The correct installation steps and key points of the construction stop screw?

The correct installation steps and key points of the construction stop screw?

The installation quality of the waterstop screw directly determines the effect of the waterproof project,and it is necessary to strictly follow the process of"positioning→assembly→fixing→sealing",while controlling the details to avoid leakage hazards,the specific operation is as follows:

1.Preparation before installation:clarify the specifications and check the components

Matching screw specifications:Determine the length of the screw according to the thickness of the wall(including the thickness of the formwork,wooden square,and steel pipe on both sides)to ensure that the exposed length of both ends of the screw meets the needs of nut fastening(usually leave 3-5cm each);The specifications of the waterstop plate should meet the design requirements,the thickness should not be less than 3mm,and the diameter should be 3-5 times larger than the diameter of the screw(such asΦ12 screw withΦ40 waterstop plate),and the waterstop plate should be welded vertically with the screw,and the weld seam should be full without false welding or leakage.

Check the integrity of the components:check whether the screw is bent or damaged one by one,whether the welding of the waterstop is firm,and whether the matching nuts and gaskets are intact;If it is a three-stage waterstop screw,it is necessary to confirm that the specifications of the inner rod,outer rod and connecting sleeve match,and there is no looseness after connection.

2.Core installation steps:precise positioning and stable fixation

Formwork drilling and positioning:drill holes in the corresponding positions of the formwork on both sides,the hole diameter is 1-2mm larger than the diameter of the screw(convenient for threading the rod),and the drilling position should be arranged according to the spacing of the construction drawings(usually 30-50cm,determined according to the pressure of the concrete side)to avoid conflict with the wall reinforcement.

Threading rod and assembly:Thread the waterstop screw through the formwork hole on one side,pass through the gap of the wall reinforcement bar and then pass through the formwork hole on the other side,and ensure that the waterstop in the middle of the screw is at the centerline position of the wall(the deviation does not exceed 2cm)to avoid waterproof failure caused by the deviation of the waterstop.After threading the rod,the wooden square,steel pipe,and gasket are put on the outside of the formwork on both sides,and finally the double nuts are screwed on(the double nuts can prevent loosening after pouring vibration).

Symmetrical fastening nuts:when fastening,it is necessary to tighten symmetrically from the middle of the formwork to both sides,rather than tightening them on one side in turn,so as to avoid tilting caused by uneven force on the formwork;The fastening force should be moderate,and it is appropriate that the formwork is not loose and the screw is not obviously bent.

3.Key waterproof seal:block the leakage channel

Formwork inner sealing:Rubber sealing ring or waterproof tape is installed at the contact point between the screw and the formwork(inside),and the diameter of the sealing ring should match the hole diameter of the formwork to ensure a tight fit and prevent concrete slurry from leaking out of the gap to form holes.

Inspection and adjustment:After the installation is completed,check whether the screw positioning is accurate,whether the position of the waterstop is centered,whether the nut is tightened,and whether the seal is in place;If the waterstop is found to be offset or the seal is not tight,it needs to be adjusted or reinstalled immediately,and concrete pouring is carried out after confirming that it is correct.

4.Precautions after pouring

During the concrete pouring process,it is necessary to avoid the vibrating rod directly hitting the waterstop screw to prevent the screw from shifting or the waterstop plate from falling off;When removing the mold,only the exposed part of the screw is cut,and the screw section with a waterstop inside the wall is retained,and the screw hole needs to be specially waterproofed(such as cleaning the residue in the hole,injecting waterproof mortar,and pasting waterproof membrane)to completely block the hidden danger of leakage.