JPH02144498A - Driving and burying method of buried pipe and device therefor - Google Patents

Abstract

PURPOSE:To make it possible to carry out a long-distance of burying execution continuously without making any deformation and damage of buried pipes by coming into contact with the internal wall of the buried pipes to provide retaining mechanisms holding and fixing the buried pipes from the insides of them to driving shaft bodies, and enabling the buried pipes along to give thrust with the driving forward of the driving shaft bodies. CONSTITUTION:Retaining mechanisms 4 of buried pipes 3 are provided to appropriate positions of driving shaft bodies 2, and the tips of the retaining mechanisms 4 are brought into contact with the internal wall of the buried pipes 3 to hold and fix the buried pipes 3 from the insides of them by the retaining mechanisms 4 or the driving shaft bodies 2. With the driving of the driving shaft bodies and an excavator, the thrust is given to the buried pipes to be fixed to the driving shaft bodies to drive forward. Accordingly, avoiding the ends that stress concentration is apt to generate, the stress can be reduced by applying the thrust to a midway part or by holding a plurality of places of a row of the buried pipes to disperse the thrust.

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,
This invention relates to a method for burying underground pipes such as vinyl chloride pipes in the construction of sewerage systems, etc., by drilling holes in the ground and advancing the pipes one by one into the holes.

[Conventional technology]

The method for constructing underground pipes is to use a drilling device equipped with an auger or other excavation mechanism at the tip to excavate a hole underground.
There is a method of advancing and burying a buried pipe following the excavation of an excavation rig, which is called the so-called auger method or propulsion method.

On the other hand, as materials for underground pipes, soft underground pipes such as vinyl chloride pipes, which are lightweight and have low manufacturing costs, are being used instead of the conventionally used steel pipes and humid pipes. Adoption of the above-mentioned propulsion method is also being considered for the burial construction of soft underground pipes.

Figure 7 schematically shows the conventional propulsion method using soft buried pipes, in which a vertical hole ■ is excavated in the ground E, and a buried hole H is excavated horizontally from this vertical hole V. In order to excavate the buried hole H, the ground 1liE is excavated using an excavating device 1 equipped with an excavating mechanism 10 such as a rotationally driven auger at the tip. A drive shaft body 2 housing an auger screw 11 for supplying rotational driving force to the excavation mechanism 10 and discharging excavated soil is connected to the rear of the excavation device 1. By applying a forward thrust to the excavator 2, the excavator 1 connected to the front of the drive shaft body 2 is propelled to excavate the buried hole H. The drive shaft body 2 has a vertical hole■
Since it is necessary to insert it into the buried hole (1) through the shaft, the excavating device (1) is pushed forward while sequentially adding drive shaft bodies (2) of a fixed length that match the dimensions of the vertical hole (V). In order to propel the excavation device 1 and the drive shaft body 2, a thrust force is applied to the rearmost drive shaft body 2 in the pit V using a hydraulic jack (not shown) or the like.

In this way, at the same time as digging the buried hole H,
The buried pipe 3 is inserted into the outer periphery of the drive shaft body 2, and the buried pipe 3 is propelled into the buried hole H.

Similarly to the drive shaft body 2, the buried pipes 3 are formed to a fixed length and are successively added. In order to propel the buried pipes 3 forward against the frictional resistance of the ground E, the same means as for propelling the drive shaft body 2 is used, and from the end of the row of buried pipes 3, vertical holes
Thrust is applied using a hydraulic jack installed inside.

[Problem to be solved by the invention]

However, when the number of underground pipes 3 is increased and the total length of the underground pipes 3 becomes longer, the distance between the underground pipes 3 and the ground E becomes longer.
Since the frictional resistance between the two ends increases, it is necessary to increase the thrust force applied to the last buried pipe 3, and the stress generated in the buried pipe 3 due to this thrust also increases. However, in the case of a soft buried pipe 3, it does not have the strength of a steel pipe or a humid pipe, so there is a problem that deformation or breakage occurs at a place where high stress is generated, such as the tail end of the buried pipe 3.

In order to solve the above problems, instead of applying thrust to the tail end of the buried pipe 3, the leading end of the buried pipe 3 is fixed to the excavation rig 1, and as the excavation rig l is propelled, the buried pipe 3 is
A method of towing the buried pipe 3 has also been considered, but even with this method, the traction force is applied only to the leading edge of the buried pipe 3, which generates large stress at the leading edge, resulting in deformation and breakage. In other words, in either method, the thrust (or traction force) is applied not only to the last or the most advanced point, but also to the entire buried pipe 3 ahead or behind it, which reduces the friction of the ground E. All the resistance acts concentratedly at the point where the thrust is applied, and a large stress is generated there, causing deformation and fracture 11.

Therefore, it is impossible to bury soft 1.1 pipes over long distances using the conventional I. It had the drawbacks of low efficiency and high construction costs. Mazoko, problems like L are not limited to buried pipes 3 made of soft materials, but also when using thin-walled pipes or increasing the diameter of the pipes, even with steel pipes or injected pipes, where the propulsion force increases. In other words, if the wall thickness is thin compared to the diameter, the end portions are likely to be damaged or deformed, causing the same problem as described above.

Therefore, an object of the present invention is to prevent the buried pipe from being deformed or damaged due to localized high stress occurring in the two buried pipes in the method for promoting and burying the buried pipe as described above.
The purpose of this invention is to provide a method and apparatus that enable continuous long-distance burial work.

[Step -f to solve the problem] 6. To solve the above problem, the method according to claim 1 provides a first drive for an excavation device for excavating a buried hole for a buried pipe. While connecting the shaft bodies, 1. Insert the first buried pipe to the outer periphery of the drive shaft body, connect the buried pipe to the buried pipe W, and connect the drive shaft body in line with the drive shaft body to connect the subsequent buried pipe. The L! 1! In the method of burying the buried pipe by connecting the installed pipe and the drive shaft body one after another and extending each one, and applying thrust to the drive shaft body to dig the buried hole and bury the buried pipe, the inner wall surface of the buried pipe is The drive shaft body is provided with a holding mechanism that abuts and holds and fixes the buried pipe from the inside, so that thrust is also applied to the buried pipe as the drive shaft body is propelled.

The device according to claim 2 includes a drilling device for excavating a buried hole for a buried pipe, and a drive shaft body that is sequentially connected to the drilling device toward the rear and drives the drilling device and transmits forward propulsive force to the drilling device. In a buried pipe propulsion burying device that sequentially buries buried pipes while inserting the buried pipes around the outer periphery of a drive shaft body, a holding mechanism holds and fixes the buried pipe from the inside by abutting against the inner surface of the buried pipe. is provided on the drive shaft body.

[For production]

When adding buried pipes one after another and pushing them into the buried hole, the total length of the buried pipe row that connects a large number of buried pipes is
If a suitable point along the way is held and fixed from the inside to the drive shaft body using a holding mechanism that contacts the inner wall surface of the buried pipe, it will be possible to securely hold and fix it to the drive shaft body from the inside using a holding mechanism that comes into contact with the inner wall surface of the buried pipe. No large stress is generated on the surface. This is because the thrust force on the buried pipe acts in the middle of the buried pipe row, so the stress generated at the holding point where the thrust is applied is only the friction and resistance that is applied to the buried pipe ahead or behind it.
The frictional resistance of the entire buried pipe array is much smaller than the conventional method in which the stress acts as a bundle in one place. The holding mechanism is designed to hold the buried pipe by coming into contact with the inner wall surface of the buried pipe, so it can hold any part in the middle of the buried pipe row, and can hold multiple parts of one buried pipe. This makes it possible to reduce the frictional resistance, or thrust, borne by a single holding location, thereby making it possible to minimize the stress generated at each holding location.

〔Example〕

The method and apparatus of the present invention will now be described in detail with reference to the drawings showing examples. The basic structure of the excavation equipment and buried pipe is the same as that of the conventional method described above, so common parts are given the same reference numerals and duplicate explanations are omitted. Figure 1 shows the buried pipe 3. This diagram schematically shows the buried condition. First, a hole V is dug in the ground,
A burial hole H is excavated in the horizontal direction from the middle of this vertical hole (■). To excavate the horizontal buried hole I], use an excavator such as an auger f! 10 is driven by the drive shaft body 2 connected to the rear! 7, which is exactly the same as the conventional method.

In the method according to the present invention, a holding mechanism 4 for the 3J pipe 3 is provided at an appropriate location on the drive shaft body 2, and this holding mechanism 4
The distal end thereof is brought into contact with the inner wall surface of the buried pipe 3, and the buried pipe 3 is held and fixed from the inside by a holding mechanism 4, that is, a drive shaft body 2.

Figures 2 and 3 show the detailed structure of the drive shaft body 2 and the holding mechanism 4. The drive shaft body 2 has a cylindrical shape as a whole, and has a normal auger screw and excavated earth inside. A discharge channel (see Figure 1), etc. is provided, and
...1 A connecting flange portion 20° 20 for connecting the drive shaft bodies 2 to each other is provided at the rear end. A plurality of holding mechanisms 4 are provided at intervals on the outer peripheral surface of the drive shaft body 2 in the manual direction. Guide members 22 are also provided near both ends of the drive shaft body 2, and are fixed so as to protrude from the outer peripheral surface. This guide member 22 is
When inserting the buried pipe 3 into the drive shaft body 2,
By allowing the drive shaft body 2 to slide along the inner wall surface of the drive shaft body 2, the drive shaft body 2 can be inserted and guided smoothly.

The holding mechanism 4 includes a contact pad 40 that contacts the inner wall surface of the buried pipe 3, and a contact pad 40 that moves in the radial direction.
It consists of a moving mechanism for pressing against the buried pipe 3, and in the illustrated embodiment, as a moving mechanism for the abutting pad 40, the abutting pad 40 and the drive shaft body 2 are connected by a link 41, and the abutting pad 40 and the driving shaft body 2 are connected by a link 41. Different positions of the shaft body 2 are connected by a telescopic cylinder mechanism 42. Therefore, the link 41 and the cylinder mechanism 42 constitute a triangular link machine side whose apex is the connection point to the contact pad 40. A piping 43 for supplying a working medium such as air pressure is connected to the cylinder mechanism 42, and this piping 43 extends to the rear side of the drive shaft body 2 and is connected to an external pressure source (not shown). ing.

To explain the operation of the holding mechanism 4, in the state shown in FIG. 2(a), the cylinder mechanism 42 is contracted and the contact pad 40 is
is separated from the inner wall of the buried pipe 3. Then, as shown in FIG. 2(b), when the cylinder mechanism 42 is extended, the triangular link mechanism composed of the link 41 is deformed, and the abutment pad 40 moves radially outward, causing the abutment pad 40 to move outward in the radial direction. The contact pad 40 contacts the inner wall surface of the buried pipe 3. In this state, if the pressing force of the cylinder mechanism 42 is increased, the contact pad 40 is strongly pressed against the inner wall surface of the buried pipe 3, and the buried pipe 3 is held and fixed to the holding mechanism 4 and the drive shaft body 2. The larger the pressing force of the cylinder mechanism 42 is, the more the buried pipe 3
The holding force for

That is, in this embodiment, the buried pipe 3 and the contact pad 40
The two are held and fixed by the frictional force between their pressing surfaces.

As a means for pressing the contact pad 40 against the inner wall surface of the buried pipe 3, the pneumatic cylinder of the cylinder mechanism 42 may be replaced with a hydraulic cylinder or an electromagnetic cylinder. With this method of using a pressure medium or an electrical actuation mechanism, even if the overall length changes by adding the drive shaft body 2 or buried pipe 3, it can be operated without any problems by simply extending the piping or electric cable. This is the preferred method. In addition to the mechanism shown in the figure, if the contact pad 40 can be moved in the radial direction and pressed against the inner wall surface of the buried pipe 3, various types of links, cam mechanisms, spring mechanisms, etc. used in ordinary mechanical structures can be used. Can be configured in combination. For example, if the cylinder mechanism 42 described above is installed so as to extend and contract vertically in the radial direction from the drive shaft body 2, and the contact pad 40 is directly attached to the tip of this cylinder mechanism 42, the link 41
Even without this, the abutment pad 40 can be directly moved in the radial direction by expanding and contracting the cylinder mechanism 42.

The contact surface of the contact pad 40 with respect to the buried pipe 3 is
It is preferable that the contact pad 40 is in close contact with the contact pad 40 and exerts as large a frictional holding force as possible.For example, as shown in FIG. If an elastic pad 44 configured to be deformable is attached, it can be tightly attached to the inner wall surface of the buried pipe 3, and the frictional holding force can be increased. Since the elastic pad 44 can be freely deformed according to the curvature of the inner diameter even if the inner diameter of the buried pipe 3 is slightly changed, it is also effective when used for buried pipes 3 of different diameters. The elastic pad 44 may be a bag-shaped one containing a liquid, or a solid block-shaped one made of a rubber plate or the like with excellent elasticity. In addition, in the above embodiment, the frictional holding force can be increased by forming unevenness, notches, etc. on the surface of the contact pad 40, and the buried pipe 3 is held and fixed by the frictional holding force due to the pressing of the contact pad 40. However, in the embodiment shown in FIG. 4, a suction space 46 surrounded by a rubber seal 45 is formed on the outside of the contact pad 40, and a vacuum pipe 47 is connected to this suction space 46. By vacuum suctioning the suction space 46 with the seal 45 in contact with the inner wall surface of the buried pipe 3, the contact pad 40 is vacuum suctioned to the buried pipe 3. That is, in this embodiment, the buried pipe 3 is held and fixed by suction and holding force. In this way, when the buried pipe 3 is held by the suction holding force of the abutment pad 40, it is not necessary to press the abutment pad 40 strongly against the buried pipe 3, but only apply pressure to the extent that the suction space 46 is kept airtight. Just keep in touch.

The mounting position and the number of mounting mechanisms 4 to the drive shaft body 2 can be appropriately set depending on the diameter, length, material strength, etc. of the buried pipe 3 to be held and fixed, and are not limited to the illustrated embodiment. For example, as shown in FIG. 2, in addition to providing a plurality of holding mechanisms 4 at only one location along the length of a drive shaft body 2 of a fixed length at intervals on the circumference, A plurality of holders f14 may be provided at a plurality of locations in each direction at intervals on the circumference. When using a plurality of drive shaft bodies 2 in addition, the holding mechanism 4 may be provided in all the drive shaft bodies 2, but it is also possible to provide the holding mechanism 4 in only some of the drive shaft bodies 2. good. The number of installation locations of the holding mechanism 4 is as follows:
It may be determined by taking into consideration the holding force against and the thrust required to propel the entire buried pipe 3. The number of holding mechanisms 4 disposed on the circumference of the drive shaft body 2 at one installation location can be as long as the number of holding mechanisms 4 arranged on the circumference of the drive shaft body 2, as in the embodiment shown in FIG. It can also be implemented with five, more or less. As shown in FIG. 3, on the outer periphery of the drive shaft body 2, in areas where the target member 12 for optical surveying used for positioning of the excavation rig 1 cannot be seen, the laser beam for surveying is not obstructed. In this case, the holding mechanism 4 is not installed. Further, on the outer periphery of the drive shaft body 2, a direction correction jack (
Since piping, electric cables, etc. for driving components (not shown) are also passed through, it is necessary to avoid installation locations for these members.

The method of this invention is to bury a buried pipe 3 made of a soft material with relatively poor durability against compression, such as a synthetic resin pipe such as a hard vinyl chloride pipe or a polyethylene pipe, which is used for ordinary sewage pipes and other purposes. The most effective option for the buried pipe 3 is FRP pipe, FRP pipe with a resin concrete layer as an intermediate layer, metal pipe or fume pipe (especially compared to the diameter). It can also be applied to burying thin-walled pipes.

Since there are various standards for the diameter and dimensions of the buried pipe 3 depending on the purpose, the excavation diameter of the excavating device 1 and the length of the drive shaft body 2 are also used that match the buried pipe 3. The amount of movement in the radial direction of the holding mechanism 4 provided on the drive shaft body 2 is also set in accordance with the inner diameter of the buried pipe 3. If you make it bigger, 1
Multiple types of buried pipes 3 with different diameters with different types of holding mechanisms 4
can be made to correspond to However, if this cannot be achieved by adjusting the movement of the holding mechanism 4 alone, for example, as shown in FIG. Bye.

A method for burying the buried pipe 3 using the drive shaft body 2 and the holding mechanism 4 described above will be explained in more detail.

The point of excavating the buried hole I with the drilling rig 1 connected to the drive shaft body 2 and pushing the rear end of the drive shaft body 2 with a hydraulic jack or the like to propel the drive shaft body 2 and the excavation device 1 is different from the conventional method. However, in the case of this invention, when inserting the buried pipe 3 into the outer periphery of the drive shaft body 2 and pushing it into the buried hole I (I), the buried pipe 3 is held inside the drive shaft body 2 by the holding mechanism 4. The buried pipe 3 is fixed to the drive shaft body 2 by connecting the drive shaft body 2 and the buried pipe 3 together with the drive shaft body 2. Although it may be fixed by the holding mechanism 4 in the previous standard length state, the subsequent drive shaft body 2 may be added to the row of the preceding drive shaft body 2 in the buried hole H, or the subsequent buried pipe 3 may be After joining to the preceding row of buried pipes 3, the holding machine fj!4 may be operated to fix the buried pipes 3 to the drive shaft body 2.In addition, the drive shaft body 2 and the buried pipes 3 may be The method of connecting or joining the parts and the structure of the joined parts are carried out in the same manner as conventional methods, and therefore detailed explanations will be omitted.

In this way, the burial hole H is dug while adding drive shaft bodies 2 and buried pipes 3 of a fixed length, and the buried pipes 3 are pushed and buried. When a buried hole H of a predetermined distance is excavated and the buried pipe 3 is buried, the holding mechanism 4 of the drive shaft body 2 releases the held and fixed state of the buried pipe 3, and the drive shaft body 2 is removed together with the excavation device 1. Then, only the buried pipe 3 remains in the buried hole H, and the burying of the buried pipe is completed.

〔Effect of the invention〕

According to the buried pipe propulsion burying method and device of the present invention as described above, the buried pipe is held and fixed from the inside to the drive shaft body by the holding mechanism, and as the drive shaft body and excavation equipment are propelled. This applies thrust to the buried pipe fixed to the drive shaft to propel it forward. Therefore,
Since thrust can be transmitted to any point in the buried pipe array, there is no need to apply thrust only to one location at the end or the most tip of a large number of buried pipe arrays, as in the past.

Therefore, stress can be reduced by applying thrust to the middle of the buried pipe structure, avoiding both ends where stress concentration is likely to occur, or by holding multiple locations in the buried pipe array to disperse the thrust. It can be done. If the stress generated in the buried pipe is reduced, it is possible to reliably prevent the buried pipe from deforming or breaking due to stress during propulsion.

Therefore, according to the method of the present invention, even if a buried pipe made of a soft material with relatively low yield strength or a buried pipe whose wall thickness is thin compared to its diameter is carried out over a long distance, the buried pipe will deform. This makes it possible to perform long-distance propulsion underground construction using underground pipes, which was previously difficult, and improves the efficiency of underground construction and reduces construction costs. This will greatly contribute to its expansion and popularization.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the construction state of the embodiment according to the present invention, Fig. 2 is an enlarged structural view of the drive shaft body, Fig. 3 is a vertical sectional view of the construction state, and Fig. 4 is an enlarged view of the abutment part. Cross section, 5th
The figure is an enlarged sectional view showing another embodiment of the contact pad, FIG. 6 is a structural view of the main part showing another embodiment of the holding mechanism, and FIG. 7 is a sectional view showing the construction state of the conventional example. 1... Drilling equipment 2... Drive shaft body 3... Buried pipe 4... Holding mechanism H... Buried hole agent Patent attorney Takehiko Matsumoto No. 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. Connecting the first drive shaft body to an excavation device for excavating a hole for a buried pipe, and inserting the first buried pipe through the outer periphery of the drive shaft body, Then, the buried pipe is connected to the drive shaft body, and the subsequent buried pipes and the drive shaft body are connected one after another and extended, while applying a thrust to the drive shaft body. In the method of digging a buried hole and burying the buried pipe, the drive shaft body is provided with a holding mechanism that abuts against the inner wall surface of the buried pipe and holds and fixes the buried pipe from the inside. A method for promoting and burying a buried pipe, characterized by applying thrust to the buried pipe as the body is propelled. 2. A drilling device that excavates a buried hole for a buried pipe, and a drive shaft body that is sequentially connected to the drilling device toward the rear to drive the drilling device and transmit forward propulsion to the drilling device. In a buried pipe propulsion burying device that sequentially buries buried pipes while inserting the buried pipes around the outer periphery of the pipe, a holding mechanism is provided on the drive shaft body for holding and fixing the buried pipe from the inside by coming into contact with the inner surface of the buried pipe. A buried pipe propulsion burial device characterized by: