JP6901986B2 - Stopper and stopper mounting structure - Google Patents

Description

The present disclosure relates to a stopper and a stopper mounting structure.

Conventionally, reinforced concrete structures have been widely used as structures such as viaducts for railways and roads. In such structures, steel rod stoppers, steel angle stoppers or damper type stoppers are used to connect the rigid frame viaduct or pier which is the substructure and the bridge girder which is the superstructure. The functions required of the stopper are to limit the movement of the girder against the horizontal force caused by an earthquake or the like, and to prevent the bridge collapse of the bridge girder. As the steel rod stopper, a steel rod stopper made of a round steel rod is used with a girder having a girder length of about 15 [m] or less (see, for example, Patent Document 1).

FIG. 1 is a perspective view showing an example in which a conventional steel rod stopper is applied to a connecting portion between a substructure and a superstructure, and FIG. 2 is a cross section of a connecting portion between the substructure and the superstructure to which the conventional steel rod stopper is applied. It is a figure. In FIG. 2, (a) is a vertical cross-sectional view of the entire connecting portion, and (b) is a cross-sectional view of the steel rod stopper.

In FIG. 1, reference numeral 21 denotes a viaduct girder used for a railway, which is a reinforced concrete structure or a prestressed concrete structure, on which a railway track, that is, a track 25 is laid. Reference numeral 11 denotes a pier of the viaduct, which has a reinforced concrete structure, supports the girder 21, and transmits a vertical load to the foundation or the ground. Specifically, the shoe seat 13 and the bearing body 14 are installed on the girder seat 12 above the pier 11, and the girder 21 is placed on the girder seat 12. In FIG. 1, for convenience of explanation, the figure of the digit continuous with the digit 21 is omitted.

Further, in order to limit the horizontal movement of the girder 21 caused by the horizontal force due to an earthquake or the like, a steel rod stopper made of a round steel rod 37 having a uniform diameter is embedded in the girder seat 12 and the girder end 22 as a stopper 31. ing. Specifically, as shown in FIG. 2, the lower end of the stopper 31 and the lower embedding portion 32B in the vicinity thereof are embedded in the girder seat 12, and the upper end of the stopper 31 and the upper embedding in the vicinity thereof are embedded. The portion 32A is housed and embedded in a sheath pipe 23 made of a steel pipe inserted into the girder end 22 so as to open to the lower surface 22a of the girder end. Further, the girder seat 12 and the girder end 22 are provided so as to surround the lower embedded portion 32B of the stopper 31 embedded in the girder seat 12 and the circumference of the sheath pipe 23 inserted into the girder end 22. , Spiral reinforcing bar 26 is embedded. When the upper embedded portion 32A and the lower embedded portion 32B are described in an integrated manner, they will be described as the embedded portion 32.

A gap portion is provided between the girder seat upper surface 12a and the girder end lower surface 22a. As shown in FIG. 1, a plurality of stoppers 31 (three in the example shown in FIG. 1) are installed so as to be arranged in the width direction of the girder 21.

Since the upper and lower sides of the stopper 31 are embedded in the girder seat 12 and the girder end 22, the horizontal movement of the bridge girder 21 with respect to the pier 11 is appropriately restricted. When the inertial force G acts on the bridge girder 21 as in the case of an earthquake, the stopper 31 receives the inertial force G as shown in FIG.

Japanese Unexamined Patent Publication No. 2010-242443

However, in the above-mentioned conventional technique, when a large inertial force G is received as in the case of an earthquake, the girder seat 12 as a substructure in which the lower embedded portion 32B of the stopper 31 is embedded and the upper embedded portion of the stopper 31 are embedded. The girder end 22 as a superstructure in which the recess 32A is embedded may be damaged.

FIG. 3 is a photograph showing the damage to the superstructure in which the conventional steel rod stopper is embedded due to the earthquake, and FIG. 4 is a photograph showing the damage to the substructure in which the conventional steel rod stopper is embedded due to the earthquake. is there.

Damage to superstructures and substructures in railways and road viaducts, which are transportation networks, interrupts medical care, relief supplies, dispatch of rescue units, etc., and threatens human life, so it is necessary to recover immediately. However, as shown in FIGS. 3 and 4, when the girder end 22 or the girder seat 12 is damaged, inspection using an aerial work platform is required, and time and labor are required for restoration. Further, the damage occurs not only on the front surface 12b side of the girder seat 12, but also on the back surface 12c side (girder space) of the girder seat 12 as shown in FIG. 4, but the back surface 12c is an invisible part. Moreover, since the work space for performing the restoration work is narrow, not only the restoration takes a long time, but also the restoration work itself may become difficult.

Here, by solving the problems of the conventional technique and making at least a part of the embedded portion of the stopper into a filled steel pipe containing a round steel rod, damage is concentrated on the gap portion of the stopper, and the stopper is stopped. It is an object of the present invention to provide a stopper and a stopper mounting structure capable of suppressing damage to the concrete of the structure in which the embedded portion is embedded, and easily and quickly performing the restoration work of the structure. And.

Therefore, the stopper is a stopper having a round steel rod in which at least the lower end is embedded in the concrete of the substructure and at least the upper end is embedded in the concrete of the superstructure placed on the substructure. It is provided with a play space made of the round steel rod exposed in the gap between the substructure and the superstructure, and an embedded portion embedded in the concrete of the substructure and the superstructure, and at least one of the embedded portions. Ri filled tubular der which parts are built the round steel bar, is the Joint Gap portion does not exist the filling steel tube.

In another stopper, the filled steel pipe further has a steel pipe surrounding the round steel rod and a filler filled between the round steel rod and the steel pipe.

In still other stoppers, the filler is further concrete or mortar.

In the other stopper, the filled steel pipe is further located in the vicinity of the gap, which is a portion in the vicinity of the gap in the embedded portion.

In still other stoppers, the cross-sectional rigidity of at least a part of the embedded portion is larger than the cross-sectional rigidity of the gap portion.

In the stopper mounting structure, at least the lower end is embedded in the substructure, the superstructure mounted on the substructure , and the concrete of the substructure, and at least the upper end is embedded in the concrete of the superstructure. A stopper having a round steel rod is provided, and the stopper is embedded in a play space made of the round steel rod exposed in a gap between the substructure and the superstructure and concrete of the substructure and the superstructure. and a buried portion, Ri filled tubular der at least a portion of the該埋write unit incorporating the round steel bar, is the Joint Gap portion does not exist the filling steel tube.

According to the present disclosure, at least a part of the embedded portion of the stopper is a filled steel pipe containing a round steel rod. As a result, the damage can be concentrated on the loose portion of the stopper, and the damage to the concrete of the structure in which the stopper embedded portion is embedded can be suppressed, and the restoration work of the structure can be easily and quickly performed. be able to.

It is a perspective view which shows the example which applied the conventional steel bar stopper to the connecting part between a substructure and a superstructure. It is sectional drawing of the connection part of the substructure and superstructure to which the conventional steel rod stopper is applied. It is a photograph showing the damage caused by the earthquake to the superstructure in which the conventional steel rod stopper is embedded. It is a photograph showing the damage caused by the earthquake to the substructure in which the conventional steel rod stopper is embedded. It is a figure which shows the relationship between the horizontal load and the horizontal displacement obtained by the loading test of the structure in 1st Embodiment. It is a photograph which shows the damage received by the loading test of the structure in 1st Embodiment. It is a figure which shows the distribution of the bearing pressure stress obtained by the reproduction analysis of the structure in 1st Embodiment. It is a figure which shows the stopper in 1st Embodiment. It is a figure which shows the stopper in 2nd Embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 5 is a diagram showing the relationship between the horizontal load and the horizontal displacement obtained by the load test of the structure in the first embodiment, and FIG. 6 is a diagram showing the damage received by the load test of the structure in the first embodiment. FIG. 7 is a diagram showing the distribution of bearing stress obtained by the reproduction analysis of the structure in the first embodiment. In FIG. 6, (a) is a photograph showing the damage received by the first loading test, and (b) is a photograph showing the damage received by the second loading test.

In the present embodiment, the explanations in the sections of "Background Technology" and "Problems to be Solved by the Invention" are used to refer to the structure, operation and effect of each part in the connecting portion between the substructure and the superstructure. With respect to the same as those described in the sections of "Background Art" and "Problems to be Solved by the Invention", the same reference numerals as those shown in FIGS. 1 and 2 will be assigned, and the description thereof will be omitted as appropriate.

Further, in the present embodiment, the directions of upper, lower, left, right, front, rear, etc., which are used to explain the configuration and operation of each part of the connecting portion between the substructure and the superstructure and other members, are used. The expressions shown are relative rather than absolute, and are appropriate when each part of the connection between the substructure and the superstructure and other members are in the posture shown in the figure, but the posture is If it changes, it should be changed and interpreted according to the change in posture.

As explained in the section "Problems to be solved by the invention", when structures such as superstructures and substructures in railway viaducts are damaged, the damaged parts are the girder end 22 and the girder seat 12. If so, not only will it take a long time to recover, but the recovery work itself may become difficult. Therefore, a loading test is conducted to clarify what kind of damage the structure will be damaged in the event of a disaster. By such a loading test, the relationship between the residual yield strength and damage of the steel rod stopper as the stopper 31 and the concrete of the girder seat 12 which is the substructure in which the lower embedded portion 32B of the stopper 31 is embedded is clarified. It is becoming.

FIG. 5 shows a curve showing the relationship between the horizontal load and the horizontal displacement obtained as a result of the first and second (No. 1 and No. 2) loading tests. It is also shown that the steel rod stopper as the stopper 31 yielded and that the concrete of the girder seat 12 as shown in FIG. 6 was peeled off.

Further, by performing an analysis based on the result of the loading test as shown in FIG. 5, as shown in FIG. 7, the concrete of the girder seat 12 in which the lower embedded portion 32B of the stopper 31 is embedded is The distribution of bearing pressure can be reproduced. From the results shown in FIG. 7, it can be seen that the bearing pressure is concentrated in the vicinity of the girder upper surface 12a.

The concrete around the embedded portion 32 of the stopper 31 is difficult to suppress damage by the current design method and structural details. Therefore, here, the damage of the concrete around the embedded portion 32 is controlled by changing the specification of the stopper 31 from the damage mechanism.

FIG. 8 is a diagram showing a stopper according to the first embodiment. In the figure, (a) is a side view, and (b) is a cross-sectional view taken along the line AA in (a).

As shown in the figure, the stopper 31 in the present embodiment has a round steel rod 37, but has an upper embedded portion 32A embedded in the girder end 22 as a superstructure and an upper embedded portion 32A as a substructure. The lower embedded portion 32B embedded in the girder seat 12 is a concrete-filled steel pipe 38 as a filled steel pipe containing a round steel rod 37. The outer diameters of the upper embedded portion 32A and the lower embedded portion 32B are set to be larger than the outer diameter of the clearance portion 33 exposed in the gap 24 between the girder seat upper surface 12a and the girder end lower surface 22a. The upper embedded portion 32A and the lower embedded portion 32B are set to have the same diameter. That is, the embedded portion 32, which is the concrete-filled steel pipe 38, is set to have a larger diameter than the clearance portion 33 made of the round steel rod 37. Specifically, as shown in FIG. 8B, in the stopper 31 in the present embodiment, the embedded portion 32 has been described in the sections of "background technology" and "problems to be solved by the invention". The embedded portion 32 is composed of a round steel rod 37 similar to the stopper 31, and the embedded portion 32 covers the outer periphery of the round steel rod 37, that is, surrounds the steel pipe 35, and the filler 36 between the round steel rod 37 and the steel pipe 35. It is a concrete-filled steel pipe 38 filled with concrete. The filler 36 is not limited to concrete, and may be a mortar containing no coarse aggregate.

In the example shown in FIG. 8, the diameter of the large-diameter embedded portion 32 made of the concrete-filled steel pipe 38 is about 150 [mm], and the diameter of the small-diameter free space 33 made of the round steel rod 37 is about 100 [mm]. ], The length of the embedded portion 32 is about 600 [mm], and the length of the small diameter clearance portion 33 is about 100 [mm], but the diameter and length of each portion should be changed as appropriate. Can be done. It is desirable that the embedded portion 32 is set so that its cross-sectional rigidity is larger than the cross-sectional rigidity of the clearance portion 33.

As shown in FIG. 8, the embedded portion 32 embedded in the girder end 22 and the girder seat 12 is made of a concrete-filled steel pipe 38 containing a round steel rod 37 to increase the cross-sectional rigidity of the embedded portion 32. When a large inertial force G is applied as in an earthquake, the damage is concentrated on the loose portion 33 made of the round steel rod 37, and the concrete around the embedded portion 32 in the girder end 22 and the girder seat 12 is damaged. It can be suppressed. Further, since the concrete around the embedded portion 32 is reinforced by the concrete-filled steel pipe 38, damage to the concrete is further suppressed. Further, the concrete-filled steel pipe 38 can be replaced with the spiral reinforcing bar 26. Further, the steel pipe 35 of the embedded portion 32 can be constructed in the same manner as the spiral reinforcing bar 26.

As described above, in the present embodiment, at least the lower end of the stopper 31 is embedded in the girder seat 12 as the substructure, and at least the upper end is embedded in the girder end 22 as the superstructure mounted on the girder seat 12. It has a round steel rod 37 to be embedded. The stopper 31 includes a gap portion 33 exposed in the gap 24 between the girder seat 12 and the girder end 22, and an embedded portion 32 embedded in the girder seat 12 and the girder end 22, and the embedded portion 32. At least a part is a concrete-filled steel pipe 38 containing a round steel rod 37.

Further, in the steel rod stopper mounting structure of the present embodiment, at least the lower end is embedded in the girder seat 12 as the substructure, the girder end 22 as the superstructure mounted on the girder seat 12, and the girder seat 12. A stopper 31 having a round steel rod 37 embedded in the girder end 22 and having at least the upper end embedded therein is provided, and the stopper 31 has a clearance portion 33 exposed to a gap 24 between the girder seat 12 and the girder end 22. , A concrete-filled steel pipe 38 in which at least a part of the embedded portion 32 includes a round steel rod 37, including an embedded portion 32 embedded in the girder seat 12 and the girder end 22.

As a result, the damage can be concentrated on the loose portion 33 of the stopper 31, and the damage to the concrete of the structure in which the embedded portion 32 of the stopper 31 is embedded can be suppressed, and the restoration work of the structure can be easily performed. , Can be done quickly. Further, the girder end 22 and the girder seat 12 of the stopper 31 can be easily attached.

Further, the concrete-filled steel pipe 38 has a steel pipe 35 surrounding the round steel rod 37 and a filler 36 filled between the round steel rod 37 and the steel pipe 35. Further, the filler 36 is concrete or mortar. Further, the cross-sectional rigidity of at least a part of the embedded portion 32 is larger than the cross-sectional rigidity of the clearance portion 33. By reducing the cross-sectional rigidity of the play space 33 in this way, damage to the concrete of the structure can be efficiently suppressed.

Next, the second embodiment will be described. For those having the same structure as that of the first embodiment, the description thereof will be omitted by assigning the same reference numerals. Further, the description of the same operation and the same effect as that of the first embodiment will be omitted.

FIG. 9 is a diagram showing a stopper in the second embodiment. In the figure, (a) is a side view, and (b) is a cross-sectional view taken along the line BB in (a).

As can be seen from the results shown in FIG. 7, when a large inertial force G is applied, the bearing pressure of the concrete is concentrated in the portion close to the void 24. Therefore, as shown in FIG. 9, the stopper 31 in the present embodiment has a concrete-filled steel pipe 38 only in the vicinity of the gap portion 33 in the embedded portion 32, and has a large cross-sectional rigidity.

More specifically, the clearance vicinity portion 32Aa in the upper embedded portion 32A and the clearance vicinity portion 32Ba in the lower embedded portion 32B are concrete-filled steel pipes 38 incorporating the round steel rod 37, and the distant portion in the upper embedded portion 32A. The distant portion 32Bb in the 32Ab and the lower embedded portion 32B is made of a round steel rod 37, similarly to the clearance portion 33. When the gap near portion 32Aa in the upper embedded portion 32A and the gap near portion 32Ba in the lower embedded portion 32B are described in an integrated manner, they are described as the gap near portion 32a, and the distant portion 32Ab and the far portion 32Ab in the upper embedded portion 32A. When the distant portion 32Bb in the lower embedded portion 32B is described in an integrated manner, it will be described as the distant portion 32b. In the example shown in FIG. 9, the diameter of the large-diameter gap portion 32a made of the concrete-filled steel pipe 38 is about 150 [mm], and the diameter of the small-diameter gap portion 33 made of the round steel rod 37 is about 100 [mm]. ], The length of the embedded portion 32 is about 600 [mm], the length of the small-diameter clearance portion 33 is about 100 [mm], and the length of the gap vicinity portion 32a is about 300 [mm]. However, the diameter and length of each part can be changed as appropriate.

As described above, in the present embodiment, the gap vicinity portion 32a, which is a portion near the clearance portion 33 in the embedded portion 32, is the concrete-filled steel pipe 38 containing the round steel rod 37.

As a result, the cross-sectional rigidity of the portion where the bearing pressure of the concrete of the structure is concentrated can be increased, and the damage of the concrete of the structure can be efficiently suppressed.

Since the effects of other points are the same as those of the first embodiment, the description thereof will be omitted.

The disclosure herein also describes features relating to preferred and exemplary embodiments. Various other embodiments, modifications and modifications within the scope and purpose of the claims attached herein can be naturally conceived by those skilled in the art by reviewing the disclosure of the present specification. is there.

The present disclosure can be applied to stoppers and stopper mounting structures.

12 Girder seat 22 Girder end 24 Void 31 Stopper 32A Upper embedded part 32Aa, 32Ba Free space near part 32B Lower embedded part 33 Free space 35 Steel pipe 36 Filler 37 Round steel bar 38 Concrete filled steel pipe

Claims (6)

A stopper having a round steel rod in which at least the lower end is embedded in the concrete of the substructure and at least the upper end is embedded in the concrete of the superstructure placed on the substructure.
A free space portion made of the round steel rod exposed in the gap between the substructure and the superstructure, and
The substructure and the embedding portion embedded in the concrete of the superstructure are provided.
At least a portion of該埋write portion Ri filled steel tube der which incorporates the round steel bar, stopper the said Joint Gap portion and wherein the absence of the filling steel tube. The stopper according to claim 1, wherein the filled steel pipe has a steel pipe surrounding the round steel rod and a filler filled between the round steel rod and the steel pipe. The stopper according to claim 2, wherein the filler is concrete or mortar. The stopper according to any one of claims 1 to 3, wherein the gap portion near the gap portion in the embedded portion is the filled steel pipe. The stopper according to claim 1, wherein the cross-sectional rigidity of at least a part of the embedded portion is larger than the cross-sectional rigidity of the gap portion. Substructure and
The superstructure placed on the substructure and
A stopper having a round steel rod having at least the lower end embedded in the concrete of the substructure and at least the upper end embedded in the concrete of the superstructure is provided.
The stopper includes a gap portion made of the round steel rod exposed in the gap between the substructure and the superstructure, and an embedding portion embedded in the concrete of the substructure and the superstructure. stopper mounting structure in which at least a portion of the part is Ri filled steel tube der which incorporates the round steel bar, is the Joint Gap portion and wherein the absence of the filling steel tube.

Images