JP2008057109A - Anchoring device for tendon and anchoring method for tendon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To anchor a tension member in an already constructed structural body even when a space for rotating the tendon cannot be ensured on the outside of the structural body and the tendon has no sufficient torsional rigidity. <P>SOLUTION: This anchoring device 1 for anchoring the tendon 9 to be anchored in the structural body 8 after constructing the structural body 8 is composed of an anchoring member 2 to be buried in the structural body 8 rotatably and a pipe member 3 having such inside diameter that allows insertion of the tendon 9, connected with the anchoring member 2 at one end, exposed on a surface of the structural body 8 at the other end, and arranged in the structural body 8 to rotate together with the anchoring member 2. By rotating the pipe member 3, the anchoring member 2 is rotated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention mainly relates to a tension device fixing device and a tension material fixing method used for fixing a tension material in a constructed structure.

  For example, when a tension member is fixed in a built structure, the tension member is attached to a fixing member such as a nut embedded in the structure in advance through an insertion hole formed in the structure from the surface to the fixing member. Inserting and connecting the tendon to the fixing member is performed (see Patent Document 1).

  In this case, since the tension member is connected to the fixing member on the outside of the structure, the thread portion formed at the tip of the tension member is turned by rotating the tension member as shown in FIG. It is screwed to the fixing member (see Patent Documents 1 and 2). FIG. 5 shows FIG. 5 of Patent Document 2.

JP 7-048929 A (Claim 1, paragraph 0012, FIG. 1, FIG. 2) JP 2003-313816 A (Claim 1, paragraphs 0028 to 0031, FIG. 5)

  However, rotating the tendon and screwing the tip of the tendon into the fixing member is outside the structure as in the case where the length of the tendon remains somewhat longer than the length of the insertion hole. This is limited to a case where a space enough to rotate the tendon is secured. It is also a condition that the tendon itself has torsional rigidity that can transmit a rotational force to the tip of the tendon by a rotating operation outside the structure.

  Therefore, if these conditions are not met, the tension material cannot be rotated outside the structure and fixed on the fixing member to be fixed inside the structure.

  Along with the fixing member, a sleeve (crimp grip) that is screwed to the fixing member is disposed in advance in the sheath, so that the tension member can be connected to the fixing member without rotating the tension member to be inserted later. Although it is considered possible, the work for joining the tendon to the sleeve is accompanied by the filling of the grout, which complicates the field work and increases the cost.

  From the above background, the present invention makes it possible to fix a tension material even when a space sufficient to rotate the tension material is not secured outside the structure or when the tension material does not have sufficient torsional rigidity. A tendon fixing device and a tendon fixing method are proposed.

  The fixing device for a tendon according to claim 1 is a fixing device for fixing a tendon to be fixed in a structure after the construction of the structure, and is embedded in the structure in a rotatable state. The fixing member has an inner diameter through which the tendon can be inserted, is connected to the fixing member at one end, is exposed to the surface of the structure at the other end, and is rotatable with the fixing member in the structure. And the fixing member is rotatable with the rotation of the tube material. The fixing member and the tube material are embedded in the structure so as to be rotatable around the axis of the tendon material.

  The tube material that is exposed on the surface of the structure and through which the tension material can be inserted can be rotated together with the fixing member in the structure, so that the tip of the tension material can be rotated by rotating the tube material without rotating the tension material directly. It is possible to screw the fixing member into the screw. For this reason, there is no restriction on the length of the tendon, and the tendon is fixed even when there is not enough space to rotate the tendon outside the structure, or when the tendon is not twisted and rigid. It can be screwed onto the member.

  Since there is no restriction on the length of the tendon, even if the span of the tendon spans several meters to several tens of meters, it is possible to fix one end of the tendon by rotating the pipe outside the structure. Therefore, it can be applied to seismic reinforcement for existing structures as well as new construction in civil structures such as bridges and building structures such as buildings.

  Specifically, as described in claim 2, the fixing member is surrounded and insulated from the structure by a support member embedded and fixed in the structure and a cover member fixed to the support member. By being placed in a closed state, it is embedded in the structure in a rotatable state.

  The insertion hole between the surface of the structure and the fixing member is ensured by connecting a sheath surrounding the tube material to the pressure bearing member as described in claim 3. The sheath surrounds the entire length of the pipe material, and becomes a formwork when placing or filling a filler such as concrete or mortar constituting the structure, and prevents the filler from entering the inside of the sheath.

  The tension material is fixed by inserting the tension material into an insertion hole formed continuously from the fixing member embedded in a rotatable state in the structure as described in claim 4 to the surface of the structure, The fixing member is rotated while the tension member is opposed to the fixing member, and the fixing member is screwed to the tension member to connect them. Specifically, the fixing member is connected to the fixing member, and the fixing member is screwed to the tension member by rotating the tube exposed on the surface of the structure and rotating the fixing member. .

  Although the tendon fixing method according to claims 4 and 5 is mainly performed using the tendon fixing device according to any one of claims 1 to 3, it is not always necessary, and any means is used. If the fixing member can be embedded in the structure in a rotatable state, it is carried out. The method of claim 5 is carried out if the fixing member and the tube material can be embedded in a rotatable state in the structure by any means.

  According to the first aspect of the present invention, the tube member that is exposed on the surface of the structure and through which the tension material can be inserted is rotatable together with the fixing member in the structure, so that the fixing member is screwed to the tip of the tension material by rotating the tube material Can be made. Therefore, there is no restriction on the length of the tendon, so even when there is no space outside the structure or when the tendon does not have torsional rigidity, the tendon is screwed onto the fixing member and connected. Can do.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  1 has a fixing member 2 embedded in a rotatable state in a structure 8 and an inner diameter through which a tensioning material 9 can be inserted, and is connected to the fixing member 2 at one end and the surface of the structure 8 at the other end. A specific example of a tensioning material fixing device (hereinafter referred to as a fixing device) 1 including a pipe member 3 that is exposed to the tube member 3 and is disposed in the structure 8 so as to be rotatable together with the fixing member 2 is shown. In the structure 8, an insertion hole 81 is continuously formed from the fixing member 2 embedded in a rotatable state to the surface of the structure 8.

  The structure 8 is constructed from steel reinforced concrete, reinforced concrete, or concrete or mortar mixed with fibers. The fixing device 1 is applied to all structures having a portion for fixing the tension member 9 in the constructed structure 8, and as shown in FIG. 3, in addition to the tension member as an earthquake-resistant reinforcing material for a building structure, the bridge It is used to fix tension members for preventing falling bridges and cable cables for cable-stayed bridges. It does not matter whether the structure 8 is an existing structure or a new structure.

  The fixing member 2 is joined to the tube material 3, and rotates together with the tube material 3 by rotating the tube material 3 about its axis. The tube material 3 is rotated by applying a rotational force from a portion protruding from the structure 8, and rotates the fixing member 2. In order to rotate the fixing member 2, the pipe member 3 only needs to have sufficient rigidity to transmit the torsional moment given from the portion protruding from the structure 8 to the fixing member 2. The pipe member 3 mainly includes a steel pipe or a synthetic resin. Tube is used. The method of joining the fixing member 2 and the pipe material 3 is arbitrary, but in the drawing, for example, a flange 3a is formed at the tip of the pipe material 3, the flange 3a is butted against the fixing member 2, and the bolt 31 is passed through, or They are joined by welding.

  The pipe member 3 is gripped by a tool or jig for applying rotation at a portion protruding from the structure 8, or is locked by the tool or jig and rotated around the axis by the tool or the like. The bonded fixing member 2 is rotated. In the drawing, an operation hole 3b for inserting a tool is formed in a projecting portion of the tube material 3 from the structure 8, and the tube material 3 is rotated using the operation hole 3b. The operation hole 3b is formed at one place or a plurality of places.

  A sheath 4 for protecting the tubular material 3 from a material having fluidity at the time of constructing the structural body 8 is disposed around the tubular material 3, and a distal end of the sheath 4 is fixed to the structural body 8. 5 is connected. The supporting member 5 is embedded in the structure 8 so that the sheath 4 is fixed in the structure 8, and the fixing member 2 bears a tensile force that the fixing member 2 receives from the tension material 9 and uses the force as a supporting pressure. 8 is transmitted. The insertion hole 81 of the structure 8 is formed by embedding the sheath 4.

  A cover member 6 that insulates the fixing member 2 from the structure 8 is fixed to the supporting member 5 on the fixing member 2 side. The cover material 6 is not limited as long as it can block the inside from the outside without hindering the rotation of the fixing member 2 disposed therein, and the form of the cover material 6 itself and the connection method of the bearing member 5 are not limited.

  In the drawing, the cover member 6 is constituted by a side plate 6a positioned around the fixing member 2 and an end plate 6b abutted against one end of the side plate 6a, and passes through the end plate 6b or the end plate 6b and the side plate 6a. The member 5 is joined to the supporting member 5 by a screw 7 such as a bolt that reaches the member 5. Moreover, in order to ensure the watertightness between the cover member 6 and the support member 5, a seal member 6c such as packing is interposed in the circumferential direction at the end of the side plate 6a on the support member 5 side. . In addition, the cover member 6 may be composed of a side plate 6a with a flange and an end plate 6b that is butted against or bonded to the side plate 6a, and the side plate 6a may be joined to the supporting member 5 with a screw or the like at the flange.

  The fixing member 2 is held in a state in which it can rotate between the supporting member 5 inside the cover member 6. The fixing member 2 may be held in any manner, but in the drawing, the tube material 3 is supported on the inner periphery of the insertion hole 5a of the bearing member 5, that is, the tube material 3 is locked downward on the inner periphery of the insertion hole 5a. Thus, the fixing member 2 is kept floating inside the cover member 6 and is held in a rotatable state.

  Since the tension member 9 is screwed into the fixing member 2, a member such as a nut having a female screw cut in the insertion hole 2a is used. When a member having a large bending rigidity such as a PC steel bar or a steel bar is used as the tension member 9, a male screw is formed directly on the end of the tension member 9, and the male screw is directly formed in the insertion hole 2 a of the fixing member 2. Screwed together.

  When a member such as a reinforcing bar, PC strand, or fiber reinforced material that cannot be expected to have bending rigidity is used as the tension member 9, a crimping grip, a sleeve, or the like having a male screw portion 10a formed at the tip on the fixing member 2 side as shown The joint member 10 is integrated. The joint member 10 is mounted around the tendon 9 and is integrated with the tendon 9 by being crimped or by filling the gap with grout.

  In the structure 8, a sheath 4 in which the bearing member 5 and the cover material 6 are integrated and a pipe material 3 in which the fixing member 2 are integrated are arranged before the construction. Among them, the material such as concrete constituting the structural body 8 is placed or filled in such a manner that the bearing member 5, the cover material 6 and the sheath 4 are buried in the structural body 8, and the structural body 8 is constructed. Is done. The fixing member 2 is surrounded by the support member 5 and the cover material 6, and the tube material 3 is surrounded by the sheath 4, and both are rotatable around the axis of the tube material 3.

  As shown in FIG. 1, the tension member 9 is inserted from the end of the pipe member 3 and is inserted until the tip or the tip of the joint member 10 hits the insertion hole 2 a of the fixing member 2. At this time, the tendon 9 need only be inserted in the axial direction and does not need to be rotated around the axis. When the distal end of the tension member 9 or the distal end of the joint member 10 hits the insertion hole 2a, the tube member 3 is rotated about the axis.

  When the tube 3 is rotated about the axis, the fixing member 2 rotates and is screwed into the tension member 9 or the male thread portion 10a of the joint member 10. The fixing member 2 is in a rotatable state inside the cover member 6. For example, the spacer 3 is disposed on both sides in the axial direction of the fixing member 2, so that the pipe member 3 is interposed between the pressure supporting member 5 and the cover member 6. It may be left in a state where it does not move in the axial direction. In that case, it is possible to feed the tension member 9 to the fixing member 2 side only by rotating the pipe member 3, and to fasten the fixing member 2 to the tension member 9 or the male screw portion 10 a of the joint member 10.

  The tension force is introduced into the tension member 9 by tightening the other fixing end of the tension member 9 after the fixing member 2 or the male member 10a of the joint member 10 is screwed into the fixing member 2 or tightened. Then, the other fixing end of the tension member 9 is fixed to the fixing member as it is, thereby completing the installation of the tension member 9. After the construction of the tension material 9 is completed, the sheath 4 and the tube material 3 are filled with grout to protect the tension material 9. The grout is filled up to the inside of the cover material 6, and the fixing member 2 is also protected.

  FIG. 3 shows an example of the case where the tension material 9 is used as a tensile brace for seismic reinforcement of an existing building. In this example, the lower end of the tension material 9 is fixed to, for example, the ground or the foundation constructed on the ground, and the upper end is fixed to the pillar or beam of the existing building, or the fixing part 11 protruding from them. The basis here corresponds to the structure 8 in the present invention.

  When the tension material 9 is used as a tension brace, the tension material 9 is laid between, for example, a lower floor column, beam, or foundation and an upper floor column, beam, or the like. The work is performed by once raising the tension material 9 to the upper floor and then sending the tip portion fixed on the lower floor to the lower floor from the upper floor. In the state in which the tension material 9 is installed between the upper floor and the lower floor, the tension material 9 cannot be rotated because the length and mass of the tension material 9 are large.

  Therefore, the tension member 9 is placed between the upper floor and the lower floor, and the pipe member 3 is rotated while the distal end of the tension member 9 or the male screw portion 10a at the distal end of the joint member 10 is opposed to the fixing member 2. Accordingly, the fixing member 2 is rotated and screwed into the male screw 10a. By fixing the fixing member 2 to the male screw 10a, fixing of one end (lower end) of the tension member 9 is completed. In FIG. 3, the structure 8 (foundation) in which the lower end of the tendon material 9 is fixed is buried in the ground.

  The other end (upper end) of the tension member 9 is fixed to the fixing unit 11 with a nut or a wedge after the tension member 9 is tensioned on the upper floor. In FIG. 3, the upper end of the tension member 9 passes through the column 12 and is fixed to the fixing unit 11 formed on the opposite side of the tension member 9 with respect to the column 12.

  FIG. 4 shows that the insertion hole 2a of the fixing member 2 is temporarily exposed to the outside air when it takes time (period) to connect the tension member 9 to the fixing member 2 after the structure 8 is constructed. In order to protect against the occurrence of rust caused by this, the protective male screw member 13 is screwed into the insertion hole 2a.

  In FIG. 4, the end face of the pipe member 3 protruding to the outside of the structure 8 is also closed by the closing plate 14. The closing plate 14 is, for example, a male screw member for protection in a state in which the screw portion formed at the end portion of the male screw member 13 for protection on the side of the closing plate 14 is penetrated and a nut is screwed into the threaded portion. 13 is joined.

It is sectional drawing which showed a mode that it was going to connect a tension material with respect to the fixing member of a fixing device. It is an end view of the AA line of FIG. It is the perspective view which showed a mode that the tension material connected with a fixing device was used as a brace for earthquake resistance reinforcement of the existing building. FIG. 6 is a cross-sectional view illustrating a state where a protective male screw member is screwed into a fixing member of the fixing device. It is sectional drawing which showed the mode at the time of the connection of the tendon to the conventional fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Fixing device 2 ......... Fixing member 2a ...... Insertion hole 3 ......... Pipe material 3a ...... Flange 3b ...... Operating hole 31 ... Bolt 4 ......... Sheath 5 ......... Supporting member 5a ...... Insertion hole 6 ... Cover material 6a ... Side plate 6b ... End plate 6c ... Seal material 7 ... Screw 8 ......... Structure 81 ... Insertion hole 9 ...... Tensile material 10 ... Joint member 10a ... Male thread part 11 ... Fixing part 12 ... Pillar 13 ... Male thread member for protection 14 ... Closure plate

Claims (5)

  A fixing device for fixing a tension material to be fixed in a structure after the structure is constructed, and a fixing member embedded in a rotatable state in the structure, and the tension material can be inserted therethrough A pipe member having an inner diameter, connected to the fixing member at one end, exposed to the surface of the structure at the other end, and arranged in the structure in a rotatable state together with the fixing member. The tension member fixing device is characterized in that the fixing member is rotatable in accordance with rotation of the tension member.   The fixing member is surrounded by and insulated from the structure by a supporting member embedded and fixed in the structure and a cover member fixed to the supporting member. The tendon fixing device according to claim 1, which is embedded.   The tension member fixing device according to claim 2, wherein a sheath that surrounds the tube material is connected to the support member.   Inserting a tendon into a through-hole formed continuously from the fixing member embedded in a rotatable state in the structure to the surface of the structure, with the tendon facing the fixing member, A tensioning material fixing method, comprising: rotating the fixing member; screwing the fixing member into the tensioning material; and connecting the two. The tension member fixing method according to claim 4, wherein a pipe member exposed on a surface of the structure is connected to the fixing member, and the fixing member is rotated by rotating the pipe member.

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