CN112281902A - Multisection expands dish assembled hollow excavation class basis - Google Patents

Abstract

The invention discloses a multi-section expanded disc assembly type hollow digging foundation which comprises a concrete assembly and prestressed steel bars, wherein the concrete assembly is arranged on the concrete assembly; the concrete assembly is provided with a plurality of through preformed holes along the height direction; the plurality of concrete assemblies are sequentially stacked in the foundation pit, and the prestressed reinforcement penetrates through corresponding preformed holes in the plurality of concrete assemblies to enable the concrete assemblies to be assembled to form a foundation main body; the concrete assembly is a non-cylindrical expansion disc component, and the middle part of the concrete assembly is of a hollow structure; and cement paste or fine aggregate concrete is filled in a gap between the concrete assembly and the foundation pit. The multi-section expanding disc assembly type hollow excavation foundation provided by the invention can fully play the synergistic effect of the foundation and a soil body, improve the vertical and horizontal bearing capacity and the lateral rigidity of the foundation, save the construction time and the construction period, reduce the construction safety risk and the construction cost, reduce the construction waste and the environmental damage, improve the concrete quality and the foundation durability, and is beneficial to environmental protection.

Description

Multisection expands dish assembled hollow excavation class basis

Technical Field

The invention relates to the technical field of power transmission line iron tower foundations, in particular to a multi-section expanded disc assembly type hollow excavation foundation.

Background

More and more power transmission lines pass through mountain areas such as high mountains and high mountains, and face the difficulties of complex service environments such as saline soil and frozen soil and lack of building materials. The prefabricated assembly type foundation is applied to engineering practice gradually in the advantages of rapid construction, easy quality control, good durability and concentrated transportation of building materials, and the excavated foundation is high in bearing capacity and less in earthwork operation due to the characteristic of original soil, so that large-area damage to terrain and environment caused by excavation of foundation types such as plate type foundations and pile group foundations is avoided, and the prefabricated assembly type foundation is widely applied to power transmission lines in mountainous areas and tower positions with high requirements on environmental protection. The assembled foundation and the digging type foundation are combined together to form the assembled digging type foundation which has the advantages of wide application range, short construction period, good durability, high bearing capacity, easy quality control, less terrain damage and environmental protection.

Meanwhile, with the enlargement of the scale of the power grid, the safe operation of the power grid is increasingly threatened by extreme severe weather and sudden disasters, and the power grid is easily damaged. In the foundation rush-repair process, the assembly type digging foundation can save the concrete pouring and maintaining time with larger volume, and accelerate the rush-repair speed of the transmission line tower foundation, especially the rush-repair speed under the complex mountain terrain.

On the other hand, at present, the research on the assembly type digging type foundation is less, the assembly type foundation is mainly a plate column type foundation or a step type foundation, the existing undisturbed soil assembly foundation type is mainly a steel pipe pile or a concrete pipe pile, but due to the limitation of field conditions, the anchoring force between the pipe pile and the foundation soil is difficult to control due to the pipe sinking process adopted in the power transmission line, the reliability of the uplift bearing capacity is poor, and the practical application is less. The main type of the emergency repair foundation is a steel reinforced concrete digging type foundation, besides a steel bar truss is used for replacing steel bars, a large amount of concrete still needs to be poured on site, the limitation of the concrete curing age on the emergency repair construction period is not obviously changed, and the following problems exist in the application: 1) concrete curing can restrict rush repair or construction period. 2) In areas where building materials are scarce, cement, gravel and water transportation are problematic. 3) In, the tower position of strong corruption need adopt and carry out anticorrosive design, and the concrete that adopts high grade number must use compulsory mixer to mix, adopts outer protection such as anticorrosive paint to need multichannel process operation, can make the difficult degree of salvage construction and construction cycle greatly increased. 4) When rush-repair is carried out in winter, the concrete needs to adopt winter construction measures, and if the concrete meets rain and snow weather, the operation difficulty and the workload can be greatly improved.

In order to solve the problems, the bearing performance and the construction speed of the assembled excavation type foundation and the emergency repair excavation type foundation are improved, and the applicability of the assembled excavation type foundation and the construction speed under various environments is high, and the multi-section expansion disc assembled hollow excavation type foundation is needed.

Disclosure of Invention

Aiming at the defect of poor reliability of the uplift bearing capacity of the foundation in the prior art, the invention aims to provide a multi-section expansion disc assembly type hollow excavation foundation which has the advantages of being rapid in construction, high in foundation reliability, strong in applicability, environment-friendly and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a multi-section expanded-disc assembled hollow digging type foundation comprises a concrete assembly and prestressed steel bars; the concrete assembly is a non-cylindrical expansion disc component, the middle part of the concrete assembly is of a hollow structure, and the concrete assembly is provided with a plurality of through preformed holes along the height direction;

the plurality of concrete assemblies are sequentially stacked in the foundation pit, and the prestressed reinforcement penetrates through corresponding preformed holes in the plurality of concrete assemblies to enable the concrete assemblies to be assembled to form a foundation main body;

and cement mortar or fine aggregate concrete is filled in a gap between the concrete assembly and the foundation pit.

Optionally, the top concrete assembly is embedded with anchor bolts.

Optionally, the concrete assembly is prefabricated and molded by adopting lightweight aggregate concrete, fiber concrete or self-compacting concrete, and the surface of the concrete assembly is coated with an anticorrosive paint.

Optionally, the hollow structure is a cylinder or a circular truncated cone.

Optionally, the concrete assembly is a right circular truncated cone or an inverted circular truncated cone.

Optionally, the concrete assembly height should not be less than its average diameter.

Optionally, the concrete assembly strength is not lower than C30.

Optionally, the hollow structure is filled with residual soil for excavation of foundation pit construction.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts the mode of stacking a plurality of sections of concrete assemblies to replace the traditional on-site pouring foundation, eliminates the procedures of binding and placing a reinforcement cage on site, pouring and maintaining concrete, and only needs to pour a small amount of mortar or fine aggregate concrete between the foundation and the foundation soil, thereby shortening the construction period. And the large excavation operation of the mountain is avoided, so that the construction on the engineering site is facilitated, and the effects of saving resources and protecting the environment are achieved. Meanwhile, the load transmitted by the upper tower can be distributed by the expansion discs, so that the force transmission distribution is more uniform, the soil body with a larger range is moved to bear force together, and the safety and reliability of foundation bearing are improved. The multi-section sectional type assembling component has small volume and weight of a single component, and can avoid the adoption of large-scale transport vehicles and construction machines and reduce the construction difficulty and the construction cost in the areas with poor traffic and site conditions. The traditional excavation type foundation is large in bottom expanding construction difficulty and high in construction cost, is a main source for construction safety risk and cost increase, concrete pouring quality of a bottom expanding section is difficult to control, the prefabricated hollow excavation foundation adopts a foundation pit with equal diameter, bottom expanding of a foundation column section is cancelled, and construction difficulty, safety risk and engineering cost are reduced. After cement paste or fine aggregate concrete is filled in the gap between the concrete assembly and the foundation pit, the non-cylindrical expansion disc member has firm action with the foundation pit, and the pulling resistance bearing capacity of the foundation is improved. The multi-section expanding disc assembly type hollow excavation foundation provided by the invention can fully play the synergistic effect of the foundation and a soil body, improve the vertical and horizontal bearing capacity and the lateral rigidity of the foundation, save the construction time and the construction period, reduce the construction safety risk and the construction cost, reduce the construction waste and the environmental damage, improve the concrete quality and the foundation durability, and is beneficial to environmental protection.

Furthermore, the bearing capacity of the foundation can be increased by the multi-section disc expanding component of the right circular truncated cone or the inverted circular truncated cone, the bearing capacity of the foundation is improved, the size and the burial depth of the foundation can be reduced, and the manufacturing cost is saved.

Furthermore, the residual soil for construction of the excavated foundation can be arranged in the hollow part of the foundation, so that the treatment capacity of the residual soil on site is reduced, the environment is protected, and the external transportation and treatment cost of earthwork is saved.

Furthermore, the concrete assembly is prefabricated by a factory, new materials and new technologies such as light aggregate concrete, fiber concrete, self-compacting concrete and the like can be adopted, the problem of concrete quality caused by severe field construction conditions is solved, concrete with high durability can be adopted for manufacturing in geological applications such as saline soil, frozen soil and the like or anticorrosive paint is coated on the surface of a concrete product, and the concrete assembly is beneficial to meeting the durability requirement and facilitating the popularization of new materials and new technologies.

Drawings

FIG. 1 is a schematic structural view of a prefabricated hollow digging foundation of a circular truncated cone;

FIG. 2 is a schematic view of a structure of an inverted circular truncated cone prefabricated hollow digging foundation;

FIG. 3 is a schematic view of a right circular table assembly;

FIG. 4 is a schematic view of an inverted frustum assembly;

wherein: 1-concrete composite member, 2-prestressed reinforcement, 3-embedded foundation bolt and 4-preformed hole.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in figures 1 and 2, the multi-section expanding disc assembly type hollow excavation foundation comprises a concrete assembly 1 and prestressed reinforcement bars 2. The concrete composite member 1 and the prestressed reinforcement 2 form a foundation whole. The concrete assemblies 1 are connected in a combined mode through the prestressed reinforcements 2.

A preformed hole 4 of a prestressed reinforcement 2 is symmetrically reserved on the concrete composite member 1; the foundation bolts 3 are embedded in the top concrete assembly 1. The composite concrete can be made of light aggregate concrete, fiber concrete, self-compacting concrete and other new materials.

The top concrete assembly 1 needs to be embedded with foundation bolts 3; the centers of gravity of the concrete assemblies 1 are on the same plumb line, and the reserved holes are communicated up and down. And after the foundation is assembled, filling the gaps between the foundation and the soil on the periphery by adopting mortar. The concrete assembly 1 needs to be provided with longitudinal stress bars, circumferential stress bars and horizontal stress bars.

As shown in fig. 3 and 4, the concrete assembly 1 is hollow, the middle of the concrete assembly 1 is a hollow part, and the middle hollow part can be in a cylindrical or truncated cone shape. The concrete assembly 1 can adopt a right circular truncated cone or an inverted circular truncated cone, and the upper area and the lower area are different, so that after cement is poured, the cement can be solidified into a whole with the foundation main body.

Further, the maximum diameter of the concrete assembly 1 should not be less than 0.8 m; the height of the concrete assembly 1 should not be less than its average diameter. The concrete assembly 1 can adopt a disc expanding component of a right circular table or an inverted circular table.

Furthermore, the combined concrete can adopt new materials such as lightweight aggregate concrete, fiber concrete, self-compacting concrete and the like or can paint anticorrosive paint on the surface of a concrete product.

Furthermore, the mortar can be common mortar or self-compacting mortar, and the strength of the mortar is not lower than M10; or fine stone concrete with the strength not lower than C30.

The construction process of the prefabricated hollow digging foundation is as follows:

as shown in fig. 1 and 2, the prefabrication of the concrete assembly 1 and the root key is first completed in the factory or on site; measuring and positioning according to a construction drawing, and excavating a foundation pit in undisturbed soil to a preset depth by adopting manpower or machinery; carrying out final hole inspection and cleaning holes; positioning and arranging the bottom assembly; the hole punching of the prestressed reinforcement 2 is carried out, so that the other end is ensured to be reliably installed; assembling the assemblies in sections according to requirements, and sequentially penetrating through the prestressed reinforcement 2 until the assembly at the top end is installed; applying a prestress; grouting the periphery of the foundation and the gap of the prestressed reinforcement 2 to enable the foundation and the prestressed reinforcement to be tightly combined, and maintaining mortar or fine aggregate concrete to the designed strength; the residual construction soil is buried in the hollow part of the foundation.

After the foundation is combined, cement paste or fine aggregate concrete is injected through a grouting guide pipe or a pumping pipe to fill gaps around the foundation and reinforce the side wall of the main structure of the foundation and the foundation soil body.

The multi-section expanding disc assembly type hollow excavation foundation for the power transmission line can fully play the synergistic effect of the foundation and a soil body, improve the vertical and horizontal bearing capacity and the lateral rigidity of the foundation, save the construction time and the construction period, reduce the construction safety risk and the construction cost, reduce the construction waste and the environmental damage, improve the concrete quality and the foundation durability, and is beneficial to environmental protection.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the following claims.

Claims (8)

1. The utility model provides a multisection expands dish assembled hollow digging type basis which characterized in that: comprises a concrete composite member (1) and a prestressed reinforcement (2); the concrete composite member (1) is a non-cylindrical expansion disc member, the middle part of the concrete composite member is of a hollow structure, and the concrete composite member (1) is provided with a plurality of through preformed holes (4) along the height direction;

the concrete assemblies (1) are sequentially stacked in a foundation pit, and the prestressed reinforcement (2) penetrates through corresponding preformed holes (4) in the concrete assemblies (1) to assemble the concrete assemblies to form a foundation main body;

and cement mortar or fine aggregate concrete is filled in a gap between the concrete composite member (1) and the foundation pit.

2. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the foundation bolts (3) are embedded in the concrete assembly (1) at the top.

3. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the concrete composite member (1) is prefabricated and formed by adopting light aggregate concrete, fiber concrete or self-compacting concrete, and the surface of the concrete composite member (1) is coated with anticorrosive paint.

4. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the hollow structure is a cylinder or a round table.

5. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the concrete assembly (1) is a right circular truncated cone or an inverted circular truncated cone.

6. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the concrete assembly (1) height should not be less than its average diameter.

7. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: the strength of the concrete assembly (1) is not lower than C30.

8. The multi-section disc expanding assembly type hollow excavation foundation as claimed in claim 1, wherein: and filling and digging residual soil for foundation pit construction by the hollow structure.

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