JP2017134034A - Device for taking concrete core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for taking a concrete core, which facilitates breaking-off of an elongated concrete core at a base end and taking-out of the concrete core from a concrete structure, preventing damage or break, and which can be applied to remote operations.SOLUTION: A device 10 for taking a concrete core, according to an embodiment of the present invention, is used to break off a core portion T2 surrounded by an annular groove T1 formed in a concrete structure, and to take the concrete core having been broken off. The device for taking a concrete core includes: a support 11 that can be withdrawn from and inserted into the inside of the annular groove T1, and at least a lower portion of the core portion T2, and which can reach the inner side of the longitudinal center when inserted into the annular groove T1; a jack 13 having an expandable and contractible operating portion 13a that can face the core portion T2 and can be disposed near the longitudinally X inner portion of the annular groove T1; and a drive portion 15 that can advance and retract the support 11 longitudinally X along the annular groove T1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete core collecting apparatus.

Conventionally, in order to evaluate the properties and soundness of a concrete structure, various tests such as collection of a concrete core from the concrete structure and a compressive strength test are performed on the collected concrete core.
When collecting a concrete core from a concrete structure, first, a core drill is set on the surface of the concrete structure and drilled to form an annular groove (hereinafter referred to as an annular groove). As a result, a core part surrounded by the annular groove and connected to the concrete structure outside the annular groove is formed at the bottom of the annular groove (that is, the innermost part in the annular groove when viewed from the surface of the concrete structure). .
Next, using a chisel or the like, the core part is broken from the concrete structure to obtain a substantially cylindrical concrete core. The concrete core is recovered by removing the concrete core from the concrete structure to the outside.

  As a device for folding a core part and collecting a concrete core, that is, a device for collecting a concrete core, for example, Patent Document 1 discloses that a concrete core is folded from a concrete structure using a core bit that forms an annular groove. A sampling device that can do this has been proposed.

JP2013-256051A

  For example, when evaluating the properties and soundness of concrete structures around nuclear power plants, concrete structures near radiation emitting facilities, etc. In order to prevent exposure of workers, it is necessary to collect concrete cores remotely using a robot or the like. Further, in order to examine the exposure amount of concrete, it is required to collect a concrete core having a longer length (for example, a length dimension of 2 m or more) than usual (for example, a length dimension of 1 m or less).

However, it is easy to collect a short concrete core using a conventional concrete core collection device (hereinafter, sometimes simply referred to as “collection device”), but it is not possible to collect a long concrete core. Not easy.
That is, when the concrete core is long, when the core portion is hit using a sampling device manufactured assuming that the short concrete core is sampled, the impact due to the hit is at the point of transmission target. It is added to a position other than the base end side of a certain core part (that is, the innermost part of the core part when viewed from the surface of the concrete structure), and the concrete core is easily damaged or broken. Therefore, even if the annular groove is formed deeply and the length dimension of the core part is increased, the core part sometimes breaks and breaks at an intermediate position. In addition, even if the concrete core can be folded from the concrete structure at the bottom side of the deeply formed annular groove, when the concrete core is removed from the concrete structure, its own weight and impact are locally applied. The concrete core could break or break.
In particular, when a concrete core is collected remotely from a concrete structure in an environment that may be contaminated with radioactive materials or in an environment where workers cannot enter, a long concrete core breaks in the middle. The recovery of the concrete core becomes difficult.
Until now, there has been an example in which a relatively short concrete core having a length of about 100 mm has been collected remotely, but no example in which a long concrete core has been collected has been found.

  The present invention has been made in view of the above circumstances, and it is easy to fold a long concrete core on the base end side and prevent breakage or breakage from the concrete structure, and also for remote work. An applicable concrete core sampling device is provided.

  The concrete core collecting device according to claim 1 is a concrete core collecting device that breaks a core portion surrounded by an annular groove formed in a concrete structure and collects the broken concrete core outside the concrete structure. The sampling device is configured to be insertable / removable inside the annular groove and at least below the core portion, and configured to be able to reach the back side from the longitudinal center of the annular groove when inserted into the annular groove. And an operating part that is configured to be disposed in the vicinity of the inner part of the annular groove in the longitudinal direction and that can be expanded and contracted when the support is inserted into the annular groove. And a drive unit configured to be able to advance and retract the support along the longitudinal direction of the annular groove.

  According to the above-described concrete core sampling device, by inserting the support into the annular groove and operating the operation portion of the jack, the long core portion is folded at the proximal end side, and the broken concrete core is It can be stably placed on the support. Thereafter, by removing the support from the concrete structure, the long concrete core can be easily taken out from the concrete structure and recovered without damaging the long concrete core.

  The concrete core collecting device according to claim 2 preferably includes a guide body configured to be insertable / removable inside the annular groove and above the core portion.

  According to the above-described concrete core collecting device, even if the concrete core pressed and broken by the operating portion of the jack rapidly rises as the jack expands, the guide body is inserted into the annular groove from below. The rising speed of the concrete C can be moderately suppressed by the spring effect when the horizontal interval between the front ends of the guide body is expanded by the rising of the concrete core C. Moreover, it can prevent that the concrete core C contact | abuts directly on the outer peripheral surface upper part of an annular groove, and can reduce the load to a concrete core. This can prevent the long concrete core from being damaged or broken.

  According to the concrete core collecting apparatus of the present invention, it is easy to fold a long concrete core at the base end side and prevent breakage or breakage and take it out from the concrete structure, which is also applicable to remote work. be able to.

1 is a perspective view of a concrete core collecting device according to an embodiment of the present invention. It is a top view of the sampling device of the concrete core concerning one embodiment of the present invention. It is a figure for demonstrating the sampling process of the concrete core using the sampling device of the concrete core which concerns on one Embodiment of this invention, and is a side view which shows the state which installed the sampling device of the concrete core in the exterior of a concrete structure is there. It is a figure for demonstrating the sampling process of the concrete core using the sampling device of the concrete core which concerns on one Embodiment of this invention, and shows the state which inserted the support body and guide body of the sampling device of the concrete core in the annular groove It is a side view. It is a figure for demonstrating the sampling process of the concrete core using the concrete core sampling device concerning one embodiment of the present invention, and operating the operation part of the jack of the concrete core sampling device, and folding the core part FIG. It is a figure for demonstrating the sampling process of the concrete core using the sampling device of the concrete core which concerns on one Embodiment of this invention, and is a side view which shows a mode that taking out the broken concrete core to the exterior of a concrete structure. .

  Hereinafter, with reference to the drawings, a concrete core collecting device (hereinafter, simply referred to as “collecting device”) according to an embodiment of the present invention will be described.

  As shown in FIG. 1, the sampling device 10 of the present embodiment collects a core T2 surrounded by an annular groove T1 formed in a concrete structure T from the concrete structure T, and collects a concrete core C. This is an apparatus configured so that the concrete core C can be taken out of the concrete structure T.

  The annular groove T1 is formed from the surface of the concrete structure T around the central axis L. The cross section of the annular groove T1 orthogonal to the central axis L is annular. The annular groove T1 is formed, for example, by cutting the concrete structure T from the surface toward the inside using a core bit (see, for example, FIG. 3). The method for forming the annular groove T1 is not limited to the method using the core bit.

  The core portion T2 is the entire portion surrounded by the annular groove T1, and has a cylindrical shape. The core portion T2 is connected to the concrete structure T outside the annular groove T1 at a base end portion T2a corresponding to the inner portion (back) T1a of the annular groove T1.

  As shown in FIGS. 1 and 2, the sampling device 10 is configured to be insertable / removable inside the annular groove T1 and at least below the core T2, and when inserted into the annular groove T1, the longitudinal direction X of the annular groove T1. The support 11 is configured to be able to reach the back side from the center of the core, and faces the core portion T2 when the support 11 is inserted into the annular groove T1, and in the vicinity of the back portion T1a in the longitudinal direction X of the annular groove T1. A jack 13 having an actuating portion 13a that can be arranged and expandable / shrinkable, and a drive portion 15 that is configured to be able to advance and retract the support 11 along the longitudinal direction X of the annular hole T1 are provided. . In addition, the collection device 10 of the present embodiment includes a guide body 17 configured to be insertable / removable inside the annular groove T1 and above the core portion T2.

  The support 11 has an arc shape in which a cross-sectional shape orthogonal to the central axis L of the annular groove T1 corresponds to a shape below the center in the vertical direction of the annular groove T1, and the cross section of the arc shape extends along the central axis L. It is a bowl-shaped member formed so as to be continuous. As shown in FIG. 2, the tip 11c of the support 11 is formed in a curved shape in plan view.

  The support body 11 is comprised from the base end part 11a, the support part 11b, and the front-end | tip part 11c along the longitudinal direction. The base end portion 11a is located outside the concrete structure T when the support body 11 is inserted into the annular groove T1. The base end portion 11 a is formed with a connecting hole 16 that is used when connecting to the drive unit 15.

  Regarding the length of the support 11, the sum of the length of the support 11b and the length of the tip 11c is at least half of the length in the longitudinal direction X of the annular groove T1, and the annular groove T1. Is preferably 3/4 or more of the length dimension in the longitudinal direction X, and more preferably substantially the same as the length dimension in the longitudinal direction X of the annular groove T1. With such a configuration, when inserted into the annular groove T1, the distal end portion 11c can reach the inner portion T1a from the center in the longitudinal direction X of the annular groove T1, and the support 11 is formed of a long concrete core C (FIG. 6). It has a length that can be stably placed. In the present embodiment, the base end portion 11a is disposed outside the annular groove T1, and the distal end portion 11c is in contact with the inner portion T1a of the annular groove T1 with the support portion 11b and the distal end portion 11c being inserted into the annular groove T1. The length dimension of the support body 11 is set so that it becomes possible.

  The thickness dimension of the support 11 is set to be equal to or less than the width dimension of the annular groove T1, and is appropriately set within the range of the thickness dimension capable of securing the strength capable of supporting the concrete core C.

  The material of the support 11 is not particularly limited as long as it can stably place the long concrete core C, and examples thereof include steel and the like from the viewpoint of being suitable for processing such as welding.

  The jack 13 is a member for obtaining the concrete core C by pressing the core portion T2 from below and breaking it. A plate jack which is a fluid pressure jack is used for the jack 13 of the present embodiment. The jack 13 of the present embodiment is provided with an operating portion 13a that is attached to the distal end portion 11c of the support 11 and can be expanded and contracted by fluid pressure such as water pressure. A flow path 13b for supplying fluid pressure from the drive unit 15 to the operation unit 13a is connected to the operation unit 13a. The operating part 13 a and the flow path 13 b are provided on the inner peripheral surface of the support 11 along the longitudinal direction of the support 11.

The operating portion 13a is formed by a pair of thin plate portions facing each other being joined in a liquid-tight manner at the periphery. The actuating part 13a has a flat shape, and the sum of the thickness dimension of the support body 11 to which the actuating part 13a is mounted (the tip part 11c in this embodiment) and the thickness dimension when the actuating part 13a is contracted is the sum. The width of the annular groove T1 is smaller (see FIG. 4).
When the fluid pressure is supplied from the driving unit 15, the operating unit 13a expands due to an increase in the thickness between the outer surfaces of the pair of thin plate portions, and when the fluid pressure is released, the operating unit 13a expands between the outer surfaces of the pair of thin plate portions. The thickness decreases and shrinks.

With the above-described configuration, when the support body 11 is inserted into the annular groove T1, the operating portion 13a can be opposed to the core portion T2, and can be disposed at a position near the bottom T1a of the annular groove T1.
In addition, when the sum of the length dimension of the support part 11b of the support body 11 and the length dimension of the front-end | tip part 11c is half or more and 3/4 or less of the length dimension in the axial direction X of the annular groove T1, for example, A configuration in which the lower thin plate portion of the operating portion 13a is extended from the distal end portion 11c of the support 11, or the lower portion of the operating portion 13a and the distal end portion 11c of the support 11 are connected using an appropriate thin plate member. Thus, at the time of inserting the support body 11 into the annular groove T1, at least the expansion / contraction part of the operating part 13a can be arranged at a position near the bottom T1a of the annular groove T1.

  The drive unit 15 is for inserting and removing the support body 11 and a guide body 17 to be described later by remote control along the central axis L of the annular groove T1, and appropriately supplying a fluid such as water to the flow path b of the jack 13. For example, a remote control robot or the like. The configuration of the drive unit 15 is not particularly limited as long as the support body 11 and the guide body 17 as described above can be inserted and removed and a fluid such as water can be supplied to the flow path 13b of the jack 13.

The guide body 17 includes a pair of long members disposed so as to extend in parallel with each other, and a connecting portion that connects one end of each of the pair of long members. It is formed by bending a long member. Hereinafter, in the guide body 17, the side where the pair of long members are connected by the connecting portion is the base end side, and the side where the ends of the pair of long members are spaced apart from each other is the front end side. .
In FIG. 2, the guide body 17 is omitted.

  As shown in FIG. 1, the guide body 17 has a base end portion 17 a made of a long member on the connecting portion and the base end side, and a length other than the base end side and the tip end side along the longitudinal direction X of the annular groove T <b> 1. It comprises a guide portion 17b made of a scale member and a tip portion 17c made of a long member on the tip side. The base end portion 17a is located outside the concrete structure T when the guide body 17 is inserted into the annular groove T1. The connecting portion provided at the base end portion 17 a is provided with a connecting portion (not shown) used when connecting to the driving portion 15.

As for the length dimension of the guide body 17, the sum of the length dimension of the guide portion 17b and the length dimension of the tip end portion 17c is substantially equal to the length dimension in the longitudinal direction X of the annular groove T1. With such a configuration, the guide body 17 can reach the distal end portion 17c near the back portion T1a from the center in the longitudinal direction X of the annular groove T1 when inserted into the annular groove T1. Thereby, the front-end | tip part 17c of the guide body 17 is distribute | arranged between the upper part of the base end part T2a of the core part T2, and the concrete structure T. FIG. In the guide body 17, for example, when the sudden expansion of the operating portion 13 a of the jack 13 occurs, the interval between the tip portions 17 c is expanded by the rise of the concrete core C from below, and the interval between the tip portions 17 c is expanded. The rising speed of the concrete C is moderately suppressed by the spring effect. Thereby, it has the length which can prevent generation | occurrence | production of the breakage and fracture | rupture of the concrete core C.
The thickness dimension of the guide body 17 is appropriately set within a range equal to or less than the width dimension of the annular groove T1.

  Moreover, the material of the guide body 17 is the reaction which the front-end | tip part 17c tries to return to the original position by the reaction which the space | interval of the front-end | tip parts 17c expanded when the core part T2 was cut out or the concrete core C raised as mentioned above. The material is not particularly limited as long as it is a material capable of generating a force, that is, exhibiting a spring effect. From the viewpoint of exhibiting the spring effect as described above, examples of a suitable material for the guide body 17 include a spring material and spring steel, and examples thereof include SW-C (hard steel wire). By using a so-called round bar having a circular cross section, such as a SW-C round wire rod, as the guide body 17, the contact between the guide body 17, the concrete structure T, and the core portion T2 is not a surface contact but a line. The contact and the contact area are reduced, so that the guide body 17 can be inserted and removed more smoothly.

  Next, the process of collecting the concrete core C from the concrete structure T by remote operation using the collection apparatus 10 will be described with reference to FIGS. 3 to 6, the drive unit 15 is omitted.

First, a moving body (not shown) is moved to a desired position and height with respect to the concrete structure T, and the concrete structure T is cut with a core bit (not shown) to form an annular groove T1. Thereby, as shown in FIG. 3, the core part T2 surrounded by the annular groove T1 and connected to the concrete structure T outside the annular groove T1 at the base end part T2a is formed.
Thereafter, the core bit is taken out from the annular groove T1, and the support body 11, the jack 13 and the guide body 17 are arranged at positions corresponding to the annular groove T1 outside the concrete structure T by the driving unit 15.

  Next, as shown in FIG. 4, the support portion 11 is inserted into the annular groove T <b> 1 and below the core portion T <b> 2 in the insertion direction D <b> 1 by the driving unit 15, and the guide body 17 is inserted into the annular groove T <b> 1. And inserted above the core T2. The support body 11 is disposed at a position where the distal end portion 11c reaches the inner portion T1a of the annular groove T1, and the guide body 17 is disposed at a position where the distal end portion 17c reaches the inner portion T1a of the annular groove T1.

Next, as shown in FIG. 5, the operating unit 13 a is expanded by supplying a fluid such as water to the flow path 13 b of the jack 13 by the driving unit 15, and the proximal end T <b> 2 a of the core T <b> 2 is operated by the operating unit 13 a. By pressing the side upward, the core portion T2 is folded at the base end portion T2a. Thereby, a long concrete core C as shown in FIG. 6 is formed.
When the core portion T2 is folded at the base end portion T2a, a part of the core portion T2 may be rapidly increased immediately after expansion due to the pressure of the operating portion 13a. In the present embodiment, the concrete core C broken from the core portion T2 rises with the expansion of the operation portion 13a, and the interval between the distal end portions 17c of the guide body 17 disposed above the core portion T2 operates. At the same time as the portion 13a expands in synchronization with the expansion speed of the portion 13a and the rising speed of the concrete core C, the front end portion 17c attempts to return to the original position, and thus a reaction force is generated. Accordingly, a reaction force is applied to the expansion of the operating portion 13a and the rise of the concrete core C due to the spring effect when the distance between the tip portions 17c increases, so that the rapid rise of the concrete core C is suppressed.

As shown in FIG. 6, the broken concrete core C is lowered by its own weight and placed on the support portion 11 b of the support 11.
After the concrete core C is placed on the support part 11b of the support body 11, the support part 11 and the guide body 17 are pierced from the hole formed by the outer peripheral wall of the annular groove T1 of the concrete structure T by the drive part 15. It is extracted in the extraction direction D2 along the central axis. Thereby, the long concrete core C can be pulled out from the concrete structure T in a state where the lower and upper sides are protected by the support 11 and the guide body 17.
Thereafter, the long concrete core C broken from the concrete structure T is recovered by moving the movable body to a predetermined position while the concrete core C is supported by the drive unit 15. The process of collecting the concrete core C from the structure T is completed.

According to the sampling device 10 of the present embodiment described above, the support 11 is configured to be insertable / removable at least inside the annular groove T1 and at least below the core portion T2, so that the support 11 is broken from the concrete structure T. Even if the concrete core C descends due to its own weight, it can be stably received below and placed on the inner peripheral surface of the support 11. In addition, since the support 11 is configured to be able to reach the back portion T1a from the center in the longitudinal direction X of the annular groove T1 when inserted into the annular groove T1, the long concrete core C can be stably supported by the support 11 It is possible to prevent breakage of the concrete core C due to dropping off from the support 11 even during movement of the support 11.
Further, the operation portion 13a of the jack 13 is configured so as to face the core portion T2 when the support body 11 is inserted into the annular groove T1, and to be disposed in the vicinity of the inner portion T1a in the longitudinal direction X of the annular groove T1, and Since it can be expanded and contracted, the actuating portion 13a of the jack 13 can be disposed on the inner side of the annular groove T1 by inserting the support 11 into the annular groove T1 by the driving portion 15. And the base end part T2a of the core part T2 can be more accurately pressed only by operating and expanding the operating part 13a. Thereby, the long concrete core C which has the desired length dimension substantially equivalent to the dimension along each longitudinal direction of the annular groove T1 and the core part T2 can be broken off. Further, the drive unit 15 is configured so that the support 11 can be advanced and retracted along the longitudinal direction X of the annular groove T1, and the fluid pressure can be applied to and sucked from the flow path 13b of the jack 13. The core C collecting step can be performed almost automatically and remotely.

That is, according to the sampling device 10 of the present embodiment, the long core portion T2 is moved to the proximal end by operating the operating portion 13a of the jack 13 by inserting the support 11 into the annular groove T1 by the driving portion 15. The part T2a can be more reliably folded, and the broken concrete core C can be stably placed on the support 11. Thereafter, by removing the support 11 from the concrete structure T by the drive unit 15, it is possible to prevent the concrete core C from being subjected to a partial load or impact, and the long concrete core C is damaged. It can be easily taken out from the concrete structure T without being collected.
Therefore, for example, when investigating the strength of a concrete structure T contaminated with a radioactive substance, a long concrete core C can be collected by remote operation in an unattended area by a robot operation.

Further, the sampling device 10 of the present embodiment includes a guide body 17 that suppresses the rise of the broken concrete core C while being inserted into the annular groove T1 and disposed above the core portion T2. .
According to this structure, when the concrete body C pressed and broken by the operating portion 13a of the jack 13 is raised by inserting the guide body 17 above the core portion T2 in the annular groove T1, the horizontal direction is increased. At the same time, the distal end portions 17c are pushed away from each other in the direction away from each other, and the interval between the distal end portions 17c (interval between the distal end portions 17c in the horizontal direction) expands in synchronization with the rising speed of the concrete core C. Since 17c tries to return to the original position, a reaction force is generated. Thereby, a reaction force is applied to the rise of the concrete core C due to the spring effect when the interval between the tip portions 17c is expanded, and the rise speed of the concrete core C is suppressed, so that the rapid rise of the concrete core C is suppressed. Moreover, it can prevent that the concrete core C contact | abuts directly to the wall surface which comprised the outer peripheral surface of the annular groove T1. Therefore, the long concrete core C can be prevented from being damaged or broken. Moreover, it respond | corresponds also to the rapid action | operation etc. of the action | operation part 13a of the jack 13, and can prevent the breakage | damage and fracture | rupture of the long concrete core C.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, in the above-described embodiment, the example in which the sampling device 10 includes the guide body 17 has been described. However, when the width dimension of the annular groove T1 is relatively large, or the control related to the expansion / contraction of the operating portion 13a of the jack 13 is performed. In a case where the above-described is highly possible, the sampling device 10 can be configured without using the guide body 17.

10 Sampling device (Concrete core sampling device)
DESCRIPTION OF SYMBOLS 11 Support body 13 Jack 13a Actuation part 15 Drive part 17 Guide body C Concrete core T1 Annular groove T1a Back part T2 Core part T Concrete structure X Longitudinal direction

Claims (2)

A concrete core collecting device for folding a core portion surrounded by an annular groove formed in a concrete structure, and collecting the broken concrete core outside the concrete structure,
A support body configured to be insertable / removable inside the annular groove and at least below the core portion, and configured to be able to reach the back side from the longitudinal center of the annular groove when inserted into the annular groove;
A jack having an operation part that is opposed to the core part at the time of insertion of the support body into the annular groove and that is disposed in the vicinity of the back part in the longitudinal direction of the annular groove and that can expand and contract;
A drive unit configured to be able to advance and retreat the support along the longitudinal direction of the annular groove;
A concrete core collecting device comprising:   The concrete core sampling device according to claim 1, further comprising a guide body configured to be insertable / removable inside the annular groove and above the core portion.

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