JPH06313316A - Construction method for underground continuous wall - Google Patents

Abstract

PURPOSE:To smoothly carry out the erecting work of a partition core member, and to simplify work processes by erecting a partition core member being hollow plate-shaped inside a trench with muddy water flowing into its hollow part, and making it survive as it is. CONSTITUTION:Trenches 1 are excavated in the ground at fixed intevals by a muddy water excavating construction method. A partition core member 2 being hollow plate-shaped is erected in the trench 1. Muddy water is made to flow into a hollow part from a muddy water inflow port at the tip (lower end) of the partition core member 2. When the tip of the partition core member 2 attains the bottom of the trench 1, the muddy water inflow port is closed. Next, a muddy water hardener is added from the top of the partition core member 2 into the muddy water in the hollow part to harden the inside muddy water. Thus, since the partition member 2 is erected with the muddy water flowing into the hollow part, the partition core member 2 can be smoothly sunkly provided without the influence of buoyancy.

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 an underground continuous wall, and more particularly to a continuous wall construction method suitable for forming a deep retaining wall or a water 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 mud water, generally, rocking pipes are driven into the ground at regular intervals, and a mud excavation method is used to excavate the gap between them to solidify mud water in a trench with a solidifying agent, and then the rocking pipes are The construction method is designed so that it can be pulled out.

[0003]

However, in the construction method using the above locking pipe, the locking pipe is pulled out within about two days after the solidifying agent is placed in accordance with the strength development by the solidifying agent. When constructing in a place where vehicles come in and out heavily, it is not possible to set the power jack for pulling out the locking pipe continuously in the day and night, and there is a problem in construction efficiency, and the pulling reaction force of the locking pipe is taken to the ground. When pulling out the locking pipe 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]

In order to solve the above-mentioned conventional problems, the present invention excavates a trench 1 at a constant interval in the ground by a mud excavation method, and in the trench 1,
A plurality of pillars 3 made of shaped steel, and a furring strip 4 attached at predetermined intervals along the longitudinal direction of the pillars 3 so as to connect them in series at right angles to the front and rear surfaces of these pillars 3. A stop frame 5 attached to the front and rear surfaces of the pillars 3 and 3 located at the left and right ends along the longitudinal direction thereof, and a square tube 6 installed between the tips of the pillars 3 and 3 located at the left and right ends. , The left and right stop frames 5, on the front and rear surfaces of the pillars 3, 3 located at the left and right ends.
5, the partition sheets 7 and 7 having flexibility and waterproofness with the lower end attached to the rectangular tube 6, and the bottom surface side of the inner surface of the rectangular tube 6 positioned on the tip side of the rectangular tube 6, the bottom surface. Flexible and waterproof partition bag 8 having a muddy water inlet 9
The partition core material 2 composed of and is built while allowing mud water to flow into the hollow portion, and a mud solidifying agent is added to the mud water in the hollow portion from the upper end of the partition core material 2 to solidify the mud water inside. It proposes the construction method of the continuous underground wall.

[0005]

[Function] The partition core member 2 has pillars 3, 3 located at the left and right ends.
And a front and rear partition sheets 7 and 7 are surrounded in a watertight manner, and a sealed hollow portion whose tip is closed by a partition bag 8 is formed. When this partition core material 2 is built in the trench 1, Partition bag 8
The muddy water flows into the hollow part from the muddy water inlet 9 on the bottom surface of the tank, and it can be smoothly sunk without receiving buoyancy, and since the steel square tube 6 is attached to the tip, the trench inner wall at the time of construction It also has durability against impacts caused by contact with, and can be safely installed.

The muddy water that has flowed into the partition core material 2 is shielded from the muddy water outside the partition core material 2. Therefore, if 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, only the muddy water inside the partition core material 2 is surely discharged. Solidify.

After the muddy water in the partition core material 2 of the adjacent trenches 1 and 1 is solidified, the space between the trenches 1 and 1 can be excavated as it is, without the need for a pulling-out process of the locking pipe as in the conventional case. .

[0008]

EXAMPLE As shown in FIG. 9 and FIG. 9, trenches 1 were excavated at a constant interval in the ground by a muddy water excavation method, and a hollow plate-shaped partition core material 2 was provided in the trenches 1 for muddy water in the hollow portions. Build while inflowing.

As shown in FIGS. 2 to 8, the partition core material 2 is composed of a plurality of pillars 3 made of shaped steel such as H-section steel with web surfaces facing each other and arranged in parallel with each other, and these pillars. The front and rear surfaces of the column body 3 and the furrow 4 made of angle steel or the like attached at predetermined intervals along the longitudinal direction of the column body 3 so as to connect them in series, and the column bodies 3 located at the left and right ends. Stop frames 5 made of angle steel and the like mounted on the front and rear surfaces (flange surfaces) of 3 along the longitudinal direction thereof, and square tubes 6 made of steel plates mounted between the tips of the pillars 3, 3 located at the left and right ends. And the flexibility of a canvas sheet or the like whose surface is attached between the left and right stop frames 5 and 5 on the front and rear surfaces of the pillars 3 and 3 located at the left and right ends and whose lower end is attached to the rectangular tube 6 and the like. The bottom surfaces of the partition sheets 7 and 7 having waterproofness and the inner surface of the square tube 6 are It is composed of a partition bag 8 having flexibility and waterproofness, which is located at the end side and attached, and is surrounded by pillar bodies 3 and 3 at the left and right ends and front and rear partition sheets 7 and 7. A hollow portion whose tip is closed by a partition bag 8 is formed.

As shown in FIG. 7, the partition bag 8 is provided with a mud water inlet port 9 made of a flexible cylinder projecting to the inside of the bag on the bottom surface thereof and opened in the hollow portion of the partition core material 2. The peripheral portion of the opening is formed by the pillars 3, which are located on the inner surface and the left and right ends of the rectangular tube 6.
It is attached to the tip portion of 3 in a watertight manner.

As shown in FIG. 2, the partition core material 2 used when constructing a deep underground continuous wall is divided into a plurality of members, for example, a lower end member, an intermediate member, and an upper end member, as shown in FIG. As shown in Figure 3, the pillars of each member are
The three members are connected to each other by, for example, bolting them with the joint plate 10.

In this case, as shown in FIG. 8, the partition sheet 7 of each divided member is formed to be a little long so that the end portion on the joint side slightly covers the opposite member side, and when the member is connected, In the vicinity of the joint portion, they are attached to the stop frames 11 made of steel, which are attached to the columnar body 3 in an orthogonal manner so as to overlap each other, and the waterproofness of the connecting portion is secured.

The left and right ends of the partition sheet 7 are covered with a protective plate 12 such as a steel plate attached to the stopper frame 5 so as to prevent damage due to contact with the inner wall of the trench during installation.

When the partition core material 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 smoothly sunk without any trouble, and since the steel square tube 6 is attached to the tip, it has durability against shock due to contact with the inner wall of the trench at the time of construction and can be safely constructed. It becomes possible to be crowded.

When the rectangular tube 6 at the tip of the partition core material 2 reaches the bottom surface of the trench 1, the cylindrical muddy water inlet port 9 falls sideways to close the mouth, and the muddy water flowing into the partition core material 2 is Since it is shielded from external muddy water, a muddy water solidifying agent is added from the upper end of the partition core material 2 to the hollow muddy water to solidify the inner muddy water as shown in FIG.

The partition core member 2 bites the square tube 6 at the tip thereof into the bottom surface of the trench 1 to stabilize it. However, if the bottom surface of the trench 1 is largely uneven, the partition core material 2 is installed unstablely. By measuring the unevenness and cutting the lower end edge of the square tube 6 according to the uneven surface, and then building it, the entire lower end edge of the square tube 6 is surely bite into the uneven surface and stably. It is possible to install.

After the muddy water in each partition core material 2 of the adjacent trenches 1 and 1 is solidified as described above, muddy water is excavated between the trenches 1 and 1 as shown in FIG. After the mound is built, the muddy water solidifying agent is added to the muddy water in the same manner as above to solidify the muddy water to form a continuously integrated underground continuous wall.

[0018]

As described above, according to the present invention, the partition core material is surrounded by the columns located at the left and right ends and the front and rear partition sheets in a watertight manner, and the tip is sealed by a partition bag. When a hollow part is formed and this partition core material is built in the trench, muddy water will flow into the hollow part from the muddy water inlet on the bottom surface of the partition bag at the tip, and it will be possible to smoothly settle without receiving buoyancy. Since the steel square tube is attached to the tip, it has durability against impact due to contact with the inner wall of the trench at the time of installation and enables safe installation.

The muddy water that has flowed into the partition core material is blocked from the muddy water outside the partition core material. Therefore, when the muddy water solidifying agent is added from the upper end of the partition core material to the muddy water in the hollow portion, only the muddy water inside is solidified. It is possible to eliminate the need for a conventional locking pipe.

Therefore, after solidifying the muddy water in the partition core material of the adjacent trenches, it is possible to excavate between the trenches as it is, without the need for the step of pulling out the locking pipe as in the conventional case.

[Brief description of 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 material according to the present invention.

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

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

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

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

FIG. 8 is a vertical cross-sectional side view showing a connecting portion of divided members in the partition core material according to the present invention.

FIG. 9 is a plan view showing one embodiment of the process of the present invention.

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

[Explanation of symbols]

 1 Trench 2 Partition Core Material 3 Pillar 4 Body Edge 5 Stopping Frame 6 Square Tube 7 Partition Sheet 8 Partition Bag 9 Mud Water Inlet 10 Joint Plate 11 Stopping Frame 12 Protective Plate

Claims (1)

[Claims] 1. A muddy water excavation method is used to excavate trenches in the ground at regular intervals, and a plurality of pillars made of shaped steel are provided in the trench, and these pillars are orthogonal to the front and rear surfaces of these pillars. The furring edges attached at predetermined intervals along the longitudinal direction of the column body, and the stop frames attached to the front and rear surfaces of the column bodies located at the left and right ends along the longitudinal direction, and the left and right sides. It is possible to attach a steel square tube mounted between the tips of the pillars located at the ends and the left and right stop frames on the front and rear surfaces of the pillars located at the left and right ends, and attach the lower end to the square tube. A partition sheet having flexibility and waterproofness, and mounted on the inner surface of the rectangular tube with the bottom side positioned at the tip side of the rectangular tube,
A partition core material composed of a flexible and waterproof partition bag having a muddy water inlet on the bottom is built while allowing mud water to flow into the hollow part, and muddy water in the hollow part from the upper end of the partition core material. A method for constructing an underground continuous wall, characterized by adding a mud solidifying agent to solidify the mud inside.