CN218621767U - Bent cap, bridge supporting structure with bent cap and bridge structure - Google Patents

Abstract

The embodiment of the application discloses a bent cap, a bridge supporting structure with the bent cap and a bridge structure, and relates to the technical field of road and bridge engineering, the bent cap comprises a bent cap body, wherein the bent cap body comprises a solid section and a hollow section which are sequentially connected in the length direction of the bent cap body, and the hollow section and the solid section are arranged at intervals; the hollow section is provided with a hollow inner cavity which is cylindrical, and the extending direction of the hollow inner cavity is parallel to the length direction of the bent cap body; the solid section is used for being connected with the pier stud, and the quantity of solid section is one more than the quantity of hollow section, and the both ends of the length direction of following of bent cap body are solid section. This application is through setting up cylindric hollow inner chamber for the bent cap, accords with the antidetonation design standard and does not change under the condition of bent cap outward appearance, can enough guarantee that the bent cap body has enough support width in order to prevent that the upper portion roof beam body from taking place to fall the roof beam under horizontal load effect such as earthquake and destroying, can reduce the bent cap dead weight again to reduce the earthquake effort of lower part pier stud, ensured safety.

Description

Bent cap, bridge supporting structure with bent cap and bridge structure

Technical Field

The application relates to the technical field of road and bridge engineering, in particular to a bent cap, a bridge supporting structure with the bent cap and a bridge structure.

Background

The capping beam is a cross beam, also called a cap beam, arranged on the top of the bent frame pier for supporting, distributing and transferring the load of the superstructure. The bridge pier (platform) or the row pile is provided with a beam made of reinforced concrete or less reinforced concrete. The main function is to support the upper structure of the bridge and transfer all the load to the lower structure, and there are bridge piles connected directly to the bent cap and bridge piles connected to the uprights and then to the bent cap.

For a beam structure bridge in a high-intensity earthquake region, when a lower structure bridge pier adopts a framed pier, the earthquake-resistant design mainly adopts a mode of reducing the dead weight of a beam body structure at the upper part of the bridge so as to reduce the earthquake action response of the bridge pier; the smaller the self weight of the upper beam body structure is, the smaller the earthquake acting force transmitted to the lower structure pier is; under the condition that the self-weight of the upper structure can not be reduced, the self-weight of the bent cap beam of the bent pier can be reduced so as to further reduce the seismic force transmitted to the pier column; if the dead weight of the bent cap is reduced, the sectional area of the bent cap itself needs to be reduced.

However, according to the latest highway bridge earthquake resistance design Specification (JTG/T2231-01-2020) item 11.2.1, the distance a from the upper structural beam end of the simply supported girder bridge and the continuous girder bridge to the capping beam edge of the pier is required to meet the following requirements:

a≥50+0.1L+0.8H+0.5Lk；

l is the total length of a tandem superstructure;

h is the average height of the pier supporting the superstructure;

lk is the largest single Kong Kuajing of the tandem superstructure;

as can be seen from the above formula analysis and the reference to fig. 1, the distance a from the beam end of the superstructure to the edge of the bent cap of the pier is limited to a minimum distance, and for a high-intensity seismic area, in order to meet the specification of anti-seismic measures and prevent the beam body from falling down and being damaged under the action of an earthquake, the top support width b should be increased as much as possible during the design of the bent cap, which is contradictory to the reduction of the area of the cross section of the bent cap required for the earthquake action of the pier.

Therefore, a construction measure which can ensure enough supporting width of the bent cap and reduce self weight of the bent cap is needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a main aim at provides a bent cap, has bridge bearing structure and bridge structures of this bent cap, aims at solving among the prior art based on the problem that the bent cap of antidetonation design can't compromise support width and self structure dead weight.

The technical scheme adopted by the application is as follows:

in a first aspect, an embodiment of the present application provides a capping beam, including:

the bent cap comprises a bent cap body, a bent cap body and a connecting piece, wherein the bent cap body comprises a solid section and a hollow section which are sequentially connected in the length direction of the bent cap body, and the hollow section and the solid section are arranged at intervals;

the hollow section is provided with a hollow inner cavity which is cylindrical, and the extending direction of the hollow inner cavity is parallel to the length direction of the bent cap body;

the solid section is used for being connected with the pier stud, and the quantity of solid section is one more than the quantity of hollow section, and the both ends of the length direction of following of bent cap body are solid section.

Optionally, the bent cap body further comprises a sleeve, two ends of the sleeve are sealed, and the sleeve is embedded in the hollow section to form a hollow inner cavity.

Optionally, the sleeve is made of plastic.

Optionally, the axis of the hollow cavity coincides with the axis of the hollow section parallel to the length direction of the bent cap body.

Optionally, the hollowing rate of the hollow section is 45% -55%.

Optionally, a plurality of supports are arranged on the beam surface of the bent cap body.

Optionally, the beam surface of the bent cap body is provided with a stop block at both ends along the length direction.

In a second aspect, an embodiment of the present application provides a bridge support structure, including a pier stud, a pile foundation, and a cap beam as provided in any one of the first aspect of the embodiment of the present application, wherein:

the quantity of pier stud is the same with the quantity of pile foundation, and the second end of every pier stud is connected with a pile foundation coaxial coupling respectively, and the first end of every pier stud is connected with a solid section respectively.

Optionally, the bridge support structure further comprises a tie beam, and adjacent pile foundations are connected through a tie beam.

In a third aspect, an embodiment of the present application provides a bridge structure, which includes precast beam slabs and a plurality of bridge support structures provided as in any one of the second aspect of the embodiments of the present application, where the precast beam slabs are erected between adjacent bridge support structures.

Compared with the prior art, the beneficial effects of this application are:

the embodiment of the application provides a bent cap, bridge bearing structure and bridge structure that has this bent cap, divide into hollow section and solid section with the bent cap body with whether being provided with hollow inner chamber, hollow section has hollow inner chamber, consequently, can make the structure dead weight reduce on the basis that does not change bent cap overall dimension, cross sectional area from the cross sectional direction is also corresponding to be reduced, hollow inner chamber is cylindric and extending direction is on a parallel with the length direction of bent cap body, so that the self structural strength of bent cap can satisfy the support to superstructure, because the cantilever part of bent cap also is the both ends of bent cap length direction, and near handing-over position of bent cap and pier stud, the bent cap can bear great shear force, after setting up to hollow, the bearing capacity that shears of bent cap cross-section can reduce, consequently, this application embodiment arranges hollow section and solid section interval, and the quantity of solid section is more than hollow section quantity one, solid section is used for being connected with the pier stud and obtaining stable support, make hollow section can be located between the pier stud, the cross-section beam has been guaranteed, especially, the shearing resistance of hollow section is arranged, make the dead weight of hollow section design to compromise dead weight and the bearing structure width under self.

Drawings

FIG. 1 is a schematic view of the support width of a prior art capping beam;

fig. 2 is a schematic structural diagram of a capping beam provided in an embodiment of the present application;

FIG. 3 isbase:Sub>A schematic cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a schematic structural diagram of a bent cap provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a bridge support structure according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a bridge support structure provided in an embodiment of the present application;

FIG. 7 is a schematic three-dimensional model of a bridge support structure provided in an embodiment of the present application;

fig. 8 is a schematic elevation view of a capping beam of a double pile structure provided in an embodiment of the present application;

FIG. 9 is a cross-sectional schematic view of the capping beam of FIG. 8;

FIG. 10 is a schematic cross-sectional view of a generally solid cap beam of the same dimensions as FIG. 8;

FIG. 11 is a graph of the bending moment of the cap beam of FIG. 8 under its own weight;

FIG. 12 is a deformation of the capping beam of FIG. 8 under its own weight;

FIG. 13 is a graph of the bending moment of the cap beam of FIG. 10 under its own weight;

FIG. 14 is a deformation of the capping beam of FIG. 10 under its own weight;

reference numerals: 1-capping beam body, 11-solid section, 12-hollow section, 13-sleeve, 121-hollow inner cavity, 2-stop block, 3-pier column, a-distance from beam end to capping beam edge, and b-capping beam top surface width.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the present embodiment are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Referring to the accompanying drawings 1-4, the embodiment of the application provides a bent cap, which comprises a bent cap body 1, wherein the bent cap body comprises a solid section 11 and a hollow section 12 which are sequentially connected in the length direction of the bent cap body, and the hollow section 12 and the solid section 11 are arranged at intervals; the hollow section 12 is provided with a hollow inner cavity 121, the hollow inner cavity 121 is cylindrical, and the extending direction of the hollow inner cavity 121 is parallel to the length direction of the bent cap body 1; the solid sections 11 are used for being connected with the pier stud 3, the number of the solid sections 11 is one more than that of the hollow sections 12, and the two ends of the bent cap body 1 in the length direction are both the solid sections 11.

In this embodiment, on the basis of not changing the external dimensions of the capping beam, the hollow cavity 121 is arranged inside the capping beam body 1 to reduce the self structural weight of the capping beam body 1, and the capping beam body 1 is divided into the hollow section 12 and the solid section 11 according to whether the hollow cavity 121 is arranged, the hollow cavity 121 in the hollow section 12 is cylindrical and the extending direction is parallel to the length direction of the capping beam body 1, while the area of the cross section in the width direction is reduced, so that the self structural strength of the capping beam body 1 can meet the support of the upper structure, the hollow section 12 and the solid section 11 are arranged at intervals, the number of the solid section 11 is one more than that of the hollow section 12, the solid section 11 is used for being connected with the pier stud 3 to obtain stable support, the hollow section 12 can be located between the pier studs 3, the reduction of the shear resistance and the seismic resistance of the cross section of the capping beam body 1 is avoided, thereby obtaining the capping beam body 1 which meets the design specifications and does not change the appearance, it is ensured that the capping beam body 1 has enough support width to prevent the upper beam body from falling under the horizontal load effect of an earthquake, and also can reduce the self-breaking load of the earthquake, thereby ensuring the safety of the pier stud 3.

The shear strength in this embodiment is an ultimate strength generated when the material is sheared, which reflects the ability of the material to resist shear slip, and is numerically equal to the tangential stress value on the shear plane, i.e., the ratio of the shear force formed on the shear plane to the failure area.

In the prior art, the capping beam can be divided into a prefabricated capping beam and a cast-in-place capping beam, and the capping beam in the embodiment of the application can be formed into a complete capping beam body 1 by respectively prefabricating half of the capping beam and finally combining and connecting the half of the capping beam together by adopting a prefabricating means; under the cast-in-place means of adoption, can increase sleeve 13 for bent cap body 1, as shown in figure 3, the both ends of sleeve 13 are sealed to embedded in hollow section 12, sleeve 13 no longer takes out as the centre form when pouring, has simplified the construction flow, and the inside of pouring completion back sleeve 13 then is as hollow inner chamber 121, has avoided adopting the mode of prefabricated combination to appear the joint line, reduces bent cap body 1's wholeness, bent cap body 1 integrated into one piece, has good mechanical properties. The sleeve 13 can be made of steel, plastic and the like, has certain strength, and can support the weight of concrete above the sleeve during pouring; on the basis of keeping the implementation effect, in order to avoid the increase of the cost, a sleeve 13 made of plastic material, such as a common PVC pipeline, can be selected; the size of the sleeve 13 is determined by calculation and analysis according to the material characteristics, the shearing resistance of the capping beam, the local pressure-bearing capacity and the like.

As shown in fig. 8-14, the conventional capping beam cross-sectional dimensions in the design were selected for comparison, i.e., a cross-sectional height H of 1.9 m and a capping beam width B of 2.3 m, as shown in fig. 9 for a hollow capping beam and in fig. 10 for a typical solid capping beam. Taking double piles as an example, the span distribution is 3.6 meters +9.65 meters +3.6 meters, the lengths of the hollow section and the solid section of the bent cap are respectively designed to be 6.85 meters and 5 meters, and the diameter of the circle on the section of the hollow section is 1.5 meters. The concrete needed by the solid bent cap with the same size accounts for 68.77, the concrete is adjusted to be hollow and then is 56.67, 12.1 concrete is saved, the resource is saved obviously, particularly for large-scale projects, the number of the bent cap can reach thousands, and the overall cost is greatly reduced.

Simplify to continuous beam structure system above bent cap, be about to the bent cap simplify to pier stud department support, as shown in figure 8, span distributes for 3.6 meters +9.65 meters +3.6 meters continuous beam, and the bent moment and the deformation of bent cap comparing conventional solid bent cap and the hollow bent cap of this application under the dead weight effect are bent: midspan section bending moment, as shown in fig. 11, the midspan section bending moment of the hollow bent cap is 241.8kn.m; as shown in fig. 13, the mid-span section bending moment of the solid capping beam is 764.4kn.m; midspan displacement: as shown in fig. 12, the midspan displacement of the hollow bent cap is 0.075mm; as shown in fig. 14, the mid-span displacement of the solid capping beam is 0.181mm; through the comparison, when the bent cap is set to be a hollow section, the effect on the midspan section under the self-weight effect of the structure can be obviously reduced, and after the load effect is reduced, the configuration quantity of the section reinforcing steel bars can be reduced, so that the resources can be further saved, and the project engineering investment can be reduced.

Because the capping beam of the bent frame pier is small in size, and meanwhile, for convenience in construction, a plastic sleeve 13 is arranged as an internal mold, the size of the sleeve 13 is adjusted by combining with the size of the capping beam body 1, the hollowing rate is controlled to be 45% -55%, 50% is the optimal hollowing rate, the hollowing rate in the embodiment of the application refers to the percentage of the area of a circle formed by the sleeve 13 on the cross section, which is the ratio of the area of the circle to the area of a rectangle, as shown in the attached drawing 3.

In one embodiment, as shown in fig. 3, in order to ensure that the structural strength of the hollow section 12 is ensured and the stress is uniformly dispersed, the axis of the hollow cavity 121 is arranged to coincide with the axis of the hollow section 12 parallel to the length direction of the bent cap body 1, so as to ensure uniform stress.

In one embodiment, as shown in fig. 1, in order to facilitate the installation of precast beam panels when erecting a bridge and ensure the stability of the structure, a plurality of supports 2 are provided on the beam surface of the first capping beam 11 away from the second capping beam 12, so that the load and deformation borne by the upper structure of the bridge can be reliably transmitted to the support structure of the lower part of the bridge.

In one embodiment, in order to facilitate the installation of the precast beam slab and ensure the stability of the structure when the bridge is erected, a plurality of supporting seats are arranged on the beam surface of the bent cap body 1, and the supporting seats are uniformly distributed on the beam surface and can reliably transfer the load and the deformation borne by the upper structure of the bridge to the supporting structure at the lower part of the bridge.

In an embodiment, as shown in fig. 2, in order to prevent the erected precast beam slab from falling to the two sides of the bridge deck, the stop blocks 2 are arranged on the beam surface of the cap beam body 1 and at the two ends along the length direction of the cap beam body, if a plurality of precast beam slabs are arranged side by side, and because the scheme of the application is suitable for places with frequent earthquakes, the stop blocks 2 can be arranged between the precast beam slabs arranged side by side to reduce risks.

With reference to fig. 5 to 7, based on the same inventive concept as the previous embodiments, the present application further provides a bridge supporting structure, which includes pier studs 3, pile foundations, and capping beams as provided in the present application, wherein: the quantity of pier stud 3 is the same with the quantity of pile foundation, and the second end of every pier stud 3 respectively with a pile foundation coaxial coupling, the first end of every pier stud 3 is connected with a solid section 11 respectively, can effectively increase the cross-section, especially the bearing capacity that shears of hollow section 12 place cross-sectional direction, on the basis of many pile foundations, in order to ensure the stability of lower part pile foundation, can set up a tie beam between adjacent pile foundations and connect.

Based on the same inventive concept as the previous embodiment, the embodiment of the present application further provides a bridge structure, which includes precast beam slabs and a plurality of bridge support structures provided in the embodiment of the present application, and the precast beam slabs are erected between adjacent bridge support structures.

The principle and the beneficial effects of the embodiment can be referred to the capping beam in the embodiment, a group of bridge supporting structures are formed after the pile foundation and the pier stud 3 are added, and then the precast beam slab is erected among a plurality of groups of bridge supporting structures, so that the bridge structure can be formed. Fig. 5 shows an embodiment of a double pile foundation, double pier stud 3, and fig. 6 shows an embodiment of a triple pile foundation, triple pier stud 3.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A capping beam, comprising:

the bent cap comprises a bent cap body, wherein the bent cap body comprises a solid section and a hollow section which are sequentially connected in the length direction of the bent cap body, and the hollow section and the solid section are arranged at intervals;

the hollow section is provided with a hollow inner cavity which is cylindrical, and the extending direction of the hollow inner cavity is parallel to the length direction of the bent cap body;

the solid section is used for being connected with the pier stud, the quantity of solid section is more than the quantity of hollow section one more, the both ends of the length direction of its edge of bent cap body are solid section.

2. The capping beam of claim 1 wherein the capping body further comprises a sleeve closed at both ends, the sleeve being embedded within the hollow section to form the hollow cavity.

3. The capping beam of claim 2 wherein the sleeve is plastic.

4. The capping beam of claim 1 wherein the axis of the hollow cavity coincides with an axis of the hollow section parallel to the length direction of the capping beam body.

5. The capping beam of claim 1 wherein the hollowing ratio of the hollow section is 45% to 55%.

6. The capping beam of claim 1 wherein the capping body has a plurality of pedestals on a beam face.

7. The capping beam of claim 1 wherein the capping body has stops on the beam face and at both ends along the length of the capping body.

8. A bridge support structure comprising piers, pilings and a cap beam as claimed in any one of claims 1 to 7, wherein:

the quantity of pier stud with the quantity of pile foundation is the same, one the second end of pier stud respectively with one pile foundation coaxial coupling, one the first end of pier stud is connected with a solid section respectively.

9. The bridge support structure of claim 8, further comprising a tie beam, wherein adjacent pile foundations are connected by one of the tie beams.

10. A bridge construction comprising precast beam panels and a plurality of bridge support structures according to claim 8 or 9, the precast beam panels being erected between adjacent bridge support structures.

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