CN206116649U - Utilize ground net of steel pipe pole pile foundation set -up - Google Patents

Abstract

The utility model discloses a grounding grid formed by steel pipe rod pile foundations, which includes connecting round steels (3) arranged at intervals in the walls of pile foundation holes (2), and the upper ends of the connecting round steels are connected with the connecting rings (1). , the lower end extends to the bottom of the pile foundation hole, and several layers of horizontal grounding bodies (4) are arranged at intervals in the pile foundation hole wall, and each layer of horizontal grounding bodies is arranged at intervals. One end of the horizontal grounding body extends into the depth of the pile foundation hole wall, and the other end It is connected with the connecting round steel by welding, the outer surface of the connecting round steel does not exceed the surface of the hole wall of the pile foundation, the lower end of the connecting round steel is connected with one end of the longitudinal grounding body (6) by welding, and the other end of the longitudinal grounding body extends into the bottom of the pile foundation hole. The ring is connected with the ground flat iron (12) by the ground down conductor (11). The utility model does not cause construction impact and damage, saves earthwork, reduces construction costs, has a small footprint, compact structure, convenient construction and fabrication, good grounding effect, short construction period, and low construction cost.

Description

A grounding network constructed by using steel pipe pole pile foundation

technical field

The utility model relates to a three-dimensional grounding grid technology, in particular to the application of a three-dimensional grounding grid technology in steel pipe pole pile foundations of power transmission line engineering.

Background technique

With the development of human economy and society, the process of urbanization is accelerating, and residents have new requirements for electricity. Safe, stable and continuous power supply is the basic requirement for power grid construction, and the traditional 10kV power supply can no longer meet the city's power supply needs. At present, 110kV and 220kV substations have penetrated into the city center. The supporting 110kV and 220kV transmission lines, due to the dual constraints of space and economy, mostly use steel pipe poles for overhead transmission lines.

The grounding form of traditional steel pipe poles or angle steel tower overhead transmission lines usually adopts shallow buried metal radiation type horizontal grounding body, or cage grounding with ring and vertical grounding electrodes. The radial horizontal grounding has a long grounding body, a large radiation radius, a large area, and a large amount of earth and stone excavation and burial. Therefore, in the bustling urban areas and residential areas, the above-mentioned grounding forms are difficult to construct, high in investment costs, long in construction period, and cause great damage to surface vegetation and the environment. In areas with high soil resistivity, it is difficult for the grounding resistance to meet the design requirements. .

In order to solve the above-mentioned problems in the grounding form of traditional steel pipe pole overhead transmission lines in urban areas, people have used some new methods: one is to use the pile foundation reinforcement cage of the steel pipe pole itself as the grounding body; The grounding of steel pipe poles is connected step by step to form a grounding grid, or a grounding electrode (resistance reducing agent) is used; the third is to manually excavate grounding grooves around the pile foundation holes of steel pipe poles to form a grounding grid (such as CN 103594826 A). However, these methods have the following problems in actual use:

1. The grounding network formed by using the pile foundation reinforcement cage of the steel pipe pole itself as the grounding body, when encountering a strong lightning current that cannot be diverted in time, it is easier to form a counterattack lightning, causing the transmission line to trip;

2. The grounding network formed by connecting the steel pipe rods to the ground step by step through the grounding round steel needs to excavate the grounding groove in the green belt, which seriously damages the urban greening, and it occupies a large area, and the amount of excavation and burial of earth and stone is large. The cost is high, and at the same time, it will cause safety hazards to the surrounding pipelines;

3. The grounding method is connected step by step. Although the grounding resistance is small, it is easy to generate coupling voltage and damage the safety of the line;

4. The ground electrode or resistance reducing agent will increase the project cost, and the use effect will decrease year by year, requiring multiple investments;

5. The grounding network is constructed by artificially excavating the grounding groove around the pile foundation hole. In order to meet the needs of the project for grounding resistance, the area of the grounding groove is generally more than twice the cross-sectional area of the pile foundation hole. However, grounding in the city The area of the trough is often limited by the site. In actual construction, people generally reduce the excavation of the grounding trough, which will increase the grounding resistance, which will not meet the design requirements and bring safety hazards. Or destroy the surrounding greenery and facilities first, and then restore the surrounding greenery and facilities after the grounding grid is completed. This will increase the construction cost, prolong the construction period, and even cause adverse effects on the surrounding order.

Utility model content

Aiming at the problems caused by people's method of solving the grounding form of the steel pipe rod overhead transmission line, the utility model provides a grounding grid formed by using the steel pipe rod pile foundation of the overhead power transmission line.

The technical solution adopted for the technical problem to be solved by the utility model is: the grounding network formed by the steel pipe pole pile foundation includes connecting round steels vertically arranged in the hole wall of the pile foundation at intervals, and the upper end of the connecting round steel is connected to the connecting round steel. The rings are connected, and the lower end extends to the bottom of the pile foundation hole. Several layers of horizontal grounding bodies are arranged at intervals in the hole wall of the pile foundation hole, and each layer of horizontal grounding bodies is arranged at intervals. Deep inside the inner wall, the other end is welded to the connecting round steel, the outer surface of the connecting round steel does not exceed the inner wall surface of the pile foundation hole, the lower end of the connecting round steel is connected to one end of the longitudinal grounding body by welding, and the other end of the longitudinal grounding body extends into the pile foundation In the bottom of the hole, the connecting ring is welded to the ground flat iron through the ground down-lead.

A steel frame and concrete are arranged in the hole of the pile foundation, and the steel frame includes a vertical main steel frame arranged at intervals and several layers of ring-shaped auxiliary steel frames, and the main steel frame and the auxiliary steel frame adopt The bundles are connected, and anchor bolts are arranged at intervals on the upper end of the main steel frame.

The innovation of the technical solution of the utility model:

1. Make full use of the steel pipe pole pile foundation of the overhead transmission line to form the grounding network, and do not need to dig grounding grooves around the pile foundation hole. Under the condition of ensuring that the grounding resistance requirements are met, the greening and facilities around the pile foundation hole will not be affected. Cause construction impact and damage, reduce earthwork excavation and burial, and reduce engineering construction costs.

2. Through the horizontal grounding body set at intervals in the pile foundation hole wall and the vertical grounding body set at the bottom of the pile foundation hole (generally the groundwater is abundant below 6 meters), it can meet the requirements of the project for grounding resistance.

3. The present invention makes full use of the pile foundation holes of the steel pipe pole itself to build the grounding grid first. After the grounding grid is established, the steel skeleton and concrete are used to pour the steel pipe pole foundation, and the concrete layer is used to separate the steel pipe pole foundation from the grounding grid. (to prevent contact between the grounding grid and the foundation steel bar), the invention has a small footprint, a compact structure, convenient construction and fabrication, good grounding effect, short construction period, and low construction cost.

The components of the grounding grid described in the utility model are somewhat the same or similar to those in the prior art, but the purpose of the present invention is different from that of the prior art. The setting of the steel pipe pole grounding grid needs to excavate a grounding groove around the pile foundation hole whose area is more than twice the cross-sectional area of the pile foundation hole, and the setting of the grounding groove area is usually limited by the lack of urban space. The present invention only needs to use the pile foundation hole of the steel pipe rod itself, and does not need to arrange grounding grooves outside the pile foundation hole of the steel pipe rod, so as to establish a grounding network that meets engineering needs.

Description of drawings

Fig. 1 is the structural representation after the pile foundation hole of the utility model is poured,

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A in Fig. 1,

Fig. 3 is a schematic diagram of the B-B sectional structure of Fig. 1 .

In the figure, 1, connecting ring 2, pile foundation hole 3, connecting round steel 4, horizontal grounding body 5, welding point 6, longitudinal grounding body 7, main steel skeleton 8, auxiliary steel skeleton 9, concrete 10, foundation foot Bolt 11, grounding down conductor 12, grounding flat iron.

detailed description

In Figure 1, Figure 2 and Figure 3, if an overhead power transmission line with a steel pipe pole (electric pole) with a voltage level of 10kV and above is erected in a city, a hole with a diameter of about 2 meters and Pile foundation hole 2 with a depth of 6-12 meters (the size of the pile foundation hole is determined according to the stress of the steel pipe rod and the foundation), and then insert or screw the horizontal grounding body into the pile foundation hole manually and with simple tools In the hole wall of the hole, a layer of horizontal grounding body 4 is set at intervals of two meters along the axis of the pile foundation hole, and each layer of horizontal grounding body is set at intervals of four (or more, determined according to requirements), and the horizontal grounding body adopts 50*50*5 type angle steel, or Φ50 type spiral anchor pile, the length is 0.5 meters, and the front end is made into a 30-degree sharp angle; then four connecting round steels are vertically arranged along the hole wall in the pile foundation hole wall 3 , the outer surface of the connected round steel does not exceed the surface of the inner wall of the pile foundation hole. mm hot-dip galvanized round steel), the upper end is welded to the connection ring 1 located at the hole of the pile foundation, the middle part of the connected round steel is welded to the horizontal grounding body (welding point 5), and the lower end of the connected round steel extends to the bottom of the pile foundation hole. And connected with the longitudinal grounding body 6 by welding; insert or screw in four longitudinal grounding bodies at the bottom of the pile foundation hole (use 50*50*5 type angle steel, or use Φ50 type spiral anchor pile, the length is 0.5 meters, the front end made into a 30 degree sharp angle). Finally, the round bar (or flat steel) arranged horizontally is connected to the grounding down conductor 11 by welding, and the grounding down conductor is connected to the grounding flat iron 12 by welding. A three-dimensional grounding grid can be formed. The steel skeleton has a main steel skeleton distributed vertically at intervals and an auxiliary steel skeleton distributed in a ring shape, and the main steel skeleton is tied to the auxiliary steel skeleton; finally, the main steel skeleton 7 is installed in the pile foundation hole. , Auxiliary steel frame 8 and steel frame composed of anchor bolts 10, then pour concrete 9 in the pile foundation hole, thereby forming the steel pipe rod foundation. And the steel pipe pole (indicated by the dotted line in Fig. 1) is connected with the corner bolt through fastening bolts, thereby completing the erection of the steel pipe pole.

Claims (3)

1. the grounded screen that a kind of utilization steel pipe pole pile foundation is set up, is characterized in that：It is vertically arranged in pile foundation hole including interval（2）Wall Interior connection round steel（3）, it is described to connect round steel upper end and be connected annulus（1）It is weldingly connected, lower end extends to pile foundation hole bottom, institute If stating be arranged at intervals with the hole wall of pile foundation hole the horizontal grounding body of dried layer（4）, per layer of horizontal grounding body interval setting, it is described laterally The inwall of pile foundation hole is stretched in grounding body one end, and the other end is weldingly connected with round steel is connected, and connection round steel outer surface is without departing from pile foundation Hole wall surface, the connection round steel lower end and longitudinal grounding body（6）One end is weldingly connected, and longitudinal grounding body other end stretches to stake In datum hole bottom, the connection annulus passes through down conductor（11）With ground connection band iron（12）It is weldingly connected.

2. the grounded screen that a kind of utilization steel pipe pole pile foundation according to claim 1 is set up, is characterized in that：The connection round steel Outer surface is with pile foundation hole inner wall surface at a distance of not less than 1 centimetre.

3. the grounded screen that a kind of utilization steel pipe pole pile foundation according to claim 1 is set up, is characterized in that：The horizontal ground connection Body（4）With longitudinal grounding body（6）Length is 0.5 meter, and the angle steel using 50*50*5 type specifications or using the type spiral shells of Φ 50 Rotation anchorage stake is made.