JP2008174915A - Concrete drilling implement, and drilling method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reusable concrete drilling implement by which a hole can be formed at a foundation structure, and a drilling method using the implement. <P>SOLUTION: This concrete drilling implement for forming the hole in the foundation structure of a building comprises an elastically-deformable pipe body 10 with an axially-formed cut 11, and an interval lengthening member 20 which is inserted into the cut 11 withstanding an elastic force of the pipe body 10 and provided in such a manner as to be axially slidable in the cut 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a concrete drilling jig for providing a hole such as an anchor planting hole or the like in a foundation structure serving as a foundation of a building, and a drilling method using the jig.

Conventionally, for example, in order to provide an anchor planting hole in a foundation structure made of concrete, a method of embedding a sheath tube in concrete and using the inside of the sheath tube as an anchor planting hole has been adopted. More specifically, a fabric foundation mold is assembled on an upper portion of a foundation base previously formed by placing concrete, and a sheath tube is fixed in the mold. Then, concrete is placed inside the mold while avoiding the inside of the sheath tube. A foundation structure provided with anchor planting holes is formed by removing the mold after the concrete has hardened (see Patent Document 1).
Japanese Utility Model Publication No. 5-27137

  However, in the conventional drilling method using the sheath tube, the compressive force at the time of hardening the concrete acts on the sheath tube and the sheath tube is fixed in the foundation structure, and the sheath tube is taken out from the foundation structure. Has become difficult. In many cases, the sheath tube has to be left in a state of being embedded in the foundation structure, and has been treated as a consumable item without being reused. For this reason, one sheath tube is required to provide one hole, which increases the construction cost. In addition, since the length of the conventional sheath tube must be adjusted according to the depth of the hole provided in the foundation structure, it is necessary to cut the surplus portion each time, and the work process becomes complicated. At the same time, there was a problem that the cut part became waste waste.

  The present invention has been made in view of these conventional situations, and an object of the present invention is to provide a reusable concrete drilling jig and a jig for easily providing a hole in a foundation structure. It is to provide a drilling method used.

  In order to achieve the above object, the concrete drilling jig according to claim 1 is a concrete drilling jig for providing a hole in a building foundation structure, and an incision is formed in an axial direction. An elastically deformable tube body, and a gap widening member that is inserted into the notch against the elastic force of the tube body and is slidable in the axial direction within the notch. It is characterized by that.

  According to the above configuration, when the interval increasing member is inserted into the cut, the tube is in an expanded state in which the cut interval of the tube is expanded, and the cross-sectional area of the tube is expanded. On the other hand, when the gap increasing member is removed from the cut of the tube in the expanded state, the cut interval of the tube is reduced by its own elastic force and returns to the original state. Therefore, after placing the expanded pipe in the formwork of the substructure and placing concrete in the formwork, remove the gap widening member from the cut in the pipe and restore the pipe to its original state. By doing so, the tubular body is peeled from the concrete and released from the compressive force when the concrete is hardened. Therefore, the pipe body can be taken out from the concrete, and the concrete drilling jig can be reused. Moreover, according to the said structure, since it is not necessary to cut | disconnect the jig | tool for concrete drilling, the working efficiency for providing a hole part improves.

  A concrete drilling jig according to a second aspect is the invention according to the first aspect, wherein the gap enlargement imparting member is formed such that the thickness thereof increases from the distal end portion toward the proximal end portion. It is characterized by.

  For example, when the thickness of the gap enlargement imparting member is formed to be constant, the degree of enlargement of the tubular body in the enlarged state is constant at any position in the axial direction. For this reason, when the gap enlargement imparting member is slid and removed from the pipe body in the expanded state, the restoring action of the pipe body occurs only at a portion where the gap enlargement imparting member is not inserted into the notch. However, according to the above configuration, since the degree of enlargement of the tube body in the expanded state increases toward the proximal end portion side of the interval enlargement imparting member, the interval enlargement imparting member is moved from the tube in the expanded state to the proximal end portion direction. When sliding and removing, the degree of expansion of the entire tubular body is simultaneously reduced, and a restoring action is simultaneously produced on the entire tubular body. Therefore, when removing the concrete drilling jig from the concrete, the peeling of the pipe from the concrete proceeds smoothly.

  The jig for drilling concrete according to claim 3 is the invention according to claim 1 or 2, wherein the gap enlargement imparting member is provided with a lid portion that closes an end opening of the tubular body at a tip thereof. The shape of the lid part is formed so as to be equal to the internal shape of the tubular body in a state in which the gap enlargement imparting member is inserted.

  According to the said structure, since one edge part of the pipe body in the expansion state is closed by a cover part, the penetration | invasion of the concrete from the edge part side to the inside of a pipe body is prevented. For this reason, the hole which opened only one end can be stably provided with respect to a foundation structure.

  A concrete drilling jig according to a fourth aspect is the invention according to any one of the first to third aspects, wherein a plurality of the pipe bodies and a plurality of the spacing expansion imparting members are provided, and a base of the spacing expansion imparting member is provided. The gist is that the ends are connected to each other.

  According to the above configuration, it is possible to provide a plurality of holes in the foundation structure using one concrete drilling jig, and it is easy to ensure a constant distance between the plurality of holes. .

  A drilling method using the concrete drilling jig according to claim 5 is a drilling method using the concrete drilling jig according to any one of claims 1 to 4, wherein After inserting the gap enlargement imparting member into the incision to make the tubular body in an expanded state, placing the tubular body in the expanded state in the formwork of the foundation structure and placing concrete in the formwork, The tubular body is peeled off from the concrete by removing the gap increasing member from the cut of the tubular body and restoring the tubular body to its original state.

  According to the above configuration, the concrete drilling jig can be reused, and the work of cutting the sheath tube as in the conventional technique is not required, so that the work efficiency for providing the hole is increased. Will improve.

  According to the concrete drilling jig of the present invention, it is reusable and a hole can be easily provided in the foundation structure. Further, according to the drilling method of the present invention, it is possible to easily provide a hole in the foundation structure and to suppress the construction cost.

  Hereinafter, a concrete drilling jig embodying the present invention will be described with reference to FIGS. FIG. 1 shows a tubular body 10 and an interval widening imparting member 20 of the present invention. The tubular body 10 is a cylindrical member made of vinyl chloride, and both ends thereof are opened. A cutout 11 extending in the axial direction is provided on the peripheral surface of the tube body 10, and a guide cutout 12 having a large cut width is provided on the base end A (left end portion in FIG. 1) side of the tube body 10. It has been. The guide notch 12 is greatly notched toward the base end A, and is provided so as to be inclined with respect to the axial direction of the tube body 10.

  Next, the interval enlargement imparting member 20 will be described. The spacing enlargement imparting member 20 is a member that is inserted into the cut 11 of the tubular body 10 and is a member that enlarges the spacing between the cut surfaces 13 and 14 of the tubular body 10.

  The interval enlargement imparting member 20 is provided with a long plate-like insertion portion 21 disposed in the cut 11 of the tube body 10. The thickness Z of the insertion portion 21 extends from the distal end portion b (the right end portion in FIG. 1) of the interval enlargement imparting member 20 toward the base end portion a (the left end portion in FIG. 1) of the interval enlargement imparting member 20. The tip end b is formed so that its thickness Z is further reduced. The length X in the longitudinal direction of the insertion portion 21 is formed to be larger than the length in the axial direction of the tube body 10, and the base end portion a protrudes from the tube body 10 when disposed in the notch 11. It will be. The width Y of the insertion portion 21 is formed so that the interval between the notches 11 is larger than the inner diameter of the tubular body 10 in the expanded state by the thickness of the tubular body 10. Therefore, in the present embodiment formed as described above with respect to the thickness Z, the width Y is formed so as to gradually increase from the distal end portion b toward the proximal end portion a along with the shape of the thickness Z. ing. Furthermore, a plurality of recesses 22 are formed in the insertion portion 21 on the surface facing the cut surfaces 13 and 14 of the tubular body 10.

  The distal end b of the insertion portion 21 is provided with a substantially disc-shaped lid 24, and the shape of the lid 24 is equal to the internal shape of the distal end B of the tubular body 10 in the expanded state. It is formed to become. A folding surface 23 is formed on the base end a side of the insertion portion 21, and a plate-like operation unit 25 is fixed to the folding surface 23.

  Next, the operation of the present invention will be described. As described above, the present invention is used by inserting the gap widening imparting member 20 into the notch 11 formed in the tubular body 10. The gap widening imparting member 20 is inserted into the tube body 10 along the cut 11 from the base end A side where the guide cutout 12 is formed. At this time, the insertion portion 21 is inserted into the notch 11 against the elastic force of the tube body 10, and the insertion portion 21 is inserted into the tube body 10 while increasing the interval between the notch surfaces 13 and 14.

  As shown in FIG. 2, the cross-sectional area of the tubular body 10 is enlarged with an increase in the interval between the cut surfaces 13 and 14, and the tubular body 10 is in an enlarged state (the left figure in FIG. 2). Moreover, when the space | interval enlargement provision member 20 is slid to the base end part a side and removed from the tubular body 10 in the expanded state, the tubular body 10 is moved from the expanded state to the original state (FIG. 2). To the right).

  In addition, when the gap enlargement imparting member 20 is completely inserted into the tube body 10, the distal end portion B (the right end portion in FIG. 1) of the tube body 10 is closed by the lid portion 24. Since the shape of the lid portion 24 is formed to be equal to the internal shape of the distal end portion B of the tubular body 10 in the expanded state, the distal end portion B of the tubular body 10 is in a closed state.

  As described above, the insertion portion 21 is formed such that the thickness Z gradually increases from the distal end portion b toward the proximal end portion a. The degree of enlargement increases toward the end A side, and the overall shape becomes a tapered shape having a larger diameter toward the base end A side. Further, since the insertion portion 21 is formed so that the width Y thereof is larger than the inner diameter of the tubular body 10 in the expanded state, as shown in the left diagram of FIG. The inner side surface 21 a in the width direction of the portion 21 is in contact with the inner surface of the tube body 10, and the outer surface 21 b is positioned in the notch 11 so as to follow the outer peripheral shape of the tube body 10.

  Next, a drilling method using the concrete drilling jig of this embodiment will be described with reference to FIG. In general, as shown in FIG. 3A, a foundation structure 31 of a building is composed of a foundation bottom board 32 and a cloth foundation 33 provided on the upper part thereof. When the fabric foundation 33 is constructed, the formwork 30 is installed on the foundation base 32 formed in advance, and concrete is placed in the formwork 30.

  In order to form the hole 34 in the foundation structure 31 using the concrete drilling jig of the present embodiment, first, the formwork 30 was installed on the foundation bottom board 32 as shown in FIG. Later, the concrete drilling jig in which the tubular body 10 is in an expanded state is fixed at a predetermined position in the mold 30. At this time, it fixes so that the base end part A of the tubular body 10 may be located above the upper surface of the cloth base 33 planned. As a method for fixing the concrete drilling jig in the mold 30, any conventionally known method may be adopted. For example, it may be fixed to a reinforcing bar (not shown) arranged in the mold 30, or a concrete drilling jig may be suspended and fixed in the mold 30.

  After fixing the concrete drilling jig at a predetermined position in the mold 30, the fabric foundation 33 is formed by pouring the ready-mixed concrete into the mold 30 while avoiding the inside of the tubular body 10. And after concrete hardens | cures, while removing the frame 30, the hole part 34 is provided by drawing out the jig | tool for concrete drilling from the foundation structure 31. FIG.

  As shown in FIG. 3 (b), the concrete drilling jig is pulled out by holding the operation portion 25 and sliding the gap widening imparting member 20 in the direction of the base end a. Thus, when the space | interval enlargement provision member 20 is slid, the restoring force F which tries to restore | restore to the original state acts on the front-end | tip part B side of the pipe body 10 from which the space expansion provision member 20 was removed. By the action of the restoring force F, the distal end B side of the tube body 10 tends to be peeled off from the concrete, and a transition is made to the original state so that a gap S is formed between the outer peripheral surface of the tube body 10 and the concrete surface. Is done.

  Moreover, in this embodiment, while the thickness Z in the insertion part 21 of the space | interval enlargement provision member 20 is formed so that it may become large gradually toward the base end part a direction from the front-end | tip part b, the space | interval enlargement provision member 20 is provided. The degree of expansion of the inserted tubular body 10 increases toward the proximal end A side. Therefore, when the gap widening imparting member 20 is moved in the direction of the base end a with respect to the tubular body 10, the degree of expansion of the entire tubular body 10 is simultaneously reduced. Therefore, the restoring force F that acts when the gap widening imparting member 20 is slid in the direction of the base end a is not limited to the distal end B side of the pipe body 10 from which the gap widening imparting member 20 has been removed. It will occur simultaneously in the entire 10. Therefore, peeling of the outer peripheral surface of the tubular body 10 from the concrete surface proceeds smoothly, and when peeling from the concrete surface occurs in a part of the tubular body 10, the peeling phenomenon proceeds in a chain.

  And if the space | interval enlargement provision member 20 is slid to the predetermined position to the base end part a direction, peeling of the tubular body 10 from a concrete surface will advance, and the clearance gap S will spread over most holes 34, and a concrete surface The frictional force generated between the tubular body 10 and the gap widening imparting member 20 is larger than the frictional force generated between the tubular body 10 and the tubular body 10. Therefore, when a force for sliding in the base end portion A direction is further applied to the gap widening imparting member 20, the tubular body 10 moves integrally with the gap widening imparting member 20 in the base end portion A direction, The concrete drilling jig is pulled out from the foundation structure 31.

Next, operational effects in the present embodiment will be described below.
(1) In this embodiment, concrete is cast around the pipe body 10 in an expanded state, and the pipe body 10 is removed by its own restoring force by removing the spacing enlargement imparting member 20 from the pipe body 10 after the concrete is hardened. The tube 10 is restored to the original state, and the tubular body 10 is peeled from the concrete.

  As a result, the pipe body 10 is released from the compressive force during hardening of the concrete, and the concrete drilling jig can be easily pulled out from the concrete and can be reused. It can also be suppressed. Moreover, since the hole 34 can be provided in the foundation structure 31 by pulling out the concrete drilling jig of the present embodiment after placing the concrete, the step of cutting the concrete drilling jig unlike the conventional technique. Do not need.

  (2) In the present embodiment, the insertion portion 21 is formed such that its thickness Z increases from the distal end portion b toward the proximal end portion a. When the insertion portion 21 is inserted into the notch 11, the tube body 10 increases in degree of expansion toward the base end portion A side. Therefore, in the tubular body 10 in the expanded state, when the gap widening imparting member 20 is slid in the base end portion b direction, the degree of expansion of the entire tubular body 10 in the axial direction simultaneously decreases, and the tubular body 10 in the entire axial direction. A restoring force F acts. Therefore, when pulling out the tubular body 10 from the concrete, the separation of the tubular body 10 from the concrete can be caused smoothly and continuously.

  (3) In the insertion portion 21 of the present embodiment, a plurality of recesses 22 are formed on the surface facing the cut surfaces 13 and 14 of the tubular body 10, and when the insert portion 21 is inserted into the cut 11. The area in contact with the cut surfaces 13 and 14 is reduced. Therefore, the frictional resistance when sliding the gap widening imparting member 20 in the notch 11 is reduced, and the gap widening imparting member 20 can be smoothly slid.

  (4) The interval enlargement imparting member 20 of this embodiment includes an operation unit 25. By operating the gap widening imparting member 20 by holding the operating portion 25, the gap widening imparting member 20 can be smoothly slid and the work of pulling out the concrete drilling jig from the concrete can be easily performed. Can do.

  (5) In the present embodiment, by providing the lid portion 24, the elastic force of the tube body 10 is applied to the peripheral surface of the lid portion 24 when the interval increasing member 20 is slid in the axial direction of the tube body 10. Acts in a distributed manner. Therefore, the gap widening imparting member 20 can be slid straight and stably in the axial direction of the tubular body 10.

  (6) In the present embodiment, the shape of the lid portion 24 is formed to be equal to the internal shape of the distal end portion B of the tube body 10 in the expanded state, and the width Y of the insertion portion 21 is in the expanded state. The tube 10 is formed so as to be larger than the inner diameter of the tube 10 by the wall thickness. As a result, when the gap widening imparting member 20 is completely inserted into the tube body 10, the distal end portion B of the tube body 10 is closed by the lid portion 24 and the gaps 11 are also closed by the insertion portion 21. . Therefore, at the time of placing concrete, intrusion of concrete into the tube body 10 and between the cuts 11 is suppressed. Therefore, it is possible to provide a hole 34 that is open only at one end with respect to the foundation structure 31, and inconvenience at the time of forming the hole 34 due to the concrete intruding into the tube body 10 and between the cuts 11. Can be suppressed.

  Moreover, according to the said structure, the cover part 24 and the insertion part 21 are contact | abutted to the internal peripheral surface of the tubular body 10 in the expansion state. Therefore, the lid part 24 and the insertion part 21 also function as a support member for maintaining the shape of the tubular body 10 from an external pressure acting on the tubular body 10 such as a compressive force of concrete. Therefore, when the hole 34 is provided in the substructure 31, it is possible to suppress the shape of the tubular body 10 from changing.

  (7) In this embodiment, the tubular body 10 in the enlarged state is configured to be a tapered type whose diameter increases from the distal end portion B toward the proximal end portion A. Thereby, the shape of the hole 34 formed in the foundation structure 31 is also formed in a taper type in which the diameter increases toward the opening side. Therefore, when the concrete drilling jig is pulled out from the concrete, the occurrence of catching between the concrete surface, that is, the inner surface of the hole 34 and the outer peripheral surface of the tubular body 10 is suppressed, and the concrete structure 31 is drilled into the concrete. It is possible to smoothly pull out the jig.

  (8) In this embodiment, the thickness Z on the distal end b side of the insertion portion 21 is configured to be small, and a guide notch 12 is formed in the proximal end portion A of the tubular body 10. Yes. Therefore, the interval widening imparting member 20 can be easily inserted into the cut 11.

In addition, this embodiment can also be changed and embodied as follows.
-In this embodiment, although the pipe body 10 made from a vinyl chloride was used, the material of the pipe body 10 is not restricted to this, What is necessary is just the material which can be elastically deformed. For example, the tubular body 10 made of another resin material may be used, or a metallic tubular body 10 may be used.

-In this embodiment, although the tubular body 10 was formed in the cylindrical shape, the shape of the tubular body 10 is not restricted to this, You may form in a rectangular tube shape.
In the present embodiment, the cut 11 is formed linearly in the axial direction of the tube body 10, but the cut 11 may be formed in a spiral shape in the axial direction of the tube body 10. When formed in this way, not only the cross-sectional area of the tube body 10 but also the axial length of the tube body 10 can be expanded by the gap widening imparting member 20. Further, the guide notch 12 may not be provided.

  -In this embodiment, although the insertion part 21 was made into the elongate plate-shaped member, the shape of the insertion part 21 is not limited to this. For example, a rod-shaped member that can be inserted into the cut 11 may be used.

  Moreover, although the length X, the width Y, and the thickness Z of the insertion portion 21 are defined, the size of the insertion portion is not limited to this. For example, the length X only needs to be formed larger than the length (depth) of the hole 34 formed in the substructure 31 and is shorter than the axial length of the tubular body 10. May be. Further, the width Y may be smaller than that of the embodiment as long as it is at least as thick as the tubular body 10, or may be larger than the outer diameter of the tubular body 10 in an enlarged state. About thickness Z, you may form the insertion part 21 so that the thickness may become constant from the front-end | tip part b to the base end part a.

  -In this embodiment, although the recessed part 22 was provided in the insertion part 21 in multiple numbers, these may be integrated and it is good also as the single recessed part 22, and the recessed part 22 does not need to be provided. Further, the recess 22 may be a through hole that penetrates the insertion portion 21 in the thickness Z direction.

  -In this embodiment, although the cover part 24 was provided in the front-end | tip part b of the space | interval enlargement provision member 20, the cover part 24 does not need to be provided. In the case of such a configuration, for example, when the tube body 10 is arranged on the foundation structure 31, the tube body 10 is fixed so that the tip B of the tube body 10 abuts against the foundation bottom plate 32 or the formwork 30. It is possible to form the hole 34 in the foundation structure 31 by preventing the intrusion of concrete into the interior of the substructure 10.

  -In this embodiment, although the plate-shaped operation part 25 was provided in the space | interval enlargement provision member 20, the shape of the operation part 25 is not restricted to this. For example, a gripping hole or a handle may be provided in the vicinity of the base end portion a of the insertion portion 21, and the interval enlargement imparting member 20 may be operated by placing a hand on the gripping hole or the handle. Further, the operation unit 25 itself may not be provided.

  -In this embodiment, although the operation part 25 was being fixed to the insertion part 21, as shown in FIG. In another example of the interval enlargement imparting member 20 shown in FIG. 4, a connecting portion 26 is formed at the proximal end portion a of the insertion portion 21 instead of the folding surface 23. The shape of the connecting portion is formed to be equal to the internal shape of the proximal end portion A of the tubular body 10 in the enlarged state, and a female screw 26a is provided on the outer surface. The operating portion 25 having a T-shape is provided with a male screw 25 a, and the operating portion 25 is configured to be detachable from the connecting portion 26.

  According to the above configuration, even when a plurality of holes 34 are formed in the foundation structure 31 using a plurality of concrete drilling jigs, only one operation unit 25 is required, and a member used at a work site. The score can be reduced. Further, as shown in FIG. 5A, a horizontal hole 34 can be provided in the foundation structure 31. After the formwork 30 is installed on the foundation bottom plate 32, the concrete drilling jig in which the tubular body 10 is in an expanded state is fixed in a horizontal direction at a predetermined position in the formwork 30. At this time, it arrange | positions so that the base end part A may contact | abut with the formwork 30 at least. Then, after placing the concrete in the mold 30, the mold 30 is removed, and the operation unit 25 is coupled to the coupling unit 26 as shown in FIG. As a result, the horizontal hole 34 is provided. Therefore, the horizontal hole 34 can be provided in an arbitrary position in the foundation structure 31 without using a special formwork provided with a cylindrical part or the like for providing the hole 34.

  Further, the connection relationship between the connecting portion 26 and the operation portion 25 is not limited to screw connection. For example, one member of the operation unit 25 and the connecting unit 26 may be formed of a magnet, and the other member may be formed of a magnetic material and connected by magnetic force.

  -It is good also as a structure which connects and integrates the base end part a of the some space | interval expansion provision member 20. For example, as shown in FIG. 6, the base end portions a of the two sets of gap enlargement imparting members 20 are fixed to the connection member 27 to form the connection body 28. When this connection body 28 is used, since the two pipe bodies 10 are pulled out from the substructure 31 at the same time, the two holes 34 are formed at the same time, and the working efficiency is improved. In addition, since the interval between the two insertion portions 21 provided in the connection body 28 becomes the interval of the hole portion 34 formed in the foundation structure 31, the two hole portions 34 having a certain interval can be easily provided. Is possible. Furthermore, when the connection member 27 is provided with a function of adjusting the interval between the insertion portions 21, it becomes easy to adjust the interval between the hole portions 34 formed in the foundation structure 31 each time.

Next, a technical idea that can be grasped from the above embodiment and another example will be described.
A concrete drilling jig, characterized in that an operation portion is provided at a base end portion of the gap enlargement imparting member. According to the said structure, while being able to slide a space | interval expansion provision member smoothly, the drawing-out operation | work of the concrete drilling jig | tool from a foundation structure can also be performed easily.

  The concrete drilling jig is characterized in that the operation portion is detachable from the gap widening member. According to the above configuration, even when a plurality of holes are formed in the foundation structure using a plurality of concrete drilling jigs, only one operation unit is required, and the number of members used at the work site is reduced. be able to. In addition, since it becomes possible to attach the operation part after placing concrete, when a horizontal hole is provided in the foundation structure, a special formwork provided with a cylindrical part for providing the hole is provided. A horizontal hole can be provided at an arbitrary position in the substructure without using it.

  A non-contact portion that does not come into contact with the tubular body is formed on the surface of the gap enlargement imparting member facing the notch when the gap enlargement imparting member is inserted into the notch. Concrete drilling jig. According to the said structure, when the space | interval enlargement provision member is inserted in the cut of a tubular body, the contact area of a space | interval enlargement provision member and a cut becomes small. Therefore, the frictional resistance when the gap widening imparting member is slid in the notch is reduced, and the gap widening imparting member can be smoothly slid.

The perspective view which shows the jig | tool for concrete drilling of this embodiment. Sectional drawing of the tubular body of this embodiment. (A) (b) is a schematic diagram which shows the drilling method using the jig | tool for concrete drilling of this embodiment. The perspective view which shows the space | interval expansion provision member of another example. (A) (b) is a schematic diagram which shows the drilling method using the jig | tool for concrete drilling provided with the space | interval expansion provision member of another example. The perspective view which shows the space | interval expansion provision member of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tube, 11 ... Incision, 20 ... Space | interval enlargement provision member, 24 ... Lid part, 30 ... Formwork, 31 ... Substructure, 34 ... Hole part.

Claims (5)

A concrete drilling jig for providing a hole in a building foundation structure,
An elastically deformable tube body having an incision formed in the axial direction, and an interval expansion application that is inserted into the incision against the elastic force of the tube body and is slidable in the axial direction. A concrete drilling jig comprising a member. 2. The concrete drilling jig according to claim 1, wherein the gap enlargement imparting member is formed so that a thickness thereof increases from a distal end portion toward a proximal end portion. The gap enlargement imparting member is provided with a lid portion that closes the end opening of the tubular body at a distal end thereof, and the shape of the lid part is an internal shape of the tubular body in a state where the gap enlargement imparting member is inserted. The jig for drilling concrete according to claim 1 or 2, wherein the jig for drilling concrete is characterized in that The said pipe body and the said space | interval enlargement provision member are provided with two or more, The base end part of the said space | interval enlargement provision member is mutually connected, The concrete for drilling as described in any one of Claims 1-3 characterized by the above-mentioned. jig. The gap increasing member is inserted into the notch of the tubular body so that the tubular body is in an expanded state, and the expanded tubular body is placed in a formwork of a substructure, and concrete is cast into the formwork. The pipe body is peeled off from the concrete by removing the gap enlargement imparting member from the cut of the pipe body and restoring the pipe body to its original state after being installed. A drilling method using the concrete drilling jig described in one item.

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