LU501216B1

LU501216B1 - Simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure

Info

Publication number: LU501216B1
Application number: LU501216A
Authority: LU
Inventors: Shengwu Ma; Longfei Wang; Cong Shi; Jianxun Liu; Yanwen Hu; Xitong Li; Chunming Zhang
Original assignee: Gansu Province Transp Planning Survey & Design Institute Co Ltd
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-07-06

Abstract

The present disclosure relates to the field of bridges, and specifically relates to a simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure. The structure comprises the following components, wherein a cast-in-place reinforced concrete bridge deck slab is arranged for connecting reinforced concrete bridge deck slabs of two adjacent span prefabricated composite box beams, a cast-in-place concrete section is arranged for connecting steel beams of the prefabricated composite box beams through shear-resistant and non-pull- resistant studs, common studs, prestressed steel bars and beam end steel plates, the prestressed steel bars are arranged in the lower portion of the cast-in-place concrete section to strengthen connection, a support is arranged below the cast-in-place concrete section to support on continuous piers, and the cast-in-place reinforced concrete slab is provided with internally prestressed tendons in negative bending moment areas, so a simply supported-continuous steel-concrete composite box beam was achieved. The structure solves the key problem that a concrete structure is connected with the steel- concrete composite box beam, the construction is extremely easy, the quality is easy to guarantee, the advantages of the continuous composite beam are fully exploited, and large-scale application is achieved, therefore, the simply supported-continuous steel- concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure has very wide practicability.

Description

BL-5349 SIMPLY SUPPORTED-CONTINUOUS STEEL-CONCRETE COMPOSITE Box ~~ -U°01216 BEAM PARTLY SHEAR-RESISTANT AND NON-PULL-RESISTANT

CONNECTING PIECE STRUCTURE TECHNICAL FIELD

[01] The present disclosure relates to the field of bridges, in particular to a simply supported-continuous steel-concrete composite box beam partly shear-resistant and non- pull-resistant connecting piece structure.

BACKGROUND ART

[02] A common continuous steel-concrete composite beam is generally not connected on continuous piers, because steel structures in the composite beam necessarily have certain errors in machining, deformations of two adjacent composite beams are different, and steel plates in the steel structure are thin, so that the two adjacent composite beams are difficult to connect. Meanwhile, a support is required to be arranged at the joint, and more support installing and reinforcing measures are taken, so that the connection is more difficult to build. In addition, for the continuous beam, the internal force of the beam on the continuous pier is large and this portion is a key part for structural bearing capacity of the beam, and the connection is better not to be set here. Therefore, the connecting part of the steel-concrete composite continuous beam is generally arranged at the edge part of the bridge span, so that the steel-concrete composite beam cannot be simply supported and then continuously constructed, and is not convenient to apply in a large scale. If a concrete structure is adopted for connection on the top of the continuous pier, the problem of connection between the steel beams and the concrete is inevitably involved, therefore the structure is usually only suitable for a box-shaped steel-concrete composite beam. However, due to the shear slip effect of the steel-concrete composite beam, the connecting structure can generate large tensile force, the tensile capacity of concrete is weak, damage is prone to occurring, and potential safety hazards may be caused. Along with social development, green environmental protection and sustainable development are more emphasized for bridge construction, so that a steel-concrete composite bridge has greater advantages compared with a concrete bridge, and its application prospect is wider and wider. Therefore, it is very significant to research the connection mode of the steel- concrete composite box beam to realize simple supporting and continuous construction, so that a large number of steel-concrete composite box beams can be applied to common span bridges.

SUMMARY

[03] The present disclosure aims to provide a simply supported-continuous steel- concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure to solve the problems in the prior art, so that a steel-concrete composite d box beam can be conveniently subjected to fabricated construction since it is simply supported first and then continuous, and the structure can be widely applied to common span continuous beam bridges.

[04] In order to achieve the above purpose, the present disclosure adopts the 1

BL-5349 following technical scheme: LU501216

[05] A simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure comprises the following components, wherein a cast-in-place reinforced concrete bridge deck slab is arranged in the upper portion of a simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece and used for connecting reinforced concrete bridge deck slabs of two adjacent span prefabricated composite box beams, and a cast-in-place concrete section is arranged in the lower portion of the simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece and used for connecting steel beams of the prefabricated composite box beams through shear-resistant and non-pull-resistant studs, common studs, prestressed steel bars and beam end steel plates, so that a continuous beam structure is formed; the upper portions of the front end and the rear end of the cast-in- place concrete section are provided with shear-resistant and non-pull-resistant studs and the lower portions of the front end and the rear end of the cast-in-place concrete section are provided with common studs to be connected with the beam end steel plates, the beam end steel plates are welded with the steel beams of the prefabricated composite box beams, the prestressed steel bars are arranged in the lower portion of the cast-in-place concrete section to strengthen connection, and a support is arranged below the cast-in- place concrete section and supported on continuous piers; and the upper portion of the simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece is provided with prestressed tendons in negative bending moment areas, and the prestressed tendons in the negative bending moment areas and the prefabricated composite box beams form a simply supported-continuous steel-concrete negative bending box beam.

[06] The shear-resistant and non-pull-resistant studs are arranged on the upper portions of the front end and the rear end of the cast-in-place concrete section, each of which is distributed at the upper 65% part of the height of the cast-in-place concrete section, and the common studs are arranged at the lower 35% part of the heights of the lower portions of the front end and the rear end of the cast-in-place concrete section, one end of the shear-resistant and non-pull-resistant studs and one end of the common studs are welded with the beam end steel plates, and the rest parts are buried in the cast-in-place concrete section.

[07] The shear-resistant and non-pull-resistant stud is composed of a round steel rod and a steel sleeve, the round steel rod is made of a plain round steel rod, the length of the shear-resistant and non-pull-resistant stud is the same as that of the common stud, the steel sleeve is formed by welding a round steel pipe and a steel end plate, the steel sleeve sleeves the round steel rod, the round steel rods are welded to the beam end steel plates, the steel sleeves are buried in the cast-in-place concrete section, the inner diameter of the steel sleeve is slightly larger than the diameter of the round steel rod, and lubricating oil is coated inside the steel sleeve, so that the round steel rod can longitudinally slide relative to the steel sleeve.

[08] The prestressed steel bars are arranged in the cast-in-place concrete section with the common studs, the prestressed steel bar is a high-strength steel bar, and the prestressed 2

BL-5349 steel bar is anchored to the beam end steel plates at the two ends, so that the connection LU501216 of the common studs in the cast-in-place concrete section should not be damaged by pulling. One end of the prestressed steel bar is fixedly connected, the other end of the prestressed steel bar is tensioned, and the tensioned end can be tensioned for multiple times, so that compensated tensioning can be conveniently carried out according to the condition of prestressing loss in the operation period of the bridge.

[09] The beam end steel plates are arranged at the positions, at the continuous ends of the prefabricated composite box beams, of the steel beams, the upper portions of the beam end steel plates are connected with the shear-resistant and non-pull-resistant studs, the lower portions of the beam end steel plates are connected with the common studs, vertical stiffening ribs are arranged in the middle of the beam end steel plates, a top steel supporting plate is arranged in the tops of the beam end steel plates, the common studs are arranged on the top steel supporting plate, the beam end steel plates and the steel beams are welded with butt weld, the beam end steel plates are connected with the reinforced concrete bridge deck slabs of the prefabricated composite box beams and the cast-in-place reinforced concrete bridge deck slab through the common studs, and the beam end steel plates, the shear-resistant and non-pull-resistant studs and the common studs should be manufactured and installed when the composite box beams are prefabricated.

[10] The support is installed at the positions of the continuous piers below the cast- in-place concrete section, a leveling steel plate of the support is buried in the cast-in-place concrete section, after the support is installed, the cast-in-place concrete section and the cast-in-place reinforced concrete slab can be poured at a time, and the length of the cast- in-place concrete section in the longitudinal bridge direction is not smaller than the length required by installation of the support.

[11] Compared with the prior art, the present disclosure has the following technical effects:

[12] firstly, the shear-resistant and non-pull-resistant studs are arranged in the upper portion of the cast-in-place concrete section, the round steel rod can longitudinally slide relative to the steel sleeve under the action of tension generated by the shear slid effect, so that the round steel rod does not bear tension, and the round steel rod and the steel sleeve are still intact and can bear vertical shear force, therefore, the capacity of the shear- resistant and non-pull-resistant studs for bearing the shear load of a composite box beam is not affected;

[13] secondly, the cast-in-place concrete structure is adopted to connect a prefabricated steel-concrete composite box beam to form a continuous bridge, the continuous bridge is not affected by machining and installing errors of the two adjacent span prefabricated composite box beams, the leveling steel plate of the support can be buried in the lower portion of the cast-in-place concrete section according to requirements, and the beam end steel plates, the shear-resistant and non-pull-resistant studs and the common studs are installed on the prefabricated composite box beams in advance, therefore, the construction is extremely simple and convenient;

[14] thirdly, the connection problem of the continuous end of the prefabricated steel- concrete composite box beam on the tops of piers is solved, the steel-concrete composite 3

BL-5349 box beam can be prefabricated, erected and constructed, line production is formed, and LU501216 construction of a simply supported-continuous steel-concrete composite box beam bridge is achieved, and the steel-concrete composite box beam bridge can replace a common span concrete bridge which is widely applied at present, so that the practicability is extremely wide; and

[15] fourthly, the arrangement of the prestressed tendons in the negative bending moment areas is not affected, the concrete bridge deck slabs of the prefabricated composite box beams are pressed through the prestress in the negative bending moment area, and the midspan bending moment is relatively small, therefore, the advantages of the steel-concrete composite continuous beam are fully exploited.

BRIEF DESCRIPTION OF THE DRAWINGS

[16] To describe the technical schemes in the embodiments of the present discourse more clearly, the following briefly describes the attached figures required for describing the embodiments. Apparently, the attached figures in the following descriptions show merely some embodiments of the present disclosure, and a person of ordinary skill in the art may derive other drawings from these attached figures without creative efforts.

[17] FIG. 1 is a structural schematic diagram of the present disclosure;

[18] FIG. 2 is a schematic diagram of arrangement;

[19] FIG. 3 is an elevation schematic diagram of a shear-resistant and non-pull- resistant stud;

[20] FIG. 4 is a cross-section schematic diagram of a shear-resistant and non-pull- resistant stud;

[21] FIG. 5 is a cross-section schematic diagram of the structure; and

[22] FIG. 6 is a schematic diagram of a beam end steel plate.

[23] Reference signs: 1, simply supported-continuous steel-concrete composite box beam part shear-resistant and non-pull-resistant connecting piece; 2, cast-in-place reinforced concrete bridge deck slab; 3, prefabricated composite box beam; 4, reinforced concrete bridge deck slab; 5, cast-in-place concrete section; 6, shear-resistant and non- pull-resistant stud; 7, common stud; 8, beam end steel plate; 9, steel beam; 10, prestressed steel bar; 11, support; 12, prestressed tendon; 13, leveling steel plate; 14, round steel rod; 15, steel sleeve; 16, round steel pipe; 17, steel end plate; 18, lubricating oil; 19, vertical stiffening rib; 20, top steel supporting plate; and 21, prestressed steel bar hole.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[24] The following clearly and completely describes the technical scheme in the embodiments of the present disclosure with reference to the attached figures in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. Based on the embodiment in the present disclosure, all other embodiments obtained by the ordinary technical staff in the art under the premise of without contributing creative labor belong to the scope protected by the present disclosure.

[25] To make the foregoing objective, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure is further described in 4

BL-5349 detail below with reference to the attached figures and specific embodiments. LU501216

[26] As shown in FIG. 1 to FIG. 6, a simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure comprises the following components, wherein a cast-in-place reinforced concrete bridge deck slab 2 is arranged in the upper portion of a simply supported- continuous steel-concrete composite box beam partly shear-resistant and non-pull- resistant connecting piece 1 and used for connecting reinforced concrete bridge deck slabs 4 of two adjacent span prefabricated composite box beams 3, a cast-in-place concrete section 5 is arranged in the lower portion of the simply supported-continuous steel- concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece 1 and used for connecting steel beams 9 of the prefabricated composite box beams 3 through shear-resistant and non-pull-resistant studs 6, common studs 7, prestressed steel bars 10 and beam end steel plates 8, the prestressed steel bars 10 are arranged in the lower portion of the cast-in-place concrete section 5 to strengthen connection, a support 11 is arranged below the cast-in-place concrete section 5 and supported on continuous piers, the cast-in-place reinforced concrete slab 2 is provided with internally prestressed tendons 12 in negative bending moment areas, and the prestressed tendons 12 in the negative bending moment areas and the prefabricated composite box beams 3 form a simply supported-continuous steel-concrete composite box beam.

[27] The shear-resistant and non-pull-resistant studs 6 are arranged on the upper portions of the front end and the rear end of the cast-in-place concrete section 5 , each of which is distributed at the upper 65% part of the height of the cast-in-place concrete section 5, and the common studs 7 are arranged at the lower 35% part of the heights of the lower portions of the front end and the rear end of the cast-in-place concrete section 5, one end of the shear-resistant and non-pull-resistant studs 6 and one end of the common studs 7 are welded with the beam end steel plates 8, and the rest parts are buried in the cast-in-place concrete section 5. When the steel beams 9 of the prefabricated composite box beams 3 is manufactured, the beam end steel plates 8, the shear-resistant and non- pull-resistant studs 6 and the common studs 7 can be welded according to requirements and are welded with the steel beams 9 together, therefore, construction of the bridge on the continuous pier top site will be very simple and convenient.

[28] The shear-resistant and non-pull-resistant stud 6 is composed of a round steel rod 14 and a steel sleeve 15, the round steel rod 14 is made of a plain round steel rod, the length of the shear-resistant and non-pull-resistant stud 6 is the same as that of the common stud 7, the steel sleeve 15 is formed by welding a round steel pipe 17 and a steel end plate 16, the steel sleeve 15 sleeves the round steel rod 14, the round steel rods 14 are welded to the beam end steel plates 8, the steel sleeves 15 are buried in the cast-in-place concrete section 5, the inner diameter of the steel sleeve 17 is slightly larger than the diameter of the round steel rod 14, and lubricating oil 18 is coated inside the steel sleeve 15, so that the round steel rod 14 can longitudinally slide relative to the steel sleeve 15.

[29] The prestressed steel bars 10 are arranged in the cast-in-place concrete section with the common studs 7, the prestressed steel bar 10 is a high-strength steel bar, and the prestressed steel bar 10 is anchored to the beam end steel plates 8 at the two ends, so that the connection of the common studs 7 in the cast-in-place concrete section 5 should 5

BL-5349 not be damaged by pulling. One end of the prestressed steel bar 10 is fixedly connected, LU501216 the other end of the prestressed steel bar 10 is tensioned, and the tensioned end can be tensioned for multiple times, so that compensated tensioning can be conveniently carried out according to the condition of prestressing loss in the operation period of the bridge.

[30] The beam end steel plates 8 are arranged at the positions, at the continuous ends of the prefabricated composite box beams 3, of the steel beams 9, the upper portions of the beam end steel plates 8 are connected with the shear-resistant and non-pull-resistant studs 6, the lower portions of the beam end steel plates 8 are connected with the common studs 7, vertical stiffening ribs 19 are arranged in the middle of the beam end steel plates 8, a top steel supporting plate 20 is arranged in the tops of the beam end steel plates 8, the common studs 7 are arranged on the top steel supporting plate 20, the beam end steel plates 8 and the steel beams 9 are welded with butt weld, the beam end steel plates 8 are connected with the reinforced concrete bridge deck slabs 4 of the prefabricated composite box beams 3 and the cast-in-place reinforced concrete bridge deck slab 2 through the common studs 7, and the beam end steel plates 8, the shear-resistant and non-pull-resistant studs 6 and the common studs 7 should be manufactured and installed when the composite box beams 3 are prefabricated, so that the beams can be directly erected, installed and poured on the tops of the piers.

[31] The support 11 is installed at the positions of the continuous piers below the cast-in-place concrete section 5, a leveling steel plate 13 of the support 11 is buried in the cast-in-place concrete section 5, after the support 11 is installed, the cast-in-place concrete section 5 and the cast-in-place reinforced concrete slab 2 can be poured at a time, and the length of the cast-in-place concrete section 5 in the longitudinal bridge direction is not smaller than the length required by installation of the support 11.

[32] For those skilled in the art, obviously the present disclosure is not limited to the details of the exemplary embodiment, and the present disclosure can be achieved in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, for every point, the embodiments should be regarded as exemplary embodiments and are unrestrictive, the scope of the present disclosure is restricted by the claims appended hereto, and therefore, all changes, including the meanings and scopes of equivalent elements, of the claims are aimed to be included in the present disclosure. Any mark of attached figures in the claims should not be regarded to limit the involved claims.

[33] Further, it should be understood that although the present specification is described with reference to embodiments, not each embodiment contains only one independent technical scheme. The specification is so described just for clarity. Those skilled in the art should regard the specification as a whole, and technical schemes of various embodiments can be combined appropriately to form other implementations which can be understood by those skilled in the art.

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Claims

BL-5349 WHAT IS CLAIMED IS: LUs01216

1. A simply supported-continuous steel-concrete composite box beam partly shear- resistant and non-pull-resistant connecting piece structure, wherein a cast-in-place reinforced concrete bridge deck slab is arranged in the upper portion of a simply supported-continuous steel-concrete composite box beam partly shear-resistant and non- pull-resistant connecting piece and used for connecting reinforced concrete bridge deck slabs of two adjacent span prefabricated composite box beams, a cast-in-place concrete section is arranged in the lower portion of the simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece and used for connecting steel beams of the prefabricated composite box beams through shear-resistant and non-pull-resistant studs, common studs, prestressed steel bars and beam end steel plates, the prestressed steel bars are arranged in the lower portion of the cast-in-place concrete section to strengthen connection, a support is arranged below the cast-in-place concrete section and supported on continuous piers, the cast-in-place reinforced concrete slab is provided with internally prestressed tendons in negative bending moment areas, and the prestressed tendons in the negative bending moment areas and the prefabricated composite box beams form a simply supported-continuous steel- concrete composite box beam.

2. The simply supported-continuous steel-concrete composite box beam part shear- resistant and non-pull-resistant connecting piece structure according to claim 1, wherein the shear-resistant and non-pull-resistant studs are arranged at the upper 65% part of the heights of the front end and the rear end of the cast-in-place concrete section, and the common studs are arranged at the lower 35% part of the heights of the lower portions of the front end and the rear end of the cast-in-place concrete section.

3. The simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure according to claim 1, wherein the shear-resistant and non-pull-resistant stud is composed of a round steel rod and a steel sleeve, the round steel rod is made of a plain round steel rod, the steel sleeve is formed by welding a round steel pipe and a steel end plate, and lubricating oil is coated inside the steel sleeve.

4. The simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure according to claim 1, wherein the prestressed steel bar is a high-strength steel bar, the prestressed steel bar is anchored to the beam end steel plates at the two ends, one end of the prestressed steel bar is fixedly connected, the other end of the prestressed steel bar is tensioned, and the tensioned end can be tensioned for multiple times.

5. The simply supported-continuous steel-concrete composite box beam partly shear-resistant and non-pull-resistant connecting piece structure according to claim 1, wherein studs are arranged in the beam end steel plates, vertical stiffening ribs are arranged in the middle of the beam end steel plates, a top steel supporting plate is arranged in the upper portions of the beam end steel plates, studs are arranged on the top steel supporting plate, and the beam end steel plates and the steel beams are welded through butt welding seams.

7

BL-5349

6. The simply supported-continuous steel-concrete composite box beam partly LU501216 shear-resistant and non-pull-resistant connecting piece structure according to claim 1, wherein a leveling steel plate of the support is buried in the cast-in-place concrete section, after the support is installed, the cast-in-place concrete section and the cast-in-place reinforced concrete bridge deck slab can be poured at a time, and the length of the cast- in-place concrete section in the longitudinal bridge direction is not smaller than the length required by installation of the support.

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