Design and construction method of mass reinforced concrete

Abstract

The invention relates to a large-volume concrete building design and a novel method, which specifically comprises the following steps of: completing the construction of a large-volume concrete building in a manner of assembling small-size concrete prefabricated parts which are produced in an industrialized manner on site; the reinforcing bars in the concrete prefabricated part extend out of all the end faces of the concrete prefabricated part, only the exposed reinforcing bars of the prefabricated part need to be connected into a whole at the adjacent positions of the prefabricated part on site according to the standard requirements of reinforced concrete reinforcing bar connection, and then concrete is poured at the connecting positions. The technology has the advantages that the problem of shrinkage cracks generated during mass concrete construction is thoroughly solved, the mass reinforced concrete building manufactured through the method is higher than a building manufactured through traditional concrete construction in quality, the problem of shrinkage cracks generated during concrete solidification is solved, and the construction quality is improved. And the construction efficiency of the large-volume reinforced concrete is greatly improved.

Description

Technical Field

[0001] The present invention relates to a new method for the design and construction of mass reinforced concrete. Technical Background

[0002] In civil engineering construction, whenever it comes to mass reinforced concrete construction, the following problems have always been faced:

[0003] 1. For mass reinforced concrete projects such as concrete dams, although the problem that a large amount of heat is generated during the solidification of the dam body concrete, resulting in cracks in the poured dam body, has been solved currently: The method is to lay pipelines inside the poured concrete, use the cold water circulating in the pipelines to take away the heat generated during the solidification of the concrete, and use materials such as fly ash to reduce the heat generated during the solidification of the concrete, or add liquefied nitrogen. Ensure that the dam body will not crack due to the difficulty of heat dissipation of the internal concrete. This method has effectively solved the cracking caused by the difficulty of heat dissipation of mass concrete during construction, but the construction cost is relatively high.

[0004] 2. The workload of tying steel bars on site is large, and a large number of steel bar workers with professional technical skills are required to tie steel bars on site, and the construction efficiency cannot be greatly improved.

[0005] 3. In particular, for pouring concrete of a huge volume with traditional methods, there is still no effective solution to the cracks generated by the volume shrinkage during the solidification of the concrete. As a result, there is a saying that "no dam is without cracks": that is, for all concrete dams, cracks generated by the solidification shrinkage of the concrete will appear on their surfaces. Although the shrinkage cracks have little impact on the quality of the building, some methods still need to be adopted to control the expansion of the cracks (this is one of the main tasks of dam body maintenance). In fact, the existence of this problem has always been a problem that the industry hopes to completely solve. But currently, there is still no effective solution to prevent shrinkage cracks in mass concrete construction. Summary of the Invention

[0006] The present invention relates to a new method for the construction of mass concrete buildings: This method not only overcomes the drawbacks of low traditional construction efficiency and complex on-site concrete pouring technology, but also effectively solves the problem of shrinkage cracks generated during the solidification of mass concrete.

[0007] The specific method is as follows: For the construction of mass concrete buildings, it is completed by the method of assembling small-sized precast concrete components produced in factories in layers on site: For all precast concrete components used for assembly, the internal steel bars protrude from each end face of the precast concrete components. On site, only the exposed steel bars of the precast components at adjacent parts need to be connected into one body according to the specification requirements of steel bar connection in reinforced concrete, and then concrete is poured at the connection part.

[0008] Since the precast concrete components produced in factories are small in size, their sizes can be controlled within the elastic range of their shrinkage. When producing precast concrete components, their formwork is designed to not restrict the solidification shrinkage of the precast concrete components, ensuring that the precast concrete components produced in factories do not have shrinkage cracks. When assembling precast concrete components, the distance between them is small, so the amount of concrete poured between them is small. Not only will it not generate a large amount of heat that is not easily dissipated and cause concrete cracking, but also there is no need to adopt complex cooling measures for the cast-in-place concrete. At the same time, due to the small distance between precast concrete blocks, when the cast-in-place concrete between them solidifies, its shrinkage size can be controlled within the elastic range of the concrete and basically no cracks will occur. Micro-expansion concrete can also be used to ensure that no shrinkage cracks will occur at the cast-in-place parts. The cast-in-place concrete makes the components connected into a whole through it.

[0009] The significance of this technology lies in: completely solving the shrinkage crack problem that cannot be solved in the construction of mass concrete. For the mass reinforced concrete buildings completed by using the method of the present invention, their performance is the same as that of the buildings completed by traditional concrete construction, meeting the technical requirements of "equivalent to cast-in-place", and at the same time solving the problem of shrinkage cracks that occur when concrete solidifies and that has not been solved in the industry so far. Moreover, it greatly improves the construction efficiency of mass reinforced concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the precast concrete component for assembling construction of the present invention.

[0011] Figure 2 It is a structural diagram of another precast concrete component for assembling construction of the present invention.

[0012] Figure 3 It is a schematic diagram of assembling precast concrete components into a mass concrete building of the present invention.

[0013] Figure 4 It is a schematic diagram of another assembling precast concrete components into a mass concrete building of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, the specific embodiments of the present invention will be specifically described in conjunction with the drawings:

[0015] Figure 1 The structure of the precast component of the present invention shown has the following characteristics:

[0016] 1. The steel bars inside the precast concrete component all extend out of each surface of the precast component, facilitating the welded connection of the steel bars extending out of adjacent precast components in the horizontal direction into one body with the help of tie bars.

[0017] 2. The concrete precast member has circular pits on it. The diameter of a section of the pit near the bottom is reduced. At the position corresponding to the pit on the lower surface of the concrete precast member, there are concrete support columns protruding from the lower surface. The end of the column has a taper corresponding to the pit, which facilitates positioning when the upper precast member is placed above the lower precast member.

[0018] 3. The precast member has through holes penetrating the upper and lower surfaces. Its function is that after the upper concrete precast member is installed, it is more conducive to pouring concrete between the upper and lower precast members, so that the upper and lower precast members and the poured concrete form an integral body.

[0019] Figure 2 Another structure of the precast member of the present invention shown has the following characteristics:

[0020] 1. The steel bars inside the concrete precast member all protrude from each surface of the precast member. Horizontally, the steel bars protruding from adjacent precast members in the horizontal direction can be welded and connected into one body with tie bars; the steel bars protruding in the vertical direction are welded to a perforated steel plate as a whole.

[0021] 2. The hole positions on the steel plates on the upper and lower surfaces of the concrete precast member correspond one by one, which is convenient for fixing the steel plates on the adjacent upper and lower precast members into one body with high-strength bolts. Since the steel bars in the upper and lower concrete bodies are welded to the steel plates as a whole, fixing the steel plates into one body means that the steel bars inside the upper and lower precast members are also connected into one body.

[0022] 3. The precast member has through holes penetrating the upper and lower surfaces. Its function is that after the upper concrete precast member is installed, it is more conducive to the pouring of concrete between the upper and lower precast members, so that the upper and lower precast members and the poured concrete form an integral body.

[0023] Figure 3 The installation schematic diagram of the shown concrete precast member has the following characteristics:

[0024] Assembly construction in the horizontal direction:

[0025] After welding the internal steel bars protruding from the side of the concrete precast member with tie bars, then cast-in-place concrete is used to fill the interval part between the building precast members. Therefore, this part forms an integral body: the internal steel bars have been connected into one body, and the segmented concrete precast members are also connected into one body by the cast-in-place concrete.

[0026] Since the amount of concrete poured in the interval part is small, the heat generated is not large. In addition, this heat is quickly absorbed by the concrete precast members around the pouring part and will not form high heat causing the concrete to crack;

[0027] In addition, since the amount of concrete poured in the interval part is small, only the length direction of the concrete in the interval part needs to be controlled within a certain range (the width direction does not need to be controlled), and shrinkage cracks will not occur when the concrete solidifies.

[0028] Vertical prefabricated construction:

[0029] Supported by concrete support columns, the space formed between the upper and lower concrete precast members can facilitate the welding together of the internal steel bars protruding from the upper and lower concrete precast members using tie bars. After the cast-in-place concrete fills the gap between the upper and lower concrete precast members, the upper and lower precast members can form an integral whole.

[0030] Figure 4 Another schematic diagram of the installation of concrete precast members shown is different from Figure 3 only in the vertical prefabricated construction:

[0031] Since the internal steel reinforcement has been welded to the steel plate as a whole, after the high-strength bolts pass through the holes in the upper and lower steel plates and the nuts are tightened, the upper and lower steel plates are connected as a whole, which actually ensures the connection of the internal upper and lower steel reinforcements as a whole. After the cast-in-place concrete fills the interval between the building precast members, the upper and lower concrete precast members are connected to form an integral whole.

Claims

1. A method for constructing large-volume reinforced concrete, characterized in that the construction is completed by assembling prefabricated reinforced concrete parts produced in a factory.

2. The reinforced concrete prefabricated part as claimed in claim 1, wherein the transverse and vertical reinforcements of the reinforced concrete prefabricated part extend out of the surface of the concrete.

3. The upper and lower surfaces of the reinforced concrete prefabricated part as claimed in claim 2: a groove with a reduced bottom diameter is provided on the upper surface of the prefabricated part; and a support column with a reduced end diameter is provided at a position on the upper surface of the prefabricated part corresponding to the position of the upper groove.

4. Another reinforced concrete precast part as claimed in claim 1, characterized in that: the horizontal and vertical reinforcements of the reinforced concrete precast part extend out of the surface of the concrete, and the vertical reinforcements are welded to steel plates located a distance away from the upper and lower end surfaces, and the steel plates have holes.

Images