JP3835716B2 - Reinforced concrete pier construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a reinforced concrete pier.
[0002]
[Prior art]
Reinforced concrete piers are conventionally constructed as follows.
14A and 15B are explanatory views showing a conventional method for constructing a concrete pier.
In the conventional construction method, first, as shown in FIG. 14A, after the foundation portion 102 (footing portion) is constructed, the work scaffold 104 is assembled on the four outer surfaces of the concrete pier to be constructed.
Next, an operator gets on the work scaffold 104 and assembles a reinforcing bar 106 such as a bending main material and a strip reinforcing bar, and then assembles a concrete formwork 110 using a separator and a support 108.
Next, concrete is placed in the concrete formwork 110, and after the concrete is hardened, the support 108 and the concrete formwork 110 are disassembled and removed, and the construction of the first lift is completed.
After the second lift, as shown in FIG. 14 (B) and FIG. 15 (A), the same work as the first lift is performed using the lifting machine 112, and the piers are sequentially built upward. The concrete pier 114 is constructed as shown in FIG.
[0003]
[Problems to be solved by the invention]
However, in such a conventional construction method, since the reinforcing bar assembly such as the bending main material and the band reinforcing bar is performed on the work scaffold, the reinforcing bar assembly is a very laborious work, and further, it is performed on the work scaffold. A lifting machine is required for all the rebar assembly and formwork assembly and disassembly, requiring a lot of temporary materials and personnel, and there was a problem that the construction period could not be shortened.
[0004]
The present invention has been devised in view of the above circumstances, and the object of the present invention is to reinforce the rebar assembling work and the lifting machine work on the work scaffold, shorten the construction period, and reduce the cost. The purpose is to provide a method for constructing piers.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a method for constructing a solid reinforced concrete pier having a rectangular cross section, which is a rectangular plate-shaped formwork body made of precast concrete, and bulges from the inner surface of the formwork body. A plurality of ribs extending between the long sides facing each other in parallel to the short sides of the rectangle and spaced in the extending direction of the long sides of the rectangle, and the extending direction of the short sides of the rectangle A plurality of intermediate portions are embedded in the rib and spaced apart from the inner surface of the mold body, and the length of the mold body is parallel to the inner surface of the mold body and the long side of the rectangle. Provided a concrete mold frame consisting of a strip reinforcing bar extending over the entire length in the side direction and a metal fitting for attaching the separator embedded and fixed to the inner surface of the mold body, away from the construction site of the concrete structure In place, a plurality of the concrete formwork bodies are arranged in a line in the extending direction of the long side of the formwork body, and the end faces of the formwork body of the adjacent concrete formwork bodies are brought into contact with each other, The first formwork component is formed by fixing together with a connector attached between the inner surfaces of the adjacent concrete formwork bodies, and at the place away from the construction place of the concrete structure, A concrete formwork which is disposed opposite to each other, and is arranged with intermediate strips by engaging both ends of the concrete rebar constituting the first formwork structure with both ends of the rebars. They are connected to each other by a separator coupled to a separator mounting bracket to form a second formwork structure, and a bending main material is erected at the construction site of the concrete structure, and two at the construction site of the concrete structure. A concrete placement space in which the rib extends in the vertical direction and includes the bending main material and extends in the vertical direction in the first formwork structure and the one second formwork structure. Are arranged in a rectangular frame shape in plan view so as to be partitioned, and both ends of the concrete formwork constituting the two first formwork constructs are engaged with the rebars to arrange the intermediate rebars. In addition, the concrete mold bodies are connected to each other by a separator coupled to a separator mounting bracket, and the adjacent concrete mold bodies are fixed to each other by a connector attached between their inner surfaces, whereby the first and second concrete mold bodies are fixed. The formwork structure is connected to form a rectangular form-like concrete formwork, and then the concrete is placed inside the concrete formwork.
[0006]
Further, the present invention provides a rectangular frame-shaped cross section having a hollow portion inside using an outer mold frame arranged in a rectangular frame shape and an inner mold frame arranged in a rectangular frame shape inside the outer mold frame. A rectangular plate-shaped formwork body made of precast concrete, and a bulge from the inner surface of the formwork body, with a gap in the extending direction of the long side of the rectangle. And a plurality of ribs formed extending between the long sides facing each other in parallel with the short side, and a plurality of intermediate portions embedded in the ribs at intervals in the extending direction of the short sides of the rectangle. A strip reinforcing bar that is spaced from the inner surface of the mold body and extends over the entire length of the long side of the mold body parallel to the inner surface of the mold body and the long side of the rectangle, and the mold body Separator embedded and fixed inside A concrete formwork composed of mounting brackets is provided, and a plurality of the concrete formwork bodies are arranged in a line in the extending direction of the long side of the formwork body at a place away from the construction part of the reinforced concrete pier. A first formwork structure in which the end faces of the formwork main bodies of the adjacent concrete formwork bodies are brought into contact with each other and fixed to each other by a connector attached between the inner surfaces of the adjacent concrete formwork bodies. Forming at least one first formwork construct for forming the outer formwork and at least one for forming the inner formwork at a location away from the construction location of the reinforced concrete pier The first formwork construct, or at least one of the first formwork construct for forming the outer formwork and one of the concrete for forming the inner formwork And an intermediate strip is disposed by engaging both ends of the concrete mold frame opposite to each other, and the opposing concrete mold frames are separated from each other by a separator mounting bracket. Are connected by a separator coupled to each other to form four second formwork constructs, a bending main material is erected at the construction location of the concrete structure, and the four second construction bodies are constructed at the construction location of the concrete structure. A concrete placement space in which the ribs extend in the vertical direction and the bending main material is included between the outer mold frame and the inner mold frame to extend in the vertical direction. Are arranged so as to be partitioned, and the adjacent concrete molds forming the outer mold and the adjacent concrete molds forming the inner mold are attached across their inner surfaces. The second formwork components are connected to each other by a tie to form a rectangular form concrete formwork in plan view, and then the outer formwork and the inner formwork of the concrete formwork It is characterized by placing concrete between the two.
[0007]
Further, the present invention is characterized in that the placing of the concrete is performed after a plurality of the concrete molds are stacked.
Further, the present invention is characterized in that the bending main material is added as the height of the reinforced concrete pier increases as the concrete is placed.
Further, the present invention is characterized in that a plurality of crack dispersion bars are embedded in the inside of the mold body.
Further, the present invention is characterized in that a distance between the inner surface of the formwork main body and the rebar is set to be equal to or greater than a maximum aggregate size in the concrete to be placed on the concrete formwork.
[0008]
In the method for constructing the solid reinforced concrete pier of the present invention, the first formwork construct is assembled with the concrete formwork at a place away from the construction place of the concrete pier, and further, the first formwork construct, A second formwork construct is assembled using an intermediate band, a separator, and the like. Then, after the bending main material is erected at the construction site of the concrete pier, the concrete formwork can be completed simply by combining and connecting the first and second formwork constructs.
[0009]
In the method for constructing the hollow reinforced concrete pier according to the present invention, the first mold is first assembled with the concrete mold body at a location apart from the construction location of the concrete pier, and then the first mold. A second formwork structure is assembled using the frame structure, the intermediate band, the separator, and the like. Then, after the bending main material is erected at the construction site of the concrete pier, the concrete formwork can be completed by simply combining and connecting the plurality of second formwork components.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described based on examples with reference to the drawings.
In the following, a concrete formwork used in a method for constructing a solid reinforced concrete pier will be described first with reference to FIGS.
2 is an exploded plan view of the concrete mold, FIG. 3 is a front view of the inside of the concrete mold, FIG. 4 is a perspective view of the concrete mold, FIG. Is an enlarged cross-sectional view of a concrete mold body, and (C) is an enlarged cross-sectional view of a rib portion.
[0011]
As shown in FIG. 2, in this embodiment, a rectangular form frame for constructing a concrete pier is formed by eight concrete form bodies. More specifically, the long sides of the mold are each constituted by two first concrete molds 6, and the short sides are respectively constituted by two second concrete molds 8.
[0012]
The first and second concrete mold bodies 6 and 8 include a mold body 10 made of a precast concrete plate, and the mold body 10 has an upper side and a lower side facing each other in parallel with each other, and a left side shorter than the upper side and the lower side. And a right side, and a bent portion 12 is formed on one side in the left-right direction of the mold body 10 of the second concrete mold body 8.
The thickness of the mold body 10 is about 50 mm to 100 mm, and reinforcing bars, fibers or fibers are used as reinforcing materials so that cracks do not occur during transportation and post-casting concrete placement.
Further, the inner surface 14 of the mold body 10 is subjected to a rough surface finish such as a brushing process or a washing process so as to be integrated with the post-cast concrete.
[0013]
On the inner surface 14 of the mold body 10, in order to cope with the lateral pressure of the post-cast concrete, as shown in detail in FIG. 5C, ribs 16 having a trapezoidal cross section are provided at a plurality of positions spaced in the left-right direction. Further, the mold body 10 is formed so as to extend up and down over the upper side and the lower side of the mold body 10, and the rigidity of the mold body 10 is enhanced.
The interval between the ribs 16 is appropriately determined in consideration of the placement height of the post-cast concrete, slump, concrete temperature, and placement speed.
As shown in FIGS. 5B and 5C, a plurality of crack dispersion bars 18 are embedded in the formwork body 10 in a lattice shape in the vertical and horizontal directions.
[0014]
The band rebar 20 has an intermediate portion embedded in the rib 16 and is formed to extend in parallel with the inner surface 14 and the upper and lower sides at a distance from the inner surface 14 of the mold body 10. As shown, a plurality are provided at intervals in the extending direction of the left and right sides.
In the first concrete formwork 6, the band reinforcing bar 20 is formed to have a length protruding from the left and right sides of the formwork body 10 as shown in FIGS. 2 and 4. Bending portions 13 and 15 are provided at both ends of the band reinforcing bar 20, respectively. The bent portion 13 is formed in a U shape, while the bent portion 15 is formed in an L shape. This is so that when the first and second concrete mold bodies 6 and 8 are connected to assemble the concrete mold frame, the end of the band rebar 20 protrudes from the inner surface 14 of the mold body 10 at a right angle. Because.
Further, in the second concrete mold body 8, as shown in FIGS. 2 and 3, the band reinforcing bar 20 is formed so that only one end protrudes from the side of the mold body 10, For the same reason as in the case of the first concrete mold 6, bent portions 13 and 15 are provided at both ends of the band reinforcing bar, respectively.
The distance between the inner surface 14 of the mold body 10 and the strip reinforcing bars 20 is preferably equal to or larger than the maximum coarse aggregate size in consideration of the filling property of the concrete when the post-cast concrete is placed.
[0015]
As shown in FIG. 5 (A), a connecting bracket mounting bracket for connecting the concrete mold bodies to each other at positions near the edges of the upper, lower, left and right sides of the mold body 10 of each concrete mold body. Are embedded at predetermined intervals over the entire length of the edge. In the embodiment, embedded bolts 22 are used as connecting metal fittings.
In addition, as shown in FIG. 6, separator mounting brackets for attaching a separator are embedded and fixed to the inner surface 14 of each mold body 10 at a plurality of positions spaced apart from each other in the vertical and horizontal directions of each mold body 10. In the embodiment, an embedded bolt 26 is used as a separator mounting bracket, and the tip of the embedded bolt 26 protrudes from the tip surface of the rib 16.
[0016]
In the concrete pier construction method of the present embodiment, the concrete pier is constructed in the following procedure using the first and second concrete mold bodies 6 and 8 as described above.
First, two types of first types for forming a rectangular concrete form in plan view using the first and second concrete form bodies 6 and 8 at places apart from the construction place of the pier. The formwork structure A and the first formwork structure B are assembled. FIG. 1 is a plan view showing each formwork structure.
[0017]
Two first concrete formwork bodies 6 are used for assembling the first formwork structure A. That is, as shown in FIG. 1, two first concrete mold bodies 6 are prepared, and the two first concrete mold bodies 6 are molded in a state in which the bent portion 13 of the band reinforcing bar 20 is on the outside. The frame main body 10 is arranged in a line in the extending direction of the long side. Then, the end surfaces of the mold body 10 of the first and second concrete mold bodies 6 and 8 adjacent to each other are brought into contact with each other and fixed to each other by a connector attached between the inner surfaces 14 of the adjacent mold bodies 10. Thus, the first formwork structure A is formed. In the present embodiment, two first formwork structures A are assembled.
As shown in FIG. 5A, the mold body 10 is connected by a connecting tool 40. The connecting tool 40 allows the embedded bolt 22 to pass therethrough, and a nut 42 is fastened to the tip of the embedded bolt 22. Secure with.
[0018]
On the other hand, two second concrete formwork bodies 8 are used for assembling the first formwork structure B. That is, as shown in FIG. 1, two second concrete mold bodies 8 are prepared and the bent portion 13 is on the outside, and then the two second concrete mold bodies 8 are formed into the mold frame. The main body 10 is arranged in a line in the extending direction of the long side. Then, the end surfaces of the mold body 10 of the adjacent second concrete mold body 8 are brought into contact with each other, and between the inner surfaces 14 of the adjacent mold body 10 as in the case of the first mold body A. The first formwork construct B is formed by being fixed to each other by a connecting tool attached over the first. In the present embodiment, two first formwork structures B are also assembled.
[0019]
Next, the second formwork construct 28 is assembled by the first formwork construct A, the intermediate strip 44, and the separator 24. That is, as shown in FIG. 1, the two first formwork constructs A are arranged to face each other, and the intermediate strip 44 and the separator 24 are attached between them.
The intermediate band 44 extends substantially orthogonally to the mold body 10, and both ends thereof are locked to the band reinforcing bars 20 of the first concrete mold frame 6 to extend the long side of the mold body 10. In the present embodiment, six are arranged at intervals in the present direction. In this case, it is optional to provide a locking tool such as a hook at both ends of the intermediate band 44. The intermediate rebar 44 is arranged for each of the rebars 20 arranged vertically.
As shown in FIG. 6, the separator 24 is attached between the opposing mold bodies 10 via embedded bolts 26.
For example, the separator 24 has an L-shaped support edge 46 attached to one end, a first rod 48 with a right-hand thread formed at the other end, and an L-shaped support edge 46 attached to one end. A second rod 52 having a right-hand thread at the end, a turnbuckle 54 that meshes with the right-hand thread of the first rod 48 and a left-hand thread of the second rod 52, and the like. A plurality of separators 24 are arranged orthogonal to the mold body 10 at a plurality of positions spaced in the vertical direction.
[0020]
Thereafter, a mold is formed at the pier construction site using the second mold frame assembly 28 and the first mold frame structure B assembled as described above, and concrete is cast to construct the pier.
FIG. 7 is an explanatory view showing the construction of the foundation and the bending main material, FIG. 8 is a process diagram showing the construction procedure of the concrete pier, and FIG. 9 is an explanatory view of the bending main material.
First, as shown in FIG. 7 at the concrete pier location to be constructed, after the foundation portion 30 (footing portion) is constructed, work scaffolds 32 are assembled on the four outer surfaces of the concrete pier to be constructed. The bending main material 34 is erected.
As shown in FIGS. 9A and 9B, the bending main member 34 is spaced in the extending direction of the four reinforcing bars 36 so that the four reinforcing bars 36 are positioned at the corners of the square. At a plurality of locations, an assembly bar 38 or a plate is interposed between the four reinforcing bars 36, and the four reinforcing bars 36 are held at each corner of the square.
[0021]
As shown in FIG. 8A, such a bending main material 34 is arranged in the periphery of the formwork installation place 32 having a rectangular shape in plan view, but at the four corners of the formwork installation place 32. At this stage, the bending main material 34 is not installed.
Next, the 2nd formwork structure 28 is lifted with a lifting machine, and it arrange | positions to the formwork installation location 32 on the base part 30, as shown to (B) of FIG. At that time, the ribs 16 extend in the vertical direction, the bending main material 34 becomes the inner side, and each mold body 10 extends along the long side of the mold installation location 32.
[0022]
Subsequently, the two first formwork constructs B are sequentially lifted by a lifting machine, and are respectively disposed at both ends of the second formwork construct 28 as shown in FIG. At that time, the ribs 16 extend in the vertical direction, the bending main material 34 becomes the inner side, and each mold body 10 extends along the short side of the mold installation location 32.
[0023]
Then, as shown in FIG. 8D, the end surface of the bent portion 12 of the mold body 10 that forms each first mold body B and the mold body that forms the second form body 28 In a state where the corresponding left and right end faces of 10 are in contact with each other, the mold body 10 is connected by the connecting tool 40 as shown in FIG. The connecting tool 40 is fixed by inserting the embedded bolt 22 and tightening the nut 42 at the tip of the embedded bolt 22.
Thereafter, the intermediate strip 44 and the separator 24 are attached between the two first formwork structures B facing each other in the same manner as in the case of the second formwork structure 28.
Thereby, as shown to (D) of FIG. 8, the concrete formwork 2 is formed on the foundation part 30 (FIG. 7). By repeating the above steps, for example, about four times, the concrete formwork 2 is stacked up and down in four stages as shown in FIG. 10, and as a result, a concrete placement space extending up and down is formed inside the concrete formwork 2. Is done.
Then, bending main members 34 are erected on the four corners of the base portion 30, and concrete 42 is placed in the formwork as shown in FIG. 8E, and the concrete 42 has a predetermined hardness. It is cured until it becomes.
Thereby, the pier for one lift which uses the concrete formwork 2 as a surface member is completed.
Thereafter, as shown in FIG. 10, by repeating the work of adding the bending main material 34 through the joint 3402, assembling and stacking the concrete formwork 2, and placing the concrete 42, the concrete pier has a required height. Build up to.
[0024]
As described above, in the solid reinforced concrete pier construction method of the present embodiment, the first formwork body B including the reinforcing bars such as the strip reinforcing bars 20 and the separator 24 and the separator 24 are provided at a location away from the construction location of the concrete pier. The complete concrete formwork 2 can be formed by assembling the two formwork structures 28 and simply connecting them by combining the bending main members 34 upright at the construction site of the concrete pier.
Therefore, the work on the work scaffold and the work by the lifting machine are greatly reduced, and the assembled concrete formwork 2 becomes the surface member of the pier as it is, so that the work of disassembling the concrete formwork 2 becomes unnecessary. As a result, it is possible to reduce the number of workers and shorten the construction period.
[0025]
Furthermore, in the construction method of the reinforced concrete pier of the present embodiment, after the concrete formwork 2 is completely assembled, it is not installed at the construction position of the concrete pier, but is partially assembled and the first formwork structure B and The second formwork constituting body 28 is used, and they are lifted by a lifting machine, and are installed and assembled at the construction site of the concrete pier to form a complete concrete formwork 2.
Therefore, even when the concrete formwork 2 is large as a whole, a relatively small lifting machine may be used, and a large lifting machine is unnecessary, which is advantageous for cost reduction.
[0026]
In the present embodiment, the first formwork structure A is configured by using the two first concrete formwork bodies 6. However, the number of the first concrete formwork bodies 6 is not limited to 2, and is 3 or more. Of course, it is possible. The same applies to the first formwork structure B.
Furthermore, in the present embodiment, the concrete mold 2 is configured by one second mold structure 28 and two first mold structures B. However, depending on the size of the concrete mold 2 required, etc. It is also possible to construct a concrete mold using two or more second formwork constructs 28 and three or more first formwork constructs B.
Further, in this embodiment, as the bending main material 34, as shown in FIG. 9, a structure in which four reinforcing bars 36 are assembled is used. However, this is only an example, and a necessary bending force is obtained. As long as it can be ensured, not only this example but various bending main materials can be used.
In addition, although the present Example demonstrated the case where a concrete pier was constructed | assembled as a concrete structure, this invention can be widely applied to concrete structures other than a concrete pier.
[0027]
Next, a case where a hollow concrete pier is constructed will be described.
FIG. 12 is an exploded plan view of a concrete mold used for constructing a hollow concrete pier in this embodiment. In the figure, the same elements as those in FIG.
As shown in FIG. 12, in this embodiment, a rectangular formwork for constructing a concrete pier is formed by 14 concrete formwork bodies. More specifically, each of the long sides of the formwork uses two each of the first concrete formwork body 6 and the third concrete formwork body 50, and each short side part of the formwork has Two second concrete mold bodies 8 and one fourth concrete mold body 56 are used.
Then, the first and second concrete mold bodies 6 and 8 form an outer mold form, and the third and fourth concrete mold bodies 50 and 56 form an inner mold form.
[0028]
The third and fourth concrete mold bodies 50 and 56 have basically the same configuration as the first and second concrete mold bodies 6 and 8 already described in the above embodiment.
The third concrete mold body 50 has basically the same structure as that of the first concrete mold body 6, but the third concrete mold body 50 has a mold body for forming an inner mold frame. The length of the long side 10 is short, the protruding distance of the bent portions 58 and 60 of the band reinforcing bar 20 from the inner surface 14 of the mold body 10 is short, and the bent portion 58 protrudes greatly from the end surface of the mold body 10. Yes. The ribs 16 are formed at positions facing the ribs 16 of the first concrete mold body 6 when the concrete mold is formed.
[0029]
The fourth concrete mold body 56 has basically the same structure as that of the first concrete mold body 6, but the fourth concrete mold body 56 is opposed to the second concrete mold body 8. The length of the long side of the mold body 10 is shorter than the length connecting the two second concrete mold bodies 8 in order to arrange and constitute a part of the inner mold frame, Are bent in a U-shape, and the protruding distance from the end surface of the mold body 10 is long. And the rib 16 is formed in the position facing the rib 16 of the 2nd concrete mold body 8 when a concrete mold is formed.
[0030]
In the concrete pier construction method of this embodiment, a hollow concrete pier is constructed by using the first to fourth concrete mold bodies 6, 8, 50, and 56 in the following procedure.
First, three types of the first and third concrete mold bodies 6, 8, and 50 for forming a concrete mold having a rectangular shape in plan view are provided at locations apart from the construction site of the pier. Assembling one formwork structure A, first formwork structure B, and first formwork structure C.
FIG. 11 is a plan view showing each formwork structure.
The assembly of the first formwork structure A and the first formwork structure B may be performed in the same procedure as in the above embodiment, and thus detailed description thereof is omitted here.
Two third concrete formwork bodies 50 are used for assembling the first formwork structure C. That is, as shown in FIG. 11, two third concrete mold bodies 50 are prepared, and the two third concrete mold bodies 56 are molded in a state where the bent portion 58 of the band reinforcing bar 20 is on the outside. The frame main body 10 is arranged in a line in the extending direction of the long side. Then, the end surfaces of the mold body 10 of the adjacent third concrete mold body 50 are brought into contact with each other, and are fixed to each other by a connector attached across the inner surface 14 of the adjacent mold body 10. Formwork structure C is formed. In the present embodiment, two first formwork structures C are assembled.
As shown in FIG. 5A, the mold body 10 is connected by a connecting tool 40. The connecting tool 40 allows the embedded bolt 22 to pass therethrough, and a nut 42 is fastened to the tip of the embedded bolt 22. Secure with.
[0031]
Next, the 2nd formwork structure 63 is assembled with the 1st formwork structure A and the 1st formwork structure C in the place away from the construction place of the pier.
That is, as shown in FIG. 11, the first formwork structure A and the first formwork structure C are arranged in a state where the respective rebars 20 are horizontal and the positions in the extending direction coincide with each other. These are arranged opposite to each other with a space therebetween.
Then, the intermediate strip 44 and the separator 24 are attached between the first formwork structure A and the first formwork structure C.
The intermediate band 44 extends substantially orthogonally to the mold body 10, and both ends thereof are locked to the band reinforcing bars 20 of the first and third concrete mold bodies 6, 50 facing each other. In the present embodiment, six are arranged at intervals in the extending direction of the long side of the main body 10. In this case, it is optional to provide a locking tool such as a hook at both ends of the intermediate band 44. The intermediate rebar 44 is arranged for each of the rebars 20 arranged vertically.
As shown in FIG. 6, the separator 24 is attached between the opposing mold body 10 via embedded bolts 26, and a plurality of separators 24 are orthogonal to the mold body 10 at a plurality of positions spaced in the vertical direction. Arrange.
[0032]
Subsequently, the second formwork construct 65 is assembled by the first formwork construct B and the fourth concrete formwork 56 at a place away from the construction site of the pier. That is, as shown in FIG. 11, the first formwork component B and the fourth concrete formwork 56 are placed in a state where the respective rebars 20 are horizontal and the positions in the extending direction coincide with each other. These are arranged opposite to each other with a space therebetween.
Then, the intermediate strip 44 and the separator 24 are attached between the first formwork construct B and the fourth concrete formwork 56 in the same manner as the second formwork construct 63.
[0033]
Thereafter, a mold form is formed at a pier construction site using the second mold structure member 63 and the second mold member structure 65 assembled as described above, and concrete is placed to construct a pier.
(A) thru | or (F) of FIG. 13 is process drawing which shows the construction process of a concrete pier.
[0034]
First, as shown in FIG. 7, in this case as well, as shown in FIG. 7, after the foundation portion 30 is constructed, work scaffolds 32 are assembled on the four outer surfaces of the concrete pier to be constructed. Erected a plurality of bending main members 34.
As shown in FIG. 13A, the bending main members 34 are arranged in the peripheral part of the mold installation place 64 having a rectangular shape in plan view. At this stage, only the long side part of the mold installation place 64 is arranged. It is disposed and not disposed in the vicinity of both ends of the long side portion.
[0035]
Next, the two second formwork constructs 63 are sequentially lifted by a lifting machine and placed at the formwork installation location 64 on the foundation 30. At that time, as shown in FIG. 13B, the ribs 16 extend in the vertical direction, the bending main material 34 becomes the inner side, and each mold body 10 extends along the long side of the mold installation place 64. To extend.
Subsequently, the two second formwork components 65 are sequentially lifted by a lifting machine, and are respectively disposed at both ends of the second formwork structure 63. At that time, as shown in FIG. 13C, the ribs 16 extend in the vertical direction, and each mold body 10 extends along the short side of the mold installation location 64.
[0036]
Then, the end surface of the bent portion 12 of the mold body 10 constituting each second formwork construct 65 is brought into contact with the corresponding left and right end surfaces of the mold body 10 constituting the second formwork construct A. In this state, the mold body 10 is connected by the connecting tool 40 as shown in FIG.
Thereby, as shown to (C) of FIG. 13, the concrete formwork 70 is formed on the base part 30. FIG. By repeating the above steps, for example, about four times, the concrete molds 70 are stacked up and down in four stages. As a result, the concrete molds 70 extend vertically inside the concrete mold 70 composed of the outer mold 66 and the inner mold 68. A concrete placement space is formed.
Then, as shown in (D) of FIG. 13, the bending main members 34 are respectively erected on the inner side of the second formwork structure 65, and as shown in (E) of FIG. 13, the inner mold In the vicinity of the inner surface 72 of the frame 68, a large number of reinforcing bars 74 as bending main members are provided along the inner surface 72 at intervals from each other. A plurality of reinforcing bars 74 are erected as a main material.
[0037]
Thereafter, as shown in FIG. 13F, concrete 42 is placed in the concrete mold 70 and cured until the concrete 42 has a predetermined hardness. Thereby, the pier for 1 lift which uses the concrete formwork 70 as a surface member is completed. Thereafter, the bending main material 34 is added, the concrete formwork 70 is assembled and stacked, and the concrete pier is constructed to a required height by repeating the work of placing and placing the concrete 42.
[0038]
Thus, in the construction method of the reinforced concrete bridge pier of the present embodiment, the second formwork structure 63 and the second mold including the reinforcing bars such as the band reinforcement 20 and the separator 24 in a place away from the construction place of the concrete pier. The frame structure 65 is assembled, the bending main material 34 is erected at the construction site of the concrete pier, and the second mold frame structure 63 and the second mold structure 65 are simply combined and connected. The complete concrete formwork 70 for building the hollow pier can be formed.
Therefore, the work on the work scaffold and the work by the lifting machine are greatly reduced, and the assembled concrete formwork 70 becomes the surface member of the pier as it is, so that the work of disassembling the concrete formwork 70 becomes unnecessary. As a result, it is possible to reduce the number of workers and shorten the construction period.
Furthermore, in the construction method of the reinforced concrete pier of the present embodiment, after the concrete formwork 70 is completely assembled, it is not installed at the construction place of the concrete pier, but is partially assembled and the second formwork structure 63 and The second formwork construct 65 is lifted by a lifting machine, and is installed and assembled at a construction site of a concrete pier to form a complete concrete formwork 70. Therefore, even when the concrete formwork 70 is large as a whole, a relatively small lifting machine may be used, and a large lifting machine is unnecessary, which is advantageous for cost reduction.
[0039]
In this embodiment, each of the first formwork structure A, the first formwork structure B, and the first formwork structure C is configured by using two concrete formwork bodies. Of course, the number of frames is not limited to two, but can be one or three or more.
Furthermore, in the present embodiment, the concrete mold 70 is configured by the two second formwork constructs 63 and the two second formwork constructs 65, but depending on the size of the required concrete formwork and the like. It is also possible to construct a concrete formwork with three or more second formwork constructs 63 and second formwork constructs 65.
In this embodiment, the second formwork component 65 is formed by the two second concrete formwork bodies 8 and one fourth concrete formwork body 56, but the fourth concrete formwork body As in the case of the second formwork structure 63, a plurality of 56 can be provided.
Further, in this embodiment, as the bending main material 34, as shown in FIG. 7, a main body composed of four reinforcing bars 36 is mainly used. However, this is merely an example, and a necessary bending pair 34 is used. As long as the force can be secured, not only this example but also various bending main materials 34 can be used.
[0040]
【The invention's effect】
As described above, in the solid reinforced concrete pier construction method of the present invention, the first formwork component is assembled by the concrete mold body at a location apart from the construction location of the concrete pier, and the first mold is further constructed. A second formwork construct is assembled using a frame construct, an intermediate band, a separator, and the like.
Then, after the bending main material is erected at the construction site of the concrete pier, the concrete formwork can be completed simply by combining and connecting the first and second formwork constructs.
Therefore, the work on the work scaffold and the work by the lifting machine are greatly reduced, and the assembled concrete formwork becomes the surface member of the pier as it is, so that the work of dismantling the concrete formwork becomes unnecessary. As a result, it is possible to reduce the number of workers and shorten the construction period.
Furthermore, in the method for constructing a reinforced concrete pier according to the present invention, after the concrete formwork is completely assembled, it is not installed at the construction site of the concrete pier, but is partially assembled to form the first formwork structure and the second formwork structure. Form the formwork, lift them with a lifting machine, and install and assemble them at the concrete pier construction site to form a complete concrete formwork.
Therefore, even when the concrete formwork is large as a whole, a relatively small lifting machine may be used, and a large lifting machine is unnecessary, which is advantageous for cost reduction.
[0041]
In the method for constructing a hollow reinforced concrete pier according to the present invention, the first formwork construct is first assembled with the concrete formwork at a place away from the construction place of the concrete pier, A second formwork construct is assembled with the formwork construct, the intermediate strip, the separator, and the like.
And at the construction site of the concrete pier, after the bending main material is erected, the concrete formwork for constructing the hollow reinforced concrete pier is completed simply by combining and connecting the second formwork components Can be made.
Therefore, the work on the work scaffold and the work by the lifting machine are greatly reduced, and the assembled concrete formwork becomes the surface member of the pier as it is, so that the work of dismantling the concrete formwork becomes unnecessary. As a result, it is possible to reduce the number of workers and shorten the construction period.
Furthermore, in the construction method of the reinforced concrete pier of the present invention, after the concrete formwork is completely assembled, it is not installed at the construction site of the concrete pier, but is partially assembled to form the second formwork structure. It is lifted by a lifting machine, installed at the construction site of a concrete pier and assembled to form a complete concrete formwork.
Therefore, even when the concrete formwork is large as a whole, a relatively small lifting machine may be used, and a large lifting machine is unnecessary, which is advantageous for cost reduction.
[Brief description of the drawings]
FIG. 1 is a plan view showing a formwork structure.
FIG. 2 is an exploded plan view of a concrete formwork.
FIG. 3 is an inner front view of a concrete mold body.
FIG. 4 is a perspective view of a concrete formwork body.
5A is an explanatory view of a connecting metal fitting, FIG. 5B is an enlarged sectional view of a concrete mold body, and FIG. 5C is an enlarged sectional view of a rib portion;
FIG. 6 is an explanatory view of separator attachment.
FIG. 7 is an explanatory diagram showing the construction of the foundation and the standing of the bending main material.
FIG. 8 is a process diagram showing a construction procedure of a concrete pier.
FIG. 9 is an explanatory diagram of a bending main material.
FIG. 10 is a perspective view of a concrete formwork.
FIG. 11 is a plan view showing a formwork structure.
FIG. 12 is an exploded plan view of a concrete formwork.
FIGS. 13A to 13F are process diagrams showing a construction process of a concrete pier.
FIGS. 14A and 14B are explanatory views showing a conventional method for constructing a concrete pier.
FIGS. 15A and 15B are explanatory views showing a conventional method for constructing a concrete pier.
[Explanation of symbols]
2,70 concrete formwork
A, B, C First formwork structure
6 First concrete formwork
8 Second concrete formwork
10 Formwork body
24 Separator
28, 63, 65 Second formwork structure
34 Bending main material
44 Midband muscle
50 Third concrete formwork
56 Fourth concrete formwork
64 Formwork installation location
66 Outside formwork
68 Inside formwork

Claims (6)

A method of constructing a solid reinforced concrete pier with a rectangular cross section,
A rectangular plate-shaped formwork body made of precast concrete, and the length that bulges from the inner surface of the formwork body and that is spaced in the extending direction of the long side of the rectangle and parallel to the short side of the rectangle A plurality of ribs extending between the sides, and a plurality of ribs are provided with intermediate portions embedded in the ribs at intervals in the extending direction of the short sides of the rectangle, respectively, A strip reinforcing bar extending over the entire length in the long side direction of the mold body in parallel with the inner surface of the mold body and the long side of the rectangle, and for attaching a separator embedded and fixed in the inner surface of the mold body Provide a concrete formwork consisting of metal fittings,
A plurality of the concrete mold bodies are arranged in a row in the extending direction of the long side of the mold body at a place away from the construction site of the concrete structure, and the mold body of the adjacent concrete mold body The end faces of each other, and fixed to each other by a connector attached between the inner surfaces of the adjacent concrete mold bodies to form a first formwork structure,
At the place away from the construction site of the concrete structure, the two first formwork components are arranged opposite to each other, and both ends are locked to the band reinforcement of the concrete formwork constituting the first formwork structure. The intermediate strips are disposed, and the concrete molds facing each other are connected to each other by a separator coupled to a separator mounting bracket to form a second formwork construct,
Bending main material is erected at the construction site of the concrete structure,
In the construction site of the concrete structure, the two first formwork constructs and one second formwork construct include the ribs extending in the vertical direction and the bending main material. With a rectangular frame shape in plan view so that the concrete placement space extending in the vertical direction is partitioned,
A separator in which both ends of the concrete formwork constituting the two first formwork constituting bodies are locked to both ends of the concrete reinforcement to dispose an intermediate rebar, and the concrete formwork is connected to a separator mounting bracket. The first and second formwork components are connected to each other by fixing the adjacent concrete molds to each other by a connector attached between the inner surfaces thereof, and the rectangular frame-shaped concrete in plan view Form the formwork,
Next, concrete was placed inside the concrete formwork,
The construction method of the reinforced concrete pier characterized by this. A reinforced concrete pier with a rectangular cross section having a hollow section inside is constructed using an outer mold frame arranged in a rectangular frame shape and an inner mold frame arranged in a rectangular frame shape inside the outer mold frame. A method,
A rectangular plate-shaped formwork body made of precast concrete, and the length that bulges from the inner surface of the formwork body and that is spaced in the extending direction of the long side of the rectangle and parallel to the short side of the rectangle A plurality of ribs extending between the sides, and a plurality of ribs are provided with intermediate portions embedded in the ribs at intervals in the extending direction of the short sides of the rectangle, respectively, A strip reinforcing bar extending over the entire length in the long side direction of the mold body in parallel with the inner surface of the mold body and the long side of the rectangle, and for attaching a separator embedded and fixed in the inner surface of the mold body Provide a concrete formwork consisting of metal fittings,
A plurality of the concrete formwork bodies are arranged in a line in the extending direction of the long side of the formwork body at a place away from the construction place of the reinforced concrete pier, and the formwork body of the adjacent concrete formwork body The end faces of each other are fixed to each other by a connector attached between the inner surfaces of the adjacent concrete mold bodies to form a first formwork structure,
At a location remote from the construction location of the reinforced concrete pier, at least one first mold structure for forming the outer mold and at least one first mold for forming the inner mold A frame structure or at least one first formwork structure for forming the outer formwork and one concrete formwork for forming the inner formwork are arranged to face each other. Both ends of the concrete formwork are locked to the rebar and an intermediate rebar is provided, and the opposing concrete formwork is connected by a separator coupled to a separator mounting bracket to form a second formwork. Forming four components,
Bending main material is erected at the construction site of the concrete structure,
At the construction site of the concrete structure, the four second formwork components, the ribs extend in the vertical direction, and the bending main material is placed between the outer formwork and the inner formwork. The concrete placement spaces that are arranged in such a manner that the concrete placement space extending in the vertical direction is partitioned, the adjacent concrete mold bodies that form the outer formwork, and the adjacent concrete that forms the inner formwork By fixing the formwork bodies to each other by a connector attached between their inner surfaces, the second formwork structure is connected to form a rectangular form-like concrete formwork in plan view,
Next, concrete was placed between the outer formwork and the inner formwork of the concrete formwork,
The construction method of the reinforced concrete pier characterized by this. The method for constructing a reinforced concrete pier according to claim 1 or 2, wherein the placing of the concrete is performed after a plurality of the concrete formwork are stacked. The method for constructing a reinforced concrete pier according to claim 1, 2 or 3, wherein the bending main material is added as the height of the reinforced concrete pier increases with the placement of concrete. The method for constructing a reinforced concrete pier according to any one of claims 1 to 4, wherein a plurality of crack dispersion bars are embedded in the inside of the mold body. The distance between the inner surface of the said formwork main body and the said strip reinforcement is set to be more than the largest aggregate size in the concrete cast in the said concrete formwork, The any one of Claims 1 thru | or 5 How to build a reinforced concrete pier.

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