CN216515072U - Steel bar protection layer cushion block combined component for prefabricated box girder - Google Patents
Steel bar protection layer cushion block combined component for prefabricated box girder Download PDFInfo
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- CN216515072U CN216515072U CN202123071972.4U CN202123071972U CN216515072U CN 216515072 U CN216515072 U CN 216515072U CN 202123071972 U CN202123071972 U CN 202123071972U CN 216515072 U CN216515072 U CN 216515072U
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- protective layer
- cushion block
- steel bar
- fiber composite
- basalt fiber
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Abstract
The utility model discloses a steel bar protective layer cushion block combined component for a prefabricated box girder, which comprises a basalt fiber composite rib and a plurality of protective layer cushion blocks, wherein the protective layer cushion blocks are positioned on the basalt fiber composite rib and are uniformly prefabricated along the axial direction of the basalt fiber composite rib; the protective layer cushion block is made of ultra-high performance concrete by pouring. The basalt fiber composite bar adopted in the utility model is not rusted, so that the requirement on the thickness of a steel bar protective layer is not required to be met, and the problem that the thickness of the steel bar protective layer is insufficient due to the fact that the existing steel bar is bound at the outer end of the vertical frame vertical bar is solved; the basalt fiber composite bar has higher strength than a common steel bar with the same specification, so that the basalt fiber composite bar is not easy to bend, and the problem that the thickness of a corresponding steel bar protective layer is too low or even the bar is exposed because the existing steel bar is thin and easy to bend is solved; the protective layer cushion block is formed by pouring ultrahigh-performance concrete, and the problem that the thickness of protective layers of reinforcing steel bars and corresponding reinforcing steel bars on a reinforcing cage is insufficient due to insufficient strength and breakage of the conventional cushion block is solved.
Description
Technical Field
The utility model belongs to the technical field of prefabricated box girders, and particularly relates to a steel bar protection layer cushion block combined component for a prefabricated box girder.
Background
The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder, wherein the box girder prefabricated in an independent site is combined with a bridge girder erection machine to be erected after the lower engineering is completed, so that the engineering progress can be accelerated, the construction period can be saved, and the construction method is widely applied.
The prefabricated box girder is prefabricated through formworks, wherein the formworks have a structure shown in fig. 1 and comprise a bottom formwork 01, an inner formwork 02, a reinforcement cage 03, web outer formworks 04 on two sides and end formworks on two ends, and after the formworks are erected, concrete is poured in a section line area in fig. 1, so that the box girder with a concrete structure is finally formed. The steel reinforcement cage 03 is manufactured on a jig frame of a factory, after the manufacturing is finished, steel reinforcements 05 are bound at the outer ends of vertical erection ribs 031 of the steel reinforcement cage 03, then cushion blocks 06 made of common concrete are strung on the steel reinforcements 05, then the steel reinforcement cage 03 with the cushion blocks 06 and the steel reinforcements 05 installed is hoisted to the inner side of a web outer mold 04, wherein the cushion blocks 06 are attached to the inner ends of the web outer mold 04 on the corresponding side so as to ensure the thickness of a protective layer of the vertical erection ribs 031 on the steel reinforcement cage 03; and finally hoisting the inner mold 02 in place.
However, as can be seen from the service condition of the box girder prefabricated by using the formwork shown in fig. 1, under the influence of deicing salt and molten water flowing down from the bridge floor, if the thickness of the steel bar protection layer at the web of the prefabricated box girder edge girder is insufficient, steel bars are easily corroded, and the use of the prefabricated girder is influenced.
The reasons for insufficient thickness of the steel bar protection layer at the web plate of the edge beam of the precast box girder mainly include the following three reasons:
firstly, the method comprises the following steps: in the design stage, the thickness of the steel bar protective layer at the web plate of the edge beam of the precast box beam refers to the distance between the steel bar at the outermost end of the steel bar cage 03 (namely, the vertical erection rib 031) and the inner end face of the web plate outer die 04, namely, the distance L1 in fig. 1 is a design value L0 meeting the requirement of the thickness of the steel bar protective layer; however, when the reinforcing steel bars 05 for installing the cushion blocks 06 are bound on the outer ends of the vertical frame studs 031, as shown in fig. 1, the distance L2 between the outer ends of the reinforcing steel bars 05 and the inner end faces of the web outer molds 04 is inevitably smaller than the designed value L0, i.e. the thickness of the protective layer of the reinforcing steel bars 05 is insufficient;
secondly, the method comprises the following steps: when the inner die 02 is hoisted, the cushion block 06 on one side is not strong enough to bear the extrusion and impact generated by the deflection of the inner die 02, so that deformation and crushing occur, and finally the inner die 02 and the reinforcement cage 03 are deviated to the deformed and crushed side of the cushion block, so that the thicknesses of the protective layers of the corresponding reinforcements on the reinforcement cage 3 and the reinforcement cage 05 on the side are not enough;
thirdly, the method comprises the following steps: in order to increase the thickness of the protective layer of the steel bar 05 to the maximum, the steel bar 05 (the diameter is usually 8mm) used in the field construction is thin and cannot be thickened; when the inner die 02 or the reinforcement cage 03 deviates to one side, the side cushion block 06 is used for jacking the reinforcement cage 02 to the other side under the support of the side web outer die 04 and the reinforcement 05, so that the distance between the side vertical erection reinforcement and the side web outer die 04 is controlled; however, the reinforcing steel bars 05 adopted in field construction are thin, the thin reinforcing steel bars 05 are easy to bend towards the direction of the reinforcing cage 03 under the jacking action of the cushion blocks 06, and once the reinforcing steel bars 05 bend, the corresponding cushion blocks lose the jacking action, so that the distance between the reinforcing steel bars and the side web outer die 04 cannot be controlled for the vertical erection bars on the side, and finally the thickness of the protective layers of the corresponding reinforcing steel bars on the reinforcing steel bars 05 and the reinforcing cage 3 cannot be ensured. Taking the bending of the steel bar 03 at the position a in fig. 1 as an example, a top view of the bending is shown in fig. 2, when the inner die 02 or the steel bar cage 03 deviates to the left, the cushion block 06 applies a rightward acting force to the steel bar cage 03 under the support of the left web outer die 04 and the steel bar 05 to push the steel bar cage 03 to the right, however, the thin steel bar 05 bends towards the steel bar cage 03 under the jacking action of the cushion block 06, the cushion block 06 at the bending position is far away from the web outer die 04 at the corresponding side and loses the jacking action on the steel bar cage 03, and the steel bar cage 03 cannot be pushed to the right any more, so that the thickness of the protective layer for the steel bar at the left side of the steel bar cage 03 cannot be ensured, and the thickness of the protective layer at the side is relatively low or even the steel bar is exposed.
Based on above problem, the application provides a reinforcing bar protective layer cushion combined member for precast box girder, including the compound muscle of basalt fiber and set up the protective layer cushion that forms by ultra high performance concrete placement on the compound muscle of basalt fiber, thereby solve present reinforcing bar 05 because of the ligature reinforcing bar 05 protective layer thickness not enough problem that leads to in vertical frame muscle outer end, the problem of the unable protective layer thickness of guaranteeing reinforcing bar 05 and the corresponding reinforcing bar protective layer on the steel reinforcement cage 3 that leads to of the easy bending of current reinforcing bar 05 because of thin, the problem that the protective layer thickness of reinforcing bar 05 and the corresponding reinforcing bar on the steel reinforcement cage 3 that leads to of the not enough breakage of current cushion 06 because of intensity is all not enough.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a steel bar protection layer cushion block combined component for a prefabricated box girder.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a steel bar protective layer cushion block combined component for a precast box girder comprises a basalt fiber composite rib and a plurality of protective layer cushion blocks which are positioned on the basalt fiber composite rib and are uniformly precast along the axial direction of the basalt fiber composite rib;
the basalt fiber composite rib is positioned in the center of the protective layer cushion block;
the protective layer cushion block is made of ultra-high performance concrete by pouring.
Preferably, the diameter of the basalt fiber composite rib is 10 mm-15 mm.
Preferably, the distance between adjacent protective layer mats is 50 cm.
Preferably, the protective layer cushion block is of a centrosymmetric structure, the axial section of the protective layer cushion block is of a circular structure, and the radial section of the protective layer cushion block is of an oval structure;
the central axis of the protective layer cushion block is consistent with the central axis of the basalt fiber composite rib.
Preferably, the protective layer cushion block is of a cylindrical structure, and the central axis of the protective layer cushion block is consistent with the central axis of the basalt fiber composite rib.
The utility model has the beneficial effects that:
(1) the basalt fiber composite bar adopted in the utility model is different from the existing used steel bar, and the corrosion does not occur, so that the requirement on the thickness of a steel bar protective layer is not required to be met, therefore, when the basalt fiber composite bar is bound at the outer end of the vertical frame vertical bar, on one hand, the problem of insufficient thickness of the steel bar protective layer caused by binding the existing steel bar at the outer end of the vertical frame vertical bar is solved; on the other hand, the basalt fiber composite bar has higher strength than a common steel bar with the same specification, so that the basalt fiber composite bar is not easy to bend; meanwhile, the basalt fiber composite bar does not need to meet the thickness of a protective layer of the steel bar, and can be thickened properly to increase the strength of the steel bar, so that the steel bar is not easy to bend; thereby solved current reinforcing bar and can't guarantee the problem of reinforcing bar and the corresponding reinforcing bar protective layer thickness on the steel reinforcement cage because of thin easy crooked and lead to.
(2) The protective layer cushion block is formed by pouring the ultra-high performance concrete, and the ultra-high performance concrete has ultra-high mechanical property and compressive strength compared with common concrete, so that the problem of insufficient protective layer thickness caused by insufficient strength and breakage of the existing cushion block is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of a template in the background art;
FIG. 2 is a schematic view showing a structure of a prior art reinforcing bar when bent;
fig. 3 is a schematic structural view of a steel bar protection layer cushion block combined member for a prefabricated box girder in embodiment 2 of the utility model;
FIG. 4 is a schematic structural diagram of a steel bar protection layer cushion block combined member for a precast box girder according to embodiment 3 of the present invention;
wherein:
01-bottom die, 02-inner die, 03-reinforcement cage, 031-vertical erection rib, 04-web outer die, 05-reinforcement and 06-cushion block;
1-basalt fiber composite rib and 2-protective layer cushion block.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "bottom", "top", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and do not particularly indicate any components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The utility model is further illustrated with reference to the following figures and examples.
Example 1:
as shown in fig. 3 or 4, a steel bar protective layer cushion block combined component for a precast box girder comprises a basalt fiber composite rib 1 and a plurality of protective layer cushion blocks 2 which are positioned on the basalt fiber composite rib 1 and are uniformly precast along the axial direction of the basalt fiber composite rib 1;
the basalt fiber composite rib 1 is positioned in the center of the protective layer cushion block 2;
the protective layer cushion block 2 is made of ultra-high performance concrete by pouring.
The basalt fiber composite bar 1 is different from the existing steel bar 05, firstly, the basalt fiber composite bar is not rusted, and therefore the requirement on the thickness of a steel bar protective layer is not required to be met; secondly, the strength of the steel bar is higher than that of a common steel bar with the same specification, and can reach more than 2 times of that of the common steel bar with the same specification; thirdly, the density of the composite steel bar is smaller than that of the common steel bar and is only about 1/4 of the common steel bar, and the low density of the basalt fiber composite steel bar reduces the weight of the composite steel bar, so that the transportation, construction and installation processes are more convenient.
Therefore, when the basalt fiber composite bars 1 are bound at the outer ends of the vertical frame vertical bars 031, on one hand, the problem that the protective layer thickness of the steel bar 05 is insufficient due to the fact that the existing steel bar 05 is bound at the outer ends of the vertical frame vertical bars in the background art is solved; on the other hand, the basalt fiber composite bar has higher strength than a common steel bar with the same specification, so that the basalt fiber composite bar is not easy to bend; meanwhile, the basalt fiber composite bar 1 does not need to meet the thickness of a protective layer of the steel bar, and can be thickened properly to increase the strength of the steel bar, so that the steel bar is not easy to bend; thereby solved current reinforcing bar 05 that mentions among the background art and can't guarantee the problem of reinforcing bar 05 and the corresponding steel bar protective layer thickness on the steel reinforcement cage 3 because of thin easy bending leads to avoided the emergence of corresponding steel bar protective layer thickness on the low side even exposed muscle problem.
Meanwhile, the protective layer cushion block 2 is formed by pouring the ultra-high-performance concrete, and compared with the common concrete, the ultra-high-performance concrete has ultra-high mechanical property and compressive strength, wherein the compressive strength of the ultra-high-performance concrete can reach 120Mpa, so that the problem that the thickness of the protective layer of the corresponding steel bar on the steel bar 05 and the steel bar cage 03 is insufficient due to insufficient strength and breakage of the existing cushion block 06 in the background art is solved.
Preferably, the diameter of the basalt fiber composite bar 1 is 10 mm-15 mm.
Preferably, the distance between adjacent protective layer spacers 2 is 50 cm.
Example 2:
on the basis of the embodiment 1, as shown in fig. 3, the protective layer cushion block 2 is of a central symmetrical structure, the axial section of the protective layer cushion block 2 is of a circular structure, and the radial section of the protective layer cushion block 2 is of an elliptical structure;
the central axis of the protective layer cushion block 2 is consistent with the central axis of the basalt fiber composite rib 1.
When the protective layer cushion block 2 adopts the structure of the embodiment 2, the outer surface of the protective layer cushion block is of a curved surface structure, and the contact area between the protective layer cushion block and the web outer die 04 is small, so that when concrete is poured in a template in construction, the protective layer cushion block 2 can be wrapped by the concrete more easily, and the formed box girder has a smooth appearance.
Example 3:
on the basis of the embodiment 1, as shown in fig. 4, the protective layer pad 2 is in a cylindrical structure, and the central axis of the protective layer pad 2 is consistent with the central axis of the basalt fiber composite rib 1.
In the steel bar protective layer cushion block combined member for the precast box girder in the embodiment 1, the embodiment 2 or the embodiment 3, the protective layer cushion block 2 is directly precast on the basalt fiber composite bar 1.
Protective layer cushion combination member prefabricates protective layer cushion 2 on basalt fiber composite reinforcement 1 before going up the ligature toward vertical frame muscle 031 in this application in advance, then will prefabricate the vertical frame muscle 031 outer end of protective layer cushion combination member ligature on steel reinforcement cage 03 as an organic whole to concatenate cushion 06's process, labour saving and time saving after reducing among the prior art tie reinforcing bar 05 again one by one.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (5)
1. A steel bar protective layer cushion block combined component for a precast box girder is characterized by comprising a basalt fiber composite rib and a plurality of protective layer cushion blocks which are positioned on the basalt fiber composite rib and are uniformly precast along the axial direction of the basalt fiber composite rib;
the basalt fiber composite rib is positioned in the center of the protective layer cushion block;
the protective layer cushion block is made of ultra-high performance concrete by pouring.
2. A reinforcing bar protective layer mat unit for a precast box girder according to claim 1, wherein the basalt fiber composite rib has a diameter of 10mm to 15 mm.
3. A precast box girder reinforcing bar cover mat unit construction as set forth in claim 1, wherein the distance between adjacent cover mats is 50 cm.
4. A steel bar protection cover cushion block combined component for a precast box girder according to any one of claims 1 to 3, wherein the protection cover cushion block has a central symmetrical structure, the axial section of the protection cover cushion block has a circular structure, and the radial section of the protection cover cushion block has an elliptical structure;
the central axis of the protective layer cushion block is consistent with the central axis of the basalt fiber composite rib.
5. A steel bar protective layer cushion block combined component for a precast box girder according to any one of claims 1 to 3, wherein the protective layer cushion block is in a cylindrical structure, and the central axis of the protective layer cushion block is consistent with the central axis of the basalt fiber composite bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123071972.4U CN216515072U (en) | 2021-12-09 | 2021-12-09 | Steel bar protection layer cushion block combined component for prefabricated box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123071972.4U CN216515072U (en) | 2021-12-09 | 2021-12-09 | Steel bar protection layer cushion block combined component for prefabricated box girder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216515072U true CN216515072U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123071972.4U Active CN216515072U (en) | 2021-12-09 | 2021-12-09 | Steel bar protection layer cushion block combined component for prefabricated box girder |
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| Country | Link |
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| CN (1) | CN216515072U (en) |
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- 2021-12-09 CN CN202123071972.4U patent/CN216515072U/en active Active
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