JP2017145642A - Cushioning tongue piece and concrete transfer pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete transfer pipe excellent in the material separation restraining effect of concrete, and not blocking up the transfer pipe inside by the transferred concrete, and a cushioning tongue piece applied to this concrete transfer pipe.SOLUTION: In a concrete transfer pipe 100 constituted of a pipe body 30 having a hollow part 30a of a circular cross section, and in a cushioning tongue piece 10 having elasticity installed in the pipe body 30, the cushioning tongue piece 10 is constituted of a central tongue piece 1 and a plurality of side tongue pieces 2, 3, 4 and 5 arranged around the central tongue piece 1, and the central tongue piece 1 extends over both ends of a diameter D of the circular cross section, and one end of the central tongue piece 1 is fixed to one end of the diameter D, and the other end of the central tongue piece 1 is not fixed to the other end of the diameter D, and the plurality of side tongue pieces 2, 3, 4 and 5 are fixed at these one ends on the contour of the circular cross section, and these other ends are not fixed to the contour of the circular cross section or the central tongue piece 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete transfer pipe applied when transferring concrete from a concrete supply source such as a concrete pump truck to a concrete placement site, and a buffering tongue piece applied to the concrete transfer pipe.

  A long drop when transporting concrete from a concrete supply source such as a concrete pump car to the actual concrete placement position in the construction of large concrete structures such as various infrastructure facilities such as underground tanks and shaft foundations and skyscrapers There are many cases where concrete is dropped and transported in the vertical direction.

  The falling speed of the concrete increases as the falling distance becomes longer, and the concrete collides with the inner wall of the transfer pipe and the placement place at a high speed.

  Thus, there is a problem that the concrete is separated into coarse aggregate and mortar (a mixture of cement, water, and fine aggregate) when the concrete collides with the placement place or the like at a high speed.

  With respect to such a problem, in Patent Document 1, a plurality of hollow transport pipes in which a transported material is dropped and supplied vertically collide with all the transported materials that are provided in the middle of the vertical portion of each transport pipe and fall. And repeatedly connecting the transport pipes so as to communicate with each other by overlapping each other along the vertical direction and overlapping each other. A continuous vertical transfer device is disclosed.

  According to this vertical transfer device, it is possible to reduce the fall height of the transferred material such as concrete, and there is no possibility of damaging the vertical transfer device itself and accessories such as the mixing device. However, since the falling concrete collides with the fallen object reservoir, it is difficult to say that the above-described effect of suppressing the material separation of the concrete is high.

  On the other hand, in Patent Document 2, a plurality of tongue pieces made of an elastic member extending from the wall surface of the concrete conveyance pipe toward the center of the conveyance pipe are arranged along one inner cross section of the conveyance pipe along the inner periphery of the conveyance pipe. A concrete separation preventing jig configured to be disposed on top is disclosed. More specifically, the tongue piece is formed in a sector shape surrounded by an arc formed by dividing the circumference into eight parts and the radius of the circle, and the end face of the cylindrical connecting part is formed with the arc as a fixed end and the radius as a free end. It arrange | positions along the inner periphery of a connection part so that it may form, and it has the structure attached to the pipe joint of a concrete conveyance pipe line by a tongue piece and a connection part.

  According to this concrete separation preventing jig, it is possible to prevent the separation of concrete in a vertical placement with a large drop with a simple configuration. Certainly, since the falling speed of the concrete is reduced by the elastic member, the material separation of the concrete can be suppressed. However, since the inside of the transport pipe is closed by a plurality of tongue pieces having an arc as a fixed end and a radius as a free end, the hollow cross section of the transport pipe at the tip of each tongue piece (end on the center side of the transport pipe) As a result, the concrete falling continuously tends to stay in the center of the narrowed hollow section. Further, the biting between the coarse aggregates of the retained concrete and the so-called arch action impedes the fall of the subsequent concrete. Is concerned.

  When the above-mentioned problem is verified in more detail, in each tongue piece constituting the concrete separation preventing jig, the center part where a lot of concrete falls is shaped to be more easily deformed than other parts. It is necessary to set the rigidity of the piece high. Therefore, when the rigidity of the tongue piece is increased, the deformation of the outer peripheral portion will be further suppressed compared to the central portion, and as a result, the dropping hole in the central portion is narrowed, and the concrete is difficult to fall, Concrete is piled up by the above-mentioned biting of coarse aggregates and arch action, and the hollow section is closed.

JP 2009-40582 A JP 2001-115647 A

  The present invention has been made in view of the above problems, and is applied to a concrete transfer pipe excellent in the effect of suppressing material separation of concrete and not clogging the inside of the transfer pipe by the transferred concrete and the concrete transfer pipe. The object is to provide a cushioning tongue.

  In order to achieve the above object, a buffering tongue piece according to the present invention is a buffering tongue piece having elasticity which is attached to the pipe body in a concrete transfer pipe composed of a pipe body having a hollow with a circular cross section. The buffering tongue is composed of a central tongue and a plurality of side tongues disposed around the central tongue, and the central tongue extends across both ends of the diameter of the circular cross section. One end of the central tongue is a fixed end fixed to one end of the diameter, and the other end of the central tongue is a free end not fixed to the other end of the diameter, In the side tongue piece, one end of the side tongue piece is a fixed end fixed on the outline of the circular cross section, and the other end of the side tongue piece is on the outline of the circular cross section or the central tongue piece. It is a free end that is not fixed.

  The buffering tongue of the present invention is a tongue applied to a concrete transfer pipe having a hollow with a circular cross section, and a central tongue extending along both ends of the diameter along the diameter of the circular cross section, and the central tongue It is characterized in that it is composed of a plurality of side tongue pieces arranged around the piece.

  Both the central tongue piece and the side tongue piece are formed of rubber or the like which is an elastic material. The central tongue is a fixed end whose one end is fixed to one end of the diameter, and the other end is a free end that is not fixed to the other end of the diameter. Then, both ends of the central tongue piece have an arc shape, and the shape thereof is a substantially rectangular shape having a length of diameter.

  On the other hand, there are two forms shown below as forms of the plurality of side tongue pieces.

  One form of the plurality of side tongue pieces is a fixed end in which one end of the side tongue piece is fixed on the outline of the circular cross section, and the other end of the side tongue piece is fixed to the outline of the circular cross section. It is a form that is not a free end. More specifically, one end (fixed end) of each side tongue piece has an arc shape, and the shape thereof is substantially triangular. For example, the lateral tongue piece adjacent to the central tongue piece has the largest size, and the size of the substantially triangular side tongue piece decreases as the distance from the central tongue piece increases.

  The other end (free end) of each side tongue piece is on the free end side of the center tongue piece, and the entire area of the circular cross section is closed by the center tongue piece and the plurality of side tongue pieces. Also, the central tongue piece and the plurality of side tongue pieces are separated from each other. Therefore, the central tongue piece and the side tongue pieces are deformed so that the free end side is curved with the fixed ends aligned with each other as a fulcrum. become.

  In the lateral tongue piece of this embodiment, since the free end of each lateral tongue piece is on the same side as the free end of the central tongue piece, the transfer formed when the central tongue piece and the side tongue piece are curved. The object drop hole is formed at a position offset from the center of the circular cross section toward the free end. Therefore, the continuously falling concrete (transferred material) does not stay in the center of the narrowed hollow section, and the concrete does not block the hollow section.

  Another form of the plurality of side tongue pieces is a fixed end in which one end of the side tongue piece is fixed on the contour of the circular cross section, and the other end of the side tongue piece is fixed to the central tongue piece. This is a form that is not a free end. More specifically, one end (fixed end) of each side tongue piece has an arc shape, and the shape thereof is substantially triangular or substantially rectangular.

  Since the free end of each side tongue is in contact with the side of the center tongue, the center tongue is curved at the free end that touches the circular cross section, while the side tongues are free on the side of the center tongue The edge is curved. Therefore, the fall hole of the transfer object formed by curving the central tongue and the side tongues includes a region on the free end side of the center tongue and a region on the free end side of the plurality of side tongues (center tongue). One side area). Therefore, similarly to the side tongue piece in the form described above, the problem that the transferred material stays at the center of the hollow cross section cannot occur.

  In addition, since there is a central tongue piece extending in the diameter direction of the circular cross section at the center of the circular cross section, the concrete dropped to the central position of the circular cross section collides with the central tongue piece existing at the central position of the buffering tongue piece. Thus, an excellent buffering effect can be expected due to the elasticity of the central tongue.

  Further, in another embodiment of the buffer tongue according to the present invention, at least the thickness of the central tongue is the thickest at the fixed end fixed to the contour of the circular section, and is not fixed to the contour of the circular section. The thickness gradually decreases to the position of about 1/3 of the diameter toward the free end in contact with the state, and the thickness is constant over the remaining 2/3 of the diameter. In addition, “at least the thickness of the central tongue piece” means that the thickness of the side tongue piece is set to the same thickness as that of the central tongue piece in addition to the above-described setting of only the thickness of the central tongue piece. It means you can do it.

  The central tongue has a circular cross-sectional diameter, is longer than the side tongue, is fixed to the tube body only at one fixed end, and the central tongue is an elastic material Thus, by increasing the thickness of the central tongue piece on the fixed end side as compared with other parts, the returnability after the central tongue piece is curved becomes better, and the durability of the central tongue piece is increased. Further, even in the buffering tongue piece of this form, since the central tongue piece exists in the center of the circular cross section, an excellent buffering effect can be expected due to the elasticity of the central tongue piece. On the other hand, the deformation performance of the central tongue varies greatly depending on the extent of the thick fixed end region.

  According to the present inventors, the fixed end of the central tongue piece is the thickest, and the thickness gradually decreases to a length position of about 1/3 of the diameter toward the free end, and the remaining length of about 2/3 of the diameter. It has been found that by applying a proportion that has a constant wall thickness, excellent deformability can be assured along with good returnability and durability of the central tongue. In addition, this is an effect which can be enjoyed even when the thickness of the central tongue piece described above is set for the side tongue piece.

  As for the relationship between the thickness of the fixed end and the thickness of the free end, the thickness of the fixed end is preferably set in a range of about 1.5 to 2.0 times the thickness of the free end.

  The thicker the fixed end (support) of the buffering tongue, the better the returnability and durability of the buffering tongue, and the superior deformation performance can be guaranteed. Since it becomes large, the fall hole of a transferred material tends to become narrow, and the blockage of the transferred material can easily occur. According to the present inventors, it is estimated that the appropriate range of the thickness of the fixed end is 1.5 times to 2 times the thickness of the free end. It depends on the estimation.

  In addition, the buffering tongue piece may include an engaging portion that protrudes outward from the tube main body at an outer peripheral end thereof.

  In addition, a concrete transfer pipe according to the present invention includes a plurality of pipe main bodies having a circular cross-section hollow, and a buffering tongue piece having the engagement portion attached to a joint position of the plurality of pipe main bodies. The buffer tongue is sandwiched between the end surfaces of the two tube main bodies at the joint position, and the engaging portion is engaged across the outer peripheral surfaces of the two tube main bodies, Two or more buffering tongues are arranged at intervals in the concrete transfer direction, and the fixed ends of the central tongues of the buffering tongues are arranged in order in the concrete transfer direction. They are alternately arranged so as to be on the opposite side of the tube body.

  For example, rubber buffering tongues are sandwiched between the end surfaces of two tube bodies, the tube bodies are fixed to each other, and the buffering tongues are attached so that the buffering tongues are secured to the tube body while ensuring water-stopping properties. Can be firmly fixed. In addition, since the buffer tongue piece is applied between the end surfaces of the two tube main bodies, the attachment and detachment of the buffer tongue piece is extremely easy.

  In addition, two or more buffering tongues are arranged at intervals in the concrete transfer direction with respect to the pipe body, and the fixed ends of the central tongues of each buffering tongue piece are sequentially arranged in the concrete transfer direction. By alternately arranging so as to be opposite to each other, the concrete falling path can be meandered. Thus, the concrete fall path meanders, and thus the apparent fall height per unit time is lowered, and the fall speed can be suppressed.

  Note that, “the fixed ends of the central tongues of the respective buffer tongues are alternately arranged so that they are sequentially opposite to the pipe body in the concrete transfer direction”, for example, is arbitrarily set in the pipe body This means that the fixed end of each central tongue piece is alternately arranged at one end and the other end of the diameter.

  As can be understood from the above description, according to the buffering tongue piece of the present invention and the concrete transfer pipe provided with the same, the buffering tongue piece extends along the diameter of the circular cross section across both ends of the diameter. Consists of a tongue piece and a plurality of side tongue pieces arranged around the central tongue piece, preventing concrete material separation from staying in the concrete transfer pipe. However, good transport of concrete can be realized.

It is a top view of Embodiment 1 of the buffering tongue piece of this invention, Comprising: It is the II arrow directional view of FIG. It is the II-II arrow line view of FIG. 1, Comprising: It is the figure which showed together the concrete transfer pipe. It is the schematic diagram explaining embodiment of the concrete transfer pipe of this invention. It is a top view of Embodiment 2 of the buffering tongue piece of this invention.

  Hereinafter, with reference to drawings, Embodiment 1 and 2 of the tongue piece for buffering of this invention and Embodiment of a concrete transfer pipe are described.

(Embodiment 1 of buffer tongue and embodiment of concrete transfer pipe)
FIG. 1 is a plan view of Embodiment 1 of the buffering tongue piece according to the present invention, which is a view taken along arrow II in FIG. 2, and FIG. 2 is a view taken along arrow II-II in FIG. It is the figure which showed the concrete transfer pipe together. FIG. 3 is a schematic view illustrating an embodiment of the concrete transfer pipe of the present invention.

  The buffering tongue piece 10 shown in the figure is attached to a pipe body 30 having a circular cross-section hollow 30 a constituting the concrete transfer pipe 100, and is disposed around the central tongue piece 1 and the central tongue piece 1. And a plurality of side tongue pieces 2, 3, 4 and 5. In addition, the dotted line in FIG. 1 has shown the boundary line from which the thickness which decreases gradually mentioned later becomes constant thickness.

  The central tongue piece 1 and the side tongue pieces 2, 3, 4 and 5 are all made of rubber or the like, which is an elastic material.

  In FIG. 1, one end of the central tongue 1 is fixed to one end of the diameter D (fixed end 1a), and the other end is not fixed to the other end of the diameter D (free end 1b).

  Both ends of the central tongue piece 1 have an arc shape, and the shape thereof is a substantially rectangular shape with a central line having a length d of a diameter D. On the other hand, each of the plurality of side tongue pieces 2, 3, 4 and 5 has one end fixed on the contour of the circular cross section (fixed ends 2a, 3a, 4a and 5a), and the other end formed on the contour of the circular cross section. It is not fixed to the free ends (free ends 2b, 3b, 4b).

  The fixed end of each side tongue piece has an arc shape, and its shape is substantially triangular. Note that the side tongue piece 5 does not have a triangular shape, has a small planar dimension and has a free end, but hardly deforms.

  The lateral tongue pieces 2, 3, 4 having a substantially triangular shape have the largest size of the side tongue piece 2 adjacent to the central tongue piece 1, and the size decreases as the distance from the central tongue piece 1 increases.

  The free ends 2b, 3b, 4b of the side tongue pieces 2, 3, 4 are on the free end 1b side of the central tongue piece 1 (coincident with the free end 1b), and the central tongue piece 1 The side tongue pieces 2, 3, 4 and 5 close almost the entire circular cross section. That is, since the free end 1b of the central tongue piece 1 and the free ends 2b, 3b, 4b of the side tongue pieces 2, 3 and 4 hang down due to their own weights, the sagging region is not closed. "The entire area is blocked."

  Further, the central tongue piece 1 and the plurality of side tongue pieces 2, 3, 4 and 5 are all separated, and the central tongue piece 1 and the side tongue pieces 2, 3, 4 are fixed to each other at the fixed ends 1a, The free ends 1b, 2b, 3b, 4b are deformed so as to hang downward with 2a, 3a, 4a as fulcrums.

  Taking the central tongue piece 1 as an example, as shown in FIG. 2, the free end 1b side is deformed so as to hang downward (X direction) with respect to the weight P of the concrete falling freely from above (in the X direction). Through the drop hole formed in this manner, the concrete whose dropping speed has been reduced by the buffering tongue piece 10 falls downward.

  Further, the thickness of the central tongue 1 is the thickest at the fixed end 1a fixed to the contour of the circular cross section, and is about 1/3 of the diameter toward the free end 1b that is in non-fixed contact with the contour of the circular cross section. The wall thickness gradually decreases to a position of about length d / 3, and the wall thickness is constant over the remaining length of about 2d / 3 of the diameter.

  Also in the side tongue pieces 2, 3 and 4, their fixed ends 2a, 3a and 4a are the thickest as in the case of the central tongue piece 1 up to their midpoints toward their free ends 2b, 3b and 4b. The wall thickness gradually decreases, and the wall thickness is constant over the remaining length range.

  Further, regarding the relationship between the thickness t1 of the fixed ends 1a, 2a, 3a, 4a and the thickness t2 of the free ends 1b, 2b, 3b, 4b, the thickness t1 of the fixed ends 1a, 2a, 3a, 4a is the free end. It is set to a range of about 1.5 to 2 times the wall thickness t2 of 1b, 2b, 3b, and 4b.

  Taking the central tongue 1 as an example, when the thickness t2 of the free end 1b is 5 mm, the thickness t1 is 10 mm when the thickness t1 of the fixed end 1a is twice the thickness t2. At the fixed end 1a of the central tongue piece 1, the central tongue piece 1 cannot be bent with a bending radius smaller than its thickness. Accordingly, at least 20 mm of unevenness occurs at the fixed end 1a. This 20 mm unevenness is the maximum size of general concrete coarse aggregate, and an unevenness exceeding this can cause material separation. From this, the thickness t1 of the fixed end 1a is defined to be not more than twice the thickness t2 of the free end 1b.

On the other hand, at the fixed end 1a of the central tongue 1, the central tongue 1 cannot be bent with a bending radius smaller than its wall thickness t1. In view of the fact that the durability increases as the thickness increases, the bending rigidity at the fixed end 1a, which is a function of the thickness, is used as an index. When the wall thickness t1 of the fixed end 1a is 1.5 times, the bending rigidity at that position is 1.5 ³ = 3.375 times. When the concrete placement amount that the tongue piece can withstand when the wall thickness t1 is 1 times 36 m ³ obtained at the trial placement, 36 m ³ × 3.375 to this concrete placement amount = 121.5 m ³ , and the amount of concrete to be cast can be increased to 120 m ³ . When the ratio of the wall thickness is 1.4 times, the flexural rigidity is 1.4 ³ = 2.744 times, and in this case, 36 m ³ × 2.744 = 98.784 m ³ , the continuous casting amount of concrete is 120 as described above. It becomes much less with respect to m ^3. From this, the thickness of the fixed end 1a is defined to be 1.5 times or more the thickness of the free end 1b.

  Since the free ends 2b, 3b, 4b of the side tongue pieces 2, 3, 4 are not fixed to the side surface of the central tongue piece 1, the free end 1b side of the central tongue piece 1 contacting the circular cross section hangs downward. On the other hand, the plurality of side tongue pieces 2, 3 and 4 are deformed so that the free ends 2b, 3b and 4b on the free end 1b side of the central tongue piece 1 hang down. Accordingly, the concrete dropping hole formed by deforming the central tongue piece 1 and the side tongue pieces 2, 3, 4 is composed of a region on the fixed end 1 a side of the central tongue piece 1 and a plurality of side tongue pieces 2. The region A1 in FIG. 1 is formed by the regions on the fixed ends 2a, 3a, and 4a side of 3 and 4, and is a region offset laterally from the center position O of the circular section.

  Therefore, the problem that the continuously falling concrete (transferred material) tends to stay at the center of the narrowed hollow section cannot occur. Further, in the cushioning tongue piece 10, since the central tongue piece 1 extending in the diameter direction of the circular cross section exists at the center of the circular cross section, the concrete dropped to the central position of the circular cross section is located at the central position of the buffer tongue piece 10. It will collide with the center tongue piece 1 which exists in this, and the buffer effect excellent in the elasticity of the center tongue piece 1 can be anticipated.

  Further, the central tongue piece 1 and the side tongue pieces 2, 3 and 4 are fixed to the tube main body 30 only at one of the fixed ends 1a, 2a, 3a and 4a. Since the tongue pieces 2, 3 and 4 are made of an elastic material, the thickness of the central tongue piece 1 and the fixed ends 1a, 2a, 3a and 4a of the side tongue pieces 2, 3 and 4 is compared with other parts. By increasing the thickness, the returnability after the central tongue piece 1 and the side tongue pieces 2, 3, 4 are curved is improved, and the durability of the central tongue piece 1 and the side tongue pieces 2, 3, 4 is improved. Will increase.

  As shown in FIGS. 2 and 3, the concrete transfer pipe 100 includes a plurality of pipe main bodies 30 having a hollow 30 a having a circular cross section, and a buffering tongue piece 10 attached to a joint position of the plurality of pipe main bodies 30. , Is composed of. More specifically, as shown in FIG. 3, two or more buffering tongues 10 are disposed at intervals in the concrete transfer direction with respect to the pipe body 30, and each buffering tongue 10 has a center. The fixed ends 1a of the tongue pieces 1 are alternately arranged so as to be sequentially opposite to the pipe body 30 in the concrete transfer direction. In addition, the concrete transfer pipe 100 can be configured such that about five pipe bodies 30 having a length of about 200 mm are stacked in the concrete transfer direction, and the buffer tongues 10 are disposed at the respective joint positions.

  The buffering tongue piece 10 includes an engaging portion 10a that protrudes outward from the tube body 30 at the outer peripheral end thereof.

  The engaging portion 10a is continuous with the central tongue piece 1 and the side tongue pieces 2, 3, and 4. The buffer tongue piece 10 is sandwiched between the two pipe main bodies 30 at the joint position, and the engaging portion 10a is connected to these two pieces. The two pipe bodies 30 are engaged across the outer peripheral surface. Further, the engaging portion 10a is fastened by a joint 20 disposed on the outer periphery thereof, whereby an engaging structure for two pipe main bodies 30 is formed.

  The rubber cushioning tongue piece 10 is sandwiched between the end surfaces of the two tube main bodies 30, the tube main bodies 30 are fixed to each other, and the buffer tongue piece 10 is attached. The buffer tongue 10 can be firmly fixed to the tube main body 30 while securing the above.

  As shown in FIG. 3, two or more buffering tongues 10 are arranged at intervals in the concrete transfer direction with respect to the pipe body 30, and the central tongues 1 of the respective buffering tongues 10 are provided. Since the fixed ends 1a are alternately arranged so as to be sequentially opposite to the pipe body 30 in the concrete transfer direction, the concrete falling path can be meandered. Thus, the concrete fall path meanders, and thus the apparent fall height per unit time is lowered, and the fall speed can be suppressed.

(Embodiment 2 of buffer tongue piece)
FIG. 4 is a plan view of a buffer tongue piece according to a second embodiment of the present invention. The buffer tongue piece 10A shown in the figure is fixed to one end of the diameter D (fixed end 1a) and the other end is not fixed to the other end of the diameter D, like the buffer tongue piece 10. Although it has the piece 1, the shape of the side tongue piece is different from that of the buffer tongue piece 10.

  In the cushioning tongue 10A, one end of each side tongue piece 6, 7, 8 is fixed on the contour of the circular cross section (fixed end 6a, 7a, 8a), and the other end of the side tongue piece 6, 7, 8 is It is not fixed to the central tongue 1 (free ends 6b, 7b, 8b).

  The fixed ends 6a, 7a, 8a of the side tongue pieces 6, 7, 8 have an arc shape, and the shape of the side tongue piece 6 located in the center is rectangular, and the side tongue pieces on the left and right sides thereof are rectangular. The shapes of 7 and 8 are substantially triangular. Since the free ends 6b, 7b, 8b of the side tongue pieces 6, 7, 8 are in contact with the side surface of the central tongue piece 1, the central tongue piece 1 is hung downward on the free end 1b side in contact with the circular cross section. On the other hand, the side tongue pieces 6, 7, 8 are deformed so that the free ends 6b, 7b, 8b on the central tongue piece 1 hang downward. Therefore, the fall hole of the transported object formed by deforming the central tongue piece 1 and the side tongue pieces 6, 7, 8 has a region on the fixed end 1 a side of the central tongue piece 1 and a plurality of side tongue pieces 6. , 7 and 8 are regions A2 in FIG.

  Even with the cushioning tongue 10A, the problem that the continuously falling concrete (transferred material) tends to stay at the center of the hollow section in which the concrete has been squeezed cannot occur.

  In addition, also in the buffer tongue piece 10A, the wall thickness on the fixed end side of the central tongue piece 1 and the side tongue pieces 6, 7, and 8 is thick, and thus the above-described effect can be enjoyed. .

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Central tongue piece, 1a ... Fixed end, 1b ... Free end, 2, 3, 4, 5, 6, 7, 8 ... Side tongue piece, 2a, 3a, 4a, 5a, 6a, 7a, 8a ... Fixed End, 2b, 3b, 4b, 6b, 7b, 8b ... Free end, 10, 10A ... Buffering tongue, 10a ... Engagement part, 20 ... Joint, 30 ... Pipe body, 30a ... Hollow, 100 ... Concrete transfer pipe

Claims (5)

In a concrete transfer pipe composed of a pipe body provided with a hollow of a circular cross section, a cushioning tongue having elasticity attached to the pipe body,
The buffering tongue piece is composed of a central tongue piece and a plurality of side tongue pieces arranged around the central tongue piece,
The central tongue piece extends over both ends of the diameter of the circular cross section, one end of the central tongue piece is a fixed end fixed to one end of the diameter, and the other end of the central tongue piece is the other end of the diameter Is a free end that is not fixed against
In the plurality of side tongue pieces, one end of the side tongue piece is a fixed end fixed on the outline of the circular cross section, and the other end of the side tongue piece is the outline of the circular cross section or the central tongue. A cushioning tongue that is a free end that is not fixed to the strip.   At least, the thickness of the central tongue is the thickest at the fixed end, and the thickness gradually decreases to the position of 1/3 of the diameter toward the free end, and the remaining 2/3 length of the diameter. The shock-absorbing tongue piece according to claim 1, wherein the thickness is constant over a wide range.   The buffering tongue piece according to claim 2, wherein the thickness of the fixed end is in the range of 1.5 to 2.0 times the thickness of the free end.   The buffering tongue piece according to any one of claims 1 to 3, wherein the buffering tongue piece includes an engaging portion that projects outward from the tube main body. A plurality of tube bodies with a circular cross-section hollow;
The cushioning tongue piece according to claim 4, which is attached to a joint position of the plurality of pipe main bodies,
The buffer tongue is sandwiched between the end surfaces of the two tube main bodies at the joint position, and the engaging portion is engaged across the outer peripheral surfaces of the two tube main bodies,
Two or more buffering tongues are arranged at intervals in the concrete transfer direction with respect to the pipe body;
A concrete transfer pipe in which the fixed ends of the central tongue pieces of the buffering tongue pieces are alternately arranged so as to be sequentially opposite to the pipe body in the concrete transfer direction.

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