JP3295180B2 - Construction method of underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a continuous underground wall, and more particularly to a continuous wall method suitable for forming a deep earth retaining wall or impermeable wall by solidifying muddy water in a trench. is there.

[0002]

2. Description of the Related Art As a conventional continuous wall construction method by solidifying muddy water, generally, a rocking pipe is driven into the ground at regular intervals, and the muddy water in a trench is solidified with a solidifying agent by excavating a rocking pipe between the fixed pipes. A method of pulling out is being implemented.

[0003]

However, in the above-described method using a rocking pipe, the rocking pipe is pulled out about two days after the solidifying agent is cast in accordance with the strength of the solidifying agent. In the case of construction in a place where cars enter and exit sharply, it is impossible to set a power jack for pulling out the locking pipe continuously day and night, there is a problem in construction efficiency, and in order to take the reaction force of pulling out the locking pipe to the ground. When the locking pipe is pulled out near the place where the buried pipe such as a sewer pipe is buried, there is a problem that the buried pipe is easily damaged.

[0004]

According to the present invention, in order to solve the above-mentioned conventional problems, trenches 1 are excavated at constant intervals in the ground by a muddy water excavation method.
A plurality of pillars 3 made of shaped steel, and a rim 4 attached at a predetermined interval along the longitudinal direction of the pillars 3 so as to connect the pillars 3 at right angles to the front and rear surfaces thereof in a series. And a retaining frame 5 attached to the front and rear surfaces of the columns 3, 3 located at the left and right ends along the longitudinal direction thereof, and a steel corner attached between the tips of the columns 3, 3 located at the left and right ends. A flexible and waterproof partition sheet 7 attached between the cylinder 6 and the left and right stopper frames 5 on the front and rear surfaces of the pillars 3 located at the left and right ends, and the lower end attached to the square cylinder 6. , 7, and a flexible and waterproof partitioning bag 8 having a muddy water inlet 9 on the bottom surface and attached to the inner surface of the rectangular tube 6 with the bottom side positioned at the tip side of the rectangular tube 6. the core member 2, while flowing mud in the hollow portion of the partition core member 2 Kenkomi, partition core from the upper end of the partition core member 2 It proposes a method of constructing an underground continuous wall so as to solidify the internal mud by adding a mud solidification agent into the mud of the hollow portion of the.

[0005]

[Operation] The partition core member 2 includes column members 3, 3 located at the left and right ends.
And the front and rear partition sheets 7 and 7 form a hermetically-sealed hollow portion whose front end is closed by a partition bag 8. When this partition core 2 is built in the trench 1, Partition bag 8
The muddy water flows into the hollow portion from the muddy water inlet 9 on the bottom surface of the trench, and can be sunk smoothly without receiving buoyancy. Further, since the steel square tube 6 is attached to the tip, the inner wall of the trench at the time of construction It is durable against shocks and the like caused by contact with, and can be built safely.

[0006] Since the muddy water flowing into the partition core 2 is blocked from the external muddy water, if a muddy solidifying agent is added from the upper end of the partitioning core 2 to the muddy water in the hollow portion, only the internal muddy water is surely formed. Solidify.

After the muddy water in the partition core 2 of the adjacent trenches 1 and 1 has been solidified, the trenches 1 and 1 can be excavated as they are without the need for a step of pulling out a locking pipe as in the prior art. .

[0008]

EXAMPLES at regular intervals in the ground by the mud drilling method as shown in FIG. 1 and FIG. 9 excavated trench 1, the partition core member 2 forming a hollow plate shape in this trench 1, the partition
It is built while the muddy water flows into the hollow portion of the core material 2 .

As shown in FIGS. 2 to 8, the partition core member 2 is composed of a plurality of column members 3 made of a section steel such as an H-section steel, the web surfaces of which are arranged in parallel on the left and right sides, and these column members. A body edge 4 made of an angle steel material or the like attached at predetermined intervals along the longitudinal direction of the column 3 so as to connect the front and rear surfaces of the column 3 at right angles to each other, and columns 3 located at the left and right ends. A stop frame 5 made of an angle steel material or the like attached to the front and rear surfaces (flange surfaces) of the base member 3 along its longitudinal direction, and a square cylinder 6 made of a steel plate attached between the tips of the columns 3, 3 located at the left and right ends. And between the left and right retaining frames 5 and 5 on the front and rear surfaces of the pillars 3 and 3 located at the left and right ends, and the flexibility of a canvas sheet or the like having a resin-finished surface with the lower end attached to the square tube 6. The bottom surfaces of the partition sheets 7 and 7 and the inner surface of the A flexible and waterproof partition bag 8 attached to the end is attached, and the inside thereof is surrounded by pillars 3 and 3 positioned at the left and right ends and front and rear partition sheets 7 and 7. A hollow portion is formed, the tip of which is closed by a partition bag 8.

As shown in FIG. 7, the partition bag 8 is provided with a muddy water inlet 9 formed of a flexible cylinder projecting from the inside of the bag on the bottom surface thereof, and the bag opened to the hollow portion of the partition core 2. The peripheral portion of the opening is a pillar body 3 located at the inner surface of the rectangular cylinder 6 and at the left and right ends.
3 is mounted in a watertight manner at the tip.

As shown in FIG. 2, the partition core member 2 used when constructing a deep underground continuous wall is divided into a plurality of members along the longitudinal direction, for example, lower, middle and upper members. As shown in the figure, the pillars 3,
The three members are connected to each other by, for example, bolting with a joint plate 10.

In this case, as shown in FIG. 8, the partition sheet 7 of each divided member is formed to be slightly longer so that the end on the joint side slightly covers the mating member side. Are attached to a stopper frame 11 made of a steel material and attached to the column body 3 in the vicinity of the joint portion in a manner orthogonal to the joint portion so as to overlap with each other to secure the waterproofness of the connecting portion.

The left and right ends of the partition sheet 7 are covered with a protection plate 12 such as a steel plate attached to the retaining frame 5 to prevent damage due to contact with the inner wall of the trench at the time of construction.

When the partition core 2 constructed as described above is built in the trench 1, muddy water flows into the hollow portion from the muddy water inlet 9 on the bottom surface of the partition bag 8 at the tip (lower end) and receives buoyancy. It can be sunk smoothly without any trouble, and since the steel square tube 6 is attached to the tip, it has durability against impacts etc. due to contact with the inner wall of the trench at the time of building, and it is safe to build Can be included.

When the rectangular tube 6 at the tip of the partition core 2 reaches the bottom of the trench 1, the cylindrical muddy water inlet 9 is turned down and its mouth is closed, and the muddy water flowing into the partition core 2 is Since the muddy water is shielded from the external muddy water, the muddy water solidifying agent is added from the upper end of the partition core material 2 to the muddy water in the hollow portion to solidify the muddy water inside as shown in FIG.

The square core 6 at the tip of the partition core 2 is stabilized by slightly biting the bottom of the trench 1 into the bottom of the trench 1. By measuring the irregularity, cutting the lower edge of the square cylinder 6 in accordance with the irregular surface, and then erection, the entire lower edge of the square cylinder 6 is surely cut into the irregular surface to stably. It can be installed.

After the muddy water in each of the partition cores 2 of the adjacent trenches 1 and 1 is solidified, muddy excavation is performed between the trenches 1 and 1 as shown in FIG. The muddy water is then solidified by adding a mud solidifying agent to the muddy water in the same manner as described above to form a continuous integrated underground continuous wall.

[0018]

As described above, according to the present invention, the partition core material is watertightly surrounded by the pillars located at the left and right ends and the front and rear partition sheets, and has a hermetically sealed end closed by a partition bag. A hollow portion is formed, and when this partitioning core material is erected in the trench, muddy water flows into the hollow portion from the muddy water inlet on the bottom surface of the partition bag at the tip, and can be sunk smoothly without receiving buoyancy. In addition, since the steel square tube is attached to the tip, it is durable against impact due to contact with the inner wall of the trench at the time of building, and can be built safely.

Since the mud flowing into the partition core is blocked from the external mud, when a mud solidifying agent is added to the mud in the hollow portion from the upper end of the partition core, only the internal mud is solidified without fail. This eliminates the need for a conventional locking pipe.

Therefore, after the muddy water in the partition core material of the adjacent trench is solidified, the gap between the trenches can be excavated as it is without requiring a step of pulling out a locking pipe as in the related art.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state where a partition core material according to the present invention is built in a trench.

FIG. 2 is a front view of a partition core material according to the present invention.

FIG. 3 is a front view of a lower end member of the partition core member according to the present invention.

FIG. 4 is a longitudinal side view of a lower end member of a partition core according to the present invention.

FIG. 5 is a plan view of a lower end member of the partition core member according to the present invention.

FIG. 6 is a partially enlarged plan view of a main part of a partition core member according to the present invention.

FIG. 7 is a longitudinal sectional front view of a distal end portion of a lower end member of the partition core member according to the present invention.

FIG. 8 is a longitudinal sectional side view showing a connecting portion of a dividing member in the partition core member according to the present invention.

FIG. 9 is a plan view illustrating one embodiment of a step of the present invention.

FIG. 10 is a plan view showing another embodiment of the process of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trench 2 Partition core material 3 Column 4 Body edge 5 Stop frame 6 Square tube 7 Partition sheet 8 Partition bag 9 Muddy water inlet 10 Joint plate 11 Stop frame 12 Protective plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-81522 (JP, A) JP-A-61-98222 (JP, A) JP-A-47-20907 (JP, A) 295925 (JP, A) JP 48-17283 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/20 102

Claims (1)

(57) [Claims] A trench is excavated at regular intervals in the ground by a muddy water excavation method, and a plurality of pillars made of shaped steel are formed in the trench, and the pillars are orthogonal to the front and rear faces of the pillars. Are connected at a predetermined interval along the longitudinal direction of the column so as to connect them in series, a stop frame attached along the longitudinal direction to the front and rear surfaces of the column located at the left and right ends, and the left and right ends And between the left and right stop frames on the front and rear surfaces of the column located at the left and right ends, and the lower end is attached to the square tube. And a waterproof and waterproof partitioning sheet, and a flexible and waterproof partitioning bag having a muddy water inlet on the bottom surface and attached to the inner surface of the rectangular tube with the bottom side positioned at the distal end of the rectangular tube. While the muddy water flows into the hollow part of the partition core, Kenkomi, partition core from the upper end of the partition core material
A method of constructing an underground continuous wall, comprising adding a mud solidifying agent to mud in a hollow portion of a material to solidify mud therein.