JPS5840072B2 - How to lay pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laying conduits used for water supply, sewerage, telegraph and power cables, and the like.

Conventionally, for example, when laying water and sewage pipelines, after excavating a trench, sheet piles, H-shaped steel, etc. were driven along the slope of the trench to prevent the slope from collapsing. A method is used in which a base made of a material such as concrete is installed at the bottom of the excavation, a pipe is formed by successively placing humid pipes and steel pipes on this base, and the excavated area is then backfilled.

However, the conventional laying method is difficult to install in places where sheet piles etc. cannot be driven due to a gravel layer, places where it is inappropriate to drive sheet piles etc. due to vibration noise, places where the groundwater level is high and it is difficult to treat the groundwater level. In places where it is not possible to lower the installation cost, the installation cost will rise.

In addition, because the backfilling of the earth and sand after pipe formation cannot be made homogeneous, it is difficult to ensure that the pipes are completely laid, which can lead to water leaks at a later date or lead to pipe destruction accidents. .

Furthermore, vibrations caused when sheet piles and the like are pulled out and removed have an adverse effect on the pipeline, and since voids are created in the area where the sheet piles are pulled out, there is a problem in that the ground surface sinks due to subsequent vibrations caused by the operation of automobiles and the like.

Therefore, in order to solve the above-mentioned conventional problems, the present applicant has previously published a "method for laying pipes" (Japanese Patent Application No. 56-2145).
is proposed.

In this "pipeline laying method," pipes with both ends open are sequentially suspended in a trench excavated while filling with muddy water, and a pipe is formed by joining the pipes. In order to liquid-tightly shut off the inside of the pipe, a locking box is inserted into the groove and suspended, and the side of the locking box is attached to the outermost end of the pipe body of the pipe. and then draining a portion of the muddy water within the conduit out of the conduit, thereby causing the locking box to more closely engage the end of the conduit and the conduit of the locking box. In order to tightly connect the pipe bodies by an axial force acting on the pipe bodies constituting the pipe line due to the difference between the mud water pressure on the inside and the mud water pressure on the opposite side, the pipe bodies are then supported by the surrounding ground. Among the muddy water in the trench, at least the muddy water surrounding the pipe body is solidified, and after the muddy water has solidified, the front piping body is unsuspended and the locking box is removed, so that a pipe line can be laid. There is.

Although this method can solve the above conventional problems, when excavating unexcavated ground with an excavating machine such as a backhoe using the space created after the locking box is removed, the wIJ of the ground There is a risk that the resulting porosity may enter the pipe.

In particular, if rust adheres near the tip of the pipe, when connecting a new pipe to the pipe to extend the pipe, it will not only be impossible to connect, but also hinder the progress of the installation work. It also happens.

Therefore, an object of the present invention is to provide a method for laying a pipe line that eliminates the above-mentioned inconveniences associated with laying a pipe line.

The feature of the present invention is that the tip of the pipe body, which is open at both ends, is placed in the trench excavated while filling with muddy water.
and a second locking box to prevent muddy water containing a solidification material from entering the pipe body during subsequent solidification of muddy water, and to facilitate re-excavation of the ground after solidification of muddy water. , leaving the first locking box in contact with the tip of the pipe body, and removing the second locking box.
By removing the locking box, it is possible to prevent porosity that is generated when the ground is excavated while filling the space with muddy water from entering the pipe body.

The features of the present invention will become more apparent from the following description of the illustrated embodiment. Referring to FIG. 1, first, a trench 10 is formed by excavating the ground.

Excavation machines such as backhoes and clamshells can be used to excavate the ground, but in order to prevent the slope of the trench 10 from collapsing and the groundwater level from lowering, the excavation is performed while filling the trench with muddy water 12.

After forming the groove 10, a tubular body with both ends open, such as a fume pipe or a steel pipe, is placed in the groove 10.

A conduit 16 is formed within the groove 10 by the arrangement of the tube 14 .

When forming the pipe line 16, it is also possible to connect a plurality of pipe bodies 14 on the ground in advance and then insert them into the muddy water 12. The pipe line 16 can be formed by suspending the pipe bodies 14 with appropriate suspension means 18 and joining the pipe bodies 14 to each other in the muddy water 12.

Further, although not shown, instead of the plurality of tubes 14, one elongated tube with both ends open corresponding to the length of the plurality of tubes 14 may be arranged in the groove 10.

After the pipe body 14 is placed in the groove 10 filled with the strained muddy water 12, the first locking box 20 and the second locking box 22 are inserted into the muddy water 12 at the same time or one after the other. .

First and second locking boxes 2 in muddy water 12
0,22 such that one side 28 of the first locking box 20 abuts the tip 24 of the conduit 16, which is the open end of the tube body 14, and the second locking box 22 contacts the first locking box 22. on one side 28 and on the opposite side 30 of box 20.

The insertion of the first and second locking boxes 20, 22 into the muddy water 12 and said positioning in the muddy water 12 are carried out by means of a crane (not shown), for example, in the first and second locking boxes 20, 22 via wires 26.
This can be carried out while suspending each of the locking boxes 20 and 22.

One side 28 of the first locking box 20 and the tube body 1
4, in order to more easily position the first locking box 20 with respect to the tip 24, insert the first locking box 20 into the muddy water 12. After the positioning is completed, the second locking box 22 is removed from the muddy water 12.
It is desirable to insert it inside.

The first and second locking boxes 20.22 shown in FIGS. 4 to 1 are each formed into a box shape by welding iron or steel plates. the rear and front parts of the
One side 28 and the opposite side 3 of the locking box 20 of
0 and one side 32 of the second locking box 22
They are separably engaged by at least one pair of retaining means 34 such as male and female sliders provided therein, and each slides in the longitudinal direction.

As shown in FIG. 6, the first locking box 20 has one side 28 formed in a step-like manner with respect to the opposite side 30 which is flat and parallel to one side 32 of the second locking box 22. It is composed of two continuous parts: an upper wide part 36 and a lower narrow part 38.

The front surface of the narrow portion 38 has an abutting portion 40 that abuts the tip 24 of the pipe 16, and a sealing material 42 having a shape corresponding to the shape of the tip 24 of the tube body 14 is provided at the center of the abutting portion 40. is pasted to the tip 24 of the conduit 16 via this sealant 42.
is more reliably shielded.

Further, both ends 44 of the wide portion 36 extend downward and surround a portion of the outer ring 46 of the upper half of the sealing material 42, that is, the contact portion 40.

Therefore, as will be described later, after the muddy water 12 solidifies, the first
When the locking box 20 is pulled out, a non-solidified portion is formed in the upper half of the tube 14 near the tip 24 as shown in FIG.

This unsolidified portion is used for positioning the pipe 14 with respect to the fixed pipe 16 when connecting another pipe 14 to the tip 24 of the pipe 14 in the muddy water 12 to further extend the pipe 16. Contribute to

That is, as described in Japanese Patent Application No. 56-102292, a claw member protruding from a male part of a tube is brought into contact with a part of the outer periphery of the female part of another tube, that is, the non-solidified part. This allows mutual positioning of the tube bodies.

In addition to the above, the first locking box 20 has one side 28 of the first locking box 20 in a flat plate shape similar to the opposite side 30, and any part of the flat plate can be connected to the pipe line 16. It may also be a contact portion for the tip portion 24.

Furthermore, a sealing material may be placed at the abutting portion of the first locking box 20.

By inserting the first and second locking boxes 20° 22 into the muddy water 12, one side 28 of the first locking box 20 as described above, that is, the abutment portion 4
0 is brought into contact with the tip end 24 of the conduit 16 via the sealing material 42, and the first locking box 2 is placed in the muddy water 12.
0, the second locking box 22
the first locking box 20 via the engagement means 34
After being placed along the opposite side 301 of the muddy water 12, the muddy water 12 is solidified.

Prior to the solidification of this muddy water 12, the first locking box 20 is brought into close contact with the tip 24 of the pipe line 16, and
In order to more closely engage the pipe bodies constituting the pipe, the muddy water 12 in the pipe 16 is removed from the rear end (not shown) of the pipe 16 to the extent that the pipe 16 does not float up due to buoyancy. You can take it outside.

By removing a part of the muddy water 12 in the pipe 16, the pipe 1
6 The first locking box 20 is activated by the differential pressure between the inside and outside of the mud water pressure.
is strongly pressed against the tip 24, and as a result, the tube body 1
The loosening of the joints between the four parts is eliminated.

To solidify the muddy water 12, the muddy water 12 in the trench 10 is sucked out by a pump (not shown) and sent to a kneading plant (not shown) installed on the ground, where the muddy water 12 is mixed with cement or water glass. It is mixed with other solidifying agents and sent to the bottom of the groove 10 as solidified muddy water, so that the solidified muddy water reaches the top of the pipe line 16.

At this time, the amount of the solidifying agent added is adjusted to form the solidified layer 50 described below.
The intensity can be adjusted.

As a result, the periphery of the pipe 16 is solidified leaving an unsolidified portion 48 (FIG. 3) in the upper half near the tip 24 of the pipe 16, and the pipe 16 is supported by the surrounding ground 52 via the solidified layer 50. be done.

Depending on the purpose, it is also possible to replace all of the muddy water 12 with solidified muddy water.

A first locking box 2 is provided at the tip 24 of the conduit 16.
0 are in contact with each other, the solidified mud water will not enter into the pipe line 16.

When the solidified layer 50 reaches a state where it can stand on its own, the second locking box 22 is pulled upward and removed.

If this lifting is performed while supplying muddy water to the space 54 described later, the first locking box 20 will not be inadvertently separated from the tip 24 of the conduit 16.

After the second locking box 22 is removed, a space 54 surrounded by a solidified layer 50 is created, into which an excavation machine, for example a bucket 56 of a backhoe, is inserted to fill the unexcavated ground 58 with muddy water 60. It can be excavated while drilling.

Further, the size of the space 54 can be freely determined by changing the size of the second locking box 22 or by using a plurality of locking boxes as the second locking box.

When the unexcavated ground 58 is excavated to further extend the trench, the groove created by the excavation is removed from the first locking box 2.
Since the 0 is in contact with and shields the tip 24 of the conduit 16, it will not enter the conduit 16 and therefore will not be deposited near the tip 24 of the conduit 16.

For this reason, when connecting another tube to the tip 24 later, there is no possibility that the tube will not be able to fit into the tip 24 due to the rust.

After the excavation has progressed and a groove has been formed to the extent that there is no fear that the porosity produced by the excavation will enter the pipe line 16, or after a groove of a certain length has been formed, the first locking box 20 is pulled upward. and remove it.

If the first locking boxes 20 are tightly connected, the muddy water is returned to the pipe 16 prior to the lifting to release the force due to the pressure difference of the muddy water acting on the first locking box 20. Bye.

According to the present invention, porosity produced by excavating unexcavated ground never enters the pipeline, and therefore does not become an obstacle to adding a new pipe body to the pipeline, making it easier to lay the pipeline. Work can proceed smoothly.

Further, according to the present invention, when starting excavation of unexcavated ground, the size of the space for inserting the excavation machine can be freely set, which facilitates the excavation of the ground and promotes the excavation work. Contribute.

Further, according to the present invention, when replacing muddy water with solidified muddy water to form a solidified layer, it is possible to prevent the solidified muddy water from entering the pipe, thereby preventing the flow within the pipe after installation. There is no such thing.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the state in which the first and second locking boxes are inserted into muddy water, Fig. 2 is a longitudinal sectional view showing the state after the second locking box is pulled out, and Fig. 3 is a longitudinal sectional view showing the state after the second locking box is pulled out. 4 is a front view of the first and second locking boxes in the locked state, and FIG. 5 is a front view of the first and second locking boxes in the engaged state. 6 is a longitudinal cross-sectional view taken along line 6--6 of FIG. 5; FIG. 7 is a plan view of the first and twentieth locking boxes in engagement; FIG. It is. 10: Groove, 12: Muddy water, 14: Pipe body, 16: Pipeline, 20
: first locking box, 22: second locking box, 24: tip end of conduit, 34: engaging means, 36
: Wide part, 38: Narrow part, 40: Contact part, 42
: sealing material, 48: unsolidified part, 54: space, 58: unexcavated part, 60: muddy water.

Claims (1)

[Scope of Claims] 1. After placing a tubular body with both ends open in a trench excavated while filling muddy water, one side of the first locking box abuts the tip of the tubular body, and a second locking box is placed in the groove. the first and second locking boxes are inserted into the muddy water at the same time or one after the other so that the first and second locking boxes are disposed on the opposite side of the one side of the first locking box; After solidifying everything, remove the second rocking box, excavate the ground while filling the space created by the removal of the second rocking box with muddy water, and then remove the first rocking box. method of laying pipes, including 2. The laying method according to claim 1, wherein the first locking box is provided with an abutment part on the one side that can come into close contact with the tip end of the tube body. 3. The laying method according to claim 2, wherein the contact portion on one side of the first locking box is provided with a sealing material. 4. The first locking box consists of a continuous wide part and a narrow part, the narrow part has the abutting part, and a part of the abutting part is surrounded by the wide part. , the laying method according to claim 1, 2 or 3. 5. The laying method of claim 1, wherein the first and second locking boxes are separably engaged with each other.