JPH11323887A - Method for sinking pipeline and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and equipment for sinking a pipeline which dispense with trench timbering and have high efficiency in execution of work and which enable shortening of a term of works, improvement of safety and reduction of the cost of construction. SOLUTION: Backfilling sand 2 is filled immediately in an excavated trench 1 without constructing trench timbering therein. A traveling apparatus 6 is so provided as to bestride the excavated trench 1. The traveling apparatus 6 supports a fluidizing device 4 through the intermediary of an arm 7, and a jack for pressing the fluidizing device 4 into the backfilling sand 2 in the excavated trench 1 and pulling it up therefrom, a water storage tank, a vibration generator 8 and various power devices and others are mounted on the traveling apparatus 6. The fluidizing device 4 is constituted of a platelike body 4a having such pliability as to make it possible to wind it on an object to be sunk and settled, and to hold the object inside, and having a large number of small holes as jet ports 4b formed in the outer surface, and pipeline constituting members are sunk to a prescribed depth and settled, the backfilling sand 2 being fluidized by jetting water or air from the jet ports 4b. After the settlement, the fluidizing device 4 is pulled up, while the pipeline constituting members are left behind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a pipeline for use in laying a pipeline such as a gas pipe, a water pipe, and a sewer pipe, and an apparatus used in the method.

[0002]

2. Description of the Related Art Conventionally, a procedure for burying a pipeline in a digging work includes excavation of a trench for laying a pipeline, installation of a soil retaining structure such as a sheet pile, a bulge, and a girder, and installation of a pipeline component member into a trench. Hanging
It consists of processes such as joining, backfilling and compaction of earth and sand, and removal of earth retaining supports.

[0003] In particular, the earth retaining structure is indispensable in laying a pipe under a road in order to resist a passing vehicle load and earth pressure. In addition, it is implemented for the purpose of ensuring the safety of work inside the excavation trench even under the road.

[0004] Conventionally, pipe members are suspended in excavation trenches using equipment such as human power or cranes. Furthermore, sandbags, sleepers, concrete foundations, and the like are required for the excavated floor depending on the type of pipeline to be constructed.

[0005] In addition, when the pipes are to be joined in the excavation trench, soil retaining supports must be installed continuously.
After the temporary paving, the following day, re-digging and joining the pipelines are performed.

[0006]

In the conventional pipeline laying work as described above, the earth retaining work hinders the construction efficiency, requires a construction period, and is a major factor in cost increase.

[0007] Further, after the excavation and the earth retaining work are carried out, the pipe components are suspended and the joining is usually performed underground. There is a space problem.

Further, after the pipes are joined, backfilling is sequentially performed with sand or the like. However, it takes time and effort for many workers to perform rolling and water tightening to prevent settlement. The present invention is intended to solve the above-mentioned problems in the prior art, and eliminates the need for earth retaining work, improves construction efficiency, shortens construction period, improves safety, and reduces construction cost. It is intended to provide a submersion method and apparatus.

[0009]

According to a first aspect of the present invention, there is provided a pipeline burial method in which a pipe laying position is excavated in a groove shape, and then the excavation groove is backfilled with a backfill material, and the backfill material is jetted with a fluid. And the pipeline constituent members are sunk into the backfill material in a fluidized state.

[0010] In the case of the present invention, the above configuration eliminates the need for a shoring support, and immediately after excavation, the excavation trench is backfilled with backfill material to prevent collapse of the ground. In this case, the backfill material is basically filled at a height higher than the height that balances the active earth pressure of the ground, but other ground collapse prevention means can be used in combination.

As the backfill material, sufficient fluidization can be easily achieved by water flow, air flow, or the like, or by applying vibration, and after the pipe constituent members are settled and the device for fluidization and settling is removed. Those that can be compacted are desirable. As such a backfill material, river sand, washing sand, or earth and sand having a similar particle size distribution, which can be expected to have a compaction degree of 90% or more, is suitable. By such water tightening, conventional backfill
A compaction effect equal to or higher than the rolling pressure is obtained, which helps to prevent settlement.

Further, the fluid referred to in claim 1 means a liquid or a gas, and typically fluidizes the backfill material by jetting water or air into the backfill material. When water is used as the fluid, the used water can be reused using a pump or the like.

According to a second aspect of the present invention, in the pipeline burying method according to the first aspect, a fluidizing device having a large number of ejection ports for ejecting a liquid or a gas after backfilling the excavation trench with a backfill material. The present invention is limited to a case in which a liquid or gas jet is supplied from the jet port to the vicinity of a conduit member while penetrating into the backfill material in accordance with the subsidence of the member.

That is, a fluidizing device for fluidizing the backfill material penetrates into the backfill material in accordance with the progress of the subsidence of the conduit component, and the efficiency near the conduit component is improved. It can be fluidized well.

As the fluidizing device in this case, a tube or a band provided with an ejection port, or a combination of tubes is suitable. In this case, it is sufficient that the number of the ejection ports is large enough to eject a fluid such as water or air in the vicinity of the conduit member. Of course, a large number of jet ports may be provided over the entire length or a predetermined section of the tube or the band.

In addition, it is necessary to determine the direction and arrangement of the ejection nozzles in consideration of the adverse effect on the pipe constituting members due to the ejection of the water stream or the air stream. Such a fluidizing device is installed around a pipe component to be laid, and the backfill material around the pipe component is fluidized by adjusting the pressure and amount of a water flow or an air flow, and the pipe component is Can be sunk.

When the backfill material such as sand has insufficient moisture and is hardly fluidized by the fluidization device alone, cover the surface of the excavation groove with a plate or sheet-like coating before introducing the backfill material. It is conceivable to prevent fluid supplied to the backfill material from escaping, for example, to make the material easily fluidized. Further, by blocking the surface of the excavation trench with such a plate or sheet-like coating, an effect of preventing fluidization or collapse of the earth and sand constituting the ground can be obtained.

According to a third aspect of the present invention, in the pipeline burying method according to the first aspect, when the excavation groove is backfilled with the backfill material, a fluidizing device having a plurality of ejection ports for ejecting liquid or gas is formed. The case where it is installed inside is limited.

According to a second aspect of the present invention, the fluidizing device penetrates into the backfill material in accordance with the sedimentation of the conduit member. Is embedded in the backfill material.

In this case, the fluidizing device fluidizes not only the vicinity of the conduit member but also a wide range of the backfill material at the same time, and a plate body provided with a large number of jet ports or a large number of jets. A tube body or a band body provided with an outlet or a plate-like assembly of these is suitable.

After the pipeline is laid, the fluidizing device can be lifted to the ground while jetting fluid and applying vibration as required. In a fourth aspect of the present invention, in the pipeline burying method according to the first, second or third aspect, the backfill material is vibrated to promote fluidization of the backfill material.

When sand or the like is used as a backfill material, loosely clogged sand that is saturated with water undergoes liquefaction by vibrating, so that fluidization is promoted and a behavior close to a liquid is obtained. As shown in FIG.

It is to be noted that the fluidization of the backfill material can reduce the sedimentation resistance of the pipeline components, but the complete fluidization corresponds to the buoyancy corresponding to the specific gravity of the liquefied earth and sand, and the partial fluidization corresponds to the removal of the earth and sand. Receive resistance.

On the other hand, the submersion can be carried out by utilizing the own weight of the pipe member or the own weight of the device for submerging. Pressing means such as a jack for applying force is required. Such a pressing means may be attached to a fluidizing device or a submerging device, or may be a combination of a push rod and a patch plate provided on a conduit component, and a structure in which the push rod can engage with the patch plate. In this case, the pipeline constituent member can be moved up and down, left and right, and back and forth.

As described above, by moving the conduit member, the conduit member can be sunk at a predetermined position,
Positioning (centering) for connection and welding between the pipeline components can be performed.

According to a fifth aspect of the present invention, there is provided a pipe line burying method, wherein a pipe laying position is excavated in a groove shape, and then the excavation groove is backfilled with a backfill material, and the backfill material is fluidized by vibration, thereby forming a pipeline structure. The member is settled in the backfill material in a fluidized state.

As described above, depending on the ground conditions, a liquefaction phenomenon occurs by applying vibration to the backfill material, or a state close to liquefaction occurs, and fluidization is possible even without a jet of liquid or gas. is there. Claim 5 is a case where the fluidization is carried out only by the vibration and the pipeline constituent members are laid down.

However, in order to facilitate liquefaction or fluidization, a water-impervious sheet may be buried in the excavation groove before filling the backfill material, and a liquid such as water may be injected to create a saturated state. It is also possible to use a liquid or gas jet together. When a water-blocking sheet or the like is used, it is usually removed after the completion of construction, but for example, it is conceivable to use a material that easily deteriorates or disappears in the soil and remains in the ground.

According to a sixth aspect of the present invention, there is provided a pipe line burying method, wherein a pipe laying position is excavated in a groove shape, and then a backfill material mixed with a solidified material is filled in the excavation groove, and the conduit member is filled with the backfill material. Are deposited in the backfill material during the uncured, fluidized state.

This is because the method of embedding a ready-made pile
It is based on the same principle as laying ready-made piles into a solidified material such as cement milk and mixing it with earth and sand. Thus, the ground improvement effect can be obtained for the backfill material after curing.

A fluidizing device according to a seventh aspect of the present invention has a large number of jets for jetting a fluid, and supplies a jet of liquid or gas into earth and sand or backfill material within a range in which fluidization is generated from the jets. In the pipe line burying method according to any one of claims 1 to 4, it can be used to fluidize the backfill material. Also, in the case of claim 5, it can be used when utilizing a jet of liquid or gas in addition to vibration.

An eighth aspect of the present invention relates to the fluidizing apparatus according to the seventh aspect, wherein the jetting port is connected to a fluid supply source such as a tank on the ground by a hose or the like, and has a flexible hollow plate or hollow sheet. This is limited to the case where it is formed on one surface of the object and is configured to be wound around the object to be laid with the ejection port side as the outer surface.

Water and air are spouted from the spout while being wrapped around an object to be laid, such as a pipe component, so that the earth and sand or backfill material around the object to be laid is fluidized directly, resulting in efficient construction. Becomes possible.

Further, a vibration generator may be provided on the plate-like body or sheet to transmit vibration to surrounding earth and sand or backfill material, thereby promoting fluidization of the earth and sand or backfill material. Claim 9 relates to the fluidizing device according to claim 7,
The jet port is formed in a pipe connected to a fluid supply source, and the pipe is limited to a case where the pipe is supported by a submerging device or a support attached to an object to be submerged.

In this case, for example, one or several pipes are arranged in parallel with the object to be laid, such as a pipe member, and penetrate into the backfill material together with the object to be laid through the support. It is relatively simple in construction, and is easy to mount on an object to be laid.

According to a tenth aspect of the present invention, there is provided a fluidizing device for applying a vibration to earth and sand or a backfill material to the fluidizing device according to the seventh, eighth or ninth aspect to promote fluidization. Is provided.

The submerging apparatus according to the eleventh aspect has a large number of jets for jetting a fluid, and supplies a jet of liquid or gas into earth and sand or backfill material within a range that causes fluidization from the jets. A fluidizing device configured as described above, and a pressing device for press-fitting the object to be laid into the sediment or the backfill material against the sinking resistance from the fluidized earth or sand or the backfill material. This corresponds to a fluidization device according to claim 7, 8 or 9 further including a pressing device.

Also in this case, by adding a vibration generator for giving vibration to the earth and sand or the backfill material,
Fluidization can be promoted. In this case, the vibration generating device can be integrated into the submerging device, or an independent vibration generating device separate from the submerging device can be used.

According to a twelfth aspect of the present invention, there is provided a submerging apparatus having an inner diameter capable of storing a pipe, which is an object to be submerged, to be submerged in earth and sand or a backfill material, and a plurality of small holes serving as jet holes on an outer surface. Is formed, a fluid is supplied to the inside of the tubular body, and the fluid is ejected from the ejection port.

Further, a vibration generator for applying vibration to the pipe may be provided, and vibration may be transmitted from the pipe to the earth or sand or the backfill material to promote fluidization of the earth or sand or the backfill material.

In addition, in the present invention, since the fluidizing device or the sinking device may move forward in accordance with the progress of the construction of the pipeline, these devices are mounted on a self-propelled traveling device and moved. By doing so, the construction efficiency can be further improved.

Tanks, pumps, pipes, compressors, motive power of a sunk apparatus, jacks as sunk means or pressing means, vibrators as vibration generators, etc. for supplying water and air to the fluidizing apparatus are also used as traveling equipment. Although they can be mounted on the top, they may be separately mounted on other bogies or trucks.

When removing the submersible device, the traveling device is lifted to the ground as a reaction force. In this case as well, the fluid can be lifted while ejecting the fluid from the ejection port while applying vibration as necessary.

When the pipeline cannot be continuously laid, a work space can be formed in the excavation groove by partially installing a pier or a partition wall to join the pipeline. Such a partition can also be used when it is desired to limit the fluidized section of the backfill material.

The fluidizing device or the submerging device according to the seventh to eleventh aspects is also used when submerging an object to be submerged other than a pipe or when fluidizing earth and sand or a backfill material for another purpose. Can be.

Further, the fluidizing device or the submerging device according to claims 7 to 12 is not limited to the backfill material for the excavated portion, but may be applied to the soil forming the original ground as long as the ground conditions are suitable for fluidization. It is also possible to apply to.

[0047]

1 to 3 show an embodiment of the present invention. In this embodiment, a pipe forming member 3 laid down in backfill sand 2 as backfill material. Has the flexibility of being able to house the conduit member 3 inside,
The fluidizing device 4 is composed of a plate-like body 4a having a large number of small holes formed on the outer surface thereof as a spout 4b.

The fluidizing device 4 is supported by an arm 7 extending downward from the self-propelled traveling device 6, and the vibration of the vibration generator 8 is applied to the plate-like body 4 a of the fluidizing device 4 via the arm 7. Vibration is applied to the backfill sand 2 that is transmitted and filled in the excavation trench 1.

The traveling device 6 is installed so as to straddle the excavation groove 1, and in the illustrated example, can be moved in the direction of the excavation groove 1 by a caterpillar. Although not shown, a jack, a plate for pushing down and pulling up the plate-like body 4a wound around the pipe member 3 through the arm 7, in addition to the vibration generator 8 described above, are provided on the traveling device 6. A tank, a pump, a compressor for introducing air, various hydraulic or electric devices serving as a power source of the jack and the vibration generating device 8, and the like are loaded on the inside of the body 4a.

In the construction, after the backfill sand 2 is filled in the excavation groove 1, the traveling device 6 is installed so as to straddle the excavation groove 1, water is sent to the plate-like body 4 a through the hose 5, and the plate-like body 4 a Of the fluidizing device 4 together with the pipeline constituent members 3 housed inside while jetting water from a large number of outlets 4b opening to the outer surface of the plate 4 to fluidize the backfill sand 2 around the plate-like body 4a. The body 4a is laid down.

FIG. 3 shows a state in which the conduit component 3 is gradually sunk horizontally while ejecting and fluidizing the backfill sand 2 in the excavation groove 1. Pipeline component 3
Is set to a predetermined depth, and the jetting port 4b of the fluidizing device 4
(Refer to FIG. 2) Further, while the surrounding backfill sand 2 is fluidized by further squirting water or the like, the pipeline constituent member 3 is filled with the backfill sand 2.
And only the flexible plate-like body 4a (see FIG. 2) is lifted to the ground by a lifting material such as the wire 9.

Regarding the joining of the pipeline components 3,
The joining operation is performed in the excavation groove 1 while leaving the pipe joint position of the excavation groove 1 as a working space. In addition, when the duct component 3 has flexibility, the joining operation of the duct components 3 may be performed on or near the ground, and the laying operation may be continuously performed while the traveling device 6 is advanced. It is possible.

FIGS. 4 and 5 show another embodiment of the present invention. In this example, the fluidizing device 14 has a vertical and horizontal pipe 14a inside, and a large number of jet ports 14b on one side. When the excavation groove 1 is backfilled with the backfill sand 2 by using the plate-shaped fluidization device 14 having the following, the fluidization device 14 is previously embedded in the backfill sand 2 at the wall surfaces on both sides of the excavation groove 1.

When submerging the conduit member 2, water is spouted from the spout 14b of the fluidizing device 14, or air is spouted instead of or together with water.
The backfill sand 2 in the excavation groove 1 is fluidized and settled.

Although not shown, in this case as well, the installation is performed by using a press-fitting device such as a vibration generating device or a jack if necessary. The plate-shaped fluidizing device 14 can prevent fluidization to the ground outside the excavation groove 1 by using a water-impermeable material. May be laid.

When the fluidizing device 14 is pulled up, by pulling it up while ejecting water or air from the outlet 14b, it is possible to reduce the pulling resistance and prevent the ground from being loosened after the pulling.

FIGS. 6 and 7 show still another embodiment of the present invention. In this example, a fluidizing device 24 is shown.
A pipe forming member is formed by using a fluidizing device 24 in which a vertical pipe 24a having a plurality of outlets 24b at the lower end is connected in parallel, and ejecting water or air from the lower end outlet 24b. Backfill sand 2 in excavation trench 1 with 3 installed
And the backfill sand 2 at the lower part of the pipeline component 3
While the fluidized fluid is flowing, the pipeline component 3 is gradually sunk.

Each of the pipes 24a is connected at its upper end by a header 25 connected to a water or air supply source.
Fluidized uniformly in the longitudinal direction of the conduit component 3,
The conduit component 3 can be laid substantially horizontally.

The mechanism of the fluidizing device 24 is the simplest form.
It is relatively easy to pull out a. FIG. 8 and FIG.
This embodiment shows still another embodiment of the present invention. In this example, a fluidizing device 31 including a pipe 31a parallel to a pipe structure having a plurality of ejection ports 31b is used as a fluidizing device 31.
While injecting water or air from the spout 31b, penetrate into the backfill sand 2 of the excavation groove 1 in which the conduit component 3 is installed, and fill the backfill sand 2 around the conduit component 3 with water. While the fluidized fluid is flowing, the pipeline component 3 is gradually sunk.

A settling device 32 having the fluidizing device 31
Sandwiches the conduit member 3 with the attached clamp 32a,
A pushing device (not shown) attached to the device assists the settlement. The pushing device is capable of moving the laying device 32 not only in the vertical direction but also in the horizontal direction, and can install the conduit member 3 at a predetermined position.

As shown in FIG. 9 (a), the pipe constituting member 3 is sunk using the jet of water or air from the fluidizing device 31, and then the clamp 32a of the squatting device 32 is sunk as shown in FIG. 9 (b). Is opened, the laying device 31 is pulled up in a state where the conduit component 3 is left in the backfill sand 2, and the laying of the conduit component 3 is completed.

Further, by adding the vibration generator of the embodiment shown in FIG. 1 to the submerging device 31, the submerging is further assisted. In the present embodiment, a plurality (three) of the pipes 31a are attached and clamped around the conduit component 3 with the clamps 32a. However, the pipes 31a are devised by devising the arrangement or shape of the ejection ports 31b. The body 31a may be singular.

In this embodiment, the pipe 31a is attached so as to be parallel to the longitudinal direction of the pipe constituting member 3. However, a comb-shaped pipe having a large number of branches can be used.

[0064]

According to the present invention, since the earth retaining work can be omitted, the workability can be greatly improved, and the work period can be shortened, labor can be saved, and the construction cost can be reduced. Since a series of operations can be performed without an operator entering the excavation trench, safety in the operation is improved. The backfill work can be simplified, the filling and compaction properties around the pipeline after laying are uniform, and the same effect as water tightening can be obtained, achieving quality improvement, high efficiency, labor saving, and low cost it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIGS. 2A and 2B show an embodiment of a fluidizing device according to the present invention, in which FIG. 2A is a perspective view, FIG. 2B is an axial vertical sectional view, and FIG. It is.

FIG. 3 is a vertical cross-sectional view in a direction perpendicular to the pipeline, showing how the pipeline is laid down using the fluidizing device of FIG. 2;

FIG. 4 shows another embodiment of the fluidizing device according to the present invention, wherein (a) is a perspective view and (b) is a vertical sectional view of the fluidizing device.

FIG. 5 is a vertical cross-sectional view in a direction perpendicular to the pipeline, showing how the pipeline is laid down using the fluidizing device of FIG. 4;

FIG. 6 shows still another embodiment of the fluidizing device according to the present invention, in which (a) is a vertical sectional view in a pipe direction,
(b) is a vertical sectional view in a direction perpendicular to the pipeline.

FIG. 7 is a vertical cross-sectional view in a direction perpendicular to the pipeline, showing how the pipeline is laid down using the fluidizing device of FIG. 6;

FIGS. 8A and 8B show still another embodiment of the submerging device provided with the fluidizing device according to the present invention, in which (a) and (b) are vertical cross-sectional views in the direction perpendicular to the pipeline showing opening and closing of the clamp; (c) is a vertical sectional view in the pipeline direction.

FIG. 9 is a vertical cross-sectional view in a direction perpendicular to the pipeline, showing a procedure for laying down the pipeline components in the embodiment of FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drilling groove, 2 ... Backfill sand, 3 ... Pipe constituent member, 4 ... Fluidizer, 4a ... Plate body, 4b ... Outlet, 5 ... Hose,
6 traveling device, 7 arm, 8 vibration generator, 9 wire, 14 fluidizer, 14a piping, 14b spout, 15 hose, 24 fluidizer, 24a pipe, 24b ... spout, 25 ... header, 31 ... fluidizer, 31a ... pipe, 31b ... spout, 32 ... sinking device, 32a ... clamp

Claims (12)

[Claims] After excavating a pipeline laying position in a groove shape, the excavation groove is backfilled with a backfill material, the backfill material is fluidized by a jet of fluid, and the conduit member is fluidized. A pipe burying method, wherein the pipe is laid in the backfill material. 2. After backfilling a digging trench with a backfill material, a fluidizing device having a large number of ejection ports for ejecting a liquid or a gas is penetrated into the backfill material according to the sinking of a pipe component. 2. The method according to claim 1, wherein a jet of liquid or gas is supplied from the jet port to the vicinity of the duct component. 3. A pipeline submerging system according to claim 1, wherein a fluidizer having a large number of ejection ports for ejecting a liquid or a gas is installed in the excavation groove when the excavation groove is backfilled with the backfill material. Construction method. 4. The method according to claim 1, wherein vibration is applied to the backfill material to promote fluidization of the backfill material. 5. After excavating a pipeline laying position in a groove shape, the excavation groove is back-filled with a backfill material, the backfill material is fluidized by vibration, and the conduit component is fluidized. A method of submerging pipes, characterized by being laid down in reclaimed material. 6. After excavating a conduit laying position in a groove shape, a backfill material containing a solidified material is filled into the excavation groove, and the conduit component is placed in an unhardened fluidized state in which the backfill material is uncured. Pipeline burial method characterized by laying in the backfill material in between. 7. A liquid or gas jet is supplied to the earth and sand or backfill material within a range in which fluidization is generated from the jets by providing a large number of jets for jetting a fluid. Fluidizer. 8. The spout is formed on one surface of a flexible hollow plate or a hollow sheet connected to a fluid supply source, and the spout is wound around an object to be laid with the spout side as an outer surface. The fluidizing device according to claim 7, wherein the fluidizing device is configured. 9. The spout is formed in a pipe connected to a fluid supply source, and the pipe is supported by a submerging device or a support attached to an object to be submerged. Item 7. A fluidization device according to Item 7. 10. It has a number of ejection ports for ejecting a fluid,
A fluid supply device configured to supply a jet of liquid or gas into the earth and sand or backfill material within a range that causes fluidization from the jet port, and a vibration generator for applying vibration to the sand or backfill material And a fluidizing device comprising: 11. It has a number of ejection ports for ejecting a fluid,
A fluidizing device configured to supply a jet of liquid or gas into the earth or backfill within a range that causes fluidization from the jet port, and a sinking resistance from the sand or backfill that fluidizes the object to be settled. A depressing device for press-fitting the material into earth and sand or backfill material to counteract the problem. 12. A pipe having an inner diameter capable of storing a pipe as an object to be buried to be buried in earth and sand or a backfill material, and having a plurality of small holes formed on an outer surface thereof as a spout. A laying device, characterized in that a fluid is supplied to the inside of the tube and is spouted from the spout.