JP2022187353A - Joining structure - Google Patents

Abstract

To provide a joining structure, etc., between precast members which are easy to construct and does not cause damage or the like to the members.SOLUTION: A joining structure 10 joins half-PCa members 1 used in the construction of a structure to each other. The half PCa member 1 is provided with a buried form 2 of the structure and a main steel material 3. A joint material 4 is provided at the end of the buried form 2 of one half PCa member 1-1, and the main steel material 3 of the half PCa member 1-1 is arranged inside the joint material 4. The main steel material 3 protruding from the buried form 2 of the other half PCa member 1-2 is arranged inside the joint material 4, and the inside of the joint material 4 is filled with concrete C.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a joint structure between precast members.

Half precast members (hereinafter referred to as half PCa members) that integrate the main steel material of the structure and the embedded formwork have high rigidity, so it is possible to omit the shoring on the bottom surface and sides of the formwork. , which is effective in improving productivity when constructing a structure.

When half PCa members are placed side by side, the main steel materials of adjacent half PCa members are generally joined by friction joints or welded joints. Sometimes the work is not easy.

On the other hand, Patent Document 1 discloses a joint structure in which a notch provided in a precast member is used to form a lap joint of the main steel material in the same manner as a lap joint of reinforcing bars, and filling concrete is placed in the joint portion. This facilitates the joining operation between precast members.

Patent No. 6375079

However, in the joint structure described in Patent Document 1, the cross section of the precast member is lost due to the notch, so there is a possibility that the precast member will be damaged if a load such as the weight of materials and equipment acts on the joint portion during construction. In order to prevent damage to the precast member, it is necessary to increase the thickness and strength of the member.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and an object thereof is to provide a joint structure or the like for precast members that is easy to construct and that does not cause damage to the members.

The present invention for achieving the above-mentioned object is a joint structure for joining precast members having an embedded formwork and a reinforcing member of the structure, which is used when constructing the structure, wherein one precast member A joint member is provided at the end of the embedded mold of the precast member, the reinforcing member of the precast member is disposed inside the joint member, and the reinforcing member protruding from the embedded form of the other precast member The joint structure is arranged inside a joint material, and is characterized in that the inside of the joint material is filled with a filler.

In the present invention, the reinforcing members of both precast members can be reinforce each other simply by arranging the reinforcing member of the other precast member inside the joint member installed at the end of the embedded formwork of one of the precast members and filling the filler with the filler. Since the joint is established, there is little on-site work and construction is easy. In addition, since the reinforcing material is arranged inside the joint material, there is no need to notch the end of the embedded formwork, and there is no risk of damage to the end of the embedded formwork.

It is preferable that the joint member is channel-shaped, partly embedded in the embedded mold of one of the precast members, and the other part open in the normal direction of the embedded mold.
In one precast member, by embedding a part of the joint material in the embedded mold, the joint material can reinforce the end of the embedded mold and prevent the end of the embedded mold from being damaged. In addition, by making the joint material groove-shaped and opening the other part in the normal direction of the embedded formwork, the other precast member is arranged so that the reinforcing material is inserted into the joint material from the open surface of the joint material. This makes field work easier. Moreover, since the filling property of the filler is good, the quality of the joint portion is improved.

Concavo-convex portions may be provided on the reinforcing member. It is also desirable that the reinforcing member is provided with an end plate.
As a result, the adhesion between the reinforcing material and the filler material is improved, and the stress transmission performance of the joint portion is improved. Further, by providing the reinforcing material with an end plate, the anchoring force of the reinforcing material to the filler can be increased to prevent the reinforcing material from slipping out of the joint portion.

An uneven portion may be provided on the inner surface of the joint material. In addition, the joint member may have side plates positioned on both sides of the reinforcing member, and the interval between the side plates may decrease from the intermediate portion to the end portion of the joint member in the member axial direction of the reinforcing member. desirable. Furthermore, it is desirable that an end plate for preventing the filler from slipping out is provided at the end of the joint member in the member axial direction of the reinforcing member.
This improves the stress transmission performance of the joint portion. Further, by providing the joint material with the end plate, the concrete inside the joint material can be prevented from falling out when a pull-out force acts on the reinforcing material.

It is also desirable that the joint member has side plates located on both sides of the reinforcing member, and reinforcing portions for reinforcing the side plates against swelling to the outside.
For example, in the case of using a reinforcing material having an uneven portion on the side facing the side plate of the joint material, when a pull-out force acts on the reinforcing material, the uneven portion tries to get over the filler, causing the filler to move outward. In some cases, the side plates of the joint material bulge outward. In this way, if there is a risk that the side plate will swell outward when a pull-out force acts on the reinforcing member, the joint member may be provided with a reinforcing portion to prevent the side plate from swelling and ensure stress transmission performance.

It is also desirable that the joint member has a side plate arranged between the plurality of reinforcing members of one precast member and a side plate arranged outside the plurality of reinforcing members.
In this case, the pushing force of the filler acts on the side plate between the reinforcing members from both sides, and these forces are canceled out. Therefore, the side plate does not bulge.

ADVANTAGE OF THE INVENTION According to this invention, the joint structure of precast members etc. which construction is easy and does not produce the damage etc. of members can be provided.

4 is a view showing a joint structure 10 of the half PCa member 1; FIG. 4 is a view showing a joint structure 10 of the half PCa member 1; FIG. The figure which shows the state which cast the concrete C. FIG. The figure which shows the modification of arrangement|positioning of the main steel material 3 and the joint material 4. FIG. The figure which shows the modification of the cross section of the joint material 4. FIG. The figure which shows the modification of the main steel material 3. FIG. The figure which shows the modification of the joint material 4. FIG. The figure explaining the reinforcement part of the side plate 41, and the joint material 4a.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1(a) is a diagram showing a joint structure 10 according to an embodiment of the present invention. The joining structure 10 joins the half PCa members 1 (1-1, 1-2) juxtaposed in the horizontal direction. Each half PCa member 1 (1-1, 1-2) to be joined is shown in FIG. 1(b).

A half PCa member 1 is a precast member used when constructing a structure such as a slab, and includes an embedded mold 2 and a main steel member 3 for the structure. A joint member 4 is provided at the end of the half PCa member 1-1 on the embedding form 2 of the half PCa member 1 to be joined, on the other half PCa member 1-2 side.

The embedded formwork 2 is a plate-like concrete member, and a structure such as a slab is constructed by placing concrete C on the embedded formwork 2 as a bottom formwork.

The main steel material 3 is a reinforcing material for the structure and is provided on the upper surface of the embedded formwork 2 . The main steel material 3 is, for example, a flat steel, and a plurality of the main steel materials 3 are arranged in parallel with the plate surface thereof set in the vertical direction. The main steel material 3 is not limited to flat steel, and various steel materials including other shaped steel such as H-shaped steel, angle steel, and channel steel can be used.

Of the two end portions of the main steel material 3 of the one half PCa member 1-1, the end portion located on the side of the other half PCa member 1-2 is arranged in the joint material 4. As shown in FIG. The joint member 4 is provided corresponding to each of the plurality of main steel members 3 of the half PCa member 1-1.

In addition, of the both ends of the main steel material 3 of the other half PCa member 1-2, the end located on the one half PCa member 1-1 side is the end face of the embedded form 2 on the half PCa member 1-1 side. protrude from This end portion is placed in the joint member 4, and in the joint member 4, the main steel members 3 of both half PCa members 1 are arranged so that the member axial directions are aligned.

2(a) and 2(b) are diagrams showing cross sections of the joint structure 10 in the thickness direction of the embedded mold 2. FIG. FIG. 2(a) is a cross section along the member axial direction of the main steel material 3, and FIG. 2(b) is a cross section of the main steel material 3 along the line AA in FIG. 2(a) in the direction orthogonal to the axis. . The direction perpendicular to the axis of the main steel material 3 is a direction perpendicular to the member axial direction of the main steel material 3 in a plane. FIG. 2(c) is a diagram showing a horizontal cross-section of the joint structure 10 at the height of the main steel material 3. As shown in FIG. 2(a) to 2(c) show the state before the concrete C is placed.

A channel-shaped steel material having side plates 41 and a bottom plate 42 is used for the joint member 4, and its cross section is U-shaped. As shown in FIG. 2(b), a part of the joint material 4 is embedded in the embedded formwork 2, and the other part is exposed on the upper surface of the embedded formwork 2. 2(b) corresponding to the vertical direction). The joint material 4 is installed with its axial direction aligned with the member axial direction of the main steel material 3 .

In this embodiment, after one half PCa member 1-1 is installed, the other half PCa member 1-2 is moved from above as shown by arrow a in FIG. The protruding end of the main steel material 3 is inserted into the joint material 4 from the open surface of the joint material 4, and the main steel materials 3 of the half PCa members 1-1 and 1-2 are inserted inside the joint material 4. Arrange the members so that their axial directions are aligned.

At this time, as shown in FIG. 2(a), the end surfaces of the embedded formwork 2 of the half PCa members 1-1 and 1-2 abut each other, and then the embedded formwork of the half PCa members 1-1 and 1-2 By placing concrete C on 2, a structure such as a slab is constructed.

FIG. 3 shows the state after placing the concrete C in the same cross section as FIG. 2(c). In this embodiment, the interior of the joint material 4 is also filled with concrete C as a filler, and a joint portion between the main steel members 3 of the half PCa members 1-1 and 1-2 is formed inside the joint material 4. FIG. At the joint portion, stress (shear stress) is transmitted between the main steel members 3 via the concrete C and the joint member 4 when a pull-out force acts on the main steel member 3 .

As described above, in this embodiment, the main steel member 3 of the other half PCa member 1-2 is arranged inside the joint member 4 installed at the end of the embedded formwork 2 of the other half PCa member 1-1. Since the joints between the main steel members 3 of the two half PCa members 1-1 and 1-2 are established only by filling the joints with the concrete C, there is little on-site work and the construction is easy. Moreover, since the main steel material 3 is arranged inside the joint material 4, there is no need to notch the end of the embedded form 2, and there is no risk of damage to the end of the embedded form 2.

Further, in this embodiment, by embedding a part of the joint material 4 in the embedded formwork 2, the joint material 4 can reinforce the end of the embedded formwork 2 and prevent damage to the end of the embedded formwork 2. can be prevented. In addition, by making the joint member 4 groove-shaped and opening the other portion in the normal direction of the embedded mold 2, the half PCa member 1-2 can be moved from the open surface of the joint member 4 to the inside of the joint member 4. It can be positioned to be inserted into the Moreover, since the concrete C has a good filling property, the quality of the joint portion is also improved.

However, the invention is not limited to the above embodiments. Modifications of the joint structure 10 of the present invention will be described below, but the configurations described below and the configurations described in the above embodiments can be used in combination as necessary.

For example, in this embodiment, the embedded formwork 2 is provided with the main steel material 3 such as a flat steel as a reinforcing material for the structure, but a reinforcing bar or the like may be provided as a reinforcing material instead. The structure constructed using the half PCa member 1 may be a wall-like or columnar structure. In this case, it is also possible to arrange the half PCa members 1 side by side in the vertical direction and form a joint using the joint material 4 or the like between the main steel members 3 of the upper and lower half PCa members 1 .

In addition, in this embodiment, the concrete C is filled inside the joint material 4 when the concrete C of the structure is placed, and it is not necessary to fill the inside of the joint material 4 with a filler in a separate process. It is possible to fill the interior with a separate filler, and the filler is not limited to concrete. For example, it is possible to use cementitious materials other than concrete, and it is also possible to use fillers other than cementitious materials. In particular, if the material expands during hardening, the joint material 4 restrains the expansion pressure, thereby increasing the frictional force acting on the main steel material 3 and contributing to the transmission of stress (shear stress). A filler that can be expected to have adhesive strength with the joint material 4 and the main steel material 3 is also suitable.

In this embodiment, part of the joint material 4 is embedded in the embedded formwork 2, but the joint material 4 is placed and fixed on the upper surface of the embedded formwork 2 so as not to be embedded in the embedded formwork 2. is also possible.

Further, the main steel members 3 of the half PCa members 1-1 and 1-2 may be arranged at arbitrary positions as long as they are inside the joint member 4. FIG. For example, as shown in FIG. 4(a), they may be arranged in parallel inside the joint material 4, and stress transmission through the concrete C between the main steel materials 3 becomes possible. Further, as shown in FIG. 4(b), the positions of the joint members 4 in the member axial direction of the main steel member 3 are changed, and the positions of some of the joint members 4 are shifted from the other joint members 4 and arranged in a staggered manner. Also, stress concentration at the joint can be alleviated.

The cross-sectional shape of the joint material 4 is not particularly limited as long as the end portion of the main steel material 3 can be accommodated therein. For example, the bottom plate 42 of the joint member 4 may be U-shaped as shown in FIG. 5(a) or V-shaped as shown in FIG. 5(b). By projecting downward, bleeding that occurs on the lower surface of the joint material 4 can be suppressed when the embedded formwork 2 is manufactured from concrete. In some cases, the upper surface of the joint material 4 may be closed and the cross section of the joint material 4 may be cylindrical. However, in this case, it is necessary to laterally move the half PCa member 1-2 to insert the main steel member 3 into the joint member 4, which makes construction difficult.

Concerning the main steel material 3 as well, it is possible to provide an uneven portion on the surface of the joint material 4 facing the side plate 41 at the end portion of the main steel material 3 inserted into the joint material 4 . The irregularities can be formed by welding bars such as reinforcing bars to the surface of the main steel material 3, grooving the surface of the main steel material 3, or forming studs 31, which are uneven parts, as shown in FIG. can be provided, and the adhesion of the concrete C can be improved to improve the stress transmission performance of the joint portion. The uneven portion of the main steel material 3 is not limited to this, and for example, a perforated plate 32 may be provided as shown in FIG. 6(b). Also, the end portion of the main steel material 3 itself may be provided with a hole, and the same effect can be obtained. Furthermore, as shown in FIG. 6(c), it is possible to provide an end plate 33 at the end of the main steel material 3, which increases the fixation force of the main steel material 3 to the concrete C, and thus acts on the main steel material 3. The pull-out force can prevent the main steel material 3 from slipping out of the joint portion, and stress can be reliably transmitted between the main steel materials 3 .

As for the joint material 4, as shown in FIG. 7(a), the inner surface of the side plate 41 can be provided with an uneven portion, which can also improve the stress transmission performance of the joint portion in the same manner as described above. Although studs 43 are provided as uneven portions in FIG. 7A, the uneven portions are not particularly limited. It is also possible to provide an uneven portion by forming a groove, or to provide a perforated plate. Alternatively, holes may be provided in the joint member 4 itself.

Furthermore, as shown in FIG. 7(b), the interval between the side plates 41 located on both sides of the main steel material 3 is made smaller from the intermediate part to the end part of the joint material 4 in the member axial direction of the main steel material 3. can also As a result, the shear stress generated in the concrete C when the pull-out force acts on the main steel material 3 can be easily transmitted to the side plate 41, and the pull-out of the concrete C inside the joint material 4 is prevented. Improves transmission performance.

In addition, as shown in FIG. 7C, end plates 44 can be provided at both ends of the joint member 4 in the member axial direction of the main steel member 3, and the end portions of the joint member 4 are closed by the end plates 44. As a result, the concrete C inside the joint material 4 can be prevented from coming out when the pull-out force acts on the main steel material 3 , and stress can be reliably transmitted between the main steel materials 3 . Reference numeral 441 denotes a slit provided in the end plate 44 for passing the main steel material 3 through.

In the example of FIGS. 7A to 7C, the main steel 3 is provided with the stud 31, but if the main steel 3 is provided with an uneven portion such as the stud 31 or an end plate 33, the main steel 3 can be pulled out. When a force acts, the uneven portions of the main steel material 3, etc., try to climb over the concrete C, generating a force that pushes the concrete C inside the joint material 4 toward the side plates 41, thereby generating the side plates of the joint material 4. 41 may bulge outward and impair the stress transmission performance. In this way, if there is a risk that the side plate 41 will swell outward when a pull-out force acts on the main steel material 3, the joint material 4 may be provided with a reinforcing portion for reinforcing the side plate 41 that swells outward. It is also desirable to reduce the cost by making the side plate 41 thin.

For example, as shown in FIG. 8A, the side plates 41 of the joint member 4 adjacent to each other are connected by a connecting plate 45 (reinforcement portion) arranged in the direction perpendicular to the axis of the main steel member 3, so that the side plates of the joint member 4 41 can be reinforced and swelling of the side plate 41 can be prevented. Alternatively, as shown in FIG. 8B, triangular reinforcing ribs 46 (reinforcing portions) may be arranged at the corners of the side plate 41 and the bottom plate 42, and the reinforcing ribs 46 may be fixed to the side plate 41 and the bottom plate 42. This also reinforces the side plate 41 and prevents it from swelling. A similar reinforcing rib 46 can also be provided on the outside of the side plate 41 . Also, the shape of the reinforcing rib 46 is not particularly limited.

Furthermore, as shown in FIG. 8(c), the side plates 41 of the joint member 4 can be connected to each other by a connecting member 47 (reinforcement portion) in the direction perpendicular to the axis of the main steel member 3. The connecting member 47 is, for example, a bolt or threaded reinforcing bar. The resistance can prevent swelling of the side plate 41 .

In addition, as shown in FIG. 8(d), the joint member 4a is composed of a side plate 41a arranged between a plurality of adjacent main steel members 3 and a side plate 41b arranged outside the plurality of main steel members 3. It is good also as a structure which has. In this case, the pushing force of the concrete C acts from the main steel material 3 on both sides of the side plate 41a toward the side plate 41a, and these pushing forces are canceled, so that the side plate 41a does not swell. Although not shown, swelling of the outer side plate 41b can be prevented by using a reinforcing portion such as the reinforcing rib 46 in FIG. 8(b) or the connecting member 47 in FIG. 8(c).

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

1, 1-1, 1-2: Half PCa member 2: Embedded formwork 3: Main steel material 4, 4a: Joint material 10: Joint structure 31, 43: Stud 32: Perforated plate 33: End plate 41, 41a, 41b: side plate 42: bottom plate 44: end plate 45: connecting plate 46: reinforcing rib 47: connecting member

Claims (9)

A joint structure for joining precast members having an embedded formwork and a reinforcing material of the structure, which is used when constructing the structure,
A joint member is provided at the end of the embedded formwork of one of the precast members, and the reinforcing member of the precast member is arranged inside the joint member,
The reinforcing member protruding from the embedded mold of the other precast member is arranged inside the joint member,
A joint structure, wherein the inside of the joint material is filled with a filler. 2. The joint material according to claim 1, wherein said joint member has a channel shape, and a part is embedded in said embedded mold of one of the precast members, and the other part is open in the normal direction of said embedded mold. junction structure. 3. The joining structure according to claim 1, wherein the reinforcing member is provided with uneven portions. 4. The joining structure according to any one of claims 1 to 3, wherein the reinforcing member is provided with an end plate. The joining structure according to any one of claims 1 to 4, wherein an uneven portion is provided on an inner surface of the joint material. The joint member has side plates positioned on both sides of the reinforcing member,
The joining structure according to any one of claims 1 to 5, wherein the interval between the side plates decreases from the intermediate portion to the end portion of the joint member in the member axial direction of the reinforcing member. 7. The end plate for preventing the filling material from slipping out is provided at the end of the joint material in the member axial direction of the reinforcing material. junction structure. 8. The joint material according to any one of claims 1 to 7, wherein the joint member has side plates positioned on both sides of the reinforcing member, and reinforcing portions for reinforcing the side plates against swelling to the outside. Joint structure as described. 9. The joint member has a side plate arranged between a plurality of reinforcing members of one precast member, and a side plate arranged outside the plurality of reinforcing members. The junction structure according to any one of .

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