JPH093827A - Bridge movement limiting anchor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine a relative positioning between an anchor cap and an anchor bar easily and definitely without using any other material but for the anchor cap and the anchor bar. SOLUTION: There are provided an anchor bar 5 integrally buried in a pier 2, which supports both end of a bridge girder in the longitudinal direction of a bridge, or a pedestal and an anchor cap 6, which segments a movable space in the girder with the anchor bar 5 in the longitudinal direction and is fitted in the anchor bar 5 and an anchor holding part 7 which is installed to the anchor cap 6 and determines a relative position between the anchor cap 6 and the anchor bar 5. The anchor holding part 7 allows a relative movement between the anchor bar 5 and the anchor cap 6 when a longitudinal force, which acts on the anchor cap 6, exceeds a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention limits the movement of a bridge girder in a direction perpendicular to its bridge axis, absorbs normal movement in the bridge axis direction, and functions as a stopper for the bridge girder in an emergency such as an earthquake. An anchor device for movement limitation.

[0002]

2. Description of the Related Art Generally, a bridge in which both ends in the axial direction of the bridge girder are supported by bridge piers or abutments is a bridge girder in the axial direction of the bridge due to temperature changes of concrete, drying shrinkage, and bending of the girder due to its own weight. Although it expands and contracts, in order to allow such a normal movement of the bridge girder in the direction of the bridge axis and to limit the movement of the bridge girder in the direction perpendicular to the bridge axis, an anchor device for limiting bridge movement is provided with an anchor cap with an oval cross section. is there. In addition, this bridge movement limiting anchor device uses the amount of movement in the bridge axis direction and the direction perpendicular to the bridge axis due to the engagement between the anchor cap and the anchor bar when a large movement acts on the bridge girder, etc. in an emergency such as an earthquake. In order to prevent the bridge girders from falling from the piers or abutments, a plurality of girders are arranged side by side in the direction perpendicular to the bridge axis of the piers or abutments.

As an anchor device for restricting bridge movement of the prior art, as shown in FIGS. 9 and 10, the anchor bar 200 is provided with a bridge pier 201 so that its tip projects upward.
(Or, it is normally used by embedding and fixing it in the abutment) and inserting the protrusions of the anchor bar 200 inside the anchor caps 203 embedded at both ends of the bridge girder 202. Here, a spiral reinforcing bar 204 is embedded around the anchor cap 203 in order to maintain hole strength, and a deformable filler 205 is filled between the inner surface of the anchor cap 203 and the anchor bar 200. . Then, when the bridge girder 202 expands and contracts due to changes in the temperature of concrete, drying shrinkage, etc., the bridge girder 20 is anchored by the anchor bar 200 of the anchor cap 203 having an oval cross section.
The expansion and contraction in the bridge axis direction of No. 2 are allowed within a certain range, and when a large movement acts on the bridge girder 202 in an emergency such as an earthquake, the movement amount is changed between the anchor cap 203 and the anchor bar 200. To prevent the bridge girder 202 from falling off the pier 201.

However, in the prior art bridge movement limiting anchor device, a fluid filler is filled between the anchor cap 203 and the anchor bar 200 for the purpose of rust prevention. Cannot be positioned. Also, the work of filling the fluid material is very troublesome.

In order to solve this problem, as a bridge movement limiting anchor device, there is one described in Japanese Utility Model Publication No. 2-46489. As shown in FIG. 11, this type of bridge movement limiting anchor device includes an anchor bar 251 embedded in a pier or an abutment and an elastic material center holding packing 253 having an anchor bar fitting concave surface 252.
And an anchor cap 254 having a cross section. The anchor cap 254 has the fitting concave surface 252 of the packing 253 interposed between the anchor cap 254 and the anchor bar 251 while forming the movement permitting space of the anchor bar 251 at both ends of the packing 253 in the longitudinal direction. 251 is engaged with the anchor cap 254 and the anchor bar 251 to limit the movement of the bridge girder in the direction perpendicular to the bridge axis, and the anchor bar 251 moves in the allowable space to allow free movement of the bridge girder in the bridge axis direction. The movement is allowed, and the movement in the bridge axis direction and the direction perpendicular to the bridge axis is restricted by the engagement of the anchor cap 254 and the anchor bar 251 in an emergency such as an earthquake. Then, the anchor cap 254 is fitted with the fitting concave surface 25 of the packing 253.
Anchor bar 2 so that it is located at the center of its cross section at 2
It is held at 51.

As an anchor device for limiting the movement of a bridge, there is one described in Japanese Patent Laid-Open No. 3-21703. As shown in FIG. 12, an anchor device for restricting bridge movement of this type has an anchor bar 3 embedded in a pier or abutment.
00, a brim-shaped elastic body 302 integrally fitted to the anchor bar 300, and an anchor cap 303. The anchor cap 303 has the collar-shaped elastic body 302 interposed between the anchor cap 300 and the anchor bar 300, and is movably fitted to the anchor bar 300 along the direction perpendicular to the bridge axis of the bridge girder. The movement of the bridge girder in the direction perpendicular to the bridge axis is restricted by the engagement of the anchor bar 300 with the anchor bar 300, and the anchor cap 303 is allowed to move freely in the bridge axis direction by moving in the bridge axis direction of the bridge girder. In an emergency such as an earthquake, anchor cap 3
The engagement between 03 and the anchor bar 300 restricts the movement in the bridge axis direction and the direction perpendicular to the bridge axis. In addition, the collar-shaped elastic body 3
By cutting 02 into a predetermined shape, the anchor bar 3
00 and the anchor cap 303 are positioned relative to each other to hold the anchor cap 303 on the anchor bar 300.

[0007]

However, in such a prior art bridge movement-restricting anchor device, a member different from the anchor cap such as packing or collar-shaped elastic body is provided between the anchor cap and the anchor bar. Since the interposition is used to determine the relative position of the anchor cap with respect to the anchor bar, it takes time and effort to dispose the separate member between the anchor cap and the anchor bar, and therefore the relative position with respect to the anchor cap. There is a problem that the work becomes complicated and the time required for the positioning is long.

The present invention has been made in order to solve such a problem, and the relative work of the anchor cap with respect to the anchor bar can be performed easily and in a short time without using a material other than the anchor cap and the anchor bar. It is an object of the present invention to provide an anchor device for restricting the movement of a bridge, which can be accurately positioned.

[0009]

In order to solve the above problems, in the bridge movement limiting anchor device of the present invention, in claim 1, the bridge device is integrally formed with a bridge pier or an abutment supporting both ends of the bridge girder in the bridge axial direction. An embedded anchor bar, an anchor cap fitted to the anchor bar by partitioning a movement-allowed space in the bridge axis direction of the bridge girder between the anchor bar, and the anchor bar provided on the anchor cap. An anchor holding part for determining a relative position to the anchor cap, wherein the anchor holding part, when the force acting on the anchor cap from the bridge axial direction becomes a predetermined force or more, the anchor bar and the anchor. It allows relative movement with the cap. As a result, the anchor cap is provided with the anchor holding portion that determines the relative position between the anchor cap and the anchor bar, so that the anchor cap can be easily engaged with the anchor bar in a short time. It is possible to position the anchor cap in place. Further, when the force in the bridge axis direction is less than or equal to a predetermined force, the relative position between the anchor cap and the anchor bar is held by the anchor holding portion, and the anchor cap is more than the predetermined value in the bridge axis direction of the bridge girder. When a force is applied, each protrusion of the anchor holding portion is deformed, and the anchor holding portion can allow relative movement between the anchor bar and the anchor cap.

In the second aspect, in addition to the first aspect,
The anchor holding portion is integrally formed with the anchor cap at predetermined intervals in the bridge axis direction of the bridge girder, and is composed of a plurality of projections for holding the anchor bar. Thus, by sandwiching the anchor bar with the protrusions provided integrally with the anchor cap, the relative positioning of the anchor cap with respect to the anchor bar can be performed with this protrusion easily and in a short time. At the same time, since a plurality of protrusions are provided at a predetermined interval in the bridge axis direction of the bridge girder, select an arbitrary protrusion from among the plurality of protrusions to sandwich the anchor bar,
The relative position of the anchor cap with respect to the anchor bar can be changed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a bridge movement limiting anchor device according to an embodiment of the present invention will be described with reference to the drawings. 1 is a side view showing the configuration of a bridge movement limiting anchor device in the present embodiment, and FIG. 2 is a front view showing the configuration of a bridge movement limiting anchor device in the present embodiment,
FIG. 3A is a cross-sectional view taken along the line AA of FIG. 1 showing the configuration of the bridge movement limiting anchor device in the present embodiment, and FIG. 3B shows the configuration of the bridge loss movement limiting anchor device in the present embodiment. FIG. 4 is a perspective view showing a main part of the bridge girder of the bridge movement limiting anchor device of the present embodiment in the axial direction.

1 to 3, reference numeral 1 denotes an anchor device for limiting the movement of a bridge, which includes an abutment 2 (or a bridge pier) and a bridge girder 4 supported at both ends in the bridge axial direction. It is located between. Further, a large number of the bridge movement limiting anchor devices 1 are arranged side by side in the direction perpendicular to the bridge axis of the bridge girder 4, and are configured with the anchor bar 5, the anchor cap 6, and the anchor holding portion 7 as main parts. The anchor bar 5 is embedded in the abutment 2 (or may be a pier) and extends a predetermined length toward the bridge girder 4 side. The anchor cap 6 is made of a material such as soft plastic, has an internal space A, and has a cylindrical body 15 having a horizontally elongated circular cross section, and a lid that covers one end opening 15a of the cylindrical body. It is composed of the body 16. Then, the anchor cap 6 positions the relative position with respect to the anchor bar 5 from the opening 15b side of the tubular body 15 via the anchor holding portion 7 to the central portion of the tubular body 15 in the longitudinal direction of the oblong circular shape. Are arranged on the abutment 2 via the foam frame 17 while partitioning the movable spaces B, B on both sides of the bridge girder 4 in the bridge axis direction with the anchor bar 5 as a boundary. .

The anchor holding portion 7 has an anchor cap 5
Is formed integrally with the longitudinal side surfaces 15c and 15d in the tubular body 15 and has a plurality of projections 21 to 24 each having a triangular cross section and having a diameter reduced toward the inside space A of the tubular body 15. Each of the protrusions 21 to 24 has a long side surface 15c of the tubular body 15,
15d is provided with two places 21, 22 and 23, 24 as a pair, and each pair of protrusions 21 and 22, or 23 and 24, with the center Z in the longitudinal direction of the tubular body 15 as a boundary, It projects in the internal space A of the tubular body 15 at predetermined intervals H (interval smaller than the diameter D of the anchor bar) in the longitudinal direction. Moreover, each protrusion 21-24
Extends in parallel with the axis of the anchor bar 5 from the lid 6 side of the anchor cap 6 to the opening 15b. Then, the respective projections 21 to 24 of the anchor holding portion 7 abut and engage with the outer peripheral surface 5A of the anchor bar 5 to sandwich the anchor bar 5. As a result, the anchor holding portion 7 positions the relative position of the anchor cap 6 with respect to the anchor bar 5 at the center portion Z of the tubular body 15 in the longitudinal direction of the horizontally elongated circular shape. Reference numeral 30 denotes a spiral reinforcing bar which is externally fitted and arranged to reinforce the anchor cap, and is embedded and fixed together with the anchor cap 6 in the bridge concrete 32 that is cast in the space perpendicular to the bridge axis of the bridge girder 4. Has been done.

Further, each of the protrusions 21 to 24 constituting the anchor holding portion 7 has such strength as to be deformed when a force more than the force due to the pouring of the bridge concrete 32 is received from the bridge axial direction. As a result, even if the anchor cap receives the force from placing the bridge concrete 32 from the bridge axial direction, the projections 21 to 24 of the anchor holding portion 7 hold the anchor bar 5 without being deformed. The relative positions of 6 and the anchor bar 5 do not shift.

When the bridge girder 4 receives a force (a force larger than the force due to the placement of the bridge concrete 32) accompanied by a large movement in the bridge axis direction, the anchor cap 6 also follows the movement of the bridge girder 4. Move in the bridge axis direction of the bridge girder 4. In this way, when the anchor cap 6 is moved in the bridge axis direction of the bridge girder 4, as shown in FIG.
1 to 24 in the moving direction, for example, the protrusions 21 and 2
3 is deformed, and finally the anchor bar 5 becomes
Since the relative movement of the anchor bar 5 and the anchor cap 6 is allowed after overcoming Nos. 1 and 23, the anchor bar 5 moves relative to the anchor cap 6 in the movement allowance space B of the anchor cap 6. Finally, the anchor bar 5 engages with the anchor cap 6 from the bridge axial direction to restrict the movement of the bridge girder 4 in the bridge axial direction. Further, when the bridge girder 4 expands and contracts in the bridge axis direction due to the temperature change of the concrete of the bridge girder 4 in the normal time, the bending due to the drying shrinkage, and the like, the anchor bar 5 causes the protrusions 21 to move in the same manner as above.
By deforming and climbing over ~ 24, free movement of the anchor cap within the movement allowable space B is ensured.

As described above, according to the bridge movement limiting anchor device 1 of this embodiment, the anchor formed integrally with the tubular body 15 only by fitting the anchor cap 6 onto the anchor bar 5. Each of the protrusions 21 of the holding portion 7
The anchor bar 5 is sandwiched by 24, and the anchor cap 6
Is held so as not to move in the direction perpendicular to the bridge axis of the bridge girder 4 and in the direction of the bridge axis, and the relative position of the anchor cap 6 to the anchor bar 5 is positioned at the central portion of the tubular body 15 in the longitudinal direction of the oblong circular shape. Therefore, the anchor cap 6 can be positioned at a predetermined position in a short time with a simple operation.

When the bridge concrete 32 is cast, the relative positions of the anchor cap 6 and the anchor bar 5 are held by the projections 21 to 24, and the anchor cap 6 is in the bridge axis direction of the bridge girder 4. When a force more than a predetermined amount (a force more than the force by placing the bridge concrete 32) is received from
Since the protrusions 21 to 24 of the anchor holding part 7 are deformed and the anchor holding part 7 allows the relative movement of the anchor bar 5 and the anchor cap 6, the movement of the bridge girder 4 in the bridge axis direction is allowed to move. It can be performed reliably without being hindered in the space B, and finally, the anchor bar 5 can be engaged with the anchor cap 6 to limit the movement in the bridge axis direction.

In the bridge movement limiting anchor device 1 according to this embodiment, the projections 21 to 24 constituting the anchor holding portion 7 have been described, but the number of the projections is not limited to this, and As shown in FIG. 5, each longitudinal side surface 15 c, 15 d of the tubular body 15 of the anchor cap 5
Alternatively, the protrusions 21 to 28 may be integrally formed at a plurality of locations with a predetermined gap H (space smaller than the diameter D of the anchor bar) therebetween in the longitudinal direction.
Thereby, when the anchor cap 6 is externally fitted to the anchor bar 5, by selecting an arbitrary projection from the plurality of projections 21 to 28 and sandwiching the anchor bar 5, the anchor cap 6 is attached to the anchor bar 5. The relative position can be changed, and the anchor cap 6 can be positioned at an arbitrary position in the bridge axis direction of the bridge girder 4 in accordance with the conditions when the bridge girder 4 and the like are constructed.

Further, in the bridge movement limiting anchor device 1 of this embodiment, the projections 21 to 24 of the anchor holding portion 7 are integrally formed with the anchor cap 6, but the invention is not limited to this. But not FIG. 6 (a)
After the protrusions 21 to 24 are formed separately from the anchor cap 6, as shown in FIG.
Each of the longitudinal side surfaces 15c and 15d may be physically fixed to the anchor cap 6 by being fixed to each of the longitudinal side surfaces 15c and 15d through an adhesive portion 35 so as to withstand the force of driving the bridge concrete 32. Thereby, when the bridge concrete 32 is cast, the relative positions of the anchor cap 6 and the anchor bar 5 are held by the respective projections 21 to 24, and the anchor cap 6 is provided in a predetermined direction from the bridge axis direction of the bridge girder 4. When the above-mentioned force (a force equal to or greater than the force of placing the bridge concrete 32) is received, as shown in FIG. 6B, the anchor bar 5 is in the moving direction among the protrusions 21 to 24, for example, the protrusions. 21 and 23 are deformed, and finally, the protrusions 21 and 23 are damaged from the adhesive portion 35 thereof, and relative movement of the anchor bar 5 and the anchor cap 6 is allowed, so that the anchor cap 6 is allowed to move. While being moved in the space B in the bridge axis direction of the bridge girder 4 without being obstructed, the anchor bar 5 finally engages with the anchor cap 6 from the bridge axis direction to move the bridge girder 4 in the bridge axis direction. To It is limited.

Further, in the bridge movement limiting anchor device 1 of the present embodiment, the anchor cap 6 is made of a material such as plastic or soft plastic, but it is not limited to this. It may be formed of aluminum, aluminum, an aluminum alloy, or the like. In this case, the projections 21 to 22 integrally formed on the longitudinal side surfaces 15c and 15d of the tubular body 15 of the anchor cap 6 are not shown in FIG. As shown in FIG. 7 (a), breaking grooves 40 and 41 extending from the lid 16 of the tubular body 15 toward the opening 15b are provided at the boundaries between the projections 21 to 24 and the longitudinal side surfaces 15c and 15d. Yes, this break groove 40, 41
Has a depth h capable of withstanding the force of placing the bridge concrete 32. Thereby, when the bridge concrete 32 is cast, the relative positions of the anchor cap 6 and the anchor bar 5 are held by the respective projections 21 to 24, and the anchor cap 6 is provided in a predetermined direction from the bridge axis direction of the bridge girder 4. When the above-mentioned force (force equal to or greater than the force due to the placing of the bridge concrete 32) is received, the anchor bar 5 is in the moving direction among the protrusions 21 to 24, as shown in FIG. 21 and 23 are deformed, and finally, the projections 21 and 23 are broken from the fracture surfaces 40 and 41, and the relative movement of the anchor bar 5 and the anchor cap 6 is allowed. While being moved in the movement allowance space B in the bridge axis direction of the bridge girder 4 without being obstructed, the anchor bar 5 finally engages with the anchor cap 6 from the bridge axis direction to move in the bridge axis direction of the bridge girder 4. of To limit the movement.

Further, in the bridge movement limiting anchor device 1 of this embodiment, the projections 21 to 24 of the anchor holding portion 7 are integrally formed with the anchor cap 6, but the invention is not limited to this. Figure 8
As shown in FIG. 3, the protrusions 21 to 24 are formed separately from the anchor cap 6, and the longitudinal sides 15c and 15d of the tubular body 15 of the anchor cap 6 are separated from each other by a predetermined distance H (anchor) in the longitudinal direction. A plurality of groove portions 45 to 48 extending from the lid body 16 side of the anchor cap 6 to the opening portion 15b side are formed at a distance smaller than the diameter D of the bar), and the protrusions 21 to 24 are formed in the groove portions 45 to 48. To the inner space A of the cylindrical body 15 and physically integrated with the anchor cap 6 to obtain the same effect as the above embodiment. it can.

[0022]

As described above, according to the bridge movement limiting anchor device of the present invention, in claim 1, the anchor cap is provided with the anchor holding portion for determining the relative position between the anchor cap and the anchor bar. Therefore, it is possible to position the anchor cap at a predetermined position by a simple work of fitting the anchor cap to the anchor bar and in a short time. Further, when the force in the bridge axis direction is less than or equal to a predetermined force, the relative position between the anchor cap and the anchor bar is held by the anchor holding portion, and the anchor cap is more than the predetermined value in the bridge axis direction of the bridge girder. When receiving a force, each protrusion of the anchor holding part deforms and the anchor holding part allows relative movement between the anchor bar and the anchor cap, so that the movement of the bridge girder in the bridge axis direction is within the movement allowable space. It can be performed reliably without hindrance, and finally, the anchor bar can engage with the anchor cap to limit the movement in the bridge axial direction.

In the second aspect, in addition to the effect of the first aspect,
By sandwiching the anchor bar with the protrusions provided integrally with the anchor cap, the relative positioning of the anchor cap with respect to the anchor bar can be performed easily with this protrusion in a short time, and the protrusion can be achieved. Are provided at predetermined intervals in the bridge axis direction of the bridge girder, so select any of these projections to hold the anchor bar and change the relative position of the anchor cap to the anchor bar. It is possible to position the anchor cap at an arbitrary position in the bridge axis direction of the bridge girder according to the construction conditions such as the bridge girder.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a bridge movement limiting anchor device according to an embodiment of the present invention.

FIG. 2 is a front view showing a configuration of a bridge movement limiting anchor device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a bridge movement limiting anchor device according to an embodiment of the present invention, in which FIG.
A sectional view, (b) is a perspective view.

FIG. 4 is an enlarged view of an essential part for explaining the movement of the bridge girder in the bridge axis direction in the bridge movement limiting anchor device according to the embodiment of the present invention.

FIG. 5 is an enlarged view of a main part for explaining a first modified example of the protrusion of the anchor holding portion of the anchor device for restricting bridge movement of the embodiment of the present invention.

FIG. 6 is a view for explaining a second modified example of the protrusion of the anchor holding portion of the bridge movement limiting anchor device of the embodiment of the present invention, in which (a) shows the configuration of the protrusion of the anchor holding portion. FIG. 4B is an enlarged view of a main part, and FIG. 7B is an enlarged view of the main part showing the operation of the protrusion of the anchor holding part.

FIG. 7 is a view for explaining a third modified example of the protrusion of the anchor holding portion of the bridge movement limiting anchor device of the embodiment of the present invention, in which (a) shows the configuration of the protrusion of the anchor holding portion. FIG. 4B is an enlarged view of a main part, and FIG. 7B is an enlarged view of the main part showing the operation of the protrusion of the anchor holding part.

FIG. 8 is an enlarged view of a main part for explaining a fourth modified example of the protrusion of the anchor holding portion of the bridge movement limiting anchor device of the embodiment of the present invention.

FIG. 9 is a front view showing the configuration of a conventional anchor device for restricting bridge movement.

10 is a sectional view taken along line BB in FIG.

FIG. 11 is a cross-sectional view showing a structure of an anchor device for restricting bridge movement using a conventional packing having a special shape.

FIG. 12 is a cross-sectional view showing the configuration of a bridge movement limiting anchor device capable of changing the relative positions of an anchor cap and an anchor bar in the bridge axis direction according to the related art.

[Explanation of symbols]

 1 Anchor device for bridge movement restriction 2 Bridge pier 4 Bridge girder 5 Anchor bar 6 Anchor cap 7 Anchor holding part 21-28 Protrusion 45-48 Groove part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinari Oda 172 Itazawa-cho, Yamatokoriyama-shi, Nara Nita factory Nara Co., Ltd. (72) Inventor Masanori Shingu 7-44-5 Nishi-Kamata, Ota-ku, Tokyo Dat Kogyo Co., Ltd. Within

Claims (2)

[Claims] 1. An anchor bar that is integrally embedded in a pier or abutment that supports both ends of the bridge girder in the bridge axis direction, and an allowable movement space is defined in the bridge girder direction between the anchor bar and the anchor bar. An anchor cap fitted to the anchor bar, and an anchor holding part provided on the anchor cap for determining a relative position between the anchor bar and the anchor cap, the anchor holding part is provided on the anchor cap. An anchor device for limiting the movement of a bridge, which allows relative movement between the anchor bar and the anchor cap when the acting force from the bridge axial direction becomes a predetermined force or more. 2. The anchor holding portion is integrally formed with the anchor cap at predetermined intervals in the bridge axial direction of the bridge girder and is formed of a plurality of projections for holding the anchor bar. An anchor device for limiting the movement of a bridge according to claim 1.