First, the process principle
The back bolt anchor slate adopts the patented technology of German Yu Hui company. The cone drill and special equipment can drill holes on the back of the stone to enlarge the bottom and ensure the accuracy of drilling depth and size. After the anchor bolt is installed in the cylindrical hole, the torque is diffused, so that the diffusion ring is opened and the hole bottom is filled, forming a convex combination. The anchor bolts install the slate to the skeleton through the connectors.
Second, the main points of operation
1, measuring unreeling. Check the datum horizontal line to determine the horizontal and vertical installation datum lines of the stone wall. According to the relationship between the frame diagram of the slate and the internal structure, the outline of the structure and the position of the joint plate are measured.
2, node board installation. The joint steel plates are 320mm× 140mm× 10mm, which are fixed by chemical bolts, and each joint plate is connected with the concrete structure through two anchor rods. The specification of chemical bolt is M 12× 150, and the drilling diameter is 14? Mm, drilling depth 1 10mm, which is longer than chemical hose 10mm? Mm-15mm. Boreholes should be perpendicular to the wall. After the hole is formed, the brush cleans the powder around the hole, and the air pump blows the dust out of the hole. The sealed end of the chemical hose faces the drilling hole and is inserted into the bottom of the hole. Put the anchor rod to be installed on the special coupling head, slowly rotate the anchor rod with an electric drill and push it into the hole, and then rotate it by 2? 3 s will do. After the chemical agent is completely cured, install the connecting steel plate. The nut is padded with a spring washer, and after the nut is tightened, the exposed thread of the anchor rod is not less than 2 buttons.
3. Frame installation. Column selection 80? Mm hot-dip galvanized channel steel, spacing1000 mm. The column is connected with the gusset plate through the connection angle code, and the connection angle code is welded with the gusset plate on three sides, and the weld length is 160? mm— 180？ Well, 6? Well, the connection angles are connected by galvanized bolts of columns, which are hung on the main structure. The upper fulcrum adopts a round hole, and the middle fulcrum or the lower fulcrum adopts a rectangular hole. The verticality shall be controlled within11000. The columns and beams are connected by galvanized bolts with connection angles. The position of the connection angle code must be accurate, and the corresponding group of connection angle codes are at the same horizontal height. The beams are made of special aluminum alloy profiles, and the installation sequence of beams is from bottom to top. After the installation of each row, the horizontal height and flatness should be strictly checked, and the horizontal height of two adjacent beams should not be greater than 1? Hmm.
4. Slate drilling. The slate is polished granite with imported Venus white hemp, with a thickness of 22mm. The main specifications are 1200mm×600mm and 1800mm×600mm. 1200mm×600mm standard slate is installed with four-point support, and the distance from the support hole to the edge of the slate is 1/5 of the side length, and the minimum should not be less than 100mm. 1800mm×600mm is slightly larger, and the slab is supported at six points. The distance from the original four-point support hole to the edge of the plate remains unchanged. Because the distance between the two supporting holes on the long side is large, a supporting point is added in the center of the two holes to increase the bending strength of the slate. The drilling equipment is imported SBN500 automatic drilling machine, which has high machining accuracy. Fzp1/kloc-0 /×19m6/6kt/3al interval stainless steel anchor bolt is selected as the back bolt, with drilling diameter of 1 1mm and bottom reaming diameter of 13.5? Mm, drilling depth 16? Well, after the slate is drilled, the holes should be cleaned in time, the board surface should be cleaned, and the laitance should be removed to prevent the board surface from being polluted by the infiltration of stone slurry.
5. Install the anchor bolts and connectors. Insert the anchor bolt without expansion force, press down the anchor bolt and rotate the nut, so that the diffuser ring expands and presses down the conical wall of the conical hole to form mechanical embedding. After the anchor bolts are fixed, install special aluminum alloy connectors on the anchor bolts.
6, stone plate installation. * * * Enjoy the lobby area of 266? M2, 7.8 meters high, spacious and bright, and the wall is 1800mm×600mm large stone slab. The walls of elevator halls and corridors on the first and second floors are made of 1200mm×600mm stone slabs. Slate, anchor and connector form an assembly, which is hung on the beam in layers from bottom to top. Pull the horizontal line to control the height of the floor, and hang the vertical line to control the verticality of the joint. Adjust the horizontal elevation and the clearance between the left and right facades through adjustment screw to make the groove width meet the design requirements, and then fix the connector on the beam.
Third, the quality control points
1, the column should be hung at the upper end, the upper fulcrum is a round hole, and the middle fulcrum or the lower fulcrum is hinged with the main structure through the long round hole, which is in an eccentric tension state. When the column support may produce large displacement, the supporting device suitable for the displacement should be adopted. The bolted connection of metal skeleton can have a certain relative displacement with the main structure.
2. Slate should have no defects such as collapse and dark cracks, and its overall dimensions should meet the design requirements.
3. The aluminum alloy profiles are in contact with different metal materials of hot-dip galvanized channel steel, and are separated by insulating gaskets to prevent electrochemical reaction.
4. After the chemical anchor is completely cured, the pull-out force should be tested on site, and the testing strength must meet the design requirements.
5, slate should be bending strength and radioactivity testing, test results must conform to the requirements of the specification.