JPH04289399A - Joint of segment using shape steel - Google Patents

Abstract

PURPOSE:To reduce the number of welding positions and to reduce the cost by making a part or all of the constituent members of joint boxes of concrete segments or composite segments as a shape steel. CONSTITUTION:Channel steels 12 having a bolt hole 10 on a web and the flange ends of channel steels 11 having no bolt hole are butted to each other to form joint boxes 3 by welding. The web having the bolt hole 10 of the channel steels 12 corresponds to a joint plate in the existing joint boxes, and the web having no bolt hole of the channel steels 11 corresponds to the rear side plate of the existing joint boxes. Segments are connected to each other with a bolt 7 and a nut 8 inserted into the bolt hole 10 of the channel steels 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for concrete or composite segments used in shield construction methods.

0002

2. Description of the Related Art When constructing tunnels for sewers, public ditches, railways, etc. using the shield construction method, the tunnels are constructed by connecting a large number of arc-shaped segments.

In addition to steel segments, the segments include a concrete segment 1 as shown in FIG. 8, a steel-concrete composite segment 2 as shown in FIG. 9, and the like.

By the way, with regard to joints for concrete segments 1 or synthetic segments 2, a joint box 3 is generally provided at the segment joint. For example, as shown in FIG. 10, the conventional joint box 3 is made by joining four steel plates, such as a joint plate 6 with bolt holes 10, left and right joint box side plates 5, 5', and a rear side plate 4 of the joint box, by welding or the like. A bolt tightening space is formed inside thereof, and a bolt passed through the bolt hole 10 is tightened with a nut to connect the segments.

[0005]

[Problem to be solved by the invention] One segment is
Typically, there are approximately 10 joints, so a considerable number of joints are required to construct one tunnel ring. Therefore, in addition to satisfying specified strength, rigidity, and water-stop properties, joints must
Economical is required.

[0006] However, conventional joints have not always been satisfactory in terms of cost, such as those made by joining and assembling steel plates by welding or the like, or those manufactured by casting or forging, as described above.

The object of the present invention is to provide a joint for concrete segments and synthetic segments that is more economical than conventional steel plate welding assembly, casting, and forging.

[0008]

[Means for Solving the Problems] The present invention provides a joint for concrete segments or synthetic segments in which a joint box is provided inside the segment joint end face to form a bolt tightening space, in which part or all of the constituent members of the joint box are shaped. It is made of steel.

[0009] As the shaped steel, for example, channel steel or H-shaped steel can be used, and by effectively using these, the number of welding points can be reduced and costs can be reduced.

[0010] As a structure using channel steel, the flanges of a channel steel with bolt holes provided in the web and a channel steel without bolt holes are joined by butting each other, and a channel steel with bolt holes is formed. There is a type in which a joint box is constructed by positioning a steel web on the segment joint end face side. Further, instead of using a channel steel without bolt holes, a steel plate forming the rear side plate of the joint box may be welded to the flange tip of the channel steel provided with bolt holes.

Furthermore, as a joint for a synthetic segment,
If high strength and high rigidity are required, use a channel steel with bolt holes on the outside of the channel steel with bolt holes for the joint formed by butting the channel steels together. The webs of channel steel are overlapped and joined in the same direction, and the webs of channel steel joined on the outside are positioned on the end face side of the segment joints,
A conceivable structure is such that a sheath pipe is provided between the bolt holes of both channel steels provided with bolt holes, and the space between the two channel steels is further filled with grout material. In this case, the member equivalent to a conventional joint plate is composed of two channel steel webs and grout material sandwiched between them, and is difficult to deform even if a large tensile force is applied to the joining bolts. A high-strength, high-rigidity joint.

Furthermore, a structure similar to this can be constructed by a combination of H-beam steel, steel plate, channel steel, or the like.

[0013]

[Embodiment] Next, the illustrated embodiment will be explained.

FIG. 1 shows an embodiment in which the present invention is used as a joint for sandwich-type steel-concrete composite segments, and FIG. 2 shows the structure and joint state of only the joint. In Fig. 1, 21 is a steel plate on the tunnel earth side, 22 is a steel plate on the hollow side of the tunnel, and 23 is both steel plates 21, 22.
This is concrete poured in between.

In this embodiment, a joint box 3 is formed by welding the flange ends of a channel steel 12 with bolt holes 10 provided in the web and a channel steel 11 without bolt holes abutted against each other. A web of channel steel 12 provided with bolt holes 10 corresponds to a joint plate in a conventional joint box, and a web of channel steel 11 without bolt holes corresponds to a rear side plate of a conventional joint box. The joining method using bolts 7 and nuts 8 is the same as that of conventional joints, and 9 in the figure
indicates a washer.

In the case of concrete segments, the joint box 3 can have a similar structure and is embedded in the joint of the concrete segments.

FIGS. 3 to 6 show the structure and joint state of only the joint portion in other embodiments.

FIG. 3 shows an embodiment in which there is a concern about cross-sectional loss due to the joint box. In this embodiment, a steel plate is used as the rear side plate 4 of the joint box in place of the channel steel 11 on the rear side of the joint box in the embodiments shown in FIGS. 1 and 2, and the bolt tightening space inside the joint box 3 is made smaller. . In this case, the flanges of the channel steel 12 provided with the bolt holes 10 correspond to the joint box side plates in a conventional joint box, and both ends of the joint box rear side plate 4 are welded to the tips of both flanges.

FIG. 4 shows an embodiment where high strength and high rigidity are required, mainly as joints for synthetic segments. The joint of this embodiment is a channel steel 12 provided with bolt holes 10 in the embodiments of FIGS. 1 and 2.
Then, channel steels 13 having the same bolt holes 10 are welded so as to overlap in the same direction, and a sheath pipe 14 is provided between the bolt holes 10 of both channel steels 12 and 13. It is formed by filling the spaces between the holes 13 with grout material 17. In the figure, reference numeral 15 denotes a grout injection hole 15 provided in a steel plate on the hollow side of the tunnel (not shown in the figure) of the composite segment. Note that in this type, the bolt tightening space inside the joint box 3 is smaller than the length of the bolt 7, so it is necessary to incorporate the bolt 7 during manufacturing.

FIG. 5 shows the embodiment shown in FIG. 4 in which the bolt tightening space inside the joint box 3 is enlarged by using two different sizes of section steel so that the bolts 7 can be inserted during construction of the segment. That is, the channel steel 11 on the rear side of the joint box that surrounds the bolt tightening space and the channel steel 12 provided with bolt holes 10 have long flanges, and the channel steel 12 provided with bolt holes 10 on the joint end surface side is used. For No. 13, a short flange length is used.

FIG. 6 shows an embodiment in which an H-shaped steel 16 having bolt holes 10 is used instead of the double channel steels 12 and 13 superimposed on each other in the embodiment shown in FIG. 5, and a steel plate is used as the joint plate 6.

The embodiment shown in FIG. 7 is also primarily intended for sandwich-type synthetic segments. In this embodiment, the flange connects the earth side steel plate 21 and the inner space side steel plate 22,
The H-beam 18 is installed so that its web is parallel to both steel plates 21 and 22. A joint plate 6 having bolt holes is provided on the segment joining end surface side of the H-section steel 18, a joint box rear side plate 4 is provided on the opposite side, and a joint box front side plate 19 having bolt holes is provided on the bolt tightening space side of the joint plate 6. are joined by welding, etc. A highly rigid joint is formed by providing a sheath pipe 14 between both bolt holes in the joint plate 6 and the front side plate 19 of the joint box, and performing grouting through a grout injection hole 15 provided in the inner steel plate.

[0023]

[Effects of the Invention] ■ By using section steel for the joint box part, the number of welding points can be reduced and costs can be reduced.

[0024] By reducing the cost of the joint, it is possible to significantly reduce the cost of the entire segment.

[0025] Since there are fewer welding points, there are fewer problems related to weldability, and a highly reliable joint can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a joint of the present invention.

FIG. 2 is a plan view of only a joint portion showing another embodiment.

FIG. 3 is a plan view of only a joint portion showing another embodiment.

FIG. 4 is a plan view of only a joint portion showing another embodiment.

FIG. 5 is a plan view of only the joint portion showing another embodiment.

FIG. 6 is a plan view of only a joint portion showing another embodiment.

FIG. 7 is a perspective view showing another embodiment.

FIG. 8 is a perspective view showing an example of a conventional concrete segment.

FIG. 9 is a perspective view showing an example of a composite segment.

FIG. 10 is a perspective view showing a typical joint in a conventional segment.

[Explanation of symbols]

Claims (6)

[Claims] 1. A joint of segments that is provided with a joint box that forms a bolt tightening space inside the segment joint end face, wherein a part or all of the constituent members of the joint box are formed of a section steel. Segment fitting using. 2. The joint box is formed by joining a channel steel web with bolt holes and a channel steel without bolt holes by butting the flange ends of each other, and connecting the web of the channel steel with bolt holes. 2. The segment joint using section steel according to claim 1, wherein the segment joint is located on the end face side of the segment joint. 3. In the segment joint using the section steel according to claim 2, in place of the channel steel without bolt holes,
A segment joint using a section steel, characterized in that a steel plate constituting a rear side plate of a joint box is used, and both ends of the steel plate are joined to the tip of a flange of a channel steel provided with the bolt holes. 4. The joint box is formed by joining a channel steel with bolt holes in the web and a channel steel without bolt holes by butting the flange ends of each other, and connecting the channel steel with the bolt holes to the outside of the channel steel. , the channel steels having the same bolt holes are overlapped and joined in the same direction, and the web of the channel steel joined to the outside is located on the end face side of the segment joint,
Claim 1 characterized in that a sheath pipe is provided between the bolt holes of both channel steels provided with bolt holes, and further a space between both channel steels provided with the bolt holes is filled with grout material.
Segment joints using the listed steel sections. 5. In the segment joint using the section steel according to claim 4, an H section steel having bolt holes in the web is used instead of the double groove section steel provided with bolt holes, and the H section steel has bolt holes. The ends of one side of both flanges and the ends of the flanges of the channel steel without bolt holes are butted together and joined, and the ends of the other side of both flanges of the H-shaped steel are provided with bolt holes located on the segment joint end faces. A shape characterized by joining steel plates, providing a sheath pipe between the bolt hole of the H-shaped steel and the bolt hole of the steel plate, and further filling a space between the web of the H-shaped steel and the steel plate with grout material. Segment joints using steel. 6. The segment is a sandwich-type steel-concrete composite segment in which concrete is cast between a steel plate on the tunnel earth side and a steel plate on the inner tunnel side, and the joint box has a flange that is connected to the steel plate on the tunnel earth side and the steel plate on the tunnel earth side. An H-shaped steel that connects steel plates on the hollow side of the tunnel and is installed so that its webs are parallel to both steel plates, and a joint box that is located closer to the bolt tightening space of the joint plate located on the segment joint end face side of the H-shaped steel. It consists of a front side plate and a rear side plate of the joint box located on the opposite side to the joint plate, and a sheath pipe is provided between the bolt holes provided in the joint plate and the front steel plate of the joint box, and the joint plate and the front side of the joint box A segment joint using shaped steel characterized by filling the space between steel plates with grout.