JP3814265B2 - How to build tower buildings - Google Patents

Description

  The present invention relates to a tower building used for communication equipment and the like and a construction method thereof.

JP 2002-70362 A Japanese Patent No. 297798 Japanese Examined Patent Publication No. 61-34549

  When building a tower building for communication equipment (for example, a radio tower equipped with wireless transceivers) on the rooftop of a building, a steel truss structure has been used as the tower building structure. Adopted.

  For this reason, it has low rigidity and is not only easily shaken in strong winds, but also has a problem of having a sense of unity with the building and adversely affecting the appearance of the building because the steel members are exposed. It was.

  As rust prevention measures for steel members, there are cases of galvanizing and paint coating, but in the former case, welding cannot be adopted for joining steel members, and flange joining with bolts and nuts Therefore, there is a problem that the joint becomes large, and according to the latter, there is a problem that regular maintenance (painting) and a large temporary scaffold for that purpose and a curing sheet to prevent the paint from scattering are necessary. there were.

  In addition, each of the construction surfaces in the X and Y directions perpendicular to each other has a steel truss structure, so that the joining portion of the truss has a complicated shape, and the work such as joining work and paint painting is complicated. There is also.

  In the above-mentioned Patent Document 1, a steel tower having a truss structure composed of a column steel frame, a beam steel frame, a brace, etc. is erected so as to surround the outer peripheral surface of the chimney cylinder body, and the chimney cylinder body is supported by the steel tower. A tower-like building whose outer peripheral surface is covered with a precast concrete plate is described.

  However, in this tower building, the precast concrete slab is a curtain wall attached to the steel tower in a state allowing the interlayer displacement. Therefore, it looks like a concrete wall in appearance, but it has many of the above-mentioned problems as it is because it is a steel truss structure.

  In addition, Patent Document 2 describes a steel-frame / RC composite building in which the beam direction is a steel framed ramen structure and the beam-to-beam direction is a reinforced concrete multistory earthquake-resistant wall by concrete casting in-situ. Patent Document 3 describes a building in which two precast concrete plates with built-in steel braces are arranged in a plane between steel columns and arranged in a plane, so that the inter-beam direction is a multi-layer earthquake resistant wall. However, these are all multi-story residential buildings with multi-layer seismic walls and are not tower buildings.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is that the steel member is not exposed as compared with a conventional tower-shaped building having a steel structure truss structure. The object is to provide a tower structure with a new structure that provides a sense of unity with the building in terms of design, has high rigidity, and requires less shaking during strong winds and earthquakes.

In order to achieve the above object, the technical measures taken by the present invention are as follows. That is, the method for constructing a tower building according to the invention of claim 1 includes two precast concrete plates arranged opposite to each other and a pair of steel truss units connected between both side portions of the precast concrete plate. And a floor unit laid between the horizontal members of the steel truss unit. A tower unit is pre-assembled at a low position, and the tower unit is stacked using a lifting machine. The steel truss units are connected to each other, and among the perpendicular construction surfaces in the X and Y directions, the construction surface in the X direction is a reinforced concrete seismic wall, and the construction surface in the Y direction uses the seismic wall of the truss. It is characterized by constructing a tower-like building with a square cross section, which is a steel truss structure used as a vertical member.

The earthquake-resistant wall may be constructed by in-situ concrete casting, but the earthquake-resistant wall is configured by adding a plurality of precast concrete plates in the vertical direction as in the invention described in claim 1 . This is desirable for shortening the construction period and improving quality.

  In the above tower building, among the X and Y direction planes perpendicular to each other, the X direction plane is a reinforced concrete seismic wall, and the Y direction plane uses the seismic wall as a vertical member of the truss. The steel truss structure is a structural form that has a unique appearance in which the steel truss structure can be seen between two opposing concrete seismic walls, and that the two concrete seismic walls are vertical members of the steel truss structure. Therefore, the number of steel members constituting the truss is reduced, so that the exposed steel members are remarkably reduced as compared with the conventional tower-shaped building which is a steel structure truss structure. Therefore, the appearance of the tower-like building is good, and a sense of unity with the building can be obtained in terms of design.

  Moreover, the X-direction construction surface is a highly rigid concrete shear wall, and the Y-direction construction surface is a steel truss structure using a rigid concrete earthquake-resistant wall as a truss vertical member. The vibration is reduced and strong against torsional deformation, yet it is combined with a concrete shear wall and a steel truss structure, so it is much lighter than a concrete shear wall and acts on the lower building. The load can be small, which is advantageous for building design.

In particular, according to the present invention, in constructing the tower building described above , a pair of precast concrete plates arranged in advance opposite each other and a pair of the two connected to both sides of the precast concrete plate are connected. A tower unit comprising a steel truss unit and a floor material laid between the horizontal members of the steel truss unit is pre-assembled at a low position, and this is piled up by a lifting machine, and the precast concrete plates of the upper and lower tower units are And the steel truss units are connected to each other, so that the work at high places is reduced, and the precast concrete plates and steel truss units can be connected to each other using the flooring as a work scaffold. The unit can be used in place of a safety fence for preventing falls during connection work. Therefore, safe and efficient high-precision construction is possible, and the construction period can be shortened and the quality can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereby.

  In FIG. 1, A indicates a tower building for communication equipment standing on the roof of building B (specifically, a radio tower provided with wireless transceivers 1). As shown in FIGS. 2 to 4, the tower-like building A has a quadrangular cross-section and has two opposite surfaces, that is, the X- and Y-direction surfaces are perpendicular to each other. It is a reinforced concrete seismic wall 2 and the construction surface in the Y direction is a steel truss structure 3 using the seismic wall 2 as a vertical member of the truss. The seismic wall 2 includes a plurality of precast concrete plates 4. It is constructed by adding vertically.

  The tower building A includes two precast concrete plates 4 arranged opposite to each other, a pair of steel truss units 5 connected between upper end portions on both sides of the precast concrete plate 4, and the steel truss units. A tower unit a comprising a floor member 7 laid between 5 horizontal members (beam steel frames) 6 is pre-assembled at a low position (on the ground or on the roof), and the tower is used by using a lifting machine (not shown). It is constructed by stacking the units a and connecting the precast concrete plates 4 and the steel truss units 5 of the upper and lower tower units a. 2 in FIG. 2 is a hanging wire by a lifting machine.

  Each precast concrete plate 4 is formed in a square shape, and columnar portions 4b are provided on both sides in the width direction of a plate-like portion 4a having a certain thickness. The dimensions of the precast concrete plate 4 are matters that should be set arbitrarily. In the example shown in the figure, the length is set to 3300 mm in length and 2700 mm in width, the thickness of the plate-like portion 4 a is set to 180 mm, and the column shape The portion 4b has a thickness of 300 mm and a width of 550 mm.

  In the plate-like portion 4a, wall bars 9 are embedded in the form of vertical and horizontal lattices, in the columnar part 4b, column main bars 10 and hoop bars 11 are embedded, and in the vicinity of the upper end of the columnar part 4b. A gusset plate 12 for connecting the ends of the horizontal members 6 of the steel truss unit 5 is embedded. Reference numeral 13 denotes a stud connector fixed to the gusset plate 12.

  The upper end side of the vertical wall reinforcement 9 and the upper end side of the columnar reinforcement 10 are appropriate lengths from the top end of the precast concrete plate 4 (this is ½ of the axial length of the joint sleeve 14 described later. For example, And a joint sleeve 14 is fitted on the lower end side of the wall reinforcement 9 and the lower end side of the column main reinforcement 10, and each sleeve 14 is attached to the precast concrete plate 4. It is embedded in the state opened to the lower end surface.

  The sleeve 14 is known, and as shown in FIGS. 7 and 8, by deforming the tower unit a of the next stage on the tower unit a previously constructed, The deformed reinforcing bars (wall bars 9 and column main bars 10 of the upper tower unit a) inserted into the sleeve 14 in advance are inserted into the sleeve 14 and the wall bars 9 and column main bars 10) of the lower tower unit a are inserted into the sleeve 14. In this state, cement-based non-shrinkable high-strength grout material 16 is injected into the sleeve 14 from the inlet 15a communicating with the sleeve 14, and deformed reinforcing bars (upper and lower wall bars 9 and column main bars 10). Are configured to be integrated.

  An inlet 15a and a filling confirmation exhaust port 15b are opened on the inner surface of the precast concrete plate 4 so that the grouting operation for the sleeve 14 can be performed from above the flooring 7.

  The steel truss unit 5 is composed of a horizontal member (beam steel frame) 6 and an oblique member (brace steel frame) 17 which intersects and integrates with each other in an X shape, and the lower end side of the oblique member 17 has an appropriate length ( For example, a diagonal portion of 500 mm) is cut out, and a diagonal portion 17 a having a length corresponding to the cut diagonal portion is fixed to the upper portion of the horizontal member (beam steel frame) 6. ing. Then, as shown in FIG. 7 and FIG. 8, the diagonal section 17 a of the lower tower unit a and the upper tower are stacked by stacking the next tower unit a on the tower unit a previously constructed. The diagonal member 17 of the unit a is abutted, the joint plate 18 is applied, and the bolts and nuts 19 are connected.

  As the flooring 7, expanded metal or grating is used, and is laid on a small beam steel frame 20 laid between the horizontal members 6. 21 is a brace with a horizontal turnbuckle arranged along the lower surface of the flooring 7. Reference numeral 22 denotes an opening for raising and lowering formed in a part of the flooring 7, and a vertical trapping 23 is inserted into an inner side surface of the precast concrete plate 4 through an insert fitting (not shown) at a position corresponding to the opening 22. Connected to each other. In order to prevent a crash, the openings 22 and the traps 23 are provided by alternately shifting the positions in the horizontal direction for each tower unit a.

24 is a handrail for main installation provided along the inner side of the steel truss unit 5, and is connected to the precast concrete plates 4 on both sides via insert metal fittings (not shown). It is desirable that the handrail 24 is fixed to the diagonal member 17 of the steel truss unit 5 by means such as binding to prevent deformation of the tower unit a during the lifting operation.

  The above-mentioned tower building A has X- and Y-direction planes perpendicular to each other, the X-direction plane is the reinforced concrete seismic wall 2, and the Y-direction plane is the vertical wall of the truss. The steel truss structure 3 is used as a member. The steel truss structure 3 has a peculiar appearance in which the steel truss structure 3 can be seen between the two opposing concrete seismic walls 2 and the two concrete seismic walls 2. Is used as a vertical member of the steel truss structure 3, and the number of steel members constituting the truss is reduced, so that the steel member is exposed as compared with the conventional tower-shaped building which is a steel truss structure. It will decrease significantly. Therefore, the appearance of the tower-like building A is good, and a sense of unity with the building B can be obtained in design.

  Moreover, the X-direction construction surface is a highly rigid concrete shear wall 2 and the Y-direction construction surface is a steel truss structure 3 that uses the rigid concrete earthquake resistance wall 2 as a vertical member of the truss. The vibration at the time of the earthquake is reduced and it is strong against torsional deformation. However, since the concrete shear wall 2 and the steel truss structure 3 are combined, it is much lighter than the case where the whole is a concrete shear wall. The load acting on the building B can be small, which is advantageous in designing the building B.

  In particular, according to the construction method described above, two precast concrete slabs 4 arranged in advance opposite to each other, and a pair of steel truss units 5 connected between both sides of the precast concrete slab 4; A tower unit a comprising a floor member 7 laid between the horizontal members 6 of the steel truss unit 5 is pre-assembled at a low position, and this is stacked with a lifting machine to precast concrete plates 4 of the upper and lower tower units a. Since the two and the steel truss units 5 are connected to each other, the work at high places is reduced, and the precast concrete plates 4 and the steel truss units 5 can be connected to each other by using the flooring 7 as a work scaffold. The concrete plate 4 and the steel truss unit 5 can be used in place of a safety fence for preventing falling during the connection work.

  Therefore, safe and efficient high-precision construction is possible, and the construction period can be shortened and the quality can be improved.

It is the whole schematic perspective view which shows an example of the tower-shaped building which concerns on this invention. It is a perspective view which shows the state in the middle of construction of a tower-like building. It is a vertical front view which shows the state in the middle of construction of a tower building. It is a vertical side view which shows the state in the middle of construction of a tower building. It is a bottom view of a tower unit. It is a cross-sectional top view of the principal part. It is a vertical front view of the principal part explaining the connection method of an upper and lower tower unit. It is a vertical front view of the principal part explaining the connection method of an upper and lower tower unit.

Explanation of symbols

A ... Tower building
a ... Tower unit
2 ... Concrete earthquake resistant wall
3 ... Steel truss structure
4 ... Precast concrete plate
5 ... Steel truss unit
6 ... Horizontal member
7 ... flooring

Claims (1)

Two precast concrete plates arranged opposite to each other, a pair of steel truss units connected between both sides of the precast concrete plate, and a flooring laid between horizontal members of the steel truss unit X- and Y-directions that are perpendicular to each other by pre-assembling the tower unit at a low position, stacking the tower units using a lifting machine, and connecting the precast concrete plates of the upper and lower tower units and the steel truss units together Of the construction surfaces, the X-direction construction surface is a reinforced concrete seismic wall, and the Y-direction construction surface is a steel truss structure using the seismic wall as a vertical member of the truss. A method for constructing a tower building characterized by constructing a building.

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