JP2913597B2 - Corrosion-resistant movable anchor type fall prevention device and anchor bar used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrosion-resistant movable anchor-type bridge prevention device used for a corrosion-resistant movable anchor-type bridge prevention device for preventing a bridge from falling, and an anchor bar used therefor, and is particularly constructed of a PC floor slab. The present invention belongs to a corrosion-resistant movable anchor type fall prevention device for preventing a bridge girder from falling and an anchor bar used therefor.

[0002]

2. Description of the Related Art Various bridge girder structures have been developed and provided. One of them is a prestressed concrete girder (hereinafter, referred to as "PC girder").

A PC girder has low noise and vibration, is easy to maintain and manage, and in particular, is a pretension type PC.
The girder has the advantages of good quality control and shortening the construction period because it is a factory product.

The PC girder is a main girder made of prestressed concrete having a rectangular cross section, a box shape, or a T-shape, and a plurality of PC girder are juxtaposed at a required interval in a direction perpendicular to the girder axis at an abutment or between abutments. Things. A floor slab (hereinafter, referred to as a “PC floor slab”) is constructed by placing interposed concrete (mortar or concrete) in the gap between the PC girders. At this time, the anti-corrosion movable anchor type fall prevention device fixes the PC slab to the abutment.

Various types of corrosion-resistant movable anchor-type bridge prevention devices have been developed and provided, and the present applicant has proposed many of them (Japanese Utility Model Application No. 58-104550, Japanese Utility Model Application No. 58-1).
No. 22227). Most of the currently used anticorrosion movable anchor type fall prevention devices are proposed by the present applicant, and have been evaluated as having excellent anticorrosion properties and durability. An example of a proposal proposed by the present applicant is as follows. An anchor cap having a long hole in cross section, a holding packing fitted in the anchor cap, a lower part is fixed to an abutment or the like, and an upper part is fixed to a PC floor slab. , And an anchor bar inserted through the holding packing.

In addition, the invention according to the above-mentioned application has the drawbacks of falling off of the anchor bar, rotation and lifting of the anchor cap due to tolerances. Therefore, the present applicant has developed an anticorrosion movable anchor type fall prevention device which improves the above application. It has been proposed (Japanese Patent Application No. 7-209288).

[0007]

However, in the above-described corrosion-resistant movable anchor type fall prevention device according to the prior art, many components (holding packings, bolts, nuts, etc.) are required, so that it takes a long time to assemble, and the cost of parts is low. Was expensive. In addition, there is a problem that the manufacturing cost of the corrosion-resistant movable anchor type fall prevention device is high.

[0008] Furthermore, the earthquake-resistant standards for anticorrosion movable anchor type fall prevention devices will be reviewed in the wake of the Great Hanshin Earthquake. In order to meet the new seismic standard, the retaining packing in the prior art has no cushioning function,
It is said that a buffer packing must be provided in addition to the holding packing. Therefore, the manufacturing cost of the corrosion-resistant movable anchor type fall prevention device increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to be able to comply with a new seismic standard, to shorten the assembly time, and to reduce the manufacturing cost. An object of the present invention is to provide an apparatus for preventing a falling bridge and an anchor bar used therefor.

The gist of the invention described in claim 1 is that the lower part is fixed to the abutment or the like at a gap between a plurality of PC girders installed on the abutment, the pier or the like at a required interval in the direction perpendicular to the axle axis. The PC, comprising: an anchor bar; and an anchor cap that is put on an upper portion of the anchor bar and that is embedded in a filling material such as concrete or mortar that is cast into a gap in a direction perpendicular to the bridge axis of each PC girder. A corrosion-resistant movable anchor-type fall prevention device used for fixing a floor slab constructed of a girder and the filling material to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. The anchor cap is covered with a cushioning material, and the inner surface of the anchor cap has a width spaced at least in front and rear in the bridge axis direction with the outer surface of the anchor bar, and the cushioning material has a tip end. To the part buried in the abutment, etc., and formed so that the dimension of the part buried in the abutment etc. is smaller than the dimension of the part existing in the anchor cap. An anticorrosion movable anchor type fall prevention device having a step portion flush with a lower end surface of an anchor cap. Claim 2
The gist of the described invention is that an anchor bar, which is located in a gap between a plurality of PC girders installed on an abutment, a pier, or the like at a required interval in a direction perpendicular to the axle, and whose lower part is fixed to the abutment, An anchor cap which is put on the upper part of the bar and is buried in a filling material such as concrete or mortar which is cast in a gap in a direction perpendicular to the bridge axis of each PC girder,
An anticorrosion movable anchor-type bridge prevention device used for fixing a floor slab constructed by the PC girder and the filling material to an abutment or the like, wherein the anchor bar exists at least in the anchor cap on the outer periphery thereof. A portion is covered with a cushioning material in the shape of a prism having an outer contour, and the anchor cap has a width whose inner surface is spaced from the outer surface of the anchor bar at least in the front-back direction in the bridge axis direction. To parts buried in abutments, etc.
A step portion is formed so that the dimension of a portion embedded in an abutment or the like is smaller than the dimension of a portion existing in the anchor cap, and a step portion which is flush with a lower end surface of the anchor cap at a position where the dimension changes. The present invention is directed to a corrosion-resistant movable anchor type fall prevention device characterized by having: The gist of the invention according to claim 3 is that an anchor bar, which is located in a gap between a plurality of PC girders installed on an abutment, a pier, or the like at a required interval in a direction perpendicular to the axle, and whose lower part is fixed to the abutment or the like. An anchor cap that is placed on the upper part of the anchor bar and is buried in a filling material such as concrete or mortar that is cast into a gap in a direction perpendicular to the bridge axis of each PC girder.
An anticorrosion movable anchor-type bridge prevention device used for fixing a floor slab constructed by the PC girder and the filling material to an abutment or the like, wherein the anchor bar exists at least in the anchor cap on the outer periphery thereof. A portion of the anchor cap is covered with a cushioning material, and the inner surface of the anchor cap has a width spaced at least in the longitudinal direction from the outer surface of the anchor bar in the bridge axis direction. Is provided with a falling-off prevention member which is prevented from falling off from the anchor cap and which can be deformed as the anchor cap is moved. The gist of the invention described in claim 4 is that a plurality of PCs installed on an abutment, a pier, or the like at a required interval in a direction perpendicular to the bridge axis.
An anchor bar, which is located in the gap between the girders and whose lower part is fixed to an abutment, etc .;
An anchor cap embedded in a filling material such as concrete or mortar that is cast into a gap in the direction perpendicular to the bridge axis of the girder, and the floor slab constructed by the PC girder and the filling material is used as an abutment or the like. A corrosion-resistant movable anchor-type bridge prevention device used for fixing, wherein at least a portion of the outer periphery of the anchor bar, which is present in the anchor cap, is covered with a cushioning material in a shape of an outer contour prism, and the anchor cap is An inner side surface has a width that is spaced apart from the outer side surface of the anchor bar at least before and after in the bridge axis direction, and at an inner lower end of the anchor cap, the anchor bar does not fall off the anchor cap, Corrosion-resistant movable anchor type drop bridge characterized by being provided with a fall prevention material that can be deformed as the anchor cap moves It resides in the stop unit. The gist of the invention according to claim 5 is that, at the inner lower end of the anchor cap,
The anticorrosion movable anchor type drop bridge according to claim 1 or 2, wherein the anchor bar is prevented from falling off from the anchor cap, and a fall-off preventing material that is deformable with movement of the anchor cap is provided. Exists in the prevention device.

According to a sixth aspect of the present invention, there is provided an abutment having an anchor bar having a lower portion fixed to an abutment or the like, and an anchor cap covering the upper portion of the anchor bar and being embedded in concrete, mortar or the like. An anchor bar used in a corrosion-resistant movable anchor-type bridge prevention device that fixes a floor slab to the anchor bar, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap covered with a buffer material, and the buffer material is From the tip to the part embedded in the abutment etc., it is formed so that the dimension of the part embedded in the abutment etc. is smaller than the dimension of the part existing in the anchor cap, and at the position where the dimension changes Is an anchor bar having a step portion flush with a lower end surface of the anchor cap. The gist of the invention according to claim 7 is an anchor bar used in a corrosion-resistant movable anchor type fall prevention device for fixing a floor slab to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. Is covered with a cushioning material in the shape of a prism having an outer contour, and the cushioning material extends from its tip to a portion buried in the abutment, etc. An anchor bar, which is formed so as to have a smaller dimension and has a step portion which is flush with a lower end surface of the anchor cap at a position where the dimension changes. The gist of the invention according to claim 8 resides in the anchor bar according to claim 6 or 7, wherein the anchor bar has a square cross section.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The anticorrosion movable anchor-type bridge prevention device A according to the present embodiment is used for fixing a PC floor slab S constructed by a pretension type PC girder to an abutment 3 or the like as shown in FIG. ing.

The PC floor slab S is composed of a plurality of PC girders 1 installed on the abutment 3 or the like at a required interval in a direction perpendicular to the bridge axis, and
It is constructed of interstitial concrete cast in the gap in the bridge axis direction of girder 1.

As shown in FIG. 2, the anticorrosion movable anchor type fall prevention device A is located in the gap between the PC girders 1 in the bridge axis direction (the left-right direction in FIG. 2) and the lower part is fixed to the abutment 3 or the like. An anchor bar 20 is provided on the anchor bar 20, and the anchor cap 10 is buried in a filling concrete (filling material) which is placed in a gap between the PC girders 1.

The anchor bar 20 is, as shown in FIG.
It is a straight steel bar with a square cross section.
Coated with

As shown in FIG. 2, the cushioning material 21 does not reach the lower end of the anchor bar 20, but also reaches a shallow portion such as the abutment 3, and has a step 21a in the vertical direction. The portion above the step portion 21a, in other words, the portion existing in the anchor cap 10 is formed in an outer contour prismatic shape.
As shown in FIG. 4, a portion other than the portion existing in the anchor cap 10, that is, a portion buried in the abutment 3 or the like is formed in an outer contour prism having a cross section smaller than that of the upper portion. ing.

As shown in FIG. 2, in the state where the corrosion-resistant movable anchor type bridge prevention device A is installed, the step portion 21a is provided.
Will be flush with the lower end surface of the anchor cap 10. The step portion 21a is hooked on the upper surface of the band-shaped rubber bearing 2, and the anchor bar 20 is provided with a pilot hole 4 formed in the abutment 3 or the like.
Is prevented from falling. The belt-shaped rubber bearing 2 has a hole through which the anchor bar 20 can pass, and is laid in a direction perpendicular to the bridge axis (a direction perpendicular to the paper surface of FIG. 2). Examples of the material of the cushioning material 21 include chloroprene rubber and the like.
What is necessary is just to adopt the soft rubber which can meet the new seismic standard.

As shown in FIGS. 2 and 3, the anchor cap 10 is a tubular body having a rectangular cross section with a closed top end and an open lower end. In the installed state, the inner dimension of the anchor cap 10 in the bridge axis direction in the cross section is larger than the length of the cushioning member 21 in the bridge axis direction, and the inner dimension in the direction perpendicular to the bridge axis is the same as that of the cushioning member 21 in the bridge axis direction. It is formed equal to the length. As a material of the anchor cap 10, a material suitable for carrying out the present invention, such as polyethylene or FRP, can be adopted.

Further, in the present embodiment, a sponge material 30 (fall prevention material) for preventing the anchor bar 20 from falling off the anchor cap 10 is provided at the lower end of the anchor cap 10. Sponge material 30
Is a thick plate having a rectangular shape in plan view,
In the gap between the anchor bar 20 and the anchor bar 20. The outer periphery of the sponge material 30 is fixed to the lower end of the inner surface of the anchor cap 10 and the side surface of the cushioning material 21 with an adhesive. Therefore, the anchor bar 20 does not fall off the anchor cap 10.

In order to assemble the corrosion-resistant movable anchor type bridge prevention device A as described above, first, the anchor bar 20 covered with the cushioning material 21 is inserted into the anchor cap 10 from the outer contour prismatic portion.

Next, the sponge material 3 is placed between the inner surface of the lower end of the anchor cap 10 and the outer surface of the anchor bar 20.
0 is inserted and fixed with an adhesive.

As described above, the corrosion-resistant movable anchor type fall prevention device A can be assembled.

Next, an anticorrosion movable anchor type fall prevention device A
A construction method using the method will be described with reference to FIGS. FIGS. 5, 7, 8 and 10 are longitudinal sectional views, and FIGS. 6 and 9 are plan views.

At the site, as shown in FIG. 5, a PC girder 1 is mounted on a belt-like rubber bearing 2 which is easily slidable at a required interval in a direction orthogonal to the bridge axis direction. Also, as shown in FIG. 6, the pilot hole 4 such as the abutment 3 into which the anchor bar 20 is to be inserted is visible from the hole provided in the band-shaped rubber bearing 2. In FIG. 5, the bridge axis direction is a direction orthogonal to the paper surface. In FIG. 6, the bridge axis direction is the vertical direction of the paper.

At such a site, first, a non-shrink mortar (fixed mortar) M is cast into the prepared hole 4 such as the abutment 3 as shown in FIG.

Next, as shown in FIGS. 8 and 9, the lower part of the anchor bar 20 of the anticorrosion movable anchor type bridge prevention device A pre-assembled in the factory is set in a non-shrink mortar M.
Insert inside. In FIG. 9, the anchor cap 10
Shows the state cut at the upper end of the. Then, the longitudinal direction in the cross section of the anchor cap 10 is matched with the bridge axis direction (the direction of expansion and contraction of the girder).

After the required strength has been developed in the non-shrink mortar M, a formwork (not shown) for the interlining concrete C is installed.

Next, as shown in FIG.
Clay concrete C is cast in the gap of C girder 1 and tamped with a vibrator. Through the above steps, a pretensioning type PC floor slab S can be constructed.

Next, the effect of the corrosion-resistant movable anchor type fall prevention device A configured as described above will be described.

Since the holding packing or the bolts and nuts required in the prior art are not required, the manufacturing cost can be reduced (in particular, the holding packing is more expensive than the cushioning material 21 according to the present embodiment). Is).

By simply increasing the thickness of the cushioning material 21, it is possible to easily meet the new seismic standards. In this regard, in the prior art, the thickness of the holding packing and the cross section of the anchor cap 10 must be increased, and a cushioning material must be newly provided. However, such a change increases the manufacturing cost.

Further, since the cushioning member 21 is formed integrally with the anchor bar 20, not only the cushioning effect but also rust prevention of the anchor bar 20 can be achieved without galvanizing or the like.

That is, according to the present embodiment, the cushioning material 2
With only one, the effects of the holding packing, the rust preventive material and the cushioning material, and the bolts and nuts in the prior art can be obtained.

In addition, since it is not necessary to insert the holding gasket into the anchor cap 10, insert a bolt, or fasten a nut, assembly time can be reduced. Since these operations are all manual operations, a reduction in assembly time leads to a reduction in manufacturing costs at present when labor costs are soaring.

Since the anchor cap 10 has a rectangular cross section, the anchor cap 10 can be pressed into contact with the entire surface of the cushioning material 21 when the PC floor slab S contracts, and the cushioning material 21 is biased. There is no pressure.

Further, since the anchor bar 20 also has a square cross section, the pressing force transmitted to the anchor bar 20 via the cushioning material 21 is not unevenly distributed.

Conventionally, there has been a problem in that the anchor cap 10 rotates when the concrete filling C is poured. However, since the cushioning member 21 is formed in a prismatic shape, and the inner dimension of the anchor cap 10 in the direction perpendicular to the bridge axis is equal to the length of the buffer member 21 in the bridge axis direction, rotation of the anchor cap 10 can also be prevented.

In addition, anticorrosion movable anchor type fall prevention device A
Is installed on the belt-shaped rubber bearing 2, the anchor bar 20 does not drop into the pilot hole 4 until the non-shrink mortar M hardens.

Usually, rust often occurs near the casting surface of concrete (non-shrink mortar in this embodiment). However, the cushioning material 21 according to the present embodiment
Can reach the buried portion such as the abutment 3 and the like, so that the anchor bar 20 can be completely prevented from rusting. The cushioning material 21
The part not covered with the mortar does not rust because it is buried in the mortar.

Although the anchor bar 20 and the cushioning material 21 according to the above embodiment have rectangular cross sections, the present invention is not limited to this.
A shape suitable for carrying out the present invention can be obtained.

Further, the present invention can be applied irrespective of a pretension system or a post-tension system. Further, the present invention can be applied to a girder cast in place.

Further, a spiral reinforcing bar can be provided on the outer periphery of the anchor cap 10.

The dimensions and the like of the above-mentioned constituent members can be set to dimensions and the like suitable for carrying out the present invention.

The anchor bar 20 is used for a corrosion-resistant movable anchor type bridge prevention device A for so-called Plenten Hollow. Can be used. In such a case, the diameter of the anchor bar may be increased, and the cushioning material may have a suitable thickness.

Further, the anchor cap can be fixed to the anchor bar. For example, a bolt hole is opened at the top of the anchor cap, a screw is cut at the top of the cushioning material or the cushioning material and the anchor bar, and a bolt is inserted through the bolt hole, and the buffering material or the cushioning material and the screw hole of the anchor bar are screwed. It can be fixed by a method suitable for practicing the present invention, such as a method of screwing it into the device. In the above figure, the same components are denoted by the same reference numerals.

[0047]

Since the present invention is configured as described above, the following effects can be obtained. Since the number of components is small, the manufacturing cost can be reduced and the assembling time can be shortened. In addition, it is possible to meet the new seismic standards simply by increasing the thickness of the cushioning material.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a corrosion-resistant movable anchor-type bridge prevention device according to the present embodiment is installed.

FIG. 2 is a longitudinal sectional view of an anchor cap.

FIG. 3 is a sectional view taken along the line aa in FIG. 2;

FIG. 4 is a sectional view taken along line bb of FIG. 2;

FIG. 5 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

FIG. 6 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

FIG. 7 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

FIG. 8 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

FIG. 9 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

FIG. 10 is a process diagram using a corrosion-resistant movable anchor type fall prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Corrosion-proof movable anchor type fall prevention device M Non-shrink mortar C Fill concrete S PC slab 1 PC girder 2 Band-shaped rubber bearing 3 Abutment 4 Preparatory hole 10 Anchor cap 20 Anchor bar 21, 25 Buffer material 21a Step part 30 Sponge material

Claims (8)

(57) [Claims] 1. An abutment at a required interval in a direction perpendicular to the bridge axis.
An anchor bar, which is located in a gap between a plurality of PC girders installed on a pier or the like and whose lower part is fixed to an abutment, etc., An anchor cap embedded in a filling material such as concrete or mortar to be cast.
A corrosion-resistant movable anchor-type bridge prevention device used for fixing a floor slab constructed by a C girder and the filling material to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. Is covered with a cushioning material, the anchor cap has a width whose inner surface is spaced from the outer surface of the anchor bar at least before and after in the bridge axis direction, and the cushioning material is embedded in an abutment or the like from its tip. , The size of the portion embedded in the abutment or the like is smaller than the size of the portion existing in the anchor cap, and at the position where the size changes, the lower end surface of the anchor cap is formed. An anticorrosion movable anchor type fall prevention device having a step portion flush with the surface. 2. An abutment at a required interval in a direction perpendicular to the bridge axis.
An anchor bar, which is located in a gap between a plurality of PC girders installed on a pier or the like and whose lower part is fixed to an abutment, etc., An anchor cap embedded in a filling material such as concrete or mortar to be cast.
A corrosion-resistant movable anchor-type bridge prevention device used for fixing a floor slab constructed by a C girder and the filling material to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. Is covered with a cushioning material in the shape of a prism having an outer contour.The anchor cap has a width whose inner surface is spaced from the outer surface of the anchor bar at least in the front-back direction in the bridge axis direction. It is formed so as to reach a portion buried in an abutment or the like, and a dimension of a portion buried in an abutment or the like is smaller than a size of a portion existing in the anchor cap. A corrosion-resistant movable anchor type fall prevention device having a step portion flush with a lower end surface of a cap. 3. An abutment at a required interval in a direction perpendicular to the bridge axis.
An anchor bar, which is located in a gap between a plurality of PC girders installed on a pier or the like and whose lower part is fixed to an abutment, etc., An anchor cap embedded in a filling material such as concrete or mortar to be cast.
A corrosion-resistant movable anchor-type bridge prevention device used for fixing a floor slab constructed by a C girder and the filling material to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. Is covered with a cushioning material.The anchor cap has a width whose inner surface is spaced apart from the outer surface of the anchor bar at least in the front-back direction in the bridge axis direction. A corrosion-resistant movable anchor-type bridge prevention device, wherein a fall-off prevention member is provided so as not to fall off from the anchor cap and to be deformable with movement of the anchor cap. 4. An abutment at a required interval in a direction perpendicular to the bridge axis.
An anchor bar, which is located in a gap between a plurality of PC girders installed on a pier or the like and whose lower part is fixed to an abutment, etc., An anchor cap embedded in a filling material such as concrete or mortar to be cast.
A corrosion-resistant movable anchor-type bridge prevention device used for fixing a floor slab constructed by a C girder and the filling material to an abutment or the like, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap. The outer surface of the anchor cap is covered with a cushioning material in a prismatic shape, and the inner surface of the anchor cap has a width spaced at least in the front-back direction in the bridge axis direction with the outer surface of the anchor bar. A corrosion-resistant movable anchor-type bridge prevention device, wherein the anchor bar is prevented from falling off from the anchor cap, and a falling-off prevention member which is deformable with movement of the anchor cap is provided. 5. An inner lower end of the anchor cap,
The anticorrosion movable anchor type drop bridge according to claim 1 or 2, wherein the anchor bar is prevented from falling off from the anchor cap, and a fall-off prevention member that is deformable with movement of the anchor cap is provided. Prevention device. 6. An anticorrosive movable unit for fixing a floor slab to an abutment or the like, comprising: an anchor bar having a lower portion fixed to an abutment or the like; and an anchor cap covering the upper portion of the anchor bar and being embedded in concrete, mortar or the like. An anchor bar used in an anchor-type bridge prevention device, wherein the anchor bar has at least a portion of its outer periphery existing in the anchor cap covered with a cushioning material, and the cushioning material is embedded in an abutment or the like from its tip. , The size of the portion embedded in the abutment or the like is smaller than the size of the portion existing in the anchor cap, and at the position where the size changes, the lower end surface of the anchor cap is formed. An anchor bar having a step portion which is flush. 7. An anchor bar used in an anticorrosion movable anchor type fall prevention device for fixing a floor slab to an abutment or the like, wherein at least a portion of the outer periphery of the anchor bar which is present in the anchor cap is covered with a cushioning material. The cushioning material is covered in the shape of a contour prism, the cushioning material extends from the tip to a portion buried in the abutment, etc., and the dimension of the portion buried in the abutment is smaller than the size of the portion existing in the anchor cap. An anchor bar, which is formed so as to have a stepped portion at a position where the dimension changes, and which is flush with a lower end surface of the anchor cap. 8. The anchor bar according to claim 6, wherein the anchor bar has a square cross section.