JP4954830B2 - Add-on device for side hole excavator - Google Patents

Description

  The present invention relates to a horizontal hole excavating machine for embedding small-diameter pipes such as water and sewage pipes and communication cable installation pipes in the ground by a press-fitting propulsion method, and more particularly to a splicing device in a horizontal hole excavating machine using a fume pipe as an embedded pipe.

  Generally, underground piping by the press-fitting propulsion method is constructed by constructing a start shaft and a reaching shaft on the surface of the planned piping line, and by a propulsion jack installed in the start shaft, a drilling head that drills a horizontal hole in the ground by rotating the drilling head It pushes from the rear end side and pushes it into the ground while adding the body and the buried pipe that follows it, thereby forming a pipe line to the reaching shaft (Patent Document 1). And in this construction method, in order to discharge excavated sediment, it is arranged while adding and discharging mud pipes inside the buried pipe, and water is sent to the excavation site by these feed and exhaust mud pipes to make the excavated soil mud. At the same time, it is common to discharge the mud excavated soil from the start shaft side. Further, in addition to the sending and discharging mud pipe, a lubricant supply pipe for sending the lubricant to the excavation site may be similarly installed inside the buried pipe (Patent Document 2).

  In such a press-fitting propulsion method, it is necessary to prevent the excavation reaction conductor from rolling (circumferential rotation) due to the excavation reaction force when performing stable excavation. Therefore, when the buried pipe is a steel pipe, the steel pipes to be added as so-called steel pipe sheath pipes are connected and integrated by welding, and the rotational reaction force of excavation is transmitted to the propulsion jack side through the steel pipe, and the propulsion is transmitted. The jack side receives the rotational reaction force to prevent the drilling conductor from rolling. However, when fume pipes (reinforced concrete pipes) are used as the buried pipes, since the fume pipes are simply connected in a plug-in manner, the rotational reaction force cannot be transmitted via these fume pipes.

  In addition, in the case of a fume tube, it is not possible to secure a large torsional resistance strength in terms of material, and even if the end portions are engaged so that they cannot be rotated relative to each other, cracks occur in the engaging portion when a rotational reaction force is applied. . A synthetic steel pipe in which concrete is centrifugally formed in a steel pipe is also known as an embedded pipe (Patent Document 2), but the cost is high and there are restrictions from the application side.

Therefore, when a fume pipe is conventionally used as the buried pipe, a laser beam path for measuring the propulsion direction is formed as a connecting trunk that is disposed inside the fume pipe and transmits the rotational reaction force of excavation to the propulsion jack side. The steel pipe is integrated with the feed / drain mud pipe and the lubricant supply pipe between the flanges at both ends, and the leading part is connected to the drilling destination conductor side, and the connection is made with the fume pipe as the drilling destination conductor advances. When the trunks are added, a method is adopted in which the flanges of the front and rear connecting trunks joined together by bolts are connected and integrated, and the end portions thereof are held non-rotatable on the propulsion jack side.
JP 2002-129879 A JP 2004-52384 A

  However, the conventional connecting trunk used when the buried pipe is a fume pipe has a precise degree of parallelism and perpendicularity with respect to the axial direction (digging direction) of the flange end surfaces on both sides to be connected to each other in a straight line. It is necessary to set each pipe body and both side flanges with high placement accuracy so that the pipe bodies of the connected connecting trunks are concentric at the flange connecting portion. In addition to being very expensive, there is a problem that it takes time to connect, and the steel pipe and the mud pipe and lubricant supply pipe are integrated, so even if some damage occurs, the whole Therefore, there is a problem that repair and maintenance costs are high.

  In view of the above-mentioned circumstances, the present invention is a simple and inexpensive assembling and manufacturing of a connecting trunk that transmits the rotational reaction force of excavation to the propulsion jack as an extension device in a horizontal hole excavator using a fume pipe as an embedded pipe. In addition, it is an object to provide an apparatus that can easily perform a connecting operation when a connecting trunk is added along with the excavation of a conductor to be excavated and can reduce repair and maintenance costs.

  In order to achieve the above object, the present invention provides the following means.

[1] In a horizontal hole excavating machine in which a fume pipe is added to the rear side of a drilling conductor that pierces the ground by the rotation of the excavation head and is pushed by a propulsion jack installed in the start shaft, the inner side of the fume pipe And connected to the excavation tip conductor side so as not to rotate relative to the excavation tip conductor side, and added to the excavation tip conductor, and a connecting trunk that holds the end portion in the circumferential direction non-rotatable on the propulsion jack side, the front and rear ends of each connecting stem, have a fitted connecting portion connecting the connecting stem between relatively unrotatably by inserting mutual excavation direction, the connecting stem linearly in connection state of each other on the inside A splicing device for a horizontal hole excavator , characterized in that it has an axial space portion that passes through the insertion hole, and the insertion and connection portions are formed at a plurality of locations separated from the excavation center .

  [2] The above-mentioned item 1, wherein a lock pin that penetrates the inserted and connected portion in the connected state so as not to be detached is provided, and that the lock pin is prevented from being pulled out on the inner peripheral side of the fume tube. Add-on device for horizontal excavation machine.

[ 3 ] The splicing device in the horizontal hole excavating machine according to the above item 1 or 2 , wherein the connecting trunk has reinforcing ribs extending substantially along the entire length in the axial direction on the outer peripheral side of the steel pipe constituting the axial space portion.

[4] connection stem, which has a reinforcing rib of the plural rows on the outer peripheral side of the pipe, replenishment apparatus in lateral holes excavator according to item 3, wherein the inserted connecting portions at both ends of the reinforcing ribs is formed .

[ 5 ] At least one reinforcing rib has a hollow frame shape, and one end side of the hollow frame-shaped reinforcing rib constitutes a receiving concave portion of the insertion connecting portion, and the other end side of the insertion connecting portion has the insertion connecting portion. 5. A splicing device in a horizontal hole excavating machine according to item 4 , wherein the insertion convex portion is provided.

[ 6 ] The steel pipe is disposed on the inner side of the fume pipe, the leading portion is connected to the excavation tip conductor side, the pulling steel rod is added and connected as the excavation tip conductor advances, and the pulling steel rod is connected to the connecting trunk. 6. A splicing device in a horizontal hole excavating machine according to any one of the preceding items 1 to 5, wherein a support portion is provided.

[ 7 ] A feed mud pipe arranged inside the fume pipe and added as the excavation target conductor is dug, and an outward projecting edge is formed at the front and rear ends of each feed mud pipe, 7. The horizontal hole excavating machine according to any one of the preceding items 1 to 6 , wherein a positioning flange portion is formed to engage the connecting trunk with outward projecting edge portions on both front and rear sides of the feed / drain mud pipe to position the feed / drain mud pipe. Add-on device.

  According to the invention of [1], the rotational reaction force of excavation applied to the excavation tip conductor is transmitted to the propulsion jack side via the connecting trunk disposed inside the fume pipe, and the rotational reaction force is received on the propulsion jack side. However, when the connecting trunks are added along with the excavation of the conductor to be excavated, the connecting trunks are connected to each other so that they cannot be rotated relative to each other only by inserting the insertion connecting portion in the direction of excavation. In addition to being very easy, the connection stem has a simple structure that does not integrate with other pipes such as a sending and discharging mud pipe. Since it only has to be replaced in some cases, repair and maintenance costs can be reduced.

  Further, since the axial space portions in the connecting trunk are linearly penetrated in a mutually connected state, the axial space portion can be used as a laser beam path for measuring the propulsion direction.

  According to the invention of [2], the connected connecting trunks can be locked with the lock pins so as not to be detached, and in addition, the lock pins cannot be pulled out by the fume tube fitted on the connecting portion. Reaction force transmission is more reliable.

According to the invention of [ 3 ], since the connecting stem has the reinforcing ribs extending over the entire length in the axial direction on the outer peripheral side of the steel pipe constituting the axial space portion, the torsional strength of the connecting stem is increased, The transmission of rotational reaction force by the connecting trunk is enhanced.

According to the invention of [ 4 ], the plurality of reinforcing ribs provided on the outer periphery of the steel pipe of the connection trunk can further increase the torsional strength of the connection trunk and can firmly form the insertion connection portion. In addition, it is desirable that the plurality of reinforcing ribs extend substantially along the entire length of the steel pipe in the axial direction and be provided on the outer periphery of the pipe at intervals in the circumferential direction.

According to the invention of [ 5 ], at least one reinforcing rib of the plurality of reinforcing ribs provided on the outer periphery of the steel pipe of the connecting trunk has a hollow frame shape, so that the torsional strength of the connecting trunk is further increased. In addition, it is possible to easily form the receiving concave portion and the insertion convex portion of the insertion connecting portion by utilizing the shape of both ends of the hollow frame-shaped reinforcing rib.

According to the invention of [ 6 ], since the pulling steel rod is arranged inside the fume pipe, when some abnormality occurs during the excavation, the pulling steel rod is used to make the whole including the excavation tip conductor. The steel rod for pulling back can be easily pulled back to the propulsion jack side, and the steel rod for pulling back can be supported by a support portion provided on the connecting trunk.

According to the invention of [ 7 ], the excavated earth and sand can be muddy and discharged by the feed / drain mud pipe, and each feed / drain mud pipe can be easily attached to each connecting trunk using the outward projecting edges of the front and rear ends. Can be positioned.

  FIG. 1 is a schematic view showing a method for propelling underground pipes by a horizontal hole excavator according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a drilling conductor having a horizontal hole H formed in the underground G, and reference numeral 2 denotes a buried pipe. As a fume pipe, 3 is a connecting trunk disposed inside the fume pipe 2, 4 is also a feed mud pipe, 5 is a propulsion jack installed in the start shaft P, and 6 is installed on the floor. A guide beam irradiator for irradiating a laser beam L, 7 is a connecting pipe interposed between the leading buried pipe 2 and the excavation tip conductor 1, 8 is a water stop pit for preventing water leakage from the lateral hole H, and 9 is the ground An equipment muddy water treatment unit, 10 is also a lubricant supply unit, 11 is an operation panel installed in the vicinity of the start shaft P, 12 is a hydraulic unit, and 13 is a generator.

  In this press-fitting propulsion method, while the fume pipe 2 is added as the excavation head conductor 1 is advanced by the rotation of the excavation head 1a, the rear end side is pushed by the push ring 5b of the propulsion jack 5 and propelled to the underground G. The excavation reaction force is received by the inner wall surface of the start shaft P through the reaction force plate 5c of the propulsion jack 5, but the rotational reaction force of excavation is transmitted to the propulsion jack 5 side through the connecting trunk 3 in the fume pipe 2. And is received by the propulsion jack 5.

  2 is an enlarged vertical side view showing a connecting portion of the fume pipes 2... FIG. 3 is a vertical side view showing an adding operation of the connecting trunks 3. FIG. 4A is a cross-sectional view taken along line XX in FIG. FIG. 4B is a sectional view taken along the line Y-Y in FIG. 3.

  As shown in these figures, on the inner side of the fume pipes 2..., There are two connecting trunks 3 positioned substantially at the center and two on the left and right sides near the lower part, one being the water supply side and the other being the mud drain side. The sludge feed pipes 4 and 4, the lubricant supply pipe 14 located in the upper right part, and the steel bars 15 and 15 for pulling back arranged at right and left at an intermediate height are arranged in parallel along the axial direction of the fume pipe 2. ing. And these pipe bodies 3, 4, 14 and the steel rod 15 all have a unit length corresponding to the fume pipe 2, and each time the fume pipe 2 is added along with the excavation of the excavation tip conductor 1, Immediately before that, each is added and connected.

  The fume tube 2 is fitted in a state in which an annular seal cover 21 projects partly rearward on the outer periphery of the rear end portion. When the fume pipe 2 is added, the gasket 22 is interposed between the rear end face of the existing fume pipe 2 and the front end face of the next-stage fume pipe 2, and the rear projecting portion of the seal cover 21 is provided. By inserting the front end portion of the next-stage fume tube 2 into the inner space, the seal layer 21a attached to the inner periphery of the rearward projecting portion provides a water-tight seal between the seal cover 21 and the outer periphery of the next-order fume tube 2. Stopped.

  As shown in FIG. 2, a collar 71 having a T-shaped cross section is fitted between the front end portion of the leading fume tube 2 and the rear end portion of the connection tube 7. A lubricant injection port 72 connected to the lubricant supply pipe 14 is provided on the peripheral surface of the connection pipe 7. On the other hand, on the propulsion jack 5 side, a supply / discharge mud pipe connection port 52 and a lubricant supply pipe connection port 51 are provided.

  As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the connecting trunk 3 is a frame having a U-shaped cross-section facing downward on the top outer surface side of the steel pipe 31 having the laser light path 30 inside. A hollow frame-shaped reinforcing rib 32 is formed over substantially the entire length by welding the material, and a vertical fin-shaped reinforcing rib 33 is formed over the entire length on the bottom outer surface side of the steel pipe 31 by welding the strip material. Yes. The steel pipe 31 is composed of a pipe main body 31a and a cover member 31b having a C-shaped cross section that is fitted on the outside of the pipe main body 31a. The cover member 31b has a length substantially equal to that of the pipe main body 31a. It is welded and fixed with a slight forward shift. The steel pipe 31 can also be regarded as a pipe having high rigidity, that is, a rigid pipe.

  Then, on the front end side of the upper reinforcing rib 32 in the connecting trunk 3, the insertion convex portion 34 a of the insertion connecting portion 34 is inserted by a short square bar which is partially welded and fixed to the hollow frame. Is formed, and the rear end side of the reinforcing rib 32 constitutes a receiving recess 34b corresponding to the insertion protrusion 34a. Further, the insertion protrusion 34a is provided with a lock hole 16 that is vertically permeable, and the lock pin 17 is engaged with the receiving recess 34b so as to be movable in the vertical direction. The insertion pin 34a can be locked from the receiving recess 34b so as not to be detached by passing the lock pin 17 through the lock hole 16 of the insertion projection 34a in a state where the insertion protrusion 34a of 3 is inserted. Yes. In addition, the lock pin 17 is made impossible to be removed from the through-holes of the reinforcing ribs 32 by increasing the diameter of both ends in order to prevent loss.

  On the other hand, at the front and rear end portions of the lower reinforcing rib 33 in the connecting trunk 3, a positioning flange portion 35 having concave arc portions 35a, 35a on both left and right edges, and a mounting hole 35b provided below the positioning flange portion 35 are provided. The short cylindrical body 36 having the proximal end inserted therein is welded and fixed, and the insertion convex portion 37a of the insertion connecting portion 37 is formed by the round shaft body inserted and fixed to the short cylindrical body 36 on the front end side. At the same time, the rear end side of the reinforcing rib 33 constitutes a receiving concave portion 37b corresponding to the convex portion 37a.

  In order to add and connect such a connecting trunk 3 with the excavation of the excavating conductor 1, the front end of the next connecting trunk 3 is aligned with the rear end of the existing connecting trunk 3, as shown in FIG. The insertion convex portions 34a and 37a of the latter insertion connection portions 34 and 37 are inserted into the receiving concave portions 34b and 37b of the former insertion connection portions 34 and 37, and then inserted into the insertion connection portion 34 side. What is necessary is just to let the lock pin 17 penetrate the lock hole 16 of the insertion convex part 34a. Thereby, the steel pipes 31 and 31 of both the connecting trunks 3 and 3 are formed so that the front projecting portion of the latter cover member 31b is fitted on the rear end portion of the former pipe body 31a where the cover member 31b is not provided. Therefore, the cover member 31b is easily and accurately concentrically connected using the positioning guide 31b as a positioning guide. Further, the lock pin 17 penetrated through the lock hole 16 of the insertion convex portion 34a is prevented from moving upward by the inner peripheral surface of the fume tube 2 approached by adding the fume tube 2 outside thereof. Thereafter, the locked state is maintained.

  As shown in FIGS. 5A and 5B, hook retaining portions 32a each having a pair of openings are provided at two front and rear portions of the upper reinforcing rib 32 of the connecting trunk 3. In addition, when the connecting trunk 3 is carried in and out, the hanging hook of the crane is hooked on the hook hooking portion 32a to be hung. In addition, a U-shaped notch 33a is formed on the lower edge side at two front and rear positions of the lower reinforcing rib 33, and a screw hole 33b is formed at the bottom of each notch 33a. The support frame 18 is screwed to 33a. Further, at both front and rear ends of the steel pipe 31, a pipe receiving piece 38 having a concave arcuate portion 38a facing upward is welded and fixed so as to protrude leftward from the upper part of the pipe 31. The lubricant supply pipe 14 is supported in the fume pipe 2 by 38 and 38.

  As shown in detail in FIGS. 7 (A) and 7 (B), the support frame 18 has an upwardly open U-shaped steel rod at both ends of an arcuate base frame 18a made of a strip that is curved in a substantially semicircular shape. The support portion 18b is integrally formed, and has a screw insertion hole 18c in the central portion which is the lowest position of the arc-shaped base frame 18a, and on both sides sandwiching the screw insertion hole 18c and in the longitudinal direction of the arc-shaped base frame 18a Caster mounting holes 18d and 18d are provided at positions oblique to the angle.

  The support frame body 18 is formed by notching the center part of the arc-shaped base frame 18a to the notch of the reinforcing rib 33 of the connecting trunk 3 in a state in which the top casters 19 and 19 are press-fitted and fixed to the caster mounting holes 18d and 18d from below. The fitting bolt 23 is screwed into the screw hole 33b of the reinforcing rib 33 through the screw insertion hole 18c from below and screwed into the screw hole 33b of the reinforcing rib 33, so that the connection trunk 3 is attached to the connection trunk 3 as shown in FIGS. It is attached in a rib shape, and supports the feed and discharge mud pipes 4 and 4 on both the left and right sides of the arc-shaped base frame 18a, and also supports the two steel bars 15 and 15 for pulling back on the left and right sides with both steel bar support portions 18b and 18b. It is like that. As shown in FIG. 4A, the casters 19 and 19 attached to the support frame 18 receive the weight of the entire arrangement in the fume tube 2 and contact the inner surface of the fume tube 2. It will be.

  As shown in FIG. 8, the feed / discharge mud pipe 4 is formed by welding and fixing large and short cylindrical socket parts 4 b and 4 b to both ends of the pipe body 4 a, and the pipe body 4 a and each socket part on the outer periphery of both ends. It has the outward protrusion edge part 4c comprised by the level | step difference between the base parts of 4b. Thus, in the state where the left and right feeding / discharging mud pipes 4, 4 are supported by the front and rear support frames 18, 18 attached to the connection trunk 3, the positioning flange portions provided at the lower ends of the connection trunk 3. As shown in FIG. 4 (A), the pipe main body 4a of each sending / discharging mud pipe 4 is fitted in the concave arc portions 35a, 35a on the left and right side edges of 35, as shown by phantom lines in FIG. The positioning flange portions 35 and 35 are positioned close to the outward projecting edge portions 4 c and 4 c of the respective feed and discharge mud pipes 4, whereby the both feed and discharge mud pipes 4 and 4 are positioned back and forth with respect to the connecting trunk 3. .

  Further, when the feed / drain mud pipe 4 is added along with the excavation of the excavation tip conductor 1, as shown in FIG. 9, the socket parts 4b, 4b of the front and rear feed mud pipes 4, 4 are placed in the sleep 41. Are inserted and abutted together, whereby both the feed and discharge mud pipes 4 and 4 are liquid-tightly fitted and connected via O-rings 42 and 42 fitted to the sleep 41. The lubricant supply pipe 14 is smaller in diameter than the feed / drain mud pipe 4, but has the same structure as the feed / drain mud pipe 4. This is done in exactly the same way as 4.

  The pullback steel rod 15 is provided with male screws (not shown) at both ends, and when adding with the excavation of the digging tip conductor 1, as shown in FIG. What is necessary is just to screw and connect the edge part of the steel bars 15 and 15 before and behind to the sleeve 24. FIG.

  The connection trunk 3, the supply / discharge mud pipe 4, and the lubricant supply pipe 14 are connected to the excavation destination conductor 1 side and the propulsion jack 5 side by using a connection structure in the mutual addition. That is, in the connection trunk 3, the insertion structure of the insertion convex portions 34a, 37a of the insertion connection portions 34, 37 and the receiving concave portions 34b, 37b, and the insertion and insertion using the socket portion in the supply / discharge mud tube 4 and the lubricant supply tube Using the structure, the connection pipe 7 is provided with a connection portion corresponding to the rear end side of each member on the excavation tip conductor 1 side, while the connection portion corresponding to the front end side of each member is provided on the propulsion jack 5 side. What is necessary is just to perform a connection operation similarly to the time of addition. As shown in FIG. 2, the pulling steel rod 15 is screwed and connected to the nut member 25 on the connection pipe 7 side and the nut member 53 on the propulsion jack 5 side.

  According to the splicing device of the horizontal hole excavator having the above-described configuration, the rotational reaction force of excavation applied to the excavation tip conductor 1 by the rotation of the excavation head 1a is propelled via the connecting trunk 3 disposed inside the fume pipe 2. The rolling is prevented by receiving the rotational reaction force on the propulsion jack 5 side. Thus, when the connecting trunk 3 is added along with the excavation of the digging tip conductor 1, the connecting trunks 3 and 3 are connected to each other so that they cannot be rotated relative to each other simply by inserting the insertion connecting portions 34 and 37 in the excavating direction. In addition, the connecting work of the connecting trunks 3 and 3 is very easy, and the connected connecting trunks 3 and 3 are locked so as not to be detached by the lock pins 17 at the insertion fitting portions 34 and are externally fitted. Thus, the lock pin 17 cannot be pulled out, so that the transmission of the excavation reaction force by the connecting trunks 3 becomes more reliable.

  In addition, the connecting trunk 3 has a structure in which the steel pipe 31 that uses the inside as the laser beam path 30 for measuring the propulsion direction is covered with the cover material 31b on the pipe body 31a and has high rigidity. Reinforcement ribs 32 and 33 are provided at the top and bottom, and the reinforcement rib 32 at the top forms a hollow frame. Therefore, the torsional resistance is extremely high, and the transmission performance of the rotational reaction force is excellent. It leads to.

  Further, the connecting trunk 3 has a simple structure independent of the feed / drain mud pipe 4 and the lubricant supply pipe 14, and the both ends of the hollow frame-shaped reinforcing rib 32 are inserted into the insertion protrusions 34 a of the insertion connection part 34 and In addition to being able to assemble and manufacture the connecting trunk 3 at a low cost because it is used for the receiving recess 34b, it can be replaced if it itself is damaged. And maintenance costs are significantly reduced.

  Further, since the pulling steel rods 15 are arranged inside the fume pipes 2..., When the abnormality occurs during excavation, the pulling steel rods 15. It can be easily pulled back to the jack 5 side.

  On the other hand, it is possible to support the supply / discharge mud pipes 4 and 4 and the steel rods 15 and 15 for withdrawal using the support frame bodies 18 and 18 of the connecting trunk 3, and also to support the lubricant supply pipe 14 by the pipe receiving pieces 38 and 38. In addition, since the feeding and discharging mud pipes 4 and 4 can be positioned in the front-rear direction, when the pipes are carried from the ground into the start shaft P for addition, the feeding and discharging mud pipes 4 and 4 are previously connected to the connecting trunk 3 on the ground. 4 and steel rods 15 and 15 for pulling back and lubricant supply pipe 14 are supported, and the whole is lowered as a single unit onto the propulsion jack 5 with a crane or the like, so that each member can be easily placed in an appropriate connection position. Can perform concatenation operations.

  As mentioned above, although this invention was demonstrated based on embodiment, it cannot be overemphasized that this invention is not limited above, In the range which does not change the meaning, you may change variously.

It is the schematic which shows the press injection propulsion method by the horizontal hole excavation machine which concerns on one Embodiment of this invention. It is a vertical side view which expands and shows the fume pipe | tube connection part of the horizontal hole excavation machine. It is a vertical side view which shows the connection trunk addition operation in the horizontal hole excavation machine. The longitudinal cross-section of a fume pipe | tube arrangement | positioning part is shown, (A) is a cross-sectional view of the XX line of FIG. 3, (B) is a cross-sectional view of the YY line of FIG. The connection trunk | frame used for the same horizontal hole excavation machine is shown, (A) is a top view, (B) is a partially broken side view. The connection trunk is shown, (A) is a front view of the rear end side, (B) is a cross-sectional view taken along the line ZZ in FIG. 5 (B). The support frame used for the horizontal hole excavation machine is shown, (A) is a plan view and (B) is a front view. It is a vertical side view of the sending and discharging mud pipe used for the horizontal hole excavating machine. It is a vertical side view of the connection part of the same discharge mud pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling destination conductor 1a Drilling head 2 Hume pipe 3 Connection trunk 30 Laser optical path (space part in axial direction)
31 Steel pipe 32 Reinforcement rib (hollow frame-shaped reinforcement rib)
33 Reinforcement rib 34 Insertion connection part 34a Insertion convex part 34b Receiving recessed part 35 Positioning flange part 37 Insertion connection part 37a Insertion convex part 37b Receiving recessed part 4 Feeding / discharging mud pipe 4c Outward protruding edge part 5 Propulsion jack 15 Steel rod for pulling back 17 Lock pin 18 Bearing frame (bearing part)
G Ground H Side hole P Starting shaft

Claims (7)

In the horizontal hole excavator that pushes them with a propulsion jack installed in the start shaft while adding a fume pipe to the rear side of the drilling conductor that drills a horizontal hole in the ground by the rotation of the excavation head,
Arranged inside the fume pipe, the leading end is connected to the excavation tip conductor side so as not to rotate relative to the excavation tip conductor, and is added as the excavation tip conductor advances, and the end portion is held non-rotatable on the propulsion jack side. With a connecting trunk,
The front and rear ends of each connecting stem, have a fitted connecting portion connecting the connecting stem between relatively unrotatably by inserting mutual excavation direction,
The connection trunk has an axial space portion that linearly penetrates in a mutually connected state on the inner side, and the insertion connection portion is formed at a plurality of locations separated from the excavation center . Add-on device for side hole excavator.   The lock pin which penetrates the said insertion fitting connection part of a connection state so that it cannot detach | leave, and is comprised so that extraction operation | movement of this lock pin may be prevented on the inner peripheral side of the said fume pipe | tube. Add-on device for side hole excavator. The said connection trunk | drum is a splicing apparatus in the horizontal hole excavation machine of Claim 1 or 2 which has a reinforcing rib covering the axial direction substantially full length in the outer peripheral side of the steel pipe which comprises the said axial direction space part. The splicing device in the horizontal hole excavation machine according to claim 3 , wherein the connecting trunk has a plurality of reinforcing ribs on an outer peripheral side of the pipe, and the insertion connecting portions are formed at both ends of the reinforcing ribs. At least one reinforcing rib has a hollow frame shape, and one end side of the hollow frame-shaped reinforcing rib constitutes a receiving concave portion of the insertion connecting portion, and an insertion convex portion of the insertion connecting portion on the other end side. The splicing device in the horizontal hole excavating machine according to claim 4 , wherein: The steel pipe is disposed inside the fume pipe and connected to the excavation tip conductor side, and has a pullback steel rod that is added and connected as the excavation tip conductor advances, and a support portion for the pullback steel rod on the connection stem. The splicing device in the horizontal hole excavation machine according to any one of claims 1 to 5 , wherein A mud pipe that is arranged inside the fume pipe and is added as the drilling conductor is advanced,
Outward protruding edges are formed at the front and rear end portions of each feeding / draining mud pipe, and the feeding / discharging mud pipe is positioned by engaging with the outward protruding edges on both the front and rear sides of the feeding / draining mud pipe to the connecting trunk. The adding device in the horizontal hole excavation machine according to any one of claims 1 to 6 , wherein a positioning flange portion is formed.

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