CN111794101A - Continuous device and construction method for cold-formed thin-walled steel-concrete composite bridge deck - Google Patents

Abstract

The invention discloses a cold-formed thin-wall section steel-concrete combined bridge floor continuous device applied to a reinforced concrete simply-supported beam bridge, which comprises a prefabricated steel standard section formed by connecting C-shaped cold-formed thin-wall section steel and a steel plate through self-tapping self-drilling screws, wherein the steel standard section is supported on a cement mortar leveling layer and a felt on the surface of a beam plate, self-tapping self-drilling screws are arranged on two sides of the steel standard section to be connected with a stainless steel U-shaped drainage groove, waterproof sealant is embedded in the U-shaped drainage groove, and the steel plate on one side extends to the bridge floor. The invention can effectively prevent concrete from cracking, discharge seepage water to two sides of the bridge, prevent concrete from erosion, and has convenient assembly and splicing on a construction site, no need of welding, high construction speed and low cost.

Description

Continuous device and construction method for cold-formed thin-walled steel-concrete composite bridge deck

technical field

The invention relates to the field of bridge deck continuation, in particular to a bridge deck continuation device and a bridge deck continuation method of a simply supported girder bridge.

Background technique

Bridges are buildings built by human beings to overcome natural obstacles in their daily life and production activities. For bridges, expansion joints should be set between the beam ends of two adjacent spans, between the beam end and the abutment, at both ends of the hanging beam, at the hinge of the bridge, etc., so as to adapt to the expansion caused by the beam structure under the action of temperature stress. Rotational and longitudinal displacements of beam ends are caused by shrinkage deformation and vehicle loads. For multi-span simply supported hollow slab girder bridges, in order to reduce the number of expansion joints on the bridge deck, improve the smoothness of traffic and the service life of the bridge, the design method of "continuous bridge deck" is often adopted, and the multi-spans are combined into one connection. Set expansion joints between the joints.

Since the 1970s in my country, the continuous bridge deck construction method has been used, and it has been widely used on highways and municipal bridges. Due to problems such as poor material durability, the continuous use effect of the tie-rod bridge deck is poor, and the tensile force transmitted to the bridge deck continuous concrete cannot be resisted by the bridge deck continuous steel bars and the bridge deck paving steel mesh, and concrete cracks are prone to occur in the continuous parts of the bridge deck. The rainwater infiltrates and erodes the lower structure of the bridge, which seriously affects the durability and driving smoothness of the bridge. In addition, the existing bridge deck continuous device has a complex structure and is inconvenient to assemble. Therefore, it is necessary to develop a new type of bridge deck continuity that is resistant to concrete cracking and is easy to assemble.

SUMMARY OF THE INVENTION

[technical problem]

The technical problem of the present invention is to provide a novel bridge deck continuous device which is resistant to concrete cracking, drains water seepage to both sides of the bridge, prevents concrete erosion and is easy to assemble.

[Technical solutions]

The present invention first provides a continuous device for a cold-formed thin-walled steel-concrete composite bridge deck. The device includes a steel standard section including a C-shaped cold-formed thin-walled steel and a bearing steel plate; the steel standard section is supported on a reinforced concrete prefabricated section. On the cement mortar leveling layer on the upper surface of the T beam; the C-shaped cold-formed thin-walled steel is a cold-formed inner-rolled prefabricated channel steel, and the limbs are cut off at both ends; a plurality of cold-formed C-shaped cold-formed thin-walled The bridge direction is connected as a whole, after the C-shaped cold-formed thin-walled steel is connected, a T-shaped steel rib is formed; the bearing steel plate is connected with the bottom of the C-shaped cold-formed thin-walled steel; the steel standard section is provided on both sides with U-shaped stainless steel drainage groove with waterproof sealant embedded in the groove.

In an embodiment of the present invention, a piece of foam glue extending along the transverse bridge direction is bonded to the outside of the support steel plate.

In an embodiment of the present invention, the cold-formed C-shaped cold-formed thin-walled steel limbs are aligned with the limbs, and are connected along the midline of the limbs by self-tapping and self-drilling screws, so as to be integrally connected along the transverse bridge direction.

In an embodiment of the present invention, the U-shaped drainage channel includes a long steel edge and a segment steel edge, the long steel plate edge is aligned with the uncut dorsal end of the profile steel, and is connected with the extended steel plate by self-tapping and self-drilling screws The extension steel plate is a thin steel plate that connects the extension steel plate with the C-type cold-formed thin-walled steel and the support steel plate through self-tapping bolts; An extended steel plate formed by leaving only the bottom plate at both ends.

In an embodiment of the present invention, the C-shaped cold-formed thin-walled steel and the steel plate support are connected by hexagonal bolts.

In an embodiment of the present invention, the cement mortar leveling layer is a flat and smooth cast-in-situ belt cast at a certain distance from the upper surface of the end of the reinforced concrete beam, and the support steel plate can be placed on the cement mortar leveling layer. The surface slides along the longitudinal bridge.

In an embodiment of the present invention, a layer of linoleum is spread on the smooth cement mortar leveling layer.

In an embodiment of the present invention, the U-shaped drainage channel is formed by bending a stainless steel plate with a length equal to the width of the bridge.

The invention also provides a construction method of a cold-formed thin-walled steel-concrete composite bridge deck continuous device, comprising the following steps:

1), prefabricated C-type cold-formed thin-walled steel with drilled holes in the factory, bearing steel plate with drilled bolt holes, U-shaped drainage groove, and extended steel plate of cold-formed thin-walled steel; C-type cold-formed thin-walled steel according to the bridge width The wall section steel is assembled and spliced with self-tapping and self-drilling screws along the transverse bridge direction into the required width, and the C-type cold-formed thin-wall section steel and the bearing steel plate are connected by M14 hexagonal bolts, and then a 20mm thick, Foam glue that runs along the transverse bridge;

2), clean up the upper surface of the beam body with a certain distance from the end of the reinforced concrete prefabricated T beam and cast a smooth and smooth cement mortar leveling layer;

3) At the construction site, the standard section of the U-shaped drainage channel is fixed on the extension steel plate of the cold-formed thin-walled steel with self-tapping and self-drilling screws;

4) Embed waterproof sealant in the U-shaped drainage groove;

5) Lay the bridge deck pavement steel mesh above the C-shaped cold-formed thin-walled steel, and pour the bridge deck continuous concrete.

In an embodiment of the present invention, in step 2), the cement mortar adopts the grade of M15 or above, and the plane height difference of the leveling layer is controlled at ±015cm.

[Beneficial effect]

1. The cold-formed thin-walled steel in the bridge deck continuous device of the present invention is light in weight, high in strength, rich in cross-sectional forms, and high in yield point, which greatly improves the longitudinal tensile capacity and longitudinal stiffness, and is applied to simply supported girder bridges. Prevent concrete cracking in the continuous parts of the bridge deck, especially the upper surface, and have good drainage function.

2. The present invention changes the continuous form of the traditional bridge deck, leaving a certain space under the steel-concrete composite structure, which can effectively avoid the vertical extrusion of the bridge deck continuous structure caused by the upturning of the beam ends, and at the same time the steel-concrete composite bridge deck The continuous device can slide freely along the longitudinal direction through the smooth bearing steel plate and the linoleum, effectively reducing the restraint effect of the beam end displacement on the continuous device on the bridge deck.

3. The structure of this bridge deck continuous device is simple. It is basically composed of C-shaped cold-formed thin-walled steel, which is easy to be processed in the factory and convenient for on-site construction. Construction time and cost.

4. The C-shaped cold-formed thin-walled steel can strengthen the bonding performance between the concrete and the steel. The steel is connected to form a T-rib, which enhances the vertical rigidity of the continuous device of the bridge deck. The steel is connected by bolts to avoid the complicated addition of ribs Rib process.

5. The continuous device of cold-formed thin-walled steel-concrete composite bridge deck has good tensile performance. The longitudinally extending steel plate transmits the tensile force of the bridge deck to the C-shaped cold-formed thin-walled steel, and the stainless steel plate is embedded in the concrete to form the separation joint resistance The continuous force transmission path from the bridge deck pavement to the bridge deck is broken, so as to ensure that the continuous concrete part of the bridge deck has no tensile stress or very little tensile stress.

6. The steel plate, linoleum felt and cement mortar leveling layer of the support at both ends of the thin-walled section steel provide a certain space for the upturning of the beam end, which effectively avoids the continuous vertical extrusion effect of the upturning beam end on the bridge deck.

7. The existence of cold-formed thin-walled steel reduces the height of the neutral axis of the composite section. Under the action of tensile force, the steel structure part of the steel-concrete composite structure mainly bears or completely bears the tensile force, which makes the composite structure as a whole produce a positive bending moment. , which is conducive to the compression effect of the continuous concrete of the bridge deck, thereby completely eliminating the possibility of concrete cracking on the continuous surface of the bridge deck.

8. Cold-formed thin-walled steel has the advantages of high productivity, thin wall and steel saving, rich section forms, high yield point, and high bending and tensile properties. The bond strength of steel and concrete increases the vertical stiffness of the composite structure.

9. The present invention is easy to assemble and spliced on site, and does not need welding connection, which greatly saves construction time and construction cost.

10. From the point of view of the manufacturing process, the U-shaped drainage groove collects the rainwater infiltrated in the separation joint and guides it to both ends of the bridge for discharge, thereby achieving the effect of preventing water seepage and eroding concrete. The steel standard section of the bridge deck continuous device of the present invention has a simple structure. , which is very suitable for standardized production prefabrication, transportation and assembly, and has strong operability for on-site assembly and welding.

Description of drawings

FIG. 1 is a continuous structural diagram of a conventional tie-rod bridge deck.

FIG. 2 is a continuous structural diagram of the cold-formed thin-walled steel-concrete composite bridge deck of Example 1. FIG.

FIG. 3 is a continuous elevation layout diagram of the cold-formed thin-walled steel-concrete composite bridge deck of Example 1. FIG.

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 .

FIG. 5 is a connection diagram of the bearing steel plate and the C-shaped cold-formed thin-walled steel in Example 1. FIG.

FIG. 6 is a cross-bridge connection diagram of the C-shaped cold-formed thin-walled steel in Example 1. FIG.

FIG. 7 is a schematic diagram of the assembly of the extended steel plate of Example 1. FIG.

FIG. 8 is a simplified diagram of the continuous force of the cold-formed thin-walled steel-concrete composite bridge deck of Example 3. FIG.

FIG. 9 is a schematic diagram of the continuous stress action mechanism of the cold-formed thin-walled steel-concrete composite bridge deck of Example 3. FIG.

FIG. 10 is a schematic diagram of a numerical simulation of a loading condition in Example 3. FIG.

11 is a three-dimensional structural diagram of an extended steel plate, a C-shaped steel and a drainage groove of Example 3. FIG.

FIG. 12 is the continuous numerical simulation calculation result of the cold-formed thin-walled steel-concrete composite bridge deck of Example 3. FIG.

In the picture: C40 concrete pavement 1, asphalt concrete pavement 2, steel standard section 3, extension steel plate 4, longitudinal connecting steel bar 5, C-type cold-formed thin-walled steel 6, bearing steel plate 7, prefabricated T beam 8, U-shaped drainage groove 9, long steel plate edge 10, short steel edge 11, waterproof sealant 12, hexagonal bolt 13.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Example 1

This embodiment provides a continuous device for a cold-formed thin-walled steel-concrete composite bridge deck applied to a reinforced concrete simply supported girder bridge, please refer to accompanying drawings 2-4.

The bridge deck continuous device is arranged on the reinforced concrete prefabricated T beam 8, the upper layer of the prefabricated T beam 8 is a 10cm thick C40 concrete pavement layer 1, and the top of the C40 concrete pavement layer 1 is a 10cm thick asphalt concrete pavement layer 2.

The bridge deck continuous device includes a steel standard section 3, an extension steel plate 4 is arranged at the bottom of the steel plate standard section 3, the extension steel plate 4 is connected with the concrete pavement layer 1, and the extension steel plate 4 is located at the two sides of the steel plate standard section 3. A longitudinal bridge connecting steel bar 5 with a diameter of 14 mm and a length of 70 cm is welded at certain distances (for example, 20 cm) in the transverse bridge direction at the bottom of the end to continuously connect the bridge deck with the bridge deck pavement.

The steel standard section 3 includes a C-shaped cold-formed thin-walled steel 6, the longitudinal bridge length of the C-shaped cold-formed thin-walled steel 6 is 200cm, and the back of its limbs are cut off at 50cm at each end, and the transverse bridge width is 20cm , the wall thickness is 3cm, and the rounded corners at the bend are R=7.5cm. According to the actual width of the bridge, the steel standard sections can be combined into the required transverse bridge width for paving.

The C-shaped cold-formed thin-walled section steel 6 adopts the cold-formed and inner-rolled prefabricated channel steel with a bottom width of 200 × side height of 50 × small side 15 × wall thickness of 3 (cm), and the C-shaped cold-formed channel steel is formed in the factory. Round holes are drilled at the bottom of the beam end of the thin-walled steel 6. When the transverse bridge is assembled and connected, the cold-formed C-type cold-formed thin-walled steel limbs are aligned with the limbs, and self-tapping and self-drilling screws are used at a certain distance along the midline of the limbs. Connect so that it is connected as a whole along the transverse bridge direction.

The bottoms of the two ends of the C-shaped cold-formed thin-walled steel 6 are provided with support steel plates 7, the support steel plates 7 are stainless steel plates, and the size specification is length 186 × width 160 × thickness 15 (mm).

The C-type cold-formed thin-walled steel 6 and the bearing steel plate 7 are connected by M14 hexagonal bolts 13 with a diameter of 14 mm; Foam glue to prevent cement mortar from flowing into the continuous lower space of the bridge deck when concrete is poured.

The steel plate standard section 3 and the extension steel plate 4 are supported by the bearing steel plate on the cement mortar leveling layer cast on the upper surface of the prefabricated T beam 8 on site, and the cement mortar leveling layer is cast at a certain distance from the end of the prefabricated T beam 8. A smooth and flat cast-in-situ belt with a thickness of 5mm and a width of 160mm, and a layer of oil felt is laid on the cement mortar leveling layer. The bearing steel plate 7 can slide freely along the longitudinal bridge on the surface of the oil felt.

Stainless steel U-shaped drainage grooves 9 are arranged on both sides of the steel plate standard section 3. The U-shaped drainage groove includes a long steel edge 10, a short steel edge 11, and a waterproof sealant 12. The length of the U-shaped drainage groove 9 is The edge of the steel plate 10 is aligned with the back of the C-shaped steel, and is tightly connected with the extension steel plate 4 by self-tapping and self-drilling screws. The length of the U-shaped drainage groove 9 is determined according to the actual bridge width. Sealant 12 to prevent seepage from the screw holes.

Further, the extension steel plate 4 can be a processed thin steel plate alone, and the extension steel plate 4 is connected with the C-shaped cold-formed thin-walled steel 6 and the support steel plate 7 through self-tapping bolts.

Further, the extended steel plate 4 can be obtained in the following manner: the two side walls of the C-shaped cold-formed thin-walled steel 6 are cut off, and only the bottom plate is left at both ends to form the extended steel plate 4 , as shown in FIG. 7 .

Further, the extending steel plate 4 is provided with punching holes to improve the bonding force with the bridge deck concrete.

Example 2

The present embodiment provides a cold-formed thin-walled steel-concrete composite bridge deck continuous device and construction method that can be quickly assembled without welding, including the following steps:

Step 1: Prefabricate steel standard sections and U-shaped drainage grooves in the factory, including cutting C-shaped cold-formed thin-walled steel end limbs, specifically: C-shaped cold-formed thin-walled steel bottom plate at 200×50×15×3 Drill 4 bolt holes at each end of the beam, and at the same time drill four bolt holes at the corresponding positions on the support steel plate, and then connect the C-type cold-formed thin-walled steel and the support steel plate with M14 hexagonal bolts. The steel standard section is assembled and spliced with self-tapping and self-drilling screws along the transverse bridge direction to the required width, and then a 20mm thick foam glue with a length of 20mm along the transverse bridge direction is bonded to the outside of the support steel plate to prevent cement mortar from pouring concrete. It flows into the continuous lower space of the bridge deck; the standard section of the stainless steel U-shaped drainage channel is prefabricated in the factory, and the stainless steel plate is bent into a standard U-shaped drainage channel with the same length as the bridge width, 1mm thickness and 60mm, 60mm and 20mm width respectively. part;

Step 2: Clean the upper surface of the beam body at a certain distance from the beam end and cast a 5mm thick, 160mm wide, smooth and level cement mortar leveling layer;

Step 3: Use self-tapping and self-drilling screws to fix the U-shaped drainage channel on the extended steel plate of the cold-formed thin-walled steel at the bridge construction site;

Step 4: Embed waterproof sealant in the U-shaped drainage groove;

Step 5: Lay the bridge deck pavement steel mesh above the cold-formed thin-walled steel, and pour the bridge deck continuous concrete.

While adopting the above technical solutions, the following further technical solutions can also be adopted or combined:

In step 2, the cement mortar is made of M15 or above graded mortar, the plane height difference of the leveling layer is controlled at ±015cm, and a layer of linoleum is laid on it.

Example 3

As shown in Figure 8-12, the finite element simulation model of the cold-formed thin-walled steel-concrete composite deck continuous device is established, and the distribution of steel plates and material properties are simulated strictly according to the design conditions. The results show that under the action of different mid-span loads, the maximum longitudinal stress of the surface concrete of the device of the present invention is about 1.5MPa, indicating that the composite structure of the present invention has good vertical stiffness.

The protection scope of the present invention is not limited to the above-mentioned embodiments, and any modifications, equivalent replacements and improvements that can be made by professionals in the field within the spirit and principles of the present invention should be included in the protection of the present invention. within the range.

Claims (10)

1. A continuous device for a cold-formed thin-wall section steel-concrete combined bridge floor is characterized by comprising a steel standard section containing C-shaped cold-formed thin-wall section steel and a support steel plate;

the steel standard section is supported on a cement mortar leveling layer on the upper surface of the reinforced concrete prefabricated T beam;

the C-shaped cold-formed thin-walled steel is cold-formed internal-curling prefabricated channel steel, and limb backs are cut at two ends; the plurality of cold-formed C-shaped cold-formed thin-walled sections are connected into a whole along the transverse bridge direction, and T-shaped steel ribs are formed after the C-shaped cold-formed thin-walled sections are connected;

the support steel plate is connected with the bottom of the C-shaped cold-formed thin-wall section steel;

and U-shaped stainless steel drainage grooves are formed in two sides of the steel standard section, and waterproof sealants are embedded in the grooves.

2. A cold-formed thin-walled steel-concrete composite deck continuous system as claimed in claim 1, wherein a foam rubber is bonded to the outside of said steel plate support along the transverse direction of the bridge.

3. The cold-formed thin-walled steel-concrete composite deck continuous device of claim 2, wherein the cold-formed C-shaped cold-formed thin-walled steel is connected into a whole along the transverse bridge direction by self-tapping and self-drilling screws along the center line of the limb back in a way that the limb back is aligned with the limb back.

4. The continuous device for the cold-formed thin-wall section steel-concrete combined bridge floor of claim 3, wherein the U-shaped drainage channel comprises a long steel edge and a section steel edge, the long steel edge is aligned with the uncut limb back end of the section steel and is connected with the extending steel plate of the C-shaped cold-formed thin-wall section steel by self-tapping self-drilling screws; the extension steel plate is a thin steel plate which is connected with the C-shaped cold-formed thin-wall section steel and the support steel plate through self-tapping bolts.

5. The apparatus for continuously forming a cold-formed thin-walled steel-concrete composite deck according to claim 4, wherein said extension steel plate is formed by cutting two side walls of C-shaped cold-formed thin-walled steel, and leaving only a bottom plate at both ends.

6. The device for continuously forming the cold-formed thin-wall steel-concrete combined bridge floor as claimed in claim 5, wherein the C-shaped cold-formed thin-wall steel is connected with the support steel plate by using hexagon bolts.

7. The cold-formed thin-walled steel-concrete composite bridge deck continuous device of claim 6, wherein the cement mortar leveling layer is a smooth cast-in-place strip cast at a certain distance from the upper surface of the end of the reinforced concrete T-beam, and the support steel plate can slide on the surface of the cement mortar leveling layer along the longitudinal bridge direction.

8. The apparatus for continuously forming a cold-formed thin-walled steel-concrete composite bridge deck according to claim 7, wherein a layer of felt is applied on the smooth cement mortar leveling layer.

9. A construction method for providing a continuous device of cold-formed thin-walled steel-concrete composite deck according to any one of claims 1 to 8, comprising the steps of:

1) prefabricating C-shaped cold-formed thin-walled steel sections with drilled holes, support steel plates with drilled bolt holes, U-shaped drainage grooves and extension steel plates of the cold-formed thin-walled steel sections in a factory; assembling and splicing the C-shaped cold-formed thin-walled steel into a required width along the transverse bridge direction by self-tapping self-drilling screws according to the bridge width, connecting the C-shaped cold-formed thin-walled steel with a support steel plate by adopting M14 hexagonal bolts, and then bonding a piece of foam rubber which is 20mm thick and is completely long along the transverse bridge direction outside the support steel plate;

2) cleaning the upper surface of the beam body of the reinforced concrete prefabricated T beam away from the end part by a certain distance, and casting a smooth cement mortar leveling layer in a cast-in-place manner;

3) fixing the standard section of the U-shaped drainage channel on an extension steel plate of the cold-formed thin-wall section steel by adopting self-tapping and self-drilling screws in a construction site;

4) embedding waterproof sealant in the U-shaped drainage groove;

5) and paving a bridge deck pavement reinforcing mesh above the C-shaped cold-formed thin-walled steel section, and pouring bridge deck continuous concrete.

10. The welding-free rapid-assembling cold-formed thin-wall steel-concrete combined bridge deck continuous device and the construction method of claim 9, wherein the device comprises: in the step 2), the cement mortar adopts the mortar with the mark of M15, and the plane height difference of the leveling layer is controlled to be +/-015 cm.

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