JP2019082103A - Reinforcement cage for vertical reinforcement fitting for reinforcement, and method for fitting vertical reinforcement for reinforcement using the reinforcement cage - Google Patents

Abstract

To provide a reinforcement cage which mounts a vertical reinforcement for reinforcement on a head of a columnar structure without welding, and a method for mounting the same.SOLUTION: A reinforcement cage 1 is constituted so that an upper end of an inversely L-shaped suspension vertical reinforcement 10 is restricted by a guide body 20, and an upper end thereof is restricted by a bottom side restraint body 30 such as a lower end hoop reinforcement 31. The guide body 20 of the reinforcement cage 1 has a double structure of inner and outer guide bodies 22 and 21 and forms an engagement mechanism that sandwiches and engages a vertical reinforcement 80 for reinforcement at an interval δ1 between the inner and outer guide bodies 22 and 21, a lower end of the vertical reinforcement 80 for reinforcement can be mounted on the hoop reinforcement 31, the vertical reinforcement 80 for reinforcement can be held by the guide body 20 and the bottom side restraint body 30 in an erected state in the reinforcement cage 1, thereby concrete is placed in a hollow space 6 of a columnar structure 5 in a state in which the vertical reinforcement 80 for reinforcement is held by the reinforcement cage 1 mounted in the hollow space 6, and thereby the vertical reinforcement 80 for reinforcement can be mounted on the columnar structure 5 without welding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for forming a columnar structure when connecting a head of a columnar structure such as a pile or a column and a reinforced concrete (RC) upper structure such as a foundation or a beam constructed on the head. The present invention relates to a reinforcing bar wedge used when attaching a reinforcing longitudinal bar such as a pile head reinforcing bar to a head, and a method of attaching the reinforcing longitudinal bar using the reinforcing bar stud.

  In foundation methods of houses, apartment buildings, and other structures, a pile foundation method that provides a pile that reaches a support layer etc. and forms the foundation on the head of this pile is a structure such as soft ground or liquefied ground Are widely used when constructing

  In such a pile foundation method, while forming a foundation part on a pile head, in order to unify a pile head and a foundation part, the work which connects a pile head and a footing which is a bottom plate of a foundation is performed It will be.

  The connection between the pile head and the foundation part is to attach a reinforcement vertical bar (pile head reinforcement bar) extending vertically upward to the pile head, and the pile head together with the pile head reinforcement in the footing of the foundation It is carried out by embedding a predetermined depth in.

  In the installation of such a pile head reinforcement, the external attachment method of welding and attaching the lower end of the pile head reinforcement to the outer periphery of the pile head and the lower end of the pile head reinforcement in the hollow space of the pile head There is a filling method in which it is buried and installed in the concrete to be placed.

  Among these, the external attachment method is to weld and attach the lower end of the pile head reinforcement to the outer periphery of the pile head, so the application object is limited to steel pipe piles and concrete piles with shell steel.

  In addition, although welding at field work is essential, it is difficult to secure a skilled welder due to a lack of labor in recent years, and in order to prevent the occurrence of insufficient strength due to the difference in the skills of welders, Such as the need to test by ultrasound, etc., causes the construction period to be prolonged.

  On the other hand, in the case of the above-mentioned filling method, as shown in FIG. 10, generally, vertical bars 110 made of deformed rebars or the like arranged at regular intervals in the circumferential direction and spiral hoops 160 for restraining the vertical bars 110 are After inserting the rebar 100 which is formed by welding in advance in the hollow space 106 of the head of the pile 105, by placing concrete in this hollow space 106, the vertical protruding upward from the pile head Reinforcement bar 110 is to be used as a pile head reinforcement bar to be embedded in the foundation footing together with the pile head (refer to Patent Documents 1 and 2). This eliminates the need for welding at construction sites and inspection of welded parts.

  On the other hand, it is necessary to attach the pile head reinforcement bars (longitudinal bars 110) attached to the pile head so as not to interfere with the arrangement bars (cross bars) in the foundation footing. Since the reinforcements are attached, it is easy to attach the pile head reinforcements at a position not interfering with the reinforcements on the basic footing side after the reinforcements are determined by marking out.

  On the other hand, when the pile head reinforcement bars are attached by the centering method using the reinforcement bars 100 described with reference to FIG. 10, part of the vertical bars 110 are arranged in the foundation footing by marking out, etc. Even if interference is found, it is not possible to avoid interference by moving only a part of the longitudinal muscle 110.

  As a result, when it is found that such interference is caused by marking out, for example, the reinforcement on the foundation footing side is shifted to a position not to interfere with the longitudinal reinforcement 110 of the reinforcing bar 100 or the pile head reinforcement 110 It is necessary to perform work called so-called "re-placement" by applying heat and mechanical external force to correct them.

  However, if the reinforcement on the side of the footing is changed, there may be a structural problem such as the inability to secure the required cover thickness after placing concrete, and the reinforcement of the pile head is also caused by the above reworking. If 110 is corrected, not only the cover thickness may not be secured in the same way, but also the required strength may not be ensured because the strength of the post reinforcements 110 after the correction is reduced due to heating and deformation. .

  Moreover, in any of the methods, the work to avoid interference is delayed until the work to avoid interference is completed, and subsequent work such as laying of foundation footings and placement of concrete stagnates, which will put pressure on the work period. .

  In order to be able to easily avoid the interference with the reinforcement of the foundation footing as described above, the inventors of the present invention make a part of the longitudinal bar which becomes the reinforcement of the pile head movable. As a weir, a reinforcing bar weir 200 shown in FIG. 11 has already been proposed (see Patent Document 3).

  The rebar 籠 200 shown in FIG. 11 comprises vertical rebars composed of a plurality of fixed longitudinal rebars 210 and a plurality of movable longitudinal rebars 220 consisting of threaded rebars, of which the fixed longitudinal rebar 210 is a spiral rebar 260 The lower end of the movable longitudinal bar 220 is screwed into a screw hole 281 provided in a slider 280 which can be moved with the lower end side hoop 231 as a guide rail while being restrained by welding to the intermediate hoop 230, and the screw hole 281 is penetrated By pressing the lower end portions of the movable vertical bars 220 onto the bottom plate 232, the movable vertical bars 220 can be attached to any position within the movable range of the slider 280.

Unexamined-Japanese-Patent No. 2002-212960 Unexamined-Japanese-Patent No. 08-333744 JP, 2011-140812, A

  In the reinforcing bar wedge 200 described in Patent Document 3 mentioned above, welding of the spiral streak 260 and the intermediate hoop 230 to the fixed longitudinal streak 210 is performed in advance in a factory etc., and the movable longitudinal streak 220 is screwed to the slider 280 Since it can be fixed at a desired position without welding, it can be attached to a pile head without performing welding work in the field, as described with reference to FIG. It is the same as rebar 100.

  Moreover, among the vertical bars that serve as pile head reinforcement bars, the movable vertical bars 220 have a variable attachment position, and it is found that the arrangement of the basic footing and the movable vertical bars 220 interfere with each other by marking out or the like. Even if there is any such interference can be avoided by moving the movable vertical bars 220, without changing the reinforcement of the basic footing, and also without repositioning the movable vertical bars 220, etc. Interference can be avoided.

  However, even in the case of using the rebar 200 of the above structure, since the fixed longitudinal bars 210 of the longitudinal bars are fixed in advance by welding, any of the fixed longitudinal bars 210 is a footing In the case of interference with the reinforcements, it is still necessary to change the reinforcements of the basic footing, or to rework a part of the fixed vertical reinforcement 210 or the like.

  In addition, since the fixed longitudinal bars 210 of the longitudinal bars are restrained by being welded to the spiral bars 260 and the intermediate hoop 230, the bending strength of the welded portion is reduced by the influence of heat at the time of welding Therefore, when a load is applied in the bending direction, it fractures relatively easily from the weld.

  Therefore, in order to compensate for such a reduction in strength, it is necessary to use thick reinforcing bars or increase the number of longitudinal bars, etc. As a result, the work of attaching pile head reinforcement bars becomes more complicated As the distance between the longitudinal bars is narrowed, interference between the pile head reinforcement and the reinforcement in the foundation footing is more likely to occur.

  Moreover, generally, high strength reinforcing bars have a large carbon equivalent, and when welding is performed to such a high carbon equivalent reinforcing bar, the heat-affected zone hardens due to rapid heat and rapid cooling during welding, and cracks occur.

  Therefore, it is not possible to adopt a high carbon equivalent reinforcing bar as the fixed longitudinal bar 210 welded to the spiral bar 260 or the intermediate hoop 230, and as a result, the pile head reinforcement bar by using a high strength bar It is difficult to reduce the diameter and reduce the number of units used.

  Moreover, in the reinforcing bar wedge 200 described in the above-mentioned Patent Document 3, the movable vertical bar 220 is movable and fixed because the movable vertical bar 220 is fixed by screwing on the slider 280 and pressing on the bottom plate 232. The complexity of the structure of (1) increases the manufacturing cost of the rebar 200.

  In the above description, although the case of joining the head of the pile and the footing footing has been described as an example, the joining performed by attaching a vertical reinforcement for reinforcement such as the above-mentioned pile head reinforcement is described above. Not only when joining between the pile head and foundation footing, but also when joining the head of the column to the beam constructed on it, etc., it is constructed on the head of the columnar structure and on it The problems described above are applied not only to the case where the pile head reinforcement is attached to the pile but also to the case where the reinforcement longitudinal bars are attached to the head of the column structure. It is a possible problem.

  Therefore, the present invention was made to solve the above-mentioned drawbacks of the prior art, and it is a relatively simple method, not only does not require welding in the field work, but also all of the reinforcing longitudinal bars. By providing a reinforcing bar wedge that enables installation by the filling method without welding, it is possible to easily install a reinforcing longitudinal bar that does not interfere with the bar arrangement in the upper structure such as the foundation, There is no reduction in strength due to rapid heat and rapid cooling at the time of welding in reinforcing vertical bars, and there are no restrictions on materials accompanying welding, so over-reinforcement bars due to reduction in diameter of reinforcing vertical bars and reduction in the number of attachments. The purpose is to make it possible to avoid the

  Hereinafter, means for solving the problems will be described together with reference numerals used in the mode for carrying out the invention. This code is for clarifying the correspondence between the description of the claims and the description of the mode for carrying out the invention, and it goes without saying that it is used restrictively for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, the rebar 1 of the present invention,
In order to connect the head of a pillar structure 5 such as a foundation pile and the upper structure of a reinforced concrete structure such as a footing constructed on the head of the pillar structure 5, the pillar structure 5 In rebar 1 used when attaching longitudinal reinforcement 80 such as pile head reinforcement to the head,
A plurality of inverted L-shaped suspension bars 10 each having a vertical portion 10a disposed vertically and a horizontal portion 10b projecting horizontally from the upper end of the vertical portion 10a;
An annular guide body 20 which restrains the upper end side of the suspended reinforcing bar 10 so that the horizontal portion 10b protrudes in the outer peripheral direction,
And a bottom side restraint body 30 such as a bottom hoop wire 31 and a bottom plate 32 for restraining a lower end side of the suspension reinforcing bar 10;
The horizontal portion 10b of the suspended reinforcing bar 10 is engaged with the opening edge 7 of the columnar structure 5, and can be inserted into the hollow space 6 formed in the head of the columnar structure 5 in a suspended state Has been
The guide body 20 is provided with a locking mechanism for locking the reinforcing longitudinal bar 80 so as to be movable to any position in the circumferential direction of the guide body 20,
The lower end of the reinforcing vertical bar 80 held by the guide body 20 is formed to be able to be placed on the bottom side restraint body 30;
The guide body 20 and the bottom side restraint body 30 are characterized in that they can hold the plurality of reinforcing vertical bars 80 in an upright state (Claim 1).

The guide body 20 is formed by an annular inner guide body 22 and an outer guide body 21 disposed on the outer peripheral side of the inner guide body 22 and having an inner peripheral shape similar to the outer peripheral shape of the inner guide body 22. ,
By setting the distance δ1 between the outer periphery of the inner guide body 22 and the inner periphery of the outer guide body 21 to be an interval at which the reinforcing vertical bars 80 can be held, any position in the circumferential direction of the guide body 20 can be obtained. The reinforcing vertical bar 80 may be inserted into the space δ1 and locked therein (see claims 2 and 1 to 4).

  In this case, the inner guide body 22 and / or the outer guide body 21 may be formed by an annularly bent band plate (claim 3, as an example in which the inner guide body is formed by a band plate) 4).

Further, the guide body 20 is formed by an annular guide rail 24 and a cylindrical coupler 25 into which the reinforcing longitudinal bar 80 can be inserted;
By attaching the coupler 25 to the guide rail 24 so that the coupler 25 can move in the circumferential direction on the guide rail 24 with the axial direction as the vertical direction, the coupler 25 can be placed at any position in the circumferential direction of the guide rail 24. The reinforcement longitudinal bar 80 may be inserted into and locked therein (see claims 4, 5 and 6).

Furthermore, while making the said reinforcement vertical bar 80 into a screw rebar,
The guide body 20 is formed by an annular inner guide body 22 and an outer guide body 21 disposed on the outer peripheral side of the inner guide body 22 and having an inner peripheral shape similar to the outer peripheral shape of the inner guide body 22. ,
The outer peripheral portion of the inner guide body 22 and / or the inner peripheral portion of the outer guide body 21 (the outer peripheral portion of the inner guide body 22 in the illustrated example) are formed of a soft metal 22c made of aluminum, copper, an alloy thereof or the like ,
The distance δ1 between the outer periphery of the inner guide body 22 and the inner periphery of the outer guide body 21 is greater than the two-face width W (the width between the span on which the spanner spans the jaw) W which is the reinforcing bar for reinforcement The locking mechanism may be formed so as to be wider than the diameter D (refer to claim 5, FIG. 5, and FIG. 6).

  Furthermore, the guide body 20 may be provided with a plurality of connection bars 23 protruding in the outer peripheral direction of the guide body 20, and the horizontal portions 10b of the suspension bars 10 may be attached to the connection bars 23 (claims) 6, see FIGS.

Moreover, the method of attaching the longitudinal reinforcement 80 of the present invention is
Inserting any of the above-mentioned reinforcing bars 1 into a hollow space 6 formed at the head of the columnar structure 5 in a suspended state;
A plurality of the reinforcing vertical bars 80 are inserted into the reinforcing bar weir 1, and the guide body 20 and the bottom side restraint body 30 do not weld the inserted plurality of reinforcing vertical bars 80 Keep standing upright in the rebar,
After the reinforcement arrangement position of the upper structure is determined, the reinforcement vertical reinforcement 80 held by the reinforcement reinforcement 1 is moved to a position which does not interfere with the arrangement of the upper construction, and then the reinforcement reinforcement 1 Concrete is placed in the hollow space 6 of the inserted pile head, and the lower end portion of the reinforcing longitudinal bar 80 held by the reinforcing bar is the hollow space of the columnar structure 5 together with the reinforcing bar 1 It is characterized in that it is buried in the concrete placed inside (see claims 7 and 9).

  The following remarkable effects can be obtained by attaching the reinforcing vertical bars 80 using the reinforcing bar wedge 1 of the present invention having the configuration described above.

  The rebar 1 according to the present invention comprises a suspended rebar 10, a guide body 20 for restraining the upper end side of the suspended rebar 10, and a bottom side restraining body 30 for restraining the lower end side of the suspended rebar 10; And a locking mechanism for locking the reinforcing vertical bar 80 movably at an arbitrary position in the circumferential direction, and the lower end of the reinforcing vertical bar 80 locked to the guide body 20 is the bottom side restraint body 30 can be placed on the support body 20 and the guide body 20 and the bottom side restraint body 30 can hold a plurality of reinforcing vertical bars 80 in an upright state, so that the reinforcing bar 籠 1 without welding or the like It is possible to hold the reinforcing longitudinal bars 80 in the reinforcing bar 1 only by inserting them inside.

  As a result, concrete is cast in the hollow space 6 while holding the reinforcing longitudinal bar 80 in the rebar 1 inserted in the hollow space 6 provided at the head of the columnar structure 5, In addition, by embedding the lower end portion of the reinforcement longitudinal bar 80 in the cast concrete, the reinforcement longitudinal bar 80 can be relatively easily attached to the head of the columnar structure 5.

  In addition, since the reinforcing vertical bars 80 can be moved in the circumferential direction of the guide body 20 before casting concrete, reinforcements of upper structures such as foundation footings are specified and interfere with these. When it became clear, by moving the reinforcing vertical bars 80 interfering before putting concrete in the circumferential direction of the guide body 20, the interference between both the bars could be easily avoided.

  In addition, since no welding is performed on all the reinforcing vertical bars 80, the strength of the reinforcing vertical bars 80 does not decrease due to the influence of heat at the time of welding, and no welding is necessary. However, it is possible to use a high-hardness reinforcing bar as a reinforcing longitudinal bar 80.

  As a result, the required strength can be secured even when the reinforcing vertical bars 80 are reduced in diameter and the number of reinforcing vertical bars 80 attached is reduced, and the distance between the reinforcing vertical bars 80 can be increased. By taking it widely, overpacked rebars can be avoided, interference with the rebars in the upper structure such as foundation footings is less likely to occur, and installation work of reinforcement vertical bars becomes easier. Was able to shorten the

  The guide body 20 is formed by the inner guide body 22 and the outer guide body 21 and can be locked by sandwiching the reinforcing vertical bar 80 between the outer periphery of the inner guide body 22 and the inner periphery of the outer guide body 21 In the configuration described above, the reinforcing vertical bars 80 can be placed at any positions only by inserting the reinforcing vertical bars 80 within the distance δ1 between the inner guide body 22 and the outer guide body 21 at any position in the circumferential direction of the guide body 20. It was possible to hold it, and it was possible to move the reinforcing longitudinal bars 80 along the interval δ1 as required.

  When the guide body 20 is constituted by the inner guide body 22 and the outer guide body 21 in this manner, one or both of them are formed by the annularly bent strip plate, whereby the inner guide body 22 and / or the outer guide It was possible to give the body 21 a property as a spring, and it was possible to preferably hold the reinforcing vertical bars 80 by the distance δ1 between the inner guide body 22 and the outer guide body 21.

  Further, in the example in which the guide body 20 is formed by the annular guide rail 24 and the coupler 25, after moving the coupler 25 to an appropriate position on the guide rail 24, the reinforcing longitudinal bar 80 is inserted into the coupler 25. Or by moving the coupler 25 into which the longitudinal reinforcing bar 80 is inserted to an appropriate position on the guide rail 24, the reinforcing longitudinal bar 80 can be moved to an appropriate position in the circumferential direction of the guide body 20 I was able to lock it.

  Furthermore, the reinforcing longitudinal bar 80 is a threaded reinforcing bar, and the guide body 20 is disposed on the outer peripheral side of the annular inner guide body 22 and the outer side of the inner guide body 22. A soft metal formed of an outer guide body 21 having an inner peripheral shape similar to the shape, and an outer peripheral portion of the inner guide body 22 and / or an inner peripheral portion of the outer guide body 21 is made of aluminum, copper, an alloy thereof or the like In the structure formed by 22c and using the locking mechanism of the longitudinal reinforcing bar 80, the screw which is the longitudinal reinforcing bar 80 is the distance δ1 between the outer periphery of the inner guide body 22 and the inner periphery of the outer guide body 21. By forming the reinforcing bars wider than the two-face width W, as shown in FIGS. 6 (A) and 6 (C), the flat surfaces 81 and 82 (surfaces on which the spanner's jaws are hung) of the threaded reinforcing bars which are the reinforcing vertical bars 80 Outer guide body 21 and inner guide By inserting the threaded rebar into the gap δ1 so as to face the guide body 22, the threaded rebar can be moved to any position in the circumferential direction of the guide body 20 (21, 22), and 21 and 22), by forming the spacing δ1 between the vertical lines 80 smaller than the diameter D of the reinforcing vertical bars 80, as shown in FIGS. By making the threaded section (thread) formed on the threaded rebar engage with the soft metal 22c provided on the guide body 20 (in the illustrated example, the inner guide body 22) by It was possible to fix (threaded rebar) between the outer and inner guide bodies 21 and 22 at any position in the circumferential direction.

  In the configuration in which the guide body 20 is provided with a plurality of connected reinforcing bars 23 projecting in the outer peripheral direction of the guide body 20 and the horizontal portion 10b of the suspended reinforcing bars 10 is attached to the connected reinforcing bars 23 by welding or the like. , The guide body is manufactured by manufacturing the multiple types of guide body 20 separately from the other parts and attaching the suspended reinforcing bars 10 to the main body portion of the reinforcing bar ridge which is formed by being restrained by the bottom side restraint body 30 or the hoop line 40 etc. It was possible to easily cope with the change of the thickness of the longitudinal reinforcing bars 80 to be attached, etc. by the selection of 20 types.

  Furthermore, in the configuration in which the bottom plate 32 covering the bottom of the reinforcing bar wedge 1 is the bottom side restraint body 30, when the bottom plate 32 is provided on the reinforcing bar wedge 1, the lower end hoop wire that becomes the bottom side restraint body 30 separately from the bottom plate 32 31 and the angle member 33 could be omitted.

(A) of the rebar gauze of this invention of the state inserted in a pile is a top view, (B) is a BB sectional drawing of (A). (A) of another reinforcing bar wedge of the present invention in a state of being inserted into a pile is a plan view, (B) is a cross-sectional view taken along the line B-B of (A). (A) of the further reinforcement rod of this invention of the present invention in the state inserted in a pile is a top view, (B) is a BB sectional view of (A). (A) of the rebar gauze of this invention which shows the modification of a guide body is a top view, (B) is a BB principal part sectional view of (A). (A) of the rebar gauze of this invention which shows the modification of a guide body is a top view, (B) is a BB principal part sectional view of (A). (A), (B) is an enlarged explanatory view of the part enclosed by 中 in FIG. 5 (A), (C), (D) an enlarged explanatory view of the part enclosed by 〇 in FIG. 5 (B). (A) is a plan view of a reinforcing bar of the present invention showing another modified example of the guide body, (B) is a cross-sectional view of a main part of the B-B line of (A), (C) is C-C of (A) Line expanded sectional view. (A) is a perspective view, (B) is an explanatory view of a method of attaching a connecting reinforcing bar to a guide rail, and (C) to (E) are shown as modifications in (A). Side exploded view, front view, and plan view of each connected rebar. It is explanatory drawing of the attachment method of the pile-head reinforcement bar using the reinforcement rod of this invention, (A) is a state which slip-stop welding completed, (B) is a state which inserts reinforcement rebar to a pile head, C) the state where the insertion of the reinforcing bar is completed to the pile head, (D) the state where the pile head reinforcement bar (reinforcement longitudinal bar) is attached to the reinforcement bar, (E) the pile head reinforcement bar (reinforcement) The movement state for avoiding the interference between the longitudinal bars) and the reinforcement of the foundation footing, (F) shows the state fixed by the placement of concrete. Explanatory drawing of the attachment method of the pile-head reinforcement by the conventional packing method (corresponding | compatible to patent document 1, 2). Explanatory drawing of the attachment method of the pile-head reinforcement by the conventional packing method (corresponding | compatible to patent document 3).

  Next, embodiments of the present invention will be described below with reference to the attached drawings.

  In the following description, the installation of the reinforcing longitudinal bar 80 using the reinforcing bar wedge 1 of the present invention is taken as an example in the case of attaching the reinforcing longitudinal bar (pile head reinforcing bar) 80 to the head of the foundation pile Although mentioned and explained, the reinforcing bar 籠 1 of the present invention is not limited to this example, and like the pillar of a building and the reinforced concrete beam placed on this pillar, It is widely applicable to the connection between the head and the reinforced concrete structure built on top of it.

  As shown in FIG. 1, the reinforcing rod cage 1 of the present invention restrains the upper end side of the inverted L-shaped suspended reinforcing rod 10 by the annular guide body 20, and the lower end side of the suspended reinforcing rod 10 is the lower hoop wire 31 etc. When the pile head reinforcement bar 80 is attached to the head of the column structure 5, the horizontal portion 10b of the suspension reinforcing bar 10 is a pile head. It is inserted into the hollow space 6 until it engages with the opening edge 7 of the and is housed and used in a suspended state in the hollow space 6.

  The above-described suspension bar 10 is formed in an inverted L shape including a vertical portion 10a disposed in the vertical direction when attached to the pile head and a horizontal portion 10b projecting horizontally from the upper end of the vertical portion 10a. The upper end portion side of the hanging reinforcing bar 10 is fixed to the guide body 20 so as to be fixed so that the horizontal portion 10b protrudes toward the outer peripheral direction, and the lower end portion is shown in FIG. In the example, the lower end hoop 31 is attached and restrained in the circumferential direction at a predetermined interval.

  In the embodiment shown in FIG. 1, although the above-mentioned suspension rebar 10 is formed by bending one rebar, the vertical portion 10a and the horizontal portion 10b are integrally formed, the suspension rebar 10 is shown in FIG. As shown, a straight reinforcing bar forming the vertical portion 10a and an L-shaped reinforcing bar forming the horizontal portion 10b may be separately formed, and these may be connected by welding or the like, and vertical The portion 10a and the horizontal portion 10b need not necessarily be directly connected, but may be connected via another member [for example, the guide body 20, the connection reinforcing bar 23 of the guide body 20 in the example shown in FIG. 5A]. It may be.

  In the embodiment shown in FIG. 1, when the pile head reinforcement bar 80 is inserted at a predetermined position in the reinforcing bar 籠 1, the lower end portion of the pile head reinforcement bar 80 may be placed on the lower end hoop wire 31. In the embodiment shown in FIG. 1, the lower end hoop reinforcement 31 restrains the lower end side of the suspension rebar 10 and mounts the lower end of the pile head reinforcement 80 in the embodiment shown in FIG. Double as the bottom side restraint body 30 of

  Although the example shown in FIG. 1 shows an example in which the lower end portion of the pile head reinforcement bar 80 is placed on the lower end side hoop bar 31 which is a reinforcing bar bent annularly, this configuration is replaced with FIG. As shown in B), a lower end side hoop plate 31 'formed of an annular plate may be provided, and a lower end of the pile head reinforcement bar 80 may be placed on the lower end side hoop plate 31'. The lower ends of the ridges 80 may be placed on the bottom plate 32, and the configuration of placing the lower ends of the pile head reinforcing bars 80 is not limited to the illustrated configuration.

  The above-mentioned guide body 20 restrains the upper end side of the suspended reinforcing bar 10 so that the horizontal portion 10 b protrudes in the outer peripheral direction, and is formed in an annular shape as a whole, and in the circumferential direction of the guide body 20 A locking mechanism is provided for locking the reinforcing longitudinal bar 80 so as to be movable to any position.

  In the embodiment shown in FIG. 1, the above-mentioned guide body 20 has an inner side guide body 22 and an inner periphery shape similar to the outer periphery shape of the inner guide body 22 disposed on the outer periphery side of the inner guide body 22. The outer guide body 21 has an outer guide body 21. The outer guide body 21 and the inner guide body 22 are connected to each other, and a connecting rebar 23 for attaching the horizontal portion 10b of the suspension bar 10 is provided.

  In the embodiment shown in FIG. 1 (A), the connecting rebar 23 is formed of cross bars in plan view, and the outer guide 21 and the inner guide 22 are arranged concentrically around the intersection 23a of the connecting rebar 23 At the same time, the upper end side of the suspended reinforcing bar 10 is guided by welding the portion of the linked reinforcing bar 23 that protrudes in the outer peripheral direction of the outer guide body 21 to the horizontal portion 10 b of the suspended reinforcing bar 10. It is mounted on the body 20 at predetermined circumferential intervals, in the illustrated embodiment at intervals of 90 °.

  However, the structure of the guide body 20 and the arrangement of the suspended reinforcing bars 10 are not limited to the configuration shown in FIG. 1A, for example, as shown in FIG. Alternatively, three hanging reinforcement bars 10 may be provided at equal intervals of 120 °, for example, by welding the hanging reinforcement bars 10 at each end of the connection reinforcing bars 23, or five or more suspension reinforcing bars 10 may be provided. It is good also as composition provided, and according to the size etc. of reinforcing bar ridge, the shape of connection reinforcement 23 provided in guide body 20 and the number of suspension reinforcements 10 to be used can be changed suitably.

  The example shown in FIG. 1 shows an example in which the inner guide body 22 is formed by bending in a ring shape, and the outer guide body 21 is formed by bending in an annular shape. Alternatively, the outer guide body 21 may be formed of an annular band steel plate or an inner guide body, contrary to the illustrated example. It is good also as what is constituted by annular reinforcement.

  As described above, the guide body 20 shown in FIG. 1 has an outer periphery of the inner guide body 22 and a locking mechanism for locking the reinforcing vertical bars 80 so as to be movable to any position in the circumferential direction of the guide body 20. , The space .delta.1 formed between the inner circumferences of the outer guide body 21 is formed to have a width substantially the same as the outer diameter of the pile head reinforcement bar 80 to be engaged, preferably slightly narrower than the outer diameter of the pile head reinforcement bar Therefore, when the pile head reinforcement bar 80 is inserted into the gap δ 1, the inner guide body 22 and / or the outer guide body 21 can be slightly deformed and held by holding the pile head reinforcement bar 80 In addition to the above configuration, the locking position can be moved along the interval δ1.

  In this case, when one or both of the outer and inner guide bodies 21 and 22 are formed by a band plate as described above, when the pile head reinforcement bar 80 is inserted into the gap δ1, the inner guide body 22 and / or Alternatively, the side of the outer guide body 21 formed by the band plate can be elastically deformed like a leaf spring, and thereby the pile head reinforcement bar 80 is held more reliably and locked at any position in the circumferential direction It may be possible to

  In addition, as a locking mechanism for locking the pile head reinforcement bar 80, as shown in FIGS. 5 and 6, the pile head reinforcement bar 80 is formed by a threaded reinforcing rod, and the inner peripheral portion of the outer guide body 21 and And / or the outer peripheral portion of the inner guide body 22 is formed of a soft metal 22c made of aluminum, copper, an alloy thereof or the like, the spacing .delta.1 between the outer and inner guide bodies 21 and 22 is A configuration in which the width W is larger than the width W between the two surfaces 81 and 82 provided as the surface to be hung, but smaller than the diameter D may be employed.

  By configuring in this manner, as shown in FIGS. 6A and 6C, the pile head reinforcement bar 80 is made such that its two faces 81 and 82 face the inner guide body 22 and the outer guide body 21. It is possible to move the pile head reinforcement bar 80 to any suitable position in the circumferential direction of the guide body 20 by inserting it into the gap δ1, while the pile head reinforcement bar at the position where the pile head reinforcement bar 80 is to be fixed When the 80 is rotated by 90 °, the soft joints (threads) provided on the pile head reinforcement bar 80, which is a threaded rebar, constitute the inner periphery of the outer guide body 21 and / or the outer peripheral portion of the inner guide body 22. By digging into the metal 22c, the pile head reinforcement bar 80 can be fixed at this position.

  In the embodiment shown in FIGS. 5 and 6, the configuration in which the outer peripheral portion of the inner guide body 22 is the above-described soft metal 22c is adopted, and in the illustrated example, two hoops 22a and 22b are vertically While welding at a predetermined interval, upper and lower two-stage welding, an aluminum bar is attached to the outer peripheral side of the hoop bars 22a and 22b so as to fit in the space between the hoop bars 22a and 22b. The outer peripheral portion of the inner guide body 22 is made of the soft metal 22c.

  In the embodiment described with reference to FIG. 1, the suspension rebar 10 is attached to the guide body 20 by attaching the horizontal portion 10 b of the suspension rebar 10 to the connection rebar 23 provided in the guide body 20. For example, as shown in FIG. 4, instead of this configuration, the upper end portion of the vertical portion 10a of the suspended reinforcing rod 10 is formed on the outer periphery or inner periphery (the outer periphery in FIG. 4) of the inner guide 22 formed by the annularly bent strip While attaching by a method such as welding, the outer guide body 21 formed of an annular reinforcing bar may be placed on the horizontal portion 10b of the suspended reinforcing bar 10 and welded, etc. In this configuration, the connecting rebar 23 described above is used. The guide body 20 can be configured without being provided.

  Furthermore, as the configuration of the aforementioned guide body 20, as shown in FIG. 7, it may be configured by an annular guide rail 24 and a cylindrical coupler 25 moving on the guide rail 24 in the circumferential direction. The pile head reinforcement bar 80 is inserted into the coupler 25 by forming the openings 26 of the 25 into a size that allows insertion of the pile head reinforcement bar 80, and the circumferential direction of the pile head reinforcement bar 80 is The above-mentioned locking mechanism is formed to be mounted at a predetermined position on the.

  The opening 26 of the coupler 25 may have a cut in the direction orthogonal to the axial direction of the coupler 25 as shown in FIG. 7 (C), but is shown by a dashed line in FIG. 7 (C). Thus, in order to facilitate the insertion of the pile head reinforcement bar 80, it may be formed as having an oblique cut.

  In the illustrated embodiment, the above-mentioned guide rail 24 is formed of an annularly bent band steel plate, and each end of the guide rail 24 in the width direction at both ends in the longitudinal direction of the coupler 25 The coupler 25 is attached to the guide rail 24 so as to be able to move on the guide rail 24 by providing locking claws 25a and 25b that are locked to the part.

  In the embodiment described with reference to FIG. 7, an example is shown in which the upper end portion of the vertical portion 10 a of the suspended reinforcement 10 is welded to the inner periphery of the guide rail 24 and the coupler 25 is attached to the outer periphery of the guide rail 24. However, contrary to this, the vertical portion 10a of the suspension bar 10 may be attached to the outer periphery of the guide rail and the coupler 25 may be attached to the inner peripheral side of the guide rail 24 Both the attachment of the reinforcing bar 10 and the attachment of the coupler 25 may be performed on the same side of the guide rail 24, and further, the coupler 25 may be attached to both the inner peripheral side and the outer peripheral side of the guide rail. It is not limited to the illustrated configuration.

  In the embodiment described with reference to FIG. 7, the vertical reinforcing bar 10 vertical portion 10a is directly welded to the guide rail 24. However, as shown in FIG. A connection rebar 23 may be provided for attaching the horizontal portion 10b of 10, and the connection rebar 23 may be fixed to the horizontal portion 10b of the suspension rebar 10.

  In the example shown in FIG. 8 (A), the reinforcing bars bent in an inverted L shape are attached to the guide rails 24 and used as the connecting rebars 23. However, when the reinforcing bar 1 becomes large, connecting at the time of attachment to the pile head When the load applied to the reinforcing bar 23 becomes large, as shown as “modification” in FIG. 8A, the reinforcing bar bent in a U-shape is bent at a predetermined position, attached to the guide rail 24 It is good also as what uses the connection rebar 23 'by which the vertical part and the horizontal part which protrude to the outer peripheral direction are respectively comprised by two each reinforcement.

  The vertical portion of the connection rebar 23 can be attached to the guide rail 24 by welding or the like. In this case, the vertical portion of the connection rebar 23 may be directly welded to the guide rail 24. When using the coupler 25 to be locked to the guide rail 24 by the locking claws 25a and 25b, as shown in FIG. 8B, the mounting base 24 'that fits in the interval between the locking claws 25a and 25b of the coupler 25 is used. By mounting the coupler 25, the movable claws 25a and 25b of the coupler 25 and the connecting rebar 23 do not interfere with each other, whereby the movable range of the coupler 25 can be expanded.

  Further, in the connection rebar of reference numeral 23 'shown as a modification, two angle members 27, 27 are erected in the vertical portion, and the locking rods 28b, 28c are respectively protruded from the upper and lower ends of the rectangular plate 28a. With the attachment 28 provided and the guide rail 24 disposed between the upper and lower angle members 27, 27, the upper locking bars 28b, 28b provided in the attachment 28 in the insertion holes 27a, 27a provided in the upper angle member 27 The lower locking rods 28c and 28c provided on the attachment 28 are inserted into insertion holes (not shown) provided on the lower angle member 27 after the insertion of the By screwing a bolt 29 into a bolt hole (not shown) provided on the side face of the guide rail 24 and pressing the side surface of the guide rail 24 with the tip of the bolt 29 And it is configured to be able to attach the binding rebar 23 '.

  As described above, the suspension rebar 10 whose upper end side is restrained by the guide body 20 by fixing the horizontal portion 10b directly to the guide body 20 or by fixing the horizontal portion 10b to the connected rebars 23 and 23 'provided on the guide body 20 The lower end side is restrained by the bottom side restraint body 30, and the lower end of the pile head reinforcement bar 80 can be placed on the bottom side restraint body 30.

  In the example shown in FIG. 1, the lower end side hoop reinforcement 31 for restraining the suspension reinforcement 10 from the outer peripheral side is attached at a position slightly above the lower end of the suspension reinforcement 10. The lower end can be placed, but as shown in FIG. 1 (B), in the configuration in which the bottom plate 32 is attached to the lower end of the suspension rebar to prevent falling of concrete at the time of putting concrete, The lower end of the pile head reinforcement bar 80 may be placed on the bottom plate 32 so that the bottom plate 32 has the function of the bottom side restraint body 30.

  The bottom of the rebar 1 according to the present invention does not necessarily have to be covered with the bottom plate 32, and separately from the rebar 1, when a bottom plate for receiving cast concrete is installed in a pile head or a hollow of the pile head If the space is bottomed, attach the bottom side restraint body 30 consisting of the angle member 33 on which the lower end portion of the pile head reinforcement bar 80 is placed at the lower end of the suspension rebar 10 as shown in FIG. 2 (B) The bottom of the rebar 1 may be open.

  In addition, as shown in FIG. 7 (B), the upper end side of the suspended reinforcing bar 10 is restrained by the guide body 20 and the lower end side by the bottom plate 32 which is the bottom side restraint body 30 as shown in FIG. Although it is good also as composition which does not have material, as shown in Drawing 1-Drawing 3, it is good also as what attaches hoop reinforcement 40 to a predetermined position in the height direction, and is reinforced to vertical part 10a of suspension reinforcement 10.

  In this case, all or part of hoop muscle 40 is made into a double structure consisting of outer hoop muscle 41 and inner hoop muscle 42, and pile head reinforcement muscle 80 can be received between outer hoop muscle 41 and inner hoop muscle 42. It may be configured to be able to hold the pile head reinforcement bar 80 more stably.

  Also, although the example shown in FIGS. 1 to 3 shows an example in which the vertical portion 10a of the suspension reinforcing bar 10 is restrained by the hoop bars 40, as described with reference to FIG. It is good also as what is restrained by a spiral spiral.

  The rebar 1 configured as described above continues until the horizontal portion 10b of the suspension rebar 10 is locked to the opening edge 7 of the pile head in the hollow space 6 formed in the pile head as shown in FIG. The pile head reinforcement bar 80 is projected from the head of the pile 5 by a predetermined length by placing concrete in a state where the pile head reinforcement bar 80 is attached to the rebar 1 inserted into the hollow space 6 while inserting It is configured to be able to be attached in the state of being allowed to move.

  The installation of the pile head reinforcement bar 80 using the rebar 1 of the present invention is either a pre-formed pile or a cast-in-place pile if the pile 5 has a hollow space 6 into which the rebar 1 can be inserted at the head. Is also applicable, and can be applied to any piles such as steel pipe piles (see Figs. 1 and 2), concrete piles (see Fig. 3), concrete piles with outer shell steel pipes (not shown), etc. Yes, when attaching a pile head reinforcement bar 80 using the rebar 1 of the present invention to a steel pipe pile or a concrete pile with an outer shell steel pipe, the pile head for the outer periphery of the pile head by the external method described in the prior art It is also possible to carry out attachment of reinforcing bars in combination.

  Moreover, in this embodiment, although the example of attachment of a pile head reinforcement bar to the column-shaped columnar structure 5 is demonstrated, in attachment of the reinforcement vertical bar 80 to the head of a column, a prismatic column etc., It can also be used to attach reinforcing longitudinal bars 80 to columnar structures other than cylindrical ones.

  In this case, according to the shape of the columnar structure to be attached, the reinforcing bar 籠 1 is changed to a shape corresponding to the shape of the target columnar structure 5 such as not only cylindrical but also prismatic as required. It is good also as a thing.

  The installation process of the pile head reinforcement bar 80 will be described with reference to FIG. 9. When the pile 5 to which the pile head reinforcement bar is to be attached is a steel pipe pile, it is bent at predetermined positions inside and outside the pile head When welding steel plates in the circumferential direction as anti-displacement 50, so-called "anti-displacement welding" [Fig. 9 (A)], and although not shown, when using a rebar 1 without a bottom plate, The bottom plate is attached at a predetermined height position in the hollow space 6 of the pile head as required.

  After that, the reinforcing bar wedge 1 of the present invention is inserted into the hollow space 6 of the pile head with the bottom side facing downward [Fig. 9 (B)], and the horizontal part 10b of the suspended reinforcing bar 10 is placed on the opening edge 7 of the pile head. The steel bar 1 is locked and accommodated in the hollow space 6 of the pile head in a suspended state [FIG. 9 (C)].

  The pile head reinforcement bar 80 is attached to the rebar 1 inserted in the pile head in this manner.

  If the guide body 20 of the reinforcing bar 1 is constituted by the outer guide body 21 and the inner guide body 22 as shown in FIGS. The reinforcement reinforcement 80 is inserted into the gap δ1 between the inner guide 22 and the inner guide 22 and the lower end of the reinforcement reinforcement 80 is fixed to the bottom side restraint 30 (lower hoop 31 in the example of FIGS. 2 in the example of FIG. 5 and the lower end side hoop plate 31 'in the example of FIG. 5, and in the example of FIG. Perform by rotating.

  In addition, when the guide body 20 is configured by the guide rail 24 and the coupler 25 (see FIG. 7), after moving the coupler 25 to a desired position on the guide rail 24, the pile head reinforcement bar 80 is assembled in the coupler 25. And the lower end of the pile head reinforcement bar 80 is placed on the bottom plate 32 which is the bottom side restraint body 30 (FIG. 9 (D)).

  Thus, the pile head reinforcement bar 80 attached to the rebar 1 is not fixed yet in the state before concrete is placed in the hollow space 6 of the pile head and can be freely moved. In the state.

  Therefore, when marking of the foundation footing specifies the position of the lateral rebars arranged in the footing, or when actually laying the foundation footing, reinforcements in the foundation footing are arranged. When a pile head reinforcement is present at a position where it interferes with the movement of the pile head, the pile head reinforcement 80 corresponding to the position for avoiding the interference is moved.

  In the example shown in FIG. 9 (E) as an example, the pile head reinforcement bars 80 at the A and F positions that interfere with the arrangement of the foundation footing in plan view are moved along the guide body 20 in the clockwise direction. Avoid interference [Fig. 9 (E)].

  After avoiding the interference in this manner, concrete is cast in the hollow space 6 of the pile head, and the lower end portion of the pile head reinforcement bar 80 held in the steel rebar 1 with the rebar 1 is hit. It is buried in the set concrete, and installation of the pile head reinforcement bar 80 is completed [FIG. 9 (F)].

  In this way, it is possible to attach the pile head reinforcement bar 80 which does not interfere with the arrangement in the foundation footing, without reviewing the reinforcement bars in the foundation footing or reworking the pile head reinforcement bars 80, etc. Workability is greatly improved, and since no welding is performed on the pile head reinforcement bar 80, rapid heat associated with welding and a decrease in bending strength of the pile head reinforcement bar 80 due to quenching also occur. Absent.

  In addition, welding becomes unnecessary, and even high-strength rebars with high carbon equivalent and not suitable for welding can be used as pile-head reinforcement bars 80, and small diameter reinforcement bars are used as pile-head reinforcement bars. As it is possible to reduce the use of construction and the number of attached reinforcements of the pile head, it is possible to avoid the overcrowded reinforcement and shorten the construction period, and it is possible to make the aforementioned interference less likely to occur. is there.

1 Rebar rod 5 Columnar structure (base pile)
6 hollow space 7 opening edge 10 suspended reinforcing bar 10a vertical part (for suspended reinforcing bar)
10b horizontal part (for suspended reinforcement)
Reference Signs List 20 guide body 21 outer guide body 22 inner guide body 22a, 22b hoop bar 22c soft metal 23, 23 'connection rebar 23a intersection point (for connection rebar 23)
24 guide rail 24 'mounting base 25 coupler 25a, 25b locking claw 26 opening (of coupler 25)
27 angle member 27a insertion hole 28 attachment 28a rectangular plate 28b locking bar (upper side)
28c Locking rod (lower side)
29 bolt 30 bottom side restraint body 31 lower end side hoop bar 31 'lower end side hoop plate 32 bottom plate 33 angle member 40 hoop bar 41 outer hoop bar 42 inner hoop bar 50 slip prevention 80 reinforcement vertical bar (pile head reinforcement bar)
81, 82 Plane 100 Reinforcing rod 105 Pile 106 Hollow space 110 Longitudinal bar (pile head reinforcement bar)
160 Spiral hoop 200 Reinforcement bar 210 Fixed vertical bar 220 Movable vertical bar 230 Middle hoop 231 Lower end side hoop 232 Bottom plate 260 Spiral bar 280 Slider 281 Screw hole

Claims (7)

When attaching a reinforcement longitudinal bar to the head of the columnar structure in order to connect the head of the columnar structure and the upper structure of the reinforced concrete structure constructed on the head of the columnar structure In the rebar we use,
A plurality of inverted L-shaped suspension bars having a vertical part arranged in the vertical direction and a horizontal part protruding in the horizontal direction from the upper end of the vertical part;
An annular guide body for restraining the upper end side of the suspended reinforcing bar so that the horizontal portion protrudes in the outer peripheral direction;
A bottom side restraint body for restraining a lower end side of the suspended reinforcing bar,
The horizontal portion of the suspended reinforcing bar is locked to the opening edge of the columnar structure, and can be inserted into the hollow space formed in the head of the columnar structure in a suspended state,
The guide body is provided with a locking mechanism for locking the reinforcing longitudinal bar so as to be movable to any position in the circumferential direction of the guide body,
The lower end of the reinforcing longitudinal bar held by the guide body is formed to be mountable on the bottom side restraint body,
A reinforcing rebar rod for reinforcing vertical bar attachment characterized in that a plurality of the reinforcing vertical bars can be held in an upright state by the guide body and the bottom side restraint body. The guide body is formed by an annular inner guide body and an outer guide body disposed on the outer peripheral side of the inner guide body and having an inner peripheral shape similar to the outer peripheral shape of the inner guide body;
By setting the distance between the outer periphery of the inner guide body and the inner periphery of the outer guide body to be an interval capable of holding the reinforcing vertical bar, the distance between the outer periphery of the inner guide body and the inner periphery of the outer guide body The reinforcing rod for reinforcing longitudinal bars according to claim 1, characterized in that the reinforcing longitudinal bars are inserted and locked.   The reinforcing rod for reinforcement longitudinal reinforcement according to claim 2, wherein the inner guide body and / or the outer guide body are formed by annularly bent strips. The guide body is formed by an annular guide rail and a cylindrical coupler into which the reinforcing longitudinal bar can be inserted;
By attaching the coupler to the guide rail so that the coupler can move in the circumferential direction on the guide rail with the axial direction up and down, the reinforcing member can be reinforced in the coupler at any position in the circumferential direction of the guide rail The reinforcing rod for reinforcing longitudinal bars according to claim 1, characterized in that the longitudinal bars are inserted for locking. While making the said reinforcement longitudinal bar into a screw rebar,
The guide body is formed by an annular inner guide body and an outer guide body disposed on the outer peripheral side of the inner guide body and having an inner peripheral shape similar to the outer peripheral shape of the inner guide body;
The outer peripheral portion of the inner guide body and / or the inner peripheral portion of the outer guide body are formed of soft metal,
The space between the outer periphery of the inner guide body and the inner periphery of the outer guide body is formed wider than the two-face width of the threaded reinforcing bar, which is the reinforcing longitudinal bar, and narrower than the diameter. Rebar rod for attachment of longitudinal bars as described.   The said guide body was provided with several connection rebar which protrudes in the outer peripheral direction of this guide body, The said horizontal part of the said suspension rebar was attached to this connection rebar, The said any one of Claims 1-5 characterized by the above-mentioned Rebar rod for installation of longitudinal bars for reinforcement. The reinforcing bar rod according to any one of claims 1 to 6 is inserted into a hollow space formed at the head of the columnar structure in a suspended state,
A plurality of the reinforcing vertical bars are inserted into the reinforcing bar, and the guide body and the bottom side restraint body do not weld the inserted plurality of reinforcing vertical bars in the reinforcing bar Keep it standing,
After the reinforcement arrangement position of the upper structure is determined, the reinforcing reinforcement held by the rebar arrangement is moved to a position not interfering with the arrangement arrangement position of the upper structure, and then the rebar arrangement is inserted. The concrete is placed in the hollow space of the pile head and the lower end of the reinforcing longitudinal bar held by the rebar is placed in the hollow space of the columnar structure together with the rebar. A method of attaching a reinforcing longitudinal bar, characterized by being buried in the inside.

Images