JP2579270B2 - Method and apparatus for removing existing spray - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the construction of a mortar or cement sprayed for the purpose of strengthening a slope or a slope when the sprayed mortar or cement is aged, such as rising from the ground (spray surface). In particular, the present invention relates to a method of removing work, regardless of the condition of a slope or a slope on which removal work is performed, is excellent in work efficiency, and is inexpensive.

[0002]

2. Description of the Related Art Conventionally, when removing existing mortar or concrete spraying on a slope or slope, a method of removing the mortar mainly by using a backhoe or the like has been used. Has been removed manually using a breaker or the like.

[0003]

However, the conventional removal method has problems such as limitations on slopes and slopes on which work is performed, inefficiency, and high costs.

That is, in the conventional removal method using a machine, the height at which work can be performed, the work space, the slope of the slope on which work is performed, and the like are limited. In this case, the existing spray is removed by crushing manually. However, such manual removal work has problems such as inefficiency, high cost, and adverse effects on the human body due to dust and vibration.

[0005] The present invention has been made in view of the above situation, and by removing the existing spray by a simple method, the present invention is not affected by the conditions of the slope or slope on which the work is performed, and
An object of the present invention is to provide a method and an apparatus for removing an existing spray with high working efficiency. Another object of the present invention is to provide a method and an apparatus for removing an existing spray which are highly safe because the work is performed by a simple method and which does not require any special equipment for the same and is economical.

It is another object of the present invention to provide a method and an apparatus for removing an existing spray, which eliminates the problem of worker's health by almost eliminating the need to perform work by relying on human power.

[0007]

In order to achieve the above-mentioned object, a removing method according to the present invention is a method for removing an existing mortar or concrete spray, which is formed between the mortar or concrete spray and a spray surface. The air bag is inserted into the gap, the compressed air is filled into the air bag, and the mortar or concrete spray is lifted and removed from the spraying surface by using the expansion force generated by the expansion of the air bag. .

In order to achieve the above-mentioned object, a removing apparatus according to the present invention includes an air injection pipe and an air discharge pipe, has a pressure resistance of 5 kg / cm ² or more, and has an existing spray and a spray surface. An airbag that can be inserted into a space formed between the airbags and is inflatable larger than the space, and a unit that supplies compressed air to the airbag are provided.

Preferably, the removing device has a cover for protecting the air bag and for easily inserting the air bag into a gap between the spray and the ground.

[0010]

The air bag, which is not filled with air, can be easily inserted into the narrow gap between the existing spray and the spray surface, and is filled with compressed air after insertion, so that the inflation force of the air bag can be increased. The existing spray can be easily lifted and removed by using the.

Further, the inflation force of the air bag acts in a direction perpendicular to the spray surface, so that the existing spray can be efficiently lifted.

Further, at the time of spraying, there is a case where an anchor pin or the like is driven to firmly adhere the spray to the spraying surface. In such a case, the direction in which the anchor pin is pulled out and the inflation of the air bag are increased. Since the direction in which the force acts is perpendicular to the spraying surface, the anchor pin can be efficiently pulled out.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method for removing an existing spray according to the present invention will be described.
This will be described with reference to FIGS. 1 to 3 show a state in which a cut is made in the mortar sprayed on the slope.

FIG. 1 shows a case where the spray width A of the existing mortar (spray) 1 is about 2 m. As shown in FIG. 1, cuts 2 and 3 are formed on a mortar 1 with a call pick or a concrete cutter. The cuts 2 and 3 are for cutting the mortar 1 into a size that is easy to remove, and it is preferable to cut the mortar 4 so that one side of the mortar 4 is about 2 m. However, depending on the type of base material used for spraying (sprayed base material) and the case where an anchor pin is driven,
Since the strength of adhesion between the spray and the ground differs, the size of the spray is appropriately adjusted accordingly.

FIG. 2 shows a case where the removal operation is started from the upper end when the existing mortar 10 is sprayed over a wide area. As shown in FIG. 2, the cuts 11, 1, 1
Add 2,13. The size of the divided mortar 14 is preferably about 2 m on one side, as in the case shown in FIG. 1, but can be adjusted appropriately.

Further, when it is desired to remove only a part of the central part of the existing spraying or to start the removing operation from the central part, as shown in FIG. In the side, cut 21, 22, 23, 2
Attach 4. The size of the divided mortar 25 is also preferably about 2 m on one side, as in the case shown in FIG.
It can be adjusted appropriately.

FIG. 4 is a schematic sectional view showing a state in which an air bag 33 not filled with air is inserted into a gap 32 formed between the mortar 30 and the spray surface 31. First, an opening 35 for inserting the airbag 33 is formed in a cut 34 provided in the mortar 30, and the airbag 33 is inserted into the gap 32 through the opening 35 (the airbag will be described later in detail). Do).

The void portion 32 is formed when the mortar 30 is deteriorated and floats from the spraying surface 31, and has a width h of 2c.
m to 10 cm. If the width h of the gap 32 is small and the air bag 33 cannot be inserted sufficiently, the opening 35
, The mortar 30 is lifted by hand, and the width h of the gap 32 is increased to the extent that the airbag 33 can be inserted. The removal method according to the present invention is originally performed when the existing spray is aging and a gap is already formed between the spray and the ground. Enlarging the width h of the portion 32 can be easily performed manually.

FIG. 5 is a schematic sectional view showing a state in which compressed air is filled in the air bag 43 inserted into the gap portion 42. In the present embodiment, when the mortar 40 is sprayed, the anchor pins 45 and 46 are driven to strengthen the adhesion between the mortar 40 and the spraying surface 41. As a result, the mortar 40 is peeled off from the spray surface 41 together with the anchor pins 45 and 46.

The mortar 40 is completely separated from the spraying surface 41 because the air bag 43 cannot be inserted to the center of the mortar 40 depending on the position where the anchor pins 45 and 46 are driven. May not be possible. In such a case, as shown in FIG. 5, by pulling out the anchor pins 45 and 46 by the inflation of the airbag 43, another airbag 44 (in a state not filled with air) is formed in the gap. It can be inserted deeper into the part 42. in this way,
Until the cut mortar 40 is completely separated from the spray surface 41, the operation of inserting the air bag and filling the compressed air is sequentially and repeatedly performed.

Further, when making a cut to the existing spray, when the size of the existing spray to be cut is larger than 2 m square, or when an airbag is inserted from the end of the existing spray without making a cut, The above-described working method of sequentially inserting air bags and filling with compressed air can be used.

When the upper part of the mortar 40 is separated from the spray surface 41, a hook is placed on the upper end of the mortar 40, and the mortar 40 is pulled by a power (not shown) by a machine (not shown).
A method of withdrawing the mortar 40 can also be used. The machine does not need to be installed on the slope where work is performed, and can be appropriately installed in a horizontal place where it can be easily installed. Therefore, the height of the work place, work space, work It is not affected by conditions such as the slope of the slope.

In the above, the method of removing the existing spray according to the present invention has been described in accordance with the case where the existing spray which has been sprayed on the slope has deteriorated and a gap has been formed between the existing spray and the ground. ,
The present invention is not limited to this, and can be performed by artificially forming a gap even when no gap is formed between the existing spray and the spray surface (not limited to the ground). it can.

FIG. 6 shows an air bag (with no compressed air) of the removing device according to one embodiment of the present invention. The removing device has a compressed air supply means (not shown) and an air bag 50. The air bag 50 includes a bag body 501 for filling compressed air, a tube 502 for injecting air, and an air discharging tube. And a tube 503. The plane shape of the bag body 501 is a square with a side of 50 cm, but the size and shape are not limited to this.
It may be circular or elliptical. The thickness of the bag body 501 when filled with compressed air is a thickness sufficient to form a space for peeling off the existing spray, and is preferably 30 cm.
From about 50 cm, but depending on the conditions of removal work,
It can be changed as appropriate. In addition, the air injection tube 502 and the air discharge tube 503 should be connected to a compressed air supply means such as a compressor appropriately installed in a horizontal place where the installation is easy (it is not necessary to be a slope for performing the work). Must be long enough Furthermore, the material of the airbag 50 is high in airtightness and 5 kg.
Various materials can be used as long as they have a strength capable of withstanding a pressure of / cm ² or more. For example, a polymer resin or the like is used.

When the air bag 50 is filled with 5 kg / cm ² of compressed air, the force P by which the air bag 50 lifts the existing spray is P = 5 kg / cm ² × 50 cm × 50 cm = 12.5 t.

On the other hand, when mortar (density: 2.3 t / m ³ ) is sprayed with a spray thickness of 0.07 m, the force q 1 required to lift this mortar 1 m ² is: q 1 = 2.3 t / m ³ × it is a 0.07m × 1m ² = 0.161t.

The force required to pull out the anchor pin is approximately 1 t per pin, so that 1 m ²
1m when two anchor pins are driven in
Force q2 required to pull out ^two anchor pins
Is as follows: q2 = 1t / line × 2 lines = 2t.

Therefore, the force Q required to lift 1 m ² of the existing spray (mortar with anchor pin) is as follows: Q = q 1 + q 2 = 2.161 t

Therefore, the area of the existing spray that can be lifted by the airbag 50 is 5.8 m ² from P / Q = 12.5t / 2.161t = 5.8. In other words, when the mortar is cut into 2m square, the anchor pin is 1m2 Even if two mortars are driven in, the cut mortar can be separated from the ground by inserting and inflating one air bag 50 in principle.

FIGS. 7 and 8 are schematic side views showing a main part of a removing device according to another embodiment of the present invention. FIG. 7 shows a state in which the airbag is not filled with air, and FIG. 8 shows a state in which the airbag is filled with air. The airbag 60 includes flat plates 611 and 6 of the cover 61.
12 so as to be sandwiched from above and below. The cover 61 facilitates the insertion of the airbag 60 into the gap, and protects the airbag 60 from protrusions and anchor pins on the back surface of the existing spray and the surface of the ground. The cover 61 includes two flat plates 611 and 61
2, and two telescopic struts 613 and 614, which are opening and closing mechanisms for connecting the flat plates so as to be able to open and close. Flat plate 611
And 612 are curved inward to facilitate insertion of the airbag 60 into the gap and to protect the distal end of the airbag 60 during insertion.

As shown in FIG. 8, when the air bag 60 is filled with compressed air, the air bag 60 is inflated, and the telescopic columns 613 and 614 are extended. Since the inflation force of the airbag 60 acts uniformly on the entire flat plates 611 and 612, the flat plates 611 and 612 spread in parallel with each other, and the inflation force of the airbag 60 acts vertically on the ground.
Therefore, it is possible to efficiently pull out the anchor pin and lift the existing spray.

FIGS. 9 and 10 are schematic side views showing a main part of a removing device according to still another embodiment of the present invention. FIG.
FIG. 10 shows a state in which the air bag is not filled with air, and FIG. 10 shows a state in which air is filled. The airbag 70 is a flat plate 71 of the cover 71.
1, 712 so as to be sandwiched from above and below. The cover 71 facilitates the insertion of the airbag 70 into the air gap, and protects the airbag 70 from protrusions, anchor pins, and the like on the back surface of the existing spray and the surface of the ground. The cover 71 includes two flat plates 711 and 712, an opening / closing lock 713 that is an opening / closing mechanism that opens and closes the flat plates, and a function that the air bag 70 jumps out of the cover 71 when the air bag 70 is filled with compressed air. It consists of metal fittings 714 and 715 for prevention.

As shown in FIG. 10, when the air bag 70 is filled with compressed air, the air bag 70 is inflated,
Since the flat plates 711 and 712 are opened with the opening / closing lock 713 as a fulcrum, the inflation force of the airbag 70 acts to flip the existing spray from the opening. Therefore, by repeating the operation of sequentially inserting and inflating the airbag from the vicinity of the opening of the existing spray to the back, the existing spray can be peeled off. In addition, as long as the flat plates 711 and 712 are rotatably connected, a connecting member other than the lock 713 can be used.

The flat plates 611, 61 constituting the cover
The materials 2, 711, and 712 are suitably made of sturdy lightweight steel. Furthermore, when there are irregularities on the back surface of the existing spray and the surface of the spray surface, the force applied to the surface of the flat plate when lifting the existing spray from the spray surface via the flat plates 611, 612, 711, and 712 becomes uniform. As described above, a resilient material such as a rubber plate may be attached (attached) to the surface of the flat plate.

[0035]

According to the removing method of the present invention, the removing operation can be performed efficiently without being affected by the working conditions and without relying on human power. That is, since the removal operation is performed by a simple method using the airbag, the operation is not affected by the operation conditions such as the height of the work place, the work space, and the slope of the work slope. For this reason, the removal operation can be performed even on the slopes under various conditions, and there is almost no need to rely on human power for removal. Therefore, it is possible to solve problems such as high cost, inefficiency, and adverse effects on health due to dust and vibration, which are problems when performing work manually.
Furthermore, since compressed air is used, it is powerful and highly safe, and the only equipment required is a compressor, which is extremely economical.

In addition, by using a removal device having a cover attached to the airbag, the removal device can be easily inserted into the gap, and the airbag can be easily removed from projections and anchor pins on the back surface of the existing spray and the surface of the ground. Because it can be protected, it can respond to various working conditions.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a construction of a removing method according to the present invention.

FIG. 2 is a schematic view showing an example of the construction of the removing method according to the present invention.

FIG. 3 is a schematic view showing an example of construction of a removing method according to the present invention.

FIG. 4 is a schematic view showing an example of the construction of the removing method according to the present invention.

FIG. 5 is a schematic view showing an example of construction of a removing method according to the present invention.

FIG. 6 is an explanatory view showing an example of a removing device according to the present invention.

FIG. 7 is a schematic side view showing another example of the removing device according to the present invention.

FIG. 8 is a schematic side view showing a state in which compressed air is filled in the removing device according to FIG. 7;

FIG. 9 is a schematic side view showing still another example of the removing device according to the present invention.

FIG. 10 is a schematic side view showing a state where compressed air is filled in the removing device according to FIG. 9;

[Explanation of symbols]

 1, 10, 20, 30, 40 Mortar 31, 41 Spraying surface 32, 42 Air gap 33, 43, 44, 50, 60, 70 Air bag 61, 71 Cover

Claims (7)

(57) [Claims] 1. A method for removing an existing mortar or concrete spray, comprising inserting an air bag into a gap formed between the existing spray and the spray surface, and then filling the air bag with compressed air. Removing the existing spray from the spray surface using an expansion force generated by expansion of the spray. 2. A removal apparatus comprising: the airbag; a rigid flat plate that covers the airbag so as to sandwich the airbag from both sides; and a cover having an opening and closing mechanism that connects the flat plate so that the flat airbag can be opened and closed according to inflation and contraction of the airbag. 2. The existing device according to claim 1, wherein the device is inserted into the space with the cover closed, and the inflation is lifted from the spray surface through the cover and removed when the airbag is inflated. How to remove spray. 3. A method for removing an existing mortar or concrete spray, wherein an air bag is inserted into a gap formed between the existing spray and the spray surface, and then the air bag is filled with compressed air. Utilizing the inflation force generated by the inflation, the existing spray is lifted from the spray surface, another air bag is inserted into a new gap formed thereby, and the other air bag is filled with compressed air. A method for removing an existing spray, wherein the existing spray is further lifted from a spray surface using an inflation force generated by inflation of another airbag. 4. An air supply system comprising an air injection pipe and an air discharge pipe.
It has a pressure resistance of not less than kg / cm ² and can be inserted into the gap formed between the existing spray and the spray surface,
In addition, there is provided an existing blower removing device, comprising: an airbag which can be inflated larger than the gap; and means for supplying compressed air to the airbag. 5. A vehicle according to claim 1, further comprising: a rigid flat plate covering said air bag so as to sandwich said air bag from both sides, and a cover having an opening / closing mechanism for connecting said flat plate so as to be able to open and close according to inflation and contraction of said air bag. 4. An existing spray removal device according to 4. 6. The removal device according to claim 5, wherein the opening / closing mechanism is an extendable column connecting the rigid flat plate. 7. The apparatus according to claim 5, wherein the opening / closing mechanism is an opening / closing lock that rotatably connects the rigid flat plate.