CN113565024A

CN113565024A - Assembled UHPC composite trough plate culvert structure

Info

Publication number: CN113565024A
Application number: CN202110996860.5A
Authority: CN
Inventors: 段晓伟; 胡晓斌; 艾杰; 白龙
Original assignee: Gansu Jiaoshezhiyuan Industrial Co ltd
Current assignee: Gansu Jiaoshezhiyuan Industrial Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2021-10-29

Abstract

An assembled UHPC composite trough plate culvert structure, comprising: the foundation comprises a foundation cushion layer and a cast-in-place foundation, wherein a waterproof layer is preset on the bottom surface of the cast-in-place foundation, a UHPC (ultra high performance concrete) surface is arranged on the top surface of the foundation, culvert platforms are poured on two sides of the cast-in-place foundation, and the top ends of the culvert platforms are simply supported and connected with a cover plate; the cover plate and the culvert platform form spliced culvert sections which are connected into a whole through a cast-in-place foundation, a butterfly rubber waterstop is arranged between the culvert sections, and asphalt felt is wrapped outside the waterstop. The structure has reasonable design, simple construction and lower cost, adopts factory prefabrication and field assembly, can effectively ensure the construction quality and shorten the construction period.

Description

Assembled UHPC composite trough plate culvert structure

Technical Field

The invention relates to the technical field of culvert construction, in particular to an assembled UHPC composite trough plate culvert structure.

Background

In the highway bridge and culvert structure, the culvert has the characteristics of large quantity and wide distribution, and is a small structure with the functions of drainage, channels and the like. The construction progress and the construction quality of the whole highway are related to the construction period and the quality of the whole highway.

At present, culverts newly built, reconstructed and lengthened on roads are constructed in a cast-in-place mode, construction points are scattered, construction conditions are not uniform, a structure construction process is not easy to control, and the structure quality is difficult to guarantee in the cast-in-place and maintenance processes; in addition, the field construction is influenced by weather, terrain, concrete age, material transportation and the like, and the construction progress is slow. Therefore, the structure can be guaranteed in quality by adopting standardized design, factory prefabrication and field assembly technologies, the construction progress is promoted, and the environmental pollution is reduced.

Based on the current situation, some prefabricated cover plate culverts appear in China. The culvert is designed based on a cast-in-place cover plate culvert, the sizes of the cover plate and the culvert platform are completely different, the standardization degree is low, and the field construction process is actually simply carried into a factory. In addition, the cross section of the steel pipe is large in size, the structure has high dead weight, and field assembly is not facilitated; the material consumption is large, so the manufacturing cost is higher than that of a cast-in-place slab culvert.

The cover plate and the culvert platform of the traditional cover plate culvert are both rectangular sections, and the ultimate bearing capacity of the concrete flexural member is determined by the beam height, so that the section size of each linear meter under the given filling height is basically fixed, and the material consumption is hardly greatly reduced under the condition of the rectangular sections. But when the structure is stressed, except the top and bottom tension areas and the compression areas of the cross sections, the other cross sections are slightly stressed, and the utilization efficiency of the material is low. The redundant materials increase the self weight of the structure and improve the construction cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the fabricated UHPC composite trough plate culvert structure which has the advantages of reasonable structural design, simple and convenient construction and lower manufacturing cost, and can effectively ensure the construction quality and shorten the construction period by adopting factory prefabrication and field assembly.

In order to achieve the purpose of the invention, the invention adopts the technical scheme that:

an assembled UHPC composite trough plate culvert structure, comprising: the foundation comprises a foundation cushion layer and a cast-in-place foundation, wherein a waterproof layer and a foundation UHPC (ultra high performance concrete) plastering surface are preset on the bottom surface of the cast-in-place foundation, culvert platforms are poured on two sides of the cast-in-place foundation, and the top ends of the culvert platforms are simply supported and connected with a cover plate;

the cover plate and the culvert platform form spliced culvert sections which are connected into a whole through a cast-in-place foundation, a butterfly rubber waterstop is arranged between the culvert sections, and asphalt felt is wrapped outside the waterstop.

Preferably, the cast-in-place foundation is connected with the culvert platform through embedded steel bars.

Preferably, the culvert platform and the cover plate are connected through the shear pin and the mortise-tenon joint mechanism, and a foundation cushion layer is arranged at the bottom end of the culvert platform.

Preferably, the culvert is formed by the cover plate, the culvert platform, the mortise-tenon joint mechanism and the cast-in-place foundation.

Preferably, the cover plate and the culvert platform both adopt UHPC composite trough-shaped plates, the middle parts of the cover plate and the culvert platform are provided with culvert joint seams, each UHPC composite trough-shaped plate is composed of an UHPC material and a filling material playing a temporary protection role, the two sides of the filling material are respectively coated with an interface agent, each UHPC composite trough-shaped plate is divided into a bottom plate and a main rib, and the bottom plate faces downwards and the main ribs face upwards in use.

Preferably, the mortise and tenon joint mechanism comprises: the end of the cover plate and the top of the culvert platform are provided with grooves and are mutually nested, so that vertical and horizontal boundary constraints are provided for the cover plate and the culvert platform, and horizontal boundary constraints are provided for the top of the culvert platform; and a shear pin is arranged on the culvert platform and inserted into the preformed hole of the cover plate to serve as a boundary condition for reinforcing the cover plate in the horizontal direction.

Preferably, the lower parts of the joints between the cover plates and the culvert platforms are filled with mortar, and the upper parts of the joints are filled with asphalt floc.

The invention has the beneficial effects that:

1. the engineering prefabrication and the construction quality are easy to guarantee. The main stressed component cover plate and the culvert platform are prefabricated in an industrial mode, and the overall quality of the structure is easy to guarantee.

2. The structure design is reasonable, and the material utilization efficiency is high. Analysis shows that the rest parts of the rectangular cross section of the traditional culvert structure except the top and bottom tension area and the compression area participate in small stress. The proposed composite UHPC trough-shaped plate structure completely removes the part with smaller stress in the rectangular cross section of the cover plate and the culvert platform of the traditional culvert, greatly reduces the use amount of main materials of the cross section area to 1/10 of the traditional culvert, increases the cross section stress, and obviously improves the material utilization efficiency. Because the section size is smaller, light materials such as foam concrete and the like are filled between the grooves and are used as protection in the structure assembling process.

3. The material consumption is saved and the manufacturing cost is lower. The cover plate and the culvert platform of the invention dig out the part with smaller stress of the rectangular section of the common culvert, and the material consumption is greatly smaller.

4. After the sizes of the cover plate and the culvert platform are reduced, the section stress is increased, and the traditional concrete can not meet the strength requirement, so that the UHPC with ultrahigh strength is required. The material has the characteristic of corrosion resistance, and is matched with a basic waterproof layer and a plastering layer, so that the structure can be used under severe environmental conditions such as strong freeze thawing, strong corrosion and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of a structural culvert of the present invention;

FIG. 2 is a top view of the structural foundation of the present invention;

FIG. 3 is a schematic view of the inventive culvert foundation connecting steel bar;

FIG. 4 is a vertical plane layout of culvert of the invention, the culvert low longitudinal slope adopts a step form;

FIG. 5 is a cross-sectional view of a UHPC composite trough plate of the present invention;

FIG. 6 is a schematic view of a tenon-and-mortise connection mechanism of a cover plate and a culvert platform according to the present invention;

FIG. 7 is a schematic view of the production of a UHPC composite trough plate floor of the present invention;

reference symbol comparison table:

1-cover plate, 2-culvert platform, 2.1-culvert section, 3-cast-in-place foundation, 4-foundation UHPC plastering, 5-waterproof layer, 6-embedded steel bar, 7-shear pin, 8-mortise and tenon joint mechanism, 9-main rib, 10-bottom plate, 11-filling material, 12-UHPC material, 13-interface agent, 14-culvert section joint and 15-foundation cushion layer.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

As shown in fig. 1 to 7, an assembled UHPC composite trough plate culvert structure, comprising: the foundation comprises a foundation cushion layer 15 and a cast-in-place foundation 3, wherein a waterproof layer 5 and a foundation UHPC (ultra high performance concrete) plastering surface 4 are preset on the bottom surface of the cast-in-place foundation 3, culvert platforms 2 are poured on two sides of the cast-in-place foundation 3, and the top ends of the culvert platforms 2 are simply supported and connected with a cover plate 1;

the cover plate 1 and the culvert platform 2 form an assembled culvert section 2.1 which is connected into a whole through a cast-in-place foundation 3, a butterfly rubber waterstop is arranged between culvert sections, and asphalt felt is wrapped outside the waterstop.

The cast-in-place foundation 3 is connected with the culvert platform 2 through embedded steel bars 6.

Culvert platform 2 and apron 1 are through shear pin 7 and mortise-tenon joint mechanism 8 connection apron 1, culvert platform 2 bottom is equipped with foundation bed course 15.

The culvert is formed by the cover plate 1, the culvert platform 2, the mortise-tenon joint mechanism 8 and the cast-in-place foundation 3.

The cover plate 1 and the culvert platform 2 are both made of UHPC composite groove-shaped plates, culvert joint seams 14 are arranged in the middle of the cover plate and the culvert platform, each UHPC composite groove-shaped plate is composed of an UHPC material 12 and a filling material 11 playing a temporary protection role, the two sides of each filling material 11 are coated with an interface agent 13, each UHPC composite groove-shaped plate is divided into a bottom plate 10 and a main rib 9, and the bottom plate 10 faces downwards and the main ribs 9 face upwards in use.

Mortise and tenon joint mechanism 8 includes: the end of the cover plate 1 and the top of the culvert platform 2 are provided with grooves and are mutually nested, so that vertical and horizontal boundary constraints are provided for the cover plate 1 and the culvert platform 2, and horizontal boundary constraints are provided for the top of the culvert platform; the culvert platform 2 is provided with a shear pin 7 which is inserted into the cover plate preformed hole and used as a boundary condition for reinforcing the cover plate in the horizontal direction.

The lower parts of the joints between the cover plates and the culvert platform are filled with mortar, and the upper parts of the joints are filled with asphalt floc.

1. Prefabrication in a factory:

the cover plate and the culvert platform are both plate structures, are prefabricated by adopting a long-line platform method, and are cut into plates with required span after maintenance is finished. The prefabrication process is as follows: template assembly → application of a release agent → steel bar binding → longitudinal prestressed steel bar tensioning → concrete pouring → vibration of a vibration table → steam curing → longitudinal prestressed steel bar tensioning → plate cutting → template removal, marking → hoisting to a storage area → delivery.

Specifically, binding arch rib steel bars on a template, positioning and tensioning longitudinal prestressed steel bars, pouring concrete, releasing the tension after the strength of the concrete reaches 70%, and demolding and maintaining. And simultaneously, performing field implementation of the prefabricated foundation.

Specifically, the span of the culvert is 1, 23 and 4m, the thickness of the filled soil is 0.5 to 3m, and the thickness of the culvert plate is 5 cm.

2. Assembling on site:

and (4) after the cover plate 1 and the culvert platform 2 are conveyed to the site, assembling the cover plate and the culvert platform on the site.

(1) Culvert platform, apron installation: will contain platform 2 hoist to the water stabilization bed course of accomplishing in advance (contain platform bottom cross-section and embedded bar provide interim support jointly), installation apron 1, the structure passes through mortise-tenon joint mechanism 8 and forms interim balanced system.

(2) Foundation cast-in-place: binding foundation steel bars on the embedded steel bars 6 of the culvert platform, pouring concrete and plastering, and then entering foundation concrete maintenance. And (5) assembling the next section while maintaining, and so on.

(3) Seam treatment: and after all the culverts are assembled and all the foundations are poured and maintained, performing seam treatment. Asphalt batting is filled in the joint of the cover plate and the culvert platform, the asphalt batting is filled between culvert sections at first, and then two asphalt felts are wrapped outside, so that the culvert sections are ensured not to leak water.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An assembled UHPC composite trough plate culvert structure, comprising: the foundation comprises a foundation cushion layer (15) and a cast-in-place foundation (3), wherein a waterproof layer (5) is preset on the bottom surface of the cast-in-place foundation (3), a foundation UHPC (ultra high performance concrete) plastering layer (4) is arranged on the top surface of the cast-in-place foundation (3), culvert platforms (2) are poured on two sides of the cast-in-place foundation (3), and the top ends of the culvert platforms (2) are simply supported and connected with a cover plate (1);

the cover plate (1) and the culvert platform (2) form assembled culvert sections (2.1) which are connected into a whole through a cast-in-place foundation (3), butterfly rubber waterstops are arranged between the culvert sections, and asphalt felt is wrapped outside the waterstops.

2. The fabricated UHPC composite trough plate culvert structure of claim 1, wherein: the cast-in-place foundation (3) is connected with the culvert platform (2) through embedded steel bars (6).

3. The fabricated UHPC composite trough plate culvert structure of claim 1, wherein: culvert platform (2) and apron (1) are through shear force round pin (7) and mortise-tenon joint mechanism (8) connection apron (1), culvert platform (2) bottom is equipped with basic bed course (15).

4. An assembled UHPC composite trough plate culvert structure according to claim 3, wherein: the culvert is formed by the cover plate (1), the culvert platform (2), the mortise and tenon connecting mechanism (8) and the cast-in-place foundation (3).

5. The fabricated UHPC composite trough plate culvert structure of claim 1, wherein: the cover plate (1) and the culvert platform (2) are both made of UHPC composite groove-shaped plates, culvert joint seams (14) are arranged in the middle of the cover plate, each UHPC composite groove-shaped plate is composed of an UHPC material (12) and a filling material (11) playing a temporary protection role, an interface agent (13) is smeared on two sides of each filling material (11), each UHPC composite groove-shaped plate is divided into a bottom plate (10) and a main rib (9), and the bottom plate (10) faces downwards and the main rib (9) faces upwards during use.

6. An assembled UHPC composite trough plate culvert structure according to claim 3, wherein: mortise-tenon joint mechanism (8) includes: grooves are formed in the end of the cover plate (1) and the top of the culvert platform (2), and the cover plate (1) and the culvert platform (2) are nested with each other, so that vertical and horizontal boundary constraints are provided for the cover plate (1) and the culvert platform (2), and horizontal boundary constraints are provided for the top of the culvert platform; a shear pin (7) is arranged on the culvert platform (2) and inserted into the cover plate preformed hole to serve as a boundary condition for reinforcing the cover plate in the horizontal direction.

7. The fabricated UHPC composite trough plate culvert structure of claim 1, wherein: the lower parts of the joints between the cover plates and the culvert platform are filled with mortar, and the upper parts of the joints are filled with asphalt floc.