JP6901981B2 - Replacement steel rod stopper mounting structure and method - Google Patents

Description

The present disclosure relates to a replacement steel rod stopper mounting structure and method.

Conventionally, reinforced concrete structures made of reinforced concrete have been widely used as railway structures such as viaducts. In such railway structures, stoppers are used to connect the rigid frame viaduct or pier, which is a substructure, to the bridge girder, which is a superstructure placed on the substructure. The functions required of the stopper are to limit the movement of the bridge girder caused by the vibration at the time of an earthquake and the lateral pressure of the train, to prevent the bridge collapse of the bridge girder, and the like. As the stopper, a steel rod stopper made of a round steel rod has been conventionally used (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 substructure and a superstructure showing a state in which a conventional steel rod stopper is plastically deformed. It is sectional drawing of the connecting part of.

In the figure, reference numeral 21 denotes a viaduct girder, which is made of reinforced concrete, and a railroad track, that is, a track 25 is laid on the upper surface thereof. Reference numeral 11 denotes a viaduct pier, which is made of reinforced concrete and supports the bridge girder 21. Specifically, the girder end 22 of the bridge girder 21 is placed on the girder seat upper surface 12a of the girder seat 12 formed at the upper end of the pier 11. Further, as shown in FIG. 1, between the girder seat upper surface 12a and the girder end lower surface 22a, a girder seat 13 formed on the girder seat upper surface 12a and a rubber shoe 14 placed on the girder seat 13 are placed. It is desirable to intervene. In FIG. 1, for convenience of explanation, a part of the girder end 22 of the bridge girder 21 is not shown.

Further, a steel rod stopper 31 made of a round steel rod is embedded in the girder seat 12 and the girder end 22 in order to limit the horizontal movement of the bridge girder 21 caused by the vibration at the time of an earthquake or the lateral pressure of the train. Specifically, as shown in FIG. 2, the lower end of the steel rod stopper 31 and its vicinity are hollow portions extending in the vertical direction formed in the girder seat 12 so as to open to the upper surface 12a of the girder seat. Upper accommodation, which is a cavity that is accommodated and embedded in the accommodating cavity 15 and extends in the vertical direction formed at the girder end 22 so that the upper end and the vicinity thereof of the steel rod stopper 31 open to the lower surface 22a of the girder end. It is housed and embedded in the cavity 23. A gap 24 exists between the girder seat upper surface 12a and the girder end lower surface 22a, and the portion 32 of the steel rod stopper 31 is exposed to the gap 24. As shown in FIG. 1, it is desirable that a plurality of the steel rod stoppers 31 (three in the example shown in FIG. 1) be arranged so as to be arranged in the width direction of the bridge girder 21.

Since the upper and lower sides of the steel rod 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. The strength of the steel rod stopper 31 is set to such that when a large force G acts on the bridge girder 21 as in an earthquake, the portion 32 of the steel rod stopper 31 is plastically deformed as shown in FIG. Has been done. As a result, a large force G can be absorbed by the plastic deformation of the steel rod stopper 31 to prevent damage or breakage of the girder seat 12 or the girder end 22 in which the steel rod stopper 31 is embedded.

Japanese Unexamined Patent Publication No. 2010-242443

However, with the above-mentioned conventional technique, it is difficult to replace the plastically deformed steel rod stopper 31. If the plastically deformed steel rod stopper 31 is left, the horizontal displacement of the bridge girder 21 with respect to the pier 11 is fixed as it is. Next, when a large force G such as during an earthquake acts on the bridge girder 21, the plastically deformed portion 32 is easily broken, so that the steel rod stopper 31 can fulfill its original function. Can not. However, when a force G so large as to plastically deform the portion 32 acts on the bridge girder 21, the steel rod stopper 31 often interferes with the lower accommodating cavity 15 or the upper accommodating cavity 23, and the steel rod stopper 31 is removed. It is difficult to replace the steel rod stopper 31, which requires a long time and a great deal of labor.

Here, by solving the problems of the conventional technique, in addition to the installed steel rod stopper, as a replacement steel rod stopper, at least the lower end and the upper end of the lower steel rod and the upper steel rod separated from each other are used. When the installed steel rod stopper is plastically deformed, the plastically deformed part of the steel rod stopper is cut and removed, and the lower steel rod and the upper steel rod are removed. It is an object of the present invention to provide a replacement steel rod stopper mounting structure and method capable of easily and quickly replacing the steel rod stopper by joining the steel rod stoppers via a relay member.

Therefore, in the replacement steel rod stopper mounting structure, the lower accommodating cavity formed in the substructure, the upper accommodating cavity formed in the superstructure mounted on the substructure, and at least the lower end is the lower portion. A steel rod stopper housed in the containment cavity, at least the upper end housed in the upper containment cavity, a lower steel rod at least the lower end housed in the lower containment cavity, and at least the upper end in the upper containment cavity. and a upper steel rod housed in said the lower steel bar and the upper steel rod Ri bondable der via the relay member, the lower end face of the upper steel rod and the upper end surface of the lower steel rods and between, it exists is insertable gap the relay member.

In other replacement steel rod stopper mounting structures, the lower accommodating cavity formed in the substructure, the upper accommodating cavity formed in the superstructure mounted on the substructure, and at least the lower end are the lower accommodating cavity. A steel rod stopper housed in the cavity, at least the upper end housed in the upper house cavities, a lower steel bar at least the lower end housed in the lower house cavities, and at least the upper end in the upper house cavities. It is provided with a housed upper steel rod, and the lower steel rod and the upper steel rod can be joined via a relay member, and the exposed portion of the steel rod stopper between the substructure and the superstructure is , Ru cutting removable der.

In still another replacement steel rod stopper mounting structure, the lower steel rod and the upper steel rod are further arranged side by side with the steel rod stopper.

In still another replacement steel bar stopper mounting structure, the steel bar stopper is further made of a round steel bar, and the lower steel bar and the upper steel bar are made of a round steel bar having the same diameter as the steel bar stopper.

In yet another replacement steel rod stopper mounting structure, the substructure is a rigid frame viaduct or pier, and the superstructure is a bridge girder.

In the replacement steel rod stopper mounting method, at least the lower end of the steel rod stopper is housed in the lower accommodating cavity formed in the substructure, and at least the upper end of the steel rod stopper is placed on the substructure. The lower end of the lower steel rod is accommodated in the lower accommodating cavity, and at least the upper end of the upper steel rod is accommodated in the upper accommodating cavity. The relay member is provided between the upper end surface of the lower steel rod and the lower end surface of the upper steel rod, including enabling the side steel rod and the upper steel rod to be joined via a relay member. There is an insertable gap .

In another method of mounting the steel rod stopper, at least the lower end of the steel rod stopper is housed in the lower accommodating cavity formed in the substructure, and at least the upper end of the steel rod stopper is placed on the substructure. Accommodating in the upper accommodating cavity formed in the superstructure, accommodating at least the lower end of the lower steel rod in the lower accommodating cavity, and accommodating at least the upper end of the upper steel rod in the upper accommodating cavity. see containing and a allowing joining the lower steel bar and the upper steel rod through said relay board, exposed portion between the lower Engineering and superstructure in the steel bar stopper, cleavable removed Is .

According to the present disclosure, in addition to the installed steel rod stopper, as a replacement steel rod stopper, at least the lower end and the upper end of the lower steel rod and the upper steel rod separated from each other are contained in the lower accommodating cavity and the upper accommodating cavity. Store in. As a result, when the installed steel rod stopper is plastically deformed, the plastically deformed portion of the steel rod stopper is cut and removed, and the lower steel rod and the upper steel rod are joined via a relay member. Therefore, the steel rod stopper can be easily and quickly replaced.

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 the superstructure which shows the state which plastic deformation occurred in the conventional steel rod stopper. It is sectional drawing of the connection part of the substructure and the superstructure to which the replacement steel rod stopper is applied in this embodiment. It is a top view of the substructure which shows the arrangement of the replacement steel rod stopper in this embodiment. It is sectional drawing of the connection part of the substructure and superstructure connecting the replacement steel rod stopper in this embodiment.

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

FIG. 3 is a cross-sectional view of a connecting portion between the substructure and the superstructure to which the replacement steel rod stopper is applied in the present embodiment, and FIG. 4 is an upper surface of the substructure showing the arrangement of the replacement steel rod stopper in the present embodiment. FIG. 5 is a cross-sectional view of a connecting portion between the substructure and the superstructure connecting the replacement steel rod stopper in the present embodiment.

In the figure, reference numeral 21 denotes a viaduct girder as a superstructure in the present embodiment, which is made of reinforced concrete, but may be for railways, roads, or the like. It may be used for any purpose, but here, for convenience of explanation, it is described as being for a railway and having a track laid on the upper surface thereof. Reference numeral 12 denotes a girder seat of the bridge pier as a substructure in the present embodiment, and the girder end 22 of the bridge girder 21 is placed on the girder seat upper surface 12a.

In the present embodiment, the explanations in the sections of "background technology" and "problems to be solved by the invention" are used to describe the structure, operation, and effect of each part in the connecting portion between the substructure and the superstructure. Therefore, the same reference numerals as those described in the sections of "Background Technology" and "Problems to be Solved by the Invention" are appropriately omitted by assigning the same reference numerals as those shown in FIGS. 1 and 2. To do.

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 shown in FIG. 3, in the present embodiment, at least the lower end and the upper end of the lower steel rod 31a and the upper steel rod 31b separated from each other are formed on the girder seat 12 as replacement steel rod stoppers, respectively. It is accommodated and embedded in the lower accommodating cavity 15 which is a cavity extending in the vertical direction and in the upper accommodating cavity 23 which is a cavity extending in the vertical direction formed at the girder end 22. The inner peripheral surfaces of the lower accommodating cavity 15 and the upper accommodating cavity 23 do not necessarily have to be in close contact with the outer peripheral surfaces of the lower steel rod 31a and the upper steel rod 31b, and the lower accommodating cavity 15 and the upper accommodating cavity 23 are not necessarily in close contact with each other. There may be a gap between the inner peripheral surface of the 23 and the outer peripheral surface of the lower steel rod 31a and the upper steel rod 31b. That is, the lower steel rod 31a and the upper steel rod 31b may be fitted to the lower accommodating cavity 15 and the upper accommodating cavity 23 with a horizontal tolerance. The upper end surface of the lower steel rod 31a and the lower end surface of the upper steel rod 31b are separated from each other, and a gap 33 exists between them.

The size of the gap 33 can be arbitrarily set, but it is desirable that the gap 33 is set to a degree slightly smaller than the gap 24 between the upper surface of the girder seat 12a and the lower surface of the girder end 22a. That is, the position of the upper end surface of the lower steel rod 31a and the position of the lower end surface of the upper steel rod 31b in the vertical direction can be arbitrarily set, but the upper end surface of the lower steel rod 31a is the upper surface of the girder seat 12a. It is desirable that the lower end surface of the upper steel rod 31b is located slightly above the lower surface of the girder end 22a.

Then, as shown in FIG. 4, in the present embodiment, the replacement steel rod stopper includes the substructure and the superstructure in addition to the steel rod stopper 31 as the installed steel rod stopper installed from the beginning. It is installed at the connecting part of. Note that FIG. 4 is a diagram for showing the positional relationship between the steel rod stopper 31 as the installed steel rod stopper and the replacement steel rod stopper in the horizontal direction, and the steel rod stopper 31 on the girder upper surface 12a. The arrangement with the lower steel rod 31a is shown.

The steel rod stopper 31 shown in FIG. 4 is similar to the steel rod stopper 31 described in the sections of "Background Technology" and "Problems to be Solved by the Invention", and each of them is a single round steel. It is housed and embedded in a lower housing cavity 15 which is composed of rods and is formed in the girder seat 12 so that at least the lower end opens to the upper surface 12a of the girder seat and extends in the vertical direction, and at least the upper end is the girder end. It is housed and embedded in the upper housing cavity 23, which is a cavity extending in the vertical direction formed at the girder end 22 so as to open to the lower surface 22a.

Further, in the present embodiment, the lower steel rod 31a and the upper steel rod 31b as the replacement steel rod stopper are round steel rods having the same diameter made of the same material as the steel rod stopper 31, but the materials thereof. Alternatively, the diameter can be changed as appropriate.

In the example shown in FIG. 4, three steel rod stoppers 31 are arranged so as to be arranged in the width direction of the bridge girder 21, but the number and arrangement of the steel rod stoppers 31 can be appropriately changed. Further, the replacement steel rod stoppers indicated by the lower steel rod 31a are arranged side by side with the steel rod stopper 31, more specifically, a total of two stoppers are arranged between the steel rod stoppers 31. The number and arrangement can be changed as appropriate.

Then, when a large force G acts on the bridge girder 21 as in the case of an earthquake, as shown in FIG. 2, the exposed portion 32 between the girder seat 12 and the girder end 22 in the steel rod stopper 31 is plastically deformed. In this case, if the steel rod stopper 31 in which the portion 32 is plastically deformed is left as it is, the problem as described in the section "Problems to be Solved by the Invention" occurs. Therefore, in the present embodiment, the plastically deformed portion 32 is cut and removed. The portion of the steel rod stopper 31 other than the plastically deformed portion 32 does not need to be removed and remains as it is.

Subsequently, as shown in FIG. 5, a relay member 31c is inserted into the gap 33 between the upper end surface of the lower steel rod 31a and the lower end surface of the upper steel rod 31b, and the lower steel rod 31a and the upper steel are inserted. The rod 31b is connected via the relay member 31c. Specifically, the upper end surface of the lower steel rod 31a and the lower end surface of the relay member 31c are joined by welding, and the lower end surface of the upper steel rod 31b and the upper end surface of the relay member 31c are joined by welding. The relay member 31c is preferably a round steel rod having the same diameter as the lower steel rod 31a and the upper steel rod 31b, but the material or diameter can be changed as appropriate. Further, the means for joining the relay member 31c to the lower steel rod 31a and the upper steel rod 31b does not necessarily have to be welding, and may be adhesion or any kind of means. ..

As a result, the lower steel rod 31a and the upper steel rod 31b connected via the relay member 31c become one continuous round steel rod, so that the plastically deformed portion 32 is removed instead of the steel rod stopper 31. Therefore, it functions as a stopper for connecting the bridge pier 11 which is a substructure and the bridge girder 21 which is a superstructure.

As described above, the replacement steel rod stopper mounting structure in the present embodiment includes the lower accommodating cavity 15 formed in the bridge pedestal 11 and the upper accommodating cavity 23 formed in the bridge girder 21 mounted on the bridge pedestal 11. A steel rod stopper 31 having at least the lower end accommodated in the lower accommodating cavity 15 and at least the upper end accommodated in the upper accommodating cavity 23, and a lower steel rod 31a having at least the lower end accommodated in the lower accommodating cavity 15. At least the upper end is provided with the upper steel rod 31b housed in the upper housing cavity 23, and the lower steel rod 31a and the upper steel rod 31b can be joined via the relay member 31c. As a result, when the steel rod stopper 31 is plastically deformed, the lower steel rod 31a and the upper steel rod 31b are joined via the relay member 31c to function as a replacement stopper in place of the steel rod stopper 31. Can be done. Therefore, the steel rod stopper 31 can be easily and quickly replaced.

Further, there is a gap 33 into which the relay member 31c can be inserted between the upper end surface of the lower steel rod 31a and the lower end surface of the upper steel rod 31b. Therefore, the relay member 31c is inserted into the gap 33, the upper end surface of the lower steel rod 31a and the lower end surface of the relay member 31c are joined, and the lower end surface of the upper steel rod 31b and the upper end surface of the relay member 31c are joined. By joining, the lower steel rod 31a and the upper steel rod 31b can be easily and quickly joined.

Further, the lower steel rod 31a and the upper steel rod 31b are arranged side by side with the steel rod stopper 31. Therefore, the replacement stopper that replaces the steel rod stopper 31 can be easily and quickly functioned.

Further, the steel rod stopper 31 is made of a round steel rod, and the lower steel rod 31a and the upper steel rod 31b are made of a round steel rod having the same diameter as the steel rod stopper 31. Therefore, a replacement stopper having the same strength as the steel rod stopper 31 can be obtained.

Further, the exposed portion 32 of the steel rod stopper 31 between the pier 11 and the bridge girder 21 can be cut and removed. Therefore, the plastically deformed portion 32 of the steel rod stopper 31 can be easily removed.

It should be noted that the disclosure herein 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 replacement steel rod stopper mounting structures and methods.

11 Pier 15 Lower accommodation cavity 21 Bridge girder 23 Upper accommodation cavity 31 Steel rod stopper 31a Lower steel rod 31b Upper steel rod 31c Relay member 33 Gap

Claims (7)

The lower housing cavity formed in the substructure and
An upper housing cavity formed in the superstructure placed on the substructure, and
A steel rod stopper whose lower end is housed in the lower housing cavity and whose upper end is housed in the upper housing cavity.
A lower steel rod whose lower end is housed in the lower housing cavity,
At least the upper end is provided with an upper steel rod housed in the upper housing cavity.
Wherein the lower steel bar and the upper steel rod Ri bondable der via the relay member,
The Replacement steel bar stopper mounting structure characterized that you exist insertable gap the relay member between the upper surface and the lower end face of the upper steel rod of the lower steel rods. The lower housing cavity formed in the substructure and
An upper housing cavity formed in the superstructure placed on the substructure, and
A steel rod stopper whose lower end is housed in the lower housing cavity and whose upper end is housed in the upper housing cavity.
A lower steel rod whose lower end is housed in the lower housing cavity,
At least the upper end is provided with an upper steel rod housed in the upper housing cavity.
The lower steel rod and the upper steel rod can be joined via a relay member.
A replacement steel rod stopper mounting structure, wherein a portion of the steel rod stopper exposed between the substructure and the superstructure can be cut and removed. The replacement steel rod stopper mounting structure according to claim 1 or 2, wherein the lower steel rod and the upper steel rod are arranged side by side with the steel rod stopper. The replacement steel according to any one of claims 1 to 3, wherein the steel rod stopper is made of a round steel rod, and the lower steel rod and the upper steel rod are made of a round steel rod having the same diameter as the steel rod stopper. Rod stopper mounting structure. The replacement steel rod stopper mounting structure according to any one of claims 1 to 4, wherein the substructure is a rigid frame viaduct or a pier, and the superstructure is a bridge girder. At least the lower end of the steel rod stopper is accommodated in the lower accommodating cavity formed in the substructure, and at least the upper end of the steel rod stopper is accommodated in the upper accommodating cavity formed in the superstructure placed on the substructure. To do and
At least the lower end of the lower steel rod is accommodated in the lower accommodating cavity, at least the upper end of the upper steel rod is accommodated in the upper accommodating cavity, and the lower steel rod and the upper steel rod are accommodated via a relay member. Including making it joinable,
A method for attaching a replacement steel rod stopper , characterized in that there is a gap into which the relay member can be inserted between the upper end surface of the lower steel rod and the lower end surface of the upper steel rod . At least the lower end of the steel rod stopper is accommodated in the lower accommodating cavity formed in the substructure, and at least the upper end of the steel rod stopper is accommodated in the upper accommodating cavity formed in the superstructure placed on the substructure. To do and
At least the lower end of the lower steel rod is accommodated in the lower accommodating cavity, at least the upper end of the upper steel rod is accommodated in the upper accommodating cavity, and the lower steel rod and the upper steel rod are accommodated via a relay member. and allowing bonding, only contains,
A method for attaching a replacement steel rod stopper, wherein a portion of the steel rod stopper exposed between the substructure and the superstructure can be cut and removed.

Images