Construction is an important stage of putting a lot of manpower, material resources and financial resources into transforming the design scheme into physical products. In order to strengthen the management of construction activities, in the past ten years, China has improved the system of building laws and regulations, established a supervision system, and carried out "standard implementation" activities ... These major measures have created a good environment for engineering construction. In this atmosphere, how to carry out information management in the construction process and make the construction level go up a step is of great practical significance.
Computer technology is being widely used in engineering construction. There are many softwares available in design, cost and project management. Only in the construction stage, at present, the application of computer is limited to the low level of word processing and form filling, and the function of computer has not been fully exerted, which plays a role in the management and decision-making of construction process.
The organization, management and implementation of the construction process are all completed by people. People's quality, level, even temporary mood and attention will have an impact on the construction situation. If the design requirements, technical standards, process flow, relevant calculations, statistical reports and management experience of the project can be solidified into a standardized program, and with the progress of the project, this program can continuously provide corresponding information to guide the construction, so as to make up for the possible weaknesses or deficiencies of managers to some extent, reduce mistakes and keep the construction level at a high level. This kind of software can participate in all aspects of construction, which is a powerful guarantee to further push the construction to a standardized and standardized track.
Due to the complexity of engineering construction, it is very difficult to compile such software. Bored cast-in-place pile has strong concealment, and its engineering goal often needs to be determined in the construction process, so it is very difficult to implement engineering control. However, it has a mature technical process and complete specifications and procedures, so it has the requirements and conditions for developing and applying this kind of software. Through hard work, we have developed the "Auxiliary Management System for Bored Pile Construction", hoping to make a beneficial exploration on the information management of the construction process.
The auxiliary management system of bored pile construction is mainly composed of six parts. Their contents, functions and development are mainly introduced as follows:
First, the project goal setting:
This part includes design requirements, construction technical requirements and some contract requirements. These requirements constitute the goals that the project should achieve. They need to be recorded in the system before construction, as a standard and basis to measure whether all aspects of the construction process are qualified.
Due to the different geotechnical conditions in different places and the different expressions of design units, the design schemes of pile foundation engineering are various. In order to make a software adapt to various engineering situations, a lot of analysis and sorting work should be done before compiling the system, and the design parameters of different pile types and their relationships should be summarized and sorted out clearly, and the orderly input methods and sequences should be compiled. For example, the principle of determining pile depth in the system includes five ways: given pile length, given pile bottom elevation, according to rock-socketed depth, double control of rock-socketed depth and pile length, rock-socketed depth or pile length. At this time, the pile length and pile bottom elevation will be displayed immediately after selecting the method according to the design practice and inputting the numerical value.
When a project has more than two building shafting, the system can convert the coordinate values of different piles into a coordinate system. For the input of pile position coordinates, the system provides a variety of methods, which can be selected according to the design characteristics. Piles with the same pile type and cap type and regularly distributed (including linear distribution and circular distribution) can be input in batches. Therefore, not only the coordinate values of piles are calculated at one time, but also the pile number is compiled, and the relationship with design parameters is established. Because it is batch input, it not only speeds up the input speed, but also reduces the possibility of errors. The entered sheet piling station position can also be displayed on the screen. Once an error occurs, it is easy to observe and correct it in time.
After construction, in case of design changes, the project objectives can be adjusted accordingly.
Second, the site construction management:
This is the window for the system to contact the field management personnel, and it is also the platform for process management. During the whole construction process, the system records all the construction activities on site according to the data collected by the site management personnel, including the acceptance and test of equipment and materials, hole-forming and pile-forming, accidents and shutdown events. , and then automatically conduct a comprehensive inspection of each working procedure and various quality indicators, automatically form a report, record it in the construction log, and prompt the subsequent working procedures according to the principle of prior control. All kinds of materials and processes are equipped with relevant specifications for future reference. The system is also equipped with working condition distribution map and real-time state table, which can directly query the construction state of each pile and pile driver at any time.
The selection of all input items follows the following principles:
1, to fully reflect the design scheme with specifications and procedures as the main body and the implementation of various technical standards. For example, many reports do not reflect the actual diameter of steel bars. However, in actual construction, due to the substitution of materials, the design specifications may be changed unintentionally or intentionally. Requiring this value will draw attention to the project;
2. In order to meet the information requirements specified by relevant departments, such as the contents specified in the completion form, it should be collected, generated and stored in the database during the construction process;
3, can provide all aspects of data that need to be counted and analyzed in construction management. For example, in order to strengthen the management of construction progress, it is necessary to collect the occurrence time of various events on the spot;
4. The input should be the original data collected by the management personnel at the scene. Post-processing is completed automatically by the system to ensure the objectivity, truthfulness, accuracy and reliability of the data. Such as casing eccentricity, hole depth, cage top position difference, sediment thickness and so on. , all need to be calculated, and should not be filled in directly to reduce the error of intermediate links;
5. It is convenient for field personnel to use. Each step of the program design provides prompt information and default values of related items, which helps staff to avoid negligence in field work and makes the system easy to operate. Like the actual rebar diameter mentioned above, the design specification is the default value. If there is no change, you don't need to enter it separately.
Taking the final hole process as an example, this paper illustrates a series of system responses caused by a process input:
① When the dialog box appears, there is a default value of the time at that time. If it is close to the final hole inspection time, there is no need to change it.
② Enter the station number in the dialog box. If the station number is wrong or the previous procedure is not completed, a prompt will pop up.
(3) After the pile number is determined, a default value will appear for each input item. If these default values do not need to be modified, in general, the input can be completed by filling in the total length and remaining length of drill pipe.
④ After confirming the input content, the system will display the test results of quality indicators such as pile depth and pile diameter.
⑤ After approval, the system will display subsequent construction tips, including the specifications and length of the reinforcing cage, the amount of concrete to be prepared and the required first pouring time.
⑥ Automatically form a comprehensive and detailed process inspection report, which provides more information than manual report, and can be printed and submitted to the supervisor for inspection.
⑦ When exiting the dialog box, a line of records will be added to the construction log, indicating the inspection time, result, conclusion and explanation.
As can be seen from the above process, the system is strict in process management. As an after-the-fact control of quality, the system will judge whether the quality is qualified according to the requirements of design and specification, thus avoiding the possibility of mistakes. As a quality pre-control, each process provides a hint for the next step. The computer has given us a tool that makes it possible for us to really implement the pre-control measures that have been emphasized.
Third, the construction arrangement:
This part of the system has prepared a set of tools for the arrangement of various work in construction, including the calculation of pile position measurement and placement data, the matters needing attention in drilling, the matters needing attention in making reinforcing cages, the calculation of self-mixed concrete ingredients, and the optimization calculation of pile hole construction sequence.
In the cage-making notice, as long as the pile number and length of the given steel bar are entered, the reinforcement scheme of the steel cage will automatically appear. Especially for the cage with variable cross section, two different schemes will be listed, which can be selected according to the materials on site.
The optimal calculation of pile hole construction sequence of bored pile is based on the principle of skip and the shortest path of mobile machinery as the goal. According to the calculation results, the road map of machine transfer can be drawn and printed.
Four, weekly/monthly progress and statistics:
This part of the system mainly provides information for project regular meetings and monthly reports, and is also a platform for managers to obtain various statistical information. Including the pile formation in the last construction period, the statistics of quantities completed by each pile and each machine, the time-consuming statistics of each pile and each working procedure, and the statistics of various quality deviations of each pile. When making the construction plan for the new construction period, it can automatically calculate the breakdown of various quantities and the required amount of various specifications and materials. These data are the basis of mastering the engineering construction situation, scientific management and scientific decision-making.
In the statistical table of quality deviation, the value of each pile and each quality parameter deviating from the standard value is listed, from which the construction quality can be judged and treated.
Time-consuming statistics of each process section of pile are mainly used for schedule control. The table lists the drilling speed of each pile, drilling speed, man-hours spent in each process, accident downtime, time spent moving the machine, etc. The difference of construction efficiency between each pile and each machine provides the possibility of tapping the potential in progress. In addition, whether the project schedule is reasonable can also be reflected. The analysis of these data is more convincing than other methods, so it becomes a powerful means to optimize the construction progress.
After the completion of the project target, before the actual construction, the quantities to be completed in the schedule and the total amount of materials still needed can be used as the bill of quantities of the project budget.
V. Chart access:
The data input during the whole system operation can be found here in different categories, which can be used as the basis and reference for construction management, decision-making and cost settlement.
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