male screw portion and the rear end of the wedge plate are attached. Female type coupling with a compression spring interposed between the spring seat and At the back of the material and the pointed guide portion at the tip, a locking portion having a tapered surface that follows the inner peripheral surface of the wedge-shaped group of conical cylinders is provided. Positioning that allows close fitting A tight fitting part is provided, a male screw part is provided further behind it, and a box-shaped fixing with a box removal part inside with the tip surface exposed at the other end of the segment is embedded There is known a segment joint device including a male connecting member in which the male screw portion is inserted into a through hole provided in a tip end surface of a metal fitting and fastened and fixed with a nut (Japanese Patent Laid-Open No. 6-146).
794).

[0003]

In the above-mentioned conventional joint device, the male connecting member has the male screw portion at the base end thereof, and the box-pulling portion is provided inside by embedding the tip end surface at the other end of the segment. Since the box-shaped fixing metal having a box is fastened and fixed by a nut to the tip surface, the box-excluding fixing metal is exposed on the inner surface of the shield tunnel, impairing the appearance and requiring corrosion prevention treatment.

Further, since the male connecting member is fixed to the fixing member, the female connecting member and the male connecting member are connected due to an assembly error of the segment or an installation position error of the female connecting member and the male connecting member. There is a problem that the male connecting member cannot be inserted into the female connecting member when the position is displaced.

[0005]

According to the present invention, a plurality of groups of wedge plates 9 are movably arranged in a tapered hole 5 provided in a casing 4 of a female connecting member 2 so as to form a conical cylinder shape. The inner peripheral surface of the wedge plate 9 group is tapered so that the inner diameter increases from the tip side to the rear side, and the male type connecting member 3 to be inserted into the inner peripheral portion of the conical cylindrical wedge plate 9 group is attached to the tip. Is formed in the shape of a protrusion provided with a locking portion 3b having a tapered surface following the inner peripheral surface of the conical cylindrical wedge plate 9 group behind the sharpened guide portion 3a, and the male connecting member 3 is wedged. By inserting into the inner peripheral portion of the plate 9 group, the locking portion 3b of the male connecting member 3 is tightly held by the inner peripheral surface of the wedge plate 9 group and the male connecting member 3 by the wedge action.
In a segment joint device which is locked so that it cannot be pulled out, a male screw portion 3d protruding from the rear end of the male connecting member 3 is embedded in the rear end portion of the segment 1 by exposing a tip screw hole opening. The nut 20 has a cushion layer 21 coated on the outer periphery thereof, and a male screw portion 24 at the tip of an anchor rod 23 having the cushion layer 22 coated on the outer periphery of the nut 20 is screwed into the nut 20. A bearing plate 27 inserted into the front part of a nut 26 screwed into a male screw part 25 provided at the rear end of the anchor rod 23.
The present invention proposes a joint device for a segment in which is locked.

Further, according to the present invention, a plurality of wedge plates 9 are movably arranged in a tapered hole 5 provided in the casing 4 of the female connecting member 2 so as to form a conical cylinder shape. The inner peripheral surface is tapered so that the inner diameter increases from the tip side to the rear side, and the male connecting member 3 to be inserted into the inner peripheral portion of the conical cylindrical wedge plate 9 group is guided with a sharp tip. Part 3
The male connecting member 3 is formed in the shape of a protrusion provided with a locking portion 3b having a tapered surface following the inner peripheral surface of the wedge plate 9 group having a conical cylindrical shape, and the male connecting member 3 is formed on the inner periphery of the wedge plate 9 group. By inserting it into the portion, the locking portion 3b of the male connecting member 3 is tightly held by the inner peripheral surface of the wedge plate 9 group, and the male connecting member 3 is locked by the wedge action so that it cannot be pulled out. In the joint device of the segment, a male screw portion 3d protruding from the rear end of the male connecting member 3 is provided.
Is screwed into a nut 20 which is embedded in the rear end portion of the segment 1 so as to expose a tip screw hole opening. The nut 20 is covered with a cushion layer 21 on the outer periphery and a cushion layer 22 on the outer periphery at the rear end. The male screw portion 24 at the tip of the anchor rod 23 is screwed in, and the anchor rod 23 is curved so that the male screw portion 25 at the rear end thereof is projected from the fixing surface of the fixing recess 30 provided on the inner surface of the segment 1. The pressure bearing plate 27 abutting on this fixing surface is the male screw portion 25.
The present invention proposes a joint device for a segment that is fastened with a nut 26 screwed in.

[0007]

When the guide portion 3a of the male connecting member 3 is inserted into the inner peripheral portion of the wedge plate 9 group from the receiving port 8 of the female connecting member 2, the guide portion 3a has a conical cylindrical wedge plate 9 group. Since it gradually becomes larger than the small diameter portion on the tip side of the inner peripheral surface of, the wedge plate 9 is pushed outward by the taper surface of the guide portion 3a against the elastic force of the compression spring 19 while expanding each wedge plate 9 to the outer peripheral side. When the maximum diameter portion of the base end of the guide portion 3a is inserted into the inner peripheral portion of the wedge plate 9 having the conical tubular shape, the locking portion 3b gradually decreases its diameter toward the rear side thereof. 9 is pushed back by the compression spring 19 and retracts along the tapered hole 5 while contracting to the inner peripheral side,
The inner peripheral surface tightly holds the locking portion 3b of the male connecting member 3 and locks the male connecting member 3 so as not to slip out by the wedge action.

On the other hand, in this state, the segments 1, 1
Since the cushion layers 21 around the nut 20 into which the male connecting member 3 is screwed in and the cushion layer 22 around the anchor rod 23 can be compressed and deformed while being closely joined to each other, the deformation allowable range thereof. In this case, the male connecting member 3 can be displaced in the direction of the end face of the segment 1, and as a result, due to an assembly error of the segment or an installation position error of the female connecting member 2 and the male connecting member 3, the male connecting member 2 and Even if the connecting position of the male connecting member 3 is deviated, these errors can be absorbed and the connecting can be done reliably and reliably.

Further, when a tensile force is generated between the front and rear segments 1 and 1 due to an earthquake or the like after the assembling of the segments, the anchor rod 12 at the rear of the female connecting member 2 is made into the concrete of the segment 1 by the cushion layer 22. Since the edges are cut off, it is possible to secure the deformation followability in the axial direction by the elongation.

The anchor rod 23 of the male connecting member 3 is curved so that its rear end projects from the fixing surface 31 of the fixing recess 30 provided on the inner surface of the segment 1, and the pressure plate 27 abutting on the fixing surface 31 is attached. By tightening with the nut 26 screwed into the male screw portion 25, prestress is introduced into the concrete around the anchor rod 23, and the concrete in this portion can be strengthened.

[0011]

EXAMPLE As shown in FIG. 4, a female connecting member 2 is provided at the front end of a concrete segment 1 and a male connecting member 3 is provided at the rear end thereof at positions corresponding to each other in the front-rear direction.

As shown in FIG. 2, the casing 4 constituting the outer shell of the female connecting member 2 is embedded in the segment 1 so as to expose only the front end surface, and the inner periphery of the front end portion extends from the front end side to the rear side. The taper hole 5 that gradually expands is formed, and the female screw 7 is formed at least on the inner periphery of the rear end of the cavity 6 formed in series behind the taper hole 5. Are formed.

As shown in FIG. 2, in the tapered hole 5, a group of wedge plates 9 formed by circumferentially dividing a conical cylindrical body formed along the inner peripheral surface thereof into a plurality of parts is formed. The inner peripheral surface of the conical cylinder formed by these wedge plates 9 has an inner diameter that increases from the front end side to the rear side similarly to the tapered hole 5. Is formed on the taper surface.

The female screw 7 at the rear end of the cavity 6 has a screw plug 1
0 is screwed in, and a male threaded portion 11 protruding from the rear end face thereof and a male threaded portion 13 provided at the tip of the anchor rod 12 are connected by a nut 14, and a male threaded portion is provided at the rear end of the anchor rod 12. 15 is provided, and the bearing plate 1 is fitted into the front portion of the male screw portion 15 by a nut 16 screwed into the male screw portion 15.
7 is locked.

A compression spring 19 for elastically pressing the wedge plate 9 in the direction of the small diameter portion of the tapered hole 5 is interposed between the screw plug 10 and the spring seat 18 abutting on the rear end of the wedge plate 9. ing.

As shown in FIG. 1, the male connecting member 3 follows the cylindrical inner peripheral surface formed by the sharp guide portion 3a at the tip and the plurality of wedge plates 9 located behind the guide portion 3a. The locking portion 3b having a tapered surface, the base portion 3c located at the rear of the locking portion 3b, which can be fitted into the receiving port 8, and the male screw portion 3d protruding from the rear of the base portion 3c, the male screw portion 3d. Is exposed at the rear end portion of the segment 1 and is screwed into the embedded nut 20 so as to project from the rear end surface of the segment 1.

The nut 20 is covered with a cushion layer 21 made of rubber or soft synthetic resin on the outer periphery thereof, and has a cushion layer 22 made of rubber or soft synthetic resin on the outer periphery at the rear end.
A male threaded portion 24 provided at the tip of an anchor rod 23 covering is covered with a male threaded portion 25 provided at the rear end of the anchor rod 23, and a nut 26 screwed into the male threaded portion 25 Bearing plate 2 inserted in the front part
7 is locked.

Further, as shown in FIG. 5, a cotter bracket 28 having a C-shaped cross section is provided at the side end of the segment 1 in the ring direction.
Are fixed by being embedded and are adjacent to each other in the ring direction 1,
By pressing a wedge-shaped cotter having an H-shaped cross section into the cotter brackets 28, 28 that are in contact with each other from the inner side of the ring,
The segments 1 and 1 in the ring direction are fastened and integrated with each other.

On the end face of the segment 1 around the male connecting member 3, a water stop seal 29 composed of an O-ring or the like is attached. With this water stop seal 29, after connecting the segments 1 and 1, the female connection is established. Water is prevented from entering between the member 2 and the male connecting member 3 to prevent rust and corrosion.

In the embodiment shown in FIG. 4, the anchor rod 23 of the male connecting member 3 is curved to form a male screw portion 25 at the rear end.
Is protruded from the fixing surface 31 of the fixing concave portion 30 provided on the inner surface of the segment 1, and the pressure plate 2 that abuts on the fixing surface 31.
Prestress is introduced into the concrete around the anchor rod 23 by tightening 7 with a nut 26 screwed into the male screw portion 25.

The connecting operation in the above configuration will be described.

The segment 1 was assembled in the ring direction by a cotter joint consisting of the cotter brackets 28, 28 and the cotter, and the segment 1 of the preceding ring was positioned and held by the female connecting member 2 at the rear end of the segment 1 by an erector. The male connecting member 3 of the segment 1 of the next ring is opposed and pushed.

When the guide portion 3a of the male connecting member 3 is inserted into the inner peripheral portion of the wedge plate 9 group from the receptacle 8 of the female connecting member 2, the guide portion 3a has a conical cylindrical wedge plate 9 group. The inner diameter of the compression spring 1 gradually becomes larger than that of the small diameter portion on the tip side of the compression spring 1.
It pushes forward against the elastic force of 9 and eventually guides 3a.
When the maximum diameter portion of the base end of the is inserted into the inner peripheral portion of the conical tubular wedge plate 9 group, the diameter of the locking portion 3b gradually decreases toward the rear, so that as shown in FIG. The wedge plate 9 is pushed back by the compression spring 19 and retracts along the tapered hole 5 while contracting toward the inner peripheral side, and the inner peripheral surface of the wedge plate 9 tightly embraces the locking portion 3b of the male connecting member 3. Due to the action, the male connecting member 3 is locked so as not to slip out.

On the other hand, in this state, the segments 1, 1
Since the cushion layers 21 around the nut 20 into which the male connecting member 3 is screwed in and the cushion layer 22 around the anchor rod 23 can be compressed and deformed while being closely joined to each other, the deformation allowable range thereof. In this case, the male connecting member 3 can be displaced in the direction of the end face of the segment 1, and as a result, due to an assembly error of the segment or an installation position error of the female connecting member 2 and the male connecting member 3, the male connecting member 2 and Even if the connecting position of the male connecting member 3 is deviated, these errors can be absorbed and the connecting can be done reliably and reliably.

In this way, the segment 1 in the ring direction is
By using a cotter joint between 1 and the above-mentioned push-in lock joint as the front and rear ring joints, the segment can be set at a predetermined position by the same operation of the erector as before, and the spaces between the rings can be pushed in simultaneously. It is automatically fastened, and the subsequent work is completed only by press-fitting the cotter 21 between the segments in the ring direction.

[0026]

As described above, according to the present invention, the cushion layer around the nut into which the male connecting member is screwed and the cushion layer around the anchor rod can be compressed and deformed. The male connecting member can be displaced in the direction of the end face of the segment, and due to this, an assembly error of the segment or an installation position error of the female connecting member and the male connecting member causes the connecting of the female connecting member and the male connecting member. Even if the position is deviated, these errors can be absorbed and the connection can be made surely and reliably.

Further, since the fitting of the male connecting member is not exposed on the inner peripheral surface of the segment, the appearance is good and it is not necessary to perform the corrosion prevention treatment.

When a tensile force is generated between the front and rear segments due to an earthquake or the like after assembling the segments, the anchor rod behind the female connecting member is cut off from the cushion layer by the concrete of the segment. Due to the elongation, it is possible to secure the deformation followability in the axial direction.

The anchor rod of the male connecting member is curved so that its rear end is projected from the fixing surface of the fixing concave portion provided on the inner surface of the segment, and the pressure bearing plate abutting against the fixing surface while the tension of the anchor rod is applied to the male fixing member is male. By tightening with the nut screwed into the screw part, prestress is introduced into the concrete around the anchor rod, and the concrete in this part can be strengthened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an installed state of a male connecting member according to the present invention.

FIG. 2 is a vertical sectional view showing an installed state of the female connecting member according to the present invention.

FIG. 3 is a cross-sectional view showing a state in which segments are joined by the joint device of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the anchor of the male connecting member according to the present invention.

FIG. 5 is a plan view of a segment according to the present invention.

[Explanation of symbols]

 1 segment 2 female type connecting member 3 male type connecting member 3a guide part 3b locking part 3c tight fitting part 3d male screw part 4 casing 5 taper hole 6 cavity part 7 female screw 8 socket 9 wedge plate 10 screw plug 11 male screw Part 12 Anchor rod 13 Male screw part 14 Nut 15 Male screw part 16 Nut 17 Pressure plate 18 Spring seat 19 Compression spring 20 Nut 21 Cushion layer 22 Cushion layer 23 Anchor rod 24 Male screw part 25 Male screw part 26 Nut 27 Pressure plate 28 Cotter Joint Metal Fitting 29 Water-Proof Seal 30 Fixing Depression 31 Fixing Surface

Claims (2)

[Claims] 1. A plurality of wedge plate groups are movably disposed in a tapered hole provided in a casing of a female connecting member so as to form a conical cylinder shape, and an inner peripheral surface of the wedge plate group is rearward from a front end side. The male connecting member to be inserted into the inner peripheral portion of the conical cylindrical wedge plate group while being tapered so that the inner diameter expands toward
The male connecting member is formed in the shape of a protrusion provided with a locking portion having a tapered surface following the inner peripheral surface of the conical cylindrical wedge plate group at the rear of the sharpened guide portion at the tip, and this male connecting member is formed into the wedge plate group. By inserting the male connecting member into the inner peripheral portion of the wedge plate group, the locking portion of the male connecting member is tightly held by the inner peripheral surface of the wedge plate group, and the male connecting member is locked by the wedge action so as not to slip out. In the segment joint device, a male screw portion protruding from the rear end of the male connecting member is screwed into a nut embedded in the rear end portion of the segment to expose a tip screw hole opening, and the nut is cushioned on the outer periphery thereof. The outer thread of the anchor rod, which is covered with a cushion layer on the outer periphery, is screwed into the outer periphery of the layer, and the nut that is screwed into the male thread provided at the rear end of this anchor rod The support plate inserted in the Fitting device segments to. 2. A plurality of wedge plate groups are movably arranged in a tapered hole provided in a casing of a female connecting member so as to form a conical cylinder shape, and an inner peripheral surface of the wedge plate group is rearward from a front end side. The male connecting member to be inserted into the inner peripheral portion of the conical cylindrical wedge plate group while being tapered so that the inner diameter expands toward
The male connecting member is formed in the shape of a protrusion provided with a locking portion having a tapered surface following the inner peripheral surface of the conical cylindrical wedge plate group at the rear of the sharpened guide portion at the tip, and this male connecting member is formed into the wedge plate group. By inserting the male connecting member into the inner peripheral portion of the wedge plate group, the locking portion of the male connecting member is tightly held by the inner peripheral surface of the wedge plate group, and the male connecting member is locked by the wedge action so as not to slip out. In the segment joint device, a male screw portion protruding from the rear end of the male connecting member is screwed into a nut embedded in the rear end portion of the segment to expose a tip screw hole opening, and the nut is cushioned on the outer periphery thereof. The external threaded portion of the anchor rod, which is covered with a layer and whose outer periphery is covered with a cushion layer, is screwed in, the anchor rod is curved and the external threaded portion of the rear end is provided on the inner surface of the segment. The protrusion is projected from the fixing surface of the fixing recess and Coupling devices of the segment, characterized in that contact with Bearing plate surface is tightened by a nut is screwed to the male screw portion.