JPH0685495U - PC steel connection tool for concrete members - Google Patents

Abstract

(57) [Abstract] [Purpose] To securely connect the upper and lower PC steel materials. [Structure] The coupler 15 is connected to the lower PC steel material 9.
The upper PC steel material 13 is inserted into the duct 14 of the upper division unit 2. The male screw portion 13A at the lower end of the upper PC steel material 13 is connected to the coupler 15. A guide hole 27 that expands upward is provided in the upper portion of the coupler 15. [Effect] When the upper PC steel material 13 is inserted from the upper portion of the duct 14, the male screw portion 13A at the lower end thereof is guided into the female screw portion 15A of the coupler 15 along the guide hole 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connector for connecting PC steel materials that tension-integrate concrete members, and in particular, a PC steel material for concrete members that butt concrete members together and connect PC steel materials through the connectors provided at these butting points. Connection equipment.

[0002]

[Prior art]

 It is known that the precast concrete members are tensioned and integrated with each other by PC steel materials, such as shed, keeper or box culvert, which require relatively strong strength. For the shed and keeper, concrete columns and concrete roofs are used. The box culverts are tension-unified with PC steel, and the box culverts are horizontally tightened with PC steel to unify tension. In the field construction of this precast concrete box culvert, the foundation concrete is placed at the bottom of the excavated trench, and the box culverts divided in the length direction are connected side by side on the foundation concrete. Backfill is performed. In addition, such precast concrete box culverts have superior workability as compared to the conventional cast-in-place concrete work, which requires no work such as formwork on site. By the way, in recent years, large box culverts have been installed, and the size of precast concrete box culverts manufactured by factories is also increasing. There was a difficult side. In addition, when increasing the size of the box culvert, the thickness of the box culvert increases in order to obtain a certain level of strength against wheel loads, which further increases the weight of the box culvert, which makes it difficult to carry it and install it on site. There was also a problem. In consideration of these problems, a precast concrete split box culvert, in which the box culvert is divided into upper and lower parts, has been proposed, which makes it possible to transport and install large box culverts that could not be transported in the past. . The box culvert divided into upper and lower parts bury the lower PC steel material in the side wall of the lower split unit and form a duct into which the upper PC steel material is inserted in the side wall of the upper split unit. The upper and lower split units are tension-integrated by the upper and lower PC steel members connected through a coupler as a connecting tool. By the way, in addition, when integrating the lower division unit on site, conventionally, after connecting the upper PC steel material via the coupler to the lower PC steel material embedded in the lower division unit, the duct was fitted to this upper PC steel material. The upper split unit was hung and the upper and lower split units were abutted against each other. However, the work of suspending the upper split unit by fitting ducts to multiple upper PC steel materials made the alignment complicated. There was a problem in workability and safety. Similarly, in the construction of the shed or keeper pillar and roof, the work of suspending the roof by aligning the roof duct with the upper PC steel material protruding from the top surface of the pillar through the connecting tool There was a problem of poor sex.

To solve this problem, a coupler is attached to the upper end of the lower PC steel material when the upper and lower split units are integrated, and the upper split unit is abutted against the lower split unit, and then the duct is used. It has been proposed that the upper PC steel material is inserted from above and the lower end of the upper PC steel material is screwed to the coupler to connect the upper and lower PC steel materials.

[0004]

[Problems to be solved by the device]

 In the connection of the above PC steel materials, the installation workability can be improved by connecting the upper and lower split steel units after the upper and lower split units are butted, but the upper and lower split units are butted. After that, a relatively long upper PC steel material loosely inserted from the upper part of the duct is screwed to the coupler hidden in this butt joint, so that the axial center between the upper PC steel material and the coupler that is inserted through the duct. It is a concern that the upper PC steel material cannot be smoothly connected to the coupler if it is misaligned.

Therefore, an object of the present invention is to provide a connecting member for a PC steel material of a concrete member capable of reliably connecting a PC steel material.

[0006]

[Means for Solving the Problems]

 The present invention forms a pair of precast concrete members that are tension-integrated by a pair of PC steel materials, in which one of the PC steel materials is embedded in the concrete member of the other, and the other concrete member of the other is formed. A duct for inserting the PC steel material is formed, one end side of a connector having a female screw portion is connected to the one PC steel material, the pair of concrete members are butted, and the other PC steel material is connected from the duct. In the PC steel material connector of the concrete member that is inserted and screwed the other PC steel material to the other end side of the connecting tool to connect the pair of PC steel materials, to the other end side of the connecting tool, A guide hole that expands toward the tip is provided.

[0007]

[Action]

 With the above configuration, when the other PC steel material is inserted from the duct, its tip is guided to the female screw portion of the connector along the guide hole.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, which shows an example in which the present invention is applied to a split box culvert which is a concrete member. The box culvert 1 is composed of a plurality of pairs of upper and lower split units 2 and 3, which are vertically divided into two parts. The top slab 4 of this upper split unit 2 and the bottom slab 5 of the lower split unit 3 are A plurality of unbonded PC steel materials 6 are arranged in a direction perpendicular to the axis of the box culvert 1, that is, in the width direction, and the unbonded PC steel materials 6 are tensioned by a post-tensioning method so that both ends are fixed by the fixing tools 7. A plurality of lower unbonded PC steel materials (hereinafter, referred to as lower PC steel materials) 9, which is one of the PC steel materials, is embedded in the side wall 8 of the lower division unit 3, and the lower PC steel material 9 has a nut 10 at its lower portion via a nut 10. An anchor plate 11 is embedded, and an upper portion thereof projects from the upper end surface of the side wall 8 to form a male screw portion 9A. A plurality of ducts 14 into which an upper unbonded PC steel material (hereinafter, referred to as upper PC steel material) 13 which is the other PC steel material is loosely inserted are formed on the side wall 12 of the upper division unit 2, and the lower portion of the duct 14 is formed. A taper portion 14A that expands downward is formed, and a male screw portion 13A is formed at the lower end of the upper PC steel material 13 and a male screw portion 13B is formed on the upper portion of the upper PC steel material 13. There is. In the figure, reference numeral 15 denotes a coupler which is a connecting tool for connecting both the PC steel materials 9 and 13, and is a cylindrical type made of cast iron or the like, and the male screw portions 9A and 13A are screwed to the inner surface of the coupler 15. A female screw portion 15A is formed. Reference numeral 16 is a horizontal tightening PC steel material for integrally tensioning the divided box culverts 1 in the longitudinal direction, and 17 is a duct through which the horizontal tightening PC steel material 16 is inserted. Reference numeral 18 denotes a fixing tool provided on the upper end of the upper PC steel material. The fixing tool 18 is composed of an anchor plate 19 and a nut 20, and the anchor plate 20 has a grout material injection hole communicating with the duct 17. 21 is bored and the duct 17 is filled with the grout material 22 through the injection hole 21. Further, 23 is a non-shrink mortar having a thickness of, for example, about 10 mm provided on the abutting surfaces of the upper and lower split units 2 and 3, and 24 is a water-stop sponge provided around the non-shrink mortar 23. Is. The PC steel materials 6, 9 and 13 are made of unbonded PC steel material coated with asphalt or tar to prevent concrete from adhering to the PC steel material.

In such a split box culvert 1, an enlarged cylindrical portion 26 is integrally formed on the upper portion of the coupler 15 as a connecting tool, and the inner surface of the enlarged cylindrical portion 26 communicates with the female screw portion 15A. A guide hole 27 that expands upward in a curved shape is formed, and the diameter dimension of the upper end of this guide hole 27 is formed to be equal to or greater than the diameter dimension of the duct 14, and further, in the enlarged cylindrical portion 26. , A plurality of holes 25 that communicate the guide hole 27 on the inner surface with the outer surface are formed, and through the plurality of holes 25 for filling the grout material 22 into the taper portion 14A on the outer surface side of the enlarged cylindrical portion 26. The grout material 22 is filled.

Next, the on-site assembly of the box culvert will be described. First, a non-shrinking mortar 23 is laid on the upper surface of the side wall 8 of the lower parting unit 3 to a thickness of about 10 mm, and a water-stop sponge 24 is attached by an adhesive or the like so as to surround the non-shrinking mortar 23. The coupler 15 is screwed onto the screw portion 9A, the upper division unit 2 is suspended, and the upper and lower division units 2 and 3 are butted. After abutting the upper and lower split units 2 and 3, the upper PC steel material 13 is inserted from the upper portion of the duct 17 of the upper split unit 2, and the male screw portion 13A provided at the lower end is screwed to the coupler 15. . In this case, the upper PC steel material 13 is inserted into the duct 14 by holding the upper PC steel material 13 and further axially rotated by holding the upper end side thereof to be screwed into the coupler 15. When inserted, the lower end thereof is guided to the female screw portion 15A along the guide hole 27 provided in the upper portion of the coupler 15 and can be smoothly screwed. After that, both the PC steel materials 9 and 13 are tensioned by a post tension method using a center hole jack (not shown) or the like, and the upper end of the upper PC steel material 13 is fixed by the fixing tool 18. Assemble the split box culvert 1 in which the lower split units 2 and 3 are tightly integrated. After fixing by the fixing device 18, the duct 17 is filled with the grout material 22 from the grout material injection hole 21 of the anchor plate 19. The filled grout material 22 is filled so that it flows down through the gap between the duct 17 and the upper PC steel material 13, and when it reaches the tapered portion 14A, a plurality of grout materials for punching the enlarged cylindrical portion 27 are filled. Through the hole 25, the lower portion on the outer surface side of the enlarged tubular portion 27 is quickly filled. Then, a plurality of split box culverts 1, 1 which are vertically integrated in this way are butted in the longitudinal direction, and the PC steel material 16 for lateral tightening is inserted into the duct 17 in the lateral direction by a conventional method and tensioned to integrate them. To do.

As described above, in this embodiment, the upper and lower split units 2 and 3 are formed as a pair of precast concrete members that are tensioned and integrated by the upper and lower PC steel materials 13 and 9 to form a pair. The lower PC steel material 9 which is one PC steel material is embedded in the unit 3, the duct 14 which penetrates the upper PC steel material 13 which is the other PC steel material is formed in the upper division unit 2, and the female screw portion 15A is formed in the lower PC steel material 9. One end side of the coupler 15, which is a connecting tool, is connected, the pair of upper and lower split units 2 and 3 are butted against each other, the upper PC steel material 13 is inserted from the duct 14, and the upper PC steel material 13 is connected to the other end side of the coupler 15. In a PC steel material connector of a concrete member that is screwed to connect the upper and lower PC steel materials 13 and 9, a guide hole 27 that expands toward the tip is provided at the other end of the coupler 15. When the upper PC steel material 13 is inserted from the duct 14 through the duct 14, the tip of the upper PC steel material is guided to the female screw portion 15A of the coupler 15 along the guide hole 27, and the upper PC steel material is accommodated in the coupler 15 housed at the butting point of the concrete member. 13 can be connected securely.

As an effect of this embodiment, in this embodiment, upper and lower split units 2 and 3 made of precast concrete that are tightly integrated with upper and lower PC steel materials 13 and 9 are formed. Lower PC steel material 9 is embedded in side wall 8 of No. 3, duct 14 which inserts upper PC steel material 13 is formed in side wall 12 of upper division unit 2, and female screw portion 15A is provided at the upper end of lower PC steel material 9. The coupler 15, which is a connecting tool, is connected, the upper and lower partial units 2 and 3 are butted against each other, the upper PC steel material 13 is inserted from the upper portion of the duct 14, and the lower end of the upper PC steel material 13 is screwed onto the coupler 15 so that , In the split box culvert connector for PC steel that connects the lower PC steels 13, 9, the coupler 15 is provided with the upwardly expanding guide hole 27. When 13 is inserted, the male screw portion 13A at the lower end is guided into the female screw portion 15A of the coupler 15 along the guide hole 27, and the upper and lower PC steel materials 13 and 9 can be securely connected. It is possible to improve the workability of connecting the upper and lower split units 2, 3 of the box culvert. In addition, since the plurality of holes 25 for filling the grout material 22 are formed in the enlarged cylindrical portion 26 forming the guide hole 27, the grout material 22 passes through the plurality of holes 25 and the outer surface of the enlarged cylindrical portion 27. The lower side portion is quickly filled, and the inside of the tapered portion 14A can be completely filled.

FIG. 5 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. An example is shown in which a guide hole 27 is provided by fitting a separate enlarged cylindrical portion 26A. The enlarged cylindrical portion 26A is made of elastic rubber or hard synthetic resin, and the inside of the lower end is A fitting groove 28 is formed on the top of the coupler 15 so as to be fitted on the outside. Then, the enlarged cylindrical portion 26A is externally fitted on the upper portion of the coupler 15 and attached by adhering if necessary, and the upper and lower split units 2 and 3 are butted to each other as in the first embodiment to form a duct. When the upper PC steel material 13 is inserted from the upper portion of 14, the lower end of the male screw portion 13A is guided to the female screw portion 15A of the coupler 15 along the guide hole 27.

As described above, in this embodiment, upper and lower division units 2 and 3 made of precast concrete that are tension-integrated by the upper and lower PC steel materials 13 and 9 are formed, and the side wall 8 of the lower division unit 3 is formed. A lower PC steel material 9 is buried in the upper part of the unit 2, a duct 14 for inserting the upper PC steel material 13 is formed in the side wall 12 of the upper division unit 2, and a coupler 15 having a female screw portion 15A at the upper end of the lower PC steel material 9 is a coupler. , The upper and lower divided steel units 2 and 3 are butted against each other, the upper PC steel material 13 is inserted from the upper portion of the duct 14, and the lower end of the upper PC steel material 13 is screwed into the coupler 15 to form the upper and lower PC steel materials 13 In the connector for PC steel material of the split box culvert that connects 9 and 9, since the guide hole 27 that expands upward is provided in the upper part of the coupler 15, the upper PC steel material 13 is connected from the upper part of the duct 14. Insert Then, the male screw portion 13A at the lower end thereof is guided into the female screw portion 15A of the coupler 15 along the guide hole 27, and has the same operation and effect as in the first embodiment, and in this example, Since the enlarged tubular portion 26, which is separate from the coupler 15, is fitted to the coupler 15, the coupler 15 having general versatility can be provided with the guide hole 27 simply and relatively inexpensively. Furthermore, when the enlarged tubular portion 26A is formed of an elastically deformable elastic member such as rubber, the enlarged tubular portion 26A and the upper divided unit 2 can be engaged during the butting work of the upper and lower divided units 2 and 3. Even when the and are in contact with each other, these damages or deformations can be prevented.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the guide hole 27 is not limited to one that expands in a curved shape. Instead, it may be expanded in a tapered shape. Further, in the embodiment, the example in which the coupler 15 is screwed and connected to the lower PC steel material 9 is shown, but the coupler 15 may be connected to the lower PC steel material 9 in advance by welding or the like. Further, the box culvert of the present invention can use high-strength concrete containing fiber material in concrete. Furthermore, in the embodiment, the explanation has been made by taking the case where the top plate 4 and the bottom plate 5 of each of the division units 2 and 3 are tensioned by the post tension method using the PC steel material 6 as an example. 4, a pretensioning method using a PC steel material for the bottom plate 5, that is, tension may be applied by a method of removing the tension after hardening the concrete in a state where tension is applied in the length direction of the PC steel material. Furthermore, the PC steel connector of the present invention can be applied to pillars, roofs, foundations constituting shed or keeper or mutual tension integration between them, and further through a connector housed at a butt portion of a concrete member. As long as PC steel materials forming a pair are connected, it can be used for tension integration between various concrete members.

[0016]

[Effect of device]

 The present invention forms a pair of precast concrete members that are tension-integrated by a pair of PC steel materials, in which one of the PC steel materials is embedded in the concrete member of the other, and the other concrete member of the other is formed. A duct for inserting the PC steel material is formed, one end side of a connector having a female screw portion is connected to the one PC steel material, the pair of concrete members are butted, and the other PC steel material is connected from the duct. In the PC steel material connector of the concrete member that is inserted and screwed the other PC steel material to the other end side of the connecting tool to connect the pair of PC steel materials, to the other end side of the connecting tool, Since the guide hole that expands toward the tip is provided, it is possible to provide a PC steel material connector for a concrete member that can securely connect a pair of PC steel materials. That.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 3 is a sectional view showing a first embodiment of the present invention.

FIG. 4 is a partially cutaway side view showing the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a connector according to a second embodiment of the present invention.

[Explanation of symbols]

 1 split box culvert 2 upper split unit (concrete member) 3 lower split unit (concrete member) 8, 12 side wall 9 lower PC steel 13 upper PC steel 14 duct 15 coupler (connector) 15A female screw 27 guide hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Itokawa 3-6 Higashi Bandaicho, Niigata City, Niigata Prefecture (72) Yoshihisa Murata 1-8-23 Bentenbashi Dori, Niigata City, Niigata Prefecture Nihon Samicon Co., Ltd. (72) Inventor Hiroyuki Akiyama 1-8-23 Bentenhashi-dori, Niigata City, Niigata Prefecture Nihon Samicon Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A pair of precast concrete members, which are tension-integrated by a pair of PC steel members, are formed, the one PC steel member is embedded in the one concrete member, and the other concrete member is embedded in the other concrete member. A duct through which a PC steel material is inserted is formed, one end of a connector having a female screw portion is connected to the one PC steel material, the pair of concrete members are butted, and the other PC steel material is inserted from the duct. Then, in the PC steel material connector of the concrete member for connecting the other PC steel material by screwing the other PC steel material to the other end side of the connector, the other end side of the connector is connected to the tip. A PC steel material connector for a concrete member, which is provided with a guide hole that expands toward it.