JP2014173386A - Foundation steel pipe, rotary tool used for foundation steel pipe, and method of constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a foundation steel pipe allowing a construction method to be freely changed according to the situation of a ground when the foundation steel pipe used in the case of erecting a column body such as an electric pole on the ground is buried in soil, and allowing a rapid reconstruction work to be achieved by reducing materials required for connecting and fixing the foundation steel pipe and the column body; a rotary tool used for the foundation steel pipe; and the construction method thereof.SOLUTION: A plurality of rotary tools become usable by providing a pair of support metal fittings at an upper end of a foundation steel pipe, and a construction method can be changed to the optimum one as needed even midway through construction, that is, immediate burying of a foundation steel pipe by rotating an earth auger according to the situation of a ground, or boring by using a screw auger, or the like. Moreover, the strength and amount of materials required for connecting and fixing the foundation steel pipe and a column body are reduced by using a hanging metal fitting locked to the support metal fitting and transmitting vertical load of the column body to the foundation steel pipe without hindering the burying work of the foundation steel pipe, thus enabling the construction to be rapidly executed.

Description

  The present invention relates to a foundation steel pipe used when a pole body such as a utility pole is built on the ground, and a tip claw for cutting the ground is provided at the tip of the foundation steel pipe that is rotationally press-fitted with an earth auger of a digging pillar car. The present invention relates to a foundation steel pipe, a rotary tool used for the foundation steel pipe, and a construction method thereof.

  Conventionally, when building a utility pole on the ground, in order to embed the foundation steel pipe for the utility pole in the ground, it is necessary to dig a leading hole corresponding to the length of the foundation steel pipe with the screw auger of the drilling pillar car . As a conventional technique for performing such prior digging, as described in Patent Document 1, a construction method for a steel pipe foundation structure has been devised. In this construction method, a solid pipe structure (corresponding to the “basic steel pipe” of the present invention) and a sub pipe body are embedded in the vicinity of the soil and bonded together to obtain a solid foundation structure. .

  As a method of burying the main pipe body, a leading hole is drilled by a screw auger attached to a drilling shaft, a pipe body is inserted into the leading hole, and a fitting that protrudes and is fixed to the inside of the vicinity of the pipe body. It has a construction method in which the end of the screw auger is locked to the mating pin and the auger is rotated to embed the parent tube body to a predetermined depth.

  However, in the case of a construction method that requires advance digging in this way, in soft ground, the surrounding ground is loosened, and measures such as leading to collapse of the preceding hole are required, thus preventing rapid column construction. There was a problem.

  On the other hand, the recent rebuilding work of utility poles, etc. is aimed at a large number of telephone poles that have become obsolete nationwide, so very quick construction is required. There was a limit to speed.

  Therefore, as a construction method that does not require prior digging, for example, as shown in Patent Document 2, an auger angle shaft provided in an earth auger drive unit is used as a basic cylinder (corresponding to the “basic steel pipe” of the present invention). A construction method has also been developed in which a foundation cylinder can be directly buried in the ground by rotating an earth auger connected to a rotating tool provided.

  However, there are also soils with different soils at depths, such as embankments, at the construction site, and the method of directly embedding the foundation steel pipe in the ground by rotating press-fitting of the earth auger as described above, when the ground is hard, etc. The embedding work of the basic steel pipe is not efficient, and it is necessary to use it together with a prior excavation with a screw auger or an intermediate excavation with a screw auger (excavation inside the steel pipe). Thus, if the structure of the foundation steel pipe which can change a construction method easily according to the ground is realizable, it will become possible to carry out quick rebuilding work, such as a utility pole, according to the ground condition of the field.

JP 2008-297856 A JP-A-8-135356

  The present invention has been made in view of the above circumstances, and when a foundation steel pipe used for laying a pillar such as a utility pole on the ground is buried in the ground, the foundation steel pipe is grounded by rotation of the earth auger. It is possible to use them freely according to the ground conditions, such as whether to embed them directly in the pipe or to perform excavation with a screw auger.In addition, the pillars can be locked to the upper part of the foundation steel pipe, and the pillars can be attached without using concrete. It aims at providing the foundation steel pipe which can carry out quick rebuilding construction by fixing, the rotary tool used for a foundation steel pipe, and these construction methods.

  In order to achieve the above object, the basic steel pipe according to claim 1 of the present invention is a basic steel pipe in which a plurality of tip claws are provided at intervals in the peripheral portion of the lower end of the steel pipe that is rotationally pressed into the ground. A pair of support fittings to which the first rotary tool or the second rotary tool is attached at a position facing the diametrical direction of the peripheral portion of the upper end of the basic steel pipe are fixed in a protruding state upward from the upper end of the basic steel pipe, and the protruding A through hole and a recessed groove opened upward are formed in the protruding portion of each support fitting, and the first rotary tool is provided at the tip of an auger angle shaft attached to the drilling column at the center upper part of the tool body. And a pair of stopper rods that are removably engaged with the through holes of the pair of support fittings of the basic steel pipe at both ends of the tool body, The rotary tool is installed in the drilling column at the upper center of the tool body. A hole for inserting the tip of the attached screw auger is provided, a locking member for locking the tip of the screw blade of the screw auger is provided in the vicinity of both sides of the hole, and a basic steel pipe is provided at both ends of the tool body. It has the structure provided with the latching | locking edge part detachably inserted in each concave groove of a pair of support metal fittings.

  Further, in the basic steel pipe according to claim 2 of the present invention, the formation position of the through hole formed in the protruding portion of the pair of support fittings fixed in the protruding state upward from the upper end of the basic steel pipe in claim 1 is the ground First rotation by rotating the rotary tool with the stopper rods at both ends of the first rotary tool inserted into the through holes of the pair of support fittings of the foundation steel pipe installed on the upper surface of the steel tube The tool is characterized in that the square hole of the tool is directed vertically upward, and the tip of the auger square shaft suspended vertically downward from the upper end of the boom of the digging column car can be inserted into the square hole. .

  Further, the basic steel pipe according to claim 3 of the present invention is the base steel pipe according to claim 1 or 2, wherein the upper end locking portion and the upper end on both sides are engaged with each concave groove of the pair of support fittings of the basic steel pipe that is rotationally press-fitted into the ground. A suspension fitting having a lower end supporting portion formed in a concave shape and extending downward from the locking portion by a predetermined length is provided in a state of being suspended inside the basic steel pipe, and a column body is provided on the lower end supporting portion of the suspension fitting. The lower end is locked.

  Moreover, the rotary tool used for the foundation steel pipe of Claim 4 of this invention is the periphery of the upper end of the foundation steel pipe which provided the some front-end | tip claw at intervals in the periphery of the lower end of the steel pipe rotationally press-fitted into the ground. A pair of support brackets are fixed at positions opposed to each other in the diametrical direction, and the first rotary tool used when the ground is soft or the like is attached to each support bracket. In the center upper part of the tool body that fits in, a square hole that inserts the tip of the auger angle shaft of the drilling column car and a stopper pin that locks the tip of the auger angle shaft that is inserted in the square hole are provided, and the rotary tool Stopper rods that are locked to the through holes of the respective support fittings and elastic springs that urge the stopper rods outward are provided at both ends of each of the support brackets. Lever that pulls in against elasticity Characterized in that the stopper plate to lock the state of the stopper rod protrudes outward is provided.

  Moreover, the rotary tool used for the basic steel pipe according to claim 5 of the present invention is a peripheral portion of the upper end of the basic steel pipe in which a plurality of tip claws are provided at intervals in the peripheral portion of the lower end of the steel pipe that is rotationally press-fitted into the ground. A pair of support brackets fixed at positions opposed to each other in the diameter direction, and a rotary tool that is attached to each support bracket, and is used when the ground where the work process change to screw auger excavation is easy is hard or the like. The rotary tool of this type consists of a hole for inserting the tip of the screw auger attached to the drilling shaft at the center upper part of the tool body that fits between the pair of support brackets, and a screw auger spiral near both sides of the hole. A locking member that locks the tip of the wing is provided, a locking end portion that is detachably inserted into each concave groove of the locking bracket is provided at both ends of the tool body, and an upper portion of each locking end portion The locking pieces that are rotated by the handle, and each locking piece is a basic steel pipe Characterized in that as engaged in a recess provided in an inner portion of each groove of the pair of support brackets.

  Moreover, the construction method of the foundation steel pipe of Claim 6 of this invention is the construction method of the foundation steel pipe which provided the some front-end | tip claw at intervals in the peripheral part of the lower end of the steel pipe rotationally press-fitted into the ground, In the case of soft or the like, the first rotating tool is used, and the stopper rods provided at both ends of the first rotating tool are locked in the through holes of the pair of support fittings of the foundation steel pipe that is laid down on the ground. An auger suspended vertically downward from the upper end of the boom of the digging pillar car after turning the square tool provided in the upper center of the tool body vertically upward by turning the rotary tool 1 After inserting the tip of the square shaft and rotating the auger angle shaft in this state, the foundation steel pipe standing on the ground is screwed into the ground, and then a pair of support fittings for the foundation steel pipe buried in this ground The base steel is obtained by locking the locking parts on both ends of the suspension bracket in each groove. The lower end of the column is locked to the lower end support of the suspension fitting suspended inside the pipe, the generated soil or sand is filled in the gap between the column and the foundation steel pipe, and crushed stone is poured into the upper part and fixed. It is characterized by being cured by pouring the agent.

  Furthermore, the construction method of the foundation steel pipe of Claim 7 of this invention is the construction method of the foundation steel pipe which provided the some front-end | tip nail at intervals in the peripheral part of the lower end of the steel pipe rotationally press-fitted into the ground, In the case of hard, etc., the second rotary tool is used to excavate the preceding hole by the pre-drilling of the depth corresponding to the foundation steel pipe in the ground by the screw auger attached to the drilling column car. The locking end portions provided at both ends of the steel plate are locked in the concave grooves of the pair of support fittings of the basic steel pipe, and the locking pieces provided at the respective locking end portions are rotated by the handle operation to support the pair of supports. Insert the tip of the screw auger attached to the digging pillar car into the hole provided in the upper center of the second rotating tool, with the state locked to the recess provided inside each concave groove of the metal fitting. At the same time, the tip of the spiral wing of the screw auger Recessed grooves of a pair of support fittings of a foundation steel pipe buried in the ground by screwing the foundation steel pipe into the preceding hole by rotating the screw auger while being engaged with each of the securing members provided in The lower end of the column is locked to the lower end support of the suspension fitting that is suspended inside the foundation steel pipe by engaging the latching parts at both ends of the suspension fitting to the gap between the column and the foundation steel pipe. It is characterized in that it is filled with generated soil or sand, hardened by pouring crushed stone into the upper part and pouring a fixing agent.

  According to the present invention, when a foundation steel pipe used for laying a pillar such as a utility pole on the ground is buried in the soil, when the ground is soft, the pair of support fittings provided at the upper end of the foundation steel pipe By attaching the first rotating tool, the rotational force of the earth auger drive part can be transmitted directly to the foundation steel pipe without going through the screw auger, and further, the foundation steel pipe inserted into the ground can be rocked up and down finely. Therefore, it becomes possible to embed the basic steel pipe directly in the ground by rotating the earth auger without performing prior digging.

  Furthermore, by attaching the first rotary tool to a pair of support fittings provided at the upper end of the foundation steel pipe, compared to the case of using the folding joint described in Patent Document 1 and the rotary tool described in Patent Document 2, It is possible to easily and safely join the foundation steel pipes in a lying state, and to improve the work efficiency.

  Also, if the ground is hard, etc., first form a preceding hole by performing a pre-drilling with a screw auger, and attach a second rotary tool to the support brackets on both sides provided at the upper end of the foundation steel pipe. The foundation steel pipe can be buried in the ground by rotating the earth auger. Furthermore, when the earth auger is rotationally press-fitted into the preceding hole, the screw auger can be removed even when the foundation steel pipe is in a closed state due to earth and sand becoming blocked. Therefore, it is possible to improve the efficiency of the switching work to the process of excavating (introducing) the inside of the basic steel pipe.

  Therefore, according to the present invention, when embedding a foundation steel pipe to be used when building a pole body such as a utility pole on the ground, the foundation steel pipe is submerged by rotation of the earth auger according to the situation of the ground. It is possible to switch to the optimum construction method at any time, even during the construction, such as whether to embed directly in the machine or to perform excavation with a screw auger, so that a quick rebuilding work can be performed.

  Furthermore, according to the present invention, the vertical load applied to the column can be reliably transmitted to the foundation by locking the lower end of the column to the suspension fitting to be locked to the support fitting of the basic steel pipe. The length of the column body can be shortened, and the strength and use amount of the filler necessary for fixing to the column body can be reduced.

  Therefore, according to the present invention, by using the hanging metal fittings hung inside the foundation steel pipe, the crushed stone is thrown into the upper portion where the generated soil or sand is filled in the gap between the column body and the foundation steel pipe, Since the column body can be fixed by curing in a state in which the fixing agent is poured, rapid construction is possible without carrying in a large amount of ready-mixed concrete.

It is sectional drawing which shows the embedding condition of the basic steel pipe used for Example 1 and Example 2 of this invention. It is a figure which shows the basic steel pipe used for Example 1 and Example 2 of this invention, (a) is a side view of the upper part of a basic steel pipe, (b) is a top view of a basic steel pipe, (c) is a lower part of a basic steel pipe (D) is a side view of the upper part of the foundation steel pipe, and (e) is a bottom view of the foundation steel pipe. It is a figure which shows the hanging metal fitting used for Example 1 and Example 2 of this invention, (a) is a top view of a hanging metal fitting, (b) is a side view of a hanging metal fitting, (c) is a front view of a hanging metal fitting, (d) is a side view which shows the upper part of the foundation steel pipe which attached the suspension metal fitting. It is a perspective view which shows the 1st rotary tool used for Example 1 of this invention. It is a figure which shows the 1st rotary tool used for Example 1 of this invention, (a) is a top view of a rotary tool, (b) is a side view of a rotary tool, (c) is an end elevation of a rotary tool, d) is a side view of the stopper plate of the rotary tool. It is a figure which shows the state which attached the 1st rotary tool used for Example 1 of this invention to the foundation steel pipe, (a) is a top view of a foundation steel pipe, (b) is a side view of the upper part of a foundation steel pipe, The side view from the side part direction of the support fitting of a basic steel pipe, (c) is a side view of the upper part of a basic steel pipe, and is a side view from the direction where the front of the support fitting of the basic steel pipe can be seen. (a) is the partial side view which shows the state which attached the 1st rotary tool used for Example 1 of this invention to a horizontal steel pipe, and also inserted the auger angle shaft perpendicularly into the square hole of the 1st rotary tool. (B) is a diagram showing an example in which the auger angle shaft cannot be attached in a vertical state when the formation positions of the through holes of the pair of support fittings fixed to the upper end of the basic steel pipe are not appropriate, (c) FIG. 4 is a view showing an example in which an auger angle shaft cannot be attached in a vertical state in a state in which a first rotary tool is attached to a through hole formed directly at the upper end of a basic steel pipe. (a)-(e) is a construction drawing which shows the embedding method of the foundation steel pipe at the time of attaching the 1st rotary tool used for Example 1 of this invention. It is a perspective view which shows the rotary tool used for Example 2 of this invention. It is a figure which shows the rotary tool used for Example 2 of this invention, (a) is a top view of a rotary tool, (b) is a side view of a rotary tool, (c) is an end view of a rotary tool. It is a figure which shows the state which attached the 2nd rotary tool used for Example 2 of this invention to a foundation steel pipe, (a) is a top view of a foundation steel pipe, (b) is a side view of the upper part of a foundation steel pipe, The side view from the side part direction of the support fitting of a basic steel pipe, (c) is a side view of the upper part of a basic steel pipe, and is a side view from the direction where the front of the support fitting of the basic steel pipe can be seen. (a)-(e) is a construction drawing which shows the embedding method of the foundation steel pipe at the time of attaching the 2nd rotary tool used for Example 2 of this invention.

  In the present invention, when a pole body P such as a utility pole is built on the ground G as shown in FIG. 1, a plurality of tip claws 2 are provided at intervals in the periphery of the lower end of the tubular body 1 a that is rotationally press-fitted into the ground G. The provided basic steel pipe 1 is used.

  In the present invention, the first rotary tool 3 shown in Example 1 and Example 2 described later (see FIG. 4) according to the state of the ground G in which the foundation steel pipe 1 is to be embedded (difference in softness or hardness). Or by using the 2nd rotary tool 4 (refer FIG. 9) properly, according to the condition of the ground G, a rapid pillar construction is enabled.

  Accordingly, in the present invention, in any of the embodiments to be described later, since the basic steel pipe 1 shown in FIG. 1 or FIG. 2 and the hanging metal fitting 5 shown in FIG. 1 or FIG. The hanging metal fitting 5 will be described.

  As shown in FIGS. 2 (a) to 2 (e), the base steel pipe 1 is fixed so that the support metal fitting 6 protrudes upward at a position facing the diametrical direction at the upper end of the base steel pipe 1. A through hole 7 and a concave groove 8 that opens upward are formed in the protruding portion 6 a of 6.

  That is, the above-described basic steel pipe 1 is formed into a cylindrical shape using, for example, a steel material, and a plurality of pieces are provided on the outer periphery in the vicinity of the upper end of the basic steel pipe 1 as shown in FIG. 2 (a), (b) or (d). A flange-shaped flange 9 reinforced by an angle member 9a is fixed. As shown in FIG. 2 (b), the support fittings 6, 6 are fixed at positions that face each other in the diametrical direction at the periphery of the upper end of the basic steel pipe 1 at the top of the flange 9.

  As shown in FIG. 2 (d), each support fitting 6 is fixed by welding or the like in a protruding state above the basic steel pipe 1 using a rectangular metal plate, and at the end of the protruding portion 6a, A through hole 7 into which a stopper rod 10 provided in a first rotary tool 3 described later is inserted is formed, and a concave groove 8 having an open top is formed at an adjacent position.

  The formation positions of the through holes 7 and 7 formed in the protruding portions 6a and 6a of the pair of support fittings 6 and 6 fixed in a protruding state upward from the upper end of the basic steel pipe 1 are preferably as follows. That is, as shown in FIG. 7 (a), the first rotary tool 3 described later is inserted into each of the through holes 7 and 7 of the pair of support fittings 6 and 6 of the foundation steel pipe 1 installed on the upper surface of the ground G in a laid state. When the rotary tool 3 is rotated with the stopper rods 10 and 10 at both ends thereof being inserted, the square hole 16 provided in the first rotary tool 3 is directed vertically upward, and the square hole 16 is dug. The end of the auger angle shaft S suspended vertically downward from the upper end of the boom B of the building column C (see FIG. 8 (a)) needs to be positioned so that it can be inserted.

  In addition, as shown in FIG.7 (b), the position where a pair of support metal fittings 6 and 6 fixed to the upper end of the foundation steel pipe 1 protrude upwards from the upper end of the foundation steel pipe 1 is low, and the formation position of the through holes 7 and 7 Is not appropriate, it is impossible to attach the auger angle shaft S to the end of the foundation steel pipe 1 in a vertical state. For this reason, the auger square shaft S suspended vertically downward from the upper end of the boom B of the digging column car C (see FIG. 8A) is inserted into the square hole 16 provided in the first rotary tool 3. Attempting to do so makes the auger angle shaft S in an oblique state, making the operation difficult.

  Moreover, as shown in FIG.7 (c), the case where the 1st rotary tool 3 is attached to the through-hole 7 directly formed in the upper end of the basic steel pipe 1, without providing the support metal fitting 6 in the upper end of the basic steel pipe 1. Further, the auger angle shaft S hits the end of the basic steel pipe 1, and the insertion work becomes more difficult.

  Further, the concave groove 8 provided in the support metal fitting 6 is formed in a concave shape for detachably inserting a locking end portion 11 of the second rotary tool 4 described later. A recess 14 is formed for locking a locking piece 13 that is rotated by a handle 12 provided on the upper portion of the locking end 11 described later.

  Moreover, as shown in FIG.2 (c) or (e), the front-end | tip nail | claw 2 is provided in the peripheral part of the lower end of the basic steel pipe 1 at intervals. In the present embodiment, four tip claws 2 are fixed at equal intervals along the outer peripheral surface of the lower end of the basic steel pipe 1, but other plural tip claws 2 may be provided. In addition, by forming the outer diameter of the foundation steel pipe 1 to be slightly larger than the screw auger S2, in the case of preceding drilling, the tip claw 2 is provided with the leading hole H so that the foundation steel pipe 1 does not become unstable with respect to the ground. It is inserted into the ground while shaving the wall surface.

  Further, as shown in FIGS. 3A to 3D, the hanging metal fitting 5 of the present embodiment is engaged with the upper end latching that is engaged with the concave groove 8 of each support fitting 6 at the upper end of the tubular body 1 a of the basic steel pipe 1. A concave shape is formed by extending downward by a predetermined length from the portion 5a and the upper end locking portions 5a, 5a on both sides, and a lower end support portion 5b formed by a square pipe is provided below the concave shape. . Then, as shown in FIG. 3 (d), the suspension metal fitting 5 is installed in a suspended state inside the basic steel pipe 1 as described above. As shown in FIG. 1, the lower end support portion 5b of the suspension metal fitting 5 is provided. The column body P is erected by locking the lower end of the column body P to the bottom.

  In this embodiment, the structure of the first rotary tool 3 used when the foundation steel pipe 1 is embedded in the soft ground G and the construction method thereof will be described. As shown in FIGS. 4 and 5, the first rotary tool 3 has a square shape in which a tip of an auger angle shaft S attached to a digging pillar car C described later is inserted into an upper center portion of a tool body 3 a. It is configured to have a hole 16 and a pair of stopper rods 10 provided at both ends of the tool body 3a and removably locked in the through holes 7 of the support fitting 6 on both sides of the basic steel pipe 1 ( (See FIG. 6).

  The first rotary tool 3 will be described in detail. As shown in FIG. 4, the tool body 3 a (see FIG. 6) having a length that fits between the support brackets 6 on both sides of the basic steel pipe 1 A holding body 3b projecting upward is formed, and a square hole 16 into which the tip of the auger angle shaft S of the digging column car C is inserted is formed in the holding body 3b. As shown in FIG. 5B, a square hole 16a is also formed in the bottom of the holding body 3b, and the auger angle shaft S can be fixed at an arbitrary height as will be described later.

  Further, as shown in FIGS. 5 (a) to 5 (c), an insertion hole 3c formed in the direction of the square hole 16 is formed in the side portion of the holding body 3b, and the elastic spring 3d is elastically formed in the insertion hole 3c. By inserting the stopper pin 17a of the fastening handle 17 to be connected, the stopper pin 17a is inserted into the locking hole S1 of the auger angle shaft S inserted into the square hole 16, so that the auger angle shaft S is square. It can function as a stopper that prevents the hole 16 from slipping out. As shown in FIG. 4, a plurality of locking holes S1 of the auger angle shaft S are formed at predetermined intervals. As described above, the auger angle shaft S is moved from the square hole 16 above the holding body 3b to the bottom portion. It can be inserted in the direction of the rectangular hole 16a and fixed at an arbitrary height.

  Furthermore, the stopper rod 10 latched by the through-hole 7 of the said support metal fitting 6 is inserted in the internal passage part 18 formed in the both ends of the tool main body 3a of the 1st rotary tool 3 so that insertion / extraction is possible. . A resilient spring 19 for urging the stopper rod 10 outward is incorporated in the inner part of each inner passage 18 formed at both ends of the tool body, and the stopper rod 10 is attached to the resilient spring 19. A lever 20 that is pulled in against the elasticity is provided in a state of protruding upward.

  Further, a plate-shaped stopper plate 22 (see FIG. 5D) is provided to be inserted from above into the moving groove 21 for pulling the lever 20 in. The side of the stopper plate 22 includes a step 22a for restricting the insertion depth when the stopper 22 is inserted into the moving groove 21 and a band 22c (see FIG. 4) fixed to the tool body 3a. A hole 22b for locking the end is provided.

  With the above configuration, with the stopper 22 extracted from the moving groove 21, for example, each lever 20 of the first rotary tool 3 is pulled inward against the elasticity of the spring spring 19, thereby stopping the stopper rod 10. Is stored inside the tool body 3a. By such an operation, as shown in FIGS. 6A to 6C, the stopper rods 10 are inserted into the through holes 7 and 7 of the support fittings 6 and 6 on both sides of the basic steel pipe 1 and locked. By inserting the stopper plate 22 into the movement groove 21 of the lever 20 from above and preventing the stopper plate 22 from coming off by the band 22c, the unexpected pull-in operation of each stopper rod 10 can be stopped.

  In order to build the column P using the first rotary tool 3 described above, when the ground G is soft or the like, as shown in FIG. 8A, the square hole of the first rotary tool 3 is used. 16, the tip of the auger shaft S attached to the digging column car C (see FIG. 8A) is inserted (see FIG. 4), and the first rotation is performed as shown in FIG. The pair of stopper rods 10, 10 provided at both ends of the tool 3 are locked in the through holes 7, 7 of the support brackets 6, 6 on both sides.

  Next, as shown in FIG. 8 (b), the auger angle shaft S attached to the digging pillar car C is lifted upward, and the auger angle shaft S is rotated to turn the foundation steel pipe 1 standing on the ground G to the ground. Screw in. Then, as shown in FIG. 8 (c), in the recessed grooves 8 and 8 of the support fittings 6 and 6 on both sides of the foundation steel pipe 1 buried in the ground, the upper ends of both ends of the suspension fitting 5 as shown in FIG. 3 (d). The lower end portion of the column P is locked to the bottom plate 5c of the lower end support portion 5b of the suspension fitting 5 installed in a suspended state inside the basic steel pipe 1.

  Further, as shown in FIG. 8 (e), the generated soil or sand 25 is filled in the gap between the column P and the basic steel pipe 1, and the crushed stone 26 is introduced into the upper portion to fix the fluid 27 with a high fluidity fixing agent 27 such as mortar. Cured by pouring. In this way, by locking the pillar body P with the hanging metal fitting 5, a lid made of the crushed stone 26 and the fixing agent 27 is formed on the generated soil or sand 25 filled in the gap between the pillar body P and the foundation steel pipe 1. The basic steel pipe 1 and the column P can be firmly fixed by a fixing method of a certain degree.

  In this embodiment, in the hard ground G or the like, it is used when the foundation steel pipe 1 is buried in the ground that requires a prior excavation by the screw auger S2 or an intermediate excavation by the screw auger S2 (excavation inside the foundation steel pipe 1). The structure of the 2nd rotary tool 4 to perform and these construction methods are demonstrated. As shown in FIGS. 9 and 10, the second rotary tool 4 includes a screw auger S2 attached to the digging pillar car C as shown in FIG. A hole 23 for inserting the tip is provided, and locking members 24 for locking the tip of the spiral blade S3 of the screw auger S2 are provided on both sides in the vicinity of the hole 23.

  Further, as shown in FIG. 4, locking ends that are detachably inserted into the respective concave grooves 8 of the support fitting 6 on both sides of the basic steel pipe 1 at both ends of the tool body 4 a of the second rotary tool 4. It is set as the structure by which the part 11 was provided (refer Fig.6 (a)-(c)).

  The second rotary tool 4 will be described in detail. As shown in FIG. 9 or FIG. 10 (a), a drilling pillar is provided at the upper center of the tool body 4a as shown in FIG. 12 (a). A hole 23 for inserting the tip of the screw auger S2 attached to the car C is provided, and locking members 24, 24 for locking the tip of the spiral blade S3 of the screw auger S2 on both sides in the vicinity of the hole 23. Is provided. In addition, by providing these locking members 24, 24 on both sides in the vicinity of the hole 23, the tip of the spiral blade S3 of the screw auger S2 can be hooked in accordance with both forward and reverse rotations of the screw auger S2. It becomes possible.

  Further, as shown in FIG. 9 or FIG. 10, locking end portions 11, 11 that are detachably inserted into the recessed grooves 8, 8 of the support fittings 6, 6 on both sides of the basic steel pipe 1 at both ends of the tool body 4 a. , And a locking piece 13 that is rotated by the handle 12 is provided above each locking end 11. With such a configuration, by rotating the handle 12, the locking piece 13 is locked to the concave portion 14 provided in the inner portion of the concave groove 8 of each support fitting 6, as shown in FIG. It can function as a stopper.

  As shown in FIG. 9, the stoppers 13a and 13a provided on the upper ends of the locking ends 11 and 11 at both ends of the tool body 4a are provided with locking pieces 13 rotated by the handles 12, respectively. In the state of being engaged with the concave portion 14 of the six concave grooves 8, the rotation is restricted.

  In order to build a pole body P such as a utility pole using the second rotary tool 4 described above, when the ground G is hard or the like, as shown in FIG. The preceding hole H is excavated by the preceding excavation with a depth corresponding to the basic steel pipe 1 by the screw auger S2 attached to the pipe. Next, as shown in FIGS. 11 (a) to 11 (c), the second rotary tool 4 is attached to the support fittings 6, 6 at both ends of the upper end of the basic steel pipe 1.

  Next, as shown in FIG. 12 (b), the screw attached to the digging column car C in the hole 23 of the second rotary tool 4 attached to the support brackets 6, 6 at the upper end of the basic steel pipe 1. Insert the tip of the auger S2. Then, the tip of the spiral blade S3 of the screw auger S2 is locked to the locking members 24, 24, and the locking provided at both ends of the second rotary tool 4 as shown in FIGS. 11 (a) to 11 (c). The end portion 11 is inserted into each concave groove 8 of the support metal fitting 6 on both sides. Further, in this state, the locking piece 13 provided at the upper part of the locking end portion 11 is rotated by the operation of the handle 12, thereby engaging with the concave portion 14 provided in the inner portion of the concave groove 8 of each support fitting 6. Stop it.

  Next, as shown in FIG. 12B, the basic steel pipe 1 is screwed into the preceding hole H by rotating the screw auger S2. In addition, when the basic steel pipe 1 is screwed in, the earth and sand g obtained by drilling the wall surface of the preceding hole H whose diameter has been expanded by the tip claw 2 is deposited on the preceding hole bottom H, and the tip of the basic steel pipe 1 is closed. 12 (c), it is necessary to remove the rotary tool 4 once and insert the screw auger S2 into the steel pipe foundation 1 to excavate the earth and sand g inside the steel pipe foundation 1. However, since the work of attaching / detaching the screw auger S2 is not required, the work process can be easily changed. Further, as shown in FIG. 12 (d), the locking portions 23 at the upper ends of the suspension metal fitting 5 are engaged with the concave grooves 8 and 8 of the support metal fittings 6 and 6 on both sides of the foundation steel pipe 1 buried in the ground. As shown in FIG. 12 (e), the lower end portion of the column P is locked to the bottom plate 5 c of the lower end support portion 5 b of the suspension fitting 5 installed in a suspended state inside the basic steel pipe 1.

  Furthermore, as shown in FIG. 12 (f), the generated soil or sand 25 is filled in the gap between the column P and the basic steel pipe 1, and the crushed stone 26 is introduced into the upper portion to fix the fluid 27 with a high fluidity fixing agent 27 such as mortar. Cured by pouring. Thus, by locking the column P with the hanging metal fitting 5, a lid is formed by the crushed stone 26 and the fixing agent 27 on the generated soil or sand 25 filled in the gap between the column P and the foundation steel pipe 1. With this fixing method, the basic steel pipe 1 and the column P can be firmly fixed.

  The foundation steel pipe of the present invention, the rotary tool used for the foundation steel pipe, and the construction method thereof, depending on the situation of the ground, when the foundation steel pipe used when laying the pole body such as a utility pole on the ground is buried in the soil It is possible to switch to the optimal construction method at any time even during construction, and it is necessary for fixing the connection to the column body by transmitting the vertical load of the column to the foundation steel tube with a structure that does not hinder the foundation steel pipe burial work By reducing the material strength and quantity, it can be used as a foundation steel pipe, a rotary tool used for the foundation steel pipe, and a construction method thereof that can perform a quick rebuilding work.

DESCRIPTION OF SYMBOLS 1 Basic steel pipe 1a Tube 2 Tip nail 3 1st rotary tool 3a Tool main body 3b Holding body 3c Insertion hole 3d Elastic spring 4 2nd rotary tool 4a Tool main body 5 Suspension metal fitting 5a Upper end locking part 5b Lower end support part 5c Bottom plate 6 Support metal fitting 6a Protruding part 7 Through hole 8 Groove 9 Flange 9a Angle member 10 Stopper rod 11 Locking end 12 Handle 13 Locking piece 13a Stopper 14 Recess 15 Ring member 16 Square hole 16a Square hole 17 at the bottom 17a Stopper pin 18 Inner passage portion 19 Bounce spring 20 Lever 21 Movement groove 22 Stopper plate 22a Step 22b Hole portion 22c Band 23 Hole portion 24 Locking member 25 Generated soil or sand 26 Crushed stone 27 Fixing agent C G ground g earth and sand H preceding hole P pillar S auger angle shaft S1 locking hole S2 screw auger S3 spiral wing

Moreover, the rotary tool used for the basic steel pipe according to claim 5 of the present invention is a peripheral portion of the upper end of the basic steel pipe in which a plurality of tip claws are provided at intervals in the peripheral portion of the lower end of the steel pipe that is rotationally press-fitted into the ground. A pair of support brackets are fixed at positions opposed to each other in the diameter direction of the rotary tool attached to each support bracket, and the second rotary tool used when the ground is hard is provided between the pair of support brackets. A hole that inserts the tip of the screw auger attached to the drilling column car and a locking member that locks the tip of the screw blade of the screw auger are provided in the vicinity of both sides of the hole at the upper center of the tool body. A locking end portion is provided at both ends of the tool body so as to be removably inserted into each concave groove of the support bracket, and further, a locking piece that is rotated by a handle at the top of each locking end portion, A stop piece was provided on the inner side of each concave groove of a pair of support fittings of the foundation steel pipe. Characterized in that so as to engaged with the part.

Moreover, the construction method of the foundation steel pipe of Claim 6 of this invention is the construction method of the foundation steel pipe which provided the some front-end | tip claw at intervals in the peripheral part of the lower end of the steel pipe rotationally press-fitted into the ground, In the case of soft or the like, the first rotating tool is used, and the stopper rods provided at both ends of the first rotating tool are locked in the through holes of the pair of support fittings of the foundation steel pipe that is laid down on the ground. An auger suspended vertically downward from the upper end of the boom of the digging pillar car after turning the square tool provided in the upper center of the tool body vertically upward by turning the rotary tool 1 After inserting the tip of the square shaft and rotating the auger angle shaft in this state, the foundation steel pipe standing on the ground is screwed into the ground, and then a pair of support fittings for the foundation steel pipe buried in this ground Engage the upper end locking part at the top of both ends of the suspension bracket in each concave groove. The bottom end of the column is locked to the lower end support of the suspension fitting suspended inside the foundation steel pipe, the generated soil or sand is filled in the gap between the column and the foundation steel pipe, and crushed stone is thrown into the top. It is characterized by being cured by pouring a fixative.

Furthermore, the construction method of the foundation steel pipe of Claim 7 of this invention is the construction method of the foundation steel pipe which provided the some front-end | tip nail at intervals in the peripheral part of the lower end of the steel pipe rotationally press-fitted into the ground, If it is hard, use the second rotary tool to drill the preceding hole by the pre-drilling of the depth corresponding to the foundation steel pipe in the ground with the screw auger attached to the drilling pillar, and then A pair of support brackets are provided by locking the latching end portions provided at both ends to the respective concave grooves of the pair of support brackets of the basic steel pipe and rotating the latching pieces provided at the respective latching end portions by a handle operation. The tip of the screw auger attached to the drilling column car is inserted into the hole provided in the upper center of the second rotary tool in a state of being locked in the recess provided inside each of the concave grooves. And the tip of the spiral wing of the screw auger as a second rotary tool In a state of being locked to each of the provided locking members, by rotating the screw auger, the base steel pipe is screwed into the preceding hole, thereby being embedded in each concave groove of the pair of support fittings of the base steel pipe buried in the ground. The upper end locking part at the upper end of both ends of the hanging bracket is locked and the lower end of the column is locked to the lower end support of the hanging bracket suspended inside the foundation steel pipe. It is characterized in that it is filled with generated soil or sand, hardened by pouring crushed stone into the upper part and pouring a fixing agent.

Next, as shown in FIG. 8 (b), the auger angle shaft S attached to the digging pillar car C is lifted upward, and the auger angle shaft S is rotated to turn the foundation steel pipe 1 standing on the ground G to the ground. Screw in. Then, as shown in FIG. 8 (c), in the recessed grooves 8 and 8 of the support fittings 6 and 6 on both sides of the foundation steel pipe 1 buried in the ground, the upper ends of both ends of the suspension fitting 5 as shown in FIG. 3 (d). The upper end locking portions 5a and 5a are locked, and the lower end portion of the column P is locked to the bottom plate 5c of the lower end support portion 5b of the hanging metal fitting 5 installed in a suspended state inside the basic steel pipe 1.

Claims (7)

In a basic steel pipe in which a plurality of tip claws are provided at intervals in a peripheral portion at the lower end of a steel pipe that is rotationally press-fitted into the ground, the first rotary tool or a position facing the diameter direction of the peripheral portion at the upper end of the basic steel pipe A pair of support fittings to which the second rotary tool is attached is fixed in a state protruding upward from the upper end of the basic steel pipe, and a through hole and a recessed groove having an open top are formed in the protruding portion of each protruding support fitting. ,
The first rotary tool is provided with a square hole for inserting the tip of an auger square shaft attached to a drilling shaft at the center upper portion of the tool body, and a pair of support fittings of a basic steel pipe at both ends of the tool body. It has a configuration provided with a pair of stopper rods that are removably locked in each through hole,
The second rotary tool is provided with a hole portion for inserting a tip of a screw auger attached to a drilling column at the center upper portion of the tool body, and the tip of the spiral auger of the screw auger near both sides of the hole portion. And a locking end portion that is detachably inserted into each groove of the pair of support fittings of the basic steel pipe at both ends of the tool body. Basic steel pipe. The through hole formed in the protruding part of the pair of support fittings fixed in a protruding state upward from the upper end of the foundation steel pipe is located in the through holes of the pair of support fittings of the foundation steel pipe installed in a laid state on the upper surface of the ground. By turning the rotary tool with the stopper rods at both ends of the first rotary tool inserted into the square hole, the square hole of the first rotary tool is directed vertically upward, and 2. A basic steel pipe according to claim 1, wherein the end of the auger angle shaft suspended vertically downward from the upper end of the boom can be inserted. An upper end locking portion that locks into each concave groove of a pair of support fittings of a base steel pipe that is rotationally press-fitted into the ground, and a lower end support portion that extends downward from the upper end locking portions on both sides by a predetermined length and is formed in a concave shape The base steel pipe according to claim 1 or 2, wherein a suspension metal fitting having a wall is provided in a state suspended from the inside of the basic steel pipe, and the lower end of the column is locked to a lower end support portion of the suspension metal fitting. . A pair of support metal fittings are fixed to each support metal fitting in a diametrically opposed position at the upper circumference of the basic steel pipe with a plurality of tip claws provided at intervals around the lower circumference of the steel pipe that is press-fitted into the ground. A rotary tool to be attached, which is used when the ground is soft, etc.
A square hole for inserting the tip of the auger angle shaft of the digging column car into the center upper part of the tool body that fits between the pair of support brackets, and a stopper pin for locking the tip of the auger angle shaft inserted in the square hole Are provided at both ends of the rotary tool with stopper rods that are locked in the through holes of the support brackets, and resilient springs that urge the stopper rods outward, and at each part of the tool body, there are stoppers. A rotary tool used for a basic steel pipe, characterized in that a lever for pulling the rod against the elasticity of the elastic spring and a stopper plate for locking each stopper rod projecting outward are provided. . A pair of support metal fittings are fixed to each support metal fitting in a diametrically opposed position at the upper circumference of the basic steel pipe with a plurality of tip claws provided at intervals around the lower circumference of the steel pipe that is press-fitted into the ground. A rotary tool to be attached, and the second rotary tool used when the ground is hard is:
Attach the tip of the screw auger attached to the drilling shaft to the center upper part of the tool body that fits between the pair of support fittings, and the tip of the screw auger blade near both sides of the hole. A locking member is provided, a locking end is provided at each end of the tool body so as to be detachably inserted into each concave groove of the locking bracket, and is further rotated by a handle above each locking end. A rotating tool used for a basic steel pipe, wherein the locking piece is engaged with each other, and each locking piece is locked in a recess provided in an inner portion of each concave groove of a pair of support fittings of the basic steel pipe. In the construction method of a basic steel pipe with multiple tip claws spaced at the periphery of the lower end of the steel pipe that is rotationally press-fitted into the ground, if the ground is soft, etc., use the first rotating tool and lie down on the ground The stopper rods provided at both ends of the first rotary tool are engaged with the through holes of the pair of support fittings of the foundation steel pipe, and the first rotary tool is rotated to be provided at the upper center of the tool body. After a certain square hole is directed vertically upward, the tip of the auger angle shaft suspended vertically downward from the upper end of the boom of the digging column car is inserted into the square hole, and the auger angle shaft is rotated in this state. After the foundation steel pipe standing on the ground is screwed into the ground, the locking parts at the upper ends of both ends of the hanging metal fitting are locked in the respective concave grooves of the pair of support metal fittings of the foundation steel pipe buried in the ground. Under the column at the lower end support of the hanging bracket suspended inside the foundation steel pipe The construction method of the basic steel pipe, which is hardened by filling the generated soil or sand into the gap between the column and the basic steel pipe, putting crushed stone into the upper part and pouring the fixing agent . In the construction method of the foundation steel pipe which provided a plurality of claw at intervals around the lower end of the steel pipe which is press-fitted into the ground, when the ground is hard, the second rotary tool is used to drill After excavating a preceding hole by a preceding excavation with a depth corresponding to the foundation steel pipe with the attached screw auger, the locking end portions provided at both ends of the second rotary tool are connected to each of the pair of support fittings of the foundation steel pipe. While locking to the concave groove, the locking piece provided at each locking end is rotated by the handle operation to be locked in the concave portion provided inside each concave groove of the pair of support fittings, The tip of the screw auger attached to the drilling column is inserted into the hole provided in the upper center of the second rotary tool, and the tip of the spiral blade of the screw auger is provided on the second rotary tool. In the state of being locked to each locking member, the screw Rotate the base steel pipe into the preceding hole by locking the hooks on both ends of the suspension metal fittings into the concave grooves of the pair of support steel pipes embedded in the ground. The bottom end of the column is locked to the bottom support part of the hanging bracket suspended inside, the generated soil or sand is filled in the gap between the column and the foundation steel pipe, and crushed stone is poured into the upper part to fix the fixing agent. A method of constructing a basic steel pipe characterized by being hardened by pouring.