JPH03166418A - Reinforcing member for field placing concrete pile - Google Patents

Abstract

PURPOSE:To improve the operability in the field by forming a fibre bundle with multiple fibers, and stranding this fibre bundle into a grid with resinous material to form an appearance annularly, and using it as a reinforcing member for field placing concrete pile. CONSTITUTION:An appearance of a reinforcing member 10 for concrete pile is formed annularly with reinforcing member 11 formed into a grid with the fibre bundle of which base is high speed fiber. The grid reinforcing member 11 is made of the fibre bundle, and this is bound into a grid with the resinous material. Light glass fiber having high strength and carbon fiber are used as the fiber, and vynil ester resin having the excellent adhesionability is used as stranding fiber material. Next, a drilling hole is drilled in the ground G, and the reinforcing member 10 for concrete pile is built in the hole, and self- hardening hardening material is placed in the drilling hole to execute the pile. Operability in the field can be thereby improved because of the lightness.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a reinforcing wJ material for cast-in-place concrete piles, which can be used for construction of structures and cast-in-place piles for civil engineering structures.

``Conventional technology'' The cast-in-place pile method is a type of pile foundation construction method, and to be more precise, it is a method called the cast-in-place concrete pile method. This construction method mainly involves constructing reinforced concrete shafts by drilling holes in the ground and pouring concrete into them.

In this method, the ground is excavated deeply, so it is necessary to prevent the collapse of the hole wall. (Not all kasig)
, reverse construction method, BH construction method, etc., which protect only the upper part of the drilled hole, and protect the hole wall deeper than that by the hydraulic pressure of bentonite mud or fresh water.

There are many types of pile construction methods, so the use, soil quality, environment, etc.
The appropriate construction method can be selected depending on the work space, etc., ■There is little noise during construction, ■Depending on the construction method, it is possible to observe the excavated soil and confirm the supporting layer, ■The strength of the pile The length can be adjusted without waste, and long piles can be constructed by penetrating intermediate hard strata.

In any of these cast-in-place pile construction methods,
Reinforcing members for cast-in-place concrete piles, which are mainly made of reinforcing bars, are buried in concrete. This reinforcing member for cast-in-place concrete shafts is a member shown by reference numeral 1 in Figs. 13 to 15, and includes a plurality of main reinforcing bars 2 extending in the longitudinal direction of the pile, and these main reinforcing bars. 2 ・
Multiple hoop lines 3 installed in the horizontal direction of...
・ It is formed from.

When manufacturing this reinforcing member for cast-in-place concrete piles, main reinforcing bars and hoop reinforcing bars are joined in a grid pattern,
An operator wraps the reinforcing bars around the reinforcing bars using a frame 5 as shown in FIG. Then, the rebar that has been wound is
The ends are joined and the cross section is shaped into a circular shape as shown in FIG. 13(b).

``Problem to be solved by the invention'' However, the production of the above-mentioned reinforcing members for cast-in-place concrete piles itself requires manual labor, and the assembly work of reinforcing members for cast-in-place concrete piles is hard and time-consuming work. As a result, it is extremely difficult to secure young workers, and as a result, as the absolute number of skilled workers decreases year by year, their wages also tend to increase. Therefore, it is desired to save labor in the above-mentioned work at construction/civil engineering sites.

Further, the main reinforcing bars 2 and the hoop reinforcing bars 3 are mainly joined by welding, but welding cannot be performed in the case of rain.

Furthermore, since there is a large amount of welding between the main reinforcing bars 2 and the hoop reinforcing bars 3, the production requires the labor of many dogs.

Therefore, an object of the present invention is to provide a reinforcing member for cast-in-place concrete piles that is easy to manufacture and can realize a cast-in-place pile with high strength.

"Means for Solving the Problems" The reinforcing member for cast-in-place concrete piles of the present invention is used for cast-in-place piles provided extending in the depth direction of the ground, and is applied to approximately the center of the cast-in-place piles. be placed,
A fiber bundle consisting of a plurality of aligned fibers intersects each other to form a lattice shape, and each fiber of the loquat fiber bundle is bound with a resin material to form a lattice-shaped reinforcing member, which has an annular appearance. It is characterized by its formation.

"Function" The reinforcing member for cast-in-place concrete piles of the present invention uses a reinforcing member for cast-in-place concrete piles formed in a ring shape by endlessly connecting fiber bundles formed in a lattice shape. It is possible to manufacture reinforcement members for cast-in-place concrete columns.

In addition, since the reinforcing member for cast-in-place concrete piles is mainly composed of high-strength continuous fibers, sufficient bending strength is exhibited even after a self-hardening connecting material such as concrete is cast.

"Example" Hereinafter, an example of the reinforcing member for cast-in-place concrete piles of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the cast-in-place concrete pile reinforcing member 10 of this embodiment is used for a cast-in-place pile extending in the depth direction of the ground. A lattice-shaped reinforcing member 1l, which is disposed approximately at the center of the lattice-like reinforcing member 1l, is formed into a lattice-like shape by fiber bundles mainly made of high-strength continuous fibers, and is formed into an annular shape in appearance.

The lattice-shaped reinforcing member l1 is formed by fiber bundles made of a plurality of aligned fibers crossing each other to form a lattice shape, and each fiber of these fiber bundles being bound together with a resin material.

4 to 10 are diagrams for explaining the lattice-like reinforcing member 11 in more detail.

In these figures, reference numeral 11 indicates a lattice-shaped reinforcing member constituting the reinforcing member IO for cast-in-place concrete piles,
This lattice-shaped reinforcing member 11 is constructed by fiber bundles 15 made of a plurality of aligned fibers 13 crossing each other to form a lattice shape, and each fiber 13 of the fiber bundles 15 being bound together by a resin material 16. ing. Further, as shown in FIG. 6, the intersection l7 between the fiber bundles l5 has three layers: a fiber group 13a extending in one direction and a fiber group 13b extending in the other direction perpendicular to this. It has a cross-sectional shape in which more than 16 layers (in the illustrated example) are laminated. The reinforcing member l1 is formed into a rectangular lattice shape with no steps and the same thickness as a whole.

Note that the surface of this reinforcing member l1 may be formed into a rough surface by active means described below.

As the fibers l3 that form the main body of the reinforcing member 11, glass fibers, carbon fibers, etc., which are lightweight and have high strength, are suitable, but if necessary, other fibers such as rigid resin fibers, ceramic fibers, metal fibers, etc. may be used. You may also use Further, these fibers may be appropriately combined.

Further, as the resin material l6 for binding each fiber 13 of the fiber bundle 15, a resin that has good adhesion to these fibers 13 and has sufficient strength itself, such as vinyl ester resin, is suitable. However, other resin materials may be used depending on the type of fiber 13 used.

Other resin materials include unsaturated polyester resins, epoxy resins, phenol resins, and the like.

The ratio of the resin material 16 to the fibers 13 is determined based on the type and strength of the fibers 13, as well as the reinforcing member 1.
Although it is determined as appropriate in consideration of the usage pattern of 1, for example, when the fiber 13 is glass fiber and the resin material 16 is vinyl ester resin, the fiber 13 should be set at a deposition ratio of about 30 to 70%, and When the fiber 13 is, for example, the carbon fiber 13, it is preferable to consider it so that it is about 20 to 60%.

Such a structural reinforcing member l1 can be manufactured using, for example, an apparatus as shown in FIGS. 7 to 10. In these figures, the reference numeral 20 is a surface plate, the reference numeral 2l is a guide frame provided around the surface plate 20, the reference numeral 22 is a reinforcing member provided side by side on the surface plate 20, and a reinforcing member (llo') having a horizontal component and a vertical component. The bins correspond to the respective bins. Surface plate 20
The upper edge is formed into a curved surface, and the side surface is formed so as to be slightly inclined inward.

Regarding the manufacturing method, continuous fibers impregnated with resin are sequentially hooked onto the corresponding pins 22 in the vertical and horizontal directions in a so-called one-stroke manner, making sure that the fiber groups are alternately overlapped in three or more layers at the intersections. .

FIG. 9 shows an example of a method of laminating the intersection, in which four fiber groups 13a or 13b arranged in a plane are stacked as a single layer, passing through the fibers in the order of numbers indicated by arrows in the figure. Therefore, in the case of the reinforcing member 11 according to the embodiment, the intersection l7 is
Since there are 16 layers (64 layers), steps
This will be repeated several times. At this time, the continuous fibers are
Sufficient tension must be applied to maintain linearity.

Although it is of course possible to supply the continuous fibers manually, it is preferable to use a method in which the continuous fibers are automatically supplied by mechanical means operated based on a program in which the passing order is set in advance.

After completing the continuous fiber supply process in this way, use the presser plate 23 to apply pressure from the top side as shown in FIG. 10 to make the thickness uniform, and as shown in FIG. Obtain 1 liter of rectangular lattice-shaped reinforcing member. ,Otsuru. Here, if the surfaces of the presser plate 23 and the surface plate 20 are made uneven in advance,
The surface of the reinforcing member II can be formed into a rough surface with unevenness. In this way, it is possible to improve the adhesion of the reinforcing member 11 to concrete.

Next, an example of the use of a cast-in-place pile using the cast-in-place concrete reinforcement member IO of the construction will be described with reference to FIGS. ti and 12.

In Figure 11, the ground G
An excavation hole is excavated inside the excavation hole, and the reinforcing member 10 for the cast-in-place concrete pile manufactured as described above is built into the excavation hole.

Thereafter, a self-hardening material is driven into the excavated hole by means not shown to construct the pile.

Next, the ura reinforcing material using high-strength continuous 1a vertebrae used in this example will be explained with reference to the drawings.

According to the cast-in-place concrete reinforcing member 10 of this embodiment, the following excellent effects can be achieved.

Since the reinforcing member 10 for cast-in-place concrete resistance is itself lightweight, it has good on-site operability. In addition, since the reinforcing member lO for cast-in-place concrete piles can be easily manufactured,
It is possible to cope with the shortage of skilled workers, and since no work such as welding is required during production, reinforcing members IO for cast-in-place concrete piles can be produced regardless of wind and rain. The problem will be eliminated and the construction period can be shortened. Furthermore, by omitting manual work, the site can be kept in order, and from this point of view as well, the manufacturing efficiency of the reinforcing member 10 for cast-in-place concrete piles can be improved. In addition, since it is mainly composed of fibers, the quality of reinforcing members for cast-in-place concrete reinforcements can be improved by demonstrating the characteristics of the fibers themselves, such as not rusting and being highly resistant to seawater and chemicals. .

For piles using reinforcing members for cast-in-place concrete piles,
Since no heat is applied by fire, there is no need to consider the effect of heating on reinforcing members for cast-in-place concrete piles, so there is no design problem and it can be fully put into practical use.

In addition, the supplementary member for cast-in-place concrete piles of the present invention is
The present invention is not limited to the above embodiments, and other modifications are also possible.

In the above embodiment, the appearance shape of the reinforcing member for cast-in-place concrete piles was annular, but it is not limited to this, and the appearance may be rectangular or other shapes, and in this case, the same effects as in the above embodiment can be obtained. can be played.

"Effects of the Invention" The reinforcing member for cast-in-place concrete piles of the present invention is used for cast-in-place piles that extend in the depth direction of the ground, and is arranged approximately at the center of the cast-in-place piles. And,
A fiber bundle consisting of a plurality of aligned fibers crosses each other to form a lattice shape, and each fiber of these fiber bundles is bound with a resin material to form a lattice-shaped reinforcing member, which has an annular appearance. Because of this configuration, the following effects can be achieved.

Since the reinforcing member for cast-in-place concrete piles itself is lightweight, it has good on-site operability. In addition, reinforcing members for cast-in-place concrete columns can be easily produced, which can help address the shortage of skilled workers.Also, since no work such as welding is required during production, cast-in-place concrete reinforcement members can be cast on-site regardless of wind and rain. In addition to being able to manufacture reinforcing members for concrete piles, poor workability due to welding is eliminated, and the construction period can be shortened. Furthermore, by omitting manual work, the site can be kept in order, and from this point of view as well, the production efficiency of reinforcing members for cast-in-place concrete piles can be improved.

Since it is mainly composed of fibers, the fibers themselves do not rust and are highly resistant to seawater and chemicals, thereby improving the quality of reinforcing members for cast-in-place concrete piles. Can be done.

For piles using reinforcing members for cast-in-place concrete piles,
Since no heat is applied by fire, there is no need to consider the effect of heating on reinforcing members for cast-in-place concrete piles, so there is no design problem and it can be fully put into practical use.

[Brief explanation of the drawing]

1 to 12 are views showing an embodiment of the reinforcing member for cast-in-place concrete piles of the present invention, and FIG. The figure is a side view showing the state before and after assembling the reinforcing member for cast-in-place concrete piles, Fig. 4 is a perspective view of the lattice-like reinforcing member, Fig. 5 is a sectional view of the straight part of the fiber bundle, and Fig. 6 is the fiber bundle. 7 is a schematic plan view of the manufacturing equipment, FIG. 8 is a side view of the same, FIG. 9 is an explanatory diagram showing the method of laminating the intersection, and FIG. 10 is a pressurizing process. FIGS. 11 and 12 are state diagrams showing the state of use of reinforcing members for cast-in-place concrete piles, and FIGS. 13 to 15 are diagrams showing conventional examples of reinforcing members for cast-in-place concrete piles. be. l1 10...Reinforcement member for cast-in-place concrete piles, 2...Main reinforcing bars, 3...Hoop reinforcement, 1 l Lattice reinforcement member,

Claims (1)

[Claims] A reinforcing member for cast-in-place concrete piles, which is used for cast-in-place piles extending in the depth direction of the ground, and placed approximately in the center of the cast-in-place piles, comprising a plurality of aligned cast-in-place concrete piles. Fiber bundles made of fibers intersect with each other to form a lattice shape, and each fiber of these fiber bundles is bound with a resin material to form a lattice-shaped reinforcing member, which has an annular appearance. Reinforcing material for cast-in-place concrete piles.