JP2013185301A - Mounting method of weldless joint for pile and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method allowing mounting work of a weldless joint to be performed by using a simple member at low cost, and a device for the method.SOLUTION: A weldless joint for a pile includes a plurality of arcuate plates 15 made to straddle over both end metal fittings 12 of joint ends of piles to be connected to each other, wound around the outer peripheries thereof and fitted for arrangement; a flange-like projection 13 is integrally provided on the outer periphery of each end metal fitting, a recessed groove 17 to which the projections of both the end metal fittings are fitted is provided in the inner peripheral surface of the arcuate plate, both the projections 13 are fitted into the recessed groove 17, and the inter-plate connection metal fitting 21 is fitted to the outer periphery of both the end metal fittings 12; and when connecting the arcuate plates via an inter-plate connection metal fitting 21, an arcuate plate holding device using a permanent magnet 32 is used, each arcuate plate 15 is mounted at a predetermined place by attracting it to the end metal fitting 12 by magnetic force, the inter-plate connection metal fitting 21 is mounted after all of the arcuate plates 15 are mounted, and the arcuate plate holding device is removed.

Description

  The present invention relates to a pile non-welded joint mounting method and apparatus for connecting piles joined in the axial direction to each other without welding when a precast concrete pile or other pile is built in the ground.

  In general, when building ready-made piles in the ground, it is common to build precast concrete piles of a predetermined length to the desired depth while connecting them in the length direction as necessary. As for the connection between the piles, a method of connecting the metal end plates integrated with the end face of the precast concrete pile by welding is performed.

  However, in this connection method by welding, the connection strength depends on the quality of welding and requires a high degree of skill, but recently there is a shortage of skilled engineers, and the pile connection work is an outdoor work at the pile driving site. Therefore, there is a problem that it depends on the weather.

  For this reason, in recent years, non-welded joints not based on welding have been developed. In this conventional non-welded joint, as shown in FIG. 7, a cylinder fitted over the outer periphery of both piles 1 and 2 of both piles 1 and 1 to be connected to each other is radially arranged. A plurality of split arc-shaped plates 3 are provided, and flange-shaped ridges 5 and 5 projecting from the outer peripheral surfaces of both end fittings 2 and 2 are fitted into the concave grooves 4 formed on the inner peripheral surface of the arc-shaped plate 3. In addition, a method of connecting the arc-shaped plates 3 and 3 by fixing the plate-shaped arc-shaped inter-plate connecting metal fitting 6 across the outer surface of the end portions of the adjacent arc-shaped plates 3 and 3 has been developed ( For example, Patent Documents 1 and 2).

  In this method, the arc-shaped plate-to-plate connecting metal fitting 6 is provided with a tapered dovetail groove 7 having a narrow taper on either the upper or lower side and a dovetail-shaped cross section, and each end of the arc-shaped plates 3 and 3 adjacent to each other. On the outer surface, there are provided arc-plate connecting projections 8 each having a tapered dovetail shape that fits into the tapered dovetail groove 7, and the tapered dovetail grooves 7 are formed on both arc-shaped plate connecting projections 8, 8. By fitting, the adjacent arc-shaped plates 3 and 3 are connected to each other.

JP-A-9-59971 JP2011-89302A

  In such a conventional non-welded joint for piles, the non-welded joint having the structure shown in FIG. 7 described above has a predetermined number of arc-shaped plates straddling the upper and lower end fittings on the outer circumference of the pile end fitting. After mounting, the arcuate plate-to-plate connecting bracket is mounted, and when the mounting of all the arc-shaped plate-to-plate connecting brackets is finished, it becomes a ring shape and does not fall off.

  For this reason, if the arc-shaped plate is obtained by dividing the ring into three parts, it is necessary to hold each arc-shaped plate individually until the mounting of all three arc-shaped inter-plate coupling fittings is completed.

  For this reason, in the method shown in Patent Document 1, the worker has worked to hold the arc plate with several people and the mounting operation of the connecting member between the arc plates, but in this method, the pile diameter is large. As a result, the connecting metal fittings between the arcuate plates have become large and heavy, and there is a problem that supporting them manually is a heavy labor and is dangerous.

  In addition, as shown in Patent Document 2, the arc-plate connecting brackets are mounted with the individual arc-shaped plate connecting brackets temporarily fixed to the end fittings of the piles by bolts, and the temporary fixing bolts are removed. There is also a method of tightening with arc-plate connecting metal fittings, but in this method it is necessary to pre-form screw holes for temporary fixing in the pile end metal fittings, and in order to protect this, a tool is attached to the end face A filling hole with a square hole for fitting is installed, and in this state, concrete is placed and steam curing is performed after demolding. However, because it is in a harsh environment for screw holes and filling bolts, There was a problem that the hole-filling bolt could not be removed, and temporary fixing with the bolt could not be performed.

  Thus, in view of the conventional problems, the present invention has been made for the purpose of providing a method and apparatus capable of performing a welding-free joint mounting operation at low cost and safely using simple members.

  The feature of the invention described in claim 1 for solving the conventional problems as described above is fitted in a winding arrangement on the outer periphery of both ends of the joint end portions of the piles to be connected to each other. A plurality of arc-shaped plates, and integrally provided with flange-shaped ridges on the outer periphery of each end fitting, and provided with concave grooves in which the ridges of the both-end fittings are fitted on the inner peripheral surface of the arc-shaped plate, A pile that connects the piles by fitting the both ridges in a concave groove, fitting the arc-shaped plate to the outer periphery of the metal fittings at both ends, and connecting the arc-shaped plates via an arc-shaped plate-to-plate connecting metal fitting. In the non-welded joint mounting method, an arc-shaped plate holding device using a permanent magnet is used, and each arc-shaped plate is attracted to the end fitting by a magnetic force by the arc-shaped plate holding device. Wear, and the arcuate plate between connecting fitting mounted after mounting completion of all the arcuate plate, thereafter, it is to remove the arc-shaped plate holding device.

  The invention according to claim 2 is characterized in that, in addition to the configuration of claim 1, the arcuate plate-to-plate coupling metal has a tapered taper groove in which either one of the upper and lower sides has a narrow taper shape and the cross section has a dovetail groove shape. Each of the arc-shaped plates adjacent to each other is provided with projections for connecting between the arc-shaped plates, each of which has a shape in which tapered dovetails that fit into the tapered dovetail grooves are vertically divided. By fitting the tapered dovetail groove to the inter-connecting projection, the adjacent arc-shaped plates are connected by the arc-shaped inter-plate connecting fitting.

  According to a third aspect of the present invention, in addition to the structure of the second aspect, the arcuate plate-to-arc connecting fitting is fitted to the arcuate plate-to-plate connecting protrusion and the arc-shaped plate-to-arc plate fitting is mounted. It is to screw both ends of the connecting metal fittings to the arc plates adjacent to each other.

  According to a fourth aspect of the present invention, there is provided a permanent magnet housed in a rotatable manner inside, a magnet block that can be switched between adsorption and non-adsorption by magnetic force by rotation of the permanent magnet, and the magnet block The pile-free welded joint arc-shaped plate holding device used in the method according to any one of claims 1 to 3, further comprising a temporary fixing means that is detachably fixed to the arc-shaped plate.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the temporary fixing means is a clamping device that is fixed to the outer box of the magnet block and elastically sandwiches the arc-shaped plate.

  In the pile non-welded joint mounting method according to the present invention, as described in claim 1, an arc-shaped plate holding device using a permanent magnet is used, and each arc-shaped plate is connected to the end by a magnetic force by the arc-shaped plate holding device. It is attached to a predetermined position by adsorbing to the metal fitting, and after the completion of the installation of the whole arc-shaped plate, the arc-shaped plate connecting metal fitting is installed, and then the arc-shaped plate holding device is removed, so that one person Each arc plate can be temporarily attached to the joint by the operator, and the arc plate is held against the joint using the attractive force of the permanent magnet, not the electromagnet. Even if it happens, there is no risk of dropping off and the operation can be continued safely.

  According to a second aspect of the present invention, the arc-shaped plate-to-plate connecting bracket includes a tapered dovetail having a narrow taper on either the upper or lower side and a cross-sectional shape of a dovetail, and is adjacent to each other. On the outer surface of each end of the matching arcuate plates, there are provided arcuate interplate connecting projections each having a tapered dovetail shape that fits into the tapered dovetail groove. By fitting the tapered dovetail groove, the arc plate adjacent to each other is connected by the connecting member between the arc plates so that the arc plate holding device is removed and fastened after the connecting member between the arc plates is attached. Since the work can be performed, the work becomes easy.

  According to a third aspect of the present invention, as described in the third aspect of the present invention, after the arcuate plate-to-plate connection fitting is mounted by fitting the tapered dovetail groove to the arc-shaped plate-to-plate connection projection, Since the portions are screwed to the arc plates adjacent to each other, even when a bending stress is generated in the joint portion, deformation of the arc-plate connecting bracket is prevented, and a strong connection between the piles is achieved.

  According to a fourth aspect of the present invention, there is provided a magnet block including a permanent magnet rotatably accommodated therein, wherein the magnet block can be switched between adsorption and non-adsorption by magnetic force by rotation of the permanent magnet, By providing a temporary fixing means for detachably fixing the magnet block to the arc plate, the pile-free welded joint arc plate holding device is configured, so that the arc plate mounting operation is simplified and can be performed with less labor. .

  According to the present invention, the temporary fixing means is fixed to the outer box of the magnet block, and is a holding tool for elastically sandwiching the arc-shaped plate. It can be easily attached to and detached from the plate, improving work efficiency.

It is a longitudinal cross-sectional view which shows an example of this invention method and an apparatus. It is a perspective view of an apparatus same as the above. It is a cross-sectional view which shows an example of the pile non-welded joint which implements this invention. It is a fragmentary cross-sectional view which shows an arc-shaped plate connection part same as the above. FIG. It is the sectional view on the AA line in FIG. It is a longitudinal cross-sectional view which shows the conventional pile non-welded joint.

  Next, embodiments of the present invention will be described based on the examples shown in the drawings.

  First, an example of a pile non-welded joint that implements the pile non-welded joint mounting method and apparatus according to the present invention will be described with reference to FIGS.

  In the figure, reference numeral 10 is a pile body, 11 is a steel pipe covering the outer periphery of the pile body 10, and 12 is an end fitting integrally provided at the end of the pile body 10.

  The end fitting 12 is composed of a circular plate-like end plate portion 12a and a cylindrical ring-shaped skirt portion 12b integrally formed on the outer peripheral portion of the back surface thereof. A flange-like ridge 13 is integrally formed on the outer periphery of the end of the end fitting 12.

  Reference numeral 15 denotes an arc-shaped plate having a shape obtained by dividing the weekly direction of the cylindrical ring into three parts, and an inner peripheral surface is formed in an arc shape having substantially the same curvature as the outer peripheral surface of the end fitting 12. When the arc-shaped plates 15, 15, 15 are fitted to the outer periphery of the end fitting 12, the arc-shaped length is formed so as to create a gap 16 that absorbs a tightening margin at the time of tightening described later.

  On the inner peripheral surface of the arc-shaped plate 15, when the end fittings 12, 12 of the piles 1, 1 that are connected to each other are joined to each other in a butt arrangement, the adjacent ridges 13, 13 that are adjacent to each other are provided. A fitting groove 17 (shown in FIG. 6) is formed.

  The arc-shaped plate connecting projections 20 and 20 are connected to each other by the arc-shaped plate connecting fitting 21 to be connected and fixed, and the outer surfaces of the arc-shaped plate connecting projections 20 and 20 are on the same plane. The outer surface is formed flat so as to be positioned.

  As shown in FIG. 3 and FIG. 4, the arc-shaped plate-to-plate connecting projections 20 and 20 have a vertically tapered shape with a narrow upper side and end surfaces of the adjacent arc-shaped plates 15 and 15 facing each other. The ant shape is divided in half vertically.

  That is, the arc-shaped interplate connecting projection 20 has a plate end side surface 20a parallel to the pile axis, and a plate center side surface 20b having a tapered shape with the upper side inclined toward the plate end side, That is, the protrusion surface side is formed in a wide dovetail shape from the protrusion root part. As a result, a pair of adjacent arc-shaped plate-to-plate connecting projections 20 and 20 form a tapered shape whose upper side is squeezed, and both tapered surfaces are formed in a wide dovetail shape on the projection surface side.

  The arc-shaped plate-to-plate connecting bracket 21 has a tapered dovetail groove 22 into which the pair of arc-shaped plate-to-plate connecting projections 20 and 20 that are tapered as described above are fitted. 21 is slid from the upper side of the arc-shaped interplate connecting projections 20, 20 and inserted into the tapered dovetail groove 22, whereby the horizontal component force generated in the tapered surface is generated by the arc-shaped interplate connecting projections 20, 20. The two are connected to each other while acting in the direction of pulling 20 together.

  Thus, the three arc-shaped plates 15 are connected in a cylindrical shape by connecting the ends of the three arc-shaped plates 15 in a circular arrangement to each other by the three arc-shaped plate-to-plate connecting fittings 21 so that the ends of the two piles are connected to each other. The brackets 12 and 12 are connected.

At both end portions of the arc-shaped plate-to-plate connection fitting 21, bolt insertion holes 25 are opened through on the front and back, and aligned with the bolt insertion holes 25 in a state in which the arc-shaped plates 15 and 15 described above are drawn and connected. A screw hole 26 is formed at the position, and a bolt 27 for sewing is inserted into the bolt insertion hole 25, screwed into the screw hole 26, and tightened, thereby fixing the arc-shaped plates 15 and 15 and the arc-plate connecting bracket 21 to each other. doing.
Next, a mounting method and apparatus for the above-described pile-free welded joint will be described.

In this method, the arcuate plate 15 is straddled across the end fittings 12 and 12, and the arcuate plate is attracted to the end fitting 12 side with a magnetic force in a state in which both protrusions 13 and 13 are fitted in the groove 17. Use a holding device.

  As an example, this arc-shaped plate holding device uses a magnet block 30 having a structure shown in FIGS. The magnet block 30 includes a pair of yokes (yokes) 31 and 31 and a permanent magnet 32. The yokes 31 and 31 are overlapped via a nonmagnetic material layer 39 such as aluminum, and the yokes 31, A cylindrical magnet housing portion 33 is formed across 31 and an arcuate permanent magnet 32 whose both ends are in contact with the inner circumferential surface of the magnet housing portion 33 is rotated along the inner circumferential surface. So that it is housed.

  The permanent magnet 32 has one end on one yoke 31 and the other end on the other yoke from the position where one end of each of the permanent magnets 32 is excited to the N pole and the other is excited to the S pole. It can be reciprocally rotated by an angle between positions where it contacts only the iron 31, and can be operated by an operation lever 34 provided outside the magnet block 30.

  The suction surface 31 a of the first yoke 31 is in contact with the steel pipe 11 welded to the end fitting 12, and the suction surface 31 b of the other yoke 31 is directed to the outer surface of the arc-shaped interplate coupling fitting 21. To form.

  Further, the magnet block 30 is connected to a temporary fixing means 35 for removably fixing it to the arc-shaped plate 15. The temporary fixing means 35 has one end fixed to the magnet block 30 and the other end substantially perpendicular. The holding arm material 36 integrally includes bent piece portions 36a and 36b that are bent in the same manner, a fastening bolt 36 that is screwed to the bent piece portion 36a, and an elastic pad 37 that is fixed to the tip thereof.

  When using this apparatus, as shown in FIG. 1, the magnet block 30 is applied to the outer surface of the arc-shaped plate 15 to be attached to the joint portion by contacting one of the attracting surfaces 31b. A state in which the arc-shaped plate 15 is sandwiched by attaching the elastic plate 38 to the lower surface of the arc-shaped plate 15 by screwing the tightening bolts 37 so that the upper and lower surfaces of the arc-shaped plate 15 are sandwiched between the portions 36a and 36b. Thus, the magnet block 30 is temporarily fixed to the arc-shaped plate 15.

  At this time, the permanent magnet 32 in the magnet block 30 is set at a position where the N poles and S extremes at both ends are in contact with both the yokes 31 and 31 respectively. As a result, the lines of magnetic force pass only through the yokes 31 and 31 and do not cause an attractive force to act on the excitation material in the image area.

  In this state, the arc-shaped plate 15 is applied to a predetermined position of the joint, and the NS pole of the permanent magnet 32 is rotated by the operation lever 34 of the magnet block 30 so as to contact only the separate yokes 31 and 31 respectively.

  As a result, the attracting surfaces 31 a and 31 b are exemplified as the N pole and the S pole, and the lines of magnetic force pass through the arc-shaped plate 15, the end fitting 12, and the steel pipe 11, and the arc-shaped plate 15 exerts a magnetic force on the end fitting 12. It will be adsorbed by.

  After mounting each arc-shaped plate 15 in a state in which the arc-shaped plates 15 are attracted to the outer periphery of the end fitting 12 by a magnetic force, the adjacent arc-shaped plates 15 are connected by the arc-shaped plate connecting bracket 21.

  Thereafter, the operation lever 34 of the magnet block 30 is returned to the original state, the magnet block 30 is removed in a non-attraction state, the arc-shaped plate connecting metal fitting 21 is hit with a hammer, and the bolt insertion hole 25 is aligned with the screw hole 26. Then, the bolt 27 is inserted to fix the arc-shaped plate 15 and the arc-shaped plate-to-plate connecting fitting 21 to complete the joint mounting operation.

  In the above-mentioned example, the magnet block 30 is used to attract the arc-shaped plate 15 and the end fitting 12 of the pile by magnetic force. Magnetic system can be used.

DESCRIPTION OF SYMBOLS 10 Pile main body 11 Steel pipe 12 End part metal part 12a End plate part 12b Skirt part 13 Projection 15 Arc-shaped plate 16 Crevice 17 Groove 20 Arc-shaped inter-plate connection projection 20a Plate end side surface 20b Plate center side surface 21 Arc-shaped inter-plate connection metal fitting 22 Tapered dovetail groove 25 Bolt insertion hole 26 Screw hole 27 Bolt 30 Magnet block 31 yoke 31a, 31b Attraction surface 32 Permanent magnet 33 Magnet housing part 34 Operation lever 35 Temporary fixing means 36 Arm material for clamping 36a, 36b Bending piece part 37 Bolt 38 Elastic pad 39 Non-magnetic material layer

Claims (5)

A plurality of arc-shaped plates that are wound around the outer periphery of both ends of the joint end of each pile to be connected to each other and fitted in a winding arrangement are provided, and flange-like ridges are provided on the outer periphery of each end bracket. Provided integrally with a concave groove on the inner peripheral surface of the arc-shaped plate, and the convex ribs of the both end metal fittings fit into the arc-shaped plate. In the pile non-welded joint mounting method for connecting the piles by fitting the outer circumferences and connecting the arc-shaped plates between the arc-shaped plate connecting brackets,
Using an arc-shaped plate holding device using a permanent magnet, the arc-shaped plate holding device is attached to a predetermined position by attracting the arc-shaped plates to the end fittings by the magnetic force of the arc-shaped plate holding device. A pile non-welded joint mounting method characterized by mounting an arc-shaped plate-to-plate connection fitting and then removing the arc-shaped plate holding device. The arcuate plate-to-plate connecting bracket has a tapered dovetail with a narrow taper on either the upper or lower side and a dovetail shape in cross section,
On the outer surface of each end portion of the arc-shaped plates adjacent to each other, each is provided with a projection for connecting between the arc-shaped plates in a shape obtained by vertically dividing a tapered dovetail that fits into the tapered dovetail groove,
The pile non-welded joint mounting method according to claim 1, wherein the arcuate plates are connected to each other by fitting the tapered dovetail grooves to the arcuate plate-to-plate connection projections.   3. The arcuate plate-to-plate connection fitting is mounted by fitting the tapered dovetail groove to the arc-shaped plate-to-plate connection projection, and then screwing both ends of the arc-shaped plate-to-plate connection fitting to the adjacent arcuate plates. The pile non-welded joint mounting method described.   A magnet block that includes a permanent magnet rotatably accommodated therein, and that can be switched between adsorption and non-adsorption by magnetic force by rotation of the permanent magnet, and a temporary block that detachably fixes the magnet block to the arc-shaped plate. The pile non-welded joint arc-shaped plate holding device used for the method according to any one of claims 1 to 3, comprising a fixing means.   The pile-less welded joint arc-shaped plate holding device according to claim 4, wherein the temporary fixing means is a clamping tool that is fixed to an outer box of a magnet block and elastically sandwiches the arc-shaped plate.

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