Non-floor type bracket bearing shear pin and construction method thereof

Abstract

The invention discloses a non-floor type bracket bearing shear pin which comprises a main body; the head part of the main body is cone-shaped and the tail part of the main body is cylinder-shaped; and a pull rod hole which threads through the main body along the central axis is arranged inside the main body. The load transferred by the bracket is born by the exposed cylinder-shaped tail part of the shear pin; the shear pin is tightly nestled against concrete of a pier column; and the load transferred by the bracket is transferred to the pier column through the shear pin so that finally the pier column bears the stress and supports the bracket. The non-floor type bracket bearing shear pin has the advantages that the shear resisting section of a shear bearing device is increased and the support force is improved; the contact area between a bearing and supporting system and the concrete is increased; and damage to the concrete is reduced.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a non-floor bracket load-bearing shear pin and a construction method. Background technique [0002] At present, there are two types of similar bracket load-bearing systems: [0003] One type is to use the channels reserved through the concrete members, insert thick steel bars or special steel rods into the channels, and rely on the shear force of the thick steel bars or special steel bars to resist the load transmitted by the bracket. This kind of load-bearing system has many disadvantages : 1. If the load is large, the diameter of the required steel rod must be large, and the diameter of the reserved hole must also be large, which will affect the quality of the concrete member, the weight of the steel rod is also large, and the installation and removal operations are difficult; 2. Steel rods or thick steel bars The bending resistance is poor, for example, the steel rod has a ...

AI Technical Summary

Problems solved by technology

[0003] One type is to use the channels reserved through the concrete members, insert thick steel bars or special steel rods into the channels, and rely on the shear force of the thick steel bars or special steel bars to resist the load transmitted by the bracket. This kind of load-bearing system has many disadvantages : 1. If the load is large, the diameter of the required steel rod must be large, and the diameter of the reserved hole must also be large, which will affect the quality of the concrete member, the weight of the steel rod is also large, and the installation and removal operations are difficult; 2. Steel rods or thick steel bars The bending resistance is poor, for example, the steel rod has a large extension length, and the exposed part is easy to bend, causing the support system to be unstable; 3. Because the steel rod or thick steel bar is on the surface of the concrete, the concrete is concentrated in force, which is very easy to cause damage to the concrete. Component damage; 4. Due to the gap between the steel rod and the reserved channel, if the force on both sides of the bracket is asymmetrical, it may cause the elevation of the bracket on both sides to change, thereby affecting the quality of the project

[0004] Another type is to use the hoop at the top of the pier column, and use the friction between the hoop and the concrete of the pier column to resist the load transmitted by the upper bracket. This kind of load-bearing system also has many problems: 1. The weight and volume of the general hoop 2. The hoop is easily deformed during use and turnover, which affects the quality of use; 3. It is difficult to control the pre-tightening force of the hoop fastening bolts. Insufficient pre-tightening force will cause the hoop Instability, if an instability accident occurs during the use of the hoop, it is difficult to correct and remedy, and the concrete surface of the pier column will be damaged if the pre-tightening force is too large; 4. If the load difference between the brackets on both sides increases, it may also cause the hoop to fail. Stable; 5. After the hoop is installed and before it is officially used, it needs to go through strict preloading and other tests, which will increase the construction cost and the turnover period will be long

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