JP2979299B2 - Lithographic structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a planographic structure,
More specifically, the present invention relates to a planographic structure obtained by integrating a plurality of members by introducing a prestress.

[0002]

2. Description of the Related Art When constructing a planographic structure that spreads over a wide area such as a floor slab of a factory or a taxiway of an airport, it is not concrete cast in place to save labor, shorten the construction period, and improve quality. The construction method of precasting and constructing is adopted. When a wide-area planographic structure is constructed by the precast method in this way, joints between the precast members exist vertically and horizontally, but at this joint, reinforcing bars are buried so as to connect the ends of the precast plate and sealing is performed. The material is filled, thereby constructing an integrated planographic structure.

[0003]

However, the lithographic structure constructed by the above-mentioned conventional precast method has a problem that when a load is applied thereon, a large bending is apt to occur, which is inconvenient. However, even if it is relatively small, the opening of the joint cannot be suppressed, and further, there is a defect that the end portion is easily damaged due to the repeated opening.

[0004] In order to solve the above-mentioned defect at the joint, it has been proposed that a plurality of precast plates are integrally connected by a PC tendon to introduce prestress and a planographic structure is constructed. In order to connect, it is necessary to form a notch in the surface of the precast plate and fix both ends of the PC tendon material with this notch. Therefore, many notches will be formed on the surface of the precast plate, and when the planographic structure is extensive,
The joints intersect vertically and horizontally, and the tendon insertion duct and the notch for tension are densely intersected at this intersection. Therefore, in a wide range, it has not been practiced to construct a lithographic structure by introducing prestress using a PC tendon.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional connection structure, and its object is to prevent the occurrence of large bending and to suppress the opening of joints. Another object of the present invention is to provide a lithographic structure having good durability and spreading in a plane over a wide range.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a plurality of plate members having a plurality of PC tendon insertion ducts extending in a predetermined direction are communicated with the PC tendon insertion ducts. The first PC tendon is inserted into each of the communicating PC tendon insertion ducts,
By introducing a prestress by the first PC tendon, the plurality of plate members are integrated to form a plate member unit, and a plurality of the plate member units are arranged so that the edges are opposed to each other. A planographic structure is provided, wherein a second PC tendon is provided between opposing ends to introduce prestress, and adjacent plate units are integrated.

In the planographic structure of the present invention, one end of the second PC tendon is fixed at an end of one of the plate units at a fixing portion embedded therein without providing a cutout on the surface, It is preferable that the other end of the second PC tendon is fixed to a notch provided at an end of the other plate unit.

Further, in the planographic structure of the present invention, it is preferable that a predetermined second PC tendon of the plurality of second PC tendons is made of a flexible linear material,
As such a linear material, for example, steel wire, steel stranded wire,
There are high strength fiber materials such as cable or carbon fiber.

In the present invention, it is preferable that a plurality of PC tendon insertion ducts extend in parallel in a single plate. In addition, the number of plates constituting the plate unit, and the shape and dimensions of the plate can be integrated by introducing a prestress by the first PC tendon, so that the plate unit can be moved or arranged. It is sufficient if the workability is determined so that the workability is good. In particular, the shape of the plate is preferably formed in a long rectangular shape. When formed in such a long rectangular shape, it is preferable to extend the PC tendon insertion duct in the short side direction on the plate body. Further, in addition to the first and second PC tendon, the PC tendon insert is elongated. It is preferable to arrange another PC tendon in the side direction (long direction) and to introduce prestress also in this direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.
FIG. 1 is a plan view schematically showing the positional relationship between a plate body and a plate unit constituting the planographic structure of the present invention, and FIG. 2 shows the arrangement of a PC tension member and the like in the planographic structure of FIG. FIG. 3 is an enlarged plan view showing a joint portion between the even-angle portions of the plate unit shown in FIG. 2, and FIG.
(a) is a horizontal sectional view of a fixing portion of the first PC tendon, FIG. 4 (b) is an end view of the fixing portion, and FIG. 5 is an arrangement structure of the second PC tendon. FIG. 6 is a plan view showing a taxiway of an airfield repaired by using the planographic structure of the present invention.

In FIG. 1, three long rectangular plates 21a, 21b and 21c are arranged so as to abut on their long sides, and these are integrated to form a plate unit 21. And plate units 22, 23, 24, 25, 25,
26 are sequentially arranged, and these plate body units 21, 22,
23, 24, 25 and 26 are integrated, and the planographic structure 2
0 is formed.

Here, each of the plate units 21, 22, 22
A plurality of sheath tubes (sheath tubes 35 in FIG. 4) as PC tendon insertion ducts are embedded in advance in the respective plates constituting the members 23, 24, 25, and 26 so as to extend in parallel in the Y direction in the figure. The sheath tubes of the three plate members are arranged so as to communicate with each other. Although the sheath tube 35 is omitted in FIG. 2 for simplification of the drawing, the first PC tendon 31 is inserted into each of the sheath tubes 35 communicating the three plates. The first PC tendon material 31 is fixed at fixing portions 30 formed at predetermined positions on both sides of each plate unit.

That is, at both ends of each plate unit,
As shown in FIG. 4, a notch 33 is recessed so as to communicate with each sheath tube 35, and a supporting plate 32 having a through hole is buried in the bottom of the notch 33 in advance to form the fixing portion 30. Have been. In the fixing unit 30, a first PC tension member 31 is inserted into the sheath tube 35 through a through hole of the support plate 32, and screw-type grips (not shown) formed at both ends of the first PC tension member 31 are provided. ), A nut 34 is screwed in, and the first PC tension member 31 is tensioned while tightening the nut 34, whereby prestress is introduced to integrate the three plate members, and each plate unit 21 , 22,23,2
4, 25, 26 are formed.

The plurality of plate units 21, 22, 22
23, 24, 25 and 26 are joints 28 shown in FIG.
a, 28b, 27a, 27b, 27c are integrated by the connecting structure 10 as shown in FIG. That is, one end of the second PC tendon member 16 is fixed by the fixing portion, that is, the spring-type grip 12 embedded therein without providing a notch portion on the end surface of one plate body unit, and The other end of the PC tendon is fixed in a notch 17 provided at the end of the other plate unit.

Here, referring to FIG. 1 and FIG.
The connection structure 10 will be described in more detail with reference to the example in FIG. That is, the plate members 21c, 2c sandwich the joint 28a.
2a are arranged to face each other, and one plate 21
c, a spring type grip 12 for fixing the second PC tendon 16 and a supporting plate 15a are embedded in advance without forming a cutout on the surface thereof. The sheath tube 13a is previously extended to the joint 28a through the hole of the support plate 15a. The other plate body 22a is provided with a notch 17 in advance on the surface thereof, and the notch 17 is jointed with the sheath tube 13b via a perforated supporting plate 15b so as to communicate with the sheath tube 13a. It extends in advance to 28a.
In the plate bodies 21c and 22a, the second PC tendon 1
The PC stranded wire as 6 is inserted into the sheath tube 13b from the notch 17 through the support plate 15b.
The tip is inserted into the spring-type grip 12 via 3a, and the nut 14 is screwed into the screw-type grip 16 'provided at the end thereof while applying tension to the second PC tension member 16, and is fixed. Thereby, the connection structure 10 is formed. As shown in FIG. 2, the connecting structure 10 may be configured such that the notches 17 and the spring-type grips 12 are alternately provided on different plate sides for each adjacent one. Which side of the plate body is provided with the spring grip 12 may be appropriately determined for each corner connection structure.

At the joint between the even angles of the plate unit, as shown in the enlarged view of FIG. 3, four plate units 21, 22, 24, 25 (ie, four plate members 21).
c, 22a, 24c, and 25a) are abutted at each of the even-angled portions, and are arranged so that the joints become crosses. In the even-angle portions of the respective plates 21c, 22a, 24c, and 25a in FIG.
The notch 17 of the connecting structure provided at the joint in the Y direction and the notch 17 of the connecting structure provided at the joint in the X direction are arranged so as not to overlap. Further, the second PC tendon 16A is arranged in a curved shape so that the second PC tendon 16A does not penetrate the notch 17 for connecting the joint in the X direction, and the spring-type grip 12 And do not intersect.

In the planographic structure 20 formed as described above, the first PC tendon 31 and the second PC tendon 16 provide a continuous prestress over the entire length of the planographic structure 20 in the Y direction. The lithographic structure 20
Large bending in the Y direction can be prevented, and joints 28a, 28b, 27a, 27b, 27
It is possible to suppress the opening of c.

A sealing material 19 is sandwiched between joints 28a of the plate bodies 21c and 22a, so that a grout material such as mortar to be filled in the joints 28a is a sheath tube 13a, 1a.
3b to prevent the sheath tubes 13a, 13
The unbonded state of the second tendon 16 in the area b is maintained. Also, the first and second tendon members 31, 1 are provided on each plate.
A plurality of PC tendons different from 6 are embedded in advance so as to extend in parallel with the X direction.
Prestress is also introduced in the direction. The PC tendons thus arranged in the X direction and the joints 27a, 27b, 27
Since the second PC tendon 16 provided in (c) introduces the prestress so as to be continuous over the entire length in the X direction, it prevents the planographic structure 20 from being largely bent in the X direction. be able to. Further, in the spring-type grip 12, a wedge 12b formed in a shape complementary to the taper is inserted into a sleeve 12a having an inner surface formed in a tapered shape.
2b is divided into a plurality of members, and the second PC
It has an insertion hole for the tendon 16. And wedge 12b
A spring 12c is disposed at the large-diameter end of the spring.
A spring cap 12d is fitted so as to seal the end of the sleeve 12a. Therefore, in FIG.
When the tip of the second PC tendon 16 is pushed into
The wedge 12b is pushed and opened while compressing the spring 12c, and the tip of the second PC tendon 16 is inserted into the center hole. Then, when the operation of pushing the second PC tendon 16 is stopped, the wedge 12b is pushed back by the spring 12c, the central hole is reduced in diameter, and the second PC tendon 16 is stopped.
Hold the tip of.

Next, an example in which the planographic structure 20 of the present invention is applied to a repair structure for a planographic structure that spreads over a wide area such as a floor slab of a factory or a taxiway of an airfield, etc.
This will be described with reference to FIG. In FIG. 6 (a), shoulders are provided on both sides of the taxiway body at the airport, and the lithographic structure can be applied to repair the taxiway body.
As shown in FIG. 6 (b), a predetermined portion of the guideway main body is cut, and a plate unit is fitted and temporarily installed. Under the temporary plate unit, an intermediate layer (not shown) made of asphalt is formed with a thickness of 4 cm. Depending on the cutting depth of the repair portion of the guideway main body, the intermediate layer is formed on the asphalt intermediate layer. Lay a 2 cm thick rubber mat. Similarly, as shown in FIG. 6 (c), the plate units are arranged and temporarily installed, and when the number of plate units reaches a predetermined number or more, the predetermined plate unit is appropriately removed and another plate is placed at the same position. A body unit, that is, a permanent plate unit is arranged. A vinyl film with a thickness of about 0.05 to 0.15 mm is laid beforehand under the main plate unit, and a backing material such as mortar is injected between the vinyl film and the main plate unit. Then, grout such as mortar is injected into the joint. Then, when the pre-stress is introduced between the permanent plate units adjacent to each other via the joint using the second tension member and integrated, a planographic structure is formed. In this lithographic structure, by sequentially adding plate units, the lithographic structure can be applied to repair of a lithographic structure that spreads in a plane over a wide range or to new construction.

[0020]

According to the planographic structure of the present invention, a first PC tendon is inserted into a plurality of PC tendon insertion ducts of a plurality of plates, and prestress is introduced by the first PC tendon. By this, a plurality of plate units are integrated to form a plate unit, and a plurality of the plate units are connected in series,
A second PC tendon was provided between the opposing edges to introduce prestress, and the adjacent plate units were integrally formed. Therefore, since the first PC tendon and the second PC tendon are used to introduce the prestress continuously over the entire surface of the planographic structure, it is possible to prevent the planographic structure from being largely bent. And opening of joints can be suppressed.

In the planographic structure of the present invention, one end of the second PC tendon material is fixed at the end of one of the plate units at the fixing portion embedded therein without providing a cutout on the surface. The other end of the second PC tendon was fixed to a notch provided on the end surface of the other plate unit. Therefore, the number of cutouts for fixing the second PC tendon is PC
It can be greatly reduced as compared with the conventional connecting structure in which notches are provided at both ends of the tendon material, and even at the joint where the even-angled portions of the plate unit are joined together, the notch, the fixing portion, and the PC tension A layout that does not intersect with the material insertion duct becomes possible, and therefore, a lithographic structure with good durability that can be freely combined with a plate unit and spreads over a wide area in a planar manner can be constructed.

In the planographic structure of the present invention, the predetermined second PC tendon member among the plurality of second PC tendon members is made of a flexible linear material. In the joint portion where the even-angled portions are joined to each other, a layout in which the cutout portion does not intersect with the fixing portion and the PC tendon insertion duct can be more easily formed.

[Brief description of the drawings]

FIG. 1 is a simplified plan view of a planographic structure of the present invention.

FIG. 2 is a plan view showing an arrangement of a PC tendon and the like in a planographic structure.

FIG. 3 is an enlarged plan view showing a joint portion between even-angle portions of the plate unit.

FIG. 4A is a horizontal sectional view of a fixing portion of a first PC tendon material, and FIG. 4B is an end view of the fixing portion.

FIG. 5 is a sectional view showing an arrangement structure of a second PC tendon member.

FIG. 6 is a plan view showing a taxiway of an airfield repaired using the planographic structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Dead anchor (anchoring part) 16 2nd PC tension member 17 Notch (notch part) 20 Lithographic structure 21,22,23,24,25,26 Plate unit 21a, 21b, 21c Plate 31 First PC tendon 35 sheath tube (PC tendon insertion duct)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoichi Abe 283-1-3-203 Owada, Yachiyo-shi, Chiba (72) Inventor Shoichi Kameda 1-724, Sanrizuka, Narita-shi, Chiba 17-17 Building No. 5 (72) Invention Person: Kudo Sadatoshi 2-1-1, Hirakawacho, Chiyoda-ku, Tokyo Oriental Construction Co., Ltd. (72) Inventor Kazuo Kai 2-1-1, Hirakawacho, Chiyoda-ku, Tokyo: Oriental Construction Co., Ltd. (72) Inventor Takahiro Miura 2-1-1, Hirakawa-cho, Chiyoda-ku, Tokyo Oriental Construction Co., Ltd. (56) References JP-A-7-42245 (JP, A) JP40-40302 (JP, B1) (58) Survey Field (Int.Cl. ⁶ , DB name) E04B 1/60 503 E04B 5/02 E04B 5/43 E04G 21/12

Claims (2)

(57) [Claims] 1. A plurality of plate members having a plurality of PC tendon insertion ducts extending in a predetermined direction are arranged so that the PC tendon insertion ducts communicate with each other, and each of the communicated PC tendon insertion ducts is provided. Then, a first PC tendon is inserted, and a prestress is introduced by the first PC tendon to integrate the plurality of plate members to form a plate unit. end side is arranged so as to face, in this between opposing end side provided with a second PC tendon and prestressing lithographic structure integrated adjacent the plate member unit each other, the first One end of the second PC tendon is connected to one plate unit.
Embedded inside without notches on the surface at the end
The other end of the second PC tendon is fixed at the fixing unit,
Fixed to the notch provided at the end of the plate unit
A lithographic structure, characterized in that: 2. The planographic structure according to claim 1 , wherein a predetermined second PC tendon of the plurality of second PC tendons is made of a flexible linear material.