JPH09228361A - Soil cement continuous wall construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water permeation construction method of a retaining wall, by which a continuous wall can be simply constructed with the low cost, the water can be passed at an arbitrary place between the upper and lower parts of the retaining wall, and the water can be passed between the both side layers of the retaining wall enough. SOLUTION: The discharge ports 22a of the pipes 22 for discharging the consolidification material such as cement milk and the like, are formed in the midway of a drilling shafts 5a, 5b located outside of a multiple spindle excavating machine 9 as a soil column erecting machine with its discharge ports 22 directed sideways. Then the drilling is performed in a condition that the ends of the preceeding element α and the following element β are not completely lapped, and only the drilled holes on the drilling shaft having a drilling locus outside, are partially overlapped, and the consolidification material is discharged from the discharge ports 22a to the periphery of the overlap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil-cement continuous wall construction method for constructing, for example, a pillar type underground continuous wall as a retaining wall or a waterproof wall in foundation work in the fields of construction and civil engineering. is there.

[0002]

2. Description of the Related Art In situ soil mixing method (SMW method) is known as a conventional soil cement continuous wall method.
This is carried out using a multi-shaft kneading auger machine 1 as shown in FIGS. In the figure, reference numeral 2 denotes a base machine having a leader mast 3. The multi-axis kneading auger machine 1 is suspended from the leader mast 3, and a parallel excavation shaft 5 connected to a drive unit 4 is a screw 6 which is a moving wing. And a horizontal blade-shaped kneading blade 7.

[0003] When drilling a ground with such a multi-axis kneading auger machine 1, a solidified material suitable for the purpose, such as cement milk, bentonite liquid, etc., is discharged from a drilling head 8 at the tip of a drilling shaft 5 and is excavated in the soil. Mixing with the in-situ soil, kneading and kneading the wall of one element to form a soil cement wall in-situ. Next, as shown in FIG. 11, the leading element α and the trailing element β completely overlap the excavation trajectories (A and C in the drawing) of the excavation axes located outside, thereby forming a continuously integrated wall body. .

The deeper the excavation length is, the more likely the excavation by the multi-screw kneading auger machine 1 is to produce a bend. Even if the excavations are intended to be overlapped with each other, only a slight overlap can be obtained if there is a bend, and in an extreme case, there is an overlap. Since some parts do not match, in the leading element α and the trailing element β, the excavation is advanced so that the excavation loci (A and C in the figure) of the excavation axes located outside at least as described above completely overlap, Even if it bends to some extent, there is no overlapping part so as to ensure the waterproofness.

[0005]

However, in order to form a continuous and integral water blocking and retaining wall as described above, the leading element α and the following element α are required to completely wrap the ends of the respective elements. However, the excavation of one of the excavating shafts located outside is completely wasted, the workability is poor, and the construction cost rises.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to reduce the overlapping portion as compared with the case where the overlapping portion completely wraps the end portion. Moreover, it is an object of the present invention to provide a soil-cement continuous wall construction method capable of forming a water-stopping / mounting retaining wall which does not have a risk of water leakage by preventing an imperfect portion of water-stopping.

[0007]

In order to achieve the above object, the present invention is to pour a solidifying material such as cement milk in the middle of an excavating shaft located outside a multi-spindle excavator as a soil columnar placing machine. The outlet of the pipe to be discharged is provided to the side, and the leading element and the trailing element do not completely overlap the ends of each element, and the excavation locus is located outside the Excavating so as to partially overlap, and discharging the solidifying material from the pouring outlet around this overlap, and connecting these bearings in the middle of the parallel excavating shafts of a multi-spindle excavator. And a curved guide plate is provided on both left and right sides of the connecting bearing portion,
The gist of the pipe for pouring out the solidifying material such as cement milk is to open on the outer peripheral surface of the curved guide plate.

According to the first aspect of the present invention, when constructing the trailing element, cement milk or the like is introduced from a pouring port provided laterally in the middle of the excavation shaft located outside the multi-spindle excavator. If there is no overlap between the leading element and the preceding element by pouring out the binding material, the binding material will be between the leading element and the trailing element or around the overlap if it is extremely thin. Can penetrate as a new injectate to enhance the water blocking property and make a water blocking wall without water leakage.

According to the second aspect of the present invention, since the solidifying material such as cement milk is provided with the curved guide plates on both the left and right sides of the coupling bearing portion and is poured out from the spout opening on the outer peripheral surface, The guide plate forces the permeation direction to go out of the overlap plane.

Further, when excavating a multi-axis excavator, the curved guide plate acts as a guide, so that the overall straightness can be maintained, and the bent element can be maintained more accurately with less bending, so that the leading element can be maintained. And the subsequent element can be made more solid.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a soil cement continuous wall method according to the present invention, and FIG. 2 is a perspective view of a main part of the same.

[0012] The multi-shaft excavator 9 is provided with a
In the case of a three-axis excavator lined with three a, 5b, 5c, the parallel excavation shafts 5a, 5b, 5c are provided with screw blades 10 of about half a pitch discontinuously at intervals above and below. .
The screw blades 10 are arranged obliquely in the vertical direction between the excavating shafts 5a, 5b and 5c, and the excavating shafts 5a and 5c are in the same direction, and the excavating shaft 5b is the excavating shafts 5a and 5c.
And project in the opposite direction. In addition, the tips of the screw blades 10 on the adjacent excavation shafts overlap in a vertical relationship.

The digging shaft 5a rotates forward, the digging shaft 5b rotates reversely, and the digging shaft 5c rotates forward. Although not shown in the figure, the digging shaft 5a is extended upward if necessary.
Is connected to the driving device 4 provided in the base machine 2 as shown in the conventional example. Also, the excavating shafts 5a, 5b, 5c
An excavating head 14 is provided at the tip of the device via a coupling 13. In the figure, reference numeral 12 denotes a connecting band for binding the excavating shafts 5a, 5b, 5c.

The excavating shafts 5a, 5b, 5 arranged in parallel in this way
These connecting bearings 20 are arranged in the middle part of c, and curved guide plates 21 extending in the vertical direction are provided on both left and right sides thereof. The connecting bearing portion 20 is also made of a plate body color that can be divided into two.

Further, a spout 22 of a pipe 22 for pouring a solidified material such as cement milk into both left and right sides of the connecting bearing portion 20.
a was provided. The spout 22a is opened on the outer peripheral surface of the curved guide plate 21 so as to discharge the consolidated material to the side. Also plumbing
22 rises along the side of the inner excavation axis 5b,
22 itself is non-rotating.

The excavating shafts 5a, 5b, 5c are simple rods without screw blades above the connecting bearing portion 20. The position where the connecting bearing portion 20 on which the curved guide plate 21 is provided is attached to the excavating shafts 5a, 5b, 5c.
Either the portion having the screw blade 10 or the simple rod portion having no screw blade may be used.

In this manner, the earth and sand cut by the bit of the drilling head 14 is mixed with a solidifying material such as cement milk poured out from the tip of the drilling head 14 by the stirring action of the rotation of the screw blade 10, and the soil cement is removed. Column rows can be formed.

When the succeeding element β is constructed with respect to the preceding element α, as shown in FIG. 4, the excavation trajectory is excavated so that only a part of the excavation hole in one excavation axis located on the outer side is overlapped. Then, it is possible to perform rational construction with less wasteful portions compared to the case where the overlapping portion completely wraps the end portion.

In addition to this, the spout 22 of the connecting bearing 20
By pouring a cement material such as cement milk from both sides in the left and right directions, the following element β bends with respect to the preceding element α as shown in FIGS. If not present, or if thin, this consolidation material can penetrate around it, increasing water blocking and creating a water blocking wall without water leakage.

Further, the pour of the consolidated material from the spout 22a is performed by sending compressed air from a compressor to the pipe 22,
Discharge by applying pressure. This ensures permeability.

Further, when the curved guide plate 21 is provided, the cementing material such as cement milk is forced in the penetrating direction by the curved guide plate 21, so that it can be effectively permeated without escaping inward. .

In excavation, the curved guide plate is used.
Since the 21 functions as a guide, the overall straightness of the excavation posture of the multi-axis excavator 9 can be maintained more accurately, and the water stopping performance is higher.

FIG. 8 shows a second embodiment of the present invention, in which the outer excavating shaft 5a among the excavating shafts 5a, 5b, 5c.
The iron part 11 is provided in a and 5c. The ironing portion 11 has a curved pressing surface 11a that rises along the shaft from the upper surface position of the screw blade 10, and the screw blade 10
Overhang to the position of the rotation trajectory of the outer edge of. This iron part
Numeral 11 is a thick-walled blade itself, and is arranged vertically at equal intervals in the axial direction, but the overhang is made to gradually increase along the rotation direction.

The excavating head 14 at the tip of the excavating shafts 5a, 5b, 5c is also provided with a soldering portion 11 in addition to the screw blade 15.

The earth and sand cut by the bit of the excavating head 14 is transported upward by the lifting action by the rotation of the screw blade 15.
At the position of 14, it is compacted to the hole wall by the iron part 11.

Further, the portion above the excavating head 14 is transported upward by the lifting action of the turning of the screw blade-shaped iron portion 11, and is pushed outward during this transport.
It is compacted to the hole wall. Further, the excavated earth and sand of the screw blade 10 and the consolidation material such as cement milk poured out from the tip of the excavation head 14 are stirred.

As described above, when excavating with the excavating shafts 5a, 5b, 5c, the excavated earth and sand is pushed outward by the iron portion 11 having a curved pressing surface that starts from the outer peripheral surface and projects outward.
It is compacted to the hole wall by the curved pressing surface 11a. And this iron part
Since 11 serves as a steady rest, the outer excavation axis can be inserted straight into the ground, so that there is no possibility that hole bending will occur even if there is no complete wrap between the preceding element and the following element as a whole. .

Furthermore, since the hole wall is compacted, the consolidation portion protects the hole wall, so that the rate of infiltration such as cement milk penetrating into the ground and losing it can be reduced.

[0029]

As described above, the soil cement continuous wall construction method of the present invention can reduce the overlapping portion as compared with the conventional case where the overlapping portion completely wraps the end portion.
Inexpensive and rational construction with less wasted parts becomes possible.

In addition, even if the overlapping portion is reduced, a water-stop / mounting wall which does not have a risk of water leakage can be formed by preventing an imperfect water-stop portion from occurring.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a soil cement continuous wall method according to the present invention.

FIG. 2 is a perspective view of a main part showing an embodiment of a soil cement continuous wall method according to the present invention.

FIG. 3 is a plan view of an essential part showing an embodiment of a soil cement continuous wall method according to the present invention.

FIG. 4 is a plan view showing an excavation locus.

FIG. 5 is a side view showing an excavation locus.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along line BB of FIG. 5;

FIG. 8 is a side view showing a second embodiment of the soil cement continuous wall method according to the present invention.

FIG. 9 is a side view of a conventional multi-axis kneading auger.

FIG. 10 is a front view of a conventional multi-axis kneading auger.

FIG. 11 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Multi-axis kneading auger machine 2 ... Base machine 3 ... Leader mast 4 ... Drive device 5, 5a, 5b, 5c ... Excavation axis 6 ... Screw 7 ... Kneading blade 8 ... Excavation head 9 ... Multi-axis excavator 10 ... Screw blade 11 ... iron part 11a ... curved pressing surface 12 ... connecting band 13 ... coupling 14 ... excavating head 15 ... screw blade 16 ... iron part 16a ... curved pressing surface 20 ... connecting bearing part 21 ... curved guide plate 22 ... piping 22a ... note Exit

Front Page Continuation (71) Applicant 390010043 Suntec Co., Ltd. 6-4-19 Higashikasai, Edogawa-ku, Tokyo (72) Inventor Kaichi Nishiyama 2-13-3 Koyanagi-cho, Fuchu-shi, Tokyo (72) Inventor Kaku Koji 6-1-5-810 Oshima, Koto-ku, Tokyo (72) Inventor Kokomi 3-9-30 Tsujido East Coast, Fujisawa City, Kanagawa Prefecture

Claims (2)

[Claims] 1. A pipe spout for pouring out a solidifying material such as cement milk is provided sideways in the middle of an excavation shaft located outside a multi-screw excavator as a soil column driving machine. The leading element and the trailing element are excavated so that the end portions of the respective elements are not completely overlapped, and the excavation locus overlaps only a part of the excavation hole on the one excavation axis located outside, and Soil cement continuous wall construction method characterized by discharging solidification material from the spout to the periphery of this overlap. 2. A connecting shaft bearing portion is provided in an intermediate portion of parallel excavating shafts of a multi-spindle excavator, and curved guide plates are provided on both left and right sides of the connecting shaft bearing portion to solidify cement milk or the like. The soil cement continuous wall construction method according to claim 1, wherein the pipe through which the material is poured is opened on the outer peripheral surface of the curved guide plate.