1. B.O.B elevation and breakpoint position of each column. Before expanding the detailed drawing, a column schedule should be compiled to control the column specifications and breakpoints of the whole project.

2. T.O.S and t.o.c. elevation of each floor. Pay attention to the height difference on the same floor.

3. Sort out the specifications and materials of all section steel used in the project. For specifications that cannot be bought in the market, the owner should be informed to change the specifications in time.

4. Organize the joint forms used in the project. Special attention should be paid to beams of the same specification connected under different conditions on different floors.

Pay special attention to some structural engineers who think they are experts. )

5. Stair side plate position and joint. At the same time, pay attention to whether the clear height of the platform does not meet the specification requirements, and ask questions in time to avoid subsequent revision of the drawings.

6. Review the welding forms used in the whole project. Welding is the most important place for steel structure engineering quality control, and a good welding form is a good way to save manufacturing cost.

If you are not qualified for this job, you should ask the seniors in the manufacturing department.

7. If the internal climbing tower crane is used, attention should be paid to the location of the tower crane area and the tower crane reinforcement method. Tower crane regional components should be installed first, pay attention to the drawing order.

8. Pay attention to the position and thickness requirements of the partition and upper and lower sealing plates in the box column. And the technical requirements of vertical electroslag welding of internal partition wall.

9. The location, size and reinforcement method of beam perforation.

10. Connection between peripheral prefabricated curtain wall iron pieces and steel beams.

1 1. Location of reinforcement connectors for underground steel columns and reinforced concrete beams.

12. Nail planting requirements for each layer.

Two. Workshop steel structure

1.b.o.b. elevation and column drawing.

2. The cornice and roof elevation of each district.

3. Sort out the specifications and materials of all section steel used in the project. For specifications that cannot be bought in the market, the owner should be informed to change the specifications in time.

4. Organize the joint forms used in the project.

5. The elevation of the crown rail top and the position of the track center line, so as to calculate the elevation of the crown beam and bracket.

6. The relationship between crown beam or crown beam truss and crown beam, walkway slab and main column.

7. Are there any special requirements for the welding of support and main column?

8. Whether the distance between the roof beam or truss and the crown beam meets the requirements of the clear height of the crown.

9. The location of the wind column. Usually, it should be aligned with the outer edge of the main column.

10. The position of the first purlin and the last purlin. Check whether the first purlin conflicts with the anchor bolt. The last wall purlin should match the elevation of the gutter.

The first house purlin and the last house purlin have similar considerations.

1 1. Layout position of diagonal braces on the roof and wall.

12. Setting of purlin tie rod and horizontal brace.

13. The edge of the opening of the color plate is closed. Generally speaking, angle steel or purlin should be arranged at the edge of the color plate, which is unlikely to cantilever the color plate.

14. Location and edge of doors and windows.

15. Should all kinds of industrial equipment be reserved for the main structure?

16. Installation of ladder.

Light steel factory buildings are generally not too complicated. The heavy equipment workshop is relatively complex, and its huge volume and complex structure are sometimes daunting.

Three. Bridge steel structure

I am not good at the manufacture and installation of bridges, but as far as detailed drawings are concerned, the following aspects should generally be considered.

1. collate the data of each control point of horizontal curve and vertical curve. Check the data of each control point before the subsequent work. Although the data of control points in general design drawings can't be wrong, this data is very important, so it's better to check it to avoid future work in vain.

2. Calculation of stress-free line type. The constructor can calculate the "n, e" coordinates, elevation, azimuth, longitudinal slope, superelevation and pre-arch value of any mileage position.

3. Calculate the three-dimensional shape of box girder or plate girder by numerical method and develop it into 2D graphics. There is no way to expand the true 3D theoretical shape of the beam in the complex curve position into 2D graphics.

So we should use numerical method to approximate. Of course, the error in approximation should be controlled within the manufacturable range.

The above is the work to be done in the case of multiple alignment.

4. Setting of grouting holes and air holes of anchor bolt frame.

5. Mileage of each pier, "N, E" coordinates, and floor elevation.

6. The setting of the rib in the pier and whether there is welding between the internal partition and the rib.

7. Continuation of pier or joint formwork and capping beam.

8. Hat beam. The most complicated component in steel bridge. Similarly, in the case of complex lines, the theoretical shape of the top surface is not made by semi-method.

Can only be replaced by an airplane. At this time, the joint error with box girder or plate girder is large. The end of box girder or plate girder must adjust its shape according to this error.

The inside of the capping beam is also quite complicated, and the position relationship of internal partitions, ribs, vertical stiffeners, manhole stiffeners, etc. It should be clarified whether they are penetrated or welded.

9. plate beam. Then the 2D graphics calculated above are partially edited. Plus end joints, longitudinal stiffeners, transverse support (transverse frame) combination, horizontal diagonal support joints, shear studs, etc.

10. Box beam. Ditto. In addition, rib joints, internal partitions, manholes, etc. should be considered.

1 1. Transverse frame. According to the different superelevation of each road section, lofting shall be carried out, and whether it is connected with the pipeline support shall be considered.

12. Horizontal braces. It is necessary to calculate the three-dimensional coordinates of the end point of each diagonal brace with a linear calculation program, and then determine its length by combining the lofting data of its terminal plate.

13. Cross beam and longitudinal beam. The substructure between long-span box girders.

14. Other miscellaneous items. Pipe support, maintenance ladder, etc.

Bridge steel structure is the most difficult type. Error analysis in numerical method should run through the whole calculation process. A detail designer should have a strong 3D concept.

Four. Truss venues:

1. The lofting control line of arc roof shall be determined as soon as possible.

2. When constructing arc bars, try to construct 2D arc bars instead of 3D arc bars (such as spiral bars).

3. The breakpoint position and connection mode of the upper and lower chords (truss nodes should be avoided). The upper and lower chords of long-span trusses often use high-strength materials, which need to be ordered in advance. You should ensure that the breakpoint position is correct, so as to avoid the trouble of subsequent nodes.

4. Bearings and anchor bolts. Usually, one end of the truss will be a movable support, so pay attention to the structural form of its nodes. Anchor bolts are usually high-strength anchor bolts, and their extension length also has special requirements.

5. Truss web. Usually, the web members at both ends of the truss are thick in the middle and thin in the middle. Be careful not to use the wrong specifications.

6. Upper chord horizontal brace. Its position and nodes are the most difficult parts in the arc truss, especially when the roof is not a regular cylinder or sphere. When adjusting the local coordinates of components, there is an align command in StuCAD, which has helped me a lot in the projects I have done.

7. The upper chord of truss usually has 8 to 12 members at the horizontal support nodes. When discussing with the architect, pay attention to simplifying the connection method as much as possible. Pay attention to whether there is any fitting problem when modeling.

8. When the lower chord has a service road, it is 8. Truss, pay attention to its connection with the sidewalk, whether it conflicts with the web member.

9. Attention should be paid to the welding method of the joint of the square tube truss. Discuss the maximum allowable deviation value of welding working point with the constructor.