JP3333788B2 - Prefabricated bridge pier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated method for constructing an RC pier using a concrete block and a reinforcing bar.

[0002]

2. Description of the Related Art As shown in FIG.
It is composed of three parts, a support part 2 and a bridge girder support part 3, and is generally constructed by casting in place. That is, after assembling the reinforcing bars and the formwork of the base portion, the concrete is cast and the foundation 1 is constructed, and then the reinforcing bars and the formwork of the supporting portions are similarly assembled, and then the concrete is cast and the struts are formed. The part 2 is constructed on the foundation 1 and finally the bridge girder support 3 is constructed on the support 2 in the same manner. For this reason, the construction period is lengthened and the cost is increased.

[0003]

Among the conventional construction methods, the factors that cause the construction period to be prolonged are mainly in the formwork work and the reinforcing work. An important point in promoting standardization is not only securing the required strength, but also how to reduce the formwork and reinforcing work.

[0004] The present invention has been standardized from the above viewpoints, and has as its object to provide a prefabricated method for RC piers that contributes to a short construction period, low cost, and labor saving.

[0005]

SUMMARY OF THE INVENTION The present invention firstly comprises:
In order to standardize the strut part, a hollow pier concrete block as a constituent unit and a reinforcing cage inserted into it are used, and multiple steel frames are used as strength members of the strut part. The steel frame is erected, the concrete block is inserted and installed from above, then the rebar cage is similarly inserted and installed, and then concrete is cast around the steel frame, and one step is performed in this manner. This is a prefabricated construction method in which a support portion is constructed by stacking up to a required level in units of one or several steps. Here, the “rebar basket” is a generic term for a cage made of a steel frame or a steel bar having a size much smaller than the steel frame, and is used for reinforcing the concrete block.

Second, a precast hollow bridge girder support block is mounted on the column constructed as described above, and reinforcing bars are arranged around the plurality of steel frames. A prefabricated construction method, wherein concrete is cast and the block is integrally joined to the column.

Next, a concrete block for a pier of a standard specification used in the prefabrication method according to the present invention is formed in a hollow body so that the plurality of steel frames penetrate therethrough, and a convex engaging portion is formed on each of upper and lower surfaces. This is provided with a concave engaging portion.

[0008]

[Function] This prefabrication method is to construct a column using a standardized concrete block for piers and a reinforcing bar, and at this time, the concrete block itself has a function of a formwork that does not need to be removed. The rebar basket only needs to be installed inside the concrete block to reinforce the concrete block, and it is not necessary to add the rebar cages by welding. The strength of the strut portion is borne by a plurality of steel frames erected on the foundation and penetrating the inside of the stacked concrete blocks and the concrete blocks integrated with the steel frames.

[0009] Since it is only necessary to insert the concrete block and the reinforcing bar from above the steel frame and stack them,
The formwork operation and the bar arrangement operation of the support portion are simplified. Furthermore, the use of precast bridge girder support blocks simplifies the formwork work of the bridge girder support.

[0010] The concrete block and the reinforced basket for the pier are used for piers of all specifications, and contribute to shortening of construction period and reduction of construction cost.

[0011]

FIG. 1 is a process diagram showing one embodiment of a prefabricated method according to the present invention. The procedure of this method is as follows.

(1) Construction of foundation The foundation 1 is constructed by assembling reinforcing bars and formwork on a support pile (not shown) as usual, and then casting concrete. After that, as shown in FIG.
Make a 1 The steel frame 11 is made of, for example, a steel pipe, and the upper and lower portions of the inside are preferably filled with a filling concrete 12 in advance. A hole 13 in which the steel frame 11 is provided on the upper surface of the foundation 1
And the surroundings are filled with concrete 14 to erect the steel frame 11. In addition, a square pipe, an H-section steel, or the like can be used for the steel frame 11 in addition to a circular pipe as shown in the figure.

(2) Construction of the pillar part The pillar part 2 is constructed by using a precast hollow bridge pier concrete block 21 and a reinforcing cage 22 as constituent units. That is, this concrete block 2
Reference numeral 1 also serves as a formwork that does not need to be removed.

The concrete block 21 is shown in FIGS.
As shown in FIG. 2, the upper and lower joint surfaces are formed in, for example, a hollow rectangular body, and a convex engaging portion 23 and a concave engaging portion 2
4 are formed. In FIG. 3, reference numeral 25 denotes a wire passage hole when a concrete block is carried in. The contour shape of the concrete block 21 is arbitrary, and may be circular or elliptical.

As shown in FIGS. 5 and 6, the reinforcing bar cage 22 is formed by combining steel frames or reinforcing bars into a cage shape having a shape conforming to the contour shape of the concrete block 21.

As described above, the concrete block 21 and the reinforcing bar 22 as constituent units are standardized and selectively provided according to specifications.

In order to construct the column 2, first, a plurality of steel frames 11 are erected on the foundation 1 as described above, and then the first concrete block 21 is inserted from above the steel frame 11, and Place on top. Next, similarly, the rebar cage 22 is inserted from above the steel frame 11 and the concrete block 21 is inserted.
(See FIGS. 1A and 2). Thereafter, concrete 20 is poured around the steel frame 11 to complete the first step. Thereafter, the concrete blocks 21 and the reinforcing bars 22 are stacked one by one by the above method. The concrete 20 may be cast one step at a time, or may be placed on one side in several steps. Reinforced basket 22 when performing in several steps
It is good to temporarily fix it so that it does not shift.

In this manner, the support 2 is extended to a predetermined height and integrated to form the support 2 (see FIG. 1B). Although the height of the reinforcing bar 22 is usually the same as the height of the concrete block 21, it is not always necessary to do so, and in some cases, the height can be double or triple. The steel frame 11 has such a height that its upper part protrudes above the column 2.

(3) Construction of Bridge Girder Support Part Finally, as shown in FIG. 1 (c), a precast hollow bridge girder support block 31 is mounted on the column 2 constructed as described above, After arranging the reinforcements 32, the concrete 30 is cast and integrated with the column 2 to support the bridge girder 3.
To build.

[0020]

The effects of the present invention are listed below. (1) Using a concrete block for piers and a reinforced basket of standard specifications, insert the concrete block and reinforced basket from above a plurality of steel frames erected on the foundation in advance, and cast concrete into it. It is possible to prefabricate the RC pier,
As a result, the work of forming the form of the support portion and the work of arranging the bars can be remarkably simplified, so that it is possible to greatly reduce the construction period and the construction cost. (2) The effect can be further enhanced by using a precast bridge girder support block. (3) By standardizing concrete blocks for bridge piers, factory production becomes possible, and it is possible to cope with the construction of bridge piers of all specifications.
Reduces transportation and other costs and contributes to labor savings.

[Brief description of the drawings]

FIG. 1 is a process diagram of a prefabricated method according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a concrete block for a pier used in the method.

FIG. 4 is a plan view of the concrete block.

FIG. 5 is a plan view of a reinforcing bar cage used in the method.

FIG. 6 is a front view of the rebar basket.

FIG. 7 is a perspective view of a conventional pier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Prop part 3 Bridge girder support part 11 Steel frame 20 Concrete 21 Concrete block for pier 22 Reinforcement cage 23, 24 Engagement part 30 Concrete 31 Bridge girder support block 32 Reinforcing bar

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-64699 (JP, A) JP-A-5-263404 (JP, A) JP-A 2-106007 (JP, U) JP-A 61- 206709 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E01D 19/02

Claims (3)

(57) [Claims] 1. A bridge pier concrete in which a plurality of steel frames are erected from a foundation to a height positioned in a hollow portion of the uppermost bridge girder support portion, and a hollow body penetrating from above the plurality of steel frames is formed. Inserting the hollow body of the block into the steel frame and installing the concrete block for the pier on the foundation;
A rebar cage is inserted from above the steel frame into the hollow body so as to surround the steel frame, and is installed. After that, concrete is poured into the hollow body. Repeating up to the uppermost part of the lower part of the part, placing the bridge girder support on the concrete block for the pier of the uppermost part, projecting the steel frame into the hollow of the bridge girder support part, A prefabricated method for a pier, comprising: arranging a reinforcing bar in a hollow body; and thereafter, casting concrete in the hollow to integrate the bridge girder support portion. 2. A bridge pier concrete in which a plurality of steel frames are erected from a foundation to a height located in the hollow of the uppermost bridge girder support portion, and a hollow body penetrating from above the plurality of steel frames is formed. Inserting the hollow body of the block into the steel frame and installing the concrete block for the pier on the foundation;
A rebar cage is inserted from above the steel frame into the hollow body so as to surround the steel frame, and is installed. The above-described process is performed in units of several stages of concrete blocks for piers, and then the hollow portions of concrete blocks for piers for several stages Concrete is poured into the body, and the above-described steps are repeated up to the uppermost step below the bridge girder support section. Protrude the steel frame, and at the same time, arrange reinforcing bars around multiple steel frames,
Thereafter, concrete is poured into the hollow to integrate the bridge girder support portion, and the bridge pier is prefabricated. 3. A bridge pier concrete in which a plurality of steel frames are erected from a foundation to a height located in the hollow of the uppermost bridge girder support portion, and a hollow body penetrating from above the plurality of steel frames is formed. Inserting the hollow body of the block into the steel frame and installing the concrete block for the pier on the foundation;
A reinforcing bar having a height of two or three steps of the concrete block for the pier is inserted into the hollow body from above the steel frame so as to surround the steel frame, and the steel cage is inserted into the hollow body. 2 or 3 steps of concrete blocks for piers are installed, and then concrete is poured into the hollow body of the concrete blocks for 2 or 3 steps of piers. Repeatedly, placing the bridge girder support on the topmost pier concrete block, projecting the steel frame into the hollow of the bridge girder support,
At the same time, rebar is laid around multiple steel frames,
A prefabricated method for a pier, wherein concrete is poured into the hollow to integrate the bridge girder support portion.