CN115233541A - A connection structure of a segmented prefabricated and assembled cover beam and its construction method - Google Patents

Abstract

The invention relates to the field of bridge prefabrication and assembly, in particular to a connection structure of a segmented prefabricated assembled cover beam and a construction method thereof. When the cover beam is divided into two prefabricated pieces along the bridge direction and connected by wet joints, the wet joints are set at the top of the cover beam and at the end of the transverse bridge direction to connect the prefabricated cover beams as a whole and jointly bear the role of the load. . The steel bars reserved for the wet joints are arranged on the outer surface side of the main structure of the prefabricated cover beams, and the prefabricated cover beams do not need a large number of grooves, which is convenient for the prefabrication of the cover beams and the construction of the wet joints on site. If the wet joint is grooved, it will affect the prestressed steel bundles and reinforcement arrangement of the prefabricated cover beam along the length direction. At the same time, the grooved formwork and a large number of reserved reinforcement holes increase the complexity of the construction. . Based on the idea of avoiding arranging grooves along the length direction of the cover beam, the present invention sets the wet joint on the surface side of the main body of the prefabricated cover beam structure, and the reinforcement and prestressed arrangement of the prefabricated cover beam are not affected by the wet joint, thereby improving work efficiency and construction. Quality is easy to guarantee.

Description

A connection structure of a segmented prefabricated and assembled cover beam and its construction method

technical field

The invention relates to the field of bridge prefabrication and assembly, in particular to a connection structure of a segmented prefabricated assembled cover beam and a construction method thereof.

Background technique

The viaduct cover beam has the characteristics of concentrated force, large size and heavy weight. As a force-transmitting member between the upper and lower structures of a bridge, its structural dimensions are related to the width, span and position of the pier columns. For a conventional viaduct with a span of 30m, the two-way 6-lane cover beam weighs about 240 to 250t; urban viaducts and interchanges at ramp points, junctions, cross-junctions, etc., the span and bridge width are increased, and the cover beam weight exceeds 250t. A large number of viaduct cover beams need to be prefabricated and installed in sections or pieces.

The cover beam structure of the existing segmented prefabricated assembly construction method is divided from the segmental method, and there are two forms of segmenting the cover beam along the transverse bridge direction and along the bridge direction. Among them, the method of splitting the cover beam along the bridge direction does not require temporary brackets for on-site component installation, which has the advantages of convenient construction and low risk.

For the prefabricated cover beam, the connection structure is the key. There are few engineering cases implemented so far. There have been published patents, the wet joint connection structure adopts the method of opening grooves in prefabricated components and pouring wet joints in the grooves on site. This structure affects the prestressed steel bundles and reinforcement arrangements of the prefabricated cover beams along the length direction. At the same time, The formwork in the form of grooves and a large number of reserved reinforcement holes increase the complexity of the construction.

SUMMARY OF THE INVENTION

The present invention overcomes the problems existing in the prior art, and provides a connection structure for segmented prefabricated and assembled cover beams, so that the steel bars and prestressed arrangements of the cover beams are not affected by wet joints, and at the same time, the structure is reasonable and convenient for construction operations , improve work efficiency, and the construction quality is easy to guarantee.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a connection structure of a segmented prefabricated and assembled cover beam, and the technical scheme is as follows:

The utility model relates to a connection structure of segmented prefabricated and assembled cover beams. The cover beam is divided into two prefabricated pieces along the bridge direction, and the prefabricated cover beams are connected as a whole through wet joints arranged on the top of the cover beam and at the end of the transverse bridge. Jointly bear the role of the use load; the reserved steel bars for the wet joint are arranged on the outer surface side of the main structure of the prefabricated cover beam, and the prefabricated cover beam does not need a lot of grooves, which is convenient for the prefabrication of the cover beam and the construction of the wet joint on site.

In some embodiments disclosed in this solution, the reinforcement and prestressing arrangements of the prefabricated cap beams are not affected by the wet joints, maintaining the continuity and integrity of the prefabricated structure.

In some embodiments disclosed in this solution, the top wet seam can be arranged in combination with the support rock, making full use of the conventional structure space, and being economical.

In some embodiments disclosed in this solution, the wet joint material may be high-performance concrete or ultra-high-performance concrete.

In some embodiments disclosed in this solution, in general, only the form of a full-length wet seam at the top may be adopted, and the wet seam at the end of the transverse bridge may be provided as required.

In some embodiments disclosed in this solution, the transverse bridge has wet joints at the ends. In order to reduce the workload of on-site formwork, part of the outer surface can be prefabricated, and the internal wet joints can be poured later. This form can also avoid precast concrete and wet joints. The color difference between the joint concrete is exposed.

In addition, the present invention also provides a construction method for the connection structure of the segmented prefabricated and assembled cover beams, the specific steps of which are:

1. Prefabricated cover beams are constructed in the factory, and annular wet joint reinforcement bars are reserved at the top of the cover beams and at the ends of the transverse bridge direction;

2. The prefabricated beams are transported to the site, and the left and right prefabricated cover beams are independently hoisted and placed on the piers;

3. For the joints between prefabricated cover beams and pier columns, the joint technology can use grouting sleeve connection, grouting metal bellows connection or high-performance concrete as wet joint material, etc.;

4. Install wet-joint steel bars, pour wet-joint concrete, tension part of the prestress as needed, and complete the cover beam assembly construction.

The present invention has the following beneficial effects:

1. If the groove is used in wet joints, it will affect the arrangement of prestressed steel bundles and reinforcement along the length of the prefabricated cover beam. At the same time, the grooved formwork and a large number of reserved reinforcement holes increase the construction time. Complexity. Therefore, based on the idea of avoiding arranging grooves along the length direction of the cover beam, the present invention provides the wet seam on the surface side of the prefabricated cover beam structure body and protrudes from the cover beam surface.

2. The steel bars and prestressed arrangement of the prefabricated cover beam of the present invention are not affected by wet joints, and the continuity and integrity of the prefabricated cover beam concrete and steel bars are maintained.

3. From the perspective of coordinating the force and deformation of the two prefabricated cover beams, the connection effect of the wet seam at the top is better than the wet seam at the end of the transverse bridge, and the wet seam at the end can enhance the integrity. Therefore, in general, only the form of wet seam with a full length at the top can be used, and the wet seam at the end can be provided or not provided as required.

4. The top wet seam can be arranged in combination with the support and cushion stones, making full use of the conventional structural space and being economical.

5. When the top wet joint is used, the wet joint is located at the bottom of the upper structural beam after the bridge is completed, and the color difference between the wet joint concrete and the precast concrete will not affect the landscape effect.

6. Wet joint materials can be made of high-performance concrete or ultra-high-performance concrete, which is easy to obtain.

7. The present invention has the advantages of reasonable structure, convenient construction operation, improved work efficiency, and easy guarantee of construction quality.

Description of drawings

1 is a schematic diagram of the structure of the wet joint on the top of the cover beam in a specific embodiment of the present invention, wherein (a) is an elevation view of a transverse bridge, and (b) is an elevation view of a longitudinal bridge;

2 is a schematic diagram of the structure of the wet joint at the end of the cover beam transverse bridge in a specific embodiment of the present invention, wherein (c) is an elevation view of the transverse bridge, (d) is an I-I sectional view, and (e) is an II- Section II;

3 is a schematic diagram of the structure of the wet joint at the end of the cover beam transverse bridge in a specific embodiment of the present invention;

Figure 4 is a schematic diagram of the wet joint reinforcement at the top of the cover beam in a specific embodiment of the present invention, wherein (f) is the first reinforcement arrangement, (g) is the second reinforcement arrangement, and (h) is a plan view.

Each number in the picture: 1- pier column, 2-cover beam, 3-top wet joint, 4-prefabricated cover beam, 5-end wet joint, 7-internal post-casting section of end wet joint, 8 - Outer prefabricated sections of wet joints at the ends, 9-U-shaped or annular wet-joint reinforcement, 10-rebar along the bridge, 11-rebar in the transverse bridge.

Specific implementation method

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Example

The specific structure and construction method of the present invention are given in detail by the following embodiments and accompanying drawings.

This embodiment adopts the connection structure of the segmented prefabricated assembled cover beam, as shown in the accompanying drawings 1-4, and the description is as follows in conjunction with the accompanying drawings:

As shown in Figure 1-3, the cover beam 2 consists of a prefabricated cover beam 4 and a post-cast top wet joint 3, and the prefabricated cover beam 4 is installed on the top of the pier column 1.

The present embodiment adopts the construction steps of the connection structure of the segmented prefabricated and assembled cover beams as follows:

1. The prefabricated cover beam 4 is constructed in the factory, and U-shaped or annular wet-joint steel bars 9 are reserved at the top of the cover beam and at the end of the transverse bridge direction;

2. The prefabricated cover beams 4 are transported to the site, and the left and right prefabricated cover beams 4 are independently hoisted and placed on the bridge piers;

3. Construction of the joint between the prefabricated cover beam 4 and the pier column 1, the joint technology can use grouting sleeve connection, grouting metal bellows connection or high-performance concrete as wet joint material, etc.;

4. Install wet-joint steel bars, pour wet-joint concrete, tension part of the prestress as needed, and complete the cover beam assembly construction.

As shown in the wet joint structure on the top of the cover beam in Figure 1, the post-cast top wet joint 3 is set on the top of the prefabricated cover beam 4, and there is no need to set the load-bearing bottom formwork on site, only the side formwork needs to be set.

As shown in the wet joint structure of the cover beam transverse bridge end portion in FIG. 2 , the post-cast end wet joint 5 is provided at the transverse bridge end portion of the cover beam 2 .

As shown in Figure 3, another wet joint structure at the end of the cover beam transverse bridge, the wet joint at the end of the bridge, in order to reduce the workload of on-site formwork, the wet joint 5 can be divided into two parts: the internal post-casting section 7 and the outer prefabricated section 8. This form also avoids exposure of color differences between precast concrete and wet-jointed concrete.

Figure 4 is a schematic diagram of the wet joint reinforcement at the top of the cover beam. As shown in Figure 4(f), the prefabricated cover beam reserves the wet joint reinforcement 9, and the bridge-direction reinforcement 10 and the transverse bridge-direction reinforcement 11 are arranged on site. The wet joint reinforcement 9 and the bridge-directed reinforcement 10 can be staggered on the plane. As shown in Fig. 4(h), the transverse bridge-direction steel bar 11 can be arranged on the inner side or the outer side of the bridge-direction steel bar 10, as shown in Figs. 4(f) and 4(g). Equivalently, refer to Figure 4 for the rebar arrangement of the wet joint at the end of the cover beam.

The wet joint arrangement and reinforcement arrangement in Figure 1-4 can be adjusted according to the actual stress requirements of the cover beam, and the figure is only for illustration. Only the top wet seam of the cover beam or the wet seam to the end of the transverse bridge can be used, or both forms can be used at the same time.

Claims (7)

1. a connection structure of segmented prefabricated and assembled cover beam is characterized in that, the cover beam is divided into two prefabricated pieces along the bridge direction, and is connected by the wet joints arranged on the top of the cover beam, the transverse bridge direction end, and the prefabricated The cover beam is connected as a whole and bears the role of the load; the reserved steel bars for the wet joint are arranged on the outer surface side of the main structure of the prefabricated cover beam, and the prefabricated cover beam does not need a large number of grooves, which is convenient for the prefabrication of the cover beam and the construction of the wet joint on site . 2. The connection structure of the segmented prefabricated and assembled cover beams according to claim 1, wherein the reinforcement and prestressed arrangement of the prefabricated cover beams are not affected by the wet joints, and the continuity of the prefabricated structure is maintained. completeness. 3 . The connection structure of the segmented prefabricated and assembled cover beams according to claim 1 , wherein the top wet joints can be arranged in combination with the support and cushion stones, making full use of the conventional structure space and being economical. 4 . 4 . The connection structure of the segmented prefabricated and assembled cover beams according to claim 1 , wherein the wet joint material is high-performance concrete or ultra-high-performance concrete. 5 . 5. The connection structure of the prefabricated and assembled cover beam as claimed in claim 1, wherein the connection structure is mainly in the form of a long wet seam at the top, and the wet seam at the end of the transverse bridge can be provided or not as required. set up. 6. The connection structure of the segmented prefabricated cover beam as claimed in claim 1, characterized in that, in order to reduce the work load of the on-site formwork, the outer surface can be partially prefabricated, and the interior can be poured after the wet seam at the end of the transverse bridge. Wet joint, this form also avoids the exposed color difference between precast concrete and wet joint concrete. 7. a construction method of the connection structure of a segmented prefabricated cover beam, is characterized in that, its steps are: Prefabricated cover beams are constructed in the factory, and annular wet joint reinforcement bars are reserved at the top of the cover beams and at the ends of the transverse bridge direction; The prefabricated beams are transported to the site, and the left and right prefabricated cover beams are independently hoisted and placed on the piers; When constructing the joint between the prefabricated cover beam and the pier column, the joint technology can use grouting sleeve connection, grouting metal bellows connection or high-performance concrete as wet joint material, etc.; Install wet-joint steel bars, pour wet-joint concrete, tension part of the prestress as needed, and complete the cover beam assembly construction.

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