JPH07904B2 - Precast concrete cloth foundation assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for assembling a precast concrete (hereinafter referred to as PC concrete) cloth foundation.

[Prior Art] The most common method for constructing a cloth foundation is to assemble a formwork and pour concrete on site, but there are problems in that the product accuracy is low and the quality varies greatly.

Therefore, in order to solve the above problem, after manufacturing the PC concrete cloth foundation member in which the beam member and the footing part are integrated, and placing a plurality of the PC concrete cloth foundation members on the construction floor at the site The installation method of joining to each other has become popular. However, since this one-piece PC concrete cloth foundation member is heavy, handling such as transportation was difficult.

Therefore, recently, a PC concrete beam member with only a beam portion is manufactured in a factory, and the PC concrete beam member is placed on the construction floor via a spacer so that the lower end surface of the beam member is floated from the construction floor and supported. As a result, an assembling method for forming a footing portion by casting concrete or mortar from the construction floor to the lower part of the beam member can be performed.

Here, the construction floor refers to the surface on which the PC concrete beam members are placed, and is usually the top surface of the rubble or gravel sprinkled for root cutting or the top surface of discarded concrete, but when the root cutting bottom is the construction floor (Same throughout this specification).

The following two conventional examples are known as the assembly method.

As shown in FIG. 7, a longitudinal reinforcing bar 24 extending in the longitudinal direction for reinforcing the footing part 23 is fixed to a hook-shaped protruding reinforcing bar 22 protruding downward from the beam member 21 at the installation site, and then concrete is poured. To form the footing portion 23.

As shown in FIG. 8, a projecting rebar 26 in a loop shape protruding downward from the beam member 21 and opening in the longitudinal direction of the beam member 26.
The longitudinal rebar 24 is inserted into and fixed from the same longitudinal direction,
After that, the same method for forming the footing portion 23.

[Problems to be Solved by the Invention] However, in the conventional example of the above-mentioned assembly method, since the longitudinal reinforcing bars 24 are long, they are hooked on the hook-shaped protruding reinforcing bars 22 or looped in a narrow root cutting at the site. It was extremely difficult to perform a mechanism work for inserting and fixing the projecting rebar 26 in. Further, in order to improve the strength when a lateral force is applied to the beam member 21, there may be a case where a plurality of orthogonal reinforcing bars extending in the orthogonal direction are intersected with the longitudinal reinforcing bars 24. It was very troublesome to work to fix the.

An object of the present invention is to solve the above problems and provide a new PC concrete cloth foundation assembling method capable of assembling a cloth foundation which is easy in mechanical work of reinforcing bars in the field and excellent in strength. It is in.

[Means for Solving the Problem] In order to achieve the above object, in the method for assembling a PC concrete cloth foundation of the present invention, a step of horizontally floating and holding an existing mesh-shaped reinforcing bar on the construction floor of the foundation, A precast concrete beam member is vertically held above the mesh-shaped reinforcing bar, and a loop-shaped protruding reinforcing bar protruding from the lower end surface of the beam member and opening in the orthogonal direction of the beam member intersects with the mesh-shaped reinforcing bar 9). And a step of inserting the reinforcing bars extending in the orthogonal direction of the beam member into the loop-shaped protruding reinforcing bars and fixing the mesh-shaped reinforcing bars together with the mesh-shaped reinforcing bars and protruding reinforcing bars To a lower part of the beam member, a step of forming a footing portion by casting concrete or mortar is performed.

[Operation] In the above-mentioned construction method of the PC concrete cloth foundation, since the existing mesh-shaped reinforcing bars are used, the mechanical work on the site is simplified.

In addition, it is only necessary to insert a short insertion rebar that also extends in the orthogonal direction into the loop-shaped protruding rebar that opens in the orthogonal direction of the PC concrete beam member, so that the insertion work can be performed easily even within the narrow root cutting at the installation site. It can be performed. Also,
Since the inserted reinforcing bars and the mesh-shaped reinforcing bars are fixed to each other, if a footing portion is subsequently formed, a cloth foundation having improved strength is completed.

[Example] An example of an assembling method of a PC concrete cloth foundation embodying the present invention will be described below with reference to FIGS. 1 to 6.

This cloth foundation assembly method is the first
The PC concrete beam member 2 as shown in the figure and the mesh-shaped reinforcing bar 9 for reinforcing the footing portion 3 as shown in FIG.

First, the details of the PC concrete beam member 2 will be described. Inside thereof, as shown in FIG. 4, a plurality of (four in this embodiment) main bars 4 extending in the longitudinal direction and the main bars 4 in the vertical direction. Plural lines that are fixed by crossing (nine lines in this embodiment)
And the distribution muscles 5 are embedded. Further, the beam member 2
A projecting rebar 7 is provided at the lower end of the projecting bar so as to project downward in a loop shape. The projecting rebar 7 is welded to the lower two bars of the main bar 4 so as to sandwich the force distributing bar 5 between every other. The protruding loop of the protruding reinforcing bar 7 is formed so as to open in a direction orthogonal to the longitudinal direction of the beam member 2 (hereinafter, simply referred to as an orthogonal direction). An anchor member 6 is embedded in the upper end surface of the beam member 2 with its opening exposed.

Next, the mesh-shaped reinforcing bars 9 are a plurality of longitudinal reinforcing bars 10 (five in this embodiment) extending in the longitudinal direction, and a plurality of short rectangular reinforcing bars (eight in this embodiment) orthogonal to the longitudinal reinforcing bars 10. 12
It is composed of and. This orthogonal reinforcing bar 12 is pre-welded to the longitudinal reinforcing bar 10 in a factory, and is provided with an empty portion 16 as shown in FIG.

A short insertion rebar 13 to be inserted into the protruding rebar 7 from the orthogonal direction at the construction site is fixed to the empty portion 16.

Next, the method of installing the cloth foundation will be described in the order of general steps.

First, the existing mesh-shaped reinforcing bars 9 are horizontally floated and held by a spacer or the like (not shown) on the construction floor 14 in which the root cutting bottoms 17 are sprinkled with the crushed stones 15. As described above, in this embodiment, since the mesh-shaped reinforcing bar 9 is already formed, the on-site structuring work is simplified.

The PC concrete beam member 2 is lifted and protruded.
Aligning the empty space 16 of the mesh-shaped reinforcing bar 9 with both reinforcing bars 8,
9 are crossed and the beam member 2 is held vertically by a spacer or the like not shown.

Insert the reinforcing bar 13 from the direction perpendicular to the beam member 2 to the longitudinal reinforcing bar.
It is inserted through the lower part of 10 into the loop-shaped protruding reinforcing bar 7. Therefore, compared to the conventional rebar that is inserted from the longitudinal direction, it is possible to use the rebar 13 that is shorter in length, so that the insertion work can be easily performed even within a narrow root cutting.

Subsequently, the inserted reinforcing bar 13 and the longitudinal reinforcing bar 10 are fixed by welding or wire binding. The inserted reinforcing bar 13 is fixed below the longitudinal reinforcing bar 10, and even if it is pulled upward by the projecting reinforcing bar 7, no tensile force directly acts on the weld metal or the wire, so that it can be connected very robustly.

Next, by placing concrete or mortar from the construction floor 14 to the lower part of the beam member 2 so as to embed the mesh-shaped reinforcing bar 9 and the protruding reinforcing bar 7, the footing portion 3 is formed and integrated with the beam member 2. The cloth foundation is completed.

Since the beam member 2 already has sufficient strength by precasting in the factory, once the footing portion 3 is hardened, it is possible to quickly proceed to the next step without waiting for its curing.

The present invention is not limited to the configurations of the above-described embodiments, but may be embodied by being arbitrarily modified within the scope of the gist of the invention as follows, for example.

(1) The mesh-shaped reinforcing bar 9 is not limited to a perfect rectangular grid, and may be a grid that is appropriately deformed according to the shape of the footing portion.

(2) The protruding reinforcing bar 7 is not necessarily a curved rod-shaped reinforcing bar, and may be, for example, a perforated iron plate as long as it has an opening in the direction orthogonal to the beam member 2.

[Effect of the Invention] Since the method for assembling the PC concrete cloth foundation of the present invention is configured as described above, at the time of assembly, the mechanical work of the reinforcing bar is simplified and the same work is easily performed even in narrow root cutting. And exhibits excellent strength after assembly.

[Brief description of drawings]

1 to 6 show an embodiment of a method for assembling a PC concrete cloth foundation embodying the present invention, FIG. 1 is a perspective view showing an assembling process of the cloth foundation, and FIG. 2 is a footing portion of the cloth foundation. Partial sectional view from the side showing the structure, FIG. 3 is a partial sectional view from the same front, FIG. 4 is a perspective view of a beam member of the same cloth foundation, and FIG. 5 is a perspective view of mesh-shaped rebar of the same cloth foundation. FIG. 6 is a perspective view showing a step of connecting a beam member and a mesh-shaped rebar of the same cloth foundation, FIG. 7 is a side sectional view of a conventional example, and FIG. 8 is a perspective view of another conventional example. . 2 ... PC concrete beam member, 3 ... footing part, 7
...... Protruding rebar, 9 ...... Mesh shaped rebar, 13 …… Insert rebar, 14 …… Construction floor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiro Hiroshi Tanimoto 6-27 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Sekisui House Co., Ltd. (72) Hiroyuki Murase 237, Oku, Gifu City, Gifu Prefecture (56) Reference Documents JP-A-2-300420 (JP, A) JP 59-16055 (JP, B2) JK 46-9016 (JP, Y1) JK 54-15447 (JP, Y2)

Claims (1)

[Claims] 1. A step of horizontally suspending and holding an existing mesh-shaped reinforcing bar (9) on a cloth foundation construction floor (14), and a precast concrete beam member (2) above the mesh-shaped reinforcing bar (9). A step of holding a vertical shape and intersecting the mesh-shaped reinforcing bar (9) with a loop-shaped protruding reinforcing bar (7) protruding from a lower end surface of the beam member (2) and opening in a direction orthogonal to the beam member (2). And a step of inserting an insertion reinforcing bar (13) extending in a direction orthogonal to the beam member (2) into the loop-shaped projecting reinforcing bar (7) and fixing the reinforcing bar to the mesh-shaped reinforcing bar (9). 9) and a step of forming a footing part (3) by driving concrete or mortar from the construction floor (14) to the lower part of the beam member (2) so as to bury the protruding reinforcing bar (7). Assembly method of the turbocharger strike concrete cloth foundation.