CN110093868B - Hollow slab beam reinforcing method and hollow slab beam - Google Patents
Hollow slab beam reinforcing method and hollow slab beam Download PDFInfo
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- CN110093868B CN110093868B CN201910477687.0A CN201910477687A CN110093868B CN 110093868 B CN110093868 B CN 110093868B CN 201910477687 A CN201910477687 A CN 201910477687A CN 110093868 B CN110093868 B CN 110093868B
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 79
- 239000012779 reinforcing material Substances 0.000 claims abstract description 68
- 238000010276 construction Methods 0.000 claims abstract description 60
- 238000010008 shearing Methods 0.000 claims abstract description 55
- 230000002787 reinforcement Effects 0.000 claims abstract description 45
- 239000007787 solid Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000009415 formwork Methods 0.000 claims description 13
- 238000002513 implantation Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 239000011381 foam concrete Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 238000001839 endoscopy Methods 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 17
- 239000002699 waste material Substances 0.000 description 10
- 239000004567 concrete Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
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- 238000007689 inspection Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of bridge reinforcement, in particular to a hollow slab beam reinforcement method. The method comprises the following steps: s1: determining a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam; s2: at least one construction hole is drilled at the position of the area with insufficient shearing bearing capacity, so that the hollow slab beam cavity is communicated with the construction hole; s3: filling side mold materials into the cavity of the hollow slab beam through the construction holes to form a side mold plate, wherein the side mold plate separates the area with insufficient shearing bearing capacity from the area with meeting shearing bearing capacity; s4: and filling reinforcing materials into the cavities in the areas with insufficient shear capacity to form solid reinforcing bodies. The construction hole can guarantee that the reinforcing material gets into in the cavity, and the side direction template can prevent that the reinforcing material from cutting the bearing capacity not enough region flow direction from cutting the bearing capacity and meeting the region, saves the reinforcing material quantity, reduces maintenance reinforcement cost, prevents that hollow slab beam dead weight from increasing too greatly, influences the bearing capacity of bridge substructure.
Description
Technical Field
The invention relates to the technical field of bridge reinforcement, in particular to a hollow slab beam reinforcement method and a hollow slab beam.
Background
The prefabricated common (or prestressed) concrete hollow slab beam has higher use proportion in the middle-small span bridge because of the advantages of factory rapid manufacturing, simple process and the like. Because of the technical defects in the aspects of materials, design, construction process and the like, the operation period is influenced by factors such as overload vehicles and the like, and the problem of insufficient shearing bearing capacity such as oblique cracks and the like at the end part of a common (or prestressed) concrete hollow slab beam in service in early construction in China is solved. For the common (or prestressed) concrete hollow slab beam, if the dismantling reconstruction is directly carried out, the common (or prestressed) concrete hollow slab beam is not only a resource waste, but also needs to interrupt traffic, and has high cost and long construction period. Particularly, if the bridge spans special structures, such as railways, military facilities and the like, the difficulty of dismantling and rebuilding is higher, the cost is higher, and the construction period is longer. The existing common old hollow slab beam bridge reinforcement method also has the method for avoiding dismantling and rebuilding, such as a bridge deck thickening reinforcement method, a pasting reinforcement method, an external prestress reinforcement method, a structure system change reinforcement method and the like, but has limitations, such as the problems of bonding effect and durability of reinforcement materials and base materials in the process of pasting steel plates and fiber composite materials; the external prestress and the system reinforcement method are changed to have a plurality of problems of complex reinforcement process and the like.
Therefore, there is a need for a method of reinforcing a hollow slab beam to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a hollow plate beam reinforcing method and a hollow plate beam, which can be used for reinforcing a hollow plate in situ under the condition of not disassembling the hollow plate beam and are simple in processing technology.
To achieve the purpose, the invention adopts the following technical scheme:
The method for reinforcing the hollow slab beam comprises the following steps:
S1: determining a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam;
S2: at least one construction hole is drilled at the position of the area with insufficient shearing bearing capacity, so that the hollow slab beam cavity is communicated with the construction hole;
S3: filling side mold materials into the cavity of the hollow slab beam through the construction holes to form a side mold plate, wherein the side mold plate separates the area with insufficient shearing bearing capacity from the area with meeting shearing bearing capacity;
s4: the cavity of the area with insufficient shearing resistance is filled with reinforcing material to form a reinforcing body.
As a preferable technical scheme of the hollow slab beam reinforcement method, before step S4, the method further includes: reinforcing steel bars are vertically implanted in the areas with insufficient shearing bearing capacity of the hollow plate beams.
As a preferable technical scheme of the hollow slab beam reinforcement method, the steel bars are implanted into the hollow slab beam from the top or the bottom of the hollow slab beam.
As a preferable technical scheme of the hollow slab beam reinforcement method, before the reinforcement is implanted, a reinforcement implantation hole is drilled in the hollow slab beam, and the reinforcement is anchored in the reinforcement implantation hole through reinforcement implantation glue.
As a preferable technical scheme of the hollow slab beam reinforcement method, the method further comprises the step of installing a pouring pipe and an exhaust pipe in the construction holes after the step S2, wherein each construction hole is internally provided with a pouring pipe or an exhaust pipe, and the pouring pipe comprises a lateral template pouring pipe and a reinforcement material pouring pipe.
As a preferable technical scheme of the hollow slab beam reinforcement method, after step S3, the method further includes: the endoscope is extended into the hollow slab beam cavity through the construction hole.
As a preferable technical scheme of the hollow slab beam reinforcement method, the side mold material is polyurethane foam material or cement-based grouting material or foam concrete.
As a preferable technical scheme of the hollow slab beam reinforcing method, the reinforcing material is polyurethane foaming material or cement-based grouting material or foam concrete.
The invention also provides a hollow slab beam, which is obtained by the hollow slab beam reinforcing method, and is characterized by comprising a hollow slab body, wherein a plurality of construction holes are formed in the hollow slab body, the central axes of the construction holes are vertical or inclined relative to the central axes of cavities of the hollow slab body, lateral templates and reinforcing structures are arranged in the cavities, plug boards are respectively arranged at two ends of the cavities, and the reinforcing structures are tightly attached to one sides of the lateral templates.
As a preferable technical scheme of the hollow slab beam, the number of the lateral templates is two, the two lateral templates divide the cavity into a reinforced area and a non-reinforced area, and the non-reinforced area is positioned between the reinforced areas.
As a preferable technical solution of the hollow slab beam, the reinforcing structure comprises steel bars and a formed reinforcing body.
As a preferable technical scheme of the hollow slab beam, the length of the reinforcing steel bar penetrating into the top plate or the bottom plate is more than 5cm.
As a preferable technical scheme of the hollow slab beam, the hollow slab body is provided with a plurality of bar planting holes, and the steel bars penetrate into the bar planting holes.
As a preferable technical scheme of the hollow slab beam, the construction hole comprises a lateral template material pouring hole, a reinforcing material pouring hole, an exhaust hole and an endoscope inspection hole, wherein the lateral template material pouring hole, the reinforcing material pouring hole, the exhaust hole and the endoscope inspection hole are positioned on the same side of the hollow slab body, and the lateral template material pouring hole is positioned between two lateral templates.
As a preferable technical scheme of the hollow slab beam, the central axis of the lateral template material pouring hole is inclined relative to the central axis of the exhaust hole, and the central axis of the exhaust hole is perpendicular to the central axis of the cavity of the hollow slab body.
As a preferable technical scheme of the hollow slab beam, the central axis of the lateral template material pouring hole and the central axis of the exhaust hole are perpendicular to the central axis of the cavity of the hollow slab body.
As a preferable technical scheme of the hollow slab beam, the thickness of the lateral formwork is 30cm-50cm.
The invention has the beneficial effects that:
According to the hollow slab beam reinforcing method provided by the invention, the shear capacity insufficient area and the shear capacity meeting area of the hollow slab beam are determined through theoretical analysis or experiments, the position of the hollow slab beam to be reinforced is determined, lateral templates are arranged between the shear capacity insufficient area and the shear capacity meeting area to separate, the construction holes can ensure that reinforcing materials enter the cavity, the reinforcing materials are filled in the shear capacity insufficient area, the lateral templates can prevent the reinforcing materials from flowing from the shear capacity insufficient area to the shear capacity meeting area, the consumption of the reinforcing materials is saved, the maintenance and reinforcing cost is reduced, and the overgreat increase of dead weight of the hollow slab beam is prevented from influencing the bearing capacity of the lower structure of the bridge. More importantly, the constraint of the lateral templates can ensure that the reinforcing materials filled in the cavity are densely filled, and the shearing bearing capacity of the reinforcing materials is fully exerted. .
According to the hollow plate girder reinforcing method, the reinforcing material is filled in the hollow cavity area with insufficient shear bearing capacity, so that the shear bearing capacity of the hollow plate girder can be improved, huge waste of dismantling and reconstruction is avoided, and the hollow plate girder reinforcing method has good social and economic benefits. The method does not change the appearance of the hollow slab beam, the clearance under the bridge and the stress system of the bridge structure.
According to the hollow slab beam provided by the invention, the reinforcing body is arranged in the reinforcing area in the hollow slab body, so that the shearing bearing capacity of the hollow slab body can be improved, and the huge waste of dismantling and rebuilding the hollow slab body in service is avoided.
Drawings
FIG. 1 is a flow chart of a method for reinforcing a hollow slab beam according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for reinforcing a hollow slab beam according to a second embodiment of the present invention;
Figure 3 is a schematic view of the structure of the hollow slab beam provided in the second embodiment of the present invention after drilling a construction hole,
Fig. 4 is a schematic structural view of a hollow slab beam according to a second embodiment of the present invention after being inserted into a filling pipe and an exhaust pipe;
FIG. 5 is a schematic view of a hollow slab beam inner poured side mold material according to a second embodiment of the present invention;
fig. 6 is a schematic structural view of a hollow slab beam according to a second embodiment of the present invention after a reinforcing steel bar is embedded in the hollow slab beam;
Fig. 7 is a schematic structural diagram of a second embodiment of the present invention after pouring reinforcing material into a region with insufficient shear capacity;
FIG. 8 is a flow chart of a method of reinforcing a hollow slab beam provided in accordance with a third embodiment of the present invention;
figure 9 is a schematic view of the structure of the hollow slab beam provided in the third embodiment of the present invention after drilling a construction hole,
Fig. 10 is a schematic view of a hollow slab beam according to a third embodiment of the present invention after being inserted into a filling pipe and an exhaust pipe;
FIG. 11 is a schematic view of a hollow slab beam inner poured side mold material according to a third embodiment of the present invention;
Fig. 12 is a schematic structural view of a hollow slab beam according to a third embodiment of the present invention after a reinforcing steel bar is embedded in the hollow slab beam;
FIG. 13 is a schematic view of a structure of a third embodiment of the present invention after pouring reinforcing material into an area with insufficient shear capacity;
fig. 14 is a schematic structural view of a hollow slab beam provided in a fourth embodiment of the present invention.
In the figure:
1. a hollow slab body; 2. a lateral template; 3. a reinforcing structure; 4. reinforcing steel bars; 5. a lateral template material pouring hole; 6. pouring the reinforcing material into the holes; 7. an exhaust hole; 8. an endoscopic aperture; 9. a lateral template perfusion tube; 10. pouring a reinforcing material into the tube; 11. an exhaust pipe; 12. and a blanking plate.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Example 1
The invention provides a hollow slab beam reinforcing method, which converts a cavity section of a hollow slab beam into a solid section, and adds reinforcing materials from the cavity, thereby improving the shear bearing capacity of the hollow slab beam.
Fig. 1 is a flowchart of a method for reinforcing a hollow slab beam according to the present invention, as shown in fig. 1, the method includes the steps of:
s1: and determining the insufficient shear bearing capacity area and the meeting area of the shear bearing capacity of the hollow slab beam.
According to parameters such as bridge construction, design vehicle load and the like, a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam are determined through methods such as calculation, analysis or experiments, wherein the region with insufficient shear bearing capacity is a range in which the shear bearing capacity needs to be reinforced, and the region is generally positioned near a beam end.
S2: at least one construction hole is drilled at the position of the area with insufficient shearing bearing capacity, so that the hollow slab beam cavity is communicated with the construction hole;
The purpose of boring the construction hole in the insufficient bearing capacity of shearing department is in order to pack the reinforcement material, makes the cavity in the hollow slab beam by partial filling reinforcement, realizes the purpose that need not dismantle to current hollow slab beam of serving can consolidate, and wherein the effect of construction hole is not only to pack the reinforcement material, and when the construction hole is a plurality of, one of them construction hole then is used for observing whether the side form material in the cavity separates the cavity to and the compactness of the side form that forms. One of the construction holes is used as an exhaust hole, so that the hollow slab beam cavity is convenient to be identical with the external air pressure, the side die material and the reinforcing material can flow, and meanwhile, the construction hole is also used for observing whether the reinforcing material is completely filled in the area with insufficient shearing bearing capacity.
S3: filling side mold materials into the cavity of the hollow slab beam through the construction holes to form a side mold plate, wherein the side mold plate separates the area with insufficient shearing bearing capacity from the area with meeting shearing bearing capacity;
the lateral templates separate the areas with insufficient shearing bearing capacity from the areas with meeting shearing bearing capacity, so that reinforcing materials are not filled in the areas with meeting shearing bearing capacity in the subsequent steps, and the hollow slab beam is prevented from excessively increasing dead weight to influence the bearing capacity of the lower structure of the bridge. Meanwhile, the lateral templates separate the areas with insufficient shearing bearing capacity from the areas with sufficient shearing bearing capacity, so that filled reinforcing materials can be saved, the reinforcing materials can be filled only in the areas with insufficient shearing bearing capacity, and unnecessary waste is avoided. More importantly, the constraint of the lateral templates can ensure that the reinforcing materials filled in the cavity are densely filled, and the shearing bearing capacity of the reinforcing materials can be fully exerted after the reinforcing materials are solidified.
S4: the cavity of the area with insufficient shearing resistance is filled with reinforcing material to form a reinforcing body.
Because the shearing bearing capacity insufficient area and the shearing bearing capacity meeting area corresponding to the cavity are separated in the S3, when the reinforcing material is filled, the reinforcing material does not need to worry about flowing from the shearing bearing capacity insufficient area to the shearing bearing capacity meeting area, the effective utilization of the material is ensured, the material is not wasted, and the weight increase of the hollow slab beam can be effectively prevented, and the bearing capacity of the lower structure of the bridge is influenced.
According to the hollow slab beam reinforcing method provided by the embodiment, the position where the hollow slab beam needs to be reinforced is determined by determining the shear capacity insufficient area and the shear capacity meeting area of the hollow slab beam, lateral templates are arranged between the shear capacity insufficient area and the shear capacity meeting area to separate, the construction holes can ensure that reinforcing materials enter the cavity, reinforcing materials are filled in the cavity of the shear capacity insufficient area, the lateral templates can prevent the reinforcing materials from flowing from the shear capacity insufficient area to the shear capacity meeting area, and the dead weight of the hollow slab beam is prevented from increasing too much and affecting the bearing capacity of the bridge substructure.
According to the hollow plate girder reinforcing method, the reinforcing material is filled in the cavity of the area with insufficient shear bearing capacity, so that the shear bearing capacity of the hollow plate girder can be improved, huge waste of dismantling and reconstruction is avoided, and better social and economic benefits are achieved. The method does not change the appearance of the hollow slab beam, the clearance under the bridge and the stress system of the bridge structure.
Example two
Fig. 2 is a flowchart of a method for reinforcing a hollow slab beam according to an embodiment of the present invention, and as shown in fig. 2, a method for reinforcing a hollow slab beam is provided in this embodiment, which is mainly used for reinforcing a hollow slab beam already in service in a bridge.
In comparison with the first embodiment, the main steps of the hollow slab beam reinforcement method of the present embodiment are the same as those of the first embodiment, and only the further specific limitation of the step S2 in the first embodiment is provided. The embodiment is mainly used for specifically describing a hollow slab beam reinforcing method under the condition that bridge deck traffic can be interrupted.
Fig. 3 is a schematic structural view of the hollow center plate beam of the present embodiment after drilling a construction hole, and fig. 4 is a schematic structural view of the hollow center plate beam of the present embodiment after inserting the filling pipe and the exhaust pipe 11; FIG. 5 is a schematic view of the structure of the hollow center plate beam of the present embodiment with side mold material poured therein; fig. 6 is a schematic structural view of the hollow slab beam according to the present embodiment after the steel bars 4 are implanted therein; fig. 7 is a schematic structural diagram of the embodiment after pouring the reinforcing material into the cavity in the area with insufficient shear capacity.
As shown in fig. 2 to 7, the method for reinforcing a hollow slab beam provided in this embodiment mainly includes the following steps:
S1: determining a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam;
S2: eight construction holes are drilled in the top plate of the hollow plate girder from top to bottom, and the drilled holes penetrate through the top plate, wherein two construction holes are drilled in the region with the shearing bearing capacity meeting the requirement, and six construction holes are drilled in the region with the insufficient shearing bearing capacity;
s21: installing a pouring pipe and an exhaust pipe 11 in the construction holes, and installing a pouring pipe or an exhaust pipe 11 in each construction hole;
S3: a side template 2 is formed by pouring side template materials into a cavity of a hollow slab beam through a construction hole positioned in a shearing bearing capacity meeting area, and the side template 2 separates the shearing bearing capacity insufficient area from the shearing bearing capacity meeting area;
S31: extending an endoscope into a construction hole positioned in the area with insufficient shearing bearing capacity;
s32: drilling a bar planting hole at the position of the hollow slab beam with insufficient shearing bearing capacity;
S33: the steel bar 4 is implanted in the steel bar implantation hole;
s4: and filling reinforcing materials into the cavity of the area with insufficient shearing bearing capacity of the implanted steel bar 4 to form the reinforcing structure 3.
In this embodiment, in order to facilitate the implantation of the reinforcing steel bars 4 into the hollow plate beam, before the implantation of the reinforcing steel bars 4, the reinforcing steel bar implantation holes need to be drilled at the positions of the hollow plate beam where the shearing bearing capacity is insufficient, and the reinforcing steel bars 4 are anchored in the reinforcing steel bar implantation holes through reinforcing steel bar implantation glue.
Because the top plate is downwards drilled into the bar planting hole from the upper surface and penetrates to the bottom plate of the hollow plate, the depth of the bar planting hole on the bottom plate is 5cm, and the bar planting hole on the bottom plate is used for fixing the steel bar 4, so that one end of the steel bar 4 is prevented from being shifted along with the flowing direction of the reinforcing material when the reinforcing material is poured. In this embodiment, the number and types of the reinforcing bars 4 are determined by the target value for improving the shearing load-bearing capacity, and the present embodiment is not particularly limited.
The pouring pipes include a lateral template pouring pipe 9 and a reinforcement material pouring pipe 10. The construction hole comprises a lateral template material pouring hole 5, a reinforcing material pouring hole 6, an exhaust hole 7 and an endoscope inspection hole 8, wherein the lateral template material pouring hole 5 is positioned in a shearing bearing capacity meeting area, a lateral template material pouring pipe 9 is inserted into the lateral template material pouring hole 5, so that a lateral template material can conveniently enter a cavity from the lateral template material pouring hole 5, and the lateral template material enters the cavity. It should be noted that, the hardened side mold material should be completely adhered and bonded to the cavity side wall of the cavity of the hollow slab, and the length is controlled to be 30 cm-50 cm, and this limitation can ensure that the side mold plate 2 is formed and then effectively blocks the reinforcing material, so as to prevent the reinforcing material from entering the shear bearing capacity meeting area through the gap between the side mold plate 2 and the cavity side wall of the cavity of the hollow slab, the reinforcing material pouring tube 10 is inserted into the reinforcing material pouring hole 6, and the reinforcing material enters the cavity through the reinforcing material pouring tube 10, because the reinforcing material is cement-based grouting material, polyurethane material, lightweight foam concrete, or the like, and therefore, the reinforcing material needs to be guided by the reinforcing material pouring tube 10 to enter the designated area of the hollow slab.
The endoscope examination hole 8 is used for extending the endoscope into the hollow slab cavity, and the endoscope is used for guiding and controlling the pouring process in the process of pouring the side mold material, so that the poured side mold material can be tightly adhered to the inner wall of the hollow slab beam. After the side mold material is filled and hardened to form the side mold plate 2, the compactness of the hardened side mold material is checked by an endoscope through the endoscope examination hole 8, if the side mold plate 2 meets the requirement, the subsequent step is carried out, and if the side mold plate 2 does not meet the requirement, the side mold material is continuously filled to repair the side mold plate 2.
The vent 7 is used to remove air from the cavity when filling the cavity with the reinforcing material, and to stop the pouring operation when the reinforcing material overflows from the vent 7, which indicates that the cavity is filled with the reinforcing material. Therefore, the vent hole 7 is not only used for venting, but also can judge whether the cavity is filled with the reinforcing material, so that the reinforcing material can be used for tightly filling the cavity. It should be noted that, the exhaust pipe 11 should be inserted into the exhaust hole 7, and the mouth of the exhaust pipe 11 should be 20cm above the highest point of the cavity grouting area of the hollow plate beam. Stopping construction after the exhaust hole 7 emerges the poured reinforcing material, and sealing all holes (i.e. the reinforcement holes and the construction holes).
After the hollow slab beam is reinforced, the cross section is filled with the hollow material to be solid, the change of the shearing resistance bearing capacity at the shearing resistance bearing capacity insufficient area is shown in tables 1 and 2, and in the embodiment, the spans of 10m, 13m, 16m and 20m are selected for the test. In the table 1, only the hollow slab beam cavity is filled to be solid, and the cavity has no shear bearing capacity of vertical bar planting. Table 2 is the shear load capacity of not only filling the hollow slab beam cavity as solid, but also having vertical bar planting in the cavity.
TABLE 1 shear carrying Capacity at areas where the shear carrying Capacity is insufficient (Unit: KN) before reinforcing the pre-hollow plate girder
Table 2 hollow slab beams reinforce the shear carrying capacity (Unit: KN) at areas where the front and rear shear carrying capacities are insufficient
As can be seen from table 1 and table 2, the shear bearing capacity of the hollow plate girder is improved by using the method, the shear bearing capacity of the hollow plate girder is improved by 10% -25% only when the hollow plate girder cavity is filled with the solid hollow plate girder, and the shear bearing capacity of the hollow plate girder cavity is improved by 20% -45% when the hollow plate girder cavity is filled with the solid hollow plate girder and the reinforcing steel bars 4 are added.
The data of the same bridge before reinforcement and the data of the same bridge after reinforcement are compared, and the shear bearing capacity of the hollow slab beam is improved by 20% -45% relative to that of the hollow slab beam after reinforcement before reinforcement, so that huge waste of dismantling and reconstruction is avoided, and the hollow slab beam has good social and economic benefits. Meanwhile, the method is easy to operate, has low requirement on the level of operators, and can save labor cost.
Example III
Fig. 8 is a flowchart of a method for reinforcing a hollow slab beam according to an embodiment of the present invention, and as shown in fig. 8, a method for reinforcing a hollow slab beam is provided in this embodiment, which is mainly used for reinforcing a hollow slab beam already in service in a bridge.
In comparison with the embodiment, the main steps of the hollow slab beam reinforcement method in this embodiment are the same as those in the embodiment, and only the further specific limitation of step S2 in the first embodiment is provided. The embodiment is mainly used for specifically describing a hollow slab beam reinforcing method under the condition that bridge deck traffic cannot be interrupted.
Fig. 9 is a schematic structural view of the hollow center plate beam of the present embodiment after drilling a construction hole, and fig. 10 is a schematic structural view of the hollow center plate beam of the present embodiment after inserting a filling pipe and an exhaust pipe 11; FIG. 11 is a schematic view of the structure of the hollow center plate beam of the present embodiment with side mold material poured therein; fig. 12 is a schematic structural view of the hollow slab beam according to the present embodiment after the steel bars 4 are implanted therein; fig. 13 is a schematic structural view of the present embodiment after pouring reinforcing material into the shear-resistant bearing capacity insufficient area.
As shown in fig. 8 to 13, the method for reinforcing a hollow slab beam provided in this embodiment mainly includes the following steps:
S1: determining a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam;
S2: eight construction holes are drilled on the bottom plate of the hollow plate girder from bottom to top, the drilled holes penetrate through the bottom plate to be communicated with the cavity, wherein the shearing bearing capacity meets the requirement of two construction holes drilled in the region, and six construction holes are drilled in the region with insufficient shearing bearing capacity;
s21: installing a pouring pipe and an exhaust pipe 11 in the construction holes, and installing a pouring pipe or an exhaust pipe 11 in each construction hole;
S3: a side template 2 is formed by pouring side template materials into a cavity of a hollow slab beam through a construction hole positioned in a shearing bearing capacity meeting area, and the side template 2 separates the shearing bearing capacity insufficient area from the shearing bearing capacity meeting area;
S31: extending an endoscope into a construction hole positioned in the area with insufficient shearing bearing capacity;
s32: drilling a bar planting hole at the position of the hollow slab beam with insufficient shearing bearing capacity;
S33: the steel bar 4 is implanted in the steel bar implantation hole;
s4: and filling reinforcing materials into the cavity of the area with insufficient shearing bearing capacity of the implanted steel bar 4 to form the reinforcing structure 3.
The data of the same bridge before reinforcement and the data of the same bridge after reinforcement are compared, and the shear bearing capacity of the hollow slab beam is improved by 20% -45% relative to that of the hollow slab beam after reinforcement before reinforcement, so that huge waste of dismantling and reconstruction is avoided, and the hollow slab beam has good social and economic benefits. Meanwhile, the method is easy to operate, and the hollow slab beam can be reinforced without traffic blockage.
Other steps are the same as those of the embodiment, and are not described herein.
Example IV
The embodiment provides a hollow slab beam, fills reinforcing material as required in the cavity, makes hollow slab beam shear bearing capacity improve, is providing the condition of hollow slab beam shear bearing capacity, and the whole weight increase of hollow slab beam is less, can not cause great bearing burden to the structure of hollow slab beam lower part, and this kind of structure can save reinforcing material simultaneously.
Fig. 14 is a schematic structural view of a hollow slab beam provided in this embodiment, and as shown in fig. 14, the hollow slab beam provided in this embodiment is obtained by the hollow slab beam reinforcing method in the first embodiment, the second embodiment or the third embodiment, wherein the hollow slab beam includes a hollow slab body 1, a cavity of the vertical hollow slab body 1, a plurality of construction holes are provided on the hollow slab body 1, a lateral formwork 2 and a reinforcing structure 3 are provided in the cavity, two end of the cavity are respectively provided with a blanking plug 12 to plug two ends of the cavity, the reinforcing structure 3 contacts one side of the lateral formwork 2, and the other end contacts the blanking plug 12.
In this embodiment, since the area with insufficient shear capacity of the hollow slab beam is located near the beam end, in order to prevent the reinforcing material from entering the area with sufficient shear capacity of the hollow slab beam when not being solidified, the hollow cavity needs to be partitioned, and in this embodiment, the hollow cavity is preferably partitioned by the lateral formwork 2, which results in waste of the reinforcing material and excessive increase of the dead weight of the reinforced hollow slab beam. Specifically, in this embodiment, the number of the lateral templates 2 is two, and the two lateral templates 2 divide the cavity into a reinforced area and a non-reinforced area, and the reinforcing structure 3 is disposed in the reinforced area. Of course, in other embodiments, the number of the lateral templates 2 is not limited to two, but one or three or more, the lateral templates 2 are tightly attached to the side walls of the cavity, so that the reinforced material can be prevented from flowing into the non-reinforced area from the gap between the lateral templates 2 and the side walls of the cavity, the waste of the reinforced material is caused, and meanwhile, the problem that the overall weight of the hollow slab body 1 is increased greatly, and the bearing burden of the bridge substructure below the hollow slab body 1 is obviously improved can be prevented.
Preferably, the reinforcing structure 3 in this embodiment preferably comprises steel bars 4 and formed concrete blocks. The reinforcing steel bars 4 are combined with the formed reinforcing body, the reinforcing steel bars 4 are positioned in the formed reinforcing body, and the reinforcing steel bars and the formed reinforcing body are tightly connected with each other, so that the shear strength of the hollow slab beam can be improved. Of course, in other embodiments the reinforcing structure 3 may also comprise only reinforcing bodies.
In order to fix the reinforcing steel bars 4 in the hollow slab body 1, the position deviation cannot occur in the manufacturing process of the hollow slab beam when concrete is poured, and the depth of the reinforcing steel bars 4 implanted into the bottom plate or the top plate is larger than 5cm in the embodiment. In this embodiment, a plurality of bar planting holes are formed in the hollow plate body 1, the bar planting hole central axis is parallel to the construction hole central axis, and the bar planting hole central axis is inclined relative to the construction hole central axis, and the steel bars 4 are planted in the bar planting holes. When the bar planting hole is formed from the top plate of the hollow plate body 1 to the bottom (under the condition of broken traffic), the length of the bottom plate implanted in the lower end of the steel bar 4 is larger than 5cm, when the bar planting hole is formed from the bottom plate of the hollow plate body 1 to the top (under the condition of unbroken traffic), the length of the upper end of the steel bar 4 penetrating into the top plate is larger than 5cm, and in the embodiment, the length of the lower end of the steel bar 4 penetrating into the bottom plate or the length of the upper end of the steel bar 4 penetrating into the top plate is 5cm. Meanwhile, the steel bars 4 are anchored in the bar planting holes through bar planting glue.
In order to facilitate the processing of the hollow slab body 1, the construction holes include a lateral formwork material pouring hole 5, a reinforcement material pouring hole 6, an exhaust hole 7 and an endoscope hole 8, and the lateral formwork material pouring hole 5, the reinforcement material pouring hole 6, the exhaust hole 7 and the endoscope hole 8 are located at the same side of the hollow slab body 1 (i.e., the bottom of the hollow slab body 1). Wherein the lateral template material pouring holes 5 are located between two lateral templates 2, i.e. the lateral template material pouring holes 5 are located in non-reinforced areas. It should be noted that, after the reinforcement construction is completed, the lateral template material pouring hole 5, the reinforcement material pouring hole 6, the exhaust hole 7, the endoscopy hole 8 and the bar planting hole should be plugged to prevent rainwater from entering the hollow plate body 1 to cause corrosion of other structures (such as the steel bars 4) of the hollow plate body 1. Wherein, the plugging material of the construction hole can be a concrete material.
Because the hollow slab body 1 is of an existing structure, in order not to damage the self structure of the hollow slab body 1, the lateral formwork 2 is formed by solidifying a side formwork material with fluidity, and in order to enable the side formwork material to be located in a designated area after being poured, in this embodiment, it is preferable that the central axis of the pouring hole 5 of the lateral formwork material is inclined relative to the central axis of the air vent 7, and the central axis of the air vent 7 is perpendicular to the central axis of the cavity. Of course, in other embodiments the lateral template material pouring aperture 5 central axis and the vent aperture 7 central axis are both perpendicular to the cavity central axis. In this embodiment, the number of the lateral template material pouring holes 5 is two, and the two lateral template material pouring holes 5 are symmetrically arranged, and this arrangement can facilitate the formation of the lateral templates 2 on both sides. Of course, in other embodiments, the number of the lateral template material pouring holes 5 is not limited to two, and the number of the lateral template material pouring holes 5 is determined according to the requirements of the construction process.
According to the hollow slab beam provided by the embodiment, as the reinforcing body is arranged in the reinforcing area of the hollow slab body 1, the shear bearing capacity of the hollow slab body 1 can be improved, the huge waste that the hollow slab body 1 in service is dismantled and rebuilt because the strength requirement is not met is avoided, and as the hollow slab body 1 is only provided with the reinforcing body in the reinforcing area, the appearance of the hollow slab body 1 in service cannot be changed, and meanwhile, the hollow slab body 1 can be reinforced without being dismantled from a bridge.
Furthermore, the foregoing description of the preferred embodiments and the principles of the invention is provided herein. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. The hollow slab beam reinforcing method is characterized by comprising the following steps of:
S1: determining a region with insufficient shear bearing capacity and a region with satisfied shear bearing capacity of the hollow slab beam;
S2: drilling eight construction holes on a top plate or a bottom plate of the hollow plate girder so that the hollow plate girder cavity is communicated with the construction holes; the eight construction holes are two lateral template material pouring holes (5), two reinforcing material pouring holes (6), two exhaust holes (7) and two endoscopy holes (8); wherein the two lateral template material pouring holes (5) are positioned in the region with the meeting of the shearing bearing capacity, and the two reinforcement material pouring holes (6), the two exhaust holes (7) and the two endoscopy holes (8) are positioned in the region with the insufficient shearing bearing capacity;
S3: a lateral template (2) is formed by pouring a lateral template material into a cavity of the hollow slab beam through the lateral template material pouring holes (5), and the lateral template (2) separates a region with insufficient shearing bearing capacity from a region with meeting shearing bearing capacity;
S4: filling reinforcing materials into the cavity of the area with insufficient shearing bearing capacity to form a solid reinforcing body;
The side mold material is polyurethane foam material or cement-based grouting material or foam concrete, the side mold material poured into the hollow slab beam cavity is completely closely adhered and bonded with the cavity side wall of the hollow slab beam cavity after being hardened, and the side mold plate (2) can prevent the reinforcing material from entering the shear bearing capacity meeting area through a gap between the side mold plate (2) and the cavity side wall of the hollow slab beam cavity after being formed;
The method further comprises the following steps before the step S4: the hollow slab beam is vertically implanted with steel bars (4) in the area with insufficient shearing bearing capacity;
The steel bars (4) are implanted into the hollow plate girder from the top or the bottom of the hollow plate girder.
2. The method for reinforcing the hollow plate girder according to claim 1, wherein before the steel bar (4) is implanted, a bar implantation hole is drilled on the hollow plate girder, and the steel bar (4) is anchored in the bar implantation hole through bar implantation glue.
3. The method of reinforcing a hollow slab beam according to claim 1, further comprising, after step S2, installing a pouring tube in the lateral formwork material pouring holes (5) and the reinforcing material pouring holes (6), installing an exhaust tube (11) in the exhaust holes (7), installing one pouring tube in each of the lateral formwork material pouring holes (5) and the reinforcing material pouring holes (6), and installing one exhaust tube (11) in each of the exhaust holes (7), the pouring tubes including a lateral formwork pouring tube (9) and a reinforcing material pouring tube (10).
4. The method of reinforcing a hollow slab beam according to claim 1, further comprising, after step S3: the endoscope is inserted into the hollow slab beam cavity through the endoscope examination hole (8).
5. The method of reinforcing a hollow slab beam according to claim 1, wherein the reinforcing material is a polyurethane foam material or a cement-based grouting material or foam concrete.
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| CN110748185A (en) * | 2019-10-25 | 2020-02-04 | 中国林业科学研究院木材工业研究所 | In-situ bar planting pouring and reinforcing method for partially rotten ancient building wood beam |
| CN111364374A (en) * | 2020-03-16 | 2020-07-03 | 南京林业大学 | Shear-resistant reinforcing method for small-section hollow beam |
| CN111608093B (en) * | 2020-05-21 | 2021-03-09 | 南京梦联桥传感科技有限公司 | Shear-resistant reinforcing method for hollow plate beam based on high-performance composite material |
| CN114934454B (en) * | 2022-06-29 | 2023-08-15 | 山西省交通新技术发展有限公司 | Reusable air core plugging template for shear reinforcement of hollow concrete beam |
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| CN210151599U (en) * | 2019-06-03 | 2020-03-17 | 南京博瑞吉工程技术有限公司 | Hollow slab beam |
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| JP5822379B2 (en) * | 2011-05-10 | 2015-11-24 | 株式会社ケー・エフ・シー | Repair method for hollow slab |
| CN107386132B (en) * | 2017-06-13 | 2019-11-15 | 周劲宇 | Implement the hollow slab bridge reinforcement means and hollow slab bridge of laterally folder connection enhancing to bottom plate |
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| CN108103959A (en) * | 2017-11-10 | 2018-06-01 | 南京市交通工程质量监督站 | A kind of hollow slab girder shear-carrying capacity method for improving |
| CN109653106A (en) * | 2019-01-03 | 2019-04-19 | 济南城建集团有限公司 | City overhead road prestressed cored slab end web inclined crack Disease Processing technology |
| CN109811667A (en) * | 2019-03-08 | 2019-05-28 | 山东建筑大学 | A kind of reinforcement means improving Prestressed cored beams or boards oblique section bearing capacity |
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