Bridge construction method and bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to a bridge construction method which comprises the following steps: S1, prefabricated part production: prefabricated part design: according to a bridge design drawing, decomposing a bridge structure into a plurality of prefabricated parts such as a bridge deck slab, a beam section and a bridge pier; the bridge components are prefabricated in a factory, high precision and high quality are ensured, and the prefabricated components can comprise prefabricated beam sections, bridge deck slabs and pier columns; prefabricated parts adopt modular design, the size is reduced as much as possible, and transportation is convenient; and S2, on-site assembly: foundation construction: carrying out foundation construction on a bridge construction site. The problems of transportation instrument limitation and slow construction progress can be solved, meanwhile, the overall bearing capacity of a bridge is improved, meanwhile, by designing a new and old concrete combined treatment process method, the bonding strength of new and old concrete is enhanced, and cracking caused by the pouring process problem in the follow-up using process of an interface joint is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a bridge construction method and a bridge. Background Art

[0002] Existing prefabricated bridge construction is generally divided into two types, one is the overall prefabricated construction, and the other is the hanging basket construction method. The overall prefabricated construction requires large-scale transportation equipment for transportation, which makes the construction operation inconvenient, while the hanging basket construction usually adopts a construction method in which both ends of the bridge are constructed forward at the same time and then closed in the middle. During the advancement process, the poured concrete needs a certain amount of time to reach a certain strength, which prolongs the construction time. In addition, since the first poured concrete already has a certain strength, the later poured concrete and the first poured concrete cannot completely form a whole, thereby reducing the overall bearing capacity of the bridge. Summary of the invention

[0003] The object of the present invention is to provide a bridge construction method and a bridge to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a bridge construction method, comprising the following steps:

[0005] S1. Prefabricated component production includes:

[0006] Prefabricated component design: According to the bridge design drawings, the bridge structure is decomposed into multiple prefabricated components such as bridge deck, beam segments, and piers;

[0007] Factory prefabrication: Bridge components are prefabricated in the factory to ensure high precision and quality. Prefabricated components can include prefabricated beam segments, bridge decks, and piers;

[0008] Transportation preparation: prefabricated components adopt modular design to minimize volume and facilitate transportation;

[0009] S2. On-site assembly includes:

[0010] Foundation construction: Carry out foundation construction at the bridge construction site, including the construction of piers and abutments to ensure a stable foundation;

[0011] Component transportation: Use transportation tools to transport prefabricated components to the construction site. Since the components are relatively modular, transportation is relatively convenient;

[0012] Component assembly: Use large lifting equipment to assemble prefabricated components on site, and use high-strength bolt connection and steel bar welding fast connection technology to ensure assembly speed and accuracy;

[0013] S3. On-site pouring of key parts includes:

[0014] Closure section construction: For the closure section problem in the hanging basket construction, after the prefabrication and assembly are completed, the location of the closure section is reserved; concrete is poured on site at the closure section location to ensure the effective connection between the new and old concrete;

[0015] Casting technology: Use high-performance concrete and appropriate construction techniques, such as vibration and curing, to ensure good bonding between cast concrete and previously precast components, and use new and old concrete combination treatment methods to enhance the bond strength between new and old concrete;

[0016] S4. Subsequent processing includes:

[0017] Overall maintenance: After assembly and pouring, the entire bridge structure is uniformly maintained to ensure that the concrete strength meets the design requirements.

[0018] Preferably, the new and old concrete combination treatment process specifically includes two methods: new and old concrete combination optimization and concrete construction process optimization, so as to solve the cracking caused by poor interface bonding between new and old concrete during the pouring process.

[0019] Preferably, the new and old concrete combination optimization includes:

[0020] Interface roughening: Mechanically roughen the contact surface between new and old concrete to increase the contact area and friction;

[0021] Interface agent: Before pouring new concrete, apply interface agent on the surface of old concrete to improve the bonding strength between new and old concrete;

[0022] Wetting treatment: Make sure the surface of the old concrete is moist but without water accumulation to prevent the newly poured concrete from absorbing water too quickly and causing poor bonding.

[0023] Preferably, the new and old concrete combination optimization includes:

[0024] Physical connection and rebar implantation technology: rebars are implanted in the old concrete, with one end of the rebar buried in the old concrete and the other end extending into the newly poured concrete to enhance the interface bonding strength;

[0025] Use anchors: pre-embed anchors at the interface and use mechanical anchoring to improve the tensile and shear strength of the joint.

[0026] Preferably, the concrete construction process includes:

[0027] Continuous pouring:

[0028] Reasonably arrange the pouring sequence: adopt continuous pouring method to reduce the occurrence of construction joints, pour in sections, shorten the interval time, and pour twice before the initial setting of concrete;

[0029] Control of pouring layers: When pouring in layers, control the thickness of each layer to avoid poor bonding between the upper and lower layers of concrete due to excessive thickness of the pouring layer.

[0030] Preferably, the concrete construction process includes:

[0031] Vibration process:

[0032] Fully vibrate: Ensure that the newly poured concrete is fully vibrated at the interface to eliminate bubbles and voids and enhance interface bonding;

[0033] Uniform vibration: Vibrate evenly to avoid segregation caused by excessive vibration.

[0034] Preferably, in step S3, self-compacting concrete is used and polymer materials, such as latex and polymer fibers, are added to the poured self-compacting concrete to enhance bonding properties.

[0035] Preferably, in said S4, the subsequent treatment is covered with wet sacks: after pouring is completed, the wet sacks are covered for curing to keep the interface moist and prevent excessive water loss, and at the same time, the curing agent is sprayed: the curing agent is used to spray the interface to prevent excessive evaporation of water and promote better bonding between new and old concrete.

[0036] A bridge constructed using bridge construction methods.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] In order to solve the shortcomings of the overall assembly construction and hanging basket construction methods, this application adopts a comprehensive bridge construction method, combines the advantages of prefabrication and on-site casting, and proposes a new construction technology. This method can overcome the problems of transportation equipment limitations and slow construction progress, while improving the overall bearing capacity of the bridge. At the same time, by designing a combined treatment process for new and old concrete, the bonding strength of new and old concrete is enhanced to prevent cracking at the interface junction due to casting process problems during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a flow chart of the bridge construction method of the present invention; Figure 2 The new and old concrete combination optimization flow chart of the present invention; Figure 3 It is a flow chart of the concrete construction process of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figures 1 to 3 , the present invention provides a technical solution:

[0046] A bridge construction method comprises the following steps:

[0047] S1. Prefabricated component production includes:

[0048] Prefabricated component design: According to the bridge design drawings, the bridge structure is decomposed into multiple prefabricated components such as bridge deck, beam segments, and piers;

[0049] Factory prefabrication: Bridge components are prefabricated in the factory to ensure high precision and quality. Prefabricated components can include prefabricated beam segments, bridge decks, and piers;

[0050] Transportation preparation: prefabricated components adopt modular design to minimize volume and facilitate transportation;

[0051] S2. On-site assembly includes:

[0052] Foundation construction: Carry out foundation construction at the bridge construction site, including the construction of piers and abutments to ensure a stable foundation;

[0053] Component transportation: Use transportation tools to transport prefabricated components to the construction site. Since the components are relatively modular, transportation is relatively convenient;

[0054] Component assembly: Use large lifting equipment to assemble prefabricated components on site, and use high-strength bolt connection and steel bar welding fast connection technology to ensure assembly speed and accuracy;

[0055] S3. On-site pouring of key parts includes:

[0056] Closure section construction: For the closure section problem in the hanging basket construction, after the prefabrication and assembly are completed, the location of the closure section is reserved; concrete is poured on site at the closure section location to ensure the effective connection between the new and old concrete;

[0057] Casting technology: Use high-performance concrete and appropriate construction techniques, such as vibration and curing, to ensure good bonding between cast concrete and previously precast components, and use new and old concrete combination treatment methods to enhance the bond strength between new and old concrete;

[0058] S4. Subsequent processing includes:

[0059] Overall maintenance: After assembly and pouring, the entire bridge structure is uniformly maintained to ensure that the concrete strength meets the design requirements.

[0060] The new and old concrete combination treatment process method specifically includes two methods: new and old concrete combination optimization and concrete construction process optimization, which solves the problem of cracking caused by poor interface bonding between new and old concrete during the pouring process.

[0061] The optimization of the combination of new and old concrete includes:

[0062] Interface roughening: Mechanically roughen the contact surface between new and old concrete to increase the contact area and friction;

[0063] Interface agent: Before pouring new concrete, apply interface agent on the surface of old concrete to improve the bonding strength between new and old concrete;

[0064] Wetting treatment: Make sure the surface of the old concrete is moist but without water accumulation to prevent the newly poured concrete from absorbing water too quickly and causing poor bonding.

[0065] Physical connection and rebar implantation technology: rebars are implanted in the old concrete, with one end of the rebar buried in the old concrete and the other end extending into the newly poured concrete to enhance the interface bonding strength;

[0066] Use anchors: pre-embed anchors at the interface and use mechanical anchoring to improve the tensile and shear strength of the joint.

[0067] The concrete construction process comprises:

[0068] Continuous pouring:

[0069] Reasonably arrange the pouring sequence: adopt continuous pouring method to reduce the occurrence of construction joints, pour in sections, shorten the interval time, and pour twice before the initial setting of concrete;

[0070] Control of pouring layers: When pouring in layers, control the thickness of each layer to avoid poor bonding between the upper and lower layers of concrete due to excessive thickness of the pouring layer.

[0071] Vibration process:

[0072] Fully vibrate: Ensure that the newly poured concrete is fully vibrated at the interface to eliminate bubbles and voids and enhance interface bonding;

[0073] Uniform vibration: Vibrate evenly to avoid segregation caused by excessive vibration.

[0074] In the step S3, self-compacting concrete is used and polymer materials, such as latex and polymer fibers, are added to the poured self-compacting concrete to enhance the bonding performance.

[0075] In the said S4, in the subsequent treatment, wet sacks are used for covering: after the pouring is completed, wet sacks are covered for curing to keep the interface moist and prevent water loss too quickly, and curing agent is sprayed at the same time: curing agent is used to spray the interface to prevent water from evaporating too quickly and promote better bonding between new and old concrete.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bridge construction method, characterized in that: The steps include: S1. Prefabricated component production includes: Prefabricated component design: According to the bridge design drawings, the bridge structure is decomposed into multiple prefabricated components such as bridge deck, beam segments, and piers; Factory prefabrication: Bridge components are prefabricated in the factory to ensure high precision and quality. Prefabricated components can include prefabricated beam segments, bridge decks, and piers; Transportation preparation: prefabricated components adopt modular design to minimize volume and facilitate transportation; S2. On-site assembly includes: Foundation construction: Carry out foundation construction at the bridge construction site, including the construction of piers and abutments to ensure a stable foundation; Component transportation: Use transportation tools to transport prefabricated components to the construction site. Since the components are relatively modular, transportation is relatively convenient; Component assembly: Use large lifting equipment to assemble prefabricated components on site, and use high-strength bolt connection and steel bar welding fast connection technology to ensure assembly speed and accuracy; S3. On-site pouring of key parts includes: Closure section construction: For the closure section problem in the hanging basket construction, after the prefabrication and assembly are completed, the location of the closure section is reserved; concrete is poured on site at the closure section location to ensure the effective connection between the new and old concrete; Casting technology: Use high-performance concrete and appropriate construction techniques, such as vibration and curing, to ensure good bonding between cast concrete and previously precast components, and use new and old concrete combination treatment methods to enhance the bond strength between new and old concrete; S4. Subsequent processing includes: Overall maintenance: After assembly and pouring, the entire bridge structure is uniformly maintained to ensure that the concrete strength meets the design requirements.

2. A bridge construction method according to claim 1, characterized in that: The new and old concrete combination treatment process method specifically includes two methods: new and old concrete combination optimization and concrete construction process optimization, which solves the problem of cracking caused by poor interface bonding between new and old concrete during the pouring process.

3. A bridge construction method according to claim 2, characterized in that: The optimization of the combination of new and old concrete includes: Interface roughening: Mechanically roughen the contact surface between new and old concrete to increase the contact area and friction; Interface agent: Before pouring new concrete, apply interface agent on the surface of old concrete to improve the bonding strength between new and old concrete; Wetting treatment: Make sure the surface of the old concrete is moist but without water accumulation to prevent the newly poured concrete from absorbing water too quickly and causing poor bonding.

4. A bridge construction method according to claim 2, characterized in that: The optimization of the combination of new and old concrete includes: Physical connection and rebar implantation technology: rebars are implanted in the old concrete, with one end of the rebar buried in the old concrete and the other end extending into the newly poured concrete to enhance the interface bonding strength; Use anchors: pre-embed anchors at the interface and use mechanical anchoring to improve the tensile and shear strength of the joint.

5. A bridge construction method according to claim 2, characterized in that: The concrete construction process comprises: Continuous pouring: Reasonably arrange the pouring sequence: adopt continuous pouring method to reduce the occurrence of construction joints, pour in sections, shorten the interval time, and pour twice before the initial setting of concrete; Control of pouring layers: When pouring in layers, control the thickness of each layer to avoid poor bonding between the upper and lower layers of concrete due to excessive thickness of the pouring layer.

6. A bridge construction method according to claim 2, characterized in that: The concrete construction process comprises: Vibration process: Fully vibrate: Ensure that the newly poured concrete is fully vibrated at the interface to eliminate bubbles and voids and enhance interface bonding; Uniform vibration: Vibrate evenly to avoid segregation caused by excessive vibration.

7. A bridge construction method according to claim 2, characterized in that: In the step S3, self-compacting concrete is used and polymer materials, such as latex and polymer fibers, are added to the poured self-compacting concrete to enhance the bonding performance.

8. A bridge construction method according to claim 2, characterized in that: In the said S4, in the subsequent treatment, wet sacks are used for covering: after the pouring is completed, wet sacks are covered for curing to keep the interface moist and prevent water loss too quickly, and curing agent is sprayed at the same time: curing agent is used to spray the interface to prevent water from evaporating too quickly and promote better bonding between new and old concrete.

9. A bridge, characterized in that: The bridge is constructed by using the bridge construction method described in any one of claims 1 to 8.

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