JP2001152414A - Structural material for concrete pier and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structural material for a concrete block lessening the assembling of reinforcing bars at a job site, and excellent in workability. SOLUTION: A pillar part 2 is divided in the circumferential direction to form the substantially equal division structural material 5 as the length of the pillar part 2. The main reinforcement 15 of the length direction and the tie hoop 16 of the circumferential direction are buried in the division structural material 5. The division structural material 5 is assembled to fill the with concrete 43, the columnar part 2 of a pier 1 is constructed, and since the structural material 5 is provided with the main reinforcement 15 and the tie hoop 16, it is different from a single form, and itself is the structural material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structural material for a concrete pier forming a concrete pier and a method for constructing the same.

[0002]

Conventionally, a bridge pier is constructed by using a precast concrete product.
Japanese Patent Application Laid-Open No. 10-40414 discloses a process of forming a frame-shaped precast form member having a predetermined height, a step of attaching a reinforcing bar to the precast form member via a reinforcing bar frame, and a step of forming a reinforcing bar of a concrete pier. Building process,
A step of stacking a predetermined number of the precast form members around the rebar, and a method of constructing a concrete pier including a step of casting concrete in the stacked precast form members, According to this construction method, since a precast form member is used,
Eliminates the need to dismantle the formwork on site.

[0003] However, in the above-mentioned construction method, a belt reinforcing bar is attached to a precast form member via a reinforcing bar frame (JP-A-0011), and a steel frame such as H steel is erected at a concrete pier construction site ( Gazette No. 00
12 steps), and the precast mold member is
Instead of burying structural reinforcing steel, the formwork member is merely a formwork for filling concrete, and is an unnecessary part in structural calculations. Further, the precast form members are stacked up and down, and the next rebar is placed on the rebar and joined by, for example, bolts (Japanese Patent Publication No. 0018).
Therefore, the joining operation of the reinforcing bars in the vertical direction is complicated.

[0004] Therefore, an object of the present invention is to provide a structural material for a concrete pier and a method for constructing the same, which reduce the on-site rebar assembly and have excellent workability.

[0005]

The invention according to claim 1 is a structural material for a concrete pier made of precast concrete, which forms the outer periphery of a columnar portion of a concrete pier and fills the inside with concrete to form a pier. Then, the columnar portion is divided in the circumferential direction to form a divided structural material substantially equal to the length of the columnar portion, and a main reinforcing bar in the longitudinal direction and a band reinforcing bar in the circumferential direction are embedded in the divided structural material, A connecting portion of the reinforcing bar is provided on a local end side of the structural material.

According to the first aspect of the present invention, the divided structural member is assembled and filled with concrete to construct the columnar portion 2 of the pier, and the divided structural member is provided with the main reinforcing bar and the strip reinforcing bar. Unlike the formwork itself becomes a structural material,
In particular, the main reinforcement is continuous without any joints, so that the construction is easy and the strength is highly reliable.

Further, the invention according to claim 2 is that the connecting portion has a loop shape.

According to the second aspect of the present invention, it is possible to easily and firmly connect the belt reinforcing bars by inserting the vertical reinforcing bars into the loop portions in a state of being superposed on the loop portions.

The invention according to a third aspect is characterized in that a rib portion is provided on the inner surface of the divided structural member.

According to the structure of the third aspect, the strength is excellent, and the stability is excellent during transportation and in the standing state.

According to a fourth aspect of the present invention, the divided structural member according to the second aspect is assembled in a circumferential direction, a vertical reinforcing bar is inserted into adjacent connecting portions, and the connecting portions are connected to each other. This is a construction method in which the structural material is filled with concrete and integrated.

According to the structure of the fourth aspect, in a state in which a plurality of loop portions are overlapped, a vertical reinforcing bar can be inserted into the loop portion to easily connect the plurality of band reinforcing bars to each other. It will be excellent in property.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 9 show a first embodiment of the present invention.
In the embodiment, as shown in FIG.
And the overhang portion 3 provided on the upper portion of the columnar portion 2,
A foundation 4 (footing) is provided below the columnar portion 2. The columnar portion 2 has a circular cross section, and the divided structural member 5 has a shape obtained by dividing the outer periphery of the columnar portion 2 into three.
The divided structural member 5 has a rib portion 7 protruding from a central inner surface of an arc portion 6 having a substantially constant thickness, and one end in a circumferential direction has inner and outer bulging portions 8 and 9 bulging inward and outward. And the other end has
It has inner and outer bulging portions 10 and 11 that bulge inward and outward, and a recess 12 is formed between the inner and outer bulging portions 10 and 11. A continuous end face 13 is formed at one end, and end faces 14, 14 divided by the recess 12 are formed at the other end.
A and 14B are formed, the end faces 13, 14, and 14A and the tip end face 7T of the rib portion 7 are on the same plane, and the other end is provided with an end face 14B outside the end face 14B. In.

A main reinforcing bar 15 such as a reinforcing steel bar or an H-beam is embedded in the divided structural member 5 over substantially the entire length thereof, and a band reinforcing bar 16 in the circumferential direction is embedded therein. The upper end of the anchor member 15A projects upward from the upper end in the height direction of the divided structural member 5, the lower end of the main bar 15 projects downward from the lower end in the height direction of the divided structural member 5, and the lower end is bent in the cross direction. Is formed. One end of the strip reinforcing bar 16 protrudes from the end face 13 and is folded back in a semicircular loop to form a loop portion 17 serving as a connecting portion. The other end of the reinforcing bar 16 protrudes from the recess 12 and is folded back into a semicircular loop to form a loop portion 17.
The end portion 17A of the loop portion 17 is connected to the reinforcing bar 16 in the divided structural member 5. Then, by joining the end portions of the adjacent divided structural members 5, the end surface 14B and the end surface 13 abut against each other, and the outer bulging portions 9 and 11 become the mounting rib portions 18 protruding from the outer periphery.

The overhang portion 3 is a concrete assembly frame.
The assembly frame 21 is composed of precast concrete divisions 22, 22 divided into two in the width direction. The assembly frame 21 is provided with a plurality of walls 23 at intervals in the length direction. The assembling frame 21 has an upper surface formed with a charging hole 24 for charging concrete, and a lower surface center formed with a communicating hole 25 communicating with the inside of the assembled divided structural members 5, 5, 5. The hole 25 is formed slightly smaller than the outer diameter of the column 2. An engagement protrusion 26 is provided on one of the butting surfaces 23A, 23A of the wall portion 23, and an engagement groove 27 into which the engagement protrusion 26 is engaged is provided on the other. Further, the divided body 22 is temporarily assembled between the side walls 28 on both sides in the width direction by a tightening member 29 inserted through the walls 23, 23.
Consists of two screw bolts 29A and nuts 29B, 29B screwed to the two screw bolts 29A.

Reference numeral 31 denotes a basic version section.
Steel materials 32 such as H-section steel are arranged in a grid pattern in the front-rear and left-right directions, and a plurality of rebars 33 are arranged in the front-rear and left-right directions, and the steel materials 32 and the rebars 33 are embedded in concrete 34 having a substantially constant thickness. It was done. In addition, the base plate section 31
Above is provided a temporary supporter 35, which is
The lower part is fixed to the steel material 32 of the basic slab part 31, and a fixing part 36 for fixing the lower part of the divided structural material 5 is provided above the temporary supporter 35. Have been. The plurality of anchor bolts 37 of the divided structural member 5 are fixed, and the lower ends of the anchor bolts 37 are projected downward, and the anchor bolts 37 are inserted into the holes 36A of the fixing portion 36. The nuts 38, 38A for height adjustment are screwed on the upper and lower sides of the nuts.
By loosening 38A, the divided structural member 5 is attached to the temporary supporter 35 so that the height can be adjusted. Then, the temporary supporter 35 is buried in the foundation 4 formed of cast-in-place concrete.

Next, an example of a method of constructing the pier 1 according to the present invention will be described. First, the divided structural member 5 is a structure in which the outer periphery of the columnar part 2 is divided into three parts. Even the one corresponding to the large columnar part 2 can be carried on a vehicle to the site. Also, the assembling frame 21 corresponding to the overhang portion 3 can be transported on a vehicle because the divided bodies 22, 22 are divided into two in the width direction. Then, at the site, the base plate portion 31 is formed, and the temporary supporter 35 is formed on the base plate portion 31. Next, the divided structural members 5 are erected on the temporary supporters 35, respectively, fixed by adjusting the height with nuts 38, 38A, and are vertically attached to the loop portions 17, 17 of the divided structural members 5, 5 adjacent in the circumferential direction. Insert the reinforcing bar 41 and tie wires such as wires
The two loop portions 17, 17 and the vertical reinforcing bar 41 are bound by the 42, thereby connecting the loop portions 17, 17 and connecting the band reinforcing bar 16 in the circumferential direction of the columnar portion 2. And in this example, the loop part 17,
Four vertical reinforcing bars 41, 41, 41, 41 are inserted into the 17, and the two vertical reinforcing bars 41 are connected to the overlapping portions of the loop portions 17, 17 by binding wires 42.
United by After fixing the anchor bolt 37 of the divided structural member 5 to the temporary supporter 35, the foundation 4 is formed by cast-in-place concrete, and the main reinforcement is attached to the foundation 4.
The lower end of 15 is buried, and the divided structural member 5 is stably erected on the base portion 4. It should be noted that the divided structural members 5, 5, 5, 5
And lay it down in a columnar shape,
You may make it stand up and fix on 35. Then, the concrete 43 is filled from above the divided structural members 5, 5, 5 and the concrete 43 is filled to a position where the concrete upper surface 43A is lower than the upper ends of the divided structural members 5, 5, 5. The filling of the concrete 43 and the placing of the foundation 4 can be performed simultaneously. On the other hand, the divided bodies 22, 22 are fastened by the fastening members 29 to assemble the assembly frame 21, and the assembly frame 21 is placed on the divided structural members 5, 5, 5. In this case, the assembly frame 21 can be stably mounted on the divided structural members 5, 5, 5 by the plurality of mounting ribs 18. And from the input hole 24,
Concrete 43 is filled in the assembly frame 21, and the divided structural material 5
Since the main bar 15 protruding from the upper end of the
The columnar part 2 and the overhang part 3 are integrated.

As described above, in the present embodiment, according to the first aspect, the outer periphery of the columnar portion 2 of the concrete pier 1 is formed, and the concrete pier 1 is formed by filling the inside with the concrete 43 to form the pier 1. A structural material for a concrete pier, in which a pillar ridge 2 is divided in a circumferential direction to form a divided structural member 5 having a length substantially equal to the length of the columnar portion 2, and a main reinforcement 15 in a longitudinal direction is formed on the divided structural member 5. Since the circumferential reinforcing bar 16 is embedded and the loop portion 17 as a connecting portion of the reinforcing bar 16 is provided on the circumferential end side of the divided structural material 5, the divided structural material 5 is provided.
And the inside thereof is filled with concrete 43 to construct the columnar portion 2 of the pier 1. Since the divided structural member 5 includes the main reinforcing bar 15 and the band reinforcing bar 16, it is different from a mere formwork itself and becomes a structural material. The main bar 15 is continuous without any joints, which facilitates construction and has high strength in reliability.

Further, as described above, in this embodiment, claim 2
In response to the above, since the connecting portion has a loop shape, a vertical reinforcing bar is
By inserting 41, the belt reinforcing bars 16 can be easily and firmly connected to each other.

Further, as described above, in this embodiment, claim 3
Since the ribs 7 are provided on the inner surface of the divided structural member 5 in accordance with the above, the stability is excellent in the standing state.

As described above, according to the present embodiment, claim 4
Corresponding to the above, after assembling the divided structural member 5 according to claim 2 in the circumferential direction, inserting the vertical reinforcing bar 41 into the adjacent loop portions 17, 17 and connecting the loop portions 17, 17. ,
Since the concrete 43 is filled in the assembled divided structural members 5, 5, 5 and integrated, the plurality of loop portions 17,
With the 17 superposed, the vertical reinforcing bars 41 can be inserted into the loop portions 17 and 17 to easily connect the plurality of band reinforcing bars 16 and 16 with each other, and the workability is excellent. In addition, as an effect on the embodiment, the divided structural member 5 has the end faces 13, 14,
Since 14A is on the same plane, the end faces 13, 14, 14A of the formwork
By filling the concrete with the corresponding position being horizontal, the end faces 13, 14, 14A can be easily formed, and furthermore, the end faces 13, 14, 14A and the tip face 7 can be formed.
Since T is on the same plane, manufacture is easier.
In this case, it is preferable to use highly fluid concrete. Further, the divided structural member 5 can be attached to the temporary supporter 35 so that the height can be adjusted. After the attachment, the temporary supporter 35 is buried in the concrete 35 to form the base portion 4, whereby the divided structural member 5 can be adjusted. Can be integrally fixed to the base portion 4. In addition, since the assembled divided structural members 5, 5, and 5 have the mounting rib portions 18, 18, the assembling frame 21 is divided into
It can be stably installed on 5,5. Further, the lower end of the main reinforcement 15 is buried in the base portion 4 and the anchor portion 15A in the orthogonal direction is provided at the lower end of the main reinforcement 15, so that the columnar portion 2 can be stably erected on the base portion 4.

FIG. 10 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted. 5A shows a divided structural material 5A used for the columnar portion 2A, and has a shape obtained by dividing the outer periphery of the columnar portion 2A into two.

Therefore, also in this embodiment, the split structural members 5A, 5A are assembled on site, the vertical reinforcing bars 41 are inserted into the loop portions 17, 17, and the loop portions 17, 17 are connected to each other by the binding wire 42 or the like. Then, by filling the inside with the concrete 43, the pillar ridge 2A can be constructed, and the same operation and effect as in the first embodiment can be obtained.

FIG. 11 shows a third embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. A divided structural member 5B used for the columnar portion 2B is shown, and the divided structural member 5B has a shape obtained by dividing the outer periphery of the columnar portion 2B into two.

Therefore, also in this embodiment, the split structural members 5B, 5B are assembled on site, the vertical reinforcing bars 41 are inserted into the loop portions 17, 17, and the loop portions 17, 17 are connected to each other by the binding wire 42 or the like. By filling the inside with the concrete 43, the columnar portion 2B can be constructed, and the same operation and effect as in the first embodiment can be obtained.

FIG. 12 shows a fourth embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. 5C shows a divided structural material 5C used for the columnar portion 2C, and the divided structural material 5C has a shape obtained by dividing the outer periphery of the columnar portion 2C into four parts.

Therefore, also in this embodiment, the split structural members 5C, 5C, 5C, 5C are assembled on site, the vertical reinforcing bars 41 are inserted into the loop portions 17, 17, and the loop portions 1
By connecting the members 7 and 17 to each other with a binding wire 42 or the like and filling the inside with concrete 43, the columnar portion 2C can be constructed, and the same operation and effect as in the first embodiment can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the present invention is applicable to columnar portions having various cross-sectional shapes. Also, if necessary, vertical and horizontal reinforcing bars can be arranged inside the assembled divided structural members. Further, in the embodiment, the example in which the strip rebars are connected by the binding wire is shown, but it may be connected by a connecting tool such as a coupler. Further, a mounting rib portion may be provided on the central outer surface side of the divided structural material.

[0029]

According to the first aspect of the present invention, there is provided a structural material for a concrete pier made of precast concrete, which forms an outer periphery of a columnar portion of a concrete pier and fills the interior with concrete to form a pier. The part is divided in the circumferential direction to form a divided structural material having a length substantially equal to the length of the columnar part. The connecting portion of the reinforcing bar is provided at the end portion in the direction, and the assembling of the reinforcing bar on the site is reduced, and a structural material for a concrete pier excellent in workability can be provided.

Further, according to the invention of claim 2, the connecting portion has a loop shape, and it is possible to provide a structural material for a concrete pier excellent in workability by reducing assembling of a reinforcing bar on site. .

Further, the invention according to claim 3 is characterized in that a lip portion is provided on the inner surface of the divided structural material, thereby providing a structural material for a concrete pier excellent in workability, in which assembling of reinforcing bars on the site is reduced. can do.

According to a fourth aspect of the present invention, the divided structural member according to the second aspect is assembled in a circumferential direction, a vertical reinforcing bar is inserted into adjacent connecting portions, and the connecting portions are connected to each other. This is a construction method in which concrete is filled in the structural material and integrated, reducing assembling of rebar at the site,
A construction method of a concrete pier excellent in workability can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a columnar portion of a pier showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the divided structural member.

FIG. 3 is a cross-sectional view around a connecting portion of the adjacent divided structural members.

FIG. 4 is a cross-sectional view of the assembly frame.

FIG. 5 is a cross-sectional view showing a state where the temporary structural support is set up as a divided structural material.

FIG. 6 is a plan sectional view of a steel material and a reinforcing bar of the basic slab.

FIG. 7 is a cross-sectional view showing a state in which an overhang portion is arranged on the divided structural material assembled as described above.

FIG. 8 is a cross-sectional view of the columnar portion and the overhanging portion.

FIG. 9 is a sectional view of a leg of the bridge.

FIG. 10 is a plan view of an assembled divided structural member showing a second embodiment of the present invention.

FIG. 11 is a plan view of an assembled divided structural member showing a third embodiment of the present invention.

FIG. 12 is a plan view of an assembled divided structural member showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Bridge pier 2,2A, 2B, 2C Column part 5,5A, 5B, 5C Divided structural material 15 Main reinforcement 16 Band reinforcement 17 Loop part (connection part) 41 Vertical reinforcement 43 Concrete

Claims (4)

[Claims] 1. A structural material for a concrete pier made of precast concrete, which constitutes the outer periphery of a columnar portion of a concrete pier and fills the inside with concrete to form a pier, wherein the columnar portion is divided in a circumferential direction. Forming a divided structural material substantially equal to the length of the columnar portion, and embedding a main reinforcing bar in the longitudinal direction and a band reinforcing bar in the circumferential direction in the divided structural material, and forming the band on the circumferential end side of the divided structural material. A structural material for a concrete bridge, wherein a connecting portion of a reinforcing bar is provided. 2. The structural member for a concrete bridge according to claim 1, wherein the connecting portion is formed in a loop shape. 3. The structural member for a concrete bridge according to claim 1, wherein a rib portion is provided on an inner surface of the divided structural member. 4. The divided structural member according to claim 2 is assembled in a circumferential direction, a vertical reinforcing bar is inserted into an adjacent connecting portion, and after connecting the connecting portions, concrete is filled in the assembled divided structural member. A method of constructing a concrete pier, characterized in that it is integrated with the pier.