JPH01153930A - Sinking method for conduit run - Google Patents

Abstract

PURPOSE:To facilitate burying construction and to reduce its cost by laying a pipe for solution water which has plural small holes bored at the bottom part of a digged groove, laminating water-soluble paper to specific thickness, forming a settlement layer, and arranging the conduit run thereupon. CONSTITUTION:A base bed 2 is formed of earth (sand) of good quality on the base of the digged groove 1, the settlement layer 3 is formed of the water-soluble paper thereupon, and a sheet (made of synthetic resin) 4 for prevention against water seasoning from above is laid thereupon; and the conduit run 5 is laid on its top surface, earth (sand) 6 is deposited nearby the peak of the conduit run, and earth 7 produced at the time of digging the groove 1 is deposited. Water injection pipes 10 are arranged horizontally at the lower part in the settlement layer 3 at right angles to the conduit run 5. The the solution water 9 in a water reservoir tank 8 is injected equally into the settlement layer 3 from the small holes through the pipes 10 to dissolve the settlement layer 3 and the solution water 9 which contains the water-soluble paper penetrates the base bed and its peripheral base to form a cavity below the conduit run 5. Then the laminate of the earth (sand) 6 and produced earth 7 sinks and the conduit run 5, therefore, sinks accordingly while displaced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of sinking a pipe in order to experimentally measure the displacement of the pipe caused by ground subsidence or the like.

[Prior art] When underground subsidence occurs due to earthquakes, conventional underground pipes suffer from displacement or cracks, which can cause leakage of water, gas, etc. flowing through the pipes. be.

Therefore, as a method for sinking a pipe in order to experimentally confirm or measure the sinking displacement caused by the pipe, two types of pipe sinking methods as described below are generally known.

(1) Jacket construction method Figures 5 and 6 are diagrams showing a method for sinking a pipeline using jackpots. An excavated groove 21 is formed at the bottom of the excavated groove 1 and is excavated to a predetermined length and depth. is vertically formed at a predetermined height; 22 is a plurality of jacks vertically arranged at predetermined intervals with a predetermined stroke on the upper surface of the base 21; 23 is the upper surface of the jack 22; R horizontally to
A plurality of sinking plates 2 are formed to have a predetermined length and have a width equivalent to the width of the substrate 21 placed on the substrate. A base bed is compacted and has a horizontal upper surface, 5 is a conduit having a predetermined length that is piped on the upper surface of the base bed 2, and 6 is a conduit 5 that is compacted to the vicinity of the top of the bone so that the upper surface thereof is Good quality soil or sand formed horizontally, 7 is soil generated during excavation of the excavation trench 1 that has not been compacted from the top surface of this good quality soil or sand 6 to the finished ground, 24 is soil that is deposited on the jack 22 from the ground. It is a hydraulic pipe.

According to the jacking method configured as described above, by contracting the stroke of the jacking 22 via the hydraulic pipe 24 after completion of the burial work, the sinking plate 23 placed on the upper surface of the jacking 22 is moved downward. As a result, the base 2, good quality soil or sand 6, and generated soil 7 layered on the settling plate 23 collapse, and at the same time the pipe F! +5 causes a subsidence displacement.

(2) Suspended bed sinking method Figures 7 and 8 are diagrams showing a method of suspending and sinking a sinking board. is an approximately zero-shaped excavation groove, 21 is a base body erected at a predetermined height on the bottom peripheral edge of this excavation groove 1, and 23 is formed to have a width equivalent to the width of this base body 21 and a predetermined length. A plurality of sinking plates 31 are suspended at predetermined heights, and a plurality of wires 5 are arranged with one end fixed to the four corners of the sinking plate 23, for example, in order to suspend the sinking plates 23. 2 is a conduit piped at a predetermined position above the settling plate 23, 7 is soil generated during excavation of the excavation trench 1, which is deposited from the upper surface of the settling plate 23 to the finished ground, and 22 is the excavated soil on the ground. A plurality of jacks having a predetermined stroke in the vertical direction are installed in the vicinity of the end of the groove 1 at predetermined intervals, 32 is a plurality of large beams horizontally suspended on the upper surface of the jacks 22 perpendicular to the pipe 5, and 33 is a plurality of jacks having a predetermined stroke in the vertical direction; These are a plurality of small beams placed on the upper surface of the large beam 32 perpendicular to the large beam 32 and to which the other ends of the wires 31 are fixed.

According to the suspended floor subsidence construction method configured as described above, by contracting the stroke of the jack 22 after the completion of the burial work, the large beam 32, the small beam 33 and the wire 31
The sinking plate 23 descends through the sinking plate 23, and the generated soil 7 deposited on the upper surface of the sinking plate 23 collapses, causing a situation similar to ground subsidence caused by an earthquake or the like.
This causes a sinking displacement in the pipe line 5.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned jacking method, special techniques are required for planning the jack placement, etc., and time is also required for burial preparation. On the other hand, in the case of the suspended floor subsidence construction method, the equipment is large-scale, and there are problems such as requiring a large amount of cost for the equipment and installation.

This invention has been made to solve the above-mentioned problems, and aims to provide a method of sinking a pipe line that can be easily buried and at a low cost.

[Means for solving the problem] The above problem is caused by the base body, multiple sinking plates, jacks, etc. placed at the bottom of the pipe in the jacking method, and the multiple sinking plates placed at the bottom of the pipe in the suspended bed sinking method. The multiple large beams, small beams, jacks, wires, etc. installed on the board and the ground were abolished, and a pipe for dissolving water with multiple small holes drilled at the bottom of the excavated trench where the pipe is piped was installed. At the same time as piping, a subsidence layer is formed by stacking water-soluble paper to a predetermined thickness or water-soluble paper and sugar, salt, etc., and the pipe is piped on top of the subsidence layer and reaches the finished ground. deposit soil,
Thereafter, the problem is solved by supplying water for dissolution through a pipe in which a plurality of small holes are laid at the bottom of the excavation trench into which the pipe line is installed.

[Function] The method for sinking a pipe in the present invention is that water-soluble paper or water-soluble paper and sugar, salt, etc. are piped into the sinking layer formed at the bottom of an excavation trench in which the pipe is piped. By being evenly dissolved with dissolved water through the pipe, a situation similar to ground subsidence occurs in the pipe piped above the subsidence layer and the soil deposited up to the finished ground, and as a result, a situation similar to ground subsidence occurs. The pipe and the soil are submerged and the pipe is subjected to a subsidence displacement.

[Example] An embodiment of the present invention will be described below.

In FIGS. 1 and 2, 1 is an excavated trench formed, for example, in a roughly 7-shaped cross section with a predetermined horizontal width at the bottom, and is excavated to a predetermined length and depth, and 2 is this excavated trench. A base with a horizontal upper surface is formed by extending and compacting high-quality soil or sand to a predetermined thickness at the bottom of groove 1, and 3 is formed by stacking it on the top of this base 2 to a predetermined thickness. The water-soluble paper sinking layer 4 has a predetermined width and length that can be bent along the upper side at both sides of the excavated groove 1 laid on the top surface of the water-soluble paper sinking layer 3. A sheet made of synthetic resin, for example, for water intrusion prevention; 5 is a conduit having a predetermined length that is piped directly on the upper surface of the sheet 4 or at a predetermined interval; Good quality soil or sand whose upper surface is horizontal without being compacted; 7 is soil generated during excavation of the excavation trench 1 that has not been accumulated and compacted from the top surface of this good quality soil or sand 6 to the finished ground; 8 is a predetermined soil a water storage tank installed on the ground near the excavated trench 1 and having a volume of A plurality of water injection pipes 11 made of, for example, vinyl chloride or polyethylene are horizontally piped at predetermined intervals, perpendicular to the pipe line 5, along the side of the excavation groove 1 and below inside the sinking layer 3 of water-soluble paper. This is a valve disposed above the ground of this water injection pipe 10.

Figure 3 is a detailed diagram of the water injection pipe, water injection pipe 1.
0 is a water supply pipe 10a that has one end connected to the water storage tank 8 and the other end that extends to the top of the sheet 4, and one end that projects above the sheet 4 by a predetermined dimension and the other end that is the sinking layer of the water-soluble paper. The sprinkler pipe 10b is bent at the lower part of the inside of the pipe 3 and the final pipe end face is closed. , 10c is a plurality of small holes formed at predetermined intervals on the top or side surface of the water pipe 10b, 10d
is a connecting portion between the water supply vibrator 10a and the water sprinkling pipe 10b.

Next, the operation of the pipe sinking method configured as described above will be explained. After the burial work is completed, the valve 11 installed on the water injection pipe 10 is opened, and the dissolved water 9 in the water storage tank 8 is discharged.
By uniformly injecting water into the sinking layer 3 of the water-soluble paper through the water injection pipe 10, the sinking layer 3 of the water-soluble paper is dissolved in the dissolved water 9, and the dissolved water 9 containing the water-soluble paper is By infiltrating the base 2 and the surrounding ground, the pipe 5
At the same time as a cavity is formed in the lower part of the pipe 5, the layered layer of good quality soil or sand 6 and generated soil 7 sinks, and as a result, the pipe 5 sinks with a downward displacement.

In addition, the sinking layer 3 of the water-soluble paper may be formed as shown in FIG. 4. In FIG. 4, 12 indicates sugar or salt having excellent water solubility. It is laminated to a predetermined thickness within the sinking layer 3 of paper.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above embodiments. For example, a pump may be used for pouring the dissolved water 9, or
Modifications such as installing a pipe from the bottom of the water-soluble paper sinking layer 3 to the ground and draining water using a pump will be obvious to those skilled in the art and are within the scope of the present invention.

[Effects of the Invention] As described above, according to the present invention, a pipe for dissolving water with a plurality of small holes is installed at the bottom of an excavation trench into which the pipe is installed, and at the same time, the pipe is installed to a predetermined thickness. By configuring the structure so that the sinking layer formed by stacking water-soluble papers or laminating water-soluble paper and sugar, salt, etc. is dissolved through the pipe for dissolving water, the sinking layer is It is possible to subside the pipes installed at the top and the soil that has accumulated up to the finished ground in the same situation as ground subsidence, resulting in excellent effects such as cheaper equipment and no need for special technology. It is something that can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a pipe line according to an embodiment of the pipe sinking method of the present invention, FIG. 2 is a cross-sectional side view taken along the line ■-■ of FIG. 1, and FIG. A detailed Mi diagram of a pipe installed in a subsidence layer of a conduit in one embodiment of the conduit subsidence method, and FIG. 4 shows another embodiment of the subsidence layer in an embodiment of the conduit subsidence method of the present invention. Fig. 5 is a front view showing the pipeline of the conventional jack method, and Fig. 6 is a cross-sectional side view showing the line vt-vt in Fig. 5.
FIG. 7 is a front view showing a conduit in the conventional suspended bed subsidence construction method, and FIG. 8 is a cross-sectional side view taken along the line ■-■ in FIG. 7. 1... Excavation groove, 3... Subsidence layer of water-soluble paper, 5...
Pipeline, 6... Good quality soil or sand, 7... Generated soil,
9...Dissolved water, 10...Water injection pipe, 12...Sugar or salt.

Claims (1)

[Claims] In the pipe subsidence method when experimentally measuring the displacement of the pipe caused by ground subsidence, etc., water-soluble paper is piled up to a predetermined thickness at the bottom of the excavated trench in which the pipe is installed, or water-soluble Layering paper and water-soluble substances to form a sinking layer, piping the pipe above the sinking layer and depositing soil up to the finished ground, and then laying the pipe at the bottom of the excavation trench into which it will be piped. 1. A method for sinking a pipe, characterized by feeding water for dissolution through a pipe in which a plurality of small holes have been opened.