KR102286982B1 - Mortar composition manufacturing equipment and concrete repair method thereof - Google Patents

Abstract

A mortar mixing apparatus for concrete repair according to the present invention comprises: a main body part (110) in which mortar (M) for concrete repair is mixed; a driving part (160) including a stirring blade (161) installed on an inner side of the main body part (110), a rotary shaft (162) to which the stirring blade (161) is coupled and which passes through a lower surface of the main body part (110), and a driving motor (163) coupled to a lower portion of the rotary shaft (162) for driving the rotary shaft (162); and a filtration filter (150) installed on a side of the main body part (110) to suck in dust generated during the mixing of the mortar (M). The mortar mixing apparatus for concrete repair further comprises: an opening/closing part (120) formed on an upper surface of the main body part (110); a side suction part (130) installed on an upper surface of the main body part (110) and installed on the side of the opening/closing part (120) so as to suck in dust generated when the opening/closing part (120) is opened; and a main body part suction part (140) installed in a structure penetrating an upper surface of the main body part (110) so as to suck in dust generated inside the main body part (110). The filtration filter (150) is connected with the side suction part (130) and the main body part suction part (140) through a connection pipe, and dust in the side suction part (130) and the main body part suction part (140) is sucked in by the driving of a suction motor part (151) coupled to the filtration filter (150). The present invention has the advantage of being able to suck in all the dust generated when a composition is mixed and dust generated when a material is introduced to the main body part. To this end, in the present invention, as shown in FIG. 1, the side suction part (130) and the main body part suction part (140) are installed on the main body part (110).

Description

Mortar mixing device for concrete repair and method for repairing concrete structures using the same

The present invention relates to the field of construction, and more particularly, to a mortar mixing apparatus for repairing concrete and a method for repairing a concrete structure using the same.

Concrete is the most used as a construction material because it is easy to form and is inexpensive. These concrete structures are being repaired using mortar except for coarse aggregates in concrete.

Mortar, which is used as a repair material for dirt, must secure strength and usability as a repair material.

Since the mortar used as a repair material is not a composition produced on a large scale, it is most often mixed and sprayed on site.

The composition produced on a large scale can minimize environmental pollution during production by the dust reduction facility installed in the factory. However, in most cases where a separate dust reduction facility is not installed in the case of mixing in the field, environmental pollution such as dust occurs when the composition is mixed.

The present invention was derived to solve the above problems, and has excellent strength for repair of concrete structures, good workability, and mixing of mortar for concrete repair that can minimize dust generation even when mortar is mixed in the field A device and a method for repairing concrete structures using the same are presented.

In order to solve the above problems, the mortar mixing apparatus for concrete repair of the present invention includes a main body 110 for mixing the mortar for concrete repair (M); The stirring blade 161 installed on the inside of the main body 110, the stirring blade 161 is combined to drive the rotating shaft 162 penetrating the lower surface of the main body 110, the rotating shaft 162 a driving unit 160 having a driving motor 163 coupled to a lower portion of the rotating shaft 162; A filtering filter 150 installed on the side of the main body 110 to suck in the dust generated during mixing of the mortar (M); including, an opening and closing part 120 formed on the upper surface of the main body 110; In order to suck the dust generated when the opening/closing unit 120 is opened, a side suction unit 130 installed on the upper surface of the main body 110 and installed on the side of the opening/closing unit 120; In order to suck the dust generated inside the body part 110, the body part suction part 140 installed in a structure penetrating the upper surface of the body part 110; further including, the filtration filter 150 and the side suction unit 130 , the filtering filter 150 and the main body suction unit 140 are connected by a connecting pipe, and the suction motor unit 151 coupled to the filtering filter 150 is driven. The side suction unit 130 and the main body suction unit 140 to suck the dust.

The filtration filter 150 includes a first connection part (P1) connected to the body part suction part 140; the suction motor unit 151 coupled to the first connection unit P1; It is preferable that the filter unit 152 coupled to the suction motor unit 150 has a structure in which the filter unit 152 adsorbs dust, and the air sucked when the dust is sucked is discharged.

The side suction part 130 is preferably connected to the main body suction part 140 by a second connection part P2.

The mixing is completed, the mortar (M) is a discharge port 170 formed in the lower side of the main body portion (110); a transfer pipe (P) coupled to the outlet (170); The injection device 200 coupled to the conveying pipe (P); Doedoe injection by a configuration including, the injection device 200 is a jet pipe 220 formed in an S-shaped structure; a coupling portion 210 formed at one end of the ejection pipe 220 to which the transfer pipe P is coupled; a ejection portion 230 coupled to the other end of the ejection pipe 220; In order to spray the mortar (M), it is preferable to include;

A method for repairing a concrete structure using a mortar mixing apparatus for repairing concrete according to an embodiment of the present invention includes: a damage cleaning step of removing and washing the damaged part 10 of the concrete structure 1; A chemical solution application step of forming an application layer 20-1 by applying a sphere reinforcing agent 20 to the bottom surface of the damaged part 10; A mortar filling step of filling the upper surface of the application layer (20-1) with the mortar (M) using the mortar mixing device 100 and the spray device 200 for concrete repair; and a coating layer forming step of applying a coating agent to the surface of the mortar (M) layer to form the coating layer 30 .

The mortar (M) is 40 to 60% by weight of cement; 30-50 wt% of fine aggregate; 3-5% by weight of a swelling agent; 0.5-5 wt% silica fume; 0.1 to 1% by weight of PVA fiber; 0.1 to 0.7 wt% of EVA resin; However, the PVA fiber is preferably 5 to 7 mm in length and 10 to 18 g/d in strength.

The coating agent is a two-component acrylic series, 59 to 80% by weight of acrylic epoxy; 14-35 wt% of curing agent; Calcium sulfate 5-7% by weight; it is preferable to include.

The mortar mixing apparatus for concrete repair according to the present invention has the advantage of reducing environmental pollution by minimizing dust generated during mortar manufacturing, while maintaining the worker's working environment in an optimal condition, and reducing civil complaints.

1 is a side view of a mixing apparatus according to an embodiment of the present invention;
Figure 2 is a view showing that the injection device is coupled to the mixing device according to an embodiment of the present invention;
3 is a view of an injector according to an embodiment of the present invention;
4 is a plan view of a mixing apparatus according to an embodiment of the present invention;
5 is a perspective view of a side suction unit according to an embodiment of the present invention;
6 is a perspective view of a body suction part according to an embodiment of the present invention;
7 is a perspective view of a filtration filter according to an embodiment of the present invention;
8 is a partial perspective view showing that the side suction unit and the main body suction unit are combined according to an embodiment of the present invention;
9 is a perspective view illustrating that the side suction unit is coupled to the side of the opening/closing unit according to an embodiment of the present invention;
10 is a view showing the suction of the dust generated when the material input after opening the opening and closing part according to an embodiment of the present invention to the side suction part
11 is a view showing that the side suction part and the main body suction part are connected to the filtration filter by the first connection part and the second connection part according to an embodiment of the present invention;
12 is a view showing the opening and closing part is opened according to an embodiment of the present invention;
13 is a view showing the occurrence of damage to the concrete structure;
14 is a process diagram of a damage correction step according to an embodiment of the present invention;
15 is a process diagram of a chemical application step according to an embodiment of the present invention;
16 is a process diagram of a mortar filling step according to an embodiment of the present invention;
17 is a process diagram of a coating layer forming step according to an embodiment of the present invention;

An embodiment of a mortar mixing apparatus for concrete repair according to the present invention and a method for repairing a concrete structure using the same will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same or corresponding components are the same drawings Numbers are given and overlapping descriptions thereof will be omitted.

In addition, terms such as first, second, etc. used below are merely identification symbols for distinguishing the same or corresponding components, and the same or corresponding components are limited by terms such as first, second, etc. no.

In addition, in the contact relationship between each component, the term "coupling" does not mean only when there is direct physical contact between each component, but another component is interposed between each component, so that the component is in the other component. It should be used as a concept that encompasses even the cases in which each is in contact.

Hereinafter, a mortar mixing apparatus for repairing concrete according to an embodiment of the present invention and a method for repairing a concrete structure using the same will be described in detail with reference to the accompanying tables and drawings.

The mortar mixing apparatus for concrete repair of the present invention includes a main body 110 for mixing the mortar for concrete repair (M); The stirring blade 161 installed inside the main body 110 and the stirring blade 161 are coupled to the rotating shaft 162 penetrating the lower surface of the main body 110 and the rotating shaft 162 to drive the rotating shaft 162 . a driving motor 163 coupled to the lower portion of the driving unit 160 having; The filtration filter 150 installed on the side of the main body 110 in order to suck the dust generated during mixing of the mortar (M); including, an opening and closing part 120 formed on the upper surface of the main body 110; In order to suck the dust generated when the opening/closing unit 120 is opened, the side suction unit 130 is installed on the upper surface of the body unit 110 and is provided on the side of the opening/closing unit 120; In order to suck the dust generated inside the body part 110, the body part suction part 140 installed in a structure penetrating the upper surface of the body part 110; The unit 130, the filtering filter 150 and the main body suction unit 140 are connected by a connecting pipe, and the side suction unit 130 by the driving of the suction motor unit 151 coupled to the filtering filter 150. and the dust of the main body suction unit 140 is sucked.

1 , the filtering filter 150 according to the present invention includes a first connection part P1 connected to the body suction part 140; Suction motor unit 151 coupled to the first connection unit (P1); It is preferable that the filter unit 152 is coupled to the suction motor unit 150; but, the filter unit 152 adsorbs dust, and the air sucked when the dust is sucked is discharged.

The present invention has the advantage of being able to inhale both the dust generated when the composition is mixed and the dust generated when the material is put into the body part. To this end, the present invention installs the side suction part 130 and the body suction part 140 on the body part 110 as shown in FIG. 1 .

The side suction part 130 is preferably connected to the body suction part 140 by the second connection part P2 in the structure as shown in FIG. 4 , and the side suction part 130 is the body part 110 as shown in FIG. 5 . The opening/closing part 120 of the opening is opened and a suction port is formed on the side to suck in the dust generated when the material is input.

Table 1 below confirms the dust generation degree of the existing mixer without the mixing device and the dust suction device according to the present invention. To verify the mixing effect of the mixing device, the flow test, compressive strength. The adhesion strength test was conducted together.

mixer type
(%) PM10 fine dust
(μg/m ³ ) flow
(mm) compressive strength
(MPa) Adhesive strength
(MPa) 3 days 7 days 28 days 28 days conventional mixer 180 200 30.6 43.6 51.1 1.6 invention mixer 90 190 31.2 42.9 53.4 1.8

As a result of the test, the dust generation rate can be reduced by 50%, minimizing environmental pollution during construction and reducing civil complaints.

The mixing is completed mortar (M) is a discharge port 170 formed in the lower side of the main body 110; A transfer pipe (P) coupled to the outlet (170); The injection device 200 coupled to the transport pipe (P); Doedoe injection by a configuration including, the injection device 200 is a jet pipe 220 formed in an S-shaped structure; A coupling portion 210 formed at one end of the ejection pipe 220 to which the transfer pipe (P) is coupled; The ejection portion 230 coupled to the other end of the ejection pipe 220; It is preferable to include; an air injection pipe 240 having an end located in the inner region of the ejection unit 230 through the ejection pipe 220 to inject the mortar (M).

The mixed mortar is sprayed by the conveying pipe P and the spraying device 200 combined in the structure shown in FIG. 2 . At this time, the injection device 200 is manufactured to have the same structure as in FIG. 3 , and the injection pipe 220 may have an inner diameter of 30 mm and an outer diameter of 46 mm. An air injection pipe 240 for injecting air having an inner diameter of 4 mm is coupled to the ejection pipe 220 .

The shape and size of the ejection pipe are designed to prevent clogging of the mortar, and the shape of the tube is designed to draw a gentle S-shape of the same diameter until just before the ejection part 230 to minimize clogging of PVA fibers. In the case of a spray gun type like the conventional method, it is difficult to remove foreign substances due to the complicated shape of the tube for air injection. In this case, the air jet pipe 240 is installed in a straight line shape without bending, so that foreign substances can be easily removed, and the material of the jet unit 230 is limited to rubber so that the separation and replacement of the jet unit 230 is easy.

A method for repairing a concrete structure using a mortar mixing apparatus for repairing concrete according to an embodiment of the present invention includes: a damage cleaning step of removing and washing the damaged part 10 of the concrete structure 1; A chemical solution application step of forming an application layer 20-1 by applying a sphere reinforcing agent 20 to the bottom surface of the damaged part 10; A mortar filling step of filling the upper surface of the application layer (20-1) with mortar (M) using the mortar mixing device 100 and the spray device 200 for concrete repair; and a coating layer forming step of applying a coating agent to the surface of the mortar (M) layer to form the coating layer 30 .

The mortar (M) used in the present invention is 40 to 60% by weight of cement; 30-50 wt% of fine aggregate; 3-5% by weight of a swelling agent; 0.5-5 wt% silica fume; 0.1 to 1% by weight of PVA fiber; 0.1 to 0.7 wt% of EVA resin; However, the PVA fiber is preferably 5 to 7 mm in length and 10 to 18 g/d in strength.

The coating agent is a two-component acrylic series, 59-80 wt% of acrylic epoxy; 14-35 wt% of curing agent; Calcium sulfate 5-7% by weight; it is preferable to include.

The mortar (M) composition according to the present invention incorporates 5-7 mm of PVA fiber to increase the flexural strength of the composition.

In order to confirm the strength characteristics of the mortar composition according to the PVA fiber mixing, as shown in Table 2 below, compressive strength and flexural strength tests were performed with the mortar composition having the same mixing ratio as in Comparative Examples and Examples. 6 mm of PVA fibers were incorporated in the test.

Mixing ratio (%) cement Silica fume swelling agent PVA glidant fine aggregate water Comparative Example 1 40 One 4 0 0.19 54.81 17 Example 1 40 One 4 0.2 0.19 54.61 17 Example 2 40 One 4 0.4 0.19 54.41 17 Example 3 40 One 4 0.6 0.19 54.21 17

Mix
No. PVA
(%) flow
(mm) Compressive strength (MPa) Flexural strength (MPa) 3 days 7 days 28 days 3 days 7 days 28 days Comparative Example 1 0.0 175 32.4 44.6 51.2 9.4 11.7 14.3 Example 1 0.2 170 34.2 47.2 52.9 9.3 11.6 16.2 Example 2 0.4 165 40.6 46.4 53.7 9.1 12.3 16.4 Example 3 0.6 150 41.5 46.5 54.2 9.6 11.8 17.2

As a result of the test, in the case of compressive strength, it was confirmed that the strength was improved from the initial age (3 days) to the strength of 28 days when PVA fibers were mixed.

In the case of flexural strength, the strength improvement was not confirmed at 3 days and 7 days, and it was confirmed that the flexural strength improved after the age of 28 days. In the case of flexural strength, an improvement range of 13 to 14% can be confirmed.

Table 4 below shows the compounding ratio according to the amount of polymer (EVA resin) mixed, and the compressive strength and flexural strength tests were performed for Comparative Example 2 and Examples 4,5,6.

Mix
No. W/B
(%) Mixing ratio (%) cement Silica fume swelling agent PVA EVA glidant fine aggregate water Comparative Example 2 37.8 40 One 4 0.2 0 0.19 54.61 17 Example 4 37.8 40 One 4 0.2 0.2 0.19 54.41 17 Example 5 37.8 40 One 4 0.2 0.4 0.19 54.21 17 Example 6 37.8 40 One 4 0.2 0.6 0.19 54.01 17

Mix
No. EVA
(%) Compressive strength (MPa) Flexural strength (MPa) 3 days 7 days 28 days 3 days 7 days 28 days Comparative Example 2 0.0 34.2 47.2 52.9 9.3 11.6 15.1 Example 4 0.2 31.8 43.2 50.2 9.6 10.2 12.2 Example 5 0.4 29.9 38.0 43.0 8.3 9.6 10.4 Example 6 0.6 25.2 32.3 39.9 7.8 8.5 10.8

The polymer applicable to the present invention is EVA resin or ACRYLATE resin. In order to examine the basic physical properties of the mortar according to the mixing ratio of these two polymers, the basic formulation determined based on the results of Example 1 was set as Comparative Example 2, and the EVA resin and ACRYLATE resin were increased by 0.2% by weight in the range of 0.2 to 0.6% by weight. The compressive strength (MPa) and flexural strength (MPa) according to the mixing ratio of EVA resin and ACRYLATE resin were measured.

As the amount of EVA resin added increases, the compressive strength and flexural strength at 28 days of curing tend to decrease, and the decrease in flexural strength is slightly larger than the tensile strength. The reason for the decrease in strength as the amount of EVA resin added increases is thought to be that, during the formation of the polymer composite, the polymer particles impede access to the cement particles and the mixing water and delay the hydration of the cement.

M : Mortar P : Transfer pipe
P1: first connection part P2: second connection part
1: concrete structure 10: damaged part
20: sphere reinforcing agent 20-1: coating layer
30: coating layer 100: mixing device
110: body part 120: opening and closing part
130: side suction unit 140: body suction unit
150: filtration filter 151: suction motor unit
152: filtration unit 160: driving unit
161: stirring blade 162: rotation shaft
163: drive motor 170: outlet
200: injection device 210: coupling part
220: ejection pipe 230: ejection part
240: air injection pipe

Claims (7)

The body part 110 for mixing the mortar (M) for concrete repair;
The stirring blade 161 installed on the inside of the main body 110, the stirring blade 161 is combined to drive the rotating shaft 162 penetrating the lower surface of the main body 110, the rotating shaft 162 a driving unit 160 having a driving motor 163 coupled to a lower portion of the rotating shaft 162;
A filtration filter 150 installed on the side of the main body 110 to suck in the dust generated during mixing of the mortar (M);
an opening/closing unit 120 formed on an upper surface of the body unit 110;
In order to suck the dust generated when the opening/closing unit 120 is opened, a side suction unit 130 installed on the upper surface of the main body 110 and installed on the side of the opening/closing unit 120;
In order to suck the dust generated inside the body part 110, the body part suction part 140 installed in a structure penetrating the upper surface of the body part 110; further comprising,
The filtration filter 150 and the side suction part 130, the filtration filter 150 and the body part suction part 140 are connected by a connecting pipe,
In addition to sucking the dust of the side suction unit 130 and the main body suction unit 140 by driving the suction motor unit 151 coupled to the filtration filter 150,
The filtration filter 150 is
a first connection part (P1) connected to the body part suction part 140;
the suction motor unit 151 coupled to the first connection unit P1;
Including; filtration unit 152 coupled to the suction motor unit 151;
The filter unit 152 has a structure in which the dust is adsorbed, and the air sucked when the dust is sucked is discharged,
The side suction part 130 is connected to the main body suction part 140 by a second connection part P2,
The mortar (M) after mixing is
an outlet 170 formed in the lower side of the main body 110;
a transfer pipe (P) coupled to the outlet (170);
Doedoe sprayed by a configuration comprising; the injection device 200 coupled to the transfer pipe (P),
The injector 200 is
The ejection pipe 220 formed in an S-shaped structure;
a coupling portion 210 formed at one end of the ejection pipe 220 to which the transfer pipe P is coupled;
a ejection portion 230 coupled to the other end of the ejection pipe 220;
Concrete repair mortar comprising a; an air injection pipe 240 having an end positioned in the inner region of the ejection part 230 through the ejection pipe 220 to inject the mortar (M) mixing device.
delete delete delete A method for repairing a concrete structure using the mortar mixing device for repairing concrete according to claim 1.
Damage irregularity step of removing and washing the damaged portion 10 of the concrete structure (1);
A chemical solution application step of forming an application layer 20-1 by applying a sphere reinforcing agent 20 to the bottom surface of the damaged part 10;
A mortar filling step of filling the upper surface of the application layer (20-1) with the mortar (M) using the mortar mixing device 100 and the spray device 200 for concrete repair;
A method for repairing a concrete structure comprising: applying a coating agent to the surface of the mortar (M) layer to form a coating layer (30).
6. The method of claim 5,
The mortar (M) is
Cement 40-60% by weight;
30-50 wt% of fine aggregate;
3-5% by weight of a swelling agent;
0.5-5 wt% silica fume;
0.1 to 1% by weight of PVA fiber;
0.1 to 0.7 wt% of EVA resin;
The PVA fiber has a length of 5 to 7 mm and a strength of 10 to 18 g/d.
7. The method of claim 6,
The coating agent is a two-component acrylic series,
59-80 wt% of acrylic epoxy;
14-35 wt% of curing agent;
Calcium sulfate 5-7 wt%; Concrete structure repair method comprising a.

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