CN211036665U

CN211036665U - Half-opening fully-prefabricated UHPC cover beam

Info

Publication number: CN211036665U
Application number: CN201921453289.7U
Authority: CN
Inventors: 李立峰; 尹会娜; 胡方键; 陈卫伟; 廖瑞; 程子涵; 陈明玉; 邵旭东; 张晓松; 黄生富
Original assignee: Hunan University; Shanghai Urban Construction Design Research Institute Group Co Ltd
Current assignee: Hunan University; Shanghai Urban Construction Design Research Institute Group Co Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-07-17
Anticipated expiration: 2029-09-03

Abstract

The utility model discloses a full prefabricated UHPC bent cap of half opening, roof and two webs including the level setting, the web is vertical to be set up in roof bottom both sides and extend to another tip from a tip of roof, the full prefabricated UHPC bent cap of half opening still includes vertical a plurality of bottom plates, baffle, the end plate that sets up in the roof bottom, the end plate is close to roof both ends setting, the bottom plate is located the baffle below and is close to the roof middle part setting and supports in the pier top, the baffle sets up along the length direction interval of roof, baffle and end plate set up between two webs, the utility model has the advantages of the dead weight is low, the durability is good, little to the construction site influence.

Description

Half-opening fully-prefabricated UHPC cover beam

Technical Field

The utility model relates to a design and construction field that the bridge was prefabricated to be assembled especially relate to a half-opening is prefabricated UHPC bent cap entirely.

Background

The capping beam is a stressed part in the bridge structure, plays an important role in connecting the upper structure and the lower structure, bears the constant load of the upper structure and the live load effect transferred by the main beam to the capping beam, and transfers the loads to the bridge pier and the foundation. In order to take the surrounding environment and the construction speed of the bridge into consideration, the design of the capping beam with large internal hollowing rate is a good construction scheme. Ordinary concrete cap beam is easy to crack, has poor durability, and is difficult to realize larger internal void ratio.

The bent cap is usually realized by adopting a construction method of pouring concrete in situ or prefabricating in sections, but the cast-in-situ construction is long, the occupied time of the space under the bent cap is long, and the negative influence on the surrounding environment is large; the sectional prefabrication workload is small, the construction period is short, the field environment influence is small, but a bracket is still required to be arranged to support the sectional capping beam during sectional prefabrication and assembly, and the field is still negatively influenced.

In the prior art, an integral precast bent cap construction method is adopted, wherein the whole bent cap is precast outside a field, and then is transported to the field and is directly hoisted. The construction method solves the problem that the occupied area of the support in the cast-in-place process affects traffic, is short in construction period and small in field environment, but along with the increasing of the specification of the bent cap, the tonnage of the whole bent cap can reach 200-400 tons, mature transportation is inconvenient, field installation is difficult, and the assembly application of the bridge bent cap is limited.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a dead weight low, the durability good, to the little half-opening full-prefabricated UHPC bent cap of job site influence.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a full prefabricated UHPC bent cap of half opening, includes roof and two webs that the level set up, the web is vertical to be set up in roof bottom both sides and extends to another tip from a tip of roof, the full prefabricated UHPC bent cap of half opening still includes vertically to set up in a plurality of bottom plates, baffle, the end plate of roof bottom, the end plate is close to roof both ends setting, the bottom plate is located the baffle below and is close to the roof middle part setting and supports in the pier top, the baffle sets up along the length direction interval of roof, baffle and end plate set up between two webs.

As a further improvement to the above technical solution:

the thickness of the partition above the bottom plate is larger than that of other partitions.

The baffle and the end plate are perpendicular to the two webs.

Prestressed steel bars are arranged in the top plate and the web plate.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a full prefabricated UHPC bent cap of half opening, bent cap adopt the UHPC bent cap, have overcome ordinary concrete bent cap easy cracking, the poor problem of durability, improve the life of bridge, simultaneously, because the better tension performance of UHPC compares with ordinary prestressed concrete bent cap, the concrete and the steel strand wires material quantity of UHPC bent cap all reduce by a wide margin, improve the economic benefits of bridge, the cost is reduced.

The half-opening fully-prefabricated UHPC bent cap of the utility model adopts the UHPC bent cap, fully utilizes the ultrahigh strength and excellent durability of the UHPC bent cap, adopts the half-opening section form with large internal hollowing rate, compared with the traditional concrete bent cap, the utility model reduces the dead weight by more than 50 percent, greatly facilitates the urban transportation and the field installation, has the advantages of simple structure, convenient assembly and the like, can better meet the requirement of lightening the prefabricated assembly component of the bridge, the cross section is in a half-open cross section form, the torsional rigidity of the cross section is between the open cross section and the closed cross section, the member is light and can meet the functional requirements of the member, and compared with the open cross section, the partition plate can effectively improve the torsional rigidity of the cover beam structure and reduce distortion stress, so that the cover beam structure is not only suitable for connecting piers and continuous piers, but also suitable for fixing buttresses and meets the stress requirements of bending resistance, shearing resistance and torsion resistance of the cover beam.

The utility model discloses a half-opening is prefabricated UHPC bent cap simple structure entirely, the dead weight is lighter, the construction is simple and convenient, the durability is good, and maintains fewly, long service life, intensity is high, toughness is big, and tensile strength is high, and cost performance is high, and is applicable in big cantilever bent cap design and construction, has very good popularization and application prospect in big cantilever bent cap design and construction, especially under the condition that receives weight, traffic influence to be big, and it is more clear to use the competitive edge.

The utility model discloses a half-opening is prefabricated UHPC bent cap entirely, inside excavation rate is big, and the dead weight is light, can once accomplish the prefabrication and assemble. The construction process overcomes the defects of the existing cast-in-place bent cap construction process, the integral prefabricated bent cap construction process and the sectional prefabricated assembled bent cap construction process, and solves the technical problems of the cast-in-place bent cap construction process in the aspects of construction quality, speed, environmental influence and the like; the technical problems of transportation, hoisting and assembly of the integral capping beam or the segmented prefabricated and assembled capping beam are also solved.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a bottom view of the present invention.

Fig. 3 is a plan view of the present invention.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a sectional view taken along line B-B of fig. 4.

Fig. 6 is a cross-sectional view taken along line C-C of fig. 4.

Fig. 7 is a cross-sectional view taken along line D-D of fig. 4.

The reference numerals in the figures denote:

1. a partition plate; 2. a base plate; 3. a bridge pier; 4. a top plate; 5. a web; 6. and an end plate.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples.

As shown in fig. 1 to 7, the fully-prefabricated UHPC bent cap of half opening of this embodiment, including roof 4 and two webs 5 that the level set up, web 5 vertically sets up in roof 4 bottom both sides and extends to another tip from one end of roof 4, the fully-prefabricated UHPC bent cap of half opening still includes vertically sets up in a plurality of bottom plates 2 of roof 4 bottom, baffle 1, end plate 6 is close to roof 4 both ends and sets up, bottom plate 2 is located baffle 1 below and is close to roof 4 middle part setting and support in pier 3 top, baffle 1 sets up along the length direction interval of roof, baffle 1 and end plate 6 set up between two webs 5.

The utility model discloses a full prefabricated UHPC bent cap of half opening adopts the UHPC bent cap, has overcome ordinary concrete bent cap easy cracking, the poor problem of durability, improves the life of bridge, simultaneously, because the better tension performance of UHPC compares with ordinary prestressed concrete bent cap, the concrete and the steel strand wires material quantity of UHPC bent cap all reduce by a wide margin, improve the economic benefits of bridge, the cost is reduced. The bent cap adopts the UHPC bent cap, make full use of UHPC superhigh strength, excellent durability, adopt the half open-ended cross-sectional form that the inside void fraction is big, compare with traditional concrete bent cap, the utility model discloses alleviate more than dead weight 50%, greatly made things convenient for urban transportation, on-the-spot installation, have simple structure, assemble beneficial effect such as facility, can better satisfy the light-duty requirement of bridge prefabrication assembly component, and the cross-section adopts half open-ended cross-sectional form, cross-section torsional rigidity is between opening cross-section and closed cross-section, also can satisfy component function demand when the component is light-duty, for the opening cross-section, baffle 1 can effectively improve the torsional rigidity of bent cap structure, reduce distortion stress, not only be applicable to handing-over mound, continuous mound, still be applicable to solid buttress.

In this embodiment, the bottom plate 2 and the end plate 6 are both two.

The thickness of the partition board 1 above the bottom board 2 is larger than that of the other partition boards 1. The partition plates 1 arranged at the piers 3 transmit upper structure load, and the partition plates 1 at other positions improve the torsional rigidity of the structure, so that the partition plates 1 arranged at the piers 3 need to be thickened, and the thicker the partition plates are, the better the partition plates are.

The partition board 1 and the end board 6 are perpendicular to the two webs 5, and the end board 6 is parallel to the partition board 1.

Prestressed steel bars are arranged in the top plate 4 and the web plate 5. In this embodiment, the bent cap structure reinforcing steel adopts the form of pre-stressed steel bundle and ordinary reinforcing steel bar mixed reinforcing steel, and the structure reinforcing steel adopts the form of pre-stressed steel bundle and ordinary reinforcing steel bar mixed reinforcing steel. Compared with common concrete, the UHPC has small water cement ratio and large fluidity, is easy to fill the template, and simultaneously, because the section adopts a half-opening section form, compared with a closed section, the buoyancy action area borne by the reinforcement cage and the template is smaller, so that the anti-floating measure is not needed. When the UHPC bent cap is poured, the steel template is adopted, so that the UHPC bent cap can be recycled and is convenient to demould. In addition, the structure is provided with fewer prestressed tendons, and the tensioning can be completed in a factory at one time.

The utility model relates to a construction process of half opening full prefabrication UHPC bent cap, including following step:

step one, integrally pouring a UHPC cover beam on a prefabricated site, and applying prestress.

And step two, transporting the integral UHPC capping beam obtained in the step one to a construction site.

And step three, hoisting the UHPC capping beam on the pier on the construction site by adopting hoisting equipment.

The utility model discloses a half-opening fully-prefabricated UHPC bent cap, construction period is short, little, the good quality reliability advantage of environmental impact. Additionally, the utility model discloses light in weight can adopt conventional mechanical equipment to construct, and the equipment requirement is low, is convenient for transport, assembles. More importantly, no additional support is required to be arranged on the construction site, the workload is reduced, and the negative influence on the construction environment is reduced to the minimum.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a full prefabricated UHPC bent cap of half opening, includes roof (4) and two webs (5) that the level set up, web (5) are vertical to be set up in roof (4) bottom both sides and extend to another tip from one end of roof (4), its characterized in that: half-opening fully-prefabricated UHPC bent cap still includes vertically set up in a plurality of bottom plates (2), baffle (1), end plate (6) of roof (4) bottom, end plate (6) are close to roof (4) both ends and set up, bottom plate (2) are located baffle (1) below and are close to roof (4) middle part setting and support in pier (3) top, baffle (1) sets up along the length direction interval of roof (4), baffle (1) and end plate (6) set up between two webs (5).

2. The half-open fully-prefabricated UHPC capping beam of claim 1, wherein: the thickness of the partition board (1) above the bottom board (2) is larger than that of other partition boards (1).

3. The half-open fully prefabricated UHPC capping beam according to claim 1 or 2, wherein: the partition plate (1) and the end plate (6) are perpendicular to the two webs (5).

4. The half-open fully-prefabricated UHPC capping beam of claim 3, wherein: prestressed steel bars are arranged in the top plate (4) and the web plate (5).