JP3523603B2 - Renovation method for existing floor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention repairs an existing floor by removing the surface layer of the existing floor formed of a solidifying material such as concrete or mortar and forming a new surface layer on the removed portion. The present invention relates to a method for repairing an existing floor and a method for removing a surface layer of an existing floor, which is suitable for this method.

[0002]

2. Description of the Related Art Recently, aging has become a serious problem particularly in floors formed of solidifying materials such as concrete and mortar (hereinafter also simply referred to as floors), particularly in concrete floors of industrial plants. . Generally, the degree of deterioration of a floor can be determined by using the shape and density of cracks as an index.

The process of aging the floor is as follows, based on the normal crack progressing process. That is, a one-way crack occurs due to the drying shrinkage of the floor material (concrete) and the external force applied by a traveling vehicle such as a forklift or a truck. This is the initial stage. Next, the one-way crack grows and the crack density increases. This is the middle stage. Next, in the later stage, cracks penetrate the floor slab, that is, so-called through cracks occur, and water leakage and free lime occur. Then, in the final stage, the floor slab is collapsed and destroyed by the permeated water or the like at the through crack portion.

Although the cause of cracks cannot be generally stated, in factories where vehicles such as forklifts run, bending shear stress and torsional shear stress applied to the floor by the wheels of this vehicle are one of the main factors. It is considered to be one. For example, when the bending strength applied to the floor by the front wheels in a 2.5 ton forklift (air tire) is evaluated, it is about 2.04 MPa.
The general design standard compressive strength of industrial floors in Japan is 18MP
Since the bending strength is a, and the bending strength is usually 1/5 to 1/8 of the compressive strength, for example, when it is set to 1/8, the bending strength of a general industrial floor becomes 2.25 MPa. From the above, the safety factor is 2.25 / 2.04 = 1.10. As described above, it is understood that the general industrial floor of Japan has a remarkably low safety factor in the first place and cannot withstand running of vehicles such as forklifts for a long time.

Needless to say, the deterioration of the floor progresses without stopping until it collapses, and it is necessary to repair the deteriorated floor to some extent for safety. Therefore, conventionally, the existing floor has been refurbished by a method of removing the refurbished portion by cutting or the like and splicing a solidifying material such as concrete to the removed portion, or by completely remaking the entire floor.

[0006]

However, even if the repair is performed by the conventional method, the durability is fundamentally low as described above, and there is a problem that cracks may recur. In addition, particularly in the method of joining solidified materials, there is a problem that the integrity of the repaired portion and the unrepaired portion is weak.

On the other hand, with respect to this problem, the applicant of the present application, in Japanese Patent Application No. 2000-291750, removes the surface layer of the existing floor formed by the solidifying material, and the concave portion for forming the reinforcing column is formed in the removed portion. We have proposed a method for repairing an existing floor that forms a new surface layer by placing a fiber-reinforced solidified material after forming a groove for forming a reinforcing beam and a groove for forming a reinforcing beam, respectively. Can be solved.

However, this Japanese Patent Application No. 2000-291750
The method described in No. is to form a groove for forming a reinforcing beam in an unrepaired part.However, when the floor where reinforcing bars are arranged in part or all of the interior is targeted, this reinforcing bar is the unrepaired part. It was supposed that there would be an obstacle to the formation of the groove. It is not impossible to remove the existing reinforcing bars by cutting or to remove only the concrete part by leaving the existing reinforcing bars, but such work is basically complicated. In addition, Japanese Patent Application 2000-
When the unrepaired part is used as a foundation as in the construction method described in No. 291750, it is desirable to avoid as much as possible steps such as the removal of reinforcing bars that would lower the strength of the foundation or promote deterioration. .

Therefore, the main object of the present invention is to provide a highly durable floor with a high degree of integration between the repaired portion and the unrepaired portion, and to provide an existing floor with reinforcing bars inside. It is also to provide a construction method that can be easily constructed without lowering the strength of the unrepaired part.

[0010]

The present invention, which has solved the above-mentioned problems, is as follows. <Claim 1> The reinforcing bars are formed of a solidified material, and the reinforcing bars are spaced inside.
To remove the surface layer of the existing floor are arranged a plurality you are, by forming a new surface layer on the removed portion, a repair method of the existing floor to perform renovation of the existing floor, between rebars definitive in the removed portion An existing floor, characterized in that a fiber-reinforced solidifying material is cast to form a new surface layer after extending and forming a reinforced hole for forming a reinforcing column to a position below the depth position of the reinforcing bar. Repair method.

<Operation and effect> In the floor thus renovated, a new surface layer is formed on the remaining portion of the existing floor, and the reinforcing fibers are well dispersed in the entire newly cast portion and formed on the remaining portion of the existing floor. Reinforcing columns are formed as a part of the new surface layer by the solidifying material filled in the concave holes. Then, in such a repaired floor, the reinforcing column portion firmly digs into the remaining portion of the existing floor, remarkably increasing the integrity of the new surface layer and the existing floor, and the reinforcing fibers are embedded in the new surface layer in a uniformly dispersed state. As a result, the strength of the new surface layer itself (particularly on the surface) is significantly increased and the durability is also significantly increased. Therefore, it is not necessary to deeply cut the existing floor more than necessary, and the cost and the construction period can be shortened.

Further, such a concave hole for forming a reinforcing column is disclosed in Japanese Patent Application No.
Unlike the groove for forming a beam of the construction method described in No. 00-291750, there is no need to extend in the direction along the floor surface, and the degree of freedom in design is high as described above. Therefore, even when a plurality of reinforcing bars are arranged at intervals in the existing floor, the reinforcing column forming recessed holes can be formed to a sufficient depth below the reinforcing bar depth position while avoiding this. Further, by adopting such a concave hole forming mode, it becomes possible to prevent the reduction of the strength of the unrecovered portion due to the cutting and removing of the existing reinforcing bar without requiring a complicated work such as cutting and removing the existing reinforcing bar. .

<Claim 2> The fiber-reinforced solidified material is cast after forming both the reinforcing column forming concave hole and the reinforcing beam forming concave groove in the removed portion, respectively. Existing floor renovation method.

<Effect> The main point of the method of the present invention is to form the reinforcing column as a part of the new surface layer by forming the concave hole in the main removal portion as described above. 200
Reinforcement beam formation of the construction method described in 0-291750 can also be combined. In particular, when such a reinforcing beam is formed, the section modulus and the second moment of area of the new surface layer are increased, and the bending strength is significantly increased.

<Claim 3 > After forming a double or triple or more multiple annular groove portion in the removed portion , the uncut residual portion in the portion surrounded by the outermost annular groove portion is broken by applying an external force, The method for repairing an existing floor according to claim 1 or 2 , wherein concave holes for forming reinforcing columns are formed.

<Effects> By this method, it is possible to simply and easily form the concave hole for forming the reinforcing column.

<Claim 4 > As a surface layer removing process of the existing floor, at least a plurality of recessed grooves are formed at a target portion of the existing floor, and a convex portion between these recessed grooves is applied by an external force to be broken off. removing process, and subjected to a surface finishing treatment by shot blasting in this order, refurbishment method of the existing floor according to any one of claims 1-3.

<Operation and effect> By this main removal treatment, the surface layer of the existing floor can be removed while the remaining part is less damaged. In addition, by performing shot blasting treatment, a large number of minute irregularities are formed on the surface of the main removal treatment, the adhesion of the fiber-reinforced solidifying material that is placed later is increased, and thus the integrity of the new portion and the existing portion is improved. .

[0019] After the <claim 5> said main removal process, prior to the surface finishing processing, and slap the piston member is reciprocally driven in the processing target surface roughing treatment, repair method of the existing floor according to claim 4, wherein .

<Operation and Effect> Particularly when the existing floor is deteriorated, a relatively fragile portion may be exposed on the main removal treatment surface.
Further, the concrete floor also includes coarse aggregate having a grain size of 5 mm or more, and in the above-mentioned main removal treatment, coarse aggregate having such a large grain size remains in a floating state without being cut.
Therefore, in order to remove these fragile portions and floating aggregates, it is preferable to perform the rough cutting treatment according to the third aspect of the present invention after the main removal treatment.

<Claim 6 > Steel fiber reinforced concrete containing at least steel fibers as fibers is used as the fiber reinforced solidifying material.
The existing floor renovation method according to any one of 5 above.

<Operation and effect> By using the steel fiber reinforced concrete, the strength of the new surface layer portion is remarkably increased and the integrity with the remaining portion of the existing floor is improved.

[0023] As <claim 7> wherein the fiber reinforcing solidifying agent, slump value or less is used of the fiber reinforced solidifying material 13cm, claim 1-6 1
The existing floor renovation method described in paragraph.

<Operation and Effect> By setting such a very low slump value, it is possible to reduce the drying shrinkage of the new surface layer. It is also possible to hold steel fibers in a well dispersed form in the solidified material during casting.

<Claim 8 > A vibration is applied to the cast and unsolidified fiber-reinforced solidified material from its surface side through a vibration-imparting member.
~ The method for repairing an existing floor according to any one of items 7 to 7 .

<Operation and effect> As a result, the cast and solidified material is compacted and densely filled in the surface layer removed portion (including the reinforcing beam forming concave groove), and the reinforcing fiber contained in the solidified material is The reinforcing fibers, which have been slightly settled due to the vibration, and are particularly exposed on the surface, are reliably embedded in the solidified material. In particular, when the slump value of the fiber-reinforced solidified material is lowered, it is difficult to densely fill the solidified material with ordinary casting because the consistency is high, but by applying such vibration, it is possible to achieve good dense packing. It is possible to improve the integration with the existing floor.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail for each step with reference to the accompanying drawings. <Preliminary survey> When refurbishing an existing floor, it is desirable to first conduct a preliminary survey such as the necessity of refurbishment. In determining whether or not the repair is necessary, for example, the existing floor is roughly checked to which of the damage ranks in Table 1 corresponds, and then the countermeasure is selected according to the selection table in FIG.

[0028]

[Table 1]

As a result, when it is necessary to repair,
For example, the following detailed survey will be conducted.

(A) Below, an existing floor 1 as shown in FIG. 2 is assumed, for example. In this case, the core specimens 3, 3 ... are roughly divided into three categories, that is, a relatively normal place, a place where cracks 2 are generated, and a place where corrosion is severe.
Samples are taken out and the existing floor 1 is inspected for coated floor material, upholstered floor material, oil, chemicals, paint, tar, adhesive, rust, etc., and the crack depth, length, density, etc. are measured. B) Furthermore, at appropriate intervals, height level measurement points 4,
It is desirable to set 4 ... and measure the height level of each part. As for the floor of the warehouse or the like, as shown in FIG. 3, for example, since the area near the center is used most frequently, the height level is often the lowest in that area. C) In addition, in a general concrete floor, joints are provided to prevent cracking of concrete caused by environmental changes such as temperature and humidity. This is also grasped by a preliminary survey and used as an index in forming a new surface joint. D) Also, the reinforcing bar rm in the existing floor 1 and the reinforcing bar rm arrangement state are grasped using a reinforcing bar exploration device or the like.

<Design> Based on the preliminary investigation, the removal thickness y1 of the existing floor 1
y2, the thickness of the new surface layer 11 and the formulation of the solidifying material are determined.

In the case of the floor, there is a problem such as opening and closing the door.
It is preferable that the removed thicknesses y1 and y2 are the same as the new surface layer thickness, and since the thickness is determined by the thickness up to a sound part of the existing floor, it cannot be said unconditionally, but the normal existing floor thickness y3 Is about 150 to 200 mm, yield is 30 to 100 mm, especially 30 to 50 m.
m is preferred. In particular, when the height level of the existing floor is not uniform as shown in FIG. 3 described above, the removal thicknesses y1 and y2 are changed accordingly, and the surface of the new surface layer 1N is determined to be horizontal. Is desirable.

Further, in the present invention, a fiber-reinforced solidifying material (concrete, mortar, etc.) is used as the solidifying material in order to enhance and improve the durability of the new surface layer 1N itself. In particular, at least steel fibers as fibers, for example (a) as shown in FIG.
Corrugated plate shape, (b) plate shape having spatula-shaped portions on both ends, (c) plate shape having corrugated irregularities on one surface, (d) steel fiber containing rod-shaped short fibers having disc-shaped convex portions on both ends It is preferable to use reinforced concrete. This enhances the new surface and increases resistance to bending, twisting and shearing forces. Moreover, there is also an advantage that the integrity of the existing floor and the new surface layer is improved by embedding this fiber in the reinforcing column or the beam portion described later and over the other portion.

Further, in the present invention, it is preferable to use a polymer fiber together. This prevents the occurrence of hair-like cracks on the surface of the new surface layer due to drying shrinkage.

On the other hand, Table 2 shows a concrete mix example. The composition in the table is 27MP compressive strength after 3 days of age.
This is a formulation example for achieving a or more, bending strength of 6.0 MPa or more, compression strength at 28 days of age 38 MPa or more, bending strength of 8.4 MPa or more, and slump value (target value) 8 ± 2.5 cm. The slump value is 0 to 1
It is preferably 3 cm, particularly 5.5 to 10.5 cm, whereby the adhesion strength is increased and the dry shrinkability is also improved. Further, especially when the industrial factory floor is targeted, early-strength cement or ultra-early-strength cement is used in order to shorten the construction period and shorten the plant shutdown period.

[0036]

[Table 2]

<Construction> (Surface Layer Removal Step) In the present invention, first, the surface layer of the portion to be rehabilitated (may be the entire surface) of the existing floor is roughly removed by the design thickness. For this reason, for example, a known vibrating concrete removing device (scraping device) may be used, but if the existing floor is aged to a certain extent, it will be excessive to the sound part below it due to the removal of the surface layer. There is a risk that it will be given a strong impact and deteriorate. Therefore, preferably, the surface layer according to the invention of claim 2 is removed.

That is, first, as shown in FIG. 5, 10 to 20 pieces of diamond cutter blades 10 having a width of 2 mm to 5 mm are coaxially arranged in parallel at intervals of 10 mm to 20 mm. By using a grooving device that cuts the object by rotating it around the axis while pressing it against the object, a large number of concave grooves 20 having a predetermined depth are formed in parallel with each other in the object portion of the existing floor. Next, as shown in FIG. 6, the spatula-shaped tip abutting member 31 of the chisel breaker 30 is pressed against the convex streak portions 21 between the recessed grooves 20, particularly the roots of the side surfaces of the recessed grooves 20. While being vibrated, the convex streak portion 21 is broken by applying an external force from the side. By doing so, the influence on the existing floor 1 can be suppressed to a minimum. In the illustrated example, the groove 2
A plurality of 0s are formed in parallel with each other, but not limited to this example, and may be formed in a grid pattern, for example.

Particularly when the existing floor 1 is deteriorated, a relatively fragile portion may be exposed on the main removal treatment surface. In the concrete floor, the grain size is 5 mm.
The above-mentioned coarse aggregate is also included, and the coarse aggregate having such a large particle size remains in a floating state without being cut in the above-mentioned main removal treatment. Therefore, in order to remove these fragile parts and floating aggregates, it is preferable to carry out a rough cutting process after the main removal process. A device for this is shown in FIG. This device 40 is generally called a scatterer, and is provided with a single or a plurality of piston members 41 having a bit at the lower end in a parallel arrangement, which is reciprocally driven in the vertical direction and hits the surface to be processed to perform rough cutting. Is. If the deterioration of the existing floor is at a low level, this rough cutting process can be omitted.

Thereafter, in order to clean and roughen the surface of the surface layer removed portion, surface treatment by so-called shot blasting is performed. The powder particles of steel, dust and particles generated by the blasting process are removed by the shot blasting device,
Be recovered. As a result, a large number of minute irregularities are uniformly formed on the surface of the removed portion, and the adhesion between the surface of the removed portion and the solidified material that is subsequently cast there becomes very good, and the existing floor and the new surface layer portion Increases the unity on the piecing surface.

(Step of Forming Reinforcement Column Forming Recessed Holes) In the present invention, next, as shown in FIGS. 8 and 9, reinforcement column forming recessed holes 50h, 50h are formed in the main removal surface 1S.
To form. It is desirable to provide a large number of the recessed holes 50h, 50h at intervals of, for example, about 200 to 500 mm, depending on the situation such as the floor area to be repaired. It is desirable that the depth y2 of the recessed hole 50h be deeper than the neutral surface nf that is the boundary between the compression region on the front surface side of the floor slab and the bending region on the back surface side. The shape of the recessed hole 50h is not particularly limited, and can be appropriately selected from a columnar shape, an elliptic cylinder shape, a polygonal pillar shape, a columnar shape whose cross-sectional area changes in the depth direction (for example, a truncated cone shape). The inner diameter d of the recessed hole 50h is not particularly limited, but 50
Approximately 500 mm, particularly 50 to 150 mm is desirable.

Further, as shown in the drawing, in many cases, a large number of reinforcing bars rm are arranged in a grid pattern in a general existing floor. The present invention has been made to target such existing floor, the rebar absence site between rebar rm, and forms a concave hole 50h so as to extend to below the reinforcing bar depth position. Normal,
The distance w between the reinforcing bars is about 100 to 150 mm,
Since the bar arrangement depth (cover thickness) y4 is 3 to 5 cm,
In such a case, it is preferable that the inner diameter d of the concave hole is 100 to 150 mm or less and the depth y5 is 7 to 10 cm.

Further, as shown in the drawing, the concave holes 51h, 51h are centered on the deep part such as the crack, especially the through hole.
Can also be formed.

On the other hand, when forming the recessed holes 50h and 51h of the present invention, for example, as shown in FIG. 10 (A), the inner pipe portion 81 having the annular bits b, b, b attached around the tip openings, A triple tubular drill 80 including an intermediate pipe portion 82 and an outer pipe portion 83 is used and pressed against the main removal surface 1S while being rotated at a predetermined position. As a result, FIG.
As shown in FIG. 10B, a triple annular groove portion consisting of the inner annular groove portion 91, the intermediate annular groove portion 92 and the outer annular groove portion 93 is formed by cutting, and subsequently, as shown in FIG. An external force is applied to the uncut portion inside the groove portion, that is, the convex remaining portion 101 and the annular convex portions 102 and 103 (for example, a minus driver or the like is used to form the groove portion 91,
By inserting into 92, 93 and applying a lateral force) and breaking off, a concave hole surrounded by the outer wall 93w of the outermost annular groove 93 can be formed. of course,
Although other perforation methods can be adopted in the present invention, such a method has an advantage that it is very easy and the apparatus used is compact. Also in this example,
Although the triple annular groove is formed, it can be doubled when the pore size is small, or quadruple or more when the pore size is large.

(New Surface Layer Forming Step) After the above processing is completed, the above-mentioned fiber-reinforced solidifying material is then preferably manufactured on site, and then the entire surface layer-removed portion (including the reinforced column forming concave hole) is covered. To set. In particular, steel fiber reinforced concrete contains steel fibers, and in order to disperse the steel fibers well in the solidifying material, it is desirable to knead them on site using a powerful mixer device and immediately pour them. Further, by lowering the slump value, the dispersibility of the steel fiber becomes good. As a specific example of the manufacturing procedure, first, a twin-screw forced kneading mixer is used, and the total amount of sand, cement, aggregate, and fibers is added in this order, and kneading (no water is added) for about 30 seconds. After that, add the water containing the additive to the design amount (about 90%) and knead for about 60 seconds, then knead while adding water slowly in the range of the remaining amount to design. Adjust to slump value.

In addition, at the time of driving, if steel fibers are contained or the slump value is low, pumping becomes difficult, so a cat car, a crawler type carrier, a belt conveyor, etc. are used for charging and driving. It is desirable to do. As described above, the casting thickness is preferably the same as the surface layer removal thickness.

Once the fiber-reinforced solidifying material has been cast, FIG.
As shown in (1), the cast and solidified material C is roughly stretched by using the register marks 60 and the like, and then finely spread by using the screed 70 and the like. In the case of the present invention, it is preferable to apply vibration to the unsolidified fiber-reinforced solidified material C from the surface side thereof through the vibration-imparting member after the spreading and leveling. Particularly preferably, it is preferable to use the vibrating screed device 70 as shown. The vibrating screed device 70 is composed of a screed main body 71 having a triangular cross-section with a pair of equalizing angles 71A at its lower end, and vibration generating means attached to the screed main body 71. . The vibration generating means 72 in the illustrated example is an air supply pump 7.
Although the air vibrator includes 2A and the air-driven vibration generator 72B, a vibration generator driven by a rotary drive source such as an engine may be used.

When laying and leveling, rails 73 are laid on both sides of the target site, and the screed device 70 is placed so as to straddle between these rails, and then the vibration generating means 72.
Is operated and the traveling handle 74 is appropriately rotated to cause the screed device 70 to travel on the rail 73. As a result, at the same time as spreading and leveling the surface of the cast solidified material C, the cast solidified material C is compacted and densely filled in the surface layer removed portion (including the recess for forming the reinforcing column) and solidified. The reinforcing fibers contained in the material C slightly settle due to vibration, and the reinforcing fibers exposed on the surface are certainly embedded in the solidified material C. In particular, when the slump value of the fiber-reinforced solidifying material C is lowered, it is difficult to densely fill the solidifying material with ordinary casting because the consistency is high. It is possible to improve the integrity with the existing floor.

Further, as the final surface finish, the surface is smoothed by a trowell (rotary disc spreader) so that the surface is sufficiently pressed, and the corners and details are finished with a metal trowel.

After the above-mentioned setting work is completed, 1-2
After hours (in the case of early-strength cement), perform joint cutting if necessary. At this time, it is preferable that the joints to be provided on the new surface layer are basically formed at the same locations as the joints of the existing floor 1 that have been investigated in advance. When the joints of the existing floor 1 are complicated, it is also possible to use an appropriate square joint having, for example, about 3 m on each side.

After that, it is preferable to carry out the wet curing for a predetermined period, for example, for at least about 7 consecutive days in the case of the above-mentioned early-strength cement compounding example. Usually, the surface after curing is applied with resin, paint, etc. to finish. Further, it is desirable that the joint is filled with a filler such as an epoxy resin after the curing is completely completed, for example, in the case of the above-mentioned early-strength cement compounding example, after curing for at least 28 days.

In the floor thus renovated, as shown in FIG.
As shown in FIG. 13 and FIG. 13, the new surface layer 1N is formed on the existing floor remaining portion 1, the reinforcing fibers are well dispersed throughout the new casting portion 1N, and the inside of the concave hole formed in the existing floor remaining portion 1 is formed. Reinforcing columns 1p, 1p, ... Are formed as a part of the new surface layer 1N by the solidified material filled in. And, in such a repaired floor, the reinforcing columns 1p, 1p ... bite firmly into the existing floor remaining portion 1 to remarkably enhance the integrity of the new surface layer 1N and the existing floor 1, and the reinforcing fiber 13, in the new surface layer 1N. By embedding 13 ... in a uniformly dispersed state, the strength (in particular, the surface) of the new surface layer 1N is remarkably increased and the durability is also remarkably increased. For this reason and for that reason, it is not necessary to deeply cut the existing floor 1 more than necessary, and cost reduction and construction period reduction can be realized.

(Combination of Reinforcing Beams) In the present invention, formation of reinforcing beams in the construction method described in Japanese Patent Application No. 2000-291750 may be combined. In this case, along with the formation of the recessed hole 50h, the reinforcement beam forming recessed grooves 50d, 50d are formed in the main removal surface 1S as shown in FIGS. 14 and 15, for example. This groove 5
0d and 50d depend on the situation such as the floor area to be repaired,
For example, a plurality of rows can be provided in parallel with each other at intervals of about 1000 to 2000 mm as shown in the figure. In particular, it is also preferable to form it in a lattice shape or the like in order to increase the strength in a plurality of directions (not shown). In addition, as shown in the drawing, the groove 51 is formed along a deep part such as a crack, especially a through hole.
It is also possible to form d and 51d. Groove 50d, 51
The depth of d is 20 to 40 mm, and the width is 30 to
About 50 mm is preferable.

The reinforcing beam forming concave grooves 50 and 51 have a small number of cutter blades (about 5 when forming a concave groove having a width of 50 mm) and the above-mentioned grooving device in which the mutual intervals of the processing cutter blades are reduced. It can be formed by using an apparatus (not shown) having the same structure as described above.

Thus, in the renovated floor, as shown in FIGS. 16 and 17, the new surface layer 1N is formed on the remaining portion of the existing floor, and the reinforcing fibers are well dispersed in the entire newly cast portion 1N. Moreover, the reinforcing beams 1g, 1g are formed as a part of the new surface layer 1N by the solidifying material filled in the concave groove formed in the existing floor remaining portion 1. Of course, the reinforcing columns 1p and 1p are also formed integrally with this. Characteristically, by forming the reinforcing beam portions 1g, 1g, not only the above-described effects but also the advantage that the section modulus and the second moment of area are increased and the bending strength is remarkably increased.

In the example shown in FIG. 14, the concave groove 50
Although the d and the recessed holes 50h are formed uniformly on the entire floor surface, they can be unevenly distributed. For example, the floor surface is divided into two regions depending on the presence or absence of reinforcing bars, and the recessed groove 50 is formed on one side.
It is also possible to form only d and to form only the concave hole 50h in the other (not shown).

[0057]

As described above, according to the present invention, only the surface layer of the existing floor can be repaired, low cost and short-term construction are possible, and the repaired portion and the unrepaired portion are highly integrated and durable. It becomes possible to construct a high floor, and even if it is an existing floor in which reinforcing bars are arranged inside, it is possible to easily carry out construction without lowering the strength of the unrepaired part.

[Brief description of drawings]

FIG. 1 is a countermeasure selection table for existing floors.

FIG. 2 is a plan view of an existing floor.

FIG. 3 is a vertical sectional view of an existing floor.

FIG. 4 is a perspective view showing a steel reinforcing fiber.

FIG. 5 is a perspective view showing a groove cutting step in a main removing step.

FIG. 6 is a perspective view showing a convex portion removing step of the main removing step.

FIG. 7 is a perspective view of an apparatus used in a rough cutting process.

FIG. 8 shows the floor with recessed holes for forming reinforcement columns,
It is a top view.

FIG. 9 shows the floor with recessed holes for forming reinforcement columns,
FIG.

10 (A) is a vertical sectional view, FIG. 10 (B) is a plan view, and FIG. 10 (C) is a vertical sectional view schematically showing how to form a recess for forming a reinforcing column.

FIG. 11 is a perspective view showing a fiber-reinforced concrete placing / laying / vibrating step.

FIG. 12 is a plan view showing the floor after construction is completed.

FIG. 13 is a vertical cross-sectional view showing the floor after construction is completed.

FIG. 14 is a plan view showing a floor in a state where a reinforcing column forming concave hole and a reinforcing beam forming concave groove are formed.

FIG. 15 is a vertical cross-sectional view showing a floor in a state where a reinforcing column forming recess and a reinforcing beam forming recess are formed.

FIG. 16 is a plan view showing the floor after completion of construction.

FIG. 17 is a vertical cross-sectional view showing the floor after completion of construction.

[Explanation of symbols]

1 ... Existing floor, 1N ... New surface layer, 1G ... Reinforcement beam part, 2 ... Crack, 3 ... Core extraction part, 4 ... Height level measurement point,
10 ... Grooving device, 20 ... Recessed groove, 21 ... Convex part, 3
0 ... Chisel breaker, 31 ... Spatula-shaped tip abutting member, 4
0 ... Roughing device, 50h, 51h ... Recessed column forming concave hole,
60 ... Dragonfly, 70 ... Vibration screed device, C ... Fiber reinforced solidifying material .

Continuation of the front page (56) References JP-A-11-278904 (JP, A) JP-A-5-214820 (JP, A) JP-A-62-233378 (JP, A) Actual development Sho-62-196840 (JP , U) Actual Kaihei 6-47502 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04G 23/02 B28D 1/14

Claims (8)

(57) [Claims] 1. A steel formed from a solidified material and having iron inside.
A method of repairing an existing floor, in which the surface layer of an existing floor in which a plurality of streaks are arranged at intervals is removed and a new surface layer is formed in the removed portion, thereby improving the existing floor. the site between definitive reinforcement of the reinforcing bar depth position than
By pouring the fiber-reinforced solidifying material after extending form the reinforcing post forming recessed hole to below, the forming a new surface layer, refurbishment method of the existing floor, characterized in that. 2. The existing floor according to claim 1, wherein the fiber-reinforced solidifying material is cast after forming both the reinforcing column forming concave hole and the reinforcing beam forming concave groove in the removed portion. Repair method. 3. The reinforcement column formation by forming a double or triple or more multiple annular groove portion in the removed portion , and then breaking off an uncut residual portion in a portion surrounded by the outermost annular groove portion by applying an external force. A recessed hole for use is formed.
Or the existing floor renovation method described in 2 . 4. A main removal process for forming a surface layer on the existing floor, wherein at least a plurality of recessed grooves are formed in a target portion of the existing floor, and a convex portion between the recessed grooves is applied and externally folded off. and performing a surface finishing treatment by shot blasting in this order, refurbishment method of the existing floor according to any one of claims 1-3. 5. The method for repairing an existing floor according to claim 4 , wherein after the main removing treatment, a roughing treatment is performed prior to the surface finishing treatment, in which a reciprocally driven piston member is struck against a surface to be treated. 6. The method for repairing an existing floor according to claim 1, wherein steel fiber reinforced concrete containing at least steel fibers as fibers is used as the fiber reinforced solidifying material. 7. The fiber-reinforced solidifying material having a slump value of 13 cm or less is used as the fiber-reinforced solidifying material.
The method for repairing an existing floor according to any one of 1. 8. The existing floor of any one of claims 1 to 7 , wherein vibration is applied from the surface side of the cast unsolidified fiber-reinforced solidified material through a vibration-imparting member. Repair method.