CN212052265U - Combined box girder - Google Patents

Abstract

The utility model provides a composite box girder, which relates to the technical field of bridge design and construction. The composite box girder comprises: a first beam section and a second beam section, and the first beam section and the second beam section are There is a first gap between them, a first connecting piece and a second connecting piece are arranged in the first gap, the first connecting piece is connected with the flange plate of the first beam section, and the second connecting piece is connected with The flange plates of the second beam section are connected, the first connecting piece and the second connecting piece are fixed by a first binding piece, and the first gap is poured with concrete so that the first beam section and the A first seam is formed between the second beam segments. The first beam section and the second beam section of the composite box girder do not need to be manufactured on site, and can be transported to the site after manufacturing, so that the on-site workload is relatively small, the impact on the environment is reduced, and the difficulty of quality control is reduced.

Description

Combined box girder

technical field

The utility model relates to the technical field of bridge design and construction, in particular to a combined box girder.

Background technique

At present, for urban viaducts and interchange hub projects, ultra-wide box girder and special-shaped bridge structures are inevitable.

According to the road alignment requirements and the changing characteristics of the road longitudinal and transverse slopes, in the overall layout design of the bridge, the complex special-shaped section at the ramp connection needs to use a special-shaped and widened curved bridge, which is often expressed in the shape of "herringbone" and "pants". structure.

In the past, design schemes such as multi-chamber box girder special-shaped structures were generally adopted. The multi-chamber ultra-wide box girder is a non-standardized special-shaped structure, and the structural force is complex. In addition to the bending moment and shear force, there is also a large torque and warping double moment action. Due to the complexity of its structure, it can only be constructed by cast-in-place brackets, which requires a large amount of on-site work, a high impact on the environment, and difficult quality control.

Utility model content

The purpose of the present utility model is to provide a combined box girder, so as to solve the technical problem that the box girder on-site workload is large in the prior art.

The technical scheme of the present utility model is achieved in this way:

A composite box girder, comprising: a first girder section and a second girder section, a first gap is formed between the first girder section and the second girder section, and a first connecting piece is arranged in the first gap and a second connector, the first connector is connected with the flange plate of the first beam section, the second connector is connected with the flange plate of the second beam section, the first connector The second connecting piece is fixed by a first binding piece, and the first gap is poured with concrete so that a first joint is formed between the first beam segment and the second beam segment.

In a feasible embodiment, the first beam segment is provided with a first transverse plate along the width direction, the second beam segment is provided with a second transverse plate along the width direction, and the first transverse plate and the second transverse plate are arranged along the width direction. There is a second gap between the diaphragms, one side of the first diaphragm is provided with a third connector, one side of the second diaphragm is provided with a fourth connector, the third connector The fourth connecting piece is fixed by a second binding piece, and the second gap is poured with concrete so that a second joint is formed between the first diaphragm and the second diaphragm.

In a feasible embodiment, the first connecting member and the second connecting member are both U-shaped steel bars, and the openings of the U-shaped steel bars face the first beam section or the second beam section connected thereto.

In a feasible embodiment, the first connecting members and the second connecting members are distributed in a staggered manner along the extending direction of the first gap.

In a feasible embodiment, the first gap is provided with a first main rib along an extending direction, and the first main rib passes through the first connecting piece and the second connecting piece.

In a feasible embodiment, first bolt holes are provided on the bottom surface of the flange plate of the first beam segment and the bottom surface of the flange plate of the second beam segment, and the first bolt holes are used for installation Bottom side template.

In a feasible embodiment, both the top surface of the flange plate of the first beam section and the top surface of the flange plate of the second beam section are provided with second bolt holes, and the second bolt holes are for installing suspension rods.

In a feasible embodiment, third bolt holes are provided on both the first diaphragm plate and the second diaphragm plate, and the third bolt holes are used for installing diaphragm plate formwork.

In a feasible implementation, the second gap is provided with a second main rib along the extending direction, and the second main rib passes through the third connecting piece and the fourth connecting piece.

In a feasible embodiment, the number of the first diaphragm plate and the second diaphragm plate are both plural, and the plurality of the first diaphragm plate are spaced apart along the extending direction of the first beam segment A plurality of the second transverse baffles are arranged at intervals along the extending direction of the second beam segment.

Compared with the prior art, the composite box girder of the present invention has at least the following advantages:

The composite box girder of the utility model includes two beam sections, which are a first beam section and a second beam section respectively. The first beam section and the second beam section can be manufactured separately. The beam section and the second beam section are transported to the construction site, the first connecting piece on the first beam section and the second connecting piece on the second beam section are bound together by the first binding piece, and the first beam section and the second connecting piece on the second beam section are bound together. Concrete is poured between the second beam sections, so that the first beam section and the second beam section are connected, and the bridge pavement formed by the combination of the first beam section and the second beam section is wider, so as to meet the change of the bridge in the opposite section. wide demand. It can be seen from the above that the first beam section and the second beam section do not need to be manufactured on site, and can be transported to the site after manufacturing, so that the on-site workload is relatively small, the impact on the environment is reduced, and the difficulty of quality control is reduced.

The manufacturing method of the composite box girder provided by the present application has at least the same advantages as the above-mentioned composite box girder, and details are not described herein again.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the structural representation one of the composite box girder provided by the embodiment of the present utility model;

2 is a second structural schematic diagram of a composite box girder provided by an embodiment of the present utility model;

3 is a schematic structural diagram of a mid-span cross-section of a composite box girder provided by an embodiment of the present utility model;

4 is a schematic structural diagram of a cross-section at the diaphragm of a composite box girder provided by an embodiment of the present utility model;

Fig. 5 is the structural schematic diagram of the cross section at the fulcrum of the composite box girder provided by the embodiment of the present utility model;

6 is a schematic diagram of the relative positions of the first beam section and the second beam section according to an embodiment of the present invention;

FIG. 7 is a partial schematic view of the first gap in FIG. 6;

8 is a schematic diagram 1 before the first gap is poured according to an embodiment of the present utility model;

9 is a schematic diagram 2 before the first gap is poured according to an embodiment of the present utility model;

10 is a schematic diagram 1 of the construction process of the first joint and the second joint provided by the embodiment of the present invention;

11 is a second schematic diagram of the construction process of the first joint and the second joint provided by the embodiment of the present invention;

12 is a schematic structural diagram before the second gap is poured according to an embodiment of the present utility model;

FIG. 13 is a schematic structural diagram of a second seam provided by an embodiment of the present invention.

In the figure: 11-first beam segment; 12-first diaphragm; 13-first connector; 14-third connector; 21-second beam; 22-second diaphragm; 23-first Two connecting pieces; 24- the fourth connecting piece; 31- the first seam; 32- the second seam; 33- the first binding piece; 34- the flange plate; 35- the second binding piece; 36- the suspension rod ; 37 - tie rod; 41 - bottom side template.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, 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. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that is usually placed when the utility model product is used, only for the convenience of describing the present utility model and simplifying the description, not Indicating or implying that the hydraulic oil tank or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Some embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

first embodiment

As shown in FIGS. 1-13 , the composite box girder provided by the embodiment of the present invention includes: a first beam section 11 and a second beam section 21 , and a first beam section 11 and the second beam section 21 have a first beam section between them. A first connecting piece 13 and a second connecting piece 23 are arranged in the first gap, the first connecting piece 13 is connected with the flange plate 34 of the first beam section 11 , and the second connecting piece 23 is connected with the The flange plates 34 are connected, the first connecting piece 13 and the second connecting piece 23 are fixed by the first tying piece 33, and the first gap is poured with concrete so that the first beam section 11 and the second beam section 21 form a second beam. A seam 31.

Specifically, the first beam section 11 and the second beam section 21 are both large box beams. The first beam section 11 and the second beam section 21 do not need to be manufactured on site, and can be transported to the construction site after the manufacturing is completed. It is only necessary to assemble the first beam section 11 and the second beam section 21, so that the on-site construction amount is relatively smaller.

The method of separately manufacturing large box girders and pouring wet joints in the first gap not only adapts well to the widened beam section, but also takes into account the structural stress at the same time, reduces complex structural problems, improves construction convenience and landscape requirements, and Reduce environmental impact.

In a preferred embodiment, the first beam section 11 and the bottom area of the second beam section 21 are also connected. Specifically, the first beam section 11 is provided with a first diaphragm 12 along the width direction, and the second beam section is 21 is provided with a second diaphragm 22 along the width direction, there is a second gap between the first diaphragm 12 and the second diaphragm 22, and a third connecting member 14 is provided on one side of the first diaphragm 12, One side of the second diaphragm 22 is provided with a fourth connecting member 24 , the third connecting member 14 and the fourth connecting member 24 are fixed by a second binding member 35 , and concrete is poured in the second gap to make the first diaphragm 12 A second seam 32 is formed with the second diaphragm 22 . In this way, between the first beam section 11 and the second beam section 21, not only the pouring concrete wet joint treatment is performed at the first gap, but also the pouring concrete wet joint treatment is also performed at the second gap, so as to improve the first beam section. The connection strength between 11 and the second beam segment 21.

The first diaphragm 12 is arranged at the bottom area of the first beam section 11, and the number of the first diaphragm 12 is multiple. A diaphragm 12, a plurality of first diaphragms 12 are distributed at intervals along the extending direction of the first beam section 11, and second diaphragms 22 are provided at the end and mid-span of the second beam section 21. The number of the two diaphragms 22 is the same as the number of the first diaphragms 12 , and the installation positions of the second diaphragms 22 correspond to the positions of the first diaphragms 12 . The first diaphragms 12 and the second diaphragms The plates 22 are distributed in a one-to-one correspondence.

Both the first beam section 11 and the second beam section 21 have two side flange plates 34. For the convenience of distinction, the side flange plates 34 on the first beam section 11 that are close to the second beam section 21 and the second beam section 21 The side flange plate 34 close to the first beam segment 11 is called the inner flange plate 34 , and the other side flange plate 34 on the first beam segment 11 and the other side flange plate on the second beam segment 21 are referred to as the inner flange plate 34 . 34 are all referred to as outboard flange plates 34 . The first connecting member 13 is arranged on the inner flange plate 34 of the first beam section 11 , and the second connecting member 23 is arranged on the inner flange plate 34 of the second beam section 21 . The width of the outer flange plate 34 of the first beam section 11 and the width of the outer flange plate 34 of the second beam section 21 are determined according to the bridge alignment.

When the composite box girder has a widened section, the width of the first gap can be controlled to remain unchanged, but by changing the width of the inner flange plate 34 of the first beam section 11 and/or the inner flange of the second beam section 21 The width of the plate 34 can be adjusted to meet the requirement of changing the width of the widened section of the composite box girder.

Alternatively, the width of the inner flange plate 34 of the first beam segment 11 and the width of the inner flange plate 34 at the second two ends can be kept unchanged, and the width of the widened section of the composite box girder can be changed by changing the width of the first gap. This setting is convenient for prefabrication standardization.

In a feasible embodiment, the first connecting member 13 and the second connecting member 23 are both U-shaped steel bars, and the openings of the U-shaped steel bars face the first beam section 11 or the second beam section 21 connected thereto. As shown in FIG. 3 , when the first beam segment 11 is arranged on the left side and the second beam segment 21 is arranged on the right side, the opening of the first connecting member 13 faces left and the opening of the second connecting member 23 faces right. Further, the two arms of the U-shaped steel bar are up and down respectively.

Preferably, the U-shaped steel bar is painted with epoxy zinc-rich primer or other anti-rust measures are adopted to prevent the U-shaped steel bar from rusting.

In a possible embodiment, the first connecting pieces 13 and the second connecting pieces 23 are distributed alternately along the extending direction of the first gap. The number of the first connecting piece 13 and the second connecting piece 23 are both multiple, and the plurality of first connecting pieces 13 are distributed at intervals along the extending direction of the inner flange plate 34 of the first beam section 11, and a plurality of second connecting pieces The pieces 23 are spaced apart along the extending direction on the inner flange plate 34 of the second beam section 21 , and the second connecting pieces 23 are arranged between the adjacent first connecting pieces 13 .

In a feasible embodiment, the first gap is provided with a first main rib along the extending direction, and the first main rib passes through the first connecting piece 13 and the second connecting piece 23 .

In a feasible embodiment, the bottom surface of the flange plate 34 of the first beam section 11 and the bottom surface of the flange plate 34 of the second beam section 21 are both provided with first bolt holes, and the first bolt holes are used for installing the bottom side Template 41.

Further, both the top surface of the flange plate 34 of the first beam section 11 and the top surface of the flange plate 34 of the second beam section 21 are provided with second bolt holes, and the second bolt holes are used for installing the suspension rod 36 . As shown in FIG. 8 , the suspension rods 36 are used to further fix the position of the bottom side formwork 41 .

Alternatively, as shown in FIG. 9 , tie rods 37 may also be provided on both the first beam section and the second beam section, and the tie rods 37 penetrate through the flange plate 34 so as to be connected with the bottom side formwork 41 .

Both the first diaphragm 12 and the second diaphragm 22 are provided with third bolt holes, and the third bolt holes are used for installing the diaphragm formwork.

The second gap is provided with a second main rib along the extending direction, and the second main rib passes through the third connecting piece 14 and the fourth connecting piece 24 .

The composite box girder provided in this embodiment preferably adopts the construction method of segmental assembly. In addition, the scheme of jacking, whole-hole hoisting, or on-site full-support cast-in-place can also be used as required.

It should be noted that both the first binding member 33 and the second binding member 35 can be ring bars.

In order to facilitate the manufacture of the above-mentioned composite box girder, a manufacturing and construction release is provided below, which specifically includes:

manufacturing the first beam section and the second beam section, and making the first connector fixed to the flange plate of the first beam section, so that the second connector is fixed to the flange plate of the second beam section;

Assemble the first beam section and the second beam section, and adjust the width of the first gap between the first beam section and the second beam section;

Connect the bottom side formwork with the first beam segment and the second beam segment respectively, and the bottom side formwork is located below the first gap;

binding the first connecting piece and the second connecting piece together by the first binding piece;

Concrete is poured at the first gap to connect the first beam segment with the second beam segment.

In this way, the first beam section and the second beam section do not need to be manufactured on the bridge construction site, and can be transported to the site after the manufacturing is completed, and assembled on site. Therefore, the combined box girder manufactured by the above-mentioned manufacturing method has less on-site construction and less impact on the environment.

In a feasible embodiment, before pouring the concrete at the first gap, the method further includes: passing the first main rib through the first connecting piece and the second connecting piece along the extending direction of the first gap.

In a feasible embodiment, the process of connecting the bottom side formwork with the first beam section and the second beam section specifically includes: connecting the bottom side formwork with the bottom surface of the flange plate of the first beam section and the second beam section respectively through bolts The bottom surface connection of the flange plate of the beam segment;

A suspension rod is arranged above the first gap, the suspension rod is respectively connected with the top surface of the first beam section and the top surface of the second beam section, the suspension rod is connected with a pull rod, and the pull rod goes down through the first gap to reach the bottom Side formwork connection.

Alternatively, tie rods can also be provided on both the first beam section and the second beam section, and the tie rods penetrate through the flange plate so as to be connected with the bottom side formwork.

In a feasible embodiment, the manufacturing method of the composite box girder further comprises: connecting a diaphragm formwork between the first diaphragm plate of the first beam segment and the second diaphragm plate of the second beam segment;

Binding the third connector on the first diaphragm and the fourth connector on the second diaphragm together by a second tie;

A second main rib is inserted between the third connecting piece and the fourth connecting piece;

Concrete is poured at the second gap between the first diaphragm and the second diaphragm.

For example, the prefabrication steps for the first beam segment and the second beam segment are as follows:

Rebar binding, the first beam segment and the second beam segment are simultaneously bound on the tire frame;

The distance between the two tire frames is precisely controlled according to the spacing of the box beam sections;

The tire frame is movable in four directions to meet the current widening requirements between the first beam section and the second beam section;

First, adjust the spacing of the tire frame according to the width of the current composite box beam;

Ensure that the left and right widths of the steel bar binding match;

The reinforcing bars of the outer flange plate are bound in the conventional way;

The reinforcement of the inner flange plate is involved in the field casting of the first gap, and the first connector and the second connector are respectively provided. The first connector and the second connector are both U-shaped steel bars, and the first connector and the second connector are respectively set. The connectors are staggered;

Diaphragms are arranged at the midspan of the first beam section and the second beam section;

Reinforcing bars are reserved at the first diaphragm as the third connecting member, and reinforcing bars are reserved at the second diaphragm as the fourth connecting member.

During the period of considering beam storage, brush epoxy zinc-rich primer or take other anti-rust measures on the first and second connectors that are reserved for exposure.

step one:

(1) Assembly of bridge erection machine;

(2) Temporary supports are set on the top of the pier;

(3) The diaphragm on the top of the cast-in-place pier (the diaphragm on the top of the pier can also be prefabricated, and the bridge erection machine is placed on the corbel on the top of the pier);

(4) Remove the support of the pier top diaphragm;

(5) Complete the construction of all pier top diaphragms according to the above steps.

Step 2:

(1) The bridge erection machine hoisted the prefabricated first beam section and the second beam section;

(2) Paint epoxy resin on the joint between the first beam section and the second beam section, adjust the position to match, install it in place, and then stretch for temporary prestressing;

Step 3:

(1) The second gap between the diaphragms at both ends of the top of the pier;

(2) After the joint formed by pouring at the second gap reaches the design strength, the temporary anchoring of the pier top diaphragm shall be removed;

(3) Tension single-span prestress;

(4) Remove the suspension rod.

Step 4:

(1) The bridge erection machine is over the span, and the construction is repeated according to the above steps until the end of the joint.

(2) Tensioning full joint prestressing.

(3) Install permanent supports;

(4) Remove (chisel) the temporary buttresses, complete the transformation of the structural system, and place them on the permanent supports;

Step 5:

(1) After the span, install the bottom side formwork;

(2) Binding the first connecting piece and the second connecting piece with a binding piece;

(3) pouring concrete on site in the first gap;

(4) Installation of diaphragm formwork;

(5) binding the third connecting piece and the fourth connecting piece by the second binding piece;

(6) pouring concrete at the second gap;

(7) On-site tensioning of the entire transverse prestress.

(8) Complete the pouring at each second gap and the transverse prestress tensioning in sequence according to the above steps until the full joint construction is completed.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model Scope of technical solutions.

Claims (10)

1. A composite box girder, comprising: the first beam section and the second beam section are arranged, a first gap is formed between the first beam section and the second beam section, a first connecting piece and a second connecting piece are arranged in the first gap, the first connecting piece is connected with a flange plate of the first beam section, the second connecting piece is connected with a flange plate of the second beam section, the first connecting piece is fixed with the second connecting piece through a first bundling piece, and concrete is poured in the first gap to enable the first beam section and the second beam section to form a first joint.

2. The composite box girder according to claim 1, wherein the first girder section is provided with a first diaphragm plate in a width direction, the second girder section is provided with a second diaphragm plate in the width direction, a second gap is formed between the first diaphragm plate and the second diaphragm plate, a third connecting member is provided at one side of the first diaphragm plate, a fourth connecting member is provided at one side of the second diaphragm plate, the third connecting member and the fourth connecting member are fixed by a second binding member, and the second gap is cast with concrete so that a second joint is formed between the first diaphragm plate and the second diaphragm plate.

3. The combination box girder according to claim 1 or 2, wherein the first and second connectors are U-shaped reinforcing bars, and the opening of the U-shaped reinforcing bars faces the first or second girder section connected thereto.

4. The composite box girder according to claim 3, wherein the first connecting members and the second connecting members are staggered in the extending direction of the first gap.

5. The composite box girder according to claim 1, wherein the first gap is provided with a first main rib along an extending direction, and the first main rib passes through the first connecting member and the second connecting member.

6. The composite box girder according to claim 1, wherein the bottom surface of the flange plate of the first girder segment and the bottom surface of the flange plate of the second girder segment are each provided with a first bolt hole for installing an underside formwork.

7. The composite box girder according to claim 6, wherein the top surface of the flange plate of the first girder segment and the top surface of the flange plate of the second girder segment are each provided with a second bolt hole for mounting a suspension rod.

8. The composite box beam defined in claim 2 wherein, third bolt holes are provided in both the first and second diaphragms for mounting diaphragm plates.

9. The composite box girder according to claim 2, wherein the second gap is penetrated with a second main rib along the extending direction, and the second main rib passes through the third connecting member and the fourth connecting member.

10. The composite box girder according to claim 2, wherein the number of the first diaphragms and the number of the second diaphragms are plural, the plural first diaphragms are arranged at intervals along the extending direction of the first girder section, and the plural second diaphragms are arranged at intervals along the extending direction of the second girder section.

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