JP2018126898A - Cutter blade, concrete core cutter, and method of forming hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easier to carry a concrete core cutter used for cutting a wall of a hollow concrete structure installed underground through an inlet into the concrete structure, and to reduce the labor and time required for the operation of forming a hole in the wall of the concrete structure.SOLUTION: A concrete core cutter (10) used for cutting a wall of a concrete structure (100) comprises: a cutter blade (12) consisting of an annular member (16) supporting a plurality of bits; a plurality of axial members (18) separably connected to the annular member and extending in the axial direction of the annular member; and radial members (20) each separably connected to the plurality of axial members and extending radially inward of the annular member. The annular member consists of a plurality of arcuate pieces (22) swingably and separably coupled to each other about an axis parallel to an axis of the annular member to deform the annular member into a non-annular shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutter blade, a concrete core cutter provided with the cutter blade, and a method for forming a hole in a wall of a concrete structure having an entrance installed in the ground using the concrete core cutter.

  Prevents damage to sewer pipes, which have lower strength than manholes, when there is relative movement between concrete structures installed in the ground, such as manholes, and sewer pipes connected to them due to live loads or seismic forces. For this reason, the connecting portion between the manhole and the sewer pipe is subjected to a flexible treatment. The flexible treatment is performed by cutting a manhole wall (casing) to form an annular hole around the sewer pipe, and then filling the annular hole with an elastically deformable water-stopping material.

  Cutting of the wall of the manhole for the flexure treatment is performed by installing a concrete core cutter having a cylindrical casing that supports a plurality of bits in the manhole. By the way, the diameter of the entrance of the manhole is relatively small. For this reason, it has been difficult to carry in the concrete core cutter through the entrance of the manhole. Such a situation also exists in the case of drilling a wall of a concrete structure such as a basement, or in the case of drilling a concrete structure such as a horizontal hole extending from an existing manhole to form another horizontal hole that branches from this. .

  In order to cope with such a situation, conventionally, a concrete core cutter case is composed of a plurality of case parts that are separably connected to each other in the circumferential direction, and individual case parts are carried into the interior through manhole entrances. It has been proposed to assemble the carried-in housing part in a manhole (see Patent Document 1 below). According to this, it is possible to easily carry in the concrete core cutter through the manhole entrance necessary for installing the concrete core cutter in the manhole.

JP 2001229554 A

  An object of the present invention is to make it easier to carry in a concrete core cutter through an entrance of a concrete structure installed in the ground in view of the above-described conventional circumstances. Moreover, this is to further reduce the labor and time required for forming a hole in the wall of the concrete structure.

  The present invention relates to a cutter blade of a concrete core cutter, and the cutter blade includes an annular member that supports a plurality of cutter bits. The annular member has a plurality of arcuate shapes that are slidably and detachably connected to each other around an axis parallel to the axis of the annular member so that the annular member can be transformed into a non-annular form. It consists of pieces.

  The cutter blade according to the present invention is formed of an annular member, and the annular member can swing with respect to each other around an axis parallel to the axis of the annular member so that the annular member can be transformed into a non-annular form. It consists of a plurality of arcuate pieces connected in a separable manner. According to the present invention, by releasing the mutual connection between two adjacent pieces constituting the annular member, a plurality of pieces are continuously connected in the vertical direction from the annular form, or The plurality of pieces can be deformed from an annular form to a folded form by swinging each other. The deformed configuration allows the cutter blade to be carried through the inlet into the concrete structure. Further, by making the support body of the plurality of bits into an annular member, the cutter blade through the entrance of the concrete structure installed in the ground, compared with the conventional one using this as a cylindrical casing, It is possible to more easily carry in the concrete core cutter including it.

  Two pieces adjacent to each other can be connected to each other through a pin bolt and nut assembly including a pin bolt and a nut screwed into the pin bolt, for example.

  The present invention also relates to a concrete core cutter. The concrete core cutter has a plurality of axial directions that are arranged at intervals around the cutter blade and an axis of the annular member that constitutes the cutter blade and that are separably connected to the annular member and extend in the axial direction of the annular member. A member, and a plurality of radial members that are arranged with a gap around the axis of the annular member and are detachably connected to the plurality of axial members, respectively, and extend radially inward of the annular member.

  According to the present invention, the concrete core cutter can be separated and disassembled into an annular member constituting the cutter blade, a plurality of axial members, and a plurality of radial members. These disassembled members can be carried through the entrance into the concrete structure and can be assembled in the concrete structure. Furthermore, the concrete core cutter can be subdivided by configuring the concrete core cutter with the annular member and an axial member and a radial member detachably connected thereto. Accordingly, the concrete core cutter can be more easily carried into the concrete structure through the entrance of the concrete structure installed in the ground, and the concrete structure including the work of carrying in the member is performed. It is possible to further reduce the labor and time required for forming the hole in the wall of the object.

  The plurality of axial members and the plurality of radial members are spaced apart from each other around the axis of the annular member, and spaced apart from each other around the axis of the annular member; can do. According to this, the axial member and the radial member can be reduced in size and weight, and thereby the axial member into the concrete structure through the entrance of the concrete structure and The carrying-in operation of the radial member, and thus the carrying-in operation of the concrete core cutter can be facilitated.

  Each piece has both ends, each end having an overhanging portion projecting in the axial direction of the annular member and a joint portion extending from the overhanging portion in the circumferential direction of the annular member, and two pieces adjacent to each other Are connected to each other at these two joint portions, and each axial member may be connected to the annular member at the protruding portion of the two ends of two adjacent pieces. According to this, since the overhanging portion has higher mechanical strength than other portions, the interconnection between the annular member and the axial member can be made stronger, and by this interconnection, The unity between two adjacent pieces of the ring member can be made stronger.

  The present invention further relates to a method for forming a hole in the wall of a concrete structure having an entrance provided in the ground using the concrete core cutter. The hole is formed by installing the prepared concrete core cutter inside the concrete structure, and then cutting the wall of the concrete structure by rotating the concrete core cutter. Here, the installation of the concrete core cutter in the concrete structure includes the annular member, a plurality of axial members separated from the annular member, and a plurality of radial members separated from the axial member. Are respectively carried through the entrance of the concrete structure into the concrete structure, and thereafter, these loaded members are connected to each other in the concrete structure.

  According to the present invention, by using the subdivided concrete core cutter, it is possible to further reduce labor and time required for forming a hole in the wall of the concrete structure as compared with the conventional case.

It is a perspective view which shows an example of a concrete core cutter. It is a disassembled perspective view of the concrete core cutter shown in FIG. FIG. 2 is a perspective view of the cutter blade of the concrete core cutter shown in FIG. 1 in a state in which two adjacent pieces constituting the cutter blade are separated. FIG. 4 is a perspective view of the cutter blade shown in FIG. 3, in which a plurality of pieces constituting the cutter blade are deformed into an elongated chain shape continuously connected in the vertical direction. It is a perspective view which shows the state which attaches the some radial direction member which makes a part of concrete core cutter shown in FIG. 1 to a part of rotation drive device. It is a perspective view which shows the state which connects the some axial direction member which makes a part of concrete core cutter shown in FIG. 1 with a some radial direction member, respectively. It is a perspective view which shows the state which connects the cutter blade which makes a part of concrete core cutter shown in FIG. 1 to several axial direction members. It is the perspective view of the concrete core cutter shown in FIG. 1 which completed the attachment to a part of rotation drive means. It is a schematic cross-sectional view of a manhole in a state where a rotation driving device for a concrete core cutter is installed in the manhole in order to form a hole in the manhole wall. It is a schematic cross-sectional view of a manhole in a state where a plurality of radial members of a concrete core cutter are attached to a rotary drive device in the manhole. It is a schematic cross-sectional view of a manhole in a state where a plurality of axial members are connected to a plurality of radial members in the manhole, respectively. It is a schematic cross-sectional view of a manhole in a state where cutter blades are connected to a plurality of axial members in the manhole. It is a cross-sectional view of the manhole in the state in which the hole is formed in the wall of the manhole by the concrete core cutter. It is a cross-sectional view of the manhole in the state where the formation of holes by the concrete core cutter has been completed. It is a schematic longitudinal cross-sectional view of the manhole in the state shown in FIG. It is a perspective view which shows the concrete core cutter containing the cutter blade of another example. It is a perspective view which shows the concrete core cutter containing the cutter blade of another example. It is a perspective view of the concrete core cutter containing the cutter blade of another example. FIG. 17 is a front view schematically showing a state in which a plurality of pieces constituting the cutter blade shown in FIG. 16 are deformed into an elongated chain shape continuously connected in the vertical direction. FIG. 18 is a front view schematically showing a state in which a plurality of pieces constituting the cutter blade shown in FIG. 17 are deformed into an elongated chain shape continuously connected in the vertical direction. It is a front view which shows roughly the state by which the some piece which comprises the cutter blade shown in FIG. 1 was deform | transformed into the folded form. FIG. 19 is a front view schematically showing a state in which a plurality of pieces constituting the cutter blade shown in FIG. 18 are deformed into a long and slender chain shape continuously connected in the vertical direction.

  Referring to FIGS. 1 and 2, a concrete core cutter according to an embodiment of the present invention is indicated generally by the numeral 10.

  The concrete core cutter 10 is provided on the wall of the concrete structure 100 to form a hole 105 (FIG. 14) in the wall 104 (FIG. 9) of the concrete structure 100 provided in the ground and having an inlet 102 (FIG. 4). 104 can be used for cutting. A concrete structure 100 shown in FIG. 9 includes a manhole as an example. The formation of the hole 105 using the concrete core cutter 10 is performed according to the hole forming method according to the present invention described later with reference to FIGS. ) And the sewer pipe 106 (FIG. 9). When the hole 105 is formed, the concrete core cutter 10 is connected to a rotation driving device 108 described later in the concrete structure 100 and is driven to rotate around its axis.

  The concrete core cutter 10 includes a cutter blade 12 that is a component having a function of exerting a cutting action on the wall 104 of the concrete structure 100. The cutter blade 12 includes a plurality of bits 14 and an annular member 16 that supports these bits 14. The concrete core cutter 10 is further connected to the annular member 16 in a separable manner, and includes a plurality of axial members 18 extending in the axial direction of the annular member 16, that is, in the extending direction of the axis L (FIG. 2) of the annular member 16. Each of the directional members 18 is detachably connected to the directional member 18 and extends radially inward of the annular member 16, that is, extends in the plane orthogonal to the axis L toward the axis L. Both the axial direction member 18 and the radial direction member 20 form parts that support the cutter blade 12 and have a function of transmitting the rotational driving force of the rotational driving device 108 to the cutter blade 12.

  The annular member 16 includes a plurality (four in the illustrated example) of arc-shaped pieces 22. The four pieces 22 are connected to each other via four pin bolt and nut assemblies 24 extending in parallel with the axis L of the annular member 16. As a result, the four pieces 22 can swing around an axis parallel to the axis L of the annular member 16 and can be separated from each other. The pin bolt / nut assembly 24 includes a pin bolt 24a and a nut 24b screwed to the pin bolt 24a (FIG. 3). The plurality of bits 14 are arranged and fixed at intervals in the circumferential direction on one of two circumferential side surfaces that are continuous with both the inner and outer circumferential surfaces of the annular member 16 and are opposed to each other. The quantity of bits 14 can be set arbitrarily. The bit 14 is made of, for example, a diamond tip.

  As shown in FIG. 3, each piece 22 includes both end portions 22a in the circumferential direction and an intermediate portion 22b between both end portions 22a. Each end 22a has a projecting portion 26 projecting from the other one of the circumferential side surfaces of the annular member 16 in the axial direction of the annular member 16, and a plate-shaped joint portion 28 extending from the projecting portion in the circumferential direction of the piece 22. And have. The overhanging portion 26 has a greater length or thickness dimension with respect to the axial direction than the intermediate portion 22b of the piece 22, and thus has a relatively high mechanical strength. On the other hand, the joint portion 28 has a smaller thickness dimension than the intermediate portion 22b. The two pieces 22 adjacent to each other are overlapped with each other at the joint portions 28 at the two ends, and the pin bolts 24a of the pin bolt nut assembly 24 pass through the overlapped joint portions 28.

  The cutter blade 12 removes one pin bolt and nut assembly 24 from two pieces 22 adjacent to each other, thereby changing the four pieces 22 from an annular form ((FIGS. 1 and 2) to one of non-annular forms. 4 can be deformed into a long and slender chain shape continuously connected in the vertical direction (FIG. 4), and the cutter blade 12 has a manhole through the inlet 102 of the relatively small manhole 100. The cutter blade 12 can also be moved from an annular configuration to another non-annular configuration by sliding the four pieces 22 around each of the four pin bolt nut assemblies 24, respectively. It can be transformed into a certain folded form (see FIG. 14), and this form also allows the manhole 100 to pass through its inlet 102. It can be carried into the easy.

  Although the number of the axial members 18 and the number of the radial members 20 can be arbitrarily set, it is desirable that the number of pieces 22 constituting the cutter blade 12 is the same, that is, four. Further, the four axial members 18 and the four radial members 20 can be in contact with each other around the axis L, respectively. However, the four axial members 18 may be arranged around the axis L at a distance from each other, and the four radial members 20 may be arranged with a gap around the axis L. desirable. In the example shown in the drawing, the four axial members 18 are arranged at intervals in the circumferential direction on a surface (cylindrical surface) obtained by extending the outer peripheral surface of the annular member 16 in the axial direction. These four axial members 18 define a cylindrical space through which a guide rod 110 (FIG. 9) described later is passed. The four radial members 20 are arranged on the plane orthogonal to the axis L with a fan-shaped gap around the axis L. According to this, the size reduction of these can be achieved on the form of the axial direction member 18 and the radial direction member 20. FIG.

  As shown in FIG. 2, each axial member 18 has a plate-like main body 18a and two elongated joint plates 18b and 18c fixed to both ends in the longitudinal direction of the main body, that is, the axial direction, and facing each other. Can be. The main body 18 a is formed of a curved plate that is curved with substantially the same curvature as the outer peripheral surface of the annular member 16. Each joint plate 18b, 18c is formed of a narrow flat plate that is curved and extends in the circumferential direction of the main body 18a with substantially the same curvature as the main body. Both end portions thereof protrude from the end of the main body 18a in the circumferential direction. Yes. Each joint plate 18b, 18c also has a width dimension that is the same as the thickness dimension of the overhanging portion 26 of the piece 22 of the cutter blade 12.

  Each axial member 18 is in contact with two projecting portions 26 of two pieces 22 adjacent to each other constituting the annular member 16 in one joint plate 18b. Further, two bolts 32 extending through the two holes 30 provided in the joint plate 18 b are respectively screwed into two screw holes (not shown) provided in the two overhang portions 26. Thereby, each axial direction member 18 is connected to the annular member 16 so as to be separable. Each separated axial member 18 can also be easily carried into the manhole 100 through the inlet 102 of the manhole 100, similarly to the cutter blade 12.

  On the other hand, each radial direction member 20 consists of a flat plate, and has the outer side surface 20a and the inner side surface 20b which face the outer side and inner side of the radial direction of the annular member 16 which comprises the cutter blade 12, respectively. The outer surface 20a of each radial member 20 is curved with substantially the same curvature as the joint plate 18b of the axial member 18, and the inner surface 20b is curved with a curvature smaller than the curvature.

  Each radial member 20 is in contact with the other joint plate 18 c of each axial member 18. Further, two bolts 33 extending through the other two holes 31 provided in the joint plate 18c are respectively screwed into the two screw holes 34 provided in the radial members 20 adjacent to the outer surface 20a. Yes. Thereby, each radial direction member 20 is connected to each axial direction member 18 so that separation is possible. The four outer surfaces 20a of the four radial members 20 are on a surface (cylindrical surface) obtained by extending the outer peripheral surface of the annular member 16 in the axial direction, and the four inner surfaces 20b are guide rods 110 (see FIG. 9). A circular hole through which is passed). Each separated radial member 20 can also be easily carried into the manhole 100 through the inlet 102 of the manhole 100, similarly to the annular member 16 and each axial member 18.

  The annular member 16, the four axial members 18 and the four radial members 20 constituting the cutter blade 12 carried into the manhole 100 can be connected to each other and assembled in the manhole 100, thereby providing a concrete core cutter. 10 so that the concrete core cutter 10 can be installed in the manhole 100.

  In assembling the concrete core cutter 10, first, the four radial members 20 around the axis L are placed on a wheel 112 (FIGS. 5 and 10) that forms a part of the rotary drive device 108 previously installed in the manhole 100. Are attached at an angular interval of 90 degrees. As shown in FIG. 5, the wheel 112 is provided with a plurality of holes 113 and a plurality of protrusions 114 spaced from each other in the circumferential direction. On the other hand, each radial member 20 is provided with two screw holes 36 at a position close to the inner side surface 20b (see FIG. 2) and one hole 38 between the screw holes 36. Each radial member 20 is releasably fixed to the wheel 112 by a bolt 115 screwed into each screw hole 36 of each radial member 20 through each hole 113 of the wheel 112. Further, the protrusion 114 of the wheel 112 is fitted in the hole 38 of each radial member 20. Thereby, smooth transmission of the rotational power from the wheel 112 to the radial member 20 is enabled.

  Next, as shown in FIG. 6, each axial member 18 is connected to each radial member 20 fixed to the wheel 112 using two bolts 33 (only one is shown) (see FIG. 6). 11) Yes. Finally, as shown in FIG. 7, the annular member 16 (the cutter blade 12 is connected to each axial member 18 connected to each radial member 20 by using two bolts 32 (only one is shown). ). Thereby, the installation of the concrete core cutter 10 in the manhole 100 and the attachment of the concrete core cutter to the rotation drive device 108 can be completed (FIGS. 8 and 12).

  The rotation drive device 108 to which the concrete core cutter 10 is attached includes a hydraulic motor (not shown) that is a rotation drive source. As shown in FIGS. 9 and 15, the rotary driving device 108 supports the space above the bottom plate 117 of the manhole 100 movably along the guide rod 110 on the guide rod 110 extending along the extension of the axis of the sewer pipe 106. Has been. The guide rod 110 is fixed at one end thereof to a plate member 116 fixed to the inner wall surface of the manhole 100. Moreover, the guide rod 110 is fixed to a centering member 118 disposed inside the sewer pipe 106 at the other end, and is supported by the sewer pipe 106 via the centering member. The guide rod 110 includes a circular opening 120 (FIG. 5) provided at the center of the wheel 112 of the rotation drive device 108, the circular space defined by the four radial members 20, and the four axial members 18. It extends along the axis of the concrete core cutter 10, that is, the axis L of the annular member 16 through the cylindrical space to be defined and the circular opening of the annular member 16.

  The rotary drive device 108 is also connected to a propulsion device (not shown) such as a hydraulic jack housed in an elongated box 122 disposed in the upper space and extending horizontally in the manhole 100. More specifically, it is connected to the propulsion device via a connecting member 124 (FIG. 15) provided on the bottom surface of the box 122 and extending through a slit (not shown) extending in the longitudinal direction. The box 122 is fixed to the inner wall surface of the manhole 100 and the plate member 116 at both ends thereof. The rotary drive device 108 can propel the guide rod 110 toward the sewer pipe 106 and move it in the opposite direction by operating the propulsion device.

  After the concrete core cutter 10 is installed in the manhole 100, that is, after the concrete core cutter 10 is attached to the rotation drive device 108, the rotation drive device 108 is operated to rotate the concrete core cutter 10 around the axis L, Further, the propulsion device in the box 122 is operated, and the rotating cutter blade 12 is pressed against the wall 104 of the manhole 100 and further pushed forward. Thereby, the wall 104 can be cut (FIG. 13), and the annular hole 105 can be formed around the sewer pipe 106. Then, in order to perform the said flexible process, the cyclic | annular hole 105 is filled with the water stop material (not shown) which can be elastically deformed like silicone.

  Instead of the example shown in FIG. 1, the concrete core cutter 10 includes, for example, a cutter blade 12 constituted by an annular member 16 composed of two pieces 22, two axial members 18, and two radial members 20. What is provided (FIG. 16) What is provided with the cutter blade 12 comprised by the annular member 16 which consists of the three pieces 22, the three axial direction members 18, and the three radial direction members 20 (FIG. 17), six A cutter blade 12 composed of an annular member 16 made up of pieces 22, six axial members 18, and six radial members 20 (FIG. 18) can be used.

  As shown in FIG. 19, the cutter blade 12 constituted by the annular member 16 composed of two pieces 22 has an elongated chain shape (non-annular shape) in which the two pieces 22 are continuously connected in the vertical direction from the annular shape. Form). Similarly, the cutter blade 12 composed of the annular member 16 composed of the three pieces 22 is also deformed from an annular shape into an elongated chain shape (non-annular shape) in which the three pieces 22 are continuously connected in the vertical direction. (FIG. 20). Similarly, the cutter blade 12 constituted by the annular member 16 composed of six pieces 22 also has an elongated chain shape (non-annular form) in which the six pieces 22 are continuously connected in the vertical direction from the annular shape. (FIG. 22). The cutter blade 12 composed of six pieces 22 is also changed from an annular form to a folded form (non-annular form) by swinging the six pieces together like the cutter blade 12 composed of six pieces 22. And can be transformed.

10 concrete core cutter 12 cutter blade 14 bit 16 annular member 18 axial member 20 radial member 22 piece 100 manhole (concrete structure)
102 Manhole entrance 104 Manhole wall 106 Sewer pipe 108 Rotation drive

Claims (6)

A cutter blade of a concrete core cutter,
It consists of an annular member that supports multiple bits,
The annular member has a plurality of arcuate shapes that are slidably and detachably connected to each other about an axis parallel to the axis of the annular member so as to be able to transform it into a non-annular form. A cutter blade consisting of pieces.   The cutter blade according to claim 1, wherein two pieces adjacent to each other are connected to each other via a pin bolt and nut assembly including a pin bolt and a nut screwed into the pin bolt. A cutter blade comprising an annular member supporting a plurality of bits, the annular member swinging relative to each other about an axis parallel to the axis of the annular member so as to be able to deform it into a non-annular form. A cutter blade comprising a plurality of arcuate pieces connected movably and separably;
A plurality of axial members that are separably connected to the annular member and extend in the axial direction of the annular member;
A concrete core cutter comprising a plurality of radial members connected to a plurality of axial members in a separable manner and extending radially inward of the annular member.   The concrete core cutter according to claim 3, wherein the plurality of axial members are disposed at intervals around the axis of the annular member, and are disposed with a gap around the axes of the plurality of annular members. Each piece includes both end portions, each end portion having an overhanging portion projecting in the axial direction of the annular member, and a joint portion extending from the overhanging portion in the circumferential direction of the annular member,
Two pieces adjacent to each other are connected to each other at these two joint portions, and each axial member is connected to the annular member at a protruding portion of two ends of the two pieces adjacent to each other. The concrete core cutter according to claim 3. A method of forming a hole in a wall of a concrete structure having an entrance provided in the ground,
Preparing the concrete core cutter according to any one of claims 3 to 5,
Installing the concrete core cutter inside the concrete structure, and then cutting the wall of the concrete structure by rotating the concrete core cutter;
Installation of the concrete core cutter in the concrete structure is separated from the annular member transformed into a non-annular form, a plurality of axial members separated from the annular member, and the axial member. A method of forming a hole, wherein a plurality of radial members are carried into the concrete structure through an inlet thereof, and thereafter, these members are connected to each other.

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