1. Importance of overlap specification
 The bonding specification of shotcrete mesh is a very important technical specification in shotcrete construction, which has an important impact on the installation quality and service life of shotcrete mesh. The lapping specification can ensure that the lapping between the shotcrete mesh sheets is firm and avoid the occurrence of cracking and falling off. At the same time, the lapping specification can also improve the service life of the shotcrete mesh, reduce the frequency of maintenance and replacement, and reduce the construction cost.
 There are three basic principles of overlap specification: first, the overlap length should be appropriate, and should not be too long or too short; Secondly, the lapping position should be reasonable, and should not be at the position with large impact force; Finally, the lapping angle should be correct to improve the firmness of lapping.
 In order to ensure the quality of lapping specifications, shotcrete construction personnel need to carry out strict operation procedures and technical requirements. The specific operation steps include: pretreatment of shotcrete mesh, preparation before lapping, lapping and fixing of shotcrete mesh, etc.
 2. Specific operation steps for bonding of shotcrete mesh
 First, the shotcrete mesh needs to be pretreated before it is lapped. This includes cleaning the surface, removing rust and applying preservatives. The purpose of pretreatment is to increase the adhesion between the shotcrete mesh and the base layer and improve the bonding firmness.
 Then, prepare for lapping. This includes selecting the appropriate size of the shotcrete mesh, determining the overlapping position and angle, etc. The selection of shotcrete mesh shall be based on the specific engineering requirements and performance indicators, and the lapping position and angle shall comprehensively consider the structural conditions and mechanical requirements.
 Next, carry out the lapping of shotcrete mesh. First, place the shotcrete mesh on the base according to the overlapping position, and then fix the shotcrete mesh on the base with steel wire or gusset plate. Pay attention to the rationality of the lap length, position and angle during the lap to ensure that the lap is firm.
 Finally, fix the shotcrete mesh. The shotcrete construction personnel can use welding, riveting or special fixing tools to fix the shotcrete mesh on the base course. The purpose of fixing is to increase the bonding force between the shotcrete mesh and the base layer and improve the bonding firmness.
 3. Influence of lapping specification on shotcrete mesh
 The lapping specification has a great influence on the shotcrete mesh. First, the bonding specification can improve the service life of the shotcrete mesh. Reasonable lap length and angle can reduce the cracking and falling off of the shotcrete mesh, and extend the service life of the shotcrete mesh.
 Secondly, the lapping specification can improve the impact resistance of the shotcrete mesh. The reasonable lap position can avoid the cracking and falling off of the parts with large impact force, and increase the impact resistance of the shotcrete mesh.
 In addition, the bonding specification can also improve the overall firmness of the shotcrete mesh. Reasonable lap length, position and angle can increase the bonding force between the shotcrete mesh and the base layer, and improve the overall firmness of the shotcrete mesh.
 4. Importance and future development of bonding specification for shotcrete mesh
 To sum up, the bonding specification of shotcrete mesh is a very important technical specification in shotcrete construction. The lapping specification ensures the installation quality and service life of the shotcrete mesh, and increases the impact resistance and overall firmness of the shotcrete mesh.
 In the future, with the continuous development of technology, the bonding specification of shotcrete mesh will be further improved and improved. For example, the application of new materials and technological innovation can be used to improve the bonding specifications and improve the performance and effect of shotcrete mesh.
 To sum up, the bonding specification of shotcrete mesh is of great significance for shotcrete construction. Shotcrete construction personnel shall operate in strict accordance with the overlapping specifications to ensure the installation quality and use effect of the shotcrete mesh.