JPS5914667B2 - How to lay pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laying pipes for water supply, sewerage, telegraph and power tunnels, subways, and pedestrian lines.

For example, the conventional method of laying water and sewage pipelines is to dig a trench using a backhoe or a Kusimshiel, and then drive sheet piles or H-shaped steel along the construction surface to prevent the construction surface from collapsing. On the other hand, a concrete base is provided at the bottom of the excavation, and a pipe is laid by sequentially placing humid pipes or steel pipes on this base, and then the excavated area is backfilled.

However, the conventional installation method is difficult to install in places where it is impossible to drive sheet piles due to sand and gravel layers, places where it is inappropriate to drive sheet piles etc. because it causes vibration noise, places where the groundwater level is high and it is difficult to treat, In places where it is not possible to lower the installation cost, the installation cost becomes extremely high.

In addition, backfilling of earth and sand after conduit construction is not uniform, which has an adverse effect on the conduit, causing water leaks and accidents such as conduit rupture.

Also, when pulling out and removing sheet piles, etc. Another drawback is that the vibrations have a negative effect on the pipes, and because there are voids at the site of the extraction, the ground surface may sink due to the vibrations that are subsequently applied by cars and other vehicles.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for laying a pipe line that can solve the above-mentioned conventional problems.

The method of laying a pipe according to the present invention involves sequentially suspending pipe bodies with both ends open in a trench excavated while filling muddy water to form a pipe line formed by joining the pipe bodies, and while suspending the pipe, In order to liquid-tightly shut off the inside of the pipe, a locking box is inserted into the groove and suspended, and the end of the pipe located at the outermost side of the pipe is located on the side of the locking box. and then expel 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 tube and the locking box of the conduit. The axial force acting on the pipe bodies constituting the pipe line due to the difference between the mud water pressure on the inside of the road and the mud water pressure on the opposite side causes the pipe bodies to be more closely connected, and then the pipe bodies are bonded to the surrounding ground. The method includes solidifying at least the muddy water in the groove that is increasing in the pipe line in order to support the pipe, and after solidifying the muddy water, the front pipe body is unsuspended and the locking box is removed.

Examples will be described below with reference to the accompanying drawings.

First, a trench 10 is excavated using a backhoe, clamshell, or the like.

This trench 10 is filled with muddy water 12 to prevent the slope of the trench from collapsing and the groundwater level from falling.

Next, the tube body 14 constituting the tube path 15 is suspended and installed in the muddy water by a hanging jig 16.

The tubular body 14 is, for example, a steel pipe or a humid pipe with both ends open.

The hanging jig 16 is made of, for example, a steel rod.

It is preferable that the hanging jig 16 be removed from the tube body 14 after solidifying the peripheral portion of the tube body 14, as will be described later.

For example, a screw is provided at the lower end of the hanging jig 16, and the hanging jig 16 is screwed into a screw provided on the tube body 14.

Of course, when solidifying the peripheral part of the pipe body, which will be described later, the hanging jig 1
6 itself was also attached to the solidifying agent, and the hanging jig 1
If there is a possibility that 6 cannot be added or removed, form it as follows.

That is, a steel rod having a screw at the upper end is extended upward from the pipe body 14, and this steel rod is positioned above the solidification level 18, and on the other hand, the hanging jig 16 is provided with a screw provided at the upper end of the steel rod. A screw that engages with the screw is provided, and both screws are engaged to connect the pipe body 1.
4 is suspended.

The upper end of the hanging jig 16 is locked to the beam 20.

In this case, the upper end of the hanging jig 16 is not fixed to the beam 20, but is swingably locked to the beam 20 so that the tube body 14 can move slightly in the axial direction.

For example, a screw may be provided at the upper end of the lifting jig 16, and a through hole with a larger diameter than the outer diameter of this upper end may be provided in the beam 20.
the upper end of the hanging jig 16 is inserted into the through hole of the beam 20, and as shown in FIG.
6 is suspended.

In this case, the level of the tube body 14 can be adjusted by changing the screwing amount of the nut 21.

The beam 20 is placed on reference rails 22 disposed on both sides of the groove 10 along the groove.

The level of the tubular body 14 with respect to the reference rail 22 can be adjusted by interposing a spacer between the reference rail 22 and the beam 20 as well as by using the nut 21 screwed into the hanging jig 16 as described above.

Further, the position adjustment of the tube body 14 in the axial direction is performed using the reference rail 2.
This is achieved by moving the beam 20 from side to side on 2.

By the above operation, one or several tube bodies 14 are installed in muddy water to form a conduit 15, and one tube body 14 and the connecting portions 13 of adjacent tube bodies 14 are lightly connected to each other.

After that, the locking box 26 is inserted into the muddy water, and the open end 24 of the pipe body 14 located at the outermost side of the pipe line 15 is
This locking box 26 is engaged.

If a sealing member 2B having a size and shape that matches the open end 24 is placed on the side of the locking box 26 facing the open end 24 of the tube body 14, the open end 24 and the locking box 26 can be connected to each other. The engagement can be made more liquid-tight.

With the sealing member 28 in contact with the open end 24 of the tubular body 14, the locking box 26 is suspended by, for example, a crane.

As a result, the locking box 26 is held so as to be swingable in the axial direction of the tube body 14.

The rocking box may be any water-impermeable plate-like body that does not float due to buoyancy in muddy water.

However, it is preferable to use a locking box such as the one shown in the figure, which is used in ordinary water stop construction.

That is, since this rocking box has a large thickness in the axial direction of the tube body, when solidifying muddy water, which will be described later, the rocking box can remove the solidified muddy water and prevent this portion from solidifying.

As a result, even if the area around the locking box solidifies.

After the locking box is pulled out, it will be filled with muddy water, so even if the pipe is to be laid later, there will be no need to excavate this area.Moreover, if a backhoe etc. is inserted into this area, the first excavation point will be excavated. can be easily done.

With the locking box 26 engaged with the open end 24 of the tube 14, the locking box 26 of the conduit 15 is
When the muddy water in the pipe 15 is discharged to the outside of the pipe by a pump (not shown) connected to the open end opposite to the open end where the locking box 26 is located, the pressure inside and outside the pipe is A force due to the difference acts.

In this case, the larger the pressure difference, the more the locking box 26
However, if the muddy water in the pipe is discharged too much, buoyancy will act on the pipe body 14 and the level will be different.

Therefore, muddy water is discharged from the pipe to such an extent that such buoyancy does not act.

Since the force acts in the direction in which the locking box 26 presses the tube body 14, the tube body 14 is slightly displaced 1 in the axial direction, and the mutual connection portions 13 of the tube bodies are tightly fitted into each other. .

In this case, if a sealing member is placed at the connection part 13,
Adjacent tube bodies 14 are fitted together more liquid-tightly.

However, if the periphery of the conduit 15 is surrounded by a water-impermeable solidifying agent according to the laying method of the present invention, water leakage from the surrounding ground to the conduit or vice versa will hardly occur.

Therefore, in this case, it is not necessary to arrange the seal member on the connecting portion 13 of the tube body 14.

With a pressing force applied to the pipe body 14 by the locking box 26, the muddy water 12 in the groove 10 is pumped out by the pump 30 and sent to the solidification agent cross line plant 32 installed on the ground.

In this plant 32, the muddy water is mixed with cement, water glass, or other solidifying agent, and is sent to the bottom of the trench 10 as solidified muddy water, so that the solidified muddy water reaches the top of the pipe 15.

As a result, the area around the pipe line 15 is solidified, so the area around the pipe line 15 is solidified.
5 will be supported by the surrounding ground 35 via the solidified layer 34.

In this case, if the purpose is simply to support the pipe line 15, the solidified muddy water may be replaced with muddy water so that the upper surface of the solidified layer 34 is located at the lowest part of the pipe line.

In addition, if the purpose is to support the pipe line 15 and to prevent the pipe line from moving in the lateral direction perpendicular to the axial direction, the solidified layer 3
The solidified muddy water may be replaced with muddy water so that the upper surface of the pipe 15 is located near the horizontal plane that includes the axis of the pipe 15.

Furthermore, in order to use the solidified layer 34 to prevent damage to the pipe line 15 during subsequent backfilling and to prevent water leakage from the connection part 13 of the pipe body, the solidified layer 34 must be formed to the extent that it surrounds the pipe line 15.
form 4.

In the present invention, the meaning of solidifying at least the muddy water that surrounds the pipe line is to perform any of the above methods depending on the purpose.

The solidified layer 34 solidifies and increases its strength over time, so after the strength has been sufficiently developed, the tube body 14 is released from being suspended by the hanging jig 16, and the locking box 26 is removed.

This step may be performed in any order.

Furthermore, after the lifting jig 16 is removed. Earth and sand 36 is backfilled above the solidified layer 34.

The locking box 26 is removed by pulling it upward.

When the locking box 26 separates from the open end 24 of the pipe body 14, the muddy water above the solid circulation 34 flows into the pipe line 15 from the pipe body located at the end, so that the water level of the muddy water in the groove 10 increases. It is possible for the groove to fall and collapse to occur.

Therefore, it is preferable to remove the locking box 26 while supplying muddy water into the groove 10.

In removing the locking box as described above, the force due to the pressure difference between the muddy water is acting on the locking box 26, so a considerable force is required to pull it up.

In order to avoid this, the muddy water may be returned to the pipe line 15 prior to lifting, so that the force due to the pressure difference of the muddy water acting on the locking box is reduced to substantially zero.

After removing the locking box 26 and hanging jig 16,
Similarly to the above, a groove 10 is excavated, another pipe body 14 is connected to the end of the pipe line 15, and the pipe line 15 is successively extended.

In this case, the hanging jig 16, beam 20, etc. are reused when connecting the tube body 14 later.

The effects of the pipe laying method of the present invention can be summarized as follows.

(a) Since the trench is filled with muddy water to prevent the slope of the trench from collapsing, there is no need to drive sheet piles, etc., so there is no vibration or noise.

←) Construction is possible even in layers with cobblestones where it is not possible to drive sheet biles or H-shaped steel.

(c) Mountain retaining shoring is not required.

2) There is no need for auxiliary construction methods such as methods to prevent groundwater level decline or chemical injection methods.

(e) Since the groundwater level will not be lowered from its current location, subsidence and disturbance of surrounding ground will not occur.

(F) If the periphery of the pipe is surrounded by a solidified layer, there will be no concentrated load or uneven pressure applied to the pipe, and there will be no negative impact on the pipe.

(g) The strength of the solidified material for the solidified layer can be freely selected, taking into account the strength of the surrounding ground, the purpose of the pipeline, seismic resistance, etc.

(H) The permeability coefficient of the solidified layer is very small at around 10,
Because it belongs to the category of impermeable layer, if the pipeline is surrounded by a solidified layer, there will be no possibility of underground water leaking into the pipeline or conversely, water and sewage flowing from the pipeline into the ground.

ω) Since the pipe can be surrounded by a homogeneous material along its entire length, the seismic performance is much better than that in a heterogeneous ground.

C) The height range of the solidified layer can be changed freely, and the solidification time can also be changed according to the construction conditions.

The locking box is removed after the muddy water solidifies, so gaining space after its removal is the key to success.

Therefore, during the subsequent excavation of a trench for laying a pipeline, this space can be used as a handhold for inserting a packet of excavation equipment such as a backhoe or a clamshell, and the existing pipe can be removed by the packet. damage can be prevented, thereby increasing excavation efficiency and, by extension, construction efficiency.

(b) Installation costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the laying method of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is an enlarged cross-sectional view taken along line 3-3 in FIG. 10...Ditch, 12...Muddy water, 14...
... Pipe body, 15 ... Conduit, 16 ...
・Hanging jig, 20... Beam, 22...
・Reference rail, 24... Opening end, 26...
... Locking box, 28 ... Seal member.

Claims (1)

[Scope of Claims] 1. A pipe line is formed by sequentially suspending pipe bodies with both ends open in a trench excavated while filling with muddy water, and the pipe bodies are joined together. 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 positioned at the outermost side of the pipe. the locking box and the end of the tube, and then drain some of the muddy water in the pipeline out of the pipeline, thereby further enhancing the engagement between the locking box and the end of the tube. The tubes are connected to each other by a circular force acting on the tubes constituting the tube due to the difference between the mud pressure on the inside of the pipeline and the mud pressure on the opposite side of the locking box. In order to make the pipe body more dense and to support the pipe body on the surrounding ground, at least the muddy water in the trench that surrounds the pipe line is solidified, and after the muddy water is solidified, the pipe body is suspended. and removing said locking box. 2. Engaging with an end of a tube located at the outermost side of the conduit on the side of the locking box via a sealing material;
The method according to claim 1. 3. The method according to claim 1, wherein muddy water is discharged from the pipe line in an amount that creates a muddy water pressure difference on both sides of the locking box, but does not cause the pipe body to float due to buoyancy. 4. The method according to claim 1, wherein the muddy water surrounding the pipe is replaced with muddy water mixed with a hardening agent, and the muddy water mixed with the hardening agent is solidified between the wall of the pipe and the groove. 5. The method according to claim 1, wherein the locking box is removed from the slot while replenishing muddy water into the slot. 6. The method of claim 1, wherein the four-way box is used after returning the muddy water into the pipe to make the mud pressure inside and outside the pipe substantially the same.