KR101688773B1 - Reversible pretress introduction device and reinforcement and reconstruction method of structure using the same - Google Patents

Abstract

The present invention provides a reversible prestress introduction device and a method for reinforcing and restoring a structure using the same which cause an upward reversal by a tightening force to introduce prestress to reinforce a new and an old structure and restore deflection and deformation. According to a proper embodiment of the present invention, the method for reinforcing and restoring a structure comprises: (a) a step of fixing and installed an angle member pivot bracket on opposite sides of a structure; (b) a step of connecting one end of both angle members to the angle member pivot bracket by a pivot; (c) a step of arranging a upward reaction part positioned below the structure between both angle members, and then connecting the upward reaction part to an upper portion of the other end of both angle members by a pivot from both ends of an upper portion to assign a tightening angle spread between both angle members and the upward reaction part; and (d) a step of upwardly rotating both angle members by a tightening means and performing a reverse operation for upwardly and vertically moving the upward reaction part to apply an upward force to a bottom surface of a slab.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible prestress introduction apparatus and a method of reinforcing and restoring a structure using the same,

The present invention relates to a prestress introduction device for a structure and a method for reinforcing and restoring a structure using the prestress introduction device. More particularly, the present invention relates to a prestress introduction device for reinforcing a new and old structure, And a method of reinforcing and restoring a structure using the same.

Generally, the principal stress of the slab is the bending moment, so deflection and deformation may occur. As a method of reinforcing the slab to prevent such sagging and deformation, there are known steel plate bonding method, prestressing method, member extension method, and the like. The steel plate bonding method is a method for improving the strength by bonding a steel plate to the tensile side surface and integrating the same with the existing structure. The steel plate bonding method is to integrate the reinforced concrete member and the steel material so that the steel plate functions as a part of the steel rope. Therefore, care should be taken to ensure that the steel plate and concrete are adhered or fixed sufficiently. The prestressing method is a method for imparting a compressive stress as well as restoring a crack by reducing a tensile stress occurring in a member by applying a prestressing force to reinforce the PC steel according to the introduction of a prestress.

Here, the method using the PC steel in the prestressing method introduces the prestressing in the process of constructing the bottom plate, and it is not applicable to the structure in which deflection or deformation has already occurred, and a measure is required.

As a background of the present invention, Korean Patent Registration No. 10-0593664, a synthetic flooring method in which a prestress is introduced has been proposed. This is because the bottom plate and the vertical stiffener are combined with the bottom plate including the concrete subjected to compressive stress by the tensile material, so that it is possible to achieve weight saving and easy construction while maintaining high load resistance performance and fatigue durability, The present invention relates to a method of constructing a composite bottom plate excellent in shortening of the air flow rate and economical efficiency, in which a vertical reinforcement is installed on a lower plate, a tension member is installed, a bottom plate is formed on the lower plate so that the vertical reinforcement and the tension member are formed therein, A step of modifying the composite bottom plate at the factory by introducing a prestress into a bottom plate formed at the bottom of the bottom plate by fixing the tension member installed on the bottom plate after tension; And a prefabricated modularized composite deck at a factory are carried to the site, a composite deck is placed at a position where the composite deck is to be installed, the composite decks are fixed to each other in the longitudinal direction and the transverse direction, And forming a composite bottom plate by separately forming a connection bottom plate at a connection portion of the connected composite bottom plate. Therefore, the flexural rigidity is increased, so that it is possible to support a larger external load (common load) even with a small cross section.

However, the above background art has a problem that it is difficult to apply the process to the installation of a tension member and the introduction process of a prestress before a composite bottom plate is added, and it is difficult to apply to the restoration or deflection restoration of a previously installed structure.

Korean Patent Registration No. 10-0593664

The present invention provides an inverting prestress introducing apparatus capable of reinforcing a new and old structure by introducing a prestress by upside reversing by tightening force and restoring deflection and deformation, and a method of reinforcing and restoring a structure using the same. It has its purpose.

A method of reinforcing and restoring a structure according to a preferred embodiment of the present invention includes the steps of: (a) fixing an angle member pivot bracket to opposite sides of a structure; (b) pivotally connecting one end of each of the pair of angle members to the pivot bracket of the angle member; (c) After an upward reaction force band located below the structure is disposed between the two side angle members, the upward reaction force band is pivotally connected to the upper side of the other end side of the two side angle members at both ends of the upper side, To each other, a tightening angle that is uniformly spaced from each other; (d) performing a reverse operation to vertically move the upward reaction force band vertically while rotating the both side angle members upwardly by tightening means, and applying an upward force to the bottom surface of the slab .

After the step (d), bolts (or pins) are fastened to the lower pivot bracket of the upward reaction force band and a plurality of lower fixing holes mutually aligned with the left and right angle members to return the upward reaction force band and the left and right angle members Further comprising the step of suppressing the operation.

After step (d), the upper pivot bracket of the upward reaction force band and the bolts are fastened to the plurality of lower fixing holes mutually aligned with the left and right angle members to suppress the return action of the upward reaction force band and the left and right angle members The method further comprising steps of:

The method may further include the step of dismantling the fastening means after the step (d).

Further, the both side angle members are characterized by having a right triangle or an isosceles triangle shape.

Further, the upward reaction force band includes a pair of upper pivot brackets connected to an upper pivot on the other end of the angle member; A pair of vertical members each pivotally connected to the pair of upper pivot brackets; A pair of lower pivot brackets pivotally connected to the lower ends of the pair of vertical members; A lower horizontal member having both ends fixedly connected to the pair of lower pivot brackets; A pair of lower pivot brackets, one end of which is fixedly connected to the lower horizontal member at a predetermined angle; An upstanding support plate fixed to the other end of the workpiece; And a pair of upper horizontal members each having one end fixed to the pair of upper pivot brackets and each having a slot hole at the other end and connected by insertion between a fastening bolt fixed to the upward facing plate and a slot hole .

The tightening means includes an angle member side bolt support which is positioned in a section where the tightening angle is generated and fixed to the left and right angle member sides; An upward reaction force side bolt support spaced apart from the tightening bolt support and fixed to the upward reaction force side; And a tightening bolt supported at one end of the bolt support on the side of the angle member and the other end supported on the bolt support side of the upper side reaction force side.

In addition, in the step (d), a reversing operation is performed by further laminating a shim plate on the upper end of the upward reaction force band.

Meanwhile, an inverse prestress introducing apparatus according to the present invention includes: a pair of angle members, one end of which is pivotally supported on a structure; And an upward reaction force band pivotally disposed between the pair of angle members; The upward reaction force band includes a pair of upper pivot brackets pivotally connected to the upper ends of the other ends of the pair of angle members; A pair of vertical members pivotally connected to a pair of upper pivot brackets; A pair of lower pivot brackets pivotally connected to the lower ends of the pair of vertical members; A lower horizontal member having both ends fixed to a pair of lower pivot brackets; A pair of workpieces once fixedly connected to the pair of lower pivot brackets; And an upward-facing support plate fixedly connected to the other ends of the pair of workpieces and positioned at an upper center of the lower horizontal member.

In addition, the upward reaction force band may include a pair of upper horizontal members each having one end fixed to the pair of upper pivot brackets and the other end having a slot hole, the fastening bolt being fixed to the upward- .

According to the present invention, since the upward reaction force band arranged and connected between the pair of angle members is reversed in the upward direction to introduce the prestress, it is possible to reinforce the existing structure as well as the existing structure, have.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a perspective view of an inverting prestress introducing apparatus according to the present invention;
2 (a), 2 (b) and 3 (c) are conceptual structural diagrams of an inverting prestress introducing apparatus according to the present invention, which are sequential operational state diagrams.
FIGS. 3A and 3B are an installation state view and a partial enlarged view of an inverted prestress introduction apparatus according to the present invention, which is installed in a slab before inversion.
FIGS. 4A and 4B are an enlarged view and a partially enlarged view of an operating state in which a prestress is introduced after the inversion, in which the inverting prestress introducing apparatus according to the present invention is installed in a slab.
FIG. 5 is a schematic arrangement view of a slab in which an inversion type prestress introduction apparatus according to the present invention is applied. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

First, an embodiment of the inverting prestress introducing apparatus 10 will be described.

The inverting prestress introducing apparatus 10 may be installed at regular intervals on opposite sides of the beams 6 and 6 as shown in Fig. The inverting prestress introducing apparatus 10 includes a pair of angle members 20, 20a (not shown), which are rotatably supported by pivots P1, P1 on opposite sides of the beams 6, 6, And an upward reaction force band 30 connected to the pair of angle members 20 and 20a by pivots P2 and P2.

The upward reaction force band 30 includes a pair of upper pivot brackets 31 and 31a connected to upper ends of the other ends of the pair of angle members 20 and 20a via pivots P2 and P2, A pair of vertical members 32 and 32a whose upper ends are connected to pivot brackets 31 and 31a by pivots P3 and P3 and pivots P4 and P4 at lower ends of the pair of vertical members 32 and 32a, A lower horizontal member 34 having both ends fixed to the pair of lower pivot brackets 33 and 33a and a pair of lower pivot brackets 33 and 33a connected at one end to the pair of lower pivot brackets 33 and 33a, A pair of workpieces 35 and 35a fixedly connected to the brackets 33 and 33a and a pair of workpieces 35 and 35a fixedly connected to the other ends of the pair of workpieces 35 and 35a and positioned at the upper center of the lower horizontal member 34 And an upward facing plate 36.

In addition, the upward reaction force band 30 is fixed to the pair of upper pivot brackets 31 and 31a at one end thereof, has slot holes 371 at the other end thereof, and fastening bolts And a pair of upper horizontal members 37 and 37a connected by insertion between the upper and lower horizontal members 37 and 38 and the slot hole 371.

Here, the pivots P1, P2, P3, and P4 may be configured as pins or bolts that provide the center of rotation. The vertical members 32 and 32a, the lower horizontal member 34, the workpieces 35 and 35a, and the upper horizontal members 37 and 37a are formed of, for example, an L-shaped steel.

The inverted prestress introducing apparatus 10 constructed as described above is provided between the both side angle members 20 and 20a and the upward reaction force band 30 by the pivots P2 and P2 as shown in FIG. And has a disengaged tightening angle [theta].

Therefore, when the tightening angle? Is forcibly decreased gradually as shown in FIG. 2 (B), the both side angle members 20 and 20a are rotated upward, and the upward reaction force band 30 is vertically moved upward. The inversion operation occurs as shown in Fig. Therefore, the upward bearing plate 36 or the pair of upper horizontal members 37, 37a closely contact the bottom surface of the slab 5 to exert an upward force P, thereby introducing a prestress into the structure.

Here, as shown in Fig. 1, a pair of angle members 20 and 20a, a pair of vertical members 32 and 32a, a lower horizontal member 34, a pair of work pieces 35 and 35a, Needless to say, the members 37 and 37a may be configured such that the same members are symmetrically coupled to the back side of each of the members 37 and 37a.

Next, a method of reinforcing and restoring a structure using the inverted prestress introduction device 10 will be described. The structure applied to the present embodiment is applied to the RC slab or the deck slab as the slab 5, but the present invention is not limited thereto.

<Installation of pivot bracket>

First, as shown in Fig. 3A, angle member pivot brackets 14 and 14a are provided on opposite sides of both beams 6 and 6 facing each other. The angle member pivot brackets 14 and 14a are respectively fixed to the beams 6 and 6 through a plurality of anchor bolts 15.

<Installation of Angle Member>

Next, one end of each of the angle members 20 and 20a is rotatably connected to the pivot brackets 14 and 14a through the pivots P1 and P1. The pivots P1, P1 can be bolts or pins. Thus, the two side angle members 20, 20a are connected to the angle member pivot brackets 14, 14a so as to be rotatable about the respective pivots P1, P1. In case of bolts, the nuts are fastened together. In the case of pins, they can be fixed by E-ring or split pin.

The two side angle members 20 and 20a have the same structure. In the present embodiment, the two side angle members 20 and 20a are formed to have an isosceles triangle shape, but they may be a right triangle shape.

<Installation of upward reaction force unit>

Next, a trapezoidal upward reaction force band 30 positioned below the slab 5 is disposed between the two side angle members 20, 20a.

Thereafter, the upward reaction force band 30 is pivotally connected to the upper end of the other side of the two side-face angle members 20 and 20a by the pivots P2 and P2 so that the two side-face angle members 20 and 20a and the upward reaction force band 30 (See FIG. 2 (A)), the tightening angle?

<Upward force>

Then, when the tightening means 40 and 40a are tightened as shown in FIG. 3A, the both side angle members 20 and 20a are rotated upward, and at the same time, the upward reaction force band 30 is vertically moved upward, The upward force P is applied to the bottom surface of the base plate.

By the upward force generated in the upward reaction force unit 30, the prestress is introduced to the bottom surface of the slab 5 to reinforce the slab 5. Also, the slab 5 in which sagging or deformation is generated is restored by the upward force of the upward reaction force band 30.

As shown in FIG. 3B, the tightening means 40 and 40a include, for example, an angle member side bolt support 41 which is positioned in the section where the tightening angle? Is generated and which is fixed to the left and right side angle members 20 and 20a, An upward reaction force side bolt support 42 which is fixed to the side of the upward reaction force arm 30 so as to be spaced apart from the angle member side bolt support 41 and one end is supported by the bolt support 41 on the side of the angle member And a tightening bolt 43 whose other end is supported on the side of the bolt support 42 on the opposite side of the upward reaction force. The fastening bolt (43) can be further fastened with a fastening nut (44).

Therefore, in this embodiment, by increasing the amount of fastening between the tightening bolt 43 and the fastening nut 44, the fastening angle? Between the left and right angle members 20, 20a and the upward reaction force band 30 is reduced It is possible to vertically move the upward reaction force band 30 vertically and bring it into close contact with the bottom surface of the slab 5 to introduce a prestress.

At this time, when the tightening angle [theta] becomes 0 [deg.], The pair of vertical members 32, 32a on the upper side of the reaction force band 30 are vertically arranged so that the upper side reaction force band 30 has a rectangular shape as shown in FIG. .

&Lt; Suppression of return movement of the upward reaction force band and the left and right angle members &

3B and 4B, the lower pivot bracket 33, 33a of the upward reaction force piece 30 is inserted into the upper pivot bracket 33, 33a in order to suppress the return operation of the upward reaction force band 30 and the left and right angle members 20, The bolts B1 (or pins) are fastened to a plurality of lower fixing holes 331 and 201a mutually aligned with the left and right angle members 20 and 20a, 20a can be suppressed.

3b, the upper pivot bracket 31, 31a of the upward reaction force band 30 and the left pivot bracket 31, 31a of the upward reaction force band 30 are provided in order to suppress the return operation of the upward reaction force band 30 and the left and right angle members 20, The bolts B2 (or pins) are fastened to the plurality of upper fixing holes 311 and 201b aligned with the right angle members 20 and 20a so that the upward reaction force band 30 and the left and right angle members 20 and 20a Can be suppressed.

<Dismantling of tightening means>

Thereafter, it may further have a step of dismantling the tightening means 40, 40a.

That is, after the tightening bolts 43 are released, the bolt support 41 on the side of the angle member and the bolt support 42 on the opposite side of the upward reaction force are connected to the left and right angle members 20, 20a, So that the tightening means 40 and 40a can be dismantled.

On the other hand, in the present embodiment, the upper surface of the pair of upper horizontal members 37, 37a may be laminated to the bottom surface of the slab 5 by stacking as many shim plates 39 as necessary.

In this embodiment, the angle member pivot brackets 14 and 14a, the angle members 20 and 20a, and the upward reaction force band 30 are connected in this order and then tightened. In another embodiment, the pivot brackets 14, 14a, the angle members 20, 20a, and the upward reaction force band 30 may be formed as one assembly and then subjected to a tightening step.

In the present invention, the above-described pair of angle members 20 and 20a and the upward reaction force band 30 disposed between and connected to the pair of angle members 20 and 20a are reversed upward to introduce a prestress into the slab However, it can be used as a device for introducing a prestress in other structures.

As described above, according to the present invention, since the upward force of the upward reaction force band 30 is caused by the tightening force to introduce the prestress so that the upward force is maintained, it is possible to reinforce the new and old structures and restore deflection and deformation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

14,14a: Angle member pivot bracket
20, 20a: Angle member
30: Upward Reaction Force
31,31a: upper pivot bracket
32, 32a: vertical member
33,33a: lower pivot bracket
34: Lower horizontal member
35,35a: workpiece
36: Upper plate
37, 37a: upper horizontal member

Claims (10)

(a) fixing and installing angle member pivot brackets (14, 14a) on opposite sides of the structure;
(b) connecting one end of each of the angle members (20, 20a) to the pivot brackets (14, 14a) by pivot (P1, P1);
(c) Arranging the upward reaction force band 30 located below the structure between the two side-face angle members 20 and 20a, the upper side reaction force band 30 is mounted on both sides of the side face angle members 20 and 20a (30) by connecting the upper and lower side members (20, 20a) with pivot (P2, P2) on the upper side of the side surface;
(d) By performing the inversion operation of vertically moving the upward reaction force band 30 upward while rotating the both side angle members 20 and 20a with the fastening means 40 and 40a, And applying an upward force to the reinforcing member. The method according to claim 1,
After the step (d), bolts B1 are inserted into a plurality of lower fixing holes 331 and 201a, which are aligned with the lower pivot brackets 33 and 33a of the upward reaction force band 30 and the left and right angle members 20 and 20a, (Or pins) of the left and right angle members 20 and 20a, respectively, thereby restricting the return operation of the upward reaction force band 30 and the left and right angle members 20 and 20a. The method according to claim 1,
After the step (d), bolts B2 are inserted into a plurality of upper fixing holes 311 and 201b, which are aligned with the upper pivot bracket 31,31a of the upward reaction force band 30 and the left and right angle members 20 and 20a, (Or pins) of the left and right angle members 20 and 20a, respectively, thereby restricting the return operation of the upward reaction force band 30 and the left and right angle members 20 and 20a. The method according to claim 1,
Further comprising the step of dismantling the fastening means (40, 40a) after the step (d). The method according to claim 1,
Wherein the two side angle members (20, 20a) have a right triangle or an isosceles triangle shape. The method according to claim 1,
The upward reaction force band (30)
A pair of upper pivot brackets (31, 31a) connected to pivots (P2, P2) on the other end upper side of the angle members (20, 20a);
A pair of vertical members (32, 32a) having upper ends connected to the pair of upper pivot brackets (31, 31a) by pivots (P3, P3);
A pair of lower pivot brackets (33, 33a) connected to the lower ends of the pair of vertical members (32, 32a) by pivots (P4, P4), respectively;
A lower horizontal member (34) having both ends fixedly connected to the pair of lower pivot brackets (33, 33a);
A pair of lower pivot brackets (33, 33a) one end of which is fixedly connected to the lower horizontal member (34) at a predetermined angle;
An upstanding support plate (36) fixed to the other end of the work piece (35,35a);
And the slot 371 is fixed to the pair of upper pivot brackets 31 and 31a at one end and the slot 371 is fixed to the upper pivot bracket 31 and 31a, And a pair of upper horizontal members (37, 37a) connected to the upper horizontal member (37, 37a). The method according to claim 1,
The tightening means (40, 40a)
An angle member side bolt support 41 which is positioned in the section where the tightening angle? Is generated and which is fixed to the left and right side angle members 20 and 20a;
An upward reaction force side bolt support (42) spaced apart from the angle member side bolt support (41) and fixed to the side of the upward reaction force arm (30);
And a tightening bolt (43) supported at one end of the bolt support (41) on the side of the angle member and the other end supported on the bolt support (42) side of the upper reaction force side. . The method according to claim 1,
Wherein the reversing operation is performed by further laminating the shim plate (39) at the upper end of the upward reaction force band (30) in the step (d). A pair of angle members (20, 20a) which are rotatably supported by pivots (P1, P1) at one end on the opposite structure;
And an upward reaction force band (30) arranged in a pivotal relationship (P2, P2) between the pair of angle members (20, 20a);
The upward reaction force band (30)
A pair of upper pivot brackets (31, 31a) connected to upper ends of the pair of angle members (20, 20a) by pivots (P2, P2);
A pair of vertical members (32, 32a) whose upper ends are connected by pivots (P3, P3) to a pair of upper pivot brackets (31, 31a);
A pair of lower pivot brackets (33, 33a) connected to the lower ends of the pair of vertical members (32, 32a) by pivots (P4, P4);
A lower horizontal member (34) having both ends fixed to a pair of lower pivot brackets (33, 33a);
A pair of workpieces (35, 35a) once fixedly connected to the pair of lower pivot brackets (33, 33a); And
And an upstanding support plate (36) fixedly connected to the other end of the pair of workpieces (35,35a) and positioned at the upper center of the lower horizontal member (34). 10. The method of claim 9,
The upward reaction force band 30 has a pair of upper pivot brackets 31 and 31a and a plurality of slot holes 371 at the other end and fastening bolts 38 fixed to the upward facing plate 36, And a pair of upper horizontal members (37, 37a) connected by inserting between the slot hole (371) and the slot hole (371).

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