JP4122242B2 - Pipe pressing device for propulsion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a propulsion method for embedding underground while connecting pipes, and a pipe pressing device and a pipe centering device used therefor.
[0002]
[Prior art]
As a method of embedding fluid transport pipes such as ductile cast iron pipes, only the start pit and the access pit are excavated on the ground, and the pipe is connected from the start pit to the access pit and is buried underground. This propulsion method is widely used because it does not require excavation over the entire length of the pipe. The propulsion method includes a pipe-in-pipe method in which a new ductile cast iron pipe or other fluid transport pipe is inserted into an existing old fluid transport pipe, and a sheath such as a fume pipe or a steel pipe is propelled and buried. There is a sheath propulsion method or the like in which a pipe for transporting fluid such as a ductile cast iron pipe is inserted into the pipe.
[0003]
In this propulsion method, as shown in FIG. 15, a new pipe P having a smaller diameter is inserted into an existing pipe or sheath pipe P ′ buried between the start pit S and the arrival pit R. In the starting pit S, a hydraulic jack J is installed on an insertion base D. The rear portion of the hydraulic jack J abuts against the reaction force receiver F, and the front portion presses the new pipe P via the strut B. It has become. As shown in FIG. 16a, the new pipe P is hung with a crane or the like and lowered into the start pit S, and the insertion port 1 at the tip is inserted into the receiving port 2 at the rear end of the new pipe P, Thereafter, by pushing the outgoing pipe P with the hydraulic jack J, the new pipe P is pushed into the existing pipe (sheath pipe) P ′ as shown in FIGS. 16b and 16c. A leading sled K is attached to the tip of the leading new pipe P (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-276284 Paragraph 0003 FIG.
[0005]
[Problems to be solved by the invention]
In this propulsion method, it is impossible to insert the entire length of the new pipe P only by the extension stroke of the hydraulic jack J (see FIG. 16c). For this reason, after inserting the new pipe P to the full stroke of the hydraulic jack J, the hydraulic jack J is contracted and returned to the original position, and as shown in FIGS. 16b and 16c, the hydraulic jack J and the new pipe P The entire length of the new pipe P is inserted by repeating the operation of inserting an appropriate number of struts B in between and performing the extension action of the hydraulic jack J again.
[0006]
The transportation, insertion, and removal of the strut B require complicated labor and time because the strut B is heavy.
[0007]
Further, since the new pipe P is simply placed on the insertion base D, when the new pipe P is inserted, the new pipe P and the base D and the strut B and the base D are moved in contact with each other. It becomes. For this reason, the movement resistance of the new pipe P and the strut B is large, and a high output hydraulic jack J is required, and it is difficult to obtain a smooth insertion action.
[0008]
Further, when centering the new pipe P with the future pipe P by lifting its insertion slot 1, as shown in FIG. 16a, the new pipe P is centered while being suspended by a crane or the like. Occupying the ground, etc., and work on the ground may be delayed. That is, workability is poor.
[0009]
This invention makes it the 1st subject to eliminate the insertion / extraction of the strut B, and makes it easy to perform centering while being able to move the new tube inserted smoothly.
[0010]
[Means for Solving the Problems]
In order to achieve the first object, the present invention is configured to move a tube pressing device such as the hydraulic jack in the shape of a worm. When moving from a stretched state, it moves to the tip side when it contracts from the stretched state, and when it stretches, it stretches starting from the rear end side of the contracted state, and advances by repeating the operation. Therefore, it is not necessary to interpose the strut B between the hydraulic jack and the new pipe (see FIGS. 1a to 1e).
[0011]
Specific embodiments of the tube extrusion device include a receiving base divided into front and rear, an extender provided between the front and rear receiving bases to contact and separate the both receiving bases, and the both ends in the axial direction of the pipe. The two cradles can be moved to the rails via a one-way clutch, and the telescopic parts of the cradles can be moved on the rails in the shape of the scale insect. A moving configuration can be adopted.
[0012]
In this configuration, if a one-way clutch that acts against the force in the backward direction (stops the backward movement) is used, when the expansion / contraction machine extends, a backward force acts on the rear cradle and stops. A forward force is applied to the front cradle and the vehicle is moved forward. For this reason, a new pipe is moved ahead by advance of a reception stand on the front side. On the other hand, at the time of contraction, a backward force is applied to the front cradle and the vehicle is stopped, and a forward force is applied to the rear cradle to move forward. For this reason, the rear cradle moves forward and approaches the front cradle. In this way, the front and rear cradle move like a scale insect.
[0013]
The one-way clutch is composed of a claw provided on each pedestal so as to be movable up and down, and a hole into which the claw is formed in the rail at equal intervals in the length direction. The claw is pushed so as to move upward in one direction of movement of the cradle and can be moved out of the hole, and the claw is fitted in the hole in movement in the other direction. It is possible to adopt a configuration or the like that prevents the movement.
[0014]
In order to achieve the second object, the present invention receives and guides the lower surface of the backward tube with a roller, and the roller can be moved up and down so that the tube can be centered, or the forward tube is moved backward. When connecting these tubes, the future tube was centered with its lower surface supported.
[0015]
As these centering devices, a configuration is adopted in which the roller is provided at the connection point of the link mechanism, and the link mechanism is raised and lowered by an extender to raise and lower the tube guide roller.
[0016]
Embodiment
This embodiment relates to a sheath tube propulsion method in which a new tube P is inserted into a sheath tube P ′ with an S-shaped joint structure as described in Patent Document 1 and the like. In the S-shaped joint structure, as shown in FIG. 3C, a protrusion 3 is provided at the tip of the insertion slot 1, and a lock ring 5 is provided on the inner surface of the receiving slot 2, and a rubber ring 6 and a backup ring 6a are interposed. After the insertion port 1 is inserted into the receiving port 2, the push ring 9 is applied to the rubber ring 6 through the split ring 9a, and the stud bolt 12 is screwed into the receiving port 2 through the push ring 9 and fastened. The rubber ring 6 is pushed in and sealed.
[0017]
An annular flange (saddle band) 10 with a guide roller is fitted on the outer periphery of the insertion port 1 outside the receiving port 2, and a protective ring 13 is interposed between the flange 10 and the stud bolt 12 (end surface of the receiving port 2). A propulsive force transmission material 14 is provided. This propulsive force transmission member 14 is a ring-shaped member divided into two in the circumferential direction.
[0018]
First, as shown in FIG. 3 (a), the S-shaped joint is inserted into the receiving port 2 with the insertion port 1 up to the position of the specified body dimension L, and the receiving port 2 and the insertion port 1 are joined. Shift the protective ring 13 to the position where it hits the head of the bolt 12 and attach the two-part propulsive force transmission material 14 in the form of a ring (FIG. 2 (b)). And fasten (Fig. 3C). In this state, a propulsive force is applied by the hydraulic jack J to propel the vehicle from the start pit S toward the arrival pit R.
[0019]
As shown in FIG. 1A, the propulsion work is performed by lowering the new pipe P to the pipe pushing device 20 and the new pipe centering device 40 in the start shaft S by a crane or the like as shown in FIG. 1a. Both devices are provided on a leg H, and as the leg H, H steel or square bar can be used. The leg H and the rail 21 of the tube extrusion device 20 constitute a starting base.
[0020]
The tube extrusion device 20 includes the rail 21 in the propulsion direction (tube axis direction) and an extender 30 that moves on the rail 21, and the rail 21 has locking holes at a constant pitch on both sides as shown in FIG. 22 is formed. The pitch is appropriately selected in consideration of the extension amount of the expansion / contraction machine 30 described later so that the expansion / contraction apparatus 30 can move smoothly in the shape of a worm. Depending on the length of the new pipe P and the size of the start pit S, the rail 21 is used in combination of several types of appropriate lengths. At that time, each rail 21 is structured to be connectable by bolting or the like.
[0021]
As shown in FIGS. 2 and 5, the extender 30 includes front and rear receiving bases 31 a and 31 b, a hydraulic jack 32, and a locking claw 33, and two engagements are provided on both sides of the receiving bases 31 a and 31 b. A stop hole 34 is formed. The outer locking hole 34 penetrates the lower surface, and when the locking claw 33 is inserted into the locking hole 34, the locking claw 33 penetrates and corresponds to the locking hole 22 of the rail 21 so as to be freely inserted and removed . The inner locking hole 34 does not penetrate. The locking claw 33 has an inclined surface 33a that faces downward from the front to the back (see FIG. 5), and is inserted into the outer locking holes 34 of the receiving bases 31a and 31b (inserted fitted state). When the cradle 31a, 31b moves forward (rightward in FIG. 5), the locking claw 33 moves up with the inclined surface 33a even if it is fitted in the locking hole 22 of the rail 21. Then, the fitting with the locking hole 22 is released, and the movement of the receiving bases 31a and 31b is allowed. On the other hand, when the cradle 31a, 31b moves backward, the locking claw 33 is fitted into the locking hole 22 of the rail 21, and the vertical rear surface 33b abuts on the rear surface of the locking hole 22 to receive the locking claw 33. The movement of the bases 31a and 31b is prevented.
[0022]
A hydraulic jack 32 is provided between the front and rear receiving bases 31 a and 31 b, and the receiving bases 31 a and 31 b are brought into contact with and separated from each other by the expansion and contraction of the hydraulic jack 32. For this reason, when the hydraulic jack 32 is extended from the state shown in FIG. 2a, the rear receiving base 31b is stopped, the front receiving base 31a is moved forward as shown in FIG. 2b, and the hydraulic jack 32 is fully extended. At this point, the locking claw 33 of the front receiving base 31 a is fitted into the locking hole 22 of the rail 21. From this state, when the hydraulic jack 32 contracts, the front receiving base 31a stops, and as shown in FIG. 2c, the rear receiving base 31b moves forward, and the hydraulic jack 32 has fully contracted. As shown in FIG. 4, the locking claw 33 of the rear receiving base 31 b fits into the locking hole 22 of the rail 21. This action is repeated, and the extender 30 advances in the shape of a scale insect. In the figure, 36 is a rolling roller, and 37 is a tube mounting table. Note that the hydraulic pressure is switched to the hydraulic jack 32 instantaneously by operating a lever (not shown).
[0023]
The new tube centering device 40 is installed in the front upper surface groove portion of the rail 21 as shown in FIGS. 1 and 4, and as shown in FIGS. 7 and 8, the hydraulic jack on the base 41 is installed. 42 and a link mechanism 43, and a receiving roller 44 is provided at a connection point of the link mechanism 43. When the hydraulic jack 42 extends from the contracted state of FIG. 7 as shown in FIG. 8, the link mechanism 43 rises and the roller 44 rises. For this reason, if the roller 44 receives the lower surface of the front portion of the new pipe P and adjusts the degree of elevation, the new pipe P can be centered.
[0024]
As the new pipe centering device 40, the hydraulic jack 42 may be a link of the link mechanism 43 as shown in FIG. 9. This is moved up and down by receiving the new pipe P by the action of (a) to (b) or (b) to (a) by contraction of the hydraulic jack 42. This device 40 is shorter and more compact than that of FIG. The roller 44 is made of a material that does not damage the new tube P, such as resin or rubber.
[0025]
As shown in FIG. 10, the forward pipe support device 50 is provided with a hydraulic jack 51 on a leg H, and a pedestal 52 is provided at the tip of the hydraulic jack 51. For this reason, as shown in the figure, the hydraulic jack 51 is extended and the lower surface of the receiving portion of the pipe P is supported by the pedestal 52 and maintained at a predetermined level (centered). The cradle 52 is made of metal, and considering that the pipe P is not damaged, an elastic material such as rubber may be provided on the upper surface (the cradle surface) of the cradle 52. As another means for not damaging the tube P, it is conceivable to make the cradle 52 itself made of resin.
[0026]
The structures of the new tube centering device 40 and the future tube support device 50 can be mutually converted. That is, the latter can be replaced with the hydraulic jack 51 shown in FIG. 10 as the link mechanism 43, and the former can be replaced with the hydraulic jack 51 standing up instead of the link mechanism 43 shown in FIGS. However, the link mechanism 43 converts the movement of the jack 42 in the horizontal direction into the vertical movement of the roller 44 and supports the new pipe P, so that the link mechanism 43 is moved up and down like the jack 51 of the forward pipe support device 50. Does not require a large space. For this reason, it is advantageous when installing on the rail 21 with no space in the vertical direction.
[0027]
As described above, the pipe pushing device 20 and the like are provided in the start pit S. As described above, when the new pipe P is lowered in the start pit S as shown in FIGS. As shown, the propulsive force transmission member 14 and the like are attached to the outer peripheral surface of the insertion port 1 of the new pipe P. The attaching operation of the propulsive force transmission member 14 and the like can be performed before the new pipe P is lowered. Further, the centering device 40 and the support device 50 center and support the new pipe P and the forward pipe P.
[0028]
After or before the installation of the propulsion force transmission member 14, the tube pusher 20 pushes and advances the new tube P and inserts the insertion port 1 into the receiving port 2 of the future tube P as shown in FIG. The S-type joint structure shown in FIG.
[0029]
After the S-shaped joint structure is obtained, as shown in FIGS. 1c to 1d, the pipe pushing device 20 is advanced by expanding and contracting the hydraulic jack 32 while the S-shaped joint structure is maintained. The new pipe P is pushed and pushed by the advance of the front receiving base 31a, and the new pipe P is further pushed. When the new pipe P is inserted into the sheath pipe P ′ made of a fume pipe up to the state shown in FIG. 1e, the locking claws 33 of the front and rear receiving bases 31a and 31b are removed from the outer locking holes 34 and the inner locking is performed. Reinserting into the hole 34 eliminates the engagement with the locking hole 22. Thereby, the pipe | tube extrusion apparatus 20 can be moved back, and is returned to the initial position of FIG. 1a by appropriate means, such as human power. At this time, an electric motor can be provided in the tube extrusion device 20 so that the roller 36 or the like can be rotated for self-running. Further, by inserting the locking claw 33 into the locking holes 34 and 22 in reverse (the inclined surface 33a is directed backward), the expansion / contraction machine 30 (hydraulic jack 32) can be retracted.
[0030]
Thereafter, by repeating the above-described action, the new pipes P are sequentially inserted toward the reaching pit R to form a pipe line.
[0031]
In the above embodiment, the insertion port 1 is inserted into the receiving port 2 by the amount L of the body from the beginning. However, as shown in FIG. 11, the insertion of the body size L + α is initially performed, and finally, the insertion port 1 is further inserted. The present invention can be similarly adopted in the embodiment in which the body size L is inserted. That is, as shown in FIG. 11A, the protrusion 1c is welded to an appropriate position for supporting the flange 10 of the insertion slot 1, and the insertion slot 1 is inserted slightly shorter (length α) than the body size L. . Thereafter, as shown in FIGS. 2B to 2C, the protective ring 13 and the propulsive force transmission material 14 are applied to the bolt 12 of the receiving port 2, and the insertion port 1 is inserted as shown in FIG. Further, by inserting the flange 10 into contact with the propulsive force transmission member 14, the body size L is obtained. Thereafter, the new pipe P is promoted in the same manner as the above-described embodiment.
[0032]
Since the receiving port 2 (forward new tube P) should not move when inserting into the body size L, the receiving reaction plate 60 shown in FIG. 13 is placed between the forward tube P and the sheath tube P ′. To intervene. The receiving reaction plate 60 includes a frame body 61 fitted inside the receiving opening 2 of the forward pipe P, and a receiver 62 screwed into a square of the frame body 61, as shown in FIGS. 12a and 12b. Then, the frame body 61 is fitted into the future new pipe P, and the receiver 62 is rotated to advance and retreat, so that the receiver 62 comes into contact with the end surface of the sheath pipe P ′ and the receiving reaction force plate 60 is fixed to the future new pipe P. (The forward new pipe P is not allowed to move in the direction of the receiving port 2), so that the forward new pipe P is prevented from moving in the propulsion direction with respect to the sheath pipe P ′. In this state, when the new tube P is propelled by the tube extruding device 20 and becomes the joined state of the body size L in FIG. 11 (d), the receiving reaction force plate 60 is removed and the above-described propulsion action is performed. To do. As shown in FIG. 14, the rail 21 has a support structure in which two nuts 71 are screwed into a leg 70 inserted through the U-shaped side plate 21a of the rail 21 through the side plate 21a. Various means such as positioning the rail 21 at a required height at the screwing position can be employed.
[0033]
Each of the above embodiments was the case of the S-type joint sheath pipe propulsion method, but various joint modes such as NS type joints and pipe-in-pipe methods of the various joint modes, as well as the sheath pipe P The present invention can also be applied to a method for excavating and propelling pipes P without being embedded in the soil, for example, excavating and propelling methods for sheath pipes such as fume pipes and steel pipes in the sheath pipe propulsion method. Of course.
[0034]
【The invention's effect】
According to the present invention, since the tube is pushed in by moving in the shape of a worm as described above, workability is improved because there is no need to interpose a strut or the like.
[Brief description of the drawings]
FIG. 1a is a diagram showing a propulsion action of the embodiment. FIG. 1b is a diagram showing the propulsion action. FIG. 1c is a diagram showing the propulsion action. FIG. 1e is a diagram showing the propulsion action. Fig. 2b Fig. 2c Fig. 2c Fig. 2d Fig. 2d Fig. 2d Fig. 2d Fig. 2d Fig. 2d Fig. 2d Fig. 2d FIG. 4 is a partial plan view of the embodiment. FIG. 5 is a perspective view of a main part of the tube extrusion device of the embodiment. FIG. 6 shows the rail of the embodiment. b) right side view, (c) front view. FIG. 7 shows the tube centering device of the embodiment, (a) is a plan view, and (b) is a front view. [FIG. 8] tube centering device. Fig. 9 shows another example of the tube centering device, (a) is a front view, (b) is an operation diagram, Fig. 10 shows the tube support device, (a) is a left side view, (B) is the main part front FIG. 11 is a diagram of the pipe connection action of another embodiment. FIG. 12a is a driving action diagram of the embodiment. FIG. 12b is a cutaway left side view of FIG. 12a. , (A) is a front view, (b) is a right side view [FIG. 14] shows another embodiment, (a) is a schematic front view, (b) is a left side view [FIG. 15] Explanatory drawing [FIG. 16a] Operation diagram of conventional example [FIG. 16b] Operation diagram of conventional example [FIG. 16c] Operation diagram of conventional example [Explanation of symbols]
P propulsion pipe P 'sheath pipe (existing pipe)
H leg S start pit R arrival mine 1 insertion port 2 receiving port 3 insertion port projection 5 lock ring 10 flange 14 propulsion force transmission material 20 pipe extrusion device 21 rail 22 rail side locking hole 30 telescopic device 31a front side receiving base 31b rear side Receiving base 32 Hydraulic jack 33 Locking claw 34 Telescopic machine side locking hole 40 New pipe centering device 41 Base 42 Hydraulic jack 43 Link mechanism 44 Receiving roller 50 Forward pipe support device 51 Hydraulic jack 52 Receiving base

Claims (3)

The following pipe (P) is used for a propulsion method in which the subsequent pipe (P) is connected to the future pipe (P) while being pushed and propelled and buried underground. A pressing device (20) comprising:
The stretcher (32) provided between the cradle (31a, 31b) divided into the front and rear, the cradle (31a, 31b) at the front and back, and contacting and separating the cradle (31a, 31b); It consists of a rail (21) for moving the two pedestals in the axial direction of the pipe (P), and the two pedestals (31a, 31b) are movable to the rail (21) via a one-way clutch. , by expansion and contraction of the telescopic device (32), wherein both bearers (31a, 31b) to move the rail (21) on the inchworm shape and the advancement of the front cradle (31a), the rear flights The pipe (P) is pushed and propelled, and after pushing and propelling the one subsequent pipe (P), the pipe is moved back to the initial position of the push propulsion ,
And the said one-way clutch has the nail | claw (33) provided in each cradle (31a, 31b) so that vertical movement was possible, and the said nail | claw (33) formed in the said rail (21) at equal intervals in the length direction. It is composed of a hole (22) that can be freely inserted and removed, and the fitting state in which the claw (33) is inserted into the hole (22) is a one-way movement that is the propulsion direction of the cradle (31a, 31b). The claw (33) is pushed so as to move upward and is removed from the hole (22) to allow the cradle (31a, 31b) to move. 22), the movement of the cradle (31a, 31b) is prevented, and the state in which the claw (33) is removed from the hole (22) is the direction of the cradle (31a, 31b) and What Do allow other movement is, it retreats to the initial position by the movement of the other direction Preparative jacking method pipe pressing device according to claim.   The claw (33) has an inclined surface (33a) whose lower surface is inclined downward and rearward in the one direction, and is moved upward and pushed by the movement in the one direction of the cradle (31a, 31b). 2. The tube pressing device for propulsion method according to claim 1, wherein the tube pressing device is capable of moving the receiving base (31a, 31b) out of the hole (22).   The fitting state in which the claw (33) is inserted into the hole (22) so that the inclined surface (33a) is inclined downward and rearward in the other direction is in addition to the cradle (31a, 31b). 3. The pedestal (31a, 31b) according to claim 2, characterized in that the claw (33) is pushed so as to move upward in the direction of movement to disengage from the hole (22) and allow the cradle (31a, 31b) to move. Pipe pressing device for propulsion method.

Images