Fabricated composite bearing platform foundation

Abstract

The utility model discloses an assembly type composite bearing platform foundation which comprises a bearing platform, a PHC foundation pile and a spiral anchor foundation, the PHC foundation pile extends in the vertical direction and is detachably arranged below the bearing platform so as to support the bearing platform, and the spiral anchor foundation comprises an anchor rod and a spiral anchor disc. The anchor rod extends in the vertical direction, the upper end of the anchor rod is connected with the bearing platform, and the spiral anchor disc spirally surrounds the peripheral face of the anchor rod in the vertical direction so that the anchor rod foundation can support the bearing platform. The assembly type composite bearing platform foundation has the advantages of being convenient to construct, economical, environmentally friendly, high in bearing capacity and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of power transmission tower foundation technology, specifically, a kind of fabricated composite pile cap foundation. BACKGROUND

[0002] In power transmission line, power transmission tower often needs to cross complex geological conditions, such as large river, mountainous area, etc., the foundation of these areas may have uneven settlement, soft soil layer and other problems, pile cap foundation can adapt to these complex geological conditions through its larger contact area and stronger bearing capacity, to ensure the stability and safety of power transmission tower.

[0003] In the related art, pile cap pile foundation adopts cast-in-place concrete structure, with long construction period and high construction difficulty. UTILITY MODEL CONTENT

[0004] The utility model is made based on the discovery and understanding of the inventor on the following facts and problems:

[0005] In the related art, the anchor rod of pile cap spiral anchor foundation is prone to failure in dry-wet alternating soil, and the geological conditions need to be considered when selecting spiral anchor foundation, and the length of anchor rod should be shortened as much as possible. Secondly, the application range of spiral anchor foundation is limited, such as difficult to bear large load, low stiffness, weak horizontal force resistance, easy to deform, affecting the stability of the structure, not suitable for water accumulation or flood area. When the bearing capacity is insufficient, lengthening the anchor rod or increasing the diameter of the anchor plate will increase the bending moment, leading to deformation. Thirdly, although thickening the anchor rod can improve the bearing capacity, the cost increases greatly, the transportation and construction difficulty increases, and increasing the number of anchor rods also increases the cost and waste. Finally, the existing spiral anchor foundation mostly adopts the mode of steel pile cap, and the spiral anchor rod is screwed into the soil layer according to the design requirements on site, and then a steel pile cap is welded on the top of the anchor rod. This operation process puts very high requirements on the technical level of the construction unit, but it is also very difficult to fully meet the design requirements, and the welding on site is very difficult, and the quality of welding is not easy to guarantee.

[0006] The cast-in-place concrete pile cap foundation has large opening amount, heavy environmental damage, and long construction period. Moreover, the cast-in-place main column and pile cap need multiple processes, such as binding reinforcement, formwork, pouring, maintenance, etc., which increases the period. In addition, the foot bolt connection between the iron tower and the foundation also needs a cast-in-place main column and a pre-buried bolt, which leads to a long construction period.

[0007] The existing PHC pipe pile foundation often has a concrete pile cap, the single-section pile length of PHC pipe pile is limited by the height of pile driver; at the same time, the number of joints should not be too many, and the total length of pile delivery is limited. Moreover, PHC pipe pile has large soil squeezing effect, requires orderly construction, and needs to appropriately increase pile spacing.

[0008] The utility model aims to at least solve one of the technical problems in the related art to some extent.

[0009] Therefore, the embodiment of the utility model discloses a kind of assembled composite cap foundation with strong bearing capacity, wide use range, little construction difficulty.

[0010] The assembled composite cap foundation according to the embodiment of the utility model comprises: a cap; PHC foundation piles, which extend in the up-down direction and are detachably arranged below the cap to support the cap; and a screw anchor foundation, which comprises an anchor rod and a screw anchor disc, the anchor rod extends in the up-down direction, the upper end of the anchor rod is connected with the cap, and the screw anchor disc spirally surrounds the outer circumferential surface of the anchor rod in the up-down direction to support the cap.

[0011] The assembled composite cap foundation according to the embodiment of the utility model is provided with PHC foundation piles and a screw anchor foundation, the advantages of the two types of foundations are fully utilized by the combination of the screw anchor foundation and the PHC pipe pile, the overall uplift and compression bearing capacity of the foundation is greatly improved, the application range of the assembled composite cap foundation is improved, and the construction difficulty of the assembled composite cap foundation is reduced.

[0012] In some embodiments, the PHC foundation piles are multiple, the multiple PHC foundation piles are arranged in multiple rows in the length direction of the cap, and each row comprises a plurality of PHC foundation piles arranged in the width direction of the cap.

[0013] In some embodiments, the screw anchor foundations are multiple, the multiple screw anchor foundations are arranged in multiple rows in the length direction of the cap, and each row comprises a plurality of screw anchor foundations arranged in the width direction of the cap.

[0014] In some embodiments, at least one screw anchor foundation is arranged between two adjacent PHC foundation piles.

[0015] In some embodiments, a first flange plate is arranged at the upper end of the PHC foundation pile, the first flange plate and the cap are connected by a fastener, and / or a second flange plate is arranged at the upper end of the anchor rod, and the second flange plate and the cap are connected by the fastener.

[0016] In some embodiments, the assembled composite cap foundation further comprises multiple anchor bolts, and the multiple anchor bolts are arranged on the cap and adapted to be connected with a tower foot plate.

[0017] In some embodiments, the cap comprises multiple cap units which are sequentially and detachably connected, the multiple cap units are sequentially arranged in multiple rows in the length direction of the cap, each row comprises a plurality of cap units arranged in the width direction of the cap, and one of the PHC foundation piles and the screw anchor foundation is arranged below the cap units and connected with the cap units.

[0018] In some embodiments, the deck is provided with a filling hole penetrating the deck in the up-down direction, the filling hole being formed between adjacent four deck units, and the filling hole being used for filling surplus soil.

[0019] In some embodiments, the fabricated composite deck foundation further comprises a connecting plate arranged between adjacent two deck units and connected to the adjacent two deck units at both ends of the connecting plate by fasteners.

[0020] In some embodiments, the cross-sectional area of the lower end of the anchor rod of the screw anchor foundation gradually decreases from top to bottom. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the front view of the fabricated composite deck foundation of the embodiment of the utility model.

[0022] Figure 2 is the top view of the fabricated composite deck foundation of the embodiment of the utility model.

[0023] Figure 3 is the structural schematic view of the screw anchor foundation of the fabricated composite deck foundation of the embodiment of the utility model.

[0024] Figure 4 is the structural schematic view of the PHC foundation pile of the fabricated composite deck foundation of the embodiment of the utility model.

[0025] The fabricated composite deck foundation 100;

[0026] The deck 1; the anchor bolt 11; the deck unit 12; the first plate 121; the second plate 122; the third plate 123; the filling hole 13;

[0027] The PHC foundation pile 2; the first flange plate 21;

[0028] The screw anchor foundation 3; the anchor rod 31; the screw anchor plate 32; the second flange plate 33;

[0029] The connecting plate 4; the tower foot plate 5. DETAILED DESCRIPTION

[0030] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as the limitation of the utility model.

[0031] The fabricated composite deck foundation 100 according to the embodiment of the utility model is described below with reference to the drawings.

[0032] As Figures 1-4As shown, the fabricated composite pile cap foundation 100 according to the embodiment of the present application comprises a pile cap 1, a PHC pile 2 and a spiral anchor foundation 3.

[0033] The PHC pile 2 extends along the up-down direction and is detachably arranged below the pile cap 1 so as to support the pile cap 1. Specifically, as shown in Figure 1 and Figure 4 The pile cap 1 is prefabricated in a factory and mainly functions as a support platform for the upper structure, and the PHC pile 2 is a pipe pile extending vertically along the up-down direction, the upper end of the PHC pile 2 is connected to the pile cap 1 through fasteners, and the PHC pile 2 can be hammered into the foundation (geological sections such as cohesive soil, sandy soil and silt soft soil) through a hammering method, so that the fabricated composite pile cap foundation 100 is installed at a preset position, thereby being applicable to various geological sections such as cohesive soil, sandy soil and silt soft soil in a power transmission line, and having a wide range of applications and being applicable to the foundation construction of the power transmission line with high requirements for water and environment protection and high construction period.

[0034] The spiral anchor foundation 3 comprises an anchor rod 31 and a spiral anchor disc 32, the anchor rod 31 extends along the up-down direction and the upper end of the anchor rod 31 is connected to the pile cap 1, and the spiral anchor disc 32 spirally surrounds the outer periphery of the anchor rod 31 along the up-down direction so as to support the pile cap 1. Specifically, as shown in Figure 1 and Figure 3 The anchor rod 31 is a vertical anchor rod 31 extending along the up-down direction and the upper end of the anchor rod 31 is detachably connected to the pile cap 1 through fasteners, the spiral anchor disc 32 is spirally welded on the outer periphery of the anchor rod 31, and the spiral anchor foundation 3 is drilled into the soil through a special construction machine to increase the friction between the anchor rod 31 and the surrounding soil, thereby improving the stability of the entire foundation.

[0035] The fabricated composite pile cap foundation 100 according to the embodiment of the present application is provided with the PHC pile 2 and the spiral anchor foundation 3, the spiral anchor foundation 3 improves the uplift, compression and overturning resistance of the fabricated composite pile cap foundation 100, the spiral anchor foundation 3 improves the bearing capacity of the fabricated composite pile cap foundation 100, improves the construction efficiency, reduces the installation cost and construction difficulty of the fabricated composite pile cap foundation 100, the spiral anchor foundation 3 and the PHC pipe pile 2 are combined, the advantages of the two types of foundations are fully utilized, the uplift and compression resistance of the entire foundation are greatly improved, the application range of the fabricated composite pile cap foundation 100 is improved, and the construction difficulty of the fabricated composite pile cap foundation 100 is reduced.

[0036] In some embodiments, the pile cap 1 comprises a plurality of pile cap units 12 which are sequentially and detachably connected, the pile cap units 12 extend along the length direction of the pile cap 1 (as shown in Figure 2The plurality of pile units 12 are arranged in three rows along the front-rear direction, and each row includes a plurality of pile units 12 arranged in sequence along the left-right direction. Two adjacent pile units 12 can be detachably connected by fasteners. The plurality of pile units 12 can be prefabricated in a factory in advance and assembled on site, thereby reducing the transportation cost of the pile 1, greatly shortening the construction period, and reducing the construction cost. In addition, the plurality of pile units 12 can be flexibly combined to form a larger pile 1, adapt to different engineering requirements, and provide great convenience for subsequent maintenance and replacement. The PHC pile 2 and the screw anchor foundation 3 can be selectively installed under the pile unit 12 according to actual needs. For example, when a higher bearing capacity is required, the number of screw anchor foundations 3 installed under the pile unit 12 is less than the number of PHC piles 2, or when the uplift performance needs to be improved and the pile 1 needs to be prevented from deforming or displacing, the number of screw anchor foundations 3 installed under the pile unit 12 is greater than the number of PHC piles 2. Figure 2 Figure 1 Figure 2 The plurality of pile units 12 are arranged in three rows along the front-rear direction, and each row includes a plurality of pile units 12 arranged in sequence along the left-right direction. Two adjacent pile units 12 can be detachably connected by fasteners. The plurality of pile units 12 can be prefabricated in a factory in advance and assembled on site, thereby reducing the transportation cost of the pile 1, greatly shortening the construction period, and reducing the construction cost. In addition, the plurality of pile units 12 can be flexibly combined to form a larger pile 1, adapt to different engineering requirements, and provide great convenience for subsequent maintenance and replacement. The PHC pile 2 and the screw anchor foundation 3 can be selectively installed under the pile unit 12 according to actual needs. For example, when a higher bearing capacity is required, the number of screw anchor foundations 3 installed under the pile unit 12 is less than the number of PHC piles 2, or when the uplift performance needs to be improved and the pile 1 needs to be prevented from deforming or displacing, the number of screw anchor foundations 3 installed under the pile unit 12 is greater than the number of PHC piles 2.

[0037] In some embodiments, the pile 1 is provided with a plurality of filling holes 13 penetrating the pile 1 along the up-down direction. The filling holes 13 are formed between adjacent four pile units 12. The filling holes 13 are used to fill the remaining soil. Specifically, as shown in Figure 2 The plurality of pile units 12 are arranged in three rows along the front-rear direction, and each row includes a plurality of pile units 12 arranged in sequence along the left-right direction. Two adjacent pile units 12 can be detachably connected by fasteners. The plurality of pile units 12 can be prefabricated in a factory in advance and assembled on site, thereby reducing the transportation cost of the pile 1, greatly shortening the construction period, and reducing the construction cost. In addition, the plurality of pile units 12 can be flexibly combined to form a larger pile 1, adapt to different engineering requirements, and provide great convenience for subsequent maintenance and replacement. The PHC pile 2 and the screw anchor foundation 3 can be selectively installed under the pile unit 12 according to actual needs. For example, when a higher bearing capacity is required, the number of screw anchor foundations 3 installed under the pile unit 12 is less than the number of PHC piles 2, or when the uplift performance needs to be improved and the pile 1 needs to be prevented from deforming or displacing, the number of screw anchor foundations 3 installed under the pile unit 12 is greater than the number of PHC piles 2.

[0038] In some embodiments, the pile unit 12 includes a first plate 121, a second plate 122, and a third plate 123. The first plate 121 and the second plate 122 are horizontal plates and are arranged in sequence along the up-down direction. The third plate 123 is a vertical plate and is arranged between the first plate 121 and the second plate 122. The upper end and the lower end of the third plate 123 are connected to the first plate 121 and the second plate 122, respectively. Specifically, as shown in Figure 2 ​​As shown, the first plate 121 and the second plate 122 are horizontal steel plates and are arranged in a spaced manner along the up-down direction, and the third plate 123 is a vertical steel plate, and the upper and lower ends of the third plate 123 are connected with the first plate 121 and the second plate 122 respectively, so that the pile cap unit 12 forms an H-shaped steel, and the H-shaped steel structure has high bending and shear strength, so that the pile cap unit 12 can effectively bear and disperse the load transmitted from the upper structure, and the overall stability of the pile cap unit 12 is enhanced, and deformation or displacement of the pile cap unit 12 in the stress process is prevented.

[0039] In some embodiments, the fabricated composite pile cap foundation 100 further comprises a connecting plate 4 arranged between two adjacent pile cap units 12, and the two ends of the connecting plate 4 are connected with the two adjacent pile cap units 12 by fasteners. Specifically, as shown in Figure 2 As shown, the connecting plate 4 is a horizontal plate, and a plurality of first through holes extending along the up-down direction are arranged on the connecting plate 4, and the second through holes of at least one of the first plate 121 and the second plate 122 penetrate the pile cap unit 12 along the up-down direction, the connecting plate 4 can be arranged below the two adjacent first plates 121, and the first through holes and the second through holes are arranged oppositely, or the connecting plate 4 can be arranged above the two adjacent second plates 122, and the first through holes and the second through holes are arranged oppositely, and the fasteners are arranged in the first through holes and the second through holes respectively to connect the two adjacent pile cap units 12, so that the bolts are connected, the welding work on site is avoided, the construction speed on site is greatly improved, and various difficulties caused by the welding work on site are avoided.

[0040] In some embodiments, the plurality of PHC foundation piles 2 are arranged in a plurality of rows along the length direction of the pile cap 1, and each row includes a plurality of PHC foundation piles 2 arranged in a spaced manner along the width direction of the pile cap 1. Specifically, as shown in Figure 1 and Figure 2 As shown, the plurality of PHC foundation piles 2 are arranged in a plurality of rows along the left-right direction, and each row includes a plurality of PHC foundation piles 2 arranged in a spaced manner along the front-back direction, the upper ends of the PHC foundation piles 2 are connected with the pile cap 1, and the lower ends of the PHC foundation piles 2 can be driven into the foundation, so that the overall stability and bearing capacity are improved by the plurality of PHC foundation piles 2, and the actual geological conditions can be adjusted to adapt to different engineering requirements.

[0041] In some embodiments, the plurality of spiral anchor foundations 3 are arranged in a plurality of rows along the length direction of the pile cap 1, and each row includes a plurality of spiral anchor foundations 3 arranged in a spaced manner along the width direction of the pile cap 1. Specifically, as shown in Figure 2As shown, the spiral anchor foundations 3 are arranged in multiple rows in the left-right direction, each row including a plurality of spiral anchor foundations 3 arranged in the front-back direction, and the upper ends of the spiral anchor foundations 3 are connected to the bearing platform 1, and the lower ends of the spiral anchor foundations 3 can be drilled into the foundation, thereby ensuring that the bearing platform 1 has uniform support in all directions through the multiple spiral anchor foundations 3, and improving the overall stability and load-bearing capacity.

[0042] In some embodiments, at least one spiral anchor foundation 3 is arranged between two adjacent PHC foundation piles 2. Specifically, as shown in Figure 1 and Figure 2 As shown, the multiple PHC foundation piles 2 and the multiple spiral anchor foundations 3 are staggered below the bearing platform 1, making the support points below the bearing platform 1 more uniform, improving the stability and uplift resistance of the overall structure, and making the assembly type composite bearing platform foundation 100 more reasonable.

[0043] It is worth noting that: in the schematic diagram, 5 PHC pipe piles and 4 spiral anchor foundations 3 are arranged, the 5 PHC pipe piles are located at the four corners and the center position, and the spiral anchor foundations 3 are located in the middle of the longitudinally and transversely adjacent PHC pipe piles. The actual number of PHC pipe piles and spiral anchor foundations 3 can be adjusted according to the upper load and geological conditions, and the size of the steel bearing platform 1 is also adjusted accordingly. The arrangement pattern of the foundation piles and the bearing platform 1 can be square, rectangular, triangular, trapezoidal, etc., and the actual stress and design optimization measures are used for arrangement. The different components of the steel bearing platform 1 and the connection between the steel bearing platform 1 and the lower foundation piles (PHC and spiral anchor) are connected through bolts, and all welding work is concentrated in the factory, which can greatly improve the construction speed on site, and avoid various difficulties caused by welding work on site (power supply, welding quality, welding process requirements, etc.).

[0044] In some embodiments, as shown in Figures 1-4 The upper end of the PHC foundation pile 2 is provided with a first flange plate 21, the first flange plate 21 and the bearing platform 1 are connected through fasteners, and / or the upper end of the anchor rod 31 is provided with a second flange plate 33, the second flange plate 33 and the bearing platform 1 are connected through fasteners. In this way, the upper end of the PHC foundation pile 2 is welded with the first flange plate 21, and the PHC foundation pile 2 is connected to the bearing platform 1 through the first flange plate 21, the upper end of the anchor rod 31 is welded with the second flange plate 33, and the anchor rod 31 is connected to the bearing platform 1 through the second flange plate 33, thereby simplifying the on-site installation process through the connection mode of the first flange plate 21 and the second flange plate 33, and reducing the construction difficulty. At the same time, it is also convenient for later maintenance and replacement, and only needs to loosen the fasteners to adjust or replace, thereby improving the maintenance and replacement efficiency.

[0045] In some embodiments, the assembly type composite bearing platform foundation 100 further includes a plurality of anchor bolts 11 arranged on the bearing platform 1 and adapted to be connected to the tower foot plate 5. Specifically, as shown inFigure 1 As shown in the drawings, the plurality of foundation bolts 11 are arranged in the middle of the bearing platform 1 and are arranged at intervals along the circumference of the bearing platform 1, the foundation bolts 11 penetrate the bearing platform 1 and the upper part of the foundation bolts 11 protrudes from the bearing platform 1, so that the foundation bolts 11 are connected with the tower foot plate 5. Thus, the foundation bolts 11 are detachably connected with the tower foot plate 5, compared with the related art, the foundation bolts 11 do not need to be pre-buried in the concrete main column, thereby reducing the engineering cost.

[0046] In some embodiments, the cross-sectional area of the lower end of the anchor rod 31 gradually decreases from top to bottom. Specifically, as shown in the drawings, the lower end of the anchor rod 31 is conical, so that the anchor rod 31 can be conveniently drilled into the foundation. Figure 1 Figure 3 As shown in the drawings, the lower end of the anchor rod 31 is conical, so that the anchor rod 31 can be conveniently drilled into the foundation.

[0047] The assembled composite bearing platform foundation 100 of the embodiment of the utility model can be used in various types of cohesive soil, silt, sandy soil, silt soft soil and other geological sections in the power transmission line. The bearing platform 1 part of the foundation is composed of an assembled steel structure component, the PHC pipe pile is a standard component prefabricated in the factory, and the spiral anchor foundation 3 is a component pre-processed in the project. The components are spliced by welding and bolt connection. The new type of foundation type not only has the advantage of high bearing capacity of the conventional group pile foundation, but also effectively plays the advantages of the spiral anchor foundation 3 and the PHC pipe pile. The prefabricated components such as the prefabricated bearing platform 1 of the steel structure, the PHC pipe pile and the spiral anchor greatly reduce the construction period on site (avoiding the concrete mixing, pouring, maintenance, steel binding and formwork of the conventional bearing platform 1, main column and foundation pile). The size of the steel bearing platform 1 effectively reduces the earthwork excavation of the soil body, and the gap between the steel can be backfilled to absorb part of the excess soil. The foundation main column of the conventional group pile foundation is cancelled to save the amount of foundation concrete. In this way, the bearing capacity of the foundation can be significantly improved, the construction period can be significantly reduced, the engineering investment cost can be significantly reduced, the quality is stable and reliable and easy to control, and it is also conducive to water and soil conservation and environmental protection.

[0048] The assembled composite bearing platform foundation 100 of the embodiment of the utility model can be used in certain projects passing through ecological environment sensitive points or protection zones and the like, and has strict requirements on water and soil loss prevention and treatment and construction period, and the geological conditions can meet the use of the group pile foundation. The environmental protection and significant shortening of construction period of the foundation type of the utility model can be fully utilized.

[0049] In summary, the assembled composite foundation of the utility model can be used in various types of cohesive soil, silt, sandy soil, silt soft soil and other geological sections in the power transmission line, and has a wide range of uses. It can also be used in the foundation construction of the power transmission line with high requirements on water and soil conservation and high construction period.

[0050] The assembled composite bearing platform foundation 100 of the embodiment of the utility model has the following advantages:​

[0051] (1) The combination of the screw anchor foundation 3 and the PHC pipe pile gives full play to the advantages of the two types of foundations. Firstly, it effectively improves the horizontal bearing capacity and bending stiffness of the traditional screw anchor foundation 3. Secondly, compared with a single foundation, it significantly improves the overall uplift and compression bearing capacity of the foundation. Thirdly, it effectively avoids the design and construction difficulties caused by the long PHC pile, long screw anchor pile, and large screw anchor disc 32, such as large displacement and deformation. Fourthly, the scheme of setting PHC pipe piles on the outside and screw anchor foundations 3 on the inside can effectively solve the adverse effects caused by the obvious soil squeezing effect of adjacent piles of multi-pile PHC pipe piles. Fifthly, the combined foundation can reduce the number of PHC foundation piles 2, the number of screw anchor rods 31, and the size of the screw anchor disc 32, thereby optimizing the amount of foundation material or allowing it to withstand greater external loads. Sixthly, the combined foundation can increase the overall reliability of the foundation to compensate for the uncertainty in the theoretical and practical research of the screw anchor foundation 3 in extreme conditions, failure modes, bearing performance, and other aspects. Seventhly, it solves the problem of on-site welding of the screw anchor pile cap 1 and the anchor rod 31.

[0052] (2) The entire foundation is made of prefabricated components, all of which can be processed in advance in the factory. Only a small amount of bolt connection and assembly work needs to be done at the construction site, greatly reducing the on-site construction period (avoiding the steel reinforcement binding, formwork, concrete mixing, pouring, and curing periods of conventional pile caps 1, main columns, and foundation piles).

[0053] (3) The foundation pile is a prefabricated pipe pile (PHC pipe pile), and the screw anchor is also prefabricated in the factory, greatly reducing the on-site construction period (avoiding the steel reinforcement binding, formwork, concrete mixing, pouring, and curing periods of conventional cast-in-place foundation piles). At the same time, the prefabricated pipe pile has the advantages of high single-pile bearing capacity, good bending performance, stable and reliable quality, and economical cost.

[0054] (4) The tower foot plate 5 of this foundation type is directly connected to the steel pile cap 1 through the foundation bolt 11, eliminating the need for the foundation main column of the conventional group pile foundation to connect the tower foot plate 5 of the iron tower. This not only saves the amount of foundation concrete but also, like part of the pile cap 1, reduces the construction period.

[0055] (5) The size of the steel pile cap 1 is significantly reduced compared to concrete, effectively reducing soil excavation, and the gap between the steel can be backfilled to accommodate part of the excess soil.

[0056] (6) Factory prefabrication can greatly avoid errors, quality problems, and safety risks caused by on-site construction.

[0057] Therefore, the base type can significantly improve the bearing capacity of the base, significantly shorten the construction period, significantly reduce the engineering investment cost, and be stable and reliable in quality and easy to control, and is beneficial to water and soil conservation and environmental protection.

[0058] In the description of the utility model, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0059] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0060] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0061] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0062] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

Claims

1. A fabricated composite pile cap foundation, characterized by, The utility model relates to a foundation for a high-voltage transmission tower, comprising: a bearing platform; a plurality of PHC piles extending in the vertical direction and detachably arranged below the bearing platform to support the bearing platform; a plurality of screw anchor foundations each comprising a screw anchor rod extending in the vertical direction and having an upper end connected to the bearing platform, and a screw anchor disc spirally wound around the outer surface of the screw anchor rod in the vertical direction to support the bearing platform.

2. The fabricated composite mat foundation according to claim 1, wherein, The plurality of PHC piles are arranged in multiple rows along the length direction of the bearing platform, and each row comprises a plurality of PHC piles arranged in the width direction of the bearing platform.

3. The fabricated composite mat foundation according to claim 2, wherein, The plurality of screw anchor foundations are arranged in multiple rows along the length direction of the bearing platform, and each row comprises a plurality of screw anchor foundations arranged in the width direction of the bearing platform.

4. The fabricated composite mat foundation according to claim 3, wherein, At least one screw anchor foundation is arranged between any two adjacent PHC piles.

5. The fabricated composite mat foundation according to claim 1, wherein, The upper end of each PHC pile is provided with a first flange plate, and the first flange plate and the bearing platform are connected by a fastener. The upper end of each screw anchor foundation is provided with a second flange plate, and the second flange plate and the bearing platform are connected by the fastener.

6. The fabricated composite mat foundation according to claim 1, wherein, The utility model further comprises a plurality of anchor bolts arranged on the bearing platform and adapted to be connected to the tower foot plates of an upper tower.

7. The fabricated composite mat foundation according to claim 1, wherein, The bearing platform comprises a plurality of bearing units sequentially and detachably connected, and the plurality of bearing units are arranged in multiple rows along the length direction of the bearing platform, and each row comprises a plurality of bearing units arranged in the width direction of the bearing platform.

8. The fabricated composite mat foundation according to claim 7, wherein, One of the PHC piles and the screw anchor foundations is arranged below each bearing unit and connected to the bearing unit.

9. The fabricated composite mat foundation according to claim 7, wherein, The bearing platform is provided with a filling hole penetrating the bearing platform in the vertical direction, and the filling hole is formed between any four adjacent bearing units and used for filling residual soil.

10. The fabricated composite mat foundation according to claim 1, wherein, The utility model further comprises a connecting plate arranged between any two adjacent bearing units and connected to the two ends of the connecting plate and the two adjacent bearing units by fasteners. The cross-sectional area of the lower end of the screw anchor rod of each screw anchor foundation gradually decreases from top to bottom.

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