CN111485572A - Construction method of prefabricated root key type wing plate foundation - Google Patents
Construction method of prefabricated root key type wing plate foundation Download PDFInfo
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- CN111485572A CN111485572A CN202010187716.2A CN202010187716A CN111485572A CN 111485572 A CN111485572 A CN 111485572A CN 202010187716 A CN202010187716 A CN 202010187716A CN 111485572 A CN111485572 A CN 111485572A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
Abstract
The invention discloses a construction method of a prefabricated root key type wing plate foundation, which comprises a main concrete structure, wherein the main concrete structure comprises a vertical column body, a wing plate and a prefabricated root key; the top of the vertical column body is connected with an embedded part; the wing plates are uniformly arranged on the vertical column body, are vertically intersected with the vertical column body and are close to the top; a plurality of prefabricated root keys are vertically connected to the outer side of the upright column body, and the prefabricated root keys extend to the outer side from the inside of the upright column body. The prefabricated root key type wing plate foundation provided by the invention 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, and cancel the bottom expansion of a conventional foundation, thereby reducing the safety risk, the construction difficulty and the engineering quantity of foundation construction, reducing the concrete transportation engineering quantity of traffic-unfavorable areas such as mountainous areas and the like, and achieving the purposes of safety, reliability, cost saving and environment protection.
Description
Technical Field
The invention relates to the technical field of power transmission line iron tower foundations, in particular to a construction method of a prefabricated root key type wing plate foundation.
Background
With the rapid development of domestic high-voltage transmission line engineering, the transmission line needs to cross rare landforms such as mountains, gobi and the like, and with the continuous improvement of the voltage grade of the transmission line, the horizontal load and the vertical load of a transmission tower acting on a foundation are rapidly increased, so that the size of the foundation is continuously increased, the amount of required steel bars and concrete is increased, and the cost is increased.
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 which are 3-4 times of the pile diameter from the ground surface, 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 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.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a construction method of a prefabricated root key type wing plate foundation, which makes full use of the advantages of the prefabricated root key in resisting vertical and horizontal loads, and simultaneously increases a wing plate structure resisting the horizontal load on the ground surface, thereby solving the problem of weakening the horizontal load force under the combined working condition of vertical uplift and horizontal combination of a plurality of layers of prefabricated root keys; 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 invention adopts the following technical scheme:
a construction method of a prefabricated root key type wing plate foundation comprises the following steps:
firstly, measuring and positioning a foundation center, and marking the position and the outline of the concrete wing plate on the ground surface;
according to the wing plate profile marked on the ground, embedding the thin steel plates in sequence from two sides to the end part until the bottom of the thin steel plate is flush with the lower plane of the wing plate;
starting foundation pore-forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body;
determining the boundary of a wing plate according to the pre-embedded thin steel plate, and digging out the space of the wing plate;
binding the vertical column body and the wing plate steel bars to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
carrying out jacking work of the prefabricated root keys in a layered manner;
pouring concrete until the vertical column body and the wing plate are formed in a one-step pouring mode; the wing plates of the cast-in-place concrete members are uniformly arranged on the vertical column body, and the wing plates are vertically intersected with the vertical column body and are close to the top; a plurality of prefabricated root keys are vertically connected to the outer side of the upright column body, and the prefabricated root keys extend to the outer side from the inside of the upright column body.
A construction method of a prefabricated root key type wing plate foundation comprises the following steps:
the wing plates of the prefabricated steel members are welded or bolted with prefabricated screws;
measuring and positioning the center of the foundation, and marking the position and the outline of the wing plate on the ground surface;
starting foundation pore-forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body;
according to the ground surface mark, mechanically and gradually pressing the steel member wing plates until the design depth is reached;
binding the vertical column steel bars to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
jacking the prefabricated root key in layers;
a steel plate strip is put in and penetrates through the reinforcement cage of the vertical cylinder to connect the screws on the two opposite wing plates, so that the two wing plates and the reinforcement cage are integrally connected;
pouring concrete until the vertical column body and the steel wing plate form a reliable whole; the wing plates are uniformly arranged on the vertical column body and are vertically intersected with the vertical column body and close to the top; a plurality of prefabricated root keys are vertically connected to the outer side of the upright column body, and the prefabricated root keys extend to the outer side from the inside of the upright column body.
As a further improvement of the invention, a plurality of wing plates are arranged in a central symmetry way on the vertical column body, the wing plates are cast-in-place concrete members or prefabricated steel members, and the planar shapes of the wing plates are triangular, rectangular or trapezoidal.
As a further improvement of the invention, the prefabricated root keys are circularly and symmetrically distributed vertically or are arranged on the outer side of the upright post body in a staggered way by adopting an upper layer and a lower layer.
As a further improvement of the invention, 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 between the prefabricated root key and the pile bottom is not more than 0.5m, and the interlayer distance between the prefabricated root key and the pile bottom is not less than the length of the prefabricated root key; the distance between the bottom of the wing plate and the top surface of the first layer of prefabricated root keys is not less than one time of the length of the prefabricated root keys.
As a further improvement of the invention, the inside of the upright column body is provided with an annular reticular steel reinforcement framework, and root key pushing holes for inserting the prefabricated root keys are uniformly distributed on the steel reinforcement framework along the annular direction.
As a further improvement of the invention, the prefabricated root key is a prefabricated reinforced concrete member, a steel reinforced concrete member or a metal member with a sharp end.
As a further improvement of the invention, the prefabricated root key is a prefabricated reinforced concrete member formed by pouring concrete into 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.
As a further improvement of the invention, 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.
As a further improvement of the invention, the prefabricated root key is a cross-shaped metal member formed by welding strip-shaped steel sections.
The invention has the following beneficial effects:
the construction method of the invention adopts the vertical column body to vertically pass through the geometric centroid of the wing plate, and the prefabricated root key is vertically connected with 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 wing plate 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 wing plate foundation provided by the invention can effectively improve the vertical bearing capacity and the lateral rigidity of the foundation, reduce the length and the diameter of a pile foundation pile, and cancel the bottom expansion of a conventional foundation, thereby reducing the safety risk, the construction difficulty and the engineering quantity of foundation construction, reducing the concrete transportation engineering quantity of traffic-unfavorable areas such as mountainous areas and the like, and achieving the purposes of safety, reliability, cost saving and environment protection. The concrete has the advantages of small using amount of concrete, large transverse rigidity, small side inclination, side displacement and bending, good overall stability of the foundation, small waste amount, small influence on environment and production cost saving.
Furthermore, a prefabricated root key type structure is adopted, the gripping force of a soil body on the prefabricated root key and the tight embedding effect are utilized, the horizontal and vertical bearing capacity and stability of the foundation are increased, and the self weight of the structure is reduced.
Furthermore, the prefabricated root key type wing plate foundation can effectively resist horizontal load of the pile top through a concrete cast-in-place wing plate or a prefabricated steel component on the upper portion of the pile foundation, the bearing capacity of the pile body is fully exerted, horizontal displacement is reduced by about 50% compared with that of a common pile foundation, the problem of weakening horizontal load force under the combined working condition of vertical upward pulling and horizontal pulling of multiple layers of prefabricated root keys is solved, the diameter of the pile body and the number of the prefabricated root keys can be reduced, and the construction quantity of the pile foundation is reduced.
Furthermore, under the same load condition, the prefabricated root key type wing plate foundation can replace a multi-pile hole digging pile foundation with a bearing platform, so that large digging 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 wing plate is used for sharing horizontal load, the vertical bearing capacity and the horizontal bearing capacity are greatly increased, and the construction engineering quantity, 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 structural diagram of a prefabricated root key type wing plate foundation provided by the invention;
FIG. 2 is a schematic structural view of a prefabricated root key type prefabricated steel member wing plate foundation;
FIG. 3 is a schematic cross-sectional view A-A of the prefabricated root-key vane foundation of FIG. 1;
FIG. 4 is a schematic cross-sectional view A-A of the prefabricated root-key vane foundation of FIG. 2;
FIG. 5 is a schematic cross-sectional view of a prefabricated root-key airfoil foundation B-B of FIG. 1;
FIG. 6 is a schematic view of a connection mode of a prefabricated root key type prefabricated steel component wing plate foundation wing plate provided by the invention;
FIG. 7 is a schematic view of the steel member precast bolt of FIG. 6;
FIG. 8 is a schematic view of a prefabricated root key of prefabricated reinforced concrete according to the present invention;
FIG. 9 is a reinforcement diagram of the precast concrete root key;
FIG. 10 is a schematic view of a prefabricated steel reinforced concrete root key provided by the present invention; (a) is a left view, (b) is a main view;
FIG. 11 is a schematic view of a prefabricated root key (metal member) of prefabricated section steel provided by the present invention, wherein (a) is a left side view and (b) is a front view;
wherein: the method comprises the following steps of 1-vertical column body, 2-cast-in-place concrete wing plate or prefabricated steel component wing plate, 3-prefabricated root key, 4-embedded connecting piece, 5-steel component prefabricated bolt and 6-steel plate strip.
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.
The invention relates to a construction method of a prefabricated root key type wing plate foundation, which mainly aims at that a wing plate 2 is a cast-in-place concrete member and comprises the following steps:
firstly, measuring and positioning a foundation center, and marking the position and the outline of the concrete wing plate on the ground surface;
according to the wing plate profile marked on the ground, embedding the thin steel plates in sequence from two sides to the end part until the bottom of the thin steel plate is flush with the lower plane of the wing plate;
starting basic hole forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body 1;
determining the boundary of the wing plate according to the pre-embedded thin steel plate, and digging out the space of the wing plate 2;
binding a vertical column body 1 and a wing plate steel bar 2 to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
carrying out jacking work of the prefabricated root key 3 in a layered manner;
pouring concrete until the vertical column body and the wing plate are formed in a one-step pouring mode; enabling the wing plates 2 to be uniformly arranged on the vertical column body 1, wherein the wing plates 2 are vertically intersected with the vertical column body 1 and are close to the top; a plurality of prefabricated root keys 3 are vertically connected to the outer side of the upright column body 1, and the prefabricated root keys 3 extend to the outer side from the inside of the upright column body 1.
A construction method of a prefabricated root key type wing plate foundation is characterized in that a wing plate 2 is a prefabricated steel component and comprises the following steps:
prefabricating a steel component wing plate (2) in a factory or on site, wherein a prefabricated screw (5) is arranged in the steel component wing plate (2) through welding or bolt connection;
measuring and positioning the center of the foundation, and marking the position and the outline of the prefabricated steel component wing plate on the ground surface;
starting basic hole forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body 1;
according to the ground surface mark, mechanically and gradually pressing the steel member wing plates until the design depth is reached;
binding the steel bars of the vertical column body 1 to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
carrying out jacking work of the prefabricated root key 3 in a layered manner;
the screw rods 5 on the prefabricated steel component wing plates are connected with steel strips 6, and the steel strips 6 penetrate through the steel reinforcement cage of the column section and form integral connection;
pouring concrete until the vertical column body and the steel wing plate form a reliable whole; enabling the wing plates 2 to be uniformly arranged on the vertical column body 1, wherein the wing plates 2 are vertically intersected with the vertical column body 1 and are close to the top; a plurality of prefabricated root keys 3 are vertically connected to the outer side of the upright column body 1, and the prefabricated root keys 3 extend to the outer side from the inside of the upright column body 1.
As shown in fig. 1 and 5, the prefabricated root key type wing plate foundation for the power transmission line comprises a vertical column body 1, a cast-in-place concrete wing plate or a prefabricated steel component wing plate 2, a prefabricated root key 3 and an embedded connecting piece 4.
Concrete upright column body 1 and pterygoid lamina 2 are in same plumb plane, and perpendicular through pterygoid lamina 2 geometric centre of gravity, and pre-buried connecting piece 4 is connected at the concrete structure top, and the upright column body 1 outside is connected with prefabricated root key 3 of a plurality of perpendicularly, and prefabricated root key 3 extends to outside certain length from main part concrete structure is inside.
As shown in fig. 1, the cast-in-place reinforced concrete wing panel 2 has a rectangular or trapezoidal planar shape.
As shown in fig. 2, the plane shape of the prefabricated steel member wing plate 2 is triangular, trapezoidal or rectangular.
The prefabricated root key 3 is a prefabricated reinforced concrete member, a section steel concrete member or a metal member. Prefabricated root key top pushing holes are reserved in a steel reinforcement framework of the reinforced concrete upright column body, and the reserved holes are uniformly distributed along the circumferential direction.
As shown in fig. 6 and 7, the upper plane and the inner surfaces of the two side surfaces of the prefabricated steel component wing plates 2 are respectively prefabricated with a screw rod for mechanical connection, and the two side steel component wing plates are connected by bolts through steel plate strips 6 penetrating through the upright posts.
As shown in fig. 8-9, 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.
As shown in fig. 10, the prefabricated steel reinforced concrete root key is manufactured according to a given size, the steel sections are connected with the steel bars in a welding or other mode, the steel bars are placed after the templates are 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. 11, 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 metal root key is a cross-shaped cross section and is made of section steel or other high-strength metals.
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.
Further, the arrangement position of the prefabricated root key is required to avoid a steel bar joint, the size of a preformed hole of the prefabricated root key is not smaller than the design size of the prefabricated root key, and the allowable deviation of the central position of the prefabricated root key is +/-15 mm. And a reinforcing hoop is arranged near the preformed hole of the prefabricated root key.
The cast-in-place reinforced concrete wing plate and the upright post are cast-in-place integral. The prefabricated steel wing plate is connected with the vertical column body through bolts and is a cast-in-place whole body.
The prefabricated root keys are symmetrically and vertically distributed or are arranged on the outer side of the upright column body in a staggered mode by adopting an upper layer and a lower layer. The minimum distance between the prefabricated root key and the pile bottom is not 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 distance between the layers of the prefabricated root keys is not less than the length of the prefabricated root keys. The distance between the bottom of the wing plate and the top surface of the first layer of prefabricated root keys is not less than one time of the length of the prefabricated root keys. The vertical column body and the cast-in-place concrete wing plate are formed by one-time pouring.
The construction process flow of the prefabricated root key type wing plate foundation is as follows:
the construction process flow of the prefabricated root key type wing plate foundation comprises the following steps: prefabricating a prefabricated part, drilling holes, cleaning the holes, lowering a reinforcement cage, manufacturing and positioning a wing plate, lowering a prefabricated root key to a designed height, jacking the prefabricated root key, cleaning the holes again, and pouring pile body concrete.
1. A construction method of a prefabricated root key type cast-in-place concrete wing plate foundation;
measuring and positioning the center of the foundation according to a foundation construction drawing, and marking the position and the outline of the concrete wing plate on the ground surface;
according to the wing plate profile marked on the ground, the thin steel plates are manually or mechanically embedded in sequence from two sides to the end part until the bottom of the thin steel plate is flush with the lower plane of the wing plate;
adopting manual or mechanical construction to form a foundation hole, and sequentially excavating from top to bottom until the design depth of the foundation is reached;
determining the boundary of a wing plate according to the pre-embedded thin steel plate, and digging out the space of the wing plate;
carrying out final hole inspection and cleaning holes;
binding the vertical column body and the wing plate steel bars to form an integral steel bar cage, and reserving a prefabricated root key pushing hole;
a reinforcement cage is placed downwards, and the accurate placement position is ensured;
carrying out jacking work of the prefabricated root keys in a layered manner;
pouring concrete until the upright column body and the wing plate are formed in a one-step pouring mode, measuring and positioning the embedded connecting piece when the pouring is nearly finished, then pouring the rest part of concrete, and maintaining the foundation;
2. a construction method of a prefabricated root key type prefabricated steel member wing plate foundation;
prefabricating a steel component wing plate in a factory or on site;
measuring and positioning the center of the foundation according to a foundation construction drawing, and marking the position and the outline of the steel-tapping wing plate on the ground surface;
adopting manual or mechanical construction to form a hole in the foundation upright column until the design depth of the foundation is reached;
carrying out final hole inspection and cleaning holes;
according to the ground surface mark, mechanically and gradually pressing the steel member wing plates until the design depth is reached; binding vertical column steel bars to form an integral steel bar cage, and reserving a prefabricated root key pushing hole;
a reinforcement cage is placed downwards, and the accurate placement position is ensured;
carrying out jacking work of the prefabricated root keys in a layered manner;
connecting steel slabs through screws on prefabricated steel component wing plates, wherein the steel slabs penetrate through the steel reinforcement cage of the upright column section and form integral connection;
and pouring concrete until the upright post bodies and the steel wing plates form a reliable whole, paying attention to measuring and positioning the embedded connecting pieces when the pouring is nearly finished, and then pouring the rest part of concrete and maintaining the foundation.
3. 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 root key pushing equipment with the positioning support consists of three parts, namely a reaction frame, a jack and a conical pressing piece, and is suitable for the jacking of the prefabricated root key of the foundation with the 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 fixed 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 prefabricated root key type wing plate foundation for the power transmission line can effectively improve the vertical bearing capacity and the lateral rigidity of the foundation, reduce the length and the diameter of a pile foundation pile, and cancel the bottom expansion of a conventional foundation, thereby reducing the safety risk, the construction difficulty and the engineering quantity of foundation construction, reducing the concrete transportation engineering quantity of traffic-unfavorable areas such as mountainous areas and the like, and achieving the purposes of safety, reliability, cost saving and environment protection.
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.
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 (10)
1. A construction method of a prefabricated root key type wing plate foundation is characterized by comprising the following steps:
firstly, measuring and positioning a foundation center, and marking the position and the outline of the concrete wing plate on the ground surface;
according to the wing plate profile marked on the ground, embedding the thin steel plates in sequence from two sides to the end part until the bottom of the thin steel plate is flush with the designed lower plane of the wing plate;
starting basic hole forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body (1);
determining the boundary of the wing plate according to the pre-embedded thin steel plate, and digging out the space of the wing plate (2);
binding the steel bars of the vertical column body (1) and the wing plate (2) to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
jacking the prefabricated root key (3) in layers;
pouring concrete until the vertical column body and the wing plate are formed in a one-step pouring mode; the wing plates (2) of the cast-in-place concrete members are uniformly arranged on the vertical column body (1), and the wing plates (2) are vertically intersected with the vertical column body (1) and are close to the top; a plurality of prefabricated root keys (3) are connected perpendicularly in the stand column body (1) outside, and prefabricated root key (3) extend to the outside from stand column body (1) inside.
2. A construction method of a prefabricated root key type wing plate foundation is characterized by comprising the following steps:
the wing plate (2) of the prefabricated steel component is welded or bolted with a prefabricated screw (5);
measuring and positioning the center of the foundation, and marking the position and the outline of the wing plate (2) on the ground surface;
starting basic hole forming, and excavating sequentially from top to bottom until reaching the pre-excavation depth of the vertical column body (1);
according to the ground surface mark, mechanically and gradually pressing the steel member wing plates until the design depth is reached;
binding the steel bars of the vertical column body (1) to form an integral steel bar cage, and reserving a root key pushing hole; putting down a reinforcement cage;
jacking the prefabricated root key (3) in layers;
a steel plate strip (6) is put in and penetrates through a reinforcement cage of the vertical column body (1) to be connected with the screw rods (5) on the two opposite wing plates (2), so that the two wing plates (2) and the wing plates and the reinforcement cage are integrally connected;
pouring concrete until the vertical column body and the steel wing plate form a reliable whole; the wing plates (2) are uniformly arranged on the vertical column body (1), and the wing plates (2) are vertically intersected with the vertical column body (1) and are close to the top; a plurality of prefabricated root keys (3) are connected perpendicularly in the stand column body (1) outside, and prefabricated root key (3) extend to the outside from stand column body (1) inside.
3. The construction method of the prefabricated root key type vane foundation according to claim 1 or 2, wherein: the wing plates (2) are arranged in a central symmetry mode through the vertical column body (1), the wing plates (2) are cast-in-place concrete components or prefabricated steel components, and the planar shapes of the wing plates (2) are triangular, rectangular or trapezoidal.
4. The construction method of the prefabricated root key type vane foundation according to claim 1 or 2, wherein: prefabricated root key (3) hoop symmetry vertical distribution or adopt upper and lower multilayer staggered arrangement in the stand body (1) outside.
5. The construction method of the prefabricated root key type vane foundation according to claim 4, wherein: 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 wing plate and the top surface of the first layer of prefabricated root keys is not less than one time of the length of the prefabricated root keys.
6. The construction method of the prefabricated root key type vane foundation according to claim 1 or 2, wherein: 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 construction method of the prefabricated root key type vane foundation according to claim 1 or 2, 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 method of constructing a prefabricated root-key type vane foundation of claim 7, wherein: 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 method of constructing a prefabricated root-key type vane foundation of claim 7, wherein: 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 method of constructing a prefabricated root-key type vane foundation of claim 7, wherein: the prefabricated root key (3) is a cross-shaped metal component formed by welding strip-shaped steel.
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