JP5123441B1 - Anchor unit, foundation and foundation construction method, leveling method - Google Patents

Abstract

[PROBLEMS] To easily perform leveling work without reducing the strength of a foundation of a building.
An anchor unit 10 incorporated in a foundation structure of a building has an anchor pipe 20 having at least an upper end opened and an internal thread portion 23 formed along an inner periphery of the upper end portion, and an outer periphery of the lower end portion. The upper end portion of the anchor pipe 20 is formed by engagement of the female screw portion 23 and the male screw portion 31, and a male screw portion 31 formed along the inner periphery. And a male screw part 41 that is formed along the outer periphery and meshes with the female screw part 33. The female screw part 33 and the male screw part 41 are meshed with each other, and the lower end part is an anchor pipe. 20 and an anchor bolt 40 inserted into the interior space.
[Selection] Figure 2

Description

  The present invention relates to an anchor unit used for a foundation of a building, a foundation and foundation construction method using the anchor unit, and a leveling method.

  The construction of building foundations and foundations is generally performed in the following procedure. First, when the supporting ground is soft ground, ground improvement is performed in order to prevent uneven settlement of the building. For example, a solidifying agent such as slurry is mixed in the ground for ground improvement. Subsequently, the foundation concrete is placed on the improved support ground, and the foundation of the building is installed on the foundation concrete. At this time, the foundation concrete and the foundation of the building are connected by anchor bolts.

  As an anchor bolt used for such construction, for example, in Patent Document 1, when a screw is tightened, the sleeve expands upward and buckles and bites into the concrete floor or wall surface, thereby improving the support strength. Are disclosed. Japanese Patent Application Laid-Open No. H10-228667 discloses a reinforcing rib that protrudes from the outer peripheral surface along the axis to prevent rotation during nut tightening.

  However, even if the ground is improved, there is a possibility that the buildings will be subsidized. If the building is tilted due to uneven settlement, leveling work will be performed to return the building base to a horizontal state by lifting the building base from the foundation concrete.

  In leveling work, it is necessary to cut anchor bolts when lifting the foundation of the building from the foundation concrete. Hereinafter, a conventional leveling procedure will be described in detail. First, the foundation concrete around the anchor bolts is destroyed. Thereby, the exposed anchor bolt and the reinforcing bar are cut. Next, use a jack or the like to lift the foundation of the building against the foundation concrete. At this time, a support is inserted into the gap formed between the foundation concrete and the base of the building to support the base of the building. Join the cut anchor bolts and reinforcing bars by attaching steel to them. Finally, the concrete is again placed in the part where the foundation concrete is destroyed.

JP 2008-101449 A JP 2011-001997 A

  The leveling method described above has the following problems. First, the destroyed foundation concrete and the cut anchor bolts and reinforcing bars do not return to their original strength. For this reason, the leveling method described above reduces the strength of the foundation. Gas cutters and high-speed cutters are used to cut anchor bolts and rebars, but these involve a fire hazard unless used in consideration of the surrounding environment. The same applies to the welding operation. Furthermore, since welding work can only be performed by qualified personnel, the number of people who can perform construction is limited.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to enable easy leveling work without reducing the strength of the foundation of a building.

  (1) An anchor unit according to the present invention is formed along an outer circumference of an anchor pipe having at least an upper end and having a first threaded portion formed along an inner circumference of the upper end, and an outer circumference of the lower end. A second threaded portion that meshes with the first threaded portion, and a third threaded portion formed along the inner periphery, and the first threaded portion and the second threaded portion And an annular fastening member fastened to the upper end portion of the anchor pipe, and a fourth screw portion that is formed along the outer periphery and meshes with the third screw portion. And an anchor bolt having a lower end portion inserted into the interior space of the anchor pipe.

  According to this configuration, the anchor bolt can be moved in the longitudinal direction with respect to the anchor pipe by releasing the fastening of the fastening member to the anchor pipe. Therefore, the total length of the anchor bolt can be easily changed based on the distance between the leveled foundation concrete and the foundation of the building. That is, it is not necessary to cut the anchor bolt in the leveling operation. Moreover, since each member is connected by the engagement of the screws, sufficient tensile strength can be ensured.

  (2) The intervals between the threads of the first screw portion, the second screw portion, the third screw portion, and the fourth screw portion may be equal to each other.

  According to this structure, only a fastening member can be rotated with respect to both, without rotating an anchor pipe and an anchor bolt relatively. That is, the fastening of the fastening member with respect to the anchor pipe and the release of the fastening are easily performed in a state where the entire length of the anchor unit is maintained.

  (3) The anchor bolt may have a groove on the upper end surface.

  According to this configuration, for example, by inserting a protrusion such as a metal fitting attached to the base of the building into the concave groove of the anchor bolt, rotation of the anchor bolt with respect to the base of the building can be prevented. Thereby, when rotating a fastening member with respect to an anchor bolt, it can prevent that both rotate integrally.

  (4) The anchor pipe may be provided at the lower end with a flat plate having a rectangular shape in a plan view and projecting laterally from the lower end.

  The support strength of the anchor pipe with respect to the foundation concrete is improved by the flat plate.

  (5) The upper end portion of the fastening member may be located above the upper end of the anchor pipe, and the outer periphery may be polygonal.

  According to this structure, the fastening of the fastening member with respect to the anchor pipe or the release of the fastening is easily performed using a tool such as a spanner.

  (6) The present invention can also be regarded as a construction method for constructing the foundation and foundation of a building by the anchor unit. In the foundation and foundation construction method according to the present invention, the foundation concrete is placed around the anchor unit supported with the longitudinal direction of the anchor bolt as a vertical direction, and the anchor pipe is buried in the foundation concrete. Placing the foundation of the building on the solidified foundation concrete, the anchor bolt protruding from the foundation concrete penetrating the foundation of the building, the anchor bolt and the foundation of the building And a base installation process for fastening

  The anchor unit according to the present invention is incorporated into the foundation and foundation of a building, for example, by the method as described above.

  (7) In the foundation installation step, a packing that exposes an upper end portion of the fastening member may be interposed between the foundation concrete and the foundation.

  Since a gap is formed between the foundation concrete and the foundation by the packing, it is easy to rotate the fastening member.

  (8) In the foundation concrete placing step, a recessed portion having a space in which the fastening member can rotate may be formed on the upper surface of the foundation concrete.

  In this structure, it is prevented that rotation of a fastening member is inhibited by foundation concrete.

  (9) The foundation and foundation construction method according to the present invention may further include a fitting attachment step of attaching the first fitting having a protrusion to the anchor bolt and the building foundation. The first metal fitting is fixed to the base of the building in a state where the protrusion is inserted into a groove formed at the upper end of the anchor bolt.

  Such a metal fitting prevents the anchor bolt from rotating with respect to the base of the building. Therefore, when the fastening member is rotated with respect to the anchor bolt, both are prevented from rotating together.

  (10) In the foundation concrete placing step, the anchor unit is attached to the framework via a second metal fitting having a hook hooked on the framework of the foundation concrete and a hole through which the anchor pipe is inserted. It may be attached.

  According to this configuration, the anchor bolt is prevented from being inclined or falling down due to the poured concrete. Moreover, it is easy to attach the anchor bolt to the frame by such a metal fitting.

  (11) The present invention can also be regarded as the foundation and foundation of a building constructed by the construction method of the foundation and foundation.

  (12) The present invention can also be regarded as a leveling method applied to the foundation of the building. The leveling method according to the present invention includes a fastening release step for releasing the fastening of the fastening member to the anchor pipe, and a jack lifting the foundation of the building from the foundation concrete in a state where the fastening of the fastening member is released. A lifting step of sliding the anchor bolt with respect to the anchor pipe, and a refastening step of fastening the fastening member to the upper end of the anchor pipe in a state where the base of the building is lifted by a jack. .

  Such a leveling method is easily constructed in a short time. In addition, since it is not necessary to cut the anchor bolt, the strength of the foundation of the building does not decrease after the leveling work.

  According to the present invention, leveling work can be easily performed without reducing the strength of the foundation of the building.

FIG. 1 is a perspective view of an anchor unit 10 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the anchor unit 10. FIG. 3 is a cross-sectional view along the longitudinal direction of the anchor unit 10. FIG. 4A is a perspective view showing a state in which the anchor unit 10 is attached to the frame 52 before the foundation concrete 50 is placed. FIG. 4B is a cross-sectional view showing the state of FIG. FIG. 5 is a perspective view showing details of attachment of the anchor unit 10 to the metal fitting 55. (A) shows the state immediately before attachment, and (B) shows the state after attachment. FIG. 6 is a cross-sectional view showing the periphery of the anchor unit 10 immediately after the foundation concrete 50 is placed. FIG. 7A is a cross-sectional view showing a state in which the foundation concrete 50 and the base 51 are connected by the anchor unit 10. FIG. 7B is a perspective view showing the metal fitting 64. FIG. 8 is a cross-sectional view showing the periphery of the anchor unit 10 in the leveling work. (A) has shown the state from which the O-ring 58 was removed and the fastening nut 30 was released. (B) has shown the state by which the foundation 51 was lifted with the jack after (A). (C) shows a state in which the fastening nut 30 is fastened to the upper end of the anchor pipe 20 after (B). (D) shows a state in which the prism portion 32 is covered with the cap 69 after (C). FIG. 9 is a view showing a state in which the base 51 is jacked up by the jack mechanism 94. FIG. 10 is a cross-sectional view showing a state immediately before the mortar is poured into the gap 61 after the leveling of the base 51 is completed. FIG. 11A is a cross-sectional view showing a state in which the foundation concrete 50 and the core 80 are connected by the anchor unit 10 in a modification of the embodiment. FIG. 11B is a perspective view showing the metal fitting 83.

[Outline of Anchor Unit 10]
The anchor unit 10 shown in FIGS. 1 to 3 is configured such that the anchor pipe 20 and the anchor bolt 40 are connected by a fastening nut 30 in a state where a rod-like anchor bolt 40 is inserted into a cylindrical anchor pipe 20. is there. The anchor bolt 40 can be positioned at an arbitrary position in the longitudinal direction with respect to the anchor pipe 20. Thereby, the anchor unit 10 can be expanded and contracted in the longitudinal direction.

  The anchor unit 10 is used to connect the foundation concrete 50 (FIG. 7A) placed on the ground and the foundation 51 of the building (FIG. 7A). In the event of uneven settlement of the building, a leveling work is performed in which the foundation 51 is lifted from the foundation concrete 50 and returned to a horizontal state. The distance between the foundation 51 and the foundation concrete 50 is increased by the leveling work. The anchor unit 10 according to the present embodiment can easily cope with a change in the interval between the foundation 51 and the foundation concrete 50 by expanding and contracting in the longitudinal direction. Hereinafter, each member which comprises the anchor unit 10 is demonstrated in detail.

[Anchor pipe 20]
The anchor pipe 20 shown in FIGS. 1-3 is manufactured from metal materials, such as steel, and has the substantially cylindrical external appearance. The lower end of the anchor pipe 20 is closed by a rectangular closing plate 21 (an example of a flat plate of the present invention) in plan view. The blocking plate 21 is also manufactured from a metal material such as steel. The closing plate 21 is attached to the lower end of the anchor pipe 20 by a method such as welding. Further, an enlarged diameter portion 22 having a partially increased outer diameter and inner diameter is formed at the upper end portion of the anchor pipe 20. As shown in FIGS. 2 and 3, the upper end of the enlarged diameter portion 22 is opened, and the interior space of the anchor pipe 20 is communicated with the outside. A thread is cut along the inner periphery of the enlarged diameter portion 22, and a female screw portion 23 (an example of the first screw portion of the present invention) is formed. The female screw portion 23 is for fastening a fastening nut 30 described later to the upper end of the anchor pipe 20. Although not shown in the figure, the female screw portion 23 has a gentle taper shape. That is, the inner diameter of the enlarged diameter portion 22 is gradually reduced toward the lower side.

  The dimensions of the anchor pipe 20 are appropriately determined by those skilled in the art based on the rigidity required when the anchor pipe 20 is incorporated in the foundation structure of the building, the depth at which the anchor pipe 20 is buried in the foundation concrete 50, and the like. . As an example, the outer diameter of the anchor pipe 20 is about 20 to 30 mm, and the inner diameter is about 15 mm to 20 mm. The total length of the anchor pipe 20 is about 200 to 400 mm.

  The anchor pipe 20 can be manufactured from two types of cylinders having different outer diameters and inner diameters. That is, the anchor pipe 20 may be one in which a cylindrical body corresponding to the enlarged diameter portion 22 and a cylindrical body corresponding to other portions are joined and welded in the longitudinal direction.

[Fastening nut 30]
The fastening nut 30 shown in FIGS. 1 to 3 connects the anchor pipe 20 and the anchor bolt 40. As shown in FIGS. 2 and 3, the lower end side of the fastening nut 30 has a cylindrical shape. A thread is cut along the outer periphery of the cylinder, and a male thread part 31 (an example of a second thread part of the present invention) that engages with the female thread part 23 of the anchor pipe 20 is formed. Thereby, the fastening nut 30 is fastened to the upper end of the anchor pipe 20. Although not shown in the figure, the male screw portion 31 has a tapered shape corresponding to the female screw portion 23. On the upper side of the male screw portion 31, a prism portion 32 having a generally hexagonal prism shape is formed. The maximum diameter of the prism portion 32 is larger than the outer diameter of the male screw portion 31. When the fastening nut 30 is fastened to the anchor pipe 20, the rectangular column part 32 is a part to which torque is applied by a tool such as a spanner. As shown in FIGS. 1 and 3, in a state where the fastening nut 30 is fastened to the anchor pipe 20, the prismatic part 32 is located above the upper end of the anchor pipe 20.

  As shown in FIGS. 2 and 3, the fastening nut 30 has an internal space into which the anchor bolt 40 is inserted along the longitudinal direction. That is, the fastening nut 30 is generally annular. A thread is cut along the inner periphery of the prism portion 32, and a female screw portion 33 (an example of a third screw portion of the present invention) is formed.

[Anchor bolt 40]
The anchor bolt 40 shown in FIGS. 1 to 3 is manufactured from a metal material such as steel, like the anchor pipe 20. The anchor bolt 40 has a round bar-like appearance. A thread is cut along the outer peripheral surface of the anchor bolt 40, and a male screw portion 41 (an example of a fourth screw portion of the present invention) that meshes with the female screw portion 33 of the fastening nut 30 is formed. The male screw portion 41 is formed over the entire length of the anchor bolt 40.

  As shown in FIG. 3, the anchor bolt 40 is inserted into the fastening nut 30 and the anchor pipe 20 in a state where the male screw portion 41 is engaged with the female screw portion 33 of the fastening nut 30. That is, the anchor bolt 40 is fixed to the anchor pipe 20 via the fastening nut 30. The lower end of the anchor bolt 40 is located in the internal space of the anchor pipe 20. As shown in FIGS. 1 and 3, the upper end of the anchor bolt 40 protrudes upward from the fastening nut 30 and is exposed to the outside. Since the male screw portion 41 is formed over the entire length of the anchor bolt 40, the anchor bolt 40 is attached to the anchor pipe 20 according to the position where the male screw portion 41 and the female screw portion 33 of the fastening nut 30 are engaged with each other. Positioned at different longitudinal positions. Thereby, the anchor unit 10 can expand and contract in the longitudinal direction.

  Each dimension of the anchor bolt 40 is determined so as to correspond to the anchor pipe 20. The outer diameter of the anchor bolt 40 is smaller than the inner diameter of the anchor pipe 20, and is about 12 mm to 17 mm as an example. Thereby, the anchor bolt 40 is movable in the longitudinal direction in the internal space of the anchor pipe 20. The total length of the anchor bolt 40 is longer than the total length of the anchor pipe 20, and is about 300 mm to 500 mm as an example. Thereby, the upper end of the anchor bolt 40 is always positioned above the fastening nut 30.

  A concave groove 42 is formed on the upper end surface of the anchor bolt 40. The concave groove 42 is used for fixing the anchor bolt 40 to the base 51 (FIG. 7A) in a non-rotatable state. Details will be described later.

[Construction of foundation concrete 50 and foundation 51]
Hereinafter, a method for constructing the foundation concrete 50 and the foundation 51 on the ground using the anchor unit 10 described above will be described. The anchor unit 10 is incorporated into the foundation structure of the building by a method described below.

  First, as a preparation, a resin or metal O-ring 58 (FIGS. 4 to 6) is attached to the anchor unit 10. Therefore, the worker releases the fastening nut 30 from the anchor pipe 20 and pulls out the anchor bolt 40 from the anchor pipe 20. The operator inserts the anchor bolt 40 through the O-ring 58 and fastens the fastening nut 30 to the anchor pipe 20 through the O-ring 58. As a result, the O-ring 58 is sandwiched between the upper end surface of the anchor pipe 20 and the rectangular column portion 32 of the fastening nut 30 while surrounding the outer periphery of the fastening nut 30 (state of FIG. 6). The O-ring 58 forms a recessed portion 59 (FIG. 7A) in the foundation concrete 50 and prevents the foundation concrete 50 from covering the periphery of the prismatic portion 32.

  As shown in FIG. 4, the skeleton 52 is constructed on the ground 48 (FIG. 4B) having appropriate support strength. The framework 52 is an assembly of vertical bars 53 and horizontal bars 54 made of a metal material such as steel. The vertical bars 53 and the horizontal bars 54 are connected to each other by welding or wire winding. As shown in FIG. 4B, a plurality of lateral streaks 54 are stretched in a mesh shape along the first direction 8 and the second direction 9 about several tens of centimeters above the ground 48. From there, a plurality of vertical bars 53 protrude upward. The periphery of the lower end of the vertical line 53 is coupled to the horizontal line 54. As shown in FIG. 4A, the plurality of vertical bars 53 are arranged along the first direction 8 and are connected to each other by horizontal bars 54 at a predetermined height. In FIG. 4B, the skeleton 52 is depicted as floating from the ground 48, but in reality, a spacer block (not shown) arranged at a predetermined position on the ground 48 is skeleton. 52 is supported. The framework 52 is for increasing the strength of the foundation concrete 50 placed on the ground 48.

  The foundation concrete 50 described below is a cloth foundation or a solid foundation, and the foundation rising thickness is preferably 120 mm or more. However, FIG. 4 shows an example of a fabric foundation. In the following, an example in which the foundation concrete 50 is placed in two stages of a base part and a rising part will be described, but this is only an example. That is, the base portion and the rising portion may be placed simultaneously.

  First, concrete is poured into a formwork (not shown) installed on the ground 48 and solidified. Thereby, the base concrete 49 (FIG. 4B), which is the base portion of the foundation concrete 50, is constructed. Of the framework 52, the mesh portion described above is buried in the base concrete 49, and the vertical bars 53 protrude upward from the base concrete 49.

  After the base concrete 49 is constructed, the anchor pipe 20 is attached to the horizontal bar 54 via the metal fitting 55 (an example of the second metal fitting of the present invention) according to the procedure described below (FIG. 4A). State). In this state, the anchor bolt 40 is suspended by the metal fitting 95 (the state shown in FIG. 4B). In FIG. 4A, the base concrete 49, the mold 93, and the metal fitting 95 are omitted.

  On the base concrete 49, on both sides of the vertical bars 53, a form frame 93 (FIG. 4B) into which concrete at the rising portion is poured is installed. The metal fitting 95 is bridged and supported by the molds 93 on both sides. In the meantime, the anchor bolt 40 is attached. The metal fitting 95 is provided with a structure for sandwiching and fixing the anchor bolt 40. For example, the metal fitting 95 may have a clip shape divided into two. Since the anchor pipe 20 is attached to the horizontal bar 54 via the metal fitting 55, the anchor unit 10 is prevented from swinging in a state where it is suspended from the metal fitting 95. The position of the anchor unit 10 is determined by correspondence with the position of a bolt hole 62 of the base 51 to be described later. Note that the metal fitting 95 is not necessarily used to suspend the anchor unit 10, and any method may be used.

  The metal fitting 55 shown in FIG. 5 (A) is manufactured by processing a metal plate. The metal fitting 55 has a hook 56 that is hooked on the lateral stripe 54 on one end side. The metal fitting 55 is penetrated in the thickness direction by a rectangular insertion hole 57 (an example of the hole of the present invention). The length L1 of the long side of the insertion hole 57 in the metal fitting 55 is longer than the length L2 of the long side of the blocking plate 21, and the length L3 of the short side of the insertion hole 57 is the length of the short side of the blocking plate 21. Longer than L4. For this reason, the anchor unit 10 can be inserted into the insertion hole 57 from the lower end side in the state of FIG. 5A in which the long side and the short side are directed in the same direction. Further, the length L3 of the short side of the insertion hole 57 is shorter than the length L2 of the long side of the closing plate 21. Therefore, in the state of FIG. 5B in which the anchor unit 10 is inserted into the insertion hole 57 and then rotated by 90 °, the closing plate 21 is engaged with the periphery of the insertion hole 57. In this state, the anchor unit 10 does not come out of the insertion hole 57 simply by pulling the anchor unit 10 upward with respect to the metal fitting 55. Further, as shown in FIG. 5B, the wobbling of the anchor unit 10 inside the insertion hole 57 can be reduced by bending the side opposite to the hook 56 in the metal fitting 55 upward.

  After the anchor unit 10 is installed, concrete is poured into the mold 93. At this time, the vertical bars 53 and the horizontal bars 54 are completely buried in the concrete, and the anchor unit 10 is buried in the concrete below the upper end of the O-ring 58. The concrete is solidified and integrated with the base concrete 49, whereby the foundation concrete 50 is constructed on the ground. The mold 93 and the metal fitting 95 are removed (state shown in FIG. 6). 6 to 8 and 11, the frame 52 and the metal fitting 55 are omitted. Up to here is an example of the foundation concrete placing process of the present invention.

  The O-ring 58 is removed from the foundation concrete 50 and the anchor unit 10. In the foundation concrete 50, a recessed portion 59 (FIG. 7) is located at a position where the O-ring 58 is removed. Is formed. The recessed portion 59 secures a space around which the fastening nut 30 rotates.

  Moreover, the anchor bolt 40 protruded from the foundation concrete 50 is rotated, and the length by which the anchor bolt 40 protrudes is adjusted. This length is determined according to the thickness of the foundation 51 installed on the foundation concrete 50.

  As shown in FIG. 7, a plurality of foundation packings 60 (an example of the packing according to the present invention) are placed on the foundation concrete 50 at a predetermined interval. The base packing 60 has a plate shape with a thickness of about 20 mm. A foundation 51 of the building is installed on the foundation concrete 50 via the foundation packing 60. The base 51 is processed wood. At a position where the foundation packing 60 is not provided, a gap 61 corresponding to the thickness of the foundation packing 60 is interposed between the base 51 and the foundation concrete 50.

  A bolt hole 62 through which the anchor bolt 40 is inserted is opened at a position corresponding to the anchor unit 10 in the base 51. A recess 63 is formed around the bolt hole 62 and on the lower surface side of the base 51. The concave portion 63 secures a space for the fastening nut 30 to move upward when the fastening nut 30 is released.

  The upper end of the anchor bolt 40 penetrates the base 51 upward. A nut 91 corresponding to the male thread portion 41 of the anchor bolt 40 is attached from the upper end of the anchor bolt 40 via a washer 92. Thereby, the anchor bolt 40 and the base 51 are fastened. Note that the above is an example of the foundation installation process of the present invention.

  A metal fitting 64 (an example of the first metal fitting of the present invention) is attached to the upper surface of the base 51 and the upper end of the anchor bolt 40. The metal fitting 64 shown in FIG. 7B is manufactured by processing a metal plate. The metal fitting 64 is bent so that the central portion 65 protrudes upward. Screw holes 66 are opened at both ends with respect to the central portion 65, and projecting pieces 67 (an example of the protrusion of the present invention) protrude downward from the central portion 65. As shown in FIG. 7A, the metal fitting 64 is attached to the upper surface of the base 51 by screws 68 or the like inserted into the screw holes 66. At that time, the central portion 65 is positioned at a position corresponding to the anchor bolt 40. The metal fitting 64 is fixed in a state where the projecting piece 67 is inserted into the concave groove 42 on the upper end surface of the anchor bolt 40 (the state shown in FIG. 7A). Note that the above is an example of the metal fitting attaching process of the present invention. In addition, each procedure mentioned above is each implemented for each anchor unit 10 buried in the foundation concrete 50.

[Procedure for leveling work]
When the uneven settlement of the building occurs, both the foundation concrete 50 and the foundation 51 are lowered. Since the descending depth varies depending on the position, the base 51 is inclined with respect to the horizontal plane. At this time, the foundation 51 is returned to the horizontal state by the leveling work described below.

  First, the worker releases the fastening nut 30 from the anchor pipe 20 for each anchor unit 10. For this purpose, a tool such as a spanner is inserted into the gap 61 and a torque in a direction for releasing the fastening is applied to the prism portion 32. Here, the intervals between the screw threads of the male screw portions 31 and 41 and the female screw portions 23 and 33 (FIGS. 2 and 3 respectively) are formed to be equal. Therefore, the operator can rotate the fastening nut 30 with respect to both in the state which maintained the relative positional relationship of the anchor pipe 20 and the anchor bolt 40. FIG. As a result, the fastening nut 30 moves upward along the anchor bolt 40, and the fastening of the fastening nut 30 to the anchor pipe 20 is released (the state shown in FIG. 8A). Note that the above is an example of the fastening release process of the present invention.

  Subsequently, the operator lifts the base 51 from the foundation concrete 50 using the jack mechanism 94 (FIG. 9) (hereinafter referred to as jack-up). The jack mechanism 94 shown in FIG. 9 raises the support plate from the base plate 97 by a hydraulic jack 96. One end side (the right side in FIG. 9) of the pressure bearing plate 98 is connected to the base 97 by a turnbuckle 99 whose length in the vertical direction can be adjusted. The other end side (left side in FIG. 9) of the pressure bearing plate protrudes in the horizontal direction. Jacks 96 are arranged between both ends of the pressure plate.

  The operator installs the jack mechanism 94 in the state shown in FIG. That is, the jack mechanism 94 is disposed along the side surface of the foundation concrete 50, and the other end side of the bearing plate protruding in the horizontal direction is inserted into the gap 61. The support plate 98 is lifted by the jack 96 by moving the handle 100 of the jack 96 up and down. The operator rotates the barrel 99c of the turnbuckle 99 in parallel with this operation. Thereby, all the screw bolts 99a and 99b are spaced apart from each other, and the turnbuckle 99 is extended. Thus, the bearing plate 98 can be lifted horizontally. An operator arranges the jack mechanisms 94 around the anchor units 10 and lifts the base 51. At this stage, the base 51 does not need to be strictly level.

  Since the fastening nut 30 is not fastened to the anchor pipe 20, the anchor bolt 40 is movable in the longitudinal direction with respect to the anchor pipe 40. For this reason, at the time of jack-up, the anchor bolt 40 and the anchor pipe 20 move upward together with the base 51 (the state of FIG. 8B).

  After jack-up by each jack mechanism 94 is completed, a support member (not shown) corresponding to the distance between the base 51 and the foundation concrete 50 after jack-up is inserted into the gap 61. After insertion of the support member, the base packing 60 is removed.

  After the above steps, a plurality of jack mechanisms 94 are installed below the foundation 51 to support the foundation 51. The operator operates each jack mechanism 94 again to finely adjust the inclination of the base 51. Thus, the base 51 returns to the horizontal state. Note that the above is an example of the lifting process of the present invention.

  The operator rotates the fastening nut 30 in the fastening direction. Thereby, the fastening nut 30 descends along the anchor bolt 40. When the lower end of the fastening nut 30 reaches the enlarged diameter portion 22. The male screw part 31 and the female screw part 23 (FIGS. 2 and 3 respectively) mesh with each other. Furthermore, when the fastening nut 30 is rotated, the fastening nut 30 is fastened to the anchor pipe 20 (state shown in FIG. 8C). Note that the above is an example of the re-fastening process of the present invention.

  A cap 69 is put on to cover the prism portion 32 (state shown in FIG. 8D). The cap 69 is mainly formed of an elastic material such as rubber. The cap 69 is fitted from the side surface of the anchor bolt 40. Therefore, a slit for allowing the anchor bolt 40 to pass is formed in the cap 69.

  Subsequently, the operator places the base packing 60 in the original position again. The width of the gap 61 is larger than the thickness of the foundation packing 60 by jacking up. For this reason, as shown in FIG. 10, a predetermined number of metal or resin floor plates 70 are laid under the base packing 60. At a position where the width of the gap 61 is particularly wide, the metal fitting 71 is disposed under the foundation packing 60. The metal fitting 71 is obtained by connecting an upper plate 72 and a lower plate 73 by a column 74. The space between the upper plate 72 and the lower plate 73 can be adjusted by extending and contracting the support column 74. The metal fitting 71 is arranged at each position in a state where the distance between the upper plate 72 and the lower plate 73 is adapted to the width of the gap 61. Moreover, the rebar 75 is attached along a horizontal direction so that each anchor bolt 40 may be connected.

  Finally, the mold 93 (FIG. 4B) is attached to the inside and outside (the front side and the back side in FIG. 10) of the foundation concrete 50 so as to cover the gap 61. Then, the mortar is poured into the mold 93 by the mortar pump. The mortar is poured until the distance between the mortar and the foundation 51 becomes the same as the distance between the foundation concrete 50 and the foundation 51 before the uneven settlement. As the mortar solidifies, the foundation concrete 50 is added upward by the mortar. At this time, a part of the anchor unit 10 is buried in the mortar.

[Effects of Embodiment]
According to the present embodiment, by releasing the fastening of the fastening nut 30 with respect to the anchor pipe 20, the anchor bolt 40 can move in the longitudinal direction with respect to the anchor pipe 20. Therefore, the leveling work can be easily performed by the method described above without cutting the anchor bolt 40. Moreover, since each member is connected by the engagement of the screws, sufficient tensile strength can be ensured.

  Further, since the intervals between the screw threads of the male screw portions 31 and 41 and the female screw portions 23 and 33 are all equal, the relative positional relationship between the anchor pipe 20 and the anchor bolt 40 is maintained with respect to both. Thus, the fastening nut 30 can be rotated. That is, even when the anchor pipe 20 and the anchor bolt 40 are fixed to the foundation concrete 50 and the foundation 51, respectively, the fastening of the fastening nut 30 can be easily released without moving the foundation 51.

  Further, the protrusion 67 of the metal fitting 64 is inserted into the concave groove 42 formed on the upper end surface of the anchor bolt 40, so that the rotation of the anchor bolt 40 with respect to the base 51 is stopped. Thereby, when the fastening nut 30 is moved along the longitudinal direction of the anchor bolt 40, the anchor bolt 40 is prevented from rotating integrally with the fastening nut 30.

  Further, when the foundation concrete 50 is placed, the anchor bolt 40 is suspended from the metal fitting 95 and positioned at a position corresponding to the bolt hole 62 of the base 51. In this state, the anchor pipe 20 is attached to the horizontal bar 54 via the metal fitting 64, and the horizontal swing of the anchor unit 10 is stopped. Thereby, the anchor unit 10 is maintained in a state in which the longitudinal direction coincides with the vertical direction without being swung by the poured concrete.

  Further, the supporting strength of the anchor pipe 20 by the foundation concrete 50 is improved by the closing plate 21. Further, when the anchor pipe 20 is attached to the horizontal bar 54 via the metal fitting 55, the closing plate 21 is engaged with the peripheral edge of the insertion hole 57 of the metal fitting 55, so that the anchor unit 10 may be detached from the metal fitting 55. Is reduced.

  Moreover, since the prismatic part 32 is formed in the fastening nut 30, the fastening nut 30 is fastened or released from the anchor pipe 20 using a tool such as a spanner.

  Further, since the gap 61 is formed between the foundation concrete 50 and the foundation 51 by the foundation packing 60, it is easy to rotate the fastening nut 30 with a tool such as a spanner.

  Moreover, since the recessed part 59 is formed in the foundation concrete 50 by the O-ring 58 attached to the anchor unit 10, the foundation concrete 50 covers the periphery of the prismatic part 32, and the rotation of the fastening nut 30 is inhibited. Can be prevented.

  Further, since the cap 69 is put on the prism portion 32 in the leveling work, the poured mortar is prevented from solidifying around the prism portion 32. That is, when the leveling work is performed again, the fastening mortar 30 can be rotated again by destroying the mortar around the cap 69 and removing the cap 69 from the prism portion 32.

  Further, in the leveling work, the height to be jacked up varies depending on the position of the base 51, so that the anchor bolt 40 may be inclined with respect to the anchor pipe 20. As described above, in the present embodiment, the female screw portion 31 and the female screw portion 23 have a gentle taper shape. For this reason, even if the anchor bolt 40 is inclined with respect to the anchor pipe 20 after jacking up, the fastening nut 30 can be fastened to the anchor pipe 20 as long as the inclination angle is small.

[Modification]
As FIG. 11 shows, the anchor bolt 40 may be fixed to the core 80 (foundation core or column core) according to the position installed. A metal fitting 81 is attached to the side surface of the core 80 with a bolt or the like. The anchor bolt 40 is inserted into the insertion hole 82 of the metal fitting 81. At this time, the upper end of the anchor bolt 40 is positioned above the metal fitting 81. A nut 91 is attached from the upper end of the anchor bolt 40 via a washer 92. Thereby, the anchor bolt 40 and the metal fitting 81 are fastened.

  A metal fitting 83 (an example of the first metal fitting of the present invention) is attached to the core 80. As shown in FIG. 11 (B), the metal fitting 83 is a metal plate bent in a step shape. As shown in FIG. 11A, the metal fitting 83 is attached to the side surface of the core 80 by a screw 85 or the like inserted into the screw hole 84. At that time, the protrusion 86 (an example of the protrusion of the present invention) formed at the end opposite to the screw hole 84 is inserted into the concave groove 42 formed in the upper end surface of the anchor bolt 40. 83 is fixed. Also by such a method, the rotation of the anchor bolt 40 with respect to the base 51 is prevented as in the above-described embodiment.

  Moreover, in embodiment mentioned above, the detailed shape of the anchor unit 10 is suitably changed by those skilled in the art. For example, the fastening nut 30 does not necessarily have to have the prism portion 32. Instead, a hole is formed in the side surface of the fastening nut 30, and the fastening nut 30 may be rotated by a dedicated tool inserted into the hole. Moreover, if the shape of each metal fitting 55,64,71,81,83,95 is also a range which has the effect mentioned above, the detailed shape may be changed suitably.

  In the above-described embodiment, the foundation packing 60 is disposed to form the gap 61 between the foundation concrete 50 and the foundation 51. However, it is possible to secure a space for rotating the fastening nut 30. For example, the basic packing 60 is not necessarily essential. For example, a space may be formed around the fastening nut 30 by processing a part of the base 51 into a notch shape.

  In the embodiment described above, the male screw portion 41 is formed over the entire length of the anchor bolt 40 in the longitudinal direction. However, the male screw portion 41 is formed only in a part of the anchor bolt 40 in the longitudinal direction. Just do it. That is, the male screw portion 41 only needs to be formed in a range where it is necessary to engage with the upper end portion to which the nut 91 is fastened and the female screw portion 33 of the fastening nut 30. The range in which the engagement with the female thread portion 33 of the fastening nut 30 is determined in accordance with the range in which the anchor bolt 40 can slide with respect to the anchor pipe 20.

  In the above-described embodiment, the foundation concrete 50 has been described by taking the cloth foundation as an example. However, the foundation concrete 50 is not limited to the cloth foundation. For example, the foundation concrete 50 may be a solid foundation.

10 ... Anchor unit 20 ... Anchor pipe 21 ... Blocking plate (flat plate)
23 ... Female thread (first thread)
30 ... Fastening nut (fastening member)
31 ... male screw part (second screw part)
33 ... Female thread (third thread)
40 ... anchor bolt 41 ... male thread (fourth thread)
42 ... concave groove 50 ... foundation concrete 51 ... base 52 ... framework 55 ... metal fitting (second metal fitting)
56 ... hook 57 ... insertion hole (hole)
59 ... Recess 60 ... Basic packing (packing)
64 ... metal fitting (first metal fitting)
67 ... Projection (projection)
83 ... metal fitting (first metal fitting)
86 ... Projection (projection)
96 ... Jack

Claims (12)

An anchor pipe having a first threaded portion that is open at least at the upper end and is formed along the inner periphery of the upper end;
The first screw has a second screw portion formed along the outer periphery of the lower end portion and meshed with the first screw portion, and a third screw portion formed along the inner periphery. An annular fastening member fastened to the upper end portion of the anchor pipe by meshing the portion with the second screw portion;
A fourth screw portion is formed along the outer periphery and meshes with the third screw portion, and the third screw portion and the fourth screw portion are meshed so that the lower end portion is the anchor. An anchor unit comprising an anchor bolt inserted into the internal space of the pipe.   2. The anchor unit according to claim 1, wherein the screw threads of the first screw portion, the second screw portion, the third screw portion, and the fourth screw portion are equal to each other.   The anchor unit according to claim 1, wherein the anchor bolt has a concave groove on an upper end surface.   The anchor unit according to any one of claims 1 to 3, wherein the anchor pipe is provided with a flat plate having a rectangular shape in a plan view and projecting laterally from the lower end.   The anchor unit according to any one of claims 1 to 4, wherein an upper end portion of the fastening member is located above an upper end of the anchor pipe and an outer periphery thereof is a polygonal shape. A construction method for constructing a foundation and foundation of a building by the anchor unit according to claim 1,
A foundation concrete placing step of placing foundation concrete around the anchor unit supported with the longitudinal direction of the anchor bolt as a vertical direction, and burying the anchor pipe in the foundation concrete;
A foundation is installed on the solidified foundation concrete and the anchor bolt protruding from the foundation concrete penetrates the foundation of the building and the anchor bolt and the building foundation are fastened. Construction method of foundation and foundation including process.   The foundation and foundation construction method according to claim 6, wherein in the foundation installation step, a packing for exposing an upper end portion of the fastening member is interposed between the foundation concrete and the foundation.   The foundation and foundation construction method according to claim 6 or 7, wherein in the foundation concrete placing step, a recessed portion having a space in which the fastening member can rotate is formed on an upper surface of the foundation concrete. A metal fitting attaching step of attaching the first metal fitting having a protrusion to the anchor bolt and the base of the building;
The foundation according to any one of claims 6 to 8, wherein the first metal fitting is fixed to a base of the building in a state where the protrusion is inserted into a concave groove formed on an upper end surface of the anchor bolt. Foundation construction method.   In the foundation concrete placing step, the anchor unit is attached to the framework via a second metal fitting having a hook hooked to the framework of the foundation concrete and a hole through which the anchor pipe is inserted. The foundation and foundation construction method according to any one of Items 6 to 9.   A foundation and foundation of a building constructed by the foundation and foundation construction method according to claim 6. A fastening release step for releasing the fastening of the fastening member to the anchor pipe;
In the state where the fastening of the fastening member is released, a lifting step of lifting the foundation of the building from the foundation concrete with a jack and sliding the anchor bolt with respect to the anchor pipe;
A leveling method applied to the foundation and foundation of the building according to claim 11, further comprising a re-fastening step of fastening the fastening member to the upper end of the anchor pipe in a state where the foundation of the building is lifted by a jack. .

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