JP2013023921A - Method of dividing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently divide a concrete structure into a plurality of blocks with low noise and low vibration.SOLUTION: A method of dividing a concrete structure 1 which divides the concrete structure 1 into a plurality of blocks 2 includes: a groove formation step of forming a plurality of grooves 4 in the surface of the concrete structure 1 so as to be along outlines of the respective blocks 2; a hole formation step of forming a hole 14 in each at least one part of the groove 4; and a division step of generating a crack along each groove 4 by expanding each hole 14. Each groove 4 is formed by a water jet device, each hole 14 is formed by a low noise type concrete core drill, and the crack along each groove 4 is generated by expansion means, whereby work for diving the concrete structure 1 into the plurality of blocks 2 can be efficiently performed with low noise and low vibration.

Description

  The present invention relates to a method for dividing a concrete structure, and more particularly, to a method for dividing a low noise and low vibration concrete structure.

  As a method of demolishing a concrete structure such as a building, a method of demolishing by crushing concrete using a heavy machine is known. However, since such a method generates high noise and high vibration, urban areas, hospitals In areas where noise and vibration are restricted, such as schools and welfare facilities, applicable time zones are restricted.

  For this reason, a method of dividing a concrete structure into blocks by using a wall saw, a wire saw, or the like has been attracting attention. However, a disassembly method using a wall saw can sufficiently suppress noise and vibration. I can't. Moreover, although the disassembly method using a wire saw can sufficiently suppress noise and vibration, it requires a plurality of steps and therefore has poor work efficiency.

  In order to deal with the problems of noise, vibration, and work efficiency as described above, the inventors of the present application previously performed renewal work such as seismic reinforcement for an existing concrete structure. The removal method which removes the surface layer part (finished mortar layer etc.) laminated | stacked on the upper part by low noise and low vibration is proposed (refer patent document 1).

  In this removal method, a groove or a hole is formed so as to surround a portion to be removed of the concrete structure, a load applying hole is formed in at least one portion of the removal target portion surrounded by the groove or the hole, and the load applying hole is formed. The removal target part is configured to be removed from the concrete structure by applying a load in the direction of peeling from the concrete structure to the removal target part. According to the removal method having such a configuration, the portion to be removed can be removed from the concrete structure with low noise and low vibration.

  However, because it is a method of removing the removal target partly, the volume of the object such as a concrete block fixing a pipe such as water supply, a concrete foundation supporting various machines, a foundation beam, etc. It cannot be applied when a large concrete structure is divided into a plurality of blocks for dismantling.

JP 2010-216160 A

  The present invention has been made in view of the above-described conventional problems, and a concrete structure can be divided into a plurality of blocks with low noise, low vibration, and efficiency. It aims to provide a method.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a concrete structure dividing method for dividing a concrete structure into a plurality of blocks, and a plurality of grooves are formed on the surface of the concrete structure along the outline of each block. A groove forming step to form, a hole forming step of forming holes in at least one of the grooves, and a dividing step of generating cracks along the grooves by enlarging the holes. It is characterized by being.

  According to the method for dividing a concrete structure of the present invention, when dividing the concrete structure into a plurality of blocks, grooves are formed on the surface of the concrete structure along the outline of each block, and at least each of the grooves A concrete structure can be divided into a plurality of blocks by forming holes in one place and enlarging the holes to cause cracks along the grooves.

  Furthermore, in the present invention, the hole may be formed in each of the intersecting portions of the plurality of grooves.

  According to the method for dividing a concrete structure of the present invention, the concrete structure is divided into a plurality of blocks by enlarging the holes formed in each of the intersections of the plurality of grooves to cause cracks along each groove. Can be divided.

  Furthermore, in the present invention, the hole may be formed in the center of each of the plurality of grooves.

  According to the method for dividing a concrete structure of the present invention, the concrete structure is divided into a plurality of blocks by enlarging a hole formed at the center of each of the plurality of grooves to cause a crack along each groove. Can be divided.

  Furthermore, in the present invention, the plurality of grooves may be formed with the three holes facing three different directions.

  According to the method for dividing a concrete structure of the present invention, the concrete structure is divided into a plurality of blocks by expanding three holes formed in the plurality of grooves and causing cracks along each groove. be able to.

  Furthermore, in the present invention, the grooves may be formed by a water jet device, the holes may be formed by a low-noise concrete core drill, and cracks along the grooves may be generated by an expanding means.

  According to the method for dividing a concrete structure of the present invention, a water jet device is used to form each groove, and a low-noise concrete core drill is used to form each hole, and cracks are generated along each groove. Since the expansion means is used for this, the work of dividing the concrete structure into a plurality of blocks can be performed with low noise and low vibration.

As described above, according to the method for dividing a concrete structure of the present invention, a plurality of grooves are formed on the surface of the concrete structure along the outline of each block, and at least one location of each groove is formed. The concrete structure can be divided into a plurality of blocks by forming holes and enlarging the holes to cause cracks along the grooves. Therefore, the work of dividing the concrete structure into a plurality of blocks can be performed efficiently.
In addition, each groove is formed with a water jet device, each hole is formed with a low-noise concrete core drill, and each hole is expanded with an expansion means to cause a crack along each groove, so that a concrete structure Can be performed with low noise and low vibration.

It is the schematic which showed one Embodiment of the division method of the concrete structure by this invention, Comprising: It is the schematic of a groove | channel formation process. It is the schematic of a hole formation process. It is the schematic of a division | segmentation process, Comprising: It is the schematic which showed the state which inserted the front-end | tip expansion type jack in each hole formed corresponding to the upper block. FIG. 4 is a partial enlarged view of FIG. 3, and is a schematic view showing a state where a tip expansion jack is operated. It is the schematic which showed the state which cut | disconnected the upper block from the concrete structure. It is the schematic of a division | segmentation process, Comprising: It is the schematic which showed the state which inserted the front-end | tip expansion type jack in each hole formed corresponding to the block of the middle stage. It is the schematic which showed the state which cut | disconnected the block of the middle step from the concrete structure. It is the schematic of a division | segmentation process, Comprising: It is the schematic which showed the state which inserted the front-end | tip expansion type jack in each hole formed corresponding to the lower block. It is the schematic which showed the state which cut | disconnected the lower block from the concrete structure. It is the schematic which showed the state which cut | disconnected the some block from the concrete structure. It is the schematic which showed the state which has cut | disconnected piping. It is the schematic which showed the cut | disconnected piping. It is a systematic diagram of an expansion means. It is a schematic diagram of a tip expansion type jack. It is explanatory drawing which showed the relationship between the constraining surface of a block, and the arrangement position of a tip expansion type jack.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 13 show an embodiment of a concrete structure dividing method according to the present invention. The method for dividing a concrete structure according to the present embodiment is applicable to concrete structures such as concrete blocks fixing pipes such as water pipes, concrete foundations supporting various machines, and foundation beams.

As shown in FIG. 1, the concrete structure dividing method according to the present embodiment is a block 2 having a size capable of transporting the concrete structure 1 by an operator (for example, one side is about 200 mm and the weight is about 20 kg). The cubic block is effective to divide the block, and includes a groove forming step, a hole forming step, and a dividing step.
Hereinafter, each step will be described in detail.

(1) Groove Forming Step In the groove forming step, as shown in FIG. 1, a plurality of grooves 4 are formed on the surface of the concrete structure 1 by the groove forming means 6 along the respective outlines of the plurality of blocks 2. As the groove forming means 6, various low noise and low vibration devices such as a water jet device and a high-speed rotary cutter device are used. In the present embodiment, the water jet device 6 is used as the groove forming means 6. In addition, 3 is piping, such as a water pipe currently embed | buried under the concrete structure 1, in the figure.

  As shown in FIG. 1, the water jet device 6 is generated by, for example, a pump unit 7 having a pump that generates high-pressure water, a motor unit 8 having a motor that rotates the pump 7 of the pump unit, and a pump 7 of the pump unit. A nozzle unit 9 having a nozzle 10 for injecting high-pressure water, an abrasive supply unit 11 for supplying an abrasive to the nozzle 10 of the nozzle unit 9, a recovery unit 12 for recovering the high-pressure water and the abrasive, and the like. .

  In order to form the plurality of grooves 4 on the surface of the concrete structure 1 by the water jet device 6 configured as described above, the pump unit 7, the motor unit 8, the abrasive supply unit 11, and the recovery unit 12 are operated. The high pressure water is supplied from the pump unit 7 to the nozzle 10, the abrasive is supplied from the abrasive supply unit 11 to the nozzle 10, and the high pressure water and the abrasive are supplied from the injection port of the nozzle 10 toward the surface of the concrete structure 1. Let spray.

  Then, on the surface of the concrete structure 1, the nozzle 10 is moved in the vertical direction and the horizontal direction along the outline of each block 2, so that the surface of the concrete structure 1 has a predetermined width and depth. A plurality of grooves 4 are formed in a lattice shape at a predetermined pitch (for example, about 200 mm), and each groove 4 is made to correspond to the outline of each block 2.

In this case, the depth of the groove 4 is adjusted to an appropriate value according to the strength of the target concrete structure 1, the reinforcing bar arrangement situation, and the like.
Further, by using various guide means 13 (for example, an xy axis guide, a robot hand, etc.) and guiding the nozzle 10 by the guide means 13, the nozzle 10 is moved in the vertical direction and the horizontal direction, thereby forming each groove. The processing accuracy of 4 may be kept constant.

  Note that the high-pressure water, the abrasive, and the like used to form the groove 4 are collected by the collection unit 12 and disposed.

(2) Hole forming step As shown in FIG. 2, the hole forming step is a plurality of grooves formed on the surface of the concrete structure 1 along the outlines of the plurality of blocks 2 in the groove forming step. In this embodiment, a low noise type concrete core drill 15 is used as the hole forming means 15.

  In the present embodiment, the vertical direction or horizontal direction along each side of each block 2 at each intersecting portion 5 (a portion corresponding to the corner of each block 2) of the plurality of grooves 4 formed in a lattice shape. And a hole 14 (depth corresponding to one side of each block 2, approximately 200 mm) of a predetermined size (a size capable of inserting an expansion / contraction portion 19 of the expansion means 16 described later), respectively. Forming.

  In addition, each hole 14 may be formed not only in the intersection part 5, but in arbitrary places, such as the center part of each groove | channel 4, and may be formed in both the intersection part 5 and arbitrary places of each groove | channel 4. Also good.

(3) Division Step As shown in FIG. 3, the division step inserts expansion means 16 into each hole 14 formed in the hole formation step, expands each hole 14 by the expansion means 16, and extends along each groove 4. This is a step in which each block 2 is divided and separated from the concrete structure 1 by generating cracks.

  For example, as shown in FIG. 13, the expansion means 16 includes a tip expandable jack 16, a hydraulic supply device 21 that supplies hydraulic pressure to the tip expandable jack 16, and a hydraulic distributor that distributes hydraulic pressure from the hydraulic supply device 21. 20, and a control unit 22 that controls the hydraulic pressure supply device 21 and the hydraulic distributor 20.

  As shown in FIG. 14, the tip-expandable jack 16 includes a cylinder 17, a rod 18 that can be moved forward and backward in the cylinder 17, and an expansion / contraction portion that can expand and contract in a direction perpendicular to the axis of the rod 18 following the forward / backward movement of the rod 18. The hydraulic distributor 20 is connected to the cylinder 17 via a pipe, and the hydraulic supply device 21 is connected to the hydraulic distributor 20 via a pipe.

  In order to divide and disassemble the concrete structure 1 into a plurality of blocks 2, for example, first, the upper block 2a in the first row on the right-hand side in FIG. The block 2b is divided and separated, and the lower block 2b below is divided and separated.

  Next, similarly, each of the blocks 2a to 2c in the second row in the middle front of FIG. 1 is sequentially divided and separated, and then each of the blocks 2a to 2c in the third row in the left front of FIG. Separate and divide sequentially.

  Next, similarly, each block in the first row in the right back of FIG. 1 is sequentially divided and separated, and similarly, each block in the second row in the center of FIG. 1 is sequentially divided and separated, similarly, The blocks in the third row at the left back in FIG. 1 are sequentially divided and separated.

  Specifically, as shown in FIG. 3, first, in the three holes 14 a to 14 c formed so as to correspond to the corners of the uppermost block 2 a in the first row on the right front side in the drawing, the vertical direction and The expansion / contraction portions 19 of the tip expansion type jack 16 are respectively inserted from three directions of two horizontal directions.

  Then, as shown in FIG. 13, the hydraulic pressure is supplied simultaneously from the hydraulic supply device 21 to the three tip expandable jacks 16 via the hydraulic distributor 20, and the expansion / contraction portions 19 of the three tip expandable jacks 16 are expanded at the same time. 4, by enlarging the holes 14 a to 14 c, a reaction force is applied to the concrete structure 1 side as shown in FIG. 4. As shown in FIG. 5, an upper stage is formed by applying a load in the direction B, B, and C, causing a crack along each groove 4 by this load, and growing the crack along each groove 4. The block 2a is separated from the concrete structure 1 and separated.

  In this case, the hydraulic supply device 21 and the hydraulic distributor are fed by the control unit 22 so that the load of the expansion / contraction part 19 of each of the tip expansion jacks 16 is fed back and the load of the expansion / contraction part 19 of each of the tip expansion jacks 16 is equalized. 20 is controlled (tuned control). In addition, when there exists a weak surface in a part of concrete structure 1, it respond | corresponds by bias control etc.

  In addition, when applying a load to each groove | channel 4 with the expansion / contraction part 19 of each front-end | tip expansion-type jack 16, each groove | channel 4 may be pressurized with a fixed force with the expansion / contraction part 19 of each front-end expansion-type jack 16, Each groove 4 may be subjected to fuzzy pressure (for example, pressure applied with strength such as weakening first and gradually strengthening) at the expansion / contraction part 19 of the tip expansion jack 16 or a plurality of tip expansion jacks. 16 may be sequentially operated to sequentially pressurize the grooves 4 sequentially (rocking pressurization).

  Next, as shown in FIG. 6, the expansion / contraction portions 19 of the end-expandable jack 16 are respectively inserted into the two holes 14 d and 14 e formed so as to correspond to the corner portions of the middle block 2 b from two horizontal directions. By inserting and simultaneously supplying hydraulic pressure to the two end-expandable jacks 16 and expanding and contracting portions 19 of the two end-expandable jacks 16 at the same time to expand the holes 14d and 14e, the concrete structure 1 side The load in the direction D and E in the figure is applied to each groove 4 by the expansion / contraction part 19 of each end expansion type jack 16, and this load causes a crack along each groove 4. By growing a crack along each groove 4, the middle block 2 b is divided and separated from the concrete structure 1 as shown in FIG. 7.

  Next, as shown in FIG. 8, in the two holes 14f and 14g formed so as to correspond to the corners of the lower block 2c, the expansion / contraction portions 19 of the tip expansion jack 16 are respectively provided from two horizontal directions. By inserting and simultaneously supplying hydraulic pressure to the two end-expandable jacks 16 and expanding the expansion / contraction portions 19 of the two end-expandable jacks 16 at the same time to expand the holes 14f and 14g, the concrete structure 1 side The load in the F direction and the G direction in the figure is applied to each groove 4 by the expansion / contraction part 19 of each tip expansion type jack 16, and a crack is generated along each groove 4 by this load. By growing a crack along each ridge 4, the lower block 2 c is divided and separated from the concrete structure 1 as shown in FIG. 9.

  Similarly, each block 2a to 2c in the second row in the front center of FIG. 1, each block 2a to 2c in the third row on the left side in front, each block in the first row on the back right side, each block in the second row in the back center The extended portions 19 of the extended tip jacks 16 are respectively inserted into the holes 14 (see FIG. 3) formed so as to correspond to the corners of the blocks and the blocks in the third row on the far left side. Each of the blocks 2a to 2c in each row is divided and separated from the concrete structure 1 by expanding the 16 extending portions 19 to enlarge each hole 14 and causing a crack along each groove 4.

  Thus, as shown in FIG. 10, the concrete structure 1 can be disassembled by dividing the concrete structure 1 into a plurality of blocks 2 and separating them.

  The pipe 3 such as a water pipe embedded in the concrete structure 1 is divided into a plurality of blocks 2 to separate the concrete structure 1 or separated into a plurality of blocks 2 for separation work. Accordingly, for example, as shown in FIGS. 11 and 12, the pipe 3 is cut to a predetermined length (length and weight that can be carried by the worker) by using the water jet device 6, so that the operator can Can be carried out by work.

  In this case, a guide means 13 such as a guide rail may be provided so as to surround the circumference of the pipe 3, and the nozzle 10 of the water jet device 6 may be moved along the guide means 13.

  In the concrete structure dividing method of the present embodiment configured as described above, a plurality of grooves 4 are formed so as to correspond to the outline of each block 2 of the target concrete structure 1 by the water jet device 6. And a hole 14 is formed in at least one location of each groove 4 (intersection portion 5 in the present embodiment) with a low-noise concrete core drill 15, and the expansion / contraction portion 19 of the tip expansion jack 16 is formed in each hole 14. Each block 2 can be divided and separated from the concrete structure 1 by inserting and expanding the expanding / contracting portion 19 to expand each hole 14 and causing each groove 4 to crack.

  Therefore, unlike the dividing method using a wire saw, the number of steps does not increase, and the work of dividing the concrete structure 1 into a plurality of blocks 2 and disassembling can be performed efficiently.

  In addition, a water jet device is used as the groove forming means, a low-noise concrete core drill is used as the hole forming means, and a tip-type expansion jack is used as the expanding means, so that the concrete structure 1 can be formed with low noise and low vibration. It can be divided into a plurality of blocks 2 and disassembled, and even in an area where noise and vibration are restricted, there is no restriction on the time zone in which work can be performed.

  In the above description, the holes 14 are formed in the intersecting portions 5 of the grooves 4 and the grooves 4 are cracked through the holes 14. You may comprise so that a hole may be formed in arbitrary 1 place or several places, and a crack may be produced in each groove | channel 4 using this hole.

  Further, in the above description, an equal load is applied to the upper block 2a having the free surface of 3 from the three directions of the two directions perpendicular to each other in the vertical direction and the horizontal direction. 2b and the lower block 2c were equally loaded from two directions orthogonal to each other in the horizontal direction, but the block having one free surface is not shown but is perpendicular to the surface. By inserting the expansion / contraction portions 19 of the plurality of extended end jacks 16 so as to increase the free surface, the target block can be separated from the concrete structure.

  Further, in the above description, the tip expansion jack is used as the expansion means, but the present invention is not limited to this, and various other pressurizing methods may be used. For example, a method of inserting a gap material such as a thread arrow into the hole to pressurize the hole, a method of pressurizing the hole by filling the hole with a chemical agent such as an expanding material, or adding a hole by explosive expansion such as explosives Various pressurization methods such as a method of pressurizing and a method of pressurizing the holes by expansion of metal vapor accompanying metal sublimation by high voltage can be used. In short, any method that can pressurize the hole with low noise and low vibration may be used.

  Furthermore, in the above description, the concrete structure 1 is divided into a plurality of cubic blocks 2. However, the concrete structure 1 may be divided into various three-dimensional blocks such as a rectangular parallelepiped block and other polyhedral blocks. Good.

  Further, the order of division into a plurality of blocks 2 is not limited to the above order, and after dividing each block 2 in the upper stage, each block 2 in the middle stage is divided, and thereafter, each block 2 in the lower stage is divided. Various other orders may be employed.

  Furthermore, in the above description, the present invention is applied to the case where the entire concrete structure 1 is divided into a plurality of blocks 2. However, when a part of the surface of the concrete structure 1 is divided and separated, the concrete structure The present invention may be applied to a case where the interior of the object 1 is partially divided and separated.

  FIG. 15 shows the relationship between the constraining surface of the block 2 and the arrangement position of the tip expansion jack 16. When the concrete structure 1 is divided into a plurality of blocks 2, one extended-end jack 16 is required for the constraining surface of each block 2. The end expansion type jacks 16 are inserted into the holes 14 on the surface.

  For example, when the number of constraining surfaces of the block 2 is 4, as shown in FIG. 15 (a), a hole 14 is formed in the center of each groove 4 corresponding to each constraining surface, and the inside of each hole 14 Insert the extended tip jack 16 into the. Alternatively, as shown in FIG. 15 (b), holes 14 are formed at the intersections of the grooves 4 corresponding to the respective constraining surfaces, and the end-expandable jacks 16 are inserted into the respective holes 14.

  Further, when the number of constraining surfaces of the block 2 is 3, as shown in FIGS. 15C and 15D, holes 14 are respectively formed in the central portions of the grooves 4 corresponding to the constraining surfaces, A tip expansion type jack 16 is inserted into each hole 14.

  Further, when the number of constraining surfaces of the block 2 is 2, as shown in FIG. 15 (e), a hole 14 is formed in the center of each groove 4 corresponding to each constraining surface, Insert the extended tip jack 16 into the.

  Further, when the number of constraining surfaces of the block 2 is 1, a hole 14 is formed in the center of the groove 4 corresponding to the constraining surface as shown in FIG. Insert the type jack.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2, 2a-2c Block 3 Piping 4 Groove 5 Intersection 6 Groove formation means (water jet apparatus)
7 Pump unit 8 Motor unit 9 Nozzle unit 10 Nozzle 11 Abrasive supply unit 12 Recovery unit 13 Guide means 14, 14a-14g Hole 15 Hole forming means (low noise concrete core drill)
16 Expansion means (extendable jack)
17 Cylinder 18 Rod 19 Expansion / contraction part 20 Hydraulic distributor 21 Hydraulic supply device 22 Control part

Claims (5)

A concrete structure dividing method for dividing a concrete structure into a plurality of blocks,
On the surface of the concrete structure, a groove forming step for forming a plurality of grooves along the outline of each block, a hole forming step for forming holes in at least one location of each groove, A splitting method for a concrete structure, comprising: a splitting step for causing cracks along the grooves by enlarging the holes.   The method for dividing a concrete structure according to claim 1, wherein the hole is formed in each of the intersecting portions of the plurality of grooves.   The method for dividing a concrete structure according to claim 1, wherein the hole is formed in a central portion of each of the plurality of grooves.   The method for dividing a concrete structure according to claim 1, wherein the plurality of grooves are formed with three holes facing different three directions.   5. The method according to claim 1, wherein the grooves are formed by a water jet device, the holes are formed by a low-noise concrete core drill, and cracks are generated along the grooves by an expanding means. The method for dividing a concrete structure according to claim 1.