JP2001131997A - Method of laying manhole by its cutting in existing buried pipe, and manhole for laying by its cutting in - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify work execution. SOLUTION: A manhole's cutting-in part 2 in an existing buried pipe is bored to be exposed in an excavated hole 5, a manhole 10 provided with a cut part 12 in which the existing buried pipe 1 is engaged is placed in the excavated hole 5, with the manhole interruption part 2 inserted into the cut part 12, to be exposed in an inner cavity 11 from outer parts as a closing body 20 is provided in the inner cavity 11 to isolate an inner cavity part 11U above the cut part 12 from an inner cavity part 11L below the cut part 12, the excavated hole 5 except for the upper inner cavity part 11U is filled with stabilizing liquid B, the closing body 20 is removed after the stabilizing liquid B in the excavated hole 5 is solidified, and solidified matter G and a tube wall of the existing buried pipe 1 between the inner cavity part 11 U and the existing pipe 1 are removed from the upper inner cavity part 11U, thereby the inner cavity 11 of the manhole 10 communicates with the existing pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a manhole in an existing buried pipe and a manhole for laying a manhole.

[0002]

2. Description of the Related Art As shown in FIG.
Numeral 0 is a cylindrical body having a bottom plate 413, and through holes 411, 411 for connecting horizontal pipes are formed in the side walls 414, 414 above the bottom plate 413, respectively. Therefore, in order to insert the human hole 410 into the existing buried pipe, as shown in FIG. The existing buried pipe 401 to be cut is cut off by a predetermined length, and thereafter, between the cut ends 402
It was necessary to insert and lay a human hole 410 in the hole.

[0003]

However, in such a conventional method, it is necessary for an operator to enter the excavation hole and cut off the existing buried pipe for a predetermined length before laying the human hole in the excavation hole. Until the excision work was completed, the drilling hole could not be filled with the stabilizing liquid, so the drilling hole wall had to be held by installing a sheet pile or earth retaining sheet pile, etc. .

On the other hand, when a backhoe or the like is used for digging an existing buried pipe, the existing pipe may be destroyed.

Therefore, a main object of the present invention is to simplify the implementation. Another object is to expose an existing pipe in a digging hole without breaking the existing pipe.

[0006]

According to the present invention, which solves the above-mentioned problems, the invention according to claim 1 digs a human hole interrupting portion in an existing buried pipe, exposes it to the inside of the drilling hole, and at least from inside to outside. A human hole provided with a cutout portion into which the existing buried pipe is fitted until exposed to the air is laid in the excavation hole, and the human hole interruption portion is inserted into the cutout portion, and the inside of the existing buried pipe is removed. Except, at least the space in the excavation hole below the notch portion is filled with a solidified material, and after solidification of the solidified material, the inner space of the human hole communicates with the existing pipe. This is a method of laying a human hole in an existing buried pipe.

According to a second aspect of the present invention, a human hole interrupting portion of an existing buried pipe is dug and exposed in the excavation hole.
A human hole provided with a cutout portion into which the existing buried pipe is fitted at least until it is exposed from the outside into the inside space, a lid portion is provided in the inside space, and the inside space portion above the notch portion is cut out. Laying in the drilling hole and inserting the manhole interruption portion in the cutout portion, while being isolated from the inner space portion below the lower portion, and excluding the inner space portion above the lid portion, Is filled with a stabilizing liquid, and then, after solidifying the stabilizing liquid in the borehole, the lid is removed,
The solidified body between the hollow portion and the existing pipe and the pipe wall of the existing buried pipe are removed from the hollow portion above the notch, and the hollow space of the human hole and the existing pipe are communicated. A method of laying a human hole in an existing buried pipe.

The invention according to claim 3 is the method according to claim 1 or 2, wherein, at the time of digging of the human hole interruption portion, at least the underground portion of the existing pipe is excavated by high-pressure injection of fluid to the portion. This is a method of laying a human hole in an existing buried pipe.

On the other hand, the invention according to claim 4 is an interruption laying manhole used when laying a manhole on an existing buried pipe, wherein the manhole is at least exposed from the outside to the inside. It is a manhole for laying an interruption, characterized in that a cutout portion into which an existing buried pipe is fitted is formed.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. <Drilling Step> In the present invention, first, a human hole interrupting portion of an existing buried pipe is dug to be exposed inside the drilled hole. Therefore, for example, as shown in FIG.
Backhoe 3 around the ground around the manhole interruption part 2
And drilling holes 5 are formed. At this time, earth removal and mud removal are performed by, for example, a backhoe or an air lift.

However, since it is difficult to excavate to the backside ground portion (lower side in the case shown) 4 of the existing buried pipe 1 by using a digging machine 3 such as a backhoe during such digging, the backside ground portion 4 is difficult to dig. The operator enters the drilling hole 5 and excavates or removes it, or preferably inserts the injection pipe 6 having the injection port 6a at the tip into the drilling hole 5 as shown in FIGS. In a state where the injection port 6a faces the side of the back ground portion 4 of the existing buried pipe, a fluid (particularly, a liquid such as water) is injected at high pressure to the back ground portion 4 through the injection pipe 6, The back ground portion 4 is excavated (cut). In particular, as shown in FIG. 3, excavating efficiency can be increased by injecting the fluid in a fan shape according to the shape and structure of the injection port. Then, the entire backside ground portion 4 is excavated while rotating the injection pipe 6 around the axis or moving the injection pipe 6 in the longitudinal direction of the existing pipe 1.

Of course, the excavation can be performed on other parts by the fluid high-pressure injection. Although not shown, for example, excavation with a backhoe may be performed to the extent that some soil cover remains on the existing buried pipe, and the remainder may be removed by excavation with high-pressure fluid injection.

In this way, excavation is performed up to the ground portion 4 on the back side of the existing buried pipe 1 while preventing the existing buried pipe 1 from being destroyed.
At least the entire peripheral surface of the manhole interruption part 2 can be exposed in the borehole 5. Further, if drilling is performed using a stable liquid component such as water as the high-pressure jet fluid, drilling mud can be used as a later stable liquid material, and there is an advantage that it is not necessary to take out from the drill hole 5 and perform post-treatment such as disposal. is there.

<Manhole laying step> Next, a manhole is laid.
In the present invention, as shown in FIGS. 4 and 5, a human hole 10 having a cutout portion 12 into which the existing pipe 1 is fitted at least until the internal pipe 11 is exposed from the outside is used. In the illustrated human hole 10, the bottom plate 13 is cut out along the radial direction with a width equal to or larger than the outer diameter of the existing pipe 1, and the side wall 14 is connected to one end and the other end in the radial direction of the cutout portion of the bottom plate. Is cut out along the vertical direction to a predetermined connection portion with a width equal to or larger than the outer diameter of the existing pipe 1, thereby forming the notch 12 of the present invention into which the existing pipe 1 is fitted with some play.

More preferably, as shown in FIG. 6, a closing body 20 is provided in the human hole 11 to isolate the inner space 11U above the notch 12 from the inner space 11L below the notch. State. A specific example of the closing body 20 is shown in FIGS. That is, the inner wall surface 1 of the human hole 10
5 are driven in a two-step manner while being spaced apart in the circumferential direction, and brackets 23, 23 are connected and fixed to the upper and lower hole-in anchors 22, 22 by nuts 24, 24, respectively. A plurality of control panels 21, 21... Stacked between the upper and lower brackets 23 are clamped and fixed as a closing body 20. Therefore, the closing body 20 is detachable from the inside of the human hole 11 (when it is removed, the nut connection between the bracket 23 and the hole-in anchor 22 may be released).
Further, in the illustrated example, an air vent pipe 25 whose lower end penetrates the closing body 20 and opens on the lower side of the closing body 20 and whose upper end projects at least from the upper opening 16 of the human hole is provided.

Further, in the illustrated example, a steel material such as H steel is used to increase the weight of the human hole 10 and stably immerse it in the stabilizing solution and place it thereon, and to protect the outer wall of the human hole. 31,
The three-dimensional frame pedestal 30 formed by 31.
It is integrated on the outer surface.

On the other hand, when the setup is completed, an integrated human hole (hereinafter also simply referred to as a human hole) 10 is suspended in the excavation hole 5 as shown in FIGS. The manhole interruption part 2 of the existing pipe 1 is fitted in the cutout 12 and the interruption part 2 of the existing pipe 1 is stored in a predetermined connection position in the manhole 10. At this time, it is preferable that the entire periphery of the manhole interruption portion 2 of the existing pipe 1 is exposed in the manhole space 11 as shown in the illustrated example, but only an appropriate part, for example, only the upper half, is formed in the manhole space. 11 may be exposed (not shown). As described above, in the present invention, the human hole 10
The existing pipe 1 is not cut off before laying. Further, the above-described closing body 20 may be attached to the human hole 10 after the human hole 10 is laid in the excavation hole 5.

<Filling / solidifying step of solidified material> Further, for example, after the human hole is laid, as shown in FIG. 11, the inside of the excavation hole 5 excluding the inner space portion 11U above the closed body 20 in the human hole 10 ( That is, the gap between the outer surface of the manhole 10 and the inner surface of the excavation hole 5 and the gap between the inner space 11L of the manhole below the closed body 20 and the outer surface of the existing pipe 1) are filled with the stable liquid B. For this reason, in the illustrated example, the stable liquid level B1 is positioned below the upper opening 16 of the human hole. In this case, air bubbles tend to accumulate below the closing body 20 in the human hole 10 in particular.
Since the air vent pipe 25 that penetrates through the air outlet 0 is provided, air bubbles below the closing body 20 are exhausted to the ground via the air vent pipe 25. Further, as the stabilizing liquid B, mud generated by the above-described excavation step can be used.

Subsequently, the stable liquid B is solidified by mixing a solidifying material and stirring to form a solid G as shown in FIG. Air stirring is preferable as the stirring method. In this air stirring, there is a concern that bubbles and the like are formed and remain in the solidified body G, but in this example, the stable liquid B is used.
Among the air supplied into the solidified body G, the air that reaches the lower side of the closed body 20 in the human hole 10 is exhausted from the stable liquid level B1 by the above-described air vent pipe 25. Bubble formation is effectively prevented.

In the present invention, it is sufficient that at least the space in the excavation hole below the notch except the inside of the existing buried pipe is filled with the solidified material. Therefore, it is not always necessary to use the stabilizing liquid, and it is not necessary to perform the filling and solidification of the solidifying material over the entire space in the borehole at one time.
For example, although not shown, the excavated hole is filled with the solidified material at least twice, and in the first filling, the solidified material upper surface is slightly higher than the cutout of the human hole, and the cutout except for the existing pipe is formed. After the first solidification of the solidified material, a second solidification material filling is performed between the outer surface of the human hole and the wall surface of the excavation hole on the solidified body after the first solidification of the solidified material. By doing so, it is possible to form a solidified body similar to the case where the lid is provided, without providing the above-described closing body. In this case, the remaining space can be backfilled by using a known backfill material such as earth and sand instead of the solidified material to be filled for the second time.

<Connecting Step> When the filling and solidification of the solidified material is completed, an operator enters the inner space portion 11U above the notch portion 12, and first removes the closing body 20 (in this case, the illustrated example) In this case, it is preferable that the bracket 23 and the hole-in anchor 22 are also removed or cut off), and then, as shown in FIG. 12 or 15, for example, the solidified body of the lower inner space 11L (the upper inner space 11U and The solidified body between the existing pipe 1) and the pipe wall at the interruption part 2 of the existing pipe 1 are removed by cutting or the like, and the inside of the human hole 11 and the inside of the existing pipe 1 are communicated.

In this case, it is possible to remove only the upper part of the interruption part 2 in the existing buried pipe 1 as shown in FIGS. 12 to 14, or to cut and remove the entire interruption part 2 as shown in FIG. In the former case, the lower inner space portion 11
L, only the upper part of the solidified body formed in L is removed, and the remaining embedded solid pipe on the upper surface G1 of the remaining solidified body has an edge of the existing embedded pipe 1.
It is preferable that the upper surface G1 of the remaining solidified body has an inclined surface descending to the upper cutout opening of the existing buried pipe 1 as a whole. In the latter case, the connection state is similar to that in the case where the human hole interruption part 2 is cut before the conventional manhole laying in that the human hole interruption part 2 is cut off.

After the connection, for example, the human hole 1
At the same time, the manhole cover 40 is attached to the surface 0, and the pavement 50 is provided on the upper side of the solidified body G to complete the execution of the manhole interruption laying.

<Others> (A) In the above example, the closing body 20
Is provided to isolate the inner space 11U above the notch 12 from the lower inner space 11L below the notch. In this case, the solidified body is in the lower inner space 11L. Since it is formed, it is necessary to remove the solidified body in the portion. Therefore, according to the third aspect of the present invention, as shown in FIGS. 16 and 17, instead of the closing body 20, the arched lid 6 along the cutout surface 12F of the cutout 12 is provided.
0, thereby closing the notch 12M. In addition to the above, the basic structure is the same as that of the above example. Work in the same way. When the arched lid 60 is used, the entire inner space 11 of the human hole (excluding the cutout portion) is isolated from the outside and is not filled with the solidifying material. Such a removal operation is substantially unnecessary. Although not shown, the arched lid 60 can be attached to the human hole 10 by using an appropriate attachment such as a hole-in anchor or a bracket, similarly to the closing body of the above example.

In particular, such an arched lid 60 is used, and the connection between the existing buried pipe 1 and the human hole 2 is made as shown in FIG.
When only the upper part of the interruption part 2 of the existing buried pipe 1 is cut off as shown in FIG. 14, at least prior to the removal of the arch-shaped lid 60, the cut portion of the human hole 10 and below are cut off as shown in FIG. Is filled with the filler 65 such as concrete in the lower inner space portion 11L, and the height position of the edge of the existing buried pipe on the filler upper surface 65a becomes the side cut surface of the existing buried pipe 1. 66, and if the entire upper surface 65a of the filler is formed as an inclined surface that descends to the upper resection opening of the existing buried pipe 1, there is an advantage that the subsequent connection work is simplified.

(B) In the present invention, in order to maintain the hole wall,
After filling the inside of the borehole with the stabilizing liquid, a human hole may be laid. In this case, a guide member is provided in the borehole so as to protrude from the stable liquid level, and the manhole is suspended in the borehole along the guide member, thereby automatically burying the existing hole in the notch of the manhole. Preferably, the tube is fitted (not shown).

(C) In the above example, the existing pipe is fitted into the cutout along the vertical direction from below the bottom portion, but the present invention is not limited to this. For example, FIG.
As shown in FIG. 9, a notch 112 is formed so that the existing pipe 1 is fitted along the lateral direction from the side of the human hole 110 to a predetermined connection portion, or the human hole 210 is formed as shown in FIG.
The notch 212 can be formed so that the existing pipe 1 can be fitted along the diagonal direction from the lower end corner to the predetermined connection portion. These examples are suitable when the existing pipe 1 cannot be exposed at the center of the excavation hole 5.

(D) The shape of the notch can be determined as appropriate. For example, as shown in FIG.
If the hole 12 is suspended downward and spreads, particularly in the case where a human hole is laid after filling the inside of the drilling hole with the stabilizing liquid, the existing pipe can be easily and smoothly inserted. become.

(E) The human hole of the present invention can be manufactured by modifying the conventional manhole such as cutting off a predetermined portion or the like, but can also be integrally formed with a notch from the beginning. .

(F) In the present invention, in addition to the air vent pipe 25 in the above-described example, a blow pipe for discharging a stabilizing liquid or a stabilizing liquid mixed with a solidifying material outside the closing body or the lid, or a blowing pipe outside the closing body or the lid. The solidifying agent injection pipe for supplying the solidifying material to the pipe can be provided in parallel with or instead of the air release pipe. As an example of this, when the disc-shaped closing body 20 is used, the blow pipe 26 and the injection pipe 27 together with the air release pipe 25 are used.
FIG. 22 shows an example in which the blow pipes 26 and the injection pipe 27 are juxtaposed together with the air release pipe 25 when the arch-shaped lid 60 is used. The blow tube 26 and the injection tube 27 are connected to, for example, a blow pump and an injection material supply device (not shown).

[0031]

As described above, according to the present invention, the implementation can be simplified. In addition, the existing pipe can be exposed in the digging hole without being destroyed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an excavation process using a backhoe.

FIG. 2 is a longitudinal sectional view showing an excavation step by high-pressure fluid injection according to the present invention.

FIG. 3 is a plan view showing an excavation step by high-pressure fluid injection according to the present invention.

FIG. 4 is a perspective view of a human hole according to the present invention.

FIG. 5 is a side view of a human hole according to the present invention.

FIG. 6 is a vertical sectional view of a human hole according to the present invention.

FIG. 7 is an enlarged view of a portion VII in FIG. 6;

FIG. 8 is a cross-sectional view of FIG.

FIG. 9 is a longitudinal sectional view showing a human hole laying step.

FIG. 10 is a longitudinal sectional view showing a human hole laying step viewed from another direction.

FIG. 11 is a vertical sectional view showing a filling step of a stabilizing solution.

FIG. 12 is a longitudinal sectional view showing a process of connecting a human hole to an existing pipe.

FIG. 13 is a vertical cross-sectional view showing a connection process between a human hole and an existing pipe, as viewed from another direction.

FIG. 14 is a vertical cross-sectional perspective view showing a process of connecting a human hole to an existing pipe.

FIG. 15 is a longitudinal sectional view showing another process of connecting a human hole to an existing pipe.

FIG. 16 is a side view showing another inside and outside isolation mode of the human hole.

FIG. 17 is a partial cross-sectional perspective view showing another inside and outside isolation mode of a human hole.

FIG. 18 is a partial cross-sectional perspective view showing a form in which a filler is filled.

FIG. 19 is a longitudinal sectional view showing another example of a notch.

FIG. 20 is a longitudinal sectional view showing another example of a notch.

FIG. 21 is a longitudinal sectional view showing another example of a notch.

FIG. 22 is a longitudinal sectional view showing an example of a human hole provided with a blow pipe and a solidification material injection pipe.

FIG. 23 is a longitudinal sectional view showing an example of a human hole provided with a blow pipe and a solidification material injection pipe.

FIG. 24 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

1 ... existing buried pipe, 10 ... human hole, 11 ... empty in human hole, 12 ...
Notch, 20 ... closed body.

Claims (5)

[Claims] 1. A human hole provided with a cut-out portion into which a human hole interrupted portion of an existing buried pipe is digged and exposed inside the digging hole, and into which the existing buried pipe is fitted at least until it is exposed from the outside to the inside. Laying in the excavation hole and inserting the manhole interruption portion into the notch portion, and at least the space in the excavation hole excluding the inside of the manhole except the notch portion and the inside of the existing buried pipe is solidified. After the solidification of the solidified material, the inside of the manhole and the inside of the existing pipe are communicated from the inside of the manhole. Method. 2. A human hole having a cut-out portion into which a human hole interruption portion of an existing buried pipe is digged and exposed in a digging hole, and into which the existing buried pipe is fitted at least until it is exposed from the outside to the inside. A occluding body is provided in the inner space, and the inner space above the notch is separated from the inner space below the notch, and is laid in the excavation hole and the person is inserted in the notch. While inserting the hole interruption part, the inside of the drilling hole excluding the inner space above the closing body is filled with the stabilizing liquid, and after that, after solidifying the stabilizing liquid in the drilling hole, the closing body is removed. Removing the solidified body between the hollow portion and the existing pipe and the pipe wall of the existing buried pipe from within the hollow portion above the notch, and removing the inner space of the human hole and the inside of the existing pipe. To communicate with existing buried pipes Interrupt laying method of people holes. 3. A human hole provided with a cut-out portion into which a human hole interrupted portion of an existing buried pipe is dug and exposed in the digging hole, at least until the exposed buried pipe is exposed from the outside to the inside. Laying in the excavation hole and inserting the human hole interrupting portion into the notch, and excluding the inside of the existing buried pipe, with the opening of the notch closed by a lid along the notch surface. Filling the space in the borehole between the outer surface of the borehole including the body and the inner surface of the borehole with a stabilizing liquid, and then solidifying the stabilizing liquid in the borehole and removing the lid, Removing the solidified body between the inner space and the existing pipe and the pipe wall of the existing buried pipe from the inner space side, and communicating the inner space of the human hole with the inside of the existing pipe; How to lay a manhole on a pipe. 4. The digging of the human hole interruption part,
The excavation is performed by high-pressure injection of fluid to the portion at least on the backside ground portion of the existing pipe.
3. The method for laying a human hole in an existing buried pipe according to any one of the items 3). 5. A notch for laying an interrupter, which is used when laying a human hole in an existing buried pipe, wherein the notch in which the existing buried pipe is fitted at least until it is exposed from the outside to the inside. A manhole for interrupt laying, characterized in that a part is formed.