JP3270628B2 - End support structure for tendon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a state in which a tension member such as a cable or a rod incorporated in a steel structure such as an arched main beam or an arc-shaped structure is tensioned to introduce prestress into the steel structure. The present invention relates to a tension member end support structure for fixing the tension member end portion to the steel structure.

[0002]

2. Description of the Related Art Conventionally, in a structure for supporting an end portion of a tendon in a roof slab constituting a steel structure, as shown in FIG. 5, both ends of a tendon 32 are attached to inner structural members of a roof slab 33, respectively. 33a and the outer structural member 33b (or the outer structural member 3
The column members 31) that support 3b are used as attachment portions 34 and 35, respectively. That is, the tension member 32 is attached to one of the mounting portions 34.
And a receiving member 36 having a concave spherical receiving surface 38 is provided on the other mounting portion 35, and a convex spherical sliding contact surface 40 is provided on the other end of the tension member 32. The retaining member 37 is provided, and the sliding member 40 is slidably contacted with the receiving surface 38 so that the tension member 32 is swingably tensioned. Specifically, a receiving surface 38 is formed on one side of the receiving body 36, and an insertion hole 39 penetrating from the receiving surface 38 to the other side of the receiving body 36 is formed. An insertion hole 4 which forms the sliding contact surface 40 and penetrates from the sliding contact surface 40 to the other side of the retaining 37
1 are formed. Then, the other end of the tension member 32 is inserted into the insertion hole 39 and the insertion hole 41, respectively, and connected by the nut 42.
Are brought into sliding contact with each other, and the seating member 36 is
Through the substantially center of the insertion hole 39. This is because the other end of the tension member 32 can swing over a wide range so as to cope with a case where the roof slab 33 is deformed due to a blowing force, a snow load, a seismic force, etc. acting on the roof slab 33. To do that.

[0003]

However, in the above-mentioned conventional end member supporting structure of the tendon, the receiving body 36 is attached to the mounting portion 35 set in advance at the factory on the outer structural member 33b of the roof slab 33 or the like. It is fixed by welding. This welding fixation is performed when the tension member 32 is tensioned at the construction site and the mounting portion 3 provided on the inner structural member 33a of the roof slab 33.
4, the tension member 32 is inserted into the through hole 3 of the seat 36.
9 is carried out at an attachment angle that is assumed to pass through the approximate center of 9. If the mounting angle is wrong,
When the tension member 32 is tensioned after the installation of the roof slab 33 to which the panel 2 is attached, the tension member 32 may be displaced from substantially the center of the insertion hole 39 of the seat 36. In case of deviation,
The roof slab 33 cannot sufficiently respond to the deformation of the roof slab 33 caused by the blowing force or the like acting on the roof slab 33.

The receiving body 36 is formed in a flat plate shape and not only serves as a fixing portion for mounting to the mounting portion 35 such as the external structural member 33b, but also has a retaining stopper 37 on the receiving body 36.
A receiving surface 40 is formed such that a lubricant layer is interposed between the sliding surface 38 and the sliding contact surface 38 to increase the contact area. For this reason, in order to make the receiving surface 40 of the receiving body 36 and the sliding contact surface 38 of the retaining member 37 satisfactorily contact each other, they must be processed with high precision, and the receiving member 36 and the retaining member 37
Cannot be manufactured at low cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to make a receiving body and a retaining member into parts so that it can be manufactured at a low cost, and a receiving body can be attached to a steel structure on site. At a desired mounting angle.

[0006]

In order to achieve the above-mentioned object, the present invention provides two separate points in a steel structure as attachment parts for attaching both ends of a tension member, and one of the attachment parts is provided with the tension member. One end of the material is fixed, and a receiving member having a concave spherical receiving surface is provided on the other mounting portion, and a retaining member having a convex spherical sliding contact surface at the other end of the tension member is provided. An end support structure for a tension member, wherein the tension member is slidably slidable by sliding the sliding contact surface against the receiving surface, wherein the receiving member is formed in a cylindrical shape; The receiving surface is formed on one of the open end sides, and a fixing portion for fixing to the steel structure by a bolt and nut is formed on an outer peripheral portion of the receiving body.

[0007]

According to the above construction, the seat body is formed in a cylindrical shape,
The contact area of the receiving surface is made smaller than before.

Further, a fixing portion is formed on the outer peripheral portion of the seat body, and the seat body is attached to the steel frame structure with a bolt and a nut at the fixing portion. In this case, the mounting position of the seat body is adjusted by the clearance between the bolt and the bolt hole formed in the steel structure. Also, the distance between the steel structure and the fixing portion in the circumferential direction of the seat body is appropriately adjusted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a sectional view taken along the line AA of FIG. 1A, showing an end support structure of a tendon according to an embodiment of the present invention, and FIG. 1B is a right side view of FIG. FIG. 2A is a cross-sectional view of a steel structure having the tendon end support structure shown in FIG.
(2) is a plan view as viewed in the direction of the arrow P in (1), and FIG. 3 is a cross-sectional view showing an inclined mounting state of a receiving body in the tension member end support structure shown in FIG.

In FIG. 2, 1 is a column, 2 is a roof slab (steel structure) that covers only a spectator stand surrounding the ground.
It is. The pillar 1 supports an outer shell of the roof slab 2, and an inner frame of the roof slab 2 is provided with an opening frame 3 made of a girder or the like. A plurality of cylindrical support members 4A are provided at a lower portion of the opening frame 3 at intervals in a circumferential direction.
These support fittings 4A are connected via an annular cable 5 (or rod) inserted therethrough. A main beam 9 made of an H-shaped steel is provided at a portion of the outer shell of the roof slab 2 near the column 1, and a plurality of bolt holes 10 are formed in a flange portion 4B of the main beam 9 corresponding to each support metal 4A. An opening 11 is formed at the center of the bolt hole 10.

Two separate points on the roof slab 2 are rods 6
It is a mounting part for mounting both ends of (tensile material),
One of the mounting portions is formed by a support metal 4A, and the other mounting portion is formed by a flange portion 4B of a main beam 9 having a bolt hole 10 and an opening 11. In addition, this mounting part is roof slab 2
May be provided not on the main beam 9 but on the column 1.

One end of a rod 6 is connected to the support 4A. A seat 12 is attached to the flange portion 4B of the main beam 9 as described later, and a stopper 13 is attached to the other end of the rod 6 as described later.

On one side of the stopper 13, a convex spherical sliding contact surface 1 is provided.
4 and an insertion hole 15 penetrating from the sliding contact surface 14 to the other side of the stopper 13. In addition, a concave spherical receiving surface 16 is formed on one side of the receiving body 12, and an insertion hole 17 penetrating from the receiving surface 16 to the other side of the receiving body 12.
Are formed.

The other end of the rod 6 is inserted into the insertion hole 17 of the receiving body 12 and the insertion hole 15 of the stopper 13, respectively, and connected by a nut 18 screwed to the insertion portion of the rod 6. The sliding surface 14 of the retaining 13 is the receiving surface 16 of the seat 12.
And the rod 6 is tensioned as described later. The rod 6 is disposed substantially at the center of the insertion hole 17 of the receiving body 12 and is swingably supported by the sliding surface 14 and the receiving surface 16. Reference numeral 19 denotes a lock nut for locking the nut 18.

The receiving body 12 is formed in a cylindrical shape, and a receiving surface 16 is formed on one open end side of the receiving body 12. Further, a fixing portion 22 is formed on the outer peripheral portion of the receiving body 12 with a bolt 20 and a nut 21 to be fixed to the main beam 9 or the like constituting the roof slab 2.

The fixing portion 22 has a mounting plate 22a formed on the outer peripheral portion of the seat 12 and a plurality of rib plates 22b provided radially between the mounting plate 22a and the outer peripheral portion of the receiving body 12. The mounting plate 22a is formed with an opening 22c for accommodating the retaining stopper 13, and the mounting plate 22a is formed with bolt holes 22d opening between the rib plates 22b.

In the above configuration, the end support structure of the rod 6 is assembled as follows. First, one end of the rod 6 is fixed to the support metal 4A provided in the opening frame 3, and the mounting plate 22a is brought into contact with the surface of the main beam 9 on the support metal 4A side of the flange 4B to be provided on the flange 4B. The bolt 20 is inserted into the bolt hole 10 and the bolt hole 22d provided in the mounting plate 22a, and the nut 21 is screwed and fastened to the insertion portion of the bolt 20, so that the fixing portion 2 is fixed to the flange portion 4B of the main beam 9.
Attach 2. In this case, the mounting position of the seat 12 is adjusted by the clearance between the bolt hole 10 and the bolt 20 formed in the flange portion 4B. Next, the flange 4
B and the opening 22 provided in the fixing portion 22
c and the insertion hole 17 of the receiving body 12 supported by the fixing portion 22 and the insertion hole 1 of the
5, the other end of the rod 6 is inserted through the nut, and a nut 18 is screwed into the inserted portion of the rod 6 and tightened, so that the sliding contact surface 14 of the stopper 13 slides against the receiving surface 16 of the seat body 12. Tension the rod 6 while doing so. After the tensioning work of the rod 6, the nut 18 is loosened by the lock nut 19.

If the length of the rod 6 is short due to a manufacturing error or the like and the nut 18 cannot be screwed into the rod 6 and fastened, as shown in FIG. Special filler plate 2 with a long hole reaching
3 is inserted with the bolt 20 in the middle, and the number of filler plates 23 is interposed between the mounting plate 22a and the flange portion 4B by an appropriate number to adjust the position of the stopper 13 with respect to the rod 6. The fixing portion 22 is bolted to the flange portion 4B. Note that a washer such as a washer that fits loosely on the bolt 20 may be used instead of the filler plate 23.

In addition, the work for applying tension to the rod 6 causes the
When the rod 6 is disposed substantially at the center of the second through hole 17, the rod 6 is swingably supported by the sliding contact surface 14 of the stopper 13 and the receiving surface 16 of the receiving body 12. Then, the assembly work is completed. However, if this is not the case, as shown in FIG. 3, a special liner 24 (or filler plate) having an elongated hole reaching the center of the disk is inserted with the desired bolt 20 inside. An appropriate number of liners 24 are interposed between the flange portion 4B of the main beam 9 and the fixing portion 22 so that the liner 24 is disposed between the flange portion 4B of the main beam 9 and the fixing portion 22 in the circumferential direction of the seat 12. After adjusting the mounting angle of the receiving body 12 with respect to the flange portion 4B so that the other end of the rod 6 comes to approximately the center of the insertion hole 17 of the receiving body 12, the above-mentioned desired angle is adjusted. The nut 18 is tightened to the bolt 20.

Further, since the receiving body 12 is formed in a cylindrical shape to reduce the contact area of the receiving surface 16 as compared with the conventional case,
The sliding resistance of the sliding contact surface 14 of the retaining 13 against the receiving surface 16 is reduced. For this reason, in the above-described assembled state in which the rod 6 is swingably supported by the sliding contact surface 14 of the retaining stopper 13 and the receiving surface 16 of the receiving body 12, a blowing force is applied to the roof slab 2.
When the roof slab 2 is deformed due to the snow load, seismic force, etc., and an eccentric force acts on the other end of the rod 6, the eccentric force prevents the receiving surface 16 of the receiving body 12 from coming off 13. As a result, the sliding surface 14 smoothly slides, and the center of the rod of the retaining 13 is automatically aligned with the axis of the rod 6.

In the above embodiment, the tension member is constituted by the rod 6, but it may be constituted by the wire 7. When the tension member is the wire 7, the end support of the wire 7 may be performed as follows. That is, although not shown, one end of the wire 7 is inserted into the casing pipe 8A and the casing pipe 8A
After the anchor head 8B is fixed to the anchor head 8B, the anchor head 8B is attached to the support bracket 4A provided at the lower part of the opening frame 3. Further, as shown in FIG. 4, after the other end of the wire 7 is inserted into the insertion hole 17 of the seat 12 and the insertion hole 15 of the stopper 13 provided on the flange 4 </ b> B of the main beam 9, respectively,
Insert the insertion part of the wire 7 into the casing pipe 8A,
It is fixed to an anchor head 8B integral with the casing pipe 8A. Thereafter, the coupler at the tip of the pull rod to which the jack is connected is connected to the anchor head 8B on the flange 4B side.
And the anchor head 8B is driven by jack driving. Then, the disk body is divided into two parts, and the divided filler plate 25 having a hole formed in the center is fitted on the divided surface with the casing pipe 8A as the center, and the anchor head 8B
A suitable number of filler plates 25 between
, The jack 7 is loosened, the wire 7 is loosened, the filler plate 25 is sandwiched between the anchor head 8B and the retainer 13 to maintain the tension of the wire 7, and the coupler is connected to the flange portion 4B side. From the anchor head 8B.

The fixing portion 22 is connected to the flange portion 4 of the main beam 9.
B is attached to the support bracket 4A side, but may be arranged on the opposite side. In this case, the same operation and effect as in the above embodiment can be obtained except when the length of the rod 6 which cannot be screwed and fastened with the nut 18 is short.

Further, the nut 18 is used to attach the retaining stopper 13 to one end of the rod 6, but the retaining stopper 13 itself may be configured as a nut.

[0025]

As described above, according to the present invention, two separate points in a steel structure are used as attachment portions for attaching both ends of the tendon, and one end of the tendon is fixed to one attachment portion. A receiving member having a concave spherical receiving surface is provided on the other mounting portion, and a retaining member having a convex spherical sliding contact surface is provided at the other end of the tendon member, and the sliding surface is provided on the receiving surface. In a tension member end support structure in which the contact surface is slidably contacted and the tension member is swingably tensioned, the seat body is formed in a tubular shape,
The receiving surface is formed on one opening end side of the receiving body, and a fixing portion that is fixed to the steel structure by a bolt and nut is formed on an outer peripheral portion of the receiving body, so that the receiving body is formed into a cylindrical shape. By forming, the contact area of the receiving surface can be made smaller than before. Therefore, since the receiving surface is easier to be formed on the receiving body than before, and the sliding contact surface that slides on the receiving surface is also easier to form than before, it is necessary to manufacture the receiving body and the retaining at low cost. Can be.

Also, unlike the conventional one which is directly welded and fixed to a steel structure, the receiving body and the fixing part are made into parts,
At the construction site, the seat can be easily attached to the steel structure at the fixing portion by the bolt and nut. At that time, the mounting position of the receiver can be adjusted by the clearance between the bolt hole and the bolt formed in the steel structure, and the fixing portion in the circumferential direction of the receiver and the steel structure can be adjusted. By appropriately adjusting the interval between the seats, the mounting angle of the seat can be reliably adjusted. Therefore, if the bolt hole is formed in the steel structure, the fixing operation of the tension member end can be performed more smoothly than before, and the operation efficiency can be improved.

Further, since the receiving body is formed in a cylindrical shape and the contact area of the receiving surface is made smaller than that of the conventional case, the sliding resistance of the sliding contact surface of the stopper against the receiving surface can be reduced. When an eccentric force acts on one end of the tendon,
Due to this eccentric force, the sliding contact surface of the retaining member slides smoothly against the receiving surface of the receiving body, and the tension member mounting center of the retaining member automatically matches the axis of the tension member. Therefore, it is possible to secure the angle following ability by the centripetal action without interposing the lubricant layer between the receiving surface of the seat body and the sliding contact surface of the retaining as in the conventional case.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view taken along the line AA of FIG. 1B, showing an end supporting structure of a tendon according to an embodiment of the present invention. (2) It is a right view of (1).

FIG. 2A is a cross-sectional view of a steel structure having the tendon end support structure shown in FIG. (2) is a plan view on arrow P of (1).

FIG. 3 is a cross-sectional view showing an inclined mounting state of a receiving body in the tendon end support structure shown in FIG. 2;

FIG. 4 is a cross-sectional view corresponding to FIG. 1 (1) showing a tendon end support structure according to another embodiment of the present invention.

FIG. 5 (1) is a schematic view showing an end support structure of a tendon according to a conventional example. (2) It is a principal part expanded sectional view of (1).

[Explanation of symbols]

 2 Roof Plate (Steel Structure) 4A Supporting Bracket (One Attachment) 4B Flange (Other Attachment) 6 Rod (Tensioning Material) 7 Wire (Tensioning Material) 12 Receiving Body 13 Detachment Stop 14 Sliding Contact Surface 16 Receiving surface 20 Bolt 21 Nut 22 Fixed part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/342 E04C 5/12 E04B 1/32 101

Claims (1)

(57) [Claims] 1. Two separate points in a steel structure are used as attachment portions for attaching both ends of a tendon, one end of the tendon is fixed to one attachment portion, and a concave portion is attached to the other attachment portion. A receiving body having a spherical receiving surface is provided, and a stopper having a convex spherical sliding contact surface is provided at the other end of the tension member, and the sliding contact surface is brought into sliding contact with the receiving surface. In the end support structure of the tendon material, which tensions the tendon material so that it can swing,
A fixing portion for forming the receiving body in a cylindrical shape, forming the receiving surface on one open end side of the receiving body, and fixing the receiving surface to the steel structure by a bolt and nut on an outer peripheral portion of the receiving body; An end support structure for a tendon material, characterized in that a tension member is formed.