CN218562064U - Light wide-width steel-UHPC combined cover beam - Google Patents

Abstract

The utility model discloses a light-duty broad width steel-UHPC combination bent cap, its bent cap single-section includes bent cap main part and UHPC pier. The utility model has simple structure, clear force transmission characteristics, good integrity, simple prefabricating process and high forming speed, can be quickly prefabricated and processed in factories, and can weld and assemble the main body structure of the steel bent cap, thereby shortening the difficulty and the time of prefabricating the bent cap; the main body of the bent cap adopts a steel structure, and the UHPC is locally adopted to improve the structural stress performance, so that the dead weight of the bent cap is effectively reduced, the sections of the prefabricated bent cap in the wide bridge are divided into fewer sections, the weight and the size of the sections meet the bearing capacity of urban bridge roads, the installation difficulty of a construction site is reduced, the construction speed is improved, and the construction cost is saved; the steel and the UHPC are combined by reasonably designing the structural size, so that the steel plate bears the tensile stress, the UHPC material bears the compressive stress locally, the stress performance of the two materials is fully exerted, and the economic benefit is improved.

Description

Light wide-width steel-UHPC combined cover beam

Technical Field

The utility model relates to an urban bridge component and construction technical field, concretely relates to be applicable to city broad width overpass steel-Ultra High Performance Concrete (UHPC) combination bent cap.

Background

Along with the rapid development of urban bridge construction, the existing traditional cast-in-place pier support is gradually exposed, so that the cost is high, the safety risk is high, the environmental pollution is serious, and the brought problems of traffic closure and the like are solved. In order to reduce the influence of urban bridge construction on road traffic and the life of surrounding residents and accelerate the construction speed, the construction technology of the fabricated bridge taking 'rapidity, factory production, assembly and greening' as a core target is rapidly developed, and meanwhile, the assembly of bridge members is gradually popularized to an upper structure or even a full bridge from prefabricated beam plates, so that the urban bridge gradually goes up to a road of full-prefabricated assembly construction, wherein the prefabricated members comprise but are not limited to main beams, piers, abutment platforms, cover beams and the like.

In the prior art, the prefabricated capping beam generally takes two forms: one is an integral fully prefabricated bent cap; the other is a segmented fully prefabricated capping beam. If the integral prefabrication is adopted, the common reinforced concrete bent cap component has large size and self weight, so that higher requirements on transportation and hoisting equipment are met, and meanwhile, the urban road bearing capacity is limited, so that the transportation of the integrally prefabricated large reinforced concrete bent cap is difficult to meet, and overload is difficult to avoid. If the segmental prefabrication is adopted, the water seepage phenomenon is easy to occur at the joint, the durability of the component is influenced, and the longitudinal ribs are segmented to cause discontinuity on the segmentation interface, so that good continuous force transmission cannot be carried out. Meanwhile, the prefabricated capping beam and the prefabricated pier stud are assembled by adopting a pre-buried grouting sleeve, a metal corrugated pipe or a pre-stressed steel strand, and the requirements on the construction positioning accuracy of the pre-buried part and the pre-buried steel bar are higher, so that the redundancy of on-site construction adjustment is smaller, the construction difficulty is higher, and the connection integrity is poor.

Ultra-High Performance Concrete (UHPC) is considered as the most innovative cement-based composite material in the last 30 years, and the excellent mechanical properties of the Ultra-High Performance Concrete can meet the requirements of bridge engineering such as large span, light weight, thin wall and the like. The steel-UHPC combined structure can fully utilize the tensile property of steel and the compressive property of concrete, and is continuously popularized and applied in engineering. Therefore, the steel beam is used as the main body of the capping beam, the common concrete is replaced by the lightweight high-strength ultra-high performance concrete in the root compression area to form the steel-UHPC combined capping beam, the tensile property of the steel beam and the high compression resistance and high bending and pulling toughness of the UHPC material can be fully utilized, and the steel-UHPC combined capping beam has the advantages of light dead weight, high strength, good durability, low structural height and high assembly rate.

SUMMERY OF THE UTILITY MODEL

In view of this, the large-scale prefabricated bent cap that exists to the prefabricated reinforced concrete bent cap of present city broad width bridge dead weight is too big, and the prefabrication process is complicated, and hoist and mount transport and pre-buried reinforcing bar location difficulty scheduling problem, the utility model provides a light-duty broad width steel-UHPC combination bent cap to solve not enough among the prior art.

In order to achieve the above purpose, the purpose of the present invention is achieved by the following technical solutions:

the utility model provides a light-duty broad width steel-UHPC combination bent cap, is formed by connecting gradually a plurality of bent cap single segments, bent cap single segment includes bent cap main part and UHPC pier, wherein:

the capping beam main body is transversely and bilaterally symmetrically arranged by taking the UHPC bridge pier as a center and comprises a top plate, a bottom plate and beam end sealing plates, wherein the top surface of the top plate is flush with the top surface of the UHPC bridge pier, transverse partition plates are arranged between the top plate and the bottom plate at intervals, and a first UHPC pouring section is arranged from the joint of the bottom plate and the UHPC bridge pier to the middle part of the bottom plate;

the UHPC bridge pier is internally provided with bridge pier main ribs which are vertically arranged, the connecting end of the UHPC bridge pier main body and the bent cap main body is formed by longitudinally and transversely connecting transverse bridge direction clapboards and longitudinal bridge direction clapboards, the cross section of the connecting end is in a shape like a Chinese character 'hui', the outer surrounding closed cavity in the shape like the Chinese character 'hui' is a second UHPC pouring section, the inner surrounding closed cavity in the shape like the Chinese character 'hui' is a third UHPC pouring section, and connecting reinforcing steel bars which are vertically arranged and the lower ends of the connecting reinforcing steel bars extend downwards are arranged in the third UHPC pouring section.

According to the light-weight wide-width steel-UHPC combined cover beam, the longitudinal section of the bottom plate is in a parabolic shape extending from the joint of the bottom plate and the UHPC bridge pier to the bottom end of the beam-end sealing plate.

According to the light wide-width steel-UHPC combined cover beam, the PBL key plate and the PBL key steel bar are arranged in the first UHPC pouring section, and the tail end of the first UHPC pouring section located in the middle of the bottom plate is provided with the steel baffle.

According to the light wide steel-UHPC combined cover beam, the diaphragm plate is rectangular, the center of the diaphragm plate is a reinforced manhole, and reinforcing ribs are arranged on the opposite surfaces of the top plate and the bottom plate, the opposite surfaces of the two transverse frames of the diaphragm plate and the opposite surfaces of the two vertical frames of the diaphragm plate.

According to the light wide steel-UHPC combined cover beam, the top surface of the top plate is provided with the support base plate at intervals, and the lower end surface of the support base plate is provided with the reinforcing ribs.

According to the light wide-width steel-UHPC combined cover beam, the transverse bridge-direction partition plates comprise a group of outer transverse bridge-direction partition plates and a group of inner transverse bridge-direction partition plates, the longitudinal bridge-direction partition plates comprise a group of outer longitudinal bridge-direction partition plates and a group of inner longitudinal bridge-direction partition plates, two ends of each inner longitudinal bridge-direction partition plate are welded on the outer transverse bridge-direction partition plates, and two ends of each inner transverse bridge-direction partition plate are welded on the inner longitudinal bridge-direction partition plates.

According to the light wide-width steel-UHPC combined capping beam, the shear nails are arranged on the opposite surfaces of the outer longitudinal direction bridge-direction partition plate and the inner longitudinal direction bridge-direction partition plate, the opposite surfaces of the outer transverse direction bridge-direction partition plate and the inner transverse direction bridge-direction partition plate, and the opposite surfaces of the two outer transverse direction bridge-direction partition plates.

According to the light-weight wide-width steel-UHPC combined capping beam, the compressive strength of UHPC materials poured by the first UHPC pouring section, the second UHPC pouring section and the third UHPC pouring section is more than or equal to 120MPa, and the elastic modulus is more than or equal to 40GPa.

The utility model discloses technical scheme's beneficial effect is:

1. the utility model provides a light-duty broad width steel-UHPC combination bent cap, simple structure, the power transmission characteristic is clear and definite, can prefabricate processing fast in the mill, the welding assembles steel bent cap major structure, and the wholeness is good, compares in precast concrete bent cap, and the prefabrication process is simple, and shaping speed is fast, has shortened the prefabricated degree of difficulty and the time of bent cap;

2. the utility model provides a light-duty broad width steel-UHPC combination bent cap to the bent cap main part adopts the steel construction, the local ultrahigh performance concrete (UHPC) that adopts improves the structure atress performance, consequently effectively reduced the bent cap dead weight, make in the broad width bridge, the segment section of prefabricated bent cap can be divided into less, segment section weight and size satisfy the road bearing capacity of city bridge, can accomplish in transportation and hoist and mount process with current hoisting equipment, need not to seek large-scale hoisting equipment specially, the installation degree of difficulty of construction site has been reduced, construction speed is improved, construction cost is saved;

3. the utility model provides a light-duty broad width steel-UHPC combination bent cap combines together steel and Ultra High Performance Concrete (UHPC), through reasonable design structure size, the form, make the steel sheet undertake tensile stress, the compressive stress is undertaken at the part to the UHPC material, the atress performance of two kinds of materials of full play, improve economic benefits, its both sides bent cap slope bottom plate extends to beam-ends shrouding department by the root with certain parabola, can be better clear and definite pass the power route, the bolster plate interval of its bent cap and the matching of current multi-disc little case roof beam or I-beam width, especially for city broad width bridge, the suitability is better;

4. the utility model provides a light-duty broad width steel-UHPC combination bent cap, it is different with traditional mode with prefabricated UHPC pier hookup location structure at the bent cap, the bent cap is equipped with junction outside diaphragm and the inboard diaphragm of junction at the hookup location, for with the atress performance phase-match, the cavity steel sheet keeps the longitudinal bridge to lining up, the welding of the lateral bridge is on the longitudinal bridge is to the diaphragm, the inside shear force nail that is equipped with of cavity, during the field connection, pier main muscle in the prefabricated UHPC pier passes the direct bent cap top of bent cap horizontal floor preformed hole, the hole completion is pour in the rethread reservation, can effectively avoid site operation reinforcing bar location difficulty, the big scheduling problem of the construction degree of difficulty, the linkage segment has better wholeness.

Drawings

To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of the overall structure of the preferred embodiment of the present invention;

FIG. 2 is a front view of a single-section longitudinal half-section of a light-gauge broad-width steel-UHPC composite bent cap according to a preferred embodiment of the present invention;

FIG. 3 is a top view of a single section of a preferred embodiment of the present invention of a lightweight broad gauge steel-UHPC composite capping beam (the seat plate is not shown);

fig. 4 isbase:Sub>A sectional view of the light-weight broad-width steel-UHPC combined bent cap according to the cross-sectional structure of fig. 2 frombase:Sub>A-base:Sub>A;

fig. 5 is a sectional view of a light-weight broad-width steel-UHPC combined bent cap according to a cross-sectional structure of fig. 2 from B to B;

fig. 6 is a cross-sectional view of the light-weight broad-width steel-UHPC combined bent cap according to the cross-sectional structure of fig. 2 in the direction of C-C;

fig. 7 is a sectional view of a light-weight broad-width steel-UHPC combined bent cap according to a cross-sectional structure of fig. 2 in a direction of D-D;

fig. 8 is a sectional view of the light broad width steel-UHPC combined bent cap according to the structure of the section E-E in fig. 2 according to the preferred embodiment of the present invention;

fig. 9 is a sectional view of the light broad width steel-UHPC composite bent cap according to the cross-sectional structure of fig. 2 from F to F;

in the figure: 1. a capping beam single segment; 2. a cap beam body; 3. a UHPC pier; 4. a top plate; 5. a base plate; 6. a beam-end seal plate; 7. a diaphragm plate; 8. a first UHPC casting section; 9. main bridge pier ribs; 10. a second UHPC casting section; 11. a third UHPC pouring section; 12. connecting reinforcing steel bars; 13. a PBL keypad; 14. PBL bond reinforcing steel; 15. a steel baffle plate; 16. a reinforced manhole; 17. a reinforcing rib; 18. a support base plate; 19. an outer transverse bridge-direction clapboard; 20. an inner transverse bridge-direction clapboard; 21. an outer longitudinal axial partition; 22. an inner longitudinal axial baffle; 23. a shear pin; 24. and reserving a pouring hole.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, which are not intended to limit the present invention.

Referring to fig. 1 to 9, the light-duty broad width steel-UHPC combined capping beam of the present invention is formed by connecting a plurality of capping beam single segments 1 in sequence, and the capping beam is suitable for a broad width bridge with a bridge width of more than or equal to 20m and is of a fully prefabricated structure.

Referring to fig. 2, the bent cap single-segment 1 comprises a bent cap main body 2 and a UHPC pier 3, wherein the bent cap main body 2 is of a steel structure and is transversely and bilaterally symmetrically arranged by taking the UHPC pier 3 as a center, and specifically comprises a top plate 4, a bottom plate 5 and a beam end closing plate 6, the top surface of the top plate 2 is flush with the top surface of the UHPC pier 3, a diaphragm plate 7 is arranged between the top plate 4 and the bottom plate 5 at an interval, a first UHPC pouring segment 8 is arranged from the joint of the bottom plate 5 and the UHPC pier 3 to the middle position of the bottom plate 5, and the first UHPC pouring segment 8 can be hoisted together with a steel cantilever after the pouring in a factory is completed in advance.

Referring to fig. 2 and 3, the UHPC pier 3 is provided with pier main ribs 9 arranged vertically, and it is easily understood that the length of the pier main ribs 9 is substantially identical to that of the UHPC pier 3. The cross section of the connecting end of the UHPC pier 3 and the bent cap main body 2 is in a shape like a Chinese character 'hui', the outer surrounding containing cavity in the shape like a Chinese character 'hui' is a second UHPC pouring section 10, the inner surrounding containing cavity in the shape like a Chinese character 'hui' is a third UHPC pouring section 11, and connecting steel bars 12 which are vertically arranged and the lower ends of which extend downwards are arranged in the third UHPC pouring section 11.

With continued reference to figure 2, the longitudinal cross-section of the floor 5 is parabolic from the junction with the UHPC pier 3 to the bottom end of the beam end closure plate 6 to better define the force transfer path.

The PBL key plate 13 and the PBL key steel bar 14 are arranged in the first UHPC pouring section 8, the distance meets the standard requirement, and 200mm is preferably selected in the scheme. And a steel baffle plate 15 is arranged at the tail end of the first UHPC pouring section 8 positioned in the middle of the bottom plate 5.

Referring to fig. 7, the diaphragm plate 7 is rectangular and has a reinforcing manhole 16 at the center, and reinforcing ribs 17 for increasing bending resistance and shearing resistance are provided on the facing surfaces of the top plate 4 and the bottom plate 5, on the facing surfaces of the two transverse frames of the diaphragm plate 7, and on the facing surfaces of the two vertical frames of the diaphragm plate 7, and the distance between the reinforcing ribs 17 meets the specification requirement, in this case, the distance is preferably 200mm.

The top surface of the top plate 4 is provided with support base plates 18 at intervals for supporting the upper structure, the interval between the support base plates 18 is preferably 3200mm, and the lower end surfaces of the support base plates 18 are provided with reinforcing ribs 17 for increasing the bending resistance and the shearing resistance so as to improve the local pressure-bearing capacity.

Referring to fig. 3, 4 and 5, the transverse direction webs include a group of outer transverse direction webs 19 and a group of inner transverse direction webs 20, and the longitudinal direction webs include a group of outer longitudinal direction webs 21 and a group of inner longitudinal direction webs 22, for matching the stress performance, both ends of the inner longitudinal direction webs 22 are welded to the outer transverse direction webs 19, and both ends of the inner transverse direction webs 20 are welded to the inner longitudinal direction webs 22.

Shear nails 23 for improving bending resistance and shearing resistance are arranged on the opposite surfaces of the outer longitudinal direction bridge diaphragm 21 and the inner longitudinal direction bridge diaphragm 22, on the opposite surfaces of the outer transverse direction bridge diaphragm 19 and the inner transverse direction bridge diaphragm 20 and on the opposite surfaces of the two outer transverse direction bridge diaphragms 19 so as to improve the bearing capacity of the steel structure capping beam.

The compressive strength of UHPC materials poured by the first UHPC pouring section 8, the second UHPC pouring section 10 and the third UHPC pouring section 11 is more than or equal to 120MPa, the elastic modulus is more than or equal to 40GPa, and the purposes of light weight, high strength and high rigidity of the wide-width steel-UHPC combined cover beam are more easily realized.

With continued reference to fig. 1, the top plates of the second UHPC casting section 10 and the third UHPC casting section 11 formed by the inner cavity of the UHPC to be cast in situ are provided with reserved casting holes 24 to meet the requirement of casting UHPC concrete in situ with the prefabricated UHPC bridge pier in situ.

The manufacturing method of the light wide steel-UHPC combined capping beam structure comprises the following steps:

s1, designing the structural form and size of a light wide steel-UHPC combined cover beam, wherein the cross section of the cover beam is in a polygonal cross section form, in the preferred embodiment, the height of the root part of the cover beam is 1400mm, the height of the end part of the cover beam is 800mm, the width of the cover beam is 1600mm, and the distance between diaphragm plates 7 is 1500mm.

And S2, welding a top plate 4, a bottom plate 5, a beam end sealing plate 6 and a diaphragm plate 7 in a factory, and welding reinforcing ribs 17 and shear pins 23 on corresponding steel plates. Preferably, the thickness of the top plate 4 is 20mm, the thickness of the bottom plate 5 is 30mm, the thicknesses of the beam end sealing plate 6, the diaphragm plate 7, the steel baffle plate 15 of the UHPC pouring section, the transverse bridge diaphragm plate and the longitudinal bridge diaphragm plate are all more than or equal to 20mm, the distance between the reinforcing ribs 17 is 200mm, the diameter of the shear nail 23 is 22mm, and the distance between the reinforcing ribs is 200mm.

S3, installing and welding a support base plate 18 at the corresponding position of the top plate 4, arranging reinforcing ribs 17 at the lower part of the support base plate 18, wherein the distance between the reinforcing ribs 17 is 200mm to strengthen the local pressure-bearing capacity, determining the position of a reserved pouring hole 24, and preferably selecting the diameter of the reserved pouring hole 24 to be 60mm.

S4, embedding the PBL key plate 13 and the PBL key steel bars 14, wherein the diameter of the opening is 100mm, the diameter of the adopted steel bars is 20mm, the distance meets the specification requirement, and the distance is preferably 200mm. Assembling and pouring the die according to the designed structural form and size of the bent cap, pouring ultra-high performance concrete (UHPC) at the joint of the prefabricated UHPC pier and the root lower edge pressure-bearing area into the die, and performing high-temperature steam curing or natural curing on the poured ultra-high performance concrete (UHPC).

And S5, after the maintenance meets the requirement, removing the mold to finish the manufacture of the light wide steel-UHPC combined capping beam structure.

When the prefabricated UHPC bridge pier is connected with the light wide-width steel-UHPC combined cover beam in site construction, the main bridge pier reinforcement in the prefabricated UHPC bridge pier is ensured to penetrate through the reserved hole of the horizontal bottom plate of the cover beam to be directly connected with the top of the cover beam, and pouring is completed through the reserved pouring hole, so that the problems of difficult positioning, high construction difficulty and the like of the steel bar in site construction can be effectively solved, and the connecting section has better integrity.

The above is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, and it should be appreciated by those skilled in the art that various equivalent substitutions and obvious changes made in the specification and drawings should be included within the scope of the present invention.

Claims (8)

1. The utility model provides a light-duty broad width steel-UHPC combination bent cap which characterized in that is formed by connecting gradually a plurality of bent cap single segments, bent cap single segment includes bent cap main part and UHPC pier, wherein:

the capping beam main bodies are transversely and bilaterally symmetrically arranged by taking the UHPC bridge pier as a center and comprise top plates, bottom plates and beam end sealing plates, the top surfaces of the top plates are flush with the top surfaces of the UHPC bridge pier, transverse partition plates are arranged between the top plates and the bottom plates at intervals, and a first UHPC pouring section is arranged from the joint of the bottom plates and the UHPC bridge pier to the middle of the bottom plates;

the UHPC bridge pier is internally provided with bridge pier main reinforcements which are vertically arranged, the connecting end of the UHPC bridge pier and the bent cap main body is formed by vertically and horizontally connecting transverse bridge direction partition plates and longitudinal bridge direction partition plates, the cross section of the connecting end is in a shape like a Chinese character 'hui', the outer periphery closed cavity in the shape like the Chinese character 'hui' is a second UHPC pouring section, the inner periphery closed cavity in the shape like the Chinese character 'hui' is a third UHPC pouring section, and connecting reinforcing steel bars which are vertically arranged and the lower ends of the connecting reinforcing steel bars extend downwards are arranged in the third UHPC pouring section.

2. The light-weight broad-width steel-UHPC composite bent cap according to claim 1, wherein the longitudinal section of the base plate is a parabolic shape extending from a junction with the bridge pier to a bottom end of the beam-end closure plate.

3. The light-weight wide-width steel-UHPC combined cover beam as recited in claim 1, wherein a PBL key plate and a PBL key steel bar are arranged in the first UHPC pouring section, and a steel baffle plate is arranged at the tail end of the first UHPC pouring section positioned in the middle of the bottom plate.

4. The light-weight wide-width steel-UHPC composite capping beam of claim 1, wherein the diaphragm is rectangular and has a reinforced manhole in the center, and reinforcing ribs are provided on the facing surfaces of the top plate and the bottom plate, on the facing surfaces of the two transverse rims of the diaphragm, and on the facing surfaces of the two vertical rims of the diaphragm.

5. The light-weight broad-width steel-UHPC composite bent cap according to claim 1, wherein the top surface of the top plate is provided with a plurality of spaced apart seat cushion plates, and the lower end surfaces of the seat cushion plates are provided with reinforcing ribs.

6. The light-weight broad-width steel-UHPC composite capping beam of claim 1, wherein the transversal direction bulkheads comprise a set of outer transversal direction bulkheads and a set of inner transversal direction bulkheads, and the longitudinal direction bulkheads comprise a set of outer longitudinal direction bulkheads and a set of inner longitudinal direction bulkheads, both ends of the inner longitudinal direction bulkheads are welded to the outer transversal direction bulkheads, and both ends of the inner transversal direction bulkheads are welded to the inner longitudinal direction bulkheads.

7. The light gauge steel-UHPC composite capping beam of claim 6, wherein shear pins are provided on the facing surfaces of said outer and inner longitudinal bridging partitions, on the facing surfaces of said outer and inner transverse bridging partitions, and on the facing surfaces of both of said outer and inner transverse bridging partitions.

8. The light-weight broad-width steel-UHPC combined cover beam as claimed in claim 1, wherein the compressive strength of the UHPC materials poured by the first UHPC pouring section, the second UHPC pouring section and the third UHPC pouring section is more than or equal to 120MPa, and the elastic modulus is more than or equal to 40GPa.

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