JP3121152B2 - Buried connecting member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC plate driving formwork method in which, for example, a thin precast plate (hereinafter referred to as a PC plate) is used as a form for driving and forming concrete columns and beams. The present invention relates to an embedded connecting member used for connecting the PC plates in a bendable manner.

[0002]

2. Description of the Related Art Conventionally, when a concrete structure is constructed by on-site construction, usually, a single-material formwork such as a wooden board or a steel plate is assembled by a formwork, and after a necessary reinforcing arrangement is provided in the formwork, the concrete is formed. After the cast concrete exhibits a predetermined strength, the form is dismantled and the form is diverted or diverted. However, in such a method, it is necessary to assemble with a formwork in accordance with the shape of the concrete structure, and further disassemble the work, and due to a chronic shortage of construction workers, sufficient workers can be secured. In addition, there is a problem in quality assurance, safety management, etc. due to inexperience of workers.

[0003] In the construction of such a structure, a hollow precast concrete formwork in which the outside portions of the columns and beams of the structural frame or a part of the outside portions are made of concrete is carried into the site, and the necessary form is put in the formwork. Semi-PC hollow formwork in which concrete is cast after the arrangement of the reinforcing bars is applied. However, in the present situation where a large number of types and a small number of structural members are required, there has been a problem that the number of types of molds required for manufacturing a half-PC hollow mold increases and the manufacturing cost increases. Therefore, in order to rationalize the manufacturing method of the half-PC hollow formwork, P
The C plates are connected to each other using a hinge-type metal band (Japanese Patent Application Laid-Open No. 2-167960) or a molded plate-like body with a buried element of a protruding rail (Japanese Patent Application No. 3-033680).
Methods for assembling three-dimensional forms such as required columns and beams have been proposed.

[0004]

Among the conventional buried connecting members, a hinge-type metal band has good flexibility before embedding in a connected member such as a PC plate, but after embedding, for example, concrete A part of the constituent material of the connected member flows into the bending fulcrum and hardens, so that the flexibility is impaired. Moreover, between the two connected members,
Since there is a break in the movable part of the hinge, there is also a problem in the sealing performance.

[0005] On the other hand, in the case of a molded strip having a base portion in the form of a molded plate, there is no such a problem.
At the time of finishing work such as putty work, adhesive work, and mortar work, the adhesion of paint and putty is poor, so that the bonding strength of the finish material cannot be sufficiently obtained. In addition, the gloss etc. are significantly different from concrete, so that the appearance unevenness of the finish with the adjacent PC plate surface appears, or the weather resistance is inferior to concrete, so cracks will occur due to long-term use, etc. It was insufficient for use as interior and exterior surfaces.

The present invention has been made in view of the above-mentioned circumstances, and can firmly connect two members to be connected without deteriorating the bendability and with an appropriate sealing property and good appearance. In particular, it is an object of the present invention to provide a buried connecting member that can significantly improve the finish workability of a structural part using a plate-like member after the site driving work.

[0007]

In order to achieve the above object, a buried connecting member according to the present invention connects at least one of two connected members made of a hardening or solidifying plate member. The joint to be joined to the plate-like member includes a base located on the surface of the plate-like member, and a number of embedded elements extending from the base to the inside of the plate-like member. The plate-shaped member is integrally hardened or solidified and joined to a part of the base and the embedded element in a state where the embedded connecting member is embedded. The connecting portion, which is located between the connecting portions of the buried connecting member and the member to be connected and connects the two connecting portions, and the base portion has a ground weave portion of a single yarn 3 to
A 50 denier multi-thread is used, and the pitch of the ground thread is set to 0.
3 mm or more and 2.5 mm or less, and the opening width between ground yarns is 1.5
mm or less, and the connecting portion is deformable in the bending direction.
Here, the term "curable" refers to a property of being cured by a reaction such as hydraulic property or air-hardening property, and the term "solidifying property" refers to a property of being solidified by the flow of water or heat.

[0008]

According to the above construction, the joint to be joined to the two plate-like members comprises a base located on the surface of the plate-like member and a number of embedded elements extending from the base to the inside of the plate-like member. Because of this, it is possible to tightly adhere this joint to the plate-like member and join it. Moreover since the connecting portion and the base is constituted by tetrahedral fiber knitted woven structure, it is possible to a continuous tape-like, it can be appropriately kept sealed by eliminating cuts and appearance to be It can be neatly joined. Further, since the base portion and the coupling portion is constituted by a tetrahedral integral fiber knitted woven structure, connecting portion for connecting the two junctions as a connecting member for two of the coupling members, kept moderate flexibility. The most distinctive feature is that the base and the connecting part are composed of a unitary fiber knitted and woven structure, so that the mortar liquid penetrates into the outer surface of the buried connecting member. Good finish workability by painting, putty, mortar, etc. after driving in, and a good appearance without finish spots on the surface of the adjacent plate-like member is obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part showing a state in which two connected members 1A and 1B are connected by a symmetrical embedded connecting member 2 according to the first embodiment. In the figure,
1A and 1B are PC plates as an example of a member to be connected made of a plate-shaped member. These PC plates 1A and 1B usually have a thickness T.
8 to 50 mm is used, and is hardened in a state where the embedded connecting member 2 is embedded. The buried connecting member 2 includes:
Left and right joints 3, 3 joined to the PC plates 1A, 1B, respectively, and a joint 4 for joining the two joints 3, 3
Consists of The left and right joints 3 are PC versions 1A, 1B
Base 5 located along the surface of the
A buried element 6 extending inward of the plates 1A, 1B. The PC plates 1A and 1B are integrally hardened (or solidified) with the embedded element 6 and a part of the base 5 in a state where the embedded connecting member 2 is embedded, and are joined to the embedded connecting member 2.

The PC plate 1A in the buried connecting member 2
The connecting portion 4 is located between the joining portions with the connecting portion 1B. The connecting portion 4 and the bases 5 and 5 are formed of a unitary body or a nonwoven fabric of a fiber woven structure, and the connecting portion 4 is bendable. In order to avoid interference when bending in the direction of arrow A, inclined surfaces 1 are provided at the ends of the PC plates 1A and 1B.
a and 1b are formed. The PC plates 1A and 1B are provided with a reinforcing net 10.

The face of the fiber knitted structure may be formed of an inorganic material such as a metal fiber, but preferably, a face of a flexible resin fiber knitted structure is used. The face body of this fiber woven structure is similar to the woven structure of a commercially available hook-and-loop fastener, such as Velcro (registered trademark) and Magic Touch (registered trademark). The fiber element is used for the base 5 and the buried element 6 is plain-woven and Russell. It is most preferable that they are integrally woven and woven by weaving or knitting. The embedded element 6 is
As shown in the perspective view of FIG. 2 (a), the entire surface is laid in a group row on the buried surface 5a of the base 5.

The strength of the buried connecting member 2 and the buried strength (PC
Adhesion to the plate) is important for the connection performance.
A, 1B is selected depending on the application, structure, size, and the like. In the case of PC plate connection used for beams, columns, etc. of ordinary reinforced concrete buildings, the tensile strength of the base 5 is 2 kg / cm or more and 100 kg / cm or less, and the burial strength is 1 kg / peel strength. cm or more, preferably 2 kg / cm or more. If the tensile strength is not more than 2 kg / cm, it is easy to break, and the correlation retention between the two PC plates 1A and 1B is low. On the other hand, if the tensile strength is 100 kg / cm or more, not only is the strength excessive, which leads to an increase in cost, but also the base becomes thicker or harder, impairing the flexibility. If the peel strength is 1 kg / cm or less, the embedded connecting member 2 peels off during assembly. The tape width W of the embedded connecting member 2 to be used is usually 40 mm to 200 mm.

The PC plates 1A, 1B and the buried connecting member 2 shown in FIG.
Is mainly connected by the buried element 6,
In order to increase the bonding strength between the two, the size and arrangement of the buried elements 6 are important factors in order to enhance the bonding between the base 5 and the PC plates 1A and 1B. Here, the size and arrangement of the buried elements 6 are selected based on the shape of the buried elements 6 and the like.

For example, in the case of a monofilament loop yarn or a PC plate for general construction in which the end of a monofilament is processed into a mash shape (mushroom shape), the height of the embedded element 6 is 8 mm or less, preferably 1 to 5 mm. And If the height of the buried element 6 is 8 mm or more, the buried element 6 tends to fall down, while if it is 1 mm or less, the anchor effect is too low. Array pitch is 1
The pitch is preferably 0 mm or less, more preferably 0.5 mm to 5 mm. By burying the buried elements 6 more finely, a uniform and powerful embedding becomes possible.
In addition, there is a concern that the penetration of the molding liquids A and 1B may be deteriorated, the embedding force may be reduced, and skin separation may occur at the embedding portion (joining portion 3). It is not preferable in terms of cost. The limit for densely implanting the buried element 6 is shown in FIG.
As shown in (b), usually, the total cross-sectional area S1 of the member of the buried element 6 at an arbitrary cross section along the buried connecting member 2 is:
It is necessary that the area is not more than 20% of the total sectional area S2.
It is preferably set to 0% or less.

The fibers used for the buried connecting member 2 of the general building PC plate, although depending on the application, are usually multifilament yarns whose ground weave (ground) has a single yarn of 3 to 50 dr. The base constituting the face body of the fiber knitting structure is shown in FIG.
As shown in (c), the pitch P of the ground yarn 2c is 0.3 mm.
As described above, the width is preferably 2.5 mm or less, and it is preferable that the opening width W1 between the ground yarns 2c has an appropriate gap having a water permeability of 1.5 mm or less. If there is no gap, the mortar liquid does not penetrate, while if it is 1.5 mm or more, the mortar liquid rises out, and the mortar liquid solidifies into a thin film on the finishing surface 2a of the base 5 in FIG. is there.

As the fiber element of the buried element 6, the PC plate 1
From the viewpoint of making it difficult to come off when molding A and 1B, 10
A thick denier monofilament of 0 dr to 2000 dr or a multi-thread of 5 dr to 350 dr is integrally woven into the base portion 5 and processed by plain weaving, Russell weaving, kami weaving or the like.
This is because, in the case of a monofilament, if it is 100 dr or less, the buried element 6 easily falls down, while if it is 2000 dr or more, weaving becomes difficult. The buried element 6 of the base 5 may be made of different denier, a plurality of different fibers or composite fibers,
Or you may change and combine a woven prescription.

The fibers used in the buried connecting member 2 may be inorganic or metal fibers, but are preferably organic fibers, and are used as a part of a normal building structure. , Heat resistance and water resistance are required. Also, P
Since it is embedded in the C-plates 1A and 1B, it is important to have alkali resistance, and vinylon fiber, aramid fiber, polyolefin, or alkali-resistant polyester, nylon or composite fiber is used. Particularly, vinylon fiber is more preferably used because it has excellent alkali resistance and good bondability to cement. The fiber and the woven structure may be changed between the connecting portion 4 and the joining portion 3.

The buried connecting member 2 is integrally buried in the PC plates 1A and 1B, and is used after finishing as an external surface of the structure, so that not only the burying property of the buried element 6 but also the base 5 ( The permeability (flowability) and affinity (adhesion) of the concrete liquid into the fabric part) is important, and the outer surface 1c of the PC plates 1A and 1B that is not covered with the buried connecting member 2 has a lower surface. It is important that there is little difference between the state and the adhesiveness. In order to obtain a higher degree of integration, it is preferable that moderately small air holes are provided not only at the gaps between the embedded elements 6 but also at the fiber joints of the woven base 5. Therefore, it is necessary to minimize the amount of seal coating or the like in which a polyurethane emulsion or the like is applied from the side of the base 5 opposite to the buried element 6 (finished surface 2a) in order to prevent the buried element 6 from coming off from the base 5. preferable. Even if the weaving state is slightly loose, it is sufficiently fixed when the PC plates 1A and 1B and the buried connecting member 2 are integrated. Also, the connected PC version 1A, 1
Even when B is constructed on the site as a structure, the slight ventilation of the connecting portion 4 is preferable because the residual gas in the poured concrete form escapes through the connecting portion 4.

[0019] Thus, by tetrahedral fiber knitted woven structure having gas permeability, since it is configured with the base 5 and the connecting portion 4, the concrete solution to finish surface 2a of the embedded coupling member 2 comes viewed reasonably immersion. Therefore, the finishing surface 2a of the buried connecting member 2 is P
Since the outer surfaces 1c of the C-plates 1A and 1B are in a state close to the outer surfaces 1c, it is possible to apply the same coating and primer treatment to both surfaces 1c and 2a. , 1B has a texture similar to that of the outer surface 1c, so that appearance irregularities are less likely to appear. As a result, the durability and appearance of the finish are improved.

The buried connecting member 2 is made of a PC plate 1A, 1
In the state embedded in B, since it is hardened and joined integrally with a part of the base 5 and the embedded element 6, the PC plates 1A, 1
The fixability to B is also excellent.

Next, another example of the buried connecting member 2 will be described. FIG. 3A shows an example in which the buried elements 6 are arranged on the entire surface including the connecting portion 4, and the buried elements 6 are arranged by knitting the filament loops of the fiber elements in the fiber woven fabric of the base 5. . The embedded element 6 of the connecting portion 4 is P
At the time of molding the C plate, it is pressed and molded by a molding die.

FIG. 3B shows a buried element 6 in which a multifilament is woven into a loop. Normal,
A single yarn of 5 to 350 dr is used in a plurality. Note that the multifilament may be in a pile shape. FIG. 3 (c)
In the figure, a filament system is woven into a buried element 6 in a hook shape.

FIG. 3D shows a structure in which a monofilament single yarn is knitted in the buried element 6 and the tip is formed into a mash shape similar to the head of a match stick. Usually 100dr-2
A 000 dr monofilament yarn is used. In this case, as shown in FIG. 3 (e), a plurality of filament yarns may be used, and an uncut pile-shaped filament can be heated and deformed to obtain an embedding effect. FIG. 3F shows a brush formed by planting a large number of multifilament fibers on the base 5.

FIG. 3 (g) shows a structure in which a large number of loop-shaped finishing elements 11 are arranged on the opposite side of the buried surface 2b, that is, on the finishing surface 2a in order to improve putty finishing, mortar finishing, adhesive finishing and the like. is there. The finishing element 11 may be a pile-like, brush-like, fluffy, or mash-like finishing element. The finishing element 11 is provided with an element having an appropriate material, configuration, and size according to the application, such as a paint finish, a putty finish, an adhesive finish, and a mortar finish. However, a thinner element than the buried element 6 is usually used. , To increase its density.

FIG. 3 (h) shows a state in which a contact sheet 8 is provided on the embedded side (embedding surface 2b) of the connecting portion 4, and the non-bonded or joined non-woven sheet or sponge-like sheet is used. And so on. Accordingly, excessive leakage of the poured concrete liquid from the connecting portion 4 and leaching of the sealing agent from the connecting portion 4 can be prevented, and furthermore, shape retention can be enhanced while maintaining a state of being easily bent.

FIG. 3 (i) shows the finished surface 2 of the buried connecting member 2.
The finishing sheet 9 made of a net sheet is disposed on the side a. FIG. 3 (j) shows a buried element 6 formed by gathering a net-like object, which is provided on the woven fabric of the base 5 by sewing or the like. The mesh is preferably about 2 to 30 mesh.

[0027]

Next, a concrete example of the driving formwork method using the connected PC plate connected as described above will be described.
FIG. 4A is a cross-sectional view when applied to a pillar. In this drawing, first, a PC plate connected body in which four PC plates 1A to 1D are connected by three embedded connecting members 2 is bent at a right angle at a connecting portion 4 of each embedded connecting member 2, respectively, and viewed in plan. By assembling a rectangular formwork, a square concrete driving space 7 is formed. Then
Concrete is poured into this space 7, or concrete is poured in after arranging the reinforcing bars, thereby forming predetermined concrete columns or reinforced concrete columns. Thereafter, finishing work is performed on the outer surfaces of the buried connecting member 2 and the PC plates 1A to 1D. Fig. 4 (b)
As shown in the figure, the three PC plates 1A to 1C are connected by the two buried connecting members 2, and the U-shaped PC plate connecting half H in plan view.
May be connected by another joint structure 15.
Note that another joint structure 15 is, for example, a PC version 1
The connecting plate 16 embedded in B, 1C is fastened with bolts 17 and nuts 18.

As described above, the shape and arrangement of the embedded elements 6 are important for the bonding strength between the embedded connecting member 2 and the PC plates 1A and 1B in FIG.
In order to improve the bonding force with the buried connecting member 2,
It is effective to apply an adhesive or a pressure-sensitive adhesive to the embedded surface 2b, perform a primer treatment, or attach another member.

The buried connecting member 2 is not limited to a symmetrical shape with respect to the connecting portion 4 to be bent. Depending on the purpose and application, the shape and structure of the buried connecting member 2 and the number and shape of the buried elements 6 are different. It may be different.

In the above embodiment, as the two connected members, hydraulic PC plates 1A, 1A constituting the driving formwork are used.
Although B was used, for example, it is also possible to use it for connecting other hydraulic plate-like members such as plaster, mortar, clay, and plaster. It may be used for connecting a plate-shaped member made of a material having a solidifying property due to the flow of water or heat, for example, a synthetic resin or a metal. In short, a hardening or solidifying member can be used as the plate-shaped member of the present invention because the embedded element 6 can be embedded, but a material such as wood having neither hardening nor hardening is a plate-shaped member. Can not be used as

The PC plate shown in each of the above embodiments can also be used as a base material and a finishing material. The main purpose of the buried connecting member 2 of the present invention is to form various types of civil engineering and concrete structures using concrete, such as beams, columns, walls, stairs, curtain walls, crosses, foundations, ducts, floors, etc. This is the connection of plate-shaped members used as molds.

[0033]

As described above, according to the present invention, the buried connecting member can be firmly adhered to and joined to the plate-like member, and the appropriate flexibility as the connecting material can be obtained. In particular, since the base portion and the coupling portion is constituted by tetrahedral fiber knitted woven structure, to the outer surface of the buried connection member retains a moderate sealing property since such mortar solution penetrates, finish similar to the plate-like member construction Therefore, a neat appearance with the same appearance as that of the plate-like member and no uneven feeling can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which two PC plates are connected to each other by an embedded connecting member according to a first embodiment of the present invention.

2A is a perspective view of an embedded connecting member, FIG. 2B is an enlarged sectional view of the same, and FIG. 2C is an enlarged perspective view of a fiber knitting base.

FIG. 3 is a sectional view showing another example of the buried connecting member.

FIG. 4 is a cross-sectional view illustrating a driving formwork method using a PC plate connected body.

[Explanation of symbols]

1A to 1D: connected member, 2: buried connecting member, 3: joining portion, 4 ... connecting portion, 5: base portion, 6: buried element.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sumio Hattori 3-8-2 Nihonbashi, Chuo-ku, Tokyo Inside Kuraray Co., Ltd. (72) Inventor Miki Aoyama 4-640 Shimoseito, Kiyose-shi, Tokyo Obayashi Corporation Within the Technical Research Institute (72) Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. In-house (56) References JP-A-64-6462 (JP, A) JP-A-4-247137 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/16 E04G 9 / 00-9/10

Claims (1)

(57) [Claims] 1. A buried connecting member for connecting two members to be connected, at least one of which is a curable or solidifying plate-like member, wherein the joining portion joined to the plate-like member is the plate-like member. A plurality of buried elements extending from the base to the inside of the plate-shaped member, wherein the plate-shaped member includes a part of the base and the buried member in a state where the buried connecting member is buried. element and is integrally cured or solidified and joined, and a connecting portion for connecting the two joints located between the junction of the member to be connected in the embedded coupling member, and the said base, the ground
Use a multi-thread yarn of 3-50 denier single yarn as ground yarn as yarn
The pitch of this ground yarn is 0.3mm or more and 2.5mm or less
And a fiber woven structure having an opening width between ground yarns of 1.5 mm or less.
A buried connecting member which is made of a structural body and wherein the connecting portion is deformable in a bending direction.