CN112681155B - Assembled steel-UHPC combined reinforcement structure for improving shear bearing capacity of hollow slab beam and construction method thereof - Google Patents
Assembled steel-UHPC combined reinforcement structure for improving shear bearing capacity of hollow slab beam and construction method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of bridge reinforcement, and particularly relates to an assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of a hollow plate girder, which comprises a steel-UHPC combined box girder, wherein the steel-UHPC combined box girder comprises a closed steel box, grouting holes are formed in the closed steel box, a UHPC box body is poured in the closed steel box through the grouting holes, and the assembled steel-UHPC combined box girder is anchored with a part to be reinforced of the hollow plate girder through a self-locking bolt to realize the joint work with an original structure so as to improve the shear bearing capacity of the hollow plate girder. The assembled steel-UHPC combined box girder has the advantages of low material and manufacturing cost, remarkable shearing bearing capacity improvement, no bridge deck part involved in the operation of the lower part of the hollow plate girder in the whole reinforcement construction, no influence on bridge deck traffic, convenience and rapidness, and remarkable economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of bridge reinforcement, and particularly relates to an assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of a hollow slab beam and a construction method thereof.
Background
Along with the rapid development of the construction capability of national economy and traffic infrastructure in China, the bridge construction level reaches a totally new height. According to the related data, 10 months in 2019 are cut through, and 100 thousands of established bridges are broken through in China. Wherein, the bridge with medium and small span accounts for more than 90 percent. The hollow slab beams in the middle-and-small-span bridges are used in a large quantity, and particularly in the middle-and-small-span bridges with the spans of less than 20m, the majority of the section forms are the hollow slab beams.
Along with the rapid development of traffic construction, traffic flow and vehicle load are also increasing. Under the conditions of large traffic and heavy load operation, the existing bridge structure is facing huge pressure. Meanwhile, some bridge diseases caused by improper operation and maintenance are increasingly remarkable, and particularly in the hollow slab girder bridge which is most widely used, the diseases are more serious. In the hollow slab girder bridge, cracks and hairpin joint breakage are the most representative and common two diseases, and the diseases damage the normal use performance of the bridge and even directly damage the life and property safety of people.
As one of the crack defects that is more difficult to treat, the oblique section crack is caused by insufficient shear bearing capacity of the hollow slab beam. Aiming at the problem of insufficient shear bearing capacity of the hollow plate beams, common structural shear bearing capacity reinforcing technologies such as a cross section increasing reinforcing method, an external prestress reinforcing method, a steel plate pasting method, a carbon fiber cloth pasting reinforcing technology and the like are not applicable, because the shear resistance reinforcing needs to increase the cross section of the side surfaces of the hollow plate beams or add materials, all the hollow plate beams are closely connected, especially the middle plate of the hollow plate beams cannot provide an operation space necessary for reinforcing, and the hollow plate beams with insufficient shear bearing capacity always face the fortune of demolishing and reconstruction, so that the economic and social benefits are lost greatly.
If such a bridge is not effectively reinforced and reformed, the bridge cannot be put into normal use. Even collapse damage can be caused when the oblique section crack of the hollow slab girder bridge is serious, so that development of a simplified, economical, efficient and practical hollow slab girder shear-resistant bearing capacity reinforcing technology is needed in engineering application.
Disclosure of Invention
The invention aims to solve the problem of insufficient shear bearing capacity of the existing hollow slab bridge, and provides a shear bearing capacity reinforcing structure of a hollow slab beam, which can be constructed at the bottom of the hollow slab beam, does not interrupt traffic, is quick and efficient and has good reinforcing effect.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the assembled steel-UHPC combined reinforcement structure comprises a steel-UHPC combined box girder, wherein the steel-UHPC combined box girder comprises a closed steel box, grouting holes are formed in the closed steel box, and a UHPC box body is poured in the closed steel box through the grouting holes.
The Ultra-high performance concrete is UHPC (Ultra-High Performance Concrete) for short, and the compressive strength of the Ultra-high performance concrete under standard curing is more than 120MPa.
Preferably, the closed steel box comprises a top steel plate which is longitudinally arranged, a U-shaped cold-formed thin-wall steel plate is longitudinally arranged on the top steel plate, and a transverse end-capped steel plate is arranged at the connecting end part of the top steel plate and the U-shaped cold-formed thin-wall steel plate; the grouting holes are square grouting holes, three grouting holes are formed, and the grouting holes are uniformly distributed on the top steel plate; a plurality of anchor holes are uniformly formed in the top steel plate.
Preferably, the longitudinal section height of the steel-UHPC combined box girder from the midpoint to the near mid-span end is gradually reduced in the length direction.
Preferably, the steel-UHPC combined box girder is fixedly arranged right below the web plate of the cross section of the hollow plate girder by using self-locking bolts.
Preferably, the steel-UHPC combined box girder is provided with opposite-pull steel bars.
Preferably, the UHPC box body is formed by prefabricating and pouring ultra-high-performance steel fiber concrete, and the preparation method comprises the following steps:
(1) Processing a closed steel box: manufacturing a longitudinal top steel plate, and arranging grouting holes and anchoring holes on the surface of the longitudinal top steel plate, wherein the grouting holes and the anchoring holes are uniformly distributed along the length of the top steel plate; manufacturing a U-shaped cold-formed thin-walled steel plate, and welding opposite-pull steel bars on the inner side of the U-shaped cold-formed thin-walled steel plate; manufacturing a transverse end-capped steel plate; assembling and welding a longitudinal top steel plate, a U-shaped cold-formed thin-wall steel plate and a transverse end-capped steel plate;
(2) Pouring the UHPC box: and filling ultra-high performance steel fiber concrete into the welded closed steel box through the grouting holes.
The invention also discloses a construction method of the assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of the hollow slab beam, which comprises the following steps:
(1) Erecting a scaffold: scaffold which does not obstruct passage is erected at bridge bottom:
(2) Surface cleaning: polishing two sides of the bottom surface of the hollow plate girder to remove residual sundries;
(3) Drilling an anchor hole: directly under the beam rib of the hollow slab beam, vertically and alternately drilling anchor holes from bottom to top by using a drill bit, drilling the anchor holes according to the anchor holes preset on the steel plate on the top of the steel-UHPC combined box beam, wherein the longitudinal distance of the anchor holes is 20cm, the depth is 15 cm, and cleaning the inner wall of the anchor holes by using a brush or high-pressure air after the anchor holes are drilled;
(4) And (3) bonding and fixing the self-locking bolt: cleaning the inner wall of an anchoring hole drilled on a hollow slab beam, smearing inorganic adhesive on the inner wall of the anchoring hole, embedding a self-locking bolt into the anchoring hole, and standing until the inorganic adhesive is adhered;
(5) Installing a steel-UHPC combined box girder: aligning the anchor holes on the steel-UHPC combined box girder with the self-locking bolts one by one and screwing the nuts;
(6) And (5) removing the scaffold.
Preferably, the anchor holes drilled on the hollow plate girder should avoid the longitudinal main ribs in the hollow plate girder.
Preferably, the inorganic binder is a magnesium oxychloride binder.
Preferably, the diameter of the self-locking bolt is not smaller than 10mm, the self-locking bolt comprises a screwing head, a screw rod and a nut, the screw rod is vertically arranged below the screwing head, and a locking groove is formed in the side face of the screw rod.
Advantageous effects
The invention discloses an assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of a hollow slab beam, in the invention, the shear bearing capacity improvement of the hollow slab beam is completed by drilling and fixing a steel-UHPC combined box beam, the new reinforcement part is anchored with a hollow slab by a self-anchored bolt to realize the joint work with the original structure, the reinforcement material adopts the traditional material, the cost is low, the calculation theory is simple, the whole reinforcement construction is operated at the lower part of the hollow slab beam, the bridge deck part is not involved, the bridge deck traffic is not affected at all, the convenience and the rapidness are realized, and the economic benefit and the social benefit are obvious. The beneficial effects of the invention are as follows:
(1) The steel-UHPC combined box girder and the hollow plate girder are well combined by embedding the self-locking bolts in the drilled holes and injecting the inorganic adhesive, and the shearing bearing capacity is increased by increasing the cross section area, so that the method is a reinforcing method convenient to operate.
(2) Through the mode of boring the anchor hole in hollow slab beam bottom, there is not influence to bridge deck pavement and bridge deck traffic, can not interrupt traffic in whole reinforcement process, and is high-efficient, can guarantee the normal use of hollow slab beam.
(3) The method can replace the traditional reinforcing mode of dismantling the side plates, and can realize the rapid reinforcing of the shear bearing capacity of the hollow plate girder in a short time.
Drawings
Fig. 1: the steel-UHPC combined box girder provided by the embodiment 1 of the invention has a schematic front view structure;
fig. 2: A-A section structure schematic diagram of the steel-UHPC combined box girder shown in FIG. 1;
fig. 3: the steel-UHPC combined box girder of the embodiment 1 of the invention has a schematic view of the structure;
fig. 4: the left-view structural schematic diagram of the steel-UHPC combined box girder disclosed by the embodiment 1 of the invention;
fig. 5: the steel-UHPC combined box girder provided by the embodiment 2 of the invention is installed on a longitudinal structural schematic diagram of a hollow slab girder;
fig. 6: the steel-UHPC combined box girder provided by the embodiment 2 of the invention is A-A section structure schematic diagram arranged on a hollow slab girder;
fig. 7: the steel-UHPC combined box girder disclosed by the embodiment 2 of the invention adopts a self-locking bolt connection structure schematic diagram;
fig. 8: the load-displacement relation curve after the reinforcement of the hollow slab beam and the load-displacement relation curve before the reinforcement are compared with each other;
in the figure, 1: closed steel box, 2: UHPC box, 3: top steel plate, 4: u-shaped cold-formed thin-walled steel plate, 5: transverse end-capped steel plate, 6: grouting holes; 7: an anchor hole; 8: opposite-pulling steel bars; 9: a self-locking bolt; 10: an inorganic binder; 11: a hollow slab beam; 12: steel-UHPC combined box girder; 13: and (3) a nut.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description, it is to be understood that the terms used in this specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description set forth herein is merely a preferred example for the purpose of illustration and is not intended to limit the scope of the invention, so that it should be understood that other equivalents or modifications may be made thereto without departing from the spirit and scope of the invention.
The following examples are merely illustrative of embodiments of the present invention and are not intended to limit the invention in any way, and those skilled in the art will appreciate that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
Example 1
As shown in fig. 1-4, an assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of a hollow slab beam comprises a steel-UHPC combined box beam, wherein the steel-UHPC combined box beam comprises a closed steel box 1, grouting holes 6 are formed in the closed steel box, and a UHPC box body 2 is poured in the closed steel box through the grouting holes.
The Ultra-high performance concrete is UHPC (Ultra-High Performance Concrete) for short, and the compressive strength of the Ultra-high performance concrete under standard curing is more than 120MPa.
As shown in fig. 1, the closed steel box comprises a top steel plate 3 which is longitudinally arranged, a U-shaped cold-formed thin-wall steel plate 4 is longitudinally arranged on the top steel plate, and a transverse end-capped steel plate 5 is arranged at the connecting end part of the top steel plate and the U-shaped cold-formed thin-wall steel plate; as shown in fig. 3, the grouting holes 6 are square grouting holes, three grouting holes are distributed on the top steel plate uniformly; a plurality of anchor holes 7 are uniformly formed in the top steel plate.
As shown in FIG. 1, the height of the longitudinal section from the midpoint to the right end in the length direction of the steel-UHPC combined box girder is gradually reduced from 20cm to 5cm.
The steel-UHPC combined box girder is fixedly arranged right below the web plate of the cross section of the hollow plate girder by self-locking bolts, the transverse width of the combined box girder is 10cm, the height is 20cm, and the length is 4m.
The steel-UHPC combined box girder is provided with a counter-pulling steel bar 8, the position of the combined box girder, which is 10cm in height, is provided with a counter-pulling steel bar with the diameter of 12mm and is used for connecting a web plate of the hollow slab girder, the distance between two adjacent counter-pulling steel bars is 20cm, and the position, which is 10cm away from a closed position, is provided with a first counter-pulling steel bar. In the variable cross-section area, no opposite-pulling steel bars are arranged at the position, with the longitudinal section height being smaller than 14cm, and opposite-pulling steel bars with the diameter of 12cm are arranged at the position, with the longitudinal section height being half of the longitudinal section height, of the area being larger than 14 cm.
The UHPC box body is formed by prefabricating and pouring ultra-high-performance steel fiber concrete, and the preparation method comprises the following steps:
(1) Processing a closed steel box: manufacturing a longitudinal top steel plate, wherein the size of the longitudinal top steel plate is as follows: the length is 4m, the width is 10cm, the thickness is 2cm, grouting holes and anchoring holes are formed in the surface of the steel plate, and the grouting holes and the anchoring holes are uniformly distributed along the length of the top steel plate; manufacturing a U-shaped cold-formed thin-walled steel plate, and welding opposite-pull steel bars on the inner side of the U-shaped cold-formed thin-walled steel plate; manufacturing a transverse end-capped steel plate; assembling and welding a longitudinal top steel plate, a U-shaped cold-formed thin-wall steel plate and a transverse end-capped steel plate;
(2) Pouring the UHPC box: and filling ultra-high performance steel fiber concrete into the welded closed steel box through the grouting holes.
The steel-UHPC combined box girder has the advantages of simple structure, low material and manufacturing cost, convenient and quick construction, and the reinforcing construction of the steel-UHPC combined box girder is only needed to be operated at the lower part of the hollow slab girder, the bridge deck part is not involved, the bridge deck traffic is not affected at all, the convenience and the rapidness are realized, and the economic benefit and the social benefit are obvious.
Example 2
As shown in fig. 5-7, the construction method of the assembled steel-UHPC composite reinforced structure for improving the shear bearing capacity of the hollow slab beam according to the above embodiment 1 includes the following steps:
(1) Erecting a scaffold: scaffold which does not obstruct passage is erected at bridge bottom:
(2) Surface cleaning: polishing two sides of the bottom surface of the hollow plate girder to remove residual sundries;
(3) Drilling an anchor hole: directly under the beam rib of the hollow slab beam, vertically and alternately drilling anchor holes from bottom to top by using a drill bit, drilling the anchor holes according to the anchor holes preset on the steel plate on the top of the steel-UHPC combined box beam, wherein the longitudinal distance of the anchor holes is 20cm, the depth is 15 cm, and cleaning the inner wall of the anchor holes by using a brush or high-pressure air after the anchor holes are drilled;
(4) And (3) bonding and fixing the self-locking bolt: cleaning the inner wall of an anchoring hole drilled on a hollow slab beam, smearing inorganic adhesive on the inner wall of the anchoring hole, embedding a self-locking bolt into the anchoring hole, and standing until the inorganic adhesive is adhered;
(5) Installing a steel-UHPC combined box girder: aligning the anchor holes on the steel-UHPC combined box girder with the self-locking bolts one by one and screwing the nuts;
(6) And (5) removing the scaffold.
The anchor holes drilled on the hollow plate beam should avoid the longitudinal main ribs in the hollow plate beam. The inorganic binder is a magnesium oxychloride binder. The diameter of the self-locking bolt is not smaller than 10mm, the self-locking bolt comprises a screwing head, a screw rod and a nut 13, the screw rod is vertically arranged below the screwing head, and a locking groove is formed in the side face of the screw rod.
The construction method of the assembled steel-UHPC combined reinforcement structure for improving the shear bearing capacity of the hollow plate girder can be used for constructing the bottom of the hollow plate girder, traffic is not interrupted, and the method is rapid, efficient and good in reinforcement effect.
The shear-resistant bearing capacity of the hollow plate beam is improved by drilling and fixing the steel-UHPC combined box beam, the new reinforcing part is anchored with the hollow plate by the self-anchored bolts, the reinforcing material adopts the traditional material, the cost is low, the calculation theory is simple, the whole reinforcing construction is operated at the lower part of the hollow plate beam, the bridge deck part is not involved, the bridge deck traffic is not affected, the method is convenient and quick, and the economic benefit and the social benefit are remarkable.
Example 3
Some highways have been operated for more than 20 years and are currently facing reconstruction and expansion problems. Through inspection and evaluation, the design shearing bearing capacity of the hollow slab bridge on the expressway can not meet the design standard load requirement of the existing highway bridge, and engineering is urgent to adopt an efficient and practical reinforcement mode to improve the shearing bearing capacity of the hollow slab bridge.
The total width of the single plate of the original bridge hollow slab beam is 1m, the height is 82cm, the thickness of the web plate is 19.5cm, the thickness of the top and bottom plates is 8cm, and the web plate is provided with double-limb stirrups with the longitudinal distance of 10cm and the diameter of 8 mm. When the assembled steel-UHPC combined reinforcement structure is adopted to improve the shear bearing capacity of the hollow plate girder, the data comparison of the load-displacement relation curve after the hollow plate girder is reinforced and the load-displacement relation curve before the hollow plate girder is reinforced is shown in a table 1, and the curve comparison is drawn in a graph 8.
TABLE 1 data sheet for load-displacement curve before and after reinforcing hollow slab beam
As can be seen from the data comparison analysis in FIG. 8 and Table 1, after the scheme of the invention is adopted for reinforcement, the ultimate shear bearing capacity of the hollow slab beam is improved from 455.1kN before reinforcement to 586.9kN after reinforcement, and the ultimate shear bearing capacity of the hollow slab beam is improved by 28.9% compared with that of the hollow slab beam before reinforcement, so that the on-site construction flow is simplified while the shear bearing capacity of the hollow slab beam is remarkably improved, the reinforcement period is shortened, and good technical and economic benefits are generated.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (7)
1. The reinforcing method for improving the shear bearing capacity of the hollow slab beam is characterized by utilizing an assembled steel-UHPC combined reinforcing structure for reinforcing construction, wherein the assembled steel-UHPC combined reinforcing structure comprises a steel-UHPC combined box beam, the steel-UHPC combined box beam comprises a closed steel box, grouting holes are formed in the closed steel box, and a UHPC box body is poured in the closed steel box through the grouting holes;
the method comprises the following steps:
(1) Erecting a scaffold: the bridge bottom is erected with a scaffold which does not obstruct the passing;
(2) Surface cleaning: polishing two sides of the bottom surface of the hollow plate girder to remove residual sundries;
(3) Drilling an anchor hole: directly under the beam rib of the hollow slab beam, vertically and alternately drilling anchor holes from bottom to top by using a drill bit, drilling the anchor holes according to the anchor holes preset on the steel plate on the top of the steel-UHPC combined box beam, and cleaning the inner walls of the anchor holes after the anchor holes are drilled;
(4) And (3) bonding and fixing the self-locking bolt: cleaning the inner wall of an anchoring hole drilled on a hollow slab beam, smearing inorganic adhesive on the inner wall of the anchoring hole, embedding a self-locking bolt into the anchoring hole, and standing until the inorganic adhesive is adhered;
(5) Installing a steel-UHPC combined box girder: aligning the anchor holes on the steel-UHPC combined box girder with the self-locking bolts one by one and screwing the nuts; the steel-UHPC combined box girder is fixedly arranged right below the web plate of the cross section of the hollow plate girder by using a self-locking bolt;
dismantling the scaffold;
the closed steel box comprises a top steel plate which is longitudinally arranged, a U-shaped cold-formed thin-walled steel plate is longitudinally arranged on the top steel plate, transverse end-capped steel plates are arranged at the connecting end parts of the top steel plate and the U-shaped cold-formed thin-walled steel plate, grouting holes are uniformly distributed on the top steel plate, and a plurality of anchoring holes are uniformly formed in the top steel plate; the height of the longitudinal section of the steel-UHPC combined box girder from the midpoint to one end near the midspan gradually becomes smaller.
2. The reinforcement method for improving the shear capacity of the hollow slab beam according to claim 1, wherein the steel-UHPC combined box beam is provided with opposite-pulling steel bars.
3. The method for reinforcing a hollow slab beam to improve the shear capacity according to claim 1, wherein the steel-UHPC composite box beam has a transverse width of 10cm and a height of 20cm.
4. The reinforcement method for improving the shear bearing capacity of the hollow slab beam according to claim 1, wherein the UHPC box body is formed by prefabricating and pouring ultra-high-performance steel fiber concrete, and the preparation method is as follows:
processing a closed steel box: manufacturing a longitudinal top steel plate, and arranging grouting holes and anchoring holes on the surface of the longitudinal top steel plate, wherein the grouting holes and the anchoring holes are uniformly distributed along the length of the top steel plate; manufacturing a U-shaped cold-formed thin-walled steel plate, and welding opposite-pull steel bars on the inner side of the U-shaped cold-formed thin-walled steel plate; manufacturing a transverse end-capped steel plate; assembling and welding a top steel plate, a U-shaped cold-formed thin-wall steel plate and a transverse end-capped steel plate;
pouring the UHPC box: and filling ultra-high performance steel fiber concrete into the welded closed steel box through the grouting holes.
5. The method for reinforcing a hollow slab beam to improve shear capacity according to claim 1, wherein the anchor holes drilled in the hollow slab beam should avoid longitudinal main ribs in the hollow slab beam.
6. The method for reinforcing a hollow slab beam according to claim 1, wherein the inorganic binder is a magnesium oxychloride binder.
7. The method for reinforcing a hollow slab beam to improve the shear capacity according to claim 1, wherein the longitudinal spacing of the anchoring holes is 20cm and the depth is 15 cm; the diameter of the self-locking bolt is not smaller than 10mm.
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