A central dividing guardrail suitable for double-span top-pushing bridge and a construction method thereof

Abstract

The present invention provides a central dividing guardrail suitable for a double-span top-pushing bridge, comprising a steel panel, a steel transverse diaphragm, a seam-covering steel plate and a longitudinal partition plate. The seam-covering steel plate covers the longitudinal seam of the bridge, the longitudinal partition plate is vertically arranged on the seam-covering steel plate and arranged along the length of the bridge, there are two steel panels, arranged along the length of the bridge, and the two steel panels are symmetrically fixed on the bridge steel beams on both sides of the longitudinal seam of the bridge, the steel transverse diaphragm is arranged between the steel panel and the longitudinal partition plate along the transverse direction of the bridge, and concrete is poured between the steel panel and the longitudinal partition plate. The invention adopts a steel plate-concrete combined structure to give full play to the advantages of the two materials, and adopts the concept of permanent and temporary combination. In the top-pushing stage, the steel panel and the steel transverse diaphragm are used as temporary guardrails to ensure transportation safety during the construction stage, and the temporary steel structure guardrail is filled with concrete to become a permanent integral guardrail. At the same time, the design of the longitudinal partition plate avoids the problem of cracking and damage caused by different deformations between the two spans of the bridge.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge design and construction, and specifically relates to a central dividing guardrail suitable for a double-span jacking bridge and a construction method thereof, and is mainly used for highway and municipal road overpasses constructed by jacking. Background Art

[0002] Top-pushing construction has little impact on the railway and road transportation under the newly built bridge. Therefore, when building an overpass above a railway, or a busy highway or urban road, top-pushing construction is a more common construction method.

[0003] On high-grade roads such as expressways, first-class highways, and urban expressways, due to the high design speed, central median guardrails are installed in accordance with the specifications to prevent vehicles traveling in the opposite direction from entering the forward lane and causing traffic accidents. When the deck of the overpass is wide and the span of the bridge is not large, in order to reduce the lateral eccentric load effect of the beam structure and avoid uneven force, the bridge is generally made into a split-type structure, that is, a longitudinal seam is set between the two spans. In the case of only one guardrail in the central median, the guardrail is set in the middle of the two spans, that is, on the longitudinal seam of the bridge. If conventional reinforced concrete guardrails are used, there will be at least the following problems: (1) The formwork must be set up and poured after the left and right bridge sections are constructed, which takes a long time; (2) The newly poured guardrails inevitably connect the left and right bridge sections into a whole. When the deformation and settlement of the two bridge sections are inconsistent, the guardrails or even the beams will crack locally; (3) During the pouring and maintenance of the guardrails, steel bars, gravel, water, etc. may fall from the longitudinal joints, endangering the safety of traffic on the railway or highway under the bridge; (4) If the two-span bridge is constructed by section-by-section jacking, during the jacking stage, the guardrails on the outside of the single beam can be installed in advance and pushed together with the beam, but there is no guardrail on the side close to the center line, lacking edge protection, and there is a risk of people and equipment on the bridge deck falling under the bridge. Summary of the invention

[0004] The purpose of the present invention is to provide a central dividing guardrail suitable for a double-span jacking bridge, which can at least solve some of the defects existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A central dividing guardrail suitable for a double-span jacking bridge comprises a steel panel, a steel cross diaphragm, a seam covering steel plate and a longitudinal dividing plate. The seam covering steel plate covers the longitudinal seam of the bridge. The longitudinal dividing plate is vertically arranged on the seam covering steel plate and arranged along the full length of the bridge. There are two steel panels, which are arranged along the bridge. The two steel panels are symmetrically fixed to the bridge steel beams on both sides of the longitudinal seam with the longitudinal dividing plate as the symmetry axis. The steel cross diaphragm is arranged between the steel panel and the longitudinal dividing plate along the transverse direction of the bridge, and the steel cross diaphragms on both sides of the longitudinal dividing plate are symmetrically arranged. Concrete is poured between the steel panel and the longitudinal dividing plate.

[0007] Furthermore, a plurality of longitudinal stiffening rib steel plates are arranged on the side of the steel panel facing the longitudinal partition plate and are spaced apart along the height direction of the steel panel. The longitudinal stiffening rib steel plates are vertically connected to the steel panel and arranged along the longitudinal direction of the bridge. The longitudinal stiffening rib steel plates on the two steel panels are symmetrically arranged one by one.

[0008] Furthermore, the steel panel and the longitudinal stiffening rib steel plates on the steel panel are provided with a plurality of fractures along the direction of the bridge.

[0009] Furthermore, the steel panel includes a vertical section and an inclined section, the vertical section is parallel to the longitudinal partition plate, and its bottom is fixed on the bridge steel beam, the height of the vertical section is the same as the thickness of the bridge deck pavement layer, and the inclined section is inclined from the upper end of the vertical section toward the longitudinal partition plate.

[0010] Furthermore, there are multiple steel transverse partitions on both sides of the longitudinal partition plate, and they are evenly spaced along the longitudinal direction of the bridge. There is a spacing between two symmetrical steel transverse partitions on both sides of the longitudinal partition plate, and the spacing is equal to the width of the cover seam steel plate.

[0011] Furthermore, the above-mentioned central dividing guardrail also includes a top cover plate, which is a groove-type structure and is inverted on the top of the two steel panels. The top cover plate is fixed on one side of one of the steel panels.

[0012] Furthermore, the top surface of the top cover plate is provided with a bidirectional transverse slope.

[0013] Furthermore, the longitudinal partition plate is made of bamboo plywood.

[0014] In addition, the present invention also provides a construction method for the central dividing guardrail applicable to the double-span jacking bridge, comprising the following steps:

[0015] 1) Before the bridge is pushed forward, the steel panels and steel diaphragms are welded and fixed to the corresponding positions of the bridge steel beams, so that during the bridge push-up process, the steel structure guardrail composed of the steel panels and steel diaphragms on the side close to the center can be used as an edge protection structure;

[0016] 2) After the bridge is put into place, the longitudinal seam in the middle of the bridge is covered with a seam cover steel plate, and one side of the seam cover steel plate is fixed to the bridge steel beam;

[0017] 3) Place the longitudinal partition plate on the cover steel plate and fix it with auxiliary measures, and then pour concrete between the steel panel and the longitudinal partition plate;

[0018] 4) Install the top cover plate on the top surface of the concrete and fix one side of the top cover plate on one of the steel panels.

[0019] The present invention also provides a double-span jacking bridge, comprising a left-span bridge steel beam, a right-span bridge steel beam, concrete guardrails and steel plate anti-parabolic wall arranged on the outside of the left-span bridge steel beam and the right-span bridge steel beam, and the above-mentioned central dividing guardrail; a longitudinal seam is provided between the left-span bridge steel beam and the right-span bridge steel beam, the seam covering steel plate is covered on the longitudinal seam, the two steel panels are symmetrically fixed to the left-span bridge steel beam and the right-span bridge steel beam respectively, and the steel cross diaphragm is welded and fixed to the bridge steel beam on the corresponding side.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The central dividing guardrail suitable for a double-span jacking bridge provided by the present invention adopts a steel plate-concrete combined structure. The steel structure is lightweight, high-strength, and has good plasticity, and is suitable for manufacturing structures of various shapes. The concrete structure has greater rigidity and better economy. The concept of combining permanent and temporary materials is adopted, and the advantages of the two materials are fully utilized. During the jacking stage, the steel panel and the steel cross partition can be used as temporary guardrails to ensure the transportation safety of personnel and machinery on the bridge and the railway and highway under the bridge during the construction stage. At the same time, filling concrete in the temporary steel structure guardrail can become a permanent integral guardrail.

[0022] (2) The central dividing guardrail provided by the present invention, which is suitable for a double-span jacking bridge, covers the longitudinal seam between the double-span bridges with a seam-covering steel plate to prevent rainwater and debris from falling under the bridge through the longitudinal seam. At the same time, the central dividing guardrail is structurally separated by a longitudinal dividing plate, which can effectively prevent cracking and damage caused by different deformations between the two spans.

[0023] (3) The steel panel in the central dividing guardrail suitable for a double-span jacking bridge provided by the present invention serves not only as a part of the permanent guardrail but also as a template for pouring internal concrete, and the construction is convenient and quick.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional schematic diagram of the double-span jacking bridge of the present invention;

[0026] Figure 2It is a schematic diagram of the cross section of the bridge during single-span jacking in the present invention;

[0027] Figure 3 is a cross-sectional schematic diagram of the central dividing guardrail of the present invention;

[0028] Figure 4 It is a layout drawing of the steel panel in the present invention;

[0029] Figure 5 It is a large-scale drawing of the steel diaphragm in the present invention.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. Left bridge steel beam; 2. Central dividing guardrail; 3. Right bridge steel beam; 4. Concrete guardrail; 5. Steel plate anti-parabolic wall; 6. Longitudinal seam; 7. Seam cover steel plate; 8. Steel panel; 9. Steel cross diaphragm; 10. Longitudinal dividing plate; 11. Concrete; 12. Longitudinal stiffening rib steel plate; 13. Top cover plate; 14. Bridge deck pavement; 15. Vertical section; 16. Inclined section. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] like Figure 3 , Figure 4 and Figure 5As shown, this embodiment provides a central dividing guardrail suitable for a double-span jacking bridge, including a steel panel 8, a steel transverse diaphragm 9, a seam covering steel plate 7 and a longitudinal dividing plate 10. The seam covering steel plate 7 covers the longitudinal seam 6 of the bridge to prevent rainwater and debris from falling under the bridge through the longitudinal seam 6; the longitudinal dividing plate 10 is vertically arranged on the seam covering steel plate 7 and arranged along the entire length of the bridge. Specifically, the longitudinal dividing plate 10 is made of bamboo plywood with a certain thickness; there are two steel panels 8, which are arranged along the length of the bridge, and the two steel panels 8 are symmetrically fixed to the bridge steel beams on both sides of the longitudinal seam 6 with the longitudinal dividing plate 10 as the symmetry axis; the steel transverse diaphragm 9 is arranged between the steel panel 8 and the longitudinal dividing plate 10 along the transverse direction of the bridge, and the steel transverse diaphragms 9 on both sides of the longitudinal dividing plate 10 are symmetrically arranged; concrete 11 is poured between the steel panel 8 and the longitudinal dividing plate 10. The central dividing guardrail adopts a steel plate-concrete combined structure. The steel structure is lightweight, high-strength and has good plasticity, and is suitable for manufacturing structures of various shapes. The concrete structure has greater rigidity and better economy. At the same time, the concept of permanent and temporary combination is adopted to give full play to the advantages of the two materials. In the jacking stage, the steel panel 8 and the steel cross partition 9 can be used as temporary guardrails to ensure the transportation safety of personnel and machinery on the bridge and the railway and highway under the bridge during the construction phase. After the bridge is jacked into shape, concrete 11 can be filled in the temporary steel structure guardrail to quickly form a permanent integral guardrail, and the central dividing guardrail is structurally separated by the longitudinal partition plate 10, effectively avoiding cracking and damage caused by different deformations between the two bridges at the same time.

[0034] Optimized, in order to further improve the rigidity of the steel structure of the central partition guardrail, such as Figure 3 As shown, the steel panel 8 is provided with a plurality of longitudinal stiffening rib steel plates 12 spaced apart along the height direction of the steel panel 8 on the side facing the longitudinal partition plate 10. The longitudinal stiffening rib steel plates 12 are vertically connected to the steel panel 8 and arranged along the bridge direction; the longitudinal stiffening rib steel plates 12 on the two steel panels 8 are symmetrically arranged one by one. Furthermore, the steel panel 8 and the longitudinal stiffening rib steel plates 12 on the steel panel 8 are provided with a plurality of fractures along the bridge direction to prevent the guardrail from being subjected to stress and causing its fracture during the jacking process; specifically, the steel panel 8 and the longitudinal stiffening rib steel plates 12 on the steel panel 8 are provided with a section every 6 to 8 meters along the bridge direction, and a 5 mm wide fracture is provided between the two sections.

[0035] For a specific structure of the steel panel 8, one embodiment is as follows: Figure 4As shown, the steel panel 8 includes a vertical section 15 and an inclined section 16, the vertical section 15 is parallel to the longitudinal partition plate 10, and its bottom is fixed on the bridge steel beam, the height of the vertical section 15 is the same as the thickness of the bridge deck pavement layer 14, and the inclined section 16 is inclined from the upper end of the vertical section 15 toward the longitudinal partition plate 10. The inclined structural design of the upper section of the steel panel 8 makes the central dividing guardrail have a narrow upper and wide lower structure, which ensures the structural stress of the central dividing guardrail and has a more beautiful appearance.

[0036] The structure of the steel diaphragm 9 is refined, such as Figure 5 As shown, the contour line of the steel diaphragm 9 close to the steel panel 8 is consistent with the contour line of the cross section of the steel panel 8 and is connected to the steel panel 8. The contour line of the steel diaphragm 9 close to the longitudinal partition 10 is parallel to the longitudinal partition 10. There is a spacing between the two symmetrical steel diaphragms 9 on both sides of the longitudinal partition 10, and the spacing is equal to the width of the seam cover steel plate 7. During construction, the bottom of the steel diaphragm 9 close to the longitudinal partition 10 is in contact with the side of the seam cover steel plate 7, which is convenient for positioning and construction. Optimally, there are multiple steel diaphragms 9 on both sides of the longitudinal partition 10, and they are evenly spaced along the bridge direction, further improving the rigidity of the central partition guardrail; at the same time, the steel diaphragm 9 and the longitudinal stiffening rib steel plate 12 are both arranged inside the concrete 11, which strengthens the rigidity of the concrete 11, so that when the concrete 11 is poured, it is sufficient to fill it with plain concrete without the need to set steel bars inside.

[0037] In an optimized implementation, a top cover plate 13 is further provided on the top surfaces of the two steel panels 8 and the concrete 11. The top cover plate 13 is a groove-shaped structure, which is inverted on the top of the two steel panels 8. The top cover plate 13 is fixed on one side of one of the steel panels 8 to prevent rainwater from entering the interior of the central dividing guardrail. Furthermore, the top surface of the top cover plate 13 is provided with a two-way horizontal slope to facilitate rainwater to slide to both sides.

[0038] The specific construction process of the above-mentioned central dividing guardrail is as follows:

[0039] (1) Before the bridge is pushed forward, the steel panels 8 and the steel diaphragms 9 are welded and fixed to the corresponding positions of the bridge steel beams, so that during the bridge pushing process, the steel structure guardrail composed of the steel panels 8 and the steel diaphragms 9 on the side close to the center can serve as an edge protection structure;

[0040] (2) After the bridge is put into place, the longitudinal seam 6 in the middle of the bridge is covered with a seam cover steel plate 7, and one side of the seam cover steel plate 7 is fixed to the bridge steel beam;

[0041] (3) placing the longitudinal partition plate 10 on the cover steel plate 7 and fixing it with auxiliary measures, and then pouring concrete 11 between the steel panel 8 and the longitudinal partition plate 10;

[0042] (4) The top cover plate 13 is installed on the top surface of the concrete 11, and the top cover plate 13 is fixed on one side of the steel panels 8.

[0043] The central dividing guardrail of the above embodiment is applied to a double-span push-pushing bridge. The specific structure of the double-span push-pushing bridge is as follows: Figure 1 and Figure 2 As shown, it includes a left bridge steel beam 1, a right bridge steel beam 3, a concrete guardrail 4 and a steel plate anti-parabolic wall 5 arranged on the outside of the left bridge steel beam 1 and the right bridge steel beam 3, and the above-mentioned central dividing guardrail 2; a longitudinal seam 6 is provided between the left bridge steel beam 1 and the right bridge steel beam 3, and the seam covering steel plate 7 is covered on the longitudinal seam 6, the two steel panels 8 are symmetrically fixed to the left bridge steel beam 1 and the right bridge steel beam 3 respectively, and the steel cross diaphragm 9 is welded and fixed to the bridge steel beam on the corresponding side.

[0044] In addition, this embodiment takes a national highway overpass across the railway, which uses a 3×20m span steel box girder and a top-pushing construction as an example for specific description. The total width of the bridge deck is 26.2m, and a double-width split structure is adopted in the transverse direction. The width of a single bridge steel beam is 13.09m, and a 2cm longitudinal seam is set between the two bridge steel beams. A concrete guardrail and a steel plate anti-parabolic wall are set on the outside of the bridge, and a central dividing guardrail of this embodiment is set in the center.

[0045] The central dividing guardrail is a steel plate-concrete composite structure with a width of 500 mm and a total height of 1080 mm, of which the height above the road surface is 900 mm. The design of each component is as follows: (1) Steel panel, thickness 12 mm; (2) Longitudinal stiffening rib steel plate, width 100 mm, thickness 10 mm, 4 on each side, symmetrically arranged; (3) Steel cross diaphragms, thickness 10 mm, symmetrically arranged on the left and right, with a spacing of 50 mm between the two panels, and a pair of steel cross diaphragms set every 1.5 m along the longitudinal direction of the bridge; (4) Seam cover steel plate, width 50 mm, thickness 4 mm, single-sided spot welding fixed to the left bridge steel beam; (5) Steel top cover plate, grooved structure, buckled on the top surface of the guardrail, with a total cross-sectional width of 290 mm, single-sided fixed to the left steel panel; (6) Longitudinal dividing plate, using 7 mm thick bamboo plywood; (7) C25 lightweight concrete filled in the guardrail.

[0046] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A central dividing guardrail suitable for a double-span jacking bridge, characterized in that: It includes a steel panel, a steel cross diaphragm, a seam cover steel plate and a longitudinal partition plate. The seam cover steel plate is connected to the longitudinal seam of the bridge. The longitudinal partition plate is vertically arranged on the seam cover steel plate and arranged along the length of the bridge. There are two steel panels, which are arranged along the bridge, and the two steel panels are symmetrically fixed to the bridge steel beams on both sides of the longitudinal seam with the longitudinal partition plate as the symmetry axis. The steel cross diaphragm is arranged between the steel panel and the longitudinal partition plate along the transverse direction of the bridge, and the steel cross diaphragms on both sides of the longitudinal partition plate are symmetrically arranged. Concrete is poured between the steel panel and the longitudinal partition plate.

2. A central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 1, characterized in that: The steel panel is provided with a plurality of longitudinal stiffening rib steel plates spaced apart along the height direction of the steel panel on the side facing the longitudinal partition plate. The longitudinal stiffening rib steel plates are vertically connected to the steel panel and arranged along the longitudinal direction of the bridge. The longitudinal stiffening rib steel plates on the two steel panels are symmetrically arranged one by one.

3. A central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 2, characterized in that: The steel panel and the longitudinal stiffening rib steel plate on the steel panel are provided with a plurality of fractures along the longitudinal direction of the bridge.

4. The central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 1, characterized in that: The steel panel includes a vertical section and an inclined section. The vertical section is parallel to the longitudinal partition plate, and its bottom is fixed on the bridge steel beam. The height of the vertical section is the same as the thickness of the bridge deck pavement layer, and the inclined section is inclined from the upper end of the vertical section toward the longitudinal partition plate.

5. The central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 1, characterized in that: There are multiple steel transverse partitions on both sides of the longitudinal partition plate, and they are evenly spaced along the longitudinal direction of the bridge. There is a spacing between two symmetrical steel transverse partitions on both sides of the longitudinal partition plate, and the spacing is equal to the width of the cover seam steel plate.

6. The central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 1, characterized in that: It also includes a top cover plate, which is a groove-shaped structure and is inverted on the top of the two steel panels. The top cover plate is fixed on one of the steel panels at one side.

7. A central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 6, characterized in that: The top surface of the top cover plate is provided with a bidirectional transverse slope.

8. The central dividing guardrail suitable for a double-span jacking bridge as claimed in claim 1, characterized in that: The longitudinal partition plate is made of bamboo plywood.

9. The construction method of the central dividing guardrail applicable to a double-span jacking bridge according to any one of claims 1 to 8, characterized in that: The steps include: 1) Before the bridge is pushed forward, the steel panels and steel diaphragms are welded and fixed to the corresponding positions of the bridge steel beams, so that during the bridge push-up process, the steel structure guardrail composed of the steel panels and steel diaphragms on the side close to the center can be used as an edge protection structure; 2) After the bridge is put into place, the longitudinal seam in the middle of the bridge is covered with a seam cover steel plate, and one side of the seam cover steel plate is fixed to the bridge steel beam; 3) Place the longitudinal partition plate on the cover steel plate and fix it with auxiliary measures, and then pour concrete between the steel panel and the longitudinal partition plate; 4) Install the top cover plate on the top surface of the concrete and fix one side of the top cover plate on one of the steel panels.

10. A double-span jacking bridge, characterized in that: It includes a left bridge steel beam, a right bridge steel beam, concrete guardrails and steel plate anti-parabolic wall arranged on the outside of the left bridge steel beam and the right bridge steel beam, and a central dividing guardrail as described in any one of claims 1 to 8; a longitudinal seam is provided between the left bridge steel beam and the right bridge steel beam, the seam covering steel plate is covered on the longitudinal seam, the two steel panels are symmetrically fixed to the left bridge steel beam and the right bridge steel beam respectively, and the steel cross diaphragm is welded and fixed to the bridge steel beam on the corresponding side.

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