JP2001172913A - Elevated bridge and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily construct an elevated bridge with large quake-proof strength. SOLUTION: A bridge abutment beam 4 made of precast concrete with a jaw 8 for placing the beam is crimped and joined to the head part of a precast concrete post 3 being erected at an appropriate interval on a foundation 2, precast concrete girders 5 and 6 are erected between the jaws 8 for placing the beam of the bridge abutment beam 4 via a support 10, the end part of the precast concrete beams 5 and 6 being installed opposite to the jaw 8 for placing the beam of the bridge abutment beam 4 is crimped and joined to the bridge abutment beam 4 by a lower tendon 11 through the jaw 8 for placing the beam and an upper tendon 12 through the upper side of the jaw 8 for placing the beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viaduct and a construction method thereof.

[0002]

2. Description of the Related Art In a conventional viaduct, as shown in FIG. 6, a foundation 21, columns 22 and beams 23, a girder 24, a floor plate 25 and a soundproof wall 26 are integrally formed by a conventional construction method. The girders 24 between the columns 22 are joined by an expansion joint.

[0003]

However, such a viaduct as described above is troublesome because it is constructed by a conventional method, and the girders are not rigidly joined to the columns, and the girders are joined by expansion joints. Therefore, there was a risk of falling off the pillar when a large earthquake occurred.

The present invention has been made in view of the above problems, and an object of the present invention is to easily construct a viaduct having a large earthquake resistance.

[0005]

Means for solving the above problems are as follows. The invention according to claim 1 is characterized in that the invention according to claim 1 is provided on a head of a precast concrete column erected at an appropriate interval on a foundation. An abutment with a jaw is press-bonded with a tendon, and a precast concrete girder is erected between the beam mounting jaws of the abutment via a support, and faces the beam mounting jaw of the abutment. The ends of the installed precast concrete girder are crimped to the abutment by means of a lower tendon that penetrates the beam mounting jaw and an upper tendon that penetrates above the beam mounting jaw. And

According to the first aspect of the present invention, since the precast concrete girder is press-bonded to the column with a tension member, that is, rigidly connected, a viaduct having a large seismic strength can be easily constructed. In addition, since the ends of the precast concrete girder are crimped to the precast concrete abutment with the lower tendon and the upper tendon, even if the precast concrete girder is destroyed by a horizontal or vertical load due to a large earthquake, It will not hang and fall.

According to a second aspect of the present invention, a precast concrete girder erected via a bearing between heads of precast concrete columns erected at appropriate intervals on a foundation is press-bonded with a tension member. The end of the precast concrete girder installed opposite the head of the precast concrete column is crimped by a lower tendon and an upper tendon via joint materials.

According to the second aspect of the present invention, the precast concrete girder is crimped to the head of the precast concrete column with a tendon, and the ends of the precast concrete girder are also crimped with the lower tendon and the upper tendon. This makes it possible to easily construct a viaduct having a large earthquake resistance. Also, even if the precast concrete girder is destroyed by a large earthquake, it does not fall because it is rigidly connected to the precast concrete column.

According to a third aspect of the present invention, there is provided a precast concrete girder via a bearing between heads of precast concrete columns erected at appropriate intervals on a foundation,
One end of the precast concrete girder is pressure-bonded to the precast concrete column with a tendon, and then the other end is pressure-bonded to the precast concrete column with a tendon.

According to the third aspect of the present invention, when a precast concrete girder is joined to a precast concrete column, the other end is free when one end is joined, and the one end is joined. Since the other end is later joined, the indeterminate secondary stress and the loss of the prestress force can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the viaduct of the present invention and a construction method thereof will be described below in detail with reference to the drawings. There are two embodiments of the viaduct, FIGS. 1 to 4 show the viaduct of the first embodiment, and FIG. 5 shows the viaduct of the second embodiment.

The viaduct 1 of the first embodiment is made of a prestressed precast concrete column (hereinafter referred to as a column) 3 erected at an appropriate interval on a foundation 2 and a prestressed precast concrete column installed at the head of the column 3. A precast concrete girder comprising an abutment (hereinafter referred to as an abutment) 4, a main girder 5 made of prestressed precast concrete and a side girder 6 made of prestressed precast concrete stretched between the abutments 4;
The slab 7 is formed by casting cast-in-place concrete on the main girder 5 and the side girder 6.

The abutment 4 has a beam mounting jaw 8 along its length.
Are protruded and crimp-bonded to the column 3 with the tendon 9 from the foundation 2. The term “compression bonding” refers to joining precast concrete members to which prestressing has been applied by applying a predetermined prestress with a tendon such as PC steel wire or PC steel rod. Therefore, the foundation 2, the pillar 3, and the abutment 4 are crimped and joined, and the foundation 2 is also crimped to the pile 2a.

The main girder 5 has a T-shaped cross section. Both ends of the main girder 5 are mounted on a beam mounting jaw 8 through a bearing 10 such as a hard rubber, a stainless steel plate or a Teflon (registered trademark) plate. .. Are opposed to the ends of the main girders 5a, 5b. The lower tendon 11 is disposed from the end of the first main girder 5a to the end of the second main girder 5b through the beam mounting jaw 8 and the end of the first main girder 5a. An upper tendon 12 is arranged from the upper part of the second main girder 5b to the upper end of the second main girder 5b through the upper side of the beam mounting jaw 8. Are rigidly connected to the abutment 4. A joint material 13 such as mortar is filled between the ends of the main girders 5a, 5b,... And the beam mounting jaws 8.
On the other hand, the side girders 6 are also pressure-bonded to the abutment 4 in the same manner as described above. Therefore, the main girder 5 and the side girder 6 are rigidly joined to the column 3. When the slab 7 is constructed by casting cast-in-place concrete on these, the viaduct 1 of the ramen frame is constructed.

Next, a method for constructing the above-mentioned viaduct will be described with reference to FIG. Since the pillar 3, the abutment 4, the main girder 5, and the side girder 6 that constitute the viaduct 1 are each made of prestressed precast concrete, they are manufactured at a factory and carried to the site.

Next, a pair of columns 3 is temporarily fixed on the foundation 2 by using these, and an abutment 4 is installed on the head thereof and is bonded by crimping 9 with the tension member 9 from the foundation 2. A mold pier 14 is formed (see FIG. 3).

Next, the main girder 5 and the side girder 6 are erected between the abutment 4 via a support 10 such as a hard rubber, a stainless steel plate or a Teflon plate, and each of the main girder 5 and the side girder 6 is installed opposite the beam mounting jaw 8. The lower tendon 11 and the upper tendon 12 are wired to the ends of the main girders 5a, 5b. At this time, since the main girder 5 and the side girder 6 are temporarily fixed to the abutment 4, joints are provided between the ends of the first and second main girder 5 a and 5 b and the beam mounting jaw 8. When the material 13 is filled and a predetermined tension is applied and fixed to the lower tendon 11 and the upper tendon 12, the first main girder 5 a is pressure-bonded between the abutments, while the second main girder is joined. 5b
Is press-bonded at only one end, and the other end is free, that is, freely movable. Next, the other end of the second main girder 5b and the third main girder 5c in the same manner as described above.
When the second main girder 5b is joined by crimping to one end of the third main girder 5b, the other end of the third main girder 5c is movable. Then, as shown in (2) of the figure, the main girders 5a, 5b,...
Is formed, the viaduct 1 of the ramen frame is constructed. In this manner, when the other end of the main girder 5 is movable and the one end is joined, the indeterminate secondary stress and the loss of the prestress force can be reduced.

FIG. 5 shows a viaduct 15 of the second embodiment, in which the bridge 4 in the first embodiment is removed.
The main girder 5 is mounted on the head of the pillar 3 via a bearing 10 such as a hard rubber, a stainless steel plate or a Teflon plate. The ends of the main girders 5a, 5b,... Are respectively crimp-bonded to the heads of the columns 3 with tendons 9 and the lower tendons 11 wired thereto.
The upper tension member 12 and the upper tension member 12 are connected by being prestressed. A joint material 13 such as mortar is filled between the opposed ends. Therefore, the main girder 5 is directly and rigidly connected to the column 3, and concrete is cast on this to form the slab 7. When the main girder 5 is placed on the head of the column 3 in this way, the viaduct 15 of the ramen frame can be easily constructed. Each of the main girders 5a, 5b, 5c,... Is prestressed and connected by tension members 11, 12, and is rigidly joined to the column 3 by a tension member 9. Therefore, even if a large earthquake, a so-called direct-type earthquake, strikes directly, the main girders 5a, 5b, 5c.

The construction method of the viaduct will be described with reference to FIG. First, a pair of PC columns 3 is temporarily fixed on the foundation 2 and the main girder 5 and the side girder 6 are erected between the heads via a bearing 10 such as a hard rubber, a stainless steel plate or a Teflon plate. The end is temporarily fixed with the tendon 9 from the foundation 2.

Next, as shown in FIG. 1A, the lower tendon 11 extends over the end of the main girder 5 installed at the head of the column.
And the upper tendon 12 are wired. And the first main girder 5
When the joint material 13 is filled between the end of the first main girder 5a and the end of the second main girder 5b, and the lower tendon 11 and the upper tendon 12 are prestressed and fixed, the first main girder 5a Is connected to one end of the second main girder 5b. Next, when the other end of the first main girder 5a and one end of the second main girder 5b are press-bonded to the column 3 with the tension member 9, the other end of the second main girder 5b is joined. Are free, that is, freely movable. Next, the other end of the second main girder 5b and one end of the third main girder 5c are connected to the tendon 1 by the same method as described above.
After connecting at 1 and 12, these ends are crimped to the column 3 with the tendon 9 as described above. When this method is sequentially repeated, the main girders 5a, 5b, 5c... Are fixed between the columns 3, and cast-in-place concrete is cast thereon to form the slab 7, whereby the viaduct 15 of the rigid frame is constructed. . Also in this case, the static indeterminate secondary stress and the loss of the prestress force can be reduced in the same manner as described above.

[0021]

According to the present invention, since the main girder is crimp-bonded to the column with a tension member, it is possible to easily construct a viaduct having a large earthquake resistance.

Since the end of the main girder is crimped to the abutment with the lower tendon and the upper tendon, even if the main girder is broken by a horizontal load or a vertical load due to a large earthquake, the main girder hangs on the column. It does not fall in a state.

When joining the main girder to the column, when joining one end, the other end is free, and after joining one end, the free end is joined. The secondary stress and the loss of the prestress force can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a viaduct.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIGS. 4 (1) and (2) are cross-sectional views of a viaduct construction method.

FIGS. 5 (1) and (2) are cross-sectional views of a viaduct construction method.

FIG. 6 is a cross-sectional view of a conventional viaduct.

[Explanation of symbols]

 Reference Signs List 1,15 viaduct 2,21 foundation 3,22 pillar 4,23 abutment beam 5,24 main girder 6 side girder 7 slab 8 beam mounting jaw 9 tension member 10 bearing 11 lower tension member 12 upper tension member 13 joint member 14 Pier 25 Floor board 26 Soundproof wall

Claims (3)

[Claims] An abutment having a beam mounting jaw is crimp-bonded to a head of a precast concrete pillar erected at an appropriate interval on a foundation with a tension member, and the beam is mounted on the abutment. A precast concrete girder is installed between the jaws via a bearing, and the ends of the precast concrete girder installed opposite to the beam mounting jaw of the abutment bridge have a lower tension that penetrates the beam mounting jaw. A viaduct characterized by being crimped to an abutment by means of a material and an upper tendon which penetrates above a beam mounting jaw. 2. A precast concrete girder erected via a bearing between the heads of precast concrete columns erected at appropriate intervals on a foundation is crimp-bonded with a tension member, and the heads of the precast concrete columns are provided. A viaduct, wherein ends of precast concrete girders installed opposite to each other are press-bonded to each other by a lower tendon and an upper tendon via joint materials. 3. A precast concrete girder is erected via a bearing between heads of precast concrete columns erected at appropriate intervals on a foundation, and one end of the precast concrete girder is tensioned to the precast concrete column. A method of constructing a viaduct, characterized in that after crimping with a material, the other end is crimped to a precast concrete column with a tension material.