JP5500431B2 - Basic steel pipe settlement prevention structure - Google Patents

Description

  The present invention relates to a foundation steel pipe settlement prevention structure capable of preventing settlement of a foundation steel pipe even when the ground is soft geology when a lower part of a pole body such as a power pole is inserted and fixed to the foundation steel pipe buried in the ground.

  Conventionally, foundation steel pipes have been buried in a predetermined ground, and these pillar bodies have been built by inserting and fixing pillars such as electric poles, street lights or signal lights inside the foundation steel pipe. ing. At this time, in order to embed the foundation steel pipe in the ground, the foundation steel pipe using an earth auger is rotationally press-fitted, and the above-mentioned pillar body is inserted and a solidifying agent such as ready-mixed concrete is introduced, thereby introducing the foundation steel pipe. And the column are joined together.

  By the way, when embedding such a basic steel pipe in soft ground, the ground supporting force is small, so that the column body sinks or tilts. Therefore, when embedding the foundation steel pipe in the soft ground, it is particularly important to prevent the settlement of the foundation steel pipe.

  Here, a conventional technique is referred to as a means for preventing settlement of a pole body such as a utility pole. The invention of Patent Document 1 is referred to as “rotary press-fitting pile for soft ground”. Its configuration is to provide an outward flange at the lower end of the pile body, and to provide ground excavation nails at multiple locations on the outer periphery of this flange, and to prevent settlement that has a downward slope toward the rotation direction of the pile on the left and right outside of the pile body A plurality of pairs of blades are provided at different levels.

  In such a configuration, the flange provided at the lower end of the pile body is at the tip of the resistor and receives the earth pressure when the pile body is rotationally pressed into the ground at the flange surface, so the pile body enters the ground. When doing so, a large rotational force is required. In addition, in order to obtain the design ground support force, it is necessary to grasp the ground strength at the tip of the pile in advance, but when installation in the same ground is limited, such as utility poles and street lights, the ground at the tip of the pile is limited. The survey is difficult to apply including the cost. Furthermore, since the subsidence prevention blades are provided on the outer periphery of the pile body, if the rotation cannot be spirally inserted into the ground, the ground around the foundation is loosened, and the column body is easily inclined.

  On the other hand, the invention “Method of preventing settlement of electric pole and apparatus thereof” of Patent Document 2 has a structure in which a resistance plate and a storage cylinder are engaged, and the storage cylinder is placed on the ground surface of the power pole embedded in the ground. And a utility pole are integrally coupled via a wedge. Further, as a specific structure thereof, the resistance plate is a rectangular steel plate, and is provided on the ground surface after embedding the electric pole. Therefore, the resistance plate does not hinder the embedding of the electric pole. In addition, the resistance plate of Patent Document 2 has a shallow depth to obtain the ground supporting force compared to Patent Document 1, so that it is easy to measure the ground strength of the resistance plate installation surface in advance, and the effect of preventing settlement is obtained. It is possible to exert it effectively.

  By the way, the structure described in Patent Document 2 requires a coupling pipe for coupling two resistance plates, a large number of U bolts, and the like, and further includes a storage cylinder and a wedge for coupling the resistance plate to the utility pole. Since it is necessary, the structure is somewhat complicated, and it takes time and labor for construction. For this reason, it has been desired to improve the resistance plate so that the resistance plate can be prevented from sinking with a simpler structure.

Japanese Patent Laid-Open No. 9-195271 Japanese Examined Patent Publication No. 63-16533

  The present invention has been made in view of the above circumstances, and in order to prevent the settlement of pillars such as utility poles built on soft ground, the settlement of foundation steel pipes used when burying this pillar is prevented. An object of the present invention is to provide a structure for preventing settlement of a basic steel pipe that realizes simplification of construction and cost reduction by improving the structure so as to make the structure simpler.

In order to achieve the above object, the foundation steel pipe settlement prevention structure according to claim 1 according to the present invention embeds a foundation steel pipe provided with a plurality of claws on the outer periphery of the lower part thereof in a soft ground by rotational press-fitting from above. In the steel pipe subsidence prevention structure that prevents the subsidence of the base steel pipe and column by fixing the subsidence prevention plate to the base steel pipe when the lower part of the column is inserted and fixed inside the steel pipe, Form a ridge that protrudes to the outer periphery near the upper end of the tube, and the subsidence prevention plate is separated from the subsidence prevention plate at a position that divides the fitting hole formed to fit the basic steel pipe into a semicircular shape. A circumferential reinforcing frame having a divided structure to be divided and provided with a reinforcing frame in the semicircular hole and outer periphery of the divided subsidence prevention plate, and formed by joining these divided antisag plates Multiple holes are formed on the outer periphery of , Surrounds the outer periphery exposed on the ground foundation steel pipe in the self-supporting state of being buried halfway basic steel pipe ground in a semi-circular hole of subsidence prevention plate split state, the reinforcement of the opposite cell sides subsidence prevention plate split state By injecting a filler into a plurality of holes formed in the subsidence prevention plate in a state in which the flange of the basic steel pipe that is rotationally press-fitted into the ground is mounted on the circumferential reinforcing frame formed by joining the frames , It is characterized in that the bottom surface of the settlement subsidence plate and the ground of the outer periphery of the foundation steel pipe are reinforced and the foundation steel pipe and the settlement settlement plate are combined.

  As described above, the foundation steel pipe settlement prevention structure of the present invention is provided with a flange on the outer periphery in the vicinity of the upper end of the foundation steel pipe, the settlement prevention plate is a divided structure, and the semicircular holes of both division shaped settlement prevention plates. Is fitted to the outer periphery of the basic steel pipe, and the divided anti-sag plates are joined together to form a large area anti-sag plate. Therefore, the basic steel pipe settlement prevention structure of the present invention can obtain an efficient settlement prevention effect at a low cost with a very simple structure.

  Moreover, at the time of construction of the foundation steel pipe settlement prevention structure of this invention, it is set as the self-supporting state which was laid up to the middle of the foundation steel pipe. Next, the outer circumference exposed to the ground of the basic steel pipe is surrounded by a semicircular hole of the divided state settlement prevention plate, and the circumferential shape formed by joining the reinforcing frames on the opposite sides of the divided state settlement prevention plate It is possible to complete the construction of the foundation steel pipe and the installation of the subsidence prevention plate by placing the foundation steel pipe spear rotated and pressed into the ground on the reinforcement frame and injecting the filler from the hole of the subsidence prevention plate. It becomes. Therefore, even if the place where the pole body such as the electric pole is to be built is soft ground, it is possible to assemble and install the settlement prevention plate by a simple method at the site.

  In addition, when the foundation steel pipe settlement prevention structure of the present invention is applied, since the depth to obtain the ground supporting force is shallow, the ground strength can be easily measured and the size of the settlement prevention plate can be appropriately set. Become. Therefore, it is possible to provide an easy and reliable settlement prevention measure in accordance with the ground state of the place where the pole body such as the electric pole should be built.

  Moreover, in such a foundation steel pipe settlement prevention structure, without providing a separate means for connecting the foundation steel pipe and the settlement prevention plate, a structure in which the foundation steel pipe flange is mounted on the circumferential reinforcement frame of the settlement prevention plate, Since the weight of the base steel pipe acts as a load from above the sinking prevention plate, and the base steel pipe and the sinking prevention plate are connected to each other, this is extremely useful for simplifying the structure.

It is a whole perspective view of the basic steel pipe settlement prevention structure by this invention, (a) shows the state which divided | segmented the settlement prevention board, (b) shows the state which combined the settlement prevention board integrally. (A), (b) is a side view which shows the condition where the foundation steel pipe settlement prevention structure by this invention was embed | buried under the ground. It is a top view which shows the resistance board which concerns on the basic steel pipe settlement prevention structure by this invention. (A)-(f) is a figure which shows the construction process of the basic steel pipe settlement prevention structure by this invention, and shows the process until the completion of the pillar construction of a pillar body from the floor digging of the ground.

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

  In the embodiment according to the present invention, as shown in FIGS. 1 (a) and 1 (b), a basic steel pipe 1 provided with a plurality of claws 2, 2... Is embedded in the ground by rotational press-fitting from above. When the lower part of the column 4 (see FIG. 2) is inserted into the basic steel pipe 1 and fixed with a fixing agent such as ready-mixed concrete, the foundation steel pipe 1 and the column are fixed by fixing the subsidence prevention plate 3 to the basic steel pipe 1. This structure constitutes a foundation steel pipe settlement prevention structure that prevents the body 4 from sinking.

  The basic steel pipe 1 used in the above-mentioned basic steel pipe settlement prevention structure is composed of a cylindrical steel pipe body 5 having a predetermined length of, for example, 2.5 m to 5.0 m, near the upper end of the pipe body 5. A disk-shaped ridge 6 projecting to the outer periphery is fixed. Note that, as shown in FIGS. 1A and 1B, the flange 6 can be reinforced by a plurality of ribs 7 provided at intervals on the outer periphery near the upper end of the basic steel pipe 1. Further, as shown in FIG. 3, for example, with respect to a column body 4 such as a power pole having a diameter of 350 mm, when the basic steel pipe 1 has a diameter of about 500 mm and the column body 4 is inserted into the basic steel pipe 1, The column 4 is fixed in the basic steel pipe 1 by pouring the ready-mixed concrete 8 into the surrounding voids.

  Further, as shown in FIGS. 2A and 2B, the column body 4 is moved in the lateral direction in the basic steel pipe 1 to avoid the obstacles around the column body 4. it can. Moreover, the column body 4 can be fixed at a predetermined position by pouring the ready-mixed concrete 8 into a space around the column body 4 in the basic steel pipe 1.

  As shown in FIG. 1B, the rod 6 fixed near the upper end of the foundation steel pipe 1 transmits a vertical load to the settlement prevention plate 3. Further, a plurality of claws 2, 2... Are fixed to the outer periphery of the lower end of the basic steel pipe 1 with a gap protruding downward.

  Furthermore, as shown to Fig.1 (a), (b), a pair of rotary plate 12 is being fixed to the upper end of said basic steel pipe 1 at two places of a diametrical direction. A rotary tool 13 (see FIG. 4B) is fitted into the round hole 12b formed in the rotary plate 12, and the earth auger rotary device 10 is locked in a center hole (not shown) formed in the rotary tool 13. By doing so, the rotary press-fitting of the basic steel pipe 1 becomes possible. Therefore, when the foundation steel pipe 1 is rotationally press-fitted into the ground, it is rotated by the earth auger rotating device 10 via the rotary tool 13 attached to the upper end of the foundation steel pipe 1 as shown in FIG. When pressed, the plurality of claws 2, 2... Can cause the foundation steel pipe 1 to enter downward while excavating the soil.

  Further, as shown in FIGS. 2A, 2B, or 3, the rotary tool 13 is removed from the rotary plate 12 of the basic steel pipe 1, and the concave portions 12a of the pair of rotary plates 12 (FIG. It is possible to attach the column base 14 to the upper part of the inner cavity of the basic steel pipe 1 by hooking a hanging plate 14c provided at the upper end of the column base 14 to be described later on (see a) and (b)). It becomes.

  On the other hand, as shown in FIG. 1A, the settlement prevention plate 3 of this embodiment is a settlement prevention plate at a position where the fitting hole 9 formed for fitting the basic steel pipe 1 is divided into a semicircular shape. It has a split structure that splits 3 into separate bodies. That is, as shown in FIG. 1 (b), the anti-sag plate 3 in an integrally coupled state is formed with a circular fitting hole 9 through which the basic steel pipe 1 is inserted, as shown in FIG. 1 (a). When the subsidence prevention plate 3 is divided, the divided subsidence prevention plate 3 (hereinafter referred to as “divided subsidence prevention plates 3a and 3b”) has semicircular holes 9a and 9b (see FIG. 3) on the sides facing each other. It will be in the formed state.

  In each of such divided settlement prevention plates 3a and 3b, semicircular holes 9a and 9b and a reinforcing frame 16 are provided on the outer periphery. Further, by joining these divided subsidence prevention plates 3a and 3b, a circumferential frame 17 composed of a frame of semicircular holes 9a and 9b is formed. Further, a plurality of holes 18 are formed on the outer periphery of the circumferential frame 17, and as shown in FIG. 1 (b), the bottom surface of the subsidence prevention plate 3 is injected by injecting a filler 19 into the holes 18. And it becomes possible to reinforce the ground of the outer peripheral part of the foundation steel pipe 1.

  Further, as shown in FIG. 1 (a), each of the divided subsidence prevention plates 3a, 3b has a plurality of positions of reinforcing frames 16c, 16c provided on both sides of the pair of semicircular holes 9a, 9b (see FIG. 3). Bolt holes 20 are formed in the upper part. Therefore, as shown in FIG. 1 (b), both the divided subsidence prevention plates 3a, 3b are fitted into the semicircular holes 9a, 9b of both the divided subsidence prevention plates 3a, 3b. The divided subsidence prevention plates 3a and 3b can be integrally joined by matching the reinforcing frames 16c and 16c of 3b facing each other, inserting bolts 21 into the respective bolt holes 20 and fastening them with nuts 22. .

  The basic steel pipe 1 fitted in the fitting hole 9 inside the circumferential reinforcing frame 17 of the anti-sag plate 3 thus formed integrally is slidable with respect to the fitting hole 9. Therefore, as shown in FIG. 1 (b), when the basic steel pipe 1 is moved downward along the fitting hole 9, the flange 6 of the basic steel pipe 1 is moved to the upper end of the circumferential reinforcing frame 17 of the subsidence prevention plate 3. Stops in a state where it is placed. Therefore, in such a structure, the weight of the base steel pipe 1 acts as a load from above the subsidence prevention plate 3 without providing a separate means for connecting the base steel pipe 1 and the subsidence prevention plate 3. 1 and the settlement prevention plate 3 are fixed.

  As shown in FIG. 3, the divided subsidence prevention plates 3a and 3b formed by dividing the subsidence prevention plate 3 do not necessarily have an equal area, depending on the ground conditions and surrounding obstacles. It is also possible to form in an area that is biased to any one. In this case, as shown in FIG. 3, the reinforcing frame provided inside each of the divided subsidence prevention plates 3a and 3b is angled so as to be perpendicular to the opposite side from the left and right equal centers of the circumferential reinforcing frame 17. You may comprise by welding the material 16a.

  Depending on the ground supporting force, it is also possible to provide a bolt hole 20 in the reinforcing frame 16 so that two divided subsidence prevention plates 3a can be incorporated, and to connect them with bolts and nuts.

  2 (a) and 2 (b) includes a left and right long metal strips 14a and 14a, a column base 14b fixed to the lower ends of the left and right metal strips 14a and 14a, It is made up of hanging plates 14c and 14c formed in an L shape fixed to the upper end of the metal band plate. 2A and 2B, the column base 14 is inserted into the basic steel pipe 1 and the column base is received in the recess 12a of the rotating plate 12 fixed to the outer periphery of the upper end of the basic steel pipe 1. The base 14b is positioned at a predetermined height inside the basic steel pipe 1 by hooking the 14 hanging plates 14c. And the column 4 inserted in the foundation steel pipe 1 will be in the state supported by the column 14b, and the ready-mixed concrete 8 will be inject | poured around the pillar 4 in the foundation steel pipe 1 in this state.

  Next, a construction method of the basic steel pipe settlement prevention structure 1 configured as described above will be described. First, as shown in FIG. 4 (a), a floor digging 23 having an area where a settlement prevention plate can be installed is applied to the ground on which the column body 4 is to be built, and the buried object at the rotary press-fitting position of the foundation steel pipe 1 is provided. In order to confirm the presence or absence, the leading hole 26 is excavated by hand digging to a depth of about 1 m, for example.

  Next, as shown in FIG.4 (b), the foundation steel pipe 1 is erected in the preceding hole 26 formed in the ground. At this time, the foundation steel pipe 1 is caused to enter the ground by pressing while rotating with the earth auger rotating device 10 via the rotary tool 13 fitted to the rotating plate 12 at the upper end of the foundation steel pipe 1, The foundation steel pipe 1 is made self-supporting by burying the foundation steel pipe 1 to a height at which the ground subsidence prevention plate 3 can be attached.

  Next, as shown in FIG. 4 (c), after performing ground excavation by laying crushed stones 23a, the outer periphery exposed to the ground of the basic steel pipe 1 is formed into a semicircular hole 9a ( (See FIG. 3). Further, the remaining periphery of the basic steel pipe 1 is surrounded by a semicircular hole 9b of the other divided subsidence prevention plate 3b, and the reinforcing frames 16c and 16c of both divided subsidence prevention plates 3a and 3b are bolted 21 as shown in FIG. And a nut 22.

  Next, as shown in FIG. 4 (d), the foundation steel pipe 1 is caused to enter the ground by pressing the foundation steel pipe 1 while rotating again as described above. Rotating and press-fitting until reaching the upper end of the circumferential reinforcing frame 17, and the flange 6 of the basic steel pipe 1 is placed on the circumferential reinforcing frame 17 of the settling prevention plate 3. Thereby, the burial construction of the foundation steel pipe 1 and the installation work of the settlement prevention plate are completed.

  Next, as shown in FIG. 4 (e), the bottom surface of the subsidence prevention plate 3 and the outer periphery of the basic steel pipe 1 are injected by injecting a filler 19 into the hole 18 (see FIG. 1B) of the subsidence prevention plate 3. Reinforce the ground.

  And in order to fix the column 4 in the said basic steel pipe 1, as demonstrated in FIG. 2 (a), (b), the column base 14 is provided in the upper part in said basic steel pipe 1, A column body 4 inserted from above into the basic steel pipe 1 is supported by a column body cradle 14.

  Next, as shown in FIG. 4 (f), by pouring the ready-mixed concrete 8 around the column base 14 in the foundation steel pipe 1, the outer periphery of the foundation steel pipe 1 is solidified by the ready-mixed concrete 8, and the space of the floor digging 23. The soil 24 is backfilled.

  The steel pipe subsidence prevention structure of the present invention has a structure in which a subsidence prevention plate is provided on the base steel pipe used to embed the pole body in order to prevent the subsidence of a pole body such as a utility pole built on soft ground. By improving the structure so as to be simpler, the structure can be used as a structure for preventing the subsidence of the basic steel pipe so as to realize simplification of construction and cost reduction.

DESCRIPTION OF SYMBOLS 1 Basic steel pipe 2 Claw 3 Settlement prevention plates 3a, 3b Divided settlement prevention plate 4 Column body 5 Tube body 6 鍔 7 Rib 8 Ready-mixed concrete 9 Fitting hole 9a, 9b Semi-circular hole 10 Earth auger rotating device 11 Construction column wheel 12 rotation Plate 12a Recess 12b Round hole 13 Rotating tool 14 Column base 14a Metal strip 14b Column base 14c Suspension plate 16 Reinforcement frames 16a and 16b Angle member 16c Reinforcement frame 17 facing each other Reinforcing frame 18 Hole 19 Filling Agent 20 Bolt hole 21 Bolt 22 Nut 23 Floor digging 23a Crushed stone 24 Backfilled soil 25 Soil 26 in the foundation steel pipe Leading hole

Claims (1)

A foundation steel pipe with a plurality of claws on the outer periphery of the lower part is embedded in soft ground by rotary press-fitting from above, and when the lower part of the column is inserted and fixed inside the foundation steel pipe, a subsidence prevention plate is attached to the foundation steel pipe. In the foundation steel pipe settlement prevention structure that prevents the settlement of the foundation steel pipe and the column by fixing, the foundation steel pipe forms a ridge projecting to the outer periphery near the upper end of the tubular body, and the settlement prevention plate is the foundation steel pipe The subsidence prevention plate is divided into separate parts at the positions where the fitting holes formed to be inserted into the semicircular part are divided into semi-circular shapes, and the subsidence prevention plate in the divided state is provided in the semicircular hole and the outer periphery. A reinforcement frame is provided , and a plurality of holes are formed on the outer periphery of the circumferential reinforcement frame formed by joining these divided anti-sag plates, and the foundation steel pipe is embedded in the ground partly in a self-supporting state. Exposed to the ground of the foundation steel pipe A foundation that is rotationally press-fitted into the ground into a circumferential reinforcing frame that is formed by surrounding the circumference with a semi-circular hole in the divided subsidence prevention plate and joining the reinforcing frames on the opposite sides of the divided subsidence prevention plate The steel pipe and the settlement prevention plate are reinforced by injecting a filler into the holes formed in the settlement prevention plate with the steel pipe ridges on top , thereby reinforcing the bottom surface of the settlement prevention plate and the outer periphery of the foundation steel pipe. A structure for preventing the settlement of foundation steel pipes, characterized in that the structure is a combined state.