JPH108461A - Pile spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit a main body in the inside of a hollow pile regardless of the irregularity of the inside of a hollow pile and the size of its bore by composing a main body which is rolled up and inserted inside the hollow pile of plural sheets of piled up polyolefin system synthetic resin foamplates having specified thickness, and attaching a drawn supporting plate in a longitudinal direction on the outside of the main body. SOLUTION: A plate-shaped main body 2 which can be inserted in a hollow pile by laterally rolling up it is composed by piling up plural sheets of polyolefin system synthetic resin foamplates, and the main body is easy to roll up into cylindrical shape along the inside of the hollow pile 1. The thickness of the synthetic resin foamplate is set up 5-30mm to restrain elastic repulsive force in the case of rolling up. After a partition plate 14 to narrow an opening on the side of the rising piece 4 of the rolled main body 2 is attached to a support bar 5, it is insertedly provided in the hollow pile 1. In this case, a hanging plate 10 is weldely fastened to an iron frame 15 on the upper end of the hollow pile 1 that concrete rising in the hollow pile 1 may not float up a main pile spacer to press down the main pile spacer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile spacer which is pre-inserted above a hollow pile which is excavated by an auger machine or the like and which is submerged in a vertical pile into which concrete for consolidation is poured. Further, the present invention relates to a pile spacer used for removing concrete which rises in a submerged hollow pile to fill the hollow pile and hardens, and after hardening, removes a predetermined length from the upper end of the hollow pile.

[0002]

2. Description of the Related Art As a construction method of foundation work of a building or the like, concrete for consolidation is poured into a vertical pile excavated by an auger machine or the like, and a hollow pile is laid in the vertical pile.
A method of hardening the concrete is known. When the hollow pile is laid down in this method, the concrete poured into the vertical pile rises and fills the hollow pile, and excess concrete overflows from the hollow pile.

[0003] By the way, in order to form the hollow pile and the underground beam integrally connected to each other, a cage-shaped rebar is inserted above the hollow pile laid in the vertical pile. It is necessary to remove the hardened concrete that fills the upper part and to re-create the space for the cage-shaped reinforcing bar at the upper part of the hollow pile.

[0004] A pile spacer is used to fill the upper portion of the hollow pile and facilitate the removal of hardened concrete.

[0005] The pile spacer is formed of an inner and outer double cardboard cylindrical spacer combined via a spacing member, and a synthetic resin foam cylindrical member having a cutout formed in a vertical direction. Is known (Japanese Unexamined Patent Publication No. 4-3).
No. 71610). In each case, the cage-shaped support material is inserted into the upper part of the hollow pile with the upper part exposed and included, and the concrete hardened in the spacer is passed through the upper part of the exposed support material. By pulling upward with a heavy machine such as a backhoe and shaking it left and right, it is integrated with the hollow pile below it so that it can be separated from hardened concrete and removed.

[0006]

However, as pointed out in the above-mentioned publication, the cylindrical spacer made of cardboard is made of hard cardboard and is cylindrical, so that the outer cylinder is placed inside the hollow pile. There is a problem that it is difficult to insert exactly. In particular, the inner surface of the hollow pile often has irregular irregularities,
The inner diameter accuracy is not so high, so to enable insertion regardless of the inner surface irregularities and slight differences in inner diameter, the outer cylinder diameter needs to be slightly smaller. It is inevitable that there will be some gap between them. For this reason, concrete penetrates between the outer cylinder and the inner surface of the hollow pile, and the outer cylinder is strongly attached to the inner surface of the hollow pile, and the outer cylinder tends to remain in the hollow pile. Also,
Even if the outer cylinder can be removed, the concrete that has entered between the outer cylinder and the inner surface of the hollow pile remains. Strict construction requires its removal, and there is a problem that the removal work requires a lot of trouble.

On the other hand, a spacer made of a synthetic resin foam and having a notch formed in a vertical direction has a certain degree of flexibility in terms of material and can be reduced in diameter by narrowing the notch. By setting the diameter slightly larger, there is an advantage that the inner surface of the hollow pile can be fitted regardless of the unevenness of the inner surface and a slight difference in the inner diameter.

However, although having the above advantages,
Since the diameter can be reduced but not expanded, if the inner diameter of the hollow pile is larger than expected, it is not possible to cope with it.In addition, a spacer with a diameter corresponding to each hollow pile with a different diameter must be prepared. However, there is a problem that the flexibility of hollow piles having different diameters is lacking. In addition, since it has a notch in the longitudinal direction, as it is, the concrete that has risen into the spacer is integrated with the inner surface of the hollow pile through this notch, and the hardened concrete in the spacer is cut off and removed. It hinders. Therefore, it is necessary to wrap and insert a synthetic resin film or the like around the outer periphery or inner periphery, or to insert and combine the inside and outside double by shifting the position of the notch, and there is also a problem that the work on site is troublesome.

The present invention has been made in view of the above-mentioned conventional problems, and can be fitted to the inner surface of the hollow pile irrespective of the unevenness and the diameter of the inner surface of the hollow pile. It is an object of the present invention to provide a pile spacer that can easily and reliably be removed after hardening concrete.

[0010]

According to the present invention, there is provided:
As shown in FIGS. 1 and 6, a plate-shaped main body 2 that can be inserted into a hollow pile 1 by being rolled in a lateral direction, and a pull-out support plate attached in a vertical direction on an outer surface side when the main body 2 is rolled. And the main body 2 is a pile spacer in which a plurality of polyolefin-based synthetic resin foam plates having a thickness of 5 to 30 mm are stacked.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the pile spacer of this embodiment has a main body 2 in which two polyolefin-based synthetic resin foam plates having a thickness of 2 to 30 mm are stacked.

Although the main body shown in FIG. 1 is formed by stacking two polyolefin-based synthetic resin foam plates, the number may be three or more. In the present invention, especially the main body 2
Is formed by stacking a plurality of polyolefin-based synthetic resin foam plates so that the main body 2 can be easily rolled into a cylindrical shape along the inner surface of the hollow pile 1 (see FIG. 6). That is, when the main body 2 is formed of one thick polyolefin-based synthetic resin foam plate, the elastic repulsion force when the main body 2 is rolled into a cylindrical shape becomes large, and this operation is difficult to perform. On the other hand, when a plurality of thin polyolefin-based synthetic resin foam plates are stacked as in the present invention, each polyolefin-based synthetic resin foam plate is easily bent and deformed individually. The repulsive force is suppressed, and work becomes easier. In the present invention, the thickness of each polyolefin-based synthetic resin foam plate constituting the main body is set to 5 to 30 mm. If the thickness is too large, the elastic repulsion force at the time of rounding cannot be sufficiently suppressed. The thickness of the polyolefin-based synthetic resin foam plates to be stacked may be the same or different as long as the thickness is within the above range.

The polyolefin-based synthetic resin foam plate constituting the main body 2 is stiffer and more excellent in flexibility and elasticity than, for example, a polystyrene foam or the like, and is provided on the inner surface of the hollow pile 1 without cracking or chipping. It has the advantage that it is easy to adhere and the concrete is hard to adhere. Examples of the polyolefin-based synthetic resin include polyethylene, polypropylene, and a copolymer containing 50% by weight or more of these, preferably polyethylene. The expansion ratio of the polyolefin-based synthetic resin foam plate is preferably 5 to 100 times, more preferably 20 to 50 times, in order to obtain necessary strength, elasticity, and the like. Further, the thickness of the entire main body 2 formed by stacking the polyolefin-based synthetic resin foam plates is preferably 20 to 50 mm so as to be easily swung right and left at the time of dividing and removing hardened concrete described later.

On the outer surface side of the main body 2 (the outer surface side when the main body 2 is rolled), a pull-out support plate 3 as shown in FIG.
It is attached in the vertical direction by bolts 6 penetrating the main body 2. When attaching the pull-out support plate 3, a shallow groove is formed on the outer surface of the main body 2 to be an attachment position,
It is preferable that the surface of the pull-out support plate 3 is set as flat as possible with respect to the outer surface of the main body 2. Also,
The pull-out support plate 3 is, as shown in FIGS.
When the main body 2 is rolled, it is located at almost two opposing positions. The drawing support plate 3 does not have to be provided two as shown in the figure, but may be three or more provided that it is provided at a position substantially facing when the main body 2 is rolled. Is sufficient. In FIG. 2, reference numeral 8 denotes a bolt hole for passing the bolt 6 (see FIGS. 1 and 3).

The draw-out support plate 3 is made of a strong material such as a steel plate, for example, and is formed by rolling concrete hardened in the main body 2 inserted into the hollow pile 1 (see FIG. 6) together with the main body 2. It is a member that applies an external force with heavy equipment such as a bulldozer or crane when it is pulled out. Therefore, at one end of the pull-out support plate 3 (the upper end side when inserted into the hollow pile 1), there is provided a hook hole 9 for connecting a heavy machine such as a bulltozer or a crane by hanging a wire, a hook or the like. . The illustrated hook hole 9 is provided at the protruding portion with one end of the pull-out support plate 3 protruding from the main body 2, but the wires and hooks can easily penetrate the main body 2. It can also be provided on the portion of the pull-out support plate 3 that is in contact with 2.

An L-shaped hooking plate 10 whose one end protrudes outward is integrally attached to the formation portion of the hooking hole 9 so as to overlap the pull-out support plate 3. The first role of the hanging plate 10 is to reinforce the hanging hole 9 portion. Hanging plate 10
As shown in FIG. 6, when the present pile spacer is inserted into the hollow pile 1, as shown in FIG. 6, the pile spacer comes into contact with the edge of the hollow pile 1 to prevent the pile spacer from dropping. is there. The third role of the hanging plate 10 is to weld the steel pile 16 at the end of the hollow pile 1 to submerge the hollow pile 1 in which the pile spacer is set in a vertical pile into which concrete for consolidation is poured. In this case, the pile spacer is prevented from floating by the concrete rising in the hollow pile 1.

The other end of the pull-out support plate 3 (the lower end when inserted into the hollow pile 1) is bent toward the main body 2 near the end face of the main body 2, and further rises toward the inner surface of the main body 2, and rises. It is piece 4. As shown in FIG. 4, when the main body 2 is rolled, a support bar 5 is attached to the rising piece 4 so as to be hung. This support rod 5 is L
One of the rising pieces 4 facing one end bent in the shape of a letter
The other end is inserted into the mounting hole 11 provided in the other rising piece 4 and the nut 12 is screwed into the mounting hole 11. The support rods 5 are used to prevent the pile spacers that have been rolled and temporarily fastened from being temporarily crushed when they are piled up in a bales, and are used as attachment members for a partition plate 14 described in detail later. . Also, the drawing support plate 3
Is bent from the outer surface side to the inner surface side near the end face of the main body 2 in order to form the rising piece 4. When the plate 3 is pulled upward, the main body 2
Of the main body 2 can be reliably pulled out together with the support plate 3.

As shown in FIGS. 1 and 2, a protrusion 7 projects from an intermediate portion of the pull-out support plate 3. The protrusion 7 penetrates the main body 2 and protrudes to the inner surface side of the main body 2. Although the projection 7 is not essential, it can enhance the integration between the drawing support plate 3 and the main body 2 and the integration between the drawing support plate 3 and the concrete hardened in the rolled main body 2. Preferably, it is provided. Further, the protrusions 7 can be provided not only at two places as shown, but also at one place or at three or more places.

By the way, as described above, the pull-out support plate 3 is attached with the bolts 6 penetrating the main body 2, and the pull-out support plate 3 is provided with the protruding portion 7 that penetrates the main body 2 and protrudes toward the inner surface side of the main body 2. In this case, in the region of the main body 2 sandwiched between the two pull-out support plates 3, the displacement between the polyolefin-based synthetic resin foam plates constituting the main body 2 by being overlapped is suppressed to some extent. For this reason, in the said area | region, the roundness by which the main body 2 is comprised by stacking several polyolefin-type synthetic resin foam boards is reduced somewhat. However, when the main body 2 is rolled, it is most difficult to round it at both end portions of the main body 2 outside the pull-out support plate 3, and both side ends of the main body 2 are free ends, so that the main body 2 is overlaid. Free displacement between the polyolefin-based synthetic resin foam plates is allowed, and the above-described roundness is easily exhibited. In addition, the penetrating portion of the bolt 6 and the penetrating portion of the protrusion 7 are formed as long holes or slits, and by allowing these penetrating portions to have play, the displacement of each polyolefin-based synthetic resin foam plate is allowed, and the entire body is allowed to move. It can be easily rolled and maintained.

On one side edge of the main body 2 in the lateral direction, there is provided a thin overlapping piece 13 which is superimposed on the other side edge when the main body 2 is rolled. The overlapping piece 13 is formed integrally with the main body 2 or provided on the main body 2 by welding or bonding. Although the overlapping piece 13 is not indispensable, if the overlapping piece 13 is provided, both side edges when the main body 2 is rolled can be overlapped without generating a large step on the outer surface side. , The entire circumference of the main body 2 is a hollow pile 1
(See FIG. 3), which makes it easier to adhere to the inner surface of the main body 2 and the inner surface of the hollow pile 1.

The overlapping piece 13 is preferably made of a polyolefin-based synthetic resin similarly to the main body 2. Further, although the overlapping piece 13 is formed to be thin but has a strong stiffness, it is easy to perform the overlapping operation when the main body 2 is rolled. The polyolefin-based synthetic resin foam having a magnification of 50 times or less is preferable. When a polyolefin-based synthetic resin foam is used, the expansion ratio is preferably 5 to 50 times.

Next, a method of using the above-mentioned pile spacer will be described with reference to FIGS.

First, the main body 2 is rolled as shown in FIG. At this time, as shown in FIG. 4, the partition plate 14 for narrowing the opening on the rising piece 4 side of the rounded main body 2 is, for example, a string,
The support bar 5 is attached to the support bar 5 by means of an adhesive tape, wire, or the like. The partition plate 14 narrows the inflow port of concrete that rises from below and enters the main body 2 inserted into the hollow pile 1 (see FIG. 6), and after the concrete in the hollow pile 1 hardens, 2 with hardened concrete
The connecting point between the lower hardened concrete and the hardened concrete is partitioned only into the inflow port so that the two can be easily separated.

The partition plate 14 shown in FIG. 4 is a disk made of a flexible material such as rubber or synthetic resin, for example, and its periphery is divided into a plurality of tongues by cuts 16. When the tongue turns up, concrete flows in. The partition plate 14 has a disk shape slightly smaller than the inner diameter of the rolled main body 2,
The concrete may be caused to flow through a gap left around the periphery of the concrete 4. As a specific example of another partition plate 14, as shown in FIG. 5A, for example, a circular or radial cut is formed at the center of a disk made of a flexible material such as rubber or synthetic resin. 16 are formed to form a plurality of tongue pieces, and the tongue pieces are turned up to allow the inflow of concrete. As shown in FIG. And the like. In any case, the partition plate 14
As a material of the resin, a polyolefin-based synthetic resin to which concrete does not easily adhere is preferable.

After the main body 2 is rounded as described above and the support bar 5 and the partition plate 14 are attached, they are inserted into the hollow pile 1 as shown in FIG. Further, when the hollow pile 1 is laid in a vertical pile into which concrete for consolidation has been poured, the hanging plate 10 is placed at the upper end of the hollow pile 1 so that the pile spacer is not raised by the concrete rising in the hollow pile 1. The pile spacer is fixed to the iron frame 15 by welding or the like, and the pile spacer is held.

The pile spacer is simply inserted in a rounded state, and its diameter can be freely adjusted by the rounding method. Therefore, the same spacer can be used in addition to the unevenness and the inner diameter of the inner surface of the hollow pile 1. It is possible to use different kinds of hollow piles 1 having different diameters. In addition, hollow pile 1
Since the main body 2 inserted into the inside of the hollow pile 1 returns elastically and expands its diameter, it easily adheres to the inner surface of the hollow pile 1 irrespective of the unevenness and the inner diameter of the inner surface of the hollow pile 1. Leaves little gap between them. Therefore, concrete that rises in the hollow pile 1 hardly penetrates between the inner surface of the hollow pile 1 and the main body 2, and the main body 2 is formed by stacking a polyolefin-based synthetic resin foam plate to which the concrete does not easily adhere. Therefore, the pile spacer including the main body 2 can be easily removed after curing.

When the main body 2 is rolled and inserted into the hollow pile 1, the rolled main body 2 is temporarily fixed with, for example, a string, a tape, a tape with a tape fastener, etc. Then, the insertion work becomes easy. Also, even if a string or tape (for example, a polypropylene tape) or the like is wrapped and fixed, and inserted into the hollow pile 1 as it is, the rolled main body 2 is partially wound with the string or tape due to the concrete flowing into the inside. The diameter is enlarged so that it is narrowed. Therefore, if the outer diameter of the main body 2 which is rounded is not extremely small as compared with the inner diameter of the hollow pile 1, the main body 2 can be sufficiently brought into close contact with the inner surface of the hollow pile 1 even with the present pile spacer having such a stopping method. It is also possible to improve the workability of insertion into the hollow pile 1. However, when the main body 2 has the overlapping pieces 13 as shown in FIGS. 1 and 3, if the inner diameter of the hollow pile 1 is small, In some cases, the edge portion of the rounded main body 2 is overlapped over the overlapping piece 13. In such a case, the length may be adjusted by appropriately cutting the main body 2 with a cutter or the like.

After the pile spacer is set in the hollow pile 1 as shown in FIG. 6, the hollow pile 1 is erected, and as shown in FIG. Sink. The sinking is performed by hanging down the hollow pile 1 with a crane or the like, but it is not always easy to lower the hollow pile 1 vertically at an appropriate speed, and the lower end of the hollow pile 1 is set down while rubbing the side wall of the vertical pile. Alternatively, the hollow pile may be lowered rapidly.
For this reason, large stones and rubble are pushed up together with the concrete rising in the hollow pile 1 and may be fitted into the rolled and inserted main body 2. If a large stone or rubble is firmly fitted into the main body 2, it becomes difficult to pull out the pile spacer after curing. The support bar 5 is also for preventing such a large stone or rubble from entering the main body 2.

After curing, as shown in FIG.
The hardened concrete inside is separated from the hardened concrete below, and the whole pile spacer is extracted and removed.
This separation and removal is carried out by connecting the pull-out support plate 3 to a heavy machine such as a bulldozer or a crane by hooking a wire or a hook on the hook hole 9 and pulling it up, and further swinging it left and right if necessary. In this pile spacer, since the pull-out support plate 3 is located on the outer surface side of the main body 2, the upper part thereof is inclined toward the center of the hollow pile 1 so that the main body 2 and the hollow pile 1 are inclined.
Separation from the inner surface can be promoted. In particular, as shown in FIG. 8, when a wire or the like is hooked in an inverted Y-shape and pulled upward, a force for automatically tilting the upper portion of the pull-out support plate 3 toward the center of the hollow pile 1 is automatically applied as shown by an arrow. So
Pulling out the pile spacer becomes easier.

The above-mentioned division can be performed without providing the partition plate 14, but as described above, if the partition plate 14 is provided, the hardened concrete in the main body 2 and the hardened concrete below the main body 2 can be separated. This is preferable because it is separated by this and is easily divided. Further, as described above, the present pile spacer has a structure in which concrete hardly penetrates between the main body 2 and the inner surface of the hollow pile 1 and the main body 2 is made of a material to which concrete does not easily adhere. Are not strongly bonded. Suppose body 2 and hollow pile 1
Even if some concrete enters between the inner surface and the inner surface, the upper portion of the drawing support plate 3 is inclined toward the center of the hollow pile 1 as described above, so that the separation between the main body 2 and the inner surface of the hollow pile 1 can be promoted. Easy to pull out.

Incidentally, depending on the geology at the position where the hollow pile 1 is to be embedded and the construction state, the concrete does not rise to the upper part of the hollow pile 1 and the earth and sand may be pushed up instead. In this case, the inside of the main body 2 is filled with earth and sand, but since the earth and sand do not harden like concrete, the pulling force applied to the pulling support plate 3 is not dispersed, and the main body 2 is concentrated on the pulling support plate 3 portion. It is easy to join. In such a state, only the pull-out support plate 3 comes off the main body 2 and is pulled out.
The earth and sand and the main body 2 tend to remain. The pull-out support plate 3 of the pile spacer assumes such a state. The pull-out support plate 3 holds the main body 2 from the outside, and its lower end is bent inward of the main body 2 near the end face of the main body 2. And ensure that the pull-out force is
Therefore, even in the above-mentioned state, the whole can be easily pulled out together with the earth and sand.

After removing the hardened concrete or earth and sand from the pile spacer and the main body 2 in this manner, a cage-shaped reinforcing bar is inserted into the space above the hollow pile 1 opened by this, and the underground is inserted. Construction of beams will be advanced.

Next, another example of the embodiment of the present invention will be described with reference to FIG. In FIG. 9, the same reference numerals as those in FIG. 1 indicate the same members.

The pile spacer shown in FIG. 9 is substantially the same as that shown in FIG. 1, but elastic strips 18 are attached to the inner surface side when the main body 2 is rolled up and down at two places and laterally. Are different. This elastic strip 18 is
For example, a steel plate or the like is a band plate to which concrete is easily adhered, and which is strong and elastically bendable. When the main body 2 is rolled, it is elastically rounded together, and serves to increase the force of the main body 2 spreading and returning. . In addition, the joint between the pull-out support plate 3 and the main body 2 is reinforced, and the concrete is integrated with the hardened concrete in the rolled main body 2 so that the concrete can be easily pulled out together with the pull-out support plate 3 and the main body 2. The elastic strip 18 does not have to be provided in two lines as shown in FIG.
It can be three or more.

Since the inner surface of the main body 2 on which the elastic strip 18 is attached is compressed when the main body 2 is rolled, the length of the elastic strip 18 is smaller than the lateral length of the main body 2. Short enough. Further, the elastic band plate 18 is not fixed to the whole body 2 so as to allow the compression of the inner surface side when the main body 2 is rolled. Preferably, it is mounted so that it can be shifted.

The pull-out support plate 3 and the elastic strip 18 intersect separately at the front and back. At the crossing point, the main body 2, the elastic strip 18 and the pull-out support plate 3 are integrated by the bolt 6. However, since the elastic strip 18 is preferably mounted so as to be displaceable in the lateral direction with respect to the main body 2 as described above, a slot 19 is formed at a place where the bolt 6 penetrates. And this slot 1
Through 9 the degree of freedom in the lateral direction is maintained. In FIG. 9, the left and right pull-out support plates 3 and the elastic strips 18 are shown.
A slot 19 is formed at each of the intersections of the elastic strip 1 and the left or right pull-out support plate 3 (generally, the pull-out support plate 3 on the opposite side to the overlapping piece 13).
The slot 19 may be formed only at the intersection of the eight. Further, a protrusion similar to the protrusion 7 provided on the pull-out support plate 3 can be provided on the surface of the elastic strip 18.

FIG. 10 shows another example of the main body 2.
The inner edge of the lower end of the main body 2 is a tapered surface 20. In this way, the concrete that rises when the hollow pile 1 is laid in the vertical pile into which the concrete for consolidation has been poured flows along the tapered surface 20 as shown by the arrow in FIG. The lower end of the main body 2 is pressed against the inner surface of the hollow pile 1. Therefore, it is difficult for concrete to enter between the main body 2 and the inner surface of the hollow pile 1.

[0039]

The present invention is as described above, and has the following effects.

(1) Since the main body 2 is formed by stacking a plurality of polyolefin-based synthetic resin foam plates and is easily rolled, it is easy to perform the work of rolling and inserting into the hollow pile 1 on site.

(2) The main body 2 inserted into the hollow pile 1 is elastically expanded in diameter and closely adheres to the inner surface of the hollow pile 1.
Irrespective of the unevenness of the inner surface of the hollow pile 1 and the error of the inner diameter of the hollow pile 1, the insertion and close contact with the hollow pile 1 are easy.

(3) For the same reason as described above, the same pile spacer can be used for different kinds of hollow piles 1 having different diameters, and the versatility is high.

(4) Since the main body 2 is in close contact with the inner surface of the hollow pile 1, it is difficult for concrete to penetrate between the main body 2 and the inner surface of the hollow pile 1, and the polyolefin-based synthetic resin foam plate is hard for the main body 2 to adhere to concrete. Since it is manufactured, it is easy to remove, and labor for post-processing such as dropping can be omitted.

(5) The pull-out support plate 3 is located on the outer surface side of the rounded main body 2, and the upper portion of the pull-out support plate 3 is inclined toward the center of the hollow pile 1 so that the main body 2 and the inner surface of the hollow pile 1 are separated. Can be promoted. Therefore, it is easy to pull out even if some concrete enters between the main body 2 and the inner surface of the hollow pile 1.

(6) The lower end of the pull-out support plate 3 is
Is bent toward the inner surface of the main body 2 in the vicinity of the end surface of the main body 2, the pull-out force applied to the pull-out support plate 3 is reliably transmitted to the main body 2, and the pull-out support plate 3 is pressed to embrace the main body from the outside. Therefore, the entire pull-out support plate 3 can be reliably pulled out without being separated from the main body at the time of pull-out.

(7) When the support rods 5 are attached to the rising pieces 4 so as to be hung, the main body 2 is hardly crushed when the main body 2 is rolled up and temporarily piled up. Can be used for mounting the partition plate 14, so that the partition plate 14 can be easily mounted.

(8) Since it is not necessary to combine and use a plurality of different parts on site, workability on site is good.

(9) If the unfolded state is not rounded during transportation and storage, transportation and storage can be performed in a flat plate shape, and no space is required for transportation and storage, and costs required for these can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a pile spacer according to the present invention.

FIG. 2 is a perspective view of a pull-out support plate.

FIG. 3 is a perspective view showing a state where the pile spacer of FIG. 1 is rolled.

FIG. 4 is a cross-sectional perspective view of one rising side of the pile spacer in FIG. 1 in a rolled state.

FIG. 5 is a diagram showing an example of a partition plate.

FIG. 6 is a cross-sectional view showing a state where the pile spacer of FIG. 1 is set on an upper portion of a hollow pile.

FIG. 7 is a cross-sectional view showing a state in which the hollow pile in which the pile spacer of FIG. 1 is set is laid down on a vertical pile into which consolidation concrete has been poured.

FIG. 8 is a sectional view showing a state in which the hardened concrete in the pile spacer is cut out from the hardened concrete below the pile spacer and is being extracted.

FIG. 9 is an exploded perspective view showing another example of the pile spacer according to the present invention.

FIG. 10 is a sectional view showing another example of the main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow pile 2 Main body 3 Pull-out support plate 4 Stand-up piece 5 Support rod 6 Bolt 7 Projection 8 Bolt hole 9 Hanging hole 10 Hanging plate 11 Mounting hole 12 Nut 13 Laminated piece 14 Partition plate 15 Iron frame 16 Cut 17 Cut-out part 18 Elastic strip 19 Slot 20 Tapered surface

Claims (5)

[Claims] 1. A body having a plate-like shape which can be inserted into a hollow pile by being rolled in a lateral direction, and a pull-out support plate which is attached in a vertical direction on an outer surface side when the body is rolled. A pile spacer, wherein a plurality of polyolefin-based synthetic resin foam plates having a thickness of 5 to 30 mm are stacked. 2. A pull-out support plate is provided at a position facing the main body when the main body is rolled, and one end of the pull-out support plate is bent toward the main body near an end face of the main body, and further stands on the inner surface side of the main body. 2. The pile spacer according to claim 1, wherein the pile spacer is raised to form a rising piece to which the support rod is hung and attached. 3. The pile spacer according to claim 1, wherein an elastic strip is attached to an inner side of the main body in a lateral direction. 4. A pile spacer according to claim 1, wherein a thin overlapping piece is provided at one lateral edge of the main body so as to be overlapped with the other end of the main body when rolled. . 5. The pile spacer according to claim 1, further comprising a hanging plate protruding outwardly at the other end of the pull-out support plate.