JP5797021B2 - Sheath tube for concrete member and method for producing concrete member embedded with the same - Google Patents

Description

  The present invention relates to a sheath tube for a concrete member and a method for producing a concrete member in which the sheath tube is embedded.

  Conventionally, for example, methods shown in FIGS. 10 and 11 are known as methods for forming holes such as handrail support holes and anchor bolt embedding holes in concrete members.

  In this conventional method, a support frame 102 is installed between upper side frames of a concrete mold 101, and an attachment member 104 having a sheath pipe attachment piece 103 in the horizontal direction is attached to the support frame 102. A sheath tube 105 having an upper end opened at the lower surface and a lid 106 fixed to the lower end is vertically disposed, and the bolt 107 is inserted into the sheath tube 105 through a bolt insertion hole 108 formed in the sheath tube attachment piece 103. The male screw 109 at the tip of the bolt 107 is screwed onto the female screw 110 formed on the lid body 106 to hold the sheath tube 105, and then the concrete is cast into the concrete mold 101. After the concrete is hardened, the bolt 107, the support frame 102, the sheath tube mounting piece 103, and the mounting member 104 are removed from the concrete mold 101, and the sheath 105 in a state embedded in the concrete member, and the hollow portion 111 of the sheath tube 105 and handrail post holes and anchor bolts embedded holes like.

  Further, as shown in FIGS. 10 and 11, the lid 106 is a flat plate in which the entire inner side surface 112 is formed by a surface orthogonal to the axial center XX of the cylindrical body 113 constituting the sheath tube 105. It is formed in the shape.

  In the sheath tube 105 in which the lid 106 is fixed as described above, the operator places the sheath tube 105 vertically on the lower surface of the sheath tube mounting piece 103 with one hand, and the bolt 107 with the other hand. Is inserted into the cylindrical body 113 through the bolt insertion hole 108 and the male screw 109 of the bolt 107 is screwed to the female screw 110 of the lid body 106, the upper end opening of the cylindrical body 113 is the sheath tube mounting piece 103. Therefore, the operator cannot visually check the alignment between the male screw 109 of the bolt 107 and the female screw 110 of the lid body 106. For this reason, the bolt 107 and the cylindrical body 113 have to be moved relative to each other in the radial direction to align them, and the attaching operation of the sheath tube 105 is troublesome.

  Therefore, the present invention facilitates the alignment of the male screw at the tip of the bolt and the female screw formed on the lid, and embeds the sheath tube for a concrete member that facilitates the installation work of the sheath tube. It aims at providing the manufacturing method of a concrete member.

In order to solve the above-mentioned problem, the invention according to claim 1 is a cylindrical body having a hollow portion that is open at both ends, and a lid body that is fixed to one end of the cylindrical body and has a female screw at the center thereof. And consist of
The other end side opening of the cylindrical body is closed with a mounting member having a bolt insertion hole, and a bolt with a male screw engraved at the tip is inserted into the cylindrical body from the bolt insertion hole, and the bolt A sheath tube that is detachably disposed with respect to the concrete form by screwing the male screw with the female screw of the lid,
The inner side surface of the lid body is increased in diameter toward the other end side opening of the cylindrical body over the entire length from the outer edge of the female screw to the outer peripheral portion of the lid body, and the distal end on the insertion side of the bolt is A sheath tube for a concrete member, characterized in that it is formed on a guide surface that guides to the female screw.

The invention according to claim 2 is a sheath tube having a cylindrical body having a hollow portion open at both ends, and a lid body fixed to one end of the cylindrical body and having a female screw at the center thereof,
A mounting member for detachably arranging the sheath tube with respect to the concrete formwork,
The mounting member has a bolt insertion hole, and a sheath tube positioning member protruding inward from the periphery of the bolt insertion hole in the concrete formwork,
After engaging the other end of the cylindrical body with the positioning member of the sheath tube and closing the other end side opening of the cylindrical body with an attachment member,
A bolt with a male screw engraved at the tip is inserted into the cylindrical body through the bolt insertion hole, the male screw of the bolt is screwed into the female screw of the lid, and the sheath tube is connected to the concrete formwork. After detachably placing against
A concrete member manufacturing method in which concrete is placed in the concrete formwork, and a sheath tube is embedded so that the opening on the other end side opens on the surface of the concrete member,
The inner side surface of the lid body is increased in diameter toward the other end side opening of the cylindrical body over the entire length from the outer edge of the female screw to the outer peripheral portion of the lid body, and the distal end on the insertion side of the bolt is A method for manufacturing a concrete member, characterized in that the concrete member is formed on a guide surface that is guided by the female screw.

According to the present invention, the inner surface of the lid, said to extend from the outer edge of the female thread the entire length up to the outer peripheral portion of the lid, by diameter as toward the other end opening of the tubular body, the By forming the front end of the bolt on the guide surface guided to the female screw, when the bolt is inserted into the cylindrical body, the front end of the bolt comes into contact with the guide surface of the lid. It slides on the guide surface and is guided to the female screw. Therefore, the alignment operation of the male screw of the bolt and the female screw of the lid can be easily performed, and the sheath tube can be easily attached.

The longitudinal cross-sectional view which shows Example 1 of this invention and shows the installation state of the sheath pipe | tube to a concrete formwork. The AA sectional view taken on the line of the sheath pipe | tube in FIG. The expanded sectional view of the lid used for Example 1 of the present invention. The perspective view which shows the attachment member, sheath tube, and volt | bolt of FIG. The side cross section of the concrete member of the state which formed the hole in the concrete member using the sheath pipe | tube of FIG. The sectional side view of the lid used for Example 2 of the present invention. Side sectional drawing of the cover body used for Example 3 of this invention. Side sectional drawing of the cover body used for Example 4 of this invention. Side sectional drawing of the cover body used for Example 5 of this invention. The sectional side view which shows the conventional sheath tube and its attachment state. FIG. 11 is a side sectional view showing a lid body of the sheath tube of FIG. 10.

[Example 1]
1 to 5 show a first embodiment of the present invention. In addition, a present Example is an Example at the time of placing concrete by arrange | positioning a sheath pipe | tube vertically by a flat type.

  FIG. 1 is a longitudinal sectional view showing the installation state of the sheath tube 7 on the concrete mold 1, and the concrete mold 1 is composed of a bed 2 and a side mold 3 standing on the periphery thereof.

  The support frame 4 is detachably mounted between the upper ends of the opposing side molds 3 and 3, and the position corresponding to the position of a hole (handrail post hole, anchor bolt hole, etc.) formed in the concrete member to be molded is A mounting member 5 is detachably provided on the support frame 4.

As shown in FIGS. 1 and 4 , the attachment member 5 includes an attachment piece 5 a that stands up and attaches to the support frame 4, and a sheath tube attachment piece 5 b that is provided in the horizontal direction and attaches the sheath tube 7. The cross section is formed in an L shape. The height position of the lower surface 5c of the sheath tube attachment piece 5b is substantially flush with the concrete surface placed in the concrete mold 1 with the attachment member 5 attached to the support frame 4. The lower surface 5c is formed in such an area that the whole other end side opening 8a of the tubular body 8 in the sheath tube 7 to be described later can be closed. A bolt insertion hole 5d concentric with the axis XX is formed in the central portion of the sheath tube attachment piece 5b, that is, a portion located on the axis XX line of the sheath tube 7 installed as described later. Is formed. For example, as shown in FIG. 4, the attachment member 5 is attached to the support frame 4 by forming a notch 5e in the attachment piece 5a and removably fitting the notch 5e to the support frame 4. .

  An annular positioning member 6 that fits into the opening 8a on the other end side of the sheath tube 7 is fixed to the lower surface 5c of the sheath tube attachment piece 5b so as to protrude downward. The outer shape of the positioning member 6 is formed along the inner surface of the other end side opening 8a of the sheath tube 7, and the outer diameter of the positioning member 6 is set slightly smaller than the inner diameter of the other end side opening 8a. The positioning member 6 is set so as to be detachable from the other end side opening 8a of the sheath tube 7 and to be fitted almost fully. The positioning member 6 only needs to be able to engage and position the other end portion of the sheath tube 7. In addition to the annular shape, a plurality of partially protruding projections can be appropriately spaced. May be provided in an annular shape.

Next, the sheath tube 7 will be described.
The sheath tube 7 includes a cylindrical body 8 having a desired diameter and length corresponding to the diameter and length of a hole 30 (see FIG. 5) formed in the concrete member, and a lid body 9.

  As shown in FIGS. 1 to 5, the cylindrical body 8 has a circular cross-sectional shape orthogonal to the axis XX, a hollow portion 8 b inside, and open at both ends. The other end side opening 8a is provided at the surface side end (the other end) of the concrete member, and the one end side opening 8c is provided at the inner side end (one end) of the concrete member. The cylindrical body 8 is formed of, for example, a metal spiral sheath tube.

  A lid body 9 having an outer diameter equal to the outer diameter of the one end side opening 8c of the cylindrical body 8 is formed in the one end side opening 8c of the cylindrical body 8, and an outer peripheral portion 9a thereof is formed on the cylindrical body 8. It is fixed to the outer peripheral surface of the one end side opening 8c by welding W or the like.

  The lid body 9 is formed with a female screw forming portion 9b concentrically with the central portion thereof, that is, the axis XX of the cylindrical body 8, and a female screw 9c is formed in the female screw forming portion 9b. It is formed so as to penetrate in the vertical direction in the figure. The inner surface of the main body portion 9d between the outer peripheral portion 9a and the female screw forming portion 9b in the lid 9 is a guide surface 9e whose diameter increases from the outer edge of the female screw 9c toward the other end side opening 8a of the cylindrical body 8. Is formed. In the first embodiment, the guide surface 9e is formed in an inverted spindle shape formed by an arc having a center on the lower side of the lid body 9 and on the outer side in the left-right direction. The guide surface 9e is formed over the entire outer circumference (full length) of the outer peripheral portion 9a and the female screw 9c. Further, the lid body 9 is formed of a metal plate, and after forming the shape by press working, a female screw 9c is engraved in the female screw forming portion 9b.

  The cylindrical body 8 is arranged in the concrete mold 1 with the other end side opening 8a fitted to the outer periphery of the positioning member 6, and the bolt 10 having the polygonal head 10a is provided. A male screw 10b, which is inserted into the bolt insertion hole 5d from above and engraved at the tip of the bolt 10, is screwed into the female screw 9c of the lid body 9 to form a sheath made up of the tubular body 8 and the lid body 9. The tube 7 is supported in a cantilevered manner while being suspended from the sheath tube mounting piece 5 b of the mounting member 5.

The cylindrical body 8 and the lid body 9 may be integrally formed.
Next, installation work of the sheath tube 7 and concrete placement will be described.

  First, the supporting frame 4 is constructed at a predetermined position between the upper ends of the opposing side molds 3 and 3 before placing concrete.

  Next, the attachment member 5 is attached to the support frame 4 with the sheath tube attachment piece 5b in a horizontal posture at a predetermined position.

  Next, the operator places the sheath tube 7 in the concrete mold 1 with one hand, and the other end side opening end portion 8a of the cylindrical body 8 is positioned on the outer periphery of the positioning member 6 of the mounting member 5. It fits into a part and makes it a vertical attitude | position as shown in FIG.

  Next, with the other hand, the bolt 10 is inserted into the cylindrical body 8 through the bolt insertion hole 5d of the mounting member 5 from the male screw 10b side. At the time of insertion, if the tip of the bolt 10 on the male screw 10 b side is displaced laterally from the axis XX of the cylindrical body 8, the tip of the bolt 10 contacts the guide surface 9 e of the lid 9. Then, it slides on the guide surface 9e and is guided and guided to the female screw 9c formed at the center of the lid body 9. The axial center of the bolt 10 and the axial center of the cylindrical body 8 are aligned.

  When the head 10a of the bolt 10 is tightened and rotated in this state, the male screw 10b of the bolt 10 is screwed into the female screw 9c, the sheath tube 7 is pushed up, and the upper end thereof is the sheath tube mounting piece of the mounting member 5. 5b is contacted.

  Thereby, the sheath tube 7 is positioned with respect to the horizontal direction by the positioning member 6, and the vertical posture is maintained by the sheath tube mounting piece 5 b and the bolt 10.

Then, concrete is placed in the concrete mold 1 in the state shown in FIG.
Then, the concrete is cured, and the bolt 10 is loosened in a state where the concrete does not float even if the mounting member 5 with the positioning member 6 is removed and the sheath tube 7 is hard enough to be pressed. The mounting member 5 with the positioning member 6 and the support frame 4 are removed upward to rotate the peripheral iron.

  Thereby, as shown in FIG. 5, the tubular body 8 and the lid body 9 are cured in a state where the opening 8 a on the other end side of the tubular body 8 is opened at substantially the same position as the surface of the cured concrete member 40. It remains in the concrete member 40 and is buried. The hollow portion 8b of the embedded sheath tube 7 forms a hole 30 such as a handrail support hole or an anchor bolt insertion hole that opens on the concrete surface side.

  In addition, although the said Example is an example applied to the precast concrete member (PCa member), apply this example also when forming an anchor-bolt embedding hole in a spot cast concrete member, for example, a spot cast foundation. Can do.

Further, the sheath tube 7 may be arranged in a horizontal direction and used for a striking concrete formwork.
[Example 2]
FIG. 6 shows a second embodiment.

  The second embodiment is a modification of the guide surface 9e of the lid body 9. The main body portion 9d of the lid body 9, that is, the guide surface 9e is on the cylindrical body 8 side and the axial center of the cylindrical body 8 is used. It is formed by a downwardly curved arc having a center on the line XX, and the inner surface between the outer peripheral portion 9a of the lid 9 and the outer edge of the female screw 9c is connected to the other end of the cylindrical body 8 from the outer edge of the female screw 9c. It is formed so as to have a curved surface whose diameter increases toward the side opening 8a. That is, the guide surface 9e is formed in a bowl shape formed of a curved surface, the lid body 9 is formed in a funnel shape, and the guide surface 9e is formed over the entire outer edge (the entire length) of the outer peripheral portion 9a and the female screw 9c. Is.

Other structures and installation work of the sheath tube 7 are the same as those in the first embodiment.
Also in the second embodiment, the same operations and effects as the first embodiment are achieved.
[Example 3]
FIG. 7 shows a third embodiment.

  The third embodiment is a modification of the guide surface 9e of the lid body 9. The body portion 9d of the lid body 9, that is, the guide surface 9e is opened from the outer edge of the female screw 9c to the other end side opening portion of the cylindrical body 8. It is formed on a tapered inclined surface whose diameter increases toward 8a. That is, the guide surface 9e is formed in an inverted conical shape over the entire outer periphery (full length) of the outer peripheral portion 9a and the female screw 9c, and the lid body 9 is formed in a funnel shape.

Other structures and installation work of the sheath tube 7 are the same as those in the first embodiment.
Also in the third embodiment, the same operations and effects as the first embodiment are achieved.
[Example 4]
FIG. 8 shows a fourth embodiment.

  The fourth embodiment is a modification of the guide surface 9e of the lid body 9 and is a flat plate portion 9f orthogonal to the axis XX of the cylindrical body 8 from the outer peripheral portion 9a of the lid body 9 toward the inside. And a curved surface that increases in diameter from the outer edge of the female screw 9c toward the other end side opening 8a of the cylindrical body 8 between the outer edge of the female screw 9c and the inner end of the flat plate portion 9f. It is a thing. That is, a hook-shaped guide surface 9 e is formed on a part of the lid body 9.

  The guide surface 9e is formed by a circular arc curved downward on the cylindrical body 8 side and having a center on the axis XX line of the cylindrical body 8. The upper end opening diameter R1 of the guide surface 9e is preferably set to about 20 mm or more when the inner diameter R2 of the cylindrical body 8 is about 45 to 50 mm and the inner diameter of the female screw 9c is about 6 mm.

Other structures and installation work of the sheath tube 7 are the same as those in the first embodiment.
In the fourth embodiment, the same operations and effects as in the first embodiment are achieved.

Furthermore, according to the fourth embodiment, one type of lid body 9 can correspond to the cylindrical body 8 having the inner diameter R2 shown in FIG. 8 and the cylindrical body 8 having an inner diameter smaller than the inner diameter R2. There is no need to change the press die of the lid 9 for different cylindrical bodies 8, the manufacture and management of the sheath tube 7 is easy, and the cost can be reduced.
[Example 5]
FIG. 9 shows a fifth embodiment.

  The fourth embodiment is a modification of the guide surface 9e of the lid body 9 and is a flat plate portion 9f orthogonal to the axis XX of the cylindrical body 8 from the outer peripheral portion 9a of the lid body 9 toward the inside. A taper-like shape that increases in diameter from the outer edge of the female screw 9c toward the other end side opening 8a of the cylindrical body 8 between the outer edge of the female screw 9c and the inner end of the flat plate portion 9f. It is formed on a flat surface. That is, an inverted conical guide surface 9 e is formed on a part of the lid body 9.

  The upper end opening diameter R1 of the guide surface 9e is preferably set to about 20 mm or more when the inner diameter R2 of the cylindrical body 8 is about 45 to 50 mm and the inner diameter of the female screw 9c is about 6 mm.

Other structures and installation work of the sheath tube 7 are the same as those in the first embodiment.
Also in the fifth embodiment, the same operations and effects as in the fourth embodiment are achieved.
[Other Examples]
The shape of the guide surface 9e is not limited to the shape shown in the first to fifth embodiments. The diameter of the guide surface 9e increases from the outer edge of the female screw 9c toward the other end side opening 8a of the cylindrical body 8, and Any shape can be used as long as the tip on the insertion side can be guided to the female screw 9c.

DESCRIPTION OF SYMBOLS 1 Concrete formwork 5 Mounting member 5b Bolt insertion hole 6 Positioning member 7 Sheath pipe 8 Cylindrical body 8a One end side opening part 8b Hollow part 8c Other end side opening part 9 Lid body 9c Female screw 9e Guide surface 10 Bolt 10b Male screw

Claims (2)

A cylindrical body having a hollow portion open at both ends, and a lid body fixed to one end of the cylindrical body and having a female screw at the center thereof,
The other end side opening of the cylindrical body is closed with a mounting member having a bolt insertion hole, and a bolt with a male screw engraved at the tip is inserted into the cylindrical body from the bolt insertion hole, and the bolt A sheath tube that is detachably disposed with respect to the concrete form by screwing the male screw with the female screw of the lid,
The inner side surface of the lid body is increased in diameter toward the other end side opening of the cylindrical body over the entire length from the outer edge of the female screw to the outer peripheral portion of the lid body, and the distal end on the insertion side of the bolt is A sheath pipe for a concrete member, characterized in that it is formed on a guide surface that leads to the female screw. A sheath tube having a cylindrical body having a hollow portion open at both ends, and a lid body fixed to one end of the cylindrical body and having a female screw at the center thereof;
A mounting member for detachably arranging the sheath tube with respect to the concrete formwork,
The mounting member has a bolt insertion hole, and a sheath tube positioning member protruding inward from the periphery of the bolt insertion hole in the concrete formwork,
After engaging the other end of the cylindrical body with the positioning member of the sheath tube and closing the other end side opening of the cylindrical body with an attachment member,
A bolt with a male screw engraved at the tip is inserted into the cylindrical body through the bolt insertion hole, the male screw of the bolt is screwed into the female screw of the lid, and the sheath tube is connected to the concrete formwork. After detachably placing against
A concrete member manufacturing method in which concrete is placed in the concrete formwork, and a sheath tube is embedded so that the opening on the other end side opens on the surface of the concrete member,
The inner side surface of the lid body is increased in diameter toward the other end side opening of the cylindrical body over the entire length from the outer edge of the female screw to the outer peripheral portion of the lid body, and the distal end on the insertion side of the bolt is A method for producing a concrete member, characterized in that the concrete member is formed on a guide surface that is guided by the female screw.

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