JP5860662B2 - Structural members for steel tower foundation, steel tower foundation, and construction method of steel tower foundation - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steel tower foundation component for installing a transmission line, a steel tower foundation, and a method for constructing a steel tower foundation.

  Conventionally, a steel tower for laying a transmission line is provided on a steel tower foundation (concrete foundation) having a pillar body that supports the legs of the steel tower and a floor plate that transmits the load of the steel tower to the ground (for example, Patent Documents). 1). The load supported by the tower foundation is mainly composed of a load applied to the tower itself and a load applied to a transmission line constructed by the tower. This steel tower foundation is constructed so as to have a supporting force capable of supporting these loads.

JP 2002-256573 A

  However, when it is necessary to increase the transmission capacity of the power transmission facility after the steel tower foundation is constructed, a construction for replacing the transmission line is performed in the power transmission facility. Due to this replacement work, the load on the steel tower foundation may increase. For example, when the load acting on the power transmission line increases among the loads acting on the steel tower foundation due to the exchange of the power transmission line and the support metal supporting the power transmission line, the load acting on the steel tower foundation increases. Moreover, when the load acting on the steel tower itself is increased by repairing the steel tower itself as the load acting on the transmission line increases, the load acting on the steel tower foundation increases.

  For this reason, the power transmission equipment must reconstruct the tower foundation to cope with this newly increased load. Therefore, the steel tower foundation described in Patent Document 1 is reconstructed so that the increased load can be supported by the existing foundation left after removing a part of the steel tower foundation and the newly constructed additional foundation. Is.

  In addition, the tower foundation is more strongly affected by wind loads such as typhoons and seasonal winds than by the weight of the tower itself, the weight of electric wires and supporting hardware. As a result, a downward compressive load acts on the leeward leg, while a lifting load (pullout force) acts on the leeward leg. This compressive load is a load applied in the direction in which the legs of the steel tower compress the steel tower foundation. The direction of the compressive load is a direction in which the longitudinal direction of the steel tower is directed downward. The lifting load is a load applied in the direction in which the leg of the tower pulls out the tower foundation. The direction of the lifting load is a direction in which the longitudinal direction of the steel tower is directed upward. Steel tower foundations often have a small bearing capacity for lifting loads.

  Accordingly, the lifting load is more dominant than the compressive load on the steel tower foundation. Therefore, the increased compressive load can be supported by the supporting force of the existing steel tower foundation, but the increased lifting load may not be supported by the supporting power of the existing steel tower foundation. In other words, the existing concrete foundation may have insufficient supporting force to support the lifting load. The steel tower foundation to be reconstructed needs to have a bearing capacity that can support the increased lifting load.

  Therefore, in view of such circumstances, an object of the present invention is to provide a structural member for a steel tower foundation, a steel tower foundation, and a construction method for the steel tower foundation having a supporting force capable of efficiently supporting an increasing lifting load.

  The structural member for a steel tower foundation according to the present invention is a structural member for a steel tower foundation provided on a concrete foundation that supports a lower portion of a leg portion of the steel tower, wherein the concrete foundation has a predetermined length in the longitudinal direction of the leg portion. And a floor plate provided at a lower portion of the column body, and a flange portion having a larger area than the floor plate in a direction intersecting the column body, and a flange portion coupled to the leg portion of the tower. And a connecting member.

  According to this structure, the load of the steel tower which acts on a concrete foundation from the leg part of a steel tower acts also on a collar part via the connection member connected with the leg part of the said steel tower. The lifting load transmitted from the steel tower to the steel tower foundation is supported by the support force of the steel tower foundation due to the earth pressure applied to the ridges of the component members, and the weight of the component members themselves and the weight of the concrete foundation. That is, when the eaves part has a larger area than the floor board of the concrete foundation, the earth pressure applied to the eaves part of the component member is increased corresponding to the load newly applied to the steel tower foundation. Therefore, the structural member can construct a steel tower foundation having a supporting force that efficiently supports an increasing lifting load by using a concrete foundation.

  Moreover, according to this invention, while the said collar part is cyclically | annularly formed along the perimeter of the said column, it is preferable to be comprised from the several division body which can be divided | segmented into the circumferential direction of the said column. .

  According to this structure, even if it is a case where a collar part is arrange | positioned so that a pillar may be enclosed, after a construction member constructs a pillar and supports the leg part of a steel tower to the said pillar, a collar part The construction which installs can be done.

  Moreover, according to this invention, the said connection member is provided with the 1st connection member connected to the leg part of the said steel tower, and the 2nd connection member which connects this 1st connection member to the said collar part. It is preferable.

  According to this structure, the load of the steel tower which acts on a concrete foundation from the leg part of a steel tower acts also on a collar part via the connection member connected with the leg part of the said steel tower. The lifting load transmitted from the steel tower to the steel tower foundation is supported by the support force of the steel tower foundation due to the earth pressure applied to the ridges of the component members, and the weight of the component members themselves and the weight of the concrete foundation. That is, when the eaves part has a larger area than the floor board of the concrete foundation, the earth pressure applied to the eaves part of the component member is increased corresponding to the load newly applied to the steel tower foundation. Therefore, the structural member can construct a steel tower foundation having a supporting force that efficiently supports an increasing lifting load by using a concrete foundation.

  Moreover, according to this invention, it is preferable that a said 2nd connection member is provided with the cylinder part which covers the said column.

  According to such a configuration, a gap is formed between the cylinder portion and the column body by being installed so as to surround the column body. By filling the gap with mortar, concrete, or the like, the cylindrical portion is bonded to the column. That is, the structural member is configured integrally with the concrete foundation. Therefore, even when a tipping moment is applied to the steel tower, the component acts integrally with the concrete foundation, and the concrete foundation can be used for steadying.

  Further, according to the present invention, it is preferable that the cylindrical portion is composed of a plurality of divided bodies that can be divided in the circumferential direction.

  According to such a configuration, the construction member installs the column body and installs the cylinder portion that is installed so as to surround the column body in the circumferential direction even after the leg portion of the steel tower is supported by the column body. can do.

  In addition, a steel tower foundation for a steel tower according to the present invention includes a column having a predetermined length in the longitudinal direction of the leg, a floor plate provided at a lower portion of the column, and the constituent member. Features.

  According to this structure, the load of the steel tower which acts on a concrete foundation from the leg part of a steel tower acts also on a collar part via the connection member connected with the leg part of the said steel tower. The lifting load transmitted from the steel tower to the steel tower foundation is supported by the support force of the steel tower foundation due to the earth pressure applied to the ridges of the component members, and the weight of the component members themselves and the weight of the concrete foundation. That is, when the eaves part has a larger area than the floor board of the concrete foundation, the earth pressure applied to the eaves part of the component member is increased corresponding to the load newly applied to the steel tower foundation. Therefore, the structural member can construct a steel tower foundation having a supporting force that efficiently supports an increasing lifting load by using a concrete foundation.

  Moreover, the construction method of the steel tower foundation for the steel tower according to the present invention is a construction method of the steel tower foundation using the constituent members, and the saddle part installation is performed so as to cross the longitudinal part of the column body. And a connecting step of connecting a collar portion to a leg portion of the steel tower with the connecting member.

  According to this structure, the load of the steel tower which acts on a concrete foundation from the leg part of a steel tower acts also on a collar part via the connection member connected with the leg part of the said steel tower. The lifting load transmitted from the steel tower to the steel tower foundation is supported by the support force of the steel tower foundation due to the earth pressure applied to the ridges of the component members, and the weight of the component members themselves and the weight of the concrete foundation. That is, when the eaves part has a larger area than the floor board of the concrete foundation, the earth pressure applied to the eaves part of the component member is increased corresponding to the load newly applied to the steel tower foundation. Therefore, the structural member can construct a steel tower foundation having a supporting force that efficiently supports an increasing lifting load by using a concrete foundation.

Further, the construction method of the steel tower foundation for the steel tower according to the present invention is a construction method of the steel tower foundation using the structural members for the steel tower foundation, and is installed so as to intersect the longitudinal direction of the column body. A flange portion installation step, a first connection step of connecting the second connecting member to the flange portion after the flange portion installation step, and the cylindrical portion and the column body after the first connection step. a closing step of closing the gap between, characterized in that it comprises a second connecting step of connecting the first connecting member to the leg portion of the tower after the blocking step.

  According to this structure, the load of the steel tower which acts on a concrete foundation from the leg part of a steel tower acts also on a collar part via the connection member connected with the leg part of the said steel tower. The lifting load transmitted from the steel tower to the steel tower foundation is supported by the support force of the steel tower foundation due to the earth pressure applied to the ridges of the component members, and the weight of the component members themselves and the weight of the concrete foundation. That is, when the eaves part has a larger area than the floor board of the concrete foundation, the earth pressure applied to the eaves part of the component member is increased corresponding to the load newly applied to the steel tower foundation. Therefore, the structural member can construct a steel tower foundation having a supporting force that efficiently supports an increasing lifting load by using a concrete foundation.

  Furthermore, a clearance gap is formed between the cylinder part by installing so that a cylinder part may surround the circumference | surroundings of a pillar body. By filling the gap with mortar, concrete, or the like, the cylindrical portion is bonded to the column. That is, the structural member is configured integrally with the concrete foundation. Therefore, even when a tipping moment is applied to the steel tower, the component acts integrally with the concrete foundation, and the concrete foundation can be used for steadying.

  As described above, according to the steel tower foundation constituent member and the steel tower foundation, and the construction method of the steel tower foundation according to the present invention, there is an excellent effect of having a supporting force capable of efficiently supporting an increasing lifting load.

The whole figure of the steel tower concerning a 1st embodiment of the present invention is shown. Explanatory drawing explaining the compression support force and lifting support force of a steel tower foundation is shown. The perspective view of the steel tower foundation which concerns on the same embodiment is shown. The longitudinal cross-sectional view of the steel tower foundation which concerns on the same embodiment is shown. It is a longitudinal cross-sectional view of the steel tower foundation which concerns on 2nd Embodiment of this invention. It is the cross-sectional view cut | disconnected by cutting line AA of FIG. 5 of the steel tower foundation which concerns on the same embodiment. It is a side view of the steel tower foundation which concerns on 3rd Embodiment of this invention. (A) is the cross-sectional view cut | disconnected by cutting line BB of FIG. 7 of the steel tower foundation which concerns on the same embodiment. (B) And (c) is an expanded side view of the supporting member of the structural member for steel tower foundations concerning the embodiment. The whole steel tower foundation perspective view concerning a 4th embodiment of the present invention is shown. The whole steel tower foundation perspective view concerning a 5th embodiment of the present invention is shown. The whole steel tower foundation perspective view concerning a 6th embodiment of the present invention is shown. The whole steel tower foundation perspective view concerning a 7th embodiment of the present invention is shown.

  The steel tower foundation according to the first embodiment of the present invention will be described with reference to FIGS. The steel tower foundations 1,... According to the embodiment are preferably applied when the load on the steel tower 90 is increased and the steel tower foundation 1 is reconstructed due to, for example, replacement work of a transmission line. The steel tower foundation 1 is a structure for supporting the steel tower 90 on the installation surface so that the steel tower 90 does not fall down. The steel tower 90 has four leg portions 91 at its lower part. The steel tower foundation 1 is provided for each of the four leg portions 91. The steel tower 90 is erected in the vertical direction, and each leg portion 91 is erected in a longitudinal direction A that is inclined inwardly (in a direction approaching other leg portions) from the vertical direction.

Here, before explaining the structure of each steel tower foundation 1,..., An example of calculation theory of the compression support force and the lift support force of the steel tower foundation will be described with reference to FIG. This calculation theory is based on “foundation design calculation formula-I (JEC-I formula)” in “JEC-127 Transmission Support Design Standard”. First, the compression support force is calculated by the following theoretical formula (see FIG. 2A).

The compressive load on the lower surface of the floor board is calculated by the following theoretical formula.

Further, the lifting support force of the steel tower foundation is calculated by the following theoretical formula (see FIG. 2B).

  Thus, if the area of the floor board 22 expands in the horizontal direction, the bottom area A of the floor board 22 and the soil volume VE effective for the lifting force increase, so that both the compression bearing capacity and the lifting bearing capacity of the tower foundation 1 increase. To do. However, the lifting support force of the tower foundation 1 is proportional to the volume of soil in the inverted head cone on the bottom surface of the floor plate 22, unlike the compression support force that increases in proportion to the soil volume VS directly above the floor plate 22. Since it increases, it can be said that the effect which expands the area of the floor board 22 is higher than compression support force.

  From here, the structure of the steel tower foundations 1,... Will be described with reference to FIGS. Each of the steel tower foundations 1,... Is for the concrete foundation 2 that supports the steel tower 90, and the steel tower foundation 1 that is provided in the steel tower 90 in order to newly support the load applied to the steel tower 90 after the concrete foundation 2 is constructed. The structural member 3 is provided. The steel tower foundation 1 is comprised by the structural member 3 using this concrete foundation 2. As shown in FIG.

  The concrete foundation 2 is a direct foundation for constructing a foundation slab by excavating the ground relatively shallowly and widely. The concrete foundation 2 is preferably a foundation type generally called an inverted T-shaped concrete foundation (or a footing foundation) because the shape of the longitudinal section is an inverted T-shape. The inverted T-shaped concrete foundation (hereinafter simply referred to as “concrete foundation”) 2 includes a column body 21 having a predetermined length in the longitudinal direction A of the leg portion 91 of the steel tower 90, and a lower portion of the column body 21. And a floor plate 22 provided. In general, concrete foundations have independent footing foundations in which a single floor supports a load from a single column, or composites in which a single floor supports a load from two or more columns. Examples include a footing foundation and a continuous footing foundation (or a cloth foundation) in which a load from a wall or a plurality of columns is supported by a belt-like floor board. The concrete foundation 2 which concerns on this embodiment demonstrates the example which is an independent footing foundation.

  The column 21 covers the concrete from the upper part to the lower part (excluding the upper end) of the leg part 91, and the outer shape is formed into a substantially prismatic shape (a truncated quadrangular pyramid shape). The column 21 is buried in the ground, leaving its upper part.

  The floor plate 22 is provided so as to intersect the column 21 at a predetermined angle. Specifically, the floor board 22 is a planar base having a predetermined height constructed so as to be horizontal to the ground surface. The floor plate 22 has a predetermined area in the horizontal direction from the column 21. The outer shape of the floor plate 22 has a top surface and a bottom surface formed in a square shape.

  In addition, the shape of this pillar 21 and the floor board 22 is an example of the concrete foundation 2 concerning this invention, and if it is other shapes (If it is the pillar 21, a truncated cone etc .. If it is the floor board 22, it will be rectangular or circular. (E.g. shape).

  The component member 3 includes a flange portion 4 having a predetermined area in a direction orthogonal to the longitudinal direction A of the column 21 and a connecting member 5 that connects the flange portion 4 to the leg portion 91 of the steel tower 90. The structural member 3 is manufactured with steel materials, and has the intensity | strength which does not deform | transform easily with the load concerning the steel tower foundation 1. FIG.

  The collar portion 4 is formed in an annular shape along the entire circumference of the column 21 (of a cross section intersecting the axial direction). The flange portion 4 includes an annular flange main body 41 having a size that extends to the outside of the floor surface 22, and a connecting portion 42 that connects the flange main body 41 to the connecting member 5.

  The flange main body 41 includes a plurality of divided bodies 43 divided in the circumferential direction of the columnar body 21 and coupling portions 44 that couple the divided bodies 43. In the present embodiment, the collar body 41 is formed by being equally divided into two in the circumferential direction T. In addition, the collar part main body 41 should just be splittable at the time of construction, and does not need to be separable after construction. That is, the buttocks main body 41 is divided from the time of manufacture, may be joined in a non-split manner by welding or the like at the time of construction, and may not be split after the construction.

  The flange main body 41 is formed in a size that can surround the columnar body 21 and the first outer edge 43a formed so as to have a larger area than the floor plate 22 in a direction intersecting with the columnar body 21. An inner second edge 43b and a third edge 43c that faces the other divided bodies 43 when the divided bodies 43 are coupled to each other.

  The first edge portion 43 a is formed so as to protrude outward from the top surface (or bottom surface) of the floor plate 22. In the present embodiment, the first edge portion 43 a is formed in a circular shape having a radius longer than the diagonal length of the floor plate 22. The 2nd edge 43b is formed in the cross-sectional shape of the horizontal direction of the pillar 21, and is formed in square shape in this embodiment. 2nd edge part 43b forms the opening which can surround the column 21 in the collar part main body 41 of the state which couple | bonded the division bodies 43 and .... The second edge 43 b is formed so that the center of the opening coincides with the center of the column 21. The third edge 43c is shaped by being divided along a straight line passing through the center of the flange main body 41 so as to equally divide the circumferential direction of the flange main body 41.

  The coupling portion 44 is formed along the third edge portion 43c so as to couple the third edge portion 43c of the one divided body 43 and the third edge portion 43c of the other divided body 43 together. An angle steel to be fixed (angle), and a bolt and a nut (not shown) for connecting the angle steels to each other are provided.

  The connecting portion 42 includes a first bolt hole 45 provided in an annular shape near the outer side of the second edge 43b, and a linear flange 46 provided in the radial direction from the first bolt hole 45. , And second bolt holes 47,... That are vacated in order to attach the collar body 41 to the floor plate 22. The first bolt hole 45 is provided to connect with the connecting means 5 without a gap. The flanges 46,... Are flanges provided to reinforce the collar body 41 by being connected to the connecting means 5. The second bolt holes 47 are provided for driving anchor bolts.

  The connecting member 5 includes a first connecting member 6 that is connected to the leg portion 91 of the steel tower 90, and a second connecting member 7 that connects the first connecting member 6 to the flange portion 4.

  The first connecting member 6 is connected to the upper end portion of the leg portion 91 of the steel tower 90 above the column body 21. That is, the first connecting member 6 is not connected so that a load is transmitted from the column 21, and is not connected so that a load is applied to the column 21.

  The first connecting member 6 is configured to be divided into a plurality of pieces in the circumferential direction of the leg portion 91. That is, the 1st connection member 6 is divided | segmented so that the said division | segmentation parts can be couple | bonded so that each division part may be surrounded from the radial direction of the leg part 91 with respect to the leg part 91. FIG. In this embodiment, the 1st connection member 6 is divided into 2 equally in the circumferential direction of the leg part 91, the 1st division body 61 and the 2nd division body 62, and this 1st division body 61 and the coupling | bond part 63 which couple | bonds the 2nd division body 62 with each other.

  The first divided body 61 transmits a load applied to the steel tower 90 from the first connecting part 61A to the second connecting member 7 from the first connecting part 61A connected to the upper end of the leg part 91 of the steel tower 90. Load transmission part 61B to be connected, and second connection part 61C to be connected to the second connection member 7.

  61 A of 1st connection parts are firmly fixed to the leg part 91 with a volt | bolt, a nut, etc. so that it may not fall off with the load concerning the leg part 91. FIG. 61 A of 1st connection parts are formed in cross-sectional shape L shape, and are connected facing the outer side of the leg part 91 assembled with angle iron.

  The load transmitting portion 61B is formed in a truncated quadrangular pyramid shape by combining with the load transmitting portion of the second divided body 62. The load transmitting portion 61B is composed of two adjacent surfaces of the truncated quadrangular pyramid shape. The load transmitting portion 61B is provided with a first connecting portion 61A on the top side of the quadrangular pyramid and a second connecting portion 61C on the bottom surface side. Therefore, the load transmission part 61B can disperse the load evenly from the first connecting part 61A to the second connecting part 7. Moreover, the load transmission part 61B is formed in the inclination angle which is not buckled by the load concerning the height direction of the said quadrangular pyramid shape.

  The second connecting portion 61 </ b> C is formed in a circular shape having an area connectable to the second connecting portion 7 by combining with the second connecting portion of the second divided body 62. The second connecting portion 61C is formed in a half of this circular shape, that is, in a semicircular shape.

  The second connecting portion 62 is the same as the first connecting portion 61 except that the first connecting portion 62A is connected to face the inner side (valley side) of the leg portion 91. The load transmission unit 62B and the second connection unit 62C are provided.

  The coupling part 63 is provided along the oblique sides (sides other than the top side and the bottom side) on both sides of the conical surfaces (inclined oblique slopes) of the load transmission parts 61B and 62B, and divides the second connection parts 61C and 61C. A flange provided along the side to be connected, a flange formed from the load transmitting portion 61B of the first divided body 61 to the second connecting portion 61C, and a second from the load transmitting portion 62B of the second divided body 62. Bolts and nuts for joining flanges formed over the connecting part 62C.

  The second connecting member 7 is formed along the longitudinal direction A of the column 21 from the leg portion 91 of the steel tower 90. The second connection member 7 has an installation surface (that is, a ground surface) on which the steel tower 90 is installed from a position where at least the first connection portions 61A and 62A of the first connection member 6 are connected to the leg portions 91 of the steel tower 90. It is formed so as to reach further downward. That is, the 2nd connection member 7 is provided in order to embed the collar part 4 by positioning the collar part 4 below the installation surface.

  The second connecting member 7 transmits the load applied to the leg portion 91 of the steel tower 90 to the flange portion 4 via the first connecting member 6. The second connecting member 7 includes a cylinder portion 71 that covers the column body 21, and a connection reinforcing member 72 that reinforces the connection between the cylinder portion 71 and the flange portion 4.

  The cylinder part 71 is formed in a hollow cylindrical shape on the inner side, and has an inner diameter in which the columnar body 21 is accommodated. Specifically, the cylinder portion 71 is formed in a hollow cone shape in which the cylinder core is inclined at the inclination angle of the column 21. The cylinder part 71 has a space in which the columnar body 21 can be covered.

  The cylinder part 71 is connected to the upper cylinder part 73 connected to the second connection parts 61C and 62C of the first connection member 6, and supports the flange part 4 at a predetermined embedding depth. The cylinder part main body 74 and the lower cylinder part 75 connected with the 1st bolt hole 45, ... of the collar part 4 are provided. Furthermore, the upper cylinder part 73, the cylinder part main body 74, and the lower cylinder part 75 are comprised from the some division body which can be divided | segmented into the circumferential direction T. FIG. In the present embodiment, the upper cylindrical portion 73, the cylindrical main body 74, and the lower cylindrical portion 75 are configured to be split into two. A flange is formed on the divided surface, and each divided body can be coupled. Moreover, the upper cylinder part 73, the cylinder part main body 74, and the lower cylinder part 75 are also formed with flanges at the upper end and the lower end, and can be connected to each other.

  The upper cylinder portion 73 is formed so that the upper surface of the cylinder body 71 is horizontal by adjusting the inclination of the upper surface of the cylinder body 74. The cylinder main body 74 is configured to be divided into a plurality of parts in the longitudinal direction according to the length in the longitudinal direction. The cylinder main body 74 according to the present embodiment is divided into three stages in the longitudinal direction. The lower cylinder part 75 is formed so that the lower surface becomes horizontal by adjusting the inclination of the cylinder part main body 74 and the flange part 4.

  The connection reinforcing member 72 is a first plate member 76 that is coupled to a rib formed on a side surface of the lower portion side of the cylindrical portion 71 (in this embodiment, the lower divided portion of the cylindrical portion main body 74 and the lower cylindrical portion 75). , Second plate members 77 that connect the first plate members 76 and the flange 46 of the flange portion 4, and bolts and nuts (not shown) that connect the first plate member 76 and the second plate member 77. .

  Next, a construction method of the tower foundation 1 according to the embodiment will be described with reference to FIGS. 3 and 4. In addition, the case where the load concerning the steel tower 90 increases and the existing steel tower foundation (concrete foundation 2) 1 is rebuilt is demonstrated to an example. That is, the steel tower foundation 1 is assumed that the steel tower 90 and the concrete foundation 2 are already constructed.

  First, it excavates to the top | upper surface of the floor surface 22 of the concrete foundation 2 (excavation process S1). In the excavation process S1, the collar part 4 is installed so as to intersect the longitudinal direction A of the pillar body 21 with the column body 21 and the top surface of the floor board 22 exposed (saddle part installation process S2). In the heel part installation step S <b> 2, the heel part 4 places the divided bodies 43,... On the top surface of the floor plate 22 so as to surround the column body 21, and couples the divided bodies 43, 43 with the coupling part 44. At this time, the collar portion 4 is placed so as to protrude outward from the top surface (or bottom surface) of the floor plate 22. Therefore, by installing this heel part 4, the slip surface (see FIG. 2) will be shifted outward from the slip surface formed by the floor board 22, and the soil weight effective for the lifting force will be increased. be able to. Further, the anchor bolt is inserted into the second bolt holes 47 of the flange main body 41 and the anchor bolt is driven into the floor plate 22. In this way, the collar part 4 is attached to the floor plate 22.

  After the heel portion installation step S2, the heel portion 4 is connected to the leg portion 91 of the steel tower 90 by the connecting member 5 (connection step S3). The connecting step S3 includes a first connecting step S3-1 for connecting the second connecting member 7 to the flange part 4 after the flange setting step S2, and a cylinder part 71 after the first connecting step S3-1. Closing step S3-2 for closing the gap between the column bodies 21 and second connecting step S3-3 for connecting the second connecting member 7 to the leg portion 91 of the steel tower 90 after the closing step S3-2. And comprising.

  In the first connecting step S 3-1, the divided body of the lower cylindrical portion 75 is placed in the first bolt hole 45 of the flange portion 4 so as to surround the column body 21 and is connected by a bolt (temporary assembly). Next, the divided body of the cylindrical portion main body 74 is placed on the upper portion of the lower cylindrical portion 75 so as to surround the column body 21, and is connected by bolts (temporary assembly). After all the divided parts of the cylindrical part main body 74 are connected, the divided part of the upper cylindrical part 73 is placed on the upper part of the cylindrical part main body 74 so as to surround the column 21 in the cylindrical part main body 74. Connect with (temporary assembly). And the 1st board | plate material 76, ... provided in the cylinder part main body 74 (this embodiment cylinder part main body of the lowest step), the 1st board | plate material 76, ... provided in the lower cylinder part 75, and the collar part 4 Are joined by second plate members 77,. When the second connecting member 7 is temporarily assembled, all bolts are finally tightened. Therefore, the connection reinforcing member 72 uniformly distributes the lifting load applied to the cylindrical portion 71 from the first edge portion 43a (outside) side of the flange main body 41 of the flange portion 4 to the third edge portion 43c (inside) side. Can be shared. In addition, a support material is applied to the first connecting member 7 as appropriate.

  The closing step S3-2 closes the gap by filling the gap formed between the inner peripheral surface of the cylindrical portion 71 and the column 21 with mortar or soil. In addition, it is not what couple | bonds so that the load concerning the leg part 91 of the steel tower 90 can be integrally supported by the concrete foundation 2 and the cylinder part 71 by filling this clearance gap with mortar or soil.

  In the second connecting step S3-3, the first divided body 61 and the second divided body 62 of the first connecting member 6 are formed on the cylindrical portion 71 of the second connecting member 7 so as to surround the leg portion 91. Mount and connect with bolts. And the 1st division body 61 and the 2nd division body 62 are couple | bonded by the coupling | bond part 63, and the 1st connection parts 61A and 62A of the 1st division body 61 and the 2nd division body 62 are used as the leg part 61. Connect to

  Finally, the construction of the steel tower foundation 1 is completed by backfilling the excavated hole (backfilling step S4).

  As described above, the load of the steel tower 90 that acts on the concrete foundation 2 from the leg portion 91 of the steel tower 90 also acts on the flange portion 4 via the connecting member 3 that is connected to the leg part 91 of the steel tower 90. The lifting load acting on the steel tower foundation 1 from the steel tower 90 is supported by the supporting force of the steel tower foundation 1 due to the earth pressure applied to the flange 4 of the component member 3, the weight of the component member 3 itself and the weight of the concrete foundation 2. The That is, since the eaves part 4 has a larger area than the floor plate 22 of the concrete foundation 2, the earth pressure applied to the eaves part 4 of the component member 3 is increased corresponding to the load newly applied to the tower foundation 1. It is. Therefore, the structural member 3 can construct the tower foundation 1 having a supporting force that efficiently supports the increasing lifting load by using the concrete foundation 2.

  Moreover, although the collar part 4 is arrange | positioned so that the pillar 21 may be enclosed, the structural member 3 constructs the pillar 21, and after supporting the leg part 91 of the steel tower 90 to the said pillar 21, the collar 4 The construction which installs can be done.

  Moreover, a gap is formed between the cylindrical portion 71 and the column body 21 by being installed so as to surround the column body 21. By filling the gap with mortar, concrete, or the like, the cylindrical portion 71 is bonded to the column 21. That is, the component 3 is configured integrally with the concrete foundation 2. Therefore, even when a falling moment is applied to the steel tower 90, the component 3 acts integrally with the concrete foundation 2, and the concrete foundation 2 can be used for steadying.

  Moreover, since the cylinder part 71 can be divided | segmented into the circumferential direction, the structural member 3 is the construction which installs the cylinder part 71, even after constructing the pillar 21 and supporting the leg part 91 of the steel tower 90 to the said pillar 21. Can be constructed.

  Next, a steel tower foundation according to a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In addition, the steel tower foundation 100 which concerns on the same embodiment is a modification of the lower cylinder part 75 of the 2nd connection member 7 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the tower foundation 100 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The lower cylindrical portion 175 of the second connecting member 107 according to the embodiment is provided with an inner cylindrical portion 175A connected to the lower end of the cylindrical portion main body 74 and an outer side of the inner cylindrical portion 175A. The outer cylinder part 175B connected with the flange 46, and the connection part 175C which connects the inner cylinder part 175A and the outer cylinder part 175B are provided.

  The inner cylindrical portion 175A is formed in the same shape as the cylindrical main body 74, that is, the height in the vertical direction is constant. The inner cylinder portion 175A includes a flange along the vertical direction. Therefore, the inner cylindrical portion 175A is connected to the outer cylindrical portion 175B via the connecting portion 175C using the flange. The inner cylindrical portion 175A is held in an inclined state at the inclination angle of the column 21. That is, the inner cylinder portion 175A has a gap with the flange main body 41, and is thus not connected to the flange main body 41.

  The outer cylindrical portion 175B has a diameter that can surround the inner cylindrical portion 175A inside. The outer cylinder portion 175 </ b> B includes a flange at the lower end thereof in order to be coupled to the first bolt hole 45 of the flange portion 4.

  The connecting part 175C is passed between the inner cylinder part 175A and the outer cylinder part 175B in order to connect the inner cylinder part 175A to the outer cylinder part 175B while being inclined at the inclination angle of the column 21. The connecting part 175C connects the inner cylinder part 175A and the outer cylinder part 175B at a plurality of locations. The connecting portion 175C is a plate-like member, and one end is fixed to the inner peripheral surface of the outer cylindrical portion 175B, and a flange that can be connected to the flange on the outer peripheral surface of the inner cylindrical portion 175A is formed. . The other end of the connecting portion 175C is inclined at the same angle as the inclination angle of the inner cylindrical portion 175A. The connecting part 175C is fixed inside the outer cylinder part 175B in accordance with the height at which the other end is connected to the flange of the inner cylinder part 175A. The flange provided at the other end of the connecting portion 175C is provided with an elongated bolt hole.

  In the steel tower foundation 100 according to the embodiment, in the connecting step S3, first, the outer cylindrical portion 175B is connected to the flange portion 4, and the inner cylindrical portion 175A is connected to the connecting portion 175C fixed to the inner peripheral surface of the outer flange portion 175B. Link. Therefore, the lower cylindrical portion 175 can be connected to the flange portion 4 at the inclination angle of the column body 21.

  By doing in this way, by forming the shape of the connecting portion 175C and the height to be fixed to the inner cylindrical portion 175A in accordance with the inclination angle of the column 21 different for each leg portion 91 of the steel tower 90, other members are formed. Can be used in common for the legs 91 of any inclination angle.

  Moreover, after the lower cylinder part 175 is connected with the collar part 4, it can be made to adhere to the concrete foundation 2 by filling the inside of the outer cylinder part 175B with the mortar, and can be used for steadying.

  Next, a steel tower foundation according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the steel tower foundation 200 which concerns on the same embodiment is a modification of the lower cylinder part 75 of the 2nd connection member 7 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the steel tower foundation 200 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The lower cylindrical part 275 of the second connecting member 207 according to the embodiment is formed in the same shape as the cylindrical part main body 74, that is, the lower cylindrical part main body 275A in which the height in the vertical direction is constant, The lower cylindrical portion main body 275A is inclined at the inclination angle of the column 21 and supported, and the second plate member 77 of the connection reinforcing member 72 and the flange 46 of the flange portion 4 are adjusted in accordance with the second gap. A connecting portion 175 </ b> C that connects the plate member 77 and the flange 46.

  The lower cylindrical portion main body 275A is held in an inclined state at the inclination angle of the column 21. A flange is formed at the lower end of the lower cylindrical portion main body 275A, and the support member 275A can be connected to an arbitrary place with a bolt. That is, the lower cylinder body 275 </ b> A has a gap between it and the collar body 41.

  As shown in FIGS. 8B and 8C, the support member 275B includes a placement portion 275D that places and supports the lower end of the lower cylindrical portion main body 275A, and a support portion 275E that supports the placement portion 275D. , And a bottom portion 275F fixed to the flange portion 4. The placement portion 275D is inclined according to the inclination angle of the lower cylindrical portion main body 275A. The mounting portion 275D includes a bolt hole that can be connected to the lower cylindrical portion main body 275A, and is connected to the lower cylindrical portion main body 275A by bolts and nuts. The support portion 275E supports the placement portion 275D so that the height of the placement portion 275D is a gap between the lower cylindrical portion main body 275A and the flange portion 4. The bottom portion 275F includes a bolt hole that can be connected to the flange portion 4, and is connected to the flange portion 4 with bolts and nuts.

  The connecting portion 275 </ b> C is a plate-like member for connecting the second plate member 77 of the connecting reinforcing member 72 and the flange 46 of the flange portion 4. The connecting portion 275C has a bolt hole (not shown) capable of connecting the flange 46 at one end, and a connecting hole 275G provided at the other end according to the position of the bolt hole formed in the second plate member 77. Have.

  In the steel tower foundation 200 according to the embodiment, in the connecting step S3, first, the lower cylindrical portion main body 275A is installed, the support member 275B is installed in the gap between the lower end of the lower cylindrical portion main body 275A and the flange portion 4, and the lower cylindrical portion It connects with the lower end of the main part 275A and the collar part 4. Further, the second plate member 77 is connected to the ribs fixed in the vertical direction of the lower cylindrical portion main body 275A, and the second plate member 77 and the flange portion 4 are connected by the connecting portion 275C. Therefore, the lower cylinder portion 275 can be connected to the flange portion 4 at the inclination angle of the column body 21.

  By doing in this way, the height and inclination angle of the mounting portion 275D of the support member 275B, and the position of the connection hole 275G of the connection portion 275C are set to the inclination angle of the column 21 different for each leg portion 91 of the steel tower 90. By forming them together, other members can be used in common for the legs 91 of any inclination angle.

  Next, a steel tower foundation according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the steel tower foundation 300 which concerns on the same embodiment is a modification of the lower cylinder part 75 of the 2nd connection member 7 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the tower foundation 300 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The lower cylindrical portion 375 of the second connecting member 307 according to the embodiment is formed integrally with the cylindrical portion main body 74 (the lowermost divided body thereof). By doing in this way, a number of parts can be reduced and the work man-hour at the field can be reduced.

  Next, a steel tower foundation according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the steel tower foundation 400 which concerns on the same embodiment is a modification of the collar part 4 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the steel tower foundation 400 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The collar body 441 (parts 443,...) Of the collar 404 according to the embodiment is formed such that the first edge 443a is inclined upward toward the outside. Therefore, the heel part main body 441 can reliably capture the soil on the upper surface, and can more reliably ensure the weight of the soil effective for the lifting force.

  In addition, the flange main body 441 has a second edge 443 b formed in a cylindrical shape along the peripheral surface of the lower cylindrical portion 75 of the second connecting member 7. Therefore, the heel part main body 441 can adjust the embedment depth by the position where it is connected to the peripheral surface of the lower cylinder part 75.

  Next, a steel tower foundation according to a sixth embodiment of the present invention will be described with reference to FIG. In addition, the steel tower foundation 500 which concerns on the same embodiment is a modification of the collar part 4 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the tower foundation 500 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The collar part 504 according to the embodiment further includes a storage part 543 that can be filled with soil, concrete, or the like on the lower surface of the collar body 41. The storage unit 543 can increase the weight of the steel tower foundation 500 by filling the interior thereof with soil, concrete, or the like, and can increase the weight of soil effective for the lifting force.

  Next, a steel tower foundation according to a seventh embodiment of the present invention will be described with reference to FIG. In addition, the steel tower foundation 600 which concerns on the same embodiment is a modification of the collar part 4 which concerns on 1st Embodiment. Therefore, about the same structure as the tower foundation 100 which concerns on 1st Embodiment, the tower foundation 600 which concerns on the same embodiment uses the same code | symbol, and abbreviate | omits the description.

  The flange portion 604 according to the embodiment is formed radially from the lower cylindrical portion 75 to the outside of the floor plate 22. The flange portion 604 includes a first flange portion 641 and a second flange portion 642 that are attached to the middle portion in the longitudinal direction of the lower cylindrical portion 75 in a two-layer structure, and an outer side of the first flange portion 641 and the second flange portion 642. A support portion 643 that supports the edges in the vertical direction.

  The first flange portion 641 and the second flange portion 642 have a plurality of rod-like members 641A, 642A,... That connect one end to the lower cylindrical portion 75, and a support ring 641B that supports the other ends of the rod-like members 641A, 642A,. , 642B. Also by configuring in this way, the heel portion 604 can catch soil on the upper surface thereof, and thus the lifting support force can be increased while reducing the weight of the heel portion 604 itself.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  Although the reinforcement member and foundation structure for steel tower foundations and the reinforcing method according to the first to seventh embodiments of the present invention have been described as examples of reinforcing an existing steel tower foundation, the present invention is not limited thereto. For example, the reinforcing member for a steel tower foundation according to the present invention may be provided from when a steel tower is newly installed.

  Although the reinforcing member and the foundation structure for the steel tower foundation and the reinforcing method according to the first to seventh embodiments of the present invention have been described as examples in which the steel tower 90 is a power transmission tower on which a transmission line is installed, the invention is not limited thereto. It is not something. For example, steel towers to which the present invention can be applied include a wind turbine body (tower) of a wind power generation facility, a base station (such as a steel tower) such as a mobile phone, a radio wave transmission tower such as a television or a radio. In these steel towers, the load applied to the foundation may increase due to an increase in equipment capacity. The reinforcing member and foundation structure for a steel tower foundation and the reinforcing method according to the present invention can be applied even when such a situation exists.

  In the steel tower foundation according to the first to seventh embodiments of the present invention, the example in which the second connecting members 7, 107, 207, and 307 are cylindrical tube portions has been described. However, the present invention is not limited to this. . That is, the second connecting member may have any shape as long as it can cover the circumferential direction T of the column over the entire circumference. For example, the second connecting member may be a hollow (elliptical) cylinder, a hollow truncated cone, or a square tube having an opening capable of accommodating a column. Therefore, the 2nd connection member can be filled with a mortar etc. in the clearance gap between the pillars stored in this opening, and can adhere to a pillar. That is, the second connecting member can use the concrete foundation for steadying.

  The tower foundation according to the first to seventh embodiments of the present invention is an example in which the second connecting members 7, 107, 207, 307 are cylindrical portions 71, 175, 275, 375 covering the entire circumference of the column 21. Although described, the present invention is not limited to this. In other words, the second connecting member can connect the flange portion to the leg portion 91 of the tower 90 via the first connecting member, and can transmit the load related to the leg portion 91 to the flange portion. Such a shape may be used. In other words, the second connecting member may be a plurality of rod-like members that connect the first connecting member and the flange along the column 21.

  The steel tower foundation according to the first to seventh embodiments of the present invention is an example in which the flanges 4, 404, 504, 604 are extended from the lower ends of the cylindrical parts 71, 175, 275, 375 to the outside of the floor plate 22. Although described, the present invention is not limited to this. For example, the flange may have any shape as long as it has a larger area than the floor plate 22 in the direction intersecting the column 21. Specifically, a part of the collar portion may extend to the outside of the floor board. The collar portion may be provided at any position in the longitudinal direction with respect to the tubular portion. It is preferable that the eaves part is extended outside the sliding surface (see FIG. 2) formed by the floor board, and further, the embedding depth and the pillar increase more than the weight of the soil effective for the lifting force by the floor board. It is preferable to have a large area in the direction intersecting the body. In addition, in this embodiment, the position of the slip surface is a value according to “foundation design calculation formula-I (JEC-I formula)” of “JEC-127 Transmission Support Design Standard”, but is not limited thereto. It is not a thing. For example, the collar portion may extend outward from a slip surface calculated based on another calculation theory.

  DESCRIPTION OF SYMBOLS 1 ... Steel tower foundation, 2 ... Concrete foundation, 21 ... Column body, 22 ... Floor board, 3 ... Constituent member, 4 ... Ridge part, 41 ... Ridge body, 42 ... Connection part, 43 ... Divided body, 43a ... 1st Edge, 43b ... Second edge, 44c ... Third edge, 44 ... Coupling portion, 45 ... First bolt hole, 46 ... Flange, 47 ... Second bolt hole, 5 ... Connecting member, 6 ... 1st connection member, 61 ... 1st division body, 61A ... 1st connection part, 61B ... Load transmission part, 61C ... 2nd connection part, 62 ... 2nd division body, 62A ... 1st Connection part, 62B ... Load transmission part, 62C ... Second connection part, 63 ... Coupling part, 7 ... Second connection member, 71 ... Tube part, 72 ... Connection reinforcement member, 73 ... Upper cylinder part, 74 ... Tube Part main body, 75 ... lower cylindrical part, 76 ... first plate material, 77 ... second plate material, 90 ... steel tower, 91 ... leg part, 100 ... steel tower foundation, 107 ... first 2 connection members, 175 ... lower cylinder part, 175A ... inner cylinder part, 175B ... outer cylinder part, 175C ... connection part, 200 ... steel tower foundation, 207 ... second connection member, 275 ... lower cylinder part, 275A ... lower part Tube portion main body, 275B ... support member, 275C ... connecting portion, 275D ... mounting portion, 275E ... support portion, 275F ... bottom portion, 275G ... connecting hole, 300 ... tower foundation, 307 ... second connecting member, 375 ... lower portion Tube portion 400 ... Steel tower foundation 404 ... Steel tower foundation 500 ... Steel tower foundation 504 ... Steel tower foundation 543 ... Storage part 600 ... Steel tower foundation 604 ... Steel bowl part 641 ... First steel part 641A ... Rod-shaped member, 641B ... support ring, 642 ... second collar, 642A ... rod-like member, 642B ... support ring, 643 ... support, A ... longitudinal direction, S1 ... excavation process, S2 ... saddle installation process, S3 ... connection process, S3 -1 ... First coupling step, S3-2 ... blocking step, S3-3 ... second connecting step, S4 ... refilling step

Claims (8)

In the component for the steel tower foundation provided on the concrete foundation that supports the lower part of the leg of the steel tower,
The concrete foundation includes a column having a predetermined length in the longitudinal direction of the legs, and a floor plate provided at a lower part of the column,
A structural member for a tower foundation, comprising: a collar part having an area wider than the floor plate in a direction intersecting with the column body; and a connecting member for coupling the collar part to a leg part of the tower.   2. The structure for a steel tower foundation according to claim 1, wherein the flange portion is formed in a ring shape along the entire circumference of the column body and is configured by a plurality of divided bodies that can be divided in the circumferential direction of the column body. Element.   The said connecting member is provided with the 1st connecting member connected with the leg part of the said steel tower, and the 2nd connecting member which connects this 1st connecting member with the said collar part, The Claim 1 or 2 Components for steel tower foundation.   The said 2nd connection member is a structural member for steel tower foundations of Claim 3 provided with the cylinder part which covers the said pillar.   The said cylinder part is a structural member for tower foundations of Claim 4 comprised from the some division body which can be divided | segmented into the circumferential direction.   A column having a predetermined length in the longitudinal direction of the leg, a floor plate provided at a lower portion of the column, and the constituent member according to any one of claims 1 to 5. Characteristic steel tower foundation. A construction method of a steel tower foundation using the structural member for a steel tower foundation according to any one of claims 1 to 5,
A steel tower comprising: a hook part installation step of installing the hook part so as to intersect the longitudinal direction of the column body; and a connecting step of connecting the hook part to a leg part of the tower with the connecting member. Foundation construction method. A construction method of a steel tower foundation using the steel tower foundation constituent member according to claim 4 or 5,
A hook part installation step of installing the hook part so as to intersect the longitudinal direction of the column body, a first connection step of connecting the second connecting member to the hook part after the hook part installation step, A closing step of closing the gap between the cylindrical portion and the column body after the first connecting step, and a second connecting step of connecting the first connecting member to the legs of the steel tower after the closing step. The construction method of the steel tower foundation characterized by comprising.

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