JP3054635B2 - Construction method of attached structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Surrounding a structure integrally constructed continuously from the ground to the ground, from the water above the water surface, from the water surface to below the water surface, and further into the water bottom, and added to the surroundings for reinforcement, etc. The present invention relates to a method for constructing an attached structure, which is used for the following.

[0002]

2. Description of the Related Art As a method of forming a space under the ground or under the water surface, there are old methods such as a dug well, a recent construction of a circular structure or a PC well, and provisional deadlines around a pier installed in water such as a river. A space was formed in the space, and then a structure was built in the space. The construction methods for such structures include:
Various methods exist. However, when constructing a structure around an existing structure, it is relatively easy to construct the structure where it is exposed on land or on the water surface. In the reinforcement of seismic bridges for improved seismic resistance, there were problems such as the necessity of large-scale closing drainage work for reinforcement work underwater and below the water bottom. Excavation, earth retaining, temporary reinforcement, etc. were sometimes required even in the underground part.

As an example, FIGS. 10 to 14 show an example in which the columnar skeleton of an underwater pier is additionally struck. FIG.
As shown in FIG. 0, a sheet pile 53 and the like are double-punched into the underwater 52 around the pier 51 to prepare for a temporary deadline. FIG. 11 shows a state in which earth and sand 54 are put between sheet piles 53 that have been doubled into each other to stop water, and an inner part 56 is drained by a submersible pump 55 or the like. Form. Next, as shown in FIG. 13, the additional reinforcing member (attachment structure) 58 is made of concrete and the pier 5 is made of concrete.
1 and is integrated with the columnar portion of the pier 51. Thereafter, the sheet pile 53 at the deadline is extracted and completed as shown in FIG. As described above, it is troublesome to just drive and remove the cutoff material such as the sheet pile 53, and the ratio of the cutoff material to the entire construction cost is large and uneconomical.

[0004] In addition, even for a structure constructed on land, in a construction where a reinforcement structure or the like is added to the underground portion of the structure,
There was a problem that it was necessary to excavate a large area around the area, which required a great deal of cost.

[0005]

SUMMARY OF THE INVENTION The present invention makes it possible to relatively easily construct a structure attached to the periphery of an existing structure, and to use the structure as a reinforcing structure for the structure or to form the additional structure. It is intended to be able to be used as a means. .

[0006]

The present invention SUMMARY OF THE INVENTION may, upon construction of the additionally provided structure for reinforcing the parts of the ground or water columnar existing structures that are erected from the ground or water in the air, existing around the aerial exposed portions of the structure, manufacturing a plurality divided in the peripheral direction
Assemble the precast concrete panels made
To form a structure by introducing prestress in the direction ,
After dropping the formed structure along with the existing structure and submerging it in the ground or in water, the gap between the existing structure and the structure
Fill with expansion-hardening mortar or concrete into
This is a method for constructing an attached structure, which provides a binding force to a structure.

[0007] If the structure of the exposed portion is constructed with a precast concrete panel, it is laid down along the surface of the existing structure, and the gap between the existing structure and the structure panel is filled with expansion-hardening mortar or concrete. It is possible to give a restraining force to the structure, and it is possible to enhance the reinforcing effect. This panel is manufactured by dividing the panel into a plurality of parts in the peripheral direction and assembling it on site to introduce prestress in the circumferential direction .

[0008] Rise tonicity curable mortar, mortar with expanded cement mixed with expandable admixture in Portland cement, to compensate for the shrinkage due to hydration and drying of cement, it suppresses shrinkage cracking, restrained It is possible to increase the volume of concrete below and consolidate it, or to introduce a prestressing effect by restrained rebar. As the expansive admixture, a calcium sulfoaluminate-based or quick lime-based admixture is used. It is generally used to reduce dry cracking of concrete, to introduce prestress into concrete products such as fume pipes, and to grout.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The first example shown in FIGS. 1 to 4 is an example in which 4 m above a foundation (footing part) 2 of a pier 1 having a circular columnar skeleton having a diameter of 2.5 m and constructed underwater is covered and reinforced.
In this example, a precast concrete panel 11 divided into four parts in the circumferential direction is attached to the columnar skeleton 3, and a tension member 12 is applied between the panels 11 to introduce a circumferential prestress to form an attached structure 21. Then, as shown in FIG.
This is an example in which an expansion-hardening mortar 14 is injected between the back surface 13 of the panel 11 and the front surface 4 of the columnar skeleton 3 so as to apply a restraining force (confine effect) in the normal direction of the columnar skeleton 3 and reinforce the mortar.

First, FIG. 1A shows a work gantry 15 for assembling a precast concrete panel 11 at a portion where a columnar skeleton 3 extends above the water surface 5 from the bottom of the water, and the work gantry 15 is supported from a pier pillow beam 17 with a suspension member 16. . The panel 11 divided on the work gantry 15 is assembled, and as shown in FIG.
The cylindrical attached structure 21 is formed. This attached structure 21
Inserts the circumferential direction PC tendon 12 as shown in FIG.
I am nervous and introducing prestress. The work gantry 15 may be supported by a pile or a bracket attached to the columnar skeleton 3.

As shown in FIG. 2, the formed cylindrical auxiliary structure 21 is suspended from a pier pillow by a chain block or a wire 18 and is supported by the gantry 15 for ground separation.
1. Remove the bottom support material (a part of the hanging material 16 and the gantry 15). While being supported by a chain block or wire 18, it is gradually sunk below the water surface, and a cylindrical auxiliary structure 21 is provided on the foundation 2 (FIG. 3), and the cylindrical inner surface 13 and the columnar skeleton 3 are provided.
Is applied to the bottom of the gap with a water-stopping material or a mortar, and the swellable mortar 14 is injected. (FIG. 4) FIG.
Is a diagram in which the work gantry 15 has been removed and the installation of the attached structure 21 has been completed.

FIG. 4 is a detailed view taken in the direction of arrows CC in FIG. 3, and the columnar frame 3 and a precast concrete panel 11 divided into four around the columnar frame 3 are tightened by a PC tension member 12 to form a cylindrical auxiliary structure 21. Is formed, and a cross-sectional view integrated with an expansion-curable mortar 14 is shown. 5 to 9 show a second embodiment, in which an underground columnar frame 3 of a pier 1 extending from the ground to the ground.
In this example, a cylindrical additional structure 21 formed of a precast concrete panel provided with a cutting edge 23 at the bottom is press-fitted around the above-ground portion of the columnar skeleton 3 along with the columnar skeleton 3 with a jack. This is an example in which the cylindrical additional structure 21 and the columnar structure 3 are integrated by discharging the earth and sand between the cylindrical additional structure 21 and the columnar structure 3 and filling concrete.

FIG. 5 is a cross-sectional view of the cylindrical auxiliary structure 2 with a minimum space 22 around the columnar structure 3 at which sediment discharging operation is possible.
At the stage of assembling 1, a blade port 23 for press-fitting is attached to the lower end of the attached structure 21. As shown in FIGS. 6 and 7, the assembled tubular structure 21 takes a reaction force on a reaction force beam 31 temporarily provided below the pier pillow beam 17 and is pressed into the ground by a long-stroke hydraulic jack 32. I do.

The press-fitting of the additional structure 21 is not limited to a hydraulic jack, but may be a method using a vibratory hammer, a water jet, or the like. As shown in FIGS. 7 and 8, when the press-fitting for one lot is completed, the structure 21b of the next lot is formed thereon, and the PC steel rod 24 is connected to repeat the press-fitting. FIG. 9 shows an attached structure 2 having a predetermined length.
1, 21b, 21c are completed, and the sediment between the columnar skeleton 3 and the structures 21, 21b, 21c is discharged and filled with concrete 25, and the columnar skeleton 3, the additional structure 21,
The figure which completed integration with 21b, 21c is shown.

In the above two examples, a precast concrete panel was used as the material of the structure, but the material is not limited to this, and cast-in-place concrete, steel plate, corrugated steel plate, or the like may be used. Further, the cross-sectional shape of the target structure can be applied to a wide range such as a circle, an ellipse, and a polygon such as a triangle or more.

[0016]

According to the method of the present invention, a large-scale preparation step such as temporary closing is not required by lowering and lowering a structure formed on the ground or on the water surface with a good scaffold. In addition, the use of precast concrete panels that can be mass-produced makes it possible to minimize the amount of rebars and formwork that are to be assembled, and furthermore, to introduce prestresses and fill expansion-curable mortar with the target structures Can be given a confined effect, and the structure can be reinforced firmly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment. (B) is A in FIG.
It is sectional drawing in the -A arrow direction.

FIG. 2 is an explanatory diagram of an embodiment. (B) is B in FIG.
FIG.

FIG. 3 is an explanatory diagram of the embodiment. (B) is C in FIG.
It is sectional drawing in the -C arrow direction.

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is an explanatory diagram of another embodiment.

FIG. 6 is an explanatory diagram of another embodiment.

FIG. 7 is an explanatory diagram of another embodiment.

FIG. 8 is an explanatory diagram of another embodiment.

FIG. 9 is an explanatory diagram of another embodiment.

FIG. 10 is an explanatory diagram of a conventional example.

FIG. 11 is an explanatory diagram of a conventional example.

FIG. 12 is an explanatory diagram of a conventional example.

FIG. 13 is an explanatory diagram of a conventional example.

FIG. 14 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bridge pier 2 foundation 3 columnar skeleton 4 surface 5 water surface 11 panel 12 PC tension member 13 back surface 14 mortar 15 gantry 16 hanging material 17 pillow beam 18 wire 21 attached structure 22 interval 23 blade 24 PC steel rod 25 concrete 31 reaction force Beam 32 Jack 51 Bridge pier 52 Underwater 53 Seat pile 54 Sediment 55 Underwater pump 56 Inner part 57 Work space 58 Attached structure

Claims (1)

(57) [Claims] Upon construction of claim 1] underground or additionally provided structure <br/> granulated material from the water to reinforce the ground or parts of the water column of the existing structures that are erected in the air, the existing structures Around the exposed part in the air, a precast conc
Assemble cleat panels and introduce prestress in the circumferential direction
The structure formed, then, after lowering the formed the structure in the ground or water along the existing structures sinking, the already
Expansion-hardening mortar in the gap between the building structure and the structure
Alternatively, a method for constructing an attached structure, wherein concrete is filled to give a binding force to the structure.