JPH024161Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection structure of bolts, nuts, and washers that can be applied to joints between columns and beams in buildings.

Generally speaking, a connection structure using bolts and nuts is widely used as one of the methods for connecting parts. Rainwater, dust, etc. enter the threaded part between the bolt and nut and corrode the part.

Therefore, as a measure to prevent various types of damage due to corrosion and fluctuations in torque values, in the field of buildings, when the steel frames that make up columns, beams, etc. During the process of actual construction work, rainwater etc. can enter the threaded parts of bolts and nuts and corrode the parts, so conventionally, the joint parts were temporarily tightened with temporary bolts and nuts before construction. However, after completing the necessary strain adjustment, the bolt and nut are removed, replaced with separately prepared bolts and nuts, and the joint is finally tightened. However, with this method, the temporary bolts receive the load of the steel frame and other members and become stiff, making it difficult to remove the bolts, making it time-consuming to replace the actual bolts, and making it difficult to replace the bolts. There were problems with the screw threads of these bolts being scratched, resulting in fluctuations in the torque value and re-occurrence of distortion in the entire steel frame, and improvements were expected.

The purpose of the present invention is to solve the above-mentioned problems by preventing rainwater etc. from entering the threaded part between the bolt and nut and preventing corrosion of this part.

A feature of the present invention is that a washer, a main nut, and a retaining nut for holding this nut are sequentially attached to the threaded portion of the bolt that passes through the members to be joined from the member side through each bolt insertion hole. A packing seat is formed by cutting out the inner periphery of the opening at both ends of the bolt insertion hole, and a packing seat is formed by cutting out the inner periphery of the opening at the end of each bolt insertion hole of the washer and retaining nut that face the bolt insertion hole. A packing is interposed between the opposing packing seats, and the threaded portion of the bolt and nut can be held watertight. Both packing seats in the bolt insertion hole of the main nut do not necessarily need to be provided as long as the watertightness of the threaded portion can be ensured.

An embodiment of the present invention will be described below based on the drawings.

Bolts 4 are inserted into bolt insertion holes 1a, 2a, and 3a that are provided in the beam steel frame 1 and connection plates 2 and 3 that connect the steel frame to the column steel frame, respectively, and communicate with each other. A washer 5, a main nut 6, and a nut 7 for holding the main nut are attached to the threaded portion 4a of the bolt 4 protruding from the connecting plate 3 in this order from the connecting plate side. At both opening ends of the bolt insertion hole 6a of the main nut 6, packing seats 6b and 6c are formed in a tapered shape around the entire circumference of the hole. A seal seat 5b similar to the seal seat is also formed on the inner periphery of the end opening of the bolt insertion hole 5a of the washer 5, facing the left seal seat 6b. A void is formed. Similarly, a packing seat 7b is formed at the open end of the bolt insertion hole 7a of the holding nut 7, facing the packing seat 6c. And between the packing seats 5b and 6b and between 6c and 7b, there is an O-shaped or C-shaped
A shaped gasket 8, 8a is interposed, respectively, to maintain the watertightness of the threaded portion between the bolt 4 and the nut 6.

Next, the connection work will be explained.

At the temporary tightening stage, the threaded portion 4a is tightened at the rear of the main nut 6.
Tighten retaining nut 7. In this way, the seals 8 and 8a are crushed by tightening, and there is no gap between the opposing seal seats 6b and 5b and between 6c and 7b. After that, after adjusting the distortion between the steel frames, leave the bolts 4 as they are, remove the washers 5, main nuts 6 and retaining nuts 7, remove the packings 8 and 8a, and then tighten the washers 5 and main nuts 6 again. Re-insert and fully tighten the main nut.
In this case, the washer 5 and main nut 6 may be replaced with new ones depending on the degree of damage. Incidentally, if the torque value is not affected, the gaskets 8 and 8a may be fully tightened with the gaskets 8 and 8a interposed as they are.

As explained above, the part where the bolt and main nut are screwed together is kept watertight by the seal on the seal seat, so even if the bolt is inserted into the member and the main nut is attached, rainwater will not enter, and therefore There is no need to replace the main bolt with the temporary bolt, the efficiency of construction work can be improved, and various problems such as torque fluctuations caused by replacement do not occur.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the present invention. 1... Steel frame, 2, 3... Connecting plate, 4... Bolt, 4a
...Threaded part, 5...Washer, 5a...Bolt insertion hole,
5b...Packing seat, 6...Main nut, 6a...Bolt insertion hole, 6b, 6c...Packing seat, 7...Holding nut, 7a...Bolt insertion hole, 7b...Packing seat, 8, 8a...Packing.

Claims (1)

[Scope of utility model registration request] A washer and a holding nut each have a packing seat formed by cutting out the inner periphery of the opening end on the nut side of the bolt insertion hole on both sides of the main nut that is screwed into the threaded part of the bolt that is inserted into the member to be connected. A structure for connecting bolts, nuts and washers in a building, characterized in that a packing is interposed between the open end of the bolt insertion hole of the main nut and the packing seat.