JP3038574B2 - Connection structure of precast concrete members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for precast concrete members, and more particularly to a connection structure formed using a PC tendon.

[0002]

2. Description of the Related Art When constructing a structure by connecting a plurality of precast concrete members, a steel wire, a stranded wire or a steel rod is used to improve the structural strength of the connected portion.
Prestress may be introduced into this connection using a C tendon. For example, as shown in FIG. 4, when connecting two slab members made of precast concrete, notches 42a and 42b are respectively formed in the two slab members 41a and 41b, and the notches 42a are formed. , 42
b, the sheath tubes 43a and 43 are communicated with the joint surface.
b, and a sheath tube 47 for storage is embedded in one slab material 41a. And one slab material 41a
A PC steel rod 44 is inserted in advance into the sheath tube 43a and the storage sheath tube 47, and two slab members 41a and 41b are inserted.
After the abutting of the steel pipes on the joint surface, the PC steel rod 44 is connected to the sheath tube 43.
a, 43b, and the supporting plates 46a, 46
b, the nuts 45a and 45b are screwed together, a gear box (not shown) is arranged on the left cutout 42a in the figure, and the PC steel rod 44 is connected to the PC steel rod 44 using a torque wrench (not shown). Introduce prestress.

[0003]

In the above-described conventional connection structure, the notches 42a and 42b are formed on both surfaces of the members 41a and 41b to be joined. There is a disadvantage that it causes a decrease.

If a plate having a large area is formed by connecting a plurality of flat plates such as slab materials, joints extending vertically and horizontally exist in the plate, and the above-described connection structure is applied to such a plate. In this case, the notch must be arranged so that it does not overlap at the intersection of vertical and horizontal joints,
There is a problem that the production of the precast concrete member becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional connecting structure, and an object of the present invention is to reduce a notch portion which is a structural defect in a connecting portion between two precast concrete members. An object of the present invention is to provide a connection structure that can improve durability performance.

Another object of the present invention is to provide a method for joining a plurality of precast concrete members, in which the joints (ie, joints) are arranged vertically and horizontally.
It is an object of the present invention to provide a connection structure that can prevent the cutout portion from overlapping at the joint intersection portion.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a PC tendon insertion duct is buried in a pair of opposing precast concrete members, and the PC tendon insert duct is connected to the precast concrete member. A prestress is introduced into the prestressing member to connect the pair of precast concrete members, and one of the precast concrete members has a notch in its surface. The fixing member for fixing at least the PC tendon is provided without the provision of the PC part.
A notch for fixing the PC tendon is formed on the surface of the other precast concrete member, which is embedded in advance at the end of the tendon insertion duct, and the notch is formed in the PC tendon. Provided is a connection structure for a precast concrete member, which is connected to an end of an insertion duct. Here, the PC tendon is a linear material used to introduce prestress into a concrete member, and is, for example, a high-strength fiber such as a steel wire, a steel stranded wire, a steel rod, a cable, or a carbon fiber. There are materials.

Further, in the present invention, in a pair of precast concrete members connected in opposition, one of the precast concrete members is provided with a PC tension member without being provided with a cutout on the surface thereof. Is embedded in advance, a first PC tendon insertion duct is previously extended from the fixing member to the joint surface, and a cutout portion is previously provided in the other precast concrete member. And a second PC tendon insertion duct is previously extended from the notch to the joint surface so as to communicate with the first PC tendon insertion duct, and the pair of precast concrete The members are arranged to face each other, and a flexible PC tendon is inserted into the first and second PC tendon insertion ducts, and the PC tendon is inserted. The end is fixed is inserted into the fixing member, the other end of the PC tendon is fixed in the notch, and tension is introduced into the PC tendon, press
The pair of precast concrete members by tress
There is provided a connection structure of precast concrete members, characterized by comprising linked.

Further, according to the present invention, in a pair of precast concrete members connected in opposition to each other, one of the precast concrete members is provided with a PC tension member without being provided with a cutout on the surface thereof. Is fixed in advance, a first PC tendon insertion duct extends from the fixing member to the joint surface, and one end of the first PC tendon is fixed to the fixing member, and the first PC tendon is fixed to the fixing member. A notch portion is provided in advance on the other precast concrete member, and the first PC member extends from the notch portion.
A second PC tendon insertion duct extends in advance to the joint surface so as to communicate with the tendon insertion duct, and the pair of precast concrete members are arranged so as to face each other, and the second PC tendon is provided. One end of the second PC tendon inserted into the insertion duct is connected to the first P-tensioner via a connecting member.
The other end of the second PC tendon is connected to the other end of the second tendon, and the other end of the second tendon is fixed in the notch.
And tension force is introduced into the C tendon, by pre-stress
The pair of precast concrete members are connected
The present invention provides a connection structure for a precast concrete member.

Further, according to the present invention, in a pair of precast concrete members connected in an opposed arrangement, one of the precast concrete members is provided with a notch for fixing the PC tendon without fixing a cutout on the surface. A member is embedded in advance, and a first PC is provided from the fixing member.
A tendon insertion duct extends to the joint surface, one end of the first PC tendon is fixed to the fixing member and extends into the first PC tendon insertion duct, and the other precast concrete The member is provided with a notch in advance, and a second PC tendon insertion duct extends from the notch in advance to the joint surface so as to communicate with the first PC tendon insertion duct. And the pair of precast concrete members are arranged so as to face each other,
The second P inserted into the second PC tendon insertion duct
One end of the C tendon is connected to the other end of the first PC tendon through a connecting member, and the other end of the second PC tendon is fixed in the notch, and the first and second tendons are fixed. The present invention provides a connection structure for a precast concrete member, wherein a tension is introduced into the PC tendon.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.
FIG. 1 is a sectional view showing a connecting structure of a precast concrete member of the present invention, FIG. 2 is a sectional view of an embodiment different from FIG. 1, and FIG. 3 is a connecting structure of FIG. It is a top view at the time of applying to a crossing part.

In FIG. 1, a spring-type grip 12 for fixing a PC tendon 16 and a supporting plate 15a are buried in advance in a first slab material 11a without providing a cutout on the surface thereof. At the same time, a first sheath tube 13a is previously extended from the spring-type grip 12 to the joint surface through a hole of the support plate 15a.
The second slab material 11b is provided with a notch 17 for tension on its surface in advance, and the notch 17 for tension is provided with a perforated support so as to communicate with the first sheath tube 13a. The second sheath tube 13b is previously extended to the joint surface via the pressure plate 15b. The first and second slab members 11a and 11b thus formed as precast members are arranged so as to face each other, and a PC stranded wire 16 is passed through the notch portion 17 for tension through the support plate 15b and the second sheath tube 13b. And the tip is inserted into the spring-type grip 12 via the first sheath tube 13a, and while applying tension to the PC stranded wire 16, the screw-type grip 1 provided at the end is inserted.
A nut 14 is screwed into 6 'and fixed.

Here, the first and second slab members 11
A sealing material 19 is held between joints 18a and 11b. The sealing material 19 prevents the grout material such as mortar filling the joints 18 from entering the first and second sheath tubes 13a and 13b. In the spring grip 12, a wedge 12b formed in a shape complementary to the taper is inserted into a sleeve 12a having an inner surface formed in a tapered shape.
2b is composed of a plurality of members, and has an insertion hole for the PC stranded wire 16 in the center. A spring 12c is disposed at the large-diameter end of the wedge 12b.
a spring cap 12d so as to seal the end of a
Is fitted. Therefore, when the tip of the PC stranded wire 16 is pushed into the spring-type grip 12 from the direction of the first sheath tube 13a in FIG.
Is pressed and opened while compressing the spring 12c, and grips the tip of the wire 16 from the PC.

Next, referring to FIG. 2, a connection structure different from that of FIG. 1 will be described. In FIG. 2, a nut 24a and a perforated supporting plate 25a are arranged on the first slab material 21a without providing a cutout on the surface thereof, and the first sheath tube 23a is joined from the supporting plate 25a. It is arranged so as to communicate with the first storage sheath 31 of the surface, and the first PC tendon material 26a is inserted through this first sheath tube 23a,
The tip is screwed into the nut 24a through a hole in the support plate 25a, and the above members are integrally formed in advance as a precast concrete member in such a positional relationship.
The first storage sheath 31 is formed using a sheath tube having a diameter larger than that of the first sheath tube 23a in order to house a coupler 30 described later.

The second slab material 21b is provided with a notch 27 for tension on its surface, and a perforated supporting plate 25b is embedded in the inner surface of the notch 27 for tension. The sheath tube 23b communicates from the support plate 25b to the first storage sheath 31 on the joint surface and the first sheath tube 23b.
It is arranged so as to communicate with a and is integrally formed in advance as a precast concrete member.

The first and second slab members 21a and 21b thus formed as precast members are arranged so as to face each other, and a second PC steel rod 26b is inserted into the second sheath tube 23b. , First and second PC steel bars 26a, 2
The end of 6b is connected via the coupler 30 at the first and second storage sheaths 31,32. Then, in the notch portion 27 for tension, a fixing nut 24b and a nut for tension are screwed to an end of the second PC steel bar 26b, and the first and second PC steel bars 26a and 26b are screwed. The fixing nut 24b is tightened and fixed while introducing tension.

Here, in order to prevent grout material such as mortar filling the joint 28 from entering the first and second storage sheaths 31 and 32, the joint 28 is provided with a sealing material 29.

In the connection structure described with reference to FIG. 2, as a means for fixing the first PC steel bar 26a, a screw thread is formed at the tip of the first PC steel bar 26a, Although the nut 24a to be screwed and the support plate 25a having a hole having a size that does not allow the nut 24a to be removed are employed,
The fixing means is not limited to this, and may be another mode.
For example, instead of forming a screw thread at the tip of the first PC steel bar 26a, fixing may be performed by the above-mentioned spring-type grip.

Next, an example in which the connection structure shown in FIG. 1 is applied to a connection intersection of a plurality of slab plates will be described with reference to FIG. In FIG. 3, four slab members 51, 52, 53, 5
4 are abutted at each of the even angles, and are arranged so that the joints are cross-shaped. Slab material 5 in such an arrangement
When joining 1, 52, 53, and 54, first, the slab members 51 and 54 are connected using a plurality of connection structures in FIG. Here, as shown in the drawing, the notch 17 for tension and the spring-type grip 12 may be alternately arranged on different slab materials for each connection structure, or a tension may be applied for each corner connection structure. Notch 17 and spring grip 12
May be determined as appropriate. Next, the unit of the slab members 51 and 54 and the unit of the slab members 52 and 53 formed by connection are connected in the same manner as described above using a plurality of connection structures of FIG. That is,
The edge of the slab material 51 is brought into contact with the edge of the slab material 52,
Further, the end side of the slab material 53 is brought into contact with the end side of the slab material 54, and a plurality of connection structures of FIG. Here, the notch portions 17B and 17C of the connecting structure arranged at the joints in the Y direction and the notch portions of the connecting structure arranged at the joints in the X direction are formed at the even-angle portions of each slab material in FIG. 17A and 17D are arranged so as not to overlap. In addition, the PC strand line 16A is arranged in a curved line,
The PC stranded wire 16A is prevented from penetrating through the notch 17 for connecting joints in the X direction.

[0020]

According to the connecting structure of the present invention, one of the pair of precast concrete members arranged to be opposed to each other and connected to each other is provided with a fixing member for fixing the PC tendon without providing a cutout on the surface thereof. Is buried in advance, a notch is formed only on the surface of the other precast concrete member, and work is performed to introduce tension into the PC tendon at this notch, or the PC tendon is fixed. Therefore, in the connection structure of the present invention, the notch portion that becomes a structural defect in the connection portion between the two precast concrete members can be reduced, and the durability performance can be improved. Further, when joining a plurality of precast concrete members, even if the joints are arranged so as to intersect vertically and horizontally, it is easy to prevent the cutout portions from overlapping at the joint intersecting portion.

Further, in the connecting structure of the present invention, a fixing member is buried in one of the pair of precast concrete members arranged so as to face each other, and a cutout is formed in the other surface, and these fixing members are recessed. First and second PC tendon insertion ducts are provided for communicating between the first and second PC tendon insertion ducts, and the flexible PC tendon is passed from the notch through the second and first PC tendon insertion ducts And insert this P
Inserting the tip of the tension member into the fixing member to fix it,
A tension is introduced into the PC tendon to fix the notch. Therefore, in the connection structure of the present invention, even if a curved member is used as the PC tendon insertion duct, the PC
Since the tension member can be inserted, the arrangement of the fixing member and the notch can be more freely determined.

Further, in the connecting structure of the present invention, a fixing member is buried in one of the pair of precast concrete members arranged so as to face each other, and a cutout is formed in the other surface, and these fixing members are recessed. First and second PC tendon insertion ducts are provided for communicating between the first and second PC tendon inserts, and one end of the first PC tendon is fixed to the fixing member in advance and extends into the first PC tendon insertion duct. And a second P
One end of the second PC tendon inserted into the C tendon insertion duct is connected to the other end of the first PC tendon through a connecting member, and introduces tension into the first and second PC tendons. Then, the end of the second PC tendon is fixed at the notch. Therefore, in the connection structure of the present invention, the fixing member and the first P
There is an advantage that the C tendon can be reliably connected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a connection structure of a precast concrete member of the present invention.

FIG. 2 is a sectional view of an embodiment different from FIG. 1;

FIG. 3 is a plan view when the connection structure of FIG. 1 is applied to a connection intersection of a plurality of slab plates.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

11a, 21a First slab material (precast concrete member) 11b, 21b Second slab material (precast concrete member) 13a, 23a First sheath tube (first PC tendon insertion duct) 13b, 23b Second Sheath tube (second PC tendon insertion duct) 14a Spring-type grip (fixing member) 15a Support plate (fixing member) 16 PC steel stranded wire (PC tendon) 17, 27 Notch for tension (notch) 24a Nut (fixing member) 25a Support plate (fixing member) 26a First PC steel rod (PC tension member) 26b Second PC steel rod (PC tension member) 27 Notch portion for tension (notch portion) 30 Coupler (Connecting member)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryoichi Sato 2980, Ishii-cho, Utsunomiya-shi, Tochigi Utsunomiya University Ishii Staff Dormitory No. 3 (72) Inventor Youichi Abe 283-1-3-203 Owada, Yachiyo-shi, Chiba (72) Inventor Shoichi Kameda 1-724, Sanrizuka 1-724, Narita-shi, Chiba Pref. 17 Building No. 5 (72) Inventor Masashi Kumakura 18, Niizari, Oaza, Iwafune-cho, Shimotsuga-gun, Tochigi Prefecture 1-1 Oriental Construction Co., Ltd. (72) Inventor Toshiaki Hirado 2-1-1 Hirakawacho, Chiyoda-ku, Tokyo Oriental Construction Co., Ltd. (56) References JP-A-2-132294 (JP, A) Opened 52-113511 (JP, A) Opened 2-47242 (JP, U) Opened 51-141003 (JP, U) Opened 62-193008 (JP, U) Opened 51-138909 (JP, U) J , U) (58) investigated the field (Int.Cl. ^7, DB name) E04B 1/61 E04G 21/12 104

Claims (3)

(57) [Claims] A PC tendon insertion duct is buried in a pair of opposing precast concrete members, and a PC tendon is inserted into the PC tendon insertion duct, and the PC tendon is inserted into the PC tendon. A stress-introduced connecting structure for connecting the pair of precast concrete members, wherein one of the precast concrete members is provided with at least a PC tendon material without a notch provided on its surface. The fixing member is the PC
A notch for fixing the PC tendon is formed on the surface of the other precast concrete member, which is embedded in advance at the end of the tendon insertion duct, and the notch is formed in the PC tendon. A connection structure for a precast concrete member, which is connected to an end of an insertion duct. 2. A pair of precast concrete members connected in opposition to each other, wherein one of the precast concrete members is provided with a fixing member for fixing a PC tendon member without providing a cutout on the surface thereof. Is embedded in advance, and a first P
C tendon insertion duct is extended to the joint surface in advance,
A cutout portion is provided in advance on the other precast concrete member, and a second PC tendon insertion duct is connected from the cutout so as to communicate with the first PC tendon insertion duct. The pair of precast concrete members are extended in advance to the joint surface, the pair of precast concrete members are arranged to face each other, and a flexible PC tendon is inserted into the first and second PC tendon insertion ducts. PC
One end of the tendon is inserted and fixed in the fixing member, and the other end of the PC tendon is fixed in the cutout portion, and tension is introduced into the PC tendon , thereby causing a prestress.
The pair of precast concrete members are connected
Coupling structure of precast concrete members, characterized by comprising. 3. A pair of precast concrete members connected in opposition to each other, wherein one of the precast concrete members is provided with a fixing member for fixing a PC tendon member without providing a cutout on the surface thereof. Is embedded in advance, and a first PC tendon insertion duct extends from the fixing member to the joining surface, and one end of the first PC tendon is fixed to the fixing member, and the first PC tendon insertion is performed. A notch is provided in advance on the other precast concrete member extending into the duct, and the notch is communicated with the first PC tendon insertion duct from the notch. A second PC tendon insertion duct extends in advance to the joint surface, and the pair of precast concrete members are arranged so as to face each other, and the second PC tendon insertion duct is provided. The other end of the second PC tendon is connected to the other end of the first PC tendon via a connecting member, and the other end of the second PC tendon is fixed at the cutout. Tension is introduced into the first and second PC tendons, and the pair of pretensioners are prestressed.
Coupling structure of precast concrete members, characterized in that the catcher strike the concrete member is coupled.