CN110616646A - Method and structure for reinforcing concrete original bridge - Google Patents
Method and structure for reinforcing concrete original bridge Download PDFInfo
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- CN110616646A CN110616646A CN201910992260.4A CN201910992260A CN110616646A CN 110616646 A CN110616646 A CN 110616646A CN 201910992260 A CN201910992260 A CN 201910992260A CN 110616646 A CN110616646 A CN 110616646A
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- end part
- permeable polymer
- polymer mortar
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 100
- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 62
- 229920000642 polymer Polymers 0.000 claims abstract description 62
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 230000002787 reinforcement Effects 0.000 claims description 43
- 238000013461 design Methods 0.000 claims description 14
- 210000003205 muscle Anatomy 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 7
- 238000009415 formwork Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000005253 cladding Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a reinforcing method and a reinforcing structure of a concrete original bridge, wherein the reinforcing method comprises the following steps: a. removing foreign matters and attachments from the area to be reinforced to expose a new surface of the concrete structure; b. processing corresponding bar planting holes; c. processing corresponding reinforcing ribs, wherein each reinforcing rib comprises a first end part, a second end part opposite to the first end part and a connecting part for connecting the first end part and the second end part, and the first end part and the second end part of each reinforcing rib are fixed in corresponding rib planting holes; d. coating permeable polymer mortar on the concrete surface of the area needing to be reinforced of the original bridge; e. providing a template, coating a layer of release agent on the inner surface of the template, and fixing the template at a preset position to enable the permeable polymer mortar to be positioned in the template; f. and after the permeable polymer mortar is hardened, removing the template. The invention effectively improves the bearing capacity of the bridge, and has lower cost and short construction period.
Description
Technical Field
The invention relates to the technical field of bridge engineering maintenance and reinforcement, in particular to a reinforcement method and a reinforcement structure of a concrete original bridge.
Background
The concrete bridge is used as an important component of land traffic, and is widely applied due to obvious advantages, but along with the increase of the service period of the concrete bridge, the bearing capacity of the bridge is reduced due to the influence of factors such as environment, heavy-duty vehicle action and concrete deterioration on a large number of concrete bridges, so that the concrete bridge cannot meet the normal use function. Therefore, old bridges are reinforced, and the bearing capacity of the old bridges is restored and improved, so that the old bridges continue to serve modern transportation, and huge social benefits and economic benefits can be brought to the country.
The conventional reinforcement methods commonly used at present include: the method for increasing the cross section, adhering steel plates or adhering carbon fiber cloth has the disadvantages of long construction period, high cost, long time for closing traffic and great influence on the society and the travel of residents.
Disclosure of Invention
The invention aims to provide a method and a structure for reinforcing a concrete original bridge, which not only effectively improve the bearing capacity of the bridge, but also have the advantages of low cost, short construction period and no need of traffic closure.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for reinforcing a concrete original bridge, the original bridge including a main reinforcement and concrete coated on an outer periphery of the main reinforcement, wherein: the reinforcing method comprises the following steps:
a. foreign matters and attachments are removed from the area of the original bridge needing to be reinforced, so that a new surface of the concrete structure is exposed;
b. processing corresponding bar planting holes according to the design size of the reinforcing bars, wherein the bar planting holes are required to avoid the main bars and are arranged at a preset interval with the main bars;
c. processing a corresponding reinforcing rib according to design requirements, wherein the reinforcing rib comprises a first end part, a second end part opposite to the first end part and a connecting part for connecting the first end part and the second end part, and the first end part and the second end part of the reinforcing rib are fixed in corresponding rib planting holes;
d. coating a layer of permeable polymer mortar with a preset thickness on the concrete surface of the area needing to be reinforced of the original bridge;
e. providing a box-shaped template, coating a layer of release agent on the inner surface of the template, and fixing the template at a preset position to enable the permeable polymer mortar to be positioned in the template;
f. and after the permeable polymer mortar is hardened, removing the template.
As a further improvement of an embodiment of the present invention, in the step c, a screw is embedded, the position of the screw is staggered from that of the reinforcing rib, in the step e, a fixing hole corresponding to the screw is formed in the template, and the screw passes through the fixing hole and is matched and connected with a bolt to fix the template.
As a further improvement of an embodiment of the present invention, said steps d and e are completed within one hour.
As a further improvement of one embodiment of the invention, the reinforcing rib is of the type HRB335, HRB400 or HRB 500.
As a further improvement of an embodiment of the present invention, the form is provided in plurality, two adjacent forms overlap each other, and an area of the form in a direction perpendicular to the first end portion is not more than 1m2。
In order to achieve one of the above objects, an embodiment of the present invention further provides a reinforcement structure for a concrete original bridge, the reinforcement structure being used for reinforcing the original bridge, the original bridge including a main reinforcement and concrete covering an outer periphery of the main reinforcement, wherein: the reinforcing structure comprises a reinforcing rib and permeable polymer mortar which completely coats the reinforcing rib, the permeable polymer mortar is in contact with the surface of the concrete, and the reinforcing rib comprises a first end portion and a second end portion which are fixedly arranged on the original bridge and a connecting portion which connects the first end portion and the second end portion.
As a further improvement of one embodiment of the invention, the reinforcing rib is of the type HRB335, HRB400 or HRB 500.
As a further improvement of an embodiment of the present invention, corresponding bar planting holes are processed on the original bridge according to the design size of the reinforcing bar, the bar planting holes should avoid the main bar and have a predetermined distance with the main bar, and the first end portion and the second end portion of the reinforcing bar are both fixed in the corresponding bar planting holes.
As a further improvement of an embodiment of the invention, the drilling depth of the bar planting hole is 160-200 mm.
As a further improvement in an embodiment of the present invention, the cohesive strength of the permeable polymer mortar is not less than 2.5MPa, the compressive strength of the permeable polymer mortar is not less than 55MPa, and the flexural strength of the permeable polymer mortar is not less than 12 MPa.
The invention has the beneficial effects that according to the technical scheme adopted by the invention, as the two ends of the reinforcing rib are embedded in the concrete of the original bridge, and the reinforcing rib is completely coated by the permeable polymer mortar. The mechanical properties of the permeable polymer mortar such as compression resistance, fracture resistance and the like have the characteristics of early strength and high strength, and the permeable polymer mortar has ultrahigh bonding strength, has the properties of permeability resistance, freezing resistance, salt resistance, alkali resistance, weak acid corrosion resistance and good durability. The permeable polymer mortar is completely contacted with the surface of old concrete after being formed, has no shrinkage and cracking resistance, and is bonded with a reinforced concrete structure into a whole to cooperatively work. And the permeable polymer mortar can be stressed in coordination with the reinforcing ribs, so that the bearing capacity of the bridge structure is effectively improved, the cost is low, the construction period is short, and traffic does not need to be sealed. Therefore, the original bridge is reinforced by adopting the embedded reinforcing rib and permeable polymer mortar reinforcing technology, so that economic waste is avoided, and the reliability of the original bridge in a service period can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a bottom view of a reinforced original bridge according to an embodiment of the present invention;
FIG. 2 is a side view of the original bridge provided in FIG. 1 after reinforcement;
FIG. 3 is an enlarged partial schematic view at A in FIG. 2;
FIG. 4 is an enlarged cross-sectional view of the original bridge provided in FIG. 1 after reinforcement;
FIG. 5 is a bottom plan view of a prior art original bridge being reinforced and sanded according to an embodiment of the present invention;
FIG. 6 is a side view of the original bridge provided in FIG. 5 before it is reinforced;
FIG. 7 is an enlarged cross-sectional view of the original bridge provided in FIG. 1 prior to unreinforcement;
FIG. 8 is a bottom view of a reinforcing area of an original bridge provided by an embodiment of the present invention, wherein the reinforcing area is drilled with a bar-planting hole and a screw fixing hole;
FIG. 9 is a side view of the original bridge provided in FIG. 8 with rebar drilling and screw fixation holes for the reinforcement area;
FIG. 10 is an enlarged partial schematic view at B of FIG. 9;
FIG. 11 is an enlarged cross-sectional view of the reinforcing area drilled with rebar penetration and screw fixation holes of the original bridge provided in FIG. 8;
FIG. 12 is a bottom view of the original bridge with reinforcing ribs implanted in the reinforcing areas according to the embodiment of the present invention;
FIG. 13 is a side view of the original bridge provided in FIG. 12 with reinforcing ribs implanted in the reinforcing regions;
FIG. 14 is an enlarged partial schematic view at C of FIG. 13;
FIG. 15 is an enlarged, cross-sectional view of the original bridge provided in FIG. 12 with reinforcing ribs implanted in the reinforcing area;
FIG. 16 is a bottom view of a threaded post embedded in a pair of reinforcement areas of a primary bridge according to an embodiment of the present invention;
FIG. 17 is a side view of the original bridge versus reinforcement area threaded rod implant provided in FIG. 16;
FIG. 18 is an enlarged partial schematic view at D of FIG. 17;
FIG. 19 is an enlarged cross-sectional view of the original bridge versus reinforcement area implant screw provided in FIG. 16;
FIG. 20 is a schematic representation of the template-fixing and compression of a permeable polymer mortar in a reinforced area by a primary bridge according to an embodiment of the present invention;
FIG. 21 is a side view of the primary bridge provided in FIG. 20 template-fixing, compacting a permeable polymer mortar;
FIG. 22 is an enlarged partial schematic view at E of FIG. 21;
fig. 23 is an enlarged cross-sectional view of the original bridge provided in fig. 20 template-fixing, compacting permeable polymer mortar in the consolidation area.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.
Moreover, it will be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by the above terms. The above terms are only used to distinguish these descriptive objects from each other. For example, the first end may be referred to as the second end, and likewise, the second end may also be referred to as the first end, without departing from the scope of protection of this application.
Referring to fig. 1 to 4, the present embodiment provides a reinforcing structure of a concrete original bridge 10. The reinforcing structure is used for reinforcing an original bridge 10, and generally, the original bridge 10 comprises a main reinforcement 12 and concrete 14 coated on the periphery of the main reinforcement 12.
The reinforcing structure comprises reinforcing ribs 16 and permeable polymer mortar 18 completely covering the reinforcing ribs 16, the permeable polymer mortar 18 is in contact with the surface of the concrete 14, and the reinforcing ribs 16 comprise a first end part 20 and a second end part 22 which are fixedly arranged on the original bridge 10 and a connecting part 24 for connecting the first end part 20 and the second end part 22. That is, the reinforcing ribs 16 are provided like a U-shape. The reinforcing ribs 16 can be provided in different numbers according to different requirements, in the preferred embodiment, the number of the reinforcing ribs 16 is 4, and of course, the number of the reinforcing ribs 16 can be other numbers.
The plurality of reinforcing ribs 16 are arranged parallel to each other, and in the extending direction of the connecting portion 24, two adjacent reinforcing ribs 16 are not aligned, that is, two adjacent reinforcing ribs 16 are staggered by a certain distance. Further, one of the reinforcing ribs 16 is disposed in alignment with another reinforcing rib 16 spaced therefrom. This embodiment is taken as an example for specific explanation. A plurality of reinforcement muscle 16 are including the first reinforcement muscle 16, the second reinforcement muscle 16, the third reinforcement muscle 16 and the fourth reinforcement muscle 16 of adjacent arrangement in proper order, and on the extending direction of connecting portion 24, the certain distance that staggers of first reinforcement muscle 16 and second reinforcement muscle 16, first reinforcement muscle 16 and third reinforcement muscle 16 set up with each other, and the second reinforcement muscle 16 and fourth reinforcement muscle 16 set up with each other. In addition, the connecting portion 24 of the reinforcing rib 16 is parallel to the main rib 12 of the original bridge 10.
The reinforcing ribs 16 are of the type HRB335, HRB400 or HRB 500. Preferably, the cross section of the reinforcing rib 16 is circular, and the diameter of the reinforcing rib 16 is determined according to the specific design requirement as long as the specified strength is ensured.
In addition, when the reinforcing rib 16 is installed, a corresponding rib planting hole 26 (see fig. 11) is processed on the original bridge 10 according to the design size of the reinforcing rib 16, the rib planting hole 26 should avoid the main rib 12 and set a predetermined distance with the main rib 12, and the first end portion 20 and the second end portion 22 of the reinforcing rib 16 are both fixed in the corresponding rib planting hole 26.
Preferably, the drilling depth of the bar planting holes 26 is 160-200 mm. Of course, the drilling depth of the tendon-embedding hole 26 can be designed to other depth values according to specific design requirements.
In order to ensure the reinforcement firmness and strength, the bonding strength of the permeable polymer mortar 18 is not less than 2.5MPa, the compressive strength of the permeable polymer mortar 18 is not less than 55MPa, and the breaking strength of the permeable polymer mortar 18 is not less than 12 MPa.
The specific implementation mode of the invention also discloses a method for reinforcing the concrete original bridge 10, which comprises the following steps:
a. referring to fig. 5 to 7, foreign materials and attachments are removed from an area of the original bridge 10, which needs to be reinforced, to expose a new surface of the concrete structure; specifically, the concrete 14 matrix in the area to be reinforced is roughened, cleaned and repaired, foreign substances and attachments are removed, and impurities such as surface laitance and oil stains are removed until the new surface of the concrete 14 structure is completely exposed. And the concrete reinforcing member with cracks is repaired firstly, and when the main reinforcement 12 of the original bridge 10 structure has a corrosion phenomenon, the main reinforcement 12 which leaks outside is subjected to rust removal and resistance treatment.
b. Referring to fig. 8 to 11, the corresponding bar planting holes 26 are processed according to the design size of the reinforcing bars 16, and the bar planting holes 26 should avoid the main bars 12 and have a predetermined distance from the main bars 12; specifically, in this step, the position of the main bar 12 is first ascertained, and the bar-planting direction of the reinforcement portion is confirmed and positioned to ensure that the reinforcing bar 16 to be planted is offset from the position of the main bar 12.
c. Referring to fig. 12 to 15 and fig. 2, according to design requirements, processing a corresponding reinforcing rib 16, wherein the reinforcing rib 16 includes a first end portion 20, a second end portion 22 opposite to the first end portion 20, and a connecting portion 24 connecting the first end portion 20 and the second end portion 22, and fixing the first end portion 20 and the second end portion 22 of the reinforcing rib 16 in the corresponding rib planting hole 26;
d. referring to fig. 1 to 4, a layer of permeable polymer mortar 18 with a predetermined thickness is coated on the concrete surface of the original bridge 10 in the area to be reinforced; typically, the permeable polymer mortar 18 is applied to a thickness of approximately 0.5cm, and the permeable polymer mortar 18 needs to be prepared in advance and applied uniformly.
e. Referring to fig. 20-23, a box-like form 28 is provided, and a layer of mold release agent is applied to the interior surface of form 28, and form 28 is held in place so that permeable polymer mortar 18 is located within form 28, thereby compressing and holding the permeable polymer mortar;
f. after the permeable polymer mortar 18 is hardened, the form 28 is removed. The original bridge shown in fig. 1 to 4 is reinforced after the formwork is removed. In addition, after removing form 28, natural curing is sufficient, typically for 1-3 days, during which time the reinforced area should be protected from hard impacts.
Further, as shown in fig. 16 to 19, in step c, the screw 30 is embedded, and the screw 30 is offset from the reinforcing rib 16. Specifically, the screw fixing hole 31 is drilled before the screw 30 is embedded. In step e, form 28 is provided with mounting holes corresponding to screws 30, and screws 30 pass through the mounting holes and are coupled with bolts 32 to fix form 28. In the preferred embodiment, the screw 30 is provided in plural two or more, the number of the fixing holes and the number of the mounting holes are the same as the number of the screws 30, and the positions of the mounting holes correspond to the positions of the screws 30.
Preferably, in step c, before the reinforcing rib 16 is implanted, the hole channels of the reinforcing rib holes 26 are cleaned, and after the reinforcing rib 16 is derusted according to specific design requirements, the two end portions of the reinforcing rib 16 are respectively fixed in the corresponding rib-implanting holes 26. Specifically, the hole cleaning is repeatedly carried out on the bar planting hole 26 and the bar planting hole is wiped by acetone, so that no slurry or accumulated water exists in the bar planting hole 26, bar planting glue is injected into the bar planting hole 26, and the bar planting glue injected into the bar planting hole 26 needs to be injected to about 2/3 hole depth. After the reinforcement ribs 16 are derusted, the two end portions are implanted into the corresponding rib-implanting holes 26. In addition, the glue in the bar planting holes 26 is full after bar planting, and the bolts 32 or the reinforcing bars 16 cannot be disturbed in the curing time, so that the curing effect of the reinforcing bars 16 and the permeable polymer mortar 18 is ensured.
Template 28 should be specifically fabricated according to the design drawing prior to step e, and typically, template 28 should not be oversized. The thickness of form 28 should be determined based on the design thickness of the permeable polymer mortar 18; then, the pre-installation is carried out, and the drilling position of the template 28 is matched with the position of the screw 30 embedded on the site, if the drilling position is not matched, the adjustment is carried out in time. After the permeable polymer mortar 18 is applied, the reinforcing ribs 16 are completely covered by the permeable polymer mortar 18, and the screws 30 extend out of the permeable polymer mortar 18 for fixing the formwork 28
In step d, the permeable polymer mortar 18 should not be too large in one construction area, should be constructed in a staggered manner in strips and blocks, and should be matched with the size of the formwork 28.
Further, when the permeable polymer mortar 18 is subjected to die filling, the permeable polymer mortar 18 in the die plate 28 is ensured to be thick in the middle and thin at the periphery; and after the template 28 is attached to a preset position, the template is fixed and tightly pressed by using the bolts 32, a hand hammer is used for lightly knocking the template 28 along the reinforcing surface in the tightly pressing process, whether the permeable polymer mortar 18 is tightly bonded with the concrete 14 of the reinforced area is judged by sound, if the permeable polymer mortar 18 is not tightly bonded, the template 28 is removed, and after a proper amount of the permeable polymer mortar 18 is continuously added to the void position, the template is fixedly and tightly pressed again until the permeable polymer mortar 18 and the original bridge 10 form a whole.
In the preferred embodiment, the reinforcing bars 16 are embedded in the concrete 14 of the original bridge 10 at both ends, and the permeable polymer mortar 18 completely covers the reinforcing bars 16. The mechanical properties of the permeable polymer mortar 18 such as compression resistance, fracture resistance and the like have the characteristics of early strength and high strength, and the permeable polymer mortar has ultrahigh bonding strength, has the properties of permeability resistance, freezing resistance, salt resistance, alkali resistance, weak acid corrosion resistance and good durability. The permeable polymer mortar 18 is formed to be in complete contact with the surface of the old concrete 14, has no shrinkage and is crack resistant, and is bonded with the structure of the reinforced concrete 14 to be in integral cooperative work. And the permeable polymer mortar 18 and the reinforcing ribs 16 can cooperate to bear force, so that the bearing capacity of the bridge structure is effectively improved, the cost is low, the construction period is short, and traffic does not need to be sealed. Therefore, the original bridge 10 is reinforced by adopting the reinforcing technology of the embedded reinforcing ribs 16+ the permeable polymer mortar 18, so that economic waste is avoided, and the reliability in the service period can be ensured.
Preferably, steps d and e are completed within one hour. I.e. after the application of the permeable polymer mortar 18, the formwork 28 needs to be fixed within one hour, so as to ensure the setting effect of the permeable polymer mortar 18 and the reinforcing bars 16.
To further ensure the setting effect of the permeable polymer mortar 18, a plurality of forms 28 are positioned in zones and the permeable polymer mortar 18 is compacted in zones to allow setting. Specifically, a plurality of forms 28 are provided, adjacent two forms 28 overlap each other, and the area of the form 28 perpendicular to the first end portion 20 is not more than 1m2. Preferably, the overlapping width of two adjacent formworks 28 should be ensured to be more than 1cm, so as to ensure the setting effect of all the permeable polymer mortar 18.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A method for reinforcing an original concrete bridge comprises a main reinforcement and concrete coated on the periphery of the main reinforcement, and is characterized in that: the reinforcing method comprises the following steps:
a. foreign matters and attachments are removed from the area of the original bridge needing to be reinforced, so that a new surface of the concrete structure is exposed;
b. processing corresponding bar planting holes according to the design size of the reinforcing bars, wherein the bar planting holes are required to avoid the main bars and are arranged at a preset interval with the main bars;
c. processing a corresponding reinforcing rib according to design requirements, wherein the reinforcing rib comprises a first end part, a second end part opposite to the first end part and a connecting part for connecting the first end part and the second end part, and the first end part and the second end part of the reinforcing rib are fixed in corresponding rib planting holes;
d. coating a layer of permeable polymer mortar with a preset thickness on the concrete surface of the area needing to be reinforced of the original bridge;
e. providing a box-shaped template, coating a layer of release agent on the inner surface of the template, and fixing the template at a preset position to enable the permeable polymer mortar to be positioned in the template;
f. and after the permeable polymer mortar is hardened, removing the template.
2. The method for reinforcing a concrete original bridge according to claim 1, wherein in the step c, a screw rod is embedded, the position of the screw rod is staggered with that of the reinforcing rib, in the step e, a fixing hole corresponding to the screw rod is formed in the formwork, and the screw rod penetrates through the fixing hole and is matched and connected with a bolt to fix the formwork.
3. A method of reinforcing a concrete original bridge according to claim 1, characterized in that said steps d and e are completed within one hour.
4. A method for reinforcing a concrete original bridge according to claim 1, wherein the reinforcing bars are of the type HRB335, HRB400 or HRB 500.
5. A method of reinforcing a concrete original bridge according to claim 1, wherein said form is provided in plurality, and overlapping is provided between two adjacent forms, and the area of said form in a direction perpendicular to said first end portion is not more than 1m 2.
6. The utility model provides a reinforced structure of former bridge of concrete, reinforced structure is used for consolidating former bridge, former bridge include the owner muscle and cladding in the concrete of owner muscle periphery, its characterized in that: the reinforcing structure comprises a reinforcing rib and permeable polymer mortar which completely coats the reinforcing rib, the permeable polymer mortar is bonded with the surface of the concrete, and the reinforcing rib comprises a first end part and a second end part which are fixedly arranged on the original bridge and a connecting part which is connected with the first end part and the second end part.
7. The reinforcement structure of a concrete original bridge, according to claim 6, wherein the type of the reinforcement bar is HRB335, HRB400 or HRB 500.
8. The reinforcement structure of a concrete original bridge according to claim 6, wherein corresponding bar-planting holes are formed in the original bridge according to the design size of the reinforcement bars, the bar-planting holes are formed to avoid the main bars and have a predetermined distance with the main bars, and the first end portions and the second end portions of the reinforcement bars are fixed in the corresponding bar-planting holes.
9. The reinforcement structure of a concrete original bridge according to claim 8, wherein the drilling depth of the embedded bar holes is 160-200 mm.
10. The reinforcement structure for a concrete original bridge according to claim 6, wherein the adhesive strength of the permeable polymer mortar is not less than 2.5MPa, the compressive strength of the permeable polymer mortar is not less than 55MPa, and the flexural strength of the permeable polymer mortar is not less than 12 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910992260.4A CN110616646A (en) | 2019-10-17 | 2019-10-17 | Method and structure for reinforcing concrete original bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910992260.4A CN110616646A (en) | 2019-10-17 | 2019-10-17 | Method and structure for reinforcing concrete original bridge |
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