JPH07302630A - Structure for earth electrode and its construction method - Google Patents

Abstract

PURPOSE:To carry out safe and easy construction work with enhanced workability and securely form an earth electrode by injecting high pressure water from a fluid injection unit through the electrode while controlling the pressure water to be fed from a high pressure pump. CONSTITUTION:An earth electrode A comprises an electrode 1, a fluid injection unit 2 disposed at the tip of the electrode 1, and a lead wire unit 3 to be connected to the rear end of the electrode 1. In this earth electrode A such constituted as above, high pressure water having a desired pressure is started to be fed by a trigger of a high pressure water feeding control tool B, so as to reach up to a nozzle 2c through a passage inside the electrode 1, thereby achieving a function of injecting the water through a fluid injecting opening 2b formed on a tip cover 2a. The connection between a nipple 1d and electrode materials 1a, 1b is carried out by adopting a connection means for adjusting a length of the earth electrode. In the case where a depth degree higher than a predetermined disposition depth is required or where a preset resistance value at a depth smaller than the predetermined disposition depth is obtained, it is possible to easily cope with the situations.

Description

Detailed Description of the Invention

[0001]

The present invention relates to gas / water pipes, electricity /
In an urban area where underground buried objects such as telephone cables are present, the location of the buried objects can be accurately detected, and an earth electrode that can be efficiently installed in the ground without damaging the buried objects. It relates to the structure and its construction method.

[0002]

2. Description of the Related Art In an urban area where there are underground buried objects such as gas / water pipes and various cables, for example, when a ground electrode for equipment for distribution lines is installed in the ground, it is commonly used. Due to the high risk of damaging buried objects during construction, there is a danger zone (range 1.2 m from the ground surface).
Underground objects are regulated to be buried within this depth. ) Has been carefully drilled, and then the method of driving the ground electrode through the drilled hole has been adopted.

A conventional example of this kind is shown in FIGS. 3 and 4. First, referring to FIG. 3,
Underground exploration radar (a) scans the surface of the earth (see Figure (a)) to detect the existence of underground buried objects, and when no buried objects exist, the pavement layer (h) of the required area is cut off by the core cutter. Drill a slightly larger hole (d) using a double shovel (b). The depth of the hole (d) must exceed the standard for electrical equipment construction. Next, a predetermined earth installation hole is to be drilled. A rod-shaped metal probe (c) is inserted at the bottom of the hole (d), and a buried object is searched within a radius of about 10 cm before drilling. Aluminum tube (3 ') with small diameter hole (e) of desired depth and punching (4') by repeating pulling work after driving the rope about 10 cm.
The copper earth (1 ') to which the lead wire (2') is connected is inserted into the above, and then the aluminum tube (3 ') is inserted into the small diameter hole (e). After that, after confirming a desired resistance value with a measuring device, a ground resistance reducing agent is put into the voids and solidified, the pavement layer is restored, and the installation work is completed.

Next, another conventional example will be described with reference to FIG. 4. The pavement layer (h) on the ground surface cuts off a large area that facilitates the excavation work of the operator, and the buried object is spread over a large area. After excavating with a shovel while sensuously exploring and digging a hole of intermediate depth, form a hole using the exploration steel rod (g) as in the above-mentioned example, and insert the ground electrode into this hole. It will be installed.

[0005]

Problems of the Prior Art Since the excavation hole has a depth of 1.2 m or more and the tip of the shovel must be carefully worked so as not to damage the buried object, a relatively large hole is excavated. Become. Therefore, it requires complex work such as peeling pavement → hole excavation → driving earth electrode → backfilling excavation residual soil → pavement restoration, which is inefficient and costly. However, there is a risk that it will be impossible to detect when there is a buried object at a depth of 1.2 m or more, and grounding work may damage the buried object.

[0006]

[Means for Solving Problems] In the prior art,
Extensive and careful excavation was essential to prevent the tip of the excavator from damaging the buried objects, which significantly reduced efficiency. Further, it is difficult to say that the driving of the earth electrode after the hole excavation can maintain 100% safety, and there are many problems in installing the earth electrode in the urban area where there are extremely many underground buried objects. It was a thing.

The present invention proposed in view of these various problems is an earth electrode composed of an electrode provided with a high-pressure water feed controller, a fluid ejecting portion, and a lead wire portion, and such an earth electrode. This is a construction method in which the electrode itself is used directly for underground exploration while it is used for exploration.

[0008]

The earth electrode controls the high-pressure water supplied from the high-pressure pump through the high-pressure water feed controller connected to the rear end, passes through the electrode, and is ejected from the fluid ejecting section. Even if the soil is collapsed by high-pressure water to form a hole, the soil will be rushed and face the buried object, it will not be damaged due to the nature of the water.

Further, the earth electrode itself is used as a means for circulating high-pressure water, and the construction method has a step of disconnecting the high-pressure water feed control device at a predetermined depth position, which is highly safe in operation. The diameter of the installation hole is also small, and the work 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 section (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) is connected at its rear end to a high pressure water feed control section (B) for controlling the flow of high pressure water, and at the front end thereof with an O-ring (1f) interposed, an electrode material (1a). ) Connected to the lead cap (1c) and the other end of the electrode material (1a) via the O-ring (1f) and the nipple (1d), the electrode material (1b) and the electrode material (1b). It is formed of a tip nipple (1e) that connects the fluid ejecting portion (2) to the other end, and is entirely made of copper.

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

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

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

In the ground electrode (A) thus constructed, high-pressure water having a desired pressure is started to be fed by the trigger of the high-pressure water feed controller (B), and the flow path in the electrode (1) is started. Through the nozzle (2c) to the tip cover (2
It is possible to achieve the action of ejecting from the fluid ejection opening (2b) of a). When the nipple (1d) and the electrode materials (1a) and (1b) are coupled to each other by using a connecting means capable of adjusting the length of the ground electrode, when a depth greater than or equal to a predetermined installation depth is required or below the predetermined installation depth. It is possible to easily cope with a case where a predetermined resistance value is obtained in.

Next, installation and 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 is a high-pressure pump (D) operated by a drive source, a hose (C) for feeding high-pressure water, and a ground electrode (A) for spraying high-pressure water from the tip and having a grounding function. ), A high-pressure water feed controller (B) capable of controlling the feed of high-pressure water while locating and holding the tip of the ground electrode (A) at a predetermined position on the ground surface, and a handle freely connectable as necessary There is a vacuum, etc. that treats high-pressure water discharged on the surface and on the surface.

Now, after the high-pressure pump (D) is driven to increase the water pressure, the high-pressure water feed controller (B) connected to the hose (C) for supplying the high-pressure water is gripped, and the earth electrode (A) is held. )
The fluid ejecting opening (2b) of (1) is directed to a predetermined ground surface location, and the trigger (B ') of the high-pressure water feed control tool (B) is operated.

The high-pressure water is strongly jetted from the fluid jet opening (2b) at the tip of the earth electrode (A) and continues to collapse the earth and sand on the surface of the earth electrode (A). The soil and sand that are produced are discharged to the surface. The discharged high-pressure water is processed by vacuum.

Excavation is carried out by the ground electrode (A) itself, and when the desired depth is reached, the feed is stopped by the trigger (B '), the resistance value is measured by a measuring instrument, and the excavation is carried out until the resistance value falls below a predetermined value. When a deeper depth is required, the electrode materials (1a) (1b) and the nipple (1d) may be replenished.

After the predetermined resistance value is obtained, the high-pressure water feed control tool (B) is cut off while the ground electrode (A) is still in the ground, and the ground electrode (A) is placed in the space around the ground electrode (A). Finish the installation by returning the soil or adding a ground resistance reducing agent to solidify.

A strong pressing force is required when the soil on which the earth electrode is to be installed is a sandy soil layer, but a handle portion that can obtain a strong gripping force for such installation work on the soil layer. (E) is interposed between the ground electrode (A) and the high-pressure water feed controller (B).

When the tip of the ground electrode (A) faces an underground buried object, the pressing force on the ground electrode (A) becomes extremely large, so that it is extremely easy to detect the underground buried object, and water pressure is used. Therefore, damage to the underground buried object does not occur at all.

[0023]

As described above, according to the present invention, safe and simple work can be carried out especially in an urban area where many kinds of underground buried objects exist and the work range is limited.
Not only the workability can be improved, but also the reliable construction of the ground electrode can be performed, and the cost can be greatly reduced.

[Brief description of drawings]

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

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

FIG. 3 shows a state-of-the-art urban earth installation method in which various devices for exploring underground buried objects (a) and (c) and hole excavation are performed in many steps.

[Fig. 4] Fig. 4 shows a conventional ground installation method, which adopts a stepping method.

[Explanation of symbols]

 A ... Ground electrode B ... Handle part B '... Trigger C ... Hose for feeding high-pressure water D ... High-pressure pump E ... Handle part 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 ... Injection 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 ro… Double excavator ha… Bar-shaped metal explorer d… Large-diameter hole e… Small-diameter hole f… tiered hole d… exploration steel bar chi… pavement layer

Claims (3)

[Claims] 1. An electrode material (1a) is provided at each of a front end and a rear end.
(1e) and an electrode (1) consisting of a lead cap (1c) connecting the high-pressure water feed control tool (B), electrode materials (1a) (1b), nipples (1d) (1e), and high-pressure water jetting The lead cap (1c) in the electrode (1) is formed by a fluid ejecting portion (2) including a tip cover (2a) having an opening (2b) and a nozzle (2c) and a lead wire portion (3). The lead wire portion (3) is joined and the fluid jet portion (2) is joined through the nipples (1d) (1e), and the high-pressure water jet from the fluid jet portion (2) from the rear end of the lead cap (1c). An earth electrode, characterized in that high-pressure water is conducted to the opening (2b). 2. The lead wire portion (3) comprises a lead wire (3a) and a crimp tube (3b), and the lead wire (3a) is crimped and connected to the outer circumference of the lead cap (1c) by the crimp tube (3b). The ground electrode according to claim 1, wherein the ground electrode is formed. 3. A high-pressure water feed control tool () for a rear end portion of an electrode (1) in an earth electrode (A) in which a lead wire portion (3) and a fluid ejecting portion (2) are connected to the electrode (1). B) is directly or indirectly connected through the handle portion (E), and first, the high-pressure water feed controller (B) or the handle portion (E) is gripped to set the fluid ejecting portion (2) to a predetermined size. The high-pressure water feed controller (B) is activated by aligning it with the grounding point of (1), and the high-pressure water is jetted from the fluid jetting section (2) to detect the buried object in the ground and allow the earth electrode (A) to enter. At the same time, the collapsed earth and sand are discharged by high-pressure water through the void formed around the earth electrode (A), and after the earth electrode (A) reaches a desired depth, the high-pressure water feed control tool (B), etc. A method for constructing a ground electrode, which is cut off and soil or a ground resistance reducing agent is put into the void. .