TWI480452B - Reinforcing structure and reinforcing method of reinforcement cage - Google Patents

Description

Reinforcement structure and reinforcement method of steel cage

The invention relates to a reinforcing structure and a reinforcing method for a steel cage for avoiding deformation of a steel cage in the middle of lifting a steel cage.

It is well known that in construction sites, columns or foundation piles are constructed by casting concrete into a vertical cage.

The above-mentioned reinforcing cage has a plurality of reinforcing bars (hereinafter referred to as main ribs) which extend parallel to each other and extend linearly; a plurality of annular reinforcing bars (hereinafter referred to as ring ribs) which are spaced apart in the longitudinal direction so as to surround the main ribs Configuration. The main ribs and the ring ribs are joined by thin metal wires at the intersections thereof.

The above-mentioned steel cages are assembled at a factory or a construction site, placed on a ground in a horizontal position on a construction site, and hoisted by a crane when necessary, and transported to a predetermined portion of a column or a foundation pile. Refer to Patent Document 1.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4137173

The above steel cages are usually lifted using a crane. In detail, the hanging device suspended from the front end of the boom of the crane clamps the reinforcing cage from a position deviated from the center thereof, and lifts the reinforcing cage in this state. Thereby, the steel cage rises obliquely from the initial horizontal posture, and finally becomes a vertical posture and leaves the ground.

When the reinforcing cage becomes inclined as described above, it becomes a state in which one end of the reinforcing cage is in contact with the ground. The plurality of main ribs of the steel cage are arranged in a state of being spaced apart from each other, and only one of the ends of the main ribs at the lowermost position becomes in contact with the ground. The other main ribs are subjected to the force in the longitudinal direction caused by their own gravity, and thus are offset in the length direction with respect to the lowermost reinforcing bars. The position of the topmost main rib is the largest. Along with the positional deviation of the main ribs, the ring rib is inclined with respect to the state of the main rib from the right angle, and the longitudinal dimension of the cross-sectional shape of the reinforcing cage (the interval between the lowermost main rib and the uppermost main rib) is reduced. Such deformation of the steel cage can cause obstacles to the connection of the upper and lower steel cages.

Further, in a state where the reinforcing cage is inclined, only one end portion of the lowermost main rib is subjected to a large reaction force caused by the weight of the reinforcing cage from the ground, and abuts against the ground and is towed. As a result, one end portion of the lowermost main rib is deformed or damaged.

As described above, the deformation of the entire steel cage or the deformation of one end of the main reinforcement is more likely to occur if the length of the reinforcement cage is longer and the weight of the reinforcement cage is larger.

Therefore, when the steel cage is long and the weight is large, a plurality of reinforcing ribs are installed inside the steel cage to avoid deformation of the steel cage as a whole, but the internal reinforcing ribs do not contribute to the pillars buried behind the concrete, etc. Increased strength and waste. Moreover, it does not help to prevent deformation or damage of one end portion of the above-mentioned lowermost main rib.

In order to avoid the above-mentioned defects, a method is also adopted in which a secondary crane is used in addition to the main crane, and the steel cage is changed from a horizontal posture to a vertical posture in a state of floating from the ground. However, in this method, it is necessary to be skilled in crane operation.

The present invention has been made in order to solve the above problems, and is a reinforcing structure of a steel cage, which is characterized in that a steel cage including a plurality of main ribs parallel to each other is suspended, thereby making the steel cage from a horizontal posture The one end portion is grounded in an inclined posture, and is used to reinforce the steel cage during the vertical posture. In the one end portion of the reinforcing cage, the reinforcing rib connects one end of the lowermost main rib to the uppermost position. One end of the main rib.

According to the above configuration, since the reinforcing rib is connected to the end portion of the uppermost main rib by the reinforcing rib, the position of the uppermost main rib relative to the longitudinal direction of the lowermost main rib is biased. The removal is eliminated, thereby preventing deformation of the entire steel cage. Therefore, there is no need for an internal reinforcing rib to prevent deformation of the entire steel cage, or the number thereof can be reduced. Moreover, since the reinforcing cage is hoisted in a state in which one end portion is grounded, complicated crane operation is not required.

Moreover, since not only the lowermost main rib, the uppermost main rib can also bear the reaction force from the ground, so that the deformation of one end of the lowermost main rib can also be avoided.

Preferably, the reinforcing rib comprises: a linear main portion, and a pair of joint ends connected to both ends of the main portion and extending orthogonally to the main portion; the pair of joint ends are respectively detachable The ground is connected to one end of the lowermost main rib and one end of the uppermost main rib.

According to this, the reinforcing ribs can be removed and reused, thereby avoiding waste of materials. Further, the reinforcing ribs can be easily coupled to one end portion of the main rib or one end portion of the rib to be removed via a pair of joint ends.

Preferably, one of the reinforcing ribs has a tubular connector at the joint end, and one end of the main rib of the reinforcing cage is inserted into each of the joints in line with the joint end of the reinforcing rib.

According to this, the joining work of the reinforcing ribs can be made easier.

Preferably, a male thread is formed on an outer circumference of at least one of the lowermost and uppermost main ribs of the reinforcing cage, and a male thread is formed on an outer circumference of at least the pair of joint ends of the reinforcing rib to form an inner circumference of the connector. a female thread, and the end of one end of the main rib and the reinforcing rib is screwed to the connector.

By the screwing described above, the joining work can be made easier, and the unloading operation can be facilitated. Moreover, since the strength of the connection between the reinforcing rib and the main rib is high, the reinforcing effect of the reinforcing cage can be improved.

Another aspect of the present invention is a reinforcing method for a steel cage, characterized in that: in a state in which a steel cage containing a plurality of main ribs parallel to each other is in a horizontal posture, at one end of the reinforcing cage, a reinforcing rib is used Connecting one end of the lowermost main rib to one end of the uppermost main rib; lifting the portion which is offset from the center of the longitudinal direction of the reinforcing cage to the other end side, so that the reinforcing cage is grounded at the one end The inclined posture further becomes a vertical posture and floats from the ground; and after the reinforcing cage is floated from the ground, the reinforcing rib is removed from the main rib.

According to the present invention, deformation of the reinforcing cage can be prevented by lifting the reinforcing cage by using the reinforcing ribs.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1(A) and Fig. 4 show a steel cage 10 for a column (vertical structure) manufactured at a factory or a construction site. The steel cage 10 includes a plurality of steel bars (steel bars) 11 extending linearly (hereinafter referred to as main bars), and a plurality of steel bars (steel bars) 12 (hereinafter referred to as ring bars).

The main ribs 11 are parallel to each other and are arranged at intervals between the corner portions and the side portions of the quadrilateral as shown in FIG. Further, the main rib 11 may be additionally disposed inside the quadrilateral.

The ring ribs 12 are formed in a quadrangular shape so as to surround the main ribs 11, and are disposed at intervals in the longitudinal direction of the main ribs 11.

The ring ribs 12 intersect the main ribs 11 at right angles, and are joined at the intersection by a thin metal wire (not shown).

In the present embodiment, the so-called "rebar" is used for the main rib 11. The "threaded steel bar" is a steel bar formed by spanning the entire length of the male thread during the rolling step. As shown in FIG. 7, the male thread 11a includes a plurality of thread-shaped segments which are in the diametrical direction of the main rib 11 in the two elongated regions 11x, which are in a range of angles smaller than 180°. form. Further, a threaded joint is not formed in the region 11y between the two regions 11x.

The ring ribs 12 may be threaded bars or may not be threaded bars.

As shown in Fig. 1(A) and Fig. 4, at one end of the reinforcing cage 10, that is, at the end portion on the right side, a connector 13 is attached to one end of all the main ribs 11. These connectors 13 are formed in a cylindrical shape as shown in Fig. 7, and a female screw 13a is formed on the inner circumference thereof. A male thread 11a at one end of the main rib 11 is screwed to the female thread 13a.

As shown in Fig. 1(A), Fig. 2 and Fig. 4, at the one end portion of the reinforcing cage 10, the lowermost main rib 11 (i.e., the main rib 11 below the cross-sectional shape of the quadrilateral shape of the reinforcing cage 10) is all The U-shaped reinforcing rib 14 is coupled to the corresponding uppermost main rib 11.

As shown in Fig. 7, the reinforcing rib 14 includes a reinforced bar in the same manner as the main rib 11, and has a male screw 14a across the entire length. The reinforcing rib 14 is obtained by cutting a straight reinforced bar obtained by rolling into a specific length and bending it by bending both ends thereof. The reinforcing rib 14 has a main portion 14x extending linearly, and a pair of short coupling end portions 14y connected to both ends of the main portion 14x and extending orthogonally and linearly with the main portion 14x.

As shown in FIG. 1(A), FIG. 2, FIG. 4, and FIG. 7, one of the reinforcing ribs 14 is coupled to the upper and lower main ribs 11 via the connector 13 via the coupling end portion 14y. Hereinafter, the connection operation will be described.

Before the connection, the connector 13 of the lowermost and uppermost main ribs 11 is screwed to the main rib 11 in the same manner as the connector 13 of the other main ribs 11 in the same direction. In this state, the front end of the main rib 11 and the end surface of the connector 13 are in the same plane or protrude therefrom.

After one of the reinforcing ribs 14 is placed on the same straight line as the upper end rib 11 and the upper and lower main ribs 11, the connector 13 is moved while rotating toward the joint end portion 14y. As a result, as shown in FIG. 7, one of the connectors 13 is half-spliced to the end of the main rib 11, and the other half is screwed to the joint end 14y. As a result, each of the joint end portions 14y of the reinforcing ribs 14 is detachably coupled to one end portion of the corresponding main rib 11 via the connector 13.

The reinforcing structure S of the reinforcing cage 10 of the present invention comprises the following components: all of the reinforcing ribs 14; and a connector 13 that is coupled to one of the reinforcing ribs 14 at one end portion 14y to the end of the main rib 11 corresponding thereto unit.

Next, the action of the reinforcing structure S having the above-described configuration in the lifting step of the reinforcing cage 10 will be described. As shown in FIG. 1(A) and FIG. 4, the reinforcing cage 10 is horizontally placed on the ground via the angle member 20.

On the other hand, the sling 30 is suspended from the front end of the boom of a crane (not shown), and a support member 31 such as a hook is fixed to the lower end thereof (schematically shown in Fig. 1(A)).

A hanging device 40 is attached to the support member 31. As best shown in FIG. 3, the suspension device 40 has a balance-type support rod 41. The center of the support rod 41 is coupled to the support member 31 via the first suspension wire 42. The pulley 44 is rotatably supported at both ends of the support rod 41 via the second second suspension wire 43. An intermediate portion of the third suspension wire 45 is placed on each of the pulleys 44, and the clamp 46 is fixed to both ends of each of the third suspension wires 45.

As shown in FIG. 3, the jig 46 detachably holds the four main ribs 11 at the corners of the cross-sectional shape of the quadrangular shape of the reinforcing cage 10. As shown in FIG. 1(A), the holding position is shifted from the center in the longitudinal direction of the reinforcing cage 10 toward the opposite side of the reinforcing structure S.

Next, the crane is operated to lift the above-described steel cage 10. In the middle, the reinforcing cage 10 is erected obliquely as shown in FIG. 1(B) and FIG. 5, and one end portion thereof is in contact with the ground. In this state, since the lowermost main rib 11 is coupled to the uppermost main rib 11 by the reinforcing rib 14, it is possible to prevent the position of the uppermost main rib 11 from being displaced in the longitudinal direction with respect to the lowermost main rib 11. Since the main rib 11 in the middle is also connected to the lowermost and uppermost main ribs 11 via the ring ribs 12, the positional deviation in the longitudinal direction can be prevented. As a result, deformation of the entire reinforcing cage 10 can be prevented.

Further, a reaction force from the ground caused by the weight of the reinforcing cage 10 is applied to one end portion of the lowermost main rib 11, and is also applied to one end portion of the upper main rib 11 via the reinforcing rib 14. As a result, the reaction force burdened by the lowermost main rib 11 can be halved, and deformation can be prevented.

Further, in a state where the reinforcing cage 10 is erected obliquely, the end portion of the lowermost main rib 11 is not directly grounded, but the bent portion of the reinforcing rib 14 (the portion where the main portion 14x and the joint end portion 14y are connected) is grounded. Therefore, even if the reinforcing cage 10 is towed along the ground, one end portion of the lowermost main rib 11 is not damaged.

When the reinforcing cage 10 is further hoisted, the reinforcing cage 10 is in a vertical posture as shown in Fig. 6(A), and if it is further lifted, it is separated from the ground. In this state, the reinforcing ribs 14 are removed as shown in Fig. 6(B). The lifting operation of the reinforcing rib 14 can be realized by moving the corresponding connector 13 while moving it upward along the main rib 11. The reinforced rib 14 can be reused.

Next, as shown in Fig. 6(C), the reinforcing cage 10 is moved to the immediately above the reinforcing cage 10' of the lower layer. The lower layer steel cage 10' has the same configuration as the hoisted steel cage 10, and has a plurality of main ribs 11' and ring ribs 12', and has been removed from the concrete 50 by removing the upper end portion.

In the step of FIG. 6(C), the main ribs 11 of the hoisted steel cage 10 are aligned with the main ribs 11' of the lower-layer steel cage 10', and the main ribs 11, 11' are made. Close.

Next, as shown in Fig. 6(D), all of the connectors 13 of the reinforcing cage 10 are rotated to move downward, and half of them are screwed to the main ribs 11' of the lower reinforcing cage 10'. Thereby, the main ribs 11, 11' of the upper and lower reinforcing cages 10, 10' are connected to each other by the connector 13. Further, an injection port (not shown) may be formed in the center of the connector 13, and grouting such as mortar may be injected from the injection port to increase the joint strength.

As can be understood from the above description, in the present embodiment, in order to connect the main rib 11 and the reinforcing rib 14, the connector 13 for connecting the main ribs 11, 11' of the upper and lower reinforcing bars 10, 10' is used together, and for the reinforcing cage The reinforcing element S of 10 is added, and the additional component is only the reinforcing rib 14 . Therefore, the cost for reinforcement can be suppressed.

The present invention is not limited to the above embodiments, and various forms can be employed. For example, in the above-described embodiment, as the main rib and the reinforcing rib, a reinforced bar having a male screw formed by rolling is used. However, as the main rib and the reinforcing rib, a general-shaped reinforced bar may be used, and cutting may be used. The machining is performed only at one end of the main rib and one of the reinforcing ribs forms a male thread to the joint end.

In the above embodiment, the joint end of one end portion of the main rib and the reinforcing rib is coupled to the fastener by screwing, but the joint may be detachably coupled by a method other than screwing. For example, in a state in which only one end portion of the main rib and the reinforcing rib are inserted into a connector having a cylindrical shape, the joint end of one of the main ribs and the reinforcing rib may be detachably attached by a jig. Fixed to the connector. In this case, ordinary shaped bars can also be used as the main ribs and reinforcing ribs.

Further, the connector may be detachably coupled by the jig while the one end of the main rib and the joint end of the reinforcing rib are in a straight line without using a connector.

Further, the one end portion of the main rib and the joint end portion of the reinforcing rib may be adjacent to each other in parallel, and may be detachably coupled by a jig or a thin metal wire.

The joint end of one of the main ribs and the reinforcing rib may be joined by inseparable joints such as welding.

In the above embodiment, the ribs are connected to the uppermost main ribs by the reinforcing ribs, but only the main ribs selected from the lowermost main ribs may be connected to the corresponding uppermost ribs. . In this case, the end portion of the main rib that is not connected to the reinforcing rib is separated from the ground when the steel cage is erected obliquely.

The present invention is mainly applied to a steel cage used for a vertical structure such as a column or a pile, but can also be applied to a case where a steel cage for use in other structures is suspended and transported.

The device for lifting the reinforcing cage is not particularly limited. For example, the middle portion of the hanging wire having the jigs at both ends may be hung on the hook provided at the lower end of the sling.

[Industrial availability]

The present invention is applied to prevent deformation of a steel cage when lifting a steel cage used in a column or a pile or the like.

10. . . Steel cage

10'. . . Steel cage

11. . . Main tendons

11'. . . Main tendons

11a. . . Male thread

11x. . . region

11y. . . region

12. . . Ring

12'. . . Ring

13. . . Connector

13a. . . Female thread

14. . . Reinforcement

14a. . . Male thread

14x. . . Main department

14y. . . Combined end

20. . . Angle

30. . . Sling

31. . . Support

40. . . Hanging device

41. . . Support rod

42. . . 1st hanging line

43. . . 2nd hanging line

44. . . pulley

45. . . 3rd hanging line

46. . . Fixture

50. . . Concrete

S. . . Reinforcing structure

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view of a steel cage according to an embodiment of the present invention, wherein (A) shows a state in which a column in a horizontal posture of a reinforcing end portion is to be lifted by a steel cage by a crane, and (B) shows a steel cage. Has been lifted and tilted.

Figure 2 is a view of the II-II arrow in Figure 1 (A).

Figure 3 is a cross-sectional view taken along line III-III of Figure 1 (A).

Fig. 4 is an enlarged view showing a part of the reinforcing cage of Fig. 1(A) omitted.

Fig. 5 is an enlarged view showing a part of the reinforcing cage of Fig. 1(B) omitted.

Fig. 6 is a side view showing the reinforcing cage in a state of being vertically suspended, (A) showing a state in which a reinforcing rib is attached to the lower end portion, (B) showing a state in which the reinforcing rib is removed, and (C) showing a column in the lower layer. The state in which the upper end portion of the reinforcing cage is aligned is used, and (D) indicates the state in which the upper end portion of the reinforcing cage is connected to the lower layer.

Fig. 7 is a cross-sectional view showing a reinforcing structure of an end portion of a reinforcing cage which is an essential part of Fig. 1(A).

10. . . Steel cage

11. . . Main tendons

12. . . Ring

13. . . Connector

14. . . Reinforcement

20. . . Angle

30. . . Sling

31. . . Support

40. . . Hanging device

41. . . Support rod

42. . . 1st hanging line

44. . . pulley

45. . . 3rd hanging line

46. . . Fixture

S. . . Reinforcing structure

Claims (4)

A reinforcing structure for a steel cage, which is characterized in that it is a steel cage that hoistes a plurality of main ribs that are parallel to each other in a straight line, thereby causing the steel cage to be tilted from the horizontal posture to the one end, thereby becoming a vertical posture. In the process, the reinforcement cage is used for reinforcement, and at the one end of the reinforcement cage, the reinforcement rib connects one end of the lowermost main rib and one end of the uppermost main rib, wherein the reinforcement rib comprises: a straight line a main portion and a pair of joint ends connected to both ends of the main portion and extending orthogonally to the main portion; the pair of joint ends are detachably coupled to one end of the lowermost main rib One end of the main rib with the top. The reinforcing structure of the reinforcing cage according to claim 1, wherein the one of the reinforcing ribs and the joining end portion are provided with a tubular shape connector, and the end portion of one of the main ribs of the reinforcing steel cage and the reinforcing rib is combined with the reinforcing rib Inserted into each connector in a straight line. The reinforcing structure of the reinforcing cage according to claim 2, wherein a male thread is formed on an outer circumference of at least one end portion of the lowermost and uppermost main ribs of the reinforcing cage, and a male thread is formed on an outer circumference of at least the pair of joining ends of the reinforcing rib A female thread is formed on the inner circumference of the connector, and a joint end of one end of the main rib and the reinforcing rib is screwed to the connector. A reinforcing method for a steel cage, characterized in that, in a state in which a steel cage containing a plurality of main ribs parallel to each other is in a horizontal posture, one end of the main rib is connected by a reinforcing rib at one end of the reinforcing cage One end of the main rib and the uppermost rib; The reinforcing rib used for the connection includes: a linear main portion, and a pair of joint ends connected to both ends of the main portion and extending orthogonally to the main portion; the pair of joint ends may respectively Attached to one end portion of the lowermost main rib and one end portion of the uppermost main rib; and hoisted by grasping a portion offset from the center in the longitudinal direction of the reinforcing cage to the other end side, thereby making the reinforcing cage The inclined posture in which the one end portion is grounded is further raised in a vertical posture and floated from the ground; and after the reinforcing cage is lifted from the ground, the reinforcing rib is removed from the main rib.