JPS59154215A - Construction work of underground continuous wall using polymer mud water - Google Patents

Abstract

PURPOSE:To construct an underground continuous wall without discarding used polymer mud water with degraded function by a method in which the recovered polymer mud water is mixed with water-granulated slag and cement and thus obtained curable sludgy mixture is placed into a pit. CONSTITUTION:A pit is excavated by an excavator 24 while injecting a polymer mud water 22 from a polymer mud water tank 12, and the mud water 22 filled in the pit 14 is recovered by a self-sand pump 16 into a mud water storage tank 27 or the mud water tank 12. A part of the mud water 22 recovered is mixed with water-granulated slag and cement, together with a curing accelerator or retarder as needed, in a mixing tank 18 to prepare a curable sludgy mixture 17. The mixture 17 is injected into the pit 14 by a tremie tube 26, the mud water 22 is replaced with the mixture 17, and the mixture 17 is hardened to construct an underground continuous wall.

Description

[Detailed Description of the Invention] This invention is particularly applicable to the Maki-tsuki earth method, in which a vertical hole is excavated without being filled with polymer mud in order to prevent the vertical hole from collapsing after excavation, and an underground continuous wall is formed. Constructing a $A wall that effectively utilizes polymer slurry without having to waste it]-Relates to the law.

When excavating the ground to construct underground structures etc. 4p, 51
In recent years, a method of constructing a continuous mud solidified wall of culm in the ground with an unconfined compressive strength of 5-50 K (I fee 1-/CI) has been in the spotlight in recent years.

Although various types of construction methods are available, generally the methods 1, 4, and 11 shown in the block diagram of FIG. 1 are adopted.

As shown in the figure, the construction method consists of the following steps: drilling a narrow/wide vertical hole in the ground while filling it with muddy water, and then filling the excavated vertical hole with hardening mud from the bottom. First, in the work of drilling a vertical hole, the width of the vertical hole is generally about 0.4 to 111I, and the length of the vertical hole to be excavated in one step is Zaha-=generally about 2-6m long-(,
The depth is about 30m to Kuma 5.

A part of the underground wall formed by pouring hardening mud into the approximately rectangular plate-shaped vertical hole excavated in the upper part of the σ route is called a panel, and this panel is called a panel. Second. By sequentially connecting with the third panel in the horizontal direction, a continuous underground wall is formed.When excavating the vertical hole, C1, in order to prevent the vertical hole from collapsing. During excavation, the vertical hole was filled with muddy water.

For this muddy water, it is normal to use 1 m3 of water (C~IC(
Up to 7 kg of carboxymethyl cellulose), clay (
The basic formulation is a maximum of 1.0 klll of bentonite, etc.), and a so-called polymer slurry is often used, in which τ preservatives, sludge prevention agents, etc. are added as necessary. Once a vertical hole sufficient to form the above panel has been excavated, the polymer mud is replaced by casting a hardening mud and then recovered to form the next panel. J
``,: In the past, the polymer slurry was diverted to the excavation of the second panel, but the polymer slurry was affected by soil and sand mixed in during excavation, the action of soil Bacteria X, or the cement in the hardening mud. Since it gradually deteriorates due to the contamination of l- and becomes unable to exhibit the required performance, the number of diversions is naturally limited to about 3ti11.

For this reason, in this construction method, the polymer mud whose performance had deteriorated was discarded and replaced with new polymer mud.

However, there were the following problems in disposing of polymer slurry with degraded performance.

However, polymer slurry with degraded performance cannot be dumped into rivers or oceans as it is because it contains polymeric compounds, and it is necessary to add a coagulant to achieve solid-liquid separation. In addition to the cost of transportation to these treatment facilities, the cost of disposal was enormous.

In addition, in the conventional construction method (2) above, the system for producing, supplying, and collecting polymer mud and the supply system for hardening mud must be completely separated from each other. There was also the problem that the workability of 7m was reduced.

This invention has been developed in view of the problems of the conventional construction methods mentioned above, and the purpose of this invention is to effectively utilize polymer slurry with degraded performance without disposing of it. Using muddy water (X-noko 1ya 1 continuous wall construction -■
It is there that provides the law.

In order to achieve this goal, this invention (underground) heavy H1
: C1 excavated vertical hole internal force 1 etc. in wall construction dimensions (91
1. Part of the polymer muddy water, water frame slag, and cement are combined with rlA at a constant Φ ratio, and a hardening mud is formed. By hardening it, panels are formed one after another, and at the same time, it is used as the hardening mud when cutting the ti iiiia vertical hole.
JC Rimmer muddy water and the same amount of new Poly7 muddy water sequentially? If a continuous underground wall is formed while supplying a mountain (14 signs will be removed).

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figures 2 and 3 show one embodiment of the present invention, and Figure 2 schematically shows the apparatuses used in this invention. , No. 3 I-miya 1 (It is a block diagram showing one culm of the Mako C invention.

First, a description will be given of the equipment σ)ll11 used to carry out this invention. )
qHI Its! Polymer to store muddy water?
-'jQ 77 (tank 12 and polymer mud water 1r in the excavated vertical hole 14 liJ t15!
A part of the pollin muddy water collected from 2 was taken out from 11'2,
To the cement 1, excavated earth and sand, clay, and if necessary, a hardening accelerator or a hardening agent are added and mixed to prepare a hardening slurry 17. In the case where the first mixing tank 10, the second mixing tank 18, and the can also be shared.

7j, 27 is the pump 1G- (recovery j-71
This polymer muddy water is stored poetically.
, di one, pour the polymer muddy water from the vertical hole 14]
ll''I-'l (2) The porin-mud water that has been pumped from the layer part to the vertical hole 14 is returned to the polymer mud water tank 12 (returned to the layer part I). It is desirable that the polymer slurry collected from the storage tank 27 is stored in the storage tank 27 and used for producing the curable slurry 17.

The reason for this is that F of the polymer muddy water filled in the vertical hole 14 is
Performance deteriorates faster in layered areas due to contamination with excavated soil, etc., but as will be described later, there is no problem even if polymer slurry with degraded performance is used in the practice of this invention. On the other hand, by returning the polymer mud sludge collected from the upper layer to the Borin mud tank, the performance of the mud water supplied from the polymer mud tank 12 during excavation of the vertical hole 14 can be maintained well. .

Next, a method of constructing a -C diaphragm wall using the above-mentioned apparatus will be explained.

Even in the method J3 according to the present invention, in order to prevent the collapse of the vertical hole 14 to be excavated, the excavator 24 excavates while injecting the polymer mud 22 from the polymer mud 112,
The polymer mud 22 filled in the vertical hole 14 is collected by the Cerno sand bomb 16 into the Borin mud tank 12 or the storage tank 27. The first panel is formed by replacing the curable slurry 17 with the tremie tube 2 (3) and polymer mud 22, and hardening the curable slurry 17. This is similar to the conventional example described above in that a predetermined underground continuous wall is formed by sequentially connecting the second and third panels laterally.

The present invention has the following features compared to conventional construction methods.

That is, the hardening slurry 170 forming the panel
In manufacturing, a part of the polymer mud 22 collected from the vertical hole 14 after the completion of excavation is applied to this, and the remaining polymer mud is combined with new polymer mud to excavate the next panel, that is, the second panel.

It is used for forming purposes. The above-mentioned hardening mud 17 is made by adding water frame slag and cement 1 to the collected polymer mud 22.
~ are mixed in a certain ratio, and then the clay is mixed with excavated soil, hardening accelerator, or hardening spreading agent as needed. Strength J5 and water permeability rI! etc. (varies depending on J, but to give an example, 1 m3 equivalent of recovered polymer slurry
C water frame slag and cement [to M! is 150~
300Kg, clay 30~801"l, excavated soil O~50
0 kg, curing accelerator or curing retarder 0-10 kg.

In this case, it is known that when the polymer mud 22 and cement are mixed, the polymer in the polymer mud 22 interferes with the hardening of the cement. There is a concern that even if it hardens, it will not have sufficient strength as an earth retaining wall or a water-blocking wall.However, the inventor of the present application was fully aware of this point and developed a multi-column experiment.

After conducting research and trial♀ (one mistake was made), the above-mentioned problem was solved by placing hardening agent and Borin-mud water 22 in which the water frame slag and cement were heated in a ratio of 8=2 to 6:4. C
This led to the completion of the present invention.

In other words, Table 1 shows Ben 1-nay 1-70 K CI and cement 1-based curing agent in 1000 β water at 200 K (
I hO what I got (No, 1), water, pent ± I 1~
is the same amount of cement 1 with 240K [added (
No. 2) is an underground continuous wall (・, N0
93 to No. 7 are ItI4 according to the two methods of the present invention.
In the underground continuous wall that was built, polymer mud water and pen 1 henai 1
~ (1000℃ and 70KQ, respectively, and the carbon l-based hardener is 200K (l and 240NiR), and the weight ratio of water frame slag and cement of this cement-based hardener is 8:2) This figure shows the measurement results of the unconfined compressive strength of each of the following.

[Table ■] As is clear from Table 1 above, the construction method according to this invention achieves I
The unconfined compressive strength of the constructed underground continuous wall was 2ε3.56 days later, in both cases, the strength was almost the same as that of the conventional method, and there were no problems with O-C when applied to the site.

In addition, No. 5, No. 6 of Table 1 shows the strength measurement results when excavated soil is mixed into the hardening mud 17.
It is possible to obtain high uniaxial strength, and hardenable slurry 17
It is also possible to eliminate the cost of materials and disposal of excavated soil.

Furthermore, N (1 and 7 in Table 1) indicate that it is possible to add a hardening accelerator such as potassium sulfate 11 to obtain high unconfined compressive strength. It is also possible to adjust the strength of the curable slurry 17 by adding a curing retarder such as a oxycarboxylic acid salt.

As described above, construction of an underground continuous wall using polymer mud according to the present invention]-d1 is a part of polymer mud collected from the vertical hole after excavation of the vertical hole, water frame slag, and cement 1-d1.
These are mixed together with a certain weight and precision to form a hardening slurry, which is then poured into the vertical hole (hardened to form a panel). The same amount of new polymer mud water as the above-mentioned polymer mud water used as the hardening mud was sequentially replenished, and an underground continuous wall was constructed from four pipes, and it was used for vertical excavation. By collecting polymer slurry and effectively using a portion of it as a material for hardening slurry, it is possible to dispose of polymer slurry as in the conventional method (in case of failure, ■ significant reduction in costs). transformation is done.

In addition, there is no need to dispose of polymer mud (and there is no problem of environmental pollution due to the treatment, disposal, or transportation of polymer mud as in conventional methods).

[Brief explanation of the drawing]

Figure 1 is a block diagram of a continuous underground wall constructed using two conventional methods. Figures 2 and 3 show an example of the trench construction method for an underground continuous wall using polymer mud according to the present invention.
FIG. 2 is a schematic diagram of the equipment, and FIG. 3 is a block diagram of the process. 10......First mixing tank 12...Polymer mixing tank 14...
...Vertical hole '16...Cell Nord Bomb 17.
...... Hardenable mud 18 ...... Second mixing tank 20 ...... Agitator 22 ...... Polymer mud water 24・・・・・・Excavator 26・・・・・・・・・1 Helemi Ichikan Special Applicant Hitobayashi Kumiyo Co., Ltd.
Rito dialect 1110
-Color Kenkij Figure 1 m

Claims (1)

[Claims] Fill the polymer mud with two liters, cut a narrow vertical hole in the ground from 13, replace the polymer mud in the hole with hardening mud, and harden to 11↑4 By avoiding hardening of the mud, a panel is formed in the vertical hole (2) and then the panel (5) is successively connected to the adjacent panels formed in the same manner as the panel to form a predetermined underground continuity. In the construction method for constructing the wall, the hardening mud was collected from the vertical hole using a portion of the muddy water and the water frame slag.
Mix at a small proportion of T and set the aggregated Jil-like material in the vertical hole and harden it (14). Add the same amount of new polyζ as the polymer slurry used as the hardening slurry.
A method for constructing a diaphragm wall using polymer muddy water, which is characterized by forming a diaphragm wall while sequentially replenishing non-muddy water.