JP6479554B2 - Branch line anchor and construction method of branch line anchor - Google Patents

Description

  The present invention relates to a branch anchor that supports a branch line provided on a utility pole on the ground, and a method for constructing the branch anchor.

  Conventionally, there has been provided a branch anchor that connects a branch line to the utility pole and supports the branch line on the ground in order to prevent the utility pole standing on the ground from falling down.

  Such branch anchor construction methods can be broadly classified into two types: a driving method and an embedding method. That is, as described in Patent Document 1, a driving-type branch anchor has a resistance plate driven into the ground by a driving method, and this resistance plate is connected to a branch line from a utility pole through a member such as a guide plate. It is to be connected to.

  In addition, as described in Patent Document 2, the branching type anchor is composed of a resistance block and a branching bar, and after the resistance plate is embedded in a buried hole excavated in the ground, It connects with the branch line for electric poles through a rod.

  In such construction methods, the anchor anchors for driving-in systems require less labor for laying resistance plates, etc., and the construction time is short, but in urban areas, water pipes, gas pipes, communication lines, etc. are buried. There is an inconvenience of causing damage to things.

  Moreover, in the case of a buried branch anchor, it is necessary to excavate to a depth of about 1.5 m, which has the disadvantage that the laying labor is large and the construction time is long. Furthermore, although a large area is required for the danger due to the collapse of the excavation hole and the excavation work, it is possible to avoid damage to the buried object by manually excavating the excavation hole.

  By the way, in recent years, when building utility poles in urban areas, damage to buried objects during construction becomes a major social problem, so check whether there are buried objects using test moats and probes before construction of branch anchors. There are rules.

  Therefore, when conducting a test excavation as a pre-construction when building a utility pole, extensive excavation work and backfilling of excavated soil are required, and the ground after backfilling is a disturbed excavation backfill ground. As a result, there arises a problem that the ground strength decreases.

No. 7-30746 JP-A-2005-207224

  As described above, when constructing a driving-type branch anchor in an urban area or the like in an urban area, it is necessary to confirm in advance by a test moat or a probe in order to avoid damage to buried objects. However, since the anchor anchor of the driving method is a structure that demonstrates anchor performance such as ground strength when driven into the ground, the excavated soil by the test moat is backfilled in order to demonstrate this anchor performance. After that, construction of branch anchors that function under new construction conditions is required.

  The present invention has been made in view of the above circumstances, and is a branch anchor that supports a branch line that prevents the collapse of a utility pole on the ground, and is the minimum range of test holes that have been excavated to investigate the presence of buried objects. Is used as a buried hole for a branch anchor, thereby shortening the working time and labor, and improving the efficiency of the probe work and providing the necessary anchor performance. The purpose is to provide an anchor construction method.

  In order to achieve the above object, the branch anchor of claim 1 of the present invention is placed on the bottom surface of a test hole drilled in order to investigate the presence or absence of an embedded object as a preliminary work for embedding the branch anchor of a utility pole. The buried body that is subjected to the overburden pressure by the excavated soil that has been backfilled in the state, and after investigating the presence or absence of the buried object by probe inspection from the bottom surface of the test burrow to the depth of insertion of the resistor, And a connecting member for connecting the branch line, and a buried member, a resistor, and a connecting member for connecting the branch line are combined. It is characterized by that.

  Moreover, the construction method of the branch anchor according to claim 2 of the present invention excavates a test hole for investigating the presence or absence of an embedded object as a preliminary work for embedding the branch anchor of a utility pole, and resistance from the bottom surface of the test hole. After investigating the presence or absence of buried objects up to the depth at which the body is to be implanted, a buried body placed on the bottom surface of the test hole, a resistor to be driven into the ground from the bottom surface of the test hole, and a utility pole The resistance of the branch anchor consisting of the connecting member for connecting the provided branch line is driven into the probe inspection range from the bottom surface of the test hole, and the buried body is placed on the bottom surface of the test hole. It is characterized by refilling excavated soil in the hole.

  The present invention enables construction of a branch anchor on the premise of excavation work for confirmation of buried objects, and is a minimum range for investigating the presence of buried objects as a preliminary work for embedding branch anchors of utility poles. By excavating the test hole, it is possible to confirm the presence or absence of an embedded object within the range of the test hole. Since such excavation work is performed to the depth to the buried anchor of the branch anchor, the excavation depth of the test hole is shallow compared with the conventional construction method of the embedding method, and the work time is reduced accordingly. In addition, the work labor can be reduced.

  In addition, after excavating the test hole as described above, a probe bar is used for investigating whether there is an embedded object from the bottom surface of the test hole to the depth at which the resistor is driven by probe inspection. The depth at which the probe inspection is performed in the present invention is from the bottom surface of the test pit to the depth at which the resistor is driven. Therefore, by setting the driving depth of the resistor to a range of 50 to 60 cm, Highly accurate and efficient investigation of buried objects becomes possible.

  Further, according to the present invention, since the resistor driving range is an undisturbed ground, the resistor driven into the ground can exhibit the ground strength using the side earth pressure applied to the resistor. It becomes possible. On the other hand, since the buried body receives the overburden pressure by the excavated soil backfilled in the test hole while being placed on the bottom surface of the test hole, the buried body, the resistor, and the connecting member are combined. This branch anchor can exhibit effective ground strength both in the upward direction and the lateral direction in the ground.

  As mentioned above, the present invention is a construction method in which a branch anchor is installed using a test digging for investigating the presence or absence of buried objects and a resistor is driven from the bottom of the test burrow. This makes it possible to carry out test digging, probe inspection, and simultaneous construction of branch anchors. Further, when removing the branch anchor, the resistance body can be easily pulled out by removing the depth of the buried body.

It is a side view which shows the state which excavated soil in the test pit hole in the state which driven the resistor of the branch anchor in the Example of this invention from the bottom face of the test pit. (A) And (b) is the perspective view which looked at the branch anchor in the Example of this invention from the different direction. It is a figure which shows the buried object which comprises the branch anchor in the Example of this invention, (a) is a side view, (b) is an end view, (c) is a top view. It is a figure which shows the resistor which comprises the branch anchor in the Example of this invention, (a) is a top view, (b) is the side view which looked at the resistance board from the front side, (c) is a side view of the resistance reinforcement board It is the side view seen from the side. (A) is a top view which shows the state which couple | bonded the buried object and resistor which comprise the branch anchor in the Example of this invention, (b) is a side view of (a), (c) is buried. It is the side view which combined the lower end part of the connection member with the reinforcement board. BRIEF DESCRIPTION OF THE DRAWINGS It is a construction drawing of the branch anchor in the Example of this invention, (a) shows the state which excavated the test digging hole in the ground, (b) is before driving the resistor of the branch anchor from the bottom of the test digging hole. The state is shown, and (c) is a view showing a state in which excavated soil is backfilled in the test hole after the resistor of the branch anchor is driven from the bottom surface of the test hole.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the branch anchor of this embodiment is a bottom surface of a test borehole H excavated to investigate the presence of an embedded object (not shown) as a preliminary work for embedding a branch anchor 1 of a utility pole (not shown). Embedding body 2 receiving the overburden pressure with excavated soil D backfilled in test borehole H in the state of being placed on B, and buried by probe inspection from the bottom surface B of test borehole H to the driving depth of resistor 3 After investigating the presence or absence of an object, it has a resistor 3 that receives lateral earth pressure by being driven into the ground from the bottom surface B of the test hole H, and connects the buried body 2, the resistor 3, and the branch line 4. Therefore, the connecting member 5 is connected to the connecting member 5.

  Hereinafter, the branch anchor 1 having such a structure will be described in detail. As shown in FIGS. 2A and 2B, the branch anchor 1 has a configuration in which an embedded body 2, a resistor 3, and a connecting member 5 are coupled.

  In such a configuration, as shown in FIGS. 3A to 3C, the embedded body 2 includes an embedded plate 6 and an embedded reinforcing plate 7 fixed perpendicularly to the upper surface of the embedded plate 6. A bolt hole 7b is formed in the driving portion 7a formed to protrude from one side of the embedded reinforcing plate 7. Further, a concave driving receiving portion 7c is formed on the upper portion of the driving portion 7a.

  On the other hand, as shown in FIGS. 4A to 4C, the resistor 3 includes a resistor plate 8 and a resistance reinforcing plate 9, and the resistor plate 8 extends in an inclined manner from the end of the upper plate portion 8a. The resistance plate portion 8b is formed. The lower end of the resistance plate portion 8b is formed in a sharp shape, and the resistance reinforcing plate 9 is fixed along the center on the back side of the gradient surface of the resistance plate portion 8b.

  The resistance reinforcing plate 9 is formed so that the width becomes narrower as it goes below the resistance plate portion 8b. The upper end of the resistance reinforcing plate 9 is fixed to the upper plate portion 8a, and the resistance reinforcing plate 9 is inclined. Are fixed to the resistance plate portion 8b.

  Further, as shown in FIGS. 2A and 2B, the connecting member 5 is a long flat plate and has connecting holes 5a and 5b (see FIG. 1 or FIG. 5C) formed at both ends. Yes.

  In the branch anchor 1 configured as described above, as shown in FIGS. 5A to 5C, the upper plate portion 8a of the resistance plate 8 and the embedded plate 6 are connected by bolts, rivets, welding, or the like (not shown). The bolt 10 is inserted into the bolt hole 7b formed in the driving portion 7a of the embedded reinforcing plate 7 and the connecting hole 5a of the connecting member 5 and fastened with the nut 11 to fix the embedded body 2 and the resistance. The body 3 and the connecting member 5 are combined. Such a branch anchor 1 may be driven from the bottom surface B of the test hole H in a state where the buried body 2, the resistor 3, and the connecting member 5 are connected in advance, or in the test hole H during the driving operation. The embedded body 2, the resistor 3, and the connecting member 5 may be coupled by a bolt.

  Next, in order to construct the branch anchor 1 configured as described above, as shown in FIG. 6 (a), a preliminary work for embedding a branch anchor 1 (see FIG. 6 (c)) of an unillustrated utility pole. A test hole H for investigating the presence or absence of buried objects (not shown) is manually excavated in the ground G and visually confirmed that there are no buried objects. Investigate whether or not there is a buried object up to the depth at which 3 is inserted.

  After that, as shown in FIG. 6 (b), the resistor 3 of the branch anchor 1 formed by integrally connecting the buried body 2, the resistor 3, and the connecting member 5 as described above is connected to the bottom surface of the test hole H. Drive in from the corner of B to the range of probe inspection. The driving operation of the resistor 3 is performed by using a driving receiving portion 7c formed on the driving portion 7a of the embedded reinforcing plate 7 and hitting a driving tool (not shown) on the driving receiving portion 7c. To. Then, as shown in FIG. 6C, when the embedded plate 6 contacts the bottom surface B of the test digging hole H, the driving operation of the resistor 3 is stopped, and then the connecting hole 5b at the upper end of the connecting member 5 is removed. It connects with the branch line 4 provided in the utility pole direction. In addition, at this time, it is good to scrape off the narrow branch line groove C in the oblique direction through which the connecting member 5 and the branch line 4 pass at the side of the test hole H.

  Next, as shown in FIG. 6 (c), the excavated soil D is buried in the test hole H in a state where the embedded plate 6 of the branch anchor 1 is placed on the bottom surface B of the test hole H. This backfilling is performed by dividing the depth of the test pit H into a plurality of layers, and the backfilled soil is preferably solidified by rolling for each layer of the backfilled soil.

  When removing the branch anchor 1, it is possible to easily remove the resistor 3 by performing a test digging to the depth of the buried body 2.

  In the above construction method, the depth of the test hole H excavated to confirm the presence of the buried object is 1.0 m, and the depth of the probe inspection performed from the bottom surface B of the test hole H is 0.5 m. By doing so, it becomes possible to lay the resistor 3 of the branch anchor 1 to a total depth of 1.5 m. Further, when the depth of the test hole H is 1.0 m, it becomes 0.5 m less than the conventional embedding method, which is useful for reducing the labor of test digging work by hand and shortening the work time. .

  In addition, since the depth of the probe inspection performed from the bottom surface B of the test hole H is 0.5 m, highly accurate and efficient probe inspection using a conventional probe bar is possible.

  Furthermore, since the driving range of the resistor 3 driven from the bottom surface B of the test hole H is a normal ground that has not been excavated, the resistor 3 driven into the ground is a side surface applied to the resistance plate 8. It is possible to demonstrate the soil strength using earth pressure. On the other hand, since the buried body 2 receives the overburden pressure by the excavated soil buried in the test hole H in a state of being placed on the bottom surface B of the test hole H, the branch anchor 1 of this embodiment is It is possible to exhibit effective earth bearing strength in both the upward direction and the lateral direction.

  The branch anchor and the method for constructing the branch anchor of the present invention are branch anchors that support a branch line to prevent the collapse of a utility pole on the ground, and the branch line of the smallest range drilled to investigate the presence of buried objects By using it as an anchor burial hole, it is possible to shorten the work time and work labor, improve the efficiency of the probe work, and achieve the necessary anchor performance. It can be used as a construction method.

DESCRIPTION OF SYMBOLS 1 Branch line anchor 2 Embedded body 3 Resistor 4 Branch line 5 Connection member 5a, 5b Connection hole 6 Embedded board 7 Embedded reinforcement board 7a Driving part 7b Bolt hole 7c Driving receiving part 8 Resistance board 8a Upper board part 8b Resistance board part 9 Resistance reinforcement plate 10 Bolt 11 Nut B Bottom C Branch line D Excavated soil G Ground H Test borehole

Claims (2)

As a preliminary work to bury the anchor anchor of the utility pole, the buried body that receives the overburden pressure by the excavated soil that has been backfilled in the state of being placed on the bottom of the test borehole excavated to investigate the presence of buried objects, and the test excavation For connecting the branch line to the resistor that receives side earth pressure by investing into the ground from the bottom of the test digging hole after investigating the presence or absence of the buried object from the bottom of the hole to the implantation depth of the resistor A branch line anchor having a connecting member and having a structure in which an embedded body, a resistor, and a connecting member for connecting a branch line are combined. In order to investigate the presence of buried objects as a preliminary work for burying the anchor anchors of utility poles, a test digging hole is drilled and the presence of buried objects from the bottom of the testing digging hole to the depth at which the resistor is driven is probed. After the investigation, a branch anchor comprised of a buried body placed on the bottom surface of the test hole, a resistor driven into the ground from the bottom surface of the test hole, and a connecting member for connecting the branch line provided on the utility pole Construction of a branch anchor, characterized in that the resistor is driven into the probe inspection area from the bottom of the test hole, and the buried body is placed on the bottom of the test hole, and the soil is backfilled in the test hole Method.