JP2003245912A - Abrasion-resistant pre-cast concrete member for civil engineering structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abrasion-resistant pre-cast concrete member equipped with applicability and durability which is used for a civil engineering structure, and equipped with an abrasion-detecting means by which a replacement timing can be easily found even when the concrete member cannot withstand use any more by the abrasion due to the use over a long period of time. <P>SOLUTION: This abrasion-resistant pre-cast concrete member 1 for a civil engineering structure is used for repairing the civil engineering structure provided under a condition with severe abrasion, or the abraded section of an existing civil engineering structure and equipped with the abrasion-detecting means 13 which displays an allowable abrasion depth. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wear-resistant precast concrete member for civil engineering structures, and more specifically,
The present invention relates to a wear-resistant precast concrete member for civil engineering structures, which is used for repairing a site where abrasion resistance is required in a new civil engineering structure or a worn portion of an existing civil engineering structure.

[0002]

2. Description of the Related Art Civil engineering structures have the fear of being subject to severe wear depending on the natural environment conditions and artificial conditions of use. Examples of structures that are subject to wear damage due to natural factors include port structures and river structures, while examples of structures that are subject to wear damage due to human factors include road structures. Although the physical factors that cause wear of each of these civil engineering structures are different from each other, when viewed from the viewpoint of maintenance and repair, in both cases, rapid diagnosis in use and means for functional recovery are required. Absent.

For example, there are water intake weirs, erosion control dams, floor stoppers, etc. as water use structures installed for the purpose of water intake from rivers and drainage channels and river bed stabilization. The surface of the weir body and the apron part of these irrigation structures is gradually abraded by the flow of sediment, and the main causes thereof are impacts due to the flow of gravel, abrasion and cavitation. In particular, since the length of rivers in Japan is short and steep, the progress of damage to the weir body and apron surface of irrigation structures is remarkable, and there is a problem that repairs are required in a short period of time.

As a protective measure construction method for preventing the abrasion of the surface of the apron portion, (1) a method of improving the quality of concrete in the apron portion. (2) A method in which a wear resistant material is mixed into concrete in the apron. (3) There is a method of forming a wear resistant layer on the concrete surface of the apron part, but from a comprehensive perspective, the method of (1) above is suitable,
Among them, high strength concrete is desirable.

However, the above methods (1) and (2) are methods that can be mainly used only when new construction is performed, and the method (3) is suitable for existing water use structures. That is, in order to repair the apron part of an existing water use structure and form a wear resistant layer on the concrete surface of the apron part, it is optimal to adopt the method of (3) above. The construction methods A) to (E) are considered.

(A) Stone lining method: Conventionally, stone lining, Machi stone lining, Noh stone lining, etc. have been used and have excellent impact resistance and abrasion resistance. (B) Steel plate and cast steel plate tensioning method: A steel plate is welded and fixed to an anchor that is driven into a concrete base, and has excellent impact resistance and wear resistance.
(C) Epoxy resin mortar method: A method in which a mixture of epoxy resin and silica sand is directly placed on the foundation concrete and has good wear resistance.

(D) Elastic plate construction method: A polyurethane type elastic plate is fixed to the foundation concrete with anchor bolts, etc., and the elastic plate has a large impact absorbing effect and is particularly excellent in impact resistance and abrasion resistance. . (E) Resin concrete construction method: The resin concrete is directly placed on the base concrete, and it has excellent impact resistance and abrasion resistance.
It has the advantage that construction is easy without the need for heavy machinery.

[0008]

However, in the above-mentioned (A) stone-clad construction method, there is a problem of separation from cutting stones, machinite stones, field stones and ground concrete. In recent years, it has been difficult to obtain high-quality stone materials, and skilled masonry is in short supply. (B) In the steel plate and cast steel plate construction method, the steel plate and the base concrete separate from each other due to temperature stress, and the steel plate becomes wavy due to the impact of boulders and boulders, and the convex portions locally tend to wear more than expected. There is. Moreover, the welding work is not easy because the construction is not easy, and there is a step between the steel plates laid next to each other.
There is also a problem that the step portion is significantly worn due to cavitation. There are also landscape issues.

Further, the (C) epoxy resin mortar construction method has a problem in that it is peeled off from the base concrete and the mortar layer is thin, so that it is not very effective. And again
(D) The elastic plate method has a difficulty in adhesion to the base concrete, and there is a possibility that the sand flow flows into the gap between the base concrete and the elastic plate to separate the elastic plate. Further, there are problems that the construction is not easy and the construction cost is high.

Furthermore, the (E) resin concrete method is
Since it takes days to dry the base concrete and to cure the resin concrete placed on the base concrete, the resin concrete is more than 10 times the price of ordinary concrete, and the construction cost is high. In addition, the resin concrete generated during the re-repair cannot be reused, so that the economical loss is large and the industrial waste becomes a problem in its treatment.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is easy to carry out the construction and surely separates the wear-resistant precast concrete member installed in the wear portion from the wear portion. It can be prevented,
Civil engineering structures that can be easily visually discerned when to replace and prevent local wear by eliminating the occurrence of steps, especially water use structures such as intake weirs, erosion control dams, or floor stoppers. An object of the present invention is to provide a wear-resistant precast concrete member for civil engineering structures, which is equipped with a wear detecting means used for new construction or repair.

[0012]

In order to achieve the above object, the first to third inventions of the present application are to repair a civil engineering structure installed under severely worn conditions, or to repair a worn portion of an existing civil engineering structure. A wear-resistant precast concrete member for use in, wherein the wear-resistant precast concrete member is equipped with wear detection means for displaying an allowable wear depth, and is a wear-resistant precast concrete member for civil engineering structures. As a result, the allowable wear limit of the wear-resistant precast concrete member can be visually determined to easily know the replacement time, which facilitates maintenance management.

Since the wear-resistant precast concrete member is a precast member manufactured in a factory, it is possible to supply a stable product without quality variations. In particular, compared to cast-in-place concrete, when precast members are used, it is easier to make high-strength concrete by kneading, and it is possible to provide those with excellent durability and wear resistance. By changing the concrete strength, it is possible to select a wear-resistant grade according to the installation location. Moreover, since no on-site curing is required, the service can be started earlier and the construction period can be shortened.

The fourth and fifth inventions of the present application are the wear-resistant precast concrete member so that the grout material filled between the wear-resistant precast concrete member and the ground or wear portion of the civil engineering structure does not adhere. It is characterized in that it has an adhesion preventing means on its back surface. As a result, the wear-resistant precast concrete member can be detached from the worn portion of the civil engineering structure, and only the wear-resistant precast concrete member installed in the heavily worn portion can be replaced. Therefore, maintenance is easy, and if the degree of wear is not so great, it can be reused for other parts.
The anti-adhesion means is achieved by applying a paint or a resin, or by attaching an anti-adhesion sheet.

Further, the sixth to eighth inventions of the present application are provided with step adjusting means at a plurality of positions of the wear-resistant precast concrete member. By adjusting the installation height with this step adjusting means, it is possible to install without installing a step between the connecting portions of the wear-resistant precast concrete members that are laid side by side, and prevent cavitation and local wear. The durability is improved.

Further, in order to achieve the above object, the ninth invention of the present application is to form a grout material injection hole penetrating from the front surface to the back surface in the wear-resistant precast concrete member. Thus, when the grout material is injected into the gap between the wear-resistant precast concrete member and the worn portion, the grout material can be injected from the surface side of the installed wear-resistant precast concrete member and the laying work can be easily performed.

Further, a tenth invention of the present application is that the wear-resistant precast concrete member has a multi-layer structure of a layer containing reinforcing fibers and a layer not containing reinforcing fibers. As a result, the structural strength of the wear-resistant precast concrete member is improved, the occurrence of cracks and the like is reduced, and the durability is improved. Laying work becomes easy.

The reinforcing fiber to be used may be any of organic fiber such as steel fiber, aramid fiber, vinylon fiber, carbon fiber, glass fiber, and the like. Use is desirable.
The reason why the layered structure is adopted is that, for example, when steel fibers are used, if the steel fibers are exposed at the surface layer, there is a fear of damaging the body of an operator. Of course, when such a problem does not occur, the fiber-mixed layer may be provided in the surface layer portion in order to improve the wear resistance of the surface layer portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a wear-resistant precast concrete member for civil engineering structures according to the present invention (hereinafter referred to as precast concrete member). )so,
In the illustrated example, the length is 199 cm, the width is 99 cm, and the thickness is 8 c.
m is a rectangular plate-shaped body in plan view, concrete with high compressive strength mixed with silica fume, W / C
It is made of concrete with high strength by reducing (water-cement ratio) or resin concrete with high impact resistance and abrasion resistance, and its lower surface (back surface) is coated with a coating that does not adhere to the grout material described later. An anti-adhesion layer 2 having a layer or a vinyl sheet installed thereon is formed.

Further, the precast concrete member 1 has three kinds of holes penetrating from the front surface 1a to the adhesion preventing layer 2 on the back surface thereof, that is, in order from the center of the precast concrete member 1, the grout material injection holes 3, 3. An anchor bolt hole 4 and a step adjusting bolt hole 5 are formed respectively. The grout material injection holes 3 are provided at two positions on the center line in the longitudinal direction of the precast concrete member 1 and are spaced apart from each other on the left and right, and the lower opening has a larger diameter than the upper opening so that the grout material 18 to be described later is provided. The structure is such that the back side of the precast concrete member 1 can be easily filled.

Anchor bolt holes 4 are provided at four positions outside the grout material injection hole 3, and are fastened to the anchor bolt 6 from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface. The large diameter concave portion 4a corresponding to the diameter of the nut 7 and the small diameter portion 4b corresponding to the diameter of the anchor bolt 6 are formed.

Reference numeral 5 denotes a step adjusting bolt hole, which is provided outside the anchor bolt hole 4 in the vicinity of the four corners of the precast concrete member 1. The step adjusting bolt hole 5 has a large-diameter recess 5a from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface.
And a small-diameter portion 5b, and an insert 8 having an internal thread is embedded inside the small-diameter portion 5b.

A wear detecting means 12 is composed of a wear detecting plate 13 having a color tone different from the concrete color, and a nearly box-shaped leg 14 protruding from the lower surface of the wear detecting plate 13. The wear detection plate 13 is installed at a position (a position of an allowable wear allowance) L at a predetermined depth from the surface 1a of the precast concrete member 1 by fixing it to a reinforcing rebar embedded in the precast concrete member 1 by a method described later. It is configured to do.

More specifically, referring to FIG. 4, the leg 14 is composed of front and rear leg portions 15 and 15 which face each other and left and right leg portions which face each other (not shown). Reinforcing bar holding portion 15 formed at the lower end
a, 15a, a lower reinforcing reinforcing bar X embedded in the precast concrete member 1 and an upper reinforcing reinforcing bar X intersecting with the reinforcing reinforcing bar X by a reinforcing bar holding portion extending from the lower end to the upper part of both left and right legs not shown. It is configured to hold each Y.

By selecting the leg 14 having a desired height, the wear detecting plate 13 is reinforced by the reinforcing bar X,
It is horizontally installed at the intersection L of the precast concrete members 1 at the allowable wear margin position L. This allows
When the upper surface of the precast concrete member 1 wears to the position L of the allowable wear allowance, the wear detection plate 13 appears on the surface 1a, and it can be detected that the wear of the precast concrete member 1 has reached the limit.

Although not shown, the wear detecting plate 13 is not used, and the precast concrete member 1 is divided into an upper layer and a lower layer at a depth L of the allowable wear margin from the surface 1a, and the upper layer is colored. Instead, the upper layer and the lower layer may have different color tones, such as by coloring the lower layer, so that the wear detecting unit can be used. In this case, since the entire cross section has the function, it can be applied to any environmental condition, and the precast concrete member itself has the wear detecting function, which is advantageous in terms of cost.

In the present invention, although not shown, the precast concrete member 1 may have a two-layer structure of a lower layer containing steel fibers and an upper layer containing no steel fibers. In this case, While the strength of the precast concrete member can be improved to prevent the occurrence of cracks and the like, the overall thickness and thickness of the precast concrete member can be reduced, and the repair work of the worn portion becomes easier. Of course, as described above, other reinforcing fibers can be substituted for the steel fiber, and the above object can be achieved by using the reinforcing fiber mixed layer as the upper layer and not mixing the fiber in the lower layer. In this case, the effect of improving the wear resistance and impact resistance of the upper layer can be expected,
Measures are taken such as changing the material of the reinforcing fiber so that the fiber will not corrode or be exposed to the surface layer.

Next, referring to FIG. 5, a method of repairing a worn portion of a water structure using the precast concrete member 1 will be described. First, in FIG. Existing concrete 17a
Then, the base concrete 17b is formed as shown in FIG. Next, as shown in FIG. 2C, anchor bolts 6 and 6 are driven into predetermined positions of the base concrete 17b, and as shown in FIG. 2D, the precast concrete member 1 is attached to the anchor bolt holes 4 thereof.
The anchor bolts 6 are respectively inserted therein, and are laid side by side on the concrete foundation 17b.

Since the plate 11 mounted via the annular elastic packing 10 or the universal joint portion is projected from the back surface of the precast concrete member 1, the precast concrete member 1 is connected to the base concrete 17b through the plate 11. Since it will be laid on top, a gap S is formed between the surface of the base concrete 17b and the back surface of the precast concrete member 1.

Further, the surface of the base concrete 17b has irregularities, and a step is often generated between the precast concrete members 1 and 1 laid side by side on the surface. Since this step causes a large amount of wear due to cavitation of the water flow, it is necessary to lay it so as not to generate a step between the adjacent precast concrete members 1 and 1. In order to prevent such a step from occurring, FIG.
The height of the precast concrete members 1 is adjusted by the step adjusting means shown in, and fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

More specifically, in FIG. 6, reference numeral 9 denotes a step adjusting bolt screwed into the insert 8 of the step adjusting bolt hole 5 so that the tip of the step adjusting bolt can be projected and retracted from the back surface of the precast concrete member 1. Is configured,
A plate 11 mounted on the back surface of the precast concrete member 1 through an elastic packing 10 having an inner cross section.
Is installed at a position where the tip of the step adjusting bolt 9 abuts. Here, examples of the shape of the elastic packing 10 having the inner cross section include an annular shape, a quadrangular shape,
Hexagonal shape and the like can be mentioned. Although not shown, the object of the present invention can be achieved by directly attaching the plate 11 to the tip of the step adjusting bolt 9 via a universal joint.

Therefore, when the height of the precast concrete member 1 is adjusted, for example, when the precast concrete member 1 is lowered from the state shown by the solid line in FIG. 6 to the state shown by the chain line, the step adjusting bolt 9 is rotated counterclockwise and the tip portion thereof is rotated. Are moved inward of the precast concrete member 1. As a result, the distance between the tip of the step adjusting bolt 9 and the plate 11 is increased by the distance that the tip of the step adjusting bolt 9 moves upward, or the universal joint is attached to the tip of the step adjusting bolt 9. In the plate 11 mounted so as to be rotatable via the
A gap is formed between the above and the step adjusting bolt 9 and the plate 11 by the distance moved upward.

As a result, the precast concrete member 1 is lowered by the distance of the gap due to its own weight, and the position where the tip of the step adjusting bolt 9 again contacts the plate 11 or the lower surface of the plate 11 is again the base. It stops at the position where it comes into contact with the concrete 17b. By repeating the above work, fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

Next, as shown in FIGS. 5 (f) and 7,
After the nut 7 is screwed into the anchor bolt 6 projecting into the large-diameter recess 4a of the anchor bolt hole 4 and the precast concrete member 1 is firmly fixed to the foundation concrete 17b, the structure shown in FIGS. The grout material 18 is injected from the grout material injection hole 3 as shown in FIG. The grout material 18 injected from the grout material injection hole 3 fills the gap S between the precast concrete member 1 and the base concrete 17b.

As a result, the precast concrete member 1 passes through the grout material 18 and the base concrete 17b.
However, the back surface of the precast concrete member 1 and the surface of the base concrete 17b are in close contact with the grout material 18, respectively. As a result, the sediment flow does not enter between the precast concrete member 1 and the base concrete 17b, and the precast concrete member 1 can be reliably prevented from peeling off from the base concrete 17b.

Here, the precast concrete member 1
Since the adhesion preventing layer 2 which does not adhere to the grout material 18 is formed on the back surface of the precast concrete member 1, the back surface of the precast concrete member 1 is in close contact with the grout material 18 but is in an edge cut state. Therefore, the precast concrete member 1 can be easily removed from the base concrete 17b if necessary even after a long period of time since the installation, and the precast concrete member 1 installed in a portion of the irrigation structure where the wear is severe. Only the one can be replaced and if the degree of wear is not too great, it can be reused for other parts.

Next, as shown in FIGS. 6 and 7, the caps 19 are placed on the step adjusting bolts 9, the anchor bolts 6, and the nuts 7, respectively, and then the surface 1a of the precast concrete member 1 is mounted. When the filling material 20 having wear resistance equivalent to that of the precast concrete member 1 is filled in the recesses of the grout material injection hole 3, the anchor bolt hole 4 and the step adjusting bolt hole 5, which are opened, the precast concrete member 1, The joint material 21 such as an elastic filler is filled in the joint portion between the first and second parts, and the repair work of the worn portion of the irrigation structure is completed.

After a long time has passed since the repair,
When the surface 1a of the precast concrete member 1 is worn to the position L of the allowable wear margin, the wear detection plate 13 embedded at the position L of the allowable wear margin is exposed on the surface of the precast concrete member 1. Since this wear detection plate 13 is colored differently from the concrete color of the precast concrete member 1, it can be easily discriminated from the outside. This wear detection plate 13
It is possible to know that it is time to replace the precast concrete member 1 by exposing the precast concrete member 1 to the outside. In this case, the worn precast concrete member 1 is replaced with the ground concrete 17b in the reverse order of the construction process.
Remove from and replace with a new one.

In the above embodiment, the wear-resistant precast concrete member used for repairing the worn portion of the already worn water-filled structure has been described. It goes without saying that it can be installed in civil engineering structures other than irrigation structures, such as road structures and piers, where they are susceptible to wear or in whole. Furthermore, the wear-resistant precast concrete member is designed to have a free shape and dimension according to the cross-sectional shape of the civil engineering structure that is installed under severely worn conditions, or the abraded portion of the civil engineering structure that has already been abraded. The prepared one can be used.

As the method of grouting between the base concrete and the wear-resistant precast concrete member, an injection method suitable for the situation at the site can be selected. For example, when the gap between the base concrete and the wear-resistant precast concrete member is relatively large, the grout material injection hole is not provided in the wear-resistant precast concrete member in advance, and the fluidity from the joint between the wear-resistant precast concrete members is excellent. It is also possible to inject grout material.

[0041]

Since the present invention has the above-mentioned structure,
(1) Since it is manufactured in a factory, there is no variation in quality and stable supply is possible. (2) By changing the concrete strength, various wear resistant grades can be selected according to the degree of wear, and it is possible to freely respond to the installation location. (3) It has superior durability and wear resistance as compared with cast-in-place concrete, and has improved durability and can be used for a long period of time. (4) High-strength concrete is more cost effective and economical than other materials (resin, elastic plate, steel plate).

Further, (5) the replacement timing can be determined from the outside, and maintenance management is easy. (6) It is economical from the viewpoint of life cycle cost because the wear-resistant precast concrete member in a portion that is heavily worn can be replaced by a simple construction method and can be reused. (7) Since no local curing is required, the construction period can be shortened and the start of use can be accelerated. (8) Further, it is possible to easily adjust the level difference when laying, and it is possible to suppress local concentration of wear and improve durability. (9) Further, there are various effects that the generation of construction waste can be suppressed by making it possible to prolong the life of the wear-resistant precast concrete member and reuse it.

[Brief description of drawings]

FIG. 1 is a plan view of a wear-resistant precast concrete member according to the present invention.

FIG. 2 is a front view of the wear resistant precast concrete member.

FIG. 3 is an enlarged partial sectional view of the wear-resistant precast concrete member.

FIG. 4 is a front view showing an installed state of wear detecting means.

FIG. 5 is an explanatory view showing a procedure for installing a wear-resistant precast concrete member on a wear part.

FIG. 6 is an enlarged cross-sectional partial explanatory view of step adjustment.

FIG. 7 is an enlarged partial cross-sectional view of a fixed portion.

FIG. 8 is an enlarged sectional partial view of a laid state.

[Explanation of symbols]

1 Wear-resistant precast concrete members 1a surface 2 Adhesion prevention layer 3 Grout material injection hole 4 anchor bolt holes 5 Step adjustment bolt hole 6 anchor bolts 9 Step adjustment bolt 10 packing 11 plates 12 Wear detection means 13 Wear detection plate 14 legs 15a Reinforcing bar holding part 17 Worn part 17b Base concrete 18 grout 19 cap S gap

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 7, 2002 (2002.10.
7)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Abrasion resistant precast concrete member for civil engineering structures

[Claims]

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wear-resistant precast concrete member for civil engineering structures, and more specifically,
The present invention relates to a wear-resistant precast concrete member for civil engineering structures, which is used for repairing a site where abrasion resistance is required in a new civil engineering structure or a worn portion of an existing civil engineering structure.

[0002]

2. Description of the Related Art Civil engineering structures have the fear of being subject to severe wear depending on the natural environment conditions and artificial conditions of use. Examples of structures that are subject to wear damage due to natural factors include port structures and river structures, while examples of structures that are subject to wear damage due to human factors include road structures. Although the physical factors that cause wear of each of these civil engineering structures are different from each other, when viewed from the viewpoint of maintenance and repair, in both cases, rapid diagnosis in use and means for functional recovery are required. Absent.

For example, there are water intake weirs, erosion control dams, floor stoppers, etc. as water use structures installed for the purpose of water intake from rivers and drainage channels and river bed stabilization. The surface of the weir body and the apron part of these irrigation structures is gradually abraded by the flow of sediment, and the main causes thereof are impacts due to the flow of gravel, abrasion and cavitation. In particular, since the length of rivers in Japan is short and steep, the progress of damage to the weir body and apron surface of irrigation structures is remarkable, and there is a problem that repairs are required in a short period of time.

As a protective measure construction method for preventing the abrasion of the surface of the apron portion, (1) a method of improving the quality of concrete in the apron portion. (2) A method in which a wear resistant material is mixed into concrete in the apron. (3) There is a method of forming a wear resistant layer on the concrete surface of the apron part, but from a comprehensive perspective, the method of (1) above is suitable,
Among them, high strength concrete is desirable.

However, the above methods (1) and (2) are methods that can be mainly used only when new construction is performed, and the method (3) is suitable for existing water use structures. That is, in order to repair the apron part of an existing water use structure and form a wear resistant layer on the concrete surface of the apron part, it is optimal to adopt the method of (3) above. The construction methods A) to (E) are considered.

(A) Stone lining method: Conventionally, stone lining, Machi stone lining, Noh stone lining, etc. have been used and have excellent impact resistance and abrasion resistance. (B) Steel plate and cast steel plate tensioning method: A steel plate is welded and fixed to an anchor that is driven into a concrete base, and has excellent impact resistance and wear resistance.
(C) Epoxy resin mortar method: A method in which a mixture of epoxy resin and silica sand is directly placed on the foundation concrete and has good wear resistance.

(D) Elastic plate construction method: A polyurethane type elastic plate is fixed to the foundation concrete with anchor bolts, etc., and the elastic plate has a large impact absorbing effect and is particularly excellent in impact resistance and abrasion resistance. . (E) Resin concrete construction method: The resin concrete is directly placed on the base concrete, and it has excellent impact resistance and abrasion resistance.
It has the advantage that construction is easy without the need for heavy machinery.

[0008]

However, in the above-mentioned (A) stone-clad construction method, there is a problem of separation from cutting stones, machinite stones, field stones and ground concrete. In recent years, it has been difficult to obtain high-quality stone materials, and skilled masonry is in short supply. (B) In the steel plate and cast steel plate construction method, the steel plate and the base concrete separate from each other due to temperature stress, and the steel plate becomes wavy due to the impact of boulders and boulders, and the convex portions locally tend to wear more than expected. There is. Moreover, the welding work is not easy because the construction is not easy, and there is a step between the steel plates laid next to each other.
There is also a problem that the step portion is significantly worn due to cavitation. There are also landscape issues.

Further, the (C) epoxy resin mortar construction method has a problem in that it is peeled off from the base concrete and the mortar layer is thin, so that it is not very effective. And again
(D) The elastic plate method has a difficulty in adhesion to the base concrete, and there is a possibility that the sand flow flows into the gap between the base concrete and the elastic plate to separate the elastic plate. Further, there are problems that the construction is not easy and the construction cost is high.

Furthermore, the (E) resin concrete method is
Since it takes days to dry the base concrete and to cure the resin concrete placed on the base concrete, the resin concrete is more than 10 times the price of ordinary concrete, and the construction cost is high. In addition, the resin concrete generated during the re-repair cannot be reused, so that the economical loss is large and the industrial waste becomes a problem in its treatment.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is easy to carry out the construction and surely separates the wear-resistant precast concrete member installed in the wear portion from the wear portion. It can be prevented,
Civil engineering structures that can be easily visually discerned when to replace and prevent local wear by eliminating the occurrence of steps, especially water use structures such as intake weirs, erosion control dams, or floor stoppers. An object of the present invention is to provide a wear-resistant precast concrete member for civil engineering structures, which is equipped with a wear detecting means used for new construction or repair.

[0012]

In order to achieve the above-mentioned object, the first invention of the present application is provided under a condition of severe wear.
For repairing existing civil engineering structures or worn parts of existing civil engineering structures
Abrasion resistant precast concrete for used civil engineering structures
And the wear-resistant precast concrete part
Color and color of concrete embedded to a specified depth from the surface of the material
Equipped with wear detection means having wear detection plates with different
By the wear detecting means, the wear-resistant precast core
A wear- resistant precast concrete member for civil engineering structures, which displays the allowable wear depth of the concrete member. As a result, the allowable wear limit of the wear-resistant precast concrete member can be visually determined to easily know the replacement time, which facilitates maintenance management.

Since the wear-resistant precast concrete member is a precast member manufactured in a factory, it is possible to supply a stable product without quality variations. In particular, compared to cast-in-place concrete, when precast members are used, it is easier to make high-strength concrete by kneading, and it is possible to provide those with excellent durability and wear resistance. By changing the concrete strength, it is possible to select a wear-resistant grade according to the installation location. Moreover, since no on-site curing is required, the service can be started earlier and the construction period can be shortened.

The second invention of the present application is the wear detecting hand.
The step is a protrusion protruding from the lower surface of the wear detection plate.
If you have a box-shaped leg,
It consists of both legs and the left and right legs that also face each other.
Before and after the rebar holding part formed at the lower end of both legs before and after
The bottom of the wear resistant precast concrete member embedded in
Side reinforcing bars from the lower end of the left and right legs to the upper part
Crosses the lower reinforcing bar by the extended reinforcing bar holding part
It has a special feature that it is configured to hold the upper reinforcing bars respectively.
Wear-resistant precast concrete for civil engineering structures
It is a member. Thus selecting the leg of the desired height
The wear detection plate at the intersection of the reinforcing bars.
Allowable wear of the wear-resistant precast concrete member
It can be installed horizontally at the position of the wear allowance, and the quality varies.
Stable supply of quality products.

The third and fourth inventions of the present application are the wear-resistant precast concrete member so that the grout material filled between the wear-resistant precast concrete member and the ground or wear portion of the civil engineering structure does not adhere. It is characterized in that it has an adhesion preventing means on its back surface. As a result, the wear-resistant precast concrete member can be detached from the worn portion of the civil engineering structure, and only the wear-resistant precast concrete member installed in the heavily worn portion can be replaced. Therefore, maintenance is easy, and if the degree of wear is not so great, it can be reused for other parts.
The anti-adhesion means is achieved by applying a paint or a resin, or by attaching an anti-adhesion sheet.

Further, the fifth to seventh inventions of the present application are provided with step adjusting means at a plurality of locations of the wear-resistant precast concrete member. By adjusting the installation height with this step adjusting means, it is possible to install without installing a step between the connecting portions of the wear-resistant precast concrete members that are laid side by side, and prevent cavitation and local wear. The durability is improved.

Further, in order to achieve the above object, the eighth invention of the present application is to form a grout material injection hole penetrating from the front surface to the back surface in the wear-resistant precast concrete member. Thus, when the grout material is injected into the gap between the wear-resistant precast concrete member and the worn portion, the grout material can be injected from the surface side of the installed wear-resistant precast concrete member and the laying work can be easily performed.

Furthermore, a ninth invention of the present application is the wear-resistant precast concrete member having a multilayer structure of a layer containing reinforcing fibers and a layer not containing reinforcing fibers. As a result, the structural strength of the wear-resistant precast concrete member is improved, the occurrence of cracks and the like is reduced, and the durability is improved. Laying work becomes easy.

The reinforcing fiber to be used may be any of organic fiber such as steel fiber, aramid fiber, vinylon fiber, carbon fiber, glass fiber and the like. Use is desirable.
The reason why the layered structure is adopted is that, for example, when steel fibers are used, if the steel fibers are exposed at the surface layer, there is a fear of damaging the body of an operator. Of course, when such a problem does not occur, the fiber-mixed layer may be provided in the surface layer portion in order to improve the wear resistance of the surface layer portion.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a wear-resistant precast concrete member for civil engineering structures according to the present invention (hereinafter referred to as precast concrete member). )so,
In the illustrated example, the length is 199 cm, the width is 99 cm, and the thickness is 8 c.
m is a rectangular plate-shaped body in plan view, concrete with high compressive strength mixed with silica fume, W / C
It is made of concrete with high strength by reducing (water-cement ratio) or resin concrete with high impact resistance and abrasion resistance, and its lower surface (back surface) is coated with a coating that does not adhere to the grout material described later. An anti-adhesion layer 2 having a layer or a vinyl sheet installed thereon is formed.

Further, the precast concrete member 1 has three kinds of holes penetrating from the front surface 1a to the adhesion preventing layer 2 on the back surface, that is, in order from the center of the precast concrete member 1, the grout material injection holes 3, 3. An anchor bolt hole 4 and a step adjusting bolt hole 5 are formed respectively. The grout material injection holes 3 are provided at two positions on the center line in the longitudinal direction of the precast concrete member 1 and are spaced apart from each other on the left and right, and the lower opening has a larger diameter than the upper opening so that the grout material 18 to be described later is provided. The structure is such that the back side of the precast concrete member 1 can be easily filled.

Anchor bolt holes 4 are provided at four positions outside the grout material injection hole 3, and are fastened to the anchor bolts 6 from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface. The large diameter concave portion 4a corresponding to the diameter of the nut 7 and the small diameter portion 4b corresponding to the diameter of the anchor bolt 6 are formed.

Reference numeral 5 denotes a step adjusting bolt hole, which is provided outside the anchor bolt hole 4 in the vicinity of the four corners of the precast concrete member 1. The step adjusting bolt hole 5 has a large-diameter recess 5a from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface.
And a small-diameter portion 5b, and an insert 8 having an internal thread is embedded inside the small-diameter portion 5b.

A wear detecting means 12 is composed of a wear detecting plate 13 having a color tone different from the concrete color, and a nearly box-shaped leg 14 protruding from the lower surface of the wear detecting plate 13. The wear detection plate 13 is installed at a position (a position of an allowable wear allowance) L at a predetermined depth from the surface 1a of the precast concrete member 1 by fixing it to a reinforcing rebar embedded in the precast concrete member 1 by a method described later. It is configured to do.

More specifically, referring to FIG. 4, the leg 14 is composed of front and rear leg portions 15 and 15 facing each other, and left and right leg portions facing each other (not shown). Reinforcing bar holding portion 15 formed at the lower end
a, 15a, a lower reinforcing reinforcing bar X embedded in the precast concrete member 1 and an upper reinforcing reinforcing bar X intersecting with the reinforcing reinforcing bar X by a reinforcing bar holding portion extending from the lower end to the upper part of both left and right legs not shown. It is configured to hold each Y.

By selecting the leg 14 having a desired height, the wear detecting plate 13 is reinforced by the reinforcing bar X,
It is horizontally installed at the intersection L of the precast concrete members 1 at the allowable wear margin position L. This allows
When the upper surface of the precast concrete member 1 wears to the position L of the allowable wear allowance, the wear detection plate 13 appears on the surface 1a, and it can be detected that the wear of the precast concrete member 1 has reached the limit.

Although not shown, the wear detecting plate 13 is not used, and the precast concrete member 1 is divided into an upper layer and a lower layer from the surface 1a at a depth L of the allowable wear margin, and the upper layer is colored. Instead, the upper layer and the lower layer may have different color tones, such as by coloring the lower layer, so that the wear detecting unit can be used. In this case, since the entire cross section has the function, it can be applied to any environmental condition, and the precast concrete member itself has the wear detecting function, which is advantageous in terms of cost.

In the present invention, although not shown, the precast concrete member 1 may have a two-layer structure of a lower layer containing steel fibers and an upper layer containing no steel fibers. In this case, While the strength of the precast concrete member can be improved to prevent the occurrence of cracks and the like, the overall thickness and thickness of the precast concrete member can be reduced, and the repair work of the worn portion becomes easier. Of course, as described above, other reinforcing fibers can be substituted for the steel fiber, and the above object can be achieved by using the reinforcing fiber mixed layer as the upper layer and not mixing the fiber in the lower layer. In this case, the effect of improving the wear resistance and impact resistance of the upper layer can be expected,
Measures are taken such as changing the material of the reinforcing fiber so that the fiber will not corrode or be exposed to the surface layer.

Next, referring to FIG. 5, a method of repairing a worn portion of the water utilization structure using the precast concrete member 1 will be described. First, in FIG. Existing concrete 17a
Then, the base concrete 17b is formed as shown in FIG. Next, as shown in FIG. 2C, anchor bolts 6 and 6 are driven into predetermined positions of the base concrete 17b, and as shown in FIG. 2D, the precast concrete member 1 is attached to the anchor bolt holes 4 thereof.
The anchor bolts 6 are respectively inserted therein, and are laid side by side on the concrete foundation 17b.

Since the plate 11 mounted via the annular elastic packing 10 or the universal joint portion projects from the back surface of the precast concrete member 1, the precast concrete member 1 is connected to the base concrete 17b through the plate 11. Since it will be laid on top, a gap S is formed between the surface of the base concrete 17b and the back surface of the precast concrete member 1.

The surface of the base concrete 17b is uneven, and a step is often formed between the precast concrete members 1 and 1 laid side by side on the surface. Since this step causes a large amount of wear due to cavitation of the water flow, it is necessary to lay it so as not to generate a step between the adjacent precast concrete members 1 and 1. In order to prevent such a step from occurring, FIG.
The height of the precast concrete members 1 is adjusted by the step adjusting means shown in, and fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

More specifically, in FIG. 6, reference numeral 9 is a step adjusting bolt screwed into the insert 8 of the step adjusting bolt hole 5 so that the tip of the step adjusting bolt can be projected and retracted from the back surface of the precast concrete member 1. Is configured,
A plate 11 mounted on the back surface of the precast concrete member 1 through an elastic packing 10 having an inner cross section.
Is installed at a position where the tip of the step adjusting bolt 9 abuts. Here, examples of the shape of the elastic packing 10 having the inner cross section include an annular shape, a quadrangular shape,
Hexagonal shape and the like can be mentioned. Although not shown, the object of the present invention can be achieved by directly attaching the plate 11 to the tip of the step adjusting bolt 9 via a universal joint.

Therefore, when the height of the precast concrete member 1 is adjusted, for example, when the precast concrete member 1 is lowered from the state shown by the solid line in FIG. 6 to the state shown by the chain line, the step adjusting bolt 9 is rotated counterclockwise and the tip portion thereof is rotated. Are moved inward of the precast concrete member 1. As a result, the distance between the tip of the step adjusting bolt 9 and the plate 11 is increased by the distance that the tip of the step adjusting bolt 9 moves upward, or the universal joint is attached to the tip of the step adjusting bolt 9. In the plate 11 mounted so as to be rotatable via the
A gap is formed between the above and the step adjusting bolt 9 and the plate 11 by the distance moved upward.

As a result, the precast concrete member 1 is lowered by the distance of the gap due to its own weight, and the position where the tip of the step adjusting bolt 9 again contacts the plate 11 or the lower surface of the plate 11 is again the base. It stops at the position where it comes into contact with the concrete 17b. By repeating the above work, fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

Next, as shown in FIGS. 5 (f) and 7,
After the nut 7 is screwed into the anchor bolt 6 protruding into the large-diameter recessed portion 4a of the anchor bolt hole 4 and the precast concrete member 1 is firmly fixed to the foundation concrete 17b, FIGS. The grout material 18 is injected from the grout material injection hole 3 as shown in FIG. The grout material 18 injected from the grout material injection hole 3 fills the gap S between the precast concrete member 1 and the base concrete 17b.

As a result, the precast concrete member 1 is provided with the ground concrete 17b through the grout material 18.
However, the back surface of the precast concrete member 1 and the surface of the base concrete 17b are in close contact with the grout material 18, respectively. As a result, the sediment flow does not enter between the precast concrete member 1 and the base concrete 17b, and the precast concrete member 1 can be reliably prevented from peeling off from the base concrete 17b.

Here, the precast concrete member 1
Since the adhesion preventing layer 2 which does not adhere to the grout material 18 is formed on the back surface of the precast concrete member 1, the back surface of the precast concrete member 1 is in close contact with the grout material 18 but is in an edge cut state. Therefore, the precast concrete member 1 can be easily removed from the base concrete 17b if necessary even after a long period of time since the installation, and the precast concrete member 1 installed in a portion of the irrigation structure where the wear is severe. Only the one can be replaced and if the degree of wear is not too great, it can be reused for other parts.

Next, as shown in FIGS. 6 and 7, the caps 19 are placed on the step adjusting bolts 9, the anchor bolts 6, and the nuts 7, respectively, and then the surface 1a of the precast concrete member 1 is placed. When the filling material 20 having wear resistance equivalent to that of the precast concrete member 1 is filled in the recesses of the grout material injection hole 3, the anchor bolt hole 4 and the step adjusting bolt hole 5, which are opened, the precast concrete member 1, The joint material 21 such as an elastic filler is filled in the joint portion between the first and second parts, and the repair work of the worn portion of the irrigation structure is completed.

After a long time has passed since the repair,
When the surface 1a of the precast concrete member 1 is worn to the position L of the allowable wear margin, the wear detection plate 13 embedded at the position L of the allowable wear margin is exposed on the surface of the precast concrete member 1. Since this wear detection plate 13 is colored differently from the concrete color of the precast concrete member 1, it can be easily discriminated from the outside. This wear detection plate 13
It is possible to know that it is time to replace the precast concrete member 1 by exposing the precast concrete member 1 to the outside. In this case, the worn precast concrete member 1 is replaced with the ground concrete 17b in the reverse order of the construction process.
Remove from and replace with a new one.

In the above embodiment, the wear-resistant precast concrete member used for repairing the worn part of the already worn water-filled structure has been described. It goes without saying that it can be installed in civil engineering structures other than irrigation structures, such as road structures and piers, where they are susceptible to wear or in whole. Furthermore, the wear-resistant precast concrete member is designed to have a free shape and dimension according to the cross-sectional shape of the civil engineering structure that is installed under severely worn conditions, or the abraded portion of the civil engineering structure that has already been abraded. The prepared one can be used.

As a method of grouting between the base concrete and the wear-resistant precast concrete member, an injection method suitable for the situation at the site can be selected. For example, when the gap between the base concrete and the wear-resistant precast concrete member is relatively large, the grout material injection hole is not provided in the wear-resistant precast concrete member in advance, and the fluidity is excellent from the joint between the wear-resistant precast concrete members. It is also possible to inject grout material.

[0042]

Since the present invention has the above-mentioned structure,
(1) Since it is manufactured in a factory, there is no variation in quality and stable supply is possible. (2) By changing the concrete strength, various wear resistant grades can be selected according to the degree of wear, and it is possible to freely respond to the installation location. (3) It has superior durability and wear resistance as compared with cast-in-place concrete, and has improved durability and can be used for a long period of time. (4) High-strength concrete is more cost effective and economical than other materials (resin, elastic plate, steel plate).

Further, (5) the replacement time can be discriminated from the outside, and the maintenance management is easy. (6) It is economical from the viewpoint of life cycle cost because the wear-resistant precast concrete member in a portion that is heavily worn can be replaced by a simple construction method and can be reused. (7) Since no local curing is required, the construction period can be shortened and the start of use can be accelerated. (8) Further, it is possible to easily adjust the level difference when laying, and it is possible to suppress local concentration of wear and improve durability. (9) Further, there are various effects that the generation of construction waste can be suppressed by making it possible to prolong the life of the wear-resistant precast concrete member and reuse it.

[Brief description of drawings]

FIG. 1 is a plan view of a wear-resistant precast concrete member according to the present invention.

FIG. 2 is a front view of the wear resistant precast concrete member.

FIG. 3 is an enlarged partial sectional view of the wear-resistant precast concrete member.

FIG. 4 is a front view showing an installed state of wear detecting means.

FIG. 5 is an explanatory view showing a procedure for installing a wear-resistant precast concrete member on a wear part.

FIG. 6 is an enlarged cross-sectional partial explanatory view of step adjustment.

FIG. 7 is an enlarged partial cross-sectional view of a fixed portion.

FIG. 8 is an enlarged sectional partial view of a laid state.

[Explanation of symbols] 1 wear-resistant precast concrete member 1a surface 2 anti-adhesion layer 3 grout material injection hole 4 anchor bolt hole 5 step adjustment bolt hole 6 anchor bolt 9 step adjustment bolt 10 packing 11 plate 12 wear detection means 13 wear detection plate 14 Legs 15a Reinforcing bar holding part 17 Wear part 17b Base concrete 18 Grout material 19 Cap S Gap ─────────────────────────────── ───────────────────────

[Procedure amendment]

[Submission date] December 12, 2002 (2002.12.
12)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Abrasion resistant precast concrete member for civil engineering structures

[Claims]

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wear-resistant precast concrete member for civil engineering structures, and more specifically,
The present invention relates to a wear-resistant precast concrete member for civil engineering structures, which is used for repairing a site where abrasion resistance is required in a new civil engineering structure or a worn portion of an existing civil engineering structure.

[0002]

2. Description of the Related Art Civil engineering structures have the fear of being subject to severe wear depending on the natural environment conditions and artificial conditions of use. Examples of structures that are subject to wear damage due to natural factors include port structures and river structures, while examples of structures that are subject to wear damage due to human factors include road structures. Although the physical factors that cause wear of each of these civil engineering structures are different from each other, when viewed from the viewpoint of maintenance and repair, in both cases, rapid diagnosis in use and means for functional recovery are required. Absent.

For example, there are water intake weirs, erosion control dams, floor stoppers, etc. as water use structures installed for the purpose of water intake from rivers and drainage channels and river bed stabilization. The surface of the weir body and the apron part of these irrigation structures is gradually abraded by the flow of sediment, and the main causes thereof are impacts due to the flow of gravel, abrasion and cavitation. In particular, since the length of rivers in Japan is short and steep, the progress of damage to the weir body and apron surface of irrigation structures is remarkable, and there is a problem that repairs are required in a short period of time.

As a protective measure construction method for preventing the abrasion of the surface of the apron portion, (1) a method of improving the quality of concrete in the apron portion. (2) A method in which a wear resistant material is mixed into concrete in the apron. (3) There is a method of forming a wear resistant layer on the concrete surface of the apron part, but from a comprehensive perspective, the method of (1) above is suitable,
Among them, high strength concrete is desirable.

However, the above methods (1) and (2) are methods that can be mainly used only when new construction is performed, and the method (3) is suitable for existing water use structures. That is, in order to repair the apron part of an existing water use structure and form a wear resistant layer on the concrete surface of the apron part, it is optimal to adopt the method of (3) above. The construction methods A) to (E) are considered.

(A) Stone lining method: Conventionally, stone lining, Machi stone lining, Noh stone lining, etc. have been used and have excellent impact resistance and wear resistance. (B) Steel plate and cast steel plate tensioning method: A method in which a steel plate is welded and fixed to an anchor driven into a base concrete, and has excellent impact resistance and wear resistance.
(C) Epoxy resin mortar method: A method in which a mixture of epoxy resin and silica sand is directly placed on the foundation concrete and has good wear resistance.

(D) Elastic plate construction method: A polyurethane type elastic plate is fixed to the foundation concrete with anchor bolts, etc., and the elastic plate has a large impact absorbing effect and is particularly excellent in impact resistance and abrasion resistance. . (E) Resin concrete construction method: The resin concrete is directly placed on the base concrete, and it has excellent impact resistance and abrasion resistance.
It has the advantage that construction is easy without the need for heavy machinery.

[0008]

However, in the above-mentioned (A) stone-clad construction method, there is a problem of separation from cutting stones, machinite stones, field stones and ground concrete. In recent years, it has been difficult to obtain high-quality stone materials, and skilled masonry is in short supply. (B) In the steel plate and cast steel plate construction method, the steel plate and the base concrete separate from each other due to temperature stress, and the steel plate becomes wavy due to the impact of boulders and boulders, and the convex portions locally tend to wear more than expected. There is. Moreover, the welding work is not easy because the construction is not easy, and there is a step between the steel plates laid next to each other.
There is also a problem that the step portion is significantly worn due to cavitation. There are also landscape issues.

Further, the (C) epoxy resin mortar construction method has a problem in that it is peeled off from the base concrete and the mortar layer is thin, so that it is not very effective. And again
(D) The elastic plate method has a difficulty in adhesion to the base concrete, and there is a possibility that the sand flow flows into the gap between the base concrete and the elastic plate to separate the elastic plate. Further, there are problems that the construction is not easy and the construction cost is high.

Furthermore, the (E) resin concrete method is
Since it takes days to dry the base concrete and to cure the resin concrete placed on the base concrete, the resin concrete is more than 10 times the price of ordinary concrete, and the construction cost is high. In addition, the resin concrete generated during the re-repair cannot be reused, so that the economical loss is large and the industrial waste becomes a problem in its treatment.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is easy to carry out the construction and surely separates the wear-resistant precast concrete member installed in the wear portion from the wear portion. It can be prevented,
Civil engineering structures that can be easily visually discerned when to replace and prevent local wear by eliminating the occurrence of steps, especially water use structures such as intake weirs, erosion control dams, or floor stoppers. An object of the present invention is to provide a wear-resistant precast concrete member for civil engineering structures, which is equipped with a wear detecting means used for new construction or repair.

[0012]

In order to achieve the above-mentioned object, the first invention of the present application is a civil engineering structure used for repairing a civil engineering structure provided under severely worn conditions, or an existing civil engineering structure worn part. A wear-resistant precast concrete member for a structure, which has a predetermined depth from the surface of the wear-resistant precast concrete member, is embedded with wear detecting means in which a wear detecting plate having a concrete color and a different color tone is fixed to a reinforcing bar, and the wear A wear-resistant precast concrete member for civil engineering structures, characterized in that an allowable wear depth of the wear-resistant precast concrete member is displayed by a detection means. As a result, the allowable wear limit of the wear-resistant precast concrete member can be visually determined to easily know the replacement time, which facilitates maintenance management.

Since the wear-resistant precast concrete member is a precast member manufactured in a factory, it is possible to supply a stable product without quality variations. In particular, compared to cast-in-place concrete, when precast members are used, it is easier to make high-strength concrete by kneading, and it is possible to provide those with excellent durability and wear resistance. By changing the concrete strength, it is possible to select a wear-resistant grade according to the installation location. Moreover, since no on-site curing is required, the service can be started earlier and the construction period can be shortened.

According to a second aspect of the present invention, the wear detecting means has a substantially box-shaped leg protruding from the lower surface of the wear detecting plate, and the front and rear leg portions are opposed to each other. , The same left and right legs, the lower reinforcing bar embedded in the wear-resistant precast concrete member by the reinforcing bar holding portion formed at the lower end of the front and rear legs, the left and right legs Is a wear-resistant precast concrete member for civil engineering structures, characterized in that the reinforcing bar holding portion extending from the lower end to the upper part holds an upper reinforcing bar crossing the lower reinforcing bar, respectively. Thus, by selecting the leg of the desired height, the wear detection plate can be installed horizontally at the position of the allowable wear allowance of the wear-resistant precast concrete member at the intersection of the reinforcing bars, We can stably supply products with consistent quality.

The third and fourth inventions of the present application are the wear-resistant precast concrete member so that the grout material filled between the wear-resistant precast concrete member and the ground or wear portion of the civil engineering structure does not adhere. It is characterized in that it has an adhesion preventing means on its back surface. As a result, the wear-resistant precast concrete member can be detached from the worn portion of the civil engineering structure, and only the wear-resistant precast concrete member installed in the heavily worn portion can be replaced. Therefore, maintenance is easy, and if the degree of wear is not so great, it can be reused for other parts.
The anti-adhesion means is achieved by applying a paint or a resin, or by attaching an anti-adhesion sheet.

Further, a fifth invention of the present application has bolts provided at a plurality of positions of the wear-resistant precast concrete member so as to be retractable from the back surface and an inner cross-section at a position where tip portions of the bolts abut. It is provided with a step adjusting means composed of a plate mounted through a packing. By adjusting the installation height with this step adjustment means, it is possible to install without wearing a step between the connection parts of the wear-resistant precast concrete members that are laid side by side, and prevent cavitation and local wear. The durability is improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a wear-resistant precast concrete member for civil engineering structures according to the present invention (hereinafter referred to as precast concrete member). )so,
In the illustrated example, the length is 199 cm, the width is 99 cm, and the thickness is 8 c.
m is a rectangular plate-shaped body in plan view, concrete with high compressive strength mixed with silica fume, W / C
It is made of concrete with high strength by reducing (water-cement ratio) or resin concrete with high impact resistance and abrasion resistance, and its lower surface (back surface) is coated with a coating that does not adhere to the grout material described later. An anti-adhesion layer 2 having a layer or a vinyl sheet installed thereon is formed.

Further, the precast concrete member 1 has three kinds of holes penetrating from the front surface 1a to the adhesion preventing layer 2 on the back surface, that is, in order from the center of the precast concrete member 1, the grout material injection holes 3, 3. An anchor bolt hole 4 and a step adjusting bolt hole 5 are formed respectively. The grout material injection holes 3 are provided at two positions on the center line in the longitudinal direction of the precast concrete member 1 and are spaced apart from each other on the left and right, and the lower opening has a larger diameter than the upper opening so that the grout material 18 to be described later is provided. The structure is such that the back side of the precast concrete member 1 can be easily filled.

Anchor bolt holes 4 are provided at four locations outside the grout material injection hole 3, and are fastened to the anchor bolt 6 from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface. The large diameter concave portion 4a corresponding to the diameter of the nut 7 and the small diameter portion 4b corresponding to the diameter of the anchor bolt 6 are formed.

Reference numeral 5 denotes a step adjusting bolt hole, which is provided outside the anchor bolt hole 4 in the vicinity of the four corners of the precast concrete member 1. The step adjusting bolt hole 5 has a large-diameter recess 5a from the front surface 1a of the precast concrete member 1 toward the adhesion preventing layer 2 on the back surface.
And a small-diameter portion 5b, and an insert 8 having an internal thread is embedded inside the small-diameter portion 5b.

A wear detecting means 12 is composed of a wear detecting plate 13 having a color tone different from that of concrete and a nearly box-shaped leg 14 protruding from the lower surface of the wear detecting plate 13. The wear detection plate 13 is installed at a position (a position of an allowable wear allowance) L at a predetermined depth from the surface 1a of the precast concrete member 1 by fixing it to a reinforcing rebar embedded in the precast concrete member 1 by a method described later. It is configured to do.

More specifically, referring to FIG. 4, the leg 14 is composed of front and rear leg portions 15 and 15 which face each other, and left and right leg portions which face each other (not shown). Reinforcing bar holding portion 15 formed at the lower end
a, 15a, a lower reinforcing reinforcing bar X embedded in the precast concrete member 1 and an upper reinforcing reinforcing bar X intersecting with the reinforcing reinforcing bar X by a reinforcing bar holding portion extending from the lower end to the upper part of both left and right legs not shown. It is configured to hold each Y.

By selecting the leg 14 having a desired height, the wear detecting plate 13 is reinforced by the reinforcing bar X,
It is horizontally installed at the intersection L of the precast concrete members 1 at the allowable wear margin position L. This allows
When the upper surface of the precast concrete member 1 is worn to the position L of the allowable wear allowance, the wear detection plate 13 appears on the surface 1a, and it can be detected that the wear of the precast concrete member 1 has reached the limit.

Next, referring to FIG. 5, a method for repairing a worn portion of a water utilization structure using the precast concrete member 1 will be described. First, in FIG. Existing concrete 17a
Then, the base concrete 17b is formed as shown in FIG. Next, as shown in FIG. 2C, anchor bolts 6 and 6 are driven into predetermined positions of the base concrete 17b, and as shown in FIG. 2D, the precast concrete member 1 is attached to the anchor bolt holes 4 thereof.
The anchor bolts 6 are respectively inserted therein, and are laid side by side on the concrete foundation 17b.

Since the plate 11 mounted via the annular elastic packing 10 or the universal joint portion projects from the back surface of the precast concrete member 1, the precast concrete member 1 is connected to the base concrete 17b via the plate 11. Since it will be laid on top, a gap S is formed between the surface of the base concrete 17b and the back surface of the precast concrete member 1.

Further, the surface of the base concrete 17b has irregularities, and in many cases a step is formed between the precast concrete members 1 and 1 laid side by side thereon. Since this step causes a large amount of wear due to cavitation of the water flow, it is necessary to lay it so as not to generate a step between the adjacent precast concrete members 1 and 1. In order to prevent such a step from occurring, FIG.
The height of the precast concrete members 1 is adjusted by the step adjusting means shown in, and fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

More specifically, in FIG. 6, reference numeral 9 is a step adjusting bolt screwed into the insert 8 of the step adjusting bolt hole 5 so that the tip of the step adjusting bolt can be projected and retracted from the back surface of the precast concrete member 1. Is configured,
A plate 11 mounted on the back surface of the precast concrete member 1 through an elastic packing 10 having an inner cross section.
Is installed at a position where the tip of the step adjusting bolt 9 abuts. Here, examples of the shape of the elastic packing 10 having the inner cross section include an annular shape, a quadrangular shape,
Hexagonal shape and the like can be mentioned.

Therefore, when the height of the precast concrete member 1 is adjusted, for example, when the precast concrete member 1 is lowered from the state shown by the solid line in FIG. 6 to the state shown by the chain line, the step adjusting bolt 9 is rotated counterclockwise to its tip. Are moved inward of the precast concrete member 1. As a result, a gap is formed between the tip of the step adjusting bolt 9 and the plate 11 by the distance that the tip of the step adjusting bolt 9 moves upward.

Then, the precast concrete member 1 descends by the distance of the gap due to its own weight, and stops at the position where the tip of the step adjusting bolt 9 again contacts the plate 11. By repeating the above work, fine adjustment is performed so that there is no step between the precast concrete members 1 and 1 laid side by side.

Next, as shown in FIGS. 5 (f) and 7,
After the nut 7 is screwed into the anchor bolt 6 protruding into the large-diameter recessed portion 4a of the anchor bolt hole 4 and the precast concrete member 1 is firmly fixed to the foundation concrete 17b, FIGS. The grout material 18 is injected from the grout material injection hole 3 as shown in FIG. The grout material 18 injected from the grout material injection hole 3 fills the gap S between the precast concrete member 1 and the base concrete 17b.

As a result, the precast concrete member 1 is provided with the ground concrete 17b through the grout material 18.
However, the back surface of the precast concrete member 1 and the surface of the base concrete 17b are in close contact with the grout material 18, respectively. As a result, the sediment flow does not enter between the precast concrete member 1 and the base concrete 17b, and the precast concrete member 1 can be reliably prevented from peeling off from the base concrete 17b.

Here, the precast concrete member 1
Since the adhesion preventing layer 2 which does not adhere to the grout material 18 is formed on the back surface of the precast concrete member 1, the back surface of the precast concrete member 1 is in close contact with the grout material 18 but is in an edge cut state. Therefore, the precast concrete member 1 can be easily removed from the base concrete 17b if necessary even after a long period of time since the installation, and the precast concrete member 1 installed in a portion of the irrigation structure where the wear is severe. Only the one can be replaced and if the degree of wear is not too great, it can be reused for other parts.

Next, as shown in FIGS. 6 and 7, after the caps 19 are placed on the step adjusting bolts 9, the anchor bolts 6, and the nuts 7, the surface 1a of the precast concrete member 1 is placed. When the filling material 20 having the same wear resistance as that of the precast concrete member 1 is filled in the recesses of the grout material injection hole 3, the anchor bolt hole 4 and the step adjusting bolt hole 5, which are opened, the precast concrete member 1, The joint material 21 such as an elastic filler is filled in the joint portion between the first and second parts, and the repair work of the worn portion of the irrigation structure is completed.

After a long period of time has passed since the repair,
When the surface 1a of the precast concrete member 1 is worn to the position L of the allowable wear margin, the wear detection plate 13 embedded at the position L of the allowable wear margin is exposed on the surface of the precast concrete member 1. Since this wear detection plate 13 is colored differently from the concrete color of the precast concrete member 1, it can be easily discriminated from the outside. This wear detection plate 13
It is possible to know that it is time to replace the precast concrete member 1 by exposing the precast concrete member 1 to the outside. In this case, the worn precast concrete member 1 is replaced with the ground concrete 17b in the reverse order of the construction process.
Remove from and replace with a new one.

In the above embodiment, the wear-resistant precast concrete member used for repairing a worn portion of an already worn water-filled structure has been described. It goes without saying that it can be installed in civil engineering structures other than irrigation structures, such as road structures and piers, where they are susceptible to wear or in whole. Furthermore, the wear-resistant precast concrete member is designed to have a free shape and dimension according to the cross-sectional shape of the civil engineering structure that is installed under severely worn conditions, or the abraded portion of the civil engineering structure that has already been abraded. The prepared one can be used.

As the method of grouting between the base concrete and the wear-resistant precast concrete member, an injection method suitable for the situation at the site can be selected. For example, when the gap between the base concrete and the wear-resistant precast concrete member is relatively large, the grout material injection hole is not provided in the wear-resistant precast concrete member in advance, and the fluidity from the joint between the wear-resistant precast concrete members is excellent. It is also possible to inject grout material.

[0037]

Since the present invention has the above-mentioned structure,
(1) Since it is manufactured in a factory, there is no variation in quality and stable supply is possible. (2) By changing the concrete strength, various wear resistant grades can be selected according to the degree of wear, and it is possible to freely respond to the installation location. (3) It has superior durability and wear resistance as compared with cast-in-place concrete, and has improved durability and can be used for a long period of time. (4) High-strength concrete is more cost effective and economical than other materials (resin, elastic plate, steel plate).

Further, (5) the replacement time can be discriminated from the outside, and the maintenance management is easy. (6) It is economical from the viewpoint of life cycle cost because the wear-resistant precast concrete member in a portion that is heavily worn can be replaced by a simple construction method and can be reused. (7) Since no local curing is required, the construction period can be shortened and the start of use can be accelerated. (8) Further, it is possible to easily adjust the level difference when laying, and it is possible to suppress local concentration of wear and improve durability. (9) Further, there are various effects that the generation of construction waste can be suppressed by making it possible to prolong the life of the wear-resistant precast concrete member and reuse it.

[Brief description of drawings]

FIG. 1 is a plan view of a wear-resistant precast concrete member according to the present invention.

FIG. 2 is a front view of the wear resistant precast concrete member.

FIG. 3 is an enlarged partial sectional view of the wear-resistant precast concrete member.

FIG. 4 is a front view showing an installed state of wear detecting means.

FIG. 5 is an explanatory view showing a procedure for installing a wear-resistant precast concrete member on a wear part.

FIG. 6 is an enlarged cross-sectional partial explanatory view of step adjustment.

FIG. 7 is an enlarged partial cross-sectional view of a fixed portion.

FIG. 8 is an enlarged sectional partial view of a laid state.

[Explanation of symbols] 1 Wear-resistant precast concrete members 1a surface 2 Adhesion prevention layer 3 Grout material injection hole 4 anchor bolt holes 5 Step adjustment bolt hole 6 anchor bolts 9 Step adjustment bolt 10 packing 11 plates 12 Wear detection means 13 Wear detection plate 14 legs 15a Reinforcing bar holding part 17 Worn part 17b Base concrete 18 grout 19 cap S gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Sato             Maeda Pipeline 6-7 Uehonmachi, Sakata City, Yamagata Prefecture             Inside the company (72) Inventor Yutaka Nakamura             Maeda Pipeline 6-7 Uehonmachi, Sakata City, Yamagata Prefecture             Inside the company (72) Inventor Hiroshi Takahashi             Shareholders, 10-19 Okaji, Miyagino-ku, Sendai City, Miyagi Prefecture             Company New Toyo Technical Consultant (72) Inventor Junkichi Shimojo             Shareholders, 10-19 Okaji, Miyagino-ku, Sendai City, Miyagi Prefecture             Company New Toyo Technical Consultant (72) Inventor Norihiro Majima             Shareholders, 10-19 Okaji, Miyagino-ku, Sendai City, Miyagi Prefecture             Company New Toyo Technical Consultant F-term (reference) 4G052 AB26 AB42

Claims (10)

[Claims] 1. A wear-resistant precast concrete member used for repairing a civil engineering structure provided under conditions of severe wear or an existing worn part of a civil engineering structure, wherein the wear-resistant precast concrete member has an allowable wear depth. A wear-resistant precast concrete member for civil engineering structures, characterized by comprising wear detection means for displaying the degree of wear. 2. The civil engineering structure according to claim 1, wherein the wear detecting means is a wear detecting plate having a color tone different from the color of concrete embedded at a predetermined depth from the surface of the wear-resistant precast concrete member. Abrasion resistant precast concrete member for objects. 3. The wear detecting means is characterized in that the wear-resistant precast concrete member has a two-layer structure of an upper layer and a lower layer, and the lower layer has a color tone different from that of the upper layer. Wear-resistant precast concrete members for civil engineering structures. 4. An adhesion preventing means is provided on the back surface of the wear-resistant precast concrete member so that the grout material filled between the wear-resistant precast concrete member and the ground or wear portion of the civil engineering structure does not adhere to each other. The wear-resistant precast concrete member for civil engineering structures according to any one of claims 1 to 3, characterized in that. 5. The wear-resistant precast concrete member for civil engineering structures according to claim 4, wherein the adhesion preventing means is a paint layer or a resin layer. 6. The wear-resistant precast concrete member for civil engineering structures according to claim 1, further comprising step adjusting means provided at a plurality of locations on the wear-resistant precast concrete member. 7. The step adjusting means is mounted through a bolt provided so as to be retractable from the back surface of the wear-resistant precast concrete member, and a packing having an inner cross section at a position where a tip end portion of the bolt comes into contact. The wear-resistant precast concrete member for civil engineering structures according to claim 6, wherein the wear-resistant precast concrete member comprises a plate. 8. The step adjusting means comprises a bolt provided so as to be retractable from the back surface of the wear-resistant precast concrete member, and a plate attached to the tip of the bolt through a universal joint. The wear-resistant precast concrete member for civil engineering structures according to claim 6. 9. The wear resistant precast concrete member according to claim 1, wherein a grout material injection hole penetrating from the front surface to the back surface is formed in the wear resistant precast concrete member. Wear precast concrete member. 10. The wear-resistant precast concrete member has a multi-layer structure of a layer containing reinforcing fibers and a layer not containing reinforcing fibers, according to any one of claims 1 to 9. Abrasion resistant precast concrete member for civil engineering structures as described.