JP3561869B2 - Underground continuous wall construction method and groove wall protection plate - Google Patents

Description

[0001]
TECHNICAL FIELD The present invention relates to a method for constructing an underground continuous wall and a formwork for shore used for carrying out the method.
[0002]
[Prior art]
According to the conventional construction method of the continuous wall, when an underground wall (1 element) having a large width B of usually 7 to 10 m is to be constructed on the ground 1 as shown in FIG. The trench is dug with a wall excavator while stabilizing the trench wall. At this time, the excavation width (1 gut) that can be excavated at one time is b, and excavation of several guts is repeated to excavate the width B of one element. After the completion of digging for one element, slime treatment is performed, a reinforcing bar is laid, concrete is poured, and a wall is built.
[0003]
However, in such a series of operations, a trench excavation operation by a continuous wall excavator is performed by excavating in several guts per element, so that the excavation operation requires a lot of labor and time. In addition, such excavation work involves a lot of uncertainty in the process, so that the efficiency of the entire continuous wall construction work cannot be improved.
[0004]
For this reason, a chain saw type cutter device has been developed as one method of a trenching machine of the soil cement continuous wall method. In this method, a trench excavated by a chainsaw type cutter is filled with high specific gravity mud, a solidifying material such as cement is added to the mud, a core material is built, and a soil cement wall is built.
[0005]
According to this method, the trench excavation can be performed continuously and at a high speed. In addition, the excavation trench wall is held down by the mud having a high specific gravity and is stable, so that it can be continuously excavated. The length of the trench that can be dug is dramatically improved, and can be extended from several tens of meters to infinite length depending on the soil type.
[0006]
[Problems to be solved by the invention]
In the case of the conventional method of constructing a continuous underground continuous wall of reinforced concrete walls, the length of one trench excavation (one element) is about 10 m, and the construction is performed while repeating a series of steps of excavation, reinforcement construction, and concrete placement. Because of this, the utilization rate of machines used in each process was poor, and time was required for replacing machines. Moreover, in the soil cement underground continuous wall construction method, there is an advantage that a trench can be continuously excavated using a chain saw type cutter device or the like, but since the excavation trench is filled with high specific gravity mud, In such a case, it was impossible to insert a reinforcing bar in the trench or cast concrete, and it was impossible to construct a concrete wall with high quality reliability.
[0007]
In addition, the soil cement continuous wall method is a method of stabilizing the ground and building the soil wall by stirring and kneading the soil of the ground and the solidified material, and because the specific gravity of the mud in the excavation trench is high. It is a construction method that is excellent for the stability of the ground, but because it is a soil cement wall of the ground and solidified material, there is variation in strength, and the wall surface is uneven and the wall thickness is uneven, Further, the wall has low strength due to poor vertical accuracy.
[0008]
The present invention has been made to eliminate the above disadvantages.
[0009]
[Means for Solving the Problems]
The method for constructing an underground continuous wall according to the present invention includes a step of forming a groove by excavating the ground from one side to another while injecting a stabilizing liquid by a continuous wall excavator, and forming a high specific gravity mud in the groove. a step of separating the grooves while extruding toward the one from the other to the high specific gravity mud in the groove on the upstream side and the downstream side by the extruding device, the upstream groove in after the high specific gravity mud was partitioned extruded A step of supplying a low-density stable liquid therein, and partitioning both end surfaces of the upstream groove after the high-density mud is extruded and partitioning, and providing groove wall protection plates on both side walls on the upstream side. Laying, and placing concrete in the excavation groove portion to which the low specific gravity stabilizing liquid has been supplied; and, in the range of the length of the groove wall protection plate, the groove wall protection plate toward the downstream groove. Moving it.
[0010]
Further, the underground continuous wall construction method of the present invention is a step of forming a groove by excavating the ground from one side to the other while injecting a stable liquid by a continuous wall excavator, and forming a high specific gravity mud in the groove. above after the step of dividing the groove on the upstream side and the downstream side while discharging toward the one from the other to the high specific gravity mud in the groove, that the high specific gravity mud was partitioned discharged by the partition and mud eductor on the upstream side of the groove and the step of supplying a low specific gravity stabilizing solution, partition by partition plates both end faces of the upstream side of the groove after the high specific gravity mud was partitioned discharged, grooves in side walls of the upstream A step of arranging a wall protection plate, a step of placing concrete in the excavation groove portion to which the low specific gravity stabilizing liquid has been supplied, and a method of mounting the groove wall protection plate toward the downstream groove with the groove wall protection plate Moving over a range of length.
[0015]
The groove wall protection plate of the present invention includes an outer plate, a plurality of semicircular projecting portions provided in the inner surface of the outer plate in the longitudinal direction, and an inner plate disposed to face the outer plate. An outer serrated portion provided on the outer surface of the inner plate, the outer serrated portion being located corresponding to the inward serrated portion, one end of the inner serrated portion being a vertical surface, the other end being a slope, and One end of the serrated portion is a slope, and the other end is a vertical surface.
[0016]
The groove wall protection plate of the present invention is an outer plate, a plurality of mountain-shaped projecting portions provided in the inner surface of the outer plate so as to be spaced apart in the length direction, and an inner plate arranged to face the outer plate, It is characterized by comprising a mountain-shaped protruding portion provided on the outer surface of the inner plate and corresponding to the mountain-shaped protruding portion.
[0017]
Further, the groove wall protection plate of the present invention includes an outer plate, a plurality of semi-circular projecting portions provided on the inner surface of the outer plate so as to be spaced apart from each other in the length direction, and an inner plate arranged to face the outer plate. A plate and a semi-circular projecting portion provided on the outer surface of the inner plate and corresponding to the semi-arc projecting portion.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
In the present invention, as shown in FIG. 1, a trench 2 is excavated in a direction indicated by an arrow while injecting a stabilizing liquid into a ground 1 by a continuous wall excavator (not shown) to form a high specific gravity mud in the trench 2. Then, a partitioning and mud discharging device 3 is sunk from the back of the wall excavator into the excavation groove 2 and is caused to proceed while discharging the high specific gravity mud in the groove 2 in the same direction as the arrow, and the high specific gravity mud is discharged. The groove 2 is partitioned by a partition plate (not shown), and a low specific gravity stabilizing liquid such as water is supplied into the partitioned groove 4 while discharging high specific gravity mud, and both ends of a desired area of the partition groove 4 are connected. The partition walls 5 and 6 are used for partitioning, and a groove wall protection plate 7 is provided on both walls of the partitioned groove 4 as necessary, and is surrounded by the partition plates 5 and 6 and the groove wall protection plate 7. A reinforced basket 8 is put in the area where the concrete 9 has been placed, and concrete 9 is cast as shown in FIG.
[0020]
Next, the jack of the propulsion means 10 composed of, for example, a multi-stage jack is extended to take a reaction force on the concrete 9 cast as shown in FIG. 3, and the partition and mud discharging device 3 is pushed out in the direction of the arrow while the height is raised. The specific gravity mud is discharged, and is moved together with the groove wall protection plate 7 while the low specific gravity stabilizing liquid is injected into the groove 4 partitioned by the partitioning and mud discharging device. Backfill mortar 11 is injected into a gap formed after the groove wall protection plate 7 is pulled out, and the jack of the propulsion means 10 is shrunk in a state where the groove wall protection plate 7 is detached from the cast concrete 9. The steps of FIG. 1 and FIG. 2 are slightly repeated below.
[0021]
The partitioning and mud discharging device 3 has, for example, a high specific gravity mud separating and discharging means having a suction port for taking in high specific gravity mud on the front surface and a partitioning means on the rear surface.
[0022]
If the multi-stage jack of the propulsion means 10 cannot be stored in the partitioning and mud discharging device 3, as shown in FIG. A part may be stored.
[0023]
In addition, if the ground wall of the partition groove 4 is a ground in which the ground is stable without collapse by only the low specific gravity stable liquid, the groove wall protection plate 7 is unnecessary, but the ground is soft and the low specific gravity stable liquid is used. If the ground alone is not stable, the groove wall protection plate 7 can be used to reinforce the groove wall, and ground improvement and the like can be omitted.
[0024]
For example, as shown in FIG. 5, the groove wall protection plate 7 includes an outer plate 13, a plurality of inward saw-tooth-shaped portions 14 provided on the inner surface of the outer plate 13 in a longitudinal direction, and the outer plate 13. An inner plate 15 is disposed opposite to the outer plate, and an outward saw tooth portion 16 is provided on the outer surface of the inner plate 15 so as to correspond to the inward saw tooth portion 14. It is a vertical surface, the other end is a slope, one end of the outwardly sawtooth-shaped portion 16 is a slope, and the other end is a vertical surface.
[0025]
When the concrete is cast, the slope of the inward saw tooth portion 14 and the slope of the outward saw tooth portion 16 engage as shown in FIG. 5, so that the gap 18 between the outer plate 13 and the inner plate 15 is maximized. To do.
[0026]
When pulling out the groove wall protection plate 7, the inner plate 15 is moved relative to the outer plate 13 in the direction of travel so that the vertical surfaces of the inward and outward sawtooth portions 14, 16 as shown in FIG. In this state, the gap 18 between the outer plate 13 and the inner plate 15 is minimized, and the groove wall protection plate 7 can be easily pulled out.
[0027]
In another embodiment of the present invention, as shown in FIG. 7, the serrated portions 14 and 16 may be replaced by mountain-shaped projecting portions 19 and 20, and as shown in FIG. , 22.
[0028]
In this embodiment, when pulling out the groove wall protection plate 7, if the inner plate 15 is moved in the traveling direction relative to the outer plate 13, as shown in FIG. 9 or FIG. When the gap 18 between the inner plates 15 is minimized and the outer plate 13 and the inner plate 15 are simultaneously pulled, the groove wall protection plate 7 can be easily pulled out.
[0029]
Further, in the present invention, instead of using the above-mentioned partitioning and mud discharging device 3, for example, using a high-specific-gravity mud separating and extruding means having an extruding means for extruding high-specific-gravity mud on the front surface and a separating means on the rear surface, While extruding the specific gravity mud, the extruded high specific gravity mud may be discharged by a desired discharging means.
[0030]
【The invention's effect】
Since the method for constructing an underground continuous wall according to the present invention is as described above, the following effects can be obtained.
[0031]
(1) Since excavation can be performed continuously, the excavation speed is high and the construction cost can be greatly reduced.
[0032]
{Circle around (2)} Since the partitioning and mud discharging or extruding device is always immersed in the groove, the center of gravity is low and the work safety is high.
[0033]
(3) Since an excavator with high mechanical loss can be used continuously without waiting, the construction period can be shortened and the cost can be reduced.
[0034]
(4) When the ground is weak and lacks independence, the groove wall protection plate is used, so that no auxiliary construction method such as ground improvement is required, and the construction period and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view for explaining a method for constructing an underground continuous wall according to the present invention.
FIG. 2 is a plan view for explaining a method of constructing an underground continuous wall according to the present invention.
FIG. 3 is a plan view for explaining a method for constructing an underground continuous wall according to the present invention.
FIG. 4 is a plan view of another embodiment of a partition and mud discharging apparatus used in the method for constructing an underground continuous wall according to the present invention.
FIG. 5 is a plan view for explaining a groove wall protection plate used in the underground continuous wall construction method of the present invention.
FIG. 6 is a plan view for explaining a groove wall protection plate used in the underground continuous wall construction method of the present invention.
FIG. 7 is a plan view for explaining another embodiment of the groove wall protection plate used in the method for constructing an underground continuous wall according to the present invention.
FIG. 8 is a plan view for explaining another embodiment of the groove wall protection plate used in the method for constructing an underground continuous wall according to the present invention.
FIG. 9 is a plan view for explaining another embodiment of the groove wall protection plate used in the method for constructing an underground continuous wall according to the present invention.
FIG. 10 is a plan view for explaining another embodiment of the groove wall protection plate used in the method for constructing an underground continuous wall according to the present invention.
FIG. 11 is an explanatory view of a conventional underground continuous wall construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Groove 3 Partitioning and mud discharging device 4 Groove filled with low specific gravity stabilizing liquid 5 Partition plate of newly built continuous underground wall 6 Partition plate of existing built underground wall 7 Groove wall protective plate 8 Reinforcing cage 9 Concrete Reference Signs List 10 Propulsion means 11 Backfill mortar 12 Jack storage cylinder 13 Outer plate of groove wall protection plate 14 Inward sawtooth portion 15 Inner plate of groove wall protection plate 16 Outward sawtooth portion 17 Drilling groove 18 Spacing of groove wall protection plate 19 Mountain shape Projecting portion 20 Mountain-shaped projecting portion 21 Semi-arc-shaped projecting portion 22 Semi-arc-shaped projecting portion

Claims (5)

Excavating the ground from one side to the other while injecting a stabilizing liquid by a continuous wall excavator to form a groove, and forming a high specific gravity mud in the groove;
A step of partitioning the groove into an upstream side and a downstream side while extruding the high specific gravity mud in the groove from one side to the other by a partitioning and extruding device,
Supplying the low specific gravity stable liquid into the upstream groove after the high specific gravity mud is extruded and partitioned,
A step of partitioning both end faces of the upstream groove after the high specific gravity mud is extruded by a partition plate, and disposing groove wall protection plates on both side walls on the upstream side ,
A step of placing concrete in the excavation groove portion to which the low specific gravity stable liquid has been supplied,
Moving the groove wall protection plate toward the downstream groove within the range of the length of the groove wall protection plate. Excavating the ground from one side to the other while injecting a stabilizing liquid by a continuous wall excavator to form a groove, and forming a high specific gravity mud in the groove;
A step of partitioning the groove into an upstream side and a downstream side while discharging the high specific gravity mud in the groove from one side to the other by a partition and mud discharging device,
Supplying the low specific gravity stable liquid into the upstream groove after the high specific gravity mud is discharged and partitioned,
A step of partitioning both end faces of the upstream groove after the high specific gravity mud is discharged and partitioned by a partition plate, and disposing groove wall protection plates on both side walls on the upstream side ,
A step of placing concrete in the excavation groove portion to which the low specific gravity stable liquid has been supplied,
Moving the groove wall protection plate toward the downstream groove within the range of the length of the groove wall protection plate. An outer plate, a plurality of inward saw-toothed portions provided in the inner surface of the outer plate in the longitudinal direction, an inner plate disposed opposite to the outer plate, and the inner plate provided on the outer surface of the inner plate. An outward serrated portion positioned corresponding to the inward serrated portion, one end of the inward serrated portion is a vertical surface, the other end is a slope, and one end of the outward serrated portion is a slope, A groove wall protection plate, characterized in that the other end is a vertical surface. An outer plate, a plurality of mountain-shaped protruding portions provided on the inner surface of the outer plate in the longitudinal direction, an inner plate disposed opposite to the outer plate, and the outer plate provided on the outer surface of the inner plate. A groove wall protection plate comprising a mountain-shaped projecting portion corresponding to the mountain-shaped projecting portion. An outer plate, a plurality of semicircular arc-shaped protruding portions provided on the inner surface of the outer plate in the longitudinal direction, an inner plate disposed opposite to the outer plate, and an outer plate provided on the outer surface of the inner plate. A groove wall protection plate comprising: a semicircular projecting portion positioned corresponding to the semicircular projecting portion.

Images