JP2893570B2 - Structure of earth electrode and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to gas / water pipes,
A ground electrode that can accurately detect the location of the above-mentioned underground objects in an urban area where underground objects such as telephone cables exist, and can be installed underground efficiently without damaging those underground objects. It relates to the structure and its construction method.

[0002]

2. Description of the Related Art In an urban area where underground objects such as gas / water pipes and various cables are present, for example, when an earth electrode for distribution line equipment is installed underground, a driving method which is generally used frequently is used. Construction has a high risk of damaging underground objects, so the danger zone (1.2 m from the surface of the ground).
Underground buried objects are regulated to be buried within this depth. ) Is carefully excavated, and then a ground electrode is driven into the excavated hole.

FIGS. 3 and 4 show a conventional example of this type. First, referring to FIG.
The underground exploration radar (a) scans on the surface of the ground (see Figure (a)) to search for the existence of underground buried objects. Use a double shovel (b) to drill a slightly larger diameter hole (d). It is necessary that the depth of the hole (d) exceeds the standard for electrical installation work. Next, a predetermined ground installation hole is excavated. A rod-shaped metal detector (c) is inserted into the bottom of the hole (d) to search for a buried object within a radius of about 10 cm. The operation of pulling out the steel rod about 10 cm is repeated to form a small diameter hole (e) having a desired depth, and the lead wire (2 ') is connected to the aluminum tube (3') formed with the perforation (4 '). Copper ground (1 ')
Then, the aluminum tube (3 ') is inserted into the small-diameter hole (e). After confirming the desired resistance value with a measuring instrument, the ground resistance reducing material is injected into the created space and solidified, the pavement layer is restored, and the installation operation is completed.

[0004] Next, another conventional example will be described with reference to FIG. 4. A pavement layer (h) on the ground surface is cut off a large area to facilitate digging work by an operator, and buried objects are spread over a wide area. After excavating with a shovel and digging a hole at an intermediate depth while exploring intuitively, a hole is formed using an exploration steel rod (g) in the same manner as in the above-mentioned example, and an earth electrode is inserted into this hole. It is installed.

[0005]

2. Description of the Related Art Excavation holes have a depth of 1.2 m or more, and the excavator must be carefully operated so as not to damage the buried object. Become. Therefore, complex work such as peeling off the pavement → excavating the hole → driving in the ground electrode → backfilling the excavated soil, etc. → restoring the pavement is inefficient and costly, and driving the ground electrode into the hole There is a danger that the work will be carried out, or when a buried object is exceptionally present at a depth of 1.2 m or more, it is impossible to detect the buried object, and there is a risk that the grounding work may be damaged.

[0006]

[Means for Solving the Problems] In the prior art,
Excessive and careful excavation was essential to prevent the excavator tip from damaging the underground object, thereby significantly reducing efficiency. Also, it is difficult to say that the driving of the ground electrode performed after the excavation can have 100% safety, and there are many problems when installing the ground electrode in an urban area where there are extremely many underground buried objects. Was something.

The present invention proposed in view of these problems is an earth electrode composed of an electrode provided with a high-pressure water supply control device, a fluid ejecting section, and a lead wire section. This is a construction method in which electrodes are directly installed in the ground while using the electrodes themselves for exploring underground objects.

[0008]

The earth electrode controls the high-pressure water supplied from the high-pressure pump via the high-pressure water supply control device connected to the rear end, and passes through the inside of the electrode to be ejected from the fluid ejection section. The soil is collapsed by the high-pressure water to penetrate while forming a hole, and even if a buried object is encountered, the buried object is not damaged due to the nature of the water.

[0009] Further, the construction method employs the earth electrode itself as a means for distributing high-pressure water and has a step of disconnecting the high-pressure water supply control device at a predetermined depth position. Also, the diameter of the installation hole is small, so that the working process can be greatly reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an earth electrode (A) having a structure capable of exploring an underground buried object, which is connected to an electrode (1), a fluid ejecting part (2) provided at the tip of the electrode (1), and a rear end of the electrode (1). And a lead wire portion (3).

The electrode (1) has a rear end connected to a high-pressure water supply control section (B) for controlling the flow of high-pressure water, and a front end interposed with an O-ring (1f) for an electrode material (1a). ) Is connected to the lead material (1c) and the other end of the electrode material (1a) via an O-ring (1f) and a nipple (1d). The other end is formed of a tip nipple (1e) connecting the fluid ejecting section (2), and is entirely made of copper.

The fluid ejection section (2) is formed of a carbon steel tip cover (2a) having a fluid ejection opening (2b) at the tip and a stainless steel nozzle (2c).
The tip nipple (1e) is connected to include the nozzle (2c).

The lead wire portion (3) is a crimp tube (3) for crimping the lead wire (3a) and the end of the lead wire (3a) to the outer periphery of the lead cap (1c) of the electrode (1).
b).

The electrode members (1a) and (1b) are tubular, and are of various lengths so that they can be changed according to the installation depth of the earth electrode (A).

In the earth electrode (A) configured as described above, high-pressure water having a desired pressure is started to be supplied by a trigger of the high-pressure water supply control tool (B) and the flow path in the electrode (1) is started. Through the nozzle (2c) to reach the tip cover (2
The function of injecting from the fluid ejection opening (2b) of a) can be achieved. Since the connection between the nipple (1d) and the electrode materials (1a) (1b) employs a connecting means capable of adjusting the length of the ground electrode, when a depth greater than a predetermined installation depth is required or less than a predetermined installation depth. Can easily cope with the case where a predetermined resistance value is obtained.

Next, installation of the ground electrode (A) will be described with reference to FIGS. 2 (a) and 2 (b). The equipment required for the installation work includes a high-pressure pump (D) operated by a drive source, a hose (C) for supplying high-pressure water, and a ground electrode (A) which jets high-pressure water from the tip and has an earth function. ), A high-pressure water feed control tool (B) that can hold the tip of the earth electrode (A) at a predetermined location on the ground surface and control the feed of high-pressure water, and a handle that can be freely connected as necessary. There is a vacuum or the like for treating high-pressure water discharged on the ground and the surface.

Now, after the high-pressure pump (D) is driven and the water pressure increases, the high-pressure water supply control tool (B) connected to the hose (C) for supplying the high-pressure water is gripped and the ground electrode (A) is held. )
The trigger (B ') of the high-pressure water supply control tool (B) is operated with the fluid ejection opening (2b) of the high-pressure water supply controller (B) being directed to a predetermined ground surface location.

The high-pressure water is strongly ejected from the fluid ejection opening (2b) at the tip of the earth electrode (A), and continuously collapses the earth and sand on the surface of the earth, and collapses one after another through the voids formed on the outer periphery of the earth electrode (A). Both soil and soil are released to the surface. The discharged high-pressure water is treated by vacuum.

Excavation is performed by the ground electrode (A) itself, and when reaching a desired depth, feeding is stopped by the trigger (B '), and the resistance value is measured by a measuring instrument, and excavation is performed until the resistance value becomes equal to or less than a predetermined resistance value. When a deeper depth is required, the electrode material (1a) (1b) and the nipple (1d) may be added.

After the predetermined resistance value is obtained, the high-pressure water supply control tool (B) is cut off while the earth electrode (A) is in the ground, and the space is formed in the outer periphery of the earth electrode (A). Return the soil or add a grounding resistance reducing agent and solidify to complete the installation.

When the soil on which the earth electrode is to be installed is a sandy soil layer, a stronger pressing force is required. However, such an installation work on the soil layer requires a handle portion capable of obtaining a strong gripping force. (E) is interposed between the earth electrode (A) and the high-pressure water feeding control tool (B).

When the tip of the earth electrode (A) faces an underground object, the pressing force on the earth electrode (A) becomes extremely large, so that it is extremely easy to detect the underground object, and water pressure is used. Therefore, no damage to the underground buried object occurs.

[0023]

As described above, according to the present invention, safe and simple work can be performed particularly in urban areas where many types of underground buried objects exist and the work range is limited.
This not only improves the workability but also enables the reliable installation of the ground electrode, thereby achieving a significant cost reduction.

[Brief description of the drawings]

FIG. 1 shows a ground electrode (A) in which a fluid ejecting section (2) is connected to the tip of an electrode (1).

FIG. 2 shows a high-pressure water supplied from a high-pressure pump (D) to a ground electrode (A) via a hose (C), a high-pressure water feeder (B), and a handle portion (E). Jet from
The state in which the ground electrode (A) itself is installed in the ground (FIG. (A)), the high-pressure water feeder (B), and the handle (E)
Are integrated (FIG. (B)).

FIG. 3 shows various equipments (a) and (c) for exploring an underground buried object and a state in which hole excavation is performed in many steps by a conventional urban ground installation method.

FIG. 4 shows a conventional earth installation method employing a stepping method.

[Explanation of symbols]

 A: ground electrode B: handle portion B ': trigger C: hose for feeding high-pressure water D: high-pressure pump E: handle portion 1: electrode 1a, 1b: electrode material 1c: lead cap 1d: nipple 1e: tip nipple 1f ... Ring 1 '... Copper ground 2 ... Fluid ejection part 2a ... Tip cover 2b ... Ejection opening 2c ... Nozzle 2' ... Lead wire 3 ... Lead wire part 3a ... Lead wire 3b ... Crimping tube 3 '... Aluminum tube 4' ... Drilling A ... Underground exploration radar B ... Double shovel C ... Bar-shaped metal detector D ... Large diameter hole E ... Small diameter hole F ... Hole by step drilling G ... Exploration steel rod H ... Paving layer

Continuation of the front page (56) References JP-A-55-66875 (JP, A) JP-A-4-60092 (JP, A) JP-A-55-9303 (JP, A) JP-A-54-9743 (JP, A) , A) Fully open sho 53-2629 (JP, U) Full open sho 63-1335769 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01R 4/66 H01R 43/00

Claims (2)

(57) [Claims] An electrode material (1a) is provided at each of a front end and a rear end.
(1b) and the high pressure water feed control device (B) the electrode member to the lead cap (1c) connecting the (1a) (1b) and the nipple (1d) (1e) and consisting electrode (1), a predetermined
A fluid ejecting part (2) comprising a tip cover (2a) having a high pressure water jet opening (2b) at the tip and a nozzle (2c) for jetting high pressure water toward the ground surface, and a lead wire (3).
a) a crimp tube (3b) from the configured lead portion (3) is the de formation, the nipple with coupling said lead wire section (3) to a lead cap (1c) in the electrode (1) ( 1d) through (1e) coupling said fluid injection unit (2), wherein the high pressure water injection opening leads cap (the fluid injection unit from the rear end of 1c) (2) (2
(b) a ground electrode configured to conduct high-pressure water to the ground electrode; 2. An electrode (1) and a lead wire (3a) and a crimp tube.
(3b) and a predetermined lead wire portion (3)
Open high-pressure water at the tip to inject high-pressure water toward the top
Tip cover (2a) formed with mouth (2b) and nozzle
Fluid injection unit consisting of (2c) (2) and high-pressure water feeding control element to the rear end portion of the electrode (1) in the ground electrode coupled (A) (B) directly or handle portion (E) leave connected indirectly via a first grips the high pressure water feed control device of the (B) or the handle portion (E) aligning and the fluid injection unit (2) to a predetermined ground point the pressure water feed control element (B) at the same time disintegrating sediment when allowed to enter the grounding electrode (a) while detect underground product allowed jetting high-pressure water from the fluid injection unit (2) by activating the was discharged by high-pressure water through a gap formed around the grounding electrode (a), said ground electrode (a) is the high pressure water feeding control tool after reaching a desired depth the (B) or the like the cleavage, ground, characterized in placing the soil or ground resistance reducing material in the gap Construction method of the pole.