JP4178277B2 - Ready-made pile protection socket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides a protective socket for preventing damage to the lower end portion of a ready-made pile when the ready-made pile placed on the ground is suspended by a pile driver or a crane.ToRelated.
[0002]
[Prior art]
  When building foundation piles using ready-made piles, the ready-made piles manufactured at the factory are transported to the construction site with a trailer, etc. They were placed side by side. At the time of construction, the ready-made pile placed on the ground is transported to the construction position of the pile and construction is performed.
[0003]
  Generally, at the stage of building a pile, there is no fixed large crane installed at the construction site, so a pile driver is used as a method of transporting the ready-made pile from the storage location of the ready-made pile to the construction site of the pile. There is also a method of moving the pile driver to the construction position while moving to the storage location of the ready-made piles and hanging the ready-made piles. It was bad.
[0004]
  Therefore, let the pile driver stand by near the construction site and wire the ready-made pile.-In addition, a method of moving a ready-made pile to a position where it can be handled by a pile driver using a mobile crane, a power shovel, a backhoe, or the like is also employed.
[0005]
  In addition, when arranging, for the purpose of preventing cracking of the pile due to its own weight, laying squares etc. on the ground in a predetermined position, arranging ready-made piles on the squares, wire-It was stored so that it was easy to pass. At this time, in addition to floating the whole from the ground, it was stored obliquely so that the suspended side floated from the ground.
[0006]
[Problems to be solved by the invention]
  In the conventional method, when the ready-made pile is lifted and moved, depending on the moving distance, considering the construction efficiency and the like, the lower end side is often moved while being dragged on the ground. Damage to the concrete could occur.
[0007]
  In particular, recent support piles tend to have larger diameters (for example, more than 1 m), and tend to be longer (some are about 10 m), so the weight is also about 10 tons, which is a small and medium-sized mobile type. It was difficult to lift with a crane or the like, and there was a situation in which it was necessary to drag on the ground.
[0008]
  In addition, in order to increase the supporting force, a support pile having a protrusion at the lower end is also implemented, and the protrusion is formed with a larger diameter than the shaft, so that the protrusion is dragged when suspended. There is a problem that the protrusions are cracked or chipped.
[0009]
  In addition, there has been a ready-made pile having a protruding portion over the entire length including a lower end called a so-called knot pile, but the so-called knot pile is mainly used as a friction pile in improved ground, and has a shaft portion diameter. (About 40cm), length (less than 10m), weight (several tons) and low weight, so it can generally be lifted and transported by small and medium-sized cranes, etc.ZHowever, there was little risk of large defects. Therefore, as long as the conventional so-called knot piles are handled,ButIt was relatively easy to avoid.
[0010]
[Means for Solving the Problems]
  However, in this invention, since the protective socket is configured to be detachable at the lower end of the ready-made pile, even if the lower end of the pile is dragged when the ready-made pile is suspended by a pile driving machine, a crane, or the like.PileYou can avoid damaging your body,PileThe body was protected and the above problems were solved.
[0011]
  That is, the invention of the protective socket is a ready-made pile made of concrete having a protruding portion on the outer surface of the lower end portion, the protruding portion being formed with a diameter larger than the shaft portion, and the protruding portion is fixed to the root portion of the pile hole. Ready-made piles to be usedA protective socket of
(1) Of the ready-made pileA cylindrical body that protects the shape of the protrusion.,in frontA shape that can be locked and attached to the protrusion,AndAt least the lowest projection of the ready-made pilePartHas a length to coverTo the cylindrical body,
(2)It is an edge of the cylindrical main body, and is substantially the same diameter as the outer diameter of the cylindrical main body, or an end edge on the side located at the lower end of the ready-made pile.From the outer diameter of the cylindrical bodyIt is a ready-made pile protective socket characterized by having a large-diameter and annular or disk-like holding board.
[0013]
  Further, in the above, the cylindrical main body is composed of two cylindrical main body pieces that are halved along the axial direction, and the flanges of both cylindrical main body pieces are configured to be detachably fixed to each other. It is a protection socket of a ready-made pile.
[0014]
  In the above,AlreadyPileUnderA plurality of bolt holes are formed in a cylindrical main body having an inner diameter capable of covering an end portion, and a tip of a bolt screwed into the bolt hole can be brought into contact with an outer surface of the ready-made pile. The bolt is disposed at a position where the protruding portion of the ready-made pile can be locked.
[0016]
  The “cylindrical main body” in the above includes various types of cylinders such as a front circular shape and a quadrangular shape, as well as a partial cylindrical shape such as a front semicircular shape and a “quarter” circular shape. In the case of a partially circular cylindrical main body such as a semicircular shape, a locking means such as a belt is used on the open side.
[0017]
  Moreover, in the above, "pile driver etc." refers to the apparatus used when hanging ready-made piles, such as a pile driver and a crane.
[0018]
  The present invention can be applied to either a cylindrical ready-made pile or a ready-made pile having protrusions on the outer surface. Moreover, a protrusion here refers to the part of the convex side in case the recessed part or convex part is formed with the ready-made pile which the outer diameter is changing in the length direction (axial direction). That is, in the case of a ready-made pile whose outer diameter is changing in the length direction (axial direction), a step is generated between the surface of the surrounding pile due to the change of the outer diameter, and the same can be applied to the step portion. .
[0019]
  If the ready-made pile to be applied is a cylindrical ready-made pile with no protrusion at the lower end, means such as a protective socket to protect the ready-made pile are usually unnecessary, and there is a special concern that the ready-made pile may be deformed or damaged. Only used if. In order to ensure the prevention of the protective socket from coming off and the impact prevention, an elastic body or cushioning protrusion with an appropriate thickness is formed inside the socket, and when the protective socket is fixed to the ready-made pile, the protective socket It is desirable to press and fix the inner surface side of the.
[0020]
  In addition, as in the case of conventional so-called knot piles, when annular protrusions are formed over the entire length of the ready-made pile and the peripheral frictional force from the entire formation is used, some of the annular protrusions are damaged. However, the effect on the bearing capacity of the entire pile foundation is practically small.
[0021]
  However, when the outer diameter changes in the axial direction of the pile due to an annular protrusion such as a reinforcing bar structure, spiral shape or concrete nodal shape, etc. on the lower end which is a part of the ready-made pile, that is, When a stepped portion whose outer diameter gradually changes in a slope shape or a stepped portion whose outer diameter changes suddenly in a right angle shape is formed, a solid cement with high solidification strength is filled in the expanded bottom portion formed in the pile hole. In some cases, an already-prepared pile is embedded so that irregularities (stepped portions) such as annular projections are located in the expanded bottom-solidified portion. In this case, by placing and sinking this annular projection in the bottom-flooded root-filled portion filled with high-solidifying strength soil cement, it is possible to exert a supporting force about twice as high as usual, Deformation has a great influence on the supporting force and the like, and construction management is important so that the annular protrusion is not damaged or deformed. Therefore, in the case of such a ready-made pile, the advantage of applying the protective socket or the hanging method of the present invention is strongly exhibited.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  The present invention provides a protective socket by providing a cylindrical main body having an inner diameter capable of covering the lower end portion of a ready-made pile with an attaching / detaching means for the ready-made pile.
[0023]
  When the cylindrical main body is divided into two parts in the axial direction and joined by a flange as attachment / detachment means, the flange is strongly tightened if the inner diameter of the cylindrical main body is substantially the same as the maximum outer diameter of the ready-made pile. Thus, the protective socket can be attached in close contact with the ready-made pile. In addition, when the inner diameter of the cylindrical main body is sufficiently larger than the maximum outer diameter of the ready-made pile, a cushioning material such as rubber is applied to the entire inner surface of the cylindrical main body in a ring shape in the circumferential direction and in a streak shape along the axis. Alternatively, by providing them in a scattered manner, they can be adhered and locked in the same manner.
[0024]
  In addition, when the protrusion etc. are formed in the surface of the ready-made pile, it is necessary to select so that it may be set as the cushioning material of the thickness and the intensity | strength which does not deform the protrusion.
[0025]
  In addition, as a means for attaching and detaching, a cylindrical main body is formed from a steel pipe having an inner diameter sufficiently larger than the maximum outer diameter of the ready-made pile, a bolt is passed through toward the center of the cylindrical main body, and the bolt is tightened and locked to the ready-made pile. It is also possible to adopt a configuration that This configuration is mainly effective in the case of a ready-made pile with a protrusion.
[0026]
  In addition, using only one of the half-cylindrical bodies obtained by dividing the cylindrical main body into two in the direction along the axis, the cylindrical main body is similarly provided with an attaching / detaching means with the ready-made pile, and the lower end half surface of the ready-made pile is used. It can also be configured as a protective socket that covers a specific outer surface such as.
[0027]
  Further, the predetermined length L of the protective socket 10 in the above₁As for (Fig. 1 etc.), when considering the lifting height H (Fig. 4) of the ready-made pile at the time of lifting and moving the ready-made pile, and the dimension of dragging the ground during the lifting from the range of variation in actual work, etc. It is desirable to secure at least a range of about twice or more the maximum outer diameter of the ready-made pile. Also, the predetermined length L₁When a protrusion (mainly contributing to the support force) is formed at the lower end of the ready-made pile, a length that can cover at least one protrusion from the lower end of the ready-made pile is secured. If it has, the protection of the shape of the ready-made pile by the protection socket 10 will be implement | achieved reliably.
[0028]
  In addition, in the ready-made pile to be lifted and moved, the most easily damaged portion at the time of moving is the protruding portion of the ready-made pile, that is, the large diameter side of the stepped portion that changes so that the outer diameter is larger than the surroundings. Therefore, it is important to securely protect this part.
[0029]
  Also protective socketTheWhen a large amount can be prepared, a protective case can be attached to a ready-made pile arranged around the ready-made pile to be moved without attaching a protective socket to the ready-made pile to be lifted. In this case, since it is necessary to mount the protective socket so as to protect the lower surface of the protruding portion, a protective socket that covers the entire protrusion is effective.
[0030]
  Moreover, a protective socket can be attached to both the ready-made pile to be lifted and the surrounding ready-made pile.
[0031]
[Example 1]
  An embodiment of the present invention will be described with reference to FIGS.
[0032]
[1] Configuration of protective socket 10
[0033]
  Maximum outer diameter D of the lower end of the ready-made pile to be used₀Larger inner diameter D₁, Length L₁The steel pipe 1 having the above is divided in half in the axial direction, and joining flanges 4 and 4 are continuously provided along both cutting lines 3 and 3 of the steel pipe pieces 2 and 2 having a semicircular cross section. Through holes 5 and 5 are formed in the flange 4 to form cylindrical main body pieces 6 and 6. Cushion materials (such as various synthetic rubbers) 7 and 7 are fixed to the inner surface of the cylindrical body piece 6.
[0034]
  Two cylindrical body pieces 6, 6,The flanges 4 and 4 are combined, and the bolts 8 are inserted into the communicating through holes 4 and 4, and the nuts 9 are screwed and fastened to fix the two cylindrical body pieces 6 and 6. Configure (FIGS. 1A and 1B).
[0035]
  Steel pipe 1 has an outer diameter D of ready-made pile₀= If it is about 600mm,
Length L₁= 2m
Inner diameter D₁= About 630mm (Outer diameter is about 650mm)
To form.
[0036]
  In addition, in consideration of attachment / detachment efficiency and reliability, two through holes 5 are usually formed for each flange, but may be one or three or more.
[0037]
[2] Construction of ready-made piles
[0038]
(1) Cylindrical piles (PHC piles, PRC piles, SC piles, etc.) 20 and 20 as piles transported by a trailer from the factory are storage places inside and outside the site of the construction site. Placed in parallel and floating from the ground 40. At this time, they are arranged using a crane or the like (FIG. 2).
[0039]
(2) One cylindrical body piece 6A of the protective socket 10 is attached to the lower end portion of the prefabricated pile on the lower end portion (opposite side to the hanging side) 21 of the cylindrical piles 20, 20 placed on the square members 41, 41. Place the inner surface up on the lower ground 41. Next, another cylindrical main body piece 6 </ b> B with the inner surface facing downward from above is placed on the lower end portion of the cylindrical pile 20.
[0040]
  Next, the cylindrical main body piece 6A placed on the ground is lifted, the flanges 4 and 4 of both the cylindrical main body pieces 6A and 6B are aligned, the bolts 8 are inserted from below into the communicating through holes 5 and 5, and the nut 9 is inserted. The two cylindrical main body pieces 6A and 6B are connected by screwing.
[0041]
  At this time, because the cushion materials 7 and 7 are fixed to the inner surfaces of the cylindrical body pieces 6A and 6B, the cushion material 7 is interposed between the inner surfaces of the cylindrical body pieces 6A and 6B and the outer surface of the cylindrical pile 20, The inner surfaces of the cylindrical main body pieces 6A and 6B do not come into contact with the cylindrical pile 20, the outer surface of the cylindrical pile can be wrapped flexibly, and even when an impact is applied to the protective socket 10, the impact is absorbed. it can.
[0042]
(3) Next, when the cylindrical pile 20 is used, the wire 29 is wound around the upper end portion (hanging side) of the cylindrical pile 20, and the end of the wire 29 is hung on the hook 28 of a small lifting device or the like. Then, the upper end portion 21a of the cylindrical pile 20 is lifted (FIG. 4A). With a crane vehicle, the cylindrical pile 20 is pulled out, transported to the construction position of the cylindrical pile 20 where the pile driving machine 30 stands by, and laid down on the ground 40 at a predetermined position. On this occasion. Since the small lifting device is easy to turn, the cylindrical piles 20 and 20 can be efficiently lifted and conveyed.
[0043]
  At this time, the lower end 21 side of the cylindrical pile 20 is on the ground and may be dragged. However, since the protective socket 10 does not receive an impact from the ground 40 or the adjacent cylindrical pile 20 or the like, The cylindrical pile 20 itself is not damaged, and the lower end portion 21 of the cylindrical pile 20 can be protected.
[0044]
(4) At the construction position, the pile pile machine 30 is supported by the pile driving machine 30 with the suspension wire 29 of the cylindrical pile 20 that is carried sideways and placed on the ground 40, and the upper end portion 21a of the cylindrical pile 20 is The pile holding cap 32 is fitted into a pile holding cap 32 below the auger 31 (FIG. 4B). At this time, the lower end 21 side of the cylindrical pile 20 is slightly dragged. Similarly, the lower end 21 of the cylindrical pile 20 can be protected by the protective socket 10.
[0045]
  Thereafter, the cylindrical pile 20 is held vertically by the pile driving machine 30, and the cylindrical pile 20 is positioned above the pile hole 34 excavated prior to the suspension of the cylindrical pile 20. Next, the bolts 8 and 8 of the protective socket 10 fixed to the lower end portion 21 of the cylindrical pile 20 are removed, and the cylindrical main body pieces 6A and 6B are separated and removed (FIG. 4C).
[0046]
(5) Subsequently, the cylindrical pile 20 is inserted into the pile hole 34 and the cylindrical pile 20 is laid down in the same manner as the construction of the normal cylindrical pile 20. At this time, if the lower pile already exists in the pile hole 34, the upper end of the lower pile and the lower end of the cylindrical pile 20 are connected.
[0047]
  Even when a large number of cylindrical piles 20 and 20 are connected, when the respective cylindrical piles 20 are suspended, if the protective socket 10 is attached to the lower end portion of each cylindrical pile 20 and the operation is performed, the cylindrical piles 20 are surely secured. , 20 can be protected.
[0048]
[3] Other embodiments
[0049]
(1) In the said Example, the outer diameter D larger than a steel pipe outer diameter in the lower end part 21 of the protection socket 10 from the convenience of the condition of a construction surface and insertion.₂It is also possible to fix a rigid holding disc 12 having a hollow or closed disc shape having a solid line (shown by chain lines in FIGS. 1A and 1B). The holding cylinder 12 may be made of a material having cushioning properties such as rubber as necessary.
[0050]
  Moreover, in the said Example, the volt | bolt 8 or the nut 9 can also be attached in the state previously latched to the flanges 4 and 4 (not shown). In this case, the screwing operation of the nut 9 or the bolt 8 can be simplified.
[0051]
(2) In the above embodiment, the small lifting device is used. However, when the storage place of the pile and the construction place (standby place of the pile driving machine) are close, the pile hanging hook 33 of the pile driving machine 30 is directly connected. It can also be hooked up with the wire 29 of the cylindrical pile 20 and lifted. Even in this case, the cylindrical pile 20 is carried obliquely to the vicinity of the pile driving machine 30 with the lower end 21 being on the ground 40, but the lower end 21 of the cylindrical pile 20 can be similarly protected by the protective socket 10. .
[0052]
  The mounting of the protective socket 10 to the cylindrical pile 20 is optional at the time of factory shipment, at the time of delivery at the site, when arranged in a storage place, immediately before construction.
[0053]
[Example 2]
  In this embodiment, an example in which a ready-made pile 22 with a protrusion 25 is used is shown (FIG. 5).
[0054]
[1] Configuration of protective socket 10
[0055]
  Maximum outer diameter (usually the largest protrusion) D of the lower end of the ready-made pile used₀Larger inner diameter D₁, Length L₁The two circumferential positions in the axial direction of the steel pipe 1 having (from the lower end 1a of the steel pipe 1 to L₂, L₃Bolt holes 15 and 15 are formed at positions 14 and 14a, respectively, to form a cylindrical main body 16. Length L₁In order to secure the protective socket, the mounting strength of the protective socket, and the protection of the ready-made pile, at least the length that covers the lowermost protrusion of the ready-made pile is required. The length covering the above protrusions is more desirable for certainty. Bolt holes 15 and 15 are formed at four positions at equal intervals in each of the circumferential positions 14 (14a).
[0056]
  A rigid circular holding plate 12 is fixed to the lower end 1a of the steel pipe 1 of the cylindrical body 16, and the bolt holes 15 and 15 of the cylindrical body 16 are directed from the outside toward the center of the cylindrical body 16. The bolts 17 and 17 are screwed together to form the protective socket 10 (FIGS. 1B and 1C).
[0057]
The ready-made pile 22 with a projection used for carrying out the present invention is
Pile length 10m,
Outer diameter of lower shaft part 23 600mm
700mm outer diameter of upper shaft part 24
The diameter of the protrusion 25 is 750 mm (= D₀)so,
A first protrusion 25A, a second protrusion 25B, and a third protrusion 25C are provided at positions 500 mm, 1500 mm, and 2500 mm from the tip 23a of the lower shaft part 23, respectively, and the upper shaft part continues from the second protrusion 25B. 24, a lower shaft portion 23 is formed (FIG. 5A).
[0058]
  When using the ready-made pile 22 with this protrusion,
Maximum diameter D of lower end of ready-made pile 22₀= 750 mm.
[0059]
  In this case, for example,
Length L of steel pipe 1₁= 2m, inner diameter D₁= 800mm,
Distance to circumferential position 14, 14a
L₂= 700mm,
L₃= 1700mm
And set. The diameter D of the holding board 12₂Is approximately the same diameter as the steel pipe or slightly larger diameter, and it is properly used depending on the situation of the construction site.
[0060]
[2] Built-in piles 22
[0061]
(1) The ready-made piles 22 with the standard-shaped protrusions are carried into the construction site in the same procedure as in the first embodiment, and are juxtaposed on the square members 41, 41 at the storage position in a state of floating from the ground. (FIG. 5 (a)).
[0062]
(2) Cover the protective socket 10 from the lower end (opposite side to the hanging side) 23a of the ready-made pile 22 with projections placed on the square member 41 (FIG. 5B).
[0063]
  The protective socket 10 is disposed so that the bolt holes 15 and 15 of the protective socket 10 (steel pipe 1) are positioned on the upper side of the first protruding portion 25A and the upper side of the second protruding portion 25B of the ready-made pile 22, respectively. Bolts 17 are respectively screwed into the bolt holes 15 and 15 and hooked on the upper side of the protrusions of the ready-made pile 22. When the bolts 17 are inserted into the upper and lower bolt holes 15, 15, the bolts 17, 17 are hooked on the first protrusion 25 A and the second protrusion 25 B, and the ready-made pile 22 is lifted, the protective socket 10 is It is prevented from falling (FIG. 5 (c)).
[0064]
  Moreover, since the clearance gap between the upper end side inner surface of the steel pipe 1 of the protective socket 10 and the outer surface of the ready-made pile 20 arises, in order to prevent the ready-made pile 22 from moving (shaking) within the steel pipe 1, the upper end 1b of the steel pipe 1 is Between the inner surface and the outer surface of the ready-made pile 22, cushioning materials 18 and 18 made of wood having a triangular cross section are inserted into two symmetrical positions. As described above, the protective socket 10 is attached to the ready-made pile 22 with the protrusions (FIG. 5D).
[0065]
  If the protruding portion has a shape that easily deforms, the protective socket cannot be locked by the protruding portion. Therefore, a rubber material or the like that also has a non-slip adhesion function is used as the buffer material 18 for the purpose of fixing the protective socket. In use, it is necessary to select a shape and material having a thickness and strength to protect the protrusion.
[0066]
(3) Next, when constructing the ready-made pile 22 with the protective socket attached and covered at the lower end, the wire 29 is wound around the upper end of the ready-made pile 22 with the protrusion, as in Example 1. The pile hanging hook 33 of the pile driving machine 30 is connected to the wire-It latches to 29 and the ready-made pile 22 is lifted (FIG. 6 (a)).
[0067]
  When pulling up the upper end of the ready-made pile 22 with projections and pulling the ready-made pile 22 toward the pile driver 30 side, the lower end of the ready-made pile 22 will be dragged, but the protective socket 10 is attached to the lower end. Therefore, the ready-made pile 22 itself, in particular, the protrusions 25 and 25 are not damaged.
[0068]
  Further, since a holding board 12 having a diameter substantially equal to or slightly larger than the outer diameter of the steel pipe 1 is fixed to the lower end 1a of the steel pipe 1 of the protective socket 10, the side surface of the steel pipe 1 is not dragged. Since the holding board 12 is dragged, the ready-made pile 22 can be further prevented from being damaged.
[0069]
  After the upper end of the lifted ready-made pile 22 is fitted to the pile holding cap 32 at the lower part of the auger 31 of the pile driving machine 30, the ready-made pile 22 is grounded on the ground 40 (FIG. 6B). Subsequently, the bolts 17 and 17 of the protective socket 10 are removed, and the ready-made pile 22 is pulled up. At this time, the buffer members 18 and 18 inserted on the upper end 1 b side of the steel pipe 1 fall off simultaneously with the pulling of the ready-made pile 22. Subsequently, the ready-made pile 22 is pulled up, and the protective socket 10 is pulled out from below.
[0070]
(4) Then, the ready-made pile 22 is moved to the pile hole position excavated prior to the suspension of the ready-made pile 22 and inserted into the pile hole 34 (FIG. 6C).
[0071]
  Thereby, since it is formed in the outer surface of the lower end of a ready-made pile, it can protect the projection parts 25 and 25 of the ready-made pile 22 with the projection part which is easy to receive damage, The protrusions 25 and 25 that play an important role in the frictional force can be embedded in the pile hole 34 in a healthy state.
[0072]
[3] Other embodiments
[0073]
(1) In the above-described embodiment, one bolt hole 15 is provided at four locations at the circumferential position 14 (14a). However, if at least three locations are provided at approximately equal intervals, the prepared pile 22 is protected at a predetermined position. Since the socket 10 can be held, the number of the bolt holes 15 is not limited as long as the socket 10 is formed in at least three places (not shown).
[0074]
  Moreover, in the said Example, although the position of the volt | bolt 17 (bolt hole 15) was made into the upper side of the two protrusion parts 25B and 25C of the ready-made pile 22, if the protection socket 10 does not fall from the downward direction of the ready-made pile 22 It can also be provided at other positions. For example, “upper side and lower side across one protrusion 25A (25B)” “upper side of first protrusion 25A and lower side of second protrusion 25B” “lower side of second protrusion 25A and second protrusion It can also be disposed on the upper side of the portion 25B (not shown).
[0075]
  Further, the bolt hole 15 (bolt 17) can be formed at one circumferential position 14 (14a) on the upper side of one of the protrusions 25 of the ready-made pile 22 (not shown). From the viewpoint of the position of the stopper and the certainty, it is desirable to form it at two locations, the upper and lower circumferential positions 14, 14a.
[0076]
  In addition, a large number of bolt holes 15 are formed corresponding to the positions of the projections 25 of the plurality of types of ready-made piles 22 to be used, and the bolt holes 15 and 15 are selected and used according to the ready-made piles 22 to be used. Then, the bolts 17 and 17 can be screwed together (not shown).
[0077]
  Moreover, although the bolt 17 and the bolt hole 15 were used in the said Example, instead of using fastening parts, such as a through-hole and a pin, a pin etc. can also be inserted in a through-hole (not shown). . The combination of the through hole and the pin is desirable from the viewpoint of maintenance and workability of the bolt hole (through hole).
[0078]
(2) Further, in the above-described embodiment, one end of the half-divided (frontal semicircular) steel pipe piece 2 is closed with the semicircular plate 26 to form the cylindrical main body 6, and the elastic body projects on the inner surface on the other end side. It is also possible to provide a protective socket 10 by attaching a belt (detachment means) 36 to the opening above the elastic body (FIG. 7). In this case, the protective socket 10 is placed on the lower side of the lower end portion of the ready-made pile 22 arranged horizontally on the square member 41 to cover the lower side of the protruding portion 25, and the elastic body 27 is ready-made. Abutting on the shaft portion of the pile 22, the belt 36 is rotated around the shaft portion, and the protective socket 10 is attached (FIGS. 7A to 7C). At this time, since the belt 36 is disposed in the vicinity of the protrusion 25 and on the side far from the tip of the ready-made pile 22, there is no possibility that the protective socket 10 is detached from the ready-made pile 22 by being locked to the protrusion 25 (FIG. 7 (a) (b)).
[0079]
  Moreover, in this case, the cylindrical main body 6 can be formed from the steel pipe piece 2 that covers the entire two protrusions 25, 25, and the protective socket 10 can be configured (FIG. 8).
[0080]
(3) Moreover, in the said Example, although the cylindrical main body 6 was comprised from the steel pipe 1 or the steel pipe piece 2, it can also form in the same shape from other materials, such as a wood material. The same applies to the first embodiment.
[0081]
  For example, the cylindrical main body 6 can also be comprised from tires 43, such as a vehicle (FIG. 9). Moreover, since tires have various diameters, they can be appropriately selected and used.
[0082]
If the tire 43 is a used old tire, the waste can be reused, so that the cost is not required and the environment can be saved. Moreover, since the tire 43 is lightweight, it can be easily attached to and detached from the ready-made pile.
[0083]
  In this case, a part of the tire 43 is cut away to form the cylindrical main body 6, and belts (detachment means) 44 and 44 are attached to constitute the protective socket 10 (FIG. 9C). In this case, it is desirable to put a cushioning material inside the tire 43 (not shown). The protective socket 10 is twisted and inserted into the shaft portion of the ready-made pile 22 laid horizontally on the square members 41, 41, and the belts 44, 44 are tied around the shaft portion to attach the protective socket 10 (FIG. 9B). ). In this case, if it attaches between the projection parts 25 and 25, it will latch to the projection part 25 and there is no possibility that the protection socket 10 may remove | deviate. Since the protective socket 10 is formed with a notch, it can accommodate many types of ready-made piles 22.
[0084]
  Moreover, when attaching to the front end side from the projection part 25 of the ready-made pile 22, here, the belts 44 and 44 are latched straddling the projection part 25 (FIG.9 (d)). Further, the protective socket 10 can be put on the protrusion itself to be locked (FIG. 9 (a), shown by a chain line 10).
[0085]
  Here, the belt 44 is used as the attaching / detaching means, but other materials such as bolts may be used (not shown).
[0086]
  Moreover, the protective socket 10 can be comprised from the tire 43 itself, and can also be elastically fitted by the front-end | tip part of the ready-made pile 22 (FIG.9 (b)). In this case, the elastic force of the tire 43 constitutes the attaching / detaching means.
[0087]
  Also apply protective socket 10RushThe raising portion 25 can be applied to either the protruding portion 25a having a short axial length or the protruding portion 25b having a long axial length (FIG. 11). In particular, when the long protrusion 25b is formed on the lower end side of the ready-made pile 22, the protective socket 10 can be attached only to the formed step portion 38 (FIG. 11A). Alternatively, the protective socket 10 can be attached to the entire portion including the step portions 38a and 38a of the protrusion portion 25 on the distal end side together with the step portion 38 of the protrusion portion 25b (FIGS. 11B and 11C).
[0088]
(4) Moreover, in the said Example, it applies to the ready-made pile 22 (FIG.10 (a)) which has the screw hole 51,51 for attachment in the bottom of the annular recessed part 50 for connection and the annular recessed part 50 in the end plate 49. FIG. The protective socket 10 will be described.
[0089]
  In this case, a protrusion 47 that can be fitted into the annular recess 50 is provided on the inner side of the rubber band substrate 45, and protrusions 47 and 47 corresponding to the screw holes 51 of the ready-made pile 22 are provided on the inner surface of the protrusion 47. A protective socket 10 is formed (FIG. 10B). The rubber band base material 45 has a length L corresponding to the outer circumferential length of the ready-made pile 22.₄Have Moreover, the rubber band base material 45 is easy to attach if it is curved with the ridge 46 inside and formed into a cylindrical shape.
[0090]
  The protective socket 10 is attached to the annular recess 50 while inserting the protrusions 47 and 47 into the screw holes 51 and 51 while being wound around the annular recess 50 of the ready-made pile 22 (FIG. 10C). ). In this way, a cylindrical protective socket is formed. By using this protective socket 10, the ready-made pile 22 can be protected, and the screw hole 51, which normally requires curing, is covered with the protective socket 10.
[0091]
  The protective socket 10 can be applied regardless of the presence or absence of the projecting portion 25 as long as it is a ready-made pile having an annular recess 50 for connection on the end plate 49 and screw holes 51, 51 for attachment on the bottom of the annular recess 50. Yes (not shown).
[0092]
(5) Moreover, in the said Example, the ready-made pile 22 which has a projection part is not restricted to the said structure. For example, it can also be set as the ready-made pile with the projection part which formed the projection part 25 in the axial part of the same diameter over the full length at predetermined intervals over the full length (not shown).
[0093]
【The invention's effect】
  In a ready-made pile placed on the ground, when a wire is wound around the upper end of the ready-made pile and pulled or lifted by a crane, pile driver, etc., the lower end of the ready-made pile is protected with a protective socket. Therefore, even if the ready-made pile collides with other ready-made piles in parallel, hits the ground, hits obstacles such as stones and excavator, In particular, the joint portion can be prevented from being damaged. Also, if the lower end of the ready-made pile is covered with a protective socket, the joint at the lower end will inevitably be protected, and mud can be prevented from adhering to the joint, and cleaning work when welding the ready-made pile is connected. There is an effect that can be simplified.
[0094]
  Also, since the mounting and dismounting work of the protective socket is necessary separately from the construction work of normal ready-made piles, it is desirable to use as few protective sockets as possible, so normally only the ready-made piles to be lifted (transferred) By applying to the above, a great effect can be expected with less work. The protective socket can also be applied to a ready-made pile placed on the ground, not around the ready-made pile to be lifted, but around the ready-made pile to be lifted. In this case, it is effective to protect the stepped portion which is a part of the protruding portion in addition to the case where the protruding portion itself is covered with the protective socket. Further, if the length of the protective socket is adjusted, for example, by adjusting the length of the protective socket, both the protruding portion and the stepped portion can be protected, and an effective ready-made pile can be protected.
[0095]
  In particular, in the case of a ready-made pile with a protruding portion, when the lifting portion is lifted by a crane or the like, the protruding portion that contacts the ground is protected by a protective socket, so that there is an effect of preventing the protruding portion from being cracked or broken.
[0096]
  That is, a protrusion or the like is formed at the lower end of the ready-made pile, and particularly when the shape is not a simple cylindrical shape but is easily deformed, it is effective for protecting the shape.
[Brief description of the drawings]
1A is a plan view of Example 1, FIG. 1B is a front view of the same, FIG. 1C is a plan view of Example 2, and FIG.
FIG. 2 is a perspective view showing a state in which ready-made piles are arranged at a storage position in the first embodiment.
3A is a front view of a part of a ready-made pile at a storage position, and FIGS. 3B to 3C are front views illustrating a procedure for mounting a protective socket. FIG.
FIGS. 4A to 4B are front views for explaining a process up to mounting of a ready-made pile from a storage position to a pile driving machine in Embodiment 1. FIGS.
5A is a partial front view of a ready-made pile at a storage position, FIG. 5B is a partial front view of a state in which a protective socket is disposed, and FIG. The partial front view which cut off the protective socket, (d) is the Example which used the shock absorbing material, and represents the partial front view which cut off the protective socket after mounting | wearing a protective socket.
FIGS. 6A and 6B are front views for explaining a process up to mounting of a ready-made pile from a storage position to a pile driving machine in the second embodiment.
7A is another embodiment of the present invention, and FIG. 7B is a front view showing a state in which a protective socket is attached to a ready-made pile, FIG. 7B is a front view in which only the protective socket is broken, and FIG. It is -A sectional drawing.
FIG. 8 is a front view in which only the protective socket is broken in a state where the protective socket is attached to the ready-made pile in another embodiment of the present invention.
FIG. 9C is a plan view of another protective socket according to the present invention, and FIGS.
10A is a front view of a ready-made pile used in another embodiment of the present invention, FIG. 10B is a front view in the middle of attaching a protective socket to the ready-made pile, and FIG. 10C is a front view of the ready-made pile. It is a front view of the attached state.
11 (a) to 11 (c) are front views of an embodiment of another ready-made pile with the protective socket of the present invention attached thereto.
[Explanation of symbols]
1 Steel pipe
1a Lower end of steel pipe
1b Upper end of steel pipe
2 Steel pipe pieces
3 Steel pipe cutting line
4 Flange
5 through holes
6 Cylindrical body piece
7 Cushion material
8 volts
9 Nut
10 Protective socket
12 Holding board
12a Holding disc
13 Opening of holding board
14, 14a Circumferential position
15 Bolt hole
16 cylindrical body
17 volts
18 cushioning material
20 Cylindrical pile (off-the-shelf pile)
21 Lower end of cylindrical pile
22 Ready-made piles with protrusions
23 Lower shaft part of ready-made pile
24 Upper shaft of ready-made pile
25, 25A, 25B, 25C, 25a, 25b Protrusion of ready-made pile
29 wires-
30 Pile driver
34 Pile hole
36 belts
38, 38a Stepped part
40 ground
41 Square lumber
43 tires
44 Belt
45 Rubber band substrate
46 ridges
47 Protrusions
50 Annular recesses in ready-made piles
51 Screw holes in ready-made piles

Claims (3)

A ready-made pile having a protruding portion on the outer surface of the lower end, the protruding portion being made of concrete having a diameter larger than that of the shaft portion, and being used by positioning the protruding portion at the rooted portion of the pile hole A protective socket of
(1) the ready-made shape of the protrusion of the pile a cylindrical body for protecting the front Symbol a shape that can be attached engaged with the protrusion, and at least the lowermost projection of the ready-made pile the tubular body to have a length that covers,
(2) It is an edge of the cylindrical main body, and the end edge on the side located at the lower end of the ready-made pile is substantially the same diameter as the outer diameter of the cylindrical main body or larger than the outer diameter of the cylindrical main body. Protective socket for ready-made piles having a diameter and having an annular or disk-shaped holding board connected continuously.   The cylindrical main body is composed of two cylindrical main body pieces divided in half along the axial direction, and the flanges of both cylindrical main body pieces are detachably fixed to each other. Ready-made pile protective socket as described.   A plurality of bolt holes are formed in a cylindrical main body having an inner diameter capable of covering the lower end of the ready-made pile, and the tip of the bolt screwed into the bolt hole can be brought into contact with the outer surface of the ready-made pile. 2. The ready-made pile protective socket according to claim 1, wherein the plurality of bolts are arranged at positions where the protruding portions of the ready-made pile can be locked.

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