JPH0689639B2 - Structure of segment joint - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a segment joint portion which is provided on a joint end surface of a segment for tunnel lining and which connects the segments.

[Prior Art] When constructing various underground structures such as tunnels, underpasses, and water and sewer systems, in recent years, an assembly type lining segment for primary lining has been widely used.

This type of segment is a space in the tail of the shield that is excavated and propelled into a circle, and is assembled in an annular shape to form the inside of a predetermined tunnel in the shield construction method. Since the assembly is carried out, it is divided into several pieces and manufactured to be incorporated into the assembly.

By the way, the segment includes a concrete flat plate type segment, a core type segment, a steel segment and the like, which are properly used in consideration of the size of the tunnel and the working conditions.

Generally, when assembling these segments in an excavated tunnel, as shown in FIG. 7 (cylindrical wall body by flat plate type segmet), it is impossible to assemble with all the segments 1 having the same shape. Usually, the side surface of one of the segments (key segment) 1a is formed in a tapered shape, and this is inserted at the end so that the tubular wall 2
It is possible to assemble. In addition, in the segments 1, 1 ... Assembled in the adjacent ring shape, the joint surface of the end faces of the segment 1 is connected to the joint surface of the segments 1, 1 assembled in the adjacent ring shape in a straight line so that the rigidity is not deteriorated. The segments 1, 1 ... Are assembled alternately.

Conventionally, the structure of the joint portion for connecting these segments 1 and 1 is, for example, in a flat plate type segment, as shown in FIG. 8, joint metal fittings 4, 4, ... A recess 3c for operating a bolt, which is embedded in the joint fitting 4, 4, ...
Are formed, and connection holes 4a through which the connecting bolts 5 are inserted are provided in the joint fittings 4, 4 ,. Then, the joint fittings 4 and 4 of the flat plate type segment to be joined are butted against each other, the connection bolt 5 fitted with the washer 5a and the waterproof rubber packing is passed through the connection holes 4a and 4b, and the connection bolt 5 is further waterproofed. The flat plate segments 3 and 3 are fastened by fitting the rubber packing and the washer 5a and screwing and tightening the nut 6.

Further, as shown in FIG. 9, in the core-shaped segment 10 made of concrete, the box removing portion 10c formed on the inner surface thereof is used for bolt operation. A connection hole 10d is provided to connect the box removal portion 10c and the joint end surfaces 10 and 10b to pass the connection bolt 5, and like the flat plate segment 3, a connection bolt 5 with a washer 5a and a waterproof rubber packing is attached.
And the core type segments 10 and 10 are fastened by the nut 6.

Further, in the steel segment, a connection hole through which the connecting bolt 5 is inserted is provided in the joining end plate provided on the outer periphery of the steel segment heater, and the washer 5a and the waterproof rubber packing are attached similarly to the concrete segment. Steel segments are fastened to each other by connecting bolts 5 and nuts 6.

[Problems to be Solved by the Invention] By the way, in the configuration of the conventional joint portion, a connecting bolt, a nut, a washer, a rubber packing for waterproofing, etc. are required to fasten one place. Inventory control such as the number of parts carried in and the number of parts used, and the planning of carrying in are required, and the work at the site becomes complicated.

Also, in order to assemble the segments alternately, the joining end faces of the two segments are joined to the joining end faces of the one segment, and the ends of the two segments are joined together. Since the sealing material for stopping water is sandwiched between the joints of the parts, the center axis of the connection hole between the segments joining the side parts may be misaligned depending on how the sealing material is crushed, and the bolts may be inserted. It was hard to do.

Also, in the segment fastening work, it is necessary to fit the washer and the waterproof rubber packing to the bolt, pass through the connection hole of the joint part, further fit the waterproof rubber packing and the washer, and tighten the nut. It became a task and it was an element that was difficult to automate.

Therefore, connecting the segments takes time and labor,
In some cases, it could prolong the construction period of the tunnel.

The present invention has been made in view of the above circumstances, and an object thereof is to propose a structure of a joint portion of a segment that can simplify the connection work of the segment and save labor.

[Means for Solving the Problems] The structure of the segment joint portion of the present invention is a segment joint portion in which connecting bolts are passed through and screwed into connection holes provided in joint end faces of concrete segments to be connected to each other. In the above structure, one of the connection holes has a screw hole into which a connecting bolt is screwed.
The other connection hole is connected to a recess for bolt operation that opens on the inner surface of the concrete segment, and a part of the connection hole is a screw hole for temporarily fixing the bolt by screwing it. The connecting bolt is formed of a second sheath tube, and further, the connecting bolt is provided with a male screw portion in the vicinity of the front end portion and a tapered Taber portion is provided at the front end portion, and the male screw of the shaft body of the connecting bolt is provided. The diameter of the portion excluding the portion is formed to be smaller than the inner diameter of the second sheath tube, and the connecting bolt has the male screw portion that is previously inserted into the second sheath tube and formed near the tip portion. It is characterized in that it is housed in the connection hole in a state of being screwed into the screw hole for temporary attachment.

In addition, the structure of the segment joint part that connects the connecting bolts to the connecting holes provided in the joining end plates of the steel segments to be connected to each other by screwing the connecting bolts A first sheath tube having a screw hole communicating with the connection hole and screwing a connecting bolt is attached to the inner surface of the joining end plate that constitutes the steel segment, and the other steel segment is formed. On the inner surface of the joining end plate facing the connection hole, there is provided a second sheath tube having a screw hole communicating with the connection hole and temporarily fixing the connection bolt by screwing the connection bolt to the inner surface. Has a male screw portion formed in the vicinity of the tip portion and a tapered portion which is tapered at the tip portion. The diameter of the portion of the shaft body of the connecting bolt excluding the male screw portion is the inner diameter of the second sheath tube. The connecting bolt is inserted into the second sheath tube in advance, and the male screw portion formed near the distal end portion is screwed into the screw hole for temporary attachment, It is characterized in that it is housed in the connection hole.

[Operation] According to the above configuration, when the structure of the segment joint portion of the present invention is used, the connecting bolt having the washer and the waterproof rubber packing attached thereto is screwed to the second sheath tube in advance at the manufacturing site of the segment. By temporarily attaching them together, the segment and the connecting bolt can be integrated and carried in, so there is no need to carry in the connecting bolt separately at the tunnel construction site, and inventory management of equipment such as these connecting bolts is carried out. There is no need, and the segments can be fastened by simply tightening the connecting bolts of the segments when the segments are assembled.

Further, by providing a tapered portion at the tip of the connecting bolt, even if the central axes of the first sheath tube and the second sheath tube are slightly deviated from each other, the connecting bolt can be pushed in continuously while being rotated. The tapered portion of the connecting bolt is guided to the opening of the hole, the central axis of the connecting bolt is aligned with the communication axis of the second sheath, and the connecting bolt can be screwed into the second sheath tube.

[Embodiment] A first embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are drawings showing the structure of a concrete flat plate type segment joint portion.

The same elements as those of the conventional technique are designated by the same reference numerals as those in FIG. 8 and their description is omitted.

As shown in FIG. 1 and FIG. 2, the structure of the joint portion of the segment of this embodiment has four joint end faces 3a, 3a ..., 3b of the flat plate type segments 3 made of concrete to be joined.
Connection hole 16 opened in 3b ... and perpendicular to joint end faces 3a, 3b
And the connection hole 20 is formed. One of the connection holes 16 and 20 is composed of a first sheath tube 17 having a screw hole 17a that is screwed into the connecting bolt 15 to tighten the segments together.

At the rear end of the first sheath tube 17, a flat plate portion 17b is provided.
Is integrally attached to the main body of the sheath tube 17, and when the connecting bolt 15 is screwed and tightened, the flat plate portion 17b presses the concrete layer.

The opening 16a of the connection hole 16 is widened so that the joint bolt 15 can be easily inserted even if the center axis of the joint bolt 15 and the center axis of the connection hole 16 are slightly displaced.

The other connection hole 20 is formed so as to communicate between the recesses 3c, 3c for operating the connecting bolt 15 provided on the inner surface of the flat plate type segment 3 and the joint end surfaces 3a, 3b. The connection hole 20 includes a second sheath tube 19 having a screw hole 19a for temporarily fixing the connecting bolt 15, the second sheath tube 19 and the joint end surface 3
A free fitting hole 20b having an inner diameter larger than the inner diameter of the second sheath tube 19 is formed between the opening 20a provided in the a and 3b.

Connection bolt 15 for fastening the flat plate type segments 3 and 3
Is composed of a shaft body 15a and a nut 15b. A tapered portion 15c having a tapered tip is provided at the tip of the shaft body 15a, and the first and second sheaths 1 are provided behind the tapered portion 15c.
A male screw portion 15d that is screwed into the screw holes 17a and 19a of the screws 7 and 19 is provided, and the portion other than the male screw portion 15d of the shaft body 15a is the second sheath tube.
A male screw portion 1 that is formed to be thinner than the male screw portion 15d so that it can pass through the screw hole 19a of 19 and is screwed with the nut 15b at the rear end portion.
5e is provided, and the nut 15b is screwed into the male screw portion 15e.

The washer 21 and the waterproof rubber packing 22 are fitted into the connecting bolt 15, the connecting bolt 15 is passed from the connecting hole 20 to the connecting hole 16, and is screwed into the screw hole 17a of the first sheath 17 to be fastened. Segments 3, 3, ... Are concluded.

In order to fasten the flat plate type segment 3 using the structure of the segment joint portion of this embodiment, first, as shown in FIG. 2, at the manufacturing site of the flat plate type segment 3, the shaft body 15a of the connecting bolt 15 is attached. The joint end faces 3a and 3b are inserted into the joint hole 20, the waterproof rubber packing 22 and the washer 21 are fitted into the shaft body 15a from the recess 3c, and the nut 15b is screwed into the male screw portion 15e. Next, in the screw hole 19a of the second sheath 19, the connecting bolt 1
The male screw portion 15d of 5 is screwed in advance.

Next, this flat plate type segment 3 was carried into the tunnel construction site, and the joining end faces 3a and 3b of the flat plate type segments 3 and 3 to be joined were butted and temporarily fixed to the second sheath 19 of the flat plate type segment 3. By rotating the connecting bolt 15 and tightening it, the male screw part 15d of the joint bolt 15 becomes the second
It is disengaged from the screw hole 19a of the sheath 19 and screwed with the screw hole 17a of the first sheath 17 to fasten the flat plate type segments 3 to each other. At this time, the tapered portion 15 of the tip of the connecting bolt 15
Since c is guided to the opening 16a of the connection hole 20 so that the central axis of the connecting bolt 15 and the central axis of the first sheath 17 coincide with each other, by rotating and tightening the connecting bolt 15, It is accurately screwed into the screw hole 17a of the sheath 17.

According to the structure of the segment joint portion of this embodiment,
At the segment manufacturing site, the connecting bolt 15 in which the waterproof rubber packing 22 and the washer 21 are fitted is temporarily fixed to the first sheath 17, and the connecting bolt is carried in separately from the segment by carrying this to the site. Since it is not necessary, it is not necessary to manage the inventory of the connecting bolt 15, the nut 15b, the washer 21, and the waterproof rubber packing 22 at the tunnel construction site, and the material management at the tunnel construction site can be saved.

Further, in the conventional joint portion, the recess 3c, the washer 21, and the waterproof rubber packing 22 were required at both joint portions of the two flat plate type segments to be joined in order to tighten the bolt and the nut. In the case of the example, the two flat plate type segments 3 and 3 can be fastened by screwing the connecting bolt 15 into one of the first sheaths 17 of the two flat plate type segments. 21 and the waterproof rubber packing 22 need only be one, and the washer 21 and the waterproof rubber packing
The number of 22 can be halved.

Further, unlike the above-mentioned conventional technique, since no joint metal fitting is used, rust prevention measures can be simplified. Furthermore, since there is only one recess 3c for operating the connecting bolt 15 per fastening point, the time and effort required to fill the recess 3c with mortar can be reduced.

Further, since the tapered portion 15c is provided at the tip of the connecting bolt 15 and the inner diameter of the loose fitting hole 20b of the joint hole 20 is made wider than the inner diameter of the second sheath tube 19, the connecting hole 16 is connected to the central axis of the connecting hole 16. Even if the central axis of the hole 20 is slightly displaced, the tip of the connecting bolt 15 moves in response to the displacement of the connection hole 16 and the opening 16a of the connection hole 16 is moved.
Enter, and the tapered portion 15c is guided to this opening 16a,
By pressing the connecting bolt while rotating it, the central axes of the connecting bolt 15 and the second sheath 19 coincide with each other, so that the connecting bolt 15 can be tightened to fasten the flat plate-shaped segments 3 together.

As described above, the joining of the segments at the tunnel construction site can be simplified by only turning and tightening the temporarily fixed connecting bolts.

Therefore, the work is simplified, and the connecting bolt 15 can be tightened even if the central axes of the connecting bolt 15 and the second sheath 19 are slightly deviated from each other. This operation can be easily automated by using a robot or the like. , The labor shortage can be resolved.

In addition, since it is possible to speed up the construction of the tunnel by simplifying the work of joining the segments that had been rate-limiting, it is possible to shorten the overall construction period of the tunnel construction.

Therefore, the construction period can be shortened, labor can be saved, and automation can be performed, so that the tunnel construction cost can be significantly reduced.

The drawings shown in FIGS. 3 and 4 are drawings showing a second embodiment of the present invention, and show the structure of a joint portion of a concrete core type segment.

The same components as those in the conventional and the first embodiment are designated by the same reference numerals as those in FIGS. 1, 2, and 9 and their description is omitted.

In this embodiment, the structure of the joint portion of the core type segment 10 is made of concrete core type segment 1 to be joined.
Connection holes that open at the joint end faces 10a, 10a and the joint end faces 10b, 10b of 0, 10 ... And extend perpendicularly to the joint end faces 10a, 10b.
16 and a joint hole 20 are formed.

One of the connecting holes 16 and 20 has the same structure as the connecting hole 16 of the above-described embodiment.

The other connecting hole 20 communicates between the box-out portion 10c formed on the inner surface of the inner core type segment 10 instead of the recess 3c of the flat plate type segment 3 and the joining end faces 10a, 10a and 10b, 10b. However, in order to use the connecting bolt 15 of a predetermined length, except that a counterbore 20c for housing the washer 21 and the nut 15b is provided in the opening on the side of the box removing part 10c, the connection hole of the above embodiment It has the same structure as 20.

A connecting bolt for connecting the core type segment 10 of this embodiment
15 has the same structure as the connecting bolt 5 of the above-mentioned embodiment.

The segment joining method according to the structure of the segment joint portion of this embodiment is the same as that of the above-described embodiment, and the core-type segment 10 can also achieve the same effect as the flat plate-type segment.

The drawings shown in FIGS. 5 and 6 are drawings showing a third embodiment of the present invention and showing the structure of the joint portion of the steel segment.

The same components as those of the conventional example and the first example are designated by the same reference numerals and the description thereof will be omitted.

Both of the pair of steel segments 25 to be connected have a joining end plate provided on the outer circumference of the steel segment 25 main body.
26 are provided with joining holes 26a, 26a ... And joining holes 26b, 26b ..
The inner surface facing the joint hole 26a of the joint end plate 26 provided with one of the joint holes 26a and 26b has the first
A first sheath tube 17 similar to that of the above embodiment is attached by welding vertically to the joint end plate 26 with the opening facing the connection hole 26a.

A second sheath tube 19 similar to that of the first embodiment is welded perpendicularly to the joint end plate 26 on the inner surface of the joint end plate 26 provided with the other connection hole 26b and facing the joint hole 26b. Installed.

Connecting bolt 15 for connecting the steel segments 25, 25
Has the same configuration as that of the first embodiment.

The method of joining steel segments using the structure of the segment joint portion of one embodiment is the same as that of the first embodiment. Even when joining the steel segments 25, 25, the first and second concretes are joined together. The same effect as the manufactured segment can be obtained.

In the event of an earthquake, the joint surfaces of the segments 3, 10, 25 may be displaced. In this case, it is advantageous that the connecting bolt 15 is long. The long connecting bolt 15 can be used by lengthening the pipe 17 and providing the portion of the screw hole 17a of the sheath pipe 17 in the inner part of the first sheath pipe 17.

By injecting grease or the like into the first sheath tube 17 in advance, when the connecting bolt 15 is tightened into the first sheath tube 17, the first and second sheath tubes 17 and 19 are connected. Grease wraps around between the bolts 15, so that it is possible to easily prevent the connection bolt 15 and the inner surfaces of the first and second sheath tubes 17 and 19 from being rusted.

In the flat plate type segment 3, when it is desired to make the recess 3c for operating the connecting bolt 15 small or to make the connecting bolt 15 short, the washer 21 and the nut are provided in the opening of the connecting hole 20 on the side of the recess 3c. A counterbore for accommodating the 15b is provided, and the counterbore can be made deeper to cope with this.

[Effects of the Invention] As described in detail above, according to the structure of the segment joint portion of the present invention, since the tapered portion is provided at the tip portion of the connecting bolt, when joining the segments made of concrete, Even if the central axes of the joint holes provided in the joint end faces of the segments to be joined are slightly deviated from each other, the tapered portion is guided to the opening portion of the first sheath tube by simply pressing the joint bolt while rotating it, and the joint portion is joined. The central axes of the bolt and the first sheath tube can be aligned.

In addition, before the segment is carried into the tunnel construction site, by temporarily fixing the connecting bolt with the washer and the waterproof rubber packing to the second sheath tube in advance, the segment joint end faces were abutted at the tunnel construction site. After that, the segments can be joined to each other simply by tightening the connecting bolt which is temporarily fixed to the second sheath tube. Therefore, at the tunnel construction site, connecting bolts,
Inventory management of washers and waterproof rubber packing becomes unnecessary,
Further, since the segments can be fastened simply by tightening the connecting bolts, the segment joining work can be greatly simplified, labor saving and speedy.

Further, since the connecting bolt is screwed into the temporary screw hole of the second sheath tube and is housed in the connecting hole, the connecting bolt moves and moves in the connecting hole during transportation and installation of the segment. It is possible to prevent the protrusion from the connection hole.

As a result, during transportation, the connecting bolt moves and interferes with the surroundings of the connection hole, causing damage and damage to the segment and the connecting bolt, and during installation, the connecting bolt protruding from the connecting hole interferes with other segments. Also, various obstacles such as breakage / damage of connecting bolts and interruption of work can be reliably prevented.

In addition, since it is possible to speed up the joining work of the segments, which takes time in the tunnel construction, the construction period of the tunnel construction can be shortened.

Further, since the segments can be joined simply by tightening the connecting bolt, this work can be easily automated.

As described above, the segment joining work is simplified, labor is saved,
By speeding up, automating and shortening the tunnel construction period, the tunnel construction cost can be significantly reduced.

Further, also in the steel segment, by providing the first and second sheaths and using the connecting bolt,
The same effect as that of the concrete segment can be obtained.

[Brief description of drawings]

1 and 6 are drawings showing an embodiment of the present invention, in which FIG. 1 is a perspective view of a main part with a part thereof showing a joined flat plate type segment made of concrete, and FIG. 2 is a flat plate. Sectional view showing the structure of the joint portion of the mold segment, FIG. 3 is a perspective view showing a part of the connected concrete core-shaped segment, which is partially cut away, and FIG. 4 is a joint portion of the core-shaped segment. FIG. 5 is a cross-sectional view showing the structure, FIG. 5 is a perspective view of a main part of the joined steel segments with a part thereof being cut away, and FIG. 6 is a cross-sectional view showing the structure of a joint portion of the steel segments, FIGS.
FIG. 7 is a view showing a conventional technique, FIG. 7 is a perspective view of a main part showing a tubular wall body assembled by flat plate segments, FIG. 8 is a perspective view showing a flat plate segment, and FIG. The perspective view which shows a core type segment. 3 ... Flat plate type segment, 3a ... Joining end face, 3b ... Joining end face, 3c ... Recess, 4 ... Fitting metal fitting, 10 ... Core type segment, 10a ... Joining end face, 10b ... Joining end face , 10c ……
Box removal part, 15 ... Connection bolt, 15a ... Shaft, 15b ... Nut, 15c ... Tapered part, 16 ... Connection hole, 17 ... First
Sheath tube, 17a ... screw hole, 19 ... connection hole, 19a ... screw hole, 20 ... second sheath tube, 21 ... washer, 22 ...
Waterproof rubber packing, 25 …… Steel segment, 26 ……
Junction end plate, 26a ... Connection hole, 26b ... Connection hole.

Claims (2)

[Claims] 1. A structure of a segment joint portion in which connecting bolts are passed through and screwed into connection holes provided in joint end faces of concrete segments to be connected to each other, and one of the connection holes is connected. The hole is constituted by a first sheath tube provided with a screw hole into which a connecting bolt is screwed, and the other connecting hole communicates with a recess for bolt operation opened on the inner surface of the concrete segment and is connected to the connecting hole. Part of the connecting bolt is formed of a second sheath tube provided with a screw hole for temporarily fixing the connecting bolt, and further, the connecting bolt has a male screw portion formed in the vicinity of the front end and has a front end. Is provided, and the diameter of the portion of the connecting bolt excluding the male screw portion is formed to be smaller than the inner diameter of the second sheath tube. The segment joint, which is inserted into the second sheath tube and is housed in the connection hole in a state in which the male screw portion formed near the tip portion is screwed into the screw hole for temporary attachment. Structure of the department. 2. A connecting bolt is passed through a connecting hole provided in a joining end plate of steel segments to be connected to each other,
A structure of a segment joint portion for connecting the connection bolts by screwing, the inner surface facing the connection hole of the joining end plate constituting one steel segment to be connected is connected to the connection hole and the connection bolt A first sheath tube having a screw hole for screwing is attached to the inner surface of the joint end plate constituting the other steel segment facing the connection hole, and a connecting bolt is screwed to the inner surface so as to communicate with the connection hole. A second sheath tube having a screw hole for fixing and temporarily fixing is provided, and further, the connecting bolt is provided with a male screw portion in the vicinity of the distal end portion and a tapered portion which is tapered at the distal end portion. The diameter of the portion of the connecting bolt excluding the male screw portion of the shaft body is formed to be smaller than the inner diameter of the second sheath tube, and the connecting bolt is inserted into the second sheath tube in advance and has a tip end. Near the section A segment joint structure, wherein the formed male screw portion is housed in the connection hole in a state of being screwed into the temporary mounting screw hole.