JP2001098513A - Steel form and method for forming bridge drop preventing block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel form for forming a bridge drop preventing block capable of being easily arranged around the reinforcing bars for a concrete block and capable of being sized accurately. SOLUTION: Four corner portions forming the corner sections of the side walls of a form are provided, and the corner portions have first portions and second portions at prescribed angles respectively. First connecting portions for connecting the adjacent first portions of each corner portion and second connecting portions for connecting the adjacent second portions of each corner portion are provided, a plurality of holes or oblong holes are formed at intervals in the vertical direction of the end sections of the first and second portions, and a plurality of oblong holes or holes are formed at positions corresponding to the end sections of the first and second connecting portions. The end sections of the first portions of the corner portions are overlapped on the end sections of the first connecting portions, the end sections of the second portions of the corner portions are overlapped on the end sections of the second connecting portions, and the side lengths of the form can be adjusted by inserting and fastening bolts into the holes and oblong holes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel formwork for forming a bridge prevention block and a method for forming the bridge prevention block using the formwork.

[0002]

2. Description of the Related Art In general, a bridge is provided with a fall prevention system so as to prevent a fall of a bridge superstructure even when an unexpected structural failure occurs due to a structural member or ground failure. . There are various known bridge drop prevention systems, such as a system for connecting an abutment and a bridge girder with a PC steel bar, and a system for providing a protrusion on the abutment to prevent the bridge girder from falling. FIG. 8 shows one type of a system in which a protrusion is provided on an abutment to prevent the bridge girder from falling.

In the type shown in FIG. 8, a concrete block is provided on an abutment to prevent the bridge girder from falling. This concrete block is formed by first forming an abutment, extending a reinforcing bar for the concrete block from the abutment, forming a form around the reinforcing bar, and then pouring concrete into the form. Note that a cushioning material is attached to a side surface of the concrete block in order to buffer a collision between the concrete block and the bridge girder during an earthquake or the like.

[0004]

However, since there is a bridge girder reinforcement around the place where the concrete block is to be formed, there is not enough space, and the work of forming a form around the reinforcing bar is not possible. There has been a problem that it is very difficult and it is not easy to form a precisely dimensioned formwork.

Accordingly, the present invention provides a steel form for forming a bridge preventing block and a method for forming the bridge preventing block which can be easily arranged around the reinforcing bar for the concrete block and can be accurately dimensioned. It is to be.

[0006]

The steel formwork for forming a fall prevention block according to claim 1 of the present application has four corner portions constituting corner portions of a side wall of the formwork, and each corner portion is provided. Has a plate-shaped first portion and a second portion at a predetermined angle with respect to each other, and a plurality of holes are formed at vertically spaced locations at the ends of the first portion. A plurality of elongated holes are formed at corresponding portions of the end of the second portion, and the end of the first portion of the corner portion is overlapped with the end of the second portion of the adjacent corner portion. It is characterized in that the side length of the mold can be adjusted by tightening a bolt through the hole and the elongated hole.

[0007] The steel formwork for forming a bridge preventing block according to a second aspect of the present invention has four corner portions forming corner portions of a side wall of the formwork, and each corner portion has a predetermined angle with each other. A first plate-shaped connecting portion for connecting the adjacent first portions of the corner portions, the first connecting portion having a plate-shaped first portion and a second portion; A plate-shaped second connecting portion for connecting the adjacent second portions of the corner portions,
A plurality of holes or slots are formed at vertically spaced locations at the ends of the first and second portions, and a plurality of slots at corresponding locations at the ends of the first and second coupling portions. Or a hole is formed, the end of the first portion of the corner portion and the end of the first connection portion are overlapped, and the end of the second portion of the corner portion and the end of the second connection portion are overlapped. It is characterized in that it is configured such that the side length of the formwork can be adjusted by overlapping the parts with each other and tightening a bolt through the hole and the elongated hole.

According to a third aspect of the present invention, there is provided a steel formwork for forming a bridge preventing block according to the first or second aspect.
Fixing means for fixing the formwork to the reinforcing bar is provided on the inner surface of the corner portion and / or the connecting portion, and the fixing means includes:
A pipe member attached to the inner surface of the corner portion and / or the connecting portion so as to extend in a vertical direction, and one portion has a substantially L-shaped round bar member inserted into the pipe member. It is assumed that.

According to a fourth aspect of the present invention, there is provided a method for forming a falling bridge prevention block, comprising the steps of: preparing a steel formwork configured to be able to adjust the side length; and forming a steel form around a reinforcing bar extending from the abutment. A step of placing the form, adjusting the side length of the form according to the size of the block to be formed, fixing the form and the rebar so that the form does not move, And a step of placing concrete.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a steel formwork for forming a bridge preventing block according to a preferred embodiment of the present invention. A steel formwork for forming a fall prevention block generally indicated by reference numeral 10 in FIG. 1 has a substantially rectangular shape in plan view, and has upper and lower surfaces open.

[0011] The steel formwork 10 for forming a fall prevention block is
There are four corner portions 12 forming corner portions of the side wall. Each of the corner portions 12 has a substantially L-shape in plan view. In the illustrated embodiment, each corner portion 12 has a plate-shaped first portion (long side portion) 12a and a plate-shaped second portion (short side portion) as shown in FIG. 1
2b are joined together by welding or the like, but the first portion 12a and the second portion 12b are formed.
May be integrally formed.

Each corner portion 12 is preferably provided to increase the rigidity of the steel formwork 10 for forming a bridge-preventing block.
Ribs 12c are attached to the upper and lower edges.

As will be described in detail later, the steel formwork 10 for forming a bridge-preventing block also has a plate-like first connecting portion for connecting adjacent long side portions 12a of each corner portion 12. 14 and adjacent short side portions 12 of each corner portion 12
and a plate-shaped second connecting portion 16 for connecting the members b to each other. The first connecting portion 14 and the second connecting portion 16 are formed of a steel plate having substantially the same height as the corner portion 12.

As shown in FIGS. 2 and 3, an end of a long side portion 12a and a short side portion 12b of each corner portion 12 are formed.
Are provided with a plurality of (three in the figure) holes 18 at locations spaced apart in the vertical direction. On the other hand, holes 18 are also provided at the ends of the first connecting portion 14 and the second connecting portion 16.
An elongated hole (slot) 20 is provided at a height corresponding to. The corner portion 12 and the first and second connection portions 14 and 16 are connected by overlapping the hole 18 and the long hole 20 and fastening them with bolts 22. At this time, the elongated holes 20 are formed in the connecting portions 14 and 16.
Is provided, it is possible to adjust the length in the long side direction and the length in the short side direction of the steel formwork 10 for forming a fall prevention block.

The corner portions 12 and / or the connecting portions 14, 1
A fixing means 24 for fixing the steel formwork 10 for forming a bridge preventing block to a reinforcing bar is provided on the inner surface of 6.
In the embodiment shown, the fixing means 24 is
As best shown in FIG. 1, a pipe member 24a is attached to the inner surface of the corner portion 12 and / or the connecting portion 14, 16 so as to extend vertically by welding or the like, and has a substantially L-shape when viewed from the side. And a round bar member 24b. Then, at the time of use, one part of the round bar member 24b is inserted into the pipe member 24a, and the other part is tied to a reinforcing bar using a bangsen or the like, so that the steel formwork 10 for forming a bridge for preventing falling bridge, Is fixed. Although FIG. 1 shows ten pipe members 24a, a state in which the round bar member 24b is inserted into only one of the pipe members 24a is shown.

Preferably, as best shown in FIG. 6, a seal 26 is attached to each corner portion 12 and the lower edge of the connecting portions 14,16. As the sealing material 26, a known sealing material such as a polyurethane foam may be used. The sealing material 26 plays a role in adjusting the gap at the bottom of the steel formwork 10 for forming a bridge-preventing block.

Preferably, as shown best in FIG. 6, a waterproof material 28 is attached to the inner surface adjacent each corner 12 and the upper edge of the connecting portions 14,16. As the water stopping material 28, a known water stopping material such as a butyl rubber-based water stopping material may be used. It is conceivable that the concrete shrinks after the hardening of the concrete, a gap is generated between the formwork 10 and the concrete, and water is immersed from the gap. Fulfill.

Further, preferably, a cushioning material 30 made of rubber or the like is attached to the outer surfaces of the corner portions 12 and the connecting portions 14 and 16 in order to buffer a collision between the block and the bridge girder during an earthquake or the like. Have been. Cushioning material 3
0 is attached by bolts (not shown) or the like. In FIG. 1, the cushioning material 30 is provided only on the upper side and the right side of the formwork 10.
Are shown, but the cushioning material 3 is also provided on the lower side and the left side of the formwork 10.
0 can be attached.

Next, a method of forming a bridge prevention block using the steel formwork 10 for forming a bridge prevention block formed as described above will be described with reference to FIG. FIG.
(A) shows a state in which a reinforcing bar for a concrete block extends from an abutment. First, as shown in FIG. 7B, the mold 10 is placed around the reinforcing bar. Then, according to the dimensions of the concrete block to be formed, adjust the length of the long side direction and the short side direction of the formwork,
When the required length is obtained, the bolt 22 is tightened to secure the corner portion 12 and the connecting portions 14, 16 so as not to move with respect to each other. At the same time, the fixing means 24 and the rebar are tied up by bunsen, welding, or the like so that the mold 10 does not move from a predetermined position. Next, as shown in FIG. 7 (c), concrete is poured into the formwork 10, and when the concrete hardens, the fall prevention block is completed.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in.

For example, in the above embodiment, the long side portion 12a and the short side portion 12b of the corner portion 12 are formed so as to form a right angle. However, depending on the situation of the block to be formed (for example, In the case of a diagonal bridge, a parallelogram block is required in plan view), and the angle between the long side portion 12a and the short side portion 12b may be an arbitrary angle. In the above embodiment, the long side portion 12a is formed to be longer than the short side portion 12b. However, depending on the situation (for example, a square If necessary), the length of the long side portion 12a and the length of the short side portion 12b may be the same.

In the above embodiment, the hole 18 is formed at the corner and the elongated hole 20 is formed at the connecting portions 14 and 16. However, the elongated hole is formed at the corner and the connecting portion is formed. Holes may be formed. Further, in the above embodiment, the corner portion is configured to be slidable with respect to the connection portion, but the connection portion is omitted, and a hole is formed in a certain corner portion,
An elongated hole may be formed in an adjacent corner portion and bolted to form a hole so that one corner portion slides with respect to the other corner portion.

[0023]

According to the present invention, it is possible to easily arrange a concrete block even in a place where there is not enough space to form a concrete block, and to obtain a formwork and a block forming method having excellent workability. Further, a method for forming a mold and a block, which can be accurately dimensioned even by a non-expert, is obtained. In addition, since the installation time can be shortened as compared with the conventional mold installation work, the construction period is shortened. Furthermore, as a secondary effect, since the concrete block has a structure wound by a steel formwork, the toughness and proof stress of the concrete block are improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a steel formwork for forming a bridge prevention block according to a preferred embodiment of the present invention.

FIG. 2 is a front view taken along line 2-2 of FIG. 1;

FIG. 3 is a side view along the line 3-3 in FIG. 1;

FIG. 4 is an enlarged view of a part 4 of FIG. 1;

FIG. 5 is a view along the line 5-5 in FIG. 1;

FIG. 6 is a sectional view taken along lines 6-6 in FIG. 1;

FIG. 7 is a view showing a method of forming a concrete block using the formwork of the present invention.

FIG. 8 is a view showing a conventional concrete block for preventing falling bridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel frame for bridge fall prevention block formation 12 Corner part 14, 16 Connection part 18 hole 20 Slot 20 Bolt 24 Fixing means

Claims (4)

[Claims] 1. A steel formwork for forming a fall prevention block, comprising four corner portions forming corner portions of a side wall of the formwork,
Each corner portion has a plate-shaped first portion and a second portion at a predetermined angle with respect to each other, and a plurality of portions are provided at vertically spaced locations at the end of the first portion. A hole is formed, a plurality of slots are formed at corresponding locations at the end of the second portion, and the end of the second portion of the corner portion adjacent to the end of the first portion of the corner portion Characterized by being able to adjust the side length of the formwork by superimposing and tightening bolts through the holes and the elongated holes. 2. A steel formwork for forming a fall prevention block, comprising four corners forming corners of side walls of the formwork,
Each corner portion has a plate-shaped first portion and a second portion at a predetermined angle to each other, and a plate-shaped portion for connecting adjacent first portions of each corner portion. A first connecting portion, and a plate-shaped second connecting portion for connecting adjacent second portions of the corner portions, and a vertical direction of an end of the first and second portions. A plurality of holes or slots are formed at locations spaced apart from each other, and a plurality of slots or holes are formed at corresponding locations at the ends of the first and second connecting portions. The end of the part and the end of the first connecting part are overlapped, the end of the second part of the corner part and the end of the second connecting part are overlapped, and a bolt is passed through the hole and the slot. A formwork characterized in that the side length of the formwork can be adjusted by tightening. 3. An inner surface of the corner portion and / or the connecting portion,
A fixing means for fixing the formwork to the reinforcing bar is provided, the fixing means is a pipe member attached so as to extend in a direction perpendicular to the inner surface of the corner portion and / or the connecting portion, and one portion is a pipe member. The mold according to claim 1, further comprising a substantially L-shaped round bar member inserted into the member. 4. A method for forming a fall prevention block, comprising the steps of: providing a steel formwork configured to be adjustable in side length; and providing steel around a rebar extending from the abutment. A step of placing a formwork, a step of adjusting the side length of the form according to the size of a block to be formed, a step of fixing the formwork and a reinforcing bar so that the formwork does not move, Casting concrete on the floor.