JP2003268922A - Anchorage body of pc steel member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchorage body which is simple as a anchorage section of a PC steel member of a precasting concrete member and easy in a tensioning work. <P>SOLUTION: One circle of PC steel member of a segment ring is divided into a plurality of pieces and connected for instance. The anchorage body 1 is attached to the connection parts of the divided PC steel members 50a, 50b. The anchorage body 1 is constituted of a pair of anchorage members 11a, 11b anchoring the end of the PC steel member 50a, 50b respectively and a plurality of screw bolts 21 drawing the pair of anchorage members 11a, 11b and imparting a specified tension to both the PC steel members. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing member for PC steel materials, and more particularly, to a pulling force required for both PC steel materials by pulling the ends of the PC steel materials facing each other and extending in opposite directions. The present invention relates to a fixing body that is applied and fixed.

[0002]

2. Description of the Related Art In order to apply a hoop tension to a cylindrical prestressed concrete structure, a pilaster or notch is provided on the wall surface of the structure, and from this portion, P
It is general that C steel material is inserted into concrete in a circumferential shape, both ends of the PC steel material are crossed, and tension is established and fixed at this portion.

A similar technique is used in the tunnel also when the PC steel material is inserted in the circumferential direction of the segment ring forming the lining of the shield tunnel to be tensioned. For example, two notches are provided on the inner surface of the segment, and the ends of the circumferential PC steel material are intersected at this part, and the ends are fixed at the notches. In such a conventional technique, it is not easy to insert the PC steel material into one circumference, and it is not easy to attach a large jack to the concrete notch at the end of the PC steel material to fix the tension.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to develop and provide a PC steel fixing body which solves the above problems. In particular, it is an object of the present invention to improve a fixing body of PC steel material used for tension fixing of PC steel material in the circumferential direction of a precast concrete segment used as a lining of a shield tunnel.

[0005]

The present invention has been made in order to solve the above problems, and is a PC steel fixing member characterized by the following technical means. That is,
According to the present invention, a pair of fixing members for fixing the ends of PC steel materials having opposite ends and extending in opposite directions, and a tensioning means for pulling the pair of fixing members to apply a required tension to both PC steel materials. It is a fixing body of PC steel material characterized by comprising

If the tensioning means is a plurality of bolts and nuts, it is preferable that the tensioning force can be easily applied to the PC steel material with a simple structure. Further, the fixing member is attached to opposite ends of a PC steel material, which is formed by assembling a segment piece into a cylindrical shape and dividing one circumference of a segment ring into a plurality of segments, and connecting the segment rings with tension to introduce a hoop tension into the segment ring. It is suitable for use as a fixing member for fixing by fixing.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a PC steel material 5 according to an embodiment of the present invention.
0a, 50b is a plan view showing the fixing member 1, FIG. 2 is a side view thereof, and FIGS. 3, 4, and 5 are AA, BB, and C of FIG. 2, respectively.
It is a -C arrow line view. The PC steel fixing body 1 of the present invention includes a pair of fixing members 11a and 11b. This fixing member 11
Each of a and 11b has, for example, a rectangular parallelepiped shape, and is provided with a tensioning means for pulling the fixing portion of PC steel material to each other. That is, the fixing members 11a and 11b are provided with fixing portions for fixing the ends of the PC steel materials 50a and 50b, which have opposite ends and extend in opposite directions, by the wedges 12 or the like. Further, for example, a screw bolt 21 is provided as a tensioning means for pulling the pair of fixing members 11a and 11b to apply a required tensile force to both the PC steel materials 50a and 50b. The fixing body 1 made of these members is housed in the recessed hole provided inside the segment. After the PC steel material is strained, the recess is filled with grout material having the same strength as the segment. In this embodiment, as shown in FIG. 8, the screw bolt 21 is screwed into a female screw 23 provided on the other fixing member 11b through a hole 24 of the one fixing member 11a.
When the head of the screw bolt 21 is twisted with a torque wrench or the like, the screw bolt 21 is fixed to the fixing member 11b and the fixing member 11a.
Attract each other. This twisting work can be performed using the electric torque wrench 31 and the double wrench 33 as shown in FIG. The electric torque wrench 31 has a rotary head 32.
The double wrench 33 has a square hole 34 into which the rotary head 32 is inserted, and the two bolt head locking spanners 35 are simultaneously operated by a gear device incorporated in a gear box 36. The two screw bolts 21 attached to the fixing members 11a and 11b of the fixing body housed in the recesses 40 provided in the segments are simultaneously twisted by the two spanners 35.

FIG. 6 and FIG. 7 show a state in which the fixing member 11b has been pulled by a required stroke.
Tensile force is applied to the C steel materials 50a and 50b. A predetermined hoop tension can be applied to the circumferential PC steel material by pulling a predetermined amount of the fixing member of the fixing body 1 at the connecting portion of the divided PC steel materials. Moreover, this fixing body 1
Do not need to have reaction force supports on the segments as they are pulled to balance each other. FIG. 8 shows the fixing member 11a,
11b and the PC steel materials 50a, 50b are joined together and the fixing members 11a, 11b are drawn to the PC steel materials 50a, 50b.
It is a figure which shows the tension | tensile_strength means which gives tension to b. The fixing members 11a and 11b are provided with tapered holes for fixing the PC steel material, and the PC steel materials 50a and 50b are fixed to the tapered holes by the wedge 12.

FIGS. 9 and 10 are explanatory views showing a bolt nut which is a tensioning means. The screw bolt 21 has a head 22, penetrates through a hole (dumb hole) 24 in one fixing member 11a, and is screwed into a female screw 23 (corresponding to a nut) provided in the other fixing member 11b. This female screw 23 is a PC
It is formed to have a required length for applying a required tension to the steel materials 50a and 50b. It should be noted that an extra portion that does not need to be provided with a screw is an enlarged hole 25 having an enlarged inner diameter. The screw bolt 21 can be easily twisted with a torque wrench.

FIG. 11 is an explanatory view showing a state similar to that of FIG. 6, showing a cross section of the fixing members 11a and 11b and showing a concrete structure of this embodiment.

[0011]

INDUSTRIAL APPLICABILITY The fixing member of PC steel material of the present invention is used in a connecting portion of PC steel material which divides and divides one circumference of a segment ring in which segment pieces are assembled into a cylindrical shape, and the PC steel material is tensioned. Then, the hoop tension is introduced into the segment ring to fix it. At this time, there is no loss of tension due to set loss. Moreover, the amount of elongation of PC steel can be measured. By adopting this fixing body, in particular, the PC steel material in the circumferential direction of the precast concrete segment used as the lining of the shield tunnel has been conventionally fixed by inserting the PC steel material over one circumference and intersecting the ends thereof. On the other hand, the PC steel material is inserted by dividing the circumference into a plurality of pieces, and the fixing body of the present invention is used at each connecting portion of the divided PC steel materials. It became easier.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a view taken along the line BB of FIG.

5 is a view taken along the line CC of FIG.

FIG. 6 is a plan view of the embodiment.

FIG. 7 is a side view of the embodiment.

FIG. 8 is an explanatory diagram of an example.

FIG. 9 is an explanatory diagram of an example.

FIG. 10 is an explanatory diagram of an example.

FIG. 11 is an explanatory diagram of an example.

FIG. 12 is an explanatory diagram of a twisting work.

[Explanation of symbols]

1 fixing body 11a, 11b fixing member 12 wedges 21 screw bolt 22 bolt head 23 Female thread (nut) 24 holes 25 enlarged hole 31 Electric torque wrench 32 rotating heads 33 double wrench 34 Square hole 35 bolt head spanner 36 gearbox 40 recess 50a, 50b PC steel

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16B 7/18 F16B 7/18 A F16G 11/00 F16G 11/00 R 11/04 11/04 A F term (Reference) 2D055 BA01 BB01 EB01 GC03 2E164 DA24 DA25 DA32 3J022 DA12 EA34 EB12 EB14 EC13 EC22 ED23 FB12 GA04 GB02 3J039 AA01 BB01 CA02 CA16 DA04 GA04 GA07

Claims (3)

[Claims] 1. A pair of fixing members for fixing the ends of PC steel materials having opposite ends and extending in opposite directions, and a tension for pulling the pair of fixing members to give a required tension force to both PC steel materials. A fixing member of PC steel material, which comprises: 2. The fixing member of PC steel material according to claim 1, wherein the tensioning means is a plurality of bolts and nuts. 3. The fixing member is attached to opposite ends of a PC steel material, which is obtained by dividing one circumference of a segment ring, which is a cylindrical assembly of segment pieces, into a plurality of segments, and connecting the segment steel pieces.
The fixing body for PC steel according to claim 1 or 2, which is a fixing body for tensioning a steel material and introducing a hoop tension into the segment ring to fix the steel material.