Section steel support and cover plate fabricated foundation for a frozen earth area.

A prefabricated, profiled steel technology, applied in infrastructure engineering, construction, etc., can solve the problems of large friction coefficient of concrete surface, limited bottom area of support section, displacement of concrete slats, etc., and achieve low surface friction coefficient and large inclination angle. , the effect of easy transportation and assembly

Active Publication Date: 2021-09-21

四川电力设计咨询有限责任公司

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AI-Extracted Technical Summary

Problems solved by technology

This method solves the problem of quick assembly of foundations in permafrost areas to a certain extent, but there are still some defects. First, although the support section with a hollow section can reduce the weight of the components to a certain extent, the support section of the concrete structure, It still has a large volume and weight, and it is inconvenient to transport and install. Second, the support section of the concrete structure has a limited bottom area, and its load transmission is mainly co...

Method used

As shown in Figure 1, many base plate laths 1 are placed on the foundation dug ahead of time by a certain distance, base plate connecting crossbeam 2 is connected on the base plate lath 1 to form complete base plate, the main material 3 tops of section steel support Converge and set the connecting seat plate 4 to facilitate connection with the tower foot plate, and the bottom of the main material 3 is dispersedly connected to the connecting beam 2 of the bottom plate, so that the load can be more evenly distributed on the bottom plate to achieve a better force effect . The components of the foundation are mainly base plate slats 1, base plate connecting beams 2, main material 3 of the steel bracket and some corresponding materials. It only needs to be assembled, and the overall engineering volume is relatively small.

In order to ensure that the quantity of supporting effect main material 3 is at least 3, in the embodiment as shown in Figure 1, the quantity of described main material 3 is 4, and the quantity of described bottom plate connecting beam 2 is 2 , two base plate connecting beams 2 are connected to both ends of the base plate slats 1 and are parallel to each other, and each base plate connecting beam 2 is connected with two main materials 3 respectively. As shown in the figure, the floor connecting beam 2 is dispersedly connected to the two ends of the floor slat 1, and the bottom end of the main material 3 is dispersedly connected to the two ends of the floor connecting beam 2, so as to ensure that the bottom of the steel bracket has a larger projected area , thus ensuring the stability of the support.

In order to facilitate assembly, between the base plate lath 1 and the base plate connecting beam 2, between the base plate connecting beam 2 and the shaped steel support and between the shaped steel support and the connecting seat plate 4, bolts are used, and the shaped steel support and The connecting part connecting the seat plate 4 is also welded with a connecting plate. At the same time, the shaped steel bracket and the bottom corresponding floor connecting beam 2 and floor slats 1 are connected in series by bolts. As shown in Fig. 2, the width of the floor slats 1 connected in series with the main material 3 of the shaped steel bracket is larger than that of ordinary slats, so as to ensure the supporting strength of the lower part.

Section steel...

Abstract

The invention relates to the field of electric power facilities, and discloses a section steel support and cover plate fabricated foundation for a frozen earth area. The foundation comprises bottom plate battens and a bottom plate connecting cross beam, the bottom plate battens are arranged in parallel, the bottom plate connecting cross beam is perpendicularly connected to the bottom plate battens, the bottom plate connecting cross beam is provided with a section steel support, the section steel support comprises at least three main materials, and the main materials form a conical structure. The bottoms of the main materials of the section steel support are connected to the bottom plate connecting cross beam in a scattered manner, the tops of the main materials of the section steel support converge and are connected with a connecting base plate used for being connected with an iron tower foot plate, and a cover plate is arranged at the periphery of the section steel support to form a conical structure with the periphery closed. The surface friction coefficient of the section steel support and the surface friction coefficient of the cover plate are both smaller than the surface friction coefficient of concrete. By the adoption of the foundation, frost heaving force generated by frozen soil on the foundation can be reduced, the construction period is short, and the stress performance is better.

Application Domain

Foundation engineering

Technology Topic

BattenFrost heaving +4

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Examples

Experimental program(1)

Example Embodiment

[0019] The present invention is further described below.

[0020] The present invention is disclosed for permafrost region steel support base cover panel assembly type, comprising a base plate and a bottom plate connected to a strip beam 2, a plurality of the floor slats are arranged in parallel, perpendicular to the base plate 2 is connected to the connecting plate cross an upper plate, the bottom plate connected to the cross member 2 is provided with a steel bracket, said bracket comprising at least three steel main material 3, and each main member 3 is formed obliquely tapered structure, the bottom 3 of the main material of the steel support connected to the dispersion the bottom plate connected to beam 2, 3 of the top of the main steel support member and connected to convergence for connecting the iron tower foot is connected to the base plate 4, the outer periphery of the steel support plate is provided with a cover 5 fully enclosed tapered structure is formed, the surface friction coefficient of said steel bracket and cover plate 5 are smaller than the coefficient of friction of the surface of the concrete.

[0021] like figure 1 , The multi-plate board 1 of the foundation at a certain distance from the ground dug in advance on the base plate 2 is connected to the cross member connected to the bottom plate 1 form a complete floor slats, three top of the main steel support member disposed aggregation and connecting base plate 4, so as to connect with the iron tower feet, the bottom 3 is connected to the main material are scattered on the base connection beam 2, the load can be more uniformly dispersed on the base plate, the force to achieve better effect. The base member main slat plate 1, the bottom plate connected to the cross member 2, the main material of the steel support 3 and some corresponding material, larger components are elongated strip-shaped configuration is very convenient to transport, transported to the installation site directly after the can be assembled, the whole project is relatively small.

[0022] Steel support individual susceptible to frost heaving force itself resulting dispersion instability, the present application by way of cover plate 5 is provided for forming a fully enclosed in the outer periphery of the tapered steel support structure, so that the entire steel stent suffered more frost heave force uniform. The greatest influence based on the stability of surface frost force (i.e., the tangential force heave), a base surface coefficient of friction has a greater impact force to the surface of the heave suffered, may be generally employed steel support angle, channel, or beam, etc., may be rolled or welded steel, the cover plate 5 can be surface friction coefficient of surface friction coefficient, such as sheet steel plate or a glass plate, and coated steel support plate 5 is less than concrete, can greatly reduce the freezing surface Effect of expansion force to the base. In addition, compared to steel support columns of concrete cone having a higher manufacturing accuracy, precision made steel support can generally be controlled millimeters, while the manufacturing accuracy of the concrete column is usually tapered can only centimeter. In order to ensure better web exert its effect, the height of the closure plate covering the bracket 5 from the top of the steel to frost depth at 0.5m or less.

[0023] The tower is connected to the connection tower foot base plate 4, so as to better bear the gravity base tower, the tapered configuration toward the center of the tower obliquely inclined tapered structure. Maximum angle suffered base surface angle superstrate heaving force is related to the surface in order to minimize the adverse effects of frost heaving force to the base of the cover plate 5 and the vertical direction is 30 ° ~ 50 ° . Wherein the best at 45 °.

[0024] In addition to the main steel support member 3, usually also need to set the appropriate auxiliary, connected between the primary timber 3, to ensure the stability of the 3 main material, auxiliary material 3 is determined according to the structure of the main, in the preferred embodiment of the present disclosure embodiment, the auxiliary member (6) and comprising a horizontal auxiliary oblique 7, the horizontal auxiliary frame 6 is connected to a horizontal-type structure is formed between the upper two adjacent main member 3, the auxiliary oblique end 7 member (6) is connected to the horizontal member 3 and the connection point of the main lower portion, and the other end connected to the bottom of the main diagonal member 3 adjacent. Such auxiliary structure more suitable for cone beam helical stent structure can achieve higher stability.

[0025] To ensure the effect of the number of the main support member 3 is at least 3, such as in figure 1 In the embodiment shown, the number of the main member 3 is four, the number of beams connecting the base plate 2 is 2, two floor beams connected to the base plate 2 is connected to both ends of a slat and mutually parallel, each Article backplane connector 2 are connected to the cross member 2 of the main material 3. , The bottom plate is connected at both ends in FIG. 1 is connected to the bottom slat dispersed beams 2, 3 and the bottom end of the main material and fragmented cross member is connected to both ends of the base plate 2 is connected to the bottom has a large steel support to ensure that the projected area , thereby ensuring stable support.

[0026] To facilitate assembly, the base plate 1 and the bottom plate connecting strip between the two beams, the base plate 2 and the connection between steel beams and steel support bracket and the seat plate 4 are connected with bolts, and the steel support connected to the seat plate further connecting portion 4 is welded to the connecting plate. Meanwhile, the steel support and a lower beam corresponding backplane connector strip 1 and the bottom plate 2 by a bolt chained together. like figure 2 , The bottom plate 3 slats strung together with the main material of a width greater than the steel support slats general, to ensure the support strength of the lower portion.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good mechanical performance
Easy to transport and assemble

Section steel support and cover plate fabricated foundation for a frozen earth area.

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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