JPH03103529A - Drive burying method of buried pipe - Google Patents

Abstract

PURPOSE:To execute long distance burying work by connecting the foremost connecting shaft body to a guide body provided with an intrusive cylinder capable of expansion on the end thereof and, at the same time, inserting a buried pipe in the peripheral surface of the connecting shaft body, and extending the connecting shaft body and buried pipe respectively to bury them. CONSTITUTION:A buried pipe 3 is buried in the horizontal direction from the side of a vertical shaft V. A guide body 1 provided with an intrusive cylinder 10 and a connecting shaft body 2 having about the same outside diameter as an outward form of a guide body 1 are subsequently added to the end of a buried device. Then, an expansion mechanism 4 is provided to a part of the added connecting shaft body 2, the pressure media is supplied to push the expansion mechanism to the internal wall of the buried pipe 3, and it is held and fixed to the connecting shaft body 2. After that, thrust is applied to the ultimate rear of the connecting shaft body 2 in the horizontal direction from an initial pushed jack provided to the vertical shaft V, and it is driven into the subsoil E. According to the constitution, stress occurring in the buried pipe 3 is controlled low down, and drive burying executing can be carried out by making use of the buried pipe 3 inferior in yield strength.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for promoting and burying buried pipes, and in detail,
The present invention relates to a method of burying underground pipes such as vinyl chloride pipes in sewer construction work by sequentially advancing the pipes into the holes while forming holes in the ground.

[Conventional technology]

Conventionally, the methods of forming a buried hole that have been generally adopted can be roughly divided into two types: a consolidation type, in which the ground is compacted using the outer periphery of a lead pipe, etc., and a type in which the ground is excavated with an auger hesode, etc. Soil is classified into excavation types, in which the auger head is propelled while the soil is taken into a connecting pipe connected to the auger head and removed.

Among these, the excavation type forms a large-diameter buried hole,
In contrast, the consolidation type is mainly used for forming buried holes in hard ground, whereas the consolidation type does not require a complicated drive mechanism and can be performed with a simple device, so it can be used for making buried holes with relatively small diameters. Applicable when forming a In addition, in conditions where the ground is soft and will collapse immediately after excavation, the surrounding wall of the burial hole should be consolidated and reinforced. It is said that a compacted type that can be used is preferable.

Therefore, when burying a relatively small-diameter buried pipe made of a soft material such as vinyl chloride, the above-described consolidation type buried hole-shaped device or buried hole shape or method is often adopted.

A specific example of a method for promoting and burying buried pipes using the consolidation type is shown below.

Using a leading tube with a telescopic penetration cylinder at the tip,
When the penetration cylinder is extended and penetrated into the ground while compacting the ground, a hole corresponding to the outer diameter of the penetration cylinder is formed. Next, while retracting the penetration cylinder, the leading pipe is propelled while keeping the tip of the penetration cylinder stationary. By repeating the gradual expansion and contraction movement of the penetration cylinder and the thrust movement of the leading pipe, the buried hole is shaped. To propel the leading pipe, the rear end of the connecting pipe connected to the rear of the leading pipe is pushed by a mower installed in the starting shaft to transmit thrust to the leading pipe. After the leading pipe is propelled to the target shaft, the leading pipe and the connecting pipe are removed, and a buried hole corresponding to the outer diameter of the leading pipe is formed.

The outside diameter of the buried hole formed by the lead pipe is usually smaller than the diameter of the buried pipe, so in the next step, an enlarged diameter tube corresponding to the outside diameter of the buried pipe is pushed into the buried hole, and the diameter of the buried hole is expanded. After consolidating the surrounding wall and greatly expanding the hole diameter, the buried pipe is moved forward and buried. In some cases, a waste soil intake port is provided at the tip of the diameter expansion pipe, and the waste soil that enters the intake port as the diameter expansion pipe is propelled is discharged through a connecting pipe connected to the diameter expansion pipe. In any of the above methods, in order to propel the buried pipes into the buried hole, thrust is applied by pushing the tail end of the buried pipes that are successively added using a push jack in the starting shaft.

A specific example of such a consolidation type propulsion burial method is disclosed in, for example, US Pat. No. 4,024,721.

[Problem to be solved by the invention]

In the conventional method described above, the process of shaping the buried hole using the guide pipe and the process of pushing and burying the buried pipe were performed in separate processes. In particular, in order to construct a buried pipe larger than the outer diameter of the leading pipe, the process of forming the buried hole using the leading pipe and the process of enlarging the buried hole using the expanding pipe are separated.

In this way, if the process of shaping the buried hole using the lead pipe, the process of enlarging the buried hole using the diameter-expanding pipe, and the process of pushing and burying the buried pipe are performed in separate processes, the work process becomes extremely complicated, and the work becomes difficult. Since the efficiency is low, there are problems in that the construction time is long and the construction cost is high.

In addition, in the conventional method, when a large number of buried pipes are added and the total length of the buried pipes that are propelled at the same time becomes long, the frictional resistance of the ground that is applied to the buried pipes becomes extremely large, and a thrust force that exceeds this frictional resistance is applied to the buried pipes. Therefore, it is necessary to apply a large force with the main push jack, and as a result, there is a problem in that extremely high stress is generated at the end of the buried pipe pushed by the main push jack, causing deformation or damage. Ta.

As described above, buried pipes used in the consolidation type propulsion burial method are often made of thin-walled pipes with relatively small diameters or soft materials, and therefore are unable to withstand large axial compressive stress. In addition, since the buried hole is formed by compacting the ground, the pressure of the ground trying to return to its original state is applied to the buried pipe, creating an extra frictional resistance, and the buried pipe cannot be propelled unless a large thrust is applied. , there is a problem in that even greater stress occurs at the tail end of the buried pipe.

In particular, in the process of forming a burial hole using a lead pipe, the receiving cylinder encounters a large amount of resistance when it penetrates into the ground, and it is necessary to support the lead pipe from behind so that it does not move back due to the resistance of the ground. If an attempt is made to support the leading pipe by applying thrust to the tail end of the buried pipe connected to the rear of the lead pipe using a push jack, an excessive load will be applied to the tail end of the buried pipe. In order to avoid this, it is necessary to separate the process of forming the buried hole using the lead pipe and the process of pushing and burying the buried pipe into separate processes. In addition, a process of forming a buried hole using a lead pipe,
If the process of enlarging the buried hole using the expanded diameter pipe and furthermore the process of pushing and burying the buried pipe are attempted to be carried out simultaneously and consecutively, it is necessary to apply even greater thrust to the tail end of the buried pipe, which reduces the durability of the buried pipe. In some cases, it was impractical.

Due to these problems, in the conventional consolidation type propulsion burying method, in order to prevent the buried pipe from deforming or breaking, only an extremely short distance of the buried pipe can be buried in one process, and the short distance propulsion burying process is difficult. Repeating this process over and over again reduces work efficiency and increases installation costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for simplifying the work process and improving construction efficiency in the consolidation type propulsion burial method as described above. Another objective is to provide a method that prevents localized high stress from occurring in buried pipes, prevents deformation and damage of buried pipes, and enables continuous long-distance buried construction. It is in.

[Means to solve the problem]

To solve the above-mentioned problems, the method of propulsion and burying of a buried pipe according to claim 1 of the present invention provides an extensible penetration cylinder that penetrates into the ground to compact the ground and form a burial hole. At the same time, connect the first connecting shaft to the leading body with a In contrast, the connecting shafts are connected one after another and extended, and the buried pipe is buried while the guide body, the connecting shaft, and the buried pipe are propelled.

The invention according to claim 2 is the method according to claim 1, comprising:
The guide body is provided with an expanded diameter tube having a larger outer diameter than the penetration cylinder, and the buried hole formed by the penetration cylinder is expanded by compacting the ground as the diameter expansion tube is propelled.

The invention according to claim 3 is the method according to claim 1 or 2, in which the shape and structure of the leading body and the penetrating cylinder that propel the buried pipe by applying thrust or traction force to a plurality of locations in the connected buried pipe row are as follows. Basically, it is almost the same as that used in conventional propulsion burial methods.

The penetrating cylinder used is one operated by a pressure medium such as oil or air, or by electromagnetic force. The penetration cylinder is
Although the guide body expands and contracts in a straight line with respect to the central axis of the guide body, a swinging mechanism may be provided at the tip of the penetrating cylinder or the leading body so that the penetrating cylinder can be extended in any direction. With this swing mechanism, the burial direction can be freely adjusted when carrying out long-distance propulsion burial work.

``A connecting shaft body is connected to the rear end of the leading body, and the connecting shaft bodies are connected one after another. A pressure pipe and a power cable for operating the penetration cylinder of the guide body are passed through the interior of the connecting shaft body. The leading body can be propelled by pushing the rear end of this connecting shaft with a pilot jack installed in the shaft.

The buried pipe is connected by inserting the connecting shaft connected to the rear end of the leading body, but it is also possible to directly insert the buried pipe into the connecting shaft connected to the trailing end of the leading body. An expanded diameter tube may be connected to the rear end of the body, and a buried tube may be connected to the rear end of the expanded diameter tube. A buried pipe is connected directly to the rear end of the leading body when the outside diameter of the leading body is approximately the same as the outside diameter of the buried pipe.
If the outer diameter of the guide body is smaller than the outer diameter of the buried pipe, it is necessary to use an enlarged diameter pipe.

The diameter-expanding tube has a tapered conical part at the connection part to the guide body, and can expand the inner diameter of the buried hole by compacting the ground with the conical part. The rear end of the expanded diameter tube is set to be slightly larger than the outer diameter of the buried tube.

Depending on the construction conditions, it is also possible to provide an intake port in the conical part of the expanded diameter pipe to take in earth and sand from a part of the ground. By providing an intake port, it is possible to reduce the resistance of the ground during propulsion and the amount of ground consolidation, which can increase the propulsion speed of the guide body and expanded diameter pipe, and reduce the outer diameter of the guide body and the buried pipe. This is effective when the difference in the outer diameter of the ground is large and the amount of consolidation of the ground becomes too large. The waste soil taken into the expanded diameter pipe from the intake port is discharged through a conveying means such as a screw conveyor installed inside the above-mentioned connecting shaft.

Moreover, it is also possible to wash away the above-mentioned soil with high-pressure water and discharge it.

The following methods can be used to apply propulsive force to propel the buried pipe.

First, a thrust jack installed in the shaft can be used to apply thrust to the end of the buried pipe row, or the leading end of the buried pipe row can be fixed to the leading body, and the thrust can be applied to the end of the connecting shaft. With the thrust force, a traction force is applied to the buried incense via the guide body,
This is a method of promoting buried pipes. The above method is a method of applying a propulsive force to one point at the leading end or the tail end of a connected buried pipe array. Also, by using the above two methods together,
It is also possible to adopt a method of applying propulsive force to two locations, the leading edge and the tail end of the buried pipe. Furthermore, if the buried pipes can be held and fixed to the connecting shaft inserted inside, any number of locations in the buried pipe row can be held and fixed to the connecting shaft, and the buried pipes can be held and fixed at multiple locations from the connecting shaft to the Propulsive force can be added to a certain point.

A mechanical fixing mechanism can be used as a means for holding and fixing the buried pipe to the connecting shaft inserted therein. Further, as another fixing means, the connecting shaft body is provided with an expansion mechanism including an elastically inflatable expansion bag body, and a pressure medium such as air, water, or oil is supplied to the expansion bag body. It is also possible to adopt a method in which the expansion bag is inflated and the inner wall of the buried pipe is pressed, and the buried pipe is held and fixed to the connecting shaft by the frictional holding force generated between the inner wall of the buried pipe and the expansion bag.

[For production]

According to the invention set forth in claim 1, while consolidating the ground with the guide body equipped with the penetration cylinder and forming the burial hole,
Since the buried pipe is inserted into the outer periphery of the connecting shaft connected to the rear of the leading body and the pipes are successively added, the advancing and burying of the buried pipe is completed at the same time as the leading body is propelled. That is, in the conventional method, the process of forming the buried hole using the guide body and the process of burying the buried pipe were performed in separate processes, but in this invention, in order to perform both processes continuously, The work process is simplified and construction time is shortened.

According to the invention as claimed in claim 2, by providing the guide body with the diameter-expanding tube, the step of shaping the buried hole by the penetration cylinder of the guide body, and the step of enlarging the buried hole with the diameter-expanding tube.
Furthermore, the entire process up to the process of pushing and burying the buried pipe can be performed continuously and simultaneously, further simplifying the work process.

The operation of the invention according to claim 3 is as follows. In order to push and bury the buried pipe behind the guide body, it is necessary to apply a driving force to propel the buried pipe against the frictional resistance of the ground, but this driving force can be distributed to multiple locations on the buried pipe. By adding this amount, it is possible to alleviate the concentration of stress that occurs in the buried pipe. For example, if the propulsive force is applied to the leading edge and the last fixed point of the buried pipe row, the maximum stress generated in the buried pipe will be reduced by half compared to when the propulsive force is applied only to the last part. . Furthermore, if the buried pipes are held and fixed to the connecting shaft at a plurality of locations along the buried pipe row, the maximum stress generated in the buried pipes is further reduced.

〔Example〕

Next, embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a method for advancing and burying a buried pipe step by step, and the overall structure will be explained with reference to FIG. 1 (al).

A vertical shaft V is excavated in the ground iE, and a buried pipe 3 is buried horizontally from the side of the vertical shaft V. At the tip of the burial device,
A guide body 1 with a penetrating cylinder 10 is arranged. Connecting shaft bodies 2 having an outer diameter approximately equal to the outer diameter of the guide body 1 are successively added to the rear of the guide body 1. Connecting flanges 20 are provided at the joints between the leading body 1 and the connecting shaft 2, and between the connecting shafts 2, and are connected and fixed by bolts or other means. An enlarged diameter pipe 7 is attached to the connecting shaft body 2 immediately behind the leading shaft 1.

The expanded diameter tube 7 has a conical portion 70 whose outer diameter changes in a tapered manner at its tip, and the rear of the conical portion 70 is a cylindrical portion 71 having a constant outer diameter. The tip diameter of the conical part 70 is set to be the same as the outer diameter of the leading body l and the connecting shaft body 2, and the outer diameter of the rear end of the conical part 70 and the cylindrical part 71 is slightly larger than the outer diameter of the buried pipe 3. It is set to about. A fitting part 72 into which the buried pipe 3 is fitted is provided at the rear end of the cylindrical part 71.

An expansion mechanism 4 is provided in a part of the spliced connecting shaft 2, and by supplying a pressure medium to the expansion mechanism 4 and pressing the expansion mechanism 4 against the inner wall surface of the buried pipe 3, the buried pipe 3 is expanded. 3 can be held and fixed to the connecting shaft body 2.

A thrust force is applied to the last connecting shaft 2 in the horizontal direction from a main pushing jack (not shown) installed in the shaft V, and this thrust causes the connecting shaft 2 to move from the leading body 1. The entire structure is propelled into ground E.

Next, FIGS. 2 to 4 show the detailed structure of the expansion mechanism 4. The connecting shaft body 2 has a cylindrical shape as a whole, and a pressure pipe, a power cable, etc. for operating the guide body l pass through the inside thereof. Connecting flange portions 20.20 for connecting the connecting shafts 2 to each other are provided at the front and rear ends of the connecting shaft 2. A plurality of expansion mechanisms 4 are provided at intervals in the circumferential direction on the outer circumferential surface over substantially the entire axial length of the connecting shaft body 2 . A guide member 22 is provided outside the expansion mechanism and close to both ends of the connecting shaft body 2, and is fixed so as to protrude from the outer circumferential surface. The outer peripheral surface of the guide member 22 has an arcuate curved shape that roughly follows the inner wall surface of the buried pipe 3, and when inserting the connecting shaft body 2 into the buried pipe 3, the guide member 22 is attached to the inner wall surface of the buried pipe 3. By sliding the connecting shaft 2 along the connecting shaft 2, the connecting shaft 2 can be inserted and guided smoothly.

The expansion mechanism 4 has a plurality of struts 41 radially protruding from the outer periphery of the connecting shaft body 2 installed along the axial direction, a receiving plate portion 42 is attached to the upper end of the strut 4l, and a rubber plate is attached to the upper surface of the plate portion 42. An inflatable bag body 40 made of an elastic material such as the like is attached.

The expansion bag body 40 has an elongated flat shape along the axial direction of the connecting shaft body 2, and both ends of the expansion bag body 40 are sandwiched and sealed between clamping plates 45 and fixed to the receiving plate part 42. , valves 43 are attached to both ends. this harp 4
When a pressure medium such as air, water, or oil is supplied into the expansion bag 40 from the inside of the expansion bag 40, the expansion bag 40 expands toward the outer circumference. When no pressure medium is supplied to the inflation bag 40, the outer diameter of the inflation bag 40 is smaller than the inner diameter of the buried pipe 3 and also smaller than the outer diameter of the guide member 22. When the pressure medium is supplied and the expansion bag 40 expands in the outer circumferential direction, the outer diameter of the expansion bag 40 becomes larger than the outside diameter of the guide member 22 and presses against the inner wall surface of the buried pipe 3. It has become.

To supply pressure medium to the expansion bag body 40, the pressure medium pipe 5 is connected to the valve 43, and the pressure medium is supplied to the pressure medium pipe 5 from a pressure medium source (not shown) installed inside the shaft V or on the ground surface. supply

As shown in FIG. 4, when a plurality of connecting shafts 2 are connected, the valves 43 of the front and rear expansion bags 40 are connected in order through the pressure medium piping 5, and the entire row of connecting shafts 2 is connected. , inflate all the axially connected inflatable bags 40 at the same time, or release the pressure after the construction is completed and inflate the inflatable bags 4.
It is now possible to shrink 0.

In the illustrated embodiment, six along the circumferential direction of the connecting shaft body 2
Although the number of expansion bags 40 is installed, the number of expansion bags 40 installed can be changed arbitrarily. The larger the number of expansion bags 40 installed in the circumferential direction of the connecting shaft body 2, the more the buried pipe 3 can be pressed evenly over the entire circumference and securely held and fixed.
As the number of parts increases, the number of parts also increases, making manufacturing and handling time-consuming.

The expansion bags 40 are arranged almost evenly in the circumferential direction of the connecting shaft 2, but as shown in FIG. The expansion bag 40 is not provided in the optical path portion for irradiating the collimated target 6 with the laser beam. In addition, the expansion bag 40 is not provided at the symmetrical position of the collimation target 6, but this is in order to balance the expansion pressure in the radial direction and to pass various wiring and piping to the guide body 1. It is made available for use.

In order to hold and fix the buried pipe 3 to the connecting shaft 2, the inflation pressing force applied from the expansion bag 40 to the buried pipe 3 is determined by the setting of the outer diameter of the expansion bag 40 relative to the inner diameter of the buried pipe 3, and the expansion pressure applied to the buried pipe 3 by the expansion bag 40. It can be adjusted by the supply pressure of the pressure medium supplied to the body 40.

Since the diameter of the buried pipe 3 to be buried varies, the outer diameter of the expansion bag body 40 installed on the connecting shaft body 2 is also designed according to the inner diameter of the buried pipe 3. This difference can also be absorbed by adjusting the supply pressure of the pressure medium.

Furthermore, when changing the outer diameter of the expansion bag 40 to match the inside diameter of the buried pipe 3, the shape and dimensions of the expansion bag 40 itself may be changed;
This can also be done by changing the length of 1. If the strut 41 is made to have a radially expandable structure, one type of connecting shaft body 2 and expansion mechanism 4 can be made to correspond to a plurality of types of buried pipes 3 having different inner diameters.

The outer circumferential surface of the expansion bag body 40 is formed with fine irregularities to increase the coefficient of friction in order to enhance the holding and fixing force of the buried pipe 3, and a reinforcing member is pasted to reinforce the outer circumferential surface. You can also leave it as is.

Regarding the propulsion burial method using the above-mentioned device, the first
The explanation will be centered on the figures.

The buried pipe 3 is held and fixed to the connecting shaft body 2 before being propelled and buried in the ground E. To hold and fix the buried pipe 3 to the connecting shaft 2, first, the connecting shaft 2 is inserted into the buried pipe 3 while the expansion bag 40 of the connecting shaft 2 is deflated. At this time, the guide member 22 of the connecting shaft 2 comes into contact with the inner wall surface of the buried pipe 3 and slides, so that it can be inserted smoothly. After the buried pipe 3 is completely inserted into the outer periphery of the connecting shaft body 2,
The pressure medium piping 5 is connected to the expansion bag body 40, and the expansion bag body 4
When the tube 0 is inflated, the expansion bag body 40 presses the inner wall surface of the buried tube 3, and the buried tube 3 is held and fixed to the connecting shaft body 2. In this state, if the buried pipe 3 is advanced into the buried hole together with the connecting shaft 2, the buried pipe 3 will resist the frictional resistance of the ground E.
will be propelled and buried in the burial hole. When adding buried pipes 3 and connection shafts 2, the valves 4 of each expansion bag 40 are successively connected to each other with pressure medium piping 5. A specific example of the set pressure of the pressure medium supplied to the expansion bag 40. , a pressure medium of about 7.0 kg/crA is supplied to the expansion bag body 40 by a pressure supply source, and the internal pressure of the expansion bag body 4o is 2.0 kg/crA under normal use. 5 kg/c (1, maximum 5.0 kg
/ cm! When used under conditions of 7. It will be about 45 tons.

Figure 1 (al) shows a state in which the buried pipe 3 is held and fixed to the connecting shaft 2 and a part of the buried pipe 3 is buried. From this state, as shown in Figure 1 (b), , the penetration cylinder 10 of the leading body 1 is extended forward. After the penetration cylinder 10 has been extended to a predetermined length, as shown in FIG. The guide body 1, the buried pipe 3, etc. are moved toward the penetration cylinder 10 by the thrust applied from the main push jack.

That is, the penetration cylinder 10 itself does not move, and the guide body 1
The entire subsequent section will move forward. At this time, the resistance force applied to the leading body 1 and the expanded diameter pipe 7 is enough to push away and compact the ground outside the outer diameter of the penetration cylinder 10, so the thrust force applied from the main pusher is relatively small. It turns out that it's okay. Since the buried pipe 3 is covered with the enlarged diameter pipe 7 at the front, the only resistance force applied to the buried pipe 3 is the frictional resistance force between the outer surface of the buried pipe 3 and the ground E. This one
The 9 tM resistance force can be sufficiently countered by the holding and fixing force by the expansion mechanism 4 alone.

Due to the expansion and contraction operation of the penetration cylinder 10 as described above, the portion behind the guide body flu is made to be fffliM in stages. When the buried hole reaches the target shaft V and the buried pipe 3 is buried throughout the buried hole, the expansion bag 40 of the connecting shaft body 2
The burying of the buried pipe 3 is completed by releasing the pressure, releasing the holding and fixing of the buried pipe 3, the expansion bag 40, and the connecting shaft 2, and removing the connecting shaft 2 from the buried hole.

Next, in the embodiment shown in FIG. 5, the outer periphery of the inflatable bag body 40 is covered with a coating member 47 for transmitting frictional force. The covering member 47 is made of a rubber material with excellent strength and wear resistance, and both ends of the covering member 47 are fixed to a receiving plate portion 42 and a tightening plate 45 fixed to the connecting shaft body 2. The covering member 47 and the inflatable bag body 40 are not directly fixed. The inflatable bag body 40 shown on the lower side of FIG. 5 is in a non-inflated state;
The inflatable bag body 40 is deflated and becomes flat. In this state, no frictional holding force acts between the covering member 47 and the inner wall surface of the buried pipe 3, and the buried pipe 3 can freely move in the axial direction. As shown in the upper side of FIG. 5, when the expansion bag 40 expands in the outer circumferential direction, the expansion bag 40 presses against the inner wall surface of the buried pipe 3 via the covering member 47. The axial frictional resistance force applied from the buried pipe 3 is transmitted from the tightening plate 45 to the connecting shaft body 2 via the covering member 47, so that the expansion bag body 4
0, no axial force is applied. The outer surface of the covering member 47 may have irregularities or the like in order to increase the friction retention force.

According to the above embodiment, the expansion bag body 40 only needs to be able to apply a pressing force in the radial direction to the buried pipe 3, and is not required to have much strength, so it is possible to use a material with excellent elasticity or a relatively thin material. becomes possible. Further, by protecting the expansion bag 40 with the covering member 47 having excellent strength, it is possible to prevent the expansion bag 40 from being damaged during handling of the connecting shaft 2 or the like. In particular, since the covering member 47 comes into contact with the inner wall surface of the buried tube 3, there is no fear that the expansion bag 40 and the buried tube 3 will come into contact with each other and damage the expansion bag 40 during the insertion work of the buried tube 3.

Next, the embodiment shown in FIG. 6 is a case in which a propulsive force is applied to the leading and trailing ends of the buried pipe array.

In this embodiment, an enlarged diameter tube 7 is provided in the middle of the guide body 1. If the expanded diameter tube 7 is integrated with the guide body 1 in this way, the overall length can be shortened. Further, the fitting portion 72 at the rear end of the enlarged diameter tube 7 is tightly fitted to the buried tube 3, so that the buried tube 3 can be tightly fixed to the enlarged diameter tube 7. In addition, if a fastening mechanism for fixing the buried pipe 3 to the enlarged diameter pipe 7 is provided, it can be fixed more reliably. The buried pipes 3 are also securely fixed to each other using collars 30 or the like.

To explain the construction process, first, the connecting shaft 2 is connected and fixed to the rear of the guide body 1, and the buried pipe 3 is connected and fixed to the rear of the expanded diameter pipe 7, and the connecting shaft 2 and the buried pipe 3 are connected in sequence. I will do it. And 1 of the connecting shaft body 2! l. The connecting shaft body 2, the leading body 3, and the enlarged diameter tube 7 are propelled by applying a thrust force to the end using a pusher or the like. Thrust is also applied to the rear end of the buried pipe 3 using a push jack or the like. Then, a thrust force is applied to the rear end of the buried pipe 3, and at the same time, a traction force is applied to the distal end connected and fixed to the enlarged diameter pipe 7 due to the propulsion of the enlarged diameter pipe 7. In other words, propulsive force is applied to the buried pipe 3 at two locations: a traction force at the leading edge and a thrust force at the rear end.

According to this embodiment, the construction can be carried out using a normal base shovel or the like, so that the construction equipment and equipment can be simplified. Furthermore, compared to the conventional method of applying thrust only to the tail end of the buried pipe array or applying traction force only to the leading edge of the buried pipe array, the maximum stress generated in the buried pipe can be halved.

〔Effect of the invention〕

Of the method for promoting and burying a buried pipe according to the present invention as described above, according to the invention of claim 1, the process of shaping the buried hole using the guide body and the process of promoting and burying the buried pipe are continuous. Since both are performed at the same time, the work process is simplified and the overall construction efficiency is greatly improved, resulting in a significant reduction in construction costs.

According to the invention set forth in claim 2, the process of shaping the buried hole using the guide body, the process of enlarging the buried hole using the diameter-expanding pipe, and the process of pushing and burying the buried pipe are all performed simultaneously and continuously. The work process is further simplified compared to the invention as claimed in claim 1, and construction efficiency can be improved and construction costs can be reduced.

According to the invention as claimed in claim 3, by distributing the propulsive force applied to the buried pipe to a plurality of locations, the maximum stress generated in the buried pipe is reduced and stress concentration is alleviated, thereby preventing damage to the buried pipe. Deformation becomes less likely to occur. As a result, even small-diameter soft pipes can be constructed continuously over long distances using the consolidation method. In other words, even with the consolidation type propulsion burying method, where conventional methods were only able to carry out propulsion burial over short distances due to the excessive load on the buried pipe,
Enables long-distance propulsion burial construction. In addition, even if the buried pipe has poor strength, such as a small-diameter thin-walled pipe or a soft pipe, the method according to the present invention can suppress the stress generated in the buried pipe, so that the ground can be consolidated. This makes it possible to carry out long-distance propulsion burial construction by using these buried pipes, which have inferior strength, in the construction method of shaping the burial hole using

[Brief explanation of drawings]

Fig. 1 is a sectional view showing step by step the working process of an embodiment of the present invention, Fig. 2 is a detailed structural diagram of the connecting shaft, Fig. 3 is a vertical sectional view, and Fig. 4 is a structural diagram in use. , FIG. 5 is a structural diagram of a connecting shaft body showing another embodiment, and FIG. 6 is a construction sectional view showing another embodiment. 1... Leading body 10... Penetrating cylinder 2... Connection shaft body 3... Buried pipe 4... Expanding rock structure 40...
- Expansion bag body 43... Valve 50... Pressure medium piping 7... Expanded diameter pipe

Claims (1)

[Scope of Claims] 1. Connecting the foremost connecting shaft body to a leading body having an extensible penetrating cylinder at its tip that compacts the ground and forms a burial hole by penetrating the ground, and The first buried pipe is inserted into the outer periphery of the connecting shaft body, and the buried pipe is connected to the buried pipe, and the connecting shaft body is connected to the connecting shaft body one after another, respectively, and extended. A buried pipe propulsion burying method in which the buried pipe is buried while propelling the shaft body and the buried pipe. 2. Claim 1, wherein the guide body is provided with an expanded diameter pipe having a larger outer diameter than the penetration cylinder, and the buried hole formed by the penetration cylinder is expanded by consolidating the ground as the diameter expansion pipe advances. The described promotion burial method. 3. The method for promoting and burying a buried pipe according to claim 1 or 2, wherein the buried pipe is propelled by applying thrust or traction force to a plurality of locations in the connected buried pipe array.