JPH0358403B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to a deck for reducing added stress caused by uneven settlement of supporting girders of deck slabs of bridge structures. Concerning a method for joining plates together.

(Prior Art and Background) In a bridge structure, the deck slab is the part on which the load is most severely applied, and is often damaged. There are various causes of deck slab failure, but one of them is thought to be the accumulation of additional stress due to fulcrum settlement, that is, the deflection of the support girders that support the deck slab. In addition, RC floor slabs are continuous slabs that are made up of a combination of many vertical and horizontal girders, and the slabs that support these slabs often deteriorate over time. Particularly when exposed to the influence of sea breeze, or when exposed to the influence of salt calcification as a means of removing accumulated snow, the flanges and belly plates of the floor assemblies become thinner and the girder rigidity deteriorates significantly. When there is a difference in the rigidity of each member of the floor assembly, the deck slab fulcrums undergo various uneven settlements, and as a result, bending stress due to loading and additional stress due to the fulcrum settlement act on the slab, promoting deck damage. .

In addition, if an example of the behavior of the floor slab due to loading is shown in Figures 5 and 6, the floor slab will be twisted as shown by the dotted line in Figure 1,
The vertical movement is shown as shown by the dotted line in Figure 6. Here, 1 indicates the floor slab and 2 indicates the girder.

The present inventors previously controlled this behavior by changing the elastic body, and in order to alleviate the cause of deck failure, the deck slab and support girder were fastened together using elastic bodies such as leaf springs. The invention was published in 1983, regarding a method for joining floor slabs and girders that are tightened using fasteners such as bolts.
It was announced in Publication No. 42125.

This method involves finding a fixing point for fixing a resilient body such as a leaf spring at an arbitrary point on a stiffener of a certain size located on the floor slab, and then tightening the middle part of the resilient body with a bolt such as a bolt. Fix it using fasteners, find an elastic fulcrum on the girder and deck, receive the fulcrum at the end of the elastic, and use the elastic force of the elastic to fasten the girder and deck. It consists of a structure.

(Problem to be solved by the invention) This idea is based on the idea that when a part where stress concentration or additional stress is likely to occur is fastened with a constant tightening force through an elastic body, the deformation of the elastic body will buffer this. As a result, the accumulation of stress can be reduced and floor slab damage can be prevented.
In this configuration, the girder and the deck slab or only the girder and the resilient body are fastened only in the vertical direction, and no consideration has been given to controlling the movement of the deck slab in the horizontal direction.

The present invention further develops the above-mentioned invention to provide a method for joining a floor slab and a support girder, which makes it possible to control not only the vertical movement of the floor slab, but also the horizontal movement. be.

[Structure of the invention]

(Means for Solving the Problems) The present invention has a configuration that requires a fixing point on the bottom surface of the floor slab for fixing a folded elastic body to the bottom surface of the floor slab, and places the elastic body at this fixing point. is fixed using washers of unequal thickness and fasteners, and the fulcrum of the elastic body is set on the end face of the flange of the girder and the lower face of the flange of the girder, and the fulcrum set on the end face of the flange is received by one end of the elastic body, and the flange By adopting a method of joining the deck slab and the support girder, which is characterized in that the fulcrum set on the lower surface is supported by the other end of the elastic body, and the girder and the deck slab are fastened together using the elastic force of the resilient body. In addition, a fixing point for fixing the folded elastic body to the bottom surface of the floor slab is found on the bottom surface of the floor slab, and the elastic body is fixed to this fixing point by sandwiching washers of unequal thickness and using fasteners. At the same time, it is fixed to a movable restraint body that has a recess formed in the end face of the flange of the girder, and the fulcrum of the elastic body is set in the concave part of the movable restraint body and the lower surface of the flange of the girder, and the fulcrum that defines the concave part of the movable restraint body is elastically fixed. A joint between a deck slab and a girder, characterized in that it is supported at one end of the body, a fulcrum set on the lower surface is received at the other end of the elastic body, and the girder and the deck are connected using the elastic force of the elastic body. This method solves the above problems.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 and FIG. 2 are explanatory diagrams of the first invention, and both show the present invention applied to an RC floor slab.
1 is a floor slab, 2 is a girder, 5 is an elastic body, and 7 is a washer of unequal thickness.

As is well known, the floor slab 1 has an unevenness adjustment layer 4 between the lower surface of the haunch 3 of the floor slab 1 and the upper surface of the flange 2a of the girder 2.
It is located in digit 2.

The elastic body 5 is made of a leaf spring or the like and is formed into a folded shape that is a modified U-shape.

The elastic body 5 has one end 5a attached to the end surface of the flange 2a of the girder 2, the other end 5a to the end surface of the flange 2a of the girder 2, and the other end 5b attached to the flange 2a of the girder 2.
The elastic body 5 is received on the lower surface as a fulcrum, and the middle of the folded shape is connected to the fastening bolt 6.
It is fastened with a constant tightening force to the corbel 3, which is the lower surface of the floor slab, by inserting fasteners such as the above.

Specifically, in FIG. 1, a washer 7 of unequal thickness is interposed between the lower surface of the corbel 3 and the elastic body 5.
As is well known, at least one surface of the unequal thickness washer is formed in an inclined shape. Here, the unequal thickness washer 7 is positioned on the lower surface side of the corbel, with the horizontal surface of the unequal thickness washer 7 facing the lower surface of the corbel, and the inclined surface facing the girder 2 and toward the elastic body 5. A normal washer 8 is interposed on the bolt head 6a side of the fastening bolt 6 as necessary. In this embodiment, the other end of the fastening bolt 6 is fastened to a notch 11 in the floor slab 1 using a nut 10 and a washer 9 by a known method.

FIG. 2 shows an embodiment in which the shape of the elastic body 5 and the position of the unequal thickness washer 7 are different from those in FIG. 1.

Here, the unequal thickness washer 7 is positioned on the bolt head 6a side, and the horizontal surface of the unequal thickness washer 7 is placed on the bolt head 6a.
The inclined surface is directed toward the girder 2 and toward the elastic body 5. The shape of the resilient body 5 is adapted to the inclined surface of the unequal thickness washer 7, and the top and bottom are almost reversed from those shown in FIG. The other structures are almost the same as those shown in FIG.

Note that a shaped body 12 is interposed between one end of the resilient body 5 and the end face of the flange 2a of the girder 2, and this structure also uses the fulcrum defined by the end face of the flange of the girder referred to in the present invention as the fulcrum of the resilient body. It can be said that the structure is supported at one end. That is, the present invention does not prevent the connection between the end of the elastic body and the fulcrum being indirect.

FIG. 3 is an explanatory diagram of the second invention, showing an embodiment in which new structural features are added to the embodiment of the first invention shown in FIG.

Specifically, as shown in FIG. 4, the movement restraint body 13 is formed by an attachment part 13a and a restraint part 13b forming a U-shaped recess in plan view, and the flange 2 of the girder 2
The attachment portion 13a is fitted into the attachment fitting portion of the unevenness adjusting layer 4 near the end face of the
b is attached closely to the end face of the flange 2a of the girder 2. One end of the elastic body 5 is inserted into this recess, and the recess is used as a fulcrum for the one end of the elastic body 5.

The elastic body 5 is made of a leaf spring or the like as shown in FIG.
It is formed in the shape of a folded letter.

This elastic body 5 has one end 5a connected to the girder 2.
The movement restraint body 1 provided on the end face of the flange 2a of
The other end 5b is inserted into the recess of the girder 2, and is received using this recess as a fulcrum.
It is received as a fulcrum on the lower surface of the floor slab, and fasteners such as fastening bolts 6 are inserted through the middle of the folded shape to be fastened to the haunch 3, which is the lower surface of the floor slab, with a constant tightening force.

(Effects) Since the present invention has the above-described configuration, it has the following effects.

First, in the first and second inventions, since the parts where there is a risk of stress concentration or additional stress, that is, the floor slab and the girder, are connected by tightening force through elastic bodies, stress concentration or additional stress is caused. Even if this occurs, vertical movement can be alleviated by deformation of the elastic body.

Moreover, by finding the fulcrums of the elastic body on the end and bottom surfaces of the girder, receiving the ends of the elastic body on the respective fulcrums, and using washers of unequal thickness, stress concentration or additional stress can be prevented. When heated, diagonal stresses are created and horizontal components restrain the girder and control the horizontal movement of the length of the deck.

Furthermore, in the second invention, the movable restraint body is provided, and the concave portion of the movable restraint body is used as the fulcrum of the elastic body defined on the end face of the flange, and the end of the resilient body is positioned here, so that the horizontal direction of the width It also restricts movement.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the first invention;
FIG. 3 is an explanatory diagram showing another embodiment of the first invention, FIG. 3 is an explanatory diagram showing an embodiment of the second invention, and FIG. 4 is an explanatory diagram showing another embodiment of the second invention.
An explanatory diagram planarly showing a movable restraint body used in the invention,
FIGS. 5 and 6 are explanatory diagrams showing the behavior of the deck slab due to loading. In the drawings, 1 is a floor slab, 2 is a girder, 2a is a flange, 3 is a haunch, 4 is an unevenness adjustment layer, 5 is an elastic body, 5a, 5b are the ends of the elastic body, 6 is a bolt, 6
a is a bolt head, 7 is an uneven thickness washer, 8 and 9 are ordinary washers, 10 is a nut, 11 is a notch, 12 is a shaped member, 13 is a movable restraint body, 13a is an attachment part, and 13b is a restraint part. be.

Claims (1)

[Scope of Claims] 1. A fixing point for fixing the folded elastic body to the bottom surface of the floor slab is found on the bottom surface of the floor slab, and the elastic body is attached to this fixing point using washers of unequal thickness and fasteners. Once fixed, the fulcrum of the elastic body is set on the end face of the flange of the girder and the bottom face of the flange of the girder, the fulcrum set on the end face of the flange is supported by one end of the elastic body, and the fulcrum set on the bottom face of the flange is supported on the other side of the elastic body. A method for joining a deck slab and a support girder, characterized in that the girder and the deck slab are connected by receiving at the ends and using the elastic force of an elastic body. 2 Find a fixing point on the bottom surface of the floor slab to fix the folded elastic body on the bottom surface of the floor slab, and fix the elastic body to this fixing point using a fastener with a washer of unequal thickness. A movable restraint body with a recess formed in the end face of the flange of the girder is fixed, a fulcrum of the elastic body is set in the concave part of the movable restraint body and the lower surface of the flange of the girder, and the fulcrum set in the concave part of the movable restraint body is connected to the elastic body. received at one end of the
A method for joining a deck slab and a support girder, characterized in that a fulcrum set on the lower surface is supported by the other end of an elastic body, and the girder and deck slab are connected using the elastic force of the resilient body.