JP2994237B2 - Panel wing, precast concrete girder with panel wing and method of constructing composite structural bridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel wing used for a prestressed concrete composite floor slab bridge, a precast concrete girder with a panel wing, and a method of constructing a composite structural bridge.

[0002]

2. Description of the Related Art When constructing a concrete bridge using a prestressed precast concrete girder, conventionally, a precast concrete girder has been manufactured and arranged on an abutment. In such a conventional prestressed concrete bridge, in the case of a curved bridge having a large slope, the cross slope of the bridge surface is adjusted by thick pavement. Therefore, problems such as an increase in dead load occur. In order to cope with this, measures have been taken such as making a girder by providing a slope on the upper surface of the flange of the precast concrete girder according to the slope. For this reason, there is a problem that the mold is complicated. Therefore, there are increasing designs of so-called composite structural slabs in which the spacing between girders is increased and the slab is a reinforced concrete structure.

[0003] In constructing this composite floor slab, a method of attaching a formwork between flanges of adjacent girders and assembling a reinforcing bar and casting concrete in place is shown in FIG. There is a method in which a thin precast concrete panel 32 spanned between the bases 31 is used as a formwork and concrete 33 is cast thereon and integrated. The method of using a mold has problems that processing assembling and removing of the mold are complicated and troublesome, and waste of the mold is generated. The method using the precast concrete panel 32 shown in FIG. 8 does not require dismantling of the formwork, and is a very efficient method. However, in the overhanging slab portion from the outermost girder (ear girder), the same method as in the conventional method is required, which requires support and formwork.
Since there is mechanical insulation every m, structural integrity is lost, and there remains a technical problem that an effective structure cross section is not obtained.

[0004]

SUMMARY OF THE INVENTION The present invention provides an improvement over conventional precast concrete girder in order to rationally construct a prestressed concrete composite deck slab. An object of the present invention is to provide a reasonable precast concrete girder that does not require adjustment by pavement or the like, and to enable the construction of a composite structural bridge.

According to the present invention, it is possible to manufacture a girder having a transverse slope by flexibly responding to a change in the upper surface of the floor slab due to a transverse slope or the like without changing the shape of the formwork of the girder. It is an object of the present invention to provide a technique of forming a girder structure that does not require structural support or the like and does not lose its structural integrity.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above problems, and provides a panel wing, a precast concrete girder with a panel wing, and a method of constructing a composite structural bridge. The panel wing of the present invention should form a flange of a T-shaped concrete girder,
A member separate from the web, having the same planar shape as the one wing of the flange, the lower surface having a finished surface of the flange, the upper surface being the inner intermediate surface of the flange, and being connected to a T-shaped concrete girder web. It is a plate body provided with a connecting reinforcing bar and an upper surface dowel reinforcing bar. It is preferable that the panel wing is a connecting plate that integrally connects the left and right plates of the one wing.

The precast concrete girder with panel wings of the present invention is constructed by integrally attaching the panel wings to web concrete. In this case, it is advisable to mount the panel wing on a curved bridge at an angle. The method for constructing a composite structural bridge according to the present invention is the method for constructing a composite prestressed concrete bridge, wherein a separate precast concrete panel wing is integrated with the precast concrete girder to form a T-shaped prestressed precast concrete girder. ,
After the T-shaped prestressed precast concrete girder is erected, the panel wing is used as a formwork, and reinforcement is arranged thereon, and cast-in-place concrete is cast.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
FIG. 1 is a perspective view of a panel wing 1 according to an embodiment of the present invention, in which left and right panel wings 1a and 1b are connected by a reinforcing bar 2. The thickness of the tip 5 of the wings 1a, 1b is 5 cm,
Wing base 6 thickness is 12cm, single wing width 70c
m and a length of 2.5 m were manufactured at a factory.

The surface of the panel wings 1a, 1b is provided with a dovetail 3 connected to the cast-in-place concrete. FIG. 1 shows the left and right panel wings 1a, 1b connected by a reinforcing bar 2. The panel wing 1a shown in FIG. 2 is formed as a left and right separate body, and a connecting bar 2 for connecting to the spar portion protrudes from the side surface, and a connecting bar 4 for connecting the panels to the panel end surface.

FIG. 3 schematically shows the steps up to forming a synthetic floor slab using the panel wings 1a and 1b. FIG. 3A shows a panel wing 1 manufactured at a factory.
It is a front view of a and 1b. This panel wing 1a, 1
3b is arranged as shown in FIG. 3 (a), and a web 12 is cast at a local site (a girder yard near the site) to produce a precast concrete girder 11 with panel wings. FIG. 3B shows this step. FIG. 3C shows FIG.
After the precast concrete girder 11 with panel wing of (b) is erected on the pier, cast-in-place concrete 13
It is the schematic of the figure integrated with.

FIG. 4 shows a precast concrete girder 11 with panel wings at the end of the step of FIG.
FIG. 4 is a perspective view of a precast concrete girder with a substantially T-shaped panel wing formed thereon. The longitudinal directions of the panel wings 1a and 1b are connected by a joint 7 and are continuously integrated. FIG. 5 shows a cast-in-place concrete floor slab in which grid-shaped reinforcing bars are buried, using the panel wings of the precast concrete girder 11 with panel wings erected in the detailed view of FIG. Have been.

FIG. 6 (a) shows an example of a cross section of a precast girder formed to cope with a conventional slab having a cross slope. The frame was also complicated, diverted, and uneconomical. FIG. 6 (b) is an explanatory view corresponding to the inclined floor slab of the present invention. By tilting the panel wings 1a and 1b to form the precast concrete girder with the panel wing of the present invention, it is possible to cope with an arbitrary inclination angle. In this case, by inclining the panel wings 1a and 1b without deforming the formwork of the web 12, it is possible to manufacture the one having the upper surface inclined with the same formwork.

FIG. 7 shows an example of a formwork for forming a precast concrete girder with panel wings at a local site. An overhang frame 15 is provided on the side of a web formwork 18 and a deck 16 is mounted thereon. Then, the panel wings 1a and 1b are placed thereon via the jack 17. When manufacturing an inclined floor slab in which the panel wings 1a and 1b are inclined, the inclination wing adjusting jacks 17 and 17 are installed on the lower surfaces of the panel wings 1a and 1b, and the panel wings 1a and 1b are expanded and contracted by expanding and contracting the rams of these jacks. Can be adjusted freely. In this case, even if the radius of curvature of the bridge is small and the inclination angles at the fulcrum and the intermediate part of the girder are different, or when the inclination angles at both ends of the girder are different, the ram of the jack 17 for adjusting the panel support position can be used. By adjusting the extension amount, it is possible to correspond to various types of girders.

The panel wing used for the precast concrete girder with the panel wing of the present invention is a relatively thin member. It can be processed and used. For example, in the case of a bridge with a difference in girder spacing or a bevel (skew), cut the edge of the panel wing to the required size for cutting using a cutter and cut it into the desired shape before use. Is also possible.

[0015]

Since the panel wing and the cast concrete girder with the panel wing of the present invention are constructed as described above, the panel wing of a product member mass-produced in a factory with good quality control can be used. A girder that can cope with any inclination angle can be easily manufactured. By using such a girder, it is possible to easily construct a composite structural bridge body, and a floor slab formwork is not required, and the formability of the girder forming form is also improved. Excellent effects can be expected, such as easy production of plates.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a panel wing of an embodiment.

FIG. 2 is a perspective view showing a panel wing of the embodiment.

FIG. 3 is a process chart of forming a synthetic slab using the panel wing of the example.

FIG. 4 is a perspective view of a precast concrete girder with panel wings of the embodiment.

FIG. 5 is a detailed view of FIG. 3 (c).

FIG. 6 (a) is a cross-sectional view of a conventional spar with a cross slope,
(B) is a sectional view of a spar with a cross slope according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a method of manufacturing a spar with a cross slope according to the embodiment.

FIG. 8 is a cross-sectional view of a conventional composite structural floor slab.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 (1a, 1b) Panel wing 2 Connecting bar 3 Gibber bar 4 Connecting bar 5 Tip 6 Base 7 Joint 11 Girder 12 Web 13 Concrete 15 Frame 16 Deck 17 Jack 18 Formwork 21 T girder 22 Web 23 Flange 31 Girder 32 Panel 33 concrete

Claims (4)

(57) [Claims] 1. A member separate from a web to be formed with a flange of a T-shaped concrete girder, the planar figure having the same shape as one wing of the flange, and a lower surface provided with a finished surface of the flange. A panel wing, wherein an upper surface is an inner intermediate surface of the flange, and is a plate body provided with a connecting reinforcing bar and an upper dowel reinforcing bar which are connected to a T-shaped concrete girder web. 2. A panel wing comprising a connecting plate body integrally connecting left and right plate bodies of one wing according to claim 1. 3. A precast concrete girder with panel wings, wherein the panel wings according to claim 1 or 2 are integrally attached to web concrete. 4. A method for constructing a prestressed concrete bridge having a composite structure, wherein a T-shaped prestressed precast concrete girder is formed by integrating a separate precast concrete panel wing with a precast concrete girder. A method of constructing a composite structural bridge, comprising: after laying a concrete girder, arranging reinforcing bars on the panel wing as a formwork, and casting cast-in-place floor slab concrete.