1. Reinforcement construction technology.
there are five main aspects of steel bar construction.
first, the joints of steel bars. Steel bar joints need to adopt special connection methods, such as straight thread mechanical connection, for steel bars with different diameters in different situations according to design drawings.
second, steel bar processing, in order to reduce the processing cost, steel bar processing can be carried out in strict accordance with the requirements of the drawings by special personnel at the scene.
thirdly, steel bar binding, steel bar binding requirements should be strictly in accordance with the drawings, and factors such as quantity and size spacing should be accurately controlled, and at the same time, random inspection and re-examination should be conducted after installation.
fourth, column reinforcement construction, column reinforcement construction must be carried out on a safely erected scaffold. The joints shall be staggered at the intersection of the four corners of the longitudinal reinforcement, and the straight parts of the stirrups at the intersection of the longitudinal reinforcement shall be leveled at intervals. At the same time, the stirrups shall be tied and buckled into a figure of eight. In order to facilitate the overlapping of the upper reinforcement, the tool to be used is to collect the column hoop into a column hoop diameter.
Fifth, in the reinforcement construction of structural beams and slabs, before construction, the bent frame should be set up and the bottom formwork should be laid. At the same time, the specifications should be determined according to the design requirements, and the order of reinforcement binding should be determined. Stirrup joints should be staggered on two erect steel. Pay attention to the splayed connection of adjacent tie wires when binding the platform steel mesh.
2) formwork construction technology. Template construction technology mainly includes three aspects: frame column template construction, beam and platform template construction and stairwell template construction. Frame column formwork construction is mainly square columns and columns, and generally square columns are used. During construction, attention should be paid to the construction of column formwork and concrete pouring first, and then to the construction of beam and slab. Seven splints are generally used in beam and platform formwork construction, which can ensure the quality. At the same time, the spacing should be controlled in strict accordance with the design requirements to keep the platform flat, and different standards should be adopted for arching for different beam spans.
when laying platform formwork, measures should be taken to prevent concrete from leaking. After the wall formwork laying is completed, it should be calibrated and accepted. After the acceptance, the platform plate and beam bent frame can be set up and the bottom formwork of the beam platform plate can be laid. The bottom plate material of staircase formwork construction is made of seven plywood, the grating is made of wood blocks with different specifications, the full-house support is set up with 48 steel pipes for support, and the thick smooth formwork is used as the escalator tread plate.
3) concrete construction technology. The preparation of concrete should be made according to the different strength grades of concrete. In the process of concrete pouring, plug-in vibrator is used for tamping, and layered vibration is used. When vibrating, pay attention to the insertion depth of the vibrator to eliminate the seam between the two layers. At the same time, be careful not to let the concrete sink, and strictly control the vibrating time, neither too little nor too much.
when pouring concrete, pay attention to the position between the concrete and the steel bar, and do not trample on the steel bar and other embedded parts. When pouring the platform, attention should be paid to the uniformity of pouring to ensure the uniform stress of the bent frame. And pay attention to the smoothness of the surface, and finally need to use machinery for smooth grinding. After pouring, we should pay attention to the concrete maintenance in different periods.
2 Analysis of technical points of coal mine combined building construction
1) Strength control in coal mine combined building construction technology. The most important strength control in combined building construction technology is the control of concrete strength. Different construction time, different construction climate, different construction environment and other specific factors will have a great impact on the strength of concrete. To control the strength of concrete in building construction, the first thing is to control the correct proportion of concrete. After investigating the actual construction environment, professionals should make the proportion strictly according to the limit of concrete strength grade, and determine the proportion of concrete strength that really suits the current construction needs through repeated experiments, and at the same time, write a good proportion report.
During the construction, the contents of sand, water, cement and other materials in concrete should be added strictly according to the report requirements. Secondly, in order to control the strength of concrete, it is necessary to maintain the concrete effectively and appropriately. Pumped concrete with high efficiency, short construction period and sufficient mixing is mostly used in coal mine combined buildings. However, if the maintenance of concrete is reduced in order to shorten the construction period, the strength of concrete will be reduced and the building quality level will be reduced.
the maintenance of concrete needs to be carried out according to different construction environment and climate. In modern concrete maintenance, not only professional maintenance equipment and personnel should be equipped, but also detailed factors such as surface coverage and water source should be considered during maintenance. At the same time, the maintenance personnel shall be inspected irregularly to ensure that the concrete maintenance work is implemented. Finally, the problem of concrete strength control needs to be inspected and evaluated regularly according to the national "Standard for Inspection and Evaluation of Concrete Strength" after the construction, so as to ensure that the impact of coal mine work on concrete strength is minimized.
2) the control of the third line in the construction technology of coal mine combined building. The third line refers to the vertical line, process line and elevation line in the construction of coal mine joint building. The vertical line is an important index to ensure that the building is not inclined. It can effectively reduce the error to measure the verticality of the column after determining the corner column. Generally, the method of weighting the hammer with optical instrument is used to measure the verticality of the pouring concrete building. The application of process line is an important means to ensure the smoothness of the wall of coal mine buildings. The process line needs to be set at the top of shear wall and the waist of the outer plane, and after it is determined to be consistent with the template, concrete is poured, and then the outer wall and the periphery are combined with glued large plates before the shear wall is poured. The control of elevation line is to ensure the level of the combined building plane in coal mine, and the elevation line can be located by using a level or more than five holes.
3) Control of cracks in the construction technology of coal mine combined building. Cracks are common problems in concrete structures in coal mine combined construction, which will affect the construction period and the quality of the project. At present, there are two main ways to control cracks. The first is to fill and treat cracks when they are naturally deformed, and the second is to treat cracks when they can no longer be deformed. The treatment of cracks should be found and remedied in time, and it will have a great impact on the quality of building construction until the cracks form a certain scale. At the same time, some methods can be taken to prevent cracks, such as reserving expansion joints and separation joints.
In addition, reasonable selection of steel structure and light wall, and consideration of crack factors in the setting of indoor insulation layer are also methods to prevent and control cracks. Different coal mine buildings have different structures and different standards for controlling the width of cracks, so different measures should be taken to deal with cracks according to different building conditions. For example, when concrete masonry is carried out on the infilled wall, a part of the height can be reserved at the bottom of the beam, so that the concrete can deform and shrink, and then the vacancy in this place can be filled when the concrete is completely deformed.
At the same time, cracks should also be taken into account when mixing concrete, so as to test a more reasonable mixing ratio. Reasonable maintenance of concrete can also effectively prevent and control the generation and expansion of cracks. In high temperature weather, the water of concrete evaporates quickly, which makes the interior shrink and cracks appear, so in high temperature weather, concrete should be sprayed with water regularly for maintenance. If the area of concrete is relatively large, ventilation and heat removal can also effectively prevent cracks.
the control of technology and technical points in the construction of coal mine complex directly affects the construction quality of coal mine complex, and also affects the safety of coal miners working and living in it. Only by perfecting the construction technology of steel bar, formwork and concrete pouring, grasping the strength of each index and the standard of the third line in the construction and controlling the cracks can we really do the best in the coal mine joint construction under the modern new situation, effectively protect the safety interests of coal miners and make the coal mine cause in China develop vigorously and orderly.
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