CN211472128U - Continuity combination beam - Google Patents
Continuity combination beam Download PDFInfo
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- CN211472128U CN211472128U CN201921736089.2U CN201921736089U CN211472128U CN 211472128 U CN211472128 U CN 211472128U CN 201921736089 U CN201921736089 U CN 201921736089U CN 211472128 U CN211472128 U CN 211472128U
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Abstract
The utility model belongs to the technical field of bridge engineering, concretely relates to continuity combination beam construction method. The problems of large bridge internal stress, easy crack generation and short service life in the prior art are solved, and the technical scheme is as follows: including the prefabricated bridge piece of several, the prefabricated bridge piece of several connects gradually, is provided with the prestressing tendons in the prefabricated bridge piece, the prestressing tendons stretches out prefabricated bridge piece's cross-section 35 ~ 45cm, the prestressing tendons is connected with the prestressing tendons one-to-one of adjacent prefabricated bridge piece. The utility model discloses divide into a plurality of sections with the prestressing force of a span beam, seam crossing does not receive the prestressing force influence, and the probability greatly reduced that the crack produced, the crack can not develop to adjacent prefabricated bridge piece yet moreover, and the life of bridge increases. The utility model is suitable for a require the construction of higher bridge to traffic or time limit for a project.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, concretely relates to continuity combination beam.
Background
A continuous beam is a beam having three or more supports in construction, aviation, and pipeline work. Along with the rapid construction of highways and high-speed railways, a plurality of long-span continuous beam bridges appear, the commonly adopted construction modes are all hanging baskets, full framing scaffolds and the like, the construction process is complex in process, the site is required to be subjected to comprehensive pouring construction, the progress is slow, the time is long, and the construction method often becomes a limit opening of the progress of the whole project.
The domestic bridge construction is a concrete reinforcement prestressed bridge, and construction technologies such as hanging basket type construction, full framing scaffold and the like are mostly adopted in construction. The construction technology is common bridge construction at present, can ensure the stability of a bridge structure, and has few conditions such as cracks after the construction is finished, so the construction technology is applied at present in China. However, this construction technique also has many disadvantages. Such as: long construction time, too high machine frequency, short service life, heavy workload of constructors, etc.
The prefabrication and assembly method is characterized in that a large amount of concrete is poured in a beam prefabrication field for industrial manufacture, assembly is carried out in an engineering field to achieve the required prestress and internal structure, a small amount of concrete is poured, and the whole continuous beam is formed. Can put the main part engineering of whole continuous beam to the precast yard go on, reduce the field work volume, can be with variable cross section's precision control to higher level, not only can improve the quality, the time that simultaneously can significantly reduce the construction for the construction progress has also saved a large amount of engineering expenses.
However, most of the existing continuous beam prefabrication and assembly construction is to apply prestress between a prefabricated bridge piece and an assembled bridge during assembly, the length of prestress application is increased along with the increase of the number of the prefabricated bridge pieces, and finally, prestress is applied to the whole span beam.
SUMMERY OF THE UTILITY MODEL
Big to bridge internal stress among the prior art, the easy crack that produces, problem that life is low, the utility model provides a continuity composite beam, its aim at: the stress in the bridge is divided into a plurality of sections, the stress of each section is not communicated, the development of cracks is prevented, and the service life of the bridge is prolonged.
The utility model adopts the technical scheme as follows:
the utility model provides a continuity combination beam, includes the prefabricated bridge piece of several, the prefabricated bridge piece of several connects gradually, be provided with the prestressing tendons in the prefabricated bridge piece, the prestressing tendons stretches out the cross-section 35 ~ 45cm of prefabricated bridge piece, the prestressing tendons is connected with the prestressing tendons one-to-one of adjacent prefabricated bridge piece, is provided with the transverse reinforcement on the prestressing tendons, concrete connecting portion have been pour in the outside of prestressing tendons and transverse reinforcement, the cross-sectional dimension of concrete connecting portion is the same with the cross-sectional dimension of prefabricated bridge piece.
In the prior art, the construction of a prefabricated assembly method generally comprises the steps of prefabricating a bridge piece, but prestress is not applied during prefabrication, a prestressed tendon channel is reserved in the prefabricated bridge piece, after the prefabricated bridge piece is hoisted in place, a prestressed tendon penetrates into the reserved channel to be tensioned, the joint is processed, the assembly of a section of prefabricated bridge piece is completed, and the operation is repeated, so that the installation of a span beam is completed. The method can ensure that continuous prestress exists in a span beam, the joints of the prefabricated bridge pieces become weak points and are easy to fracture, and the cracks can develop quickly and towards the adjacent prefabricated bridge pieces under the action of the prestress.
After the technical scheme is adopted, only prestress is applied to each prefabricated bridge piece, the joint between the prefabricated bridge pieces is free of prestress, the prestress of a span beam is divided into a plurality of sections, the joint is not affected by the prestress, the probability of crack generation is greatly reduced, the crack cannot be developed to the adjacent prefabricated bridge pieces, and the service life of the bridge is prolonged. And the scheme greatly shortens the construction time of the bridge, improves the engineering efficiency and reduces the adverse effect of the construction engineering on traffic.
Preferably, the upper portion of prefabricated bridge piece is provided with two layers of prestressing tendons, and wherein the prestressing tendons of lower floor set up to the arc and kickup.
After the technical scheme is adopted, the stress of the arc-shaped steel bar connection mode in the thickness direction and the horizontal direction is uniform, the influence of the arc-shaped steel bar connection mode on the prefabricated bridge pieces on the two sides of the arc-shaped steel bar connection mode is smaller, and the prefabricated bridge pieces are not easy to crack.
Preferably, the transverse steel bars on the upper part are connected by welding, and the transverse steel bars on the lower part are connected by binding.
After the technical scheme is adopted, welding construction personnel on the upper portion can directly operate on the bridge deck, and binding construction personnel on the lower portion can operate on the box girder cavity and the template, so that construction is facilitated.
Preferably, the cross section of the prefabricated bridge piece is provided with an adhesive, and the thickness of the adhesive is 0.5-1 mm.
The solvent volatilization speed is too slow and the strength is increased slowly due to the fact that the binder is coated too thickly, the binder only plays a role in filling at the moment, the bonding force is not strong, and if the binder is coated too thinly, glue shortage is easily caused, and the bonding area is reduced. After adopting this technical scheme, the moisture in the binder volatilizes more easily, and the intensity of binder increases more fast, avoids causing the condition of starving simultaneously. The binder can make and be connected inseparabler between the concrete of newly pouring and the prefabricated bridge piece, avoids binder and concrete junction to become the weak department of bridge atress, causes stress concentration, avoids the crack to produce in binder and concrete junction, increases the stability and the bearing capacity of bridge.
Preferably, the distance between the prestressed tendons is 35-45 cm.
After adopting this technical scheme, guarantee that prefabricated bridge piece inside has sufficient prestressing force, constructor when the welding construction, the welding tool can have operating space, the construction of being convenient for simultaneously.
Preferably, the prestressed tendons are connected with the prestressed tendons of the adjacent prefabricated bridge pieces in a welding mode, and the welded lap joint length is not less than 10 times of the diameter of the prestressed tendons.
After the technical scheme is adopted, the lap joint strength of the lap joint between the prestressed tendons can meet the standard requirement, and the bending resistance, the shearing resistance and the bearing capacity of the bridge can meet the requirement.
The utility model discloses a construction method of continuity combination beam includes following step:
step [1 ]: manufacturing a prefabricated bridge piece;
step [2 ]: building supports, wherein the distance between the supports is larger than the width of a pier and the span of a bridge;
step [3 ]: the two sides of the bridge pier are respectively provided with a cross beam, and the cross beams are arranged on the support;
step [4 ]: the method comprises the following steps that hoisting equipment is installed on a cross beam, and the number of the hoisting equipment is the same as that of prefabricated bridge pieces in a span;
step [5 ]: hoisting the prefabricated bridge pieces, namely hoisting the prefabricated bridge pieces on the bridge piers, and then hoisting the prefabricated bridge pieces in the bridge span at the same time;
step [6 ]: connecting the steel bars at the joints of the adjacent prefabricated bridge pieces;
step [7 ]: and pouring concrete at the joint of the prefabricated bridge piece.
And (2) performing pre-tensioning prestressed construction on the prefabricated bridge piece in the step (1), and reserving 35-45 cm prestressed tendons at two sides respectively.
Before the support is built in the step (2), firstly, excavating at the position where the support is built, and then pouring concrete to be used as a support foundation. The foundation of the support is more stable, and quality accidents or safety accidents caused by support foundation settlement in the construction process are prevented.
And (5) the hoisting equipment in the step (4) is a gantry crane, and the gantry crane is connected with the beam in a sliding manner. The gantry crane can move, so that the prefabricated bridge piece can move and be in place in the hoisting process.
And (5) between the steps (6) and (7), coating the adhesive on the section of the prefabricated bridge piece, removing loose concrete on the section of the prefabricated bridge piece before coating the adhesive, removing impurities and drying the concrete on the section of the prefabricated bridge piece. The bonding between the bonding agent and the concrete is firmer, the bearing capacity and the stability of the structure are improved, and the generation of cracks is avoided.
The thickness of the binder is controlled between 0.5mm and 1mm, and the bonding strength between the binder and the concrete is greater than that of the concrete. The method can avoid the phenomenon that the joint of the adhesive and the concrete becomes a weak part of the stress of the bridge, so that stress concentration is caused, cracks can be prevented from being generated at the joint of the adhesive and the concrete, and the stability and the bearing capacity of the bridge are improved.
After applying an adhesive to the cross-section of the precast bridge panel, a pressure of 0.2Mpa was applied to the adhesive for 2 hours. After the technical scheme is adopted, the bonding agent and the concrete surface are combined more tightly, and the bonding strength is higher.
Before the adhesive is not solidified, maintaining a compressive stress at the joint, wherein the compressive stress is not less than 0.3 MPa.
After the technical scheme is adopted, certain prestress can be ensured at the joint of the prefabricated bridge pieces, so that the bearing capacity of the bridge is higher.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the construction time of the bridge is greatly shortened, the engineering efficiency is improved, the adverse effect of construction engineering on traffic is reduced, and compared with the existing integral prestress distribution, the segmented prestress distribution can reduce cracks of the bridge, the cracks generated at the joint are fewer, and the service life of the bridge is prolonged.
2. The upper portion of prefabricated bridge piece is provided with two-layer prestressing tendons, and wherein the prestressing tendon of lower floor sets up to arc and kickup, and the arc steel bar connected mode atress is all more even in thickness direction and horizontal direction, and the influence of arc steel bar connected mode to the prefabricated bridge piece of its both sides is littleer, and the prefabricated bridge piece is more difficult for producing the crack.
3. The transverse steel bars on the upper portion are connected in a welded mode, the transverse steel bars on the lower portion are connected in a binding mode, welding construction personnel on the upper portion can operate on the bridge floor directly, and binding construction personnel on the lower portion can operate on the box girder cavity and the template, so that construction is facilitated.
4. The cross-section of prefabricated bridge piece is provided with the binder, and thickness is 0.5mm ~ 1mm, and the intensity of binder increases sooner, avoids causing the condition of starving simultaneously. The binder can make and be connected inseparabler between the concrete of newly pouring and the prefabricated bridge piece, avoids binder and concrete junction to become the weak department of bridge atress, causes stress concentration, avoids the crack to produce in binder and concrete junction, increases the stability and the bearing capacity of bridge.
5. The prestressed tendon interval is 35 ~ 45cm, guarantees that prefabricated bridge piece is inside to have sufficient prestressing force, and constructor when the welding construction, welding tool can have operating space, the construction of being convenient for simultaneously.
6. The lapping length is not less than 10 times of the diameter of the prestressed tendons, the lapping strength of the lapping part between the prestressed tendons is ensured to meet the standard requirement, and the bending resistance, the shearing resistance and the bearing capacity of the bridge are ensured to meet the requirement.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a bridge structure according to the first embodiment;
FIG. 2 is a schematic structural view of a No. one prefabricated bridge piece;
FIG. 3 is a schematic structural view of No. 2 prefabricated bridge piece;
FIG. 4 is a schematic structural view of a No. three prefabricated bridge piece;
FIG. 5 is a schematic view of a gantry crane and a gantry crane;
fig. 6 is a layout view of reinforcing bars at a joint.
The bridge comprises 1-firstly prefabricated bridge pieces, 2-secondly prefabricated bridge pieces, 3-thirdly prefabricated bridge pieces, 4-piers, 5-supports, 6-auxiliary supports, 7-crossbeams, 8-gantry cranes, 9-bridge decks, 10-prestressed tendons, 11-arc-shaped reinforcing steel bars and 12-transverse reinforcing steel bars.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1 to 6.
The utility model provides a continuity combination beam, includes the prefabricated bridge piece of several, the prefabricated bridge piece of several connects gradually, be provided with prestressing tendons 10 in the prefabricated bridge piece, prestressing tendons 10 stretches out the cross-section 35 ~ 45cm of prefabricated bridge piece, prestressing tendons 10 is connected with the prestressing tendons 10 one-to-one of adjacent prefabricated bridge piece, is provided with transverse reinforcement 12 on prestressing tendons 10, concrete connecting portion have been pour in prestressing tendons 10 and transverse reinforcement 12's the outside, the cross sectional dimension of concrete connecting portion is the same with the cross sectional dimension of prefabricated bridge piece.
The upper portion of prefabricated bridge piece is provided with two-layer prestressing tendons 10, and wherein the prestressing tendons 10 of lower floor set up to the arc and kickup.
The upper transverse steel bars 12 are connected by welding, and the lower transverse steel bars 12 are connected by binding.
The cross section of the prefabricated bridge piece is provided with a binder, and the thickness of the binder is 0.5-1 mm.
The distance between the prestressed tendons 10 is 35-45 cm.
The prestressed tendons 10 are connected with the prestressed tendons 10 of the adjacent prefabricated bridge pieces in a welding mode, and the welded lap joint length is not less than 10 times of the diameter of the prestressed tendons 10.
The utility model discloses construction method of continuity combination beam includes following step:
the method comprises the following steps:
step [1 ]: and manufacturing a prefabricated bridge piece. In the embodiment, the three specifications of the prefabricated bridge pieces are arranged, namely the first prefabricated bridge piece 1, the second prefabricated bridge piece 2 and the third prefabricated bridge piece 3, and the sizes of the prefabricated bridge pieces are set according to the concrete conditions of the bridge. The concrete pouring process is arranged in a beam prefabrication field for industrial manufacture, and the prefabricated bridge piece is constructed by using a pretensioning method. In this embodiment, the diameter of the steel bar of the precast bridge piece is 20cm, 35 cm's prestressing tendons 10 are reserved on the left and right sides, the reserved prestressing tendons 10 are straightened by the steel bar straightener, and 30 cm-40 cm's prestressing tendons are reserved on both sides respectively. The prestressed tendons of the bridge deck part are arranged in two layers, wherein the prestressed tendons of the lower layer are arranged into an arc shape to form arc-shaped reinforcing steel bars 11.
Step [2 ]: and (5) building supports 5, wherein the distance between the supports 5 is greater than the width of the pier 4 and the span of the bridge. Before the support 5 is built, a foundation pit is firstly excavated at the position where the support is built, the depth of the foundation pit is determined after calculation according to the bearing capacity of the foundation, the plane size of the foundation pit is slightly larger than that of the support 5, and then concrete is poured in the foundation pit to serve as the foundation of the support 5. The erection of the support 5 is then started on the basis.
Step [3 ]: and cross beams 7 are arranged on the brackets 5 and connected by fasteners, and the cross beams 7 are parallel to each other and are positioned at two sides of the pier 4. For a bridge with a large span, an auxiliary support 6 is erected between the two supports 5 and used for supporting the middle of the cross beam 7, and before the auxiliary support 6 is erected, the foundation needs to be treated in the same way, so that the foundation of the auxiliary support 6 meets the requirement of bearing capacity. The bracket 5 and the auxiliary bracket 5 are connected by fasteners.
Step [4 ]: a gantry crane 8 is mounted on the beam, a track is arranged on the beam, and rollers are arranged at the bottom of the gantry crane 8 and matched with the track. In this embodiment, the gantry crane 8 is a three-group combined gantry crane, the rated load capacity of the gantry crane 8 is 200 tons, and two trolleys are arranged on the group of gantry cranes, wherein the rated load capacity of each trolley is 100 tons.
Step [5 ]: hoisting the prefabricated bridge pieces, firstly, using two gantry cranes 8 positioned on two sides to respectively hoist a No. 1 prefabricated bridge piece on a pier 4, after the No. 1 prefabricated bridge piece is stably installed, using three gantry cranes 8 to hoist two residual No. 2 prefabricated bridge pieces and one No. 3 prefabricated bridge piece simultaneously, enabling the No. 2 prefabricated bridge piece and the No. 3 prefabricated bridge piece to reach specified positions, then erecting a scaffold below the prefabricated bridge pieces, and laying a partition plate and a template on the scaffold to prepare for seam construction;
step [6 ]: connecting the steel bars at the joints of the adjacent prefabricated bridge pieces; in this embodiment, the width of the joint is set to 45cm, the overlapping length of the tendon 10 is 25cm, and electroslag welding is adopted. The prestressed tendons of the bridge deck are arranged into double layers, and the prestressed tendons of the lower layer are bent into arcs (namely arc-shaped reinforcing steel bars 11). Transverse reinforcing steel bars 12 are laid on the prestressed reinforcing steel bars 10 and the arc-shaped reinforcing steel bars 11. The joint adopts the methods of upper welding and lower binding, so that welding construction personnel at the upper part can directly perform on the bridge deck, and binding construction personnel at the lower part can perform operation on the box girder cavity and the template. For construction convenience, welding tool can have the space operation when making constructor construct, and the reinforcing bar arrangement interval of seam department is 40 centimetres, and is covered with the reinforcing bar with 40 centimetres interval in cross-section department, and two rows of reinforcing bars are put to upper portion distribution, and only weld the upper portion during the construction, and lower part only needs the ligature.
Step [7 ]: and (3) removing loose concrete at the section of the prefabricated bridge piece, removing impurities such as oil stain, dust and the like, then pouring concrete at the joint, and adopting a layering method for pouring during concrete pouring.
And (6) coating the adhesive on the section of the prefabricated bridge piece between the step (6) and the step (7). Clear away the not hard up concrete of prefabricated bridge piece cross-section department, impurity such as greasy dirt, dust and dry the concrete of prefabricated bridge piece cross-section department, then scribble the binder on the cross-section of prefabricated bridge piece, the binder that this embodiment adopted is the chemical concrete mixture that makes after epoxy adds the cement mixture, belongs to the binder commonly used among the prior art. The adhesive is uniformly coated, the thickness is controlled to be 0.5 mm-1 mm, and the adhesive strength between the adhesive and the concrete is greater than that of the concrete. In order to secure the adhesive on the cross section of the precast bridge panel, after the adhesive was applied, a pressure of 0.2Mpa was applied to the adhesive for 2 hours. Before the adhesive is solidified, a minimum temporary compressive stress is maintained at the joint, the compressive stress being not less than 0.3 Mpa. And then erecting a template at the joint and pouring concrete, wherein the concrete is poured by adopting a layering method during pouring.
The utility model discloses a pretensioning method applys prestressing force in each prefabricated bridge piece, and the seam crossing between prefabricated bridge piece only connects the prestressing tendons of two prefabricated bridge pieces and pours the concrete, and seam crossing does not have prestressing force. The arrangement is that the prestress of a span beam is divided into a plurality of sections, the joint is not affected by the prestress, the probability of crack generation is greatly reduced, the crack can not develop to the adjacent prefabricated bridge piece, and the service life of the bridge is prolonged. Compared with the existing hanging basket cantilever pouring construction, the scheme greatly shortens the construction time of the bridge, improves the engineering efficiency and reduces the adverse effect of construction engineering on traffic.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (6)
1. A continuous composite beam, characterized by: including the prefabricated bridge piece of several, the prefabricated bridge piece of several connects gradually, be provided with prestressing tendons (10) in the prefabricated bridge piece, prestressing tendons (10) stretch out the cross-section 35 ~ 45cm of prefabricated bridge piece, prestressing tendons (10) are connected with prestressing tendons (10) one-to-one of adjacent prefabricated bridge piece, be provided with transverse reinforcement (12) on prestressing tendons (10), concrete connecting portion have been pour in the outside of prestressing tendons (10) and transverse reinforcement (12), the cross sectional dimension of concrete connecting portion is the same with the cross sectional dimension of prefabricated bridge piece.
2. A continuous composite girder according to claim 1, wherein the upper portion of the precast bridge segment is provided with two layers of tendons (10), wherein the tendons (10) of the lower layer are arranged in an arc shape and bent upward.
3. A continuous composite girder according to claim 1, wherein the upper transverse reinforcement (12) is welded and the lower transverse reinforcement (12) is bound.
4. A continuous composite girder according to claim 1, wherein a cross section of the precast bridge deck is provided with an adhesive having a thickness of 0.5mm to 1 mm.
5. A continuous composite beam as claimed in claim 1, characterised in that the spacing between the tendons (10) is 35-45 cm.
6. A continuous composite girder according to claim 1, wherein said tendons (10) are welded to the tendons (10) of the adjacent precast bridge segments with the welded overlapping length not less than 10 times the diameter of the tendons (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921736089.2U CN211472128U (en) | 2019-10-16 | 2019-10-16 | Continuity combination beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921736089.2U CN211472128U (en) | 2019-10-16 | 2019-10-16 | Continuity combination beam |
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| CN211472128U true CN211472128U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892552A (en) * | 2022-07-01 | 2022-08-12 | 安徽省公路桥梁工程有限公司 | Box girder type bridge reconstruction construction method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892552A (en) * | 2022-07-01 | 2022-08-12 | 安徽省公路桥梁工程有限公司 | Box girder type bridge reconstruction construction method |
| CN114892552B (en) * | 2022-07-01 | 2023-11-21 | 安徽省公路桥梁工程有限公司 | Box girder type bridge reconstruction construction method |
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