JP2018178658A - Method for constructing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a construction period of a structure.SOLUTION: A method for constructing a structure includes: a frame construction step of constructing a frame 50 having a pair of preceding columns 52 and a beam 58 supported by the pair of preceding columns 52; and a post-construction column construction step of constructing a post-construction column 54 supporting the beam 58 adjacent to the preceding column 52.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a construction method of a structure.

  There is known a construction method of a structure in which a pillar supporting an upper structure is placed on a half precast footing (see, for example, Patent Document 1).

  Moreover, the construction method of the artificial ground which excavates a pile hole in the ground is known from the working hole of the artificial ground reinforced with the truss (for example, refer patent document 2).

JP 2001-355246 A Japanese Patent Application Publication No. 2006-083673

  According to the construction method disclosed in Patent Document 1, simultaneous construction of cast-in-place concrete to be placed on a half precast footing and an upper structure supported by a column becomes possible, thereby shortening the construction period of the structure. Can.

  However, there is room for further improvement to shorten the construction period of the structure.

  The present invention aims to shorten the construction period of a structure in consideration of the above facts.

  In the construction method of a structure according to claim 1, a frame construction step of constructing a frame having a pair of leading columns and a horizontal member supported by the pair of leading columns, and next to the leading columns, The post-construction pillar construction process of constructing a post-construction pillar supporting the horizontal member.

  According to the construction method of a structure in accordance with the first aspect, in the construction processing step, a construction having a pair of leading columns and a horizontal member supported by the pair of leading columns is constructed. Next, in the post-construction pillar construction process, a post-construction pillar supporting the horizontal member is constructed next to the leading pillar.

  As described above, in the present invention, for example, the upper structure to be constructed on the frame and the post-construction column can be constructed in parallel by constructing the frame in which the post-construction column is thinned in advance. . Therefore, the construction period of the structure can be shortened.

  The construction method for a structure according to claim 2 is the construction method for a structure according to claim 1, wherein a post-construction pile is carried out to construct a post-construction pile for supporting the post-construction column after the frame construction process. It has a process.

  According to the construction method of a structure according to claim 2, in the post-construction pile construction step after the frame construction step, the post-construction pile supporting the post-construction column is constructed. Thereby, the upper structure to be constructed on the frame, and the post-construction pile and the post-construction column can be constructed in parallel. Therefore, the construction period of the structure can be further shortened.

  In the construction method of a structure according to claim 3, in the construction method of a structure according to claim 2, in the post-construction pile construction step, at least a part of the post-construction pile is constructed from above the horizontal member Do.

  According to the construction method of a structure according to claim 3, in the post-construction pile construction step, at least a part of the post-construction pile is constructed from above the horizontal member.

  Here, for example, when the post-construction pile is a cast-in-place pile, from above the horizontal member, it is possible to insert a reinforcing bar unit whose total length is longer than the floor height of the frame into the ground hole. Therefore, the number of divisions of the reinforcing bar unit can be reduced. Therefore, since the connection location of a reinforcement unit decreases, the construction property of a post-construction pile improves.

  As explained above, according to the construction method of a structure according to the present invention, the construction period of the structure can be shortened.

It is an elevation view which shows the structure constructed by the construction method of the structure concerning this embodiment. (A) and (B) are elevations explaining a prior pile construction process. (A) is an elevation view explaining a frame construction process, (B) is an elevation view explaining an upper structure construction process. It is an elevation view explaining an upper structure construction process, a post-construction pile construction process, and a post-construction pillar construction process. It is an elevation view explaining a post-construction pile construction process. It is an elevation view explaining a post-construction pillar construction process. (A)-(C) are top views which show the work opening of a slab. It is an elevation view explaining the modification of a post-construction pile construction process. It is an elevation view explaining the modification of a post-construction pillar construction process. It is an elevation view which shows the modification of arrangement | positioning of a post-construction pile and a post-construction pillar. It is a top view which shows the modification of the work opening of a slab. It is a top view which shows the modification of arrangement | positioning of a post-construction pile and a post-construction pillar.

  Hereinafter, the construction method of a structure according to an embodiment will be described with reference to the drawings.

(Structure configuration)
First, the structure of the structure constructed by the construction method of the structure according to the present embodiment (hereinafter simply referred to as "construction method") will be described.

  The structure 10 constructed by the construction method which concerns on this embodiment is shown by FIG. The structure 10 includes a base 40 provided under or around the existing facility 20, a frame 50 supported by the base 40, and an upper structure 60 installed on the frame 50.

(Existing facility)
The existing facility 20 includes a railway station 22 as an example. The station 22 has a plurality of tracks 26 on which the railcars 24 travel and a plurality of platforms 28 on which the railcars 24 stop. The plurality of tracks 26 are laid on the ground G. Further, the plurality of lines 26 run in parallel, and cross the structure 10 in plan view. Furthermore, a platform 28 is disposed beside each track 26.

  A plurality of platforms 28 are disposed along the track 26. An upper structure 60 described later is disposed on the line 26 and the platform 28. The line 26 may be one, and the platform 28 may be one.

(Basic)
The foundation 40 is a pile foundation and has a plurality of preceding piles 42 and post-construction piles 44. The leading pile 42 and the post-construction pile 44 are provided on the ground G below the platform 28 at the side of the track 26. The preceding pile 42 and the post-construction pile 44 are, for example, cast-in-place piles.

  In addition, the structure and arrangement of the leading pile 42 and the post-construction pile 44, and the number thereof can be changed as appropriate. Thus, the leading piles 42 and the post-construction piles 44 may, for example, be disposed beside the platform 28 rather than below the platform 28.

(Structure)
The frame 50 has a plurality of leading columns 52 and post-construction columns 54, and a plurality of beams 56, 58A, 58B, and is arranged to straddle at least a part of the existing facility 20. The leading post 52 is erected on the leading pile 42. Also, the post-construction pillar 54 is erected on the post-construction pile 44. That is, in the structure 10, the one pillar one pile structure is adopted. The leading pillars 52 and the post-construction pillars 54 support the upper structural body 60 disposed above (above) the track 26, and a traveling space in which the railway vehicle 24 can travel under the upper structural body 60 ( Space for existing facilities) 30 is formed.

  The beam 56 is bridged by a pair of adjacent leading columns 52, and the beams 58A and 58B are bridged respectively by adjacent leading columns 52 and post-construction columns 54. A frame 50 is configured by the leading post 52, the post-construction post 54, and the beams 56, 58A, 58B. Further, a slab 62 (see FIG. 5) is provided on the beams 56, 58A, 58B. Furthermore, an upper structure 60 is provided on the frame 50.

(Superstructure)
The upper structure 60 is an over-track structure provided above the track 26 (an over-the-air facility existing structure). The upper structural body 60 includes, for example, a plurality of floors (a plurality of layers), and includes a plurality of columns 64, beams 66 bridged by the adjacent columns 64, and a slab (not shown) supported by the beams 66. There is. In addition, the upper structure 60 has, for example, a movement path between the plurality of platforms 28 and the like.

(Construction method of structure)
Next, the construction method of the structure according to the present embodiment will be described.

(Preceding pile construction process)
First, the preceding pile construction process will be described. The existing facility 20 provided in the ground G is shown by FIG. 2 (A). From this state, as shown in FIG. 2 (B), the leading pile 42 is applied under the platform 28. In the construction of the leading pile 42, for example, a pile hole is excavated in the ground G by an unillustrated excavating machine, and a rebar cage (not illustrated) is inserted into the excavated pile hole, and concrete is cast. Thereby, the leading pile 42 of reinforced concrete is constructed.

  In the present embodiment, for example, as shown in FIG. 2A, the ground G below the track 26 and the platform 28 is a pipe such as a sludge pipe or a concrete supply pipe as a preparation work for the leading pile 42. 32 are laid. The size, shape, arrangement, and number of the pipes 32 can be changed as appropriate.

(Frame construction process)
Next, the frame construction process will be described. In the frame construction process, as shown in FIG. 3A, a frame (preceding frame) 50 in which the post construction column 54 is thinned is constructed on the leading pile 42. Specifically, the leading pillars 52 are respectively erected on the plurality of leading piles 42, and beams 56, 58 as horizontal members are constructed on the adjacent leading pillars 52, respectively.

  The horizontal member is not limited to the beams 56 and 58, and may be a slab or both beams and slabs. In addition, the frame (preceding frame) can be configured by a plurality of leading columns, that is, at least two or more leading columns, and a horizontal member installed on the leading columns.

  Here, as described above, the post-construction pillar 54 does not exist in the frame (preceding frame) 50. Therefore, the support span L of the beam 58 is long until the post-construction pillar 54 is post-construction.

(Superstructure construction process)
Next, the upper structure installation process will be described. In the upper structure installation step, the upper structure 60 is installed on the frame 50, as shown in FIG. 3 (B). Specifically, for example, a reinforced concrete slab 62 (see FIG. 5) is constructed on the beams 56 and 58 of the frame 50. Further, the pillars 64 are respectively erected on the leading pillars 52, and the beams 66 are constructed on the adjacent pillars 64, respectively. Thereby, as shown in FIG. 4, the upper structural body 60 consisting of a plurality of floors is constructed.

  Here, in the structure 50 before the post-construction column 54 is constructed, as described above, the support span L (see FIG. 3A) of the beam 58 is long, and the beam 58 is easily bent. As a countermeasure, in the present embodiment, the beam 58 is reinforced by a reinforcing member. In addition, what is necessary is just to provide a reinforcement member as needed, and can be abbreviate | omitted suitably.

  As a reinforcement member, for example, a suspending material 70 such as a wire for lifting a joint of the beam 58 with the post-construction pillar 54 or a brace may be mentioned. Further, the cross-sectional area of the beam 58 may be increased, or the immediately upper floor of the frame 50 may be a truss structure in which the beams 56 and 58 are lower chord members.

  In addition, the hanging material 70 may be provided with a level adjustment mechanism for adjusting the level of the beam 58, for example. Examples of the level adjustment mechanism include a chain block 72 for tensioning the hanging member 70, and a jack or the like incorporated in the brace to shorten the overall length of the brace.

  In addition, reinforcement members, such as suspension material 70, may be permanent installation, and may be temporary installation. That is, the hanging material 70 may or may not be removed after the post-construction column 54 is installed. Further, the reinforcing member may be provided as necessary, and can be omitted as appropriate.

  Further, as shown in FIG. 5, the slab 62 is provided with a work opening 62A for constructing a post-construction pile 44 and a post-construction column 54 described later. The work opening 62A is disposed above the post-construction pile 44 and the post-construction column 54. In addition, the work opening 62A is disposed above the beam-to-beam connection between the post-construction column 54 and the beam 58. The work opening 62A is, for example, an opening larger than the flat cross section of the post-construction pile 44 and the post-construction column 54.

  As shown in FIG. 7A, the periphery of the work opening 62A is reinforced by a temporary or permanent reinforcement beam 68. Thereby, the strength of the periphery of the work opening 62A is secured. The reinforcing beams 68 may be provided as necessary and can be omitted as appropriate.

(Post-construction pile construction process)
Next, the post-construction pile construction process will be described. As shown in FIG. 4, the post-construction pile construction process is performed in parallel with the above-described upper structure construction process. In the post-construction pile construction process, a post-construction pile 44 is constructed on the ground G from above the slab 62 laid on the beams 56, 58 of the structure 50. That is, in the post-construction pile construction process, the post-construction pile 44 is constructed on the ground G using the slab 62 as a workbench.

  Specifically, first, an excavator (not shown) is installed around the work opening 62A (see FIG. 5) of the slab 62, and the ground G is excavated through the work opening 62A. Thereby, a pile hole 46 for the post-construction pile 44 is formed in the ground G. In addition, in this embodiment, in order to construct the post-construction pile 44 under the platform 28, the through-hole 28A (refer FIG. 5) for constructing the post-construction pile 44 also in the platform 28 is formed.

  Next, as shown in FIG. 5, the rebar cage 48 divided into a plurality of pieces is lifted by a crane or the like (not shown), and the rebar cage 48 is inserted from above the slab 62 into the pile hole 46 through the work opening 62A. At this time, a plurality of reinforcing steel cages 48 are inserted into the pile holes 46 in a joined state. The reinforcing bar cage 48 is an example of a reinforcing bar unit.

  Next, a concrete casting machine (not shown) is installed on the slab 62, and concrete is cast from above the slab 62 into the pile hole 46 through the work opening 62A. Thereby, the post-construction pile 44 is constructed. In addition, the column base part of the post-construction pillar 54 mentioned later is joined to the pile head of the post-construction pile 44. As shown in FIG.

(Post-construction column construction process)
Next, the post-construction column construction process will be described. The post-construction pillar construction process is performed in parallel with the above-described upper structure construction process. In the post-construction pillar construction process, a post-construction pillar 54 supporting the beam 58 is constructed on the post-construction pile 44 from above the slab 62. In other words, the post-construction pillar 54 supporting the beam 58 is constructed between the pair of adjacent leading pillars 52 by using the slab 62 as a workbench.

  Specifically, as shown in FIG. 6, the post-construction pillar 54 is lifted by a crane or the like (not shown), and the post-construction pillar 54 is installed from above the slab 62 through the work opening 62A. Do. At this time, the column base portion of the post-construction pillar 54 is inserted into the pile hole 46 through the through hole 28A of the platform 28. In this state, concrete is placed in the pile holes 46 and the through holes 28 A of the platform 28, and the column base portion of the post-construction pillar 54 is fixed to the column head of the post-construction pile 44.

  Next, the beam 58 is joined to the beam connection of the post-construction pillar 54. Thereby, the frame 50 (see FIG. 1) is constructed by the leading pillar 52, the post construction pillar 54, and the beams 56, 58. Further, since the beams 58 (the beams 58A and 58B) are supported by the post-construction pillar 54, the support span of the beams 58A and 58B is shortened. Thereafter, concrete is cast in the work opening 62A to close the work opening 62A.

(Action and effect)
Next, the operation and effects of the present embodiment will be described.

  As shown in FIG. 1, according to the construction method according to the present embodiment, the upper structural body 60 of the structure 10 is constructed above (over the sky) the existing facility 20. Here, when constructing the upper structural body 60 above the existing facility 20, for example, the foundation 40 (previous pile 42 and post-construction pile 44 of one day depending on the operating time of the existing facility 20, ie, the operating time of the station 22). The construction time (construction time) is limited. Therefore, the construction period of the structure 10 may be prolonged.

  As a countermeasure for this, in the present embodiment, first, in the frame construction process, the frame 50 in which the post-construction pile 44 and the post-construction column 54 are thinned out is constructed. Next, the upper structure construction process and the post-construction pile construction process and the post-construction column construction process are performed in parallel. That is, the upper structural body 60, and the post-construction pile 44 and the post-construction pillar 54 are constructed in parallel. Thereby, after construction of the post-construction pile 44 and the post-construction pillar 54, the construction period of the structure 10 can be shortened as compared with the case of constructing the upper structural body 60.

  Further, the post-construction pile 44 is constructed on the ground G from above the slab 62 laid on the beam 58 of the frame 50. Here, when constructing the post-construction pile 44 from above the platform 62 to the ground G from above the slab 62, for example, an excavator or the like for constructing the post-construction pile 44 after the operation time of the existing facility 20 ends. Since it is necessary to evacuate the excavating machine etc. from above the platform 28 to the site yard etc. according to the operation start time of the existing facility 20 while installing a concrete placing machine etc. on the platform 28, the construction period is extended there's a possibility that.

  On the other hand, in the present embodiment, an excavator or the like is installed on the slab 62, and the post-construction pile 44 is constructed on the ground G from above the slab 62 via the work opening 62A. Therefore, it is not necessary to withdraw the excavator or the like from the top of the slab 62 to the site yard or the like according to the operation start time of the existing facility 20. Therefore, the construction period can be shortened.

  Also, for example, when the reinforcing bar cage 48 is inserted into the pile hole 46 from above the platform 28, the total length of the reinforcing bar cage 48 is shorter than the floor height of the structure 50 so that the reinforcing bar cage 48 does not interfere with the beam 58 or the slab 62. There is a need to.

  On the other hand, in the present embodiment, as shown in FIG. 5, the reinforcing steel cage 48 is inserted into the pile hole 46 from above the slab 62 via the work opening 62A. As a result, since the reinforcing bar cage 48 does not interfere with the beams 58 and the slab 62, the total length of the reinforcing bar cage 48 can be made longer than the floor height of the frame 50. As a result, the number of divisions of the reinforcing bar cage 48 can be reduced. Therefore, since the number of joints and the number of liftings of the reinforcing bar cage 48 are reduced, the workability is improved.

  Similarly to this, in the present embodiment, the post-construction pillar 54 is installed on the post-construction pile 44 from above the slab 62 via the work opening 62A. Thereby, since the post-construction pillar 54 does not interfere with the beam 58 or the slab 62, the post-construction pillar 54 can be installed on the post-construction pile 44 without being divided. Therefore, the workability of the post-construction pillar 54 is improved.

  Furthermore, in the present embodiment, the pile hole 46 for the post-construction pile 44 is excavated in the ground G from above the slab 62 through the work opening 62A, and concrete is cast in the excavated pile hole 46. Therefore, for the construction of the post-construction pile 44, it is not necessary to provide the piping 32 (see FIG. 2A) such as a mud pipe or a concrete supply pipe in the existing facility 20. Therefore, the laying cost of the piping 32 can be reduced.

(Modification)
Next, modifications of the above embodiment will be described.

  The size, shape, and arrangement of the work openings 62A formed in the slab 62 can be appropriately determined. Further, the reinforcing structure of the peripheral portion of the work opening 62A can also be changed as appropriate. For example, in the modification shown in FIG. 7B, the work opening 62A is formed between the pair of substantially parallel beams 58. In the pair of beams 58, reinforcing beams 80 are installed along the peripheral portions on both sides of the work opening 62A, and the peripheral portions of the work opening 62A are reinforced by the reinforcing beams 80.

  Further, in the modification shown in FIG. 7C, the end portions of the beams 58A, 58B supported by the post-construction pillar 54 project into the work opening 62A. On the other hand, a plurality of brackets 82 corresponding to the beams 58A and 58B are provided at the beam-to-beam connection of the post-construction column 54. The ends of the beams 58A and 58B are joined to these brackets 82. Thereby, each beam 58A, 58B can be easily joined to the beam-to-beam connection part of the post-construction pillar 54.

  Next, although the post-construction pile 44 and the post-construction pillar 54 are constructed from the top of the slab 62 laid on the beam 58 of the structure 50 in the above embodiment, the above embodiment is not limited thereto. For example, as shown in FIG. 8, a post-construction pile 44 may be installed on the platform 28. In the example shown in FIG. 8, a concrete casting machine 84 is installed on the platform 28.

  Here, in the modification shown in FIG. 8, since the post-construction pile 44 is not constructed from above the slab 62, the work opening 62A is disposed at a position deviated from above the post-construction pile 44. In the frame construction process, the upper part 54A of the post-construction post 54 is pre-applied to the frame 50.

  In this case, for example, as shown in FIG. 9, the crane unit (not shown) lifts the post unit 54B of the post-construction post 54, and the post unit 54B and the post-construction post 54 via the work opening 62A. And the column base of the column unit 54B is joined to the post-construction pile 44. Further, the gap between the upper portion 54A of the post-construction pillar 54 and the pillar unit 54B is filled with the padding 86, and the upper portion 54A of the post-construction pillar 54 and the pillar unit 54B are joined via the padding 86.

  As described above, it is also possible to construct a part of the post-construction column 54 in the frame construction process, and to construct the remaining part of the post-construction column 54 in the post-construction column construction process.

  Moreover, in the said embodiment, although all the post construction piles 44 were constructed from the top of the slab 62, the said embodiment is not restricted to this. For example, only a part of the post-construction pile 44 may be constructed from above the slab 62, and the other part of the post-construction pile 44 may be constructed from above the platform 28. That is, from above the slab 62, at least a part of the post-construction pile 44 can be constructed.

  Preferably, the reinforcing steel cage 48 of the post-construction post 54 is inserted into the pile hole 46 from above the slab 62 through the work opening 62A. As described above, the total length of the reinforcing bar cage 48 can be made longer than the floor height of the frame 50, and the number of divisions of the reinforcing bar cage 48 can be reduced. Moreover, it is also possible to construct at least one part of the post-construction pile 44 from the platform 28 and the ground G.

  Moreover, in the said embodiment, although all the post-construction pillars 54 were constructed from the top of the slab 62, the said embodiment is not restricted to this. For example, only a part of the post-construction pillar 54 may be constructed from above the slab 62, and the other part of the post-construction pillar 54 may be constructed from above the platform 28. Moreover, it is also possible to construct at least one part of the post-construction pillar 54 from the platform 28 and the ground G.

  Next, although the post-construction pillar 54 was constructed between a pair of leading pillars 52 in the above-mentioned embodiment, the above-mentioned embodiment is not restricted to this. For example, as shown in FIG. 10, the outer periphery pile and the outer periphery pillar of the structure 10 may be used as the post-construction pile 44 and the post-construction pillar 54.

  Specifically, in the frame construction process, the beam 56 is erected on the pair of leading columns 52 to construct the frame 50, and the jump beam 90 splashing from the frame 50 is constructed. In this structure 50, the post construction post 54 supporting the tip end side (free end side) of the jump-out beam 90 is thinned out, and the jump-out beam 90 is supported by the structure 50 in a cantilever state.

  In this case, in the post-construction pile construction step, for example, as shown in FIG. 11, the post-construction pile 44 is constructed from the work opening 62B of the slab 62 constructed on the jump beam 90. The working opening 62B is formed not like a hole but like a notch.

  As shown in FIG. 10, the jump-out beam 90 is appropriately reinforced by the above-described suspension members 70 and the like and a reinforcing member of the brace 92. In addition, as a reinforcement for the jumping beam 90, the cross-sectional area of the jumping beam 90 may be increased. In addition, the jump-out beam 90 is an example of a horizontal member.

  Next, as FIG. 12 (A) and FIG. 12 (B) show, arrangement | positioning of the precedent pile 42 (preceding pillar 52) and the post-construction pile 44 (post-construction pillar 54) is changeable suitably.

  Moreover, although the preceding pile 42 and the post-construction pile 44 are made into cast-in-place piles in the said embodiment, the said embodiment is not restricted to this. The preceding pile and the post-construction pile may be, for example, prefabricated piles. Also, the post-construction pile 44 can be omitted as appropriate, and, for example, all the piles may be constructed before the construction of the frame 50. Moreover, in the said embodiment, the foundation 40 may be not only a pile foundation but a direct foundation.

  Further, the structures of the leading column 52 and the post-construction column 54 are appropriately changed, and may be, for example, a steel frame, a CFT, a reinforced concrete, or a steel-framed reinforced concrete.

  Moreover, in the said embodiment, although the existing installation 20 contains the station 22, the said embodiment is not restricted to this. The existing facilities may be, for example, roads, facilities, structures and the like. In addition, the upper structure constructed on the frame 50 may be artificial ground or the like.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to such Embodiment, You may use it combining suitably one Embodiment and various modifications, The summary of this invention Of course, various modifications can be made without departing from the scope of the invention.

10 Structure 44 Post-Construction Pile 50 Structure 52 Leading Column 54 Post-Construction Column 58 Beam (Horizontal Member)

Claims (3)

A frame construction step of constructing a frame having a pair of leading columns and a horizontal member supported by the pair of leading columns;
A post-construction pillar construction step of constructing a post-construction pillar supporting the horizontal member next to the leading pillar;
Construction method of the structure provided with After the frame construction process, comprising a post-construction pile construction process of constructing a post-construction pile for supporting the post-construction column,
The construction method of the structure of Claim 1. In the post-construction pile construction step, at least a part of the post-construction pile is constructed from above the horizontal member,
The construction method of the structure of Claim 2.