JP3247955B2 - Pile spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for excavating a hollow pile with auger machines or the like (usually excavation) and placing a hollow pile in a vertical pile into which concrete for consolidation has been poured. A pile spacer that is inserted and installed to remove concrete by a predetermined length from the upper end of the hollow pile after hardening concrete that rises in the laid hollow pile and fills and hardens the hollow pile. The present invention relates to a pile spacer to be used for.

[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 then a hollow pile is laid in the vertical pile and the concrete is hardened. There is a known construction method. 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.

As the pile spacer, a cylindrical spacer made of inner and outer double cardboard combined via a spacing member (Japanese Utility Model Laid-Open No. 5-27130) and a cylindrical made of synthetic resin foam. Further, a spacer in which a notch is formed in a vertical direction (Japanese Patent Laid-Open No. 4-371610) is known.
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 up and down with a traction means such as a power shovel or a crane and shaking right and left, it is integrated with the hollow pile below and can be separated from hardened concrete and removed.

[0006]

The cylindrical spacer made of cardboard is disclosed in the above publication (Japanese Utility Model Laid-Open No. 5-27130).
As noted in Japanese Patent Application Laid-Open Publication No. H10-163, there is a problem that it is difficult to insert the outer cylinder into the hollow pile exactly because it is made of hard cardboard and is cylindrical. In particular, the inner surface of the hollow pile often has irregular irregularities, and the inner diameter accuracy is not so high.In order to enable insertion regardless of the inner surface irregularities and slight differences in inner diameter, an outer cylinder is required. It is necessary to make the diameter slightly smaller, and it is unavoidable that a certain gap is formed between the outer cylinder and the inner surface of the hollow pile. 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 described in Japanese Patent Application Laid-Open No. 4-371610 and having a notch formed in a vertical direction has a certain degree of flexibility in material.
Since the diameter can be reduced by narrowing the notch, there is an advantage that the diameter can be made slightly larger, so that it can be fitted to the inner surface of the hollow pile irrespective 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. Therefore, there is a problem that flexibility in hollow piles having different diameters is lacking. In addition, since it has a notch in the vertical direction, as it is, the concrete that has risen in 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]

For this purpose, as shown in FIGS. 1 and 11, the present invention relates to a plate-shaped main body made of synthetic resin foam which can be rolled laterally and inserted into a hollow pile. On the other hand, in the longitudinal direction, a pull-out support plate that is pulled at the time of pull-out is attached, while one side of the main body is an outer surface.
Cut diagonally from side to side edge
The sides are weights cut diagonally from the inside to the side edges.
It has a joining part, and this overlapping part is when the body is rolled
A pile spacer characterized by being superimposed on the pile spacer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a pile spacer according to 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 a large number of vertical grooves 4 are formed in parallel on one side, and the main body 2 is made of synthetic resin foam. It is composed of a plate-like body.

Although the vertical groove 4 is not essential, when the main body 2 is thick or the main body 2 is a synthetic resin foam having a low expansion ratio, the main body 2 can be formed by providing the vertical groove 4. The hollow pile 1 (see FIG. 11) is preferable because it can be easily rolled into a cylindrical shape along the inner surface. Further, as is apparent from FIG. 3, the vertical groove 4 is formed on the inner surface side of the main body 2 (inside when the main body 2 is rolled).
It is provided in.

When the vertical grooves 4 are provided, as shown in FIG. 1, it is preferable to make the interval between the vertical grooves 4 wider at the center than at both sides. Specifically, the central vertical groove 4
It is preferable that the interval between them is 1.5 to 2 times the interval between the vertical grooves 4 on both sides.

In the present embodiment, the interval between the outside of two pull-out support plates 3 to be described later is narrow, and the interval between the inside of the pull-out support plate 3 is wide. The reason why the interval between the vertical grooves 4 is widened at the center of the main body 2 is that the main body 2 is temporarily fixed by being rounded by maintaining an appropriate elastic return force at the center of the main body 2. This is because when the pile spacer is stored or transported in a bale stack, it is easy to prevent the collapse.
The reason why the interval between the vertical grooves 4 is narrowed on both sides of the main body 2 is to make both sides of the main body 2 that are difficult to be curved easily curved in an arc shape.

The depth, width and interval of the vertical groove 4 may be determined according to the thickness, material, expansion ratio and the like of the main body 2. Also,
The cross-sectional shape of the vertical groove 4 may be a square or a semicircle, but is preferably an inverted triangular shape as shown in FIG.

Examples of the synthetic resin foam constituting the main body 2 include foams such as polystyrene-based synthetic resin and polyolefin-based synthetic resin. In the case of the polyolefin-based synthetic resin foam, for example, compared to polystyrene foam and the like. It is strong and flexible and excellent in elasticity and elasticity. It is easy to adhere to the inner surface of the hollow pile 1 (see FIG. 11) without cracking or chipping, hardly adheres concrete, and has good pull-out properties and pull-out properties. It is preferable because it has an advantage in terms of easy disposal. Examples of the polyolefin-based synthetic resin include polyethylene, polypropylene, and a copolymer containing 50% by weight or more of these, preferably polyethylene. When the main body 2 is made of a polyolefin-based synthetic resin foam, the expansion ratio is preferably 5 to 100 times in order to obtain necessary strength, elasticity, and the like.
More preferably, it is 20 to 90 times. The thickness of the main body 2 made of the polyolefin-based synthetic resin foam is set to 20 to 80 mm so that it can easily swing right and left by utilizing its elasticity at the time of dividing and removing hardened concrete described later.
It is preferable that

On the outer surface side of the main body 2 (outside 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 5 penetrating the main body 2. As shown in FIGS. 1 and 3, the pull-out support plate 3 is located at two locations that are substantially opposed in the radial direction when the main body 2 is rolled.

The drawing support plate 3 does not need to be provided at two positions as shown in the figure, but may be provided alone, or may be provided with three or more. In view of the ease of rounding, it is preferable to provide two at the positions shown in the figure. The attachment of the pull-out support plate 3 is preferably performed such that a shallow groove is formed in the outer surface of the main body 2 to be the mounting position, and the surface of the pull-out support plate 3 is as flat as possible with respect to the outer surface of the main body 2. . The bolt 5 is tightened by the main body 2
It is preferable that the contact plate 6 is interposed between the inner surface and the inner surface. As the backing plate 6, a low-foam plate of a polyolefin resin is preferable. In FIG. 2, 7 is a bolt 5 (FIG. 1).
And FIG. 3).

The pull-out support plate 3 is made of a strong material such as an iron plate. When the main body 2 is pulled out of the hollow pile 1 together with the concrete hardened in the rolled main body 2, a power shovel or a crane is used. And the like. Therefore, on the upper end portion of the pull-out support plate 3 (upper side when inserted into the hollow pile 1), a hooking portion 8 for hanging a wire, a hook or the like thereon to facilitate connection of a traction means such as a power shovel or a crane is provided. It is preferable to provide them. The hook 8 shown in the drawing is provided as a hole formed in the protruding portion by protruding the upper end of the pull-out support plate 3 from the upper end of the main body 2. However, since the wires and hooks can easily penetrate the main body 2, they can be provided as holes formed in a portion of the pull-out support plate 3 which is in contact with the main body 2.

The lower end of the pull-out support plate 3 (the hollow pile 1)
The lower part at the time of internal insertion) is bent toward the main body 2, and is a receiving piece 9 abutting on the lower end surface of the main body 2. The receiving piece 9 pushes up the lower end surface of the main body 2 when the pulling support plate 3 is pulled upward by connecting a pulling means such as a power shovel or a crane to the hanging portion 8, so that the main body 2 is reliably pulled out and supported. It is intended to be able to be pulled out together with the plate 3 and is preferably provided.

It is preferable that the tip of the receiving piece 9 is further raised up to the inner surface side of the main body 2 to form a rising piece 10. The rising piece 10 is for mounting an annular support 12 with a partition plate 11 as shown in FIG. 4, for example, and has a mounting hole 13 formed therefor.
Although the partition plate 11 can be provided without using the annular support member 12, when the partition plate 11 is attached using the annular support member 12,
It is easy to obtain a stable mounting state.
It is preferable to use the annular support 12 because it is also effective in preventing the rolled main body 2 from being crushed.

The annular support 12 is formed of, for example, an iron bar or the like, and has a partition plate 11 attached thereto in advance. The partition plate 11 narrows the inlet of concrete that rises from below and enters the main body 2 inserted into the hollow pile 1 (see FIG. 11), and hardens in the main body 2 and hardens in the lower part. It is intended to partition between the concrete to be separated and to easily separate the two. FIG.
The partition plate 11 shown in FIG. 1 is formed by forming a cross or radial cut 14 at the center of a disk made of a flexible material such as rubber or synthetic resin (preferably a polyolefin-based synthetic resin). A tongue piece 15 is formed, and when the tongue piece 15 is turned up, the inflow of concrete is allowed. In addition, the annular support 12 has a hooking projection 16 projecting in the inner peripheral radial direction, and the hooking projection 16 is inserted into the mounting hole 13 of the rising piece 10 as shown in FIG. It is something that can be done. Although the cross section of the hanging projection 16 and the shape of the mounting hole 13 shown in FIGS. 1, 4, and 5 are circular, they may be square or the like.
A square is preferable from the viewpoint of stability when inserted. In the partition plate 11 shown in FIG. 4, the vicinity of the hanging projection 16 of the annular support 12 is cut off.
Is inserted so that the partition plate 11 does not get in the way when it is inserted into the mounting hole 13. In addition, when using the partition plate 11 made of a synthetic resin foam, the expansion ratio can be generally 5 to 100 times, but preferably 5 to 50 times from the viewpoint of flexibility and tear strength.

Partition plate 1 to be attached to annular support 12
As shown in FIG. 6, 1 may have an extension piece 17 extending outward from the vicinity of the hooking projection of the annular support 12. This extension piece 17 is, as shown in FIG.
This covers the outer surface of the receiving piece 9, thereby preventing the concrete from sticking to the outer surface of the receiving piece 9.

Further, the annular support 12 and the partition plate 11 will be described. As shown in FIGS. 8 and 9, the annular support 12 may have a reinforcing bar 18. When the diameter of the rolled main body 2 is increased, the reinforcing bar 18 is preferably provided to reinforce the annular support 12. Further, the partition plate 11 may have a slit-shaped opening 19, as shown in FIG.

As shown in FIGS. 1 and 2, a projection 20 projects from an intermediate portion of the pull-out support plate 3. The protrusion 20 penetrates the main body 2 and protrudes toward the inner surface of the main body 2. Although the projection 20 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 20 can be provided not only at two places as shown in the figure, but also at one place or at three or more places.

A pair of overlapping portions 21a and 21b are formed on both sides of the main body 2 so as to be overlapped with the same thickness as the central portion of the main body 2 when the main body 2 is rolled in the lateral direction.
In this example, the outer surface of one side of the main body 2 is a superposed portion 21a that is cut obliquely toward the side end,
The inner surface of the other side of the main body 2 is an overlapped portion 21b that is cut obliquely toward the side end. When the main body 2 is rolled, the superposed portions 21a and 21b are superposed without generating a large step on the outer surface side as shown in FIG. 3, so that the main body 2 and the hollow pile 1 (see FIG. 11) ) Can be prevented from entering concrete. Further, since both overlapping portions 21a and 21b can have an average thickness of の of the thickness of the main body 2, it is difficult for the overlapping portions 21a and 21b to be turned up by the concrete which rises into the main body 2 from below and enters the main body 2. It can be. Reference numeral 39 denotes a stopper to which the tip of the overlapping portion 21a contacts when the main body 2 is rolled and the overlapping portions 21a and 21b are overlapped.

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

First, the main body 2 is rolled as shown in FIG. At this time, the partition plate 11 is attached to the lower opening of the rounded main body 2. The partition plate 11 may be attached to the main body 2 or the pull-out support plate 3 by using, for example, a wire or an adhesive tape. However, as described with reference to FIGS. It is preferable to use the support tool 12 because the mounting state is stabilized.

After the partition plate 11 as described above is attached and the main body 2 is rounded, it is inserted into the hollow pile 1 as shown in FIG. In addition, when the hollow pile 1 is laid in a vertical pile into which concrete for consolidation has been poured, the presser rod 22 passed through the hanging portion 8 so that the pile spacer is not lifted by the concrete rising in the hollow pile 1. It is preferable that the pile spacer is fixed to the iron frame 23 at the upper end of the hollow pile 1 by welding or the like so as to hold the pile spacer.

The pile spacer is inserted in a state where the main body 2 is simply rounded, and its diameter can be freely adjusted depending on the rounding method. It is possible to use a pile spacer for different kinds of hollow piles 1 having different diameters. Further, since the main body 2 inserted into the hollow pile 1 returns elastically and expands its diameter, it is easy to adhere to the inner surface of the hollow pile 1 regardless of the unevenness or the inner diameter of the inner surface of the hollow pile 1.
Little gap is left between the inner surface of the hollow pile 1 and the inner surface of the hollow pile 1. Therefore, in addition to the fact that concrete rising in the hollow pile 1 hardly penetrates between the inner surface of the hollow pile 1 and the main body 2, if the main body 2 is made of a polyolefin-based synthetic resin foam to which concrete does not easily adhere, after curing, The removal of the pile spacer including the main body 2 can be performed more easily.

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, or the like. 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. In some cases, 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. And the workability of insertion into the hollow pile 1 is also improved.

When the main body 2 is rolled in advance as described above, this rounding operation is efficiently performed at a factory.
The pile spacers rounded are transported and stored in bales. In particular, when the vertical grooves 4 are provided on the main body 2 to facilitate rounding, as described above, if the interval between the vertical grooves 4 at the center of the main body 2 is wider than the interval between the vertical grooves 4 on both sides,
It can be prevented from being crushed, and can be prevented from being crushed and deformed at the time of transportation / storage and becoming difficult to be inserted into the hollow pile 1. In addition, if the stopper 39 is provided, it is possible to prevent the overlapping portions 21a and 21b from sliding and the rolled main body 2 from being excessively reduced in diameter. The pile spacer can be inserted into the hollow pile 1 in advance and temporarily welded.

After the pile spacer is set in the hollow pile 1 as shown in FIG. 11, the hollow pile 1 is erected, and as shown in FIG. Sinking in 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.
In some cases, the lower end of the hollow pile 1 may be laid down while rubbing the side wall of the vertical pile, or the hollow pile may be quickly lowered. Because of this, large stones and rubble are pushed up together with the concrete rising inside the hollow pile 1,
This may fit 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. When the partition plate 11 is attached by using the annular support 12 with the reinforcing bar 18 as shown in FIGS. 8 and 9, it is easy to prevent such large stones and rubble from entering the main body 2. There is also.

After curing, as shown in FIG. 13, the hardened concrete in the main body 2 is separated from the hardened concrete thereunder, and the pile spacer is removed and removed. This separation and removal is performed by connecting the pull-out support plate 3 to a pulling means such as a power shovel or a crane by hooking a wire or a hook on the hook portion 8 and pulling the pull-out support plate 3 to the left or right if necessary. Pull-out support plate 3 on the outer surface side of main body 2
Is positioned, the upper part thereof is inclined toward the center of the hollow pile 1 so that the separation between the main body 2 and the inner surface of the hollow pile 1 can be promoted. In particular, as shown in FIG. 13, when a wire or the like is hung in an inverted Y-shape and pulled upward, as shown by an arrow, the upper portion of the pull-out support plate 3 is hollow pile 1
Since the force for tilting toward the center of the pile spacer is automatically applied, the pile spacer can be more easily pulled out.

Although the hardened concrete can be divided without providing the above-mentioned partition plate 11, as described above, if the partition plate 11 is provided, the hardened concrete in the main body 2 and the lower portion thereof can be separated. This is preferable because the hardened concrete is easily partitioned by this. The pile spacer is composed of the main body 2 and the hollow pile 1 as described above.
Since the concrete hardly penetrates into the inner surface of the main body 2 and the main body 2 is made of a material to which the concrete does not easily adhere, the main body 2 and the hollow pile 1 are hardly joined. Temporarily body 2
Even if some concrete enters between the inner surface of the hollow pile 1 and the inner surface of the hollow pile 1, the main body 2 and the inner surface of the hollow pile 1 can be separated by tilting the upper portion of the pull-out support plate 3 toward the center of the hollow pile 1 as described above. Easy to pull out because it can be promoted. Further, in order to facilitate pulling out, it is usually made of iron to which concrete is easily attached,
It is also effective to provide an adhesive tape on the surface of the pull-out support plate 3 located on the outer surface side, or to apply a release agent.

By the way, depending on the geology at the position where the hollow pile 1 is 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. When the receiving piece 9 is provided, the pulling force can be reliably applied to the main body 2 by the receiving piece 9, so that the whole can be easily pulled out together with the earth and sand even in the above-described state.

After removing the hardened concrete or earth and sand in 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.

FIG. 14 shows a second example of the present pile spacer in which a pull-out support plate 3 is attached to the inner surface of the main body 2. Further, although the pull-out support plate 3 does not have the protrusion 20, the protrusion 20 may be provided as shown by a dotted line in the drawing.

In the case of this embodiment, there is an advantage that the drawing support plate 3 which is usually made of iron to which concrete easily adheres is not exposed on the outer surface side.

FIG. 15 shows a third example of the present pile spacer, in which a main body 2 is made of two synthetic resin foam plates laminated together, and
It is sandwiched between two sheets of synthetic resin foam.

In this case, as in the second example shown in FIG. 14, there is an advantage that the drawing support plate 3, which is usually made of iron to which concrete is easily attached, is not exposed to the outside. Further, even if the overall thickness of the main body 2 is large, since the main body 2 is divided into two synthetic resin foam plates, there is an advantage that even if the number of the vertical grooves 4 is small, it is easy to round. Note that the number of plate members made of synthetic resin foam constituting the main body is not limited to two, but may be three or more.

FIG. 16 shows the partition plate 1 using the support rod 24.
1 shows a case where the support rod 24 is inserted into the mounting hole 13 of the rising piece 10.
The partition plate 11 is attached with a wire or a string. There is an advantage that the structure can be simplified as compared with the mounting structure using the annular support member 12.

The partition plate 11 shown in FIG. 16 has a tongue piece 15 formed by a cut 14 around the periphery, and the surrounding tongue piece 15 is turned up to allow the inflow of concrete. I have.

FIGS. 17 and 18 show a case in which the rising pieces are omitted. The tip of the receiving piece 9 protrudes inside the main body 2 and the two receiving pieces 9 overlap each other when the main body 2 is rolled. It has become.

With the receiving piece 9 as described above, the partition plate 11 can be easily attached to a portion protruding inside the main body 2. Further, if the tip of the receiving portion 9 is projected inside the main body 2 in this manner, the reinforcing bar 18
Similarly to (see FIGS. 8 and 9), there is an advantage that large stones and rubble can be prevented from entering the main body 2.

The partition plate 11 shown in FIG. 18 has a diameter smaller than the inner diameter of the rolled main body 2 and allows concrete to enter through a gap left between the partition plate 11 and the inner surface of the main body 2. It has become.

From the viewpoint of preventing intrusion of the large stones and debris, as shown in FIGS.
The cross bar 2 is attached to the tip of the receiving piece 9 protruding inward of the
5 is also preferable. In this way, the main body 2
The receiving piece 9 and the crossbar 2 are provided in the opening on the lower end side when the
5 is located in the cross shape, and the prevention of intrusion of the large stones and rubble described above is further ensured.

In FIGS. 19 and 20, the cross bar 25 is attached only to the receiving piece 9 on one of the pull-out support plates 3, but may be attached to the receiving pieces 9 of both the pull-out support plates 3. .

When the receiving piece 9 is provided on the pull-out support plate 3, as shown in FIG. 12, the lower end portion of the pull-out support plate 3 is bent into a substantially U-shape with the lower end surface of the main body 2 being in contact with the inner surface. The receiving piece 9 can be formed in a state where the lower end of the main body 2 is gripped in a U-shape. In this case, the same state as the case where the auxiliary piece 26 is separately joined to the receiving piece 9 so that the tip end of the receiving piece 9 protrudes toward the inner surface side of the main body 2 can be configured. Also, the auxiliary piece 26 can be raised upward to function as the above-described rising piece 10.

FIG. 22 shows another example in which the pull-out support plate 3 is attached to the main body 2. The attachment of the pull-out support plate 3 to the main body 2 with the bolts 5 is the same as that described in FIG. The projections 20 are not directly integrated with the pull-out support plate 3 by welding or the like, but are integrated with the bolts 5 when the pull-out support plate 3 is attached to the main body 2. The protruding portion 20 is formed as a plate material having an L-shaped cross section. The protruding portion 20 is also integrally fixed to the inner surface side of the main body 2 by bolts 5 with the backing plate 6 interposed between the main body 2 and the main body 2. In this way, when the pile spacer is transported in a state before assembly, the protrusions 20 are attached to the pull-out support plate 3.
Is not protruded, so that there is an advantage that the punching support plate 3 can be easily transported collectively. The backing plate 6 may be interposed between the nut and the protrusion 20 in FIG.

FIGS. 23 and 24 show a case where the intermediate ring 27 is attached.
The hook portion 28 is attached by the bolt 5 with the backing plate 6 interposed between the main body 2 and the main body 2. This hook part 28
Is for mounting through the intermediate ring 27. The intermediate ring 27 forms a split ring having a diameter substantially equal to the inner diameter of the main body 2 when rounded (usually a diameter slightly smaller than the inner diameter of the main body 2). This is for preventing collapse when storing or transporting bales. Therefore, it is preferable to provide the intermediate ring 27 for a pile spacer which is large and easily collapsed. The illustrated intermediate ring 27 is obtained by rounding a bar until both ends overlap, but may be a split ring having a gap between both ends. Since these can be elastically reduced in diameter, the diameter is set slightly larger than the inner diameter of the main body 2 when it is rolled, and it is elastically reduced when the main body 2 is rounded.
The outer surface of the main body 2 is hollow pile 1 using the elastic return force of
Can also be in close contact with the inner surface of the device. Also, intermediate ring 2
As for 7, although the above-mentioned elastic diameter reduction cannot be performed, a rod which is rounded and both ends are welded may be used.

FIGS. 25A and 25B show another example in which a hook 8 is provided at the upper end of the pull-out support plate 3. The hook portion 8 is formed as a hole provided at the upper end portion of the protruding pull-out support plate 3 so as to protrude upward, as in FIGS. 1 to 3. In the case of this example, a plate material having an L-shaped cross section is fixed to the upper end of the pull-out support plate 7,
A hanging plate 29 protruding from the outer surface side of the main body 2 is formed, and the hanging portion 8 is formed as a hole that penetrates both the L-shaped plate member and the pull-out support plate 3 that constitute the hanging plate 29. In this way, the hanging portion 8 is reinforced, and when the pile spacer is rolled and inserted into the hollow pile 1, the hanging plate 29 is hooked on the upper end surface of the hollow pile 1. By welding to the iron frame 23, the present pile spacer can be pressed into the hollow pile 1 without using the presser bar 22 (see FIG. 11).

FIG. 26 is a cross-sectional view showing a state where the present pile spacer provided with the hook portion 8 shown in FIG. 25 is pulled out from the hollow pile 1. As shown in the drawing, welding between the hook plate 29 and the rod frame 23 is performed. Will be peeled off. In order to facilitate the peeling of the weld, as shown in FIG. 25 (b), it is preferable that the welded portion 40 protrudes from the leading edge of the hanging plate 29. If the welding portion 40 is provided and welded to the iron frame 23, the welding range can be narrowed, and it is possible to prevent excessively strong welding.

By the way, as described above, the pull-out support plate 3
When the pile spacer projects into the hollow pile 1, the upper end of the pull-out support plate 3 projects upward from the upper end of the hollow pile 1 when the pile spacer is inserted into the hollow pile 1. . On the other hand, the sinking of the hollow pile 1 into the vertical pile is performed by holding the upper end of the hollow pile 1 with a chuck and building it. If it protrudes from the hollow pile 1, gripping by the chuck may be hindered. In order to prevent this, it is preferable to configure the hanging portion 8 as shown in FIGS.

The hook portion 8 shown in FIG. 27 is basically the same as the hook portion 8 described with reference to FIG. 25, except that the upper end side of the pull-out support plate 3 is laid down on the main body 2 side. I have. In particular, the one shown in FIG. 27 (a) is laid down substantially horizontally, but may be inclined as shown in FIG. 27 (b).
When the device is laid down in this manner, the gripping by the chuck is not hindered, and the pulling means can be easily connected to the hooking portion 8 by raising the upper end side of the falling down drawing support plate 3. it can.

The hanging portion 8 shown in FIG. 28 is formed by bending the upper end portion of the pull-out support plate 3 on the outer surface side of the main body 2 in an L-shape, and forming a hole provided in the lowered portion. By doing so, the upper end of the pull-out support plate 3 that has fallen down and protruded outward can also serve as the hanging plate 29 described with reference to FIG. In addition, the pulling means can be easily connected to the hook 8 by pulling the upper end of the pulled-out support plate 3 at the time of pulling, especially when gripping the upper end of the hollow pile 1 with a chuck. Since the pull-out support plate 3 does not protrude from the upper end of the hollow pile 1, gripping by the chuck is not hindered.
In FIG. 28, the pull-out support plate 3 is bent at a length halfway through the upper end surface of the hollow pile 1, but may be further extended to bend and abut on the side surface of the hollow pile 1. .

The hanging portion 8 shown in FIG. 29 is formed by bending the upper end of the pull-out support plate 3 on the inner surface side of the main body 2 in an L-shape, and as a hole provided in the lowered portion. A hanging plate 29 similar to that described with reference to FIG. By doing so, the holding bar 22 (FIG.
This pile spacer can be pressed into the hollow pile 1 without using the same. On the other hand, if the upper end of the pulled-out support plate 3 is raised in the same manner as in FIG. 27, the traction means can be easily connected to the hook portion 8 and the upper end of the hollow pile 1 is gripped by the chuck. At this time, since the pull-out support plate 3 does not protrude from the upper end of the hollow pile 1, gripping by the chuck is not hindered.

The upper end of the pull-out support plate 3 as shown in FIGS. 27 to 29 may be laid down by interposing a hinge at the upper end of the pull-out support plate 3. in this case,
The upper end of the pull-out support plate 3 may be laid down on either the outer surface side or the inner surface side of the main body 2.

FIG. 30 shows another example of the main body 2, wherein the inner edge of the lower end of the main body 2 is a tapered surface 30. 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, as shown by the arrow in FIG.
And presses the lower end of the main body 2 against the inner surface of the hollow pile 1. Therefore, the main body 2 and the hollow pile 1
Makes it difficult for concrete to penetrate between the inner surfaces.

Next, a first application example of the present invention will be described with reference to FIG.

The pile spacer shown in FIG. 31 is substantially the same as that shown in FIG. 1 except that elastic strips 31 are attached to the inner surface side of the main body 2 at two locations in the upper and lower directions. Are different. The elastic strip 31 is a strong and elastically bendable strip, such as an iron plate, to which concrete is easily attached. When the main body 2 is rolled, it is elastically rounded together, and the main body 2 spreads and attempts to return. Work to increase the ability to do 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 31 does not have to be provided in two lines as shown in FIG.
Articles or more.

Since the inner surface of the main body 2 on which the elastic strip 31 is attached is compressed when the main body 2 is rolled, the length of the elastic strip 31 is smaller than the lateral length of the main body 2. Short enough. Further, the elastic strip 31 is not fixed to the whole body 2 so as to allow compression of the inner surface side when the main body 2 is rolled, and the elastic strip 31 is Preferably, it is mounted so that it can be shifted.

The pull-out support plate 3 and the elastic strip 31 intersect separately at the front and back. At the crossing point, the main body 2, the elastic strip 31 and the pull-out support plate 3 are integrated by the bolt 5. However, since the elastic strip 31 is preferably attached in such a manner that it can be shifted laterally with respect to the main body 2 as described above, a long groove 32 is formed at a place where the bolt 5 penetrates. , This long groove 3
Through 2 the degree of freedom in the lateral direction is maintained. In FIG. 31, the left and right pull-out support plates 3 and the elastic strip 3
Although the long groove 29 is formed at each of the intersections, the long groove 32 may be formed only at the intersection of one of the left and right pull-out support plates 3 and the elastic strip 31. Further, a protrusion similar to the protrusion 20 provided on the pull-out support plate 3 can be provided on the surface of the elastic strip 31.

In the pile spacer provided with the elastic band plate 31 as described above, if the interval between the vertical grooves 4 provided in the main body 2 is made wider at the center portion than at both side portions, the roundness of the main body 2 and the ease of the main body 2 are improved. The adjustment of the elastic return force can be performed more finely.

FIG. 32 shows a second application example of the present invention, in which the elastic strip 31 described in FIG. 31 is provided on the pile spacer described in FIG. That is, FIG.
In 1, the pull-out support plate 3 is located on the outer surface side of the main body 2, but in the second applied example, the pull-out support plate 3 is located on the inner surface side of the main body 2 together with the elastic strip 31.

In the second application example, in addition to the advantage described with reference to FIG. 14, the advantage described with reference to FIG. 31 can be obtained.

FIGS. 33 and 34 show a third application example of the present invention, in which the main body 2 is wound around a support member 33 separate from the main body 2 to constitute a pile spacer.

Now, the support member 33 will be described. As shown in FIG. 34, the support member 33 is inserted into the hollow pile 1 while being included in the main body 2, and is usually made of a reinforcing material. A cage member is formed of a vertical member 34 bent at a substantially elliptical shape and welded at its ends, and an annular horizontal member 35 attached around the vertical member 34. The upper portion of the support member 33 constitutes a hook portion 8 for pulling upward with a heavy machine, and a support ring 38 attached to the end face of the hollow pile 1 is attached near this hook portion. Reference numeral 22 denotes a presser bar described with reference to FIG.

The partition plate 11 may be attached to the lower end of the support member 33 as shown by a dotted line in the figure. Alternatively, the annular support member 12 may be provided below the support member 33 and attached thereto. .

As shown in FIG. 33, the main body 2 has a vertical groove 4 on the inner surface side, and the interval between the vertical grooves 4 is wider at the center portion than at both sides as shown in FIG. This is the same as the main body 2 described above. On the inner surface of the main body 2, a vertical member holding groove 36 for accommodating and holding the vertical member 34 of the support member 33,
A horizontal member holding groove 37 that accommodates and holds the third horizontal member 35 is provided. The vertical member holding groove 36 and the horizontal member holding groove 37
The support member 33 is easily wrapped at a fixed position in the main body 2 and may be omitted.

The support member 33 separate from the main body 2 as described above
In a pile spacer formed by winding the main body 2 around the main body 2, if the interval between the vertical grooves 4 provided in the main body 2 is made wider at the center portion than at both sides, the roundness of the main body 2 and the elastic return force of the main body 2 are reduced. Adjustment can be easily performed.

[0073]

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

(1) Since the diameter of the main body 2 can be reduced and increased, it is easy to insert and adhere to the hollow pile 1 irrespective of the unevenness of the inner surface of the hollow pile 1 and the inner diameter error of the hollow pile 1.

(2) For the same reason as described above, the range in which the same pile spacer can be used for different kinds of hollow piles 1 having different diameters is expanded.

(3) Since the main body 2 elastically adheres to the inner surface of the hollow pile 1, it is difficult for concrete to enter between the main body 2 and the inner surface of the hollow pile 1, and the labor for post-processing such as hanging can be omitted. In particular, when the main body 2 is made of a polyolefin-based synthetic resin foam to which concrete does not easily adhere, it is easier to remove the pile spacer.

(4) A pair of overlapping portions 21a and 21b are provided on both sides of the main body 2, and when the main body is rolled, the both sides of the main body 2 are superposed with substantially the same thickness as the central portion of the main body 2. Therefore, the entire main body 2 can easily adhere to the hollow pile 1. At the same time, the overlapping portions 21a,
Since 21b can be made to be half the thickness of the main body 2, it can be made hard to be turned up by the rising concrete.

(5) If the main body 2 is provided with the vertical groove 4, the main body 2 can be easily rounded. In particular, if the interval between the vertical grooves 4 is increased in the central portion of the main body 2, this area is reduced. The elastic recovery force is maintained relatively large, and even if the main body 2 is rolled and temporarily fixed in advance, it is hardly deformed by being crushed during storage or transportation.

(6) If the intermediate ring 27 is attached, the collapse when the main body 2 is previously rounded and temporarily fixed can be more reliably prevented.

(7) The annular support 12 is used for mounting the partition plate 11.
The use of is easy to stabilize the mounting state of the partition plate 11, and also helps to prevent the collapse.

(8) If the pull-out support plate 3 is located on the outer surface side of the main body 2, the upper part 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. Peeling 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.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first 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 perspective view showing an annular support to which a partition plate is attached.

5 is a cross-sectional view of the vicinity of the lower end of the main body to which the annular support of FIG. 4 is attached.

FIG. 6 is a perspective view showing an annular support to which another partition plate is attached.

7 is a sectional view of the vicinity of the lower end of the main body to which the annular support of FIG. 6 is attached.

FIG. 8 is a perspective view showing an example of an annular support with a reinforcing bar.

FIG. 9 is a perspective view showing another example of an annular support with a reinforcing bar.

FIG. 10 is a perspective view showing another example of the partition plate.

FIG. 11 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. 12 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. 13 is a cross-sectional view showing a state in which the hardened concrete in the pile spacer is cut out from the hardened concrete thereunder and is being extracted.

FIG. 14 is an exploded perspective view showing a second example of the pile spacer according to the present invention.

FIG. 15 is an exploded perspective view showing a third example of the pile spacer according to the present invention.

FIG. 16 is a cross-sectional perspective view of the vicinity of the lower end of the main body, showing another example when a partition plate is attached.

FIG. 17 is a perspective view showing another example of the pull-out support plate.

FIG. 18 is a perspective view of the pile spacer having the pull-out support plate of FIG. 17 near the lower end in a rolled state.

FIG. 19 is a perspective view showing still another example of the pull-out support plate.

20 is a perspective view of the pile spacer provided with the pull-out support plate of FIG. 19 near a lower end in a rolled state.

FIG. 21 is a cross-sectional view showing another example in which a receiving piece is provided.

FIG. 22 is a cross-sectional view showing an example in which a pull-out support plate separate from a protrusion is attached to the main body.

FIG. 23 is a cross-sectional view showing a case where a hook portion is provided at a longitudinally intermediate portion of the main body.

24 is a cross-sectional perspective view of the middle part of the main body, showing a state where an intermediate ring is attached to the hook part of FIG. 23.

FIG. 25 is a view showing another example in which a hook is formed at the upper end of the pull-out support plate.

FIG. 26 is a cross-sectional view showing a state where the pile spacer having the hanging portion of FIG. 25 is pulled out from the hollow pile.

FIG. 27 is a cross-sectional view showing a case where the upper end portion of the pull-out support plate is laid down to form a hook portion.

FIG. 28 is a cross-sectional view showing another example in which the upper end of the pull-out support plate is folded down to form a hook.

FIG. 29 is a cross-sectional view showing still another example in the case where the upper end of the pull-out support plate is laid down to form a hook.

FIG. 30 is a sectional view showing another example of the main body.

FIG. 31 is a perspective view showing a first application example of the present invention.

FIG. 32 is a perspective view showing a second application example of the present invention.

FIG. 33 is a perspective view of a main body according to a third application example of the present invention.

FIG. 34 is a cross-sectional view showing a state where the main body of FIG. 33 is wound around a support member and inserted into a hollow pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow pile 2 Main body 3 Pull-out support plate 4 Vertical groove 5 Bolt 6 Backing plate 7 Bolt hole 8 Hanging part 9 Receiving piece 10 Standing piece 11 Partition plate 12 Annular support 13 Mounting hole 14 Cut 15 Tongue piece 16 Hanging projection 17 Projection piece 18 Reinforcement bar 19 Slit-like opening 20 Projection part 21a Overlapping part 21b Overlapping part 22 Holding rod 23 Iron frame 24 Support rod 25 Cross bar 26 Auxiliary piece 27 Intermediate ring 28 Hook part 29 Hanging plate 30 Tapered surface 31 Elastic band Plate 32 Slotted hole 33 Supporting material 34 Vertical material 35 Horizontal material 36 Vertical material holding groove 37 Horizontal material holding groove 38 Support ring 39 Stopper 40 Welded part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 5/34

Claims (7)

(57) [Claims] 1. A pull-out support plate, which is pulled at the time of pull-out, is attached to a longitudinal direction of a plate-shaped main body made of a synthetic resin foam which can be rolled in a horizontal direction and inserted into a hollow pile. , One side of the body is cut diagonally from the outer surface
And the other side is inclined from the inner surface to the side edge.
This has an overlapping part cut out
The pile spacers are overlapped when the body is rolled . 2. The pile spacer according to claim 1, wherein a number of vertical grooves are formed in parallel on an inner surface side of the main body. 3. The pile spacer according to claim 2, wherein the interval between the vertical grooves is wider at the center portion than at both side portions. 4. The pile spacer according to claim 1, wherein the synthetic resin is a polyolefin-based synthetic resin. 5. The body according to claim 1, wherein the two pull-out support plates are attached to the outer surface side of the main body at positions substantially facing each other in a radial direction when the main body is rolled. Pile spacer. 6. A lower end portion of each pull-out support plate is bent toward the main body to form a receiving piece abutting on a lower end surface of the main body, and a tip end of the receiving piece of each pull-out support plate is formed on an inner surface of the main body. 6. The pile spacer according to claim 5, wherein the partition plate is attached to an annular support held between the rising pieces. 7. A hook portion for mounting an intermediate ring having a diameter substantially equal to an inner diameter when the main body is rounded, is provided at a vertical intermediate portion on the inner surface side of the main body. ~ Any of 6 pile spacers.