JPH0243468A - Method for removing part of concrete structure - Google Patents

Abstract

PURPOSE:To easily remove an upside portion by expanding an expanding member embedded along the boundary face between the upside portion and a downside portion to separate a structure body up and down, and giving an upwardly hauling tensile force to the upside portion and lifting up same. CONSTITUTION:An expanding member 33 is embedded along the boundary face between the upside portion 12 to be removed and a downside portion 10 to be left as it is. Then, a portion which is weaker than other portions with respect to the force in the separating direction is formed in each reinforcing bar passing through this boundary face. The expanding member 33 is expanded, the reinforcing bars are broken in their weak portions, and a concrete structure is separated to the upside portion 12 and the downside portion 10. Then, by such a method as to drive the external thread portion 40 of a hole-in-anchor into the upside portion 12 and to haul same by means of a crane via an engaging member 4, and the like, a tensile force is given to the upside portion 12 to lift same upward and remove same.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method for removing a part of a concrete structure.

[Prior Art] The inventor of the present invention proposed a method for removing a portion of a concrete IJ-containing construct as shown in Japanese Patent Publication No. 15427/1983. In this method, when constructing a concrete structure, an expansion member that can exert a force to expand and separate the upper part and the remaining lower part by an external operation along the interface between the upper part to be removed later and the lower part to be left. is buried, and a part is formed which is weaker than other parts against the force in the direction of separating the reinforcing bars passing through the boundary surface almost in the vicinity of the boundary face, and the expansion member is expanded to remove the weak part of the reinforcing bars. The upper part is removed without noise by destroying it.

In this method, when the inflation member is inflated, the upper part is separated from the lower part, but it is very difficult to easily lift and remove it.

[Problems to be Solved by the Invention] The present invention provides a method that solves these problems and allows the upper portion to be easily removed.

[Means for Solving the Problems] When constructing a concrete structure, the present invention expands by an internal operation along the interface between the upper part that will be removed later and the lower part that remains, and expands the upper part of the concrete structure. An expansion member capable of exerting a force to separate the section from the lower section is embedded, and the reinforcing bars passing through the boundary surface are weaker than other parts in the direction of separation near the boundary surface. A method for removing a part of a concrete structure by forming a part and expanding the expansion member to destroy a weak part of the reinforcing steel, the upper part to be removed when the part of the concrete structure is removed. The present invention provides a method for removing a part of a concrete structure, characterized in that the part of the concrete structure is removed by engaging with the concrete structure and applying a tensile force from above.

[Operation When removing the upper part of a co-concrete structure, the expanding member is expanded and engaged with the upper part to apply a tensile force from above, and the separated upper part is lifted upward by the expanding member and removed very easily.] be able to.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention shown in FIGS. 1 to 4,
Reference numeral 10 denotes a floor slab made of concrete that serves as the lower part, and is arranged with appropriate spacing 11 so that the spacing 11 can be changed by expanding and contracting due to temperature and temperature, and the end is notched from above. It's dark. Reference numeral 12 designates a reinforcing portion made of concrete, which is the upper portion formed in the cutout portion of the end portion of the floor slab 10, and reference numeral 13 represents an expansion joint installed between the reinforcing portions. This expansion joint has a rubber member 17 which has a metal plate 15 embedded therein and expandably covers the upper part of the spacer 11, and has an anchor bolt 18 extending therethrough.

Reference numeral 20 denotes a reinforcing bar assembly that is connected to the floor slab IO and placed within the reinforcing section 12, and is constructed as described below. That is,
Reference numeral 21 denotes a female screw member of a hole-in anchor that is fixed by drilling a hole from the upper surface of the floor slab 10 and driving it into place. If necessary, when constructing the floor slab 10 instead of a hole-in anchor, a long nut called a high nut may be buried as the female thread member 21. 22 is a reinforcing bar, and a cylindrical portion 23 is formed at the bottom thereof. A screw member 27 that can be screwed into the female screw member 21 is inserted into this cylindrical portion and fixed with an adhesive 2.6. The reinforcing bars 22 are formed by screwing a threaded member 27 onto the female threaded member 21, bending the reinforcing bars 27, and connecting the reinforcing bars 22 to opposing parts by welding or the like. 28 extends in the length direction of the expansion joint 13 and is a reinforcing bar 22.
The anchor bolt 18 extending from the expansion joint 13 is welded with a plurality of reinforcing bars welded to the expansion joint 13. In the reinforcing bar assembly 20 configured in this manner, the area between the reinforcing bars 22 fixed with the adhesive 26 and the screw member 27 constitutes a portion that can withstand compressive force but is weak against tensile force.

However, since the tensile force does not normally act, no problem occurs.

Reference numeral 30 denotes an engaging member made of iron used to remove the reinforcing portion 12, and for example, two reinforcing bars 2 are attached to the area to be removed at one time.
It is welded to 8. Reference numeral 31 indicates the position of this engaging member, and is made of a bendable material such as synthetic resin or rubber, and is different in color from the concrete of the reinforcing part 12 in which it is buried, and the surface of the reinforcing part 12 is Even if it wears out, it can always be displayed.

Reference numeral 33 is a flat metal cylindrical body, which is arranged on the upper surface of the floor slab 10 for each area to be removed at one time, and when removing the reinforcing part 12, pressurized liquid is supplied to expand and separate the reinforcing part 12. It is an expansion member that allows 35 is a paving section.

In the configuration as described above, when the expansion joint 13 is replaced, the reinforcing portion 12 is also often removed and reconfigured. In such a case, the engaging member 30 is dug out according to the display on the display member 31.

Subsequently, both ends of the expansion member 33 are dug out, and a pressurized liquid such as water is supplied from one end, and then the other end is pressurized. In this state, the engaging member 30 is tied with a wire rope 36 or the like, and the hook 39 of the crane 38 is engaged, and the crane 38 pulls the engaging member 30 upward and lifts it, thereby making it possible to easily carry out the entire reinforcing portion 12.

In this invention, as shown in FIG. 5, the female screw member 40 of the hole-in anchor is inserted into the upper surface of the reinforcing part 12 by drilling a hole in the upper surface of the reinforcing part 12 and screwing it into the hole, without burying the engaging member 30 made of reinforcing bar. Alternatively, an engaging member 41 having a threaded portion may be attached to engage the hook 39 of a crane to lift and carry the object. Alternatively, instead of providing the engaging member 30 made of a hanging reinforcing bar, for example, the upper part of the reinforcing bar 22 at an appropriate position may be indicated by the display member 31, and the reinforcing bar 22 itself may be used as the engaging member to apply a tensile force. good. In addition, in order to form a part that is weak against tension in the reinforcing bar assembly 20, as shown in FIG. A small diameter portion 47 may be formed so that this portion is destroyed when a tensile force is applied. In addition, a seventh
As shown in the figure, the heating element 50 is placed in the synthetic resin part 5 in the container 48.
1 and covered with a lid 52, a suitable number of them are provided.
When removing the reinforcing portion 12, electricity is passed from the electric wire 53 to the heating element 50 to generate heat, causing the synthetic resin portion 51 to expand and removing the reinforcing portion 12.
may be separated from the floor slab 10 and lifted. Furthermore, the present invention can also be practiced in areas other than those in which expansion joints are installed, such as the concrete pavement of a road and its lower structure, as the upper and lower parts.

[Effects of the Invention] As described above, in this invention, the expansion member 33 engages the upper part of the concrete structure in a separated state and lifts and removes the upper part by applying a tensile force from above. This has the effect of making removal significantly easier.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a vertical side view of the expansion joint installed, FIG. 2 is a sectional view showing some details, and FIG. 3 is a side view of the expansion joint. 4th plan view showing the state where the concrete IJ-t and expansion joint of the section have been cut out and removed.
The figure is a front view showing a state in which the upper part is removed. Fifth
7 to 7 are explanatory diagrams showing different embodiments of the present invention. 1O... Floor slab serving as the lower part, 12... Reinforcement part serving as the upper part, 13... Expansion joint, 2°... Rebar assembly, 26... Adhesive, 3o... Engagement member, 31...
-Display member, 33... expansion member, 41... engagement member.

Claims (1)

[Claims] 1. When building a concrete structure, the upper part of the concrete structure is expanded by an internal operation along the interface between the upper part that will be removed later and the lower part that remains, and the upper part of the concrete structure is moved downward. An expansion member capable of exerting a force to separate the reinforcing bars from the boundary surface is embedded, and a portion is formed that is weaker than other portions to the force in the direction of separating the reinforcing bars passing through the boundary surface. The method includes: removing a part of the concrete structure by expanding the expansion member to destroy the weak part of the reinforcing steel; A method for removing a part of a concrete structure, characterized by applying tensile force from above to lift and remove. 2. The method according to claim 1, in which an engaging member is buried in concrete when forming the upper portion, and the engaging member is flexible enough to display its position from the surface of the concrete, and is displayed in a color different from that of the concrete. Bury the parts,
When removing a part of a concrete structure, a method characterized in that an engaging member is exposed based on the position of the display member, engaged with a hook or the like, and pulled upward by a crane or the like. 3. The method according to claim 1, when removing a part of the concrete structure, a hole-in anchor is driven from the surface of the concrete in the upper part, and a hook or the like is engaged with an engaging member connected to the hole-in anchor. A method characterized by pulling the device upward using a crane or the like.