JPS6133936B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for embedding a pipe.

A typical conventional method for management construction is to drive sheet piles constituting earth retaining walls into the ground prior to excavating trenches along the management construction route. The installation of sheet piles is often accompanied by vibrations and noise, and is subject to various restrictions at construction sites in urban areas and near residential areas. Furthermore, when sheet piles are used for earth retaining walls, they must be driven to a depth that exceeds the pipe installation depth in consideration of the depth of penetration, and the sheet piles are required to have considerable rigidity.

The purpose of the present invention is to solve various problems of the conventional method that requires driving sheet piles, and its characteristics are that a box is inserted into a trench that is excavated while filling it with muddy water, and The purpose is to define a space underground for management facilities.

The present invention places an assembly of a plurality of spaced sheet piles and a liquid-filled open-top box above the bottom of a ditch filled with muddy water, solidifies the muddy water, and then closes the box. draining the liquid from the box and removing the box, pouring concrete at the bottom of the space created by this, and after the concrete hardens, placing a pipe on the concrete;
A management installation method is then provided to fill said space.

In addition, the present invention arranges a box filled with liquid in a groove filled with muddy water, solidifies the muddy water outside the box, drains the muddy water in the box, and divides the box into upper and lower parts. The present invention provides a management installation method in which a pipe is formed in the lower part of the box or concrete is poured at the bottom of the box, and after the concrete hardens, a pipe is placed on the concrete, and then the space is filled.

The features of the invention will become apparent from the following description of the illustrated embodiment.

As shown in the cross section and longitudinal section in Figures 1 and 2, first, a guide wall 10 is installed along the management route, and then the groove hole 12 is excavated to a predetermined depth exceeding the pipe depth while filling it with muddy water. .

In a trench 12 filled with muddy water, a sheet pile and box assembly 14 is placed so that the box is located above the bottom 15 of the trench in order to divide the trench into two muddy areas. The assembly 14 includes vertical members 1 arranged in two rows on the left and right and spaced apart.
6 and a plurality of sheet piles 20 connected by transverse members 18, and an open top box 22 received between the two rows of sheet piles in close proximity to each sheet pile. The members 16 and 18 that connect the sheet piles 20 are arranged above the lower end of the sheet piles. The cross member 18 thus supports the box 22 in position above the lower end of the sheet pile.

The assembly 14 drains the muddy water in the slot 12 into a box 2.
2 to increase its weight and gradually descend through the slot until it reaches the position shown in FIGS. 1 and 2. In this arrangement, each row of sheet piles 20 is parallel to the wall surface 24 of the slot. Furthermore, since there is a gap between the sheet piles in each row, the muddy water surrounding the boxes 22 communicates through the bottom of the boxes and between the rows of sheet piles. Box 22
In addition to the muddy water in the ditch, other muddy water or fresh water can be used for the settling.

The sheet pile and box assembly 14 is pre-assembled on the ground, but the two can be separated by first lowering the interconnected sheet piles 20 into the trench 12 and then draining the mud or other water in the trench. The boxes 22 may be lowered between the rows of sheet piles by introducing liquid into them, thereby joining them in the slot.

After the sheet pile and box assembly 14 is placed in the slot 12, the muddy water outside the box 22 is solidified. This solidification can be achieved by various methods, for example, by removing mud from the top of the trench;
There is a method in which a solidifying agent such as cement or water glass is mixed with the slurry on the ground, and then the slurry is guided to the bottom of the trench, that is, near the bottom end of the sheet pile 20, where it is repeatedly discharged. In addition to a method of replacing the mud with mud that has been mixed and prepared, a method of using self-hardening mud for excavation and solidifying it over time can be used.

After the muddy water in the slot 12 has solidified, the muddy water in the box 22 is discharged, and the sheet pile 20 and its connecting member 1 are removed.
Box 22 is removed leaving 6 and 18 underground. Dump concrete 28 is placed at the bottom of the space created by this, that is, the space 26 with an open top defined by the solidified mud 27 and the sheet piles 20.
After the concrete hardens, the tubes 30 are placed in a predetermined direction and angle of inclination (see FIG. 3). If necessary for this work, stand up 3 times between 20 sheet piles.
2, and a strut 34 is placed between the raised ribs to reinforce the earth retaining wall made of the sheet piles 20. Solidified muddy water 2
Layer 7 has a low permeability coefficient of 10 ^-6 to 10 ^-7 , is highly watertight, and has high strength. Depending on the depth, the shoring including the above-mentioned uprights 32 and struts 34 may be unnecessary. but,
Of course, by providing this shoring, construction safety can be improved.

After the tube 30 is in place at the bottom of the space 26, the space is filled as shown in FIG. This is because muddy water conditioning and solidification equipment is provided at the work site, and the muddy water discharged from the box must eventually be disposed of, so muddy water stored in advance is supplied into the space 26 and the muddy water is stored here. Advantageously, the slurry is formed into a solidified material 36. This also provides a water-impermeable layer around the entire circumference of the tube 30, which is also advantageous. However, this filling is not limited to mud solidification, but may also be done by backfilling with earth and sand, such as earth and sand removed during trench excavation. The lower half, which completely fills the area, may be filled by mud solidification, and the remaining upper half may be filled by backfilling with earth and sand.

In addition, a plurality of sets of the sheet pile and box assemblies 14 described above are prepared, and after the muddy water in the box 22 has solidified, the slot 12 is extended, and the arrangement of the assembly 14 and the solidification of the muddy water outside the box are repeated each time. If the steps after discharging the muddy water in the box are then performed sequentially, the work efficiency can be further improved.

Next, referring to FIG. 5 showing another embodiment of the present invention, a box assembly 40 includes a box 42 for storing muddy water therein, and legs 44 and 45 attached to the bottom of the box. , and a substrate 46 attached to the legs. The legs 44 and 45 are spaced apart in the direction of extension of the slot so that when the box assembly 40 is placed in the slot 12 as shown, the muddy water surrounding the box 42 is communicated. . Instead, the legs 44 and 45 may be provided with appropriate through holes (not shown). box 4
2, the total height dimension is selected so that a water level higher than the mud water level in the trench can be maintained in consideration of buoyancy.

After placing the box assembly 40 in the slot 12 as shown, as in the previous embodiment,
The muddy water outside the box 42 is solidified, and then the muddy water inside the box is discharged. Thereafter, a tube is placed inside the box while the box assembly remains in the slot, and muddy water is again supplied into the box, where it solidifies and fills the inside of the box in which the tube is installed.

The box assembly 40 shown in FIGS. 6 and 7 includes a box consisting of a lower concrete box section 60 and an upper steel box section 62 connected to the lower box section. The side walls of the lower box portion 60 are thicker than the side walls of the upper box portion, and a stepped portion 64 is formed within the box due to the difference in thickness of the two side walls. This stepped portion 64 has
A rebar or stud belt 66 protrudes. Alternatively, a socket with an internal thread may be embedded in the stepped portion 64.

The box is inserted into the wire 56 so that its bottom 68 is above the bottom 15 of the slot, as shown.
It is suspended by the square timber 54. The box is filled with liquid, and the liquid is discharged after the muddy water outside the box solidifies, as in the previous example.

After that, the inside of the box is divided into two spaces, upper and lower. That is, a cover plate 70 made of concrete is placed on the step 64, and the cover plate 70 is attached to the lower part of the box by bending or bolting the reinforcing steel.
is connected to the lower box portion 60 to form a rectangular tube 72 as shown in FIG.

The upper part of the lid 70 inside the box is filled by backfilling with earth and sand or by injecting muddy water and solidifying it.

According to the present invention, generation of vibration and noise can be avoided without driving sheet piles into the ground during trench excavation. In addition, the sheet piles placed in the muddy water of the trench constitute an earth-retaining wall, but since the solidified mud interposed between the hole wall and the sheet pile can be expected to have an earth-retaining effect, the sheet piles used are conventional. There is no need for high rigidity, and the length of penetration can be short. moreover,
The pipe installation work can be carried out in a space covered with a layer of solidified mud, so there will be no trouble from spring water. Furthermore, since the completed pipe is covered all or most of its circumference with water-stopping solidified mud, water leakage inside and outside the pipe can be prevented.

[Brief explanation of the drawing]

1 is a cross-sectional view of a slot showing one of the stages of implementation of the method of the invention; FIG. 2 is a cross-sectional view taken along line 2--2 of FIG. 1; and FIG. 3 is a tube arrangement. FIG. 4 is a diagram similar to FIG. 3 showing the completion status of construction, FIG. 5 is a diagram showing another embodiment, and FIGS. 6 and 7 are still other embodiments. FIG. 10... Guide wall, 12... Groove, 14... Sheet pile and box assembly, 20... Sheet pile, 22... Box, 24... Hole wall surface, 26... Space, 27... Mud water solidification, 28... Concrete, 30... Pipe, 32... Lifting, 34... Strand, 36... Box filling (solidified muddy water), 40... Box assembly, 42... Box, 60... Lower box part, 62... Upper box part, 70... Lid plate, 72...Tube.

Claims (1)

[Claims] 1. An assembly of a plurality of spaced sheet piles and an open top box filled with liquid is placed above the bottom of a trench filled with muddy water, and the muddy water is solidified. and then draining the liquid from the box and removing the box, pouring concrete at the bottom of the space created by this, and after the concrete hardens, placing a pipe on the concrete, and then filling the space. management settings, including 2. The method according to claim 1, wherein, prior to placing the concrete, a rib and a strut are provided on the sheet pile to support the earth retaining wall by the sheet pile. 3. The method according to claim 1, wherein after the muddy water has solidified, the slot is extended, and the arrangement of the sheet pile and box assembly and the solidification of the muddy water are repeated. 4. The method of claim 1, wherein the space is filled by filling the space with muddy water and solidifying it. 5. The method according to claim 1, wherein the space is filled with earth and sand. 6. Claim 1, wherein the sheet pile and box assembly is settled and disposed in the slot by guiding muddy water in the slot into the box.
The method described in section. 7. Placing a box filled with liquid in a ditch filled with muddy water, solidifying the muddy water, draining the liquid in the box, pouring concrete at the bottom of the box, and after the concrete hardens. A management installation method comprising placing a pipe on the concrete and then filling the inside of the box. 8 Placing a box filled with liquid in a groove filled with muddy water, solidifying the muddy water, draining the liquid in the box, dividing the inside of the box into upper and lower parts, and then dividing the inside of the box into upper and lower parts. Administrative installation methods, including filling parts.