JP2010159601A - Construction method of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a structure which can eliminate processes of constructing cast-in-place piles, placing a temporary earth retaining structure or the like so as to easily construct the structure such as a large bridge pier in a short period of time. <P>SOLUTION: A earth-retaining wall 1 is constructed in the ground by an earth-retaining method so that its cross section becomes rectangular. The bridge pier 12 for the structure is constructed on the earth-retaining wall 1 with the earth-retaining wall 1 as a foundation. The earth-retaining wall 1 is constructed by forming a column-shaped improved wall 2 in the ground while drilling a hole in the ground by a drill and discharging an improving agent from the tip of the drill, overlapping the improved walls 2 in this manner with each other to form a columnar row of the improved walls 2, and inserting an H-shaped steel 3 into the predetermined improved wall 2 when forming the improved wall 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a structure construction method, and more particularly to a structure construction method capable of easily constructing a structure such as a large pier in a short time.

  Conventionally, structures such as piers are generally constructed through the following processes.

(1) Construction process of cast-in-place piles on the ground.
(2) Temporary earth retaining placement process.
(3) The excavation process of the ground in the temporary earth retaining.
(4) Cast-in-place pile head treatment process.
(5) Footing and pier construction process.
(6) Backfill process.
(7) Temporary earth retaining removal process.

  In order to construct a structure such as a bridge pier, it was constructed through many processes as described above, and therefore, the construction period was long and a great deal of cost was required.

  Therefore, the inventors of the present application have made intensive studies to obtain a structure construction method that can easily construct a structure such as a large pier in a short time. As a result, if the foundation is constructed by the mountain fastening method, the cast-in-place pile construction process on the ground in the above step (1), the temporary earth retaining placement step in the above step (2), the cast in place in the above step (4). Since it is possible to omit the pile head treatment process and the temporary earth retaining removal process in the above step (7), it is possible to easily construct a structure such as a large pier in a short period of time. Obtained.

  The present invention has been made based on the above knowledge, and an object thereof is to easily construct a structure such as a large pier in a short time.

  The present invention is characterized by the following.

  The invention according to claim 1 constructs a retaining wall in the ground by a retaining method so that the cross section becomes a polygonal shape or a closed curved shape, constructs a structure on the retaining wall based on the retaining wall, The retaining wall is formed in such a manner that a cylindrical improvement wall body is formed in the ground by discharging the improvement liquid from the tip of the drill while digging a hole in the ground by a drill. The improved wall body is formed in a column shape by wrapping each other, and when the improved wall body is formed, the improved wall body is constructed by inserting H-shaped steel into the predetermined improved wall body. is there.

  The invention according to claim 2 is the method for constructing a structure according to claim 1, wherein the lower part of the structure is connected to the inside of the foundation via a connecting member, and the connecting portion is made of concrete. It is characterized by placing.

  The invention according to claim 3 is characterized in that, in the method for constructing a structure according to claim 1 or 2, the structure is a bridge pier.

  According to this invention, while digging a hole in the ground with a drill, the improvement liquid is discharged from the tip of the drill to form a cylindrical improved wall body in the ground, and the improved wall thus formed When the improved wall body is formed by wrapping the bodies together to form the improved wall body, a foundation is constructed by a mountain fastening method comprising inserting H-shaped steel into the predetermined improved wall body. Thus, the construction process of cast-in-place piles, the placing process of temporary earth retaining, and the like can be omitted, so that a structure such as a large pier can be easily constructed in a short time.

It is a partial abbreviation sectional view showing the pier constructed by the construction method of the structure of this invention. It is the sectional view on the Aa line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG.

  An embodiment of the structure construction method of the present invention will be described with reference to the drawings. In this case, the pier is taken as an example of the structure, but it goes without saying that a structure other than the pier may be used.

  FIG. 1 is a partially omitted sectional view showing a pier constructed by the structure construction method of the present invention, FIG. 2 is a sectional view taken along line Aa in FIG. 1, and FIG. 3 is taken along line BB in FIG. Sectional drawing and FIG. 4 are CC sectional view taken on the line of FIG.

  As shown in FIGS. 1 and 4, the construction method of the present invention is as follows. First, a retaining wall 1 is formed in the ground by a retaining method so that the cross section has a polygonal shape or a closed curved shape (in this example, a rectangular shape). Build up.

  In the mountain-clamping method, a cylindrical improvement wall body 2 is formed in the ground by discharging a modification liquid made of cement milk, bentonite or the like from the tip of the drill while digging a hole in the ground with a drill. The improved wall body 2 is wrapped with each other to form the improved wall body 2 in a column shape, and when the improved wall body 2 is formed, the H-shaped steel 3 is inserted into the predetermined improved wall body 2. (See FIG. 4). In this example, every other H-shaped steel 3 is inserted, but may be inserted into each improved wall body 2.

  The retaining wall 1 constructed by the above-described retaining method has not only high strength but also excellent water-stopping performance, and has a construction speed higher than that of a cast-in-place pile, and has less vibration and noise. Have. Therefore, if the mountain retaining wall 1 constructed by the mountain retaining method is used as the foundation of the structure, a foundation having high strength can be constructed taking advantage of the above-described advantages.

  Next, the ground in the retaining wall 1 constructed as described above is excavated. The excavation depth H (shown in FIG. 1) is the length of the lower part of the pier, which will be described later, connected to the retaining wall 1.

  Next, based on the retaining wall 1, the lower part of the H-shaped steel 4 that forms the framework of the bridge pier is fixed to the inner side of the retaining wall 1 via a support 5 made of H-shaped steel or the like. At this time, the H-shaped steel 4 is reinforced by the spiral rebar 6 or the like (see FIGS. 2 and 3).

Next, concrete 7 is placed in the lower part of the H-section steel 4 which will be the frame of the pier (shown by diagonal lines in FIG. 1).
Next, inside the H-section steel 4 which is the frame of the pier, rebars 8 and 9 are arranged on the outer periphery, the inner mold 10A forming the inner surface of the pier is assembled inside the H-section steel 4, and the pier is formed outside. The outer mold 10B that forms the outer surface is assembled. Then, concrete 11 is placed between the inner mold 10A and the outer mold 10B. The inner and outer molds 10A and 10B are indicated by phantom lines in FIGS.

  And the pier 12 can be constructed if the inner mold 10A and the outer mold 10B are removed after the concrete 11 is hardened.

According to this invention, by using the mountain retaining wall 1 constructed by the mountain retaining method as a basis, compared to the conventional construction method described above, the construction process of the cast-in-place pile on the ground, the placement process of temporary soil retaining, Since the head treatment process of cast-in-place piles and the removal process of temporary earth retaining can be omitted,
Structures such as piers can be easily constructed in a short time. Moreover, since the mountain retaining wall constructed by the mountain retaining method can be enlarged as necessary, it can also be applied to a large structure.

1: Mountain retaining wall 2: Improved wall body 3: H-shaped steel of foundation 4: H-shaped steel of structure 5: Supporting work 6: Spiral rebar 7: Concrete 8: Reinforcing bar 9: Reinforcing bar 10A: Inner mold 10B: Outer mold Frame 11: Concrete 12: Pier

Claims (3)

  A mountain retaining wall is constructed in the ground by the mountain retaining method so that the cross section becomes a polygonal shape or a closed curved shape, a structure is constructed on the mountain retaining wall based on the mountain retaining wall, and the mountain retaining wall is formed on the ground by a drill. While digging a hole, the improvement liquid is discharged from the tip of the drill to form a cylindrical improvement wall body in the ground, and the improvement wall bodies thus formed are wrapped together to form the improvement wall body. A method of constructing a structure, wherein the structure is constructed by inserting H-shaped steel into the predetermined improved wall body when forming the improved wall body.   The method for constructing a structure according to claim 1, wherein the lower part of the structure is connected to the inside of the foundation via a connection member, and concrete is placed in the connection part.   The method for constructing a structure according to claim 1, wherein the structure is a bridge pier.

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