JPH0742844U - Removal device for expansion joint reinforcement - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Good removal of reinforcements for expansion joints such as river bridges and elevated roads. [Structure] Reinforcing bars 30 and 36 passing through the boundary where the reinforcement for expansion joints such as river bridges and elevated roads are to be removed have a weak portion for pulling and the floor slab 10 of the reinforcement 11 is formed.
In the case where the flat pipe 31 is buried near the boundary between the flat pipe and the flat pipe, the pressurized liquid is supplied to the flat pipe to expand it and the reinforcing portion 11 is removed. The extending reinforcing bar is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for removing a reinforcing portion for an expansion joint.

[0002]

[Prior art]

 Conventionally, expansion joints are used at seams in river bridges and elevated roads to absorb expansion and contraction due to cold weather. To install this expansion joint, it is usual to cut out the upper surface of the floor slab to form a reinforcing part made of concrete, etc., but when replacing the expansion joint, it is necessary to remove the reinforcing part. . In order to be suitable for such a case, the planner has formed a weak portion for pulling in the connecting portion of the reinforcing bar as shown in Japanese Patent Publication No. 63-15427, and flattened near the boundary between the floor slab and the reinforcing portion. We proposed a method of installing a pipe and supplying a pressurized liquid into the flat pipe to expand it when the expansion joint is replaced, to easily separate the reinforcing part. However, there were many problems such as how to install the flat pipe for practical use.

[0003]

[Problems to be solved by the device]

 The present invention provides a highly practical removal device for expansion joints that can be used in such cases.

[0004]

[Means for Solving the Problems]

 This device is designed to form a weak part in tension in the reinforcing bar passing through the boundary to be removed by the removal device of expansion joints for expansion bridges such as river bridges and elevated roads. In a case where a flat pipe is buried and pressurized liquid is supplied to the flat pipe to expand it and remove the reinforcing portion, rebars extending in the direction crossing the flat pipe are arranged above and below the flat pipe at appropriate intervals. The present invention provides a device for removing a reinforcing portion for an expansion joint, which is characterized in that

[0005]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In the embodiment of the present invention shown in the drawings, 10 is a concrete floor slab, 11 is a reinforcement made of concrete or the like formed by cutting out the end of the floor slab, and 13 is a stretchable member. A joint, 14 is a pavement part. Reference numeral 15 is a reinforcing bar extending from the floor slab 10, and 16 is, for example, two supporting members connected to the reinforcing bar and arranged substantially horizontally. The support member 16 may have three or more pieces, or may have one piece, for example, formed in a U shape.

Reference numeral 17 denotes a separating device having a connecting member 18, which has a small-diameter portion 19 formed at an upper portion and a tubular portion 20 having a circular cross section formed at a lower portion. A circular hole 21 opened downward is formed in the portion. The connecting member 18 can be simply constructed by, for example, cutting a round bar. A rectangular head 23 of a bolt 22 is inserted into the hole 21 of the connecting member 18 and integrally connected by a connecting member 24 such as an epoxy resin to form a separating device 17. This separating device 17 is capable of separating the bolt 22 from the connecting member 18 by breaking the connecting member 24 when pulled with a large force. The separating device 17 is manufactured in the factory and is screwed into the supporting member 16 to separate the bolt 22. The device 17 is adapted to be held in place. An appropriate number of separating devices 17 are usually attached to each supporting member 16.

Reference numeral 26 is a rebar connected to the upper portion of the connecting member 18, 27 is a rebar connected to the rebar 26, and 28 is an anchor bolt extending from the expansion joint 13 and connected to the rebar 27. A plurality of reinforcing bars 30 are arranged on the supporting member 16 at appropriate intervals in a direction traversing the supporting member, and are fixed to the supporting member 16 by, for example, spot welding or wire (not shown). Reference numeral 31 denotes a U-shaped flat pipe which is arranged on the rebar 30 and fixed by, for example, a wire (not shown). First, a stainless steel pipe having a circular cross section with an outer diameter of 20 to 50 mm and a thickness of 1 to 5 mm is U-shaped. It is formed and flattened by rolling on both sides by means of rolls, for example, and narrowed openings 33 are provided at both ends. Reference numeral 35 is a closing member which is made of rubber or the like and closes the opening 33. The opening 33 closed by the closing member 35 is bent upward so that the end surface of the closing member 35 is exposed on the surface of the reinforcing portion 11. Reference numeral 36 designates, for example, the same number of reinforcing bars as the reinforcing bars 30, which are arranged on the flat pipe 31 in a direction traversing the flat pipe 31 and fixed by a wire or the like not shown.

Reference numeral 37 denotes a lifting attachment member to which the lifting engagement member 90 is attached when the reinforcing portion 11 is removed, and has a screw hole 38 carved from the upper surface, and an embedded object 40 such as rubber is embedded therein. It is exposed on the surface of the reinforcing portion 11. It is necessary to provide at least one attachment member 37 for the reinforcing portion 11 to be removed at a time. Each of the mounting members 37 is fixed to the reinforcing bar 27, for example. With all the reinforcing bars and the like arranged as described above, concrete reinforcement is used to form the reinforcing portion 11, and the expansion joint 13 is attached using the anchor bolt 28. In FIG. 5, reference numeral 50 designates a ground covering expansion joint arranged near the balustrade 51, and a sheet member 52 composed of concrete or other foreign material is embedded in the concrete boundary portion of the reinforcing portion adjacent to the expansion joint 13. There is.

For example, when the expansion joint 13 is replaced after being used for many years, the boundary surface 53 adjacent to another concrete portion of the reinforcing portion 11 is cut using a concrete cutter. In this case, it is not necessary to cut at the boundary surface where the sheet member 52 is embedded. The sheet member 52 may be provided along the boundary surface to be removed each time when the reinforcing portion 11 is removed in a plurality of times in the width direction of the road. In general, the ground cover expansion joint 50 is rarely replaced because the vehicle does not pass above it, and therefore it is particularly convenient to provide the seat member 52. Next, the vicinity of the closing member 35 that closes the opening 33 of the flat pipe 31 is dug up, a pressurized liquid such as water is supplied from the opening 33 at one end, and when the other end is reached, the opening 33 at the other end is closed. When the supply of the pressurized liquid is continued, the flat pipe 31 expands and the reinforcing portion 11 is lifted, the connecting member 24 of the separating device 17 is broken, the connecting member 18 is separated from the bolt 22, and the reinforcing portion 11 is lifted and the floor slab 10 is lifted. Will be separated. In this case, it is not necessary to search for the exposed blocking member 35, and the treatment can be performed easily. It was found that the cutting surface of the concrete portion of the reinforcing portion 11 would be cut so as to rise diagonally toward both sides if the illustrated reinforcing bars 30 and 36 were not provided, but the reinforcing bars 30 and 36 were provided. It was found that the concrete portion of the reinforcing portion 11 was cut from the flat pipe 31 in the horizontal direction.

The reinforcing member 11 can be removed by removing the embedded object 40 from the exposed surface of the mounting member 37, screwing the engaging member 90 into the screw hole 38, and pulling it up by a crane (not shown). I can. In such a case, if the upper surface of the mounting member 37 is exposed, it can be easily treated. When removing the reinforcing portion 11 and then installing the expansion joint 13 again, the bolt 22 of the separating device 17 is removed using a spanner or the like, and a new separating device 17 is installed on the remaining supporting member 16. The expansion joint 13 can be installed in the same manner by using the reinforcing bar 30 as it is and using other parts as new parts. In this case, if the bolt 22 has a square head 23, it can be easily rotated. Various modifications can be made in this invention. For example, the flat pipe 31 may be formed straight without forming the U-shape. Further, the lifting attachment member 37 may be provided with a hole for engraving a female screw without forming the screw hole 38. In such a case or when the screw hole 38 is rusted, a female screw may be engraved with a tap. Further, the lifting attachment member 37 may have a shape different from that shown, and the upper surface may be exposed on the surface of the pavement portion 11.

[0011]

[Effect of device]

 Since the present invention is configured as described above, it has an effect that it can be removed very well when the reinforcing portion 11 is removed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view showing a part thereof by cutting out.

FIG. 3 is a plan view showing a flat pipe with a part thereof cut away.

FIG. 4 is a plan view showing an arrangement of some reinforcing bars and the like.

FIG. 5 is a plan view showing a part of an installed state of the expansion joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Floor slab 11 Reinforcement part 13 Expansion joint 15 Reinforcing bar 16 Supporting member 17 Separation device 18 Connecting member 20 Cylindrical part 21 Hole 22 Bolt 23 Head 24 Connecting member 28 Anchor bolt 30 Reinforcing bar 31 Flat pipe 33 Opening part 35 Closing member 36 Reinforcing bar 37 Mounting member for lifting 38 Screw hole

Claims (1)

[Scope of utility model registration request] 1. A reinforcement weakening portion is formed in a reinforcing bar passing through a boundary to be removed by a reinforcement device for expansion joints of river bridges and elevated roads, and the boundary between the reinforcement and the floor slab is defined. In the case where a flat pipe is buried near the flat pipe and pressurized liquid is supplied to the flat pipe to expand the flat pipe, the reinforcing portions are removed, and reinforcing bars extending in the direction crossing the flat pipe are provided above and below the flat pipe at appropriate intervals. A device for removing a reinforcing portion for an expansion joint, which is arranged.