JP2637900B2 - Method of manufacturing outer cable structure and outer cable structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an outer cable structure used for a road bridge and the like and an outer cable structure.

[0002]

2. Description of the Related Art Recently, an outer cable structure is sometimes used in a road bridge or the like. As shown in FIG. 18, the outer cable structure includes an upper deck 101, a lower deck 103, and a side deck 1.
05, 107, a side plate 105 of a concrete frame body,
A tension member 109 is provided between 107, the central portion of the tension member 109 is fixed to the lower floor slab 109 by a deviator 111, and the tension member 109 is pulled from the outside of the side plate 105 by a jack 113. Reference numeral 110 denotes a fixing device.

[0003] Alternatively, as shown in FIG. 19, two concrete structures 115, 117 which are finally integrated.
And the two structures 115 and 117 are pushed open by the jack 121, and the jack space 123
Concrete is poured into the concrete to obtain an outer cable structure.
Reference numeral 121 denotes a fixing device.

[0004]

However, when the outer cable structure is to be manufactured by the former method,
A strong pulling force must be applied by the jack 113 from the outside of the side plate 105, and it is necessary to secure a wide working space for the jack 113 and the like. In the latter case, a large-scale device is required, and the integrity of the concrete to be cast later and the original concrete structure cannot be guaranteed. The present invention
It was made in view of such a problem, and the purpose thereof is that a large work space is not required outside the structure, and it can also be used when constructing a continuous girder or the like,
An object of the present invention is to provide an outer cable structure in which the integrity of concrete is ensured and a method for manufacturing the same.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a step of fixing both ends of a tendon material to both side plates of a concrete frame comprising an upper floor plate, a lower floor plate, and a side plate;
(B) pulling the vicinity of the center of the tendon toward the lower slab,
And a step of fixing the outer cable structure to a lower floor slab, and an outer cable structure obtained by the method.

[0006]

According to the present invention, most of the work can be performed in the space of the structure, and a large work space is not required outside the outer cable structure. In addition, the integrity of the structure can be guaranteed.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a concrete frame of an outer cable structure according to a first embodiment of the present invention. The concrete frame is composed of an upper slab 1, a lower slab 3, a side slab 5, 7
Consists of A boxless portion 9 is provided above the side plate 5. Side plate 7
A boxless part 10 is provided above the
1. A ram chair 13 and a jack 15 are provided. In addition, 8
Is a fiber reinforced plastic for reinforcement (FRP, Fiber Rein
forced Plastic).

FIG. 2 is an enlarged view of the vicinity of the boxless portion 9, in which a plastic guide 17 as shown in FIG. As shown in FIG. 3, a large number of grooves 20 are formed in the guide 17, and FRP
19 is inserted.

As shown in FIG. 2, a plurality of FRPs 19 are arranged in the boxless section 9. Then, as shown in FIG. 4, each FRP 19 is passed through the holes 25 of the concrete block (deviator) 23 provided with the plurality of holes 25. Reference numeral 24 denotes a bolt hole for fixing the concrete block 23 to the lower slab 3.

Next, after passing the FRP 19 through the concrete block 23 as shown in FIG. 5, mortar or epoxy resin is poured into the boxless portion 9 as shown in FIG.
Fix P19.

As shown in FIG. 5, after moving the concrete block 23 to the fixing side, one FRP is connected to the jack 15.

FIG. 6 is an enlarged view of the vicinity of the jack 15. A plate 11 is fixed to the side plate 7, and this plate 1
1 is provided with a ram chair 13, and the ram chair 13 is provided with a jack 15.

FIG. 7 is a sectional view of the plate 11. The plate 11 has a two-layer structure so that it can be cut at the AA plane later. As shown in FIG. 6, one FRP 19 is connected to the jack 15, and the FRP 19 is pulled by the jack 15,
A predetermined initial tension is applied to the FRP 19, and the wedge 27
Fix RP19. When one FRP 19 has been fixed with the wedge 27, the next FRP 19 is connected to the jack 15 to give an initial tension similarly, and fixed with the wedge 27.
When the initial tension is applied to all the FRPs 19 in this manner, mortar, epoxy resin, or the like is poured into the boxless portion 10 to perform fixing. When the mortar etc. hardens,
The FRP 19 is cut together with the plate 11 on the AA plane in FIG.

Next, as shown in FIG. 8, a jack 31 is provided on the lower surface of the upper slab 1 and the concrete block 23 is pressed by the jack 31. As shown in FIG. 9, when the concrete block 23 is pressed by the jack 31 and the concrete block 23 contacts the lower slab 3, a bolt is passed through the hole 24 of the concrete block 23, and the concrete block 23 is connected to the lower slab 3 by the bolt. Fix it. Then, the jack 31 is removed.

FIG. 10 is an explanatory diagram for calculating the final tension P of the FRP 19, where C1 is the FRP1 in the initial state.
9, and C2 indicates the FRP 19 fixed to the lower floor slab 3 (final state).

2L: Span θ _i : Deflection angle in the initial state θ _μ : Deflection angle in the final state E: Elastic coefficient of FRP 19 A: Cross-sectional area of FRP 19 Assuming that the final tension P is P = (1 / cos θ) _μ −1 / cos θ _i ) / (1 / cos θ
_i ) · (EA). It is necessary to separately consider bending, friction, and the like.

In the present embodiment, when a predetermined tension is applied to the FRP 19, the jack 31 provided on the upper floor slab 1 is used, so that most of the work can be performed in the space inside the concrete frame, and the space is large outside. Since a work space is not required, it can be used also when constructing a continuous girder or the like. Also, the integrity of the concrete is guaranteed. Also,
Since the plurality of FRPs 19 are passed through the plurality of holes 25 of the concrete block 23, damage to the FRP 1 can be avoided. Further, when fixing the FRP 19 to the side plates 5, 7, mortar or the like is used. Corrosion can be avoided.

FIGS. 11 and 12 show other shapes of the boxless portion above the side plate 5. FIG. The boxless portion 9a may be formed in a conical shape as shown in FIG. 10, or the boxless portion 9b may be formed in a multistage cylindrical shape having different diameters as shown in FIG. In addition, 21 is an FRP for reinforcement.

FIG. 13 shows an example in which a predetermined tension is applied to the FRP 19 using a jack 37 provided on the lower slab 3 side. That is, the fixed part 3 is attached to the lower deck 3.
3 and 35, one end of a connecting line 36 is fixed to the fixing portion 33, the connecting line 36 is engaged with an engaging portion 38 provided on the concrete block 23, and the other end of the connecting line 36 is connected to a jack 37. The concrete block 23 is moved to the lower slab 3 by pulling the jack 37 in the direction C in the figure, and the concrete block 23 is finally fixed to the lower slab 3 with bolts.

In each of the above-described examples, an example using FRP has been described. However, an outer cable structure can also be constructed using a PC steel wire, a PC steel material, or the like. FIG. 14 is a perspective view of the vicinity of the concrete block 23a when the PC steel wire 41 is used. One hole 40 is opened in the concrete block 23a, and a PC steel wire 41 is inserted into the hole 40.
, And pressed by a jack 31.

As shown in FIG. 15, a groove 42 is provided in the concrete block 23b, and the PC steel wire 4 is inserted into the groove 42.
1 may be arranged so as to fit, and may be pressed by the jack 31. In addition, as shown in FIG.
A sheath 43 is provided in the inside, and a PC steel wire 4 is
1, the steel frame 23c may be pressed by the jack 31 to the lower floor 3 side. in this case,
When the steel frame 23c contacts the lower slab 3, after fixing the steel frame 23c with the lower slab 3 with bolts, concrete 45 is poured into the steel frame 23c and solidified as shown in FIG.

[0022]

As described in detail above, according to the present invention, work can be performed in the space of a structure, and it can be used for constructing a continuous girder, etc., and the integrity of concrete is guaranteed. And a method of manufacturing the same.

[Brief description of the drawings]

Fig. 1 Side view of concrete frame

FIG. 2 is an enlarged view of the upper part of the side plate 2.

FIG. 3 is a view showing a guide 17;

FIG. 4 is a perspective view of a concrete block 23.

FIG. 5 is an explanatory view of a state in which an initial tension is applied to FRP19.

FIG. 6 is an enlarged view near the jack 15;

FIG. 7 is a sectional view of the plate 11;

FIG. 8 is an explanatory view of a state where a jack 31 is installed.

FIG. 9 is an explanatory view of a state where the concrete block 23 is in contact with the lower slab 3;

FIG. 10 is an explanatory diagram for calculating a final tension P of FRP19.

FIG. 11 is a view showing another shape of the boxless portion;

FIG. 12 is a view showing another shape of the boxless portion;

FIG. 13 is an explanatory view of a case where a jack 37 is provided on the lower floor slab 3 side and the concrete block 23 is moved to the lower floor slab 3 side.

FIG. 14 is a perspective view of the vicinity of a concrete block 23a when a PC steel wire 41 is used.

FIG. 15 is a perspective view of the vicinity of a concrete block 23b when a PC steel wire 41 is used.

FIG. 16 is a perspective view of a steel frame 23c.

FIG. 17: Steel frame 2 on which concrete is cast
Figure showing 3c

FIG. 18 is a diagram showing a conventional outer cable structure.

FIG. 19 is a diagram showing a conventional outer cable structure.

[Explanation of symbols]

 1 Upper slab 3 Lower slab 5, 7 Side slab 15 Jack 19 FRP 23, 23a, 23b Concrete block 23c Steel frame 31, 37 Jack

Claims (6)

(57) [Claims] 1. A step of fixing both ends of a tension member to both side plates of a concrete frame comprising an upper floor slab, a lower floor slab, and a side slab, and (b) a lower floor slab near a central portion of the tension member. Pull to the side,
Fixing the outer cable structure to the lower floor slab. 2. The method according to claim 1, wherein the tension member is a fiber reinforced plastic. 3. The method for manufacturing an outer cable structure according to claim 1, wherein the tension member is a PC steel material or a PC steel wire. 4. The outer cable structure according to claim 1, wherein in the step (b), a jack is provided on the upper floor slab, and the central portion of the tension member is pushed down to the lower floor slab by the jack. Production method. 5. The outer cable structure according to claim 1, wherein in the step (b), a jack is provided on the lower floor slab, and the jack pulls a portion near the center of the tension member toward the lower floor slab. Manufacturing method. 6. An outer cable structure obtained by the method for manufacturing an outer cable structure according to any one of claims 1 to 5.