KOREA ELECTRIC POWER CORPORATION (167 Samsung1-dong, Gangnam-gu, Seoul 135-791, KR)
KWON, Sae Won (232-8 Yeontan-ri, Jeungpyung-eup Goesan-gun, Choongchungbuk-do 368-906, KR)
Claims
[1] A mechanized construction method for round earth wire under-bracing using a backhoe, comprising the steps of: moving a backhoe having an excavation bucket mounted thereon, the excavation bucket having a width suitable for the specification of round earth wire under- bracing, to a target ground where the round earth wire under-bracing is to be buried; excavating the target ground by the excavation bucket, and forming a vertical excavation section having a vertical surface and a sloped excavation section having a sloped surface formed toward a utility pole; and mounting the round earth wire under-bracing on the bottom surface of the vertical excavation section, with an angle between the earth wire rod and the round earth wire under-bracing formed at 90°(tolerance: ±5°) being controlled by a guide rope, positioning the earth wire rod at a sloped state along the sloped excavation section, exposing the front end thereof to the ground surface, and burying the round earth wire under-bracing and the earth wire rod in the target ground by refilling the excavation site. |
Description
MECHANIZED CONSTRUCTION METHOD OF EARTH WIRE UNDER-BRACING USING BACKHOE
Technical Field
[1] The present invention relates to a mechanized construction method for earth wire under-bracing for supporting and fixing a utility pole in case of a utility pole work, and more particularly, to a mechanized construction method for earth wire under-bracing using a backhoe, in which a round under-bracing instead of a conventional rectangular under-bracing can be used for construction by forming a vertical excavation section and a sloped excavation section on a target ground for burying earth wire under- bracing by using a backhoe, and which can make the operation of equipment easier and accelerate a mechanized construction of earth wire under-bracing by using a generalized backhoe.
[2]
[3]
Background Art
[4] Generally, in the construction of an electrical power transmission and distribution line and a communication line, if a utility pole is installed and a wire and a communication cable are wired, an earth wire for reinforcing an unbalanced tensile force of the wire and the communication cable is installed so as to prevent the utility pole from leaning or falling over. Further, at the time of installation of an earth wire, an excavation work for burying an earth wire under-bracing burial is firstly carried out by using a labor or machine, and then the earth wire under-bracing is buried at an excavation spot so as to be connected to a utility pole.
[5] In order to bury such earth wire under-bracing, an excavation site having a predetermined depth should be secured by labor at a spot where earth wire under-bracing is to be buried. However, in a case where an excavation site is secured by labor, it is problematic in that an unnecessarily excessive excavation site should be formed in order to secure a worker s work space and the soil around the excavation site becomes deactivated, thereby relatively degrading the burial supporting force of the buried earth wire under-bracing at the time of refilling. Moreover, in case of construction by an excavation of a backhoe, an excessive earth and sand is unnecessarily excavated due to a burial work of a conventional rectangular earth wire under-bracing, and the cohesive power of the ground refilled after burial is weakened to make the drawing force of the earth wire weaker. And, the earth and sand excavated at excessively large area causes damage to the environment of and obstruction in traffic, thereby incurring the enmity
of the people.
[6] Further, to compensate for the above problem, there is a method in which a vertical excavation hole is formed by using an auger crane, and then earth wire under-bracing is filled in land and constructed. However, in the conventional mechanized excavation method, an earth wire rod supporting the under-bracing is not at a right angle with the under-bracing. Thus, a tensile force is generated in the earth wire rod, the under- bracing is extracted and raised to thus make the utility pole lean. This may cause the shoddy and fault construction.
[7] The under-bracing used commonly is made of rectangular blocks, and at the time of construction, the under-bracing is buried at an excavation site horizontally with respect to the utility pole. At this time, the most ideal construction method is to fasten the under-bracing and the earth wire rod to the utility pole at a right angle.
[8] However, as described above, the labor work leads to an excessive labor cost and prolongs the construction hours, and the mechanized excavation causes the shoddy and fault construction and weakens the burial supporting force of the under-bracing.
[9] Furthermore, as described above, there is a difficulty of having to perform an excavation work of a lot of sites in order to bury under-bracing of a rectangular block shape.
[10] Accordingly, Korean Patent Application No. 2005-095892 filed by the applicant of the present invention discloses a mechanized construction method for earth wire under- bracing for a wire work, in which an excavation process is performed in such a manner that a first sloped excavation is carried out by an auger crane, or a first sloped excavation and a second vertical excavation are carried out by stages according to the type of soil, then earth wire under-bracing having an optimum size is inserted and buried in an excavation hole, and then an earth wire rod connected to the earth wire under-bracing is connected and fixed to a vertically raised utility pole.
[11] According to the mechanized construction method for earth wire under-bracing for a utility pole work and a round earth wire under-bracing applied thereto which are disclosed in the aforementioned patent application, the simplification of an excavation process can lead to a reduction in the number of workers and a decrease in working hours, and the right angle state between the earth wire rod and the earth wire under- bracing is stably maintained, thereby sharply increasing the supporting force and overcoming the problems, such as leaning of the utility pole and the shoddy and fault construction. Further, the working environment is improved, and prevents the incurrence of the enmity of the people against the inconvenience in traffic, the construction quality is improved because it offers an excellent facility protection effect from natural disasters by a firm supporting force, thereby smoothly and stably supplying a high quality power.
[12] The earth wire under-bracing applied to the method disclosed in the aforementioned patent application is a round block when viewed from a plane, and there are two types of earth wire under-bracing having a diameter of 43D (hereinafter, referred to as a small-sized under-bracing. Tolerance: ±5%) and a diameter of 62D (hereinafter, referred to as a large-sized under-bracing. Tolerance: ±5%), respectively, that are manufactured and used. If necessary, a medium-sized under-bracing (substitute for l.OM under-bracing) is manufactured and used. Such a difference in the diameter between earth wire under-bracings is formed by taking a variable application depending on a target to be applied into account. That is, the earth pressure and bearing capacity that the earth wire under-bracing receives increases in proportion to the cross-sectional area of the upper part of a conventional rectangular earth wire under-bracing and the cross- sectional area of the upper part of a newly developed round earth wire under-bracing, thus earth wire under-bracing having a proper diameter is applied depending on the unbalanced tensile force of a wire that the utility pole receives.
[13] Further, the earth wire under-bracing having the aforementioned numeric value is for substituting a conventional earth wire under-bracing having a rectangular block shape. The conventional rectangular earth wire under-bracing has a length of 0.7M, l.OM, and 1.2M in a longitudinal direction.
[14] In order to bury the earth wire under-bracing manufactured in a round block shape, a burial hole having a predetermined inner diameter has to be excavated by using an auger crane. An excavation diameter of an exiting auger crane is limited to 50D, so it is possible to construct a small-sized under-bracing having a diameter of 43D that is manufactured as an substitute for a 0.7M earth wire under-bracing, while it is impossible to perform a mechanized construction of a large-sized under-bracing having a diameter of 62D that is manufactured as an substitute for l.OM and 1.2M earth wire under-bracing by using an existing auger crane.
[15] Therefore, in order to bury a large-sized earth wire under-bracing having a diameter of 62D, excessive working hours and labor are consumed due to a human- powered excavation, so it is very uneconomical. Further, the construction quality and the construction techniques are not stabilized, thereby sharply degrading the working efficiency.
[16] To overcome the above problems, Korean Patent Application No. 2005-126562 filed by the applicant of the present invention discloses a new technology construction method by which an excavation hole suitable for the size of a round earth wire under- bracing can be formed by mounting an excavation section at the lower end of an auger that is used for an auger crane and expanding and contracting the excavation site to the left and right to improve the operating capacity.
[17] According to the mechanized construction method for earth wire under-bracing and
an expansion type excavation section for an auger crane for the method disclosed in the aforementioned patent application, it is possible to perform a mechanized construction of a large-sized round earth wire under-bracing by using an auger crane, and reduce the construction hours and labor. Moreover, the construction quality is improved, and the construction stability and the working efficiency are enhanced by a mechanized construction technique, thereby contributing to the improvement of business efficiency of a construction company.
[18]
[19]
Disclosure of Invention Technical Problem
[20] In the construction of such earth wire under-bracing, as described above, a human- powered excavation or an excavation method using an auger crane or backhoe is used. However, as generally known, the human-powered excavation method is very uneconomical, and the use of the excavation method using the auger crane is restricted to a place where a vehicle can enter, and an earth wire work at a place where a vehicle cannot enter has to be performed by a human-powered excavation, which causes an increase in construction cost.
[21] Particularly, in a case where a conventional rectangular under-bracing is excavated and constructed by a backhoe as described above, it is problematic in that excessive earth and sand is excavated, and the cohesive power of the ground refilled after burial is weakened to make the drawing force of the earth wire weaker. Further, the earth and sand excavated at excessively large area causes damage to the environment of and obstruction in traffic, thereby incurring the enmity of the people. Meanwhile, in a case where a round earth wire under-bracing is constructed, a different excavation method is applied. Thus, when a rectangular earth wire under-bracing in stock is constructed or a new developed round earth wire under-bracing is used, the work becomes complicated, thereby degrading the working efficiency. Technical Solution
[22] To overcome the above-described problems, it is an object of the present invention to provide a mechanized construction method for earth wire under-bracing using a backhoe in which a vertical excavation section having a vertical surface and a sloped excavation section having a sloped surface are formed, respectively, by using an excavation bucket of the backhoe, a round earth wire under-bracing developed by a new technology is mounted on these excavation sections without using a rectangular earth wire under-bracing, and then an earth wire rod of the round earth wire under- bracing is positioned at a slope by the sloped excavation section.
[23]
Advantageous Effects
[24] According to the mechanized construction method for round earth wire under- bracing using a backhoe in accordance with the present invention, since a novel round earth wire under-bracing, rather than a conventional rectangular earth wire under- bracing, is used, it is possible to perform a general excavation work using a backhoe and sharply improve the working efficiency and equipment operating efficiency as compared to a conventional human-powered excavation or auger crane excavation method. Further, the mechanized construction method becomes more convenient, which allows it to further accelerates a mechanized construction for earth wire under- bracing, and reduce the working hours and labor. Further, the construction quality is improved, and the construction stability and working efficiency are enhanced by a mechanized construction technique, thereby contributing to the improvement of business efficiency of a construction company.
[25]
Brief Description of the Drawings
[26] FIG. 1 is a cross-sectional view showing a backhoe moved to a target ground according to a mechanized construction method according to the present invention;
[27] FIG. 2 is a cross-sectional view showing a sloped excavation section formed by a backhoe;
[28] FIG. 3 is a cross-sectional view showing a round earth wire under-bracing inserted into an excavation site;
[29] FIG. 4 is a cross-sectional view showing a refilled state of an excavation site into which a round earth wire under-bracing is inserted;
[30] FIG. 5 is a cross-sectional view showing an excavation state of a conventional rectangular under-bracing and a new round under-bracing by comparison.
[31] <Explanation of the Reference Numerals for the Main Parts of the Drawings>
[32] 1: vertical excavation section 2: sloped excavation section
[33] 10: round earth wire under-bracing 11: earth wire rod
Best Mode for Carrying Out the Invention
[34] Hereinafter, a mechanized construction method for round earth wire under-bracing using a backhoe according to the present invention will be described. First, a backhoe having an excavation bucket mounted thereon, the excavation bucket having a width suitable for the specification of the round earth wire under-bracing is moved to a target ground where the round earth wire under-bracing is to be buried.
[35] Next, the target ground is excavated by the excavation bucket. At this time, a vertical excavation section having a vertical surface using a backhoe and a sloped
excavation section having a sloping surface formed toward a utility pole are formed respectively.
[36] The front end of the round earth wire under-bracing mounted on the bottom surface of the vertical excavation section is exposed on the ground surface as its earth wire rod is positioned at a sloped state along the sloped excavation section. The round earth wire under-bracing and the earth wire rod are buried in the target ground by a refilling process of the excavation site. Mode for the Invention
[37] As illustrated in the drawings, a mechanized construction method for round earth wire under-bracing according to the present invention is performed by using a generally used backhoe, and this backhoe can be used by replacing excavation buckets of various sizes with one another. Therefore, it is possible to excavate a target ground more conveniently and quickly by using an excavation bucket having a width or size suitable for the specification of the round earth wire under-bracing.
[38] That is, as illustrated in FIG. 1, the backhoe is moved to a target excavation position, and the corresponding target ground is vertically excavated, thereby forming a vertical excavation section 1 having a vertical surface.
[39] Once such a vertical excavation section 1 is formed, as shown in FIG. 2, a sloped excavation section 2 having a sloped surface is formed toward a utility pole. The sloped excavation section 2 serves to position the earth wire rod 11 coupled to the round earth wire under-bracing 10 toward the utility pole (not shown).
[40] As above, once the vertical excavation section 1 and the sloped excavation section 2 are formed in such a manner that the round earth wire under-bracing 10 and the earth wire rod 11 can be mounted thereon by the backhoe, as shown in FIG. 3, the round earth wire under-bracing 10 and the earth wire rod 11 are mounted in these excavation sections while maintaining a precise angle by using a guide rope 12 or the like. At this time, the earth wire rod 11 coupled to the center of the round earth wire under-bracing 10 is positioned along the sloped excavation section 2.
[41] In this state, as shown in FIG. 4, if the excavation site is refilled by the backhoe, the round earth wire under-bracing 10 is firmly buried, and at the same time the earth wire rod 11 drawn from the round earth under-bracing 10 is positioned at a slope toward a utility pole, so the utility pole and the end of the earth wire rod 11 can be connected and firmly fixed by using a rope or wire or the like.
[42] Such a construction method uses a general backhoe which can make the supply and demand of equipment easier than an auger crane, and enables the operation even at a place where a vehicle cannot enter, a new developed round earth rod can be used without using a conventional rectangular earth wire rod. Due to this, as shown in FIG.
5, as an excavation site is excavated to an optimum shape, the amount of earth and sand can be minimized for precise excavation, thereby increasing the construction efficiency.
[43]
Industrial Applicability
[44] According to the mechanized construction method for earth wire under-bracing using a backhoe of the present invention, it is possible to perform a mechanized construction of a large-sized round earth wire under-bracing by using an auger crane, and reduce the construction hours and labor. Moreover, the construction quality is improved, and the construction stability and the working efficiency are enhanced by a mechanized construction technique, thereby contributing to the improvement of business efficiency of a construction company.