JPH11350887A - Inside locking joint structure and segment using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure requiring no works such as anticorrosive treatment and inside secondary lining of a joint member such as a segment. SOLUTION: When each segment 1 is abutted on an inner face of an end part in either or both of the circumferential direction of a tunnel and axial direction of the tunnel of the concrete segment 1 having a predetermined wall thickness, respective bottom faces 5 form a continuous recessed part 3. A pin engaging hole 6 is provided at a position retracted more than an abutment face 4 on the bottom face 5, an engaging pin 9 protruding from a main body part 8 of a joint block 7 is inserted into this pin engaging hole 6, and the main body part 8 is fitted in the recessed part 3 to connect either or both of the circumferential direction of the tunnel and the axial direction of the tunnel of the segment 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal stop joint structure used for connecting segments and other members, and
It is about the segment using it.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a shield method in which a segment is assembled on the inner surface side of an excavation is generally used. The segment used for this shield method is conventionally
This is a connection structure having a bolted joint and abutting segments adjacent to each other in the tunnel inner circumferential direction and the tunnel axial direction, and connecting them with bolts.

[0003]

The segment having such a conventional bolted joint has the following problems. When the secondary lining is not performed, the fitting hardware is exposed on the inner surface of the tunnel, and anticorrosion treatment is required. Further, a filling process of the bolt box is required. In the case of water-related applications such as sewers, drainage channels, and drainage channels, there is an environment in which fittings and bolts are likely to corrode due to water flowing into the tunnel. In addition, it is required to ensure inner surface smoothness and to secure a predetermined roughness coefficient. For this reason, secondary lining work is required. Bolted joints require a lot of time to fasten bolts and require skilled workers to assemble segments.

[0004]

In order to solve the above-mentioned problems, an inner surface stop joint structure according to the present invention is a joint structure in which end faces of members having a predetermined thickness are abutted and joined to each other. When the two members are abutted against the inner surface of the end of the member, each bottom surface forms a continuous recess, and a pin engagement hole is provided at a position on the bottom surface which is recessed from the abutting surface. It is characterized in that a pin protruding from the main body of the block is inserted, the main body is fitted into the recess, and the two members are connected. Further, the segment according to the present invention, when the respective segments are butted against the inner surface of one or both ends in the tunnel circumferential direction and the tunnel axial direction of the concrete segment having a predetermined thickness, A bottom is formed with a continuous recess, a pin engagement hole is provided on the bottom surface at a position retracted from the abutting surface, and a pin protruding from the main body of the joint block is inserted into the pin engagement hole. Are fitted in the recesses to connect one or both of the segment circumferential direction and the tunnel axial direction. Further, in the present invention, the pin engagement hole has a chuck mechanism formed of a check spring which engages the outer periphery of the pin when the pin is inserted into the pin engagement hole and prevents the pin from coming out. It is characterized by its structure.

According to the present invention, a concave portion formed by abutting end faces of members or segments,
By fitting the joint block so as to fill the concave portion and inserting the engaging pin of the joint block into the pin engaging hole located on the bottom surface of the concave portion, it is possible to connect between adjacent members or segments, and the pin is connected to the inner surface thereof. Therefore, even if secondary lining is not performed, anticorrosion treatment is not required and the inner surfaces of members and segments can be made smooth. Further, by providing the chuck mechanism in the pin engagement hole, it is possible to prevent the pin from coming out of the pin engagement hole.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show a first embodiment of the present invention between segments (that is, in the circumferential direction of a tunnel).
FIG. 5 to FIG. 8 show a concrete-type segment in which an inner joint is applied to a joint between rings (ie, in the tunnel axial direction), and FIGS. 3 shows a concrete segment in which an inner joint is applied only to the joint of FIG.

FIGS. 1 and 5 show a segment ring 2 formed by segments 1 according to a first embodiment and a second embodiment, and the left side from the center line in FIGS. The end surface is shown, and the right side from the center line shows the segment ring end surface on the wellhead side.

FIG. 2 is a front view showing a single unit of the segment 1 according to the first embodiment, FIG. 3 is an inner view of FIG. 2, and FIG.
FIG. Two concave portions 3a are formed on the inner surfaces of both ends of the segment 1 in the circumferential direction of the tunnel, and three concave portions 3a are formed on the inner surfaces of the both ends in the tunnel axial direction. Any number may be provided). Each recess 3a is formed by abutting the end surface 4 of each segment 1 in the tunnel circumferential direction and the tunnel axial direction.
The bottom surface 5 of each of the concave portions 3a is connected between the segments 1 so that the concave portion 3 entirely surrounded by the two concave portions 3a is formed. The depth of the recess 3 is provided such that the bottom surface 5 is located near the center (S) of the segment 1 in the girder height direction. In the bottom surface 5 of the recess 3, a pin engagement hole 6 is provided at a position retreated from the segment abutting end surface 4, and straddles the pin engagement hole 6 of each segment 1 abutted on the end surface to form a joint block. 7
An engagement pin 9 protruding from the main body 8 (shown in FIG.
Is engaged, so that the tunnel circumferential joints of the respective segments 1 are connected.

FIG. 6 shows a segment 1 according to the second embodiment.
FIG. 7 is an inner view of FIG. 6, and FIG. 8 is an end view of FIG. In the segment 1 according to the second embodiment, the recess 3a having the same structure as that of the first embodiment is provided only on the inner surface of the end in the circumferential direction of the tunnel, but the recess 3a is provided on the inner surface of the end in the tunnel axial direction. Is not provided, and instead the connection in the tunnel axial direction is
The first embodiment differs from the first embodiment in that engagement is performed by a projection pin 10 protruding from the end face on the face side of the segment 1 and a chuck 11 made of a known ring-shaped spring steel plate provided on the end face on the wellhead side.

The structure of the joint block 7 and the detailed structure of the pin engaging hole 6 with which the engaging pin 9 of the joint block 7 engages will be described with reference to FIGS. 9 to 11 show a joint block 7 according to a first example, and FIGS.
An example coupling block 7 is shown. Each of the joint blocks 7 of the first and second examples is composed of a main body 8 and two engaging pins 9 projecting from the inner surface of the main body 8 at a predetermined interval. The main body 8 is inserted into the engagement hole 6.
Are fitted into the concave portions 3 formed by the two concave portions 3a of the adjacent segments 1 whose end faces abut each other, and at this time, the inner wall surface 12 of the segment 1 and the back surface 13 of the main body 8 are flush with each other. The recess 3 and the main body 8 have the same shape and the same cross-sectional shape, and this point is the same as the joint block 7 of the first example.
The same applies to the joint block 7 of the second example.

The joint blocks 7 according to the first and second examples are:
The fixing structure of the engaging pin 9 in the main body 8 is different.
In particular, the joint block 7 connecting the segments 1 and / or the segment rings 2 is subjected to a tensile force and a shear force acting on the joint portion of the segment, and the resistance to the tensile force and the shear force is reduced by the pin engagement hole 6. In order to bear the load with the engaging pin 9 that engages with it, the engaging pin 9 needs to be firmly embedded and fixed to the main body 8.
The joint block 7 according to the example and the second example is configured from such a viewpoint.

In the joint block 7 of the first embodiment shown in FIGS. 9 to 11, the strength of the main body portion 8 to withstand a large tensile force and a shear force such as concrete reinforced by a reinforcing bar or hard rubber or plastic containing reinforcing fibers. A metal engaging pin 9 is embedded and fixed in a base material 14 having
That is, the inner surface of the segment is covered with the coating material 16 having a smooth surface made of mortar, rubber, epoxy resin, or the like via the uneven bonding portion 15. Although not shown, the base material 14 and the engagement pins 9 may be manufactured by casting, die casting, or the like using an iron material.

In the joint block 7 of the second example shown in FIGS. 12 to 14, two reinforcing plates 17 and 18 made of metal are arranged in parallel, and penetrate through the two reinforcing plates 17 and 18. Two engaging pins 9 are provided, and the penetrating portions thereof are welded.
The two reinforcing plates 17 and 18 and the base end of the engaging pin 9 are embedded in a base material 19 such as concrete, resin, hard rubber or the like to form the main body 8. Joint block 7 of the second example
In the joint portion of the segment 1, the shear force acting on the main body portion 8 via the two engagement pins 9 (that is, FIG.
(Force in the direction of the arrow 2), a shear force can be caused by the tensile force of one reinforcing plate 17 and the compressive force of the other reinforcing plate 18.

The pin engaging hole 6 is formed by embedding a bottomed cylindrical cap 20 in concrete. The pin engaging hole 6 has a built-in chuck mechanism 21 as shown in FIGS. I have. That is, the cap 20 has a pin insertion hole 23 formed in the reinforcing plate
And is welded to the reinforcing plate 22 so that the reinforcing plate 22 is aligned with the bottom surface 5 of the recess 3a.
And is buried in the segment 1.
An anchor reinforcing bar 24 embedded in the segment 1 is welded to the reinforcing plate 22 and the cap 20 is firmly embedded in the concrete via the reinforcing plate 22 and the anchor reinforcing bar 24. Can sufficiently resist the bending, pulling, and shearing forces acting on the cap 20 from the side.

The details of the chuck mechanism 21 provided at the opening of the pin engagement hole 6 will be described with reference to FIGS.
In each figure, the distal end surface of the circumferential wall 25 of the bottomed cylindrical cap 20 is welded to the inner surface of the end of the reinforcing plate 22, and the engaging recess 26 is formed on the inner surface of the distal end of the circumferential wall 25, The periphery of a check spring 27 made of a double-mounted ring-shaped spring steel plate whose center line coincides with the pin insertion hole 23 formed in the reinforcing plate 22 is formed on the inner surface of the reinforcing plate 22 and the pin insertion hole 23. Are arranged on the periphery. The ring-shaped check spring 27 has a large number of cuts 29 formed in the periphery of the ring hole 28 to form a large number of spring pieces 30 whose tips are inclined toward the center of the hole in the circumferential direction. A spacer 31 is provided between the peripheral portions of the upper and lower check springs 27.
A gap is formed between the vertically overlapping spring pieces 30 with the interposition of the spring pieces, so that the spring action of each of the upper and lower spring pieces 30 is sufficiently exerted. The circumferential wall 2 of the cap 20
The retainer 32 made of an annular plate is locked on the upper step surface of the engagement concave portion 26 formed on the inner surface of the inner surface 5. By pressing the upper check spring 27 with the retainer 32, each check spring 27 is formed. It is fixed to the opening of the cap 20.

Therefore, as shown in FIGS. 15 and 16, when the engaging pin 9 of the joint block 7 is inserted into the pin engaging hole 6 (that is, the cap 20), the tip of each spring piece 30 of the check spring 27 is Since the entire circumference of the engaging pin 9 is strongly engaged, the engaging pin 9 does not come out of the pin engaging hole 6 thereafter. If the outer periphery of the engaging pin 9 is roughened or a step is provided, the check spring 27 is engaged with the engaging pin 9 to prevent it from coming out more completely. In the present invention, the shapes and structures of the engagement pin 9 and the pin engagement hole 6 are not limited to those shown in the drawings. May be implemented.

FIG. 15 shows a case where the center of the check spring 27 and the center of the engagement pin 9 are aligned. As shown in FIG. , That is, the engaging pin 9 is in contact with the hole wall 33 on the adjacent side of the pin insertion hole 23 of the reinforcing plate 22 so that the abutting end faces of the opposing segments 1 are tightened. The sealing material 35 fitted to the sealing groove 34 formed on the abutting end face is compressed and deformed to improve the sealing performance. Even if the respective centers of the check spring 27 and the engagement pin 9 are displaced in this manner, each spring piece 3 of the check spring 27
0 is inclined toward the center of the ring hole 28,
Also, since each spring piece 30 is engaged with the entire circumference of the engaging pin 9, even if there is a misalignment, the engaging pin 9 and the check spring 2
7 is not affected.

[0018]

According to the present invention, the following effects can be obtained. Since the engaging portion of the joint block connecting the members and the segments is not exposed on the inner surface of the member or the segment ring, the anticorrosion treatment is not required. Further, since the joint block fits into the concave portion, it is not necessary to fill the hole of the conventional bolt box, and the secondary lining can be eliminated. Since there is no missing portion such as a bolt box on the inner surface of the member or the segment ring, smoothness is secured, and in a tunnel such as a sewer, a required roughness coefficient can be sufficiently secured. If the connecting portions of the members and the segments are of the chuck pin type, the assembling work can be performed efficiently, so that the economy is excellent. The connecting portion (that is, the fastening position) of the member or the segment can be installed near the center of the thickness (girder height) of the member or the segment, and the segment ring strength and rigidity can be increased as compared with the conventional bolt joint.

[Brief description of the drawings]

FIG. 1 is an end view of a segment ring according to a first embodiment, in which a left side from a center line shows a face side, and a right side shows a wellhead side.

FIG. 2 is a front view of a segment according to the first embodiment.

FIG. 3 is an inner view of the segment of FIG. 1;

FIG. 4 is a side end view of FIG. 1;

FIG. 5 is an end view of the segment ring according to the second embodiment, in which the left side from the center line shows the face side, and the right side shows the wellhead side.

FIG. 6 is a front view of a segment according to a second embodiment.

FIG. 7 is an inner view of the segment of FIG. 6;

FIG. 8 is a side end view of FIG. 6;

FIG. 9 is a cross-sectional view of the joint block according to the first example in which an engaging pin is inserted into a pin engaging hole.

FIG. 10 is a plan view of a joint block according to a first example.

FIG. 11 is a front view of a joint block according to a first example.

FIG. 12 is a cross-sectional view of the joint block according to the second example in which an engaging pin is inserted into a pin engaging hole.

FIG. 13 is a cross-sectional plan view of a joint block according to a second example.

FIG. 14 is a front view of a joint block according to a second example.

FIG. 15 is a cross-sectional view showing an engagement relationship between the chuck mechanism and the engagement pin in the pin engagement hole in a mode where there is no axial displacement between the engagement pin and the pin insertion hole.

FIG. 16 is a cross-sectional view showing an engagement relationship between the chuck mechanism and the engagement pin in the pin engagement hole in a state where the engagement pin and the pin insertion hole are axially offset.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 segment 2 segment ring 3 a recess 3 recess 4 end face 5 bottom surface 6 pin engagement hole 7 joint block 8 main body 9 engagement pin 10 protrusion pin 11 chuck 12 inner wall surface 13 back surface 14 base material 15 uneven bonding portion 16 coating material 17 Reinforcement plate 18 Reinforcement plate 19 Base material 20 Cap 21 Chuck mechanism 22 Reinforcement plate 23 Pin insertion hole 24 Anchor reinforcing bar 25 Circumferential wall 26 Engagement recess 27 Check spring 28 Ring hole 29 Cut 30 Spring piece 31 Spacer 32 Retainer 33 Hole wall 34 Seal groove 35 Seal material

Claims (3)

[Claims] 1. A joint structure in which end surfaces of members having a predetermined thickness are butt-joined to each other, and when both members abut against an inner side surface of an end of each member, a concave portion is formed in which the bottom surface of each member is continuous. A pin engagement hole is provided on the bottom surface at a position retracted from the abutting surface, and a pin protruding from the main body of the joint block is inserted into the pin engagement hole, and the main body is fitted into the recess. An internal stop joint structure characterized by connecting both members. 2. The bottom surface of each concrete segment having a predetermined thickness is continuous with the inner surface of one or both ends in the tunnel circumferential direction and the tunnel axial direction when the segments are abutted. A recess is formed, a pin engagement hole is provided at a position on the bottom surface that is retracted from the abutting surface, and a pin protruding from the main body of the joint block is inserted into the pin engagement hole, and the main body is inserted into the recess. A segment characterized by being fitted and connected to one or both of a segment circumferential direction and a tunnel axial direction of the segment. 3. The non-return lock according to claim 1, wherein when the pin is inserted into the pin engagement hole, a spring piece is engaged with the outer periphery of the pin to prevent the pin from coming off. A joint structure having a spring chuck mechanism.