KR102623584B1 - Step nut assembly and manufacturing method of concrete electric pole using the step nut assembly - Google Patents

Abstract

The present invention relates to a method for manufacturing a concrete electric pole using a step nut that is installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole in order to be able to combine with a step bolt installed on the outer peripheral surface of the concrete electric pole, for mortar pouring. Preparing a mold in which a pouring space is formed, a temporary step bolt for fastening the step nut by combining with the step nut, and a step nut having a groove formed in the longitudinal direction to be coupled to the temporary step bolt. Preparing a step nut assembly comprising a step of installing the step nut assembly, which is coupled with the temporary step bolt and passing through the mold to place the step nut in the pouring space; placing mortar into the pouring space of the mold A mortar pouring step of putting in the mortar, and after the mortar is cured, a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete, and preparing the mold. The step of forming a step nut installation hole in the mold at a position where the step nut is installed so that the step nut coupled with the temporary step bolt can easily penetrate the mold, and the temporary step bolt and When the coupled step nut penetrates the step nut installation hole, the step nut installation hole is formed in the mold in order to arrange the step nut to be fixed to the pouring space by fixing the temporary step bolt. It includes the step of installing a step bolt fixing part in a position, and in the step of installing the step nut assembly, the step nut coupled with the temporary step bolt penetrates the step bolt fixing part and the step nut installation hole. A method of manufacturing a concrete electric pole is provided, which is disposed in a pouring space, and the temporary step bolt is fixed by combining with the step bolt fixing part.
Therefore, the steel material can be stably fixed by being fixed to a hole formed in a steel fixing unit including an inner fixing plate and an outer fixing plate that are detachably coupled.

Description

Step nut assembly and manufacturing method of concrete electric pole using the step nut assembly {Step nut assembly and manufacturing method of concrete electric pole using the step nut assembly}

The present invention relates to a step nut assembly and a method of manufacturing a concrete electric pole using the step nut assembly. More specifically, a step nut assembly that can easily and stably embed a step nut into a concrete electric pole and a method of manufacturing a concrete electric pole using the step nut assembly. This relates to the manufacturing method of concrete electric poles.

Step bolts are fastened to one side of a pole when a worker climbs directly to the top of an electric pole, which is a pole erected to extend electric wires or communication lines, and installs, maintains, and repairs electric wires, insulators, or transformers. This allows the worker to step on it, allowing the worker to fasten, install, and dismantle as needed. Conventionally, in order to install such a step bolt, a step nut is buried inside the electric pole.

However, when using the conventional step nut embedding process, the process for embedding the step nut is complicated, and it is difficult to accurately fix the step nut in the desired position when pouring mortar. In addition, there is a problem in that the step nuts cannot be installed efficiently because various fixing devices with complex configurations are used to firmly fix the step nuts without moving them when pouring mortar.

Republic of Korea Patent No. 10-2459380

The purpose of the present invention is to provide a step nut assembly that can easily and stably embed a step nut into a concrete electric pole, and a method of manufacturing a concrete electric pole using the step nut assembly.

According to one aspect of the present invention, the present invention is to manufacture a concrete electric pole using a step nut that is installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole in order to be able to combine with the step bolt installed on the outer peripheral surface of the concrete electric pole. The method includes preparing a mold in which a pouring space for mortar pouring is formed, a temporary step bolt for fastening the step nut by engaging the step nut, and a longitudinal step to be coupled to the temporary step bolt. Preparing a step nut assembly including the step nut in which a groove is formed, installing a step nut assembly in which the step nut coupled with the temporary step bolt penetrates the mold and is placed in the pouring space. , a mortar pouring step of injecting mortar into the pouring space of the mold, and after the mortar is cured, a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete. The step of preparing the mold includes forming a step nut installation hole in the mold at a position where the step nut is installed so that the step nut coupled with the temporary step bolt can easily penetrate the mold. In the mold, in order to arrange the step nut to be fixed to the pouring space by fixing the temporary step bolt when the step nut coupled with the step and the temporary step bolt penetrates the step nut installation hole. It includes the step of installing a step bolt fixing part at a position where the step nut installation hole is formed, and in the step of installing the step nut assembly, the step nut coupled with the temporary step bolt includes a step bolt fixing part and A method of manufacturing a concrete electric pole is provided, which is disposed in the pouring space through the step nut installation hole, and the temporary step bolt is coupled with the step bolt fixing part and fixed.

According to another aspect of the present invention, the present invention is to manufacture a concrete electric pole using a step nut that is installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole so as to be coupled with a step bolt installed on the outer peripheral surface of the concrete electric pole. The method includes preparing a mold having a pouring space for mortar pouring, installing a steel assembly that serves as a tension member in the concrete pole in the mold, and pouring mortar into the pouring space of the mold. Step, a reinforcing bar assembly tensioning step of tensioning the reinforcing bar assembly by applying a tensile force to the reinforcing bar assembly, a temporary step bolt for fixing the step nut by combining with the step nut, and a groove in the longitudinal direction to be coupled to the temporary step bolt Preparing a step nut assembly including the formed step nut, installing the step nut assembly in which the step nut coupled with the temporary step bolt penetrates the mold and is placed in the pouring space, After the mortar is cured, it includes a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete, and the step of preparing the mold includes the temporary step forming a step nut installation hole in the mold at a position where the step nut is installed so that the bolt can easily penetrate the mold; and the step nut coupled with the temporary step bolt penetrates the step nut installation hole. When installing, installing a step bolt fixing part in the mold at a position where the hole for installing the step nut is formed in order to fix the step nut by fixing the temporary step bolt, and installing the step nut assembly. In the step of doing so, the step nut coupled with the temporary step bolt is disposed in the pouring space through the step bolt fixing part and the step nut installation hole, and the temporary step bolt is coupled with the step bolt fixing part. Provides a manufacturing method for fixed concrete electric poles.

According to another aspect of the present invention, the present invention is a step nut assembly used to embed a step nut in a concrete electric pole to conveniently install a step bolt on the outer peripheral surface of the concrete electric pole, and the mortar pouring is performed when manufacturing the concrete electric pole. It penetrates a mold in which a pouring space is formed and a hole for installing the step nut is formed at the position where the step nut is to be installed, and is fixed by combining with a step bolt fixing part installed in the mold at the position where the hole for installing the step nut is formed. A groove is formed in the longitudinal direction to be coupled to the temporary step bolt and the temporary step bolt, and when coupled to the temporary step bolt, the hole for installing the step nut and the step bolt fixing part penetrate the pouring space. A temporary step bolt including a step nut arranged to be fixed to the step nut is coupled to the step bolt fixing part before the reinforcing bar assembly is placed in the mold, or the reinforcing bar assembly is fixed to the mold. After the mortar is placed and fixed to the step bolt fixing part before the mortar is poured, or the mortar is poured into the mold where the reinforcing bar assembly is placed and the reinforcing bar assembly placed in the mold is tensioned, the step bolt fixing part It provides a step nut assembly that is coupled and fixed, but is separated from the step nut and removed when the mortar is cured and the step nut is fixed by the mortar.

The step nut assembly according to the present invention and the method of manufacturing a concrete electric pole using the step nut assembly have the following effects.

First, there is an advantage that the step nut can be easily embedded in the concrete electric pole using only a step nut assembly including a step nut and a temporary step bolt.

Second, since the step nut is fixed through a screw connection with a temporary step bolt, it has the advantage that its position does not change due to external force when pouring mortar.

Third, the step nut embedding is completed simply by separating the temporary step bolt from the step nut after the mortar has cured, which has the advantage of making finishing work simple.

Fourth, since the step nut is inserted and placed from the outside of the mold toward the mortar pouring space inside the mold while coupled to the temporary step bolt, there is an advantage that the step nut can be selectively installed before and after mortar pouring.

Figure 1 is a flowchart showing the overall process of a method of manufacturing a concrete electric pole using a step nut assembly according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the step nut assembly used in the method of manufacturing a concrete electric pole using the step nut assembly according to Figure 1 coupled to a mold.
Figure 3 is a schematic diagram showing the step nut assembly according to Figure 2 and the step bolt fixing part formed in the mold, respectively.
Figure 4 is a schematic diagram showing the separation and removal of temporary step bolts and the removal of the mold after the mortar is cured in the method of manufacturing a concrete electric pole using the step nut assembly according to Figure 1.
Figure 5 is a flow chart showing some processes highly related to step nut installation among the manufacturing methods of concrete electric poles using the step nut assembly according to Figure 1.
Figure 6 is a schematic diagram showing the process of installing the upper and lower molds and accessories installed on the mold among the manufacturing methods of concrete electric poles using the step nut assembly according to Figure 1.
Figure 7 is a perspective view showing a concrete electric pole manufactured by the method of manufacturing a concrete electric pole using a step nut assembly according to Figure 1.
FIG. 8 is a cross-sectional view taken along line VIII-VIII of a concrete electric pole manufactured using the method of manufacturing a concrete electric pole using a step nut assembly according to FIG. 7.
Figure 9 is a cross-sectional view taken along line IX-IX of a concrete electric pole manufactured using the method of manufacturing a concrete electric pole using a step nut assembly according to Figure 7.
Figure 10 is a cross-sectional view taken along the line X-X of a concrete electric pole manufactured using the method of manufacturing a concrete electric pole using a step nut assembly according to Figure 9.
Figure 11 is a cross-sectional view taken along the line ?-? of a concrete electric pole manufactured using the method of manufacturing a concrete electric pole using a step nut assembly according to Figure 9.
Figure 12 is a schematic diagram showing the bending moment for each part of the concrete electric pole manufactured using the manufacturing method of the concrete electric pole using the step nut assembly according to Figure 7.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings.

Referring to Figures 1 to 6, the method (S100) of manufacturing a concrete electric pole using a step nut assembly according to an embodiment of the present invention includes a steel material preparation step (not shown), a mold preparation step (S110), and a step nut assembly. It includes a step of preparing the assembly (S120), a step of installing the step nut assembly (S130), a mortar pouring step (S140), and a step bolt separation step (S150). However, the present invention is not limited to this, and may further include a steel assembly installation step and a steel pre-tensioning step of installing steel materials prepared before the mortar pouring step (S140) in the mold. And after the mortar pouring step (S140), a steel self-strengthening step, centrifugal forming, and steam curing steps may be further included. And, after the step bolt separation step (S150) and the member demolding step for separating the mold, the step of performing finishing work on the concrete electric pole and then shipping it may be further included.

In this embodiment, the steps of preparing the mold (S110), installing the steel assembly, preparing the step nut assembly (S120), and installing the step nut assembly (S130) are performed sequentially. Take this as an example. However, the present invention is not limited to this and includes the steps of preparing the mold (S110), preparing the step nut assembly (S120), installing the step nut assembly (S130), and installing the steel assembly. It may also be performed sequentially.

In addition, in the present invention, the step of preparing the step nut assembly (S120) and the step of installing the step nut assembly (S130) may be performed after the mortar pouring step (S140) and the main expansion step. That is, the method of manufacturing a concrete electric pole using the step nut assembly (S100) includes the step of preparing the mold (S110), the step of installing the steel assembly, the pre-tensioning step, the mortar pouring step (S140), and the step of preparing the mold (S110). The main stretching step (steel assembly tensioning step), the step of preparing the step nut assembly (S120), the step of installing the step nut assembly (S130), and the step of separating the step bolts (S150) may be performed in that order.

The method (S100) of manufacturing a concrete electric pole using a step nut assembly according to this embodiment has the advantage of allowing the step nut to be easily embedded in a concrete electric pole using only a step nut assembly including a step nut and a temporary step bolt. In addition, since the step nuts are fixed through screw combination with temporary step bolts, they have the advantage that their position does not change due to external force when pouring mortar. In addition, the step nut embedding is completed simply by separating the temporary step bolts from the step nuts after the mortar has cured, which has the advantage of making finishing work simple. In addition, since the step nuts are inserted and placed from the outside of the mold toward the mortar pouring space inside the mold while coupled to the temporary step bolts, there is an advantage that the step nuts can be selectively installed before and after mortar pouring.

The steel preparation step is a process of preparing steel that is used as a tension member in the concrete electric pole and is arranged to extend from one end to the other end along the longitudinal direction of the concrete electric pole. In this embodiment, the steel material is a PC steel bar as an example. And the steel preparation step further includes a steel assembly forming step. In the steel assembly forming step, a plurality of steel materials are prepared, and the steel materials are arranged along the longitudinal direction of the concrete electric pole and spaced apart in the circumferential direction. And it is a process of arranging spiral reinforcement so that it is combined with and fixed to the steel materials.

The step of preparing the mold (S110) is a process of preparing a mold (M) in which a pouring space for mortar pouring is formed and a step nut installation hole is formed at a position where the step nut is to be installed. The step nut installation holes are formed to be spaced apart at a set interval along the longitudinal direction of the mold (M). The step nut installation hole communicates with the outside of the mold and the pouring space. In this embodiment, the mold M includes a hollow semi-cylindrical lower mold and a hollow semi-cylindrical upper mold. The lower mold and the upper mold are combined to form a molding space within the mold (M) for manufacturing the concrete electric pole. The lower mold and the upper mold each have a shape cut in half along the longitudinal direction corresponding to the outer peripheral surface of the concrete electric pole.

Specifically, the step of preparing the mold (S110) includes preparing a mold in which the step nut installation hole is not formed, forming a step nut installation hole (mold hole), and installing a step bolt fixing part. . The step nut installation hole forming step is a process of forming the step nut installation hole at a location where the step nut 1300 is to be installed in a mold in which the step nut installation hole is not formed.

And the step of installing the step bolt fixing part is a process of installing the step bolt fixing part for fixing the temporary step bolt installed to fix the step nut. The step bolt fixing part is disposed at a position where the step nut installation hole is formed and is fixed to the mold. That is, the step of installing the step bolt fixing part is when the step nut coupled with the temporary step bolt penetrates the step nut installation hole, by fixing the temporary step bolt, the step nut is installed in the pouring space. This is a process of installing the step bolt fixing part in the mold at the position where the hole for installing the step nut is formed.

The step bolt fixing unit can adjust the length into which the temporary step bolt is inserted while screwing with the temporary step bolt when the temporary step bolt penetrates the step nut installation hole. The process of installing the step bolt fixture will be described in detail below after explaining the structure of the step bolt fixture. In this embodiment, the step bolt fixing part is installed in the step of preparing the mold (S110), but the step bolt fixing part is installed in the mold in the step of installing the step nut assembly (S130). It may be possible.

The step of preparing the step nut assembly (S120) includes a temporary step bolt for fixing the step nut 1300 in a fixed state by engaging with the step bolt fixing part, and a longitudinal bolt to be coupled to the temporary step bolt. This is a process of preparing a step nut assembly including the step nut in which a groove is formed. The temporary step bolt is a unit that is installed and then removed during the manufacturing process of the concrete electric pole, unlike the step bolt that is coupled to the step nut after the concrete electric pole is completed and is stepped on by the worker.

In the step of installing the step nut assembly (S130), the step nut is coupled to the temporary step bolt. And the step nut coupled to the temporary step bolt 1200 is penetrated from the outside to the inside of the mold (M). That is, the step nut penetrates the mold (M) and the step bolt fixing part. And the temporary step bolt is coupled to the step bolt fixing part so that the head opposite to the temporary step bolt (the part where the step nut is coupled) is fixed in a state that protrudes into the pouring space of the mold.

With reference to FIGS. 2 and 3, the step nut embedding device 1000 for embedding the step nut 1300 in the concrete electric pole will be described in detail. The step nut embedding device 1000 includes a step bolt fixing part 1100, a temporary step bolt 1200, and a step nut 1300. The step bolt fixing part 1100 is installed to fix the temporary step bolt 1200 when the temporary step bolt 1200 penetrates the stem nut installation hole of the mold (M). The step bolt fixing part 1100 also serves to adjust the depth at which the temporary step bolt 1200 is inserted.

The step bolt fixing part 1100 includes a lower fixing part 1110 and an upper fixing part 1120. The lower fixing part 1110 has a first hollow 1110a formed inside (the center part) in the longitudinal direction of the step bolt fixing part 1100, and the first hollow 1110a is formed in the mold M. It is coupled to the mold (M) so as to communicate with the pouring space. In this embodiment, the lower fixing part 1110 is arranged to be inserted between the outer peripheral surface and the inner peripheral surface of the mold M (a portion forming the thickness of the mold). The lower part of the lower fixing part 1110 is open.

The upper fixing part 1120 integrally extends upward from the upper part of the lower fixing part 1110. The upper fixing part 1120 has a second hollow 1120a in communication with the first hollow 1110a formed at the center in the longitudinal direction of the step bolt fixing part 1100. At this time, the second hollow (1120a) has a larger diameter than the first hollow (1110a). Accordingly, a step portion is formed at a connection portion between the upper fixing part 1120 and the lower fixing part 1110. And a screw thread is formed on the inner peripheral surface of the second hollow (1120a). And the upper part of the upper fixing part 1120 is open.

In the step of installing the step bolt fixing part, the lower fixing part 1110 is inserted and coupled between the outer peripheral surface and the inner peripheral surface of the mold (M) in the direction from the outer peripheral surface to the inner peripheral surface of the mold (M). At this time, the upper fixing part 1120 is coupled so that its lower part is seated on the outer peripheral surface of the mold (M). In this embodiment, the step bolt fixing part 1110 is coupled to the mold (M) through welding as an example, but the method of fixing the step bolt fixing part 1110 to the mold (M) can be varied. possible.

The temporary step bolt 1200 includes a nut coupling portion 1210, a first central protrusion 1220, a second central protrusion 1230, and a bolt head portion 1240. The nut coupling portion 1210 extends in the longitudinal direction of the temporary step bolt 1200, and has threads formed on the outer peripheral surface. Specifically, the nut coupling portion 1210 extends a set length in the direction of the bolt head portion 1240 from one side, which is the opposite end of the bolt head portion 1240.

One side of the first central protrusion 1220 in the longitudinal direction is integrally connected to the other extended end of the nut coupling portion 1210, and extends in the longitudinal direction. In addition, the first central protrusion 1220 has a larger diameter than the nut coupling portion 1110 and thus protrudes further in the direction intersecting the longitudinal direction than the nut coupling portion 1110.

One side of the second central protrusion 1230 in the longitudinal direction is integrally connected to the other extended side of the first central protrusion 1220, and extends in the longitudinal direction. In addition, the second central protrusion 1230 has a larger diameter than the first central protrusion 1220 and thus protrudes further in the direction intersecting the longitudinal direction than the first central protrusion 1220. And a screw thread is formed on the outer peripheral surface of the second central protrusion 1220.

The bolt head portion 1240 has one side in the longitudinal direction integrally connected to the other extended side of the second central protrusion 1230 and extends in the longitudinal direction. The side surface of the bolt head portion 1240 is formed in a polyhedral structure.

The step nut 1300 has a groove 1300a formed in the longitudinal direction to be coupled to the temporary step bolt 1200. Specifically, the step nut 1300 has a bolt coupling groove 1300a formed therein to which the nut coupling portion 1210 of the temporary step bolt 1200 is coupled. In addition, threads are formed on the inner peripheral surface of the bolt coupling groove 1300a to enable screw coupling with the nut coupling portion 1210. And one side of the bolt coupling groove 1300a is open, and the other side of the bolt coupling groove 1300a is closed.

One open side of the step nut 1300 is arranged to be in close contact with the inner peripheral surface of the pouring space of the mold M. This is done by coupling the nut of the temporary step bolt 1200 in the direction of the pouring space of the mold (M) from the outer peripheral surface of the mold (M) in a state in which the step nut (1300) is coupled to the temporary step bolt (1200). This is performed by penetrating the part 1210 and fixing the temporary step bolt 1200 to the step bolt fixing part 1100.

In this embodiment, the temporary step bolt 1200 and the step bolt fixing part 1100 are formed of a steel material. However, the present invention is not limited to this, and the temporary step bolt 1200 and the step bolt fixing part 1100 can be changed to plastic or other materials. The temporary step bolt 1200 and the step bolt fixing part 1100 are not embedded in or attached to the concrete electric pole after the production of the concrete electric pole is completed, and are used only when manufacturing the concrete electric pole, so they are inexpensive materials. There is no problem even if you use . And in this embodiment, the step nut 1300 is formed of a steel material. The step nut 1300 remains embedded in the concrete electric pole even after the production of the concrete electric pole is completed, and a step bolt for use when a worker climbs the electric pole must be coupled to the step nut 1300, so steel with strong rigidity Alternatively, it may be made of a material with stronger rigidity.

The step of installing the step nut assembly (S130) is to couple the step nut assembly in which the temporary step bolt 1200 and the step nut 1300 are combined to the step bolt fixing part 1100 to secure the step nut 1300. ) is a process of ensuring that the mold (M) is fixed to the pouring space of the mold (M). The step of installing the step nut assembly (S130) includes coupling the temporary step bolt 1200 and the step nut 1300 and coupling the step nut assembly to the step bolt fixing unit 1100. The step of combining the temporary step bolt 1200 and the step nut 1300 is performed by connecting the thread formed on the inner peripheral surface of the step bolt coupling groove 1300a of the step nut 1300 to the temporary step bolt 1200. This is a process of integrating with the screw thread formed on the outer peripheral surface of the nut coupling portion 1210 by screwing it.

The step of coupling the step nut assembly to the step bolt fixing part 1100 involves connecting the step nut 1300 coupled to the nut coupling part 1210 to the upper fixing part 1120 of the step bolt fixing part 1100 and This is a process of sequentially passing through the lower fixing parts 1110 and placing them in the pouring space. At this time, the first central protrusion 1220 penetrates the upper fixing part 1120 and is disposed in the first hollow 1110a of the lower fixing part 1110. And the second central protrusion 1230 is screwed to the thread formed on the inner peripheral surface of the second hollow 1120a, and the lower surface is formed on the inside of the lower fixing part 1110 and the upper fixing part 1120. It is seated on the step. And the side surface of the second central protrusion 1230 is arranged to be surrounded by the inner peripheral surface of the upper fixing part 1120.

The mortar pouring step (S140) is a process of injecting mortar into the pouring space of the mold. Before the mortar pouring step (S140), a pre-tensioning step is performed in which tension is applied to both ends of the steel members of the steel assembly so that they are fixed in place without being deformed during the mortar pouring process.

The pre-tensioning step is a process of applying tension to both ends of the steel materials so that the steel materials are fixed in place without being deformed during the mortar insertion process. Specifically, one side is fixed and force is applied from the other side. The joining step and mortar input step are performed while the steel materials are tensioned by the steel material pretensioning step. The pre-tensioning step is performed to prevent the steel materials from being deformed, such as being bent by contact with the poured mortar, during the process of pouring mortar into the mold M. The tensile force applied in the pre-tensioning step is the minimum tensile force derived through prior experiments while varying the composition ratio and pouring speed of the mortar poured into the mold 30 so that the steel materials are not deformed during mortar pouring. apply However, the present invention is not limited to this, and the tensile force may be stronger than the minimum tensile force.

A joining step is performed before or after the pretensioning step. The joining step is a process of forming a space for pouring mortar inside the mold (M). In the joining step, the steel assembly is fixed in the inner space of the lower mold of the mold (M), and then the upper mold is combined with the lower mold to be molded. Figure 6 shows an example of combining the upper and lower molds of the mold (M), installing accessories on the upper mold, rotating the mold (M) 180 degrees, and then installing the accessories on the lower mold. The accessories may be various parts installed in the mold (M).

A main expansion step is further included between the mortar pouring step (S140) and the step bolt separation step (S150). In the large tension step, tensile force is applied to the steel materials embedded in the mortar poured in the mortar pouring step (S140), thereby tensing the steel materials. Centrifugal forming is performed in a state in which the steel materials are tensioned by the large tension step. The centrifugal molding is a process of centrifugal molding by rotating the mold (M) into which the mortar is placed. As the mold (M) rotates through the centrifugal molding, the mortar introduced into the mold (M) moves radially outward by centrifugal force, forming the shape of an electric pole body with a hollow formed in the center.

The step bolt separation step (S150) is a process of separating and removing the temporary step bolt 1200 from the step nut 1300 while the step nut 1300 is fixed to the concrete after the mortar is cured. am. By simply unscrewing the temporary step bolt 1200 and the step nut 1300 without additional finishing work, the step nut 1300 can be maintained embedded in the concrete electric pole.

7 to 12, the method (S200) of manufacturing a concrete electric pole using a step nut assembly according to another embodiment of the present invention includes a steel material preparation step (not shown), a mold preparation step (S210), and a step nut assembly. It includes a step of preparing the assembly (S220), a step of installing the step nut assembly (S230), a mortar pouring step (S240), and a step bolt separation step (S250). The manufacturing method (S200) of a concrete electric pole using a step nut assembly according to this embodiment has a difference in the steel preparation step when compared to the manufacturing method (S100) of a concrete electric pole using a step nut assembly according to FIGS. 1 to 6, Since the remaining steps are similar, the steel materials (steel assembly) will be described in detail and the detailed description of the remaining steps will be omitted.

In the steel preparation step of this embodiment, a steel assembly for manufacturing the concrete electric pole 100 is prepared using PC steel wire as a tension member. This is different from preparing a steel assembly using PC steel bars (steel materials) as tension members (tension members) in the steel preparation step according to FIGS. 1 to 6. When manufacturing concrete electric poles using PC steel wire, resistance to stress corrosion cracking is improved by using PC steel wire rather than PC steel rod as the tendon. In addition, since the PC steel wire, which is a tension material, is not integrated with the reinforcing bar and spiral rebar and is tensioned in an independently arranged state, there is no problem of the weld with the spiral rebar falling off during tension work, and there is no interference when inserting an attachment, so the spiral rebar is not integrated. It has the advantage of not having to cut the rebar.

Hereinafter, for convenience of explanation, the concrete electric pole 100 manufactured using the PC steel wire as a tension member will first be described. Using the PC steel wire as a tension member, the concrete electric pole 100 includes a electric pole body 110, a PC steel bar 120, a guide wire 130, a spiral rebar 140, and a PC steel wire 150. The electric pole body 110 is made of concrete. The electric pole body 110 has a rod shape extending long along the straight central axis (X). Inside the electric pole body 110, a hollow is formed that extends along the central axis (X) and penetrates the center of the electric pole body 110. The outer and inner circumferences of the electric pole body 110 are generally circular and form concentric circles.

The electric pole body 110 includes a plurality of PC steel bars 120, the guide wires 130, the spiral reinforcement bars 140, and the PC steel wires 150. Both ends of the electric pole body 110 in the longitudinal direction form a circular sphere 111 and a sphere 112 of the concrete electric pole 100, respectively. In this embodiment, the electric pole body 110 has a truncated cone shape that gradually becomes thinner from the circular sphere 111 toward the end sphere 112.

The electric pole body 110 serves as a covering to protect the PC steel bar 120, the guide wire 130, the spiral reinforcement bar 140, and the PC steel wire 150 from the external environment. And the electric pole body 110 plays a role of resistance to concrete compressive force. And the thickness of the electric pole body 110 may change depending on the PC steel bar 120, the guide wire 130, the spiral reinforcement 140, and the PC steel wire 150 used.

The PC steel rod 120 is disposed between the inner peripheral surface and the outer peripheral surface of the electric pole body 110. In addition, a plurality of PC steel bars 120 are embedded in a circumferential direction and spaced apart from each other. Specifically, a plurality of PC steel rods 120 are arranged to be spaced apart so as to have a concentric circular structure with the inner peripheral surface (or outer peripheral surface) of the electric pole body 110. However, the present invention is not limited to this, and the arrangement structure of the PC steel bars 120 can be changed as much as desired.

And the PC steel bar 120 extends a set length from the bottom to the top along the longitudinal direction of the electric pole body 110. In this embodiment, the PC steel bar 120 is formed to have a length equal to or shorter than half the length of the electric pole body 110. However, the present invention is not limited to this, and the length of the PC steel bar 120 may be formed to be longer than half the length of the electric pole body 110.

The PC steel bar 120 is a non-tension material and serves to supplement the bending resistance of the PC steel wire 150, which is a tension material disposed in the longitudinal direction of the electric pole body 110. Typically, load and wind loads occur mainly in the upper (spherical) part of a concrete utility pole, and when the moment is calculated accordingly, the largest moment occurs in the lower (spherical) part. Therefore, the PC steel bar 120 is placed focusing on the lower part to reinforce bending resistance.

The guide wire 130 is disposed between the inner and outer peripheral surfaces of the electric pole body 110. At this time, the guide wire 130 is arranged so as not to interfere with the PC steel bar 120. In addition, a plurality of guide wires 130 are embedded and spaced apart in the circumferential direction. Specifically, a plurality of guide wires 130 are arranged to be spaced apart so as to have a concentric circular structure with the inner peripheral surface (or outer peripheral surface) of the electric pole body 110.

And in this embodiment, the guide wires 130 are arranged so that the radii are the same as the concentric circles formed by the PC steel bars 120. Specifically, the sum of the length from the center of the electric pole body 110 to the center of the guide wires 130 and the length of the radius of the guide wire 130 is the PC steel bar ( 120) is formed to be equal to the sum of the length to the center of the bars and the length of the radius of the PC steel bar. That is, the guide wires 130 and the PC steel rods 120 are arranged to have a circular shape when connected to each other.

And in this embodiment, the guide wires 130 are disposed between the PC steel bars 120 as an example. That is, the guide wires 130 and the PC steel bars 120 are arranged alternately. However, the present invention is not limited to this, and the arrangement structure of the guide wires 130 can be changed as much as desired.

And the guide wire 130 extends from the bottom to the top along the longitudinal direction of the electric pole body 110. That is, the guide wire 130 extends in parallel with the PC steel bar 120 from the lower part of the electric pole body 110 to the part where the PC steel bar 120 extends upward. However, the guide wire 130 extends further from the end where the PC steel bar 120 extends to the upper part of the electric pole body 110.

The guide wire 130 serves to support the upper part of the spiral reinforcement 140, which will be described below. The lower part of the spiral reinforcing bar 140 is supported by the PC steel bars 120, but the upper portions of the ends of the PC steel bars 120 do not have a member to support the spiral reinforcing bar 140. Since the PC steel wire 150 cannot be welded due to its composition, the upper part of the spiral rebar 140 cannot be supported through welding. Therefore, the shape of the upper part of the spiral reinforcing bar 140 is maintained by using the guide wire 130 extending from the lower part of the electric pole body 110 to the upper part. Of course, the guide wire 130 may also serve to maintain the shape of the lower part of the spiral reinforcement 140.

The spiral reinforcing bar 140 extends spirally from the bottom to the top along the longitudinal direction of the electric pole body 110. At this time, the spiral reinforcing bar 140 is coupled with and fixed to the PC steel bars 120 and the guide wires 130. In this embodiment, the spiral reinforcing bar 140 is welded to the PC steel bar 120 and the guide wire 130, respectively, and is integrally coupled and fixed.

That is, the spiral reinforcing bar 140 includes the PC steel bars 120 and the guide wires 130 from the lower part of the body 110 to the part where the PC steel bar 120 extends the set length. Each is joined by welding. However, the spiral reinforcing bar 140 is welded only with the guide wire 130 from the end where the PC steel bar 120 extends to the top of the electric pole body 110.

And in this embodiment, the spiral reinforcing bar 140 is arranged to surround the PC steel bars 120 and the guide wires 130 as an example. That is, the PC steel bars 120 and guide wires 130 are welded so as to be in close contact with the inner peripheral surface of the spiral reinforcing bar 140.

However, the present invention is not limited to this, and the PC steel bars 120 and the guide wire 130 may be arranged to be in close contact with the outer peripheral surface of the spiral reinforcing bar 140. Alternatively, the PC steel bars 120 may be arranged to be in close contact with the inner peripheral surface of the spiral reinforcing bar 140, and the guide wires 130 may be arranged to be in close contact with the outer peripheral surface of the spiral reinforcing bar 140. Alternatively, the PC steel bars 120 may be arranged to be in close contact with the outer peripheral surface of the spiral reinforcing bar 140, and the guide wires 130 may be arranged to be in close contact with the inner peripheral surface of the spiral reinforcing bar 140.

The PC steel wire 150 is disposed between the inner and outer peripheral surfaces of the electric pole body 110. And the PC steel wire 150 is arranged to be spaced apart in a plurality in the circumferential direction. In addition, the concrete electric pole 100 using PC steel wire according to this embodiment has a different configuration during tension work because the PC steel wire 150, which serves as a tension member, is arranged to be spaced apart from other steel materials including the spiral reinforcing bar 130. Since there is no interference with other elements, each member can provide integrated performance. Specifically, the PC steel wires 150 have a structure in which they are separated from each other so as not to contact the PC steel bar 120, the guide wire 130, and the spiral reinforcement bar 140 and are not directly integrated with each other. That is, the PC steel wires 150 may have a structure integrated with the PC steel bar 120, the guide wire 130, and the spiral reinforcing bar 140 by the electric pole body 110, but are directly contacted by welding, etc. Because it does not have a fixed structure, it is advantageous for independent performance. That is, even if the PC steel wires 150 are arranged in a structure in contact with the PC steel bar 120, the guide wire 130, or the spiral reinforcing bar 140, they are not fixed by welding or the like.

In this embodiment, the PC steel wires 150 are arranged at equal intervals. However, the present invention is not limited to this, and the PC steel wires 150 may be arranged so that the distances between them are different. And the PC steel wires 150 are embedded to be spaced apart from the spiral reinforcing bars 140 by a set length. In this embodiment, the PC steel wires 150 are disposed closer to the center of the electric pole body 110 than the spiral reinforcing bars 130. However, the present invention is not limited to this, and the PC steel wires 150 may be disposed at a position farther from the center of the electric pole body 110 than the spiral reinforcing bar 130. And the PC steel wires 150 extend from the bottom to the top along the longitudinal direction of the electric pole body 110.

In this embodiment, the PC steel wires 150 serve as tension members that are tensioned by receiving tensile force. The PC steel wire 150 has a microstructure that has a higher resistance to cracking compared to the PC steel bar 120. The PC steel bar 120 has a tensile strength of 14,000 kg/cm2, while the PC steel wire 150 has a high tensile strength of 19,500 kg/cm2. Therefore, the concrete electric pole 100 using PC steel wire according to this embodiment has the advantage of having higher resistance to stress corrosion cracking compared to the case of using PC steel bars as tendons.

In addition, the PC steel wire 150 has the advantage of having a higher level of bending resistance because its tensile strength is also high. And because ductility is also excellent, the resilience to displacement is relatively excellent, so even if the structure momentarily yields due to a large lateral force, it has the advantage of being restored to a certain level without fracture.

And the PC steel wires 150 are arranged to be spaced apart from the PC steel bars 120 and the guide wires 130, respectively. And the PC steel wires 150 are disposed between the PC steel bars 120 and the guide wires 130. In this embodiment, the PC steel wires 150 are disposed closer to the center of the electric pole body 110 than the PC steel bars 120 and the guide wire 130, so the PC steel bars 120 and the As an example, the guide wire 130 is arranged in a zigzag shape. However, the arrangement structure of the PC steel wires 150 can be changed at any time.

In addition, in the concrete electric pole 100 using PC steel wire according to this embodiment, the PC steel wire 150, which serves as a tension member, is arranged to be spaced apart from the spiral reinforcing bars 130, so that interference with other components occurs during tensioning work. By not doing so, each member can demonstrate integrated performance. When the steel preparation step is completed, the steps include preparing the mold (S210), preparing the step nut assembly (S220), installing the step nut assembly (S230), placing mortar (S240), and separating step bolts (S250). ) are carried out sequentially.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims.

1000: Step nut embedding device
1100: Step bolt fixing part
1110: Lower fixing part
1120: upper fixture
1200: Temporary step bolt
1210: Nut joint
1220: First central protrusion
1230: Second central protrusion
1240: Bolt head part
1300: Step nut
1300a: Bolt connection groove
M: mold
100: Concrete electric pole
110: Electric pole body
120: PC steel bar
130: Guide wire
140: Spiral rebar
150: PC steel wire

Claims (9)

In order to be able to combine with the step bolt installed on the outer peripheral surface of the concrete electric pole, a method of manufacturing a concrete electric pole using a step nut installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole,
Preparing a mold in which a pouring space for mortar pouring is formed;
Preparing a step nut assembly including a temporary step bolt for fixing the step nut by combining with the step nut, and the step nut having a groove formed in the longitudinal direction to be coupled to the temporary step bolt;
Installing a step nut assembly in which the step nut coupled with the temporary step bolt penetrates the mold and is placed in the pouring space;
A mortar pouring step of injecting mortar into the pouring space of the mold; and
After the mortar is cured, it includes a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete,
The step of preparing the mold is,
forming a step nut installation hole in the mold at a position where the step nut is installed so that the step nut coupled with the temporary step bolt can easily penetrate the mold; and
In order to arrange the step nut to be fixed to the pouring space by fixing the temporary step bolt when the step nut coupled with the temporary step bolt penetrates the step nut installation hole, the step is installed in the mold. It includes the step of installing a step bolt fixture at a position where a hole for installing a nut is formed,
In the step of installing the step nut assembly,
The step nut coupled with the step bolt for temporary use is disposed in the pouring space through the step bolt fixing part and the hole for installing the step nut, and the step bolt for temporary use is coupled with and fixed to the step bolt fixing part,
The step bolt fixing part,
a lower fixing part having a first hollow formed therein and coupled to the mold so that the first hollow communicates with the pouring space; and
It extends integrally upward from the upper part of the lower fixing part, and has a second hollow formed therein that communicates with the first hollow. The second hollow has a larger diameter than the first hollow, so that the lower part An upper fixing part having a step formed at a portion connected to the fixing part and having a screw thread formed on the inner peripheral surface of the second hollow,
In the step of installing the step bolt fixture,
The lower fixing part is coupled to be inserted between the outer peripheral surface and the inner peripheral surface of the mold in the direction from the outer peripheral surface to the inner peripheral surface of the mold, and the upper fixing part is coupled to be seated on the outer peripheral surface of the mold.
Manufacturing method of concrete electric poles. In order to be able to combine with the step bolt installed on the outer peripheral surface of the concrete electric pole, a method of manufacturing a concrete electric pole using a step nut installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole,
Preparing a mold in which a pouring space for mortar pouring is formed;
Preparing a step nut assembly including a temporary step bolt for fixing the step nut by combining with the step nut, and the step nut having a groove formed in the longitudinal direction to be coupled to the temporary step bolt;
Installing a step nut assembly in which the step nut coupled with the temporary step bolt penetrates the mold and is placed in the pouring space;
A mortar pouring step of injecting mortar into the pouring space of the mold; and
After the mortar is cured, it includes a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete,
The step of preparing the mold is,
forming a step nut installation hole in the mold at a position where the step nut is installed so that the step nut coupled with the temporary step bolt can easily penetrate the mold; and
In order to arrange the step nut to be fixed to the pouring space by fixing the temporary step bolt when the step nut coupled with the temporary step bolt penetrates the step nut installation hole, the step is installed in the mold. It includes the step of installing a step bolt fixture at a position where a hole for installing a nut is formed,
In the step of installing the step nut assembly,
The step nut coupled with the step bolt for temporary use is disposed in the pouring space through the step bolt fixing part and the hole for installing the step nut, and the step bolt for temporary use is coupled with and fixed to the step bolt fixing part,
Before or after installing the step nut assembly,
PC steel rods extending in a circumferential direction are arranged to be spaced apart from each other in the circumferential direction to correspond to a portion extending a set length from the bottom to the top along the longitudinal direction of the concrete electric pole, and correspond to a portion extending along the longitudinal direction of the concrete electric pole. The guide wires extending as much as possible are arranged to be spaced apart in the circumferential direction so as not to interfere with the PC steel bars, and are extended to correspond to a portion extending along the longitudinal direction of the concrete electric pole, and the PC steel bars and the guide wires are A steel assembly installation step of preparing a steel assembly to form a steel assembly by arranging spiral reinforcing bars to be coupled and fixed, and installing the steel assembly in a mold; and
It further includes a PC steel wire installation step of inserting PC steel wires extending in the longitudinal direction to correspond to the concrete electric poles into the steel assembly installed in the mold, arranging them to be spaced apart from the spiral reinforcing bars, and installing them to be fixed. doing,
Manufacturing method of concrete electric poles. In claim 2,
The step bolt fixing part,
a lower fixing part having a first hollow formed therein and coupled to the mold so that the first hollow communicates with the pouring space; and
It extends integrally upward from the upper part of the lower fixing part, and has a second hollow formed therein that communicates with the first hollow. The second hollow has a larger diameter than the first hollow, so that the lower part An upper fixing part having a step formed at a part connected to the fixing part and having a screw thread formed on the inner peripheral surface of the second hollow,
In the step of installing the step bolt fixing part,
The lower fixing part is coupled to be inserted between the outer peripheral surface and the inner peripheral surface of the mold in the direction from the outer peripheral surface to the inner peripheral surface of the mold, and the upper fixing part is coupled to be seated on the outer peripheral surface of the mold.
Manufacturing method of concrete electric poles... In claim 1 or 3,
The temporary step bolt is,
A nut coupling portion extending in the longitudinal direction of the temporary step bolt and having a thread formed on the outer peripheral surface;
One side in the longitudinal direction is integrally connected to the extended end of the nut coupling part, extends in the longitudinal direction, and has a larger diameter than the nut coupling part, so that it intersects the longitudinal direction than the nut coupling part. a first central protrusion that protrudes further in the direction;
One side in the longitudinal direction is integrally connected to the other extended side of the first central protrusion, extends in the longitudinal direction, and has a diameter larger than the first central protrusion, so that the first central protrusion has a larger diameter than the first central protrusion. A second central protrusion further protrudes in a direction intersecting the longitudinal direction and has a screw thread formed on the outer peripheral surface; and
One side in the longitudinal direction is integrally connected to the other extended side of the second central protrusion, and includes a bolt head portion extending in the longitudinal direction,
The step of installing the step nut assembly is,
The nut coupling part to which the step nut is coupled sequentially penetrates the upper and lower fixing parts of the step bolt fixing part to be disposed in the pouring space, and the first center protrusion penetrates the upper fixing part. It is disposed in the first hollow of the lower fixing part, and the second central protrusion is screwed to a screw thread formed on the inner peripheral surface of the second hollow and the lower surface is formed between the lower fixing part and the upper fixing part. Including the step of installing a step bolt that is coupled to be seated on the stepped portion,
Manufacturing method of concrete electric poles. In claim 1 or 2,
Further comprising the step of installing a steel assembly that serves as a tension member in the concrete electric pole in the mold,
Preparing the mold, installing the steel assembly, preparing the step nut assembly, and installing the step nut assembly are performed sequentially, or preparing the mold and installing the step nut assembly. The steps of preparing, installing the step nut assembly, and installing the steel assembly are performed sequentially,
Manufacturing method of concrete electric poles. In order to be able to combine with the step bolt installed on the outer peripheral surface of the concrete electric pole, a method of manufacturing a concrete electric pole using a step nut installed to be embedded in the concrete electric pole when manufacturing the concrete electric pole,
Preparing a mold in which a pouring space for mortar pouring is formed;
Installing a reinforcing bar assembly that serves as a tension member in the concrete electric pole in the mold;
A mortar pouring step of injecting mortar into the pouring space of the mold;
A reinforcing bar assembly tensioning step of tensioning the reinforcing bar assembly by applying a tensile force to the reinforcing bar assembly;
Prepare a step nut assembly including a temporary step bolt for fixing the step nut by combining with the step nut and the step nut having a groove formed in the longitudinal direction to be coupled to the temporary step bolt, Installing a step nut assembly in which the step nut coupled with the step bolt penetrates the mold and is placed in the pouring space;
After the mortar is cured, it includes a step bolt separation step of separating and removing the temporary step bolt from the step nut while the step nut is fixed to the concrete,
The step of preparing the mold is,
Forming a step nut installation hole in the mold at a position where the step nut is installed so that the temporary step bolt can easily penetrate the mold; and
When the step nut coupled with the temporary step bolt penetrates the step nut installation hole, the step nut installation hole is formed in the mold to fix the step nut by fixing the temporary step bolt. Including installing the step bolt fixture in position,
In the step of installing the step nut assembly,
The step nut coupled with the temporary step bolt is disposed in the pouring space through the step bolt fixing part and the step nut installation hole, and the temporary step bolt is coupled with the step bolt fixing part and fixed,
The step bolt fixing part,
a lower fixing part having a first hollow formed therein and coupled to the mold so that the first hollow communicates with the pouring space; and
It extends integrally upward from the upper part of the lower fixing part, and has a second hollow formed therein that communicates with the first hollow, and the second hollow has a larger diameter than the first hollow, so that the lower part An upper fixing part having a step formed at a part connected to the fixing part and having a screw thread formed on the inner peripheral surface of the second hollow,
In the step of installing the step bolt fixture,
The lower fixing part is coupled to be inserted between the outer peripheral surface and the inner peripheral surface of the mold in the direction from the outer peripheral surface to the inner peripheral surface of the mold, and the upper fixing part is coupled to be seated on the outer peripheral surface of the mold.
Manufacturing method of concrete electric poles. In the step nut assembly used to embed the step nut in the concrete electric pole to conveniently install the step bolt on the outer peripheral surface of the concrete electric pole,
When manufacturing a concrete electric pole, a mold is formed in which a pouring space for mortar pouring is formed and a step nut installation hole is formed at a position to install the step nut, and is installed at a position in the mold where the step nut installation hole is formed. A temporary step bolt fixed by combining with a step bolt fixing part; and
A groove is formed in the longitudinal direction to be coupled to the temporary step bolt, and in a state coupled to the temporary step bolt, the step is arranged to be fixed to the pouring space through the step nut installation hole and the step bolt fixing part. Contains nuts,
The temporary step bolt to which the step nut is coupled,
Before the reinforcing bar assembly is placed in the mold, it is coupled and fixed to the step bolt fixing part, or after the reinforcing bar assembly is placed in the mold and before mortar is poured, it is coupled and fixed to the step bolt fixing part, or the reinforcing bar assembly is fixed to the step bolt fixing part. Mortar is poured into the arranged mold and the reinforcing bar assembly arranged in the mold is tensioned and then coupled to and fixed to the step bolt fixing part. When the mortar is cured and the step nut is fixed by the mortar, the step nut is separated from and removed,
The step bolt fixing part,
a lower fixing part having a first hollow formed therein and coupled to the mold so that the first hollow communicates with the pouring space; and
It extends integrally upward from the upper part of the lower fixing part, and has a second hollow formed therein that communicates with the first hollow. The second hollow has a larger diameter than the first hollow, so that the lower part A stepped portion is formed at a portion connected to the fixing portion, and an upper fixing portion having a screw thread formed on the inner peripheral surface of the second hollow,
The step bolt fixing part,
The lower fixing part is coupled to be inserted between the outer peripheral surface and the inner peripheral surface of the mold in the direction from the outer peripheral surface to the inner peripheral surface of the mold, and the upper fixing part is arranged to be seated on the outer peripheral surface of the mold.
Step nut assembly. delete In claim 7,
The temporary step bolt is,
A nut coupling portion extending in the longitudinal direction of the temporary step bolt and having a thread formed on the outer peripheral surface;
One side in the longitudinal direction is integrally connected to the extended end of the nut coupling part, extends in the longitudinal direction, and has a larger diameter than the nut coupling part, so that it intersects the longitudinal direction than the nut coupling part. a first central protrusion that protrudes further in the direction;
One side in the longitudinal direction is integrally connected to the other extended side of the first central protrusion, extends in the longitudinal direction, and has a diameter larger than the first central protrusion, so that the first central protrusion has a larger diameter than the first central protrusion. A second central protrusion further protrudes in a direction intersecting the longitudinal direction and has a screw thread formed on the outer peripheral surface; and
One side in the longitudinal direction is integrally connected to the other extended side of the second central protrusion, and includes a bolt head portion extending in the longitudinal direction,
The nut coupling part to which the step nut is coupled is disposed in the pouring space by sequentially penetrating the upper and lower fixing parts of the step bolt fixing part, and the first central protrusion penetrates the upper fixing part and It is disposed in the first hollow of the lower fixing part, and the second central protrusion is screwed with a screw thread formed on the inner peripheral surface of the second hollow so that the lower surface has a step formed between the lower fixing part and the upper fixing part. Combined to be seated on the part,
Step nut assembly.

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