JP2006183779A - Baseless construction method for buried pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a baseless construction method for a buried pipe omitting foundation work, and not needing segmentation of back filling and rolling compaction of back filling material. <P>SOLUTION: In the construction method, trench digging is carried out, and the buried pipe is laid in a trench. It is characterized by that the buried pipe is positioned and installed in a separated state from a trench bottom face, and slurry stabilized treated soil is filled at once in the trench until a whole circumference of the buried pipe is hidden. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a foundationless construction method for buried pipes.

  Conventionally, the method of embedding pipes such as water pipes, gas pipes, sewage pipes, sheath pipes for signal cables, fiber cables (hereinafter referred to as “buried pipes”) in the ground is to cut the ground surface and bury the pipes. The trench method is widely known.

A general trench construction method will be described with reference to FIG.
After the earth retaining excavation is first performed, an aggregate such as sand is laid in layers, and then the foundation layer 20 is formed by compaction to prepare the foundation. (FIG. 4A)
Next, the buried pipe 6 is suspended and installed in the foundation layer 20 (FIG. 4B), the sand is backfilled around the buried pipe 6, and the wound layer 21 is formed by sufficiently compacting. (Fig. 4C)
Finally, the cut beam 11 is removed and the good quality soil is backfilled to form the landfill layer 22. (Fig. 4D)

The conventional trench method described above has the following problems.
<1> When the ground is soft, it is difficult to compact the foundation layer 20, and therefore the construction itself is very difficult.
<2> When the ground is soft, the ground expands due to rebound from excavation, and even if the buried pipe 6 is installed at a predetermined position, the expanded ground is compressed and sinks again during the backfilling operation. The tube 6 will also sink.
<3> Since aggregate and sand are water-permeable materials, it is difficult to permit construction when the location of the buried pipe is a riverbed or a bank.
<4> The backfilling material is loosened by the work of pulling out the retaining wall after backfilling, and settlement of the backfilled part and the surrounding road surface occurs.
<5> Conventionally, since the backfilling operation is performed a plurality of times, the construction period is prolonged.
<6> Since rolling work is required, problems such as noise pollution occur.

  In order to solve the above-described problems, the first invention of the present invention is a method of excavating a trench, laying a buried pipe in the trench, and filling it back, with the buried pipe separated from the bottom of the trench. Positioning is performed, and the slurry-stabilized soil is filled in the trench at a time until the entire circumference of the buried pipe is hidden.

  According to a second aspect of the present invention, in the non-foundation method for the buried pipe according to the first aspect of the present invention, a positioning device is installed to prevent the buried pipe from being lifted.

  According to a third aspect of the present invention, in the non-foundation method for the buried pipe according to the second aspect of the present invention, the positioning device is detachable.

According to a fourth aspect of the present invention, in the non-foundation method for an embedded pipe according to any one of the second to third aspects of the present invention, the positioning device includes a vertical hook that connects one end to the embedded pipe, It is characterized by comprising crossing rivets crossed and connected to the other end of the ridge, and obtaining a reaction force from the positioning device to prevent the buried pipe from being lifted.

The non-foundation method for the buried pipe of the present invention can obtain the following effects by means for solving the above-described problems.
<1> By attaching a positioning device to the buried pipe and positioning it so as to resist buoyancy, it becomes possible to use the slurry-stabilized soil for backfilling in the trench. Therefore, the slurry-stabilized soil excellent in fluidity can be efficiently filled into the entire trench at a time, and can be filled to every corner, thereby improving the workability.
<2> Since the slurried and stabilized soil is filled and hardened in the gap formed after the removal of the retaining wall, subsidence of the ground hardly occurs.
<3> The positioning device is simple and easy to handle, easy to install and remove, and can be diverted, so it is highly economical.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Positioning device First, main devices used in the present invention will be described. (Figure 1)
The positioning device 5 includes a vertical rod 3 and a cross rod 4, and the vertical rod 3 has an embedded tube holding portion 31 connected to the embedded tube 6 at the lower end, and the horizontal rod 4 is a screw type, a pin type or the like It has a known length adjusting mechanism 41 that enables expansion and contraction in the direction, and spikes 42 that form edges at both ends.
The vertical rod 3 and the transverse rod 4 are connected so as to cross each other via a connecting tool 8 such as a vertical clamp.

<2> Cutting process The retaining wall 2 is placed in the ground to form a region surrounded by the retaining wall 2. The said area | region is formed elongate along the earth retaining wall 2 of both sides, and excavation is performed and the trench 1 is formed. The trench 1 is excavated to such a depth that a buried pipe 6 can be installed, and an abdomen (not shown here) using a wire such as H-shaped steel is attached to the retaining wall 2 with a bolt or the like. Attach both ends of the beam 11 so as to press against the abdomen.

<3> Laying the buried pipe The buried pipe 6 is laid in a state separated from the bottom surface of the trench 1. In the laying method, a sandbag 91 is laid on the bottom of the trench, and the buried pipe 6 is laid thereon. (FIG. 2A)

<4> Installation of Crossing Spikes The spikes 42 are formed with edges at both ends of the crossing scissors 4, and the spikes 42 are respectively driven by hand hammers into the ground of the gap between the retaining walls of the trench 1. Then, using the length adjusting mechanism 41 provided on the crossing bar 4, the crossing bar 4 is extended in the longitudinal direction, and the spike 42 is pressed against the ground and fixed.
In addition, the transverse rods 4 can be positioned more effectively by installing them at regular intervals along the longitudinal direction of the buried pipe 6.

<5> Installation of vertical gutter and fixing of buried pipe The vertical gutter 3 is installed so as to intersect with the crossing gutter 4 using a connecting tool 8 such as an orthogonal clamp. The buried pipe holding portion 31 and the buried pipe 6 provided at the lower end of the vertical rod 3 are fixed. At this time, the buried pipe 6 is prevented from contacting the bottom surface 10 of the trench 1.
For fixing the vertical gutter 3 and the buried pipe 6, a well-known attachment method such as fixing the buried pipe holding portion 31 of the vertical gutter 3 to the buried pipe 6 using a binding material 32 is adopted.

  In addition, by connecting the buried pipe 6 to the vertical fence 3 while being suspended in the trench 1 with a crane or the like, the buried pipe 6 can be laid away from the bottom surface 10 of the trench without laying the sandbag 91. .

<6> Backfilling process After the buried pipe 6 is sufficiently positioned, backfilling is performed. At this time, the sandbag 91 used for installing the buried pipe 6 so as not to contact the bottom portion 10 of the trench 1 may be removed or left before being backfilled.
Slurry stabilized soil 7 is used for backfilling. (Fig. 2B) The slurry-stabilized soil 7 is rich in fluidity and self-hardening, so it fills and cures even in small gaps and hardly sinks the road surface. No pressure is required, leading to a shortened construction period.

  The slurry-stabilized soil 7 is also filled in the gap between the buried pipe 6 and the bottom 10 of the trench 1. When the slurrying stabilized soil 7 is filled in the gap between the buried pipe 6 and the bottom 10 of the trench 1, the buried pipe 6 receives buoyancy. However, the buried pipe 6 resists buoyancy by the positioning device 5 connected to the buried pipe 6, and the buried pipe 6 is firmly positioned without being displaced.

  In the above-described backfilling operation, the buried pipe 6 is firmly positioned and the compaction work is not required even if the backfilling is not performed stepwise as in the conventional construction method. Can be filled at a time until the entire circumference of the buried pipe 6 is hidden, and the construction period can be shortened.

<7> Demolition and removal process The retaining wall 2 and the cut beam 11 can be removed at any time from immediately after the slurry-stabilized soil 7 is backfilled until it is hardened to some extent. The treatment is performed after the treated soil 7 has hardened to some extent and the buried pipe 6 can withstand the buoyancy of the slurry-stabilized treated soil 7. (Figure 2)
If the retaining wall 2 and the cut beam 11 are removed under the above conditions, the treated soil is filled and hardened in the gaps after the retaining wall 2 is pulled out. Can be prevented.
The removed retaining wall 2, the positioning device 5, and the cut beam 11 can be diverted, and the economy can be increased.

As a second embodiment, the pile 9 may be placed on the bottom of the trench 1 to sandwich the buried pipe 6 from both sides (FIG. 3), or a sandbag may be installed instead of the pile 9.
In this example, since the pile 9 restrains the horizontal movement of the buried pipe 6, the buried pipe 6 can be positioned more firmly.

As a 3rd Example, the both ends of the crossing fence 4 can also be fixed and attached to a ground roadbed. In this example, the reaction force of the buoyancy received by the buried pipe 6 can be taken from the ground roadbed, and the buried pipe 6 can be prevented from rising.

The process drawing of the Example of the non-foundation construction method of the buried paddle of this invention. Sectional drawing of the Example of the non-foundation construction method of the buried paddle of this invention. Sectional drawing of the other Example of the non-foundation construction method of the buried paddle of this invention. Process diagram of conventional trench method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Trench 10 ... Bottom 11 ... Cut beam 2 ... Retaining wall 3 ... Vertical fence 31 ... Embedded pipe holding part 32 ... Bundling material 4 ... Crossing fence 41 ... Length adjustment Mechanism 42 ... Spike 5 ... Positioning device 6 ... Buried pipe 7 ... Slurry stabilized soil 8 ... Connecting tool 9 ... Pile 91 ... Sandbag 20 ... Base layer 21 ... Winding Standing layer 22 ... Landfill layer

Claims (4)

It is a method of excavating a trench, laying a buried pipe in the trench and backfilling,
Position and install the buried pipe away from the bottom of the trench,
A non-foundation method for buried pipes, characterized in that a slurry-stabilized soil is filled in a trench at a time until the entire circumference of the buried pipe is hidden.
In the foundationless construction method of the buried pipe according to claim 1, a positioning device is installed to prevent the buried pipe from being lifted up.
No foundation method for buried pipes.
The non-foundation method for buried pipe according to claim 2, wherein the positioning device is detachable.
In the non-foundation method of the buried pipe according to any one of claims 2 to 3, the positioning device includes a vertical gutter that connects one end to the buried pipe, and a cross gutter that is connected to intersect the other end of the vertical gutter. Characterized in that the embedded pipe is prevented from rising by obtaining a reaction force from the positioning device,
No foundation method for buried pipes.

Images