JPH1162920A - Blind joint and work executing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join a concrete member to be joined by a powerful joint structure having no protrusion part from an outline. SOLUTION: Lock members 1 having a perforated ring 2 are respectively mounted on the tips of anchor bars 101a and 101b positioned facing each other and buried in concrete. A wedge pin 10 having a taper and a sleeve 20 fitted externally of the wedge pin are inserted in a cavity 4. By pressing concrete members 100a and 100b, the perforated ring 2 and the wedge pin 10 are firmly intercoupled through a sleeve 20 by a wedge action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure which can be used as a joint for various structures, is built in a member, and cannot be seen from the outside. In the present invention, such a joint structure is referred to as a blind joint.

[0002]

2. Description of the Related Art Conventionally, various types of joints, such as flange joints, having high strength have a contour larger than a cross section of a structural member, which hinders the appearance of the structure. In order to protect the aesthetic appearance by covering this, it is necessary to surround the entire member so as to have a large profile including a flange, and there is a problem that the space is wastefully increased and the economy is lacking. on the other hand,
Some joints emphasize the aesthetics of the joint part and make the contour equal to or smaller than the cross section of the member, but such a conventional joint structure has low strength and the necessary joint strength or transmission of stress is not sufficient. There is a drawback that you can not.

[0003] Regarding joints of precast concrete members, the biggest problem with precast concrete members is that joints are used in order to obtain unity and continuity by arranging and joining single members. . If a joint having a high strength is required for the joint, the appearance of the structure is hindered. If the appearance is emphasized, the necessary strength or stress may not be transmitted sufficiently.

[0004]

Therefore, in order to secure the required strength without deteriorating the appearance, it is necessary to provide a joint of a type that connects only within the contour of the joint surface of concrete.
The problem here is that the joining surface is invisible to the operator, and that accurate positioning is very difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint which has a function of automatically fitting into a correct position, has a necessary strength, and can be securely connected even when it is not visible. The present invention, for example, joints such as precast concrete columns, piles, etc., ensure the integrity, continuity, large strength, and can be installed within the cross section of the member,
It is an object of the present invention to develop and provide a blind joint that solves the above-mentioned problems as a joint that does not appear on the outer surface and does not impair the aesthetic appearance.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above problems, and its technical means are as follows. First, a first invention provides a blind joint comprising the following parts.

(A) A coaxial cylindrical hollow portion for fixing a base portion to the tip of an anchor bar and inserting a wedge pin, and a hole coaxially fixed to an open end of the hollow portion and having an inner diameter smaller than the diameter of the hollow portion. A locking member comprising a perforated ring having: (b) a length approximately twice as long as the depth of the locking member, a frustoconical tapered cone at each end in the longitudinal direction, and a central portion having a cylindrical shape. A wedge pin to be formed (c) a thin-walled cylinder having an inner diameter loosely fitted to the outer diameter of the center portion of the wedge pin, and a frusto-conical cylinder having an inner diameter fitted to the small-diameter end of the tapered truncated cone and having an outer shape of a truncated cone. A sleeve provided in the axial direction and provided with an axial slit for expanding the diameter at both ends in the longitudinal direction.In the assembled state, the blind joint made of such components is opposed to each other on the contact surfaces of the concrete members to be joined. No A coaxial cylindrical hollow portion for fixing the base portion to the tip of the Kerr muscle and inserting a wedge pin, and a perforated ring fixed coaxially to the open end of the hollow portion and having a hole having an inner diameter smaller than the diameter of the hollow portion. A locking member made of concrete is embedded in concrete and attached, has a length approximately twice the depth of the locking member, has flared and tapered truncated cones at both ends in the longitudinal direction, and has a cylindrical central portion. A wedge pin to be formed is inserted into each of the opposed locking members, and a thin-walled cylinder having an inner diameter loosely fitted to the outer diameter of the central portion of the wedge pin, and an outer diameter having an inner diameter fitted to a small-diameter end of the tapered frustoconical shape, A frusto-conical cylinder and a frusto-conical cylinder are connected in the axial direction, and a sleeve provided with an axially expanding slit at both ends in the longitudinal direction is provided between the outer circumference of the frustum of the wedge pin and the perforated ring of the locking member. Crimp and opposite ends of wedge pin A blind joint, characterized in that it comprises a strongly fixed structure two ring-shaped locking member that.

The above blind joint can be constructed by the following construction method. That is, a coaxial cylindrical hollow portion in which a base portion is fixed to the tip of an anchor bar and a wedge pin is inserted, and a hole having an inner diameter smaller than the diameter of the hollow portion and coaxially fixed to an open end of the hollow portion. A locking member consisting of a ring is attached to the opposite anchoring bar of the mutually abutting surfaces of the concrete members to be joined, and is provided buried in the concrete, and the inner diameter of the wedge pin is loosely fitted to the outer diameter of the central portion. A thin-walled cylinder having a diameter and a frusto-conical cylinder having an inner diameter externally fitted to the small-diameter end of the tapered truncated cone and having an outer shape of a truncated cone, and having axial expansion slits at both ends in the longitudinal direction. The outer sleeve is fitted over a wedge pin having a length substantially twice as long as the depth of the locking member and having flared and tapered truncated cones at both ends in the longitudinal direction and having a cylindrical central portion. Within one of the members, The widened end is inserted, the perforated ring-shaped members of the concrete member to be joined are opposed to each other and brought into close contact with each other, and the wedge pin and the tapered sleeve support the reaction force on the opposite surface of the concave portion of the anchoring bar. And pressed axially together, the tapered sleeve is
Each of the flanges and the wedge pin are pressed and opened in a wedge shape, and the sleeve is pressed between the outer surface of the truncated cone at both ends of the wedge pin and the inner surface of the perforated ring-shaped member to concrete. This is a brand joint construction method characterized by firmly joining members.

Next, a second invention of the present invention is a blind joint comprising the following parts. (A) A coaxial cylindrical hollow portion in which a base portion is fixed to the tip of an anchor bar and a wedge pin is inserted, and a hole having an inner diameter smaller than the diameter of the hollow portion and coaxially fixed to an open end of the hollow portion. (B) a wedge pin having a length substantially equal to the depth of the locking member and having a truncated cone at one end in the longitudinal direction and being insertable into the locking member; A sleeve having a cylindrical portion having an outer diameter fitted to the inner diameter of the perforated ring and a cavity fitted externally to a smaller diameter portion of the truncated cone of the wedge pin at the distal end side with a base screwed into an insert embedded in concrete. The present invention is used for joining members whose reinforcing bars are not provided facing each other, in which an insert is provided on the other member, and a member engaged with the insert is used as a connecting member. The blind joint has a coaxial cylindrical hollow portion into which a base portion is fixed at one end of an anchor bar of a contact surface of a concrete member to be joined and a wedge pin is inserted, and is coaxially fixed to an open end of the hollow portion. A locking member comprising a perforated ring having a hole having an inner diameter smaller than the diameter of the hollow portion is embedded in concrete and attached, and has a length substantially equal to the depth of the locking member in the locking member. A sleeve having a tapered truncated cone at one end in the longitudinal direction, an insertable wedge pin inserted into the locking member, an insert embedded in the other opposing concrete surface, and a base screwed to the insert. Is press-fitted into a wedge-shaped gap between the outer surface of the truncated cone and the perforated ring of the locking member so as to firmly connect the concrete member.

The method of the present invention for constructing the blind joint according to the second aspect of the present invention comprises a coaxial cylindrical hollow portion for fixing a base portion to a tip of an anchor bar and inserting a wedge pin, and an open end of the hollow portion. And a perforated ring having a hole having an inner diameter smaller than the diameter of the hollow portion, which is coaxially fixed to the concrete member, is attached to one anchor bar of the contact surface of the concrete member to be joined, and is embedded in the concrete. A cylinder having an insert embedded in the other opposing concrete surface and having an outer diameter fitted to the inner diameter of the perforated ring and a cavity externally fitted to the small diameter portion of the truncated cone of the wedge pin at the tip side. A threaded base having a length substantially equal to the depth of the locking member and a tapered truncated cone at one end in the longitudinal direction; The wedge pin which can be inserted into the hole is fitted with the tip of the truncated cone into the cavity of the sleeve, and the holes of the perforated ring-shaped member of the other concrete member to be joined are opposed to the wedge pin so that the concrete members can be connected to each other. The wedge pins are brought into close contact with each other to support a reaction force on the bottom surface of the cavity of the locking member, and the sleeve is pushed open by the frusto-conical surface of the wedge pins by an axial thrust. And a concrete member is firmly joined by pressing the sleeve into a wedge-shaped gap between the sleeve and the inner surface of the joint.

A third aspect of the present invention is a blind joint comprising the following parts. (A) a locking member in which a slit having a dimension smaller than the groove width is provided in a groove opening having a rectangular groove shape in cross section; (b) a plate shape having a height almost twice the depth of the locking member; A wedge plate having a taper at each end in the height direction in which the thickness gradually increases and decreases, respectively; (c) a thickness portion inserted into a gap between the thickness of the central portion of the wage plate and the slit, and the thickness gradually decreases Two tightening members in which one surface in contact with the minimum plate thickness portion of the taper to be connected and a portion provided with a taper whose end portion has a reduced thickness are connected in series. The blind joint has a large joint area and the first or second blind joint. In a condition where a large number of parts of the brand joint of the invention of the invention must be arranged, a wedge plate is used in place of the wedge pin, and the parts are joined with a small number of strong fittings. In the third aspect of the invention, similarly to the first aspect of the invention, a locking member for inserting a wedge plate is buried in the end face of a concrete member to be opposed and joined with a reinforcing bar. In such a blind joint, a slit having a cross section in which the base is fixed to the tip of each of the oppositely facing anchor streaks of the abutting surface of the concrete member to be joined and having a section smaller than the groove width is formed in a rectangular groove-shaped groove opening. The provided locking member is buried in concrete and attached to form a plate having a height approximately twice the depth of the locking member, and tapered at both ends in the height direction such that the plate thickness gradually increases and decreases, respectively. A wedge plate having a thickness of a central portion of the wedge plate and a thickness of the wedge plate to be inserted into a gap between the slit and a minimum thickness of the taper at which the thickness gradually decreases. Two tightening members, each having a surface in contact with the thick portion and a tapered portion whose end is reduced in thickness, are pressed between the outer surface of the taper of the wedge plate and the inner surface of the slit of the locking member. hand
It has a structure in which both ends in the height direction of the wedge plate are firmly fixed to two opposing locking members.

In the construction of the blind joint according to the third aspect of the present invention, the engaging member is provided with a slit having a rectangular groove-shaped cross-section at a contact surface of a concrete member to be joined and a slit having a dimension smaller than the groove width. Embedded in a plate shape having a height of about twice the depth of the locking member, on both sides of a wedge plate having a taper whose thickness gradually increases and decreases at both ends in the height direction, on both surfaces of the wedge plate, A portion having a thickness of a central portion and a thickness of a plate to be inserted into a gap between the slits, and a portion having a taper where the thickness of the one end surface and the end side contacting a minimum thickness portion of the taper whose thickness gradually decreases is reduced. Is inserted into one of the locking members with two tightening members connected in series,
The other concrete members to be joined are brought into close contact with each other with the engaging members facing each other, and the tightening members are pressed between the outer surfaces of the tapered sides of the wedge plate and the inner surfaces of the slits of the engaging members to join the concrete members. It can be easily realized by a brand joint construction method characterized by the above.

Next, a fourth invention of the present invention is similar to the above-mentioned third invention, when the joint area of the concrete member to be joined is large and there is no rebar facing the other concrete joint surface. This is suitably used instead of arranging a large number of parts of the brand joint of the second invention. In other words, in place of the wedge pin in the second invention, a wedge plate is used, and the members arranged on the opposing joint surfaces are connected to the insert as in the second invention. Such a blind joint is a blind joint comprising the following components.

(A) A locking member in which a slit having a dimension smaller than the groove width is provided at a groove opening having a rectangular groove shape in cross section. (B) A plate-like member having a height substantially equal to the depth of the locking member. A wedge plate having a taper at one end in the longitudinal direction and capable of being inserted into the locking member and having a taper whose thickness gradually decreases. (C) The width of connecting the base to an insert embedded in concrete and inserting the slit at the tip end and the width of the wedge plate. A tightening member consisting of a U-shaped cross-section plate with an inner dimension in contact with the tapered minimum thickness portion where the plate thickness gradually decreases.The joint constituted by this part is one of the contact surfaces of the concrete members to be joined. A locking member having a rectangular groove-shaped groove opening with a slit narrower than the groove width provided with a base fixed to the tip of the anchor muscle is embedded in concrete and attached, and the depth of the locking member is reduced. A wedge plate having a tapered shape whose thickness is gradually reduced at one end in the height direction and capable of being inserted into the locking member, and having a height approximately twice the depth of the locking member. Insert a wedge plate having a tapered shape with gradually increasing and decreasing thickness at both ends in the height direction into the locking member, connecting the base to the insert embedded in concrete, and connecting the base to the tip side. A tightening member made of a U-shaped cross section plate having a width in which a slit is inserted and a tapered minimum thickness portion where the thickness of the wedge plate gradually decreases is formed by a tapered outer surface of the wedge plate and the locking member. A blind joint characterized by having a structure in which a concrete member is firmly fixed by being pressed against the inner surface of a slit.

[0015] The construction method includes embedding a locking member having a slit having a dimension smaller than the groove width in a groove opening having a rectangular cross section in a contact surface of a concrete member to be joined,
Inserting a wedge plate into a plate having a plate shape having a height substantially equal to the depth of the locking member and having a taper at one end in the height direction and having a taper whose thickness is gradually reduced and insertable into the locking member. Then, the base is joined to the insert embedded in the concrete, the width of the slit passing through the tip side, and the inside dimension of the inner plate in contact with the tapered minimum thickness portion where the thickness of the wedge plate gradually decreases is a U-shaped cross section. A tightening member made of a plate is pressed between the outer surface of the taper of the wedge plate and the inner surface of the slit of the locking member, and the tightening member is pressed between the outer surface of the taper on both sides of the wedge plate and the inner surface of the slit of the locking member. This is a brand joint construction method characterized by joining concrete members together.

[0016]

FIG. 3 is an exploded view showing a first embodiment of the present invention. The locking member 1 shown in FIGS. 3A and 3D is attached to each joint surface of the concrete member to be joined, and is provided on the base portion 3 having the female screw 5 fixed to the tip of the anchor bar. It has a cylindrical cavity 4, which has an opening on the joining surface side, and a perforated ring 2 which is coaxially fixed at the opening end. The locking member 1 is attached to the joining surfaces of two concrete members to be joined so as to face each other, and the wedge pin 10 is inserted into the two perforated rings 2 and the cavity 4 which are provided so as to face each other. The wedge pin 10 has a length approximately twice as large as the depth of the locking member 1 (the sum of the thickness of the perforated ring 2 and the depth of the hollow portion 4). Truncated cones 13 and 12 are provided, and the central part has a cylindrical shape 11. The inner diameter of the perforated ring 2 is smaller than the inner diameter of the cavity 4. The inner diameter of the perforated ring 2 and the truncated cone 12 or 13 of the wedge pin 10 are tightly locked by the sleeve 20 when the part is assembled. The sleeve 20 has a thin-walled cylinder 21 having an inner diameter 22 which fits loosely on the outer diameter of the center portion of the wedge pin 10, and a frustoconical cylinder 23 having an inner diameter 24 which is externally fitted on a small-diameter end of the tapered truncated cone and having an outer shape of a truncated cone. And axially extending slits 2 at both ends in the longitudinal direction.
5 and 26 are provided.

FIG. 2 shows the above components as concrete members 10.
0a, 100b, and the members 100a, 10b
0b is shown in a coupled state. As shown in FIG. 2, the locking member 1 is a concrete member 10 to be joined.
It is embedded in a position facing each other on the contact surfaces of 0a and 100b. The locking member 1 is fixed by screwing the base 3 to a male screw at the tip of an anchor streak 101a, 101b of each concrete member 100a, 100b.
The locking member 1 includes a cylindrical hollow portion 4, and a perforated ring 2 at an opening end of the hollow portion 4 on the joining surface side. The perforated ring 2 is fixed coaxially with the cavity 4,
Has an inner diameter smaller than the diameter of Wedge pins 10 are inserted into two opposing cavities 4. The wedge pin 10 has a length that is approximately twice the total dimension of the thickness of the perforated ring 2 of the locking member 1 and the depth of the cavity 4,
At both ends in the longitudinal direction, there are flared and tapered truncated cones, respectively, and the central part is cylindrical.

A sleeve 20 is fitted around the wedge pin 10. The sleeve 20 has a thin-walled cylinder and a truncated-cone cylinder connected in the axial direction, and has a plurality of axial slits at both ends in the longitudinal direction. The inner diameter of the thin-walled cylinder is dimensionally fitted to the outer diameter of the central portion of the wedge pin 10. The frusto-conical cylinder has an inner diameter fitted to the small-diameter end of the tapered truncated cone of the wedge pin 10, and has an outer shape of a truncated cone. The sleeve 20 is interposed between the inner diameters of the two opposing perforated rings 2 and the tapered portion of the wedge pin 10, and the two wedge ring-shaped parts formed by the frustoconical portion of the wedge pin 10 and the perforated ring. These are press-fitted into the gaps, respectively, and are tied together by wedge action. Due to this binding, the tensile force in the longitudinal direction of the two members 100a and 100b is transmitted by connecting the reinforcing bars by wedge force, the shear force is supported by the wedge pin, and the compressive force is supported by the concrete end face. Therefore, a strong blind joint can be formed.

FIG. 1 is an explanatory view of a step of connecting the blind joint shown in FIG. The engaging members 1 are screwed into the ends of the opposite anchor bars 101a, 101b of the mutually abutting surfaces of the concrete members 100a, 100b to be joined, respectively.
a and 102b. The wedge pin 10 with the sleeve fitted therein is inserted into the hollow portion of the locking member 1 of the one concrete member 100a with the divergent frustoconical portion at the back. The end surface of the concrete member 100b is brought close to the end surface of the concrete member 100a so that the center lines of the engaging members facing each other on the end surface of the other concrete member 100b are aligned, and the tip of the tapered frustoconical portion of each wedge pin 10 is connected to the concrete member 100b. Then, the concrete members are pressed against each other until the end faces of the concrete members come into close contact with each other. In this way, the concrete member is joined by pressing the sleeve into the wedge ring-shaped gap between the outer surface of the truncated cone at both ends of the wedge pin 10 and the inner surface of the perforated ring-shaped member.

Embodiments of the second invention of the present invention are shown in FIGS. FIG. 4 shows two concrete members 100a, 10a
0b shows the state immediately before the connection of the blind joint,
FIG. 5 shows a state in which the connection is completed. One concrete member 100a has a coaxial cylinder for fixing the base 3 to the tip of an anchor bar (not shown but similar to FIG. 1) and inserting the wedge pin 40 in the same manner as in the first invention. A locking member comprising a hollow portion 4 having a shape of a circle and a perforated ring 2 having a hole having an inner diameter smaller than the diameter of the hollow portion and fixed coaxially to the open end of the hollow portion 4 is provided. The wedge pin has a length substantially equal to the depth of the locking member 1 and has a truncated cone at one end in the longitudinal direction.
Can be inserted into the hollow portion.

In the second invention, the insert 30 is embedded in the other concrete member 100b at a position facing the locking member 1. That is, this corresponds to the case where the reinforcing bar is inside the opposing position. A base was screwed into the insert 30, and a cylinder having an outer diameter on the distal end side to fit the inner diameter of the perforated ring 2 and having a cavity externally fitted to the small diameter portion of the truncated cone of the wedge pin 40 was provided. A sleeve 50 is provided.

As shown in FIG. 4, a locking member 1 is attached to the tip of the anchor bar of one concrete member 100a and buried in the concrete. The locking member 1 has a base portion 3 fixed to a reinforcing bar, a cylindrical hollow portion 4 into which a wedge pin 40 is inserted, and a perforated ring 2 coaxially fixed to an open end of the hollow portion 4. . The perforated ring 2 has a hole with an inner diameter smaller than the diameter of the cavity 4. The wedge pin 40 is inserted into the tip of the sleeve 50, and the base of the sleeve 50 is screwed into the insert 30 of the other concrete member 100b. Next, the locking member 1 of the concrete member 100 a faces the wedge pin 40, and the hole of the perforated ring 2 of the locking member 1 is put on the wedge pin 40. FIG.
The tip of the wedge pin 40 is just the hollow portion 4 of the locking member 1.
Shows a state in which the bottom of is reached. Next, the concrete members 100a and 100b are pressed until the end faces are brought into close contact with each other, and the state shown in FIG.
0, the sleeve 5 is inserted into a wedge ring-shaped gap formed by the truncated cone of the wedge pin 40 and the inner diameter of the perforated ring 2.
0 is firmly pressed, and the connection of the blind joint is completed. According to the second aspect of the present invention, the two concrete members to be joined are suitable for joining concrete members whose longitudinal reinforcing bars do not oppose each other. Can be.

FIGS. 6 and 7 show a blind joint similar to that of FIGS. 4 and 5 except that a wedge pin 60 is formed in the locking member 1 in advance. That is, it has a wedge pin 60 protruding from the bottom surface of the hollow portion 4 of the locking member 1. Therefore, instead of inserting the wedge pin into the sleeve 50 and then screwing the base of the sleeve into the insert 30, only the sleeve 50 needs to be screwed. 6 and 7 correspond to FIGS. 4 and 5, respectively, and their contents will be clear from the above description.

FIG. 8 illustrates a blind joint emphasizing the shearing of the joint. This is an example in which any of the above blind joints 70 is arranged on the end faces of the concrete members 100a and 100b to be joined, and a shear key 71 for securing a shearing force is provided on the joining end faces. Next, a third invention of the present invention will be described. Due to the balance with the strength of the joint, the wedge pin and the cylindrical engagement member described above reduce the number of parts when a very large number of members need to be arranged on the end face of the concrete member, In order to obtain a large coupling force, a wedge plate is used instead of the wedge pin, and a locking member having a slit-shaped recess is used instead of the cylindrical locking member.

That is, a member in which a slit having a dimension smaller than the groove width is provided at a groove opening having a rectangular cross section as a locking member, and has a height approximately twice the depth of the locking member. ,
Combined with a wedge plate having a taper whose plate thickness gradually increases and decreases at both ends in the height direction, and a plate-like wedge is formed between the taper of this wedge plate and the width of the slit. It uses two tightening members inserted into the gap.

FIG. 9 is a perspective view showing this. A rectangular groove-shaped locking member is provided on the contact surfaces of the concrete members 100a and 100b to be joined, and a wedge plate is inserted into the locking member. Two tightening members are inserted between the wedge plate and the locking member. The schematic arrangement of the blind joint 80 which has been crimped is shown. The cross section is shown in FIGS.
It has a shape similar to FIG. In FIG. 9, reference numeral 90 denotes a guide pin for positioning a concrete member to be joined. Reference numeral 90 denotes a guide pin for positioning the joining member.

[0027]

According to the present invention, high-strength joining can be reliably performed within the range of the profile of the concrete member. Therefore, for example, in the field of construction, it is possible to freely adopt full precasting, framing, blanking, and the like, and the degree of freedom in design and construction is dramatically improved. In the field of civil engineering, it can be effectively used for products that emphasize landscape, such as parks, hydrophilic spaces, and building exteriors, and for two or more divided structures. If the strength is low, retaining walls, gutters, waterways, etc. It can be widely used as a joint of a linear structure, and can meet a great potential demand, and greatly contributes to technical improvement in a wide range of technical fields.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state immediately before joining of a blind joint according to an embodiment.

FIG. 2 is a cross-sectional view showing a joined state of a blind joint according to the embodiment.

FIG. 3 is an exploded view of the blind joint of the embodiment.

FIG. 4 is a cross-sectional view showing a state immediately before joining of a blind joint according to the embodiment.

FIG. 5 is a cross-sectional view showing a joined state of the blind joint of the embodiment.

FIG. 6 is a cross-sectional view showing a state immediately before joining of the blind joint of the embodiment.

FIG. 7 is a cross-sectional view showing a joined state of the blind joint of the embodiment.

FIG. 8 is a perspective view illustrating a blind joint of the embodiment.

FIG. 9 is a schematic view showing an arrangement of a blind joint according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking member 2 Perforated ring 3 Base part 4 Cavity part 5 Internal thread 10 Wedge pin 11 Cylindrical shape 12, 13 Truncated cone 20 Sleeve 21 Thin cylinder 22, 24 Inside diameter 23 Truncated cone 25, 26 Slit 30 Insert 40, 60 Wedge pin 50 Sleeve 70, 80 Blind joint 71 Shear key 90 Guide pin 100a, 100b Concrete member 101a, 101b Anchor bar 102a, 102b Contact surface

Claims (12)

[Claims] 1. A blind joint comprising the following parts. (A) A coaxial cylindrical hollow portion in which a base portion is fixed to the tip of an anchor bar and a wedge pin is inserted, and a hole having an inner diameter smaller than the diameter of the hollow portion and coaxially fixed to an open end of the hollow portion. (B) a wedge pin having a length approximately twice as long as the depth of the locking member, a flared and tapered truncated cone at each longitudinal end, and a cylindrical central portion; c) A thin-walled cylinder having an inner diameter loosely fitted to the outer diameter of the center portion of the wedge pin, and a frusto-conical cylinder having an inner diameter fitted to the small-diameter end of the tapered truncated cone and having an outer shape of a truncated cone. Sleeves provided in series with axial slits for diameter expansion at both longitudinal ends 2. A coaxial cylindrical hollow portion into which a base portion is fixed to a tip of each of opposite anchor bars of a contact surface of a concrete member to be joined and a wedge pin is inserted, and an open end of the hollow portion is provided. A locking member, which is coaxially fixed and has a perforated ring having a hole having an inner diameter smaller than the diameter of the hollow portion, is mounted by being embedded in concrete, and has a length substantially twice the depth of the locking member. A wedge pin having flared and tapered truncated cones at both ends in the longitudinal direction and having a central portion having a cylindrical shape is inserted into each of the opposed locking members, and has an inner diameter that is loosely fitted to the outer diameter of the central portion of the wedge pin. A sleeve provided with a thin-walled cylinder and a truncated cone having an inner diameter fitted to the small-diameter end of the tapered truncated cone and having an outer shape of a truncated cone in the axial direction, and provided with a diameter-enlarging axial slit at both longitudinal ends. The wedge pin outside the truncated cone A blind joint having a structure in which both ends of a wedge pin are firmly fixed to two opposed ring-shaped locking members by being pressed between a periphery and a perforated ring of the locking member. 3. A coaxial cylindrical hollow portion into which a base portion is fixed at the tip of an anchor bar and a wedge pin is inserted, and a hole having an inner diameter smaller than the diameter of the hollow portion and coaxially fixed to an open end of the hollow portion. A locking member consisting of a perforated ring having the perforated ring is attached to the opposite anchoring bar of the mutual contact surface of the concrete members to be joined, and is provided buried in the concrete. A thin-walled cylinder having an inside diameter to be fitted, and a truncated conical cylinder having an inside diameter fitted to the small-diameter end of the tapered truncated cone having an inside diameter and having a truncated cone shape are connected in the axial direction. A sleeve provided with a slit is externally fitted to a wedge pin having a length substantially twice as long as the depth of the locking member and having a flared and tapered truncated cone at both ends in the longitudinal direction and a central portion having a cylindrical shape, In one of the locking members The divergent end is inserted, the perforated ring-shaped members of the concrete member to be joined are opposed to each other and brought into close contact with each other, and the wedge pin and the tapered sleeve exert a reaction force on the opposite surface of the concave portion of the anchor streak. Supported and pressed in the axial direction with each other, the tapered sleeves are pushed open by the two tapers of the wedge pin, respectively, are pressed in a wedge shape between the flange and the wedge pin, and the outer surfaces of the truncated cones at both ends of the wedge pin. A method of constructing a brand joint, wherein the sleeve is press-bonded to an inner surface of a perforated ring-shaped member to firmly join a concrete member. 4. A blind joint comprising the following parts. (A) A coaxial cylindrical hollow portion in which a base portion is fixed to the tip of an anchor bar and a wedge pin is inserted, and a hole having an inner diameter smaller than the diameter of the hollow portion and coaxially fixed to an open end of the hollow portion. (B) a wedge pin having a length substantially equal to the depth of the locking member and having a truncated cone at one end in the longitudinal direction and being insertable into the locking member; A sleeve provided with a cylindrical portion having a base portion screwed into an insert embedded in concrete, and having a front end with an outer diameter fitted to the inner diameter of the perforated ring and a cavity fitted externally to a small diameter portion of the truncated cone of the wedge pin. 5. A coaxial cylindrical hollow portion into which a base portion is fixed to one end of an anchor bar of a contact surface of a concrete member to be joined and a wedge pin is inserted, and coaxially fixed to an open end of the hollow portion. A locking member comprising a perforated ring having a hole having an inner diameter smaller than the diameter of the hollow portion is embedded in concrete and attached, and has a length substantially equal to the depth of the locking member in the locking member. A sleeve having a tapered truncated cone at one end in the longitudinal direction, an insertable wedge pin inserted into the locking member, an insert embedded in the other opposing concrete surface, and a base screwed to the insert. A blind joint characterized in that the concrete member is firmly connected to a wedge-shaped gap between the outer surface of the truncated cone and the perforated ring of the locking member. 6. A coaxial cylindrical hollow portion for fixing a base portion to a tip of an anchor bar and inserting a wedge pin, and a coaxially fixed hole at an open end of the hollow portion and having an inner diameter smaller than the diameter of the hollow portion. A locking member consisting of a perforated ring having the same is attached to one anchor bar of the contact surface of the concrete member to be joined, is embedded in the concrete, and an insert is embedded in the other opposing concrete surface. At the distal end of the insert, the base of a sleeve having a cylinder having an outer diameter fitted to the inner diameter of the perforated ring and a cavity fitted externally to the small diameter portion of the truncated cone of the wedge pin is screwed into the cavity of the sleeve. A truncated cone having a length substantially equal to the depth of the locking member and having a tapered truncated cone at one end in the longitudinal direction, and a wedge pin insertable into the locking member is fitted with the tip of the truncated cone into the cavity of the sleeve. The holes of the perforated ring-shaped member of the other concrete member to be joined and the wedge pins are opposed to each other to bring the concrete members into close contact with each other, and the wedge pins support the reaction force on the bottom surface of the cavity of the locking member. Then, the sleeve is pushed open by the frusto-conical surface of the wedge pin by axial thrust, and the sleeve is pressed into a wedge-shaped gap between the outer surface of the frusto-conical surface of the wedge pin and the inner surface of the perforated ring-shaped member, thereby solidifying the concrete member. A brand joint construction method characterized by joining to a joint. 7. A blind joint comprising the following parts. (A) a locking member in which a slit having a dimension smaller than the groove width is provided in a groove opening having a rectangular groove shape in cross section; (b) a plate shape having a height almost twice the depth of the locking member; A wedge plate having a taper at each end in the height direction in which the thickness gradually increases and decreases, respectively; (c) a thickness portion inserted into a gap between the thickness of the central portion of the wage plate and the slit, and the thickness gradually decreases Fastening members having one surface in contact with the minimum thickness portion of the taper to be connected and a portion provided with a taper whose end portion has a reduced thickness. 8. A rectangular groove-shaped groove opening having a base fixed to the distal end of each of the oppositely facing anchor streaks of the contact surface of the concrete member to be joined is provided with a slit having a dimension smaller than the groove width. The locking member is buried in concrete and attached, has a plate shape having a height approximately twice the depth of the locking member, and has a taper at both ends in the height direction where the thickness gradually increases and decreases, respectively. A portion of the thickness of the wedge plate to be inserted into the gap between the thickness of the central portion of the wedge plate and the slit, and a minimum thickness portion of the taper where the thickness gradually decreases. The two tightening members provided in series with one surface in contact with the end and a portion provided with a taper whose end is reduced in thickness are pressed between the outer surface of the taper of the wedge plate and the inner surface of the slit of the locking member,
A blind joint having a structure in which both ends in the height direction of a wedge plate are firmly fixed to two opposing locking members. 9. A locking member in which a slit having a dimension smaller than a groove width is provided at a groove opening having a rectangular cross section in a contact surface of a concrete member to be joined, and the depth of the locking member is substantially equal to the depth of the locking member. It has a plate shape with twice the height, and on both sides of a wedge plate having a taper whose thickness gradually increases and decreases at both ends in the height direction, a gap between the thickness of the center portion of the wedge plate and the slit. A part having a thickness to be inserted, a surface in contact with a minimum thickness part of a taper in which the thickness gradually decreases, and a part provided with a taper in which the thickness is reduced on an end side are connected to each other.
The other concrete members to be joined are brought into close contact with each other with the respective locking members facing each other, and the outer surfaces of the taper on both sides of the wedge plate and the slits of the locking members are attached together with a pair of tightening members. A brand joint construction method, wherein the concrete member is joined by press-fitting the tightening member to an inner surface. 10. A blind joint comprising the following parts. (A) A locking member in which a slit having a dimension smaller than the groove width is provided at a groove opening having a rectangular groove shape in cross section. (B) A plate having a height substantially equal to the depth of the locking member is formed. A wedge plate having a tapered end at one end and capable of being inserted into the locking member. (C) The width at which the base is connected to the insert embedded in concrete and the slit is inserted at the tip end and the thickness of the wedge plate are reduced. A tightening member comprising a U-shaped cross-section plate having an inner dimension in contact with a minimum thickness portion of a taper having a gradually decreasing taper. 11. A locking member having a rectangular groove-shaped groove opening having a narrower cross-section than a groove width, the base of which is fixed to the tip of one anchor streak of the contact surface of the concrete member to be joined. Embedded in concrete and attached, in the form of a plate having a height substantially equal to the depth of the locking member,
A wedge plate having a taper at one end in the height direction, the thickness of which is gradually reduced, and having a height of approximately twice the depth of the locking member, and having a height of approximately two times the height of the locking member; Insert a wedge plate having a taper whose thickness gradually increases and decreases into the locking member, connect the base to an insert embedded in concrete, insert the slit at the tip end side, and the thickness of the wedge plate. A clamping member made of a U-shaped cross section plate having an inner dimension in contact with the smallest thickness portion of the taper where the taper gradually decreases is pressed between the outer surface of the taper of the wedge plate and the inner surface of the slit of the locking member, A blind joint having a structure in which a concrete member is firmly fixed. 12. A locking member in which a slit having a dimension smaller than a groove width is provided in a groove opening having a rectangular cross section on a contact surface of a concrete member to be joined, and has a depth substantially equal to the depth of the locking member. A wedge plate which has a plate shape having a height and has a taper at one end in the height direction and has a taper whose thickness gradually decreases and which can be inserted into the locking member, is inserted into the locking member, and a base is inserted into the concrete embedded in the concrete. A tightening member formed of a U-shaped cross-section plate having a width in which the slit is inserted into the front end side and an inner dimension in contact with a tapered minimum thickness portion where the thickness of the wedge plate is gradually reduced. The tightening member is pressed between the outer surface of the taper on both sides of the wedge plate and the inner surface of the slit of the locking member. A brand joint construction method characterized by joining the members.