JP6570973B2 - Tremy tube - Google Patents

Description

  The present invention relates to a structure of a tremy tube for placing filled concrete in pile foundations.

  A pile foundation is a type of foundation that supports the load of a structure and transmits it to the ground. The main method of pile foundation is the ready-made pile construction method in which steel pipe piles and other ready-made piles are driven into the ground, and concrete piles are placed by placing concrete for filling in the holes (drilling holes) created by excavating the ground. There is a cast-in-place pile method. When the pile used for the ready-made pile construction method is a pipe pile such as a steel pipe pile, in order to increase the strength of the pipe pile, concrete for filling is often placed in the pile.

  As a method of placing concrete in the pipe pile in the ready-made pile method using pipe piles, or placing concrete in the excavation hole in the cast-in-place pile method, Tremy pipe, which is a pipe for pumping concrete A treme system is widely used in which concrete is inserted into a pipe pile or an excavation hole, and concrete is placed in the pipe pile or the excavation hole from an opening provided near the tip of the tremy pipe. In addition, in this application, the front-end | tip part of a tremy tube (or the main body of a tremmy tube) means a lower edge part.

  As a patent document disclosing an invention related to the structure of a tremy tube, for example, there is Patent Document 1. The length of the tremy pipe is usually about several meters. When the depth of the pipe pile or the excavation hole is deeper than the length of the tremy pipe, a combination of two or more tremy pipes is used. Patent Document 1 discloses a connection structure and an attachment / detachment method for improving the efficiency of connecting and separating tremy tubes.

JP 2003-027481 A

  In the construction of pile foundations, when concrete is placed in a pipe pile (in the case of a ready-made pile method using a pipe pile) or in a drilling hole (in the case of a cast-in-place pile method), it is generally called a rebar cage After the reinforcing bars assembled in a cylindrical shape are installed in the pipe pile or in the excavation hole, the concrete is placed.

When concrete is placed by tremming in a state where the reinforcing bar is installed in the pipe pile or in the excavation hole, the operation of inserting and extracting the tremmy pipe from the inside of the reinforcing bar occurs. FIG. 15 (details will be described later) is a diagram illustrating the shape of an existing tremy tube that is widely used. The Tremy tube 3 illustrated in FIG. 15A has a corner E ₁ at the tip, and corners E ₂ and E ₃ and stepped portions G ₁ and G ₂ at the connecting portion. 15B has a corner E ₄ and a stepped portion G ₃ at the tip, and corners E ₅ and E ₆ and steps G ₄ and G at the connecting portion. Have _five . In the operation of inserting and withdrawing the tremy tube from the inside of the reinforcing bar cage, there are cases where these corners and stepped portions of the tremy tube are caught by the annular reinforcing bar of the reinforcing rod cage and the work is delayed.

  In view of the above circumstances, an object of the present invention is to provide means for smoothly inserting or pulling a tremy tube into and from a rebar cage.

In order to achieve the above-mentioned object, the present invention is a tremy pipe that is inserted into a reinforcing bar installed inside a pipe pile or a drilling hole, and in which concrete is placed in the internal space of the pipe pile or the drilling hole. A straight tubular main body having a corner or a step on the outer surface, and the rebar provided around the corner or the step, when the main body is inserted into and pulled out of the rebar cage. The main body is moved with the main body while in contact with a cage, and the corner or stepped portion passes through the inside of the annular muscle when the corner or stepped portion passes near the annular reinforcing bar of the reinforcing steel cage. A tremy tube provided with a guiding member for guiding is proposed as a first aspect.

The present invention also provides a tremie pipe according to the first embodiment described above, the guide member is a member of the cone-shaped or truncated cone-shaped tapered kicked set on the tip portion of the main body, the side surface A configuration is proposed as a second aspect in which there is no step between the main body and the side surface of the main body, and the length of the bus bar is longer than the interval between the annular bars of the reinforcing bar cage.

  Further, the present invention is the tremey tube according to the first aspect, wherein the guide member is attached to a side surface of the main body along the longitudinal direction of the main body, and a central portion is in a radial direction of the main body. A plurality of bar-like or band-like members curved so as to protrude, and each of the plurality of bar-like or belt-like members has a length between both end portions attached to the main body, and is an interval between the annular bars of the reinforcing bar cage A longer configuration is proposed as a third aspect in which the plurality of rod-like or band-like members are arranged at different positions in the circumferential direction of the main body.

According to the present invention, when the tremy tube is inserted into and pulled out from the interior of the rebar cage, even if there is a corner or a step on the outer surface of the main body of the tremy tube, the corner or step is an annular rebar of the rebar cage. Therefore, the Tremy tube can be smoothly inserted into or pulled out from the interior of the rebar cage.

The figure which showed the external appearance of the front-end | tip part vicinity of the tremy tube concerning one Embodiment. The figure which showed a mode that the front-end | tip part of the main body of the tremmy tube concerning one Embodiment was guide | induced to the guide member, and moved the inside of a cyclic | annular muscle. The figure which showed a mode that the front-end | tip part of the main body of the tremmy tube concerning one Embodiment was guide | induced to the guide member, and moved the inside of a cyclic | annular muscle. The figure which showed the external appearance of the front-end | tip part vicinity of the tremy tube concerning one Embodiment. The figure which looked at the tremy tube concerning one embodiment from the lower part. The figure which showed a mode that the front-end | tip part of the tremy tube concerning one Embodiment was guide | induced to the guide member, and moved the inside of a circular muscle. The figure which showed the positional relationship of the guide member and annular muscle concerning one Embodiment. The figure which showed a mode that the front-end | tip part of the tremy tube concerning one Embodiment was guide | induced to the guide member, and moved the inside of a circular muscle. The figure which showed the external appearance of the front-end | tip part vicinity of the tremy tube concerning one modification. The figure which illustrated the shape of the guidance member of a tremy tube concerning one modification. The figure which showed the external appearance of the front-end | tip part vicinity of the tremy tube concerning one modification. The figure which showed a mode that the connection part of the tremy tube concerning one modification was guide | induced to the guide member, and moved the inside of a cyclic | annular muscle. The figure which illustrated the shape of the guidance member of a tremy tube concerning one modification. The figure which showed the process of the concrete placement using the tremy pipe concerning a prior art. The figure which illustrated the shape of the tremy tube concerning a prior art. The figure which showed a mode that the tremy pipe concerning a prior art was suspended inside the inclined steel pipe pile.

[First Embodiment]
Prior to the description of an embodiment of the present invention, a general process for placing concrete using a tremy tube will be described. FIG. 14 is a diagram showing a process when concrete is placed in a steel pipe pile driven into the ground via a tremy pipe. FIG. 14 (A) shows a state where driving of the steel pipe pile 1 into the ground 9 is completed. FIG. 14B is a view of the steel pipe pile 1 in the state of FIG.

  Subsequently, the rebar cage 2 is suspended by the crane 8 inside the steel pipe pile 1 in the state of FIG. FIG. 14C shows a state where the arrangement of the reinforcing bar 2 with respect to the inside of the steel pipe pile 1 is completed. FIG.14 (D) is the figure which looked at the steel pipe pile 1 and the reinforcing bar 2 of the state of FIG.14 (C) from the top. The rebar cage 2 includes a plurality of linear main bars 21 arranged in a direction along the longitudinal direction of the steel pipe pile 1 and a plurality of annular ring bars 22 arranged at equal intervals in the longitudinal direction of the steel pipe pile 1. They are connected using a binding member (not shown). The plurality of main bars 21 are arranged so as to draw a circle as a whole at equal intervals along the inside of the circular line 22.

  In FIG. 14, the annular muscle 22 is disposed outside the main muscle 21. The arrangement of the annular muscle 22 is not limited to this. For example, a part or all of the annular muscle 22 may be arranged inside the main muscle 21.

  Subsequently, the tremy tube 3 is suspended by the crane 8 inside the reinforcing bar 2 in the state of FIG. FIG. 14 (E) shows a state where the suspension of the tremy tube 3 with respect to the interior of the reinforcing bar 2 is completed. In other words, the state where the tip of the tremy tube 3 has reached the lower end position of the steel pipe pile 1 is shown. In FIGS. 14E and 14G, the reinforcing bar 2 is indicated by a broken line in order to make the tremy tube 3 easy to see. FIG. 14F is a view of the steel pipe pile 1, the reinforcing bar 2, and the tremy tube 3 in the state of FIG.

  Subsequently, the concrete is supplied to the inside of the steel pipe pile 1 from the opening provided at the tip of the tremy pipe 3 in the state of FIG. With the progress of the supply of concrete to the inside of the steel pipe pile 1, the opening of the treme pipe 3 remains in the concrete at a position slightly below the upper surface of the concrete supplied to the inside of the steel pipe pile 1, The crane 8 is gradually pulled up. FIG. 14 (G) shows a state where the concrete (concrete C) is being supplied to the inside of the steel pipe pile 1.

  Thereafter, when the tip of the tremy pipe 3 reaches the upper end position of the steel pipe pile 1 and the inside of the steel pipe pile 1 is filled with concrete, the placement of the concrete into the steel pipe pile 1 is completed.

  FIG. 15 is a diagram illustrating the shape of an existing tremy tube 3 that is widely used as described above. The tremy tube 3 illustrated in FIGS. 15A and 15B is formed by connecting a plurality of tremy tubes. In FIG. 15A and FIG. 15B, two tremy tubes connected to each other, that is, a tremy tube 31 and a tremy tube 32 are illustrated. 15A and 15B has a flange 311T at the upper end, that is, at the end on the connecting portion side with the tremy tube 32. 15A and 15B has a flange 321B at the lower end, that is, the end on the connecting portion side with the tremy tube 31. A plurality of holes are provided in the flange 311T and the flange 321B, for example, so as to communicate with each other in the vertical direction in the drawing, and the bolts that pass through these holes are tightened with nuts to connect the tremy tube 31 and the tremy tube 32. Is done.

  The tremy tube 31 illustrated in FIG. 15A does not have a flange at the lower end, that is, the tip of the tremy tube 3. This is because no other tremy tube is connected to the lower side of the tremy tube 31 located at the lowermost portion of the tremy tube 3, and therefore a connecting flange is unnecessary. On the other hand, there is a case where a Tremy tube having the same shape is used without distinction between the lowermost portion and the middle portion. In that case, as shown in FIG. 15 (B), the tremy tube 31 has a flange 311B similar to the flange 321B of the tremy tube 32 at the lower end.

  Then, the problem which may arise in the general process of concrete placement using the above-mentioned tremy pipe is explained. The longitudinal direction of the pile in the pile foundation shown in FIG. 14 is generally vertical, but the longitudinal direction of the pile in the pile foundation may be inclined with respect to the vertical direction. For example, when a pile foundation is used as a foundation for a harbor structure, in order to resist the horizontal load and reaction of the harbor structure when the ship shores, the pile should be inclined to the sea side or the land side. May be placed.

  FIG. 16 shows a state in which the tremy tube 3 having the shape illustrated in FIG. 15 is being hung or pulled up with respect to the inside of the steel pipe pile 1 driven into the ground 9 at an angle inclined with respect to the vertical direction. Show. In FIG. 16A, in order to make it easy to see the positional relationship between the tremy tube 3 and the annular muscle 22, the reinforcing bar 2 is indicated by a broken line, and some of the main bars 21 are not shown. In the example shown in FIG. 16, the position of the reinforcing bar 2 inside the steel pipe pile 1 is projected outward from the main body of the cylindrical reinforcing bar 2 assembled by the main bar 21 and the annular bar 22 so as not to be biased by gravity. As described above, a plurality of spacer bars 23 are attached to the main bar 21.

  FIG. 16B shows an enlarged view of the vicinity of the tip of the tremy tube 3 in the state shown in FIG. As shown in FIG. 16 (B), when the tremy tube 3 is suspended inside the reinforcing bar 2 installed at an angle inclined with respect to the vertical direction, the corners and stepped portions of the tremy tube 3 are formed of the reinforcing bar 2. There is a case where the ring-shaped muscle 22 is caught. FIG. 16B shows the case where the treme tube 3 illustrated in FIG. 15A is used, but the case where the treme tube 3 illustrated in FIG. 15B is also used. Similar problems can arise. If the corners or steps of the tremmy tube 3 are caught by the annular muscle 22 when the tremmy tube 3 is suspended, not only the tremy tube 3 does not enter the steel pipe pile 1 smoothly, but also the weight of the tremy tube 3 There is a risk that the circular muscle 22 may be damaged by this.

  In addition, as illustrated in FIG. 16C, when the tremy tube 3 is pulled out from the inside of the reinforcing bar 2, the stepped portion of the tremy tube 3 may be caught by the annular muscle 22. Also in this case, the tremmy tube 3 is prevented from being pulled out and the annular muscle 22 may be damaged.

  The problem described above is not limited to the case where the longitudinal direction of the pile is inclined with respect to the vertical direction, and may occur even if the longitudinal direction of the pile is the vertical direction. For example, if the tremy tube 3 being inserted into the rebar cage 2 or being pulled out of the rebar cage 2 swings in a state where it is suspended by the crane 8, the corners and stepped portions of the tremy tube 3 are annular muscles 22. There is a risk of getting caught.

  The present invention provides a technique for solving the above-described problems. The tremy tube 4 according to one embodiment of the present invention will be described below. FIG. 1 is a view showing the appearance of the vicinity of the tip portion of the tremy tube 4. The tremy tube 4 includes a straight tubular main body 41, one or more openings 42 provided in the vicinity of the front end 411 of the main body 41, and a guide member 43 provided continuously to the front end 411 of the main body 41.

  The main body 41 is a tubular member that forms a movement path of concrete pumped by the pump, and guides the concrete for filling to the inside of the pipe pile or the excavation hole. The opening 42 serves as a discharge port for discharging the concrete that has passed through the inside of the main body 41 and has reached the vicinity of the tip 411 of the main body 41. The number of openings 42 is two, for example, but the number is not limited to two.

  As shown in FIG. 1, the guide member 43 is a tapered conical member that is provided continuously to the distal end portion 411 of the main body 41. The guide member 43 may be connected to the main body 41 by welding, screwing, or the like, or may be formed integrally with the main body 41. The length of the bus bar of the guide member 43 (hereinafter referred to as “length M”) is the interval between the annular bars of the reinforcing bar that accepts the insertion of the tremy tube 4, that is, the length between two adjacent annular bars ( Hereinafter, it is longer than “length L”.

The guide member 43 moves together with the main body 41 while contacting the rebar cage when the tremy tube 4 is inserted into or pulled out of the rebar cage disposed inside the pipe pile or the excavation hole. corners E ₁₁ when the corner portion E ₁₁ of the distal portion 411 passes near the annular muscle rebar cage leads to body 41 so as to pass through the inside of the annular muscles.

FIG. 2 is a view showing a state in which the corner E ₁₁ of the tremy tube 4 moves inside the annular muscle without being guided by the guide member 43 and caught by the annular muscle. In FIG. 2 and FIG. 3 to be described later, in order to make it easy to see the positional relationship between the tremy tube 4 and the annular muscle 22, the reinforcing bar 2 is indicated by a broken line, and some of the main reinforcing bars 21 are not shown. Hereinafter, as shown in FIG. 2, when distinguishing the plurality of annular muscles 22 from each other, branch numbers are given to the reference numerals like the annular muscle 22-1, the annular muscle 22-2,.

FIG. 2 (A) shows a state in which the tremy tube 4 suspended inside the reinforcing bar 2 in the steel pipe pile 1 driven into the ground 9 at an angle inclined with respect to the vertical direction first contacts the reinforcing bar 2. Show. In the state of FIG. 2 (A), the tremie tube 4 is in contact with the annular muscle 22-3 in P ₁₁ points on the sides of the guide member 43.

Thereafter, the tremy tube 4 moves downward, and is in the state of FIG. In the state of FIG. 2 (B), the tremie tube 4 is in contact with the annular muscle 22-3 in terms P ₁₂ on the corners E _11.

Thereafter, the tremy tube 4 further moves downward, and is in the state of FIG. In the state of FIG. 2C, the tremy tube 4 contacts the annular muscle 22-3 at a point P ₁₃ on the side surface of the main body 41, and the annular muscle 22-4 at a point P ₁₄ on the side surface of the guide member 43. In contact.

Thereafter, the tremy tube 4 further moves downward, and is in the state of FIG. In the state of FIG. 2 (D), the tremie tube 4 is in contact with the annular muscle 22-4 in terms P ₁₅ on the side of the guide member 43.

Thereafter, the tremy tube 4 further moves downward, and the state shown in FIG. In the state of FIG. 2 (E), tremie tube 4 is in contact with the annular muscle 22-4 in P ₁₆ points on the corners E _11.

Between the state shown in FIG. 2 (C) up to the state shown in FIG. 2 (E), the guide member 43 while moving along with the body 41 in contact therewith an annular muscle 22-4, an annular muscle corners E ₁₁ 22-4 Lead inside. As a result, the corner E ₁₁ is not caught by the annular muscle 22-4, and the descent of the tremy tube 4 is not hindered.

Thereafter, the tremy tube 4 moves further downward. At that time, the guide member 43 guides the corner E ₁₁ to the inside of the annular muscle 22-5 and the subsequent annular muscle 22 in the same manner as when the corner E ₁₁ is guided to the inside of the annular muscle 22-4.

  When the insertion of the tremy tube 4 into the rebar cage 2 proceeds, the side surface of the main body 41 comes into contact with the annular muscle 22-1 and thereafter, the position of the tremy tube 4 in the reinforcing rod 2 is the annular muscle 22-1. Being regulated by. As a result, with the progress of the insertion of the tremy tube 4, the longitudinal direction of the tremy tube 4 is inclined so as to be along the longitudinal direction of the steel pipe pile 1 rather than the vertical direction.

Figure 3 is a state where the side of the body 41 is in contact annular muscle 22-1 at the point P _17, the longitudinal direction of the tremie tube 4 is inclined along the longitudinal direction of the steel pipe pile 1 than the vertical direction, the guide member 43 has shown the state which contacted the new circular muscle 22. FIG. As is clear when FIG. 3 is compared with FIG. 2 (C), as the longitudinal direction of the tremy tube 4 tilts along the longitudinal direction of the steel pipe pile 1, the guide member 43 comes into contact with the new annular muscle 22. The position (for example, point P _{19 in} FIG. 3) moves upward (position closer to the connection position with the main body 41). However, even in a state where the longitudinal direction of the tremy tube 4 is inclined so as to be along the longitudinal direction of the steel pipe pile 1, there is no change in that the corner portion E ₁₁ is guided to the inside of the annular muscle 22 by the guide member 43.

As described above, according to the tremy tube 4, the corner E ₁₁ is guided to the inside of the annular muscle 22 by the guide member 43 when the tremy tube 4 is inserted into the reinforcing bar 2. The portion E ₁₁ is not caught by the annular muscle 22.

[Second Embodiment]
The tremy tube 5 according to one embodiment of the present invention will be described below. FIG. 4 is a view showing the appearance of the vicinity of the tip portion of the tremy tube 5. FIG. 5 is a view of the tremy tube 5 as viewed from below. The tremy tube 5 is a straight tubular main body 51, an opening 52 provided in the distal end portion 511 of the main body 51, and four curved rod-shaped members attached to the side surface near the distal end portion 511 of the main body 51. A guide member 53 is provided. The number of guide members 53 is not limited to four, and may be two to three, or five or more.

  Each of the four guide members 53 has one end attached to the fastening band 54 and the other end attached to the fastening band 55. The fastening band 54 and the fastening band 55 are metal bands shaped in an annular shape, and are bent so that both ends rise substantially perpendicularly to the side surface of the main body 51 when attached to the outer surface of the main body 51. . A hole is provided in the bent portion, and the fastening band 54 and the fastening band 55 are firmly fixed to the main body 51 by tightening a bolt through the hole with a nut.

  The guide member 53 is attached to the main body 51 via the fastening band 54 and the fastening band 55. The guide member 53 may be attached to the main body 51 without using the fastening band 54 and the fastening band 55, for example, by welding.

  The longitudinal direction of the guide member 53 is a direction along the longitudinal direction of the main body 51. Further, the guide member 53 is curved so that the center portion projects in the radial direction of the main body 51. The length between the both end portions of the guide member 53 (hereinafter referred to as “length N”) is the interval between the rebar cages that accept the insertion of the tremy tube 5, that is, between two annular muscles adjacent to each other. Longer than length L. Further, the four guide members 53 are arranged at different positions in the circumferential direction of the main body 51.

The guide member 53 moves together with the main body 51 while contacting the rebar cage when the tremy tube 5 is inserted into or pulled out of the rebar cage disposed inside the pipe pile or the excavation hole. The corner E ₂₁ of the tip 511 is guided to the inside of the rebar cage ring.

FIG. 6 is a view showing a state in which the corner E ₂₁ of the tip 511 of the tremy tube 5 moves inside the annular muscle without being guided by the guide member 53 and caught by the annular muscle. In FIG. 6 and FIG. 8 to be described later, in order to make it easy to see the positional relationship between the tremy tube 5 and the annular muscle 22, the reinforcing bar 2 is indicated by a broken line, and a part of the main reinforcement 21 is not shown. FIG. 6 (A) shows a state in which the tremy tube 5 suspended inside the reinforcing bar 2 in the steel pipe pile 1 driven into the ground 9 at an angle inclined with respect to the vertical direction first contacts the reinforcing bar 2. Show. In the state of FIG. 6 (A), the tremie pipe 5 is in contact with the annular muscle 22-3 in P ₂₁ points on the outer surface of one of the guide member 53.

  Depending on the relationship between the direction of inclination of the reinforcing bar 2 and the positions of the four guide members 53 around the axis of the tremy tube 5, the two guide members 53 may simultaneously contact the annular bars 22-3. FIG. 7 is a diagram schematically showing the positional relationship between the annular muscle 22 and the four guide members 53. If the positional relationship between the annular muscle 22 and the guiding member 53 is the positional relationship illustrated in FIG. 7A, the number of the guiding members 53 that contact the annular muscle 22 is one and is illustrated in FIG. 7B. If it is such a positional relationship, the number of guide members 53 in contact with the annular muscle 22 is two.

FIG. 6 (B) with the tremie pipe 5 from the state shown in FIG. 6 (A) moves downward, the guide member 53 contacts the annular muscle 22-3 in terms P ₂₂ on the outer surface, at a point P ₂₃ The state which is contacting the annular muscle 22-4 is shown.

Thereafter, as shown in FIG. 6C, the tremy tube 5 further moves downward while the guide member 53 is in contact with the annular muscle 22-4 at one point on the outer surface (point P _{24 in} FIG. 6C). move, the state of FIG. 6 (D), the other words, a state where the guide member 53 contacts with the annular muscle 22-4 in terms P ₂₅ on the outer surface, in contact with the annular muscle 22-5 at the point P ₂₆ To.

Figure 6 between the states up to the state shown in FIG. 6 (D) (B), the guide member 53 while moving along with the body 51 in contact therewith an annular muscle 22-4, annular muscle 22-5 corners E ₂₁ Lead inside. As a result, the corner E ₂₁ is not caught by the annular muscle 22-5, and the descent of the tremy tube 5 is not prevented.

Thereafter, the tremy tube 5 further moves downward. At that time, the guide member 53, a corner portion E ₂₁ in the same manner as when induced inside the annular muscle 22-5, induces inside the annular muscle 22-6 and subsequent annular muscle 22.

  When the insertion of the tremy tube 5 into the interior of the reinforcing bar 2 proceeds, the side surface of the main body 51 comes into contact with the annular muscle 22-1 and thereafter, the position of the tremy tube 5 within the reinforcing bar 2 is the annular muscle 22-1. Being regulated by. As a result, with the progress of the insertion of the tremy tube 5, the longitudinal direction of the tremy tube 5 is inclined so as to be along the longitudinal direction of the steel pipe pile 1 rather than the vertical direction.

Figure 8 is a state where the side of the body 51 is in contact annular muscle 22-1 at the point P _27, the longitudinal direction of the tremie pipe 5 is inclined along the longitudinal direction of the steel pipe pile 1 than the vertical direction, the guide member 53 shows a state in which two annular muscles 22 are simultaneously in contact at points P ₂₈ and P ₂₉ . As is clear from comparison of FIG. 8 with FIG. 6D, the guide member 53 simultaneously contacts the two annular bars 22 as the longitudinal direction of the tremy tube 5 tilts along the longitudinal direction of the steel pipe pile 1. The positions (points P ₂₈ and P _{29 in} FIG. 8) move upward (positions closer to the fastening band 54). However, even when the longitudinal direction of the tremie tube 5 is close to the longitudinal direction of the steel pipe pile 1, it does not change that corners E ₂₁ is guided inside the annular muscle 22 by the guide member 53.

As described above, according to the tremy tube 5, the corner portion E ₂₁ is guided to the inside of the annular muscle 22 by the guide member 53 when the tremy tube 5 is inserted into the reinforcing bar 2. The portion E ₂₁ is not caught by the annular muscle 22.

[Modification]
The above-described embodiments are specific examples of the present invention, and various modifications can be made within the scope of the technical idea of the present invention. Examples of these modifications are shown below. The following two or more modified examples may be combined as appropriate.

(1) In the first embodiment and the second embodiment described above, the tremy tube 4 or the tremy tube 5 is inserted into a reinforcing bar placed inside the pipe pile. Instead of this, the tremy tube 4 or the tremy tube 5 may be inserted into a rebar cage disposed inside the excavation hole.

(2) In the first and second embodiments described above, the tremy tube 4 or the tremy tube 5 is inserted into a pipe pile installed in a direction inclined with respect to the vertical direction. Instead of this, the tremy pipe 4 or the tremy pipe 5 may be inserted into a pipe pile installed in the vertical direction or an excavation hole formed in the vertical direction.

(3) In the first embodiment and the second embodiment described above, the steel pipe pile 1 is a circular pipe. The cross-sectional shape of the steel pipe pile 1 is not limited to a circle, and may be a rectangle, for example. Similarly, the shape of the annular bar 22 of the reinforcing bar 2 is not limited to a circle, and may be a rectangle, for example.

(4) In the first embodiment and the second embodiment described above, the main bar 21 of the reinforcing bar 2 contacts the annular bar 22 from the inside. Instead, the main bar 21 of the reinforcing bar 2 may contact the annular bar 22 from the outside.

(5) In the first embodiment described above, the guide member 43 is a conical member. Instead, the guide member 43 may be a frustum-shaped member. FIG. 9 is a view showing the appearance of the vicinity of the tip of the tremy tube 4 according to this modification. Also in this modification, the length M of the bus bar of the frustum-shaped guide member 43 may be longer than the length L that is the interval between the annular muscles 22. In the present application, when the shape of the guide member 43 is a frustum shape or a frustum shape, the shape may not be a strict cone or a truncated cone. For example, as shown in FIG. 10A, a cone having a rounded apex may be adopted as the shape of the guide member 43. Further, as shown in FIG. 10B, a cone having a curved side surface may be employed as the shape of the guide member 43.

(6) In 2nd Embodiment mentioned above, the guide member 53 is a rod-shaped member. Instead of this, the guide member 53 may be a band-shaped member.

(7) In the above-described second embodiment, the tremy tube 5 that does not have a step portion at the distal end portion 511 is employed. It replaces with this and the tremy tube 5 which has a level | step-difference part in the front-end | tip part 511 may be employ | adopted. FIG. 11 is a view showing the appearance of the vicinity of the tip of the tremy tube 5 according to this modification. The tremy tube 5 illustrated in FIG. 11 has a flange 56 at the tip 511. Therefore, the tremy tube 5 has a corner E ₃₁ and a stepped portion G ₃₁ at the tip 511. Also in this modification, since the corner E ₃₁ is guided to the inside of the annular muscle 22 by the guide member 53 when the tremy tube 5 is inserted into the reinforcing bar 2, the corner E ₃₁ becomes the annular muscle. 22 is not caught. Further, in this modified example, when the tremy tube 5 is pulled out from the inside of the reinforcing bar 2, the stepped portion G ₃₁ is guided to the inside of the annular muscle 22 by the guide member 53, so that the stepped portion G ₃₁ is 22 is not caught.

(8) In the second embodiment described above, the guide member 53 is disposed around the corner of the tip 511 of the main body 51 of the tremmy tube 5 and guides the corner to the inside of the annular muscle 22. In addition to or instead of the guide member 53 that leads the corner portion of the tip portion 511 to the inside of the annular muscle 22, the tremy tube 5 has a corner portion or a step portion that is provided in a portion other than the tip portion (for example, a connecting portion). You may provide the guide member arrange | positioned at the periphery and guide | induces the said corner | angular part or level | step-difference part to the inner side of the cyclic | annular muscle 22. FIG.

  FIG. 12 is a view showing the appearance of the tremy tube 5 according to this modification. The tremy tube 5 illustrated in FIG. 12 is obtained by connecting the tremy tube 5A and the tremy tube 5B. The tremy tube 5 is generated by a flange 511T and a flange 512B protruding outward at the connecting portion between the tremy tube 5A and the tremy tube 5B, in addition to the guide member 53-1, which is provided around the corner of the tip portion 511. The guide member 53-2 is provided so as to cover the outside of the corner portion and the step portion. The guide member 53-2 moves while contacting the annular muscle 22, and guides corners and step portions near the connecting portion to the inside of the annular muscle 22. As a result, the corner portion and the stepped portion are not caught by the annular muscle 22, and the descending or raising of the tremy tube 5 is not hindered.

(9) The shape of the guide member included in the tremy tube according to the present invention is not limited to the shape of the guide member 43 in the above-described first embodiment and the shape of the guide member 53 in the above-described second embodiment. When the tremmy tube main body is inserted into or pulled out of the reinforcing bar cage, it moves with the tremy tube main body while touching the reinforcing bar cage. Or if it is a guide member which guides a level | step-difference part to the inner side of the cyclic | annular reinforcement of a reinforcing bar, the shape will not be limited. For example, as shown in FIG. 13, a curved plate-like member attached so as to cover the entire side surface in the vicinity of the distal end portion of the main body of the tremy tube may be employed as the guide member 63.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile, 2 ... Rebar cage, 3 ... Tremy pipe, 4 ... Tremy pipe, 5 ... Tremy pipe, 5A, 5B ... Tremy pipe, 8 ... Crane, 9 ... Ground, 21 ... Main reinforcement, 22 ... Ring reinforcement, 23 ... spacer streak, 31 ... tremy tube, 32 ... tremy tube, 41 ... main body, 42 ... opening, 43 ... guide member, 51 ... main body, 52 ... opening, 53 ... guide member, 63 ... guide member, 54 ... fastening Band, 55 ... Fastening band, 411 ... Tip, 511 ... Tip

Claims (3)

A tremey pipe inserted into a steel bar installed inside a pipe pile or excavation hole, and placing concrete in the internal space of the pipe pile or excavation hole,
A straight tubular body having a corner or step on the outer surface;
When the main body is inserted into and pulled out from the inside of the reinforcing bar cage, the main body moves with the main body while contacting the reinforcing bar cage, and the corner portion or the stepped portion is provided around the corner portion or the stepped portion. And a guide member for guiding the main body so that the corner portion or the stepped portion passes through the inside of the annular muscle when passing near the annular muscle of the rebar cage. The guide member, the a conical shape or truncated cone-shaped member of tapering which kicked setting the distal end of the body, there is no step between the side surface of the the side body, the length of the bus bars The tremy tube according to claim 1, wherein the tremy tube is longer than an interval between the annular bars of the reinforcing bar cage. The guide member is a plurality of rod-like or belt-like members that are attached to the side surface of the main body along the longitudinal direction of the main body and curved so that a central portion projects in the radial direction of the main body.
Each of the plurality of rod-like or belt-like members has a length between both ends attached to the main body longer than an interval between the annular bars of the reinforcing bar cage,
The tremy tube according to claim 1, wherein the plurality of rod-shaped or belt-shaped members are arranged at different positions in the circumferential direction of the main body.

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