JP2000220206A - Joint structure of vertical precast concrete members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of a vertical precast concrete member which has an advantage of easy construction of a joint structure of bolt and nut fastening, has sufficient strength, and has no protrusion of a joint step after construction. I do. SOLUTION: An anchor bolt through hole 4 provided substantially perpendicularly to a joining end face toward the inside of the member, a concave portion or an opening portion 5 provided from a side surface of the member and communicating with the anchor bolt through hole 4, a concave portion or an opening. A vertical precast concrete member 1 having a reinforcing bar 6 provided so as to surround the opening 5 and a precast concrete member 2 having an anchor bolt 11 projecting therefrom, and the anchor bolt 11 is inserted through the anchor bolt through hole 4. The nut 13 was firmly screwed onto the head of the anchor bolt 11 protruding into the recess or opening 5, and the recess or opening 5 was filled with concrete or mortar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for precast reinforced concrete structures, and more particularly to a joint structure for fixing a vertical precast concrete member.

[0002]

2. Description of the Related Art In the technical field of precast reinforced concrete structures, the structure of joining precast concrete members is not only important in structure, but also one of the major construction items in terms of construction. For this reason, various joining methods and joining structures have been conventionally proposed.

[0003] In general, the method and structure of joining precast concrete members are roughly classified into wet joints and dry joints.

[0004] The wet joint is a joint structure in which concrete is poured into a joint of a precast concrete member at a construction site and stress is transmitted by the concrete or mortar itself. On the other hand, a dry joint is a joint structure in which reinforcing bars of a precast concrete member are connected to each other so that stress can be transmitted by the reinforcing bars.

[0005] The present invention relates to a dry joint and a dry joint structure for joining vertical precast concrete members. Therefore, a joint structure of a vertical precast concrete member by a conventional dry joint method will be schematically described below.

FIG. 3 shows a joining structure of a vertical precast concrete member by a general dry joint.

The joint structure of the vertical precast concrete members shown in FIG. 3 includes a lower vertical precast concrete member 30, an intermediate horizontal precast concrete member 31, and an upper vertical precast concrete member 3.
2 is joined.

This vertical precast concrete member joining structure is characterized in that the main reinforcement 33 of the lower vertical precast concrete member 30 and the main reinforcement 34 of the upper vertical precast concrete member 32 are directly joined. The main bars in FIG.
However, a welded joint or the like can be employed in a similar method.

In this joint structure of a vertical precast concrete member, a concave portion 36 is provided in advance at an upper end portion of the lower vertical precast concrete member 30, and the upper end portion of the main reinforcement 33 of the vertical precast concrete member 30 is provided in the concave portion 36. It is protruding. Further, the concave portion 36 is provided with a plane portion that supports the end of the intermediate horizontal precast concrete member 31. On the other hand, a concave portion 37 is provided in advance at the lower end of the upper vertical precast concrete member 32, and the lower end of the main reinforcement 34 of the vertical precast concrete member 32 projects into this concave portion 37.

At the construction site, as shown in FIG. 3, a lower vertical precast concrete member 30, an intermediate horizontal precast concrete member 31, and an upper vertical precast concrete member 32 are assembled, and a main reinforcement 33 of the lower vertical precast concrete member 30 is assembled. And the main reinforcement 34 of the upper vertical precast concrete member 32 abut against each other.
Is fitted.

Next, the crimping sleeve 35 is cold-pressed from the outside thereof with the force of a hydraulic machine so as to bite into the irregularities on the surface of the main reinforcement, and the main reinforcements 34 and 35 are integrally joined.

Finally, mortar or concrete is poured into the concave portions 36 and 37. Meanwhile, the precast concrete members 30, 31, 32 are supported by temporary supports so as not to fall down.

According to the joining structure shown in FIG. 3, there is no need to cast concrete at a construction site, and the amount of work can be reduced as compared with a wet joint.

FIG. 4 shows a joint structure of a vertical precast concrete member using a mortar-filled sleeve.

The joint structure of this vertical precast concrete member is a joint structure that can be said to be a wet joint in that a grout material such as mortar or concrete is injected between the joint bar and the sleeve. It is listed here as a kind of dry joint in that it is possible.

The joining structure of the vertical precast concrete members shown in FIG. 4 is composed of a lower vertical precast concrete member 40 and an upper vertical precast concrete member 41.
And are joined.

In the joint structure of this vertical precast concrete member, the lower vertical precast concrete 4
0 is the upper vertical precast concrete member 4
1 is formed on an end surface of a flat surface on which the main bar 42 can be placed, and an upper end portion of the main bar 42 protrudes from the end surface. On the other hand, at the lower end of the upper vertical precast concrete member 41, a hollow spindle-shaped sleeve 44 into which the lower end of the main bar 43 is inserted is provided in advance. The lower end of the sleeve 44 is the upper vertical precast concrete member 41.
It is open at the lower end surface of.

At the construction site, as shown in FIG.
The vertical precast concretes 40 and 41 are assembled so that the upper end projecting portion of the main bar 42 of the lower vertical precast concrete 40 is inserted into the inside of the sleeve 44.

Next, as shown in FIG. 4, the sleeve 4 is supplied through a grout material inlet 45 provided in the sleeve 44 in advance.
A grout material such as mortar is injected into 4 and hardened.
After hardening, the sleeve 44, the grout material and the main bars 42, 43
Are integrated into a vertical precast concrete 40,4
1 are joined together. Until joining is completed,
The precast concrete members 40 and 41 are supported by temporary supports so as not to fall down.

According to the joining structure shown in FIG. 4, if the joining bar is located within the inner diameter of the sleeve, joining is possible, and the requirement for the dimensional accuracy of the precast concrete member can be considerably relaxed.

Next, FIG. 5 shows a joint structure of a vertical precast concrete member by tightening bolts and nuts.

The joining structure of the vertical precast concrete members shown in FIG. 5 is composed of a lower vertical precast concrete member 50 and an intermediate horizontal precast concrete member 5.
1, 52 and the upper vertical precast concrete member 53 are joined.

In this joint structure of the vertical precast concrete members, the upper vertical precast concrete members 53 are used for fastening with bolts and nuts.
A joint step 54 is bulged at a lower end portion of the base member, and an anchor bolt through hole 55 is provided in the joint step 54.

On the other hand, an anchor bolt 56 is provided at the upper end of the lower vertical precast concrete member 50, and the upper end of the anchor bolt projects substantially vertically upward from the upper end surface of the lower vertical precast concrete member 50. ing.

The horizontal precast concrete members 51,
52 has grooves 57, 58 that abut each other to form a through hole for the anchor bolt 56.

At the construction site, the vertical precast concrete members 50 and 53 and the horizontal precast concrete members 51 and 52 are assembled as shown in FIG.

That is, the ends of the horizontal precast concrete members 51 and 52 are placed on the lower vertical precast concrete member 50, and the projecting ends of the anchor bolts 56 are passed through the anchor bolt through holes 55 of the upper vertical precast concrete member. The precast concrete member 53 is installed.

Thereafter, a washer 59 is fitted to an end of the anchor bolt 56 projecting from the upper surface of the joining step 54, and a nut 60 is screwed.

Then, mortar or concrete is applied to the upper surface of the joining step portion 54 of the upper vertical precast concrete member 53 to the extent that the head of the anchor bolt 56 is buried for rust prevention, fire resistance or aesthetic appearance.

According to the joining structure of the vertical precast concrete members by tightening the bolts and nuts, the precast concrete members can be joined by tightening the bolts and nuts at the construction site. Can be simplified. In addition, since the joint can be performed if the position of the anchor bolt 56 is within the radius of the bolt through hole 55, the requirement for the dimensional accuracy of the precast concrete member at the time of manufacturing the factory can be considerably relaxed.

[0031]

However, the above-mentioned conventional joint structures for vertical precast concrete members have problems to be solved.

First, the joining structure of the vertical precast concrete members by the crimp sleeve or the like shown in FIG. 3 has a serious disadvantage that a precast concrete member having high dimensional accuracy is required.

Since a large number of precast concrete members are manufactured in a precast factory and assembled on site, even if each precast concrete member includes a slight manufacturing error, the manufacturing error is not large on a large number of assembled structures. It has been extremely difficult to ensure that the joints at the joints of all the precast concrete members abut correctly because of the tendency to accumulate and the site dimensions may differ from the design. For this reason,
In some cases, joining by this joining structure cannot be performed correctly.

Further, in this joint structure, the amount of work for joining with a crimping sleeve, joining by welding, joining with a screw joint, etc. can be said to be smaller than that of casting concrete at a construction site like a wet joint. Nevertheless, since each joining bar must be joined by a skilled worker, the operation is complicated.
In addition, after the joining of the joining bars, the work of filling concrete or the like for rust prevention or fire resistance was also difficult due to the large opening of the joining portion.

Further, it is necessary to support the precast concrete member with a temporary support or the like until the joining is completed, which is troublesome, and has the drawback that the next work cannot be started.

The joint structure of the vertical precast concrete member using the mortar-filled sleeve shown in FIG.
Although the manufacturing accuracy of the precast concrete member is eased, after joining the vertical concrete member, grout material is injected from the grout material inlet provided at the upper end and the lower end of the sleeve, and the grout hardens. Since it was necessary to support the vertical precast concrete members with supports and the like until they exhibited strength, the amount of work was large, and it was possible to remove the supports and perform the next work until the joint structure exhibited strength. There were drawbacks such as inability to do so

Further, the joining structure of the vertical precast concrete members using the bolts and nuts shown in FIG. 5 is extremely simple in joining work and can be carried out quickly, but is joined at the joining step. However, since the fastening point is shifted from the structural strength of the vertical precast concrete member and a moment is applied to the joint, the joint step is easily cracked, and the usable strength is limited.

In addition, in the case of this joining structure, the joining step remains protruding from the floor or the like even after the construction, which is not preferable in terms of space utilization efficiency and aesthetic appearance.

Further, according to this joint structure, the bolt
In order to prevent rust and fire of the nut, it was necessary to apply a mortar or the like over the entire upper surface of the joining step to a thickness such that the bolt head and the nut were buried. In this work, mortar was also overcoated on parts other than the bolt head, and there was a problem to be rationalized in this regard.

The problem to be solved by the present invention is to solve the problem of strength, which is an advantage that the work can be easily performed by fastening bolts and nuts and that is a drawback of the conventional bolt-nut joint structure. Another object of the present invention is to provide a joint structure of a vertical precast concrete member which is easy to rust-proof and fire-resistant, since there is no protrusion of a joint step on a floor or the like after construction.

[0041]

According to the present invention, there is provided a joint structure for a vertical precast concrete member, the anchor bolt through hole being provided substantially perpendicularly to the joint end face toward the inside of the member, and communicating with the anchor bolt through hole. A vertical precast concrete member having a concave portion or an opening provided from the side surface of the member and a reinforcing bar provided so as to surround the concave portion or the opening, and an anchor bolt protruding substantially perpendicularly to a joint end surface. The anchor bolt is inserted through the anchor bolt through hole of the vertical precast concrete member, and a nut is tightly screwed onto a head of the anchor bolt projecting into a recess or opening of the vertical precast concrete member. Or the recess of the vertical precast concrete member or The mouth is characterized in that the supplemented by concrete or mortar.

According to the joining structure of the present invention, since the precast concrete members are joined to each other by connecting the bolts and the nuts, it is sufficient if the precast concrete members can be supported when the nuts are tightened, and the construction can be carried out quickly. In addition, temporary tightening, final tightening, and the like can be performed for centering.

Further, according to the joint structure of the present invention, the positions of the bolts and nuts are located inside the precast concrete member, and the concave portions and the openings are formed integrally with the precast concrete member by reinforcing bars so as to be integrated with the precast concrete member. Since it is reinforced, the moment applied to the fastening portion of the bolt / nut is small, and the usable strength can be greatly improved as compared with the conventional bolt / nut joint. Further, since the bolts and nuts are located inside the precast concrete member, there is no protrusion at the joint step after construction, so that the space utilization efficiency can be increased.

Finally, according to the joint structure of the present invention, the mortar or concrete for rust prevention and fire resistance is a recess or opening opened on the side of the precast concrete member, so that it is easy to fill. The amount of mortar or concrete used for filling is small, and a beautiful finished appearance can be obtained.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the "joining structure for vertical precast concrete members" according to the present invention will be described below with reference to the accompanying drawings 1 and 2. FIG.

FIG. 1 is a longitudinal sectional view of one embodiment of the “joining structure of vertical precast concrete members” according to the present invention. On the other hand, FIG. 2 is another longitudinal cross-sectional view of the joining structure shown in FIG. 1 as viewed from the AA direction shown in FIG.

FIGS. 1 and 2 show a joint structure in which a vertical precast concrete panel serving as a handrail is joined to a horizontal precast concrete panel serving as a floor portion of a veranda of a building. The present invention is not limited to this, and can be applied to a joining structure for joining a wide vertical precast concrete member, for example, a wall or a pillar serving as a structural member of a building.

Therefore, in the description of FIGS. 1 and 2, in consideration of unity with the terms of the claims, “vertical precast concrete members” and “vertical precast concrete members” are used instead of the “railing panels” and “floor panels”, respectively. Precast concrete members with anchor bolts protruding ".

The "joining structure of vertical precast concrete members" shown in FIGS. 1 and 2 comprises a vertical precast concrete member 1 to be joined and a precast concrete member 2 having anchor bolts protruding therefrom.

The vertical precast concrete member 1
An anchor bolt through hole 4 is provided substantially vertically to the joint end surface 3, that is, an upward direction, and a concave portion 5 is provided from a side surface of the member so as to communicate with the anchor bolt through hole 4. I have.

In the embodiment shown in FIG. 1, the concave portion 5 does not penetrate the vertical precast concrete member 1, but may be an opening penetrating the vertical precast concrete member 1 for convenience of construction.

Around the recess 5 (or the opening), FIG.
As is more clearly shown, a reinforcing bar 6 is provided so as to surround the recess 5.

In the present specification, the expression “provided so as to surround the concave portion or the opening portion” with respect to the reinforcing bar 6 is as follows.
This means that the recess 5, in particular, the portion sandwiched by the bolts and nuts below the recess 5 is strongly integrated with the main body of the vertical precast concrete member 1.

The concrete arrangement method of the reinforcing bars 6 is as follows.
Any known method can be used as appropriate according to the strength required for the method.

The reinforcing bars of the present embodiment include two U-shaped reinforcing bars that literally surround the concave portion 5 and an anchor bolt penetrating so as to integrate the concave portion 5 with the main body of the vertical precast concrete member 1 in a strong manner. It comprises four anchor reinforcing bars 6 provided along the hole 4 in a direction orthogonal to the anchor bolt through hole 4.

At the upper end of the anchor bolt through hole 4, that is, the communicating portion with the recess 5, a nut washer 7 described later is provided.
Is provided. The washer 7 is also used to prevent the anchor bolt through hole 4 from being damaged by tightening the bolt and nut. The washer 7 can be appropriately replaced by another one.

The lower end of the anchor bolt through hole 4 preferably has a shape in which the lower part is expanded as shown in FIG. This is for simplifying the insertion of the anchor bolt by guiding the head of the anchor bolt when installing the vertical precast concrete member 1 as described later.

Reference numerals 8 and 9 indicate vertical and horizontal bars for reinforcing the main body of the vertical precast concrete member 1, respectively. These reinforcing bars are appropriately arranged according to the strength requirement of the member.

On the other hand, the precast concrete member 2
Has an anchor bolt 11 projecting substantially vertically from a joint end face 10 joined to the vertical precast concrete member 1.

The anchor bolt 11 has a base buried in the precast concrete member 2 so as to have a strength for supporting the vertical precast concrete member 1, or is integrated with the main reinforcement of the precast concrete member 2 as shown in FIG.

Reference numeral 12 denotes a holding bar that prevents the anchor bolt 11 from coming off and maintains the surface strength of the precast concrete member 2.

The head of the anchor bolt 11 has a nut 1
3 is screwed. A second washer 14 receiving the force of the nut is provided below the nut 13.

As shown in FIG. 1, after the construction, the concave portion 5 is filled with concrete or mortar 15.

The above is the configuration of the joining structure of the vertical precast concrete members according to the present embodiment. Next, a method of applying the joining structure will be described below.

In the joint structure of a vertical precast concrete member according to the present embodiment, the vertical precast concrete member 1 is suspended by a hoist and the like, and the anchor bolt is lowered onto the joint end face 10 of the precast concrete member 2 having the projecting anchor bolt. Through the anchor bolt through hole 4.

At this time, the expanded portion below the anchor bolt through hole 4 guides the head of the anchor bolt 11 as described above, and facilitates the insertion of the anchor bolt 11.

When the vertical precast concrete member 1 is lowered until the joining end face 3 of the vertical precast concrete member 1 comes into contact with the joining end face 10 of the precast concrete member 2 on which the anchor bolt is protruded, the head of the anchor bolt 11 enters the recess 5. Protrude.

Here, the upper end of the vertical precast concrete member 1 is continuously supported by a hoist, etc., while a washer 14 is fitted on the head of the anchor bolt 11 and the nut 13 is temporarily tightened. As a result of this temporary tightening, the vertical precast concrete member 1 is in a self-supporting state, so that the rope of the hoist can be removed.

In the same manner, when there is another vertical precast concrete member, the other vertical precast concrete member is installed, and the nut is temporarily tightened.

Next, these vertical precast concrete members are centered, and after confirming that the degree of verticality or the like falls within a specified value, the nut is fully tightened. Thereby, the joining operation is completed.

Finally, mortar or concrete 15 is supplemented to the concave portion 5 in order to prevent rust, fire resistance and aesthetics, and the head of the anchor bolt 11 and the nut 13 are embedded in the vertical precast concrete member 1. Further, if necessary, a groove at the joint surface between the vertical precast concrete member 1 and the precast concrete member 2 is formed with a sealing material 16.
Seal by.

With the above, the joining operation of the joining structure of the vertical precast concrete members according to the present invention is completely completed.

As described above, according to the present invention, the lifting and installation of the vertical precast concrete member 1 is a series of operations of the hoist, and the vertical precast concrete member 1 does not need to be vertically connected during the joining operation as in the case of the joining structure using the conventional sleeve or crimping joint. There is no need to separately provide a support for supporting the precast concrete member 1.

Further, since the joining operation is only required to tighten the nut, there is no need to perform an operation by a skilled worker such as a crimping sleeve or welding, and there is no need for a complicated grouting operation such as a mortar filling type sleeve. The operation can proceed extremely quickly, and the operation itself is simple.

Further, according to the present invention, since the nut is temporarily tightened as described above, and the centering and fine adjustment with other vertical precast concrete members can be performed, the final tightening operation can be performed. Unlike conventional wet joints, crimp sleeve joints, or mortar-filled sleeve joints that do not allow fine adjustment, beautifully arranged handrails and walls can be easily obtained when installing continuous vertical panels such as handrails and walls.

According to the joint structure for vertical precast concrete members of the present invention, the concrete or mortar 15 may be filled in the recess 5 after joining.
There is no need to overcoat concrete or mortar 15 over the entire upper surface of the wide joining step as in the conventional joint structure using bolts and nuts.

Further, according to the joint structure of a vertical precast concrete member of the present invention, a bolt for transmitting a stress
The nut is located inside the surface of structural strength that supports the weight of the vertical precast concrete member 1, so that a moment is not easily applied to the joint.

Further, since the concave portion or the opening is strongly integrated with the member main body by the reinforcing bar, a crack or the like is formed between the joining step portion and the member main body as compared with the conventional bolt / nut joint structure. And a highly reliable joining structure can be obtained.

Further, in the joining structure of the vertical precast concrete members of the present invention, the joining step does not protrude into the room after the joining as compared with the joining structure using the conventional bolts and nuts, and is not only aesthetically pleasing. The space use efficiency is high, and people do not trip.

[0080]

As is clear from the above description, the joining structure of the vertical precast concrete member of the present invention can be joined if the anchor bolt is located within the radius of the anchor bolt through hole. Compared with the joint structures such as crimp sleeves, welded joints, and threaded joints, the requirements for the production accuracy of the precast concrete members can be remarkably reduced. Thus, troubles at the construction site can be significantly reduced, and efficient construction work can be performed.

Further, according to the joining structure of the vertical precast concrete member of the present invention, the precast concrete member can be lifted, installed, and joined by a series of operations of the hoist, and the joining structure of the conventional crimping sleeve or the like or the mortar can be used. It does not take much time to exhibit the bonding strength unlike the filling type sleeve. For this reason, construction can proceed promptly, and the trouble of providing a temporary support can be omitted.

Further, in the joint structure of a vertical precast concrete member of the present invention, the fastening position of the bolt / nut is inside the precast concrete member, and the portion fastened by the bolt / nut is connected to the main body of the precast concrete member by a reinforcing bar. As it is integrated, compared to the conventional joint structure with bolts and nuts,
The joint has a shape in which a moment is unlikely to be applied, and high reliability in strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joining structure of a vertical precast concrete member according to an embodiment of the present invention.

FIG. 2 is another longitudinal sectional view of the joining structure of the vertical precast concrete member according to the embodiment of the present invention, viewed in the direction of arrow AA in FIG.

FIG. 3 is a longitudinal sectional view of a conventional vertical precast concrete member joining structure using a crimping sleeve.

FIG. 4 is a longitudinal sectional view of a conventional joint structure of a vertical precast concrete member using a mortar-filled sleeve.

FIG. 5 is a longitudinal sectional view of a conventional joint structure of a vertical precast concrete member by bolt and nut fastening.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vertical precast concrete member 2 Precast concrete member with anchor bolt projected 3 Joining end face 4 Anchor bolt through hole 5 Depression 6 Reinforcing bar 7 Washer 8 Vertical streak 9 Horizontal streak 10 Joining end surface 11 Anchor bolt 12 Presser bar 13 Nut 14 Washer 15 Concrete Or mortar 16 sealing material

Continued on the front page F term (reference) 2E125 AA52 AA53 AA57 AE02 AG08 AG13 AG23 AG31 AG60 BA01 BA22 BB08 BC02 BE07 BF04 CA04 CA09 CA16 CA82 EA01 EA16 EA33 EB01

Claims (1)

[Claims] 1. An anchor bolt through hole provided substantially perpendicularly to a joint end face toward the inside of a member, a recess or opening provided from a side surface of the member communicating with the anchor bolt through hole, A vertical precast concrete member having a reinforcing bar provided so as to surround the opening; and a precast concrete member having an anchor bolt projecting substantially perpendicularly to a joint end face, wherein the vertical precast concrete anchor bolt penetrates. The anchor bolt is inserted through the hole, and a nut is screwed tightly onto the head of the anchor bolt projecting into the recess or opening of the vertical precast concrete member, and the recess or opening of the vertical precast concrete member is made of concrete or Drops characterized by being supplemented with mortar Joint structure precast concrete member.