JP2003313807A - Structure of floor slab joint part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly durable structure of a floor slab joint part provided with a floor slab expansion connecting device having a fiber-reinforced sheet, excellent in vibration isolating characteristic with high expanding and contracting performance, and capable of reducing occurrence of vibration or noise. <P>SOLUTION: This floor slab joint part 100 comprises a connecting part covering member 101 placed on both sides of an expansion gap part G so as to cover the floor slab expansion connecting device 1 in a prescribed distance W<SB>3</SB>, an adhesive layer 102 applied on the connecting part covering member 101, and drainable asphalt 300B filled with resin, which is placed as the upper layer of the connecting part coating member 101 through the adhesive layer 102. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a joint portion for elastically connecting floor slabs, such as bridges, which are opposed to each other via a gap in an expressway.

[0002]

2. Description of the Related Art The applicant of the present patent application is Japanese Patent Application Laid-Open No. 2001-15.
As disclosed in Japanese Patent Application No. 2407 and Japanese Patent Application No. 2001-321235, a floor slab expansion and contraction connecting device for absorbing and relaxing expansion and contraction of a bridge (floor slab) has been proposed, and has been successfully used in actual practice. The following is a brief description with reference to FIG.

That is, the floor slab expansion and contraction connecting device 1 includes a supporting metal plate 2 attached to the surface of a concrete skeleton 201 located on both sides of the play space G in the joint portion 100 of both adjacent floor slabs 200, and a reinforcing fiber. The seat 3 is provided. The reinforcing fiber sheet 3 has a curved portion 3a having an expandable and contractable radius R, and both end portions 3b integrally fixed to the supporting metal plate 2 by pressing plates 4 and bolts 5 on flat portions of both supporting metal plates 2. .

Further, the supporting metal plate 2 is provided with an anchor bar 6 fixed integrally, and the anchor bar 6 is exposed when the concrete is removed.
By welding it to 03 etc., the concrete frame 20
It is attached to 1.

Further, in the floor slab joint section 100 equipped with the floor slab expansion and contraction connecting device 1 having such a structure, the connection slab covering material 101 (101A, 101B, 101) covering the floor slab expansion and contraction connecting device 1 is provided.
C) is cast to the same height as the adjacent asphalt 300 part. Conventionally, as the connection portion coating material 101, rubber asphalt or a connection portion coating resin mortar such as urethane resin mortar or MMA resin mortar has been used.

[0006] Further, the connecting portion covering material 101 at a distance (W ₁ ) corresponding to the position of the reinforcing fiber sheet 3 of the floor slab expansion and contraction connecting device 1.
In particular, as shown in the figure, C is subjected to the most expansion and contraction action, and in particular, the connecting portion covering material 10 cast above the supporting metal plate 2 is provided.
It has also been proposed to use a resin mortar 101C that is softer than 1B.

In the floor slab joint 100 having the above structure, the reinforcing fiber sheet 3 and the connecting portion covering material 101 such as the connecting portion covering resin mortar have excellent vibration-proof characteristics, and thus the conventional steel expansion and contraction device. By comparison, the noise generated can be significantly reduced and the durability is excellent.

[0008]

However, according to the results of further research and experiments conducted by the present inventors, according to the bridge joint portion 100 having the above-mentioned structure, the connection portion coating such as the rubber asphalt or the connection portion coating resin mortar is obtained. Material 101B, 101
There is a difference in durability between the road surface of the joint portion 100 coated with C and the adjacent asphalt road surface 300. Therefore, after many years of use, the joint portion covering material 10
Connection position P1 between 1B and 101C and asphalt 300
There may be a step in the

Therefore, an object of the present invention is to provide a floor slab expansion and contraction connecting device having a reinforcing fiber sheet, which has a high expansion and contraction performance and is excellent in vibration damping characteristics, and further generates vibration and noise. It is an object of the present invention to provide a floor slab joint structure having excellent durability that can reduce

[0010]

The above object can be achieved by the structure of the floor slab joint portion according to the present invention. In summary, the present invention has a supporting metal plate attached to the surface of the body located on both sides of the free space in the joint portion of the floor slab respectively, and an expandable and contractable curved portion, and at least one of the supporting metal plates is provided. In a structure of a floor slab joint section in which a floor slab expansion and coupling device having a reinforced fiber sheet in which parts are joined, is installed, a predetermined distance (W ₃ ) is provided on both sides of the play space while covering the floor slab expansion and coupling device. The connecting portion covering material cast in, the adhesive layer applied on the connecting portion covering material, and the resin that has been cast through the adhesive layer as the upper layer of the connecting portion covering material and filled with resin. And a drainage asphalt, which is a structure of a floor slab joint.

According to an embodiment of the present invention, the resin-filled drainage asphalt is provided over a distance (W ₄ ) that is greater than the driving distance (W ₃ ) of the connecting portion covering material.

[0012] According to another embodiment of the present invention, the connecting portion covering material located above the stretchable curved portion of the reinforcing fiber sheet is softer than the adjacent connecting portion covering materials located above the supporting plate. Partial covering material.

According to another embodiment of the present invention, the connecting portion coating material is a resin mortar containing rubber asphalt or a coating resin such as urethane resin or MMA resin.

According to another embodiment of the present invention, between the drainage asphalt filled with the resin and the drainage asphalt extending outwardly adjacent to the resin-filled drainage asphalt, A partition layer is formed across the width of the floor slab to prevent the resin from flowing into the extension drainage asphalt.

According to another embodiment of the present invention, the drainage asphalt at a position corresponding to the connecting portion covering material located above the stretchable curved portion of the reinforcing fiber sheet has a predetermined depth from the surface. The elastic layer is formed across the width of the floor slab.

According to another embodiment of the present invention, the partition layer and the elastic layer are resin mortar containing a coating resin such as urethane resin or MMA resin.

According to another embodiment of the present invention, the resin filled in the drainage asphalt is urethane resin or MMA resin, or resin mortar containing urethane resin or MMA resin. At this time, the resin is
It is preferable that the content of the drainage asphalt is 5 to 25% by volume.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a floor slab joint according to the present invention will be described in more detail below with reference to the drawings.

Embodiment 1 Referring to FIG. 1, there is shown a structure of a floor slab joint portion according to an embodiment of the present invention.

First, the floor slab expansion / contraction connecting device 1 used in this embodiment will be described. The floor slab expansion / contraction device 1 has support metal plates 2 extending in the width direction of each floor slab 200 and facing each other with a gap G between both floor slabs 200 interposed therebetween. In the present specification, the width direction of the floor slab 200 means a direction orthogonal to the traveling direction of the vehicle or the like on the floor slab.

Both supporting metal plates 2 are, for example, steel plates and can have the same shape. Each supporting metal plate 2 is a floor slab 2
No. 00 of the gap G (width W ₀ ) on both sides of the frame, that is, the flat portions 2a installed on the upper surfaces of both concretes 201 and 201, and the two concrete 201s connected to the flat portion 2a. The curved portion 2 that is curved downward to the free space portion G
b.

A reinforcing fiber sheet 3 is integrally bonded to the upper surfaces of both supporting metal plates 2. That is, the reinforcing fiber sheet 3
Are both end portions 3b joined at least partially on the flat portions 2a of both supporting metal plates 2 and the curved portion 2 of each supporting metal plate 2.
It has a stretchable bending portion 3a which is curved downward along b and is further curved downward in a U shape at a predetermined radius (R). Both ends 3b of the reinforcing fiber sheet 3 are, as described above,
At least a part is integrally joined to the flat portion 2a of the supporting metal plate 2, but the elastic bending portion 3a is not joined to the supporting metal plate 2 and corresponds to the expansion and contraction between the concretes 201, 201. It can be expanded and contracted.

The reinforcing fiber sheet 3 is a sheet formed by arranging reinforcing fibers in one direction or is a woven fabric in which the reinforcing fibers are woven. As the reinforcing fiber, polyparaphenylene benzbisoxazole (PBO) fiber can be preferably used.

The reinforcing fibers constituting the reinforcing fiber sheet 3 are not limited to PBO fibers, but other glass fibers; organic fibers such as aramid, nylon and polyester; boron, titanium, steel and the like. It is also possible to use a hybrid type in which one kind or a plurality of kinds of metal fibers are mixed.

The specific dimensions of an example of the floor slab expansion / contraction connecting device 1 are as follows.

Supporting metal plate 2 Thickness of metal plate (steel plate) 2: 6 mm Length of flat part 2a (L ₀ ): 132 mm Radius of curved part 2b (R ₀ ): 53 mm Reinforcing fiber sheet 3 Radius of curved part 3a R: 25 mm Length of both flat parts 3b (L ₀ ): 132 mm Physical properties of reinforcing fiber sheet 3: PBO fiber: Toyobo Co., Ltd. (trade name: Zylon) Tensile modulus 2.7 × 10 ⁵ N / mm ² Tensile Strength 5800 N / mm ² Number of laminated reinforcing fiber sheets 3 layers

Next, with reference to FIG. 1 and FIGS. 2 to 4, a construction method of the floor slab joint portion 100 constructed according to the present invention will be described.

In the floor slab joint portion 100 to which the floor slab expansion and contraction connecting device 1 is attached, an existing connecting device (not shown) is removed by a cutter, a chip (shaving) or the like (FIG. 2 (A)). When the connecting device is not installed, as shown in FIG. 2 (A), the upper surfaces of both concretes 201 of the facing floor slabs 200 are separated by a distance (W ₃ ) And over the entire width of the road, that is, asphalt 300 (300A,
300B) is removed to expose the concrete 201.
Further, as shown in the drawing, the concrete upper surface is chipped and removed to a predetermined depth so as to have a depth (H1) from the road surface, if necessary. In this embodiment, asphalt 300
Will be described as consisting of a base layer asphalt 300A, which is a lower layer, and a drainage asphalt 300B paved on the base layer asphalt 300A.

Next, as shown in FIG. 2B, the supporting metal plate 2 of the floor slab expansion and contraction connecting device 1 is attached to a metal anchor 7 such as an anchor bolt embedded in both concretes 201. That is, the holes formed in the supporting metal plate 2 are inserted into the anchor bolts 7 and the nuts 8 are screwed together, so that the supporting metal plates 2 are firmly attached to both concretes 201. In addition, in this embodiment, the supporting metal plate 2 is installed so that its position is substantially the upper surface position (H ₂ ) of the concrete 201.

The supporting metal plate 2 is fixed by the anchor bolts 7 embedded in the concrete 201 as described above, but the supporting metal plate 2 is not limited to this. For example, the structure shown in FIG. 5 may be used. it can. That is, the supporting metal plate 2 is provided with an anchor bar 6 fixed integrally, and the anchor bar 6 is welded to the main bar 202, the through bar 203, and the like exposed when the concrete is removed. You may attach it.

Next, as shown in FIG. 2 (C), after the backup material B is installed between the two supporting metal plates 2 and in the free space G of both concretes 201, a concrete primer is applied to the concrete 201 surface, Both supporting metal plates 2
To the height (H ₂ ) of the first, that is, the lower-layer connecting material 101A. The amount of primer applied is 0.5-
It is set to 1.5 kg / m ² . In this example, as the concrete primer, Nittetsu Composite Co., Ltd. (trade name: PD primer) was used, and the coating amount was 1 kg.
/ M ² .

Next, as shown in FIG. 2D, the backup material B and the nut 8 of the anchor bolt 7 are removed,
Next, the reinforcing fiber sheet 3 is placed between both supporting metal plates 2, and both end portions 3b of the reinforcing fiber sheet 3 are fixed to the flat portion 2a of the supporting metal plate 2 by the pressing plate 4 and the nut 8. At this time, the curved portion 3a of the reinforcing fiber sheet 3 becomes the floor slab gap G.
It is installed so as to conform to. Thereby, the coupling device 1
Is attached to the joint portion 100 of both floor slabs.

Next, as shown in FIG. 3 (E), the second or upper connecting material 1 for covering the connecting device 1 is covered.
Place 01B. At this time, the second connecting portion covering material 10
1B may be placed by covering the entire surface of the coupling device 1,
As shown in the present embodiment, a third connecting portion covering material 101C, which is softer than the first and second connecting portion covering materials 101A and 101B, is cast in a portion corresponding to the reinforcing fiber sheet curved portion 3a of the connecting device 1. You may.

First and second connecting portion coating materials 101A, 10
1B can be, for example, rubber asphalt, or a connection portion coating resin mortar containing a coating resin such as urethane resin or MMA resin. In the present embodiment, the same resin mortar can be used for the first and second connecting portion coating materials 101A and 101B, or different materials can be used.

Further, it is preferable to use a soft resin mortar which is softer than the first and second connecting portion coating materials 101A and 101B as the third connecting portion coating material 101C. At this time, the soft resin mortar can be arbitrarily prepared by adjusting the amount of coating resin and the composition of silica sand and aggregate.

In this embodiment, the second and third connecting portion coating materials 101B and 101C are the base layer asphalt 30.
It was placed up to the same height (H ₃ ) as the 0A part. Specifically, the second and third connecting portion coating materials 101B and 101C
Was placed so that the distance (H ₄ ) from the road surface position (top end) = 40 mm, that is, it was located above 300 A of the base layer asphalt.

Next, before the cast base layer asphalt 300A is solidified, as shown in FIG. 3 (F), the powdery asphalt 102 is sprinkled on the upper surface of the connecting portion covering material 101 (101B, 101C). . The amount of the powdered asphalt 102 sprayed is 0.5 to 3.0 kg / m ² . As will be described later, the layer of the powdery asphalt 102 functions as an adhesive layer for increasing the adhesive strength with the drainage asphalt 300B that is cast as the upper layer of the connecting portion covering material 101.

After forming the adhesive layer to be the powdery asphalt 102, in this embodiment, all the existing asphalt 300 (300A, 300B) around the floor slab joint is removed (FIG. 3 (G)), and As shown in FIG. 3 (H), the base layer asphalt 300A is newly placed on the removed trace.

Subsequently, as shown in FIG. 4 (I), the connecting portion covering material 101 (101B, 10B of the floor slab joint portion 100).
1C) and the drainage asphalt 300B is cast as a continuous layer on the upper surface of the base layer asphalt 300A. Joint part 1
The connection part covering materials 101B and 101C and 00 which compose 00 and the drainage asphalt 300B are extremely well bonded via the adhesive layer 102.

According to the present embodiment, as shown in FIG. 4 (J), in the floor slab joint portion 100 of the drainage asphalt 300B that has been cast, it is wider than the connecting portion covering material distance W ₃ of the joint portion 100. For example, the end groove (slit) 103 is formed at a position where the distance W ₄ is about 50 to 100 cm and over the entire width of the floor slab concrete structure 201. The depth t ₁ of the groove 103 reaches the base layer asphalt 300A, and therefore, for example, the depth t ₁ is 4 to 5 cm.
It is said that The width g _{1 of the} groove 103 is 0.5 to 1.5c.
m.

Further, in this embodiment, a groove (slit) 104 is also formed in the central portion of the soft resin mortar 101C cast on the curved portion 3a of the reinforcing fiber sheet 3 in the floor slab concrete structure 2.
It is formed over the entire width of 01. The depth t ₂ of the central groove 104 is shallower than the depth of the end groove 103 and can be set to approximately the central portion of the connecting portion covering material 101C. Therefore, for example, the depth t ₂ is 0.5 to 4 cm. It is said that The width g _{2 of the} central groove is 0.3 to 1 cm.

Grooves 103, 104 formed as described above
As shown in FIG. 4 (K), each of the partition layers 10
In this embodiment, resin mortar is filled to form the elastic layer 106 and the elastic layer 106.

After that, the range defined by the resin mortar 105 as the partition layer, that is, the floor slab joint portion 100.
The resin 107 is impregnated into the drainage asphalt 300B within the range of the width W ₄ located above the. In this resin impregnation operation, the resin mortar 105 with which the groove 103 is filled regulates the flow of the resin 107 toward the drainage asphalt 300B adjacent to the outside of the joint portion 100. Therefore, the drainage asphalt 300B extending outward from the joint should be
The resin 107 is not impregnated.

A urethane resin or an MMA resin is preferably used as the resin 107. Further, resin mortar containing urethane resin or MMA resin can also be used. The resin is preferably filled at 5 to 25% by volume with respect to the drainage asphalt. Usually, it is about 20% by volume.

As a result of the experiments conducted by the present inventors, by impregnating the drainage asphalt 300B of the joint portion 100 with the resin 107, the elasticity of the drainage asphalt 300B is improved, cracks are reduced, and the drainage asphalt 300B, Furthermore, it was found that the durability of the joint part 100 was significantly increased.

Further, a groove 104 is provided in the connecting portion covering material 101C placed at the position of the reinforcing fiber sheet 3 of the floor slab expansion and contraction connecting device 1 which receives the most expansion and contraction action, and the groove 104 has a resin mortar 106 as an elastic layer. By filling with, it is possible to give elasticity in this portion, and as a result, it is possible to greatly reduce cracking in the entire joint portion 100, and to greatly improve the durability of the floor slab joint portion 100. I was able to.

In the structure of the floor slab joint section 100 of this embodiment, the floor slab expansion and contraction connecting device 1 having the above-mentioned configuration is used.
The following materials were used as the connecting portion coating material and other materials, and good results could be obtained.

Connection part coating material 101A resin mortar: Nittetsu Composite Co., Ltd. (trade name:
FJ-20) the width (W _3): 600 mm thickness (H _2): 30 mm connecting portion covering member 101B resin mortar: Nippon Steel Composite Co., Ltd. (trade name:
FJ-20) Width (W ₃ ): 600 mm Thickness (H ₃ ): 30 mm Connection part covering material 101C Soft resin mortar: Nittetsu Composite Co., Ltd. (trade name: FJ-30) Width (W ₁ ): 140 mm adhesive Layer 102 Powder asphalt: Nittetsu Composite Co., Ltd. (trade name: FJ-RA) Spreading amount: 2 kg / m ² Partition layer 105 Resin mortar: Nittetsu Composite Co., Ltd. (trade name:
FJ-30) Width (g ₁ ): 10 mm Depth (t ₁ ): 40 mm Elastic layer 106 Resin mortar: Nittetsu Composite Co., Ltd. (trade name:
FJ-30 resin) Width (g ₂ ): 5 mm Depth (t ₂ ): 20 mm Resin 107 resin mortar: Nittetsu Composite Co., Ltd. (trade name:
FJ-30 resin) Filling amount: 20% by volume with respect to drainage asphalt

[0049]

As described above, the structure of the floor slab joint portion of the present invention has a supporting metal plate attached to the surface of the skeleton located on both sides of the free space in the joint portion of the floor slab, respectively.
In a structure of a floor slab joint section in which a floor slab expansion and contraction device having an expandable and contractible curved portion and a reinforcing fiber sheet at least a part of which is joined to both supporting metal plates is installed, And a connecting portion covering material that is cast on both sides of the play portion with a predetermined width, an adhesive layer applied on the connecting portion covering material, and an adhesive layer as an upper layer of the connecting portion covering material. The drainage asphalt filled with the resin, and has a high expansion / contraction performance and excellent vibration damping characteristics, and further has a significantly improved durability to reduce vibration and noise. Occurrence can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the structure of a floor slab joint portion of the present invention.

FIG. 2 is a diagram illustrating a construction method for realizing the structure of the floor slab joint portion of the present invention.

FIG. 3 is a diagram illustrating a construction method for realizing the structure of the floor slab joint portion of the present invention.

FIG. 4 is a diagram illustrating a construction method for realizing the structure of the floor slab joint portion of the present invention.

FIG. 5 is a cross-sectional view showing an example of the structure of a conventional floor slab joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Floor slab expansion / contraction connecting device 2 Support metal plate 3 Reinforcing fiber sheet 3a Expansion / contraction curved part 7 Anchor bolt 100 Floor slab joint parts 101A, 101B, 101C Resin mortar (connection part covering material) 102 Powdery asphalt (adhesive layer) 103, 104 Groove 105 Partition layer 106 Elastic layer 107 Resin 200 Floor slab 201 Body (concrete) 300 Asphalt 300A Base layer asphalt 300B Drainage asphalt

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Imamura             3-8 Kobunecho, Nihonbashi, Chuo-ku, Tokyo             Inposit Co., Ltd. (72) Inventor Toshikazu Takeda             3-8 Kobunecho, Nihonbashi, Chuo-ku, Tokyo             Inposit Co., Ltd. F-term (reference) 2D051 AA03 AF11 AG01 AG13 FA03                 2D059 AA14 BB37 BB39 GG02 GG45

Claims (9)

[Claims] 1. A support metal plate attached to each surface of a frame located on both sides of a play part in a joint portion of a floor slab, and an expandable / contractible curved portion, at least a part of which is joined to both support metal plates. In the structure of the floor slab joint unit in which the floor slab expansion and contraction connecting device having the above-mentioned reinforced fiber sheet is installed, the floor slab expansion and contraction connecting device is covered with a predetermined distance (W ₃ ) on both sides of the play space. A connecting portion covering material provided, an adhesive layer constructed on the connecting portion covering material, and a resin-filled drainage cast through the adhesive layer as an upper layer of the connecting portion covering material. A structure of a floor slab joint, characterized by having asphalt. 2. The drainage asphalt filled with the resin is provided over a distance (W ₄ ) larger than the driving distance (W ₃ ) of the connecting portion coating material. Structure of floor slab joint. 3. The connecting-portion covering material located above the expandable / contractible curved portion of the reinforcing fiber sheet is a softer connecting-portion covering material than the adjacent connecting-portion covering materials located above the support plate. The structure of the floor slab joint portion according to claim 1 or 2. 4. The floor slab joint portion according to claim 1, wherein the connection portion covering material is rubber asphalt or resin mortar containing a coating resin such as urethane resin or MMA resin. Construction. 5. Between the resin-filled drainage asphalt and the drainage asphalt that extends to the outside adjacent to the resin-filled drainage asphalt, the resin becomes an extension drainage asphalt. The structure of the floor slab joint section according to any one of claims 1 to 4, wherein a partition layer for preventing the fluidization is formed over the width direction of the floor slab. 6. The drainage asphalt at a position corresponding to the connecting portion covering material located above the stretchable curved portion of the reinforcing fiber sheet has an elastic layer having a width of the floor slab at a predetermined depth from the surface. The structure of the floor slab joint section according to any one of claims 1 to 5, wherein the structure is formed over the direction. 7. The structure of the floor slab joint portion according to claim 5, wherein the partition layer and the elastic layer are resin mortar containing a coating resin such as urethane resin or MMA resin. 8. The resin with which the drainage asphalt is filled is a urethane resin or MMA resin, or a resin mortar containing a urethane resin or MMA resin, according to any one of claims 1 to 7. Structure of the floor slab joint section described in. 9. The floor slab joint structure according to claim 8, wherein the resin is filled in an amount of 5 to 25% by volume with respect to the drainage asphalt.