JPH0616553U - PC steel fixing body - Google Patents

Abstract

(57) [Abstract] [Purpose] When the end fixing part of PC steel is located in a relatively thin concrete part and it is not preferable to project outside the concrete, the whole fixing body is buried in the concrete. [Structure] PC steel material 2 consisting of female cone 3 and male cone 4
In the fixing body 1 of FIG.
The flange 31 is used to support the reaction force of the PC steel material on the fixing plate 5. Fixing plate 5 on concrete surface 12
Can be provided at a shallow position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PC steel fixing member composed of a female cone and a male cone.

[0002]

[Prior art]

 As shown in FIG. 5, in a prestressed structure, a PC steel material fixing body 1 including a female cone 3, a male cone 4, and a fixing plate 5 for fixing the end portion of the PC steel material 2 to the concrete 10 is used. The fixing body 1 may be provided so as to project from the end surface of the concrete 10 or may be embedded in the concrete to be fixed.

By the way, depending on the structure of the PC structure, it may not be possible to embed the fixing body 1 in concrete depending on the thickness of the concrete frame of the fixing unit. In addition, it is necessary to embed it in the concrete for the purpose of avoiding protrusion, but there are cases where stress cannot be introduced into the concrete of the inevitable part.

To give a concrete example, in the former case, there may be a case of a horizontal girder of a concrete bridge girder. This is shown in FIG. For bridge girders in which a large number of girders 20 are arranged in parallel, transverse girders 21 that laterally connect the girders 20 to both ends in the longitudinal direction of the girder 20, the central part, etc. are constructed by cast-in-place PC concrete. At this time, the PC steel material 23 that introduces stress into the transverse beam is inserted as shown in FIG. It is preferable that the fixing body 1 of the PC steel material 23 is embedded in the web 22 for construction, but the web 22 of the girder 20 has a width of, for example, 240 mm, so the fixing body 1 as shown in FIG. There is a limit to the depth that can be formed, and in the conventional fixing member made of PC steel material, there was no choice but to project by projecting from the end face of the web 22. Therefore, decorative concrete is placed to cover it. Since this decorative concrete 24 is constructed on the lateral end surface of the girder, there has been a problem that it is not easy to attach the mold, hold it, and put concrete into it.

Further, as a concrete example of the latter, there is an example of a PC steel material of PC box culvert which is vertically and horizontally tightened. In this case, it is not preferable that the fixing body protrudes from the outer surface of the box culvert, so that the fixing body is embedded in the concrete. Then, there is a problem that stress is not introduced into the haunches at the four corners, which are very important for strength.

[0006]

[Problems to be solved by the device]

 An object of the present invention is to provide a PC steel fixing member developed to solve the above problems. That is, although the entire fixing body is embedded in concrete, the fixing plate can be provided at a position as shallow as possible from the concrete surface, and even a thin concrete can be provided at a position having sufficient bearing pressure. It also provides a fixing body that can introduce stress into concrete as close to the surface as possible.

[0007]

[Means for Solving the Problems]

 The PC steel fixing member of the present invention is a PC steel fixing member composed of a female cone and a male cone, and a flange for engaging with the fixing plate is provided on the outer diameter of the female cone, and this flange is used as the PC plate. It is a fixed body of PC steel characterized by transmitting the reaction force of steel.

[0008]

[Action]

 In the present invention, a flange is provided on the outer diameter of the female cone, and this flange is locked to the fixing plate.Therefore, the flange position should be provided on the upper end of the female cone on the larger diameter side than the male cone fixing position. Became possible. Therefore, the anchor plate is anchored at a position shallow from the surface of the concrete to support the reaction force, while the female cone locks the flange to the anchor plate to place the main body deep inside the concrete and the anchor body is It is possible to prevent it from protruding outward from the surface of the.

The flange is of course designed to support the reaction force of the PC steel and fix it to the fixing plate.

[0010]

【Example】

 FIG. 1 shows an embodiment of a PC steel fixing member of the present invention. The fixing member 1 of the present invention is provided with a flange 31 on the outer diameter of the female cone 3, and the flange 31 is engaged with the fixing plate 5. Therefore, the fixing plate 5 has a hole into which the female cone 3 is fitted, and the flange 31 is fixed on the fixing plate surface. The female cone is placed inside the concrete 10 rather than the fixing plate. Therefore, the sheath 6 uses a trumpet sheath having a different diameter. Since the fixing plate 5 is provided at a shallow position close to the surface of the concrete 10, the fixing can be performed even when the concrete 10 is not relatively thick, for example. The fixing plate 5 is attached with a formwork mounting pipe 51 having an inner thread.

A method of applying the fixing member 1 of the present invention will be described with reference to FIGS. FIG. 2 shows a process of mounting the fixing plate 5 of the present invention on a mold and placing concrete 10. The jig 101 is attached to the frame attachment pipe 51 of the fixing plate 5 to which the trumpet sheath is attached. The jig 101 is one in which a stud bolt 102 is attached to the back surface of a disk provided with a male screw that is screwed into the inner screw of the formwork mounting pipe 51. The stud bolt 102 of the jig 101 is inserted into the form dam 100, the nut 104 is screwed into the stud bolt 102, the washer 103 is fixed to the form dam 100, and the concrete 10 is poured. After the concrete 10 hardens, the form dam 100 and the jig 101 are removed.

In FIG. 3, after removing the formwork, the PC steel material 2 is loaded into the sheath, the female cone 3 and the male cone 4 are arranged at the fixing end, and the PC steel material 2 is tensioned and stressed using a jack (not shown). Is introduced to fix the PC steel material 2 to the fixing plate 5. After the stress is introduced, the PC steel material 2 is cut at the mouth of the fixing body 1. Then grout into the sheath. FIG. 4 shows a state in which the finishing mortar 11 has been applied, the fixing body has been embedded in the concrete 10, and the finishing has been completed. In this way, the fixing body of the present invention can be installed in the concrete by positioning the fixing plate 5 at a position shallow from the concrete surface 12.

[0013]

[Effect of device]

 According to the present invention, the fixing member and fixing plate made of PC steel can be installed in a portion shallow from the concrete surface, and the entire fixing member can be embedded in concrete. Therefore, for example, a fixing member for a transverse girder of a PC bridge girder was conventionally provided so as to project on the side surface of the web of the girder, and it was necessary to construct a decorative concrete to cover this, but to embed it inside the web. As a result, only circular traces with a relatively small diameter are left on the concrete surface, the structure of the bridge girder does not require a projecting construction part, and highly reliable labor-saving and short-term construction is possible. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a structure of a PC steel material according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a process of mounting a PC steel material frame according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing a PC steel material fixing step of the PC steel material according to the embodiment of the present invention.

FIG. 4 is an explanatory view showing a finishing step fixing step of the PC steel material according to the embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional fixing member.

FIG. 6 is an explanatory view of a cross girder of a bridge girder.

[Explanation of symbols]

 1 Fixing Body 2 PC Steel Material 3 Female Cone 4 Male Cone 5 Fixing Plate 6 Sheath 10 Concrete 11 Mortar 12 Concrete Surface 20 Girder 21 Transverse Girder 22 Web 23 PC Steel Material 24 Decorative Concrete 31 Flange 51 Formwork Pipe 100 Form Frame Board 101 Mounting jig 102 Stud bolt 103 Washer 104 Nut

Claims (1)

[Scope of utility model registration request] 1. A PC steel fixing member comprising a female cone and a male cone, wherein a flange for engaging a fixing plate is provided on the outer diameter of the female cone.