CN217499906U

CN217499906U - Ultra-high performance concrete segmental beam mixed and bundled in vivo and in vitro

Info

Publication number: CN217499906U
Application number: CN202221257820.5U
Authority: CN
Inventors: 李雪峰; 陆元春; 周良; 董夏鑫; 丁佳元; 钟小军; 蔡亮
Original assignee: Shanghai Urban Construction Design Research Institute Group Co Ltd
Current assignee: Shanghai Urban Construction Design Research Institute Group Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-09-27
Anticipated expiration: 2032-05-24

Abstract

The utility model discloses an ultra-high performance concrete segment beam mixed in vivo and in vitro, which comprises more than one main beam segment with the length not exceeding 30 meters; the plurality of main beam segments are connected end to form a beam and are connected by adopting an external beam; in the more than three main beam sections, except for two main beam sections at two ends, other main beam sections are all universal sections; each universal segment is provided with a pretensioned in-vivo bundle and is manufactured in a factory; two ends of each universal segment are provided with a middle partition plate and a shear key. During construction, all universal sections and two main beam sections positioned at two ends of a beam are manufactured in a factory and transported to a construction site after the construction is finished; and then tensioning the extracorporeal bundles on site for assembly. The utility model discloses an use and be able to solve the uncompacted problem of post-tensioned method precast beam pipeline grout, reduced arranging of prestressing force pipeline, reduced the size of component, realize the light-duty of girder of striding greatly, adopted the pattern of long section, the construction of being more convenient for.

Description

Ultra-high performance concrete segmental beam mixed and bundled in vivo and in vitro

Technical Field

The utility model relates to the technical field, in particular to internal and external ultra high performance concrete segment roof beam of joining in marriage bundle that mixes.

Background

The ultra-high performance concrete is a new variety of cement-based structural engineering material with clear performance indexes. Compared with common concrete, the ultra-high performance concrete has the characteristics of ultra-high strength, ultra-high toughness, ultra-high durability and the like. The ultra-high performance concrete is applied to structural engineering, so that the structure can be lightened, and the service life of the structure can be prolonged.

Compared with common concrete, the compressive strength of the ultra-high performance concrete is greatly improved, and the tensile strength is improved, but the tensile strength is obviously improved, which is not as good as the compressive capacity of the ultra-high performance concrete. Therefore, in the design of the main beam, the ideal design is combined with prestress, and the ultrahigh pressure resistance of the ultrahigh-performance concrete is fully utilized by tensioning the prestressed steel beams, so that the ultrahigh-performance concrete has larger pre-pressure reserved for resisting the load, and meanwhile, the crack resistance of the ultrahigh-performance concrete in the limit state of normal use is greatly improved.

For a prestressed system, a prestressed tendon duct needs to be reserved for post-tensioning prestressing, and grouting is carried out after tensioning is finished. The ultra-high performance concrete is adopted in the structure, the structure is expected to be light, the wall thickness of the structure is reduced, the reduction of the wall thickness is limited by the size requirement of a post-tensioned prestressed duct, and meanwhile, the strength matching property of the grouting material and the main UHPC material is required to be further researched. Meanwhile, the post-tensioning method also has the problem of incompact grouting, so that a pre-tensioning method in-vivo prestressed system or an in-vitro prestressed system is an ideal choice for the UHPC main body beam.

Compared with an external prestressed system, the efficiency of the internal prestressed system is better. When the span of the main beam is small (below 30m), a pretensioning method in-vivo prestress system can be adopted; when the span of the main beam is large (larger than 30m), the main beam needs to be segmented for transportation and other reasons, and the pretensioning method internal prestress system is not suitable. Therefore, the utility model provides a pretensioning method is internal to be joined in marriage super high performance concrete segment girder construction of restrainting with external mixture.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of prior art, the utility model provides an internal and external mix ultra high performance concrete segment roof beam of joining in marriage a bunch, internal bundle has adopted the pretension method technology, and the purpose of realization makes the structure can avoid the problem that the pretension method steel tie brought, and the characteristic of the better utilization ultra high performance concrete reaches the light-dutyization of structure simultaneously.

In order to achieve the purpose, the utility model discloses an ultra-high performance concrete segment beam mixed and bundled in vivo and in vitro; including more than one main beam segment of no more than 30 meters in length.

The plurality of main beam segments are connected end to form a beam and are connected by adopting an external beam;

among the three or more main beam segments, the other main beam segments are common segments except for two main beam segments at both ends;

each universal section is provided with a pretensioned in-vivo bundle and is manufactured in a factory or is independently used as a beam with the length of 20-30 meters;

and the end part of the two ends of each universal section, which is connected with the other main beam section, is provided with a middle partition plate and a shear key.

Preferably, each of the main beam sections is box-shaped, channel-shaped or i-shaped in cross-section.

Preferably, the span of the beam formed by the three main beam sections is 30-90 m; the span of a beam formed by the four main beam sections is 90-120 m; the span of the beam formed by the five main beam sections is 120-150 meters.

Preferably, each of the universal segments has a length of 20 to 30 meters.

Preferably, a shearing member is arranged between every two adjacent main beam sections.

The utility model has the advantages that:

the utility model discloses an use and be able to solve the uncompacted problem of post-tensioned method precast beam pipeline grout, reduced arranging of prestressing force pipeline, greatly reduced the size of component, realized the light-duty of girder of striding greatly, adopted long segmental pattern in addition, reduced the segmentation quantity of bridge of striding greatly, it is more convenient to be under construction.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 shows a schematic side view of a main beam segment according to an embodiment of the present invention.

Fig. 2 shows a schematic cross-sectional structure diagram of a main beam segment according to an embodiment of the present invention.

Fig. 3 is a schematic side view of a structure of a multi-section main beam segment sequentially connected and provided with an external beam according to an embodiment of the present invention.

Fig. 4 shows a schematic cross-sectional structure of a main beam segment with an external bundle in an embodiment of the present invention.

Fig. 5 shows a schematic view of a state that the main beam segment is arranged at the upper end of the temporary support in an embodiment of the present invention.

Detailed Description

Examples

As shown in fig. 1 to 4, ultra-high performance concrete segmental beams bundled in vivo and in vitro; including more than one main beam segment of no more than 30 meters in length.

Wherein, a plurality of main beam segments are connected end to form a beam and are connected by adopting an external beam 2;

in the more than three main beam sections, except for two main beam sections at two ends, other main beam sections are all universal sections;

each universal segment is provided with a pretensioned in-vivo bundle 1 and is manufactured in a factory or is independently used as a beam with the length of 20-30 meters;

the end part of the two ends of each universal section connected with the other main beam section is provided with a middle partition plate and a shear key.

The utility model solves the problem of incompact grouting of the post-tensioning precast beam pipeline by the mixed matching of the pre-tensioning in-vivo beam 1 and the in-vitro beam 2;

the middle partition plate can be used as a steering device of the external beam to realize steering of the external beam, and the shear keys of the segmental beams can be arranged at the middle partition plate to realize shear connection of the segmental beams, so that the problem that the shear keys cannot be effectively arranged because the wall thickness of the ultrahigh-performance concrete beam is thin is solved;

moreover, the arrangement of prestressed pipelines is reduced by the pretensioning method, the size of the member is greatly reduced, the characteristics of the ultra-high performance concrete are exerted, and the lightening of the main girder with the large span is realized; in addition, a long section mode is adopted, the number of sections of the large-span bridge is reduced, and the construction is convenient.

In some embodiments, each main beam section is box-shaped, channel-shaped, or i-shaped in cross-section.

In certain embodiments, the span of a beam of three main beam segments is 30 to 90 meters; the span of a beam formed by the four main beam sections is 90-120 meters; the span of a beam consisting of five main beam segments is 120 to 150 meters.

In certain embodiments, each universal segment is 20 meters to 30 meters in length.

In certain embodiments, a shear member is disposed between each two adjacent main beam segments.

The utility model discloses still provide the internal and external mixed construction method who joins in marriage super high performance concrete segment roof beam of restrainting of body, including following step:

step 1, manufacturing all universal segments;

step 2, manufacturing two main beam sections positioned at two ends of the beam;

step 3, transporting all the universal sections and the two main beam sections positioned at the two ends of the beam to a construction site;

step 4, assembling all the general sections and two main beam sections positioned at two ends of the beam on the ground of a construction site if the hoisting capacity allows, tensioning the external beam 2 and anchoring, and hoisting to a bridge position after assembling is completed;

as shown in fig. 5, if the weight of the assembled beam body exceeds the hoisting capacity, temporary supports 3 are arranged, all the general sections and two main beam sections at two ends of the beam are respectively hoisted to the bridge position, and then the tensioning body outer bundle 2 is assembled.

In some embodiments, step 1, the manufacturing of each universal segment comprises the following steps:

step 1.1, installing a template on a pre-tensioning method pedestal, and tensioning a corresponding pre-tensioning method in-vivo bundle 1;

step 1.2, pouring ultra-high performance concrete, and reserving corresponding shear keys at positions corresponding to the end parts of all the universal sections;

step 1.3, shearing the prestressed tendons when the strength of the ultrahigh-performance concrete reaches the design strength;

and 1.4, removing each universal segment from the bench for maintenance.

In certain embodiments, in step 2, fabricating each main beam segment at both ends of the beam comprises the steps of:

step 2.1, installing a template, and pouring ultra-high performance concrete;

and 2.2, removing the template when the strength of the ultrahigh-performance concrete reaches the designed strength, and curing to the age according to the regulations.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The ultra-high performance concrete segmental beam mixed and bundled in vivo and in vitro is characterized by comprising more than one main beam segment with the length not more than 30 meters;

the plurality of main beam sections are connected end to form a beam and are connected by adopting an external beam (2);

each universal segment is provided with a pretensioned in-vivo bundle (1) and is manufactured in a factory or is independently used as a beam with the length of 20-30 meters;

2. The ultra-high performance concrete segmented beam in combination and bundled in vitro and in vivo as claimed in claim 1, wherein each of the main beam segments has a box-shaped, channel-shaped or I-shaped cross section.

3. The ultra-high performance concrete segmented beam in vivo and in vitro mixed bundle matching according to claim 1, wherein the span of the beam consisting of the three main beam segments is 30-90 m; the span of a beam formed by the four main beam sections is 90-120 m; the span of the beam formed by the five main beam sections is 120-150 meters.

4. The ultra-high performance concrete segmented beam in combination and bundled in vitro and in vivo as claimed in claim 1, wherein the length of each universal segment is 20 m to 30 m.

5. The ultra-high performance concrete segmented beam in vivo and in vitro mixed bundle preparation according to claim 1, wherein a shearing force member is arranged between every two adjacent main beam segments.