JP3691753B2 - Bridge girder edge processing method and structure, and buried form for bridge girder stopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing method and a processing structure of a bridge girder end portion excellent in on-site workability, and a buried form for a bridge girder stopper.
[0002]
[Prior art]
The support structure that supports both ends of the bridge girder has a structure in which a plurality of square holes are formed, and stoppers made of large square steel are inserted into the holes to lock the both ends of the bridge girder. Yes.
As a conventional construction method, a method is known in which concrete is cast in a state in which foamed polystyrene molded into a prismatic shape is embedded, and then the foamed polystyrene is removed from the concrete.
In addition, as another construction method, a method is also known in which a wooden formwork is prepared in advance, concrete is placed with this formwork installed, and then the wooden formwork is removed from the concrete. .
[0003]
[Problems to be solved by the invention]
However, in the construction method using the above-mentioned expanded polystyrene, it is difficult to install a lightweight expanded polystyrene molded body in a predetermined position, and further, the operation of dissolving this expanded polystyrene in an organic solvent and removing it is extremely troublesome. There were also problems such as air pollution, and the working environment was significantly deteriorated.
In addition, even with the construction method using the wooden formwork, the installation position is not sufficiently secured, and it is difficult to remove completely due to partial peeling or breakage during removal. Note that it is impossible to use the wooden formwork as an embedded formwork without removing it due to problems such as corruption and insufficient strength. For example, after the stopper is inserted, the graft is injected and fixed, but it is known that a buoyancy of about 1.2 tons per piece acts even if there are about four places per one end of the bridge girder. Since the wooden formwork cannot withstand such a great stress, it cannot be used as an embedded formwork.
Then, this invention aims at proposing the processing method and processing structure of a bridge girder edge part which is excellent in site construction property, and does not deteriorate a working environment.
[0004]
[Means for Solving the Problems]
The present invention has been proposed in view of the above, and a concrete embedding formwork in which the upper surface is open and the bottom surface is closed is arranged at predetermined positions on both ends where the bridge girder is placed, and concrete is cast around the periphery. The bridge girder is constructed by installing a support structure, placing the bridge girder on the support structure, inserting a stopper from the open upper surface of the embedded formwork, and injecting and fixing grout into the gap. The present invention relates to an edge processing method.
[0005]
Further, according to the present invention, both ends of the bridge girder are supported by a supporting structure in which a concrete embedding form made of concrete with an open upper surface and a closed bottom surface is integrally embedded, and locks the ends of the bridge girder. The stopper also proposes a treatment structure for the end portion of the bridge girder characterized by being inserted from the open upper surface of the embedded formwork and fixed by a grout.
[0006]
Furthermore, the present invention also proposes a bridge girder stopper embedded form used in the processing method and processing structure described above, and the upper surface into which the stopper for locking the end of the bridge girder is inserted by a plurality of concrete plates. It is characterized by being assembled in a box shape that opens and closes the bottom surface. In addition, although the embedded formwork used for the processing method and processing structure of the said bridge girder edge part may be an integrally molded body (form), in the following description, it demonstrates as the thing of the structure which consists of a some concrete board.
[0007]
The concrete plate constituting the embedded form in the present invention is not particularly limited in its material configuration and shape configuration, and can be appropriately selected by setting strength characteristics, thickness, etc. according to the application. For example, grout is injected on the inner surface side of the embedded form as a product, and concrete is cast on the outer surface side thereof. It is desirable to increase the adhesion strength with grout or concrete. In addition, when a structure is provided with an aggregate or a sprinkled concrete layer (concave / convex layer) on one or both sides of a concrete plate, the surface area becomes large and high adhesive strength is obtained in the same manner as when the concavo-convex treatment is applied. Can do.
[0008]
In addition, as mentioned above, the buoyancy force of approximately 1.2 tons acts on the embedded form for the bridge girder stopper. Therefore, a fixing bracket is embedded inside the side concrete plate constituting the embedded form. It is desirable to fix the bracket to the surrounding steel material with anchor bolts.
[0009]
Further, fiber reinforced concrete (hereinafter referred to as FRC) may be used as the concrete plate. This FRC is a thin-walled concrete reinforced with short fibers. Since general concrete is reinforced with reinforcing bars, there is also a problem of corrosion due to insufficient cover. Therefore, high strength and high toughness FRC can be reduced in thickness (weight reduction), and is extremely preferable not only in a mode in which a plurality of concrete plates are combined, but also in an embedded formwork as an integrally formed body (foam). Alternatively, resin concrete may be used as the concrete plate.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments of the drawings.
[0011]
The embedded form 1 of the illustrated embodiment shown in FIGS. 1 to 5 is composed of five FRC plates each having a predetermined dimension, and more specifically, one bottom plate 2 and four vertically long side plates. There are two types of four side plates, consisting of two sheets with narrow width (3A) in the middle of the height and two sheets with wide width (3B) in the middle of the height.
Inside these side plates 3A and 3B, a plurality of fixing metal fittings 4 into which anchor bolts to be described later are inserted are embedded at predetermined positions. The fixing bracket 4 includes a female screw portion in the thickness direction and a locking portion extending in the width direction in the illustrated embodiment, but is not particularly limited thereto, and may have any configuration.
Further, the side plate 3A is formed so that its middle part in the height is wide to the left and right by the thickness, and the middle part of the side plate 3B is narrowed to the left and right by the thickness.
Further, each of the plates 2, 3 </ b> A, 3 </ b> B has the same thickness (39 mm), and on each inner surface side, a concavo-convex treatment 5 having a thickness of 4 mm obtained by transferring the concavo-convex of the air cap sheet is applied. This unevenness treatment 5 is easily imparted with an uneven shape when concrete is placed in a state where an air cap sheet is arranged in the mold (bottom surface) during molding of the respective plates 2, 3 </ b> A, 3 </ b> B.
Further, on the outer surface side of each of the plates 2, 3A, 3B, an uneven layer 6 having a thickness of 6 mm to which aggregate or sprinkled concrete is attached is formed. The uneven layer 6 may be attached and formed after the plates 2, 3A, 3B are combined.
[0012]
When the side plate 3A and the side plate 3B having the above-mentioned configuration are combined so as to be orthogonally adjacent to each other, the side plates 3B are combined in a state where the middle of the side plate 3A is fitted in the middle of the side plate 3B, thereby forming a rectangular tubular side surface portion. The The side plates 3A and 3A, and the side plates 3B and 3B are disposed in an opposing manner in the side surface portion of the square cylindrical shape.
Moreover, since the step part 7 is formed in the baseplate 2 which receives the lower end of this square cylindrical side part, the shift | offset | difference movement of front and rear, right and left is prevented.
An adhesive made of an epoxy resin or the like is used for joining (adhesion) of the respective plates, but is not particularly limited thereto.
In the illustrated embodiment, an L-shaped temporary fixing bracket (not shown) is attached to the fixing bracket 4 to assemble while reinforcing the stability at the time of assembly.
[0013]
A method for fixing the end portion of the bridge girder using the embedded form 1 thus assembled, that is, a method for processing the end portion of the bridge girder will be described below.
[0014]
First, the embedded form 1 is disposed at predetermined positions on both ends where the bridge girder 8 is placed.
At this time, since a plurality of fixing brackets 4 are embedded in the side plates (side concrete plates) 3A and 3B of the embedded mold 1 as described above, one end of the anchor bolt 9 is attached to the fixing bracket 4. While inserting and fixing, the other end of this anchor bolt 9 is fixed to the steel plate 10 arrange | positioned around. Thereby, the embedded metal fitting 1 is disposed and fixed at a predetermined position.
[0015]
Next, the concrete 11 is cast around the disposed embedded form 1 to construct the support structure 12.
At that time, since the uneven surface layer 6 having a large surface area is provided on the outer surface side of the side plates (side concrete plates) 3A and 3B of the embedded mold 1 as described above, the placed concrete 11 is deeply formed in the uneven surface layer 6. The contact area is increased by entering and high adhesive strength can be obtained.
[0016]
The bridge girder 8 is placed on the upper surface of the support structure 12 formed in this way, and the stopper 13 is inserted from the open upper surface of the embedded mold 1, and the grout 14 is injected and fixed in the gap.
At that time, as described above, the grooving treatment 5 is applied to the inner surfaces of the side plates (side concrete plates) 3A and 3B and the bottom plate 2 of the embedded mold 1, so that the injected grout 14 is subjected to the concavo-convex treatment (surface). 5 can be penetrated deeply to increase the contact area and obtain high adhesive strength.
The bridge girder 8 and the stopper 13 are not limited in any way, and any known configuration can be applied. In the illustrated embodiment, one end portion is a fixed side using a large-diameter stopper 13, and the other end portion is a movable side using a stopper 13 having a smaller diameter. However, it is not limited at all, and any known construction method can be applied (combined).
[0017]
Thus, the processing method of the edge part of a bridge girder of this invention is excellent in field workability, and the processing structure obtained by it is very robust. In particular, when FRC is used as the embedded form, the embedded form itself is highly durable, but a more robust processing structure can be obtained. Furthermore, by fixing the fixing bracket inside the side concrete plate that constitutes the embedded formwork and fixing it to the surrounding steel plate with anchor bolts, it can be easily placed at a predetermined position, and 1.2 tons. Even if buoyancy is applied, it is highly durable and will not be damaged.
Therefore, the embedded form for the bridge girder stopper of the present invention, and the method and structure for treating the end of the bridge girder using the same can be applied to the ends of various bridge girders. For example, the bridge girder disposed on land is Of course, it can be suitably used for large bridge girders that cross rivers and straits.
[0018]
Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be carried out in any way as long as the configuration described in the claims is not changed.
[0019]
【The invention's effect】
As described above, the method for treating the end portion of the bridge girder of the present invention uses a concrete embedded formwork, so that it does not go through a troublesome process as in the conventional processing method, and is excellent in on-site workability. It is a thing. Moreover, it is possible to easily dispose at a predetermined position by embedding a fixing metal fitting inside a side concrete plate constituting the embedded formwork and fixing it to a surrounding steel plate with an anchor bolt.
[0020]
Further, the processing structure of the obtained bridge girder end portion of the present invention is extremely robust even when vibrations and stress acting on the bridge girder are transmitted, and particularly when the FRC is used as the embedded mold, the embedded mold itself is high. Not only will it be durable, it will result in a more robust processing structure. In addition, fixing metal fittings are embedded in the side concrete plates that make up the embedded formwork, and fixed to the surrounding steel plates with anchor bolts, damage or the like may occur even if buoyancy of 1.2 tons is applied. There will be no high durability. Therefore, it can be suitably used for various bridge girders, particularly large bridge girders across the strait.
[0021]
Furthermore, the embedded form for the bridge girder stopper of the present invention is formed by combining a concrete plate with a simple structure, and can be easily applied to the above-described processing method and processing structure.
[Brief description of the drawings]
1A is a perspective view showing an embodiment of an embedded mold according to the present invention, and FIG. 1B is an exploded perspective view thereof.
2 is a plan view of the embedded form of FIG. 1. FIG.
3A is a plan view of one side plate (side concrete plate) constituting the embedded form of FIG. 1, FIG. 3B is a front view thereof, and FIG. 3C is a side view thereof.
4A is a plan view of the other side plate (side concrete plate) constituting the embedded form of FIG. 1, FIG. 4B is a front view thereof, and FIG. 4C is a side view thereof.
5A is a front view of a bottom plate (bottom concrete plate) constituting the embedded formwork of FIG. 1, and FIG. 5B is a plan view thereof.
FIG. 6 is a side sectional view showing a processing structure of the present invention.
[Explanation of symbols]
1 buried mold 2 bottom plate 3A, 3B side plate (side concrete plate)
4 Fixing bracket 5 Uneven surface treatment (surface)
6 Uneven layer 8 Bridge girder 9 Anchor bolt 10 Steel plate 11 Concrete 12 Support structure 13 Stopper 14 Grout

Claims (6)

The concrete which constitutes the side of the embedded formwork which arranged the embedded formwork made of concrete with the upper surface open and the bottom face closed at the predetermined position of both ends where the bridge girder is placed, and which has been subjected to uneven treatment on one or both sides Fix the fixing bracket embedded in the interior of the steel to the surrounding steel with anchor bolts , cast concrete around it, construct the support structure, insert the stopper from the open upper surface of the embedded formwork , A method for treating a bridge girder end, wherein the bridge girder is placed on a support structure so that the portion is locked by a stopper, and grout is poured into the gap and fixed.   The method for treating a bridge girder end according to claim 1, wherein the embedded form is made of fiber reinforced concrete.   2. The method for treating a bridge girder end according to claim 1, wherein the embedded form is made of resin concrete.   The processing method of the edge part of a bridge girder as described in any one of Claims 1-3, wherein an embedded formwork combines a plurality of concrete boards. Both ends of the bridge girder are preliminarily placed in the concrete constituting the side of the embedded formwork in which a concrete embedded formwork whose upper surface is open and whose bottom face is closed is integrally embedded, and one or both sides are subjected to unevenness treatment. The stopper for locking the end of the bridge girder is fixed from the open upper surface of the embedded formwork by fixing the embedded fixing bracket to the surrounding steel material with anchor bolts and being supported by the supporting structure with concrete cast around it. Bridge girder edge processing structure, characterized by being inserted and fixed with grout. It is assembled into a box shape in which the top surface inserted by the stopper that locks the bridge girder end is opened and the bottom surface is closed by a plurality of concrete plates with one or both sides processed with unevenness, inside the concrete constituting the side surface An embedded formwork for a bridge girder stopper, characterized in that a fixing metal fitting fixed to the surrounding steel material by an anchor bolt is embedded.

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