JP3054364B2 - Bonding method of reinforcing steel plate and nut fixing plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining steel plates for reinforcement in a method of rolling up steel plates of a pier, for example, as one of the seismic reinforcement of a concrete pier, and a nut fixing plate used in the method.

[0002]

2. Description of the Related Art In the conventional steel sheet winding method, a steel sheet is wound around an existing pier, and a gap between the steel sheet and the pier is filled with a resin or non-shrink mortar to integrate the steel sheet and the pier to increase the proof strength. It is intended. In this case, the rolled steel plates are generally joined by welding from the outer surface of the steel plates.

[0003]

The above-described method of welding and joining steel sheets requires a lot of construction time as compared with fastening and joining of superposed steel sheets by bolts, and furthermore, a fire caused by sparks generated during welding, etc. Because of the worries and the need to finish the grinder, it is necessary to take measures against the scattering of iron powder generated in such a case.

When one-side bolts are used to join steel plates, the filling gap becomes large, which causes a problem that the cost increases. In addition, as a method of fixing the nut to the inner surface of the splicing plate, the nut is directly attached. There are a method of welding to a contact plate, a method of bonding a nut to an attachment plate with an adhesive, and a method of fixing a nut by putting a cap-type bracket on the nut.

[0005] When high-tensile steel or the like is used for welding the steel sheet, the high-tensile steel is altered or deformed by the heat generated by the welding. Also, if the nut is bonded with an adhesive, sufficient bonding strength cannot be obtained, and there is a risk that the creep of this portion will increase.When a cap-type bracket is used, this cap-type bracket is attached to the pier and steel plate. However, there is a problem that the gap of the filler is made small and the filling of the filler is hindered.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method of joining reinforcing steel plates according to the present invention includes a butt joining portion of reinforcing steel plates covering an object to be reinforced at an appropriate gap. When attaching the contact plates on the front and back, respectively, and when fastening these triple steel plates with a required number of bolts and nuts, hexagonal holes into which nuts to be arranged at predetermined positions can be fitted are provided in a thin plate, and these hexagonal holes are provided. The bottom of the nut inserted into the hole matches the inner surface of this thin plate,
A nut fixing plate is formed by providing a locking piece for preventing the nut from coming off the thin plate, and a nut fixing plate in which a nut is inserted into each of the hexagonal holes is attached to the inside of the inner contact plate. Then, the fastening bolt is inserted from the outside of the triple steel plate and screwed into the nut held on the nut fixing plate.

In the present invention, hexagonal holes into which nuts arranged at predetermined positions can be fitted are provided on the thin plate in a distributed manner.
When the bottom surface of the nut inserted into these hexagonal holes is aligned with the inner surface of the thin plate, a locking piece is provided on the thin plate to prevent the nut from coming off the thin plate to form a nut fixing plate.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a concrete pier having a rectangular cross section, and 2 is a reinforcing steel plate having a U-shaped cross section as shown in FIG. 1 to 3, a concrete bridge pier 1 is covered with a total of six reinforcing steel plates 2.

As shown in FIG. 4, the reinforcing steel plate 2 is attached to the concrete pier 1 with an appropriate gap S and a gap adjusting bolt 3 and an anchor bolt 4.

As shown in detail in FIGS. 5 and 6, the butt joints of the reinforcing steel plates 2 are attached to the front and back sides of the butt joints of the reinforcing steel plates 2, respectively. 2 is sandwiched between the attachment plates 5 and 6, and a bolt hole 7 is formed at a predetermined position of the triple steel plates 5, 2 and 6.

As shown in detail in FIGS. 5 to 8, a thin plate 8 having an area slightly smaller than that of the attachment plate 6 is cut on the inner surface of the attachment plate 6, and a predetermined position of the Hexagonal hole 1 into which nut 9 can be fitted
0 are distributed on the thin plate 8.

As shown in FIG. 8A, a long strip-shaped locking piece 11 is projected from the bottom of the hexagonal hole 10, and a short projection 12 is projected from the upper side of the hexagonal hole 10. Tongue pieces 13 are protruded from the other sides of the hole 10, respectively. These tongue pieces 11, 12, and 13 are bent 90 degrees as shown in FIGS. The tip 11a of the piece 11 is bent further upward so that the bottom surface of the nut 9 inserted into the hexagonal hole 10 matches the inner surface of the thin plate 8 and that the nut 9 does not come off the thin plate 8. The nut fixing plate 8 is formed.

The nut fixing plate 8 having the nuts 9 inserted into the hexagonal holes 10 of the nut fixing plate 8 formed as described above is welded 14 to the inside of the inner contact plate 6 (FIG. 5).
The reinforcing steel plates 2 adjacent to each other are joined by inserting the fastening bolts 15 from the outside of the triple steel plates 5, 2, 6 and screwing them into the nuts 9 held on the nut fixing plate 8. .

In the above-described manner, since the nut 9 is held by the nut fixing plate 8, the operation becomes very easy. When the bolt 15 is screwed in, the hexagonal hole 10 of the nut fixing plate 8 can prevent the nut 9 from rotating together. Also, since the nut fixing plate 8 is not bulky, it also hinders the filling of the filler. There is no danger. Therefore, if the concrete pier 1 is surrounded by the reinforcing steel plate 2 as described above, a filler such as cement-based non-shrink mortar is filled in the gap S (see FIG. 4) between the pier 1 and the steel plate 2. What is necessary is just to fill.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the dimensions of the present embodiment is as follows. The bolt 15 was a high tension bolt M22, and the steel plates 2, 5, 6, the bolt 15, and the nut 9 were all hot-dip galvanized.

[0016]

Since the present invention is as described above, there is no need to weld reinforcing steel plates as in the prior art.
Eliminating the need for measures to prevent sparking due to welding and scattering of iron powder by a grinder which is a finishing work. Further, according to the present invention, the construction cost can be reduced as compared with the case where one-side bolts are used, and there is no risk of deterioration due to heat even if high-tensile steel bolts are used, and the nut fixing plate is bulky. Since there is no gap, there is no hindrance when the filler is filled between the pier and the steel plate, and an excellent effect that the construction period can be shortened as a whole is obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a concrete pier reinforced according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

FIG. 6 is a view as viewed in the direction of arrow C in FIG. 5;

7A is a front view of the nut fixing plate of FIG. 6, and FIG. 7B is a side view of FIG.

FIG. 8A is a partial front view showing a state in which a hexagonal hole is removed from a mold, and FIG. 8B is a front view showing a state in which each protruding piece of FIG. (c) is a side view of (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete bridge pier 2 Reinforcement steel plate S Gap 3 Gap for adjusting gap 4 Anchor bolt 5, 6 Attached plate (steel plate) 7 Bolt hole 8 Thin plate (nut fixing plate) 9 Nut 10 Hexagon hole 11 Strip-shaped locking piece (projection) Piece) 12 short protruding piece (protruding piece) 13 tongue piece (protruding piece) 14 welding 15 bolt

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Shinetsu 2-24-3-408 Waseda, Misato City, Saitama Prefecture (72) Inventor Yoshiki Ota 867-8 Shimokobashi, Sakaimachi, Sarushima-gun, Ibaraki Prefecture Daimaru Tekko Co., Ltd. (56) References JP-A-8-35514 (JP, A) JP-A-7-332338 (JP, A) JP-A-62-144432 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) F16B 5/00-5/12

Claims (2)

(57) [Claims] 1. An attachment plate is applied to the front and back of a butt joint of a reinforcing steel plate covering an object to be reinforced at an appropriate gap, and these triple steel plates are fastened by a required number of bolts and nuts. Hexagonal holes that can be fitted with nuts to be arranged at predetermined positions are provided in a distributed manner on the thin plate,
The bottom surfaces of the nuts inserted into these hexagonal holes match the inner surface of the thin plate, and a locking piece is provided to prevent the nut from coming off the thin plate to form a nut fixing plate. A nut fixing plate having a nut inserted therein is attached to the inside of the inner contact plate, and the fastening bolt is inserted from the outside of a triple steel plate and screwed into a nut held by the nut fixing plate. Steel sheet joining method. 2. A nut used in the joining method according to claim 1.
Fixed plate.