CN216108594U - A assembled metal support basis for 330kV transmission line engineering - Google Patents

Abstract

The utility model discloses an assembled metal support foundation for 330kV transmission line engineering, which comprises a tower foot plate, a metal support, a support inclined strut, a cross beam and a foundation bottom plate, wherein the tower foot plate is fixedly connected with the metal support; the whole body is of a rectangular pyramid structure, the metal supports are positioned on the ridge lines of the rectangular pyramid, the tower foot plates are arranged at the top ends of the metal supports, and two ends of each support diagonal brace are connected with two adjacent metal supports; the metal bracket is arranged on the cross beam, and the cross beam is arranged on the foundation bottom plate; the assembled metal support foundation for the 330kV power transmission line engineering is integrally in the form of a quadrangular pyramid, adopts all-metal components, and is simple in structure and clear in force transmission; the assembly can be carried out in a factory and on the site, and the disassembly and the transportation are convenient; the concrete need not to pour and the basis maintenance is carried out to this basis, and factory's processing can be realized to the fabricated foundation to spare part form is transported to the job site, all can adopt bolted connection, and on-the-spot equipment can carry out the foundation ditch excavation in the time of the component processing simultaneously, can shorten the time limit for a project by a wide margin.

Description

A assembled metal support basis for 330kV transmission line engineering

Technical Field

The utility model relates to the technical field of power transmission line towers, in particular to an assembled metal support foundation for 330kV power transmission line engineering.

Background

In recent years, due to changes in climatic or geological conditions, there have been projects requiring a very urgent construction period, such as rush repairs of 330kV lines. The conventional foundation form of 330kV transmission line engineering mainly comprises a plate foundation and a manual hole digging type foundation, the foundation forms are reinforced concrete structure forms, on-site reinforcement binding, concrete pouring and concrete curing are required, the working hours of the working procedures are more, and the situation that time shortage is caused by adopting the reinforced concrete foundation when the construction period is tight is met.

The prefabricated assembly type foundation is increasingly widely applied to the power transmission line, links such as cast-in-place concrete and maintenance are saved, the construction period is greatly shortened, meanwhile, the acting force of the 330kV power transmission line foundation is small, and the corresponding foundation size is small, so that the problem of short construction period can be solved by adopting a novel assembly type foundation; in addition, the construction process is limited to a certain extent due to the inconvenience of electricity in many places where the power transmission line passes.

SUMMERY OF THE UTILITY MODEL

The utility model provides an assembled metal support foundation for 330kV transmission line engineering in order to solve the existing problems, and the assembled metal support foundation can be assembled in a factory processing field and is convenient to disassemble and transport; the foundation does not need to be poured with concrete and maintained, can greatly shorten the construction period and is convenient to be connected with a metal component.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: an assembled metal support foundation for 330kV transmission line engineering comprises a tower foot plate, a metal support, a support inclined strut, a cross beam and a foundation bottom plate; the whole body is of a rectangular pyramid structure, the metal supports are positioned on the ridge lines of the rectangular pyramid, the tower foot plates are arranged at the top ends of the metal supports, and two ends of each support diagonal brace are connected with two adjacent metal supports; the metal bracket is arranged on the cross beam, and the cross beam is arranged on the foundation bottom plate; the tower foot plate is provided with foundation bolts, or the top surface of the tower foot plate is welded with a connecting plate, the connecting plate is provided with bolt holes, and the bottom of the tower body is connected with the tower foot plate through bolts.

The metal support is of an angle steel structure, the bottom surface of the tower foot plate is provided with a shoe plate, bolt holes are formed in the upper end of the metal support and the shoe plate, and the metal support is connected with the tower foot plate through the shoe plate and bolts.

The tower baseboard is square in cross section, and the material of tower baseboard is Q355, reserves rag bolt hole on the tower baseboard, connects superstructure through rag bolt.

The foundation slab comprises a plurality of parallel structural steels, and the cross beam is vertical to the length direction of the structural steels.

The foundation bottom plate is made of an I-shaped steel beam, is connected with the cross beam through bolts, is made of Q355, and is internally provided with a stiffening plate.

The cross beam is a double-limb angle steel member and is made of Q355, a connecting plate is arranged in the cross beam, a shoe plate is welded on the connecting plate, bolt holes are formed in the lower end of the metal support and the shoe plate, and the cross beam is connected with the connecting plate through the shoe plate and the bolts; the metal support is connected with the connecting plate through a bolt.

And a stiffening plate is arranged at the joint of the boot plate and the connecting plate.

The joint of the upper end of the bracket diagonal brace and the metal bracket is provided with a cross brace, and the two ends of the cross brace are connected with the metal bracket.

Compared with the prior art, the utility model has at least the following beneficial effects: the assembled metal support foundation for the 330kV power transmission line engineering, provided by the utility model, is integrally in a quadrangular pyramid shape, adopts all-metal components, and is simple in foundation structure form and clear in force transmission; foundation bolts are arranged on the tower foot plates, or connecting plates are welded on the top surfaces of the tower foot plates, bolt holes are formed in the connecting plates, and the bottom of the tower body is connected with the tower foot plates through the bolts; the foundation type can be assembled in a factory processing field, is convenient to disassemble and transport, adopts bolt connection when the upper structures are connected, does not need additional equipment, and has no limit on the installation process; the foundation does not need to be poured with concrete and maintained, and the construction period can be greatly shortened.

Principle analysis of the advantages of the fabricated metal base: the conventional strut plate type reinforced concrete foundation generally needs to be subjected to the process flows of foundation pit excavation, formwork erecting, reinforcing steel bar binding, concrete pouring, foundation curing, foundation pit backfilling and the like, when the iron tower is disassembled and assembled, the compressive strength of the concrete can reach 70% of the designed strength, the subsequent processes of foundation pit backfilling, upper tower assembling and the like can be carried out, the general foundation curing time is not less than 7d, certain curing measures are needed if necessary, the assembled foundation can be processed in a factory and transported to a construction site in a part form, the foundation pit backfilling can be carried out only after the assembly is completed on the site, and the foundation pit excavation can be carried out while the members are processed; therefore, a large amount of time can be saved, and particularly, the construction period can be greatly saved by using the basic form in the engineering with tight construction period, such as the line engineering of emergency repair and the like.

Drawings

FIG. 1a is a schematic elevation view of an assembled metal support base structure for 330kV transmission line engineering;

FIG. 1b is a schematic top view of FIG. 1 a;

FIG. 2 is a schematic view of a footing plate of the fabricated metal bracket foundation;

FIG. 3 is a cross-sectional view of a fabricated metal bracket tower foot;

FIG. 4 is a schematic view of the connection of the metal bracket and the cross beam;

FIG. 5 is a cross-sectional view of the metal bracket and beam connection 2-2;

FIG. 6 is a schematic bottom plate view of a metal fabricated foundation;

FIG. 7 is a schematic view of the connection of a metal fabricated foundation slab to a beam;

FIG. 8 is a schematic view of a metal fabricated base frame under load;

FIG. 9 is a schematic view of the stress of the metal fabricated base beam and the bottom plate;

in the figure: 1-a pylon foot plate; 2-a metal stent; 3-a bracket diagonal bracing; 4-a cross beam; 5-a foundation slab.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1a, 1b and 2, the assembled metal support foundation for 330kV transmission line engineering of the utility model is a steel structure, is integrally in a quadrangular pyramid form, and comprises a foundation bottom plate 5 and a beam 4 connected to the foundation bottom plate 5, wherein the foundation bottom plate 5 is connected with the beam 4 through a bolt; the cross beam 4 is connected with the metal bracket 2 through a connecting plate; four metal supports 2 are arranged, the four metal supports 2 are respectively positioned on four edges of a rectangular pyramid, the supports are connected and supported through support diagonal braces 3, the lower ends of the support diagonal braces 3 are connected with a cross beam 4, the upper ends of the support diagonal braces 3 are connected with the metal supports 2, cross braces are arranged at the joints of the support diagonal braces 3 and the metal supports 2, and the two ends of each cross brace are connected with the metal supports 2; the top of the metal bracket 2 is provided with a tower foot plate 1, and the tower foot plate 1 is used for connecting an upper structure.

Referring to fig. 2 and 3, a tower foot plate 1 connected with the upper structure is square, four foundation bolt connecting holes are reserved, and the tower foot plate is made of Q355; the lower part of the tower foot plate is provided with a T-shaped welded shoe plate, the thickness of the shoe plate is the same as that of a main material of the tower foot plate, and the material is Q355; the shoe plate is connected with the metal bracket through bolts, and as an example, the shoe plate is connected with the metal bracket through 12 bolts, which are M20 in specification and are arranged in a single row.

Referring to fig. 4, the cross beam 4 is a pair of angle steels arranged in the same direction, the metal bracket 2 is connected with the cross beam 4 through a connecting plate, and a shoe plate is welded on the upper part of the connecting plate and is connected with the metal bracket through a bolt.

Referring to fig. 5, the foundation slab has a square cross section and is made of Q355, and four bolt connection holes are reserved in the foundation slab and are used for connecting the beam and the i-steel slab.

Referring to fig. 6, the foundation slabs 5 are vertically and uniformly arranged with the beams, and the number of the foundation slabs 5 can be properly adjusted according to the foundation acting force;

referring to fig. 7, the cross-sectional shape of the foundation slab 5 is i-steel, the material of the i-steel is Q355, stiffening plates are uniformly arranged inside the i-steel, the stiffening plates are made of Q235, and the foundation slab 5 is connected with the cross beam 4 through bolts.

Referring to fig. 8 and 9, the prefabricated assembly type foundation metal support mainly bears axial force, the foundation slab and the cross beam 4 bear bending moment, and the foundation design firstly carries out overall upward pulling, downward pressing and overturning calculation of the foundation according to the routine specifications such as the building foundation design specification and the overhead transmission line design technical specification; and then, calculating the internal force of the foundation bottom plate 5, the cross beam 4 and the metal bracket 2 of the foundation member, shearing the bolt and calculating the hole wall pressure bearing in sequence.

The assembly steps of the prefabricated metal bracket foundation of the utility model are as follows:

according to the size of a foundation, prefabricating a tower foot plate 1, a metal support 2, a cross beam 4 and a foundation bottom plate 5 in a factory, and meanwhile, correspondingly equipping all prefabricated components such as connecting bolts, stiffening plates, support inclined struts, cross support accessories and the like;

transporting the prefabricated parts to a construction site;

simultaneously carrying out foundation pit excavation according to the size of the foundation, carrying out foundation treatment and leveling after excavation to the designed depth;

sequentially mounting foundation components such as a foundation bottom plate 5, a double-limb angle steel crossbeam 4, a metal bracket 2, a tower foot plate 1 and the like from bottom to top;

fixing and installing foundation bolts;

and backfilling and tamping the foundation pit.

During the concrete implementation, according to the prefabricated in-process of actual conditions worker's component, also can transport in step, also can carry out foundation ditch excavation simultaneously by the size of component.

The prefabricated assembly type foundation has the advantages of light self weight, small volume of the spliced components, no need of concrete pouring and maintenance due to the adoption of an all-metal structure, guaranteed foundation quality, shortened construction period and increased applicability of the prefabricated assembly type foundation under complex environmental conditions such as construction period emergency and the like.

It should be understood that the above description is only a preferred embodiment of the present invention, and that modifications can be made by those skilled in the art without departing from the principle of the present invention.

Claims (8)

1. An assembled metal support foundation for a 330kV power transmission line project is characterized by comprising a tower foot plate (1), a metal support (2), a support inclined strut (3), a cross beam (4) and a foundation bottom plate (5); the whole body is of a rectangular pyramid structure, the metal support (2) is positioned on the edge line of the rectangular pyramid, the tower foot plate (1) is arranged at the top end of the metal support (2), and two ends of the support inclined strut (3) are connected with two adjacent metal supports; the metal support (2) is arranged on the cross beam (4), and the cross beam (4) is arranged on the foundation bottom plate (5); the tower foot plate (1) is provided with foundation bolts, or the top surface of the tower foot plate (1) is welded with a connecting plate, the connecting plate is provided with bolt holes, and the bottom of the tower body is connected with the tower foot plate (1) through bolts.

2. The assembled metal bracket foundation for the 330kV power transmission line engineering as claimed in claim 1, wherein the metal bracket (2) is of an angle steel structure, a shoe plate is arranged on the bottom surface of the tower foot plate (1), bolt holes are respectively formed in the upper end of the metal bracket (2) and the shoe plate, and the metal bracket (2) is connected with the tower foot plate (1) through the shoe plate and the bolts.

3. The assembled metal support foundation for the 330kV power transmission line engineering as claimed in claim 2, wherein the tower foot plate (1) is of a square section, the tower foot plate (1) is made of Q355, and an upper structure is connected through foundation bolts, wherein foundation bolt holes are reserved in the tower foot plate (1).

4. The assembled metal support foundation for 330kV power transmission line engineering as claimed in claim 1, wherein the foundation bottom plate (5) comprises a plurality of parallel-arranged section steels, and the cross beams (4) are perpendicular to the length direction of the section steels.

5. The assembly type metal support foundation for the 330kV power transmission line engineering as claimed in claim 1, wherein the foundation slab (5) is an I-shaped steel beam, the foundation slab (5) is connected with the cross beam (4) through bolts, the foundation slab (5) is made of Q355, and a stiffening plate is arranged in the I-shaped steel beam.

6. The assembly type metal bracket foundation for the 330kV power transmission line engineering as claimed in claim 1, wherein the cross beam (4) is a double-limb angle steel member made of Q355, a connecting plate is arranged in the cross beam (4), a shoe plate is welded on the connecting plate, bolt holes are respectively formed in the lower end of the metal bracket (2) and the shoe plate, and the cross beam (4) is connected with the connecting plate through the shoe plate and the bolts; the metal bracket (2) is connected with the connecting plate through a bolt.

7. The fabricated metal bracket foundation for 330kV power transmission line engineering as claimed in claim 6, wherein a stiffener is arranged at the joint of the shoe plate and the connecting plate.

8. The assembled metal support foundation for the 330kV power transmission line engineering as claimed in claim 1, wherein a cross brace is arranged at the joint of the upper end of the support diagonal brace (3) and the metal support (2), and the two ends of the cross brace are connected with the metal support (2).

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