Combined with engineering examples, this paper expounds the technical management points of high-rise shear wall building construction, and puts forward corresponding management measures.
In the construction of high-rise shear wall building, technical management is an important link in the process of construction management, and the quality, cost, safety and progress in construction are closely related to technical management. Therefore, only by doing technical management well can we master the technical points of high-rise shear wall building construction.
This paper introduces the key points of technical management in the construction of high-rise shear wall building.
Determination of construction management objectives Generally speaking, the objectives of construction management of construction projects are mainly manifested in the following aspects:
Problems in design drawings must be solved in advance, so as not to affect the normal construction of building projects.
Division of the project must be detailed and targeted safety technical disclosure in advance.
The construction plan should be scientific, applicable and economical, and should be managed dynamically in order to optimize it in time.
Technical files should be completely collected, sorted out and synchronized with the project.
Actively promote and apply new technologies, new processes and new materials to make them a means to reduce engineering costs.
Management measures formulated to achieve the goal. In the review of construction drawings, the blue prints.the design and sign design changes, we should pay attention to the following aspects:
A, consult the construction drawings, a preliminary understanding of the general situation of the project, engineering practices, functions and the specific location of doors and windows.
Check the building size and elevation, etc.
Check the structural drawing again, check the size and elevation, and consider whether the reinforcement is reasonable.
Check the construction drawings and construction drawings.
Detailed construction scheme should be considered when examining drawings.
Communicate with designers in time.
In the construction of Jinghong real estate high-rise residential building, the construction unit found more than 80 drawing problems, corrected the mistakes in time, and avoided many unnecessary economic losses.
Technical disclosure should be accurate. The contents of technical disclosure of partial projects should be detailed, especially the treatment measures of key parts, construction precautions and engineering quality requirements should be clearly written.
Do a good job of communication with the foreman and the monitor of the labor service team to ensure the accuracy of disclosure.
The selection of construction scheme and the correctness of optimized construction scheme are directly related to the construction progress, quality and cost of the project, so the determination and selection of construction scheme has become the focus of technical management. In order to accurately determine the construction scheme of high-rise buildings, we must have a comprehensive understanding of the surrounding environment, construction progress and quality standards of the project, and constantly sum up experience, think hard and be good at breaking through, conceive several construction schemes, compare them and optimize their implementation. In the construction of Jinghong high-rise residential building, the following specific schemes are mainly considered.
Selection of earthwork excavation scheme According to the engineering characteristics and surrounding environment, the construction unit chooses large and small excavators to excavate in layers, and the soil at the top of the pile is about 5 000 m thick, using large crawler backhoe. The soil between piles is about 475 1m, which is relatively regular. Compared with manual excavation, simple manual excavation can improve work efficiency. According to the specific situation, determine the heading direction and heading route respectively; Using the arrangement orientation of CFG piles, the labor team made a special bucket, which improved the work efficiency.
Practice has proved that after the above scheme is adopted in this project, the earthwork excavation, pile breaking 1 20 1 pile (about 166 m), the construction period is 9 d, and the mechanical shift is 3 1 unit, which takes 405 working days, while the mechanical shift is 4/kloc-0.
The erection scheme of swivel platform The swivel platform of high-rise building is the most frequently used construction site, and its firmness and convenience are directly related to whether the project can be carried out smoothly according to the construction period. Through research, the project rejected the plan of using simple steel pipe fasteners to build a cantilever transfer platform. Instead, it used two No.8 channel steel as the main beam and No.8 channel steel as the special transfer platform, with the distance of 1 m, extending into the room 1.5 m, and the end and middle of the main beam were inclined with 16 steel wire rope, covered with bamboo frames, and welded with railings around.
The formwork scheme selects the project as a full shear wall structure, and the plane design is symmetrical with expansion joints as the boundary. The shear wall area of each floor is 3 600 1TI. In view of this situation, large steel formwork system is considered. This is superior to the small steel formwork system and bamboo glue formwork system in shortening the construction period and reducing the construction cost.
Therefore, this project decided to adopt a large steel formwork system, which is formed by welding the traditional steel back beam with a 6 mm thick steel plate surface.
When installing formwork in this project, corresponding technical measures are taken in detail, such as setting expansion joints and taking measures to ensure the cross-sectional size of the wall.
Expansion joint setting: the expansion joint in this project is 30 cm wide and 0.4 1 ti long, and the template is replaced by polystyrene board, and * * needs polystyrene board 235 1TI. In order to solve the problem of inconvenient operation, the through-wall bolts are connected by screws with threads on both sides, and the screws are welded with gaskets in advance, and then the gaskets are welded on the longitudinal bars of the large formwork installed at the expansion joints and fixed until the internal and external formwork of the wall is hoisted in place.
When demoulding, loosen the inner nut and rotate the screw, which is convenient and labor-saving.
Measures taken to ensure the section size of the wall: Spot weld 12 mm steel bar on the stirrup of the concealed column or the horizontal bar of the wall, and the length of the steel bar is 2 mm smaller than the thickness of the wall. The layout method is as follows: the vertical root is 15 ~ 20 cm away from the ground (i.e. the first stirrup), and the top is located at the top stirrup. Each large formwork only needs to be welded horizontally. This ensures the geometric size of the strengthened shear wall.
The collection and arrangement of archival materials mainly start from the following aspects:
Be familiar with the information and organize the catalogue.
Fill it out carefully and completely.
The collection shall be timely and accurate, and necessary written notice shall be given.
The "guarantee materials" section should be well understood and filled in correctly.
To establish a good data collection account, easy to find and use.
The information delivered to the owner and supervision unit requires the recipient to sign for it to prevent the other party from rejecting it afterwards.
In the process of data collation, if there is no corresponding prescribed form, there should be a data form suitable for this project.
As the key content of on-site technical management of construction enterprises, construction site visa should have corresponding methods, means and skills.
According to the past experience and the present situation of Shanxi construction market, the following issues should be paid attention to in on-site visa:
Familiar with and master the contract, specification, quota and construction drawings of this project.
Before you apply for a visa, you must first calculate the cost and prepare the calculation method of the actual visa.
If there is no corresponding subtitle in the quota, a fixed package price should be signed to prevent future troubles for future completion settlement.
When the number of visas is large, or involves visas with large cost adjustment, it is necessary to break them into parts and pay attention to the artistry of signing.
If the construction unit with irregular management refuses to sign for recognition, it shall establish a document service account and try to solve it tactfully.
As technicians on the construction site, we should fully understand the situation of both parties to the visa.
For rework projects caused by design reasons and the owner's reasons, visas should be issued in advance or within the specified time. If the other party refuses to sign, it is necessary to stop work in time and record the construction projects and parts in the form of pictures for future use.
For the handling of construction visas, the technical personnel, pre-settlement personnel and foreman of the construction enterprise should jointly handle them to prevent the occurrence of missing items and inability to price.
Actively promote and apply new technologies, new processes and new materials. It is particularly important to actively promote the application of new technologies, new processes and new materials in the construction of high-rise buildings. In the construction of Jinghong high-rise residential buildings, the following new measures were mainly adopted:
Used for cold-rolled twisted steel bars, electroslag pressure welding, bamboo glue molds, etc. , master the technical essentials, understand the important link of quality pre-control, that is, make technical disclosure seriously and in detail, so that workers can make clear the technical points, process standards and quality standards, and lay a good foundation for the smooth completion of various indicators of the project.
Application of new technology, new process, etc. , it is necessary to check and study the materials in detail in advance, master the operation essentials and precautions in construction in combination with the specific conditions of the project, and conduct detailed disclosure and appropriate training for on-site construction personnel. Such as plastering on the external wall insulation board, the common quality problem is surface cracking. In order to prevent this common quality problem, EC anti-cracking agent slurry mortar and polymer mortar are adopted, which not only improves the plastering technology of polystyrene board insulation layer of external wall, but also reduces the project cost.
The plastering process of polystyrene insulation layer of external wall is as follows:
Fix the polystyrene board of steel wire mesh frame firmly with the base (steel wire mesh must be added at the yin and yang angles and joints of polystyrene board).
Brush a layer of interface treatment agent on the insulation board.
65438 thick +0: 3 cement mortar as the base (cement mortar mixed with anti-cracking agent).
Thickness 1: 3 cement mortar leveling (cement mortar mixed with anti-cracking agent).
Thick polymer anti-crack mortar with a layer of glass grid cloth on the surface, compacted and polished (glass grid cloth is alkali-resistant).
Spraying exterior wall paint.
Conclusion In the construction of high-rise buildings, we must master the key points of construction technology management. Only by mastering various management points can we master the main line of construction. In addition, new technologies, new processes and new materials should be adopted to master the technical control difficulties such as verticality of high-rise shear wall buildings, flatness of shear walls and cracks in external walls, so as to save capital investment, reduce engineering costs and obtain greater economic benefits for enterprises.
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