[China Glass Network] What are the construction techniques and processes of glass curtain wall?
1. Process flow measurement: steel structure positioning installation → fixed installation of connecting ear plate → installation adjustment of front and rear force cables → cable internal force detection and adjustment positioning → load cable installation adjustment → horizontal cable installation adjustment → grab point system installation → Glass installation → glass adjustment → decorative strip installation → clean glue → check.
2. After the steel structure is manufactured and installed, it is adjusted according to the actual situation on site and reported to the design institute for approval. In combination with the structural form, the component installation is constructed by a comprehensive installation method. The steel truss is properly transported in the factory as far as possible. The steel pipe of the project is cut by a five-dimensional automatic cutting machine. According to the three-dimensional computer diagram provided by the designer, the automatic cutting machine automatically cuts the spatial curve which is completely consistent with the connected main pipe according to the geometric information of the intersecting nodes. After the staking test is passed, the welding groove and the tire frame are prepared according to the process requirements. Before the truss is installed, the truss hinge support is positioned and installed. The hinged support is spot welded according to the placed grid line. After the adjustment and adjustment, the full weld is performed. After the upper and lower hinge supports are completed, the truss is installed.
The process of truss installation: truss production → assembly → welding → painting → lifting. Before hoisting, the actual position, size and deviation between the manufactured parts should be checked. The project department should study the solution and take temporary fixed measures before lifting.
3. Positioning and testing of cable and suspension rods The cable of this project is used as the horizontal truss of the curtain wall, and its installation is very important. The accuracy of the installation is high and high. After the ear plate is installed, the cable and the suspension rod are installed together. The accuracy of the installation and positioning of the suspended rod directly affects whether the glass can be installed according to the design. Affects the flatness of the glass curtain wall after installation, the width of the seam and the stability of the glass curtain wall. Therefore, for the installation sequence of the suspended rods, the adjustment accuracy, the pre-stress values ​​must be strictly regulated to effectively control the installation quality of the glass curtain wall.
1 The installation sequence is based on the lateral direction of the project, the characteristics of the vertical load-bearing cable, the installation sequence of the cable and the suspension rod, and the installation is strictly carried out according to the principle of “first up, then down, first horizontally and then verticallyâ€.
2 The installation of the transverse cable is lengthened by 1mm-3mm according to the length of the cable given by the drawing. Pass through the truss fixture system. In every 15 or 10 meters across the unit. Let the cable be free. After the installation of the horizontal cable of the curtain wall is completed, the adjustment is started. The adjustment sequence is first up and down, and the suspension lever is adjusted to the position by layer by the size control unit.
3 Vertical cable installation The vertical cable of this project is a load-bearing cable. After the lateral cable is adjusted in place. Connect the vertical cable, the vertical cable should be lengthened by 1mm-3mm according to the length given by the drawing before installation. Position the installation first and then lower the unit while adjusting the side. 4 Positioning and adjustment of the suspended rod During the installation of the suspended rod, the installation and positioning geometry of the rod must be checked. The front and rear cable lengths are strictly adjusted according to the size of the paper to ensure the perpendicularity of the suspended connecting rod and the glass plane. Adjustments are made to approve the center position of each of the suspended rods based on the unit control points. Make sure that the front end of each suspension bar is aligned with the glass plane. The entire flatness error is controlled at ≤ mm/5m. The "positioning head" is used to adjust the flying rod to ensure that the flying rod is positioned with the glass and the center.
5 Prestress setting and detection of the cable According to the calculation of the designer, the prestress value of the cable of the project is horizontally subjected to force F1=20KN, and the horizontal stability cable and the vertical load cable are both F2=10KN. Prestressed cable tensioning step: Firstly, after basically positioning the suspended rod and the cable, the prestressing value of the cable is applied to 50% of the cable internal force, and the positioning dimension is adjusted to balance the force. Apply to 80% of the internal force. After fine-tuning and meeting the design requirements, the 100% pre-stress value is tensioned. After the internal force is stabilized, the internal force loss of each truss is measured, and the over-tension value is determined to be over-tensioned. And holding the load 12H. When the tension is pulled, the internal force is relaxed and the internal force is relaxed to 100% of the pre-tension control value. The measurement is within ±5% error value. The horizontally stable cable prestress value is applied once in place. Then securely lock the node.
4. Grab the point system installation.
The installation of the grab point system is completed after the completion of all structural corrections. Firstly, the positioning point structure is installed according to the grabbing system partial map, and then the positioning size of each control unit and each piece of glass is again reviewed again, and the positioning size of the grab point structure is corrected according to the measurement result.
5. Counterweight detection Because the self-weight load of the curtain wall glass and other loads are transmitted to the main support structure through the suspended rod structure, in order to ensure that the deformation of the rod system is within the allowable range when the glass is installed after the structure is installed, it must be Check the weight on the dangling point.
A. The weight detection should be based on the weight of the weight set by the control unit to be more than 1.2 times the gravity load generated by the glass on the suspended rod. G weight = G glass × 1.2 ~ 1.5
B. The weight of the recording weight should be applied step by step. The deformation of the suspended rod should be tested once every level, until all the weights are applied to the suspended rod to measure its deformation. The deformation reset was measured after the weight was unloaded and recorded in detail.
In this project, two weighting tests are mainly carried out, and two units of BLMQ-1 and BLMQ-3 are taken respectively. The deformation of the structure after the suspension weight is measured to meet the requirements of glass installation accuracy.
6. Glass installation and control and injection molding 7. Glass installation and control 1) After the glass reaches the construction site, the surface quality and nominal length of the glass are 100% tested by the on-site quality inspector and the installation team leader. At the same time, the tempering of the glass was sampled using a glass edge stress meter. The glass installation sequence is first and then the next, and the installation is adjusted layer by layer.
2) Vertical glass transportation: a simple gantry crane temporarily set up on the scaffolding is used, and the electric hoist and nylon packaging belt are vertically lifted to the mounting platform for positioning and installation. The dimensional accumulation error is reduced throughout the process with a dimensional tolerance band of 3 mm in each control unit. 8. Gluing process control and testing 1) After the glass installation adjustment is finished, the glue is sealed to seal the gap of the glass.
2) The order of glue is first up and down, first vertical and then horizontal.
3) Note on the glue process: first clean the glass, especially the stain on the edge of the glass and the glue should be cleaned and dried. After the texture paper is applied, it should be glued within 24 hours and processed in time. The glue shall not have the phenomenon of overflow, burr, etc.; when the glue is used, the method of synchronously playing inside and outside of the double is used to ensure the filling of the rubber joint; in the process of scraping the glue, it is necessary to ensure the smoothness of the interface between the horizontal and vertical joints, if there is a protrusion Before the vulcanized surface is vulcanized, it is well-prepared to ensure smooth drainage at the glue joint; when the rubber is glued every other day, the glue joint is cleaned first, and the rounded head is removed to ensure that the two joints are tightly connected; If localized rubber defects (such as bubbles, hollows, broken seams, and severe surface cracks) are found in the self-test, the part must be removed and cleaned before refilling.
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