by On the afternoon of January 6, Shanghai Construction Association organized precast building experts and leaders of Shanghai precast building industry base to carry out the first learning and exchange activity this year.
This activity successively observed phase IV of Zhuyuan sewage treatment plant and Huangyang Road Station of Shanghai rail transit line 14.
In the process of observation, everyone has a strong interest in the new cast structure system and precast assembly technology.
After observing the fourth phase of Zhuyuan sewage treatment plant and Huangyang Road Station of Shanghai rail transit line 14, Guo Yanyi, chief engineer of the Fourth Engineering Company of Shanghai Construction Engineering Second Construction Group, made a detailed introduction to the fourth phase of Zhuyuan sewage treatment plant in the exchange meeting.
Finally, fan Leilei, deputy chief engineer of CCCC Junpu construction technology (Shanghai) Co., Ltd., explained the prefabrication and installation technology of metro line 14.
Expanded reading: in the process of urban planning, construction and development of phase IV spdw system of Zhuyuan sewage treatment plant, urban sewage treatment, as an important management work, has an important impact on the future development of the city.
In June 2020, the construction of phase IV of Zhuyuan sewage treatment plant was officially started.
As an important water environment treatment project and a key project in Shanghai, after the completion of phase IV of Zhuyuan sewage treatment plant, it will become a rare super large sewage treatment plant in China, and the total sewage treatment scale ranks first in Asia and top five in the world.
The second construction group of Shanghai construction engineering group undertook the construction of section 1.5 of phase IV Project of Zhuyuan sewage treatment plant, located at 700000 M ³/ D.
the plant area (East plot) covers an area of 193000 square meters and the foundation pit area is 131000 square meters.
The specific contents include the construction of 700000 M ³ AAO biological reaction tank, advection secondary sedimentation tank, rainwater pump house, sewage pump house, carbon source dosing room, pipeline, box culvert and other structures within the scope of this bid section, and superstructure such as biological reaction tank, rainwater pump house, sewage pump house and carbon source dosing room.
The project was started in December 2020 with a contract duration of 730 days.
At present, the project is in the structural construction stage.
The use of precast assembly technology in urban sewage treatment facilities is an effective method to improve project quality, shorten construction period and reduce environmental impact.
The quantity of precast components in section 1.5 of phase IV Project of Zhuyuan sewage treatment plant has reached 18000 cubic meters.
However, the wall, slab and other components of large underground sewage treatment plant have large height, span and thickness.
If conventional cast structure is adopted, the precast components often weigh tens of tons, which is inconvenient for hoisting and installation construction, so it is difficult to give full play to the advantages of intensive and efficient prefabrication and assembly technology.
The hoisting of precast double-sided composite wall and the pouring of UHPC node at the bottom of precast double-sided composite wall are completed.
Aiming at the problems of large weight of precast structural components, difficult construction, poor construction safety performance and tight construction period of Zhuyuan sewage plant.
The backbone of the project team and the technical experts of the second construction group set up a project expert group to deepen the research and development of the original designed solid precast wall and precast slab into a new spdw structural system of “precast double-sided laminated wall + precast inverted T-shaped laminated slab” with the original intention of lightweight components, simplified node form and convenient construction.
The spdw structural system used in Zhuyuan sewage treatment plant project is fully called the new cast structural system of inverted T-plate combined with double-sided laminated shear wall, that is, the precast construction technology of connecting inverted T-plate and UHPC in precast double-sided laminated shear wall.
Its successful research and development solves the problem of component overweight caused by too high height and too large span of precast components, greatly reduces the weight of components, improves construction and hoisting efficiency, improves structural performance and reduces structural safety hazards.
In order to better assist the efficient construction of the underground sewage treatment plant, the project expert group and the expert team of Shanghai University of technology monitored the overall construction process on site, evaluated the process level of each construction stage, and verified the overall stiffness and strength of the structure through the 1:1 full-scale surcharge test of the system.
During the R & D period, the project expert group also organized industry experts to guide the project assembly system for many times.
Since the large-scale precast construction was officially carried out on September 5, 2021, 1704 members have been hoisted, accounting for 78%.
The precast wallboard of the on-site precast double-sided composite wall is also used as the formwork for the concrete pouring in the cavity.
At the same time, the concrete pouring in the cavity of the double-sided composite wall adopts the top unsupported operation frame as the operation surface, which saves a large number of construction period and cost of bent frame and formwork construction, making the project more efficient and economical.
The precast integral structure, while improving the construction efficiency and site utilization, takes the lead in piloting the prefabrication and assembly technology in the field of water engineering to ensure the project quality and control the project risk, which will accumulate important experience for the engineering application of prefabrication and assembly technology in the water industry in the future, It also provides a good reference for the promotion of industrialization and green public municipal construction.
Shanghai rail transit line 14 project station integrated assembly entrance and exit and wind combination project “double carbon” is a hot topic at present.
Especially this year, the central government and the State Council issued a series of policies, measures and guidance on realizing carbon peak and carbon neutralization.
Combing the relevant logic of double carbon, precast construction and precast decoration have obvious advantages in helping green design, green building and realizing green sustainable development.
Construction industrialization is one of the two major industries of Shanghai Aviation Administration, and it is also the characteristic basis for the development of Junpu construction science and technology.
Shanghai rail transit line 14 starts from Fengbang station in Jiading, Puxi, and ends at Guiqiao Road Station in Jinqiao, Pudong.
The line crosses the central area of the city from west to East, with a total length of 38.514km, all of which are underground lines..
