CN211171558U - Modular ultra-high performance concrete prefabricated beams adaptable to different spans - Google Patents

Abstract

The utility model belongs to the technical field of bridge engineering, and discloses a modular ultra-high-performance concrete prefabricated assembled beam suitable for different spans. A standard unit is spliced together. Both the standard unit and the side support unit are provided with a first turning device at the bottom of the web where they are spliced to each other for the high-strength prestressed steel bars to pass through. For the prestressed steel bundle pipes extending out of the high-strength prestressed steel bars, the outlet end of the prestressed steel bundle pipes is provided with an anchoring device to anchor the high-strength prestressed steel bars; Sure. The prefabricated main beam unit of the utility model is convenient for factory prefabrication and transportation, and the side support unit, the standard unit and the middle support unit can be freely selected according to the span of the bridge, and the number of high-strength prestressed steel bars can be changed to realize the modular type of the bridge. configuration.

Description

Modular ultra-high performance concrete prefabricated beams adaptable to different spans

technical field

The utility model relates to the technical field of bridge engineering, in particular to a modular ultra-high-performance concrete prefabricated assembling beam suitable for different spans.

Background technique

At present, most prefabricated prestressed concrete T-beam bridges use ordinary concrete, which has the advantages of simple structure, material saving, clear force, convenient erection and installation, and large spanning capacity. The economic span of ordinary concrete T-beam is generally 25m ~ 40m . However, the hoisting weight of a single-piece T-beam will become heavier as the span increases. At present, the hoisting weight of a 40m single-piece T-beam has reached 140t, which requires strict hoisting equipment and construction technology. The problem that the proportion of the dead load of the large-span T-beam is too large can be solved by replacing ordinary materials with high-performance materials, such as using ultra-high-performance concrete instead of ordinary concrete.

Ultra-high performance concrete is the most innovative cement-based engineering material in the past three decades. UHPC has high toughness, high compressive strength and excellent durability, basically no shrinkage under thermal curing conditions, and long-term The creep under load is very small (about 1/10 of ordinary concrete). UHPC is a promising new building material in the field of civil engineering because of its good material properties. . The current research shows that: under the same conditions, the UHPC structure can reduce the dead weight by 20% to 40% compared with the ordinary concrete structure, and has a large spanning capacity, which can be applied to a span of 30 to 60 m.

However, if the in-service prefabricated T-beam bridge cannot meet the requirements of the new design specifications and needs to be replaced, the lack of prefabricated yard on the bridge site and the excessive hoisting weight of traditional concrete beams will greatly affect the progress of the repair and renovation of the old bridge. , If it can be prefabricated in advance in the factory, it can solve the problem of lack of prefabrication field on site, but the prefabrication in the factory will also have transportation problems, because the length of the main beam is 20-60m, and the traditional transportation tools are inefficient.

SUMMARY OF THE INVENTION

The technical problem solved by the utility model is to overcome the defects of the prior art, and to provide a modular ultra-high performance concrete prefabricated beam that can be assembled immediately according to bridge needs and can be adapted to different spans.

The purpose of the present utility model is achieved through the following technical solutions:

A modular ultra-high-performance concrete prefabricated assembly beam adapting to different spans is formed by splicing a plurality of prefabricated main beam units penetrating through high-strength prestressed steel bars. The prefabricated main beam unit includes side supports located at both ends of the prefabricated assembly beam. The unit and at least one standard unit located between the two edge support units, the standard unit and the edge support unit are both provided with a plurality of first turning devices at the bottom of the web at the mutually spliced part for the high-strength prestressed steel bars to pass through and Turning, the other end of the side support unit is pre-embedded with a prestressed steel bundle pipe on the web plate for the high-strength prestressed steel bar to extend, and the outlet end of the prestressed steel bundle pipe is provided with an anchoring device to anchor the high-strength prestressed steel bar.

The number of high-strength prestressed steel bars running through each prefabricated main beam unit is positively correlated with the square of the span of the prefabricated assembled beam.

Further, the prefabricated main beam unit also includes at least one middle support unit arranged between the standard units, and the middle support unit and the standard unit are each provided with a plurality of second turning devices at the bottom of the web where they are spliced to each other for high strength. The prestressed steel bars are passed through and turned, and a plurality of third turning devices are arranged at the top of the web for the central section of the middle support unit in the length direction for the high-strength prestressed steel bars to pass through and turn.

Furthermore, each prefabricated main beam unit has widened portions on both sides of the web where the first steering device and/or the second steering device are arranged.

Still further, the prefabricated main beam unit also has widened portions on both sides of the web where the third steering device is arranged.

Still further, a plurality of first steering devices and second steering devices are respectively distributed in the web and the widened portion of the prefabricated main beam unit.

Still further, after installing the high-strength prestressed steel bar, the first turning device and/or the second turning device in the web needs to be poured with slurry to bond the steel bundle of the high-strength prestressed steel bar to the concrete of the prefabricated main beam unit. .

Further, the prefabricated main beam units are spliced in a key tooth structure at the splicing place, and the interface glue is coated between the key teeth.

Furthermore, the prefabricated assembled beam has a pier support at the position where the middle support unit is provided with the third steering device.

Further, a plurality of prestressed steel bundle pipes on the side support unit are arranged in a vertical direction on the web.

Further, the length of the prefabricated main beam unit is 10-20m.

Compared with the prior art, the utility model has the following beneficial effects:

1) The prefabricated assembled beam is composed of multiple prefabricated main beam units, which is convenient for factory prefabrication and fast transportation. According to the span specification of the prefabricated assembled beam, the side support unit, standard unit and middle support unit can be freely selected. , by tensioning high-strength prestressed steel bars to make multiple prefabricated main beam units form a whole, only need to change the number of high-strength prestressed steel bars, and truly realize the modular configuration of the bridge;

2) The adjacent prefabricated main beam units are spliced by the key-tooth structure that can improve the shear resistance of the section to further improve the overall structural strength of the prefabricated assembled beams;

3) Each prefabricated main beam has a widened part at the turning position of the high-strength prestressed steel bar, and the widened part can be used as the turning block of the external prestressed steel beam at the same time. larger to provide sufficient shear resistance for the location;

4) The length of the prefabricated main beam unit of the present application is shorter than that of the traditional prefabricated main beam, which is convenient for transportation and hoisting, and is especially suitable for reconstruction and expansion projects.

Description of drawings

Fig. 1 is the structural schematic diagram of the modular ultra-high performance concrete prefabricated beam that adapts to different spans described in embodiment 1;

2 is a schematic structural diagram of the standard cell described in Embodiment 1;

Fig. 3 is I-I sectional view in Fig. 2;

Fig. 4 is a sectional view of II-II in Fig. 2 (the sectional view of II-II in Fig. 5 and Fig. 8 is the same as that of Fig. 4 );

5 is a schematic structural diagram of the side support unit described in Embodiment 1;

FIG. 6 is a sectional view of III-III in FIG. 5;

Fig. 7 is the structural schematic diagram of the modular ultra-high performance concrete prefabricated beam that adapts to different spans described in embodiment 2;

8 is a schematic structural diagram of the middle support unit described in Embodiment 2;

FIG. 9 is a sectional view of IV-IV in FIG. 8 .

Detailed ways

The present utility model will be further described below in conjunction with the specific embodiments, wherein, the accompanying drawings are only used for exemplary description, and what is shown is only a schematic diagram, not a physical drawing, and should not be construed as a limitation on the present patent; in order to better illustrate the present utility model In the new embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

Example 1

Provides a modular ultra-high performance concrete prefabricated beam that adapts to different spans, generally suitable for simply supported girder bridges with a span of about 30m, as shown in Figure 1, Figure 2 and Figure 5. The modular ultra-high performance concrete prefabricated assembled beam is composed of a plurality of prefabricated main beam units running through high-strength prestressed steel bars 1. The prefabricated main beam unit includes edge support units 2 located at both ends of the prefabricated assembled beam and two One or two standard units 3 between each side support unit, the standard unit 3 and the side support unit 2 are each provided with a plurality of first turning devices 41 at the bottom of the web A where they are spliced to each other for high-strength prestressed steel bars 1. Passing through and turning. In this embodiment, the number of the first turning devices is 3. The first turning devices are arranged in a straight line on the standard unit and the side support unit, and the other end of the side support unit 2 is pre-embedded on the web A There are prestressed steel bundle pipes 5 for high-strength prestressed steel bars to extend. The number of prestressed steel bundle pipes is equal to that of the first steering device. The prestressed steel bundle pipes 5 are installed in an inclined shape with the ends facing upwards. An anchoring device 6 is provided at the end to anchor the high-strength prestressed steel bar.

The purpose of this embodiment is to freely select the coordination of different prefabricated main beam units, and to form a prefabricated assembled beam with a required span by changing the reinforcement conditions of the beam body. The square of the span of the prefabricated assembled beam is positively correlated, which is mainly determined according to the flexural bearing capacity and structural rigidity requirements of the prefabricated assembled beam. Generally speaking, the larger the span of the prefabricated assembled beam, the more high-strength prestressed steel bars are required. In general, the standard unit and the side support unit can be made with a unified template. When assembling the required simply supported girder bridge, the side support units are arranged at both ends, and one or more standard units are arranged in the middle, which is the implementation of this implementation. Example of modular design ideas.

A certain number of common steel bars 71 and/or pre-tensioned prestressed steel bars 72 are also arranged at the bottom of each prefabricated main beam unit according to the stress requirements of the prefabricated assembled beams. Common steel bars include longitudinal steel bars, stirrups, bent steel bars, transverse steel bars, Structural steel bars, etc. Pre-tensioned prestressed steel bars are generally made of high-strength prestressed steel wires or steel strands. The number of prestressed steel bars, their arrangement positions, and tension control stress must be calculated and determined according to the load on the prefabricated assembled beams to achieve safety and economy. balance.

In order to increase the structural strength of each prefabricated girder unit at the splicing point, each prefabricated girder unit has widened parts B on both sides of the web A where the first steering device is installed, that is, the end section of the prefabricated girder unit needs to be increased. As shown in Figures 4 and 6, the cross-section of each prefabricated main beam is generally T-shaped or I-shaped with horseshoes as shown in Figure 3, and a plurality of first steering devices 41 are partly arranged on the web A, partly arranged on the plush On the wide part B, and the plurality of first steering devices are arranged horizontally, at this time, the widened part B becomes the steering block of the external high-strength prestressed steel bar. The high-strength prestressed steel bar in this embodiment has a concave shape as a whole, with only one trough.

Optionally, after installing high-strength prestressed steel bars and tensioning the steel bundles, the first turning device 41 located in the web A may further add grouting slurry to cause adhesion between the steel bundles and the concrete of the precast main beam unit. junction, the high-strength prestressed steel bars there become bonded prestressed steel bars.

The prefabricated main beam units are spliced in a key tooth structure at the splicing point, wherein the key tooth structure at both ends of the standard unit 3 is a complementary key tooth (that is, the male key tooth and the concave key tooth are complementary), and the two side supports located at both ends of the prefabricated assembled beam The key teeth structure on the unit 2 also needs to be complementary key teeth, and the interface glue is coated between the key teeth 8. The key tooth structure can improve the shear resistance of the splicing section. In addition, the widened part at the end of each prefabricated main beam unit can also widen the key tooth structure, so that the size of the shear key at this location is larger, which can provide sufficient shear resistance.

As shown in Fig. 6, a plurality of prestressed steel bundle pipes 5 on the side support unit are arranged in a vertical direction on the web (the end of the side support unit in Fig. 5 only shows one prestressed pipe steel bundle and An anchoring device does not represent the actual number), this arrangement is mainly considered from the aspects of force and anchoring space.

The span of the prefabricated main beam unit is designed to be 10-15m, and the modularization and standardization of the prefabricated assembled beam can be realized through the combination of multiple prefabricated main beam units. Compared with the traditional prefabricated main beam starting from 20 meters, the length of the prefabricated main beam unit of this embodiment is shorter, which is convenient for transportation and hoisting, and is especially suitable for reconstruction and expansion projects.

The prefabricated main beam unit is prefabricated with ultra-high performance concrete, which has light weight, good durability and large spanning capacity.

Example 2

This embodiment provides a modular ultra-high-performance concrete prefabricated assembled beam that adapts to different spans, and is generally suitable for multi-span continuous girder bridges with a span of about 40 to 70 m, as shown in Figures 7 and 8. The difference of Example 1 is that the prefabricated main beam unit also includes a middle support unit 9 arranged between the standard units 3, and the middle support unit 9 is provided with a plurality of first and second support units at the bottom of the web where the standard unit is spliced with each other. Two turning devices 42 are used for passing and turning the high-strength prestressed steel bars. The second turning device 42 and the first turning device 41 are arranged in a continuous shape. A plurality of third turning devices are provided at the top of the web in the center section of the middle support unit in the length direction. The device 43 is used for passing and turning the high-strength prestressed steel bars. The number of the second steering device and the third steering device is equal to that of the first steering device. A plurality of third steering devices are arranged horizontally. Of course, the setting positions of the third steering devices can also be determined according to the structural force analysis of the prefabricated main beam unit, and are not limited to the above positions.

As shown in FIG. 9 , the prefabricated main beam unit also has the same widening portion B as in the first embodiment on both sides of the web at the location where the second steering device and the third steering device are installed.

The middle support unit 9 and the standard unit 3 are also spliced by key teeth 8, and the key teeth structures at both ends of the middle support unit are also complementary key teeth, so as to form continuous splicing with other prefabricated main beam units.

The high-strength prestressed steel bars in this embodiment are in a wave shape as a whole, forming a wave crest when passing through the third turning device, and forming a wave trough when passing through the first turning device and the second turning device. A bridge pier C is also added at the location of the device to support the location.

The length of the middle support unit can generally be designed to be about twice that of the standard unit, and the length of the middle support unit in this embodiment is 15-20 m.

Obviously, the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims (10)

1. The utility model provides a adapt to prefabricated roof beam of assembling of modulus formula ultra high performance concrete of different strides, a serial communication port, it forms by the concatenation of a plurality of prefabricated girder units that run through there being the high-strength prestressed reinforcement, prefabricated girder unit is including the limit support unit that is located prefabricated assembly roof beam both ends and being located at least one standard cell between two limit support units, standard cell and limit support unit all are equipped with a plurality of first turning device high-strength prestressed reinforcement and pass and turn to in the web bottom department of the department of splicing each other, the pre-buried prestressed steel bundle pipeline that has the high-strength prestressed reinforcement to stretch out of limit support unit other end on the web, prestressed steel bundle pipeline exit end is equipped with anchoring device and anchors high-strength prestressed steel reinforcement.

2. The modular ultra-high performance concrete precast assembled beam adapting to different spans according to claim 1, wherein the precast main beam unit further comprises at least one middle support unit arranged between the standard units, a plurality of second steering devices and high-strength prestressed steel bars are arranged at the bottom of the web plate at the joint of the middle support unit and the standard units and penetrate and steer, and a plurality of third steering devices and high-strength prestressed steel bars are arranged at the top of the web plate at the central section of the middle support unit in the length direction.

3. The modular ultra-high performance precast concrete assembled beam for various spans according to claim 2, wherein each precast main beam unit has a widened portion at both sides of the web at the position where the first steering means and/or the second steering means are provided.

4. The modular ultra-high performance precast concrete assembled beam for different spans according to claim 3, wherein the precast main beam unit also has a widened portion at both sides of the web at the position where the third steering means is provided.

5. The modular ultra-high performance concrete precast split beam for different spans according to claim 3 or 4, wherein a plurality of the first steering device and the second steering device are respectively distributed in the web and the widened part of the precast main beam unit.

6. The modular ultra-high performance precast concrete assembled beam adapting to different spans according to claim 5, wherein the first steering device and/or the second steering device in the web plate is/are added with pouring slurry after the high-strength prestressed steel bars are installed, so that the steel bundles of the high-strength prestressed steel bars are bonded with the precast main beam unit concrete.

7. The modular ultra-high performance concrete precast assembled beam suitable for different spans according to claim 1, wherein the precast main beam units are spliced in a key tooth structure at the splicing position, and interface glue is coated between the key teeth.

8. The modular ultra-high performance concrete precast split beam for different spans according to claim 2, wherein the precast split beam has pier supports at positions where the third steering means is provided to the middle support unit.

9. The modular ultra-high performance precast concrete assembled beam suitable for different spans according to claim 1, wherein the plurality of prestressed steel bundle pipes on the side bearer unit are arranged in a vertical direction on the web.

10. The modular ultra-high performance concrete precast assembled beam suitable for different spans according to claim 1 or 2, wherein the length of the precast main beam unit is 10-20 m.

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