CN111395209A - Reinforcing device and reinforcing method for concrete beam web - Google Patents
Reinforcing device and reinforcing method for concrete beam web Download PDFInfo
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- CN111395209A CN111395209A CN202010261463.9A CN202010261463A CN111395209A CN 111395209 A CN111395209 A CN 111395209A CN 202010261463 A CN202010261463 A CN 202010261463A CN 111395209 A CN111395209 A CN 111395209A
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- 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
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Abstract
The application relates to a reinforcing device and a reinforcing method for a concrete beam web, which comprises a carrier beam and a plurality of prestressed tendons arranged at intervals, wherein the carrier beam is arranged on a beam body bottom plate, and the length of the carrier beam extends along the transverse bridge direction; one end of the prestressed tendon is anchored on the bearing beam to stretch the bearing beam to apply vertical compressive stress on the beam body, and the other end of the prestressed tendon is used for penetrating through the beam body from the bottom plate of the beam body to the top plate of the beam body and is anchored on the top plate of the beam body. This application runs through the roof beam body with the prestressed tendons, and with the carrier bar anchor under the roof beam body bottom plate, through stretch-draw carrier bar in order to exert vertical compressive stress to the roof beam body, the reinforcement is consolidated to the mode that this application adopted and applys vertical compressive stress, belong to the initiative reinforcement category from the effect principle, owing to add reinforcing material initiative application of force after, the stress state of the former roof beam body has been improved, prevent concrete beam body web slant, the level continues to increase to the crack and makes the crack closed completely even, the drawback of adding reinforcing material "meeting an emergency" after having solved, add reinforcing material utilization ratio after improving.
Description
Technical Field
The application relates to the field of bridge structure reinforcement, in particular to a reinforcing device and a reinforcing method for a concrete beam web.
Background
The concrete beam bridge web cracking is a problem generally concerned by the bridge engineering industry in recent years, generally expressed as web shear cracking and has high harmfulness. The reason for this is that the main tensile stress of the beam is too large due to insufficient reinforcement, no vertical prestress or insufficient vertical prestress tension during the design of the beam web cracks.
For the diseases, the commonly used reinforcing method at present comprises (1) increasing the section reinforcement, also called an outsourcing concrete reinforcing method, and improving the bearing capacity and rigidity of the member by increasing the section of the concrete member and increasing the reinforcing bars. During reinforcement, the concrete member can be externally coated and reinforced on one side, two sides or the periphery of the section of the concrete member. (2) The reinforcing method by sticking steel plate is to stick the steel plate to the tension edge or weak part of concrete member to form a whole with the concrete member to bear force together, so as to improve the bending resistance, shearing resistance and rigidity, improve the stress state of the steel bar and concrete of the concrete member, and limit the further development of cracks, thereby improving the bearing capacity and durability of the bridge. (3) The reinforcing method by adhering fiber materials (carbon fiber and aramid fiber) is characterized in that an adhesive is utilized to adhere a carbon fiber reinforced composite material (CFRP) on the surface of a concrete member, and when the load of the concrete member is increased, the carbon fiber cloth and the concrete member cooperatively deform to jointly bear force, so that the bearing capacity and rigidity of the concrete member are improved, and the reinforcing effect on the concrete member is achieved.
The common defects of the reinforcement methods are that the reinforcement methods are passive reinforcement, namely, the reinforcement materials are directly added in the weak area of the bearing capacity of the concrete member, the characteristics of load reinforcement and staged stress must be considered when the section is enlarged, the steel plate is pasted and the high-strength composite fiber material (carbon fiber and aramid fiber) is pasted, namely the self weight and the dead load of the reinforced concrete member are borne by the original beam; if the traffic is completely closed during reinforcement, the load of the passing vehicles after the traffic is completely reinforced is borne by the reinforced combined section; if traffic is limited during reinforcement, the traffic load is borne by the reinforced combined cross section during reinforcement, the vehicle load increased after reinforcement is borne by the reinforced combined cross section, and the strength exertion degree of the post-reinforcing material is limited by the deformation of the original beam, namely the phenomenon of strain lag, which causes the low utilization rate of the post-reinforcing material.
Disclosure of Invention
The embodiment of the application provides a reinforcing device and a reinforcing method for a concrete beam web plate, and aims to solve the problem that in the related art, the strength exertion degree of a post-reinforcing material is limited by the deformation of an original beam, so that the utilization rate of the post-reinforcing material is low.
In a first aspect, a reinforcing apparatus for a concrete beam web is provided, which includes:
the bearing beam is arranged on the beam body bottom plate, and the length of the bearing beam extends along the transverse bridge direction;
many interval arrangements's prestressing tendons, prestressing tendons one end anchor in on the carrier bar, with the stretch-draw the carrier bar is right vertical compressive stress is applyed to the roof beam body, and the other end is used for certainly roof beam body bottom plate runs through to roof beam body, and the anchor in roof beam body roof.
In some embodiments, the reinforcing device further includes a plurality of reinforcing plates, and the reinforcing plates are disposed between the carrier beam and the beam body bottom plate.
In some embodiments, the gap between two adjacent reinforcing plates is filled with filler.
In some embodiments, the reinforcing device further comprises a web-side concrete layer, wherein reinforcing ribs are embedded in the web-side concrete layer, the web-side concrete layer is used for being arranged on the web of the beam body, and the bottom end of the web-side concrete layer is borne on the bearing beam.
In some embodiments, the tendon is disposed substantially vertically when the tendon is inserted through the beam.
In a second aspect, a method for reinforcing a concrete beam web is provided, which includes the following steps:
a plurality of prestressed ducts penetrating through a bottom plate and a top plate of the beam body are arranged in the damaged area of the beam body;
a prestressed tendon is arranged in the prestressed duct in a penetrating way;
anchoring the bottom end of the prestressed tendon on a bearing beam, and hoisting the bearing beam to the beam body bottom plate;
and after tensioning the prestressed tendon to the designed load, anchoring the top end of the prestressed tendon to the roof of the beam body.
In some embodiments, before lifting the load beam to the beam body bottom plate, the method further comprises the following steps:
and a plurality of reinforcing plates are attached to the beam body bottom plate corresponding to the bearing beam.
In some embodiments, before lifting the load beam to the beam body bottom plate, the method further comprises the following steps:
and filling filler in the gap between two adjacent reinforcing plates.
In some embodiments, before tensioning the tendon to the design load, the method further comprises the following steps:
and pouring concrete on the web side wall of the beam body corresponding to the damaged area, and implanting reinforcing ribs into the concrete to form a web side concrete layer with the bottom end supported on the bearing beam.
In some embodiments, after tensioning the tendon to a design load and before anchoring the tendon top end to the beam roof, the method further comprises the steps of:
and pouring bar planting glue into the prestressed duct.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a reinforcing apparatus and a reinforcing method for a concrete beam web, the application penetrates a beam body with a prestressed tendon, and is anchored with a bearing beam under a beam body bottom plate, the bearing beam is tensioned to apply vertical compressive stress to the beam body, the application adopts a mode of applying vertical compressive stress to reinforce, and belongs to the active reinforcement category in the action principle.
This application adopts the mode of many prestressing tendons anchors on the carrier bar, can convert the point load into the equipartition load to make roof beam body reinforcing beam section atress even.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view illustrating a reinforcing apparatus for a web of a concrete beam according to an embodiment of the present disclosure when the reinforcing apparatus is used for reinforcing the web of the concrete beam;
FIG. 2 is a cross-sectional view taken at A-A in FIG. 1;
fig. 3 is a schematic view of the tendon anchored to the load-bearing beam according to the embodiment of the present disclosure;
fig. 4 is a cross-sectional view taken at B-B in fig. 3.
In the figure: 1. a load beam; 10. a connecting plate; 11. a cross beam; 12. a penetration space; 2. a beam body; 3. prestressed tendons; 4. a reinforcing plate; 5. a filler; 6. a web-side concrete layer; 7. a pre-stressed duct; 8. an anchor assembly; 80. an anchor plate; 81. and a nut.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a reinforcing apparatus of concrete beam body web to add reinforcing material intensity performance degree and receive former roof beam restriction of warping among the solution correlation technique after, lead to adding the problem that reinforcing material utilization rate is low after.
Referring to fig. 1 and 2, the reinforcing device for the web plate of the concrete beam body comprises a carrier beam 1 and a plurality of prestressed tendons 3 arranged at intervals, wherein the carrier beam 1 is used for being arranged on a bottom plate of the beam body 2, and the length of the carrier beam 1 extends along the transverse bridge direction; one end of the prestressed tendon 3 is anchored on the bearing beam 1 so as to stretch the bearing beam 1 to apply vertical compressive stress on the beam body 2, and the other end of the prestressed tendon is used for penetrating the beam body 2 from the bottom plate of the beam body 2 to the top plate of the beam body 2 and is anchored on the top plate of the beam body 2.
This application runs through the roof beam body 2 with prestressing tendons 3, and with the 1 anchor of roof beam 1 under the 2 bottom plates of roof beam body, through stretch-draw roof beam 1 in order to exert vertical compressive stress to the roof beam body 2, the reinforcement is consolidated to the mode that this application adopted to exert vertical compressive stress, belong to the initiative reinforcement category from the effect principle, because add reinforcing material initiative application of force after, the stress state of former roof beam body has been improved, thereby the purpose that has improved former roof beam bearing capacity and crack resistance has been reached, prevent concrete roof beam body web slant, the level continues to increase to the crack and makes the crack closed completely even, it adds reinforcing material "lag behind" drawback after having solved, it adds reinforcing material utilization ratio after improving.
This application adopts the mode of many prestressing tendons 3 anchors on carrier bar 1, can convert the point load into the equipartition load to make 2 reinforcing beam sections of roof beam body atress even.
Referring to fig. 1 and 2, in some preferred embodiments, the reinforcing device further includes a plurality of reinforcing plates 4, the reinforcing plates 4 are disposed between the load beam 1 and the bottom plate of the beam body 2, and during construction, the reinforcing plates 4 are adhered to the bottom plate of the beam body 2, and the reinforcing plates 4 may be steel plates or steel strips and are arranged along the longitudinal direction of the bridge.
Referring to fig. 1, in some preferred embodiments, the gap between two adjacent reinforcing plates 4 is filled with a filler 5. In the present embodiment, epoxy mastic is used as the filler 5.
Referring to fig. 1, in some preferred embodiments, the reinforcing device further comprises a web-side concrete layer 6, reinforcing ribs are embedded in the web-side concrete layer 6, the web-side concrete layer 6 is used for being arranged on the web of the beam body 2, and the bottom end of the web-side concrete layer 6 is borne on the load-bearing beam 1. The web side concrete layer 6 has the advantages that on one hand, the bearing capacity and rigidity of the beam body 2 are improved by increasing the section of the beam body 2 and adding reinforcing ribs; on the other hand, the condition that the vertical prestress loss is overlarge due to overlarge end deformation of the load-bearing beam 1 can be overcome. The web-side concrete layer 6 may be cast with a modified polymer concrete having a high strength micro-expansion characteristic.
Referring to fig. 1, in some preferred embodiments, when the tendon 3 is inserted into the beam 2, the tendon 3 is substantially vertically disposed so as to maximize the use of vertical prestress.
Referring to fig. 3 and 4, in some preferred embodiments, the load beam 1 includes a connecting plate 10 and two beams 11, the two beams 11 are spaced apart from each other and form a through space 12 between the two beams 11 for the tendon 3 to pass through, and the two beams 11 are fixedly connected by the connecting plate 10. The beam 11 is made of channel steel. Two channel-section steels set up back to back, and 3 vertical deviations of prestressing tendons that the clear distance between two channel-section steels guaranteed can pass when being no longer than 1%, and do not bump with the channel-section steel mutually. The two channel steels are carried out by arranging the connecting plate on the wing plate.
Referring to fig. 2, in some preferred embodiments, the tendon 3 is anchored to the load-bearing beam 1 by an anchoring assembly 8, the anchoring assembly 8 includes an anchor plate 80 and a nut 81, the anchor plate 80 is disposed on the tendon 3, and the nut 81 is screwed on the tendon 3 and is used for abutting against the anchor plate 80 so as to make the anchor plate 80 abut against the load-bearing beam 1.
Referring to fig. 1, in some preferred embodiments, the tendon 3 is anchored to the top plate of the beam 2 by an anchoring assembly 8, the anchoring assembly 8 includes an anchor plate 80 and a nut 81, the anchor plate 80 is disposed on the tendon 3, and the nut 81 is screwed on the tendon 3 and is used for abutting against the anchor plate 80 so that the anchor plate 80 abuts against the top plate of the beam 2.
Referring to fig. 1 and 2, the present application also provides a method for reinforcing a concrete beam web, including the steps of:
s1: and detecting the distribution position of the longitudinal prestressed steel strands in the main beam by adopting a geological radar, comparing a detection result with a design position, and judging whether the vertical prestressed position conflicts with the actual longitudinal steel strand position.
S2: after the position is determined, a geological drilling machine is adopted, and a plurality of prestressed ducts 7 penetrating through a bottom plate and a top plate of the beam body 2 are arranged in a damaged area of the beam body 2; the pre-stressed ducts 7 are as vertical as possible.
S3: the prestressed tendons 3 penetrate through the prestressed duct 7; the prestressed tendons 3 can adopt finish-rolled deformed steel bars.
S4: anchoring the bottom end of the prestressed tendon 3 on the carrier beam 1, and hoisting the carrier beam 1 to the bottom plate of the beam body 2;
s5: and after tensioning the prestressed tendon 3 to the designed load, anchoring the top end of the prestressed tendon 3 to the top plate of the beam body 2.
Referring to fig. 1, in some preferred embodiments, before hoisting the load beam 1 to the bottom plate of the beam body 2, the following steps are further included: a plurality of reinforcing plates 4 are attached to the bottom plate of the beam body 2 corresponding to the bearing beam 1.
Referring to fig. 1, in some preferred embodiments, before hoisting the load beam 1 to the bottom plate of the beam body 2, the following steps are further included: the gap between two adjacent reinforcing plates 4 is filled with filler 5.
Referring to fig. 1, in some preferred embodiments, before tensioning the tendon 3 to the design load, the method further includes the following steps: and pouring concrete on the web side wall of the beam body 2 corresponding to the damaged area, and implanting reinforcing ribs into the concrete to form a web side concrete layer 6 with the bottom end borne on the bearing beam 1.
In some preferred embodiments, after tensioning the tendon 3 to the design load and before anchoring the top end of the tendon 3 to the roof of the beam 2, the method further comprises the following steps: and (3) pouring bar planting glue into the prestressed duct 7. By adopting the method of pouring the bar-planting glue, the defect that the vertical prestress loss is overlarge due to the shrinkage of the grouting material caused by overlarge age difference between the grouting material and the beam concrete can be solved.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a reinforcing apparatus of concrete beam body web which characterized in that, it includes:
the bearing beam (1) is arranged on a bottom plate of the beam body (2), and the length of the bearing beam (1) extends along the transverse bridge direction;
many interval arrangements's prestressing tendons (3), prestressing tendons (3) one end anchor in on carrier bar (1), with the stretch-draw carrier bar (1) is right vertical compressive stress is applyed in roof beam body (2), the other end be used for certainly roof beam body (2) bottom plate runs through roof beam body (2) roof, and the anchor in roof beam body (2) roof.
2. A concrete beam web reinforcement as set forth in claim 1, wherein: the reinforcing device further comprises a plurality of reinforcing plates (4), and the reinforcing plates (4) are arranged between the bearing beam (1) and the bottom plate of the beam body (2).
3. A concrete beam web reinforcing apparatus as claimed in claim 2, wherein: and a filler (5) is filled in a gap between every two adjacent reinforcing plates (4).
4. A concrete beam web reinforcement as set forth in claim 1, wherein: the reinforcing device further comprises a web-side concrete layer (6), reinforcing ribs are implanted into the web-side concrete layer (6), the web-side concrete layer (6) is used for being arranged on a web of the beam body (2), and the bottom end of the web-side concrete layer (6) is borne on the bearing beam (1).
5. A concrete beam web reinforcement as set forth in claim 1, wherein: when the prestressed tendons (3) penetrate through the beam body (2), the prestressed tendons (3) are approximately vertically arranged.
6. A method for reinforcing a concrete beam web is characterized by comprising the following steps:
a plurality of prestressed ducts (7) penetrating through a bottom plate and a top plate of the beam body (2) are arranged in a damaged area of the beam body (2);
a prestressed tendon (3) is arranged in the prestressed duct (7) in a penetrating way;
anchoring the bottom end of the prestressed tendon (3) on a bearing beam (1), and hoisting the bearing beam (1) to a bottom plate of the beam body (2);
and after tensioning the prestressed tendon (3) to a design load, anchoring the top end of the prestressed tendon (3) to the roof of the beam body (2).
7. A method of reinforcing a concrete beam web according to claim 6, wherein before lifting said load beam (1) to said beam (2) deck, the method further comprises the steps of:
a plurality of reinforcing plates (4) are attached to the bottom plate of the beam body (2) corresponding to the bearing beam (1).
8. A method of reinforcing a concrete beam web according to claim 7, wherein before lifting said load beam (1) to said beam (2) deck, the method further comprises the steps of:
and filling filler (5) in the gap between two adjacent reinforcing plates (4).
9. A method of reinforcing a concrete beam web according to claim 6, wherein before said tendons (3) are tensioned to a design load, the method further comprises the steps of:
and pouring concrete on the web side wall of the beam body (2) corresponding to the damaged area, and implanting reinforcing ribs into the concrete to form a web side concrete layer (6) with the bottom end supported on the bearing beam (1).
10. A method of reinforcing a concrete beam web according to claim 6, wherein after tensioning said tendons (3) to a design load and before anchoring the top ends of said tendons (3) to the roof of said beam (2), the method further comprises the steps of:
and (3) pouring bar planting glue into the prestressed duct (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010261463.9A CN111395209A (en) | 2020-04-03 | 2020-04-03 | Reinforcing device and reinforcing method for concrete beam web |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010261463.9A CN111395209A (en) | 2020-04-03 | 2020-04-03 | Reinforcing device and reinforcing method for concrete beam web |
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| CN111395209A true CN111395209A (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922125A (en) * | 2022-05-07 | 2022-08-19 | 山东交通学院 | PC beam type bridge, and reinforcing device and method for PC beam type bridge |
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2020
- 2020-04-03 CN CN202010261463.9A patent/CN111395209A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922125A (en) * | 2022-05-07 | 2022-08-19 | 山东交通学院 | PC beam type bridge, and reinforcing device and method for PC beam type bridge |
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