JP2004257098A - Construction method for structure with footing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a structure with a footing constructible in a short period of time and having excellent durability. <P>SOLUTION: In this construction method of the structure with the footing provided with a plate-like footing part 15 connected to a foundation structure 11, and a rising part 16 formed upward at the center of the footing part 15, the structure 10 with the footing is formed divided in half blocks 17, 17 comprising plate-like footing half bodies 19 and upward rising part half bodies 20 at the side edges of the footing half bodies, and after installing the half blocks 17 on the foundation structure 11 in the mutually abutting state of the divided side faces 20a, 20a of the rising part half bodies 20, 20, the mutually facing rising part half bodies 20, 20 are jointed to each other to integrate the half blocks 17, 17. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing a structure with a footing mainly used as a pier or the like.
[0002]
[Prior art]
Generally, as shown in FIG. 7, a structure 1 with a footing such as a pier is formed in a plate-like footing portion 3 connected to a foundation structure composed of foundation piles 2, 2, etc., and formed upward in the center of the footing portion 3. The raised portion 4 is integrally formed of concrete.
[0003]
Conventionally, such a structure with a footing is constructed by assembling a formwork on the upper surface of a substructure and casting concrete in the formwork in-situ (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-241311 (paragraph 0012, FIGS. 3 to 6)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional technology, a large amount of time is required to assemble a formwork for molding a structure with a footing or to cure concrete at a construction site. On the other hand, in recent years, it is important to improve the construction environment by shortening the construction period in consideration of noise, vibration, and the like for residents near the construction site.
[0006]
As a method of reducing the construction period and construction cost at the construction site in this way, a method of forming members constituting a structure in advance at a factory and assembling the precast concrete member at the construction site has been adopted. However, a structure with a footing, such as a bridge pier, has a problem in that if it is large, the external dimensions and weight are large, and it is difficult to load it on a transportation means such as a trailer, and it is difficult to transport.
[0007]
An object of the present invention is to provide a method of constructing a structure with a footing that can be constructed in a short time and has excellent durability in view of the state of the related art.
[0008]
[Means for Solving the Problems]
In order to solve the conventional problems as described above and to achieve the intended object, the invention according to claim 1 has a flat footing portion connected to a substructure and a center formed upward of the footing portion. In the method for constructing a structure with a footing provided with a rising portion, the structure with a footing is divided into a half block having a rising portion half upwardly directed to a side edge of a flat footing half. After that, the half block is placed on the substructure by abutting the divided side surfaces of the rising part halves against each other, and then the rising part halves facing each other are joined to join the half block. It is characterized by being integrated.
[0009]
With such a configuration, construction can be performed at a low cost in a short period, and high quality and excellent durability can be obtained.
[0010]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, a pile insertion hole penetrating in the thickness direction is provided in the footing half body, and the head of the foundation pile is projected on the upper surface of the foundation structure to insert the pile. The half block is arranged on the substructure so that the head of the foundation pile is inserted into the hole, and after joining the rising portions half facing each other, the filler is filled in the pile insertion hole. It is characterized by the following.
[0011]
With this configuration, the structure with a footing can be connected to the substructure in a stable state, and positioning can be easily performed, thereby improving construction efficiency.
[0012]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the abutting portions of the rising portions are joined by bolting.
[0013]
With such a configuration, the half blocks can be suitably joined to each other.
[0014]
According to a fourth aspect of the present invention, in addition to the configuration of the first or second aspect, both ends of the PC tensile member are pierced in a state where the PC tensile member is penetrated between the abutted halves, and the PC tensile member is tensioned. Are fixed on the surface side of the half of the rising portion.
[0015]
With this configuration, even when the shearing force acting on the structure with a footing is large, the half blocks can be suitably joined with a large tightening force.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 shows a support structure of a bridge. Reference numeral 10 denotes a structure with a footing constituting a pier, and reference numeral 11 denotes a foundation structure.
[0018]
The foundation structure 11 includes a plurality of foundation piles 12 and a foundation concrete portion 13 to which an upper end of the foundation pile 12 is connected. A pier, that is, a structure 10 with a footing is constructed on the foundation structure 11. It is supposed to.
[0019]
The foundation pile 12 is formed by cast-in-place into a bar shape of a reinforced concrete structure having a reinforcing bar cage 14 therein, and an end of the reinforcing bar cage is projected and exposed from the top of the head.
[0020]
The reinforcing bar cage 14 is provided with a number of longitudinal bars 14a in a parallel arrangement spaced apart in the circumferential direction, and lateral restraint bars 14b are arranged in an annular or helical shape outside the circular arrangement of the vertical bars. And the lateral restraint bars 14b are combined in a cage shape.
[0021]
The structure 10 with a footing that constitutes the pier includes a flat footing portion 15 connected to the substructure 11 and a rising portion 16 formed at the center of the footing portion 15 so as to face upward. 17 are joined together by joining means 18.
[0022]
As shown in FIG. 2, each half block 17 is formed into a shape obtained by dividing the structure 10 with a footing, and has a flat footing half 19 and a flat plate standing upright from a side edge of the footing half 18. The rising part half body 20 is integrally formed by precast concrete so as to have an L-shaped cross section.
[0023]
Pile insertion holes 21 and 21 penetrating in the thickness direction are formed in the footing half 19, and the head of the foundation pile 12 is inserted into the pile insertion holes 21.
[0024]
The rising portion half body 20 is formed in a flat plate shape, and has insertion holes 22, 22... Penetrating in the thickness direction.
[0025]
As shown in FIG. 3, the joining means 18 passes the bolts 23 through the insertion holes 22, 22 which are communicated by abutting the half-blocks 17, 17, and screw the nut 24 into the other end to tighten. Thereby, the rising part halves 20, 20 are joined, that is, the half blocks 17, 17 are joined.
[0026]
As shown in FIG. 4, the joining means 18 is provided with a fixing plate 25 on the surface of the rising portion half 20, and a tensile member 26 made of PC steel or the like is communicated by abutting the half blocks 17, 17. It is also possible to insert the fixing holes 25 into the fixing holes 25 with the use of wedges 27, 27 and the like.
[0027]
Further, it is preferable that the half blocks 17 have the same shape so that they can be formed by the same mold.
[0028]
Next, a method of constructing the structure 10 with a footing using the above-described half blocks 17 will be described.
[0029]
First, as shown in FIG. 5A, the ground 30 is turned downward, and the ground is excavated until the ground reaches a predetermined depth, that is, a depth reaching the support layer, thereby forming the holes 31 for casting in place. Form.
[0030]
Next, as shown in FIG. 5 (b), the reinforcing rod cage 14 is suspended in the cast-in-place hole 31, and underwater concrete is cast in the cast-in-place hole 31 by cast-in-place to form the foundation pile 12. I do.
[0031]
At this time, the end of the reinforcing rod cage 14 projects from the top of the foundation pile 12.
[0032]
Then, as shown in FIG. 5C, the foundation concrete 13 is cast so that the head of the foundation pile 12 projects from the surface, and the foundation structure 11 is formed.
[0033]
Next, as shown in FIG. 6 (d), the half blocks 17, 17 are aligned and suspended so that the head of the foundation pile 12 is inserted into the pile insertion hole 21, and the half blocks 17 The 17 divided side surfaces 20a, 20a are abutted against each other.
[0034]
Then, as shown in FIG. 6 (e), the bolts 23 are passed through the communicating through holes 22, 22 by being abutted with each other, and the both rising portion halves 20, 20, ie, the both half block 17 are tightened by bolting. , 17 are joined.
[0035]
Next, as shown in FIG. 6F, a filler 32 such as concrete or mortar is poured into the pile insertion hole 21 to fill the pile insertion hole 21, and the footing portion 15 and the foundation piles 12, 12 are filled. And are rigidly connected.
[0036]
At this time, if the end of the reinforcing rod cage 14 is protruded from the top of the foundation pile 12, the connection strength is improved.
[0037]
Thus, the structure 10 with a footing is constructed.
[0038]
In the above-described embodiment, a structure with a footing used for a bridge pier has been described. However, the present invention can also be applied to a structure with a footing that constitutes a foundation structure of a building.
[0039]
Further, in the above-described embodiment, the description has been given of the case using the bolt and the one using the PC tensile material as the joining means. However, the divided side surfaces may be joined via an adhesive or the like, and the adhesive and the bolt or the bolt may be used. You may make it use together with a PC tensile material.
[0040]
【The invention's effect】
As described above, the method of constructing a structure with a footing according to the present invention comprises dividing the structure with a footing into a half block having an upwardly rising portion half at a side edge of the footing half. After setting the half blocks on the substructure, with the divided side surfaces of the rising part halves facing each other, the half blocks are integrated by joining the rising part halves facing each other. By doing so, it is possible to carry out construction at a low cost in a short period of time, and to make the concrete high in strength, high quality and excellent in durability.
[0041]
In addition, by improving the durability, the cross-sectional area of a structure such as a pier can be reduced, and material costs can be reduced.
[0042]
In particular, it is advantageous in places where work conditions (construction conditions) are poor, such as in rivers, near houses, and construction of bypass roads, and places where shortening of the construction period is required.
[0043]
After placing the half-block on the substructure so that the head of the foundation pile is inserted into the pile insertion hole, and joining the rising portions facing each other, concrete is filled in the pile insertion hole. By doing so, the structure with the footing can be connected to the substructure in a stable state, and the positioning is easy and the construction efficiency is improved.
[0044]
Even if the shearing force acting on the structure with a footing is large, the half-blocks are joined by bolting or joining using a PC tensile member between the butted rising portions. It can be suitably joined.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a pier.
FIG. 2 is a perspective view showing a half block in FIG. 1;
FIG. 3 is a partially enlarged sectional view showing a joining means in FIG. 1;
FIG. 4 is a partially enlarged cross-sectional view showing another joining means according to the first embodiment.
FIGS. 5A to 5C are cross-sectional views showing a substructure building process.
FIGS. 6 (d) to 6 (f) are cross-sectional views showing steps of constructing a structure with a footing.
FIG. 7 is a side view showing an example of a conventional structure with a footing.
[Explanation of symbols]
10 Bridge pier (structure with footing)
DESCRIPTION OF SYMBOLS 11 Foundation structure 12 Foundation pile 13 Foundation concrete part 14 Reinforcing bar 14a Vertical streak 14b Lateral restraint bar 15 Footing part 16 Standing part 17 Half block 18 Joining means 19 Footing half 20 Standing part half 21 Pile insertion hole 22 Insertion hole 23 Bolt 24 Nut 25 Fixing plate 26 Tensile material 27 Wedge 30 Ground 31 Cast-in hole 32 Filler

Claims (4)

In a method of constructing a structure with a footing having a flat footing portion connected to a foundation structure, and a rising portion formed upward in the center of the footing portion,
The structure with a footing is divided into a half block having an upwardly raised portion at a side edge of a flat footing half, and the half block is formed on a substructure. A method of constructing a structure with a footing, characterized in that the divided side faces of the raised portion halves are placed in abutment with each other, and then the halved blocks are integrated by joining the opposing raised portion halves together. The footing half is provided with a pile insertion hole penetrating in the thickness direction, and the head of the foundation pile is projected from the upper surface of the substructure, so that the head of the foundation pile is inserted into the pile insertion hole. The method for constructing a structure with a footing according to claim 1, wherein the blocks are arranged on the substructure, and the standing halves facing each other are joined to each other, and then a filler is filled in the pile insertion hole. The method for constructing a structure with a footing according to claim 1, wherein the butted rising portion halves are joined by bolting. 2. The PC tension member penetrates between the butted rising portion halves, and both ends of the PC stretching material are fixed on the surface side of the rising portion half in a state where the PC tension material is tensioned. The construction method of the structure with a footing described in the above.

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