JP2010024775A - Reinforcement cage lifting method, reinforcement cage, and reinforcement cage assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load acting on a portion joined to an auxiliary member, when the reinforcement cage is erected. <P>SOLUTION: Vertical reinforcements 30 are prefixed to a plurality of steel plates 21 of a reinforcing member 20 which is composed of a vertical member 22 elongated in a vertical direction and the plurality of steel plates 21 attached to the vertical member 22 in such a manner as to be horizontally elongated at vertical spacings, respectively; and the reinforcement cage 10 is lifted via the vertical member 22 of the reinforcing member 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for lifting a reinforcing steel basket embedded in a reinforced concrete underground wall.

  Conventionally, as a method of constructing a reinforced concrete underground wall, there is a method in which the ground is cut into a rectangular cross section to form a hole, a reinforced cage is built in the hole, and concrete is placed in the hole. It is used.

  FIG. 9 is a perspective view showing a rebar cage 110 that is conventionally used when constructing an underground wall. The rebar cage 110 is composed of steel plates 121 and 122 assembled in a lattice pattern, and reinforcing members 120 arranged at intervals in the vertical direction, and vertical bars 30 welded to the reinforcing members 120 at intervals in the horizontal direction. And a horizontal bar 31 welded to the vertical bar 30 with an interval in the vertical direction. Such a rebar cage 120 is assembled by welding the vertical bars 30 and the steel plates 121 at the site where the vertical bars 30 and the horizontal bars 31 intersect.

However, since the operation of welding the vertical bars 30 and the horizontal bars 31 is easily affected by rain, it is necessary to stop the operation when it rains. Therefore, for example, Patent Document 1 describes a method of binding reinforcing bars with a linear binding member having elasticity as shown in FIG. By using such a binding member, it is not necessary to weld the vertical bars 30 and the horizontal bars 31 when they are joined.
Japanese Patent No. 3614798

  Here, since the welding operation is affected by the weather as described above, the steel plate 121 and the longitudinal bars 30 of the reinforcing member 120, like the binding member used when joining the longitudinal bars 30 and the transverse bars 31, It is desirable to join with a binding member that does not require welding. However, such a binding member cannot be used for the following reasons.

  That is, when the reinforcing bar 110 is built in the excavation hole, the reinforcing member 120 disposed above is lifted by the lifting device. For this reason, all the weights of the vertical bars 30 act on the joints between the steel plates 121 and the vertical bars 30 of the reinforcing member 120 disposed above. In particular, when a deep underground wall is constructed, a plurality of rebar cages 120 are connected and used. At this time, the rebar cages 120 are connected by joining the longitudinal bars 30 with a mechanical joint or the like. Therefore, a very large load is applied to the joint between the steel plate 121 and the longitudinal bars 30 of the uppermost reinforcing member 120. For this reason, sufficient binding strength cannot be obtained with the above-described binding member.

  The present invention has been made in view of the above problems, and an object thereof is to reduce a load acting on a joint portion between a reinforcing bar and an auxiliary member when a reinforcing bar cage is built.

The method for lifting a reinforcing steel basket according to the present invention includes a plurality of vertical bars extending in the vertical direction and spaced in the horizontal direction, and a plurality of horizontal bars attached to the plurality of vertical bars at intervals in the vertical direction. And a vertical member extending in the vertical direction, and a plurality of vertical members attached to the vertical member so as to extend in the horizontal direction with an interval in the vertical direction. A plurality of vertical bars are fixed to each horizontal member of a reinforcing member comprising a horizontal member, and the reinforcing bar cage is lifted through the reinforcing member.
In addition, the underground wall in this invention contains a wall pile.
Further, in the above-described method of lifting a reinforcing bar, the plurality of reinforcing bars connected vertically may be lifted while connecting the vertical members of the reinforcing bars adjacent vertically.

  Further, the horizontal member and the vertical bar may be fixed by a jig capable of restraining the horizontal member and the vertical bar, and further, the vertical bar and the horizontal bar are arranged so as to intersect with each other. The pair of reinforcing bars may be fixed by a jig capable of restraining them.

  The rebar cage according to the present invention includes a plurality of vertical bars extending in the vertical direction and arranged in horizontal intervals, and a plurality of horizontal bars extending in the vertical direction attached to the vertical bars. A plurality of vertical bars, each of which has a vertical member extending in the vertical direction, and extends in the horizontal direction with an interval in the vertical direction between opposing portions of the vertical member. It is fixed to each horizontal member of the reinforcement member which consists of a plurality of horizontal members attached in this way.

  In the above reinforcing bar cage, the horizontal member and the vertical bar may be fixed by a jig capable of restraining the horizontal member and the vertical bar, and the vertical bar and the horizontal bar cross each other. The pair of reinforcing bars arranged in the above may be fixed by a jig capable of restraining.

  The rebar cage assembling method of the present invention is a method for assembling a rebar cage embedded in the underground wall, in which a plurality of horizontal bars are arranged on the ground, and the horizontal bars are substantially above the horizontal bars. A plurality of vertical bars are attached so as to extend vertically, and a long vertical member and surfaces on both sides of the vertical member are spaced in the axial direction of the vertical member so as to be substantially perpendicular to the vertical member. A reinforcing member comprising a plurality of horizontal members attached so as to extend is arranged such that the vertical member and the vertical stripe are substantially parallel above the vertical stripe, and the horizontal member on one surface is in contact with the vertical stripe. Arranged in contact with each other, fixing the plurality of vertical bars to each horizontal member on the one side, and arranging the plurality of vertical bars substantially parallel to the vertical member above the horizontal member on the other side, The horizontal member on the other side and the plurality of vertical bars are fixed, and the front And wherein attaching the plurality of lateral stripes to extend substantially perpendicular to the plurality of vertical stripe fixed to the horizontal member of the other side.

  According to the present invention, since the vertical bars are fixed to the horizontal members attached to the pair of vertical members with a space therebetween in the vertical direction, the loads of the vertical bars are supported by the plurality of horizontal members. And the load acting on the joint of the longitudinal bars is reduced.

Hereinafter, an embodiment of a method for lifting a reinforcing bar car according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a reinforcing steel car 10 constituting an intermediate wall of a reinforced concrete structure to be lifted by the lifting method of the present embodiment. As shown in the figure, the reinforcing bar 10 of the present embodiment sandwiches a pair of plate-like vertical members 22 arranged to face each other in parallel with a predetermined interval in the horizontal direction, and the vertical members 22 sandwiched therebetween. In this way, the reinforcing member 20 is composed of a plurality of (two in the example of FIG. 1) steel plates 21 that are attached with a gap in the vertical direction, and the steel plates 21 that constitute the reinforcing member 20 are spaced horizontally. It consists of a plurality of vertical bars 30 that are attached in the vertical direction, and horizontal bars 31 that are attached to these vertical bars 30 at intervals in the vertical direction.

  2 is an enlarged perspective view of part A in FIG. 1, and FIG. 3 is an enlarged perspective view of part B in FIG. In each figure, (A) is a side view of a binding jig, (B) to (D) are views taken along arrows BD in (A), and (E) is a view showing the back surface of (A). It is. As shown in FIGS. 2 and 3, the vertical bars 30 and the steel plate 21 are joined by a binding jig 40. 2 is a binding jig 40 that joins the vertical bars 30 on one surface of the reinforcing steel basket 10 and the steel plate 21, and the binding jig 50 that joins the vertical bars 30 and the steel plate 21 on the other side shown in FIG. The binding jigs 40 and 50 having different shapes are used depending on the convenience of the process of assembling the rebar cage 10 described later. The binding jig 40 shown in FIG. 2 is a joint between the longitudinal bars 30 located above and the steel plate 21 when the rebar cage 10 is assembled with the front side in FIG. The binding jig 50 shown in FIG. 3 is used for the joint between the longitudinal bars 30 located below and the steel plate 21 when the rebar cage 10 is assembled in the laid state.

  As shown in FIG. 2, the binding jig 40 includes a first bent portion 41A formed by bending a steel bar having a spiral shape at both ends thereof at a center of 180 °, and ends from the first bent portion 41A. The first bundling member 41 provided with a second bent portion 42B formed by bending the portion side portion into a U-shape and attached to the bolt 43 across both ends of the first bundling member 41 The first plate 42 is configured. The bundling jig 40 abuts the steel plate 21 on the second bent portion 42B, abuts the vertical bars 30 on the first bent portion 41A, and attaches the first plate 42 across both ends of the steel rod, By tightening bolts 43 at both ends of the steel material and pressing the first plate 42 against the longitudinal bars 30, the first plate 42 and the first binding member 41 sandwich the steel plate 21 and the longitudinal bars 30 so that these Is fixed. Thus, the binding jig 40 is effective when the vertical bars 30 are positioned above the steel plate 21 when the reinforcing bar 10 described later is built because the bolts 43 are tightened from the vertical bars 30 side.

Further, as shown in FIG. 3, the binding jig 50 includes a first bent portion 51B formed by bending the center of a steel rod having a screw shape at both ends into a U-shape, and a first bent portion. A second bundling member 51 provided with a second bent portion 51A formed by bending a part on the end side from 51B into a U-shape, and attached to both ends of the second bundling member 51 And the second plate 52. The binding jig 50 has the vertical bars 30 fitted into the second bent portion 51A, the steel plate 21 is brought into contact with the first bent portion 51A, the bolts 53 are fastened to both ends of the steel material, and the second plate 52 is attached. Are pressed against the steel plate 21 so that the second plate 52 and the second binding member 51 sandwich the steel plate 21 and the vertical bars 30 to fix them. Thus, the binding jig 50 is effective when the steel plate 21 is positioned above the vertical bars 30 when the rebar cage 10 to be described later is assembled because the bolt 53 is tightened from the steel plate 21 side.
Further, the vertical bars 30 and the horizontal bars 31 are fixed by the binding members described in the section of the prior art.

  FIG. 4 is a diagram illustrating a state in which the reinforcing steel basket 10 is assembled. In order to assemble the rebar cage 10, first, as shown in FIG. 2A, a plurality of horizontal bars 31 are arranged on the ground at predetermined intervals, and a predetermined perpendicular to the horizontal bars 31 is provided above the horizontal bars 31. A plurality of vertical stripes 30 are arranged with an interval of. Then, the vertical bars 30 and the horizontal bars 31 are connected by a binding member described in the column of the prior art.

  Next, as shown in FIG. 4B, the reinforcing member 20 is disposed above the vertical bars 30. And the vertical reinforcement 30 and the steel plate 21 which comprises the reinforcement member 20 are fixed with the binding tool 50 shown in FIG. At this time, as shown in FIG. 4 (B), the steel plate 21 of the reinforcing member 20 is positioned above the longitudinal bars 30. As described above, in the binding jig 50, the bolt 53 is positioned on the steel plate 21. Since it is the structure which attaches from the side and fixes the steel plate 21 and the vertical reinforcement 30, the attachment operation | work of the binding tool 50 can be performed smoothly.

Next, as shown in FIG. 4C, the vertical bars 30 are arranged above the steel plate 21 on the upper side of the reinforcing member 20 with a predetermined interval. Then, the vertical bars 30 and the steel plate 21 are fixed by a binding jig 40 shown in FIG. At this time, as shown in FIG. 4C, the steel plate 21 is positioned below the vertical bars 30. As described above, the binding jig 40 attaches the bolts 43 from the side where the vertical bars 30 are positioned. Since the steel plate 21 and the vertical bars 30 are fixed to each other, the attaching operation of the binding jig 40 can be smoothly performed from above. Then, the horizontal stripes 31 are arranged above the vertical stripes 30 with a predetermined interval. Then, the vertical bars 30 and the horizontal bars 31 are fixed by the binding members described in the column of the prior art.
The rebar cage 10 can be assembled by the above process.

  FIG. 5A is a perspective sectional view showing a state in which a conventional reinforcing steel car 110 is lifted, and FIG. 5B is a vertical sectional view. As described in the column of the prior art, in the conventional reinforcing steel cage 110, the reinforcing members 120 in which the steel plates 121 and 122 are assembled in a lattice shape in a plan view are disposed at positions corresponding to the upper and lower heights of the reinforcing steel cage 110. In addition, the vertical bars 30 are connected to both surfaces of the reinforcing member 120. Then, when lifting the reinforcing bar car 110, the reinforcing member 120 located above is lifted as shown in FIG. As described above, in the conventional method, only the reinforcing member 120 positioned above is lifted, so that all the weights of the vertical bars 30 act on the joints between the vertical bars 30 and the steel plates 121 constituting the reinforcing member 120. Resulting in.

  FIG. 6 is a vertical sectional view showing a state in which a conventional reinforcing steel car 110 is connected and lifted. When the depth of the underground wall is large, a reinforcing bar 110 is connected and used. Conventionally, when the rebar cages 110 are connected and used in this manner, the rebar cages 110 are connected by connecting the vertical bars 30 of the upper and lower rebar cages 110 with a mechanical joint 130 or the like, as shown in FIG. Were connected. When the reinforcing bar car 110 is lifted, the reinforcing members 120 located above the upper reinforcing bar car 110 are lifted, so that the vertical bars 30 constituting the upper reinforcing bar car 110 have two parts. The dead weight of the vertical bars 30 acts, and a larger load acts on the joint between the steel plate 121 and the vertical bars 30 of the upper reinforcing member 120. As described above, in the conventional method, a large load acts on the joint between the steel plate 121 and the vertical bars 30, so the vertical bars 30 and the steel plate 121 constituting the reinforcing member 120 must be connected more firmly. It was.

  FIG. 7 is a vertical cross-sectional view showing a state where the reinforcing bar 10 according to the present embodiment is lifted. As shown in the figure, in this embodiment, the reinforcing bar 20 is lifted by lifting a vertical member 22 constituting the reinforcing member 20. Here, the vertical bars 30 are connected to the steel plate 21 at the upper part and the lower part, and these steel plates 21 are connected to the vertical member 22. For this reason, the weight of the vertical bars 30 is supported by the upper and lower steel plates 21, and the load acting on the joint between the steel plates 21 and the vertical bars 30 is also smaller than before.

  Moreover, FIG. 8 is a figure which shows a mode that the reinforcing bar 20 of this embodiment is connected and it lifts. As shown in the figure, in this embodiment, when the reinforcing bar 10 is connected and lifted, the vertical members 22 of the upper and lower reinforcing bars 10 are connected. Moreover, since the vertical bars 30 of the upper and lower reinforcing steel baskets 10 are joined by lap joints, they only have to be arranged so that the ends thereof overlap each other, and the vertical bars 30 are not joined to each other. Therefore, even when a plurality of reinforcing bars 10 are connected, the weight of the vertical bars 30 constituting the lower reinforcing bars 10 is not transmitted to the vertical bars 30 of the upper reinforcing bars 10. In each rebar cage 10, the weight of the vertical bars 30 is supported by the upper and lower steel plates 21, and the load acting between the vertical bars 30 and the steel plates 21 is the same as when the rebar cage 10 is not connected. For this reason, even if the vertical bars 30 and the steel plate 21 are fixed by the binding jigs 40 and 50 as shown in FIGS. 2 and 3, the load acting between the vertical bars 30 and the steel plate 21 can be withstood. In the present embodiment, the vertical bars 30 of the upper and lower rebar cages 10 are jointed by lap joints.

  As described above, according to the present embodiment, the steel plate 21 is attached to the pair of vertical members 22 with a space therebetween in the vertical direction, and the vertical bars 30 are fixed to the steel plate. The load of the vertical bars 30 will be supported, and the load acting on the joint between the steel plate 21 and the vertical bars 30 will be smaller than before.

  Further, when connecting a plurality of reinforcing bars 10, the vertical bars 30 of the upper and lower reinforcing bars 20 are connected by lap joints, so that the load of the vertical bars 30 of the lower reinforcing bars 10 is the vertical length of the upper reinforcing bars 10. It is not transmitted to the muscle 30.

  For this reason, even if it is the binding jigs 40 and 50 which fix the vertical bar 30 and the steel plate 21 as shown in FIG. 2, FIG. 3, without a big load acting on the junction part of the vertical bar 30 and the steel plate 21, The load acting between the longitudinal bars 30 and the steel plate 21 can be withstood. For this reason, by using the binding jigs 40 and 50, welding is not necessary on the site, and the rebar cage can be assembled and lifted without being affected by the weather.

In the present embodiment, the vertical bars 30 and the steel plate 21 are fixed by the binding jigs 40 and 50 as shown in FIGS. 2 and 3. However, the present invention is not limited to this, and the vertical bars are not welded. As long as it can fix 30 and the steel plate 21, it can be used.
Similarly, a restraining member that fixes the vertical bars 30 and the horizontal bars 31 may be used as long as the vertical bars 30 and the horizontal bars can be fixed without welding.

In this embodiment, a pair of the vertical members 22 are provided. However, the present invention is not limited to this, and the number of the vertical members may be one or three or more as long as the load can be supported. It is. The shape of the vertical member is not limited to a plate shape as in the present embodiment, and a prismatic member or the like may be used.
In the present embodiment, a pair of steel plates 21 are provided. However, the present invention is not limited to this, and three or more steel plates 21 may be provided.
Moreover, although this embodiment demonstrated the case where the rebar cage which comprises a underground wall was lifted, this invention is applicable not only to this but also when the rebar cage which comprises a wall pile is lifted.

It is a perspective view which shows the reinforcing steel cage used as the object of lifting by the lifting method of this embodiment. It is an expansion perspective view of the A section of Drawing 1, (A) is a side view of a binding jig, (B)-(D) is a BD arrow view in (A), respectively, (E) It is a figure which shows the back surface of (A). It is an expansion perspective view of the B section of Drawing 1, (A) is a side view of a binding jig, (B)-(D) is a BD arrow view in (A), respectively, (E) It is a figure which shows the back surface of (A). It is a figure which shows a mode that a rebar cage is assembled. (A) is a perspective sectional view which shows a mode that the conventional rebar cage is lifted, (B) is a vertical sectional view. It is a vertical sectional view which shows a mode that the conventional rebar basket is connected and lifted. It is a vertical sectional view which shows a mode that the reinforcing bar cage of this embodiment is lifted. It is a figure which shows a mode that the rebar basket of this embodiment is connected and lifted. It is a perspective view which shows the reinforcing steel cage conventionally used when constructing an underground wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reinforcement basket 20 Reinforcing member 21 Steel plate 30 Longitudinal bar 31 Horizontal bar 40, 50 Bundling jig 41, 51 Bundling member 42, 52 Plate 43, 53 Bolt

Claims (8)

Consists of a ground wall comprising a plurality of vertical bars extending in the vertical direction and arranged at intervals in the horizontal direction, and a plurality of horizontal bars extending in the vertical direction on the plurality of vertical bars and spaced in the vertical direction A method of lifting a reinforcing steel cage,
The plurality of vertical bars are attached to each horizontal member of the reinforcing member, which includes a vertical member extending in the vertical direction and a plurality of horizontal members attached to the vertical member so as to extend in the horizontal direction with an interval in the vertical direction. Keep each one fixed,
A method for lifting a reinforcing bar car, wherein the reinforcing bar car is lifted through the reinforcing member. A method for lifting a rebar cage according to claim 1,
A method for lifting a reinforcing bar car, wherein the plurality of reinforcing steel bars connected vertically are lifted while connecting the vertical members of the reinforcing bar cars vertically adjacent to each other. A method for lifting a rebar cage according to claim 1 or 2,
The said horizontal member and the said longitudinal bar are fixed with the jig | tool which can restrain these horizontal members and a vertical bar, The lifting method of the reinforcing bar cage | basket | cage characterized by the above-mentioned. A method for lifting a rebar cage according to any one of claims 1 to 3,
The vertical bar and the horizontal bar are fixed by a jig capable of restraining a pair of reinforcing bars arranged so as to intersect with each other. Consists of a ground wall comprising a plurality of vertical bars extending in the vertical direction and arranged at intervals in the horizontal direction, and a plurality of horizontal bars extending in the vertical direction on the plurality of vertical bars and spaced in the vertical direction A rebar basket that
The plurality of vertical bars are provided on each horizontal member of the reinforcing member, which includes a vertical member extending in the vertical direction and a plurality of horizontal members attached to the vertical member so as to extend in the horizontal direction with an interval in the vertical direction. Reinforcing bar cages characterized by being fixed respectively. A rebar cage according to claim 5,
The horizontal member and the vertical bar are fixed by a jig capable of restraining the horizontal member and the vertical bar. Reinforcing bar cage according to claim 5 or 6,
The vertical bar and the horizontal bar are fixed by a jig capable of restraining a pair of reinforcing bars arranged to intersect with each other. A method for assembling a reinforcing steel cage embedded in the underground wall,
Place multiple horizontal stripes on the ground,
A plurality of vertical bars are attached above the plurality of horizontal bars so as to extend substantially perpendicular to the horizontal bars,
From a long vertical member and a plurality of horizontal members attached to both sides of the vertical member so as to extend in a substantially vertical direction with respect to the vertical member with an interval in the axial direction of the vertical member The vertical member and the vertical bars are substantially parallel above the vertical bars, and the horizontal member on one surface is in contact with the vertical bars,
Fixing the plurality of vertical bars to the horizontal members on the one side,
A plurality of vertical bars are arranged substantially parallel to the vertical member above the horizontal member on the other side,
Fixing the horizontal member on the other side and the plurality of vertical bars,
A method of assembling a reinforcing bar cage, comprising attaching a plurality of horizontal bars so as to extend substantially perpendicular to a plurality of vertical bars fixed to the horizontal member on the other side.