JPH05106394A - Burying method for small-diameter pipe - Google Patents

Abstract

PURPOSE:To secure the workability and safety when burying small-diameter pipes such as sewer pipes and reduce the troubles given to general citizens during construction. CONSTITUTION:A starting vertical shaft 25 required to advance and press an arch-like metal casing 11 into the ground is provided, and the first metal casing 11 is arranged in the starting vertical shaft 25 so that its position in the advance direction can be restricted when it is pressed in by a hydraulic jack 31. The soil in the pressed-in metal easing 11 is excavated and discharged, the first metal casing 11 is advanced and pressed by the next metal casing 11 like billiards, and soil is again excavated and discharged. The similar work is repeated thereafter until the first metal casing 11 reaches a manhole 43 to form a space section. Small-diameter pipes are connected to each other and installed on a pipe base installed on the bottom face of the space section. The forefront small-diameter pipe is connected to the manhole 43, then granular crushed stones are filled in the space section to bury the small-diameter pipes.

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 small-diameter pipes, and more particularly to various existing buried pipes such as water pipes and gas pipes in the soil where small-diameter pipes such as sewer pipes are to be buried. The present invention relates to a method for burying a small-diameter pipe that is suitable when there is a buried obstacle such as a gutter.

[0002]

2. Description of the Related Art Construction methods for burying various small diameter pipes such as sewer pipes are roughly classified into open-cut construction methods and other special construction methods.

Of these, the excavation method is a method of digging from the road surface side by using mechanical force, but if there are buried obstacles such as telephone line pipes, water pipes, gas pipes and water channels underground, they will not be damaged. In addition to the inconvenience of having to rely on human power as described above, there is the inconvenience of having to cut off traffic for construction in places where vehicle traffic is frequent, such as at intersections.

On the other hand, in the special construction methods other than the above-mentioned open-cut construction method,
There are propulsion method, shield method, mountain tunnel method, etc. Among them, the propulsion method includes the blade edge type propulsion method,
There are semi-shield construction method and small-diameter propulsion method.

In the blade edge type propulsion method among the above propulsion methods, the blade tip is attached to the tip of the propulsion pipe to excavate the natural ground manually, and the excavated soil is carried in the pipe by a bucket or a conveyor, etc. It is carried out of the mine using a crane, etc.
This is a method of propelling a propulsion pipe by using a propulsion press-fitting device composed of a spacer, a push ring, a bearing wall, and the like.

[0006]

By the way, the inconveniences found in the excavation method can also be eliminated by the blade edge type propulsion method.

However, when a fume tube having a diameter of about 800 mm is used as the propulsion pipe, there is a lot of friction during the press-fitting of the propulsion pipe. Therefore, the propulsion press-fitting device becomes large and the cost becomes high, and the propulsion press-fitting device becomes large. As a result, the starting shaft also has to have a wide opening surface with a diameter of about 6 m, which causes a problem of increasing the factors that hinder general traffic.

Further, since the blade end is attached to the tip of the propulsion pipe, it is necessary to provide a reach shaft because it is necessary to collect the blade, which causes the inconvenience that the work becomes complicated.

Further, even when a metal pipe is used as the propulsion pipe, excavation of soil in the propulsion pipe is inferior in workability due to its narrow diameter of about 800 mm and the propulsion pipe itself is curved. As a result, the laying position of the small diameter pipe is also regulated by the propulsion pipe.As a result, even if the small diameter pipe is laid with the correct position, it will be difficult unless the propulsion pipe itself is accurately press-fitted. there were.

[0010]

The present invention is based on the conventional construction method,
In particular, the present invention has been made in view of the above problems found in the blade edge type propulsion method, and the structural features thereof are 1000 to 120.
Having a seating height of around 0 mm, and providing a starting shaft necessary for thrusting the arched metal casing having a wall thickness of around 8 to 12 mm into the soil of a predetermined depth,
A first metal casing is arranged in this starting shaft so that the position in the propulsion direction can be regulated at the time of press-fitting with a hydraulic jack, and the press-fitting is performed using the hydraulic jack to excavate and exclude soil in the metal casing. Second placed next
The first metal casing is thrust into the first metal casing by pushing the first metal casing into the shape of a bead, and the soil in the first metal casing is excavated again. Then, the same press-fitting excavation work is performed on the manhole side located in the thrust direction. By repeatedly performing the process until the first metal casing reaches, a space with a series of metal casings as a protective wall is formed, and the inclination angle defined by the nozzle stipulated on the bottom of this space is also adjusted. After connecting the small-diameter pipes with each other and laying them on the nozzle, and connecting the front end of the small-diameter pipe located at the tip of the pipe to the manhole, fill the space with fine granular crushed stones and It is to bury the caliber pipe.

In the present invention, the position of the metal casing in the propulsion direction is restricted by a propulsion position restricting table in which a guide flange is provided on the lower end edge of the metal casing and the metal casing is fixed to guide the metal casing in the propulsion direction. It is preferable to mount the guide flange.

[0012]

Therefore, the metal casing has a wall thickness of 8 to
Since it is formed with a relatively thin thickness of around 12 mm, it is possible to reduce friction when press-fitting it into the soil. Therefore, even if a relatively small and inexpensive hydraulic jack is used, Can be easily pressed into the soil.

Further, the propulsion press-fitting of the metal casing using such a hydraulic jack can be made relatively compact in terms of equipment, and therefore the opening surface of the starting shaft can be made so small. ..

Furthermore, excavation of soil in the metal casing
Since the work can be performed while ensuring a space with a height of around 1000 to 1200 mm, workability can be improved, and work can be performed safely using an arch-shaped metal casing with high pressure resistance as a protective wall. Can be carried out.

Further, since the small-diameter pipe can be laid on the basis of the bottom surface having a sufficient width ensured by the metal casing, the accuracy can be adjusted with a sufficient margin.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an example of a state in which the first metal casing reaches the manhole according to the present invention, which is necessary for thrusting the metal casing 11 into the soil 41 having a predetermined depth. Hydraulic jack 31 which is stably installed on the bottom surface 27 of the starting shaft 25 formed by ensuring a sufficient space through the bearing wall member 34 and the jack base 35.
And a plurality of metal casings 11 which are placed on the propulsion position regulating table 17 which is accurately positioned and fixed on the bottom surface 27 and which are sequentially propelled by the hydraulic jack 31 until reaching the manhole 43 side. This is done by using and.

The reference numeral 33 in the figure denotes the oil feed pipes 32, 3
A hydraulic control unit disposed on the road surface 40 for controlling the operation of the hydraulic jack 31 via
Reference numeral 2 is a buried obstacle such as a water pipe, a gas pipe, or a gutter already buried in the soil 41.

FIG. 2 is a detailed view showing an example of the metal casing 11 and the propulsion position restricting stand 17 shown in FIG.

As shown in FIG. 1, the metal casing 11 includes a pressure-resistant top wall portion 12 formed in a curved shape, vertical supporting wall portions 13 and 13 for supporting the pressure-resistant top wall portion 12, and these vertical supporting wall portions 13 and 1.
3 and the guide flange portions 14 and 14 extending in the horizontal direction that intersect the lower end edge of the guide portion 3 and are formed in an arc shape having high pressure resistance as a whole.

Regarding the standard size of the metal casing 11 having such a structure, in addition to the relationship with the diameter of the small diameter pipe 36 embedded as shown in FIG. 4, which will be described later,
It is possible to employ an appropriate one that is suitable in terms of ensuring workability of the worker 44 and pressure resistance.

To show this concretely, the sitting height is 1
000 to 1200 mm, preferably 1100 mm, width 700 to 900 mm, depth 1500
Those having a size of about mm can be preferably used.

Further, the metal casing 11 having the above-mentioned standard size is used to reduce friction during propulsion press-fitting into the soil 41, and to obtain necessary and sufficient pressure resistance.
It is desirable to use an iron plate material having a wall thickness of about 12 mm, preferably about 9 mm.

Further, in the metal casing 11, the guide flange portion 14 extending in the horizontal direction intersecting with the lower end edge of the vertical support wall portion 13 has the portion located on the inner side as shown in the example on the outside. It can be formed to be longer than the located portion, and if necessary, the outer portion can be formed to be longer than the inner portion, or can be formed to project only in one direction.

On the other hand, the propulsion position restricting base 17 has a base 22
Horizontal placement pieces 19 and 19 are formed between the pair of upright support pieces 18 and 18 which are erected upright so as to be substantially T-shaped. A pair of position regulating standing pieces 20, 20 are erected along the horizontal mounting piece 1, and the horizontal placing piece 1 is partitioned by these position regulating standing pieces 20, 20.
A mounting surface 21 for the guide flange portion 14 of the metal casing 11 is formed at 9. In addition, it is preferable that the propulsion position restricting stand 17 having such a structure is formed by using a metal material such as an iron plate material having a wall thickness similar to that of the metal casing 11.

Thus, after the starting point for burying the small-diameter pipe 36 in the manhole 43 is determined, first, the starting shaft 25 required for thrusting the metal casing 11 into the soil 41 having a predetermined depth is formed. It is provided.

After the starting shaft 25 is provided, the hydraulic jack 31 and the propulsion position restricting base 17 are installed at predetermined positions, and the mounting surface 21 of the stationary propulsion position restricting base 17 is placed.
The guide flange portion 14 is placed on the first metal casing 11 so that the first metal casing 11 can be regulated in its propelling direction during press fitting. The hydraulic jack 31 is
It is desirable to use, for example, two units in order to press the vertical supporting wall portions 13 in the metal casing 11 in a laterally balanced manner.

After the positional relationship among the hydraulic jack 31, the propulsion position restricting base 17 and the metal casing 11 is determined in this way, the hydraulic jack 31 operation-controlled by the hydraulic control unit 33 first causes the first metal The casing 11 is soil 41 along the mounting surface 21 of the propulsion position regulation stand 17.
It is pressed in.

The first metal casing 11 is press-fitted,
After excavating and removing the soil 41 in the metal casing 11, the second metal casing 11 is installed on the propulsion position restricting stand 17 in the same manner as the first metal casing 11, and the end faces of the first metal casing 11 are mutually opposed. While pressing the second metal casing 11 with the hydraulic jack 31,
The first metal casing 11 is accurately positioned and fed in a bead shape, and the first metal casing 11 is again fed.
Excavate and remove the soil 41 inside.

FIG. 3 is an explanatory view exemplifying an outline of excavation work carried out at this time. For example, a traveling gate type crane 46 is arranged on the opening surface 26 of the starting shaft 25, and a new metal casing 11 is sequentially installed. The worker 44 enters the space portion 16 secured by press-fitting in the shape of a bead, and the excavated soil 48 excavated from the soil 41 in the first metal casing 11 is put into the tumbling bucket 45, and the traveling gantry crane is installed. It is carried out by carrying out to the dump truck 47 using 46.

In this way, the space 16 is extended by excavating and removing the soil 41 in the portion where the first metal casing 11 is located, and the same work is performed by the first metal casing 11 reaching the manhole 43. The space portion 16 extending from the starting shaft 25 to the manhole 43 is formed by repeating the above steps.

The cutout portion 1 as shown in FIG. 2 is provided on the tip edge side of the pressure resistant top wall portion 12 of the first metal casing 11.
In the case where 5 is provided in advance, the matching can be brought into contact with the manhole 43 as shown in FIG.

Thus a series of metal casings 11, 1
After the space 16 having the protective walls 1, ... Is formed, the hydraulic jack 31, the propulsion position restricting stand 17, and the like are carried out from within the starting shaft 25, and then a single hume pipe or the like is used. A pair of nozzles 37, which are formed of an appropriate material such as wood, for the small-diameter pipe 36 are provided in the metal casing 11.
Is placed on the bottom surface 27 side of the.

In this case, the small diameter pipe 36 is provided with a predetermined inclination angle on the nozzle base 37, and is stably mounted via the supporting member 38 attached thereto. Originally, the small diameter pipes 36 are connected to each other up to the manhole 43.

Thus, the small-diameter pipe 36 located at the leading edge
After the front end of the manhole 43 is connected to the manhole 43 and the installation work is completed, for example, fine crushed stones 39 that are pressure-fed through a pipe line (not shown) are jetted into the space portion 16. As shown in FIG. 4, the granular crushed stones 39 are sequentially filled from the inner side to complete the burying operation of the small diameter pipe 36.

The fine crushed stone 3 used in this case
It is preferable to use No. 9 having a particle size of about 5.0 to 2.5 mm from the viewpoint of smoothly and surely performing the filling operation.

Since the present invention is constructed in this way, the metal casing 11 formed to have a relatively thin wall thickness of about 8 to 12 mm reduces friction during press fitting into the soil 41. Therefore, propulsion press-fitting can be easily performed using the relatively small and inexpensive hydraulic jack 31.

For this reason, the hydraulic jack 31 can be replaced by an appropriate simple device such as utilizing the hydraulic system of a forklift truck without using a dedicated machine.

Further, since the propulsion press-fitting of the metal casing 11 using such a hydraulic jack 31 can be made relatively compact in terms of equipment, the opening surface 26 of the starting shaft 25 is also made smaller by that much. Therefore, the work area occupied on the road surface 40 can be narrowed to reduce the factors that cause traffic congestion, and the work of burying the small diameter pipe 36 can be performed.

In addition, the metal casing 1 is propulsively press-fitted.
Since the excavation of the soil 41 in 1 can be performed in the space part 16 which has a height of about 1000 to 1200 mm and is secured, the fatigue of the worker 44 is reduced and the work is smoothly performed. In addition to being able to work, an arch-shaped metal casing 11 composed of a pressure-resistant top wall portion 12 and a vertical support wall portion 13 during work
You can proceed with the work safely using the as a protection wall.

Further, since the small-diameter pipe 36 can be laid on the basis of the bottom surface 27 having a sufficient width secured by the metal casing 11, a sufficient margin space up to the manhole 43 is secured. Work can be carried out while adjusting the laying position accuracy.

The small-diameter pipe 36 in the present invention is not limited to the sewer pipe, but may be another buried pipe such as a gas pipe or a water pipe if necessary.

[0043]

As described above, according to the present invention, it is possible to secure a space necessary for burying a small diameter pipe by using a metal casing capable of reducing friction during press fitting. The necessary equipment such as a hydraulic jack can be installed even with a start shaft with a relatively small opening surface, and the construction period can be shortened compared to the open-cut method and other propulsion methods, and small-diameter pipe burial work It is possible to eliminate as much as possible the road obstruction factors on the road surface, which helps to secure the public interest.

Further, since the propulsion press-fitting of the metal casing is performed while restricting the propulsion direction of the metal casing, the buried small-diameter pipe can accurately reach the manhole to be connected.

Moreover, excavation of soil in the metal casing is
Since it can be carried out in a space portion having a height of about 1000 to 1200 mm, it is possible to reduce the fatigue of the worker and improve the work efficiency, and the worker at the time of excavation work is arch-shaped. The work can be safely carried out by using the metal casing of as a protection wall.

Further, the small-diameter pipe is adjusted with reference to the bottom surface having a sufficient width ensured by the metal casing, so that the position accuracy is adjusted by using the sufficient position adjustment space secured up to the manhole. However, since it can be laid accurately, it is possible to achieve higher working accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a propulsion press-fitting state of a metal casing according to the present invention.

FIG. 2 is an overall perspective view showing an example of a mutual relationship between a metal casing and a propulsion position restricting base in the present invention.

FIG. 3 is an explanatory view showing an example of a state of excavation work in the present invention.

FIG. 4 is a vertical cross-sectional view showing an example of an embedded state of a small diameter pipe according to the present invention.

[Explanation of symbols]

 11 Metal Casing 12 Pressure-Resistant Top Wall 13 Vertical Support Wall 14 Guide Flange 15 Cutout 16 Space 17 Propulsion Position Control Stand 18 Standing Support 19 Horizontal Mounting 20 Position Control Stand 21 Mounting Surface 25 Starting shaft 26 Opening surface 27 Bottom surface 31 Hydraulic jack 32 Oil supply pipe 33 Hydraulic control unit 34 Pressure bearing wall material 35 Jacquis table 36 Small diameter tube 37 Tube base 38 Supporting member 39 Fine granular crushed stone 40 Road surface 41 Earth 42 Obstacle 43 Manhole 44 worker

Claims (2)

[Claims] 1. A start required for propelling and pressing an arched metal casing having a seat height of about 1000 to 1200 mm and a wall thickness of about 8 to 12 mm into soil of a predetermined depth. A vertical shaft is provided, and the first vertical metal casing is arranged in the starting vertical shaft so that the position of the propulsion direction can be regulated when the hydraulic jack is used for press fitting, and the hydraulic jack is used to press-fit the soil in the metal casing. Excavation is eliminated, and then the second metal casing placed next propels the first metal casing into a bead shape to excavate the soil in the first metal casing again. By repeating the work until the first metal casing reaches the manhole side located in the propulsion direction, a space part with a series of metal casings as a protective wall is formed. In addition, the small-diameter pipes are connected to each other under the inclination angle specified by the nozzle that is fixed on the bottom of this space and laid on the nozzle. A method for burying a small-diameter pipe, characterized in that the front end portion is connected to the manhole, and then the space portion is filled with fine granular crushed stone to bury a small-diameter pipe. 2. The position regulation of the metal casing in the propulsion direction is performed by providing a guide flange on a lower end edge of the metal casing, and a guide position flange on a propulsion position regulation base fixed to guide the metal casing in the propulsion direction. The method for burying a small-diameter pipe according to claim 1, characterized in that