JPS6085163A - Filling of expansible crushing material using crack crushingof rock or concrete structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for filling a slurry of expanded crushed material in a demolition method in which cracks are generated in old bodies or concrete structures by the expansion pressure generated by the hydration reaction of the expanded crushed material.

Recently, expanding crushing materials (S-mite), which generate expansion pressure and cause cracks through a hydration reaction, have come into widespread use as a static crushing method for old or concrete structures.However, According to conventional construction methods, it takes a long time for cracks to occur, and it is unclear when cracks will occur.
The expansion destructive force was also weak. As a result, construction efficiency was low and economic effects were not good.

Conventionally, expanded crushed material was kneaded with water and filled with a slurry of the same concentration (water content ratio) (ignoring uneven concentration along the line). The optimum water content ratio required for the hydration reaction of the slurry is said to be about 25 cm, although it depends on the particle size of each component of the expanded and crushed material. When a slurry with a water content of about 25% is filled into a filling hole drilled in a concrete structure, the
After an hour the slurry will gush out. This ejection time is influenced by the pore diameter of the filling hole, the rise of the hydration reaction (acceleration state) of the expanded crushed material slurry, etc.

The smaller the particles of the expanded crushed material, the higher the temperature of the kneading water and the outside air temperature, and the lower the water content of the slurry, the faster the hydration reaction will start. Same condition as before (Bore bottom side and mouth side are the same (component 1 particle size).

When the slurry is filled with a slurry with a certain temperature (temperature, water content ratio), the temperature of the slurry rises due to the hydration reaction, but the temperature rises more in the central part and the end of the hole than in the one part of the filling hole, so the temperature rises less than in other parts. early. In this way, when a certain part reaches nearly 50°C before other parts (especially the mouth part of the filling hole), the hydration reaction becomes active and the temperature rapidly reaches 80~]OO°C.The hydration reaction The temperature rises even faster and rapidly rises to about 30°C.2 The resulting expansion pressure and the vaporization of unreacted water in the vicinity can cause the slurry to spew out, which can even be dangerous. The slurry was filled with a slurry with a low concentration of about 30% of the water content.Due to the high water content, the temperature rise of the slurry was low, and there was little risk of spouting. The method used was to pour slurry into the holes.As a result, the filling slurry separates, and the particles of the expanded crushed material sink downward, making the mouth area even more moist.Cracks are free to form. It is most effective to cause the cracks to form from the mouth of the filling hole, which has a surface, but as mentioned above, there is a lot of water at the mouth of the filling hole, and the cracking force is weak because there are few components of the expanded and crushed material.

It took a long time for cracks to occur. Alternatively, there is a method in which a capsule containing expanded and crushed material sealed in a sausage-like bag is soaked in water to become hydrated before use, and then stuffed into a filling hole.

Several capsules are packed into one hole, and in this case as well, conventionally the capsules were filled with the same water content on both the mouth and hole ends. Therefore, the risk of slurry spouting as described above was unavoidable.

The present invention was made in order to solve the drawbacks of the conventional construction method, and it promotes the hydration reaction from the mouth side of the hole earlier than the hole end side, and promotes the hydration reaction from the first mouth side toward the hole bottom side. There is no risk of eruption, it is possible to generate cracks in a short time, and the expansion and breaking force is strong, so crushing work can be carried out effectively. The following two inventions will be explained in detail with reference to the drawings.

1st. FIG. 2 is a sectional view showing an example of crushing construction of a concrete structure according to the present invention.

Filling holes 2 drilled in the concrete structure 1 are filled with expanded crushed material slugs IJ-3 and 3'. At this time, slurry 3' undergoes hydration reaction faster than slurry 3 by changing some or all of the reaction factors (particle size of expanded crushed material, temperature of kneading water, water content ratio, etc.) between slurry 3 and slurry 3'. Adjust to accelerate. That is, compared to slurry 3, slurry 3' has a smaller particle size of the expanded crushed material, a smaller proportion of the reaction retarder (1, a higher temperature of the kneading water), a lower water content ratio, etc. In detail,
Assuming that the water content of the slurry 3 is 25%, the slurry 3' is filled with a water content of 22 to 20%. In addition, as shown in FIG. 2 (as shown in FIG. 2), when filling the filling hole 2' drilled in the concrete structure 1' with a capsule 4 filled with an expanded crushing material, immersing it in a water pail 5 to absorb water, the capsule 4 Since the water content ratio of is approximately proportional to the time of immersion in the water pail 5, the capsules 4a are packed later than the capsules 4a, which are packed into the hole bottom side, so that the hydration reaction starts faster on the mouth side 6' than on the hole bottom side 7'. 41) By shortening the water immersion time and further making the capsule 4C shorter than the capsule 4b, the water content ratio can be adjusted to be higher on the hole bottom side 7' and lower on the first hole side 6'. Adjustment by the temperature of the kneading water If this is the case, the temperature at the mouth of the hole should be higher than the temperature of the kneading water or water immersion at the bottom of the hole.

As described above, according to the filling method of the expanding crushing material used for cracking an old body or concrete structure according to the present invention, the slurry 3. a'f
The capsules 4a, 4b4C have different reaction factors, and regarding the water content ratio mentioned above, the mouth side 6, 6' of each filling hole 2, 2' has the lowest water content ratio, so the mouth side 6°6 ' first accelerates the hydration reaction, solidifies and expands to close the mouth side 6, 6', and serves as a stopper. At this point, the hydration reaction in the parts other than the vicinity of the 8th mouth side 6, 6' has not reached a high temperature, but the heat generated by the reaction acceleration on the 2nd mouth side 6, 6' causes the slurry near the mouth side 6, 6' to heat up. Heating accelerates the two reactions, and the high-temperature hydration reaction is transmitted sequentially like a chain reaction (Thus, unlike conventional construction methods, no slurry spout occurs, and the expansion pressure is applied to the free surface 8. , 8' is generated from the mouth of filling hole 2.2'.

The destructive force is strong and effective as it advances toward the hole's end.

Furthermore, the filling method of the present invention is also effective when it is desired to promote the reaction and generate cracks immediately after filling the slurry. There is no risk of gushing (this is because the hydration reaction can be reliably promoted from the mouth).
As in the rapid crushing method for concrete structures using expanded crushing materials, quicklime is filled at the mouth of the filling hole, and the heat of the hydration reaction of the quicklime raises the temperature of the slurry at the mouth, resulting in a chain reaction. It is sufficient to promote the hydration reaction toward the pore end. If the hole diameter is large, as shown in Figure 3, after filling the slurry, use any method such as filling the hole with quick-setting cement mortar 9 to a slightly deeper hole. If the hydration reaction is accelerated by heating, the hydration reaction will immediately proceed toward the hole end. In this case, the necessary condition is that unless the calorific value of the slurry in each part of the filling hole is even slightly higher than the endothermic amount, the reaction will not proceed toward the end of the hole. The concentration is high, and the concentration on the mouth side needs to be higher than on the hole bottom side.

According to the invention as is clear from the above description.

Cracks occur much faster in the natural reaction state of the filled slurry than in conventional methods, and there is no risk of slurry spouting after filling the slurry.

It is safe and reliably effective even when it is desired to generate cracks immediately.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing an embodiment of the method for crushing concrete structures according to the present invention. FIGS. 3 and 4 are cross-sectional views showing other embodiments of the present invention. 1.1-] Concrete structure 2.2I, zI... Filling hole 3.3I...・・・・・・・・・ Sura'
)-4, 4a, 41), 4C-capsule 5...
・・・・・・・・・・・・・・・ Water pail 66'...
...... Mouth 1 side 7.7'...
・・・・・・・・・・・・ Hole bottom side 8.81・・・・・・
・・・・・・・・・Free surface 12・・・・・・・・・・
・・・・・・Pipe 13・・・・・・・・・・・・・・・
...Heating body Fig. 1': $ 2 Fig. 3 Fig. 41 concave

Claims (1)

[Claims] In a destructive construction method in which cracks are generated in an old body or concrete structure by the expansion pressure generated by the hydration reaction of the expanded crushed material, when filling holes made in the old body or concrete structure with a slurry of expanded crushed particles. In order to accelerate the hydration reaction of the slurry on the mouth side of the filling hole compared to the slurry on the hole end side, the reaction factors of the expanded crushed material slurry (compounding of the particle 1 reaction retardant of the expanded crushed material, temperature of the kneading water, water content ratio)
1. A method for filling an expanded crushing material used for crushing cracks in old bodies or concrete structures, which is characterized by filling a slurry with adjusted conditions.