CN110541428A - A basic structure of a substation power distribution device building - Google Patents

Abstract

This application discloses a basic structure of a power distribution device building in a substation. The basic structure includes a raft slab poured with several first steel bars and concrete, and a column pier arranged on the raft slab. The column pier includes: a cross steel frame, a cross The steel frame is laid flat and buried in the raft, and the cross steel frame is welded and fixed to the adjacent first steel bar in the raft; the cross fixing seat is welded and fixed on the central area of the top surface of the cross steel frame; box-shaped column, box-shaped The column is vertically fixed on the central area of the top surface of the cross steel frame, and the bottom edge of the box column has a card slot that matches the cross fixing seat. The inside of the box column is a concrete filling area, and the outer peripheral surface of the box column A number of studs are welded on the top; the column foot reinforced pier is poured with several second steel bars and concrete, and wrapped at the bottom of the box column. The second steel bar includes a plurality of Longitudinal bars and multiple stirrups connecting multiple longitudinal bars.

Description

A basic structure of a substation power distribution device building

technical field

The invention relates to the construction field, in particular to a basic structure of a power distribution device building of a substation.

Background technique

In recent years, with the formation of my country's intensive urbanization development strategy, various industrial and civil buildings have been greatly developed. In order to make full use of the performance of materials, people have introduced a composite structure system of steel pipe concrete on the basis of the original reinforced concrete structure system. The confinement effect puts the concrete in a state of three-way stress, so that the strength of the concrete is improved, the brittleness is reduced, and the plasticity and toughness are greatly improved; at the same time, due to the deformation of the concrete, the steel pipe is also in a complex stress state, and the steel pipe is strengthened. wall stability.

At present, there are many studies on the beam-column joints of the concrete-filled steel tube superstructure, but the column-foot form of the steel structure is still used for the foundation column-foot joints, and there is no design of the column-foot foundation according to the characteristics of the steel-filled steel tube concrete structure.

More importantly, the state stipulates that the site selection of substations should "conform to the relevant national land use policies, and make use of the original wasteland, slopes, and bad land as much as possible." Due to poor geological conditions, this puts forward higher requirements for the basic structure of substations.

The inventors found that the raft foundation has good site applicability, can make full use of the bearing capacity of the site soil, and is very suitable for foundations with poor geological conditions. The foundation form of column pier plus raft is suitable for various structural forms because of its flexible layout. The substation power distribution device building generally adopts a frame structure. Due to the installation of equipment, the load of some column feet is relatively large, and column foot nodes and foundation structures with higher bearing capacity are required.

Contents of the invention

The present application discloses a basic structure of a power distribution device building in a substation. The basic structure includes a raft made of several first steel bars and concrete, and a pier arranged on the raft. The pier includes :

A cross steel frame, the cross steel frame is laid flat and buried in the raft, and the cross steel frame is welded and fixed to the adjacent first steel bar in the raft;

A cross fixing seat, the cross fixing seat is welded and fixed on the central area of the top surface of the cross steel frame;

A box-shaped column, the box-shaped column is vertically fixed on the central area of the top surface of the cross steel frame, and the bottom edge of the box-shaped column has a card slot matched with the cross fixing seat, the box-shaped column The interior of the column is a concrete filling area, and a plurality of studs are welded on the outer peripheral surface of the box-shaped column;

The column foot reinforced pier, the column foot reinforced pier is poured with several second steel bars and concrete, and wrapped around the bottom of the box-shaped column, the second steel bar includes a plurality of steel bars arranged on the outer periphery of the box-shaped column A longitudinal reinforcement and multiple stirrups connecting the plurality of longitudinal reinforcements.

The following also provides several optional ways, but they are not used as additional limitations on the above-mentioned overall scheme, but are only further additions or optimizations. On the premise of no technical or logical contradiction, each optional way can be carried out independently for the above-mentioned overall scheme Combination can also be a combination of multiple options.

Preferably, the plurality of longitudinal ribs extend downwards and have the following connection methods:

Method 1: burying to the bottom of the raft;

Method 2: Welding with the cross steel frame.

Preferably, the plurality of longitudinal ribs extend downward to the bottom of the cross steel frame.

Preferably, the plurality of longitudinal ribs extend downward, and the plurality of longitudinal ribs are welded to the top surface of the cross steel frame after being bent at the position where they meet the cross steel frame.

Preferably, the cross fixing seat includes two fixed steel plates vertically arranged, and the first steel bar is welded to the facade of the fixed steel plate after being bent at the position where it meets the fixed steel plate.

Preferably, both the longitudinal direction and the transverse direction of the cross fixing seat extend to the outside of the box-shaped column.

Preferably, the first steel bar is woven into a reinforcement mesh sheet, and the reinforcement mesh sheet at least includes an upper reinforcement mesh sheet close to the top surface of the raft and a lower reinforcement mesh sheet close to the bottom surface of the raft, and the cross steel mesh The frame is accommodated between the upper steel mesh sheet and the lower steel mesh sheet.

Preferably, two longitudinal steels of the cross steel frame are symmetrically welded on both sides of a horizontal steel, and the longitudinal and transverse lengths of the cross steel frame are equal.

Preferably, both longitudinal and lateral sides of the cross steel frame are provided with leveling devices, and the leveling devices include:

Leveling plate, connected with the cross steel frame;

A leveling screw runs through the leveling plate;

a support plate arranged at the bottom of the leveling screw;

The upper leveling nut is threaded on the leveling screw and the lower surface is against the leveling plate;

The lower leveling nut is threaded on the leveling screw rod and the upper surface is against the leveling plate.

Preferably, the leveling screw passes through the lower mesh, and the support plate and the leveling plate are respectively located on both sides of the lower mesh.

The technical solutions disclosed in this application at least include the following beneficial technical effects:

1. The raft foundation form is selected, with strong integrity and small uneven settlement;

2. The raft foundation scheme has strong adaptability to the site, whether it is a natural foundation, a composite foundation or a pile foundation;

3. The raft reinforcement adopts the combination of concealed beam and uniform reinforcement, which can resist the bending moment of the floor more effectively;

4. The structure of the cross steel frame embedded with cross steel beams under the column can make the surface of the foundation smooth and facilitate the installation of other ground equipment;

5. Since the upper steel column is directly connected to the cross steel frame embedded in the raft, the force transmission of the pier is more direct and effective (compared with the original outsourcing column foot, the steel column transmits force to the outsourcing reinforced concrete, and then the outsourcing reinforced concrete column transmits force. to the foundation, the force transmission is not direct); the structural form of the embedded cross steel frame under the column is used to increase the punching and shearing bearing capacity of the column pier by 15%; the bending and shearing bearing capacity is improved; In the reinforced concrete raft, the structural ductility of the pier can be improved, and the risk of brittle sudden failure can be reduced;

6. The structure of the column foot structure (ie column pier) in this basic structure is simple in structure and convenient in construction. The cross steel frame and the bottom part of the column can be directly processed in the factory, and the leveling device is used for positioning and leveling on site. At the same time, it can be used as a support for the upper steel bar of the raft, which is convenient for construction.

7. Common foundation. Because the 220kV power distribution device building and the 110kV power distribution device building adopt a common foundation, the size of the raft is the same, the reinforcement is the same, and the only difference is the column position, which can reduce the design workload and facilitate construction materials.

The beneficial technical effect of the specific structure will be explained in detail in the specific implementation.

Description of drawings

Fig. 1 is the schematic diagram that basic structure is applied in 220KV substation in an embodiment;

Fig. 2 is a schematic diagram of the pier structure in Fig. 1;

Fig. 3 is a schematic diagram of the structure of the cross steel frame in Fig. 2;

Fig. 4 is a schematic structural diagram of the leveling device in Fig. 3 .

The reference signs in the figure are explained as follows:

11. The first steel bar; 12. The second steel bar; 121. Longitudinal bar; 122. Stirrup; 2. Raft; 3. Column pier; 31. Cross steel frame; 311. Transverse steel; 312. Longitudinal steel; Cross fixing seat; 33, box column; 331, stud; 34, column base reinforced pier; 35, leveling device; 351, leveling plate; 352, leveling screw; 353, support plate; 354, upper leveling nut; 355, lower the leveling nut.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that when a component is said to be "connected" to another component, it may be directly connected to the other component or intervening components may also exist. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time.

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

Referring to Figures 1 to 4, the present application discloses a basic structure of a power distribution device building in a substation, the basic structure includes a raft 2 poured with several first steel bars 11 and concrete, and a pier 3 arranged on the raft 2 , pier 3 includes:

The cross steel frame 31, the cross steel frame 31 is flatly buried in the raft 2, and the cross steel frame 31 is welded and fixed with the adjacent first steel bars 11 in the raft 2;

Cross fixing seat 32, cross fixing seat 32 is welded and fixed on the central area of cross steel frame 31 top surface;

Box-shaped column 33, box-shaped column 33 is erected and fixed on the central area of the top surface of cross steel frame 31, and the bottom edge of box-shaped column 33 has a draw-in groove welded with cross holder 32 (not shown in the figure, with cross fixing seat welding), the inside of the box-shaped column 33 is a concrete filling area, and a plurality of studs 331 are welded on the outer peripheral surface of the box-shaped column 33;

The column foot reinforced pier 34, the column foot reinforced pier 34 is poured by several second steel bars 12 and concrete, and wrapped in the bottom of the box-shaped column 33, the second steel bar 12 includes a plurality of longitudinal bars arranged on the outer periphery of the box-shaped column 33 121 and multiple stirrups 122 connecting multiple longitudinal bars 121.

Only one pier 3 is marked in Fig. 1, and other positions are omitted. The technical solution disclosed in the application is directly connected to each other through the cross steel frame 31, the cross fixing seat 32, the box-shaped column 33, and the second steel bar 12 in the column base reinforced pier 34, so that the force transmission of the column pier 3 is more direct and effective ( Compared with the original outsourcing column foot, the steel column transmits the force to the outsourcing reinforced concrete, and then the outsourcing reinforced concrete column transmits the force to the foundation, and the force transmission is not direct); the structural form of the cross steel frame 31 embedded under the column is adopted to improve the resistance of the column pier 3 Punching shear bearing capacity 15%.

Simultaneously, the scheme structure of the column foot structure (ie column pier 3) is simple and convenient for construction. The cross steel frame 31 and the bottom part of the column can be directly processed in the factory, and the leveling device 35 is used for positioning and leveling on the spot, and can be used as a support for the upper steel bar of the raft 2 at the same time, which is convenient for construction.

The technical solution disclosed in this application not only optimizes the mechanical performance of a single pier 3, but also optimizes the installation and construction process of the pier 3, greatly improving the construction efficiency.

In one embodiment, a plurality of longitudinal ribs 121 extend downwards and have the following connection methods:

Method 1: Buried to the bottom of the raft 2;

Method 2: Welding with the cross steel frame 31.

In practical settings, multiple modes may exist simultaneously. For example, in the embodiment shown in the figure, a plurality of longitudinal ribs 121 extend downwards, and the longitudinal ribs 121 meeting the cross steel frame 31 are welded with the top surface of the cross steel frame 31 after being bent at the meeting position, and welded with the first steel bar The longitudinal reinforcement 121 where 11 meets is welded to the first reinforcement 11 after being bent at the meeting position, and the rest are buried to the bottom of raft 2 .

Of course, there may be only one or two connection modes.

In one embodiment, the plurality of longitudinal ribs 121 extend downward to the bottom of the cross steel frame 31 . In this embodiment, the longitudinal rib 121 that interferes with other components bypasses the interference device and extends below the cross frame 31 .

In one embodiment, a plurality of longitudinal ribs 121 extend downwards, and the plurality of longitudinal ribs 121 are welded to the top surface of the cross steel frame 31 after being bent at the position where they meet the cross steel frame 31 . In this embodiment, the longitudinal ribs 121 that do not meet the cross steel frame 31 originally can be bent and welded to the cross steel frame 31 .

Various connection methods can be implemented as required, and in principle, the strength of the pier 3 and the convenience of installation need to be ensured.

The stability of the box column 33 is provided by the cross fixing seat 32 in addition to the column base reinforcement pier 34 . In one embodiment, the cross fixing seat 32 includes two fixed steel plates vertically arranged, and the first steel bar 11 is welded to the vertical surface of the fixed steel plates after bending at the position where they meet the fixed steel plates.

After the first steel bar 11 is welded to the facade of the fixed steel plate, it can provide support for the fixed steel plate to resist the falling of the box-shaped column 33 , thereby improving the stability of the cross fixing seat 32 .

Analyzing from the principle of mechanics, the larger the size of the cross fixing seat 32 is, the better the stability of the box column 33 is. However, from a practical point of view, the size of the box-shaped column 33 is generally limited. Therefore, in one embodiment, the cross fixing seat 32 extends to the outside of the box-shaped column 33 both longitudinally and transversely. The mechanical properties of the cross fixing seat 32 are improved by enlarging the connection projected area of the cross fixing seat 32 and the cross steel frame 31 .

The force of the pier 3 will eventually be transmitted to the raft 2 after conduction. In one embodiment, the first steel bar 11 is woven into a reinforcement mesh, and the reinforcement mesh at least includes an upper sheet near the top surface of the raft 2 and a The lower net sheet on the raft 2 bottom surface, the cross steel frame 31 is accommodated between the upper net sheet and the lower net sheet.

The upper mesh and the lower mesh form a clamping space-constrained cross steel frame 31, thereby connecting the pier 3 and the raft 2 to form a rigid node, and improving the overall performance of the foundation structure.

The connection design form of the cross steel frame 31 will also affect the mechanical performance of the pier 3. In one embodiment, two longitudinal steels 312 of the cross steel frame 31 are symmetrically welded on both sides of a horizontal steel 311, and the cross steel frame 31 The vertical and horizontal lengths are equal.

The purpose of welding the longitudinal steel 312 and the transverse steel 311 to form the cross steel frame 31 is to facilitate construction. The longitudinal and horizontal lengths of the cross steel frame 31 are equal in order to provide the pier 3 with consistent mechanical performance in all directions. In specific implementation, because Due to construction errors and other reasons, there may be slight errors in the longitudinal and transverse lengths of the cross steel frame 31, and they are not necessarily strictly equal.

During the construction of the foundation structure, the errors accumulated everywhere need to be released. In one embodiment, the longitudinal and lateral sides of the cross steel frame 31 are provided with leveling devices 35, and the leveling devices 35 include:

The leveling plate 351 is connected with the cross steel frame 31;

The leveling screw 352 runs through the leveling plate 351;

The support plate 353 is arranged at the bottom of the leveling screw 352;

The upper leveling nut 354 is threaded on the leveling screw rod 352 and the lower surface is against the leveling plate 351;

The lower leveling nut 355 is threaded on the leveling screw rod 352 and the upper surface is against the leveling plate 351 .

The leveling device 35 can adjust the levelness of the cross steel frame 31 relative to the raft 2 by adjusting the relative positions of the upper leveling nut 354 and the lower leveling nut 355, thereby eliminating errors and providing stable performance. The design of the leveling device 35 enables the production of the steel structure of the pier 3 and the construction on the construction site to be independent, and the steel structure of the pier 3 can be transported to the construction site after mass production in the factory, which greatly improves the construction efficiency.

In addition to leveling, the leveling device 35 can also achieve additional functions. In one embodiment, the leveling screw 352 passes through the lower mesh, and the support plate 353 and the leveling plate 351 are respectively located on both sides of the lower mesh.

In this embodiment, the support plate 353 is placed on the top surface of the foundation. After the concrete is filled, the leveling screw 352 acts as a hook to further provide a stable connection effect for the cross steel frame 31 .

In terms of specific parameter selection, the raft 2 of the foundation structure is a flat plate with a thickness of not less than 500 mm. The top and bottom of the raft 2 at the axis are densely packed as hidden beams, and the width of the hidden beams is not less than 1200 mm. The top is equipped with evenly distributed steel bars. Since the 220kv power distribution device building column and the 110kv power distribution device building column position have concealed beams with reinforced reinforcement, the basic structure can be used for both types of power distribution device buildings.

The technical solution disclosed in this application can effectively enhance the mechanical properties of the pier through calculation and field exploration. The calculation process is as follows:

Take the center column as an example:

Column section 1000mmx1000mm

Concrete grade C35

Plate thickness 500mm. The thickness of the protective layer is 50mm.

Calculation height h0=435mm

1. The bearing capacity of the bottom plate without adding cross steel frame is calculated according to "Code for Design of Concrete Structures" GB50011-2010:

Punching shear bearing capacity of bottom plate:

F _el ＝0.7β _h ηu _m h ₀

β _h = 1.0

β _s =2

α _s =40

η=Min{η ₁ ,η ₂ }=1.0

u _m =4×(1000+h ₀ )=5740mm

F _el ＝0.7β _h f _t ηu _m h ₀ ＝0.7×1.0×1.57×1.0×5740×435＝2744kN

2. After adding the cross steel frame, the bearing capacity is calculated according to "Code for Design of Unbonded Prestressed Concrete Structures" JGJ92-2016:

After adding the shear cross steel frame, the section of the cross steel frame is H350x250x9x14

The length of the cross steel frame extends 1200mm outside the column section.

Punching shear bearing capacity of bottom plate:

F _e ′ _l ＝0.6f _t ηu _m h ₀ ＝0.6×1.57×1.0×7918×435＝3244kN

18% increase in bearing capacity

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification. When the technical features in different embodiments are embodied in the same drawing, it can be considered that the drawing also discloses the combination examples of the various embodiments involved.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. The utility model provides a foundation structure of distribution device building of transformer substation, its characterized in that, foundation structure includes the raft with a plurality of first reinforcing bars and concrete placement, and arranges column pier on the raft, the column pier includes:

The cross steel frame is tiled and embedded in the raft plate, and the cross steel frame is welded and fixed with the adjacent first reinforcing steel bars in the raft plate;

the cross fixing seat is welded and fixed in the central area of the top surface of the cross steel frame;

the box-type column is vertically fixed in the central area of the top surface of the cross steel frame, the bottom edge of the box-type column is provided with a clamping groove welded with the cross fixing seat, a concrete filling area is arranged inside the box-type column, and a plurality of studs are welded on the outer peripheral surface of the box-type column;

pier is strengthened to the column base, pier is strengthened by a plurality of second reinforcing bars and concrete placement, and parcel is in to the column base the bottom of box column, the second reinforcing bar is including arranging many of box column periphery are indulged the muscle and are connected many are indulged the multichannel stirrup of muscle.

2. The substructure of claim 1, wherein the plurality of longitudinal bars extend downward and have the following connections:

The first method is as follows: burying the raft plate at the bottom of the raft plate;

The second method comprises the following steps: and welding with a cross steel frame.

3. The substructure of claim 1, wherein the plurality of longitudinal bars extend downwardly below the cross-steel frame.

4. The substructure of claim 1, wherein the plurality of longitudinal bars extend downward and are welded to the top surface of the cross steel frame after bending at the locations where the longitudinal bars meet the cross steel frame.

5. The foundation structure as claimed in claim 1, wherein the cross fixing seat comprises two fixing steel plates arranged vertically, and the first steel bar is welded with the vertical surface of the fixing steel plate after being bent at the position meeting the fixing steel plates.

6. The substructure of claim 1, wherein the cross mounts extend both longitudinally and transversely outside the box columns.

7. the foundation structure of claim 1, wherein the first steel bars are woven into a steel bar mesh, the steel bar mesh at least comprises an upper mesh close to the top surface of the raft and a lower mesh close to the bottom surface of the raft, and the cross steel frame is accommodated between the upper mesh and the lower mesh.

8. the substructure of claim 7, wherein the two longitudinal steels of the cross steel frame are symmetrically welded to both sides of a transverse steel, and the longitudinal and transverse lengths of the cross steel frame are equal.

9. the substructure of claim 8, wherein leveling devices are provided at both longitudinal and lateral sides of the cross steel frame, the leveling devices comprising:

The leveling plate is connected with the cross steel frame;

the leveling screw rod penetrates through the leveling plate;

The supporting plate is arranged at the bottom of the leveling screw rod;

the upper leveling nut is in threaded fit with the leveling screw rod, and the lower surface of the upper leveling nut abuts against the leveling plate;

And the lower leveling nut is in threaded fit with the leveling screw rod, and the upper surface of the lower leveling nut abuts against the leveling plate.

10. the infrastructure of claim 9, wherein the leveling screw passes through the lower mesh, and the support plate and the leveling plate are respectively located on both sides of the lower mesh.