This paper is selected from the discussion on the application of “combination of permanent and temporary” in the construction site
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The author is Li Zhonghan, and the unit is Gansu First Construction Group Co., Ltd“ The “combination of permanent and temporary” construction can reasonably allocate and utilize various resources through early planning, reduce the repeated waste of various materials, reduce the investment of unnecessary materials, improve the utilization rate of materials, and achieve the purpose of saving project cost“ “Combination of permanent and temporary facilities” is to combine the temporary facilities and permanent facilities in the project construction for one construction, so that some permanent facilities can be used directly in the construction, so as to achieve the purpose of cost saving
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I
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the embodiment of the combination of permanent and temporary in the construction, a part of the permanent facilities of the project and the temporary facilities involved in the construction shall be constructed at one time
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After the completion of the project construction, it can be directly put into use after partial transformation or no transformation, so as to achieve the purpose of use function
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1
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The content of permanent temporary combination “permanent temporary combination” on the construction site is generally divided into two categories: hydropower installation and civil engineering: (1) the “permanent temporary combination” of civil engineering generally includes the combination of permanent roads and temporary roads, the combination of outdoor facilities, the combination of enclosure, etc（ 2) “Permanent temporary combination” of installation works generally includes permanent temporary combination of fire water supply, floor lighting, municipal water supply and drainage, etc
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2 application example of permanent temporary combination a series of permanent temporary combination measures have been taken in the construction of a project undertaken by our unit, and good benefits have been achieved
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The specific permanent temporary combined construction facilities are as follows: (1) the permanent temporary combined construction of formal enclosure and temporary enclosure of the project
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Beijing No
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8 middle school covers an area of about 40000 square meters, and the length of all temporary enclosures reaches 760 meters
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At the beginning of construction, the project department actively communicates and coordinates with the construction unit and Design Institute, and defines its enclosure construction practices in the joint review of drawings; The 452m formal enclosure foundation and column with conditions shall be constructed first, the fence part shall be reserved, and the reusable color steel baffle shall be installed at its position
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This method combines the foundation of the formal enclosure and the temporary enclosure with the column forever and temporarily, meets the requirements of dust control in Lanzhou, creates favorable conditions for the early resumption of work, and the construction is formed at one time, saving about 120000 yuan; At the same time, some formal fences have been constructed, which also reduces the progress pressure for subsequent outdoor construction
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Permanent enclosure column construction combined with permanent and temporary enclosure construction (2) the football field and temporary material storage yard are combined with permanent and temporary construction
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The playground project is first constructed to the gravel cushion according to the outdoor drawings, which not only hardens the exposed earthwork, meets the requirements of “six 100%” for dust control, but also ensures the civilized construction; And as a temporary site as a material storage yard
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Playground design drawing playground seepage layer construction (3) the combination of on-site fire-fighting facilities and temporary water, the combination of temporary water and fire-fighting water on the construction site, and the sharing of main pipe and branch pipe
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In case of insufficient municipal water supply, fire water tank and variable frequency pump set shall be installed
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It not only meets the requirements of fire fighting on the construction site
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At the same time, the problem of construction water is solved
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Achieved the goal of killing two birds with one stone
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Fire water tank and variable frequency pump unit (4) isolation ditch cushion and floor scaffold foundation shall be constructed permanently and temporarily
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The teaching building and dormitory building of the project are designed for vibration reduction and isolation
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During structural construction, the construction of isolation ditch cushion shall be completed as the floor scaffold foundation for main structure construction
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The safety factor of the floor scaffold is improved to prevent uneven settlement and deformation of the scaffold body
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At the same time, it achieves the effect of beauty and dust reduction
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The design of isolation ditch cushion uses the effect of scaffold erection on the isolation layer
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2
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Requirements for the combination of permanent and temporary construction
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1
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Strictly control the material quality
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During the combination of permanent and temporary construction, the quality of materials used shall be strictly controlled
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The construction materials shall be in accordance with the material quality requirements of permanent facilities
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At the same time, it is necessary to avoid damage and pollution to permanent facilities during use, so the general water supply pipe is not used as permanent and temporary combined water supply
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2 do a good job in the preliminary preparation
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In order to realize the combination of permanent and temporary during the construction, the design intention and use function of the project must be familiar with
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On the basis of in-depth interpretation of the design, the planning and implementation of the combination of permanent and temporary construction are carried out
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Avoid hasty construction due to unfamiliar design
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Finally, the permanent facilities can not reach the designed use function, resulting in rework and waste
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3 grasp the key links in the construction process
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First, the main construction process must be strictly controlled, and all permanent temporary projects must perform the acceptance procedures
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Construction can only be carried out after passing the acceptance
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In the process of construction, there are many construction links, each of which has a great impact on the construction progress and construction quality of the whole project
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Therefore, in the specific construction, we should also pay special attention to the following two points: first, part of the system of the project under construction at this stage is subcontracted by Party A, that is, the temporary facilities need to be constructed after mobilization, However, most of the professional subcontractors enter the site late
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If this technology is to be adopted in the specific construction, it is necessary to effectively communicate with the supervisor, the owner and the potential subcontractor of Party A before construction, and leave relevant materials that can be proved in the process of communication, When the project is handed over later, it will avoid the occurrence of later handover wrangling
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Second, not the whole temporary system can realize the combination of permanent and temporary
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Therefore, in the process of construction, it is necessary to plan the transformation of temporary facilities to formal facilities, so as to avoid affecting the progress of project construction due to lack of connection
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III
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common problems of the combination of permanent and temporary construction the general problems of the combination of permanent and temporary construction are as follows: (1) the combination of permanent and temporary construction cannot be carried out on time due to unclear design（ 2) Construction cannot be carried out because some subcontractors cannot enter the site on time
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In view of the above problems, in the process of permanent temporary construction, it is necessary to plan in advance, communicate with the design in advance, and communicate and coordinate with the construction unit, so as to create conditions for permanent temporary construction
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Due to the demand for temporary water in the construction in progress and the requirements for safe and civilized construction, temporary fire control and environmental protection, we have higher requirements for temporary water, temporary fire control, construction land, dust reduction and flushing of vehicles entering and leaving the construction site, so we need to invest more in these aspects to achieve the expected purpose
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If we apply the permanent temporary combination system, we can not only solve the above problems, but also save a large amount of investment in facilities and speed up the construction progress, which can be described as “killing three birds with one stone”
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In the process of specific project construction, it is recommended to use “combination of permanent and temporary” in group projects and high-rise buildings, which can not only meet the needs of various temporary facilities at the early construction site, but also meet the requirements of green and civilized construction, so as to greatly reduce the construction cost and provide convenient conditions for the construction site on the basis of cost saving, Finally, it provides effective technical support for the construction of the project
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References: [1] Luo Shenghong
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Application and economic effect analysis of permanent temporary combination in super high-rise buildings [J], railway construction technology, 2017 (20) [2] Zhao Changwei et al
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Planning and design of permanent temporary combination of water supply system of Shandong Yimeng pumped storage power station [J], building materials and decoration, 2016 (09) [3] Xie Wenhui et al
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Green construction technology of permanent temporary combination of fire water supply system in building construction [J], construction technology, 2014 (25) [4] Kang Dong
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Adhering to the “combination of permanent and temporary” is a magic weapon for construction preparation [J], construction market and bidding, 2011 (18) [5] Zhou Xiaowen
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Application and discussion of sponge city concept in construction [J], Shandong industrial technology, 2018 (02) reward analysis of construction engineering Luban people exchange of construction engineering, daily selection, evening release, learning in fun, Common progress ↓ long press to identify and join the alliance ↓.
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