JP3169694U - Cement-based hardened product with fiber grid belt - Google Patents

Abstract

An object of the present invention is to provide a cement-based hardener product excellent in workability by increasing the connection strength between a retaining block and a fiber grid belt. A cement-based cured material product including a clay retaining block (1) having a plurality of reinforcing portions (3) and a fiber grid belt (5), wherein the fibers wound around a part of the reinforcing portion. A concave portion 4 capable of accommodating a manufactured grid belt was formed, and one end of the fiber grid belt covered with a resin coating was embedded and fixed in the concave portion of the reinforcing portion. [Selection] Figure 1

Description

  The present invention relates to a cement-based hardener product in which a fiber grid belt is embedded and connected to the back of a retaining block that supports earth pressure such as embankment.

  There are methods to pile up concrete blocks on the front of the embankment and cover them with cast-in-place concrete structures in order to support the sediment load on the embankment and prevent the slope from collapsing. These concrete blocks and concrete structures are prevented from falling by being connected to anchors which are buried and fixed in the embankment.

  As an anchor embedded in the embankment, for example, there is a so-called tail arme. The tail arme extends a metal strip called a strip on the embankment, embanks the strip, and connects the concrete block and the strip installed on the front of the embankment. The embankment weight acts on the strip, the strip functions as an anchor, and the strip connected to this block supports the sediment load.

  If the strip is made of metal, its weight is heavy, and it takes time and labor for construction. In addition, since the strips and the blocks are screwed together with bolts and nuts, the connecting work is troublesome and the construction period becomes long. In addition, since the bolts and nuts used for connecting the strip and the block are made of metal, there is a risk that the connecting portion may be destroyed due to corrosion.

  In order to solve these problems, as described in Japanese Patent Application Laid-Open No. 2006-152786 or Japanese Patent Application Laid-Open No. 2006-152790, an intermediate portion of a strip-shaped strip made of synthetic resin fiber is folded, and the folded portion is We are developing a block that is embedded in the concrete part of the block and integrated with the block.

  However, embedding strips made of synthetic resin fibers directly into the concrete is susceptible to the influence of the alkaline environment, and the concrete particles tend to break into the fibers and break easily, so the strip is placed in the sheath. It was buried in concrete in a state where it passed through. The operation of passing the strip through the sheath is troublesome, and even if it is passed through the sheath, the concrete nodule easily adheres to the strip portion exposed from the sheath, and there is a risk of breakage at that portion.

JP 2006-152786 A JP 2006-152790 A

  The problem to be solved by the present invention is that the connection strength of the fiber belt is reduced due to the size of construction work and the influence of alkali and particles of concrete.

A cement-based hardener product comprising a fiber grid belt according to the present invention comprises a earth retaining block having a plurality of continuous reinforcing portions projecting in the longitudinal direction on the back surface of a plate portion, and a fiber grid belt. A cement-based hardened material product comprising: a part of the reinforcing part formed with a recess capable of accommodating the wound fiber grid belt, and the fiber grid belt covered with a resin coating. One end portion is embedded and fixed in the concave portion of the reinforcing portion.
Furthermore, the cement-based hardened product according to the present invention is characterized in that the fiber grid belt has a grid structure having a plurality of openings.
Further, the cement-based hardener product according to the present invention is characterized in that a plurality of concave portions are formed along the longitudinal direction of the reinforcing portion, and the same number of fiber grid belts as the concave portions are provided.

<a> The grid belt made of fiber can obtain sufficient pulling resistance simply by burying and fixing one end of the resin coating in a cement-based cured material as it is. Is significantly easier to manufacture.
<B> Since the fiber-coated grid belt protrudes from the cement-based hardened material at the remaining part of the resin-coated end portion, the portion where the paste near the hardened material is easily attached becomes a resin-coated portion, There is no entry between the fibers, eliminating the major cause of breakage.
<C> As a grid belt made of fiber, it is passed between a plurality of warp yarns continuous in the longitudinal direction of the belt arranged in parallel at intervals and warp yarns in the width direction of the belt, and appropriately in the longitudinal direction of the warp yarns By adopting a belt-like belt formed in a grid shape with wefts that are passed at intervals, the hardening material enters between the lattices, and the pulling resistance increases.
<D> Since a grid belt made of fiber woven with synthetic resin fibers is used, the frictional force is increased by the unevenness of the surface, and the pulling resistance is increased.
<E> Since the fiber grid belt is used, it is lightweight and flexible, so that it is easy to lay on the embankment and the workability is remarkably improved. In particular, since portions other than the base end portion are not coated with resin, the flexibility thereof is not impaired, and transportation and installation work are not hindered.
<F> Since one end of the grid belt made of fiber is embedded and integrated in the reinforcing part of the retaining block, there is no connection part using bolts and nuts, there is no need for connection work, and corrosion of the connection part No worries at all.
<G> There is no need to insert a fiber grid belt into a sheath, and the construction is simple.
<H> By storing the fiber grid belt in the protective means, it is possible to prevent deterioration from ultraviolet rays and adhesion of concrete from manufacturing to storage / shipping and on-site construction. The strength of can be kept higher.

It is a perspective view of a cementitious hardening material product. It is a partial perspective view of the earth retaining block to which the grid belt is fixed. It is a perspective view of the earth retaining method using a cement type hardening material product. It is sectional drawing of the earth retaining method using a cement-type hardening material product. It is a rear view of a earth retaining block. It is a rear view of a earth retaining block. It is a partial front view of a grid belt made of fiber. It is a perspective view of the state which poured concrete into a mold and manufactures a cement hardening material product.

Hereinafter, the present invention will be described in detail with reference to the drawings.
The cement-based hardened material product according to the present invention comprises a retaining block 1 and a fiber grid belt 5. Each component will be described in detail below.

<1> Earth retaining block An example of the earth retaining block 1 is shown in FIG. The earth retaining block 1 has parallel reinforcing portions 3 and 3 that protrude in the vertical direction on the back surface of the plate portion 2 that serves as a retaining wall surface.
The earth retaining block 1 is a block integrally formed with a cement-based hardener, and a plurality of recesses 4 are provided on the back surface of each reinforcing portion 3 at appropriate positions spaced apart vertically. A single recess 4 may be provided for each reinforcing portion 3.
As the cement-based hardener, it is possible to use known materials such as mortar and resin in addition to the known concrete 14.

<2> Grid belt The grid belt 5 which is a retentive material of the earth retaining block 1 is a belt-like belt made of fiber which has high tensile strength and hardly corrodes.
As the fiber grid belt 5, for example, a thin polyester fiber having a thickness of about several μ to several mm is interwoven with woven fabric warp yarns 7 and weft yarns 8 so as to have a large number of openings. Presents a grid structure.
Since the grid belt 5 is knitted with fine fibers made of woven fabric, knitted fabric, or braided fabric, the vertical lines 7 also have fine irregularities on the surface of the horizontal lines 8.

<3> Coating Fiber grid belt 5 has at least one end portion embedded and fixed with a resin coating, and is coated with a resin coating for a desired length L from the end. (FIG. 7).
By covering the surface of the grid belt 5 with a resin, the grid belt 5 is prevented from coming into direct contact with the concrete 14 to prevent the alkali components of the concrete and particles of noro from entering between the fibers.
In other words, the resin coating functions to protect the grid belt 5 from external deterioration factors such as scratches caused by the entry of particles and water pressure of the concrete 14.
As the resin to be coated, a thermosetting resin or a thermoplastic resin can be used. As a specific material resin, when the material of the fiber grid belt 5 is a thermoplastic fiber, the material properties are not significantly changed. It is desirable to use a room temperature epoxy resin or a urethane resin, and when the material is carbon fiber or aramid fiber having high heat resistance, it is desirable to use a resin made of a thermosetting resin.
In the embodiment, urethane resin is used. As a coating method, a method in which one end of a belt is impregnated into a resin melted at room temperature is used.
By coating the resin, the grid belt 5 made of flexible fibers is hardened like a plate and the flexibility is impaired. However, the resin-coated portion is only a part of the grid belt 5, and the other portions The portion does not cover the resin and does not impair the flexibility as a fiber grid belt. Therefore, the grid belt 5 can be wound up and the like, and it becomes compact during transportation, and the work of unwinding the grid belt 5 wound during construction and laying it on the embankment can be easily performed.

<4> Fixing the grid belt A part La of the total length L of the resin-coated end of such a fiber grid belt 5 is buried in the concrete 14 poured into the formwork 13 and poured into the concrete. 14 is attached and fixed integrally. (Fig. 8)
The fiber grid belt 5 is positioned in a state where it is wound up on a pipe 15 passed over a formwork 13 so that the concrete 14 does not adhere.
The resin-coated end portion does not embed the entire length L in the concrete 14 but only a portion La of the resin-coated end portion embedded in the concrete 14, and the remaining portion Lb protrudes from the concrete 14. It is good to leave it.
The embedment length La is about 50 mm to 300 mm, and actually a suitable connection strength is obtained even about 100 mm. In particular, since the end portion of the grid belt 5 coated with the resin coating also has a grid structure, the connection strength with the concrete 14 is higher than that of the flat strip.
The embedded portion La of the grid belt 5 is surely covered with the resin coating, but as described above, the covering portion having the desired length Lb of the portion coming out of the concrete 14 is useful for avoiding adhesion of the concrete paste. (FIG. 4, FIG. 7).
In this way, the portion protruding from the concrete 14 is also covered with the desired length Lb, so that even if noro adheres to the grid belt 5 near the concrete 14, particles may enter between the fibers. There is no.
In other areas of the grid belt 5 exposed from the recesses 4 of the reinforcing blocks 3 and 3 of the earth retaining block 1, the cement-based hardener paste may not adhere and the particles may enter between the fibers. Absent.
As shown in FIG. 1, FIG. 5 or FIG. 6, the grid belt 5 may be fixed either horizontally or vertically in the width direction of the grid belt 5.
When the grid belt 5 is in a grid shape, aggregates or the like enter into the lattice-shaped gaps, the adhesion force with the concrete (hardening material) 14 is increased, and the pulling resistance is increased.
Further, since the grid belt 5 is made of fibers, the woven, knitted or assembled fibers become irregularities on the surface of the belt, and the frictional resistance of the surface of the grid belt 5 is increased. The pulling resistance with the concrete 14 as a hardener is further increased.

<5> Protection of Grid Belt It is preferable that the grid belt 5 is wound up before construction on site and stored in a storage box 9 which is a protection means.
The storage box 9 can be widely used, such as those made of paper or plastic.
As shown in FIG. 2, the storage box 9 has a size and shape that can be stored in the recess 4 of the block 1, and one end of the grid belt 5 protrudes from the mouth. The side opposite to the bottom is a lid 10.
Further, if the storage box 9 is dark, the fibers of the grid belt 5 inside can be protected from ultraviolet rays.
When used as the grid belt 5 at the time of construction, the box 9 may be opened and pulled out.
As another protection means of the wound grid belt 5, in addition to the box, the grid belt 5 may be stored in a dark bag made of synthetic resin.

<6> Construction of Retaining Wall A case where a retaining wall is constructed using the cement-based hardened material product including the fiber grid belt 5 as described above will be described. The earth retaining blocks 1 constituting the cement-based cured product are laid up and down and left and right on the front surface of the embankment position.
The embankment 11 is applied behind the earth retaining block 1, the grid belt 5 is pulled out from the back surface of the earth retaining block 1, and is extended on the embankment 11.
Further, a bank 11 is applied to the grid belt 5 and fixed by friction with the soil.
Since the grid belt 5 has a grid shape, the frictional force is increased and the fixing force with respect to the embankment 11 is improved.
Further, since the grid belt 5 is made of fiber, the material itself has a large frictional force, and the fixing force is increased.
When the first-stage construction is completed, the upper grid belt 5 is stretched on the first-stage fill 11, and the same operation as described above is repeated.

<7> Connection Strength of Grid Belt The connection strength test result of the grid belt 5 coated with the resin as described above is shown in Table 1 below.
As shown in Table 1, the connecting strength of the resin-coated grid belt 5 is about twice as strong as when the resin coating is not performed. In terms of the type of resin, there was no significant difference in breaking load between epoxy resin and urethane resin.

<8> Breaking condition The resin-coated fiber-made grid belt 5 was not broken at the resin-coated portion, and was broken at the resin interface portion or the dirty portion was broken. That is, the resin-coated portion has a higher strength than those portions.
Therefore, as in the present invention, it is possible to maintain the strength of the grid belt 5 by resin-covering the portion embedded in the cement-based hardened material and the vicinity where the hardened material protruding from the hardened material is likely to adhere. Is extremely effective.
Moreover, in the experiment example which did not coat | cover resin, although the embedding depth was changed into 150 mm and 200 mm, the test was implemented, but all were fractured | ruptured in the concrete interface part.

1: Earth retaining block 2: Plate portion 3: Reinforcement portion 4: Recessed portion 5: Grid belt 6: Belt-like woven fabric 7: Fine band 8: String body 9: Storage box 10: Cover 11: Filling 12: Retaining wall 13: Mold Frame 14: Concrete

Claims (3)

A cement-based hardener product comprising a retaining block having a plurality of continuous reinforcing portions projecting in the longitudinal direction on the back surface of the plate portion, and a fiber grid belt,
Forming a recessed portion capable of accommodating the wound fiber grid belt in a part of the reinforcing portion;
One end of the fiber grid belt covered with a resin coating is embedded and fixed in a recess of the reinforcing portion,
Cement-based hardened product.   The cement-based hardener product according to claim 1, wherein the fiber grid belt has a grid structure having a plurality of openings.   The cement-based hardener product according to claim 1 or 2, wherein a plurality of concave portions are formed along the longitudinal direction of the reinforcing portion, and the same number of fiber grid belts as the concave portions are provided.

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