JP2005264463A - Method for filling grout material and cap for tendon fixture used for its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for filling a grout material capable of completely coating the end section of a tendon with the grout material without leaking the grout material and a cap for a tendon fixture capable of realizing such a filling method. <P>SOLUTION: A projecting section from the concrete material of the tendon (2) inserted into a sheath pipe (1) penetrating the concrete material (3) is fixed onto the surface of the concrete material by the fixture (10). The cap (13) with an air suction port (4) is fitted tightly to the fixture. The grout material is pressed into the cap, the fixture and the sheathed pipe from a filler port (5) while keeping these insides of the cap, the fixture and the sheathed pipe at a negative pressure by evacuation from the suction port. The cap (13) used in this case has an opening (16) receiving the projecting section together with the fixture, the suction port, a peripheral wall (15) having a flexibility and an outside diameter expanded towards the opening and an annular member (14) for a clamping loosely fitted to the peripheral wall. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for filling a grout material into a sheath tube through which a tension material such as a PC steel wire is inserted, and a cap for a tension material fixture used in the method.

  As a method of connecting PC members installed side by side, a method of inserting a steel wire as a tension member through a sheath tube penetrating the PC member is generally known. In this method, the tension member passed through the sheath tube is fixed by the grout material press-fitted into the sheath tube in a pulled state, so that the PC members can be connected while being compressed.

  However, there are some problems in the work of pressing the grout material while pulling the tendon material. For example, the end of the tendon material is first fixed on the surface of the PC member via a fixing tool prior to the press-fitting of the grout material. It was. Japanese Patent Application Laid-Open No. 11-209922 proposes a liquid leakage prevention cap as a means for solving such a problem.

The liquid leakage prevention cap is composed of a bottomed cylindrical cap member that covers the end of the tendon and its end fixture, and a fixing ring member that is fitted to the outside of the opening side end of the cap member. Is. Then, by moving the fixing ring member to the opening side of the cap member and pressing the cap member in the diameter reducing direction, the cap member is fixed to the fixture, and leakage of the grout material from the gap of the fixture is prevented. It has become. In addition, as a fixing tool, what consists of a split cylindrical-shaped clamping member and the cylinder member in which this clamping member is inserted is known, This liquid leakage prevention cap respond | corresponds to such a well-known fixing tool. It has a shape.
JP-A-11-209922

  However, there are other problems in the grout material press-fitting work, and there are some that cannot be solved by the above-described liquid leakage prevention cap.

  That is, air exists in the sheath tube or the fixture, but according to the filling method using the liquid leakage prevention cap, the air remains at the end of the cap. However, there was a problem that it was not completely covered with the grout material.

  Accordingly, an object of the present invention is to provide a grout material filling method capable of completely covering the end of the tendon material with the grout material without leaking the grout material, and such a filling method. It is in providing the cap for tension material fixing tools.

  In the filling method according to the present invention, first, a protruding portion from the concrete material of a tension material inserted through a sheath tube penetrating the concrete material is fixed on the surface of the concrete material with a fixture. Next, a cap having an intake port is closely fitted to the fixture. Then, a grout material is press-fitted into the cap, the fixture, and the sheath tube from the inlet while keeping the inside thereof at a negative pressure by evacuation from the inlet.

  A cap for a tension material fixture according to the present invention includes an opening for receiving a protruding portion of a tension material from a concrete material together with a fixture for fixing the tension material, an intake port, a flexible outer A peripheral wall having a diameter expanding toward the opening and an annular fastening member loosely fitted on the peripheral wall.

  The fastening member may be screwed onto the peripheral wall.

  The tightening member may have a regular polygonal outline in plan view with the opening surface of the through hole as the top surface or the bottom surface.

  The fastening member may include a protrusion on the outer peripheral surface parallel to the axis of the through hole.

  According to the filling method of the present invention, a cap equipped with an intake port is tightly fitted to a fixture, and the grout material is press-fitted while maintaining a negative pressure inside the cap by extracting air from the intake port. The grout material can be filled in the gap in the fixture and the inside of the cap. The tendon can then be completely covered with the grout material. Moreover, since the protruding portion of the tendon is air-tightly covered with the cap, there is no possibility that the grout material leaks.

According to the cap for the tension member fixing device according to the present invention, the protruding member from the concrete material of the fixed tension member and the fastening member is moved to the opening side in a state of covering the fixing member. It is possible to bend the peripheral wall whose diameter is expanded toward the fixing tool and to bring it into close contact with the fixture. Further, in this state, if the air is extracted from the intake port, the inside thereof and the inside of the fixture covered with the cap can be set to a negative pressure.
Therefore, the cap for the tension member fixing tool can be tightly fitted to the tension member fixing member, and the inside thereof can be kept at a negative pressure together with the inside of the fixing member by using the intake port. It can be used suitably for the filling method.

In the tension member fixing tool cap according to the present invention, if the fastening member is screwed onto the peripheral wall, the adhesion force to the fixing tool can be adjusted by the magnitude of the rotation angle of the fastening member. Therefore, it becomes possible to always obtain a constant contact force regardless of the skill of the worker, and the intake state can be stabilized.
Further, by rotating the fastening member in the reverse direction, it is possible to remove it once attached to the fixture. And when concrete placement which a tension material protrusion part and a fixing tool are buried is carried out, it does not remain inside the placed concrete by removing the tension material after hardening with a grout material. Therefore, even if the cap is made of resin, it is possible to prevent the occurrence of problems such as cracks caused by the resin being embedded in the concrete.

  Furthermore, if the tightening member has a regular polygonal shape in which the opening surface of the through hole is the top surface or the bottom surface, the tightening operation or the loosening operation can be easily performed with a spanner or the like.

  Furthermore, if a protrusion is provided on the outer peripheral surface of the tightening member parallel to the axis of the through hole, the tightening operation or the loosening operation can be easily performed with a tool that engages the protrusion.

  A specific example of the filling method according to the present invention will be described with reference to FIGS. FIG. 1 shows a state in which a tendon is fixed with a fixture, (a) is a front sectional view of the whole, and (b) is a front sectional view showing an enlarged fitting portion between a fastening member and a peripheral wall. . FIG. 2 is a plan view of the same state.

  First, as shown in FIGS. 1 and 2, the protruding portion from the concrete material 3 of the tension material 2 inserted through the sheath tube 1 penetrating the concrete material 3 is fixed on the surface of the concrete material 3 with a fixture 10. . In addition, as the fixture 10, a known member is used in which the clamping member 11 having a split cylindrical shape and the cylindrical member 12 arranged in close contact with the outer surface cooperate to fix the tension member 2.

  When the tension member 2 is fixed, the cylindrical member 12 is installed on the surface of the concrete material 3. In FIG. 1, an anchor plate 25 is provided at the installation position of the cylindrical member 12, that is, at the opening of the sheath tube 1. Yes. Further, the anchor plate 25 is provided with a grout inlet 5 that communicates with the sheath tube 1.

Once the tendon 2 is fixed, the cap 13 having the intake port 4 is then tightly fitted to the fixture 10.
Then, the grout material is press-fitted into the cap 13, the fixture 10 and the sheath tube 1 from the inlet 5 while keeping the inside of the cap 13, the fixture 10 and the sheath tube 1 at a negative pressure by venting from the inlet 4.

  According to this filling method, it is possible to fill the gap in the fixture 10 and the cap 13 with the grout material. The tendon 2 can be completely covered with the grout material. And since the protrusion part of the tension material 2 is coat | covered airtight with the cap 13, there is also no possibility that a grout material may leak.

  The cap 13 is a specific example of the cap for the tension material fixture according to the present invention, and includes an opening 16 for receiving the protruding portion of the tension material 2 from the concrete material 3 together with the fixture 10, an intake port 4, and flexibility. And a peripheral wall 15 having an outer diameter expanding toward the opening 16 and an annular fastening member 14 loosely fitted to the peripheral wall 15.

  According to the cap 13, the fastening member 14 is moved to the opening 16 side in a state where it is covered with the protruding portion of the fixed tension material 2 from the concrete material 3 and the fixing tool 10, so that the opening 16 is moved to the opening 16. The peripheral wall 15 whose diameter is expanded toward the fixing tool 10 can be bent and bent. Further, in this state, if the air is extracted from the intake port 4, the inside thereof and the inside of the fixture 10 covered by the cap 13 can be made negative pressure. In FIG. 1, the intake port 4 has a known two-pull screwed into a mounting hole 17 formed in the bottom of the cap 13.

As shown in FIG. 1B, corresponding threads are provided on the outer surface of the peripheral wall 15 and the inner surface of the through hole 18 of the fastening member 14. The fastening member 14 is screwed into the peripheral wall 15. In addition, since the cross-sectional size of a screw is small compared with the whole and cannot be clearly displayed in contrast with the whole fixture, the screw is omitted in FIG.
If it carries out like this, the contact | adhesion power with respect to the cylinder member 12 of the cap 13 can be adjusted with the magnitude | size of the rotation angle of the member 14 for clamping. Therefore, it becomes possible to always obtain a constant contact force regardless of the skill of the worker, and the intake state can be stabilized.
In addition, by rotating the fastening member 14 in the reverse direction, it is possible to remove the fastening member 14 once attached to the tubular member 12. And when concrete placement that the tension material 2 and the fixture 10 are buried is carried out, the tension material 2 is not left in the placed concrete by removing it after hardening with the grout material. . Therefore, even if the cap 13 is made of resin, it is possible to prevent the occurrence of problems such as cracks caused by the resin being embedded in the concrete.

The tightening member 14 has a regular hexagonal outline in plan view with the opening surfaces 19a, 19b of the through-hole 18 as the top surface or the bottom surface.
Thus, the tightening operation or the loosening operation can be easily performed with a spanner or the like.

The contour of the tightening member may be another regular polygon, or may be provided with a protruding portion as shown in FIG. 3A and 3B show another specific example of the fastening member, in which FIG. 3A is a plan view showing a state in which a tendon is fixed, and FIG. In FIG. 3, parts that are substantially the same as those in the specific example are given the same reference numerals, and explanations thereof are omitted.
The fastening member 20 shown in FIG. 3 includes a protrusion 22 on the outer peripheral surface 21 parallel to the axis X of the through hole 18.
In this way, the tightening operation or the loosening operation can be easily performed with a tool that engages with the protrusion 22.

The specific example of the cap for tension material fixing tools concerning this invention is shown, (a) is front sectional drawing of the whole state to which the tension material was fixed, (b) is the fitting part of the fastening member and peripheral wall in the same state It is a front sectional view which expands and shows. It is a top view of the same state. The other specific example of the member for fastening is shown, (a) is a top view in the state where the tendon end part was fixed, and (b) is a simple substance front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheath pipe 2 Tension material 3 Concrete material 4 Inlet port 5 Inlet 10 Fixing device 13 Cap 14, 20 Tightening member 15 Perimeter wall 16 Opening 18 Through-holes 19a, 19b Opening surface 21 Outer peripheral surface 22 Projection

Claims (5)

A protruding part from the concrete material (3) of the tension material (2) inserted through the sheath tube (1) penetrating the concrete material (3) is fixed on the surface of the concrete material (3) (10). Fixed with
A cap (13) having an intake port (4) is tightly fitted to the fixture (10),
Grouting material is introduced into the cap (13), the fixture (10), and the sheath tube (1) from the inlet (5), and the inside of these is brought to negative pressure by evacuation from the intake port (4). A filling method characterized by press-fitting while maintaining.   An opening (16) for receiving the projecting portion of the tendon (2) from the concrete material (3) together with a fixture (10) fixing the tendon (2), an intake port (4), and a flexible And a peripheral wall (15) whose outer diameter increases toward the opening (16), and an annular fastening member (14 or 20) loosely fitted to the peripheral wall (15). A cap (13) for a tendon fixture characterized by.   The tension member fixing cap (13) according to claim 2, wherein the fastening member (14 or 20) is screwed into the peripheral wall (15).   The tension member according to claim 3, wherein the fastening member (14) has a regular polygonal outline in plan view with the opening surface (19a, 19b) of the through hole (18) as the top surface or the bottom surface. Fixing cap (13). The tension member fixing device according to claim 3, wherein the fastening member (20) includes a protrusion (22) on an outer peripheral surface (21) parallel to the axis (X) of the through hole (18). Cap (13).

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