JP2010048060A - Construction method of structure - Google Patents

Abstract

The present invention provides a method for constructing a structure capable of improving workability when constructing a structure inclined with respect to the ground surface.
SOLUTION: After a work table 40 is arranged corresponding to the outer wall surface of the floor to be constructed, and the work floor 40 is constructed using the work table 40, the work table 40 is moved to the next construction object along the outer wall surface. In the method of sequentially building the structure inclined with respect to the ground surface to the upper layer by repeating the process of raising to the floor, the work table 40 is moved to the next construction target floor by moving in the inclination direction of the structure. Raise.
[Selection] Figure 3

Description

  The present invention relates to a method for constructing a structure inclined with respect to the ground surface.

  Conventionally, as an example of a method of constructing a structure inclined with respect to the ground surface, a construction method of an oblique column shown in Patent Document 1 is known. In this method, a rail is suspended and supported along the outer wall surface of the oblique column to be constructed, and a work table (scaffold) slidably installed on the rail is used to assemble the rebar, formwork, Work such as placing concrete. And after these construction is completed, a rail is pulled up in the perpendicular direction and a work table is raised to the next construction object floor. The oblique column is constructed by repeating the above steps.

  When the work table is pulled up in the vertical direction with respect to the oblique column, the position of the work table is shifted from the position of the oblique column as the work table is raised. For this reason, after raising the work table, the work table is moved in the horizontal direction so that the work table is aligned with the position of the oblique column. When moving the work table in the horizontal direction, it is necessary to balance the work table.

Japanese Patent Laid-Open No. 10-339033

  In the construction method of Patent Document 1 described above, a mechanism for moving the work table in the horizontal direction with respect to the rail is essential, and the apparatus is complicated accordingly. In addition, every time the work table is pulled up to the installation position on the upper floor, it is necessary to move the work table in the horizontal direction so that the position of the work table matches the position of the oblique column. Furthermore, when the work table is moved in the horizontal direction, it is difficult to move the work table so that the work table is always balanced.

  An object of this invention is to provide the method of improving the construction property at the time of constructing | assembling the structure inclined with respect to the ground surface in view of said point.

  In the construction method of the structure of the present invention, a work table is arranged corresponding to the outer wall surface of the floor to be constructed, and after the work floor is constructed using the work table, the work table is placed on the outer wall surface. In the method of sequentially constructing the structure inclined with respect to the ground surface up to the upper layer part by repeating the process of raising up to the next floor to be constructed, moving the work table in the inclination direction of the structure Is raised to the next construction target floor.

  According to a second aspect of the present invention, there is provided a structure construction method according to the first aspect, wherein a jack support member is attached to the outer wall surface, and the work table is attached to the structure by a jack supported by the jack support member. By pushing up in the inclination direction, the work table is raised to the next construction target floor.

  According to a third aspect of the present invention, there is provided a method for constructing a structure according to the first or second aspect, wherein a scaffold is provided on the work table and a suspension scaffold is provided at a lower portion of the work table.

  According to the construction method of the structure of the present invention, when the work table is raised to the installation position on the upper floor, the work table is moved in the inclination direction of the inclined structure. On the other hand, since the position of the work table is not shifted with respect to the structure every time the work table is lifted to the installation position on the upper floor as in the conventional method of lifting the work table in the vertical direction, the workability is excellent.

  Hereinafter, preferred embodiments of a method for constructing a structure according to the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the main tower of a cable-stayed bridge is applied as a structure will be described.

  1 is a side view of the cable-stayed bridge, and FIG. 2 is a front view of the main tower of the cable-stayed bridge shown in FIG. A cable-stayed bridge 1 illustrated in FIG. 1 is a general cable-stayed bridge having a structure in which a bridge girder 4 is supported by a cable 3 that is slanted from main towers 2 and 2 provided at two intermediate positions of the bridge. .

  As shown in FIG. 2, the main tower 2 is a reinforced concrete structure including a pair of oblique columns 5 and 5 and a top portion 6. The pair of slanted columns 5 and 5 have shapes that are inclined with respect to the ground surface in such a manner that the both ends of the pier 7 are the base ends and the distance between them is narrowed upward.

  In the present embodiment, as will be described below, a workbench unit 10 movable in the inclination direction of the oblique column 5 is installed on the construction target floor of the oblique column 5, and a scaffold is installed on the workbench unit 10. Using the scaffolding, rebar assembly work, formwork assembly work, concrete placement work in the formwork, hardened concrete finishing work, etc., and after completion of the work, the workbench unit 10 is inclined to the inclined column 5 The oblique column 5 is constructed by repeating the step of raising in the direction. In the present embodiment, the workbench unit 10 is raised by the first floor (about 4 m). The work table units 10 installed on the pair of oblique columns 5 and 5 are the same.

  FIG. 3 is a front view showing a state in which the oblique column 5 is constructed using the work table unit 10, and FIG. 4 is a work table unit 10 installed on the oblique column 5 located on the right side in FIG. It is the figure which expanded and showed. In FIG. 3, the suspension scaffold 52 in the right workbench unit 10 is omitted. In FIG. 4, the scaffold 51 installed on the workbench unit 10 and the suspended scaffold 52 suspended below are omitted, and a part of the receiving beam 30 is shown broken away.

  3 and 4 includes a climbing device 20 installed on the front wall surface and the rear wall surface of the oblique column 5, and a pair of receiving beams 30 and 30 supported by the climbing device 20. And a work table 40 installed on the pair of receiving beams 30, 30.

  The climbing device 20 has a function of supporting the work table 40 and a function of raising the work table 40 in the direction of inclination of the oblique column 5, and includes a steel plate 21, a reaction force column 22, a jack support member 23, and a jack 24. And the support member 25.

  The steel plate 21 is for fixing a reaction force column 22 to be described later, and is an outer wall surface of the oblique column 5, that is, a hardened concrete wall surface in which the concrete is cured for a predetermined period after being placed and sufficiently strengthened. 8 is fixed by an anchor bolt 26.

  The reaction force column 22 is made of a steel material having a long shape such as H-shaped steel, and is arranged in parallel to the inclined direction of the oblique column 5 as shown in FIG. To the steel plate 21. The reaction force column 22 has a function as a reaction force receiver when the work table 40 is pushed up by the jack 24 and also has a function as a guide rail for raising the support member 25 and the jack 24.

  The jack support member 23 is a steel material fastened to the lower end portion of the jack 24 and attached to the reaction force column 22 so as to be movable along the reaction force column 22. When an operator works on the work table 40 and when the work table 40 is pushed up by extending the jack 24, the jack support member 23 is attached to the reaction force column 22 by a fastening means (not shown) such as a bolt. Fixed against. On the other hand, after the jack 24 is extended and the work table 40 is pushed up to the upper floor, when the climbing apparatus 20 is replaced with the upper floor, the bolt fastening between the jack support member 23 and the reaction force column 22 is released. The jack support member 23 can be raised along the reaction force column 22.

  The lower end of the jack 24 is fastened to the jack support member 23, while the upper end is fastened to the support member 25, and the jack 24 extends to push the support member 25 and the jack support member 23. The receiving beam 30 and the work table 40 are pushed up. As shown in FIG. 4, the jack 24 is arranged so as to be parallel to the reaction force column 22, that is, to be parallel to the inclination direction of the oblique column 5. As the jack 24, a general one such as a hydraulic jack can be applied.

  As illustrated in FIG. 4, the support member 25 is a steel material that supports the receiving beam 30. The support member 25 is fastened to the upper end portion of the jack 24 and is attached to the reaction force column 22 so as to be movable along the reaction force column 22. When the operator performs work on the work table 40 and when the climbing apparatus 20 is replaced with the upper layer portion, the support member 25 is attached to the reaction force column 22 by fastening means (not shown) such as a bolt. Fix it. On the other hand, when the jack 24 is extended to push up the work table 40, the support member 25 can be raised along the reaction force column 22 by releasing the fastening between the support member 25 and the reaction force column 22. It is like that.

  A total of four climbing apparatuses 20 configured as described above are arranged on the wall surface of the front surface 5a and the wall surface of the back surface (not shown) of the oblique column 5 in pairs.

  The receiving beam 30 is supported by the climbing device 20 described above, and has a length dimension larger than the width dimension of the oblique column 5. In this embodiment, a truss beam as illustrated in FIGS. 3 and 4 is applied as the receiving beam 30. One receiving beam 30 is arranged on each of the front 5a side and the back side (not shown) of the oblique column 5.

  The work table 40 is a rectangular table constructed between the two receiving beams 30 and 30 described above. Although not clearly shown in the figure, an opening is formed in the central portion of the work table 40 so as to surround the oblique column 5. As shown in FIG. 4, a roller device 41 is interposed between the work table 40 and the receiving beam 30, so that the work table 40 can slide with respect to the receiving beam 30.

  As shown in FIG. 3, the work table 40 is provided with a scaffold 51 and a suspended scaffold 52 around the oblique column 5. The scaffold 51 is a frame scaffold provided by connecting a required number of building frames 53 in the vertical direction and the horizontal direction on the work table 40. The suspension scaffold 52 is a scaffold provided by suspending a plurality of suspension frames 54 from the work table 40. In the present embodiment, the scaffolds 51 are installed for two levels, and the suspended scaffolds 52 are installed for one level.

  The building frame used for the scaffold installed on the work table 40 is made of a compressed material, and is heavier than the suspension frame used for the suspension scaffold. For this reason, when the two-layer scaffold 51 is provided on the work table 40 and the one-layer suspension scaffold 52 is suspended below the work table 40 as in the present embodiment, the three-layer scaffold 51 is provided on the work table 40. Compared with the case where a scaffold is provided, the overall weight of the workbench unit 10 can be reduced.

  The fulcrum of the work table 40 is near the middle of the support member 25 in the pair of climbing apparatuses 20. In a state where the scaffold 51 and the suspended scaffold 52 are not installed, the work table 40 is balanced around the fulcrum. As shown in FIG. 5, the portion of the oblique column 5 above the work table 40 is on the left side with respect to the fulcrum. For this reason, when the scaffold 51 is provided around the oblique column 5 on the work table 40, the center of gravity of the scaffold 51 is to the left of the fulcrum, and the work table 40 cannot be balanced. Therefore, in order to balance the work table 40, an operation chamber 55 for operating the work table unit 10 is provided on the right side of the work table 40 as shown in FIG. In FIG. 5, the oblique column 5 located on the right side in FIG. 3 is illustrated, but in the case of the oblique column 5 located on the left side in FIG. 3, the operation chamber 55 is installed on the left side of the work table 40. Needless to say.

  In the workbench unit 10 configured as described above, the rebar 9 is assembled and arranged on the second floor of the scaffold 51, and the mold 11 is assembled and formed on the first floor of the scaffold 52, as shown in FIG. 5. The concrete is placed inside. Moreover, in the suspended scaffold 52, the finishing operation | work of the wall surface 8 of the hardened concrete in the state which was made to age for a predetermined period and expressed sufficient intensity | strength is performed.

  Next, a procedure for constructing the oblique column 5 using the work table unit 10 will be described with reference to FIGS. In the present embodiment, since the work table unit 10 is installed on each of the pair of oblique columns 5 and 5 and construction is performed independently, only the construction of one of the oblique columns 5 will be described below.

  First, when constructing the first floor of the oblique column 5 as shown in FIG. 6A, a scaffold (not shown) is provided on the pier 7 without using the workbench unit 10, and is constructed by normal support work. To do. After the concrete placed on the first floor is cured and hardened, the workbench unit 10 is installed at the position shown in FIG. 6-2 as follows. The reaction force column 22 is fixed to the hardened concrete wall surface 8 on the first floor of the oblique column 5 via a steel plate 21 (see FIG. 4), and the climbing device 20 is installed. At this time, both the jack support member 23 and the support member 25 of the climbing device 20 are fixed to the reaction force column 22. Next, after the work table 40 is supported by the climbing device 20 via the receiving beam, a two-level scaffold 51 is provided on the work table 40 and a one-level suspended scaffold 52 is provided below the work table 40. As described above, the installation of the workbench unit 10 is completed.

  The second and subsequent floors of the oblique column are constructed using the work table unit 10. As shown in FIG. 6B, on the first floor of the scaffold 51, rebar assembly of the second floor portion of the oblique column 5, installation of the mold 11, and concrete placement into the mold 11 are performed. On the second floor of the scaffold 51, rebar assembly of the third floor portion of the oblique column 5 is performed. Moreover, in the suspended scaffolding 52, the finishing work of the hardened concrete on the first floor of the oblique column 5 is performed. The above construction is performed simultaneously.

  After the construction from the first floor to the third floor of the oblique column 5 is completed and the concrete placed on the second floor is hardened, the hardened concrete wall surface 8 on the second floor of the oblique column 5 is passed through the steel plate 21 (see FIG. 4). Then, the reaction force column 22 is fixed and the climbing device 20 is installed. At this time, the reaction column 22 on the second floor is installed so as to be continuous with the reaction column 22 installed on the first floor.

  Next, the workbench unit 10 is raised to the upper floor installation position (position indicated by the broken line in FIG. 6-2) as follows. First, the fastening between the support member 25 and the reaction force column 22 of the climbing apparatus 20 is released, and the support member 25 is moved along the reaction force column 22. Next, the work table 40 is pushed up by extending the jack 24 and raising the support member 25 along the reaction force column 22. As a result, the work table 40 rises in the inclination direction of the oblique column 5 and reaches the installation position on the upper floor.

  After raising the work table 40 to the installation position on the upper floor, the support member 25 of the climbing device 20 is fixed to the reaction force column 22. On the other hand, the fastening of the jack support member 23 and the reaction force column 22 is released, so that the jack support member 23 is movable along the reaction force column 22. Then, after the jack 24 is retracted and the jack support member 23 is raised along the reaction force column 22, the jack support member 23 is fixed to the reaction force column 22. By the above procedure, the movement of the workbench unit 10 is completed as shown in FIG. 6-3.

  As shown in FIGS. 6-2 and 6-3, the position of the work table 40 with respect to the oblique column 5 after moving to the installation position on the upper floor is different from the position of the work table 40 with respect to the oblique column 5 before moving. Absent. That is, the position of the work table 40 does not shift with respect to the oblique column 5. Therefore, it is not necessary to move the work table 40 in the horizontal direction or move the scaffold 51 and the suspended scaffold 52 after moving the work table 40 to the installation position on the upper floor, and can immediately start each work. .

  When the workbench unit 10 is in the position shown in FIG. 6-3, on the first floor of the scaffold 51, the formwork 11 on the third floor portion of the oblique column 5 is installed and the concrete is placed in the formwork 11, and the scaffold is placed. On the second floor of 51, the reinforcing bars 9 on the fourth floor of the oblique pillar are assembled, and on the suspension scaffold 52, the hardened concrete on the second floor of the oblique pillar 5 is finished.

  By repeating the above-described steps, the oblique column 5 is constructed in an obliquely upward direction. The same process is repeated for the other oblique column 5 to build.

  Note that the distance between the pair of oblique columns 5 and 5 decreases as the construction of the pair of oblique columns 5 and 5 progresses. For this reason, when constructing the upper layer portion, in order to prevent the two work tables 40, 40 from colliding with each other, as shown in FIG. Slide against beam 30.

  As described above, according to the structure construction method in the present embodiment, when the work table 40 is raised to the installation position on the upper floor, the work table 40 is moved in the inclination direction of the oblique column 5. Thus, the position of the work table 40 with respect to the oblique column 5 is changed every time the work table 40 is pulled up to the installation position on the upper floor as in the conventional method of lifting the work table 40 in the vertical direction with respect to the oblique column 5. Since there is no slippage, it is excellent in workability.

  Moreover, according to the construction method of the structure in the present embodiment, the work table 40 is attached to the outer wall surface via the reaction force column 22 and the jack 24 supported by the jack support member 23 is used. By pushing up in the inclination direction of the oblique column 5, the work table 40 can be reliably moved in the inclination direction of the oblique column 5 with a simple configuration.

  Further, according to the construction method of the structure in the present embodiment, the scaffold 51 is provided on the work table 40 and the scaffold 52 is suspended below the work table 40, so that the scaffold is provided only on the work table 40. It is possible to reduce the overall weight of the workbench unit 10 as compared to the case of providing the work table. That is, since the building frame used for the scaffold 51 installed on the work table 40 is composed of a compressed material, it is heavier than the suspension frame used for the suspension scaffold. Therefore, when the two-layer scaffold 51 is provided on the work table 40 and the one-layer suspension scaffold 52 is suspended below the work table 40 as in the above embodiment, the three-layer scaffold 51 is provided on the work table 40. Compared with the case where the scaffold 51 is provided, the overall weight of the workbench unit 10 can be reduced.

  In the above embodiment, the case where the main tower of the cable-stayed bridge is constructed has been described. However, the application target is not limited to this, and the present invention is also applied to the case where other columnar structures are constructed obliquely. can do. Moreover, although the said embodiment demonstrated the case where a reinforced concrete structure was constructed | assembled, it is applicable also to structures other than reinforced concrete structures, such as a steel tower.

  Moreover, although the case where two structures were constructed | assembled was demonstrated in the said embodiment, of course, you may apply to one structure.

  Furthermore, in the above embodiment, the work table 40 can be slid with respect to the receiving beam 30 in order to prevent the work tables 40 of the work table units 10 installed on the pair of oblique columns 5 and 5 from colliding with each other. Although constructed, when a single structure is constructed, it is not always necessary to provide a slide mechanism.

It is a side view of a cable-stayed bridge. It is a front view of the main tower in a cable-stayed bridge shown in FIG. It is a front view which shows the state which has constructed the main tower (slanted column) shown in FIG. 2 by applying the construction method of the present invention. In FIG. 3, it is the figure which expanded and showed the workbench unit. It is a figure for demonstrating the construction content performed on each floor of the scaffold of a work bench unit. It is a figure explaining the procedure which constructs an oblique pillar using a workbench unit. It is a figure explaining the procedure which constructs an oblique pillar using a workbench unit. It is a figure explaining the procedure which constructs an oblique pillar using a workbench unit. It is a figure explaining the procedure which constructs an oblique pillar using a workbench unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cable-stayed bridge 2 Main tower 3 Cable 4 Bridge girder 5 Oblique pillar 6 Top part 7 Pier pier 8 Hardened concrete wall 9 Reinforcement 10 Worktable unit 11 Formwork 20 Climbing device 21 Steel plate 22 Reaction force pillar 23 Jack support member 24 Jack 25 Support member 26 Anchor bolt 30 Receiving beam 40 Work table 41 Roller device 51 Scaffolding 52 Suspended scaffolding 53 Building frame 54 Hanging frame 55 Operation room

Claims (3)

A work table is arranged corresponding to the outer wall surface of the floor to be constructed, and after the work floor is constructed using the work table, the work table is raised along the outer wall surface to the next floor to be constructed. In the method of sequentially building the structure inclined to the ground surface up to the upper layer by repeating the process,
A construction method for a structure, wherein the work table is moved up to the next floor to be constructed by moving the work table in an inclination direction of the structure.   A jack support member is attached to the outer wall surface, and the work table is raised to the next floor to be constructed by pushing up the work table in a tilt direction of the structure with a jack supported by the jack support member. The method for constructing a structure according to claim 1.   The structure construction method according to claim 1 or 2, wherein a scaffold is provided on the work table, and a suspended scaffold is provided at a lower part of the work table.

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