JP2006272088A - Water absorption method and water absorption device for stick for static crushing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water absorption method and a water absorption device for a stick for static crushing capable of shortening the time required for the stick for static crushing housing an expandable crushing material inside a water permeable bag body to absorb water, improving workability and effectively demonstrating crushing force. <P>SOLUTION: In the water absorption method for the stick for static crushing for making the stick 104 for static crushing housing the expandable crushing material inside the water permeable bag body absorb water, the stick for static crushing is put in the water, an ambient environment is turned to a pressure reducing state by a pressure reducing device 103, and the pressure reducing state is turned to the vacuum of 50-98% to an ordinary pressure preferably. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a static crushing stick water absorption method and a water absorption apparatus, and more particularly to a static crushing stick for absorbing water in a static crushing stick containing an expandable crushing material in a permeable bag. The present invention relates to a water absorption method and a water absorption device.

Conventionally, as a method of crushing and repairing concrete surfaces such as roads and bridges that need to be repaired or repaired due to salt damage or aging due to long-term use, mechanical impact such as methods using a pick hammer or breaker, water jet method, etc. A method of crushing the concrete surface by applying vibration is adopted. The crushing method is a work involving vibrations, and there are problems such as the generation of dust such as concrete and deterioration of the working environment. Further, the crushing work on the lower surface or vertical surface of a structure such as a bridge is extremely labor intensive. Need. In addition, the lifting operation using the water jet requires a large-scale apparatus, and it takes time to clean up and is expensive. In particular, the crushing of concrete structures in water takes a lot of work in terms of work.
In addition, since these methods generate mechanical shock vibration, there is a possibility that cracks may occur inside unnecessary parts as well as necessary parts of concrete repair, and reinforcing members such as reinforcing bars may be damaged. There was a problem.

On the other hand, a method of statically crushing a structure such as concrete using an expansion material such as cement as a crushing material has been proposed. This is provided with perforations in the object to be crushed, separately knead the expandable crushing material and water, fill the obtained kneaded material in the perforations, the crushing material expands due to the hydration reaction of the crushing material, The object is crushed.
In this way, when kneading the expandable crushed material and water with a mixer, the influence of particle size variation, weathering, bulk specific gravity, etc. of the crushed material can be ignored, and a uniform slurry can be made. It cannot be used for upward or sideways drilling, and the work involved in filling from kneading to drilling is complicated, and the work time from kneading to filling is different for each drilling, and the development of expansion pressure is different. .

For this reason, as in Patent Document 1, a method has been proposed in which an expandable crushed material is accommodated in a container such as a paper bag, water is absorbed in the container before use, and the container is filled in perforations.
When the inflatable crushing material in a bag is immersed in water, the water immersion state inside the bag changes greatly due to the variation in the particle size of the powder, weathering, and the bulk specific gravity in the bag, which also affects the performance of the crushing ability. Further, in order to increase the crushing capacity, it is necessary to increase the filling rate of the expandable crushing material. For this reason, a fine grain size within the applicable range and a high bulk specific gravity are set. As a result, the inside of the bag is in a state where there is less air and the powder is clogged, and water is more difficult to penetrate into the bag. As a result, since the powder at the center of the bag is in a dry state or in a state in which moisture is insufficient, the crushing force is reduced, which causes a crushing failure.
JP-A-57-74447

On the other hand, as in Patent Document 2, in order to effectively prevent the blowing of the crushed material filled in the object to be crushed and the expansion pressure of the crushed material, A configuration for holding between two plate-like bodies composed of a plate and a bottom plate has also been proposed.
JP 61-36463 A

Moreover, in order to perform the static crushing method using the expansible crushing material more effectively, the inventors have effectively filled the explosive crushing material near the surface of the object to be crushed. The following patent document 3 proposed the static crushing auxiliary tool for that purpose.
This auxiliary tool is characterized by having a bottom plate disposed in the perforation, a top plate having a larger area than the bottom plate and disposed outside the perforation, and connecting means for connecting the two. Moreover, since the explosive crushing material (hereinafter referred to as “static crushing stick”) housed in the bag is integrated with the static crushing auxiliary tool, the operability of the static crushing stick is improved. At the same time, by making the top plate and the bottom plate close to each other, the filling rate of the expandable crushed material in the vicinity of the surface of the object to be crushed can be further increased.
Japanese Patent Application No. 2004-292859 (Filing date: October 5, 2004)

In the static crushing stick provided with such a static crushing auxiliary tool, it is difficult for water to enter the bag as described above, and in particular, water does not easily enter the center of the static crushing stick.
For this reason, the time for immersing the static crushing stick in water becomes longer, and workability is reduced. Moreover, since the start time of the hydration reaction of the expandable crushing material differs between the surface side and the inside side of the stick, it is difficult to adjust the timing of filling work into the perforation, and the bulk specific gravity of the expandable crushing material in the bag is reduced. If it was too high, there was a concern that the bag was damaged before the filling operation was completed due to the expansion of the crushing material on the surface side.

  The object of the present invention is to solve the above problems, reduce the time required for water absorption by the static crushing stick in which the expansible crushing material is housed in a water-permeable bag, improve workability, and effectively crush force. It is providing the water absorption method and water absorption apparatus of the stick for static crushing which can express.

  In order to solve the above-mentioned problem, in the invention according to claim 1, in the water absorption method of the static crushing stick for absorbing water into the static crushing stick in which the expansible crushing material is accommodated in the water-permeable bag. The static crushing stick is put in water and the surrounding environment is in a reduced pressure state.

  In the invention which concerns on Claim 2, in the water absorption method of the stick for static crushing of Claim 1, this pressure reduction state shall be 50-98% of a vacuum degree with respect to a normal pressure, It is characterized by the above-mentioned. A more preferable degree of vacuum is 90 to 95%.

  In the invention which concerns on Claim 3, in the water absorption method of the static crushing stick in any one of Claim 1 or 2, this bag body is formed with the nonwoven fabric, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the static crushing stick water absorption method according to any one of the first to third aspects, the static crushing stick includes a top plate and a bottom plate, and a connecting means for connecting the two. The static crushing auxiliary tool having the above is integrally incorporated.

  The invention which concerns on Claim 5 is the water absorption apparatus using the water absorption method of the static crushing stick in any one of Claims 1 thru | or 4.

  According to the first aspect of the present invention, since the static crushing stick is put in water and the surrounding environment is in a reduced pressure state, it is possible to quickly infiltrate the inside of the stick and greatly reduce the time required for water absorption. It becomes possible to do. Moreover, the work which concerns on a static crushing construction method can be performed smoothly by shortening the water absorption time, and workability | operativity becomes high. Further, since the water absorption time is short, the hydration reaction is started almost simultaneously on both the surface side and the inside side of the stick, and the timing of filling into the perforations can be easily adjusted.

  According to the invention of claim 2, the reduced pressure state is 50 to 98%, more preferably 90 to 95%, with respect to normal pressure, so that the static crushing stick effectively absorbs water, There is no problem such as boiling water in which the stick is immersed.

  According to the invention of claim 3, the bag body of the static crushing stick is formed of a nonwoven fabric. Even when a bag is formed of a material that is highly fragile to the expansion pressure of a long-time immersion or inflatable crushing material, such as a nonwoven fabric, the water absorption time can be shortened according to the present invention. Can be suitably used.

  According to the invention of claim 4, the static crushing stick is integrally incorporated with a static crushing auxiliary tool having a top plate and a bottom plate and a connecting means for connecting both. The static crushing auxiliary tool can absorb water in a short time to the inside of the static crushing stick according to the present invention even when the packing density of the explosive crushing material is increased when filling into the perforation. The convenience of the static crushing stick provided with such a static crushing auxiliary tool can be improved, and the expected crushing force can be expressed.

  The invention according to claim 5 is a water absorption device using the static crushing stick water absorption method according to any one of claims 1 to 4, so that the effects according to claims 1 to 4 described above can be realized. A water absorbing device can be provided.

The water absorption method and the water absorption device of the static crushing stick according to the present invention will be described with reference to the following preferred examples, but the present invention is not limited to these.
The static crushing stick water-absorbing method of the present invention is a static crushing stick water-absorbing method for absorbing water in a static crushing stick containing an expandable crushing material contained in a water-permeable bag. A static crushing stick is put in water and the surrounding environment is in a reduced pressure state.

  The stick for static crushing to which the present invention is applied, as in Patent Document 1, accommodates an expansible crushing material in a water-permeable bag like a nonwoven fabric or a fibrous net, and subdivides it into capsules. However, as shown in Patent Document 2 or 3, the present invention can be more suitably applied to a device provided with an auxiliary tool for static crushing.

FIG. 1 is a schematic view of a static crushing stick provided with a static crushing auxiliary tool to which the present invention is applied.
Specifically, the bottom plate 3 to which the connecting tool 23 as a connecting means is attached is inserted into the bag body 25 such as a nonwoven fabric, and the bag body is filled with the static crushing material. The opening of the bag body 25 is closed by appropriate fastening means such as heat sealing, and the top plate 20, the fixing means 26 and the traction means 24 for pulling the connection tool are attached to the connection tool 23 protruding from the bag body 25. .

  Further, in addition to the one shown in FIG. 1, it is also possible to pierce and attach the connecting tool to the capsule-like expansible crushing material. Since an opening is formed and the risk of leakage of the expandable crushed material from the opening increases, it is preferable to accommodate the bottom plate 3 or the like in the bag as shown in FIG.

Next, a method of using the static crushing stick with the auxiliary tool attached will be described.
The whole static crushing stick to which the auxiliary tool shown in FIG. 1 is attached is immersed in water, and moisture is contained in the expansible crushing material filled in the bag body 25. And as shown in FIG. 2, it installs in the inside of the perforation 1 formed in the crushing object.

The perforation depth H is opened deeper than the length (stick length) h from the top plate 20 to the bottom plate 3 (which may be the bottom surface of the bag) of the static crushing auxiliary tool.
Next, after the static crushing auxiliary tool is loaded in the perforation 1 (see FIG. 2A), the connecting tool 23 is pulled, the bottom plate 3 is pulled toward the top plate 20, and the expansibility arranged between them. It adjusts so that the packing density of the crushing material 2 may be raised (refer FIG.2 (b)). By this filling operation, it is possible to accelerate the generation of the expansion pressure of the crushed material, and to effectively generate a high expansion pressure in a direction perpendicular to the drilling direction (lateral direction in the figure).

  As shown in FIG. 2 (a), the static crushing auxiliary tool integrated with the bag body containing the expansible crushing material is inserted into the perforation 1 of the crushing object. Further, the static crushing auxiliary tool is smoothly inserted into the perforation 1 by making the outer diameter d of the bag body that accommodates a part of the connecting tool and the expandable crushing material 2 smaller than the inner diameter D of the perforation 1. Is possible. Thereafter, by operating the connecting tool 23 to bring the bottom plate 3 close to the top plate 20, the entire bag body is compressed in the vertical direction in the figure, and the inflatable crushing material 2 accommodated in the bag body is moved in the lateral direction. As a result, as shown in FIG. 2B, the inside of the perforation can be filled with the crushed material 2.

Next, the principle of crushing of the static crushing auxiliary tool filled in the perforations as described above will be described with reference to FIG.
A bottom plate 3 is disposed at a position away from the lower surface 7 of the perforation 1 with respect to the perforation 1 provided in the object to be crushed. The top plate 20 is connected to the upper part of the connection tool 23 by the fixing means 21, and between the top plate 20 and the bottom plate 3, an expandable crushed material is filled inside the perforations.

  As shown in FIG. 3, the top plate is configured to have an area larger than the area of the bottom plate, preferably larger than the area of the mouth portion of the perforation 1, and by disposing the top plate 20 outside the perforation 1, A sufficient expansible crushing material can also be filled and arranged in the vicinity of the perforated opening where the chipped portion 6 of the perforated 1 is generated. And the upward pressure of the expansion pressure of the crushed material is suppressed by the top plate 20, and it becomes possible to generate a crushing force much stronger than the conventional one around the perforation port. For reference, a pressure distribution 22 in a direction perpendicular to the drilling direction is schematically shown in FIG.

  As shown in FIG. 3, in the present invention, since the area of the top plate is larger than the area of the bottom plate, the upper force applied to the top plate becomes larger than the lower force applied to the bottom plate due to the expansion of the crushed material, Although there is a concern about floating, in reality, the frictional force between the crushed material and the inner wall surface of the perforation 1 increases due to the lateral expansion of the crushed material, so it is confirmed that there is almost no lifting of the top plate. ing.

Thus, by effectively applying the expansion pressure of the crushed material also to the vicinity of the mouth of the perforation, the generation of cracks on the surface side of the object to be crushed can be accelerated, and as a result, the crushing speed can be increased. it can.
Moreover, since a gap is formed in the vicinity of the bottom surface 7 as shown in FIG. 3, no expansion pressure is applied to the bottom surface 7.

Next, a method for causing the static crushing stick to absorb water will be described.
As shown in FIG. 4, the static crushing stick 104 is placed in a container 101 containing water, and the container 101 is placed in a vacuum desiccator 100 formed of polycarbonate or the like.
The vacuum desiccator 100 may also serve as the immersion container 101, and the material is not particularly limited as long as the material can maintain a reduced pressure. A material such as polycarbonate that can be observed inside can be used more suitably.

The vacuum desiccator 100 is connected to a decompression device 103 such as a vacuum pump, and the inside of the desiccator 100 is held in a decompressed state so that the degree of vacuum is 50 to 98%, preferably 90 to 95% with respect to normal pressure. .
A vacuum degree of 50 to 98% is an environment in which the static crushing stick effectively absorbs water. If the vacuum degree is lower than 50%, an improvement in the water absorption effect cannot be expected so much. This causes problems such as boiling of the water in which the stick is immersed.
In addition to the vacuum pump, a vacuum cleaner or a blower can be used as the decompression device 103.

When the water absorption state of the static crushing stick (S Mite Capsule, manufactured by Sumitomo Osaka Cement Co., Ltd.) was investigated in a normal pressure state and a reduced pressure state of 90% vacuum, the time for water to enter the capsule was normal pressure In the state, it was 3 to 20 minutes depending on the size of the stick, and in the reduced pressure state, it was within 1 minute, and the shortest was 15 seconds.
It was also found that the amount of water absorption was improved by about 10% in the reduced pressure state.
From these facts, it was confirmed that the method of absorbing water under reduced pressure was effective for the static crushing stick.

  As described above, according to the present invention, the static crushing stick in which the expansible crushing material is housed in a water-permeable bag shortens the time required for water absorption, has high workability, and effectively crushes. It is possible to provide a water absorption method and a water absorption device for a static crushing stick capable of expressing force.

It is a figure which shows the outline of the stick for static crushing provided with the auxiliary tool for static crushing. It is a figure explaining the usage method of the stick for static crushing provided with the auxiliary tool for static crushing. It is a schematic diagram which shows the internal pressure state by the stick for static crushing of FIG.2 (b). It is a figure which shows the outline of the water absorption apparatus of the stick for static crushing which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Perforation formed in crushing object 2 Expansible crushing material 3 Bottom plate 20 Top plate 21,26 Fixing means 22 Pressure distribution 23 Connecting tool 24 Pulling means 25 Bag body 100 Vacuum desiccator 101 Immersion container 103 Decompression device 104 Static crushing Stick

Claims (5)

In the water-absorbing method of the static crushing stick for absorbing the water into the static crushing stick that contains the expansible crushing material in the water-permeable bag body,
The static crushing stick water-absorbing method, wherein the static crushing stick is put in water and the surrounding environment is in a reduced pressure state.   The method for water absorption of a stick for static crushing according to claim 1, wherein the reduced pressure state is a vacuum degree of 50 to 98% with respect to normal pressure.   3. The method for water absorption of a static crushing stick according to claim 1 or 2, wherein the bag is formed of a nonwoven fabric.   The static crushing stick water-absorbing method according to any one of claims 1 to 3, wherein the static crushing stick includes a top plate and a bottom plate, and a connecting means for connecting the top plate and the bottom plate. A method for absorbing water from a static crushing stick, characterized in that the tool is integrally incorporated. The water absorption apparatus using the water absorption method of the stick for static crushing in any one of Claims 1 thru | or 4.

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