JP2007039892A - Pile spacer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance handling performance, safety and productivity of a pile spacer by restraining generation of clearance between a hollow pile inner surface and the pile spacer without impairing extraction performance of the pile spacer. <P>SOLUTION: A towing belt 5 installed by being inserted all the way into the lower side of a body 2, is used as a member connected with a towing means in extraction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, when a hollow pile is buried in an excavation hole that has been excavated by an auger machine or the like (usually, bottom-expanding excavation) and injected with concrete for consolidation, the inside of the hollow pile built in the drill hole is raised. The present invention relates to a pile spacer that is inserted in advance in an upper portion of a hollow pile in order to remove a predetermined length from the upper end of the hollow pile.

  Conventionally, as a pile spacer, a partition plate held by an annular support is attached in the lower part of a main body obtained by rolling a synthetic resin foam plate so as to be inserted into the hollow pile, and the lower part is inserted into the main body inserted in the hollow pile. The concrete inlet that rises from the entrance is narrowed, and the concrete that hardens in the main body and the concrete that hardens in the lower part of the concrete are separated, making it easy to divide both concrete and pulling means to the main body when pulling out As a connecting member, a pull-out support plate made of a strong material such as an iron plate is attached to the outer surface of the main body, facing each other in the radial direction and projecting one end from the upper end of the main body, and cutting the main body vertically Are known (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 10-273913 JP 2000-96558 A

  However, the conventional pile spacer provided with the above-mentioned drawing support plate has the following problems.

  (1) The pulling support plate is made of a thick iron plate having a certain width so as to withstand traction force, and cannot be bent along the inner surface of the hollow pile. For this reason, when a conventional pile spacer is inserted into a hollow pile, a gap is likely to occur around the drawing support plate, and it is necessary to remove the concrete that has entered the gap and hardened after the pile spacer is pulled out. It may become.

  (2) Since the pull-out support plate is heavy, the entire pile spacer is heavy and difficult to carry, and one end of the pull-out support plate that protrudes from the upper end of the main body easily hits the main body of other pile spacers or other loads during transportation. The handling is bad.

  (3) One end of the pull-out support plate protruding from the upper end of the main body is likely to cause injury by the operator tripping over or colliding with it.

  (4) Special equipment and tools are required for the formation of the pull-out support plate and the processing for attaching it to the main body, and it takes time and effort.

  The present invention has been made in view of the above-described conventional problems, and is a pile in which a partition plate held by an annular support is attached to a lower portion of a main body in which a synthetic resin foam plate is rolled so as to be inserted into a hollow pile. In the spacer, the occurrence of a gap between the inner surface of the hollow pile and the pile spacer can be suppressed without impairing the pullability of the pile spacer, and the handleability, safety, and productivity of the pile spacer can be improved. The purpose is to do so.

  To achieve the above object, according to a first aspect of the present invention, at least one traction belt is provided in a pile spacer in which a partition plate held by an annular support is attached in a lower portion of a main body obtained by rolling a synthetic resin foam plate. The outer surface of the main body is cut longitudinally, the main body is crossed in the radial direction at the lower end, and then the outer surface of the main body is cut again, and both ends extend outward from the upper end of the main body. The present invention provides a pile spacer characterized in that a traction means can be connected to each end of the traction belt extending outward.

  Further, according to a second aspect of the present invention, in a pile spacer in which a partition plate held by an annular support is attached in a lower part of a main body obtained by rolling a synthetic resin foam plate, a plurality of traction belts are respectively provided on the main body. The outer surface is cut vertically and the thick wall of the main body is crossed at the lower end, then the inner surface of the main body is cut vertically, and both ends extend outward from the upper end of the main body, and outward from the upper end of the main body. The pile spacer is characterized in that each of the traction means can be connected to the end of the traction belt extending in the direction.

  Further, according to a third aspect of the present invention, in a pile spacer in which a partition plate held by an annular support is attached in a lower portion of a main body obtained by rounding a synthetic resin foam plate, a plurality of traction belts are respectively provided on the outer surface of the main body. The lower end is attached to and attached to the annular support, the upper end extends outward from the upper end of the main body, and the end of the traction belt that extends outward from the upper end of the main body, The present invention provides a pile spacer characterized in that each of the traction means can be connected.

The first to third aspects of the present invention are respectively
The outer surface of the tow belt is covered with a protective band,
A plurality of bar-shaped reinforcing materials made of synthetic resin foam extending in the longitudinal direction are attached to the inner surface of the main body at intervals in the circumferential direction,
An intermediate ring is fitted in the holding groove formed across the reinforcing material in the longitudinal middle part of the main body,
A belt-like lower stopper made of a synthetic resin foam having a larger expansion ratio than the synthetic resin foam constituting the main body is attached to the outer peripheral surface of the lower end side of the main body,
The outer peripheral surface of the lower end of the lower stopper is a tapered surface that reduces the outer diameter downward,
Is included as a preferred embodiment thereof.

  In the first to third pile spacers of the present invention, the member that connects the traction means at the time of pulling out is a traction belt, and is formed of a flexible belt made of synthetic fiber, natural fiber, metal fiber, or the like. be able to. Therefore, when the pile spacer of the present invention is inserted into the hollow pile, the attachment portion of the traction belt is easily adapted to the inner surface of the hollow pile, and a gap is not easily formed between the inner surface of the hollow pile. Moreover, since the said material is lightweight and workability is good, the pile spacer of this invention is excellent in a handleability, safety | security, and productivity.

  In the first pile spacer of the present invention, one traction belt is attached so as to cross the lower end of the main body in the radial direction and embrace the entire main body in a U shape. In the second pile spacer of the present invention, the plurality of traction belts are attached so as to cross the thick surface of the main body and embrace the peripheral wall portion of the main body in a U shape. In the third pile spacer of the present invention, a plurality of traction belts are attached so as to embrace the entire main body in a U shape via an annular support that holds the partition plate. In other words, the traction belt is attached in a state where the traction belt is wrapped around the lower end of the main body and firmly grasped the main body, and the pulling force applied to the traction belt can be reliably transmitted to the main body side. Pullability is obtained.

  The present invention will be described below with reference to the drawings. In the present specification, the top and bottom of the main body means the top and bottom in the state when the main body is inserted into the hollow pile, the vertical direction means the vertical direction, and the horizontal direction means a direction perpendicular to the vertical direction. In the drawings described below, the same reference numerals denote the same members.

  First, based on FIGS. 1-7, the 1st example of the pile spacer of this invention is demonstrated.

  As shown in FIG. 1, the pile spacer of this example includes a main body 2 that is rounded to a size that can be inserted into a hollow pile 1 (see FIGS. 5 to 7). The main body 2 is composed of a synthetic resin foam plate, and is rounded in a state where the diameter can be expanded by an elastic restoring force to return to a flat state, and is usually a string or a tape (not shown) ) Is wound and temporarily fixed to prevent diameter expansion.

  On the inner surface of the main body 1, it is preferable that a large number of vertical grooves 3 extending in the vertical direction of the main body 2 are formed in parallel to facilitate rounding. The interval between the vertical grooves 3 is preferably wider at the center than the left and right sides of the main body 2 when the main body 2 is widened. Specifically, it is preferable that the interval between the vertical grooves 3 at the center is 1.5 to 2 times the interval between the vertical grooves 3 at both sides. By making the interval between the longitudinal grooves 3 wide at the central portion of the main body 2, an appropriate elastic restoring force can be maintained at the central portion of the main body 2, and the pile spacers are stacked and stored or transported. In this case, it is possible to easily prevent the collapse. The reason why the interval between the longitudinal grooves 3 is narrowed on both side portions of the main body 2 is to make it easier to bend the both side portions of the main body 2 which are difficult to be bent in an arc shape.

  What is necessary is just to determine the depth of the said vertical groove 3, a width | variety, and a space | interval according to the thickness of the main body 2, a material, a foaming magnification, etc. Moreover, although the cross-sectional shape of the vertical groove | channel 3 may be a square or a semicircle, since it becomes easy to round, it is preferable that it is V shape or an inverted triangle shape.

  Examples of the synthetic resin foam constituting the main body 2 include foams such as polystyrene-based synthetic resins and polyolefin-based synthetic resins. It is preferable because it is strong and excellent in flexibility and elasticity, and is easy to adhere to the inner surface of the hollow pile 1 (see FIGS. 5 to 7) without causing cracks or chipping, and has an advantage that concrete does not easily adhere. 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, more preferably 20 to 50 times, in order to obtain necessary strength, elasticity, and the like. Moreover, the thickness of the main body 2 composed of the polyolefin-based synthetic resin foam is such that it is easily swayed from side to side using its elasticity at the time of separation and removal of the hardened concrete 4 (see FIGS. 6 and 7) described later. It is preferable that it is 20-50 mm.

  As shown in FIGS. 1 and 2, a traction belt 5 is attached to the main body 2. The traction belt 5 of this example is formed in a U-shape in which the outer surface of the main body 2 is cut vertically, the main body 2 is crossed in the radial direction at the lower end, and then the outer surface of the main body 2 is cut again. It is attached to the main body 2 by tightening bolts 6 that pass through at intervals. Further, both ends of the traction belt 5 extend outward from the upper end of the main body 2.

  In the present example, one traction belt 5 is attached in a U shape as described above, but two or more traction belts can be attached in the same manner. The traction belt 5 is preferably attached so that a shallow groove is formed on the outer surface of the main body 2 as an attachment position so that the surface of the traction belt 5 is as flat as possible with respect to the outer surface of the main body 2. Further, it is preferable that the bolt 6 is tightened with a backing plate 7 interposed between the inner surface of the main body 2. The backing plate 7 is preferably a low foamed plate of polyolefin resin.

  The bolt 6 is tightened through the traction belt 5 and the main body 2, and at the same time, the bolt 6 also penetrates the vertical piece of the L-shaped metal fitting 8 provided on the inner surface side of the main body 2. The metal fitting 8 is fixed to the main body 2 with its horizontal piece protruding inward. Although the L-shaped metal fitting 8 is not essential, it can be provided because the integrity of the concrete 4 (see FIGS. 6 and 7) hardened in the main body 2 and the main body 2 and the traction belt 5 can be improved. Is preferred. Further, the lowermost L-shaped metal fitting 8 also serves as a support material for an annular support 10 with a partition plate 9 described later.

  The traction belt 5 is made of a flexible belt made of, for example, synthetic fiber, natural fiber, metal fiber, etc., and the main body 2 is removed from the hollow pile 1 together with the concrete 4 hardened in the main body 2. When pulling out (see FIG. 7), the member is pulled by a pulling means such as a power shovel or a crane. Loop ends 11 are provided at both ends of the traction belt 5 extending outward from the upper end of the main body 2 so as to make it easy to connect traction means such as a power shovel or crane by hooking wires or hooks. Is formed.

  As shown in FIG. 2, an annular support 10 with a partition plate 9 is supported on the inner side of the lower end portion of the rolled body 2 while being supported on the L-shaped bracket 8 attached to the lowermost stage. It is attached.

  As shown in FIG. 3, the annular support 10 is an annular material formed of, for example, a steel bar, and the partition plate 9 is attached in advance. Moreover, the partition plate 9 is attached by opening the belt threading portion 12 at an opposing position. A portion of the traction belt 5 that crosses the lower end of the main body 2 in the radial direction is turned from the lower side of the annular support 10 to the upper surface side of the partition plate 9 through one belt passage portion 12 and the other belt passage. The annular support 10 with the partition plate 9 is attached to the main body 2 by zigzag from the portion 12 to the lower side of the annular support 10.

  The partition plate 11 narrows the inlet of the concrete 4 (see FIG. 6) that rises from below into the main body 2 inserted into the hollow pile 1 and hardens in the main body 2, and the concrete 4 It is for partitioning between the concrete 4 which hardens below and making it easy to divide both. The partition plate 11 is made of a flexible sheet material such as rubber or synthetic resin (preferably a polyolefin-based synthetic resin), and a plurality of cross-cuts or radial cuts 13 are provided to avoid a portion where the traction belt 5 crosses. The tongue piece 14 is formed, and the inflow of the concrete 4 is allowed by turning up the tongue piece 14.

  Further, the annular support 10 with the partition plate 9 will be described. As shown in FIG. 4, the annular support 10 has a reinforcing bar 15 that is stretched over the inner periphery adjacent to the belt threading portion 12. can do. The reinforcing bar 15 is preferably provided in order to reinforce the annular support 10 when the diameter of the rounded main body 2 is increased. When the reinforcing bar 15 is provided, it is preferable that the traction belt 5 having passed through one belt passing portion 12 is turned to the upper side of the reinforcing bar 15 and then passed to the other belt passing portion 12. Further, the partition plate 9 may be provided with a small hole or a narrow opening in addition to the slit 12 formed with a plurality of tongue pieces 13.

  On one of the left and right sides of the main body 2, a thin overlapping piece 16 is provided that is overlapped on the other side when the main body 2 is rolled. The overlapping piece 16 can be formed integrally with the main body 2 or can be provided on the main body 2 by welding or bonding. The overlapping piece 16 is not essential, but if the overlapping piece 16 is provided, both side edges when the main body 2 is rolled can be overlapped without causing a large step on the outer surface side. The entire outer periphery of the main body 2 is easily adhered to the inner surface of the hollow pile 1 (see FIGS. 5 to 7).

  The overlapping piece 16 is also preferably made of a polyolefin-based synthetic resin like the main body 2. In addition, although the overlapping piece 16 is formed thinly, if it is stiff, it is easy to perform the overlapping operation when the body 2 is rolled up, so that the non-foamed polyolefin synthetic resin or the expansion ratio is 50 times. The following polyolefin-based synthetic resin foam is preferable. In the case of a polyolefin-based synthetic resin foam, it is particularly preferable that the expansion ratio is 5 to 50 times.

  A band-shaped upper stopper 17 and a lower stopper 18 made of a synthetic resin foam having a larger expansion ratio than the synthetic resin foam constituting the main body 2 are attached to the outer peripheral surfaces on the upper and lower ends of the main body 2. The upper stopper 17 and the lower stopper 18 are interposed between the outer surface of the main body 2 and the inner surface of the hollow pile 1 (see FIGS. 5 to 7) to some extent, and the synthetic resin constituting the main body 2. By being made of a synthetic resin foam having a larger expansion ratio than that of the foam, it is more easily elastically compressed than the main body 2.

  In particular, the lower stopper 18 functions as a sealing member that prevents the concrete 4 rising from below from entering between the outer surface of the main body 2 and the inner surface of the hollow pile 1 (see FIG. 6). It is preferably provided at the end. In addition, if the lower stopper 18 is provided, it is possible to prevent the concrete 4 from entering between the main body 2 and the hollow pile 1 without strongly adhering the entire outer peripheral surface of the main body 2 to the inner surface of the hollow pile 1. Can be easily pulled out, and the load applied to the traction belt 5 when the main body 2 is pulled out can be reduced.

  The upper stopper 17 is for stabilizing the insertion state of the main body 2 in the hollow pile 1 by balancing the fitting state on the lower end side where the lower stopper 18 is provided and the fitting state on the upper end side. The main body 2 is preferably provided at the upper end side end. Further, the upper stopper 17 and the lower stopper 18 also reinforce the end portion of the main body 2.

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

  First, as shown in FIG. 5, the main body 2 to which the above-described annular support 10 with the partition plate 9 and the like are attached, rolled and temporarily fixed is inserted into the hollow pile 1.

  Presser foot so that the pile spacer is not lifted by the concrete 4 rising in the hollow pile 1 when the hollow pile 1 is built in the pile pile injected with concrete 4 for solidifying (see FIGS. 6 and 7). It is preferable to hold the pile spacer by holding a bar 19 (generally called a barb) to the steel frame 20 at the upper end of the hollow pile 1 by welding or the like. Instead of the presser bar 19, a string (not shown) is attached in advance in the vicinity of the hanging part 11 of the traction belt 5, and this string is provided on the iron frame 20 at the upper end of the hollow pile 1 such as a crane. The above-described lifting can be prevented by binding to a claw (not shown) that is hung on the hanging chuck. If this string is used, the trouble of removing the presser bar 19 that has been welded can be omitted when the pile spacer is removed.

  Further, for example, a tape fastener is used so that the ends of the pulling belt 5 extending upward are connected to each other so that the ends are connected to each other so that the ends of the pulling belt 5 do not hang down and are fixed to the concrete 4. It is preferable to provide a belt connecting means (not shown) such as a binding band or the like.

  This pile spacer can be inserted and used while releasing the temporary fixing. When the temporary fixing is released, the main body 2 elastically recovers and expands in diameter, thereby closely contacting the inner surface of the hollow pile 1. For this reason, it is possible to use the same pile spacer for different types of hollow piles 1 having different diameters as well as unevenness and inner diameter errors of the inner surface of the hollow pile 1. Moreover, it is easy to adhere to the inner surface of the hollow pile 1 and leaves almost no gap between the main body 2 and the inner surface of the hollow pile 1. Therefore, in addition to the fact that the concrete rising 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 made of a polyolefin-based synthetic resin foam to which the concrete is difficult to adhere, It is easier to remove the pile spacer including the main body 2.

  The main body 2 that is rounded and temporarily fixed can be used by inserting it into the hollow pile 1 as it is without releasing the temporary fixing. Even if the temporary fixing is not released, the rolled main body 2 expands so that the portion around which the temporary fixing string or tape is wound is constricted by the concrete flowing into the inside. Therefore, if the outer diameter of the main body 2 that is rounded and temporarily fixed compared to the inner diameter of the hollow pile 1 is not extremely small, the main spacer 2 can be sufficiently attached to the inner surface of the hollow pile 1 even with the temporary pile spacer. In addition, the workability of inserting into the hollow pile 1 is improved.

  After this pile spacer is set in the hollow pile 1 as shown in FIG. 5, the hollow pile 1 is laid in a pile pile injected with concrete 4 for consolidation as shown in FIG. Sinking is performed by hanging 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 while rubbing the side wall of the pile. In some cases, the hollow pile is lowered rapidly. For this reason, large stones and rubble are pushed up together with the concrete rising in the hollow pile 1, and this may be rolled into the main body 2 inserted. If a large stone or rubble fits firmly into the main body 2, it becomes difficult to pull out the pile spacer after curing. If the partition plate 9 is attached using the annular support 10 with the reinforcing bar 15 as shown in FIG. 4, there is an advantage that it is easy to prevent such large stones and rubble from entering the main body 2.

  After curing, as shown in FIG. 7, the hardened concrete 4 in the main body 2 is divided from the hardened concrete 4 below, and the entire pile spacer is extracted and removed. This parting removal is performed by hanging a wire or hook on the hanging portion 11 of the traction belt 5, connecting it to a traction means such as a power shovel or clay, and further swinging left and right if necessary. Since the traction belt 5 is attached to the outer surface side of the main body 2, the pulling of the traction belt 5 toward the center direction of the hollow pile 1 can be facilitated to facilitate the peeling between the main body 2 and the inner surface of the hollow pile 1. In particular, as shown in FIG. 7, when a wire or the like is hung in an inverted Y shape and pulled upward, the pulling force of the pulling belt 5 toward the center of the hollow pile 1 is automatically applied. It becomes even easier.

  Since this pile spacer is made of a material in which the concrete does not easily enter between the main body 2 and the inner surface of the hollow pile 1 as described above, and the main body 2 is difficult to adhere to the concrete 4, the main body 2 and the hollow pile 1 are separated from each other. It is hard to join strongly. Even if some concrete 4 enters between the main body 2 and the inner surface of the hollow pile 1, as described above, the pulling belt 5 is tilted toward the center of the hollow pile 1 to pull the main body 2 and the inner surface of the hollow pile 1. Can be easily removed. Further, in order to facilitate drawing, it is also effective to apply a release agent to the outer surface of the main body 2.

  By the way, depending on the geology and construction state of the position where the hollow pile 1 is embedded, the concrete 4 may not rise up to the upper portion of the hollow pile 1, and the earth and sand may be pushed up instead. In this case, although the inside of the main body 2 is filled with earth and sand, since the earth and sand does not harden like the concrete 4, the pulling force applied to the towing belt 5 is not dispersed and is concentrated on the towing belt portion. It becomes easy. In such a state, only the traction belt 5 is detached from the main body 2 and pulled out, and the earth and sand and the main body 2 tend to remain, but the traction belt 5 crosses the lower end of the main body 2 in the radial direction. Therefore, a pulling force can be reliably applied to the main body 2, and the whole can be easily pulled out together with the earth and sand even in the above state.

  After removing the pile spacer and the hardened concrete 4 or earth and sand in the main body 2 in this way, a cage-like rebar is inserted into the space above the hollow pile 1 opened thereby, and the underground beam Construction will proceed.

  FIGS. 8 to 11 show a second example of the present pile spacer. After the two traction belts 5 cross the outer surface of the main body 2 and cross the thick surface of the main body 2 at the lower end. The main body 2 is attached in a U-shape that is longitudinally cut. In addition, both ends of each traction belt 5 extend outward from the upper end of the main body 2 and are connected in a loop shape to constitute a hanging portion 11.

  In the partition plate 9 of the pile spacer of this example, as shown in FIG. 10, since the traction belt 5 does not cross over the partition plate 9 as in the first example, the notch 13 that forms the tongue piece 14 is formed. Can be formed at the center of the partition plate. Further, as shown in FIG. 11, the annular support 10 can be provided with the reinforcing bar 15 as in the first example described above.

  The pile spacer of this example is the same as that of the above-mentioned 1st example except said point. Further, in this example, the two traction belts 5 are attached at positions almost opposite to each other, but three or more traction belts 5 are provided at substantially equal intervals in the circumferential direction of the rolled main body 2. You can also.

  12 is a view showing a case where the intermediate ring 21 is attached to the pile spacer according to the first example, and FIG. 13 is a view showing a case where the intermediate ring 21 is attached to the pile spacer according to the second example.

  In any case, the hook portion 22 is attached to the longitudinal direction intermediate portion of the main body 2 by the bolt 6 with the abutting plate 7 sandwiched between the main body 2. The hook portion 22 is for attaching through the intermediate ring 21.

  The intermediate ring 21 has a split ring with a diameter substantially equal to the inner diameter of the main body 2 when it is rolled (usually slightly smaller than the inner diameter of the main body 2). It is intended to prevent crushing when piled up for storage or transportation. Therefore, it is preferable to provide the intermediate ring 21 for a pile spacer that has a large diameter and is easily crushed. Further, since the intermediate ring 21 is split and can be elastically reduced in diameter, the diameter of the intermediate ring 21 is slightly larger than the inner diameter of the main body 2 when it is rounded. The outer surface of the main body 2 can be brought into close contact with the inner surface of the hollow pile 1 by using the elastic restoring force of the intermediate ring 21 after the insertion.

  FIGS. 14 to 16 show a third example of the present pile spacer, in which two traction belts 5 each cut through the outer surface of the main body 2, and lower ends each having an annular support 10 with a partition plate 9. It is connected to. Therefore, the traction belt 5 of this example is connected via the annular support 10, and as a whole, like the first example, the main body 2 is held in a U-shape. For this reason, similarly to the first example, the pulling force applied to the traction belt 5 is easily transmitted to the main body 2. Further, the upper end of each traction belt 5 extends outward from the upper end of the main body 2 and is connected in a loop shape to constitute a hanging portion 11.

  A protective band 23 is attached to the outer surface of the traction belt 5 in this example, and the protective band 23 covers the outer surface of the traction belt 5. The protective band 23 is a band made of the same material as the backing plate 7 in the first and second examples, and prevents the bolt 6 from directly hitting the traction belt 5 and damaging it. This is to prevent the traction belt 5 from rubbing against the inner surface of the hollow pile 1 directly. This protective band 23 is preferably provided so as to cover at least the traction belt 5 exposed on the peripheral surface of the main body. It can also be provided on the traction belt 5 in the first and second examples.

  In the lower end portion of the main body 2 in this example, a thick upward portion of the main body 2 is sandwiched with the traction belt 5 and the protective band 23 and fixed with bolts 6 at positions facing each other in the circumferential direction. An end fitting 24 is provided. The lower inner side of the end fitting 24 is a holding portion 25 bulging outward, and the annular support 10 is passed through the holding portion 25. Although this end metal fitting 24 is not essential, when it is provided, the attachment state of the annular support 10 with the partition plate 9 can be stabilized.

  Further, a plurality of bar-shaped reinforcing members 26 made of a synthetic resin foam extending in the vertical direction are attached to the inner surface of the main body 2 in this example at intervals in the circumferential direction. The reinforcing material 26 can be made of a synthetic resin foam similar to that of the main body 2. If the reinforcing material 26 is provided, it becomes easy to prevent the main body 2 from being compressed in the vertical direction by the pressure of the concrete rising from below, so that the main body 2 can be thinned.

  If the reinforcing material 26 is further provided, the intermediate ring 21 as described above can be attached using the reinforcing material 26. That is, as shown in FIGS. 15 and 16, a holding groove 27 crossing the reinforcing material 26 is provided at an appropriate position of the reinforcing material 26, and the intermediate ring 21 is fitted into the holding groove 27, thereby The intermediate ring 26 can be attached without using the.

  In this example, as shown in FIGS. 15 and 16, the intermediate ring 21 is also pressed by the presser belt 28 attached to the main body 2 with the bolt 6, but the presser belt 28 holds the intermediate ring 21. This is intended to facilitate the rounding of the main body 2 while being held at a predetermined position, and is not essential.

  The reinforcing member 26 may extend from the upper end to the lower end of the main body 2, but the main body 2 does not interfere with the flow of the concrete flowing in by rolling up the tongue 14 (see FIG. 15) of the partition plate 9. It is preferable to stop it slightly above the lower end.

  The outer peripheral surface of the lower end portion of the lower stopper 18 in this example is a tapered surface 29 that reduces the outer diameter downward. If this tapered surface 29 is provided, the main body 2 can be easily inserted into the hollow pile 1.

  FIG. 17 shows another example of the main body 2, and the inner edge of the lower end portion of the main body 2 is a tapered surface 30 whose inner diameter is enlarged downward. In this way, the concrete 4 that rises when the hollow pile 1 is laid in the pile pile injected with the concrete 4 for consolidation (see FIG. 7) is tapered as shown by the arrows in FIG. It flows along the surface 30 and presses the lower end of the main body 2 against the inner surface of the hollow pile 1. Accordingly, it is difficult for the concrete 4 to enter between the main body 2 and the inner surface of the hollow pile 1.

It is a perspective view which shows the 1st example of the pile spacer of this invention. It is an expanded sectional view which omitted a part of pile spacer concerning the 1st example. It is a perspective view which shows an example of the annular support part part with a partition plate in the pile spacer which concerns on a 1st example. It is a perspective view which shows the other example of the annular support part part with a partition plate in the pile spacer which concerns on a 1st example. It is sectional drawing which shows the state which set the pile spacer which concerns on a 1st example to the upper part of a hollow pile. It is sectional drawing which shows the state which set the hollow pile which set the pile spacer which concerns on a 1st example to the stake pile which injected the solidified concrete. It is sectional drawing of the state in the middle of extracting the hardened concrete in the pile spacer which concerns on a 1st example from the hardened concrete of the lower part. It is a perspective view which shows the 2nd example of the pile spacer of this invention. It is an expanded sectional view which omitted a part of pile spacer concerning the 2nd example. It is a perspective view which shows an example of the annular support part part with a partition plate in the pile spacer which concerns on a 2nd example. It is a perspective view which shows the other example of the annular support part part with a partition plate in the pile spacer which concerns on a 2nd example. It is a section perspective view of the middle part of a main part showing the state where the intermediate ring was attached to the pile spacer concerning the 1st example. It is a section perspective view of the middle part of a main part showing the state where the intermediate ring was attached to the pile spacer concerning the 2nd example. It is a perspective view which shows the 3rd example of the pile spacer of this invention. It is an enlarged plan view of the pile spacer which concerns on a 3rd example. It is the expanded sectional view which omitted a part of pile spacer concerning the 3rd example. It is sectional drawing which shows the other example of a main-body lower part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow pile 2 Main body 3 Vertical groove 4 Concrete 5 Traction belt 6 Bolt 7 Cover plate 8 L-shaped metal fitting 9 Partition plate 10 Annular support 11 Hanging part 12 Belt passing part 13 Cut 14 Tongue piece 15 Reinforcement bar 16 Overlapping piece 17 Upper part Stopper 18 Lower stopper 19 Presser bar 20 Iron frame 21 Intermediate ring 22 Hook part 23 Protective band 24 End fitting 25 Holding part 26 Reinforcement material 27 Holding groove 28 Presser belt 29 Tapered surface 30 Tapered surface

Claims (8)

In the pile spacer in which the partition plate held by the annular supporter is attached in the lower part of the body rounded the synthetic resin foam plate,
At least one traction belt is attached by longitudinally cutting the outer surface of the main body, traversing the main body in the radial direction at the lower end, and then longitudinally cutting the outer surface of the main body again. Both ends extend outward from the upper end of the main body. A pile spacer, characterized in that a pulling means can be connected to each end of the pulling belt extending outward from the upper end of the main body. In the pile spacer in which the partition plate held by the annular supporter is attached in the lower part of the body rounded the synthetic resin foam plate,
A plurality of traction belts are installed by cutting the outer surface of the main body vertically, traversing the thick wall of the main body at the lower end, and then cutting the inner surface of the main body vertically, and both ends are outward from the upper end of the main body. A pile spacer, characterized in that a traction means can be connected to each end of the traction belt that extends and extends outward from the upper end of the main body. In the pile spacer in which the partition plate held by the annular supporter is attached in the lower part of the body rounded the synthetic resin foam plate,
A plurality of traction belts, each having a longitudinal section on the outer surface of the main body, and a lower end connected to an annular support, are attached to the upper end, and each upper end extends outward from the upper end of the main body. A pile spacer, characterized in that a traction means can be connected to each end of the traction belt extending in the direction.   The pile spacer according to any one of claims 1 to 3, wherein an outer surface of the traction belt is covered with a protective band.   A plurality of rod-shaped reinforcing members made of a synthetic resin foam extending in the longitudinal direction are attached to the inner surface of the main body at intervals in the circumferential direction. Pile spacer as described.   The pile spacer according to claim 5, wherein an intermediate ring is attached to a longitudinally intermediate portion of the main body so as to be fitted into a holding groove formed across the reinforcing material.   7. A belt-like lower stopper made of a synthetic resin foam having a larger expansion ratio than that of the synthetic resin foam constituting the main body is attached to the outer peripheral surface of the lower end side of the main body. The pile spacer as described in the item.   The pile spacer according to claim 7, wherein an outer peripheral surface of a lower end portion of the lower stopper is a tapered surface whose outer diameter is reduced downward.

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