JP2001026909A - Connection structure of floor slab using three- dimensional truss with concrete form in bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of a floor slab using a three- dimensional truss with concrete form in a bridge girder capable of simplifying work and rationalizing construction work. SOLUTION: This connection structure of a floor slab using a three- dimensional truss is constituted in such a way that it consists of at least the three-dimensional truss 3 with concrete form in which a projection 2 such as a stud bolt erected on an upper face of a flange 11 of a steel girder 1 and a concrete form 32 to be arranged on the upper face of the flange 11 are integrally formed in a lower part of a three-dimensional welded reinforcing bar 31 and a U-shaped bar 4 which is pressed into the three-dimensional welded reinforcing bar 31 and is connected therewith and the three-dimensional welded reinforcing bars 31 are integrated by concrete to form the floor slab. Moreover, a support plate may be set on the projection 2 to arrange the three-dimensional truss 3 with the concrete form on it, and the U-shaped bar 4 may be inserted into the three-dimensional welded reinforcing bar 11 for connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a floor slab using a three-dimensional truss with a concrete slab in a bridge girder when constructing a bridge floor having a road width of about two lanes.

[0002]

2. Description of the Related Art As a conventional method of constructing a bridge deck, a wooden formwork for a bridge deck is assembled on a bridge girder at a site, reinforcing bars are laid, and then concrete placement and curing are performed. The wooden formwork was dismantled and removed from to form the bridge floor.

[0003]

However, when the bridge deck is formed, wood is used for the formwork, so that a large number of unnecessary wooden form materials are generated and need to be disposed of. Was occurring. In addition, since the assembling work of the wooden formwork and the reinforcing bar reinforcing work are performed on site, the construction period is affected by the weather, and many workers are required. Furthermore, since the wooden formwork is dismantled and removed after the concrete is placed and cured, it is difficult to shorten the construction period, reduce costs and save labor.

[0004] The present invention is a simple operation, and in order to streamline the construction, the present inventor disclosed in Japanese Patent Application No. 11-169099,
In the case of using a "three-dimensional truss with concrete dumping formwork for civil engineering such as a bridge floor" proposed in Japanese Patent Application No. 11-184463, it is intended to provide a joint structure of a floor slab which can be easily and firmly formed. Aim.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. That is, a protrusion which is erected and fixed on the upper surface of a flange of a steel girder, and disposed on the upper surface of the flange. Inside a three-dimensional truss with a concrete slab, in which a concrete slab laid down to the vicinity of the protrusion is integrally formed at the bottom of the three-dimensional welded reinforcing bar, and a three-dimensional truss with a concrete slab with the concrete slab facing the interposition of the protrusion And a connection U-shaped reinforcing bar arranged so as not to contact the protrusions, and the three-dimensional welded reinforcing bars are integrated with concrete to form a floor slab. Also, a projection having a threaded portion set up on the upper surface of the flange of the steel girder, a support plate set on the projection, and a concrete plate integrally formed at the lower part of the three-dimensional welded reinforcing bar disposed thereon. A plate-shaped space truss and at least a connection U-shaped reinforcing bar arranged so as to be pressed into the three-dimensional welded reinforcing bars facing each other across the protrusion and connected so as not to contact the protrusion,
Further, a structure in which the floor slab with the haunch is formed by integrating the three-dimensional welded reinforcing bars with concrete may be used.

[0006]

FIG. 1 is a diagram showing an embodiment of the present invention, which will be described with reference to this drawing. (1) is a steel girder of a bridge, and an H-beam is used as the steel girder (1).
In addition, it is set so that the flange (11) may come above and below the steel girder (1). Reference numeral (2) denotes a large number of projections mounted on the upper surface of the flange (11) of the steel girder (1) at a predetermined pitch. As the projections (2), it is preferable to use a shaft with a head or a stud bolt. The predetermined pitch is an intermediate position of a U-shaped streak (4) described later (see FIG. 2). When the steel girder (1) is prepared, the projection (2) is welded to the upper surface of the flange (11) of the steel girder (1) in a factory beforehand to be erected. (3) is a three-dimensional truss with a concrete slab in which concrete is sunk into a lower part of a three-dimensional welded reinforcing bar (31) and a concrete slab (32) having a predetermined thickness is integrally formed;
This brings the finished product to the site. At this time, the thickness from the reinforcing bar required for the concrete structure, that is, the distance from the bottom surface to the lower reinforcing bar, should be at least 3 cm. Further, as the three-dimensional truss with a concrete plate (3), a "three-dimensional truss with concrete dumping formwork for civil engineering such as a bridge floor" proposed by the present inventor in Japanese Patent Application No. 11-169099 may be used. (4) is U concrete reinforcement
The U-shaped reinforcement (4) is a U-shaped reinforcement (4) which is bent between the longitudinal truss (3) with a concrete slab in a factory before completion. It is good to insert it so that it can be pulled out. At this time, it is preferable that the U-shaped streak (4) has elasticity and is set with the opening side slightly reduced.

3 to 5 show another embodiment of the present invention, which has a structure in which a slab with a haunch is integrated. This will be described. (1) is a steel girder using an H-beam, and (2) is a flange (1) of the steel girder (1).
1) A projection having a plurality of threaded portions mounted on the upper surface at a predetermined pitch. A stud bolt, a screw rod, or the like is used as the projection (2). The intermediate position of the streak (4) is set (see FIG. 4). (3) is a three-dimensional truss with a concrete slab in which a concrete slab (32) having a predetermined thickness is integrally formed by casting concrete under a three-dimensional welded reinforcing bar (31). Bring to At this time,
The thickness from the reinforcing bar required for the concrete structure, that is, the distance from the bottom surface to the lower reinforcing bar, should be at least 3 cm (see FIGS. 6 and 7). The present inventor has disclosed a three-dimensional truss (3) with a concrete plate as disclosed in Japanese Patent Application No. 11-169099.
It is preferable to use a "space truss with a concrete dumping formwork for civil engineering such as a bridge floor" proposed in Japanese Patent Application No. 11-184463. In addition, a projection (321) which comes into contact with the upper part of the side plate (9) used for concrete casting is attached to the end of the concrete plate (32) of the space truss (3) with a concrete plate.
Is preferably used (see FIGS. 5 and 7).
(4) is a connecting U-shaped reinforcing steel bent in a U-shape, and the U-shaped reinforcing bar (4) is prepared in advance in a factory after the three-dimensional truss with concrete slab (3) is completed. It is good to insert so that it can be pulled out between each longitudinal streak in the longitudinal direction.
At this time, it is preferable that the U-shaped streak (4) has elasticity and is set with the opening side slightly reduced.

[0008] Reference numeral (5) denotes a support plate set on the protrusion (2). The support plate (5) is formed by bending a metal plate to form a U-shape or using an existing steel mold. A hole for inserting the protrusion (2) is formed in the upper surface of the support plate (5). The bent shape and the shape of the mold steel are not limited to U-shape. (6) is a height adjusting nut screwed into the screw portion of the projection (2), and the height adjusting nut (6).
Are mounted on the upper and lower surfaces of the support plate (5). (7) is a plurality of mounting bolts that are fixed by projecting horizontally from both side surfaces of the support plate (5) when the opening of the support plate (5) is directed downward, and the mounting bolt (7) is set at the outer position of the haunch. The upper part of the side plate (9) described later is detachably attached. Note that a screw rod may be used instead of the mounting bolt (7).
(8) is a fixing bolt vertically projecting from the lower surface of the flange (11), and the fixing bolt (8) detachably attaches a lower portion of the side plate (9). It is preferable that the mounting bolt (7) is fixed in advance at the factory and the fixing bolt (8) is also fixed together with the projection (2). (9) is a side plate composed of two sheets formed by bending a metal plate into a substantially S-shape and an inverted S-shape. The side plate (9) is removed after the haunch is formed.

Next, a method of constructing a floor slab using a three-dimensional truss (3) with a concrete slab in the bridge girder of the present embodiment will be described. A three-dimensional truss with a concrete slab (3) is manufactured in advance in a factory, and a U-shaped bar (4) is inserted between the longitudinal bars in a longitudinal direction so as to be drawn out. In a factory for processing the steel girder (1), the projections (2) are welded at a predetermined pitch on the upper surface of the flange (11) of the steel girder (1) and set up. First, a space truss (3) with a concrete slab is placed and laid on the upper surface of the flange (11) between the steel girders (1). After laying, the U-shaped reinforcement (4) is pulled out to the three-dimensional truss with concrete slab (3), and is pushed into the reinforcement of the adjacent three-dimensional truss with concrete slab (3), and the U-shaped reinforcement (4) is projected. ). The three-dimensional truss with the concrete slab (3) is all set in the above manner. After that, concrete is poured into the three-dimensional welded reinforcing bar (31) of the three-dimensional truss with concrete slab (3) to obtain a reinforced concrete floor of a predetermined thickness and the three-dimensional truss with concrete slab (3) is integrated to form a floor slab. It is formed.

At this time, the three-dimensional welded reinforcing bars (31) of the adjacent three-dimensional truss with concrete slab (3) are connected with the U-shaped reinforcing bar (4).
And the U-shaped streak (4) and the projection (2) are separated so as not to contact with each other, but when the concrete is solidified, the projection (2) is fixed to the steel girder (1). Since the three-dimensional trusses with concrete slabs (3) are connected to each other, the three-dimensional welded reinforcing bar (31) is fixed to the steel girder (1) with the interposition of the projection (2), so that it does not float up. Integrate. Further, even if the steel girder (1) exposed to the weather is rusted and the protrusions (2) are also rusted, the rust does not spread to the three-dimensional welded reinforcing bar (31) and can serve as a floor slab without decreasing strength. It becomes something. After the concrete is solidified, the upper part of the side plate (9) is removed from the mounting bolt (7), the lower part is removed from the fixing bolt (8), and the side plate (9) is removed.

Next, a method of constructing a floor slab with a haunch using a three-dimensional truss with a concrete slab (3) in a bridge girder of another embodiment will be described. A three-dimensional truss with a concrete slab (3) is manufactured in advance in a factory, and a U-shaped bar (4) is inserted between the longitudinal bars in a longitudinal direction so as to be drawn out. In a factory that processes steel girders (1), steel girders (1)
The projections (2) are welded at a predetermined pitch on the upper surface of the flange (11), and the fixing bolts (8) are fixed to the lower surface of the flange (11) at a predetermined pitch. First, a height adjusting nut (6) is attached to the thread of each protrusion (2) by one.
The support plate (5) is screwed together with a support plate (5) having a predetermined length, and a height adjusting nut (6) is screwed into each protrusion (2). Is set so that the upper surface of the is at a predetermined height. Then, the next support plate (5) is set in the same manner, but a gap is provided between the support plates (5) so that concrete can be cast (see FIG. 4). Next, the upper part of the side plate (9) is fixed with mounting bolts (7) projecting from the support plate (5), and the lower part of the side plate (9) is fixed with fixing bolts.
Fix in (8).

Thereafter, the space truss (3) with a concrete plate is placed and laid on the upper surface of the support plate (5). At this time,
There are a case where the end of the concrete plate (32) is placed as shown in FIG. 3 and a case where the end of the three-dimensional welded reinforcing bar (31) is placed as shown in FIG. After laying, the U-shaped bar (4) is pulled out from the inside of the three-dimensional truss with concrete slab (3), pushed into the reinforcing bar of the adjacent three-dimensional truss with concrete slab (3), and the U-shaped bar (4) is projected. Check if it is located between 2). The three-dimensional truss with the concrete slab (3) is all set in the above manner. After that, concrete is poured into the three-dimensional welded reinforcing bar (31) of the three-dimensional truss with concrete slab (3), and the three-dimensional truss with concrete slab (3) is integrated to form a floor slab with a haunch.

At this time, similarly to the above embodiment, the three-dimensional welded reinforcing bar (3) of the adjacent three-dimensional truss (3) with concrete plate is used.
Since 1) is not directly connected to and connected to the steel girder (1), even if the steel girder (1) exposed to the weather is rusted, the rust does not spread to the three-dimensional welded reinforcing bar (31), It can serve as a floor plate with haunch that does not decrease in strength. After the concrete is solidified, the side plate (9) is removed and removed.

[0014]

The present invention having the above-described structure has the following effects.

A projection (2) erected at a predetermined pitch on an upper surface of a flange (11) of a steel girder (1) of a bridge, and a concrete plate (32) arranged on an upper surface of the flange (11). ) And a three-dimensional truss with concrete slab (3) integrally formed under the three-dimensional welded reinforcing bar (31), and connected by pushing into the three-dimensional welded reinforcing bar (31) and arranged so as not to contact the protrusion (2). By forming at least the U-shaped reinforcement (4) and a structure in which the floor slab is formed by integrating the three-dimensional welded reinforcement (31) with concrete,
The joint structure of the floor slabs eliminates the need for conventional work of assembling wooden formwork and reinforcing bar arranging work on site, and eliminates the need for many workers, shortening the construction period, reducing costs and saving labor. And so on. Also, after concrete placement and curing, there is almost no need to dismantle and remove the wooden formwork, and there is no need to dispose of the wooden formwork, thereby contributing to the protection of forest resources.

According to a second aspect of the present invention, there is provided a projection (2) having a threaded portion erected on the upper surface of a flange (11) of a steel girder (1).
A three-dimensional truss with a concrete plate in which a concrete plate (32) is formed integrally with a support plate (5) set on the protrusion (2) and a lower part of a three-dimensional welded reinforcing bar (31) arranged on the upper surface of the flange (11) (3) and a U-shaped reinforcing bar (4) to be connected by being pushed into the three-dimensional welding reinforcing bar (31),
And by making the structure that the floor slab with haunch is formed by integrating the three-dimensional welded reinforcing bars (31) with concrete,
The concrete slab (32) of the space truss with concrete slab (3) can be used as a discarded formwork that also serves as a work floor.
Temporary work of formwork such as floor slabs that make up the bridge can be omitted, and the efficiency of rebar arrangement work can be promoted.When installing the conventional joint structure of slabs with haunch, labor saving, shortening of construction period, and cost reduction And the like. In addition, since the conventional disposal of wooden formwork is not required, it can contribute to the protection of forest resources.

According to a third aspect of the present invention, the cross section of the support plate (5) is formed in a U-shape, and the side plate (9) set at the outer position of the haunch is provided on both sides when the opening thereof is directed downward. By attaching and detaching a mounting bolt (7) whose upper part is detachable horizontally and fixing it, and a fixing bolt (8) whose detachable lower part of the side plate (9) is protrudingly provided on the lower surface of the flange (11), The metal side plate (9) attached to the outer periphery of the haunch can be used as a haunch mold so that it can be detached to the left and right.

According to a fourth aspect of the present invention, the mounting height of the support plate (5) is adjusted by a height adjusting nut (6) mounted on upper and lower surfaces thereof.
In this case, the height can be easily adjusted, so that it is possible to cope with a change in the height of the haunch.

A three-dimensional truss (3) with a concrete plate is provided on the upper surface of the support plate (5).
When 2) is placed, it can be used both as a stable remaining formwork and as a work floor. On the other hand, when the three-dimensional welded reinforcing bar (31) is placed on the upper surface of the support plate (5), the stability is lower than that of the concrete plate (32).
It can be used as a residual formwork and a floor plate for work. Particularly, when concrete is poured, the inside of the haunch can be seen from the reinforcing steel material so that the concrete filling condition can be easily understood and the flow of the concrete can be improved.

If the projection having the projection (321) in contact with the upper part of the side plate (9) is formed at the end of the concrete plate (32), the side plate (9) can be used during concrete casting. There is almost no danger of concrete spilling out from the upper part of the floor, and the finish is beautiful.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a main structure of the embodiment.

FIG. 3 is a sectional view showing another main part of the embodiment.

FIG. 4 is an explanatory view showing a main structure of a floor slab with a haunch of the embodiment.

FIG. 5 is a cross-sectional view showing another main part of the embodiment.

FIG. 6 is an explanatory view showing a three-dimensional truss with a concrete plate used in the present embodiment.

FIG. 7 is an explanatory view showing a three-dimensional truss with a concrete plate used in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel girder 11 Flange 2 Projection 3 Three-dimensional truss with concrete plate 31 Three-dimensional welded reinforcing bar 32 Concrete plate 321 Projection 4 U-shaped bar 5 Support plate 6 Height adjustment nut 7 Mounting bolt 8 Fixing bolt 9 Side plate

Claims (6)

[Claims] 1. A projection (2) erected and fixed at a predetermined pitch on an upper surface of a flange (11) of a steel girder (1) of a bridge, and a projection (2) arranged on the upper surface of the flange (11) and 2) Concrete slabs laid and laid to the vicinity (32)
Three-dimensional truss (3) with a concrete plate integrally formed under the three-dimensional welded reinforcing bar (31), and three-dimensional welded reinforcing bar between the three-dimensional truss with a concrete plate (3) opposed to each other across the projection (2) (31) At least a connection U-shaped reinforcing bar (4) arranged so as to be pressed into the inside and connected so as not to contact the protrusion (2), and between the three-dimensional welded reinforcing bar (31) with concrete. A joint structure of a deck slab using a three-dimensional truss with a concrete slab in a bridge girder, wherein the deck slab is formed integrally. 2. A projection (2) having a threaded portion erected at a predetermined pitch on an upper surface of a flange (11) of a steel girder (1) of a bridge, and a support plate (2) set on the projection (2). 5) and
The support plate (5) is disposed on the upper surface and the protrusion (2)
A three-dimensional truss with concrete slab (3) in which a concrete slab (32) is integrally formed below a three-dimensional welded reinforcing bar (31) arranged close to the slab, and a three-dimensional truss with a concrete slab facing the projection (2) And (3) a connection U-shaped reinforcing bar (4) arranged so as to be pressed into the three-dimensional welded reinforcing bars (31) and connected so as not to contact the projections (2), and to be formed of concrete. A slab joint structure using a three-dimensional truss with a concrete slab in a bridge girder, wherein the three-dimensional welded reinforcing bars (31) are integrated to form a slab with a haunch. 3. The support plate (5) has a U-shaped cross section, and the upper side of the side plate (9) set at the outer position of the haunch is attached to and detached from both sides when the opening thereof is directed downward. Fixing bolts (8) that allow the mounting bolts (7) to be horizontally projected and fixed, and that the lower part of the side plate (9) is detachable.
3. The joint structure of floor slabs using a three-dimensional truss with a concrete slab in the bridge girder according to claim 2, wherein the slabs are projected from the lower surface of the flange (11). 4. A three-dimensional truss with a concrete slab in a bridge girder according to claim 2, wherein the mounting height of said support plate (5) is adjustable by height adjusting nuts (6) mounted on upper and lower surfaces thereof. The joint structure of the floor slab used. 5. When laying the space truss (3) with a concrete plate on the upper surface of the support plate (5), a concrete plate (32) is placed on the upper surface of the support plate (5). The joint structure of floor slabs using a three-dimensional truss with a concrete slab in the bridge girder according to claim 2, wherein the three-dimensional welded reinforcing bar (31) is placed. 6. A bridge girder according to claim 2, wherein a projection (321) is formed at an end of said concrete slab (32) to contact an upper part of said side plate (9). Joint structure of floor slab using space truss.