JP3388454B2 - Bridge pier construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier construction method, and more particularly to a pier construction method suitable for constructing a high pier and a large number of piers. is there. 2. Description of the Related Art Generally, when constructing a pier, first, a pier foundation is constructed, and an axial steel member and a shear reinforcing steel member are arranged above the pier foundation member. A formwork was arranged so as to surround the shear-reinforced steel material, and concrete was poured into the sections defined by the formwork. [0003] However, in the above-described construction method, since various types of reinforcing steel such as axial steel and shear-reinforced steel must be connected and assembled, a great amount of labor is required. This effort was even greater for high piers and many piers. In addition, complicated formwork (conveying, installing, moving, demolding, cleaning, dismantling, disposing, etc. of the formwork) for concrete casting is required, and a large amount of concrete is transported and poured. And curing work was required. [0004] Further, when a pier is constructed by the above-mentioned method, an extremely wide scaffold and a shoring work are required in the rebar assembling work and the formwork work. As described above, the conventional pier construction method requires a great deal of labor and cost, and the construction period cannot be prolonged. Such a problem is remarkable in a high pier and a large number of piers. there were. The present invention has been made in view of the above circumstances, and provides a method of constructing a pier that can be easily and inexpensively constructed in a short period of time even with a high pier and a large number of piers. It is intended to provide. In order to achieve the above object, a method for constructing a pier according to the first aspect of the present invention has a hollow portion provided on a pier base portion, through which an axial steel material can be inserted. Then
No shear reinforcing steel is provided horizontally inside the
That the precast block, with assembling said axial steel in plan view b-shape while being inserted into the hollow portion
Wrap the ends of the upper and lower precast blocks together
It is characterized in that it is assembled upward in a state where it is made to fall , and concrete is poured into the hollow portions of the precast blocks assembled upward. According to the method for constructing a pier according to the first aspect, the precast block is assembled upward while inserting an axial steel material into the hollow portion, and concrete is inserted into the hollow portion of the assembled precast block. The bridge pier is constructed by casting. In addition, the precast block is assembled upward while inserting the axial steel material into the hollow portion thereof, and concrete is cast into the hollow portion of the assembled precast block, thereby constructing a pier incorporating the shear reinforcing steel material. . Furthermore, since the ends of the upper and lower precast blocks are wrapped, the shear reinforcing steel material in the precast block is disposed in a state of being wrapped by the upper and lower precast blocks, and a high-strength pier is constructed. . An embodiment of the pier construction method of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a pier assembled by the construction method according to the embodiment. The pier 1 is composed of a cast-in-place portion 3 constructed by casting on the top of the pier base portion 2 and a precast portion 4 constructed in the upper portion of the cast-in-place portion 3. The precast part 4 is composed of a plurality of precast blocks 5 formed in a rectangular shape, and these precast blocks 5 are assembled in a square shape in plan view as shown in FIGS. 2 and 3. . The assembled precast blocks 5 are disposed such that their ends are wrapped up and down at corners. These precast blocks 5 are formed in advance at a factory, and as shown in FIGS. 4 and 5, a shear reinforcing steel material 6 and an assembly reinforcing bar 7 are disposed inside thereof. The interior of the precast block 5 is hollow, and an axial steel material 9 provided in the longitudinal direction of the pier 1 is inserted into the hollow hollow portion 8. The bonding surfaces of the upper and lower precast blocks 5 are coated with an adhesive mortar 14 as a bonding agent, and are bonded by this. By casting concrete K into the hollow portion 8, the upper and lower precast blocks 5 and the precast block 5 and the axial steel material 9 are integrated. In addition, the code | symbol 10 in FIG.
Hanging the precast block 5 and the axial steel material 9,
It is a crane to be assembled upward.
2 is a scaffold and a lifting device. Further, the pier 1 to be constructed is provided with a self-lifting scaffold 13 around the construction location, and is moved upward each time the construction location moves upward. Next, a pier construction method for constructing the pier 1 having the above-described structure will be described along the procedure with reference to FIGS. However, those shown in FIGS. 6 to 9 are:
The construction procedure from the state where the precast portion 4 having a predetermined height is constructed by the precast block 5 is shown. (1) First, after the pier foundation 2 is constructed, the cast-in-place 3 is constructed with cast-in-place concrete at a height of about 3 to 10 m,
An axial steel material 9 is disposed above it (see FIG. 6). (2) Next, the precast blocks 5 are sequentially assembled from below by a crane 10 (see FIG. 7), and these precast blocks 5 are bonded to each other with an adhesive mortar 14.
To join. Here, when assembling the precast blocks 5, the axial steel material 9 erected on the cast-in-place 3 is inserted into the hollow portions 8 of these precast blocks 5. (3) After assembling the precast blocks 5 having a predetermined number of steps (about two steps), concrete K is poured into the hollow portions 8 of these precast blocks 5 (see FIG. 8). (4) The operations of (2) and (3) are repeated, and the pier 1 is constructed by the precast block 5. When the precast block 5 reaches the vicinity of the upper end of the axial steel material 9, the self-lifting scaffold 13 is removed. While being moved upward (see FIG. 9), a new axial steel 9 is connected to the axial steel 9 and is erected. (5) Thereafter, the above operations (2), (3) and (4) are repeated again to construct the pier 1 having a predetermined height (see FIGS. 6 to 9). As described above, according to the method of constructing a pier of the present embodiment, the formwork operation, that is, transporting, installing, moving, demolding, cleaning, dismantling, disposing, etc. of the formwork is extremely complicated. Various operations can be eliminated, and the number of field workers can be reduced. Further, unlike the related art, it is not necessary to remove the mold from the mold and convert it, so that the concrete curing time for removing the mold is not required, and thus the construction period can be shortened. Furthermore, a huge scaffold can be dispensed with, and a support for supporting the formwork can be dispensed with, and labor for installing these scaffolds and supports can be saved. Further, since the outer surface of the pier 1 can be constituted by the precast block 5, the pier 1 having excellent durability against outside air can be obtained. In addition, a precast block 5 on which a shear reinforcing steel material 6 has been disposed in advance.
And the concrete K is poured into the hollow portion 8 of the precast block 5 thus assembled.
In addition, it is possible to construct the high-strength pier 1 in which the axial steel material 9 is incorporated, and it is possible to omit the work of arranging the shear-reinforcement steel material 6 on site, and to further reduce the labor of the construction work. . In addition, since the ends of the upper and lower precast blocks 5 are wrapped together, the shear reinforcing steel material 6 in the precast block 5 can be disposed in a state where the upper and lower precast blocks 5 are wrapped together, resulting in extremely high strength. Bridge pier 1 can be constructed. As described above, according to the pier construction method of the present invention, the following effects can be obtained. According to the method for constructing a pier according to claim 1, the precast block is assembled upward while the axial steel material is inserted into the hollow portion, and concrete is poured into the hollow portion of the assembled precast block. The pier can be easily constructed. This eliminates the need for complicated formwork operations that were required in the past, that is, various tasks such as transporting, installing, moving, demolding, cleaning, dismantling, and disposing of the formwork, thereby reducing on-site workers. can do. Further, since it is not necessary to remove the mold from the mold as in the conventional case, it is not necessary to cure the concrete for removing the mold, and thus the construction period can be shortened. Furthermore, a huge scaffold can be dispensed with,
It is also possible to eliminate the need for a shoring for supporting the formwork, and it is possible to save labor for installing the scaffolding and the shoring. Further, since the outer surface of the pier can be formed by the precast block, a pier having excellent durability against outside air can be obtained. Further , the precast block is assembled upward while inserting the axial steel material into the hollow portion thereof, and concrete is poured into the hollow portion of the assembled precast block, whereby the shear reinforcing steel material and the axial steel material are incorporated. A high-strength pier can be constructed. In addition, since the shear reinforcing steel material is disposed in the precast block in advance, the labor for arranging the shear reinforcing steel material on site can be omitted, and the labor for the construction work can be further reduced. Furthermore, since the ends of the upper and lower precast blocks are wrapped together, the shear reinforcement steel in the precast block can be arranged in a state where the upper and lower precast blocks are wrapped together, further strengthening the pier. Can be constructed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a pier in the middle of assembling for explaining a pier construction method according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a pier explaining a pier construction method according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a pier explaining a method of constructing a pier according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a part of a pier for explaining a pier construction method according to an embodiment of the present invention. FIG. 5 is a side sectional view of a part of the pier for explaining the pier construction method according to the embodiment of the present invention. FIG. 6 is a side view of the pier explaining a pier construction procedure by the pier construction method according to the embodiment of the present invention. FIG. 7 is a side view of the pier explaining a pier construction procedure by the pier construction method according to the embodiment of the present invention. FIG. 8 is a side view of the pier explaining a pier construction procedure by the pier construction method of the embodiment of the present invention. FIG. 9 is a side view of the pier explaining a pier construction procedure by the pier construction method of the embodiment of the present invention. [Description of Signs] 1 Bridge pier 2 Bridge pier base 5 Precast block 6 Shear-reinforced steel material 8 Hollow portion 9 Axial steel material K Cast-in-place concrete

Continuation of the front page (56) References JP-A-6-57710 (JP, A) JP-A-61-206709 (JP, U) JP-B-58-19805 (JP, B2) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E01D 19/02 E04H 12/12

Claims (1)

(57) [Claims 1] A hollow portion in which an axial steel material standing on a pier base portion can be inserted has a hollow portion therein, and the hollow portion extends horizontally therein.
A precast block provided with a shear-reinforcing steel material is flattened while the axial steel material is inserted through the hollow portion.
Up and down precast bro
A bridge pier construction method characterized by assembling upwards with the ends of the building wrapped together, and placing concrete into the hollow portions of the precast blocks assembled upward.