CN209114299U - A single box multi-chamber box girder bridge - Google Patents

Abstract

The utility model provides a single-box multi-chamber box girder bridge, comprising a substructure, a single-box multi-chamber box girder, a bridge deck cast-in-place layer, a transverse prestressed steel bundle, a first longitudinal prestressed steel bundle and a second longitudinal prestressed steel bundle Stress steel beam, single box multi-chamber box girder includes two prefabricated side beams and a plurality of interconnected prefabricated middle beams located between the two prefabricated side beams, the prefabricated side beams and prefabricated middle beams of the I-beam structure can reduce lifting The requirement for lifting equipment during construction reduces the construction cost of the single-box multi-chamber box girder bridge; the first longitudinal prestressed steel bundle and the second longitudinal prestressed steel bundle improve the middle and lower parts of the prefabricated side beam and the prefabricated middle beam respectively. Stressed state; prefabricated side beams and prefabricated middle beams are prefabricated parts, which have the characteristics of high concrete quality, beautiful appearance and light weight; the first transverse prestressed steel bundle and the second transverse prestressed steel bundle can effectively strengthen the prefabricated side beams The lateral connection with the prefabricated center beam and the lateral connection between the adjacent prefabricated center beams.

Description

A single box multi-chamber box girder bridge

technical field

The utility model relates to the field of construction engineering, in particular to a single-box multi-chamber box girder bridge.

Background technique

The box girder structure has certain advantages in bridge construction because of its simple vision and shorter beam height than other types of bridges. Therefore, box girder bridges are widely used in the construction of highway bridges, municipal bridges and railway bridges. The box girders are mainly divided into prefabricated box girders and cast-in-place box girders. The prefabricated box girders are prefabricated on an independent site and erected in combination with bridge erecting machines or hoisting equipment after the completion of the lower part of the project. The prefabricated box girders are mostly small box girders with a single box and a single room. ; The cast-in-place box girder is a vertical formwork binding steel bar and pouring concrete on the project site, which can be a single-box single-chamber box girder or a single-box multi-chamber box girder type. However, in the existing structural technology, both the prefabricated box girder structure and the cast-in-place box girder structure have shortcomings, limitations or deficiencies in different aspects, and their specific manifestations are as follows:

A. Prefabricated box girder:

(1) Due to the high construction technology requirements and closed-section structure of prefabricated box girder, the concrete pouring quality of its web and lower flange plate is difficult to guarantee. Cracks or honeycomb pits.

(2) The inner space of the prefabricated small box girder is relatively small, the one-time concrete pouring and the removal of the inner mold are relatively troublesome, and the quality of the concrete in the box is not easy to inspect.

(3) Compared with the hollow slabs and T beams of the same span, the hoisting weight of the prefabricated small box girder is relatively large. For example, the hoisting weight of the prefabricated small box girder with a span of 40m is about 170 tons.

B. Cast-in-place box girder structure:

(1) Due to the influence of the tension space of the steel bundle and the allowable tension length of the single end, for the cast-in-place prestressed reinforced concrete continuous box girder bridge, the problem of the tension of the steel bundle and the construction in sections is difficult to solve, and it has always been Troubled bridge workers.

(2) The cast-in-place box girder needs to be erected with full-chamber supports. When the bridge crosses the river, the support has an adverse effect on the flooding of the river; when the bridge crosses the road, there are certain restrictions on the current traffic, especially in municipal engineering. Construction has a greater impact on traffic.

(3) In the construction of cast-in-place box girder, it is necessary to bind steel bars and pour concrete on site after the pre-pressing of the support is completed, and a certain maintenance period is required before the pre-stress tensioning can be carried out. The construction period is longer than that of prefabricated beams. In the tense project, its construction plan limited the progress of the project.

Utility model content

Based on this, the purpose of the present utility model is to provide a single-box multi-chamber box girder bridge, so as to provide a single-box multi-chamber box girder bridge with good quality, high strength, and easy assembly and construction.

The technical scheme of the utility model is as follows: a single-box multi-chamber box girder bridge, which comprises a substructure, a single-box multi-chamber box girder and a bridge deck cast-in-place layer, the single-box multi-chamber box girder is connected to all the bridges through a permanent support. the top connection of the substructure;

The single box multi-chamber box girder includes two prefabricated side beams and a plurality of interconnected prefabricated middle beams located between the two prefabricated side beams, and the adjacent prefabricated middle beams are connected by a transverse connection structure. , one end of each of the prefabricated side beams is respectively connected with one end of the adjacent prefabricated middle beam through the transverse connection structure;

The prefabricated side beams and the prefabricated middle beams are I-beam structures, and the two ends of the middle and bottom of the prefabricated side beams along the longitudinal direction are respectively connected with first longitudinal prestressed steel bundles. The two ends along the longitudinal direction of the bottom and the bottom are respectively connected with a second longitudinal prestressed steel bundle, and the two ends of the top and bottom of the single-box multi-chamber box girder along the lateral direction are respectively connected with a first transverse prestressed steel bundle and a second longitudinal prestressed steel bundle. Transverse prestressed tendons.

Optionally, the prefabricated side beam is composed of a first upper flange plate, a first lower flange plate and a first web to form an I-beam structure, and the top and bottom ends of the first web are respectively connected with the first web. An upper flange plate is connected to the first lower flange plate, and both ends of the first lower flange plate and the first web plate along the longitudinal direction are provided with first longitudinal prestressed steel bundles;

The prefabricated middle beam is composed of a second upper flange plate, a second lower flange plate and a second web to form an I-beam structure, and the top and bottom ends of the second web are respectively connected to the second upper flange. The plate is connected with the second lower flange plate, and the two ends of the second lower flange plate and the second web plate along the longitudinal direction are provided with second longitudinal prestressed steel bundles;

Both ends of the first upper flange plate and the second upper flange plate along the lateral direction are provided with first transverse prestressed steel bundles, and the first lower flange plate and the second lower flange plate are provided with first transverse prestressed steel bundles. Both ends along the transverse direction are provided with second transverse prestressed steel bundles.

Optionally, when the bridge is a straight-line equal-width bridge, the width of the first upper flange plate along the longitudinal direction is set to the same width, and the width of the first lower flange plate along the longitudinal direction is set to the same width. ;

The width of the second upper flange plate along the longitudinal direction is set to be equal width, and the width of the second lower flange plate along the longitudinal direction is set to equal width.

Optionally, when the bridge is a widened bridge, the width of the second upper flange plate in the longitudinal direction is set to be widened, and the width of the second lower flange plate in the longitudinal direction is set to be widened.

Optionally, when the bridge is a curved bridge with a certain radius of curvature, the outer flange of the first upper flange plate is arc-shaped.

Optionally, the first lower flange plate includes a first end and a second end opposite to the first end, and the first end is in a horseshoe shape.

Optionally, the first end extends outward by 20-50 cm.

Optionally, the transverse connection structure is a wet seam, and the first upper flange plate and the second upper flange plate adjacent to the first upper flange plate are connected by the wet seam , the first lower flange plate and the second lower flange plate adjacent to the first lower flange plate are connected by the wet seam, and the adjacent second upper flange plates are connected are connected by the wet seam, and the adjacent second lower flange plates are connected by the wet seam.

In order to achieve the same purpose, the utility model also provides a construction method of a single-box multi-chamber box girder bridge,

When the bridge is designed as a multi-span simply supported girder bridge, the following steps are involved:

S1. Carry out the construction of pile foundations, caps, bridge piers and cover beams in the engineering site, and simultaneously carry out the production of the prefabricated side beams and the prefabricated middle beams in the prefabrication yard;

S2. Install a plurality of temporary supports corresponding to the prefabricated side beams and the prefabricated middle beams on the cover beam, and install temporary supports on both sides of the temporary supports;

S3, hoisting the prefabricated side beam and the prefabricated middle beam to the temporary support and the temporary support;

S4, constructing the lateral connection structure, and simultaneously installing the permanent support;

S5. The first transverse prestressed steel bundle penetrates into the first upper flange plate and the second lower flange plate, and the second transverse prestressed steel bundle penetrates into the first lower flange plate and the second lower flange plate, and the first transverse prestressed steel bundle and the second transverse prestressed steel bundle are tensioned, and then the temporary support is removed;

S6, pouring the bridge deck cast-in-situ layer concrete, thereby forming the bridge deck cast-in-place layer at the top of the prefabricated side beam and the prefabricated middle beam;

S7, remove the temporary support;

S8. Construction of bridge deck pavement and ancillary facilities;

S9. Operation and opening to traffic;

When a bridge is designed as a continuous beam structure, the following steps are involved:

S1. Carry out the construction of pile foundations, caps, bridge piers and cover beams in the engineering site, and simultaneously carry out the production of the prefabricated side beams and the prefabricated middle beams in the prefabrication yard, wherein, in the first upper flange plate and all the The second upper flange plate is installed with a negative bending moment bellows;

S2. Install a plurality of temporary supports corresponding to the prefabricated side beams and the prefabricated middle beams on the cover beam, and install temporary supports on both sides of the temporary supports;

S3, hoisting the prefabricated side beam and the prefabricated middle beam to the temporary support and the temporary support;

S4, constructing the lateral connection structure, and simultaneously installing the permanent support;

S5. The first transverse prestressed steel bundle penetrates into the first upper flange plate and the second lower flange plate, and the second transverse prestressed steel bundle penetrates into the first lower flange plate and the second lower flange plate, and the first transverse prestressed steel bundle and the second transverse prestressed steel bundle are tensioned, and then the temporary support is removed;

S6. Pouring the continuous section concrete on the top of the pier between two adjacent spans to complete the system conversion;

S7, penetrating the negative bending moment steel bundle into the negative bending moment bellows, and tensioning the negative bending moment steel bundle;

S8, pouring the bridge deck cast-in-situ layer concrete, thereby forming the bridge deck cast-in-place layer at the top of the prefabricated side beams and the prefabricated middle beam;

S9, remove the temporary support;

S10. Construction of bridge deck pavement and ancillary facilities;

S101. Operation and opening to traffic.

Optionally, when the bridge is designed as a multi-span simply supported girder bridge, the step S1 includes the following steps:

S11. Calculate and analyze the bridge structure according to design parameters such as bridge span, load level, and bridge width, determine the structural dimensions of each of the single-box multi-chamber box girder, and then determine the structural dimensions of the prefabricated middle beam and the prefabricated side beam, and determining the arrangement of the prestressed tendons;

S12. Construction of prefabricated fields and pedestals;

S13, performing the installation and laying of the prefabricated side beam bottom form and the prefabricated middle beam bottom form on the pedestal;

S14. Bind the steel skeleton of the prefabricated side beam and the steel skeleton of the prefabricated middle beam respectively on the prefabricated side beam bottom form and the prefabricated middle beam bottom form, and bind the steel bars composing the prefabricated side beam on the precast side beam bottom form. The skeleton and the prefabricated transverse connection structure in the steel skeleton of the prefabricated middle beam;

S15, install longitudinal corrugated pipes and transverse corrugated pipes in the reinforced skeleton of the prefabricated side beams and the reinforced skeleton of the prefabricated middle beams, wherein a first transverse corrugated pipe is installed in the reinforced skeleton of the prefabricated side beams, installing a second transverse corrugated pipe in the steel skeleton of the prefabricated middle beam;

S16, performing the installation of the prefabricated side beam side formwork, the prefabricated side beam end formwork, the prefabricated middle beam side formwork and the prefabricated middle beam end formwork on the pedestal;

S17, pour concrete into the steel skeleton in the first pouring groove formed by the prefabricated side beam side form, the prefabricated side beam end form and the prefabricated side beam bottom form; Concrete is poured into the steel skeleton in the second pouring groove formed by the middle beam end form and the prefabricated middle beam bottom form; finally, the position of each of the transverse connection structures is checked;

S18, the prefabricated side beams and the prefabricated middle beams after the pouring are completed, and the curing time is greater than 7 days, and the strength and elasticity models of the concrete constituting the prefabricated side beams and the concrete of the prefabricated middle beams reach the design After 85% of the value, remove the prefabricated side beam side form, the prefabricated side beam end form, the prefabricated middle beam side form and the prefabricated middle beam end form;

S19. Insert the first longitudinal prestressed steel bundle into the longitudinal bellows provided in the prefabricated side beam, insert the second longitudinal prestressed steel bundle into the longitudinal bellows of the prefabricated middle beam, and wait until the After the first longitudinal prestressed steel bundle and the second longitudinal prestressed steel bundle are passed through, the first longitudinal prestressed steel bundle and the second longitudinal prestressed steel bundle are stretched;

S110. Carry out grouting and anchor sealing maintenance;

When the bridge is designed as a continuous girder bridge, the step S1 includes the following steps:

S11. Calculate and analyze the bridge structure according to design parameters such as bridge span, load level, and bridge width, determine the structural dimensions of each of the single-box multi-chamber box girder, and then determine the structural dimensions of the prefabricated middle beam and the prefabricated side beam, and determining the arrangement of the prestressed tendons;

S12. Construction of prefabricated fields and pedestals;

S13, performing the installation and laying of the prefabricated side beam bottom form and the prefabricated middle beam bottom form on the pedestal;

S14. Bind the steel skeleton of the prefabricated side beam and the steel skeleton of the prefabricated middle beam respectively on the prefabricated side beam bottom form and the prefabricated middle beam bottom form, and bind the steel bars composing the prefabricated side beam on the precast side beam bottom form. The skeleton and the prefabricated transverse connection structure in the steel skeleton of the prefabricated middle beam;

S15. Install longitudinal corrugated pipes, transverse corrugated pipes and negative bending moment steel bundle corrugated pipes on the steel skeleton of the prefabricated side beam and the steel skeleton of the prefabricated middle beam, wherein, in the steel skeleton of the prefabricated side beam installing a first transverse corrugated pipe, and installing a second transverse corrugated pipe in the steel skeleton of the prefabricated middle beam;

S16, performing the installation of the prefabricated side beam side molds, the prefabricated side beam end molds, the prefabricated middle beam side molds and the prefabricated middle beam end molds on the pedestal;

S17, pour concrete into the steel skeleton in the first pouring groove formed by the prefabricated side beam side form, the prefabricated side beam end form and the prefabricated side beam bottom form; Concrete is poured into the steel skeleton in the second pouring groove formed by the middle beam end form and the prefabricated middle beam bottom form; finally, the position of each of the transverse connection structures is checked;

S18, the prefabricated side beams and the prefabricated middle beams after the pouring are completed, and the curing time is greater than 7 days, and the strength and elasticity models of the concrete constituting the prefabricated side beams and the concrete of the prefabricated middle beams reach the design After 85% of the value, remove the prefabricated side beam side form, the prefabricated side beam end form, the prefabricated middle beam side form and the prefabricated middle beam end form;

S19. Insert the first longitudinal prestressed steel bundle into the longitudinal bellows of the prefabricated side beam, and insert the second longitudinal prestressed steel bundle into the longitudinal bellows of the prefabricated middle beam. After a longitudinal prestressed steel bundle and the second longitudinal prestressed steel bundle are passed through, tensioning the first longitudinal prestressed steel bundle and the second longitudinal prestressed steel bundle;

S110. Carry out grouting and anchor sealing maintenance.

Implementing the embodiment of the present utility model has the following beneficial effects:

The single box multi-chamber box girder bridge of the utility model has the following advantages:

(1) The single-box multi-chamber box girder of the present utility model comprises two prefabricated side beams and a plurality of interconnected prefabricated middle beams. The prefabricated side beams and the prefabricated middle beams are prefabricated parts, and have the advantages of high concrete quality, beautiful appearance and relatively heavy weight. The characteristics of light weight, in the construction process of single box multi-chamber box girder and bridge pier, the whole construction process has the characteristics of environmental protection;

(2) The prefabricated side beams and the prefabricated middle beams of the present utility model are I-beam structures, and in the production process of the prefabricated side beams and the prefabricated middle beams, there is no need to install and remove the inner mold, and the whole prefabrication process has the advantages of convenient construction and inspection and pouring Characteristics of the quality of the finished concrete;

(3) The prefabricated side beams and the prefabricated middle beams of the present invention are I-beam structures, and compared with the prefabricated parts of the same span and beam width, the prefabricated side beams and the prefabricated middle beams are lighter in weight, thereby reducing the hoisting construction. The requirements for lifting equipment in China and the construction cost of single-box multi-chamber box girder bridges are reduced;

(4) The first longitudinal prestressed steel bundle of the present utility model can apply longitudinal pressure to the prefabricated side beams, thereby effectively improving the stress state of the middle and lower parts of the prefabricated side beams, and the second longitudinal prestressed steel bundles can apply longitudinal pressure to the prefabricated middle beams. Apply longitudinal pressure to effectively improve the stress state of the middle and lower parts of the prefabricated middle beam;

(5) The first transverse prestressed steel bundle and the second transverse prestressed steel bundle of the present invention can not only effectively strengthen the lateral connection between the prefabricated side beam and the prefabricated middle beam and the lateral connection between the adjacent prefabricated middle beams , and can effectively improve the stress state of the outer edge of the prefabricated side beam.

The construction method of the single-box multi-chamber box girder bridge of the present invention has the following characteristics:

(1) the construction method that the single-box multi-chamber box girder bridge of the present utility model adopts is the prefabricated hoisting construction, the prefabricated side beams and the prefabricated middle beams are first made in the prefabricated field, and what the prefabricated side beams and the prefabricated middle beams adopt are standardized Therefore, the construction method of the utility model can not only speed up the construction progress, but also avoid the installation and disassembly of large-scale full-house brackets and formwork, and further, can be very good. Improve the construction environment and reduce the impact on the surrounding environment of the construction site, which has good social and economic benefits;

(2) The construction method of the single-box multi-chamber box girder bridge of the present invention is not only applicable to the bridge structure being a multi-span simply supported beam structure, but also applicable to the bridge structure being a continuous beam structure, and has the characteristics of a wide range of use;

(3) The construction method of the single-box multi-chamber box girder bridge of the present invention can ensure the stability, safety and convenience of the installation of the single-box multi-chamber box girder bridge, thereby further ensuring the entire single-box multi-chamber box girder bridge structure. The installation is in place, and the method is simple and feasible, and has good promotion value.

Description of drawings

FIG. 1 is a schematic structural diagram of a single-box multi-chamber box girder bridge of the present invention.

FIG. 2 is a schematic structural diagram of the prefabricated side beam of the present invention.

3 is a schematic structural diagram of the prefabricated middle beam of the present invention.

4 is a schematic structural diagram of a single box multi-chamber box girder of the present invention.

5 is a schematic cross-sectional structure diagram of the single-box multi-chamber box girder of the present invention at the mid-span.

6 is a schematic cross-sectional structure diagram of a single-box multi-chamber box girder at the top of a pier under the condition that the bridge structure of the present invention is a continuous girder structure.

7 is a schematic structural diagram of a single-box multi-chamber box girder bridge corresponding to steps S1 to S3 of the single-box multi-chamber box girder bridge construction method of the present invention.

8 is a schematic structural diagram of the single-box multi-chamber box girder bridge corresponding to steps S1 to S6 of the construction method of the single-box multi-chamber box girder bridge under the condition that the bridge of the present invention is a continuous girder structure.

9 is a schematic structural diagram of the single-box multi-chamber box girder bridge corresponding to steps S1 to S10 of the construction method of the single-box multi-chamber box girder bridge under the condition that the bridge of the present invention is a continuous girder structure.

10 is a step diagram of the construction method of the single-box multi-chamber box girder bridge under the condition that the bridge structure of the present invention is a multi-span simply supported girder.

11 is a step diagram of the construction method of the single-box multi-chamber box-girder bridge under the condition that the bridge structure of the present invention is a continuous beam.

12 is a step diagram of the construction method of the prefabricated side beam and the prefabricated middle beam under the condition that the bridge structure of the present invention is a multi-span simply supported beam.

13 is a step diagram of the construction method of the prefabricated side beam and the prefabricated middle beam under the condition that the bridge structure of the present invention is a continuous beam.

Description of reference numbers:

1. Pile foundation; 2. Cap; 3. Bridge pier; 4. Single-box multi-chamber box girder; 41. Prefabricated side beam; 411. The first upper flange plate; Flange plate; 4131, first end; 4132, second end; 42, prefabricated middle beam; 421, second upper flange plate; 422, second web plate; 423, second lower flange plate; 43, transverse Connection structure; 44, the first longitudinal prestressed steel bundle; 45, the second longitudinal prestressed steel bundle; 46, the first transverse prestressed steel bundle; 47, the second transverse prestressed steel bundle; 5, the bridge deck cast-in-place layer ; 6. Temporary support; 7. Permanent support; 8. Negative bending moment steel beam; 9. Cast-in-place continuous section.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to the present utility model. limits.

As shown in Figures 1 to 9, a single-box multi-chamber box girder bridge provided by the embodiment of the present invention includes a substructure, a plurality of single-box multi-chamber box girder 4 and a bridge deck cast-in-place layer 5. The substructure It includes pile foundation 1, cap 2, bridge pier 3 and cover beam. Pile foundation 1 is connected to the bottom end of cap 2, the top end of cap 2 is connected to the bottom end of bridge pier 3, and the top end of bridge pier 3 is connected to the bottom end of the cap beam. Connection, the single box multi-chamber box beam 4 is connected with the top of the cover beam through the permanent support 7;

The single box multi-chamber box girder 4 includes two prefabricated side beams 41 and a plurality of interconnected prefabricated middle beams 42 located between the two prefabricated side beams 41 , and the adjacent prefabricated middle beams 42 are connected by a transverse connecting structure 43 , one end of each prefabricated side beam 41 is respectively connected with one end of the adjacent prefabricated middle beam 42 through a transverse connection structure;

The prefabricated side beam 41 and the prefabricated middle beam 42 are I-beam structures, the middle and bottom of the prefabricated side beam 41 are connected with first longitudinal prestressed steel bundles 44 at both ends along the longitudinal direction, and the middle and bottom of the prefabricated middle beam 42 are longitudinally connected. Both ends of the direction are connected with a second longitudinal prestressed steel bundle 45, and the top and bottom of the single box multi-chamber box girder 4 are connected with a first transverse prestressed steel bundle 46 and a second transverse prestressed steel respectively at both ends along the transverse direction. Bundle 47.

Based on the above settings, the single-box multi-chamber box girder bridge of the present invention has the following advantages:

(1) The single box multi-chamber box girder 4 of the present invention includes two prefabricated side beams 41 and a plurality of interconnected prefabricated middle beams 42. The prefabricated side beams 41 and the prefabricated middle beams 42 are prefabricated parts, and have high concrete quality, With the features of beautiful appearance and light weight, in the construction process of the single box multi-chamber box girder 4 and the bridge pier 3, the whole construction process has the characteristics of environmental protection;

(2) The prefabricated side beams 41 and the prefabricated middle beams 42 of the present invention are of I-beam structures, and in the production process of the prefabricated side beams 41 and the prefabricated middle beams 42, there is no need to install and remove the inner mold, and the entire prefabrication process has the advantages of convenient Characteristics of construction and inspection of the quality of the finished concrete;

(3) The prefabricated side beams 41 and the prefabricated middle beams 42 of the present utility model are I-beam structures, and compared with the prefabricated parts of the same span and beam width, the prefabricated side beams 41 and the prefabricated middle beams 42 are lighter in weight, Therefore, the requirements for lifting equipment in the hoisting construction and the construction cost of the single-box multi-chamber box girder bridge are reduced;

(4) The first longitudinal prestressed steel bundle 44 of the present invention can apply longitudinal pressure to the prefabricated side beam 41, thereby effectively improving the stress state of the middle and lower parts of the prefabricated side beam 41, and the second longitudinal prestressed steel bundle 45 can Apply longitudinal pressure to the prefabricated middle beam 42, thereby effectively improving the stress state of the middle and lower parts of the prefabricated middle beam 42;

(5) The first transverse prestressed steel bundles 46 and the second transverse prestressed steel bundles 47 of the present invention can not only effectively strengthen the lateral connection between the prefabricated side beams 41 and the prefabricated middle beams 42 and the adjacent prefabricated middle beams 42 The lateral connection between them can be effectively improved, and the stress state of the outer edge of the prefabricated side beam 41 can be effectively improved.

In this embodiment, as shown in FIGS. 1 to 9 , in order to further improve the stress state of the middle and lower parts of the prefabricated side beam 41 and the stress state of the middle and lower parts of the prefabricated middle beam 42 , the prefabricated side beam 41 is formed by the first upper The flange plate 411, the first lower flange plate 413 and the first web plate 412 form an I-beam structure, and the top and bottom ends of the first web plate 412 are connected to the first upper flange plate 411 and the first lower flange plate respectively. 413 is connected, and the first lower flange plate 413 and the first web 412 are provided with a first longitudinal bellows in the longitudinal direction for connecting the first longitudinal prestressed steel bundle 44, and the first longitudinal prestressed steel bundle 44 is inserted into the first longitudinal bellows. In the longitudinal corrugated pipe, the two ends of the first lower flange plate 413 and the first web plate 412 along the longitudinal direction are provided with first longitudinal prestressed steel bundles 44;

The prefabricated middle beam 42 is composed of a second upper flange plate 421, a second lower flange plate 423 and a second web 422 to form an I-beam structure. The top and bottom ends of the second web 422 are respectively connected to the second upper flange plate. 421 is connected with the second lower flange plate 423. The second lower flange plate 423 and the second web plate 422 are provided with a second longitudinal corrugated pipe for connecting the second longitudinal prestressed steel bundle 45 in the longitudinal direction. The prestressed steel bundles 45 are inserted into the second longitudinal bellows, so that both ends of the second lower flange plate 423 and the second web 422 along the longitudinal direction are provided with the second longitudinal prestressed steel bundles 45;

Both ends of the first upper flange plate 411 and the second upper flange plate 421 in the lateral direction are provided with first transverse prestressed steel bundles 46, and the first lower flange plate 411 and the second lower flange plate 421 are arranged in the lateral direction There are second transverse prestressed steel bundles 47 at both ends of the . Specifically, the first longitudinal prestressed steel bundle 44 passes through the end of the longitudinal stress bellows located in the first longitudinal bellows, and is anchored at the two end faces of the first lower flange plate 413 along the longitudinal direction and the first longitudinal bellows by the anchoring device. A web 412 is located at both ends along the longitudinal direction; the second longitudinal prestressed steel bundle 45 passes through the end of the longitudinal prestressed bellows located in the second longitudinal bellows, and is anchored to the second lower flange plate by an anchoring device 423 at both end faces along the longitudinal direction and at both end faces of the second web 422 along the longitudinal direction; the first transverse prestressed steel bundle 46 passes through the end of the transverse stress bellows located in the first transverse bellows, and is anchored by anchoring The device is anchored at the two outermost end faces of the two first upper flange plates 411 in the transverse direction; the second transverse prestressed steel bundle 47 penetrates the end of the transverse stress bellows located in the second transverse bellows, and is anchored by The device is anchored at the outermost end faces of the two first lower flange plates 413 in the transverse direction;

The first upper flange plate 411 and the second upper flange plate 421 are provided with first transverse corrugated pipes for connecting the first transverse prestressed steel bundles 46 in the transverse direction, the first lower flange plate 413 and the second lower wing The edge plate 423 is provided with a second transverse corrugated tube for connecting the second transverse prestressed steel bundle 47 in the transverse direction;

Furthermore, according to the actual stress situation of the single box multi-chamber box girder, the user can adjust the number and spacing of the first transverse prestressed steel bundles 46 and the second transverse prestressed steel bundles 47, thereby strengthening the prefabricated side beams. The lateral connection between 41 and the prefabricated center beam 42 and the lateral connection between the adjacent prefabricated center beams 42 can effectively improve the stress state of the outer edge of the prefabricated side beams 41 .

In this embodiment, as shown in FIGS. 1 to 9 , in order to make the single-box multi-chamber box girder 4 better adapt to different types of bridges, when the bridge is a straight-line equal-width bridge, the first upper flange plate 411 is in the longitudinal direction. The width of the upper flange plate 413 is set to the same width, the width of the first lower flange plate 413 along the longitudinal direction is set to the same width; 423 The width in the longitudinal direction is set to the same width;

When the bridge is a widened bridge, the width of the second upper flange plate 421 in the longitudinal direction is set to be widened, and the width of the second lower flange plate 423 in the longitudinal direction is set to be widened;

When the bridge is a curved bridge with a certain curvature radius, the outer flange of the first upper flange plate 411 is arc-shaped, so that the single box multi-chamber box girder 4 can be applied to a curved bridge with a certain curvature radius.

In this embodiment, as shown in FIGS. 1 to 9 , the first lower flange plate 413 includes a first end 4131 and a second end 4132 opposite to the first end 4131 . The first end 4131 is in a horseshoe shape, and the first end 4131 It extends outward by 20-50 cm, so as to facilitate the installation of temporary supports or temporary supports 6 during the construction of the bridge.

In this embodiment, as shown in FIGS. 1 to 9 , in order to further enhance the connection tightness between the adjacent prefabricated side beams 41 and the prefabricated middle beams 42 and the connection tightness between the adjacent prefabricated middle beams 42 , the transverse connection structure 43 is a wet seam, the first upper flange plate 411 and the second upper flange plate 421 adjacent to the first upper flange plate 411 are connected by a wet seam, the first lower flange plate 413 and the second upper flange plate 421 are connected by a wet seam. The second lower flange plates 423 adjacent to the first lower flange plates 413 are connected by wet seams, the adjacent second upper flange plates 421 are connected by wet seams, and the adjacent second lower flange plates are connected by wet seams. The plates 423 are connected by wet seams. Specifically, the wet joints are filled with ultra-high performance concrete, which has high toughness, high compressive strength and excellent durability, basically no shrinkage under thermal curing conditions, and can withstand long-term loads. Under the action, its deformation is very small;

Of course, the adjacent prefabricated side beams 41 and the prefabricated middle beams 42 and the adjacent prefabricated middle beams 42 can also be connected by steel structure transverse connectors. The flange of the upper flange plate of the prefabricated beam and the flange of the lower flange plate are provided with reserved holes, and the flange of the upper flange plate of the other prefabricated beam and the flange of the lower flange plate are laterally connected to the embedded steel structure. Therefore, when hoisting and installing between two adjacent prefabricated beams, it is only necessary to insert the steel structure transverse connector into the corresponding reserved hole to realize the splicing between the two adjacent prefabricated beams. .

In this embodiment, as shown in Figures 1 to 9, in order to further meet the requirements of the telescopic and waterproof functions of the single-box multi-chamber box girder 4 and to avoid rainwater corrosion of the beam body, when the single-box multi-chamber box girder 4 is used for a simply supported beam In the case of bridges, the expansion and contraction amount is calculated according to the span length or joint length of the girder bridge, and according to the calculated expansion and contraction amount, expansion joints are installed at the top of the corresponding pier or the bridge deck is continuous; when the single box multi-chamber box girder 4 is used In the case of continuous girder bridges, according to the size of the joint length, the corresponding expansion joints are set at the beam ends of each continuous beam, and the pier tops are poured over the other piers 3 of the link where the expansion joints are set. Negative moment steel bundles are inserted into the negative moment bellows.

As shown in Figures 1 to 13, in order to achieve the same purpose, the utility model also provides a construction method for a single-box multi-chamber box girder bridge,

1) When the bridge is designed as a multi-span simply supported girder bridge, the following steps are included:

S1, carry out the construction of the pile foundation 1, the cap 2, the bridge pier 3 and the cover beam in the engineering site, and simultaneously carry out the production of the prefabricated side beams 41 and the prefabricated middle beams 42 in the prefabricated field;

S2, install a plurality of temporary supports 6 corresponding to the prefabricated side beams 41 and the prefabricated middle beams 42 on the cover beam, and install temporary supports on both sides of the temporary support 6;

S3, hoist the prefabricated side beam 41 and the prefabricated middle beam 42 to the temporary support 6 and the temporary support, and the temporary support can enhance the installation stability of the prefabricated side beam 41 and the prefabricated middle beam 42;

S4, construct the transverse connection structure 43, and install the permanent support 7 at the same time;

S5. The first transverse prestressed steel bundle 46 penetrates into the first upper flange plate 411 and the second lower flange plate 423, and the second transverse prestressed steel bundle 47 penetrates into the first lower flange plate 413 and the second lower flange edge plate 423, and perform tensioning and anchoring on the first transverse prestressed steel bundle 46 and the second transverse prestressed steel bundle 47, and then remove the temporary support;

S6, pouring the bridge deck cast-in-situ layer concrete, thereby forming the bridge deck cast-in-place layer 5 at the top of the single-box multi-chamber box girder 4;

S7, remove the temporary support 6;

S8. Construction of bridge deck pavement and ancillary facilities, and the ancillary facilities are anti-collision guardrails and other facilities;

S9. Operation and opening to traffic;

2) When the bridge is designed as a continuous beam structure, the following steps are included:

S1. Carry out the construction of the pile foundation 1, the cap 2, the bridge pier 3 and the cover beam in the engineering site, and simultaneously carry out the production of the prefabricated side beam and the prefabricated middle beam in the prefabricated field, wherein, on the first upper flange A negative bending moment bellows is installed on the plate and the second upper flange plate;

S2. Install a plurality of temporary supports 6 corresponding to the prefabricated side beams 41 and the prefabricated middle beams 42 on the cover beam, and install temporary supports on both sides of the temporary supports 6. The temporary supports can strengthen the prefabricated side beams 41 and the prefabricated middle beams 42. The installation stability of the middle beam;

S3, hoist the prefabricated side beam 41 and the prefabricated middle beam 42 to the temporary support 6 and the temporary support;

S4, construct the transverse connection structure 43, and install the permanent support 7 at the same time;

S5. The first transverse prestressed steel bundle 46 penetrates into the first upper flange plate 411 and the second lower flange plate 423, and the second transverse prestressed steel bundle 47 penetrates into the first lower flange plate 413 and the second lower flange edge plate 423, and perform tensioning and anchoring on the first transverse prestressed steel bundle 46 and the second transverse prestressed steel bundle 47, and then remove the temporary support;

S6. Pouring the continuous section concrete on the top of the pier between two adjacent spans to complete the system conversion;

S7, insert the negative bending moment steel bundle 8 into the negative bending moment bellows, and stretch the negative bending moment steel bundle 8, so as to solve the problem of the negative bending moment at the top of the continuous section pier;

S8, pouring the bridge deck cast-in-situ layer concrete, thereby forming the bridge deck cast-in-place layer 5 at the top of the prefabricated side beams 41 and the prefabricated middle beams 42;

S9, remove the temporary support 6;

S10. Construction of bridge deck pavement and ancillary facilities, and the ancillary facilities are anti-collision guardrails and other facilities;

S101. Operation and opening to traffic.

Based on the above settings, the construction method of the single-box multi-chamber box girder bridge of the present invention has the following characteristics:

(1) the construction method that the single-box multi-chamber box girder bridge of the present utility model adopts is prefabricated hoisting construction, and what the prefabricated side beams 41 and the prefabricated middle beams 42 adopt are standardized, factory-like and rapid mass modes to carry out production and construction, Therefore, the construction method of the present invention can not only speed up the construction progress, but also avoid the installation and disassembly of large-scale full house supports and formwork, and further, can well improve the construction environment, reduce the impact on the surrounding environment of the construction site, and has the advantages of good social and economic benefits;

(2) The construction method of the single-box multi-chamber box girder bridge of the present invention is not only applicable to the bridge structure being a multi-span simply supported beam structure, but also applicable to the bridge structure being a continuous beam structure, and has the characteristics of a wide range of use;

(3) The construction method of the single-box multi-chamber box girder bridge of the present invention can ensure the stability, safety and convenience of the installation of the single-box multi-chamber box girder bridge, thereby further ensuring the entire single-box multi-chamber box girder bridge structure. The installation is in place, and the method is simple and feasible, and has good promotion value.

Specifically, the continuous section concrete is cast in place on the top of the pier between two adjacent spans, thereby forming a continuous section 9 in place between the two adjacent spans.

In this embodiment, as shown in FIGS. 1 to 13 , in order to improve various quality indicators of the prefabricated side beams 41 and the prefabricated middle beams 42 in the prefabrication process and to speed up the project progress, the prefabricated side beams 41 and the prefabricated middle beams 42 are The process is as follows:

1) When the bridge is designed as a multi-span simply supported girder bridge, step S1 includes the following steps:

S11. Calculate and analyze the bridge structure according to design parameters such as bridge span, load level and bridge width, determine the structural dimensions of each single-box multi-chamber box girder 4, and then determine the structural dimensions of the prefabricated middle beam 42 and the prefabricated side beams 41, and determine the arrangement of the prestressed steel beams, so as to provide a theoretical basis for the manufacture of the prefabricated side beams 41 and the prefabricated middle beams 42;

S12. Construction of prefabricated fields and pedestals;

S13, the prefabricated side beam 41 bottom form and the prefabricated middle beam 42 bottom form are installed and laid on the pedestal;

S14. Bind the steel frame of the prefabricated side beam 41 and the steel frame of the prefabricated middle beam 42 on the bottom form of the prefabricated side beam 41 and the bottom form of the precast middle beam 42 respectively, and bind the steel frame of the precast side beam 41 and the prefabricated middle beam 41 together. The transverse connection structure 43 is pre-embedded in the steel frame of the beam 42, wherein the steel frame of the prefabricated side beam 41 and the steel frame of the prefabricated middle beam 42 are bent by a CNC steel bending machine;

S15, install longitudinal corrugated pipes and transverse corrugated pipes in the reinforced skeleton of the prefabricated side beam 41 and the reinforced skeleton of the prefabricated middle beam 42, wherein the first transverse corrugated pipe is installed in the reinforced skeleton of the prefabricated side beam 41, and in the prefabricated A second transverse corrugated pipe is installed in the steel skeleton of the beam 42;

S16, install the prefabricated side beam 41 side form, the prefabricated side beam 41 end form, the prefabricated middle beam 42 side form and the prefabricated middle beam 42 end form on the pedestal;

S17, pour concrete into the steel skeleton in the first pouring groove formed by the side mold of the prefabricated side beam 41, the end mold of the prefabricated side beam 41 and the bottom mold of the prefabricated side beam 41; Concrete is poured into the steel skeleton in the second pouring trough formed by the mould and the bottom mould of the prefabricated middle beam 42; finally, the position of each transverse connection structure 43 is checked;

S18. The prefabricated side beams 41 and the prefabricated middle beams 42 after the pouring are cured. After the curing time is more than 7 days, and the strength and elasticity model of the concrete constituting the prefabricated side beams 41 and the prefabricated middle beams 42 reach 85% of the design value Afterwards, remove the prefabricated side beams 41 and the prefabricated middle beams 42, wherein the prefabricated side beams 41 and the prefabricated middle beams 42 are maintained by the automatic spray curing system;

S19. Insert the first longitudinal prestressed steel bundle 44 into the first longitudinal bellows, insert the second longitudinal prestressed steel bundle 45 into the second longitudinal bellows, wait until the first longitudinal prestressed steel bundle 44 and the second longitudinal prestressed After the stress steel bundle 45 is threaded, the first longitudinal prestressed steel bundle 44 and the second longitudinal prestressed steel bundle 45 are tensioned, wherein the above-mentioned tensioning process is performed by intelligent tensioning equipment;

S110. Carry out grouting and anchor sealing maintenance, wherein, the grouting of the duct is carried out by an intelligent grouting system, and the sealing of the anchor can be carried out by fast-setting cement or gypsum;

2) When the bridge is designed as a continuous girder bridge, in step S1, the following steps are included:

S11. Calculate and analyze the bridge structure according to design parameters such as bridge span, load level and bridge width, determine the structural dimensions of each single-box multi-chamber box girder 4, and then determine the structural dimensions of the prefabricated middle beam 42 and the prefabricated side beams 41, and determine the arrangement of the prestressed steel beams, so as to provide a theoretical basis for the manufacture of the prefabricated side beams 41 and the prefabricated middle beams 42;

S12. Construction of prefabricated fields and pedestals;

S13, the prefabricated side beam 41 bottom form and the prefabricated middle beam 42 bottom form are installed and laid on the pedestal;

S14. Bind the steel frame of the prefabricated side beam 41 and the steel frame of the prefabricated middle beam 42 on the bottom form of the prefabricated side beam 41 and the bottom form of the precast middle beam 42 respectively, and bind the steel frame of the precast side beam 41 and the prefabricated middle beam 41 together. The transverse connection structure 43 is pre-embedded in the steel frame of the beam 42, wherein the steel frame of the prefabricated side beam 41 and the steel frame of the prefabricated middle beam 42 are bent by a CNC steel bending machine;

S15, install longitudinal corrugated pipes, transverse corrugated pipes and negative bending moment steel bundle corrugated pipes in the steel skeleton of the prefabricated side beam 41 and the steel skeleton of the prefabricated middle beam 42, wherein, install the No. A transverse corrugated pipe, a second transverse corrugated pipe is installed in the steel skeleton of the prefabricated middle beam 42;

S16, install the prefabricated side beam 41 side form, the prefabricated side beam 41 end form, the prefabricated middle beam 42 side form and the prefabricated middle beam 42 end form on the pedestal;

S17, pour concrete into the steel skeleton in the first pouring groove formed by the side mold of the prefabricated side beam 41, the end mold of the prefabricated side beam 41 and the bottom mold of the prefabricated side beam 41; Concrete is poured into the steel skeleton in the second pouring trough formed by the mould and the bottom mould of the prefabricated middle beam 42; finally, the position of each transverse connection structure 43 is checked;

S18. The prefabricated side beams 41 and the prefabricated middle beams 42 after the pouring are cured. After the curing time is more than 7 days, and the strength and elasticity model of the concrete constituting the prefabricated side beams 41 and the prefabricated middle beams 42 reach 85% of the design value Afterwards, remove the prefabricated side beams 41 and the prefabricated middle beams 42, wherein the prefabricated side beams 41 and the prefabricated middle beams 42 are maintained by the automatic spray curing system;

S19. Insert the first longitudinal prestressed steel bundle 44 into the first longitudinal bellows, insert the second longitudinal prestressed steel bundle 45 into the second longitudinal bellows, wait until the first longitudinal prestressed steel bundle 44 and the second longitudinal prestressed After the stress steel bundle 45 is threaded, the first longitudinal prestressed steel bundle 44 and the second longitudinal prestressed steel bundle 45 are tensioned, wherein the above-mentioned tensioning process is performed by intelligent tensioning equipment;

S110. Carry out grouting and anchor sealing maintenance, wherein the grouting of the duct is carried out by an intelligent grouting system, and the sealing of the anchor can be carried out by fast-setting cement or gypsum.

It should be understood that the terms "first", "second", etc. are used to describe various information in the present invention, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information without departing from the scope of the present invention.

The above is the preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and deformations can also be made. These improvements and deformations It is also regarded as the protection scope of the present invention.

Claims (8)

1. a kind of Single-box multi-chamber box beam bridge, which is characterized in that including substructure, Single-box multi-chamber box girder and bridge floor in-situ layer, institute It states Single-box multi-chamber box girder and is connect by permanent support with the top of the substructure；

The Single-box multi-chamber box girder includes two prefabricated side bars and multiple interconnections being located between two prefabricated side bars Prefabricated central sill, pass through transverse connection structure between the adjacent prefabricated central sill and connect, one end of each prefabricated side bar The one end for the prefabricated central sill being adjacent to respectively is connected by the transverse connection structure；

The prefabricated side bar and the prefabricated central sill are structural I-beam, and the middle part and bottom of the prefabricated side bar are along the longitudinal direction Both ends be connected separately with first longitudinal direction prestressed strand, the both ends of the middle part and bottom of the prefabricated central sill along the longitudinal direction point It is not connected with second longitudinal direction prestressed strand, the both ends of the top and bottom of the Single-box multi-chamber box girder in transverse direction connect respectively It is connected to the first lateral prestressing tendon and the second lateral prestressing tendon.

2. Single-box multi-chamber box beam bridge as described in claim 1, which is characterized in that the prefabricated side bar by the first top flange plate, First bottom wing listrium and the first web form structural I-beam, the top and bottom end of first web respectively with described first on Flange plate is connected with the first bottom wing listrium, and the both ends of the first bottom wing listrium and first web along the longitudinal direction are set There is first longitudinal direction prestressed strand；

The prefabricated central sill forms structural I-beam by the second top flange plate, the second bottom wing listrium and the second web, and described second The top and bottom end of web are connect with second top flange plate and the second bottom wing listrium respectively, the second bottom wing listrium Second longitudinal direction prestressed strand is equipped with the both ends of second web along the longitudinal direction；

The both ends of first top flange plate and second top flange plate in transverse direction are equipped with the first lateral prestressing tendon, The both ends of the first bottom wing listrium and the second bottom wing listrium in transverse direction are equipped with the second lateral prestressing tendon.

3. Single-box multi-chamber box beam bridge as claimed in claim 2, which is characterized in that described when bridge bridge wide for straight line First top flange plate along the longitudinal direction on width be set as wide, the first bottom wing listrium along the longitudinal direction on width be set as It is wide；

Second top flange plate along the longitudinal direction on width be set as wide, the second bottom wing listrium along the longitudinal direction on Width is set as wide.

4. Single-box multi-chamber box beam bridge as claimed in claim 2, which is characterized in that when bridge is to broaden bridge, described second Top flange plate along the longitudinal direction on width be set as broadening, the second bottom wing listrium along the longitudinal direction on width be set as becoming It is wide.

5. Single-box multi-chamber box beam bridge as claimed in claim 2, which is characterized in that when bridge is the song with certain curvature radius When line bridge, the outer side wing edge of first top flange plate is arc line shaped.

6. Single-box multi-chamber box beam bridge as claimed in claim 2, which is characterized in that the first bottom wing listrium include first end and The second end being oppositely arranged with the first end, the first end are in the shape of a hoof.

7. Single-box multi-chamber box beam bridge as claimed in claim 6, which is characterized in that the first end extends outwardly 20~50cm.

8. Single-box multi-chamber box beam bridge as claimed in claim 2, which is characterized in that the transverse connection structure is wet seam, institute It states the first top flange plate and second top flange plate adjacent with first top flange plate to connect by the wet seam, institute It states the first bottom wing listrium and the second bottom wing listrium adjacent with the first bottom wing listrium to connect by the wet seam, phase It is connected between adjacent second top flange plate by the wet seam, by described between adjacent the second bottom wing listrium Wet seam connection.