JPS6357673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for installing a conduit such as a drain pipe in a trench filled with cement grout or mud.

According to various known construction methods, a trench is dug in the soil using cement grout or bentonite slurry, commonly referred to as grout, a drainage pipe or the like is installed in the conduit, and the slurry is solidified inside the trench.

The present invention is for installing conduits inside trenches filled with cement grout or the like.

The common method to date for laying such conduits, used for example as drainage pipes, is to assemble the conduit elements outside the trench and then use the cement-rich soil commonly used to excavate the trench. The whole can be submerged in bentonite mud and then the grout can be allowed to solidify as it is, or the mud that initially filled the trench can be replaced with concrete or cement grout and the pipe can be sealed by any means within the trench. There is a way to do this.

The above method sometimes presents difficulties, since all the elements have to be assembled outside the trench. In fact, this assembly method cannot be carried out satisfactorily if the trench excavation is carried out under the protection of cement- or grout-rich mud. This is because the cement or grout usually solidifies before the prefabricated conduit elements can be installed outside the trench.

The present invention is directed to a construction method for continuously installing conduit elements in a trench containing a wall protection fluid such as cement mortar or bentonite mud. In a construction method in which conduit elements are continuously laid in a trench filled with a protective fluid, a first element having a closure device 7 with a suction pipe 10 attached to one opening thereof is prepared in the trench, and the a second element having a temporary closure device attached to one end of the second element opposite the first element adjacent the other opening of the first element; A flow of the wall surface protection fluid is caused in the first element and near the opening on the first element side of the second element by suctioning through the first element, and the first element of the second element is sucked through the second element. This is a conduit laying method characterized in that the openings of the two elements are brought into contact by guiding the side openings, and negative pressure is generated within each element to join the elements.

According to the present invention, by using the flow of wall surface protection fluid (hereinafter referred to as mudflow) and negative pressure created by the suction device attached to the installed first element, the other different elements are continuously One can be fitted over the other, or one can be fitted into the other.

According to the method of the invention, each time an element is connected, it can be checked whether the previous elements fit into each other correctly. If the fit is not accurate, you will not be able to obtain mudflow or negative pressure for the element you are trying to connect.

The invention makes it possible to carry out the successive installation of various pipe elements in a trench, for example for the construction of drainage pipes, easily and quickly. The element is held and fixed by a sling during and after installation, the position of the sling itself being marked with respect to a fixing point outside the trench.

The element installed according to the invention is a cut pipe, but it can also be a shaped pipe such as an elbow pipe, a T-tube or a manhole. All holes, except those to be connected, must be temporarily closed to allow mudflow and negative pressure to occur inside the whole.

In order to provide a detailed understanding of the invention, reference will now be made to the accompanying drawings, which illustrate and illustrate exemplary implementations without any limitation.

Looking at the sectional view of FIG. 1, the manhole 1 is placed in a trench 2 and supported by a hanging rope 3, and the upper end of the latter is connected to a horizontal member 4 provided across the trench 2.
is fixed. The manhole 1 is fixed and sealed to a conduit element 5 that is assumed to have already been installed.

The conduit shall be connected through the manhole opening. Note that the first element 30 of the conduit is attached to the opening of the manhole.

According to the method of implementing the invention described herein:
One opening 6' of the first element 30 includes a metal plate 7 having a collar 8 and an annular packing 9.
That is, the collar 8, the annular packing 9 and the metal plate 7 constitute a closing device, and the collar 8 is fitted inside one opening 6',
The annular packing 9 is used for sealing between the inside and outside of the manhole. Of course, various types of gaskets can be used.

Suction pipe 1 reaching plate 7 and cross member
0 is connected at its upper part to a means for creating negative pressure, such as a suction pump.

The plate 7 is provided with a guide mechanism on the outside of the manhole 1, and in this figure the guide mechanism consists of a group of pointed pipes 11 provided around the other opening 6 of the first element 30. The guide mechanism allows the element of the pipe 12 to be easily positioned so that its end 13 can be located close to the opening 6 of the manhole 1.

Second pipe element (second element) 1
2 is supported by a sling 14, the latter sling locating said second element 12 from the height of the trench.

A second end 15 of the second element 12 opposite to the manhole 1 is a temporary closure device 1 made of a steel plate.
6, and the steel plate has an elastic arm 16.
a so that it can easily enter inside the second element 12.

According to the invention, after installing the metal plate 7 supported by any means perpendicular to the opening 6 of the manhole 1, the end 15 of the pipe is fitted with a closure device 16.
It is only necessary to lower the second element 12 after attaching it.

The second element 12 is also gradually submerged in the grout or muddy water contained in the trench 2, and the sling 14
Since the end 13 on the manhole 1 side is guided in front of the guide mechanism 11 by the mark on the upper part, it can be easily fitted and advanced as far as the opening 6. The negative pressure transmitted from the suction tube 10 into the interior of the second element 12 exerts a large axial force by the closure device 16, which force
The end 13 of the manhole 1 side of the manhole 1 is sucked into the opening 6 of the manhole 1.

More specifically, by suction through the suction pipe by the suction device, the wall surface protection fluid is removed inside the opening 6 and near the end (non-obstructed opening) 13 of the second element 12 on the manhole 1 side. A flow (mud flow) toward the suction pipe 10 occurs,
The mud flow directs the second element toward the first element 30 and brings their respective unobstructed openings into contact. Due to this contact, only the mudflow within the element is displaced via the suction tube, creating a negative pressure within the element. This negative pressure causes the elements to be tightly fitted and joined together.

Remove the left hanging rope 14 and adjust the right hanging rope 14.
The second element 12 can be fitted into the hole 6 of the manhole 1 and maintained in a predetermined direction.

It is then only necessary to stop the mud flow and the negative pressure action in the suction tube 10 and to remove the closure device 16 at the end 15 of the second element 12. For this purpose, it is only necessary to pull a cable (not shown), which is fixed, for example, on the outside of the closure device 16 and which rises to the level of the trench.

FIG. 2 shows the pipe supported by the sling 14 and placed in the position described above. The figure also shows a third element 17 supported by the device 21.
is shown, and the device itself is supported by two slings 18. The third element 17 includes a tulip-like member 19 at its left end that serves as a female member, into which the male rear end 15 of the second element 12 is inserted.

The other end 20 of the third element 17 receives the obstruction 16 described above.

FIG. 2 schematically shows a device 21 with two positioning hangers 22 and 23 as well as a third guide hanger 24, by means of which the device is 3 element 17, and the latter hanging fitting and the second element 1
A second element is located inside the tulip-like object 19 of the third element 17 so as to straddle the end 15 of the third element 17.
The end 15 of the element 12 is inserted smoothly.

Therefore, the device 21 and its support hanging fittings 22, 2
After pulling out the third element 17 and the guide hanging fitting 24, place the third element 17 in the correct position relative to the trench.
Just fix it.

Then, after removing the negative pressure inside the pipe, operation resumes to remove the blockage 16 and achieve the desired length of conduit, as described above.

FIG. 4 schematically shows an elevational view of the hanging fitting 23 (or hanging fitting 22).

FIG. 4 shows the third element 17 and the upper part of the hanger 23, the latter comprising two levers 25 articulated at 26 of the hanger 23. The lower end of the lever 25 includes a shoe 27 that pivots on the third element 17 when the jack 28 presses the upper end 29 of the lever 15.

With the above structure, the third element 1
7 Even if it is outside the trench, this pipe device 21
can be easily positioned and fixed.

Once the whole is submerged in the trench, it is only necessary to loosen the action of the jack 28, so that it is supported flat inside the trench by all suitable means, and when necessary the device 21 can be released and pulled out of the trench.
This can be used again for other pipe elements.

FIG. 3 shows the second element 12, the guide device and its third hanging fitting 24, the tip of which is wider at the lower end with respect to the inside, and the second
The hanging fitting can be easily fitted onto the end portion 15 of the element 12 from above.

In the drawing, three hanging fittings 22, 23, 24 are schematically shown as being connected by a bar 21, but the actual connection between the three hanging fittings is not accompanied by the necessary rigidity. Needless to say, it will be done.

The construction method of the present invention allows for easy, quick and economical
Continuous elements of conduit can be installed in trenches filled with cement grout or bentonitic mud.

According to the construction method according to the present invention, each time each continuous element is installed, it can be checked whether the previous continuous elements have been installed correctly. The reason is that mud flow and negative pressure effects are distributed throughout the installed continuous elements.

This method was explained above by showing how to fix two pipe elements in a continuous manner in a manhole. If you want to make the pipe elements more complex and change the diameter of the pipe,
It goes without saying that elbow pipes, branch pipes or relay pipes can be fixed by the above method.

The elements of the conduit can be made of various materials, for example asbestos or cement compounds. It is likewise clear that the guide device for guiding the end of one element near the end of an already installed element may be implemented in a different manner without departing from the gist of the invention. be.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view illustrating the method of installing a conduit element in an existing manhole according to the invention. FIG. 2 is a sectional view schematically showing a method of installing a new element in an existing pipe element. FIG. 3 is a schematic sectional view taken along the - line in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along the - line in FIG. 2. 2...Trench, 6'...One opening, 6...
...Other opening, 7...Closing device, 10...Suction tube, 12...Second element, 17...Second element, 30...First element, 13...
... opening of second element, 16 ... temporary closure device, 15 ... end.

Claims (1)

[Claims] 1. In a construction method in which conduit elements are continuously laid in a trench filled with a wall protection fluid such as cement grout or bentonite mud, a closure device 7 to which a suction pipe 10 is attached is connected to one side of the trench. A first element 30 attached to the opening 6' is provided in the trench 2, and adjacent to the other opening 6 of said first element 30, the first element 30 of the second element 12 is provided.
A second element 12 is placed at one end 15 opposite to the second element 12 with a temporary closure device 16 attached thereto, and suction is applied to the interior of the first element 30 and the second element by suction through the suction tube 10. 1
A flow of the wall surface protection fluid is generated near the opening 13 on the first element 30 side of the second element 30, and the second element 12
A conduit characterized in that the opening 13 on the side of the first element 30 is guided to bring the openings of the two elements 30 and 12 into contact with each other, thereby generating negative pressure within each element and joining the elements. Laying method. 2. The conduit laying method according to claim 1, characterized in that another element such as a third element is connected to the second element 12.