The construction technology of three-dimensional variable size large cantilever prestressed bent cap is to ensure the structural size, quality and construction progress through a series of technical applications. The ...The construction technology of three-dimensional variable size large cantilever prestressed bent cap is to ensure the structural size, quality and construction progress through a series of technical applications. The support system adopts a new type of turnbuckle support, and the support system is stable;BIM Technology is used for modeling, collision inspection and construction rehearsal of structural reinforcement, prestress and geometric dimensions, and the data of reinforcement processing size and installation sequence are extracted;The processing platform for cast-in-situ reinforcement skeleton sheet has accurate geometric dimensions and high installation efficiency;The formwork is pre fabricated and trial assembled, and the installation alignment and size of the formwork are beautiful;The concrete pouring adopts the overall pouring construction technology to ensure the overall quality of the structure. Due to the gradual change of three-dimensional dimension, the vertical, horizontal and longitudinal dimensions of each reinforcement are different. Before reinforcement processing, the processing length shall be calculated and sorted and numbered. During reinforcement installation, stirrups shall be installed first, and then skeleton pieces shall be installed, and temporary supports shall be erected for the skeleton pieces. After the stirrups are installed, the skeleton pieces shall be placed. During reinforcement installation, the reinforcement in conflict with the prestress system shall be reserved according to the BIM technical model, adjust and install the conflict reinforcement after the prestressed system is installed;The formwork adopts modular processing and pre assembly, with beautiful linear appearance and excellent three-dimensional feeling;The concrete is poured intermittently and integrally in technical time to avoid construction joints and reduce the cost and time of secondary roughening. There is no dust and construction waste caused by secondary roughening, which shortens the construction period and saves the cost.展开更多
In the construction of cast-in-place bridge deck of prefabricated I-beam by pretension folding line method, I-beam is used as the main stress support, well-shaped support is used on the inner side, triangular stable s...In the construction of cast-in-place bridge deck of prefabricated I-beam by pretension folding line method, I-beam is used as the main stress support, well-shaped support is used on the inner side, triangular stable support is used on the outer side, temporary support and installation formwork are erected through walking operation platform, steel bar binding and cast-in-place concrete deck construction are carried out on the upper part of I-beam and formwork, the deck thickness is only 20cm, which meets the vehicle load requirements of city -A grade bridge BZZ-100 and reduces the dead weight of the structure. Compared with the common full framing, the framing used in the construction is convenient in construction, material-saving, simple in process and short in construction time. I-beam construction adopts factory processing and production. Formwork is uniformly made of shaped steel formwork. The prefabricated members have a beautiful appearance. Prestressing is installed and tensioned in advance to ensure the straightness of the prestressing and the accuracy of the position. The overall structure of the I-beam is light in weight, and the total amount of concrete used is small. Under the condition of reducing the dead weight of each span and ensuring the stress stability, the amount of concrete used is reduced, which is beneficial to environmental protection and material conservation. In terms of formwork support system, the support form of this process is easy to build, less material is used and the construction speed is fast. And the binding of the steel bars can be completed in a short time. In the concrete pouring project, the pouring speed is fast and the construction is simple.展开更多
文摘The construction technology of three-dimensional variable size large cantilever prestressed bent cap is to ensure the structural size, quality and construction progress through a series of technical applications. The support system adopts a new type of turnbuckle support, and the support system is stable;BIM Technology is used for modeling, collision inspection and construction rehearsal of structural reinforcement, prestress and geometric dimensions, and the data of reinforcement processing size and installation sequence are extracted;The processing platform for cast-in-situ reinforcement skeleton sheet has accurate geometric dimensions and high installation efficiency;The formwork is pre fabricated and trial assembled, and the installation alignment and size of the formwork are beautiful;The concrete pouring adopts the overall pouring construction technology to ensure the overall quality of the structure. Due to the gradual change of three-dimensional dimension, the vertical, horizontal and longitudinal dimensions of each reinforcement are different. Before reinforcement processing, the processing length shall be calculated and sorted and numbered. During reinforcement installation, stirrups shall be installed first, and then skeleton pieces shall be installed, and temporary supports shall be erected for the skeleton pieces. After the stirrups are installed, the skeleton pieces shall be placed. During reinforcement installation, the reinforcement in conflict with the prestress system shall be reserved according to the BIM technical model, adjust and install the conflict reinforcement after the prestressed system is installed;The formwork adopts modular processing and pre assembly, with beautiful linear appearance and excellent three-dimensional feeling;The concrete is poured intermittently and integrally in technical time to avoid construction joints and reduce the cost and time of secondary roughening. There is no dust and construction waste caused by secondary roughening, which shortens the construction period and saves the cost.
文摘In the construction of cast-in-place bridge deck of prefabricated I-beam by pretension folding line method, I-beam is used as the main stress support, well-shaped support is used on the inner side, triangular stable support is used on the outer side, temporary support and installation formwork are erected through walking operation platform, steel bar binding and cast-in-place concrete deck construction are carried out on the upper part of I-beam and formwork, the deck thickness is only 20cm, which meets the vehicle load requirements of city -A grade bridge BZZ-100 and reduces the dead weight of the structure. Compared with the common full framing, the framing used in the construction is convenient in construction, material-saving, simple in process and short in construction time. I-beam construction adopts factory processing and production. Formwork is uniformly made of shaped steel formwork. The prefabricated members have a beautiful appearance. Prestressing is installed and tensioned in advance to ensure the straightness of the prestressing and the accuracy of the position. The overall structure of the I-beam is light in weight, and the total amount of concrete used is small. Under the condition of reducing the dead weight of each span and ensuring the stress stability, the amount of concrete used is reduced, which is beneficial to environmental protection and material conservation. In terms of formwork support system, the support form of this process is easy to build, less material is used and the construction speed is fast. And the binding of the steel bars can be completed in a short time. In the concrete pouring project, the pouring speed is fast and the construction is simple.
