Content
Point cloud for high rise building
About hardware and software
About the nuances of scanning
About modeling
Conclusions
The engineering company Severin Development has been providing technical customer services for usa email list over 19 years, also acting as an EPC contractor at various industrial and civil construction sites.
Matvey Fetter, a BIM coordinator at the company, was one of the speakers at the March BIM breakfast dedicated to laser scanning in construction. In his report, he spoke about a very interesting and rather complex project: modeling utility networks for a high-rise building in the very center of the capital.
The project included major repairs and reconstruction of all utility networks of the Eurasia skyscraper of the Moscow-City International Business Center. The customer and owner of the building was interested in creating an executive model, i.e. a three-dimensional model of the “as built” category with reference to executive documentation. The facility itself is one of the first high-rise buildings in Moscow-City with an area of almost 200 thousand m2 and a height of 72 floors. The complex also has 5 underground floors.
Having described the project, the expert invited the BIM breakfast audience to first look at the results that Severin Development managed to achieve, showing both the object as a point cloud and a full 3D model of its utility networks. In total, more than 600 thousand unique elements of utility systems were modeled, the total weight of the model exceeded 10 GB, and the total weight of the point clouds was more than 16 TB.
BIM breakfast
According to the project implementation plan, it was necessary to detail both the architecture and the structure of the building, but the main emphasis was on the utility networks: ventilation and smoke removal, heating, refrigeration, fire extinguishing, water supply, sewerage, electrical and low-current networks.
About hardware and software
The initial data for the modeling were: laser scanning data, working documentation provided by the customer and panoramic photos of the object. The equipment used by the Severin Development team during the measurements was a Leica BLK360 laser scanner and a Trimble SX-10 electronic tacheometer. The VR 360 Ricoh Theta Z1 was chosen as a camera for panoramic shooting.
The BLK360 scanner is ideal for indoor surveys, but it has one drawback: it is not leveled. That is, if the floor surface is uneven, it will not be possible to set it exactly vertically. Because of this, stitching of several scans will occur with a large error. And in order to align the scans during stitching, Severin Development used the SX-10 tachymeter, with which they created a reference point cloud.
The software package consisted of the following products:
Signal Inspection is a product for digitalization of construction, one of the modules of which allows you to take photos, manage panoramic photos and view the history of shooting
ReCap and Cyclone - for registration, thinning and splitting scans
Revit - for modeling and filling attributes
About the nuances of scanning
Matvey Fetter said that the specifics of the project consisted of constant changes: in parallel with the scanning, repair and finishing works were carried out inside the building. Therefore, it had to be filmed several times, which increased the overall cost of the project. There were 3 iterations of filming: