Anti-inclination construction method for 10-kilovolt distribution line pole in paddy field

Abstract

The invention discloses an anti-inclination construction method for a 10-kilovolt distribution line electric pole in a paddy field, and belongs to the technical field of 10-kilovolt distribution line construction. The problems that a cement electric pole installed in a paddy field is prone to inclination, pole falling is prone to occurring due to the too large inclination amplitude, and low-discharge grounding is caused are solved. According to the method, the installation position of the electric pole is positioned, a rotary drilling machine drill rod is used for being matched with a conventional drill rod for drilling on an original soil layer, and an initial hole is formed; replacing a rotary drilling machine drilling rod with a rotary drilling machine expanding drilling rod, and expanding the middle part of the initial hole to form an expanding section; drilling a concrete injection hole in the original soil layer, and enabling the concrete injection hole to be communicated with the expanding section; the electric pole is hoisted into the initial hole, and after the perpendicularity is adjusted, the space between the electric pole and the hole wall is filled with medium sand to fix the electric pole; and concrete is injected into the expanding section through the concrete injection hole, and the concrete is vibrated and compacted by using a variable-frequency vibrating rod. The lateral force resistance of the electric pole is improved, and the electric pole is prevented from inclining due to seasonal water injection in the rice field.

Description

Technical Field

[0001] The invention belongs to the technical field of the construction of 10 kV distribution lines, and particularly relates to a construction method for preventing the inclination of poles of 10 kV distribution lines in paddy fields. Background Art

[0002] The 10 kV distribution system is the end high-voltage power supply system of the power system. The operation and maintenance status of 10 kV distribution lines directly affects the power supply reliability. Most of the 10 kV distribution lines use cement poles as the main poles, shuttling through every corner of the entire 10 kV distribution network. Among them, the inclination problem of the poles of 10 kV distribution lines has always troubled the construction and development of power transmission and transformation projects. The cement poles installed in paddy fields are prone to inclination due to the seasonal water injection in paddy fields, which causes local geological conditions to change, directly affecting the power supply reliability of the lines. If the inclination of the poles is too large, it will also cause phenomena such as pole collapse and ground discharge and grounding. Although the prior art has tried to increase the drilling depth or expand the hole diameter, no systematic solution has been designed for the special geology of paddy fields. How to solve the problem of the inclination of cement poles of 10 kV distribution lines in paddy fields requires treatment from the source, and it is very necessary to find good construction methods and measures from the source.

[0003] Therefore, this application proposes a construction method for preventing the inclination of poles of 10 kV distribution lines in paddy fields to solve the above problems. Summary of the Invention

[0004] The research and development purpose of the invention is to solve the problems that the cement poles installed in paddy fields are prone to inclination, and if the inclination amplitude is too large, pole collapse, low-voltage discharge and grounding and other problems are likely to occur. The following gives a brief overview of the invention to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive overview of the invention. It is not intended to identify the key or important parts of the invention, nor is it intended to limit the scope of the invention.

[0005] The technical solution of the invention:

[0006] A construction method for preventing the inclination of poles of 10 kV distribution lines in paddy fields includes the following steps:

[0007] Step 1: Locate the installation position of the pole, and use the drill rod of the rotary drilling rig equipped with a conventional drill rod to drill holes on the original soil layer to form initial holes;

[0008] Step 2: Replace the drill rod of the rotary drilling rig with an expanded-diameter drill rod of the rotary drilling rig, and expand the hole in the middle of the initial hole to form an expanded-diameter section;

[0009] Step 3: Drill concrete injection holes on the original soil layer to connect the concrete injection holes with the expanded-diameter section;

[0010] Step 4: Hoist the pole into the initial hole. After adjusting the verticality, fill medium sand between the pole and the hole wall to fix the pole.

[0011] Step 5: Inject concrete into the enlarged diameter section through the concrete injection hole, and use a variable frequency vibrating rod to vibrate the concrete until it is dense.

[0012] Further, in Step 2, the diameter of the enlarged diameter section is 1.5 to 2 times the diameter of the initial hole, and the height of the enlarged diameter section is 1 / 3 to 1 / 2 of the buried depth of the pole.

[0013] Further, the concrete in Step 5 is fine pebble C20 concrete, and the mixing ratio of the fine pebble C20 concrete is cement: fine pebble: sand = 1: 2: 3, and the water-cement ratio is 0.45 to 0.5.

[0014] Further, the vibration frequency of the variable frequency vibrating rod in Step 5 is 8,000 to 12,000 times / minute, and the vibration time is 3 to 5 minutes.

[0015] Further, after filling medium sand between the pole and the hole wall in Step 4, the surface is covered with a waterproof layer.

[0016] Further, the rotary drilling rig's enlarged diameter drill rod includes an upper rod, a lower rod, and a chassis. The upper end of the upper rod is connected to the rotary drilling rig, the bottom of the lower rod is connected to the chassis, the bottom of the upper rod is hinged with a first connecting rod, the top of the lower rod is hinged with a second connecting rod, the first connecting rod, the second connecting rod, and the enlarged diameter drill bit are connected by a shaft, a cross seat is arranged on the upper end surface of the lower rod, a cross hole is machined at the corresponding position at the bottom of the upper rod, and the cross seat and the cross hole are fitted and installed.

[0017] Further, a plurality of position sensors are longitudinally and evenly distributed on the cross seat.

[0018] Further, a return spring is installed on the connecting shaft of the first connecting rod, the second connecting rod, and the enlarged diameter drill bit.

[0019] The present invention has the following beneficial effects:

[0020] 1. For a construction method for preventing the inclination of a 10 kV distribution line pole in a paddy field according to the present invention, during the hole drilling process, an enlarged diameter section is processed in the initial hole by the rotary drilling rig's enlarged diameter drill rod. When the pole is installed, concrete is injected into the enlarged diameter section to form an anchoring effect on the pole, so that the lateral force resistance of the pole is increased by more than 40%, preventing the pole from tilting due to seasonal water injection in the paddy field and improving the stability of the pole in the paddy field.

[0021] 2. The construction method for preventing the inclination of a 10 kV distribution line pole in a paddy field according to the present invention improves the construction efficiency of the pole by 30% and is applicable to large-scale field operations. Description of the Drawings

[0022] Figure 1 It is a schematic installation diagram of a utility pole;

[0023] Figure 2 It is a schematic diagram of the drill pipe of a rotary drilling rig;

[0024] Figure 3 It is a schematic diagram of the conventional state of the diameter-expanded drill pipe of a rotary drilling rig;

[0025] Figure 4 It is a schematic diagram of the working state of the diameter-expanded drill pipe of a rotary drilling rig;

[0026] Figure 5 It is Figure 3 a partial schematic diagram of;

[0027] Figure 6 It is Figure 4 a partial schematic diagram of.

[0028] In the figure: 1 - drill pipe of a rotary drilling rig, 2 - diameter-expanded drill pipe of a rotary drilling rig, 3 - original soil layer, 4 - utility pole, 5 - concrete, 6 - concrete injection hole, 7 - cross hole, 8 - cross base, 9 - position sensor, 10 - return spring, 21 - upper rod, 22 - lower rod, 23 - chassis, 24 - diameter-expanding drill bit, 25 - first connecting rod, 26 - second connecting rod. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0030] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connections (i.e., non-detachable connections) include, but are not limited to, conventional fixed connection methods such as hemming connections, rivet connections, bonding connections, and welding connections. The detachable connections include, but are not limited to, conventional disassembly methods such as screw connections, snap connections, pin connections, and hinge connections. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can always be found among the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0031] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1, in combination with Figures 1-6 To illustrate this example, a method for preventing the tilt of a 10-kV distribution line pole in a paddy field in this example includes the following steps:

[0033] Step 1: Locate the installation position of the pole 4, and use the drill rod 1 of the rotary drilling rig equipped with a conventional drill rod to drill a hole in the original soil layer 3 to form an initial hole.

[0034] Step 2: Replace the drill rod 1 of the rotary drilling rig with the reaming drill rod 2 of the rotary drilling rig, and ream the middle part of the initial hole to form a reamed section.

[0035] Step 3: Drill a concrete injection hole 6 in the original soil layer 3 to connect the concrete injection hole 6 with the reamed section.

[0036] Step 4: Lift and install the pole 4 into the initial hole. After adjusting the verticality, fill medium sand between the pole 4 and the hole wall to fix the pole 4.

[0037] Step 5: Inject concrete 5 into the reamed section through the concrete injection hole 6, and use a variable-frequency vibrating rod to vibrate the concrete 5 until it is dense.

[0038] After locating the installation position of the utility pole 4, use the rotary drilling rig drill pipe 1 to drill an initial hole with a diameter of 0.6 m and a depth of 3 m. Subsequently, replace the rotary drilling rig diameter-expanding drill pipe 2 and insert it to a depth of 1.5 m in the initial hole. The chassis 23 of the rotary drilling rig diameter-expanding drill pipe 2 abuts against the bottom of the initial hole. Continuously press down the upper rod 21. The upper rod 21 moves downward, causing the first connecting rod 25 and the second connecting rod 26 between the upper rod 21 and the lower rod 22 to expand outward, driving the diameter-expanding drill bit 24 to expand outward. At the same time, the cross seat 8 on the lower rod 22 is inserted into the cross hole 7 of the upper rod 21. The rotary drilling rig continuously drives the rotary drilling rig diameter-expanding drill pipe 24 to rotate, forming a diameter-expanded section. The diameter of the diameter-expanded section is 1.5 to 2 times the diameter of the initial hole. Four position sensors 9 are longitudinally and evenly distributed from top to bottom on the cross seat 8. The position sensor 9 is an LK-G5000 sensor. According to the signals transmitted by the position sensors 9, understand the depth of the cross seat 8 inserted into the cross hole 7, so as to obtain the width of the two symmetrically arranged diameter-expanding drill bits 24 and control the diameter of the diameter-expanded section. At the same time, with the cooperative installation of the cross seat 8 and the cross hole 7, ensure that when the rotary drilling rig drives the upper rod 21 to rotate, it can drive the lower rod 22 to rotate simultaneously without axial self-rotation.

[0039] In this embodiment, the diameter of the diameter-expanded section is designed to be 2 times the diameter of the initial hole, and the diameter of the diameter-expanded section is 1.2 m. After digging the diameter-expanded section with the rotary drilling rig diameter-expanding drill pipe 2, the rotary drilling rig rises upward to drive the upper rod 21 to move upward. A return spring 10 is installed on the shaft connecting the first connecting rod 25, the diameter-expanding drill bit 24, and the second connecting rod 26. Under the action of the return spring 10, ensure the reset of the diameter-expanding drill bit 24 when the upper rod 21 moves upward. After resetting, take it out from the original soil layer 3 to complete the construction of the initial hole and the diameter-expanded section. Use a crane to hoist the utility pole 4 into the initial hole. After adjusting the verticality, fill medium sand between the utility pole 4 and the hole wall to fix the utility pole 4, and coat an asphalt waterproof layer on the surface to reduce the loss of medium sand and reduce the inclination rate of the utility pole 4 to less than 1%.

[0040] Subsequently, select a position on the original soil layer 3 to process a concrete injection hole 6. The concrete injection hole 6 is constructed by supporting a thin drill pipe with a small rotary drilling equipment. The position of the concrete injection hole 6 is above the diameter-expanded section. After the concrete injection hole 6 is drilled through, it is connected to the diameter-expanded section. Pour the prepared fine pebble C20 concrete into the diameter-expanded section through the concrete injection hole 6. The mixing ratio of the fine pebble C20 concrete is cement: fine pebble: sand = 1:2:3, and the water-cement ratio is 0.45 - 0.5. Pour the fine pebble C20 concrete through a pressure pump, and the injection pressure is 0.4 Mpa. After pouring the fine pebble C20 concrete, use a variable-frequency vibrating rod with a frequency of 10,000 times per minute and vibrate for 4 minutes to vibrate the concrete in the diameter-expanded section densely to form a rigid support.

[0041] This embodiment is only an exemplary illustration of the present invention and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as they do not exceed the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields, characterized in that: It includes the following steps: Step 1: Locate the installation position of the electric pole (4), and use the rotary drilling rig rod (1) equipped with a conventional drill rod to drill a hole on the original soil layer (3) to form an initial hole; Step 2: Replace the rotary drilling rig rod (1) with a rotary drilling rig diameter-expanding drill rod (2), and expand the hole in the middle of the initial hole to form a diameter-expanded section; Step 3: Drill a concrete injection hole (6) on the original soil layer (3) to make the concrete injection hole (6) communicate with the diameter-expanded section; Step 4: Lift and install the electric pole (4) into the initial hole. After adjusting the verticality, fill medium sand between the electric pole (4) and the hole wall to fix the electric pole (4); Step 5: Inject concrete (5) into the diameter-expanded section through the concrete injection hole (6), and use a variable-frequency vibrating rod to vibrate and compact the concrete (5).

2. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 1, characterized in that: In the second step, the diameter of the diameter-expanded section is 1.5 to 2 times the diameter of the initial hole, and the height of the diameter-expanded section is 1 / 3 to 1 / 2 of the buried depth part of the electric pole (4).

3. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 2, characterized in that: The concrete (5) in the fifth step is fine pebble C20 concrete, and the mixing ratio of the fine pebble C20 concrete is cement: fine pebble: sand = 1: 2: 3, and the water-cement ratio is 0.45 to 0.

5.

4. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 3, characterized in that: The vibration frequency of the variable-frequency vibrating rod in the fifth step is 8000 to 12000 times / minute, and the vibration time is 3 to 5 minutes.

5. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 4, characterized in that: After filling medium sand between the electric pole (4) and the hole wall in the fourth step, the surface is covered with a waterproof layer.

6. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 1 or 5, characterized in that: The rotary drilling rig diameter-expanding drill rod (2) includes an upper rod (21), a lower rod (22) and a chassis (23). The upper end of the upper rod (21) is connected to the rotary drilling rig, the bottom of the lower rod (22) is connected to the chassis (23), a first connecting rod (25) is hinged at the bottom of the upper rod (21), a second connecting rod (26) is hinged at the top of the lower rod (22), the first connecting rod (25), the second connecting rod (26) and the diameter-expanding drill bit (24) are connected by a shaft, a cross seat (8) is arranged on the upper end surface of the lower rod (22), a cross hole (7) is machined at the corresponding position at the bottom of the upper rod (21), and the cross seat (8) and the cross hole (7) are fitted and installed.

7. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 6, characterized in that: A plurality of position sensors (9) are longitudinally arranged on the cross seat (8) evenly.

8. A construction method for preventing the inclination of utility poles in a 10 kV distribution line in paddy fields according to claim 7, characterized in that: A return spring (10) is installed on the connecting shaft of the first connecting rod (25), the second connecting rod (26) and the diameter-expanding drill bit (24).

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