JP6837338B2 - Ring joint structure of steel segment and its connection method - Google Patents

Description

The present invention relates to a ring joint for connecting steel segments for constructing a tunnel wall in the tunnel axial direction and a method for connecting the ring joints.

Traditionally, many segments for shield tunnels are assembled by bolting. However, in recent years, as ring joints that connect the rings of segments, one-pass type joints that can be fitted only by insertion have been developed, and their achievements are increasing.

Specifically, Patent Document 1 describes a male joint provided on one of the two segment members located in the axial direction of the tunnel and the other segment located on a surface facing the one segment member. The male joint is composed of a female joint provided on the member, and the male joint has a male joint head, a male joint constriction portion, and a male joint shaft portion protruding in a direction of fitting with the female joint, and the male joint shaft. When a plate member having a female joint hole having a size capable of inserting a portion and having a plate member fixing portion and a plate member deforming portion is arranged on the back surface of the female joint hole, and the male joint is inserted. A ring joint in which the deformed portion of the plate member is deformed in the insertion direction, and after the head of the male joint is inserted into the deformed portion of the plate member, the deformed portion of the plate member is elastically restored so as to engage with the constricted portion of the male joint. It is disclosed.
Further, Patent Document 2 includes a cylinder for installing a male member inside the end face plate of one segment of the steel segment, and is for a female member for receiving the male member inside the end face plate of the other segment. The male member is a nut cylinder attached to the inside of the end face plate, a screw rod screwed into the nut cylinder, a split cylinder attached coaxially with the screw rod, and the inside of the split cylinder. It is composed of an inserted conical rod, and a cutting line is engraved on the split cylinder in the axial direction of the cylinder, and the cutting line expands in a divergent shape as the conical rod enters the split cylinder. The female member is a tubular body attached to the inside of an end face plate, and a ring joint composed of a receiving cylinder having an inner diameter of a size that meets the outer circumference of an enlarged split cylinder is disclosed.
Further, in Patent Document 3, a male side joint and a female side joint are fixed to each of the members to be fastened, the male side joint is composed of male side bolts, and the female side joint has a casing and a plurality of female side bolts. The inner peripheral surface near the male side end of the casing has an inclined surface that moves inward in the radial direction if the female side bolt that abuts there is urged to the male side. In a coupling device configured to engage a male-side bolt and a female-side bolt, a lid-like member that engages with the male-side end of the casing is provided, and a male is provided inward in the radial direction of the lid-like member. A through hole through which a side bolt is inserted is formed, a male screw is formed on the outer peripheral surface, and a female screw is formed on the inner peripheral surface of the male side end of the casing, and a lid-like member is formed. A ring joint is disclosed in which a male screw formed on the outer peripheral surface of the casing is screwed into a female screw formed on the inner peripheral surface of the male side end of the casing.

In addition to the above, various types of ring joints have been developed and put into practical use, ranging from simple ones to complex structures. Such ring joints include RC segments and filled concrete steel segments. Mostly applied to.
The reason why it is less applicable to steel segments is that compared to concrete segments used for shield tunnels of similar scale, the joint joint direction is the out-of-plane direction of the main girder, so it is easily deformed and placed on the joint surface. The number of joints tends to increase in order to enclose the repulsive force of the waterproof sealing material, and it is considered that inexpensive bolt joints are often used instead of expensive one-pass type joints.
In addition, in steel segments, welding strain caused by joining various members such as main girders, joint plates, skin plates, and vertical ribs that form steel shells may cause misalignment and opening between segments during segment assembly, and shield excavation. Deformation accumulates due to the load history due to the reaction force of the jack for digging the machine and the soil water pressure. For this reason, it is customary to retighten the bolts when the deformation has settled down to some extent.
Therefore, when a one-pass type ring joint is adopted for a steel segment having a property of being easily deformed as compared with a concrete segment, it is desirable that the segment can be loosened to some extent at the time of segment assembly and can be retightened later.

Japanese Unexamined Patent Publication No. 2006-161284 Japanese Unexamined Patent Publication No. 2009-203684 Japanese Unexamined Patent Publication No. 2011-179209

An object of the present invention is to provide a ring joint structure of a steel segment and a method for connecting the ring joint, which can be retightened after the fact so that the joint state of the joint is loose to some extent at the time of segment assembly.

The ring joint of the steel segment of the present invention is a joint for connecting the steel segment for constructing the tunnel wall body in the tunnel axial direction, and is one of the two segment members located in the tunnel axial direction. It is composed of a male joint provided on the member and a female joint provided on the other segment member located on the surface facing the one segment member, and the male joint and the female joint are the male joint and the female joint. The male joint has a fitting structure that is rotatably inserted into a through hole provided in the main girder of the one segment member, and the male member is rotatably inserted into the main girder of the one segment member. The main girder is provided with at least a nut fixed to a surface opposite to the connecting surface, the male member is fixed to the nut by screwing, and the rear end of the male member can be retightened. A polygonal concave portion or convex portion is formed, and a locking nut is further tightened at the rear portion of the male member so as to be in close contact with the nut .
Further, the method of connecting the ring joint of the steel segment of the present invention is a method of connecting the ring joint for connecting the steel segment for constructing the tunnel wall body in the direction of the tunnel axis, and is located in the direction of the tunnel axis2. Of the three segment members, a nut rotatably inserted into a through hole provided in the main girder of one segment member and fixed to a surface opposite to the connecting surface, and a male fixed to the nut by screwing. A male joint including at least one of the members is fitted by inserting it into a female joint provided in the other segment member located on a surface facing the one segment member, and then fitted to the rear end portion of the male member. There line tighten by turning the concave or convex portion of the formed polygonal, the nut Komu further tighten the locking nut so as to closely, characterized in that.

According to the ring joint of the steel segment and the method of connecting the ring joint of the present invention, the joint state of the joint can be loosened to some extent at the time of assembling the segment, and the joint can be retightened after the fact.

Ring joint structure of steel segment in the present invention. A rotating jig for a male member of a ring joint structure of a steel segment in the present invention. (A) When assembling the ring joint structure of the steel segment in the present invention, and (b) When retightening the ring joint structure of the steel segment in the present invention.

Hereinafter, embodiments of the ring joint of the steel segment of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of the structure of the ring joint of the steel segment in the present invention with reference to the ring joint structure described in Patent Document 3.
From the figure, the ring joint structure includes a male joint 1 and a female joint 2 fixed at predetermined positions of the steel segment main girder S, respectively.

According to the present embodiment, the male joint 1 includes at least a male member 11 and a nut 12 into which the male member 11 can be screwed.
The nut 12 is aligned with the joint surface of the steel segment main girder S so that the center of the hole S1 in which the male member 11 is rotatably inserted and the center of the nut 12 coincide with the steel segment main girder S. It is fixed by welding on the opposite side.
When assembling the segment, the male member 11 is screwed into the nut 12 in advance to a predetermined position where it can be fitted.

According to the present embodiment, the female joint 2 includes a case 21 having an opening through which the male member 11 can be inserted, and female members 22, 22 ... , Plate 23 arranged so that the ends of the female members 22, 22 ... Are supported in order to support the pressing force that the male member 11 receives during insertion of the female members 22, 22 ... It is composed of an elastic body 24 for transmitting the pressing force received by the case 21 to the case 21.
The female members 22, 22 ..., The plate 23 and the elastic body 24 are all housed in the case 21.
In the steel segment main girder S, the case 21 is formed of the steel segment main girder S so that the center of the hole S2 in which the male member 11 is inserted and rotatably provided coincides with the center of the opening of the case 21. It is fixed by welding on the side opposite to the joint surface.

FIG. 2 shows an example of a rotating jig for a male member of a ring joint structure of a steel segment in the present invention.
From FIG. 3A, a quadrangular concave portion 111 is provided at the rear end portion of the male member 11, and a torque wrench (not shown) having a convex portion having a shape that can be inserted into the concave portion 111 can be used. From FIG. 3B, a quadrangular convex portion 112 is provided at the rear end portion of the male member 11, and the number is increased by using a torque wrench (not shown) having a concave portion having a shape into which the convex portion 112 can be inserted. It becomes possible to tighten.

FIG. 3 shows a method of connecting the ring joint structure of the steel segment in the present invention.
From FIG. 3A, when the steel segment is assembled, the degree of protrusion of the male member 11 can be determined so that the male joint 1 can be fitted to the female joint 2 and the manufacturing accuracy, the assembly accuracy of construction, the encapsulation of the sealing material, etc. are taken into consideration. The male member 11 is screwed into the nut 12 by adjusting in advance.
At the time of segment assembly, the male joint 1 is inserted into the female joint 2 to fit each other's joints, and a temporary connection is performed.

From Fig. (B), the bolts are retightened when the accumulated deformation due to the jack reaction force for excavation of the shield excavator and the load history due to soil water pressure has settled down to some extent. For retightening, the rear end portion of the male member 11 is retightened using a torque wrench or the like until a predetermined torque value is reached. After retightening, it is desirable to tighten with a separate nut (not shown) so that the retightened male member 11 does not loosen.

According to the ring joint of the steel segment and the method of connecting the ring joint of the present invention, the joint state of the joint can be loosened to some extent at the time of assembling the segment, and the joint can be retightened after the fact.

As described above, the embodiment of the present invention has been described in detail with reference to the ring joint structure described in Patent Document 3, but the specific configuration is not limited to this embodiment. Even if there are changes and the like within the scope of the gist of the present invention, they are included in the present invention.

1 Male fitting 11 Male member 111 Concave part for jig 112 Convex part for jig 12 Nut 13 Welding 2 Female joint 21 Case 22 Female member 23 Plate 24 Elastic body 25 Welding S Steel segment main girder S1 Hole

Claims (2)

A joint for connecting the steel segments that make up the tunnel wall in the direction of the tunnel axis.
Of the two segment members located in the tunnel axial direction, the male joint provided on one of the segment members and
It is composed of a female joint provided on the other segment member located on the surface facing the one segment member.
The male joint and the female joint have a fitting structure in which the male joint is fitted by inserting the male joint into the female joint.
The male joint includes a male member rotatably inserted into a through hole provided in the main girder of the one segment member.
It is provided with at least a nut fixed to a surface of the main girder of the one segment member opposite to the connecting surface.
The male member is fixed to the nut by screwing .
A polygonal concave or convex portion is formed at the rear end of the male member so that it can be retightened.
A locking nut was further tightened to the rear part of the male member so as to be in close contact with the nut.
It features a steel segment ring fitting. A ring joint connection method for connecting steel segments that construct a tunnel wall in the tunnel axial direction.
Of the two segment members located in the tunnel axial direction, the nut and the nut rotatably inserted into the through hole provided in the main girder of one segment member and fixed to the surface opposite to the connecting surface. A male joint having at least a male member fixed by screwing,
A polygonal concave or convex portion formed at the rear end of the male member after being fitted by inserting it into a female joint provided on the other segment member located on a surface facing the one segment member. There line tighten by turning the, Komu further tighten the locking nut so as to close the nut, method of connecting the ring joints of the steel segments, characterized in that.

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