CN109610339B - Assembled type unbalanced load preventing pushing device for concrete continuous rigid frame bridge and construction method thereof - Google Patents
Assembled type unbalanced load preventing pushing device for concrete continuous rigid frame bridge and construction method thereof Download PDFInfo
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- CN109610339B CN109610339B CN201811645154.0A CN201811645154A CN109610339B CN 109610339 B CN109610339 B CN 109610339B CN 201811645154 A CN201811645154 A CN 201811645154A CN 109610339 B CN109610339 B CN 109610339B
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- 239000004567 concrete Substances 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 title claims description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000007906 compression Methods 0.000 claims description 32
- 230000006835 compression Effects 0.000 claims description 31
- 239000003381 stabilizer Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 239000011513 prestressed concrete Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an assembled anti-unbalanced load pushing device of a concrete continuous rigid frame bridge, which comprises an embedded part, a force transmission rod piece and a power system; the embedded part comprises a web embedded part and a top plate embedded part; the power system comprises a jack, an oil pump and two bearing plates; the web embedded part and the top plate embedded part are embedded on two side beam bodies of the midspan of the continuous rigid frame bridge; the two bearing plates are oppositely arranged and are respectively connected with embedded parts on two side beam bodies of the midspan of the continuous rigid frame bridge through two sets of force transmission rod pieces, and the jack is arranged between the two bearing plates; the oil pump is started, the jack can synchronously apply jacking force to the L-shaped bearing plates at two sides, and the jacking force is uniformly applied to two sides of the folding opening through the force transmission rod piece. The pushing device can be repeatedly used, so that the synchronism of pushing force applied to the two side beam bodies of the mid-span is ensured, and the problem that the closure pushing is asynchronous and the structural stress is uneven at present is solved.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to an assembled type unbalanced load preventing pushing device for a concrete continuous rigid frame bridge and a construction method thereof.
Background
The prestressed concrete continuous rigid frame bridge structure has definite stress and smooth running, has larger spanning capacity and is very widely applied. The prestressed concrete continuous rigid frame bridge is a pier-beam consolidation system, belonging to a statically indeterminate structure. The factors such as prestress loss, concrete shrinkage creep, temperature change and the like can generate unfavorable additional internal force in the beam, so that the main pier generates deflection and midspan downwarping. This adverse phenomenon affects bridge ride comfort, structural safety, and life.
Before the midspan is folded, horizontal pushing force is applied to the main girder, so that the main pier generates pre-deflection, and the additional internal force can be effectively reduced. Therefore, the pushing is a common construction measure for improving the long-term acting effect and the temperature difference effect of the load. In the existing pushing construction, a plurality of internal or external stiffening frameworks are arranged on two sides of a folding opening, and a plurality of jacks are matched for pushing simultaneously. The pushing is difficult to realize synchronization, and the stress of the structure is easy to be uneven; and generally adopt welded connection, the installation and the dismantlement construction are complicated.
Disclosure of Invention
In order to solve the technical problems, the invention provides the assembled type unbalanced load preventing pushing device for the concrete continuous rigid frame bridge, which is simple and convenient to construct, high in working efficiency and even in stress, and the construction method of the assembled type unbalanced load preventing pushing device.
The technical scheme for solving the problems is as follows: the assembled unbalanced load preventing pushing device for the concrete continuous rigid frame bridge comprises an embedded part, a force transmission rod piece and a power system; the embedded part comprises a web embedded part and a top plate embedded part; the power system comprises a jack, an oil pump and two bearing plates; the web embedded part and the top plate embedded part are embedded on two side beam bodies of the midspan of the continuous rigid frame bridge; the two bearing plates are oppositely arranged and are respectively connected with embedded parts on two side beam bodies of the midspan of the continuous rigid frame bridge through two sets of force transmission rod pieces, and the jack is arranged between the two bearing plates.
The concrete continuous rigid frame bridge assembled type unbalanced load preventing pushing device comprises two web embedded parts and a top plate embedded part, wherein the web embedded parts are symmetrically arranged at neutral shafts at two sides of a beam body, and the top plate embedded part is arranged at the center line of the top of the beam body.
Above-mentioned continuous rigid frame bridge assembled anti-unbalanced load thrustor of concrete, the biography power member includes X shape depression bar and pull rod, the pull rod both ends are fixed respectively on two web built-in fittings, X shape depression bar is articulated by first body of rod and second body of rod and wholly is X shape, and first body of rod and second body of rod one end are installed respectively on two web built-in fittings, and first body of rod and second body of rod other end are connected with the bearing plate.
The assembled anti-unbalanced load pushing device of the concrete continuous rigid frame bridge comprises a force transmission rod piece, wherein the force transmission rod piece comprises a hinged point of the pressure rod and a top plate embedded part, a top plate embedded part and a first rod piece, a top plate embedded part and a second rod piece and an auxiliary stabilizing rod; the X-shaped compression bar is pressed during pushing operation, and the pushing force of the jack is uniformly transmitted to the beam body; the pull rod balances the component force of the X-shaped compression bar parallel to the cross section, and the auxiliary stabilizing bar bears tension/pressure to ensure the stability of the X-shaped compression bar.
Above-mentioned assembled unbalanced load thrustor of preventing of continuous rigid frame bridge of concrete, first body of rod, second body of rod, auxiliary stabilizer are rectangular hollow steel pipe, the pull rod is the smart thread reinforcing bar that pricks.
A construction method of an assembled anti-unbalanced load pushing device of a concrete continuous rigid frame bridge comprises the following steps:
(1) Embedding an embedded part: the continuous rigid frame bridge completes bridge pier construction, beam construction is carried out, when the continuous rigid frame bridge is constructed to the last cantilever section, two web embedded parts and a top plate embedded part are respectively embedded in two beam bodies at two sides of a folding opening, wherein the two web embedded parts are embedded in neutral shafts at two sides of the beam bodies, 3m from the folding opening, and the top plate embedded parts are embedded in the middle line at the top of the beam body;
(2) And (3) installing a force transmission rod piece: connecting two web embedded parts with two end points on one side of an X-shaped compression bar; a pull rod is arranged between the two web embedded parts; auxiliary stabilizing rods are arranged between the hinging point of the compression bar and the top plate embedded part, between the top plate embedded part and the first rod piece, between the top plate embedded part and the second rod piece and between the first rod piece and the second rod piece;
(3) And (3) installing a power system: the two L-shaped bearing plates are respectively connected with two end points on the other sides of the two X-shaped compression bars, and the jack is arranged between the two L-shaped bearing plates;
(4) Pushing and controlling: firstly, pre-jacking is carried out by 25% of a jacking force design value so as to eliminate gaps at all joints, the working state of each rod piece is checked, and then unloading is carried out;
(5) If the pre-jacking is abnormal, gradually pushing the pre-jacking to the designed jacking force according to the 25% load level; structural displacement and stress observation are carried out simultaneously in the pushing process;
(6) And (3) pushing construction is completed: locking the stiff framework and tensioning the temporary bundles; and (5) carrying out stage unloading by the jack, and removing the connecting rods and the plate.
The invention has the beneficial effects that:
1. the invention adopts the effective coordination of the single-point power system and the assembled truss to realize the unbalanced load prevention pushing of the large-span prestressed concrete box girder bridge. When the power system pushes, load is symmetrically transmitted to two sides of the beam body through the X-shaped compression bar. The X-shaped compression bar is subjected to larger pressure and easy to be unstable, and the problem that the X-shaped compression bar is increased in cross section and an auxiliary stabilizer bar is arranged is solved. The X-shaped compression bar can generate thrust pointing to the outer side of the web plate at the embedded part of the web plate and is balanced through the pull rod. Therefore, the whole pushing system forms a simple single-top pushing symmetrical stress system. The single point stress of the power system ensures that the stress area of the structure is simple and the control is convenient, and the problem of asynchronous stress caused by multi-jack pushing can not occur in the loading and unloading stages. The jacking force is symmetrically transferred to the beam web through symmetrically arranged assembly type trusses, and acts on the neutral axis of the cross section, so that the beam body cannot twist. The force transmission rod piece is supported by the auxiliary rod piece, so that instability can be avoided. The invention solves the construction problems of asynchronous closure pushing and uneven structural stress in the prior art.
2. In the pushing device, the X-shaped compression bar is a main stressed rod piece and is easy to unstably bear pressure during pushing, so that a hollow rectangular section is adopted to develop the section; and meanwhile, the auxiliary stabilizer bar is connected with the top plate embedded part, so that the stability of the X-shaped compression bar is enhanced through the two measures.
3. In the pushing device, the connecting point of the X-shaped compression bar and the web embedded part has larger component force perpendicular to the web, and the two nodes are oppositely pulled by adopting a pull rod to balance the component force. Because the pull rod does not have the stability problem, the pull rod adopts high-strength precision binding screw steel to lighten the dead weight of the structure.
Drawings
Fig. 1 is a schematic diagram of a continuous rigid frame bridge pushing in a mid-span closure link.
FIG. 2 is a top view of the pusher of the present invention.
FIG. 3 is an enlarged view of the power system of the pushing device of the present invention.
FIG. 4 is a schematic view of section I-I of FIG. 2.
FIG. 5 is a schematic view of section II-II of FIG. 2.
FIG. 6 is a construction flow chart of the pushing device of the present invention.
In the figure: the bridge comprises a 1-bridge pier, a 2-beam body, a 3-folding opening, a 4-web embedded part, a 5-top plate embedded part, a 6-compression bar, a 7-pull bar, an 8-auxiliary stabilizer bar, a 9-bearing plate and a 10-jack.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 2, the assembled anti-unbalanced load pushing device of the concrete continuous rigid frame bridge comprises an embedded part, a force transmission rod piece and a power system.
The power system comprises a jack 10, an oil pump and two L-shaped bearing plates 9, wherein the two bearing plates 9 are oppositely arranged, the jack 10 is arranged between the two L-shaped bearing plates 9, and jacking force is exerted through the oil pump; the two L-shaped bearing plates 9 are respectively connected with embedded parts on two side beam bodies of the midspan of the continuous rigid frame bridge through two sets of force transmission rods.
As shown in fig. 2, 4 and 5, the embedded parts comprise two web embedded parts 4 and a top plate embedded part 5, the two web embedded parts 4 are symmetrically and fixedly arranged at neutral shafts at two side parts of the beam body 2, and the top plate embedded part 5 is fixedly arranged at the middle line of the top of the beam body 2.
As shown in fig. 2-5, the force transmission rod piece comprises a compression rod 6, a tension rod 7 and an auxiliary stabilizer 8, two ends of the tension rod 7 are respectively fixed on the two web embedded pieces 4, the compression rod 6 is formed by hinging a first rod body and a second rod body in an overall X shape, one ends of the first rod body and the second rod body are respectively installed on the two web embedded pieces 4, the other ends of the first rod body and the second rod body are connected with a bearing plate 9, and the auxiliary stabilizer 8 is respectively arranged between the hinging point of the compression rod 6 and the top plate embedded piece 5, between the top plate embedded piece 5 and the first rod piece, between the top plate embedded piece 5 and the second rod piece and between the first rod piece and the second rod piece. The first rod body, the second rod body and the auxiliary stabilizer rod 8 are rectangular hollow steel pipes, and the pull rod 7 is a fine-tied twisted steel bar.
The working principle of the invention is as follows: the jack 10 is arranged between the two L-shaped bearing plates 9, the two L-shaped bearing plates 9 are connected with the embedded part arranged on the beam body 2 through the force transmission rod piece, the oil pump is started during construction, the jack 10 can synchronously apply the jacking force to the bearing plates 9 on the two sides, and the jacking force is transmitted to the beam bodies 2 on the two sides of the midspan through the force transmission rod piece, so that the synchronism of the jacking force applied to the two side beam bodies 2 of the midspan is ensured, the construction problems of unsynchronized closure pushing and uneven structural stress at present are solved, and the jack has good application prospect.
As shown in fig. 6, the construction flow of the present invention includes the steps of:
(1) Embedding an embedded part: the continuous rigid frame bridge completes the construction of the bridge pier 1, the construction of the beam bodies 2 is carried out, two web embedded parts 4 and a top plate embedded part 5 are respectively embedded in the two beam bodies 2 at the two sides of the folding opening 3, wherein the two web embedded parts 4 are embedded in web parts at the two sides of the beam bodies 2, and the distance between the web embedded parts 4 and the cantilever ends is 3m; the top plate embedded part 5 is embedded at the center line (namely the cantilever end part) of the top plate of the beam body 2.
(2) And (3) installing a force transmission rod piece: connecting two web embedded parts 4 on each beam body 2 with two end points on one side of an X-shaped compression bar 6 to form nodes (1) and (2), and arranging a pull rod 7 between the nodes (1) and (2); the hinge point of the X-shaped compression bar 6 is set as a node (3); the top plate embedded part 5 is set as a node (4); the nodes (3) and (4) are connected by an auxiliary stabilizer bar 8; and the cross section of the cantilever end is connected with two rod bodies of the X-shaped compression bar 6 and the top plate embedded part 5 by an auxiliary stabilizing bar 8 to form nodes (4), (5) and (6).
(3) And (3) installing a power system: two L-shaped bearing plates 9 are respectively connected with two end points on the other side of the two X-shaped compression bars 6 through bolts to form joints (7) and (8), and a jack 10 is arranged between the two L-shaped bearing plates 9.
(4) Pushing and controlling: firstly, pre-jacking is carried out by 25% of a jacking force design value so as to eliminate gaps at all joints, and the working state of each rod piece is checked, and then unloading is carried out.
(5) If the pre-jacking is free from abnormality, the pre-jacking can be gradually pushed to the designed jacking force according to the load level of 25 percent. And (3) observing structural displacement and stress simultaneously in the pushing process.
(6) And (3) pushing construction is completed: locking the stiff framework and tensioning the temporary bundles; and (5) carrying out stage unloading by the jack, and removing the connecting rods and the plate.
Claims (4)
1. A construction method of an assembled anti-unbalanced load pushing device of a concrete continuous rigid frame bridge comprises the following steps:
(1) Embedding an embedded part: the continuous rigid frame bridge completes bridge pier construction, beam construction is carried out, when the continuous rigid frame bridge is constructed to the last cantilever section, two web embedded parts and a top plate embedded part are respectively embedded in two beam bodies at two sides of a folding opening, wherein the two web embedded parts are embedded in neutral shafts at two sides of the beam bodies, 3m from the folding opening, and the top plate embedded parts are embedded in the middle line at the top of the beam body;
(2) And (3) installing a force transmission rod piece: connecting two web embedded parts with two end points on one side of an X-shaped compression bar; a pull rod is arranged between the two web embedded parts; auxiliary stabilizing rods are arranged between the hinging point of the compression bar and the top plate embedded part, between the top plate embedded part and the first rod piece, between the top plate embedded part and the second rod piece and between the first rod piece and the second rod piece;
(3) And (3) installing a power system: the two L-shaped bearing plates are respectively connected with two end points on the other sides of the two X-shaped compression bars, and the jack is arranged between the two L-shaped bearing plates;
(4) Pushing and controlling: firstly, pre-jacking is carried out by 25% of a jacking force design value so as to eliminate gaps at all joints, the working state of each rod piece is checked, and then unloading is carried out;
(5) If the pre-jacking is abnormal, gradually pushing the pre-jacking to the designed jacking force according to the 25% load level; structural displacement and stress observation are carried out simultaneously in the pushing process;
(6) And (3) pushing construction is completed: locking the stiff framework and tensioning the temporary bundles; and (5) carrying out stage unloading by the jack, and removing the connecting rods and the plate.
2. The construction method of the concrete continuous rigid frame bridge assembled type unbalanced load prevention pushing device, which is characterized by comprising the following steps of: the concrete continuous rigid frame bridge assembled type unbalanced load preventing pushing device comprises an embedded part, a force transmission rod piece and a power system; the embedded part comprises a web embedded part and a top plate embedded part; the power system comprises a jack, an oil pump and two bearing plates; the web embedded part and the top plate embedded part are embedded on two side beam bodies of the midspan of the continuous rigid frame bridge; the two bearing plates are oppositely arranged and are respectively connected with embedded parts on two side beam bodies of the midspan of the continuous rigid frame bridge through two sets of force transmission rod pieces, and the jack is arranged between the two bearing plates;
the embedded parts comprise two web embedded parts and a top plate embedded part, the web embedded parts are symmetrically arranged at neutral shafts at two sides of the beam body, and the top plate embedded parts are arranged at the middle line of the top of the beam body;
the force transmission rod piece comprises an X-shaped compression rod and a pull rod, two ends of the pull rod are respectively fixed on the two web embedded pieces, the X-shaped compression rod is formed by hinging a first rod body and a second rod body and is integrally X-shaped, one ends of the first rod body and the second rod body are respectively installed on the two web embedded pieces, and the other ends of the first rod body and the second rod body are connected with the bearing plate;
when the power system pushes, load is symmetrically transmitted to two sides of the beam body through the X-shaped compression bars, the X-shaped compression bars generate thrust pointing to the outer side of the web plate at the embedded part of the web plate, and the thrust is balanced through the pull bars, so that the whole pushing system forms a single-pushing symmetrical stress system.
3. The construction method of the concrete continuous rigid frame bridge assembled type unbalanced load prevention pushing device, which is characterized by comprising the following steps of: the force transmission rod piece further comprises an auxiliary stabilizer rod, wherein the auxiliary stabilizer rod is arranged between the hinging point of the compression rod and the top plate embedded part, between the top plate embedded part and the first rod piece, between the top plate embedded part and the second rod piece and between the first rod piece and the second rod piece; the X-shaped compression bar is pressed during pushing operation, and the pushing force of the jack is uniformly transmitted to the beam body; the pull rod balances the component force of the X-shaped compression bar parallel to the cross section, and the auxiliary stabilizing bar bears tension/pressure to ensure the stability of the X-shaped compression bar.
4. The construction method of the concrete continuous rigid frame bridge assembled type unbalanced load prevention pushing device, which is characterized by comprising the following steps of: the first rod body, the second rod body and the auxiliary stabilizer are rectangular hollow steel pipes, and the pull rod is a fine-rolled screw thread steel bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811645154.0A CN109610339B (en) | 2018-12-29 | 2018-12-29 | Assembled type unbalanced load preventing pushing device for concrete continuous rigid frame bridge and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811645154.0A CN109610339B (en) | 2018-12-29 | 2018-12-29 | Assembled type unbalanced load preventing pushing device for concrete continuous rigid frame bridge and construction method thereof |
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| CN109610339B true CN109610339B (en) | 2024-02-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110644367A (en) * | 2019-09-19 | 2020-01-03 | 中铁大桥科学研究院有限公司 | Closure method and closure system for steel box girder of cable-stayed bridge |
| CN112632737B (en) * | 2019-09-23 | 2024-02-20 | 华龙国际核电技术有限公司 | Method and device for determining neutral axis of embedded part |
| CN112391950B (en) * | 2020-10-14 | 2021-10-26 | 华南理工大学 | Device and method for adjusting center line deviation of closure opening of high-tower and low-tower cable-stayed bridge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB808977A (en) * | 1955-11-10 | 1959-02-18 | Stephen Revesz | Method of connecting structural concrete members |
| CN202323782U (en) * | 2011-11-24 | 2012-07-11 | 中铁二十三局集团有限公司 | Bridge supporting device for mid-span closure sections |
| CN204855267U (en) * | 2015-08-26 | 2015-12-09 | 西安公路研究院 | Overpass steel guardrail is anti to be pushed away rigidity test and uses horizontal loading device |
| CN209538039U (en) * | 2018-12-29 | 2019-10-25 | 湖南科技大学 | One kind closing up thrustor for prestressed concrete continuous rigid-framed bridge |
-
2018
- 2018-12-29 CN CN201811645154.0A patent/CN109610339B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB808977A (en) * | 1955-11-10 | 1959-02-18 | Stephen Revesz | Method of connecting structural concrete members |
| CN202323782U (en) * | 2011-11-24 | 2012-07-11 | 中铁二十三局集团有限公司 | Bridge supporting device for mid-span closure sections |
| CN204855267U (en) * | 2015-08-26 | 2015-12-09 | 西安公路研究院 | Overpass steel guardrail is anti to be pushed away rigidity test and uses horizontal loading device |
| CN209538039U (en) * | 2018-12-29 | 2019-10-25 | 湖南科技大学 | One kind closing up thrustor for prestressed concrete continuous rigid-framed bridge |
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