CN106702891A - Hidden seam type expansion joint structure - Google Patents

Abstract

A concealed expansion joint structure, wherein an elastic sealing layer is filled in an installation groove, the elastic sealing layer covers the top opening of the expansion joint, and the outer wall surface of the elastic sealing layer is bonded to the inner wall surface of the installation groove; a waterproof layer is laid between the elastic sealing layer and the road surface layer; a first anchoring steel bar is provided between the abutment back wall and the elastic sealing layer, the bottom end of the first anchoring steel bar is located in the abutment back wall, and the top end of the first anchoring steel bar penetrates into the elastic sealing layer and extends horizontally along the elastic sealing layer; a second anchoring steel bar is provided between the beam end of the main beam and the elastic sealing layer, the bottom end of the second anchoring steel bar is located in the beam end of the main beam, and the top end of the second anchoring steel bar penetrates into the elastic sealing layer and extends horizontally along the elastic sealing layer; the top end of the first anchoring steel bar and the top end of the second anchoring steel bar are overlapped; the expansion joint is filled with elastic material.

Description

A blind seam type expansion joint structure

technical field

The invention relates to a blind seam type expansion joint structure.

Background technique

In traditional bridge structures, in order to allow vehicles to pass through the bridge deck smoothly and meet the needs of deck deformation, bridge telescopic devices are generally installed between the ends of the two beams and between the ends of the beams and the back wall of the abutment. The types of bridge expansion devices include U-shaped zinc iron sheet expansion devices, spanning steel plate type expansion devices, rubber expansion devices, etc., and rubber expansion devices are mostly used at present.

During the use of the bridge, the bridge expansion device is the most vulnerable and difficult to repair part of the bridge, which requires frequent maintenance and timely replacement. After the bridge expansion device is damaged, it will not only affect the free deformation of the bridge, but also cause the infiltration of water flow on the bridge deck, and the infiltration of water flow will affect the corrosion of the substructure of the bridge including the bearing, which further affects the safety and security of the bridge structure. durability.

Contents of the invention

In order to overcome the defects in the background technology, the present invention provides a blind seam type expansion joint structure.

The technical scheme that the present invention solves the above problems is:

A blind joint type expansion joint structure, the beam end of the main girder is placed on the abutment cap, and an expansion joint is left between the girder end of the main girder and the abutment back wall, and the top of the main girder and the abutment back wall are laid There is a pavement layer, the upper pavement layer, the abutment back wall on both sides and the beam ends form an installation groove above the expansion joint, the installation groove is filled with an elastic sealing layer, and the elastic sealing layer covers the top opening of the expansion joint , the outer wall surface of the elastic sealing layer is bonded to the inner wall surface of the installation groove; a waterproof layer is laid between the elastic sealing layer and the pavement layer;

A first anchoring steel bar is arranged between the abutment back wall and the elastic sealing layer, the bottom end of the first anchoring steel bar is located in the abutment back wall, and the top end of the first anchoring steel bar penetrates into the elastic sealing layer and runs horizontally along the elastic sealing layer extend;

A second anchoring steel bar is arranged between the beam end of the main beam and the elastic sealing layer, the bottom end of the second anchoring steel bar is located in the beam end of the main beam, and the top end of the second anchoring steel bar penetrates into the elastic sealing layer and moves along the elastic sealing layer. Layers extend horizontally;

The top of the first anchoring steel bar is overlapped with the top of the second anchoring steel bar;

The expansion joints are filled with elastic materials.

Further, the axes of the first anchoring reinforcement and the second anchoring reinforcement are symmetrical about the expansion joint.

Further, both the first anchoring reinforcement and the second anchoring reinforcement are inverted L-shaped, and the structures and sizes of the first anchoring reinforcement and the second anchoring reinforcement are the same.

Further, the pavement layer is an asphalt concrete pavement layer.

Further, the inner wall surface of the installation groove and the outer wall surface of the elastic sealing layer are bonded by an epoxy resin adhesive.

Further, the elastic sealing layer is a synthetic fiber concrete layer.

Further, the length of the first anchoring steel bar is greater than 6 times the diameter of the first anchoring steel bar, and the length of the second anchoring steel bar is greater than 6 times the diameter of the second anchoring steel bar.

Further, the elastic material in the expansion joint is a foam board.

Further, the material of the waterproof layer is polymer modified asphalt waterproof coating.

The beneficial effects of the present invention are mainly manifested in:

1. Synthetic fiber concrete can effectively improve the shrinkage resistance, crack resistance, impact resistance and other characteristics of the pavement layer, so as to meet the expansion and contraction deformation of the bridge deck due to temperature changes.

2. The waterproof layer is combined with the pavement layer to form a double-layer waterproof layer, which can effectively prevent the damage to the bridge structure caused by the dissolved snow water of rainwater and deicing salt and other substances.

3. The process of transforming existing bridge expansion joints to achieve seamlessness can be implemented in stages to avoid traffic interruption, and the construction is simple and fast.

Description of drawings

Figure 1 is a schematic diagram of the beam end of the main girder and the back wall of the abutment.

Fig. 2 is a structural schematic diagram of the present invention.

Fig. 3 is a schematic diagram of the structure after removing the original telescopic device and chiseling away the bridge deck between the back wall of the abutment and the end face of the beam.

Fig. 4 is a schematic diagram of the structure after setting the first anchoring steel bar and the second anchoring steel bar and painting the epoxy resin adhesive.

detailed description

Referring to the accompanying drawings, a blind joint type expansion joint structure, the girder end 2 of the main girder is placed on the platform cap 10, and an expansion joint is left between the girder end 2 of the main girder and the abutment back wall 1, and the upper part of the main girder and the top of the abutment back wall 1 is paved with a pavement layer 6,

The upper pavement layer 6, the abutment back wall 1 on both sides and the beam end 2 form an installation groove above the expansion joint, and the installation groove is filled with an elastic sealing layer 5, and the elastic sealing layer 5 covers the top of the expansion joint Opening, the outer wall surface of the elastic sealing layer 5 is bonded to the inner wall surface of the installation groove; a waterproof layer 8 is laid between the elastic sealing layer 5 and the road surface layer 6;

A first anchoring steel bar 4 is arranged between the abutment back wall 1 and the elastic sealing layer 5, the bottom end of the first anchoring steel bar 4 is located in the abutment back wall 1, and the top end of the first anchoring steel bar 4 penetrates the elastic sealing layer 5 Inner and horizontally extending along the elastic sealing layer 5;

A second anchoring bar 7 is arranged between the beam end 2 of the main beam and the elastic sealing layer 5, the bottom end of the second anchoring bar 7 is located in the beam end 2 of the main beam, and the top end of the second anchoring bar 7 penetrates the elastic seal Layer 5 and extends horizontally along the elastic sealing layer 5;

The top of the first anchoring steel bar 4 is overlapped with the top of the second anchoring steel bar 7;

The elastic material 3 is filled in the expansion joint.

The first anchor bar 4 and the second anchor bar axis 7 are symmetrical about the expansion joint.

Both the first anchoring reinforcement 4 and the second anchoring reinforcement 7 are inverted L-shaped, and the structures and sizes of the first anchoring reinforcement 4 and the second anchoring reinforcement 7 are the same.

The pavement layer 6 is an asphalt concrete pavement layer.

The inner wall surface of the installation groove and the outer wall surface of the elastic sealing layer 5 are bonded by an epoxy resin adhesive 9 .

The elastic sealing layer 5 is a synthetic fiber concrete layer.

The length of the first anchoring steel bar 4 is greater than 6 times the diameter of the first anchoring steel bar 4 , and the length of the second anchoring steel bar 7 is greater than 6 times the diameter of the second anchoring steel bar 7 . Under the action of earthquake load, the bridge fluid does not collapse.

The elastic material 3 in the expansion joint is a foam board.

The material of the waterproof layer is polymer modified asphalt waterproof paint.

In this embodiment, a waterproof layer 8 is laid on the elastic sealing layer 5, and the waterproof layer 8 and the pavement layer 6 form a double layer of waterproofing, which effectively prevents damage to the bridge structure by rainwater and snow water dissolved by substances such as deicing salt.

Construction process of the present invention is as follows:

Remove the original telescopic device between the beam end 2 and the abutment back wall 1 of the existing concrete bridge, and chisel out the bridge deck between the top of the abutment back wall 1 and the end face of the beam end, as shown in Figure 3;

Fill the expansion joint with elastic material 3;

Set the first anchoring steel bar 4 and the second anchoring steel bar 7, and paint the epoxy resin adhesive 9 on the abutment back wall 1 and the end surface of the beam end 2, as shown in Figure 4;

Pour synthetic fiber concrete to form an elastic sealing layer 5. After curing, lay a waterproof layer 8 on the elastic sealing layer 5 (that is, brush polymer modified asphalt waterproof coating), and finally lay asphalt concrete to form a pavement layer 6, as shown in Figure 2 Show.

The invention not only has a certain stretching function, but also can protect the expansion joints. In addition, the stretching device between the beam end and the bridge abutment is removed, which effectively improves the flatness of the bridge deck, improves durability and waterproofness , and the design and construction are convenient.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (9)

1. A blind joint type expansion joint structure, the beam end of the main beam is placed on the platform cap, and an expansion joint is left between the beam end of the main beam and the back wall of the abutment, and it is characterized in that: the top of the main beam and the bridge A pavement layer is laid above the abutment back wall, and the upper pavement layer, the abutment back walls on both sides and the beam ends form an installation groove above the expansion joint, and the installation groove is filled with an elastic sealing layer, and the elastic sealing layer Covering the top opening of the expansion joint, the outer wall surface of the elastic sealing layer is bonded to the inner wall surface of the installation groove; a waterproof layer is laid between the elastic sealing layer and the pavement layer; A first anchoring steel bar is arranged between the abutment back wall and the elastic sealing layer, the bottom end of the first anchoring steel bar is located in the abutment back wall, and the top end of the first anchoring steel bar penetrates into the elastic sealing layer and runs horizontally along the elastic sealing layer extend; A second anchoring steel bar is arranged between the beam end of the main beam and the elastic sealing layer, the bottom end of the second anchoring steel bar is located in the beam end of the main beam, and the top end of the second anchoring steel bar penetrates into the elastic sealing layer and moves along the elastic sealing layer. Layers extend horizontally; The top of the first anchoring steel bar is overlapped with the top of the second anchoring steel bar; The expansion joints are filled with elastic materials. 2. A blind seam type expansion joint structure according to claim 1, characterized in that: the axis of the first anchoring steel bar and the second anchoring steel bar are symmetrical about the expansion joint. 3. A kind of blind seam type expansion joint structure as claimed in claim 2, characterized in that: the first anchoring reinforcement and the second anchoring reinforcement are in an inverted L shape, the structure and size of the first anchoring reinforcement and the second anchoring reinforcement are the same. 4. A blind seam type expansion joint structure according to claim 3, characterized in that: said pavement layer is an asphalt concrete pavement layer. 5. A blind seam type expansion joint structure according to claim 4, characterized in that: the inner wall of the installation groove and the outer wall of the elastic sealing layer are bonded by an epoxy resin adhesive. 6. A blind seam type expansion joint structure as claimed in claim 5, characterized in that the elastic sealing layer is a synthetic fiber concrete layer. 7. A blind seam type expansion joint structure as claimed in claim 6, characterized in that: the length of the first anchoring reinforcement is greater than 6 times the diameter of the first anchoring reinforcement, and the length of the second anchoring reinforcement is greater than 6 times the diameter of the first anchoring reinforcement Second, the diameter of the anchor bar. 8. The blind seam expansion joint structure according to claim 7, wherein the elastic material in the expansion joint is a foam board. 9. A blind seam type expansion joint structure according to claim 8, characterized in that: the material of the waterproof layer is polymer modified asphalt waterproof paint.