JP5506122B2 - Reinforcement method of outer steel tube concrete composite pile - Google Patents

Description

  The present invention relates to a method for revealing a reinforcing bar of a shell steel pipe concrete composite pile in which a plurality of axial reinforcing bars are embedded in the head of a pile main body.

  When the pile and footing are connected after burying the outer shell steel pipe concrete composite pile (SC pile), as shown in FIGS. 7 (a) to 7 (b), the outer shell steel pipe 2 at the top of the SC pile 1 is formed. The cuts 3 and 4 are made, and only the outer shell steel pipe 2 at the top of the pile is peeled off, and the concrete 5 of the pile body is broken as shown in FIGS. A construction method is used in which the reinforcing reinforcing bars 6 embedded in 5 are pulled out and the SC piles 1 and the footings 7 are coupled via the reinforcing reinforcing bars 6 as shown in FIG.

  As described above, the operation of peeling off the outer shell steel pipe 2 of the SC pile 1 involves cutting the outer shell steel pipe 2 and requires a lot of time and labor. Further, the outer shell steel pipe 2 winds a flat plate. Therefore, there is a possibility that the constrained outer shell steel pipe 2 may be repelled when the outer shell steel pipe 2 is cut in the cutting operation of the outer shell steel pipe 2.

  On the other hand, there is an SC pile in which a concrete cylindrical body is exposed from its end face over a predetermined length and the remaining portion of the concrete cylindrical body is covered with a shell steel pipe. This SC pile has the advantage that it can eliminate the labor in the work of fusing and removing the coated outer shell steel pipe when exposing a plurality of anchor reinforcing bars (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 7-18675 (page 2-3, FIG. 4-5)

  However, even with such SC piles that omit some of the outer shell steel pipes, it is necessary to break the concrete at the top of the piles and lift out the reinforcing bars, which takes time and effort. For this reason, there is a problem that the cost burden increases, and there is a possibility that the internal reinforcing steel bars may be damaged when the concrete is crushed.

  This invention is made | formed in view of such a point, and it aims at providing the method of revealing the reinforcing steel of a shell steel pipe concrete composite pile which can simplify a concrete crushing and reinforcing steel bar lifting operation.

The invention described in claim 1 is a pile main body formed of concrete, and a removal plan that is formed on one end of the pile main body via a partition seat plate and is releasably fastened to the pile main body. A concrete part, a plurality of axial rebars embedded in the concrete part from the pile body part to the concrete part to be removed, and a shaft that is respectively fitted to a part corresponding to the concrete part to be removed among these axial reinforcing bars. A pipe that prevents the directional reinforcing bar and the concrete part to be removed from being joined, a shell steel pipe provided on the outer peripheral surface of the pile body part, and a concrete exposed part without the outer steel pipe formed on the outer peripheral surface of the concrete part to be removed a method of representing a rebar shell steel concrete composite piles provided with the bets, to release the clamping fixation of the to be removed concrete section, lifting the removal planned concrete section, from the pile body portion Pull the isolated removal planned concrete section from the longitudinal bars, is a method of representing the rebar shell steel concrete composite piles were to reveal longitudinal bars.

  The invention described in claim 2 is a pile main body formed from concrete, a concrete to be removed formed at one end of the pile main body via a partition plate, and concrete to be removed from the pile main body. A plurality of axial rebars embedded within them, and the axial rebars and the concrete portions to be removed are respectively fitted to the portions corresponding to the concrete portions to be removed of these axial rebars. Pipes to be blocked, screws formed on the outer ends of the respective axial reinforcing bars, nuts to be screwed into these screws to fix the concrete part to be removed to the pile body part, and the outer periphery of the pile body part A method for revealing the reinforcing steel of a steel pipe concrete composite pile with a shell steel pipe provided on the surface and a concrete exposed part without a shell steel pipe formed on the outer peripheral surface of the concrete part to be removed Clamping with nuts is released, the concrete part to be removed is lifted, the concrete part to be removed separated from the pile main body part is pulled out from the axial rebar, and the outer shell steel pipe concrete composition is made to reveal the axial rebar. It is a method to reveal the reinforcing bars of the pile.

According to the first aspect of the present invention, the concrete portion to be removed is fastened and fixed to the pile main body so as to be releasable. Therefore, the concrete portion to be removed can be integrated with the pile main body until the fastening is released. The product value such as cracking of the concrete part to be removed can be prevented, and the pile body part formed by concrete in the outer shell steel pipe concrete composite pile can be connected to one end part of this pile body part through a partition plate. A plurality of axial rebars are embedded inside the concrete part to be removed, and the pipes are fitted to the parts corresponding to the concrete part to be removed, and the axial rebar and the part are to be removed. since blocking binding to the concrete part, when representing the longitudinal bars, to release the clamping fixation of the to be removed concrete section, longitudinal bars by the tubes By lifting the concrete part to be removed that is prevented from joining, only the concrete part to be removed can be easily pulled out, and the crushing of concrete and the lifting of the axial rebar can be simplified. Save time, burden and money.

  According to the second aspect of the present invention, the concrete portion to be removed is fastened and fixed to the pile body portion by the screws respectively formed at the outer end portions of the respective axial reinforcing bars and the nuts screwed to these screws. Until it is released, the concrete part to be removed can be integrated with the main body of the pile, and the product value such as cracks in the concrete part to be removed can be prevented from being reduced. By releasing the fastening and lifting the concrete part to be removed, only the concrete part to be removed can be easily pulled out, and the work of crushing concrete and lifting off the axial rebar can be simplified. The time, burden and cost required can be reduced.

(A) is sectional drawing which shows one Embodiment of the outer shell steel pipe concrete composite pile concerning this invention, (b) is sectional drawing which expanded the b part of (a), (c) is c part of (a) (D) is sectional drawing to which the d section of (a) was expanded. It is a top view of a pile same as the above. It is the III-III sectional view taken on the line of Fig.1 (a). It is the IV-IV sectional view taken on the line of Fig.1 (a). It is the VV sectional view taken on the line of Fig.1 (a). It is explanatory drawing which shows the construction example when showing the reinforcement of a pile same as the above, (a) is a perspective view of a pile same as the above, (b) is a perspective view of the process of removing the concrete part to be removed of the pile same as above, (c) is the same as above It is a perspective view after removing the removal planned concrete part of a pile. It is explanatory drawing which shows the construction example when showing the reinforcement of the conventional outer shell steel pipe concrete composite pile, (a) is a perspective view of the state which cut | disconnected the outer shell steel pipe of the same pile, (b) is the same pile The perspective view which shows the state which peeled off a part of outer shell steel pipe, (c) is a perspective view which shows the state which protruded the reinforcement reinforcement of the same pile, (d) is a cross section which shows the combined state of the same pile and footing FIG.

  Hereinafter, the present invention will be described in detail based on one embodiment shown in FIGS.

  FIG. 1 shows an outer shell steel pipe concrete composite pile (hereinafter referred to as SC pile) 11, a pile body portion 12 is formed of concrete, and a concrete portion 13 to be removed is continuously formed at one end of the pile body portion 12. Has been. These pile main body portion 12 and the concrete portion 13 to be removed are centrifugally molded in a common centrifugal molding frame.

  As shown in FIGS. 1, 3, and 5, an outer shell steel pipe 14 is provided on the outer peripheral surface of the pile main body 12, and the concrete exposed without the outer shell steel pipe 14 is provided on the outer peripheral surface of the concrete portion 13 to be removed. Part 15 is molded.

  As shown in FIG. 1 (a), a plurality of axial reinforcing bars 16 are arranged in a cylindrical shape as shown in FIGS. 2 to 5 from the pile main body portion 12 to the concrete portion 13 to be removed. Embedded.

  As shown in FIGS. 1 (a), (b), (c) and FIG. 3, the axial rebar 16 and the concrete to be removed are included in the portion corresponding to the concrete part 13 to be removed of these axial reinforcing bars 16. Tubes 17 that prevent the coupling with the part 13 are respectively fitted.

  As shown in FIG. 1 (b), seat plate fitting portions 20 are provided at the outer ends of the respective axial reinforcing bars 16, and these seat plate fitting portions 20 are shown in FIG. 6 (b). As shown in FIGS. 1A and 1B, a ring-shaped seat plate 22 having a through hole 21 is fitted at the position of the axial reinforcing bar, and a screw 23 is formed at the outer end of each axial reinforcing bar 16, respectively. As shown in FIG. 2, the seat plate 22 is fastened by a nut 24 that is screwed with these screws 23.

  As shown in FIGS. 1 (a), (c), (d) and FIG. 4, ring-shaped dividers welded to the upper and lower ends of the outer shell steel pipe 14 are attached to the upper and lower ends of the pile main body 12. A plate 25 and a bottom seat plate 26 are arranged.

  As shown in FIG. 1 (a), on the inner peripheral side of the plurality of axial rebars 16 arranged in a cylindrical shape, a deformed intramuscular ring 27 arranged in the pile main body 12 is provided. On the outer peripheral side of the plurality of tubes 17 arranged in a cylindrical shape, a deformed bar outer ring 28 arranged in the concrete portion 13 to be removed is provided.

  Next, the method and effect of the above embodiment will be described with reference to FIGS.

  As shown in FIG. 1 and FIG. 6 (a), the SC pile 11 in a state where the outer shell steel pipe in the portion of the outer shell steel pipe 14 where cutting / peeling of the top of the pile is removed is removed from the factory centrifugal molding machine. Manufactured by.

  In this SC pile 11, a plurality of axial rebars 16 arranged in a cylindrical shape penetrate the inside of the concrete portion 13 to be removed from the upper end portion of the pile body portion 12, and the tip of each axial rebar 16 Since each part protrudes from the upper end surface of the concrete part 13 to be removed and each of their tip parts is threaded, as shown in FIG. A ring-shaped seat plate 22 having a through-hole 21 at the position of the axial rebar is fitted and fixed by tightening each with a nut 24 screwed to each screw 23, and the pile main body 12 and planned to be removed during handling The risk of cracks and the like in the concrete portion 13 is prevented, and the product function is not impaired.

  The concrete part 13 to be removed corresponds to a part where the conventional concrete is crushed and the rebar is lifted, and a plurality of axial reinforcing bars 16 are arranged in a circle inside the concrete part 13 to be removed. By manufacturing the piles by covering each of the axial rebars 16 with pipes 17 respectively, the concrete of the concrete part 13 scheduled to be removed by these pipes 17 is eliminated and planned to be removed Even if the concrete of the concrete part 13 is not crushed, the concrete part 13 to be removed is separated from the pile body part 12 by lifting the concrete part 13 to be removed by a heavy machine such as a crane as shown in FIG. 6 (b). In this case, only the concrete part 13 to be removed can be pulled out from each axial reinforcing bar 16, and as shown in FIG. 6 (c), the axial reinforcing bar 16 arranged in a cylindrical shape can be shown. It is possible.

  In this way, the tightening and fixing by the nut 24 is released, the concrete part 13 to be removed is lifted, and the concrete part 13 to be removed separated from the pile body part 12 is pulled out from the axial rebar 16 so that the axial rebar 16 appears. To. A plurality of axial reinforcing bars 16 are embedded inside the pile main body portion 12 formed of concrete, and the concrete portion 13 to be removed continuously formed at one end portion of the pile main body portion 12, and these axial directions are embedded therein. Since the pipes 17 are respectively fitted to the portions of the reinforcing bars 16 corresponding to the concrete portions 13 to be removed to prevent the axial reinforcing bars 16 and the concrete portions 13 to be removed from being connected, the pipes 17 are connected to the axial reinforcing bars 16 and 16. It is possible to easily extract only the concrete part 13 to be removed, which is prevented from joining, and to crush the concrete and to lift the axial rebar 16 can be simplified, reducing the time, burden and cost required for these operations. it can. The risk of damaging each axial rebar 16 during the lifting operation can also be prevented.

  In addition, the outer shell steel pipe 14 is partially removed, and the concrete exposed portion 15 without the outer shell steel pipe 14 is formed on the outer peripheral surface of the concrete portion 13 to be removed, so that a part of the outer shell steel pipe 14 is removed to expose the concrete. Stripping work can be omitted, and various problems that occur during steel pipe stripping work can be eliminated. In short, by partially eliminating the outer shell steel pipe 14, problems that occur during the peeling operation of the outer shell steel pipe 14 are eliminated, and the cost reduction effect can also be obtained by eliminating the outer shell steel pipe 14 and the outer shell steel pipe removal process.

  Furthermore, the pile structure that eliminates the outer steel pipe 14 corresponding to the concrete part 13 to be removed, and covers the surrounding axial rebar 16 corresponding to the concrete part 13 to be removed with the pipe 17 to eliminate adhesion with the concrete is There is a risk that the SC pile 11 will be cracked at the time of movement and construction, causing cracks in the concrete part 13 to be removed and reducing the product value, but it is provided at the outer end of each axial rebar 16 respectively. A ring-shaped seat plate 22 is fitted to the seat plate fitting portion 20 formed, and a seat plate is formed by screws 23 formed on the outer end portions of the respective axial reinforcing bars 16 and nuts 24 screwed to these screws 23. Since 22 is fastened to the concrete part 13 to be removed, the concrete part 13 to be removed can be integrated with the pile main body part 12 by the pressing action of the ring-shaped seat plate 22 until the fastening by the nut 24 is released. Planned removal concrete part 13 A decrease in product value, such as cracks can be prevented.

  That is, the pile steel structure in which the outer shell steel pipe 14 is eliminated at the time of factory manufacture, the axial rebar 16 in the pile body is covered with the pipe 17 and the adhesion with the concrete is eliminated, the SC structure during the movement in the factory and during construction When handling piles 11, it is often the case that a hanging tool is hung on the cavity at both ends of the pile, or a wire rope is wound around two places in the axial direction. The ring-shaped seat plate 22 is fitted to the seat plate fitting portion 20 provided at the outer end portion of each axial reinforcing bar 16, and the outer end portion of each axial reinforcing bar 16 is attached to the outer end portion of each axial reinforcing bar 16. Since the seat plate 22 is fastened to the concrete portion 13 to be removed by the screws 23 formed and the nuts 24 screwed to these screws 23, the compressive force from the ring-shaped seat plate 22 is applied to the concrete portion 13 to be removed. By tightening and fixing to act, The deterioration in the quality of products, such as cracks in the planned concrete section 13 can be prevented.

  The present invention can be used for the SC pile 11 manufactured by a centrifugal molding machine.

11 Shell steel pipe concrete composite pile (SC pile)
12 Pile body
13 Concrete part to be removed
14 Outer shell steel pipe
15 Exposed concrete
16 axial rebar
17 tubes
23 screws
24 nuts
25 Partition board

Claims (2)

A pile body formed of concrete;
A concrete part to be removed that is formed on one end of this pile body part via a partition plate and fastened and fixed to the pile body part so as to be releasable ,
A plurality of axial rebars embedded within the pile body from the pile body to the concrete part to be removed;
Pipes that are respectively fitted to portions corresponding to the concrete portion to be removed among these axial rebars and prevent the connection between the axial rebar and the concrete portion to be removed,
An outer shell steel pipe provided on the outer peripheral surface of the pile body,
A method of revealing the reinforcing steel of the outer steel pipe concrete composite pile, which has a concrete exposed part without the outer steel pipe formed on the outer peripheral surface of the concrete part to be removed,
Release the fastening of the concrete part to be removed,
Lift the concrete part to be removed,
Pull out the concrete part to be removed separated from the pile body part from the axial rebar,
A method for revealing the reinforcement of a steel pile concrete composite pile, characterized by revealing the axial rebar. A pile body formed of concrete;
The concrete part to be removed, which is formed on one end of this pile body part via a partition plate,
A plurality of axial rebars embedded within the pile body from the pile body to the concrete part to be removed;
Pipes that are respectively fitted to portions corresponding to the concrete portion to be removed among these axial rebars and prevent the connection between the axial rebar and the concrete portion to be removed,
Screws respectively formed on the outer end of each axial rebar, and nuts that fasten and fix the concrete part to be removed by screwing with these screws to the pile body part,
An outer shell steel pipe provided on the outer peripheral surface of the pile body,
A method of revealing the reinforcing steel of the outer steel pipe concrete composite pile, which has a concrete exposed part without the outer steel pipe formed on the outer peripheral surface of the concrete part to be removed,
Release the tightening fixation with the nut,
Lift the concrete part to be removed,
Pull out the concrete part to be removed separated from the pile body part from the axial rebar,
A method for revealing the reinforcement of a steel pile concrete composite pile, characterized by revealing the axial rebar.

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