JPS6238486B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mud water solidification method.

[Problems to be solved by conventional technology and invention]

The conventional mud solidification method uses hardening mud during excavation (Panasol method), uses non-hardening mud during excavation, and after the excavation is completed, water glass and cement are added to this mud. mix,
The main method is to convert it into hardening mud (KWI method).

In these methods, the content of the hardening agent in the mud becomes approximately uniform within the groove, so that a hardened body having approximately uniform strength is formed over the area (in the depth direction).
Therefore, when determining the formulation when the hardened body is to bear soil water pressure, it is necessary to adopt a formulation that focuses on the position that requires the most strength, and even when a lower strength is required, it is necessary to It has the disadvantage that it requires the use of a formulation that exhibits the strength of , making the construction uneconomical. Furthermore, if a part of the hardened body (near the bottom of the hole) bears the supporting capacity, it not only becomes even more uneconomical, but also may not be applicable if the strength of the hardened body itself cannot bear the supporting capacity. It had drawbacks.

[Means for solving problems]

The object of the present invention is to eliminate the above-mentioned drawbacks, to not only perform economical construction, but also to bear the burden of bearing capacity, and to further expand the scope of application of the muddy water solidification method.

That is, the gist of the present invention is to insert a tremi tube to the bottom of a trench excavated using non-hardening mud, and to first pour low-strength self-hardening mud with a low hardening agent content through the tremi tube. The non-hardening mud at the bottom of the hole is moved upward using the difference in specific gravity between the two muds, replacing it with self-hardening mud for low strength, and then passes through a tremi tube to replace it with self-hardening mud for high strength with a high hardening agent content. Self-hardening mud is sent to the bottom of the hole, and by utilizing the difference in specific gravity between each mud, the low-strength self-hardening mud and non-hardening mud are moved upward as they are, and the bottom of the hole is used for high-strength mud. The present invention resides in a mud water solidification method characterized by replacing the water with self-hardening mud to form a self-hardening mud layer with two or more stages of strength depending on the strength distribution in the depth direction. Unlike conventional construction methods, this method is effectively carried out by using non-hardening muddy water during excavation and replacing the muddy water with self-hardening stabilizing liquid during solidification (replacement method). That is, at the time of replacement, a tremor tube is inserted to the bottom of the hole, and the harden mud is sent into the hole using the tremor tube, and the harden mud is replaced from the bottom of the hole to the top.

[Effect]

In general, soil water pressure has a triangular distribution that increases as the depth increases, so in order to obtain the corresponding strength of the hardened body, the strength should be low in the upper part and high in the lower part. Furthermore, the strength of the cured product corresponds to the amount of hardening agent in the hardening mud, and the more hardening agent there is, the higher the strength is. Therefore, in order to obtain the strength distribution of the above-mentioned cured product using the substitution method, first prepare a low-strength formulation (low hardening agent content), then move on to high-strength formulation (high hardening agent content). I will change it to In this case, the low-strength materials and the high-strength materials will not be mixed during replacement. This is because the replacement method utilizes the difference in specific gravity, so the high-strength formulation that is sent in later has a large amount of curing agent and therefore has a high specific gravity. Therefore, hardening muds of high-strength formulations are always below those of low-strength formulations.

As described above, by the substitution method, it is possible to form cured bodies with different formulations (different strength expressions) in the depth direction.

Furthermore, if it is desired to significantly increase the strength at the bottom of the hole, mortar or concrete may be filled instead of hardening mud.

In addition, each of the formulations of the self-curing stabilizing liquid that exhibits different strength in the depth direction has two or more levels of strength depending on the strength distribution in the depth direction of the hardened body to be formed in the groove. Each formulation is adjusted individually.

[Examples and effects of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

As shown in Fig. 1, a tremor tube 2 is inserted up to the bottom of a trench hole 1 that has been excavated using non-hardening mud 3, and through this tremor tube 2, a low-strength self-hardening mud 4 is first inserted. , the non-hardening muddy water 3 at the bottom of the hole is moved upward and replaced with self-hardening muddy water 4 for low strength.

Subsequently, as shown in FIG.
The self-hardening muddy water 5 for high strength is inserted into the bottom of the hole through the hole.As a result, the self-hardening muddy water 5 for low strength and the non-hardening muddy water 3 move upward as they are, and the self-hardening muddy water 5 for high strength is inserted into the bottom of the hole. will be replaced with

Finally, as shown in FIG. 3, mortar or concrete 6 is inserted into the bottom of the hole through the tremor pipe 2 to solidify the roots of the groove.

In this way, the non-hardening stabilizing liquid 3 in the groove hole 1 is formed from the bottom side of the hole: a layer of mortar or concrete 6 with different strength expressions, a layer of self-hardening muddy water 5 for high strength, and a layer of self-hardening mud for low strength. This is replaced by a layer of muddy water 4, thus forming a hardened body with different strengths in the depth direction.

At that time, since the specific gravity of the low-strength self-hardening mud 4, high-strength self-hardening mud 5, and mortar or concrete 6 increases in this order, the replacement layers 4, 5, and 6 do not mix together. It is formed into a layered hardened body whose strength gradually increases toward the bottom of the hole.

[Brief explanation of the drawing]

The drawings all show examples of the present invention, and Fig. 1 is a state diagram in which the bottom of the hole is replaced with self-hardening muddy water for low strength, and Fig. 2 is a state diagram in which the bottom of the hole is replaced with self-hardening muddy water for high strength. Fig. 3 shows a state diagram in which the bottom of the hole is replaced with mortar or concrete. 1... Groove, 2... Tremi pipe, 3... Non-hardening mud water,
4... Self-hardening muddy water for low strength, 5... Self-hardening muddy water for high strength, 6... Mortar or concrete.

Claims (1)

[Scope of Claims] 1. A tremor tube is inserted to the bottom of a trench excavated using non-hardening mud, and through this tremor tube, low-strength self-hardening mud with a low hardening agent content is first fed. The non-hardening mud at the bottom of the hole is moved upward using the difference in specific gravity between the two muds, replacing it with low-strength self-hardening mud, and then passed through the tremi tube to high-strength self-hardening mud with a high hardening agent content. The muddy water is sent to the bottom of the hole, and by utilizing the difference in specific gravity between each muddy water, the self-hardening muddy water for low strength and the non-hardening muddy water move upward as they are, and the bottom of the hole becomes self-hardening muddy water for high strength. A mud water solidification method characterized by replacing mud with mud to form a self-hardening mud water layer with two or more stages of strength depending on the strength distribution in the depth direction. 2. The muddy water solidification method according to claim 1, wherein finally, mortar or concrete is introduced into the bottom of the hole through a tremi pipe to solidify the roots of the groove.