JP2003027415A - PCa GIRDER CONNECTING METHOD AND BRIDGE FALL PREVENTING METHOD - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PCa girder connecting method which employs PC steels at a joint portion, and introduces prestressing, to thereby facilitate and ensure connection of the PCa girders, and to provide a bridge fall preventing method. SOLUTION: According to the PCa girder connecting method, the PC steels 3 are arranged on a bearing portion 5 of continuous floor slab works, at every PCa girder and/or every four interfillings, under or without application of tension. Therefore, longitudinal connection of the PCa girders is facilitated and ensured, and at the same time bridge fall is prevented. Alternatively, the PC steels 3 are continuously arranged in the PCa girders 1 and/or the interfillings over a plurality of spans, under or without application of tension, to thereby connect CaPC girders 1 together and prevent the PCa girders from falling from the bearing portion 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting PCa (precast concrete) girders and a method for preventing bridge collapse. In the present invention, the PCa girder includes a precast reinforced concrete girder and a precast prestressed concrete girder.

[0002]

2. Description of the Related Art As a technique for rigidly connecting a PCa girder to a receiving beam at a connecting portion of a pier or the like of a concrete structure, a reinforcing bar protruding from the receiving beam and a reinforcing bar protruding from the end of the girder are combined on site and the connecting portion is There is a reinforced concrete structure in which concrete is poured into. In such a case, the reinforcing bars protruding from the end of the PCa girder have a large diameter and are closely arranged, and there is not much working space for the reinforcing bar assembly at the connecting portion, which requires a great deal of labor. There's a problem.

[0003]

There are the above-mentioned techniques for connecting PCa girders, but since the reinforcing bars are congested, it requires labor and is inferior in workability. Therefore, a technique for easily and surely connecting PCa digits is desired.

An object of the present invention is to solve the above problems by providing a PCa girder connecting method and a bridge preventing method by arranging a PC steel material at a PCa girder connecting portion so that the connection is easy and reliable. provide. In addition, the present invention is a PC
By arranging steel materials over the entire superstructure of multiple spans, the connection of the connecting parts can be made easy and reliable, and the PCa girder will not fall from the receiving beam even in the case of an abnormality such as damage to the connecting parts. The purpose is to do.

[0005]

The present invention has been made to solve the above problems, and is a method for easily connecting PCa digits, and the first invention is a continuous P method.
A method for connecting PCa girders, characterized in that PC steel girders are arranged in a tensioned or non-tensioned manner between the PCa girders and / or between the PCa girders on the bearing of the C floor slab. Space-filling refers to vertical joint concrete filled between girders in order to integrate girders that are adjacent in the bridge width direction. The mutual girders or the mutual packings are the girders or the packing mutuals that are adjacent to each other in the bridge axial direction on the support portion.

Next, a second invention of the present invention is a method characterized in that a PC steel material is used by penetrating a plurality of superstructures, and in a PCa girder spanning a plurality of spans of a floor slab and / or Alternatively, the PCa girder connecting method is characterized in that the PC steel materials are continuously arranged in a tensioned state or a non-tensed state during the filling.

Further, a third aspect of the present invention is a method for preventing the PCa girder from falling over even in the event of an abnormality such as an earthquake.
A method of preventing a bridge from falling down, characterized in that PC steel members are arranged with tension or non-tension between the girders and / or between the girders to prevent the PCa girder from falling from the support portion. A fourth invention of the present invention is to arrange PC steel material continuously or without tension during PCa girder and / or padding over a plurality of spans of a floor slab, and the PCa girder is bridged from the bearing portion. There is provided a method of preventing a bridge from falling, which is characterized by preventing the bridge from falling.

In the present invention, the first and second inventions may be applied simultaneously, and the third and fourth inventions may be applied simultaneously.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view of an end portion of a conventional PCa girder 1, and FIG. 5 is a vertical sectional view showing the connection of the girder 1 on the conventional bearing 5. The girder 1 is a PCa girder containing a pre-tensioned PC steel material 7. As shown in FIGS. 2 and 5, on the support portion 5, a large number of large-diameter reinforcing bars 2 are densely arranged between the girders and the gaps between the girders 1 as shown in FIGS. It is set up.

FIG. 1 is a sectional view of a PCa girder end portion showing an embodiment of the present invention, and FIGS. 3 and 4 are vertical sectional views showing connection of girders on a bearing portion of the embodiment of the present invention. 1 is a sectional view taken along the arrow A in FIG. 1, and FIG. 4 is a sectional view taken along the arrow B in FIG. According to the present invention, as shown in FIG. 1, the cross section of the PCa girder 1 or the girder 1
The PC steel material 3 is arranged in the space 4 between the two. Therefore, P
The number of the reinforcing bars 2 arranged at the end of the Ca girder 1 is reduced, and the diameter thereof can be made smaller than that of the conventional one. In some cases, the reinforcing bars 2 are unnecessary. FIG. 3 shows P in the present invention.
The Ca girder 1 is an example in which on-site concrete 6 is cast on the support portion 5 and the PC steel material 3 is arranged at the connecting portion. The PC steel material 3 has fixing portions 8 on both the girders 1 and is either tension-fixed or non-tensioned. FIG. 4 shows a state in which the PC steel material 3 is arranged in the padding 4. Not only the PC steel material 3 but also the PCa girders 1 and the paddings 4 may be arranged. In FIG. 1 of the present invention, the reinforcing bars can be significantly reduced as compared with the conventional FIG.

The PC steel material 3 shown in FIGS. 1, 3 and 4 is used.
May be placed under tension or may remain untensed. This structure works effectively as a method for preventing bridge collapse.

Next, FIG. 6 shows a vertical cross section showing another embodiment of the present invention. FIG. 7 is a vertical cross-sectional view showing connection of a conventional girder corresponding to FIG. Conventionally, the reinforcing bars 2 are arranged on the receiving beam 5 to connect adjacent girders. In the present invention, since the PC steel material 3 is continuously arranged over the entire superstructure of the bridge composed of the girders 1 having a plurality of spans and provided with the receiving beam 5 on the foundation pile 9,
It is also possible to reduce the PC steel material that is previously arranged on the Ca girder 1. Further, as shown in FIG. 6, the PC steel material 3 can be continuously arranged in tension or non-tension with respect to the girder 1 having a plurality of spans to prevent the PCa girder from falling from the support portion 5.

[0013]

According to the present invention, PCa girders can be easily and reliably connected in the bridge axis direction. In addition, it has an excellent effect that it is possible to surely prevent a fall bridge even in the case of an abnormality such as an earthquake.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a girder according to an embodiment.

FIG. 2 is a cross-sectional view of a conventional girder.

FIG. 3 is a vertical cross-sectional view of the girder of the embodiment (a view as seen from an arrow A in FIG. 1).

FIG. 4 is a vertical cross-sectional view of the girder of the embodiment (a view from the arrow B in FIG. 1).

FIG. 5 is a vertical cross-sectional view of a conventional girder.

FIG. 6 is a vertical cross-sectional view of the girder of the embodiment.

FIG. 7 is a vertical cross-sectional view of a conventional girder.

[Explanation of symbols]

1 PCa digit 2 rebar 3 PC steel 4 stuffing 5 Receiving beam 6 cast-in-place concrete 7 PC steel 8 fixing section 9 foundation piles

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[Procedure amendment]

[Submission date] July 24, 2002 (2002.7.2)
4)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Next, FIG. 6 shows a vertical cross section showing another embodiment of the present invention. FIG. 7 is a vertical cross-sectional view showing connection of a conventional girder corresponding to FIG. Conventionally, not consolidate digits that are adjacent to place the reinforcing bars 2 on the receiving beam 5. In the present invention, the foundation pile 9
Since the PC steel material 3 was continuously arranged over the entire superstructure of the bridge composed of the girders 1 having a plurality of spans with the receiving beam 5 above,
It is also possible to reduce the PC steel material pre-arranged on the a-digit 1. Further, as shown in FIG. 6, the PC steel material 3 can be arranged continuously or tautly with respect to the girder 1 having a plurality of spans to prevent the PCa girder from falling from the support portion 5.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of symbols] 1 PCa girder 2 Reinforcing bar 3 PC steel 4 Packing 5 Support part (support beam) 6 Cast concrete 7 PC steel 8 Anchorage 9 Foundation pile

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kunihiro Ishida             Marunouchi 3-4-1 shares, Chiyoda-ku, Tokyo             Ceremony Company PS F term (reference) 2D059 AA03 AA05 AA14 BB35 BB37                       BB39 GG01 GG05 GG30 GG55

Claims (4)

[Claims] 1. A method for connecting PCa girders, characterized in that PC steel members are arranged with tension or no tension between PCa girders and / or between packed PCa girders on a continuous bearing part of a floor slab. 2. A method for connecting PCa girders, characterized in that PC steel materials are continuously arranged in a tensioned state or a non-tensed state in PCa girders spanning a plurality of spans of a floor slab and / or during packing. 3. A PC steel girder is arranged with tension or non-tension between PCa girders and / or between stuffed PCa girders on a continuous floor slab bearing to prevent the PCa girder from falling from the bearing. A method of preventing a fall of a bridge characterized by: 4. A PC steel girder is continuously tensioned or non-tensioned during PCa girder spanning multiple spans and / or padding of a floor slab to prevent the PCa girder from falling from the bearing. A method of preventing a bridge from falling.