CN212200484U - Root key type sheet pile foundation for power transmission line - Google Patents

Abstract

The utility model discloses a root key type sheet pile foundation for a power transmission line, which comprises a reinforced concrete upright post body, a casting platform and a prefabricated root key, wherein the upright post body vertically passes through the plane centroid of the casting platform, and the prefabricated root key is vertically connected to the outer side of the upright post body; the prefabricated root key type structure form enhances the synergistic effect between the soil body and the foundation, fully plays the role of bearing the soil body and improves the vertical bearing capacity and the stability; the casting platform can effectively reduce the horizontal displacement of the pile top, increase the lateral rigidity and reduce the foundation engineering quantity. The utility model provides a prefabricated root key formula sheet pile basis can effectively improve the vertical bearing capacity of basis and lateral rigidity, reduces pile foundation pile length and diameter, has cancelled the end that expands on conventional basis, has reduced basis buried depth and diameter to reduce basic construction safety risk, the construction degree of difficulty and engineering volume, reduce the unfavorable area of traffic concrete transportation engineering volume such as mountain area, play safe and reliable, practice thrift cost, environmental protection's purpose.

Description

Root key type sheet pile foundation for power transmission line

Technical Field

The utility model relates to a transmission line iron tower basis technical field especially relates to a root key formula sheet pile basis for transmission line.

Background

In recent years, along with rapid development of social economy, acceleration of industrialization and urbanization processes, contradictions between vigorous construction of high-voltage transmission line projects and shortage of construction land and difficulty in clearing channels are continuously highlighted, more and more transmission lines need to pass through steep areas such as mountains and greens, and along with increasing importance of the country on environmental protection, enhancement of ecological civilization construction and environment-friendly concept of engineering construction, construction units and design units generally select undisturbed soil foundation types such as excavation foundations and excavation piles, so that large-area earthwork construction is avoided while bearing characteristics of undisturbed soil are fully exerted, and very remarkable economic and environmental benefits are obtained.

The digging foundation and the hole digging pile foundation are very suitable for a tangent tower, a tension resistant corner tower and a high outcrop tower position foundation with large foundation acting force, and have wide application range in a power transmission line. However, as the voltage grade of the transmission line is continuously improved, the horizontal load and the vertical load of the transmission tower acting on the foundation are rapidly increased, so that the size of the foundation is continuously increased, when the diameter of the required pile foundation is larger, only a bearing platform type manual hole digging pile group foundation type can be adopted, but the construction difficulty is higher, the damage of the bearing platform excavation to the mountain body cannot be recovered, and the ecological environment is influenced; when the pile length (buried depth) of the required pile foundation is large, the possibility of foundation pit collapse is greatly increased, and the risks of high-altitude falling, object striking, electric shock, poisoning and suffocation are greatly increased. Especially in the tower position with small cohesive force such as sand and soil, when the pile length (buried depth) is large, collapse often occurs, which results in that the scheme with large pile length is poor in feasibility and safety in practical engineering. On the other hand, when the length (buried depth) of the pile reaches a certain depth, the function of the pedestal is smaller and smaller, the collapse is likely to be larger and larger, and the construction difficulty is also larger and larger.

The prefabricated root key is implanted into the digging foundation or the hole digging pile foundation to form a bionic structure, the soil body is compacted, and the excellent effect on large vertical and horizontal bearing capacity is achieved. The common control working condition of the iron tower foundation is a horizontal and vertical upwards-pulling combined working condition. For a pile foundation or a digging foundation with multiple layers of prefabricated root keys, the horizontal load resisting effect is mainly born by the first layer of prefabricated root keys and the second layer of prefabricated root keys which are closest to the ground surface, the vertical upward pulling load is born by the multiple layers of prefabricated root keys together, but under the combined action of the horizontal load and the upward pulling load, the upward pulling load can lead soil above the first layer of prefabricated root keys and the second layer of prefabricated root keys to be firstly loosened or cracked, so that the horizontal load resisting effect of the pile foundation or the digging foundation is obviously weakened, and the influence on the upper pulling load resisting effect of the pile foundation or the digging foundation is relatively small. When the horizontal load and the bending moment generated by the horizontal load are large, the foundation type of adding a plurality of layers of prefabricated root keys on a digging foundation or a hole digging pile foundation is adopted, and due to the fact that the capability of the prefabricated root keys for resisting the horizontal load is weakened under the combined load, more prefabricated root keys need to be arranged or the diameter of a pile body needs to be increased, and the like, the problems of poor economy, difficulty in construction and the like can be caused.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a root key type sheet pile foundation for a power transmission line, which has the advantages of large transverse rigidity, small side inclination and side displacement, greatly improved horizontal and vertical bearing capacity and good integral stability of the foundation; the advantages of the prefabricated root key in vertical and horizontal load resistance are fully utilized, meanwhile, the section form of the horizontal load resistance is added on the ground surface, and the problem of weakening of the horizontal load force of the multilayer prefabricated root key under the combined working condition of vertical uplift and horizontal is solved; meanwhile, the traditional base expanding of the digging foundation and the digging pile is cancelled, and the effects of lifting up, pressing down and horizontal bearing capacity can be achieved through the multilayer prefabricated root key; the method has the advantages of obviously reducing the length (buried depth) and the diameter of the pile, eliminating foundation bottom expansion, reducing construction risks, saving production cost, reducing earthwork construction and being beneficial to environmental protection.

In order to achieve the purpose, the utility model adopts the following technical proposal to realize:

a root key type sheet pile foundation for a power transmission line comprises a main concrete structure, wherein the main concrete structure comprises a vertical column body, a pouring platform and a prefabricated root key;

the top of the vertical column body is connected with an embedded part, and the casting platform is vertically intersected with the top of the vertical column body; a plurality of prefabricated root keys are connected to the stand column body bottom outside, and prefabricated root keys extend to the outside from the stand column body is inside.

Optionally, the planar shape of the casting platform is rectangular, square or cross shape formed by combining two vertically crossed concrete slabs, and the vertical column vertically passes through the planar centroid of the casting platform.

Optionally, the width of the rectangular or square casting platform is not less than 1.5 times of the diameter of the vertical column, and the width of the cast-in-place concrete lath is not less than the diameter of the vertical column.

Optionally, the prefabricated root keys are annularly, symmetrically and vertically distributed or are arranged on the outer side of the vertical column body in a vertically-staggered manner by adopting an upper layer and a lower layer.

Optionally, the minimum distance between the prefabricated root key and the pile bottom is not less than the length of the prefabricated root key, the circumferential distance of the prefabricated root key is not more than 0.5m, and the layer distance of the prefabricated root key is not less than the length of the prefabricated root key; the distance between the bottom of the pouring platform and the top of the first layer of prefabricated root keys is not less than one time of the length of the prefabricated root keys.

Optionally, the inside netted framework of steel reinforcement that has of column body, evenly distributed is provided with along the hoop on the framework of steel reinforcement and is used for inserting the root key top push hole of prefabricated root key.

Optionally, the prefabricated root key is a prefabricated reinforced concrete member, a steel reinforced concrete member or a metal member with a tip.

Optionally, the prefabricated root key is a prefabricated reinforced concrete member formed by pouring concrete on a steel reinforcement framework, and the steel reinforcement framework is a steel mesh structure formed by longitudinal main reinforcements and stirrups; the strength grade of concrete used for prefabricating the root keys is not lower than C25, and the strength of the steel bar framework is not lower than HRB 400.

Optionally, the prefabricated root key is a section steel concrete member formed by welding section steel and reinforcing steel bars and pouring concrete, and the strength grade of the concrete is not lower than C25.

Optionally, the prefabricated root key is a cross-shaped metal member formed by welding strip-shaped steel.

The utility model discloses following beneficial effect has:

the vertical column body vertically passes through the plane centroid of the pouring platform, and the prefabricated root key is vertically connected to the outer side of the vertical column body; the prefabricated root key type structure form enhances the synergistic effect between the soil body and the foundation, fully plays the role of bearing the soil body and improves the vertical bearing capacity and the stability; the casting platform can effectively reduce the horizontal displacement of the pile top, increase the lateral rigidity and reduce the foundation engineering quantity. The prefabricated root key type sheet pile foundation has the advantages of small concrete use amount, large transverse rigidity, small side inclination, side displacement and bending, good integral stability of the foundation, small waste soil amount, small influence on environment and production cost saving; and adopt prefabricated root key formula structure, utilize the soil body to prefabricated root key's bond strength and closely inlay the solid effect, increased basic level and vertical bearing capacity and stability, alleviateed the structure dead weight. The prefabricated root key type sheet pile foundation can effectively improve the vertical and horizontal bearing capacity and the lateral rigidity of the foundation, reduce the length and the diameter of a pile foundation pile, cancel the bottom expanding of a conventional foundation and reduce the buried depth and the diameter of the foundation, thereby reducing the safety risk, the construction difficulty and the engineering quantity of foundation construction, reducing the concrete transportation engineering quantity of adverse traffic areas such as mountainous areas and the like, and achieving the purposes of safety, reliability, cost saving and environment protection.

Furthermore, the prefabricated root key type sheet pile foundation can effectively resist the horizontal load of the pile top through a concrete cast-in-place plate or lath on the upper part of the pile foundation, fully exerts the bearing capacity of the pile body, reduces the horizontal displacement by about 50 percent compared with the common pile foundation, solves the problem of weakening the horizontal load force under the combined working condition of vertical upward pulling and horizontal pulling of a plurality of layers of prefabricated root keys, can reduce the diameter of the pile body and the number of the prefabricated root keys, and reduces the engineering quantity of the pile foundation.

Furthermore, under the same load condition, the prefabricated root key type sheet pile foundation can replace a multi-pile bored pile foundation with a bearing platform, so that large excavation of a mountain is avoided, engineering site construction is facilitated, and the effects of saving resources and protecting the environment are achieved.

Furthermore, the bottom expanding of the conventional power transmission line pile foundation column body is removed, the prefabricated root key is used for sharing vertical load and horizontal load, the cast-in-place plate and the lath share the horizontal load, the vertical bearing capacity and the horizontal bearing capacity are greatly increased, and the construction engineering amount, the construction risk and the construction difficulty are reduced.

Furthermore, under the same geological conditions and load action, the bearing capacity of the prefabricated root key type sheet pile foundation is greatly improved, the material efficiency ratio is high, and the economic efficiency is better. Because the pile length and the pile diameter are greatly reduced compared with the conventional foundation, the risks of collapse, high falling, object striking, electric shock, poisoning and suffocation are effectively reduced, and the feasibility, the construction safety and the convenience of the scheme are greatly improved.

Drawings

FIG. 1 is a schematic view of a foundation structure of a prefabricated root key type sheet pile;

FIG. 2 is a schematic view of a prefabricated root-key batten foundation structure;

FIG. 3 is a schematic cross-sectional view of a prefabricated root key type sheet pile foundation A-A;

FIG. 4 is a schematic cross-sectional view of a prefabricated root key slat foundation A-A;

FIG. 5 is a schematic cross-sectional view of a prefabricated root key slat foundation B-B;

FIG. 6 is an elevation view of a precast concrete root key;

FIG. 7 is a precast concrete root key reinforcement diagram;

fig. 8 is a schematic view of the prefabricated steel reinforced concrete root key provided by the present invention, (a) is a left view, and (b) is a front view;

fig. 9 is a schematic view of the prefabricated root key (metal component) of the prefabricated section steel provided by the present invention, (a) is a left side view, and (b) is a front view;

wherein: 1-upright column body, 2-casting platform, 3-prefabricated root key and 4-embedded connecting piece.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope 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 fig. 1 and 2, the utility model is used for transmission line's prefabricated root key formula sheet pile basis, including stand 1, casting platform 2, prefabricated root key 3 and pre-buried connecting piece 4.

The upright column body 1 is intersected with the casting platform 2 vertically, the plane centroid of the casting platform 2 is passed through, the embedded connecting piece 4 is connected to the top of the concrete structure, the outer side of the upright column body 1 is connected with the prefabricated root keys 3 of a plurality of vertically, and the prefabricated root keys 3 extend to a certain length from the inner side of the main concrete structure.

As shown in fig. 3-5, the plane shape of the cast-in-place plate is square or circular, the plane shape of the cast-in-place bar is cross-shaped, and the section of the vertical column body 1 is circular or square.

As shown in fig. 6-7, the prefabricated reinforced concrete root key is manufactured according to the given size, the reinforcing steel bars are arranged after the templates are supported, then the concrete is poured, and the prefabricated reinforced concrete root key is maintained to the strength required by the design. The strength of the main reinforcement used for prefabricating the root key is not lower than HRB300, and the concrete strength grade is not lower than C25.

The prefabricated root key 3 is a prefabricated reinforced concrete member, a steel reinforced concrete member or a metal member. Prefabricated root key top pushing holes should be reserved to the framework of steel reinforcement of the upright steel bar body, and the holes of reserving are evenly distributed along the hoop.

The prefabricated concrete root key is formed by forming a steel bar framework by a longitudinal main reinforcement and a stirrup and then pouring concrete, wherein the strength grade of the concrete is not lower than C25, and the strength of the main reinforcement of the prefabricated root key is not lower than HRB 300.

The prefabricated steel reinforced concrete root key is formed by connecting profile steel and steel bars to form a framework and then pouring concrete, wherein the strength grade of the concrete is not lower than C25. The prefabricated metal root key is a cross-shaped cross section and is made of section steel or other high-strength metals.

Prefabricated root key 3 ring symmetry vertical distribution or adopt upper and lower layer staggered arrangement in the stand 1 outside. The strength grade of concrete used by the main concrete structure is not lower than C25, and the strength of the main reinforcement is not lower than HRB 400.

As a preferred embodiment, the minimum distance between the prefabricated root key and the pile bottom should not be less than the length of the prefabricated root key. Prefabricated root key ring hoop evenly distributed, and prefabricated root key ring hoop interval is not more than 0.5 m. The layer spacing of the prefabricated root keys is not less than the length of the prefabricated root keys. The distance between the center of the pouring platform and the center of the prefabricated root key is not less than twice the length of the prefabricated root key. The width of the cast-in-situ plate is not less than 1.5 times of the diameter of the upright column, and the width of the cast-in-situ bar is not less than the diameter of the upright column.

The upright column body and the pouring platform are formed in a one-step pouring mode.

As shown in fig. 8, the prefabricated steel reinforced concrete root key is manufactured according to a given size, the steel section is connected with the steel bar in a welding or other mode, the steel bar is placed after the template is supported, concrete is poured, and the prefabricated steel reinforced concrete root key is maintained to the strength required by the design. The concrete strength grade is not lower than C25.

As shown in fig. 9, the cross section of the metal prefabricated root key is cross-shaped and is made of section steel or other high-strength metal.

The prefabricated root key type sheet pile foundation pouring process comprises the following steps:

as shown in fig. 1, measurement and positioning are carried out according to a construction drawing, the undisturbed soil is dug to a preset depth manually or mechanically, and the height of a reserved cast-in-place plate 2 is taken care of in the process of digging a hole; carrying out final hole inspection and cleaning holes; binding vertical column longitudinal bars and stirrups to form a reinforcement cage, and paying attention to the reserved prefabricated root key push holes; a vertical column body reinforcement cage is lowered, and the accurate lowering position of the reinforcement cage is ensured; prefabricating the prefabricated root key on site in advance, and jacking the prefabricated root key in layers; binding and lowering a pouring platform reinforcement cage which is to be reliably connected with the upright column reinforcement cage; pouring concrete until the vertical column body and the pouring platform are formed in a one-time pouring mode; and measuring and positioning the embedded connecting pieces, and finally pouring concrete of the rest parts and maintaining the foundation.

The pushing method of the prefabricated root key comprises the following steps:

the inner side of the vertical column steel reinforcement cage is provided with a prefabricated root key jacking equipment slideway; the prefabricated root key is prefabricated on site or indoors in advance, so that the use during construction is ensured;

the common prefabricated root key jacking equipment comprises: the jack is suitable for jacking the prefabricated root keys of the foundation with the pile diameter larger than 1.0m and not larger than 2.0m, the prefabricated root keys which are symmetrically arranged in an even number are utilized in the jacking process, and jacking is carried out simultaneously in the front and back directions, so that the construction time is saved; the prefabricated root key pushing equipment with the positioning support consists of three parts, namely a positioning fixing support, a jack and a conical pressing piece, and is suitable for jacking a prefabricated root key of a foundation with a pile diameter ranging from 2.0m to 3.0 m.

The prefabricated root key positioning and pushing method comprises the following steps:

(1) various preparation works are carried out before the prefabricated root key is jacked, if the length of the two opposite prefabricated root keys plus the length of the jack is greater than the diameter of the pile, holes need to be formed outwards at the positions of the prefabricated root keys;

(2) hoisting the prefabricated root key into the pile hole by using a crane or manpower, and adjusting the line shapes among the jack, the prefabricated root key and the prefabricated root key preformed hole to enable the prefabricated root key, the prefabricated root key and the prefabricated root key preformed hole to be positioned on the same axis;

(3) and opening the jack to jack in the prefabricated root key. During the jacking construction process of the prefabricated root key, attention needs to be paid to the changes of the axes of the jack, the prefabricated root key and the preformed hole, the jacking is stopped immediately after the axis deviation of the jack, the prefabricated root key and the preformed hole exceeds a certain degree, and the alignment is adjusted to continue construction.

Prefabricated root key top pushes away the assurance measure:

(1) the pushing device is positioned by adopting a positioning fixing support, so that the prefabricated root key is accurately positioned;

(2) monitoring oil pressure data during the pushing of the prefabricated root key, and immediately stopping pushing construction when the oil pressure is abnormal;

(3) when the pressure reading of the oil meter is stable and the oil quantity is not reduced any more, the prefabricated root key is pushed in place.

The utility model is used for transmission line's prefabricated root key formula sheet pile basis can effectively improve basic vertical bearing capacity and lateral rigidity, reduces pile foundation pile length and diameter, has cancelled the end that expands of conventional basis to reduce basic construction safety risk, the construction degree of difficulty and engineering volume, reduce the unfavorable area of traffic concrete transportation engineering volume such as mountain area, play safe and reliable, practice thrift cost, environmental protection's purpose.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify or equally replace the specific embodiments of the present invention, and these modifications or equivalents do not depart from the spirit and scope of the present invention, which is all within the protection scope of the claims of the present invention.

Claims (10)

1. A root key type sheet pile foundation for a power transmission line is characterized by comprising a main concrete structure, wherein the main concrete structure comprises a vertical column body (1), a pouring platform (2) and a prefabricated root key (3);

the top of the vertical column body (1) is connected with an embedded part (4), and the casting platform (2) is vertically intersected with the top of the vertical column body (1); a plurality of prefabricated root keys (3) are connected to the stand column body (1) bottom outside, and prefabricated root keys (3) extend to the outside from stand column body (1) inside.

2. The root key type sheet pile foundation for the power transmission line according to claim 1, characterized in that: the plane shape of the casting platform (2) is rectangular, square or cross-shaped formed by combining two vertically crossed concrete battens, and the vertical column body (1) vertically passes through the plane centroid of the casting platform (2).

3. The root key type sheet pile foundation for the power transmission line according to claim 2, characterized in that: the width of the rectangular or square casting platform is not less than 1.5 times of the diameter of the vertical column body (1), and the width of the cast-in-place concrete lath is not less than the diameter of the vertical column body.

4. The root key type sheet pile foundation for the power transmission line according to claim 1, characterized in that: prefabricated root key (3) hoop symmetry vertical distribution or adopt upper and lower multilayer staggered arrangement in the stand body (1) outside.

5. The root key type sheet pile foundation for the power transmission line according to claim 4, characterized in that: the minimum distance between the prefabricated root key (3) and the pile bottom is not less than the length of the prefabricated root key, the circumferential distance of the prefabricated root key is not more than 0.5m, and the layer distance of the prefabricated root key is not less than the length of the prefabricated root key; the distance between the bottom of the pouring platform and the top of the first layer of prefabricated root keys is not less than one time of the length of the prefabricated root keys.

6. The root key type sheet pile foundation for the power transmission line according to claim 1, characterized in that: the steel bar is characterized in that an annular netted steel bar framework is arranged inside the upright column body (1), and root key pushing holes used for inserting the prefabricated root keys (3) are formed in the steel bar framework in a circumferential and uniformly distributed mode.

7. The root key sheet pile foundation for the power transmission line of any one of claims 1 to 6, wherein: the prefabricated root key (3) is a prefabricated reinforced concrete member, a steel reinforced concrete member or a metal member with a tip.

8. The root key type sheet pile foundation for the power transmission line according to claim 7, characterized in that: the prefabricated root key (3) is a prefabricated reinforced concrete member formed by pouring concrete into a reinforcement cage, and the reinforcement cage is a steel mesh structure formed by longitudinal main reinforcements and stirrups; the strength grade of concrete used for prefabricating the root key (3) is not lower than C25, and the strength of the steel bar framework is not lower than HRB 400.

9. The root key type sheet pile foundation for the power transmission line according to claim 7, characterized in that: the prefabricated root key (3) is a section steel concrete member formed by welding section steel and reinforcing steel bars and pouring concrete, and the strength grade of the concrete is not lower than C25.

10. The root key type sheet pile foundation for the power transmission line according to claim 7, characterized in that: the prefabricated root key (3) is a cross-shaped metal component formed by welding strip-shaped steel.

Images