JP2001220817A - Method of installing precast concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately install suspended precast concrete members at fixed positions when a structure is constructed by successively piling up a plurality of the precast concrete members to upper sections. SOLUTION: Guide members 31 are mounted at a plurality of positions along the upper edges of side faces in the previously installed lower-side precast concrete member 21a. The guide members are set up rotatably by bolts 35 while upper sections can be brought to an open state. The upper-side precast concrete member 21b is supported at an opening in the upper section of the suspended and previously installed lower-side precast concrete member, and the guide members 31 are rotated in the direction that the opened upper sections are closed and fixed temporarily. The upper-side precast concrete member is lowered on the lower-side precast concrete member along the guide members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a precast concrete member in a case where a precast concrete member is sequentially stacked upward to construct a structure. To a method that can be installed in

[0002]

2. Description of the Related Art In constructing a columnar structure made of concrete such as a bridge pier, there is a strong demand for ensuring the safety of work at heights and at the same time rationalizing labor saving and shortening the construction period. As one of the methods proposed in response to such a request, there is a method using a precast concrete member manufactured in a factory or the like. This is to produce a precast concrete member in a good place such as a factory and assemble it sequentially at the construction site to build a structure, other than forming the main part of the structure with only the precast concrete member, There is a method in which a precast concrete member is used as a mold, and concrete is poured on site in a range surrounded by the precast concrete member.

[0003] In such a method, precast concrete members manufactured in factories and the like can be assembled on site in a short period of time, and work such as formwork, assembling of rebar, placing of concrete, curing, and the like is greatly performed. And the construction period can be shortened. In addition, since the amount of work on site is reduced, work at heights when constructing a columnar structure is reduced, and safety is improved.

[0004]

As described above, in order to construct a columnar structure such as a bridge pier using a precast concrete member, the precast concrete member is lifted by a crane or the like, and is mounted on a foundation or other already installed. It must be stacked and installed on precast concrete members in precisely aligned positions. However, the lifted precast concrete member is liable to swing, and it is not easy to accurately install it at a predetermined position.

On the other hand, there is a method in which a convex portion or a concave portion having an inclined surface is provided on both of the precast concrete members to be joined, and these are fitted to each other to be installed at a predetermined position. However, in order to provide the convex and concave portions in the precast concrete member, high precision is required in the production of the precast concrete member,
A great deal of labor and expense is required to form the tightly fitting projections and depressions.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for accurately mounting a precast concrete member lifted using a simple member at a predetermined position. is there.

[0007]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is a method of sequentially stacking a plurality of precast concrete members upward and installing them at a predetermined position, and the method is already installed. The upper or lower precast at a plurality of locations along the upper edge of the side of the lower precast concrete member or at a plurality of locations along the lower edge of the side of the upper precast concrete member mounted on the lower precast concrete member. A guide member for constraining the position of the member so that the tip expands outward from the side surface of the concrete member and projects below the lower edge of the upper precast concrete member or above the upper edge of the lower precast concrete member. Attach and lift the upper precast concrete member The guide member is pivoted to a position parallel to the side surface of the precast concrete member, and the tip is connected to the other precast concrete member to be joined. Provided is a method of installing a precast concrete member in which the upper precast concrete member is lowered on the lower precast concrete member along the guide member and temporarily fixed to face or contact with each other.

The guide member may be attached after the upper precast concrete member is supported above the lower precast concrete member with a gap therebetween, or may be attached in a different manner as described in claim 2. Alternatively, the upper precast concrete member may be changed to the above-mentioned mode after being suspended and supported on the lower precast concrete member. In addition, the gap between the upper precast concrete member and the lower precast concrete member when suspended and supported is such that the upper precast concrete member does not come into contact with each other even if the upper precast concrete member is slightly shaken, and the guide member can face both the precast concrete members. And Therefore, if a guide member having a large size is used, the gap can be increased.
m or less.

In the above method for installing a precast concrete member, when the upper precast concrete member is lifted and supported with a gap above the lower precast concrete member, the precast concrete member is likely to swing back and forth and right and left. By operating the guide member attached to one of the precast concrete members and temporarily fixing the guide member so as to face or contact the other precast concrete member, the shaking can be suppressed. Then, by lowering the upper precast concrete member along the guide member, it can be installed at a predetermined position on the lower precast concrete member.

Further, since the guide member guides the upper precast concrete member in a state where the upper precast concrete member is supported on the lower precast concrete member with a small gap, the size of the member is small. In addition, the force by which the guide member restrains the upper precast concrete member is small. Therefore, the guide member may be simple,
The operation of attaching and detaching and rotating becomes easy.

According to a second aspect of the present invention, in the method for installing a precast concrete member according to the first aspect, the guide member is rotatable in a plane parallel to a side surface to which the guide member is attached. The guide member attached to the upper precast concrete member is entirely above the lower edge of the upper precast concrete member, and the guide member attached to the lower precast concrete member is entirely of the lower precast concrete member. Below the upper edge, set so as to be located respectively, after hanging and supporting the upper precast concrete member on the lower precast concrete member, rotate the guide member in a plane parallel to the side surface, Facing or contacting the other precast concrete member joining the tip It is assumed that the cause.

In this method, the upper precast concrete member is moved to a position above the lower precast concrete member in a state where the guide member attached to the upper or lower precast concrete member does not protrude from the joint surface of the precast concrete member. Be moved. At this time, the upper precast concrete member is suspended and supported to be easily shaken, but since the guide member does not protrude from the joint surface, the upper precast concrete member comes into contact with the other precast concrete member to hinder movement, or the precast concrete member or the guide member Is avoided. Then, after the upper precast concrete member is supported upward to the extent that a gap is formed between the upper precast concrete member and the lower precast concrete member, the guide member is rotated to restrain the swing of the upper precast concrete member, and along the guide member. The upper precast concrete member can be lowered.

According to a third aspect of the present invention, in the method for installing a precast concrete member according to the first aspect, the guide member is configured to install the upper precast concrete member on a lower precast concrete member and then to move the upper precast concrete member. The concrete member and the lower precast concrete member are both fastened and fixed by bolts, and thereafter, a process of stacking another precast concrete member on the upper precast concrete member is started.

According to this method, the upper precast concrete member and the lower precast concrete member can be easily connected to each other by using the guide member, and can be restrained so that relative displacement does not occur. Therefore, in the process after the upper precast concrete member is installed, it is possible to prevent a situation where the installation position is shifted even if an external force acts on the upper precast concrete member. In particular, when a precast concrete member is used as a formwork, the displacement of the precast concrete member is restricted by the guide member even if the internal pressure of the concrete cast inside acts unevenly.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of a structure constructed using the method for installing a precast concrete member according to the present invention. This structure 1 is a pier supporting a bridge girder 2 of prestressed concrete, and a footing 11 formed on the ground.
And a skeleton portion 12 raised thereon, and a head portion 13 formed on the skeleton portion. The footing 11 and the head 13 of this pier are made of cast-in-place concrete, but the skeleton 12 is formed by stacking form blocks formed of precast concrete and casting cast-in-place concrete inside the block. Is formed.

As shown in FIG. 2, the form block 21 is a member in which the outer surface portion of the frame 12 is formed in a box shape without a bottom. Reinforcing bars are embedded. Further, an intermediate restraining bar 22 for restraining the main reinforcing bar near the side surface is disposed on the pier, and the intermediate restraining bar 22 is also integrated with the formwork block 21 so that the precast concrete on the outer surface portion is used. It is arranged to protrude inward. The intermediate restraining bars 22 are arranged to maintain the shear strength in the event of an earthquake and to restrain the main reinforcing bar from bulging outward when a large bending moment repeatedly acts.

Construction of a pier using such a formwork block 21 is performed as follows. After the footing 11 of the pier is formed, the main reinforcing bars 24 of the frame 12 are arranged, and the formwork block 2 manufactured at the factory as shown in FIG.
1 is lifted by a crane 23 and installed so as to surround the outside of the main reinforcing bar 24 as shown in FIG. Then, concrete is cast inside the form block 21, the main reinforcing bars 24 are embedded, and the form is integrated with the form block 21. Further, the form blocks 21 are piled up, and the casting of concrete into the form blocks 21 is repeated, so that the frame portions 12 of the piers are sequentially raised upward.

The step of installing the form block 21 so as to be stacked on another form block already installed and having concrete poured therein is carried out as follows. This step is one embodiment of the present invention.

As shown in FIG. 5A, the form block 2
1 has four side surfaces, and a first side surface 21d and a third side surface 21e parallel thereto have a guide member 3
1a, the second side face 21f and the fourth side face
A guide member 31b is attached to the lower surface of the surface 21g. These guide members 31 are fastened so as not to protrude above the upper surface or below the lower surface of the precast concrete member 21.

As shown in FIG. 6, the guide member 31 is made of an L-shaped steel material and has a length of 350 mm to 6 mm.
Approximately 00 mm, screw holes 32 and 33 are provided near both ends. Then, as shown in FIG.
A bolt 35 is screwed into an anchor 34 embedded in the concrete 1 and attached by the bolt 35.

The form block 21b as described above is lifted by a crane and slowly lowered above the lower form block 21a which has already been installed, as shown in FIG. 8 (b).
As shown in the figure, the distance between the upper surface of the lower mold block 21a and the lower surface of the upper mold block 21b is about 5 cm to 10 cm.
cm. And the guide member 3
1 is rotated along the mounting side surface so as to face both the upper and lower formwork blocks 21a and 21b. That is, the guide member 31a attached to the lower mold block 21a
Is rotated to rotate the upper part of the upper form block 2
1b so as to face or contact the side surface of the upper mold block 2
The lower part of the guide member 31b attached to 1b faces or contacts the side surface of the lower mold block 21a.

At this time, the guide member 31 is loosely attached by bolts 35 as shown in FIG. 7, and is also rotatable with respect to the side surface. For this reason, even if the positions of the upper mold block 21b and the lower mold block 21a are slightly displaced in the horizontal direction, the guide member 31 is rotated along the side surface, as shown in FIG. 8B. In addition, both mold blocks can be opposed.

When the guide member 31 faces the upper and lower mold blocks 21a and 21b as described above, the attached bolts 35 are tightened, and the guide member 31 is rotated with respect to the mounting side surface, and as shown in FIG. As shown in ()), it abuts on the other form block and restricts its position. By slowly lowering the upper mold block 21b along the guide member 31, the upper mold block 21b is accurately installed on the lower mold block 21a.

An epoxy resin layer having fluidity as an adhesive is formed on the upper surface of the lower mold block 21a, and this epoxy resin adheres to both mold blocks 21a and 21b. Joined.

As described above, in the embodiment, the precast concrete member is used as the formwork. However, even when the main part of the structure is constituted only by the precast concrete member, the installation method according to the present invention is used. Can be applied.

[0026]

As described above, in the method for installing a precast concrete member according to the present invention, the upper precast concrete member is placed on the lower precast concrete member along the simple guide member attached to the precast concrete member. It can be installed at an accurate position, improving work efficiency and reducing construction costs.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a concrete structure constructed by applying a method for installing a precast concrete member according to the present invention.

FIG. 2 is a schematic perspective view of a form block (precast concrete member) used for constructing the concrete structure (pier) shown in FIG.

FIG. 3 is a schematic view showing a manner in which the form block shown in FIG. 2 is suspended and stacked.

FIG. 4 is a schematic perspective view showing a procedure for constructing the pier shown in FIG. 1;

FIG. 5 is a schematic view showing a method of lifting the form block shown in FIG. 2 and installing the form block on another form block already installed.

6A and 6B are a side view and a front view of a guide member used in the method shown in FIG.

FIG. 7 is a schematic sectional view showing a state where the guide member shown in FIG. 6 is attached to a form block.

FIG. 8 is a schematic diagram showing the function of a guide member attached to the form block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete structure (pier) 2 Prestressed concrete bridge girder 11 Footing 12 Body part 13 Head 21 Formwork block 22 Intermediate restraint bar 23 Crane 24 Main rebar 31 Guide member 32, 33 Screw hole 34 Anchor 35 Bolt

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Makoto Ono 13-13 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Takehiko Kitagawa 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Haruhiko Amari 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Takashi Matsui 1-3-16 Komagata, Taito-ku, Tokyo Sumitomo Real Estate Komagata Building Sumitomo Concrete Industry F-term in stock company (reference) 2D059 AA03 DD16 GG55

Claims (3)

[Claims] 1. A method of sequentially stacking a plurality of precast concrete members upward and installing them at a predetermined position, wherein the plurality of precast concrete members are installed at a plurality of positions along an upper edge of a side surface of a lower precast concrete member already installed or the lower precast concrete member. At a plurality of positions along the lower edge of the side surface of the upper precast concrete member installed on the concrete member, the tip expands outward from the side surface of the upper or lower precast concrete member, and the upper precast concrete member has A guide member for restraining the position of the lower precast concrete member is attached so as to project below the lower edge or above the upper edge of the lower precast concrete member. Leave a gap upward Supporting the guide member, rotating the guide member to a position parallel to the side surface of the precast concrete member, and temporarily fixing the distal end portion to face or contact the other precast concrete member to be joined; And lowering the upper precast concrete member onto the lower precast concrete member. 2. The guide member attached to the upper precast concrete member is rotatable in a plane parallel to the side surface to which the guide member is attached. The guide member attached to the lower precast concrete member above the lower edge of the member is set so that the entire guide member is located below the upper edge of the lower precast concrete member. After suspending and supporting the member on the lower precast concrete member, the guide member is rotated in a plane parallel to the side surface, and is opposed to or abuts on the other precast concrete member joining the tip end. The method for installing a precast concrete member according to claim 1. 3. After the upper precast concrete member is installed on the lower precast concrete member, the guide member is fixed to both the upper precast concrete member and the lower precast concrete member by bolts. The method of claim 1, further comprising: stacking another precast concrete member on the upper precast concrete member.