CN109914216B - Assembled large-span ultra-high-performance concrete box girder combined node and connecting method thereof - Google Patents
Assembled large-span ultra-high-performance concrete box girder combined node and connecting method thereof Download PDFInfo
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- CN109914216B CN109914216B CN201910246003.6A CN201910246003A CN109914216B CN 109914216 B CN109914216 B CN 109914216B CN 201910246003 A CN201910246003 A CN 201910246003A CN 109914216 B CN109914216 B CN 109914216B
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 210000001503 joint Anatomy 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000004873 anchoring Methods 0.000 claims description 26
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 5
- 238000010276 construction Methods 0.000 abstract description 29
- 238000009434 installation Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
The invention discloses an assembled large-span ultra-high performance concrete box girder combined node, which comprises a box girder main body and a prestress pull rod; the box girder main body butt joint department sets up to the Z shape and connects, and the overhanging bar is pre-buried to the second butt joint face of Z shape connects, and the first butt joint face of Z shape connects to pre-buried prestressing force pull rod through-hole behind the Z shape connects, and the box girder main body is through pre-buried overhanging bar, prestressing force pull rod through-hole and its corresponding prestressing force pull rod connection, junction concrete grouting material fills. Still include steel anchor block connection system, including L shape steel anchor block and pretension bolt, steel anchor block sets up on the Z font joint of case roof beam main part, pretension bolt sets up on steel anchor block. The connecting method of the assembled large-span ultra-high performance concrete box girder combined type node has the advantages of simple structure, reasonable design, convenient transportation, short construction period, high quality, good stress performance, good durability, low post maintenance and low transportation and installation cost.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to an assembled large-span ultra-high-performance concrete box girder combined node and a connecting method thereof.
Background
At present, the bridge construction in China mainly adopts traditional cast-in-place construction or precast beam end splicing construction. Traditional cast-in-place construction enables components to meet bearing requirements through post-cast concrete or grouting technology. However, more wet operations exist in post-cast concrete construction, the construction period is too long, and the post-cast concrete is not easy to repair once damaged, so that the economic benefit is low. Compared with the cast-in-place construction, the single mechanical connection construction of the precast beam is more convenient, the transportation cost of the large precast member is high, the installation process is complex, the carrying capacity of the precast member is insufficient, the earthquake resistance of the joint is not ideal, brittle failure is easy to occur under the action of mechanical load, and various factors limit the application and development of the assembled bridge in bridge engineering. Therefore, the method solves the problem that the construction period and the engineering quality are contradictory in bridge construction, and is very important for the development and progress of bridge engineering.
The reasonable structural design can greatly reduce the self weight of the prefabricated box girder, so that the prefabricated components are lighter, and the transportation cost and the requirement on large-scale hoisting equipment in the installation process are reduced. The ultra-high performance concrete (UHPC, ultra High Performance Concrete) component has good working performance compared with the common concrete component, and is mainly characterized by high strength, light dead weight, long service life, good fluidity and the like. In addition, the part of the prefabricated structure can be assembled on site, so that the difficulty in the transportation and hoisting processes is further reduced.
The invention considers the defects and limitations of the traditional assembly type bridge node connection mode and the strong support of the national building department in the aspect of assembly type construction, and aims to shorten the engineering period, improve the structural quality, reduce the transportation cost of the components and the installation difficulty by focusing on solving the problem of contradiction between the construction period and the engineering quality and starting from the defects of component design and on-site pouring. The invention has the advantages of short construction period, high quality, excellent stress performance and durability, convenient transportation, low construction and installation cost and capability of meeting the development requirements of the current building industry in China.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the assembled long-span concrete box girder combined node and the connecting method thereof, which have the advantages of simple structure, reasonable design, convenient transportation, short construction period, high quality, good stress performance, good durability, low post maintenance and low transportation and installation cost.
The invention adopts the technical scheme that the assembled large-span concrete box girder combined node comprises a box girder main body, a prestress pull rod and a steel anchor block connecting system; the butt joint of the box girder main body is provided with embedded overhanging steel bars and prestressed pull rod through holes; the steel anchoring block connecting system comprises an L-shaped steel anchoring block and a pre-tightening bolt, wherein the steel anchoring block is arranged at the butt joint part of the box girder main body, and the pre-tightening bolt is arranged on the steel anchoring block; the box girder main body is connected with the corresponding prestressed pull rod through a steel anchoring block connecting system, embedded overhanging steel bars, prestressed pull rod holes and the corresponding prestressed pull rods, and the connecting part is filled with concrete grouting materials.
The box girder main body comprises a hollow box body formed by a bottom plate, a web plate and a bridge deck, and the butt joint part of the box girder main body is a Z-shaped joint.
The pre-buried overhanging steel bars and/or the pre-stressed pull bar through holes are arranged on the second butt joint surface of the Z-shaped joint, and the pre-buried overhanging steel bars and/or the pre-stressed pull bar through holes are arranged on the first butt joint surface of the Z-shaped joint.
One surface of the steel anchoring block is arranged on the Z-shaped joint.
The concrete grouting material is ultra-high performance concrete grouting material.
The web plate, the bottom plate and the bridge deck plate on the box girder main body are all prefabricated by ultra-high performance concrete.
And grouting openings are reserved at the butt joint positions of the Z-shaped joints of the web plate, the bottom plate and the bridge deck plate on the box girder main body.
The connecting method of the assembled large-span ultra-high performance concrete box girder combined type node comprises the following steps:
1) Factory prefabricated component: prefabricating and forming a bottom plate, a web plate and a bridge deck of the box girder main body in a factory, prefabricating a Z-shaped joint at the joint of the box girder main body, embedding overhanging steel bars at the second butt joint surface of the Z-shaped joint, embedding a prestressed pull rod through hole from the first butt joint surface of the Z-shaped joint to the rear of the Z-shaped joint, and embedding a steel anchoring block on the Z-shaped joint;
2) Installing a box girder main body: aligning pre-buried steel anchor blocks at the butt joint positions of the box girder main bodies at two sides, connecting the steel anchor blocks through pre-tightening bolts, and carrying out initial lap joint on the adjusting bolts; aligning pre-embedded pre-stress pull rod through holes on the box girder bodies at two sides, and inserting a pre-stress pull rod from the rear of the Z-shaped connector; butt-jointing the pre-embedded overhanging steel bars on the box girder bodies at two sides; and finally, placing the template on the outer side of the Z-shaped joint, pouring ultra-high performance concrete grouting material into the template through a grouting opening, filling the splicing groove, and tensioning the prestressed reinforcement on the box girder main body after the wet joint reaches the strength required by design.
The invention has the beneficial effects that: the invention adopts a steel anchoring block connecting system, a prestress pull rod and a lap joint embedded overhanging steel bar, and is combined and connected in a plurality of connecting modes for pouring the wet joint of the ultra-high performance concrete, so that the joint of the main body of the box girder is very firm and reliable. Compared with the single connecting modes such as overlapping of embedded overhanging bars, prestressed pull rods and the like, the multi-combination connecting mode is firmer and more durable, and the pouring of ultra-high performance concrete enables the joint to have better stress performance and stability.
The invention prefabricates the joints of the web plate, the bottom plate and the bridge deck of the box girder main body into Z-shaped joints, so as to place a steel anchoring block connecting system, enlarge the concrete pouring area and greatly improve the engineering quality. Meanwhile, the engineering stability of the post-concrete curing is ensured by the connection system of the prestressed pull rod and the steel anchoring block. Thereby ensuring safer engineering and more reliable joint.
According to the invention, the steel anchoring blocks and the lap joint steel bars are pre-buried and placed at the connecting joints of the box girder main body, so that the site construction steps are simplified, the construction time is shortened, and the construction efficiency is improved.
All components of the box girder main body are prefabricated by the ultra-high performance concrete, and the compressive strength, the tensile strength and the toughness of the ultra-high performance concrete are far higher than those of the common concrete and the high performance concrete, so that the box girder main body has excellent stress performance. Meanwhile, the durability of the ultra-high performance concrete can reach more than 100 years, so that the durability such as wear resistance, impermeability, freezing resistance and the like of the invention is far higher than that of the common concrete precast beam.
In summary, the invention combines the dry joint and the wet joint, does not need to use mechanical structures such as steel plates, chemical bolts and the like, can adapt to more complex environments, effectively avoids the damage to the structure caused by external factors such as temperature, humidity and the like, and improves the durability of the joints. Meanwhile, as the node has certain stability and compression resistance, the next construction operation can be continued without waiting for the end of the concrete curing period, thereby simplifying the site construction steps and greatly shortening the construction period.
Drawings
The invention is described in further detail below in connection with the embodiments in the drawings, but is not to be construed as limiting the invention in any way.
Fig. 1 is a cross-sectional view of the junction of the body of the box girder of the present invention.
Fig. 2 is a schematic diagram of the main body structure of the box girder of the present invention.
Fig. 3 is a top view of the body of the box girder of the present invention.
Fig. 4 is a schematic cross-sectional view of the zigzag joint of the present invention.
FIG. 5 is a schematic view of a steel anchor block connection system of the present invention.
Reference numerals: 1. a box girder main body; 2. a steel anchor block; 3. pre-burying overhanging reinforcing steel bars, namely 4, pre-stressing pull rod through holes, 5, pre-stressing pull rods, 6, pre-tightening bolts, 7, pre-tightening bolt connecting holes, 8, Z-shaped connectors, 9, grouting openings, 10 and pouring areas;
101. web plates, 102, bottom plates, 103, bridge decks;
801. a first mating face 802, a second mating face 803, over the zig-zag joint, 804, behind the zig-zag joint.
Detailed Description
Referring to fig. 1, 2 and 4, the assembled long-span concrete box girder combined node comprises a box girder main body 1 and a prestress pull rod 5; the butt joint of the box girder main body 1 is set to be a second butt joint surface 802 of a Z-shaped joint 8,Z and an overhanging steel bar 3 is embedded in the second butt joint surface 802 of the Z-shaped joint 8, a prestress pull rod through hole 4 is embedded in the first butt joint surface 801 of the Z-shaped joint 8 to the rear of the Z-shaped joint 8, the box girder main body 1 is connected through the embedded overhanging steel bar 3, the prestress pull rod through hole 4 and the corresponding prestress pull rod 5, and the connecting part is filled with concrete grouting materials.
As a further improvement, the present invention further comprises a steel anchor block connecting system (see fig. 5) comprising an L-shaped steel anchor block 2 and a pretensioning bolt 7, the steel anchor block 2 being arranged above the zigzag joint 803 of the box girder main body 1, the pretensioning bolt 7 being arranged on the steel anchor block 2.
The invention prefabricates the joints of the web plate 101, the bottom plate 102 and the bridge deck 103 of the box girder main body 1 into the Z-shaped joint 8 so as to place a steel anchoring block connecting system, enlarge the concrete pouring area and greatly improve the engineering quality. Meanwhile, the engineering stability of the post-concrete curing is ensured by the connection system of the prestressed pull rod 5 and the steel anchoring block. Thereby ensuring safer engineering and more reliable joint.
The invention adopts a steel anchoring block connecting system, a prestress pull rod 5 and a lap-jointed embedded overhanging steel bar 3, and is combined and connected in a plurality of connecting modes for pouring an ultra-high performance concrete wet joint, so that the joint of the box girder main body 1 is very firm and reliable. Compared with the single connecting modes of overlapping of the embedded overhanging steel bars 3, the prestressed pull rods 5 and the like, the multi-combination connecting mode is firmer and more durable, and the pouring of the ultra-high performance concrete enables the joint to have better stress performance and stability.
As a further improvement (see fig. 2) the girder body 1 according to the invention is prefabricated as a through-box from a web 101, a floor 102 and a bridge deck 103.
Further, the concrete grouting material is ultra-high performance concrete grouting material.
Further, the web 101, the bottom plate 102 and the bridge deck 103 on the box girder main body 1 are all prefabricated by ultra-high performance concrete. The compressive strength, tensile strength and toughness of the ultra-high performance concrete (UHPC, ultra High Performance Concrete) are far higher than those of the common concrete and the high performance concrete, so that the invention has excellent stress performance. Meanwhile, the durability of the ultra-high performance concrete can reach more than 100 years, and the durability such as wear resistance, impermeability, freezing resistance and the like of the ultra-high performance concrete is far higher than that of the common concrete precast beam.
As a further improvement, the butt joint of the zigzag joint 8 of the web 101, the bottom plate 102 and the bridge deck 103 on the box girder main body 1 is provided with a grouting opening 9 (see fig. 3).
The invention discloses a connecting method of assembled large-span ultra-high performance concrete box girder combined type nodes, which comprises the following steps:
1) Factory prefabricated component: the web 101, the bottom plate 102 and the bridge deck 103 of the box girder main body 1 are prefabricated and molded in factories, the joint of the box girder main body 1 is prefabricated into a Z-shaped joint 8,Z, an overhanging reinforcing steel bar 3 is embedded in a second butt joint 802 of the Z-shaped joint 8, a steel anchoring block 2 is embedded in a pre-stress pull rod through hole 4,Z from a first butt joint 801 of the Z-shaped joint 8 to a rear 804 of the Z-shaped joint;
2) Mounting a box girder main body 1: the steel anchoring blocks 2 pre-buried at the butt joint positions of the box girder main bodies 1 at two sides are aligned and connected through the pre-tightening bolts 7, and the pre-tightening bolts 7 are adjusted to carry out initial lap joint; the pre-buried pre-stress pull rod through holes 4 on the two sides of the box girder main body 1 are aligned, and a pre-stress pull rod 5 is inserted from the rear 804 of the Z-shaped joint; butt-jointing the pre-embedded overhanging steel bars on the box girder main bodies 1 at two sides; finally, placing the template on the outer side of the Z-shaped joint 8, pouring ultra-high performance concrete grouting material into the template through a grouting opening 9, filling the splicing groove, and tensioning the prestressed reinforcement on the box girder main body 1 after the wet joint reaches the strength required by design.
In the installation implementation process of the invention, firstly, when a component is prefabricated in a factory, the joints of a web plate 101, a bottom plate 102 and a bridge deck 103 in a box girder main body 1 are prefabricated into Z-shaped joints 8, a certain number of steel anchoring blocks 2 are pre-embedded on the upper surfaces 803 of the Z-shaped joints, pre-tightening bolt connecting holes 7 or connecting grooves are formed in the steel anchoring blocks 2, and a certain number of pre-stress pull rod through holes 4 are reserved from the first butt joint surfaces 801 of the Z-shaped joints 8 to the rear surfaces 804 of the Z-shaped joints. A certain number of embedded overhanging bars 3 are embedded in the second butt surface 802 of the zigzag joint 8. Pouring holes are reserved at the butt joint positions of the web plate 101, the bottom plate 102 and the Z-shaped joint 8 of the bridge deck 103 of the box girder main body 1. In the construction process, firstly, two box girder main bodies 1 are butted, firstly, web plates 101, bottom plates 102 and steel anchoring blocks 2 on Z-shaped joints 803 on bridge deck 103 of the box girder main bodies 1 are aligned, so that the alignment of pre-tightening bolt connecting holes 7 or connecting grooves is ensured, and the pre-tightening bolts 7 are placed for fixation, and the pre-tightening bolts 7 are screwed for primarily fixing the box girder main bodies 1; secondly, aligning the first butt joint surface 801 of the web plate 101, the bottom plate 102 and the Z-shaped joint 8 on the bridge deck 103 of the box girder main body 1 to the pre-embedded pre-stress pull rod through holes 4 at the back 804 of the Z-shaped joint, and inserting the pre-stress pull rods 5 from the back 804 of the Z-shaped joint; thirdly, carrying out lap joint treatment on the embedded overhanging steel bars 3 of the two prefabricated box girder main bodies 1, and enhancing the connection strength between the box girder main bodies 1; finally, the outer side of a pouring area 10 at the butt joint position of the web plate 101, the bottom plate 102 and the Z-shaped joint 8 of the bridge deck 103 of the box girder main body 1 is blocked by a template, and ultra-high performance concrete is poured from a pouring hole and maintained; the construction of the connecting node is completed. The construction of the next stage can be carried out, the construction period is effectively shortened, and the quality of the engineering is not affected.
In summary, the invention combines the dry joint and the wet joint, does not need to use mechanical structures such as steel plates, chemical bolts and the like, can adapt to more complex environments, effectively avoids the damage to the structure caused by external factors such as temperature, humidity and the like, and improves the durability of the joints. Meanwhile, the node of the invention has certain stability and compression resistance, so that the next construction operation can be continued without waiting for the end of the concrete curing period, the site construction steps are simplified, and the construction period is greatly shortened.
The above examples are provided for convenience of description of the present invention and are not to be construed as limiting the invention in any way, and any person skilled in the art will make partial changes or modifications to the invention by using the disclosed technical content without departing from the technical features of the invention.
Claims (6)
1. The utility model provides an assembled large span ultra-high performance concrete box girder combination formula node which characterized in that: the device comprises a box girder main body, a prestress pull rod and a steel anchoring block connecting system; the steel anchoring block connecting system comprises an L-shaped steel anchoring block and a pre-tightening bolt; the butt joint of the box girder main body is provided with a Z-shaped joint, the steel anchoring block is arranged on the Z-shaped joint of the box girder main body, and the pre-tightening bolt is arranged on the steel anchoring block; the second butt joint surface of the Z-shaped joint is embedded with overhanging bars, and the first butt joint surface of the Z-shaped joint is embedded with a prestressed pull rod through hole from the back of the Z-shaped joint; when the box girder is installed, the pre-buried steel anchoring blocks at the butt joint positions of the adjacent box girder main bodies are aligned, and are connected through pre-tightening bolts, and the pre-tightening bolts are adjusted to carry out initial lap joint; the pre-stressing tension rod through holes pre-buried on the adjacent box girder main bodies are aligned, and a pre-stressing tension rod is inserted from the rear of the Z-shaped connector; the box girder main body is connected through embedded overhanging steel bars, prestressed pull rod through holes and corresponding prestressed pull rods, and the connection part is filled with concrete grouting materials.
2. The fabricated, large span, ultra-high performance concrete box girder composite node of claim 1, wherein: the box girder main body is prefabricated into a through box body by a bottom plate, a web plate and a bridge deck.
3. The fabricated, large span, ultra-high performance concrete box girder composite node of claim 1, wherein: the concrete grouting material is ultra-high performance concrete grouting material.
4. The fabricated, large span, ultra-high performance concrete box girder composite node of claim 1, wherein: the web plate, the bottom plate and the bridge deck plate on the box girder main body are all prefabricated by ultra-high performance concrete.
5. The fabricated, large span, ultra-high performance concrete box girder composite node of claim 1, wherein: the butt joint parts of the Z-shaped joints of the web plate, the bottom plate and the bridge deck on the box girder main body
And a grouting port is reserved.
6. A method of connecting the fabricated long span ultra high performance concrete box girder composite node of any one of claims 1 to 5, comprising the steps of: 1) Factory prefabricated component: prefabricating and forming a bottom plate, a web plate and a bridge deck of the box girder main body in a factory, prefabricating a Z-shaped joint at the joint of the box girder main body, embedding overhanging steel bars at the second butt joint surface of the Z-shaped joint, embedding a prestressed pull rod through hole from the first butt joint surface of the Z-shaped joint to the rear of the Z-shaped joint, and embedding a steel anchoring block on the Z-shaped joint; 2) Installing a box girder main body: aligning pre-buried steel anchor blocks at the butt joint positions of the box girder main bodies at two sides, connecting the steel anchor blocks through pre-tightening bolts, and carrying out initial lap joint on the adjusting bolts; aligning pre-embedded pre-stress pull rod through holes on the box girder bodies at two sides, and inserting a pre-stress pull rod from the rear of the Z-shaped connector; butt-jointing the pre-embedded overhanging steel bars on the box girder bodies at two sides; and finally, placing the template on the outer side of the Z-shaped joint, pouring ultra-high performance concrete grouting material into the template through a grouting opening, filling the splicing groove, and tensioning the prestressed reinforcement on the box girder main body after the wet joint reaches the strength required by design.
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