With the continuous deepening of AutoCAD technology into the construction technology management of construction engineering, AutoCAD software is no longer a simple drawing tool, but a management software that can be used to guide engineering construction management. In the construction of the building, there will be many irregular structures, and these irregular structures have many problems in the construction process, the stakeout, the calculation of the engineering quantity, the collection and finishing of the engineering materials, etc., using traditional construction techniques. Dealing with these problems will cost a lot of manpower, material resources and time, and the precision and effect are difficult to meet the needs of modern engineering construction. The use of AutoCAD technology, the problems of the traditional process can be solved, and can achieve twice the result with half the effort. The tunnel is such an irregular structure. The tunnel project undertaken by our unit is very good for applying AutoCAD technology in tunnel construction, stakeout, engineering quantity calculation, engineering data collection and sorting, thus saving a lot of time, Material and financial resources. The following is the description of the management mode combining the construction technology of Manzhuang Xinzhai Tunnel and the AutoCAD technology of Yunnan Xiaomo Expressway in our unit.
AutoCAD technology and tunnel construction 1. AutoCAD technology and construction of the lofting tunnels The various processes are tightly connected, there are many parallel and cross-construction projects, and the working surface in the cave is narrow, such as poor airflow, poor air quality, infrared measuring instruments. The reflected signal is too weak and often cannot be measured. Measurement work is very important in tunnel excavation construction. It controls the plane, elevation and section geometry of the tunnel excavation and is related to the tunnel penetration. In order to meet the needs of measurement work, it is necessary to select the time when the key process face is less polluted, stop some secondary processes, and increase the exhaust air in advance to meet the measurement working conditions. If the measurement work takes too long, it will directly affect the project schedule and economic benefits. How to provide measurement results in a timely and accurate manner, the instruments and methods used have become an important factor. It costs hundreds of thousands to buy a tunnel cross-section instrument, which can only be used for tunnel section measurement. The investment is too big and the economic benefits cannot be well reflected. If the artificial hand-drawn section is used to determine the section size of the tunnel, since the tunnel structure is a closed curved wall lining, manual drawing has certain difficulty, and the data cannot be directly obtained. The precision of the measurement is not high and cannot meet the construction needs. And make full use of AutoCAD technology, according to the specific lining structure type of the tunnel, determine the specific size of the tunnel hole section. During construction, it is only necessary to use the horizontal distance of the tape to determine the size of the hole excavation. This saves a lot of time and money. The specific practices are as follows:
1. Divide the tunnel excavation size according to the type of lining. Because the tunnel consists of two parts: the arch wall and the inverting arch. According to the previous construction experience, controlling the excavation dimensions of these two parts can meet the tunnel tunnel excavation requirements. For the structure of the arch wall, the excavation width is determined according to a dimension of 0.5 m perpendicular to the center line of the design; for the portion of the invert arch, the excavation height is determined for each dimension of 1 m perpendicular to the design baseline direction. Thus forming an excavation size section, the specific excavation size, can use AutoCAD to draw the corresponding lining section, and then use AutoCAD attribute feature command to find the response data, or use AutoCAD annotation command to mark the excavation on the corresponding lining diagram data. (only one of the lining modes), when combined with the tunnel mid-line elevation, curve elements and AutoCAD drawing control section size control hole excavation section, it can solve the tunnel hole excavation size accuracy is not enough Over-excavation and under-excavation occurred.
2. The I-beam used in the initial support of the tunnel also requires AutoCAD technology to stake out the jacking size. Since the distance between the two axes of the bending machine taken during the operation is 1.95 meters, the jacking size is determined according to different lining types (only one of the lining modes).
2. AutoCAD technology and engineering quantity calculation Because the tunnel is a closed curved wall composed of several circles with different radius and radius, it takes a long time to calculate and recalculate the engineering quantity, and the calculation result It is difficult to be convinced and it is difficult to meet the needs of modern engineering construction measurement. Using AutoCAD technology can solve this problem satisfactorily according to the following method.
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