JP6219698B2 - Joint pin fall-off prevention method and joint structure at the excavation equipment joint part of the pile driver - Google Patents

Description

  The present invention relates to a method for preventing the drop of the joint pin in the joint portion of the pile driving machine including a joint portion in which excavation equipment such as an excavation head and a drilling rod in the pile driving machine are connected by a joint pin, and the joint portion. Related to the joint structure.

  There are various types of pile driving machines used when penetrating or driving a pile into the ground in pile construction, such as a hammering system and a press-fitting system, and one of them is an excavating system that can be connected to an excavator such as an earth auger. Are widely used.

  This excavator such as an earth auger consists of excavation equipment such as excavation heads, stirring rods, and screws, but it is not an integrated one in consideration of workability, safety, flexible response to construction conditions, etc. The above-mentioned excavation equipment is connected. For example, in the case of a three-point pile driver with a typical leader height of 27 m, the axial direction of one excavation head, one screw, and several agitating rods is about 20 m or less, the longest of which the pile driver can hang at once. The one connected to is used.

  There are various methods for connecting the excavation equipment, and one of them is a joint pin. Many of them are provided with a mechanism for preventing the joint pin from coming off by a spring mechanism or a set bolt.

  For example, in Patent Document 1, a short-sized polygonal shaft, spline shaft, or serration shaft-shaped plug is formed at the tip of one rod parallel to the shaft, while the rear end of the other rod A socket for tightly fitting the plug is formed, and the plug is fitted to the socket in a state where the plug can be freely inserted and removed and also transmits a rotational force. The pin hole is penetrated through part or all of the plug, and a circumferential groove is formed on a circumferential line passing through the opening of the pin hole, and a cotter pin is inserted into the pin hole to insert the plug. Connect the rods of excavators, etc., so that both the socket and the rods are connected to prevent them from coming off and the cotter pins are stopped from coming off by fitting a split ring spring-like stopper ring into the circumferential groove. A mechanism is disclosed.

  Patent Document 2 discloses an earth auger characterized in that, in the auger shaft of the earth auger, the outer periphery of the joint pin in the joint of the connecting rod and the stirring rod constituting each auger shaft is covered with a joint pin cover, respectively. A joint pin safety device for a rod joint is disclosed.

  This joint pin connection is used not only for connecting the excavating equipment as described above, but also for connecting the upper and lower piles.

  For example, Patent Document 3 includes a male and female fitting-type joint attached to the lower end of the upper pile and the upper end of the lower pile, the male joint includes an outer peripheral deformed portion, and the female joint includes an inner peripheral deformed portion, By fitting these deformed parts together, both joints are rotated together, and in the fitted state between the deformed parts, the pins that connect the male and female joints are placed on the side so that the meat part of both joints is passed. A joint for joints of upper and lower piles to which the upper and lower piles are connected by being inserted from the side is disclosed.

  In Patent Document 4, in a mechanical joint structure of steel pipe piles in which two steel pipe piles are mechanically connected in series, a plurality of connection holes are formed in the radial direction on the end surface of one steel pipe pile in the radial direction. The outer joint pipe that has been slackened is fixed by welding, and an end fitting is fixed to the corresponding end face of the other steel pipe pile by welding, and is fitted inside the outer joint pipe to the other side face of the end fitting. An inner joint pipe in which a plurality of connection holes are formed in a radial direction in an arrangement matching the connection holes of the outer joint pipe is fixed to the peripheral wall by welding, and the inner joint pipe is inserted into the outer joint pipe. Is inserted, the connecting holes of the outer joint pipe and the inner joint pipe are made to coincide with each other, a connecting pin is inserted, and a drop-off preventing process is performed by a set bolt, so that the two steel pipe piles are connected. A mechanical joint structure for steel pipe piles is disclosed.

Japanese Patent Laid-Open No. 06-229185 JP 09-203074 A JP 2005-282187 A JP 2011-208373 A

  As described above, joint pins (connected horizontal pins) are used to connect the excavator equipment in the pile driving machine and excavator and to connect the upper and lower piles, and the joint pin is dropped due to external forces such as deterioration and vibration. In order to prevent this, a spring mechanism is provided to expand the diameter of the joint pin head, cover the pin hole opening with a stopper ring, cover the joint pin with a cover, or secure the joint pin with a locking bolt Some ideas have been made.

  However, although the above-mentioned various measures provided to prevent the joint pin from falling off function effectively at the beginning, the spring force of the spring mechanism gradually becomes weaker or disengaged in the long-term use of the joint pin. If the set bolts are loosened or deteriorated, the effect of preventing the dropout will be weakened, the joint pin will come off and be lost, and in the worst case, the drilling equipment such as the drilling head will be dropped into the drilling hole. There is.

  If the joint pin comes off and is lost, it may damage the excavation equipment, and if the fallen object that falls into the excavation hole cannot be recovered properly, loss due to loss of expensive equipment may occur, resulting in delays in construction period and pile core position. Changes also have to be dealt with, and these problems will plague construction personnel. Therefore, it is necessary to reinforce the conventional drop-off prevention process for the joint pin and make a new device that can maintain the drop-off prevention function for a long period of time.

  The present invention has been made in view of the conventional technology and problems as described above, and in a pile driving machine having a joint portion in which excavating equipment of a pile driving machine is connected by a joint pin, An object of the present invention is to provide a joint pin dropout prevention method and a joint structure in an excavation equipment joint portion of a pile driving machine that can easily reinforce the dropout prevention process and maintain a dropout prevention function for a long period of time.

The invention according to claim 1 of the present application is “a method of preventing the drop of the joint pin in the joint portion of the pile driving machine provided with a joint portion in which the excavating equipment of the pile driving machine is connected by the joint pin, A pressing member for preventing the joint pin from coming out of the pin hole on the outer surface near the joint pin in the joint portion, and a screw for rotatably mounting the pressing member along the outer surface near the joint pin Is installed, and a stopper member for suppressing the rotation of the presser plate to less than one rotation is installed, and the joint pin is pressed by pressing the head of the joint pin with the presser plate. Prevention of dropout of joint pins at excavation equipment joints of pile driving machines characterized by preventing them from coming out of pin holes It is the law. "

  The “pile driver” referred to in the present invention is an excavating pile driver capable of excavating the ground, a ground auger mainly connected to a three-point pile driver, other excavation bits, excavation heads, excavation rods It is a ground excavator in pile construction with etc.

  “Excavation equipment” refers to excavator equipment used for excavation work, such as an excavation head, a screw, a stirring rod, and a connecting rod. These equipments are connected to each other through a joint portion, and the connection is made by inserting a joint pin into a pin hole provided in the joint portion in a direction transverse to the axial direction of the equipment.

  The joint portion is a connection end portion or a joint portion of a conventional equipment for connecting the above-described excavation equipment, and the structure thereof is not particularly limited. For example, it consists of a male and female fitting joint provided at the connecting end of the excavating equipment as described in Patent Document 3.

  As described in Patent Documents 1 to 4, if the joint pin can be connected to the excavation equipment by being inserted into the pin hole in the lateral direction with respect to the axial direction of the equipment, the shape, dimensions, material The number of uses is not particularly limited. The joint pin itself has a drop-off prevention function, such as a spring loaded into the joint pin head so that the diameter of the head is enlarged or reduced by the spring so that it does not fall off easily. Is preferred. The joint pin installation structure is not particularly limited, and a conventional installation structure such as a parallel installation or a cross installation can be used as it is.

  In the present invention, as described above, in the joint portion, the joint pin is inserted into the pin hole in a direction transverse to the axial direction of the equipment, but the joint portion outer surface near the joint pin insertion position is connected to the outer surface. A drop-off prevention assisting tool comprising a pressing member comprising an installation jig and a pressing plate rotatable along the outer surface and a stopper member for suppressing the rotation of the pressing plate to less than one rotation is installed. And By installing such a drop-off prevention auxiliary tool, the conventional drop-off prevention process for the joint pin is easily reinforced, and the drop-off prevention function is maintained for a long period of time. Drop-off prevention aids can be installed on both new and existing equipment.

  The presser member is a member for pressing the joint pin head so that the joint pin head inserted into the pin hole will not jump out due to vibration or other external force and fall off. It comprises an installation jig for installing the member on the outer surface of the joint part.

  The presser plate may be a plate that is placed on the head of the inserted joint pin or covered and firmly pressed down. The shape is not necessarily flat and may be, for example, a cap that covers the head. The material is preferably heavy and has high durability and rigidity. Moreover, it is preferable that it is weldable. For example, a steel plate or a weldable alloy plate. The dimensions are determined according to the joint pin head dimensions. For example, when the dimension of the head of the joint pin is 35 mm, the dimensions of the steel pressing plate are 85 mm long, 40 mm wide, and 16 mm thick.

  The holding plate is attached to the outer surface of the joint portion by an installation jig so as to be rotatable along the outer surface of the joint portion. By making the presser plate rotatable in this way, the presser plate can be easily attached to and detached from the head of the joint pin. For example, the presser plate can be rotated about the support column by providing a through hole through which the support column passes at one end and passing the support column through the through hole. It is preferable that the through hole and the column are screwed.

  The installation jig is used to rotatably mount the presser plate on the outer surface of the joint. A joint where at least part of the presser plate can touch the head of the joint pin inserted into the pin hole and hold the head. Provided near the pin insertion position.

  The installation jig includes, for example, a support column and a support column, or a bolt and a nut that serve as a rotation shaft of the press plate.

  The dropout prevention assisting tool of the present invention comprises the pressing member and a stopper member for suppressing the rotation of the pressing plate to less than one rotation. By suppressing the rotation of the presser plate to less than one rotation, the presser plate can be prevented from loosening and the head of the joint pin can be kept pressed by the presser plate, so that the joint pin can be prevented from coming out.

  The stopper member is a weldable, rigid and durable material such as a steel block or a weldable alloy block, and the presser plate can be rotated by less than one turn in one direction of clockwise or counterclockwise rotation. Provided on the outer surface of the joint near the member. The attachment to the outer surface of the joint part is performed by welding, for example. The rotation is used for attaching and detaching the presser plate to the head of the joint pin.

  The invention according to claim 2 of the present application is as follows: "The pressing member includes the installation jig including a bolt and a nut, and the bolt and the pressing plate are integrated by welding, and the nut is welded to the outer surface. The pile jointer excavation equipment joint according to claim 1, wherein the bolt integrated with the presser plate is screwed into the nut and installed on the outer surface. Is a method for preventing the joint pin from falling off at the portion.

  As described above, the presser member includes the presser plate and the installation jig. However, since the presser plate can be rotated, the installation jig is preferably a screw type. In the screw type, if a general-purpose bolt and nut are used, an installation jig can be obtained simply and inexpensively.

  The bolt is passed through a bolt hole formed in a part of the holding plate, and the bolt and the holding plate are integrated by welding. If it does so, it will become easy to suppress attachment or detachment to the head of the joint pin of a press plate, and rotation of a press plate to less than one rotation. On the other hand, the nut is attached to the outer surface of the joint part by welding. The presser plate integrated with the bolt has a plate surface approximately along the outer surface of the joint portion by screw connection of the bolt and nut by screwing the bolt into the nut. The presser plate is rotatable with the bolt around the bolt. Therefore, if the bolt is screwed into the nut while turning the presser plate after attaching the joint pin to the joint part, the presser plate can be easily installed on the head of the joint pin. Even when the presser plate is removed from the head of the joint pin, it can be easily removed by turning the presser plate by hitting the side of the presser plate with a hammer.

The invention according to claim 3 of the present application is “a joint structure of the joint portion of the pile driving machine including a joint portion in which the equipment for excavation of the pile driving machine is connected to each other by a joint pin, One joint end has a male shape and is provided with a pin hole for inserting the joint pin laterally. The other joint end of the excavation equipment has a female shape and the joint pin is inserted laterally. A pin hole is formed so as to match the pin hole of the one joint end, and both the joint ends are connected to each other, and the joint pin is inserted into both the matched pin holes. Thus, the joint portion is fixed by the joint pin, and the joint pin has an outer surface near the joint pin. And pressing member for preventing the coming off from the pin hole, prevent the presser member and setting jig rotatably attached threaded along the outer surface in the vicinity of the joint pin, to less than one revolution of rotation of the pressing plate A stopper member for preventing the joint pin from being installed, and the joint pin is prevented from coming out of the pin hole by pressing the head of the joint pin with the presser plate. It is the “joint structure of the excavation equipment joint part of the pile driver”.

  The equipment for the pile driver and excavator is as described above. The joints are of the male / female coupling type (fitting type, concave / convex type) commonly used in the past, and each of the excavating equipment connected to each other has a joint end, and one of the joints The end portion is male and the other joint end is female. The male joint end is fitted into the female joint end and is connected to each other.

  The side surfaces of both joint ends are provided with pin holes for inserting joint pins in the lateral direction, and by inserting the joint pins into the pin holes with both pin holes aligned, The joint part (both joint ends fitted together) is fixed with a joint pin.

  The cross-sectional shape of the joint end may be circular, but is preferably hexagonal. By using a hexagonal shape, it is possible to firmly fix the male and female connections and joint pins. The joint pin is as described above.

  On the outer surface of the joint part (female-shaped joint end part serving as an outer tube for male-female connection), the joint pin is pulled out by the “method for preventing the joint pin from dropping in the excavation equipment joint part of the pile driver” of the present invention. -A dropout prevention aid is provided to prevent the dropout. The details of the dropout prevention aid are as described above, and will be omitted.

  The “joint structure of the excavating equipment joint part of the pile driving machine” of the present invention is equipped with a drop-off prevention assisting tool according to the “method of preventing the joint pin from dropping in the excavating equipment joint part of the pile driving machine” described above. It is characterized by being. Therefore, it is difficult for the joint pin to fall off over a long period of time, and the joint structure can maintain the drop-off preventing function longer than the conventional joint structure using the joint pin.

  The invention according to claim 4 of the present application is as follows: "The pressing member includes the installation jig including a bolt and a nut, and the bolt and the pressing plate are integrated by welding, and the nut is welded to the outer surface. The pile jointer excavating equipment joint according to claim 3, wherein the bolt integrated with the presser plate is screwed into the nut and installed on the outer surface. Part joint structure ".

  This invention limits the structure of the holding member of the drop-off prevention auxiliary tool in the joint structure, and the invention is substantially the same as the invention according to the second aspect, and details thereof are described in the second aspect. This is as described in the invention. Since it overlaps, description is abbreviate | omitted.

  The invention according to claim 5 of the present application is as follows: “The two pin holes are provided in the same horizontal plane or two steps with respect to the axial direction of the excavation equipment, and the joints are provided in the pin holes. 5. Two pins are inserted in parallel, and two of the drop-off prevention aids are installed in the joint portion so as to hold the heads of the two joint pins, respectively. Is the joint structure of the excavation equipment joint part of the pile driving machine described in 1.

  The present invention is such that in the above joint structure, the connection and fixing of the excavation equipment with the joint pins are limited to those using two joint pins, and the installation of the drop-off prevention aid is limited to two according to this. It is.

  As the number of joint pins used increases to a certain extent, the excavation equipment can be more firmly connected and fixed. From the viewpoint of excavation efficiency, cost, etc., it is not preferable to have too much.

  In the “joint structure of the excavation equipment joint portion of the pile driver” according to the present invention, the use of two pins is sufficient because the joint pin is much more difficult to drop than before.

  The two joint pins are installed in the same horizontal plane or in a step with respect to the axial direction of the excavation equipment. A slightly stepped portion makes it easier to install and operate the dropout prevention aid.

  If the excavating equipment joint portion of the pile driving machine in which the excavating equipment is connected to each other by the joint pin is formed using the joint pin falling-off prevention method of the present invention, the conventional joint structure is not significantly changed. The conventional drop-off prevention process can be easily reinforced and the drop-off prevention function can be maintained over a long period of time.

  Moreover, by making the structure of the excavating equipment joint portion of the pile driving machine in which the excavating equipment is connected by the joint pin to the joint structure of the present invention, it is difficult for the excavating equipment to fall off for a long time. A joint structure that is stably and firmly connected can be easily obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of embodiment of "the joint pin drop-off prevention method in the equipment joint part for excavation of a pile driver" of this invention, (a) is a figure which shows the application locations A and B, (b) is It is an expansion perspective view which shows the outline of the joint part in the application location A. FIG. It is the schematic created based on the photograph which shows the installation condition to the outer surface of the female-shaped joint edge part of the drop-off prevention auxiliary tool of this invention. (A) is a figure which shows the state which set the press plate to the head of the joint pin, (b) is a figure which respectively shows the state which cancelled | released the press plate from the head of the joint pin. It is a figure which shows the "joint structure of the equipment joint part for excavation of a pile driver" of this invention which installed the fall-off prevention auxiliary tool of this invention in the conventional joint part shown in FIG. (A) is a front view, (b) is a side view. It is a figure which shows the operation | work of the cancellation | release from the head of the joint pin of the presser plate by rotation of a presser plate, and the setting to the head of a joint pin. (A) is the figure which shows cancellation | release from the state which set the presser plate to the head of the joint pin, (b) is a figure which shows the setting after releasing the presser plate from the head of the joint pin. It is a figure which shows an example of the pressing member in the drop-off prevention auxiliary tool of this invention. (A) is a figure which shows the structure of a pressing member, (b) is a figure which shows the assembled state. It is a figure which shows an example of the joint structure of the equipment joint part for excavation of the conventional three-point pile driver which can apply the fall prevention method of the joint pin of this invention. (A) is a figure which shows the male-female joint of the male joint end part in one excavation rod, and the female joint end part in the other excavation rod, (b) is a joint part by insertion in the pin hole of a joint pin FIG. 8C is a view showing an example of the joint pin, (c-1) is a front view showing the whole, and (c-2) is a head in an expanded state. A view in the Y direction, (c-3) is a view in the Y direction showing the head in a reduced diameter state, and (d) is a view showing a process for preventing the joint pin from falling off by a set bolt.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

  FIG. 6 is a diagram showing an example of the joint structure of the excavation equipment joint portion of the conventional three-point pile driving machine 1 to which the joint pin fall-off prevention method of the present invention can be applied. In this example, the excavation equipment 2 Is a drilling rod (stirring rod) 3, and shows a joint structure of a joint portion 10 that connects the drilling rods (stirring rods) 3, 3.

  (A) is a figure which shows the male-and-female joint of the male-shaped joint end part 11 in one excavation rod 3, and the female-shaped joint end part 12 in the other excavation rod 3, (b) is a pin hole 13 of the joint pin 14. X direction arrow direction view showing fixation of joint part 10 by insertion into, (c) is a figure showing an example of the joint pin 14, (c-1) is a front view showing the whole, (c-2) is A view in the Y direction showing the head (14-1) in the expanded state, (c-3) is a view in the Y direction showing the head (14-1) in the reduced diameter state, and (d) is a set bolt. FIG. 15 is a diagram showing a joint pin 14 drop-off prevention process by 15;

  As shown in FIG. 6A, the joint portion 10 includes a male joint end portion 11 and a female joint end portion 12, and the male joint end portion 11 is replaced with a female joint end portion 12. The male and female can be combined by inserting into.

  The male joint end 11 has a hexagonal horizontal cross section, and is provided with a semicircular pin hole 13 through which the joint pin is inserted, as shown in the figure. On the other hand, the female joint end portion 12 is a hollow tube so that a male joint end portion 11 can be formed, and the inner surface has a hexagonal shape in horizontal section to match the outer shape of the male joint end portion 11. ing. The circular pin hole 13 through which the joint pin is inserted is provided so as to coincide with the semicircular pin hole 13 in the male joint end portion 11 when the male and female joints are coupled.

  The male and female joints are inserted into the female joint end 12 by inserting the male joint end 11 into the female joint end 11 so that a semi-circular pin hole 13 and female in the male joint end 11 can be inserted. This is done by matching the circular pin holes 13 at the joint end 12 of the shape. In this example, the pin hole is drilled with a step in the axial direction, but may be drilled horizontally without a step.

  As shown in FIG. 6 (b), the joint part 10 having the male and female joints is fixed by inserting it into a pin hole 13 in which the joint pin 14 is matched. In this example, the two joint pins 14 are inserted in the same direction, but the present invention is not limited to this.

  FIG. 6 (c) shows an example of a joint pin. In this example, the joint pin 14 has a head 14-1 loaded with a spring so that it is difficult to be removed, and the tip is tapered. Yes. FIG. 6C-2 shows a state where the spring is extended and the head 14-1 is expanded in diameter. By expanding the diameter in this way, the head 14-1 is pressure-bonded to the pin hole 13, and the joint pin 14 is difficult to be removed from the pin hole 13.

  As described above, the joint pin 14 inserted into the pin hole 13 is difficult to come off due to the spring effect of the head 14-1, but as shown in FIG. In addition, it is preferable to perform a process for preventing the joint pin 14 from falling off by the set bolt 15. The joint pin 14 inserted into the pin hole 13 is pressed from the lateral direction with a set bolt 15 to prevent the joint pin 14 from falling off.

  As described above, the joint pin 14 is prevented from falling off even in the prior art. However, since the spring effect is gradually weakened or the stop bolt 15 is loosened by vibration, only the conventional dropout prevention processing is performed. However, it cannot be said that the drop-off prevention function can be maintained for a long time. If the fall prevention aid of the present invention is installed in the joint portion 10 as described above, the fall prevention function is strengthened, so that the joint pin 14 is difficult to fall off over a long period of time, and the drilling equipment is stably and firmly connected. The joint structure of the joint portion 10 thus obtained is easily obtained.

  FIG. 1 is a schematic diagram showing an example of an embodiment of the “method for preventing drop of a joint pin in an excavation equipment joint portion of a pile driving machine” according to the present invention, (a) is a diagram showing application locations A and B; (B) is an enlarged perspective view showing an outline of the joint portion 10 at the application location A. FIG.

  In FIG. 1 (a), a three-point pile driver 1 includes an excavating equipment 2 such as an excavating rod (agitating rod) 3, a screw 4 and an excavating head 5. The “joint pin drop-off prevention method” is suitably applied to joint portions such as an application location A where the excavation rod (stirring rod) 3 and the screw 4 are connected and an application location B where the screw 4 and the excavation head 5 are connected. .

  The joint portion 10 of the application location A has a male-female joint structure of the male joint end portion 11 and the female joint end portion 12 shown in FIG. The dropout prevention auxiliary tool 6 of the present invention is installed.

  The drop-off prevention auxiliary tool 6 includes a presser member 6-1 including a presser plate 7, and an installation jig 8 including a bolt 8-1 and a nut 8-2, and a stopper member 6-2.

  1B shows a set state, and the joint pin 14 is prevented from coming out of the pin hole by pressing the head of the joint pin 14 with the presser plate 7. 1B shows the set release state, and the presser plate 7 is removed from the head of the joint pin 14, and the head of the joint pin 14 is slightly protruded.

  An installation jig 8 for the presser plate 7 includes a bolt 8-1 and a nut 8-2, and the nut 8-2 is fixed to the outer surface of the female joint end 12 by welding. The presser plate 7 is provided with a bolt hole (through hole) through which the bolt 8-1 is passed. The presser plate 7 and the bolt 8-1 are integrated by welding, and as shown in FIG. The nut 8-2 is attached to the outer surface of the female joint end portion 12.

  As shown in the figure, a stopper member 6-2 is provided on the outer surface of the female joint end portion 12 by welding as shown in the figure. The stopper member 6-2 is made of a steel block. The stopper member 6-2 prevents the presser plate 7 from rotating approximately 270 ° or more in the clockwise direction or the counterclockwise direction around the bolt 8-1. In this way, loosening of the bolt 8-1 is prevented by controlling the rotation of the presser plate 7.

  By making the joint structure of the joint portion 10 in the excavating equipment 2 the structure of the present invention using the dropout prevention auxiliary tool 6 of the present invention, the joint pins are difficult to fall off over a long period of time and the excavating equipment is stable. Thus, a joint structure that is firmly connected can be obtained. Further, the joint structure of the present invention reinforces the conventional joint structure, and the conventional joint structure can be utilized as it is, so that it can be performed simply and at low cost. Further, since the presser plate 7 can be attached to and detached from the head of the joint pin 14 by the rotation of the presser plate 7 with one hand hammer by an operator, the workability is good.

  FIG. 2 is a schematic diagram created based on a photograph showing the installation state of the female joint end 12 of the dropout prevention aid 6 of the present invention on the outer surface. (A) is a figure which shows the state which set the presser plate 7 to the head of the joint pin 14, and (b) is a figure which shows the state which released the presser plate 7 from the head of the joint pin 14, respectively.

  In this example, the joint portion 10 is fixed by two joint pins 14 provided with a step with respect to the vertical axis direction, and two sets of dropout prevention assisting tools 6 are fitted to the outer surface of the female joint end portion 12 in accordance with this. Is installed. The details of the dropout prevention aid 6 are as described above with reference to FIG.

  As shown in FIG. 2 (a), the drop-off prevention auxiliary tool 6 of the present invention is installed on the outer surface of the female joint end 12 and the presser plate 7 is set on the head of the joint pin 14. Dropout can be prevented. Further, the drop-off prevention assisting tool 6 is set in a set state as shown in FIG. 2 (a) or released as shown in FIG. 2 (b) when an operator rotates the presser plate 7 with a hand hammer. Workability is good.

  FIG. 3 is a view showing a “joint structure of an excavation equipment joint portion of a pile driving machine” according to the present invention in which the dropout prevention auxiliary tool 6 of the present invention is installed in the conventional joint portion 10 shown in FIG. 6. (A) is a front view, (b) is a side view.

  As described in the description of FIG. 6, the joint portion 10 has a male joint end portion 11 and a female joint end portion 12 which are male and female coupled and fixed by two joint pins 14.

  Two dropout prevention assisting tools 6 of the present invention are installed on the outer surface of the female joint end 12. The drop-off prevention auxiliary tool 6 includes a pressing member 6-1 and a stopper member 6-2. The pressing member 6-1 includes a pressing plate 7 and an installation jig 8. The installation jig 8 is a bolt 8 in this example. -1 and nut 8-2.

  The details of these dropout prevention aids 6 are as described above with reference to FIG. As described above, in the present invention, the conventional joint structure of the joint portion 10 using the joint pin 14 can be used as it is without greatly changing, and the drop prevention assisting tool 6 of the present invention is simply installed on the outer surface of the joint portion 10. Since the pin 14 can be prevented from falling off, it is simple, efficient and economical.

  FIG. 4 is a diagram illustrating the operation of releasing the presser plate 7 from the head of the joint pin 14 and setting the joint pin 14 to the head by rotating the presser plate 7. (A) is a figure which shows cancellation | release from the state which set the presser plate 7 to the head of the joint pin 14, (b) is a figure which shows the set after releasing the presser board 7 from the head of the joint pin 14.

  As shown in FIG. 4A, in order to release the presser plate 7 from the head of the joint pin 14, the arrow is applied by hitting the side of the presser plate 7 with a hand hammer or turning the head of the bolt 8-1 with a wrench. The presser plate 7 may be turned in the direction shown in FIG. 4 (b). Further, as shown in FIG. 4B, in order to set the presser plate 7 on the head of the joint pin 14, the side of the presser plate 7 is hit with a hand hammer or the head of the bolt 8-1 is turned with a wrench. Then, the presser plate 7 may be turned in the direction of the arrow so that the state shown in FIG. As described above, in the present invention, the set state and the released state of the presser plate 7 on the head of the joint pin 14 can be formed only by the rotation of the presser plate 7 with a hand hammer or a wrench.

  FIG. 5 is a view showing an example of a pressing member 6-1 in the dropout prevention aid of the present invention. (A) is a figure which shows the structure of the pressing member 6-1, (b) is a figure which shows the assembled state.

  As described above, the holding member 6-1 is a member for pressing the head of the joint pin so that the head of the joint pin inserted into the pin hole does not pop out due to an external force such as vibration and the joint pin falls off. It consists of a pressing plate 7 for pressing the head and an installation jig 8 for installing the pressing member on the outer surface of the joint part.

  In this example, the installation jig 8 includes a bolt 8-1 and a nut 8-2. The holding plate 7 is provided with a through hole (bolt hole) through which the bolt 8-1 is passed. In the assembled state, the presser plate 7 and the bolt 8-1 are integrated by welding 9, and the tip of the bolt 8-1 is screw-coupled to the nut 8-2 so as to be rotatable. Therefore, the presser plate 7 and the bolt 8-1 rotate integrally. The reason why the press plate 7 and the bolt 8-1 are integrated is that the press plate 7 can be easily mounted and adjusted.

  As described above, the nut 8-2 is welded to the outer surface of the female-shaped joint end portion, whereby the pressing member 6-1 is installed on the outer surface of the female-shaped joint end portion. Thus, the dropout prevention assisting tool of the present invention can be easily installed at the joint portion of the excavation equipment.

  DESCRIPTION OF SYMBOLS 1 ... Three-point pile driver, 2 ... Excavation equipment, 3 ... Excavation rod (stirring rod), 4 ... Screw, 5 ... Excavation head, 6 ... Drop-off prevention auxiliary tool, 6-1 ... Presser member, 6-2 DESCRIPTION OF SYMBOLS ... Stopper member, 7 ... Holding plate, 8 ... Installation jig, 8-1 ... Bolt, 8-2 ... Nut, 9 ... Welding, 10 ... Joint part, 11 ... Male joint end part, 12 ... Female shape Joint end, 13 ... pin hole, 14 ... joint pin, 15 ... set bolt

Claims (5)

A method of preventing the drop of the joint pin in the joint part of the pile driver provided with a joint part in which excavating equipment of the pile driver is connected by a joint pin, the outer surface of the joint part in the vicinity of the joint pin A presser member for preventing the joint pin from coming out of the pin hole, a screw-type installation jig for rotatably mounting the presser member along the outer surface in the vicinity of the joint pin, and rotation of the presser plate A stopper member for preventing the joint pin from being rotated less than one rotation is installed, and the joint pin is prevented from coming out of the pin hole by pressing the head of the joint pin with the presser plate. A method for preventing the joint pin from falling off at the joint part for excavation of the pile driving machine.   The presser member includes the installation jig made of a bolt and a nut, and the bolt and the presser plate are integrated by welding, and the nut is attached to the outer surface by welding, and is integrated with the presser plate. The method for preventing a joint pin from falling off in an excavation equipment joint portion of a pile driving machine according to claim 1, wherein the bolt is screwed into the nut and installed on the outer surface. A joint structure of the joint portion of the pile driving machine having a joint portion in which the excavating equipment of the pile driving machine is connected to each other by a joint pin, wherein one joint end of the drilling equipment is male and the joint A pin hole for inserting the pin in the lateral direction is provided, and the other joint end of the excavation equipment is female, and the pin hole for inserting the joint pin in the lateral direction is the end of the one joint It is provided to match the pin hole of the part, both joint ends are male and female coupled, and the joint part is fixed by the joint pin by inserting the joint pin into both matched pin holes The joint pin is prevented from coming out of the pin hole on the outer surface of the joint portion in the vicinity of the joint pin. It consists of a pressing member, a setting jig of threaded mounting the presser member rotatably along the outer surface in the vicinity of the joint pin, a stopper member for inhibiting the rotation of the pressing plate in less than one revolution for A pile driving machine joint for excavation of a pile driving machine characterized in that a drop-off preventing auxiliary tool is installed and the joint pin is prevented from coming out of the pin hole by pressing the head of the joint pin with the presser plate Joint structure.   The presser member includes the installation jig made of a bolt and a nut, and the bolt and the presser plate are integrated by welding, and the nut is attached to the outer surface by welding, and is integrated with the presser plate. The joint structure of the excavating equipment joint part of the pile driving machine according to claim 3, wherein the bolts screwed into the nuts are installed on the outer surface.   Both the pin holes are provided in the same horizontal plane or two steps with respect to the axial direction of the excavation equipment, and two of the joint pins are inserted in parallel into these pin holes, 5. The pile joint excavation equipment joint according to claim 3, wherein two drop-off prevention aids are installed in the joint portion to respectively hold the heads of the two joint pins. Joint structure.