JP2009013610A - Extra-banking concrete collecting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extra-banking concrete collecting tool, easily removing extra-banking concrete in a semi-hardened state, reusable and having high strength. <P>SOLUTION: This extra-banking concrete collecting tool 100, which is mounted on the top of a reinforcement cage 31, comprises: a collecting tool body 11 formed of an annular plate material, in which a tremie hole 11a is formed in the center, and radial slits 13 are formed in the periphery of the tremie hole 11a; and a circumferential rib 12 provided on the peripheral edge part of the collecting tool body 11, wherein the peripheral edge part of the collecting tool body 11 is reinforced by the circumferential rib 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pile-concrete collecting tool for pile head treatment used to efficiently remove surplus concrete when constructing cast-in-place concrete piles, and in particular, remove surplus concrete before hardening. It is related with the surplus concrete collection tool suitable for doing.

  Conventionally, when a cast-in-place concrete pile is constructed, the ground is excavated with a machine by an earth drill method or the like to form a circular hole, and a stable liquid such as bentonite liquid is filled in the hole to drill the hole. After stabilizing the wall, by installing a cylindrical rebar rod in the drill hole, then inserting a tremy tube into the rebar rod, and pouring concrete into the drill hole from the treme tube, Reinforced concrete piles (concrete piles) are constructed. However, when the concrete is driven in, the concrete entrains muddy water or the earth and sand of the hole wall, so that the quality of the concrete on the top of the pile is deteriorated. Therefore, extra reinforcement is performed to ensure the quality of the concrete on the upper part of the pile, and after the concrete is cured, the above-mentioned reinforcing steel is fixed to the upper structure or its foundation by performing pile head treatment such as scooping the extra-concrete concrete. The main muscles of the heel are exposed.

On the other hand, a method is proposed in which a surplus concrete recovery tool is installed at the pile head, and the surplus concrete that has not yet been solidified (semi-cured state) stored in the jig is lifted and removed. ing. 9 (a) and 9 (b) are diagrams showing an example thereof, which is composed of an assembly of a plurality of hollow pipes 41 penetrating in the vertical direction inside the main reinforcing bar 32 at the upper end of the reinforcing bar 31, and a central portion thereof. A surplus concrete collecting tool 40 in which a through hole 42 for introducing the tremy pipe 50 is formed is installed, and the surplus concrete D is stored in the hollow pipe 41. Thereafter, in a state where most of the surplus concrete D is not yet solidified, the surplus concrete recovery tool 40 is lifted by using a lifting tool such as a wire 45, and the surplus concrete D is removed (for example, patent document). 1).
Moreover, the method using the gutter member 60 as shown to Fig.10 (a) is also proposed as a surplus concrete collection tool. The flange member 60 has a lattice-shaped reinforcing bar 62 attached to a ring-shaped frame member 61, a vertical bar 63 attached to the frame member 61, and a ring-shaped horizontal bar 64 attached to the vertical bar 63 to form a hook shape. Therefore, an opening 65 for penetrating the tremy tube 50 is formed in the central portion of the lattice-like reinforcing bar 62. As shown in FIG. 10 (b), this saddle member 60 is also provided with the end portion of the vertical bar 63 attached to a hanging tool 66 or the like, as shown in FIG. 10 (b), and extra concrete stored in the saddle member 60. The heel member 60 is lifted in a state where D is not yet solidified, and the surplus concrete D is removed (see, for example, Patent Document 2).
JP 2005-113375 A JP-A-11-247187

However, since the above-described surplus concrete collecting tool 40 is configured by connecting a plurality of hollow pipes 41, the jig itself is high in height and heavy, so that not only the production cost is high, but also the transportation efficiency. There was a problem that was not good.
On the other hand, although the eaves member 60 has a simple structure and can be easily manufactured, the eaves member 60 has a structure in which lattice-like reinforcing bars 62 are attached to the frame member 61. When the member 60 is lifted, a large stress is applied between the grid-like reinforcing bars 62 and the frame member 61 due to the weight of the extra-concrete concrete D. As a result, the grid-like reinforcing bars 62 are below the frame member 61. There was a deformation that hangs down to the side. Therefore, when the reed member 60 is reused, it is necessary to repair the deformed lattice-shaped reinforcing bars 62 and return them to the original state.

  The present invention has been made in view of the conventional problems, and can provide a high-strength, high-strength concrete recovery tool that can easily remove semi-cured surplus concrete and can be reused. Objective.

The invention described in claim 1 of the present application is attached to the tip of a reinforcing bar built in a drilled hole for constructing a cast-in-place concrete pile, and for recovering the surplus concrete before hardening. An annular member formed with an introduction hole for introducing a tremely tube and a plurality of slits, and provided at a peripheral portion of the annular member, and protrudes to the upper side of the annular member. A circumferential rib is provided.
Invention of Claim 2 is the surplus concrete collection | recovery tool of Claim 1, Comprising: In addition to the said circumferential rib, it protrudes in the upper part side of the said annular member, and is radial to the said annular member. Extending radial ribs are provided.
The invention according to claim 3 is the extra-concrete recovery tool according to claim 1 or claim 2, and includes a support pipe having a hollow portion into which the tremy pipe is introduced.
Invention of Claim 4 is the surplus concrete collection | recovery tool of Claim 1, Comprising: The said cyclic | annular member was formed by connecting pieces which divided | segmented the cyclic | annular member into the circumferential direction several pieces It is characterized by being.
The invention according to claim 5 is the extra-concrete recovery tool according to claim 4, wherein the split surface side that becomes the connecting portion of the piece projects to the upper side of the piece along the split surface. And extending in the radial direction, and the radial ribs of the adjacent pieces are connected to each other.

The surplus concrete collecting tool of the present invention includes an annular member in which an introduction hole and a plurality of slits for introducing a treme tube are formed, and an upper side of the annular member provided at a peripheral edge of the annular member. The peripheral ribs projecting in a simple manner are not only easy to manufacture, transport and attach, but also because the peripheral edge of the annular member is reinforced by the circumferential ribs. Since the deformation of the member is difficult to occur, it can be reused as it is after the surplus concrete is removed. At this time, if a radial rib is provided in addition to the circumferential rib, the strength of the annular member can be further increased.
Furthermore, if a support tube into which the tremy tube is introduced is provided, the tremey tube can be easily introduced as compared with the case where only the introduction hole is provided. If these are connected, the strength of the annular member can be further increased.
Moreover, if the said cyclic | annular member shall be what connected the pieces which divided | segmented the cyclic | annular member into several in the circumferential direction, attachment of a surplus concrete collection | recovery tool will become still easier.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
Best Mode 1.
FIGS. 1A and 1B are diagrams showing the configuration of the surplus concrete recovery tool 10 according to the best mode 1. FIG. In the figure, reference numeral 11 denotes a collection tool main body, and the collection tool main body 11 is constituted by an annular plate member having a tremey hole 11a formed in the center. 12 is a circumferential rib provided on the peripheral edge of the collection tool main body 11, 13 is a slit provided around the tremey hole 11a, and 14 is a peripheral edge of the collection tool main body 11 inside the circumferential rib 12. 15 is a cover member attached so as to close the tremey hole 11a, and 16 is a release material attached to the back side of the collection tool main body 11 (a drilling side indicated by reference numeral 30 in the figure). It is.
The tremey hole 11a is a hole through which the tremey pipe 50 for injecting concrete into the drilling hole 30 in which the reinforcing bar 31 formed in a cylindrical shape by combining the linear main reinforcing bar 32 and the annular hoop bar 33 is installed. The diameter is larger than the outer diameter of the tremmy tube 50.
The circumferential rib 12 is an annular member for reinforcing the peripheral edge of the recovery tool main body 11 and is provided so as to protrude upward from the peripheral edge on the surface side of the recovery tool main body 11.
The slits 13 are a plurality of elongated gaps provided radially around the tremey hole 11a along the radial direction of the recovery tool body 11, and slime that floats above the concrete when the concrete is driven from the slits 13 Defective concrete is allowed to enter the surface side of the recovery tool main body 11.
The circumferential rib 12 is a reinforcing member, and is not intended to house the surplus concrete formed in the upper portion of the recovery tool main body 11 by entering from the slit 13. The height H shown in FIG. 1 is sufficient if H = 300 mm to 500 mm.
The through-hole 14 is a through-hole for penetrating the main bar 32 of the reinforcing bar 31 and is arranged in an annular shape in the same manner as the arrangement of the main bar 32.
The lid member 15 is a member made of an elastic member such as natural rubber or synthetic rubber. As shown in FIGS. 2 (a) and 2 (b), the lid member 15 is formed in an annular mounting portion 15a that is an outer peripheral portion and the inside thereof. A lid portion 15d composed of a plurality of substantially triangular lid pieces 15c divided by a plurality of cuts 15b, and is attached to the peripheral edge portion of the tremy hole 11a.
Further, the release material 16 is an annular member provided for easily peeling the recovery tool main body 11 from the concrete below the recovery tool main body 11, and corresponds to the lid member 15 as shown in FIG. Holes 16a, 16b, and 16c are provided at the position, the position corresponding to the slit 13, and the position corresponding to the through hole 14, respectively. As the material constituting the release material 16, a foamed cushioning material made of foamed resin such as an air cushion material, or a mineral oil-based or wax-based mold release agent is applied and dried.

Next, a method for removing the surplus concrete using the surplus concrete recovery tool 10 according to the present invention will be described.
First, as shown in FIG. 3, in order to reinforce the collection tool main body 11, the circumferential rib 12 is attached to the peripheral portion thereof, and then the attachment portion of the lid member 15 is attached to the peripheral portion of the tremey hole 11 a of the collection tool main body 11. 15a is attached using a fastening member such as a bolt (not shown). In this state, the tremey hole 11a is closed by the lid piece 15d of the lid member 15. Next, the peeling concrete 16 is attached to the back side of the recovery tool body 11 to assemble the surplus concrete recovery tool 10. At this time, the release material 16 is attached to the recovery tool body 11 so that the positions of the holes 16b, 16c of the release material 16 and the slits 13 and the through holes 14 of the recovery tool body 11 are aligned. Thereafter, the surplus concrete collecting tool 10 is installed on the distal end side of the reinforcing bar 31 through the main bar 32 of the reinforcing bar 31 through the through hole 14 of the collecting tool main body 11.
When placing concrete, the treme tube 50 is inserted into the hole 30 from the treme hole 11a of the recovery tool body 11, and the kneaded concrete is poured into the hole 30 while the treme tube 50 is poured into the hole 30. The pipe 50 is gradually pulled up. At this time, the lid piece 15c of the lid member 15 is expanded by the tremy tube 50 (see FIG. 2B).
When the concrete is filled up to the lower surface of the recovery tool main body 11, first, freezing water in which earth and sand particles floated enters the upper surface side of the recovery tool main body 11 from the slit 13, and then a defect in which earth and sand having a low specific gravity are involved. Concrete enters. At this time, the lifting pressure of the placed concrete acts to lift the surplus concrete collecting tool 10, but there is no problem if a heavy material such as an iron plate is used for the collecting tool body 11. In addition, when the thickness of the collection tool main body 11 is reduced to reduce the weight, a weight for preventing lifting is placed on the collection tool main body 11 or a holding jig is provided on the tremy tube 50. For example, if the recovery tool body 11 is pressed downward, the surplus concrete recovery tool 10 will not rise. Further, the rising of the surplus concrete collecting tool 10 can also be prevented by slowing the concrete placing speed when the concrete is filled to the vicinity of the lower surface of the collecting tool main body 11.
Furthermore, as the filling continues, the quality of the infiltrating concrete gradually improves. Since the reinforcing circumferential rib 12 of this example does not have a function of a partition wall for storing the defective concrete that has entered through these slits 13, the defective concrete is, as shown in FIG. While spreading to the outside of the circumferential rib 12, it accumulates on the upper part of the collection tool main body 11.
Thereafter, the injection of the concrete is finished at an appropriate surplus height at which the concrete (pile concrete) A on the lower surface of the recovery tool main body 11 is a high-quality concrete.

The surplus concrete deposited on the upper surface of the recovery tool main body 11 becomes a semi-hardened state in about 2 hours after the completion of the pouring or in about 30 minutes after the strength of the concrete is developed. This semi-cured state is a state where the slump is 10 cm to 15 cm.
The tremy tube 50 is usually configured by connecting a plurality of unit tubes having a predetermined length. When the tremy pipe 50 is pulled up, the unit pipes are removed one by one while pulling up the tremy pipe 50. Therefore, after the concrete is poured, the last unit pipe 50Z remains as shown in FIG. Inside the unit pipe 50Z, the high-quality concrete B is in a state in which defective concrete C is deposited around it. Therefore, when the unit pipe 50Z is collected, as shown in FIG. 4 (b), the surplus concrete D composed of the high-quality concrete B and the defective concrete C is formed above the collection tool main body 11 as a boundary. Yes, there will be a state of good quality concrete that will be pile concrete A in the lower part. Here, as shown in FIG. 4 (c), if the extra concrete collecting tool 10 is lifted by wires 17 attached at one end to a plurality of locations of the circumferential rib 12, extra concrete. D (concrete B + concrete C) can be recovered while maintaining its shape. The wire 17 may be attached to the circumferential rib 12 after the extra concrete collecting tool 10 is assembled. The installation place of the wire 17 may be the collection tool main body 11, and in that case, it is preferably attached in the vicinity of the circumferential rib 12.
At the time when the pouring of the concrete is finished, the tremy pipe 50 is pulled up above the upper surface of the recovery tool body 11 or above it, so that the lid member 15 returns to the state when the extra concrete recovery tool 10 is attached. Yes. Therefore, the surplus concrete D on the upper surface of the recovery tool body 11 and the pile concrete A on the lower surface of the recovery tool body 11 are in a so-called edge cut state. Moreover, since the peeling material 16 is interposed between the recovery tool main body 11 of the surplus concrete recovery tool 10 and the pile concrete A, the surplus concrete recovery tool 10 can be easily separated from the pile concrete. it can.
At the time of recovery of the surplus concrete D, the weight of the surplus concrete D acts on the peripheral portion of the recovery tool main body 11 to distort the recovery tool main body 11 toward the drilling hole 30 side. Since the surplus concrete collecting tool 10 reinforces the collecting tool main body 11 with the circumferential rib 12, the collecting tool main body 11 is not deformed.
Further, since the surplus concrete D recovered by the surplus concrete recovery tool 10 is in a semi-hardened state, if the recovery tool 10 is turned upside down to screen out the surplus concrete D, the surplus concrete recovery tool The extra concrete D can be easily removed from 10. Therefore, after the removal of the surplus concrete D, the surplus concrete recovery tool 10 can be reused immediately.

As described above, in the best mode 1, the surplus concrete collecting tool 10 is collected by the annular plate member in which the tremmy hole 11a is formed at the center and the radial slits 13 are formed around the tremmy hole 11a. Since it comprises the tool main body 11 and the circumferential rib 12 provided at the peripheral edge of the recovery tool main body 11, the peripheral edge of the recovery tool main body 11 is reinforced by the circumferential rib 12, so that the surplus concrete is recovered. The strength of the tool 10 can be sufficiently secured. Therefore, even when the surplus concrete recovery tool 10 is lifted and the semi-cured surplus concrete D that has entered the upper part of the recovery tool main body 11 from the slit 13 and collected is recovered, Since the collection tool main body 11 is not deformed by the weight, the collection tool can be reused without being repaired.
Further, since the surplus concrete recovery tool 10 of this example has a simple configuration comprising the recovery tool body 11 and the circumferential rib 12, the surplus concrete recovery tool which is an assembly of the conventional hollow pipes shown in FIG. It is smaller and lighter than 40. Therefore, it has the advantage that it is not only easy to produce but also easy to transport.
Further, a lid member 15 made of an elastic member such as natural rubber or synthetic rubber is attached to the peripheral portion of the tremey hole 11a, and a release material 16 made of foamed resin such as an air cushion material is attached to the back side of the recovery tool body 11. Therefore, the surplus concrete collecting tool 10 can be easily separated from the pile concrete placed in the lower part of the collecting tool main body 11. Therefore, the surplus concrete collecting tool 10 can be easily pulled up.

In the best mode 1 described above, the circumferential rib 12 is provided to reinforce the recovery tool body 11, but as shown in FIGS. 5 (a) and 5 (b), in addition to the circumferential rib 12, If a plurality of radial ribs 18 extending in the radial direction of the recovery tool main body 11 are provided, the strength of the surplus concrete recovery tool 10 can be further increased. Specifically, the radial rib 18 is a plate-like member standing on the upper surface side of the collection tool main body 11, and one end is connected to the radially inner end of the circumferential rib 12, and the other Ends at the edge of the tremmy hole 11a. Further, the height is a trapezoidal shape as viewed from the side, which is low on the circumferential rib 12 side and high on the tremey hole 11a side.
As the arrangement of the radial ribs 18, it is preferable to arrange a plurality of points symmetrically with respect to the tremey hole 11 a, whereby the collection tool main body 11 can be reinforced uniformly.
Further, as shown in FIGS. 5A and 5B, a support tube 19 for introducing the tremy tube 50 is provided at the edge of the tremey hole 11a, and the radial rib 18 is provided on the support tube 19. If the one end portion is fixed, the recovery tool main body 11 can be further reinforced, so that the strength of the surplus concrete recovery tool 10 can be further improved. Needless to say, the inner diameter of the hollow portion of the support tube 19 is larger than the outer diameter of the tremy tube 50, and the hollow portion of the support tube 19 is concentrically installed with the treme hole 11a. . By installing the support tube 19, in addition to the effect of the reinforcement, an effect that the tremy tube 50 can be easily introduced is obtained as compared with the case where only the tremey hole 11 a is provided.

Further, in the above example, the above-described extra-concrete concrete collecting tool 10 is manufactured as a single unit. However, the collecting tool 10 is composed of a plurality of pieces 10P as shown in FIG. 6A, and these pieces 10P are connected. It is good also as a structure connected with the member 11m. The piece 10P has a planar fan-shaped plate member 11P in which a plurality of slits 13 and a plurality of through holes 14 for penetrating the main bars 32 of the reinforcing bar 31 are formed, and an edge of an arc portion on the radially outer side thereof Are provided with fan-shaped ribs 12P. Further, an arc-shaped cutout portion 11k is provided on the inner side in the radial direction, and a bolt mounting hole 11n for mounting the connecting member 11m is provided on the ridge line portion 11v side which is a split surface (or connection surface). Is provided.
When such pieces 10P are arranged in an annular shape in the circumferential direction (the direction of the arc) and adjacent pieces 10P are connected by a connecting member 11m and a fastening member such as a bolt 11d, as shown in FIG. Since the connected notch 11k constitutes the tremey hole 11a, the surplus concrete recovery tool 10R having the same configuration as the surplus concrete recovery tool 10 can be obtained.
Moreover, as shown to Fig.7 (a), you may erect the plate-shaped reinforcement member 18P of the structure similar to the said radial direction rib 18 on each ridgeline part 11v side of the said piece 10P. In this case, as shown in FIG. 7 (b), the reinforcing members 18P of the adjacent pieces 10P are connected to each other with bolts 11d, and at the edge of the tremmy hole 11a formed by arranging the notches 11k, If the support tube 19 for introducing 50 is arranged, the surplus concrete collecting tool reinforced also in the radial direction similar to FIGS. 5A and 5B can be obtained. In addition, as a method of connecting the reinforcing members 18P of the adjacent pieces 10P, a U-shaped connecting member is prepared, and the reinforcing members 18P and 18P of the adjacent piece 10P are fitted together and joined together. Other methods may be used.

Best mode 2.
In the best mode 1 described above, the surplus concrete collecting tool 10 attached to the tip of the reinforcing bar 31 formed in a cylindrical shape by combining the linear main bar 32 and the annular hoop bar 33 has been described. 8A and 8B, when a plurality of core rebars attached to the upper structure or its foundation are attached with the tip side protruding upward from the rebar main body. If the surplus concrete recovery tool 20 provided with the inner recovery tool 20A installed inside the core rebar 34 and the outer recovery tool 20B installed outside the core rebar 34 is used, the surplus concrete can be efficiently used. It can be recovered and removed.
The inner recovery tool 20A is for removing the above-described extra-concrete when the extra-concrete deposited on the inner side of the core rebar 34 is in a semi-hardened state. An annular collection tool body 21A having a plurality of slits 23 formed therein, a circumferential rib 22A provided on the peripheral edge of the collection tool body 21A, and a plurality of collection tool bodies arranged radially around the tremey hole 21a A radial rib 28 extending in the radial direction of 21A, a lid member 25 attached so as to close the tremey hole 21a, a release material 26A attached to the back side of the recovery tool body 11, and the tremey hole 21a The support tube 29 is provided for passing the tremy tube 50, which is installed at the peripheral portion of the tube.
On the other hand, the outer collection tool 20B includes an annular collection tool body 21B having an inner diameter smaller than the outer diameter of the collection tool body 21A of the inner collection tool 20A and an outer diameter set to a size including the main muscle 32. . A circumferential rib 22B similar to the circumferential rib 22A is provided upright on the outer edge of the recovery tool main body 21B. The recovery tool main body 21B is formed with a through hole 24B for penetrating the main reinforcing bar 32, a through hole 24C for penetrating the core rebar 34, and a plurality of slits 23B. A release material 26B is attached to the.
As shown in FIG. 8B, the outer collection tool 20B is installed on the lower side of the inner collection tool 20A, that is, on the side of the drilling hole 30.
The slits 23A and 23B, the lid member 25, the release materials 26A and 26B and the like have the same configuration and function as the slit 13, the lid member 15, the release material 16 and the like of the best mode 1, and therefore will be described. Omitted.

The core reinforcing bar 34 is a reinforcing bar fixed to the upper structure or its foundation, and protrudes upward from the reinforcing bar rod 31, so that the surplus concrete also adheres around the core reinforcing bar 34. Therefore, even if the surplus concrete is in a semi-hardened state, a large pulling force is required to lift and collect the surplus concrete all at once. In this example, the outer collection tool 20 </ b> B is installed in a region including the core rebar 34, the inner collection tool 20 </ b> A having the above-described configuration is installed inside the core rebar 34, and the surplus deposited on the inner side of the core rebar 34. Concrete is collected in a semi-cured state. At this time, the inner collection tool 20A is installed such that its outer peripheral portion overlaps with the inner peripheral portion of the outer collection tool 20B.
In this example, surplus concrete that has entered the upper side of the recovery tool main body 21A from the slit 23A of the inner recovery tool 20A and is deposited inside the core rebar 34 is recovered in a semi-cured state, and the outer recovery tool is collected. The excess concrete that has entered the upper part of the recovery tool main body 21B from the slit 23B of 20B and is deposited around and around the core rebar 34 is removed after the recovery of the inner recovery tool 20A. Yes.
That is, if the surplus concrete deposited inside the core rebar 34 is collected first, the surplus concrete around the core rebar 34 can be easily removed. After the recovery, the extra concrete around the core rebar 34 is removed, and then the outer collection tool 20B is lifted to collect the remaining extra concrete. Can be efficiently recovered and removed.
Note that the inner collection tool 20A may also be configured by connecting pieces obtained by dividing the inner collection tool 20A into a plurality in the circumferential direction, as in the best mode 1.

  As described above, according to the present invention, the semi-hardened surplus concrete can be easily removed and the concrete recovery tool can be reused. Can be done well.

It is a figure which shows the structure of the surplus concrete collection | recovery tool concerning the best form 1 of this invention. It is a figure which shows the structure of the cover member used for the surplus concrete collection tool of this invention. It is a figure for demonstrating the assembly method of a surplus concrete collection tool. It is a figure which shows the removal method of surplus concrete. It is a figure which shows the other structure of the surplus concrete collection tool by this invention. It is a figure which shows the other structure of the surplus concrete collection tool by this invention. It is a figure which shows the other structure of the surplus concrete collection tool by this invention. It is a figure which shows the structure of the surplus concrete collection tool concerning this best form 2. FIG. It is a figure which shows the structure of the conventional surplus concrete collection tool. It is a figure which shows the other structure of the conventional surplus concrete collection tool.

Explanation of symbols

10 surplus concrete recovery tool, 11 recovery tool body, 11a treme hole,
12 circumferential ribs, 13 slits, 14 through holes, 15 lid members, 16 release materials,
18 radial ribs, 19 support tubes,
30 drilling holes, 31 rebar rods, 32 main bars, 33 hoop bars, 50 tremy tubes.

Claims (5)

  It is a recovery tool for recovering surplus concrete before hardening, which is attached to the tip of a reinforcing bar built in a drilled hole to construct a cast-in-place concrete pile, and introduces a tremy pipe An annular member in which an introduction hole and a plurality of slits are formed, and a circumferential rib provided on the peripheral portion of the annular member and protruding toward the upper side of the annular member, Extra concrete collection tool to be used.   2. The surplus concrete according to claim 1, wherein, in addition to the circumferential rib, a radial rib is provided that protrudes toward an upper side of the annular member and extends in a radial direction of the annular member. Collection tool.   The surplus concrete collecting tool according to claim 1 or 2, further comprising a support pipe having a hollow portion into which the tremy pipe is introduced.   The extra-concrete recovery tool according to claim 1, wherein the annular member is formed by connecting pieces obtained by dividing the annular member into a plurality of pieces in the circumferential direction.   On the split surface side that becomes the connecting portion of the piece, radial ribs that protrude from the upper side of the piece and extend along the split surface are erected, and the radial ribs of the adjacent pieces are adjacent to each other. These are connected, The surplus concrete collection tool of Claim 4 characterized by the above-mentioned.

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