First, the anchor bolts are arranged in groups according to the design size. Make a "template" according to the design size, and mark the position of the axis. Embedded in first group stand good for anchor bolt into the concrete inside the template, the "template" to the group made good on the anchor bolt, good location using the template theodolite, level, and the anchor bolt and steel bar and concrete with welding machine template fixed, fixed to ensure that when the relative position of the anchor bolts and concrete template.
Problems to be paid attention to during concrete casting: before concrete casting, the bolts must be wrapped with oilcloth to protect the bolts, and the bolts should be unwrapped when the steel structure is installed. In the process of concrete casting, avoid stepping on the formwork as far as possible, avoid directly touching bolts with vibrators as far as possible, especially avoid colliding with bolts. After the completion of concrete pouring to send someone to check the elevation of the top of the column, do not meet the requirements in the concrete first setting before rectification. The position of anchor bolts should be recalibrated before initial setting after concrete pouring is completed.
6, Base backfill
7, Compaction of edge
8, Knee brace connection
Preparation before installation
1, Check the documents, quality certificates, design changes, drawings and other technical documents.
2, Implement and deepen the construction organization design, and make preparations before lifting.
3, Master the external environment before and after installation, such as wind, temperature, snow, sunshine, etc.
4, Joint review and self-review of drawings.
5, Basic acceptance
6, Setting of backing plate
7, The grouting mortar is made of non-shrinkage and micro-expansion mortar, which is one grade higher than the basic concrete.
Elevation observation points and centerline marks shall be set. Elevation observation points shall be set with the supporting surface of the bracket as the datum for easy observation, and the legless column shall be set with the center of the last mounting hole connected with the top of the column and the truss as the datum.
When the center line mark should meet the corresponding requirements for multi-joint column installation, it is advisable to assemble the column and then lift it as a whole.
The steel column should be adjusted after hoisting, such as the deviation caused by temperature difference, sunlight side exposure and so on. After the column is installed, the allowable deviation should meet the corresponding regulations. After the roof truss and crane beam are installed, the overall adjustment should be made, and then fixed connection should be made.
For columns of relatively large length, temporary fixing measures should be added after hoisting.
Intercolumn supports should be installed after the columns are aligned.
Steel column hoisting
Installation of crane beams
This shall be done after the first column calibration of the inter-column bracing installation, starting from the inter-column bracing span, and temporary fixing of the crane beam after lifting.
Crane beams shall be calibrated after the roof system members have been installed and permanently connected. The allowable deviation shall be in accordance with the relevant regulations. The elevation can be corrected by adjusting the thickness of the backing plate under the column base plate. The connection between the lower flange of crane beam and the bracket should meet the corresponding regulations. The crane beam and auxiliary truss should be installed as a whole after assembly, and its lateral bending, distortion and perpendicularity should meet the requirements.
1.1 Inspect the c-type purlins that enter the site. Replace the purlins with those whose geometric dimensions are out of line or have been seriously deformed during transportation.
1.2 purlin installation, it must be perpendicular to the roof brace, make sure house purlin in a plane first roof purlin installation, welding roof poles, and then, in turn, the hole house purlin installation, roofing strengthen purlin, when installing a downhill purlin, must install brace, and move between tight, guarantee the purlin is not twisted, effectively prevent the compression of house purlin wing instability.
1.3 Check the geometrical size, quantity and color of the incoming roof panels, and replace them if they are seriously deformed or scratched in transportation.
1.4 The installation datum line is set, which is set on the vertical line of the roof ridge line at the end of the gable. According to this datum line, the cross section of each or several press-shaped steel plate is marked on the lateral line of the purlin to effectively cover the width positioning line, and it is laid in turn according to the row diagram, and its position should be adjusted while being laid. The roof ridge support plate should be installed first while being fixed.
1.5 During the laying of roofing pressed-steel plates, temporary pedestrian boards shall be set on the pressed-steel plates. Construction personnel must wear soft-soled shoes and shall not gather together.Temporary plate should be set up in the place where pressing steel plate frequently walks.
1.6 The roof ridge plate, flooded plate and roof pressing steel plate shall be connected with lap joint, the lap joint length shall be no less than 200mm, the lap joint part shall be equipped with water baffle board, waterproof plug and sealing strip, the lap joint length shall be no less than 60mm between the roof ridge plate, and the space between the joints shall be no more than 250mm.Fill the joint with sealant.
1.7 Longitudinal slope shall be paid attention to in the installation of gutter plate.