JPH0645516Y2 - Thrust dispersion device for small diameter pipes - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is applied to water and sewer pipes, gas pipes,
It relates to a thruster for propelling small-diameter pipes, which is used to bury electric wires and signal line storage tubes in the ground.

[0002]

2. Description of the Related Art As a thrust transmission method for propelling and burying a small-diameter buried pipe, there is a method in which the thrust is concentrated and pressed against the rear end face of the buried pipe while excavating the ground by the excavating means equipped in the leading conductor portion. It is commonly adopted. However, in recent years, there has been a growing demand for the promotion of thin-walled pipes with low axial load-bearing capacity, such as PVC pipes and reinforced plastic pipes that have excellent corrosion resistance and watertightness. In the method of applying thrust force, only a small thrust force can be applied to the buried pipe end, and it is currently used for short-distance propulsion.

Therefore, in order to propel a thin-walled pipe having a small axial load bearing capacity, an inner pipe made of steel or the like having a relatively high strength is continuously provided in the buried pipe, and the tip of the inner pipe is placed at the rear portion of the front conductor. The technology of fixing and applying the thrust of the lead conductor to the lead conductor from the rear end through the inner pipe to disperse the thrust applied to the buried pipe is disclosed in Japanese Patent Publication No. 59.
-45077.

According to this method, it is not necessary to apply the thrust of the front conductor to the buried pipe, and the rear end surface of the buried pipe need only be loaded with the thrust corresponding to the outer peripheral frictional force of the buried pipe. Enabled the promotion of.

However, also in this method, since the outer peripheral frictional force of the buried pipe is proportional to the propulsion distance, if the propulsion distance becomes long, a large thrust force is required on the rear end face of the buried pipe, and the propulsion may be impossible.

Therefore, as a device capable of propelling a thin-walled pipe over a long distance, as shown in FIG. 3, a pair of guide plates are fixed to the outer circumference of the inner pipe at the position where the buried pipe is connected, and further installed on the end face of the buried pipe. Then, a device has been developed in which the guide plate surface is slidably connected by a telescopic jack and installed. With the development of this device, the outer peripheral frictional force of the buried pipe forward from this device is transmitted through the dispersion plate as the inner pipe advances. Therefore, the thin-walled pipe can be propelled without concentrating the thrust on the rear end surface of the buried pipe.

[0007]

With the development of the device for transmitting the thrust to the buried pipe through the guide plate and the dispersion plate described above, the thrust is dispersed and loaded on the end face at an arbitrary position of the buried pipe. Propulsion is possible even with small-diameter thin-walled pipes. However, when the lead conductor is deflected during the propulsion construction, the buried pipe also gradually follows behind the lead conductor, the deflected side pipe end surface comes into contact with the buried pipe connecting portion, and the other pipe end surface is opened.
After passing through the deflected portion, the opening-side end surface of the subsequent embedded pipe tries to contact the front embedded pipe end surface, but as shown in FIG. 4, it is contacted by the guide plate and the dispersion plate fixed to the inner pipe. The contact is blocked, and thrust is concentrated only on the end surface on the deflection side for a long period of time, resulting in damage to the tube.

The present invention has been studied to solve the above-mentioned problems, and the present invention has been completed.

[0009]

According to the present invention, a tip conductor having excavation means is attached to the tip of a buried pipe, the tip conductor is connected to an inner tube installed in the buried pipe, and the ground is excavated by the excavation means of the lead conductor. In addition, in the thrust device of a small diameter pipe that disperses and presses the inner pipe and the rear end surface of the embedded pipe to propel the front conductor and the embedded pipe, an annular spherical seat is fixed to the outer pipe outer periphery of the arbitrary embedded pipe connection point. On the outer spherical surface, a pair of dispersion plates equipped with a connection plate that can tilt in the propulsion direction are installed so as to abut the end surface of the embedded pipe, and are connected to the pair of dispersion plates to be movable. (EN) Provided is a thrust dispersing device for a small-diameter pipe provided with a plurality of telescopic jacks.

As the dispersion plate, in order to effectively transmit the thrust force from the inner pipe to the end face of the buried pipe, a relatively strong copper material or the like is used so as not to be deformed. In addition, at the completion of the propulsion of the buried pipe, in order to reduce the expansion jack and remove the dispersion plate from the end face of the buried pipe into the pipe, the separation plate can be moved inward. Are connected by.

[0011]

[Operation] The connecting plate equipped with the spherical seat on the outer circumference of the inner pipe on the dispersion plate is capable of tilting in the propulsion direction, and the dispersion plate automatically moves even when the buried pipe in front is deflected. And tilts to contact the end face of the front buried pipe. For this reason, the thrust to the buried pipe transmitted via the inner pipe is sufficient even and small thrust, and it is possible to safely and reliably propel a thin-walled pipe having a small diameter without damage to the pipe end surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 and 2 and will be specifically described.

The thrust dispersing device A according to the present invention is constructed such that a tip conductor 8 equipped with excavating means is fitted to the tip of the earliest buried pipe 7 to be propulsion buried, and the rear end of the tip conductor 8 is inside the buried pipe 7. It is connected to the inner pipe 6 installed in. The inner pipe 6 is manufactured to have substantially the same length as the buried pipe 7, and is connected to the rear one by one simultaneously with the connection of the buried pipe 7. An annular spherical seat 1 is fixed to the outer circumference of the inner pipe 6 at the connection position of the buried pipe 7 at an arbitrary position. On the spherical surface seat 1, a pair of dispersion plates 4 equipped with a connecting plate 3 having a spherical surface receiver 2 that can be tilted in the propulsion direction are installed vertically so as to abut the end faces of the embedded pipe 7. Further, the pair of dispersion plates 4 are connected by two expansion / contraction jacks 5 so that they can be expanded / contracted vertically. As a method of expansion and contraction, a method in which a long hole 9 is provided in the connecting plate 6 and the connecting plate 6 is connected to the dispersion plate so as to be movable up and down is used in the present embodiment. It can also be adopted.

At the position where the disperser A is installed, the peripheral frictional force between the buried pipe 7 to be propulsively buried and the surrounding ground is determined by the buried pipe 7.
It is installed at a position that does not exceed the axial load bearing capacity of.
Further, the penetration force that pushes in the front conductor 8 is transmitted to the rear end of the front conductor 8 via the inner pipe 6.

As the excavation means, an auger system or a muddy system which is a conventional technique is adopted depending on the soil condition.

In this embodiment, the dispersion plate 4 is arranged in the vertical direction, but it may be arranged in the horizontal direction because of workability and the like.

The propulsion method according to the present invention will now be described. The front conductor 8 is installed at a predetermined position in the starting shaft.
While excavating the ground by the excavation means equipped in the lead conductor 8, the lead conductor 8 is pushed into the ground by being pressed by a hydraulic jack or the like which is an original pushing device. When the propulsion of the front conductor 8 is completed, the embedded pipe 7 is fitted to the rear end of the front conductor 8, and the inner pipe 6 installed in the embedded pipe 7 is connected to the rear end of the front conductor 8. When the above work is completed, the original pushing device is installed on the rear end surface of the buried pipe 7 and the rear end surface of the inner pipe 6, and the original pushing device is activated at the time of excavation at the front conductor 8 part, and the buried pipe 7 and the inner pipe 6 are operated. The front conductor 8 and the buried pipe 7 are pushed and buried by pushing.

Until the thrust applied to the buried pipe 7 becomes close to the axial load bearing force of the buried pipe 7, the buried pipe 7 and the inner pipe 6 are sequentially connected, and the buried pipe 7 and the rear end surface of the inner pipe 6 are pressed. The propulsion burial is carried out. When the thrust applied to the buried pipe 7 becomes close to the load bearing capacity of the buried pipe 7 in the axial direction, the inner pipe 6 equipped with the dispersion device A is connected. When the connection of the inner pipe 6 is completed, the telescopic jack 5
Is extended to spread the pair of dispersion plates 4 in the vertical direction and abut on the end surface of the buried pipe 7. When the expansion and contraction of the telescopic jack 5 is completed, the subsequent buried pipe 7 is installed, the end faces of the buried pipe 7 and the inner pipe 6 are pressed from the rear, and the front conductor 8 and the buried pipe 7 are thrust and buried.

The thrust transmission condition at this time will be described. The penetration force of the front conductor 8 is directly transmitted to the rear end of the front conductor 8 through the inner pipe 6. Then, the thrust of the embedded pipe 7 in front of the position where the dispersing device A is installed on the inner pipe 6 is
Is transmitted to the end surface of the buried pipe 7 via. The thrust of the buried pipe 7 behind the dispersing device A is transmitted by the original pushing device mounted at the rearmost part of the buried pipe 7. Further, the buried pipes 7 rearward of the position where the disperser A is installed are sequentially connected and the number gradually increases, and when the axial load resistance of the buried pipe 7 becomes close, the inner pipe 6 equipped with the disperser A is newly added. When connected, the thrust applied to the buried pipe 7 from the rear of the dispersion device A on the front side is dispersed.

When the propulsion is completed, the telescopic jack 5 is contracted and the dispersion plate 4 is pulled back in the vertical direction and stored in the buried pipe 7. Then, it is removed to the vertical shaft side together with the inner pipe 6, and the promotion of the small diameter pipe is completed.

[0021]

[Effects of the Invention] With the thrust dispersing device of the present invention, even if the buried pipe meanders during propulsion, the dispersion plate automatically tilts and follows the front end face of the buried pipe, so that the pipe end surface is always even. Thrust can be transmitted, and long-distance propulsion of small-diameter pipes can be performed safely and reliably.

[0022]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating an installation situation of a thrust distribution device that is an embodiment of the present invention.

FIG. 2 is a front view showing a thrust dispersing device of the present invention.

FIG. 3 is a front view showing a thrust dispersing device according to a conventional technique.

FIG. 4 is a vertical cross-sectional view showing a state of a thrust dispersing device of the related art when the buried pipe is deflected.

[Explanation of symbols]

 A Thrust Dispersion Device 1 Spherical Seat 2 Spherical Bearing 3 Connecting Plate 4 Dispersing Plate 10 Prior Art Dispersing Plate 11 Prior Art Guide Plate 12 Prior Art Telescopic Jack

Claims (1)

[Scope of utility model registration request] 1. A front conductor having excavation means is attached to the tip of the buried pipe, the front conductor is connected to an inner pipe installed in the buried pipe, and the ground is excavated by the excavation means of the front conductor and an inner pipe is formed. In a thruster for a small-diameter pipe that disperses and pushes the rear end of the embedded pipe to propel the front conductor and the embedded pipe, an annular spherical seat is fixed to the outer periphery of the inner pipe at any embedded pipe connection point, and the spherical seat A plurality of expansion / contraction jacks are installed on the top of which a pair of dispersion plates equipped with a connection plate that can tilt in the propulsion direction are placed in contact with the end surface of the embedded pipe, and the pair of dispersion plates are connected to be movable. A thrust dispersing device for a small-diameter pipe, characterized by being provided with.