CN218813196U

CN218813196U - Cast-in-place continuous box girder formwork of variable cross section on water

Info

Publication number: CN218813196U
Application number: CN202222589553.8U
Authority: CN
Inventors: 杜海洋; 刘东锋; 李坚; 袁启东; 陈子春
Original assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Current assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-04-07
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses a cast-in-place continuous box girder formwork of variable cross section on water relates to bridge construction technical field, including the steel pipe stand, steel pipe stand top be provided with the opening, the opening part be provided with the crossbeam, still including setting up vertical bailey roof beam and the slant bailey roof beam on the crossbeam, vertical bailey roof beam level place and correspond with the equal thickness section of case roof beam height, slant bailey roof beam slope sets up and corresponds with case roof beam circular arc section, and is adjacent vertical bailey roof beam with staggered arrangement between the slant bailey roof beam vertical bailey roof beam with square timber laminating beam base is linear has been arranged on the slant bailey roof beam. Compared with the prior art, the method solves the problem that the variable-cross-section bridge on the water with ultra-low clearance cannot be used for building a slope-adjusting steel pipe support, and realizes the variable-cross-section arc line shape of the cast-in-place continuous beam by adopting measures such as Bailey beam inclined placement and arc square timber, so that the purposes of attractive appearance, excellent quality, economy, reasonableness and the like are achieved.

Description

Cast-in-place continuous box girder formwork of variable cross section on water

Technical Field

The utility model relates to a bridge construction technical field specifically, relates to a continuous roof beam formwork of variable cross section cast in situ.

Background

The overwater variable cross-section cast-in-place continuous beam is generally constructed by adopting temporary structures such as a steel pipe pile, a Bailey beam, a full steel pipe bracket and the like, and the variable cross-section line shape is realized by the steel pipe bracket with variable height. The traditional temporary structure has the defects of large workload of erection and removal, long construction period and the like. When the height between the bottom of the bridge and the water surface is small, the erection height of the formwork support is limited, and the condition of erecting a steel pipe support is not provided, so that great difficulty is brought to the construction of the variable-section cast-in-place continuous beam on the water.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to not enough among the prior art, provide a cast-in-place continuous box girder formwork of variable cross section on water, through taking measures such as bailey roof beam slant and circular arc square timber, realize that the variable cross section circular arc of cast in situ continuous roof beam is linear to reach purposes such as the outward appearance is graceful, of high quality, economical rationality. The problem that a slope-adjusting steel pipe support cannot be erected on an ultra-low clearance overwater variable-section bridge is solved.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve: the utility model provides a cast-in-place continuous case roof beam formwork in variable cross section on water, includes the steel pipe stand, steel pipe stand top be provided with the opening, the opening part be provided with the crossbeam, still including setting up vertical bailey roof beam and the slant bailey roof beam on the crossbeam, vertical bailey roof beam level place and correspond with case roof beam height uniform thickness section, slant bailey roof beam slope sets up and corresponds with case roof beam circular arc section, and is adjacent vertical bailey roof beam with staggered arrangement between the slant bailey roof beam vertical bailey roof beam with square timber laminating roof beam bottom is linear has been arranged on the slant bailey roof beam.

Preferably, the longitudinal beret beams and the oblique beret beams are uniformly provided with I-shaped distribution beams at intervals, and the square timber is arranged on the I-shaped distribution beams.

In the technical method, preferably, the bottom template is arranged on the square timber, and the height of the bottom template is adjusted through the square timber.

In the technical method, preferably, the longitudinal beret beam and the oblique beret beam are connected and reinforced through channel steel.

In the above technical method, preferably, a wedge block is disposed between the oblique beret beam and the cross beam.

In the above technical method, preferably, a U-shaped clip is further disposed between the longitudinal beret beam and the oblique beret beam and the cross beam.

In the technical method, preferably, a plurality of reinforcing brackets are arranged in the longitudinal Bailey beam.

In the technical method, preferably, a plurality of reinforcing brackets are arranged in the oblique bailey beam.

The steel tube beam mainly comprises steel tube stand columns, cross beams, longitudinal Bailey beams, oblique Bailey beams, I-shaped distribution beams, square timbers, bottom formwork and the like. The steel pipe stand column can sink to the bottom of a river bed or be supported on a bridge bearing platform, the top of the steel pipe stand column is provided with an opening, and an I-shaped steel cross beam is placed on the opening, so that the height of the formwork support is reduced, and the displacement of a main beam can be limited. The high thick section of roof beam height sets up vertical beiLei roof beam, and vertical beiLei roof beam is as the bearing girder, and the circular arc section sets up slant beiLei roof beam, and wherein the slant beiLei roof beam slant is placed, does not establish the pin between the adjacent beiLei roof beam of striding, and the cross bridge is to the staggered arrangement to satisfy different span construction demands. And square timbers are arranged on the I-shaped distribution beam so as to adjust the beam bottom line shape. The oblique placement of the oblique bailey beam with the arc section can lead to a wedge-shaped gap between the bottom of the oblique bailey beam and the main beam, so that a steel wedge block is adopted for compaction, and the damage caused by the local stress of the upper flange of the main beam of the profile steel is avoided. The oblique bailey beams of the circular arc section and the longitudinal bailey beams of the horizontal section are crossed and cannot be provided with pins, so that the bailey beams are transversely connected and reinforced by channel steel, the overall stability is improved, the bailey beams are obliquely placed and transversely staggered in the circular arc section, and the bottom line shape of the beam is adjusted by a method of paving the arc square beams on the arc section. The opening is established at the steel-pipe pile top, not only reduces formwork height, can restrict the displacement of I-steel girder moreover. The technical parameters of the formwork support such as material specification, length, arrangement spacing and the like are obtained through mechanical calculation.

Compared with the prior art, the method solves the problem that the variable-cross-section bridge on the water with ultra-low clearance cannot be used for building a slope-adjusting steel pipe support, and realizes the variable-cross-section arc line shape of the cast-in-place continuous beam by adopting measures such as Bailey beam inclined placement and arc square timber, so that the purposes of attractive appearance, excellent quality, economy, reasonableness and the like are achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be discussed below, it is obvious that the technical solutions described in conjunction with the drawings are only some embodiments of the present invention, and for those skilled in the art, other embodiments and drawings can be obtained according to the embodiments shown in the drawings without creative efforts.

Fig. 1 is a front schematic view of the present invention.

Fig. 2 is a schematic view of a portion of fig. 1-a in an enlarged scale.

Fig. 3 is a schematic cross-sectional view of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments described in the present disclosure, all other embodiments obtained by a person skilled in the art without creative efforts are within the scope of the present disclosure.

As shown in fig. 1 to 3, the overwater variable cross-section cast-in-situ continuous box girder formwork support comprises a steel pipe upright post 1, wherein an opening is formed in the top of the steel pipe upright post 1, a cross beam 2 is arranged at the opening, and the overall height of the formwork support can be adjusted through the opening depth. The transverse beam is characterized by further comprising a longitudinal Bailey beam 3 and an oblique Bailey beam 4 which are arranged on the transverse beam 2, wherein a plurality of reinforcing supports are arranged in the longitudinal Bailey beam, a plurality of reinforcing supports are arranged in the oblique Bailey beam, and the strength of the longitudinal Bailey beam and the strength of the oblique Bailey beam are improved through the reinforcing supports. And U-shaped clamps are further arranged between the longitudinal Bailey beam 3 and the oblique Bailey beam 4 and between the transverse beam 2, and the longitudinal Bailey beam 3 and the oblique Bailey beam 4 are fixed on the transverse beam 2 through the U-shaped clamps so as to prevent the longitudinal Bailey beam 3 and the oblique Bailey beam 4 from moving. The longitudinal Bailey beams 3 are horizontally arranged to correspond to the box girder high equal-thickness sections, the oblique Bailey beams 4 are obliquely arranged to correspond to the box girder circular arc sections, the longitudinal Bailey beams 3 and the oblique Bailey beams 4 are adjacent to each other and are arranged in a staggered mode, and the longitudinal Bailey beams 3 and the oblique Bailey beams 4 are connected and reinforced through channel steel. And the reinforcement is that channel steel is welded on the longitudinal Bailey beam 3 and the oblique Bailey beam 4. The longitudinal Bailey beams and the oblique Bailey beams are uniformly provided with I-shaped distribution beams at intervals, and the square timber is arranged on the I-shaped distribution beams or directly arranged on the longitudinal Bailey beams and the oblique Bailey beams. And a wedge block is arranged between the oblique Bailey beam and the cross beam, and is welded with the oblique Bailey beam and the cross beam.

The specific construction method comprises the following steps: and calculating the total height of the erected formwork support according to the elevation of the water surface and the elevation of the beam bottom. And then determining technical parameters such as the arrangement span of the formwork support, material specification, space, pile length and the like through mechanical calculation. Manufacturing and welding the steel pipe upright post to lengthen, and sinking to a designed elevation by a vibration method; the steel pipe upright columns on the bridge bearing platform are placed during the construction of the bearing platform and are welded and fixed with the embedded parts; and strictly controlling the verticality in the steel pipe pile construction. The steel pipe stand is transversely connected with the channel steel, and the overall stability is enhanced. A transverse I-shaped steel girder, namely a cross beam, is arranged at the top of the steel tube stand column, a steel plate bearing is arranged below the cross beam, and the steel plate bearing is welded and fixed on the steel tube stand column.

The Bailey beams are placed, the longitudinal Bailey beams at the sections with high beam height and high thickness are horizontally placed, and the oblique Bailey beams at the arc sections are obliquely placed. The transverse bridge is arranged in a staggered mode when the oblique Bailey beam and the horizontal section Bailey beam are crossed, no pin is arranged, so that different span construction requirements are met, channel steel is adopted between the Bailey beams of the node transversely for connection and reinforcement, and the overall stability is improved. A gap exists at the bottom of the obliquely-placed Bailey beam, a steel wedge block is required to be used for compacting and welding, and meanwhile, the Bailey beam and an I-shaped steel main beam are welded by a U-shaped clamp to prevent the Bailey beam from shifting. And (4) placing an I-shaped distribution beam and fixing the I-shaped distribution beam with the Bailey beam. And placing square timbers and a bottom die. The high-thickness section of the beam adopts rectangular square timber, and the high-change section of the beam adopts arc square timber to adjust the shape of the bottom of the beam. And after the formwork support system is qualified, sequentially carrying out reinforcing steel bar, prestress and concrete construction. And (4) after the prestress of the bridge structure is established, sequentially dismantling the formwork support from top to bottom.

Claims

1. The utility model provides a cast-in-place continuous box girder formwork of variable cross section on water, includes the steel pipe stand, characterized in that, steel pipe stand top be provided with the opening, the opening part be provided with the crossbeam, still including setting up vertical bailey roof beam and the slant bailey roof beam on the crossbeam, vertical bailey roof beam level place and correspond with box girder beam height uniform thickness section, slant bailey roof beam slope sets up and corresponds with box girder circular arc section, and is adjacent vertical bailey roof beam with staggered arrangement between the slant bailey roof beam vertical bailey roof beam with square timber laminating roof beam bottom is linear has been arranged on the slant bailey roof beam.

2. The formwork support for the overwater variable-section cast-in-situ continuous box girder according to claim 1, wherein I-shaped distribution beams are uniformly arranged on the longitudinal Bailey beam and the oblique Bailey beam at intervals, and the square timber is arranged on the I-shaped distribution beams.

3. The formwork support of the above-water variable-section cast-in-situ continuous box girder according to claim 1, wherein a bottom formwork is arranged on the square timber and the height of the bottom formwork is adjusted through the square timber.

4. The formwork support of the above-water variable-section cast-in-place continuous box girder as claimed in claim 1, wherein the longitudinal Bailey beam and the oblique Bailey beam are connected and reinforced through channel steel.

5. The formwork support of the overwater variable cross-section cast-in-situ continuous box girder of claim 1, wherein a wedge-shaped block is arranged between the oblique Bailey girder and the cross beam.

6. The formwork support of the overwater variable cross-section cast-in-situ continuous box girder according to claim 1, wherein U-shaped clamps are further arranged between the longitudinal Bailey beam and the transverse beam and between the oblique Bailey beam and the transverse beam.

7. The formwork support of an overwater variable cross-section cast-in-situ continuous box girder according to claim 1, wherein a plurality of reinforcing supports are arranged in the longitudinal Bailey beam.

8. The formwork support of the overwater variable cross-section cast-in-situ continuous box girder according to claim 1, wherein a plurality of reinforcing supports are arranged in the oblique Bailey beam.