JP4194034B2 - Method for joining reinforced concrete members - Google Patents

Description

  The present invention relates to a method for joining reinforced concrete members in which a precast reinforced concrete member is joined to a reinforced concrete column member.

  In the high-rise RC laminated construction method, generally, when joining a reinforced concrete column member and a beam member, a joint (panel zone) constructed by placing high-strength reinforced concrete at a work site or the like is used. In recent years, a precast reinforced concrete (hereinafter abbreviated as “PCa”) member is often used as the panel zone, and the PCa member and the reinforced concrete column member or beam member are often joined. The PCa member that becomes the panel zone is embedded with a sheath pipe or the like penetrating in the vertical direction, and the column main bar protruding vertically upward from the upper surface of the reinforced concrete column member is inserted through the sheath pipe and protrudes from the upper surface of the PCa member. And join.

  Conventionally, a filler such as mortar has been used for joining both the reinforced concrete column member and the PCa member which is the panel zone. In joining of both members, conventionally, a joint mortar such as a kneaded mortar is applied to join the column member and the PCa member, and an insertion hole after the joint space and the column main muscle are inserted using a pump or the like from a part of the joint space. On the other hand, a filler such as mortar was injected and cured. This is because the fluidity of fillers such as mortar that have been conventionally used is not so high.

  That is, when a conventional general filler is injected from above the column main reinforcement insertion hole, the replacement of the filler with the air in the sheath tube does not proceed smoothly, and voids are generated, and the filler is completely filled. Was difficult. And when filling was not perfect, the joining force between the members of the said part fell. Therefore, the filler was injected from below the column main reinforcement insertion hole, and the filler was completely filled, but on the other hand, a very laborious work of injecting the filler using a pump or the like from a part of the joint space. It was necessary to carry out at each of a huge number of joints.

On the other hand, the method of joining a pillar member and a PCa member by giving a special process to a PCa member and injecting a filler from the PCa member upper part is disclosed (for example, refer patent document 1). According to the invention described in Patent Document 1, a filler is injected into the PCa member serving as the panel zone from the upper surface of the PCa member in addition to the insertion hole for inserting the shaft reinforcing bar (column main reinforcement) protruding from the column member. An injection hole is provided. And a stop material is installed in the joint space between the column member and the PCa member, both the joint space and the inside of the reinforcing bar insertion hole are filled with the filler injected from the injection hole, and both members are obtained by hardening the filler. Are joined.
JP 2001-193150 A

  However, in recent years, grout materials, which are bonding agents with higher fluidity, have been developed in place of mortars that have been conventionally used as fillers. By using such a grout material with high fluidity, the replacement of the filler and the air in the sheath tube does not proceed smoothly unless the filler is necessarily injected from below the insertion hole as in the prior art. However, if there is an injection hole of a certain size, the filler and the air in the sheath tube can be sufficiently replaced even when the injection hole is injected from above. Further, even if there is a variation in the distance from the filler injection hole to the other insertion hole, there is almost no variation in the rising speed of the filler due to the high fluidity.

  However, such a highly fluid grout material is more expensive than conventional fillers and concrete. Therefore, when the method described in Patent Document 1 is used, it is necessary to use an expensive grout material to fill the portion of the injection hole. Thus, for example, in high-rise buildings, etc., there are a large number of such joints, reducing the use of grout materials for parts that are only needed for injection and do not serve the purpose of original joining. It is hoped that

  Further, in the method described in Patent Document 1, it is necessary to provide a dedicated injection hole in the PCa member separately from the insertion hole only for injecting the filler, and even if the injection hole is a simple concrete hole, There is a problem that extra labor and cost for constructing the PCa member are required.

  Furthermore, the joint between the reinforced concrete column member and the PCa member is also performed at a high place in a high-rise building, and considering that the injection of grout material is performed manually by the field worker, the body is placed at the center of the PCa member. It is better for safety reasons that grout material is injected from the injection hole (insertion hole) closest to the work floor while the worker is standing on the work floor such as work scaffolding, rather than getting on the work. ing.

  This invention is made in view of such a situation, and provides the joining method of the reinforced concrete member which can perform joining of a reinforced concrete pillar member and PCa member used as a panel zone more efficiently and safely. With the goal.

In order to solve the above problems, the present invention is a joining method for joining a precast reinforced concrete member to a reinforced concrete column member,
The precast reinforced concrete member provided with an insertion hole of a predetermined diameter penetrating in the vertical direction is inserted into the corresponding column main reinforcement in each insertion hole. And an installation process for installing joint space,
A fixing step of fixing the periphery of the joint space between the reinforced concrete column member and the precast reinforced concrete member using a stopper;
Working floor side of injecting a predetermined filler from the through hole above, have a filling step of the filling material the joint space and the pillar main reinforcement is uniformly filled into the insertion hole which are inserted,
A plurality of insertion holes are formed in the precast reinforced concrete member, and at least one of the insertion holes formed on the work floor side is formed with an inner diameter larger than the inner diameter of the other insertion holes. ,
In the filling step, the filler is injected from above the insertion hole in which an inner diameter larger than the inner diameter of the other insertion hole is formed .

  ADVANTAGE OF THE INVENTION According to this invention, joining of a reinforced concrete pillar member and PCa member used as a panel zone can be performed more efficiently and safely.

  Hereinafter, with reference to drawings, the example of the joining method between the reinforced concrete members concerning the present invention is described. In the following embodiment, a method of joining a PCa member serving as a panel zone above a PCa column member will be described. However, even if the column member is not a PCa member but a reinforced concrete column member constructed at a work site. It is possible to join using the same joining method. Further, the PCa member having a predetermined diameter insertion hole penetrating in the vertical direction is further joined to the joined PCa member (the PCa member in this case has a column main bar protruding vertically upward from the upper surface thereof). Even if it is a case, it is possible to join using the same joining method.

  FIG. 1 is a schematic view for explaining a joining method between PCa members according to an embodiment of the present invention. As shown in FIG. 1, in this embodiment, an example in which a PCa member 2 serving as a panel zone is joined to a column member 1 serving as a PCa member will be described. As shown in FIG. 1, a plurality of column main bars protrude from the upper surface of the column member 1 in the vertical direction, and a column main bar 11 provided with a sheath tube embedded in the PCa member 2 serving as a panel zone is inserted. The insertion hole 21 for making it penetrate has penetrated. The insertion hole 21 may be formed by filling a pipe other than the sheath pipe or the like, or may be a simple concrete hole.

  In this embodiment, an operator injects grout material from at least one insertion hole among a plurality of insertion holes formed in the PCa member 2. In addition, it is good to make the internal diameter of the insertion hole into which a filler material is inject | poured slightly larger than the internal diameter of the insertion hole only for inserting other column main bars.

  FIG. 2 is a cross-sectional view for explaining a first embodiment in which the PCa member 2 is joined to the column member 1 shown in FIG. FIG. 3 is a flowchart for explaining the joining procedure of the column member 1 and the PCa member 2 in the first embodiment of the present invention.

  In the present embodiment, as shown in FIG. 2, a panel zone in which insertion holes 21a and 21b having predetermined diameters penetrating in the vertical direction are provided on the column member 1 in which the column main reinforcement 11 protrudes in the vertical direction from the upper surface. The PCa member 2 to be joined is joined. When joining, first, the column main reinforcement 11 protruding vertically upward from the upper surface of the column member 1 is inserted into the insertion holes 21a and 21b, respectively, and a predetermined joint space 31 is provided to The PCa member 2 is installed in (Step S11).

  Next, the pillar member 1 and the PCa member 2 are fixed using the stopper 3 around the joint space 31 between the pillar member 1 and the PCa member 2 (step S12). At the work site, workers are usually working on a work floor 7 such as a temporary scaffold made of PCa steel slab plates. And the filler which is a high intensity | strength grout material is inject | poured from the upper part of the penetration hole 21b, and the inside of the penetration hole 21 with which the joint space 31 and the column main reinforcement 11 are penetrated is filled with the said filler (step S13).

Here, the insertion hole for injecting the filler will be described. In the present embodiment, the innermost insertion hole is used for filling material filling so that the filling work can be performed safely without getting out even when the worker on the work floor 7 is at a high place. That is, not the outer insertion hole 21a but the insertion hole 21b on the work floor 7 side is used for filling material injection. In high-rise building construction and the like, the operator becomes able to perform the work at a height of several hundred meters from a few tens of meters, considering the safety the most, is formed near the outside of the building (i.e., working floor or al This is because an operation of injecting from an insertion hole formed closer to the inner side (that is, the work floor side) is preferable to injection from an insertion hole on the far side.

  The filler to be injected will be described. In this embodiment, a grout material having high fluidity is used as the filler. This filler is injected from above the insertion hole 21b using, for example, the filler injection jig 4. The filler injection jig 4 includes a receiving portion 41 that receives a filler from the storage tank 5 that stores the filler, and an injection portion 42 having a predetermined shape for injecting the filler into the insertion hole 21b. Yes. For example, since the injection part 42 is inserted between the insertion hole and the columnar main bar, the shape may be a shape that fits the inner wall surface of the insertion hole and the outer surface of the columnar main bar.

  Then, by inserting a part or all of the injection portion 42 of the filler injection jig 4 above the insertion hole 21b and pouring the filler, the joint space 31 is first filled, and then the column main reinforcement 11 is inserted. The inside of the insertion hole 21 is filled. Thereafter, the filler filled in the insertion hole 21 through which the joint space 31 and the columnar main bar 11 are inserted hardens, so that the formation of the joint and the fixing of the column main bar 11 in the insertion hole 21 are performed simultaneously. . Thereby, the joining process of both members is completed.

  Further, in the present embodiment, the filler is injected from above the insertion hole 21b. However, at least the inner diameter of the insertion hole 21b into which the filler is injected is merely inserted through the column main reinforcement 11 (for example, The inner diameter of the insertion hole 21a) is preferably about 20 to 50 millimeters. This eliminates the need to inject the filler material through the insertion hole at a distance from the normal narrow inner wall. By changing the injection direction of the filler material into the other insertion hole 21 from the bottom to the top, The air accompanying the injection can be discharged smoothly and no voids are generated. Further, by using only a large insertion hole for injecting the grout material, it is possible to use a little extra grout material.

  Of course, the inner diameters of the insertion holes other than the insertion hole 21b for injecting the filler may be similarly increased. In addition, when injecting the filler, the filler may be injected simultaneously from above the plurality of insertion holes. In this case, in addition to the above effects, the filler can be injected more rapidly.

  FIG. 4 is a cross-sectional view for explaining a second embodiment in which the PCa member 2 is joined to the column member 1 shown in FIG. FIG. 5 is a flowchart for explaining a joining procedure between the column member 1 and the PCa member 2 in the second embodiment of the present invention.

  In this embodiment, as shown in FIG. 4, a panel zone in which an insertion hole 21 having the same inner diameter as that of the conventional one penetrating in the vertical direction is provided on the column member 1 in which the column main reinforcement 11 protrudes vertically upward from the upper surface. The PCa member 2 to be joined is joined. However, the PCa member 2 in the present embodiment is provided with a filler injection hole 22 formed so as to penetrate the lower surface from the side surface. The filler injection hole 22 needs to be formed with a sufficient inner diameter for injecting the filler, and is related to the inner diameter of the insertion hole 21 and the like, but it is preferable to have an inner diameter of, for example, about 60 mm. When joining, as in the first embodiment, the column main bars 11 protruding vertically upward from the upper surface of the column member 1 are inserted into the insertion holes 21 and the joint space 31 is provided. The PCa member 2 is installed on the column member 1 (step S21).

Next, the pillar member 1 and the PCa member 2 are fixed using the stopper 3 around the joint space 31 between the pillar member 1 and the PCa member 2 (step S22). In this embodiment, injection of the filling material is a side of PCa member 2, the filling material injection provided injection dedicated filler from the side of the working floor 7, such as work scaffolding consisting of PCa steel slab plate A filler, which is a high-strength grout material, is injected through the hole 22, and the filler is uniformly filled in the insertion hole 21 through which the joint space 31 and the column main reinforcement 11 are inserted, and the filler injection hole 22. (Step S23). Thereafter, the filler filled in the insertion hole 21 through which the joint space 31 and the column main reinforcement 11 are inserted is cured, so that the formation of the joint and the fixing of the column main reinforcement 11 in the insertion hole 21 and the filler injection hole 22 are performed. The hardening of the inner filler is performed simultaneously. Thereby, the joining process of both members is completed.

  The filler used is a grout material having a relatively high fluidity similar to that in the first embodiment. This filler is injected into the filler injection hole 22 from the side surface of the PCa member 2 using, for example, the filler injection jig 6. The filler injection jig 6 includes a receiving portion 61 that receives the filler from the storage tank 5 that stores the filler, an injection portion 62 having a predetermined shape for injecting the filler into the filler injection hole 22, A guide unit 63 having a predetermined length for connecting the receiving unit 61 and the injection unit 62 is provided. For example, the shape of the injection portion 62 may be a shape that can be inserted so as to fit the inlet portion of the filler injection hole 22 on the side surface of the PCa member 2. In addition, the guiding portion 62 can be a metal tube, a rubber hose that can freely change the shape of the guiding path, or the like.

  When the filler is injected, the position (height) of the receiving portion 61 of the filler injection jig 6 is set in the insertion hole 21 through which the joint space 31 and the column main reinforcement 11 are inserted, and in the filler injection hole 22. It is necessary to use a guide portion 63 having a length corresponding to the height of the guide portion 63. If a grout material having high fluidity in recent years is used, it is sufficient to increase the height by about ten centimeters from the highest height (that is, the upper surface of the PCa member 2) into which the grout material is injected. Further, although the inner diameter of the filler injection hole 22 depends on the type of the filler, the filler can be sufficiently efficiently injected even with an inner diameter of about 40 mm.

  As described above, when the grout material injection method according to the present embodiment is used, even if the work is performed at a high place, the worker can safely inject the filler material without getting out of the work floor 7 to the outside. It becomes possible. It is not necessary to inject the filler at a distance from the narrow inner wall as in the prior art, and the discharge of air accompanying the injection of the filler can be smoothly performed by changing the injection direction of the filler into the insertion hole 21 from the bottom to the top. It can be performed and no voids are generated. Moreover, injection into a large number of insertion holes can be performed simultaneously by injection from one place, and efficient filling material injection is possible.

  The column member 1 and the PCa member 2 may be bonded together using the bonding method of the first embodiment and the bonding method of the second embodiment described above. Further, the insertion hole may be formed in the PCa member 2 serving as a panel zone by embedding a sheath tube or the like as described above, but may simply be a concrete hole. Further, the inner wall may be provided with irregularities or the like for enhancing the engagement with the hardening filler. Furthermore, the filler injection hole 22 may also be formed in the panel zone by embedding a sheath tube or the like, or may be a simple concrete hole.

  In addition, as the stopper 3 to be installed and fixed around the joint space 31, for example, a plate or a formwork is pressed along the outer periphery of the stigma, or a mortar belt is formed along the inner periphery of the stigma. Can be used.

It is a schematic diagram for demonstrating the joining method between the PCa members which concern on one Embodiment of this invention. It is sectional drawing for demonstrating the 1st Example which joins the PCa member 2 to the column member 1 shown in FIG. It is a flowchart for demonstrating the joining procedure of the column member 1 and the PCa member 2 in 1st Example of this invention. It is sectional drawing for demonstrating the 2nd Example which joins the PCa member 2 to the column member 1 shown in FIG. It is a flowchart for demonstrating the joining procedure of the column member 1 and the PCa member 2 in the 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column member 2 PCa member 3 Stopping material 4, 6 Filling material injection jig 5 Storage tank 7 Work floor 11 Column main reinforcement 21, 21a, 21b Insertion hole 22 Filling material injection hole 23 Air discharge hole 31 Joint space 41, 61 Receiving part 42, 62 Injection part 63 Guide part

Claims (2)

A joining method for joining a precast reinforced concrete member to a reinforced concrete column member,
The precast reinforced concrete member provided with an insertion hole of a predetermined diameter penetrating in the vertical direction is inserted into the corresponding column main reinforcement in each insertion hole. And an installation process for installing joint space,
A fixing step of fixing the periphery of the joint space between the reinforced concrete column member and the precast reinforced concrete member using a stopper;
Work floor side of injecting a predetermined filler from the through hole above, possess a filling step of the filling material the Meji space and the pillar main reinforcement is uniformly filled into the insertion in holes are inserted,
A plurality of insertion holes are formed in the precast reinforced concrete member, and at least one of the insertion holes formed on the work floor side is formed with an inner diameter larger than the inner diameter of the other insertion holes. ,
The joining method , wherein the filling step injects the filler from above an insertion hole in which an inner diameter larger than an inner diameter of the other insertion hole is formed . 2. The joining method according to claim 1 , wherein an inner diameter of an insertion hole in which an inner diameter larger than an inner diameter of the other insertion hole is formed is approximately 20 mm larger than an outer diameter of the column main reinforcement to be inserted. .

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