JP4474671B2 - Equipment for drawing and crushing buried pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when replacing old pipes such as gray cast iron pipes and ductile cast iron pipes or plastic pipes buried in the ground with new pipes, the old pipes buried without excavation are replaced with the shaft side. And a drawing crushing apparatus for crushing old pipes in parallel with the drawing.
[0002]
[Prior art]
In recent years, especially in urban areas, buried pipes such as gas pipes and sewage pipes that have been laid in the past have been gradually replaced with new pipes due to reasons such as the lack of supply capacity. In particular, in the field of gas pipe maintenance business, replacement of cast iron gas pipes laid in the past with safe polyethylene pipes (hereinafter referred to as PE pipes) is actively performed.
[0003]
Conventionally, for this type of pipe replacement, methods such as laying replacement by excavation and insertion of PE pipes into existing pipes have been adopted. However, the former method of exchanging pipes by excavation requires excavation along the buried pipe laying line, and is a method that is difficult to adopt year by year due to traffic conditions in urban areas, the complexity of buried structures and the situation of occupation on the ground. It is becoming. On the other hand, the latter PE pipe insertion method requires that the outer diameter of the new pipe is smaller than the inner diameter of the existing pipe, so it can be used in cases where at least a supply capacity that exceeds the current level must be secured. There were problems such as very limited application cases.
[0004]
In recent years, what is attracting attention as a method that can update existing pipes while solving these problems is the so-called non-cutting method called pipe cracking method, pipe splitter method, refresh shield method, replacement propulsion method, etc. This is a method for updating tubes. The pipe cracking method is a method in which a new pipe is inserted after the existing pipe is crushed by forcibly passing through a crushing cone having a diameter larger than the inner diameter of the existing pipe, and then the new pipe is inserted. A cutting machine with a polyethylene pipe connected to the rear end of the pipe is pulled into the pipe, and cut into the upper, lower, left, and right in the existing pipe, and then spread outward to divide it into four parts. This is a method of laying pipes. On the other hand, in the refresh shield method and the replacement propulsion method, the existing pipe is sequentially inserted behind the existing pipe while cutting and crushing the existing pipe with a shield excavator.
[0005]
However, in the case of the pipe cracking method and the pipe splitter method, since all the fragments of the old pipe remain in the ground, it is necessary to obtain administrative permission. There is a problem that the surface of the pipe is damaged by a fragment of the existing pipe. On the other hand, in the case of the refresh shield method and the replacement propulsion method, the manufacturing cost and the maintenance cost of the shield machine increase, so the construction cost becomes expensive. There was a problem such as.
[0006]
On the other hand, the applicant described in the above Japanese Patent Publication No. 2-55676, “After exposing both ends of the buried pipe, while pressing with an impact type propulsion device from one side of the buried pipe, We proposed a method for renewing the pipe by non-cutting, in which the impact type propulsion device was pulled with a winch from the other end of the tube to push the buried tube forward, and the buried tube was pushed out and moved from the buried portion. According to this pipe renewal method, since vibration due to impact is added from simple equipment, the buried pipe can be easily pushed out and updated to a new pipe having a larger diameter than the old pipe. be able to. Furthermore, effects such as the construction speed being extremely faster than other methods can be obtained.
[0007]
[Problems to be solved by the invention]
However, in the case of the method described in JP-B-2-55676, the pulling-out force of the buried pipe is used as the self-propulsion force and the winch of the impact-type propulsion device using the frictional force with the peripheral wall. When the ground has a large frictional force between the buried pipe and the ground, such as clay or silt layer, the winch can give enough pulling force to move the buried pipe. Inability to do so may result in temporary interruption of work due to replacement with a winch having a large retractability. Further, in this publication, since the pulled buried pipe is sequentially cut and removed, there is a problem that the work is not efficient because it takes time and labor for cutting.
[0008]
On the other hand, cast iron pipes buried for gas supply have many outer diameters equivalent to the straight pipe part as joints, and many thick stamped or flange type joints are used. When the pipe is pulled out, the joint removal process that appears for each unit gas pipe length (L≈3 m) becomes a problem.
[0009]
Under such circumstances, one of the applicants of the present application, in the prior Japanese Patent Application No. 10-243001, reliably pulls out the buried pipe to one shaft side and sequentially crushes the drawn buried pipe. In this way, we proposed a pulling and crushing device for buried pipes that enabled efficient construction. In this drawing and crushing device, when pulling the buried pipe, either a tensile steel bar or a tensile steel wire can be used as the tensile steel, but in the case of a tensile steel bar, Although there is a merit that there is little elongation even if tension is applied, it is necessary to pass through the buried pipe while connecting each one, and further, it is forced to work while disconnecting the connection coupler at the time of recovery. However, there was a problem that it was not efficient. Therefore, when emphasizing work efficiency, a tensile steel wire is used, but in the case of a tensile steel wire, an elongation of 3.4% or more occurs depending on the tensile load. For example, when 50 m of the buried pipe is removed, there is a possibility that 1.70 m of elongation occurs in the buried pipe. For this reason, the pulling and crushing device is provided with a holding chuck and a pulling chuck, and pulling is performed while constantly applying tension to the tensile steel wire, that is, sequentially changing the tensile load between the holding chuck and the pulling chuck. However, it is desired to develop a chuck portion structure capable of efficiently changing the tensile load between the holding chuck and the traction chuck.
[0010]
Therefore, the main problem of the present invention is to reliably pull out the buried pipe to one shaft side regardless of the soil properties, that is, the frictional force, and to sequentially break the drawn buried pipe, It is possible to efficiently replace the tensile load of the tube and realize continuous construction, and to make the embedded pipe that can be easily crushed for the joint part that appears for each unit buried pipe length. It is in providing a drawing crushing apparatus.
[0011]
[Means for Solving the Problems]
The present invention for solving the above problems is a bearing frame in which a passage hole portion through which a buried pipe passes is formed in a substantially central portion;
A pair of left and right pull-in jacks, the bottoms of which are connected and fixed to both ends of the bearing frame, and arranged in parallel along the direction of the buried pipe;
The head positions of these pull-in jacks are connected to each other, and the supporting frame is provided with a holding chuck means in which the crushing head is fixed to the side surface of the flange, and the tensile steel wire can be arbitrarily restrained and released. A fixed frame;
It is connected and fixed between the piston heads of the pull-in jack, and is composed of a pull-in frame provided with pulling chuck means that can arbitrarily restrain and release the tensile steel wire,
Each of the holding chuck means and the traction chuck means is fitted into the conical space, and a sleeve in which the tensile steel wire is inserted and a conical space in which the inner diameter is gradually narrowed in the anti-pulling direction is formed in the insertion portion. A collet that chucks the tensile steel wire by a wedge action, a spring member that biases and holds the collet in the anti-pulling direction, and is disposed at a facing position on the urging direction side of the collet and moves the collet in the pulling direction by a piston operation. It is characterized by comprising a chuck release cylinder that releases the restraint of the tensile steel wire rod by the extruded collet.
[0012]
In the present invention, since the tensile steel wire is pulled by the pulling force of the pulling jack, a large pulling force can be obtained, even if the friction between the buried pipe and the ground is large. The buried pipe can be reliably pulled in and transported, and a crushing head is provided on the fixed frame that connects the jacks for drawing in. Removal can be performed efficiently.
[0013]
In addition, since the holding frame is provided with the holding chuck means on the fixed frame, and the pulling frame is provided with the traction chuck means, and the structure of the holding chuck means and the traction chuck means is the above-described structure. In addition, the replacement of the tensile load can be performed reliably and efficiently, and the pulling can be continuously performed.
[0014]
Next, in the drawing and crushing apparatus, in order to easily crush the joint portion appearing for each unit buried pipe length, it is supported by a traveling wheel and disposed on the left and right sides along the buried pipe direction. A base body that is movable along the travel guide member, and a wheel holding member that holds the travel wheels is elastically biased and supported toward the travel guide member side;
A crushing base suspended by and supported by the base body;
A crushing jack attached to the base and provided with crushing teeth at a piston tip, and a crushing device for crushing a joint portion of a pipe located between the crushing base and the crushing jack. To do. By using this joint crushing apparatus, it becomes possible to easily and quickly crush the pipe joints that appear at every predetermined drawing length.
[0015]
In such a joint crushing device, the base is supported by a traveling wheel that travels on a traveling guide member, and the wheel holding member that holds the traveling wheel is elastically biased and supported toward the traveling guide member side. ing. As a result, there is a gap between the joint lower edge and the crushing pedestal at the time of destruction by the crushing jack, so even if the joint crushing device itself is lifted up reactionally, the wheel moves downward. Thus, since the state in contact with the travel guide member is maintained, it is possible to prevent the wheel from being removed.
[0016]
According to this device, the buried old pipe is completely pulled out and removed, so there is no residue left in the ground like the pipe cracking method and pipe splitter method described above, and after the old pipe is drawn and removed. Since the new pipe is inserted into the hole, the new pipe is prevented from being damaged. In addition, since a hole corresponding to the outer diameter of the large joint part is formed in the ground, it is possible to easily increase the size of the pipe compared to the old pipe. Of course, since the old pipe is crushed simultaneously with the drawing, an efficient construction can be realized.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0018]
First, in order to understand the method of using the buried pipe drawing / crushing apparatus 1 according to the present invention, a method for renewing a pipe using this will be described in detail with reference to FIGS. 10 and 11 are work procedure diagrams of a gas pipe renewal method (cast iron pipe to PE pipe) using the buried pipe drawing and crushing apparatus 1 (hereinafter simply referred to as a drawing and crushing apparatus).
[0019]
As a preparatory work, as shown in FIG. 10 (A), in order to expose the buried gas pipe 2 with a predetermined separation with respect to the direction of the buried gas pipe 2, for example, a distance of about 30 to 50 m as one construction section length. The starting pit A and the reaching pit B are formed respectively by digging the ground. The start pit A is a vertical shaft for sending out the impulsive propulsion unit 3 and the PE pipe 5 and the grout injection pipe 10 that follow the impact type propulsion machine 3, while the arrival mine B is pulled out by installing the drawing crushing device 1. This is a shaft for sequentially crushing the gas pipe 2. Further, one end of a tensile steel wire 21 such as a PC steel strand inserted between the start pit A and the arrival mine B through the buried gas pipe 2 is coupled to the head of the impact propulsion unit 3. The other end is restrained and held by the drawing crushing device 1.
[0020]
The impact type propulsion device 3 includes an impact type vibration oscillator that applies impact vibration to the buried gas pipe 2 in order to cut off friction between the buried gas pipe 2 and the surrounding ground, and is a compressor mounted on the work vehicle 7. It is driven by compressed air sent from The impact propulsion unit 3 may optionally include a self-propelled mechanism that penetrates the ground and self-runs by using a frictional force with the surrounding ground as a reaction force. A dummy pipe 4 is connected to the rear part of the impact-type propulsion unit 3 for protecting the hole wall and connecting the tip of the PE pipe 5 newly laid.
[0021]
On the other hand, the work vehicle 6 stopped near the reaching pit B is filled with a grout material after inserting a hydraulic unit for supplying pressure oil as a drive source to the drawing crushing apparatus 1 and a PE pipe. A grout material mixer and grout pump are installed, and a service pipe for supplying gas to individual residences is connected between the start pit A and the arrival pit B to a newly laid pipe Therefore, connection work shafts 8A and 8B are dug in advance.
[0022]
When this preparatory work is completed, the buried gas pipe 2 is slowly pulled out to the arrival mine B side by pulling the impact type propulsion device 3 through the tensile steel wire 21 by jack operation of the drawing crushing apparatus 1. In the reaching pit B, the drawn gas pipes 2 are sequentially crushed, and the joints 2a, 2a,... Appearing for each unit gas pipe length are crushed by the joint crushing apparatus 13 attached to the drawing crushing apparatus 1. The required pulling force by the drawing and crushing device 1 is substantially equivalent to the outer diameter of the joint 2a over the entire buried section of the buried gas pipe 2 after the large diameter joint 2a has moved by the unit gas pipe length. Since the hole to be formed is formed, the subsequent pulling force can be extremely small.
[0023]
After that, as shown in FIGS. 10B and 10C, when the impact type propulsion unit 3 reaches the access shaft B, the impact type propulsion unit 3 and the dummy pipe 4 are removed, and then the drawing crushing device 1 is changed. As shown in FIG. 11D, after the airtight test of the newly installed PE pipe 5 is performed, both ends of the PE pipe 5 are connected to the existing gas pipes 2 and 2, respectively, and the service pipe 9 Is connected to the PE pipe 5. Next, as shown in FIG. 11 (E), after discharging the grout material from the tip of the grout injection pipe 10, the grout injection pipe 10 is pulled out to the arrival shaft B side, and the cavity around the PE pipe 5 is filled. Then, the start pit A and the arrival mine B are backfilled to complete the update of the pipe for the update target section.
[0024]
Hereinafter, the drawing crushing apparatus 1 installed in the reaching mine B will be described in detail based on FIGS. 1 is a side view of the drawing crushing apparatus 1, FIG. 2 is a plan view, and FIG. 3 is a front view.
[0025]
As can be seen from the tube renewal operation procedure described above, the function of the drawing crushing device 1 is to pull the impact type propulsion device 3 through the tensile steel wire 21 and to crush the drawn gas pipe 2 sequentially. The joint crushing function for crushing the joints 2a, 2a,... Appearing for each unit gas pipe length is provided.
[0026]
As shown in FIG. 1, the drawing and crushing device 1 is installed in a state where it is suspended by suspension steel materials 11, 11 for the purpose of facilitating the alignment with respect to the buried gas pipe 2, etc. The
[0027]
The drawing crushing device 1 is in contact with the wall surface of the reaching pit B, and has bottom portions at both ends of the side surface of the bearing frame 14 in which at least a passage hole 33 portion through which the buried gas pipe 2 passes is formed in the center portion. A pair of left and right pull-in jacks 15A and 15B are connected and fixed, and the front portions (cylinder heads) of the pull-in jacks 15A and 15B are connected to each other, and the supporting frame 14 is attached to the lateral side of the flange. A pulling and crushing device main body including a pulling crushing device 19 provided with a pulling frame 19 including a fixed frame 16 having a crushing head 17 and being connected and fixed between the pistons 18A and 18B of the pulling jacks 15A and 15B. Towing and crushing device 12 having a function of sequentially crushing the drawn gas pipe while towing,
Fittings 2a, 2a that are horizontally mounted between square tube rails 20A, 20B having a rhombus cross section disposed on the upper surface side of the retraction jacks 15A, 15B, are movable in the rail direction, and appear for each unit gas pipe length. It is an apparatus comprised from the joint crushing apparatus 13 for crushing.
[0028]
In more detail below,
The supporting frame 14 is a supporting plate having a built-up structure in which the front wall plate 30 and the rear wall plate 31 are connected by a plurality of connecting plates 32a, 32b, 32c... A passage hole 33 through which the gas pipe 2 passes is formed. Moreover, suspension pieces 34 and 34 for suspending the pulling and crushing device 1 are fixed on the upper surface.
[0029]
On both sides of the rear wall plate 31, horizontal jacks 15A and 15B having a bottom portion connected and fixed are fixed, and the head portions of the two jacks 15A and 15B are connected to each other by a fixed frame 16. Has been.
[0030]
This fixed frame 16 has a built-up structure in which a front wall plate 35 and a rear wall plate 36 are connected by a plurality of connecting plates 37, 37, etc., as in the case of the bearing frame 14. The holding chuck means 38 for temporarily holding the tensile steel wire 21 so as not to loosen when the grip of the tensile steel wire 21 by the drawing frame 19 is replaced every stroke during the drawing operation of the buried gas pipe 2. I have.
[0031]
Further, the crushing head 17 fixed toward the support frame 14 side with respect to the center of the front wall plate 35 has crushing blades 17a provided on both sides so that the outer diameter increases toward the base side. 17 b is provided, and the embedded gas pipe 2 is crushed so that the crushing blades 17 a, 17 b are expanded from the inner wall side by drawing the buried gas pipe 2. A through-hole 17c for penetrating the tensile steel wire 21 is formed at the center of the crushing head 17, and the tensile steel wire 21 passes through the through-hole 17c and further passes through the holding chuck means 38 to be described later. The pulling chuck means 45 provided on the retracting frame 19 is restrained and held.
[0032]
The retraction frame 19 connected to the piston heads 18A, 18B of the retraction jacks 15A, 15B has a predetermined separation by interposing connection plates 42, 43 ... between the upper plate 39 and the lower plate 40, By inserting the head connecting portions 41, 41 of the pistons 18A, 18B between the upper and lower plates 39, 40 and inserting connecting pins 44, 44 penetrating the upper and lower plates 39, 40 and the head connecting portion 41 together. It is connected. Further, a pulling chuck means 45 for gripping the tensile steel wire 21 is fixed inside the substantially center of the upper and lower plates 39, 40, and the tensile steel wire inserted through a through hole 42a formed in the connecting plate 42. 21 is restrained and held when retracted, and the restraint of the tensile steel wire 21 can be temporarily released when the grip is replaced.
[0033]
The holding chuck means 38 provided on the fixed frame 16 and the traction chuck means 45 provided on the retracting frame 19 can be easily and continuously switched between restraining and releasing the tensile steel wire 21. As shown in FIG. 8A, the structure includes a sleeve 73 in which the tensile steel wire 21 is inserted and a conical space 73a in which the inner diameter is gradually narrowed in the anti-pulling direction, and the cone. The collet 74 is formed of a plurality of split member pieces that are inserted so as to sandwich the tensile steel wire 21 in the space 73 a and chuck the tensile steel wire 21 by a wedge action, and the tensile steel wire 21 penetrates the bottom surface side of the collet 74. A cylindrical indicator member 75 provided in a state of being attached to the bottom surface of the collet 74. A spring member 76 that urges the collet 74 in the anti-pulling direction by an elastic force, and a position facing the sleeve 73 (collet 74). By pushing the collet 74 in the pulling direction by a piston operation, the collet 74 The chuck release cylinder 77 is configured to release the restraint of the tensile steel wire 21. In the chuck release cylinder 77, the tensile steel wire 21 is inserted through a hollow portion of a cylindrical piston 78 that reciprocates in the direction of the tensile steel wire 21, and when the tensile steel wire 21 is chucked by the collet 74, FIG. As shown in (), it is localized in the direction opposite to the pull-out direction. Further, when releasing the chuck of the tensile steel wire 21 by the collet 74, as shown in FIG. 8B, the collet 74 is extruded in the drawing direction side to release the chuck of the tensile steel wire 21. Proximity switches 79a and 79b that detect the position of the cylindrical piston 78 and determine whether the tension steel wire 21 is in the released state or the tension steel wire 21 is in the restrained state on the chuck releasing cylinder 77 portion. Are provided. The signals from the proximity switches 79a and 79b pass through signal processors (not shown), respectively, and, as shown in FIG. 2, are restrained or released by indicator lamps 81 and 82 provided adjacent to the chuck means 38 and 45. Something is visually displayed by a lamp. In addition, for double confirmation, a viewing window 80 is provided at a site adjacent to the indicator member 75 so that when the chuck is released, the presence of the indicator member 75 can be confirmed to check whether the indicator member 75 is in a restrained state or a released state.
[0034]
On the other hand, on the upper surface side of the retraction jacks 15A and 15B, square tube rails 20A and 20B having a rhombus cross section are arranged, respectively, and a joint crushing device 13 that is movable along the square tube rails 20A and 20B is provided. Is provided.
[0035]
As shown in FIGS. 4 to 6, the joint crushing device 13 includes four support arm members 54 </ b> A to 54 </ b> D on both side surfaces of the base body 50, and tip shaft portions 55 a of the respective support arm members 54 </ b> A to 54 </ b> D. With respect to .about.55d, a wheel leg 56 on which a roller 57 is pivotally supported at the tip end portion is rotatably supported. These wheel legs 56, 56... Are respectively provided on the front and rear surfaces of the base body 50, and collide with stopper members 53A, 53B arranged over the square tube rails 20A, 20B in a plan view. The leg angle is regulated. Further, the wheel legs 56 and 56 on the square tube rails 20 </ b> A and 20 </ b> B are connected to each other by a spring member 59 in order to urge the wheel legs 56 downward.
[0036]
That is, the wheel leg 56 is constituted by a pair of two side plates 56a and 56b, and a connecting plate 58 having a through hole is fixed inside the side plates 56a and 56b. Each of the screw members 60 is connected, the screw members 60 are inserted through the through holes of the connecting plate 58, and the nut 61 is screwed to fix the spring member 59 with the connecting plate 58 as a fixing seat. In this example, the pair of wheel legs 56, 56 on the square tube rails 20A, 20B are connected to each other by the spring member 59, but each wheel leg 56 is individually urged downward. Alternatively, instead of urging the wheel leg 56 in the rotation direction, for example, by disposing a spring member between a roller holder that rotatably supports the roller 57 and a support member, The roller holder may be urged directly downward. The reason why each wheel leg 56 is biased downward will be described in the section of the joint section crushing procedure at the subsequent stage.
[0037]
On the other hand, a crushing jack 51 is provided on the upper surface side of the base body 40, and suspension bolts 52A and 52B are suspended from both ends of the lower surface side, respectively, and nuts screwed to the tips of the suspension bolts 52A and 52B are provided. A crushing pedestal 62 is placed horizontally. Further, the piston head of the crushing jack 51 is connected to a lifting block 63 in which a recessed groove on a side portion is fitted to the suspension bolts 52A and 52B and can be moved up and down along the suspension bolts 52A and 52B. And the crushing tooth | gear 64 which crushes the coupling 2a of the gas pipe 2 is being fixed to the lower part of this raising / lowering block 63. As shown in FIG.
[0038]
The booster 65 placed on the stopper members 53A and 53B is for controlling the hydraulic pressure of the crushing jack 51, and the crushing blade 64 contacts the gas pipe joint 2a by lowering the lifting block 63. Until this is done, control is performed with emphasis on the stroke speed, and the hydraulic pressure is controlled so that control is performed with emphasis on the press pressure from after contact until crushing.
[0039]
By the way, a stroke sensor mechanism is incorporated in one side of the square tube rails 20A and 20B, in the illustrated example, in order to manage the stroke of the pull-in jacks 15A and 15B.
[0040]
As shown in FIG. 7, the rod guide 66 is fixed to the mouth of the square tube rail 20 </ b> B, and one end is connected to the retracting frame 19 via the connecting member 71 and moves in conjunction with the movement of the retracting frame 19. The rod 67 is inserted into the square tube rail 20B through the rod guide 66, and a abacus ball-shaped moving block 68 is fixed to the tip of the stroke rod 67, while the bottom position and the outside of the square tube rail 20B are fixed. Limit switches 69 and 70 are fixed to the respective head positions, and the contact beam projecting outside from each of the limit switches 69 and 70 is exposed to the inside of the cylinder from the windows 20a and 20b of the square tube rail 20B, and the moving block The stroke positions of the retracting jacks 15A and 15B are detected by contact between the contact beam 68 and the contact beam. . In addition, 72 is a cover material which covers a limit switch part.
[0041]
In order to draw and crush the buried gas pipe 2 sequentially using the drawing and crushing apparatus 1 described in detail above, first, the drawing and crushing apparatus 1 is set in the state shown in FIG. 1, and as shown in FIG. 9 (A). The tensile steel wire 21 is restrained and held by the pulling chuck means 45 on the drawing frame 19 side, and is released on the holding chuck means 38 side, and the drawing jacks 15A and 15B are extended to draw the tensile steel wire 21. The buried gas pipe 2 is drawn by drawing the tensile steel wire 21, and the gas pipe 2 is crushed by pressing against the crushing head 17. The crushing glass falls as it is, and slides down a chute 90 disposed immediately below and accumulates in a predetermined place.
[0042]
As shown in FIG. 9 (B), if the gas pipe 2 is crushed by the drawing of the tensile steel wire 21 over one stroke length of the drawing jacks 15A and 15B, the tensile steel wire 21 is drawn by the drawing frame 19. The tensile load is changed to the holding chuck means 38 side of the fixed frame 16. First, as shown in FIG. 9C, on the holding chuck means 38 side, the collet 74 that has been moved to the drawing direction side by the chuck release cylinder 77 is returned to the counter drawing direction side, and the tensile steel wire 21 is moved by the collet 74. Chuck. At that time, the proximity switch 81 on the holding chuck means 38 side is turned on. Next, by mechanically relieving the hydraulic pressure of the pull-in jacks 15A and 15B, the elongation of the tensile steel wire 21 contracts, and the collet 74 is reliably pulled into the back side of the sleeve 73 along with the contraction, and the load is increased. Refilling is performed on the holding chuck means 38 side. After that, on the traction chuck means 45 side, the chuck release cylinder 77 moves the collet 74 in the drawing direction side against the elastic force of the spring member 76 to completely release the chuck of the tensile steel wire 21. The collet movement is confirmed by the indicator lamp 82.
[0043]
When the load refilling procedure so far is completed, the retracting jacks 15A and 15B are contracted as shown in FIG.
[0044]
Next, in order to transfer the load held by the holding chuck means 38 again to the traction chuck means 45 side on the drawing frame 19 side, first, on the traction chuck 45 side, the return of the chuck release cylinder 77 is confirmed by the indicator lamp 82. After that, the pull-out jacks 15A and 15B are pulled out so that the collet 74 pushed by the spring member 76 is gradually bitten following the pull-in of the tensile steel wire 21, and the load is refilled. If retraction by the retraction jacks 15A and 15B is started, a little later (around 1 second), the collet 74 is pushed out by the chuck release cylinder 77 on the holding chuck 38 side, and the chuck of the tensile steel wire 21 is completely released. Thereafter, the pulling jacks 15 </ b> A and 15 </ b> B are extended to repeatedly pull the tensile steel wire 21 and crush the gas pipe 2 continuously.
[0045]
The refilling of these tensile steel wires 21 can be performed manually, but in this chuck structure, the collet 74 is biased in the anti-pulling direction by the spring member 76, and the restraint releasing means ( Since the chuck release cylinder 77) is provided, the tension steel wire 21 can be easily restrained and released only by the hydraulic operation of the chuck release cylinder 77. Accordingly, each hydraulic circuit is connected to the proximity switch 79a, Automation can be easily performed by controlling the sequencer using the detection signal 79b. Further, in the case of automation, as an interlock mechanism, when the operation stop button is pressed during automatic operation, if a load is received on the traction chuck means 45 side, the load is always refilled on the holding chuck means 38 side in the initial state. It is desirable that the chuck release cylinder 77 is not advanced (released) simultaneously on both the holding chuck means 38 and the traction chuck means 45 side.
[0046]
By the way, when the joint 2a of the gas pipe 2 appears for each unit length at the time of pulling and crushing the buried pipe 2, the joint crushing device 13 is used to destroy the joint 2a.
[0047]
If the joint 2a is located in the space surrounded by the bearing frame 14, the retraction jacks 15A and 15B, and the fixed frame 16, the joint crushing device 13 is moved to the position of the joint 2a, and the crushing teeth 64 and the crushing teeth 64 are used. After the joint 2 a is positioned between the pedestal 62 and the crushing jacks 51, the crushing teeth 64 are moved down together with the lifting block 63 by operating the crushing jack 51.
[0048]
Here, after the crushing teeth 64 are brought into contact with the upper end edge of the joint 2a, when the crushing teeth 64 are further lowered, the gas pipe 2 is pressed and moved downward, and the crushing pedestal 62 is connected to the lower end of the joint 2a. When the edges come into contact with each other, the joint crushing device 13 itself does not move up and down, and the joint 2a is crushed. However, when the position of the gas pipe 2 is stationary or slight, the crushing teeth 64 are used. If the device itself moves upward, that is, rises until the lower end edge of the joint 2a comes into contact with the crushing pedestal 62 by reaction of the lowering of the joint 2a, there is a risk of wheel removal. However, in this joint crushing device 13, as described above, the wheel legs 56 on the direction lines of the square tubes 20A and 20B are urged downward by the spring member 59 (more precisely, in the downward rotation direction). As a result, the wheel leg 56 is moved downward by the amount of movement of the apparatus main body 12, and the contact state with the square tube rails 20A, 20B is always maintained, thereby preventing the wheel from being removed. .
[0049]
【The invention's effect】
As described in detail above, according to the apparatus of the present invention, the pipe buried in the ground is not limited to one of the vertical shafts regardless of the soil properties, that is, the frictional force, in order to draw the tensile steel wire connected to the impact type propulsion device by the jack operation. As a result, the buried pipe pulled out by the crushing head provided in the apparatus is sequentially crushed and the efficiency of the buried pipe is improved. In addition, the holding frame is provided with the holding chuck means, the pulling frame is provided with the traction chuck means, and the chuck means is configured to easily restrain and release the tensile steel wire. It becomes possible to perform reliably and efficiently, and it becomes possible to continuously draw the tensile steel wire in a tensioned state. Furthermore, automation can be easily performed by sequencer control.
[0050]
In addition, it is possible to dramatically improve the renewal efficiency of the pipes, such as high-strength joints that appear for each unit buried pipe length, by providing a dedicated joint crushing device. Become.
[Brief description of the drawings]
FIG. 1 is a side view of a drawing crushing apparatus 1 according to the present invention.
FIG. 2 is a plan view thereof.
FIG. 3 is a front view thereof.
4 is a plan view of the joint crushing device 13. FIG.
FIG. 5 is a front view thereof.
FIG. 6 is a side view thereof.
FIG. 7 is a structural diagram of a retractable jack stroke sensor.
8A and 8B show the structures of the holding chuck means 38 and the traction chuck means 45. FIG. 8A is a restrained state diagram, and FIG. 8B is a released state diagram.
FIG. 9 is a load replacement procedure diagram of the tensile steel wire rod 21;
FIG. 10 is a work procedure diagram (part 1) of the gas pipe renewal method using the drawing crushing apparatus 1;
FIG. 11 is a work procedure diagram (part 2) of the gas pipe renewal method using the drawing crushing apparatus 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Embedded pipe drawing crushing apparatus, 2 ... Embedded gas pipe, 2a ... Joint, 3 ... Impact type propulsion machine, 4 ... Dummy pipe, 5 ... PE pipe, 12 ... Traction crushing apparatus, 13 ... Joint crushing apparatus, 14 ... Support Pressure frame, 15A / 15B ... Jack for retraction, 16 ... Fixed frame, 17 ... Crushing head, 19 ... Retraction frame, 20A / 20B ... Square rail, 21 ... Tensile steel wire, 38 ... Holding chuck means, 45 ... Traction chuck Means: 50 ... Base, 51 ... Crush jack, 54A to 54D ... Support arm, 56 ... Wheel leg, 57 ... Roller, 59 ... Spring member, 63 ... Lifting block, 64 ... Crushing tooth, 62 ... Crush base, 73 ... Sleeve, 74 ... Collet, 75 ... Indicator member, 76 ... Spring member, 77 ... Chuck release cylinder, 79a / 79b ... Proximity switch, 80 ... Viewing window

Claims (4)

A supporting frame in which a passage hole portion through which the buried pipe passes is formed in a substantially central portion;
A pair of left and right pull-in jacks, the bottoms of which are connected and fixed to both ends of the bearing frame, and arranged in parallel along the direction of the buried pipe;
The head positions of these pull-in jacks are connected to each other, and the supporting frame is provided with a holding chuck means in which the crushing head is fixed to the side surface of the flange, and the tensile steel wire can be arbitrarily restrained and released. A fixed frame;
It is connected and fixed between the piston heads of the pull-in jack, and is composed of a pull-in frame provided with pulling chuck means that can arbitrarily restrain and release the tensile steel wire,
Each of the holding chuck means and the traction chuck means is fitted into the conical space, and a sleeve in which the tensile steel wire is inserted and a conical space in which the inner diameter is gradually narrowed in the anti-pulling direction is formed in the insertion portion. A collet that chucks the tensile steel wire by a wedge action, a spring member that biases and holds the collet in the anti-pulling direction, and is disposed at a facing position on the urging direction side of the collet and moves the collet in the pulling direction by a piston operation. A buried pipe drawing and crushing device comprising a chuck release cylinder that releases a restraint of a tensile steel wire rod by an extruded collet. It is supported by the traveling wheels and is movable along traveling guide members disposed on the left and right sides along the direction of the buried pipe, and the wheel holding member that holds the traveling wheels is elastic toward the traveling guide member side. A base that is urged to support it;
A crushing base suspended by and supported by the base body;
A crushing jack attached to the base body and provided with crushing teeth at a piston tip, and a crushing device for crushing a joint portion of a pipe located between the crushing base and the crushing jack. The drawing crushing apparatus for buried pipes according to claim 1. The embedment according to any one of claims 1 and 2, wherein the chuck release cylinder portion is provided with a proximity switch for obtaining piston position information for distinguishing between a released state of the tensile steel wire and a restrained state of the tensile steel wire. Pipe drawing and crushing equipment. The tensile steel wire is inserted into the rear end surface side of the collet, and the spring member is externally fitted, and a cylindrical indicator member that moves integrally with the collet is provided, and the collet is made of a tensile steel wire. 4. The buried crushing / pulling device according to claim 1, further comprising a viewing window through which the cylindrical indicator member can be visually confirmed when in the released state position.

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