2.1.1Technological Process for Site Execution 2.1.1.1 The Foundation Work
2.1.1.1.1Make the alignment—Plain concrete blinding, and make
curing—make the alignment—foundation reinforcement binding—set up the formwork—casting concrete—make curing, remove the form--lay the foundation wall, embed the pipes and what ever required—backfill, level the site
2.1.1.2 The Super-Structure
2.1.1.2.1 Make the alignment—set up the column reinforcement
steel –make the form work—cast the concrete—make curing, remove the form--fix the beam and slab reinforcement steel and the form —cast beam and slab concrete—make curing, remove the form—lay block work for the wall
2.1.1.2.1During the execution of the super-structure, reasonably organize the work force with the form work and concrete casting as the core. We will have our work forces of different trade to work continuously to avoid them from sitting idle. The project management will carry out the execution in a way as the assemble line works and various groups will work orderly and in turns. When the main structure is completed, block and brick laying for the walls will be executed from the ground floor to roof. Indoor decoration and exterior work may start in the early stage
in order to guarantee timely completion as planned.
2.1.2 The Method for the Main Items 2.1.2.1 The Earth Work
2.1.2.1.1The foundation of this project mainly consists of separate piers. The concrete volume of the foundation work is considerably large. The working procedures are numerous, the techniques are complex, high qualities are required and the time is pressing. So it is necessary to do well the pre-construction preparations, and to adopt effective technical and organizational measures so as to ensure the foundation work to be completed soonest possible with high qualities and thus creating favorable conditions for the super structure’s execution.
2.1.2.1.2 The excavation will be controlled as 20cm higher than the blinding bottom level and then the rest will be done manually. And the bearing layer of the soil is never to be removed. We will get in touch timely with the Client, the designing institute in case that the soil conditions do not comply with those in the soil investigation report or any accidents happen.
2.1.2.1.3 The soil for backfill will be piled up at site and the edge of the pile should be away from the foundation pit less than 3 meters.
2.1.2.1.4 It is imperative to invite those from the designing institute, the supervisor and other related units to check the work as
the excavation of the foundation pit is completed. The following work can not be started until the result of the said check is ok.
2.1.2.1.5 We will invite the supervisor and quality control unit to check the foundation work when the same is done. When the check gives ok, the backfill is to be carried out. The backfilling shall be done simultaneously both in and out of the foundation pit to avoid from the uneven side load. And compaction is made well.
2.1.2.2 The Moulding board Work
2.1.2.2.1 The dimensions of the moulding board shall be correct and surfaces even, having sufficient bearing capacity, rigidity and stability to reliably bear the weight of the concrete newly cast and its side pressure, and other load during the execution. The moulding board should be easy to be fit and dismantle. The moulding board work shall facilitate the reinforcement steel to be bound and fit, the concrete cast and curing. The moulding board work shall be made economically to the extent to satisfy the lifting demand and to reduce the joints with largest possible area.
2.1.2.2.2 The Adoption of the Moulding board System: The moulding
board work system is selected and decided as the following: firstly it should be advanced, reasonably economic and applicable; secondly, it should be of help in control the project quality and of benefit to the effect of fair face for the main structure; thirdly, it is low in cost
with less investment. All in all, we have to consider the economics and applicability and thus adopt the scientific and reasonable form work system. It is imperative to improve the design of the washers and the counter bolts so as to ensure the rigidity of the form but the cycles less than steel moulding board.
2.1.2.2.3 Scaffolds shall be mounted tightly before doing the form work. Before casting, it is imperative to check all the support if they are strong, and if the clips and clamps are properly tightened. When casting, those who have made the moulding board work have to be on the spot and watch the ongoing form work, check the supports now and then to see if there any movable or deformed, and mend in time if needed. It is also imperative to frequently check the crane hook, and see if the bolts and nuts are loose between the slant supports and the platform. Timely removal is needed if any happens.
2.1.2.2.4 When making the form work for RCC beam and slabs and their spans are more than 4 meters, the arch shall be made. If there is no specific requirement, the height of the arch shall be 1/1000-1/3000 length of the span.
2.1.2.2.5 When removing the form, neither big hammer is used nor other unreasonable ways. If it is difficult to remove the form, claw bar may be applied gently at the bottom. Proper distances shall be maintained between the form and the walls when lifting so as to ensure no breaks made
to the concrete faces, edges and corners.
2.1.2.2.6 When removing the side moulding board for beams, neither edges nor corners shall be broken. Concrete cubic for testing shall be kept with the same conditions to facilitate the removal of board at the correct time. The board shall not be removed until the cubic is as strong as 1.2MPA. Experiences to tell when 1.2MPA shall be gained during execution for different grades of concrete with various cement, on different temperatures and etc. Finally one can tell when to get 1.2MPA by his experiences.
2.1.2.2.7 The surfaces and joints of the board shall be cleaned immediately after the removal to ensure no stick occurs for the next casting. The board shall be repaired and cleaned after using. Remedies shall be made if any deform happens and parts shall be replaced, etc.
2.1.2.3 The Reinforcement Steel Work
2.1.2.3.1 It is a must to check and test the reinforcement steel
brought into site. The checking shall be made including: to check its marks, outlook and take random samples to be tested as per the present state standards. The steel can only be used until the check is ok.
2.1.2.3.2 Before fabricating, the steel bars shall be cleaned without any damage. Paint stains and rust shall be cleaned up before using.
2.1.2.3.3 In order to ensure the correct dimensions of the steel work, special tools like clamps can be made to control the same.
课程设计NEW-OFFICE-BUILDING-PROJECT
