JP2015078490A - Method of confirming filling state of filler filling joint part of pc member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the filling state of a filler on a surface-directional inner side of a joint part between mutually joined PC members.SOLUTION: A plurality of substantially L-shaped coated electric wires 12 are fixed along a joint surface and a side face of an upper column member 4 and a joint surface and a side face of a joint member 1, and the upper column member 4 and joint member 1 are moved to put the joint surfaces closer to each other, so that a filled space is formed between the joint surfaces. After the filled space is filled with grout GR which has electric conductivity in a fluid state, the resistance value (electric characteristics) between one coated electric wire 12 and another coated electric wire 12 is measured by a measuring instrument 13.

Description

  The present invention relates to a method for checking a filling state of a filler filled in a joint portion of a PC (precast concrete) member.

  A frame-type structure using a PC member is known (see, for example, Patent Document 1). In this frame structure, joints (for example, a joint portion between a PC column member and a PC joint member, a joint portion between a PC beam member and a PC joint member, a joint portion between PC column members, and a joint portion between PC beam members) It is filled with a filler such as grout.

  When filling the filler, it is difficult to visually check the filling state from the outside of the joint. For this reason, conventionally, a large amount of filler is filled in the filling space, while excess filler is discharged from the filling space, and the completion of filling is determined based on the fact that no bubbles are contained in the discharged filling material. ing. This method has a problem that the filler is consumed wastefully.

  As a method for detecting the filling state of the filler from the outside, Patent Document 2 discloses that a water-soluble insulating sheet to which electrodes and lead wires are attached is arranged in a concrete mold and the electrodes are connected by the placed concrete. Is described as a method of detecting the resistance with an ohmmeter or LED. In Patent Document 3, a resistance circuit in which high resistance elements are connected in series is fixed in a formwork, and the filling situation is recognized from the outside based on the current of the resistance circuit that changes as the concrete is placed. How to do is described.

Japanese Patent No. 3837390 Japanese Patent No. 2744400 Japanese Patent No. 2740438

  In order to suppress wasteful consumption of the filler, it is conceivable to apply the techniques described in Patent Documents 2 and 3 to the filling confirmation in the joint portion between the PC members. However, in these techniques, since the electrodes and the resistance circuit are fixed to the mold, it is difficult to check the filling state on the inner side in the surface direction at the joint.

  This invention is made | formed in view of such a situation, The objective is to confirm the filling condition of the filler about the inner side of a surface direction regarding the joint part between PC members.

  In order to achieve the above object, the present invention provides a filling state confirmation method for confirming a filling state of a filler to be filled in joints of a first PC member and a second PC member, the bonding surface of the first PC member and the first PC member A wire fixing step of fixing the plurality of covered wires to the PC member on the bonding surface side, and a bonding surface of the first PC member and the A PC member moving step in which at least one of the first PC member and the second PC member is moved so that a bonding surface of the second PC member comes close to each other, and a filling space is formed between the bonding surfaces; A characteristic measuring step of measuring an electrical characteristic between a certain covered electric wire and another covered electric wire is performed after the filling material having conductivity in a state is filled in the filling space.

  According to the present invention, a plurality of covered electric wires whose one ends are arranged on the joint surface of a PC member are fixed to the PC member, and electrical characteristics between one covered electric wire and another covered electric wire are measured. . Since the filler has conductivity, the electrical characteristics differ between when the filler is filled up to the end of the covered electric wire and when it is not filled. Therefore, the filling state of the filler can be confirmed based on the electrical characteristics. Here, since one end of the covered electric wire is arranged on the joint surface, the filling state of the filler can be confirmed on the inner side in the surface direction of the joint portion.

  In the above-described filling status confirmation method, a reinforcing bar is installed between the first PC member and the second PC member, and in the wire fixing step, one end of the covered wire is connected to the filling material injection position or discharge. It is preferable to arrange in the range which is obstructed by the reinforcing bars when viewed from the position. In this method, it is possible to check the filling state of a portion where the filler near the reinforcing bar is particularly difficult to be filled.

  In the above-described filling state confirmation method, it is preferable that the removing step of removing the plurality of covered electric wires is performed after the characteristic measuring step before the filler filled in the filling space is cured. In this method, the filling state of the filler can be confirmed without leaving the covered electric wire in the joint.

  In the above-described filling status confirmation method, the first PC member is disposed above the second PC member, and in the electric wire fixing step, one end of the conductive coated electric wire is placed on the joining surface located at the lower end of the first PC member. It is preferable to fix the said covered electric wire so that it may be arrange | positioned. In this case, it is more preferable that the first PC member and the second PC member are either a column member or a joint member. In this method, one end of the covered electric wire is arranged on the joint surface of the first PC member, that is, the upper surface in the filling space of the filler. Since air tends to remain on the upper surface of the filling space, it is possible to check the filling state of a portion that is difficult to be filled with the filler.

  According to the present invention, with respect to the joint portion between the PC members to be joined together, the filling state of the filler can be confirmed on the inner side in the surface direction of the joint portion.

It is the perspective view and sectional drawing explaining the junction part of precast concrete. It is a figure explaining the filling condition of the filler in a lower joint part. It is a figure explaining the state which fixed the some covered electric wire to the upper pillar member. It is a figure which illustrates arrangement of a covered electric wire typically. It is a figure explaining the state which fixed the some covered electric wire to the joint member. It is a figure explaining the mode in the middle of moving the upper pillar member. It is a figure explaining the filling operation | work of mortar (filler). It is a figure explaining removal of a covered electric wire.

  Hereinafter, embodiments of the present invention will be described. First, the joint portion of the PC member (precast concrete member) will be described. FIG. 1A is a perspective view showing a beam-to-column joint portion, which is a frame structure using a PC member, and FIG. 1B is a cross-sectional view of the beam-to-column joint portion.

  As shown in FIG. 1A, in this embodiment, as a PC member, a joint member 1, a left beam member 2, a right beam member 3, an upper column member 4, and a lower column member 5 are exemplified. doing. The left beam member 2 is joined to the left side surface of the joint member 1, and the right beam member 3 is joined to the right side surface of the joint member 1. The upper column member 4 is joined to the upper surface of the joint member 1, and the lower column member 5 is joined to the lower surface of the joint member 1.

  In this embodiment, between the upper column member 4 and the joint member 1, the upper column member 4 corresponds to the first PC member, and the joint member 1 corresponds to the second PC member. Further, between the joint member 1 and the lower column member 5, the joint member 1 corresponds to the first PC member, and the lower column member 5 corresponds to the second PC member.

  As shown in FIG. 1B, a plurality of reinforcing bars 6 project downward from the lower surface of the upper column member 4. As can be seen from FIG. 2, these reinforcing bars 6 are arranged in a substantially square shape in plan view. In the present embodiment, the upper column member 4 and the lower column member 5 have the same outer dimensions, and are aligned in the plane direction. For this reason, each reinforcing bar 6 is arranged at a position slightly inside the surface direction from the outer peripheral edge of the upper column member 4.

  As shown in FIG. 1 (b), when connecting the upper column member 4 and the lower column member 5, a plurality of reinforcing bars 6 projecting downward from the lower surface of the upper column member 4 are connected to the joint member 1. The plurality of reinforcing bar through holes 7 are inserted. At the same time, the lower portion of the reinforcing bar 6 protruding downward from the lower surface of the joint member 1 is inserted into the reinforcing bar joint 8 provided on the upper surface of the lower column member 5. Thereby, the reinforcing bar 6 is constructed between the upper column member 4, the joint member 1, and the lower column member 5. At that time, a slight space is formed between the lower surface of the upper column member 4 and the upper surface of the joint member 1 and between the upper surface of the lower column member 5 and the lower surface of the joint member 1. These spaces become filling spaces filled with grout GR.

  Here, the grout GR injection path 9 is provided in the lower column member 5, and the grout GR discharge path 10 is provided in the upper column member 4. When the grout GR is injected from the injection path 9, the lower filling space is filled with the grout GR and becomes the lower joint portion 11L. Further, the grout GR is filled in the reinforcing bar joint portion 8 while ascending the reinforcing bar through hole 7 and flows into the upper filling space. By filling the upper filling space with the grout GR, the upper joint portion 11U is formed. Then, excess grout GR is discharged from the discharge path 10.

  As described above, the grout GR is filled through the injection path 9. As shown in FIG. 2, the upper end of the injection path 9 corresponds to the injection position of the grout GR, and communicates with the vicinity of the center of the lower column member 5 in the surface direction. For this reason, in the lower filling space, the grout GR flows from the outlet of the injection path 9 to the outer side in the surface direction and flows into the reinforcing bar joint portion 8 and the reinforcing bar through hole 7. In this case, the grout GR stagnates around the rebar 6, particularly on the side opposite to the upper end of the injection path 9, and the bubbles AR tend to remain.

  Conventionally, bubbles AR were eliminated by pouring a sufficient amount of grout GR, but there was a problem that the amount of grout GR injected was excessive and wasted. In this embodiment, paying attention to the fact that the grout GR in a fluid state has conductivity, the covered electric wires 12 (see FIG. 3 and the like) are arranged at positions where the bubbles AR are likely to remain, It is determined whether or not the grout GR is filled by measuring the electrical characteristics (for example, resistance value) between them. Hereinafter, the confirmation method of this filling condition is demonstrated with the joining procedure of PC member.

  When joining PC members, a plurality of covered electric wires 12 are fixed to a PC member to be joined (wire fixing step).

  For example, as shown to Fig.3 (a), with respect to the upper column member 4, the some covered electric wire 12 is fixed in the state spaced apart in the outer peripheral direction. These covered electric wires 12 are bent in a substantially L shape, and the bent portion is positioned at the lower end periphery of the upper column member 4 and extends inward and upward in the surface direction from the bent portion. That is, the lower end portion of the covered electric wire 12 is arranged on the inner side in the surface direction from the lower end periphery along the joining surface defined at the lower end of the upper column member 4. Further, the portion above the bent portion of the covered electric wire 12 is disposed along the side surface of the upper column member 4. Since the covered electric wires 12 are temporarily fixed, each covered electric wire 12 is temporarily fixed (removably fixed) to the upper column member 4 with an adhesive tape, an adhesive, grout GR, or the like.

  Here, the covered electric wire 12 will be described. As shown in FIG.3 (b), the covered electric wire 12 is an electric wire which gave the insulating coating 12b to the outer peripheral surface of the conductor 12a. In this embodiment, a covered electric wire 12 having a diameter of 0.3 mm and having an insulating coating formed on the outer peripheral surface is used. The length of the covered electric wire 12 is appropriately determined, and is, for example, 20 to 30 cm. And about the upper end part of the covered wire | conductor 12, the insulation coating 12b is peeled off about several cm, the conductor 12a is exposed, and it is used as a connection part for electrically connecting with the measuring device 13 (refer FIG. 7). . On the other hand, with respect to the lower end portion of the covered electric wire 12, the insulating coating 12b is left and the end face of the conductor 12a is exposed.

  At the lower end portion of the covered electric wire 12, the end surface of the conductor 12a serves as an energization portion for the grout GR. For this reason, as shown to Fig.4 (a), in this embodiment, the lower end of the covered electric wire 12 is arrange | positioned in the vicinity range of the reinforcing bar 6 which grout GR tends to stagnate. Specifically, it is arranged within a range (within the dotted line) that is blocked by the reinforcing bar 6 when viewed from the lower end of the grout GR discharge path 10 (grout GR discharge position). As shown in FIG. 4B, the lower end of the covered electric wire 12 is positioned in a range X that is inside the surface direction with respect to the outer peripheral edge of the upper column member 4. By doing in this way, the filling condition of grout GR can be confirmed about the location where grout GR in the vicinity of a reinforcing bar is especially difficult to fill.

  As shown in FIGS. 5A and 5B, the plurality of covered electric wires 12 are also fixed to the joint member 1 with a space in the outer peripheral direction. That is, the lower end portion of the L-shaped covered electric wire 12 is disposed along the joint surface at the lower end, and the portion above the bent portion is disposed along the side surface. At this time, since the reinforcing bar 6 is not inserted into the joint member 1, the lower end of the covered wire 12 is positioned on the opposite side from the upper end of the injection path 9 in the vicinity of the reinforcing bar through hole 7. In other words, when the reinforcing bar 6 is inserted, the reinforcing bar 6 is disposed within a range blocked by the reinforcing bar 6 when viewed from the upper end of the injection path 9 (filling material injection position).

  If the covered electric wire 12 is fixed to the upper column member 4 or the joint member 1, the upper column member 4 or the joint member 1 is moved and assembled (PC member moving step).

  For example, as shown in FIG. 6, the joint member 1 is arranged on the lower column member 5 with the positions in the surface direction of the reinforcing bar through hole 7 and the reinforcing bar joint portion 8, and the upper column member 4 is joined. The member 1 is lowered from above. Then, the reinforcing bars 6 of the upper column member 4 are inserted into the reinforcing bar through holes 7 of the joint member 1 and further inserted into the reinforcing bar joint portions 8 of the lower column member 5. Thereby, a filling space is formed between the lower surface of the upper column member 4 and the upper surface of the joint member 1 and between the upper surface of the lower column member 5 and the lower surface of the joint member 1.

  When the upper column member 4 or the like is assembled, the grout GR is filled in the filling space (filling material filling step).

  For example, as shown in FIG. 7, a crosspiece 14 is applied along the lower end outer periphery of the upper column member 4 and the upper end outer periphery of the lower column member 5, thereby dividing the outer edge in the surface direction in the upper filling space and the lower filling space. . Thereafter, grout GR is injected from an injection path 9 provided in the lower column member 5. The injected grout GR is filled in the lower filling space and flows into the reinforcing bar joint portion 8 and the reinforcing bar through hole 7. When the injection is continued, the grout GR is filled into the upper filling space through the reinforcing bar through hole 7. When the upper filling space is filled, surplus grout GR is discharged from the discharge path 10 provided in the upper column member 4.

  If the excess grout GR is discharged from the discharge path 10, the resistance value (electrical characteristic) between the conductor 12a of one covered electric wire 12 and the conductor 12a of another covered electric wire 12 is measured (characteristic measuring step) ).

  For example, as shown in FIG. 7, any two of the plurality of covered electric wires 12 fixed to the upper column member 4 or the joint member 1 are selected, and the measuring instrument 13 is connected between the conductors 12a at the upper end portions. To measure the electrical characteristics. For example, the resistance value is measured. Here, when the grout GR is filled up to the lower end of each of the selected covered electric wires 12, since the grout GR has conductivity, the resistance value of the grout GR is measured. On the other hand, when the grout GR is not filled in the lower end of at least one of the covered electric wires 12, the resistance value becomes infinite.

  Then, the combination of the covered electric wires 12 to be selected is changed, and the electrical characteristics are measured for the necessary combination. Here, when there is a combination in which the filling of the grout GR is not recognized, the grout GR is additionally injected and the electrical characteristics are measured again. This operation is repeated for all combinations of the covered electric wires 12 until grout GR filling is recognized.

  If filling of grout GR is recognized, the covered electric wire 12 is removed (removal step).

  For example, as shown in FIGS. 8A and 8B, with the pier 14 removed, the portion above the bent portion of the covered electric wire 12 is tilted to the front side of the operator, and the lower end portion of the covered electric wire 12 Is pulled out from the joint portion 11 (upper joint portion 11U, lower joint portion 11L). At this time, the grout GR of the joint portion 11 is not cured, so that the covered electric wire 12 can be easily pulled out by human power. Moreover, since the thickness of the covered electric wire 12 of the present embodiment is as thin as 0.3 mm, no cavity is generated in the joint portion 11 even if it is pulled out. And a series of work processes are complete | finished by removing all the covered electric wires 12. FIG.

  Thus, according to this embodiment, the filling state of grout GR can be confirmed about the inner side of the surface direction in the joint part 11. And since the lower end of the covered electric wire 12 is arrange | positioned in the circumference | surroundings of the reinforcing bar 6 and the range on the opposite side to the injection path 9, a filling condition can be confirmed about the location where grout GR is especially hard to be filled. Further, since the plurality of covered electric wires 12 are removed after the resistance value is measured and before the grout GR is cured, the filling state of the filler can be confirmed without leaving the covered electric wires 12 in the joints.

  Furthermore, since the lower end part of each covered electric wire 12 is known and arranged on the lower end joint surface of the upper column member 4 and the lower end joint surface of the joint member 1, the upper part of the filling space where the grout GR is difficult to be filled is filled. You can check the situation.

  The above description of the embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof. For example, you may comprise as follows.

  Regarding the PC member to be joined, the upper column member 4, the joint member 1, and the lower column member 5 are exemplified in the above-described embodiment, but are not limited thereto. For example, the same method can be used for joining the left beam member 2, the joint member 1, and the right beam member 3. The same applies to joining column members and joining beam members. In addition, the same applies to the joining of other PC members. In short, the same method can be adopted as long as the first PC member and the second PC member are joined together.

  Regarding the covered electric wire 12, in the above-described embodiment, the coated electric wire 12 having a thickness of 0.3 mm and having the peripheral surface of the conductor 12a provided with the insulating coating as the insulating coating 12b is illustrated, but is not limited thereto. For example, a covered electric wire covered with a vinyl resin or a polyethylene resin may be used. In addition, regarding the lower end portion of the covered electric wire 12, in the above-described embodiment, the end face of the conductor 12a is exposed, but the insulating cover 12b may be peeled off by about several mm to expose the conductor 12a.

  Regarding the filler, the grout GR has been exemplified in the above-described embodiment, but other kinds of fillers may be used as long as they have conductivity in a fluid state and have adhesion to the PC member.

  Regarding the electrical characteristics, the resistance value is exemplified in the above-described embodiment, but the measurement target may be other. For example, it may be a voltage or a current. In short, any characteristic that can be distinguished between the filled state and the unfilled state of the filler may be used.

  In the above-described embodiment, the covered electric wire 12 is removed after the grout GR filling is completed, but the portion exposed to the outside of the joint portion 11 is cut, and the remaining portion is left on the joint portion 11. May be.

  A combination with a conventional method is also possible. For example, the excess grout GR (filler) is discharged from the filling space, and it is determined that the filling is completed on the condition that no air bubbles are contained in the discharged grout GR and conduction between the covered electric wires 12 is confirmed. You may make it do.

DESCRIPTION OF SYMBOLS 1 ... Joint member, 2 ... Left beam member, 3 ... Right beam member, 4 ... Upper column member, 5 ... Lower column member, 6 ... Rebar, 7 ... Rebar penetration hole, 8 ... Reinforcement joint part, 9 ... Grout 10 ... Grout discharge path, 11 ... Joint, 11U ... Upper joint, 11L ... Lower joint, 12 ... Covered wire, 12a ... Conductor, 12b ... Insulation, 13 ... Measuring instrument, 14 ... Pier, GR ... Grout, AR ... Bubble, X ... Range where the lower end of the covered wire is located

Claims (5)

A filling status confirmation method for confirming a filling status of a filler filled in joints of a first PC member and a second PC member,
An electric wire fixing step of fixing the plurality of covered electric wires to the PC member on the bonding surface side so that one end of the covered electric wire is disposed on at least one of the bonding surface of the first PC member and the bonding surface of the second PC member; ,
At least one of the first PC member and the second PC member is moved so that the bonding surface of the first PC member and the bonding surface of the second PC member are close to each other, and a filling space is formed between these bonding surfaces. A PC member moving step to be formed;
The filling is characterized in that after filling the filling material having conductivity in a flowing state into the filling space, a characteristic measuring step for measuring electrical characteristics between a certain covered wire and another covered wire is performed. How to check the filling status of materials. A reinforcing bar is installed between the first PC member and the second PC member,
2. The filling of the filler according to claim 1, wherein, in the electric wire fixing step, one end of the covered electric wire is disposed within a range shielded by the reinforcing bar when viewed from an injection position or a discharge position of the filler. Status confirmation method.   3. The filler according to claim 1, wherein a removal step of removing a plurality of the covered electric wires is performed after the characteristic measurement step before the filler filled in the filling space is cured. How to check the filling status. The first PC member is disposed above the second PC member,
4. The covered electric wire is fixed in the electric wire fixing step so that one end of the conductive coated electric wire is arranged on the joining surface located at the lower end of the first PC member. A method for confirming a filling state of the filler according to claim 1.   5. The filling material status confirmation method according to claim 4, wherein the first PC member and the second PC member are either a column member or a joint member.

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