JP2973774B2 - Pier construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier construction method applied to, for example, a high pier.

[0002]

2. Description of the Related Art Conventionally, in order to construct a pier, a method of combining a main reinforcing bar generally arranged on a foundation with a horizontal reinforcing bar, arranging a formwork on the outer periphery thereof, and placing concrete in the formwork is known. Has been taken.

[0003]

However, this type of construction method is suitable for a pier having a relatively low height, but when applied to construction of a high pier, a large number of piers are required to secure the strength. The main bars, lateral bars, haunch bars at the corners, or assembling bars are congested, and when arranging, especially when constructing high piers, the load increases, so many main bars are arranged in rows. At that time, the assembling work of the horizontal reinforcing bars is becoming more difficult, and the number of man-hours for assembling and dismantling formwork materials and separators, disassembling and removing work scaffolds, etc. becomes enormous, and a large number of skilled workers Therefore, it is disadvantageous in terms of short-term rapid construction, and the construction cost is extremely high. Formwork assembly
In order to facilitate disassembly, a buried form such as a PCa form may be used, but the trouble such as mounting a form assembling separator is not eliminated.

The present invention has been made to solve the above problems, and has as its object to assemble, disassemble, and remove a formwork and to assemble a pier suitable for rapid construction, automation, and labor saving without the need for reinforcing bars. It provides a method.

[0005]

[SUMMARY OF] To achieve the above object, the present invention is a horizontal plane between only the mold frame elements a plurality of precast concrete formwork elements of a single shape forming a hollow polygonal section The form block is assembled by erected on the foundation in a state of contact with the direction, and concrete is poured into the form block to make the horizontal direction.
Horizontally adjacent through an opening formed in the surface
Forming elements are integrated by cast concrete
That after building the lower precursor comprising, working with, the horizontal and Da設concrete to the mold block assembling the upper to the new mold the new mold block shirttail elements of the lower skeleton New type adjacent in direction
A method for constructing a pier, wherein the work of integrating frame elements with cast concrete is alternately repeated until the required height is reached.

When concrete is poured into the formwork block, a reinforcing steel cage integrated with the concrete is hollowly protruded from each formwork element in the hollow portion of each formwork element. Can be inserted. In addition, when assembling the form elements into a form block, it is preferable that a connecting steel material for connecting the form elements be arranged across a plurality of form elements.

[0007]

According to the above construction method, a formwork element is formed in a factory in advance, carried into a site, and the formwork element is erected on a foundation by a tower crane or the like at the site to form a formwork block. After assembling and casting concrete inside it to construct the lower frame,
The work of assembling a formwork block by adding a new formwork element above the lower frame by the tower crane or the like and the work of placing concrete therein are alternately repeated so that a pier having a required height can be easily and easily formed. Can be built quickly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a conceptual diagram of a construction site where the construction method of the present invention is applied to a construction method of a high pier. In the present invention, in order to construct a high pier, first, on a foundation 1 constructed on a ground portion. A plurality of precast concrete formwork elements 2 which are manufactured in a factory in advance and have a hollow hexagonal cross section are erected, and a honeycomb formwork block 4 is assembled in a state where the surfaces of the formwork elements 2 are in contact with each other. . In the formwork block 4, the formwork elements 2 are assembled in, for example, six rows and three rows so as to be arranged along the cross-sectional shape of the pier. A tower crane 5 is used to assemble the form block 4. Next, the concrete filling C is cast inside the form block 4 to construct the lower frame 6a integrated with the foundation 1.

A self-elevating scaffold 7 is used as a work scaffold for assembling the form block 4 and placing concrete, and the scaffold 7 is connected to the ground by an elevator 8.

Next, a new form element 2 is lifted up and added to the upper portion of the lower frame 6a already constructed to assemble the form block 4, and concrete C is poured into the form block 4. By alternately repeating the work of adding the form elements 2 and the work of placing the concrete C, the construction from the intermediate structure 6b occupying most of the structure to the upper structure 6c where the bridge girder 9 is installed is constructed. As shown in FIG. 2, a frame 6 having a required height is completed.
The upper and lower mold blocks 4 can be temporarily fixed by mechanical connection means or positioned by fitting unevenness. In this case, the liquid-tightness can be improved by interposing an epoxy resin or the like on the joint surface. Needless to say, it is better to secure them.

When the construction of the frame 6 is completed and the bridge girder 9 is bridged, the work scaffold 7 is suspended on the ground by the tower crane 5 while being dismantled, and the elevators 8 are sequentially dismantled from the upper side. The crane 5 is suspended and finally dismantled and removed from the top.

As shown in FIG. 3 (a), the form element 2 manufactured at the factory is provided with two or all of the six form elements adjacent to each other. For example, openings 2a are formed in three places, that is, upper, middle, and lower. A large number of reinforcing bars 2b are arranged vertically and horizontally inside the concrete forming the formwork element 2. The formwork block 4 assembles the formwork elements 2 in a state where the respective surfaces are in contact with each other so that the respective openings 2a face each other, so that a space through which the concrete can flow through each of the openings 2a is formed therein (FIG. 4).

As shown in FIG. 3B, before the concrete C is cast, a cylindrical reinforcing cage 3 is projected into the hollow portion of each form element 2 above the form element 2. As described above, the form blocks are constructed using the above-described tower crane and arranged so as to intersect the joints of the upper and lower form elements 2, thereby integrating the form blocks 4 to be constructed in the vertical direction.

[0015] As shown in FIG.
A plurality of form elements 2 penetrate the cross section in the length direction.
PC steel 10a, 1 as a connecting steel straddling the
0a and a pair of PC steel materials 10b, 10b intersecting therewith
Is installed. Here, the PC steel materials 10a, 10a are disposed so as to penetrate the upper and lower mold element rows in the left-right direction in FIG. 5, and one of the PC steel materials 10b, 10b is located at the upper left in FIG. After extending downward from the element in the lower right state, it extends to the right in the lower form element row, and further extends upward to the right to reach the form element located in the upper right, and the other is Conversely, it is arranged so as to extend from the formwork element located at the lower left to the formwork element located at the lower right. Both ends of the steel materials 10a and 10b are fixed to the outer portion of the form block 4, and the form block 4 is integrated.

Further, instead of the PC steel materials 10a and 10b,
As shown in FIG. 6, two section steels 11 a extending in the longitudinal direction of the form block 4 and straddling the six form elements 2,
The form block 4 can also be integrated by using three sets of section steels 11b crossing the X form and straddling the three form elements 2.

In any case, the liquid-tightness at the time of placing the concrete C can be maintained by interposing a sealing material or the like (not shown) between the respective surfaces of the form elements 2 at the time of assembling. .

As shown in FIG. 4 (a), the inside of all the form elements 2 constituting the form block 4 of the lower frame 6a are all circulated through the openings 2a, and the concrete is entirely filled in the hollow parts. C is cast and integrated with the foundation 1. A space portion 12 having a hexagonal cross section is formed on both sides in the longitudinal direction of the form element 2 disposed at the center of the intermediate body 6b shown in FIG. 4B. As shown, it is formed continuously with the upper frame 6c.

The shape of the form block 4 can be variously designed in accordance with the combination of the form elements 2 and the sectional shape of the corresponding pier. Further, in the above embodiment, the case where the form block 4 is assembled using the form elements 2 having a hexagonal cross section has been described. However, if the cross-sectional strength can be sufficiently secured, the mold of another polygonal cross section such as a quadrangle can be used. It is also possible to use frame elements.

[0020]

As described in detail in the above embodiment, in the method for constructing a pier according to the present invention, if form elements are manufactured in advance in a factory, they can be connected on site. By alternately repeating the work of assembling the formwork block and the work of placing concrete inside it, assembling and dismantling and removing the conventional formwork materials, assembling and dismantling of the work scaffolding, etc. Not
A pier of the required height can be easily and rapidly constructed,
Labor saving and rationalization of work can be achieved.

When concrete is poured into the formwork block, if the reinforcing bar cage is inserted so as to protrude upward from each formwork element, the reinforcing bars provided on the upper and lower formwork blocks are individually connected. Without this, the upper and lower mold blocks can be integrated in the vertical direction by a simple method.

Further, when the linking steel material for connecting the form elements is arranged at the time of assembling the form blocks, the form elements can be integrated.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an overall concept showing a construction procedure in a case where a pier construction method according to the present invention is applied to a high pier, wherein (a) is a front sectional view and (b) is a side sectional view. is there.

FIG. 2 shows a completed view of the pier, and FIG.
(B) is a side sectional view.

3A and 3B are detailed views of the formwork element, wherein FIG. 3A is a plan view and a side view, and FIG. 3B is a plan view and a side view of a reinforcing steel cage to be built.

FIGS. 4 (a), (b) and (c) are each those of FIG. 2 (a)
3 is a cross-sectional view taken along line AA, line BB, and line CC of FIG.

FIG. 5 is a cross-sectional view showing an example of integration of a form block with a PC steel material.

FIG. 6 is a cross-sectional view showing an example of integration of a form block by a reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Formwork element 2a Opening 4 Formwork block 6 Frame 6a Lower frame C Concrete

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-264414 (JP, A) JP-A-61-206709 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 19/02 E01D 21/00

Claims (3)

(57) [Claims] 1. A formwork comprising a plurality of precast concrete formwork elements of a single shape having a hollow polygonal cross section standing on a foundation with the surfaces of the formwork elements in horizontal contact with each other. Assemble the block and cast concrete into this formwork block to
Adjacent to the horizontal direction through an opening formed in the contact surface
Form elements are integrated by casting concrete
After building the lower precursor comprising Te, and the work of assembling the new mold block replenishing the new mold element above the lower skeleton, the horizontal direction by Da設concrete to the mold block New formwork adjacent to
A pier construction method characterized by alternately repeating the operation of integrating elements with cast concrete until the required height is reached. 2. When concrete is poured into the form block, a reinforcing steel cage integrated with the concrete is protruded upward from each form element into a hollow portion of each form element. The pier construction method according to claim 1, wherein the pier is inserted so as to be inserted. 3. The assembling method according to claim 1, wherein, when assembling the formwork elements into a formwork block, a linking steel material for connecting the formwork elements is arranged across a plurality of formwork elements. 2. Construction method of the pier described in 2.