JP3781145B2 - Propulsion device for small diameter pipe burying machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a propulsion device applied to a small-diameter pipe embedding machine that continuously embeds small-diameter pipes in the ground.
[0002]
[Prior art]
A small-diameter pipe burying machine that continuously embeds multiple small-diameter pipes into the ground has a propulsion device installed in a narrow start shaft, drives the leading pipe, and extends the propulsion cylinder to A small-diameter pipe burial path is dug, and a plurality of small-diameter pipes are sequentially buried in the above-mentioned conduit while being buried in the ground. The propulsion of the small-diameter pipe at this time is to extend the propulsion cylinder along the frame of the propulsion device, transmit the thrust to the push plate, and press the rear end face of the small-diameter pipe through the push plate. Is made by
[0003]
By the way, in the conventional small diameter pipe propulsion device, as disclosed in, for example, Japanese Utility Model Laid-Open No. 5-10598, the piston rod end of the propulsion cylinder is pivotally attached to the reaction force receiving portion, The cylinder tube end of the cylinder is generally configured to reciprocate along the frame. In this case, as described in the same publication, a drive device such as a screw conveyor or a cutter head reciprocates along with the cylinder tube of the propulsion cylinder. This is because the drive shaft portion of the drive device is connected to the shaft end of the screw conveyor that is propelled together with the propulsion of the small-diameter pipe, and therefore it is necessary to always move it in accordance with the propulsion speed of the small-diameter pipe. is there.
[0004]
Japanese Patent Laid-Open No. 4-73397 discloses a propulsion mechanism that, unlike the above-described general arrangement of the propulsion cylinder, pivots the cylinder tube to the reaction force receiving portion and reciprocates the piston rod end. Yes. The characteristic feature of the propulsion device disclosed in the publication is that the propulsion force of a pair of upper and lower propulsion cylinders is transmitted to a pusher that presses the rear end of a small-diameter pipe. First and second thrust transmission members that contact the push ring are respectively attached to a free end and an intermediate portion of a mandrel extending rearward from the central portion, and the rear portion of the mandrel is extended when the first propulsion cylinder is extended. The first propulsion transmission member fixed to the free end is brought into contact with the push wheel for propulsion, and when the propulsion is completed, the second propulsion transmission member is attached to the intermediate portion of the mandrel to perform the second propulsion. A single small-diameter pipe is embedded by two expansion / contraction operations of the propulsion cylinder. In order to realize the miniaturization of the propulsion device and to embed a new small-diameter pipe that follows, a push ring made of a wire and a pulley Return mechanism It is intended to return to the automatic original position the junk ring in conjunction with shrinkage operation more propulsion cylinder.
[0005]
Therefore, this Japanese Patent Application Laid-Open No. 4-73397 does not describe any effective propulsion mechanism for pivotally attaching the cylinder tube to the reaction force receiving portion and reciprocating the piston rod end. In addition to the hydraulic circuit to the cylinder, the arrangement of the hydraulic pipes or the arrangement of the driving device for driving the screw conveyor or the like is not considered at all, and this publication does not disclose anything at all. Absent. Except for the propulsion transmission structure, the embedding operation by the two strokes of the propulsion cylinder is a known technique for embedding the buried pipe.
[0006]
[Problems to be solved by the invention]
In general, hydraulic pressure is supplied to and discharged from the propulsion cylinder through a hydraulic hose from a hydraulic unit installed outside the shaft. For the reasons described above, the hydraulic cylinder is reciprocated in conjunction with the reciprocating motion of the propulsion cylinder. Supply and discharge of hydraulic pressure to and from reciprocating equipment such as a driving motor that is moving is made by piping to a control unit provided at the top of the drive unit, and a hydraulic hose connected to the hydraulic unit outside the shaft is connected to the hydraulic inlet / outlet In addition, it is connected to reciprocating equipment such as the drive motor. For these connections, flexible hydraulic hoses are used, and are connected in a state where they are exposed to the outside with a margin in length to allow a certain amount of bending motion.
[0007]
However, as disclosed in Japanese Utility Model Laid-Open No. 5-10598, the piston rod end of the propulsion cylinder is pivotally attached to the reaction force receiving portion, and the cylinder tube end of the cylinder reciprocates along the frame. In the propulsion device configured as described above, since the hydraulic port of the cylinder tube of the propulsion cylinder reciprocates, a hydraulic hose is connected to the control unit together with the drive device, and several other hydraulic pressures A predetermined stroke is reciprocated with the hose exposed. This is not only an obstacle to work in a narrow work space, but also not preferable from the viewpoint of work safety. Furthermore, during excavation, debris and gravel may fly to the hoses and cause damage.
[0008]
On the other hand, the propulsion device disclosed in the above Japanese Patent Laid-Open No. 4-73397 is a type in which at least two propulsion cylinders are arranged above and below a single frame as long as the thrust transmission member is attached to the mandrel. The second thrust transmission member that transmits thrust to the push wheel during the second propulsion is composed of two components and is attached to and detached from the mandrel. Although it is configured freely, it is necessary to fasten both components with bolts etc. after engaging each other's teeth when attaching and detaching, which not only makes the attachment and removal work complicated, but also makes the structure complicated In addition, due to its configuration, the detachment work must be performed from the side of the propulsion cylinder, and it is difficult to detach the work in an extremely narrow shaft. Transmitter The easy to drop, there remain many problems in terms of safety.
[0009]
The present invention has been made to solve the above-described problems. Specifically, the configuration is simple, the switching operation of the mounting position of the thrust transmission member is easy, and the number of hydraulic hoses exposed outside the machine is reduced. An object of the present invention is to provide a propulsion device for a novel small-diameter pipe burying machine that can be minimized.
[0010]
[Means for solving the problems and effects]
The above object is a propulsion device for a small-diameter pipe burying machine that is installed in a vertical shaft, which is the main configuration of the present invention, and embeds a small-diameter pipe into the ground, and is disposed above each pair of left and right frames. At least one propulsion cylinder, a push plate that contacts the rear end surface of the small-diameter pipe and propels the small-diameter pipe by the propulsion force of the propulsion cylinder , and the propulsion force of the propulsion cylinder is applied to the push plate. A thrust transmission member for transmitting, a cylinder tube of the propulsion cylinder is fixed to a reaction force receiver installed at a rear end portion of the frame, and the thrust transmission member is fixed to an end of a piston rod of the propulsion cylinder. Te becomes, the thrust transmission member along said longitudinal direction of each propulsion cylinders, and left and right cylinder tube and at least a pair of upper and lower first thrust transmission member arranged at a distance from each other in the vertical direction, the first Thrust A space formed between the cylinder tube and the first thrust transmission member disposed above and below, the second thrust transmission member having a configuration capable of engaging with and disengaging from the attraction member and capable of coming into contact with the push plate actuating hydraulic pipes of the propulsion cylinder is achieved by the propulsion device of a small diameter pipe burying machine characterized by comprising arranged in part.
[0011]
The cylinder tube of the propulsion cylinder is fixed to a reaction force receiver installed at the rear end of the frame, and the thrust transmission member is fixed to the end of the piston rod of the propulsion cylinder. The installation position of the cylinder is fixed and does not move, and the pair of upper and lower first thrust transmission members are arranged apart from the cylinder tube in the vertical direction, so that it is flexible as a hydraulic hose. It is possible to use a large number of hydraulic tubes, and almost all of the hydraulic hoses exposed outside the conventional machine, except for the hydraulic hoses of the drive device that reciprocates in accordance with the propulsion work, are inside the device and It will be possible to fix it in a place where interference with other equipment can be avoided.
[0012]
Therefore, not only can a narrow working space in the shaft be used effectively, but also the safety of the work and the damage of hydraulic hoses due to the arrival of debris and gravel during excavation can be reduced. Become.
[0013]
In particular, to prevent the damage of the hydraulic hoses, the first thrust transmission member is a plate member having a length substantially equal to the promotion cylinders, is substantially equal to the outer diameter of the plate width is the propulsion cylinder It is desirable that
[0014]
And as a propulsion device of the present invention, when one propulsion cylinder is arranged above each of the left and right frames, and at least two propulsion cylinders are arranged above and below the left and right frames, respectively. There is a case. In the former case, it is suitable for propulsion that does not require large thrust, such as a synthetic resin tube such as a vinyl tube or a very small diameter buried tube, and in the latter case, a relatively large diameter steel tube. It is suitable for propulsion when a large thrust is required.
[0015]
Further, if a rolling element that rolls on the frame is attached to the longitudinal front end of the first thrust transmission member, the propulsion cylinder can be smoothly expanded and contracted, and the cantilever type cylinder rod end The operating posture of the long first thrust transmission member attached to the can be stabilized.
[0016]
Furthermore, the left and right side edges of the first thrust transmission member have at least a pair of engagement recesses for engaging and disengaging the second thrust transmission member, and the second thrust transmission member is engaged with the engagement recess. When the second thrust transmission member is engaged with and disengaged from the upper side of the first thrust transmission member, the second thrust transmission member can be easily engaged and disengaged from above the first thrust transmission member. Since the operation is simple, the engagement / disengagement operation is easy even in a narrow shaft, and the second thrust transmission member is not dropped on the installation surface of the propulsion device. Can prevent damage.
[0017]
In particular, when the engaging recesses are formed at least at both ends in the longitudinal direction of the first thrust transmission member, the second thrust transmission member can be made to the first thrust transmission member even by a short propulsion cylinder. By switching the engagement position according to the operating state of the propulsion cylinder, it is possible to embed a long small-diameter pipe.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view showing a part of the overall configuration of the small-bore diameter propulsion device according to the first embodiment of the present invention, and FIG. 2 is a front view thereof. The present embodiment is a type of propulsion device in which a pair of propulsion cylinders are arranged in one stage on the left and right.
[0019]
In these drawings, reference numeral 1 denotes a propulsion device installed in the start shaft A, and has a pair of frames 2 on the left and right when viewed from the front. The frame 2 is made of a pair of H-shaped steels parallel to the propulsion direction of the small-diameter pipe 3, and the pair of frames 2 are connected and fixed at two front and rear positions by connecting rods 2a in the middle portion in the length direction. Further, screw-type reaction force receivers 4 are screwed at the front and rear ends of each frame 2.
[0020]
Reference numeral 5 denotes a propulsion cylinder. The propulsion cylinders 5 are arranged in parallel to the longitudinal direction of each frame 2 and are arranged above each frame 2 by a predetermined distance. The bottom portion of the cylinder tube 5 a of each propulsion cylinder 5 is pivotally supported via a pin 7 on a bracket 6 erected on the rear end of the frame 2. The propulsion cylinder 5 according to this embodiment is a double-acting hydraulic cylinder.
[0021]
1 and 2, reference numerals 8 a and 8 b are a pair of first thrust transmission members disposed with a necessary gap space above and below the propulsion cylinder 5, and have substantially the same length as the propulsion cylinder 5. And it consists of a metal plate having a width substantially equal to the outer diameter of the cylinder tube 5a of the propulsion cylinder 5. The first thrust transmission members 8a and 8b are disposed in the pair of left and right propulsion cylinders 5, respectively. According to the illustrated example, the first propulsion transmission members 8a and 8b are respectively opposed to the front end portion in the longitudinal direction, the portion approximately 2/3 from the front end, and the rear end portion orthogonal to the longitudinal direction as shown in the figure. A recessed portion 9 is formed on the side edge. A second thrust transmission member 13 described later is engaged with and disengaged from the recessed portion 9.
[0022]
As shown in FIG. 2, the rear ends of the first thrust transmission members 8a and 8b are fitted into a rectangular cylinder 8c to fix the vertical position thereof, and the rear end of the upper first thrust transmission member 8a. A window portion 8a 'is opened, and a drum-shaped roller 10 is rotatably attached to a shaft portion 8d extending in the width direction of the first thrust transmission member 8a. The drum-shaped roller 10 abuts on the upper peripheral surface of the cylinder tube 5a to rotate and guide, so that a gap space between the upper and lower first thrust transmission members 8a and 8b and the rear end portion of the propulsion cylinder 5 is formed. Keep constant.
[0023]
A rectangular parallelepiped block 8e is inserted and fixed between the upper and lower first thrust transmission members 8a and 8b at the front ends of the first thrust transmission members 8a and 8b, and the cylinder rod 5b of the propulsion cylinder 5 is fixed to the block 8e. The tip of is pivoted through a pin 11. Therefore, when the cylinder rod 5b expands and contracts by the operation of the propulsion cylinder 5, the first thrust transmission members 8a and 8b reciprocate together.
[0024]
As described above, the rolling rollers 12a and 12b are provided at the front ends of the first thrust transmission members 8a and 8b, which are held by the rectangular cylinder 8c and the block 8e, via the brackets 12 that are suspended downward. It is attached. Each of the rolling rollers 12a and 12b rolls in contact with the upper surface and the side surface of the frame 2.
[0025]
FIG. 3 shows an engagement state between the first thrust transmission members 8a and 8b, which are constituent members of the present invention, and the second thrust transmission member 13 engaged with and disengaged from the first thrust transmission members 8a and 8b. . According to the figure, the second thrust transmission member 13 according to the present embodiment is made of a metal frame material having a portal shape as a whole, and the left and right leg portions 13a thereof are the first thrust transmission members 8a, It engages with the recess 9 formed in 8b. A handle 13c made of a metal bar that is also bent in a gate shape is attached to the upper surface of the horizontal frame portion 13b of the second thrust transmission member 13. The second thrust transmission member 13 can be engaged with and disengaged from the upper and lower first thrust transmission members 8a and 8b simply by raising and lowering the left and right leg portions 13a with the handle 13c facing downward. Is done.
[0026]
A small-diameter tube pressing plate 14 is disposed so as to be positioned behind the second thrust transmission member 13 in the propulsion direction and straddle the left and right propulsion cylinders 5 together with the first propulsion transmission members 8a and 8b. In the illustrated propulsion device 1, the screw casing push plate 15 is provided separately from the small-diameter tube push plate 14 so as to operate independently. Since these configurations are known, the configuration of the small-diameter tube pressing plate 14 will be briefly described here. Ear portions 14a protrude from the left and right ends of the small-diameter tube pressing plate 14, and the left and right propulsion cylinders 5 are inserted into the ear portions 14a together with the first thrust transmission members 8a and 8b. A rectangular insertion hole 14b is formed, and the second thrust transmission member 13 is inserted into the recessed portion 9 which is an engaging portion of the second thrust transmission member 13 formed in the first thrust transmission members 8a and 8b. By engaging with the above-described simple operation, the propulsive force of each propulsion cylinder 5 is transmitted to the small-diameter tube pressing plate 14 via the first thrust transmitting members 8a and 8b and the second thrust transmitting member 13.
[0027]
As is well known, a screw conveyor driving device 15 is fixed to the central portion on the back side of the small-diameter tube pressing plate 13 with a driving shaft (not shown) protruding forward. The driving device 16 and the small-diameter tube pressing plate 13 are connected and fixed via a connecting member 18 shown by a broken surface in FIG. The connecting member 18 is formed of a rectangular frame having a cavity into which the propulsion cylinder 5 and the first thrust transmission members 8a and 8b can be inserted, and formed on the upper and lower walls of the first thrust transmission members 8a and 8b. A leg portion insertion hole 13 a for inserting the leg portion 13 a of the second thrust transmission member 13 is formed in a portion corresponding to the recessed portion 9 made. A wheel 18c is attached to the bottom of the connecting member 18 via a bracket 18b to roll on the frame 2 and support the weight of the small-diameter tube pressing plate 13 and the driving device 16. The configuration of the driving device 16 is not particularly specified, and a conventional general driving device can be applied.
[0028]
Next, the piping mode of the hydraulic hoses centering on the propulsion cylinder 5 according to the present embodiment will be described in detail. 4 to 6 show piping diagrams of the hydraulic hose. According to these figures, the propulsion cylinder 5 is a double-acting type, and its hydraulic inlet is provided at two locations on both front and rear ends of the cylinder tube 5a. The hydraulic tubes 17a and 17b connected to the hydraulic hose connection ports 5c and 5d are made of metal pipes, and are accommodated in a gap space between the lower first thrust transmission member 8b and the propulsion cylinder 5, and the cylinder tubes 5a. Are connected to each other via flexible hydraulic hoses 17c and 17d which are bent downward at the rear end as shown in FIG. Since the hydraulic tubes 17a and 17b are arranged below the cylinder tube 5a of the propulsion cylinder 5 in this way, the hydraulic tubes 17a and 17b do not interfere with the leading conduit and the small-diameter tube 3 that are not shown in the figure and descend from the top by a crane or the like. In addition, it is possible to prevent the hydraulic path from being destroyed by being caught. Further, since the lower first thrust transmission member 8b is disposed below the hydraulic tubes 17a and 17b, for example, hitting by earth and sand or gravel flying during excavation is prevented, and damage is prevented.
[0029]
As shown in FIG. 6, the lower ends of the hydraulic hoses 17c and 17d are arranged on the hydraulic supply side and the hydraulic discharge side, all of which are arranged together along the installation surface between the left and right frames 2 via pipe joints. This is connected to the metal hydraulic tubes 17e and 17f of the book, and finally connected to the metal hydraulic tubes 17g and 17h on the hydraulic pressure supply side and the hydraulic pressure discharge side which are erected inside the rear ends of the left and right frames 2. . The upper ends of these hydraulic tubes 17g and 17h are connected to connection ports of a hydraulic unit (not shown) installed outside the shaft through flexible hydraulic hoses.
[0030]
The piping form of such hydraulic hoses can be adopted because the cylinder tube 5a constituting the characteristic part of the present invention is pivotally attached to the bracket 6 erected from the rear end portion of the frame 2 so as to be in the propulsion direction. This is because it is immovable. That is, the fixing of the cylinder tube 5a leads to the fixing of the hydraulic hoses, and it is possible to avoid exposing the hydraulic piping outside the apparatus as much as possible. As a result, in addition to the above effects, the cylinder rod 5b At the same time, it is possible to minimize the number of hoses that reciprocate. This leads to, for example, a reduction in the number of hydraulic circuits of the control unit installed in the upper part of the drive device, and can contribute to the miniaturization of the unit.
[0031]
That is, as can be understood from the above description, the cylinder tube 5a of the propulsion cylinder 5 does not move in the propulsion direction, and the reciprocation in the same direction is the first and second thrusts fixed to the cylinder rod 5b. Since the transmission members 8a, 8b; 13 are used, the hydraulic supply line is also immovable. Therefore, only a flexible hydraulic hose is used for a small portion of the hydraulic hoses connected to the connection port pipe. This piping can use rigid metal hydraulic tubes, and these hydraulic tubes can be easily arranged in a space that does not interfere with other equipment in the apparatus.
[0032]
Now, the short diameter pipe embedding operation by the propulsion apparatus of the present invention configured as described above will be briefly described. When the small diameter propulsion apparatus 1 is installed in the start shaft A, first, a leading conduit (not shown) is connected. While being mounted on a mounting table (not shown) on the frame 2, the connecting shaft end of the screw conveyor protruding from the rear end of the pipe 2 is connected to the driving shaft of the driving device 16. At this time, the position of the second thrust transmission member 13 engaged with the first thrust transmission members 8a and 8b is the recessed portion 9 formed on the rear end side of the first thrust transmission members 8a and 8b. Positioning and other adjustments are carefully made to align the shaft ends.
[0033]
Next, at the same time as the propulsion cylinder 5 is extended, driving of the driving device 16 is started, and the cutter head provided at the tip of the leading conduit is rotated to start the first excavation. When the propulsion cylinder 5 is fully extended, the driving device 16 is temporarily stopped at that position, and the second thrust transmission member 13 is detached from the recess 9 and formed at the front end portions of the first thrust transmission members 8a and 8b. The recessed portion 9 is engaged. Here, the driving device 15 is driven again to start the second excavation. When the propulsion cylinder 5 is fully extended and the excavation proceeds to a position where the rear end portion of the leading conduit is left in the start shaft A, the driving of the driving device 16 is stopped while the leading conduit remains in the ground. After the propulsion device 1 is disconnected from the leading conduit, the cylinder rod 5b of the propulsion cylinder 5 is contracted and moved back to the original position at a high speed.
[0034]
When this retreat is completed, a small-diameter pipe 3 into which a screw casing (not shown) is inserted is put into the start shaft A, and the screw included in the tip shaft portion of the screw conveyor (not shown) in the screw casing and the tip conduit is installed. After connecting the rear end shaft portion of the conveyor, the buried pipe 3 and the leading conduit are connected and fixed. Prior to the position adjustment of the small-diameter pipe 3 at this time, since the apparatus of this embodiment is a propulsion device for a vinyl pipe, the screw casing push plate 15 was first pushed and pulled to position the screw casing. After that, the small-diameter pipe pressing plate 14 is brought into contact with the rear end of the vinyl pipe.
[0035]
When the screw shaft ends are thus connected and fixed, the second thrust transmission member 13 is engaged with the recessed portion 9 formed at the rear end of the first thrust transmission members 8a and 8b, and the drive device 16 is driven. At the same time, the propulsion cylinder 5 is extended, and the first excavation and the small-diameter pipe 3 are embedded. At this time, the position of the second thrust transmission member 13 engaged with the first thrust transmission members 8a and 8b is formed on the rear end side of the first thrust transmission members 8a and 8b as in the case of the above-described front conduit. This is a concave notch 9.
[0036]
When this connection operation is completed, the propulsion cylinder 5 is extended and simultaneously the drive of the drive device 16 is started. At the same time as the excavation, approximately half of the small-diameter pipe 3 is buried in the ground. When the burying is completed, the driving of the driving device 16 is temporarily stopped, the second thrust transmission member 13 is detached from the recessed portion 9, and formed at the front end portions of the first thrust transmission members 8a and 8b. The recessed portion 9 is engaged. Here, simultaneously with driving the driving device 15, the propulsion cylinder 5 is operated to start the second excavation and burial. When the propulsion cylinder 5 is fully extended and the rear end portion of the small-diameter pipe 3 reaches the excavation start position in the start shaft A, the drive of the drive device 16 is stopped, and the drive shaft of the propulsion device 1 is connected to the small-diameter pipe. In addition to being separated from the rear end shaft portion of the screw conveyor (not shown) inserted into the shaft 3, the propulsion cylinder 5 is contracted at a high speed and returned to the original position.
[0037]
By repeating the above operation, the necessary number of buried pipes 5 are sequentially buried. When the burial of all the buried pipes 5 is completed and the pipe reaches the unillustrated reaching shaft, it is transported from the reaching shaft to the ground by a crane (not shown). In addition, the waste generated during the propulsion is sent to the starting shaft A by the screw conveyor, and is carried out from the shaft A to the ground.
[0038]
7 and 8 show a second embodiment of the present invention. In this embodiment, there are two pairs of propulsion cylinders 5 arranged above and below the left and right frames 2, and as shown in FIG. The first thrust transmission members 8a and 8b are arranged above and below the two propulsion cylinders 5 arranged above and below, and four hydraulic tubes connected to the four hydraulic hose connection ports 6c and 6d. 17a and 17b are all disposed between the upper and lower propulsion cylinders 5. The operating procedure and other configurations of the propulsion device are not substantially different from those of the first embodiment, and the installation position of the propulsion cylinder 5 does not move during the propulsion operation as already described in this embodiment. Therefore, almost all of the hydraulic hoses exposed outside the conventional machine, except for the hydraulic hoses of the driving device 16, are fixedly installed in the apparatus and in a portion where interference with other equipment can be avoided. In particular, not only a narrow work space is effectively used, but also work safety and damage to hydraulic hoses are reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a part of the entire configuration of a small-bore tube propulsion apparatus according to a first embodiment of the present invention.
FIG. 2 is a view taken along the line II in FIG.
FIG. 3 is a front view for explaining an engaged state of first and second thrust transmission members;
FIG. 4 is a side view of a propulsion device showing an arrangement of hydraulic piping applied to the present invention.
FIG. 5 is a plan view of the same.
6 is a view taken along the line II-II in FIG.
FIG. 7 is a side view schematically showing the overall configuration of the small-bore tube propulsion apparatus according to the first embodiment of the present invention.
FIG. 8 is a front view for explaining an engaged state of first and second thrust transmission members and hydraulic piping.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Propulsion apparatus 2 Frame 2a Connecting member 3 Small-diameter pipe 4 Reaction force receiver 5 Propulsion cylinder 5a Cylinder tube 5b Cylinder rod 6 Bracket 7 Pins 8a and 8b Upper and lower first thrust transmission members 8a 'Window portion 8c Rectangular cylindrical body 8d Shaft portion 8e Block 9 Recessed portion 10 Drum roller 11 Pin 12 Brackets 12a, 12b Rolling roller (rolling element)
13 Second thrust transmission member 13a Leg portion 13b Horizontal frame portion 13c Handle 14 Small-diameter tube push plate 14a Ear portion 14b Insertion hole 15 Screw casing push plate 16 Drive devices 17a, 17b Hydraulic tubes 17c, 17d Hydraulic hoses 17e-17h Hydraulic pressure Tube 18 Connecting member 18a Leg insertion hole 18b Bracket 18c Wheel

Claims (7)

It is a propulsion device for a small-diameter pipe burying machine that is installed in a start shaft and embeds a small-diameter pipe into the ground,
At least one propulsion cylinder disposed above each of the pair of left and right frames; a push plate that abuts a rear end surface of the small-diameter pipe and propels the small-diameter pipe by the propulsion force of the propulsion cylinder;
A thrust transmission member that transmits the propulsive force of the propulsion cylinder to the push plate;
The cylinder tube of the propulsion cylinder is fixed to a reaction member installed at the rear end of the frame, and the thrust transmission member is fixed to the piston rod end of the propulsion cylinder,
The thrust transmission member along said longitudinal direction of each propulsion cylinders, and left and right cylinder tube and at least a pair of upper and lower first thrust transmission member arranged at a distance from each other in the vertical direction, the first thrust transmission member And a second thrust transmission member having a configuration capable of engaging with and disengaging from the push plate,
A hydraulic pipe for operating the propulsion cylinder is disposed in a space formed between the cylinder tube and the first thrust transmission member disposed above and below.
A propulsion device for a small-diameter pipe burying machine. It said first thrust transmission member is a plate member having a length substantially equal to the promotion cylinder, substantially equal is set comprising Claim 1 propulsion apparatus according to the outer diameter of the plate width is the cylinder tube. The propulsion device according to claim 1 or 2, wherein one propulsion cylinder is disposed above each of the left and right frames. The propulsion device according to claim 1 or 2, wherein at least two propulsion cylinders are disposed above the left and right frames, respectively. The propulsion device according to any one of claims 1 to 4, wherein a front end portion in a longitudinal direction of the first thrust transmission member includes a rolling element that rolls on the frame. The left and right side edges of the first thrust transmission member have at least a pair of engaging recesses with which the second thrust transmission member is engaged and disengaged, and leg portions with which the second thrust transmission member engages with the engagement recesses. The propulsion device according to any one of claims 1 to 5, comprising a substantially gate-shaped frame body. The propulsion device according to claim 6, wherein the engaging recess is formed at least at both ends in the longitudinal direction of the first thrust transmission member.

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