JPH0354760B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention prevents pipe bodies such as water pipes, sewer pipes, gas pipes, cable pipes, etc., from being damaged during propulsion when they are propelled underground. At the same time, it is easier to propel the vehicle over a longer distance in one go than before.
The present invention also relates to a propulsion method for underground pipes that enables curved propulsion.

``Conventional technology'' Generally, when installing a pre-molded pipe with a relatively small diameter without excavating the ground surface, the propulsion force of the jack is used to remove earth and sand equivalent to the volume of the pipe. There are methods to move things forward, and conventionally there have been the following methods.

That is, FIG. 7 shows a method in which the pipe body 4 is propelled by a head pushing jack 3 installed in the shaft 2 while removing earth and sand with the excavator 1 at the tip.

FIG. 8 shows a case where a soft pipe 4 such as a polyethylene pipe or a PVC pipe is installed, and a separate highly rigid push-in pipe 5 is fitted inside this soft pipe 4 to create a double pipe. This is a method of propelling the shaft by applying a pushing force from the main push jack 3 of the shaft 2 while locking it to the locking part 6 at the tip.

In FIG. 9, a small hole 7 is bored in advance to allow a wire 8 to pass through it, and the tip of the wire 8 is locked to the base of the tube body 4 in one shaft 2a, and the jack 3 of the other shaft 2b is used to lock the tip of the wire 8. This is a method of installing the tube body 4 by pulling the wire 8 and propelling it.

FIG. 10 shows the divided tubes 4 with jacks 9 interposed between them to push the tubes 4 forward while removing the dirt inside.
This is a method of propelling one tube 4 at a time by utilizing the difference in the peripheral surface frictional resistance of the tube groups 4, which is used as a reaction force.

"Problems to be Solved by the Invention" In order to propel the pipe body 4 underground, as shown in FIG. It is necessary to overcome the sum of the tip resistance force G and the tip resistance force G. If the propulsive force P is small as shown in FIG. 12, the tube body 4 will not advance underground. In an attempt to improve this, as shown in Figure 13,
If the cross-sectional allowable proof stress of the tubular body 4 is exceeded, the portion 10 in contact with the jack will be damaged and cannot be moved forward. Therefore, in actual construction, the length of each thrust is determined by taking into consideration the allowable strength of the pipe, the ability of the main thrust jack that can be placed at the base of the pipe, and the frictional resistance of the ground where it is to be installed. Ta.

However, among the conventional methods, the method shown in FIG. 7 has a limit to the propulsion force because the location where the main pusher jack 3 is installed is limited to one location at the base of the tube, and also However, there was a problem in that there was a limit to the propulsive force depending on the material of the tube because it was restricted by the allowable proof stress of the tube.

In the method shown in FIG. 8, the outer soft tube 4 is
Since buckling of the soft tube body 4 can be prevented because it is pulled by the thrust of the original pusher jack 3 applied to the inner highly rigid push-in pipe 5, the thrust force applied to the push-in pipe 5 is limited to one location in the shaft 2. The problem was that the distance that could be propelled in one go was short, as in the case of Figure 7.

The method shown in Fig. 9 is a method of pulling from the front, and since there is only one point of application, the propulsion accuracy depends on the accuracy of boring performed in advance, and the propulsive force applied to the tube body 4 and its limit are had the same problem as in Figure 7.

The method shown in Fig. 10 requires a person to enter the interior of the divided tubes 4 to place the jacks 9 between them, and therefore the inner diameter of the tubes 4 is approximately 70 cm or more Limited and also Jyatsuki 4
There was a problem in that it required a great deal of effort and expense to connect the joints and take waterproofing measures after the... had been removed.

"Means for Solving the Problems" The present invention has been made to solve the above-mentioned problems. Remove the earth and sand from the tip of the push pipe, propel the pipe into the ground, and after completion of the push, connect the new pipe and the push pipe integrally to the forward dimension pipe and the base end of the push pipe, respectively. In addition, the push tube is equipped with intermediate push propulsion devices that can be independently propelled at predetermined intervals, and is connected to each other at predetermined intervals. The intermediate push propulsion devices are operated simultaneously to apply pushing forces to the connected pipe bodies at predetermined intervals while propelling the pipe bodies, and after completion of propulsion, the push pipe is pulled out and the pipe bodies are installed underground. This is a method of propulsion of an underground pipe body characterized by the following.

"Operation" By inserting the push tube equipped with the intermediate push propulsion device at a predetermined interval into the interior of the pipe body to be propelled, a propulsive force of any magnitude within the push tube proof capacity range can be applied at any position. It is now possible to add
It becomes possible to extend the maximum length of propulsion per time at least twice as much as the conventional construction method. This push-in tube can be pulled out leaving the tube body intact to increase the number of intermediate push propulsion devices, unlike conventional construction methods.
There is no need to worry about digging a new shaft and trying to propel the vehicle again in the event that the vehicle is unable to proceed. Since the push tube and the intermediate push propulsion device can be used repeatedly, construction costs can be reduced by reducing the number of shafts and the number of movements of the propulsion machine. Furthermore, by distributing the intermediate thrust propulsion devices at predetermined intervals, it is now possible to always apply tangential propulsion force even to arc-shaped tubes, which is considered impossible with conventional propulsion methods. This also makes it possible to construct curved shapes. In this case, the push tube deforms into a curved shape to match the propulsion tube body, but
By interposing the spacing material at an appropriate interval, the spacing between the tube body and the push-in tube can be kept constant, and this spacing is defined as l/r in Euler curve theory.
(where l is the effective buckling length and r is the secondary radius of the cross section), it will not buckle even if the necessary driving force is applied.
Moreover, the load can be smoothly transmitted to the end.

“Example” An example of the present invention will be described below with reference to the drawings.

In Fig. 1, 11... is a tube body, and this tube body 1
For example, one piece of 1... has a diameter (d ₁ ) of 30 cm and a length (l ₁ ).
The length is 1 to 2 m, and these are successively connected and propelled into the ground. In the hollow portion of this tubular body 11, push-in tubes 12 having a diameter (d ₂ ) of 10 cm and a length (l ₂ ) of 1 to 2 m, for example, are sequentially connected and arranged. This push-in tube 12... has a predetermined interval (L) of, for example, 30 to 50
An intermediate push jack 13 serving as an intermediate push propulsion device is installed at every m interval, and an earth and sand removing device 14 is further attached to the tip. This sediment removal device 1
In addition to the conventionally used rotary excavation method, percussion excavation method, compaction penetration method, etc., the excavation method 4 may also be a method in which compressed water is injected to form a slurry of earth and sand for excavation. Between the push-in pipe 12 and the pipe body 11, a spacer 15 is provided at a predetermined interval (l ₃ ), for example, 50
They are fitted at ~100cm intervals.

16 is a shaft, and this shaft 16 has a reaction plate 17.
A base push jack 19 of the reaction force device 18 that receives the total reaction force of all the propulsive forces of the intermediate push jacks 13 is provided in close contact with the center push jack 13 . Press it tightly. Note that the base end of the tube body 11 is connected to the rail 20
It is propelled while being placed on a pulley 21 that moves.

The intermediate push jacks 13 attached to the push tube 12 will be explained in more detail with reference to FIG. 2. The push-in tubes 12... have a certain length (l ₂ ) and are successively connected, and one of them has an intermediate push-in jack 13.
...is installed. This middle push jack 13
... are attached to the outer periphery of the push-in tube 12 by pins 22, for example, at intervals of 90 degrees. A locking device 23 for locking with the tubular body 11 is provided at the tip of the intermediate push jack 13 . This locking device 23 is
A locking pawl body 24 is provided so as to be able to swing slightly by a connecting piece 25, and this locking pawl body 24 is always kept on the tube body 11 side by a coil spring 27 between it and a ring 26 that is loosely fitted into the push-in tube 12. is being energized. Furthermore, an engagement tube 29 with high mechanical strength is formed with an engagement groove 28 for engaging with the locking pawl 24, particularly at the position of the jack 13 among the tubes 11. are screwed together.

As shown in FIGS. 2 and 3, the spacing member 15 has a hole 30 through which the push-in tube 14 passes, and a water supply tube 31 inserted into the hollow part of the tube body 11 on the outer periphery. It has a through notch 32, and the outer peripheral edge is formed into an arc shape in order to maintain a smooth spacing even when it is tilted. The material used is one with low frictional resistance, such as nylon. Then, the stopper 3 on the outer periphery of the push-in tube 12
3, 33, and is loosely fitted with a gap so that it can be tilted slightly. Then, while maintaining the distance between the tube body 11 and the push-in tube 12, movement in the tube axis direction is not inhibited, and even if the tube body 11, the spacing member 15, and the push-in tube 12 remain in contact with each other, friction loss is reduced. Become.

In the above configuration, the pulley 2 of the shaft 16
A tube body 11 to be propelled is attached to the tube body 1, and a push tube 12 is attached to the hollow portion of the tube body 11. The proximal end of the push-in tube 12 is mounted so as to always protrude slightly rearward from the proximal end of the tube body 11.
Furthermore, a sediment removal device 1 is installed at the tip of this push-in pipe 12.
4 is installed. In addition, this earth and sand removal device 14
For example, a discharge pipe 34 for discharging excavated earth and sand in the form of slurry, a compressed water supply pipe 35, etc. are connected to the pipe.

First, the pipe body 11 is propelled into the ground by removing earth and sand while being pressed by the original pusher jack 19 in the shaft 16. When the propulsion of the first tube body 11 is completed, the pulley 2
1, and install the new tube body 11 by screwing it in, and also attach the spacer 15 at predetermined intervals.
The push-in tube 12 with the attached screws is connected by screwing and propelled again.

After being propelled a certain distance, for example, several tens of meters, the engaging tube 29 is screwed into the tube 11, and the push tube 12 with the intermediate pusher jacks 13 attached thereto is connected to the push tube 12. Then, when this intermediate push jack 13 is operated, the locking claw body 2 at the tip
4 advances toward the inner wall of the tube body 11 while being pressed by the coil spring 27, and enters the engagement groove 28 of the engagement tube body 29.
It is locked in... Furthermore, when the intermediate push jack 13 is operated in synchronization with the earth and sand removal, the reaction force is received by the main push jack 19 of the reaction force device 18 of the shaft 16, and the tube body 11 moves forward. Furthermore, the tube bodies 11... and the push-in tubes 12... are successively connected and moved forward, and when the distance from the first intermediate push jack 13... reaches approximately 30 to 50 meters, the push tube 12 with the intermediate push jacks 13...
and the engaging tube body 29 are connected and moved forward. This operation is repeated to advance until a predetermined length is reached.

In the embodiment described above, the tubular body 11 and the intermediate push jack 13 of the push-in tube 12 are locked using the locking pawl body 24 and the locking groove 28, but the invention is not limited to this. Tire inflation method as shown in the figure,
A cylinder gripper system as shown in FIGS. 5 and 6 may be used. That is, the tire inflation method shown in FIG. It is locked by the friction of the inner wall. Furthermore, in the cylinder gripper system shown in FIGS. 5 and 6, a gripper ring 40 made of steel and rubber that is spread by a gripper jack 39 is provided at the tip of the intermediate pusher jack 13. It locks in place using the friction of the inner wall.

In the embodiment, the length of one tube 11 is 1 to 1.
Although the length was set at 2 m, a longer length can be used. Further, the material of the pipe body 11 can be a rigid pipe such as a steel pipe or a concrete pipe, or a soft pipe such as a polyethylene pipe or a PVC pipe.

In the above embodiment, the case of horizontal and linear propulsion was explained, but the invention is not limited to this.
It can be propelled in any direction: vertical, horizontal, or diagonal. Further, if the earth and sand removing device 14 at the head of the push tube 12 is capable of swinging, curved propulsion is also possible.

``Effects of the Invention'' (1) The maximum length of one thrust can be increased to at least twice as much as the conventional construction method without damaging the pipe body.

(2) The number of vertical shafts to be excavated can be minimized.

(3) Push-in pipes and intermediate jacks can be used repeatedly, reducing construction costs.

(4) Since the intermediate push jacks are distributed, propulsion force can always be applied in the tangential direction not only to straight tubes but also to arcuate tubes, and curved propulsion is also possible.

(5) By interposing the spacing material, buckling can be prevented, especially during curve propulsion, and the load can be transmitted to the tip.

(6) Since the intermediate pushing propulsion device operates and pushes each tube independently, it applies a uniform pushing force to the entire tube even if the tubes to be buried underground are connected one after another. be able to.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view for explaining the method for propulsion of an underground pipe according to the present invention, Fig. 2 is an enlarged sectional view of a propulsion device for intermediate pushing, and Fig. 3 is a line AA in Fig. 2. 4 is a sectional view for explaining the tire inflation method, FIG. 5 is a sectional view for explaining the cylinder gripper method, and FIG. 6 is a sectional view taken along the line B-B in FIG. 5. , Figure 7, Figure 8, Figure 9
1 and 10 are overall sectional views for explaining the conventional propulsion method, and FIGS. 11, 12, and 13 are explanatory views for explaining the propulsion action, respectively. 1, 14... Sediment removal device, 2, 16... Vertical shaft, 3, 19... Main push jack, 13... Intermediate push propulsion device (inside push jack), 15... Spacing retaining material, 18... Main push propulsion device , 23...Locking device, 24...Latching claw body, 27...Coil spring, 2
8... Engagement groove, 29... Engagement pipe body, 38... Tire, 39... Grip pad jack, 40... Grip ring.

Claims (1)

[Claims] 1. While pressing the base end of the tube with a base push jack,
The earth and sand at the tip of the thin push-in pipe inserted into this pipe are removed, the said pipe is propelled into the ground, and after the pushing is completed, the new pipe and push-in pipe are replaced with the base of the pipe in the forward dimension and the push-in pipe. At the same time, the push-in tube is connected at predetermined intervals with intermediate push propulsion devices that can be independently propelled, and the tips of the plurality of middle push propulsion devices are connected to the inner wall of the tube While being locked, the plurality of intermediate push propulsion devices are operated simultaneously to propel the tube bodies while distributing their respective pushing forces to the connected tube bodies at predetermined intervals, and after the propulsion is completed, the push tube is pulled out and the tube is moved. A method for propelling an underground pipe body characterized by installing the body underground. 2. A method for propulsion of an underground pipe according to claim 1, using a plurality of jacks provided at one location as the intermediate push propulsion device. 3. The method for propulsion of an underground pipe according to claim 1, wherein the push-in pipe is supported by a reaction force device in a shaft independently of the pipe and reinserted and removed. 4. The method for propelling an underground pipe according to claim 1, wherein spacing members for preventing buckling are disposed at predetermined intervals between the push-in pipe and the pipe.