JP3094894B2 - Steel segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for connecting steel segments, which are constituent members of a segment ring provided as a primary lining of a shield tunnel, at joint portions of the steel segments. Things.

[0002]

2. Description of the Related Art Conventionally, as a joint structure of a steel segment of this type, as shown in FIG.
, Which are tightened by connecting bolts 22, that is, a so-called bolt joint structure is generally known.

[0003]

However, the transmission of bending and tensile stress in the above-mentioned conventional joint structure is performed through a joint plate. Therefore, in this conventional bolt joint structure, stress concentrates on the joint plate, and the joint plate 21 may be deformed as shown in FIGS. Here, FIG. 10 shows a case where a bending moment is applied, and FIG. 11 shows a case where a tensile force is applied.

When the joint plate 21 is deformed as shown in FIG. 10 and FIG.
Cannot be performed with the connection surfaces 20a of both segments 20 abutting on each other without a gap. This makes it impossible to fulfill the role of the primary lining member, that is, the water blocking of the shield tunnel formed by the segments to be connected and the maintenance of the shape of the segment ring.

[0005] As described above, the conventional bolted joint structure depends on the deformation performance and strength of the joint plate.
The rigidity and strength of the joint portion are smaller than those of the segment main body portion, and it is difficult to maintain a reliable connection state (a state in which the connection surfaces are brought into contact with no gap) between the two segments. Furthermore, depending on the deformation performance and strength of the joint plate, the specification of the joint plate must be changed every time the specification of the joint bolt changes, and it is necessary to prepare various joint plate specifications. There is.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to increase the strength and rigidity of a joint portion of each steel segment to be used as a primary lining segment ring of a shield tunnel. An object of the present invention is to provide a joint structure that can be easily and reliably connected.

[0007]

The joint structure according to the present invention comprises:
When constructing a segment ring for primary lining in a shield tunnel, an attachment plate is attached to the main girder of each steel segment that is continuous in the direction between the segments, and this attachment plate and the main girder are friction-bonded. By tightening with high-strength bolts, the connection of each steel segment is performed by friction welding via the contact plate on the side surface of each main girder.

According to the joint structure of the present invention having the above-described structure, the connection of the steel segments is performed by tightening the main girder of each steel segment with the high-strength bolt for frictional connection via the attachment plate. Instead of using the joint plates of both segments that are in contact, the operation can be performed on the side surface of the main girder of each steel segment. That is, the connection of each steel segment is
It is performed by friction welding in the side direction of the segment.

[0009] From these facts, as in the conventional joint structure shown in Fig. 9, the joint plate is deformed by the fact that stress is transmitted in the axial direction of the connecting bolt and the joint plate is deformed. The connection of each steel segment to be made can be made stronger. Moreover, such a reliable and firm connection is made by tightening the contact plate attached to the main girder of one steel segment and the main girder of the other steel segment to each main girder with a high-strength bolt for frictional joining. Make it easy to do.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint structure of a steel segment according to the present invention will be described below with reference to an embodiment shown in the drawings.

A joint structure 1 (see FIGS. 1 to 4) used when connecting the steel segments 2 for constructing the primary lining segment ring (not shown) in the shield tunnel is as follows.
Attach the attachment plate 4 to the main girder 3 of each steel segment 2 which becomes continuous in the direction between the segments when the ring is constructed,
By fastening the contact plate 4 and the main girder 3 with high-strength bolts 5 for frictional joining, the steel segments 2 are connected by friction joining via the contact plate 4 on the side surface of each main girder 3. ing.

As shown in FIG. 5, each steel segment 2 in this embodiment has an outer main girder in which a main girder 3 extending over the entire length of the segment serves as a side plate 2a on both side surfaces of the segment, and two side plates 2a. A plurality of inner main girders are provided between (outer main girders) at equal intervals. In addition, a plurality of vertical ribs 6 (see FIG. 2) are provided between the main girders 3 serving as the inner main girders between the main girders 3 serving as both side plates 2a (outer main girders) of each steel segment 2. Is provided. Although not shown, a plurality of the vertical ribs 6 are provided at equal intervals in a direction between the rings when the ring is constructed in the steel segment 2. Further, the joint plate 2b of the connecting surface in each steel segment 2 has a height of not more than half of the segment thickness.

In the contact plate 4 in this embodiment, an avoiding recess 4b for avoiding the joint plate 2b of the steel segment 2 is formed substantially at the center of the plate body 4a.
At the lower end of the plate body 4a, a bottom plate of the steel segment 2
A supporting rib 4c abutting on the main girder 3 and a supporting rib abutting on the bottom plate 2c are formed.
4c to form a substantially L-shaped cross section. As shown in FIGS. 1 and 3, the attachment plate 4 is attached to both side surfaces of each main girder 3.
As shown in FIG. 2, each main girder 3 is fastened and fixed by a plurality of high-strength bolts 5 for frictional joining. Note that the high-strength bolt 5 for frictional joining illustrated in FIGS. 1 and 2 is only a part, and the subsequent parts are omitted.

The continuous state of the main girder 3 of each steel segment 2 at the time of ring construction in this embodiment is shown in FIG.
As shown in the figure, the centering projection 7 integrally provided on the joint plate 2b between the segments of one steel segment 2 to be connected and projecting from the segment body is connected to the other steel segment to be connected. This is achieved by engaging with a centering concave portion 8 provided in the joint plate 2b between the segments in FIG.

Then, the centering concave portion 8 in this embodiment is used.
Is a steel segment 2 as shown in FIGS.
From the upper end of the joint plate 2b to a substantially central portion of a plate-like body integrally extending with the same thickness as the joint plate 2b in the height direction so as to be tapered in the direction of the bottom plate 2c of the steel segment 2. It is composed of the formed engagement notch 9. Also, as shown in FIGS. 1, 3 and 5, the centering projection 7 in this embodiment is similar to the centering recess 8 in the joint plate of the steel segment 2.
From the upper end of the bottom plate 2c in the direction of the height of the joint plate 2b, a substantially central portion of a plate-like body extending integrally with the joint plate 2b is inserted in the notch 9 which is the centering concave portion 8 so as to be inserted into the notch 9. It is composed of an engagement projection 10 formed in a substantially trapezoidal wedge shape that is tapered.

According to the alignment projections 7 and the alignment recesses 8 having the constructions shown in FIGS. 1 to 5, only the portions of the steel segments 2 to be connected to which the joint plates 2b face. In the space described above, the engagement between the alignment protrusion 7 and the alignment recess 8 can be performed. Therefore, there is no need for a complicated structure such as providing a special fitting on the joint plate 2b of the two steel segments 2 to be connected, and a simple structure that does not affect the internal structure of the steel segment 2 at all. Thus, the centering operation for achieving the continuous state of the main girder 3 of each steel segment 2 at the time of ring construction can be reliably performed.

In order to connect the two steel segments 2 to be connected using the joint structure 1 of the present invention having such a structure, first, as shown in FIG. With the two joint plates 2b facing each other, the two steel segments 2 to be connected face each other.

Next, as shown in FIG. 1, the engaging projection 10 which is the centering projection 7 in one steel segment 2 to be connected is aligned with the centering projection 10 in the other steel segment 2 to be connected. The joint plate 2b of the connection surface of one steel segment 2 to be connected and the joint plate of the connection surface of the other steel segment 2 are inserted into and engaged with the notch 9 for engagement which is the concave portion 8 for connection. 2b. Then, at this time, the main girder 3 of both steel segments 2 to be connected was continuous by the centering action of the centering recess 8 and the centering projection 7 fitted in the centering recess 8. State.

The joint plates 2b of the two steel segments 2 to be connected are brought into contact with each other in the form shown in FIG. 5 and also in the height direction of the joint plate 2b (the thickness direction of the segment). A method (not shown) in which the movement is performed is also conceivable. Also in the case of this method, the notch 9 for engagement which is the concave portion 8 for centering is tapered in the direction of the bottom plate 2c of the steel segment 2 which is the height direction of the joint plate 2b of the steel segment 2. As a result, the alignment projection 7 and the alignment recess 8 can be easily engaged with each other, and the main girders 3 of the steel segments 2 to be connected can be in a continuous state. Come.

Next, as shown in FIG. 2, both joint plates 2b are tightened by joint bolts 11. As a result, both the steel segments 2 are temporarily fixed, and both the joint plates 2b are fixed.
The sealing effect of the sealing material 12 disposed between them can be enhanced.

Next, as shown in FIGS. 1 and 2, the joint plate 2b of the connecting surface of the two steel segments 2 to be connected.
In the recess 5a for avoiding
Alignment projections 7 in both steel segments 2 to be connected
And each main girder 3 formed as a continuous surface by the alignment recess 8.
Attached to the side of. At this time, by making the supporting ribs 4c of the attachment plate 4 abut against the bottom plate 2c of the steel segment 2, the attachment operation of the attachment plate 4 to the side surface of each main girder 3 becomes easy.

Next, as shown in FIG. 1 and FIG. 2, the attachment plate 4 and the respective main girders 3 which are in contact with the side surfaces of the respective main girders 3 are tightened with high-strength bolts 5 for frictional joining. Then, the joining operation of the two steel segments 2 to be joined is completed by the friction joining in which the two main girders 3 of the both steel segments 2 and the attachment plate 4 are tightened by the high strength bolts 5 for friction joining.

According to such a joint structure 1 of the present invention,
By connecting the two steel segments 2 to be connected by friction joining using the high-strength bolts 5 for friction joining in the lateral direction, stress is transmitted in the axial direction of the connecting bolt as in a conventional joint structure. The phenomenon that the joint plate 2b is deformed is eliminated, and the two segments 2 to be connected can be connected more firmly. In addition, such a strong and secure connection between the two steel segments 2 can be performed by a simple operation such as a tightening operation using a high-strength bolt 5 for frictional connection between the attachment plate 4 and each main girder 3.

Further, by the centering action of the centering projection 7 and the centering recess 8, each main girder 3 of both steel segments 2 to be connected can be continuously connected by a simple operation without using any special means. (A side surface of each main girder 3 is a continuous surface). Therefore, the work of attaching the attachment plate 4 to the side surface of the main girder 3 can be performed easily and reliably.

The tightening operation by the high-strength bolts 5 for frictional connection between the two main girders 3 and the contact plate 4 as described above is sequentially repeated for each steel segment 2 so that each steel segment is 2 constitutes a segment ring (not shown) for primary lining of the shield tunnel.

FIGS. 6 to 8 show another embodiment of the joint structure 1 of the present invention, in which the configurations of the alignment projection 7 and the alignment recess 8 are different.

As shown in FIGS. 6 and 8, the centering recess 8 in this embodiment is tapered in the direction of the bottom plate 2c of the steel segment 2 which is the height direction of the joint plate 2b of the steel segment 2. And two plate-shaped members 13 arranged in a substantially C shape. Each plate 13 is provided in contact with the joint plate 2b and the bottom plate 2c. A reinforcing plate 15 is provided between the plate 13 and the bottom plate 2c.

The alignment projection 7 in this embodiment is shown in FIG.
As shown in FIGS. 7 and 8, when inserted between the two plate-like members 13 constituting the alignment recess 8, the two plate-like members 13
It is composed of a single plate-like body 14 formed in a wedge shape that can be in close contact with. As shown in FIGS. 7 and 8, the plate-like body 14 comes into contact with a projection 14a projecting from the joint plate 2b to the outside of the segment and the joint plate 2b and the bottom plate 2c within the segment from the joint plate 2b. Base 14b. A reinforcing plate 15 is provided between the plate 14 and the bottom plate 2c.

In order to connect the steel segments 2 to be connected using the joint structure 1 of another embodiment of the present invention having such a configuration, first, as shown in FIG. With the two joint plates 2b of the steel segment 2 facing each other,
The two steel segments 2 to be connected face each other.

Next, as shown in FIG. 6, a plate-like body which is a centering projection 7 in one steel segment 2 to be connected.
Fourteen projections 14a are connected to the other steel segment 2 to be connected.
The joint plate 2b of the connection surface of one steel segment 2 to be connected and the joint plate 2b of the connection surface of the other steel segment 2 are inserted between the two plate-like bodies 13 which are the concave portions 8 for centering. And for the time being. At this time, the main girder 3 of both steel segments 2 to be connected is operated by the action of the alignment recess 8 and the alignment projection 7 engaged with the alignment recess 8.
Becomes a continuous state.

The method of bringing the joint plates 2b of both steel segments 2 to be connected into contact with each other is performed in the form shown in FIG. 6 and also in the height direction of the joint plate 2b (the thickness direction of the segment). It is also conceivable to carry out the method by moving to (not shown). Also in the case of this method, the two plate-like bodies 9 in the alignment recess 8 are oriented in the direction of the bottom plate 2c of the steel segment 2 which is the thickness direction of the steel segment 2 (the height direction of the joint plate 2b). Since they are arranged in a tapered substantially C-shape, the alignment projection 7 and the alignment recess 8 can be easily engaged with each other, and the main girder 3 of the steel segments 2 to be connected can be engaged. In a continuous state.

Further, in the joint structure 1 of the other embodiment, the subsequent connection work is performed in the same procedure as that of the embodiment shown in FIG. And by this similar connection work,
The connection work in this joint structure 1 of another form is completed, and the connection of the two steel segments 2 to be connected is performed.

[0033]

According to the connection structure of the present invention, each main girder of both steel segments to be connected and the contact plate attached to each main girder are tightened by high-strength bolts for frictional joining. The connection of the two steel segments to be connected is performed not on the connecting surface of the two segments but on the side of each main girder of the two segments. That is, the two segments are connected by frictional joining in the side surface direction of the segment.

Therefore, according to the present invention, unlike the conventional joint structure, there is no phenomenon that the joint plate is deformed due to the transmission of the stress in the axial direction of the connecting bolt, and the connection between the two segments to be connected is prevented. Can be performed more firmly. In addition, such a firm connection between the two segments can be performed by a simple operation of tightening each main girder and the attachment plate with a high-strength bolt for frictional joining.

Further, the main girder of both steel segments to be connected is continuously connected (each main girder) by a simple operation without using any special means by the action of the centering projection and the centering recess. Can be made continuous. for that reason,
The work of attaching the attachment plate to the side surface of the main girder can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a joint structure of a steel segment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a schematic perspective view showing a state before connection of steel segments used in the joint structure of the present invention.

FIG. 6 is a schematic perspective view showing another embodiment of the joint structure of the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a schematic perspective view showing a state before connection of steel segments used in the joint structure of another embodiment of the present invention shown in FIG. 6;

FIG. 9 is a schematic view showing a joint structure of a conventional segment.

FIG. 10 is a schematic view showing a deformed state of a joint plate in the joint structure shown in FIG. 9;

11 is a schematic view showing a deformed state of a joint plate in the joint structure shown in FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joint structure, 2 ... Steel segment, 2a ... Side plate, 2b ... Joint plate, 2c ... Bottom plate, 3 ... Main girder, 4 ... Abutment plate, 4a ... Plate body, 4b ... Avoidance recess, 4c ... Support Rib, 5: High-strength bolt for friction joining, 6: Vertical rib, 7: Projection for alignment, 8
... Central recess, 9 ... Cut notch for engagement, 10 ... Protrusion for engagement,
11: Joint bolt, 12: Seal material, 13: Plate, 14: Plate, 14a: Projection, 14b: Base, 15: Reinforcement plate.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-U 4-46194 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/14 E21D 11/04 E21D 11 / 08

Claims (4)

(57) [Claims] 1. A joint structure for connecting each steel segment for constructing a primary lining segment ring in a shield tunnel, wherein the main girder of each steel segment is continuous in a direction between the segments when the ring is constructed. With the plate
Rutotomoni, by tightening in this spliced plate and the main beam and the frictional joining high-strength bolts, and conduct the connection of the steel segment friction bonding via said spliced plates on each main girder side , Of the joint plate between the segments in each steel segment
If the height is less than half the segment thickness
In the meantime, the avoidance recess for avoiding the joint plate is provided on the contact plate.
A part is formed, and the contact plate is in contact with the bottom plate of the steel segment.
A joint structure for a steel segment, wherein a contact rib for contact is formed . 2. The steel chambers during construction of the ring.
The continuous state of the main girder of the
Provided on the joint plate between segments in the segment
The alignment projection that protrudes integrally from the segment body,
Between segments in the other steel segment to be connected
Extending inside the segment body provided on the joint plate of
Achieved by engaging the alignment recess
The joint structure for a steel segment according to claim 1, wherein 3. The centering recess is provided in the steel segment.
To the bottom plate of the steel segment, which is the height direction of the joint plate
It is formed so as to be tapered, and the alignment is performed.
When the projection for engagement is engaged with the recess for centering,
It is characterized by being formed in a wedge shape that can be in close contact with the surface
The joint structure for a steel segment according to claim 2. 4. The centering concave portion has a joint of a steel segment.
Integral with the same thickness as the joint plate in the height direction from the upper end of the hand plate
At the approximate center of the plate extending to the bottom of the steel segment
Notch for engagement formed so as to taper in the plate direction
And the alignment convex portion is provided for the alignment.
From the top of the joint plate of the steel segment,
Of the plate-like body extending in the same direction with the same thickness as the joint plate
At the approximate center, a bottom is formed so as to be able to engage with the notch for engagement.
Engagement formed in a substantially trapezoidal wedge tapering shape to plate direction
3. The structure according to claim 2, wherein the joint is formed by a joint projection.
The joint structure of the steel segment shown.