JP2017053208A - Reinforcement material for construction and civil engineering, concrete structure using the same, concrete floor slab structure, construction method and reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement material for construction and civil engineering superior in fixability in a structure to reinforce a concrete structure with reinforcing bar embedded.SOLUTION: A reinforcement material 1 constituted of a reinforcement material body 2 formed of CFRP (carbon fiber reinforced resin material); and a GFRP tube 4 laid on outer periphery thereof being fixed to the reinforcement material body 2 with fixing agent 5. The reinforcement material 1 has a plurality of projections 3 integrated with the outer periphery thereof.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing material made of fiber reinforced resin (hereinafter also referred to as “FRP”) embedded in a structure in order to reinforce a building civil engineering structure, and a concrete floor slab structure formed using the same. And its construction method and reinforcement method.

  According to the large-scale renewal and repair plan for the expressway that was announced in Japan, a large amount of budget is allocated to the replacement of the floor slabs and repair work on the bridge. There are many places where it is difficult to replace the floor slabs depending on the construction conditions such as the traffic regulation period. In those places, the floor slabs are renovated from the top.

  As a method for reinforcing from the upper surface of the floor slab, for example, there is known a method of increasing the thickness of the upper surface in which steel fiber concrete is placed on the upper surface of the floor slab and old and new concrete are integrated to reinforce by increasing the thickness of the floor slab. In addition, the surface of the existing floor slab is suspended at a depth where the rebar is not exposed, and the suspended portion is treated by applying a primer and laying resin mortar on it, and then reinforcing bars made of FRP. There is known an FRP reinforcing method in which a material is placed in a hanging part, and then a resin mortar is placed to restore the surface layer part of the floor slab (see, for example, Patent Document 1).

JP 2003-176508 A

In order to ensure the fillability of the additional reinforcing bars, the above-mentioned thickening method on the top surface increases the thickness by about 10 cm and requires a certain level of concrete thickness, which increases the floor slab thickness, thereby increasing the dead load. There is a problem that the burden on the existing housing will increase. Since the road surface height also changes, it becomes necessary to review the alignment including the telescopic device.
On the other hand, the FRP reinforcing method has a problem that it is difficult to shorten the construction period because it uses an immediately curable resin mortar, but has a large number of processes and needs to secure a curing time in each process.
Highway bridges that need to be renewed and repaired at an early stage can extend to several hundred kilometers in total length, so the work to reinforce and reinforce the floor slab can be done in a short traffic regulation period with a reduced weight increase. There is a demand for reliable and prompt construction, and the development of a new construction method that achieves this is demanded.

  In view of such problems of the prior art, the present invention has developed a building material for building civil engineering that has excellent fixability inside the structure when reinforcing and repairing a concrete structure in which a reinforcing bar is embedded. Therefore, it is an object of the present invention to be able to reinforce and repair floor slabs such as bridges on highways in a short construction period while suppressing an increase in weight.

  In the conventional FRP reinforcement method, a resin mortar layer as an undercoat is formed on a floor slab, an FRP reinforcing bar material is installed on the upper surface, and then a resin mortar is further placed to fill the reinforcing bar. Since it is restored, the curing time for the entire construction becomes longer, and it is difficult to shorten the construction period. When a fast-curing mortar is used instead of the resin mortar, the reinforcing reinforcing material made of FRP has a low adhesive force with concrete or the like and does not have a high fixability, so that a sufficient reinforcing effect cannot be obtained as it is.

  Therefore, the present invention is configured by providing a plurality of fixing parts on the outer periphery of the FRP-made reinforcing material, thereby improving the adhesion with a structural material such as concrete and ensuring that the reinforcing material is integrated with the structural material. The concrete structure can be effectively reinforced.

  That is, the building construction reinforcing material of the present invention is provided with a plurality of protrusions formed by passing a tube made of FRP around the outer periphery of the muscle material main body made of FRP and fixing it to the muscle material main body with a fixing agent. It is characterized by having a structure.

In the above-structured muscle material, the muscle material body is a rod made of either a carbon fiber reinforced resin material (hereinafter also referred to as “CFRP”) or an aramid fiber reinforced resin material (hereinafter also referred to as “AFRP”), preferably. Can be formed by a highly elastic CFRP rod.
Further, the tubular body constituting the protrusion can be formed of any one of glass fiber reinforced resin material (hereinafter also referred to as “GFRP”), CFRP, and AFRP.
An epoxy resin filler or an expanded cement can be used as a fixing agent for fixing the pipe body to the muscle material body.

The reinforcing material having the above-described structure is characterized in that the outer diameter (S) of the tubular body and the diameter (φ) of the reinforcing material body satisfy the following relational expression.
(Relation) φ + 6mm ≦ S ≦ φ + 35mm
Further, the present invention is characterized in that the inner diameter (T) of the tubular body and the diameter (φ) of the muscle material body satisfy the following relational expression.
(Relation) φ + 2mm ≦ T ≦ φ + 10mm

Furthermore, the length of the tubular body is 30 to 70 mm in the above-structured reinforcing material.
Moreover, the thickness of a tubular body is 1-8 mm, It is characterized by the above-mentioned.
Furthermore, the interval between adjacent tubular bodies is 100 to 1500 mm.
In the above-structured reinforcing material, the content of the fibrous reinforcing material in the fiber-reinforced resin material is 30 to 80% by volume.

  The building construction reinforcing material of the present invention comprises a reinforcing material main body formed in an appropriate diameter and length, and a plurality of tubes having an appropriate length formed in a cylindrical shape with an inner diameter fitting on the outer periphery of the reinforcing material main body. Prepare and pass the pipe body around the outer periphery of the muscle material body, and fill the space between the outer periphery surface of the muscle material body and the inner peripheral surface of the tube body at a predetermined interval between the adjacent tube bodies. Thus, each tubular body is formed by fixing each tubular body to the muscle material main body, and each tubular body fixed to the muscle material main body becomes a large-diameter protruding portion protruding outward from the outer periphery of the muscle material main body.

The construction civil engineering reinforcement of the present invention configured as described above can be used as a means for reinforcing a concrete structure by embedding it in a structural material when a concrete structure is formed.
Further, when a concrete floor slab structure is formed, it can be used as means for reinforcing the floor slab by being embedded in the concrete floor slab.
In addition, the building construction reinforcement of the present invention can be used as a reinforcement for embedding in a structural material and reinforcing in various concrete structures such as buildings, roads, bridges, waterways, and dikes. .

Further, the present invention is a method for constructing a concrete floor slab structure in which an asphalt pavement is provided on a concrete floor slab,
A step of installing a plurality of building civil engineering struts of the above configuration on a concrete floor slab;
Placing a fast-curing mortar on a concrete floor slab in which the building construction reinforcement is installed;
And laying an asphalt pavement on the fast-curing mortar.

Furthermore, the present invention provides a method for reinforcing an existing concrete floor slab structure in which an asphalt pavement is provided on a concrete floor slab,
Removing the asphalt pavement;
A step of installing a plurality of building civil engineering struts of the above configuration on a concrete floor slab;
Placing a fast-curing mortar on a concrete floor slab in which the building construction reinforcement is installed;
And laying an asphalt pavement on the fast-curing mortar.

Further, the present invention provides a method for reinforcing an existing concrete floor slab structure,
Cutting the upper surface portion of the existing concrete floor slab to a depth at which the reinforcing bars arranged therein are exposed;
A step of installing a plurality of the structural civil engineering struts on the upper surface of the excised portion;
And a step of placing a fast-curing mortar on the concrete floor slab on which the building construction reinforcement is installed.

In the construction method and the reinforcing method, the concrete slab is reinforced concrete in which reinforcing bars are disposed, and the building construction reinforcing material of the present invention is installed on the top or after the upper part is cut off, and the fast-curing mortar is applied. As a result, a concrete floor slab structure integrated with the lower concrete floor slab is formed. The asphalt pavement is laid on it.
According to this, the building civil engineering reinforcements embedded in the structural material are provided in a shape in which a plurality of protrusions are integrated at an appropriate interval along the outer periphery of the FRP muscular body. Therefore, peeling stress is unlikely to occur at the interface with fast-curing mortar, and the reinforcing material is firmly attached to the mortar with high adhesion, and even if the concrete floor slab is pulled or bent, it is difficult to pull out the reinforcing material. The concrete slab can be effectively reinforced by improving physical properties such as impact resistance, bending strength, and wear resistance. Since the streaks are provided in a shape that exhibits high adhesion to concrete, it is possible to construct and reinforce the concrete slab structure in a short period of time using fast-curing mortar and concrete.
In addition, the reinforcing material made of FRP is excellent in corrosion resistance, and a reinforcing material made of high elastic CFRP whose Young's modulus is more than twice that of iron has a high stress relaxation effect of the reinforcing steel and increases the strength of the concrete slab. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the building-use civil engineering reinforcement material of one Embodiment of this invention. FIG. 2 is a partial cross-sectional view of the building civil engineering reinforcement of FIG. 1. It is a schematic sectional drawing of the road bridge which reinforces a floor slab using the building-use civil engineering reinforcement of this invention. (A)-(D) is a figure for demonstrating the process to reinforce which expanded and showed the A section in FIG. It is the figure which showed the structure of the measurement system of the tension test in an Example.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, the form of the illustrated structural civil engineering reinforcement or the form of the structure strengthened using the same does not limit the present invention.

FIG. 1 shows an external appearance of a building civil engineering strut (hereinafter also simply referred to as “strut”) according to an embodiment of the present invention, and FIG.
The illustrated muscle 1 is made of FRP having an appropriate diameter (φ) and length, preferably FRP, preferably GFRP, CFRP, or the like on the outer periphery of a highly elastic CFRP or AFRP muscle body 2. A plurality of protrusions 3 are formed integrally through a tube 4 made of AFRP, more preferably GFRP, and fixed to the muscle material body 2 by a fixing agent 5.

  Specifically, the muscle material body 2 is formed to have an appropriate diameter (φ) and length, and the outer periphery thereof is appropriately formed in a cylindrical shape with an inner diameter (T) slightly larger than the diameter (φ) of the muscle material body 2. The fixing agent between the outer peripheral surface of the muscle material main body 2 and the inner peripheral surface of the tubular body 4 at a position where a predetermined interval is passed between the adjacent tubular bodies 4, 4. 5, each tube 4 is fixed to the muscle main body 2, and the large diameter projecting outward from the outer periphery of the muscle main body 2 by each tube 4 fixed to the muscle main body 2. The reinforcing material 1 can be formed by integrating the protruding portions 3.

  The tubular body 4 is preferably manufactured in advance. For example, a fibrous filler such as roving-like glass fiber is impregnated with a resin component such as an epoxy resin and wound around a core material to a desired thickness. Thereafter, the tubular body 4 can be obtained by curing the resin component and extracting the core material.

  The content of the fibrous reinforcing material such as carbon fiber, glass fiber, and aramid fiber contained in the fiber reinforced resin material constituting the tubular body 4 is preferably 30 to 80% by volume in the fiber reinforced resin material. More preferably, it is -75 volume%, and it is further more preferable that it is 50-70 volume%.

As the fixing agent 5 for fixing the tubular body 4 to the outer periphery of the muscle material main body 2, a thermosetting resin, a thermoplastic resin, a moisture curable resin, mortar, cement, or the like can be used.
Examples of the thermosetting resin include phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, urethane resin, alkyd resin, and polyimide resin.

  Examples of the thermoplastic resin include olefin resins such as polyethylene, polypropylene and cyclic polyolefin, polyester resins such as polybutylene terephthalate and polyethylene terephthalate, styrene resins such as polystyrene, ABS resin and AS resin, polyvinyl chloride, and polyacetic acid. Vinyl, acrylic resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether, polyphenylene sulfide (PPS), polysulfone, polyether sulfone, amorphous polyarylate, liquid crystal polymer, polyether ether ketone (PEEK), urethane resin Etc.

Examples of the moisture curable resin include urethane resins and modified silicone resins that are resins in which isocyanate groups are generated by moisture.
Examples of the mortar include expanded mortar, lightweight mortar, refractory mortar and the like.
As the cement, ordinary Portland cement mainly composed of calcium silicate, calcium aluminate, calcium sulfate, calcium oxide, etc. , Ultrafast cement, silica cement, fly ash cement, aluminum cement, expanded cement, sulfate resistant cement, blast furnace colloid cement, colloid cement and the like.
Cement is used together with water and known cement admixtures as necessary, for example, shrinkage compensation materials, cure acceleration ratios, cure retarders, dispersants, air entrainers, thickeners, water reducing agents, fillers, etc. be able to.
Among these, from the viewpoint of the degree of adhesion stress with an object to be fixed such as concrete, an epoxy resin filler such as an epoxy resin or cement is preferable, and expanded cement is more preferable.

  The formation conditions of the reinforcing material 1 such as the diameter and length of the reinforcing material body 2, the length of the tubular body 4, the number integrated into the reinforcing material body 2, and the arrangement interval are appropriately determined according to the construction site to be reinforced using this. Can be set to

In order to obtain a sufficient reinforcing effect, the following formation conditions are preferably set.
That is, the muscle body 2 is preferably set to have a diameter (φ) of 5 to 20 mm, and more preferably 7 to 15 mm.

  In addition, the inner diameter (T) of the tube body 4 is set larger than the diameter (φ) of the muscle material body 2, but is set in the range of (φ + 2 mm ≦ T ≦ φ + 10 mm) in relation to the diameter (φ). It is preferable that it is set to (φ + 4 mm ≦ T ≦ φ + 8 mm).

  The outer diameter (S) of the tubular body 4 is also set to be larger than the diameter (φ) of the muscle material body 2, but in relation to the diameter (φ), it is set in the range of (φ + 6 mm ≦ S ≦ φ + 35 mm). More preferably, (φ + 8 mm ≦ S ≦ φ + 30 mm), and even more preferably (φ + 10 mm ≦ S ≦ φ + 20 mm) can be set.

  The thickness of the tube body 4 is preferably set to 1 to 8 mm, more preferably 1.5 to 5 mm, and still more preferably 2 to 4 mm.

  The length of the tubular body 4 is preferably set to 10 to 80 mm, more preferably 30 to 70 mm, and still more preferably 40 to 60 mm. When the length is less than 30 mm, the tube body 4 is easily pulled out from the muscle material body 2, and when the length exceeds 70 mm, the fast-curing mortar or the like placed on the concrete slab including the muscle material 1 is split. Since it may cause destruction, it is not preferable.

  Moreover, it is preferable that the space | interval of adjacent tubular bodies 4 and 4 is set to 100-1500 mm, More preferably, it can set to 150-1000 mm, More preferably, it can be set to 200-500 mm. When the interval between the adjacent tubular bodies 4 and 4 is smaller than 100 mm, filling of the fast-curing mortar between the adjacent tubular bodies 4 may be insufficient, while when the interval exceeds 1000 mm, Since stress tends to concentrate on one tube body 4 and the streaks 1 may break, it is not preferable. In addition, the space | interval of adjacent tube bodies 4 and 4 means the distance of the edge part of one tube body 4 among the some tube bodies 4, and the edge part of the other tube body 4 adjacent to this.

  In addition, in said preferable setting range, when a porosity, an internal diameter and an outer diameter, length, a space | interval, etc. differ with measurement locations, those average values are employ | adopted.

  In the present invention, by providing a plurality of such pipe bodies 4 in the FRP muscle main body 2, the tensile force applied to the pipe body 4 is dispersed, and the muscle main body 2 breaks or comes off the pipe body 4. Therefore, the concrete main body 2 and the pipe body 4 can be reliably integrated to effectively reinforce the concrete structure.

  For example, when used for reinforcement work for a floor slab of a highway bridge, which will be described later, a plurality of GFRP tubes 4 having an inner diameter of 18 mm and a length of 50 mm are passed through the outer periphery of a CFRP-made muscle material body 2 having a diameter of 12 mm, It is possible to use the reinforcing material 1 constituted by adhering each tubular member 4 to the reinforcing material main body 2 with the fixing agent 5 at a position where the adjacent tubular members 4 and 4 are spaced apart by about 30 mm.

  The rebar 1 constructed as described above is embedded in a concrete structure in the following manner at the time of renovation work for reinforcing a concrete floor slab 6 in a highway bridge as shown in FIG. The concrete slab 6 can be reinforced.

  As shown in FIG. 4 (A), the concrete floor slab 6 to be repaired is a concrete structure in which reinforcing bars 7 are arranged, and in the repair work for reinforcing this, first, FIG. 4 (B). As shown in Fig. 2, the surface of the concrete slab 6 is cut to a depth at which the reinforcing bars 7 arranged on the upper side are exposed. If an asphalt pavement (not shown) is laid on the upper surface of the concrete slab 6, this is removed. In addition, the process of the part which excised the upper part of the concrete floor slab 6 is performed suitably.

  Next, as shown in FIG. 2C, a plurality of parallel pieces are installed on the upper surface of the portion where the muscle material 1 shown in FIG. At this time, the reinforcing material 1 is arranged so as to face the direction perpendicular to the bridge axis direction of the bridge body 8 that supports the concrete floor slab 6.

  Then, as shown in FIG. 4D, the fast-curing mortar 9 is placed and cured on the excised portion where the muscle material 1 is installed so as to have substantially the same thickness as before the excision. The renovation work is completed. When an asphalt pavement is laid on the upper surface of the concrete slab 6, the mortar 9 is cured, and then the asphalt pavement is laid and the construction is completed.

  According to this, since the muscle material 1 is provided in a shape in which a plurality of protrusions 3 are integrated at an appropriate interval along the outer periphery of the muscular body main body 2 made of FRP, the muscle material 1 is high. Adherently integrated into the mortar 9, and even if the concrete floor slab 6 is pulled or bent, it is difficult for the strut 1 to be pulled out, improving the physical properties such as impact resistance, bending strength and wear resistance of the structural material. The concrete floor slab 1 can be effectively reinforced. It is possible to reinforce the concrete slab 6 in a short construction period without increasing its thickness by placing a fast-curing mortar 9 in the excised part of the upper part of the concrete slab 6 and backfilling the reinforcing material 1. Is possible.

  Next, an example in which the reinforcing material 1 of the present invention is embedded in a concrete structure and tested for adhesion performance will be described.

[Experiment 1]
Example 1
A GFRP tube 4 (glass fiber content) having an inner diameter (T) of 18 mm, a length of 50 mm, an outer diameter (S) of 24 mm, and a thickness of 3 mm on the outer periphery of a highly elastic CFRP muscle material body 2 having a diameter (φ) of 12 mm. 65.6% by volume), and this was fixed using an epoxy resin filler as the fixing agent 5 to form the reinforcing material 1 in which one protrusion 3 was integrated on the outer periphery of the reinforcing material body 2. The fixing length (L) of the tube body 4 was 110 mm (see FIG. 5).

(Example 2)
A streak 1 was formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5.

(Comparative Example 1)
A 13 mm diameter reinforcing bar (D13) was used as the reinforcing material.

(Comparative Example 2)
A rod made of highly elastic CFRP having a diameter of 12 mm was used as the muscle material.

Three pieces of each of the examples and comparative examples are manufactured, and after placing them on the mold so as to be the test body shown in FIG. 5, the concrete is poured into the mold, and the bars are embedded integrally. A concrete block test body having a size of 100 mm × 100 mm in length and width of 160 mm and a pore having a diameter of 20 mm and a length of 50 mm in the center of the lower part was formed. The strength of the concrete block is 21 N / mm ² .
The steel sleeve is fixed to the end of the strip exposed from the concrete block of each specimen, and the steel sleeve is pulled downward while supporting the specimen with the steel sleeve facing downward. The maximum tensile strength (Pmax) at the time of releasing from was measured.
The degree of adhesion stress was derived from the measured maximum tensile strength, and the average value of each example and comparative example was determined. The results are shown in Table 1.

According to the measurement result of Experiment 1, the degree of adhesion stress of the reinforcing material to the concrete block is substantially the same as that of Comparative Example 1 in Example 1, and Example 2 in which expanded cement is used as the fixing agent 5 of the tubular body 4. Then, it has confirmed that the high adhesiveness exceeding the comparative example 1 was acquired.
In Examples 1 and 2, since reinforcing bars are not used, there is no fear of corrosion such as rust caused by moisture contained in the cement even after the repair.

[Experiment 2]
(Example 3)
The streaks 1 were formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5 and the length of the tubular body 4 was set to 30 mm.

Example 4
A streak 1 was formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5.

(Example 5)
The streaks 1 were formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5 and the length of the tubular body 4 was set to 70 mm.

Three pieces of the reinforcing material of each example were produced, and in the same manner as in Experiment 1, the vertical and horizontal dimensions of 100 mm × 100 mm, height 140 mm (Example 3), 160 mm (Example 4), A concrete block test body having a size of 180 mm (Example 5) and having pores having a diameter of 20 mm and a length of 50 mm at the center of the lower part was formed. The fixing length (L) of the tube body 4 was 90 mm in Example 3, 110 mm in Example 4, and 130 mm in Example 5. The strength of the concrete block is 29 N / mm ² .
The steel sleeve is fixed to the end of the strip exposed from the concrete block of each specimen, and the steel sleeve is pulled downward while supporting the specimen with the steel sleeve facing downward. The maximum tensile strength (Pmax) at the time of releasing from was measured.
The degree of adhesion stress was derived from the measured maximum tensile strength, and the average value of each example and comparative example was determined. The results are shown in Table 2.

  According to the measurement result of Experiment 2 in which the length of the tubular body 4 is changed, the degree of adhesion stress of the reinforcing material to the concrete block is that Example 4 in which the length of the tubular body 4 is 50 mm is that of Example 3 respectively. It was confirmed that the length was higher than that when the length was set to 30 mm and the length of Example 5 was set to 70 mm.

DESCRIPTION OF SYMBOLS 1 Reinforcement material, 2 Reinforcement material main body, 3 Projection part, 4 Pipe body, 5 Fixing agent, 6 Concrete floor slab, 7 Reinforcement, 8 Bridge body, 9 Mortar

Claims (15)

  A configuration in which a pipe body made of a fiber reinforced resin material is passed through the outer periphery of a muscle material body made of a fiber reinforced resin material (FRP) and a plurality of protrusions are fixed to the muscle material body with a fixing agent. A building construction building material characterized by having.   The reinforcing material for building civil engineering according to claim 1, wherein the reinforcing material body is formed of any one of a carbon fiber reinforced resin material (CFRP) and an aramid fiber reinforced resin material (AFRP).   The tube body is formed of any one of a glass fiber reinforced resin material (GFRP), a carbon fiber reinforced resin material (CFRP), and an aramid fiber reinforced resin material (AFRP). Building construction materials.   The building material and building material according to any one of claims 1 to 3, wherein the fixing agent is an epoxy resin filler or an expanded cement. 5. The building construction building material according to claim 1, wherein the outer diameter (S) of the tubular body and the diameter (φ) of the muscle material main body satisfy the following relational expression.
(Relation) φ + 6mm ≦ S ≦ φ + 35mm 6. The building construction reinforcement according to claim 1, wherein the inner diameter (T) of the tubular body and the diameter (φ) of the reinforcement main body satisfy the following relational expression.
(Relation) φ + 2mm ≦ T ≦ φ + 10mm   The length of a tubular body is 30 to 70 mm, and the civil engineering reinforcement for construction according to any one of claims 1 to 6.   The construction civil engineering material according to any one of claims 1 to 7, wherein the thickness of the tubular body is 1 to 8 mm.   The strut for architectural civil engineering according to any one of claims 1 to 8, wherein an interval between adjacent tubular bodies is 100 to 1500 mm.   Content of the fibrous reinforcing material in a fiber reinforced resin material is 30-80 volume%, The building civil engineering reinforcement material in any one of Claim 1 to 9 characterized by the above-mentioned.   A concrete structure formed using the building civil engineering reinforcement material according to any one of claims 1 to 10.   A concrete floor slab structure formed by using the building civil engineering reinforcement material according to any one of claims 1 to 10. In the construction method of a concrete floor slab structure in which an asphalt pavement is provided on the concrete floor slab,
A step of installing a plurality of building civil engineering struts according to claim 1 on a concrete slab;
Placing a fast-curing mortar on a concrete floor slab in which the building construction reinforcement is installed;
Laying an asphalt pavement on the fast-curing mortar, and a concrete floor slab structure construction method. In a method for reinforcing an existing concrete slab structure in which an asphalt pavement is provided on a concrete slab,
Removing the asphalt pavement;
A step of installing a plurality of building civil engineering struts according to claim 1 on a concrete slab;
Placing a fast-curing mortar on a concrete floor slab in which the building construction reinforcement is installed;
Laying an asphalt pavement on the fast-curing mortar, and a method for reinforcing a concrete floor slab structure. In a method of reinforcing an existing concrete floor slab structure,
Cutting the upper surface portion of the existing concrete floor slab to a depth at which the reinforcing bars arranged therein are exposed;
A step of installing a plurality of building civil engineering struts according to any one of claims 1 to 10 on an upper surface of the excised portion;
And a step of placing a fast-curing mortar on the concrete floor slab on which the building construction reinforcement is installed, and a method for reinforcing a concrete floor slab structure.

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