JP2007255082A - Method of boring continuous groove in reinforced concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rapidly and efficiently bore a continuous groove by efficiently combining reinforcement part cutting with a wall saw and impact boring with an SD machine in partially demolishing/removing a reinforced concrete structure 1. <P>SOLUTION: The arranged positions of reinforcements 3 are detected beforehand, and two rows of continuous slits 6a, 6b are bored with the wall saw 10 from the surface 2 of the reinforced concrete structure to a part deeper than the detected disposed positions of the reinforcements along ridgelines 4a, 4b on both sides of the continuous groove of predetermined width to be bored. Each reinforcement is separated at two parts, and the inside of a region between the two rows of slits is hacked from the surface of the reinforced concrete structure to form the shallow continuous groove of predetermined width. Further, the continuous groove 7 of predetermined depth is bored with the impact boring machine 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for drilling continuous grooves in a reinforced concrete structure, and more particularly to a method for drilling continuous grooves in the case of disassembling and removing a part of a reinforced concrete structure.

  Renewal construction of reinforced concrete (RC) structures is increasing. In such construction, only a part of the RC structure is dismantled and removed. In this case, it is often required to dismantle and remove only a part of the RC structure without damaging the part of the RC structure that remains without being removed. At the time of construction, a method should be adopted in which a continuous groove is provided at the boundary between the part to be dismantled and removed and the part to be left is cut off so that the part to be left is not damaged and removed without damage. There are many.

  As means for drilling continuous grooves, hitting continuous groove drilling machines (hereinafter referred to as slot drill machines or SD machines), core drills, concrete cutters (wall saws) and the like are generally known. However, when using these continuous groove drilling machines for RC structures composed of highly tough reinforcing bars and hard but brittle concrete parts, there are the following problems.

  The SD machine has a mechanism for crushing concrete and rocks into small pieces by drilling and rotating rods and bits with a hydraulic drill. It is the striking action that contributes mainly to the drilling, and the object is pulled and broken by the striking. The rotation mainly serves to change the striking position. The bit attached to the tip of the rod has a shape in which a cemented carbide chip is embedded in a cross shape or a button shape, and is made of a material and shape suitable for hitting and crushing concrete and rock. Such a drill or bit mechanism is suitable for drilling a brittle material such as rock or concrete, that is, a material having a lower tensile strength than the compressive strength.

  Conventionally, there are many cases in which slots are drilled in concrete using the SD machine as described above. Under such circumstances, when a reinforcing bar is encountered during drilling or when drilling is continued, the reinforcing bar or hardware is hit and deforms due to its ductility, and the drilled groove It clings to the bottom and the peripheral wall, making it difficult for the bit and rod to rotate, resulting in a state where it becomes impossible to drill the groove.

  In addition, a method of attaching a rebar cutting bit to an SD machine and mainly rotating it to cut the rebar part has been tried, but at present, there is a problem that it takes time for drilling and the bit is consumed much. is there.

  As described above, the SD machine has a high construction efficiency in the drilling of the concrete part, and hence the construction speed is fast and can be constructed at low cost, but the drilling of the reinforcing bar part is difficult.

  On the other hand, the core drill performs cutting by pressing a cylindrical rod embedded with diamond powder or special metal tip at the tip while rotating at high speed in a direction perpendicular to the plane of the object to be cut. Cutting of the reinforcing bars is also possible, but the cutting efficiency is low, that is, the cutting speed is slow and the cost is high.

  As a solution to the above problems, there is a method in which a continuous groove is drilled in an RC structure by cutting and removing only a reinforcing bar portion with a core drill and striking another portion (concrete portion) with an SD machine. 1 (Japanese Patent Laid-Open No. 61-1558569).

  In this patent document 1, since the drilling means suitable for the characteristics of the brittleness of concrete and the toughness of the reinforcing bar is used, the reinforced concrete can be dismantled, but since the core drill is used as described above, Cutting takes time, especially when continuous grooves are drilled.

Japanese Patent Application Laid-Open No. 61-1558569

  In general, a reinforced concrete (RC) structure is often provided with a reinforcing bar in the vicinity of the concrete surface. In particular, a thick reinforced concrete wall or mass concrete is often arranged only on the surface portion.

  In the present invention, paying attention to this point, in order to solve the above-mentioned problem, by efficiently (rationally) combining the rebar cutting with a concrete cutter (wall saw) and the striking hole with the SD machine, Specifically, after forming the two narrow grooves first, the upper and lower surfaces of the formed deep grooves can be smoothed by striking between the narrow grooves, and the subsequent winding of the wire saw A method for drilling a continuous groove in an RC structure that can be smoothly and efficiently disassembled and removed without damaging the parts to be left. It is to provide.

  In order to achieve the above object, according to the present invention, there is provided a method of drilling a continuous groove in an RC structure, in which a) a step of previously detecting an arrangement position of a reinforcing bar, and b) a predetermined to be drilled Drilling two continuous narrow grooves with a wall saw from the surface of the reinforced concrete structure along the ridges on both sides of the width continuous groove to a deeper position than the detected position of the reinforcing bar, C) cutting the rebar at two points; c) scraping the area between the two narrow grooves from the surface of the reinforced concrete structure so that the rebar in the area corresponding to the predetermined width and the surrounding concrete Forming a shallow continuous groove having a predetermined width, and d) forming a continuous groove having a predetermined depth by a striking punch using the shallow continuous groove as a guide. A method for drilling continuous grooves in an RC structure is provided.

  As described above, in the present invention, when the RC structure is disassembled, the surface reinforcing bar portion is cut in advance at two locations with a wall saw, and two narrow grooves are formed in the concrete portion. By removing the area between the narrow grooves by scraping the concrete, the continuous grooves including the reinforcing bars are formed, so the continuous grooves are efficiently formed for the RC structure arranged on the surface. can do.

  In this case, at the stage where the arrangement position of the reinforcing bars is detected in advance, at least the depth and the planar direction of the reinforcing bars from the surface of the reinforced concrete structure are detected. Moreover, in the stage which detects the arrangement position of a reinforcing bar beforehand, it detects by scraping off the concrete surface of several places, non-contact search by a design drawing, electromagnetic waves, etc.

  In the stage where the area between the two narrow grooves is scraped from the surface of the reinforced concrete structure to form a shallow continuous groove with a predetermined width, it is preferable to use an impact drilling machine such as an SD machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a procedure for drilling continuous grooves in a reinforced concrete (RC) structure according to the present invention, drilling two continuous narrow grooves with a wall saw and scraping the concrete with a hammer drilling machine. Each stage of work and drilling of a continuous groove of a predetermined depth by the percussion drilling machine is shown in one figure. FIG. 2 shows a state in which a reinforcing bar on the surface is cut by a wall saw, and FIGS. 3 and 4 show a state of drilling by an impact punching machine (SD machine).

  In these drawings, 1 is an RC structure, 2 is a concrete surface thereof, and 3 is a reinforcing bar disposed near the surface inside the concrete. Here, the region indicated by reference numeral 5 below the boundary line 4a on the concrete surface is the part to be dismantled / removed, and after forming the two narrow grooves 6a and 6b for cutting each rebar 3 at two locations, continuous grooves (Deep groove) 7 is formed, and then the reinforced concrete of the part 5 to be dismantled / removed is dismantled / removed.

  In FIG. 1, the depth from the concrete surface 2 to the position where the reinforcing bar 3 is disposed is D1, the depth of the narrow grooves 6a and 6b is D2 (D1 + α), the depth D3 of the deep groove 7, and the depth of the deep groove 7 A predetermined width W is assumed. Note that a plurality of reinforcing bars 3 are arranged in parallel at a portion having a predetermined depth D1 that is relatively close to the concrete surface 2, and continuous grooves (deep grooves) 7 are formed in a direction perpendicular to the direction in which the reinforcing bars 3 are arranged. Shall be formed.

  First, although not shown in the drawing, a continuous groove is formed in the reinforced concrete structure, and the rebar 3 from the surface 2 of the reinforced concrete structure 1 is arranged in advance before disassembling the structure. Reinforcing bars 3 in a plane parallel to the depth D1 and the concrete surface 2 detect the arrangement direction up to the position. The detection is performed by a method using a design drawing at the time of construction, a non-contact exploration method using electromagnetic waves or the like, a method of measuring the depth and direction of a reinforcing bar by scraping several concrete surfaces, and a method combining these.

  Next, the reinforcing bar on the surface is cut with a wall saw having a disk cutter. In FIG. 1, ridgelines 4a and 4b on both sides of a continuous groove (deep groove) 7 having a predetermined width W to be drilled, that is, a boundary line 4a between a portion of the concrete surface 3 that is not to be dismantled and a portion 5 to be dismantled and removed, and this boundary Two continuous narrow grooves 6a and 6b are formed by the disk cutter 11 of the wall saw 10 (FIG. 2) along two parallel straight lines of the ridge line 4b separated by a predetermined width W from the line 4a.

  The formation of the narrow groove 6 by the wall saw 10 and the cutting operation of the reinforcing bar 3 are shown in FIG. The guide rail 12 of the wall saw 10 is fixed in a direction parallel to the concrete surface 2 and perpendicular to the reinforcing bar 3. A frame 14 is attached to the guide rail 12 so as to be movable in the direction of arrow X along the guide rail 12 in parallel with the concrete surface 2. A disk cutter 11 that is rotationally driven by a drive motor 13 is attached to the frame 14 so as to be movable in the arrow Y direction in the vertical direction and in the horizontal direction in FIG.

  The disk cutter 11 is a steel disk having an industrial diamond or the like attached to the outer periphery. The disk cutter 11 is rotated at a high speed, and D2 deeper from the concrete surface 2 by α than the arrangement depth D1 of the reinforcing bar 3, that is, the reinforcing bar 3 Is pushed into the RC structure 1 to a position where it can be sufficiently cut, and the frame 13 is moved along the guide rail 12 so that it has a width corresponding to the cutter thickness of the disk cutter 13 and a reinforcing bar. 3 and a narrow groove having a depth of about 10 cm is formed. After drilling one narrow groove 6a, the installation position of the wall saw 10 is changed by a dimension corresponding to a predetermined width of the continuous groove, and another narrow groove 6b is drilled. Thereby, each reinforcing bar 3 is cut | disconnected and edge-cut at the position of two places.

  Next, a continuous groove 7 having a predetermined width W is drilled adjacent to the narrow groove 6 using an impact drilling machine (SD machine) 20 shown in FIGS. 3 and 4.

  In FIG. 3, the guide cell 22 of the SD machine 20 is fixed and held in a direction perpendicular to the concrete surface 2. That is, the guide cell 22 is arranged on the upper side of the holding frame 24 with the jack arranged in parallel with the guide cell 22, and the holding frame 24 with the jack is disposed along the front and rear guide portions 24 a and 24 b of the holding frame 24 with the jack. It is held so as to be slidable in parallel (arrow E). And the guide cell 22 moves in parallel with respect to the holding frame 24 with a jack, when the jack part 24c is driven and expands-contracts. On the other hand, a horizontal shaft 30 and a jack 32 extending from the lower end of the arm 28 are arranged at the upper end of an arm 28 which is vertically erected in a vertical direction so as to be rotatable at the tip of the fixed frame 26 held substantially horizontally by means not shown. The rear end portion and the front end portion of the holding frame 24 with the jack are pivotally attached to the free end. Accordingly, the guide cell 22 can be set at a desired angle position by the rotation of the arm 28 (arrow C) and the operation of the jack 32 (arrow D).

  That is, when the jack 32 is driven to expand and contract, the holding frame 24 with jack holding the guide cell 22 is rotated about the horizontal axis 30, and the holding frame 24 with jack and the guide cell 22 are moved to the concrete surface 2. Set it at a right angle to it. The front end portion of the guide cell 22 is fixed to the concrete surface 2 by a fixing member 32.

  On the upper side of the guide cell 22, a perforated rod 34 is arranged in parallel with the guide cell 22. The perforation rod 34 is guided by a guide portion 22a whose front end is fixed to the upper front end of the guide cell 22, and its rear end is installed on the front upper end of the guide cell 22 so as to be movable in the front-rear direction. It is mounted on a drifter 40 installed on a table 38.

  A piercing bit 36 is attached to the front end of the piercing rod 34. When the drifter 40 is driven, the piercing rod 34 and the piercing bit 36 are rotated (arrow F), and an impact is given to the region between the two narrow grooves 6a and 6b of concrete. Further, when the drifter 40 is moved forward by the moving table 38, the drilling rod 34 and the drilling bit 36 move forward (arrow G), and the concrete scraping operation proceeds.

  After starting the perforation drilling by the SD machine 20 in the area between the two narrow grooves 6a, 6b from the concrete surface 2 of the RC structure 1, when the rebar 3 is hit and rotated from the time when the drill bit 36 hits the rebar 3 The surface of the reinforcing bar is partly cut by striking rotation. The cut part of the reinforcing bar 3 is denoted by reference numeral 3c in FIG.

  The portion around the reinforcing bar of the concrete 1a is destroyed by hitting the perforated bit 36, cut by the two narrow grooves 6a and 6b, and the reinforcing bar portion 3b cut from the main portion 3a of the reinforcing bar 3 is free at both ends. Thus, it is possible to easily remove the main portion 3a of the reinforcing bar 3 without hitting it directly, as if the breaker action by the breaker.

  The concrete on the back surface of the rebar portion 3b that is edge-cut is also destroyed by the impact force of the drill bit 36 being transmitted through the rebar portion 3b while the load is repeatedly applied to the rebar portion 3b. Is formed.

  In this manner, after breaking the reinforcing bar portion 3b, the SD machine is moved along the area between the two 4a and 4b, and further drilling is performed by the striking rotation by the drill bit 36 to destroy the reinforcing bar. While removing, a relatively shallow continuous groove having a predetermined width is formed. After forming the slot-like continuous groove in this way, the continuous groove 7 having a predetermined depth is drilled using the same SD machine. After piercing one continuous groove (deep groove) 7, the same operation by the SD machine is repeated to remove the reinforced concrete in the part 5 to be dismantled and removed. When the continuous groove 7 having a predetermined depth is formed, the two rows of narrow grooves 6a and 6b and a groove having a predetermined width W formed as a space between the narrow grooves 6 are drilled in the concrete portion by the SD machine. It can be made to function as a guide wall in the plane direction and the depth direction for accurately performing the above.

  Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various forms, modifications, corrections, and the like are possible within the spirit and scope of the present invention. It is. For example, in the above-described embodiment, the concrete scraping operation in the region between the two rows of narrow grooves 6a and 6b is performed using the SD machine similar to the case of forming the continuous groove 7 of the deep groove. It is also possible to use a means such as a machine that repeatedly applies only the striking force.

  As described above, according to the present invention, for a reinforced concrete structure in which reinforcing bars are arranged near the surface, two thin grooves are formed by a wall saw and the reinforcing bar portion is cut, The concrete area between the narrow grooves is scraped off by a lifting operation, and then a continuous groove is formed by an SD machine, so it is efficient for reinforced concrete structures consisting of highly tough reinforcing bars and hard but brittle concrete parts. Continuous grooves can be formed, and an economical and efficient RC structure can be disassembled.

  Further, according to the present invention, it is possible to surely dismantle only the required dismantling / removal target part of the RC structure.

1 shows a method for drilling continuous grooves in a reinforced concrete structure according to the present invention. It is a top view which shows the cutting state by a wall saw. It is a side view which shows the state of the scraping and drilling by a striking punch (SD machine). The breaking situation of the rebar part by the scraping work is shown.

DESCRIPTION OF SYMBOLS 1 Reinforced concrete (RC) structure 2 Concrete surface 3 Reinforcing bar 3a Reinforcing bar main part 3b Reinforced part 3c cut part 4a, 4b Ridge line 5 Dismantling / removal target part 6a, 6b Narrow groove 7 Deep groove (continuous groove)
10 Wall saw 11 Disc cutter 20 Blow drilling machine (SD machine)
36 Drilling bit

Claims (4)

A method of drilling continuous grooves in a reinforced concrete structure,
a) detecting the arrangement position of the reinforcing bars in advance;
b) Two narrow grooves continuous with a wall saw from the surface of the reinforced concrete structure along the ridges on both sides of the continuous groove having a predetermined width to be drilled to a site deeper than the detected position of the reinforcing bar Drilling and cutting each rebar at two points;
c) The inside of the region between the two narrow grooves is scraped from the surface of the reinforced concrete structure to remove the reinforcing bar in the region corresponding to the predetermined width and the surrounding concrete, and the shallow continuous groove having the predetermined width. Forming a stage;
and d) drilling a continuous groove having a predetermined depth with a percussion drilling machine using the shallow continuous groove as a guide, and a method for drilling a continuous groove in a reinforced concrete structure.   2. The continuous groove drilling method according to claim 1, wherein in the step of detecting the position of the reinforcing bar in advance, at least the depth and the planar direction of the reinforcing bar from the surface of the reinforced concrete structure are detected.   2. The continuous groove drilling according to claim 1, wherein in the step of detecting the position of the reinforcing bar in advance, the detection is performed by non-contact exploration using a design drawing, electromagnetic waves, or the like, and scraping off several concrete surfaces. Method.   2. The continuous groove drilling method according to claim 1, wherein an impact drilling machine is used at the stage of scraping the inside of the region between the two narrow grooves from the surface of the reinforced concrete structure.

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