JP5238063B2 - Steel tower lift-up method - Google Patents

Description

  The present invention relates to a lift-up method using a steel tower lift-up device, and is particularly effectively applied to a steel pipe single-column steel tower such as an environmentally conscious steel tower when the foundation surface is extremely narrow in a narrow area.

  The construction of a single-pillar power transmission tower employs a lift-up method that can construct a steel tower from the top to the bottom near the ground (see, for example, Patent Document 1).

  The invention of this Patent Document 1 is a construction method and apparatus capable of safely and quickly constructing a steel tower under an existing steel tower wire. A guide tower of a lift-up device having a required height is erected on the steel tower foundation surface, The lower part of the guide tower was fixed to the foundation concrete around the column base via anchor bolts, and the foundation reaction force of the guide tower (reaction force of lift-up device work load) was transmitted to the tower foundation.

  In addition, regarding the foundation of the steel tower, in Patent Document 2, in the steel tower foundation constructed by joining the pile material and the steel tower leg by concrete casting, a protruding member for supporting concrete on the steel tower foot A cylindrical member that restrains the periphery of the steel tower legs and the cast concrete, and an engagement member that engages the cast concrete is formed on the inner wall of the tubular member, thereby improving the restraint of the filled concrete and splitting. A steel tower foundation that can dramatically improve fixing strength by suppressing breakage is disclosed.

Japanese Examined Patent Publication No. 2-13115 JP 2004-285737 A

  When the construction site of the steel tower is narrow, such as a narrow median between the roadway and the roadway, the tower base must be made smaller, and the guide tower of the lift-up device is secured to the foundation surface of the tower with anchor bolts. In the conventional method, the anchor bolt protrudes from the steel tower base surface and the lift-up device cannot be fixed, so that the lift-up method cannot be used for construction.

  The present invention is intended to solve the problems as described above, and the lift-up device can be reliably installed even in a site where the site of the steel tower construction is narrow and the anchor bolt for the lift-up device cannot be installed. It aims at providing the lift-up method of the steel tower which can construct a steel tower by the lift-up method.

  The invention according to claim 1 of the present invention relates to a lift-up method for a steel tower in which the tower body is lifted up by a lift-up device arranged on the base surface of the steel tower to construct the steel tower from the upper part to the lower part near the ground. The bottom tower of the tower that protrudes from the foundation to the ground is installed, and a support frame that supports the guide tower of the lift-up device is attached to the upper part of the bottom tower at a predetermined distance above the foundation of the tower. The basic reaction force of the guide tower is transmitted to the tower base of the lowermost tower through the support frame, and the unit tower is carried into the guide tower, and the unit tower in the guide tower It is a lift-up method of a steel tower characterized in that the steel tower is constructed from the upper part to the lower part above the lowermost tower body by sequentially repeating the lift-up by the body lift-up mechanism.

  The present invention enables the lift-up method even in confined areas or on steel towers with confined steel pipe foundations that have recently been employed. As illustrated in FIGS. 1 and 2, the support gantry has a ring plate fixed to the upper part of the lowermost tower body by welding or the like at a predetermined distance from the steel tower base surface, and extends radially from the ring plate. It is preferable that the base end portion of the support beam be joined to the ring plate with a bolt or the like. The tip portions of the support beams are connected and integrated by a connecting member, and the pillar members of the guide tower are flange-bolt joined to the support columns provided at the tip portions of the support beams.

  The lift-up mechanism of the lift-up device can use various types of devices such as a mechanism that lifts up and down the guide ring that holds the tower body with a hydraulic jack, and has been carried into the guide tower. After the upper unit tower is lifted up and the lower unit tower is brought in and connected to the lower unit tower, the lifting operation is sequentially repeated to build the steel tower from the upper part to the lower part near the ground. When the upper tower is assembled from the lowermost tower, the lower end is joined to the upper end of the lowermost tower to complete the steel tower.

  In the present invention, by attaching the support frame as described above, the foundation reaction force of the guide tower of the lift-up device (the reaction force of the lift-up device work load) is transferred to the tower foundation of the lowermost tower body via the support frame. Since the conventional anchor bolt is not required and there is only a space where the lowermost tower can be embedded, the lift-up method can be performed even in a narrow area.

  The invention according to claim 2 of the present invention is the tower lift-up method according to claim 1, wherein the tower base is inserted into the cylindrical member placed in the ground with the lower part of the lowermost tower body. And it is the lift-up method of the steel tower characterized by being filled with concrete.

  As illustrated in FIG. 1, a restraint steel pipe foundation is used for a steel tower foundation, and a restraint steel pipe having an engagement protrusion (slipping prevention) on the inner peripheral surface is wound around the tower foundation concrete, and the innermost part thereof is wound inside. By fixing the lower tower body, it is possible to improve the restraint of the concrete to prevent split fracture and to obtain a steel tower foundation with dramatically improved fixing strength. Moreover, it is a compact foundation in which the lowermost tower body is inserted into the restraint steel pipe, and a steel tower foundation can be constructed in a confined area.

  The invention according to Claim 3 of the present invention is the tower lift-up method according to any one of Claims 1 and 2, wherein the steel tower is installed under the existing steel tower electric wire, and a brace is provided on the upper part. This is a single-pillar steel tower. At the top of the lift-up device, a brace is attached to the tower so that it is parallel to the existing overhead wire. After the tower is lifted up, the upper tower is turned 90 degrees horizontally from the bottom tower. This is a steel tower lift-up method characterized in that the brace is made perpendicular to the existing overhead wire to complete the construction of the steel tower.

  This is the case where the tower is lifted up under the existing steel tower wire. When the upper tower is assembled from the bottom tower, the tower is turned 90 degrees horizontally, and the armature lifts the tower perpendicular to the existing overhead wire. The tower is completed by joining the lower end to the upper end of the lowermost tower. By raising the armature parallel to the existing overhead wire between the existing constructions, the steel tower can be assembled even in a live wire state, and the power stop period can be shortened as much as possible.

(1) Since the support frame that supports the guide tower of the lift-up device is attached to the upper part of the bottom tower of the tower foundation at a predetermined distance from the tower foundation surface, the foundation reaction force of the guide tower Can be transmitted to the tower base of the lowermost tower through the support frame, and the conventional anchor bolts are not required, and there is only a space where the lowermost tower can be embedded. Up construction method is possible.

(2) By using a confined steel pipe foundation for the steel tower foundation, a steel tower foundation with significantly improved anchorage strength can be obtained, and it is a compact foundation in which the lowest tower is inserted into the confined steel pipe. In addition, it is possible to construct a steel tower foundation and to lift up in a confined area.

(3) At the top of the lift-up device, attach a brace to the tower so that it is parallel to the existing overhead line. After the tower is lifted up, turn the upper tower horizontally 90 degrees from the bottom tower to By making gold orthogonal to the existing overhead wire, the steel tower can be assembled even in a live wire state, and the power outage period can be shortened as much as possible.

It is a vertical sectional view showing an example of a lower part of a lift-up device used in the lift-up method of the present invention and a steel tower foundation. It is a horizontal sectional view of FIG. It is a side view which shows an example of the lift-up apparatus used by this invention. It is a vertical sectional view (process 1-6) which shows the lift up construction method of the present invention in order of a process. It is the vertical sectional view (process 7-10) which shows the lift up construction method of the present invention in order of a process.

  Hereinafter, the present invention will be described based on the illustrated embodiments. This embodiment is an example of assembling a steel pipe single column tower in a narrow area. 1 and 2 are a vertical sectional view and a horizontal sectional view showing an example of a lower part of a lift-up device used in the lift-up method of the present invention and a steel tower foundation part. FIG. 3 is a side view showing an example of a lift-up device used in the present invention. 4 and 5 are vertical sectional views showing the lift-up method of the present invention in the order of steps.

  In FIG. 1, the place where the steel pipe single column tower 1 such as an environmental harmony tower is installed is a narrow area such as a central separation zone B sandwiched between the roadway A and the roadway A, and the steel tower base plane GL is extremely narrow. Therefore, when the guide tower 21 of the lift-up device 20 is fixed, the conventional anchor bolt system cannot be used because the anchor bolt protrudes from the roadway.

  Therefore, in the present invention, a constrained steel pipe foundation is used for the steel tower foundation 2, and the lower part of the lowermost tower body 1A constituting the lowermost part of the steel tower 1 is inserted into the constraining steel pipe 3 constituting the upper part of the pile, and the concrete 4 To be integrated. A support frame 10 that supports the guide tower 21 is attached to the upper part of the lowermost tower 1A in a floating state at a predetermined distance from the ground, that is, the steel tower foundation surface GL, and the base reaction force of the guide tower 21 is applied to the support frame 10. Therefore, the lift-up device 20 can be installed even in a confined area by transmitting it to the tower base (the steel tower base 2) of the lowermost tower 1A.

  As shown in FIG. 1, the constrained steel pipe 3 is placed in a buried state in the ground, and a large number of engaging projections 5 that engage with the concrete 4 are provided on the inner peripheral surface thereof, and the lower outer periphery of the lowermost tower 1A The surface is provided with a supporting member 6 by a number of protrusions that support the concrete 4. By winding the restraint steel pipe 3 with the engagement protrusion 5 around the tower base concrete, and fixing the lowermost tower body 1A inside thereof, the restraint of the concrete 4 can be improved and split fracture can be prevented. A steel tower foundation with significantly improved fixing strength can be obtained. Moreover, it is the compact foundation which inserts the lowermost tower body 1A in the restraint steel pipe 3, and a steel tower foundation can be constructed in a narrow area. The lowermost tower 1A is finally covered with anticorrosive concrete 40 as shown by a two-dot chain line in FIG.

  As shown in FIGS. 1 and 2, the support frame 10 includes a ring plate 11 that is fixed to the tower body 1 </ b> A by welding or the like in a shape that surrounds the lowermost tower body 1 </ b> A, and horizontally extends outward from the ring plate 11. A plurality of (four in the illustrated example) radially extending support beams 12 and a connecting member 13 that connects the tip portions of the support beams 12 are configured.

  The ring plate 11 is composed of two upper and lower annular plates 11a, 11a arranged horizontally with an interval in the vertical direction, and the inner peripheral surface thereof is fixed to the outer peripheral surface of the lowermost tower 1A by welding or the like. The The support beam 12 is made of H-shaped steel, and the upper and lower flanges 12a and 12a thereof are bolted to the annular plates 11a and 11a via joint plates 14, respectively.

  A support column 15 to which the lower end portion of the column member 22 of the guide tower 21 is connected is provided at the distal end portion of the support beam 12. In the illustrated example, a short support column 16 is provided as a pedestal on the upper flange 12a of the distal end portion of the support beam 12, and a lower end flange 22a of a column member 22 is bolted to the upper flange 16a. The upper and lower flanges 12 a, the upper flange 16 a, and the lower end flange 22 a in the support portion are reinforced with vertical ribs 17 and triangular stiffeners 18.

The connecting member 13 is made of I-shaped steel, and the upper and lower flanges 13 a and 13 a are bolted to the upper and lower flanges 12 a and 12 a at the tip of the support beam 12 via a joint plate 19.
In the illustrated example, four cantilevered support beams 12 are integrated by four connecting members 13, and a rectangular support frame 10 is formed in plan view corresponding to the horizontal sectional shape of the guide tower 21.

Note that tower shown in FIG. 1 is a state where the lift-up has been completed for all the unit tower body, the lower end of the unit tower body 1U _N bottom joined to the upper end of the bottom tower body 1A, the temporary Election The adjustment is made with the piece 50 and the bolt 51. After the adjustment, the erection piece 50 is removed and main joining is performed by welding or the like.

  As the lift-up device 20, for example, the device shown in FIG. 3 can be used. The lift-up device 20 moves up and down using a guide tower 21 configured by connecting the column member 22 with a horizontal member 23 or a brace material 24, and a guide rail disposed along the inside of each column member 22 as a guide. The upper guide ring 25 and the lower guide ring 26 that are freely supported and can hold the unit tower 1U, the suspension beam 27 that connects the guide rings 25 and 26, and the horizontal member 23 are suspended. It comprises a hydraulic jack 28 or the like that can move the beam 27 up and down.

  The upper and lower guide rings 25 and 26 are divided into two parts, arranged so as to surround each divided body in the unit tower body 1U carried into the guide tower 21, and hold the unit tower body 1U. The body 1U and the upper and lower guide rings 25 and 26 are fixed. Guide rollers and the like are provided on the outer peripheral portions of the upper and lower guide rings 25 and 26. The lower end of the suspension beam 27 is connected to the lower guide ring 26, and the held unit tower 1 </ b> U can be lifted up by pulling up the upper portion of the suspension beam 27 with the hydraulic jack 28.

  The lifting beam 27 is pulled up by, for example, a measuring method using insertion holes formed in the hanging beam 27 at a predetermined pitch in the longitudinal direction and locking pins provided above and below the hydraulic jack 28, respectively. By inserting the upper locking pin into the insertion hole, extending the hydraulic jack, raising the suspension beam, inserting the lower locking into the insertion hole, contracting the hydraulic jack, and repeating this operation, the suspension beam 27. The upper and lower guide rings 25 and 26 can be raised by a measuring method.

  In addition, a pair of carry-in rails 30 is installed at the lower part of the guide tower 21 so as to sandwich the upper end of the lowermost tower 1A and to extend sideways from the inside. A tower carrying truck 31 is arranged in the middle. In the case of the median strip B shown in FIG. 1, the carry-in rail 30 and the tower-carriage carriage 31 can be installed on the median strip B.

  In the above configuration, the tower is lifted up in the following procedure (see FIGS. 4 and 5). In addition, this construction example is a case where a steel tower is constructed under the existing steel tower electric wire.

(1) Step 1: The lower part of the lowermost tower body 1A of the steel tower is inserted into the constrained steel pipe 3 embedded in the ground of the median strip B, and the concrete 4 is filled to form the steel tower base 2.

(2) Step 2: The support frame 10 is attached to the upper part of the lowermost tower body 1A in a floating state with a predetermined distance from the ground, that is, the steel tower base surface GL.

(3) Step 3: Most of the guide tower 21 of the lift-up device 20 is assembled on the support frame 10 with a crane. In the guide tower 21, an upper guide ring 25, a lower guide ring 26, a suspension beam 27, a hydraulic jack 28, a carry-in rail 30, a tower carrying cart 31, and the like are installed.

(4) Step 4: The first section 1U ₁ to the third section 1U ₃ of the unit tower constituting the upper part of the steel tower are suspended in the guide tower 21 by a crane and assembled.

(5) Step 5: Assemble the remaining upper part of the guide tower 21. Upper and lower guide rings 25 and 26 are fixed to the first section 1U ₁ to the third section 1U ₃ , and the hydraulic jack 28 is operated from this state to operate the upper and lower guide rings 25 and 26 and the first section 1U ₁ to the first section 1U ₁ to the first section 1U ₃ . Raise 3 verses 1U ₃ by a measuring method.

(6) Step 6: Lifting is continued until a space in which the next fourth section 1U ₄ can be inserted is formed between the lowermost tower 1A and the third section 1U ₃ . After the lift-up is completed, the hydraulic jack 28 is replaced with the upper horizontal member 23. Next, the fourth node 1U ₄ placed on the tower carrying truck 31 is carried under the third node 1U ₃ .

(7) Step 7: The first joint 1U ₁ to the third joint 1U ₃ are lifted down and joined to the fourth joint 1U ₄ . The armature mounting portion 7 is provided in advance in the tower body 1U, and the armrest 8 is attached to the upper portion of the guide tower 21. The brace 8 is attached so as to be parallel to the longitudinal direction of the central separation band B, that is, the direction of the existing overhead wire.

(8) Step 8: The hydraulic jack 28 is replaced with the lower horizontal member 23. The above-described operations such as lifting up the unit tower 1U and carrying in / connecting the next unit tower 1U are sequentially repeated to assemble the steel tower 1 from the upper part to the lower part. After the lift-up is completed, the arm bracket 8 is disposed in the upper part of the steel tower 1 in parallel with the existing overhead wire. So that the existing overhead wire can be attached.

(9) Step 9: The tower body carrying carriage 31 is carried out to the side, the entire tower body is lifted down, joined to the lowermost tower body 1A, and after the adjustment of the building, the main joining is performed.

(10) Step 10: The lift-up device 10 is removed, and the tower 1 is completed.

  Needless to say, the present invention is not limited to the illustrated examples.

A ... Roadway B ... Median strip (narrow area)
DESCRIPTION OF SYMBOLS 1 ... Steel tower 1A ... Lowermost tower body 1U ... Unit tower body 2 ... Steel tower base part 3 ... Restraint steel pipe 4 ... Concrete 5 ... Engagement protrusion 6 ... Supporting member 7 ... Arm metal mounting part 8 ... Arm metal 10 ... Support stand DESCRIPTION OF SYMBOLS 11 ... Ring plate 11a ... Ring plate 12 ... Support beam 12a ... Flange 13 ... Connecting member 13a ... Flange 14 ... Joint plate 15 ... Support column 16 ... Support column 17 ... Vertical rib 18 ... Triangular stiffener 19 ... Joint plate 20 ... Lift UP device 21 ... guide tower 22 ... column member 23 ... horizontal member 24 ... brace material 25 ... upper guide ring 26 ... lower guide ring 27 ... hanging beam 28 ... hydraulic jack 30 ... loading rail 31 ... tower loading cart 40 ... anticorrosive concrete 50 ... Erection piece 51 ... Bolt

Claims (3)

  In the lift-up method of a steel tower, where the tower is lifted up by a lift-up device placed on the steel tower foundation surface and constructed from the top to the bottom near the ground, the lowest part of the steel tower protruding from the steel tower base to the ground A tower body is installed, and a support frame for supporting the guide tower of the lift-up device is attached to the upper part of the lowermost tower body at a predetermined distance from the steel tower foundation surface, and the base reaction force of the guide tower is supported. It is transmitted to the tower base of the lowermost tower body via a gantry, and the unit tower body is transferred into the guide tower and lifted up by the lift-up mechanism of the unit tower body in the guide tower sequentially. Repeatedly, a tower lift-up method characterized in that the tower is constructed from the upper part to the lower part above the bottom tower.   In the lift-up method of the steel tower according to claim 1, the steel tower foundation is configured by inserting the lower part of the lowermost tower body into a cylindrical member placed in the ground and filling with concrete. This is a steel tower lift-up method. In the lift-up method of the steel tower in any one of Claim 1 or Claim 2, a steel tower is a single pillar steel tower installed under the existing steel tower electric wire, and was provided with a brace on the upper part. Attach the brace to the tower so that it is parallel to the existing overhead line, and after completing the lift of the tower, turn the upper tower 90 degrees horizontally from the bottom tower to make the brace orthogonal to the existing overhead line, A tower lift-up method characterized by completing the construction of the tower.

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