JP2001349177A - Propulsion device for sheath pipe jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsion device which is used for a sheath pipe jacking method for laying piping by a non-cut-and-cover tunneling way for fluid transportation to be used for tap water, gases, sewage, etc., and is capable of obtaining long strokes with respect to a relatively short machine body. SOLUTION: In the propulsion device used for the pipe jacking method to newly provide conduits by inserting the insertion opening of a pipe in a receiving opening provided for the rear end part of a proceeding pipe and inserting them in a sheath pipe as joining them together. The propulsion device is provided with a propulsion carriage which is freely moved forward and backward along rails provided for a machine frame, a wire rope to tow the propulsion carriage forward, a group of movable pulleys and a group of fixed pulleys over which the wire rope is turned and stretched, and a fluid cylinder to move the movable pulleys forward and backward. By moving the group of movable pulleys forward by the extension of the fluid cylinder, the wire rope stretched over the group of movable pulleys is towed, and the propulsion carriage is moved forward by the stroke lengthened by the group of movable pulleys to press and propel the pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion apparatus used for a sheath propulsion method in which a fluid transport pipe used for water supply, gas, sewerage or the like is laid without cutting.

[0002]

2. Description of the Related Art As a method of burying a pipe for fluid transportation such as ductile cast iron pipe, a digging method of digging and laying the ground has been generally used. Due to the increasing volume, it is difficult to cut off traffic due to the excavation method. Therefore, only the starting shaft and the reaching shaft are excavated, and a fume pipe or steel pipe is protruded and buried as a sheath pipe, then a ductile cast iron pipe is inserted, and the existing pipe is used as a sheath pipe. The propulsion method such as the pipe-in-pipe method of inserting a new main pipe (new pipe) and updating the pipe line has been widely adopted.

FIG. 7 shows an outline of a conventional pipe-in-pipe method. In this method, a pipe having a smaller diameter is installed in an existing pipe P ′ buried between a starting shaft S and a reaching shaft R. This is a method of inserting a main pipe (new pipe) P. A starting stand D equipped with a hydraulic jack J is installed in the starting shaft,
The rear part of the hydraulic jack abuts against the reaction force receiver H, and the front part presses the main pipe P via a pressing angle B. The main pipes P are sequentially joined by inserting the insertion port 51 at the front end thereof into the receptacle 52 at the rear end of the preceding main pipe, and are pushed into the existing pipe. In addition, a leading sled K for reducing insertion resistance is attached to the tip of the leading main pipe.

In order to reduce the resistance at the time of inserting the main pipe, a method of moving the main pipe while supporting the main pipe with a pipe support device such as a sled or a caster device has been adopted. For example, Japanese Patent Publication No. 5-20636 describes a method in which a socket portion of a pipe joint having elasticity is supported by a sled and a main pipe (new pipe) is propelled into an existing pipe. When the main pipe is propelled by using a sled or a caster device in this way, it is possible to propell the row of main pipes into the sheath with a relatively small force.

[0005]

Since the starting shaft and the arrival shaft are usually cut in narrow places, the length in the propulsion direction cannot be sufficiently large, and conventionally, at most one main pipe is required. There was only space of length. FIG.
FIG. 1 illustrates a conventional propulsion device installed in a starting shaft. The propulsion device 100 includes a starting table 101 and left and right rails 102 and 102 and a hydraulic cylinder (jack) 103.
And a pressing member 104 that moves along the rail is attached to the tip of the hydraulic cylinder, and the rear end of the main pipe P is pressed by the pressing plate of the pressing member. However, the stroke of this type of hydraulic cylinder is shorter than the length of the main pipe (usually about 500 mm).
This could not be propelled with a single press. For this reason, after the hydraulic cylinder has been propelled for one stroke, the hydraulic cylinder is once contracted, and a spacer 105 having a length corresponding to the one stroke is interposed between the hydraulic cylinder and the rear end of the main pipe. The propulsion operation had to be repeated several times, and the propulsion took time and trouble. Although it is conceivable to use a hydraulic cylinder having a sufficiently long stroke, in such a case, both the dimensions and the output become unnecessarily large, causing a problem that it is not only uneconomical but also practically inconvenient.

Further, in this method, only the stroke length obtained by subtracting the length of the hydraulic cylinder from the length of the starting table 101 can be obtained, and therefore, at least the length obtained by adding the length of the hydraulic cylinder to the length of the main pipe. A launch table is required. For this reason,
There was a problem that a shaft that was longer before and after than was actually needed to propel the main pipe was required.

In addition to the method of pushing the main pipe by the hydraulic cylinder and propelling it, as shown in FIG. 8, the main pipe is pulled from the reaching shaft R side by a crane 203 such as a UNIC using a pulley 201 and a wire rope 202. There is a method of pulling directly. This method requires a shaft with a smaller area than the method using the above-mentioned starting platform, but on the other hand, the length of the wire rope is limited by the capacity of the winch drum, and the wire rope comes off the pulley. There was a danger of jumping. Therefore, an object of the present invention is to provide a safe and efficient propulsion device capable of propelling a long distance by one extension using a fluid cylinder installed in a starting shaft.

[0008]

In order to solve the above problems, the present invention employs the following configuration. That is, in the propulsion device for the sheath pipe propulsion method according to the present invention, the pipe insertion port is inserted into a receptacle provided at the rear end of the preceding pipe and joined together, and inserted into the sheath to form a new pipe line. A propulsion device used in a propulsion method, comprising: a propulsion vehicle that can move back and forth along a rail provided on a machine frame, a wire rope that pulls the propulsion vehicle forward, and a movable device on which the wire rope is hung. A pulley, a fixed pulley, and a fluid cylinder for moving the movable pulley in the front-rear direction. The extension of the fluid cylinder moves the movable pulley to pull a wire rope hung on the movable pulley, and the propulsion is performed. The present invention is characterized in that the carriage is moved forward and the tube is pushed and propelled by the propulsion carriage.

In the propulsion device according to the present invention, the pressing member for pressing the main pipe is driven by the wire rope, and the wire rope is hung on the movable pulley and the fixed pulley moved by the fluid cylinder. The amount of expansion and contraction is transmitted in an enlarged manner. For this reason, it is possible to propel a sufficient distance at one time while propelling using the fluid cylinder. If the base of the wire rope is connected to a retracting device that elastically urges the base in the retracting direction, the wire rope can be prevented from loosening when the pressing member is retracted, and the occurrence of trouble due to loosening of the wire rope is prevented. can do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the present invention shown in the drawings.
FIGS. 1 and 2 show an embodiment of a propulsion device according to the present invention. The propulsion device 1 is provided with a hydraulic cylinder (jack) 5 as a fluid cylinder on a starting table 2 installed on the ground. I have. As the fluid cylinder, a cylinder that operates with a liquid other than oil or air can be used, but the most general hydraulic cylinder will be described as an example.
The hydraulic cylinder 5 is installed on a gantry 3 provided on the starting table 2, and a rear end of the hydraulic cylinder 5 is in contact with a frame 2 a of the starting table 2. A support member 5a that supports a plurality of movable pulleys 10,... In parallel at the rod tip of the hydraulic cylinder 5 is provided.

A frame 2b is provided at a position behind the hydraulic cylinder 5, and a plurality of fixed pulleys 1 are mounted on the frame 2b.
A support member 12 that supports the parallel members 1 in parallel is attached. The left and right side frames 14, 14 of the starting table 2 are also provided.
Is made of channel steel, and the upper end of each side frame 14 is a rail 15 extending in the horizontal direction. In the illustrated example, a pair of left and right rails 15, 15 is provided along the direction of propulsion of the main pipe, and guide pulleys 16, 17 are attached to the front end and the rear end of the starting table 2. A wire winding device 20 is installed near the rear end of the starting table 2. The wire winding device 20 includes a pulley (not shown) urged in a winding direction by a spring, and constantly pulls a wire rope 40 connected to the pulley in the winding direction, and pulls out the wire rope. This device automatically winds the wire rope when the directional force is no longer applied. As the winding device 20, for example, a commercially available spring balancer can be used.

On the starting table 2, the left and right rails 15, 1
A propulsion carriage 30 that moves back and forth along 5 is provided. The propulsion trolley 30 has wheels (4 wheels in total in the front, rear, left, and right directions) rolling on the left and right rails 15, 3.
1, 31, 32 and 32 are provided. That is, the wheel support frame 34 projecting forward to the frame 33 of the propulsion carriage 30,
The front wheels 31, 31 are rotatably supported by the wheel support frames 34, 34, and the rear wheels 32, 32 are rotatably supported by shafts provided on the frame 33. ing. Ribs 35a, 35a are provided above the frame 33.
A push plate 35 reinforced by the support member is provided upright. Side plates 36, 36 located outside the rails 15, 15 are provided on both sides of the frame 32. At the lower end of the side plate 36, a guide plate 37 which is bent inward and goes around the rails 15 and 15 is provided integrally. A notch 35 b is formed at the lower end of the push plate 35 so as not to interfere with the front guide pulley 16 and the rear guide pulley 17.

The wire rope 40 attached to the pulley of the winding device 20 is connected to the propulsion carriage 30 via the guide pulley 17 on the rear side. Further, a wire rope 41 for pulling the propulsion trolley forward is attached to a front portion of the propulsion trolley 30. This wire rope 41
Are mounted on the frame of the starting table 2 and are sequentially hung therefrom on a group of movable pulleys 10,... Mounted on the rod of the hydraulic cylinder 5 and on a group of fixed pulleys 11,. Propulsion bogie 3 via guide pulley 16
It is attached to 0.

The propulsion device 1 is installed and used in a starting shaft S. In use, the propulsion trolley 30 is retracted to the rear end of the starting platform 2 forming a machine frame, the main pipe P is supported on the front side, and the insertion port 51 at the front end is inserted into the sheath pipe P ′. To the receiving port 52 of the preceding main pipe.
At this time, a caster device 6 described later is attached to the front end of the main pipe P.
The caster apparatus is supported on a support block (auxiliary table) 47 placed on the starting table 2 so that the insertion port 51 and the receiving port 52 are aligned with each other. The rear end of the main pipe P is supported by a support 48 attached to the propulsion carriage 30. When the hydraulic cylinder 5 is gradually extended in this state, the row of the movable pulleys 10 provided at the tip of the rod advances, so that the propulsion trolley 30 is pulled forward by the wire rope 41 and the push plate 3
At 5, the main pipe P is pushed forward. Thereby, the insertion port 51 of the main pipe P is inserted into the receptacle 52 of the preceding main pipe, and the two pipes are joined. After the insertion port 51 of the main pipe P is inserted into the receptacle 52 of the preceding main pipe, the support block 47 is inserted.
Remove and then promote.

A plurality of sets (three sets in the illustrated example) of the movable pulleys 10 and the fixed pulleys 11 are provided, and the wire ropes 41 are sequentially folded back around these, so that the movable pulley groups 10,. Then, the wire rope 41 is pulled by six times the moving distance of the movable pulley. Therefore, the propulsion trolley 30 connected to the distal end of the wire rope is advanced by six times the moving distance of the movable pulley 10, and the push plate 35 presses the rear end of the main pipe P forward. . Thereby, the row of main pipes is propelled in the sheath P 'toward the reaching shaft R.

FIG. 3 shows the propelled state. After one main pipe P is propelled in this way, the hydraulic cylinder 5 is contracted to move the propulsion carriage 30 backward to the rear end position of the starting platform 2. At this time, the support table 48 is retracted to
Therefore, a temporary base (not shown) prepared separately is arranged between the starting table 2 and the receiving port 52 so that the receiving port 52 is not supported.
Is supported so that it does not hang. When the propulsion trolley 30 moves backward, the support block 47 is mounted on the front end of the starter 2 again, a new main pipe P is set on the starter 2 and the same propulsion as described above is repeated. In addition, the temporary base (square block-shaped or other suitable shape) that supports the receiving port 52 so as not to hang down is supported by inserting the insertion port 51 of the next main pipe into the receiving port 52. It may be removed in the state where it was done.

In this propulsion device 1, assuming that the stroke of the piston rod of the hydraulic cylinder 5 is L, the propulsion carriage 30 can be moved by 6L when the combination of the movable pulley and the fixed pulley is three (for example, L = 500 mm, the moving distance is 3000 mm). Therefore, the main pipe P can be propelled by a necessary length using a hydraulic cylinder having a stroke shorter than the length of the main pipe P.
When the combination of the movable pulley 10 and the fixed pulley 11 is N sets,
The propulsion carriage 30 moves by 2N times the moving distance of the movable pulley, and the main pipe P can be propelled by that distance. For example, when four movable pulley groups and four fixed pulley groups are used, a stroke eight times the stroke of the hydraulic cylinder 5 is obtained.

As described above, the stroke of the hydraulic cylinder 5 is doubled by the combination of the movable pulley group and the fixed pulley group, but the pressing force of the hydraulic cylinder transmitted to the propulsion trolley (ie, the thrust for propelling the main pipe). Is reduced by that amount. For example, φ250 × 2000 (mm) with NS type tube
The theoretical thrust when 100m is propelled by the sheath pipe propulsion method is given by the following equation.

[0019]

(Equation 1)

In the above equation, the friction coefficient μ is small because the caster device 60 that rolls in the sheath and conveys the main pipe.
This is because the mains are promoted using a sled.
As described above, in a mechanism in which a triple set of fixed pulleys and a triple set of movable pulleys are combined and pulled by wire, the thrust of the hydraulic cylinder (jack) 5 is reduced to about 1/6. The thrust is 2.34tf as described above,
A hydraulic cylinder having a thrust six times or more the theoretical thrust may be used as the hydraulic cylinder. It is easy to obtain a hydraulic cylinder of such capacity.

The caster device 60 is attached to a pipe joint. The caster device 60 includes a split arc-shaped member 61 fixed to the outer peripheral portion of the insertion port 51.
a, 61a, and bolts 6 for tightening the split mounting frame and fixing it to the outer periphery of the main pipe
2,62. Ball bearing wheels 55, 55 each of which is a sphere rolling on the inner surface of the sheath P 'are attached to the lower ends of the bolts 62, 62, respectively. The weight of the tube propelled into the pod is the weight of these wheels 55,
Since it is supported by 55, it can be propelled with relatively small thrust. The wheel 55 may be a ball bearing type wheel as shown in FIG. 2 or a caster type wheel 55 'as shown in FIG.

FIG. 4 shows an example in which the rails 15 of the propulsion platform 2 are extended.
The moving distance of the propulsion trolley 30 can be extended by adding the joint frame 2 'provided with 5' and 15 '. A guide pulley 16 similar to the above is attached to the front end of the joint frame 2 '. In addition, only by extending the travel distance of the propulsion trolley,
When a long stroke hydraulic cylinder or a short stroke hydraulic cylinder is used as the hydraulic cylinder 5, it is necessary to increase the number of pairs of the movable pulley 10 and the fixed pulley 11. It is convenient to promote pipes of different lengths by preparing various types of such extension joint frames and fixing the extension joint frames to the basic starting table 2 according to the working conditions with bolts or the like.

[0023]

As is apparent from the above description, the propulsion device for the sheath-tube propulsion method according to the present invention exerts a thrust for pipe propulsion on a propulsion bogie that moves in the axial direction of the pipe and presses the pipe. The stroke of the hydraulic cylinder can be expanded and transmitted by the wire rope hung on the movable pulley and the fixed pulley, so it can be installed in a narrow starting shaft and the pipe can be inserted into the sheath It became. The structure of this propulsion device is simple, economical and robust.

[Brief description of the drawings]

FIG. 1 is a view (a) and a plan view (b) of a propulsion device as viewed from arrows XX.

FIGS. 2A and 2B are a front view and a partial cross-sectional view, respectively, of the propulsion device.

FIG. 3 is a plan view (a) and a partial cross-sectional front view (b) in a state where the propulsion trolley is advanced.

FIG. 4 is a plan view (a) and a partial cross-sectional front view (b) of a propulsion device according to a different embodiment.

FIG. 5 shows ZZ showing different examples of wheels of the caster device.
It is an arrow view (a) and a front view (b).

FIG. 6 is a plan view (a) and a front view (b) showing a conventional propulsion method.

FIG. 7 is an explanatory view showing a pipe-in-pipe method.

FIG. 8 is an explanatory view showing a different pipe-in-pipe method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion device 2 Starter truck 5 Hydraulic cylinder 10 Movable pulley 11 Fixed pulley 15 Rail 16 Guide pulley 17 Guide pulley 20 Retractor 30 Propulsion truck 40, 41 Wire rope 60 Caster device P Main pipe P 'sheath tube

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Naoki Tomita 1-12-19 Kitahorie, Nishi-ku, Osaka-shi, Osaka F-term in Kurimoto Iron Works Co., Ltd. 2D054 AC18 AD37

Claims (3)

[Claims] 1. A propulsion device used in a propulsion method in which a pipe insertion port is inserted into a receptacle provided at the rear end of a preceding pipe and inserted into a seamed sheath to form a new pipe line. A propulsion vehicle that can move back and forth along a rail provided on the machine frame, a wire rope that pulls the propulsion vehicle forward, a movable pulley and a fixed pulley on which the wire rope is hung, and the movable pulley. A fluid cylinder that moves in the front-rear direction, and moves the movable pulley by elongating the fluid cylinder to pull a wire rope hung on the movable pulley, advance the propulsion bogie, and move a pipe with the propulsion bogie. A propulsion device for a sheath pipe propulsion method, wherein the propulsion device is configured to press and protrude. 2. The propulsion device according to claim 1, wherein a plurality of pairs of movable pulleys and fixed pulleys are provided in parallel, and a wire rope is hung on the plurality of movable pulleys and fixed pulleys in order. . 3. A winding device having a pulley biased in a direction of winding the wire rope is provided, and an end of the wire rope pulled out from the pulley of the winding device is connected to a propulsion carriage. Item 3. A propulsion device for a sheath pipe propulsion method according to item 1 or 2.