JP2016180267A - Pile cage and holding member thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adopt screw reinforcements as main reinforcements of a pile cage and to thereby enable two main reinforcements of the pile cage to be coupled by a screw joint.SOLUTION: A main reinforcement 11 of a pile cage 10 is constituted of a screw reinforcement having a male screw part 11b. The main reinforcement 11 and an annular reinforcement frame 13 are joined and held together with a holding member 30. The holding member 30 includes joint parts 32 to be joined to the reinforcement frame 13 and a holding part 31. The holding part 31 is formed with an insertion hole 31a and an insertion opening part 31c. On the inner periphery of the insertion hole 31a, a female screw part 33 is formed which can be loosely screwed with the male screw part 11b. The main reinforcement 11 can be removed from or inserted in the insertion hole 31a through the insertion opening part 31c, and within a range of allowance in a state of being screwed in the insertion hole 31a, can be axially displaced without being rotated, and can be axially rotated without being axially displaced.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pile reinforcing bar rod to be a reinforcing bar assembly of a pile, and a holding member that holds and connects the main reinforcing bar to a reinforcing bar, and particularly relates to a pile reinforcing bar rod and a holding member to which a screw reinforcing bar is applied as a main reinforcing rod.

  This type of pile reinforcing bar is constituted by arranging a plurality of vertical main bars in an annular manner spaced from each other in the circumferential direction of a horizontal annular reinforcing frame (stress). The main bar is held by the reinforcing frame, and the entire shape of the pile reinforcement bar is held in a cylindrical shape (see Patent Document 1). Generally, the reinforcing frame is formed in an annular shape by curving an angle member having an L-shaped cross section along the longitudinal direction. The main bars are attached to the outer peripheral surface of the reinforcing frame, and the main bars are fastened to the reinforcing frame with U-shaped bolts. Further, a hoop line is wound around the plurality of main bars. The hoop bars and the main bars are connected by welding, for example. Therefore, the main bar, the reinforcing frame, and the hoop bar are rigidly coupled so as not to move relative to each other.

  When connecting two pile reinforcement rods in the vertical direction, for example, the ends of the main reinforcements of these pile reinforcement rods are overlapped by the required length (for example, about 2 m) and joined by wire binding or welding. doing.

JP2013-122121A

  In the conventional structure described above, the substantial length of each pile rebar is shortened by the amount of overlap between the ends of the main bars of the two pile rebars, and the length of the main rebar is wasted. It is also conceivable to connect the main bars of the two pile reinforcing bar rods with a cylindrical threaded joint by configuring the main bars with screw bars. In this case, it is necessary that the screw threads of the two main bars to be connected are arranged on a common spiral line. However, as described above, in the conventional structure, the main bars of each pile reinforcement bar, the reinforcing frame, and the hoop bars cannot move relative to each other, so that it is not easy to adjust the positions of the main bars of the two pile reinforcement bars. It was. Therefore, it is difficult to connect with a screw joint.

  In view of the above circumstances, an object of the present invention is to employ a screw reinforcing bar as a main reinforcing bar of a pile reinforcing bar so that the main reinforcing bars of the two reinforcing bars can be reliably connected by a screw joint.

In order to solve the above-mentioned problems,
A main rebar consisting of a screw rebar with a male thread,
An annular reinforcing frame intersecting with the main reinforcement;
A holding member for holding the main bar in a row with the reinforcing frame;
The holding member includes a connecting portion with the reinforcing frame, and the holding portion,
An insertion hole is formed in the holding portion, an insertion opening is formed on one side in the circumferential direction of the insertion hole, and the inner periphery of the insertion hole is screwed with play with the male screw portion. Possible female screw part is formed,
The main bar can be inserted into and removed from the insertion hole from the insertion opening, and can be displaced in the axial direction without rotating within the range of the play in the threaded state in the insertion hole, and is displaced in the axial direction. It is characterized by being able to rotate around the axis without any problems.

Further, the present invention is a holding member for holding a main reinforcing bar composed of a screw reinforcing bar having a male screw part in a pile reinforcing bar, connected to an annular reinforcing frame intersecting with the main reinforcing bar,
Including a connecting portion with the reinforcing frame, and the holding portion;
An insertion hole is formed in the holding portion, an insertion opening is formed on one side in the circumferential direction of the insertion hole, and the inner periphery of the insertion hole is screwed with play with the male screw portion. Possible female screw part is formed,
The main bar can be inserted into and removed from the insertion hole from the insertion opening, and can be displaced in the axial direction without being rotated, and can be displaced in the axial direction, within the play range in the threaded state in the insertion hole. It is characterized in that it is held so as to be rotatable around the axis without any problems.

  According to the pile reinforcing bar rod, by rotating the main bar relatively in the axial direction within the range of the play or rotating around the axis line, the main bar thread and other pile bars to be connected. The main thread threads of the heel can be arranged on a common spiral line. As a result, these main bars can be reliably connected to each other by the threaded joint. Further, the axial displacement of the main muscle can be regulated within the range of play by the hook between the male screw of the main muscle and the female thread of the holding member. Therefore, when the pile reinforcing bar is suspended with the first side in the axial direction facing up and the second side facing down, the main bar can be supported by a reinforcing frame or the like via the holding member. , Can prevent the main bars from falling.

  It is preferable that the female thread of the female thread part has a triangular cross section. Generally, the male thread of the main muscle has a trapezoidal cross section. As a result, the width of the female thread can be made smaller than that of the male thread, and play can be reliably formed between these threads.

  It is preferable that the holding portion is disposed on a radially outer side of the reinforcing frame, and the insertion opening is opened on the opposite side to the reinforcing frame in the circumferential direction of the insertion hole. Thus, after attaching the holding member to the reinforcing frame, the main bars can be fitted into the holding portion of the holding member from the outside in the radial direction of the reinforcing frame. By winding a hoop muscle outside the main muscle, it is possible to prevent the main muscle from coming out of the holding portion.

  The holding portion may be disposed on the radially outer side of the reinforcing frame, and the insertion opening may be opened on the reinforcing frame side in the circumferential direction of the insertion hole. As a result, the main bar is attached to the reinforcing frame from the outer side in the radial direction of the reinforcing frame after the main bar is addressed to the reinforcing frame from the outer side in the radial direction of the reinforcing frame or in parallel with the main bar. The main muscles can be fitted. The main bar can be held between the holding portion and the reinforcing frame. Therefore, it is possible to prevent the main bar from coming out of the holding part before winding the hoop line.

  According to the present invention, a screw rebar is adopted as the main reinforcing bar of the pile reinforcing bar, and the main reinforcing bars of the two pile reinforcing bars can be connected to each other by the screw joint.

FIG. 1 is a front view of a pile reinforcement bar according to the first embodiment of the present invention. FIG. 2 is a cross-sectional plan view of the above-described pile reinforcing bar along the line II-II in FIG. FIG. 3 is a front cross-sectional view of a portion of the above-mentioned pile reinforcement bar along the line III-III in FIG. FIG. 4 is a plan cross-sectional view of a part of the above-described pile reinforcing bar along the line IV-IV in FIG. 3. Fig.5 (a) is the front view which looked at the holding member of the said pile reinforcement rod from the insertion side (opposite side to a reinforcement frame) of the main reinforcement. FIG. 2B is a perspective view of the holding member. Fig.6 (a) is a top view which decomposes | disassembles and shows the said main reinforcement and a holding member. FIG. 4B is a plan view showing an initial state in which the main bar is inserted into the holding member. FIG. 4C is a plan view showing a state in which the main bar is turned about 90 degrees after being inserted into the holding member. Fig.7 (a) is side surface sectional drawing which shows meshing | engagement of the said main reinforcement and a holding member in alignment with the VII-VII line of FIG. FIG. 7B is a side sectional view showing a state in which the male thread of the main muscle is hooked on the female thread of the holding member in FIG. FIG. 8 is an enlarged front view showing the circular part VIII of FIG. Fig. 9 shows the construction procedure of the pile, and Fig. 9 (a) is a front cross-sectional view showing the state in which the pile rebar assembly is built in the pile hole of the ground in a state where the pile rebar rod is added to the assembly work in progress. is there. FIG. 4B is a front cross-sectional view showing a state where the assembled work body after the addition is lowered by the height of one pile reinforcing bar and inserted into the pile hole. FIG. 10 is a front sectional view of the pile. FIG. 11 is a plan sectional view of a part of a pile reinforcing bar rod according to the second embodiment of the present invention. FIG. 12 shows the holding member of the second embodiment, and FIG. 12 (a) is a front view of the holding member as seen from the insertion side (reinforcing frame side) of the main reinforcement. FIG. 2B is a perspective view of the holding member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 10 show a first embodiment of the present invention. As shown in FIG. 10, the pile 1 is constructed on the ground 2. A pile hole 2 a is formed in the ground 2. The pile 1 is embedded in the pile hole 2a. The pile 1 includes a pile rebar assembly 3 and concrete 4. The pile reinforcement assembly 3 is composed of a plurality of pile reinforcement rods 10, 10,. These pile reinforcement rods 10, 10... Are vertically arranged in a row.

  1 and 2 show each pile rebar rod 10 before being incorporated into the pile rebar assembly 3. Each pile reinforcing bar 10 includes a plurality of main bars 11, hoop bars 12, and a reinforcing frame 13. The overall shape of the pile reinforcement bar 10 is a substantially cylindrical shape.

As shown in FIG.3 and FIG.7, the main reinforcement 11 is comprised with the screw reinforcement which has the external thread part 11b. As shown in FIG. 6A, the cross section of the main bar ₁₁ is a substantially oval shape having a major axis L _11L and a minor axis L _11S . Male screw portions 11b are formed on the outer peripheral portions on both sides of the major bar 11 in the major axis direction. The male screw portion 11b includes a helical male screw thread 11d and a male screw valley portion 11e. As shown in FIG. 7, the cross-sectional shape of the male screw thread 11d is substantially trapezoidal. As shown to Fig.6 (a), the outer peripheral part of the both sides of the minor axis direction of the main reinforcement 11 becomes the flat plane part 11c.

  The axial length of each main reinforcement 11 and by extension, the height (length) of the pile reinforcement bar 10 is about 12 m, for example. As shown in FIG. 1, the axes of the main bars 11, 11,... Are parallel to each other and are directed vertically (up and down in FIG. 1). As shown in FIG. 2, the plurality of main bars 11, 11... Are arranged in an annular shape with a space between each other in the circumferential direction of the pile reinforcing bar rod 10 (the circumferential direction of the reinforcing frame 13). A hoop muscle 12 is wound around these main muscles 11, 11. The main muscles 11 and the hoop muscles 12 are tied together. The main muscle 11 can be displaced in the axial direction (vertical) with respect to the hoop muscle 12 and can rotate about its own axis.

  As shown in FIGS. 1 and 2, the pile reinforcing bar 10 is provided with a plurality of (preferably three or more) reinforcing frames 13, 13. Each reinforcing frame 13 has an annular shape (annular shape) orthogonal to (intersects) the main reinforcement 11. A plurality of reinforcing frames 13, 13... Are arranged apart from each other in the vertical direction (the axial direction of the pile reinforcing bar 10). A plurality of main bars 11, 11... Are held by these reinforcing frames 13. As a result, the whole shape of the pile reinforcement bar 10 is hold | maintained at the cylindrical shape.

The reinforcing frame 13 is constituted by a reinforcing bar 13X. As the reinforcing bar 13X, a general deformed reinforcing bar is used, but a screw reinforcing bar may be used. This reinforcing bar 13X is curved so as to form a closed annular shape along the longitudinal direction. Both ends of the reinforcing bar 13X are abutted and connected. For example, upset butt welding is applied as a joining means between both ends of the reinforcing bar 13X.
Note that both ends of the reinforcing bar 13X may be overlapped by a required length and joined by flare welding or the like.

As shown in FIG. 2, the plurality of main bars 11, 11... In the pile reinforcing bar 10 are respectively directed to the reinforcing frame 13 from the outside in the radial direction of the reinforcing frame 13. Of the reinforcing frames 13, 13... In the upper and lower stages of the pile reinforcing bar 10, the uppermost reinforcing frame 13 and each main reinforcing bar 11 are connected by a holding member 30. Although detailed illustration is omitted, the reinforcing frame 13 other than the uppermost stage and the main reinforcing bars 11 are tied together with a number wire. A part of the main bars 11, 11... Is also connected to the reinforcing frame 13 other than the uppermost stage by the holding member 30, and the other main bars 11, 11,. The main bars 11, 11... May be all connected to the reinforcing frame 13 other than the uppermost stage by the holding member 30.
Hereinafter, unless otherwise specified, the reinforcing frame 13 refers to the uppermost one in the pile reinforcing bar 10.

  As shown in FIG. 2, a plurality of holding members 30, 30. These holding members 30, 30... Are arranged at intervals in the circumferential direction of the reinforcing frame 13. The holding members 30, 30... Correspond to the main bars 11, 11. Each holding member 30 connects and holds the corresponding main reinforcement 11 to the reinforcing frame 13.

  As shown in FIGS. 4 and 5, the holding member 30 integrally includes a holding portion 31 and a pair of connecting portions 32 and 32. The holding member 30 is a cast product made of a metal such as steel or iron, but is not limited to casting, and may be a cut product. The holding part 31 has a half nut shape. That is, the holding portion 31 has an insertion hole 31a and an insertion opening 31c, and has a C-shaped (semi-annular) cylindrical shape in plan view, and a female screw portion 33 is formed on the inner peripheral surface of the insertion hole 31a. Is formed. The male screw part 11b of the main bar 11 and the female screw part 33 of the holding part 31 can be screwed together.

The axis of the insertion hole 31a is oriented vertically. A side portion of the insertion hole 31a is opened to the side opposite to the reinforcing frame 13 (front side in FIG. 5A), and an insertion opening portion 31c is formed there. As shown in FIG. 6A, the opening width W _31c of the insertion opening _31c is smaller than the major axis L _11L of the cross section of the main muscle 11 and larger than the minor axis L _11S (L _11S <W _31C <L _11L ).

As shown in FIG. 7, the female thread portion 33 has a female thread 33d and a thread valley 33e. The cross section of the female thread 33d has a triangular shape. As a result, the width W _33d of the female thread _33d is reduced. Specifically, the width W _33d of the female screw thread _33d is sufficiently smaller than the pitch P _11b of the male screw part 11b of the main muscle 11 even at the maximum bottom part (part connected to the screw valley 33e) (W _33d <P _11b), preferably less than half the pitch _{P 11b (W 33d <(P} 11b / 2)). The maximum width W 33d of the female thread _33d is smaller than the width W _{33e of the} thread valley 33e (W _33d <W _33e ).
The sum of the maximum width W 33d of the female thread _33d and the width W _33e of the thread valley 33e is the pitch P ₃₃ of the female thread portion 33 (P ₃₃ = W _33d + W _33e ). The pitches P _11b and P ₃₃ between the screw parts 11b and 33 are equal to each other (P _11b = P ₃₃ ).

  As shown in FIG. 5A, a pair of connecting parts 32, 32 are provided on the left and right sides of the holding part 31. The connecting portion 32 protrudes leftward and rightward along the tangential direction of the reinforcing frame 13 from the side portion of the holding portion 31 facing the reinforcing frame 13 (the back side portion in FIG. 5A). Each connecting portion 32 includes a pair of upper and lower connecting seats 32a and 32a. These coupling seats 32 a and 32 a have a disk shape substantially orthogonal to the radial direction of the reinforcing frame 13. An insertion hole 32c is formed in each coupling seat 32a.

  As shown in FIG. 4, the holding member 30 is addressed to the reinforcing frame 13 from the radially outer side of the reinforcing frame 13. The holding member 30 is connected to the reinforcement frame 13 by a pair of U-shaped bolts 34, 34. The U-shaped bolt 34 is attached to the holding member 30 from the inside in the radial direction of the reinforcing frame 13. As shown in FIG. 3, the entire circumference of the cross section of the reinforcing frame 13 is surrounded by the U-shaped bolt 34 and the connecting portion 32. A semicircular portion 34 c of the U-shaped bolt 34 is fitted into a radially inner half portion of the reinforcing frame 13. A pair of bolt portions 34a, 34a of each U-bolt 34 sandwich the reinforcing frame 13 from above and below. The tip portions of the bolt portions 34 a and 34 a are respectively passed through the insertion holes 32 c and are fastened to the connecting portion 32 by the nut 35.

As shown in FIGS. 6A and 6B, the main muscle 11 is inserted into the insertion hole 31a through the insertion opening 31c. The main member 11 is held by the holding member 30 so as to be displaceable in the axial direction and rotatable about its own axis. As shown in FIG. 6A, when the main muscle 11 is fitted into the holding part 31, the minor axis of the main muscle 11 is directed in the width direction of the insertion opening 31c, and the main muscle 11 is inserted from the insertion opening 31c into the insertion hole 31a. Insert into. As shown in FIG. 7A, at this time, the male screw portion 11b of the main muscle 11 and the female screw portion 33 of the holding member 30 are screwed together. As shown in FIG. 6 (b), when the main muscle 11 is inserted to the back of the insertion hole 31a, the main muscle 11 is then rotated about its axis about 90 degrees as shown in FIG. 6 (c). Thus, the major axis 11 is directed in the width direction of the insertion opening 31c, so that the main muscle 11 is prevented from coming out of the insertion opening 31c.
Note that the hoop muscle 12 is wound around the plurality of main muscles 11 and 11, so that the main muscle 11 is also prevented from coming out of the insertion opening insertion opening 31 c by the hoop muscle 12.

  As shown in FIG. 7, sufficient play (backlash) is set between the male screw portion 11 b of the main muscle 11 and the female screw portion 33 of the holding member 30. In particular, play (backlash) is set to be large by making the female thread 33d have a triangular cross section. Therefore, the main muscle 11 can slide and rotate with respect to the holding member 30 without depending on the screw action between the screw portions 11 b and 33. That is, the main muscle 11 can be displaced in the axial direction without rotating around the axis (non-rotating). In addition, the main muscle 11 can rotate around the axis without being displaced in the axial direction with respect to the holding member 30. As the main muscle 11 is slid or rotated, the male screw thread 11d eventually hits the female screw thread 33d as shown in FIG. 7B. As a result, sliding and rotation of the main muscle 11 independent of the screw action are restricted.

  As shown in FIG. 1, in each pile reinforcing bar 10, the upper end portion (first end portion) of the main reinforcement 11 protrudes upward (first side) from the holding member 30. A threaded joint 20 is attached to the upper end of the main bar 11.

  As shown in FIG. 8, the threaded joint 20 has a cylindrical shape, and its axis is oriented vertically. A female screw portion 22 is formed on the inner periphery of the screw joint 20. The cross section of the thread of the female screw portion 22 is trapezoidal. A play (backlash) is set in the axial direction between the internal thread portion 22 and the main muscle 11 before filling with the grout agent 5 described later. This play amount is sufficiently smaller than the play amount in the axial direction between the holding member 30 and the main muscle 11. As shown in FIG. 8, a grout hole 24 is formed in the threaded joint 20. The grout hole 24 penetrates from the outer peripheral surface of the screw joint 20 to the inner peripheral surface.

  As shown in FIG. 9 and FIG. 10, in the pile reinforcing bar assembly 3, the corresponding main bars 11 and 11 in two pile reinforcing bar rods 10 and 10 adjacent to each other are connected via a screw joint 20. . Here, when distinguishing the above-mentioned two pile reinforcing bar rods 10 and 10 from each other, the upper (first side) pile reinforcing rod rods 10 are marked with “A” and the lower (second side) piles. Reinforcing bar 10 is marked with “B”. Moreover, when distinguishing two main reinforcements 11 and 11 which should be connected in pile reinforcement bar 10A, 10B from each other, the code of main reinforcement 11 of pile reinforcement bar 10A is denoted as "11A", and main reinforcement 11 of pile reinforcement bar 10B is described. The code is expressed as “11B”. In addition, as shown in FIG. 9, pile reinforcing bar rods 10, 10... (Excluding pile reinforcing rod rods 10 A that have not been completed) are connected in a row in the pile reinforcing bar assembly 3 in the middle of construction. Called.

  As shown in FIG. 8, the threaded joint 20 straddles between the main bar 11A of the upper pile reinforcing bar rod 10A and the main bar 11B of the lower pile reinforcing bar rod 10B. The lower end portion of the main bar 11 </ b> A is screwed to the upper side portion of the screw joint 20. The upper end portion of the main bar 11 </ b> B is screwed to the lower side portion of the screw joint 20. A grout agent 5 is filled between the inner periphery of the threaded joint 20 and the main reinforcing bars 11A and 11B.

The construction method of the pile 1 is demonstrated centering on the construction method of the pile reinforcement assembly 3. FIG.
As shown in FIGS. 9 and 10, a pile hole 2 a is dug vertically in the ground 2. The pile hole 2a is filled with bentonite (not shown) to prevent the ground 2 from collapsing.
The pile rebar assembly 3 is built in the inside of this pile hole 2a in the following procedures.

  The pile reinforcement rods 10 are added to the assembly work piece 3x one by one above the pile hole 2a. Each time the joint is added, the assembly work piece 3x is inserted into the pile hole 2a by a certain depth.

  The hairpin 6 (hanging support member) is bridged over the upper end opening of the pile hole 2a. By this knurled line 6, the assembly work piece 3 x is supported in a suspended state. The hairpin 6 is made of, for example, a thick reinforcing bar. Preferably, the hairpin 6 is passed directly below the reinforcing frame 13 in the uppermost pile reinforcing bar 10 (10B) of the assembly work piece 3x. As a result, the load of the assembly work piece 3 x can be received by the reinforcing frame 13 and transmitted to the knurled muscle 6.

  In FIG. 9 (a), the barb 6 is inserted directly under the uppermost reinforcing frame 13 in the uppermost pile reinforcing bar 10B of the assembly work piece 3x, but in consideration of workability. Alternatively, the barb bars 6 may be inserted directly below the second-stage or third-stage reinforcing frame 13 from the top of the pile reinforcing bar 10B. By doing so, the height of the upper end part of the main reinforcement 11B of the pile reinforcement bar 10B can be positioned around the operator's waist. Therefore, it becomes easy to connect the main bars 11A and 11B described later.

  Subsequently, as shown in FIG. 9A, the pile reinforcing bar 10 </ b> A to be newly added is lifted by the crane 7. The suspension wire 7b of the crane 7 is preferably hooked on the reinforcing frame 13 of the pile reinforcing bar 10A.

  When the pile reinforcing bar 10A is lifted, each main reinforcing bar 11A of the pile reinforcing bar 10A tends to descend by its own weight. Then, as shown in FIG. 7B, the male thread 11 d of the main muscle 11 </ b> A is caught by the female thread 33 d of the holding member 30. Accordingly, the downward displacement (second side) of the main reinforcement 11A can be regulated, and the main reinforcement 11A can be suspended and supported by the holding member 30. As a result, the main muscle 11A can be prevented from falling. The load of the main reinforcement 11 </ b> A can be transmitted to the crane 7 through the holding member 30 and the reinforcing frame 13. As a result, the pile reinforcing bar 10A can be lifted stably.

  As shown to Fig.9 (a), this pile reinforcement rod 10A is arrange | positioned directly on the assembly work body 3x, and the two main reinforcements 11 and 11 which the pile reinforcement rods 10A and 10B should connect are on a mutually perpendicular straight line. To place.

Subsequently, as shown in FIG. 8, the screw joint 20 at the upper end of the main bar 11B is turned up to be straddled between the main bars 11A and 11B. At this time, using the play between the male screw portion 11b of the main muscle 11A and the female screw portion 33 of the holding member 30, the main muscle 11A is floated upward (displaced in the axial direction) or rotated around the axis. It adjusts so that the external thread part 11b of two main muscles 11A and 11B may be arrange | positioned on a mutually common spiral line.
By forming the female thread 33d in a triangular shape with a small width, play in the axial direction between the male screw portion 11b and the female screw portion 33 can be increased. Therefore, the position of the main muscle 11A can be adjusted sufficiently in the axial direction. Thereby, the upper end part of the screw joint 20 can be reliably screwed to the lower end part of the main reinforcement 11A. As a result, as shown in FIG. 8, the main bars 11 </ b> A and 11 </ b> B can be reliably connected via the screw joint 20.

  Next, the grout agent 5 is filled from the grout hole 24 between the inner periphery of the threaded joint 20 and the main bars 11A and 11B. As a result, rattling between the threaded joint 20 and the main bars 11A and 11B can be eliminated. Therefore, the main muscles 11A and 11B are connected to each other so as to transmit the axial force.

All the main reinforcing bars 11A, 11B forming a straight line in the two pile reinforcing bar rods 10A, 10B are connected as described above. Since each main muscle 11A can be displaced upward and can be rotated by the amount of play between the screw portions 11b33, if a pair of main muscles 11A and 11B are connected, the other main muscles 11A and 11B cannot be connected. There is no.
In this way, the pile reinforcing bar 10A can be added above the assembly work piece 3x.

  In addition, after adding main bars 11A and 11B, you may decide to remove holding member 30 of main bars 11B, and to use it for another pile reinforcement rod 10. By doing so, the required number of holding members 30 can be reduced.

  Subsequently, as shown in FIG. 9B, the knurled bar 6 is once pulled out and the assembly work body 3 x is suspended by the crane 7 by the height of one pile reinforcement bar 10. Then, the knurled bar 6 is suspended and supported by the knurled bar 6 by inserting the barb bar 6 into the uppermost pile bar bar 10 (the newly added pile bar bar 10A) of the assembled bar 3x.

By repeating the above operation, as shown in FIG. 10, the lowermost pile reinforcement rod 10 eventually reaches the bottom of the pile hole 2a. Thereby, the pile rebar assembly 3 can be constructed inside the pile hole 2a.
Thereafter, a concrete placement pipe (not shown) such as a tremy pipe is inserted into the pile rebar assembly 3 to place the concrete 4.
In this way, the pile 1 can be constructed.

According to the pile reinforcement assembly 3, it is not necessary to overlap the main reinforcements 11, 11 of the pile reinforcement rods 10A, 10B. Therefore, the length of the main muscle 11 can be used effectively.
By constructing the reinforcing frame 13 with the reinforcing bars 13X, it is possible to reduce the construction cost compared to constructing the angle member with an L-shaped cross section. In addition, in the reinforcing frame made of angle material, there is a possibility that an air pocket may be formed below the horizontal material of the angle material when placing concrete, but in the reinforcing frame 13 made of reinforcing bar 13X, The formation of air pockets can be prevented or suppressed.
By restricting the downward displacement of the main bar 11 with the holding member 30, the holding member 30 can be used as a restricting member. Therefore, the number of parts can be reduced and the construction cost can be reduced.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are attached to the drawings for the same configurations as those already described, and the description is simplified.
11 and 12 show a second embodiment of the present invention. As shown in FIG. 11, the holding member 30 </ b> B is disposed on the radially outer side of the reinforcing frame 13. The holding portion 31 of the holding member 30B is U-shaped or C-shaped in plan view, and an insertion hole 31a is formed inside. As shown to Fig.12 (a), the internal thread part 33 is formed in the internal peripheral surface of the penetration hole 31a. As shown in FIG. 12B, one side in the circumferential direction of the holding portion 31 is opened, and an insertion opening portion 31c is formed there. As shown in FIG. 11, the insertion opening 31 c is opened toward the reinforcing frame 13.

  The main muscle 11 is inserted into the insertion hole 31a from the insertion opening 31c. The male screw portion 11 b of the main muscle 11 is screwed with the female screw portion 33.

  A pair of connecting portions 32, 32 are provided at both ends of the holding portion 31 on the insertion opening 31 c side. These connecting portions 32, 32 are connected to the reinforcing frame 13 by U-shaped bolts 34 and nuts 35. The insertion opening 31c is closed by the bridge portion 13b between the pair of U-shaped bolts 34, 34 in the reinforcing frame 13, and the insertion hole 31a is closed. The main muscle 11 is surrounded by the holding portion 31 and the bridge portion 13b, and is held so as not to be able to be removed from the insertion opening portion 31c. As a result, the main muscle 11 cannot come out of the insertion opening 31 c without depending on the hoop muscle 12.

  In the second embodiment, after the main bar 11 is addressed to the reinforcing frame 13, or in parallel with the address, the holding portion 31 is fitted to the main bar 11. Then, the connecting portion 32 is connected to the reinforcing frame 13. Thereafter, the hoop muscle 12 is wound.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit thereof.
For example, the connecting portion 32 of the holding member 30 may be in the form of a hook that is detachably locked to the reinforcing frame 13.
As long as there is sufficient play between the male thread 11b of the main bar 11 and the female thread 33 of the holding member, the cross section of the female thread 33d is not limited to a triangular shape, and may be trapezoidal. .

  INDUSTRIAL APPLICABILITY The present invention can be applied to a pile reinforcing bar rod constituting a pile reinforcing bar assembly in a building / civil engineering structure.

DESCRIPTION OF SYMBOLS 10 Pile reinforcement bar 11 Main reinforcement 11b Male thread part 11d Male thread part 13 Reinforcement frame 30, 30B Holding member 31 Holding part 31a Insertion hole 31c Insertion opening part 32 Connection part 33 Female thread part 33d Female thread part

Claims (5)

A main rebar consisting of a screw rebar with a male thread,
An annular reinforcing frame intersecting with the main reinforcement;
A holding member for holding the main bar in a row with the reinforcing frame;
The holding member includes a connecting portion with the reinforcing frame, and the holding portion,
An insertion hole is formed in the holding portion, an insertion opening is formed on one side in the circumferential direction of the insertion hole, and the inner periphery of the insertion hole is screwed with play with the male screw portion. Possible female screw part is formed,
The main bar can be inserted into and removed from the insertion hole from the insertion opening, and can be displaced in the axial direction without rotating within the range of the play in the threaded state in the insertion hole, and is displaced in the axial direction. Pile reinforcement bar that can rotate around the axis without any problems.   The pile reinforcing bar according to claim 1, wherein the female screw thread of the female screw part has a triangular cross section.   The said holding | maintenance part is arrange | positioned at the radial direction outer side of the said reinforcement frame, and the said insertion opening part is opened on the opposite side to the said reinforcement frame in the circumferential direction of the said insertion hole. Or the pile reinforcement bar | burr of 2 description.   The said holding | maintenance part is arrange | positioned at the radial direction outer side of the said reinforcement frame, and the said insertion opening part is opened by the side of the said reinforcement frame in the circumferential direction of the said insertion hole. Pile reinforcement bar described in 1. A holding member for holding a main reinforcing bar consisting of a screw reinforcing bar having a male threaded portion in a pile reinforcing bar, connected to an annular reinforcing frame intersecting with the main reinforcing bar,
Including a connecting portion with the reinforcing frame, and the holding portion;
An insertion hole is formed in the holding portion, an insertion opening is formed on one side in the circumferential direction of the insertion hole, and the inner periphery of the insertion hole is screwed with play with the male screw portion. Possible female screw part is formed,
The main bar can be inserted into and removed from the insertion hole from the insertion opening, and can be displaced in the axial direction without being rotated, and can be displaced in the axial direction, within the play range in the threaded state in the insertion hole. A holding member for a pile reinforcing bar rod, characterized in that it is held so as to be rotatable around an axis without any problems.

Images