JPH11210389A - Coupling part reinforcing structure of steel segments - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of reinforcing a coupling part when a vertical shaft or a tunnel is constructed, in which a hollow cylinder consisting of a plurality of steel segments coupled together is inserted by forced fitting into the ground. SOLUTION: Along main girders 3 or join plates 5, reinforcing metal fittings 21 and 23 are furnished to prevent the joined faces of main girders 3 or joint plates 5 from being opened in the condition that steel segments 1 are coupled together. Each main girder 3 or joint plate 5 has a structure as protruding to outside a skin plate 9, and grooves 25 in the metal fittings 21 and 23 are fitted on the protruding part as a join. In the fit condition, a bolt is inserted through each bolt hole furnished in the metal fittings and skin plate 9, and the metal fittings 21 and 23 are attached by fastening with a nut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a connecting portion of a steel segment constituting a hollow cylindrical body for constructing a shaft or a tunnel underground.

[0002]

2. Description of the Related Art For example, a shaft called a starting shaft or a reaching shaft of a shield machine constructed when a subway or a sewer is constructed underground is constructed by constructing a hollow cylinder underground. It may sink. This subsidence
This is performed by vertically pressing the hollow cylinder and applying a pressure input from above, and excavating the ground inside the hollow cylinder.

[0003] This hollow cylindrical body is usually a cast-in-place concrete structure or the like, but is constituted by connecting a large number of steel segment pieces, and sometimes a so-called steel segment is used. That is, the hollow cylindrical body is divided into a plurality of rings in the axial direction of the cylindrical body, and a steel segment piece having a shape obtained by further dividing the ring in the circumferential direction,
A hollow cylinder is constructed while being connected in the circumferential direction and axial direction, and press-fitting and excavation are performed.

FIG. 9A shows such a steel segment piece. The steel segment piece 1 includes a main girder 3, a joint plate 5, a vertical rib 7, and a skin plate 9. That is, the main girder 3 is long in the circumferential direction of the cylindrical body, and a pair of upper and lower members are arranged substantially in parallel.

[0005] Both ends of the two main girders 3 are connected by a joint plate 5 in which a pair of left and right is arranged substantially in parallel. Further, a plurality of substantially parallel vertical ribs 7 are connected to an intermediate portion of the main girder 3. A skin plate 9 is stretched outside the main girder 3, the joint plate 5, and the vertical rib 7. These members 3, 5, 7, and 9 are joined by welding.

The main girder 3 and the joint plate 5 are provided with bolt holes 1.
1 are formed, and the adjacent steel segment pieces are connected by connecting the bolt holes to each other and being bolted. The illustrated steel segment piece includes a joint plate 5.
Are provided in parallel with the main girder 5.

Further, a patch plate 14 is attached to the inside of the steel segment piece 1 to prevent the bucket from being caught by the reinforcing girder 13 and interfered with when a bucket or the like of a heavy excavator comes into contact.

When a horizontal force due to an earthquake or the like is applied to an underground submerged body (see FIG. 1) constructed by connecting the steel segment pieces as described above, the hollow cylindrical body 15 constituting the underground submerged body is affected. A bending moment is applied. Due to the bending moment M, there is a possibility that the connecting portion of each steel segment piece 1, that is, the mating surface between the main girders 3 and the main girders 3 is opened (FIG. 9B), and the connecting strength is not sufficient.

Due to the low connection strength and the problem of durability due to the connection strength, the hollow cylindrical body 15 composed of steel segment pieces or the like generally has a so-called earth retaining material or concrete during excavation. Is considered as a formwork material for placing concrete, and the strength of the finally constructed underground structure is often not included in the strength calculation. That is, it is for temporary construction, not for main construction.

Therefore, it is conceivable to increase the number of bolt holes 11 to increase the connection strength so that the mating surface is not opened, the connection strength is improved, and the durability is improved.

As another means for increasing the connection strength,
As shown in FIG. 10, a steel segment piece 1 having a connection joint by friction joining using an attachment plate (not shown) has been proposed (JP-A-2-112521).

That is, the tip of the main girder 3 and the tip of the vertical rib 7 are made to protrude from the vertical rib 7 and the main girder 3, respectively. At this time, these protruding portions 17 are butted, an abutment plate (not shown) is overlapped on the abutted portion from both sides to form a sandwich structure, and bolts are formed from bolt holes formed in the abutment plate to the bolt holes 11. And the connection is performed by fastening a number of bolts.

In the above description, mainly the connection strength at the mating surface between the main girders 3 has been described, but there is also a demand for similarly increasing the connection strength at the mating surface between the joint plates 5.

[0014]

However, in the method of increasing the connection strength by increasing the number of bolts, the number of bolts to be fastened in the field work for connecting the steel segment pieces increases, and there is a limit to increasing the strength. was there. That is, if the number of bolts is increased too much, the bolt holes come too close to each other, and the strength is reduced on the contrary.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a steel segment connecting portion reinforcing structure capable of further improving the connecting strength without increasing the number of bolts. .

[0016]

In order to achieve the above object, according to a first aspect of the present invention, a plurality of steel segment pieces are connected to each other to form a hollow cylinder, and each steel segment piece is A main girder having a shape in which a hollow cylindrical body is divided into a plurality of rings in the axial direction of the cylindrical body, and the ring is divided in a circumferential direction, and a pair of the long longitudinally extending hollow cylindrical bodies are arranged substantially in parallel. And, a joint plate in which a pair of left and right connecting both ends of both main girders are arranged substantially in parallel, a plurality of substantially parallel vertical ribs connected to a central portion of both main girders, and these main girders, joint plate, And a skin plate that is stretched over the vertical ribs, and a connecting portion reinforcing structure of a steel segment configured to have a mating surface between the main girders or the joint plates that are mated in the connected state. Reinforcement fittings to prevent the main girder or joint plate from opening Along a connecting portion reinforcing structure of the steel segments, characterized in that provided.

According to a second aspect of the present invention, the main girder or the joint plate protrudes outside the skin plate, and the reinforcing fitting is fitted in a groove fitted in the protruding portion in a fitted state. A bolt hole for being bolted to the skin plate in a state, wherein a skin bolt hole communicating with the bolt hole is formed in the skin plate. Structure.

According to a third aspect of the present invention, the skin plate has a through hole or a notch formed at a position immediately inside the main girder or the joint plate. A pair of tongues that penetrate through the through holes or cutouts that will be located in pairs with a girder or joint plate in between, and that fit into the fitted main girder or joint plate, and the skin in this fitted state A bolt hole for being bolted to the plate; and a skin bolt hole formed in the skin plate to communicate with the bolt hole.

According to a fourth aspect of the present invention, a bolt hole is formed in the skin plate at a position just inside the main girder or the joint plate, and the reinforcing metal fittings sandwich the fitted main girder or the joint plate. A pair of stud bolts penetrating through the bolt holes, auxiliary metal fittings penetrating through the pair of stud bolts, and the main girder or joint plate fitted by being fastened to the tip of the stud bolts And a nut for pressing the auxiliary metal fitting to fix the reinforcing metal fitting to an inner end face of the steel segment.

According to a fifth aspect of the present invention, the skin plate further includes a skin bolt hole formed at a position immediately inside the main girder or the joint plate, and the vertical rib has a substantially L-shaped bent inner end. Rib bolt hole is formed at a position facing the bolt hole in the bent portion,
The reinforcing fitting is a pair of stud bolts penetrating through the bolt hole and the rib bolt hole which are positioned as a pair with the fitted main girder or joint plate interposed therebetween, and the reinforcing fitting is fastened to a tip of the stud bolt. And a nut for fixing the connecting portion.

In a sixth aspect of the present invention, the stud bolt is provided with two pairs, and each pair of stud bolts is provided with the vertical rib interposed therebetween. is there.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure for reinforcing a connecting portion of a steel segment according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1 (A), a hollow cylindrical body 15 laid underground is formed by connecting a number of steel segment pieces 1 to each other. The hollow cylindrical body 15 is divided into a plurality of rings in the axial direction of the cylindrical body, and each of the steel segment pieces 1 has a shape obtained by dividing the ring shape in the circumferential direction.

As shown in FIG. 2A, each steel segment piece 1 includes a main girder 3, a joint plate 5, a vertical rib 7, and a skin plate 9.

That is, a pair of main girders 3 that are long and curved in the circumferential direction of the hollow cylindrical body 15 are arranged substantially in parallel. The left and right joint plates 5 connect both ends of the two main girders 3. The joint plate 5 is disposed substantially parallel to the left and right vertical directions. A plurality of vertical ribs 7 are connected to a central portion of both main girders 3. Each vertical rib 7 is arranged substantially in parallel with each other. A skin plate 9 is stretched over the main girder 3, the joint plate 5, and the vertical rib 7.

A plurality of reinforcing girders 13 for connecting the central portion of the joint plate 5 are provided in parallel with the main girders 5. Furthermore, a patch plate 14 is attached to the inside of the steel segment piece 1, and when a bucket or the like of a heavy excavator comes into contact with the steel segment piece 1, the bucket is prevented from being hooked on the reinforcing girder 13 or the like and tilting. .

Now, the main girder 3 and the joint plate 3 have a structure in which the outer portions project outside the skin plate 9 by a predetermined dimension. Reinforcing fittings 21 and 23 are attached to the protruding portions 17 and 19. That is, the reinforcing brackets 21 and 23 include a curved one 23 for the main girder and a one 21 for the joint plate.

As shown in FIG. 3, the cross sections of the reinforcing metal fittings 21 and 23 have a flat trapezoidal shape arranged along the skin plate 9. The trapezoidal shape can reduce friction with the ground when the hollow cylinder is pressed into the ground. A groove 25 is formed in the lower bottom portion of the trapezoid.

The groove 25 is formed in the longitudinal direction of the reinforcing metal fittings 21 and 23, and has such a size that the main girder 3 or the projecting portions 17 and 19 of the joint plate 5 can be fitted together. .

A pair of bolt holes 27 sandwiching this groove 25
Are formed penetrating from the upper base to the lower base of the trapezoid. This bolt hole 27 is provided with a bolt head 31 of a bolt 29 to be penetrated.
Is enlarged in diameter. At a position corresponding to this bolt hole 27, skin plate 9 also has skin bolt hole 3
3 is formed.

The bolt holes 27 and 33 communicate with each other when the reinforcing members 21 and 23 are attached. The bolt head 31 of the bolt 29 to be used has a prismatic fitting hole 35 having a regular polygonal cross section so that the bolt can be easily fastened.
Are formed, and a jig having a similar shape is fitted, so that the bolt 29 can be easily rotated.

As shown in FIG. 2A, the main girder 3 and the joint plate 5 are provided with bolt holes 11 for connection as in the prior art.
Is formed.

The reinforcing member 21 for the main girder and the reinforcing member 23 for the joint plate are welded 39 together. This welding 39 may be performed directly to each other as shown in FIG. 1B, or a reinforcing metal fitting 37 dedicated to connection may be used as shown in FIG. That is, it is possible to use a reinforcing bracket 37 having a substantially T-shape and weld 39 the reinforcing bracket 21 for the main girder or the reinforcing bracket 23 for the joint plate to the tip of each side of the T-shape.

(Operation of the Embodiment) In the connecting operation of the steel segment pieces 1, the main girder 3 or the joint plate 5 of the adjacent steel segment pieces 1 to be connected are joined together.
The bolt 36 is passed through the communicating bolt holes 11 and 11 and the nut 38 is fastened.

Further, with the projecting portions 17 and 19 of the main girder 3 or the joint plate 5 being joined together,
1 and 23 are fitted into the grooves 25. Then, the bolt 29 is passed through the communicating bolt hole 27 and the skin bolt hole 47, and a jig is fitted into a fitting hole 35 formed in the bolt head 31 of the bolt 29 and rotated.
0, and the reinforcing fittings 21 and 23 are attached and fixed.

Thereafter, the reinforcing member 21 for the main girder and the reinforcing member 23 for the joint plate are welded 39 to each other in the attached state.

(Effects of Embodiment) According to the above embodiment, the main beams 3 or the joint plates 5 in the fitted state are
By fitting into the grooves 25 of the reinforcing fittings 21 and 23, it is possible to strongly prevent the mating surface from being opened, and to obtain a large connection strength with a simple structure.

(Other Embodiments) In the above embodiment, the protruding portion 1 of the fitted main girder 3 or the joint plate 5 is used.
Reinforcing metal fittings 21, 23 having grooves 25 to be fitted in 7, 19
In order to use, the main girder 3 or the joint plate 5 had a special structure protruding outside the skin plate 9. However, in another embodiment, it is possible to eliminate the need to perform the processing for forming such a special structure on the steel segment piece 1.

That is, as shown in FIG. 4, for example, the main girder 3 or the joint plate 5 stops inside the skin plate 9 and forms a through hole 41 in the skin plate 9 instead. The through hole 41 is formed just inside the main girder 3 or the joint plate 5, that is, in the plane of the skin plate 9 and on the center side of the skin plate 9. A plurality of such through holes 41 are formed along the circumferential direction or the axial direction of the steel segment piece 1.

When the main girder 3 or the joint plate 5 is joined in a state where the steel segment pieces 1 are connected, these through holes 41 are located in pairs with the joined main girder 3 or the joint plate 5 interposed therebetween. Will be.

The tongues 43 penetrating through the through holes 41 located in these pairs are provided in the reinforcing fittings 21 and 23 in pairs. Therefore, when the tongue portion 43 penetrates into the through hole 41, the pair of tongue portions 43 fits with the fitted main girders 3 or the joint plates 5.

As described above, the through holes 41 are formed in the skin plate 9.
Forming the main girder 3 or the joint plate 5 as shown in FIG.
Is more easily applied to the steel segment piece 1 than to project it, and the steel segment piece 1 having the conventional structure can be used almost as it is.

Further, in the reinforcing member 21 for the main girder, by providing a plurality of tongue portions 43 intermittently in the circumferential direction of the steel segment piece 1, the entire reinforcing member 21 is bent as compared with a case where the reinforcing members 21 are provided continuously. The manufacturing process becomes easy.

In the above embodiment, the reinforcing metal fitting 2
1 and 23 have grooves 25, but in other embodiments, they are not necessarily limited to those having grooves. For example, as shown in FIGS.
The reinforcing bracket 45 may have a structure in which a force for opening the mating surfaces of the members is received as a pulling force.

That is, the main girder 3 is attached to the skin plate 9.
Alternatively, the skin bolt hole 47 is formed just inside the joint plate 5. A stud bolt 49 penetrating through the skin bolt hole 47 is formed at a right angle in the plate-like reinforcing metal member 45. The stud bolts 49 are provided in pairs corresponding to the skin bolt holes 47 that are to be located in pairs with the main girder 3 or the joint plate 5 being fitted.

Then, a plate-shaped auxiliary metal fitting 51 is arranged in parallel with the reinforcing metal 45. This auxiliary fitting 51
Also, two bolt holes 53 through which the stud bolt 49 passes are formed.

Then, after the stud bolt 49 passes through the skin bolt hole 47 of the skin plate 9 and the bolt hole 53 of the auxiliary metal fitting 51, a nut 55 is fastened to the tip. By fastening the nut 55, the auxiliary metal fitting 51 is pressed against the main girder 3 or the inner end face 57 of the joint plate 5, and the reinforcing metal 45 is firmly fixed to the skin plate 9 by the reaction force of this pressing.

According to this embodiment, the force for opening the mating surface between the main girders 3 or the joint plates 5 is applied to the plate-like through the skin bolt holes 47 and the stud bolts 49 formed in the skin plate 8. Is received as a pulling force by the reinforcing metal member 45 and the auxiliary metal member 51.

Then, it is only necessary to form the skin bolt holes 47 in the skin plate 9 of the steel segment piece 1 having the conventional structure, and it is not necessary to apply a large processing to the structure of the steel segment piece 1.

The stud bolt 49 provided on the reinforcing member 45 of the embodiment shown in FIGS. 5 and 6 penetrates through the auxiliary member 51 and is fastened to the nut 55. In other embodiments, the stud bolt 49 is provided. Alternatively, as shown in FIG. 7, the nut may be fastened to the nut 55 through the vertical rib 7.

That is, the main girder 3 is provided on the skin plate 9.
Or, at the position just inside the joint plate 5, the skin bolt hole 47
Is formed. The vertical rib 7 has a substantially L-shaped cross-sectional shape in which the inner end is bent, as is conventionally present.

The skin bolt hole 47 is formed in the bent portion 7A.
A rib bolt hole 59 is formed at a position opposed to. The nut 55 is fastened to the tip of the stud bolt 49 through the skin bolt hole 49 and the rib bolt hole 59.

According to the embodiment of FIG. 7, the auxiliary fitting 5
1 (FIGS. 5 and 6) is omitted, the number of parts can be reduced correspondingly, and work on site can be facilitated.

The reinforcing fitting 45 of the embodiment shown in FIG.
The stud bolts 49 provided on the pair are provided in pairs, but in other embodiments, as shown in FIG.
It is also possible to provide two pairs of stud bolts 63 at the same time.
That is, two pairs of stud bolts 63 are provided in the circumferential direction of the steel segment piece 1 with respect to the plate-shaped reinforcing metal member 61, so that a total of four stud bolts 63 can be provided.

The skin bolt hole 4 formed in the skin plate 9 is provided so that the reinforcing bracket 61 is provided with the pair of stud bolts 63 sandwiching the vertical ribs 7 therebetween.
7 are provided with the vertical rib 7 interposed therebetween. By doing so, the mounting of the reinforcement fitting 61 can be performed in a more stable state.

Note that, as shown in FIG.
When a plurality of steel segments 3 are provided in the circumferential direction of the steel segment piece 1, the distance between the tips of the stud bolts 63 is small and the state is closed. The tip of 63 is closed and it is difficult to pass through the skin bolt hole 47.

For this reason, the reinforcing bracket 61 of the type shown in FIG.
This is effective for a steel segment piece 1 having a large curvature. However, if there is room for play of the skin bolt hole 47 and the closed end of the stud bolt 63 can be used, it can be used.

Such a connecting portion reinforcing structure (FIGS. 1 to 8) does not necessarily need to be provided at the connecting portion of all the steel segment pieces 1 constituting one hollow cylindrical body 15, and is particularly required in the event of an earthquake or the like. It is also possible to partially provide only a portion where a large moment may be applied.

[0059]

As described above, according to the steel segment connecting portion reinforcing structure according to any one of the first to sixth inventions, the steel segment pieces are joined together in a connected state. Since the force for opening the mating surfaces of the main girders or the joint plates is received by the reinforcing metal, the connection strength can be increased without increasing the number of bolts as in the related art.

According to the second aspect of the present invention, the main girder or joint plate in the fitted state can be strongly prevented from being opened by fitting into the groove of the reinforcing bracket, A large connection strength can be obtained with a simple structure.

According to the third invention, the main girder or the joint plate does not need to have a structure protruding outside the skin plate as in the second invention. As for the plate, a reinforcing metal fitting can be used only by forming a through hole or a notch in the skin plate with respect to a steel segment piece having a structure connected to the inside of the skin plate.

That is, the structure of the conventional steel segment piece is greatly changed by fitting the tongues of the reinforcing fittings penetrating the through holes or notches to the fitted main girders or joint plates. Without increasing the connection strength.

According to the fourth aspect of the present invention, the force for opening the mating surfaces of the joined main girders or joint plates is received as a pulling force by the reinforcing metal fitting and the auxiliary metal fitting via the stud bolt. Can be It is only necessary to form the bolt holes in the skin plate of the steel segment piece having the conventional structure, and it is not necessary to add a large processing to the structure of the steel segment piece.

According to the fifth aspect of the present invention, the reinforcing structure in which the auxiliary fitting is omitted from the fourth aspect of the invention is further provided, and the number of parts can be reduced. Further, according to the sixth invention, it is possible to mount the reinforcing metal fitting in a stable state.

[Brief description of the drawings]

FIG. 1A is a perspective view of a hollow cylindrical body constituted by steel segments according to an embodiment of the present invention. FIG. 1B is an enlarged view of a portion B of FIG. 1A, and FIG. It is a figure which shows the modification of B).

FIG. 2A is a perspective view showing a reinforcing structure of a connecting portion where steel segment pieces constituting the hollow cylindrical body of FIG. 1 are connected to each other. FIG. 2B is used for the reinforcing structure of FIG. It is a perspective view which shows a reinforcement fitting.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2 (A).

FIG. 4 is an enlarged sectional perspective view of a main part in another embodiment.

FIG. 5 is an enlarged perspective view of a main part of another embodiment.

6A is a partial cross-sectional view of the embodiment of FIG. 5, and FIG. 6B is an exploded perspective view showing a reinforcing bracket used in FIG.

FIG. 7A is an enlarged perspective view of a main part in still another embodiment, and FIG. 7B is a plan view seen from a direction B in FIG.

FIG. 8A is an enlarged perspective view of a main part of still another embodiment, and FIG. 8B is a plan view seen from the B direction of FIG.

9 (A) is a perspective view of a conventional steel segment piece, and FIG. 9 (B) is a view showing the problem of FIG. 9 (A).

FIG. 10 is a perspective view of a steel segment piece according to another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel segment piece 3 Main girder 5 Joint plate 7 Vertical rib 9 Skin plate 15 Hollow cylindrical body 21, 23, 45, 61 Reinforcement fitting 25 Groove 27 Bolt hole 30, 38, 55
Nut 33 Skin bolt hole 41 Through hole 43 Tongue 49, 63 Stud bolt 51 Auxiliary fitting 59 Rib bolt hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shogo Nagaoka 6100 Sankejiri, Kumagaya-shi, Saitama Japan Inside Kokan Light Steel Co., Ltd. (72) Inventor Yoshiyuki Hamada Kanie-cho, Kaiie-gun, Aichi Prefecture No. 9 in Kato Construction Co., Ltd. (72) Inventor Tomoya Takeda Aichi Pref., Kanie-cho, Kaifu-gun, Aichi Prefecture

Claims (6)

[Claims] 1. A plurality of steel segment pieces are connected to each other to form a hollow cylinder, and each steel segment piece divides the hollow cylinder into a plurality of rings in an axial direction of the cylinder, and The main girder has a shape in which the ring is divided in the circumferential direction, and a pair of main girders which are long in the circumferential direction of the hollow cylindrical body and are arranged substantially in parallel, and a pair of left and right connecting both ends of both main girders are arranged substantially in parallel. Composed of a joint plate, a plurality of substantially parallel vertical ribs connected to an intermediate portion between the two main girders, and a skin plate stretched over the main girder, the joint plate, and the vertical ribs. A connection part reinforcement structure of a segment made of metal, and a reinforcing bracket for preventing a mating surface between main girders or joint plates joined together in the connected state from being opened, along the main girder or joint plate. Connection segment reinforcement of steel segment characterized by being provided Elephants. 2. The main girder or the joint plate protrudes outside the skin plate, and the reinforcing metal fitting includes a groove for fitting the protruding portions fitted together, and a bolt attached to the skin plate in the fitted state. 2. The structure for reinforcing a steel segment connecting part according to claim 1, further comprising a bolt hole for stopping, and a skin bolt hole communicating with the bolt hole is formed in the skin plate. 3. The skin plate has a through hole or notch formed in the skin plate at a position just inside the main girder or the joint plate. A pair of tongues that penetrate through the through holes or notches that are to be positioned as a pair and fit into the fitted main girder or joint plate, and bolted to the skin plate in this fitted state 2. The steel segment connecting part reinforcing structure according to claim 1, further comprising: a bolt hole for the steel segment, the skin plate having a skin bolt hole communicating with the bolt hole. 4. A bolt hole is formed in the skin plate at a position immediately inside the main girder or the joint plate, and the reinforcing metal fittings are positioned in pairs with the fitted main girder or the joint plate interposed therebetween. A pair of stud bolts penetrating the bolt hole, an auxiliary fitting penetrating the pair of stud bolts, and being fastened to the tip of the stud bolt, the fitted main girder or the inner end face of the joint plate is fitted with the stud bolt. 2. The joint reinforcing structure for steel segments according to claim 1, further comprising: a nut for pressing the auxiliary fitting to fix the reinforcing fitting. 5. A skin bolt hole is formed in the skin plate at a position immediately inside the main girder or the joint plate, and the vertical rib has a substantially L-shaped cross-sectional shape with an inner end bent. A rib bolt hole is formed in the bent portion at a position facing the bolt hole, and the reinforcing bracket penetrates through the bolt hole and the rib bolt hole which are positioned in pairs with the fitted main girder or joint plate interposed therebetween. The joint reinforcement structure for steel segments according to claim 1, comprising: a pair of stud bolts; and a nut fixed to the tip of the stud bolt to fix the reinforcing bracket. 6. The stud bolt is provided with two pairs,
The connecting portion reinforcing structure for steel segments according to claim 4, wherein each pair of stud bolts is provided with the vertical rib interposed therebetween.