JP2016003444A - Parting member and pile head treatment method for on-site constructed pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parting member and a pile head treatment method for an on-site constructed pile that facilitate demolition of excess concrete.SOLUTION: A parting member 1 has a plurality of slits at a prescribed interval on a surface 3 of a mat-like body 2 formed of a stretchable material. A cage 35 made of reinforcing bars and having the parting member 1 fitted in a circumferential direction is inserted into a hole 39 excavated into a ground while holding an upper part of a main reinforcement 37 in a slit, and concrete is cast for constructing an on-site constructed pile 29. Then, concrete at an outside part 41 of the parting member 1 is removed, the concrete being a part of excess concrete 33 at a pile head of the on-site constructed pile 29, and the parting member 1 is removed from the cage 35. Furthermore, concrete at an inner part 43 of the parting member 1 is removed, the concrete being a part of the excess concrete 33.

Description

  The present invention relates to a parting material used for dismantling surplus concrete of a field-constructed pile and a method for treating a pile head of a field-constructed pile using the parting material.

  Underground piles such as foundation piles may be constructed by site construction. An example of on-site creation of piles is shown in FIG. In this example, after excavating the ground 100 as shown in FIG. 9 (a) to form the hole 101, a reinforcing bar 102 is installed in the hole 101 as shown in FIG. 9 (b). As shown in FIG. 3, the concrete 103 is started to be placed using a tremy pipe or the like.

  As shown in FIG. 9D, the concrete placed first rises with the progress of the concrete 103 placement, and becomes piled-up concrete 103a. Pile is formed by the hardening of the concrete 103, but the surplus concrete 103a contains a slime such as earth and sand that exists at the bottom of the hole 101 and cannot be formed into a structure, so it is necessary to disassemble and remove it. In this example, after excavating the ground 100 around the pile head as shown in FIG. 9 (e), the surplus concrete 103a is dismantled and removed on the ground as shown in FIG. 9 (f).

  Various methods of dismantling the surplus concrete have been devised. For example, in Patent Document 1, concrete is placed with the inner periphery and outer periphery of the upper part of the reinforcing bar pre-covered with a cushioning material, and the concrete bar is hardened after the concrete is cured. A method is described in which the extra concrete and cushioning material on the outer side of the material are removed, and the extra concrete on the inner side is further removed.

  In Patent Document 2, concrete is placed in a state where a treatment sheet formed by foaming a biodegradable plastic is circulated around the upper end of the main bar of the reinforcing bar rod. A method is described in which concrete is hung, and further, the surplus concrete inside the treated sheet is hung.

  In this way, by attaching a dividing material such as a cushion material or a treatment sheet to the reinforcing bar in advance, the extra-concrete concrete can be divided into the inside and the outside, and the dismantling becomes easy.

JP 2003-342951 A JP 2004-308405 A

  At present, from the viewpoint of shortening the construction period and the like, there is a demand for a method of dismantling surplus concrete that is easier to work. For example, it is desirable to be able to attach the dividing material to the reinforcing bar rod without much effort.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cutting material and a pile head treatment method for a field-built pile that can easily dismantle the surplus concrete.

  1st invention for achieving the objective mentioned above is a cutting material for dividing the piled-up concrete of the pile head of a field construction pile into the inside and outside of a reinforcing rod, Comprising: The mat shape formed with the elastic material A dividing material characterized in that a plurality of cuts are provided at predetermined intervals on one surface of the main body.

It is desirable that a lower end portion of the main body is inclined in a cross section in the vertical direction of the main body.
It is also desirable that a crack inducing material projecting from the other surface of the main body is provided.
Furthermore, it is also desirable that a cutout portion is provided at the leading end portion of the cut so that the main body is cut into a cylindrical shape along the vertical direction.

  2nd invention is the pile head processing method using the parting material which provided the some notch in the one side of the mat-shaped main body formed with the elastic | stretchable raw material at predetermined intervals, Comprising: The ground was excavated. A step (a) of constructing a site-built pile by inserting a reinforcing bar with the dividing material attached in the circumferential direction while sandwiching the upper part of the main reinforcing bar into the hole, and placing concrete in the hole; Of the extra-concrete concrete at the pile head of the formed pile, the step (b) of removing the concrete outside the divided material, the step (c) of removing the divided material from the reinforcing bar, and the extra-concrete concrete, And a step (d) of removing concrete inside the parting material, and a pile head treatment method for a field-built pile.

  The dividing material of the present invention is provided with cuts at a predetermined interval on one surface of a mat-like main body, and can be easily mounted along the circumferential direction of the reinforcing bar rods with the main bars of the reinforcing bar rods sandwiched by the cuts. Moreover, since the main body is formed of a stretchable material, main bars of various shapes and diameters can be easily sandwiched, and the pitch difference of the main bars can be absorbed by expansion and contraction, so that it can be easily mounted on various reinforcing bar rods. By using the reinforcing bar with this dividing material in the circumferential direction, the extra concrete inside and outside the reinforcing bar can be divided in advance, and the demolishing work of the extra concrete can be easily performed. Moreover, it can also prevent that a main reinforcement | strength is damaged or bent at the time of dismantling of surplus concrete by using a parting material.

  Moreover, since the lower end part of the main body of a parting material inclines up and down, concrete can be started up smoothly and it can prevent that the fragile concrete mixed with slime stays under the parting material. Furthermore, by providing a crack inducing material on the other surface of the main body, the concrete outside the dividing material can be easily dismantled. In addition, by providing a cylindrical cut-out portion at the tip of the cut, the main bar is arranged inside the cut-out portion, so that the cutting material can be easily attached.

  ADVANTAGE OF THE INVENTION According to this invention, the parting material and the pile head processing method of an on-site creation pile which can dismantle the surplus concrete easily can be provided.

The figure which shows the field construction pile 29 The figure which shows the parting material 1 The figure which shows the reinforcing bar rod 35 which attached the parting material 1 The figure which shows the state which pinched the main muscle 37 in the notch | incision 7 Figure showing concrete placement The figure explaining the dismantling of surplus concrete 33 The figure explaining the dismantling of surplus concrete 33 The figure which shows the parting materials 1a and 1b Figure showing an example of on-site creation of piles

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1. Site creation pile 29)
FIG. 1 is a diagram illustrating an on-site creation pile 29 that dismantles the surplus concrete 33 using the dividing material 1 according to the embodiment of the present invention.

  The site construction pile 29 is formed by mounting the rebar 1 to the reinforcing bar 35 and then building the reinforcing bar 35 in the hole 39 formed in the ground in the same procedure as in FIG. is there.

  FIG. 1 shows the stage where the pile head is exposed to the ground by digging up the surrounding ground after the concrete is hardened, as in FIG. 9 (e). The extra-concrete concrete 33 exists in the pile head of the field construction pile 29, and the lower part of the extra-concrete concrete 33 is used as a structure.

  The reinforcing bar rod 35 is a reinforcing bar structure that is formed in a cylindrical shape by attaching vertical main bars 37 along a circumferential hoop bar (see 45 in FIG. 3) at a predetermined pitch. The diameter of the main muscle 37 is about 50 mm, for example. Further, the hoop line is omitted in the upper part of the main line 37. The dividing material 1 is mounted on the upper part of the main bar 37 of the reinforcing bar rod 35 along the circumferential direction of the reinforcing bar rod 35.

(2. Parting material 1)
FIG. 2 is a view showing the divided material 1 and shows a state before being attached to the reinforcing bar 35. 2A is a plan view of the parting material 1, FIG. 2B is an elevational view of the parting material 1, and FIG. 2C is a vertical section of the parting material 1. 2B is a view of the cut material 1 viewed from the direction of arrow A in FIG. 2A, and FIG. 2C is a cross-sectional view taken along line BB in FIG. 2B.

  The dividing material 1 is a mat-like main body 2 provided with a cut 7 and a crack inducing material 27. The main body 2 is formed of a stretchable material such as urethane.

  The thickness T of the main body 2 is about 100 mm, for example. The length H of the main body 2 in the vertical direction (corresponding to the vertical direction in FIG. 2B) is set in consideration of the height of the surplus concrete 33, and is set to a value between 800 mm and 1000 mm, for example.

  The length L of the main body 2 in the left-right direction (corresponding to the left-right direction in FIG. 2B) is determined in consideration of the circumferential length of the reinforcing bar rod 35 and the like. The parting material 1 may be manufactured in advance as a length L, or the parting material 1 manufactured in a long length in advance may be cut out with the length L at the time of product shipment or the like.

  The cut 7 is obtained by cutting the main body 2 of the dividing material 1 from the one surface 3 in the thickness direction (corresponding to the vertical direction in FIG. 2A). The notch 7 is provided in order to sandwich the main bar 37 when the parting material 1 is attached to the reinforcing bar 35. Said surface 3 is a surface which becomes an inner side when the parting material 1 is mounted on the reinforcing bar 35. The cut 7 is provided over the entire length of the surface 3 in the vertical direction. A plurality of the cuts 7 are arranged at a predetermined interval D in the left-right direction.

  The depth of the cut 7 is determined in consideration of the diameter of the main muscle 37 and the like, for example, about 70 mm. The interval D of the cuts 7 is set to be relatively narrow, for example, about 50 mm, and the number of cuts per unit length is increased. Thereby, it is applicable to various reinforcing bar rods 35 having different sizes and main bar pitches. However, the value of the interval D is not limited to the above. It is also possible to form a plurality of cuts 7 while changing the interval D.

  The crack inducing material 27 is provided so as to protrude from the other surface 5 of the main body 2 of the dividing material 1. The surface 5 is located at a position facing the one surface 3 in the thickness direction of the main body 2, and becomes an outer surface when the dividing material 1 is attached to the reinforcing bar 35. The crack inducing material 27 is provided over the entire length of the surface 5 in the vertical direction. A plurality of the crack inducing materials 27 are arranged apart from each other in the left-right direction of the main body 2.

  The crack inducing material 27 is formed, for example, by forming a thin plate of plastic or aluminum into a mountain shape. However, the material and shape of the crack inducing material 27 are not limited to this. The method of fixing the crack inducing material 27 to the main body 2 is not particularly limited, and may be fixed to the surface 5 using, for example, a tape or the like.

  As shown in FIG.2 (c), the lower end part 11 of the main body 2 of the parting material 1 inclines so that the surface 5 side may become upper in the cross section of an up-down direction. In this embodiment, as shown in FIG. 2A, the plane of the main body 2 has a substantially parallelogram shape, and both end portions 13 in the left-right direction of the main body 2 are also inclined.

(3. Pile head treatment method)
Next, the pile head processing method which disassembles the surplus concrete 33 using the parting material 1 is demonstrated.

  In this embodiment, when constructing the on-site creation pile 29, as shown in FIG. 3, the dividing material 1 is previously attached to the upper part of the main reinforcement 37 along the circumferential direction of the reinforcing bar bar 35.

  4 is an enlarged view of a range C in FIG. The dividing material 1 is covered from the outside of the reinforcing bar rod 37 so as to sandwich the main reinforcing bars 37 of the reinforcing bar rod 35 with the notches 7.

  Since the main body 2 has elasticity, the main muscle 37 and the notch 7 can be easily aligned by extending or contracting the main body 2, and the main muscle 37 can be smoothly sandwiched by the notch 7. In this embodiment, the number of the cuts 7 is larger than the number of the main muscles 37, and the main muscles 37 are sandwiched by using the cuts 7 that are close to the main muscles 37. Therefore, there is a notch 7 that is not used as shown in FIGS.

  Then, while closing both ends 13 of the main body 2 of the parting material 1 together, the main body 2 is fixed to the reinforcing bar 35 to prevent lifting during concrete placing described later. These methods are not particularly limited. For example, both end portions 13 of the main body 2 can be taped and closed, and the main bar 37 and the main body 2 can be fixed with tape.

  In addition, as a method of closing both end portions 13 of the main body 2, a hook-and-loop fastener may be attached to the inclined end surfaces of the both end portions 13, thereby connecting the both end portions 13 to each other. Moreover, as a method of fixing the main body 2 of the dividing material 1 to the reinforcing bar rod 35, a hole may be made in the main body 2, a number wire may be passed, and the main bar 37 of the reinforcing bar rod 35 may be fixed using the number wire. Alternatively, a wire or the like can be wound from the outside of the dividing material 1 and fixed to the reinforcing bar bar 35.

  As described above, the dividing material 1 is attached to the reinforcing bar 35. After the parting material 1 is mounted on the rebar bar 35, the rebar bar 35 is inserted into the hole 39 drilled in the ground as shown in FIG. Using this, concrete is placed in the hole 39.

  FIG. 5 shows the top of the hole 39. Concrete is filled from the bottom of the hole 39, and the concrete mixed with slime such as earth and sand rises to the upper part of the hole 39 as the concrete is placed.

  Since the dividing material 1 has the above-described inclination at the lower end portion 11 of the main body 2, the concrete wraps around the outside of the dividing material 1 along the inclination as indicated by an arrow D. Therefore, the concrete is smoothly launched and the concrete mixed with slime does not stay below the dividing material 1.

  After the concrete is hardened, as shown in FIG. 9E, the surrounding concrete 33 is exposed to the ground as shown in FIG.

  Next, as shown to Fig.6 (a), the concrete of the outer side part 41 of the parting material 1 among the surplus concrete 33 is demolished and removed. The extra-concrete concrete 33 is already divided into the inside and the outside by the dividing material 1 and does not adhere to the main reinforcement 37. Therefore, after cutting the lower surface with a cutter in the concrete of the outer portion 41, it is divided by striking. It can be easily dismantled by such methods. Moreover, since the main muscle 37 is protected by the parting material 1, the main muscle 37 is not damaged at the time of dismantling.

  In addition, since the crack-inducing material 27 is provided on the outer surface 5 of the main body 2 of the dividing material 1, cracks are easily generated in the concrete of the outer portion 41 by using the crack of the concrete due to the crack-inducing material 27. It is possible to easily perform operations such as allocation.

  Thereafter, as shown in FIG. 6 (b), the both ends 13 of the main body 2 of the parting material 1 are opened, and the parting material 1 is removed from the reinforcing bar rod 35 and removed while the cuts 7 are sequentially removed from the main bar 37 of the reinforcing bar bar 35. To do. The removed parting material 1 can be diverted when constructing another site-constructed pile.

  FIG. 7A shows a state where the dividing material 1 is removed. Then, the concrete of the inner part 43 of the parting material 1 among the surplus concrete 33 is dismantled and removed.

  The concrete of the inner portion 43 can be disassembled and removed by a method such as driving a wedge in the horizontal direction into the concrete and lifting it up with a crane, as in the conventional case. Since the gap is formed between the main bar 37 and the concrete of the inner portion 43 after the parting material 1 is removed, it is easy to dismantle the concrete, and the main bar 37 may be bent due to a collision with equipment during the work. Can be reduced. FIG. 7B shows a state after the concrete is removed in this way.

  As described above, the dividing member 1 according to the present embodiment is provided with the notches 7 having a predetermined interval on the one surface 3 of the mat-shaped main body 2, so that the main bars 37 of the reinforcing bar 35 are sandwiched by the notches 7. Easy to install along the circumferential direction. Further, by forming the main body 2 from a material that can be expanded and contracted, the main bars 37 of various shapes and diameters can be easily sandwiched, and the pitch difference of the main bars 37 can be absorbed by the expansion and contraction, so that it can be easily mounted on various reinforcing bar rods. is there. In the present embodiment, by using the reinforcing bar 35 with the dividing material 1 attached in the circumferential direction, the extra concrete 33 inside and outside the reinforcing bar is preliminarily divided, so that the extra concrete 33 can be easily disassembled. .

  Moreover, by using the parting material 1, it is possible to prevent the main bar 37 from being damaged or bent when the surplus concrete 33 is disassembled. The main bar 37 is used for reinforcement by being inserted into the bottom of an upper structure to be constructed later, and it is effective to prevent damage or bending as described above.

  Moreover, since the lower end part 11 of the main body 2 of the dividing material 1 is inclined up and down, the concrete is smoothly launched and mixed with slime in a portion used as a structure under the dividing material 1, that is, under the extra-concrete concrete 33. It is possible to prevent fragile concrete from staying.

  Furthermore, by providing the crack inducing material 27 on the outer surface 5 of the main body 2 of the parting material 1, the cracking of the parting material 1 is induced and the concrete of the outer portion 41 can be easily disassembled.

  However, the present invention is not limited to this. For example, in the present embodiment, one piece of the dividing material 1 is attached in the circumferential direction of the reinforcing bar 35, but a plurality of dividing materials 1 may be attached in combination. Moreover, the surface 3 side of the main body 2 may be on the contrary to the inclination of the lower end part of the dividing material 1 contrary to the above. In this case, the concrete mixed with the slime described above wraps around the dividing material 1.

  In addition, the shape of the notch is not limited to that described above. Hereinafter, an example in which the shape of the cut is different will be described as a second embodiment. Since other configurations are substantially the same as those of the first embodiment, description thereof is omitted.

[Second Embodiment]
FIG. 8A is a view showing the cut material 1a according to the second embodiment, and shows a plane in the vicinity of the cut 7 of the cut material 1a. As shown in FIG. 8A, in the present embodiment, a cutout portion 55a is formed at the tip of the cut 7 by cutting the main body 2 into a circular flat cylindrical shape along the vertical direction. The diameter of the cut-out portion 55a is determined in consideration of the diameter of the main muscle 37 and the like. For example, it is slightly larger than the diameter of the main muscle 37.

  Thus, if the cylindrical cutout part 55a is provided in the front-end | tip part of the notch 7, the main reinforcement | strength 37 of the reinforcing bar 35 can be accommodated in the cutout part 55a, and it can mount | wear with the parting material 1a easily.

  The shape of the cut-out portion is not limited to the above. For example, as shown in the parting material 1b of FIG. 8B, it is possible to provide a cylindrical hollow portion 55b having a triangular plane at the tip of the notch 7, and the same effect as described above can be obtained. The shape of the cut-out portion may be determined in consideration of workability when the cutting material is attached, ease of processing, and the like.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b ......... Parting material 2 ......... Main body 3, 5 ......... Surface 7 ......... Incision 27 ......... Crack-inducing material 29 ......... Pile on site construction 33 ......... Surfaced concrete 35 ... …… Reinforcing bar 37 ……… Main bars 55a, 55b ……… Cut out part

Claims (5)

A splitting material for splitting the surplus concrete on the pile head of the site construction pile into the inside and outside of the reinforcing bar,
A dividing material, wherein a plurality of cuts are provided at a predetermined interval on one surface of a mat-like main body formed of a stretchable material.   The dividing material according to claim 1, wherein a lower end portion of the main body is inclined in a cross section in the vertical direction of the main body.   The splitting material according to claim 1 or 2, wherein a crack inducing material protruding from the other surface of the main body is provided.   The cutting material according to any one of claims 1 to 3, wherein a cutout portion is provided at a leading end portion of the cut so as to cut out the main body in a cylindrical shape along a vertical direction. A pile head processing method using a split material provided with a plurality of cuts at a predetermined interval on one surface of a mat-like main body formed of a stretchable material,
Step (a) of constructing a site-constructed pile by inserting a reinforcing bar with the dividing material attached in the circumferential direction while sandwiching the upper part of the main reinforcement in the notch into a hole excavated in the ground, and placing concrete in the hole When,
The step (b) of removing the concrete outside the divided material from the piled-up concrete at the pile head of the site-constructed pile;
A step (c) of removing the parting material from the reinforcing bar cage;
A step (d) of removing the concrete on the inner side of the divided material of the surplus concrete;
The pile head processing method of the field construction pile characterized by comprising.

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